Externally driven axial double diaphragm pump

Abstract

A double diaphragm pump includes a pair of diaphragms that are driven through respective pumping and suction strokes. The diaphragms are connected together by structure that extends around the exterior of the pumping chambers through which the diaphragms pump the fluid. One of the diaphragms is disposed between a motor that powers reciprocation of the diaphragms and the other one of the diaphragms.

Description

[0001] EXTERNALLY DRIVEN AXIAL DOUBLE DIAPHRAGM PUMP

[0002] CROSS-REFERENCE TO RELATED APPLICATION(S)

[0003] This application claims the priority to U.S. Provisional Application No. 63 / 661,653 filed June 19, 2024 and entitled “EXTERNALLY DRIVEN AXIAL DOUBLE DIAPHRAGM PUMP,” the disclosure of which is hereby incorporated by reference in its entirety.

[0004] BACKGROUND

[0005] This disclosure relates to pumps. More particularly, this disclosure relates to double diaphragm pumps.

[0006] A double diaphragm pump can be used to pump various fluids, such as water, chemicals, mixtures, food products, fuels, gases, and other flowable materials. A diaphragm is a flexible membrane that can be flexed to increase and decrease the volume within a pumping chamber to pump the fluid. A double diaphragm pump includes a pair of diaphragms that reciprocate to pump the fluid. The drive of a double diaphragm pump is typically disposed between the diaphragms. The pumping chambers through which the diaphragms pump the material are on the outer sides of the pump, such that the diaphragms move away from each other during their respective pumping strokes.

[0007] SUMMARY

[0008] According to an aspect of the disclosure, a double diaphragm pump, includes a fluid section and a drive section. The fluid section includes a near diaphragm; a far diaphragm; a wall located directly between the near diaphragm and the far diaphragm; a near pumping chamber formed by the near diaphragm and the wall; and a far pumping chamber formed by the far diaphragm and the wall. The drive section includes an electric motor that outputs rotational motion on a motor axis, the electric motor including a stator and a rotor configured to rotate on the motor axis; and a drive which converts rotational motion from the electric motor to linear motion which moves the near diaphragm and the far diaphragm. The near diaphragm is disposed between the electric motor and the far diaphragm.

[0009] According to an additional or alternative aspect of the disclosure, a double diaphragm pump includes a fluid section and a drive section. The fluid section includes a pump housing; a near diaphragm clamped to the pump housing; a near yoke connected to the near diaphragm; a far diaphragm clamped to the pump housing; a far yoke connected to the near yoke and the far diaphragm; a wall located directly between the near diaphragm and the far diaphragm; a near pumping chamber f wall; and a far pumping chamber formed by the far diaphragm and the wall. The drive section includes an electric motor that outputs rotational motion on a motor axis, the electric motor including a stator and a rotor configured to rotate on the motor axis; and a drive which converts rotational motion from the electric motor to linear motion which moves the near diaphragm and the far diaphragm, the drive connected to the near yoke.

[0010] According to another additional or alternative aspect of the disclosure, a double diaphragm pump includes a fluid section and a drive section. The fluid section includes a pump housing; a near diaphragm connected to the pump housing; a far diaphragm connected to the pump housing; and a wall located directly between the near diaphragm and the far diaphragm. The near diaphragm includes a near inner backer oriented into a near pumping chamber; a near outer backer; and a near membrane between the near inner backer and the near outer backer, wherein the near membrane is keyed to the near outer backer. The far diaphragm includes a far inner backer oriented into a far pumping chamber; a far outer backer; and a far membrane between the far inner backer and the far outer backer, wherein the far membrane is keyed to the far outer backer. The near pumping chamber is formed by the near diaphragm and the wall. The far pumping chamber is formed by the far diaphragm and the wall. The drive section includes an electric motor configured to output rotational motion on a motor axis, the electric motor including a stator and a rotor configured to rotate on the motor axis; and a drive which converts rotational motion from the electric motor to linear motion which moves the near diaphragm and the far diaphragm.

[0011] According to yet another additional or alternative aspect of the disclosure, a double diaphragm pump includes a fluid section and a drive section. The fluid section includes a near diaphragm; a far diaphragm; a wall located directly between the near diaphragm and the far diaphragm; a near pumping chamber formed by the near diaphragm and the wall; and a far pumping chamber formed by the far diaphragm and the wall. The drive section includes a drive housing, the drive housing including a drive frame including a tube; an electric motor disposed in the drive housing, the electric motor configured to output rotational motion on a motor axis, the electric motor including a stator and a rotor configured to rotate on the motor axis, wherein the rotor includes a rotor hub supported by the tube; and a drive which converts rotational motion from the electric motor to linear motion which moves the near diaphragm and the far diaphragm.

[0012] According to yet another additional or alternative aspect of the disclosure, a double diaphragm pump includes a fluid section and a drive section. The fluid section includes a near diaphragm; a far diaphragm; a wall located dh the far diaphragm; a near pumping chamber formed by the near diaphragm and the wall; and a far pumping chamber formed by the far diaphragm and the wall. The drive section includes a drive housing; an electric motor disposed in the drive housing, the electric motor configured to output rotational motion on a motor axis, the electric motor including a stator and a rotor configured to rotate on the motor axis; a drive which converts rotational motion from the electric motor to linear motion which moves the near diaphragm and the far diaphragm; and a leak chamber formed in the drive housing, the leak chamber disposed vertically below the drive.

[0013] According to yet another additional or alternative aspect of the disclosure, a double diaphragm pump includes a fluid section and a drive section. The fluid section includes a pump housing; an inlet manifold mounted to the pump housing; an outlet manifold mounted to the pump housing; a near diaphragm configured to reciprocate on a pump axis; a far diaphragm configured to reciprocate on the pump axis; a wall located directly between the near diaphragm and the far diaphragm; a near pumping chamber formed by the near diaphragm and the wall; and a far pumping chamber formed by the far diaphragm and the wall. The drive section includes an electric motor that outputs rotational motion on a motor axis, the electric motor including a stator and a rotor configured to rotate on the motor axis; and a drive which converts rotational motion from the electric motor to linear motion which moves the near diaphragm and the far diaphragm. The fluid section is mountable to and dismountable from the drive section with the inlet manifold and the outlet manifold connected to the pump housing.

[0014] According to yet another additional or alternative aspect of the disclosure, a double diaphragm pump includes a fluid section and a drive section. The fluid section includes a pump housing; a near diaphragm connected to the pump housing and configured to reciprocate on a pump axis; a far diaphragm connected to the pump housing and configured to reciprocate on the pump axis; a wall located directly between the near diaphragm and the far diaphragm; a near pumping chamber formed by the near diaphragm and the wall; a far pumping chamber formed by the far diaphragm and the wall; a near inlet passage in the pump housing fluidly connected to the near pumping chamber; and a far inlet passage in the pump housing fluidly connected to the far pumping chamber, the far inlet passage axially offset from the near inlet passage along the pump axis. The drive section includes an electric motor that outputs rotational motion on a motor axis, the electric motor including a stator and a rotor configured to rotate on the motor axis; and a drive which converts rotational motion from the electric motor to linear m and the far diaphragm.

[0015] According to yet another additional or alternative aspect of the disclosure, a double diaphragm pump includes a fluid section and a drive section. The fluid section includes a pump housing; a near diaphragm configured to reciprocate on a pump axis; a far diaphragm configured to reciprocate on the pump axis; a wall located directly between the near diaphragm and the far diaphragm; a near pumping chamber formed by the near diaphragm and the wall; and a far pumping chamber formed by the far diaphragm and the wall. The drive section includes a drive housing; an electric motor that outputs rotational motion on a motor axis, the electric motor including a stator and a rotor configured to rotate on the motor axis; and a drive which converts rotational motion from the electric motor to linear motion which moves the near diaphragm and the far diaphragm. The fluid section is configured to connect to the drive section at a dynamic interface that provides the linear motion to the fluid section and a static interface that fixes the pump housing to the drive housing. The drive section is configured to support and hold the fluid section with the static interface broken by a plurality of mount supports extending from one of the drive housing and the pump housing being received in a plurality of mount receivers formed in the other one of the drive housing and the pump housing.

[0016] According to yet another additional or alternative aspect of the disclosure, a method of assembling a fluid section of a double diaphragm pump, the fluid section including a near diaphragm configured to reciprocate on a pump axis, a near yoke connected to the near diaphragm, a far diaphragm configured to reciprocate on the pump axis, a far yoke connected to the far diaphragm, a wall located directly between the near diaphragm and the far diaphragm, a near pumping chamber formed by the near diaphragm and the wall, a far pumping chamber formed by the far diaphragm and the wall, and a far cover enclosing the far diaphragm and the far yoke includes threading a jack screw through an opening in the far cover; exerting a driving force on the far yoke by the jack screw to cause the far yoke and the far diaphragm to displace towards the near diaphragm; and with the far yoke and the far diaphragm displaced towards the near diaphragm, connecting a plurality of guide rods that extend from the far yoke to the near yoke to fix the far yoke and the near yoke together.

[0017] According to yet another additional or alternative aspect of the disclosure, a double diaphragm pump includes a fluid section and a drive section. The fluid section includes a near diaphragm; a far diaphragm; a wall located directly between the near diaphragm and the far diaphragm; a near pumping chamber forme and a far pumping chamber formed by the far diaphragm and the wall. The drive section includes an electric motor that outputs rotational motion; and a drive which converts rotational motion from the electric motor to linear motion which moves the near diaphragm and the far diaphragm.

[0018] According to yet another additional or alternative aspect of the disclosure, a backer membrane for a diaphragm membrane configured to flex to pump fluid through a pumping chamber, the backer membrane comprising: a backer body having an outer edge formed around an axis; an aperture through a center of the backer body; at least one projection extending from a first side of the backer body; and at least one notch formed in the outer edge.

[0019] BRIEF DESCRIPTION OF THE DRAWINGS

[0020] FIG. 1A is an isometric view of a pump.

[0021] FIG. IB is an isometric view of the pump with a cover removed.

[0022] FIG. 2 is a cross-sectional view of the pump taken along line 2-2 in FIG. 1A.

[0023] FIG. 3 is an isometric view of a drive section of the pump.

[0024] FIG. 4 is an elevational end view of a fluid section of the pump.

[0025] FIG. 5 is an enlarged view of detail 5 in FIG. 1A.

[0026] FIG. 6 is an enlarged cross-sectional view showing mounting of a diaphragm of the pump.

[0027] FIG. 7 is an isometric view of a backer diaphragm.

[0028] FIG. 8 is a cross-sectional view of a fluid section of the pump illustrating connecting of the diaphragms.

[0029] FIG. 9A is an isometric view of a clamp ring.

[0030] FIG. 9B is an enlarged cross-sectional view of an interface between a diaphragm and a clamp ring.

[0031] FIG. 9C is an enlarged cross-sectional view of an interface between a diaphragm and a clamp ring.

[0032] FIG. 10 is an enlarged cross-sectional view of an interface between a diaphragm and a clamp ring.

[0033] FIG. 11 is a cross-sectional view taken along line 11-11 in FIG. 3.

[0034] FIG. 12 is an isometric view of a pump housing and fluid manifolds.

[0035] FIG. 12B is a cross-sectional view taken along line B-B in FIG. IB. FIG. 13A is an enlarged cross-sectional vie of a pump.

[0036] FIG. 13B is a cross-sectional view taken along line B-B in FIG. 13A.

[0037] FIG. 14 is an isometric view of a pump.

[0038] FIG. 15 is a cross-sectional view taken along line 15-15 in FIG. 14.

[0039] FIG. 16 is a side elevational view of the pump of FIG. 14.

[0040] FIG. 17 is a cross-sectional view taken along line 17-17 in FIG. 16.

[0041] DETAILED DESCRIPTION

[0042] The present disclosure concerns a double diaphragm pump configured to pump material, such as water, chemicals, mixtures, food products, fuels, gases, and other flowable material. The double diaphragm pump includes a drive section that provides a driving input to the diaphragms and a pumping section through which material is pumped. According to aspects of the disclosure, the diaphragms are connected together by structure that extends around the pumping chambers of the double diaphragm pump.

[0043] According to some aspects of the disclosure, a drive section of the pump is disposed on a single side of the pair of diaphragms. The diaphragms include a near diaphragm and a far diaphragm, with the near diaphragm disposed closer to the drive than the far diaphragm. According to some aspects of the disclosure, the near diaphragm and the far diaphragm can be connected together for simultaneous movement. In some examples, the diaphragms can be disposed coaxially for reciprocation on a common axis. The near diaphragm can be disposed directly axially between the drive and the far diaphragm.

[0044] According to some aspects of the disclosure, the pump includes a near diaphragm disposed closer to a drive section and a far diaphragm disposed further from the drive section. A wall is disposed between the near diaphragm and the far diaphragm. The near diaphragm and the wall define a near pumping chamber. The far diaphragm and the wall define a far pumping chamber. The wall can be disposed directly between the near diaphragm and the far diaphragm.

[0045] Pumps according to various aspects of the disclosure include a near yoke connected to a near diaphragm and a far yoke connected to a far diaphragm. The near yoke is connected to a drive of a drive section to receive a linear driving input from the drive. The near yoke and the far yoke are connected together for simultaneous movement to displace the near diaphragm and the far diaphragm. In various examples, the near yoke and the far yoke are connected together by one or more guide r far yoke.

[0046] Pumps according to some aspects of the disclosure include guide rods that connect a near yoke connected to a near diaphragm and a far yoke connected to a far diaphragm. The guide rods are not fully annularly supported by any bushing in various examples. In some examples, the guide rods float between the near diaphragm and the far diaphragm such that the guide rods are not supported between the near yoke and the far yoke.

[0047] In some aspects of the disclosure, the pump includes drive section having an electric motor and a drive that converts a rotational output of the electric motor to linear motion. The pump further includes a fluid section having a near diaphragm, a near yoke connected to the near diaphragm, a far diaphragm, and a far yoke connected to the far diaphragm and connected to the near yoke. The near yoke is connected to the drive to receive the linear motion from the drive. The near yoke can be connected to the drive by a shaft that extends fully axially through the drive.

[0048] In various examples, the drive can include a drive nut that is rotated by a rotor of the electric motor and a screw that is linearly displaced by rotation of the drive nut. The shaft that connects the screw to the near yoke can extend within and through the screw to connect to the near yoke.

[0049] Pumps according to some aspects of the disclosure includes a drive section including an electric motor and a drive. A drive frame supports the electric motor. The drive frame can, in various examples, extend into the electric motor to support rotation of a rotor of the electric motor. In some examples, a tube portion of the drive frame can extend into the electric motor to support rotation of the rotor.

[0050] A drive frame can support rotation of a rotor of the motor. Bearings that rotatably support the rotor can be mounted on the drive frame. According to various aspects of the disclosure, a rotor hub of the rotor that supports rotor magnetics of the rotor can extend around one or more of the bearings such that the rotor hub is disposed radially inward and radially outward of the one or more bearings. In various examples, the rotor hub interfaces with an inner race of the bearing while structure of the rotor hub radially overlaps with the bearing both radially inward and radially outward of the bearing. In some examples, the rotor hub is supported by a first bearing and a second bearing. The rotor hub can radially overlap with both the first and second bearings radially inward and radially outward of the first and second bearings. Pumps according to various examples includ that respectively pump fluid through a near pumping chamber and a far pumping chamber. The near diaphragm and the far diaphragm are mounted to a pump housing. The near diaphragm is connected to a drive that converts rotational motion from a motor to linear motion provided to the near diaphragm. The near and far diaphragms are connected together for simultaneous movement. The near diaphragm and the far diaphragm provide anti-rotation that prevents rotation of the linear displacer of the drive.

[0051] According to various examples, a diaphragm (either or both of the near and far diaphragms) includes a flexible membrane and an outer backer. The flexible membrane interfaces with the outer backer at a keyed interface. A yoke is connected to the diaphragm and configured to transmit linear motion to the diaphragm. The yoke can interface with the outer backer of the diaphragm. The yoke can be keyed to the outer backer to inhibit relative rotation between the yoke and the diaphragm. Additionally or alternatively, the membrane can be mounted to a pump housing at a keyed interface. The various keyed interfaces inhibit rotation of the membrane and thus of other linear displacing components of the pump.

[0052] According to some examples, the flexible membrane includes an inner membrane oriented into a pumping chamber and a backer membrane on an opposite side of the inner membrane from the pumping chamber. The backer membrane can provide additional support and stiffness to the inner membrane. The backer membrane can interface with the outer backer and can interface with the outer backer at a keyed interface. The backer membrane can be mounted to the pump housing at a keyed interface.

[0053] In some examples, a backer membrane of a diaphragm include a locating projection that extends into a locating aperture of an outer backer of the diaphragm. Additionally or alternatively, the backer membrane includes one or more locating notches in an outer edge of the backer membrane within which a locating pin is disposed. The locating pin can be mounted to the pump housing. The locating pin extending within the locating notch can key the backer membrane, and thus the diaphragm, to the pump housing by preventing rotation of the diaphragm relative to the pump housing.

[0054] Pumps according to various aspects of the disclosure include a locating pin that can set a stroke length of the diaphragms of the pump. A controller can cause the diaphragms to displace until a hard stop, formed by the locating pin, is encountered. In some examples, such as when the pump is a double diaphragm pump, the controller can cause the diaphragms to displace in an opposite direction until another hard stop, formed by another locating pin, is encountered. The controller can sei based on the locations of the hard stops. For example, the controller can set the stroke distance based on a number of rotations of a rotor of motor driving the diaphragms, based on a measured linear displacement, among other options.

[0055] According to various aspects of the disclosure, the stroke distance can be configurable, such as to provide different stroke lengths for different pump operations. In some examples, the one or more locating pins are removable and replaceable to change the length of the locating pin, and thus change the stroke length of the diaphragm.

[0056] Pumps according to some aspects of the disclosure, the pump includes a leak chamber disposed within a housing of the pump. The leak chamber can be formed in the drive section. The leak chamber can be formed in the drive housing within which the electric motor and drive are at least partially disposed. The leak chamber is disposed between the pumping chambers and the electric motor and is configured to capture any fluid leakage from the pumping chambers. A leak sensor is mounted to a sidewall of the leak chamber and is configured to sense the presence of leaked liquid within the leak chamber. The leak chamber can include a sloped floor that slopes downwards towards the leak sensor such that any leaking fluid tends to pool on the side of the same side of the leak chamber as the leak sensor.

[0057] In some examples, a leak aperture opens into the leak chamber to allow leaking fluid to exit from the leak chamber. The leak aperture can be formed in the same or a different sidewall of the leak chamber from the leak sensor. The leak aperture can be formed on a sidewall disposed on an opposite side of the leak chamber from the leak sensor. The leak aperture can be disposed vertically higher than the leak sensor.

[0058] Pumps according to various aspects of the disclosure include a fluid section and a drive section. The fluid section includes a near diaphragm, a far diaphragm, a wall between the near diaphragm and far diaphragm, a near pumping chamber between the near diaphragm and the wall, and a far pumping chamber between the far diaphragm and the wall. The drive section includes a motor configured to generate a rotational output and a drive configured to convert that rotational output to a linear input to the fluid section that displaces the near and far diaphragms. The fluid section is mountable to and dismountable from the drive section while the near diaphragm and the far diaphragm remain mounted to a pump housing of the fluid section. The near diaphragm and far diaphragm do not need to be dismounted or otherwise manipulated during mounting of the fluid manifold on the drive section and dismounting of the fluid section from the drive section. Pumps according to various aspects of the c drive section. The fluid section includes a near diaphragm, a far diaphragm, a wall between the near diaphragm and far diaphragm, a near pumping chamber between the near diaphragm and the wall, and a far pumping chamber between the far diaphragm and the wall. The drive section includes a motor configured to generate a rotational output and a drive configured to convert that rotational output to a linear input to the fluid section that displaces the near and far diaphragms. An inlet manifold is connected to a pump housing of the fluid section and an outlet manifold is connected to the pump housing. The fluid section is mountable to and dismountable from the drive section while the inlet manifold and the outlet manifold remain mounted to the pump housing. The inlet manifold and outlet manifold do not need to be dismounted or otherwise manipulated during mounting of the fluid manifold and dismounting of the fluid manifold. As such, all fluid connections of the fluid section can be maintained during mounting and dismounting.

[0059] Pumps according to some aspects of the disclosure include an inlet manifold that provides inflow of fluid to a near pumping chamber and a far pumping chamber. The inlet manifold includes a near inlet passage fluidly connected to the near pumping chamber and a far inlet passage fluidly connected to the far pumping chamber. The near inlet passage and the far inlet passage are axially offset relative to each other along a reciprocation axis of near and far diaphragms of the pump.

[0060] Pumps according to some aspects of the disclosure include an outlet manifold that receivers outflow of fluid to a near pumping chamber and a far pumping chamber. The outlet manifold includes a near outlet passage fluidly connected to the near pumping chamber and a far outlet passage fluidly connected to the far pumping chamber. The outlet inlet passage and the far outlet passage are axially offset relative to each other along a reciprocation axis of near and far diaphragms of the pump.

[0061] Pumps according to various aspects of the disclosure include a drive section that is configured to fully support a fluid section during formation and breaking of a static interface that statically connects the fluid section to the drive section. The fluid section can be hung on the drive section to be fully supported by the drive section while the static interface is formed, such as by insertion of fasteners, such as threaded fasteners.

[0062] Pumps according to various aspects of the disclosure include a clamp ring that holds a diaphragm onto a pump housing. The clamp ring can be formed as part of a cover structure or separately from other structure. The clamp ring clamps an outer edge of a flexible membrane of the diaphragm. According to some examples, the clamp ring can include an array of ribs that are configured to direct! while clamping the diaphragm. The array of ribs can provide improved fixation and inhibit rotation of the diaphragm relative to the pump housing. Additionally or alternatively, the clamp ring can hold a backer ring against the diaphragm. The backer ring can be disposed directly between the clamp ring and the bead of the diaphragm. In various examples, the backer ring can be deformable. For example, the backer ring can be formed from an elastomer. The backer ring can maintain clamping force on the backer ring while preventing loosening of the fasteners that hold the clamp ring to the pump housing.

[0063] Components can be considered to radially overlap when those components are disposed at common axial locations along an axis. A radial line extending from the axis will extend through each of the radially overlapping components. Components can be considered to axially overlap when those components are disposed at common radial and circumferential locations relative to an axis such that an axial line parallel to the axis extends through the axially overlapping components. Components can be considered to circumferentially overlap when aligned about the axis, such that a circle centered on the axis passes through the circumferentially overlapping components. Components can be considered to tangentially overlap when aligned tangentially about an axis, such that a tangent line to a circle centered on the axis passes through the tangentially overlapping components.

[0064] FIG. 1A is an isometric view of pump 10. FIG. IB is an isometric view of pump 10 with pump cover 22 removed to show internal components. FIGS. 1A and IB are discussed together. Pump 10 includes drive section 12, fluid section 14, and frame 16. Drive housing 18 of drive section 12 is shown. Pump housing 20, pump cover 22, inlet manifold 24, outlet manifold 26, far diaphragm 28b, far yoke 30b, guide rods 32, and guide tubes 34 of fluid section 14 are shown. Mount receiver 36 of pump housing 20 is shown. Mount support 38 of drive section 12 is shown. Inlet manifold 24 includes inlet housings 40a, 40b. Outlet manifold 26 includes outlet housings 42a, 42b.

[0065] Pump 10 is configured as a double diaphragm pump in which a pair of diaphragms are driven through respective pumping and suction strokes. Pump axis PA is shown in FIG. IB. The diaphragms of pump 10 are configured to reciprocate along the pump axis PA to pump material from inlet manifold 24 to outlet manifold 26.

[0066] The pump 10 includes a drive section 12 and a fluid section 14. Generally, the drive section 12 receives power, such as electrical power, and outputs linear reciprocating mechanical motion that drives pumping by the fluid section 14. The fluid section 14 receives the linear reciprocating motion from the d fluid is pulled through an inlet 44 of inlet manifold 24 and output through an outlet 46 of outlet manifold 26.

[0067] Drive housing 18 supports and at least partially encloses various components of the drive section 12, as further discussed herein. Frame 16 is configured to support pump 10 on a support surface, such as the ground. The drive section 12 and fluid section 14 are supported on the support surface by the frame 16. The frame 16 can be a structural support, such as a being formed by one or more pieces of metal, that contact ground and fully support the drive section 12 and the fluid section 14.

[0068] In the example shown, the frame 16 is directly connected to the drive housing 18 such that the drive section 12 is mounted to the frame 16. The fluid section 14 is directly connected to the drive section 12 such that the fluid section 14 is connected to the frame 16 via the drive section 12. The fluid section 14 is indirectly connected to the frame 16.

[0069] Pump housing 20 defines a plurality of pumping chambers through which the material is pumped between the inlet manifold 24 and the outlet manifold 26. The pump housing 20 can be formed from metal, amongst other possibilities. In the example shown, the pump housing 20 forms at least part of two different pumping chambers, as further shown herein. The pumping chambers are made to expand and decrease in volume by movement of diaphragms, respectively corresponding with suction and pumping strokes. The diaphragms move through pump cycles to pump the fluid. A pump cycle includes a suction stoke and a pumping stroke. A diaphragm advancing within a pumping chamber to decrease the volume within the chamber is a pumping stroke due to the movement of the diaphragm forcing the material from the pumping chamber, and the diaphragm retracting away from the pumping chamber to increase the volume within the pumping chamber is a suction stroke due to the movement of the diaphragm creating suction to pull liquid into the chamber. Each diagram reciprocates to alternate between suction and pumping strokes, the directional flow of the fluid managed by inlet and outlet check valves located respectively upstream and downstream from the pumping chambers.

[0070] Inlet manifold 24 is connected to pump housing 20. Flow of material into the pumping chambers is through the inlet manifold 24. In the example shown, the inlet manifold 24 includes inlet housings 40a, 40b that are fluidly connected to different pumping chambers within the pump housing 20. The inlet manifold 24 can be formed as a single piece, such as a single piece of metal, that is mountable to and dismountable from the pump housing 20. Outlet manifold 26 is connected to pump h the pumping chambers is through the outlet manifold 26. In the example shown, the outlet manifold 26 includes outlet housings 42a, 42b that are fluidly connected to different pumping chambers within the pump housing 20. The outlet manifold 26 can be formed as a single piece, such as a single piece of metal, that is mountable to and dismountable from the pump housing 20.

[0071] On each of the inlet manifold 24 and outlet manifold 26 the two check valves are staggered axially. For example, outlet housing 42a is axially closer to the drive section 12 then the outlet housing 42b. Likewise, the inlet housing 40a is axially closer to the drive section 12 than inlet housing 40b. Such staggering along the axis can create a more compact pump.

[0072] In the example shown, drain apertures 48a, 48b are formed in fluid section. Each drain aperture 48a, 48b is fluidly connected to a different pumping chamber of the pump 10. The drain apertures 48a, 48b are formed in the pump housing 20 in this example. The drain apertures 48a, 48b are disposed downstream of the locations that fluid passes through the inlet check valves. In some examples, the drain apertures 48a, 48b can be aligned with the moving valve component of the inlet check valve, such as aligned with a ball of the inlet check valve. The drain apertures 48a, 48b can receive a plug to close the drain aperture 48a, 48b. The drain apertures 48a, 48b are disposed vertically below the pumping chambers of the pump and facilitate draining of fluid from within the pumping chambers. The drain apertures 48a, 48b can allow for draining of fluid from within the pumping chambers without having to drain fluid from the outlet manifold 26 or lines connected to the outlet manifold 26 or having to drain fluid from the inlet manifold 24 or lines connected to the inlet manifold 24.

[0073] Shown in FIG. IB is far diaphragm 28b. Generally herein, “far” refers to being relatively farther away from the drive section 12 (or more specifically a motor of the drive section 12), typically in reference to a similar component that is not as far, whereas “near” refers to being closer to the drive section 12 (or more specifically the motor), typically in reference to a similar component that is not as close. A near diaphragm 28a is shown in subsequent figures on the opposite side of the pump housing 20 relative to the far diaphragm 28b. The far diaphragm 28b is held within the pump housing 20 by pump cover 22. The far diaphragm 28b is made to move to ex for fluid within a far pumping chamber by movement of the far yoke 30b. The far yoke 30b connects to the far diaphragm 28b.

[0074] Guide tubes 34 are connected to pump housing 20 in the example shown. Guide rods 32 extend through guide tubes 34. The guide rods 32 are configured to transmit linear driving force from a near yoke 30a to the far yoke 30b, thereby causing reciprocation of the diaphragms of the pump 10.

[0075] The fluid section 14 is statically connected to the drive section 12 to be structurally supported by the drive section 12. The fluid section 14 is also dynamically connected to the drive section 12 to receive the linear reciprocating motion from the drive section 12. In the example shown, the pump housing 20 is connected to the drive housing 18 to form the static connection between the fluid section 14 and the drive section 12.

[0076] In the example shown, the fluid section 14 is statically connected to the drive section 12 by an array of housing fasteners 50, which array extends around the pump axis PA. The housing fasteners 50 can be formed as threaded fasteners, such as bolts, among other options.

[0077] In the example shown, the drive section 12 is configured to support the fluid section 14 during assembly of the pump 10. In the particular example shown, the drive housing 18 includes mount supports 38 (only one of which is shown in FIGS. 1A and IB) that are configured to enter into and interface with mount receivers 36 (only one of which is shown in FIGS. 1 A and IB) of the pump housing 20. A center of gravity of the fluid section 14 is disposed vertically below the interface between the mount supports 38 and the mount receivers 36, which assists in maintaining alignment of the fluid section 14 on the drive section 12 during installation of the housing fasteners 50.

[0078] The fluid section 14 can hang on the drive section 12 by the interface between the mount supports 38 and the mount receivers 36. This allows the fluid section 14 to be fully supported by the drive section 12 during formation of the static interface that fixes the fluid section 14 to the drive section 12 via the housing fasteners 50.

[0079] In the example shown, the drive section 12 includes window 52 through the drive housing 18. The window opens to an interior of the drive housing 18. The window can assist in forming the dynamic interface between the drive section 12 and the fluid section 14 as the window 52 allows a user to visually see that interface during the formation of the dynamic interface. Such a configuration can provide for easier assembly and quicker formation of the dynamic interface. FIG. 2 is a cross-sectional view of pump 10 section 12, fluid section 14, and frame 16 of pump 10 are shown. Drive housing 18, motor 54, drive 56, drive cover 58, end cap 60, controller 62, and bearings 64a, 64b of drive section 12 are shown. Drive frame 66, including tube 68, of drive housing 18 are shown. Rotor 70 and stator 72 of motor 54 are shown. Rotor hub 74 and rotor magnetics 76 of rotor 70 are shown. Drive nut 78 and screw 80 of drive 56 are shown.

[0080] Pump housing 20, pump cover 22, far diaphragm 28b, far yoke 30b, near diaphragm 28a, near yoke 30a, far pumping chamber 82b, near pumping chamber 82a, guide tubes 34, and guide rods 32, of fluid section 14 are shown. Each of far diaphragm 28b and near diaphragm 28a include an inner backer 84, outer backer 86, and membrane 88. The membrane 88 includes a bead 90, inner membrane 92, and backer membrane 94. Each of far yoke 30b and near yoke 30a includes yoke arms 96.

[0081] Pump 10 is configured to pump material through near pumping chamber 82a and far pumping chamber 82b. The near diaphragm 28a and far diaphragm 28b are connected together for simultaneous reciprocation in the example shown. Far diaphragm 28b and near diaphragm 28a are disposed coaxially on the pump axis PA in the example shown. The far diaphragm 28b is configured to shift in axial direction ADI through a suction stroke and in axial direction AD2 through a pumping stroke. Near diaphragm 28a is configured to shift in axial direction ADI through a pumping stroke and in axial direction AD2 through a suction stroke.

[0082] In the example shown, the far diaphragm 28b is pinched to the pump housing 20 to connect the far diaphragm 28b to the pump housing 20. The far diaphragm 28b is connected to pump housing 20 by far clamp ring 98b. In the example shown, the far clamp ring 98bis formed as a portion of the pump cover 22, through it is understood that not all examples are so limited. For example, the far clamp ring 98b can be formed separately from the pump cover 22.

[0083] Far diaphragm 28b includes membrane 88 that is configured to flex to change the volume of the far pumping chamber 82b and cause the material flow through the far pumping chamber 82b. In the example shown, the membrane 88 includes inner membrane 92 that is oriented into the far pumping chamber 82b and can contact the pumped material. The membrane 88 further includes backer membrane 94, which can provide support and stiffness to the inner membrane 92.

[0084] In the example shown, the membrane 88 is pinched between an inner backer 84 and an outer backer 86. The inner backer 84 and outer backer 86 can be formed as plates, among other options. Both the inner backer 84 am and rigidity to the far diaphragm 28b which and can increase a plunging volume into the far pumping chamber 82b while allowing a ring-shaped unbacked portion of the membrane 88 to flex.

[0085] The far diaphragm 28b includes a bead 90. The bead 90 is formed as a portion of the membrane 88 of the far diaphragm 28b. The bead 90 can be a thick rim of the membrane 88 which is received within a ringed cavity of the pump housing 20 and / or far clamp ring 98b. The far clamp ring 98b, or other structure clamping the far diaphragm 28b, may likewise include a ringed cavity and / or may force the bead 90 into the ringed cavity of the pump housing 20 to clamp the far diaphragm 28b into place while allowing the far diaphragm 28b to shift axially along pump axis PA during pumping.

[0086] In the example shown, the near diaphragm 28a is pinched to the pump housing 20 to connect the near diaphragm 28a to the pump housing 20. In the example shown, the near diaphragm 28a is pinched to the pump housing 20 by near clamp ring 98a, through it is understood that not all examples are so limited.

[0087] Near diaphragm 28a includes membrane 88 that is configured to flex to change the volume of the near pumping chamber 82a and cause the material flow through the near pumping chamber 82a. In the example shown, the membrane 88 includes inner membrane 92 that is oriented into the near pumping chamber 82a and can contact the pumped material. The membrane 88 further includes outer backer 86, which can provide support and stiffness to the inner membrane 92.

[0088] In the example shown, the membrane 88 is pinched between an inner backer 84 and an outer backer 86. The inner backer 84 and outer backer 86 can be formed as plates, among other options. Both the inner backer 84 and outer backer 86 can provide stiffness and rigidity to the near diaphragm 28a which and can increase a plunging volume into the near pumping chamber 82a while allowing a ring-shaped unbacked portion of the membrane 88 to flex.

[0089] The near diaphragm 28a includes a bead 90. The bead 90 is formed as a portion of the membrane 88 of the near diaphragm 28a. The bead 90 can be a thick rim of the membrane 88 which is received within a ringed cavity of the pump housing 20 and / or near clamp ring 98a. The near clamp ring 98a, or other structure clamping the near diaphragm 28a, may likewise include a ringed cavity and / or may force the bead 90 into the ringed cavity of the pump housing 20 to clamp the near diaphragm 28a into place while allowing the near diaphragm 28a to shift axially along the pump axis PA during pumping. Pump housing 20 forms a wall 100. It is u can be formed by a different structure in various other examples. Wall 100 is disposed between the near diaphragm 28a and the far diaphragm 28b. In the example shown, the wall 100 is disposed directly axially between the near diaphragm 28a and the far diaphragm 28b. In the example shown, the wall 100 forms part of both of the far pumping chamber 82b and the near pumping chamber 82a. Both of the near diaphragm 28a and far diaphragm 28b alternately move closer and farther away from the wall 100 to alternately increase and decrease the volumes of the far pumping chamber 82b and the near pumping chamber 82a, to move through pumping cycles.

[0090] Far diaphragm 28b is connected to far yoke 30b. Far diaphragm 28b is fixed to far yoke 30b for simultaneous movement. The far yoke 30b includes yoke arms 96 that extend radially outward from a main body portion of the far yoke 30b. The yoke arms 96 are oriented horizontally in the example shown, though it is understood that not all examples are so limited. For example, the yoke arms 96 can extend vertically or can be canted to extend both horizontally and vertically. The yoke arms 96 of the far yoke 30b extend further radially outward than a radial extent of the far diaphragm 28b. The far yoke 30b is thus radially wider than the far diaphragm 28b. The far yoke 30b can be radially wider than the far pumping chamber 82b.

[0091] In the example shown, the far diaphragm 28b is connected to the far yoke 30b by a diaphragm connector 95. The diaphragm connector 95 can be formed as a threaded connector, such as a threaded shaft among other options. In some examples, the diaphragm connector 95 is directly connected to the inner backer 84 and the far yoke 30b. In some examples, the diaphragm connector 95 is directly connected to the inner backer 84, the outer backer 86, and the far yoke 30b. In some examples, the diaphragm connector 95 can be directly fixed to the inner backer 84, such as by interfaced threading, and can clamp the outer backer 86 to the membrane 88. In some additional or alternative examples, the diaphragm connector 95 can clamp the far yoke 30b to the far diaphragm 28b, such as by pressing the far yoke 30b into contact with the outer backer 86 of the far diaphragm 28b.

[0092] Near diaphragm 28a is connected to near yoke 30a. Near diaphragm 28a is fixed to near yoke 30a for simultaneous movement. The near yoke 30a includes yoke arms 96 that extend radially outward from a main body portion of the near yoke 30a. The yoke arms 96 are oriented horizontally in the examples shown, though it is understood that not all examples are so limited. For example, the yoke arms 96 can extend vertically or can be canted to extend both horizontally and vertically. The yoke arms 96 of the near yoke 30a extend further radially outward than a radial extent yoke 30a is thus radially wider than the near diaphragm 28a. The near yoke 30a can be radially wider than the near pumping chamber 82a.

[0093] In the example shown, the near diaphragm 28a is connected to the near yoke 30a by a diaphragm connector 95. The diaphragm connector 95 can be formed as a threaded connector, such as a threaded shaft among other options. In some examples, the diaphragm connector 95 is directly connected to the inner backer 84 and the near yoke 30a. In some examples, the diaphragm connector 95 is directly connected to the inner backer 84, the outer backer 86, and the near yoke 30a. In some examples, the diaphragm connector 95 can be directly fixed to the inner backer 84, such as by interfaced threading, and can clamp the outer backer 86 to the membrane 88. In some additional or alternative examples, the diaphragm connector 95 can clamp the near yoke 30a to the near diaphragm 28a, such as by pressing the near yoke 30a into contact with the outer backer 86 of the near diaphragm 28a.

[0094] Guide rods 32 extends between and connect the near yoke 30a and the far yoke 30b. The near yoke 30a and far yoke 30b are fixed together for simultaneous movement along the pump axis PA by the guide rods 32. The near yoke 30a and far yoke 30b are fixed such that the near yoke 30a and far yoke 30b do not move relative to each other but instead move together.

[0095] In the example shown, the guide rods 32 extend through guide tubes 34. The guide rods 32 reciprocate within the guide tubes 34 during reciprocation of the near diaphragm 28a and the far diaphragm 28b. In the example shown, an annular gap 102 is disposed between the exterior of the guide rod 32 and the interior surface of the guide tube 34. The annular gap 102 can be a cylindrical gap that extends fully axially through the guide tube 34. In various examples, the guide rod 32 is not structurally supported, such as by a bushing or other structure, between the near yoke 30a and the far yoke 30b. The guide rods 32 can be considered to float within the guide tubes 34.

[0096] In the example shown, rod fasteners 104, which can threaded connectors, such as bolts, among other options, connect the guide rods 32 to the near yoke 30a and far yoke 30b. The rod fasteners 104 can be threaded into the guide rods 32. Alternatively, the guide rods 32 can be threaded to nuts. In some examples, the guide rods 32 can be directly threaded into one or the other of the far yoke 30b and the near yoke 30a. The guide rods 32 rigidly connect the near yoke 30a and the far yoke 30b to each other such that movement of the near yoke 30a causes an equivalent simultaneous movement in the far yoke 30b. The guide rods 32 rigidly connect the near j for simultaneous movement. The guide rods 32 can further resist torquing of the near yoke 30a and far yoke 30b, such as rocking of the yoke arms 96 axially, to maintain alignment of the near yoke 30a and far yoke 30b on the pump axis PA. The guide rods 32 not being structurally supported within the guide tubes 34 allows for some flexing of the guide rods 32, which provides for improved operating life of the guide rods 32.

[0097] Drive section 12 provides driving force to the fluid section 14 to cause pumping by pump 10. Drive section 12 includes motor 54 that is at least partially within drive housing 18. Motor 54 can be configured as an electric motor.

[0098] The controller 62 can include electrical components for managing the any of the functions referenced herein. For example, controller 62 can include one or more processors for receiving an input, such as a command regarding pumping pressure, speed, or just to start the pump 10, and can output electrical power to an electric motor 54 which causes the drive section 12 to operate pumping of the fluid section 14. The controller 62 can include memory. The controller 62 can include one or more circuit boards with programmed chips for performing various functions. Control housing 124 within which the controller 62 is disposed is also shown.

[0099] Motor 54 includes stator 72 and rotor 70. Rotor 70 is configured to rotate on a motor axis MA. In the example shown, the motor axis MA is disposed coaxially with the pump axis PA on which the near diaphragm 28a and the far diaphragm 28b reciprocate. The stator 72 can be electrically energized such that electric current runs through one or more coils which generate electromagnetic fields. The electromagnetic fields extend across an air gap to the rotor 70. The rotor 70 can include rotor magnetics 76, which can be permanent magnets, electromagnets, or other material that can be moved by the magnetic field. The rotor magnetics 76 are mounted on a rotor hub 74 of the rotor 70. The rotor hub 74 is configured to convey rotational motion to drive 56.

[0100] In the example shown, the motor 54 is configured as an inner rotator, in which the rotor 70 is disposed radially inward of the stator 72. It is understood, however, that not all examples are so limited. For example, some configurations of pump 10 can include an outer rotating motor in which the stator 72 is disposed radially inward of the rotor 70.

[0101] Drive 56 is configured to convert the rotational output from the motor 54 into linear motion provided to the fluid section 14. In the example shown, the drive 56 is at least partially disposed within the motor 54. Portions of the drive 56 extends axially outward of the rotor 70 in both axially towards the fluid section 14 and axially away from the fluid section 14. In the example shown, portions of the rotor hub 74 in both axial directions ADI, AD2.

[0102] Motor 54 is not disposed between the near diaphragm 28a and the far diaphragm 28b. In the example shown, the motor 54 is neither directly nor indirectly between the near diaphragm 28a and the far diaphragm 28b.

[0103] In the example shown, the drive 56 includes drive nut 78 that is connected to rotor 70 to rotate with rotor 70 and a screw 80 that is displaced linearly by rotation of the drive nut 78. Drive nut 78 is rotationally fixed to the rotor 70 such that the stator 72 rotating the rotor 70 also rotates the drive nut 78. In the example shown, the drive nut 78 is mounted to a far side of the rotor hub 74 that is furthest axially away from the fluid section 14. The drive nut 78 terminates at a location within the rotor hub 74. The screw 80 extends fully axially through the rotor hub 74 such that the screw 80 can project outward of the rotor hub 74 in both axial directions ADI, AD2.

[0104] The drive nut 78 can interface directly (via threading) or indirectly (via rolling elements such as balls) with the screw 80. In some examples, the rolling elements, such as balls or elongate threaded rollers, are disposed between the drive nut 78 and the screw 80 to cause the linear displacement of the screw 80. It is understood that, while drive 56 is shown as including drive nut 78 and screw 80, drive 56 can take other forms suitable for converting rotational motion to linear reciprocating motion.

[0105] Screw 80 is configured to provide the linear reciprocating input to the fluid section 14. In the example shown, the screw 80 interfaces with the near yoke 30a. The screw 80 can directly interface with the near yoke 30a. In the example shown, the screw 80 is rotationally fixed to the near yoke 30a such that the interfacing of the screw 80 and the near yoke 30a prevents rotation of the screw 80.

[0106] In the example shown, the screw 80 includes threaded portion 106 and unthreaded portion 108. The threaded portion 106 interfaces with the drive nut 78 to receive driving force form the drive nut 78. The threaded portion 106 can interface with the drive nut 78 directly (e.g., by interfaced threading) or indirectly (e.g., by rolling elements disposed between the screw 80 and drive nut 78).

[0107] The unthreaded portion 108 extends from the threaded portion 106. The unthreaded portion 108 extends towards the fluid section 14. The unthreaded portion 108 extends towards the near yoke 30a and interfaces with the near yoke 30a. The unthreaded portion 108 extends out of the rotor hub 74 in axial direction ADI. In the example shown, the screw 80 is keyed rotation between the screw 80 and the near yoke 30a. In this particular example, locking end 110 of the screw 80 extends into a receiving chamber 112 formed in the near yoke 30a. The interfacing between the locking end 110 and the receiving chamber 112 keys the screw 80 to the near yoke 30a to prevent relative rotation between the screw 80 and the near yoke 30a.

[0108] Shaft 114 fixes the screw 80 and the near yoke 30a together to facilitate transfer of the linear reciprocating motion to the fluid section 14. The shaft 114 is connected to the near yoke 30a by interfaced threading in the example shown, though it is understood that not all examples are so limited. In the example shown, the shaft 114 is directly connected to the diaphragm connector 95 that connects the near yoke 30a to the near diaphragm 28a. The shaft 114 includes exterior threading that connects to interior threading of a portion of the diaphragm connector 95 in this example. It is understood that in various other examples the shaft 114 can directly connect to the near yoke 30a.

[0109] In some examples, the shaft 114 can extend fully axially through the screw 80 to connect to the near yoke 30a. In the example shown, the shaft 114 extends fully axially through the threaded portion 106 of the screw 80. In the example shown, the shaft extends such that a portion of the shaft 114 radially overlaps with structure of the near yoke 30a. The shaft 114 can, in some examples, radially overlap with the keying interface between the screw 80 and near yoke 30a.

[0110] The shaft 114 provides the axial connection that holds the screw 80 and near yoke 30a together for simultaneous axial displacement. The screw 80 can be clamped between a shaft head 116 of the shaft 114 and the near yoke 30a. In the example shown, the shaft 114 axially fixes the screw 80 to the near yoke 30a. The keyed interface between the screw 80 and the near yoke 30a prevents relative rotation between the screw 80 and the near yoke 30a.

[0111] The shaft 114 is configured to enter into the screw 80 from an end of the screw 80 oriented away from the fluid section 14. The shaft 114 includes a head 116 is accessible from the exterior of the drive 56. The head 116 of the shaft 114 can be configured as a hex that can be gripped by a wrench or other tool for forming or breaking the threaded interface that connects the shaft 114 to the near yoke 30a.

[0112] For assembly and disassembly of pump 10, the dynamic interface is formed by a single connection. The single connection is formed by the shaft 114. The shaft 114 can be unthreaded which breaks the dynamic interface and allows for removal of the fluid section 14 with the static interface broken. The dynamic i shaft 114 through the screw 80 and threading the shaft 114 to form the dynamic interface. The interface between the screw 80 and near yoke 30a aligns the passage though the screw 80 with the threaded receiver that the shaft 114 connects to, allowing for simple and quick forming of the dynamic interface.

[0113] As noted above, the window 52 through drive housing 18 allows the user to visually align the screw 80 and near yoke 30a to key the screw 80 and near yoke 30a together, which aligns for formation of the dynamic interface. The dynamic interface can be formed and broken by accessing the shaft 114 on an opposite axial side of the drive 56 from the fluid section 14. The shaft 114 can be accessed by simple removal of the drive cover 58.

[0114] In various examples, anti-rotation is provided by the near diaphragm 28a and the far diaphragm 28b. The near diaphragm 28a and far diaphragm 28b can prevent rotation of the near yoke 30a and far yoke 30b on the pump axis PA and can prevent rotation of the screw 80 on the motor axis MA. The screw 80 can be considered to be rotationally fixed by the near diaphragm 28a and the far diaphragm 28b.

[0115] In the example shown, the rotation resistance that prevents rotation of the screw 80 and other linear displacing components is provided by one or both of the near diaphragm 28a and the far diaphragm 28b. The near diaphragm 28a and the far diaphragm 28b are rotationally locked (e.g., by clamping to pump housing 20) such that the near diaphragm 28a and the far diaphragm 28b do not rotate on the pump axis PA relative to pump housing 20.

[0116] The far yoke 30b is connected to the far diaphragm 28b in a manner that resists relative rotation therebetween. The far yoke 30b can be keyed to the far diaphragm 28b, such as by a keyed interface between the far yoke 30b and the outer backer 86 of the far diaphragm 28b.

[0117] The near yoke 30a is connected to the near diaphragm 28a in a manner that resists relative rotation. The near yoke 30a can be keyed to the near diaphragm 28a, such as by a keyed interface between the near yoke 30a and the outer backer 86 of the near diaphragm 28a.

[0118] The near yoke 30a and the far yoke 30b are fixed together by guide rods 32. The screw 80 interfaces with the near yoke 30a at a keyed interface to resist relative rotation therebetween. The shaft 114 clamps the screw 80 to the near yoke and thus to the near diaphragm 28a via the near yoke 30a. Drive frame 66 forms a stationary componei drive section 12. The drive frame 66 can be monolithically formed with other components of drive housing 18 or can be formed separately from other components of drive housing 18. In the example shown, the drive frame 66 supports the stator 72 of the electric motor 54 and the rotor 70 of the electric motor 54.

[0119] A portion of the drive frame 66 extends radially within the motor 54. In the example shown, tube 68 of the drive frame 66 extends into the motor 54. The tube 68 is disposed radially within the rotor 70. A portion of the tube 68 radially overlaps with the rotor magnetics 76 of the rotor 70.

[0120] In the example shown, the tube 68 extends into the rotor 70 such that a portion of the rotor 70 radially overlaps with the tube 68 radially outward of the tube 68 and a portion of the rotor 70 radially overlaps with the tube 68 radially inward of the tube 68. The tube 68 is configured to remain stationary while the rotor 70 rotates at locations radially overlapping with the tube 68 both radially inside of and radially outside of the tube 68.

[0121] Bearings 64a, 64b support rotation of the rotating components of drive section 12. One or both of bearings 64a, 64b are located, at least in part, radially within the electric motor 54. In the example shown, both bearings 64a, 64b are located at least in part radially within the electric motor 54. The bearings 64a, 64b allow the rotor 70 be stabilized while rotating relative to a drive frame 66.

[0122] Bearing 64a is configured to react axial loads generated due to reciprocation during operation. Bearing 64a can react axial forces in both axial direction ADI and axial direction AD2. Bearing 64a is configured as a double row bearing in the example shown, though it is understood that not all examples are so limited. Bearing 64a can be configured as a double row angular contact bearing in various examples. Bearing 64a is disposed partially directly radially within motor 54. Bearing 64a can also be referred to as a reaction bearing.

[0123] Bearing 64a projects axially outward from the electromagnetic components of motor 54. In the example shown, a portion of bearing 64a is disposed axially between the electromagnetic components of motor 54 (e.g., coils of stator 72 and rotor magnetics 76 of rotor 70) and the fluid section 14. In the example shown, bearing 64a does not radially overlap with drive nut 78.

[0124] In the example shown, the rotating component supported by bearing 64a is disposed on a radially inner side of bearing 64a. The stationary component to which bearing 64a is directly connected is disposed on a radially outer side of bearing 64a. An inner race of bearing 64a can be mounted to rotor hub 74 and an outer race of bearing 64a can be mounted to the drive frame 66. The outer race of bearing 64a radial side of tube 68.

[0125] End cap 60 is connected to drive frame 66. Screw 80 extends through end cap 60 between drive nut 78 and near yoke 30a. End cap 60 can retain bearing 64a on rotor hub 74 and tube 68. End cap 60 can axially locate bearing 64a relative to drive frame 66.

[0126] In the example shown, the end cap 60 is configured to seal the portion of the drive housing 18 that the drive 56 is disposed within. The screw 80 extends through an inner aperture 118 of the end cap 60. Drive seal 120 is disposed between screw 80 and end cap 60 and provides a sealed interface that prevents ingress of liquid or other contaminants. The screw 80 is configured to reciprocate relative to the drive seal 120. The drive seal 120 provides a dynamic sealing interface between the moving screw 80 and the stationary end cap 60.

[0127] In the example shown, the unthreaded portion 108 extends through the inner aperture 118 and is configured to move relative to the drive seal 120. In some examples, the unthreaded portion 108 is cylindrical, though it is understood that not all examples are so limited.

[0128] In the example shown, the end cap 60 is configured to seal with a portion of the drive housing 18, such as to prevent liquid or other contaminants from flowing into tube 68, such as to bearing 64a. Outer seal 122 is disposed between a portion of end cap 60 and a portion of drive housing 18. The outer seal 122 is disposed radially outward of the drive seal 120. The outer seal 122 provides a static sealing interface between the fluid section 14 and the electrical components of drive 56.

[0129] Bearing 64b is configured to rotatably supports rotor 70. In the example shown, bearing 64b is disposed directly radially inward of the electromagnetic components of stator 72 (e.g., coils of stator 72) and bearing 64b is disposed directly radially inward of the electromagnetic components of rotor 70 (e.g., rotor magnetics 76). Bearing 64b interfaces with tube 68 and with a portion of rotor hub 74 disposed directly radially inward of the bearing 64b. Bearing 64b assists in maintaining concentricity between components on the motor axis MA. Bearing 64b can also be referred to as a support bearing.

[0130] An inner race of bearing 64b can be mounted to rotor hub 74 and an outer race of bearing 64b can be mounted to the drive frame 66. The outer race of bearing 64b can be mounted to tube 68 on an inner radial side of tube 68.

[0131] In the example shown, bearings 64a, 64b interface with the rotor hub 74. It is noted that the bearings 64a, 64b are located one or both of internal to the motor 54 and / or on one side of the electric motor 54, on the fluid section bearings 64a, 64b are not disposed on the far side of the electric motor 54 beyond the electric motor 54 in axial direction AD2 away from the fluid section 14. In other words, the bearings 64a, 64b can be located on one axial side of the electric motor 54 but are not located on the other axial side of the electric motor 54.

[0132] Drive cover 58 extends over drive 56. Drive cover 58 can provide a safety barrier and can protect the interfacing components of drive 56 from contamination.

[0133] In the example shown, the dynamic interface between drive section 12 and fluid section 14 can be disconnected without disconnecting either of the near diaphragm 28a or the far diaphragm 28b from pump housing 20. To break the dynamic interface, the drive cover 58 is removed, providing access to the shaft 114. The shaft 114 can then be disconnected from the near yoke 30a, such as by unthreading the shaft 114. Disconnecting the shaft 114 from the near yoke 30a breaks the dynamic interface.

[0134] In the example shown, the static interface between drive section 12 and fluid section 14 can be broken without disconnecting either of the near diaphragm 28a or the far diaphragm 28b from the pump housing 20. The fluid connections between inlet manifold 24 and the near pumping chamber 82a and far pumping chamber 82b and the fluid connections between outlet manifold 26 and the near pumping chamber 82a and the far pumping chamber 82b can be maintained while breaking or forming the static interface.

[0135] For example, the fluid section 14 can be dismounted from the drive section 12 by removing the housing fasteners 50 and then pulling the fluid section 14 off of the drive section 12. No internal connections, other than the dynamic interface, needs to be accessed for dismounting of the fluid section 14.

[0136] In the example shown, the fluid section 14 can be dismounted, such as for maintenance, by breaking the static interface, lifting the fluid section 14 to align the larger openings through mount receivers 36 with the mount supports 38, and then pulling fluid section 14 in axial direction ADI away from the drive section 12.

[0137] During operation, the electric motor 54 generates a rotational output by the stator 72 electromagnetically causing rotation of the rotor 70. Rotation of the rotor 70 causes rotation of the drive nut 78. Rotation of the drive nut 78 causes linear displacement of the screw 80. The linear displacement of screw 80 causes linear displacement of near yoke 30a and thus near diaphragm 28a, which due to the connection of guide rods 32 between near yoke 30a and far yoke 30b, causes linear displacement of far yoke 30b and thus far diaphragm 28b. The near diaphragm 28a moves away from near pumping chamber 82a through a suction stroke and simultaneously the far diaphragm 28b is moved towards the wall 100 to decrease the volume of far pumping chamber 82b in a pumping stroke. The electric motor 54 can reverse a rotational direction at the end of the stroke, and the screw 80 and consequently the near yoke 30a and far yoke 30b and the guide rods 32 likewise reverse their linear reciprocating direction, such that the near diaphragm 28a moves toward the wall 100 to decrease the volume of the near pumping chamber 82a through a pumping stroke and the far diaphragm 28b is moved away the wall 100 to increase the volume of the far pumping chamber 82b through a suction stroke.

[0138] The electric motor 54 can reverse rotational directions and the screw 80, the near yoke 30a, the far yoke 30b, the near diaphragm 28a, and the far diaphragm 28b reverse directions such that one diaphragm is always in a suction stroke and the other diaphragm is always in a pumping stroke, except for changeover between the strokes, and which diaphragm is in the pumping or suction stroke switches on reversal of the rotational direction of the rotor 70 of the electric motor 54.

[0139] FIG. 3 is an isometric view of drive section 12. FIG. 4 is an elevational end view of fluid section 14. FIG. 5 is an enlarged view of detail 5 in FIG. 1A. FIGS. 3-5 are discussed together. A near side of the fluid section 14 that is oriented inwards towards drive section 12 is shown in FIG. 4.

[0140] As discussed above, the fluid section 14 can be mounted to and dismounted from the drive section 12 in an assembled state. The fluid section 14 can be connected to and disconnected from the drive section 12 without breaking any fluid connections of the fluid section 14. The near diaphragm 28a and far diaphragm 28b can be maintained mounted to the pump housing 20 in a state in which the near pumping chamber 82a and the far pumping chamber 82b are sealed by the near diaphragm 28a and far diaphragm 28b during mounting and dismounting of the fluid section. The inlet manifold 24 and outlet manifold 26 can remain structurally and fluidly connected to the pump housing 20 during mounting and dismounting of the fluid section 14 from the drive section 12.

[0141] As shown in FIG. 3, the drive housing 18 includes a leak chamber 126 on a lower side of the drive housing 18. The leak chamber 126 is configured to form a reservoir that can collect any material that leaks from the near pumping chamber 82a and / or the far pumping chamber 82b. A leak sensor 128 is open into the leak chamber 126 and is configured to provide information to the controller 62 indicative of fluid leakage. As shown, drive section 12 includes a plura supports 38 extend outward from the drive section 12 away from the motor 54. Each mount support 38 includes a support head 130 and a support shaft 114.

[0142] As shown in FIG. 4, the near diaphragm 28a is clamped to the pump housing 20 by near clamp ring 98a. Near clamp ring 98a is connected to the pump housing 20 by ring fasteners 134, which can be formed as threaded fasteners, such as bolts, among other options. The ring fasteners 134 are disposed in an array around the pump axis PA. The array of ring fasteners 134 are disposed radially inward of the housing fasteners 50 that statically connect the fluid section 14 to the drive section 12.

[0143] Near yoke 30a includes receiving chamber 112, which is formed as separate chambers in this example, that are oriented axially towards the drive section 12. Screw 80 includes key projections 136 on locking end 110 that are configured to enter into the receiving chambers 112 to formed the keyed interface between the screw 80 and the near yoke 30a.

[0144] In the example shown, the screw 80 includes a plurality of key projections 136 that extend into a plurality of the receiving chambers 112 to form the keyed interface. The receiving chambers 112 and key projections 136 are disposed on opposite sides of the pump axis PA. The key projections 136 and receiving chambers 112 are disposed 180-degrees apart about the pump axis PA in this example. While the example shown includes two receiving chambers 112 and two key projections 136, it is understood that other counts are possible, such as three, four, five, or another number. In some examples, the key projection 136 can be a single non-circular projection (e.g., that extends fully about the pump axis PA) and the receiving chamber 112 can be of a corresponding non-circular shape to receive the single key projection 136.

[0145] As shown, the fluid section 14 includes a plurality of mount receivers 36. In the example shown, the fluid section 14 includes a pair of mount receivers 36 that are disposed on opposite lateral sides of the pump axis PA. The mount receivers 36 are disposed vertically above the pump axis PA. The mount receivers 36 are disposed vertically above the center of gravity of the fluid section 14. The mount receivers 36 are formed in the pump housing 20 in this example.

[0146] Each mount receiver 36 includes receiving aperture 138 and retaining aperture 140. The receiving aperture 138 is wider than the retaining aperture 140.

[0147] The fluid section 14 is configured to mount to and dismount from the drive section 12 in an assembled state. The inlet manifold 24 and outlet manifold 26 can be mounted to and remain connected to the pump housing 20 dui fluid section 14 on the drive section 12. All fluid connections can be maintained throughout mounting of the fluid section 14 and dismounting of the fluid section 14.

[0148] In the example shown, the fluid section 14 can be supported by the drive section 12 during formation of the static interface that fixes the fluid section 14 to the drive section 12. In this particular example, the fluid section 14 is mounted to the drive section 12 by aligning the mount receivers 36 with the mount supports 38. The fluid section 14 can then be shifted towards the drive section 12 (or drive section 12 towards the fluid section 14) such that the mount supports 38 pass through the mount receivers 36. In the specific example shown, the mount supports 38 pass through the receiving apertures 138 of the mount receivers 36.

[0149] With the mount supports 38 disposed through the receiving apertures 138, the fluid section 14 is vertically lowered relative to the drive section 12. The fluid section 14 can be considered to shift vertically downward. The fluid section 14 can be considered to shift radially relative to the pump axis PA. Lowering the fluid section 14 causes the support shafts 132 to enter into the retaining apertures 140 of the mount receivers 36.

[0150] In the example shown, the retaining apertures 140 are smaller than the support heads 130 of the mount supports 38. Such a configuration prevents the fluid section 14 from sliding off of the drive section 12 as the support heads 130 will instead interface with the structure defining the retaining aperture 140. With the fluid section 14 supported by the mount supports 38, openings of the fluid section 14 and openings of the drive section 12 that receive the housing fasteners 50 are aligned and the housing fasteners 50 can be installed to form the fixed static interface between fluid section 14 and drive section 12.

[0151] As discussed above, the mount supports 38 and mount receivers 36 are disposed vertically above a center of gravity of the fluid section 14. Such a configuration maintains alignment of the fastener openings of the fluid section 14 and the drive section 12 by preventing the fluid section from pivoting away from the drive section 12 while the fluid section 14 hangs from the mount supports 38.

[0152] The configuration for forming the static interface between fluid section 14 and drive section 12 provides significant advantages. The fluid section 14 can be mounted to and dismounted from the drive section 12 without breaking any fluid connections. Such a configuration eliminates the need to drain fluid lines, thereby providing a cost and material savings, while also reducing potential mess and waste. Further, the fluid connections being maintained provides for a simpler configuration for assembly and disassembly. The mount supports 38 can hold the fluid se mounting and dismounting. As such, the user does not need to separately support the fluid section 14 relative to the drive section 12 to form or break the static interface. The user can hang the fluid section 14 on the drive section 12 and then, while the fluid section 14 is being supported by the drive section 12, form the static interface. For example, the user can hang the fluid section 14 on the drive section 12 and then install the housing fasteners 50 to form the static interface.

[0153] FIG. 6 is an enlarged cross-sectional view showing mounting of a diaphragm 28 of the pump 10. FIG. 7 is an isometric view of a backer membrane 94. FIGS. 6 and 7 are discussed together. The diaphragm 28 shown can be representative of either of the near diaphragm 28a and / or the far diaphragm 28b. The yoke 30 shown can be representative of either of the near yoke 30a and / or the far yoke 30b. The clamp ring 98 shown can be representative of either of the near clamp ring 98a and / or the far clamp ring 98b. While clamp ring 98 is shown as formed separate from a cover or other structure, it is understood that the clamp ring 98 can be integrated into a cover or other structure, such as to form the far clamp ring 98b.

[0154] The diaphragm 28 includes inner backer 84, outer backer 86, and membrane 88. Membrane 88 includes inner membrane 92 and backer membrane 94. Backer membrane 94 includes backer body 142, outer edge 144, ears 145, locating projections 146, and locating notches 148. Outer backer 86 includes locating apertures 150. Yoke 30 is connected to diaphragm 28 to move with diaphragm 28. Yoke 30 includes yoke arms 96, yoke body 152, receiving chamber 112, and yoke projections 154.

[0155] Diaphragm 28 is clamped to pump housing 20 to secure the diaphragm 28 to pump housing 20. In the example shown, the diaphragm 28 includes a bead 90 that is clamped within a receiving cavity 156. The receiving cavity 156 is partially formed in the pump housing 20 and partially formed in the clamp ring 98 in this example.

[0156] The membrane 88 is configured to flex as the diaphragm 28 reciprocates to pump the material through the pumping chamber 82, which pumping chamber 82 can be representative of either of the near pumping chamber 82a and / or the far pumping chamber 82b. The membrane 88 is clamped between the pump housing 20 and the clamp ring 98 at an outer radial edge of the membrane 88. The clamp ring 98 can be formed as the near clamp ring 98a or the far clamp ring 98b. The membrane 88 is further clamped between the inner backer 84 and the outer backer 86. A portion of the membrane 88 extending radially outward from the portion between the inne portion clamped to the pump housing 20 is configured to flex during pump operations.

[0157] Membrane 88 includes inner membrane 92 that is oriented into the pumping chamber 82. The inner membrane 92 can directly contact the pumped material during operation. The membrane 88 further includes backer membrane 94 that is on an opposite side of the inner membrane 92 from the pumping chamber 82. The backer membrane 94 can provide support to the inner membrane 92. The backer membrane 94 can further provide structural support that provides the anti-rotation interface for preventing rotation of the screw 80 and yoke 30 during pump operation. It is understood that while in this particular example the backer membrane 94 is described as providing such anti-rotation, the membrane 88 can provide the anti-rotation regardless of whether the membrane 88 is formed from multiple components or as a single component.

[0158] Membrane 88 is clamped between inner backer 84 and outer backer 86. While inner backer 84 and outer backer 86 are shown as disposed outside of and separable from membrane 88, it is understood that not all examples are so limited. For example, membrane 88 can be overmolded onto one or the other or both of the outer backer 86 and inner backer 84 such that the overmolded component is integral with the membrane 88.

[0159] Diaphragm connector 95 clamps the membrane 88 between inner backer 84 and outer backer 86. In the example shown, diaphragm connector 95 further clamps the yoke 30 to the diaphragm 28 to connect the yoke 30 to the diaphragm 28. More specifically, the diaphragm connector 95 clamps the yoke 30 to the outer backer 86.

[0160] In the example shown, the diaphragm connector 95 includes connector shaft 158, nut 160, and connector tube 162. The connector shaft 158 extends through the outer backer 86 and the membrane 88 and is directly connected to the inner backer 84. The connector shaft 158 can be connected to the inner backer 84 by interfaced threading, among other options.

[0161] The membrane 88 is clamped between the inner backer 84 and the outer backer 86. In the example shown, nut 160 clamps the outer backer 86 and the membrane 88 onto the inner backer 84. For example, the nut 160 can be threaded onto a threaded version of connector shaft 158 to exert the clamping force.

[0162] In the example shown, the yoke 30 is clamped to the diaphragm 28 by diaphragm connector 95. In this particular example, the connector tube 162 connects to the connector shaft 158 and interfaces with the yoke 30 to clamp the yoke 30 to the diaphragm 28. The yoke 30 is clamped directly against the outer backer 86 in this example. In the example shown, the connector tube 1 connector shaft 158 includes exterior threading such that the connector tube 162 can thread onto the connector shaft 158. The connector tube 162 can be open on both axial ends of the connector tube 162. The connector tube 162 can provide an interface for the shaft 114 to connect to the yoke 30 to thereby connect the yoke 30 to the drive 56.

[0163] The outer backer 86 is keyed to the membrane 88 in this example. More specifically, the outer backer 86 is keyed to the backer membrane 94. Keying the outer backer 86 to the membrane 88 locates the outer backer 86 in a set position about the pump axis PA. In this example, the outer backer 86 includes one or more locating apertures 150. The locating aperture 150 receives the locating projection 146 that extends from the membrane 88 to form a keyed interface between the outer backer 86 and the membrane 88.

[0164] The backer body 142 extends around an axis through the central aperture 143 formed in the backer body 142. The central aperture 143 provides an opening through which a connector can extend (e.g., a portion of diaphragm connector 95) to connect the backer membrane 94 to other components.

[0165] In the example shown, the backer membrane 94 includes a plurality of locating projections 146 that extend into a plurality of locating apertures 150, though it is understood that not all examples are so limited. For example, the backer membrane 94 can include a single locating projection 146 that extends into a single locating aperture 150, or the backer membrane 94 can include more than two locating projections 146 that extend into more than two locating apertures 150.

[0166] The yoke 30 is keyed to the diaphragm 28 to prevent rotation of the yoke 30 relative to the diaphragm 28. In the example shown, the yoke 30 is keyed to the outer backer 86. Keying the yoke 30 to the outer backer 86 locates the yoke 30 in a set position about the pump axis PA relative to the diaphragm 28. In the example shown, the yoke 30 is keyed to the outer backer 86 by yoke projections 154 extending into the locating apertures 150 of the outer backer 86.

[0167] In some examples, the yoke 30 and the backer membrane 94 extend into common locating apertures 150 to key to the outer backer 86 at the same locating apertures 150. As such, one or more, up to all, of the locating apertures 150 can extend fully axially through the outer backer 86.

[0168] The diaphragm 28 is connected to the pump housing 20 at a keyed interface that resists rotation of the diaphragm 28 about the pump axis PA relative to the pump housing 20. In the example shown, the diaphragm 28 inclm notches 148 are formed at the outer edge 144 of the backer membrane 94 in this example.

[0169] In the example shown, the backer membrane 94 includes ears 145 that project outward relative to other portions of the outer edge 144. The locating notches 148 are formed in the ears 145 in this example. It is understood that, in various other examples, the locating notches 148 can extend inward of the outer edge 144. The backer membrane 94 includes a pair of ears 145 in this example. The ears 145 are formed on opposite sides of the backer membrane 94. The ears 145 are disposed 180-degrees apart in this example, though it is understood that not all examples are so limited. While backer membrane 94 is shown as including a pair of ears 145, and thus a pair of locating notches 148, it is understood that various other examples of backer membrane 94 can include other numbers of ears 145 and locating notches 148.

[0170] In the example shown, the locating notches 148 are open radially outward away from the central aperture 143 through the backer body 142. It is understood, however, that in various examples the locating notches 148 can be closed radially outward and radially inward such that the locating notches 148 are formed as apertures through the backer membrane 94.

[0171] Locating pins 163 are at least partially disposed within the locating notches 148. The locating pins 163 can project through the locating notches 148. The locating pins 163 can be directly connected to the pump housing 20, such as by interfaced threading, an interference fit, among other options. The locating pins 163 circumferentially overlap with material of the outer backer 86 by being disposed in the locating notches 148. The locating pins 163 being disposed in the locating notches 148 prevents rotation of the membrane 88 on the pump axis PA.

[0172] In the example shown, the membrane 88 includes a pair of locating notches 148 and a pair of locating pins 163 interface with the locating notches 148. The locating notches 148 and locating pins 163 are disposed on opposite sides of the pump axis PA. The locating pins 163 and locating notches 148 can be disposed 180-degrees apart about the pump axis PA. The locating pins 163 and locating notches 148 are evenly spaced about the pump axis PA in this example. While a pair of locating notches 148 and a pair of locating pins 163 are shown, it is understood that not all examples are so limited. For examples, a single locating pin 163 interfacing with a single locating notch 148 can provide anti-rotation in some examples. Some examples can include more the two locating pins 163 interfacing with more than two locating notches 148, such as three, four, five or more. The locating pins 163 are fixed to the pump extend within the clamp ring 98. The locating pins 163 can extend fully axially through the clamp ring 98 in various examples. In some examples, the locating pins 163 can project axially outward from the clamp ring 98 towards the yoke 30 of the diaphragm 28 held by the clamp ring 98.

[0173] In some examples, the locating pins 163 can be utilized to set a stroke length of the diaphragm 28 during operation of the pump 10. It is understood that such stroke length setting can be utilized for operation of a single diaphragm pump or a double diaphragm pump.

[0174] For example, the pump 10 can be operated in a pumping mode and a start up mode. In some examples, the pump 10 can operate in the start up mode whenever the pump 10 is powered ON after being depowered (e.g., turned ON after being turned OFF). In some examples, the pump 10 can operate in the start up mode on an initial operation of the pump 10 (e.g., the first time the pump 10 is operated) and then save the stroke length information to be utilized whenever the pump 10 is repowered. In some examples, the user can place the pump 10 in the start up mode to set the stroke length. For example, the user can actuate a switch to cause the pump 10 to operate in the start up mode.

[0175] In the pumping mode, the electric motor 54 rotates to cause the one or more diaphragms 28 to reciprocate along the pump axis PA. The controller 62 can control operation of the motor 54 such that the rotor 70 rotates a set number of rotations (which can be a partial rotation) to drive the diaphragms 28 in a first direction along the pump axis PA and then the rotor 70 rotates in a second rotational direction opposite the first rotational direction to drive the diaphragms 28 in a second direction along the pump axis PA opposite the first direction along the pump axis PA.

[0176] In the start up mode, the controller 62 can cause the electric motor 54 to drive the diaphragms 28 in a first direction along the pump axis PA until a hard stop is encountered. The controller 62 can then cause the electric motor 54 to drive the diaphragms 28 in a second direction along the pump axis PA until another hard stop is encountered. The controller 62 can set the stroke length utilized while in the pumping mode based on the hard stops. For example, the controller 62 can determine the stroke length required to reach the hard stop and / or between the hard stops and set the stroke length for pumping as a fraction, up to all, of that stroke length to reach the hard stop (e.g., 95% of hard stop stroke, 90% of hard stop stroke, etc.). The controller 62 can set the stroke length for pumping based on a number of rotations of the rotor 70 to reach the hs displacement distance, among other options.

[0177] In the example shown, the locating pins 163 can provide the hard stop that stops the diaphragm 28 moving through a pumping stroke. The locating pin 163 axially overlaps with the yoke 30 along the pump axis PA. The yoke 30 encountering the locating pins 163 can provide the hard stop that prevents further displacement into the pump housing 20.

[0178] In various examples, the locating pins 163 can be accessed and replaced with locating pins 163 of a different length. Such removal and replacement provides for a configurable pump 10 that can be configured to provide any desired stroke length for pumping based on the length of the locating pin 163.

[0179] FIG. 8 is a cross-sectional view of fluid section 14 in a partially disassembled state. In the example shown, the far clamp ring 98b that clamps the far diaphragm 28b to the pump housing 20 is formed by a portion of the pump cover 22. The pump cover 22 encloses the far diaphragm 28b and the far yoke 30b.

[0180] Prior to assembly, the far diaphragm 28b and the near diaphragm 28a are in the states shown in which the membranes 88 are flexed to positions associated with the end of their respective suction strokes. This state is the normal state of the near diaphragm 28a and far diaphragm 28b in which the near diaphragm 28a and far diaphragm 28b revert to when not deformed to another state. Such a configuration flexes the near diaphragm 28a in axial direction AD2 away from the far diaphragm 28b and flexes the far diaphragm 28b in axial direction ADI away from the near diaphragm 28a.

[0181] During assembly of fluid section, the far yoke 30b is connected to the far diaphragm 28b. The guide rods 32 are connected to the far yoke 30b. The far diaphragm 28b is fixed to the pump housing 20 by the far clamp ring 98b and the pump cover 22 encloses the far diaphragm 28b and the far yoke 30b. The near yoke 30a is connected to the near diaphragm 28a and the near diaphragm 28a is fixed to the pump housing 20 by the near clamp ring 98a.

[0182] Diaphragm connector 95 can provide for easy stepwise assembly of fluid section 14. For example, the threaded shaft 114 can be inserted through membrane 88 and into the inner backer 84. The outer backer 86 can then be aligned with membrane 88 and clamped to membrane 88 by nut 160. The membrane 88 can be mounted to the pump housing 20 before or after connecting the yoke 30a, 30b to the diaphragm 28a, 28b. For example, the clamp ring 98a, 98b can clamp the membrane 88 to the pump housing 20, then the yoke 30a, 30b can be aligned with the outer backer 86 and to the connector shaft 158 to secure the yoke 30a, 30b to the diaphragm 28a, 28b.

[0183] The far diaphragm 28b needs to be displaced in axial direction AD2 to allow for connection of the near yoke 30a to the guide rods 32, which fixes the near diaphragm 28a and far diaphragm 28b together for simultaneous axial movement. However, the near diaphragm 28a and the far diaphragm 28b are flexed away from each other in their normal states.

[0184] In the example shown, the fluid section 14 is configured such that the far diaphragm 28b can be mechanically displaced towards the near diaphragm 28a to facilitate connection of the near yoke 30a to the guide rods 32, thereby fixing the far diaphragm 28b and near diaphragm 28a together.

[0185] In this particular example, the pump cover 22 includes a displacement opening 164 through the pump cover 22. The displacement opening 164 is aligned on the pump axis PA. A displacer 166 can be fed through the displacement opening to mechanically displace the far yoke 30b and far diaphragm 28b in axial direction AD2 towards the near diaphragm 28a and near yoke 30a, which also displaces the guide rods 32 towards the near yoke 30a.

[0186] The displacement opening 164 can be a threaded opening through the pump cover 22. The displacer 166 includes a threaded shaft that can threadedly connect with the displacement opening 164. The displacer 166 can be configured as a jack screw, among other options.

[0187] The displacer 166 can be threaded into the displacement opening 164 in axial direction AD2 and exert a driving axial force on the far yoke 30b and far diaphragm 28b to displace the far yoke 30b and the far diaphragm 28b. In the example shown, the displacer 166 is configured to engage with the diaphragm connector 95 of the far diaphragm 28b. In the example shown, a plug 168 is mounted to the connector tube 162 of the diaphragm connector 95 of the far diaphragm 28b and the displacer 166 engages with the plug 168 to exert the mechanical driving force on the far yoke 30b and far diaphragm 28b. The displacer 166 continuing to be fed through the displacement opening 164 in axial direction AD2 causes the displacer 166 to exert the axial driving force, thereby displacing the far yoke 30b and the far diaphragm 28b in axial direction AD2.

[0188] Fluid section 14 is configured such that the far diaphragm 28b can be mechanically displaced towards the near diaphragm 28a to allow for connection of the near yoke 30a to the guide rods 32. Such a configuration allows for connecting the near diaphragm 28a and far diaphragm 28b together without connecting to the drive section 12. Such a configuration provides for a simple and quick asser for such connection to be formed as the connections between the near diaphragm 28a and guide rods 32 is covered by the drive housing 18 with the fluid section 14 mounted to the drive section 12. The drive section 12 does not need to displace any diaphragm to facilitate connections of the fluid section 14. The fluid section 14 can be fully assembled while dismounted from the drive section 12.

[0189] FIG. 9A is an isometric view of a clamp ring 98. FIG. 9B is an enlarged cross- sectional view showing an interface between clamp ring 98 and a membrane 88 of a diaphragm 28. FIG. 9C is an enlarged cross-sectional view showing another interface between clamp ring 98 and membrane 88. It is understood that, while clamp ring 98 is shown as a discrete component, similar to near clamp ring 98a, the discussion is equally applicable to far clamp ring 98b and any feature discussed herein can be applied to one or both of near clamp ring 98a, far clamp ring 98b, or any other structure used to hold a diaphragm 28 on the pump housing 20. Such features are applicable to near clamp ring 98a and / or far clamp ring 98b regardless of whether the clamp ring is formed separately from a cover structure (e.g., pump cover 22) or is integrated into a cover structure (e.g., pump cover 22).

[0190] Clamp ring 98 includes ring body 170, membrane trench 172, ribs 174, and rib gaps 176. Membrane trench 172 is formed on an axial side of ring body 170 that is configured to face axial inwards towards the pump housing 20. The membrane trench 172 is configured such that the bead 90 of the diaphragm 28 is disposed at least partially within the membrane trench 172.

[0191] Clamp ring 98 includes ring fastener openings 177 through the ring body 170. The ring fastener openings 177 provide passages for ring fasteners 134 to pass through to connect clamp ring 98 to the pump housing 20. In the examples shown, the static interface (e.g., formed by ring fasteners 134) that holds the clamp ring 98 to the pump housing 20 is disposed radially inward of the static interface (e.g., formed by housing fasteners 50) that connects the fluid section 14 to the drive section 12. As such, the static interface holding the clamp ring 98, and thus the diaphragm 28 clamped by the clamp ring 98, to the pump housing 20 is inaccessible with the fluid section 14 mounted to the drive section 12 in examples in which clamp ring 98 is formed separately form other housing structure.

[0192] In the example shown, ribs 174 are disposed in the membrane trench 172. The ribs 174 are disposed in an annular array that extends about the pump axis PA that extends through the clamp ring 98. Rib gaps 176 are disposed between the ribs 174. The clamp ring 98 is configured to clamp t

[0193] 20. The ribs 174 can directly interface with the diaphragm 28 and can exert a force on the diaphragm 28. The ribs 174 can directly interface with the bead 90 of the diaphragm 28. A portion of the bead 90 of the diaphragm 28 can be aligned with the ribs 174 and a portion of the bead 90 of the diaphragm 28 can be aligned with the rib gaps 176 between adjacent ones of the ribs 174. FIG. 9B shows the bead 90 interfacing with a rib 174 and FIG. 9C shows the bead 90 aligned with a rib gap 176.

[0194] The ribs 174 engaging with the diaphragm 28 provide improved retention of the diaphragm 28 on the pump housing 20 and resist rotation of the diaphragm 28 on the pump axis PA. The ribs 174 engaging with the diaphragm 28 provides an array of point forces that hold the diaphragm 28 and resist rotation of the diaphragm 28. Such a configuration assists in the diaphragms 28 providing the rotational resistance that prevents rotation of the near yoke 30a, far yoke 30b, and screw 80.

[0195] FIG. 10 is an enlarged cross-sectional view showing an interface between a clamp ring 98 and a membrane 88 of a diaphragm 28. As discussed above, the static interface holding the clamp ring 98 to the pump housing 20 may be inaccessible with the fluid section 14 mounted to the drive section 12 (e.g., when the clamp ring 98 is formed as the near clamp ring 98a holding the near diaphragm 28a). During operation of the pump 10, the ring fasteners 134 can loosen due to forces exerted during pumping. The ring fasteners 134 can thus require periodic tightening to maintain the desired clamping force on the diaphragm 28.

[0196] In the example shown, a backer ring 178 is disposed within the membrane trench 172. The backer ring 178 can interface with the membrane 88 and exerts a force on the membrane 88 to bias the membrane 88 into the pump housing 20. The backer ring 178 can be compressed between the bead 90 of the membrane 88 and the clamp ring 98. The backer ring 178 exerts a biasing force on the bead 90 to maintain loading on the diaphragm 28 that clamps the diaphragm 28 to the pump housing 20.

[0197] In various examples, the backer ring 178 extends fully annularly about the pump axis PA. The backer ring 178 can be deformable. The backer ring 178 can be formed from an elastomer, among other options. The backer ring 178 can be formed as an o-ring, among other options.

[0198] The backer ring 178 provides loading on the membrane 88 that can maintain clamping of the diaphragm 28 on the pump housing 20 even in the event that the ring fasteners 134 loosen. Such a configuration can maintain the diaphragm 28 clamped to the pump housing 20 with desired clamping force, eve fasteners 134. Such a configuration can be particularly advantageous in the examples shown where the ring fasteners 134 that hold the clamp ring 98 to the pump housing 20 are not accessible from an exterior of pump 10 with fluid section 14 mounted to drive section 12.

[0199] FIG. 11 is a cross-sectional view taken along line 11-11 in FIG. 3 showing drive section 12 of pump. The leak chamber 126 formed in the drive section 12 is shown. Leak chamber 126 is disposed at a vertically lower end of the drive housing 18. The leak chamber is disposed axially between the near pumping chamber 82a and the drive 56. The leak chamber 126 is configured to capture any pumped fluid that leaks from the pump 10 during operation.

[0200] In the example shown, the leak chamber 126 includes chamber floor 180 that is disposed on a vertically lower side of the leak chamber 126. Leak sensor 128 is mounted one sidewall 182 of the leak chamber 126 and a leak aperture 184 is formed through another sidewall 182 of the leak chamber 126. The sidewalls 182 through which the leak sensor 128 is mounted and the leak aperture 184 is formed are lateral walls of the leak chamber 126 in this examples. The leak sensor 128 is disposed on an opposite side of the leak chamber 126 from the leak aperture 184. Chamber floor 180 extends between the multiple sidewalls 182 that form the sides of the leak chamber 126.

[0201] In the example shown, chamber floor 180 is slanted such that the leak chamber 126 extends further vertically downward on a side closest to leak sensor 128 than on a side closest to leak aperture 184. The chamber floor 180 can thereby cause any leaked fluid to pool at a location proximate the leak sensor 128, which can accelerate the detection of any leak. The leak chamber 126 is configured such that any fluid leakage from the fluid section 14 pools within the leak chamber 126. The leak sensor 128 is configured to detect the presence of such leaked fluid and can provide a signal to the controller 62 indicating when a leak is detected.

[0202] The leak aperture 184 is disposed on an opposite side (opposite lateral side in this example) of the leak chamber 126 from the leak sensor 128. The leak aperture 184 can allow any leaked fluid to exit from the leak chamber 126 to an exterior of the pump 10 prior to the leaking fluid reaching a top level of the leak chamber 126. The leakage though the leak aperture 184 can provide a visual indication that a leak is occurring while also preventing the leaked fluid from filling up into the drive housing 18. It is understood that in various examples a plug can be inserted into the leak aperture 184 to close the leak aperture 184, such as when pumping sensitive fk prevented.

[0203] Leak aperture 184 is disposed vertically above the leak sensor 128. The leak aperture 184 being vertically higher than the leak sensor 128 allows the leak sensor 128 to detect the presence of any leaked fluid prior to that leaked fluid filling into leak chamber 126 to a height that reaches the leak aperture 184.

[0204] The configuration of leak chamber 126 provides significant advantages. The leak sensor 128 is configured to detect the presence of any fluid leaking from the near pumping chamber 82a and / or the far pumping chamber 82b. The leak chamber 126 is disposed axially between the electrical components in drive housing 18 (e.g., motor 54) and both of the near pumping chamber 82a and the far pumping chamber 82b. As such, the leak chamber 126 will capture the leaking fluid before the leaking fluid can reach such electrical components.

[0205] The leak chamber 126 is configured such that leaked fluid pools within the leak chamber 126 proximate the leak sensor 128, which can accelerate sensing of any fluid leakage. The chamber floor 180 causes any leaked fluid that enters into the leak chamber 126 to flow towards the sidewall 182 on which the leak sensor 128 is mounted.

[0206] FIG. 12A is an isometric view of pump housing 20. FIG. 12B is a cross-sectional view of pump housing 20, inlet manifold, and outlet manifold 26 taken along line B-B in FIG. IB with drive section 12 removed. FIGS. 12A and 12B are discussed together.

[0207] Wall 100 is disposed between and at least partially defines both of the near pumping chamber 82a and the far pumping chamber 82b. The pump housing 20 includes upper manifold support 186 and lower manifold support 188. The upper manifold support 186 and the lower manifold support 188 can be formed as plates. In the example shown, the inlet manifold 24 is configured to interface with the lower manifold support 188 and the outlet manifold 26 is configured to interface with the upper manifold support 186.

[0208] Inlet check valves 190a, 190b are configured to control flow of the pumped fluid into the near pumping chamber 82a and far pumping chamber 82b. In the example shown, the balls 194 of the inlet check valves 190a, 190b are disposed within the pump housing 20. In the example shown, the seats 196 of the inlet check valves 190a, 190b are captured between the pump housing 20 and the inlet manifold 24.

[0209] Inlet passages 198a, 198b are formed in the inlet manifold 24. Inlet passage 198a is fluidly connected to near pumping chamber 82a and inlet passage 198b is fluidly connected to the far pumping chamber 82b. The inlet check valves 190a, 190b are disposed downstream of the inlet passages 198a, 198b in th configured to prevent retrograde flow from the near pumping chamber 82a. Inlet check valve 190b is configured to prevent retrograde flow from the far pumping chamber 82b.

[0210] Outlet check valves 192a, 192b are configured to control flow of the pumped fluid out of the near pumping chamber 82a and the far pumping chamber 82b. In the example shown, the balls 194 of the outlet check valves 192a, 192b are disposed within the outlet manifold 26. In the example shown, the seats 196 of the outlet check valves 192a, 192b are captured between the pump housing 20 and the outlet manifold 26.

[0211] Outlet passages 200a, 200b are formed in the outlet manifold 26. Outlet passage 200a is fluidly connected to near pumping chamber 82a and outlet passage 200b is fluidly connected to the far pumping chamber 82b. The outlet check valves 192a, 192b are disposed within the outlet passages 200a, 200b in this example. Outlet check valve 192a is configured to prevent retrograde flow to the near pumping chamber 82a. Outlet check valve 192b is configured to prevent retrograde flow to the far pumping chamber 82b.

[0212] The inlet check valves 190a, 190b are offset from each other. The inlet check valve 190a is axially staggered from inlet check valve 190b along the pump axis PA. The axial staggering between inlet check valves 190a, 190b allows for fluid flow into the axially offset pumping chambers that are disposed on opposite axial sides of wall 100.

[0213] Similarly, the outlet check valves 192a, 192b are offset from each other. The outlet check valve 192a is axially staggered from the outlet check valve 192b along the pump axis PA. the axial staggering between the outlet check valves 192a, 192b allows for fluid flow out of the axially offset pumping chambers that are disposed on opposite axial sides of wall 100.

[0214] In the example shown, the inlet check valve 190a and the outlet check valve 192a are associated with the near pumping chamber 82a while inlet check valve 190b and outlet check valve 192b are associated with the far pumping chamber 82b. In the example shown, each of inlet check valves 190a, 190b and outlet check valves 192a, 192b are configured to be closed, at least in part, by gravity and are configured to be opened by fluid flow.

[0215] Chamber orifices 206 are formed in the pump housing 20 and open into the near pumping chamber 82a and far pumping chamber 82b. The chamber orifices 206 provide openings for fluid to flow into and out of the near pumping chamber 82a and the far pumping chamber 82b.

[0216] The multiple check valves associated with a single pumping chamber are laterally offset from each other. In the example shown, inlet check valve 190a is laterally offset from outlet check valve 192a while inlet check va check valve 192b. The lateral offset from inlet check valve 190a and outlet check valve 192a can encourage the pumped fluid to move throughout a larger portion of the near pumping chamber 82a, which can provide for more efficient cleaning and purging during cleanout. The lateral offset from inlet check valve 190b and outlet check valve 192b can encourage the pumped fluid to move throughout a larger portion of the far pumping chamber 82b, which can provide for more efficient cleaning and purging during cleanout.

[0217] In the example shown, the outlet check valves 192a, 192b are disposed directly vertically above the inlet check valves 190a, 190b. However, ones of check valves that are directly vertically over each other, even though such check valves may be axially offset, are associated with different pumping chambers. In the example shown, outlet check valve 192a is disposed directly vertically over inlet check valve 190b and outlet check valve 192b is disposed directly vertically over inlet check valve 190a. Such a configuration provides for a compact arrangement of pump 10.

[0218] In the example shown, the pump housing 20 is formed as a single component to which the inlet manifold 24 and the outlet manifold 26 are mounted. The inlet manifold 24 and outlet manifold 26 mounting to the single pump housing 20 provides for ease of assembly and prevents misalignment. In traditional double diaphragm pumps, the pumping chambers are defined by separate structures that are disposed on opposite axial sides of a drive section between the pumping chambers. The inlet manifold or outlet manifold needs to be aligned with those separate structures, which can be difficult and time consuming. The single upper manifold support 186 and the single lower manifold support 188 provides for quick and easy assembly of inlet manifold 24 and outlet manifold 26 to pump housing 20.

[0219] In the example shown, drain apertures 48a, 48b are formed in pump housing 20. Drain apertures 48 are disposed vertically below the near pumping chamber 82a and the far pumping chamber 82b. Drain aperture 48a is fluidly connected to the near pumping chamber 82a. Drain aperture 48b is fluidly connected to the far pumping chamber 82b. The drain apertures 48a, 48b are disposed downstream of the interfaces between the balls 194 and seats 196 of the inlet check valves 190a, 190b. In the example shown, the drain apertures 48a, 48b overlap with the balls 194 of the inlet check valves 190a, 190b.

[0220] The drain apertures 48 are disposed at a vertically lowest portion of the pump housing 20. The drain apertures 48a, 48b allow for draining of fluid from the pump housing 20, such as during servicing and maintenance. The drain apertures 48a, 48b allow the near pumping chamber 82a and far pumping chamber 82 fluid lines connected to the inlet manifold 24 and outlet manifold 26, minimizing waste and mess. The drain apertures 48a, 48b further facilitate draining of fluid from within pump housing 20 without having to disconnect the inlet manifold 24 or the outlet manifold 26 from the pump housing 20. The multiple drain apertures 48a, 48b allow for draining of a single one of near pumping chamber 82a and far pumping chamber 82b without draining the other, such as for maintenance or replacement of one of near diaphragm 28a and far diaphragm 28b.

[0221] Inlet drain aperture 202 is formed in inlet manifold 24. Inlet drain aperture 202 can be closed by a plug or other structure during pumping operations. Inlet drain aperture 202 is disposed upstream of the inlet check valves 190a, 190b. Inlet drain aperture 202 opens into inlet passage 198 that conveys fluid from the inlet 44 to the inlet passages 198. The inlet drain aperture 202 can open into a lower side of the inlet passage 198 in various examples. The inlet drain aperture 202 can allow for draining of fluid from the inlet manifold 24 and lines connected to inlet manifold 24 without disconnecting inlet manifold 24 and without requiring draining of other fluid conveying passages and chambers.

[0222] Outlet drain aperture 204 is formed in outlet manifold 26. Outlet drain aperture 204 can be closed by a plug or other structure during pumping operations. Outlet drain aperture 204 is disposed downstream of the outlet check valves 192a, 192b. Outlet drain aperture 204 opens into outlet passage 200 that conveys fluid from the outlet passages 200 to outlet 46. The outlet drain aperture 204 can open into a lower side of the outlet passage 200. The outlet drain aperture 204 can allow for draining of fluid from the outlet manifold 26 and lines connected to inlet manifold 24 without disconnecting outlet manifold 26 and without requiring draining of other fluid conveying passages and chambers.

[0223] FIG. 13A is an enlarged cross-sectional view showing a portion of fluid section 14. FIG. 13B is a cross-sectional view taken along line B-B in FIG. 13A. FIGS. 13A and 13B are discussed together. Fluid section 14 is the same as discussed above except that fluid section 14 further includes bushing 224.

[0224] Bushing 224 is disposed between guide rod 32 and guide tube 34. Bushing 224 is configured to provide support to guide rod 32 and can maintain axial alignment of guide rod 32 within guide tube 34. In the example shown, the bushing 224 does not fully annularly engage with the guide rod 32. Instead, the bushing 224 engages with the guide rod 32 for only a portion of the circumference of the guide rod 32. In the example shown, the bushing 224 can I due to the shape of the interior opening in the bushing 224 through which the guide rod 32 extends.

[0225] In the example shown, a holder 231 interfaces with the bushing 224 and the guide tube 34. The holder 231 keys the bushing 224 to the guide tube 34 and maintains the bushing 224 in a desired orientation within the guide tube 34. The holder 231 can be formed as a pin, among other options.

[0226] Spacing gap 225 is disposed between bushing 224 and guide rod 32 around at least a portion of the guide rod 32. In the example shown, the spacing gap 225 is disposed radially inwards towards the pump axis PA. A radial line extending directly outward from the pump axis PA passes through the spacing gap 225. A radial line extending directly outward from the pump axis PA passes through the spacing gap 225 prior to passing through the guide rod 32. It is understood that the spacing gap 225 can be so oriented radially inwards towards the pump axis PA regardless of the orientations of the near yoke 30a and far yoke 30b (e.g., whether near yoke 30a and far yoke 30b are oriented vertically, horizontally, or canted between vertical and horizontal).

[0227] In the example shown, the guide rod 32 includes rod flats 227 that interface with bushing flats 229 of the bushing 224. The rod flats 227 are formed on opposite sides of the guide rod 32. In the example shown, with near yoke 30a and far yoke 30b being horizontal, the rod flats 227 are oriented vertically. The rod flats 227 interfacing with the bushing flats 229 prevents rotation of the guide rod 32 relative to the bushing 224.

[0228] The spacing gap 225 is at least as wide as the width of the guide rod 32 oriented into the bushing. In the example shown, the width W 1 of the spacing gap 225 is at least as wide as the width W2 of the guide rod 32 between the rod flats 227.

[0229] The bushing 224 is configured to hold the guide rod 32 and can prevent rotation of various components of the fluid section 14. The bushing 224 can engage with the guide rod 32 on a side of the guide rod 32 oriented radially outward from the pump axis PA. The bushing 224 is configured to not engage with the guide rod 32 on a side of the guide rod 32 oriented radially inward towards the pump axis PA. Bushing 224 does not contact the guide rod 32 fully annularly around the guide rod 32.

[0230] In the example shown, the spacing gap 225 is configured to provide space that allows for some flexing of the guide rod 32 during reciprocation. The forces applied to the guide rods 32 in compression can cause the guide rods 32 to flex. Such flexing is radially inwards towards the pump axis PA. The spacing gap 225 can allow the guide rods 32 to flex without the portion of the guide rod 32 contact the bushing 224. Such a configuration can reduce wear on the guide rod 32 and provide for improved operating life.

[0231] FIG. 14 shows a pump 210. It will be understood that the pump 210 is an example of a double diaphragm pump and exhibits various aspects, one or more of which can be implemented in various other pumps. Pump axis PA is indicated in FIG. 14 Axial, as used herein, refers to a direction along this axis. A radial direction, an example of which is indicated, refers to being orthogonally outward from the axis. Radial does not refer to any particular direction (e.g., up, down, etc.) other than being orthogonally outward from the axis. Pump 210 shown is substantively similar to pump 10 except as discussed and noted below. Similar or same components between pump 10 and pump 210 are labeled with the same reference number except increased by “200” (e.g., near diaphragm 228a and near diaphragm 28a).

[0232] The pump 210 includes a drive section 212 and a fluid section 214. Generally, the drive section 212 receives power, such as electrical power, and outputs linear reciprocating mechanical motion that drives the fluid section 214. The fluid section 214 receives the linear reciprocating motion from the drive section 212 to pump the fluid. The fluid is pulled through an inlet 244 of an inlet manifold 224 and output to an outlet 246 of an outlet manifold 226.

[0233] In various embodiments, including the illustrated embodiment, the drive section 212 and the fluid section 214 are both mounted on a frame 216. The frame 216 can be a structural support, such as a being formed by one or more pieces of metal, that contact ground and fully support the drive section 212 and the fluid section 214.

[0234] The pump 210 includes controller 262. FIG. 14 shows a control housing 324 containing the controller 262. The controller 262 can include electrical components for managing the any of the functions referenced herein. For example, controller 262 can include one or more processors for receiving an input, such as a command regarding pumping pressure, speed, or just to start the pump 210, and can output electrical power to an electric motor 254 which causes the drive section 212 to operate pumping of the fluid section 214. The controller 262 can include memory. The controller 262 can include one or more circuit boards with programmed chips for performing various functions.

[0235] The fluid section 214 includes a pump housing 220. The pump housing 220 can be formed from metal, amongst other possibilities. The pump housing 220 forms at least part of two different pumping chambers, as further shown herein. The pumping chambers are made to expand and decrease in volume by mi corresponding with suction and pumping strokes. Specifically, a diaphragm advancing within a pumping chamber to decrease the volume within the chamber for fluid is a pumping stroke due to the movement of the diaphragm forcing the liquid from the chamber, and the diaphragm retracting away from the pumping chamber to increase the volume within the chamber for fluid is a suction stroke due to the movement of the diaphragm creating suction to pull liquid into the chamber. Each diagram reciprocates to alternate between suction and pumping strokes, the directional flow of the fluid managed by inlet and outlet check valves located respectively upstream and downstream from the chamber.

[0236] Shown in FIG. 14 is a far diaphragm 228b. A near diaphragm 228a is shown in subsequent Figures on the opposite side of the pump housing 220 relative to the far diaphragm 228b. The far diaphragm 228b is held within the pump housing 220 by far clamp ring 298b. In the example shown, the far clamp ring 298b is formed separate from any cover structure of the fluid section 214.

[0237] The far diaphragm 228b is made to move to expand and contract the available volume for fluid within the pumping chamber by movement of the far yoke 230b. The far yoke 230b connects to the far diaphragm 228b via a far coupling 408b. In various embodiments, and in the illustrated embodiment, a projection extends from the far diaphragm 228b which is received within a slot of the far yoke 230b. The projection can be part of a diaphragm connector 295, which can be formed as a bolt among other options, as shown elsewhere herein. The far diaphragm 228b is supported by an outer backer 286. The outer backer 286 can be a support disc through which the diaphragm connector 295 extends, as further shown herein. The interfacing of the projection and the slot form the far coupling 408b.

[0238] The far diaphragm 228b can be separated from the far yoke 230b by the projection sliding out from the slot. Such sliding motion of the far diaphragm 228b and / or near diaphragm 228a is radial relative to the axis. As such, radial motion of the far diaphragm 228b and / or near diaphragm 228a can connect and disconnect the far diaphragm 228b and / or near diaphragm 228a from the rest of the pump 210 and allow removal of the far diaphragm 228b and / or near diaphragm 228a from the pump housing 220. Such radial removal of the far diaphragm 228b and / or near diaphragm 228a allows servicing of the far diaphragm 228b and / or near diaphragm 228a (including whole replacement) without major (or possibly even minor) disassembly of the pump 210. For example, the far diaphragm 228b and / or : by removing any cover(s) (e.g., drive cover 258 and / or near clamp ring 298a for near diaphragm 228a and / or far clamp ring 298b for far diaphragm 228b), un-securing any connections of near coupling 408a and / or far coupling 408b and then sliding the far diaphragm 228b and / or near diaphragm 228a radially. The far diaphragm 228b and / or near diaphragm 228a could be mounted by removing any cover(s) (e.g., drive cover 258), sliding the far diaphragm 228b and / or near diaphragm 228a radially, securing any connections of near coupling and / or far coupling 408b, and then securing any covers (e.g., drive cover 258 and / or near clamp ring 298a for near diaphragm 228a and / or far clamp ring 298b for far diaphragm 228b).

[0239] Such radial removal of the far diaphragm 228b and / or near diaphragm 228a allows removal of the far diaphragm 228b and / or near diaphragm 228a without disconnecting the static connection between the drive section 212 and the fluid section 214. Such radial removal of the far diaphragm 228b and / or near diaphragm 228a allows removal of the far diaphragm 228b and / or near diaphragm 228a without disconnecting the near yoke 230a and / or far yoke 230b from the guide rods 232 and / or the drive section 212. The far diaphragm 228b and / or near diaphragm 228a can be removed without dismounting of the inlet manifold 224 and / or outlet manifold 226 from the pump housing 220.

[0240] The fluid section 214 is statically connected to the drive section 212 by a plurality of mounting members 410. The plurality of mounting members 410 can be arrayed around a central axis and / or arrayed around the components that deliver the reciprocating linear motion from the drive section 212 to the fluid section 214 (e.g., the shaft 314 as further shown herein). The mounting members 410 can be rods. The mounting members 410 can connect respectively between the pump housing 220 and a drive frame mount 412 of the drive section 212. The drive frame mount 412 can be a metal plate (or other structure) which can receive or otherwise engage with the mounting members 410.

[0241] The mounting members 410 structurally support (e.g., brace) the fluid section 214 relative to the drive section 212 while linear reciprocating motion is delivered between the drive section 212 and the fluid section 214. In various embodiments, including the embodiment shown, the mounting members 410 are received in slots of the pump housing 220 and / or the drive frame mount 412. Such interfacing forms mountings 414.

[0242] As shown, the mountings 414 can be the mounting members 410 being received in slots of the drive section 212 and / or the fluid section 214. The mountings 414 can be the mounting members 410 being received in slots of pump housing 220.

[0243] In the example shown, the slots are orientated in the same direction which allows the fluid section 214 to be slid off of the drive section 212 and / or the drive section 212 to be slid off of the fluid section 214, or otherwise allow quick removal of the mounting members 410 by mere sliding after unclamping. The mounting members 410 can facilitate clamping by threaded ends interfacing with nuts, amongst other clamping or fastening options.

[0244] The mounting members 410 can be decoupled to allow the fluid section 214 to rotate relative to the drive section 212 to allow draining of the fluid section 214 while the fluid section 214 remains at least partially attached to the drive section 212.

[0245] The inlet manifold 224 is configured to provide inflow of fluid to the pumping chambers of the pump 210. A first inlet check valve and a second inlet check valve are disposed upstream of the pumping chambers and prevent retrograde flow from the pumping chambers. One inlet check valve can control flow though inlet housing 240a and another inlet check valve can control flow through inlet housing 240b.

[0246] FIG. 14 shows that the outlet manifold 226 includes a outlet housing 242a and outlet housing 242b. The first outlet housing 242a and second outlet housing 242b can house respective outlet check valves.

[0247] On each manifold, the two check valves are staggered axially. For example, the outlet housing 242a is axially closer to the drive section 212 than the outlet housing 242b. Likewise, the inlet housing 240a is axially closer to the drive section 212 then inlet housing 240b. Such staggering along the axis can create a more compact pump.

[0248] It is noted that the far yoke 230b is angled such that far yoke 230b is neither entirely or substantially vertical nor entirely or substantially horizontal. The ends of the far yoke 230b connect with guide rods 232 as further shown in the subsequent FIG. 15. The guide rods 232 extend axially while the yoke arms 296 of the far yoke 230b extend radially. Such angling of the far yoke 230b (and / or the near yoke 230a) can help reduce the size of the pump 210.

[0249] FIG. 15 shows a cross-sectional view of the pump 210. The extent of the drive section 212 and the fluid section 214 are shown. The orientation of the cross-sectional view is cut through the far yoke 230b and the near yoke 230a, which as previously explained is at an angle and is neither horizontal nor vertical relative to the axis. Guide rods 232 connect the far yoke 23C embodiments, including the illustrated embodiments, the guide rods 232 extend through passages 416 formed within the pump housing 220. Rod fasteners 304 connect the guide rods 232 to the near yoke 230a and far yoke 230b. The rod fasteners 304 can be threaded into the guide rods 232. The rod fasteners 304 can be formed as bolts, among other options. In some alternative examples, the guide rods 232 can be threaded to nuts, such as by including threaded ends of the guide rods 232.

[0250] The guide rods 232 rigidly connect the near yoke 230a and far yoke 230b to each other such that movement of the near yoke 230a causes an equivalent simultaneous movement in the far yoke 230b. The near yoke 230a is connected to a shaft 314 by shaft coupling 420. As explained further herein, the shaft 314 is reciprocated linearly to convey reciprocating linear motion to the near yoke 230a which also conveys the same linear reciprocating motion through the guide rods 232 to the far yoke 230b.

[0251] Far yoke 230b is connected to the far diaphragm 228b. The far diaphragm 228b is reciprocated to expand and decrease the volume of the far pumping chamber 282b through suction and pumping strokes. The near yoke 230a is attached to near diaphragm 228a via the near coupling 408a, such that linear reciprocating motion of the near yoke 230a moves the near diaphragm 228a to increase and decrease the volume within the near pumping chamber 282a through suction and pumping strokes.

[0252] The far diaphragm 228b includes a membrane 288 that is pinched between outer backer 286 and inner backer 284. Both the inner backer 284 and outer backer 286 can provide stiffness and rigidity to the far diaphragm 228b which can increase a plunging volume of the far pumping chamber 282b while allowing a ring-shaped unbacked portion of the membrane 288 of the far diaphragm 228b to flex. The far diaphragm 228b includes a bead 290. The bead 290 can be a thick rim of the far diaphragm 228b which is received within a ringed cavity of the pump housing 220. The far clamp ring 298b may likewise include a ringed cavity and / or may force the bead 290 into the ringed cavity of the pump housing 220 to clamp the far diaphragm 228b into place while allowing it to move. The bead 290 is formed on the membrane 288 of the far diaphragm 228b.

[0253] The near diaphragm 228a includes a membrane 288 that is pinched between outer backer 286 and inner backer 284. Both the inner backer 284 and the outer backer 286 can provide stiffness and rigidity to the near diaphragm 228a which can increase a plunging volume of the near pumping chamber 282a while allowing a ring-shaped unbacked portion of the membrane 288 of the near diaphragm 228a to flex. The near diaphragm 228a includes a bead 290. The bead 290 can be a thick rim of the i within a ringed cavity of the pump housing 220. The near clamp ring 298a may likewise include a ring cavity and / or may force the bead 290 into the ring cavity of the pump housing 220 to clamp the near diaphragm 228a into place while allowing it to move. The bead 290 is formed on the membrane 288 of the near diaphragm 228a.

[0254] Both of the far clamp ring 298b and the near clamp ring 298a can be bolted on to the pump housing 220, among other options.

[0255] In various embodiments, including the illustrated embodiment, the pump housing 220 forms a wall 300. However, the wall 300 can be formed by a different structure in various other embodiments. The wall 300 forms part of both of the far pump chamber 282b and the near pump chamber 282a. Both of the far diaphragm 228b and the near diaphragm 228a alternately move closer and farther away from the wall 300 to alternately increase and decrease the volumes of the far pump chamber 282b and the near pump chamber 282a, to move through pumping cycles. As such, as the near diaphragm 228a moves away from the wall 300 to increase the volume of near pumping chamber 282a through a suction stroke, the far diaphragm 228b is moved towards the wall 300 to decrease the volume of far pumping chamber 282b in a pumping stroke. The electric motor 254, as further described herein, can reverse its rotational direction at the end of the stroke, and the shaft 314 and consequently the near yoke 230a and far yoke 230b, and guide rods 232 likewise reverse their linear reciprocating direction, such that the near diaphragm 228a moves toward from the wall 300 to decrease the volume of the near pumping chamber 282a through a pumping stroke, and the far diaphragm 228b is moved away the wall 300 to increase the volume of the far pumping chamber 282b through a suction stroke. As such, the electric motor 254 can reverse rotational directions and the shaft 314, the near yoke 230a and far yoke 230b, and the near diaphragm 228a and far diaphragm 228b, reverse directions such that one diaphragm is always in a suction stroke and another diaphragm is always in a pumping stroke, except at changeover between strokes, and which diaphragm is in the pumping or suction stroke switches on reversal of the electric motor 254.

[0256] The near diaphragm 228a and far diaphragm 228b will move through their respective pumping and suction strokes so long as the rotor 270 continues to rotate (or until a hard stop is encountered). As such, the stroke length can be variable. Contrast with a crank or eccentric drive, instead of a screw drive, which cannot variably change the stroke length during operation or through programming. The shaft coupling 420 that attaches the shaf the shaft 314 extending into the near yoke 230a. Such interface may include a threaded interface. It is noted that the shaft 314 may have a tendency to rotate as driven by the drive 256 as further described herein. However, the shaft 314 is stabilized from rotating by an off-center brace 422. While the shaft 314 is coaxial with the axis, the off-center brace 422 is not coaxial with the axis. The near yoke 230a is braced from rotating about the axis due to the two guide rods 232 extending through the passages 416 preventing rotation about the axis of the near yoke 230a. In the example shown, the guide rods 232 interface with bushings 424 within the passages 416.

[0257] The on-center (coaxial with the axis) connection between the shaft 314 and the near yoke 230a could permit rotation of the shaft 314 relative to the near yoke 230a which could undo threading. However, the off-center (not coaxial with the axis and thus not coaxial with the screw 280 and the shaft 314) brace 422 extending into each of the near yoke 230a and a collar 426 that is clamped around the shaft 314 prevents rotation of the shaft 314.

[0258] Focusing on the drive section 212, the electric motor 254 includes a rotor 270 and a stator 272. The stator 272 can be electrically energized such that current runs through one or more coils which generate electromagnetic fields. The electromagnetic field extends across an air gap to the rotor 270. The rotor 270 can include rotor magnetics 276, which can be permanent magnets, electromagnets, or other material that can be moved by a magnetic field. The rotor magnetics 276 are mounted on a rotor hub 274 of the rotor 270. The rotor hub 274 can convey rotational motion from the rotor magnetics 276 to a drive nut 278 of the drive 256.

[0259] The drive nut 278 is rotationally fixed to the rotor 270 such that the stator 272 rotating the rotor 270 also rotates the drive nut 278. The drive nut 278 interfaces directly (via threading) or indirectly (via rolling elements such as balls) with a screw 280. The drive nut 278 and the screw 280 form a drive 256. Screw 280 is fixed to the shaft 314. As shown, the shaft 314 extends through the screw 280. In various other embodiments, the shaft 314 can be integrated with the screw 280 to form a single contiguous component. Rotation of the drive nut 278 linearly reciprocates the screw 280 and consequently the shaft 314 due to rotational stabilization of the shaft 314 as previously described herein (e.g., rotational stabilization through the near yoke 230a and guide rods 232). As such, the near diaphragm 228a and far diaphragm 228b are not used to resist rotation in this example. While drive 256 is shown as including drive nut 278 and screw 280, the drive 256 can take other forms for converting rotational motion to reciprocating motion. Bearings 264a, 264b are located, at least in j motor 254. The bearings 264a, 264b allow the rotor 270 be stabilized while rotating relative to a drive frame 266. The drive frame 266 may be fixed to the drive frame mount 412. In various embodiments, the drive frame mount 412 is integrated and contiguous with the drive frame 266. In the illustrated embodiment, the bearings 264a, 264b interface with the rotor hub 274. It is noted that the bearings 264a, 264b are located one or both of internal to the motor 254 and / or on one side of the electric motor 254 on the fluid section 214 side of the electric motor 254, but are not on the far side of the electric motor 254 beyond the electric motor 254 the opposite direction (i.e. away from the fluid section 214). In other words, the bearings 264a, 264b are located on one axial side of the electric motor 254 but are not located on the other axial side of the electric motor 254.

[0260] Part of the drive frame 266 extends radially inside of the rotor 270. In the illustrated embodiment, a tube 268 portion of the drive frame 266 extends into the rotor 270 and supports bearings 264a, 264b. This portion of the drive frame 266 remains stationary while the rotor 270 rotates radially directly inside and outside of the portion of the drive frame 266.

[0261] The drive cover 258 extends over the drive 256 which can provide a safety barrier and protect the interfacing components of the drive 256 from contamination.

[0262] FIG. 16 shows a side view of the pump 210. The near coupling 408a which connects the near yoke 230a to the near diaphragm 228a is shown. The near coupling 408a can be the same as the far coupling 408b, including by having a projection-in-slot connection which permits coupling and decoupling by relative radial sliding motion.

[0263] The view of FIG. 16 shows how the outlet housing 242b is axially staggered relative to the outlet housing 242a. Likewise, the inlet housing 240b is axially staggered relative to the inlet housing 240a.

[0264] FIG. 17 shows a cross-sectional view that is taken along line 17-17 of FIG. 16. The cross-sectional view of FIG. 17 shows inlet check valves 390a, 390b and outlet check valves 392a, 392b. Each of the inlet check valves 390a, 390b and outlet check valves 392a, 392b is formed by a ball 394 and a seat 396. The inlet check valves 390a, 390b and the outlet check valves 392a, 392b are closed by gravity (at least in part) and are opened by fluid flow in the example shown.

[0265] FIG. 17 shows chamber orifices 406 which permit fluid to flow into and out of the near pumping chamber 282a and far pumping chamber 282b from the inlet check valves 390a, 390b and to the outlet check valves 392a, 392b. Components that are described as connected other without an intermediary component, unless it is specified that they are directly connected, in which case the two components are in contact with each other. Although not necessarily stated, any two materials that are contacting in any of the figures can be described (e.g., specifically claimed) as directly connected, and any two components described herein as being connected can be described (e.g., specifically claimed), optionally, as directly connected.

[0266] Optional language is used herein describing what “can” or “may” be present, or what “various” embodiments or examples may include, not what is or must necessarily be present. Therefore, if in reference to an embodiment or example, it is stated that an aspect “may” or “can” be present, then that option can be included, or left out, of the embodiment or example, particularly in a claim. Each sentence or paragraph can refer to multiple, independent aspects. A claim can be amended with a select word or phrase from a sentence or paragraph without taking the whole sentence or paragraph.

[0267] The present disclosure uses multiple examples to demonstrate various inventive aspects. The inventive scope of this disclosure is not necessarily limited to any one of these embodiments, nor to all of them in just the manner shown and / or described. Rather, the inventive aspects demonstrated herein can be implemented in various other manners. One aspect or feature shown or described from one embodiment could be implemented on another embodiment in this disclosure even if not shown or described for that embodiment, or various embodiments not illustrated herein. The embodiments illustrated and / or discussed are intended to be illustrative and not limiting, and the described and / or illustrated features can be mixed and matched between different embodiments while including and excluding various features amongst the embodiments.

[0268] Components with common reference numbers can be structurally and functionally equivalent except to the limited extent specifically shown and / or described to be different. As such, aspects discussed and / or shown in connection with one embodiment can be present in another embodiment even if not discussed and / or shown for the other embodiment, particularly when common reference numbers are used.

[0269] Discussion of Non-Exclusive Examples:

[0270] The following are non-exclusive descriptions of possible examples of the present invention(s) according to various examples of the disclosure. It is understood that while specific examples may refer to back to specific others of the examples, each example can be claimed individually or in combination with a otherwise within this disclosure, including as shown in the drawings.

[0271] Example 1. A double diaphragm pump, comprising: a fluid section comprising: a near diaphragm; a far diaphragm; a wall located directly between the near diaphragm and the far diaphragm; a near pumping chamber formed by the near diaphragm and the wall; and a far pumping chamber formed by the far diaphragm and the wall; and a drive section comprising: an electric motor that outputs rotational motion on a motor axis, the electric motor including a stator and a rotor configured to rotate on the motor axis; and a drive which converts rotational motion from the electric motor to linear motion which moves the near diaphragm and the far diaphragm; wherein the near diaphragm is disposed between the electric motor and the far diaphragm.

[0272] Example 2. The double diaphragm pump of example 1 , wherein the near diaphragm is connected to the far diaphragm for simultaneous movement of the near diaphragm and the far diaphragm.

[0273] Example 3. The double diaphragm pump of any one of examples 1 and 2, wherein the near diaphragm is connected to the far diaphragm by at least one guide rod extending around the near pumping chamber and the far pumping chamber.

[0274] Example 4. The double diaphragm pump of example 3, wherein the at least one guide rod includes a plurality of guide rods.

[0275] Example 5. The double diaphragm pump of any one of examples 3 and 4, wherein the at least guide rod includes a first guide rod and the second guide rod.

[0276] Example 6. The double diaphragm pump of example 5, wherein the first guide rod is disposed on an opposite lateral side of the wall from the second guide rod.

[0277] Example 7. The double diaphragm pump of any one of examples 5 and 6, further comprising: a near yoke connected to the near diaphragm; and a far yoke connected to the far diaphragm; wherein the first guide rod and the second guide rod connect the near yoke to the far yoke.

[0278] Example 8. The double diaphragm pump of example 7, wherein the near yoke is disposed directly between the near diaphragm and the drive.

[0279] Example 9. The double diaphragm pump of any one of examples 7 and 8, wherein the near yoke is directly connected to the drive.

[0280] Example 10. The double diaphragm pump of any one of examples 7-9, wherein the near yoke and the far yoke are oriented horizontally. Example 11. The double diaphragm pump < the first guide rod extends through a first guide tube and the second guide rod extends through a second guide tube.

[0281] Example 12. The double diaphragm pump of example 11, wherein the first guide rod does not interface with a bushing.

[0282] Example 13. The double diaphragm pump of example 11, wherein no bushing is disposed within either of the first guide tube or the second guide tube.

[0283] Example 14. The double diaphragm pump of example 11, wherein a first bushing is disposed in the first guide rod, the first bushing contacting the guide rod partially around an exterior of the first guide rod.

[0284] Example 15. The double diaphragm pump of example 11, wherein a first bushing is disposed in the first guide rod, and wherein the first bushing does not contact the first guide rod fully annularly around the guide rod.

[0285] Example 16. The double diaphragm pump of any one of examples 11-13, wherein the first guide rod is suspended within the first guide tube.

[0286] Example 17. The double diaphragm pump of example 1, wherein the near diaphragm is disposed coaxially with the far diaphragm on a pump axis.

[0287] Example 18. The double diaphragm pump of example 17, wherein the motor axis disposed coaxially with the pump axis.

[0288] Example 19. The double diaphragm pump of any one of examples 1, 17, and 18, wherein the drive comprises: a drive nut connected to rotor to rotate with the rotor; a screw configured to displace linearly due to rotation of the drive nut.

[0289] Example 20. The double diaphragm pump of example 19, wherein the screw is connected to a near yoke, the near yoke connected to the near diaphragm.

[0290] Example 21. The double diaphragm pump of example 20, further comprising a far yoke connected to the far diaphragm, the near yoke and the far yoke connected together.

[0291] Example 22. The double diaphragm pump of example 21, wherein the screw is keyed to the near yoke.

[0292] Example 23. The double diaphragm pump of example 22, wherein the screw includes a plurality of projections that extend into a plurality of receivers in the near yoke.

[0293] Example 24. The double diaphragm pump of any one of examples 19-23, further comprising: a shaft extending through the screw and connected to the near yoke.

[0294] Example 25. The double diaphragm pump of example 24, wherein the shaft clamps the screw to the near yoke. Example 26. The double diaphragm pump c the drive nut extends axially beyond a rotor hub of the rotor in a direction along the motor axis away from the near diaphragm.

[0295] Example 27. The double diaphragm pump of any one of examples 19-26, wherein a portion of the drive nut is disposed within the rotor.

[0296] Example 28. The double diaphragm pump of any one of examples 19-27, wherein the screw includes a threaded portion and an unthreaded portion, the unthreaded portion disposed between the threaded portion and the near diaphragm.

[0297] Example 29. The double diaphragm pump of any one of examples 1-28, wherein: the fluid section includes a pump housing; the near pumping chamber is formed in the pump housing; and the far pumping chamber is formed in the pump housing.

[0298] Example 30. The double diaphragm pump of example 29, wherein the near diaphragm is clamped to the pump housing.

[0299] Example 31. The double diaphragm pump of example 30, wherein the near diaphragm is clamped to the pump housing by a clamp ring connected to the pump housing.

[0300] Example 32. The double diaphragm pump of any one of examples 29-31, wherein the far diaphragm is clamped to the pump housing.

[0301] Example 33. The double diaphragm pump of any one of examples 29-32, further comprising: an inlet manifold mounted to the pump housing; and an outlet manifold mounted to the pump housing.

[0302] Example 34. The double diaphragm pump of example 33, wherein the pump housing, the inlet manifold, and the outlet manifold are dismountable from the drive section as a single assembly.

[0303] Example 35. The double diaphragm pump of any one of examples 33 and 34, wherein the near diaphragm is dismountable from the pump housing while one or both of the inlet manifold and the outlet manifold remain mounted to the pump housing.

[0304] Example 36. The double diaphragm pump of any one of examples 33-35, wherein the far diaphragm is dismountable from the pump housing while one or both of the inlet manifold and the outlet manifold remain mounted to the pump housing.

[0305] Example 37. The double diaphragm pump of any one of examples 33-36, wherein a near inlet passage of the inlet manifold is fluidly connected to the near pumping chamber and a far inlet passage of the inlet manifold is fluidly connected to the far pumping chamber, and wherein the near inlet passage is axially offset from the far inlet passage. Example 38. The double diaphragm pump c a near outlet passage of the outlet manifold is fluidly connected to the near pumping chamber and a far outlet passage of the outlet manifold is fluidly connected to the far pumping chamber, and wherein the near outlet passage is axially offset from the far outlet passage.

[0306] Example 39. The double diaphragm pump of any one of examples 1-38, further comprising: a first inlet check valve preventing retrograde flow from the near pumping chamber; and a second inlet check valve preventing retrograde flow from the far pumping chamber; wherein the first inlet check valve is axially offset from the second inlet check valve.

[0307] Example 40. The double diaphragm pump of any one of examples 1-40, further comprising: a first outlet check valve preventing retrograde flow to the near pumping chamber; and a second outlet check valve preventing retrograde flow to the far pumping chamber; wherein the first outlet check valve is axially offset from the second outlet check valve.

[0308] Example 41. The double diaphragm pump of any one of examples 1-40, wherein the fluid section is mountable to and dismountable from the drive section as a single assembly.

[0309] Example 42. The double diaphragm pump of any one of examples 1-41, wherein the rotor rotates in a first rotational direction to drive the near diaphragm through a pumping stroke and the far diaphragm through a suction stroke, and the rotor rotates in a second rotational direction opposite the first rotational direction to drive the near diaphragm through a suction stroke and the far diaphragm through a pumping stroke.

[0310] Example 43. The double diaphragm pump of any one of examples 1-43, wherein the drive section includes a drive housing within which the electric motor and the drive are at least partially disposed.

[0311] Example 44. The double diaphragm pump of example 43, wherein a leak chamber is formed in the drive housing, the leak chamber disposed vertically below the drive.

[0312] Example 45. The double diaphragm pump of example 44, wherein the leak chamber is disposed vertically below the electric motor.

[0313] Example 46. The double diaphragm pump of any one of examples 44 and 45, wherein the leak chamber comprises a chamber floor that is sloped between a first sidewall of the leak chamber and a second sidewall of the leak chamber. Example 47. The double diaphragm pump ol is disposed on a first lateral side of the leak chamber and the second sidewall is disposed on a second lateral side of the leak chamber.

[0314] Example 48. The double diaphragm pump of any one of examples 46 and 47, wherein an intersection between the chamber floor and the first sidewall is disposed vertically lower than an intersection between the chamber floor and the second sidewall.

[0315] Example 49. The double diaphragm pump of example 48, wherein a leak sensor is mounted to the first sidewall.

[0316] Example 50. The double diaphragm pump of any one of examples 48 and 49, wherein a leak aperture is formed through the second sidewall.

[0317] Example 51. The double diaphragm pump of any one of examples 46-48, wherein a leak sensor is mounted to the first sidewall, a leak aperture is formed through the second sidewall, and the leak aperture is disposed vertically above the leak sensor.

[0318] Example 52. The double diaphragm pump of any one of examples 43-51, wherein the drive housing includes a drive frame that supports the electric motor.

[0319] Example 53. The double diaphragm pump of example 52, wherein the drive frame axially overlaps with the rotor and radially overlaps with the rotor.

[0320] Example 54. The double diaphragm pump of any one of examples 52 and 53, wherein the drive frame includes a tube that extends axially into the electric motor.

[0321] Example 55. The double diaphragm pump of example 54, wherein the tube does not extend fully axially through the electric motor.

[0322] Example 56. The double diaphragm pump of any one of examples 54 and 55, wherein a rotor hub of the rotor radially overlaps with the tube both radially inward of the tube and radially outward of the tube.

[0323] Example 57. The double diaphragm pump of any one of examples 54 and 55, further comprising: a first bearing supporting the rotor, the first bearing mounted on the tube; a second bearing supporting the rotor, the second bearing mounted on the tube.

[0324] Example 58. The double diaphragm pump of example 57, wherein the first bearing is disposed between a first portion of a rotor hub of the rotor disposed radially inward of the tube and a second portion of the rotor hub disposed radially outward of the tube.

[0325] Example 59. The double diaphragm pump of example 58, wherein the first bearing interfaces with the first portion of the rotor hub. Example 60. The double diaphragm pump wherein the second bearing is disposed between the first portion of the rotor hub and the second portion of the rotor hub.

[0326] Example 61. The double diaphragm pump of example 60, wherein the second bearing interfaces with the first portion of the rotor hub.

[0327] Example 62. The double diaphragm pump of any one of examples 57-61, wherein the first bearing extends axially outward of the stator towards the near pumping chamber.

[0328] Example 63. The double diaphragm pump of any one of examples 57-62, wherein the first bearing is configured to react axial forces.

[0329] Example 64. The double diaphragm pump of any one of examples 57-63, wherein the first bearing is configured as a double row bearing.

[0330] Example 65. The double diaphragm pump of any one of examples 57-64, wherein the rotor is cantilevered from the first bearing and the second bearing in a direction axially away from the near pumping chamber.

[0331] Example 66. The double diaphragm pump of any one of examples 57-65, further comprising: an end cap connected to the drive frame, the end cap holding the first bearing.

[0332] Example 67. The double diaphragm pump of example 66, wherein a linear displacer of the drive extends axially through the end cap.

[0333] Example 68. The double diaphragm pump of example 67, wherein an inner seal is disposed between the end cap and the linear displacer to form a sliding seal between the end cap and the linear displacer.

[0334] Example 69. The double diaphragm pump of any one of examples 66-68, wherein an outer seal is disposed between the end cap and the drive housing to form a static seal between the end cap an the drive housing.

[0335] Example 70. The double diaphragm pump of any one of examples 1-69, wherein the near diaphragm includes: a near inner backer oriented into the near pumping chamber; a near outer backer; and a near membrane clamped between the near inner backer and the near outer backer; wherein the near membrane is keyed to one or both of the near inner backer and the near outer backer.

[0336] Example 71. The double diaphragm pump of example 70, wherein the near membrane is keyed to the near outer backer.

[0337] Example 72. The double diaphragm pump of example 71, wherein the near membrane includes a locating projection that extends into a locating aperture in the near outer backer to key the near membrane to the near outer backer. Example 73. The double diaphragm purr membrane includes: a near inner membrane oriented into the near pumping chamber; and a near backer membrane disposed on an opposite side of the near inner membrane from the near pumping chamber.

[0338] Example 74. The double diaphragm pump of example 73, wherein the near backer membrane includes a locating projection that extends into a locating aperture of the near outer backer to key the near backer membrane to the near outer backer.

[0339] Example 75. The double diaphragm pump of any one of examples 73 and 74, wherein at least one notch is formed in an outer edge of the near backer membrane, and wherein a locating pin is disposed within the notch to resist rotation of the near diaphragm.

[0340] Example 76. The double diaphragm pump of any one of examples 1-75, wherein the far diaphragm includes: a far inner backer oriented into the far pumping chamber; a far outer backer; and a far membrane clamped between the far inner backer and the far outer backer; wherein the far membrane is keyed to one or both of the far inner backer and the far outer backer.

[0341] Example 77. The double diaphragm pump of example 76, wherein the far membrane is keyed to the far outer backer.

[0342] Example 78. The double diaphragm pump of example 77, wherein the far membrane includes a locating projection that extends into a locating aperture in the far outer backer to key the far membrane to the far outer backer.

[0343] Example 79. The double diaphragm pump of example 76, wherein the far membrane includes: a far inner membrane oriented into the far pumping chamber; and a far backer membrane disposed on an opposite side of the far inner membrane from the far pumping chamber.

[0344] Example 80. The double diaphragm pump of example 79, wherein the far backer membrane includes a locating projection that extends into a locating aperture of the far outer backer to key the far backer membrane to the far outer backer.

[0345] Example 81. The double diaphragm pump of any one of examples 79 and 80, wherein at least one notch is formed in an outer edge of the far backer membrane, and wherein a locating pin is disposed within the notch to resist rotation of the far diaphragm.

[0346] Example 82. The double diaphragm pump of any one of examples 1-6, further comprising: a near yoke connected to the near diaphragm, wherein the near yoke is keyed to the near diaphragm. Example 83. The double diaphragm purr diaphragm comprises: a near inner backer oriented into the near pumping chamber; a near outer backer; and a near membrane clamped between the near inner backer and the near outer backer; wherein the near membrane is keyed to the near outer backer and the near yoke is keyed to the near outer backer.

[0347] Example 84. The double diaphragm pump of example 83, wherein the near yoke is clamped to the near outer backer.

[0348] Example 85. The double diaphragm pump of any one of examples 83 and 84, wherein the near outer backer includes at least one locating aperture, the membrane includes a locating projection the extends into the at least one locating aperture, and the near yoke includes at least one yoke projection that extends into the at least one locating aperture.

[0349] Example 86. The double diaphragm pump of example 85, wherein: the at least one locating aperture includes a first locating aperture and a second locating aperture; the locating projection is a first locating projection that extends into the first locating aperture from a first end of the first locating aperture; the near backer membrane includes a second locating projection that extends into the second locating aperture; the at least one yoke projection includes a first yoke projection and a second yoke projection; the first yoke projection extends into the first locating aperture from a second end of the first locating aperture; and the second yoke projection extends into the second locating aperture.

[0350] Example 87. A double diaphragm pump comprising: a fluid section comprising: a pump housing; a near diaphragm clamped to the pump housing; a near yoke connected to the near diaphragm; a far diaphragm clamped to the pump housing; a far yoke connected to the near yoke and the far diaphragm; a wall located directly between the near diaphragm and the far diaphragm; a near pumping chamber formed by the near diaphragm and the wall; and a far pumping chamber formed by the far diaphragm and the wall; and a drive section comprising: an electric motor that outputs rotational motion on a motor axis, the electric motor including a stator and a rotor configured to rotate on the motor axis; and a drive which converts rotational motion from the electric motor to linear motion which moves the near diaphragm and the far diaphragm, the drive connected to the near yoke.

[0351] Example 88. The double diaphragm pump of example 87, further comprising: a plurality of guide rods extending between and connecting the near yoke and the far yoke. Example 89. The double diaphragm pump c guide rods are at least partially disposed in a plurality of guide tubes connected to the pump housing.

[0352] Example 90. The double diaphragm pump of any one of examples 87-89 further comprising a shaft that extends through the drive and connects to the near yoke, the shaft connecting the drive to the near yoke.

[0353] Example 91. The double diaphragm pump of example 90, wherein the shaft extends fully axially through a linear displacer of the drive.

[0354] Example 92. The double diaphragm pump of example 91, wherein the linear displacer is a screw.

[0355] Example 93. The double diaphragm pump of any one of examples 91 and 92, wherein the shaft is accessible from an end of the linear displacer opposite the near yoke to connect the shaft to the near yoke and disconnect the shaft from the near yoke.

[0356] Example 94. The double diaphragm pump of any one of examples 90-93, wherein the shaft extends fully axially through the electric motor.

[0357] Example 95. The double diaphragm pump of any one of examples 90-94, wherein the shaft is disposed coaxially with a pump axis along which the near diaphragm and the far diaphragm reciprocate.

[0358] Example 96. The double diaphragm pump of any one of examples 90-95, wherein the near yoke is clamped to the near diaphragm by a diaphragm connector, and wherein the shaft is directly connected to the diaphragm connector.

[0359] Example 97. The double diaphragm pump of example 96, wherein the shaft is threadedly connected to the diaphragm connector.

[0360] Example 98. The double diaphragm pump of any one of examples 87-97, wherein the wall is formed by the pump housing.

[0361] Example 99. The double diaphragm pump of any one of examples 87-98, wherein the fluid section is mountable to and dismountable from the drive section while the near diaphragm and the far diaphragm remain connected to the pump housing.

[0362] Example 100. A double diaphragm pump, comprising: a fluid section comprising: a pump housing; a near diaphragm connected to the pump housing, the near diaphragm comprising: a near inner backer oriented into a near pumping chamber; a near outer backer; and a near membrane between the near inner backer and the near outer backer, wherein the near membrane is keyed to the near outer backer; a far diaphragm connected to the pump housing, the far diaphragm comprising: a far inner backer oriented into a far pumping chamber; a far outer backer; and a far membrane b< outer backer, wherein the far membrane is keyed to the far outer backer; and a wall located directly between the near diaphragm and the far diaphragm; wherein the near pumping chamber is formed by the near diaphragm and the wall; and wherein the far pumping chamber is formed by the far diaphragm and the wall; and a drive section comprising: an electric motor configured to output rotational motion on a motor axis, the electric motor including a stator and a rotor configured to rotate on the motor axis; and a drive which converts rotational motion from the electric motor to linear motion which moves the near diaphragm and the far diaphragm.

[0363] Example 101. The double diaphragm pump of example 100, further comprising: a near yoke connected to the near diaphragm and connected to the drive.

[0364] Example 102. The double diaphragm pump of example 101, wherein the near yoke is keyed to the near diaphragm.

[0365] Example 103. The double diaphragm pump of example 102, wherein the near yoke is keyed to the near outer backer.

[0366] Example 104. The double diaphragm pump of example 103, wherein a near locating projection of the near membrane extends into a near locating aperture of the outer backer.

[0367] Example 105. The double diaphragm pump of example 104, wherein a near yoke projection of the near yoke extends into the outer backer.

[0368] Example 106. The double diaphragm pump of example 105, wherein the near yoke projection extends into the near locating aperture.

[0369] Example 107. The double diaphragm pump of any one of examples 101-106, wherein the drive comprises: a drive nut connected to the rotor to rotate with the rotor; and a screw configured to displace linearly along the motor axis due to rotation of the drive nut.

[0370] Example 108. The double diaphragm pump of example 107, wherein the screw is keyed to the near yoke.

[0371] Example 109. The double diaphragm pump of example 108, wherein at least one projection of the screw extends into at least one receiver of the near yoke.

[0372] Example 110. The double diaphragm pump of any one of examples 107-109, wherein the screw is clamped to the near diaphragm by a shaft extending fully axially through the screw.

[0373] Example 111. The double diaphragm pump of any one of examples 101-110, further comprising: a far yoke connected to the far diaphragm and connected to the near yoke. Example 112. The double diaphragm pump is keyed to the far diaphragm.

[0374] Example 113. The double diaphragm pump of example 112, wherein the far yoke is keyed to the far outer backer.

[0375] Example 114. The double diaphragm pump of example 113, wherein a far locating projection of the far membrane extends into a far locating aperture of the outer backer.

[0376] Example 115. The double diaphragm pump of example 114, wherein a far yoke projection of the far yoke extends into the outer backer.

[0377] Example 116. The double diaphragm pump of example 115, wherein the far yoke projection extends into the far locating aperture.

[0378] Example 117. The double diaphragm pump of any one of examples 100-116, wherein the near membrane comprises: a near inner membrane oriented into the near pumping chamber; a near backer membrane disposed on an opposite side of the near inner membrane from the near pumping chamber; the near backer membrane including at least one notch formed in an outer edge of the near backer membrane, wherein a locating pin connected to the pump housing is at least partially disposed in the at least one notch to inhibit rotation of the near membrane relative to the pump housing.

[0379] Example 118. The double diaphragm pump of example 117, wherein the at least one notch includes a first notch and a second notch, the second notch disposed on an opposite circumferential side of the near backer membrane from the first notch.

[0380] Example 119. The double diaphragm pump of any one of examples 100-116, wherein the far membrane comprises: a far inner membrane oriented into the far pumping chamber; a far backer membrane disposed on an opposite side of the far inner membrane from the far pumping chamber; the far backer membrane including at least one notch formed in an outer edge of the far backer membrane, wherein a locating pin connected to the pump housing is at least partially disposed in the at least one notch to inhibit rotation of the far membrane relative to the pump housing.

[0381] Example 120. The double diaphragm pump of example 119, wherein the at least one notch includes a first notch and a second notch, the second notch disposed on an opposite circumferential side of the far backer membrane from the first notch.

[0382] Example 121. The double diaphragm pump of any one of examples 100-120, further comprising: a near clamp ring, the near clamp ring clamping the near diaphragm to the pump housing. Example 122. The double diaphragm pump c ring comprises: a membrane trench configured to receive a bead of the near membrane; and an array of ribs disposed in the membrane trench, the array of ribs interfacing with the bead of the near membrane.

[0383] Example 123. The double diaphragm pump of example 121, further comprising: an annular ring disposed in a membrane trench of the near clamp ring, the annular ring interfacing with a bead of the near membrane to bias the bead towards the pump housing.

[0384] Example 124. The double diaphragm pump of any one of examples 100-123, further comprising: a far clamp ring, the far clamp ring clamping the far diaphragm to the pump housing.

[0385] Example 125. The double diaphragm pump of example 124, wherein the far clamp ring comprises: a membrane trench configured to receive a bead of the far membrane; and an array of ribs disposed in the membrane trench, the array of ribs interfacing with the bead of the far membrane.

[0386] Example 126. The double diaphragm pump of any one of examples 124 and 125, wherein the far clamp ring is formed as a portion of a far cover mounted to the pump housing and enclosing the far diaphragm.

[0387] Example 127. A double diaphragm pump, comprising: a fluid section comprising: a near diaphragm; a far diaphragm; a wall located directly between the near diaphragm and the far diaphragm; a near pumping chamber formed by the near diaphragm and the wall; and a far pumping chamber formed by the far diaphragm and the wall; and a drive section comprising: a drive housing, the drive housing including a drive frame including a tube; an electric motor disposed in the drive housing, the electric motor configured to output rotational motion on a motor axis, the electric motor including a stator and a rotor configured to rotate on the motor axis, wherein the rotor includes a rotor hub supported by the tube; and a drive which converts rotational motion from the electric motor to linear motion which moves the near diaphragm and the far diaphragm.

[0388] Example 128. The double diaphragm pump of example 127, wherein the tube is received by the rotor hub such that a first portion of the rotor hub radially overlaps with the tube radially outward of the tube and a second portion of the rotor hub radially overlaps with the tube radially outward of the tube.

[0389] Example 129. The double diaphragm pump of example 128, wherein the first portion of the rotor hub supports rotor magnetics of the rotor. Example 130. The double diaphragm pump first bearing disposed between the rotor hub and the tube; and a second bearing disposed between the rotor hub and the tube.

[0390] Example 131. The double diaphragm pump of example 130, wherein the first bearing is disposed between the second portion of the rotor hub and the tube.

[0391] Example 132. The double diaphragm pump of any one of examples 130 and 131, wherein the second bearing interfaces with the second portion of the rotor hub and the tube.

[0392] Example 133. The double diaphragm pump of any one of examples 130-132, wherein the first bearing extends axially outward of the stator towards the near pumping chamber.

[0393] Example 134. The double diaphragm pump of any one of examples 130-133, wherein the first bearing is configured to react axial forces.

[0394] Example 135. The double diaphragm pump of any one of examples 130-134, wherein the first bearing is configured as a double row bearing.

[0395] Example 136. The double diaphragm pump of any one of examples 130-135, wherein the rotor hub is cantilevered from the first bearing and the second bearing in a direction axially away from the near pumping chamber.

[0396] Example 137. The double diaphragm pump of any one of examples 127-136, wherein the rotor hub extends axially outward from the tube in a direction away from the near pumping chamber.

[0397] Example 138. The double diaphragm pump of any one of examples 127-137, wherein no bearing rotatably supporting the rotor is disposed axially outward of the stator in an axial direction away from the near pumping chamber.

[0398] Example 139. The double diaphragm pump of any one of examples 127-138, wherein the drive comprises: a drive nut connected to the rotor hub to rotate with the rotor hub; and a screw configured to displace linearly due to rotation of the drive nut, the screw configured to provide the linear motion to the near diaphragm and the far diaphragm.

[0399] Example 140. The double diaphragm pump of example 139, wherein the screw extends fully axially through the rotor hub.

[0400] Example 141. A double diaphragm pump, comprising: a fluid section comprising: a near diaphragm; a far diaphragm; a wall located directly between the near diaphragm and the far diaphragm; a near pumping chamber formed by the near diaphragm and the wall; and a far pumping chamber formed by the far diaphragm and the wall; and a drive section comprising: a drive housing; an electric motor disposed in the drive housing, the electric motor configured to output rotational motion on a r a stator and a rotor configured to rotate on the motor axis; a drive which converts rotational motion from the electric motor to linear motion which moves the near diaphragm and the far diaphragm; and a leak chamber formed in the drive housing, the leak chamber disposed vertically below the drive.

[0401] Example 142. The double diaphragm pump of example 141, wherein the leak chamber is disposed vertically below the electric motor.

[0402] Example 143. The double diaphragm pump of any one of examples 141 and 142, wherein the leak chamber comprises a chamber floor that is sloped between a first sidewall of the leak chamber and a second sidewall of the leak chamber.

[0403] Example 144. The double diaphragm pump of example 143, wherein the first sidewall is disposed on a first lateral side of the leak chamber and the second sidewall is disposed on a second lateral side of the leak chamber.

[0404] Example 145. The double diaphragm pump of any one of examples 143 and 144, wherein an intersection between the chamber floor and the first sidewall is disposed vertically lower than an intersection between the chamber floor and the second sidewall.

[0405] Example 146. The double diaphragm pump of example 145, wherein a leak sensor is mounted to the first sidewall.

[0406] Example 147. The double diaphragm pump of any one of examples 145 and 146, wherein a leak aperture is formed through the second sidewall.

[0407] Example 148. The double diaphragm pump of any one of examples 143-145, wherein a leak sensor is mounted to the first sidewall, a leak aperture is formed through the second sidewall, and the leak aperture is disposed vertically above the leak sensor.

[0408] Example 149. A double diaphragm pump, comprising: a fluid section comprising: a pump housing; an inlet manifold mounted to the pump housing; an outlet manifold mounted to the pump housing; a near diaphragm configured to reciprocate on a pump axis; a far diaphragm configured to reciprocate on the pump axis; a wall located directly between the near diaphragm and the far diaphragm; a near pumping chamber formed by the near diaphragm and the wall; and a far pumping chamber formed by the far diaphragm and the wall; and a drive section comprising: an electric motor that outputs rotational motion on a motor axis, the electric motor including a stator and a rotor configured to rotate on the motor axis; and a drive which converts rotational motion from the electric motor to linear motion which moves the near diaphragm and the far diaphragm; wherein the fluid section is mountable to and dismountable from the drive s outlet manifold connected to the pump housing.

[0409] Example 150. The double diaphragm pump of example 149, wherein: the inlet manifold includes a first inlet passage configured to provide pumped fluid to the near pumping chamber and a second inlet passage configured to provide the pumped fluid to the far pumping chamber; and the first inlet passage is axially offset from the second inlet passage along the pump axis.

[0410] Example 151. The double diaphragm pump of example 150, wherein an inlet drain aperture is formed in the inlet manifold.

[0411] Example 152. The double diaphragm pump of example 151, wherein the inlet drain aperture is disposed in a lower portion of an inlet flowpath of the inlet manifold.

[0412] Example 153. The double diaphragm pump of any one of examples 151 and 152, wherein the inlet drain aperture is disposed vertically below a plurality of inlet check valves.

[0413] Example 154. The double diaphragm pump of any one of examples 149-153, wherein: the outlet manifold includes a first outlet passage configured to receive the pumped fluid from the near pumping chamber and a second outlet passage configured to receive the pumped fluid from the far pumping chamber; and the first outlet passage is axially offset from the second outlet passage along the pump axis.

[0414] Example 155. The double diaphragm pump of example 154, wherein an outlet drain aperture is formed in the outlet manifold.

[0415] Example 156. The double diaphragm pump of example 155, wherein the outlet drain aperture is formed in a lower portion of an outlet flowpath of the outlet manifold.

[0416] Example 157. The double diaphragm pump of any one of examples 155 and 156, wherein the outlet drain aperture is disposed vertically above a plurality of outlet check valves.

[0417] Example 158. The double diaphragm pump of any one of examples 149-157, wherein the pump housing further comprises: a first housing drain aperture open to a first intake pathway extending between the inlet manifold and the near pumping chamber; and a second housing drain aperture open to a second intake pathway extending between the inlet manifold and the far pumping chamber.

[0418] Example 159. The double diaphragm pump of example 158, wherein the first housing drain aperture is aligned with a ball of a first inlet check valve. Example 160. The double diaphragm pump wherein the second housing drain aperture is aligned with a ball of a second inlet check valve.

[0419] Example 161. A double diaphragm pump, comprising: a fluid section comprising: a pump housing; a near diaphragm connected to the pump housing and configured to reciprocate on a pump axis; a far diaphragm connected to the pump housing and configured to reciprocate on the pump axis; a wall located directly between the near diaphragm and the far diaphragm; a near pumping chamber formed by the near diaphragm and the wall; a far pumping chamber formed by the far diaphragm and the wall; a near inlet passage in the pump housing fluidly connected to the near pumping chamber; and a far inlet passage in the pump housing fluidly connected to the far pumping chamber, the far inlet passage axially offset from the near inlet passage along the pump axis; and a drive section comprising: an electric motor that outputs rotational motion on a motor axis, the electric motor including a stator and a rotor configured to rotate on the motor axis; and a drive which converts rotational motion from the electric motor to linear motion which moves the near diaphragm and the far diaphragm.

[0420] Example 162. The double diaphragm pump of example 161, further comprising: a first inlet check valve configured to prevent retrograde flow from the near pumping chamber; and a second inlet check valve configured to prevent retrograde flow from the far pumping chamber.

[0421] Example 163. The double diaphragm pump of example 162, wherein a ball of the first inlet check valve is disposed in the pump housing and a ball of the second inlet check valve is disposed in the pump housing.

[0422] Example 164. The double diaphragm pump of any one of examples 161-163 further comprising: a near outlet passage in the pump housing fluidly connected to the near pumping chamber; and a far outlet passage in the pump housing fluidly connected to the far pumping chamber, the far outlet passage axially offset from the near outlet passage along the pump axis.

[0423] Example 165. The double diaphragm pump of example 164, wherein at least a portion of the near inlet passage is disposed directly vertically above at least a portion of the far outlet passage.

[0424] Example 166. The double diaphragm pump of any one of examples 164 and 165, wherein at least a portion of the far inlet passage is disposed directly vertically above at least a portion of the near outlet passage. Example 167. The double diaphragm pun further comprising: a first outlet check valve configured to prevent retrograde flow to the near pumping chamber; and a second outlet check valve configured to prevent retrograde flow to the far pumping chamber.

[0425] Example 168. The double diaphragm pump of example 167, wherein a seat of the first outlet check valve is disposed at least partially in the pump housing and a seat of the second outlet check valve is disposed at least partially in the pump housing.

[0426] Example 169. The double diaphragm pump of any one of examples 161-168, wherein pump housing includes the wall.

[0427] Example 170. A double diaphragm pump, comprising: a fluid section comprising: a pump housing; a near diaphragm configured to reciprocate on a pump axis; a far diaphragm configured to reciprocate on the pump axis; a wall located directly between the near diaphragm and the far diaphragm; a near pumping chamber formed by the near diaphragm and the wall; and a far pumping chamber formed by the far diaphragm and the wall; and a drive section comprising: a drive housing; an electric motor that outputs rotational motion on a motor axis, the electric motor including a stator and a rotor configured to rotate on the motor axis; and a drive which converts rotational motion from the electric motor to linear motion which moves the near diaphragm and the far diaphragm; wherein the fluid section is configured to connect to the drive section at a dynamic interface that provides the linear motion to the fluid section and a static interface that fixes the pump housing to the drive housing; and wherein the drive section is configured to support and hold the fluid section with the static interface broken by a plurality of mount supports extending from one of the drive housing and the pump housing being received in a plurality of mount receivers formed in the other one of the drive housing and the pump housing.

[0428] Example 171. The double diaphragm pump of example 170, wherein the plurality of mount supports extend from the drive housing and the plurality of mount receivers are formed in the pump housing.

[0429] Example 172. The double diaphragm pump of any one of examples 170 and 171, wherein a first mount support of the plurality of mount supports includes a shaft and a head disposed at an end of the shaft.

[0430] Example 173. The double diaphragm pump of example 172, wherein a first mount receiver of the plurality of mount receivers includes a receiving aperture sized such that the head can pass through the receiving aperture and a retaining aperture sized such that the head cannot pass through the receiving aperture. Example 174. The double diaphragm pun wherein the fluid section hanging from the drive housing by the plurality of mount supports interfacing with the plurality of mount receivers aligns a first plurality of fastener openings of the pump housing with a second plurality of fastener openings of the drive housing.

[0431] Example 175. A method of assembling a fluid section of a double diaphragm pump, the fluid section including a near diaphragm configured to reciprocate on a pump axis, a near yoke connected to the near diaphragm, a far diaphragm configured to reciprocate on the pump axis, a far yoke connected to the far diaphragm, a wall located directly between the near diaphragm and the far diaphragm, a near pumping chamber formed by the near diaphragm and the wall, a far pumping chamber formed by the far diaphragm and the wall, and a far cover enclosing the far diaphragm and the far yoke, the method comprising: threading a jack screw through an opening in the far cover; exerting a driving force on the far yoke by the jack screw to cause the far yoke and the far diaphragm to displace towards the near diaphragm; with the far yoke and the far diaphragm displaced towards the near diaphragm, connecting a plurality of guide rods that extend from the far yoke to the near yoke to fix the far yoke and the near yoke together.

[0432] Example 176. A double diaphragm pump, comprising: a fluid section comprising: a near diaphragm; a far diaphragm; a wall located directly between the near diaphragm and the far diaphragm; a near pumping chamber formed by the near diaphragm and the wall; and a far pumping chamber formed by the far diaphragm and the wall; and a drive section comprising: an electric motor that outputs rotational motion; and a drive which converts rotational motion from the electric motor to linear motion which moves the near diaphragm and the far diaphragm.

[0433] Example 177. The double diaphragm pump of example 176, wherein the electric motor is not directly or indirectly between the far diaphragm and the near diaphragm.

[0434] Example 178. The double diaphragm pump of any one of examples 176 and 177, wherein an axis along which both of the far diaphragm and the near diaphragm reciprocate extends through the electric motor.

[0435] Example 179. The double diaphragm pump of example 178, wherein the axis is coaxial with an axis of rotation of a rotor of the electric motor.

[0436] Example 180. The double diaphragm pump of example 176, wherein the drive comprises a nut and a screw.

[0437] Example 181. The double diaphragm pump of example 180, wherein the electric motor reverses the direction of rotation from a first rotational direction to a second rotational direction to transition the far diaphragm fn stroke and simultaneously the near diaphragm from a near suction stroke to a near pumping stroke.

[0438] Example 182. The double diaphragm pump of example 181, wherein a stroke length of both of the far diaphragm and the near diaphragm is variable and based on a number of revolutions of a rotor of the electric motor, such that a subsequent stroke length can be made longer or shorter relative to a previous stroke length.

[0439] Example 183. The double diaphragm pump of any one of examples 181 and 182, wherein an axis that is coaxial with both of the far diaphragm and the near diaphragm is coaxial with the screw.

[0440] Example 184. The double diaphragm pump of any one of examples 181-183, wherein an axial middle of the nut is further away from the near diaphragm than an axial middle of the rotor is to the near diaphragm.

[0441] Example 185. The double diaphragm pump of any one of examples 176-184, further comprising at least one yoke to which at least one of the far diaphragm and the near diaphragm are respectively connected to reciprocate the at least one of the far diaphragm and the near diaphragm through one or both of pumping strokes and suction strokes.

[0442] Example 186. The double diaphragm pump of example 185, wherein the at least one yoke is elongate.

[0443] Example 187. The double diaphragm pump of example 186, wherein the at lease one yoke is orientated such that the at least one yoke is not lengthwise horizontal nor vertical.

[0444] Example 188. The double diaphragm pump of example 187, wherein the at least one yoke is orientated between 30-degrees and 60-degrees, inclusive.

[0445] Example 189. The double diaphragm pump of example 186, wherein the at least one yoke extends horizontally lengthwise.

[0446] Example 190. The double diaphragm pump of any one of examples 185-189, wherein each of the at least one of the far diaphragm and the near diaphragm is disconnectable from the at least one yoke to which the respective diaphragm is connected by radial motion of the diaphragm.

[0447] Example 191. The double diaphragm pump of any one of examples 185-190, wherein each of the at least one of the far diaphragm and the near diaphragm is dismountable from the pump without disconnecting the fluid section from the drive section. Example 192. The double diaphragm pun wherein the at least one yoke comprises a near yoke and a far yoke to which the near diaphragm and the far diaphragm are respectively connected to reciprocate the far diaphragm and the near diaphragm.

[0448] Example 193. The double diaphragm pump of example 192, further comprising at least one rod that connects with each of the near yoke and the far yoke and which transfers motion from the near yoke to the far yoke for simultaneous movement.

[0449] Example 194. The double diaphragm pump of example 193, wherein the pump section further comprise a pump housing, and the pump housing comprises one or more passages through which the at least one rod extends.

[0450] Example 195. The double diaphragm pump of example 194, wherein the at least one rod extending through the one or more passages braces a screw of the drive from rotating during pumping.

[0451] Example 196. The double diaphragm pump of any one of examples 176-195, wherein the drive section comprises a drive frame which is stationary during pumping, a tube of the drive frame extends into a spinning rotor of the electric motor during pumping.

[0452] Example 197. The double diaphragm pump of any one of examples 176-196, further comprising an inlet manifold that contains a first inlet check valve and a second inlet check valve, wherein the first inlet check valve is closer to the electric motor than the second inlet check valve is to the electric motor.

[0453] Example 198. The double diaphragm pump of any one of examples 176-197, further comprising an outlet manifold that contains a first outlet check valve and a second outlet check valve, wherein the first outlet check valve is closer to the electric motor than the second outlet check valve is to the electric motor.

[0454] Example 199. The double diaphragm pump of any one of examples 176-198, further comprising an outlet manifold that contains a first outlet check valve and a second outlet check valve and an inlet manifold that contains a first inlet check valve and a second inlet check valve, wherein the far diaphragm and the near diaphragm are dismountable from the pump section without dismounting either of the outlet manifold and the inlet manifold.

[0455] Example 200. The double diaphragm pump of any one of examples 176-199, further comprising a shaft that delivers linear reciprocating motion from the drive to a near yoke, the near yoke connected to the near diaphragm to move the near diaphragm.

[0456] Example 201. The double diaphragm pump of example 200, further comprising a coupling that connects the shaft to the near yoke. Example 202. The double diaphragm pump comprises an off-center brace that extends from the coupling to the near yoke to resist relative rotation between the shaft and the near yoke.

[0457] Example 203. The double diaphragm pump of any one of examples 176-202, wherein in the pump section is rotatable relative to the drive section while still attached to the drive section to allow draining of the pump section.

[0458] Example 204. The double diaphragm pump of any one of examples 176-203, wherein both of the near diaphragm and the far diaphragm are dismountable from the pump section without disconnecting the pump section from the drive section.

[0459] Example 205. The double diaphragm pump of any one of examples 176-204, wherein the pump section is disconnectable from the drive section while both of the near diaphragm and the far diaphragm remain mounted to the pump section.

[0460] Example 206. A backer membrane for a diaphragm membrane configured to flex to pump fluid through a pumping chamber, the backer membrane comprising: a backer body having an outer edge formed around an axis; an aperture through a center of the backer body; at least one projection extending from a first side of the backer body; and at least one notch formed in the outer edge.

[0461] Example 207. The backer membrane of example 206, wherein the at least one projection includes a first projection and a second projection.

[0462] Example 208. The backer membrane of example 207, wherein the aperture is disposed between the first projection and the second projection.

[0463] Example 209. The backer membrane of any one of examples 206-208, wherein the at least one notch includes a first notch and a second notch.

[0464] Example 210. The backer membrane of example 209, wherein the first notch and the second notch are spaced 180-degrees apart around the backer body.

[0465] Example 211. The backer membrane of any one of examples 206-208, further comprising: a first ear projecting outward relative to the outer edge; a second ear projecting outward relative to the outer edge; a first notch of the at least one notch formed in the first ear; and a second notch of the at least one notch formed in the second ear.

[0466] Example 212. The backer membrane of any one of examples 209-211, wherein the first notch is open radially outward away from the aperture and the second notch is open radially outward away from the aperture.

[0467] While the invention has been described with reference to an exemplary embodiment(s), it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for eh the scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from the essential scope thereof. Therefore, it is intended that the invention not be limited to the particular embodiment(s) disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.

Claims

CLAIMS1. A double diaphragm pump, comprising: a fluid section comprising: a near diaphragm; a far diaphragm; a wall located directly between the near diaphragm and the far diaphragm; a near pumping chamber formed by the near diaphragm and the wall; and a far pumping chamber formed by the far diaphragm and the wall; and a drive section comprising: an electric motor that outputs rotational motion on a motor axis, the electric motor including a stator and a rotor configured to rotate on the motor axis; and a drive which converts rotational motion from the electric motor to linear motion which moves the near diaphragm and the far diaphragm; wherein the near diaphragm is disposed between the electric motor and the far diaphragm.

2. The double diaphragm pump of claim 1, wherein the near diaphragm is connected to the far diaphragm for simultaneous movement of the near diaphragm and the far diaphragm.

3. The double diaphragm pump of any one of claims 1 and 2, wherein the near diaphragm is connected to the far diaphragm by at least one guide rod extending around the near pumping chamber and the far pumping chamber.

4. The double diaphragm pump of claim 3, wherein the at least one guide rod includes a plurality of guide rods.

5. The double diaphragm pump of any one of claims 3 and 4, wherein the at least guide rod includes a first guide rod and the second guide rod.

6. The double diaphragm pump of claim 5, wherein the first guide rod is disposed on an opposite lateral side of the wall from the second guide rod.

7. The double diaphragm pump of any one of < a near yoke connected to the near diaphragm; and a far yoke connected to the far diaphragm; wherein the first guide rod and the second guide rod connect the near yoke to the far yoke.

8. The double diaphragm pump of claim 7, wherein the near yoke is disposed directly between the near diaphragm and the drive.

9. The double diaphragm pump of any one of claims 7 and 8, wherein the near yoke is directly connected to the drive.

10. The double diaphragm pump of any one of claims 7-9, wherein the near yoke and the far yoke are oriented horizontally.

11. The double diaphragm pump of any one of claims 5-10, wherein the first guide rod extends through a first guide tube and the second guide rod extends through a second guide tube.

12. The double diaphragm pump of claim 11, wherein the first guide rod does not interface with a bushing.

13. The double diaphragm pump of claim 11, wherein no bushing is disposed within either of the first guide tube or the second guide tube.

14. The double diaphragm pump of claim 11, wherein a first bushing is disposed in the first guide rod, the first bushing contacting the guide rod partially around an exterior of the first guide rod.

15. The double diaphragm pump of claim 11, wherein a first bushing is disposed in the first guide rod, and wherein the first bushing does not contact the first guide rod fully annularly around the guide rod.

16. The double diaphragm pump of any one of rod is suspended within the first guide tube.

17. The double diaphragm pump of claim 1, wherein the near diaphragm is disposed coaxially with the far diaphragm on a pump axis.

18. The double diaphragm pump of claim 17, wherein the motor axis disposed coaxially with the pump axis.

19. The double diaphragm pump of any one of claims 1, 17, and 18, wherein the drive comprises: a drive nut connected to rotor to rotate with the rotor; a screw configured to displace linearly due to rotation of the drive nut.

20. The double diaphragm pump of claim 19, wherein the screw is connected to a near yoke, the near yoke connected to the near diaphragm.

21. The double diaphragm pump of claim 20, further comprising a far yoke connected to the far diaphragm, the near yoke and the far yoke connected together.

22. The double diaphragm pump of claim 21, wherein the screw is keyed to the near yoke.

23. The double diaphragm pump of claim 22, wherein the screw includes a plurality of projections that extend into a plurality of receivers in the near yoke.

24. The double diaphragm pump of any one of claims 19-23, further comprising: a shaft extending through the screw and connected to the near yoke.

25. The double diaphragm pump of claim 24, wherein the shaft clamps the screw to the near yoke.

26. The double diaphragm pump of any one o extends axially beyond a rotor hub of the rotor in a direction along the motor axis away from the near diaphragm.

27. The double diaphragm pump of any one of claims 19-26, wherein a portion of the drive nut is disposed within the rotor.

28. The double diaphragm pump of any one of claims 19-27, wherein the screw includes a threaded portion and an unthreaded portion, the unthreaded portion disposed between the threaded portion and the near diaphragm.

29. The double diaphragm pump of any one of claims 1-28, wherein: the fluid section includes a pump housing; the near pumping chamber is formed in the pump housing; and the far pumping chamber is formed in the pump housing.

30. The double diaphragm pump of claim 29, wherein the near diaphragm is clamped to the pump housing.

31. The double diaphragm pump of claim 30, wherein the near diaphragm is clamped to the pump housing by a clamp ring connected to the pump housing.

32. The double diaphragm pump of any one of claims 29-31 , wherein the far diaphragm is clamped to the pump housing.

33. The double diaphragm pump of any one of claims 29-32, further comprising: an inlet manifold mounted to the pump housing; and an outlet manifold mounted to the pump housing.

34. The double diaphragm pump of claim 33, wherein the pump housing, the inlet manifold, and the outlet manifold are dismountable from the drive section as a single assembly.

35. The double diaphragm pump of any one o diaphragm is dismountable from the pump housing while one or both of the inlet manifold and the outlet manifold remain mounted to the pump housing.

36. The double diaphragm pump of any one of claims 33-35 , wherein the far diaphragm is dismountable from the pump housing while one or both of the inlet manifold and the outlet manifold remain mounted to the pump housing.

37. The double diaphragm pump of any one of claims 33-36, wherein a near inlet passage of the inlet manifold is fluidly connected to the near pumping chamber and a far inlet passage of the inlet manifold is fluidly connected to the far pumping chamber, and wherein the near inlet passage is axially offset from the far inlet passage.

38. The double diaphragm pump of any one of claims 33-37, wherein a near outlet passage of the outlet manifold is fluidly connected to the near pumping chamber and a far outlet passage of the outlet manifold is fluidly connected to the far pumping chamber, and wherein the near outlet passage is axially offset from the far outlet passage.

39. The double diaphragm pump of any one of claims 1-38, further comprising: a first inlet check valve preventing retrograde flow from the near pumping chamber; and a second inlet check valve preventing retrograde flow from the far pumping chamber; wherein the first inlet check valve is axially offset from the second inlet check valve.

40. The double diaphragm pump of any one of claims 1-40, further comprising: a first outlet check valve preventing retrograde flow to the near pumping chamber; and a second outlet check valve preventing retrograde flow to the far pumping chamber; wherein the first outlet check valve is axially offset from the second outlet check valve.

41. The double diaphragm pump of any one of claims 1-40, wherein the fluid section is mountable to and dismountable from the drive section as a single assembly.

42. The double diaphragm pump of any one of claims 1-41, wherein the rotor rotates in a first rotational direction to drive the near diaphragm through a pumping stroke and the far diaphragm through a suction stroke, and the rotor rotates in a second rotational direction opposite the first rotational direction to drive the near diaphragm through a suction stroke and the far diaphragm through a pumping stroke.

43. The double diaphragm pump of any one of claims 1-43, wherein the drive section includes a drive housing within which the electric motor and the drive are at least partially disposed.

44. The double diaphragm pump of claim 43, wherein a leak chamber is formed in the drive housing, the leak chamber disposed vertically below the drive.

45. The double diaphragm pump of claim 44, wherein the leak chamber is disposed vertically below the electric motor.

46. The double diaphragm pump of any one of claims 44 and 45, wherein the leak chamber comprises a chamber floor that is sloped between a first sidewall of the leak chamber and a second sidewall of the leak chamber.

47. The double diaphragm pump of claim 46, wherein the first sidewall is disposed on a first lateral side of the leak chamber and the second sidewall is disposed on a second lateral side of the leak chamber.

48. The double diaphragm pump of any one of claims 46 and 47, wherein an intersection between the chamber floor and the first sidewall is disposed vertically lower than an intersection between the chamber floor and the second sidewall.

49. The double diaphragm pump of claim 48, wherein a leak sensor is mounted to the first sidewall.

50. The double diaphragm pump of any one of claims 48 and 49, wherein a leak aperture is formed through the second sidewall.

51. The double diaphragm pump of any one of claims 46-48, wherein a leak sensor is mounted to the first sidewall, a leak aperture is formed through the second sidewall, and the leak aperture is disposed vertically above the leak sensor.

52. The double diaphragm pump of any one of claims 43-51 , wherein the drive housing includes a drive frame that supports the electric motor.

53. The double diaphragm pump of claim 52, wherein the drive frame axially overlaps with the rotor and radially overlaps with the rotor.

54. The double diaphragm pump of any one of claims 52 and 53, wherein the drive frame includes a tube that extends axially into the electric motor.

55. The double diaphragm pump of claim 54, wherein the tube does not extend fully axially through the electric motor.

56. The double diaphragm pump of any one of claims 54 and 55, wherein a rotor hub of the rotor radially overlaps with the tube both radially inward of the tube and radially outward of the tube.

57. The double diaphragm pump of any one of claims 54 and 55, further comprising: a first bearing supporting the rotor, the first bearing mounted on the tube; a second bearing supporting the rotor, the second bearing mounted on the tube.

58. The double diaphragm pump of claim 57, wherein the first bearing is disposed between a first portion of a rotor hub of the rotor disposed radially inward of the tube and a second portion of the rotor hub disposed radially outward of the tube.

59. The double diaphragm pump of claim 58, wherein the first bearing interfaces with the first portion of the rotor hub.

60. The double diaphragm pump of any one of bearing is disposed between the first portion of the rotor hub and the second portion of the rotor hub.

61. The double diaphragm pump of claim 60, wherein the second bearing interfaces with the first portion of the rotor hub.

62. The double diaphragm pump of any one of claims 57-61, wherein the first bearing extends axially outward of the stator towards the near pumping chamber.

63. The double diaphragm pump of any one of claims 57-62, wherein the first bearing is configured to react axial forces.

64. The double diaphragm pump of any one of claims 57-63, wherein the first bearing is configured as a double row bearing.

65. The double diaphragm pump of any one of claims 57-64, wherein the rotor is cantilevered from the first bearing and the second bearing in a direction axially away from the near pumping chamber.

66. The double diaphragm pump of any one of claims 57-65, further comprising: an end cap connected to the drive frame, the end cap holding the first bearing.

67. The double diaphragm pump of claim 66, wherein a linear displacer of the drive extends axially through the end cap.

68. The double diaphragm pump of claim 67, wherein an inner seal is disposed between the end cap and the linear displacer to form a sliding seal between the end cap and the linear displacer.

69. The double diaphragm pump of any one of claims 66-68, wherein an outer seal is disposed between the end cap and the drive housing to form a static seal between the end cap an the drive housing.

70. The double diaphragm pump of any out diaphragm includes: a near inner backer oriented into the near pumping chamber; a near outer backer; and a near membrane clamped between the near inner backer and the near outer backer; wherein the near membrane is keyed to one or both of the near inner backer and the near outer backer.

71. The double diaphragm pump of claim 70, wherein the near membrane is keyed to the near outer backer.

72. The double diaphragm pump of claim 71, wherein the near membrane includes a locating projection that extends into a locating aperture in the near outer backer to key the near membrane to the near outer backer.

73. The double diaphragm pump of claim 70, wherein the near membrane includes: a near inner membrane oriented into the near pumping chamber; and a near backer membrane disposed on an opposite side of the near inner membrane from the near pumping chamber.

74. The double diaphragm pump of claim 73, wherein the near backer membrane includes a locating projection that extends into a locating aperture of the near outer backer to key the near backer membrane to the near outer backer.

75. The double diaphragm pump of any one of claims 73 and 74, wherein at least one notch is formed in an outer edge of the near backer membrane, and wherein a locating pin is disposed within the notch to resist rotation of the near diaphragm.

76. The double diaphragm pump of any one of claims 1-75, wherein the far diaphragm includes: a far inner backer oriented into the far pumping chamber; a far outer backer; and a far membrane clamped between the far inner backer and the far outer backer;wherein the far membrane is keyed to one or outer backer.

77. The double diaphragm pump of claim 76, wherein the far membrane is keyed to the far outer backer.

78. The double diaphragm pump of claim 77, wherein the far membrane includes a locating projection that extends into a locating aperture in the far outer backer to key the far membrane to the far outer backer.

79. The double diaphragm pump of claim 76, wherein the far membrane includes: a far inner membrane oriented into the far pumping chamber; and a far backer membrane disposed on an opposite side of the far inner membrane from the far pumping chamber.

80. The double diaphragm pump of claim 79, wherein the far backer membrane includes a locating projection that extends into a locating aperture of the far outer backer to key the far backer membrane to the far outer backer.

81. The double diaphragm pump of any one of claims 79 and 80, wherein at least one notch is formed in an outer edge of the far backer membrane, and wherein a locating pin is disposed within the notch to resist rotation of the far diaphragm.

82. The double diaphragm pump of any one of claims 1-6, further comprising: a near yoke connected to the near diaphragm, wherein the near yoke is keyed to the near diaphragm.

83. The double diaphragm pump of claim 82, wherein the near diaphragm comprises: a near inner backer oriented into the near pumping chamber; a near outer backer; and a near membrane clamped between the near inner backer and the near outer backer; wherein the near membrane is keyed to the near outer backer and the near yoke is keyed to the near outer backer.

84. The double diaphragm pump of claim 83, w near outer backer.

85. The double diaphragm pump of any one of claims 83 and 84, wherein the near outer backer includes at least one locating aperture, the membrane includes a locating projection the extends into the at least one locating aperture, and the near yoke includes at least one yoke projection that extends into the at least one locating aperture.

86. The double diaphragm pump of claim 85, wherein: the at least one locating aperture includes a first locating aperture and a second locating aperture; the locating projection is a first locating projection that extends into the first locating aperture from a first end of the first locating aperture; the near backer membrane includes a second locating projection that extends into the second locating aperture; the at least one yoke projection includes a first yoke projection and a second yoke projection; the first yoke projection extends into the first locating aperture from a second end of the first locating aperture; and the second yoke projection extends into the second locating aperture.

Images