Actively checked multi-display assembly

Abstract

A multi-displacer assembly includes multiple fluid displacers driven in phase with respect to each other. The assembly includes multiple pumps, each pumping fluid downstream from the multi-displacer assembly. The fluid displacers of the pumps reciprocate to pump fluid while checking the flow of fluid to the other pumps among the multiple pumps.

Description

Technical Field

[0001] (Cross - reference to Related Applications) This application claims priority to U.S. Provisional Application No. 63 / 463,715, entitled "Actively Checked Multi - Piston Pump", filed on May 3, 2023, and to U.S. Provisional Application No. 63 / 626,707, entitled "Actively Checked Multi - Displacer Assembly", filed on January 30, 2024, the disclosures of which are hereby incorporated by reference in their entirety.

[0002] (Technical Field) This disclosure relates to pumping. More specifically, this disclosure relates to multi - displacer pumps.

Background Art

[0003] A multi - piston pump includes a plurality of pistons that cooperate to output a fluid flow from the pump. The pistons are driven out of phase with respect to each other. In such a pump, ball checks are used to prevent the fluid from returning to the piston cavities. The ball checks use springs to push (bias) the balls back against the ball seats. The ball checks function in relation to fluid pressure, and as the piston's downstroke generates fluid pressure, the balls are allowed to disengage from the seats and the fluid is allowed to pass towards the fluid outlet. The balls return to the seats at the end of the piston's downstroke so that the piston chamber can be refilled when the outgoing fluid pressure becomes less than the force applied by the ball check springs.

Summary of the Invention

[0004] According to one aspect of the present disclosure, a multi-displacer pumping assembly includes first and second pumps. The first pump includes a first fluid displacer configured to reciprocate along a first pump axis within a first displacer cavity for pumping fluid through a first pumping chamber. The second pump includes a second fluid displacer configured to reciprocate along a second pump axis within a second displacer cavity for pumping fluid through a second pumping chamber. The first pumping chamber is fluidically connected to the second displacer cavity to receive fluid from the second displacer cavity and to output fluid to the second displacer cavity.

[0005] In addition to or alternative aspects of the present disclosure, a multi-displacer pumping assembly includes: a first pump having a first fluid displacer configured to reciprocate along a first pump axis within a first displacer cavity for pumping fluid through a first pumping chamber; a second pump having a second fluid displacer configured to reciprocate along a second pump axis within a second displacer cavity for pumping fluid through a second pumping chamber; a first fluid chamber formed within the second displacer cavity; a second fluid chamber formed within the second displacer cavity; a common chamber formed within the second displacer cavity; a common passage extending between the first pumping chamber and the common chamber and fluidly connecting them; an inlet passage fluidly connected to the first fluid chamber for supplying fluid to the first fluid chamber; and an outlet passage fluidly connected to the second fluid chamber for supplying fluid to the second fluid chamber. The second fluid displacer is configured to fluidly connect the first pump alternately to the first fluid chamber to receive fluid flowing into the first pumping chamber, and to the second fluid chamber to output fluid.

[0006] In other additional or alternative aspects of the present disclosure, a pumping method includes: reciprocating a first fluid displacer on a first pump shaft to pump fluid from an inlet passage to an outlet passage through a first pumping chamber; reciprocating a second fluid displacer on a second pump shaft to pump fluid from an inlet passage to an outlet passage through a second pumping chamber; fluidically connecting the first pumping chamber to the inlet passage by the second fluid displacer during the filling stroke of the first fluid displacer; and fluidically connecting the first pumping chamber to the outlet passage by the second fluid displacer during the discharge stroke of the first fluid displacer.

[0007] According to yet another additional or alternative aspect of the present disclosure, a multi-displacer pumping assembly includes a first fluid displacer configured to reciprocate along a first axis within a first displacer cavity for pumping fluid through a first pumping chamber, and a second reciprocating body configured to reciprocate along a second axis within a second displacer cavity to alternately fluidize the first pumping chamber to an inlet passage so that the first pumping chamber receives fluid from an inlet passage, and to an outlet passage so that the first pumping chamber outputs fluid to an outlet passage. [Brief explanation of the drawing]

[0008] [Figure 1] This is a schematic diagram showing the flow path for a multi-display pumping assembly. [Figure 2] This is an isometric view of a multi-display pumping assembly. [Figure 3] This is a cross-sectional view along line AA in Figure 2. [Figure 4] This is a cross-sectional view along line BB in Figure 2. [Figure 5A]This is a cross-sectional view along line CC in Figure 2, showing the pump of a multi-display pumping assembly in a filled state. [Figure 5B] Figure 2 shows a cross-sectional view along line CC, illustrating the pump of a multidisplay pumping assembly in a transition state. [Figure 5C] Figure 2 shows a cross-sectional view along line CC, illustrating the pump of a multi-display pumping assembly in a distribution state. [Figure 6A] This is an isometric view of a fluid distribution assembly. [Figure 6B] This is a cross-sectional view along line BB in Figure 6A. [Modes for carrying out the invention]

[0009] This disclosure generally relates to positive displacement pumps. According to aspects of this disclosure, a multi-displacer pumping assembly includes a plurality of fluid displacers that reciprocate in phase with respect to one another to pump fluid. The multi-displacer pumping assembly includes a plurality of pumps, each containing a fluid displacer that reciprocates to pump fluid. The multi-displacer pumping assembly includes an active check, in which the fluid displacers check the passages for inflow and outflow flows from each pump. A fluid displacer in one of the pumps of the assembly provides a check for directing inflow and outflow flows to one of the other pumps of the assembly.

[0010] Unlike conventional pumps, the multi-displacer pumping assembly according to this disclosure does not require ball valves or other valves to regulate the inflow and outflow of fluid. The fluid displacers of the multiple pumps in the assembly perform fluid checks for the others among the multiple pumps. According to aspects of this disclosure, each individual pump includes a pumping chamber through which its fluid displacer pumps fluid. The multiple pumps are fluidically connected to one another such that one pump receives fluid from another and outputs fluid to another. The pumps are fluidically connected such that one pump pumps through the displacer chambers of the other pumps. The pumping chamber of the first pump is fluidically connected to the second pump by a fluid path between the first and second pumps. The fluid path directs the fluid from the first flow chamber of the second pump to the pumping chamber of the first pump and then to the second flow chamber of the second pump. The first and second flow chambers are fluidically connected to the inflow and outflow passages of the multi-displacer pumping assembly. The fluid displacer of the second pump fluidically isolates the flow chamber. The fluid displacer of the second pump reciprocates to simultaneously pump fluid through the pumping chamber of the second pump and alternately fluidically connect the pumping chamber of the first pump to the first and second flow chambers of the second pump.

[0011] The fluid displacer of a pump in a multi-displacer pumping assembly is configured to maintain fluid separation between the flow chambers of that pump. The fluid displacer may include a chamber connector configured to fluidly connect the pumping chamber of another pump to its flow chamber. The chamber connector may be formed on the outside of the fluid displacer, inside the fluid displacer, or a combination of both.

[0012] The fluid distribution device includes a multi-displacer pumping assembly with active checks. Active checks may be provided by the positioning of the fluid displacers relative to the inlet and outlet ports along the displacer cavity. The fluid displacers may have at least two diameters: (i) a diameter narrower than the displacer cavity (allowing fluid flow into and from the displacer cavity), and (ii) a diameter substantially the same as the coaxial diameter of the displacer cavity (i.e., a diameter preventing fluid from leaving the displacer cavity). Multiple fluid displacers have cross-porting between selected fluid displacers.

[0013] The fluid displacers of the multiple pumps in a multi-displacer pumping assembly may be driven in phase with respect to each other. Driving the fluid displacers in phase with respect to each other facilitates continuous flow from the multi-displacer pumping assembly. According to aspects of this disclosure, the fluid displacers may be driven by a drive mechanism such as a rocking drive, a cam drive, or a suitable drive train that enables phasing of the multiple fluid displacers. In some examples, a multi-displacer pumping assembly with active checks may be used for fluid metering, such as liquid distribution in the liquid finishing market. In some examples, a multi-displacer pumping assembly with active checks may be driven in reverse with compressed air to function as an air motor (i.e., output rotational force).

[0014] Components are considered to overlap radially when they are positioned in a common axial position along the axis. Radial lines extending from the axis pass through each of the radially overlapping components. Components are considered to overlap axially when they are positioned in common radial and circumferential positions with respect to the axis such that axial lines parallel to the axis pass through the axially overlapping components. Components are considered to overlap circumferentially when they are aligned around the axis such that a circle centered on the axis passes through the circumferentially overlapping components.

[0015] Figure 1 is a schematic diagram of a multi-display pumping assembly 10. The multi-piston pumping assembly includes pumps 12a-12d (collectively referred to here as "pumps 12"), an inlet passage 22, and an outlet passage 24. Each pump 12 includes a pumping chamber 14, an inlet chamber 16, and an outlet chamber 18. A common passage 20 extends between the pumps 12.

[0016] The multi-displacer pumping assembly 10 is configured to pump fluid for distribution onto a substrate. For example, the multi-displacer pumping assembly 10 may be configured to distribute high-viscosity fluids (e.g., sealants, adhesives, foams, gasket materials, among other options). In some examples, the multi-piston pump 12 may be configured to generate an outlet fluid pressure sufficient to cause fluid atomization at the nozzle outlet. This allows the system to be used in airless spray applications, such as those disclosed in U.S. Patent No. 9,914,141 ('141 Patent) and U.S. Publication No. 2017 / 0165692, the disclosures of which are incorporated herein by reference in their entirety.

[0017] The multi-displacer pumping assembly 10 includes an active check, where fluid check is provided by a part of the pump drivetrain, typically a part of the fluid displacer itself relative to the pump body. In some examples, the active check is provided by a fluid displacer (e.g., via different diameters along a selected length of the piston) blocking the inlet port (at a specific phase) and the outlet port (at a specific phase). The active check can provide a more precise fluid distribution (e.g., a more precise dosage). The active check can also provide a smoother fluid flow by eliminating vibrations caused by a ball returning to its seat to close a flow path in an assembly including a ball check valve.

[0018] Pumps 12a-12d are fluidically connected to an inlet path 22. The inlet path 22 provides fluid flow to each of the pumps 12a-12d. Pumps 12a-12d are fluidically connected to a common inlet path 22. In some examples, fluid may be supplied to the multidisplay pumping assembly 10 under pressure so that the fluid path 22 provides a pressurized inlet to the multidisplay pumping assembly 10. Pumps 12a-12d are also fluidically connected to an outlet path 24. The outlet path 24 receives the fluid output by each of the pumps 12a-12d. Pumps 12a-12d are fluidically connected to a common outlet path 24. The multidisplay pumping assembly 10 may be configured to receive a common inlet and output a common outlet. In some examples, the multidisplay pumping assembly 10 may be configured to output the pumped fluid at a pressure lower than the inlet pressure of the fluid.

[0019] Pumps 12a - 12d include a fluid displacer that reciprocates to pump fluid and is configured to provide an active check against other ones of the pumps 12. The fluid displacer may be configured as a piston, a plunger, etc. In this disclosure, the fluid displacer may be referred to as a piston, but such description is understood to be equally applicable to plunger - type pumps. The fluid displacer is reciprocated through a pump cycle. Each pump cycle includes a first stroke in a first direction along the reciprocation axis of the fluid displacer and a second stroke in a second direction along the reciprocation axis of the fluid displacer. The first stroke may increase the volume of the pumping chamber 14 so that fluid is drawn into the pumping chamber 14. The second stroke may decrease the volume of the pumping chamber 14 so that fluid is output out of the pumping chamber 14.

[0020] The inlet chamber 16 of each pump 12a - 12d is fluidly connected to the inlet path 22. The inlet chamber 16 may be at least partially defined by the fluid displacer of the pump 12. The inlet chamber 16 may be formed within a displacer cavity of the pump 12 where the fluid displacer of the pump 12 reciprocates internally. The inlet chamber 16 receives the inflow from the inlet path 22. The outlet chamber 18 of each pump 12a - 12d is fluidly connected to the outlet path 24. The outlet chamber 18 may be at least partially defined by the fluid displacer of the pump 12. The outlet chamber 18 may be formed within a displacer cavity of the pump 12 where the fluid displacer of the pump 12 reciprocates internally. The outlet chamber 18 is configured to provide an outflow to the outlet path 24. The inlet chamber 16 and the outlet chamber 18 are maintained in a fluidically separated state through operation by the fluid displacer of the pump 12.

[0021] The multi-displacement pumping assembly 10 is understood to be configured for a bi-directional flow. For example, when driving the fluid displacer to reciprocate in a first direction, the inlet passage 22 can supply fluid to the multi-displacement pumping assembly 10 such that the fluid is output through the outlet passage 24. By driving in a second opposite direction, the multi-displacement pumping assembly 10 can pump fluid from the outlet passage 24 to the inlet passage 22 such that the outlet passage 24 supplies fluid to the pumps 12a-12d and the inlet passage 22 receives the fluid output by the pumps 12a-12d. The inlet passage 22 and the outlet passage 24 may be referred to as the pumping passages of the pump 12 because either one of the inlet passage 22 and the outlet passage 24 can supply fluid to the pumps 12a-12d or receive fluid from the pumps 12a-12d.

[0022] The pumping chambers 14 are formed inside each of the pumps 12a-12d. The fluid displacers of the pumps 12a-12b reciprocate on a reciprocating shaft and pump fluid through the pumping chambers 14. The pumping chambers 14 can be defined, at least in part, by a fluid displacer and a displacer cavity in which the fluid displacer reciprocates internally.

[0023] A common passage 20 extends between the various pumps 12a-12d of the multi-piston pumping assembly 10, fluidly connecting them. The common passage 20 fluidly connects the inlet chamber 16 and outlet chamber 18 of one pump 12 to the pumping chamber 14 of another pump 12. In the illustrated example, common passage 20a extends between the inlet chamber 16 and outlet chamber 18 of pump 12a and the pumping chamber of pump 12b. Common passage 20b extends between the inlet chamber 16 and outlet chamber 18 of pump 12b and the pumping chamber 14 of pump 12c. Common passage 20c extends between the inlet chamber 16 and outlet chamber 18 of pump 12c and the pumping chamber 14 of pump 12d. Common passage 20d extends between the inlet chamber 16 and outlet chamber 18 of pump 12d and the pumping chamber 14 of pump 12a.

[0024] In the illustrated example, the common passage 20 is shown branching to connect to the inlet chamber 16 and the outlet chamber 18. In some examples, the common passage 20 extends to a single port into the displacer cavities of pumps 12a-12d, which is understood to be fluidly connected alternately to the inlet chamber 16 and the outlet chamber 18 by the fluid displacers of pumps 12a-12d.

[0025] During operation, pumps 12a-12d operate in phase-shifted manner so that the fluid displacer of pump 12 is in different positions relative to the other fluid displacers throughout their respective pump strokes. Fluid is supplied to the multi-displacer pumping assembly 10 from an upstream fluid supply that may be pressurized. The fluid flows through the inlet path 22 into the inlet chambers 16 of pumps 12a-12d.

[0026] In the case of pump 12a, the fluid displacer of pump 12d fluidly connects the inlet chamber 16 of pump 12d to the common passage 20 when the fluid displacer of pump 12a is at or near the end of the discharge stroke in which fluid is discharged from the pumping chamber 14 of pump 12a. The piston of pump 12a begins to move through the filling stroke, and fluid flows from the inlet chamber 16 of pump 12d through the common passage 20 between pump 12d and pump 12a into the pumping chamber of pump 12a. The piston of pump 12a reverses after the filling stroke and begins the discharge stroke. The piston of pump 12d shifts so as to fluidly disconnect the inlet chamber 16 of pump 12d from the pumping chamber 14 of pump 12a and fluidly connect the outlet chamber 18 of pump 12d to the pumping chamber 14 of pump 12a. The fluid displacer of pump 12a pushes the fluid from the pumping chamber 14 through the common passage 20d to the outlet chamber 18 of pump 12d. The fluid is then output to the outlet path 24. In some examples, the fluid displacer of pump 12d may be considered to form a shuttle valve for directing the fluid back to the pumping chamber 14 of pump 12a.

[0027] As described above, pump 12a operates, and it is understood that pumps 12b-12d operate in a similar or comparable manner. In the illustrated example, pump 12b is configured to receive fluid from the inlet chamber 16 of pump 12a and output fluid through the outlet chamber 18 of pump 12a, pump 12c is configured to receive fluid from the inlet chamber 16 of pump 12b and output fluid through the outlet chamber 18 of pump 12b, and pump 12d is configured to receive fluid from the inlet chamber 16 of pump 12c and output fluid through the outlet chamber 18 of pump 12c.

[0028] While the multi-displacer pumping assembly 10 is described as having each pump 12 performing both fluid transfer and active checking, it is understood that not all examples are limited in this way. In some examples, a first subset of pumps 12 performs fluid transfer, and a second subset of pumps 12 provides active checking to the first subset of pumps 12. For example, the reciprocating body of pump 12a (e.g., piston, plunger, etc.) may be configured to pump fluid through the pumping chamber 14 of pump 12a, and the reciprocating body of pump 12d may be configured to provide active checking to pump 12a without transferring fluid. Pump 12c may be configured to pump fluid through the pumping chamber 14 of pump 12c, and pump 12b may be configured to provide active checking to pump 12c without transferring fluid. In such examples, pumps 12a, 12c form a first subset that performs fluid transfer, and pumps 12b, 12d form a second subset that performs active checking.

[0029] The multi-displacer pumping assembly 10 offers significant advantages. The fluid displacer of pump 12 functions to fluidly connect and disconnect the pumping chambers 14 of the other pumps 12 to the inlet path 22 and the outlet path 24. The fluid displacer further reciprocates to pump the fluid. Thus, the fluid displacer performs a dual operation by providing an active check for the flow of the other pumps 12 and providing pumping to the fluid displacer pump 12. The fluid displacer may operate in phase-shifted manner to output fluid to the outlet path 24 at any time when at least one of the pumps 12 is operating, thereby providing a stable and continuous outflow from the multi-displacer pumping assembly 10.

[0030] The multi-disperser pumping assembly 10 can be used across multiple dispensing operations and for multiple purposes. For example, the multi-disperser pumping assembly 10 may be configured for dispensing high-viscosity fluids (e.g., sealants, adhesives, foams, or gasket materials, but not limited to these). In some examples, the multi-disperser pumping assembly 10 is configured to generate an outlet fluid pressure sufficient to produce fluid atomization at a nozzle outlet (not shown), thereby allowing the system to be used in airless spray applications. In some examples, the multi-disperser pumping assembly 10 may be used as a meter (i.e., a dosing pump) such as a fluid meter (or dosing pump) used in a liquid proportioner. In some examples, the multi-disperser pumping assembly is not used as a fluid pump but as an air motor to generate rotational force (or multiple stepped linear forces if not coupled to a drive) when driven in the reverse direction by compressed air.

[0031] Figure 2 is an isometric view of the multi-disperser pumping assembly 10. Figure 3 is a cross-sectional view along line 3-3 in Figure 2. Figure 4 is a cross-sectional view along line 4-4 in Figure 2. Figure 5A is a cross-sectional view along line 5-5 in Figure 2 showing the pump 12 of the multi-disperser pumping assembly 10 in a filled state. Figure 5B is a cross-sectional view along line 5-5 in Figure 2 showing the pump 12 of the multi-disperser pumping assembly 10 in a transition state. Figure 5C is a cross-sectional view along line 5-5 in Figure 2 showing the pump 12 of the multi-disperser pumping assembly 10 in a dispensing state. Figures 2-5C are described together with continued reference to Figure 1. The multi-disperser pumping assembly includes a drive unit 26, a plurality of pumps 12, pump paths 28a (best seen in Figure 3A), pump paths 28b (best seen in Figure 3B), and an assembly body 30. Pumps 12a-12d each include a pumping chamber 14, a flow chamber 32a, a flow chamber 32b, a fluid displacer 34, a displacer cavity 36, a pump body 38, a pump cage 40, chamber cages 42a, 42b, pump seals 44a, 44b, and routing seals 46a, 46b. A common passage 20 extends between the pumps 12.

[0032] Pumps 12a and 12b and the common passage 20 between them are shown in Figures 5Aa-5C, but the active check and flow path are understood to be the same between each pump 12a-12d, as described above with respect to Figure 1.

[0033] The assembly body 30 supports the other components of the multi-display pumping assembly 10. In the illustrated example, each pump 12 includes a different pump body 38, and various pump bodies 38 are combined to form the assembly body 30. The pump bodies 38 can be fastened, for example, by bolts or other fasteners. However, it is understood that the assembly body 30 can be formed in any desired manner. For example, the assembly body 30 can be formed monolithically, among other options.

[0034] For each pump 12, the fluid displacer 34 is located at least partially within the assembly body 30. The fluid displacer 34 is elongated along the reciprocating axis RA. The fluid displacer 34 may be configured as a piston, plunger, or other type of fluid transfer device.

[0035] The fluid displacer 34 is connected to the drive unit 26 to receive reciprocating input from the drive unit 26. In the illustrated example, the drive unit 26 is formed as an oscillating drive unit, but other configurations are understood to be possible. Rotational input for the oscillating drive unit (or a similar drive unit, e.g., a cam) can be provided by various motors, as described in paragraph

[0050] of U.S. Patent Application Publication No. 2017 / 0165692, assigned to Graco Minnesota Inc. The disclosures of U.S. Patent Application Publication No. 2017 / 0165692 are incorporated by reference in their entirety. The drive unit 26 is configured to drive the fluid displacer 34 of the pump 12 in phase with respect to each other. The drive unit 26 may be connected to a drive shaft that provides rotational input to the drive unit 26. The drive unit 26 is configured to convert its rotational input into reciprocating linear motion and provide it to the fluid displacer 34 to move it, causing pumping by the multi-displacer pumping assembly 10.

[0036] Pump paths 28a and 28b are formed within the assembly body 30. One of the pump paths 28a and 28b provides an inflow passage (e.g., inflow path 22 (Figure 1)) for the multidisplacer pumping assembly 10, and the other of the pump paths 28a and 28b provides an outflow passage (e.g., outflow path 24 (Figure 1)) for the multidisplacer pumping assembly 10. In the illustrated example, each displacer cavity 36 is fluidically connected to both pump paths 28a and 28b such that each pump 12 receives inflow from a common flow path and outputs outflow to the common flow path. When the drive unit 26 is rotated in a first rotational direction, the pump 12 draws in fluid through pump path 28a and outputs fluid through pump path 28b. When the drive unit 26 is rotated in a second rotational direction opposite to the first rotational direction, the pump 12 draws in fluid through pump path 28b and outputs fluid through pump path 28a.

[0037] Pump path 28a is fluidically connected to the displacement cavity 36 of each pump 12a-12d. Therefore, pump path 28a can supply fluid to each pump 12a-12d or receive fluid from each pump 12a-12d. Pump path 28a is fluidically connected to the flow chamber 32a of each pump 12. Pump path 28b is fluidically connected to the displacement cavity 36 of each pump 12a-12d. Therefore, pump path 28b can supply fluid to each pump 12a-12d or receive fluid from each pump 12a-12d. Pump path 28b is fluidically connected to the flow chamber 32b of each pump 12.

[0038] The pump cage 40 is located at least partially within the displacer cavity 36. The pump cage 40 includes an opening that allows fluid to pass through the pump cage 40. The pump cage 40 defines at least partially the pumping chamber 14. The chamber cage 42a is located within the displacer cavity 36. The chamber cage 42a is located within the displacer cavity 36. The chamber cage 42a includes an opening that allows fluid to pass through the chamber cage 42a. The chamber cage 42a defines at least partially the flow chamber 32a. The chamber cage 42b is located within the displacer cavity 36. The chamber cage 42b includes an opening that allows fluid to pass through the chamber cage 42b. The chamber cage 42b defines at least partially the flow chamber 32b.

[0039] The fluid displacer 34 of each pump 12 is configured to reciprocate within the displacer cavity 36 of that pump 12. The fluid displacer 34 may also be referred to as a reciprocating body. In some examples, the pump 12b may not include a pumping chamber 14, and instead the fluid displacer 34 of the pump 12b is configured to reciprocate to provide an active check to the pump 12a, but it is understood that it does not pump fluid through the fluid chamber. In some such examples, the pump 12a may perform fluid displacement without providing an active check, such that the pump 12a does not include a flow chamber 32a, 32b, a common chamber 33, or a corresponding sealing element.

[0040] The fluid displacer 34 interacts with various seals within the displacer cavity 36 to divide the displacer cavity 36 into multiple chambers and route the fluid. In the illustrated example, the pump seal 44a interacts with the fluid displacer 34 and defines at least partially the flow chamber 32a. The pump seal 44a is configured to engage and seal with the fluid displacer 34 throughout operation. The pump seal 44a is configured to prevent fluid from leaking from the pump body 38 between the fluid displacer 34 and the pump body 38. The pump seal 44a is a dynamic seal in that the fluid displacer 34 moves relative to the pump seal 44a during operation while maintaining a sealed interface with the pump seal 44a.

[0041] The pump seal 44b is located within the pump body 38. The pump seal 44b interacts with the fluid displacer 34 and defines at least partially the pumping chamber 14. In the illustrated example, the pump seal 44b also defines at least partially the flow path 32b. The pump seal 44b is configured to engage and seal with the fluid displacer 34 throughout operation. The pump seal 44b is configured to prevent fluid leakage between the pumping chamber 14 and the flow chamber 32b. The pump seal 44b is a dynamic seal in that the fluid displacer 34 moves relative to the pump seal 44b during operation while maintaining a sealed interface with the pump seal 44b.

[0042] Each routing seal 46a, 46b engages with the fluid displacer 34 during a specific phase of operation and disengages from the fluid displacer 34 during other phases of operation. In the illustrated example, at least one of the routing seals 46a, 46b seals with the fluid displacer 34 throughout operation. Routing seal 46a is located between the flow chamber 32a and the common chamber 33. The fluid displacer 34 engages with routing seal 46a to fluidically isolate the flow chamber 32a and the common chamber 33. Routing seal 46b is located between the flow chamber 32b and the common chamber 33. The fluid displacer 34 engages with routing seal 46b to fluidically isolate the flow chamber 32b and the common chamber 33. Pump 12 is configured to provide an active check to other pumps 12 by having the fluid displacer 34 engage with and disengage from the routing seals 46a, 46b.

[0043] In the illustrated example, the fluid displacer 34 is separated from the routing seal 46a to fluidly connect the flow chamber 32a and the common chamber 33. The fluid displacer 34 is configured to engage with the routing seal 46b to fluidly isolate the flow chamber 32b and the common chamber 33 when the fluid displacer 34 is separated from the routing seal 46a to fluidly connect the flow chamber 32a and the common chamber 33.

[0044] In the illustrated example, the fluid displacer 34 is separated from the routing seal 46b to fluidly connect the flow chamber 32b and the common chamber 33. The fluid displacer 34 is configured to engage with the routing seal 46a to fluidly isolate the flow chamber 32a and the common chamber 33 when the fluid displacer 34 is separated from the routing seal 46b to fluidly connect the flow chamber 32b and the common chamber 33.

[0045] The fluid displacer 34 includes a chamber connector 35 configured to route fluid between the flow chambers 32a, 32b and the common chamber 33. In the illustrated example, the chamber connector 35 is formed as a reduced-diameter portion of the fluid displacer 34 compared to the portion that seals with the routing seals 46a, 46b.

[0046] In the illustrated example, the chamber connector 35 is formed as an undercut on the outside of the fluid displacer 34. In the illustrated example, the chamber connector 35 extends completely annularly around the fluid displacer 34. At multiple locations along the chamber connector 35, the fluid displacer 34 has a smaller cross-sectional area perpendicular to the reciprocating axis Ra of the fluid displacer 34 than the portion of the fluid displacer 34 that engages with the pump seals 44a, 44b or the routing seals 46a, 46b. It is understood that the chamber connector 35 may be any suitable configuration for selectively fluidically connecting the common chamber 33 and the flow chambers 32a, 32b. For example, the chamber connector 35 may be formed by one or more grooves on the outside of the piston, one or more passages formed at least partially within the fluid displacer 34, or a combination thereof, or may be any other suitable configuration for selectively fluidically connecting the common chamber 33 and the flow chambers 32a, 32b.

[0047] The common passage 20 extends between the displacement cavities 36 of the fluidically connected pumps 12. The common passage 20 between pumps 12a and 12b is shown in Figures 5A-5C. The common passage 20 fluidly connects the common chamber 33 of pump 12a to the pumping chamber 14 of pump 12b. Pump 12b is configured to receive fluid into its pumping chamber 14 through the common passage 20 and to output fluid from its pumping chamber 14 through the common passage 20.

[0048] In the illustrated example, the common passage 20 includes branched passages 48a, 48b and ports 50a, 50b. Port 50a opens to the common chamber 33 of pump 12a. Port 50b opens to the pumping chamber 14 of pump 12b. The branched passages 48a, 48b extend between ports 50a, 50b and fluidly connect them. Although the common passage 20 is shown as including the branched passages 48a, 48b, it is understood that the common passage 20 may be configured as a single passage that does not include the branched passages 48a, 48b.

[0049] In the illustrated example, flow valves 52a and 52b are located in the common passage 20. Flow valves 52a and 52b are formed as check valves configured to allow unidirectional flow through them. Flow valve 52a is located in the branch passage 48a. Flow valve 52a is configured to facilitate unidirectional flow through the branch passage 48a. Flow valve 52b is located in the branch passage 48b. Flow valve 52b is configured to facilitate unidirectional flow through the branch passage 48b. Flow valves 52a and 52b facilitate first-in, first-out pumping by pump 12. The common passage 20 is shown as including flow valves 52a and 52b, but it should be understood that not all examples are limited in this way. For example, flow valves 52a and 52b may be omitted in various examples. The flow valves 52a and 52b do not provide checks on the inflow and outflow of fluid into the pumping chamber 14, but instead promote a first-in, first-out flow. The fluid displacer 34 performs checks on the inflow and outflow of fluid.

[0050] The pump cycle of pump 12b will be described in more detail. The pump cycle of pump 12b describes the pumping by each pump 12 of the multi-piston pumping assembly 10 and is understood to be applicable to any of the multiple pumps 12. The pump cycle includes the fluid displacer 34 moving a first stroke in a first axial direction AD1 along the reciprocating axis RA, and the fluid displacer 34 moving a second stroke in a second axial direction AD2 along the reciprocating axis. The first stroke may also be referred to as the up stroke, filling stroke, or suction stroke. The second stroke may also be referred to as the discharge stroke, down stroke, or pressure stroke. Pump 12 is configured to draw in fluid during the first stroke and to output fluid during the second stroke.

[0051] Pump 12a provides an active check to pump 12b, routing fluid to and from the pumping chamber 14 of pump 12b. The fluid displacer 34 of pump 12a pumps fluid through the pumping chamber 14 of pump 12a and routes the fluid to and from pump 12b. Similarly, and as described above, the fluid displacer 34 of pump 12b pumps fluid through the pumping chamber 14 of pump 12b and routes the fluid to and from pump 12c, the fluid displacer 34 of pump 12c pumps fluid through the pumping chamber 14 of pump 12c and routes the fluid to and from pump 12d, and the fluid displacer 34 of pump 12d pumps fluid through the pumping chamber 14 of pump 12d and routes the fluid to and from pump 12a.

[0052] The fluid displacer 34 of pump 12a is considered to form the valve of pump 12b and the fluid transfer device of pump 12a. Therefore, the fluid displacer 34 of each pump 12 routes the fluid to the other pumps 12 of the multi-displacer pumping assembly 10 and pumps the fluid.

[0053] For the sake of discussion, we assume that pump path 28a is configured as an inlet path 22 through which fluid is supplied to pump 12, and that pump path 28b is configured as an outlet path 24 through which fluid is output from pump 12. Therefore, for the sake of discussion, flow chamber 32a forms an inlet chamber 16, and flow chamber 32b forms an outlet chamber 18.

[0054] Pump 12b is shown in the filled state in Figure 5A, and is fluidically connected to the pump path 28a to receive the inflow of fluid. The fluid displacer 34 of pump 12b is moving its filling stroke in the first axial direction AD1 in Figure 5A. The fluid displacer 34 of pump 12a is engaged with and disengaged from the routing seal 46b. The chamber connector 35 of pump 12a is radially overlapping with the routing seal 46a such that the reduced diameter portion of the fluid displacer 34 of pump 12a is aligned with the routing seal 46a. The radial overlap of the chamber connector 35 with the routing seal 46a forms a flow path between the fluid displacer 34 and the routing seal 46a, allowing fluid to flow from the flow chamber 32a to the common chamber 33 in the displacer cavity 36 of pump 12a.

[0055] The fluid displacer 34 of pump 12a engages with the routing seal 46b, fluidly isolating the flow chamber 32b and common chamber 33 within pump 12a so that the pumping chamber 14 of pump 12b is fluidly disconnected from the pump path 28b. The fluid displacer 34 of pump 12a disengages from the routing seal 46b so that the flow chamber 32a and common chamber 33 of pump 12a are fluidly connected so that the pumping chamber 14 of pump 12b is fluidly connected to the pump path 28a.

[0056] The fluid displacer 34 of pump 12b moves its filling stroke in the first axial direction AD1. The fluid flows from the pump path 28a through the flow chamber 32a and common chamber 33 of pump 12a, and then through the common passage 20 to the pumping chamber 14 of pump 12b. In the illustrated example, the check valve 62b prevents the fluid from flowing into the pumping chamber 14 of pump 12b through the branch path 48b. Instead, the fluid flows through the check valve 62a and the branch path 48a. Such a configuration facilitates that any fluid remaining in the branch path 48a between the check valve 62a and the pumping chamber 14 becomes the first fluid to flow into the pumping chamber 14.

[0057] The fluid displacer 34 of pump 12b continues to shift its filling stroke until it reaches the end of the filling stroke. While the fluid displacer 34 of pump 12b is moving its upward stroke, the fluid displacer 34 of pump 12a completes its filling stroke and begins to move its discharge stroke. The fluid displacer 34 of pump 12a moves downward in the second axial direction AD2, as shown in Figure 5B, and re-engages with the routing seal 46a. The pumping chamber 14 of pump 12b is fluidly isolated from both the flow chamber 32a and the flow chamber 32b while the fluid displacer 34 of pump 12a is engaged with both the routing seal 46a and the routing seal 46b.

[0058] The fluid displacer 34 of pump 12a engages with the routing seal 46b before disengaging from it, fluidly connecting pump 12b to the flow chamber 32b of pump 12a. Crossflow between pump paths 28a, 28b is prevented by ordering the seal engagements such that the fluid displacer 34 re-engages with both routing seals 46a, 46b before disengaging from either of them. The fluid displacer 34 remains seal-engaged with at least one of the routing seals 46a, 46b throughout the entire pump stroke.

[0059] The fluid displacer 34 of pump 12a continues to shift throughout the discharge stroke, as shown in Figure 5C, moving away from the routing seal 46b. The chamber connector 35 of pump 12a radially overlaps the routing seal 46b such that the reduced-diameter portion of the fluid displacer 34 of pump 12a aligns with the routing seal 46b. The radial overlap of the chamber connector 35 with the routing seal 46b creates a flow path between the fluid displacer 34 and the routing seal 46ab, allowing fluid to flow from the common chamber 33 to the flow chamber 32 within the displacer cavity 36 of pump 12a. In this way, pump 12b is placed in a discharge state, where it is fluidically connected to the pump path 28b, which forms the discharge path 24.

[0060] As the fluid displacer 34 of pump 12a moves away from the routing seal 46b, the common chamber 33 of pump 12a is fluidically connected to the flow chamber 32b of pump 12a. This fluidically connects the pumping chamber 14 of pump 12b to the flow chamber 32b and, therefore, to the pump path 28b. The fluid displacer 34 of pump 12b moves through the discharge stroke in the second axial direction AD2. The fluid displacer 34 of pump 12b drives fluid from the pumping chamber 14 through the common passage 20 and the common chamber 33, through the flow chamber 32b, and into the pump path 28b. In the illustrated example, a check valve 62a prevents fluid from flowing from the pumping chamber 14 of pump 12b to the common chamber 33 of pump 12a through the branch path 48a. Instead, the fluid flows through the check valve 62b and the branch path 48b. Such a configuration facilitates the fluid in the pumping chamber 14 to first flow out of the pumping chamber 14 into the common chamber 33, providing a first-in, first-out flow.

[0061] The flow valves 52a and 52b facilitate a first-in, first-out flow for the pump 12. The flow valves 52a and 52b are configured so that fluid enters the pumping chamber 14 through one branch path 48a and 48b and exits the pumping chamber 14 through the other branch path 48a and 48b. In this way, the fluid is routed through the circuit to flow in one direction between the common chamber 33 and the pumping chamber 14. The one-way flow in each branch path 48a and 48b prevents fluid from accumulating in the multi-piston pumping assembly 10, thereby preventing pack-out and other problems that may occur due to stagnant fluid.

[0062] While the fluid displacer 34 of pump 12b moves through its discharge stroke, the fluid displacer 34 of pump 12a completes its discharge stroke and reverses to begin its filling stroke. The fluid displacer 34 of pump 12a moves through its filling stroke and re-engages with the routing seal 46b. By re-engaging the fluid displacer 34 of pump 12a with the routing seal 46b, the pumping chamber 14 of pump 12b is fluidly disconnected from the flow chamber 32b of pump 12a. The fluid displacer 34 of pump 12b completes its discharge stroke and reverses to begin its rising stroke. The fluid displacer 34 of pump 12a continues its rising stroke, moving away from the routing seal 46a and fluidly reconnecting the pumping chamber 14 of pump 12b to the flow chamber 32a of pump 12a.

[0063] During operation, each fluid displacer 34 is in contact with the fluid pumped by its own pump 12 and other pumps. As shown in Figures 5A-5C, the fluid displacer 34 of pump 12a is in contact with the fluid in the pumping chamber 14 of pump 12a and pumps that fluid. The fluid displacer 34 of pump 12a is also in contact with the fluid routed toward and from pump 12b. While the fluid displacer 34 of pump 12a is in contact with the fluid pumped by pump 12b, the fluid displacer 34 of pump 12a does not pump that fluid. Instead, the fluid displacer 34 of pump 12a provides an active check to route the fluid toward and from the pumping chamber 14 of pump 12b.

[0064] In the illustrated example, the pumping chamber 14, flow chambers 32a, 32b, and common chamber 33 within the pump 12 are arranged coaxially along the reciprocating axis RA of the pump 12. The common chamber 33 is located axially between the flow chambers 32a and 32b. In the case of a single pump 12, the common chamber 33 can be fluidically isolated from both flow chambers 32a and 32b during certain operating phases and fluidly connected to either one of the flow chambers 32a or 32b during other operating phases. In the case of a single pump 12, the pumping chamber 14 is fluidly isolated from the flow chambers 32a, 32b, and common chamber 33 of the pump 12 throughout its operation.

[0065] The multi-displacer pumping assembly 10 offers significant advantages. Each pump 12's fluid displacer 34 pumps the fluid through the multi-displacer pumping assembly 10 while also providing an active check to one of the other pumps 12 in the multi-displacer pumping assembly 10. The fluid displacer 34 providing an active check to the other pumps 12 reduces the number of parts by eliminating the check valve that was previously required to check the flow of fluid to and / or from the pumping chamber 14.

[0066] The fluid displacers 34 of the multi-displacer pumping assembly 10 are arranged such that at least one of the pumps 12 of the multi-displacer pumping assembly 10 outputs a fluid flow through operation. The multi-displacer pumping assembly 10 thereby provides a continuous flow. The multi-displacer pumping assembly 10 provides a uniform flow, which is particularly advantageous for applying fluid at a constant flow rate. For example, the multi-displacer pumping assembly 10 can be used to output a bead of material of a desired size, such as an adhesive bead.

[0067] While a multi-displacer pumping assembly 10 with four fluid displacers 34 and a 90-degree phase difference is shown, it is understood that other numbers of fluid displacers 34 and their corresponding phases are also possible. The multi-displacer pumping assembly 10 may include any desired number of fluid displacers 34. In some examples, the multi-displacer pumping assembly 10 consists of pumps 12 in multiples of four, e.g., four fluid displacers 34, eight fluid displacers 34, twelve fluid displacers 34, etc. It is understood that increasing the number of pumps 12 and the corresponding fluid displacers 34 can provide a smoother and more uniform fluid output. Such changes in the number of fluid displacers 34 and the phase between pumps 12 may require changes in the relative positions of the pump paths 28a, 28b and / or the lengths of the fluid displacers 34, which enable or hinder the movement of fluid.

[0068] The flow valves 52a and 52b facilitate unidirectional flow through the common passage 20. The common passage 20, having branched passages 48a and 48b and flow valves 52a and 52b, provides first-in, first-out flow from the pumping chamber 14. First-in, first-out flow prevents fluid from accumulating within the multi-piston pumping assembly 10, thus preventing pack-out and other harmful effects due to such residual fluid.

[0069] Figure 6A is a side view of the fluid distribution system 54. Figure 6B is a cross-sectional view along line BB in Figure 6A. Figures 6A and 6B are described together. The fluid distribution system 54 includes a dispenser housing 56, a motor 58, a multi-dispenser pumping assembly 10, and a distribution assembly 60. The drive unit 26 and assembly body 30 of the multi-dispenser pumping assembly 10 are shown. The distribution assembly 60 includes a valve 62.

[0070] Motor 58, which could be an electric motor such as a servo motor among other options, is connected to the drive unit 26. Motor 58 is configured to generate a rotational output that is supplied to the drive unit 26. The drive unit 26 is rotated by motor 58, causing pumping by the multidisplacer pumping assembly 10. The distribution assembly 60 is connected to the multidisplacer pumping assembly 10 and receives the outflow from the multidisplacer pumping assembly 10. Valve 62 operates between an open state, which allows fluid to be released from the distribution assembly 60, and a closed state, which prevents fluid from being released from the distribution assembly 60. In the illustrated example, the fluid distribution system 54 is configured for distributing a high-viscosity fluid (e.g., sealant, adhesive, foam, or gasket material, but not limited to).

[0071] While the present invention has been described with reference to exemplary embodiments, it will be understood by those skilled in the art that various modifications can be made without departing from the scope of the invention, and that equivalents can be used in place of elements. In addition, many modifications can be made without departing from its essential scope to adapt specific situations or materials to the teachings of the invention. Thus, it is intended that the invention may include all embodiments contained in the appended claims, rather than being limited to the specific embodiments disclosed herein. Any single feature shown herein, or any combination of features from one embodiment, may be used in different embodiments independently of other features of the embodiments shown herein. Therefore, the scope of the invention and the claims thereto are not limited to the specific embodiments and / or combinations of features shown herein, but rather may include any combination of one, two or more features shown herein.

Claims

1. A multi-display support pumping assembly, A first pump comprising a first fluid displacer configured to reciprocate along a first pump shaft within a first displacer cavity for pumping fluid through a first pumping chamber, A second pump comprising a second fluid displacer configured to reciprocate along a second pump shaft within a second displacer cavity for pumping fluid through a second pumping chamber, Equipped with, A multi-displacer pumping assembly wherein the first pumping chamber is fluidly connected to the second displacer cavity to receive fluid from the second displacer cavity and to output fluid to the second displacer cavity.

2. The multi-displacer pumping assembly according to claim 1, wherein the second fluid displacer is configured to fluidly connect the first pumping chamber alternately to the inlet passage so that the first pumping chamber receives the fluid from the inlet passage, and to the outlet passage so that the first pumping chamber outputs the fluid to the outlet passage.

3. The multidisplacer pumping assembly according to claim 2, wherein the second pumping chamber is alternately fluidly connected to the inlet passage to receive the fluid from the inlet passage and to the fluid passage to output the fluid to the outlet passage.

4. The second displacer cavity includes the second pumping chamber, a first flow chamber fluidly connected to the inflow passage, a second flow chamber fluidly connected to the outflow passage, and a common chamber. The first pumping chamber is fluidly connected to the common chamber. The second fluid displacer fluidly connects the first flow chamber and the common chamber in order to connect the first pumping chamber to the inflow passage. The second fluid displacer fluidly connects the second flow chamber and the common chamber in order to connect the first pumping chamber to the outflow passage. The multi-display pumping assembly according to claim 1.

5. The multi-display pumping assembly according to claim 4, wherein the common chamber is located in the axial direction between the first flow chamber and the second flow chamber.

6. The multi-displacer pumping assembly according to claim 4 or 5, wherein the second fluid displacer is configured to fluidly isolate the first flow chamber from the common chamber before fluidly connecting the second flow chamber to the common chamber.

7. The multi-displacer pumping assembly according to claim 4 or 5, wherein the second fluid displacer is configured to fluidly isolate the second flow chamber from the common chamber before fluidly connecting the first flow chamber to the common chamber.

8. The multidisplacer pumping assembly according to claim 4 or 5, wherein a common passage extends between the first pumping chamber and the common chamber to fluidly connect the first pumping chamber and the common chamber.

9. The multi-display pumping assembly according to claim 8, wherein the common passage comprises a first branching path and a second branching path.

10. A first check valve is arranged in the first branch path, A second check valve is located in the second branch path, The multi-display pumping assembly according to claim 9, further comprising:

11. The multi-displacer pumping assembly according to any one of claims 1 to 5, wherein the second fluid displacer is elongated along the second reciprocating axis.

12. The multi-displacer pumping assembly according to claim 1, wherein the second fluid displacer includes a chamber connector formed on or within the second fluid displacer, the chamber connector being configured to alternately connect the first pumping chamber to an inlet path and an outlet path.

13. The multi-displacer pumping assembly according to claim 12, wherein the chamber connector is formed as an undercut on the outside of the second fluid displacer.

14. The multi-displacer pumping assembly according to claim 13, wherein the undercut extends completely circumferentially around the second fluid displacer.

15. The second pump described above is A first routing seal that defines at least partially the first fluid chamber within the second displacement cavity, A second routing seal that defines at least partially a second fluid chamber within the second displacement cavity, Furthermore, The second fluid displacer engages with the first routing seal and, apart from the second routing seal, fluidly connects the second routing chamber and the first pumping chamber. The second fluid displacer seals with the second routing seal and fluidly connects the first routing chamber and the first pumping chamber, away from the first routing seal. A multi-display pumping assembly according to any one of claims 12 to 14.

16. The multi-displacer pumping assembly according to claim 15, wherein a common chamber is formed between the first routing seal and the second routing seal, and the common chamber is fluidly connected to the first pumping chamber, with the second fluid displacer engaged with the first routing seal and the second fluid displacer engaged with the second routing seal.

17. The third pump further comprises a third fluid displacer configured to reciprocate along a third pump shaft within a third displacer cavity for pumping fluid through a third pumping chamber. The second pumping chamber is fluidly connected to the third displacement cavity in order to receive fluid from the third displacement cavity and output fluid to the third displacement cavity. A multi-display pumping assembly according to any one of claims 1 to 5.

18. The fourth pump further comprises a fourth fluid displacer configured to reciprocate along a fourth pump shaft within a fourth displacer cavity for pumping fluid through a fourth pumping chamber. The third pumping chamber is fluidly connected to the fourth displacement cavity in order to receive fluid from the fourth displacement cavity and output fluid to the fourth displacement cavity. The multi-display pumping assembly according to claim 17.

19. The multi-displacer pumping assembly according to claim 18, wherein the fourth pumping chamber is fluidly connected to the first displacer cavity to receive fluid from the first displacer cavity and to output fluid to the first displacer cavity.

20. The multi-displacer pumping assembly according to any one of claims 1 to 5, wherein the first displacer cavity is formed within the first pump body, the second displacer cavity is formed within the second pump body, and the first pump body is fixed to the second pump body.

21. A multi-display support pumping assembly, A first pump comprising a first fluid displacer configured to reciprocate along a first pump shaft within a first displacer cavity for pumping fluid through a first pumping chamber, A second pump comprising a second fluid displacer configured to reciprocate along a second pump shaft within a second displacer cavity for pumping fluid through a second pumping chamber, The first fluid chamber formed within the second displacement cavity, A second fluid chamber formed within the second displacement cavity, A common chamber formed within the second displacement cavity, A common passage extending between the first pumping chamber and the common chamber, which fluidly connects them, An inlet passage fluidically connected to the first fluid chamber to supply the fluid to the first fluid chamber, An outflow passage fluidically connected to the second fluid chamber to receive fluid from the second fluid chamber, Equipped with, A multi-displacer pumping assembly wherein the second fluid displacer is configured to fluidly connect the first pump alternately to the first fluid chamber to receive the fluid flowing into the first pumping chamber and to the second fluid chamber to output the fluid.

22. The second pump described above is A first routing seal is disposed between the first fluid chamber and the common chamber, A second routing seal is disposed between the second fluid chamber and the common chamber, Furthermore, The second fluid displacer seals and engages with the first routing seal to fluidly separate the first pumping chamber from the first fluid chamber. The second fluid displacer engages with the second routing seal to fluidly separate the first pumping chamber from the second fluid chamber. The multi-display pumping assembly according to claim 21.

23. The multi-displacer pumping assembly according to claim 22, wherein the second fluid displacer is separated from the first routing seal to fluidly connect the first fluid chamber and the common chamber.

24. The multi-displacer pumping assembly according to any one of claims 21 to 23, wherein the second pump further comprises a first pump seal that at least partially defines the second pumping chamber, and the second fluid displacer seal-engages with the first pump seal throughout the pump cycle of the second fluid displacer.

25. The multidisplacer pumping assembly according to claim 24, wherein the first pump seal defines at least partially the second pumping chamber and one of the first fluid chamber and the second fluid chamber.

26. The multi-displacer pumping assembly according to any one of claims 21 to 23, wherein the second fluid displacer includes a chamber connector formed on the outside of the second fluid displacer.

27. The multi-display pumping assembly according to any one of claims 21 to 23, wherein the common passage includes a plurality of branching paths.

28. A first check valve is located in the first branch path among the plurality of branch paths, and the first check valve is configured to allow flow to the first pumping chamber through the common passage. A second check valve is located within the second branch path among the plurality of branch paths, and the second check valve is configured to allow flow from the first pumping chamber through the common passage. The multi-display pumping assembly according to claim 27.

29. The multi-displacer pumping assembly according to any one of claims 21 to 23, further comprising a drive device connected to the first fluid displacer and the second fluid displacer, configured to cause the first fluid displacer to reciprocate linearly on the first pump shaft and the second fluid displacer to reciprocate linearly on the second pump shaft.

30. The multi-display pumping assembly according to claim 29, wherein the drive device is an oscillating drive device.

31. A pumping method, The steps include: reciprocating a first fluid displacer on a first pump shaft to pump fluid from an inflow passage to an outflow passage through a first pumping chamber; The steps include: reciprocating a second fluid displacer on a second pump shaft to pump fluid from the inflow passage to the outflow passage through a second pumping chamber; During the filling stroke of the first fluid displacer, the second fluid displacer fluidly connects the first pumping chamber to the inflow passage; During the discharge stroke of the first fluid displacer, the second fluid displacer fluidly connects the first pumping chamber to the outflow passage; A method that includes this.

32. During the filling stroke of the first fluid displacer, the step of fluidly connecting the first pumping chamber to the inflow passage by the second fluid displacer is: A step of moving the second fluid displacer away from the first routing seal in order to fluidly connect the first flow chamber to the common chamber, wherein the first flow chamber is fluidly connected to the inflow passage and the common chamber is fluidly connected to the first pumping chamber, The steps include engaging a second routing seal with a second fluid displacer in order to fluidly disconnect a second flow chamber from the common chamber, wherein the second flow chamber is fluidly connected to the outflow passage, The method according to claim 31, including

33. The method according to claim 32, wherein the second fluid displacer engages with the second routing seal before disengaging from the first routing seal.

34. During the discharge stroke of the first fluid displacer, the step of fluidly connecting the first pumping chamber to the outflow passage by the second fluid displacer is: The steps include moving the second fluid displacer so that it moves away from the second routing seal in order to fluidly connect the second flow chamber to the common chamber, To fluidly separate the first flow chamber from the common chamber, the first routing seal is engaged with the second fluid displacer, The method according to claim 32 or 33, including the method described in claim 32 or 33.

35. The method according to claim 34, wherein the second fluid displacer engages with the first routing seal before disengaging from the second routing seal.

36. A multi-display support pumping assembly, A first reciprocating body configured to reciprocate along a first axis within a first displacement cavity for pumping fluid through a first pumping chamber, A second reciprocating body is configured to reciprocate along a second axis within a second displacer cavity in order to alternately fluidize the first pumping chamber to the inflow passage so that the first pumping chamber receives the fluid from the inflow passage, and to alternately fluidize the first pumping chamber to the outflow passage so that the first pumping chamber outputs the fluid to the outflow passage. A multi-display support pumping assembly equipped with a multi-display support.

37. The multi-display pumping assembly according to claim 36, wherein the first axis is parallel to the second axis and offset from the second axis.

38. The multidisplacer pumping assembly according to claim 36 or 37, wherein the second reciprocating body is further configured to pump fluid through a second pumping chamber.

39. The multidisplacer pumping assembly according to claim 36 or 37, wherein the first reciprocating body is configured to alternately fluidly connect the third pumping chamber to the inlet passage so that the third pumping chamber receives the fluid from the inlet passage, and to the outlet passage so that the third pumping chamber outputs the fluid to the outlet passage, and the third reciprocating body is configured to reciprocate along the third axis to pump the fluid through the third pumping chamber.

40. The multi-display pumping assembly according to claim 39, wherein the third axis is parallel to the first axis and offset from the first axis.

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