displacement pump

Abstract

A displacement pump includes a pump body and a piston at least partially disposed in the pump body, the piston configured to reciprocate on an axis to pump a fluid. At least one seal groove is formed on an exterior of the pump body. The at least one seal groove is configured to receive a seal, the seal forming a seal between the pump body and a suction tube, the suction tube providing fluid to a pump inlet of the pump. The seal forms a seal between the exterior of the pump body and an interior of the suction tube.

Description

[0001] Cross-references to related applications

[0002] This application claims priority to U.S. Provisional Application No. 63 / 610,262 entitled “Displacement Pump”, filed on December 14, 2023, the entire contents of which are incorporated herein by reference. Background Technology

[0003] This invention generally relates to fluid pumping systems and components thereof. More specifically, this invention relates to displacement pumps in fluid pumping systems.

[0004] Fluid sprayers include a pump that pressurizes the spray fluid and delivers it to a nozzle, where it is ultimately ejected as an atomized spray. Fluid sprayers also include a spray gun that can be held and operated by the user. The spray gun typically receives pressurized paint or other coatings and atomizes the spray fluid. In some applications, the spray fluid is pressurized by a piston or diaphragm; this type of spraying is called airless spraying.

[0005] Airless spraying pressures typically range from approximately 500 psi (about 3.45 MPa) to approximately 7000 psi (about 48.26 MPa), but can also be lower or higher. Uneven spray patterns can occur due to the movement of the piston or diaphragm, especially during spraying stops and starts, or due to periodic reversals of the piston or diaphragm's direction. For example, internal chambers within the flow channel may contain pockets of the spray fluid, through which pressure waves can be reflected or echoed, resulting in uneven spray patterns. Summary of the Invention

[0006] According to one aspect of the invention, a displacement pump includes: a pump body; a piston at least partially disposed in the pump body, the piston being configured to reciprocate along a pump axis to pump fluid through the pump body; a first check valve disposed in the pump body, the first check valve being configured to regulate fluid flow into an upstream fluid chamber within the pump body through a pump inlet; a second check valve carried by the piston, the second check valve being configured to regulate fluid flow from the upstream fluid chamber into a downstream fluid chamber within the pump body; and at least one sealing groove formed on the exterior of the pump body.

[0007] According to an additional or alternative aspect of the invention, a displacement pump includes: a pump body; a piston at least partially disposed in the pump body, the piston being configured to reciprocate along a pump axis to pump fluid through the pump body; a first check valve disposed in the pump body, the first check valve being configured to regulate fluid flow into an upstream fluid chamber of the pump body through a pump inlet; a second check valve carried by the piston, the second check valve being configured to regulate fluid flow from the upstream fluid chamber to a downstream fluid chamber within the pump body; and an external thread formed on the pump body, the external thread radially overlapping the upstream fluid chamber.

[0008] According to another additional or alternative aspect of the invention, a displacement pump includes: a pump body; a piston at least partially disposed in the pump body, the piston being configured to reciprocate along a pump axis to pump fluid through the pump body; a first check valve disposed in the pump body, the first check valve being configured to regulate fluid flow into an upstream fluid chamber within the pump body through a pump inlet; a second check valve carried by the piston, the second check valve being configured to regulate fluid flow into a downstream fluid chamber within the pump body from the upstream fluid chamber; and an external thread formed on the pump body, the external thread radially overlapping the first check valve.

[0009] According to another additional or alternative aspect of this disclosure, a displacement pump includes: a pump body; a piston at least partially disposed within the pump body, the piston configured to reciprocate along a pump axis to pump fluid through the pump body; a first check valve disposed within the pump body, the first check valve configured to regulate fluid flow into an upstream fluid chamber within the pump body through a pump inlet; a second check valve carried by the piston, the second check valve configured to regulate fluid flow into a downstream fluid chamber within the pump body from the upstream fluid chamber; at least one sealing groove extending to the exterior of the pump body; and an external thread formed on the pump body. The at least one sealing groove is axially disposed between the external thread and the pump inlet.

[0010] According to another additional or alternative aspect of this disclosure, a displacement pump includes: a pump body; a piston at least partially disposed in the pump body, the piston being configured to reciprocate along a pump axis to pump fluid through the pump body; and at least one sealing groove formed on the exterior of the pump body.

[0011] According to another additional or alternative aspect of this disclosure, a displacement pump includes: a pump body including an inlet housing and an outlet housing, the outlet housing being a cylinder, at least a portion of the outlet housing being located within the inlet housing, the inlet housing being connected to the outlet housing via a threaded interface; a piston at least partially disposed within the outlet housing, the piston being configured to reciprocate along a pump axis to pump fluid through the pump body; a first check valve disposed inside the inlet housing and outside the outlet housing, the first check valve being configured to regulate fluid flow into an upstream fluid chamber within the outlet housing via the pump inlet; a second check valve carried by the piston, the second check valve being configured to regulate fluid flow from the upstream fluid chamber to a downstream fluid chamber within the pump body; and at least one sealing groove formed on the outside of the inlet housing such that the at least one sealing groove directly radially overlaps with the first check valve. Attached Figure Description

[0012] Figure 1 A simplified block diagram of the pumping system.

[0013] Figure 2 An isometric view of the pumping assembly.

[0014] Figure 3AThis is a cross-sectional view of the displacement pump and suction assembly, showing the suction assembly separated from the displacement pump.

[0015] Figure 3B This is a cross-sectional view of the displacement pump and suction assembly connected together.

[0016] Figure 4 It is an enlarged isometric view showing the displacement pump and suction assembly connected together. Detailed Implementation

[0017] This invention relates to displacement pumps for pumping systems. The pump disclosed according to the invention can be used in spraying systems, for example, to spray paint, varnish, water, oil, colorant, coating, aggregate, coating, and solvent onto a substrate. The pump disclosed according to the invention is configured to cooperate with a suction pipe via a portion of the pump's receiver within the suction pipe. The pump includes one or more seals disposed outside the pump body. The sealing interface between the pump and the suction pipe is formed by one or more seals located outside the pump and inside the suction pipe. The pump disclosed according to the invention is more compact and lighter than conventional pumps. The pump disclosed according to the invention extends the service life of the seals at the interface between the pump and the suction pipe. The pump disclosed according to the invention facilitates the maintenance of the check valve within the pump, allowing for simpler and more efficient removal of debris and manual removal of stuck check valve balls without disassembling the pump.

[0018] Components are considered radially overlapping when they are located at a common position along the same axis, and a straight line extending radially from the axis passes through each radially overlapping component. Components are considered axially overlapping when they are located at the same radial and circumferential position relative to the axis, and an axis parallel to the axis passes through all axially overlapping components. Components are considered circumferentially overlapping when they are aligned around the axis, at the same radial distance from the axis, and a circle centered on the axis passes through all circumferentially overlapping components.

[0019] Figure 1 This is a simplified block diagram of a fluid pumping system 10. The fluid pumping system 10 includes a pumping assembly 12, a reservoir 14, a supply line 16, and a spray gun 18. The pumping assembly 12 includes an assembly body 20, a support 22, a pump 24, a motor 26, a driver 28, and a controller 30. The support 22 includes a support member 32. The pump 24 includes a pump body 34 and a piston 36. The controller 30 includes control circuitry 38, a memory 40, and a user interface 42. The spray gun 18 includes a handle 44, a trigger 46, and a nozzle 48.

[0020] The fluid pumping system 10 is configured to deliver pressurized fluid to a location downstream of the pump. In the illustrated example, the fluid pumping system 10 can also be considered as constituting a fluid spraying system, since the downstream location is a spray gun 18 configured to output the pumped fluid as a spray onto the target substrate. However, it should be understood that not all examples are so limited, and the fluid pumping system 10 can also be used to pump fluid to locations other than the spray gun 18.

[0021] The pumping assembly 12 draws fluid (e.g., paint, varnish, water, oil, colorant, coating, aggregate, coating, and solvent) from the reservoir 14 and delivers it under pressure to the spray gun 18 for spraying. The fluid pumping system 10 can be an airless spraying system because it does not rely on compressed air to form or atomize the fluid spray. Instead, the pump 24 generates sufficient pressure for the nozzle 48 to atomize the fluid into a spray.

[0022] The support bracket 22 supports other components of the pumping assembly 12 relative to a support surface (e.g., a floor or ground). The support bracket 22 consists of one or more support members 32 that extend vertically relative to the assembly body 20 and contact the support surface. The support members 32 may be legs, rails, etc. The support members 32 shown in the figure extend from the assembly body 20 near both the front end (the side containing the pump 24) and the rear end (opposite to the front end) of the assembly body 20. However, it should be understood that in some examples of the support bracket 22, the support members 32 extend only from the rear end of the assembly body 20. For example, the support member 32 may include a portion extending vertically from the assembly body 20 and a horizontal portion contacting the support surface. In some examples, the support bracket 22 may include one or more wheels in contact with the ground to facilitate movement of the pumping assembly 12, such as moving it around the work site.

[0023] The assembly body 20 is vertically supported above the support surface by a bracket 22. The assembly body 20 supports and receives one or more components of the pumping assembly 12. The pump 24 is supported by the assembly body 20. The pump 24 is detachably connected to the assembly body 20, allowing it to be removed for maintenance, storage, replacement, and other operations. The pump body 34 is connected to the assembly body 20 via clamps, supports (e.g., rings or flanges), threaded interfaces, etc. The piston 36 is at least partially located within the pump body 34 and configured along its axis ( Figure 1 The axis PA in the middle reciprocates to pump fluid from reservoir 14 to a downstream location. It is understood that pump 24 can be any form suitable for pressurizing and pumping fluid to spray gun 18 for spraying. In some examples, pump 24 is a dual displacement pump, which outputs fluid during both the upward or suction stroke of piston 36 and the downward or pressure stroke of piston 36.

[0024] Motor 26 is operatively connected to pump 24, driving pump 24 to pump. Motor 26 is at least partially housed within component body 20. Motor 26 may be completely housed within component body 20. In the example shown, motor 26 is an electric motor. For example, motor 26 may be a DC brushed motor or a brushless motor, or an AC induction motor, etc. Motor 26 is operatively connected to piston 36, driving piston 36 to reciprocate along pump axis PA, thereby driving pump 24 to pump. Pump axis PA may be a vertical axis, etc.

[0025] In the example shown, motor 26 and driver 28 cause piston 36 to reciprocate. Motor 26 is connected to driver 28 and configured to provide a rotary output to driver 28. Driver 28 is at least partially disposed within component body 20 and configured to convert the rotary output of motor 26 into a linear reciprocating input of piston 36. Driver 28 can be any form suitable for converting a rotary output into a linear reciprocating input, such as a cam, connecting rod, eccentric crank, ball screw, etc.

[0026] Controller 30 is operatively connected to motor 26 to control the operation of motor 26, thereby controlling the pumping of pump 24. Controller 30 may include one or more processors for performing the functions described herein. Controller 30 may be at least partially housed within component body 20 or may be separate from component body 20. Controller 30 is operatively connected to other components of fluid pumping system 10 to control the operation of other components of fluid pumping system 10. Controller 30 is configured to store software, implement functions, and / or process instructions. Controller 30 is configured to perform any of the functions described herein, including receiving outputs from any sensors mentioned herein, detecting any conditions or events mentioned herein, and controlling the operation of any components mentioned herein. Controller 30 may be in any suitable configuration for controlling the operation of components of fluid pumping system 10 (e.g., motor 26), receiving signals from components of fluid pumping system 10 (e.g., pressure transducers, flow sensors, etc.), acquiring data, processing data, etc. Controller 30 may include hardware, firmware, and / or stored software, and controller 30 may be wholly or partially mounted on one or more circuit boards. Controller 30 can be any type suitable for operation according to the technology described herein.

[0027] In one example, control circuitry 38 is configured to perform a specific function and / or process instructions. For example, control circuitry 38 may process instructions stored in memory 40. Examples of control circuitry 38 may include one or more of a processor, microprocessor, controller, digital signal processor (DSP), application-specific integrated circuit (ASIC), field-programmable gate array (FPGA), or other equivalent discrete or integrated logic circuitry. Control circuitry 38 may be mounted, in whole or in part, on one or more circuit boards.

[0028] Memory 40 can be configured to store information before, during, and / or after operation. In some examples, memory 40 is described as a computer-readable storage medium. In some examples, the computer-readable storage medium may include a non-transient medium. The term "non-transient" can mean that the storage medium is not contained in a carrier wave or propagating signal. In some examples, a non-transient storage medium may store data that changes over time (e.g., in RAM or a cache). In some examples, memory 40 is temporary memory, meaning that the primary purpose of memory 40 is not long-term storage. In some examples, memory 40 is described as volatile memory, meaning that memory 40 does not retain its stored contents when controller 30 is powered off. Examples of volatile memory include random access memory (RAM), dynamic random access memory (DRAM), static random access memory (SRAM), and other forms of volatile memory. In some examples, memory 40 is used to store program instructions executed by control circuitry 38. In one example, memory 40 is used by software or an application to temporarily store information during program execution. Memory 40 can be configured to store a larger amount of information than volatile memory. Memory 40 can also be configured to store information long-term. In some examples, memory 40 includes non-volatile storage elements. Examples of such non-volatile storage elements include magnetic hard disks, optical disks, flash memory, or electrically programmable read-only memory (EPROM) or electrically erasable programmable read-only memory (EEPROM).

[0029] User interface 42 is configured to receive input from a user to provide to controller 30, and / or to provide output to the user. User interface 42 can be any graphical and / or mechanical interface that enables the user to interact with controller 30. For example, user interface 42 can be implemented as a graphical user interface, displayed on a display device for presenting information to the user and / or receiving input from the user. User interface 42 may include graphical navigation and control elements, such as graphical buttons or other graphical control elements displayed on the display device. In some examples, user interface 42 includes physical navigation and control elements, such as physically driven buttons or other physical navigation and control elements. For example, user interface 42 may be or include knobs, sliders, one or more buttons, etc. Typically, user interface 42 may include any input and / or output devices and control elements that enable the user to interact with controller 30. In some examples, user interface 42 is configured to receive output settings from the user. Output settings are used to set target output parameters for the fluid output of the fluid pumping component, such as target pressure or target flow rate. User interface 42 may be located outside of component body 20 or form part of its exterior.

[0030] Transducer 50 is configured to provide information about one or more parameters of the fluid output from pumping assembly 12. For example, transducer 50 may be configured as a pressure sensor to provide pressure information to controller 30; transducer 50 may be configured as a flow sensor to provide flow information to controller 30; transducer 50 may also include pressure and flow sensing elements to provide both pressure and flow information to controller 30 simultaneously, and so on. Transducer 50 may also be simply referred to as a sensor.

[0031] Motor sensor 51 is configured to provide controller 30 with information about one or more operating parameters of motor 26. For example, motor sensor 51 may be a speed sensor configured to generate information about the rotor speed of motor 26. For example, motor sensor 51 may be one or more Hall effect sensors, encoders, etc.

[0032] The spray gun 18 is configured to spray liquid in the form of atomized liquid through nozzle 48. A trigger 46 is operatively connected to a valve (not shown) within the spray gun 18 to open and close the flow path of nozzle 48. The user can hold the handle 44 with one hand and adjust the direction of the spray gun 18 for aiming. The user can control the spraying action of the spray gun 18 by pressing the trigger 46 with the hand holding the handle 44.

[0033] During operation, the controller 30 provides commands to the motor 26 to cause it to run. For example, the controller 30 can command the motor 26 to run based on an input signal from the transducer 50 (indicating the need for pumping), thereby causing the pump 24 to draw fluid from the reservoir 14 and deliver it through the supply line 16. For example, the transducer 50 can provide pressure information indicating a drop in fluid pressure, which indicates that the spray gun 18 is being driven to spray fluid.

[0034] Motor 26 generates a rotary output, which is supplied to driver 28. Driver 28 is driven by motor 26 and outputs linear reciprocating motion to piston 36. Piston 36 reciprocates about pump shaft PA, drawing fluid from reservoir 14 and delivering the fluid downstream through supply line 16. To achieve spraying, the user actuates trigger 46 to open the valve in spray gun 18, and fluid is sprayed out through nozzle 48 in the form of atomized liquid spray.

[0035] Figure 2 This is an isometric view of the pumping assembly 12. The assembly body 20, bracket 22, pump 24, suction assembly 52, control assembly 54, and power supply 56 are shown. The assembly body 20 includes a pump bracket 58, a housing 60, and a handle 62. The bracket 22 includes a support member 32. The pump body 34 and pump mounting 64 of the pump 24 are also shown. The suction assembly 52 includes a pump connector 66, an inlet pipe 68, and a hose 70.

[0036] Pumping assembly 12 is configured to pump from a reservoir (e.g., reservoir 14) Figure 1 The fluid is drawn in and delivered under pressure to a downstream location (e.g., spray gun 18). Figure 1 The main body 20 surrounds and supports various other components of the pumping assembly 12. The housing 60 forms at least a portion of the exterior of the pumping assembly 12. The motor 26 and the driver 28 are each at least partially disposed within the housing 60.

[0037] An assembly handle 62 extends from the top of the housing 60. In some examples, the assembly handle 62 may be attached to the housing 60. In some examples, the assembly handle 62 may be attached to a frame at least partially located within the housing 60. The assembly handle 62 provides a position for the user to interact with the pumping assembly 12, allowing the pumping assembly 12 to be moved between different locations, such as around the work site. The user can hold the assembly handle 62 to pick up and move the pumping assembly 12.

[0038] Pump bracket 58 is configured to connect to pump 24 to support pump 24 on assembly body 20. For example, pump bracket 58 may be formed wholly or partially of a frame of assembly body 20, the frame being at least partially disposed within housing 60. In the illustrated example, a portion of assembly body 20 extends into a gap formed by pump mount 64 of pump 24 to support pump 24. The portion of assembly body 20 extending into the gap can be considered to form pump bracket 58. In some examples, pump bracket 58 may be considered to form or include flanges extending into the gap to support pump 24.

[0039] Pump mount 64 can be configured to connect to pump bracket 58 to mount pump 24 onto assembly body 20. For example, pump mount 64 can consist of a pair of rings with a gap between them, the gap being configured to receive a portion of pump bracket 58 to mount pump 24 onto assembly body 20.

[0040] Pump 24 is mounted on component body 20 and driver 28. The piston 36 of pump 24 is connected to driver 28 and reciprocates via driver 28. Pump body 34 of pump 24 is connected to and supported by component body 20. The installation of pump 24 can be considered as installation via a static interface and a dynamic interface; the static interface is the interface between pump mounting part 64 and component body 20, and the dynamic interface is the interface between piston 36 and driver 28.

[0041] The control assembly 54 is supported by the assembly body 20. The control assembly 54 is located outside the housing 60. The control assembly 54 is fluidly connected to the pump 24 to receive the output fluid from the pump 24. The control assembly 54 may receive components such as filters. Filters can remove contaminants from the fluid before it is pumped to a downstream location. An output hose (not shown) extends between the outlet of the pump 24 and the inlet of the control assembly 54. The control assembly 54 is used to control the output fluid of the pumping assembly 12. For example, during the priming of the pump 24, the control assembly 54 can be placed in a priming state, in which case the fluid supplied to the control assembly 56 is output back to the reservoir 14. The control assembly 54 can also be in an output state, in which case the fluid is output through the output fitting 72 to a supply line (e.g., supply line 16) to be delivered to a downstream location, such as for spraying.

[0042] The suction assembly 52 is fluidly connected to the pump 24. The other end of the suction assembly 52, opposite the end connected to the pump 24, is configured to extend into the reservoir 14, such that fluid in the reservoir 14 is drawn into the suction assembly 52 and supplied to the pump 24. A pump connector 66 connects to the pump body 34, thereby connecting the suction assembly 52 to the pump 24. For example, the pump connector 66 may be a threaded connector for threading the suction assembly 52 to the pump body 34. An inlet pipe 68 is located between the pump 24 and a hose 70. The hose 70 extends from the inlet pipe 68 for supplying fluid to the inlet pipe 68. The hose 70 may be formed as a flexible tube. The inlet pipe 68 may be rigid. It should be understood that in some examples, the suction assembly 52 may extend vertically downwards from the pump 24 into the reservoir 14, which is positioned directly below the pump 24. In such examples, the suction assembly 52 may include a rigid body and does not necessarily include the inlet pipe 68 and the hose 70.

[0043] The bracket 22 supports other components of the pumping assembly 12. The support member 32 extends vertically downward from the bottom end of the pump 24 and contacts the support surface. In the illustrated example, the support member 32 consists of multiple legs. In the illustrated example, the bracket 22 includes four legs, but it is understood that the number of legs may vary.

[0044] Power source 56 is used to provide power to the electrical components of pumping assembly 12, such as motor 26 and controller 30. In the illustrated example, power source 56 is a power cord that can be plugged into a wall socket. However, it should be understood that in various other examples, power source 56 may consist of one or more batteries. For example, these batteries may be removable and rechargeable.

[0045] Figure 3A This is an isometric view of pump 24. Figure 3B This is a cross-sectional view of pump 24, showing pump 24 connected to suction assembly 52. Figure 3CThe cross-sectional view of pump 24 also shows a portion of the suction assembly 52, which is separate from pump 24. Figures 3A to 3C They will be discussed together. Pump 24 includes pump body 34, piston 36, pump mount 64, check valve 74a, check valve 74b, throat seal 76, and piston seal 78. Pump body 34 includes inlet housing 80, outlet housing 82, and pump cap 84. Pump inlet 86 is formed in inlet housing 80, and pump outlet 88 is formed in outlet housing 82. It should be noted that outlet housing 82 can also be referred to as cylinder. Pump body 34 also includes sealing groove 90, connector sealing groove 92, external thread 94, and internal thread 96. Pump body 34 also includes upper thread 98 and lower thread 100. Piston 36 includes piston rod 102, retainer 104, piston cap 106, piston inlet 108, and piston outlet 110. Piston cap 106 includes neck 112 and head 114. Pump mount 64 includes upper ring 116 and lower ring 118. Check valve 74a includes a cage 120, a ball 122a, and a seat 124a. Check valve 74b includes a ball 122b and a seat 124b. The pump connector 66, inlet pipe 68, and hose 70 of the suction assembly 52 are also shown in the figure. Pump connector 66 includes connector thread 126.

[0046] Pump 24 is configured to draw in fluid through pump inlet 86 and discharge pressurized fluid through pump outlet 88. In the example shown, pump 24 is a dual displacement pump, such that pump 24 is configured to discharge fluid during the upstroke (e.g., along axial AD1) and downstroke (e.g., along axial AD2) of piston 36.

[0047] The inlet housing 80 and the outlet housing 82 are connected, forming the main body of the pump body 34. The inlet housing 80 and the outlet housing 82 constitute the fluid handling portion of the pump body 34. In the illustrated example, the inlet housing 80 is connected to the outlet housing 82 via the engagement of its internal thread with the lower thread 100 of the outlet housing 82. In the illustrated example, at least a portion of the outlet housing 82 extends into the inlet housing 80, thereby connecting the outlet housing 82 to the inlet housing 80. Therefore, the inlet housing 80 and the outlet housing 82 are connected via a threaded interface. The lower thread 100 is formed on the exterior of the outlet housing 82, and thus can be considered as forming an external thread on the outlet housing 82. In the illustrated example, the outlet housing 82 extends into the inlet housing 80, and the outlet housing 82 and the inlet housing 80 are connected together.

[0048] Pump chamber 128 is disposed within pump body 34. Piston 36 divides pump chamber 128 into upstream chamber 130 and downstream chamber 132. During operation, during the upstroke of pump 24, fluid is first drawn into upstream chamber 130 through pump inlet 86. Simultaneously, fluid in downstream chamber 132 is discharged from pump 24 through pump outlet 88. Piston 36 reverses direction and moves during the downstroke, during which fluid in upstream chamber 130 is driven through flow channels in piston 36 into downstream chamber 132, and during this time, fluid in downstream chamber 132 is also discharged through pump outlet 88.

[0049] Pump cap 84 is connected to outlet housing 82. For example, pump cap 84 can be connected to outlet housing 82 via a threaded interface formed between the two. Pump cap 84 is used to secure throat seal 76 within pump body 34.

[0050] Piston 36 is at least partially disposed within pump body 34. In the illustrated example, a portion of piston 36 extends outside pump body 34 such that at least a portion of piston 36 does not radially overlap with pump body 34. Piston 36 is at least partially disposed within outlet housing 82. Piston rod 102 is at least partially disposed within pump body 34 and extends outside pump body 34 in the illustrated example. Piston cap 106 is formed at a first end of piston rod 102. Piston cap 106 is used to engage with actuator 28 to receive reciprocating driving force from actuator 28. In the illustrated example, piston cap 106 includes a neck 112 extending from piston rod 102 and a head 114 located on the opposite side of neck 112 to piston rod 102. Shoulder 134 extends between outer surface of piston rod 102 and neck 112. In the illustrated example, neck 112 is narrower than head 114 and piston rod 102, while head 114 is wider than neck 112. For example, the diameter of the neck 112 may be smaller than the diameter of the head 114, and the diameter of the neck 112 may also be smaller than the diameter of the piston rod 102, for example, at the shoulder 134. The piston cap 106 may extend into the connecting slot of the drive link of the actuator 28, as discussed in U.S. Patent No. 10,077,771 (assigned to Graco Minnesota Inc.), the entire contents of which are incorporated herein by reference.

[0051] In the example shown, the piston cap 106 is integrally formed with the piston rod 102, but this is not the case in all examples. For example, the piston cap 106 may be separately formed and connected to the piston rod 102, for instance, by inserting a rod extending from one of the piston cap 106 and the piston rod 102 into a slot formed on the other of the piston cap 106 and the piston rod 102. This connection between the rod and the slot can be achieved via a threaded interface.

[0052] A retainer 104 is mounted on the piston rod 102. The retainer 104 extends through a second end of the piston rod 102, opposite the first end, from which the piston cap 106 extends. The retainer 104 is connected to the piston rod 102, for example, through a threaded engagement between the outer surface of the retainer 104 and the inner surface of the piston rod 102. The retainer 104 secures the piston seal 78 to the piston 36.

[0053] A piston inlet 108 is formed through a retainer 104. The piston 36 is configured to draw in pumping fluid through the piston inlet 108. The piston inlet 108 may be coaxially arranged with the piston rod 102 on the pump axis PA. A piston outlet 110 is formed through the piston 36 and provides fluid communication between the internal flow channels of the piston 36 and the downstream chamber 132. The piston outlet 110 may extend radially. In the illustrated example, the piston outlet 110 is formed through the wall of the piston rod 102, thereby providing fluid communication between the internal flow channels of the piston 36 and the downstream chamber 132.

[0054] A throat seal 76 is disposed within the pump body 34. The throat seal 76 is positioned between and engages with the piston 36 and the pump body 34, thereby forming a sealing interface. In the illustrated example, the throat seal 76 engages with the piston rod 102 and the outlet housing 82. The throat seal 76 is secured between the shoulder of the outlet housing 82 and the pump cap 84. The throat seal 76 may be composed of multiple layers of sealing rings (also referred to as packing rings). In the illustrated example, the throat seal 76 forms a static sealing interface with the pump body 34 and a dynamic sealing interface with the piston 36.

[0055] A piston seal 78 is disposed within the pump body 34. The piston seal 78 is positioned between and engages with the piston 36 and the pump body 34, thereby forming a sealing interface. In the illustrated example, the piston seal 78 engages with the piston rod 102 and the outlet housing 82. The piston seal 78 is secured between a shoulder on the piston rod 102 and a protrusion on the retainer 104. The piston seal 78 may be formed by stacking multiple sealing rings (also referred to as packing rings). In the illustrated example, the piston seal 78 forms a static sealing interface with the piston 36 and a dynamic sealing interface with the pump body 34.

[0056] A check valve 74a is disposed within the pump body 34. The check valve 74a is configured to regulate the flow rate from the suction hose 70 to the fluid chamber 128. Specifically, the check valve 74a is configured to regulate the flow rate from the suction hose 70 to the upstream fluid chamber 128. In the illustrated example, the check valve 74a is disposed inside the inlet housing 80 and outside the outlet housing 82. A cage 120 is disposed within the pump body 34. In the illustrated example, the cage 120 is fixed between the outlet housing 82 and the inlet housing 80. The cage 120 restricts the displacement of the ball 122a in the downstream direction AD1. The ball 122a is disposed within the pump body 34. In this example, the ball 122a is disposed within the inlet housing 80. The ball 122a is at least partially located within the cage 120. A valve seat 124a is located within the pump body 34. In the illustrated example, the valve seat 124a is located within the inlet housing 80. When the check valve 74a is closed, the ball 122a engages with the valve seat 124a; when the check valve 74a is open, the ball 122a disengages from the valve seat 124a.

[0057] A check valve 74b is disposed within the pump body 34. The check valve 74b is located within and slides with the piston 36. The check valve 74b is configured to regulate the flow rate from the upstream fluid chamber 130 to the downstream fluid chamber 132. A portion of the piston rod 102 restricts the displacement of the ball 122b in the downstream direction AD1. The ball 122b is disposed within the pump body 34. The ball 122b is located at least within the piston 36. A valve seat 124b is disposed within the pump body 34. The valve seat 124b is located within the piston 36. The valve seat 124b may be formed or supported by a retainer 104. When the check valve 74b is closed, the ball 122b engages with the valve seat 124b; when the check valve 74b is open, the ball 122b disengages from the valve seat 124b.

[0058] A pump mount 64 is disposed on a pump body 34. In some embodiments, the pump mount 64 may be integrally formed with the pump body 34. For example, the upper ring 116 and / or the lower ring 118 may be integrally formed with other parts of the pump body 34 (e.g., with the outlet housing 82). A gap is formed between the upper ring 116 and the lower ring 118 for receiving a portion of the component body 20 (e.g., the pump bracket 58) for mounting the pump 24 onto the component body 20. In the illustrated embodiment, the lower ring 118 is threadedly connected to the pump body 34 at an upper thread 98. In the illustrated embodiment, the upper ring 116 is threadedly connected to the pump body 34 at an upper thread 98. In some embodiments, the pump mount 64 may be formed as a clamp for clamping the component body 20. For example, the lower ring 118 may be rotatable about the pump body 34 to move its lower portion. The lower ring 118 may be moved axially. Moving the lower ring 118 may adjust the size of the gap, thereby clamping and releasing the pump 24 from the component body 20.

[0059] A sealing groove 90 is formed on the exterior of the pump body 34. In the illustrated example, multiple sealing grooves 90a and 90b are formed on the exterior of the pump body 34. However, it is understood that the pump 24 may include a single sealing groove 90 or more than two sealing grooves 90 on the exterior of the pump body 34. A seal 136 is disposed within the sealing groove 90. The seal 136 may be an elastomeric seal, such as an O-ring seal. In the illustrated example, seal 136a is disposed within sealing groove 90a, and seal 136b is disposed within sealing groove 90b. Sealing groove 90a is axially disposed between the pump inlet 86 and sealing groove 90b. Sealing groove 90b is axially disposed between sealing groove 90a and external thread 94.

[0060] Seal 136 is configured to engage with suction assembly 52, thereby forming a fluid seal between pump body 34 and suction assembly 52. ​​In the illustrated example, seal 136 is configured to engage with the inner surface of inlet pipe 68. In the illustrated example, inlet housing 80 extends into receiver 138 of inlet pipe 68. Seal 136 engages with the outer surface of pump body 34 and the inner surface of inlet pipe 68. The sealing engagement between pump body 34 and suction assembly 52 prevents fluid leakage.

[0061] At least one sealing groove 90 radially overlaps with check valve 74a. The sealing groove 90 may directly overlap radially with check valve 74a. In the illustrated example, at least one sealing groove 90 is coplanar with check valve 74a such that a plane perpendicular to the pump axis PA passes through check valve 74a and at least one sealing groove 90. In the illustrated example, at least one sealing groove 90 radially overlaps with valve seat 124a of check valve 74a. Therefore, in the illustrated example, at least one seal 136 radially overlaps with valve seat 124a. At least one sealing groove 90 is coplanar with the first check valve 74a on a plane perpendicular to axis PA. In some examples, one sealing groove 90 radially overlaps with check valve 74a, while another sealing groove 90 does not radially overlap with check valve 74a. In the illustrated example, the upper sealing groove 90b radially overlaps with check valve 74a, while the lower sealing groove 90a does not radially overlap with check valve 74a. In the example shown, the sealing groove 90 is arranged such that the outlet housing 82 axially overlaps with the sealing groove 90 relative to the pump axis PA. The outlet housing 82 may also axially overlap with the seal 136 relative to the pump axis PA.

[0062] In the illustrated example, the inlet housing 80 includes a threaded portion 172 and a sealing portion 174. One or more sealing grooves 90 are provided on the sealing portion 174. In the illustrated example, the sealing portion 174 is narrower than the threaded portion 172. An annular shoulder 176 is provided between the threaded portion 172 and the sealing portion 174. The annular shoulder 176 may define a diametrical transition between the threaded portion 172 and the sealing portion 174. The annular shoulder 176 may directly radially overlap with the check valve 74a. The annular shoulder 176 may be arranged at a right angle. For example, the annular shoulder 176 may be arranged at a right angle relative to the threaded portion 172 and / or the sealing portion 174.

[0063] Pump connector 66 can engage with threaded portion 172. Pump connector 66 can be connected to inlet housing 80 by engaging with threaded portion 172 via threads. Pump connector 66 can form at least one seal with sealing portion 174.

[0064] Pump inlet 86 is an opening in the housing 80 located on the pump axis PA, through which pumping fluid enters the pump body 34. Inlet passage 140 connects pump inlet 86 and check valve 74a. Inlet passage 140 includes an inclined portion 142 and an axial portion 144. Inclined portion 142 extends between pump inlet 86 and axial portion 144. Inclined portion 142 is inclined inward toward pump axis PA along the flow direction (e.g., along axial AD1). Inclined portion 142 ensures a smooth flow of fluid into axial portion 144 and to check valve 74a without abrupt turns in the passage by guiding fluid radially inward toward pump axis PA. Furthermore, in the event of ball 122a jamming, inclined portion 142 facilitates the user inserting a finger into inlet passage 140 to contact and remove ball 122a.

[0065] The axial portion 144 extends between the inclined portion 142 and the check valve 74a. Fluid entering the pump body 34 flows through the pump inlet 86 and along the inclined portion 142 to the axial portion 144. The fluid flows through the axial portion 144 and then through the check valve 74a into the fluid chamber 128. The external sealing groove 90 and the seal 136 facilitate the guiding of fluid through the inlet passage 140 with the inclined portion 142. When the seal is positioned within the inlet passage upstream of the check valve 74a, a flat, axially extending surface is required for the seal to engage to achieve the desired sealing effect.

[0066] The external sealing groove 90 makes the inlet housing 80 more compact and axially shorter, thereby reducing the material required to form the inlet housing and lowering manufacturing costs. Compared to the case where the seal contacts the inner surface of the inlet housing 80, the external sealing groove 90 allows the pump inlet 86 to be axially closer to the check valve 74a. In the example shown, the axial length AL1 of the inlet passage 140 between the pump inlet 86 and the check valve 74a is less than the axial length AL2 of the check valve 74a. In the example shown, the axial length AL1 of the inlet passage 140 between the pump inlet 86 and the check valve 74a is less than the diameter of the ball 122a.

[0067] The axial length AL3 of the inlet housing 80 is less than the axial length AL4 of the outlet housing 82. The axial length of the portion of the inlet housing 80 that does not contain threads (e.g., external thread 94 or internal thread 96) is less than the axial length of the portion of the inlet housing 80 that contains threads. In some examples, the axial length AL3 of the inlet housing 80 may be less than about 60% of the axial length AL4 of the outlet housing 82. The compact structure of the inlet housing 80 relative to the outlet housing 82 makes the pump body 34 more compact overall, thereby reducing the material required for manufacturing, lowering costs, and allowing the pump 24 to be placed closer to the ground, thus making the pumping assembly 12 more compact in the vertical direction.

[0068] The suction assembly 52 connects to the pump body 34, forming a fluid connection between the reservoir 14 and the pump 24. The pump connector 66 engages with the pump body 34, securing the suction assembly 52 to the pump body 34. When the pump connector 66 is mounted to the pump body 34, it radially surrounds at least one sealing groove 90. In the illustrated example, the connector thread 126 engages with the external thread 94 to connect the suction assembly 52 to the pump body 34. While in the illustrated example the suction assembly 52 is threadedly engaged to the pump body 34, it should be understood that this is not the case in all examples.

[0069] The inlet tube 68 extends between the hose 70 and the pump connector 66. In the illustrated example, even after the suction assembly 52 is removed from the pump 24, the pump connector 66 remains at one end of the inlet tube 68. A retaining clip 160 is mounted on the inlet tube 68. The pump connector 66 slides on the bearing 162. The retaining clip 160 prevents the bearing 162 and the pump connector 66 from moving along the inlet tube 68, thus simplifying installation, as the user does not need to move the pump connector 66 even if it slips down the inlet tube 68. Positioning the pump connector 66 on the inlet tube 68 also prevents the pump connector 66 from accidentally getting stuck on the inlet tube 68, such as getting stuck on an inclined portion outside the inlet tube 68.

[0070] In the illustrated example, inlet pipe 68 includes a hose connector 146, an upstream elbow 148, a horizontal portion 150, a downstream elbow 152, and a vertical portion 154. A receiver 138 is disposed at the distal end of the vertical portion 154. A bracket 158 ​​forms the base of receiver 138 and axially overlaps with inlet housing 80. The hose connector 146 is configured to engage with hose 70 for fluid connection with both hose 70 and inlet pipe 68. In the illustrated example, hose connector 146 extends into and engages with hose 70. Hose connector 146 is angled between pump axis PA and connector axis CA. For example, hose connector 146 may be angled at 45 degrees relative to pump axis PA, but other angles are also possible. Coupler 156 is externally connected to hose 70, thereby connecting hose 70 to inlet pipe 68.

[0071] An upstream elbow 148 connects a hose connector 146 and a horizontal portion 150. The horizontal portion 150 extends between the upstream elbow 148 and the downstream elbow 152. The horizontal portion represents the lowest vertical portion of the fluid flow path within the upstream inlet pipe 68 of the pump 24. In some embodiments, the horizontal portion 150 may constitute the lowest vertical portion of the upstream flow path of the pump 24; it should be understood that the upstream flow path is within the suction assembly 52, and not just the fluid stored in the reservoir 14. In the illustrated embodiment, at least a portion of the horizontal portion 150 is located directly below the pump 24. At least a portion of the horizontal portion 150 axially overlaps with the pump body 24 relative to the pump axis PA. At least a portion of the horizontal portion 150 axially overlaps with the inlet housing 80 relative to the pump axis PA. At least a portion of the horizontal portion 150 axially overlaps with the outlet housing 82 relative to the pump axis PA.

[0072] Downstream elbow 152 redirects the flow path from horizontal flow along connector axis CA within horizontal section 150 to vertical flow along pump axis PA as fluid approaches pump inlet 86. Fluid within vertical section 154 flows along pump axis PA.

[0073] The connecting axis CA, positioned along the horizontal portion 150, is orthogonal to the pump axis PA, which reciprocates the piston 36. The inlet pipe 68 with the horizontal portion 150 facilitates a more compact and lower-profile pumping assembly 12. Previous inlet connectors included a tube, such as a J-shaped tube, bent at its vertical lowest point. The horizontal portion 150 positions the fluid flowing through the inlet pipe 68 at its vertical lowest point and closer to the pump inlet 86, thereby enabling more efficient delivery of fluid from the suction assembly 52 to the pump 24. Compared to a bent J-shaped tube, the horizontal portion 150 also provides greater space for material settling, extending the lifespan of the suction assembly 52 and preventing clogging.

[0074] A receiver 138 is disposed at one end of the inlet pipe 68, opposite the hose connector 146. The receiver 138 is formed by an increased diameter portion of the inlet pipe 68. The receiver 138 is configured such that a portion of the pump body 34 extends into the receiver 138. The receiver 138 radially overlaps with the end of the inlet housing 80 where the pump inlet 86 is formed. A straight line perpendicular to the pump axis PA passes through the inlet housing 80 first and then through the receiver 138. In the illustrated example, the pump body 34 is located within the receiver 138 such that a portion of the receiver 138 radially overlaps with a portion of the check valve 74a. In the illustrated example, a portion of the inlet pipe 68 radially overlaps with the valve seat 124a. In the illustrated example, a portion of the inlet pipe 68 radially overlaps with the ball 122a. In the illustrated example, a portion of the inlet pipe 68 radially overlaps with the cage 120. This radial overlap is possible because the sealing groove 90 and the seal 136 are located outside the pump body 34, thus contributing to a more compact design of the pump 24 and the suction pipe assembly 52.

[0075] The connection interface between the suction assembly 52 and the pump body 34 is at least partially perpendicularly positioned above the check valve 74a. The connection interface between the suction assembly 52 and the pump body 34 is at least partially axially located between check valves 74a and 74b. At least a portion of the connection interface between the suction assembly 52 and the pump body 34 may radially overlap with at least a portion of the check valve 74a. In the illustrated example, at least a portion of the connection interface between the suction assembly 52 and the pump body 34 radially overlaps with the outlet housing 82.

[0076] In the illustrated example, the external thread 94 extends vertically above the check valve 74a. At least a portion of the external thread 94 is axially disposed between the check valves 74a and 74b. In the illustrated example, at least a portion of the external thread 94 radially overlaps with the check valve 74a. In the illustrated example, at least a portion of the external thread 94 radially overlaps with the outlet housing 82. The pump body 34 includes an external thread 94 that directly radially surrounds the first check valve 74a.

[0077] Positioning the external thread 94 radially overlapping with or at least partially perpendicular to the check valve 74a allows for a more compact pump 24 compared to pumps where the suction pipe extends into the pump body 34. In existing pumps where the suction pipe extends into the inlet housing of an existing pump, the thread of pump 24 engaging with the suction assembly 52 cannot be positioned radially overlapping with or perpendicularly above the check valve 74a.

[0078] The connector sealing groove 92 extends to the exterior of the pump body 34. In the illustrated example, the connector sealing groove 92 is formed on the exterior of the housing 80. The connector sealing groove 92 is located on the axial side of the external thread 94 opposite to the sealing groove 90. The connector sealing groove 92 is axially positioned between check valves 74a and 74b. The connector sealing groove 92 is used to receive the connector seal 164. The connector seal 164 can be any seal suitable for forming a seal between the pump body 34 and the pump connector 66. For example, the connector seal 164 can be an elastomeric seal, such as an O-ring. The diameter of the connector sealing groove 92 is larger than the diameter of the sealing groove 90. The connector seal 164 frictionally engages with the pump connector 66 to prevent the pump connector 66 from disengaging during operation.

[0079] The pump body 34 has a width W1 at the external thread 94. The width W1 can be a diameter. The pump body 34 has a width W2 at the sealing groove 90. The width W2 can also be a diameter. The width W1 of the pump body 34 at the external thread is greater than the width W2 of the pump body 34 at the sealing groove 90.

[0080] The formation of a sealing groove 90 on the outside of the pump body 34 provides a compact pump structure. The external sealing groove 90 can be positioned to radially overlap with the check valve 74a, a positioning that would not be possible if the sealing interface between the pump 24 and the suction assembly 52 were located between the inner surface of the pump body 34 and the outer surface of the inlet pipe 68.

[0081] Furthermore, by positioning the sealing groove 90 on the outside of the pump body 34, a seal 136 with a larger outer diameter than the seal that contacts the inner surface of the pump body 34 can be used. The larger outer diameter provides a larger surface area, distributing the load borne by the seal 136 over a larger area, thereby reducing the stress on the seal 136. The less stressed seal 136 provides a longer seal life, reduces the frequency of maintenance or replacement, and lowers material costs.

[0082] Positioning the sealing groove 90 outside the pump body 34 allows the seal 136 to move outside the flow channel within the pump body 34. Furthermore, by coplanarizing or radially overlapping the sealing groove 90 with the check valve 74a, ensuring the seal 136 is not located below the check valve 74a, contamination of the seal 136 is reduced. When the seal 136 is below the check valve 74a, high-speed fluid pulses are pushed back against the check valve 74a, causing fluid accumulation in these sealing areas that engage with the interior of the pump body 34 and are located below the check valve 74a. This accumulation wears down the seal over time. Therefore, positioning the seal 136 so that it is not below the check valve 74a but within the flow channel below the check valve 74a extends the seal's lifespan, reduces maintenance or replacement frequency, and lowers material costs.

[0083] The external placement of the sealing groove 90 on the pump body 34 also provides improved access to the check valve 74a. The external sealing groove 90 allows the seal 136 to be installed higher on the pump body 34, while the seal contacting the inner surface of the pump body 34 is located below the check valve 74a. Conventional pump inlet housings required a greater axial length below the check valve 74a to provide sufficient surface area for the seal's contact with the inner surface of the pump body 34. Placing the sealing groove 90 and seal 136 on the outside of the pump body 34 results in a more compact structure for the access housing 80, especially between the pump inlet 86 and the check valve 74a. The relatively short flow path between the pump inlet 86 and the check valve 74a also facilitates maintenance of the check valve 74a. This structure facilitates cleaning debris from inside the check valve 74a without disassembling the pump 24. Furthermore, the user can easily access the ball 122a; for example, the user can insert a finger through the pump inlet 86 to remove the ball 122a if it becomes stuck. This configuration reduces downtime during maintenance, thereby improving pumping and cleaning efficiency.

[0084] During the installation of the suction assembly 52 onto the pump 24, the receiver 138 is aligned with the inlet housing 80 on the pump axis PA. The suction assembly 52 moves onto the pump body 34, allowing the seal 136 to enter and contact the inner surface of the retainer 104. The seal 136, which contacts the inlet pipe 68, provides a bearing surface for guiding the inlet pipe 68 onto the inlet housing 80. Before the suction assembly 52 is fully installed, the pump connector 66 first engages with the external thread 94. Screwing the pump connector 66 into the external thread pulls the suction assembly 52 onto the pump body 34, thus completing the installation of the suction assembly 52. ​​Therefore, the seal 136 can facilitate guiding the inlet pipe 68 onto the pump body 34, and then the threaded interface between the pump connector 66 and the inlet housing 80 can fully pull the suction assembly 52 onto the pump body 34, providing a simple and convenient alignment and installation.

[0085] In the illustrated example, the pump connector 66 can connect to the lower surface of the housing protrusion 166 of the entry housing 80, where the suction assembly 52 is fully installed. The partial engagement of the pump connector 66 with the entry housing 80 prevents over-tightening of the pump connector 66 and maintains a gap 170 between the bottom surface of the entry housing 80 and the bracket 158. The gap 170 prevents direct metal-to-metal contact, thereby avoiding unnecessary wear.

[0086] Figure 4 The connection between the suction assembly 52 and the pump 24 is shown in an enlarged isometric view. The pump body 34 of the pump 24 is shown. A housing protrusion 166 of the pump body 34 is shown. The housing protrusion 166 is formed on the inlet housing 80. The pump connector 66, inlet pipe 68, and hose 70 of the suction assembly 52 are also shown in the figure. The pump connector 66 includes the connector protrusion 168.

[0087] As described above, the pump connector 66 is connected to the pump body 34 for fluid connection between the suction assembly 52 and the pump 24. A connector protrusion 168 extends radially outward from the body portion of the pump connector 66. The connector protrusion 168 provides a gripping position for the user to interact with the pump connector 66 and apply torque to it, thereby enabling the connection and disconnection of the pump connector 66 from the pump body 34.

[0088] The housing protrusion 166 extends from the exterior of the pump body 34. In the illustrated example, the housing protrusion 166 extends radially outward from the exterior of the inlet housing 80. The housing protrusion 166 provides a gripping point for the user to connect to the pump body 34. For example, the user can apply torque to the housing protrusion 166 when connecting the inlet housing 80 to or disconnecting the inlet housing 80 from the outlet housing 82. The housing protrusion 166 extends axially, providing a larger surface area for the user to apply torque to the inlet housing 80 relative to the outlet housing 82 using a tool (e.g., a hammer). The housing protrusion 166 may occupy 40% or more of the axial length of the inlet housing 80. In some examples, when the suction assembly 52 is mounted to the pump body 34, the housing protrusion 166 may be included along the entire axial length of the inlet housing 80 exposed to the exterior of the pump 24.

[0089] In some examples, the connector protrusion 168 may extend radially outwards further than the housing protrusion 166. Therefore, the distal end of each connector protrusion 168 may be further away from the pump axis PA than the distal end of each housing protrusion 168. This greater radial distance of the connector protrusion 168 from the pump axis PA compared to the housing protrusion 166 allows the user to contact and apply torque to the connector protrusion 168 even if the gap between adjacent connector protrusions 168 is axially overlapped by the housing protrusion 166.

[0090] In the illustrated example, the number of connector protrusions 168 is greater than the number of housing protrusions 166. In some examples, the pump connector 66 includes at least two connector protrusions 168, corresponding to each housing protrusion 166 of the pump body 34. In the illustrated example, the circumferential width of each connector protrusion 168 is smaller than the circumferential width of the housing protrusion 166. The large number of connector protrusions 168 and their smaller circumferential widths ensure that at least one connector protrusion 168 axially overlaps with the gap between adjacent housing protrusions 166 when the pump connector 66 is connected to the pump body 34. This configuration allows the user to contact the connector protrusions 168 through the gap between adjacent housing protrusions 166, thereby simplifying the installation and removal of the pump connector 66 from the pump body 34.

[0091] While the present invention has been described with reference to exemplary embodiments, those skilled in the art will understand that various changes can be made to the exemplary embodiments without departing from the scope of the invention, and equivalents can be substituted for their elements. Furthermore, many modifications can be made to adapt particular situations or materials to the teachings of the invention without departing from the basic scope of the invention. Therefore, the invention is not intended to be limited to the specific embodiments disclosed, but can include all embodiments falling within the scope of the appended claims. Any single feature or any combination of features in the embodiments shown herein may be used independently of other features shown in the embodiments herein in different embodiments. Therefore, the scope of the invention and its claims is not limited to the specific embodiments and / or combinations of features shown herein, but can include any combination of one or more features shown herein.

Claims

1. A displacement pump, comprising: The pump body includes an inlet housing and an outlet housing, the outlet housing being a cylinder, at least a portion of the outlet housing being located within the inlet housing, and the inlet housing being connected to the outlet housing via a threaded interface; A piston, at least partially disposed in the outlet housing, configured to reciprocate along a pump axis to pump fluid through the pump body; A first check valve is disposed inside the inlet housing and outside the outlet housing, and the first check valve is configured to regulate the flow of fluid through the pump inlet and into the upstream fluid chamber within the outlet housing; A second check valve, which is carried by the piston and configured to regulate the fluid flow from the upstream fluid chamber to the downstream fluid chamber within the pump body; At least one sealing groove is formed on the outside of the inlet housing such that the at least one sealing groove directly overlaps radially with the first check valve.

2. The displacement pump as described in claim 1, wherein, The inlet housing includes a threaded portion, a sealing portion, and an annular shoulder, the sealing portion being narrower than the threaded portion, at least one sealing groove being positioned along the sealing portion, and the annular shoulder defining a diameter transition between the threaded portion and the sealing portion.

3. The displacement pump as described in claim 2, wherein, The annular shoulder directly overlaps radially with the first valve.

4. The displacement pump according to any one of claims 2-3, wherein, The ring-shaped shoulder is at a right angle.

5. The displacement pump according to any one of claims 2-4, wherein, The inlet housing keeps the first valve against the outlet housing.

6. The displacement pump according to claims 2-5, further comprising a pump connector, the pump connector being threadedly engaged with the threaded portion and forming at least one seal with the sealing portion.

7. The displacement pump according to any one of claims 1-6, further comprising at least one seal located within each of the at least one sealing groove.

8. The displacement pump according to any one of claims 1-7, further comprising a lower sealing groove formed below the at least one sealing groove on the outside of the inlet housing, the lower sealing groove not directly radially overlapping the first check valve.

9. The displacement pump according to any one of claims 1-8, wherein, The at least one sealing groove directly overlaps radially with the first ball of the first check valve.

10. The displacement pump according to any one of claims 1-9, wherein, The at least one sealing groove includes a first sealing groove and a second sealing groove.

11. The displacement pump according to any one of claims 1-10, wherein, The inlet housing also includes an external thread, which is at least partially axially disposed between the first check valve and the second check valve.

12. The displacement pump as claimed in claim 11, wherein, The at least one sealing groove is disposed axially between the pump inlet and the external thread.

13. The displacement pump as claimed in claim 12, wherein, The diameter of the external thread is greater than the diameter of the at least one sealing groove.

14. The displacement pump according to any one of claims 1-13, wherein, The at least one sealing groove is coplanar with the first check valve on a plane perpendicular to the axis.

15. The displacement pump as claimed in claim 14, wherein, The at least one sealing groove is coplanar with the first valve seat of the first check valve.

16. The displacement pump according to any one of claims 1-15, wherein, The axial length of the inlet housing is less than 60% of the axial length of the outlet housing.

17. The displacement pump according to any one of claims 1-16, wherein, The axial length of the inlet flow channel within the inlet housing and upstream of the first check valve is less than the axial length of the first check valve.

18. The displacement pump according to any one of claims 1-17, wherein, The inlet channel extends between the pump inlet and the first check valve, and wherein the diameter of the at least one sealing groove is greater than the maximum diameter of the inlet channel.

19. The displacement pump according to any one of claims 1-18, wherein, The diameter of at least one sealing groove is greater than the maximum diameter of the upstream fluid chamber.

20. The displacement pump according to any one of claims 1-19, wherein, The diameter of at least one sealing groove is greater than the maximum diameter of the downstream fluid chamber.

21. A displacement pump, comprising: Pump body; A piston, at least partially disposed within the pump body, configured to reciprocate along a pump axis to pump fluid through the pump body; A first check valve is disposed in the pump body and configured to regulate the fluid flow through the pump inlet and into the upstream fluid chamber within the pump body; A second check valve, carried by the piston, is configured to regulate the fluid flow from the upstream fluid chamber to the downstream fluid chamber within the pump body; An external thread is formed on the pump body and radially overlaps with the upstream fluid chamber.

22. The displacement pump as claimed in claim 21, wherein, At least one sealing groove is formed on the outside of the pump body, and the at least one sealing groove is axially disposed between the external thread and the pump inlet.

23. The displacement pump as claimed in claim 22, wherein, The at least one sealing groove includes: First sealing groove; and Second sealing groove.

24. The displacement pump as claimed in claim 23, wherein, The first sealing groove overlaps radially with the first check valve.

25. The displacement pump as claimed in claim 24, wherein, The second sealing groove radially overlaps with the inlet flow channel located between the pump inlet and the first check valve.

26. The displacement pump according to any one of claims 22-25, wherein, The pump body has a first diameter at the external thread, the pump body has a second diameter at at least one sealing groove, and the first diameter is larger than the second diameter.

27. The displacement pump according to any one of claims 21-26, wherein, The pump body includes: The inlet housing formed at the pump inlet; and An outlet housing is connected to the inlet housing, and the piston extends from the pump body through the outlet housing; The external thread is formed on the inlet housing.

28. The displacement pump as claimed in claim 27, wherein, The external thread overlaps radially with the outlet housing.

29. The displacement pump according to any one of claims 27 and 28, wherein, The inlet housing and the outlet housing are connected by threads, and the outlet housing extends into the inlet housing to connect with the inlet housing.

30. The displacement pump of claim 21, further comprising: At least one sealing groove, the at least one sealing groove extending to the outside of the pump body, the at least one sealing groove being axially disposed between the external thread and the pump inlet; A connector sealing groove extends to the outside of the pump body and is disposed on the axial side of the external thread opposite to the at least one sealing groove.

31. A displacement pump, comprising: Pump body; A piston, at least partially disposed within the pump body, configured to reciprocate along a pump axis to pump fluid through the pump body; A first check valve is disposed in the pump body and configured to regulate the fluid flow through the pump inlet and into the upstream fluid chamber within the pump body; A second check valve, which is carried by the piston and configured to regulate the fluid flow from the upstream fluid chamber to the downstream fluid chamber within the pump body; An external thread is formed on the pump body and radially overlaps with the first check valve.

32. A displacement pump, comprising: Pump body; A piston, at least partially disposed in the pump body, configured to reciprocate along a pump axis to pump fluid through the pump body; A first check valve is disposed in the pump body and configured to regulate the fluid flow through the pump inlet and into the upstream fluid chamber within the pump body; A second check valve, which is carried by the piston and configured to regulate the fluid flow from the upstream fluid chamber to the downstream fluid chamber within the pump body; At least one sealing groove, the at least one sealing groove extending to the outside of the pump body; and External thread, the external thread being formed on the pump body; The at least one sealing groove is disposed axially between the external thread and the pump inlet.

33. A displacement pump, comprising: Pump body; A piston, at least partially disposed in the pump body, configured to reciprocate along a pump axis to pump fluid through the pump body; At least one sealing groove is formed on the outside of the pump body.

34. A displacement pump, comprising: Pump body; A piston, at least partially disposed in the pump body, configured to reciprocate along a pump axis to pump fluid through the pump body; A first check valve is disposed in the pump body and configured to regulate the fluid flow into the upstream fluid chamber within the pump body through the pump inlet. A second check valve, which is carried by the piston and configured to regulate the fluid flow from the upstream fluid chamber to the downstream fluid chamber within the pump body; as well as At least one sealing groove is formed on the outside of the pump body.

35. The displacement pump as claimed in claim 34, wherein, The at least one sealing groove overlaps radially with the first check valve.

36. The displacement pump according to any one of claims 34 and 35, wherein, The at least one sealing groove radially overlaps with the first valve seat of the first check valve.

37. The displacement pump according to any one of claims 34-36, wherein, The at least one sealing groove radially overlaps with the first ball of the first check valve.

38. The displacement pump according to any one of claims 34-37, wherein, The at least one sealing groove includes a first sealing groove and a second sealing groove.

39. The displacement pump according to any one of claims 34-38, wherein, The pump body also includes an external thread, which is at least partially axially disposed between the first check valve and the second check valve.

40. The displacement pump as claimed in claim 39, wherein, The at least one sealing groove is disposed axially between the pump inlet and the external thread.

41. The displacement pump as claimed in claim 39, wherein, The external thread is axially disposed between the at least one sealing groove and the pump outlet.

42. The displacement pump according to any one of claims 39-41, wherein, The diameter of the external thread is greater than the diameter of the at least one sealing groove.

43. The displacement pump according to any one of claims 34-42, wherein, The pump body includes: An inlet housing connected to an outlet housing, wherein the pump inlet is formed in the inlet housing; The at least one sealing groove is formed on the inlet housing.

44. The displacement pump as claimed in claim 34, wherein, The pump body includes: An inlet housing through which the pump inlet is formed; An outlet housing is connected to the inlet housing, wherein a pump outlet is formed through the outlet housing; The at least one sealing groove is formed on the inlet housing.

45. The displacement pump as claimed in claim 44, wherein, The inlet housing is connected to the inlet housing via a threaded interface.

46. ​​The displacement pump of any one of claims 44 and 45, further comprising an external thread formed on the inlet housing.

47. The displacement pump as claimed in claim 46, wherein, At least one sealing groove is provided axially between the external thread and the pump inlet.

48. The displacement pump as claimed in claim 46, wherein, The external thread is axially disposed between the at least one sealing groove and the pump outlet.

49. The displacement pump according to any one of claims 46-48, wherein, At least a portion of the external thread radially overlaps with the outlet housing.

50. The displacement pump according to any one of claims 44-49, wherein, The at least one sealing groove is coplanar with the first check valve on a plane perpendicular to the axis.

51. The displacement pump as claimed in claim 50, wherein, The at least one sealing groove is coplanar with the first valve seat of the first check valve.

52. The displacement pump according to any one of claims 44-51, wherein, The axial length of the inlet housing is less than 60% of the axial length of the outlet housing.

53. The displacement pump according to any one of claims 34-52, wherein, The axial length of the inlet flow channel within the pump body and upstream of the first check valve is less than the axial length of the first check valve.

54. The displacement pump according to any one of claims 34-52, wherein, The inlet channel extends between the pump inlet and the first check valve, and wherein the diameter of the at least one sealing groove is greater than the maximum diameter of the inlet channel.

55. The displacement pump according to any one of claims 34-54, wherein, The diameter of at least one sealing groove is greater than the maximum diameter of the upstream fluid chamber.

56. The displacement pump according to any one of claims 34-55, wherein, The diameter of at least one sealing groove is greater than the maximum diameter of the downstream fluid chamber.

57. The displacement pump according to any one of claims 34-56, wherein, The pump body includes external threads that directly radially surround the first check valve.

58. The displacement pump of claim 57, further comprising a pump connector that connects the pump body to the suction pipe, wherein when the pump connector is mounted on the pump body, the pump connector directly radially surrounds the at least one sealing groove.

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