CN217206758U - Single-acting electric pump - Google Patents

Abstract

The application discloses a single-action electric pump, which comprises a shell, a connecting part, a motor, a composite plunger pump, an oil bag and an electromagnetic valve, wherein the motor, the composite plunger pump, the oil bag and the electromagnetic valve are arranged in the shell; wherein the motor includes an output shaft; the composite plunger pump comprises a first plunger pump, a second plunger pump and a change-over valve which are integrally arranged; the first plunger pump comprises a first liquid inlet and a first liquid outlet, and the second plunger pump comprises a second liquid inlet and a second liquid outlet; the composite plunger pump is provided with a liquid outlet flow passage, and the switching valve is arranged on the liquid outlet flow passage; the output shaft is used for driving the first plunger pump and the second plunger pump simultaneously; the number of the oil bags is at least two, and the oil bags are respectively communicated with the first liquid inlet and the second liquid inlet; at least part of the connecting part is positioned outside the shell, the connecting part is provided with a first opening communicated with the liquid outlet flow passage, and the connecting part is used for connecting a tool; the solenoid valve is used for controlling the flow direction of the liquid in the first opening. The application provides a single-action electric pump can save installation space, enlarge the range of application, can also avoid leaking in oil leak and the pressure.

Description

Single-action electric pump

Technical Field

The application relates to the technical field of power pumps, in particular to a single-action electric pump.

Background

The statements in this section merely provide background information related to the present disclosure and may not constitute prior art.

The electric pump, namely the pump that the electric drive is used, can be applied to the broken trade of tearing open of fire control hydraulic pressure. The electric hydraulic pump is mainly applied to emergency rescue, including rescue after fire fighting, rescue after earthquake, rescue of road traffic accidents and other emergency disasters, and provides power support for breaking and dismantling tools.

Existing electrically-powered hydraulic pumps typically include a two-stage pump consisting of a high pressure plunger and a low pressure plunger that simultaneously deliver flow to the equipment at relatively low operating pressures to make the equipment operate more quickly. When the set pressure value is reached, the high-pressure plunger plugs the one-way valve assembly, so that the flow of the low-pressure plunger flows back to the oil tank. However, the power source of the secondary pump structure requires a large installation space, and a plurality of sealing structures are needed when each component is installed, so that the power source loses working capacity if any part fails.

It should be noted that the above background description is only for the convenience of clear and complete description of the technical solutions in the present specification and for the understanding of those skilled in the art. Such solutions are not considered to be known to the person skilled in the art merely because they have been set forth in the background section of the present specification.

SUMMERY OF THE UTILITY MODEL

The technical problem that this application mainly solved provides a single-action electric pump, can save installation space, enlarge the range of application, can also avoid leaking in oil leak and the pressure.

In order to solve the technical problem, the application adopts a technical scheme that: the single-action electric pump comprises a shell, a connecting part, a motor, a composite plunger pump, an oil bag and an electromagnetic valve, wherein the motor, the composite plunger pump, the oil bag and the electromagnetic valve are arranged in the shell;

wherein the motor includes an output shaft; the composite plunger pump comprises a first plunger pump, a second plunger pump and a change-over valve which are integrally arranged; the first plunger pump comprises a first liquid inlet and a first liquid outlet, and the second plunger pump comprises a second liquid inlet and a second liquid outlet; the composite plunger pump is provided with a liquid outlet flow passage, the liquid outlet flow passage is connected with the first liquid outlet and the second liquid outlet, and the conversion valve is arranged on the liquid outlet flow passage; the output shaft is used for driving the first plunger pump and the second plunger pump simultaneously; the number of the oil bags is at least two, and the oil bags are respectively communicated with the first liquid inlet and the second liquid inlet; at least part of the connecting part is positioned outside the shell, the connecting part is provided with a first opening communicated with the liquid outlet flow passage, and the connecting part is used for connecting a tool; the electromagnetic valve is used for controlling the flow direction of the liquid in the first opening.

Further, the single-acting electric pump further comprises a pump body, the composite plunger pump is installed on the pump body, the oil sac is connected with the pump body, and the composite plunger pump and the oil sac are respectively located on two opposite sides of the pump body.

Further, the electromagnetic valve is positioned between the composite plunger pump and the connecting part, and the electromagnetic valve and the composite plunger pump are positioned on the same side of the pump body; the motor is located one side of compound plunger pump deviates from the pump body.

Furthermore, the single-action electric pump also comprises a handle, wherein the handle is electrically connected with the motor and the electromagnetic valve and is used for controlling the starting and stopping of the motor and the working state of the electromagnetic valve; the handle is connected with the shell through a connecting piece.

Further, the single-acting electric pump further comprises a battery located outside the housing, the battery being configured to power the motor and the solenoid valve.

Furthermore, the number of the batteries is at least two, and the batteries are positioned on one side, provided with the oil bag, of the shell along a first direction; the connecting part is positioned on one side of the shell along a second direction; the first direction is perpendicular to the second direction.

Furthermore, the motor is electrically connected with the battery through a first circuit, the electromagnetic valve is electrically connected with the battery through a second circuit, and the single-action electric pump further comprises a power switch which is positioned outside the shell and positioned on the first circuit and the second circuit and used for controlling the on-off of the first circuit and the second circuit.

Further, the single-acting electric pump further comprises an electric quantity display unit, the electric quantity display unit is positioned outside the shell, and the electric quantity display unit is electrically connected with the battery and used for displaying the electric quantity of the battery.

Further, the single-acting electric pump comprises a plurality of the compound plunger pumps which are uniformly distributed along the circumferential direction of the output shaft; the first plunger pump comprises a first rod body, the second plunger pump comprises a second rod body, the first rod body and the second rod body are arranged in parallel, the output shaft is used for driving the first rod body and the second rod body simultaneously, and the first rod body and the output shaft are arranged vertically; the diameter of the second rod body is larger than that of the first rod body, the length of the second rod body is equal to that of the first rod body, and the first rod body and the second rod body are arranged in an aligned mode.

Furthermore, a throat hoop is arranged at an opening of the oil sac and used for connecting the oil sac with the pump body.

Different from the prior art, the beneficial effects of the application are that: according to the single-action electric pump provided by the embodiment of the application, the first plunger pump, the second plunger pump and the change-over valve are integrally arranged, so that the installation space can be saved, and oil leakage and pressure internal leakage can be avoided; through setting up two at least oil sacs, can increase the oil reserve of this electric pump to enlarge the range of application of this electric pump, make electric pump oil volume more sufficient still save manufacturing cost.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the description below are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts. Wherein:

fig. 1 is a schematic structural view of a single-acting electric pump provided in the present embodiment;

FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1;

fig. 3 is a schematic view of another single-acting electric pump according to the present embodiment;

fig. 4 is a schematic structural diagram of a composite plunger pump according to the present embodiment.

Description of the reference numerals:

1. a first plunger pump; 2. a second plunger pump; 3. a liquid outlet flow passage; 31. a first stage; 32. a second section; 4. a first valve body; 5. a second valve body; 6. a first rod body; 7. a second rod body; 8. a return spring; 9. a first mounting case; 10. a second mounting case; 11. a fourth valve body; 12. a fifth valve body; 13. a sixth valve body; 14. a motor; 15. an output shaft; 16. a housing; 17. an oil pocket; 18. a compound plunger pump; 19. a connecting portion; 20. a pump body; 21. a handle; 22. a connecting member; 23. a battery; 24. a power switch; 25. an electric quantity display unit; 26. a hose clamp; 27. an electromagnetic valve; 28. a high-pressure single tube; x, a first direction; y, second direction.

Detailed Description

The technical solutions in the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only some embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the present application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Please refer to fig. 1 to 3. The embodiment of the application provides a single-action electric pump, which comprises a shell 16, a connecting part 19, a motor 14, a composite plunger pump 18, an oil bag 17 and an electromagnetic valve 27, wherein the motor 14, the composite plunger pump 18, the oil bag 17 and the electromagnetic valve 27 are arranged in the shell 16.

Wherein the motor 14 comprises an output shaft 15. The compound plunger pump 18 includes a first plunger pump 1, a second plunger pump 2, and a changeover valve that are integrally provided. The first plunger pump 1 includes a first liquid inlet and a first liquid outlet. The second plunger pump 2 includes a second liquid inlet and a second liquid outlet. The composite plunger pump 18 is provided with a liquid outlet flow passage 3, the liquid outlet flow passage 3 is connected with the first liquid outlet and the second liquid outlet, and the conversion valve is arranged on the liquid outlet flow passage 3. The output shaft 15 is used to drive the first plunger pump 1 and the second plunger pump 2 simultaneously. At least two oil bags 17 are arranged, and the oil bags 17 are respectively communicated with the first liquid inlet and the second liquid inlet. At least part of the connecting part 19 is located outside the housing 16, the connecting part 19 having a first opening communicating with the outlet flow channel 3, the connecting part 19 being for connection of a tool. The solenoid valve 27 is used to control the flow direction of the liquid in the first opening.

According to the single-action electric pump provided by the embodiment of the application, the first plunger pump 1, the second plunger pump 2 and the change-over valve are integrally arranged, so that the installation space can be saved, and oil leakage and pressure internal leakage can be avoided; by arranging at least two oil bags 17, the oil storage capacity of the electric pump can be increased, so that the application range of the electric pump is enlarged, the oil storage capacity of the electric pump is more sufficient, and the production cost is saved.

The connecting portion 19 of the present embodiment is provided with only the first opening, and is used for connecting a single-action tool. In other embodiments, the connection 19 may also be connected to a high-voltage monotube 28. In order to make the single-acting electric pump portable, a piggyback assembly may be provided outside its housing 16. The backpack assembly may be a backpack harness. Specifically, the backpack assembly may be disposed on a surface of the housing 16 that extends along the first direction X and has a larger area.

In this embodiment, the first liquid inlet and the second liquid inlet may correspond to different oil pockets 17. Of course, in other embodiments, the different openings of the oil bag 17 may communicate as an outlet, which communicates with the first and second liquid inlets, respectively.

In this embodiment, the single-acting electric pump further comprises a pump body 20, and the compound plunger pump 18 is mounted on the pump body 20. The oil bag 17 is connected with the pump body 20, and the composite plunger pump 18 and the oil bag 17 are respectively positioned at two opposite sides of the pump body 20. Preferably, a throat hoop 26 is arranged at the opening of the oil pocket 17, and the throat hoop 26 connects the oil pocket 17 with the pump body 20, so that the installation, the disassembly and the maintenance are simpler and more convenient.

Specifically, the solenoid valve 27 is located between the compound plunger pump 18 and the connection portion 19. The solenoid valve 27 and the compound plunger pump 18 are located on the same side of the pump body 20. As shown in fig. 2, the motor 14 is located on a side of the compound plunger pump 18 facing away from the pump body 20.

In this embodiment, the single-acting electric pump further comprises a handle 21, and the handle 21 is electrically connected to the motor 14 and the solenoid valve 27 and is used for controlling the start and stop of the motor 14 and the working state of the solenoid valve 27. The handle 21 is connected to the housing 16 by a connector 22. The connecting member 22 may be a connecting rope, a connecting spring, or the like. The handle 21, the motor 14 and the electromagnetic valve 27 can be connected by wires or wirelessly.

As shown in FIG. 3, the single-acting electric pump may also include a battery 23 for powering the motor 14 and solenoid valve 27. Preferably, the battery 23 is located outside the housing 16, so as to facilitate the disassembly and assembly of the battery 23, and provide great convenience for operation.

Specifically, the number of the batteries 23 is at least two, and the cruising ability of the electric pump can be increased. The battery 23 is located on the side of the housing 16 where the oil pocket 17 is provided, i.e., on the lower side of the housing 16, in the first direction X. Connecting portion 19 is located one side of casing 16 along second direction Y, promptly, sets up connecting portion 19 in the lateral wall of casing 16, is convenient for make connecting portion 19 connect other pipelines and equipment instrument, makes things convenient for taking of this electric pump to move, has reduced the damage risk, when this electric pump is used for connecting the rescue instrument, can provide very big facility for rescue work.

Wherein the first direction X may be perpendicular to the second direction Y. Specifically, in fig. 1, the first direction X is a vertical direction, and the second direction Y is a horizontal direction.

In the present embodiment, the motor 14 and the battery 23 are electrically connected by a first circuit, and the solenoid valve 27 and the battery 23 are electrically connected by a second circuit. The single-acting electric pump may also include a power switch 24. The power switch 24 is located outside the housing 16, and the power switch 24 is located on the first circuit and the second circuit, so as to control the on/off of the first circuit and the second circuit.

Specifically, the single-acting electric pump may further include a power display unit 25. The power display unit 25 is located outside the housing 16, and the power display unit 25 is electrically connected to the battery 23 for displaying the power of the battery 23. As shown in fig. 1, both the power switch 24 and the power display unit 25 can be located above the housing 16 for easy observation and operation by the user. Wherein, switch 24 and handle 21 can play double protection to the start-up of motor 14, solenoid valve 27, and only when switch 24 and handle 21 all are in the open mode, this electric pump can just begin work, has guaranteed the security of operation.

In the present embodiment, the single-acting electric pump may include a plurality of composite plunger pumps 18, and the plurality of composite plunger pumps 18 are uniformly distributed along the circumferential direction of the output shaft 15, thereby further improving the efficiency of the electric pump.

Specifically, the first plunger pump 1 may include a first rod 6, the second plunger pump 2 may include a second rod 7, the first rod 6 and the second rod 7 are arranged in parallel, and the output shaft 15 is configured to drive the first rod 6 and the second rod 7 simultaneously. The first rod 6 and the output shaft 15 are arranged vertically. The diameter of the second body of rod 7 is greater than the diameter of the first body of rod 6, and the length of the second body of rod 7 equals the length of the first body of rod 6, and the first body of rod 6 aligns the setting with the second body of rod 7 to the flow of first plunger pump 1 output is less than the flow of second plunger pump 2 output, then first plunger pump 1 is high pressure plunger pump, and second plunger pump 2 is low pressure plunger pump.

Fig. 4 is a schematic structural view of the compound plunger pump 18. The switching valve may include a first valve body 4 and a second valve body 5, the first valve body 4 is located in the liquid outlet flow passage 3, the second valve body 5 is communicated with the second liquid outlet, and the state of the second valve body 5 is opposite to that of the first valve body 4. The switching valve may further include a third valve body (not shown) in communication with the first liquid outlet.

Specifically, when the pressure of the equipment connected with the connecting part 19 is lower than a first preset value, the second valve body 5 is closed, the first valve body 4 is opened, and the liquid of the second liquid outlet can flow into the equipment; when the pressure of the equipment connected with the connecting part 19 is higher than a first preset value, the second valve body 5 is opened, the first valve body 4 is closed, and the liquid of the second liquid outlet flows out of the second valve body 5 and cannot enter the equipment. When the pressure of the equipment is lower than a second preset value (the second preset value is larger than the first preset value), the third valve body is closed, and the liquid of the first liquid outlet can flow into the equipment; when the pressure of the equipment is higher than a second preset value, the third valve body is opened, and the liquid of the first liquid outlet flows out of the third valve body and cannot enter the equipment.

More specifically, the first liquid inlet (not shown) and the second liquid inlet (not shown) are oriented in the same direction, so that the structure of the electric pump can be optimized and the installation space of the electric pump can be reduced. The first rod body 6 and the second rod body 7 can be provided with a return spring 8 along the axial direction, and the return spring is used for helping the first rod body 6 and the second rod body 7 to return. The first plunger pump 1 includes a first mounting case 9, and the second plunger pump 2 includes a second mounting case 10. First body of rod 6, first inlet and first liquid outlet are located first installation shell 9, and second body of rod 7, second inlet and second liquid outlet are located second installation shell 10. First inlet and first liquid outlet are located the 6 axial one sides of the first body of rod, and second inlet and second liquid outlet are located the 7 axial one sides of the second body of rod, because the first body of rod 6 and the 7 alignment settings of the second body of rod, first inlet, first liquid outlet, second inlet and second liquid outlet are located the first body of rod 6 and the 7 same one side along the axial of the second body of rod respectively.

In the present embodiment, the first and second mounting cases 9 and 10 are arranged in the first direction XX. The compound plunger pump 18 has opposite first and second sides (not shown) in a direction perpendicular to the first direction X and perpendicular to the axial direction of the first rod 6. The second mounting case 10 is provided at first and second sides with first and second outlets (not shown), respectively. The first mounting shell 9 is provided with a third outlet (not shown) at a side facing away from the second mounting shell 10 in the first direction X. The liquid outlet flow passage 3 is communicated with the second liquid outlet through a first outlet, the liquid outlet flow passage 3 is communicated with the second liquid outlet through a third outlet, and the second valve body 5 is communicated with the second liquid outlet through a second outlet. The liquid outlet channel 3 may be substantially L-shaped, that is, the liquid outlet channel 3 at least has a first section 31 extending along the first direction X and a second section 32 extending along the direction from the first side to the second side (perpendicular to the first direction XX), so that the first plunger pump 1 and the second plunger pump 2 can be connected into a whole.

Specifically, a fourth valve body 11 may be disposed between the liquid outlet channel 3 and the connecting portion 19, and the fourth valve body 11 may be located between the first liquid outlet and the first valve body 4. A fifth valve body 12 can be arranged between the first liquid inlet and the oil bag 17, and a sixth valve body 13 can be arranged between the second liquid inlet and the oil bag 17. The fifth valve body 12 and the sixth valve body 13 are oriented parallel to the extending direction of the first rod 6.

In this embodiment, the first valve body 4, the second valve body 5, the third valve body, the fourth valve body 11, the fifth valve body 12, and the sixth valve body 13 are all check valves, the first valve body 4 only allows liquid to flow from the second liquid outlet to the first liquid outlet, the second valve body 5 only allows liquid to flow from the second liquid outlet, the third valve body only allows liquid to flow from the first liquid outlet, the fourth valve body 11 only allows liquid to flow from the liquid outlet channel 3, the fifth valve body 12 only allows liquid to flow into the first liquid inlet, and the sixth valve body 13 only allows liquid to flow into the second liquid inlet. Wherein, the fifth valve body 12 and the sixth valve body 13 can be used as oil suction valve, and the fourth valve body 11 can be used as oil discharge valve. The third valve body may act as a high pressure relief valve.

In a specific application scenario, oil enters the first plunger pump 1 from the fifth valve body 12, is pressed into the fourth valve body 11 by the first rod body 6, enters the device to work, enters the second plunger pump 2 from the sixth valve body 13, is extruded by the second rod body 7, passes through the first valve body 4 of the liquid outlet flow channel 3, is converged with liquid flowing out of the first liquid outlet, enters the fourth valve body 11, and then enters the device to work, and at this time, a pressure value provided by the electric pump is smaller than a first preset value.

When the pressure value required by the equipment is increased to a first preset value (namely the rated pressure of the second valve body 5), the first valve body 4 is closed, so that the liquid flowing out of the second liquid outlet cannot be merged with the liquid flowing out of the first liquid outlet, the second valve body 5 is opened, the liquid flowing out of the second liquid outlet enters a temporary storage oil tank (not shown), and the pressure value provided by the electric pump is larger than the first preset value and smaller than the second preset value.

If the pressure value of the equipment is continuously increased and reaches a second preset value (namely the set value of the third valve body), the third valve body is opened, and redundant pressure flow flows back to the temporary storage oil tank.

It should be noted that, in the description of the present specification, the terms "first", "second", and the like are used for descriptive purposes only and for distinguishing similar objects, and no order is present therebetween, and no indication or suggestion of relative importance is to be made. In addition, in the description of the present specification, the meaning of "a plurality" is two or more unless otherwise specified.

The use of the terms "comprising" or "including" to describe combinations of elements, components, or steps herein also contemplates embodiments that consist essentially of such elements, components, or steps. By using the term "may" herein, it is intended to indicate that any of the described attributes that "may" include are optional.

A plurality of elements, components, parts or steps can be provided by a single integrated element, component, part or step. Alternatively, a single integrated element, component, part or step may be divided into separate plural elements, components, parts or steps. The disclosure of "a" or "an" to describe an element, ingredient, component or step is not intended to foreclose other elements, ingredients, components or steps.

The above description is only an embodiment of the present application, and is not intended to limit the scope of the present application, and all equivalent structures or equivalent processes performed by the present application and the contents of the attached drawings, which are directly or indirectly applied to other related technical fields, are also included in the scope of the present application.

Claims (9)

1. A single-action electric pump is characterized by comprising a shell, a connecting part, a motor, a composite plunger pump, an oil bag and an electromagnetic valve, wherein the motor, the composite plunger pump, the oil bag and the electromagnetic valve are arranged in the shell;

wherein the motor includes an output shaft; the composite plunger pump comprises a first plunger pump, a second plunger pump and a change-over valve which are integrally arranged; the first plunger pump comprises a first liquid inlet and a first liquid outlet, and the second plunger pump comprises a second liquid inlet and a second liquid outlet; the composite plunger pump is provided with a liquid outlet flow passage, the liquid outlet flow passage is connected with the first liquid outlet and the second liquid outlet, and the conversion valve is arranged on the liquid outlet flow passage; the output shaft is used for driving the first plunger pump and the second plunger pump simultaneously; the number of the oil bags is at least two, and the first liquid inlet and the second liquid inlet are correspondingly communicated with different oil bags; at least part of the connecting part is positioned outside the shell, the connecting part is provided with a first opening communicated with the liquid outlet flow passage, and the connecting part is used for connecting a tool; the electromagnetic valve is used for controlling the flow direction of liquid in the first opening;

the single-action electric pump also comprises a pump body, the composite plunger pump is arranged on the pump body, the oil sac is connected with the pump body, and the composite plunger pump and the oil sac are respectively positioned on two opposite sides of the pump body; the electromagnetic valve is positioned between the composite plunger pump and the connecting part, and the electromagnetic valve and the composite plunger pump are positioned on the same side of the pump body; and a back negative assembly is arranged outside the shell.

2. A single-acting electric pump according to claim 1, wherein the motor is located on a side of the compound plunger pump facing away from the pump body.

3. The single-acting electric pump of claim 1, further comprising a handle electrically connected to the motor and the solenoid for controlling the start and stop of the motor and the operating state of the solenoid; the handle is connected with the shell through a connecting piece.

4. A single-acting electric pump according to claim 1, further comprising a battery located outside the housing for powering the motor and the solenoid valve.

5. A single-acting electric pump according to claim 4, wherein there are at least two of said batteries, said batteries being located in a first direction on a side of said housing on which said oil bladder is located; the connecting part is positioned on one side of the shell along a second direction; the first direction is perpendicular to the second direction.

6. The single-acting electric pump of claim 4, wherein the motor and the battery are electrically connected by a first circuit, the solenoid valve and the battery are electrically connected by a second circuit, the single-acting electric pump further comprising a power switch located outside the housing and on the first and second circuits for controlling the switching on and off of the first and second circuits.

7. The single-acting electric pump of claim 4, further comprising a charge display unit located outside the housing, the charge display unit being electrically connected to the battery for displaying the charge of the battery.

8. A single-acting electric pump according to claim 1, comprising a plurality of the compound plunger pumps, the plurality of compound plunger pumps being evenly distributed along the circumferential direction of the output shaft; the first plunger pump comprises a first rod body, the second plunger pump comprises a second rod body, the first rod body and the second rod body are arranged in parallel, the output shaft is used for driving the first rod body and the second rod body simultaneously, and the first rod body and the output shaft are arranged vertically; the diameter of the second rod body is larger than that of the first rod body, the length of the second rod body is equal to that of the first rod body, and the first rod body and the second rod body are arranged in an aligned mode.

9. A single-acting electric pump according to claim 1, wherein a throat band is provided at the opening of the oil bladder for connecting the oil bladder to the pump body.

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