Plunger-sliding shoe assembly multipurpose leakage verification device and use method thereof

Abstract

The invention belongs to the technical field of axial plunger pump testing, and discloses a plunger-sliding shoe assembly multipurpose leakage verification device and a using method thereof.The device comprises a shell, a plunger sleeve, an adjusting pad, a spring and a backing ring; the plunger sleeve, the adjusting pad, the spring and the backing ring are arranged in the shell and jointly form a plunger-sliding shoe assembly fixing structure of the plunger pump. A tested piece serving as a plunger-sliding shoe assembly is installed in a fixing structure in the shell. Wherein the shell is provided with an oil inlet A at the front end of the plunger part of the tested piece, the shell is provided with an oil inlet B at the rear end of the sliding shoe part of the tested piece, and the shell is provided with an oil outlet C at the side surface of the sliding shoe part of the tested piece. By detecting the pressure and flow change of the oil inlet A, the oil inlet B and the oil outlet C, the plunger-sliding shoe related leakage rule can be analyzed, and the static pressure support and the pre-tightening force of the sliding shoe can be verified.

Description

Technical Field

[0001] The invention belongs to the technical field of axial piston pump testing, and relates to a device for testing the leakage of a piston pump, and in particular to a multi-purpose leakage verification device for a plunger-slipper assembly and a use method thereof. Background Art

[0002] According to the working characteristics of the axial piston pump, the leakages involving the plunger-slipper assembly mainly include piston pair leakage, ball joint pair leakage, and slipper pair leakage. The slipper pair involves the static pressure support design of the slipper, which is difficult to calculate and simulate theoretically, has complex working conditions, and is difficult to design and verify. The commonly used leakage test is a comprehensive evaluation of the sum of the leakages of the three. The evaluation method is not scientific enough, and the single leakage of the plunger pair, ball joint pair, and slipper pair cannot be effectively measured, which makes design improvement and forward design more difficult. Summary of the invention

[0003] In order to solve the above problems, the present invention provides a multi-purpose leakage verification device for a plunger-slipper assembly and a method for using the same. The device and method can measure the leakage of the plunger pair, ball joint pair, and slipper pair of the plunger-slipper assembly, and can verify the static pressure support and preload of the slipper. The above test can be performed on plunger-slipper assemblies of different specifications by replacing the plunger sleeve and the spring seat.

[0004] The technical solution of the present invention is as follows:

[0005] A multi-purpose leakage verification device for a plunger-slipper assembly comprises a housing, a plunger sleeve, an adjustment pad, a spring and a gasket; the plunger sleeve, the adjustment pad, the spring and the gasket are arranged in the housing, and together constitute a plunger-slipper assembly fixing structure of a plunger pump; a test piece as the plunger-slipper assembly is installed in the fixing structure in the housing; wherein the housing is provided with an oil inlet A at the front end of the plunger part of the test piece, the housing is provided with an oil inlet B at the rear end of the slipper part of the test piece, and the housing is provided with an oil outlet C at the side of the slipper part of the test piece.

[0006] Furthermore, the plunger sleeve simulates the sleeve of the blocking pump, a sealing structure is provided between the plunger sleeve and the housing, an adjustment pad and a gasket are provided on the rear end outer ring of the plunger sleeve, a spring is provided on the rear end inner ring of the plunger sleeve, and the other ends of the gasket and the spring are both the inner wall of the housing.

[0007] Furthermore, the housing is divided into an upper housing and a lower housing, the plunger sleeve, adjustment pad, spring, gasket, and oil inlet A are arranged in the upper housing, and the oil inlet B is arranged in the lower housing. The inner wall of the housing at the other end of the gasket is the front end of the lower housing, and the front end center of the lower housing is also provided with a surface quality simulation inclined plate surface that matches the rear end of the sliding shoe part of the test piece, and the oil inlet B is connected to the test piece from the center of the surface quality simulation inclined plate surface.

[0008] A method for using a multi-purpose leakage verification device for a plunger-slipper assembly, using the aforementioned multi-purpose leakage verification device for a plunger-slipper assembly, comprising:

[0009] Block the internal oil channel of the plunger in the test piece, close the oil inlet B, and perform a plunger pair leakage test: adjust the number and thickness of the adjustment pads to change the fitting length of the plunger pair, introduce high-pressure oil at the oil inlet A, measure the flow rate of the oil outlet C, and obtain the variation pattern of the plunger pair leakage with the plunger pair fitting length.

[0010] A method for using a multi-purpose leakage verification device for a plunger-slipper assembly, using the aforementioned multi-purpose leakage verification device for a plunger-slipper assembly, comprising:

[0011] Block the sliding shoe oil channel in the test piece, close the oil inlet B, and perform a ball joint leakage test: introduce high-pressure oil into the oil inlet A, measure the flow rate of the oil outlet C, and the total leakage of the plunger pair and the ball joint pair can be obtained. The leakage of the ball joint pair can be obtained by subtracting the leakage of the plunger pair from the total leakage.

[0012] A method for using a multi-purpose leakage verification device for a plunger-slipper assembly, using the aforementioned multi-purpose leakage verification device for a plunger-slipper assembly, comprising:

[0013] The oil inlet B is closed and a leakage test of the slipper pair is carried out: by changing the number and thickness of the adjusting pads and the amount of spring compression, the slipper part of the test piece is subjected to different amounts of preload. High-pressure oil is introduced into the oil inlet A, and the flow rate of the oil outlet C is measured to obtain the total leakage of the plunger pair, ball joint pair and slipper pair. By subtracting the leakage of the plunger pair and the ball joint pair from the total leakage, the variation pattern of the slipper pair leakage as the slipper part is subjected to different amounts of preload is obtained.

[0014] A method for using a multi-purpose leakage verification device for a plunger-slipper assembly, using the aforementioned multi-purpose leakage verification device for a plunger-slipper assembly, comprising:

[0015] Block the internal oil channel of the plunger in the test piece and conduct a static pressure support force test on the bottom surface of the slipper; introduce high-pressure oil into the oil inlet A to keep the pressure unchanged, and introduce high-pressure oil into the oil inlet B to adjust the inlet pressure of the oil inlet B and detect the flow rate at the oil outlet C. When the flow rate suddenly changes, the static pressure support force of the slipper reaches the maximum, and the slipper is not in contact with the lower shell plane. Calculate the size of the static pressure support force of the bottom surface of the slipper based on the pressure of the oil inlet B and the parameters of the bottom surface of the slipper.

[0016] Furthermore, different types of test pieces are tested by replacing plunger sleeves and spring seats with different inner diameters.

[0017] The beneficial effects of the present invention are as follows:

[0018] 1. The present invention can analyze the law of plunger-slipper related leakage by detecting the pressure and flow changes of the three oil ports, namely, the oil inlet A, the oil inlet B, and the oil outlet C, and can also verify the static pressure support and preload force of the slipper.

[0019] 2. The present invention can effectively measure the single leakage of the plunger pair, ball joint pair and slide shoe pair of the plunger-slide shoe. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for describing the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 The present invention is a schematic diagram of a multi-purpose leakage verification device of a plunger-slipper and an implementation method of the testing method.

[0022] Among them, 1 is the upper shell, 2 is the lower shell, 3 is the plunger sleeve, 4 is the adjustment pad, 5 is the spring, 6 is the gasket, 7 is the spring seat, and 8 is the test piece. DETAILED DESCRIPTION

[0023] This section is an embodiment of the present invention, which is used to explain and illustrate the technical solution of the present invention. In the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0024] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate directions or positional relationships based on the orientations or positional relationships in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or case referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are used only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implying the number of technical features indicated. Thus, features defined as "first", "second", etc. may explicitly or implicitly include more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0025] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be interpreted in a broad sense, for example, it can be a fixed connection, a detachable connection or an integrated connection; it can be a mechanical connection or a point connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0026] Embodiment 1:

[0027] A multi-purpose leakage verification device for a plunger-slipper assembly, comprising a housing, a plunger sleeve 3, an adjustment pad 4, a spring 5 and a gasket 6; the plunger sleeve 3, the adjustment pad 4, the spring 5 and the gasket 6 are arranged in the housing, and together constitute a plunger-slipper assembly fixing structure of a plunger pump; a test piece 8 as a plunger-slipper assembly is installed in the fixing structure in the housing; wherein, the housing is provided with an oil inlet A at the front end of the plunger part of the test piece 8, the housing is provided with an oil inlet B at the rear end of the slipper part of the test piece 8, and the housing is provided with an oil outlet C at the side of the slipper part of the test piece 8.

[0028] The plunger sleeve 3 simulates the sleeve of the blocking pump, and a sealing structure is provided between the plunger sleeve 3 and the housing. An adjustment pad 4 and a gasket ring 6 are provided on the rear end outer ring of the plunger sleeve 3, and a spring 5 is provided on the rear end inner ring of the plunger sleeve 3. The other ends of the gasket ring 6 and the spring 5 are both the inner wall of the housing.

[0029] The shell is divided into an upper shell 1 and a lower shell 2. The plunger sleeve 3, adjustment pad 4, spring 5, gasket 6 and oil inlet A are arranged in the upper shell 1, and the oil inlet B is arranged in the lower shell 2. The inner wall of the shell at the other end of the gasket 6 is the front end of the lower shell 2. The front end center of the lower shell 2 is also provided with a surface quality simulation inclined plate surface that matches the rear end of the sliding shoe part of the test piece 8. The oil inlet B is connected to the test piece 8 from the center of the surface quality simulation inclined plate surface.

[0030] A method for using a multi-purpose leakage verification device for a plunger-slipper assembly, using the aforementioned multi-purpose leakage verification device for a plunger-slipper assembly, comprising:

[0031] Block the internal oil channel of the plunger in the test piece 8, close the oil inlet B, and perform a plunger pair leakage test: adjust the number and thickness of the adjustment pads 4 to change the fitting length of the plunger pair, introduce high-pressure oil at the oil inlet A, measure the flow rate of the oil outlet C, and obtain the variation pattern of the plunger pair leakage with the plunger pair fitting length.

[0032] A method for using a multi-purpose leakage verification device for a plunger-slipper assembly, using the aforementioned multi-purpose leakage verification device for a plunger-slipper assembly, comprising:

[0033] Block the sliding shoe oil channel in the test piece 8, close the oil inlet B, and perform a ball joint leakage test: introduce high-pressure oil into the oil inlet A, measure the flow rate of the oil outlet C, and the total leakage of the plunger pair and the ball joint pair can be obtained. The leakage of the ball joint pair is obtained by subtracting the leakage of the plunger pair from the total leakage.

[0034] A method for using a multi-purpose leakage verification device for a plunger-slipper assembly, using the aforementioned multi-purpose leakage verification device for a plunger-slipper assembly, comprising:

[0035] The oil inlet B is closed and a leakage test of the slipper pair is performed: by changing the number and thickness of the adjusting pads 4 and the compression amount of the spring 5, the slipper part of the test piece 8 is subjected to different amounts of preload. High-pressure oil is introduced into the oil inlet A, and the flow rate of the oil outlet C is measured to obtain the total leakage of the plunger pair, ball joint pair and slipper pair. The leakage of the plunger pair and the ball joint pair is subtracted from the total leakage to obtain the variation pattern of the slipper pair leakage as the slipper part is subjected to different amounts of preload.

[0036] A method for using a multi-purpose leakage verification device for a plunger-slipper assembly, using the aforementioned multi-purpose leakage verification device for a plunger-slipper assembly, comprising:

[0037] Block the internal oil channel of the plunger in the test piece 8, and carry out the static pressure supporting force test of the bottom surface of the slipper; introduce high-pressure oil into the oil inlet A to keep the pressure unchanged, and introduce high-pressure oil into the oil inlet B, adjust the inlet pressure of the oil inlet B, and detect the flow rate of the oil outlet C. When the flow rate suddenly changes, the static pressure supporting force of the slipper reaches the maximum, and the slipper is not in contact with the plane of the lower shell body. According to the pressure of the oil inlet B and the bottom surface parameters of the slipper at this time, the static pressure supporting force of the bottom surface of the slipper is calculated.

[0038] Different types of test pieces 8 are tested by replacing the plunger sleeve 3 and the spring seat 7 with different inner diameters.

[0039] Embodiment 2:

[0040] Figure 1 The present invention is a schematic diagram of a multi-purpose leakage verification device of a plunger-slipper and an implementation method of the testing method.

[0041] refer to Figure 1 , upper shell 1, lower shell 2, plunger sleeve 3, adjustment pad 4, spring 5, gasket 6, spring seat 7, test piece 8. The test piece includes: a plunger and a sliding shoe, which are in the form of an assembly.

[0042] The upper shell 1 and the lower shell 2 are connected by screws, and the joint surface is sealed by a sealing ring. The two serve as the overall frame of the device. A pipe joint is installed on the upper shell 1, which serves as the oil inlet A of the device and can provide a certain pressure of hydraulic oil to the plunger-slipper. The lower shell is equipped with two pipe joints, one of which is the oil inlet B of the device and can provide a certain pressure of hydraulic oil to the oil cavity on the bottom surface of the slipper of the test piece, and the other pipe joint is the oil drain port C of the device, from which the oil leakage of the test piece is discharged.

[0043] The inner hole of the upper housing 1 is matched with the outer diameter of the plunger sleeve 3, the outer diameter of the adjustment pad 4, and the outer diameter of the gasket 6 in a clearance manner, and the plunger sleeve 3, the adjustment pad 4, and the gasket 6 can be disassembled. The plunger sleeve 3 and the hole axis of the upper housing 1 are sealed by a sealing ring to prevent leakage.

[0044] The inner hole of the plunger sleeve 3 and the plunger outer diameter of the test piece 8 simulate the internal matching relationship of the plunger pump, and the bottom surface of the sliding shoe of the test piece 8 fits with the plane of the lower shell 2, which simulates the inclined plate surface of the plunger pump. There are two spring seats 7, one of which fits with the plunger hole axis clearance of the test piece 8, and the end face fits with the end face of the plunger sleeve, and the other fits with the sliding shoe outer diameter hole axis clearance of the test piece 8, and the end face fits with the step surface of the sliding shoe. A spring 5 is installed between the two spring seats 7, and the spring 5 can provide pre-compression force for the sliding shoe.

[0045] The backing ring 6 and the adjusting pad 4 provide a support for the plunger sleeve 3 . The matching length between the plunger sleeve 3 and the plunger of the test piece 8 can be changed, or the compression amount of the spring 5 can be adjusted by adjusting the number and thickness of the adjusting pads 4 .

[0046] The device is mainly composed of upper housing 1, lower housing 2, plunger sleeve 3, adjustment pad 4, spring 5, gasket 6, spring seat 7, test piece 8 and other parts, and has three oil ports: oil inlet A, oil inlet B, and oil outlet C. By detecting the pressure and flow changes of the three oil ports, the law of plunger-slipper related leakage can be analyzed.

[0047] By changing the inner diameters of the plunger sleeve 3 and the spring seat 7 and adapting a new plunger shoe assembly, relevant leakage tests can be performed on plunger shoe assemblies of different specifications.

[0048] The upper shell 1 is provided with an oil inlet A, which can provide hydraulic oil of a certain pressure to the plunger shoe, and the internal hole can provide positioning and support for parts such as the plunger sleeve 3 and the adjustment pad 4.

[0049] The surface quality of the contact surface between the lower housing 2 and the sliding shoe on the test piece 8 simulates the design of the swash plate, and an oil inlet hole is provided in the center, and the lower housing 2 corresponds to the sliding shoe oil hole on the test piece 8. The lower housing 2 is provided with an oil inlet B and an oil outlet C. The oil outlet C can discharge the liquid leaked from the plunger-sliding shoe assembly through this port, and the pressure of the hydraulic chamber at the bottom of the sliding shoe can be adjusted through the oil inlet B.

[0050] By blocking the internal oil channel of the plunger in the test piece 8 and closing the oil inlet B, a plunger pair leakage test can be performed. By adjusting the number and thickness of the adjustment pads 4, the fitting length of the plunger pair can be changed. High-pressure oil is introduced into the oil inlet A, and the flow rate of the oil outlet C is measured. The variation pattern of the plunger pair leakage with the plunger pair fitting length can be obtained.

[0051] The sliding shoe oil channel in the test piece 8 is not processed, the oil inlet B is closed, high-pressure oil is introduced into the oil inlet A, and the flow of the oil outlet C is measured. The total leakage of the plunger pair and the ball joint pair can be obtained. Combined with the test results of the secondary invention point 4, the leakage of the ball joint pair can be indirectly obtained.

[0052] By changing the number and thickness of the adjusting pads 4 and the compression amount of the spring 5, the sliding shoe in the test piece 8 is subjected to different sizes of preload forces. High-pressure oil is introduced into the oil inlet A, the oil inlet B is closed, and the flow rate of the oil outlet C is measured. By referring to the leakage laws of the plunger pair and the ball joint pair in the secondary invention points 4 and 5, the leakage change law of the sliding shoe pair under different preload forces can be indirectly obtained.

[0053] Block the internal oil channel of the plunger in the test piece 8, introduce high-pressure oil of a certain pressure into the oil inlet A to keep the pressure unchanged, introduce high-pressure oil into the oil inlet B, adjust the inlet pressure of the oil inlet B, detect the flow rate of the oil outlet C. When the flow rate changes suddenly, the static pressure supporting force of the slipper reaches the maximum, and the slipper is not in contact with the plane of the lower shell body. According to the pressure of the oil inlet B and the parameters of the bottom surface of the slipper, the static pressure supporting force of the bottom surface of the slipper can be calculated.

[0054] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the field can easily think of various equivalent modifications or substitutions within the technical scope disclosed by the present invention, and these modifications or substitutions should all be covered within the protection scope of the present invention.

Claims

1. A multi-purpose leakage verification device for a plunger-shoe assembly, characterized in that: The invention comprises a housing, a plunger sleeve (3), an adjusting pad (4), a spring (5) and a gasket (6); the plunger sleeve (3), the adjusting pad (4), the spring (5) and the gasket (6) are arranged in the housing, and together constitute a plunger-slipper assembly fixing structure of a plunger pump; a test piece (8) as a plunger-slipper assembly is installed in the fixing structure in the housing; wherein the housing is provided with an oil inlet A at the front end of the plunger part of the test piece (8), the housing is provided with an oil inlet B at the rear end of the slipper part of the test piece (8), and the housing is provided with an oil outlet C at the side of the slipper part of the test piece (8).

2. A multi-purpose leakage verification device for a plunger-shoe assembly according to claim 1, characterized in that: The plunger sleeve (3) simulates the sleeve of the blocking pump, a sealing structure is provided between the plunger sleeve (3) and the housing, an adjustment pad (4) and a gasket ring (6) are provided on the rear end outer ring of the plunger sleeve (3), a spring (5) is provided on the rear end inner ring of the plunger sleeve (3), and the other ends of the gasket ring (6) and the spring (5) are both the inner wall of the housing.

3. A multi-purpose leakage verification device for a plunger-shoe assembly according to claim 1, characterized in that: The housing is divided into an upper housing (1) and a lower housing (2); a plunger sleeve (3), an adjustment pad (4), a spring (5), a gasket (6), and an oil inlet A are arranged in the upper housing (1); an oil inlet B is arranged in the lower housing (2); the housing inner wall at the other end of the gasket (6) is the front end of the lower housing (2); a surface quality simulating inclined disk surface matching the rear end of the sliding shoe part of the test piece (8) is also arranged at the front center of the lower housing (2); and the oil inlet B is connected to the test piece (8) from the center of the surface quality simulating inclined disk surface.

4. A method for using a multi-purpose leakage verification device for a plunger-slipper assembly, using the multi-purpose leakage verification device for a plunger-slipper assembly as claimed in claim 1, characterized in that: include: The internal oil passage of the plunger in the test piece (8) is blocked, the oil inlet B is closed, and a plunger pair leakage test is performed: the number and thickness of the adjustment pads (4) are adjusted to change the fitting length of the plunger pair, high-pressure oil is introduced into the oil inlet A, the flow rate of the oil outlet C is measured, and the variation pattern of the plunger pair leakage with the plunger pair fitting length is obtained.

5. A method for using a multi-purpose leakage verification device for a plunger-shoe assembly, using the multi-purpose leakage verification device for a plunger-shoe assembly as claimed in claim 1, characterized in that: include: Block the oil channel of the sliding shoe in the test piece (8), close the oil inlet B, and conduct a leakage test on the ball joint: introduce high-pressure oil into the oil inlet A, measure the flow rate of the oil outlet C, and the total leakage of the plunger pair and the ball joint pair can be obtained. The leakage of the ball joint pair can be obtained by subtracting the leakage of the plunger pair from the total leakage.

6. A method for using a multi-purpose leakage verification device for a plunger-shoe assembly, using the multi-purpose leakage verification device for a plunger-shoe assembly as claimed in claim 1, characterized in that: include: The oil inlet B is closed and a slipper pair leakage test is performed: by changing the number and thickness of the adjustment pads (4) and the compression amount of the spring (5), the slipper part of the test piece (8) is subjected to different magnitudes of preload. High-pressure oil is introduced into the oil inlet A and the flow rate of the oil outlet C is measured to obtain the total leakage of the plunger pair, the ball joint pair and the slipper pair. By subtracting the leakage of the plunger pair and the ball joint pair from the total leakage, the variation pattern of the slipper pair leakage as the slipper part is subjected to different magnitudes of preload is obtained.

7. A method for using a multi-purpose leakage verification device for a plunger-shoe assembly, using the multi-purpose leakage verification device for a plunger-shoe assembly as claimed in claim 1, characterized in that: include: The internal oil passage of the plunger in the test piece (8) is blocked to perform a static pressure support force test on the bottom surface of the sliding shoe; High-pressure oil is introduced into the oil inlet A to keep the pressure constant, and high-pressure oil is introduced into the oil inlet B to adjust the inlet pressure of the oil inlet B. The flow rate of the oil outlet C is detected. When the flow rate changes suddenly, the static pressure support force of the slipper reaches the maximum, and the slipper is not in contact with the plane of the lower shell body. The static pressure support force of the bottom surface of the slipper is calculated based on the pressure of the oil inlet B and the bottom surface parameters of the slipper.

8. A method for using a multi-purpose leakage verification device for a plunger-shoe assembly according to any one of claims 4 to 7, characterized in that: By replacing the plunger sleeve (3) and the spring seat (7) with different inner diameters, different types of test pieces (8) can be tested.

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