A plunger pair testing device and method suitable for floating cavity plunger pump

Abstract

The present invention discloses a plunger pair testing device and method suitable for a floating cavity type plunger pump, which belongs to the field of plunger pump testing technology. It includes an oil circuit system connected in sequence by components such as an oil tank, a high-pressure pump, and a test fixture. By utilizing the combined arrangement of an actuator, a mobile frame, a fixed frame, a force sensor, and a plunger bracket in the test fixture, and the corresponding arrangement of two cup-shaped containers on the mobile frame, the plunger pair to be tested can be set on the mobile frame with reference to the arrangement in the plunger pump, thereby realizing the testing of the plunger pair under test. The plunger pair testing device and method of the present invention have a simple device structure and a convenient testing process. They can accurately realize the testing of a single plunger pair, obtain the friction force, friction loss, and hydraulic oil leakage between the plunger and the floating cavity, provide an accurate basis for the characterization and optimization design of the performance of the plunger pair, ensure the accuracy and reliability of the design and use of the floating cavity type plunger pump, and have good practical value.

Description

Technical Field

[0001] The invention belongs to the technical field of plunger pump testing, and in particular relates to a plunger pair testing device and method suitable for a floating cavity type plunger pump. Background Art

[0002] In the hydraulic field, plunger pumps are a widely used power component, playing a vital role in a variety of applications. Based on their design principles, plunger pumps can be generally categorized as single plunger pumps, horizontal plunger pumps, axial plunger pumps, and radial plunger pumps. These different types of plunger pumps differ in their operating principles and performance characteristics.

[0003] A new concept in axial piston pumps, following the swash plate and bent axis pumps, the floating cavity piston pump is developed based on the float cup principle. It primarily consists of a plunger, float cup, main shaft, rotor, bearings, retaining plug, port plate, roller plate, support ring, and springs. The float cup is supported by the roller plate and restrained by the retaining plug. The typical structural layout of a floating cavity piston pump utilizes a mirrored design. This unique structure allows the radial and axial forces of the float cup pump to be completely balanced, improving low-speed performance, service life, and reducing pulsation and noise.

[0004] As a key component of an axial piston pump, the plunger pair directly impacts the pump's volumetric efficiency and output performance. Due to the small size and unique operating principle of the floating cavity plunger pump's plunger pair, existing testing equipment struggles to meet these requirements. This makes it difficult to accurately characterize the assembly performance of the plunger pair, particularly its frictional properties. Summary of the Invention

[0005] In response to one or more of the above-mentioned defects or improvement needs of the prior art, the present invention provides a plunger pair testing device and method suitable for a floating cavity plunger pump, which can accurately implement the plunger pair testing of the floating cavity plunger pump, complete the friction performance test and leakage test of the plunger pair, and accurately measure the structural performance of the plunger pair after assembly.

[0006] To achieve the above-mentioned object, one aspect of the present invention provides a plunger pair testing device suitable for a floating cavity type plunger pump, which includes an oil tank, a high-pressure pump and a testing tool;

[0007] The oil tank is connected to the high-pressure pump via an oil circuit, and the high-pressure pump and the test fixture, as well as the test fixture and the oil tank, are respectively connected via oil circuits provided with a plurality of valve bodies;

[0008] The test fixture includes a fixed frame and an actuator, a movable frame, and a force sensor arranged in sequence on the fixed frame along a first direction; the force sensor is fixed to the fixed frame by a plurality of connecting rods; the movable frame is movably connected to the fixed frame on both sides along the first direction, and the side of the movable frame close to the actuator is connected to the output end of the actuator, so that the movable frame can be driven by the actuator to move back and forth relative to the fixed frame in the first direction; accordingly, a displacement component is provided corresponding to the movable frame for real-time monitoring of the displacement distance of the movable frame;

[0009] The movable frame is provided with a hydraulic oil passage connected to the oil circuit, and two mounting seats connected to the hydraulic oil passage are provided on the movable frame in a first direction. A plunger bracket is provided between the two mounting seats and is fixedly mounted on the force sensor via a plurality of connecting rods, so that the force sensor can measure the force applied by the plunger bracket in real time. The plunger bracket is provided with mounting holes on both sides along the first direction, and a cup-shaped container is provided on each of the two mounting seats, which can seal the floating cavity of the plunger pair on the mounting seat, and a hydraulic oil collector is provided on each of the two cup-shaped containers, which can collect hydraulic oil overflowing from the plunger pair.

[0010] Then the tested piece and the corresponding control piece can be symmetrically installed on both sides of the plunger bracket along the first direction; at this time, the floating cavities of the tested piece and the control piece are respectively sealed and assembled on the corresponding mounting seats by cup-shaped containers, and each floating cavity is connected to the hydraulic oil channel; and the plungers of the tested piece and the control piece are respectively extended from the corresponding cup-shaped containers and embedded in the corresponding mounting holes connected to the plunger bracket.

[0011] As a further improvement of the present invention, the displacement assembly includes correspondingly arranged displacement sensors and magnetic scales;

[0012] One of the displacement sensor and the magnetic scale is arranged on the movable frame, and the other is arranged on the fixed frame or the plunger bracket.

[0013] As a further improvement of the present invention, an oil pressure sensor and a temperature sensor connected to the hydraulic oil channel are provided on the mobile frame to monitor the hydraulic oil pressure and oil temperature in the hydraulic oil channel in real time.

[0014] As a further improvement of the present invention, the cup-shaped container includes an assembly sleeve and a fixed sleeve, both of which are cylindrical structures and can be detached from each other;

[0015] The floating cavity can be coaxially embedded in the assembly sleeve and sealed with it; one end of the fixed sleeve is sealed and sleeved on the outer periphery of the assembly sleeve, and the other end can be sleeved on the mounting seat, so that the floating cavity is connected to the oil circuit formed in the mounting seat.

[0016] As a further improvement of the present invention, the cup-shaped container further comprises a connecting sleeve, and an embedding hole communicating with the hydraulic oil channel is opened on the mounting seat corresponding to the connecting sleeve;

[0017] An oil passage hole is axially opened in the connecting sleeve and can be coaxially embedded in the embedding hole; and the end of the connecting sleeve protrudes from the embedding hole and can be sleeved with the end of the assembly sleeve.

[0018] As a further improvement of the present invention, a sealing ring is provided along the circumferential direction on the inner peripheral wall surface of the assembly sleeve to achieve sealing between the assembly sleeve and the outer periphery of the floating cavity;

[0019] and / or

[0020] A limiting portion is provided on the inner periphery of the end portion of the assembly sleeve for extending the plunger along an annular direction. The inner diameter of the limiting portion is smaller than the outer diameter of the floating cavity, so as to realize axial limitation of the floating cavity in the assembly sleeve.

[0021] As a further improvement of the present invention, the fixed frame and the movable frame are respectively C-shaped or U-shaped;

[0022] The two sides of the movable frame along the first direction are movably connected to the two free ends of the fixed frame through a plurality of connecting rods penetrating the fixed frame; and the two mounting seats are relatively arranged on the two free ends of the movable frame.

[0023] As a further improvement of the present invention, the plunger bracket is assembled and connected to the force sensor through a plurality of force transmission rods passing through the fixing frame;

[0024] and / or

[0025] At least one side of the movable frame along the first direction is movably connected to the fixed frame through a plurality of parallel connecting rods.

[0026] Another aspect of the present invention further provides a method for testing a plunger pair of a floating cavity type plunger pump, which is implemented using the plunger pair testing device for a floating cavity type plunger pump, and includes the following steps:

[0027] (1) Assemble the plunger pair test device and prepare the plunger pair test piece and reference piece; the setting size of the reference piece is the same as that of the test piece, and the only difference is that the assembly gap between the plunger of the reference piece and the floating cavity is increased to eliminate friction between the two during the test;

[0028] (2) Using two cup-shaped containers, the test piece and the reference piece are respectively mounted on the two mounting seats on both sides of the plunger bracket, and the ends of the two plungers are respectively embedded and mounted in the mounting holes; thereafter, a hydraulic oil collector is provided below the assembly position of the plunger of the test piece and the floating cavity;

[0029] (3) Set the control parameters of the plunger pair test device with reference to the operating parameters of the plunger pump, start the high-pressure pump and the actuator, simulate the operation process of the plunger pair in the plunger pump, and continue for a certain period of time; during the test, monitor the displacement data of the moving frame in real time through the displacement sensor, monitor the force data transmitted by the plunger bracket in real time through the force sensor, and collect and measure the amount of hydraulic oil overflowing from the test piece through the hydraulic oil collector;

[0030] (4) Based on the displacement data, force data and hydraulic oil leakage data, the friction force, friction loss and hydraulic oil leakage between the plunger and the floating cavity of the test piece are judged to characterize the performance of the test piece and complete the test of the plunger pair.

[0031] As a further improvement of the present invention, in step (2), the plunger ends of the tested piece and the control piece are respectively assembled with the mounting holes on the plunger bracket by cold mounting.

[0032] The above-mentioned improved technical features can be combined with each other as long as they do not conflict with each other.

[0033] In general, the above technical solutions conceived by the present invention have the following beneficial effects compared with the prior art:

[0034] (1) The plunger pair test device of the present invention is suitable for a floating cavity type plunger pump, which includes an oil circuit system connected in sequence by an oil tank, a high-pressure pump, a test fixture and other components. By utilizing the combined arrangement of the actuator, the mobile frame, the fixed frame, the force sensor and the plunger bracket in the test fixture, and the corresponding arrangement of the two cup-shaped containers on the mobile frame, the plunger pair to be tested can be sealed and assembled on the mobile frame with reference to the arrangement in the plunger pump, thereby realizing the test of the friction force, friction loss and hydraulic oil leakage between the floating cavity and the plunger in the plunger pair under test, completing the accurate characterization of the performance parameters of the plunger pair, providing a reliable basis for the processing, assembly and application of the plunger pair, and thereby improving the reliability of the arrangement and application of the plunger pump.

[0035] (2) The plunger pair testing device of the present invention, which is suitable for a floating cavity type plunger pump, can quickly realize the sealed assembly of the floating cavity in the assembly sleeve and the sealed installation on the mounting seat by optimally designing the structural composition of the cup-shaped container and utilizing the mutual assembly of the connecting sleeve, the assembly sleeve and the fixed sleeve and the corresponding arrangement of the sealing parts in the assembly sleeve. It ensures the sealing performance of the plunger pair assembly while simplifying the assembly process of the plunger pair and improving the efficiency and accuracy of the plunger pair testing.

[0036] (3) The plunger pair testing device of the present invention, which is suitable for a floating cavity type plunger pump, has a structure in which the fixed frame and the movable frame are preferably arranged so that the installation between the two and the force sensor can be carried out accurately, thereby ensuring the reliability of the mechanism operation and simplifying the mechanism setting process; at the same time, by using the setting of corresponding limit rings, limit protrusions and other mechanisms, the reliability and accuracy of the plunger pair setting can be fully guaranteed.

[0037] (4) The plunger pair testing method of the present invention, which is applicable to a floating cavity type plunger pump, is implemented by using a plunger pair testing device. The steps are simple and the operation is convenient. It can quickly realize the alignment installation of the tested part and the reference part on the mobile frame, and accurately simulate the setting form of the plunger pair in the plunger pump. At the same time, by preferably setting the gap between the plunger and the floating cavity in the reference part, the result of the force sensor detection can directly represent the friction force between the plunger of the tested part and the floating cavity, providing an accurate basis for the calculation of friction loss, and then accurately completing the test of the plunger pair, providing an accurate basis for the design, processing and assembly of the plunger pair, and ensuring the reliability of the assembly application of the plunger pump.

[0038] (5) The plunger pair testing device and method for a floating cavity type plunger pump in the present invention have a simple structure and a convenient testing process. They can fully simulate the arrangement of the plunger pair in the floating cavity type plunger pump, achieve accurate testing of a single plunger pair, obtain the friction force, friction loss and hydraulic oil leakage between the plunger and the floating cavity, provide an accurate basis for the characterization and optimization design of the plunger pair performance, ensure the accuracy and reliability of the design and use of the floating cavity type plunger pump, and have good practical value. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0040] Figure 1 1 is a schematic structural diagram of a plunger pair testing device applicable to a floating cavity type plunger pump according to an embodiment of the present invention;

[0041] Figure 2 2 is a schematic diagram of the testing principle of the plunger pair testing device according to an embodiment of the present invention;

[0042] Figure 3 2. It is a schematic diagram of the installation and setting of the test fixture of the plunger pair test device according to an embodiment of the present invention;

[0043] Figure 4 1 is a schematic diagram of a partial structure of a test fixture of a plunger pair test device according to an embodiment of the present invention;

[0044] Figure 5 This is a schematic diagram of the assembly of the test fixture of the plunger pair test device according to an embodiment of the present invention during testing;

[0045] In all the drawings, the same reference numerals represent the same technical features, specifically:

[0046] 1. Frame; 2. Fuel tank; 3. High-pressure pump; 4. Test fixture; 5. Test piece; 6. Reference piece;

[0047] 401, fixed frame; 402, movable frame; 4021, hydraulic oil channel; 4022, mounting base; 403, oil pressure sensor; 404, temperature sensor; 405, displacement sensor; 406, force sensor; 407, cup-shaped container; 4071, connecting sleeve; 4072, assembly sleeve; 4073, fixed sleeve; 4074, sealing ring; 408, plunger bracket; 409, actuator; 410, connecting rod; 411, force transmission rod; 412, chassis;

[0048] 501. Floating chamber; 502. Plunger. DETAILED DESCRIPTION

[0049] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only intended to illustrate the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

[0050] In the description of the present invention, it should be understood that, unless otherwise expressly specified and limited, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as limiting the present invention.

[0051] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0052] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0053] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0054] The plunger pair testing device of the present invention, which is suitable for a floating cavity plunger pump, is intended to simulate the actual assembly form of the plunger pair in the floating cavity plunger pump, and on this basis complete the plunger pair testing process, test the friction force and oil leakage between the floating cavity 501 and the plunger 502 in the plunger pair, thereby characterizing the actual performance of the tested plunger pair, and then providing a basis for the assembly, debugging and application of the plunger pair.

[0055] In order to achieve the above purpose, in a preferred embodiment, a plunger pair testing device suitable for a floating cavity plunger pump is designed, such as Figure 2 As shown in . As follows, it is described in detail through a specific embodiment.

[0056] Example:

[0057] See also Figures 1 to 5 The testing principle of the plunger pair testing device for a floating cavity type plunger pump in the preferred embodiment of the present invention is as follows: Figure 2 As shown in , the plunger pair to be tested (i.e., the tested component 5) is simulated installed according to its setting form in the plunger pump and then the oil circuit test is performed to detect the corresponding friction force and oil leakage.

[0058] At the same time, based on the above test principle, the preferred embodiment is provided with the following Figure 1 The plunger pair testing device shown in the figure includes a frame-type frame 1, on which are correspondingly provided an oil tank 2, a high-pressure pump 3, and a testing tool 4 connected by a circulation pipeline. Corresponding valve bodies are correspondingly provided on the circulation pipeline to ensure the reliability of the circulation pipeline operation.

[0059] Based on the combined arrangement of the above mechanisms on the frame 1 , the tested piece 5 of the plunger pair can be simulated and installed on the test fixture 4 , thereby simulating the working process of the plunger pair in the plunger pump to complete the test.

[0060] For the test fixture 4 in the preferred embodiment, its structure is as follows: Figure 3 、 Figure 4 As shown in FIG, it includes a fixed frame 401 fixedly mounted on the frame 1 and a movable frame 402 movably assembled on the fixed frame 401 . Correspondingly, the movable frame 402 is further provided with a plunger bracket 408 and an actuator 409 .

[0061] Among them, the plunger bracket 408 is relatively fixed to the fixing frame 401, that is, it does not move relative to the fixing frame 401. The plunger bracket 408 in the preferred embodiment is used to fix one end of the plunger 502 of the plunger pair, specifically, to fix the end of the plunger 502 away from the floating cavity 501.

[0062] At the same time, the actuator 409 is set on the frame 1, and its output end is connected to one end of the movable frame 402, so that the movable frame 402 can be driven to perform reciprocating motion in the first direction through the control of the actuator 409. By controlling the working parameters of the actuator 409, the action process of the plunger pair in the plunger pump can be effectively simulated.

[0063] In a specific preferred embodiment, the actuator 409 is preferably a servo motor, whose output shaft is connected to one end of the movable frame 402 via a connecting rod 410 that passes through the fixed frame 401. In this case, one end of the movable frame 402 is movably connected to the fixed frame 401 via a plurality of connecting rods 410. Correspondingly, the other end of the movable frame 402 along the first direction is movably connected to the other end of the fixed frame 401 via a plurality of connecting rods 410.

[0064] Based on the movable connection between the movable frame 402 and the fixed frame 401 at both ends along the first direction, the actuator 409 can reciprocate and drive the movable frame 402 along the first direction, thereby simulating the actual operation state of the plunger pair in the plunger pump.

[0065] In more detail, for the mobile frame 402 in the preferred embodiment, a hydraulic oil channel 4021 for the passage of hydraulic oil is provided inside it. One end of the hydraulic oil channel 4021 is connected to the high-pressure pump 3 through a number of valve bodies, and the other end is connected to the oil tank 2 through a number of valve bodies, so as to simulate the oil circuit system in the plunger pump.

[0066] In actual setting, considering the assembly setting between components, the fixed frame 401 and the movable frame 402 in the preferred embodiment are preferably set as follows: Figure 3 In the “C-shaped” or “U-shaped” structure shown in the figure, the movable frame 402 is arranged in a corresponding position inside the fixed frame 401 , and its two free ends are movably connected to the two free ends of the fixed frame 401 through connecting rods 410 respectively.

[0067] Preferably, in order to ensure reliable support and stable displacement of the mobile frame 402, at least two connecting rods 410 are arranged side by side on at least one side of the mobile frame 402 along the first direction in a preferred embodiment. Figure 4 In the preferred embodiment shown, the connecting rods 410 on the right side of the movable frame 402 are two parallel and spaced apart.

[0068] It can be understood that for the fixed frame 401 and the movable frame 402, their setting forms are not limited to the above-mentioned setting forms, such as a ring frame form or other assembled forms, as long as the support requirements of the fixed frame 401 for the movable frame 402 and other corresponding components and the relative displacement requirements of the movable frame 402 can be met.

[0069] By utilizing the above structural design of the movable frame 402 , the tested object 5 can be correspondingly arranged between the two free ends of the movable frame 402 .

[0070] Furthermore, corresponding to the assembly arrangement of the test piece 5 on the mobile rack 402, two cup-shaped containers 407 are preferably arranged on the mobile rack 402 along the first direction, and the two cup-shaped containers 407 are symmetrically arranged, such as Figure 4 As shown in .

[0071] In order to install the corresponding cup-shaped container 407 on the mobile frame 402, two mounting seats 4022 are preferably coaxially arranged on the mobile frame 402, and embedding holes connecting to the hydraulic oil channel 4021 on the mobile frame 402 are coaxially opened in the middle of the two mounting seats 4022. The two ends of the hydraulic oil channel 4021 are connected respectively by the setting of the two mounting seats 4022.

[0072] In more detail, the cup-shaped container 407 in the preferred embodiment is as follows Figure 5 As shown in , it includes a coaxially assembled connecting sleeve 4071, an assembly sleeve 4072, and a fixed sleeve 4073. An oil passage hole is formed in the middle of the connecting sleeve 4071, whose outer diameter matches the inner diameter of the embedding hole on the mounting seat 4022, so that one end of the connecting sleeve 4071 can be precisely embedded in the embedding hole and axially limited.

[0073] In a preferred embodiment, a limiting protrusion is radially protruding from one end of the outer periphery of the connecting sleeve 4071 to provide axial positioning for the connecting sleeve 4071 after insertion. Furthermore, the end of the connecting sleeve 4071 protruding from the insertion hole is preferably capable of being slotted into the end of the assembly sleeve 4072, thereby achieving rapid alignment and sealed assembly between the two.

[0074] At the same time, the assembly sleeve 4072 in the preferred embodiment is a cylindrical structure with openings at both ends, wherein the inner diameter of the middle part is not less than the outer diameter of the floating cavity 501 of the measured part 5. The measured part 5 can be embedded in the assembly sleeve 4072 with its floating cavity 501 correspondingly, and the plunger 502 of the measured part 5 extends from one end of the assembly sleeve 4072.

[0075] In actual settings, corresponding to the limiting of the floating cavity 501 in the assembly sleeve 4072, a limiting portion is protrudingly provided on the inner circumferential wall surface of the assembly sleeve 4072. The limiting portion is further preferably a convex ring with an inner diameter smaller than the outer diameter of the floating cavity 501, so as to realize the axial limiting of the floating cavity 501 in the assembly sleeve 4072.

[0076] More specifically, to ensure the accuracy of the test results and ensure that the collected hydraulic oil comes from leakage in the assembly gap between the floating cavity 501 and the plunger 502, the test piece 5 in the preferred embodiment needs to be assembled on the mounting seat 4022 in a sealed state.

[0077] More specifically, a sealing member is provided on the inner periphery of the mounting sleeve 4072 to achieve a sealed assembly between the floating cavity 501 and the inner circumferential wall of the mounting sleeve 4072. Furthermore, sealing members are preferably provided between the various components of the cup-shaped container 407 and between the contact areas between the cup-shaped container 407 and the mounting seat 4022. For example, a sealing ring is provided on the end surface of the mounting seat 4022, or a sealing ring is provided between the connecting sleeve 4071 and the mounting sleeve 4072.

[0078] In a preferred embodiment, the sealing member provided on the inner periphery of the assembly sleeve 4072 is a plurality of coaxially arranged sealing rings 4074, for example Figure 5 In actual arrangement, corresponding to the arrangement of the sealing ring 4074, it is preferred that an installation groove is provided on the inner peripheral wall surface of the assembly sleeve 4072 along the annular direction.

[0079] In addition, in order to achieve rapid positioning and assembly of the assembly sleeve 4072 and the connecting sleeve 4071, it is preferred to set the end of the assembly sleeve 4072 away from the limiting portion to a form with an inner diameter corresponding to the outer diameter of the connecting sleeve 4071, so that the end of the connecting sleeve 4071 can be just embedded in the end of the assembly sleeve 4072, thereby achieving abutment assembly between the end of the floating cavity 501 in the assembly sleeve 4072 and the end of the connecting sleeve 4071.

[0080] The sealed assembly of the tested component 5 on the mounting seat 4022 can effectively ensure the accuracy of the hydraulic oil measurement results, and ensure that the collected hydraulic oil is leaked from the assembly gap between the floating cavity 501 and the plunger 502.

[0081] Furthermore, in the preferred embodiment, the sealing sleeve of the fixed sleeve 4073 is arranged on the outer periphery of the mounting sleeve 4072, and can be axially limited with the mounting sleeve 4072, and its other end can be sleeved on the mounting seat 4022, so that the floating cavity 501 of the measured part 5 is connected to the oil channel formed on the mounting seat 4022.

[0082] In a preferred embodiment, an annular limiting protrusion is formed on the inner wall surface of one end of the fixed sleeve 4073, and an annular step is formed on the outer periphery of the end of the mounting sleeve 4072 that is connected to the connecting sleeve 4071. The cooperation between the annular limiting protrusion and the annular step can achieve axial limitation between the two. At the same time, an internal thread is formed on the inner wall surface of the other end of the fixed sleeve 4073, and an external thread is formed on the outer periphery of the mounting seat 4022. The two can be quickly connected and assembled in a threaded connection manner, forming a Figure 5 The assembly structure shown in .

[0083] according to Figure 5As can be readily seen from the diagram, in actual configuration, the oil hole provided in the connecting sleeve 4071 is also directly provided in the mounting seat 4022 as required. In this case, the connecting sleeve 4071 and the mounting seat 4022 can be considered to be integrally provided. Accordingly, the cup-shaped container 407 only requires the assembly sleeve 4072, which can be sealably mounted on the outer periphery of the floating chamber 501, and the fixing sleeve 4073, which can sealably mount the assembly sleeve 4072 on the mounting seat 4022.

[0084] The matching arrangement of the cup-shaped container 407 and the mounting base 4022 allows for rapid clamping and securing of the test piece 5. Furthermore, the open end of the assembly sleeve 4072 allows hydraulic oil leaking through the gap between the plunger 502 and the floating chamber 501 to overflow from the end of the assembly sleeve 4072. This oil can then be collected to determine the amount of hydraulic oil leakage from the test piece 5.

[0085] Preferably, considering that a limiting portion is provided at the end of the mounting sleeve 4072, which has a certain blocking effect on the hydraulic oil leaking in the sleeve, in a preferred embodiment, an oil drain hole is preferably opened on the cylinder wall on the inner side of the limiting portion and passes through the outer periphery of the end of the mounting sleeve 4072. When setting the mounting sleeve 4072, the oil drain hole is preferably set downward so that the hydraulic oil leaked between the floating cavity 501 and the plunger 502 can be collected as much as possible, thereby ensuring the accuracy of the plunger pair test results.

[0086] In actual configuration, the configuration and assembly of the two cup-shaped containers 407 are the same and will not be described in detail here.

[0087] At the same time, corresponding to the arrangement of the test piece 5, another plunger pair is preferably assembled and installed in another cup-shaped container 407, serving as a reference piece 6. The machining dimensions of the reference piece 6 in the preferred embodiment are substantially the same as those of the test piece 5. The major difference lies in the fact that during machining, a larger assembly clearance must be ensured between the floating cavity 501 and the plunger 502. This ensures that there is virtually no friction between the floating cavity 501 and the plunger 502 of the reference piece 6 during testing, thereby ensuring that the force sensor 406 exerts no friction on the floating cavity 501 and the plunger 502 in the test piece 5.

[0088] Furthermore, to simulate the setup of the test piece 5 and the reference piece 6 on the mobile frame 402, a plunger bracket 408 is fixedly mounted between the two cup-shaped containers 407. Mounting holes are provided on either side of the bracket along the first direction, allowing for the embedded installation of the ends of the two plungers 502. Furthermore, to test the friction force of the test piece 5, a force sensor 406 is also fixedly mounted on the fixed frame 401.

[0089] Specifically, if Figure 3As shown in the figure, the force sensor 406 in the preferred embodiment is arranged on the side of the plunger bracket 408 away from the test piece 5, and is spaced apart from the movable frame 402 in the first direction. It is preferably fixedly connected to the fixed frame 401 through a plurality of connecting rods 410, that is, the relative position of the force sensor 406 and the fixed frame 401 remains unchanged.

[0090] At the same time, the plunger bracket 408 is preferably fixed to the force sensor 406 through a plurality of force transmission rods 411, for example Figure 5 The two force transmission rods 411 shown in FIG. One end of the force transmission rod 411 is fixedly connected to the plunger bracket 408, and the other end thereof is assembled with the force sensor 406.

[0091] During the operation of the floating cavity, due to the symmetrical arrangement of the two plunger pairs on both sides of the plunger bracket 408 and the two plunger pairs being connected to the same oil circuit, the pressure exerted by the hydraulic oil on the two plungers 502 cancels each other out. In addition, a large clearance is reserved between the plunger 502 of the reference part 6 and the floating cavity 501, so there is almost no friction between the two. At this time, the force measured by the force sensor 406 is the friction between the plunger 502 in the measured part 5 and the floating cavity 501.

[0092] Furthermore, in order to ensure the accuracy of monitoring the test process, it is preferred that an oil pressure sensor 403 and a temperature sensor 404 are matched with the hydraulic oil channel 4021 on the movable frame 402 to detect the oil supply pressure and temperature in the oil circuit in real time, thereby ensuring that the test process of the test piece 5 corresponds to the actual working process of the plunger pair in the plunger pump.

[0093] At the same time, in order to monitor the plunger movement process of the test piece 5 in real time, a displacement detection component is also provided on the movable frame 402, which preferably includes a displacement sensor 405 and a magnetic scale arranged corresponding thereto. The displacement sensor 405 and the magnetic scale are arranged on two components that can move relative to each other, such as the fixed frame 401 and the movable frame 402, or the movable frame 402 and the plunger bracket 408.

[0094] In a preferred embodiment, a displacement sensor 405 is mounted on the side of the movable frame 402 near the plunger support 408; correspondingly, a magnetic scale is fixedly mounted on the plunger support 408. By utilizing the corresponding arrangement of the two, the distance moved by the movable frame 402 relative to the plunger support 408 can be measured. Combined with the friction force measured by the force sensor 406, the friction loss during the movement of the measured object 5 can be determined.

[0095] Since the control member 6 increases the gap between the plunger 502 and the floating cavity 501 when it is set, it will cause a certain amount of oil leakage during actual operation. In order to prevent the hydraulic oil from being scattered and polluted and to achieve the recycling of the hydraulic oil, a chassis 412 is also provided under the mobile frame 402. Figure 2At the same time, a separate hydraulic oil collector is provided on the chassis 412 corresponding to the test piece 5, which is further preferably a measuring cup, so as to accurately collect the leaked liquid during the test of the test piece 5, and then determine whether the assembly clearance of the test piece 5 is qualified according to the amount of leakage.

[0096] During actual setting, for the testing of multiple test pieces 5 of the same size model, they can share the same reference piece 6. Therefore, after completing the installation and setting of one reference piece 6, multiple test pieces 5 can be tested, and it is only necessary to replace the corresponding plunger pairs to be tested.

[0097] Through the corresponding setting of the above-mentioned plunger pair testing device, the assembly and testing of the plunger pair test piece 5 can be realized, and the friction force, friction loss and leakage amount between the floating cavity 501 and the plunger 502 of the test piece 5 can be obtained, providing a basis for the evaluation of the plunger pair performance and the optimal design of the plunger pair structure.

[0098] It is readily understood that, after completing the corresponding configuration of the aforementioned testing apparatus, different sizes of plunger assemblies can be assembled and fixed by replacing the cup-shaped container 407 with a different specification, thereby completing the testing of plunger assemblies of different specifications. Therefore, in a preferred embodiment, the cup-shaped container 407 is preferably available in a variety of specifications to enable the assembly and placement of plunger assemblies of different sizes and specifications under test 5 on the mobile frame 402.

[0099] In addition, based on the corresponding settings of the high-pressure pump 3 and the actuator 409 in the plunger pair testing device, different working condition adjustments can be accurately simulated to realize plunger pair testing under different oil pressures, different speeds, and different fitting clearances, fully ensuring the versatility and applicability of the plunger pair testing device.

[0100] As another aspect of the present invention, a plunger pair testing method applicable to a floating cavity plunger pump is preferably provided based on the aforementioned plunger pair testing device, which preferably includes the following steps:

[0101] (1) Assemble and set up the plunger pair test device and prepare the plunger pair test piece 5 and reference piece 6;

[0102] The setting size of the reference piece 6 is the same as that of the tested piece 5 , and the only difference is that the assembly gap between the plunger 502 of the reference piece 6 and the floating cavity 501 is enlarged to ensure that there is no friction between the two during the test.

[0103] (2) The test piece 5 and the reference piece 6 are respectively assembled in the two cup-shaped containers on both sides of the plunger bracket 408, and the plungers 502 of the two plunger pairs are extended out of the cup-shaped containers 407, and the ends are embedded in the two mounting holes on both sides of the plunger bracket 408 along the first direction; accordingly, a hydraulic oil collector is provided below the assembly position of the plunger 502 of the test piece 5 and the floating cavity 501;

[0104] When assembling the two ends of the plunger 502 with the two mounting holes respectively, it is preferred to adopt a cold installation method, using the principle of thermal expansion and contraction to make the outer diameter of the end of the plunger 502 shrink due to the cold, thereby achieving rapid assembly of the end of the plunger 502 in the mounting hole.

[0105] More preferably, in a preferred embodiment, before assembling the two plunger pairs, the two plunger pairs are preferably placed in a liquid nitrogen environment for a period of time.

[0106] (3) Setting the control parameters of the plunger pair test device with reference to the operating parameters of the plunger pump, and starting the high-pressure pump 3 and the actuator 409 accordingly, simulating the operation process of the plunger pair in the plunger pump, and continuing for a certain period of time; during the operation, the displacement data of the movable frame 402 is monitored in real time by the displacement sensor 405, the force data transmitted by the plunger bracket 408 is monitored in real time by the force sensor 406, and the hydraulic oil leaked through the assembly gap between the floating cavity 501 of the test piece 5 and the plunger 502 is collected by the hydraulic oil collector;

[0107] In a preferred embodiment, the time for a single run is preferably 1 minute. It is understood that the time length for a single run test can be increased or decreased according to the needs of the actual setting, which will not be described in detail here.

[0108] (4) Based on the displacement data, force data and hydraulic oil leakage data, the friction force, friction loss and hydraulic oil leakage between the plunger 502 of the test piece 5 and the floating cavity 501 are determined to characterize the performance of the test piece 5, thereby completing the test of the plunger pair.

[0109] The present invention is suitable for the plunger pair testing device and method of a floating cavity plunger pump. The device has a simple structure and a convenient testing process. It can fully simulate the arrangement of the plunger pairs in the floating cavity plunger pump, realize accurate testing of a single plunger pair, obtain the friction force, friction loss and hydraulic oil leakage between the plunger and the floating cavity, provide an accurate basis for the characterization and optimization design of the plunger pair performance, ensure the accuracy and reliability of the design and use of the floating cavity plunger pump, and have good practical value.

[0110] It will be easily understood by those skilled in the art that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A plunger pair testing device suitable for a floating cavity plunger pump, characterized in that: Includes fuel tank, high-pressure pump and test fixture; The oil tank is connected to the high-pressure pump via an oil circuit, and the high-pressure pump and the test fixture, as well as the test fixture and the oil tank, are respectively connected via oil circuits provided with a plurality of valve bodies; The test fixture includes a fixed frame and an actuator, a movable frame, and a force sensor sequentially arranged along a first direction; the force sensor is fixed to the fixed frame via a plurality of connecting rods; the movable frame is movably connected to the fixed frame on both sides along the first direction, and the side of the movable frame close to the actuator is connected to the output end of the actuator, so that the movable frame can be driven by the actuator to move back and forth relative to the fixed frame in the first direction; accordingly, a displacement component is provided corresponding to the movable frame for real-time monitoring of the displacement distance of the movable frame; The movable frame is provided with a hydraulic oil passage connected to the oil circuit, and two mounting seats connected to the hydraulic oil passage are provided on the movable frame in a first direction. A plunger bracket is provided between the two mounting seats and is fixedly mounted on the force sensor via a plurality of connecting rods, so that the force sensor can measure the force applied by the plunger bracket in real time. The plunger bracket is provided with mounting holes on both sides along the first direction, and a cup-shaped container is provided on each of the two mounting seats, which can seal the floating cavity of the plunger pair on the mounting seat, and a hydraulic oil collector is provided on each of the two cup-shaped containers, which can collect hydraulic oil overflowing from the plunger pair. Then the tested piece and the corresponding control piece can be symmetrically installed on both sides of the plunger bracket along the first direction; at this time, the floating cavities of the tested piece and the control piece are respectively sealed and assembled on the corresponding mounting seats by cup-shaped containers, and each floating cavity is connected to the hydraulic oil channel; and the plungers of the tested piece and the control piece are respectively extended from the corresponding cup-shaped containers and embedded in the corresponding mounting holes connected to the plunger bracket.

2. The plunger pair testing device for a floating cavity type plunger pump according to claim 1, characterized in that: The displacement assembly includes a correspondingly arranged displacement sensor and a magnetic scale; One of the displacement sensor and the magnetic scale is arranged on the movable frame, and the other is arranged on the fixed frame or the plunger bracket.

3. The plunger pair testing device for a floating cavity type plunger pump according to claim 2, characterized in that: An oil pressure sensor and a temperature sensor connected to the hydraulic oil channel are provided on the mobile frame to monitor the hydraulic oil pressure and oil temperature in the hydraulic oil channel in real time.

4. The plunger pair testing device for a floating cavity type plunger pump according to any one of claims 1 to 3, characterized in that: The cup-shaped container comprises an assembly sleeve and a fixed sleeve, both of which are cylindrical in structure and can be detached from each other; The floating cavity can be coaxially embedded in the assembly sleeve and sealed with it; one end of the fixed sleeve is sealed and sleeved on the outer periphery of the assembly sleeve, and the other end can be sleeved on the mounting seat, so that the floating cavity is connected to the oil circuit formed in the mounting seat.

5. The plunger pair testing device for a floating cavity type plunger pump according to claim 4, characterized in that: The cup-shaped container further includes a connecting sleeve, and an embedding hole communicating with the hydraulic oil channel is opened on the mounting seat corresponding to the connecting sleeve; An oil passage hole is axially opened in the connecting sleeve and can be coaxially embedded in the embedding hole; and the end of the connecting sleeve protrudes from the embedding hole and can be sleeved with the end of the assembly sleeve.

6. The plunger pair testing device for a floating cavity type plunger pump according to claim 4, characterized in that: A sealing ring is provided on the inner peripheral wall surface of the assembly sleeve along the circumferential direction to achieve sealing between the assembly sleeve and the outer periphery of the floating cavity; and / or A limiting portion is provided on the inner periphery of the end portion of the assembly sleeve for extending the plunger along an annular direction. The inner diameter of the limiting portion is smaller than the outer diameter of the floating cavity, so as to realize axial limitation of the floating cavity in the assembly sleeve.

7. The plunger pair testing device for a floating cavity type plunger pump according to any one of claims 1 to 3, 5 and 6, characterized in that: The fixed frame and the movable frame are respectively C-shaped or U-shaped; The two sides of the movable frame along the first direction are movably connected to the two free ends of the fixed frame through a plurality of connecting rods penetrating the fixed frame; and the two mounting seats are relatively arranged on the two free ends of the movable frame.

8. The plunger pair testing device for a floating cavity type plunger pump according to claim 7, characterized in that: The plunger bracket is assembled and connected to the force sensor through a plurality of force transmission rods passing through the fixing frame; and / or At least one side of the movable frame along the first direction is movably connected to the fixed frame through a plurality of parallel connecting rods.

9. A method for testing a plunger pair of a floating cavity type plunger pump, which is implemented using the plunger pair testing device for a floating cavity type plunger pump according to any one of claims 1 to 8, characterized in that: The steps include: (1) Assemble the plunger pair test device and prepare the plunger pair test piece and reference piece; the setting size of the reference piece is the same as that of the test piece, and the only difference is that the assembly gap between the plunger of the reference piece and the floating cavity is increased to eliminate friction between the two during the test; (2) Using two cup-shaped containers, the test piece and the reference piece are respectively mounted on the two mounting seats on both sides of the plunger bracket, and the ends of the two plungers are respectively embedded and mounted in the mounting holes; thereafter, a hydraulic oil collector is provided below the assembly position of the plunger of the test piece and the floating cavity; (3) Set the control parameters of the plunger pair test device according to the operating parameters of the plunger pump, start the high-pressure pump and the actuator, simulate the operation process of the plunger pair in the plunger pump, and continue for a certain period of time; During the test, the displacement data of the moving frame is monitored in real time by the displacement sensor, the force data transmitted by the plunger bracket is monitored in real time by the force sensor, and the volume of hydraulic oil overflowing from the test piece is collected and measured by the hydraulic oil collector; (4) Based on the displacement data, force data and hydraulic oil leakage data, the friction force, friction loss and hydraulic oil leakage between the plunger and the floating cavity of the test piece are judged to characterize the performance of the test piece and complete the test of the plunger pair.

10. The plunger pair testing method for a floating cavity plunger pump according to claim 9, characterized in that: In step (2), the plunger ends of the test piece and the reference piece are respectively assembled with the mounting holes on the plunger bracket by cold mounting.

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