A device and method for measuring stirring loss of a plunger pump with a reciprocating and telescopic plunger-shoe assembly

Abstract

The present invention provides a device and method for measuring the stirring loss of a plunger pump with a reciprocating and telescopic plunger-slipper assembly, comprising a reciprocating conversion module and a stirring loss measurement module. The reciprocating conversion module is used to realize the reciprocating and telescopic motion of the integrated plunger-slipper assembly, and comprises a right-angle bent rod, a push-pull disc, a support frame and a base. The stirring loss measurement module is used to measure, calculate, record and display the stirring loss of the plunger pump. When the stirring area of ​​the stirring loss measurement module is filled with hydraulic oil and emptied of hydraulic oil, the torque exerted on the integrated cylinder body-spindle is measured respectively, and the difference between the two measurement results is calculated to obtain the stirring loss of the plunger pump. The present invention avoids the "burning pump" phenomenon of the dry casing by stripping off the mechanical loss generated by the friction pair of the rotating assembly, and fully considers the simulated working conditions of the reciprocating and telescopic motion of the plunger-slipper assembly, thereby realizing the accurate measurement of the stirring loss.

Description

Technical Field

[0001] The present invention relates to the technical field of axial piston pumps, and in particular to a device and method for measuring stirring loss of a piston pump with a reciprocating and telescopic piston-shoe assembly. Background Art

[0002] Axial piston pumps are the core power components of aerospace hydraulic transmission and control systems. To meet the ever-increasing performance demands of modern spacecraft and aircraft engines, axial piston pumps are continuously developing towards higher speeds and higher pressures. The axial piston pump housing is filled with hydraulic oil, and the stirring motion of the rotating components produces significant stirring losses, including viscous drag losses caused by cylinder rotation and circumferential drag losses caused by the piston-slipper assembly stirring the fluid. Stirring losses not only reduce the operating efficiency of the piston pump but also undermine the stability of the axial piston pump's thermal balance system, severely limiting the service life of the axial piston pump under high-speed and high-pressure conditions. Therefore, accurately measuring and analyzing the stirring loss characteristics of axial piston pumps is of great significance for optimizing the design of high-speed, high-pressure axial piston pumps and improving their service performance.

[0003] Axial piston pumps have complex internal structures and numerous components, with various types of moving parts tightly coupled and interacting with each other. In addition to churning losses, there are also volumetric losses caused by leakage and mechanical losses due to friction between components, which complicates the measurement of churning loss characteristics in axial piston pumps. Existing churning loss measurement devices (e.g., an axial piston pump / motor high-speed rotating component churning loss test device, ZL105201814B) utilize an integrated cylinder-spindle design. The axial position of the plunger-slipper assembly is fixed to prevent direct contact between the slipper bottom and the swash plate. The spindle torque is measured in both an oil-filled wet casing and an oil-free dry casing, and the churning loss of the axial piston pump is calculated from the torque difference. While this eliminates mechanical losses caused by friction in the rotating components, thus preventing "burning" in the dry casing, it fails to reflect the flow field disturbances caused by the reciprocating and telescopic motion of the plunger-slipper assembly under actual operating conditions, resulting in inaccurate assessment of churning loss characteristics. Another stirring loss experimental device (stirring loss test device for rotating components inside axial piston pumps or motors, ZL113685343B) adopts a double swash plate structure design. The support force generated by the contact between the slipper and the swash plate drives the plunger-slipper assembly to reciprocate in the cylinder body. Although it can simulate the impact of the reciprocating motion of the plunger-slipper assembly on the stirring loss characteristics under actual working conditions, the mechanical loss caused by the friction between the slipper and the swash plate cannot be completely eliminated due to the retention of the slipper pair. Therefore, the stirring loss cannot be accurately measured, and long-term measurement in a dry shell will also cause "pump burning".

[0004] Therefore, in order to achieve accurate measurement of the stirring loss characteristics of the axial piston pump, the designed stirring loss measurement device must not only effectively isolate the friction pair of the rotating component, but also accurately simulate the actual working conditions of the reciprocating extension and contraction of the plunger-slipper assembly. Summary of the Invention

[0005] The purpose of the present invention is to address the shortcomings of existing measuring devices and propose a device and method for measuring the stirring loss of a plunger pump with a reciprocating and telescopic plunger-slipper assembly. The device avoids the "burning pump" phenomenon of the dry casing by stripping off the mechanical loss generated by the friction pair of the rotating assembly, and fully considers the simulated working conditions of the reciprocating and telescopic motion of the plunger-slipper assembly, thereby achieving accurate measurement of the stirring loss.

[0006] The technical solution adopted by the present invention is: a device for measuring the stirring loss of a plunger pump with a reciprocating and telescopic plunger-shoe assembly, the device comprising a reciprocating conversion module and a stirring loss measurement module;

[0007] The reciprocating conversion module is used to realize the reciprocating telescopic motion of the integrated plunger-slipper assembly, and includes a right-angle bent rod, a push-pull disc, a support frame and a base;

[0008] The push-pull disc is provided with a support frame mounting hole and a right-angle bent rod push-pull groove, the support frame mounting hole cooperates with the support frame, and the support frame and the base are fixedly connected; the right-angle bent rod push-pull groove passes through the push-pull disc, a guide rail is provided in the right-angle bent rod push-pull groove, the guide rail in the right-angle bent rod push-pull groove is embedded in a sleeve, the inner wall of the right-angle bent rod push-pull groove cooperates with the outer wall of the sleeve, and the right-angle bent rod cooperates with the inner wall of the sleeve; the shape of the right-angle bent rod push-pull groove is designed according to the actual motion trajectory of the plunger-slipper assembly of the axial piston pump;

[0009] The stirring loss measurement module is used to measure, calculate, record and display the stirring loss of the plunger pump, and includes an integrated cylinder-spindle, an integrated plunger-shoe, a swash plate, a housing, a torque sensor, a drive motor and a data acquisition card;

[0010] The integrated cylinder body-spindle has cylinder holes evenly distributed along the circumference of the cylinder body for installing the integrated plunger-slipper; right-angle bent rod through holes are evenly distributed along the circumference of the bottom end surface of the cylinder body and cooperate with the right-angle bent rod; the plunger part of the integrated plunger-slipper is provided with an axial countersunk hole, and the right-angle bent rod is fixedly inserted into the countersunk hole; the shell cooperates with the swash plate near the drive motor end, and the shell cooperates with the integrated cylinder body-spindle away from the drive motor end; the skeleton oil seal is installed between the shell and the integrated cylinder body-spindle; the integrated cylinder body-spindle passes through the swash plate and is connected to the output end of the drive motor through the torque sensor; the enclosed area formed by the shell, the integrated cylinder body-spindle, the integrated plunger-slipper, the swash plate and the skeleton oil seal is the oil stirring area of ​​the stirring loss measurement module; the data acquisition card collects the voltage signal of the torque sensor and calculates the stirring loss when the oil stirring area is filled with hydraulic oil and when the hydraulic oil is exhausted.

[0011] Furthermore, a coordinate system is established at the center of the push-pull disc. The push-pull groove of the right-angle bent rod constrains the push-pull trajectory of the right-angle bent rod to the following relationship:

[0012] ;

[0013] in, represents the position coordinates of the center of the cross section of the right-angled bent rod relative to the center of the push-pull disc, It reflects the projection of the right-angled bent rod on the horizontal plane along the circumferential rotation trajectory of the integrated plunger-shoe. It reflects the projection of the right-angle bent rod along the axial reciprocating telescopic motion trajectory of the integrated plunger-slipper on the horizontal plane, β represents the inclination angle of the swash plate, and R represents the distribution circle radius of the integrated plunger-slipper.

[0014] Furthermore, the right-angle bent rod includes a horizontal section and a vertical section. The horizontal section of the right-angle bent rod cooperates with the integrated cylinder body-main shaft, and the vertical section of the right-angle bent rod cooperates with the sleeve in the push-pull groove of the push-pull disc right-angle bent rod.

[0015] Furthermore, the depth of the cylinder hole of the integrated cylinder block-spindle is greater than the length of the integrated plunger-shoe, but the cylinder hole does not penetrate the integrated cylinder block-spindle.

[0016] Furthermore, the axis of the cylinder hole is located on the distribution circle of the integrated plunger-slipper.

[0017] Furthermore, the O-ring is installed between the right-angle bent rod through hole and the right-angle bent rod.

[0018] Furthermore, the voltage signal of the torque sensor is collected by a data acquisition card when the oil stirring area is filled with hydraulic oil and when the hydraulic oil is exhausted, and the stirring loss of the plunger pump is calculated.

[0019] Furthermore, a gap of 3 mm to 5 mm is provided between the bottom end surface of the integrated plunger-shoe and the end surface of the swash plate.

[0020] Furthermore, a gap of 1 mm is provided between the plunger surface of the integrated plunger-slipper and the inner wall of the cylinder bore.

[0021] On the other hand, the present invention also provides a method for measuring the stirring loss of a plunger pump based on a plunger-shoe assembly reciprocating and telescopic plunger pump stirring loss measuring device, the method comprising the following steps:

[0022] Step 1: Fill the churning area of ​​the plunger pump churning loss measurement device with hydraulic oil, and fill the non-churning area with oil to ensure lubrication; start the drive motor and set the speed. After the output speed stabilizes, start the data acquisition card to collect multiple sets of voltage values ​​representing the torque of the integrated cylinder-spindle, upload them to the host computer, save them, and then turn off the drive motor;

[0023] Step 2: Drain the hydraulic oil in the oil stirring area and fill the non-oil stirring area with oil to ensure lubrication; start the drive motor and set the same speed as in step 1; when the output speed stabilizes, start the data acquisition card, collect the same number of voltage values ​​representing the torque of the integrated cylinder-spindle as in step 1, upload them to the host computer, save them, and then turn off the drive motor;

[0024] Step 3: Take the mean of the multiple voltage values ​​in step 1 and step 2 and make the difference to obtain the stirring loss of the plunger pump at the speed set in step 1;

[0025] Step 4: Change the output speed of the driving motor set in step 1, repeat steps 1 to 3, and obtain a stirring loss characteristic diagram of the piston pump stirring loss-speed.

[0026] The beneficial effects of the present invention are:

[0027] (1) The present invention eliminates the mechanical losses generated by the three major friction pairs of the plunger pump, avoiding the "burning pump" phenomenon under the dry housing. The present invention removes the distribution plate, avoiding the influence of the mechanical losses generated by the friction of the distribution pair on the stirring loss measurement results; a gap is provided between the plunger part of the integrated plunger-slipper and the inner wall of the cylinder hole, avoiding the influence of the mechanical losses generated by the friction of the plunger pair on the stirring loss measurement results; the bottom end face of the integrated plunger-slipper does not contact the end face of the inclined plate, avoiding the influence of the mechanical losses generated by the friction of the slipper pair on the stirring loss measurement results;

[0028] (2) The present invention takes into account the simulated working conditions of the reciprocating telescopic motion of the plunger-slipper assembly. A reciprocating conversion module is provided. According to the actual motion trajectory of the plunger-slipper assembly of the axial piston pump, a push-pull disc and a right-angled rod push-pull groove are designed. Constrained by the push-pull disc and the right-angled rod push-pull groove, the right-angled rod not only rotates circumferentially with the integrated plunger-slipper, but also reciprocates axially along the push-pull trajectory of the right-angled rod given by the center line of the right-angled rod push-pull groove, thereby driving the integrated plunger-slipper to perform axial reciprocating telescopic motion in the cylinder bore. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is an overall framework diagram of the plunger pump stirring loss measuring device with a reciprocating and telescopic plunger-shoe assembly in the present invention;

[0030] Figure 2 This is a diagram showing the internal structure of the device for measuring the stirring loss of a plunger pump in which the plunger-shoe assembly reciprocates and telescopes;

[0031] Figure 3 This is an end view of the bottom of the cylinder body of the integrated cylinder body and main shaft of the present invention;

[0032] Figure 4 This is a diagram of the installation method of the integrated plunger-shoe in the present invention;

[0033] Figure 5 It is a structural diagram of the push-pull disc in the present invention;

[0034] Figure 6 This is a diagram of the installation method of the right-angle bent rod on the push-pull disc in the present invention.

[0035] Description of the drawings: first coupling 1, torque sensor 2, second coupling 3, drive motor 4, data acquisition card 5, host computer 6, base 7, support frame 8, push-pull disc 9, right-angle bent rod 10, skeleton oil seal 11, oil stirring area 12, integrated cylinder body-spindle 13, swash plate 14, integrated plunger-slip shoe 15, housing 16, right-angle bent rod through hole 17, O-ring 18, cylinder hole 19, right-angle bent rod push-pull track 20, support frame mounting hole 21, right-angle bent rod push-pull groove 22, sleeve 23. DETAILED DESCRIPTION

[0036] In order to make the technical solutions, structural features, implementation objectives and technical effects of the present invention more clear, the present invention is described in detail below in conjunction with specific embodiments and the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0037] This embodiment proposes a plunger pump stirring loss measuring device with a reciprocating and telescopic plunger-shoe assembly. The overall frame is referenced Figure 1, its internal structure reference Figure 2 The system includes a reciprocating conversion module for achieving reciprocating and telescopic motion of the integrated plunger-slipper assembly, and a stirring loss measurement module for measuring, calculating, recording, and displaying the stirring loss of the plunger pump. The reciprocating conversion module includes nine right-angled bends, a push-pull disc, three support frames, and a base, while the stirring loss measurement module includes an integrated cylinder block-spindle, nine integrated plunger-slipper assemblies, nine O-rings, a swash plate, a skeleton oil seal, a housing, two couplings, a torque sensor, a drive motor, a data acquisition card, and a host computer.

[0038] In order to reduce the mechanical loss caused by other friction pairs of the plunger pump, the integrated cylinder body-main shaft 13 is formed by integral machining, and the cylinder body and the main shaft form a non-detachable rigid connection; the integrated plunger-slipper 15 is formed by integral machining, and the plunger and the slipper form a non-detachable rigid connection. The cylinder body portion of the integrated cylinder body-main shaft 13 is a cylinder, and 9 cylinder holes 19 are evenly distributed along its circumference for installing the integrated plunger-slipper 15. The cylinder holes 19 do not penetrate the cylinder body, but the depth of the cylinder holes 19 is greater than the length of the integrated plunger-slipper 15. The bottom end face of the cylinder body of the integrated cylinder body-main shaft 13 is as follows: Figure 3 As shown, nine right-angled rod through holes 17 are evenly distributed along the circumference, and the centers of the through holes are located on the distribution circle of the integrated plunger-shoe 15. Each right-angled rod 10 is matched with a right-angled rod through hole 17, and an O-ring 18 is installed between the right-angled rod 10 and the right-angled rod through hole 17 to prevent hydraulic oil leakage. Figure 4 The plunger portion of the integrated plunger-slipper 15 is provided with an axial countersunk hole, and the horizontal end of the right-angle bent rod 10 is fixedly inserted into the countersunk hole, as shown. Figure 4As shown. A gap of 3 mm to 5 mm is retained between the bottom end face of the integrated plunger-slipper 15 and the end face of the swash plate 14, thereby avoiding the influence of the mechanical loss caused by the friction of the slipper pair on the stirring loss measurement result. A gap of 1 mm is retained between the plunger part of the integrated plunger-slipper 15 and the cylinder bore 19, thereby avoiding the influence of the mechanical loss caused by the friction of the plunger pair on the stirring loss measurement result. A skeleton oil seal 11 is installed between the inner wall of the housing 16 and the outer wall of the cylinder part of the integrated cylinder block-main shaft 13 to prevent hydraulic oil leakage. The main shaft part of the integrated cylinder block-main shaft 13 passes through the swash plate 14 and cooperates with the first coupling 1. The enclosed space formed between the housing 16, the swash plate 14, the skeleton oil seal 11, the integrated cylinder block-main shaft 13 and the integrated plunger-slipper 15 is the oil stirring zone 12. The output shaft of the drive motor 4 is connected to the torque sensor 2 via the second coupling 3. The torque sensor 2 is connected to the integrated cylinder-spindle 13 via the first coupling 1, thereby driving the integrated cylinder-spindle 13 to rotate. The torque sensor 2 senses the torque acting on the integrated cylinder-spindle 13, converts it into an analog voltage signal, and transmits it to the data acquisition card 5. The data acquisition card 5 converts the analog voltage signal into a digital voltage signal and transmits it to the host computer 6.

[0039] Since there is a gap between the swash plate 14 and the integrated plunger-slipper 15, the swash plate 14 cannot directly provide the integrated plunger-slipper 15 with a supporting force for reciprocating motion. Therefore, the present invention sets a reciprocating conversion module to realize the axial reciprocating telescopic motion of the integrated plunger-slipper 15. The present invention designs a push-pull disc 9, whose structure is as follows Figure 5 As shown, three support frame mounting holes 21 are provided, which cooperate with three support frames 8 to fix the push-pull disc 9, and the push-pull disc 9 is fixed to the base 7 through the support frames 8. A closed arc right-angle bent rod push-pull groove 22 is provided, as shown Figure 5 As shown, its width is greater than the diameter of the right-angled bend rod 10, and the center line of the right-angled bend rod push-pull groove 22 is the movement trajectory of the center of the right-angled bend rod cross section. The right-angled bend rod push-pull groove 22 passes through the push-pull disc 9, and a guide rail is set in the groove. Nine sleeves 23 are embedded in the guide rail. The outer wall of the sleeve 23 cooperates with the inner wall of the right-angled bend rod push-pull groove 22, and the inner wall of the sleeve 23 cooperates with the right-angled bend rod 10. For specific installation methods, please refer to Figure 6 The shape of the right-angled bending rod push-pull groove 22 is designed according to the actual motion trajectory of the axial piston pump plunger-shoe assembly. The Oxyz space rectangular coordinate system is established at the center of the swash plate. The z coordinate axis is coaxial with the axis of the integrated cylinder body-main shaft 13, the x coordinate axis is along the vertical diameter, and the y coordinate axis is along the horizontal radial direction. The cross-sectional center coordinates of the integrated plunger-shoe 15 are defined as (x O , y O , z O ), z O represents the motion trajectory of the integrated plunger-shoe 15 reciprocating along the axial direction, xO and y O Denote the motion trajectory of the integrated plunger-slipper 15 rotating along the circumferential direction, R denotes the distribution circle radius of the integrated plunger-slipper 15, β denotes the swash plate inclination angle, and the rotation angle of the integrated plunger-slipper 15 around z is defined as θ, then:

[0040] ;

[0041] Establish at the center of the push-pull disc 9 In the rectangular coordinate system, the coordinates of the center of the cross section of the right-angled bent rod relative to the center of the push-pull disk are defined as , is the projection of the right-angled bent rod 10 along the circumferential rotation trajectory of the integrated plunger-shoe 15 on the horizontal plane, is the projection of the axial reciprocating telescopic motion trajectory of the right-angled bent rod 10 along the integrated plunger-slipper 15 on the horizontal plane, then:

[0042] ;

[0043] Using fixed parameters R and β to define the coordinates of the center of the cross section of the right-angled bent rod relative to the center of the push-pull disk, we have:

[0044] ;

[0045] The center line of the right-angle bent rod push-pull groove 22 constrains the right-angle bent rod push-pull trajectory 20 as follows:

[0046] ;

[0047] When the drive motor 4 is activated, its output torque is transmitted to the integrated cylinder-main shaft 13 via the second coupling 3, torque sensor 2, and first coupling 1, driving the integrated cylinder-main shaft 13 in rotation. The nine integrated plunger-shoe assemblies, mounted in the nine cylinder bores 19 of the integrated cylinder bore-main shaft, rotate circumferentially around the axis of the integrated cylinder-main shaft 13 at the same speed, causing the right-angled rod 10, fixed to the integrated plunger-shoe 15, to also rotate circumferentially. Constrained by the right-angled rod push-pull slot 22 of the push-pull disk, the right-angled rod 10 simultaneously rotates circumferentially while also performing axial reciprocating telescopic motion along the right-angled rod push-pull trajectory 20 defined by the centerline of the right-angled rod push-pull slot 22. This, in turn, drives the integrated plunger-shoe 15 in axial reciprocating telescopic motion within the cylinder bore 19.

[0048] Based on the plunger pump stirring loss measuring device provided by the present invention with a reciprocating and telescopic plunger-shoe assembly, the testing method for the plunger pump stirring loss is as follows:

[0049] Step 1: The stirring zone 12 of the plunger pump stirring loss measurement device with a reciprocating piston-shoe assembly is filled with hydraulic oil, and the non-stirring zone is filled with oil to ensure lubrication. The drive motor 4 is started and the speed is set to 1000 rpm. When the output speed of the drive motor 4 stabilizes at 1000 rpm, the data acquisition card 5 is started with a sampling frequency of 10 Hz and a sampling time of 1 minute. A total of 600 voltage values ​​M representing the torque applied to the integrated cylinder-spindle 13 are collected. 湿 ={M 湿1 , M 湿2 , …, M 湿600}, the collected values ​​are uploaded to the host computer 6 for storage and then the drive motor 4 is turned off;

[0050] Step 2: Drain the hydraulic oil in the oil stirring area 12 and fill the non-oil stirring area with oil to ensure lubrication. Start the drive motor and set the speed to 1000 rpm. When the output speed of the drive motor 4 stabilizes at 1000 rpm, start the data acquisition card 5 with a sampling frequency of 10 Hz and a sampling time of 1 minute. A total of 600 voltage values ​​M representing the torque of the integrated cylinder-spindle 13 are collected. 干 ={M 干1 , M 干2 , …, M 干600}, the collected values ​​are uploaded to the host computer 6 for storage and then the drive motor 4 is turned off;

[0051] Step 3: Stirring loss of the plunger pump at 1000 rpm The calculation is as follows:

[0052] ;

[0053] Step 4: Change the output speed of the driving motor 4, repeat steps 1, 2, and 3, and obtain a stirring loss characteristic diagram of the plunger pump stirring loss-speed.

[0054] In order to remove the mechanical losses generated by the three major friction pairs of the plunger pump and avoid the "burning pump" phenomenon under the dry casing, the present invention removes the distribution plate, avoiding the influence of the mechanical losses generated by the friction of the distribution pair on the stirring loss measurement results; there is a 1 mm gap between the integrated plunger-slipper 15 and the inner wall of the cylinder hole 19, avoiding the influence of the mechanical losses generated by the friction of the plunger pair on the stirring loss measurement results; a 3 mm-5 mm gap is retained between the bottom end face of the slipper of the integrated plunger-slipper 15 and the end face of the inclined plate, avoiding the influence of the mechanical losses generated by the friction of the slipper pair on the stirring loss measurement results.

[0055] The device for measuring the stirring loss of a plunger pump with a reciprocating and telescopic plunger-slipper assembly provided by the present invention avoids the "burning pump" phenomenon of a dry casing by stripping off the mechanical loss generated by the friction pair of the rotating assembly, and fully considers the simulated working conditions of the reciprocating and telescopic motion of the plunger-slipper assembly, thereby realizing accurate measurement of the stirring loss of the plunger pump, thereby providing a reliable experimental test device for the analysis of the stirring loss characteristics and the study of energy consumption distribution of the plunger pump.

[0056] The above description is only a specific embodiment of the present invention. Those skilled in the art may adjust the parameters or structures according to actual needs, but these adjustments should fall within the scope of protection of the present invention.

Claims

1. A device for measuring stirring loss of a plunger pump with a reciprocating and telescopic plunger-shoe assembly, characterized in that: The device includes a reciprocating conversion module and a stirring loss measurement module; The reciprocating conversion module is used to realize the reciprocating telescopic motion of the integrated plunger-slipper assembly, and includes a right-angle bent rod, a push-pull disc, a support frame and a base; The push-pull disc is provided with a support frame mounting hole and a right-angle bent rod push-pull groove, the support frame mounting hole cooperates with the support frame, and the support frame and the base are fixedly connected; the right-angle bent rod push-pull groove passes through the push-pull disc, a guide rail is provided in the right-angle bent rod push-pull groove, the guide rail in the right-angle bent rod push-pull groove is embedded in a sleeve, the inner wall of the right-angle bent rod push-pull groove cooperates with the outer wall of the sleeve, and the right-angle bent rod cooperates with the inner wall of the sleeve; the shape of the right-angle bent rod push-pull groove is designed according to the actual motion trajectory of the axial piston pump plunger-shoe assembly; The stirring loss measurement module is used to measure, calculate, record and display the stirring loss of the plunger pump, and includes an integrated cylinder-spindle, an integrated plunger-shoe, a swash plate, a housing, a torque sensor, a drive motor and a data acquisition card; The integrated cylinder body-spindle has cylinder holes evenly distributed along the circumference of the cylinder body for installing the integrated plunger-slipper; right-angle bent rod through holes are evenly distributed along the circumference of the bottom end surface of the cylinder body and cooperate with the right-angle bent rod; the plunger part of the integrated plunger-slipper is provided with an axial countersunk hole, and the right-angle bent rod is fixedly inserted into the countersunk hole; the shell cooperates with the swash plate near the drive motor end, and the shell cooperates with the integrated cylinder body-spindle away from the drive motor end; a skeleton oil seal is installed between the shell and the integrated cylinder body-spindle; the integrated cylinder body-spindle passes through the swash plate and is connected to the output end of the drive motor through the torque sensor; the enclosed area formed by the shell, the integrated cylinder body-spindle, the integrated plunger-slipper, the swash plate and the skeleton oil seal is the oil stirring area of ​​the stirring loss measurement module; the data acquisition card collects the voltage signal of the torque sensor and calculates the stirring loss when the oil stirring area is filled with hydraulic oil and when the hydraulic oil is exhausted.

2. The device for measuring stirring loss of a plunger pump with a reciprocating and telescopic plunger-shoe assembly according to claim 1, characterized in that: Establish a coordinate system at the center of the push-pull disc The push-pull groove of the right-angle bent rod constrains the push-pull trajectory of the right-angle bent rod to the following relationship: ； in, represents the position coordinates of the center of the cross section of the right-angled bent rod relative to the center of the push-pull disc, It reflects the projection of the right-angled bent rod on the horizontal plane along the circumferential rotation trajectory of the integrated plunger-shoe. It reflects the projection of the right-angle bent rod along the axial reciprocating telescopic motion trajectory of the integrated plunger-slipper on the horizontal plane, β represents the inclination angle of the swash plate, and R represents the distribution circle radius of the integrated plunger-slipper.

3. The device for measuring stirring loss of a plunger pump with a reciprocating and telescopic plunger-shoe assembly according to claim 1, characterized in that: The right-angle bent rod includes a horizontal section and a vertical section. The horizontal section of the right-angle bent rod cooperates with the integrated cylinder body-main shaft, and the vertical section of the right-angle bent rod cooperates with the sleeve in the right-angle bent rod push-pull groove of the push-pull disc.

4. The device for measuring stirring loss of a plunger pump with a reciprocating and telescopic plunger-shoe assembly according to claim 1, characterized in that: The depth of the cylinder hole of the integrated cylinder block-spindle is greater than the length of the integrated plunger-shoe, but the cylinder hole does not penetrate the integrated cylinder block-spindle.

5. The device for measuring stirring loss of a plunger pump with a reciprocating and telescopic plunger-shoe assembly according to claim 1, characterized in that: The axis of the cylinder hole is located on the distribution circle of the integrated plunger-slipper.

6. The device for measuring stirring loss of a plunger pump with a reciprocating and telescopic plunger-shoe assembly according to claim 1, characterized in that: An O-type sealing ring is installed between the through hole of the right-angle bent rod and the right-angle bent rod.

7. The device for measuring stirring loss of a plunger pump with a reciprocating and telescopic plunger-shoe assembly according to claim 1, characterized in that: The voltage signal of the torque sensor is collected by the data acquisition card when the churning area is filled with hydraulic oil and when the hydraulic oil is exhausted, and the churning loss of the plunger pump is calculated.

8. The device for measuring stirring loss of a plunger pump with a reciprocating and telescopic plunger-shoe assembly according to claim 1, characterized in that: A gap of 3 mm to 5 mm is provided between the bottom end surface of the integrated plunger-shoe and the end surface of the swash plate.

9. The device for measuring stirring loss of a plunger pump with a reciprocating and telescopic plunger-shoe assembly according to claim 1, characterized in that: A gap of 1 mm is provided between the plunger surface of the integrated plunger-slipper and the inner wall of the cylinder bore.

10. A method for measuring the stirring loss of a plunger pump based on the device for measuring the stirring loss of a plunger pump with a reciprocating and telescopic plunger-shoe assembly according to any one of claims 1 to 9, characterized in that: The method comprises the following steps: Step 1: Fill the churning area of ​​the plunger pump churning loss measurement device with hydraulic oil, and fill the non-churning area with oil to ensure lubrication; start the drive motor and set the speed. After the output speed stabilizes, start the data acquisition card to collect multiple sets of voltage values ​​representing the torque of the integrated cylinder-spindle, upload them to the host computer, save them, and then turn off the drive motor; Step 2: Drain the hydraulic oil in the oil stirring area and fill the non-oil stirring area with oil to ensure lubrication; start the drive motor and set the same speed as in step 1; when the output speed stabilizes, start the data acquisition card, collect the same number of voltage values ​​representing the torque of the integrated cylinder-spindle as in step 1, upload them to the host computer, save them, and then turn off the drive motor; Step 3: Take the mean of the multiple voltage values ​​in step 1 and step 2 and make the difference to obtain the stirring loss of the plunger pump at the speed set in step 1; Step 4: Change the output speed of the driving motor set in step 1, repeat steps 1 to 3, and obtain a stirring loss characteristic diagram of the piston pump stirring loss-speed.

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