An ultrahigh pressure reciprocating water hydraulic seal comprehensive experiment table and a friction force measuring method

Abstract

The application discloses a kind of ultra-high pressure reciprocating water hydraulic seal comprehensive test bench and friction measurement method, belong to rubber reciprocating seal technical field.Test bench mainly includes driving mechanism, stress sensor, plunger, eccentric shaft, experimental valve block and hydraulic power source, driving mechanism controls plunger reciprocating motion in experimental valve block, stress sensor gathers the resistance signal of plunger movement, eccentric shaft can be adjusted eccentricity by adjusting screw on experimental valve block;Experimental valve block mainly includes main valve body, auxiliary valve body, end cover, valve sleeve, test seal and the like, main valve body is equipped with flow passage and pressure input port, test seal is installed on valve sleeve.The application can measure the inner and outer stroke friction of single seal, the friction of double-side pressure seal, the leakage rate of plunger rod double-side pressure reciprocating seal under different eccentricity and the leakage rate of ultra-high pressure gap seal, and provide experimental basis for the comprehensive performance research of reciprocating water hydraulic seal.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of rubber reciprocating sealing, and more particularly relates to an ultrahigh-pressure reciprocating water hydraulic sealing comprehensive experiment table and a friction force measuring method. BACKGROUND

[0002] Deep-sea equipment is the foundation for realizing the exploration, development and utilization of marine resources, is the key technical equipment for maintaining the country's marine rights and interests and the integrity of the marine territory, and is a major deployment for realizing the strategy of China's marine power. The full-sea water intrusion, corrosion and ultrahigh-pressure environment of the deep sea bring great challenges to the development of deep-sea equipment. Reciprocating sealing technology plays a key role in isolating the external seawater environment and the internal working environment of the system, and is a key basic technology for ensuring the normal operation and reliable operation of deep-sea equipment.

[0003] Reciprocating sealing technology involves multiple disciplines such as machinery, materials, friction and lubrication, and it is difficult to evaluate the performance of reciprocating sealing only by establishing a mathematical model, and it needs to be verified by experimental research. The ultrahigh-pressure sealing environment causes severe deformation of the rubber sealing element, and it is difficult to form a water lubrication film for reciprocating water hydraulic sealing, and the interface sealing mechanism is complex, and the friction, wear and life of reciprocating sealing are more difficult to quantify. The water lubrication environment of deep-sea ultrahigh pressure is extremely complex, and there is little related reciprocating sealing theory and experimental research, and at present, the existing reciprocating sealing experimental test equipment cannot meet the requirements of deep-sea ultrahigh pressure and water lubrication characteristics.

[0004] Therefore, in view of the major needs of deep-sea equipment, the breakthrough of ultrahigh-pressure reciprocating water hydraulic sealing technology and the need for experimental research on the performance of reciprocating sealing, there is an urgent need in the art to design a comprehensive experiment table for reciprocating water hydraulic sealing performance test matching full-sea depth pressure working condition. SUMMARY

[0005] In view of the fact that the existing technology cannot meet the needs of ultrahigh-pressure, water-lubricated reciprocating sealing performance test, the application provides an ultrahigh-pressure reciprocating water hydraulic sealing comprehensive experiment table and a friction force measuring method, which matches the full-sea depth pressure sealing working condition, can measure the inner and outer stroke friction forces of a single sealing ring, the reciprocating friction force of a double-sided pressure sealing ring, the leakage rate of a plunger rod double-sided pressure reciprocating sealing element under different eccentricities, and simultaneously has the functions of measuring the wear and life of the reciprocating sealing element and the leakage rate of the ultrahigh-pressure gap sealing.

[0006] To achieve the above-mentioned purpose, in a first aspect, the application provides an ultrahigh-pressure reciprocating water hydraulic sealing comprehensive experiment table, comprising a driving mechanism, a stress sensor, a plunger and an experimental valve block, wherein:

[0007] The experimental valve block comprises a main valve body, a first pressure port, a first valve sleeve, a second pressure port, a second valve sleeve, a separation gasket and a plunger sleeve;

[0008] The first pressure port and the second pressure port are machined on the main valve body, and the flow channel of the first pressure port corresponds to the flow channel inside the isolation gasket, and the flow channel of the second pressure port penetrates to the second valve sleeve;

[0009] The first valve sleeve, the isolation gasket, and the second valve sleeve are sequentially loaded into the main valve body from top to bottom and are compressed; the first valve sleeve and the second valve sleeve are provided with grooves at the ends in contact with the isolation gasket, and the two grooves are respectively used for embedding the first test sealing element and the second test sealing element; the other end of the second valve sleeve is in contact with one end of the plunger sleeve;

[0010] The plunger penetrates the first valve sleeve, the isolation gasket, the second valve sleeve, and the plunger sleeve;

[0011] The driving mechanism is used for controlling the reciprocating motion of the plunger in the experimental valve block; and the stress sensor is used for collecting the resistance signal of the plunger motion.

[0012] Further, the experimental bench further comprises a joint bearing ball head and a joint bearing end head connected through a spherical hinge, the joint bearing ball head is connected to the driving mechanism, and the joint bearing end head is connected to the stress sensor.

[0013] Further, the experimental bench further comprises a floating connection screw and a floating connection nut, the floating connection screw is connected to the stress sensor, and the floating connection screw and the floating connection nut are connected to form an internal cavity for connecting with the plunger.

[0014] Further, the experimental valve block further comprises an auxiliary valve body, a dial gauge, an eccentric shaft, and an adjusting screw.

[0015] The auxiliary valve body is in contact with the other end of the plunger sleeve; the eccentric shaft is installed at the bottom of the plunger, and the eccentric shaft penetrates the auxiliary valve body.

[0016] The adjusting screw and the dial gauge are located on both sides of the eccentric shaft, and are connected with the auxiliary valve body and in contact with the eccentric shaft, and the eccentric amount of the plunger is adjusted by changing the screwing length of the adjusting screw according to the dial gauge reading.

[0017] Further, the plunger and the plunger sleeve are in clearance fit, the first valve sleeve, the second valve sleeve, and the main valve body are in clearance fit, and the plunger sleeve and the auxiliary valve body are in clearance fit.

[0018] Further, the first valve sleeve and the second valve sleeve are machined with a cross-shaped rectangular groove at the ends not in contact with the isolation gasket to form a flow channel.

[0019] Further, a cross flow channel is processed inside the isolation gasket, so that the outer ring surface and the inner ring surface of the isolation gasket are communicated, and the cross flow channel corresponds to the flow channel of the first pressure port.

[0020] Further, the experiment table further comprises a seawater pump connected with the first pressure port or the second pressure port, for providing high-pressure seawater.

[0021] In the second aspect, the application provides a sealing reciprocating friction force measuring method based on the ultra-high pressure reciprocating water hydraulic sealing comprehensive experiment table of the first aspect, and the method comprises:

[0022] The first test sealing piece is installed in the experiment valve block, high-pressure seawater is provided to the second pressure port, the first pressure port is closed, the plunger is driven to reciprocate at a set speed, displacement and time parameter, and the friction force measured by the stress sensor is the friction force of the sealing piece under unilateral pressure.

[0023] Further, the method further comprises:

[0024] The first test sealing piece and the second test sealing piece are installed in the experiment valve block, high-pressure seawater is provided to the first pressure port and the second pressure port, the plunger is driven to reciprocate at the set speed, displacement and time parameter, the friction force is measured by the stress sensor, and the measured friction force is subtracted from the friction force of the sealing piece under unilateral pressure under the same parameter, so as to obtain the friction force of the sealing piece under bilateral pressure.

[0025] Overall, the above technical solutions conceived by the application can achieve the following beneficial effects:

[0026] 1. For the working environment of ultra-high pressure and reciprocating water hydraulic sealing, the application of the plunger and the plunger sleeve precision gap sealing mode is innovatively proposed to realize the sealing of the internal pressure of the system, which avoids adding additional sealing ring to measure the reciprocating friction force, and the viscosity of water is very low, so that the axial resistance of the gap sealing to the friction force measurement is very small, and the contrast test friction force can be completely ignored.

[0027] 2. For the problem that the radial force of the plunger reciprocating in the experiment valve block will cause additional friction resistance, the application innovatively proposes a floating connection and gap control method, which realizes the self-centering gap cooperation between the plunger and the plunger sleeve, so that the radial force of the plunger during actual movement is only the radial holding force of the test sealing piece.

[0028] 3. The reciprocating seal test bench provided by the present application can simultaneously connect the first pressure port and the second pressure port of the valve body with the outlet of the seawater pump, adjust the eccentricity of the plunger by changing the length of the adjusting screw screwed in through the reading of the dial gauge, and then measure the leakage rate of the reciprocating seal under different eccentricity of the plunger rod.

[0029] 4. The reciprocating seal test bench provided by the present application can connect the second pressure port of the valve block with the outlet of the seawater pump, install only the first test seal and seal the first pressure port with the screw plug, adjust the pressure through the overflow valve of the hydraulic system, and drive the electric cylinder through the industrial computer to make the plunger reciprocate at the set speed, displacement and time parameters to measure the reciprocating friction of the single-side pressure seal, and at the same time, measure the wear and service life of the single-side pressure reciprocating seal.

[0030] 5. The reciprocating seal test bench provided by the present application can simultaneously connect the first pressure port and the second pressure port with the outlet of the seawater pump, install the first test seal and the second test seal, adjust the pressure through the overflow valve of the hydraulic system, drive the electric cylinder to make the plunger reciprocate, and subtract the resistance value measured in the single-side pressure test to obtain the reciprocating sealing friction of the double-side pressure seal.

[0031] 6. The reciprocating seal test bench provided by the present application designs the annular boss and through hole on the auxiliary valve body, adjusts the length of the sealing area of the ultra-high pressure gap seal by controlling the relative position of the plunger in the plunger sleeve, records the leakage amount through the plunger sleeve at the auxiliary valve body, and measures the leakage amount of the plunger and the plunger sleeve in the ultra-high pressure gap seal.

[0032] 7. The reciprocating seal test bench provided by the present application can control the size and sealing gap of the test seal only by modifying the size of the annular groove and the size of the inner hole of the valve sleeve, and has the advantages of multifunction and modular test. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 It is a test principle diagram of the reciprocating seal under different eccentricity of the plunger rod double-side pressure provided by the present application.

[0034] Figure 2 It is a test principle diagram of the single-side pressure reciprocating seal friction provided by the present application.

[0035] Figure 3 It is a test principle diagram of the double-side pressure reciprocating seal friction provided by the present application.

[0036] Figure 4 It is a whole diagram of the test bench provided by the present application.

[0037] Figure 5 It is a structure diagram of the test measurement device provided by the present application.

[0038] The same reference signs are used throughout the drawings to represent the same elements or structures, wherein:

[0039] 100-driving mechanism, 101-electric cylinder, 102-industrial computer all-in-one, 103-driver module, 104-power controller module; 200-sensor installation connecting mechanism, 201-driving positioning plate, 202-electric cylinder joint, 203-knuckle bearing ball head, 204-knuckle bearing end, 205-stress sensor, 206-hexagonal thin nut, 207-floating connection screw, 208-floating connection nut, 209-plunger; 210-valve block positioning flange, 211-flange positioning plate, 212-positioning light rod; 300-experimental valve block integrated mechanism, 301-second pressure port, 302-accumulator, 303-pressure gauge, 304-seawater pump, 305-motor, 306-overflow valve, 307-water tank, 308-filter, 309-Ha quantity micrometer, 310-secondary valve body, 311-unbalanced shaft, 312-adjusting screw, 313-valve body connecting screw, 314-plunger sleeve, 315-fixed end cover, 316-main valve body, 317-sealing sleeve, 318-radial sealing element, 319-second valve sleeve, 320-second test sealing element, 321-isolation gasket, 322-first pressure port, 323-screw boss, 324-first test sealing element, 325-first valve sleeve; 400-aluminum alloy profile base, 401-base caster, 402-base footing assembly. DETAILED DESCRIPTION

[0040] In order to make the objects, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and should not be used to limit the present application. In addition, the technical features involved in each embodiment of the present application described below can be combined with each other as long as they do not conflict with each other.

[0041] In the present application, the terms "first", "second", etc. (if any) in the present application and the drawings are used to distinguish similar objects, and do not necessarily describe a specific order or sequence.

[0042] Reference Figure 1 , in combination Figures 2 to 5 The present application provides a kind of superhigh pressure reciprocating water hydraulic seal comprehensive experiment table, and experimental table whole body includes driving mechanism 100, sensor installation connecting mechanism 200, experimental valve block integrated mechanism 300, aluminum alloy profile base 400.

[0043] Driving mechanism 100 includes electric cylinder 101, industrial computer all-in-one 102, driver module 103, power controller module 104.

[0044] The electric cylinder 101 is installed on the driving positioning plate 201 through screw centering, and is connected with the driver module 103 and the power controller module 104, the driving positioning plate 201 is installed on the aluminum alloy profile base 400 together with the industrial personal computer 102, the industrial personal computer 102 controls the reciprocating motion of the electric cylinder 101, the electric cylinder joint 202 is connected with the joint bearing ball head 203, the joint bearing ball head 203 is connected with the joint bearing end head 204 through a ball hinge, and the stress sensor 205 is rigidly connected with the joint bearing end head 204 through a nut.

[0045] In addition, the electric cylinder 101 controls the reciprocating motion of the plunger 209 in the experimental valve block, the stress sensor 205 is rigidly connected with the floating connection screw 207 through the hexagonal thin nut 206, the floating connection screw 207 is threadedly connected with the floating connection nut 208, and an internal cavity formed thereby is used for connecting with the plunger 209.

[0046] The sensor mounting and connecting mechanism 200 comprises a driving positioning plate 201, an electric cylinder joint 202, a joint bearing ball head 203, a joint bearing end head 204, a stress sensor 205, a hexagonal thin nut 206, a floating connection screw 207, a floating connection nut 208, a plunger 209, a valve block positioning flange 210, a flange positioning plate 211 and a positioning light rod 212.

[0047] The stress sensor 205 is used for collecting the motion resistance of the plunger 209 in the experimental valve block and uploading to the industrial personal computer 102. Preferably, the floating connection nut 208 is internally machined with a stepped surface, so as to limit the screwed-in position of the floating connection nut 208, the internal cavity formed by the floating connection screw 207 and the floating connection nut 208 is slightly larger than the size of the end portion of the plunger 209, the plunger 209 can move axially and radially in the cavity, and a floating connection is formed, so that there is no additional radial force when the plunger 209 is driven to reciprocate.

[0048] The experimental valve block is connected and centered with the flange positioning plate 211 through the valve block positioning flange 210, the flange positioning plate 211 is centered with the driving positioning plate 201 through four positioning light rods 212, so as to ensure that the experimental valve block, the electric cylinder 101 and the stress sensor 205 are coaxial.

[0049] The experimental valve block integration mechanism 300 comprises an experimental valve block and a hydraulic power source.

[0050] The experimental valve block comprises a main valve body 316, an auxiliary valve body 310, a fixed end cover 315, a dial indicator 309, a biasing shaft 311, an adjusting screw 312, a valve body connecting screw 313, a first valve sleeve 325, a second valve sleeve 319, a spacer gasket 321, a sealing sleeve 317, a plunger sleeve 314, a radial seal 318, a first test seal 324 and a second test seal 320. The first test seal 324 is installed in the first valve sleeve 325, and the second test seal 320 is installed in the second valve sleeve 319. The first valve sleeve 325, the spacer gasket 321, the second valve sleeve 319 and the sealing sleeve 317 are sequentially installed in the main valve body 316 and are compressed by the fixed end cover 315. The plunger sleeve 314 is in transition fit with the sealing sleeve 317, and the radial seal 318 is used to ensure the static seal at the position. One end of the plunger sleeve 314 abuts against the second valve sleeve 319, and the other end abuts against the auxiliary valve body 310. The three are compressed by the valve body connecting screw 313.

[0051] The first pressure port 322 and the second pressure port 301 are machined on the main valve body 316. The flow channel of the first pressure port 322 is communicated with the outer annular surface of the spacer gasket 321. The pressure is introduced into the inner annular surface of the spacer gasket 321 through the internal flow channel of the spacer gasket 321, so as to ensure that the first test seal 324 and the second test seal 320 are subjected to single-side pressure. The flow channel of the second pressure port 301 is communicated with the end surface of the second valve sleeve 319. The pressure is introduced into the inner annular surface of the second valve sleeve 319 through the cross-shaped rectangular groove machined on the end surface of the second valve sleeve, so as to ensure that the second test seal 320 is subjected to double-side pressure.

[0052] The biasing shaft 311 is installed at the bottom of the plunger 209 through threads, so that the eccentricity of the biasing shaft 311 can be adjusted. The adjusting screw 312 and the dial indicator 309 are connected with the auxiliary valve body 310 through preset threaded holes and are in contact with the biasing shaft 311. The length of the adjusting screw 312 is changed by reading the dial indicator 309, so as to adjust the eccentricity of the plunger 209. Then, the leakage rate of the double-side pressure reciprocating seal of the plunger rod under different eccentricities is measured.

[0053] Preferably, the plunger 209 is in clearance fit with the plunger sleeve 314, the plunger sleeve 314 is in transition fit with the sealing sleeve 317, the first valve sleeve 325, the second valve sleeve 319, the sealing sleeve 317 and the main valve body 316 are all in clearance fit, the plunger sleeve 314 is in clearance fit with the auxiliary valve body 310, and the inner holes of the first valve sleeve 325, the second valve sleeve 319 and the plunger sleeve 314 are all slightly larger than the diameter of the plunger 209.

[0054] Preferably, the diameters of the inner holes of the first valve sleeve 325 and the second valve sleeve 319 can be machined and modified according to the requirements of the sealing gap. The sizes of the annular grooves in which the test seals are embedded in the first valve sleeve 325 and the second valve sleeve 319 can be modified according to the sizes of the actual test seals.

[0055] Preferably, the first valve sleeve 325 and the second valve sleeve 319 are machined with cross-shaped rectangular grooves at the ends not in contact with the isolation gasket 321, forming flow channels.

[0056] Preferably, the isolation gasket 321 is machined with cross-shaped flow channels inside, so that the outer and inner annular surfaces of the isolation gasket 321 are communicated, and the cross-shaped flow channels correspond to the flow channels of the first pressure port 322.

[0057] Preferably, the main valve body 316 is machined with a step inside for positioning the sealing sleeve 317, and a small step is machined above the step, and the flow channel of the second pressure port 301 penetrates to the small step.

[0058] Preferably, the radial seals 318 are all static seals, used to isolate the internal pressure of the system.

[0059] Preferably, the first test seal 324 and the second test seal 320 can be various shapes of reciprocating seals.

[0060] The hydraulic power source includes a seawater pump 304, a water tank 307, a filter 308, a pressure gauge 303, a relief valve 306, and an accumulator 302. The seawater pump 304 is a super-high pressure seawater pump, the outlet of which can be connected to the first pressure port 322 or the second pressure port 301 to provide high pressure seawater. The relief valve 306 is used to adjust the sealing pressure provided by the system, and the accumulator 302 ensures the stability of the system pressure.

[0061] The aluminum alloy profile base 400 includes base casters 401 and base footing assemblies 402.

[0062] Please refer to Figure 1 To measure the leakage rate of the double-sided pressure reciprocating seal of the plunger rod under different eccentricities, the eccentric load shaft 311 is installed at the bottom of the plunger 209 through threads, the adjusting screw 312 and the dial indicator 309 are installed in the pre-threaded hole of the auxiliary valve body 310 and are in contact with the eccentric load shaft 311, the first test seal 324 and the second test seal 320 are installed in the experimental valve block, the outlet of the seawater pump 304 is connected to the first pressure port 322 and the second pressure port 301, the hydraulic system is pressure-adjusted through the relief valve 306, the dial indicator 309 reading is changed by adjusting the length of the adjusting screw 312 screwed in, thereby adjusting the eccentricity of the plunger 209, and then measuring the leakage rate of the double-sided pressure reciprocating seal of the plunger rod under different eccentricities.

[0063] Please refer to Figure 2For measuring reciprocating sealing friction of the seal under one-side pressure, only the first test seal 324 is installed in the experimental valve block, the seawater pump 304 outlet is connected to the second pressure port 301 of the valve block, the first pressure port 322 is sealed by the screw plug 323, the hydraulic system is pressure-regulated by the overflow valve 306, the plunger 209 is reciprocated at a set speed, displacement and time parameter by the industrial computer 102 driven electric cylinder 101, and the friction of the seal under one-side pressure is obtained, and the wear and life of the reciprocating seal under one-side pressure can be measured.

[0064] Please refer to Figure 3 For measuring reciprocating sealing friction of the seal under two-side pressure, the first test seal 324 and the second test seal 320 are installed in the experimental valve block, the seawater pump 304 outlet is connected to the first pressure port 322 and the second pressure port 301, the hydraulic system is pressure-regulated by the overflow valve 306, the plunger 209 is reciprocated at a set speed, displacement and time parameter by the industrial computer 102 driven electric cylinder 101, and the reciprocating sealing friction of the seal under two-side pressure is obtained by subtracting the resistance value of the one-side pressure test.

[0065] In addition, refer to Figure 2 The installation mode, the auxiliary valve body 310 is processed with an annular boss, and a through hole is processed on the boss, the relative position of the plunger 209 in the plunger sleeve 314 is controlled, the length of the sealing area of the ultra-high pressure gap seal is adjusted, and the leakage amount of the auxiliary valve body 310 through the plunger sleeve 314 is recorded, and the leakage amount of the plunger and the plunger sleeve ultra-high pressure gap seal is obtained.

[0066] Those skilled in the art can easily understand that the above description is only a preferred embodiment of the present application, and is not used to limit the present application, and any modification, equivalent replacement and improvement within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. An ultra-high pressure reciprocating water hydraulic seal comprehensive experiment table, characterized in that, It comprises a driving mechanism (100), a stress sensor (205), a plunger (209) and an experimental valve block, wherein: The experimental valve block comprises a main valve body (316), a first pressure port (322), a first valve sleeve (325), a second pressure port (301), a second valve sleeve (319), an isolation gasket (321) and a plunger sleeve (314); The first pressure port (322) and the second pressure port (301) are machined on the main valve body (316), and the flow channel of the first pressure port (322) corresponds to the flow channel inside the isolation gasket (321), and the flow channel of the second pressure port (301) penetrates to the second valve sleeve (319); The first valve sleeve (325), the isolation gasket (321) and the second valve sleeve (319) are sequentially loaded into the main valve body (316) from top to bottom and are compressed tightly; the end of the first valve sleeve (325) and the second valve sleeve (319) in contact with the isolation gasket (321) is provided with a groove, and the two grooves are respectively used for embedding the first test sealing element (324) and the second test sealing element (320); the other end of the second valve sleeve (319) is in contact with one end of the plunger sleeve (314); The plunger (209) penetrates through the first valve sleeve (325), the isolation gasket (321), the second valve sleeve (319) and the plunger sleeve (314); The driving mechanism (100) is used for controlling the reciprocating movement of the plunger (209) in the experimental valve block; the stress sensor (205) is used for collecting the resistance signal of the plunger (209) movement; The experimental valve block further comprises an auxiliary valve body (310), a dial indicator (309), a biasing shaft (311) and an adjusting screw (312); The auxiliary valve body (310) is in contact with the other end of the plunger sleeve (314); the biasing shaft (311) is installed at the bottom of the plunger (209), and the biasing shaft (311) penetrates through the auxiliary valve body (310); The adjusting screw (312) and the dial indicator (309) are located on both sides of the biasing shaft (311), and are connected with the auxiliary valve body (310) and in contact with the biasing shaft (311); the dial indicator (309) reading is changed to adjust the length of the adjusting screw (312) screwed in, so as to adjust the eccentricity of the plunger (209); It further comprises a seawater pump (304) connected with the first pressure port (322) or the second pressure port (301), which is used for providing high-pressure seawater.

2. The super-high pressure reciprocating water hydraulic seal comprehensive experiment table according to claim 1, characterized in that, It further comprises: A joint bearing ball head (203) and a joint bearing end head (204) connected by a spherical hinge, the joint bearing ball head (203) is connected with the driving mechanism (100), and the joint bearing end head (204) is connected with the stress sensor (205).

3. The super-high pressure reciprocating water hydraulic seal comprehensive experiment table according to claim 1, characterized in that, It further comprises: A floating connection screw (207) and a floating connection nut (208), the floating connection screw (207) is connected with the stress sensor (205); the floating connection screw (207) and the floating connection nut (208) are connected to form an internal cavity for connecting with the plunger (209).

4. The super-high pressure reciprocating water hydraulic seal comprehensive experiment table according to claim 1, characterized in that, The plunger (209) and the plunger sleeve (314) are clearance fit, the first valve sleeve (325), the second valve sleeve (319) and the main valve body (316) are clearance fit, the plunger sleeve (314) and the auxiliary valve body (310) are clearance fit.

5. The super-high pressure reciprocating water hydraulic seal comprehensive experiment table according to claim 1, characterized in that, The first valve sleeve (325) and the second valve sleeve (319) are not in contact with the isolation gasket (321) and are provided with cross rectangular grooves at one end, forming flow channels.

6. The super-high pressure reciprocating water hydraulic seal comprehensive experiment table according to claim 1, characterized in that, The isolation gasket (321) is internally provided with cross flow channels, so that the outer and inner annular surfaces of the isolation gasket (321) are communicated, and the cross flow channels correspond to the flow channels of the first pressure port (322).

7. A method for measuring the reciprocating sealing friction of a seal based on the ultra-high pressure reciprocating water hydraulic seal comprehensive test bench according to any one of claims 1 to 6, characterized in that, The method comprises: The first test seal (324) is installed in the experimental valve block, high-pressure seawater is provided to the second pressure port (301), and the first pressure port (322) is sealed, the plunger (209) is reciprocated at a set speed, displacement and time parameter by the driving mechanism (100), and the friction force measured by the stress sensor (205) is the friction force of the single-side pressure of the seal.

8. The method of claim 7, wherein, The method further comprises: The first test seal (324) and the second test seal (320) are installed in the experimental valve block, high-pressure seawater is provided to the first pressure port (322) and the second pressure port (301), the plunger (209) is reciprocated at the set speed, displacement and time parameter by the driving mechanism (100), the friction force measured by the stress sensor (205) is subtracted by the friction force of the single-side pressure of the seal under the same parameter, and the friction force of the double-side pressure of the seal is obtained.

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