High and low temperature fatigue pressurization test system for vehicle hydrogen cylinder

Abstract

The utility model discloses a high and low temperature fatigue pressurization test system for a vehicle hydrogen cylinder, and the system comprises a double-acting supercharger which is connected with the vehicle hydrogen cylinder and is used for pressurizing a test medium and then conveying the test medium to the vehicle hydrogen cylinder; the medium filling and exhausting device is used for conveying the test medium to the double-acting supercharger and exhausting the vehicle hydrogen cylinder; the servo hydraulic device is used for conveying hydraulic oil to the double-acting supercharger, and the hydraulic oil pushes the double-acting supercharger to move so as to pressurize the test medium; and the control device is used for controlling control elements of the medium filling exhaust device and the servo hydraulic device to work. Compared with the prior art in which an electric pump is adopted to pressurize the vehicle hydrogen cylinder, the testing system has the advantages that the problems that the types of testing media are limited and the temperature of the testing media is inconvenient to increase and decrease are solved, and the testing of the vehicle hydrogen cylinders with all sizes can be met.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicle hydrogen cylinders, in particular to a high and low temperature fatigue pressurization test system for vehicle hydrogen cylinders. Background Technique

[0002] During the existing high and low temperature fatigue pressurization test of vehicle hydrogen cylinders (Type IV), the detection method is to pressurize the normal temperature test medium through an electric pump, and the pressurization rate is adjusted through a frequency conversion motor and a frequency converter.

[0003] The above test method has the following disadvantages:

[0004] The selection of the test medium type is restricted. When the temperature of the test medium is too low, the electric pump cannot suck in some types of low temperature test media; when the temperature of the test medium is too high, some types of high temperature test media will affect the performance of the sealing ring of the electric pump. Therefore, only some test media can be selected in the existing method.

[0005] It is not convenient to heat and cool the test medium.

[0006] The method of using a frequency converter to boost the pressure of the test medium has relatively high requirements for the volume of the vehicle hydrogen cylinder and cannot cover the test requirements of most vehicle hydrogen cylinders. Content of the Utility Model

[0007] The utility model aims to solve at least one of the technical problems in the related technologies to some extent. For this reason, an object of the utility model is to provide a high and low temperature fatigue pressurization test system for vehicle hydrogen cylinders to facilitate the high and low temperature fatigue pressurization test of vehicle hydrogen cylinders (Type IV).

[0008] The technical solution adopted by the utility model is as follows:

[0009] In the first aspect, the utility model provides a high and low temperature fatigue pressurization test system for vehicle hydrogen cylinders, and the experimental system includes: a double-acting supercharger connected to the vehicle hydrogen cylinder for delivering the pressurized test medium to the vehicle hydrogen cylinder; a medium filling and exhaust device for delivering the test medium to the double-acting supercharger and exhausting the vehicle hydrogen cylinder; a servo hydraulic device for delivering hydraulic oil to the double-acting supercharger, and the hydraulic oil pushes the double-acting supercharger to move to pressurize the test medium; a control device for controlling the control elements of the medium filling and exhaust device and the servo hydraulic device to work.

[0010] Among them, the double-acting supercharger includes: an oil cylinder connected to the servo hydraulic device, through which the hydraulic oil is transported to the oil cylinder by the servo hydraulic device and then returns to the servo hydraulic device; a medium cylinder including a first medium cylinder and a second medium cylinder, which are respectively arranged on both sides of the oil cylinder and communicated with the oil cylinder, and the test medium is transported to the first medium cylinder or the second medium cylinder by the medium filling and exhaust device; a first piston arranged in the oil cylinder, which divides the oil cylinder into a left oil cylinder and a right oil cylinder, and the first piston reciprocates left and right in the oil cylinder; a second piston arranged in the first medium cylinder; a third piston arranged in the second medium cylinder, the second piston is connected to one end of the first piston, and the third piston is connected to the other end of the first piston. When the first piston reciprocates, it drives the second piston and the third piston to reciprocate, so as to pressurize the test medium in the first medium cylinder or the second medium cylinder; four one-way valves, through which the test medium flows into or out of the medium cylinder; two proximity switches respectively arranged on the left and right sides of the oil cylinder for sensing the displacement of the first piston to the left or right; a medium input pipeline connected to the medium filling and exhaust device for transporting the test medium to the medium cylinder; a medium output pipeline connected to the vehicle hydrogen cylinder for transporting the test medium to the vehicle hydrogen cylinder.

[0011] Among them, the cross-sectional area of the working surface pushed by the first piston is larger than that of the second piston or the third piston.

[0012] Among them, the medium filling and exhaust device includes: a high and low temperature medium tank for heating or refrigerating the test medium; a medium tank for storing the test medium from the high and low temperature medium tank; a centrifugal pump connected to the medium input pipeline for pressurizing the test medium and transporting it to the double-acting supercharger; a first motor for providing power to the centrifugal pump; a first oil suction filter arranged between the centrifugal pump and the medium tank for ensuring the cleanliness of the test medium entering the centrifugal pump; a first ball valve arranged between the first oil suction filter and the medium tank for isolating the medium tank from the first oil suction filter and facilitating the cleaning of the filter element of the first oil suction filter.

[0013] Among them, the medium filling and exhaust device further includes: a pneumatic control valve, one end of which is connected to the medium output pipeline and the other end is connected to the medium tank, which is used for exhausting at the back end when filling the test medium into the vehicle hydrogen cylinder, and also for relieving pressure when the vehicle hydrogen cylinder is pressurized; a manual pressure relief valve arranged in parallel with the pneumatic control valve for relieving pressure through the manual pressure relief valve when the pneumatic control valve fails to relieve pressure; a first solenoid valve connected to the pneumatic control valve for controlling the automatic operation of the pneumatic control valve.

[0014] Among them, the medium filling and exhaust device also includes: a first pressure sensor, arranged at the outlet of the centrifugal pump, for automatically monitoring the pressure of the test medium before entering the double-acting device; a first pressure gauge, arranged at the outlet of the centrifugal pump, for manually monitoring the pressure of the test medium before entering the double-acting device; a first stop valve, arranged in parallel with the centrifugal pump, one end of the first stop valve is connected to the outlet of the centrifugal pump, and the other end of the first stop valve is connected to the medium tank, for regulating the outlet pressure of the centrifugal pump.

[0015] The medium filling and exhaust device further includes: a first temperature sensor, arranged on the medium box, for monitoring the temperature of the test medium in the medium box; a first air filter, arranged on the medium box, for preventing impurities in the air from entering the medium box; a first liquid level meter, arranged on the medium box, for manually observing the liquid level of the medium box; a first liquid level sensor, arranged on the highest allowable liquid level of the medium box, for automatically monitoring whether the liquid level of the medium box exceeds the highest allowable liquid level; a second liquid level sensor, arranged on the lowest allowable liquid level of the medium box, for automatically monitoring whether the liquid level of the medium box is lower than the lowest allowable liquid level; a second ball valve, respectively arranged between the medium box and the high and low temperature medium tank, for isolating the medium box from the high and low temperature medium tank; a third ball valve, arranged in parallel with the second ball valve, and having the same function as the second ball valve. A fourth ball valve, arranged on the medium box, is used to discharge sewage through the fourth ball valve when cleaning the medium box.

[0016] The servo hydraulic device includes: an oil tank for storing hydraulic oil; a servo reversing valve having two working modes; a first oil pipeline, one end of which is connected to the servo reversing valve and the other end is connected to the oil tank; a second oil pipeline, which is arranged in parallel with the first oil pipeline, one end of which is connected to the servo reversing valve and the other end is connected to the oil tank; a third oil pipeline, one end of which is connected to the left oil cylinder and the other end is connected to the servo reversing valve; a fourth oil pipeline, which is arranged in parallel with the third oil pipeline, one end of which is connected to the right oil cylinder and the other end is connected to the servo reversing valve; an oil pump, which is arranged on the first oil pipeline and is used to pressurize the hydraulic oil. The hydraulic oil is delivered to the oil cylinder; a second motor is used to provide power to the oil pump; wherein, when the servo reversing valve is in the first working mode, the hydraulic oil is delivered to the left oil cylinder via the first oil pipeline, the servo reversing valve, and the third oil pipeline, and the hydraulic oil is then returned to the oil tank from the right oil cylinder, the fourth oil pipeline, the servo reversing valve, and the second oil pipeline; when the servo reversing valve is in the second working mode, the hydraulic oil is delivered to the right oil cylinder via the first oil pipeline, the servo reversing valve, and the fourth oil pipeline, and the hydraulic oil is then returned to the oil tank from the left oil cylinder, the third oil pipeline, the servo reversing valve, and the first oil pipeline.

[0017] Among them, the servo hydraulic device further includes: a second oil suction filter, arranged between the oil pump and the fuel tank, for ensuring the cleanliness of the hydraulic oil entering the oil pump; a high-pressure filter, arranged between the servo directional valve and the oil pump, for ensuring the cleanliness of the hydraulic oil entering the servo directional valve; a fifth one-way valve, arranged between the high-pressure filter and the oil pump, for protecting the oil pump from reverse high-pressure impact; a second solenoid valve, arranged in parallel with the first oil pipeline, with one end connected to the outlet of the high-pressure filter and the other end connected to the fuel tank, serving as the no-load starting valve and emergency stop pressure relief valve of the first oil pipeline; a proportional relief valve, arranged in parallel with the first oil pipeline, with one end connected to the outlet of the high-pressure filter and the other end connected to the fuel tank, for pressure ratio adjustment of the first oil pipeline; a safety valve, arranged in series between the proportional relief valve and the fifth one-way valve, with one end connected to the proportional relief valve and the other end connected to the fifth one-way valve, for limiting the maximum pressure of the first oil pipeline; a first accumulator, arranged on a bypass connected to the outlet of the first oil pipeline, for the emergency power source, providing high-pressure and large-flow hydraulic oil to the servo directional valve instantaneously; a second accumulator, arranged in parallel with the first accumulator, with the same function as the first accumulator; a fifth ball valve, arranged between the first accumulator and the first oil pipeline, for isolating the first oil pipeline from the first accumulator; a sixth ball valve, arranged between the second accumulator and the first oil pipeline, for isolating the first oil pipeline from the second accumulator; a second pressure sensor, arranged at the outlet of the first oil pipeline, for automatically monitoring the pressure of the hydraulic oil before entering the servo directional valve; a second pressure gauge, arranged at the outlet of the first oil pipeline, for manually monitoring the pressure of the test medium before entering the servo directional valve; a chiller, arranged on the fuel tank, for cooling the hydraulic oil in the fuel tank; an oil return filter, arranged on the fuel tank, with one end connected to the fuel tank and the other end connected to the chiller, for circulating and filtering the hydraulic oil in the fuel tank; a first rubber hose, for connecting the chiller and the fuel tank; a second rubber hose, for connecting the chiller and the oil return filter; a third liquid level sensor, arranged at the highest allowable liquid level of the fuel tank, for automatically monitoring whether the liquid level of the fuel tank exceeds the highest allowable liquid level; a fourth liquid level sensor, arranged at the lowest allowable liquid level of the fuel tank, for automatically monitoring whether the liquid level of the fuel tank is lower than the lowest allowable liquid level; a second temperature sensor, arranged on the fuel tank, for monitoring the temperature of the hydraulic oil in the fuel tank; a second air filter, arranged on the fuel tank, for preventing impurities in the air from entering the fuel tank; a second liquid level gauge, arranged on the fuel tank, for manually observing the liquid level of the fuel tank.

[0018] Among them, the test system further includes a control air circuit, which includes a first control air circuit. A pressure regulating filter and oil mist separator is provided on the first control air circuit and is connected to the pneumatic control valve to provide control air for the pneumatic control valve. The control air circuit further includes a second control air circuit. A filter and pressure regulator, a third solenoid valve and a sixth one-way valve are provided on the second control air circuit. The sixth one-way valve is connected to the medium output pipeline. The filter and pressure regulator is used to blow impurities in the test medium in the medium output pipeline, and the third solenoid valve is used to control the automatic operation of the filter and pressure regulator. In addition, a third pressure sensor and a third pressure gauge are provided at the outlet of the medium output pipeline. The third pressure sensor is used to automatically monitor the pressure of the test medium before entering the vehicle hydrogen cylinder, and the third pressure gauge is used to automatically monitor the pressure of the test medium before entering the vehicle hydrogen cylinder.

[0019] The beneficial effects of the present utility model are as follows:

[0020] By adopting a test system composed of a double-acting supercharger, a medium filling and exhaust device, a servo hydraulic device, and a control device, the present utility model can realize high and low temperature fatigue pressurization experiments on vehicle hydrogen cylinders. Compared with the prior art that uses an electric pump to pressurize vehicle hydrogen cylinders, since hydraulic oil is used as the supercharging drive medium in this test system, the problem of limited types of test media is avoided. Since the adopted medium filling and exhaust device has functions of automatic heating and cooling, the problem of inconvenient heating and cooling of the test medium is avoided. Since a double-acting supercharger is used for supercharging, there is no limit to the size of the vehicle hydrogen cylinder.

[0021] Furthermore, the test system of the present utility model uses a control device to automatically operate the motor and valves, enabling automatic testing, thereby reducing the labor intensity of workers and improving the testing efficiency.

[0022] In addition, the test system of the present utility model is provided with multiple sensors and instruments for precision testing, which can improve the precision of high and low temperature fatigue performance testing of vehicle hydrogen cylinders (Type IV). Description of the Drawings

[0023] Figure 1 is a schematic diagram of the external structure of a high and low temperature fatigue pressurization test system for a vehicle hydrogen cylinder of the present utility model;

[0024] Figure 2 is a schematic diagram of the internal structure of a high and low temperature fatigue pressurization test system for a vehicle hydrogen cylinder of the present utility model. Detailed Embodiments

[0025] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

[0026] Please refer to Figure 1 ,Figure 1 is a schematic diagram of the external structure of a high and low temperature fatigue pressurization test system for a vehicle hydrogen cylinder of the present utility model. As Figure 1 shown, the test system includes a double-acting supercharger 10, a medium filling and exhaust device 20, a servo hydraulic device 30, and a control device 40.

[0027] The double-acting supercharger 10 is connected to the vehicle hydrogen cylinder and is used to pressurize the test medium and then transport it to the vehicle hydrogen cylinder.

[0028] The medium filling and exhaust device 20 is respectively connected to the double-acting supercharger 10 and the vehicle hydrogen cylinder, and is used to transport the test medium to the double-acting supercharger 10 and exhaust the vehicle hydrogen cylinder.

[0029] The servo hydraulic device 30 is connected to the double-acting supercharger 10 and is used to transport hydraulic oil to the double-acting supercharger 10. The hydraulic oil pushes the double-acting supercharger 10 to move, so as to pressurize the test medium.

[0030] The control device 40 is respectively connected to the medium filling and exhaust device 20 and the servo hydraulic device 30, and is used to control the control elements of the medium filling and exhaust device 20 and the servo hydraulic device 30 to work. The control elements include motors, electric valves, sensors, etc.

[0031] Specifically, please refer to Figure 2 , Figure 2 is a schematic diagram of the internal structure of a high and low temperature fatigue pressurization test system for a vehicle hydrogen cylinder of the present utility model.

[0032] The structure of the double-acting supercharger 10 is introduced below.

[0033] As Figure 2 shown, the double-acting supercharger 10 includes an oil cylinder 101, medium cylinders (102, 103), a first piston 104, a second piston 105, a third piston 106, four one-way valves (107, 108, 109, 110), a first proximity switch 111, a second proximity switch 112, a medium input pipeline 113, and a medium output pipeline 114.

[0034] The oil cylinder 101 is connected to the servo hydraulic device 20, and the hydraulic oil is transported to the oil cylinder 101 through the servo hydraulic device 20 and then returns to the servo hydraulic device 20.

[0035] The medium cylinders include a first medium cylinder 102 and a second medium cylinder 103. The first medium cylinder 102 and the second medium cylinder 103 are respectively arranged on both sides of the oil cylinder 101 and are respectively communicated with the oil cylinder 101. The test medium is transported to the first medium cylinder 102 or the second medium cylinder 103 by the medium filling and exhaust device.

[0036] The first piston 104 is arranged in the oil cylinder, dividing the oil cylinder into a left oil cylinder and a right oil cylinder. The first piston 104 reciprocates left and right in the oil cylinder 101. The second piston 105 is arranged in the first medium cylinder 102. The third piston 106 is arranged in the second medium cylinder 103. One end of the second piston 104 is connected to one end of the first piston 103, and one end of the third piston 106 is connected to the other end of the first piston 104. When the first piston 103 reciprocates, it drives the second piston 105 and the third piston 106 to reciprocate, so that the test medium is pressurized in the first medium cylinder 102 or the second medium cylinder 103.

[0037] It should be noted here that the cross-sectional area of the working surface pushed by the first piston 104 is larger than the cross-sectional area of the working surface pushed by the second piston 105 or the third piston 106. In this way, the medium is pressurized by pushing a small area with a large area to save power.

[0038] The four one-way valves are respectively a first one-way valve 107, a second one-way valve 108, a third one-way valve 109 and a fourth one-way valve 110. The test medium flows into or out of the medium cylinder through the four one-way valves.

[0039] The first proximity switch 111 is arranged on the left side of the oil cylinder 101 for sensing the leftward displacement of the first piston 104. The second proximity switch 112 is arranged on the right side of the oil cylinder 101 for sensing the rightward displacement of the first piston 104.

[0040] One end of the medium input pipeline 113 is connected to the medium cylinder, and the other end is connected to the medium filling and exhaust device 20 for transporting the test medium to the medium cylinder. One end of the medium output pipeline 114 is connected to the medium cylinder, and the other end is connected to the vehicle hydrogen cylinder for transporting the test medium to the vehicle hydrogen cylinder.

[0041] Among them, the end of the medium input pipeline 113 is divided into two branches and respectively connected to the first medium cylinder 102 and the second medium cylinder 103. The first one-way valve 107 is arranged between the first medium cylinder 102 and the medium input pipeline 113, and the test medium enters the first medium cylinder 102 through the first one-way valve 107. The second one-way valve 108 is arranged between the second medium cylinder 103 and the medium input pipeline 113, and the test medium enters the second medium cylinder 103 through the second one-way valve 108.

[0042] The starting section of the medium output pipeline 114 has two branches respectively connected to the first medium cylinder 102 and the second medium cylinder 103. The third one-way valve 109 is arranged between the first medium cylinder 102 and the medium output pipeline 114, and the test medium flows out of the first medium cylinder 102 through the third one-way valve 109. The fourth one-way valve 110 is arranged between the second medium cylinder 103 and the medium output pipeline 114, and the test medium flows out of the second medium cylinder 103 through the fourth one-way valve 110.

[0043] The following introduces the structure of the medium filling and exhaust device 20.

[0044] The medium filling and exhaust device includes a high and low temperature medium tank 201, a medium tank 202, a centrifugal pump 203, a first motor 204, a first oil suction filter 205, a first ball valve 206, a pneumatic control valve 207, a manual pressure relief valve 208, a first solenoid valve 209, a first pressure sensor 210, a first pressure gauge 211, a first stop valve 212, a first temperature sensor 213, a first air filter 214, a first liquid level gauge 215, a first liquid level sensor 216, a second liquid level sensor 217, a second ball valve 218, a third ball valve 219 and a fourth ball valve 220.

[0045] The high and low temperature medium tank 201 is used to heat or refrigerate the test medium.

[0046] The medium tank 202 is communicated with the high and low temperature medium tank 201 and is used to store the test medium from the high and low temperature medium tank 201.

[0047] The centrifugal pump 203 is connected to the medium input pipeline 113 and is used to pressurize the test medium and transport the test medium to the double-acting supercharger 10.

[0048] The first motor 204 is used to provide power for the centrifugal pump 203.

[0049] The first oil suction filter 205 is arranged between the centrifugal pump 203 and the medium tank 202 and is used to ensure the cleanliness of the test medium entering the centrifugal pump 203.

[0050] The first ball valve 206 is arranged between the first oil suction filter 205 and the medium tank 202 and is used to isolate the medium tank 202 from the first oil suction filter 205 and facilitate the cleaning of the filter element of the first oil suction filter 205.

[0051] The pneumatic control valve 207, one end of the pneumatic control valve 207 is connected to the medium output pipeline 113, and the other end of the pneumatic control valve 207 is connected to the medium tank 202. It is used for the rear-end exhaust when filling the test medium into the vehicle hydrogen cylinder, and also for the pressure relief after the vehicle hydrogen cylinder is pressurized.

[0052] A manual pressure relief valve 208, which is arranged in parallel with the pneumatic control valve 207, is used to relieve pressure through the manual pressure relief valve 208 when the pneumatic control valve 207 fails and cannot relieve pressure.

[0053] The first solenoid valve 209 is connected to the pneumatic control valve 207 and is used to control the automatic operation of the pneumatic control valve 207.

[0054] The first pressure sensor 210 is arranged at the outlet of the centrifugal pump 203 and is used to automatically monitor the pressure of the test medium before entering the double-acting actuator 10.

[0055] The first pressure gauge 211 is also arranged at the outlet of the centrifugal pump 203 and is used to manually monitor the pressure of the test medium before entering the double-acting actuator 10.

[0056] The first stop valve 212 is arranged in parallel with the centrifugal pump 203. One end of the first stop valve 212 is connected to the outlet of the centrifugal pump 203, and the other end of the first stop valve 212 is connected to the medium tank 202, and is used to regulate the outlet pressure of the centrifugal pump 203.

[0057] The first temperature sensor 213 is arranged on the medium tank 202 and is used to monitor the temperature of the test medium in the medium tank 202.

[0058] The first air filter 214 is arranged on the medium tank 202 and is used to prevent impurities in the air from entering the medium tank 202.

[0059] The first level gauge 215 is arranged on the medium tank 202 and is used to manually observe the liquid level of the medium tank 202.

[0060] The first level sensor 216 is arranged at the highest allowable liquid level of the medium tank 202 and is used to automatically monitor whether the liquid level of the medium tank 202 exceeds the highest allowable liquid level.

[0061] The second level sensor 217 is arranged at the lowest allowable liquid level of the medium tank 202 and is used to automatically monitor whether the liquid level of the medium tank 202 is lower than the lowest allowable liquid level.

[0062] The second ball valve 218 is arranged between the medium tank 202 and the high and low temperature medium tank 201 and is used to isolate the medium tank 202 from the high and low temperature medium tank 201.

[0063] The third ball valve 219 is arranged in parallel with the second ball valve 218 and has the same function as the second ball valve 218.

[0064] The fourth ball valve 220 is arranged on the medium tank 202 and is used for sewage discharge through the fourth ball valve 220 when cleaning the medium tank 202.

[0065] The structure of the servo hydraulic device 30 is introduced below. The servo hydraulic device 30 includes an oil tank 301, a servo directional valve 302, a first oil pipeline 303, a second oil pipeline 304, a third oil pipeline 305, a fourth oil pipeline 306, an oil pump 307, a second motor 308, a second oil suction filter 309, a high-pressure filter 310, a fifth one-way valve 311, a second solenoid valve 312, a proportional relief valve 313, a safety valve 314, a first accumulator 315, a second accumulator 316, a fifth ball valve 317, a sixth ball valve 318, a second pressure sensor 319, a second pressure gauge 320, a chiller 321, an oil return filter 322, a first rubber hose 323, a second rubber hose 324, a third liquid level sensor 325, a fourth liquid level sensor 326, a second temperature sensor 327, a second air filter 328, and a second liquid level gauge 329.

[0066] The oil tank 301 is used to store hydraulic oil.

[0067] One end of the first oil pipeline 303 is connected to the servo directional valve 302, and the other end is connected to the oil tank 301;

[0068] The second oil pipeline 304 is arranged in parallel with the first oil pipeline 303. One end is connected to the servo directional valve 302, and the other end is connected to the oil tank 301;

[0069] One end of the third oil pipeline 305 is connected to the left oil cylinder, and the other end is connected to the servo directional valve 302.

[0070] The fourth oil pipeline 306 is arranged in parallel with the third oil pipeline 305. One end is connected to the right oil cylinder, and the other end is connected to the servo directional valve 302.

[0071] The oil pump 307 is arranged on the first oil pipeline 303 and is used to pressurize the hydraulic oil and transport the hydraulic oil to the oil cylinder 201.

[0072] The second motor 308 is used to provide power for the oil pump 307.

[0073] The servo reversing valve 302 has two working modes. When the servo reversing valve 302 is in the first working mode, the hydraulic oil is conveyed to the left oil cylinder via the first oil pipeline 303, the servo reversing valve 302, and the third oil pipeline 305, and then returns from the right oil cylinder, the fourth oil pipeline 306, the servo reversing valve 302, and the second oil pipeline 304 to the fuel tank 301. When the servo reversing valve 302 is in the second working mode, the hydraulic oil is conveyed to the right oil cylinder via the first oil pipeline 303, the servo reversing valve 302, and the fourth oil pipeline 306, and then returns from the left oil cylinder, the third oil pipeline 305, the servo reversing valve 302, and the first oil pipeline 303 to the fuel tank.

[0074] The second oil suction filter 309 is arranged between the oil pump 307 and the fuel tank 301 to ensure the cleanliness of the hydraulic oil entering the oil pump 307.

[0075] The high-pressure filter 310 is arranged between the servo reversing valve 302 and the oil pump 307 to ensure the cleanliness of the hydraulic oil entering the servo reversing valve 302.

[0076] The fifth one-way valve 311 is arranged between the high-pressure filter 310 and the oil pump 307 to protect the oil pump 307 from reverse high-pressure impact.

[0077] The second solenoid valve 312 is arranged in parallel with the first oil pipeline 303, with one end connected to the outlet of the high-pressure filter 310 and the other end connected to the fuel tank 301, serving as the no-load starting valve and emergency stop pressure relief valve of the first oil pipeline 303.

[0078] The proportional relief valve 313 is arranged in parallel with the first oil pipeline 303, with one end connected to the outlet of the high-pressure filter 310 and the other end connected to the fuel tank 301, for pressure ratio adjustment of the first oil pipeline 303.

[0079] The safety valve 314 is arranged in series between the proportional relief valve 313 and the fifth one-way valve 311, with one end connected to the proportional relief valve 313 and the other end connected to the fifth one-way valve 311, for limiting the maximum pressure of the first oil pipeline 303.

[0080] The first accumulator 315 is arranged on a bypass connected to the outlet of the first oil pipeline 303, serving as an emergency power source to provide high-pressure and large-flow hydraulic oil to the servo reversing valve 302 instantaneously.

[0081] The second accumulator 316 is arranged in parallel with the first accumulator 315 and has the same function as the first accumulator 315.

[0082] The fifth ball valve 317 is arranged between the first accumulator 315 and the first oil pipeline 303, and is used to isolate the first oil pipeline 303 from the first accumulator 315.

[0083] The sixth ball valve 318 is arranged between the second accumulator 316 and the first oil pipeline 303, and is used to isolate the first oil pipeline 303 from the second accumulator 316. The connecting pipes between the first accumulator 315 and the fifth ball valve 317, between the fifth ball valve 317 and the first oil pipeline 303, between the second accumulator 316 and the sixth ball valve 318, and between the sixth ball valve 318 and the first oil pipeline 303 all adopt DN20.

[0084] The second pressure sensor 319 is arranged at the outlet of the first oil pipeline 303, and is used to automatically monitor the pressure of the hydraulic oil before entering the servo directional valve 302.

[0085] The second pressure gauge 320 is arranged at the outlet of the first oil pipeline 303, and is used to manually monitor the pressure of the test medium before entering the servo directional valve 302.

[0086] The oil chiller 321 is arranged on the fuel tank 301, and is used to cool the hydraulic oil in the fuel tank 301.

[0087] The return oil filter 322 is arranged on the fuel tank 301, one end is connected to the fuel tank 301, and the other end is connected to the oil chiller 321, and is used to circulate and filter the hydraulic oil in the fuel tank 301.

[0088] The first rubber hose 323 is used to connect the oil chiller 321 and the fuel tank 301.

[0089] The second rubber hose 324 is used to connect the oil chiller 321 and the return oil filter 322.

[0090] The third liquid level sensor 325 is arranged at the highest allowable liquid level of the fuel tank 301, and is used to automatically monitor whether the liquid level of the fuel tank 301 exceeds the highest allowable liquid level.

[0091] The fourth liquid level sensor 326 is arranged at the lowest allowable liquid level of the fuel tank 301, and is used to automatically monitor whether the liquid level of the fuel tank 301 is lower than the lowest allowable liquid level.

[0092] The second temperature sensor 327 is arranged on the fuel tank 301, and is used to monitor the temperature of the hydraulic oil in the fuel tank 301.

[0093] The second air filter 328 is arranged on the fuel tank 301, and is used to prevent impurities in the air from entering the fuel tank 301.

[0094] The second liquid level gauge 329 is arranged on the fuel tank 301 for manually observing the liquid level of the fuel tank 301.

[0095] In addition, the test system further includes a control air circuit (not labeled in the figure). The control air circuit includes a first control air circuit. A pressure regulating filter oil mist separator 401 is arranged on the first control air circuit. The pressure regulating filter oil mist separator 401 is connected to the pneumatic control valve 207 for providing control air for the pneumatic control valve 207. The control air circuit further includes a second control air circuit (not labeled in the figure). A filter pressure regulator 402, a third solenoid valve 403 and a sixth one-way valve 404 are arranged on the second control air circuit. The sixth one-way valve 404 is connected to the medium output pipeline 114. The filter pressure regulator 402 is used for purging impurities from the test medium in the medium output pipeline 114. The third solenoid valve 403 is used for controlling the automatic operation of the filter pressure regulator 402.

[0096] In addition, a third pressure sensor 501 and a third pressure gauge 502 are arranged at the outlet of the medium output pipeline 114. The third pressure sensor 501 is used for automatically monitoring the pressure of the test medium before entering the vehicle hydrogen cylinder. The third pressure gauge 502 is used for automatically monitoring the pressure of the test medium before entering the vehicle hydrogen cylinder.

[0097] Finally, it should be noted that the control device 40 includes an Advantech industrial computer, a Siemens PLC, Schneider electrical components, etc. The control device 40 automatically starts or closes the above-mentioned valves, motors, etc., so as to realize the automatic operation of the entire test system.

[0098] The working method of the present utility model is as follows:

[0099] Turn on the switch of the high and low temperature medium tank 201 to heat or cool the test medium, and then open the second ball valve 218 and the third ball valve 219 to make the test medium flow into the medium tank 202. The control device 40 starts the first motor 204 to work. The test medium in the medium tank 202 is pressurized by the centrifugal pump 203 and then conveyed into the first medium cylinder 102 and the second medium cylinder 103 of the double-acting supercharger 10. The control device 40 starts the second motor 308 to work. The hydraulic oil in the fuel tank 301 is pumped by the oil pump 307 and then conveyed to the first oil pipeline 303.

[0100] The control device 40 starts the operation of the servo reversing valve 302. The hydraulic oil flows into the left oil cylinder or the right oil cylinder of the double-acting supercharger 10 through the servo reversing valve 302. After the hydraulic oil enters the oil cylinder, it pushes the first piston 104 to move left or right, and then drives the second piston 105 or the third piston 106 to move left or right, so that the test medium in the first medium cylinder 102 or the second medium cylinder 103 is pressurized. The pressurized test medium flows out through the third one-way valve 109 or the fourth one-way valve 110 and is sent to the vehicle hydrogen cylinder. Then the servo reversing valve 302 changes its direction, and the first piston 104 moves in the opposite direction, and then drives the second piston 105 or the third piston 106 to move in the opposite direction, so that the test medium in the second medium cylinder 103 or the first medium cylinder 102 is pressurized. The pressurized test medium flows out through the fourth one-way valve 110 or the third one-way valve 109 and is sent to the vehicle hydrogen cylinder. As the servo reversing valve 302 continuously changes its direction, the first piston 104 makes a reciprocating motion, and then drives the second piston 105 or the third piston 106 to make a reciprocating motion, so that the test medium is pressurized in the first medium cylinder 102 or the second medium cylinder 103 and then sent to the vehicle hydrogen cylinder.

[0101] As the test medium continuously enters the vehicle hydrogen cylinder, the pressure in the vehicle hydrogen cylinder continuously increases. When the pressure reaches the preset value, the control device 40 opens the first solenoid valve 209 to start the operation of the pneumatic control valve 207, so that the air in the vehicle hydrogen cylinder is discharged to ensure the stable pressure after refueling the vehicle hydrogen cylinder.

[0102] The above is a specific description of the preferred embodiment of the present invention, but the present invention is not limited to the described embodiment. Those skilled in the art can also make various equivalent deformations or substitutions without departing from the spirit of the present invention, and these equivalent deformations or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A high and low temperature fatigue pressurization test system for hydrogen cylinders for vehicles, characterized in that: include: A double-acting supercharger connected to the vehicle hydrogen cylinder and used to pressurize the test medium and then deliver it to the vehicle hydrogen cylinder; A medium filling and exhaust device, used for delivering the test medium to the double-acting supercharger and exhausting the vehicle hydrogen cylinder; A servo hydraulic device, used for delivering hydraulic oil to the double-acting intensifier, wherein the hydraulic oil pushes the double-acting intensifier to move, thereby pressurizing the test medium; The control device is used to control the control elements of the medium-filled exhaust device and the servo-hydraulic device to work.

2. The test system according to claim 1, characterized in that: The double-acting supercharger comprises: An oil cylinder connected to the servo hydraulic device, wherein the hydraulic oil is delivered to the oil cylinder through the servo hydraulic device and then returned to the servo hydraulic device; The medium cylinder comprises a first medium cylinder and a second medium cylinder, wherein the first medium cylinder and the second medium cylinder are respectively arranged on both sides of the oil cylinder and are connected to the oil cylinder, and the test medium is transported to the first medium cylinder or the second medium cylinder by the medium filling and exhausting device; A first piston is disposed in the oil cylinder, dividing the oil cylinder into a left oil cylinder and a right oil cylinder, and the first piston performs left-right reciprocating motion in the oil cylinder; A second piston is disposed in the first medium cylinder; A third piston is disposed in the second medium cylinder, the second piston is connected to one end of the first piston, and the third piston is connected to the other end of the first piston, and when the first piston reciprocates, the second piston and the third piston are driven to reciprocate, so that the test medium is pressurized in the first medium cylinder or the second medium cylinder; four one-way valves, through which the test medium flows into or out of the medium cylinder; Two proximity switches, respectively arranged on the left and right sides of the oil cylinder, for sensing the displacement of the first piston to the left or right; A medium input pipeline, connected to the medium filling and exhausting device, for conveying the test medium to the medium cylinder; The medium output pipeline is connected to the vehicle hydrogen cylinder and is used to transport the test medium to the vehicle hydrogen cylinder.

3. The test system according to claim 2, characterized in that: The cross-sectional area of ​​the first piston pushing to do work is greater than the cross-sectional area of ​​the second piston or the third piston pushing to do work.

4. The test system according to claim 3, characterized in that: The medium-filled exhaust device comprises: A high and low temperature medium tank, used for heating or cooling the test medium; A medium box, used for storing the test medium from the high and low temperature medium tank; A centrifugal pump connected to the medium input pipeline and used to pressurize the test medium and deliver the test medium to the double-acting intensifier; A first motor, used to provide power to the centrifugal pump; A first oil suction filter is provided between the centrifugal pump and the medium box, and is used to ensure the cleanliness of the test medium entering the centrifugal pump; The first ball valve is arranged between the first oil suction filter and the medium box, and is used to isolate the medium box from the first oil suction filter and facilitate cleaning of the filter element of the first oil suction filter.

5. The test system according to claim 4, characterized in that: The medium-filled exhaust device also includes: An air-controlled valve, one end of which is connected to the medium output pipeline, and the other end of which is connected to the medium box, and is used for exhausting the vehicle hydrogen cylinder when the test medium is filled into the vehicle hydrogen cylinder, and also for relieving the pressure after the vehicle hydrogen cylinder is pressurized; A manual pressure relief valve is arranged in parallel with the gas control valve, and is used to relieve pressure through the manual pressure relief valve when the gas control valve fails to relieve pressure; A first solenoid valve, wherein the first solenoid valve is connected to the air-controlled valve and is used to control the air-controlled valve to work automatically.

6. The test system according to claim 5, characterized in that: The medium-filled exhaust device also includes: a first pressure sensor, disposed at the outlet of the centrifugal pump, for automatically monitoring the pressure of the test medium before entering the double-acting device; a first pressure gauge, disposed at the outlet of the centrifugal pump, for manually monitoring the pressure of the test medium before entering the double-acting device; A first stop valve is arranged in parallel with the centrifugal pump, one end of the first stop valve is connected to the outlet of the centrifugal pump, and the other end of the first stop valve is connected to the medium tank, and is used to regulate the outlet pressure of the centrifugal pump.

7. The test system according to claim 6, characterized in that: The medium-filled exhaust device also includes: A first temperature sensor is disposed on the medium box and is used to monitor the temperature of the test medium in the medium box; A first air filter, disposed on the media box, for preventing impurities in the air from entering the media box; A first liquid level meter, disposed on the medium box, for manually observing the liquid level of the medium box; A first liquid level sensor is arranged at the maximum allowable liquid level of the medium box, and is used to automatically monitor whether the liquid level of the medium box exceeds the maximum allowable liquid level; A second liquid level sensor is disposed at the lowest allowable liquid level of the medium box and is used to automatically monitor whether the liquid level of the medium box is lower than the lowest allowable liquid level; A second ball valve is disposed between the medium box and the high and low temperature medium tank, respectively, and is used to isolate the medium box from the high and low temperature medium tank; a third ball valve, arranged in parallel with the second ball valve, and having the same function as the second ball valve; The fourth ball valve is arranged on the medium box and is used for discharging sewage through the fourth ball valve when cleaning the medium box.

8. The test system according to claim 7, characterized in that: The servo hydraulic device comprises: Oil tank, used to store hydraulic oil; Servo reversing valve, with two working modes; A first oil delivery pipeline, one end of which is connected to the servo reversing valve, and the other end of which is connected to the oil tank; A second oil pipeline is arranged in parallel with the first oil pipeline, one end of which is connected to the servo reversing valve and the other end of which is connected to the oil tank; A third oil delivery pipeline, one end of which is connected to the left oil cylinder, and the other end of which is connected to the servo reversing valve; a fourth oil pipeline, arranged in parallel with the third oil pipeline, one end of which is connected to the right oil cylinder, and the other end of which is connected to the servo reversing valve; An oil pump, disposed on the first oil delivery pipeline, for pressurizing the hydraulic oil and delivering the hydraulic oil to the oil cylinder; a second motor, used to provide power to the oil pump; Among them, when the servo reversing valve is in the first working mode, the hydraulic oil is transported to the left cylinder via the first oil pipeline, the servo reversing valve, and the third oil pipeline, and the hydraulic oil is then returned to the oil tank from the right cylinder, the fourth oil pipeline, the servo reversing valve, and the second oil pipeline; when the servo reversing valve is in the second working mode, the hydraulic oil is transported to the right cylinder via the first oil pipeline, the servo reversing valve, and the fourth oil pipeline, and the hydraulic oil is then returned to the oil tank from the left cylinder, the third oil pipeline, the servo reversing valve, and the first oil pipeline.

9. The test system according to claim 8, characterized in that: The servo hydraulic device also includes: A second oil suction filter is provided between the oil pump and the oil tank, and is used to ensure the cleanliness of the hydraulic oil entering the oil pump; A high-pressure filter, disposed between the servo reversing valve and the oil pump, for ensuring the cleanliness of the hydraulic oil entering the servo reversing valve; a fifth one-way valve, disposed between the high-pressure filter and the oil pump, for protecting the oil pump from reverse high-pressure shock; a second solenoid valve, arranged in parallel with the first oil pipeline, one end of which is connected to the outlet of the high-pressure filter and the other end of which is connected to the oil tank, and serves as a no-load starting valve and an emergency stop pressure relief valve of the first oil pipeline; A proportional relief valve is arranged in parallel with the first oil pipeline, one end of which is connected to the outlet of the high-pressure filter and the other end is connected to the oil tank, and is used for proportional pressure adjustment of the first oil pipeline; a safety valve, which is arranged in series between the proportional relief valve and the fifth one-way valve, one end of which is connected to the proportional relief valve and the other end of which is connected to the fifth one-way valve, and is used to limit the maximum pressure of the first oil pipeline; A first accumulator is arranged on a bypass connected to the outlet of the first oil pipeline and is used as an emergency power source to instantly provide high-pressure and high-flow hydraulic oil to the servo reversing valve; a second accumulator, arranged in parallel with the first accumulator, and having the same function as the first accumulator; a fifth ball valve, disposed between the first accumulator and the first oil pipeline, for isolating the first oil pipeline from the first accumulator; a sixth ball valve, disposed between the second accumulator and the first oil pipeline, for isolating the first oil pipeline from the second accumulator; a second pressure sensor, disposed at the outlet of the first oil pipeline, for automatically monitoring the pressure of the hydraulic oil before entering the servo reversing valve; a second pressure gauge, disposed at the outlet of the first oil pipeline, for manually monitoring the pressure of the test medium before entering the servo reversing valve; An oil cooler, arranged on the oil tank, for cooling the hydraulic oil in the oil tank; An oil return filter is arranged on the oil tank, one end of which is connected to the oil tank and the other end of which is connected to the oil cooler, and is used for circulating and filtering the hydraulic oil in the oil tank; A first rubber hose, used to connect the oil cooler and the oil tank; A second rubber hose, used to connect the oil cooler and the oil return filter; A third liquid level sensor is arranged at the maximum allowable liquid level of the oil tank, and is used to automatically monitor whether the liquid level of the oil tank exceeds the maximum allowable liquid level; a fourth liquid level sensor, arranged at the minimum allowable liquid level of the oil tank, for automatically monitoring whether the liquid level of the oil tank is lower than the minimum allowable liquid level; A second temperature sensor is disposed on the oil tank and is used to monitor the temperature of the hydraulic oil in the oil tank; A second air filter is disposed on the fuel tank to prevent impurities in the air from entering the fuel tank; The second liquid level meter is arranged on the oil tank and is used for manually observing the liquid level of the oil tank.

10. The test system according to claim 9, characterized in that: The test system further includes a control gas circuit, wherein the control gas circuit includes a first control gas circuit, wherein a pressure regulating filter oil mist device is provided on the first control gas circuit, and the pressure regulating filter oil mist device is connected to the gas control valve to provide control gas for the gas control valve; The control gas circuit also includes a second control gas circuit, on which a filter pressure regulator, a third solenoid valve and a sixth one-way valve are arranged, the sixth one-way valve is connected to the medium output pipeline, the filter pressure regulator is used to blow out impurities from the test medium in the medium output pipeline, and the third solenoid valve is used to control the filter pressure regulator to work automatically; In addition, a third pressure sensor and a third pressure gauge are also provided at the outlet of the medium output pipeline. The third pressure sensor is used to automatically monitor the pressure of the test medium before entering the vehicle hydrogen cylinder, and the third pressure gauge is used to automatically monitor the pressure of the test medium before entering the vehicle hydrogen cylinder.

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