A high-temperature working test device and test method for a pressurized fuel tank of a helicopter

Abstract

The application belongs to the field of aircraft design, and discloses a high-temperature working test device and test method for a pressurized tank of a helicopter. The device comprises a high-temperature hydraulic pump station, a tooling table and a control module; the tooling table is used for fixing two tested hydraulic pressurized tanks; the high-temperature hydraulic pump station is used for providing a hydraulic oil source with required pressure, temperature and flow for the test, and circulating the hydraulic oil in the tested hydraulic pressurized tank to simulate the working state on the helicopter; the control module is used for controlling the high-temperature hydraulic pump station; the high-temperature hydraulic pump station is connected with the tooling table through a control / signal cable; the high-temperature hydraulic pump station is also connected with a power cable; and the high-temperature hydraulic pump station is also connected with the tested hydraulic pressurized tanks on the tooling table through four hydraulic rubber pipes.

Description

Technical Field

[0001] This invention belongs to the field of aircraft design and discloses a high-temperature working test device and test method for helicopter pressurized fuel tanks. Background Technology

[0002] The high-temperature operation test of the hydraulic booster tank is an important performance test item for hydraulic booster tanks. It is a necessary means to verify whether the function and performance of the hydraulic booster tank meet the requirements of the finished product technical specifications. The high-temperature operation test of the hydraulic booster tank is an important test used to assess the adaptability of the hydraulic booster tank to work under high-temperature conditions.

[0003] The hydraulic booster tank operates on the principle of hydraulic boosting and consists of two chambers: an oil reservoir and a booster chamber. These two chambers are not interconnected. When the oil reservoir is pressurized and the booster chamber is vented with return oil, the piston rod extends outward; conversely, when the booster chamber is pressurized and the oil reservoir is vented with return oil, the piston rod retracts inward. The piston maintains dynamic balance when the booster chamber pressure is 10 MPa and the oil reservoir pressure is 0.25 MPa.

[0004] The ambient temperature for high-temperature working tests shall be in accordance with the "hot" climate type (the conditions specified in the inducing conditions column) in "Table 1 High-Temperature Daily Cycle" of GJB150.3A-2009 "Laboratory Environmental Test Methods for Military Equipment - High-Temperature Test", as detailed in Table 1.

[0005] Table 1 High Temperature Daily Cycle

[0006] Temperature change rate: generally not exceeding 3℃ / min.

[0007] Duration of high-temperature working test: 3 cycles (each cycle is 24 hours).

[0008] The fuel tank was exposed to the temperature conditions in Table 1 (the first cycle started at 71°C corresponding to 1500°C), with each cycle lasting 24 hours. A total of 3 cycles were performed, totaling 72 hours.

[0009] Because the high-temperature working test of the hydraulic booster tank needs to realistically simulate the high-temperature working state of the hydraulic booster tank on the aircraft, and ensure that the working fluid temperature of the tank is 110℃±5℃ during the operation, and fully consider the efficiency of the work so that two tanks can be tested at the same time, there is no such equipment in the existing technology. Therefore, it is necessary to invent a high-temperature working test device and test method for helicopter hydraulic booster tanks. Summary of the Invention

[0010] Purpose of the invention: To provide a high-temperature working test device and test method for helicopter hydraulic booster tanks.

[0011] To address the aforementioned technical issues, this application provides a high-temperature working test device for helicopter hydraulic booster tanks, comprising: a high-temperature hydraulic pump station, a tooling table, and a control module; The tooling table is used to fix two hydraulic booster tanks for testing. The high-temperature hydraulic pump station is used to provide the hydraulic oil source with the required pressure, temperature and flow rate for the test, and at the same time circulates the hydraulic oil in the hydraulic booster tank under test to simulate the working state on the machine. The control module is used to control the high-temperature hydraulic pump station; The high-temperature hydraulic pump station is connected to the tooling table via a control / signal cable; The high-temperature hydraulic pump station is also connected to a power cable; The high-temperature hydraulic pump station is also connected to the test hydraulic booster tank on the tooling table via four hydraulic hoses.

[0012] Furthermore, the tooling table includes: The mounting base plate serves as platform support and is installed inside the environmental chamber. Four clamp sliding guide rails are fixed parallel to each other on the mounting base plate; A set of test hydraulic booster tank fixing brackets are installed on two adjacent clamp sliding guide rails, and a test hydraulic booster tank is fixed together by a set of test hydraulic booster tank fixing brackets; The sliding guide rail with locking device is used to fix the test hydraulic booster tank mounting bracket; The mounting base plate has a micro switch sliding rail with its upper surface edge parallel to the clamp sliding rail; Two microswitches are respectively mounted on microswitch sliding rails, and the two sliding rails are equipped with locking devices to lock the two microswitches. The oil storage chambers of the two tested hydraulic booster tanks are connected; the oil storage chambers and booster chambers of the two tested hydraulic booster tanks are respectively connected to a high-temperature hydraulic pump station through four hydraulic hoses.

[0013] Furthermore, the high-temperature hydraulic pump station includes: The platform serves as support for the pumping station; The quick-connect coupling panel has four hydraulic plugs, which connect to four hydraulic hoses respectively; One of the oil storage chamber outlet hydraulic plugs is divided into two passages by a solenoid valve group, which are respectively connected to the inlet of two high-temperature motor pump groups. The outlets of the two high-temperature motor pump groups are merged after passing through a check valve. A first pressure transmitter is installed at the merging point. After merging, the flow passes through a pressure oil filter, a radiator and a heating component in sequence before being connected to the other oil storage chamber return hydraulic plug. The 10MPa pressure device is connected to the hydraulic plugs of the two booster chambers respectively. The 10MPa pressure device is used to boost or depressurize the booster chambers of the hydraulic booster tank under test.

[0014] Furthermore, the solenoid valve assembly includes: a first check valve, a second check valve, a first solenoid valve, and a second solenoid valve; The first check valve and the second check valve are connected in series, and a sealing test interface S is provided between the first check valve and the second check valve; The inlet of the first check valve is connected to the hydraulic plug of the oil storage chamber, and the outlet of the second check valve is connected to the outlet of the first solenoid valve and then connected to the high-temperature motor pump unit. The inlet of the first check valve is connected to the inlet of the first solenoid valve, and the second solenoid valve is connected in parallel with the first check valve.

[0015] Furthermore, an oil inlet is connected between the solenoid valve assembly and the hydraulic plug at the oil outlet of the oil reservoir, and the oil inlet is equipped with a temperature transmitter; A pressure gauge is also connected between the solenoid valve assembly and the hydraulic plug at the oil outlet of the oil reservoir. The outlet of the first solenoid valve is connected to a second pressure transmitter.

[0016] Furthermore, the 10MPa pressure device includes: Pressure tank, used to supply test pressure oil; The electric pump unit draws pressurized oil from the pressure oil tank; The outlet of the motor pump unit is connected to the pressure oil tank via an overflow valve; The outlet of the motor pump unit is connected to the inlet of the third check valve, and the outlet of the third check valve is connected to the hydraulic plugs of the two booster chambers. The outlet of the third check valve is also connected to the inlet of the third solenoid valve, and the outlet of the third solenoid valve is connected to the pressure oil tank.

[0017] A high-temperature operation test method for helicopter hydraulic booster tanks, the process of which is as follows: Step 1: Fixing and connecting the two hydraulic booster tanks under test; Step 2: Fill the reservoirs of the two tested hydraulic booster tanks with working fluid through the oil inlet. Step 3: Perform a sealing test at the sealing test interface S. If there is no leakage, proceed to the next step. Step 4: Start the high-temperature motor pump unit to circulate the flow; Step 5: Supply oil to the pressure chamber of the hydraulic booster tank under test through a 10MPa pressure device, so that the piston of the hydraulic booster tank under test maintains dynamic balance at the normal oil level, thereby maintaining the oil storage chamber pressure of the hydraulic booster tank under test at 0.25MPa. Step Six: Activate the heating component to heat the hydraulic oil in the reservoir of the hydraulic booster tank under test from 10℃ to the target temperature of 110℃±5℃ within 1 hour; Step 7: After reaching the target temperature, turn on the environmental chamber and conduct three rounds of cyclic testing at the specified temperature.

[0018] Furthermore, during the test, when the pressure difference between the first pressure transmitter and the second pressure transmitter is less than 0.1 MPa, it is determined that the high-temperature pump set is damaged and the system is switched to another high-temperature pump set.

[0019] Furthermore, the pressure of the relief valve is set to 10 MPa; Furthermore, the method also includes: Step 8: Connect an open auxiliary oil tank to the sealing test interface S and conduct a telescoping performance test on the tested hydraulic booster oil tank under high temperature conditions; Step 9: During the test, the open auxiliary oil tank serves as the oil storage device for the high-temperature motor pump unit. When the piston rod of the hydraulic booster tank under test extends and retracts, it triggers the micro switch installed on the tooling table as a reversing or stopping signal; the high-temperature pump unit and motor pump unit are started. Step 10: When the first and second solenoid valves are de-energized and the third solenoid valve is energized, the oil inlet chamber of the hydraulic booster tank under test enters the booster chamber and the oil outlet chamber returns, and the piston rod of the tank extends; when the piston rod triggers the micro switch, the reversal is controlled by the set program, and the process proceeds to Step 11. Step 11: When the first and second solenoid valves are energized simultaneously and the third solenoid valve is de-energized, the oil storage chamber of the tested hydraulic booster tank returns oil and the booster chamber receives oil, and the piston rod of the tank retracts; when the piston rod triggers the micro switch, the reversal is controlled by the set program, and the process returns to step 10. Step 12: Repeat steps 10 and 11 until the required number of cycles is reached.

[0020] In summary, the beneficial effects of the present invention are as follows: With the increasing number of helicopter models using hydraulic booster tanks, the tank testing tasks are becoming more demanding. This invention can ensure that the high-temperature operation test of the hydraulic booster tank can realistically simulate the high-temperature operating state of the working fluid in the on-board hydraulic booster tank at 110℃±5℃, thus reproducing its approximate on-board operating state. This provides a basis for product designers to optimize product design or improve the overall performance design of the product. Furthermore, it can simultaneously conduct high-temperature operation tests on two tanks, improving testing efficiency, shortening the testing cycle, and reducing testing costs. Attached Figure Description

[0021] Figure 1 Composition of the experimental setup; Figure 2 : Structural diagram of a high-temperature hydraulic pump station; Figure 3 Hydraulic schematic diagram of control valve group; Figure 4 Tooling table structure diagram; Figure 5 Hydraulic schematic diagram for high-temperature working test; Explanation of markings in the diagram: 1-High-temperature hydraulic pump station; 2-Tooling platform; 3-Hydraulic hose with quick-connect coupling; 4-Control / signal cable with aviation plug; 5-Power cable with industrial plug; 6-High-temperature hydraulic pump station frame; 7-10MPa pressure device; 8-High-temperature motor pump set; 9-High-temperature control group; 10-Pressure oil filter; 11-Radiator; 12-Heating component; 13-Hydraulic oil circuit quick-connect coupling panel; 14-Aviation plug panel; 15-Industrial plug panel; 16-Measurement and control module; 17-Tooling platform mounting base; 18-Tested hydraulic booster tank fixing bracket; 19-Clamp sliding guide rail; 20-Clamp guide rail locking device; 21-Micro switch sliding guide rail; 22-Micro switch guide rail locking device; 71-Oil tank; 72-Motor pump set; 91-Check valve; 92-Solenoid valve; 93-Relief valve; 94-Pressure transmitter; 95-Temperature transmitter. Detailed Implementation

[0022] A high-temperature operating test device for helicopter hydraulic booster tanks, such as Figure 1 As shown, the test apparatus includes: a high-temperature hydraulic pump station 1, a tooling platform 2, a hydraulic hose with quick-connect couplings 3, a control / signal cable with an aviation plug 4, and a power cable with an industrial plug 5. The high-temperature hydraulic pump station 1 provides the necessary hydraulic oil source for the tested hydraulic booster tank; the tooling platform 2 provides an installation platform for the tested hydraulic booster tank; the high-temperature hydraulic pump station 1 and the tooling platform 2 are connected via the hydraulic hose with quick-connect couplings 3 and the control / signal cable with an aviation plug 4; the hydraulic hose 3 is wrapped with a rubber insulation sleeve; the high-temperature hydraulic pump station 1 is connected to the outer pipe joint of the high-low temperature chamber via the hydraulic hose 3, using a 74° flared connection (HB4-1-83); the inner pipe joint of the high-low temperature chamber is connected to the tested hydraulic booster tank via the hydraulic hose 3. The internal pipeline joints are connected in a 74° flared connection (HB4-1-83), while the hydraulic booster tank under test is connected in a 24° non-flared connection (HB5970-86). The hydraulic hose 3 facilitates the delivery and discharge of oil between the high-temperature hydraulic pump station and the hydraulic booster tank under test. The control / signal cable 4 with an aviation plug transmits the piston rod extension and retraction reversal signals during the test of the hydraulic booster tank under test. The power cable 5 is connected to the high-temperature hydraulic pump station 1 via an industrial plug panel. The power cable 5 is connected to an external power source to provide power to the test device.

[0023] like Figure 2The high-temperature hydraulic pump station 1 includes a frame 6, a 10MPa pressure device 7, a high-temperature motor pump assembly 8, a high-temperature control valve assembly 9, a pressure oil filter 10, a radiator 11, a heating component 12, a hydraulic circuit quick-connect coupling panel 13, an aviation plug panel 14, an industrial plug panel 15, and a measurement and control module 16. The frame 6 provides an installation platform for all accessories in the high-temperature hydraulic pump station, and is equipped with rollers and push handles for easy movement of the high-temperature hydraulic pump station. The 10MPa pressure device 7 is connected to the P3 and T ports of the control valve assembly 9 via hydraulic hoses 3, and is used to supply the test fluid... The pressure boosting tank provides a 10MPa pressure oil source; the high-temperature motor pump unit 8 contains two sets of motor pump units (motor speed 0~4000rpm, pump displacement 1.2ml / r, pressure 20bar), one of which serves as a redundancy backup; the high-temperature motor pump unit 8.1 is connected to the P1, A1, and A2 ports of the control valve group 9 via hydraulic hose 3; the high-temperature motor pump unit 8.2 is connected to the P2, A1, and A2 ports of the control valve group 9 via hydraulic hose 3, and is used to provide a 0.25MPa pressure oil source to the oil storage chamber of the tested hydraulic boosting tank; Figure 3 The high-temperature control valve assembly 9 includes a check valve 91, a solenoid valve 92, a relief valve 93, a pressure transmitter 94, and a temperature transmitter 95, used to control the flow rate, pressure, and direction of the hydraulic oil source. The inlet of the pressure oil filter 10 is connected to the E port of the control valve assembly 9 via a hydraulic hose 3, and the outlet of the pressure oil filter 10 is connected to the inlet of the radiator 11 via a hydraulic hose 3, used to control the oil contamination level to meet or exceed the requirements of GJB420B. The test requirements are as follows: The oil outlet of radiator 11 is connected to the oil inlet of heating assembly 12 via hydraulic hose 3 to maintain a dynamic stability of 110℃±5℃ in the oil storage chamber of the tested hydraulic booster tank during high-temperature operation. The oil outlet of heating assembly 12 is connected to port A1 of the inner pipe connector of hydraulic quick-connect coupling panel 13 via hydraulic hose 3, including two 1kW heaters for heating the passing oil, and one or two heaters can be selected for oil heating via programmable control. The inner pipe connector of hydraulic quick-connect coupling panel 13 is connected to ports B1, B2, and C of control valve group 9 via hydraulic hose 3. The outer pipe connector of hydraulic quick-connect coupling panel 13 is connected to the high-temperature hydraulic booster tank storage chamber via hydraulic hose 3. The external pipe joint of the cryogenic chamber is a 74° flared connection (HB4-1-83) to provide the oil supply and discharge path between the high-temperature hydraulic pump station and the tested hydraulic booster tank. The aviation plug panel 14 is connected to the micro switch signal line of the tooling table through the control / signal cable 4 to transmit the piston rod extension and retraction reversal signal during the test of the tested hydraulic booster tank. The industrial plug panel 15 is connected to an external AC380V power supply through the power cable 5 to provide power to the high-temperature pump station. The measurement and control module 16 is based on PLC control and uses a 12-inch HMI high-definition touch screen as the operating interface to monitor and control the test status in real time and record test data during the test.

[0024] like Figure 4 The fixture 2 includes a mounting base plate 17, a test hydraulic booster tank mounting bracket 18, a clamp sliding guide rail 19, a clamp guide rail locking device 20, a micro switch sliding guide rail 21, and a micro switch guide rail locking device 22. It can simultaneously mount two test hydraulic booster tanks for testing. During testing, the fixture 2 is mounted on the guide rail plate of the high and low temperature test chamber (environmental chamber). The mounting base plate 17 provides an installation platform for the fixture accessories. The test hydraulic booster tank mounting bracket 18 uses pull-button clamps with oil-resistant rubber inside to reduce wear on the tank surface and facilitate quick fixing of the test hydraulic booster tank. Two pull-button clamps are respectively mounted on the clamp sliding guide rail 19, which is fixed to the mounting base plate 17. The locking device 20 facilitates quick switching and fixing of the large and small oil tanks; two microswitches are respectively installed on the microswitch sliding rail 21, which is fixedly installed on the mounting base plate 17. The sliding rail with locking device 22 facilitates fixing of the microswitches when switching between the large and small oil tanks; the microswitches are used to provide reversing signals for the piston rod to extend and retract during the test of the hydraulic booster oil tank; the oil ports A1, A2, B1, and B2 of the hydraulic booster oil tank under test are connected to the inner pipeline joint of the high and low temperature chamber through the hydraulic hose 3. The connection form of the inner end joint of the high and low temperature chamber is the 74° flared connection form (HB4-1-83), and the connection form of the end joint of the hydraulic booster oil tank is the 24° non-flared connection form (HB5970-86).

[0025] A method for high-temperature operation testing of helicopter hydraulic booster tanks, such as... Figure 4 Two hydraulic booster tanks were fixed in place using a tank mounting bracket 18 with internal oil-resistant rubber pads and pull-tab steel ring clamps. The steel ring clamps were installed on the sliding rail 19 and locked with a locking slider 20. The fixture table 2 was then installed on the guide rail plate inside the high-temperature test chamber. The hydraulic booster tanks under test were then connected to the... Figure 2 High-temperature hydraulic pump station uses hydraulic hose 3 for connection.

[0026] Hydraulic schematic diagram of high temperature hydraulic pump station as follows Figure 5As shown, the tested hydraulic booster tank serves as the oil storage device for the high-temperature motor pump unit 8 during the high-temperature working test. The two test tanks are filled with working fluid (approximately 16L in total) at the oil inlet. After venting the hydraulic pipeline system through port S of control valve group 9, a sealing test is performed. Once no leakage is found in the hydraulic pipeline system, the high-temperature motor pump unit 8.1 is started to circulate the hydraulic system. High-temperature motor pump units 8.1 and 8.2 serve as backups for each other. The inlet and outlet pressures of the high-temperature motor pump unit 8 are detected through pressure transmitter 94. When the pressure difference between pressure transmitters 94.1 and 94.2 is less than 0.1... When the pressure reaches 10 MPa, it is determined that the high-temperature pump unit is damaged, and the backup high-temperature pump is started. The pump unit 72 in the 10 MPa pressure device 7 is started to supply oil to the pressure chamber of the hydraulic booster tank under test. The overflow valve 93 (pressure range of 0.4 to 35 MPa) is set to 10 MPa. The solenoid valve 92.3 is energized, and the main pump of the pump unit 72 continuously provides 10 MPa pressure to the system, so that the piston of the oil tank under test maintains dynamic balance at the normal oil level, thereby making the oil storage chamber pressure of the oil tank under test 0.25 MPa. The dynamic balance of the hydraulic oil tank can be maintained by adjusting the speed of the motor of the high-temperature motor pump unit 8.1. Start the heating assembly 12 and use two heaters to heat the hydraulic oil in the system; raise the temperature of the working fluid in the test tank from 10℃ to the target temperature of 110℃±5℃ within 1 hour; the working fluid temperature in the test tank is obtained through the temperature transmitter 95; after the target working fluid temperature is achieved, start the high temperature test chamber and conduct 3 cycles of testing at the temperature specified in Table 1; during the test, when the working fluid temperature is higher than the target temperature, the program controls the selection to shut down one heater in the heating assembly 12 or open the radiator 11; when the working fluid temperature is lower than the target temperature, close the radiator 11 and open the closed heater, so that the target temperature of the hydraulic oil tank working fluid of 110℃±5℃ can be dynamically stabilized under different ambient temperatures as shown in Table 1, thereby realizing the high temperature working state of the hydraulic booster tank on the simulator. Additionally, with an external open auxiliary oil tank connected at point S, the expansion and contraction performance test (high-temperature durability test) of the tested hydraulic booster tank under high-temperature conditions can be achieved. During the test, the auxiliary oil tank serves as the oil storage device for the high-temperature motor pump group 8. The extension and retraction of the piston rod of the tested hydraulic booster tank triggers a microswitch installed on the tooling table 2 as a reversing or stopping signal; the high-temperature pump group 8.1 and the motor pump group 72 are started; when solenoid valves 92.1 or 92.2 are de-energized and 92.3 is energized, oil enters the oil storage chamber and returns to the booster chamber of the tested hydraulic booster tank, and the tank piston rod extends; when the piston rod triggers the microswitch, the reversing is controlled by the set program, solenoid valves 92.1 and 92.2 are energized and 92.3 is de-energized, oil returns to the oil storage chamber and enters the booster chamber of the tested hydraulic booster tank, and the tank piston rod retracts; when the piston rod triggers the microswitch, the reversing is controlled by the set program, and 92.1 or 92.2 is de-energized. 92.3 When the power is applied, the oil inlet chamber of the hydraulic booster tank is filled with oil, and the oil return chamber is filled with oil. The piston rod of the tank extends, and this cycle repeats to complete the specified number of test cycles.

Claims

1. A high-temperature operating test device for a helicopter hydraulic booster tank, characterized in that: The device includes: a high-temperature hydraulic pump station, a tooling table, and a control module; The tooling table is used to fix two hydraulic booster tanks for testing. The high-temperature hydraulic pump station is used to provide the hydraulic oil source with the required pressure, temperature and flow rate for the test, and at the same time circulates the hydraulic oil in the hydraulic booster tank under test to simulate the working state on the machine. The control module is used to control the high-temperature hydraulic pump station; The high-temperature hydraulic pump station is connected to the tooling table via a control / signal cable; The high-temperature hydraulic pump station is also connected to a power cable; The oil storage chambers of the two tested hydraulic booster tanks are connected; the oil storage chambers and booster chambers of the two tested hydraulic booster tanks are respectively connected to a high-temperature hydraulic pump station through four hydraulic hoses; High-temperature hydraulic pump stations include: The quick-connect coupling panel has four hydraulic plugs, which connect to four hydraulic hoses respectively; One of the oil storage chamber outlet hydraulic plugs is divided into two passages by a solenoid valve group, which are respectively connected to the inlet of two high-temperature motor pump groups. The outlets of the two high-temperature motor pump groups are merged after passing through a check valve. A first pressure transmitter is installed at the merging point. After merging, the flow passes through a pressure oil filter, a radiator and a heating component in sequence before being connected to the other oil storage chamber return hydraulic plug. The 10MPa pressure device is connected to the hydraulic plugs of the two booster chambers respectively. The 10MPa pressure device is used to boost or depressurize the booster chambers of the hydraulic booster tank under test.

2. The apparatus according to claim 1, characterized in that: The tooling table includes: The mounting base plate serves as platform support and is installed inside the environmental chamber. Four clamp sliding guide rails are fixed parallel to each other on the mounting base plate; A set of test hydraulic booster tank fixing brackets are installed on two adjacent clamp sliding guide rails, and a test hydraulic booster tank is fixed together by a set of test hydraulic booster tank fixing brackets; The sliding guide rail with locking device is used to fix the test hydraulic booster tank mounting bracket; The mounting base plate has a micro switch sliding rail with its upper surface edge parallel to the clamp sliding rail; Two microswitches are respectively mounted on microswitch sliding rails, and the two sliding rails are equipped with locking devices to lock the two microswitches.

3. The apparatus according to claim 2, characterized in that: The high-temperature hydraulic pump station also includes a platform, which serves as a support for the pump station.

4. The apparatus according to claim 3, characterized in that: The solenoid valve assembly includes: First check valve, second check valve, first solenoid valve and second solenoid valve; The first check valve and the second check valve are connected in series, and a sealing test interface S is provided between the first check valve and the second check valve; The inlet of the first check valve is connected to the hydraulic plug of the oil storage chamber, and the outlet of the second check valve is connected to the outlet of the first solenoid valve and then connected to the high-temperature motor pump unit. The inlet of the first check valve is connected to the inlet of the first solenoid valve, and the second solenoid valve is connected in parallel with the first check valve.

5. The apparatus according to claim 4, characterized in that: An oil inlet is connected between the solenoid valve assembly and the hydraulic plug at the oil outlet of the oil reservoir, and the oil inlet is equipped with a temperature transmitter. A pressure gauge is also connected between the solenoid valve assembly and the hydraulic plug at the oil outlet of the oil reservoir. The outlet of the first solenoid valve is connected to a second pressure transmitter.

6. The apparatus according to claim 3, characterized in that: The 10MPa pressure device includes: Pressure tank, used to supply test pressure oil; The electric pump unit draws pressurized oil from the pressure oil tank; The outlet of the motor pump unit is connected to the pressure oil tank via an overflow valve; The outlet of the motor pump unit is connected to the inlet of the third check valve, and the outlet of the third check valve is connected to the hydraulic plugs of the two booster chambers. The outlet of the third check valve is also connected to the inlet of the third solenoid valve, and the outlet of the third solenoid valve is connected to the pressure oil tank.

7. A method for testing the high-temperature operation of a helicopter hydraulic booster tank, implemented based on the apparatus according to any one of claims 1-6, characterized in that: Step 1: Fixing and connecting the two hydraulic booster tanks under test; Step 2: Fill the reservoirs of the two tested hydraulic booster tanks with working fluid through the oil inlet. Step 3: Perform a sealing test at the sealing test interface S. If there is no leakage, proceed to the next step. Step 4: Start the high-temperature motor pump unit to circulate the flow; Step 5: Supply oil to the pressure chamber of the hydraulic booster tank under test through a 10MPa pressure device, so that the piston of the hydraulic booster tank under test maintains dynamic balance at the normal oil level, thereby maintaining the oil storage chamber pressure of the hydraulic booster tank under test at 0.25MPa. Step Six: Activate the heating component to heat the hydraulic oil in the reservoir of the hydraulic booster tank under test from 10℃ to the target temperature of 110℃±5℃ within 1 hour; Step 7: After reaching the target temperature, turn on the environmental chamber and conduct three rounds of cyclic testing at the specified temperature.

8. The method according to claim 7, characterized in that: During the test, when the pressure difference between the first pressure transmitter and the second pressure transmitter is less than 0.1 MPa, it is determined that the high-temperature pump set is damaged and it is switched to another high-temperature pump set.

9. The method according to claim 7, characterized in that: Set the relief valve pressure to 10 MPa.

10. The method according to claim 7, characterized in that: The method further includes: Step 8: Connect an open auxiliary oil tank to the sealing test interface S and conduct a telescoping performance test on the tested hydraulic booster oil tank under high temperature conditions; Step 9: During the test, the open auxiliary oil tank serves as the oil storage device for the high-temperature motor pump unit. When the piston rod of the hydraulic booster tank under test extends and retracts, it triggers the micro switch installed on the tooling table as a reversing or stopping signal; the high-temperature pump unit and motor pump unit are started. Step 10: When the first or second solenoid valve is energized and the third solenoid valve is de-energized, the oil storage chamber of the hydraulic booster tank under test receives oil and the booster chamber receives oil, and the piston rod of the tank extends; when the piston rod triggers the micro switch, the reversal is controlled by the set program, and the process proceeds to Step 11. Step 11: The first and second solenoid valves are simultaneously de-energized, the third solenoid valve is energized, the oil storage chamber of the tested hydraulic booster tank returns oil to the booster chamber and oil enters the tank, and the piston rod of the tank retracts; when the piston rod triggers the micro switch, the reverse direction is controlled by the set program, and the process returns to step 10. Step 12: Repeat steps 10 and 11 until the required number of cycles is reached.

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