Internal spray rotary seal test hydraulic system and leak test method

Abstract

The application discloses an internal-spray rotary sealing test hydraulic system and a leakage test method. The internal-spray rotary sealing test hydraulic system comprises a water inlet pipeline, a water outlet pipeline and an overflow pipeline. The water inlet pipeline is suitable for being connected with a water inlet of a test piece. A first pump body is arranged on the water inlet pipeline and used for supplying water to the test piece. The water outlet pipeline is suitable for being connected with a water outlet of the test piece so as to discharge water in the test piece. One end of the overflow pipeline is connected with a water outlet of the first pump body, and the overflow pipeline is used for adjusting the water supply pressure delivered to the test piece. A first control valve is arranged on the water outlet pipeline, and a first flow detection component is arranged on the water inlet pipeline and used for detecting the water amount entering the test piece when the first control valve is in an off state. The internal-spray rotary sealing test hydraulic system disclosed by the application can realize the test of internal-spray rotary sealing and is helpful to the test and improvement of sealing components.

Description

Technical Field

[0001] This invention belongs to the field of system performance testing technology, specifically relating to an internal spray rotary seal testing hydraulic system and a leakage testing method. Background Technology

[0002] According to coal mine safety regulations, when using tunneling machines, roadheader-anchor machines, or continuous mining machines for tunneling operations, internal and external spraying devices must be used. The working pressure of the internal spraying device must not be less than 2 MPa, and the working pressure of the external spraying device must not be less than 4 MPa. If the working stability of the internal and external spraying devices cannot be guaranteed, a dust suppression device that is linked and controlled with the tunneling machine, roadheader-anchor machine, or continuous mining machine should be used.

[0003] However, the lifespan of internal spray systems in tunneling equipment is generally short, and they cannot be used for long periods underground. The main reason for this is the low reliability of the rotary seals installed inside the internal spray system.

[0004] Currently, there is a lack of testing equipment for the rotary seal, a key component of the internal spray system, in China. After improvement, the internal spray system can only be tested downhole with the whole machine. This rotary seal testing method often leads to adverse consequences. On the one hand, it is difficult to replace the rotary seal of the internal spray system downhole. On the other hand, damage to the internal spray in some tunneling equipment will affect other structures. For example, if the rotary seal installed in the telescopic boom section is damaged, water will be introduced into the bearing cavity of the telescopic boom section. At best, the lubricating oil in the boom section needs to be replaced; at worst, it will cause damage to the boom section. Summary of the Invention

[0005] The present invention aims to at least partially solve one of the technical problems in the related art.

[0006] Therefore, embodiments of the present invention propose a hydraulic system for testing internal spray rotary seals, which can realize the testing of internal spray rotary seals and helps to test and improve sealing components.

[0007] Embodiments of the present invention also propose a method for testing the leakage and pressure holding of an internal spray rotary seal.

[0008] Embodiments of the present invention also propose a method for testing leakage of an internal spray rotary seal.

[0009] The internal spray rotary seal test hydraulic system according to an embodiment of the present invention includes:

[0010] A water inlet pipe is provided, which is adapted to be connected to the water inlet of the test specimen. A first pump body is provided on the water inlet pipe, which is used to supply water to the test specimen.

[0011] A water outlet pipe, which is adapted to be connected to the water outlet of the test specimen to drain water from the test specimen;

[0012] An overflow pipe, one end of which is connected to the outlet of the first pump body, is used to regulate the water supply pressure delivered to the test specimen;

[0013] The outlet pipe is equipped with a first control valve, and the inlet pipe is equipped with a first flow detection component. The first flow detection component is used to detect the amount of water entering the test specimen when the first control valve is in the open state.

[0014] The internal spray rotary seal test hydraulic system of this invention can realize the test of internal spray rotary seal, which helps to test and improve sealing components.

[0015] In some embodiments, the water inlet pipeline has a first branch and a second branch arranged in parallel. The first branch and the second branch are connected to the outlet of the first pump body. The first branch is provided with a second control valve, and the second branch is provided with a third control valve, the first flow detection component, and a first check valve. The first check valve is used to prevent the medium water in the test specimen from flowing back through the second branch.

[0016] In some embodiments, a first pipeline is further included, one end of which is connected to the outlet of the first pump body. A sixth control valve is provided on the first pipeline, and at least a portion of the medium water pumped by the first pump body is discharged from the first pipeline when the sixth control valve is turned on.

[0017] The overflow pipeline has a third branch and a fourth branch connected in parallel. A fourth control valve and a first overflow valve are provided on the third branch, and a fifth control valve and a second overflow valve are provided on the fourth branch.

[0018] In some embodiments, a second check valve is provided on the water inlet pipe, the second check valve being used to prevent water in the test specimen from flowing back through the water inlet pipe; and / or

[0019] The first control valve is a normally open solenoid valve; and / or

[0020] The second control valve is a normally closed solenoid valve; and / or

[0021] The third control valve is a normally closed solenoid valve; and / or

[0022] The fourth control valve is a normally closed solenoid valve; and / or

[0023] The fifth control valve is a normally open solenoid valve; and / or

[0024] The sixth control valve is a normally open solenoid valve; and / or

[0025] A seventh control valve is provided on the water inlet pipe, which is used to control the opening or closing of the water inlet pipe. The seventh control valve is a normally closed solenoid valve; and / or

[0026] The return water pipeline is equipped with a throttle valve; and / or

[0027] The return water pipe is equipped with a first filter; and / or

[0028] A first pressure detection component is provided at the inlet of the test specimen, and a second pressure detection component is provided at the outlet of the test specimen; and / or

[0029] A second flow detection component is provided on the first branch; and / or

[0030] The first pump body is connected to a variable frequency motor; and / or

[0031] A third flow detection component is installed on the return water pipeline.

[0032] In some embodiments, a main water tank is also included, which is used to supply medium water to the internal spray rotary seal test hydraulic system and to receive return water from the internal spray rotary seal test hydraulic system.

[0033] In some embodiments, a cooling unit is further included for cooling the medium water in the main water tank; and / or

[0034] It also includes a collection unit for collecting leaked water from the test specimen and conveying it to the main water tank; and / or

[0035] The main water tank includes a first chamber and a second chamber. The first chamber supplies water to the system, and the second chamber receives return water from the system. A partition is provided between the first chamber and the second chamber, and the water level in the first chamber and the second chamber is higher than the height of the partition; and / or

[0036] The main water tank is equipped with a first vent plug; and / or

[0037] The main water tank is equipped with a first liquid level detection component, which is used for manual observation of the water level in the main water tank; and / or

[0038] It also includes a water replenishment unit for replenishing water into the main water tank. The main water tank is equipped with a second liquid level detection component, which is a liquid level relay. The second liquid level detection component is electrically connected to the water replenishment unit and is used to detect the water level in the main water tank and control the operation of the water replenishment unit; and / or

[0039] The main water tank is equipped with a first temperature sensor; and / or

[0040] The main water tank is equipped with a vent, and an eighth control valve is installed at the vent. The eighth control valve is used to control the opening or closing of the vent; and / or

[0041] It also includes a housing, within which the internal spray rotary seal test hydraulic system is housed.

[0042] In some embodiments, when the internal spray rotary seal test hydraulic system includes a cooling unit, the cooling unit includes cooling pipes, the inlet and outlet of which are both connected to the main water tank, and the inlet and outlet of the cooling pipes are arranged at intervals. A water chiller and a second filter are connected in series on the cooling pipes, the second filter being located at the outlet of the water chiller; and / or

[0043] When the internal spray rotary seal test hydraulic system includes a collection unit, the collection unit includes a water collection tank. The water collection tank is used to collect leaked water from the test specimen. The outlet of the water collection tank is connected to the main water tank through a second pump body and a third filter. The water collection tank is equipped with a second vent plug and a third liquid level detection component. The third liquid level detection component is electrically connected to the second pump body and is used to detect the water level in the water collection tank and control the operation of the second pump body.

[0044] In some embodiments, when the internal spray rotary seal test hydraulic system includes a cooling unit, the following control methods are included in use:

[0045] Obtain the temperature of the medium water in the main water tank;

[0046] Determine whether the temperature of the medium water in the main water tank is greater than the first preset temperature threshold.

[0047] If so, the cooling unit is activated to cool the medium water in the main water tank so that the temperature of the medium water in the main water tank is lower than the second preset temperature threshold, and the cooling unit is stopped. The second preset temperature threshold is less than the first preset temperature threshold.

[0048] And / or, when the internal spray rotary seal test hydraulic system includes a collection unit, the following control methods are included in use:

[0049] Collect the leaked water from the test specimen and obtain the water volume in the collection unit;

[0050] Determine whether the water volume in the collection unit is greater than a first preset water volume threshold;

[0051] If so, the collection unit is activated to transport the water stored in the collection unit to the main water tank.

[0052] The internal spray rotary seal leakage pressure holding test method of this invention, based on the internal spray rotary seal test hydraulic system described in any of the above embodiments, performs a leakage test on the internal spray rotary seal. The internal spray rotary seal leakage pressure holding test method includes the following steps:

[0053] Water is supplied to the test specimen, and the flow rate of the medium water supplied to the test specimen is adjusted to a first preset flow rate threshold.

[0054] Prevent the water outlet of the test specimen from draining, and adjust the medium water pressure at the water inlet of the test specimen to a first preset pressure threshold.

[0055] Maintain the medium water pressure at the inlet of the test specimen at the first pressure preset threshold, and obtain the flow rate Q1 of the medium water entering the test specimen;

[0056] Determine if the flow rate Q1 is greater than the second preset threshold. If so, the internal spray rotary seal fails.

[0057] The internal spray rotary seal leakage test method of this invention, based on the internal spray rotary seal test hydraulic system described in any of the above embodiments, performs leakage testing on the internal spray rotary seal. The internal spray rotary seal leakage test method includes the following steps:

[0058] Water is supplied to the test specimen, and the flow rate of the medium water supplied to the test specimen is adjusted to a third preset flow rate threshold.

[0059] When the outlet of the test specimen is open, the pressure of the medium water flowing through the test specimen is adjusted to a second pressure preset threshold through the second overflow valve on the overflow pipe, so that the test specimen is in a simulated spray condition.

[0060] When the outlet of the test specimen is disconnected, the medium water pressure at the inlet of the test specimen is adjusted to the second preset pressure threshold through the first overflow valve in the overflow pipe so that the test specimen is in a pressure-holding condition.

[0061] The test specimen is subjected to simulated spray conditions for a duration of up to a first time preset threshold. The test specimen is then switched to a pressure holding condition, and the test specimen is subjected to pressure holding conditions for a duration of up to a second time preset threshold. The flow rate Q2 of the medium water entering the test specimen is then obtained.

[0062] Determine whether the traffic flow Q2 is greater than the second traffic flow preset threshold. If not, repeat the previous step and this step.

[0063] If so, the test ends. Attached Figure Description

[0064] Figure 1This is a schematic diagram showing the connection between the hydraulic system for the internal spray rotary seal test and the test specimen in an embodiment of the present invention.

[0065] Figure 2 This is a schematic diagram of the hydraulic system for testing the internal spray rotary seal according to an embodiment of the present invention.

[0066] Figure 3 This is a schematic diagram of the hydraulic system for internal spray rotary seal testing (with the outer shell removed) according to an embodiment of the present invention.

[0067] Figure 4 This is a schematic diagram of an internal spray rotary seal test hydraulic system (with the outer casing removed) from another perspective of an embodiment of the present invention.

[0068] Figure 5 This is an axial schematic diagram of the hydraulic system for testing the internal spray rotary seal according to an embodiment of the present invention.

[0069] Figure 6 This is a schematic diagram of the collection unit in an embodiment of the present invention.

[0070] Figure 7 This is a schematic diagram showing the connection of the hydraulic system, test specimen, and drive system for the internal spray rotary seal test according to an embodiment of the present invention.

[0071] Figure 8 This is a flow chart of the main water tank cooling process in an embodiment of the present invention.

[0072] Figure 9 This is a flowchart of the leakage water collection process in an embodiment of the present invention.

[0073] Figure 10 This is a process flow diagram of the internal spray rotary seal leakage pressure holding test method according to an embodiment of the present invention.

[0074] Figure 11 This is a process flow diagram of the internal spray rotary seal leakage test method according to an embodiment of the present invention.

[0075] Figure label:

[0076] 1. Drive system; 101. Support platform; 1011. Water collection tank; 1012. Water collection tank outlet; 102. First variable frequency motor; 103. First coupling; 104. Reducer; 105. Speed ​​and torque tester; 106. Bearing housing; 107. Torque limiter; 108. Mounting bracket; 109. Test specimen coupling;

[0077] 2. Internal spray rotary seal test hydraulic system; 20. Main water tank; 201. First chamber; 202. Second chamber; 203. First vent plug; 204. First liquid level detection component; 205. Second liquid level detection component; 206. First temperature detection component; 207. Eighth control valve; 208. Partition plate;

[0078] 21. Test unit; 211. Second variable frequency motor; 212. First pump body; 213. Fourth control valve; 214. First overflow valve; 215. Fifth control valve; 216. Second overflow valve; 217. Sixth control valve; 218. Seventh control valve; 219. Second control valve; 220. Third control valve; 221. First flow detection component; 222. First check valve; 223. Second flow detection component; 224. First pressure detection component; 225. Rotary joint; 226. Second pressure detection component; 227. First control valve; 228. Throttling valve; 229. Third flow detection component; 230. First filter; 231. Test water supply port; 232. Test water return port; 233. Test water supply hose; 234. Test water return hose; 235. Second check valve;

[0079] 24. Cooling unit; 241. Water chiller; 242. Second filter; 243. Cooling water outlet; 244. Cooling water return outlet; 245. Cooling water outlet hose; 246. Cooling water return hose;

[0080] 25. Collection unit; 251. Water collection tank; 252. Third liquid level detection component; 253. Pump station motor; 254. Second pump body; 255. Third filter; 256. Second vent plug; 257. Leakage water collection port; 258. Leakage water collection hose; 26. Outer casing;

[0081] 3. Electrical system;

[0082] 4. Control panel;

[0083] 5. Test specimen; 501. Test specimen inlet; 502. Test specimen outlet. Detailed Implementation

[0084] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0085] Combined with appendix Figure 1-7 The internal spray rotary seal test hydraulic system of the present invention will be described in detail. The internal spray rotary seal test hydraulic system is used to supply water into the test piece 5 and to perform leakage test on the internal spray rotary seal component in the test piece 5.

[0086] like Figures 1-4 As shown, the internal spray rotary seal test hydraulic system 2 includes an inlet pipe, an outlet pipe, and an overflow pipe.

[0087] One end of the inlet pipe is used to draw out the medium water, for example, it is connected to the main water tank 20. The other end of the inlet pipe is connected to the water inlet of the test specimen 5. A first pump body 212 is provided on the inlet pipe. The first pump body 212 is used to supply water to the test specimen 5. The outlet pipe is connected to the water outlet of the test specimen 5 so that the medium water at the water outlet of the test specimen 5 is discharged. When the main water tank 20 is provided, the medium water at the water outlet of the test specimen 5 flows back to the main water tank 20. One end of the overflow pipe is connected to the water outlet of the first pump body 212. The overflow pipe is used to adjust the water supply pressure delivered to the test specimen 5.

[0088] In other words, the first pump body 212 draws out the medium water and pumps it into the test piece 5 through the water inlet pipe. The medium water in the test piece 5 is discharged through the water outlet pipe. The overflow pipe is used to adjust the water supply pressure in the water inlet pipe so that the pressure of the medium water entering the test piece 5 meets the preset requirements, realizes the simulation of actual working conditions, and improves the reliability of the test performance of the sealing components.

[0089] A first control valve 227 is provided on the outlet pipe, and a first flow detection component 221 is provided on the inlet pipe. The first flow detection component 221 is used to detect the amount of water entering the test piece 5 when the first control valve 227 is in the off state. It should be understood that when conducting a leak test, the outlet pipe is disconnected to maintain pressure inside the test piece 5. When the sealing component leaks, the first flow detection component 221 can obtain the flow rate of the medium water entering the test piece 5, thereby determining whether the sealing component has failed.

[0090] The internal spray rotary seal test hydraulic system of this invention can realize the test of internal spray rotary seal, which helps to test and improve sealing components.

[0091] Optionally, the first flow detection component 221 is a flow sensor.

[0092] In some embodiments, the water inlet pipeline has a first branch and a second branch arranged in parallel. The first branch and the second branch are connected to the outlet of the first pump body 212. The first branch is provided with a second control valve 219, and the second branch is provided with a third control valve 220, a first flow detection component 221 and a first check valve 222. The first check valve 222 is used to prevent the medium water in the test specimen 5 from flowing back through the second branch.

[0093] It should be understood that the first one-way valve 222 can prevent the medium water from flowing back through the first flow detection component 221. The second control valve 219 and the third control valve 220 control the opening and closing of the first branch and the second branch, respectively. When water is supplied to the inlet 501 of the test specimen, the second control valve 219 on the first branch is opened and the third control valve 220 on the second branch is closed. When the outlet 502 of the test specimen is closed and the test specimen 5 is under pressure test, the second control valve 219 is opened and the third control valve 220 is opened. Since the first flow detection component 221 is used to detect the flow rate of leaked water in the test specimen 5, its range is small and the detection accuracy can be appropriately improved. It is not convenient for detection of large flow rates. When the outlet pipeline is open, the first branch is open and the second branch is closed.

[0094] In some embodiments, the internal spray rotary seal test hydraulic system 2 further includes a first pipeline, one end of which is connected to the outlet of the first pump body 212. A sixth control valve 217 is provided on the first pipeline, and at least a portion of the medium water pumped by the first pump body 212 flows back to the main water tank 20 through the first pipeline when the sixth control valve 217 is turned on.

[0095] The overflow pipeline has a third branch and a fourth branch connected in parallel. The third branch is equipped with a fourth control valve 213 and a first overflow valve 214, and the fourth branch is equipped with a fifth control valve 215 and a second overflow valve 216.

[0096] It should be understood that when detecting the leakage of the medium water in test specimen 5, it can be done through pressure holding test of test specimen 5 or through simulated spray test. When conducting simulated spray test, on the one hand, when the water outlet pipe is open, the water supply pressure entering the water inlet 501 of test specimen needs to reach the preset value; on the other hand, when the water outlet pipe is closed and test specimen 5 is pressure holding, the medium water pressure in the water inlet 501 of test specimen needs to reach the preset value. Therefore, by setting up the third and fourth branches, pressure adjustment can be achieved when the water outlet pipe is open and when the water outlet pipe is closed.

[0097] In some embodiments, a second check valve is provided on the water inlet pipe to prevent water in the test specimen 5 from flowing back through the water inlet pipe. It should be understood that when the first pipe is open, the water supplied by the first pump body 212 flows back to the main water tank 20 through the first pipe, and the second check valve can prevent water in the test specimen 5 from flowing back out from the test specimen inlet 501.

[0098] In some embodiments, the first control valve 227, the second control valve 219, the third control valve 220, the fourth control valve, the fifth control valve 215, the sixth control valve 217, and the seventh control valve 218 in the internal spray rotary seal test hydraulic system 2 are all solenoid valves.

[0099] Furthermore, the first control valve 227 is a normally open solenoid valve; the second control valve 219 is a normally closed solenoid valve; the third control valve 220 is a normally closed solenoid valve; the fourth control valve 213 is a normally closed solenoid valve; the fifth control valve 215 is a normally open solenoid valve; the sixth control valve 217 is a normally open solenoid valve; and a seventh control valve 218 is provided on the water inlet pipe, which is used to control the opening or closing of the water inlet pipe, and the seventh control valve 218 is a normally closed solenoid valve.

[0100] In some embodiments, a throttle valve 228 is provided on the return water pipeline. When spraying simulation is performed, the throttle valve 228 can cooperate with the first overflow valve 214 or the second overflow valve 216 to adjust the pressure of the medium water flowing into the test specimen 5 when the outlet water pipeline is in the conducting state.

[0101] Furthermore, a first filter 230 is installed on the return water pipeline to filter the medium water flowing into the main water tank 20, so as to prevent impurities from flowing into the main water tank 20.

[0102] Furthermore, a first pressure detection component 224 is provided at the water inlet of the test specimen 5, and a second pressure detection component 226 is provided at the water outlet of the test specimen 5. The first pressure detection component 224 and the second pressure detection component 226 are pressure sensors used to detect the inlet and outlet water pressures of the test specimen's water inlet 501 and outlet 502, providing pressure signals for the internal spray rotary seal test hydraulic system 2.

[0103] Furthermore, a second flow detection component 223 is provided on the first branch. The second flow detection component 223 is a flow sensor. Compared with the first flow detection component 221, the second flow detection component 223 has a relatively large range and can realize the detection of large flow rates, providing the flow signal flowing into the test piece 5 for the internal spray rotary seal test hydraulic system 2.

[0104] Furthermore, a third flow detection component, which is a flow sensor, is installed on the return water pipeline to detect the flow rate on the return water pipeline.

[0105] In some embodiments, the first pump body is connected to a variable frequency motor. It should be understood that the water supply flow rate of the first pump body 212 can be adjusted by the variable frequency motor to meet the working requirements of the hydraulic system, so that the test specimen 5 can undergo leakage testing under more realistic simulated working conditions, and the test data is more reliable.

[0106] In some embodiments, the internal spray rotary seal test hydraulic system further includes a main water tank 20, which is used to supply medium water to the internal spray rotary seal test hydraulic system and receive return water from the internal spray rotary seal test hydraulic system.

[0107] In some embodiments, the internal spray rotary seal test hydraulic system 2 further includes a cooling unit 24 for cooling the medium water in the main water tank 20. It should be understood that when the temperature of the medium water in the main water tank 20 is too high, the cooling unit 24 is activated to cool the medium water in the main water tank 20.

[0108] Optionally, the main water tank 20 includes a first chamber 201 and a second chamber 202. The first chamber 201 supplies water to the system, and the second chamber 202 receives system return water. A partition 208 is provided between the first chamber 201 and the second chamber 202. The water level in the first chamber 201 and the second chamber 202 is higher than the height of the partition 208. The cooling unit 24 is connected to the second chamber 202. On the one hand, the second chamber 202 can settle impurities in the return water, preventing impurities from entering the water intake chamber; on the other hand, it avoids the rapid exchange of hot water from the return water with the water in the entire tank, reducing the rate of temperature rise in the main water tank 20.

[0109] Optionally, the cooling unit 24 includes a cooling pipe, the inlet and outlet of which are connected to the main water tank 20, and the inlet and outlet of the cooling pipe are arranged at intervals. A water chiller 241 and a second filter 242 are connected in series on the cooling pipe, and the second filter 242 is located at the outlet of the water chiller 241.

[0110] After the internal spray rotary seal test hydraulic system 2 has been working for a period of time, the water temperature in the main water tank 20 rises. The water temperature in the main water tank 20 is detected by the first temperature detection component 206. When the water temperature exceeds a certain value, the water chiller 241 starts automatically. The second filter 242 can filter impurities in the medium water while cooling it. When the water temperature is lower than a certain value, the water chiller 241 stops automatically.

[0111] like Figure 8 As shown, in some embodiments, when the medium water in the main water tank is cooled down by the cooling unit, the following control methods are included:

[0112] S101. Obtain the temperature of the medium water in the main water tank.

[0113] S102. Determine whether the temperature of the medium water in the main water tank is greater than the first preset temperature threshold.

[0114] S103. If so, the cooling unit is started to cool the medium water in the main water tank so that the temperature of the medium water in the main water tank is lower than the second preset temperature threshold, and the cooling unit is stopped. The second preset temperature threshold is less than the first preset temperature threshold.

[0115] In some embodiments, the hydraulic system for the internal spray rotary seal test further includes a collection unit 25, which collects leaked water from the test specimen 5 and delivers it to the main water tank 20. It should be understood that by setting up components such as a water collection tank 1011 to collect leaked medium water, in order to prevent the leaked medium water from damaging or contaminating surrounding equipment, the medium water can be returned to the main water tank 20 via the collection unit 25.

[0116] Optionally, the collection unit 25 includes a water collection tank 251, which collects leaked water from the test specimen. The outlet of the water collection tank 251 is connected to the main water tank 20 through a second pump body 254 and a third filter 255. The water collection tank 251 is provided with a second vent plug 256 and a third liquid level detection component 252. The third liquid level detection component 252 is electrically connected to the second pump body 254 and is used to detect the water level in the water collection tank 251 and control the operation of the second pump body 254.

[0117] It should be understood that the water collection tank is set up to collect the leaked water from the test specimen. The top of the water collection tank 251 is lower than the outlet of the water collection tank 1011, so that the medium water in the water collection tank 1011 can flow into the water collection tank 251 under its own weight. When the third liquid level detection component 252 detects that the water in the water collection tank 251 has reached a certain amount, the second pump body 254 is started to pump the water in the water collection tank 251 to the main water tank 20. At the same time, the third filter 255 can filter the water delivered to the main water tank 20.

[0118] like Figure 9 As shown, in some embodiments, when collecting leaked water through a collection unit, the following control methods are included in the use of the hydraulic system for the internal spray rotary seal test, where the collection unit is included:

[0119] S201. Collect the leaked water from the test specimen and obtain the amount of water stored in the collection unit.

[0120] S202. Determine whether the water volume in the collection unit is greater than the first preset water volume threshold.

[0121] S203. If so, start the collection unit to transport the water stored in the collection unit to the main water tank.

[0122] In some embodiments, the main water tank 20 is provided with a first vent plug 203. The main water tank 20 can be a sealed water tank to prevent the medium water from being contaminated. The first vent plug 203 can ensure the stability of the air pressure inside the main water tank 20 and ensure the stable operation of the internal spray rotary sealing test hydraulic system 2.

[0123] Furthermore, the main water tank 20 is equipped with a first liquid level detection component 204, through which the water level in the main water tank 20 can be observed manually. The first detection component is a liquid level gauge.

[0124] Furthermore, the internal spray rotary seal test hydraulic system 2 also includes a water replenishment unit, which is used to replenish water into the main water tank 20. The main water tank 20 is equipped with a second liquid level detection component 205, which is a liquid level relay. The second liquid level detection component 205 is electrically connected to the water replenishment unit and is used to detect the water level in the main water tank 20 and control the operation of the water replenishment unit. It should be understood that since the internal spray rotary seal test hydraulic system 2 will cause medium water loss during operation, if the water level in the main water tank 20 is insufficient, causing the first pump body 212 to suck dry, it will affect the operation of the test system.

[0125] The water replenishment unit includes an inlet pipe and a solenoid valve installed on the inlet pipe. A level relay is connected to the solenoid valve. When there is a water shortage, the level relay sends a water replenishment signal and turns on the solenoid valve. When the liquid level in the main water tank 20 reaches the set liquid level, the level relay sends a disconnect signal and turns off the solenoid valve.

[0126] Furthermore, the main water tank 20 is equipped with a first temperature detection component 206, which is a temperature sensor used to detect the water temperature inside the main water tank 20, preventing the water temperature inside the main water tank 20 from becoming too high and affecting the operation of the testing system. When the water temperature inside the main water tank 20 is too high, it can be adjusted manually or by setting up a cooling unit 24.

[0127] Furthermore, the main water tank 20 is equipped with a vent, and an eighth control valve 207 is installed at the vent. The eighth control valve 207 is used to control the opening or closing of the vent. It should be understood that when cleaning or other maintenance work is required on the main water tank 20, the eighth control valve 207 can be opened to drain the medium water in the main water tank 20.

[0128] like Figure 5 As shown, in some embodiments, the internal spray rotary seal test hydraulic system 2 also includes a housing 26. The internal spray rotary seal test hydraulic system 2 is disposed inside the housing 26, which can protect the internal spray rotary seal test hydraulic system 2, prevent the internal components from being interfered with by the external environment, and improve the service life of the components.

[0129] The following is in conjunction with the appendix Figure 1 -Appendix Figure 7 The structural diagram and schematic diagram shown below provide a detailed description of the internal spray rotary seal testing hydraulic system of this invention embodiment:

[0130] Settings such as Figure 7The drive system, hydraulic system, electrical system, and control panel are shown.

[0131] The drive system is used to drive the test specimen to rotate, so that the drive shaft of the test specimen is tested during rotation. The first variable frequency motor 102, reducer 104, speed and torque tester 105, bearing housing 106, and mounting bracket 108 are directly or indirectly mounted on the support platform 101. The first variable frequency motor 102, reducer 104, speed and torque tester 105, bearing housing 106, and torque limiter 107 are connected together by the first coupling 103. The torque limiter 107 is connected to the test specimen 5 through the test specimen coupling 109, specifically to the drive shaft of the test specimen 5. The test specimen 5 is connected to the mounting bracket 108 by bolts, etc. Specifically, the shell of the test specimen 5 is connected to the mounting bracket 108. The shell of the test specimen 5 remains stationary relative to the support platform, and the drive shaft of the test specimen 5 rotates relative to the shell of the test specimen 5. A rotary seal is installed between the shell of the test specimen 5 and the drive shaft. The output shaft of the first variable frequency motor 102 is ultimately connected to the drive shaft of the test piece 5 through the reducer 104, so that the first variable frequency motor 102 can drive the drive shaft of the test piece 5 to rotate. The speed and torque tester 105 is used to measure the speed and torque of the test piece 5. When the rotational torque of the test piece 5 is too large, the torque limiter 107 will disconnect the connection between the first variable frequency motor 102, the reducer 104 and the test piece 5 in time to prevent the first variable frequency motor 102 from being damaged. The test piece inlet 501 is located in the shell of the test piece 5, and the test piece outlet 502 is located in the drive shaft of the test piece 5.

[0132] The internal spray rotary seal test hydraulic system 2 includes a main water tank 20, a test unit 21, a cooling unit 24, a collection unit 25, and a housing 26.

[0133] The main water tank 20 includes a first chamber 201, a second chamber 202, a first vent plug 203, a first liquid level detection component 204, a second liquid level detection component 205, a first temperature detection component 206, an eighth control valve 207, and a partition 208. The first chamber 201, the second chamber 202, and the partition 208 form the main structure of the water tank. The first vent plug 203 is installed above the main water tank 20. The partition 208 is installed between the first chamber 201 and the second chamber 202. On the one hand, the second chamber 202 can settle impurities in the return water to prevent impurities from entering the water suction chamber; on the other hand, it avoids the rapid exchange of hot water from the return water with the water in the entire water tank, thus preventing the temperature of the main water tank 20 from rising. The first liquid level detection component 204 is installed on one side of the main water tank 20 for manual observation of the liquid level in the main water tank; the second liquid level detection component 205 is installed above the main water tank 20 for automatic detection of the liquid level in the main water tank 20, automatic reminder to replenish water, preventing the main water tank 20 from operating without water, and avoiding the first pump body 212 from being sucked into the air; the first temperature detection component 206 is installed on one side of the main water tank 20 for detecting the temperature of the medium water in the main water tank 20. When the temperature of the main water tank 20 is high, the cooling unit 24 works, and the main water tank 20 begins to cool down; the eighth control valve 207 is installed at the bottom of the main water tank 20, and there are at least two of them, installed at the bottom of the first chamber 201 and the bottom of the second chamber 202 respectively. When the main water tank 20 needs to be replaced, the eighth control valve 207 opens to drain the water in the first chamber 201 and the second chamber 202.

[0134] The test unit 21 includes a second variable frequency motor 211, a first pump body 212, a fourth control valve 213, a first overflow valve 214, a fifth control valve 215, a second overflow valve 216, a sixth control valve 217, a seventh control valve 218, a second control valve 219, a third control valve 220, a first flow detection component 221, a first check valve 222, a second flow detection component 223, a first pressure detection component 224, a rotary joint 225, a second pressure detection component 226, a first control valve 227, a throttle valve 228, a third flow detection component 229, a first filter 230, a test water supply port 231, a test water return port 232, a test water supply hose 233, and a test water return hose 234. The pump station variable frequency motor 211 is connected to the first pump body 212 via a coupling, and the pump station variable frequency motor 211 drives the first pump body 212 to work. The suction port of the first pump body 212 is connected to the first chamber 201 of the main water tank 20 via a rubber hose. The outlet of the first pump body 212 is connected to one end of the fourth control valve 213, the fifth control valve 215, the sixth control valve 217, and the seventh control valve 218, respectively. The fourth control valve 213 is normally closed (open), the fifth control valve 215 is normally open (connected), the sixth control valve 217 is normally open (connected), and the seventh control valve 218 is normally closed (open).The other end of the fourth control valve 213 is connected to the first overflow valve 214. The outlet of the first overflow valve 214 is connected to the second chamber 202 of the main water tank 20. The opening and closing of the fourth control valve 213 controls the opening and closing of the first overflow valve 214. When the fourth control valve 213 is energized, the first overflow valve 214 starts; when the fourth control valve 213 is de-energized, the first overflow valve 214 stops working. The other end of the fifth control valve 215 is connected to the second overflow valve 216. The outlet of the second overflow valve 216 is connected to the second chamber 202 of the main water tank 20. 2. When the fifth control valve 215 is energized, the first overflow valve 214 stops working; when the fifth control valve 215 is de-energized, the second overflow valve 216 starts. The other end of the sixth control valve 217 is directly connected to the second chamber 202 of the main water tank 20 via a pipeline. When the sixth control valve 217 is de-energized, the medium water flows back to the second chamber 202 of the main water tank 20 through the sixth control valve 217; when the sixth control valve 217 is energized, the medium water does not flow through the sixth control valve 217. The seventh control valve 218 is the main inlet valve for the entire test unit 21. When the seventh control valve 218 is energized, the main water inlet switch opens, and the medium water flows to the test piece 5; when the seventh control valve 218 is de-energized, the main water inlet switch closes, the medium water is blocked, and it will not flow to the test piece; the outlet of the other end of the seventh control valve 218 is divided into two paths, and the two paths are connected in parallel. One path is connected to the first pressure detection component 224 via the second control valve 219 and the second flow detection component 223. The second control valve 219 is normally open (connected), and the second flow detection component 223... 3 is used to measure the flow rate at the inlet of the test specimen 5, and the first pressure detection component 224 is used to measure the pressure at the inlet of the test specimen 5; another path is connected to the first pressure detection component 224 via the third control valve 220, the first flow detection component 221, and the first check valve 222. The third control valve 220 is normally closed (open state), the first check valve 222 is used to prevent the medium water from flowing back to the first flow detection component 221, and the first flow detection component 221 is used to measure the leakage of the test specimen, with a small range. The first pressure detection component 224 is connected to the test water supply port 231 via an integrated valve block. The test water supply port 231 is connected to the test inlet 501 of the test specimen 5 via a test water supply hose 233. At the same time, the test outlet 502 of the test specimen 5 is connected to the test return port 232 via a rotary joint 225 and a test return hose 234. The test return port 232 is connected to the second chamber 202 of the main water tank 20 via the second pressure detection component 226, the first control valve 227, the throttle valve 228, the third flow detection component 229, and the first filter 230. The second pressure detection component 226 is used to measure the pressure at the outlet of the test specimen 5. The first control valve 227 is normally open (connected). The throttle valve 228 is used to adjust the pressure of the total circuit of the test unit 21. The third flow detection component 229 is used to measure the flow rate at the outlet of the test specimen 5.

[0135] The cooling unit 24 includes a water chiller 241, a second filter 242, a cooling water outlet 243, a cooling water return outlet 244, a cooling water outlet hose 245, and a cooling water return hose 246. The water inlet of the water chiller 241 is connected to the main water tank 20 via the cooling water outlet 243 and the cooling water outlet hose 245, and the water outlet of the water chiller 241 is connected to the main water tank 20 via the cooling water return outlet 244, the cooling water return hose 246, and the second filter 242.

[0136] The collection unit 25 includes a water collection tank 251, a third liquid level detection component 252, a pump station motor 253, a second pump body 254, a third filter 255, a second vent plug 256, a leakage water collection port 257, and a leakage water collection hose 258. The third liquid level detection component 252 and the second vent plug 256 are installed above the water collection tank 251. The third liquid level detection component 252 is used to detect the liquid level in the water collection tank 251. The pump station motor 253 is connected to the second pump body via a coupling, and the pump station motor 253 drives the second pump body to operate. The inlet of the second pump body 254 is connected to the water collection tank 251, and the outlet of the second pump body 254 is connected to the main water tank 20 via the third filter 255. A leakage water collection port 257 is located at a higher point on one side of the water collection tank 251. 57. The leakage water collection hose 258 is connected to the water collection tank outlet 1012 of the support platform 101, and the water collection tank outlet 1012 is connected to the water collection tank 1011. The leakage water in the water collection tank 1011 flows to the water collection box 251 through the water collection tank outlet 1012, the leakage water collection hose 258, and the leakage water collection port 257. At the same time, it is required to ensure that the bottom of the water collection tank outlet 1012 of the support platform 101 is at a height h1 from the ground, which is greater than the top of the water collection box 251 is at a height h2 from the ground.

[0137] Electrical system 3 includes a first frequency converter and a second frequency converter. The first frequency converter controls the first variable frequency motor 102 by adjusting its frequency parameters to change the speed of the first variable frequency motor 102, so that the adjusted speed meets the test speed requirements. The second frequency converter controls the second variable frequency motor 211 by adjusting its frequency parameters to change the speed of the second variable frequency motor 211. The second variable frequency motor 211 drives the first pump body 212, ultimately adjusting the flow rate at the outlet of the first pump body so that the adjusted speed meets the test requirements.

[0138] Control panel 4 is used to operate the entire test bench.

[0139] Test specimen 5 includes test specimen inlet 501 and test specimen outlet 502.

[0140] like Figure 10As shown, the internal spray rotary seal leakage pressure holding test method of this invention performs leakage testing of the internal spray rotary seal based on the internal spray rotary seal test hydraulic system described in any of the above embodiments. The internal spray rotary seal leakage pressure holding test method includes the following steps:

[0141] S301. Water is supplied to the test specimen, and the flow rate of the medium water supplied to the test specimen is adjusted to a first preset flow rate threshold. It should be understood that, since an internal spray rotational seal test of the test specimen is required, the effectiveness of the seal needs to be ensured during tunneling operations of tunneling machines, tunneling and anchoring machines, and continuous coal mining machines. Therefore, during the test, the drive shaft of the test specimen needs to maintain a certain rotation speed to simulate the actual working conditions as much as possible. It should also be understood that the seal test can also be performed when the test specimen is in a static state.

[0142] S302, Prevent the water outlet of the test specimen from draining, and adjust the medium water pressure at the water inlet of the test specimen to a first pressure preset threshold.

[0143] S303. Maintain the medium water pressure at the inlet of the test specimen at the first pressure preset threshold, and obtain the flow rate Q1 of the medium water entering the test specimen.

[0144] S304. Determine whether the flow rate Q1 is greater than the second flow rate preset threshold. If so, the internal spray rotary seal fails.

[0145] like Figure 11 As shown, the internal spray rotary seal leakage test method of this invention performs leakage testing on the internal spray rotary seal based on the internal spray rotary seal test hydraulic system described in any of the above embodiments. The internal spray rotary seal leakage test method includes the following steps:

[0146] S401. Water is supplied to the test specimen, and the flow rate of the medium water supplied to the test specimen is adjusted to the third preset flow rate threshold. It should be understood that, since an internal spray rotational seal test of the test specimen is required, the effectiveness of the seal needs to be ensured during the tunneling operations of the tunneling machine, tunneling and anchoring machine, and continuous coal mining machine. Therefore, during the test, the drive shaft of the test specimen needs to maintain a certain rotation speed to simulate the actual working conditions as much as possible. It should also be understood that the seal test can also be performed when the test specimen is in a static state.

[0147] S402. When the outlet of the test specimen is open, the pressure of the medium water flowing through the test specimen is adjusted to a second pressure preset threshold through the second overflow valve on the overflow pipe, so that the test specimen is in a simulated spray condition.

[0148] S403. When the outlet of the test specimen is disconnected, the medium water pressure at the inlet of the test specimen is adjusted to the second preset pressure threshold through the first overflow valve in the overflow pipe, so that the test specimen is in a pressure-holding condition.

[0149] S404. The duration of the test specimen under simulated spray conditions is increased to a first time preset threshold. The test specimen is switched to pressure holding condition, and the duration of the test specimen under pressure holding condition is increased to a second time preset threshold. The flow rate Q2 of the medium water entering the test specimen is obtained.

[0150] S405. Determine whether the flow rate Q2 is greater than the second flow rate preset threshold. If not, repeat the previous step and this step.

[0151] S406. If yes, the test ends.

[0152] The following combination Figures 1-7 Detailed description of the test method for the internal spray rotary seal test hydraulic system 2 in the above embodiment:

[0153] The failure of the rotary seal in an internal spray system is mainly manifested in leakage. When the leakage rate per unit time (per minute) exceeds a certain value, the rotary seal of the internal spray system is considered to have failed. This invention provides two methods for testing the leakage rate.

[0154] The first testing method is: pressure holding test.

[0155] The performance of the rotary sealing device was tested under a certain rotational speed N1 and a certain water pressure P1.

[0156] Start the first frequency converter and the first frequency conversion motor 102. Adjust the speed of the frequency conversion motor 102 by adjusting the frequency parameters of the first frequency converter. Through the speed change of the reducer 104, the transmission shaft in the test piece 5 rotates relative to the shell at a certain speed N1.

[0157] The second frequency converter and the second frequency conversion motor 211 are started. The throttle valve 228 is fully open. The second frequency conversion motor 211 drives the first pump body 212 to start drawing water from the main water tank 20. The seventh control valve 218 is energized and connected. The medium water flows into the test specimen inlet 501 through the second flow detection component 223 and the first pressure detection component 224. The sixth control valve 217 is energized and disconnected. The speed of the pump station frequency conversion motor 211 is adjusted by adjusting the frequency parameters of the second frequency converter, which ultimately regulates the flow rate at the outlet of the first pump body. Next, the first control valve 227 is energized and disconnected. At this time, the medium water cannot flow back to the main water tank 20 through the test specimen outlet 502. The pressure of the medium water entering the test specimen inlet 501 is adjusted by manually adjusting the second overflow valve 216 to adjust the water pressure to the test pressure P1. At this time, the system is in a pressure-holding state. When the second control valve 219 is de-energized and disconnected, the third control valve 220 is energized and connected. The medium water flows into the inlet 501 of the test piece through the first flow detection component 221 and the first pressure detection component 224. At this time, the leakage is detected by the first flow detection component 221. When the leakage water flow exceeds the set value FW1, the test ends and the internal spray rotary seal fails.

[0158] The second testing method is: simulated spray detection method.

[0159] 1) Preparatory work before testing

[0160] Start the first frequency converter and the first frequency conversion motor 102. Adjust the speed of the frequency conversion motor 102 by adjusting the frequency parameters of the first frequency converter. Through the speed change of the reducer 104, the transmission shaft in the test piece 5 rotates relative to the shell at a certain speed N1.

[0161] The second frequency converter and the second frequency conversion motor 211 are started. The throttle valve 228 is fully open. The second frequency conversion motor 211 drives the first pump body 212 to start drawing water from the main water tank 20. The seventh control valve 218 is energized and turned on. The medium water flows into the inlet 501 of the test piece through the second flow detection component 223 and the first pressure detection component 224. The sixth control valve 217 is energized and turned off. The speed of the pump station frequency conversion motor 211 is adjusted by adjusting the frequency parameters of the second frequency converter, which ultimately achieves the adjustment of the flow rate at the outlet of the first pump body. The pressure of the medium water flowing through the test piece 5 is adjusted to P2 by manually adjusting the second overflow valve 216 and the throttle valve 228.

[0162] The first control valve 227 is energized and then de-energized, entering a pressure-holding state. The sixth control valve 217 is de-energized and then energized. After a certain delay of TM1, the fourth control valve 213 and the fifth control valve 215 are energized. The fourth control valve 213 is energized and the fifth control valve 215 is de-energized. Then the sixth control valve 217 is energized and de-energized. The pressure of the medium water flowing through the test piece 5 is also adjusted to P2 by manually adjusting the first overflow valve 214.

[0163] The sixth control valve 217 is de-energized and then turned on. After a certain delay of TM1, the first control valve 227 is de-energized and then turned on. Subsequently, the fourth control valve 213 and the fifth control valve 215 are de-energized, the fourth control valve 213 is turned off, and the fifth control valve 215 is turned on. Then, the sixth control valve 217 is energized and then turned off. At this time, the medium water flows through the test piece 5 at a certain pressure P2 and then flows back to the main water tank 20. At this time, it is in the simulated spray state.

[0164] 2) Leakage measurement

[0165] After the simulated spray operation lasts for a certain period of time (TM2), the sixth control valve 217 is de-energized and then energized again. This energizes the first control valve 227, causing it to de-energize and enter a pressure-holding state. The fourth and fifth control valves 213 and 215 are then energized, with the fourth valve 213 energized and the fifth valve 215 de-energized. The sixth control valve 217 is then energized and de-energized. The second control valve 219 is de-energized and de-energized, while the third control valve 220 is energized and energized. At this point, the first flow detection component 221 detects leakage for a certain period (TM3). If the detected leakage water flow exceeds the set value (FW1), the detection ends, and the internal spray rotary seal fails.

[0166] 3) Simulated spraying

[0167] When the leakage water flow does not exceed the set value FW1 during the leakage detection period of a certain time TM3, the sixth control valve 217 is de-energized and turned on. After a certain delay of TM1, the first control valve 227 is de-energized and turned on. Then, the fourth control valve 213 and the fifth control valve 215 are de-energized, the fourth control valve 213 is turned off, and the fifth control valve 215 is turned on. Then, the sixth control valve 217 is energized and turned off. At this time, it is in the simulated spray state.

[0168] 4) Cyclic operation

[0169] Repeat steps 2) and 3) until the detection time is reached or the leakage water flow exceeds the set value FW1, at which point the detection ends.

[0170] During the cooling process of the main water tank, the cooling process is as follows:

[0171] After the test unit 21 operates for a period of time, the water temperature in the main water tank 20 will inevitably rise. The first temperature detection component 206 monitors the water temperature in the main water tank 20 in real time. When the water temperature exceeds the set value A1, the water chiller 241 automatically starts. One end of the water chiller 241 draws water into the water chiller 241 through the cooling outlet 243 and the cooling water hose 245. After being cooled by the water chiller 241, the water flows back to the main water tank 20 through the cooling water hose 245 and the cooling water return port 244. The system collects data from the first temperature detection component 206 at a certain sampling frequency. When the detected water temperature is lower than the set value A2, the water chiller 241 stops working, and A2... <A1。

[0172] The process of collecting leaked water from the test specimen includes:

[0173] When a leak is detected in the test specimen, it indicates that the rotary seal has worn to a certain extent. The leaked water will flow into the water collection tank 1011 of the support platform 101 through the water leakage hole of the test specimen 5. The leaked water flows into the water collection tank 251 through the height difference via the water collection tank 1011, the water collection tank outlet 1012, the leaked water collection hose 258, and the leaked water collection port 257. The third liquid level detection component 252 monitors the height of the leaked water in real time. When the leaked water level is detected to be higher than LV1, the pump station motor 253 starts and drives the second pump body 254 to work, pumping the leaked water from the water collection tank 251 into the main water tank 20 after passing through the third filter 255. When the leaked water level is detected to be lower than LV2, the pump station motor stops working, where LV1>LV2.

[0174] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0175] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0176] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0177] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0178] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0179] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A hydraulic system for testing internal spray rotary seals, characterized in that, include: A water inlet pipe is provided, which is adapted to be connected to the water inlet of the test specimen. A first pump body is provided on the water inlet pipe, which is used to supply water to the test specimen. A water outlet pipe, which is adapted to be connected to the water outlet of the test specimen to drain water from the test specimen; An overflow pipe, one end of which is connected to the outlet of the first pump body, is used to regulate the water supply pressure delivered to the test specimen; The water outlet pipe is equipped with a first control valve, and the water inlet pipe is equipped with a first flow detection component. The first flow detection component is used to detect the amount of water entering the test specimen when the first control valve is in the open state. The water inlet pipeline has a first branch and a second branch arranged in parallel. The first branch and the second branch are connected to the outlet of the first pump body. The first branch is provided with a second control valve, and the second branch is provided with a third control valve, the first flow detection component and a first check valve. The first check valve is used to prevent the medium water in the test piece from flowing back through the second branch. A first pipeline, one end of which is connected to the outlet of the first pump body, is provided with a sixth control valve, and at least a portion of the medium water pumped by the first pump body is discharged from the first pipeline when the sixth control valve is turned on. The overflow pipeline has a third branch and a fourth branch connected in parallel. A fourth control valve and a first overflow valve are provided on the third branch, and a fifth control valve and a second overflow valve are provided on the fourth branch.

2. The internal spray rotary seal testing hydraulic system according to claim 1, characterized in that, A second check valve is provided on the water inlet pipe, which is used to prevent water in the test specimen from flowing back through the water inlet pipe; and / or The first control valve is a normally open solenoid valve; and / or The second control valve is a normally closed solenoid valve; and / or The third control valve is a normally closed solenoid valve; and / or The fourth control valve is a normally closed solenoid valve; and / or The fifth control valve is a normally open solenoid valve; and / or The sixth control valve is a normally open solenoid valve; and / or A seventh control valve is provided on the water inlet pipe, which is used to control the opening or closing of the water inlet pipe. The seventh control valve is a normally closed solenoid valve; and / or The outlet pipe is equipped with a throttle valve; and / or The water outlet pipe is equipped with a first filter; and / or A first pressure detection component is provided at the inlet of the test specimen, and a second pressure detection component is provided at the outlet of the test specimen; and / or A second flow detection component is provided on the first branch; and / or The first pump body is connected to a variable frequency motor; and / or A third flow detection component is installed on the water outlet pipe.

3. The internal spray rotary seal test hydraulic system according to any one of claims 1 to 2, characterized in that, It also includes a main water tank, which is used to supply medium water to the internal spray rotary seal test hydraulic system and to receive the return water from the internal spray rotary seal test hydraulic system.

4. The internal spray rotary seal testing hydraulic system according to claim 3, characterized in that, It also includes a cooling unit for cooling the medium water in the main water tank; and / or It also includes a collection unit for collecting leaked water from the test specimen and transporting it to the main water tank; and / or The main water tank includes a first chamber and a second chamber. The first chamber supplies water to the system, and the second chamber receives return water from the system. A partition is provided between the first chamber and the second chamber, and the water level in the first chamber and the second chamber is higher than the height of the partition; and / or The main water tank is equipped with a first vent plug; and / or The main water tank is equipped with a first liquid level detection component, which is used for manual observation of the water level in the main water tank; and / or It also includes a water replenishment unit for replenishing water into the main water tank. The main water tank is equipped with a second liquid level detection component, which is a liquid level relay. The second liquid level detection component is electrically connected to the water replenishment unit and is used to detect the water level in the main water tank and control the operation of the water replenishment unit; and / or The main water tank is equipped with a first temperature sensor; and / or The main water tank is equipped with a vent, and an eighth control valve is installed at the vent. The eighth control valve is used to control the opening or closing of the vent; and / or It also includes a housing, within which the internal spray rotary seal test hydraulic system is housed.

5. The internal spray rotary seal testing hydraulic system according to claim 4, characterized in that, When the internal spray rotary seal test hydraulic system includes a cooling unit, the cooling unit includes cooling pipes. Both the inlet and outlet of the cooling pipes are connected to the main water tank, and the inlet and outlet of the cooling pipes are spaced apart. A water chiller and a second filter are connected in series on the cooling pipes, with the second filter located at the outlet of the water chiller; and / or When the internal spray rotary seal test hydraulic system includes a collection unit, the collection unit includes a water collection tank. The water collection tank is used to collect leaked water from the test specimen. The outlet of the water collection tank is connected to the main water tank through a second pump body and a third filter. The water collection tank is equipped with a second vent plug and a third liquid level detection component. The third liquid level detection component is electrically connected to the second pump body and is used to detect the water level in the water collection tank and control the operation of the second pump body.

6. The internal spray rotary seal testing hydraulic system according to claim 5, characterized in that, When the internal spray rotary seal test hydraulic system includes a cooling unit, the following control methods are included in its use: Obtain the temperature of the medium water in the main water tank; Determine whether the temperature of the medium water in the main water tank is greater than the first preset temperature threshold. If so, the cooling unit is activated to cool the medium water in the main water tank so that the temperature of the medium water in the main water tank is lower than the second preset temperature threshold, and the cooling unit is stopped. The second preset temperature threshold is less than the first preset temperature threshold. And / or, when the internal spray rotary seal test hydraulic system includes a collection unit, the following control methods are included in use: Collect the leaked water from the test specimen and obtain the water volume in the collection unit; Determine whether the water volume in the collection unit is greater than a first preset water volume threshold; If so, the collection unit is activated to transport the water stored in the collection unit to the main water tank.

7. A method for testing leakage and pressure holding of an internal spray rotary seal, characterized in that, The leakage test of the internal spray rotary seal is performed based on the internal spray rotary seal test hydraulic system according to any one of claims 1 to 6. The internal spray rotary seal leakage pressure holding test method includes the following steps: Water is supplied to the test specimen, and the flow rate of the medium water supplied to the test specimen is adjusted to a first preset flow rate threshold. Prevent the water outlet of the test specimen from draining, and adjust the medium water pressure at the water inlet of the test specimen to a first preset pressure threshold. Maintain the medium water pressure at the inlet of the test specimen at the first pressure preset threshold, and obtain the flow rate Q1 of the medium water entering the test specimen; Determine if the flow rate Q1 is greater than the second preset threshold. If so, the internal spray rotary seal fails.

8. A method for testing leakage of an internal spray rotary seal, characterized in that, The leakage test of the internal spray rotary seal is performed based on the internal spray rotary seal test hydraulic system according to any one of claims 1 to 6, and the internal spray rotary seal leakage test method includes the following steps: Water is supplied to the test specimen, and the flow rate of the medium water supplied to the test specimen is adjusted to a third preset flow rate threshold. When the outlet of the test specimen is open, the pressure of the medium water flowing through the test specimen is adjusted to a second pressure preset threshold through the second overflow valve on the overflow pipeline, so that the test specimen is in a simulated spray condition. When the outlet of the test specimen is disconnected, the medium water pressure at the inlet of the test specimen is adjusted to the second preset pressure threshold through the first overflow valve in the overflow pipeline, so that the test specimen is in a pressure-holding condition. The test specimen is subjected to simulated spray conditions for a duration of up to a first time preset threshold. The test specimen is then switched to a pressure holding condition, and the test specimen is subjected to pressure holding conditions for a duration of up to a second time preset threshold. The flow rate Q2 of the medium water entering the test specimen is then obtained. Determine whether the traffic flow Q2 is greater than the second traffic flow preset threshold. If not, repeat the previous step and this step. If so, the test ends.

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