A fully automated liquid injection testing device

Abstract

This application relates to the technical field of supporting equipment for data center liquid cooling systems, and in particular to a fully automated liquid injection testing device, including a liquid storage tank, a liquid infusion pump, a first return pipe, a first drain pipe, a vacuum pump, an electric pressure relief valve, a first electric ball valve, a second electric ball valve, a third electric ball valve, a first pressure sensor, a second pressure sensor, and a third pressure sensor. The input end of the liquid infusion pump is connected to the liquid supply port via the first supply pipe, and the output end is connected to the inlet of the product under test via the second supply pipe. The input end of the vacuum pump is connected to the outlet of the product under test via the first vent pipe, and the output end is connected to the first drain pipe via the second vent pipe. Overall, the fully automated liquid injection testing device can sequentially complete the liquid injection process, the pressure holding process, the pressure detection process, and the pressure relief process, effectively reducing the testing difficulty, improving testing efficiency, and ensuring testing accuracy.

Description

Technical Field

[0001] This application relates to the technical field of supporting equipment for data center liquid cooling systems, and in particular to a fully automated liquid injection testing device. Background Technology

[0002] With the development of technologies such as AI computing, 5G communication, and edge computing, the computing power demand of data centers is increasing dramatically. Liquid cooling technology, with its efficient thermal management advantages, is gradually becoming the mainstream approach in the industry. In high-density, high-power load environments, liquid cooling technology demonstrates superior heat dissipation performance and lower power efficiency compared to air cooling, making it a widely recognized solution in the industry. The CDU (Coolant Distribution Unit) is the core equipment in a cold-plate liquid cooling system, and its main function is to precisely distribute coolant to the cold plates in each rack.

[0003] Currently, the process involves first injecting a cooling medium into the liquid-cooled plate of the product awaiting testing, followed by a pressure holding process, then a pressure testing process, and finally a pressure release process. Each process is independent of the others.

[0004] The existing technical solutions mentioned above have the following drawbacks: the liquid injection process, the pressure holding process, the pressure detection process, and the pressure relief process are independent of each other, which increases the difficulty of testing and restricts the testing efficiency and accuracy. Summary of the Invention

[0005] To reduce testing difficulty and improve testing efficiency and accuracy, this application provides a fully automated liquid injection testing device.

[0006] This application provides a fully automated liquid injection testing device, which adopts the following technical solution: A fully automated liquid injection testing device, comprising: The liquid storage tank is used to store the cooling working fluid. It has a liquid supply port at the bottom and a first liquid return port at the top. The infusion pump has its input end connected to the inlet via a first supply pipe, and its output end connected to the inlet of the product to be tested via a second supply pipe. The first return pipe is connected at one end to the second supply pipe and at the other end to the first return port. The first drain pipe is connected at one end to the first return pipe; The vacuum pump has its input end connected to the outlet of the product to be tested via the first outlet pipe, and its output end connected to the first drain pipe via the second outlet pipe. An electric pressure relief valve is installed at the end of the first return pipe near the second supply pipe; The first electric ball valve is installed at the end of the first outlet pipe furthest from the vacuum pump; The second electric ball valve is installed at the end of the second supply pipe away from the infusion pump; The third electric ball valve is installed at the end of the second supply pipe near the infusion pump; The first pressure sensor is installed on the second liquid supply pipe and is located between the second electric ball valve and the third electric ball valve; The second pressure sensor is installed on the second liquid supply pipe and is located between the second electric ball valve and the third electric ball valve. The third pressure sensor is installed at the end of the first outlet pipe near the vacuum pump.

[0007] By adopting the above technical solution, firstly, a vacuuming mode is implemented. In vacuuming mode, the first electric ball valve is opened, while the second and third electric ball valves and the electric pressure relief valve are closed. The vacuum pump starts, extracting air from the product under test and its pipelines. When the vacuum level inside the product under test reaches the preset value, the vacuum pump stops operating. By vacuuming, a negative pressure condition is created for subsequent liquid injection, ensuring that there are no air bubbles in the cooling medium inside the product under test, improving injection accuracy, and thus contributing to improved test precision. Next, a liquid injection mode is implemented. In liquid injection mode, the second and third electric ball valves are opened, while the first electric ball valve and the electric pressure relief valve are closed. The infusion pump starts, and the delivery flow rate is adjusted by regulating the pump's speed. The pressure in the second supply pipe and inside the product under test is detected by the first and second pressure sensors. When the pressure reaches the preset value, the third electric ball valve closes. This ensures stable liquid injection into the product under test, guaranteeing that the pressure in the second supply pipe and inside the product under test reaches the preset value. Finally, a constant pressure mode is implemented. In constant pressure mode, the second and third electric ball valves are open, while the first electric ball valve and the electric pressure relief valve are closed. The infusion pump starts and runs continuously for a certain period to ensure the stability of the injection pressure. Next, a pressure holding mode is implemented. In this mode, the second electric ball valve is open, while the first, third, and electric ball valves, as well as the electric pressure relief valve, are closed. The first and second pressure sensors continuously monitor the pressure in the second supply pipe and the product under test to determine if any leakage has occurred. Finally, a pressure relief mode is implemented. In this mode, the second and electric ball valves are open, while the first and third electric ball valves are closed, allowing the cooling medium in the product under test to flow into the storage tank or to the floor drain. This release of system pressure ensures operational safety or prepares for the next step. Overall, the fully automated liquid injection testing equipment can sequentially complete the liquid injection, pressure holding, pressure detection, and pressure relief processes, effectively reducing testing difficulty, improving testing efficiency, and ensuring testing accuracy.

[0008] This application further includes: A safety valve is installed at the end of the second supply line near the infusion pump and is located between the infusion pump and the third electric ball valve; The pressure switch is installed at the end of the second supply pipe near the infusion pump and is located between the safety valve and the third electric ball valve; A one-way valve is installed at the end of the second supply pipe near the infusion pump, and is located between the pressure switch and the third electric ball valve.

[0009] By adopting the above technical solution, when the system pressure exceeds the set pressure, the safety valve opens to release pressure, preventing damage to the infusion pump. The check valve is used to control the flow direction of the cooling medium.

[0010] This application further includes: The filter is installed on the first supply line.

[0011] By adopting the above technical solution, the filter filters the coolant flowing out of the storage tank, removes impurities from the coolant, ensures the cleanliness of the coolant, prevents impurities from entering subsequent components, avoids blockage, and reduces wear on subsequent components.

[0012] This application further includes: The first oil-water separator is installed on the first vent pipe and is located between the third pressure sensor and the first electric ball valve; The second oil-water separator is installed on the second vent pipe.

[0013] By adopting the above technical solution, the first oil-water separator and the second oil-water separator can prevent water vapor in the air from mixing with lubricating oil to form an emulsion, thus avoiding lubrication failure, component corrosion and wear.

[0014] This application further includes: The first solenoid valve is installed at the end of the first return pipe near the storage tank. The second solenoid valve is installed at the end of the first drain pipe near the first return pipe.

[0015] This application further specifies that: the top of the liquid storage tank has a second return port, an overflow port, a first replenishment port, and a second replenishment port; Also includes: The second return pipe is connected at one end to the second supply pipe and at the other end to the second return port. Manual pressure relief valve, installed on the second return pipe; The overflow pipe is connected at one end to the first drain pipe and at the other end to the overflow port; An overflow valve is installed on the overflow pipe; The second drain pipe is connected at one end to the first supply pipe and at the other end to the first drain pipe. Drain valve, installed on the second drain pipe; The fluid replenishment tube is connected at one end to the first fluid replenishment port; An electric replenishment valve is installed on the replenishment pipe.

[0016] By adopting the above technical solution, when the system pressure is too high and the electric pressure relief valve fails to respond in time, the manual pressure relief valve can be operated manually to relieve pressure, ensuring the safety of equipment operation. When the liquid level in the storage tank is too high, the coolant in the storage tank flows out through the overflow port. The residual coolant in the storage tank can be discharged through the second drain pipe to facilitate maintenance and replacement of the coolant. When the liquid level in the storage tank is too low, the electric replenishment valve opens, and coolant is replenished into the storage tank through the replenishment pipe.

[0017] This application further includes: A level gauge is installed on the liquid storage tank.

[0018] This application further includes: An isolation valve is installed on the second liquid supply pipe and is located between the first pressure sensor and the second pressure sensor.

[0019] By employing the above technical solution, a two-stage pressure test is conducted in pressure-holding mode. In the first test stage, the first, second, and third electric ball valves, as well as the electric pressure relief valve, are closed, and the isolation valve is closed. The second pressure sensor monitors the pressure within the pipeline to determine if any leakage has occurred. In the second test stage, the second electric ball valve is opened, while the first, third, and electric ball valves, as well as the electric pressure relief valve, are closed. The isolation valve is opened, and the first pressure sensor monitors the pressure within the pipeline and the product under test to determine if any leakage has occurred in the product under test. This allows for precise location of the leak.

[0020] This application further includes: The first buffer tank is connected on one side to the end of the second supply pipe away from the infusion pump, and on the other side to the inlet of the product to be tested through the third supply pipe. An exhaust port is formed on the top. The fourth electric ball valve is connected to the exhaust port at one end; The exhaust pump's inlet is connected to the other end of the fourth electric ball valve; The fifth electric ball valve is installed on the third liquid supply pipe; The second buffer box is connected to the end of the first air outlet pipe away from the vacuum pump on one side, and to the outlet of the product to be tested through the third air outlet pipe on the other side. An air inlet is formed at the bottom. The sixth electric ball valve is connected to the air inlet at one end; The air compressor's outlet is connected to the other end of the sixth electric ball valve; The seventh electric ball valve is installed on the third air outlet pipe.

[0021] By adopting the above technical solution, firstly, a vacuuming mode is implemented. In vacuuming mode, the first, fifth, and seventh electric ball valves are opened, while the second, third, fourth, and sixth electric ball valves, as well as the electric pressure relief valve, are closed. The vacuum pump is started, extracting air from the interior of the product under test, the first buffer tank, the second buffer tank, and the pipeline. When the vacuum level inside the product under test reaches the preset value, the vacuum pump stops operating. By vacuuming, a negative pressure condition is created for subsequent liquid injection, ensuring that there are no air bubbles in the cooling medium inside the product under test, improving the injection accuracy, and thus contributing to improved test precision. Next, the liquid injection mode is implemented. In liquid injection mode, liquid injection is performed in two stages. In the first stage, the second, third, fifth, and seventh electric ball valves are opened, while the first, fourth, and sixth electric ball valves, as well as the electric pressure relief valve, are closed. The infusion pump is started, and the delivery flow rate is adjusted by regulating the pump's speed. In the second injection phase, firstly, the fourth electric ball valve opens, while the first, second, third, fifth, sixth, and seventh electric ball valves, along with the electric pressure relief valve, close. The exhaust pump starts, expelling residual air from the first buffer tank. Then, the second and third electric ball valves open, while the first, fourth, fifth, sixth, and seventh electric ball valves, along with the electric pressure relief valve, close. The infusion pump starts, continuing to deliver liquid into the first buffer tank. This further ensures injection accuracy and improves test precision. Next, a constant pressure mode is implemented. In this mode, the second, third, fifth, and seventh electric ball valves open, while the first, fourth, sixth, and electric pressure relief valves close. The infusion pump starts and runs continuously for a certain period to ensure stable injection pressure. Finally, a pressure-holding mode is implemented. In pressure holding mode, the second, fifth, and seventh electric ball valves are open, while the first, third, fourth, and sixth electric ball valves, as well as the electric pressure relief valve, are closed. The first and second pressure sensors continuously monitor the pressure in the second and third liquid supply pipes, the third air outlet pipe, the first and second buffer tanks, and the product under test to determine if any leaks have occurred. Finally, pressure relief mode is activated. In vacuum mode, the sixth electric ball valve can be opened appropriately, and a small amount of compressed air can be introduced into the second buffer tank, the product under test, and the first buffer tank using an air compressor to prevent excessively low negative pressure in these tanks. In pressure relief mode, the sixth electric ball valve can be opened appropriately, and compressed air can be blown into the second buffer tank, the product under test, and the first buffer tank using an air compressor to remove residual cooling medium from these tanks.Compared to vacuum drying, it is suitable for drying products with more complex internal structures.

[0022] This application further includes: The simulation component has a liquid level observation port formed on the top. The fourth supply pipe is connected at one end to the end of the second supply pipe away from the infusion pump, and at the other end to the inlet of the simulation device. The eighth electric ball valve is installed on the fourth liquid supply pipe; The fourth exhaust pipe is connected at one end to the end of the first exhaust pipe that is furthest from the vacuum pump, and at the other end to the outlet of the simulation component. The ninth electric ball valve is installed on the fourth air outlet pipe; An internal pressure sensor is installed inside the simulation component.

[0023] By adopting the above technical solution, the liquid level inside the simulated component can be observed through a sealed, transparent liquid level observation port, thereby enabling real-time monitoring of the liquid level inside the product under test. An internal pressure sensor is used to monitor the pressure inside the simulated component in real time, thus providing real-time monitoring of the pressure inside the product under test.

[0024] In summary, the beneficial technical effects of this application are as follows: 1. First, the vacuuming mode is activated. In vacuuming mode, the first electric ball valve is open, while the second and third electric ball valves and the electric pressure relief valve are closed. The vacuum pump starts, extracting air from the product under test and its piping. When the vacuum level inside the product under test reaches the preset value, the vacuum pump stops. Vacuuming creates negative pressure conditions for subsequent liquid injection, ensuring no air bubbles in the cooling medium inside the product under test, improving injection accuracy, and thus enhancing test precision. Next, the liquid injection mode is activated. In liquid injection mode, the second and third electric ball valves are open, while the first electric ball valve and the electric pressure relief valve are closed. The infusion pump starts, and the flow rate is adjusted by regulating the pump's speed. The pressure in the second supply pipe and inside the product under test is detected by the first / second pressure sensor. When the pressure reaches the preset value, the third electric ball valve closes. This ensures smooth liquid injection into the product under test, guaranteeing that the pressure in the second supply pipe and inside the product under test reaches the preset value. Finally, the constant pressure mode is activated. In constant pressure mode, the second and third electric ball valves are open, while the first electric ball valve and the electric pressure relief valve are closed. The infusion pump starts and runs continuously for a certain period to ensure the stability of the injection pressure. Next, a pressure holding mode is implemented. In this mode, the second electric ball valve is open, while the first, third, and electric ball valves, as well as the electric pressure relief valve, are closed. The first and second pressure sensors continuously monitor the pressure in the second supply pipe and the product under test to determine if any leakage has occurred. Finally, a pressure relief mode is implemented. In this mode, the second and electric ball valves are open, while the first and third electric ball valves are closed, allowing the cooling medium in the product under test to flow into the storage tank or to the floor drain. This release of system pressure ensures operational safety or prepares for the next step. Overall, the fully automated liquid injection testing equipment can sequentially complete the liquid injection, pressure holding, pressure detection, and pressure relief processes, effectively reducing testing difficulty, improving testing efficiency, and ensuring testing accuracy.

[0025] 2. In pressure-holding mode, a two-stage pressure test is performed. In the first test stage, the first, second, and third electric ball valves, as well as the electric pressure relief valve, are closed, and the isolation valve is closed. The second pressure sensor monitors the pressure within the pipeline to determine if any leakage has occurred. In the second test stage, the second electric ball valve is opened, while the first, third, and electric ball valves, as well as the electric pressure relief valve, are closed. The isolation valve is opened, and the first pressure sensor monitors the pressure within the pipeline and the product under test to determine if any leakage has occurred in the product under test. This allows for precise location of the leak.

[0026] 3. In the injection mode, the injection process is divided into two stages. In the first stage, the second, third, fifth, and seventh electric ball valves are opened, while the first, fourth, and sixth electric ball valves and the electric pressure relief valve are closed. The infusion pump starts, and the flow rate is adjusted by regulating the pump's speed. In the second stage, firstly, the fourth electric ball valve opens, while the first, second, third, fifth, sixth, and seventh electric ball valves and the electric pressure relief valve close. The air venting pump starts, expelling any residual air from the first buffer tank. Then, the second and third electric ball valves open, while the first, fourth, fifth, sixth, and seventh electric ball valves and the electric pressure relief valve close. The infusion pump continues to deliver liquid into the first buffer tank. This further ensures injection accuracy, thereby improving test precision. In vacuum mode, the sixth electric ball valve can be opened appropriately to allow a small amount of compressed air to be introduced into the second buffer tank, the product under test, and the first buffer tank using an air compressor, in order to prevent the negative pressure in these tanks from becoming too low. In depressurization mode, the sixth electric ball valve can be opened appropriately to allow compressed air to be blown into the second buffer tank, the product under test, and the first buffer tank using an air compressor, in order to remove the cooling medium remaining in these tanks. Compared to vacuum drying, this method is suitable for drying products with more complex internal structures.

[0027] 4. The liquid level inside the simulated component can be observed through a sealed, transparent liquid level observation port, thus enabling real-time monitoring of the liquid level inside the product under test. An internal pressure sensor is used to monitor the pressure inside the simulated component in real time, thereby enabling real-time monitoring of the pressure inside the product under test. Attached Figure Description

[0028] Figure 1 This is a schematic diagram illustrating the working principle of an embodiment of the fully automated liquid injection testing equipment of this application; Figure 2 This is a schematic diagram of the structure of an embodiment of the fully automated liquid injection testing equipment of this application; Figure 3 yes Figure 2 The diagram shows the internal structure of the fully automated liquid injection testing equipment. Figure 4 This is a schematic diagram of the structure of one embodiment of the liquid storage tank; Figure 5 yes Figure 4 The diagram shows a structural schematic of the liquid storage tank from another perspective. Figure 6It is a schematic diagram of the combined structure of an infusion pump, a first supply pipe, a second supply pipe, a first return pipe, a second return pipe, a first drain pipe, a second drain pipe, an electric pressure relief valve, a second electric ball valve, a third electric ball valve, a first pressure sensor, and a second pressure sensor. Figure 7 It is a schematic diagram of the combined structure of a vacuum pump, a first outlet pipe, a second outlet pipe, a first electric ball valve, a third pressure sensor, a first oil-water separator, and a second oil-water separator; Figure 8 This is a schematic diagram illustrating the working principle of another embodiment of the fully automated liquid injection testing equipment of this application; Figure 9 This is a schematic diagram illustrating the working principle of another embodiment of the fully automated liquid injection testing equipment of this application; Figure 10 This is a schematic diagram illustrating the working principle of another embodiment of the fully automated liquid injection testing equipment of this application.

[0029] Reference numerals: 110, Storage tank; 111, Supply port; 112, First return port; 113, Second return port; 114, Overflow port; 115, First replenishment port; 116, Second replenishment port; 117, Level gauge; 120, Infusion pump; 121, First supply pipe; 122, Second supply pipe; 123, Third supply pipe; 124, Fourth supply pipe; 131, First return pipe; 132, Second return pipe ; 133. Overflow pipe; 134. Replenishment pipe; 141. First drain pipe; 142. Second drain pipe; 150. Vacuum pump; 151. First vent pipe; 152. Second vent pipe; 153. Third vent pipe; 154. Fourth vent pipe; 161. Electric pressure relief valve; 162. First electric ball valve; 163. Second electric ball valve; 164. Third electric ball valve; 165. Safety valve; 166. Check valve; 1 67. First solenoid valve; 168. Second solenoid valve; 1691. Manual pressure relief valve; 1692. Overflow valve; 1693. Drain valve; 1694. Electric replenishment valve; 1695. Isolation valve; 171. First pressure sensor; 172. Second pressure sensor; 173. Third pressure sensor; 174. Pressure switch; 175. Filter; 176. First oil-water separator; 177. Second oil-water separator; 181. First buffer tank; 182. Fourth electric ball valve; 183. Exhaust pump; 184. Fifth electric ball valve; 185. Second buffer tank; 186. Sixth electric ball valve; 187. Air compressor; 188. Seventh electric ball valve; 191. Simulation component; 1911. Liquid level observation port; 192. Eighth electric ball valve; 193. Ninth electric ball valve; 194. Intracavity pressure detection sensor; 200. Product under test. Detailed Implementation

[0030] The following is in conjunction with the appendix Figure 1-10This application will be described in further detail.

[0031] Reference Figure 1 , Figure 2 and Figure 3 This application discloses a fully automated liquid injection testing device, including a liquid storage tank 110, an infusion pump 120, a first return pipe 131, a first drain pipe 141, a vacuum pump 150, an electric pressure relief valve 161, a first electric ball valve 162, a second electric ball valve 163, a third electric ball valve 164, a first pressure sensor 171, a second pressure sensor 172, and a third pressure sensor 173. The liquid storage tank 110 is used to store the cooling working fluid. Figure 4 and Figure 5 As shown, a liquid supply port 111 is formed at the bottom of the liquid storage tank 110, and a first liquid return port 112 is formed at the top of the liquid storage tank 110. Figure 6 As shown, the input end of the infusion pump 120 is connected to the supply port 111 via the first supply pipe 121, and the output end is connected to the inlet of the product under test 200 via the second supply pipe 122. The infusion pump 120 provides power for the flow of the cooling medium, propelling it through subsequent components. One end of the first return pipe 131 is connected to the second supply pipe 122, and the other end is connected to the first return port 112, so that the cooling medium in the product under test 200 can flow back to the storage tank 110. One end of the first drain pipe 141 is connected to the first return pipe 131, so that the cooling medium can be discharged to the floor drain. Figure 7As shown, the input end of the vacuum pump 150 is connected to the outlet of the product under test 200 through the first outlet pipe 151, and the output end is connected to the first drain pipe 141 through the second outlet pipe 152. This is used to evacuate the product under test 200, creating a vacuum inside. Simultaneously, residual cooling medium inside the product under test 200 can be discharged, achieving the purpose of drying the product under test 200. An electric pressure relief valve 161 is installed at the end of the first return pipe 131 near the second supply pipe 122, used to control the opening and closing of the first return pipe 131. The electric pressure relief valve 161 releases pressure when open. A first electric ball valve 162 is installed at the end of the first outlet pipe 151 away from the vacuum pump 150, used to control the opening and closing of the first outlet pipe 151. A second electric ball valve 163 is installed at the end of the second supply pipe 122 away from the infusion pump 120, used to control the opening and closing of the second supply pipe 122. The third electric ball valve 164 is installed at the end of the second supply pipe 122 near the infusion pump 120, and is used to control the opening and closing of the second supply pipe 122. The first pressure sensor 171 is installed on the second supply pipe 122, located between the second electric ball valve 163 and the third electric ball valve 164, and is used to detect the pressure within the second supply pipe 122 and the product under test 200. The second pressure sensor 172 is installed on the second supply pipe 122, located between the second electric ball valve 163 and the third electric ball valve 164, and is used to detect the pressure within the second supply pipe 122 and the product under test 200. It should be noted that when the first pressure sensor 171 is working, the second pressure sensor 172 is not working, and vice versa. The first pressure sensor 171 and the second pressure sensor 172 cooperate to achieve a one-for-one standby working mode. When one pressure sensor fails, the other pressure sensor can participate in the pressure detection task, ensuring the stability and continuity of pressure detection. The third pressure sensor 173 is installed at one end of the first outlet pipe 151 near the vacuum pump 150 and is used to detect the air pressure inside the product under test 200.

[0032] The working process and principle of the fully automated liquid injection testing equipment are as follows: First, the vacuuming mode is activated. In vacuuming mode, the first electric ball valve 162 is opened, the second electric ball valve 163, the third electric ball valve 164, and the electric pressure relief valve 161 are closed, and the vacuum pump 150 is started to extract air from the product under test 200 and its pipeline. When the vacuum level inside the product under test 200 reaches the preset value, the vacuum pump 150 stops operating. By evacuating, a negative pressure condition is created for subsequent liquid injection, ensuring that there are no air bubbles in the cooling medium inside the product under test 200, improving the injection accuracy, and thus contributing to improved test precision. Next, the liquid injection mode is activated. In liquid injection mode, the second electric ball valve 163 and the third electric ball valve 164 are opened, the first electric ball valve 162 and the electric pressure relief valve 161 are closed, and the infusion pump 120 is started. The delivery flow rate is adjusted by regulating the speed of the infusion pump 120. The pressure inside the second supply pipe 122 and the product under test 200 is detected by the first pressure sensor 171 and the second pressure sensor 172. When the pressure reaches the preset value, the third electric ball valve 164 closes. This ensures a smooth injection of liquid into the product under test 200, guaranteeing that the pressure in the second supply pipe 122 and the product under test 200 reaches the preset value. Next, a constant pressure mode is implemented. In this mode, the second and third electric ball valves 163 and 164 are open, the first electric ball valve 162 and the electric pressure relief valve 161 are closed, and the infusion pump 120 starts and runs continuously for a certain period to ensure the stability of the injection pressure. Then, a pressure holding mode is implemented. In this mode, the second electric ball valve 163 is open, and the first, third, and fourth electric ball valves 164, as well as the electric pressure relief valve 161, are closed. The first and second pressure sensors 171 and 172 continuously monitor the pressure in the second supply pipe 122 and the product under test 200 to determine if any leakage has occurred. Finally, a pressure relief mode is implemented. In pressure relief mode, the second electric ball valve 163 and the electric pressure relief valve 161 open, while the first electric ball valve 162 and the third electric ball valve 164 close, allowing the cooling medium inside the product under test 200 to flow into the storage tank 110 or towards the floor drain. Releasing the system pressure ensures operational safety or prepares for the next step. Overall, the fully automated liquid injection testing equipment sequentially completes the liquid injection, pressure holding, pressure testing, and pressure relief processes, effectively reducing testing difficulty, improving testing efficiency, and ensuring testing accuracy.

[0033] Reference Figure 1 , Figure 3 and Figure 6In one embodiment, the fully automated liquid injection testing device further includes a safety valve 165, a pressure switch 174, a check valve 166, and a filter 175. The safety valve 165 is installed at the end of the second supply pipe 122 near the infusion pump 120, and is located between the infusion pump 120 and the third electric ball valve 164. The safety valve 165 is connected to the overflow pipe 133. When the system pressure exceeds the set pressure, the safety valve 165 opens to release pressure, preventing damage to the infusion pump 120. The pressure switch 174 is installed at the end of the second supply pipe 122 near the infusion pump 120, and is located between the safety valve 165 and the third electric ball valve 164, and is used to monitor the pressure at the output end of the infusion pump 120. When the pressure at the output end of the infusion pump 120 is too high, the infusion pump 120 stops operating. A one-way valve 166 is installed on the second supply pipe 122 near the infusion pump 120, and located between the pressure switch 174 and the third electric ball valve 164, to control the flow direction of the coolant. A filter 175 is installed on the first supply pipe 121. The filter 175 filters the coolant flowing from the storage tank 110, removing impurities and ensuring the cleanliness of the coolant. This prevents impurities from entering subsequent components, avoids blockages, and reduces wear on downstream components.

[0034] Reference Figure 1 , Figure 3 and Figure 7 In one embodiment, the fully automated liquid injection testing equipment further includes a first oil-water separator 176 and a second oil-water separator 177. The first oil-water separator 176 is installed on the first vent pipe 151 and is located between the third pressure sensor 173 and the first electric ball valve 162. The second oil-water separator 177 is installed on the second vent pipe 152. The first oil-water separator 176 and the second oil-water separator 177 can prevent water vapor in the air from mixing with the lubricating oil to form an emulsion, thus avoiding lubrication failure, component corrosion, and wear.

[0035] Reference Figure 4 , Figure 5 and Figure 6In one embodiment, the top of the liquid storage tank 110 has a second return port 113, an overflow port 114, a first replenishment port 115, and a second replenishment port 116. The fully automatic liquid injection testing equipment also includes a first solenoid valve 167, a second solenoid valve 168, a second return pipe 132, a manual pressure relief valve 1691, an overflow pipe 133, an overflow valve 1692, a second drain pipe 142, a drain valve 1693, a replenishment pipe 134, an electric replenishment valve 1694, and a level gauge 117. The first solenoid valve 167 is installed at the end of the first return pipe 131 near the liquid storage tank 110 and is used to control the connection and disconnection between the first return pipe 131 and the liquid storage tank 110. The second solenoid valve 168 is installed at the end of the first drain pipe 141 near the first return pipe 131 and is used to control the connection and disconnection between the first return pipe 131 and the first drain pipe 141. When it is necessary for the cooling medium in the product under test 200 to flow back to the storage tank 110, the first solenoid valve 167 opens and the second solenoid valve 168 closes. When it is necessary for the cooling medium in the product under test 200 to flow to the floor drain, the second solenoid valve 168 opens and the first solenoid valve 167 closes. One end of the second return pipe 132 is connected to the second supply pipe 122, and the other end is connected to the second return port 113. A manual pressure relief valve 1691 is installed on the second return pipe 132 to control the opening and closing of the second return pipe 132. When the pressure in the system is too high and the electric pressure relief valve 161 does not respond in time, the manual pressure relief valve 1691 can be manually operated to relieve pressure, ensuring the safety of equipment operation. One end of the overflow pipe 133 is connected to the first drain pipe 141, and the other end is connected to the overflow port 114. An overflow valve 1692 is installed on the overflow pipe 133 to control the opening and closing of the overflow pipe 133. When the liquid level in the storage tank 110 is too high, the coolant in the storage tank 110 flows out through the overflow port 114. One end of the second drain pipe 142 is connected to the first supply pipe 121, and the other end is connected to the first drain pipe 141. A drain valve 1693 is installed on the second drain pipe 142 to control the opening and closing of the second drain pipe 142. The second drain pipe 142 can drain the residual coolant in the storage tank 110 to facilitate maintenance and replacement of the coolant. One end of the replenishment pipe 134 is connected to the first replenishment port 115. An electric replenishment valve 1694 is installed on the replenishment pipe 134 to control the opening and closing of the replenishment pipe 134. When the liquid level in the storage tank 110 is too low, the electric replenishment valve 1694 opens, replenishing the coolant into the storage tank 110 through the replenishment pipe 134. The level gauge 117 is installed on the liquid storage tank 110 to monitor the liquid level inside the liquid storage tank 110.

[0036] Preferably, such as Figure 2As shown, the fully automated liquid injection testing equipment also includes a cabinet and a controller. The cabinet houses a liquid storage tank 110, an infusion pump 120, a first supply pipe 121, a second supply pipe 122, a first return pipe 131, a second return pipe 132, an overflow pipe 133, a replenishment pipe 134, a first drain pipe 141, a second drain pipe 142, a vacuum pump 150, a first vent pipe 151, and a second vent pipe 152. The cabinet isolates the internal components from the external environment, preventing external interference with the normal operation of the equipment. The controller is mounted on the cabinet and electrically connected to the electrical components inside, used to control their operation.

[0037] Reference Figure 8 In another embodiment, the fully automated liquid injection testing equipment also includes an isolation valve 1695. The isolation valve 1695 is installed on the second liquid supply pipe 122 and located between the first pressure sensor 171 and the second pressure sensor 172. In pressure holding mode, a two-stage pressure test is performed. In the first test stage, the first electric ball valve 162, the second electric ball valve 163, the third electric ball valve 164, and the electric pressure relief valve 161 are closed, and the isolation valve 1695 is closed. The second pressure sensor 172 monitors the pressure within the pipeline to determine if a leak has occurred. In the second test stage, the second electric ball valve 163 is opened, the first electric ball valve 162, the third electric ball valve 164, and the electric pressure relief valve 161 are closed, and the isolation valve 1695 is opened. The first pressure sensor 171 monitors the pressure within the pipeline and the product under test 200 to determine if a leak has occurred in the product under test 200. This allows for precise location of the leak.

[0038] Reference Figure 9In another embodiment, the fully automated liquid injection testing equipment includes a liquid storage tank 110, an infusion pump 120, a first return pipe 131, a first drain pipe 141, a vacuum pump 150, an electric pressure relief valve 161, a first electric ball valve 162, a second electric ball valve 163, a third electric ball valve 164, a first pressure sensor 171, a second pressure sensor 172, a third pressure sensor 173, a first buffer tank 181, a fourth electric ball valve 182, an exhaust pump 183, a fifth electric ball valve 184, a second buffer tank 185, a sixth electric ball valve 186, an air compressor 187, and a seventh electric ball valve 188. A liquid supply port 111 is formed at the bottom of the liquid storage tank 110, and a first return port 112 is formed at the top of the liquid storage tank 110. The infusion pump 120 has its input end connected to the supply port 111 via the first supply pipe 121, and its output end connected to one side of the first buffer tank 181 via the second supply pipe 122. One end of the first return pipe 131 is connected to the second supply pipe 122, and the other end is connected to the first return port 112. One end of the first drain pipe 141 is connected to the first return pipe 131. The vacuum pump 150 has its input end connected to one side of the second buffer tank 185 via the first vent pipe 151, and its output end connected to the first drain pipe 141 via the second vent pipe 152. An electric pressure relief valve 161 is installed on the end of the first return pipe 131 near the second supply pipe 122. A first electric ball valve 162 is installed on the end of the first vent pipe 151 away from the vacuum pump 150. A second electric ball valve 163 is installed on the end of the second supply pipe 122 away from the infusion pump 120. The third electric ball valve 164 is installed at the end of the second supply pipe 122 near the infusion pump 120. The first pressure sensor 171 is installed on the second supply pipe 122, located between the second electric ball valve 163 and the third electric ball valve 164. The second pressure sensor 172 is installed on the second supply pipe 122, located between the second electric ball valve 163 and the third electric ball valve 164. The third pressure sensor 173 is installed at the end of the first vent pipe 151 near the vacuum pump 150. The other side of the first buffer tank 181 is connected to the inlet of the product under test 200 through the third supply pipe 123, and an exhaust port is formed at the top. One end of the fourth electric ball valve 182 is connected to the exhaust port. The inlet of the exhaust pump 183 is connected to the other end of the fourth electric ball valve 182. The fifth electric ball valve 184 is installed on the third supply pipe 123. The other side of the second buffer tank 185 is connected to the outlet of the product under test 200 through the third vent pipe 153, and an air inlet is formed at the bottom. One end of the sixth electric ball valve 186 is connected to the air inlet. The outlet of the air compressor 187 is connected to the other end of the sixth electric ball valve 186. The seventh electric ball valve 188 is installed on the third outlet pipe 153.

[0039] The working process and principle of the fully automated liquid injection testing equipment are as follows: First, the vacuuming mode is activated. In vacuuming mode, the first electric ball valve 162, the fifth electric ball valve 184, and the seventh electric ball valve 188 are opened, while the second electric ball valve 163, the third electric ball valve 164, the fourth electric ball valve 182, the sixth electric ball valve 186, and the electric pressure relief valve 161 are closed. The vacuum pump 150 is started, evacuating air from the inside of the product under test 200, the first buffer tank 181, the second buffer tank 185, and the pipelines. When the vacuum level inside the product under test 200 reaches the preset value, the vacuum pump 150 stops operating. By evacuating, a negative pressure condition is created for subsequent liquid injection, ensuring that there are no air bubbles in the cooling medium inside the product under test 200, improving the injection accuracy, and thus contributing to improved test precision. Next, the liquid injection mode is activated. In liquid injection mode, liquid injection is performed in two stages. In the first injection stage, the second electric ball valve 163, the third electric ball valve 164, the fifth electric ball valve 184, and the seventh electric ball valve 188 are opened, while the first electric ball valve 162, the fourth electric ball valve 182, the sixth electric ball valve 186, and the electric pressure relief valve 161 are closed. The infusion pump 120 is started, and the delivery flow rate is adjusted by regulating the speed of the infusion pump 120. In the second injection stage, firstly, the fourth electric ball valve 182 is opened, while the first electric ball valve 162, the second electric ball valve 163, the third electric ball valve 164, the fifth electric ball valve 184, the sixth electric ball valve 186, the seventh electric ball valve 188, and the electric pressure relief valve 161 are closed. The exhaust pump 183 is started to expel the residual air in the first buffer tank 181. Then, the second electric ball valve 163 and the third electric ball valve 164 open, while the first electric ball valve 162, the fourth electric ball valve 182, the fifth electric ball valve 184, the sixth electric ball valve 186, the seventh electric ball valve 188, and the electric pressure relief valve 161 close. The infusion pump 120 is then started to continue delivering liquid into the first buffer tank 181. This further ensures the injection accuracy and thus improves the test precision. Next, a constant pressure mode is implemented. In constant pressure mode, the second electric ball valve 163, the third electric ball valve 164, the fifth electric ball valve 184, and the seventh electric ball valve 188 open, while the first electric ball valve 162, the fourth electric ball valve 182, the sixth electric ball valve 186, and the electric pressure relief valve 161 close. The infusion pump 120 starts and runs continuously for a certain period to ensure the stability of the injection pressure. Finally, a pressure holding mode is implemented.In pressure-holding mode, the second electric ball valve 163, the fifth electric ball valve 184, and the seventh electric ball valve 188 are open, while the first electric ball valve 162, the third electric ball valve 164, the fourth electric ball valve 182, the sixth electric ball valve 186, and the electric pressure relief valve 161 are closed. The first pressure sensor 171 and the second pressure sensor 172 continuously monitor the pressure in the second liquid supply pipe 122, the third liquid supply pipe 123, the third vent pipe 153, the first buffer tank 181, the second buffer tank 185, and the product under test 200 to determine whether any leakage has occurred in these areas. Finally, the pressure relief mode is activated. It should be noted that in vacuum mode, the sixth electric ball valve 186 can be opened appropriately, and a small amount of compressed air can be introduced into the second buffer tank 185, the product under test 200, and the first buffer tank 181 using the air compressor 187 to prevent the negative pressure in the product under test 200, the first buffer tank 181, and the second buffer tank 185 from becoming too low. In depressurization mode, the sixth electric ball valve 186 can be opened appropriately, and compressed air can be blown into the second buffer tank 185, the product under test 200, and the first buffer tank 181 using the air compressor 187 to remove the cooling medium remaining in the product under test 200, the first buffer tank 181, and the second buffer tank 185. Compared to vacuum drying, this method is suitable for drying products with more complex internal structures.

[0040] Reference Figure 10In another embodiment, the fully automated liquid injection testing equipment includes a storage tank 110, an infusion pump 120, a first return pipe 131, a first drain pipe 141, a vacuum pump 150, an electric pressure relief valve 161, a first electric ball valve 162, a second electric ball valve 163, a third electric ball valve 164, a first pressure sensor 171, a second pressure sensor 172, a third pressure sensor 173, a simulation element 191, a fourth supply pipe 124, an eighth electric ball valve 192, a fourth vent pipe 154, a ninth electric ball valve 193, and an intracavitary pressure detection sensor 194. A supply port 111 is formed at the bottom of the storage tank 110, and a first return port 112 is formed at the top of the storage tank 110. The input end of the infusion pump 120 is connected to the supply port 111 via the first supply pipe 121, and the output end is connected to the inlet of the product under test 200 via the second supply pipe 122. One end of the first return pipe 131 is connected to the second supply pipe 122, and the other end is connected to the first return port 112. One end of the first drain pipe 141 is connected to the first return pipe 131. The input end of the vacuum pump 150 is connected to the outlet of the product under test 200 through the first vent pipe 151, and the output end is connected to the first drain pipe 141 through the second vent pipe 152. An electric pressure relief valve 161 is installed on the end of the first return pipe 131 near the second supply pipe 122. A first electric ball valve 162 is installed on the end of the first vent pipe 151 away from the vacuum pump 150. A second electric ball valve 163 is installed on the end of the second supply pipe 122 away from the infusion pump 120. A third electric ball valve 164 is installed on the end of the second supply pipe 122 near the infusion pump 120. A first pressure sensor 171 is installed on the second supply pipe 122 and is located between the second electric ball valve 163 and the third electric ball valve 164. The second pressure sensor 172 is mounted on the second supply pipe 122 and is located between the second electric ball valve 163 and the third electric ball valve 164. The third pressure sensor 173 is mounted on the end of the first vent pipe 151 near the vacuum pump 150. A liquid level observation port 1911 is formed on the top of the simulation component 191. One end of the fourth supply pipe 124 is connected to the end of the second supply pipe 122 away from the infusion pump 120, and the other end is connected to the inlet of the simulation component 191. The eighth electric ball valve 192 is mounted on the fourth supply pipe 124. One end of the fourth vent pipe 154 is connected to the end of the first vent pipe 151 away from the vacuum pump 150, and the other end is connected to the outlet of the simulation component 191. The ninth electric ball valve 193 is mounted on the fourth vent pipe 154. An internal pressure detection sensor 194 is mounted inside the simulation component 191 to detect the internal pressure of the simulation component 191.

[0041] The working process and principle of the fully automated liquid injection testing equipment are as follows: First, the vacuuming mode is activated. In vacuuming mode, the first electric ball valve 162 and the ninth electric ball valve 193 are opened, while the second electric ball valve 163, the third electric ball valve 164, the eighth electric ball valve 192, and the electric pressure relief valve 161 are closed. The vacuum pump 150 is activated to extract air from the product under test 200, the simulation component 191, and the pipelines. The air pressure inside the simulation component 191 is monitored in real time by the intracavity pressure detection sensor 194 to understand the air pressure inside the product under test 200. When the vacuum level inside the simulation component 191 reaches the preset value, the vacuum pump 150 stops operating. By evacuating, a negative pressure condition is created for subsequent liquid injection, ensuring that there are no air bubbles in the cooling medium inside the product under test 200, improving the liquid injection accuracy, and thus improving the test accuracy. Then, the liquid injection mode is activated. In injection mode, the second electric ball valve 163, the third electric ball valve 164, and the eighth electric ball valve 192 are opened, while the first electric ball valve 162, the ninth electric ball valve 193, and the electric pressure relief valve 161 are closed. The infusion pump 120 is started, and the delivery flow rate is adjusted by regulating the speed of the infusion pump 120. The pressure in the pipeline and the test product 200 is detected by the first pressure sensor 171 / second pressure sensor 172, and the internal pressure of the simulation component 191 is monitored in real time by the intracavity pressure detection sensor 194, thus monitoring the pressure inside the test product 200 in real time. When the pressure reaches the preset value, the third electric ball valve 164 closes. The liquid level inside the simulation component 191 can be observed through the closed transparent liquid level observation port 1911, thus enabling real-time monitoring of the liquid level inside the test product 200. Afterwards, a constant pressure mode is implemented. In constant pressure mode, the second electric ball valve 163, the third electric ball valve 164, and the eighth electric ball valve 192 are open, while the first electric ball valve 162, the ninth electric ball valve 193, and the electric pressure relief valve 161 are closed. The infusion pump 120 starts and runs continuously for a certain period of time to ensure the stability of the injection pressure. Next, the pressure holding mode is implemented. In pressure holding mode, the second electric ball valve 163 and the eighth electric ball valve 192 are open, while the first electric ball valve 162, the third electric ball valve 164, the ninth electric ball valve 193, and the electric pressure relief valve 161 are closed. The first pressure sensor 171 and the second pressure sensor 172 continuously monitor the pressure in the second supply pipe 122 and the product under test 200 to determine whether leakage has occurred in the second supply pipe 122 and the product under test 200. At the same time, the intracavity pressure detection sensor 194 monitors the pressure in the simulation component 191 in real time to monitor the pressure in the product under test 200 in real time. Finally, the pressure relief mode is implemented. In the pressure relief mode, the second electric ball valve 163, the eighth electric ball valve 192 and the electric pressure relief valve 161 are opened, and the first electric ball valve 162, the third electric ball valve 164 and the ninth electric ball valve 193 are closed, so that the cooling medium in the test product 200 and the simulation component 191 flows into the liquid storage tank 110 or flows to the floor drain.

[0042] The implementation principle of this embodiment is as follows: First, a vacuuming mode is performed. Then, a liquid injection mode is performed. Next, a constant pressure mode is performed. Then, a pressure holding mode is performed. Finally, a pressure release mode is performed. Overall, the fully automated liquid injection testing equipment can sequentially complete the liquid injection process, the pressure holding process, the pressure detection process, and the pressure release process, effectively reducing the testing difficulty, improving the testing efficiency, and ensuring the testing accuracy.

[0043] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape, and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A fully automated liquid injection testing device, characterized in that, include: A liquid storage tank (110) is used to store the cooling working fluid. A liquid supply port (111) is formed at the bottom and a first liquid return port (112) is formed at the top. The infusion pump (120) has its input end connected to the inlet (111) via the first supply pipe (121) and its output end connected to the inlet of the product to be tested (200) via the second supply pipe (122). The first return pipe (131) is connected at one end to the second supply pipe (122) and at the other end to the first return port (112); The first drain pipe (141) is connected at one end to the first return pipe (131); The vacuum pump (150) has its input end connected to the outlet of the product to be tested (200) through the first outlet pipe (151), and its output end connected to the first drain pipe (141) through the second outlet pipe (152). An electric pressure relief valve (161) is installed at one end of the first return pipe (131) near the second supply pipe (122); The first electric ball valve (162) is installed at the end of the first outlet pipe (151) away from the vacuum pump (150); The second electric ball valve (163) is installed at the end of the second liquid supply pipe (122) away from the infusion pump (120); The third electric ball valve (164) is installed at one end of the second supply pipe (122) near the infusion pump (120); The first pressure sensor (171) is installed on the second liquid supply pipe (122) and is located between the second electric ball valve (163) and the third electric ball valve (164); The second pressure sensor (172) is installed on the second liquid supply pipe (122) and is located between the second electric ball valve (163) and the third electric ball valve (164); A third pressure sensor (173) is installed at one end of the first outlet pipe (151) near the vacuum pump (150).

2. The fully automated liquid injection testing equipment according to claim 1, characterized in that, Also includes: A safety valve (165) is installed at one end of the second supply pipe (122) near the infusion pump (120) and is located between the infusion pump (120) and the third electric ball valve (164); A pressure switch (174) is installed at one end of the second supply pipe (122) near the infusion pump (120) and is located between the safety valve (165) and the third electric ball valve (164); A one-way valve (166) is installed at one end of the second supply pipe (122) near the infusion pump (120) and is located between the pressure switch (174) and the third electric ball valve (164).

3. The fully automated liquid injection testing equipment according to claim 1, characterized in that, Also includes: A filter (175) is installed on the first liquid supply pipe (121).

4. The fully automated liquid injection testing equipment according to claim 1, characterized in that, Also includes: The first oil-water separator (176) is installed on the first vent pipe (151) and is located between the third pressure sensor (173) and the first electric ball valve (162); The second oil-water separator (177) is installed on the second vent pipe (152).

5. The fully automated liquid injection testing equipment according to claim 1, characterized in that, Also includes: The first solenoid valve (167) is installed at one end of the first return pipe (131) near the liquid storage tank (110); The second solenoid valve (168) is installed at one end of the first drain pipe (141) near the first return pipe (131).

6. The fully automated liquid injection testing equipment according to claim 1, characterized in that, The top of the liquid storage tank (110) is formed with a second return port (113), an overflow port (114), a first replenishment port (115), and a second replenishment port (116); Also includes: The second return pipe (132) is connected at one end to the second supply pipe (122) and at the other end to the second return port (113); A manual pressure relief valve (1691) is installed on the second return pipe (132); An overflow pipe (133) is connected at one end to the first drain pipe (141) and at the other end to the overflow port (114); An overflow valve (1692) is installed on the overflow pipe (133); The second drain pipe (142) is connected at one end to the first supply pipe (121) and at the other end to the first drain pipe (141); A drain valve (1693) is installed on the second drain pipe (142); One end of the replenishment tube (134) is connected to the first replenishment port (115); An electric replenishment valve (1694) is installed on the replenishment pipe (134).

7. The fully automated liquid injection testing device according to claim 1, characterized in that, Also includes: A level gauge (117) is installed on the liquid storage tank (110).

8. The fully automated liquid injection testing equipment according to claim 1, characterized in that, Also includes: An isolation valve (1695) is installed on the second supply pipe (122) and is located between the first pressure sensor (171) and the second pressure sensor (172).

9. The fully automated liquid injection testing equipment according to claim 1, characterized in that, Also includes: The first buffer tank (181) is connected on one side to the end of the second liquid supply pipe (122) away from the infusion pump (120), and on the other side is connected to the inlet of the product to be tested (200) through the third liquid supply pipe (123). An exhaust port is formed on the top. The fourth electric ball valve (182) is connected at one end to the exhaust port; An exhaust pump (183) has its inlet connected to the other end of the fourth electric ball valve (182); The fifth electric ball valve (184) is installed on the third liquid supply pipe (123); The second buffer box (185) is connected on one side to the end of the first air outlet pipe (151) away from the vacuum pump (150), and on the other side to the outlet of the product to be tested (200) through the third air outlet pipe (153). An air inlet is formed at the bottom. The sixth electric ball valve (186) is connected at one end to the air inlet; The outlet of the air compressor (187) is connected to the other end of the sixth electric ball valve (186); The seventh electric ball valve (188) is installed on the third air outlet pipe (153).

10. The fully automated liquid injection testing device according to claim 1, characterized in that, Also includes: The simulation component (191) has a liquid level observation port (1911) formed on the top; The fourth liquid supply pipe (124) is connected at one end to the end of the second liquid supply pipe (122) away from the infusion pump (120), and at the other end to the inlet of the simulation component (191); The eighth electric ball valve (192) is installed on the fourth liquid supply pipe (124); The fourth exhaust pipe (154) is connected at one end to the end of the first exhaust pipe (151) away from the vacuum pump (150), and at the other end to the outlet of the simulation component (191). The ninth electric ball valve (193) is installed on the fourth air outlet pipe (154); An intracavity pressure detection sensor (194) is installed inside the simulation component (191).

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