Gas-liquid mixing sealing test system capable of controlling pressure and accurately metering

Abstract

The invention discloses a gas-liquid mixing sealing test system capable of controlling pressure and accurately metering, which relates to the technical field of sealing element testing and comprises a gas quantitative filling device, a liquid quantitative filling device, a gas quantitative discharging device, a liquid quantitative discharging device, a pressure control device and an experiment tank. The gas quantitative filling device, the liquid quantitative filling device, the gas quantitative discharging device, the liquid quantitative discharging device and the pressure control devices are all communicated with the experiment tank through pipelines, and the pressure control devices are further distributed on the pipelines of the gas quantitative filling device, the liquid quantitative filling device, the gas quantitative discharging device and the liquid quantitative discharging device.

Description

Technical Field

[0001] The invention belongs to the technical field of seal testing, and in particular relates to a pressure-controllable and accurately metered gas-liquid mixed seal testing system. Background Art

[0002] In the field of automotive air conditioning seal testing, with the continuous upgrading of technical standards and increasingly stringent environmental regulations, testing technology is gradually developing towards higher accuracy, higher efficiency and more comprehensive project coverage. In order to ensure that the seals perform stably and reliably in the actual complex and changeable automotive working environment, the testing process must accurately reproduce the various extreme working conditions of the automotive air conditioner in different working modes.

[0003] However, the automotive air-conditioning seal test systems currently used in the industry have many problems: lack of pressure control function, imprecise control of refrigerant and refrigeration oil dosage, and inability to fully simulate complex test conditions such as extreme environments such as gas / liquid immersion in different proportions, high pressure, and high-temperature aging. These deficiencies seriously restrict the in-depth evaluation of its sealing, high-temperature resistance, and durability reliability, resulting in the project test equipment being unable to be recognized by customers. Summary of the invention

[0004] In view of the problems mentioned in the background technology, the purpose of the present invention is to provide a gas-liquid mixed sealing test system with controllable pressure and precise metering to solve the problems mentioned in the background technology.

[0005] The above technical objectives of the present invention are achieved through the following technical solutions:

[0006] A pressure-controllable and precisely metered gas-liquid mixed sealing test system comprises a gas quantitative filling device, a liquid quantitative filling device, a gas quantitative discharge device, a liquid quantitative discharge device, a pressure control device and an experimental tank; the gas quantitative filling device, the liquid quantitative filling device, the gas quantitative discharge device, the liquid quantitative discharge device and the pressure control device are all connected to the experimental tank through a pipeline, and the pressure control device is also distributed on the pipelines of the gas quantitative filling device, the liquid quantitative filling device, the gas quantitative discharge device and the liquid quantitative discharge device.

[0007] As a preferred technical solution, the gas quantitative filling device includes a refrigerant gas storage tank and a refrigerant filling pump connected by pipelines. The refrigerant filling pump is connected to the experimental tank through a pipeline, and a mass flow meter 1, a flow regulating valve 1 and a stop valve 2 of the pressure control device are installed in sequence on the connecting pipeline from the refrigerant filling pump to the experimental tank.

[0008] As a preferred technical solution, the liquid quantitative filling device includes a refrigeration oil filling tank and a liquid filling pump connected by pipelines. The liquid filling pump is connected to the experimental tank through a pipeline, and a mass flow meter three, a flow regulating valve three and a stop valve six of the pressure control device are installed in sequence on the connecting pipeline from the liquid filling pump to the experimental tank.

[0009] As a preferred technical solution, the gas quantitative emission device includes a refrigerant recovery tank and a vacuum pump connected by pipelines. The vacuum pump is connected to the experimental tank through a pipeline and a shut-off valve 3, a mass flow meter 2 and a flow regulating valve 2 of a pressure control device are installed in sequence on the connecting pipeline from the experimental tank to the vacuum pump 1.

[0010] As a preferred technical solution, the liquid discharge device includes a refrigeration oil recovery tank and a hydraulic pump connected by pipelines. The hydraulic pump is connected to the experimental tank through a pipeline, and a shut-off valve seven, a mass flow meter four and a flow regulating valve four of a pressure control device are installed in sequence on the connecting pipeline from the experimental tank to the hydraulic pump.

[0011] As a preferred technical solution, the pressure control device also includes a pressure sensor and a safety valve; the pressure sensor is connected to the inside of the experimental tank, and the safety valve is installed on the connecting pipeline between the pressure sensor and the experimental tank.

[0012] As an optimal technical solution, it also includes a gas-liquid mixing heating device, which includes a heating magnetic stirrer, an insulation cover and a temperature sensor. The heating magnetic stirrer is installed under the experimental tank, and the magnetic rotor of the heating magnetic stirrer is in contact with and connected to the bottom end of the experimental tank. The experimental tank is installed in the insulation cover, and the sensing end of the temperature sensor is inserted into the experimental tank and the temperature sensor is electrically connected to the heating magnetic stirrer.

[0013] As a preferred technical solution, it also includes a sealed leak detection device, which includes a leak detection tank and a collection and detection device. The leak detection tank is installed in an experimental tank, and a seal to be tested is installed on the leak detection tank. The test end of the collection and detection device passes through the experimental tank and is connected to the leak detection tank, and the other end of the collection and detection device is connected to the end of the gas quantitative emission device.

[0014] As a preferred technical solution, the collection and detection device includes a pressure sensor 2, a mass flow meter 5, a stop valve 9, a leakage collection and detection component, a vacuum pump 2 and a stop valve 10, which are installed on the pipeline in sequence from the experimental tank to the end of the gas quantitative emission device. The leakage collection and detection component includes a gas composition meter and a liquid composition analyzer.

[0015] As a preferred technical solution, the leak detection tank includes a leak detection tank body and a leak detection tank cover, a pipeline connected to a pressure sensor is inserted into the tank body, the seal to be detected includes a seal to be detected one and a seal to be detected two, the cross-section of the leak detection tank cover is T-shaped, and the seal to be detected one and the seal to be detected two are respectively installed between the sealing side surface and the sealing end surface of the tank cover and the tank body.

[0016] Beneficial Effects

[0017] This system can be used to test automotive air-conditioning seals. It can accurately control the pressure of gas and liquid and accurately measure the filling and discharge of refrigerant and refrigeration oil. It also has gas-liquid mixing heating function and seal leak detection test function. It can be used to simulate complex test conditions such as gas / liquid immersion in different proportions, high-pressure extreme environment and high-temperature aging. In addition, this system can also perform simple and specific operations as required, and is fully functional.

[0018] At the same time, the gas-liquid mixing test, pressure control and metering filling equipment and sealing performance test equipment involved in this system are applicable to many fields such as medical equipment, chemical containers, oil and gas pipelines, aerospace, shipbuilding, electronic equipment, etc., and are widely used.

[0019] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the structure of a pressure-controllable and precisely metered gas-liquid mixed sealing test system proposed in Example 1;

[0021] Figure 2 This is a simplified structural diagram of a pressure-controllable and precisely metered gas-liquid mixed sealing test system proposed in Example 2;

[0022] Figure 3 This is a cross-sectional schematic diagram of a leak detection tank of a gas-liquid mixed sealing test system capable of accurate metering and pressure control proposed in Example 3.

[0023] Figure numerals: 1, refrigerant gas storage tank; 2, stop valve 1; 3, refrigerant filling pump; 4, mass flow meter 1; 5, flow control valve 1; 6, stop valve 2; 7, pressure sensor 1; 8, safety valve; 9, stop valve 3; 10, mass flow meter 2; 11, flow control valve 2; 12, vacuum pump 1; 13, stop valve 4; 14, refrigerant recovery tank; 15, refrigeration oil filling tank; 16, stop valve 5; 17, liquid filling pump; 18, mass flow meter 3; 19, flow control valve 3; 20, stop valve 6; 21, stop valve 7; 22, mass flow meter 4; 23, Flow regulating valve four; 24, hydraulic pump; 25, stop valve eight; 26, refrigeration oil recovery tank; 27, heating magnetic stirrer; 28, magnetic rotor; 29, insulation sleeve; 30, tank body; 31, tank cover; 32, temperature sensor; 33, leak detection tank; 33-1, leak detection tank body; 33-2, seal to be detected one; 33-3, seal to be detected two; 33-4, fastener; 33-5, leak detection tank cover; 34, pressure sensor two; 35, mass flowmeter five; 36, stop valve nine; 37, leak collection and detection assembly; 38, vacuum pump two; 39, stop valve ten 39. DETAILED DESCRIPTION

[0024] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar symbols throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0025] Example 1

[0026] refer to Figure 1 The present embodiment describes a pressure-controllable and precisely metered gas-liquid mixed sealing test system, comprising a gas quantitative filling device, a liquid quantitative filling device, a gas quantitative discharge device, a liquid quantitative discharge device, a pressure control device, a gas-liquid mixed heating device, a sealing leak detection device and an experimental tank; the gas-liquid mixed heating device is installed on the experimental tank, and the gas quantitative filling device, the liquid quantitative filling device, the gas quantitative discharge device, the liquid quantitative discharge device, the pressure control device and the sealing leak detection device are all connected to the experimental tank through a pipeline, the pressure control device is also distributed on the pipelines of the gas quantitative filling device, the liquid quantitative filling device, the gas quantitative discharge device and the liquid quantitative discharge device, and the sealing leak detection device is also connected to the gas quantitative discharge device.

[0027] The gas quantitative filling device and the liquid quantitative filling device are used to fill the test tank with preset masses of gas and liquid respectively. The gas quantitative discharge device and the liquid quantitative discharge device are used to collect the waste gas and waste liquid discharged from the test tank during the sealing test respectively. The pressure control device detects the pressure state in the test tank and controls the gas quantitative filling device, the liquid quantitative filling device, the gas quantitative discharge device and the liquid quantitative discharge device to fill / discharge gas / liquid according to the detected state to meet the demand, and immediately relieves the pressure to protect the test tank when the pressure exceeds the preset safety limit. The test tank is used to contain the gas, liquid or their mixture required during the sealing test. The gas-liquid mixing heating device is used to increase the temperature to accelerate the test process, and use the stirring function to optimize the gas / liquid mixing degree in the test tank. The sealing leak detection device evaluates the sealing performance and use effect of the automotive air-conditioning seals under actual working conditions by analyzing the collected leaked gas / liquid.

[0028] The gas quantitative filling device includes a refrigerant gas storage tank 1 and a refrigerant filling pump 3. The refrigerant gas storage tank 1 and the refrigerant filling pump 3 are connected by a pipeline and a stop valve 2 is installed on the connecting pipeline. The refrigerant filling pump 3 is connected to the experimental tank through a pipeline and a mass flow meter 4, a flow regulating valve 5 and a stop valve 6 of a pressure control device are installed in sequence on the connecting pipeline from the refrigerant filling pump 3 to the experimental tank.

[0029] When quantitatively charging gas, open stop valve 1 2 and stop valve 2 6, start the refrigerant charging pump 3, adjust the flow regulating valve 1 5 to control the flow rate of the injected gas according to the gas charging amount fed back by the mass flow meter 1 4, and immediately close the stop valve 2 6 and the refrigerant charging pump 3 when the preset value is reached.

[0030] The liquid quantitative filling device includes a refrigeration oil filling tank 15 and a liquid filling pump 17. The refrigeration oil filling tank 15 and the liquid filling pump 17 are connected by a pipeline and a stop valve 5 16 is installed on the connecting pipeline. The liquid filling pump 17 is connected to the experimental tank through a pipeline and a mass flow meter 3 18, a flow regulating valve 3 19 and a stop valve 6 20 of the pressure control device are installed in sequence on the connecting pipeline from the liquid filling pump 17 to the experimental tank.

[0031] When quantitatively filling liquid, open stop valve five 16 and stop valve six 20, start liquid filling pump 17, adjust flow regulating valve three 19 to control the flow rate of injected liquid according to the liquid filling amount fed back by mass flow meter three 18, and immediately close stop valve six 20 and liquid filling pump 17 when the preset value is reached.

[0032] Preferably, a control system can be added to electrically connect the refrigerant filling pump 3, mass flow meter 14, flow regulating valve 15 and stop valve 26 as well as the liquid filling pump 17, mass flow meter 3 18, flow regulating valve 3 19 and stop valve 6 20 to the control system. When quantitatively filling gas, open the stop valve 12 and the stop valve 2 6, and the control system controls to open the refrigerant filling pump 3. According to the gas filling amount feedback from the mass flow meter 14, the control system autonomously adjusts the flow regulating valve 15 to control the flow rate of the injected gas. When it is detected that the preset value is reached, the control system controls to close the stop valve 2 6 and the refrigerant filling pump 3. Similarly, when quantitatively filling liquid, open the stop valve 5 16 and the stop valve 6 20, and the control system controls to open the liquid filling pump 17. According to the liquid filling amount feedback from the mass flow meter 3 18, the control system autonomously adjusts the flow regulating valve 3 19 to control the flow rate of the injected liquid. When it is detected that the preset value is reached, the control system controls to close the stop valve 6 20 and the liquid filling pump 17. No manual intervention is required, which is more intelligent and efficient.

[0033] The gas quantitative emission device includes a refrigerant recovery tank 14 and a vacuum pump 12. The refrigerant recovery tank 14 and the vacuum pump 12 are connected by a pipeline and a stop valve 4 13 is installed on the connecting pipeline. The vacuum pump 12 is connected to the experimental tank through a pipeline and a stop valve 3 9, a mass flow meter 2 10 and a flow regulating valve 2 11 of a pressure control device are installed in sequence on the connecting pipeline from the experimental tank to the vacuum pump 12.

[0034] When exhaust gas is discharged: first open the stop valve 4 13, then turn on the vacuum pump 12, and guide the gas in the experimental tank to be discharged toward the refrigerant recovery tank 14 through the negative pressure provided by the vacuum pump 12.

[0035] The liquid discharge device includes a refrigeration oil recovery tank 26 and a hydraulic pump 24. The refrigeration oil recovery tank 26 and the hydraulic pump 24 are connected by a pipeline and a stop valve eight 25 is installed on the connecting pipeline. The hydraulic pump 24 is connected to the experimental tank through a pipeline and a stop valve seven 21, a mass flow meter four 22 and a flow regulating valve four 23 of a pressure control device are installed in sequence on the connecting pipeline from the experimental tank to the hydraulic pump 24.

[0036] When discharging waste liquid: after opening the stop valve 8 25, the suction force provided by the hydraulic pump 24 drives the liquid in the experimental tank to flow to the refrigeration oil recovery tank 26.

[0037] The pressure control device also includes a pressure sensor 7 and a safety valve 8; the pressure sensor 7 is connected to the inside of the experimental tank, and the safety valve 8 is installed on the connecting pipeline between the pressure sensor 7 and the experimental tank.

[0038] Before the test, the stop valve three 9 and the stop valve seven 21 are opened to empty the residual fluid in the experimental tank. During the test, when the pressure sensor one 7 feedbacks that the pressure is insufficient, the stop valve two 6 and / or the stop valve six 20 are opened according to the test requirements, and a certain amount of gas and / or liquid medium is filled to increase the pressure in the experimental tank. After reaching the preset pressure, the stop valve two 6 and / or the stop valve six 20 are closed; when the pressure sensor one 7 detects an overpressure state, the stop valve three 9 and / or the stop valve seven 21 are opened to discharge a certain amount of gas and / or liquid medium to reduce the pressure in the experimental tank. After the pressure drops to the preset value, the stop valve three 9 and the stop valve seven 21 are closed; when the pressure exceeds the preset safety limit, the safety valve 8 is opened, and the pressure in the experimental tank is quickly released.

[0039] The experimental tank comprises a tank body 30 and a tank cover 31 ; the tank cover 31 is detachably fixed on the tank body 30 , and the above-mentioned communication with the experimental tank is that a pipeline passes through the tank cover 31 and communicates with the tank body 30 .

[0040] The gas-liquid mixing heating device comprises a heating magnetic stirrer 27, a heat preservation sleeve 29 and a temperature sensor 32. The heating magnetic stirrer 27 is installed below the tank body 30, the magnetic rotor 28 of the heating magnetic stirrer 27 is in contact with and connected to the bottom end of the tank body 30, the tank body 30 and the tank cover 31 are installed in the heat preservation sleeve 29, the sensing end of the temperature sensor 32 is inserted into the tank body 30, and the temperature sensor 32 is electrically connected to the heating magnetic stirrer 27.

[0041] During the test, the heating magnetic stirrer 27 presets the stirring rate and the heating temperature, the temperature sensor 32 monitors and records the temperature inside the tank body 30 in real time, and the temperature sensor 32 feeds back the recorded temperature to the heating magnetic stirrer 27 in real time. The heating magnetic stirrer 27 adjusts the heating temperature according to the difference between the recorded temperature and the set temperature and stirs the liquid in the tank body 30 through the magnetic rotor 28.

[0042] The sealing leak detection device includes a leak detection tank 33 and a collection and detection device. The leak detection tank 33 is installed in the tank body 30. A seal to be tested for leak detection is installed on the leak detection tank 33. The test end of the collection and detection device is connected to the leak detection tank 33 through the tank cover 31, and the other end of the collection and detection device is connected to the refrigerant recovery tank 14.

[0043] The collection and detection device includes a pressure sensor 2 34, a mass flow meter 5 35, a stop valve 9 36, a leakage collection and detection component 37, a vacuum pump 2 38 and a stop valve 10 39 which are installed in sequence on the pipeline from the tank body 30 to the refrigerant recovery tank 14. The leakage collection and detection component 37 includes a gas composition meter and a liquid composition analyzer. The liquid composition analyzer selects a suitable analyzer according to the composition of the refrigeration oil.

[0044] Before the test, open the stop valve nine 36, the stop valve ten 39 and the vacuum pump 38 to extract the residual gas and liquid in the leakage collection detection component 37 and the pipeline; when performing the sealing test, keep the stop valve nine 36 and the vacuum pump 38 open, close the stop valve ten 39, and the vacuum pump 38 drives the leaked gas / liquid to flow along the pipeline through the pressure sensor two 34 and the mass flow meter three 35 into the leakage collection detection component 37, the pressure sensor two 34 monitors the pressure change in the leak detection tank 33, the mass flow meter three 35 monitors the flow rate of the fluid in the pipeline in real time, and the leakage collection detection component 37 performs further component analysis on the collected gas / liquid, so as to evaluate the performance of the seal to be tested.

[0045] Testing steps:

[0046] S1: Preparation: Build the system, install the seal to be tested on the leak detection tank 33, set the heating temperature and stirring parameters of the heating magnetic stirrer 27, the pressure parameters of the pressure control device, the pressure sensor 2 34, the mass flow meter 5 35, the detection parameters of the leakage collection and detection component 37 and the gas / liquid mass of the gas / liquid quantitative filling device;

[0047] S2: Before testing: open the stop valve three 9 and the stop valve seven 21 to drain the residual fluid in the tank 30, open the stop valve nine 36, the stop valve ten 39 and the vacuum pump 38, extract the residual gas and liquid in the leakage collection and detection component 37 and the pipeline, and close the stop valve three 9 and the stop valve seven 21 after completion;

[0048] S3: Filling gas / liquid with preset mass and proportion: open stop valve 1 2 and stop valve 2 6, start refrigerant filling pump 3, adjust flow regulating valve 1 5 to control the flow rate of injected gas according to the gas filling amount fed back by mass flow meter 1 4, and immediately close stop valve 2 6 and refrigerant filling pump 3 when the preset value is reached; open stop valve 5 16 and stop valve 6 20, start liquid filling pump 17, adjust flow regulating valve 3 19 to control the flow rate of injected liquid according to the liquid filling amount fed back by mass flow meter 3 18, and immediately close stop valve 6 20 and liquid filling pump 17 when the preset value is reached;

[0049] S4: pre-adjusting to simulate a high temperature environment: starting the heating magnetic stirrer 27 to stir and heat, the temperature sensor 32 monitors and records the temperature in the tank 30 in real time, and the heating magnetic stirrer 27 adjusts the temperature and stirring speed in real time according to the feedback result of the temperature sensor 32;

[0050] S5: Pre-adjustment to simulate high-pressure environment: pressure sensor 17 monitors the pressure in the tank 30 in real time. When pressure sensor 17 feedbacks that the pressure is insufficient, stop valve 26 and / or stop valve 6 20 are opened according to the test requirements, and a certain amount of gas and / or liquid medium is filled in. After reaching the preset pressure, stop valve 26 and / or stop valve 6 20 are closed; when pressure sensor 17 detects an overpressure state, stop valve 3 9 and / or stop valve 7 21 are opened, and stop valve 3 9 and stop valve 7 21 are closed after the pressure drops to the preset value; when the pressure exceeds the preset safety limit, the safety valve 8 is opened;

[0051] S6: During the test: after reaching the preset test conditions, keep the stop valve nine 36 and the vacuum pump 38 open, close the stop valve ten 39, the pressure sensor two 34 monitors the pressure change in the leak detection tank 33, the mass flow meter three 35 monitors the flow rate of the fluid in the pipeline in real time, and the leakage collection and detection component 37 performs further component analysis on the collected gas / liquid;

[0052] S7: After the test is completed: open the stop valve 4 13 and the vacuum pump 12 to discharge the waste gas; open the stop valve 8 25 and the hydraulic pump 24 to discharge the waste liquid.

[0053] Example 2

[0054] refer to Figure 2 The simple method of using a pressure-controlled and precisely metered gas-liquid mixed sealing test system described in this embodiment is used for pressure-controlled gas / liquid precise metering filling test, and does not involve a gas-liquid mixed heating device and a sealing leak detection device. It includes a gas quantitative filling device, a liquid quantitative filling device, a gas quantitative discharge device, a liquid quantitative discharge device, a pressure control device and an experimental tank; the gas quantitative filling device, the liquid quantitative filling device, the gas quantitative discharge device, the liquid quantitative discharge device and the pressure control device are all connected to the experimental tank through pipelines, and the pressure control device is also distributed on the pipelines of the gas quantitative filling device, the liquid quantitative filling device, the gas quantitative discharge device and the liquid quantitative discharge device.

[0055] Before the test, open stop valve three 9, stop valve four 13 and vacuum pump one 12 to extract the residual gas in the test tank and pipeline; when conducting the seal immersion test, keep stop valve one 2 and stop valve two 6 open, and the refrigerant filling pump 3 drives the gas in the refrigerant gas storage tank 1 to flow along the pipeline through mass flow meter one 4 and flow regulating valve one 5 into the test tank; keep stop valve five 16 and stop valve six 20 open, and the liquid filling pump 17 drives the liquid in the refrigeration oil filling tank 15 to flow along the pipeline through mass flow meter three 18 and flow regulating valve three 19 into the test tank, and the pressure sensor one 7 monitors the pressure change in the test tank, and the mass flow meter one 4 and mass flow meter three 18 monitor the flow rate of the fluid in the pipeline in real time, so as to control the mixed gas-liquid ratio and pressure of the seal to be tested.

[0056] Testing steps:

[0057] S1: Build the system, connect the components through pipelines, set the pressure parameters of the pressure control device, mass flow meter 14, mass flow meter 318 and the gas / liquid mass of the gas / liquid quantitative filling device;

[0058] S2: Before the test: open the stop valve 12 and the stop valve 26, start the refrigerant filling pump 3, adjust the flow regulating valve 15 to control the flow rate of the injected gas according to the gas charging amount fed back by the mass flow meter 14, and immediately close the stop valve 26 and the refrigerant filling pump 3 when the preset value is reached, and flush the preset value of gas; open the stop valve 516 and the stop valve 620, start the liquid filling pump 17, adjust the flow regulating valve 319 to control the flow rate of the injected liquid according to the liquid charging amount fed back by the mass flow meter 318, and immediately close the stop valve 620 and the liquid filling pump 17 when the preset value is reached, and flush the preset value of liquid;

[0059] S3: Pre-adjustment: The pressure sensor 1 7 monitors the pressure in the tank 30 in real time. When the pressure sensor 1 7 feedbacks that the pressure is insufficient, the stop valve 2 6 and / or the stop valve 6 20 are opened according to the test requirements, and a certain amount of gas and / or liquid medium is filled in to increase the pressure in the test tank to the set initial pressure;

[0060] S4: During the test: the pressure sensor 7 monitors the pressure in the tank 30 in real time, and accurately controls the pressure in the test tank through the opening of each valve. If the pressure sensor 7 feedbacks that the pressure is insufficient, the stop valve 26 and / or the stop valve 6 20 are opened according to the test requirements, and a certain amount of gas and / or liquid medium is filled; when the pressure sensor 7 detects an overpressure state, the stop valve 3 9 and / or the stop valve 7 21 are opened, and the stop valve 3 9 and the stop valve 7 21 are closed after the pressure drops to the preset value;

[0061] S5: During the test: immerse the sample to be tested in the tank body 30 with preset gas / liquid mass and pressure, record the pressure change data in the tank body 30, and analyze the test results;

[0062] S6: After the test is completed: open the stop valve 4 13 and the vacuum pump 12 to discharge the waste gas; open the stop valve 8 25 and the hydraulic pump 24 to discharge the waste liquid.

[0063] This embodiment mainly demonstrates the pressure control and gas / liquid accurate metering filling test process, and does not involve the gas-liquid mixing heating device and the sealing leak detection device. In actual application, which system parts to use can be selected according to specific needs to meet different test requirements.

[0064] Example 3

[0065] refer to Figure 1 and 3The specific structure of the leak detection tank 33 in the gas-liquid mixed sealing test system with controllable pressure and precise measurement described in this embodiment is that the leak detection tank 33 includes a leak detection tank body 33-1 and a leak detection tank cover 33-5. A hole is provided on the top of the tank body 33-1, and a pipeline connected to the pressure sensor 34 is inserted into the hole. The leak detection tank body 33-1 and the leak detection tank cover 33-5 are fixedly connected by a fastener 33-4. The seal to be detected includes a seal to be detected 1 33-2 and a seal to be detected 2 33-3. The cross-section of the leak detection tank cover 33-5 is T-shaped. The seal to be detected 1 33-2 is installed between the sealing side surface where the tank cover 33-5 and the tank body 33-1 are connected, and the seal to be detected 2 33-3 is installed between the sealing end surface where the tank cover 33-5 and the tank body 33-1 are connected.

[0066] The leak detection tank 33 - 1 and the pipeline are assembled and connected in a detachable manner. Preferably, the leak detection tank 33 - 1 and the pipeline are connected by threads.

[0067] The fastener 33 - 4 may be a bolt, a nut or other forms of threaded connectors.

[0068] The fastener 33-4 provides the necessary locking force to ensure the sealing and connection strength of the leak detection tank 33. The seal 1 33-2 to be tested is arranged on the side of the tank cover 33-5 to evaluate the radial sealing performance. The seal 2 33-3 to be tested is arranged on the end face of the tank cover 33-5 to evaluate the axial sealing performance.

[0069] The first seal to be tested 33-2 and the second seal to be tested 33-3 are installed in the sealing position of the tank cover 33-5, and the tank cover 33-5 is combined with the leak detection tank body 33-1 through the fastener 33-4 to form a sealed cavity. The assembly is connected to the pipeline reserved in the tank body 30 and connected to the sealed leak detection device. When the test system is running, the leak detection tank 33 is immersed in the test gas / liquid environment, and the first seal to be tested 33-2 and the second seal to be tested 33-3 play the role of isolating the sealed cavity from the test tank cavity to prevent the exchange of media between the two cavities. If a leak occurs during the test process, the leaked gas / liquid enters the collection and detection device through the pipeline, and the performance of the first seal to be tested 33-2 and the second seal to be tested 33-3 is evaluated through further analysis.

[0070] It should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0071] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0072] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0073] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0074] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A pressure-controlled and precisely metered gas-liquid mixed seal test system, characterized in that: It includes a gas quantitative filling device, a liquid quantitative filling device, a gas quantitative discharge device, a liquid quantitative discharge device, a pressure control device and an experimental tank; the gas quantitative filling device, the liquid quantitative filling device, the gas quantitative discharge device, the liquid quantitative discharge device and the pressure control device are all connected to the experimental tank through pipelines, and the pressure control device is also distributed on the pipelines of the gas quantitative filling device, the liquid quantitative filling device, the gas quantitative discharge device and the liquid quantitative discharge device.

2. The pressure-controlled and precisely metered gas-liquid mixed sealing test system according to claim 1 is characterized in that: The gas quantitative filling device comprises a refrigerant gas storage tank (1) and a refrigerant charging pump (3) which are connected by a pipeline. The refrigerant charging pump (3) is connected to a test tank through a pipeline, and a mass flow meter (4), a flow regulating valve (5) and a stop valve (6) of a pressure control device are sequentially installed on the connecting pipeline from the refrigerant charging pump (3) to the test tank.

3. The pressure-controlled and precisely metered gas-liquid mixed sealing test system according to claim 1 is characterized in that: The liquid quantitative filling device comprises a refrigeration oil filling tank (15) and a liquid filling pump (17) connected by a pipeline. The liquid filling pump (17) is connected to the experimental tank through a pipeline, and a mass flow meter three (18), a flow regulating valve three (19) and a stop valve six (20) of a pressure control device are installed in sequence on the connecting pipeline from the liquid filling pump (17) to the experimental tank.

4. The pressure-controlled and precisely metered gas-liquid mixed sealing test system according to claim 1 is characterized in that: The gas quantitative discharge device comprises a refrigerant recovery tank (14) and a vacuum pump (12) connected by pipelines. The vacuum pump (12) is connected to the experimental tank through a pipeline, and a stop valve (9), a mass flow meter (10) and a flow regulating valve (11) of a pressure control device are installed in sequence on the connecting pipeline from the experimental tank to the vacuum pump (12).

5. The pressure-controlled and precisely metered gas-liquid mixed sealing test system according to claim 1 is characterized in that: The liquid quantitative discharge device comprises a refrigeration oil recovery tank (26) and a hydraulic pump (24) connected by pipelines. The hydraulic pump (24) is connected to the experimental tank through a pipeline, and a stop valve seven (21), a mass flow meter four (22) and a flow regulating valve four (23) of a pressure control device are installed in sequence on the connecting pipeline from the experimental tank to the hydraulic pump (24).

6. The pressure-controlled and precisely metered gas-liquid mixed sealing test system according to claim 1 is characterized in that: The pressure control device also includes a pressure sensor (7) and a safety valve (8); the pressure sensor (7) is connected to the inside of the experimental tank, and the safety valve (8) is installed on the connecting pipeline between the pressure sensor (7) and the experimental tank.

7. The pressure-controlled and precisely metered gas-liquid mixed sealing test system according to claim 1 is characterized in that: The invention also comprises a gas-liquid mixing heating device, which comprises a heating magnetic stirrer (27), a heat preservation sleeve (29) and a temperature sensor (32). The heating magnetic stirrer (27) is installed below the experimental tank, the magnetic rotor (28) of the heating magnetic stirrer (27) is in contact with and connected to the bottom end of the experimental tank, the experimental tank is installed in the heat preservation sleeve (29), the sensing end of the temperature sensor (32) is inserted into the experimental tank, and the temperature sensor (32) is electrically connected to the heating magnetic stirrer (27).

8. The pressure-controllable and precisely metered gas-liquid mixed sealing test system according to claim 1, characterized in that: The invention also comprises a sealing leak detection device, which comprises a leak detection tank (33) and a collecting and detecting device. The leak detection tank (33) is installed in the experimental tank, a sealing member to be tested is installed on the leak detection tank (33), a testing end of the collecting and detecting device passes through the experimental tank and is connected to the leak detection tank (33), and the other end of the collecting and detecting device is connected to the end of the gas quantitative discharge device.

9. The pressure-controllable and precisely metered gas-liquid mixed sealing test system according to claim 8, characterized in that: The collection and detection device comprises a pressure sensor 2 (34), a mass flow meter 5 (35), a stop valve 9 (36), a leakage collection and detection component (37), a vacuum pump 2 (38) and a stop valve 10 (39) which are sequentially installed on a pipeline from a test tank to the end of a gas quantitative discharge device. The leakage collection and detection component (37) comprises a gas composition meter and a liquid composition analyzer.

10. The pressure-controllable and precisely metered gas-liquid mixed sealing test system according to claim 9, characterized in that: The leak detection tank (33) comprises a leak detection tank body (33-1) and a leak detection tank cover (33-5); a pipeline connected to a pressure sensor (34) is inserted into the tank body (33-1); a seal to be detected comprises a seal to be detected (33-2) and a seal to be detected (33-3); the cross section of the leak detection tank cover (33-5) is T-shaped; the seal to be detected (33-2) and the seal to be detected (33-3) are respectively installed between the sealing side surface and the sealing end surface where the tank cover (33-5) and the tank body (33-1) are connected.

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