A method and device for testing leakage of an externally opened W-ring seal

Abstract

The present invention relates to the technical field of aero-engine seal leakage measurement, and specifically discloses a method and device for testing the seal leakage of an externally-opened W-ring, including the following steps: S1, determining the high pressure outside the externally-opened W-ring and the normal pressure inside the externally-opened W-ring under the target working condition according to the pressure difference required by the test; S2, determining the vacuum negative pressure on the low-pressure side, and measuring the gas leakage under the exhaust condition; S3, calculating the gas leakage under the inflation condition. The present invention adopts the above-mentioned method and device for testing the seal leakage of an externally-opened W-ring, which utilizes a vacuum device to exhaust the inner side of the externally-opened W-ring and the pipeline to a negative pressure, to achieve a pressure difference between the inner and outer sides of the ring, replacing the equivalent working condition of high pressure outside and normal pressure inside, that is, using the method of exhausting air inside instead of the method of inflating air outside to achieve a pressure difference environment, overcoming the problem that the corrugated ring cannot meet the leakage test under high temperature and high pressure conditions, and broadening the working condition magnitude of the leakage measurement.

Description

Technical Field

[0001] The invention relates to the technical field of aero-engine seal leakage measurement, and in particular to a method and a device for testing the seal leakage of an externally opened W-ring under a high-temperature and high-pressure environment. Background Art

[0002] Metal elastic sealing rings are widely used static sealing devices in aircraft engines. W-type elastic sealing rings (W-rings for short) are an axial self-tightening static sealing element in metal elastic sealing rings. They are available in two types: inner and outer openings. They are often used to isolate the leakage of high-temperature gas from the opening side to the non-opening side. Sealing is critical to the fuel consumption rate, thrust-to-weight ratio, emissions, durability and maintenance costs of the engine. Reducing leakage in the secondary flow path through sophisticated sealing design can increase thrust by 4% to 6% and reduce fuel consumption by 3% to 5%.

[0003] In addition, leakage at the seal is one of the important reasons for the loss of performance of aircraft engines, and the leakage volume is an important indicator for evaluating the performance of W-rings. In the prior art, the leakage volume test of the W-ring is carried out under high temperature and high pressure environment. Generally, a closed cavity is constructed on the open side and the cavity is filled with high-pressure gas. For the inner open ring, it is generally formed by upper and lower pressure plates, the inner open W-ring and the intake pipe; for the outer open W-ring, a ring-shaped cylindrical closed cavity is formed by a corrugated ring, an outer open W-ring and upper and lower pressure plates. In the test, the corrugated ring itself is in a high temperature and high pressure working environment, and it is required to have better resilience and sealing than the test piece. The existing corrugated ring is difficult to meet the leakage test requirements. With the continuous improvement of the requirements for the sealing performance of the sealing ring, it is urgent to solve the problem of accurate testing of the leakage volume of the outer open W-ring under higher temperature and higher pressure environments under the premise of device standardization and process unification, so as to accurately and effectively evaluate its sealing performance. Summary of the invention

[0004] The purpose of the present invention is to provide a method and device for testing the leakage of an externally opened W-ring seal under a high temperature and high pressure environment, to replace the traditional pressure differential loading method of charging the high pressure side with high pressure, to solve the problem that the corrugated ring cannot meet the leakage test under high temperature and high pressure conditions, and to broaden the working condition magnitude of leakage measurement.

[0005] To achieve the above object, the present invention provides a method for testing the leakage of an externally opened W-ring seal under a high temperature and high pressure environment, comprising the following steps:

[0006] S1. Pressure difference according to test requirements Determine the high pressure outside the open W ring under the target working condition and normal pressure inside ;

[0007] S2. According to Determine the vacuum pressure on the low pressure side , and measured the gas leakage under the exhaust condition ;

[0008] S3. According to Calculate the gas leakage under inflation conditions .

[0009] Preferably, step S1 specifically comprises:

[0010] Pressure difference required according to target test conditions Determine the high pressure outside the outer opening W ring and normal pressure inside and the temperature and amount of deformation that needs to be applied.

[0011] Preferably, in step S2, the gas leakage under the pumping condition is The specific method of determining is:

[0012] The gas leaks from the upper and lower contact surfaces of the outer opening W ring from the outside of the ring to the inside. Ignoring the difference between the upper and lower contact surfaces, it is equivalent to a leakage microchannel. According to the calculation formula of the simple sealing ring sealing leakage mass flow, the gas leakage of the leakage microchannel is calculated. Q As shown in formula (1)

[0013] (1);

[0014] in, is the leakage coefficient related to the environmental conditions; A is the equivalent flow area; is the gas pressure difference between the front and rear ends of the leakage microchannel, i.e. With low pressure side The gas pressure difference; is the pressure on the high pressure side;

[0015] As shown in formula (2)

[0016] (2);

[0017] in, is the average height of the upper and lower contact surfaces of the leakage microchannel; is the inner diameter of the contact area of ​​the outer open W ring, is the outer diameter of the contact area of ​​the outer open W ring; is the dynamic viscosity of the airflow; is the temperature of the outer opening W ring;

[0018] The high pressure chamber is at normal pressure , the low pressure chamber is in negative pressure state , then the gas leakage As shown in formula (3)

[0019] (3);

[0020] in, is the leakage coefficient under the exhaust condition, as shown in formula (4):

[0021] (4).

[0022] Preferably, in step S3, the gas leakage under the inflation condition is The determination method is as follows:

[0023] (5);

[0024] in, is the leakage coefficient under inflation conditions, as shown in formula (6)

[0025] (6)

[0026] The external conditions of the inflation and exhaust conditions are the same, the only difference is the airflow loading method. and The error effect on flow rate is ignored, then as shown in formula (7):

[0027] (7)

[0028] The target flow rate is based on the gas leakage under the pumping condition. And the pressure difference is calculated, that is, as shown in formula (8)

[0029] (8)

[0030] Let the coefficient on the right side is equal to 1, that is ,

[0031] according to , the above formula (8) becomes formula (9)

[0032] (9).

[0033] To achieve the above object, the present invention also provides a W-ring leakage test device under high temperature and high pressure environment, which is used to implement the outer opening W-ring leakage test and the inner opening W-ring leakage test based on the above test method, comprising an upper pressing plate and a lower pressing plate, wherein the upper pressing plate is connected to an upper pressing rod, and a test piece is between the upper pressing plate and the lower pressing plate;

[0034] The tested piece is in close contact with the upper pressing plate and the lower pressing plate to form a columnar cavity, a central hole connecting pipeline is provided on the lower pressing plate, one end of the central hole connecting pipeline is located at the bottom center of the columnar cavity, and the other end of the central hole connecting pipeline is connected to a detection component;

[0035] A safety pad is provided on the upper surface of the lower pressing plate, and the safety pad is located at the bottom edge of the columnar cavity. The lower surface of the lower pressing plate is provided with fan-shaped grooves with uniform intervals, and a heating wire is installed in the fan-shaped grooves.

[0036] Preferably, the upper pressure rod is connected to the upper pressure plate via a ball bolt, and the upper pressure rod is driven to move up and down via a hydraulic cylinder, and the lower pressure plate is fixed on a test bench base.

[0037] Preferably, a thermocouple and a first pressure gauge are provided on the lower pressing plate, the thermocouple is located on the lower surface of the lower pressing plate, and the first pressure gauge is located on the outer side of the tested piece.

[0038] Preferably, the detection component includes a first manifold, a second manifold, a cooler, a mass flow meter, a flow regulating valve and an air extraction and inflation switching valve connected in series in sequence, and the center hole connecting pipeline is located at the end of the air extraction and inflation switching valve and is provided with a vacuum pump and a high-pressure gas source in parallel.

[0039] Preferably, a second pressure gauge is provided on the first manifold, and a vacuum gauge is provided on the second manifold. The second pressure gauge is connected to the center hole connecting pipeline through a second cut-off valve, and the vacuum gauge is connected to the center hole connecting pipeline through a first cut-off valve.

[0040] Therefore, the present invention adopts the above-mentioned external opening W-ring seal leakage testing method and device under high temperature and high pressure environment, and the beneficial effects are as follows:

[0041] The present invention adopts a pressure differential loading method (air extraction) of vacuuming the low-pressure side to realize a pressure differential environment for the leakage channel, replacing the traditional pressure differential loading method (air filling) of filling the high-pressure side with high pressure, that is, using an air extraction device to vacuum the inner side of the outer opening W ring and the pipeline to a negative pressure. , to achieve the pressure difference between the inside and outside of the ring , replace the equivalent external high pressure , normal pressure inside Under the condition of consistent external influencing factors, a gas pressure gauge is used to monitor the working conditions on both sides of the leakage channel, and a mass flow meter is used to measure the gas leakage of the seal, thereby realizing the measurement of gas leakage of W-type sealing rings under higher temperature and higher pressure environments than the traditional inflation loading method. This overcomes the problem that the corrugated ring cannot meet the leakage test under high temperature and high pressure conditions, broadens the working condition magnitude of leakage measurement, and accurately and effectively evaluates the sealing performance.

[0042] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 It is a schematic diagram of a leakage test device for an externally-opened W-ring seal under a high temperature and high pressure environment of the present invention;

[0044] Figure 2 Schematic diagram of an externally open W-ring sealing leakage test method of an externally open W-ring under a high temperature and high pressure environment of the present invention;

[0045] Figure 3 It is a schematic diagram of leakage microchannel parameters of a leakage testing method for an externally opened W-ring seal under a high temperature and high pressure environment of the present invention.

[0046] Reference numerals

[0047] 1. Upper pressure rod; 2. Upper pressure plate; 3. Safety pad; 4. Test piece; 5. Lower pressure plate; 6. Heating wire; 7. Thermocouple; 8. First pressure gauge; 9. Vacuum gauge; 10. First shut-off valve; 11. Center hole connecting pipeline; 12. Second shut-off valve; 13. Second pressure gauge; 14. Cooler; 15. Mass flow meter; 16. Flow regulating valve; 17. Exhaust and charge switching valve; 18. High-pressure gas source; 19. Vacuum pump. DETAILED DESCRIPTION

[0048] The technical solution of the present invention is further described below through the accompanying drawings and embodiments.

[0049] Unless otherwise defined, technical or scientific terms used in the present invention shall have the common meanings understood by one having ordinary skills in the field to which the present invention belongs.

[0050] Embodiment 1

[0051] A W-ring leakage test device under high temperature and high pressure environment, which can be used for high temperature and high pressure leakage measurement test of an externally open W-ring based on the leakage test method of the present invention, and can also be used for high temperature and high pressure leakage measurement test of an internally open W-ring based on the traditional inflation method. The main difference lies in whether an air pump or a high pressure gas source is used.

[0052] like Figure 1 As shown, the device includes an upper pressing plate 2 and a lower pressing plate 5. The upper pressing plate 2 is connected to an upper pressing rod 1. The upper pressing rod 1 is connected to the upper pressing plate 2 by a ball bolt, and the upper pressing rod 1 is driven to move up and down by a hydraulic cylinder. The lower pressing plate 5 is fixed on the base of the test bench (not shown in the figure).

[0053] The test piece 4 is between the upper pressing plate 2 and the lower pressing plate 5. The test piece 4 is in close contact with the upper pressing plate 2 and the lower pressing plate 5 to form a cylindrical cavity. A center hole connecting pipe 11 is opened on the lower pressing plate 5. One end of the center hole connecting pipe 11 is located at the bottom center of the cylindrical cavity, which can be used to extract or fill gas.

[0054] A center hole connecting pipeline 11 is led out from the center hole position of the lower pressing plate 5, and a detection component is connected to the center hole connecting pipeline 11. The detection component includes a first manifold, a second manifold, a cooler 14, a mass flowmeter 15, a flow regulating valve 16 and an exhaust and inflation switching valve 17 connected in series in sequence. The center hole connecting pipeline 11 is located at the end of the exhaust and inflation switching valve 17 and is provided with a vacuum pump 19 and a high-pressure gas source 18 in parallel. A second pressure gauge 13 is provided on the first manifold, and the second pressure gauge 13 is connected to the center hole connecting pipeline 11 through the second cut-off valve 12. The second pressure gauge 13 is used to measure the pressure inside the test piece 4 (cylindrical cavity) under the inflation condition. A vacuum gauge 9 is provided on the second manifold, and the vacuum gauge 9 is connected to the center hole connecting pipeline 11 through the first cut-off valve 10. The vacuum gauge 9 is used to measure the pressure inside the test piece 4 (cylindrical cavity). The functions of the first cut-off valve 10 and the second cut-off valve 12 are to protect the measuring devices on the corresponding first manifold and the second manifold.

[0055] The cooler 14 is located on the pipeline behind the vacuum gauge 9, and is used to cool the airflow and reduce the airflow temperature to the temperature range allowed by the mass flowmeter 15. The mass flowmeter 15 is located on the pipeline behind the cooler 14, and is used to measure the leakage flow. The flow control valve 16 is located on the pipeline behind the mass flowmeter 15, and is used to adjust the flow of exhaust or inflation. The exhaust and inflation switching valve 17 is located on the pipeline behind the flow control valve 16, and is used to switch the exhaust or inflation test conditions. The high-pressure gas source 18 is located at the end of the pipeline, and is used to achieve a high-pressure environment on the inner side (cylindrical cavity) of the test piece 4. The vacuum pump 19 is located at the end of the pipeline and is placed in parallel with the high-pressure gas source 18, and is used to achieve a low-pressure environment on the inner side (cylindrical cavity) of the test piece 4.

[0056] A safety pad 3 is provided on the upper surface of the lower pressing plate 5. The safety pad 3 is located at the bottom edge of the columnar cavity. The safety pad 3 is located on the inner side of the test piece 4 and is placed close to the test piece 4. The lower surface of the lower pressing plate 5 is also provided with fan-shaped grooves with uniform intervals. A heating wire 6 is installed in the fan-shaped groove. The heating wire 6 is used to achieve a high-temperature working environment. The lower pressing plate 5 is also provided with a thermocouple 7 and a first pressure gauge 8. The thermocouple 7 is located in a reserved hole on the lower surface of the lower pressing plate 5 and is used to measure the surface temperature of the test piece 4. The first pressure gauge 8 is located near the outer side of the test piece 4 and is used to measure the ambient pressure.

[0057] Embodiment 2

[0058] A method for testing the leakage of an externally open W-ring under a high temperature and high pressure environment using the device of Example 1. When the upper pressing plate 2 and the lower pressing plate 5 compress the W-ring, a series of gas leakage microchannels are formed on their contact surfaces. The gas passes through these microchannels under the action of the pressure difference, flowing from the side with high pressure to the side with low pressure. The sum of the gas flow through these microchannels is the gas leakage of the seal.

[0059] like Figure 2 As shown, taking the W ring with an outer opening as an example, the gas leaks from the outer side of the ring to the inner side from the upper and lower contact surfaces of the W ring. Ignoring the difference between the upper and lower contact surfaces, it is equivalent to a leaking microchannel. According to the simple sealing ring sealing leakage mass flow calculation formula, the microchannel gas leakage is obtained as:

[0060] ;

[0061] in, is the leakage coefficient related to the environmental conditions.

[0062] ;

[0063] Among them, Figure 3 As shown, is the average height of the upper and lower contact surfaces of the leakage microchannel, and the average height It is related to the roughness of the two contact surfaces; is the inner diameter of the contact area, is the outer diameter of the sealing ring contact area, , It is related to the structural dimensions and materials of the ring and mounting groove; is the W ring temperature; is the dynamic viscosity of the airflow. These parameters are the same for both inflation and exhaust pressure difference generation methods; A is the equivalent flow area; The front and rear end faces of the leakage microchannel (high pressure side , low pressure side ) gas pressure difference, that is, the high pressure side With low pressure side Fluid pressure difference; is the pressure on the high pressure side.

[0064] The pressure difference between the high-pressure chamber and the low-pressure chamber is measured by two pressure difference realization methods: exhaust and inflation. ) corresponds to the gas leakage;

[0065] Under the vacuum condition, the high pressure chamber is at atmospheric pressure (normal pressure ), the low pressure chamber is in negative pressure state (pressure ), gas leakage

[0066] ;

[0067] in, is the leakage coefficient under the exhaust condition,

[0068] ;

[0069] Under the inflation condition, the high pressure chamber is in a high pressure state. , the low pressure chamber is atmospheric pressure ,have

[0070] ;

[0071] in, is the leakage coefficient under inflation conditions,

[0072] ;

[0073] Considering that the external conditions of the inflation and exhaust conditions are the same, the only difference is the airflow loading method, it is considered that the two conditions and The difference is not big, and its influence on the flow error is negligible.

[0074] ;

[0075] The target flow rate can be adjusted according to the calibration conditions. And the pressure difference is converted, that is

[0076] ;

[0077] In particular, if we let the coefficients on the right side is equal to 1, (i.e. ), the above formula becomes

[0078] ;

[0079] Therefore, the exhaust condition (pressure is ) is used to indirectly measure the leakage of the pressure differential loading method under the inflation condition.

[0080] Embodiment 3

[0081] The leakage measurement method for the external open W ring under high temperature and high pressure conditions is as follows:

[0082] Step 1: Test bench preparation. Start the cooler 14, turn on the power to start the test bench, lift the upper pressing plate 2 to the preset position, and confirm that the surface of the lower pressing plate 5 of the test bench base is clean and tidy without foreign matter, and then proceed to the next step.

[0083] Step 2: Check and place the outer open W ring. Check that the outer open W ring is intact in appearance, place the outer open W ring in the center of the lower pressure plate 5 of the test bench base, and place the safety pad 3 close to the inner side of the outer open W ring. After completion, proceed to the next step.

[0084] Step 3: Heating the outer open W ring. Use the thyristor power regulator to adjust the output current and control the heating temperature. After the temperature of the outer open W ring stabilizes, proceed to the next step.

[0085] Step 4: Set the deformation amount. Move the upper pressing plate 2 to the target position, and proceed to the next step after the target position is determined.

[0086] Step 5: Establish pressure difference. Close the second shut-off valve 12, open the first shut-off valve 10, and then start the vacuum pump 19, switch to the exhaust gas path through the exhaust and charge switching valve 17, and establish a preliminary pressure difference between the inner and outer sides of the outer opening W ring. After the pressure difference is stable, proceed to the next step.

[0087] Step 6: Set the pressure difference. According to the test requirements (Corresponding to vacuum chamber pressure ), by adjusting the opening of the flow control valve 16 to control the pressure of the exhaust gas line, observe the readings of the vacuum gauge 9 and the second pressure gauge 13, the pressure difference is close to After the fluctuation is stable within the allowable range, proceed to the next step.

[0088] Step 7: Read and record data. Under the condition of stable exhaust gas pressure, read the reading of mass flow meter 15, which is the leakage flow. , corresponding to high pressure inflation conditions (pressure difference , corresponding to the high pressure side pressure ) Leakage .

[0089] Step 8: Carry out the next set of tests. According to the test requirements, keep other conditions unchanged and adjust the test working temperature to repeat steps 3 and 7, or keep other conditions unchanged and adjust the deformation of the outer opening W ring to repeat steps 4 and 7, or keep other conditions unchanged and adjust the working pressure difference to repeat steps 6 and 7;

[0090] Step 9: End of the test. Turn off the vacuum pump 19, cooler 14, and heating wire 6 in order, lift the upper pressing plate 2, and take it out after the temperature of the outer opening W ring drops to room temperature, turn off the power supply, and tidy up the test bench.

[0091] Embodiment 4

[0092] The leakage measurement method for the inner open W ring under high temperature and high pressure conditions is as follows:

[0093] Step 1: Test bench preparation. Start the cooler 14, turn on the power to start the test bench, lift the upper pressing plate 2 to the preset position, and confirm that the surface of the lower pressing plate 5 of the test bench base is clean and tidy without foreign matter, and then proceed to the next step.

[0094] Step 2: Check and place the inner open W ring. Check that the inner open W ring is intact in appearance, place the inner open W ring in the center of the lower pressure plate 5 of the test bench base, and place the safety pad 3 close to the inner side of the inner open W ring. After completion, proceed to the next step.

[0095] Step 3: Heating the inner open W ring. Use the thyristor power regulator to adjust the output current and control the heating temperature. After the temperature of the inner open W ring stabilizes, proceed to the next step.

[0096] Step 4: Set the deformation amount. Move the upper pressing plate 2 to the target position, and proceed to the next step after the target position is determined.

[0097] Step 5: Establish pressure difference. Close the first shut-off valve 10, open the second shut-off valve 12, and then start the high-pressure gas source 18, switch to the inflation gas path through the air extraction and inflation switching valve 17, and establish a preliminary pressure difference between the inner and outer sides of the inner opening W ring. After the pressure difference is stable, proceed to the next step.

[0098] Step 6: Set the pressure difference. According to the test requirements , by adjusting the opening of the flow control valve 16 to control the pressure of the charging gas circuit, observe the readings of the vacuum gauge 9 and the second pressure gauge 13, and the pressure difference is close to After the fluctuation is stable within the allowable range, proceed to the next step.

[0099] Step 7: Read and record data. Under the condition of stable inflation gas line pressure, read the reading of mass flow meter 15, which is the leakage flow. .

[0100] Step 8: Carry out the next set of tests. According to the test requirements, keep other conditions unchanged and adjust the test working temperature to repeat steps 3 and 7, or keep other conditions unchanged and adjust the deformation of the inner opening W ring to repeat steps 4 and 7, or keep other conditions unchanged and adjust the working pressure difference to repeat steps 6 and 7;

[0101] Step 9: End of the test. Turn off the vacuum pump 19, cooler 14, and heating wire 6 in order, lift the upper pressing plate 2, and take it out after the temperature of the inner opening W ring drops to room temperature, turn off the power supply, and tidy up the test bench.

[0102] Therefore, the present invention adopts the above-mentioned external opening W-ring seal leakage testing method and device under high temperature and high pressure environment to replace the traditional pressure differential loading method of charging the high pressure side with high pressure, thereby avoiding the problem that the corrugated ring cannot meet the leakage test under high temperature and high pressure conditions, and broadens the working condition level of leakage measurement.

[0103] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that they can still modify or replace the technical solution of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of the present invention.

Claims

1. A method for testing the leakage of an externally opened W-ring seal, characterized in that: The following steps are involved: S1. Pressure difference according to test requirements Determine the high pressure outside the open W ring under the target working condition and normal pressure inside ; S2. According to Determine the vacuum pressure on the low pressure side , and measured the gas leakage under the exhaust condition ; S3. According to Calculate the gas leakage under inflation conditions ; Step S1 is specifically: Pressure difference required according to target test conditions Determine the high pressure outside the outer opening W ring and normal pressure inside and the temperature and amount of deformation that needs to be applied; In step S2, the gas leakage under the pumping condition The specific method of determining is: The gas leaks from the upper and lower contact surfaces of the outer opening W ring from the outside of the ring to the inside. Ignoring the difference between the upper and lower contact surfaces, it is equivalent to a leakage microchannel. According to the calculation formula of the simple sealing ring sealing leakage mass flow, the gas leakage of the leakage microchannel is calculated. Q As shown in formula (1) （1） in, is the leakage coefficient related to the environmental conditions; A is the equivalent flow area; is the gas pressure difference between the front and rear ends of the leakage microchannel, i.e. With low pressure side The gas pressure difference; is the pressure on the high pressure side; As shown in formula (2) （3） in, is the average height of the upper and lower contact surfaces of the leakage microchannel; is the inner diameter of the contact area of ​​the outer open W ring, is the outer diameter of the contact area of ​​the outer open W ring; is the dynamic viscosity of the airflow; is the temperature of the outer opening W ring; The high pressure chamber is at normal pressure , the low pressure chamber is in negative pressure state , then the gas leakage As shown in formula (3) （3） in, is the leakage coefficient under the exhaust condition, as shown in formula (4): （4）； In step S3, the gas leakage under the inflation condition The determination method is as follows: （5） in, is the leakage coefficient under inflation conditions, as shown in formula (6) （6） Considering that the external conditions of the inflation and exhaust conditions are the same, the only difference is the airflow loading method, it is considered that the two conditions and The error effect on flow rate is ignored, then as shown in formula (7): （7） The target flow rate is based on the gas leakage under the pumping condition. And the pressure difference is calculated, that is, as shown in formula (8) （8） Let the coefficient on the right side is equal to 1, that is , according to , the above formula (8) becomes formula (9) （9）。 2. An externally open W-ring seal leakage test device, used to implement the externally open W-ring seal leakage test method as claimed in claim 1, characterized in that: It includes an upper pressing plate and a lower pressing plate, wherein the upper pressing plate is connected to an upper pressing rod, and a test piece is between the upper pressing plate and the lower pressing plate; The tested piece is in close contact with the upper pressing plate and the lower pressing plate to form a columnar cavity, a central hole connecting pipeline is provided on the lower pressing plate, one end of the central hole connecting pipeline is located at the bottom center of the columnar cavity, and the other end of the central hole connecting pipeline is connected to a detection component; A safety pad is provided on the upper surface of the lower pressing plate, and the safety pad is located at the bottom edge of the columnar cavity. The lower surface of the lower pressing plate is provided with fan-shaped grooves with uniform intervals, and a heating wire is installed in the fan-shaped grooves.

3. The external opening W-ring seal leakage test device according to claim 2, characterized in that: The upper pressure rod is connected to the upper pressure plate through a ball bolt, and the upper pressure rod is driven to move up and down by a hydraulic cylinder, and the lower pressure plate is fixed on the test bench base.

4. The external open W-ring seal leakage test device according to claim 2, characterized in that: The lower pressing plate is provided with a thermocouple and a first pressure gauge, wherein the thermocouple is located on the lower surface of the lower pressing plate, and the first pressure gauge is located on the outer side of the tested piece.

5. The external open W-ring seal leakage test device according to claim 2, characterized in that: The detection component includes a first manifold, a second manifold, a cooler, a mass flow meter, a flow regulating valve and an air extraction and charging switching valve which are connected in series in sequence. The central hole connecting pipeline is located at the end of the air extraction and charging switching valve and is provided with a vacuum pump and a high-pressure gas source in parallel.

6. The external open W-ring seal leakage test device according to claim 5, characterized in that: A second pressure gauge is provided on the first manifold, and a vacuum gauge is provided on the second manifold. The second pressure gauge is connected to the center hole connecting pipeline through a second cut-off valve, and the vacuum gauge is connected to the center hole connecting pipeline through a first cut-off valve.

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