An automatic test system and method for mechanical seal end face specific pressure

Abstract

The present invention relates to an automatic test system and method for the face pressure of a mechanical seal. In this system, the stationary ring assembly in the mechanical seal is installed on the test device, and a sealing ring is installed between the stationary ring assembly and the test device. The automatic pressing device can automatically press the sealing ring between the stationary ring assembly and the test device to form a seal; the automatic compression amount adjusting device can drive the force measuring sensor and the test device shafting to move together to achieve the function of automatically adjusting the compression amount of the mechanical seal; the automatic gas distribution device can be connected to the test device through a pipeline to automatically provide gases with different pressures; according to the force received by the force measuring sensor, the force of the mechanical seal under different pressures and different compression amounts is obtained, and then the face pressure is calculated. The present invention greatly improves the automation degree of the test and the test efficiency, and is particularly suitable for the scenario of testing the face pressure of mechanical seals under different compression amounts and different pressures.

Description

Technical Field

[0001] The present invention relates to an automatic test system and method for the end face specific pressure of a mechanical seal, belonging to the technical field of the test of the components of a liquid rocket engine turbine pump. Background Technique

[0002] In a liquid rocket engine, the turbine pump is the "heart" of the liquid rocket, and the mechanical seal can be called the "heart valve". The end face specific pressure characteristic of the mechanical seal can be compared to the opening and closing force of the "heart valve", which is particularly important for the turbine pump of a liquid rocket engine. Excessive end face specific pressure is likely to cause friction heat generation and severe wear. On the contrary, it is likely to cause poor sealing effect and large leakage, and further cause the failure of the mechanical seal function and insufficient thrust.

[0003] The stationary ring assembly and the rotating ring cooperate to form a mechanical seal. The end face specific pressure is the result of the combined action of the spring specific pressure and the pressure in the medium chamber. At present, for the research on the test of the end face specific pressure of the mechanical seal, mainly the compression amount of the stationary ring assembly and the pressure in the medium chamber are manually adjusted. Generally, the stationary ring assembly is installed by bolt connection. During the test, it is necessary to readjust the compression amount of the mechanical seal, and the test device needs to be repeatedly disassembled. The pressure in the medium chamber is adjusted by manually adjusting the pressure reducing valve, resulting in insufficient adjustment accuracy and overshoot phenomena, which not only increases the labor intensity of the staff, but also has a low test efficiency.

[0004] The invention patent "A Measuring Device for the End Face Specific Pressure of a Mechanical Seal for a Liquid Rocket Engine Turbine Pump" (CN202111511755.4) mentions a measuring device for the end face specific pressure of the seal, but mainly uses a mechanical method to adjust the compression amount of the mechanical seal. It is necessary to replace and adjust the shims according to the requirements of the compression amount, with repetitive operations and low test efficiency. Moreover, the compression amount cannot be continuously adjusted during the test, the test function is single, and the pressure adjustment in the medium chamber relies on manual adjustment, which has high requirements for the adjustment speed and accuracy of the personnel. Summary of the Invention

[0005] The technical problem to be solved by the present invention is: to overcome the problems of repetitive operations and low efficiency in the test of the end face specific pressure of the mechanical seal in the prior art, and propose an automatic test system and method that can continuously adjust the compression amount, greatly shortening the test cycle, improving the test efficiency and reducing the cost.

[0006] The technical solution of the present invention is:

[0007] An automatic test system for the end face specific pressure of a mechanical seal includes a base, an automatic compression amount adjustment device, a force measuring sensor, a test device support, a test device, a pressure sensor, a sealing ring, a stationary ring assembly, a gland, an automatic pressing device, a gantry support, a pipeline, an automatic gas distribution device, and a test host computer;

[0008] The test device support and the automatic compression amount adjusting device are both installed on the base. The automatic compression amount adjusting device is inside the test device support; the force measuring sensor is installed on the top of the automatic compression amount adjusting device; the test device is installed on the test device support, and the bottom end of the test device contacts the force measuring sensor; the pressure sensor is installed on the test device and is used to measure the air chamber pressure of the test device; the stationary ring assembly is installed on the top of the test device, and a sealing ring is installed between the stationary ring assembly and the test device; the gland is installed on the stationary ring assembly;

[0009] The gantry support is installed on the base, the automatic pressing device is installed on the gantry support, and one end of the automatic pressing device passes through the gantry support and is connected to the gland; the automatic gas distribution device is outside the gantry support and is connected to the air chamber of the test device through a pipeline;

[0010] The automatic compression amount adjusting device, the force measuring sensor, the pressure sensor, the automatic pressing device, and the automatic gas distribution device are respectively connected to the test host computer.

[0011] Preferably, the test device includes a moving ring, a test device housing, and a test device shaft system; the test device housing is installed on the test device support; the bottom end of the test device shaft system contacts the force measuring sensor, the force measuring sensor is installed on the upper end face of the automatic compression amount adjusting device, the stationary ring assembly and the moving ring are installed on the upper part of the test device shaft system, and the stationary ring assembly is located above the moving ring, and a sealing ring is installed between the stationary ring assembly and the test device housing;

[0012] A cavity is machined inside the test device housing. The test device shaft system can move axially up and down relative to the test device housing. The upper end of the test device shaft system passes through the top of the test device housing. A shoulder is machined circumferentially at the radial contact between the test device shaft system and the test device housing. After the test device shaft system is installed in place, the clearance seal formed by the shoulder and the test device housing and the end face seal formed by the stationary ring assembly and the moving ring together form the air chamber of the test device;

[0013] Preferably, the air chamber pressure of the test device is adjusted by the automatic gas distribution device, and the adjustment range is from 0.05 MPa to 2.5 MPa.

[0014] Preferably, the automatic compression amount adjusting device, the force measuring sensor, the pressure sensor, the automatic pressing device, and the automatic gas distribution device communicate with the test host computer through a bus or wirelessly.

[0015] Preferably, the test host computer controls the automatic compression amount adjusting device to move up and down a specified distance. The movement of the automatic compression amount adjusting device drives the force measuring sensor and the test device shaft system to move together, compresses the stationary ring assembly, and automatically adjusts the mechanical seal compression amount.

[0016] Preferably, the stationary ring assembly is formed by stacking multiple diaphragms. A graphite boss is machined on the side of the stationary ring assembly that contacts the rotating ring. The graphite boss is fixedly connected to the diaphragm through a graphite base.

[0017] The automatic test method for the mechanical seal end face specific pressure implemented by using the system includes:

[0018] The test host computer sends a pressing instruction to the automatic pressing device. After receiving the pressing instruction, the automatic pressing device drives the gland to move downward, contacts the stationary ring assembly, and applies force to the sealing ring to achieve the sealing between the stationary ring assembly and the test device.

[0019] The test host computer calculates the moving distance S of the automatic compression amount adjusting device according to the required compression amount △h of the mechanical seal, and accordingly sends a moving instruction to the automatic compression amount adjusting device to achieve the adjustment of the mechanical seal compression amount. The calculation formula of S is: S = △h + L - H, where H is the free height of the stationary ring assembly and L is the distance from the upper end face of the rotating ring to the upper end face of the test device housing; when S is greater than 0, it moves upward, and when S is less than 0, it moves downward.

[0020] The test host computer sends a gas distribution instruction to the automatic gas distribution device. The automatic gas distribution device distributes gas to the gas chamber of the test device. When the pressure sensor measures that the pressure in the gas chamber is the predetermined value P1, the test host computer sends a stop gas distribution instruction to the automatic gas distribution device, and the automatic gas distribution device stops gas distribution.

[0021] The force value F on the shafting of the test device is measured by a force measuring sensor z , and uploaded to the test host computer;

[0022] The test host computer calculates the mechanical seal end face specific pressure by synthesizing various test parameters.

[0023] The automatic test method for the mechanical seal end face specific pressure implemented by using the system includes:

[0024] The test host computer sends a pressing instruction to the automatic pressing device. After receiving the pressing instruction, the automatic pressing device drives the gland to move downward, contacts the stationary ring assembly, and applies force to the sealing ring to achieve the sealing between the stationary ring assembly and the test device.

[0025] The test host computer sends a reset instruction to the automatic compression amount adjusting device. After receiving the reset instruction, the automatic compression amount adjusting device returns to its initial state.

[0026] The test host computer sends an upward movement instruction to the automatic compression amount adjusting device; the automatic compression amount adjusting device drives the force measuring sensor, the shafting of the test device, and the rotating ring to move upward. When the stationary ring assembly contacts the rotating ring and the value of the force measuring sensor changes, the automatic compression amount adjusting device moves upward by △h again, and △h is the required compression amount of the mechanical seal.

[0027] The test host computer sends a gas distribution instruction to the automatic gas distribution device, and the automatic gas distribution device distributes gas to the test device. When the pressure sensor measures that the pressure in the gas chamber is the predetermined value P1, the test host computer sends a stop gas distribution instruction to the automatic gas distribution device, and the automatic gas distribution device stops gas distribution;

[0028] The force value F on the shafting of the test device is measured by a force sensor z , and uploaded to the test host computer;

[0029] The test host computer calculates the mechanical seal face pressure by synthesizing various test parameters.

[0030] Preferably, the face pressure P c is calculated as follows:

[0031]

[0032] wherein, D2 is the outer diameter of the graphite boss of the stationary ring assembly, D1 is the inner diameter of the graphite boss of the stationary ring assembly; D is the diameter of the shaft shoulder of the shafting of the test device.

[0033] The beneficial effects of the present invention compared with the prior art are:

[0034] (1) By providing an automatic test system that operates through a host computer to automatically compress the stationary ring assembly, automatically distribute gas, and automatically adjust the compression amount, the present invention realizes automatic testing of the face pressure, and solves the problems of repetitive operation, low efficiency, and high cost in testing the mechanical seal face pressure in existing devices and technologies;

[0035] (2) By automatically and precisely adjusting the compression amount of the mechanical seal, the present invention changes the previous method of adjusting the compression amount by installing different adjusting gaskets, and can continuously adjust the compression amount, improving the adjustment efficiency;

[0036] (3) By automatically adjusting the gas pressure in the mechanical seal medium chamber, the present invention changes the previous adjustment method of manually adjusting the pressure reducing valve, improving the automation degree of pressure adjustment. Description of the Drawings

[0037] Figure 1 It is an automatic test system for mechanical seal face pressure. Detailed Embodiment

[0038] The present invention adopts an automated solution, uses an automatic compression device to compress the stationary ring assembly, uses an automatic compression amount adjustment device to adjust the compression amount of the mechanical seal, and uses an automatic gas distribution device to adjust the pressure in the mechanical seal medium chamber, greatly improving the automation degree of the test, shortening the test cycle, and improving the test efficiency.

[0039] Such as Figure 1As shown in the figure, a mechanical seal end face specific pressure automatic test system includes a base 1, an automatic compression amount adjusting device 2, a force measuring sensor 3, a test device support 4, a test device 5, a pressure sensor 6, a sealing ring 7, a stationary ring assembly 8, a gland 9, an automatic pressing device 10, a gantry support 11, a pipeline 12, an automatic gas distribution device 13, and a test upper computer.

[0040] The test device support 4 and the automatic compression amount adjusting device 2 are both installed on the base 1, and the automatic compression amount adjusting device 2 is inside the test device support 4; the force measuring sensor 3 is installed on the top of the automatic compression amount adjusting device 2; the test device 5 is installed on the test device support 4, and the bottom end of the test device 5 contacts the force measuring sensor 3; the pressure sensor 6 is installed on the test device 5 for measuring the air chamber pressure of the test device 5; the stationary ring assembly 8 is installed on the top end of the test device 5, and the sealing ring 7 is installed between the stationary ring assembly 8 and the test device 5; the gland 9 is installed on the stationary ring assembly 8.

[0041] The gantry support 11 is installed on the base 1, the automatic pressing device 10 is installed on the gantry support 11, and one end of the automatic pressing device 10 passes through the gantry support 11 and is connected to the gland 9; the automatic gas distribution device 13 is outside the gantry support 11 and is connected to the air chamber of the test device 5 through the pipeline 12.

[0042] The automatic compression amount adjusting device 2, the force measuring sensor 3, the pressure sensor 6, the automatic pressing device 10, and the automatic gas distribution device 13 are respectively connected to the test upper computer.

[0043] The test device 5 includes a rotating ring 501, a test device housing 502, and a test device shafting 503; the test device housing 502 is installed on the test device support 4; the test device shafting 503 contacts the force measuring sensor 3, and the force measuring sensor 3 is installed on the upper end face of the automatic compression amount adjusting device 2; the stationary ring assembly 8 and the rotating ring 501 are installed on the upper part of the test device shafting 503, and the stationary ring assembly 8 is located above the rotating ring 501, and the sealing ring 7 is installed between the stationary ring assembly 8 and the test device housing 502.

[0044] A cavity is machined inside the test device housing 502, the test device shafting 503 passes through the test device housing 502 and can move axially up and down relative to the test device housing 502, and the upper end passes through the top end of the test device housing. A shoulder is machined circumferentially at the radial contact position between the test device shafting 503 and the test device housing 502. After being installed in place, the small clearance seal formed by the shoulder and the test device housing 502 and the end face seal formed by the stationary ring assembly 8 and the rotating ring 501 together form the air chamber of the test device.

[0045] The air chamber pressure of the test device 5 is adjusted by the automatic gas distribution device 13, and the adjustment range is from 0.05 MPa to 2.5 MPa.

[0046] The automatic compression amount adjusting device 2, the force measuring sensor 3, the pressure sensor 6, the automatic pressing device 10, and the automatic gas distribution device 13 communicate with the upper computer for testing through a bus or wirelessly.

[0047] The upper computer for testing sends an instruction to control the automatic pressing device 10 to descend a specified distance.

[0048] The upper computer for testing sends a moving instruction to control the automatic compression amount adjusting device 2 to move up and down a specified distance, driving the force measuring sensor 3 and the test device shafting 503 to move together, compressing the stationary ring assembly 8, and automatically adjusting the mechanical seal compression amount.

[0049] The stationary ring assembly is formed by stacking multiple diaphragms. A graphite boss is machined on the side of the stationary ring assembly that contacts the moving ring, and the graphite boss is fixedly connected to the diaphragm through a graphite base.

[0050] A method for automatically testing the face pressure of a mechanical seal includes:

[0051] The upper computer for testing sends a pressing instruction to the automatic pressing device 10. After receiving the instruction, the automatic pressing device 10 drives the gland 9 to move downward, contacts the stationary ring assembly 8, and applies a force to the sealing ring 7 to achieve the sealing between the stationary ring assembly 8 and the test device 5;

[0052] The upper computer for testing calculates the moving distance S of the automatic compression amount adjusting device 2 according to the required compression amount △h of the mechanical seal, and accordingly sends a moving instruction to the automatic compression amount adjusting device 2 to achieve the adjustment of the mechanical seal compression amount; the calculation formula for S is: S = △h + L - H, where H is the free height of the stationary ring assembly 8 and L is the distance from the upper end face of the moving ring 501 to the upper end face of the test device housing 502; when S is greater than 0, it moves upward, and when S is less than 0, it moves downward;

[0053] The upper computer for testing sends a gas distribution instruction to the automatic gas distribution device 13 to distribute gas to the gas chamber of the test device 5. When the pressure sensor 6 measures that the pressure in the gas chamber is the predetermined value P1, the upper computer for testing sends a stop gas distribution instruction to the automatic gas distribution device 13, and the automatic gas distribution device 13 stops gas distribution;

[0054] The force value F of the test device shafting is measured by the force measuring sensor 3 z , and uploaded to the upper computer for testing;

[0055] The upper computer for testing calculates the face pressure of the mechanical seal by integrating various test parameters.

[0056] Another method for automatically testing the face pressure of a mechanical seal includes:

[0057] The test host computer sends a pressing instruction to the automatic pressing device 10. After receiving the instruction, the automatic pressing device 10 drives the gland 9 to move downward, contacts the stationary ring assembly 8, and applies force to the sealing ring 7 to achieve the sealing between the stationary ring assembly 8 and the test device 5.

[0058] The test host computer controls the automatic compression amount adjusting device 2 to return to the initial state; the test host computer sends an upward movement instruction to the automatic compression amount adjusting device 2; the automatic compression amount adjusting device 2 drives the force measuring sensor 3, the test device shafting 503, and the moving ring 501 to move upward; when the stationary ring assembly 8 contacts the moving ring 501 and causes the value of the force measuring sensor 3 to change, the automatic compression amount adjusting device 2 moves upward by △h again, and △h is the compression amount required for the mechanical seal.

[0059] The test host computer sends a gas distribution instruction to the automatic gas distribution device 13 to distribute gas to the test device. When the pressure sensor 6 measures that the pressure in the gas chamber is the predetermined value P1, the test host computer sends a stop gas distribution instruction to the automatic gas distribution device 13, and the automatic gas distribution device 13 stops gas distribution.

[0060] The force value F on the test device shafting is measured by the force measuring sensor 3 z , and uploaded to the test host computer.

[0061] The test host computer calculates the mechanical seal face pressure based on various test parameters.

[0062] The face pressure P c The calculation method is as follows:

[0063]

[0064] Among them, D2 is the outer diameter of the graphite boss of the stationary ring assembly, D1 is the inner diameter; D is the diameter end of the sealing cavity formed by the cooperation of the test device shafting and the device.

[0065] Example:

[0066] See Figure 1 A mechanical seal face pressure automatic test system shown includes a base 1, an automatic compression amount adjusting device 2, a force measuring sensor 3, a test device bracket 4, a test device 5, a pressure sensor 6, a sealing ring 7, a stationary ring assembly 8, a gland 9, an automatic pressing device 10, a gantry bracket 11, a pipeline 12, and an automatic gas distribution device 13.

[0067] The test device 5 includes a moving ring 501, a test device housing 502, and a test device shafting 503.

[0068] Install the automatic compression amount adjusting device 2 on the base 1, and install the force measuring sensor 3 on the automatic compression amount adjusting device 2.

[0069] Install the test device bracket 4 onto the base 1, install the test device housing 502 onto the test device bracket 4, install the moving ring 501 onto the test device shafting 503, insert the test device shafting 503 into the test device housing 502 and make contact with the force measuring sensor 3.

[0070] Install the sealing ring 7 onto the test device 5, install the stationary ring assembly 8 onto the test device 5 and make contact with the sealing ring 7.

[0071] Install the gantry bracket 11 onto the base 1, install the automatic pressing device 10 on the gantry bracket 11, connect the gland 9 to the automatic pressing device 10 and it can make contact with the stationary ring assembly 8.

[0072] Install the pressure sensor 6 onto the test device 5, connect the automatic gas distribution device 13 and the test device 5 through the pipeline 12.

[0073] The test method 1 is as follows:

[0074] Measure the free height of the stationary ring assembly 8 and measure the distance from the upper end face of the moving ring 501 to the installation surface of the stationary ring assembly 8.

[0075] The automatic pressing device 10 drives the gland 9 to move downward, makes contact with the stationary ring assembly 8 and applies force to the sealing ring, achieving the sealing effect between the stationary ring assembly 8 and the test device 5.

[0076] According to the compression amount required for the mechanical seal, the compression amount adjusting device 2 can move up and down to achieve precise adjustment of the mechanical seal compression amount.

[0077] The automatic gas distribution device 13 can automatically adjust the gas pressure inside the test device according to the test requirements and use the pressure sensor 6 as high-precision adjustment feedback.

[0078] Measure the force value on the test device shafting through the force measuring sensor 3.

[0079] During the test, the mechanical seal compression amount can be adjusted through the automatic compression amount adjusting device 2, and the ambient pressure of the mechanical seal can be adjusted through the automatic gas distribution device 13, so as to achieve the setting of various different test parameters, measure the force value on the test device shafting under each parameter through the force measuring sensor 3, and further obtain the characteristics of the face pressure.

[0080] The test method 2 is as follows:

[0081] Install the stationary ring assembly 8 on the test device 5, the automatic pressing device 10 drives the gland 9 to move downward, makes contact with the stationary ring assembly 8 and applies force to the sealing ring, achieving the sealing effect between the stationary ring assembly 8 and the test device 5.

[0082] The automatic compression amount adjusting device 2 moves upward from the lowest point. When the value measured by the force sensor 3 changes (when the stationary ring assembly just contacts the rotating ring), it is defined as the zero point of the compression amount of the stationary ring assembly. The automatic compression amount adjusting device 2 continues to move upward, and the distance of further upward movement is the compression amount of the mechanical seal, achieving precise adjustment of the compression amount of the mechanical seal.

[0083] The automatic gas distribution device 13 can automatically adjust the gas pressure in the test device according to the test requirements and uses the pressure sensor 6 as a high-precision adjustment feedback.

[0084] The force value of the shafting of the test device is measured by the force sensor 3.

[0085] During the test, the compression amount of the mechanical seal can be adjusted by the automatic compression amount adjusting device 2, and the ambient pressure of the mechanical seal can be adjusted by the automatic gas distribution device 13, so that various different test parameters can be set. The force value of the shafting of the test device under each parameter is measured by the force sensor 3, and then the characteristics of the face pressure are obtained. It should be noted that the automatic compression amount adjusting device 2, the automatic clamping device 10, and the automatic gas distribution device 13 can select structures or schemes with different precisions, different adjustment methods, or different motion methods according to the test requirements.

[0086] It should be particularly pointed out that the test device support 4 and the gantry support 11 are only one of the ways to provide support, and can be adaptively changed according to the specific test structure.

[0087] In the mechanical seal of the present invention, the stationary ring assembly is installed on the test device, and a sealing ring is installed between the stationary ring assembly and the test device. The automatic clamping device can automatically clamp the sealing ring between the stationary ring assembly and the test device to form a seal; the automatic compression amount adjusting device can drive the force sensor and the shafting of the test device to move together to achieve the function of automatically adjusting the compression amount of the mechanical seal; the automatic gas distribution device can be connected to the test device through a pipeline to automatically provide gases with different pressures; according to the force received by the force sensor, the force of the mechanical seal under different pressures and different compression amounts is obtained, and then the face pressure is calculated. The present invention can continuously adjust the compression amount, greatly improving the automation degree of the test, improving the test efficiency and reducing the cost, and is particularly suitable for the scenario of testing the face pressure of mechanical seals under different compression amounts and different pressures.

[0088] The parts not described in detail in the present invention belong to the common general knowledge of those skilled in the art.

Claims

1. An automatic test system for the face pressure of a mechanical seal, characterized in that: It includes a base (1), an automatic compression amount adjusting device (2), a force measuring sensor (3), a test device support (4), a test device (5), a pressure sensor (6), a sealing ring (7), a stationary ring assembly (8), a gland (9), an automatic pressing device (10), a gantry support (11), a pipeline (12), an automatic gas distribution device (13), and a test upper computer; The test device support (4) and the automatic compression amount adjusting device (2) are both installed on the base (1), and the automatic compression amount adjusting device (2) is inside the test device support (4); the force measuring sensor (3) is installed on the top of the automatic compression amount adjusting device (2); the test device (5) is installed on the test device support (4), and the bottom end of the test device (5) contacts the force measuring sensor (3); the pressure sensor (6) is installed on the test device (5) for measuring the air chamber pressure of the test device (5); the stationary ring assembly (8) is installed on the top of the test device (5), and a sealing ring (7) is installed between the stationary ring assembly (8) and the test device (5); the gland (9) is installed on the stationary ring assembly (8); The gantry support (11) is installed on the base (1), the automatic pressing device (10) is installed on the gantry support (11), and one end of the automatic pressing device (10) passes through the gantry support (11) and is connected to the gland (9); the automatic gas distribution device (13) is outside the gantry support (11) and is connected to the air chamber of the test device (5) through the pipeline (12); The automatic compression amount adjusting device (2), the force measuring sensor (3), the pressure sensor (6), the automatic pressing device (10), and the automatic gas distribution device (13) are respectively connected to the test upper computer.

2. The automatic test system for the face pressure of a mechanical seal according to claim 1, characterized in that: The test device (5) includes a moving ring (501), a test device housing (502), and a test device shafting (503); the test device housing (502) is installed on the test device support (4); the bottom end of the test device shafting (503) contacts the force measuring sensor (3), the force measuring sensor (3) is installed on the upper end face of the automatic compression amount adjusting device (2), the stationary ring assembly (8) and the moving ring (501) are installed on the upper part of the test device shafting (503), and the stationary ring assembly (8) is located above the moving ring (501), and a sealing ring (7) is installed between the stationary ring assembly (8) and the test device housing (502); A cavity is machined inside the test device housing (502), the test device shafting (503) can move axially up and down relative to the test device housing (502), the upper end of the test device shafting (503) passes through the top of the test device housing, a shoulder is machined circumferentially at the radial contact position between the test device shafting (503) and the test device housing (502), after the test device shafting (503) is installed in place, the clearance seal formed by the shoulder and the test device housing (502) and the end face seal formed by the stationary ring assembly (8) and the moving ring (501) together form the air chamber of the test device.

3. The automatic test system for the face pressure of a mechanical seal according to claim 2, characterized in that: The air chamber pressure of the test device (5) is adjusted by the automatic gas distribution device (13), and the adjustment range is from 0.05 MPa to 2.5 MPa.

4. The automatic test system for the face pressure of a mechanical seal according to claim 2, characterized in that: The automatic compression amount adjusting device (2), the force measuring sensor (3), the pressure sensor (6), the automatic clamping device (10), and the automatic gas distribution device (13) communicate with the upper computer for testing through a bus or wirelessly.

5. The automatic test system for the face pressure of a mechanical seal according to claim 2, characterized in that: The upper computer for testing controls the automatic compression amount adjusting device (2) to move up and down by a specified distance. The movement of the automatic compression amount adjusting device (2) drives the force measuring sensor (3) and the test device shafting (503) to move together, compressing the stationary ring assembly (8) to automatically adjust the mechanical seal compression amount.

6. The automatic test system for the face pressure of a mechanical seal according to claim 2, characterized in that: The stationary ring assembly is formed by stacking multiple diaphragms. A graphite boss is machined on the side of the stationary ring assembly that contacts the moving ring, and the graphite boss is fixedly connected to the diaphragm through a graphite base.

7. An automatic test method for the face pressure of a mechanical seal implemented by using the system according to any one of claims 2-6, characterized in that Including: The upper computer for testing sends a clamping instruction to the automatic clamping device (10). After receiving the clamping instruction, the automatic clamping device (10) drives the gland (9) to move downward, contacts the stationary ring assembly (8), and applies force to the sealing ring (7) to achieve the sealing between the stationary ring assembly (8) and the test device (5). The upper computer for testing calculates the distance S that the automatic compression amount adjusting device (2) moves according to the required compression amount △h of the mechanical seal, and sends a movement instruction to the automatic compression amount adjusting device (2) accordingly to adjust the mechanical seal compression amount. The calculation formula for S is: S = △h + L - H, where H is the free height of the stationary ring assembly (8), and L is the distance from the upper end face of the moving ring (501) to the upper end face of the test device housing (502); when S is greater than 0, it moves upward, and when S is less than 0, it moves downward. The upper computer for testing sends a gas distribution instruction to the automatic gas distribution device (13). The automatic gas distribution device (13) distributes gas to the gas chamber of the test device (5). When the pressure sensor (6) measures that the pressure in the gas chamber is the predetermined value P1, the upper computer for testing sends a stop gas distribution instruction to the automatic gas distribution device (13), and the automatic gas distribution device (13) stops gas distribution. The force value F of the test device shafting (503) is measured by the force sensor (3) z and uploaded to the upper computer for testing; The upper computer for testing calculates the mechanical seal face pressure by synthesizing various test parameters.

8. An automatic test method for the face pressure of a mechanical seal implemented by using the system according to any one of claims 2-6, characterized in that Including: The upper computer for testing sends a clamping instruction to the automatic clamping device (10). After receiving the clamping instruction, the automatic clamping device (10) drives the gland (9) to move downward, contacts the stationary ring assembly (8), and applies force to the sealing ring (7) to achieve the sealing between the stationary ring assembly (8) and the test device (5). The upper computer for testing sends a reset instruction to the automatic compression amount adjusting device (2). After receiving the reset instruction, the automatic compression amount adjusting device (2) returns to its initial state. The upper computer for testing sends an upward movement instruction to the automatic compression amount adjusting device (2). The automatic compression amount adjusting device (2) drives the force measuring sensor (3), the test device shafting (503), and the moving ring (501) to move upward. When the stationary ring assembly (8) contacts the moving ring (501) and causes the value of the force measuring sensor (3) to change, the automatic compression amount adjusting device (2) moves upward by △h, and △h is the required compression amount of the mechanical seal. The test host computer sends a gas distribution instruction to the automatic gas distribution device (13), and the automatic gas distribution device (13) distributes gas to the test device. When the pressure sensor (6) measures that the pressure in the gas chamber is the predetermined value P1, the test host computer sends a stop gas distribution instruction to the automatic gas distribution device (13), and the automatic gas distribution device (13) stops gas distribution; The force value F on the shafting of the test device is measured by the force sensor (3). z It is uploaded to the upper computer for testing. The test host computer calculates the mechanical seal end face specific pressure based on various test parameters.

9. The automatic test method for the face pressure of a mechanical seal according to claim 7 or 8, characterized in that, End face specific pressure P c The calculation method is as follows: Among them, D2 is the outer diameter of the graphite boss of the stationary ring assembly, D1 is the inner diameter of the graphite boss of the stationary ring assembly; D is the diameter of the shaft shoulder of the test device shafting.

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