Sealing ring end face deformation taper in-situ visualization test device with controllable temperature and pressure environment

Abstract

The invention discloses a temperature and pressure environment controllable sealing ring end face deformation taper in-situ visualization test device. The device comprises a sealing cavity assembly, a to-be-tested sealing assembly, an optical test system and an environment regulation and control system. A main sealing cavity is formed in the sealing cavity assembly and used for containing a to-be-tested sealing ring. The optical testing system uses an optical interference principle through a light source, inclined glass, an image collector and a transparent ring, and when light is reflected on the lower end face of the transparent ring and the upper end face of a sealing ring to form interference fringes, the image collector captures fringe images; the environment regulation and control system independently regulates and controls the gas pressure and temperature in the chamber through a pressure regulation and control pipeline and a heating element, and the end face deformation conicity of the sealing ring to be tested in the main sealing chamber under different gas pressure and gas temperature conditions can be obtained by analyzing the change of interference fringes. The device can realize in-situ visual measurement under different temperature and pressure conditions, and has the effects of simplicity and convenience in operation, accuracy in control, improvement of the reliability of a sealing system and the like.

Description

Technical Field

[0001] This invention belongs to the technical field of end face sealing ring deformation performance testing, specifically relating to an in-situ visual test device for end face deformation taper of sealing ring with controllable temperature and pressure environment. Background Technology

[0002] Mechanical seals are critical components in rotating machinery, preventing fluid leakage. Their core is a precision sealing pair formed by the end faces of two rings (a rotating ring and a stationary ring). The deformation state of the sealing ring end faces directly determines the thickness of the liquid film and the pressure distribution between the end faces, making it one of the most critical factors affecting sealing performance. Currently, measuring mechanical seal deformation mainly involves measuring the taper of the sealing ring end faces before and after the experiment. This method requires repeated measurements of the end face deformation before and after the mechanical seal's operation. However, under actual operating conditions, thermal deformation, pressure deformation, and force deformation are coupled and occur simultaneously, making it difficult to separate and quantify their respective effects during operation. Furthermore, the deformation of the sealing ring is an elastic deformation that occurs under specific temperature and pressure conditions. Once the machine is shut down and unloaded, the temperature and pressure return to normal, and the deformation also recovers. Therefore, the plastic deformation or wear measured after the fact is completely different from the elastic deformation during operation. After leaving the operating conditions, the measured results often do not match the deformation under actual operating conditions. The deformation of the mechanical seal end face under operating conditions can often only be "inferred" from the final leakage rate or wear morphology, making it like a "black box." Furthermore, inferring deformation from leakage and wear is result-oriented, lagging, and imprecise, and cannot be used for forward-looking, precise design and fault diagnosis. Summary of the Invention

[0003] To address the aforementioned problems, the present invention aims to provide an in-situ visual test device for the deformation taper of the sealing ring end face with a controllable temperature and pressure environment.

[0004] The specific technical solution is as follows: A temperature and pressure controllable in-situ visualization test device for the end face deformation taper of a sealing ring includes a sealing cavity assembly, a sealing assembly under test, an optical testing system, and an environmental control system. The main sealing chamber is formed inside the sealing cavity assembly; The sealing assembly under test includes a sealing ring under test, which is located in the main sealing chamber; The optical testing system includes a light source, tilted glass, an image acquisition device, and a transparent ring. The transparent ring is located inside the main sealed chamber and directly above the sealing ring under test. When the sealing ring under test deforms, a tilted air film is formed between the two. The light emitted by the light source is reflected by the tilted glass and passes through the transparent ring, and is reflected at the lower end face of the transparent ring and the upper end face of the sealing ring under test, respectively. The two reflected beams interfere to form interference fringes. The image acquisition device is used to acquire the image of the interference fringes and is located above the tilted glass. The environmental control system is used to independently control the gas pressure and gas temperature within the main sealed chamber; By analyzing the changes in interference fringes, the end face deformation taper of the sealing ring under test can be obtained under different gas pressures and temperatures in the main sealing chamber.

[0005] Furthermore, the environmental control system includes a pressure control pipeline and a heating element. The pressure control pipeline is connected to the main sealing chamber and is used to introduce gas and control the gas pressure in the main sealing chamber. The heating element is disposed in or thermally connected to the main sealing chamber and is used to heat the gas in the main sealing chamber to control its temperature.

[0006] Furthermore, the pressure regulation pipeline includes a main sealing chamber air inlet pipeline connected to the main sealing chamber, and a first pressure regulating valve is provided on the main sealing chamber air inlet pipeline.

[0007] Furthermore, the sealing assembly under test also includes a sealing ring seat, the sealing ring under test is mounted on the sealing ring seat, and an auxiliary sealing ring is provided between the sealing ring under test and the sealing ring seat.

[0008] Furthermore, the sealing cavity assembly includes an upper sealing cavity, a lower sealing cavity, an axial load adjustment cavity, a spring, and a spring compression test structure. The upper and lower sealing cavities are connected by bolts and form a main sealing chamber inside them. The axial load adjustment cavity is located in the main sealing cavity and forms an axial load pressure regulating chamber between it and the lower sealing cavity. The sealing assembly under test is mounted on the axial load adjustment cavity by a spring. The spring compression test structure includes a displacement sensor fixedly mounted on the upper sealing cavity and a displacement sensor sensing ring mounted on the axial load adjustment cavity. The change in spring compression can be indirectly obtained through the displacement between the displacement sensor probe and the displacement sensor sensing ring.

[0009] Furthermore, the sealing cavity assembly also includes a clamping structure for clamping and fixing the transparent ring. The clamping structure includes a clamping flange and clamping bolts. The clamping flange is fixed to the upper sealing cavity by the clamping bolts to limit the position of the transparent ring.

[0010] Furthermore, the pressure regulation pipeline also includes a pressure regulating chamber inlet pipeline and a sealed inner cavity exhaust pipeline. The pressure regulating chamber inlet pipeline is connected to the axial load pressure regulating chamber, and a second pressure regulating valve is provided on the pressure regulating chamber inlet pipeline. The sealed inner cavity exhaust pipeline is connected to the main sealed chamber.

[0011] Furthermore, the light source is a sodium light generator, the image acquisition device is a camera, and the heating element is a ring-shaped temperature-controlled heating tube.

[0012] Furthermore, the image acquisition unit and the tilting glass are mounted above the sealed cavity assembly via a support frame.

[0013] The working principle of this invention is as follows: When the end face seal is in operation, the end face of the sealing ring will deform under the influence of pressure and temperature. The amount of deformation is usually on the order of micrometers. After deformation, an inclined air film will be formed between the sealing rings. A very small angle will be formed between the lower surface of the transparent ring and the upper surface of the sealing ring, thus forming an air wedge. When the light from the light source is reflected onto the transparent ring through the inclined glass, the light reflected back from the lower surface of the transparent ring and the upper surface of the sealing ring will interfere. When the optical path difference between the two beams meets a certain condition, they will reinforce each other (bright fringes) or cancel each other out (dark fringes). Therefore, by observing the number of dark fringes, the end face deformation of the sealing ring under a given temperature and pressure condition can be indirectly calculated.

[0014] The beneficial effects of this invention are as follows: 1) By correlating the deformation state of the end face of the sealing system with the number of interference fringes of the transparent ring, the end face deformation of the sealing system under working conditions can be directly and in-situ measured, the failure of the sealing system can be predicted, and the operational reliability of the sealing system can be improved. 2) The working temperature of the end face seal is regulated by the built-in heating tube, and the pressure of the sealing cavity can be controlled by the air inlet pipe, so that the temperature and pressure of the sealing end face can be regulated at the same time, which is convenient to control. 3) By using the commonly used sealing ring as the monitoring object, the spring force can be adjusted by adjusting the pressure in the back cavity of the push ring. This allows for monitoring of the deformation of the sealing ring end face under different working conditions without making significant adjustments to the sealing structure, making the operation convenient. Attached Figure Description

[0015] Figure 1 This is a cross-sectional view of the device of the present invention; Figure 2 This is a schematic diagram of the sealed cavity, the sealing component to be tested, and the pressure regulating pipeline of the device of the present invention; Figure 3 This is a three-dimensional structural diagram of the device of the present invention; Figure 4 This is an exploded schematic diagram of the device of the present invention; Figure 5 This is a schematic diagram of the sealing ring end face deformation taper test principle based on the optical reflection principle of the present invention; Figure 6 This is a diagram showing the relationship between the taper of the sealing ring end face and the number of light strips in this invention; Figure 7 This is a schematic diagram of the sealing assembly to be tested according to the present invention; Figure 8 This is a schematic diagram of the heating element of the present invention.

[0016] In the diagram: 1. Sealing cavity assembly; 11. Upper sealing cavity; 111. Main sealing chamber; 12. Lower sealing cavity; 13. Axial load adjustment cavity; 131. Axial load pressure regulating chamber; 14. Spring; 15. Spring compression test structure; 151. Displacement sensor; 152. Displacement sensor sensing ring; 16. Clamping structure; 161. Clamping flange; 162. Clamping bolt; 2. Sealing assembly under test; 21. Sealing ring under test; 21 1. Inclined air membrane; 22. Sealing ring seat; 221. Auxiliary sealing ring; 3. Optical testing system; 31. Light source; 32. Support frame; 33. Inclined glass; 34. Image acquisition device; 35. Transparent ring; 351. Interference fringes; 4. Pressure regulation pipeline; 41. Main sealing cavity air inlet pipeline; 411. First pressure regulating valve; 42. Pressure regulating chamber air inlet pipeline; 421. Second pressure regulating valve; 43. Sealed inner cavity exhaust pipeline; 5. Heating element. Detailed Implementation

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments, but the scope of protection of the present invention is not limited thereto.

[0018] like Figure 1-4 As shown, a temperature and pressure controllable in-situ visualization test device for the deformation taper of the sealing ring end face includes a sealing cavity assembly 1, a sealing assembly to be tested 2, an optical testing system 3, and an environmental control system.

[0019] The sealing cavity assembly 1 includes an upper sealing cavity 11, a lower sealing cavity 12, an axial load regulating cavity 13, a spring 14, a spring compression testing structure 15, and a clamping structure 16. The upper sealing cavity 11 and the lower sealing cavity 12 are connected by bolts and form a main sealing chamber 111 inside them. The axial load regulating cavity 13 is located in the main sealing chamber 111 and forms an axial load pressure regulating chamber 131 between it and the lower sealing cavity 12. The sealing assembly 2 under test is set on the axial load regulating cavity 13 by the spring 14. The spring compression testing structure 15 includes a displacement sensor 151 fixedly set on the upper sealing cavity 11 and a displacement sensor sensing ring 152 installed on the axial load regulating cavity 13. The change in the compression of the spring 14 can be indirectly obtained by the displacement between the probe of the displacement sensor 151 and the displacement sensor sensing ring 152. The clamping structure 16 includes a clamping flange 161 and a clamping bolt 162. The clamping flange 161 is fixed on the upper sealing cavity 11 by the clamping bolt 162.

[0020] like Figure 7 As shown, the sealing assembly 2 to be tested is located in the main sealing chamber 111, including the sealing ring 21 to be tested and the sealing ring seat 22. The sealing ring 21 to be tested is installed on the sealing ring seat 22, and an auxiliary sealing ring 221 is provided between the sealing ring 21 to be tested and the sealing ring seat 22.

[0021] The optical testing system 3 includes a light source 31, a support frame 32, a tilted glass 33, an image acquisition device 34, and a transparent ring 35. The transparent ring 35 is located inside the main sealed chamber 111 and directly above the sealed ring 21 under test. When the sealed ring 21 under test deforms, a tilted air film 211 is formed between it and the test ring. The image acquisition device 34 and the tilted glass 33 are mounted above the sealed chamber assembly 1 via the support frame 32. The image acquisition device 34 is located above the tilted glass 33, and the distance between the image acquisition device 34 and the tilted glass 33 is adjustable so that the light source 31 can be better reflected through the tilted glass 33. The light source 31 is a sodium light generator, and the image acquisition device 34 is a camera. Figure 5 As shown, the light emitted by the light source 31 is reflected by the inclined glass 33 and passes through the transparent ring 35. It is reflected at the lower end face of the transparent ring 35 and the upper end face of the sealing ring 21 to be tested, respectively. The two reflected beams interfere to form interference fringes 351. The image acquisition device 34 acquires the image of the interference fringes 351 and transmits it to the computer for analysis.

[0022] The environmental control system includes a pressure control pipeline 4 and a heating element 5. The pressure control pipeline 4 includes a main sealing cavity inlet pipeline 41, a pressure regulating chamber inlet pipeline 42, and a sealed inner cavity exhaust pipeline 43. The main sealing cavity inlet pipeline 41 is connected to the main sealing cavity 111 and is equipped with a first pressure regulating valve 411. The gas pressure in the main sealing cavity 111 can be adjusted by the first pressure regulating valve 411 to create different gas environments. The pressure regulating chamber inlet pipeline 42 is connected to the axial load pressure regulating chamber 131 and is equipped with a second pressure regulating valve 421. The pressure in the axial load pressure regulating chamber 131 can be adjusted by the second pressure regulating valve 421 to change the compression of the spring 14. The sealed inner cavity exhaust pipeline 43 is connected to the main sealing cavity 111 and the leakage of the sealing gas is measured by a flow meter. Heating element 5 is disposed within or thermally connected to the main sealing chamber 111, and is used to heat the gas within the main sealing chamber 111 to regulate its temperature. Heating element 5 can be as follows: Figure 8 The annular temperature-regulating heating tube shown can change the gas temperature in the main sealing chamber 111 by adjusting its power, thereby creating sealing chamber environments with different temperatures.

[0023] As pressure and temperature change, the tilt angle of the inclined air membrane 211 also changes. Consequently, the number of interference fringes 351 of the reflected light between the lower surface of the transparent ring 35 and the upper surface of the sealing ring 21 under test will change. This change in the number of interference fringes 351 allows for the measurement of the end-face deformation of the sealing ring 21 under test. By analyzing the changes in the interference fringes 351, the end-face deformation taper of the sealing ring 21 under test under different gas pressures and temperatures within the main sealing chamber 111 can be obtained.

[0024] Example 1

[0025] Using the above-mentioned device, under certain temperature and pressure conditions, such as... Figure 6 As shown, one interference fringe 351 represents a taper of 0.3 μm on the end face. In this embodiment 1, there are 3 interference fringes 351, so the taper of the end face is 0.9 μm.

Claims

1. A temperature and pressure controlled environment-controlled in-situ visual test device for the deformation taper of the sealing ring end face, characterized in that, It includes a sealed cavity assembly (1), a sealed assembly under test (2), an optical testing system (3), and an environmental control system; The sealing cavity assembly (1) forms a main sealing chamber (111); The sealing assembly to be tested (2) includes a sealing ring to be tested (21), which is located in the main sealing chamber (111); The optical testing system (3) includes a light source (31), a tilted glass (33), an image acquisition device (34), and a transparent ring (35). The transparent ring (35) is located in the main sealed chamber (111) and directly above the sealing ring (21) to be tested. When the sealing ring (21) to be tested is deformed, a tilted air film (211) is formed between the transparent ring (35) and the sealing ring (21) to be tested. The light emitted by the light source (31) is reflected by the tilted glass (33) and passes through the transparent ring (35), and is reflected at the lower end face of the transparent ring (35) and the upper end face of the sealing ring (21) to be tested, respectively. The two reflected beams interfere to form interference fringes (351). The image acquisition device (34) is used to acquire the image of the interference fringes (351) and is located above the tilted glass (33). The environmental control system is used to independently control the gas pressure and gas temperature in the main sealed chamber (111); By analyzing the changes in the interference fringes (351), the end face deformation taper of the sealing ring (21) under different gas pressures and gas temperatures in the main sealing chamber (111) can be obtained.

2. The temperature and pressure environment controllable in-situ visual test device for the deformation taper of the sealing ring end face as described in claim 1, characterized in that, The environmental control system includes a pressure control pipeline (4) and a heating element (5). The pressure control pipeline (4) is connected to the main sealing chamber (111) and is used to introduce gas and control the gas pressure in the main sealing chamber (111). The heating element (5) is located in the main sealing chamber (111) or is thermally connected to the main sealing chamber (111) and is used to heat the gas in the main sealing chamber (111) to control its temperature.

3. The temperature and pressure environment controllable in-situ visual test device for the deformation taper of the sealing ring end face as described in claim 2, characterized in that, The pressure regulating pipeline (4) includes a main sealing chamber air inlet pipeline (41) connected to the main sealing chamber (111), and a first pressure regulating valve (411) is provided on the main sealing chamber air inlet pipeline (41).

4. The temperature and pressure environment controllable in-situ visual test device for the deformation taper of the sealing ring end face as described in claim 3, characterized in that, The sealing assembly to be tested (2) also includes a sealing ring seat (22), the sealing ring to be tested (21) is installed on the sealing ring seat (22), and an auxiliary sealing ring (221) is provided between the sealing ring to be tested (21) and the sealing ring seat (22).

5. The temperature and pressure environment controllable in-situ visual test device for the deformation taper of the sealing ring end face as described in claim 4, characterized in that, The sealing cavity assembly (1) includes an upper sealing cavity (11), a lower sealing cavity (12), an axial load regulating cavity (13), a spring (14), and a spring compression test structure (15). The upper sealing cavity (11) and the lower sealing cavity (12) are connected by bolts and form a main sealing chamber (111) inside them. The axial load regulating cavity (13) is located in the main sealing chamber (111) and forms an axial load pressure regulating chamber (131) between it and the lower sealing cavity (12). The sealing assembly (2) to be tested is set on the axial load regulating cavity (13) by the spring (14). The spring compression test structure (15) includes a displacement sensor (151) fixedly set on the upper sealing cavity (11) and a displacement sensor sensing ring (152) installed on the axial load regulating cavity (13). The change in the compression of the spring (14) can be indirectly obtained by the displacement between the probe of the displacement sensor (151) and the displacement sensor sensing ring (152).

6. The temperature and pressure environment controllable in-situ visual test device for the deformation taper of the sealing ring end face as described in claim 5, characterized in that, The sealing cavity assembly (1) also includes a clamping structure (16) for clamping and fixing the transparent ring (35). The clamping structure (16) includes a clamping flange (161) and a clamping bolt (162). The clamping flange (161) is fixed on the upper sealing cavity (11) by the clamping bolt (162) to limit the position of the transparent ring (35).

7. The temperature and pressure environment controllable in-situ visual test device for the deformation taper of the sealing ring end face as described in claim 6, characterized in that, The pressure regulating pipeline (4) also includes a pressure regulating chamber inlet pipeline (42) and a sealed inner cavity exhaust pipeline (43). The pressure regulating chamber inlet pipeline (42) is connected to the axial load pressure regulating chamber (131). A second pressure regulating valve (421) is provided on the pressure regulating chamber inlet pipeline (42). The sealed inner cavity exhaust pipeline (43) is connected to the main sealed chamber (111).

8. The temperature and pressure environment controllable in-situ visual test device for the deformation taper of the sealing ring end face as described in claim 2, characterized in that, The light source (31) is a sodium light generator, the image acquisition device (34) is a camera, and the heating element (5) is a ring-shaped temperature-controlled heating tube.

9. The temperature and pressure environment controllable in-situ visual test device for the deformation taper of the sealing ring end face as described in claim 8, characterized in that, The image acquisition unit (34) and the tilted glass (33) are mounted above the sealed cavity assembly (1) via a support frame (32).

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