Mechanical sealing structure of crawler type self-compensating rubber sealing ring in wide temperature range and strong vibration environment and assembling mode of mechanical sealing structure

Abstract

The invention discloses a mechanical sealing structure of a crawler type self-compensation rubber sealing ring in a wide temperature range and strong vibration environment and an assembling mode of the mechanical sealing structure, the mechanical sealing structure comprises a rotating ring assembly and a floating ring assembly, and the rotating ring assembly comprises a rotating ring, a rotating ring O-shaped ring and a self-centering expansion pad; the floating ring assembly comprises a floating ring, a check ring, a floating ring cover, a wave spring, a push ring and a crawler type self-compensation rubber sealing ring which are assembled in the axial direction. A polygonal structure is adopted for preventing rotation, and angular compensation of the floating ring is met; the crawler-type self-compensating rubber sealing ring can keep a good sealing effect when rubber swells and changes in size, and when elastic force provided by an elastic element is not enough to follow disturbance response, elastic potential energy stored by the crawler-type structure can make up for the insufficient elastic force, and good follow-up performance of the floating ring is achieved. The combined sealing structure meets the requirements of being compact in space and suitable for working conditions such as wide temperature range, strong vibration and large pressure fluctuation.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of mechanical seal, and particularly relates to a mechanical seal structure of a track type self-compensation rubber seal ring for a wide temperature range and a strong vibration environment and an assembly method thereof, and is suitable for equipment with a long sealing working time requirement in a wide temperature range and a strong vibration environment. BACKGROUND

[0002] With continuous breakthroughs in materials and technology, under the requirements of high parameters and long service life, mechanical seals gradually replace traditional contact oil seals in the field of rotating shaft sealing. A typical mechanical seal is composed of a dynamic ring assembly, a floating ring assembly, a compensation elastic element and a secondary sealing element. The working principle of the non-contact mechanical seal is that the rotating ring uses the dynamic pressure effect to form a micron-level fluid film between the rotating ring and the floating ring in a short time, and uses the fluid film to isolate the sealing chamber from the air side to prevent leakage. The non-contact mechanical seal has the advantages of low wear, compact structure and long service life, and is particularly suitable for high-speed and high-pressure environments. Mechanical seals serving in high-parameter process equipment or special equipment will face strong vibration and wide temperature range working environments.

[0003] A strong vibration environment will increase the relative micro-motion between the sealing pairs, making the oil film between the sealing surfaces easy to be damaged, and aggravating friction and wear. The rubber seal ring for static sealing is also prone to micro-cracks due to fatigue or vibration-induced shear stress in this environment, which may cause leakage.

[0004] In a high-temperature environment, the traditional O-shaped rubber ring may be permanently deformed due to the aging of hot oil, resulting in a decrease in the rebound ability and a reduction in the dynamic response performance of the seal.

[0005] Due to insufficient sealing design experience for high-parameter equipment or processing errors, leakage problems that were not found in design and ground tests may occur after installation. These problems are mainly exposed in the subsequent fault analysis, such as processing errors and assembly errors of the rotating ring and the floating ring, the secondary sealing assembly and the compensation elastic element, resulting in that the actual performance of the mechanical seal under actual working conditions does not match the initial design sealing parameters and service life. In view of the above problems, the present application provides a mechanical seal structure of a track type self-compensation rubber seal ring for a wide temperature range and a strong vibration environment and an assembly method thereof, which provides a new design idea for equipment with high-parameter and long-service-life requirements. SUMMARY

[0006] In view of the above problems, the present application provides a mechanical seal structure of a track type self-compensation rubber seal ring for a wide temperature range and a strong vibration environment and an assembly method thereof, which solves the technical problem of overcoming the problems of pressure fluctuation in the sealing chamber, misalignment caused by processing errors of the rotating ring, insufficient rebound effect of the compensation ring, and jamming of the compensation ring after swelling of the secondary sealing element.

[0007] In order to achieve the above object, the technical scheme adopted by the present application is: The mechanical seal structure of the track type self-compensating rubber sealing ring in the face of wide temperature range and strong vibration environment comprises a rotating ring assembly and a floating ring assembly, the rotating ring assembly comprises a rotating ring, a rotating ring O-shaped ring and a self-centering pad, the floating ring assembly comprises a floating ring, a check ring, a floating ring cover, a wave spring, a push ring and a track type self-compensating rubber sealing ring assembled in the axial direction, and a floating ring cover O-shaped ring is further sleeved outside the floating ring cover.

[0008] Further technical scheme, the rotating ring is internally provided with a first groove and a second groove, the rotating ring O-shaped ring is arranged in the first groove, and the self-centering pad is arranged in the second groove, the first groove is arranged at a position away from the end face of the rotating ring, and the second groove is arranged at a position close to the end face of the rotating ring.

[0009] Further technical scheme, the self-centering pad is a corrugated annular structure, has an external main contact surface and an internal inclined surface, the main contact surface is in close contact with the inside of the second groove, and the inclined surface has an included angle of 8-12° with the axial direction, so as to facilitate installation with the main shaft, and the inclined surface is in close contact with the surface of the main shaft during installation of the rotating ring assembly and the rotating shaft.

[0010] Further technical scheme, the floating ring has a floating ring end face, a floating ring bottom surface and a first anti-rotation surface on the side, and the floating ring end face is arranged in close contact with the bottom surface of the rotating ring.

[0011] Further technical scheme, the push ring is a circular annular structure, has a second anti-rotation surface, a push ring inner bottom surface, a push ring outer bottom surface and an auxiliary positioning slope surface between the push ring inner bottom surface and the push ring outer bottom surface, the inner side surface of the push ring is the second anti-rotation surface, the push ring inner bottom surface is a glue bonding surface, the glue bonding surface is used for realizing connection of the push ring and the track type self-compensating rubber sealing ring through glue bonding, and the push ring outer bottom surface is in contact with the wave spring arranged at the bottom of the push ring and serves as an elastic surface of the wave spring.

[0012] Further technical scheme, the track type self-compensating rubber sealing ring comprises an upper end face, a third anti-rotation surface, a medium pressure receiving surface, a bottom surface positioning boss, a glue bonding positioning surface, a positioning boss side surface and a track structure, the upper end face is a close contact surface and is used for close contact with the bottom surface of the floating ring through glue, and the glue bonding positioning surface is used for glue bonding with the push ring inner bottom surface.

[0013] Further technical solutions, the floating ring cover has a cavity inside for accommodating the floating ring, the push ring, the wave spring and the track type self-compensating rubber sealing ring combination structure, the side wall of the cavity is provided with a clamping groove near the edge for installing a check ring, and a bottom groove is arranged at the bottom of the cavity for accommodating a bottom surface positioning boss of the track type self-compensating rubber sealing ring, the size of the bottom groove matches the size of the bottom surface positioning boss, and the track type self-compensating rubber sealing ring is arranged in close contact with the inner wall of the cavity, and a third groove is arranged on the outside of the floating ring cover for installing an O-shaped ring of the floating ring cover.

[0014] Further technical solutions, the second anti-rotation surface is correspondingly arranged with the first anti-rotation surface and the third anti-rotation surface, and all are polygonal inner groove structures, the push ring is fixedly connected with the first anti-rotation surface and the third anti-rotation surface by the polygonal inner groove structure of the second anti-rotation surface, so as to realize the limiting of the floating ring and the track type self-compensating rubber sealing ring.

[0015] Further technical solutions, the rotating ring is made of 9Cr18, and the floating ring is made of an integral graphite material, so that the pair of friction pairs has good grinding effect and is suitable for high linear speed working conditions.

[0016] The application also proposes an assembly method of the mechanical seal structure of the track type self-compensating rubber sealing ring in the wide temperature range and strong vibration environment, which comprises the following steps: S1: check the part structure defects, and clean each part, clean the metal parts with anhydrous ethanol or kerosene, and clean the graphite parts with anhydrous ethanol, so as to avoid that residual kerosene is carbonized at high temperature to scratch the end face; S2: assemble the rotating ring assembly, put the rotating ring O-shaped ring into the first groove in the rotating ring, and install the self-centering gasket into the second groove in the rotating ring, wherein the slope surface of the self-centering gasket faces the end face of the rotating ring in a converging state, and the assembly of the rotating ring assembly is completed; S3: assemble the floating ring assembly: apply the prepared glue to the inner bottom surface of the push ring, and put the track type self-compensating rubber sealing ring into the inner hole of the push ring so that the adhesive positioning surface of the track type self-compensating rubber sealing ring is tightly attached to the inner bottom surface of the push ring; the third anti-rotation surface and the second anti-rotation surface are in interference fit, and the excess glue is wiped off; then the floating ring is pressed in, so that the bottom surface of the floating ring is tightly attached to the upper end surface of the track type self-compensating rubber sealing ring, wherein the first anti-rotation surface and the second anti-rotation surface of the floating ring are in transition fit for convenient disassembly and assembly, and the assembly of the floating ring related components is completed; S4: The wave spring is sleeved into the bottom of the track type self-compensating rubber seal ring and tightly attached to the outer bottom surface of the push ring, and then the above-mentioned integral assembly structure is placed in the floating ring cover, the bottom of the floating ring cover has a bottom groove matched with the bottom surface positioning boss of the track type self-compensating rubber seal ring, and during installation, the bottom surface positioning boss of the track type self-compensating rubber seal ring is attached to the bottom groove, the side wall is pressed in with interference fit, the wave spring is naturally embedded, and the wave spring is checked for whether there is jamming phenomenon, finally, the retaining ring is sleeved into the clamping groove of the floating ring cover to prevent the floating ring related components from being ejected under the action of the wave spring, and the assembly of the floating ring assembly is completed; before installation, the floating ring cover O-ring 7 is clamped into the third groove outside the floating ring cover, which can be further assembled into the outer shell; S5: The floating ring assembly and the rotating ring assembly are installed in the main shaft direction respectively, and the assembly is completed.

[0017] Compared with the prior art, the technical scheme of the present application has the following beneficial effects: 1. The non-contact mechanical seal structure is suitable for high parameters, the floating ring graphite material is M211W, the rotating ring metal material is 9Cr18, the friction pair has good wear resistance, and is suitable for high linear speed working conditions.

[0018] 2. The anti-rotation structure with polygonal cooperation inner buckle ensures the integrity of the graphite static ring and avoids damage to the static ring by hard mechanical structures.

[0019] 3. The track type self-compensating rubber seal ring can change the sealing effect without changing the rubber swelling size, and the additional rebound force is applied to the curved part to offset the axial resistance, and when the rebound force provided by the elastic element wave spring is insufficient to match the disturbance response frequency, the elastic potential energy stored in the track structure is released to assist the response to disturbance, realizing good follow-up of the floating ring and providing sufficient angular compensation range for the compensation ring.

[0020] 4. The self-centering pad ensures the coaxiality of the dynamic ring during work, avoids uneven fluid dynamic pressure support force induced by eccentric installation of the dynamic ring, and further causes the dynamic ring to produce nutation-like instability behavior. Such excitation induced by eccentricity may be coupled with the critical speed or natural frequency of the rotor system, causing the sealing structure to enter a resonance state, which seriously affects the stability and service life of the sealing performance.

[0021] 5. The above assembly method can ensure that the floating ring has a compensation effect and does not jam, and there is no interference phenomenon between the components, and subsequent disassembly is convenient, and the module type can be disassembled, the integral assembly body structure is compact, and the combined sealing structure meets the requirements of space compactness, wide temperature range, strong vibration and large pressure fluctuation. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1is the mechanical seal structure assembly structure schematic diagram (omit the seal ring) of the present application; Figure 2 is the mechanical seal structure assembly structure section view of the present application; Figure 3 is the mechanical seal structure assembly structure axial side view of the present application; Figure 4 is the mechanical seal structure all parts axial explosion view of the present application; Figure 5 is the part schematic diagram of self-centering pad; Figure 6 is the combination assembly diagram of floating ring, push ring and track type self-compensating rubber seal ring; Figure 7 is the floating ring structure explanation schematic diagram; Figure 8 is the push ring structure explanation schematic diagram; Figure 9 is the track type self-compensating rubber seal ring structure explanation schematic diagram; Figure 10 is the track type self-compensating rubber seal ring principle explanation diagram; Figure 11 is the floating ring cover part structure schematic diagram; In the figure: 1, self-centering pad; 11, main contact surface; 12, slope surface; 2, rotating ring O-shaped ring; 3, rotating ring; 31, first recess; 32, second recess; 4, floating ring; 41, floating ring end face; 42, first anti-rotation surface; 43, floating ring bottom surface; 5, check ring; 6, floating ring cover; 61, bottom groove; 62, inner wall of cavity; 63, clamping groove; 64, third recess; 7, floating ring cover O-shaped ring; 8, wave spring; 9, push ring; 91, second anti-rotation surface; 92, push ring outer bottom surface; 93, auxiliary positioning slope surface; 94, push ring inner bottom surface; 10, track type self-compensating rubber seal ring; 101, upper end surface; 102, third anti-rotation surface; 103, medium pressure receiving surface; 104, bottom surface positioning boss; 105, adhesive positioning surface; 106, positioning boss side surface; 107, track structure. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical scheme and advantages of the present application more clear, the technical scheme of the present application will be described in detail below. Obviously, the described embodiments are only some of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0024] Reference Figures 1-4The application discloses a mechanical sealing structure of a track type self-compensating rubber sealing ring facing a wide temperature range and a strong vibration environment, and belongs to the technical field of mechanical sealing devices for high-parameter process equipment.

[0025] The rotating ring 3 is internally provided with a first groove 31 and a second groove 32, the rotating ring O-shaped ring 2 is arranged in the first groove 31, and the self-centering gasket 1 is arranged in the second groove 32, the first groove 31 is arranged at a position away from the end face of the rotating ring 3, and the second groove 32 is arranged at a position close to the end face of the rotating ring 3.

[0026] Referring to Figure 5 The self-centering gasket 1 is a corrugated annular structure, has an external main contact surface 11 and an internal inclined surface 12, the main contact surface 11 is attached to the inside of the second groove 32, the inclined surface 12 has an angle of 8°-12° with the axial direction, the inclined surface 12 is designed to facilitate installation with the main shaft and avoid installation jamming, and the inclined surface 12 is attached to the surface of the main shaft during installation of the rotating ring assembly and the rotating shaft.

[0027] Referring to Figures 6-7 The floating ring 4 has a floating ring end face 41, a floating ring bottom face 43 and a first anti-rotation surface 42 on the side, and the floating ring end face 41 is attached to the bottom face of the rotating ring 3.

[0028] Referring to Figure 8 The expression push ring design structure and design principle are explained. The push ring is a circular annular structure, has a second anti-rotation surface 91, a push ring inner bottom face 94, a push ring outer bottom face 92 and an auxiliary positioning slope surface 93 between the push ring inner bottom face 94 and the push ring outer bottom face 92, the inner side surface of the push ring 9 is the second anti-rotation surface 91, the push ring inner bottom face 94 is a glue bonding surface, used for realizing connection of the push ring 9 and the track type self-compensating rubber sealing ring 10 through glue bonding, and the push ring outer bottom face 92 is in contact with the wave spring 8 arranged at the bottom of the push ring and is a wave spring elastic force surface.

[0029] The auxiliary positioning slope surface 93 is designed to assist the centering and positioning of the wave spring 8 during installation. In the past, the assembly method of the push ring 9 and the wave spring 8 may cause the wave spring 8 to be eccentric after installation, resulting in uneven distribution of the springback force, which may seriously affect the response of the floating ring 4. Therefore, the auxiliary positioning slope surface 93 is used to guide the centering of the wave spring 8 in the depressed state, and the inner diameter structure size of the auxiliary positioning slope surface 93 is smaller than the inner diameter of the wave spring 8 in the free state, so there is no need to worry about crushing the wave spring 8.

[0030] Reference Figure 9 The track type self-compensating rubber sealing ring 10 includes an upper end surface 101, a third anti-rotation surface 102, a medium pressure receiving surface 103, a bottom surface positioning boss 104, a glue positioning surface 105, a positioning boss side surface 106, and a track structure 107. The upper end surface 101 is a fitting surface for fitting with the bottom surface 43 of the floating ring through glue, and the glue positioning surface 105 is used for glue fitting with the inner bottom surface 94 of the push ring.

[0031] Reference Figure 6 The assembly state of the floating ring and the auxiliary assembly is mainly embodied. The second anti-rotation surface 91 is correspondingly arranged with the first anti-rotation surface 42 and the third anti-rotation surface 102, which are all polygonal inner groove structures (12 polygons are selected in the present application, and the remaining number of sides and specific size are related). The second anti-rotation surface 91 wraps the first anti-rotation surface 42 and the third anti-rotation surface 102. The push ring 9 uses the polygonal inner groove structure of the second anti-rotation surface 91 to fix the first anti-rotation surface 42 and the third anti-rotation surface 102, thereby realizing the limiting of the floating ring 4 and the track type self-compensating rubber sealing ring 10. The transmission structure is similar to the connection of two screw rods by a hexagonal nut. The push ring 9 is the nut, and the floating ring 4 and the track type self-compensating rubber sealing ring 10 are the connected parts.

[0032] Reference Figure 11 The floating ring cover 6 has a cavity inside for accommodating the combined structure of the floating ring 4, the push ring 9, the wave spring 8, and the track type self-compensating rubber sealing ring 10. A clamping groove 63 is arranged on the side wall near the edge of the cavity for installing the retaining ring 5. A bottom groove 61 is arranged at the bottom of the cavity for accommodating the bottom surface positioning boss 104 of the track type self-compensating rubber sealing ring 10. The size of the bottom groove matches the size of the bottom surface positioning boss 104. The track structure 107 of the track type self-compensating rubber sealing ring 10 is tightly arranged with the inner wall 62 of the cavity. The track type self-compensating rubber sealing ring 10 is pressed into the floating ring cover 6 through the bottom surface positioning boss 104 at the tail to ensure its fixation in position by assembly stress. A third groove 64 is arranged on the outside of the floating ring cover 6 for installing the floating ring cover O-ring 7.

[0033] The track type self-compensating rubber sealing ring 10 is fixed with the floating ring cover 6, and the floating ring 4 is further fixed by the push ring 9. This structure can satisfy the angular freedom degree of the floating ring 4.

[0034] The material of the rotating ring 3 adopts 9Cr18, and the floating ring 4 adopts an integral graphite material M211W, so that the pair of friction pairs has good grinding effect and is suitable for working conditions of high linear speed.

[0035] Reference Figure 10 The principle of the track type self-compensating rubber sealing ring resisting the pressure pulsation of the rear part of the floating ring is described in detail. As shown in Figure 10 three acting forces are received in total: the elastic force of the wave spring 8, the hydrodynamic pressure opening force of the end face of the floating ring 4 and the liquid pressure of the medium, wherein the medium is derived from the matched structure (lubricating oil of the sealing bearing cavity). Under the conventional working condition, the floating ring 4 is required to have a certain amount of axial and angular micro-motion as a compensating ring, and the O-shaped ring is prone to oil bubble swelling and high-temperature hardening, so the traditional static sealing is not suitable for the sealing of the floating ring 4. The structure is in interference fit with the contact surface of the floating ring 4, the medium pressure receiving surface 103 is used for compensating and micro-motion, and the elastic force of the medium pressure receiving surface 103 can respond to the axial and angular motion without causing the floating ring 4 to be stuck. When the medium pressure receiving surface 103 is subjected to pressure pulsation, the disturbance caused by the pulsation is first transmitted to the medium pressure receiving surface 103 and then to the floating ring 4, so that the damping and vibration isolation effect can be achieved to improve the working stability of the sealing assembly. The track-shaped structure 107 can convert the axial assembly pressure into the sealing pressure along the radial direction in the assembled state by using the characteristics of the track-shaped structure, so that the inner shaft surface where the track-shaped structure 107 is located is tightly fitted with the matched surface of the floating ring cover 6. In the working state, the track-shaped structure 107 is required to have high response to the floating ring 4 compensating ring in the wide temperature range and strong vibration environment. When the medium pressure receiving surface 103 lags in response to the vibration of part of the frequency, the compressed part of the track-shaped structure 107 can release a part of the compression stroke in the axial direction, so as to compensate the disturbance of the floating ring and not affect the static sealing effect of the tail cavity of the floating ring 4. The leakage channels S1 and S2, S1 seal the tail of the floating ring 4 and the air side by the track-shaped structure 107; S2 realizes the static sealing and leakage prevention by combining the upper end surface 101 of the track type self-compensating rubber sealing ring 10 with the floating ring bottom surface 43 through the interference fit of the floating ring 4 and the push ring 9.

[0036] The main sealing assembly adopts a balanced mechanical seal, the balance ratio is close to 1, has good anti-seal medium pressure fluctuation effect, the rotating ring 3 is a dynamic ring, and the floating ring 4 is a static ring.

[0037] The self-centering pad 1 can rise to reduce the assembly error of the dynamic ring in the assembly process and realize the automatic centering function of the dynamic ring in the rotation process of the main shaft under the assembly extrusion force; A track-type self-compensating rubber seal 10 replaces the traditional O-ring as a secondary sealing element behind the floating ring 4. O-rings easily swell, causing their cross-sectional dimensions to exceed the design allowable value, resulting in poor tracking performance of the floating ring 4. The new track-type self-compensating rubber seal 10 converts radial changes caused by the environment into axial changes. When the rebound force provided by the elastic element wave spring 8 is insufficient to match the disturbance response frequency, the elastic potential energy stored in the track structure is released to assist in responding to disturbances, achieving excellent tracking performance for the floating ring 4. The buffer ring area (media pressure receiving surface 103) resists media pressure fluctuations, providing auxiliary support for the floating ring 4, reducing instability and improving the stability margin of the floating ring 4.

[0038] The combined anti-rotation structure employs a dodecagonal structure: the outer ring at the head of the crawler-type self-compensating rubber seal 10, the inner ring of the push ring 9, and the outer ring at the tail of the floating ring 4. These three elements are compressed by the rebound force of the wave spring 8. In a preferred embodiment, the present invention can be further configured to replace a single-layer wave spring with a laminated wave spring, extending its life and ensuring mechanical seal stability.

[0039] according to Figure 4 The exploded diagram of the present invention proposes an assembly method for the mechanical seal structure of the crawler type self-compensating rubber seal ring in a wide temperature range and strong vibration environment, including the following steps: 1) Check the structural defects of the parts and clean each component. Note that metal parts can be cleaned with anhydrous ethanol or kerosene, and graphite parts can be cleaned with anhydrous ethanol to avoid residual kerosene from scratching the end surface due to high temperature coking; 2) Assemble the rotating ring assembly, put the rotating ring O-ring 2 into the first groove 31 inside the rotating ring 3, and install the self-centering expansion pad 1 into the second groove 32 of the rotating ring 3, where the slope surface 12 of the self-centering expansion pad 1 is in a convergent state toward the end face of the rotating ring 3. Be careful not to put it upside down, and complete the assembly of the rotating ring assembly; Note that the self-centering expansion pad 1 is placed in the groove close to the end face of the rotating ring 3, and the rotating shaft O-ring is placed in the groove away from the end face of the rotating ring 3, which can seal the lubricating oil of the input shaft, etc.; During installation, ensure that the main contact surface 11 of the self-centering expansion pad 1 is completely in contact with the wall of the second groove 32, and adjust the width of the second groove 32 to be larger than the width of the self-centering expansion pad 1 and the depth to be smaller than the overall radial height of the self-centering expansion pad 1, to ensure that a circle of protruding expansion pads can be seen in the axial direction after installation, and then install the rotating ring O-ring 2 to complete the assembly of the dynamic ring assembly; 3) Assemble the floating ring assembly: apply the prepared glue to the inner bottom surface 94 of the push ring, and insert the track type self-compensating rubber sealing ring 10 into the inner hole of the push ring 9 so that the adhesive positioning surface 105 of the track type self-compensating rubber sealing ring 10 is tightly attached to the inner bottom surface 94 of the push ring; the third anti-rotation surface 102 and the second anti-rotation surface 91 are in interference fit, and the excess glue is wiped off; then press the floating ring 4 in so that the bottom surface 43 of the floating ring is tightly attached to the upper end surface 101 of the track type self-compensating rubber sealing ring 10, and the first anti-rotation surface 42 of the floating ring 4 and the second anti-rotation surface 91 are in transition fit for easy disassembly and assembly, thereby completing the assembly of the floating ring 4 and related components; the floating ring 4, the push ring 9, the wave spring 8, and the floating ring cover 6 are assembled in the axial direction, and the wave spring 8 provides a closing force and ensures the compensation and floating of the floating ring 4.

[0040] 4) Insert the wave spring 8 into the bottom of the track type self-compensating rubber sealing ring 10 and tightly attach it to the outer bottom surface 92 of the push ring, then place the above-mentioned overall assembly structure into the floating ring cover 6, the bottom groove 61 of the floating ring cover 6 is attached to the bottom surface positioning boss 104 of the track type self-compensating rubber sealing ring 10, the side wall is in interference fit and is pressed in, the wave spring 8 is naturally embedded, a downward pressure is applied, and it is checked whether the wave spring 8 has a rebounding and jamming phenomenon, finally the retaining ring 5 is inserted into the clamping groove 63 of the floating ring cover 6 to prevent the floating ring 4 and related components from being ejected under the action of the wave spring 8, thereby completing the assembly of the floating ring assembly; before installation, the floating ring cover O-ring 7 is clamped into the third groove 64 on the outside of the floating ring cover 6, which can be further assembled into the outer housing.

[0041] 5) Install the floating ring assembly and the rotating ring assembly in the main shaft direction to complete the assembly. In the present application, the rotating ring is a moving ring, and the moving ring assembly is connected to the main shaft through the rotating ring O-ring on the inner diameter and the self-centering expansion pad; the floating ring is a static ring, and the static ring assembly is connected to the outer housing.

[0042] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical scope disclosed in the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A mechanical seal structure of a crawler-type self-compensating rubber seal ring for use in a wide temperature range and strong vibration environment, characterized in that: The invention comprises a rotating ring assembly and a floating ring assembly, wherein the rotating ring assembly comprises a rotating ring (3), a rotating ring O-ring (2) and a self-centering expansion pad (1); the floating ring assembly comprises a floating ring (4), a retaining ring (5), a floating ring cover (6), a wave spring (8), a push ring (9) and a crawler-type self-compensating rubber sealing ring (10) assembled in the axial direction, and a floating ring cover O-ring (7) is also sleeved on the outside of the floating ring cover (6).

2. The mechanical seal structure of the crawler-type self-compensating rubber seal ring facing a wide temperature range and strong vibration environment according to claim 1 is characterized in that: A first groove (31) and a second groove (32) are provided inside the rotating ring (3); a rotating ring O-ring (2) is provided in the first groove (31); a self-centering expansion pad (1) is provided in the second groove (32); the first groove (31) is provided at a position away from the end face of the rotating ring (3); and the second groove (32) is provided at a position close to the end face of the rotating ring (3).

3. The mechanical seal structure of the crawler-type self-compensating rubber seal ring facing a wide temperature range and strong vibration environment according to claim 2 is characterized in that: The self-centering expansion pad (1) is a corrugated annular structure having an outer main contact surface (11) and an inner slope surface (12). The main contact surface (11) is fitted inside the second groove (32). The slope surface (12) has an angle of 8-12° with the axial direction, which is used to facilitate installation with the main shaft. When the rotating ring assembly is installed with the rotating shaft, the slope surface (12) is set close to the surface of the main shaft.

4. The mechanical seal structure of the crawler-type self-compensating rubber seal ring facing a wide temperature range and strong vibration environment according to claim 3 is characterized in that: The floating ring (4) comprises a floating ring end surface (41), a floating ring bottom surface (43), and a first anti-rotation surface (42) on the side; the floating ring end surface (41) is arranged to fit the bottom surface of the rotating ring (3).

5. The mechanical seal structure of the crawler-type self-compensating rubber seal ring facing a wide temperature range and strong vibration environment according to claim 4 is characterized in that: The push ring (9) is a circular ring structure having a second anti-rotation surface (91), an inner bottom surface (94) of the push ring, an outer bottom surface (92) of the push ring, and an auxiliary positioning slope surface (93) between the inner bottom surface (94) and the outer bottom surface (92) of the push ring. The inner side surface of the push ring (9) is the second anti-rotation surface (91), the inner bottom surface (94) of the push ring is an adhesive fitting surface for connecting the push ring (9) and the crawler type self-compensating rubber sealing ring (10) by adhesive bonding, and the outer bottom surface (92) of the push ring contacts a wave spring (8) arranged at the bottom of the push ring and serves as an elastic force action surface of the wave spring.

6. The mechanical seal structure of the crawler-type self-compensating rubber seal ring facing a wide temperature range and strong vibration environment according to claim 5, characterized in that: The crawler-type self-compensating rubber sealing ring (10) comprises an upper end surface (101), a third anti-rotation surface (102), a medium pressure receiving surface (103), a bottom surface positioning boss (104), an adhesive positioning surface (105), a positioning boss side surface (106) and a crawler-shaped structure (107), wherein the upper end surface (101) is a bonding surface for bonding with the bottom surface of the floating ring (43) by adhesive, and the adhesive positioning surface (105) is for bonding with the inner bottom surface (94) of the push ring by adhesive.

7. The mechanical seal structure of the crawler-type self-compensating rubber seal ring facing a wide temperature range and strong vibration environment according to claim 6, characterized in that: The floating ring cover (6) has a cavity inside for accommodating a floating ring (4), a push ring (9), a wave spring (8) and a crawler-type self-compensating rubber sealing ring (10) combined structure. A card groove (63) is provided near the edge of the side wall of the cavity for installing the retaining ring (5). A bottom groove (61) is provided at the bottom of the cavity for accommodating the bottom surface positioning boss (104) of the crawler-type self-compensating rubber sealing ring (10). The size of the bottom groove matches the size of the bottom surface positioning boss (104). The crawler-shaped structure (107) of the crawler-type self-compensating rubber sealing ring (10) is closely arranged on the inner wall (62) of the cavity. A third groove (64) is provided on the outer side of the floating ring cover (6) for installing the floating ring cover O-ring (7).

8. The mechanical seal structure of the crawler-type self-compensating rubber seal ring facing a wide temperature range and strong vibration environment according to claim 7, characterized in that: The second anti-rotation surface (91) is arranged corresponding to the first anti-rotation surface (42) and the third anti-rotation surface (102), and all of them are polygonal inner groove structures. The push ring (9) uses the polygonal inner groove structure of the second anti-rotation surface (91) to connect the first anti-rotation surface (42) and the third anti-rotation surface (102), thereby achieving the limitation of the floating ring (4) and the crawler type self-compensating rubber sealing ring (10).

9. The mechanical seal structure of a crawler-type self-compensating rubber seal ring for use in a wide temperature range and strong vibration environment according to claim 7, characterized in that: The rotating ring (3) is made of 9Cr18, and the floating ring (4) is made of integral graphite material. This pair of friction pairs has a good grinding effect and is suitable for working conditions with high linear speeds.

10. The assembly method of the mechanical seal structure of the crawler type self-compensating rubber seal ring for wide temperature range and strong vibration environment according to claim 7 or 8, characterized in that: The steps include: S1: Check the structural defects of the parts and clean each component. Use anhydrous ethanol or kerosene to clean the metal parts and anhydrous ethanol to clean the graphite parts to avoid residual kerosene from scratching the end surface due to high temperature coking. S2: Assemble the rotating ring assembly, place the rotating ring O-ring (2) into the first groove (31) inside the rotating ring (3), and install the self-centering expansion pad (1) into the second groove (32) of the rotating ring (3), wherein the slope surface (12) of the self-centering expansion pad (1) is in a convergent state toward the end surface of the rotating ring (3), and the assembly of the rotating ring assembly is completed; S3: Assemble the floating ring assembly: Apply the prepared glue to the inner bottom surface (94) of the push ring, insert the crawler type self-compensating rubber seal ring (10) from the inner hole of the push ring (9) so that the adhesive positioning surface (105) of the crawler type self-compensating rubber seal ring (10) is tightly fitted with the inner bottom surface (94) of the push ring; wherein the third anti-rotation surface (102) and the second anti-rotation surface (91) are interference fit, and wipe off the excess glue; then press the floating ring (4) in so that the bottom surface (43) of the floating ring is tightly fitted with the upper end surface (101) of the crawler type self-compensating rubber seal ring (10), wherein the first anti-rotation surface (42) and the second anti-rotation surface (91) of the floating ring (4) are transition fit for easy disassembly and assembly, and the assembly of the relevant components of the floating ring (4) is completed; S4: Insert the wave spring (8) from the bottom of the crawler type self-compensating rubber seal ring (10) and stick it to the outer bottom surface (92) of the push ring, and then put the above-mentioned overall assembly structure into the floating ring cover (6). The bottom of the floating ring cover (6) has a bottom groove (61) that is aligned with the bottom surface positioning boss (104) of the crawler type self-compensating rubber seal ring (10). During installation, the bottom surface positioning boss (104) of the crawler type self-compensating rubber seal ring (10) is fitted with the bottom groove (61), and the side wall is pressed in with an interference fit. The wave spring (8) is naturally embedded, and downward pressure is applied to check whether the wave spring (8) is stuck. Finally, the retaining ring (5) is inserted into the groove (63) of the floating ring cover (6) to prevent the related components of the floating ring (4) from popping out under the action of the wave spring (8), and the floating ring assembly is completed; before installation, the floating ring cover O-ring (7) is inserted into the third groove (64) on the outside of the floating ring cover (6), and it can be further assembled into the outer shell; S5: Install the floating ring assembly and the rotating ring assembly along the main shaft to complete the assembly.

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