Mechanical seal device with anti-interference and self-temperature adjustment

Abstract

This utility model relates to the field of mechanical seal technology, specifically a mechanical seal device with anti-shaft movement, interference resistance, and self-regulating temperature control. It includes a heat exchange inner sleeve, a shaft sleeve, rotating ring A, rotating ring B, two stationary rings, a sealing gland, a spring, a spring seat, a push ring, a transmission key, a standard transmission pin A, a clamping mechanism, and an O-ring assembly. The clamping mechanism consists of clamping disc A, a clamping ring, and clamping disc B. The distance between the two sealing rings remains constant, and the thrust on the end face of the sealing friction ring remains constant. Unaffected by pump shaft movement, the front moving and stationary rings do not require sealing, serving to block liquid flow impact and fluctuations. This ensures the safe and stable operation of the sealing rings, guaranteeing satisfactory performance and ideal service life of the mechanical seal during deep peak-shaving operation of the unit.

Description

Technical Field

[0001] This utility model relates to the field of mechanical seal technology, specifically to a mechanical seal device that is resistant to shaft movement, anti-interference, and has independent temperature regulation. Background Technology

[0002] With economic development and social progress, prioritizing the use of green energy has become a social consensus. Green energy sources such as photovoltaic, wind power, and hydropower are developing rapidly. This has led to traditional thermal power plants being relegated to a regulatory and safeguarding role. At the national level, policies have been introduced to encourage deep peak-shaving power generation from thermal power plants. However, peak-shaving in thermal power plants inevitably results in the rotating equipment responsible for fluid transport in the entire circulation system not operating smoothly. Sudden drops and rises in operating parameters such as rotational speed and pressure frequently occur. This leads to severe oscillations in the internal fluid of the rotating equipment, causing even more serious disturbances to the mechanical seals at the shaft end. Specifically, in the case of the feedwater pump's booster pump, a reciprocating motion of 3-4 mm shaft runout has occurred. This causes significant damage to the mechanical seals, resulting in shorter periods of leak-free operation, operation with minor leaks, and pump shutdown for repair and replacement when leaks are significant.

[0003] In order to meet the national policy requirements of prioritizing green energy, ensuring safety, and deep peak shaving of generator sets, we have developed this new type of mechanical seal device that is resistant to shaft movement, disturbance, and self-regulating temperature. Utility Model Content

[0004] To address the problems in the existing technology, this utility model provides a mechanical seal device that is resistant to shaft movement, anti-interference, and has self-regulating temperature.

[0005] The technical solution adopted by this utility model to solve its technical problem is a mechanical seal device with anti-axial movement, anti-interference, and self-regulating temperature control, including a heat exchange inner sleeve, a bushing, rotating ring A, rotating ring B, two stationary rings, a sealing gland, a spring, a spring seat, a push ring, a transmission key, a standard transmission pin A, a clamping mechanism, and an O-ring assembly; the clamping mechanism consists of a clamping disc A, a clamping ring, and a clamping disc B; the O-ring assembly includes O-ring 1, O-ring 2, O-ring 3, O-ring 4, O-ring 5, and O-ring 6; the device as a whole has a double-end-face balanced structure, and all sealing components are wrapped in the heat exchange inner sleeve. The protective and heat-insulating shell is composed of a sleeve and a sealing cover; the rotating ring A and rotating ring B are in close contact with the end faces of the two stationary rings to form a dynamic and static sealing pair; the bushing is fastened to the pump shaft by a clamping mechanism, the bushing is connected to the spring seat by a transmission key, the spring seat is connected to the push ring by a standard transmission pin A, the push ring is provided with an R-shaped protrusion, and the R-shaped protrusion cooperates with the rotating ring A and rotating ring B to achieve drive; the spring is set between the spring seat and the push ring; the sealing cover is provided with an exhaust valve, and the sealing cover is connected to the pump cover by a bolt assembly composed of an elastic washer, a hexagonal nut, and bolts.

[0006] By adopting the above technical solution, the sealing gland is connected to the pump cover by a bolt assembly consisting of an elastic washer, a hexagonal nut, and bolts. The elastic washer can buffer the installation stress and prevent the sealing gland from deforming due to excessive tightness during installation, thus ensuring the assembly accuracy of the sealing components. The exhaust valve can promptly discharge air from the sealing chamber, preventing air stagnation from causing dry friction on the sealing surface or forming air resistance that affects the sealing performance, thereby improving the stability of the device during startup and operation.

[0007] Specifically, the heat exchange inner sleeve and the sealing cover enclose to form a closed labyrinth cooling mechanism, which is attached to the outer periphery of rotating ring A, rotating ring B and two stationary rings; low-pressure demineralized water is introduced into the closed labyrinth cooling mechanism to form a circulating cooling channel, which is used to control the temperature in the sealed chamber at 30~70℃.

[0008] By adopting the above technical solution, the closed labyrinth cooling mechanism, which fits closely to the outer circumference of the rotating and stationary rings, can directly cool the sealing pair. Furthermore, the design of the low-pressure demineralized water circulation channel allows for stable temperature control of the sealing chamber within the range of 30~70℃ by adjusting the circulating water flow rate or temperature. This temperature range avoids both excessively high temperatures that could lead to aging and failure of sealing components such as O-rings and accelerated wear of the sealing surface, and excessively low temperatures that could cause medium crystallization and blockage of the sealing gap. This ensures the temperature adaptability of the sealing device under different operating conditions, extends the service life of the sealing components, and improves the operational reliability of the device.

[0009] Specifically, the spring seat and the bushing have a sliding fit structure, and the spring seat can move freely in both directions along the axial direction of the bushing to keep the thrust of the spring on the push ring stable when the pump shaft moves.

[0010] By adopting the above technical solution, the interference of pump shaft axial movement is effectively resisted, ensuring stable sealing pressure: the sliding fit structure between the spring seat and the bushing allows the spring seat to move freely in both directions along the axial direction. When the pump shaft moves axially, the spring seat can move synchronously with the direction of shaft movement, avoiding excessive compression or stretching of the spring due to shaft movement, thus maintaining a stable thrust force exerted by the spring on the push ring. Stable thrust ensures that the sealing surfaces of the rotating ring and the stationary ring always maintain a uniform and appropriate sealing pressure, preventing overheating and wear of the sealing surface due to excessive sealing pressure, or leakage of the sealing gap due to insufficient sealing pressure, significantly improving the adaptability of the device to shaft movement conditions and reducing the impact of shaft movement on sealing performance.

[0011] Specifically, an O-ring four is provided between the rotating ring and the bushing to form a sliding dynamic seal; an O-ring one is provided between the stationary ring and the sealing gland to form a static seal; an O-ring six is ​​provided between the bushing and the pump shaft; and an O-ring three is provided between the sealing gland and the pump cover to prevent fluid leakage.

[0012] By adopting the above technical solution, the O-rings between the rotating ring and the bushing form a sliding dynamic seal, which can not only adapt to the rotation and slight axial slippage of the rotating ring, but also prevent the fluid in the sealing chamber from leaking along the gap between the rotating ring and the bushing. The O-ring between the stationary ring and the sealing gland forms a static seal, preventing fluid leakage along the fixed gap between the stationary ring and the sealing gland; The O-ring six-sleeve and the pump shaft are sealed together, and the O-ring three-seal gland and the pump cover are sealed together, respectively, to block the fit clearance between the sleeve and the shaft and between the seal gland and the pump cover, thereby further cutting off the fluid leakage path.

[0013] Specifically, the sealing cap is provided with an anti-rotation pin, which engages with the stationary ring to restrict the stationary ring from rotating synchronously with rotating ring A and rotating ring B, thereby stopping the stationary ring.

[0014] By adopting the above technical solution, the locking engagement between the anti-rotation pin and the stationary ring effectively restricts the stationary ring from rotating synchronously with the rotating ring, ensuring that the stationary ring always remains fixed. If the stationary ring rotates with the rotating ring, the sealing surface will change from relative sliding to synchronous rotation, resulting in loss of sealing function and potentially causing frictional wear between the stationary ring and the sealing gland. The anti-rotation pin's stopping action avoids these problems, ensuring that the rotating ring and stationary ring of the sealing pair are always in a normal sealing state of relative sliding, maintaining stable sealing performance, and preventing seal failure caused by the rotation of the stationary ring.

[0015] Specifically, the sealing cover is also provided with 6 adjusting screws, and the clamping disc A is pre-set with several detection screw holes; the vertical accuracy between the back of the sealing cover and the pump shaft is measured by the detection screw holes, and the installation position of the sealing cover is adjusted by adjusting the adjusting screws to realize the correction and adjustment of the device.

[0016] By adopting the above technical solution, the preset detection screw hole of the clamping disc A provides a convenient detection benchmark for measuring the vertical accuracy between the back of the sealing gland and the pump shaft. It can quickly determine whether there is any misalignment during installation and avoid problems such as misalignment of the sealing surface and local wear caused by insufficient installation accuracy. Six adjusting screws allow for precise fine-tuning of the sealing gland's installation position. By correcting the misalignment, the sealing gland is ensured to remain perpendicular to the pump shaft, thereby guaranteeing the parallelism and alignment of the sealing surfaces of the rotating and stationary rings. This reduces uneven wear of the sealing pairs caused by assembly deviations, improves the overall assembly accuracy and operational stability of the device, and lowers the risk of malfunctions caused by installation problems.

[0017] Specifically, the bushing is also provided with an internal hexagonal tapered set screw, the end of which abuts against the rotating ring and is used to assist in positioning the axial position of the rotating ring; the clamping disc B is connected to the positioning plate by a screw, and the positioning plate is clamped in the preset groove of the bushing to limit the radial displacement of the clamping mechanism.

[0018] By adopting the above technical solution, the contact design between the internal hexagonal cone end set screw and the rotating ring armor can assist in positioning the axial position of the rotating ring armor, avoid the rotating ring armor from axial movement due to factors such as vibration and fluid impact during operation, ensure the contact stability between the rotating ring armor and the stationary ring sealing surface, and prevent changes in the sealing gap due to axial displacement. The clamping disc B is connected to the positioning plate by screw one, and the positioning plate is clamped in the preset groove of the bushing. This structure can effectively limit the radial displacement of the clamping mechanism, prevent the clamping mechanism from radially shifting due to centrifugal force generated by the high-speed rotation of the pump shaft, ensure the stability of the clamping mechanism's fastening effect on the bushing and the pump shaft, prevent the bushing and the shaft from sliding relative to each other, and ensure the reliability of power transmission and the overall positional stability of the sealing components.

[0019] Specifically, a gap is provided between the bushing and the rotating ring A, through which water from the pump can enter the area around the rotating ring A, rotating ring B, and the two stationary rings; combined with the cooling effect of the closed labyrinth cooling mechanism, the water temperature in this area is maintained at around 50°C to achieve lubrication of the sealing friction end face.

[0020] By adopting the above technical solution, self-lubrication of the sealing friction end face is achieved, reducing wear: the gap between the bushing and the rotating ring armor provides a channel for water from inside the pump to enter the sealing pair area, and the water can form a water film on the sealing friction end faces of the rotating ring and the stationary ring; combined with the closed labyrinth cooling mechanism, the water temperature in this area is controlled at around 50℃, a suitable temperature for the stable existence of the water film, which can effectively reduce dry friction on the sealing surface and lower the wear rate. At the same time, the water film can also assist in heat dissipation, further protect the sealing surface, extend the service life of the sealing pair, and improve the economy and reliability of the device operation, which is especially suitable for sealing scenarios of pump equipment using water as the medium.

[0021] The beneficial effects of this invention are as follows: the distance between the two stationary sealing rings remains constant, and the thrust on the end face of the sealing friction ring remains constant; unaffected by pump shaft movement, the front rotating and stationary sealing rings do not require sealing, thus preventing liquid flow impact and fluctuations, ensuring the safe and stable operation of the sealing rings, and guaranteeing that the mechanical seal maintains satisfactory performance and ideal service life during deep peak-shaving operation of the unit. The near-closed environment formed by the heat exchange jacket, sealing gland, and front rotating and stationary rings effectively prevents the impact of fluid oscillations and fluctuations within the pump on the operation of the rear main sealing ring, maintaining stable operation. This further reduces or eliminates the negative impacts of peak-shaving operations. Attached Figure Description

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0023] Figure 1This is a schematic diagram of the main structure of the mechanical seal device for resisting shaft movement, anti-interference, and self-regulating temperature according to this utility model. Figure 2 This is a schematic diagram of the screw and exhaust valve structure of this utility model; Figure 3 This is a three-dimensional schematic diagram of the heat exchange inner sleeve of this utility model; In the diagram: 1. Heat exchanger inner sleeve; 2. Hexagonal cone-shaped set screw; 3. Rotating ring A; 4. Sealing gland; 5. Spring; 6. Bushing; 7. Elastic washer; 8. Hexagonal nut; 9. Bolt; 10. Clamping disc A; 11. Clamping ring; 12. Clamping disc B; 13. Screw 1; 14. Positioning plate; 15. Friction pad hexagonal head bolt; 16. O-ring 1; 17. O-ring 2; 18. O-ring 3; 19. O-ring 4; 20. O-ring 5; 21. O-ring 6; 22. Rotating ring B; 23. Push ring; 24. Spring seat; 25. Transmission key; 26. Standard transmission pin A; 27. Stationary ring; 28. Screw 2; 29. ​​Exhaust valve. Detailed Implementation

[0024] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0025] To save manpower and improve efficiency, as one embodiment of this utility model, such as Figure 1 , Figure 2 , Figure 3As shown in Figure 1, the mechanical seal device of this utility model, which is resistant to shaft movement, interference, and self-regulating temperature, includes a heat exchange inner sleeve 1, a shaft sleeve 6, a rotating ring A 3, a rotating ring B 22, two stationary rings 27, a sealing gland 4, a spring 5, a spring seat 24, a push ring 23, a transmission key 25, a standard transmission pin A 26, a clamping mechanism, and an O-ring assembly. The clamping mechanism consists of a clamping disc A 10, a clamping ring 11, and a clamping disc B 12. The O-ring assembly includes O-ring one 16, O-ring two 17, O-ring three 18, O-ring four 19, O-ring five 20, and O-ring six 21. The device as a whole has a double-end-face balanced structure, and all sealing components are wrapped by the heat exchange inner sleeve 1 and the sealing gland. Inside the protective and heat-insulating shell composed of the pressure cap 4; the rotating ring A 3 and rotating ring B 22 respectively form a dynamic and static sealing pair by tightly contacting the end faces of the two stationary rings 27; the bushing 6 is fastened to the pump shaft by a clamping mechanism, and the bushing 6 is connected to the spring seat 24 by a transmission key 25. The spring seat 24 is connected to the push ring 23 by a standard transmission pin A 26. The push ring 23 is provided with an R-shaped protrusion, and the R-shaped protrusion cooperates with the rotating ring A 3 and rotating ring B 22 to achieve drive; the spring 5 is set between the spring seat 24 and the push ring 23; the sealing pressure cap 4 is provided with an exhaust valve 29, and the sealing pressure cap 4 is connected to the pump cover by a bolt assembly composed of an elastic washer 7, a hexagonal nut 8, and a bolt 9.

[0026] During use, push the entire mechanical seal into the space formed by the sealing cavity and the pump shaft as shown in the diagram. Secure it to the predetermined position using the bolt assembly, elastic washer 7, hexagonal nut 8, and bolt 9. After confirming that the positioning plate 14 is normal (no deformation in the groove), tighten the clamping mechanism, locking disc A 10, clamping ring 11, and clamping disc B 12 to lock the sealing sleeve to the pump shaft. After installation, check the pump and motor for any abnormalities. Once the pump and motor are filled with water, fully vent the sealing cavity through the vent valve 29. Before operation, fully vent the sealing cavity through the cooling water inlet and outlet to ensure that the mechanical seal operates within a suitable temperature range (30~70℃).

[0027] The sealing gland is connected to the pump cover by a bolt assembly consisting of an elastic washer 7, a hexagonal nut 8, and a bolt 9. The elastic washer 7 can buffer the installation stress and prevent the sealing gland 4 from deforming due to excessive tightness during installation, thus ensuring the assembly accuracy of the sealing components. The exhaust valve can promptly discharge air from the sealing chamber, preventing air stagnation from causing dry friction on the sealing surface or forming air resistance that affects the sealing performance, thereby improving the stability of the device during startup and operation.

[0028] For example, such as Figure 1 and Figure 2As shown, the heat exchange inner sleeve 1 and the sealing cover 4 enclose a closed labyrinth cooling mechanism, which is attached to the outer periphery of the rotating ring A 3, the rotating ring B 22 and the two stationary rings 27; low-pressure demineralized water is introduced into the closed labyrinth cooling mechanism to form a circulating cooling channel, which is used to control the temperature in the sealed chamber at 30~70℃.

[0029] During use, the sealing gland 4 and the heat exchange inner sleeve 1 are integrated to form a closed labyrinth-type cooling mechanism, which then seals the outer circumference of the friction ring to achieve close-range circulating cooling of demineralized water. Water from the pump enters the area around the sealing ring through the gap between the bushing 6 and the rotating ring 3. Continuous cooling maintains the water temperature at a suitable level of approximately 50 degrees Celsius, ensuring good lubrication of the sealing friction end face.

[0030] For example, such as Figure 1 As shown, the spring seat 24 and the bushing 6 have a sliding fit structure. The spring seat 24 can move freely in both directions along the axial direction of the bushing 6 to keep the thrust of the spring 5 on the push ring 23 stable when the pump shaft moves.

[0031] In use, the bushing is fastened to the pump shaft by a wedge clamping mechanism, so that the bushing 4 and the shaft rotate synchronously. The sealing bushing 6 is driven by the key to the spring seat 24, and the spring seat 24 is driven by the push ring through the transmission pin 26. The push ring has an R-shaped protrusion to drive the rotating ring.

[0032] For example, such as Figure 1 As shown, an O-ring 19 is provided between the rotating ring 3 and the bushing 6 to form a sliding dynamic seal; an O-ring 16 is provided between the stationary ring 27 and the sealing gland 4 to form a static seal; an O-ring 21 is provided between the bushing 6 and the pump shaft; and an O-ring 18 is provided between the sealing gland 4 and the pump cover to prevent fluid leakage.

[0033] In use, the sealing rotating ring A3 and the sealing bushing 6 are sealed by O-ring 19 to achieve a sliding dynamic seal; the sealing stationary ring 27 and the sealing gland 4 are sealed by O-ring 16, with moderate sealing tightness and reliable performance; the sealing bushing 6 and the rotating shaft are tightly filled with O-ring 21 to prevent leakage; the sealing gland and the pump cover are tightly filled with O-ring 18 to prevent leakage.

[0034] For example, such as Figure 1 As shown, the sealing cap 4 is provided with an anti-rotation pin, which engages with the stationary ring 27 to restrict the stationary ring 27 from rotating synchronously with the rotating ring A 3 and the rotating ring B 22, thereby stopping the stationary ring 27.

[0035] During use, the rotating ring A3, rotating ring B22, and the two stationary rings 27 are in close contact with each other, and the friction between the end faces of the rotating and stationary rings prevents water leakage.

[0036] For example, such as Figure 1 As shown, the sealing cover 4 is also provided with 6 adjusting screws 28, and the clamping disc A 10 is provided with several detection screw holes. The vertical accuracy between the back of the sealing cover 4 and the pump shaft is measured by the detection screw holes, and the installation position of the sealing cover 4 is adjusted by adjusting the adjusting screws 28 to realize the correction and adjustment of the device.

[0037] When in use, the preset detection screw hole of the clamping disc A10 provides a convenient detection benchmark for measuring the perpendicularity accuracy between the back of the sealing cover 4 and the pump shaft. It can quickly determine whether there is any misalignment during installation and avoid problems such as misalignment of the sealing surface and local wear caused by insufficient installation accuracy. The six adjusting screws 28 can precisely fine-tune the installation position of the sealing gland 4. By correcting the deviation, the sealing gland 4 is ensured to remain perpendicular to the pump shaft, thereby ensuring the parallelism and alignment of the sealing surfaces of the rotating ring and stationary ring, reducing uneven wear of the sealing pair caused by assembly deviation, improving the overall assembly accuracy and operational stability of the device, and reducing the risk of failure caused by installation problems.

[0038] For example, such as Figure 1 As shown, the bushing 6 is also provided with an internal hexagonal cone-end set screw 2, the end of which abuts against the rotating ring 3 to assist in positioning the axial position of the rotating ring 3; the clamping disc 12 is connected to the positioning plate 14 by a screw 13, and the positioning plate 14 is clamped in the preset groove of the bushing 6 to limit the radial displacement of the clamping mechanism.

[0039] When in use, the contact design between the internal hexagonal cone end set screw 2 and the rotating ring 3 can assist in positioning the axial position of the rotating ring 3, preventing the rotating ring 3 from moving axially due to factors such as vibration and fluid impact during operation, ensuring the stability of the fit between the rotating ring and the stationary ring sealing surface, and preventing changes in the sealing gap due to axial displacement. The clamping disc 12 is connected to the positioning plate by screw 13, and the positioning plate is engaged in the preset groove of the bushing 6. This structure can effectively limit the radial displacement of the clamping mechanism, prevent the clamping mechanism from radially shifting due to centrifugal force generated by the high-speed rotation of the pump shaft, ensure the stability of the clamping mechanism's fastening effect on the bushing and the pump shaft, prevent the bushing 6 from sliding relative to the shaft, and ensure the reliability of power transmission and the overall positional stability of the sealing components.

[0040] For example, such as Figure 1 As shown, there is a gap between the bushing 6 and the rotating ring A 3, through which water from the pump can enter the area around the rotating ring A 3, rotating ring B 22 and the two stationary rings 27; combined with the cooling effect of the closed labyrinth cooling mechanism, the water temperature in this area is kept at about 50°C to achieve lubrication of the sealing friction end face.

[0041] During operation, the gap between the bushing 6 and the rotating ring 3 provides a channel for water to enter the sealing area. Water can form a film on the sealing friction surfaces of the rotating and stationary rings. Combined with a closed labyrinth cooling mechanism, the water temperature in this area is controlled at approximately 50°C, a suitable temperature for the stable existence of the water film. This effectively reduces dry friction on the sealing surfaces and lowers the wear rate. Water enters the area around the sealing rings through the gap between the bushing and the rotating ring. Continuous cooling maintains the water temperature at approximately 50°C, providing good lubrication to the sealing friction surfaces. The near-closed environment formed by the heat exchange jacket, sealing gland, and the front rotating and stationary rings effectively prevents fluid oscillations from impacting the operation of the rear main sealing ring, maintaining stable operation. This, in turn, reduces or eliminates the negative impacts of peak shaving by the unit.

[0042] It should be noted that this utility model is a mechanical seal device with anti-shaft movement, anti-interference, and self-regulating temperature. All components in this utility model are known to those skilled in the art, and their structure and principle can be learned by those skilled in the art through technical manuals or conventional experimental methods.

[0043] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The descriptions of the above embodiments and specifications are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of protection claimed by this utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A mechanical seal device resistant to shaft creep, interference and self-temperature adjustment, characterized by, The device includes a heat exchange inner sleeve (1), a bushing (6), a rotating ring A (3), a rotating ring B (22), two stationary rings (27), a sealing cover (4), a spring (5), a spring seat (24), a push ring (23), a transmission key (25), a standard transmission pin A (26), a clamping mechanism, and an O-ring assembly. The clamping mechanism consists of a clamping disc A (10), a clamping ring (11), and a clamping disc B (12). The O-ring assembly includes O-ring one (16), O-ring two (17), O-ring three (18), O-ring four (19), O-ring five (20), and O-ring six (21). The device as a whole has a double-end balanced structure, and all sealing components are wrapped in a protective and heat-insulating shell composed of the heat exchange inner sleeve (1) and the sealing cover (4). The rotating ring A (3) and rotating ring B (22) are in close contact with the end faces of the two stationary rings (27) to form a dynamic and static sealing pair; the bushing (6) is fastened to the pump shaft through a clamping mechanism, the bushing (6) is connected to the spring seat (24) through the transmission key (25), the spring seat (24) is connected to the push ring (23) through the standard transmission pin A (26), the push ring (23) is provided with an R-shaped protrusion, and the R-shaped protrusion cooperates with the rotating ring A (3) and rotating ring B (22) to achieve driving; the spring (5) is set between the spring seat (24) and the push ring (23); the sealing cover (4) is provided with an exhaust valve (29), and the sealing cover (4) is connected to the pump cover through a bolt assembly composed of an elastic washer (7), a hexagonal nut (8) and a bolt (9).

2. The mechanical seal device with anti-shaft movement, anti-interference, and self-regulating temperature control according to claim 1, characterized in that, The heat exchange inner sleeve (1) and the sealing cover (4) enclose a closed labyrinth cooling mechanism, which is attached to the outer periphery of the rotating ring A (3), the rotating ring B (22) and the two stationary rings (27); low-pressure demineralized water is introduced into the closed labyrinth cooling mechanism to form a circulating cooling channel, which is used to control the temperature in the sealed chamber at 30~70℃.

3. The mechanical seal device with anti-shaft movement, anti-interference, and self-regulating temperature control according to claim 1, characterized in that, The spring seat (24) and the bushing (6) are a sliding fit structure. The spring seat (24) can move freely in both directions along the axial direction of the bushing (6) to keep the thrust of the spring (5) on the push ring (23) stable when the pump shaft is axially displaced.

4. The mechanical seal device with anti-shaft movement, anti-interference, and self-regulating temperature control according to claim 1, characterized in that, O-ring four (19) is provided between the rotating ring (3) and the bushing (6) to form a sliding dynamic seal; O-ring one (16) is provided between the stationary ring (27) and the sealing gland (4) to form a static seal; O-ring six (21) is provided between the bushing (6) and the pump shaft, and O-ring three (18) is provided between the sealing gland (4) and the pump cover to prevent fluid leakage.

5. A mechanical seal device with anti-shaft movement, anti-interference, and self-regulating temperature control according to claim 1, characterized in that, The sealing cap (4) is provided with an anti-rotation pin, which engages with the stationary ring (27) to restrict the stationary ring (27) from rotating synchronously with the rotating ring A (3) and the rotating ring B (22), thereby stopping the stationary ring (27).

6. A mechanical seal device with anti-shaft movement, anti-interference, and self-regulating temperature control according to claim 1, characterized in that, The sealing cover (4) is also provided with 6 adjusting screws (28), and the clamping disc (10) is provided with several detection screw holes. The vertical accuracy between the back of the sealing cover (4) and the pump shaft is measured by the detection screw holes, and the installation position of the sealing cover (4) is adjusted by adjusting the adjusting screws (28) to realize the correction and adjustment of the device.

7. A mechanical seal device with anti-shaft movement, anti-interference, and self-regulating temperature control according to claim 1, characterized in that, The bushing (6) is also provided with an internal hexagonal cone end set screw (2), the end of which abuts against the rotating ring (3) to assist in positioning the axial position of the rotating ring (3); the clamping disc (12) is connected to the positioning plate (14) by screw (13), and the positioning plate (14) is clamped in the preset groove of the bushing (6) to limit the radial displacement of the clamping mechanism.

8. A mechanical seal device with anti-shaft movement, anti-interference, and self-regulating temperature control according to claim 1, characterized in that, A gap is provided between the bushing (6) and the rotating ring (3), through which water in the pump can enter the area around the rotating ring (3), the rotating ring (22) and the two stationary rings (27); combined with the cooling effect of the closed labyrinth cooling mechanism, the water temperature in this area is kept at about 50°C to achieve lubrication of the sealing friction end face.

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