Anti-adhesion mechanical seal assembly with grease added into M-shaped double-lip annular concave part

Abstract

The utility model relates to the technical field of mechanical sealing, and discloses an anti-adhesion mechanical sealing assembly with grease added into an M-shaped double-lip ring concave part, which comprises a double-ring sealing structure, a rubber corrugated pipe, a stainless steel straining ring and a stainless steel spring, and the double-ring sealing structure comprises a silicon carbide static ring and an M-shaped double-lip moving ring which are sleeved on a transmission shaft. The silicon carbide static ring is a pressureless sintering graphite silicon carbide ring, the M-shaped double-lip moving ring is a pressureless sintering graphite silicon carbide M-shaped ring, a groove is formed in the connecting face of the M-shaped double-lip moving ring and the silicon carbide static ring, and the section of the connecting face is in an M shape. According to the mechanical sealing assembly, the grease is added into the groove of the M-shaped double-lip ring so that bonding can be prevented, the service life of the product can be longer by reducing the friction coefficient, the abrasion resistance and the lubricity are better by using pressureless sintering silicon carbide and graphite as the movable ring and the static ring, and the mechanical sealing assembly with the grease added into the groove is simple in structure and has the bonding prevention function.

Description

Technical Field

[0001] This utility model relates to the field of mechanical seals, and in particular to a mechanical seal assembly with an M-shaped double-lip ring having grease added inside to prevent adhesion. Background Technology

[0002] A mechanical seal is a shaft sealing device for rotating machinery, such as centrifugal pumps, centrifuges, reactors, and compressors. Because the drive shaft runs through the inside and outside of the equipment, a circumferential gap exists between the shaft and the equipment. The medium inside the equipment leaks outward through this gap. If the pressure inside the equipment is lower than atmospheric pressure, air leaks into the equipment. Therefore, a shaft sealing device is necessary to prevent leakage. There are many types of shaft seals, but mechanical seals are the most common shaft sealing method for these types of equipment worldwide due to their advantages such as low leakage and long service life. Mechanical seals are also called end-face seals. According to relevant national standards, they are defined as: a device that prevents fluid leakage by maintaining contact and relative sliding between at least one pair of end faces perpendicular to the axis of rotation under the action of fluid pressure, the elastic force (or magnetic force) of the compensation mechanism, and the cooperation of auxiliary seals. Currently, mechanical seals are used to seal rotating machinery to prevent internal liquid leakage. However, traditional mechanical seals, due to rapid and high-temperature operation, may cause adhesion or leakage during use, leading to motor burnout and unnecessary losses.

[0003] Patent application CN106678073A discloses a bushing-less, bearing-less, double-end-face cartridge mechanical seal. A front stationary ring, a front pressure cover, and a rear pressure cover, located on the outside of the pump body, are connected in sequence and close with the pump shaft to form a chamber. The pump shaft is connected to a PTFE bellows in the chamber. The front stationary ring and the front moving ring, which is formed by silicon carbide embedded in the PTFE bellows, fit together to form the first grinding surface. A half-ring is clamped at the rear end of the PTFE bellows. A limiting wear-resistant plate is provided at the rear end of the half-ring. A cylindrical pin is also provided between the limiting wear-resistant plate and the half-ring to drive the rear cold moving ring. A cold moving ring, a cooling ring, a push ring, and a second elastic compensation element are connected in sequence at the rear end of the limiting wear-resistant plate. The surfaces of the cold moving ring and the cooling ring fit together to form the second grinding surface.

[0004] The existing sealing structure may cause adhesion or leakage during use due to rapid high-temperature operation, which could burn out the motor and cause unnecessary losses.

[0005] Therefore, a new technical solution is needed to solve the above-mentioned technical problems. Utility Model Content

[0006] The purpose of this invention is to provide a mechanical seal assembly with an M-type double-lip ring groove filled with grease to prevent adhesion. The grease filling in the groove of the moving ring prevents adhesion and reduces the coefficient of friction, thus extending the service life of the product. Using pressureless sintered silicon carbide and graphite for the moving and stationary rings provides better wear resistance and lubrication. This mechanical seal assembly with grease filling in the groove has a simple structure and has an anti-adhesion function.

[0007] The technical solution adopted in this utility model is:

[0008] A mechanical seal assembly with an M-shaped double-lip ring and grease filling in the recess to prevent adhesion includes a double-ring sealing structure, a rubber bellows, a stainless steel retaining ring, and a stainless steel spring. The double-ring sealing structure includes a silicon carbide stationary ring and an M-shaped double-lip moving ring sleeved on the drive shaft. The silicon carbide stationary ring is a pressureless sintered silicon carbide ring with graphite, and the M-shaped double-lip moving ring is a pressureless sintered silicon carbide M-shaped ring with graphite. The contact surface between the M-shaped double-lip moving ring and the silicon carbide stationary ring has a groove, and the cross-section of the contact surface is M-shaped.

[0009] By adopting the above structure, the groove of the M-type double lip ring of the device is filled with grease to prevent sticking. By reducing the coefficient of friction, the product can be used for a longer time. The use of pressureless sintered silicon carbide and graphite for the dynamic and static rings provides better wear resistance and lubrication. This mechanical seal assembly with grease in the groove has a simple structure and has an anti-sticking function.

[0010] Preferably, a rubber stationary ring sleeve is fitted onto the silicon carbide stationary ring.

[0011] The above structure is used to fix the position of the silicon carbide stationary ring.

[0012] Preferably, a stainless steel transmission sleeve is fitted onto the M-type double-lip moving ring, and a rubber bellows is provided between the stainless steel transmission sleeve and the M-type double-lip moving ring to fix the M-type double-lip moving ring inside the stainless steel transmission sleeve.

[0013] Preferably, the front end of the rubber bellows is pressed into the front end of the stainless steel transmission sleeve by an M-shaped double-lip moving ring.

[0014] Preferably, a stainless steel retaining ring is provided inside the rear end of the stainless steel transmission sleeve. The stainless steel retaining ring is fitted onto the outer peripheral wall of the rear end of the rubber bellows and is secured between the rear end of the rubber bellows and the rear end of the stainless steel transmission sleeve.

[0015] Preferably, the rear end of the rubber corrugated pipe is provided with a groove, and a stainless steel retaining ring is provided in the groove.

[0016] By adopting the above structure, the M-type double-lip moving ring is fixed in position by the stainless steel transmission sleeve and the rubber bellows, ensuring the sealing effect. Furthermore, the pressure of the stainless steel tightening ring on the rubber bellows ensures that the M-type double-lip moving ring and the rubber bellows operate synchronously with the transmission shaft during use, which can prevent the rubber bellows from being twisted off and also ensure the sealing effect of the device.

[0017] Preferably, a stainless steel spring is connected to the rear end of the stainless steel transmission sleeve, and the stainless steel spring is located on a stainless steel spring seat between the stainless steel transmission sleeve and the stainless steel spring seat.

[0018] By adopting the above structure, the stainless steel spring is sleeved on the outer rear end of the stainless steel transmission sleeve to prevent the stainless steel spring from rubbing against the rubber bellows. The stainless steel spring applies an elastic force to the stainless steel transmission sleeve, so that the silicon carbide stationary ring and the M-type double-lip moving ring are in close contact, which plays an automatic compensation role for the sealing wear of the moving and stationary rings and ensures the sealing performance.

[0019] Compared with the prior art, this utility model has the following advantages:

[0020] 1. The groove of the M-type double lip ring of this utility model device is filled with grease to prevent sticking. By reducing the coefficient of friction, the product can be used for a longer time. The use of pressureless sintered silicon carbide and graphite for the dynamic and static rings provides better wear resistance and lubrication. This mechanical seal component with grease in the groove has a simple structure and has an anti-sticking function.

[0021] 2. The device of this utility model fixes the M-type double-lip moving ring in position by setting a stainless steel transmission sleeve and a rubber bellows, ensuring the sealing effect. Furthermore, the pressure of the stainless steel tightening ring on the rubber bellows ensures that the M-type double-lip moving ring and the rubber bellows operate synchronously with the transmission shaft during use, which can prevent the rubber bellows from being twisted off and also ensure the sealing effect of the device.

[0022] 3. The device of this utility model is equipped with a stainless steel spring sleeved on the outer rear end of the stainless steel transmission sleeve to prevent the stainless steel spring from scratching the rubber bellows. The stainless steel spring applies an elastic force to the stainless steel transmission sleeve, so that the silicon carbide stationary ring and the M-type double-lip moving ring are in close contact, which plays an automatic compensation role for the sealing wear of the moving and stationary rings and ensures the sealing performance. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of this utility model;

[0024] Figure 2 This is a schematic diagram of the structure of the M-type double-lip moving ring of this utility model;

[0025] Figure 3 This is a schematic diagram of the structure of the rubber corrugated pipe of this utility model;

[0026] Figure 4 This is a schematic diagram of the stainless steel transmission sleeve of this utility model.

[0027] Among them: 1. Rubber stationary ring sleeve; 2. Silicon carbide stationary ring; 3. M-type double-lip moving ring; 4. Stainless steel transmission sleeve; 5. Rubber bellows; 6. Stainless steel tightening ring; 7. Stainless steel spring; 8. Stainless steel spring seat; 9. Groove; 10. Contact surface; 11. Groove. Detailed Implementation

[0028] like Figure 1-4 As shown, a mechanical seal assembly with an M-shaped double-lip ring and grease filling the recess to prevent adhesion includes a double-ring sealing structure, a rubber bellows 5, a stainless steel retaining ring 6, and a stainless steel spring 7. The double-ring sealing structure includes a silicon carbide stationary ring 2 and an M-shaped double-lip moving ring 3 fitted onto the drive shaft. The silicon carbide stationary ring 2 is a pressureless sintered silicon carbide ring with graphite, and a rubber stationary ring sleeve 1 is fitted onto it. The M-shaped double-lip moving ring 3 is a pressureless sintered silicon carbide M-shaped ring with graphite. The contact surface 10 between the M-shaped double-lip moving ring 3 and the silicon carbide stationary ring 2 has a groove 9, and the contact surface 10 has an M-shaped cross-section. The grease filling in the groove 9 of the M-shaped double-lip ring 3 prevents adhesion, thereby reducing the coefficient of friction and extending the product's service life. Using pressureless sintered silicon carbide with graphite for both the moving and stationary rings provides better wear resistance and lubrication. This mechanical seal assembly with grease filling in the recess has a simple structure and provides anti-adhesion functionality.

[0029] A stainless steel transmission sleeve 4 is fitted onto the M-type double-lip moving ring 3. A rubber bellows 5 is positioned between the stainless steel transmission sleeve 4 and the M-type double-lip moving ring 3, fixing the M-type double-lip moving ring 3 within the stainless steel transmission sleeve 4. The front end of the rubber bellows 5 is pressed tightly within the front end of the stainless steel transmission sleeve 4 by the M-type double-lip moving ring 3. A stainless steel retaining ring 6 is located within the rear end of the stainless steel transmission sleeve 4, fitting onto the outer peripheral wall of the rear end of the rubber bellows 5 and securing it between the rear end of the rubber bellows 5 and the rear end of the stainless steel transmission sleeve 4. A groove 11 is provided at the rear end of the rubber bellows 5, and the stainless steel retaining ring 6 is arranged within the groove 11. The stainless steel transmission sleeve 4 and the rubber bellows 5 fix the M-type double-lip moving ring 3 in position, ensuring a sealing effect. Furthermore, the pressure exerted by the stainless steel retaining ring 6 on the rubber bellows 5 ensures that the M-type double-lip moving ring 3 and the rubber bellows 4 operate synchronously with the drive shaft during use, preventing the rubber bellows 4 from being twisted off and guaranteeing the sealing effect of the device.

[0030] A stainless steel spring 7 is connected to the outer rear end of the stainless steel transmission sleeve 4. The stainless steel spring 7 is located on the stainless steel spring seat 8, between the stainless steel transmission sleeve 4 and the stainless steel spring seat 8. The stainless steel spring 7 is fitted onto the outer rear end of the stainless steel transmission sleeve 4 to prevent the stainless steel spring 7 from scratching the rubber bellows 5. The stainless steel spring 7 applies an elastic force to the stainless steel transmission sleeve 4, ensuring tight contact between the silicon carbide stationary ring 2 and the M-type double-lip moving ring 3, thereby automatically compensating for wear on the moving and stationary rings and ensuring sealing performance.

[0031] Before starting the drive shaft, this device is used to check the accuracy of the contact position between the silicon carbide stationary ring 2 and the M-type double-lip moving ring 3, whether grease has been added to the groove 9 of the M-type double-lip ring 3, and whether the rubber bellows 5 is securely fastened. Once these checks are passed, the device can be put into use. Adding grease to the groove of the moving ring prevents adhesion and reduces the coefficient of friction, thus extending the product's service life. Using pressureless sintered silicon carbide with graphite for both the moving and stationary rings provides better wear resistance and lubrication. This type of mechanical seal assembly with grease in the groove has a simple structure and anti-adhesion function.

[0032] The embodiments described above are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Any modifications and improvements made by those skilled in the art to the technical solutions of the present utility model without departing from the spirit of the present utility model should be included within the scope of protection defined by the claims of the present utility model.

Claims

1. A mechanical seal assembly of M type double-lip ring recessed grease can prevent adhesion, comprising double-ring seal structure and rubber corrugated pipe, stainless steel tight ring, stainless steel spring, characterized in that: The double-ring sealing structure comprises a silicon carbide static ring sleeved on the transmission shaft, and an M-shaped double-lip dynamic ring. ​ 2. A mechanical seal assembly of M-type double-lip ring recessed grease feeding capable of preventing adhesion according to claim 1, characterized in that: The silicon carbide static ring is a pressureless sintering graphite silicon carbide ring.

3. A mechanical seal assembly of M-type double-lip ring recessed grease feeding capable of preventing adhesion according to claim 1, characterized in that: The M-shaped double-lip dynamic ring is sleeved with a stainless steel transmission sleeve.

4. A mechanical seal assembly of M-type double-lip ring recessed grease feeding capable of preventing adhesion according to claim 3, characterized in that: The M-shaped double-lip dynamic ring is fixed in the stainless steel transmission sleeve through the rubber bellow.

5. A mechanical seal assembly of the type described in claim 4 wherein: The front end of the rubber bellow is pressed in the front end of the stainless steel transmission sleeve through the M-shaped double-lip dynamic ring.

6. A mechanical seal assembly of the type described in claim 5 wherein: The rear end of the stainless steel transmission sleeve is provided with a stainless steel tight ring.

7. A mechanical seal assembly of claim 5, wherein: The rear end of the rubber bellow is provided with a groove, and the stainless steel tight ring is arranged in the groove. The rear end of the stainless steel transmission sleeve is provided with a stainless steel spring. The stainless steel spring is arranged in a stainless steel spring seat. The stainless steel spring is located between the stainless steel transmission sleeve and the stainless steel spring seat.

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