A double mechanical seal with multiple seals

Abstract

A double-end mechanical seal with multiple seals includes a cover, a first sealing assembly, a second sealing assembly, and a spring assembly disposed between the first and second sealing assemblies. A concave cavity is formed on the inner wall of the cover, and a cooling groove exists between the first and second sealing assemblies, the spring assembly, and the inner wall of the cover. The first sealing assembly includes a first stationary ring and a first rotating ring disposed on one side of the first stationary ring. The second sealing assembly is disposed within the cavity and near the outside of the cover, and includes a second stationary ring and a second rotating ring disposed on one side of the second stationary ring. The double-end mechanical seal with multiple seals achieves double isolation between the rotating and stationary rings through the first and second sealing assemblies, thus preventing leakage of chemical liquids.

Description

Technical Field

[0001] This utility model relates to the field of mechanical seal technology, and in particular to a double-end mechanical seal with multiple seals. Background Technology

[0002] Mechanical seals, as critical sealing components in industrial equipment, are widely used in pumps, mixing tanks, compressors, and other devices. Their primary function is to prevent media leakage between rotating shafts and stationary components. In the industrial sector, especially under complex conditions involving high-temperature, high-pressure, and corrosive media, the performance of mechanical seals directly affects the operational stability of equipment and significantly impacts the safety, efficiency, and economic benefits of industrial production. For example, Chinese patent CN202421873763.2 discloses a double-end mechanical seal, which includes a left stationary support, a left stationary ring, a left movable support, a left movable ring, a right stationary support, a right stationary ring, a right movable support, and a right movable ring. The left stationary ring is fixed to the left stationary support, the right stationary ring is fixed to the right stationary support, the left movable ring is fixed to the left movable support, and the right movable ring is fixed to the right movable support. The left stationary ring and the left movable ring abut against each other, and the right stationary ring and the right movable ring abut against each other. A left fixed bracket is connected to the outer wall of the left movable support, and a right fixed bracket is connected to the outer wall of the right movable support. The left fixed bracket is provided with a left L-shaped section, and the right fixed bracket is provided with a right L-shaped section. An elastic element is provided between the left L-shaped section and the right L-shaped section. This mechanical seal only requires one elastic element to achieve contact between the left movable ring and the left stationary ring, and between the right movable ring and the right stationary ring, making installation convenient. However, there is no sealing element between the left static support and the mixing vessel in this mechanical seal, which can easily cause leakage of chemical liquid media, and the corrosiveness of the chemical liquid media will greatly reduce the service life of the mechanical seal. Summary of the Invention

[0003] In view of this, the present invention provides a double-end mechanical seal with multiple seals to solve the above problems.

[0004] A double-end mechanical seal with multiple seals includes a cover, a first sealing assembly disposed inside the cover, a second sealing assembly disposed on one side of the first sealing assembly, and a spring assembly disposed between the first and second sealing assemblies. A concave cavity is formed on the inner wall of the cover, and a cooling groove exists between the first and second sealing assemblies, the spring assembly, and the inner wall of the cover. The first sealing assembly includes a first stationary ring and a first rotating ring disposed on one side of the first stationary ring. The second sealing assembly is disposed within the cavity and near the outside of the cover, and includes a second stationary ring and a second rotating ring disposed on one side of the second stationary ring. The spring assembly includes a sleeve, a plurality of springs spaced apart inside the sleeve, a first push ring disposed at one end of the springs, and a second push ring disposed on the side of the springs away from the first push ring. The first stationary ring is embedded in a stationary ring seat. The first stationary ring and the first moving ring rotate relative to each other, and the second stationary ring and the second moving ring rotate relative to each other. The first stationary ring has a circular groove on its outer circumferential wall facing the stirring vessel. There is an annular cavity between the side of the first stationary ring with the circular groove and the stationary ring seat. A sealing ring is provided in the cavity. The sealing ring is larger than the thickness of the cavity. The sealing ring is made of fluororubber.

[0005] Furthermore, an inlet and an outlet are respectively provided at two opposite positions on the inner sidewall of the cover. The inlet and outlet connect the cooling tank to the outer side of the cover, and the inlet is located below the outlet.

[0006] Furthermore, an internal spline is provided on the inner wall of the sleeve, and an external spline is provided on the outer walls of the first and second rotating rings.

[0007] Furthermore, the length direction of the spring is parallel to the arrangement direction of the first and second push rings.

[0008] Furthermore, one side of the first push ring is fixedly disposed on the first moving ring, and one side of the second push ring is fixedly disposed on the second moving ring.

[0009] Furthermore, one end of the spring is fixedly abutted against the surface of the first push ring, and the other end is fixedly abutted against the surface of the second push ring, and the spring is always in a compressed state.

[0010] Furthermore, the first and second stationary rings, as well as the first and second moving rings, are all made of silicon dioxide.

[0011] Furthermore, the double-end mechanical seal with multiple seals also includes a retaining ring that is engaged with the cover body, the outer side wall of which is engaged with the cover body.

[0012] Compared with existing technologies, the double-end mechanical seal with multiple seals provided by this utility model achieves a double isolation between the dynamic and stationary rings through the first and second sealing components, thus preventing the leakage of chemical liquids. The sealing ring and multiple rubber rings form multiple sealing barriers, further preventing the leakage of chemical liquids. Furthermore, the sealing ring and multiple rubber rings, made of fluororubber, possess excellent heat resistance, oxidation resistance, oil resistance, corrosion resistance, and atmospheric aging resistance, thereby ensuring good sealing performance while extending the service life of the mechanical seal. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of the double-end mechanical seal with multiple seals provided by this utility model.

[0014] Figure 2 for Figure 1 Enlarged diagram of point A in the middle. Detailed Implementation

[0015] The specific embodiments of this utility model are described in further detail below. It should be understood that the description of the embodiments of this utility model herein is not intended to limit the scope of protection of this utility model.

[0016] like Figure 1 The diagram shows a structural schematic of the double-end mechanical seal with multiple seals provided by this utility model. The double-end mechanical seal with multiple seals includes a cover 10, a first sealing component 20 disposed inside the cover 10, a second sealing component 30 disposed on one side of the first sealing component 20, and a spring component 40 disposed between the first sealing component 20 and the second sealing component 30. It is conceivable that the double-end mechanical seal with multiple seals also includes other functional modules, such as a stirring vessel, cooling water, etc., which are technologies known to those skilled in the art and will not be described in detail here.

[0017] It should be noted that the double-end mechanical seal with multiple seals is fitted onto a rotating shaft 50 and connected by a bushing 51. The rotating shaft 50 extends into the mixing vessel to stir the chemical liquid. The double-end mechanical seal with multiple seals is located at the mouth of the mixing vessel to seal it and prevent leakage of the internal chemical liquid. The rotating shaft 50 and the bushing 51 are tightly fitted together, so that the rotation of the rotating shaft 50 can drive the rotation of the bushing 51. A rubber ring exists between the rotating shaft 50 and the bushing 51 to seal any gaps between them.

[0018] The cover 10 is fixed to the stirring vessel with screws. A concave cavity 11 is formed on its inner wall, which accommodates the first and second sealing components 20 and 30, the spring assembly 40, etc. A cooling groove 12 exists between the first and second sealing components 20 and 30, the spring assembly 40, and the inner wall of the cover 10. An inlet 13 and an outlet 14 are respectively provided at two opposite positions on the inner wall of the cover 10, and the inlet and outlet 13 and outlet 14 connect the cooling groove 12 to the outer side of the cover 10. In practical applications, the inlet 13 is located below the outlet 14. The angle between the line connecting the inlet 13 and the axis of the rotating shaft 50 and the horizontal line is 15°, and the angle between the line connecting the outlet 14 and the axis of the rotating shaft 50 and the horizontal line is also 15°. This allows the cooling water entering from the lower inlet 13 to fill the gaps in the entire chamber 11 using its own gravity, preventing some areas from not being in contact with cooling water due to high-level water intake. It should be noted that the cooling water pressure needs to be higher than the pressure of the chemical liquid medium and the atmospheric pressure outside the cover 10. This pressure difference allows the cooling water to continuously and slightly permeate the chemical liquid medium and the outside of the cover 10, thereby preventing leakage of the chemical liquid and achieving double isolation.

[0019] The first sealing assembly 20 is disposed in the chamber 11 and near the side of the stirred vessel, and includes a first stationary ring 21 and a first moving ring 22 disposed on one side of the first stationary ring 21.

[0020] The first stationary ring 21 is embedded in a stationary ring seat 23, which is embedded in the cover 10 and sealed by a rubber ring. A gasket 24 is provided between the stationary ring seat 23 and the first stationary ring 21 to enhance the sealing between them.

[0021] The first stationary ring 21 has a circular groove on its outer circumferential wall facing the stirred tank. When the first stationary ring 21 is embedded in the stationary ring seat 23, there is an annular cavity between the side of the first stationary ring 21 with the circular groove and the stationary ring seat 23. A sealing ring 25 is provided in the cavity, and the sealing ring 25 is larger than the thickness of the cavity. Thus, when the double-end mechanical seal with multiple seals is installed on the stirred tank, the sealing ring 25 is flattened by the first stationary ring 21 and the shell of the stirred tank, thereby ensuring the sealing between the first stationary ring 21 and the stirred tank, forming the first sealing barrier.

[0022] The inner wall of the first rotating ring 22 abuts against the outer wall of the bushing 51, and the outer wall of the first rotating ring 22 is provided with an external spline and partially connected to the spring assembly 40. This part of the spring assembly 40 is fixedly disposed on the bushing 51, so that the first rotating ring 22 can rotate with the rotation of the bushing 51. The specific structure of the spring assembly 40 will be described below. A rubber ring is provided between the first rotating ring 22 and the rotating shaft 50 to ensure the sealing between the first rotating ring 22 and the rotating shaft 50, thereby forming a second sealing barrier.

[0023] When the first stationary ring 21 and the first moving ring 22 rotate relative to each other, the cooling water in the cooling tank 12 will enter the gap between the first stationary ring 21 and the first moving ring 22 to form a micron-level rigid water film, thereby ensuring the sealing between the first stationary ring 21 and the first moving ring 22, forming a third sealing barrier to prevent the chemical liquid in the stirring vessel from leaking out.

[0024] The second sealing assembly 30 is disposed in the chamber 11 and on one side near the outside of the cover 11, and includes a second stationary ring 31 and a second moving ring 32 disposed on one side of the second stationary ring 31.

[0025] The second stationary ring 31 is sealed to the cover 10. The inner wall of the second moving ring 32 abuts against the outer wall of the bushing 51, and the outer wall of the second moving ring 32 is provided with an external spline and is partially connected to the spring assembly 40. This part of the spring assembly 40 is fixedly disposed on the bushing 51, so that the second moving ring 32 can rotate with the rotation of the bushing 51. The specific structure of the spring assembly 40 will be described below. A rubber ring is provided between the second moving ring 32 and the bushing 51 to ensure the sealing between the second moving ring 32 and the bushing 51, thereby forming a fourth sealing barrier.

[0026] When the second stationary ring 31 and the second moving ring 32 rotate relative to each other, the cooling water in the cooling tank 12 will enter the gap between the second stationary ring 31 and the second moving ring 32 to form a micron-level rigid water film, thereby ensuring the sealing between the second stationary ring 31 and the second moving ring 32, forming a fifth sealing barrier to prevent the chemical liquid in the stirring tank from leaking out.

[0027] The spring assembly 40 includes a sleeve 41, a plurality of springs 42 spaced apart inside the sleeve 41, a first push ring 43 disposed at one end of the spring 42, and a second push ring 44 disposed on the side of the spring 42 away from the first push ring 43.

[0028] The sleeve 41 is fixed to the bushing 51 by a number of screws, so that the sleeve 41 can rotate with the bushing 51. The inner sidewall of the sleeve 41 is provided with an internal spline, which cooperates with the external splines on the outer sidewalls of the first and second moving rings 22 and 32 to complete the radial torque transmission, so that the first and second moving rings 22 and 32 can rotate with the sleeve 41.

[0029] The length direction of the spring 42 is parallel to the arrangement direction of the first and second push rings 43 and 44. One side of the first push ring 43 is fixedly mounted on the first moving ring 22, and one side of the second push ring 44 is fixedly mounted on the second moving ring 32. One end of the spring 42 is fixedly abutted against the surface of the first push ring 43, and the other end is fixedly abutted against the surface of the second push ring 44. The spring 42 is always in a compressed state. Thus, under the axial preload of the spring 42, the first and second push rings 43 and 44 drive the first and second moving rings 22 and 32 to always remain in a state of mutual distance, compensating for the wear gap caused by relative rotational wear, thereby ensuring that the first and second moving rings 22 and 32 can always be tightly fitted with the first and second stationary rings 21 and 31 respectively, maintaining their sealing interface.

[0030] Both the dynamic and stationary rings used above are made of silica. Silica has excellent wear resistance, high temperature resistance, and strong corrosion resistance, which can greatly increase the service life of the mechanical seal. The rubber rings and the sealing ring 25 used above are both made of fluororubber. Fluororubber has excellent heat resistance, oxidation resistance, oil resistance, corrosion resistance, and atmospheric aging resistance, thus ensuring good sealing performance of the mechanical seal while extending its service life.

[0031] The double-end mechanical seal with multiple seals also includes a retaining ring 60 that is engaged with the cover 10. The outer side wall of the retaining ring 60 is engaged with the cover 10, and its inner side wall is engaged with the bushing 51, thereby limiting the rotation of the bushing 51 and the rotating shaft 50, completing axial fixation, and ensuring the stable operation of the sealing assembly.

[0032] Compared with existing technologies, the double-end mechanical seal with multiple seals provided by this utility model achieves a double isolation between the dynamic and stationary rings through the first sealing component 20 and the second sealing component 30, thus preventing the leakage of chemical liquids. The sealing ring 25 and multiple rubber rings form multiple sealing barriers, further preventing the leakage of chemical liquids. Moreover, the sealing ring 25 and multiple rubber rings, made of fluororubber, have excellent heat resistance, oxidation resistance, oil resistance, corrosion resistance, and atmospheric aging resistance, thereby ensuring good sealing performance of the mechanical seal while extending its service life.

[0033] The above are merely preferred embodiments of the present utility model and are not intended to limit the scope of protection of the present utility model. Any modifications, equivalent substitutions or improvements within the spirit of the present utility model are covered within the scope of the claims of the present utility model.

Claims

1. A double-end mechanical seal with multiple sealing features, characterized in that: The double-end mechanical seal with multiple seals includes a cover, a first sealing assembly disposed inside the cover, a second sealing assembly disposed on one side of the first sealing assembly, and a spring assembly disposed between the first and second sealing assemblies. A recessed cavity is formed on the inner wall of the cover. A cooling groove exists between the first and second sealing assemblies, the spring assembly, and the inner wall of the cover. The first sealing assembly includes a first stationary ring and a first rotating ring disposed on one side of the first stationary ring. The second sealing assembly is disposed within the cavity and near the outside of the cover, and includes a second stationary ring and a first rotating ring disposed on one side of the second sealing assemblies. The second moving ring on one side of the stationary ring, the spring assembly includes a sleeve, a plurality of springs spaced apart inside the sleeve, a first push ring disposed at one end of the spring, and a second push ring disposed on the side of the spring away from the first push ring. The first stationary ring is embedded in a stationary ring seat. The first stationary ring and the first moving ring rotate relative to each other, and the second stationary ring and the second moving ring rotate relative to each other. The outer circumferential wall of the first stationary ring has a circular groove at the end facing the stirring vessel. The side of the first stationary ring with the circular groove has an annular cavity between itself and the stationary ring seat. A sealing ring is disposed in the cavity. The sealing ring is larger than the thickness of the cavity. The sealing ring is made of fluororubber.

2. The double-end mechanical seal with multiple seals according to claim 1, characterized in that: An inlet and an outlet are respectively provided at two opposite positions on the inner side wall of the cover. The inlet and outlet connect the cooling tank to the outer side of the cover. The inlet is located below the outlet.

3. The double-end mechanical seal with multiple seals according to claim 1, characterized in that: The inner wall of the sleeve is provided with an internal spline, and the outer walls of the first and second rotating rings are provided with external splines.

4. The double-end mechanical seal with multiple seals according to claim 1, characterized in that: The length direction of the spring is parallel to the arrangement direction of the first and second push rings.

5. The double-end mechanical seal with multiple seals according to claim 1, characterized in that: One side of the first push ring is fixedly disposed on the first moving ring, and one side of the second push ring is fixedly disposed on the second moving ring.

6. The double-end mechanical seal with multiple seals according to claim 1, characterized in that: One end of the spring is fixedly abutted against the surface of the first push ring, and the other end is fixedly abutted against the surface of the second push ring. The spring is always in a compressed state.

7. The double-end mechanical seal with multiple seals according to claim 1, characterized in that: The first and second stationary rings, as well as the first and second moving rings, are all made of silicon dioxide.

8. The double-end mechanical seal with multiple seals according to claim 1, characterized in that: The double-end mechanical seal with multiple seals also includes a retaining ring that is engaged with the cover, the outer side of which is engaged with the cover.

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