WO2018059249A1

WO2018059249A1 - Axial lip sealing device for rotating shaft

Info

Publication number: WO2018059249A1
Application number: PCT/CN2017/101879
Authority: WO
Inventors: 李雄; 李秀华; 李上平; 丁文静
Original assignee: 桂林端面油封科技有限公司; 李雄
Priority date: 2016-09-30
Filing date: 2017-09-15
Publication date: 2018-04-05
Also published as: CN106286840A; CN106286840B

Abstract

Disclosed is an axial lip sealing device for a rotating shaft, comprising a non-compensation ring (1), a compensation ring (2), a compensation ring seat (3) and a compression spring (4) sequentially connected, wherein an upper end face of the compensation ring (2) is attached with an end face of the non-compensation ring (1), a lower end face is fixed by the compensation ring seat (3), a lower end face of the compensation ring seat (3) is attached to the compression spring (4), the compensation ring (2) is an axial lip sealing ring, an upper end face thereof is a funnel-shaped sealing end face (5) with a low inner ring and a high outer ring, the back face of the funnel-shaped sealing end face (5) is provided with a horizontal V-shaped spring slot (6) large outside and small inside, a garter spring (7) is mounted in the horizontal V-shaped spring slot (6), and the compression spring (4) is a combined compression spring, comprising an annular ring (8), and an upper boss (9) and a lower boss (10) spaced apart from one another on upper and lower end faces of the annular ring (8). The phenomena of expansion and hardening will not easily occur in this device, and the device can adapt to changes in the roughness and eccentricity of the shaft, has a good eccentric follower capability, and can bear high pressure, has a good sealing performance in a high speed, high temperature, high dust and corrosive sealing medium environment, has high reliability, long service life and a simple structure, and can be installed easily.

Description

Axial lip seal device for rotating shaft

Technical field

The present invention relates to a seal for a rotating shaft in mechanical manufacturing, and more particularly to an axial lip seal for a rotating shaft.

Background technique

In the existing rotary shaft seal contact seals, there are generally two types. One type of radial seal is to seal the surface of the rotating shaft with the lip of elastic rubber and polytetrafluoroethylene, which is simply referred to as oil seal, and the other is The axial seal is a sealing mechanism that uses two hard silicon carbide, graphite, ceramic, alloy, steel, bronze, cast iron materials to make two polished sealing end faces that slide under axial spring pressure, which is referred to as mechanical seal. . Although the sealing purpose is achieved in different ways, there are also some disadvantages in different degrees, such as the phenomenon that the sealing lip of the elastic rubber is prone to expansion and hardening in the lubricating medium. The PTFE plastic sealing lip has no compression elasticity, can not adapt to the change of shaft roughness and eccentricity, has poor dynamic eccentric followability, is easy to hurt the shaft, and is not resistant to pressure. The mechanically sealed silicon carbide and ceramic sealing ring are easy. Broken, anti-heavy load is not very good. The sealing end face of the graphite sealing ring is prone to expansion deformation during long-term friction, which reduces the flatness of the sealing end face and causes the sealing medium to leak from the sealing interface. Floating seals are used in large-diameter end face seals, but the axial compression failure of rubber compression during use is more common and it is difficult to achieve the desired results.

Summary of the invention

In view of the deficiencies of the prior art, the present invention provides an axial lip seal device for a rotating shaft, which is less prone to expansion and hardening, and can adapt to changes in shaft roughness and eccentricity, and has good eccentric followability. It can withstand high pressure, has good sealing performance in high speed, high temperature, high dust and corrosive sealing medium environment, high reliability, long service life, simple structure and easy installation.

The technical solution for achieving the object of the present invention is:

The invention relates to an axial lip seal device for a rotating shaft, comprising a non-compensating ring, a compensating ring, a compensating ring seat and a compression spring which are sequentially connected, the upper end surface of the compensating ring is matched with the end surface of the non-compensating ring, and the lower end surface is fixed by the compensating ring seat The lower end surface of the compensation ring seat is fitted to the compression spring, which is different from the prior art.

The compensating ring is an axial lip seal ring, the upper end surface of which is a funnel-shaped sealing end face with a low inner ring and a high outer ring ring, and an outer large and small horizontal V-shaped spring groove is arranged on the back surface of the funnel-shaped sealing end face, and the V shape Self-tightening springs are fitted in the spring slots.

The compression spring is a combined compression spring, comprising an annular ring, upper and lower bosses spaced apart from the upper and lower end faces of the annular ring.

The axial lip seal is made of engineering plastic PTFE plastic, and the filler is molded and burned. Knot forming.

The axial lip seal has a weight distribution ratio of polytetrafluoroethylene plastic to filler of 100:40-50.

The funnel-shaped sealing end surface has a low inclination of the inner ring and an outer ring height of 25-50°.

The self-tightening spring is a spring made of a spring steel wire and connected with a spring with a certain radial self-tightening force.

The annular ring of the combined compression spring is stamped from a spring steel plate or a steel strip.

The upper boss and the lower boss are made of rubber and are respectively wrapped or wrapped on the upper and lower end faces of the annular ring.

The annular ring is coated with a layer of glue when it is in contact with the corrosive sealing medium, and then is formed by vulcanization molding with a fluorine rubber;

The compensation ring seat is formed by drawing and forming a metal frame with an inner flange or an outer flange by a steel plate punching machine, and is subjected to oil removal and rust removal treatment, and the rubber molding is covered, and the inner flange and the outer flange are respectively provided. A radial lip seal that mates with the lower end of the axial lip seal.

The positive effect of the invention is that the elastic force generated by the combined compression spring causes the axial lip seal fixed on the compensation ring seat to adhere to the end face of the non-compensation ring for a long time, and the V-shaped spring groove of the axial lip seal is favorable for The sealing medium cools the heat generated by the friction of the sealing end face, and the sealing medium is pressed on the surface of the V-shaped spring groove to facilitate the pressure bearing capacity of the end face of the axial lip sealing ring, and also facilitates the sealing action of the sealing interface by the front and rear sliding action of the spring; The funnel-shaped sealing end face of the axial lip seal and the non-compensating ring sealing end face are not easy to overheat and overheat when sliding. In the sealing corrosive medium, the self-tightening spring adopts a fluorine rubber O-ring, and the annular ring of the combined compression spring and the metal skeleton of the compensation ring seat are bonded with a corrosion-resistant elastic fluorine rubber to effectively isolate the corrosive medium. The seal is also made of corrosion-resistant elastic fluoro rubber. The funnel-shaped sealing end face of the axial lip seal made of engineering plastic PTFE plastic will deform and fit on the wear groove sealing end face of the non-compensating ring under the long-term action of the combined compression spring and the self-tightening spring. Until the end face of the axial lip seal is worn out; the axial lip seal is made of polytetrafluoro-filled solid lubrication and reinforcing filler, which has good wear resistance, wear-reducing and stability, and greatly improves the shaft for rotating shaft. The service life and reliability of the lip seal.

DRAWINGS

1 is a schematic longitudinal sectional view showing an axial lip seal device for a rotating shaft according to the present invention;

Figure 2 is a schematic view showing the structure of a single lip axial lip seal;

Figure 3 is a schematic view showing the structure of a lip-shaped axial lip seal;

Figure 4 is a schematic view showing the structure of a combined compression spring;

In the figure, 1. Non-compensated ring 2. Compensating ring 3. Compensating ring seat 4. Combined compression spring 5. Funnel-shaped sealing end face 6. V-shaped spring groove 7. Self-tightening spring 8. Annular ring 9. Upper boss 10. Lower boss 11 metal frame 12. Radial lip seal.

detailed description

The content of the present invention is further described below in conjunction with the accompanying drawings and embodiments, but is not intended to limit the invention.

Example:

As shown in FIG. 1 , an axial lip seal device for a rotating shaft comprises a non-compensating ring 1 , a compensating ring 2 , a compensating ring seat 3 and a compression spring 4 which are sequentially connected, and an upper end surface and a non-compensating ring of the compensating ring 2 The end faces of 1 are bonded, and the lower end surface of the compensating ring 2 is fixed by the compensating ring seat 3, and the lower end surface of the compensating ring seat 3 is fitted to the upper boss 9 of the compression spring 4.

As shown in FIG. 2, the compensating ring 2 is a schematic diagram of a single lip axial lip seal ring, and the upper end surface is a funnel-shaped sealing end surface 5 having a low inner ring and an outer ring height, and is disposed on the back surface of the funnel-shaped sealing end surface 5. There is a small inner V-shaped spring groove 6 in the outer large, and a self-tightening spring 7 is arranged in the V-shaped spring groove 6.

As shown in FIG. 3, the compensation ring 2 can also be a schematic diagram of a double lip axial lip seal, which is provided with two axial lip seals, and two axial lip seals are arranged in parallel, axially. The lip seal and the axial lip seal are sealed by a rubber seal ring, and the upper end surface of each axial lip seal is a funnel-shaped seal end face 5 with a low inner ring and a low outer ring, and the inclination is 45°. An outer large and small horizontal V-shaped spring groove 6 is provided on the back surface of the funnel-shaped sealing end surface 5, and a self-tightening spring 7 is disposed in the V-shaped spring groove 6.

As shown in FIG. 4, the compression spring 4 is a combined compression spring, and includes an annular ring 8, an upper boss 9 and a lower boss 10 which are disposed at upper and lower end faces of the annular ring.

The axial lip seal is made of engineering plastic PTFE plastic, and the filler is molded by molding. The weight distribution ratio of the polytetrafluoroethylene plastic to the filler is 100:45, and the filler is solid lubrication. The agent and the reinforcing agent are formed by compression molding, sintering, cooling, etc.; the back surface of the funnel-shaped sealing end face is processed into a V-shaped spring groove by a lathe, and the self-tightening spring in the V-shaped spring groove has a moderate elasticity of the funnel-shaped sealing end face.

The self-tightening spring 7 is a spring made of a spring steel wire and a spring having a certain radial self-tightening force connected end to end;

The annular ring 8 of the combined compression spring is stamped from a spring steel plate or a steel strip;

The upper boss 9 and the lower boss 10 are made of rubber and are respectively wrapped or wrapped on the upper and lower end faces of the annular ring 8. To obtain a larger elastic force, it is only necessary to increase the diameter of the annular ring 8. And increase the number of bosses to achieve results;

The annular ring 8 is coated with a layer of glue when it is in contact with the corrosive sealing medium, and then is formed by vulcanization molding with a fluorine rubber;

The compensation ring seat 3 is a metal frame 11 which is stretched by a steel plate punching machine into an inner flange or an outer flange. After degreasing and derusting treatment, the rubber molding is covered, the inner flange and the outer flange are both A radial lip seal 12 is provided that mates with the lower end face of the axial lip seal.

In use, the non-compensating ring 1, the compensating ring 2, the compensating ring seat 3 and the compression spring 4 are sequentially arranged as an axial lip seal device for the rotating shaft, and the elastic force generated by the compression spring 4 after the force is applied to the upper boss 9 and the lower boss 10 make the annular ring 8 corrugated under the displacement of the displacement, and the upper boss 9 bears against the end surface of the compensation ring seat 3 so as to be fixed on the compensation ring seat 3. The funnel-shaped sealing end face 5 of the axial lip seal 2 is attached to the end face of the non-compensation 1, and as the compression force increases, the sealing interface increases, and the sealing effect increases.

Claims

The invention relates to an axial lip seal device for a rotating shaft, comprising a non-compensating ring, a compensating ring, a compensating ring seat and a compression spring which are sequentially connected, the upper end surface of the compensating ring is matched with the end surface of the non-compensating ring, and the lower end surface is fixed by the compensating ring seat The lower end surface of the compensation ring seat is fitted to the compression spring, and is characterized in that

The compensating ring is an axial lip seal ring, the upper end surface of which is a funnel-shaped sealing end face with a low inner ring and a high outer ring ring, and an outer large and small horizontal V-shaped spring groove is arranged on the back surface of the funnel-shaped sealing end face, and the V shape Self-tightening springs are fitted in the spring slots.

The compression spring is a combined compression spring, comprising an annular ring, upper and lower bosses spaced apart from the upper and lower end faces of the annular ring.
The axial lip seal for a rotating shaft according to claim 1, wherein the axial lip seal is made of an engineering plastic PTFE plastic, and the filler is molded by compression molding.
The axial lip seal for a rotating shaft according to claim 2, wherein the axial lip seal has a weight distribution ratio of polytetrafluoroethylene plastic to filler of 100:40-50. .
The axial lip seal for a rotating shaft according to claim 1, wherein the funnel-shaped sealing end surface has a low inclination of the inner ring and an outer ring height of 25 to 50 degrees.
The axial lip seal device for a rotary shaft according to claim 1, wherein the self-tightening spring is a spring made of a spring steel wire and a spring having a certain radial self-tightening force connected end to end.
The axial lip seal for a rotary shaft according to claim 1, wherein the annular ring of the combined compression spring is stamped from a spring steel plate or a steel strip.
The axial lip seal device for a rotary shaft according to claim 1, wherein said upper boss and lower boss are made of rubber and are respectively wrapped or wrapped around upper and lower end faces of the annular ring. on.
The axial lip seal device for a rotating shaft according to claim 1, wherein the annular ring is coated with a layer of glue to dry the corrosive sealing medium, and then coated with a fluorine rubber vulcanization molding. Made.
The axial lip seal device for a rotating shaft according to claim 1, wherein the compensating ring seat is formed by drawing a steel plate punch into a metal skeleton having an inner flange or an outer flange. The rust removal treatment, the overmolded rubber molding, the inner flange and the outer flange are provided with radial lip seals matching the lower end faces of the axial lip seals.