WO2019148546A1

WO2019148546A1 - Seal combination device for shaft

Info

Publication number: WO2019148546A1
Application number: PCT/CN2018/076284
Authority: WO
Inventors: 王晛
Original assignee: 苏州优德通力科技有限公司
Priority date: 2018-01-31
Filing date: 2018-02-11
Publication date: 2019-08-08
Also published as: CN208237076U

Abstract

Provided is a seal combination device for a shaft. An oil seal cavity is provided between a first sealing element and a second sealing element. The middle of a seal base (1) is provided with a hole (8, 9) perpendicular to an axis of a rotating shaft. A movable plug device is disposed in the hole (8, 9). A gas in the oil seal cavity is reversibly exhausted from the oil seal cavity via the movable plug device. The device can effectively reduce the abrasion of sealing components and prolong the service life thereof, and has a good sealing effect.

Description

Shaft sealing assembly device

Technical field:

The utility model relates to a shaft sealing assembly device, relating to the technical field of fluid mechanical sealing.

Background technique:

At present, the mechanical seals on the market or various types of skeleton oil seals, because of the surface and surface contact, the friction between the hard and the hard is easy to cause the wear of the sealing surface, so that the sealed material leaks, thereby not only affecting the sealing effect but also reducing the service life. .

Utility model content:

The technical problem to be solved by the utility model is to provide a shaft sealing assembly device which has a simple structure and effectively improves the sealing effect.

In order to solve the above technical problems, the present invention is achieved by the following technical solutions:

A shaft sealing assembly device comprising a sealing base, a first sealing member, a second sealing member and a movable plug device, the sealing base being fixed or integral with a component of the application, and between the sealing base and the outer wall of the rotating shaft Forming a sealing cavity, the rotating shaft passes through a sealing cavity in the middle of the sealing base, and the first sealing member and the second sealing member are respectively sleeved on the rotating shaft and placed in the sealing cavity and disposed opposite to each other, the first sealing member and the first sealing member are An oil seal chamber is disposed between the second seals, and a middle of the seal base is provided with an opening perpendicular to an axis of the rotating shaft, and the movable plug device is disposed in the opening, and the gas in the oil seal chamber is reversibly passed through the movable plug device Drain the oil seal chamber.

Preferably, the first sealing member is sleeved on the rotating shaft, the first sealing member comprises a first sealing ring, and the first sealing ring is in sealing contact with the top wall of the sealing chamber, and the tail end of the first sealing ring is vertically oriented The lower bend forms a separating surface of the medium and the lubricating oil, and the lower end of the separating surface of the medium and the lubricating oil is bent toward the front end of the rotating shaft and forms an inclined sealing ring, and the inclined sealing ring has an inclined angle with the outer wall of the rotating shaft, and the inclined sealing The rear end of the ring abuts against the outer wall of the rotating shaft.

Preferably, the angle of the inclination angle of the inclined seal ring is set to 5°-20°.

Preferably, the second sealing member is sleeved on the rotating shaft, the second sealing member comprises a second sealing ring, the second sealing ring is in sealing contact with the top wall of the sealing chamber, and the tail end of the second sealing ring is perpendicular to The lower bend forms an oil retaining surface, and the lower end of the oil retaining surface is horizontally bent toward the front end of the rotating shaft to form an oil sealing ring, and the sealing oil sealing ring abuts against the outer wall of the rotating shaft.

Preferably, the sealing oil seal ring is provided with a V-shaped groove on one side of the rotating shaft.

Preferably, the angle of the apex angle of the V-groove is set to 5°-30°.

Preferably, the movable plug device comprises a oil plug, a spring, a spring fixing sleeve and a ball, and the oil plug is provided with a vent hole penetrating through the plug body and fixed on the sealing base, the vent hole and the oil seal cavity Connected, the vent hole is set as a stepped hole and the upper part is a large-diameter hole, the ball is placed in the large-diameter hole, and the spring fixing sleeve is fixed to the upper end hole of the large-diameter hole and has a vent hole, and the spring is disposed It is fitted into the large diameter hole and is coupled with the ball and the spring fixing sleeve.

Preferably, the lower aperture of the large diameter aperture is configured as a tapered aperture that mates with the ball.

Preferably, an isolation sleeve is disposed between the first sealing member and the second sealing member.

Preferably, the rear portion of the second sealing member is provided with a spacer and a hole retaining ring fixed to the sealing base and surrounding the rotating shaft.

Compared with the prior art, the utility model has the advantages that the shaft sealing assembly device can effectively reduce the wear of the sealing component, improve the service life, has a wide application range, and has good sealing effect, high reliability, and manufacturing cost. Low, so it has high practicability and economic benefits, suitable for popularization and application.

BRIEF DESCRIPTION OF THE DRAWINGS:

The utility model is further described below with reference to the accompanying drawings:

1 is a schematic cross-sectional structural view of a front portion of the present invention;

2 is a partial cross-sectional structural view of the movable plug device of the present invention.

Detailed ways:

The technical solutions in the embodiments of the present invention are clearly and completely described below. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts are within the scope of the protection of the present invention:

A shaft sealing assembly device as shown in FIG. 1 and FIG. 2, comprising a sealing base 1, a first sealing member, a second sealing member and a movable plug device, wherein the sealing base is fixed or composed of components of an application. In one piece, a sealing cavity is formed between the sealing base and the outer wall of the rotating shaft, the rotating shaft passes through a sealing cavity in the middle of the sealing base, and the first sealing member and the second sealing member are respectively sleeved on the rotating shaft and placed in the sealing cavity. The oil seal chamber 3 is disposed between the first seal member and the second seal member, and the oil seal chamber is provided with lubricating oil, thereby effectively lubricating the first seal member and the second seal member to reduce wear. .

The middle of the sealing base is provided with an opening perpendicular to the axis of the rotating shaft, and the movable plug device is disposed in the opening, and the gas in the oil sealing chamber is reversibly discharged through the movable plug device, in this embodiment, In order to improve the stability of the exhaust process, the movable plug device comprises an oil plug 4, a spring 5, a spring fixing sleeve 6 and a ball 7, and the oil plug is provided with a vent hole penetrating the plug body and fixed on the sealing base. (增增), the vent hole is in communication with the oil seal cavity, the vent hole is provided as a stepped hole and the upper part is a large diameter hole 8 , the lower part is a small diameter hole 9 , and the ball is placed in the large diameter hole 8 , further Ground, when the ball is placed at the joint between the large diameter hole and the small diameter hole, the upper hole of the small diameter hole is provided as a tapered hole 10 matched with the ball, so that the ball can be combined with the upper hole of the small diameter hole The sealing is sealed to prevent the outside air from entering the small diameter hole, the diameter of the ball is smaller than the diameter of the large diameter hole, the spring fixing sleeve is fixed to the upper end opening of the large diameter hole and the vent hole 24 is opened, and the spring is placed in the large diameter hole Fitted with ball and spring retaining sleeve Join. When the ball is not subjected to external force, the ball will be pressed against the conical orifice under the action of spring and gravity. When the gas enters from the lower part of the small diameter hole and pushes the ball away from the conical orifice and moves upward, then the gas enters the big The inside of the diameter hole is discharged through the vent hole of the spring fixing sleeve, and then the pressure in the oil sealing chamber is balanced.

In order to improve the sealing effect, the first sealing member is sleeved on the rotating shaft, and the first sealing member comprises a first sealing ring 11 , the first sealing ring is in sealing contact with the top wall of the sealing chamber, and the tail of the first sealing ring The end is bent vertically downward and forms a separating surface 12 of the medium and the lubricating oil, and the lower end of the separating surface of the medium and the lubricating oil is bent toward the front end of the rotating shaft and forms an inclined sealing ring 13 which is opposite to the outer wall of the rotating shaft There is a tilt angle 14 therebetween, and the tail end of the inclined sealing ring abuts against the outer wall of the rotating shaft. As a preferred embodiment, the angle of the tilting angle is set to 5°-20°. In practical applications, the first sealing ring The separation surface of the medium and the lubricating oil and the inclined sealing ring are integrally formed and enclosed in a groove-like structure, and a choke chamber 15 for preventing liquid leakage is formed between the three and the rotating shaft, and the liquid passes through the choke chamber. The slanting seal ring generates radial pressure, which in turn makes the slanted seal ring and the rotating shaft more closely fit, thereby effectively improving the sealing effect.

In this embodiment, the second sealing member is sleeved on the rotating shaft, and the second sealing member includes a second sealing ring 16, the second sealing ring is in sealing contact with the top wall of the sealing chamber, and the second sealing ring is The tail end is bent vertically downward and forms a slinger surface 17, and the lower end of the oil taring surface is horizontally bent toward the front end of the rotating shaft to form an oil sealing ring 18, and the sealing oil sealing ring and the outer wall are abutted against each other. Further, a V-shaped groove 19 is provided on one side of the sealing oil sealing ring and the rotating shaft, and the angle of the apex angle of the V-shaped groove is set to 5°-30°.

The oil seal chamber is enclosed between the second seal ring, the oil retaining surface, the seal oil seal ring and the first seal member, and the oil seal chamber is provided with lubricating oil, and then the contact portion of the seal oil seal ring and the rotating shaft is lubricated to reduce The wear of the contact surface and the V-groove structure of the sealing oil seal ring make it have two supporting contact faces with the outer wall of the rotating shaft, and the front supporting contact surface effectively avoids leakage of lubricating oil in the oil sealing cavity, and the rear support The surface is effective to prevent external foreign matter from entering the oil seal chamber, and the sealing effect is good.

Further, in order to improve the sealing effect, an annular spring 23 sleeved thereon may be disposed on both the first sealing member inclined sealing ring and the sealing member sealing ring of the second sealing member.

Therefore, in practical applications, the pressure of the liquid liquid to be sealed is P1, and when the rotating shaft rotates, the lower end of the second sealing ring rotates relative to the rotating shaft to generate heat, which in turn causes the lubricating oil in the oil sealing chamber. Generate pressure, set the oil pressure to P2, and then set the elastic force of the spring to the ball to P3. Therefore, during actual operation, the product of P1 and the cosine of the first inclination angle is greater than P2, and when P2 is greater than At P3, the pressure in the oil seal chamber is discharged through the vent hole, and the faster the rotation speed of the shaft, the greater the pressure of the P2, so that even if the shaft rotates at a high speed, the sealing effect of the sealing device can be effectively maintained.

For ease of installation, a spacer sleeve 20 is disposed between the first seal and the second seal.

In addition, in order to further improve the sealing effect and the stability of the overall structure, the rear portion of the second sealing member is provided with a gasket 21 and a hole retaining ring 22 which are fixed to the sealing base and surround the rotating shaft.

The above shaft sealing assembly device can effectively reduce the wear of the sealing component, improve the service life, has a wide application range, has good sealing effect, high reliability, low production cost, and thus has high practicability and high economic efficiency.

It should be emphasized that the above is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any form. Any simple modification or equivalent change to the above embodiment in accordance with the technical essence of the present invention is Modifications are still within the scope of the technical solutions of the present invention.

Claims

A shaft sealing assembly characterized by comprising a sealing base, a first sealing member, a second sealing member and a movable plug device, the sealing base being fixed or integral with the components of the application, the sealing base and the sealing base A sealing cavity is formed between the outer walls of the rotating shaft, and the rotating shaft passes through the sealing cavity in the middle of the sealing base, and the first sealing member and the second sealing member are respectively sleeved on the rotating shaft and placed in the sealing cavity and disposed opposite to each other. An oil seal chamber is disposed between a sealing member and the second sealing member, and an opening of the sealing base is perpendicular to an axis of the rotating shaft, and the movable plug device is disposed in the opening, and the gas in the oil sealing chamber is reversible The oil seal chamber is discharged through the movable plug device.
The shaft sealing assembly device according to claim 1, wherein the first sealing member is sleeved on the rotating shaft, the first sealing member comprises a first sealing ring, and the first sealing ring is The top wall of the sealing chamber is in sealing contact, the tail end of the first sealing ring is bent vertically downward to form a separating surface of the medium and the lubricating oil, and the lower end of the separating surface of the medium and the lubricating oil is bent toward the front end of the rotating shaft and forms an inclined sealing ring. The inclined sealing ring has an inclination angle with the outer wall of the rotating shaft, and the tail end of the inclined sealing ring abuts against the outer wall of the rotating shaft.
A shaft seal assembly according to claim 2, wherein the angle of inclination of the inclined seal ring is set to 5-20.
The shaft sealing assembly device according to claim 1, wherein the second sealing member is sleeved on the rotating shaft, and the second sealing member comprises a second sealing ring, the second sealing ring and The top wall of the sealing chamber is in sealing contact, and the tail end of the second sealing ring is bent vertically downward to form an oil retaining surface, and the lower end of the oil retaining surface is horizontally bent toward the front end of the rotating shaft to form an oil sealing ring, and the sealing oil sealing ring is The outer walls are fitted against each other.
A shaft seal assembly according to claim 4, wherein a side surface of the seal seal ring that is fitted to the rotating shaft is provided with a V-shaped groove.
A shaft seal assembly according to claim 5, wherein the angle of the apex angle of said V-shaped groove is set to 5 to 30.
The shaft seal assembly device according to claim 1, wherein the movable plug device comprises an oil plug, a spring, a spring fixing sleeve and a ball, and the oil plug is provided with a vent hole penetrating the plug body and Fixing on the sealing base, the vent hole is in communication with the oil seal cavity, the vent hole is arranged as a stepped hole and the upper part is a large diameter hole, the ball is placed in the large diameter hole, and the spring fixing sleeve is fixed at the large diameter The upper end opening of the hole is open with a venting hole, and the spring is placed in the large diameter hole and is coupled with the ball and the spring fixing sleeve.
A shaft seal assembly according to claim 1, wherein the lower opening of the large diameter hole is provided as a tapered opening that cooperates with the ball.
The shaft sealing assembly device according to claim 1, wherein an isolation sleeve is disposed between the first sealing member and the second sealing member.
A shaft seal assembly according to claim 1, wherein the rear portion of the second seal member is provided with a gasket and a hole retaining ring fixed to the seal base and surrounding the rotating shaft.