WO2012094954A1

WO2012094954A1 - Composite sealing device

Info

Publication number: WO2012094954A1
Application number: PCT/CN2012/000048
Authority: WO
Inventors: 周承惠; 周磊; 张相安; 张相新
Original assignee: 北京纽希液压技术研究所
Priority date: 2011-01-14
Filing date: 2012-01-11
Publication date: 2012-07-19
Also published as: CN102588608A

Abstract

A composite sealing device, consisting of sealing device blocks (1, 8), n-shaped sealing rings (5, 6) and an O-ring, an Yx-shaped sealing ring or a combination sealing element (10). The inner cavity of each n-shaped sealing ring is hollow, and the sealing force in the inner cavity is directly from the pressure of the working medium and is in self-dynamic balance at any time during operation, and does not affect the working condition of the O-ring, the Yx-shaped sealing ring or the combination sealing element. The composite sealing device combines the properties of the sealing technologies of n-shaped sealing rings as well as O-ring, Yx-shaped ring or combination sealing element, has the characteristics of simple modification and processing, low medium leakage, high pressure resistance and long service life, and can be used as a piston sealing device and an end cover sealing device for various types of hydraulic equipment.

Description

Description A composite sealing device

Technical field

The present invention relates to a sealing device, and more particularly to a composite sealing device. It belongs to the field of fluid transmission sealing technology.

Background technique

Sealing technology is of great significance for preventing "three leaks" of oil and gas products (oil, gas, water), ensuring safe operation, improving work performance and efficiency, saving energy and protecting the environment.

As we all know, the traditional rubber seals such as 0-rings, Yx-shaped rings and U-shaped rings are generally used to seal the seal ring from the outside of the seal ring body. When the working pressure exceeds a certain value, the rubber seal element will be produced. Yield deformation, the working medium will pass through the sealing tape to cause leakage of the medium, which will invalidate the seal, gradually reduce the working efficiency of the equipment, increase the energy consumption, form the working environment pollution, cause serious production safety accidents, cause economic losses and personnel. casualties. Since the conventional rubber sealing device is pre-stressed by the extrusion deformation during assembly to achieve the sealing effect, the rubber sealing member is in a deformed state for a long time, and is prone to permanent deformation and loss of elasticity, and can not maintain a good sealing effect for a long time, working life. short. Moreover, the conventional elastic material sealing technology adopts a 0-ring and a Y-shaped ring, etc., regardless of the pressure, a rigid material ring support is required, so that the existing main body is prone to jamming and the like during operation. The combined sealing element developed in recent years is essentially an O-ring and a Yx-shaped ring that dissimilate the rigid material support ring. The sealing mechanism is basically the same as that of elastic material seals such as 0-ring and Yx-shaped ring. It is not a true elastic material sealing technology. There is always a problem of medium leakage, and the sealing effect is not ideal or resistant. Very high pressure. There is also the instability caused by the rigid material collar support, which can cause work failures during the operation of the existing mainframe. Especially when two or more combined sealing elements are used at the same time, the number of rigid material supporting ring sleeves is actually increased, the working failure is more likely to occur, the manufacturing process difficulty of the main machine is increased, the processing precision is required, and the main machine cost is greatly increased. . Not only the economic benefits are poor, but also the consumption of material resources is large. With the development of industrial modernization and automation, the use conditions of electromechanical products are increasingly severe, and the requirements for sealing process performance are constantly updated and higher.

Summary of the invention

SUMMARY OF THE INVENTION It is an object of the present invention to provide a novel sealing device which has low dielectric leakage, high pressure resistance, long service life and reduced cost.

The inventive idea of the invention is:

The sealing device of the invention is a conventional O-ring, Yx ring or a combined seal developed in recent years. An n-shaped sealing ring is added to the component sealing device to form a composite sealing device.

The technical solution of the present invention is implemented as follows:

On the existing 0-ring, Yx-shaped ring or combined sealing element sealing device, an n-shaped sealing ring seating groove is opened near one end of the working medium acting direction, and a guiding medium is opened on the end surface of the sealing device near the working direction of the working medium to enter each η The passage hole of the inner cavity of the seal ring.

The characteristics are as follows: 1) The n-shaped sealing ring is placed in the mounting groove of the n-shaped sealing ring, and the number of the rows of the n-shaped sealing ring is determined according to the process performance; the sealing working surface of the n-shaped sealing ring has at least one boss. The inside of the working face of the n-shaped seal ring and the sides of the seal ring constitute a hollow inner cavity. 2) The sealing device block is close to the working medium. The end surface of one end has a passage hole leading to each sealing ring to guide the medium into the inner cavity of the n-shaped sealing ring, and the channel holes are shared or separately branched. 3) A groove is formed on the cylindrical working surface of the sealing device near one end of the working medium. The number of grooves is from zero, which is determined by the process performance. 4) The sealing device for the sealing device of the sealing device of the present invention and the sealing device for the hole.

Advantages and benefits of the present invention:

Since the sealing device of the present invention adds an n-shaped sealing ring to the existing O-ring, Yx-shaped ring or combined sealing element sealing device to form a composite sealing device, the composite sealing device of the present invention simultaneously has an n-shaped sealing ring 5, 6 And the sealing process performance of the O-ring, the Yx-shaped ring or the combined sealing element 10, compared with the existing various types of sealing devices, has the advantages of low dielectric leakage, high pressure resistance, long working life, and the like. Compared with the type of sealing device, it has the characteristics of small medium leakage, pressure resistance, good sealing effect and long service life.

The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments:

BRIEF DESCRIPTION OF THE DRAWINGS:

Figure 1 and Figure 2 are cross-sectional views of the composite sealing device for the shaft in which the working medium acts in both directions.

Figure 3 and Figure 4 are cross-sectional views of the composite sealing device for the shaft in which the working medium acts unidirectionally.

Figure 5 is a cross-sectional view of the composite sealing device for the hole in which the working medium acts in both directions

Figure 6 is a cross-sectional view of the composite sealing device for the hole in which the working medium acts in one direction

Figure 7 is a cross-sectional view of the n-shaped seal ring for the shaft

Figure 8 is a cross-sectional view of the n-shaped seal ring for the hole

detailed description:

As can be seen from Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, the working direction of the working medium of the existing O-ring, Yx ring or combined sealing element 10 on the sealing device blocks 1, 8 is added at one end. Open a number of n-ring seals to place the slots. The n-shaped sealing rings 5, 6 are installed in the sealing groove, and the n-shaped sealing rings 5, 6 are dense. The sealing work surface has a boss 9, and the inner side of the working surface of the n-shaped sealing rings 5, 6 and the two sides of the sealing ring constitute a hollow inner cavity 7. The end faces of the sealing device block 1 and 8 close to the working direction of the working medium are provided with a passage hole 4 for guiding the medium into the inner cavity 7 of each of the n-shaped sealing rings 5 and 6. The passage hole 4 and each of the n-shaped sealing ring seating grooves communicate with each other. The passage holes 4 are shared or separated separately. The sealing block 1 and 8 are provided with a groove 1 1 on a cylindrical working surface near one end of the working medium. The number of the grooves 11 is determined from zero, which is determined by the process performance.

As can be seen from Figures 1, 2, 3 and 4, when the sealing device of the present invention is used as a shaft sealing device, the existing O-ring, Yx ring or combined sealing member 10 on the sealing device block 1 A certain number of n-shaped sealing ring seating grooves are added to one end of the working medium acting direction, and the shaft is mounted in each of the mounting grooves by the n-shaped sealing ring 5; the guiding medium is opened on the end surface of the sealing device block 1 near one end of the working medium The passage holes 4 entering the respective inner cavity 7 of the seal ring can guide the medium into the inner cavity 7 of the n-shaped seal ring 5 for the shaft. Since the n-shaped seal ring 5 is at one end of the composite sealing device in the direction in which the working medium acts, the n-shaped seal ring 5 first serves as a seal. After the main body starts working, the inner cavity 7 of the n-shaped seal ring 5 is filled with medium. Due to the effect of the installation size, the working face of the n-ring 5 is in close contact with the sealing face of the cylinder 2. When the pressure is increased, the medium pressure is transmitted from the medium to the inner cavity 7 of the n-shaped sealing ring 5 via the passage hole 4, so that the sealing surface of the shaft with the n-shaped sealing ring 5 and the sealing working surface of the cylinder 2 are in close contact with each other. The shaft shaft seals the boss 9 on the working surface with the n-shaped sealing ring 5 and the groove 1 1 on the cylindrical working surface of the sealing device block 1 to form a labyrinth seal, and the pressure is gradually attenuated when the medium passes, and the medium traverse leakage phenomenon does not occur. Excellent sealing results. And the greater the medium pressure, the tighter the sealing surface of the shaft with the n-shaped sealing ring 5 and the sealing working surface of the cylinder 2, the better the sealing effect, as long as the sealing ring body is not crushed, the sealing effect is always good. of. Since the inner cavity 7 of the n-shaped sealing ring 5 is hollow, the sealing force in the inner cavity 7 of the n-shaped sealing ring 5 is directly from the working medium pressure, so the working medium pressure in the inner cavity 7 of the n-shaped sealing ring 5 is at any time during the working of the main body. Dynamic balancing does not affect the operation of the rear O-ring, Yx-ring or combined sealing element 10.

The composite sealing device of the present invention shown in Figures 5 and 6 is used as a sealing device for a hole, and the existing O-ring, Yx-ring or combination sealing member 10 on the sealing device block 8 is opened at the end of the working medium. A certain number of n-shaped sealing rings are placed in the slots, and the holes are respectively installed in the respective mounting slots by the n-shaped sealing ring 6; the guiding device 8 opens the guiding medium into the inner cavity of each of the n-shaped sealing rings 6 on the end surface of the sealing device 8 near the working direction of the working medium. The passage hole 4 of 7 can be used to introduce the medium into the inner cavity 7 of the n-shaped seal ring 6. Since the n-shaped seal ring 6 is at one end of the composite sealing device in the direction in which the working medium acts, the n-shaped seal ring 6 first serves as a seal. After the main body starts working, the inner cavity 7 of the n-shaped seal ring 6 is filled with the medium. Due to the effect of the installation size, the working face of the n-shaped sealing ring 6 abuts against the sealing working surface of the piston rod 3. When the pressure is increased, the medium 12 000048

The pressure is transmitted from the medium to the inner cavity 7 of the n-shaped sealing ring 6 via the passage hole 4, so that the sealing surface of the shaft with the n-shaped sealing ring 6 and the sealing working surface of the piston rod 3 are in close contact, and the n-shaped sealing ring is used for each hole. 6 The boss 9 on the sealing working surface and the groove 11 on the cylindrical working surface of the sealing device block 8 form a labyrinth seal, and the pressure is gradually attenuated when the medium passes, and the medium does not pass through the leakage phenomenon, and an excellent sealing effect is obtained. And the greater the medium pressure, the tighter the sealing surface of the hole with the n-shaped sealing ring 6 and the sealing working surface of the piston rod 3, the better the sealing effect, as long as the sealing ring body is not crushed, the sealing effect is always good. of. Since the inner cavity 7 of the n-shaped sealing ring 6 is hollow, the sealing force in the inner cavity 7 of the n-shaped sealing ring is directly from the working medium pressure, so the working medium pressure in the inner cavity 7 of the n-shaped sealing ring 6 is self-moving at any time during the operation of the main body. Balance does not affect the operation of the original O-ring, Yx-ring or combination sealing element 10.

It can be clearly seen from the figure that in the composite sealing device of the present invention, the medium pressure applies pressure to the sealing ring body from the inner cavity of the n-shaped sealing ring 5, 6 so that the sealing faces of the n-shaped sealing ring 5, 6 are tightly fitted. In the sealing part of the equipment to be sealed, the entire rubber sealing ring is evenly stressed under the pressure of the medium, the deformation is small, and no permanent deformation occurs; the n-shaped sealing rings 5, 6 can be used for a long time. The inside maintains good elasticity, so the working life of the n-shaped seal is much longer than that of the conventional rubber seal. The composite sealing device of the invention has the sealing process performance of the n-shaped sealing ring 5, 6 and the 0-ring, the Yx-shaped ring or the combined sealing member 10, and has low dielectric leakage compared with various existing types of sealing devices. Excellent characteristics such as high pressure resistance and long working life.

Industrial applicability

Since the n-shaped sealing ring and the existing O-ring, Yx-shaped ring or combined sealing element 10 are used to form a composite seal, the composite sealing device of the invention reduces medium leakage, withstands high pressure, prolongs working life, and obtains a better sealing effect. It will be widely used in hydraulic machinery. The sealing device can be used as a piston sealing device and an end cap sealing device for various types of equipment. The existing sealing device using an O-ring, a Y-shaped ring or a combined sealing component only needs to be simply modified and processed, and the present invention can be used. Invention of a composite sealing device.

Claims

Claim

1. A composite sealing device consisting of a sealing device block (1), (8), an n-shaped sealing ring (5),

(6), and 0-ring, Yx-shaped ring or combined sealing element (10); characterized in that: the working surface has a boss (9), the inside of the working face and the sides of the sealing ring form a hollow cavity (7) The n-shaped seals (5), (6) are placed in the seal block (1),

(8) The n-shaped sealing ring on one end of the working medium is placed in the groove, in front of the 0-ring, the ring or the combined sealing element (10); the sealing device block (1),

(8) An end face close to one end of the working medium is provided with a passage hole (4) for guiding the medium into each of the n-shaped seal rings (5) and (6) the inner cavity (7).

2. The composite sealing device according to claim 1, wherein: the sealing device block

(1), (8) There is a certain number of grooves (11) on the cylindrical working surface near one end of the working medium acting direction. The number of grooves (11) is from zero, which is determined by the process performance.

3. The composite sealing device according to claim 1, wherein the composite sealing device is provided with a sealing device for the shaft and a sealing device for the hole, and can be used as a piston sealing device and a cap sealing device.