WO2009092300A1

WO2009092300A1 - Multi-seal n-type sealing arrangement

Info

Publication number: WO2009092300A1
Application number: PCT/CN2009/070029
Authority: WO
Inventors: Chenghui Zhou; Lei Zhou; Xiang'an Zhang; Xiangxin Zhang
Original assignee: Beijing New Seal Institute Of Hydraulic Technology
Priority date: 2008-01-08
Filing date: 2009-01-05
Publication date: 2009-07-30
Also published as: CN101482179A

Abstract

A multi-seal n-type sealing arrangement is comprised of a seal member (5) and an n-type sealing ring (1,2). The seal member (5) are provided with at least one mounting groove (4) of the sealing ring and a through hole (9) for connecting the mounting groove (4) to the end surface of the seal member (5), the n-type sealing ring (1,2) being located in the mounting groove (4) of the sealing ring. In addition, grooves (8) are provided on the working surface of the seal member (5) and protuberances (3) are provided on the working surface of the n-type sealing ring (1,2). The through hole (9) may be connected to multiple mounting grooves (4) of thesealing ring or only one mounting groove (4) of the sealing ring. The n-type sealing ring (1,2) has an axle structure type and a bore structure type. The sealing arrangement of the present invention has advantages of high compression resistance, little leakage and long life.

Description

Multiple n-type sealing device

The present invention relates to a sealing device, and more particularly to a multiple n-type sealing device, which belongs to the field of 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 is known to all, the conventional rubber seals such as Type 0, Yx, and U are commonly used. When the working pressure exceeds a certain value, the rubber sealing element will undergo yield deformation, and the working medium will pass through the sealing tape to cause leakage of the medium. The failure of the seal will gradually reduce the working efficiency of the equipment, increase the energy consumption, form a pollution of the working environment, and cause serious production safety accidents, resulting in economic losses and casualties. Since the sealing ring is squeezed from the outside of the sealing ring body, the conventional rubber sealing device is pre-stressed by the extrusion deformation during assembly to achieve the sealing effect, so that the rubber sealing member is in a deformed state for a long time, and the permanent deformation is easily lost. Elasticity, can not maintain a good sealing effect for a long time, and has a short working life. 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 have become increasingly harsh, making the use of rubber seals more and more demanding, and constantly updating and higher requirements on the process performance of seals.

Summary of the invention

It is an object of the present invention to provide a pressure-resistant, long-life sealing device. It can replace the traditional rubber seals and is suitable for the production of various new mechanical equipment and equipment for the use of traditional rubber seals. Since multiple seals are used and the cross-sectional shape of the seal member is n-shaped, it is called a multiple n-type seal.

The inventive idea of the invention is as follows: a sealing device block having a groove on the working surface of the cylinder and having a plurality of sealing ring seating grooves, and the passage hole on the end surface of the sealing device block guiding the medium into the inner cavity of each sealing ring and the working surface has The hollow n-shaped sealing ring of the boss constitutes the sealing device of the present invention.

The specific technical solution of the present invention is:

A multiple n-type sealing device, wherein: the sealing device block and the n-type sealing ring; the sealing device block is provided with at least one sealing ring seating groove 4; the sealing device block is provided with a passage hole for communicating the sealing ring seating groove and The end face of the sealing block; the n-shaped sealing ring is located in the sealing groove.

In the above multiple n-type sealing device, the working surface of the sealing device block is provided with a groove.

In the above multiple n-type sealing device, one passage hole communicates with a plurality of sealed seating grooves or one passage hole communicates with a sealed seating groove. In the above multiple n-type sealing device, the n-shaped sealing ring is a shaft structure or a hole structure.

The multiple n-type sealing device according to claim 1, wherein the inner side of the working face of the n-shaped seal ring and the both sides of the seal ring constitute a hollow inner cavity.

In the above multiple n-type sealing device, the sealing surface of the sealing ring is provided with a boss.

Its characteristics are: 1) There are a certain number of grooves on the cylindrical working surface of the sealing device block; the quantity is from zero, and the required quantity is not limited. 2) Multiple n-type sealing device for the shaft sealing device and the hole sealing device, characterized in that: the working face of the multi-n-type sealing device for the shaft is the outer ring; the working face of the multi-n-type sealing device for the hole is the inner ring; 3) There are a plurality of sealing ring mounting grooves on the sealing device block, and the number of the channels is determined according to the process performance requirements, and the number is not limited; 4) the end face of the sealing device block has a passage hole leading to each sealing ring to place the groove, guiding the medium into the n-shaped sealing The inner cavity of the ring, the passage holes can be shared, or can be separated separately; 5) The n-shaped seal ring has two types of shaft seal ring and hole seal ring; 6) the inner side of the n-type seal ring and the seal ring The side constitutes a hollow inner cavity, and the sealing working surface of the sealing ring has a boss. The number of the bosses is determined according to the working performance and technical parameters such as the pressure required for use, and the number is from zero to the required number. 7) The n-ring can be placed directly on the joint where the equipment needs to be sealed.

Advantages and benefits of the present invention:

Since the sealing device of the invention adopts a plurality of n-shaped sealing rings to form multiple seals, a better sealing effect can be obtained, the medium leakage is greatly reduced, and the working life is further extended. Compared with various types of existing sealing devices, it has excellent pressure resistance, good sealing effect, small leakage and long life. It can be used in a variety of different types of equipment, equipment that originally uses other types of sealing devices, and the sealing device of the present invention can be used as long as it is simply modified.

The invention is further described below in conjunction with the drawings and specific embodiments.

DRAWINGS

Figure 1 is a cross-sectional view of a multiple n-type sealing device sharing the same passage hole;

Figure 2 is a cross-sectional view of a multiple n-type sealing device with independent passage holes;

Figure 3 is a schematic view of the n-shaped seal ring for the shaft (left) and a cross-sectional view of the A-A (right);

Figure 4 is a cross-sectional view of the hole with an n-shaped seal (left) and a cross-section of the A-A (right);

Figure 5 is a cross-sectional view of a multiple n-type sealing device used as a piston seal in a hydraulic cylinder.

detailed description

Example 1

As shown in FIGS. 1 to 5, a sealing device block 5 having a plurality of sealing ring seating grooves 4 having a groove 8 on a cylindrical working surface, and a passage hole for guiding the medium into the inner cavity of each sealing ring on the end surface of the sealing device block 5 9 and hollow n-shaped sealing rings 1, 2 having bosses 3 on the working surface constitute the sealing device of the present invention. Its characteristics are as follows: 1) There are a certain number of grooves 8 on the cylindrical working surface of the sealing device block 5; the number is from zero to the required number. 2) Multiple n-type sealing device for the shaft sealing device and the hole sealing device, characterized in that: the working face of the multi-n-type sealing device for the shaft is the outer ring; the working face of the multi-n-type sealing device for the hole is the inner ring; 3) The sealing device block 5 is provided with a plurality of sealing ring mounting grooves 4, the number of the channels is determined according to the process performance requirements, and the number is not limited; 4) the end surface of the sealing device block 5 has a passage hole 9 leading to each sealing ring to place the groove 4, guiding The medium enters the inner cavity of the n-shaped sealing ring 1, 2, and the passage holes 9 can be shared or separated separately; 5) the n-shaped sealing ring 1 and 2 have two types of shaft sealing ring 1 and hole sealing ring 2; The inner side of the working surface of the n-type sealing ring 1, 2 and the two sides of the sealing ring constitute a hollow inner cavity, and the sealing working surface of the sealing ring has a boss 3, and the number of the boss 3 is in accordance with the working pressure and other technical parameters and technical parameters. However, the quantity is from zero to the required number. 7) The n-ring seals 1, 2 can be placed directly on the joint where the equipment needs to be sealed.

As can be seen from FIG. 1 and FIG. 2, a plurality of sealing ring seating grooves 4 are formed in the sealing device block 5, and a certain number of grooves 8 are formed on the cylindrical working surface of the sealing device block 5, and the n-shaped sealing ring 1 is 2 is installed in the seal ring seating groove 4; the end face of the seal block 5 has a plurality of passage holes 9 and each seal ring seating groove 4 communicates with each other. The passage holes 9 can be used in combination or separately.

As shown in Fig. 3, the shaft in Fig. 3 has an n-shaped sealing ring 1 having a certain number of bosses 3 on the sealing working surface, and the outer diameter L of the shaft-shaped n-ring 1 is similar to the inner diameter of the cylinder 7.

As shown in Fig. 4, the hole in Fig. 4 uses an n-shaped sealing ring 2 having a certain number of bosses 3 on the sealing working surface, and the inner diameter D of the hole-shaped n-ring 2 is similar to the outer diameter of the piston rod 6.

As can be seen from FIG. 5, when the multiple n-type sealing device is used as the piston sealing device of the liquid and pneumatic cylinders, a plurality of sealing ring seating grooves 4 are respectively opened at the end faces of the piston block 10, and the n-shaped sealing ring 1 is They are respectively installed in the respective mounting slots 4; a plurality of passage holes 9 are formed in the two end faces of the piston block 10 to the respective sealing ring seating slots 4, and the medium can be introduced into the inner cavity of the n-shaped sealing ring 1 for the shaft, the liquid and the pneumatic cylinder After starting work, the inner cavity of the seal is filled with media. Due to the preload force during installation, the working face of the n-shaped sealing ring 1 abuts against the sealing working surface of the cylinder block 7. When the pressure is increased, the medium pressure is transmitted from the medium to the inner cavity of the sealing ring through the end passage hole 9, so that the sealing surface of the shaft with the n-shaped sealing ring 1 and the sealing working surface of the cylinder 7 are in close contact with each other. N-shaped sealing ring 1. The n-shaped sealing ring for the shaft 1 The sealing table 3 on the sealing working surface and the groove 8 on the cylindrical working surface of the piston block 10 form a labyrinth seal, and the pressure is gradually attenuated when the medium passes, and no medium crossing occurs. Leakage, excellent sealing results. And the greater the medium pressure, the tighter the sealing surface of the shaft with the n-shaped sealing ring 1 and the sealing working surface of the cylinder block 7, the better the sealing effect, as long as the sealing ring body is not crushed, the sealing effect is always good. of. Due to the use of multiple n-ring seals, the working life is extended and the number of passes for the n-ring seal 1 is determined by process performance requirements. Multiple n-type seals can also be used as end cap seals for liquid and pneumatic cylinders. The end caps are multi-n-type seals with multiple n-type seals. Figure 5 shows an end cap n-type sealing device. The corresponding end of the cylinder inner end surface of the end cap 11 is provided with a passage hole 9 leading to each sealing ring seating groove 4, and the medium introduction hole can be sealed with an n-shape. After the inner cavity of the ring 2 and the liquid and pneumatic cylinders start working, the hollow inner cavity of the sealing ring is filled with the medium. When the liquid and pneumatic cylinders are in operation, the medium pressure is transmitted from the medium to the inner cavity of the sealing ring through the end passage hole 9 so that the sealing surface of the n-shaped sealing ring 2 and the sealing working surface of the piston rod 6 are in close contact with each other. Each hole uses an n-shaped sealing ring 2, and the hole seals the boss 3 on the working surface with the n-shaped sealing ring 2 and the groove 8 on the cylindrical working surface of the end cover 11 to form a labyrinth seal, and the pressure gradually decreases when the medium passes. No media traverse leakage occurs and an excellent sealing effect is achieved. And the greater the medium pressure, the tighter the sealing surface of the hole with the n-shaped sealing ring 2 and the sealing working surface of the piston rod 6, the better the sealing effect, as long as the sealing ring body is not crushed, the sealing effect is always good. The number of holes for the n-shaped seal ring 2 is determined by the process performance requirements.

It can be clearly seen from Figures 1 and 2 that in the multiple n-type sealing device, the medium pressure exerts pressure on the sealing ring body from the inner cavity of the sealing ring, so that the sealing sealing working surface is tightly attached to the joint portion to be sealed of the device. The n-shaped sealing ring, the boss 3 on the working surface of the n-shaped sealing ring and the groove 8 on the cylindrical working surface of the sealing device block 5 form a labyrinth seal, effectively preventing the leakage of the medium and achieving a very good sealing effect. Therefore, the pressure range of multiple n-type seals is far greater than that of conventional rubber seals. At the same time, the medium pressure is sealed from the inside by pressing the sealing ring body. Under the pressure of the medium, the entire rubber sealing ring is evenly stressed, the deformation is small, and no permanent deformation occurs; the n-shaped sealing rings 1, 2 can be It maintains good flexibility for a long period of time, so the working life of the n-ring is much longer than that of a conventional rubber seal. Compared with the existing various types of sealing devices, the sealing device of the invention has the advantages of high pressure resistance, small medium leakage and long service life. The sealing device can be used as a sealing device for piston devices, end caps and various types of equipment. The n-ring can be used directly.

Industrial applicability

Since the sealing device of the invention adopts a plurality of n-shaped sealing rings to form multiple seals, a better sealing effect can be obtained, the medium leakage is greatly reduced, and the working life is further extended. Compared with various types of existing sealing devices, it has excellent pressure resistance, good sealing effect, small leakage and long life. It can be used in a variety of different types of equipment, equipment that originally used other types of sealing devices, and the sealing device of the present invention can be used as long as it is simply modified.

Claims

The invention provides a multiple n-type sealing device, which is characterized in that: the sealing device block and the n-type sealing ring; the sealing device block is provided with at least one sealing ring seating groove 4; the sealing device block is provided with a passage hole for communication The sealing ring is placed on the end surface of the groove and the sealing block; the n-shaped sealing ring is located in the sealing groove.

The multiple n-type sealing device according to claim 1, wherein a groove is provided on a working surface of the sealing device block.

The multiple n-type sealing device according to claim 1, wherein a passage hole communicates with the plurality of seal seating grooves or a passage hole communicates with a sealed seating groove.

The multiple n-type sealing device according to claim 1, wherein the n-shaped seal ring is a shaft structure or a hole structure.

The multiple n-type sealing device according to claim 1, wherein a sealing land is provided on the sealing working surface of the sealing ring.