CN202165613U - O-ring dynamic sealing joint - Google Patents

Abstract

An O-ring dynamic sealing joint includes an air intake inner cylinder, a sleeve and a compression cap, and a static sealing O-ring is arranged between the air intake inner cylinder and the sleeve and between the sleeve and the compression cap. It also includes a dynamic sealing O-ring, which is provided with an annular step in the sleeve, and the dynamic sealing O-ring is embedded in the annular step and is sealed by a compression cap; The air inlet hole and the axial gas channel, the radial air inlet hole communicates with the axial gas channel; the axial gas channel is provided on the side wall of the sleeve, communicates with the axial gas channel on the side wall of the air inlet inner tube and is connected with the sleeve The annular steps in the barrel are connected. The O-ring dynamic sealing joint of the utility model can not only realize the sealing function, but also reduce and avoid wear and damage to the dynamic sealing O-ring during installation and disassembly of the sealed parts, and can prolong the service life of the O-ring.

Description

O-ring dynamic sealing joint

technical field

The utility model relates to a mechanical seal, in particular to an O-ring dynamic sealing joint.

Background technique

Due to the simple structure, high pressure resistance and small size of the O-ring, it has been widely used in various sealing occasions. The traditional O-ring seals rely on the prestress generated by the extrusion deformation during assembly to achieve the sealing effect. In many dynamic sealing environments, the wear of the O-ring directly affects its service life, especially when the sealed parts need to be installed and disassembled frequently, the process of installation and disassembly greatly increases the wear of the O-ring , Some even directly scratch the O-ring, which seriously affects the service life of the O-ring. Therefore, we need a new type of O-ring dynamic sealing joint, which can not only realize the sealing function, but also reduce and avoid the wear and damage of the O-ring during the installation and disassembly of the sealed parts, so as to prolong the use of the O-ring life.

Utility model content

The purpose of this utility model is to provide an O-ring dynamic sealing joint in order to solve the above-mentioned problems existing in the prior art.

In order to achieve the above purpose, the utility model adopts the following technical solutions: an O-ring dynamic sealing joint, including an air inlet inner cylinder, a sleeve and a compression cap, the sleeve is set on the upper part of the air intake inner cylinder, and the compression cap Connected to the upper part of the sleeve, a static sealing O-ring is provided between the air intake inner cylinder and the sleeve and between the sleeve and the compression cap; its characteristic is: it also includes a dynamic sealing O-ring, the said There is an annular step inside the sleeve, and the dynamic sealing O-ring is embedded in the annular step and is sealed by the compression cap; the side wall of the air inlet inner cylinder is provided with radial air inlet holes and axial gas outlets. channel, the radial air inlet hole communicates with the axial gas channel; the axial gas channel on the side wall of the sleeve communicates with the axial gas channel on the side wall of the air intake inner cylinder and communicates with the annular step in the sleeve connected.

The inner diameter of the dynamic sealing O-ring is greater than or equal to the outer diameter of the sealed part.

There are two axial gas passages on the side wall of the sleeve, and the two axial gas passages are symmetrically arranged and communicated with the annular steps respectively; an annular interlayer is provided between the air inlet inner cylinder and the sleeve , the annular interlayer communicates with the two axial gas passages on the side wall of the sleeve and communicates with the axial gas passage on the side wall of the intake inner cylinder.

Because the O-ring dynamic sealing joint of the utility model adopts the above technical scheme, when it is necessary to seal the sealed part, the clamping air with a certain pressure is introduced from the air intake hole of the air intake inner cylinder, and the clamping air is passed through the air intake hole. Apply pressure to the outside of the dynamic seal O-ring, because there is a pressure difference between the inside and outside of the dynamic seal O-ring, the dynamic seal O-ring shrinks and deforms, and clamps the sealed part to achieve the sealing effect. In this way, the sealing function can be realized, and the wear and damage of the dynamic sealing O-ring can be reduced and avoided by the installation and disassembly of the sealed parts, and the service life of the O-ring can be prolonged.

Description of drawings

Fig. 1 is the basic structural representation of O-ring dynamic seal joint of the present utility model;

Fig. 2 is a schematic diagram of the working state of the O-ring dynamic sealing joint of the utility model.

Detailed ways

The utility model will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

Refer to Fig. 1, and refer to Fig. 2 for cooperation. The O-ring dynamic sealing joint of the present invention includes an air intake inner cylinder 1, a sleeve 2 and a compression cap 3. The sleeve 2 is set on the upper part of the air intake inner cylinder 1, and the compression The tight cap 3 is connected to the upper part of the sleeve, and a static seal O-ring 4 and 5 is provided between the intake inner cylinder 1 and the sleeve 2, and a static seal O is provided between the sleeve 2 and the compression cap 3 Type ring 6. It also includes a dynamic sealing O-ring 7. An annular step 21 is provided in the sleeve 2. The dynamic sealing O-ring 7 is embedded in the annular step and is sealed by the compression cap 3; The wall is provided with a radial air inlet hole 11 and an axial gas passage 12, and the radial air inlet hole 11 communicates with the axial gas passage 12; The axial gas channel 11 on the side wall communicates with and communicates with the annular step 21 in the sleeve 2 .

The inner diameter of the dynamic sealing O-ring 7 in the utility model is greater than or equal to the outer diameter of the sealed part.

The axial gas channel 22 on the side wall of the sleeve in the utility model can be set to two, and the two axial gas channels are symmetrically arranged and communicated with the annular step 21 respectively; There is an annular interlayer 14 therebetween, and the annular interlayer 14 communicates with the two axial gas passages 22 on the side wall of the sleeve and communicates with the axial gas passage 12 on the side wall of the air intake inner cylinder.

As shown in Figure 1, 9 is the installation hole of the sealed part, and 13 is the working gas channel.

Fig. 2 is a schematic diagram of the working state of the O-ring dynamic sealing joint of the utility model. When working, install the sealed part 8 into the installed hole 9 of the sealed part. After the installation is in place, the clamping gas enters the joint from the air inlet 11, and then passes through the axial gas passage 12 on the side wall of the inner cylinder, the annular interlayer 14. The axial gas channel 22 on the side wall of the sleeve enters the annular step 21 and reaches the outer side of the dynamic sealing O-ring 7. Due to the pressure difference between the inner and outer sides of the dynamic sealing O-ring 7, the dynamic sealing O-ring 7 shrinks and deforms. Clamp the sealed part 8 to achieve the sealing effect. After that, the working gas starts to enter from the working gas channel 13 .

It has been verified by practical application that the utility model can achieve a good sealing effect under the working condition that the clamping gas pressure is greater than or equal to the working gas pressure.

In order to match parts with different diameters and sizes, a dynamic sealing O-ring 7 of a corresponding size can be selected and the corresponding size of the joint can be modified to achieve a sealing effect.

The working principle, features and main advantages of the present utility model have been described above. Those skilled in the art should understand that the present utility model is not limited by the above-mentioned embodiments, such as: the working medium can also be liquid, etc., described in the above-mentioned examples and instructions The purpose is only to illustrate the principle of the utility model. Under the premise of not departing from the spirit and scope of the utility model, the utility model also has various changes and improvements, and these changes and improvements all fall within the scope of the claimed utility model.

Claims (3)

1. An O-ring dynamic sealing joint, including an air intake inner cylinder, a sleeve and a compression cap, the sleeve is set on the upper part of the air intake inner cylinder, the compression cap is connected to the upper part of the sleeve, and There is a static sealing O-ring between the sleeve and the sleeve and between the sleeve and the compression cap; it is characterized in that it also includes a dynamic sealing O-ring, and an annular step is provided in the sleeve, and the dynamic sealing O The type ring is embedded in the annular step and is sealed by the compression cap; the side wall of the air intake inner cylinder is provided with a radial air inlet hole and an axial gas channel, and the radial air inlet hole and the axial gas channel Communication; the sleeve side wall is provided with an axial gas passage which communicates with the axial gas passage on the side wall of the intake inner cylinder and communicates with the annular step in the sleeve. 2. The O-ring dynamic sealing joint according to claim 1, characterized in that: the inner diameter of the dynamic sealing O-ring is greater than or equal to the outer diameter of the sealed part. 3. The O-ring dynamic sealing joint according to claim 1, characterized in that: there are two axial gas passages on the side wall of the sleeve, and the two axial gas passages are symmetrically arranged and respectively connected to the The annular step communicates; an annular interlayer is provided between the air intake inner cylinder and the sleeve, and the annular interlayer communicates with the two axial gas passages on the side wall of the sleeve and is connected with the axial gas passage on the side wall of the air intake inner cylinder. The gas channel is connected.

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