CN210637553U

CN210637553U - Direct-connected one-way check valve

Info

Publication number: CN210637553U
Application number: CN201920970047.9U
Authority: CN
Inventors: 杨仁成
Original assignee: Weipengsheng Shandong Machinery Co ltd
Current assignee: Weipengsheng Shandong Machinery Co ltd
Priority date: 2019-06-26
Filing date: 2019-06-26
Publication date: 2020-05-29
Anticipated expiration: 2029-06-26

Abstract

The utility model relates to a direct-connected one-way check valve, belonging to the technical field of one-way check valves, comprising a check valve and a corrugated pipe, wherein the inner diameter part of the upper end of the check valve is provided with a groove which is fixedly connected with the corrugated pipe, one end of the corrugated pipe is fixedly connected with the check valve, and the other end is provided with a flange; the straight edge section of the corrugated pipe is directly inserted into the groove for welding, so that the sealing performance of the corrugated pipe and the groove is ensured, and the problem of more leakage points caused by the existing check valve form is solved; the valve body is adjusted to be of a flange surface structure, and the sealing surface structure design of the sealing element is consistent with that of the flange sealing surface, so that the sealing width and the sealing performance of the gasket can be ensured. Adopt flange structure can solve because of the biggest excircle of check valve is inconsistent with flange bolt hole central circle size, and lead to installing inconvenient scheduling problem.

Description

Direct-connected one-way check valve

Technical Field

The utility model relates to an one-way check valve of direct-connected type for the use in the field can not be revealed to petrochemical pharmaceutical industry high-risk medium, it belongs to one-way check valve technical field.

Background

At present, because the environmental protection pressure is gradually increased, the distillation, volatilization, crystallization, tail gas recovery and the like of materials are realized by a dry screw vacuum pump in various petroleum and chemical pharmaceutical industries, and because the structural outlet pressure of the dry pump is lower, gas backflow is easily caused if equipment runs abnormally when chemical material reaction is carried out, the dry pump is generally matched with a check valve in the application of a vacuum system; in addition, because of the involvement of oil and gas, toxic and explosive media and the like, the requirement on sealing is higher, and a vacuum bellows is selected to be connected with a main pipeline in consideration of pipeline stress so as to reduce the possibility of poor sealing. The structure of the check valve for gas phase in the market is mostly referred to as the holding type check valve of WOOSUNG company. But the number of connecting points is increased, so that the possibility of gas leakage is increased greatly, for example, the arrangement of a single corrugated pipe is equivalent to the increase of one leakage point.

The existing check valve is of a clamping type (as shown in the following figure 4), flanges are not arranged on two sides of the existing check valve, and a certain deviation exists between the sizes of a sealing surface of the check valve and a sealing surface of the flange, so that the overlapping part of the sealing surface of the check valve and the sealing surface of the flange is narrow, and certain potential safety hazards exist. Meanwhile, because flanges are required to be used for clamping two sides of the gas pipe, the possibility of gas leakage is increased. Most of the check valve clacks are made of stainless steel, and are heavy in weight, the springs are required to have large elastic force, otherwise, the check valve clacks cannot have good check function on preventing backflow of gas, and if the elastic force of the springs is large, the vacuum degree of the gas cannot reach the ideal limit vacuum degree. If the check valve flap is made of the same material as the outer casting, poor corrosion resistance is caused. The maximum excircle of part check valve body is big for the bolt hole center circle of flange, can cause inconvenience for the installation of check valve.

SUMMERY OF THE UTILITY MODEL

The utility model discloses to the not enough of existence among the above-mentioned prior art, provide a one-way check valve of direct-connected type.

The utility model provides an above-mentioned technical problem's technical scheme as follows:

the utility model provides a one-way check valve of direct-connected type, includes check valve and bellows, and check valve upper end internal diameter department is equipped with the recess, recess and bellows fixed connection, is equipped with the flange on bellows one end and check valve fixed connection, the other end.

Further, the check valve includes the valve body, the valve body is flange face structure, and the valve body top is equipped with the sealing member unanimous with the flange face, the below is equipped with fixed connection's support base, be equipped with the spring between sealing member and the support base.

Furthermore, the sealing element is a PTFE plate, and the lower surface of the PTFE plate is provided with a slot matched with the spring.

Furthermore, a slot matched with the spring is arranged on the upper surface of the supporting base.

Further, the support base is retractable and loose.

Furthermore, the valve body is made of PTFE.

Further, the thickness of the pipeline of the welding part of the corrugated pipe is 1-3mm or adjusted according to the inner diameter of the groove.

Compared with the prior art, the beneficial effects of the utility model are that: the straight edge section of the corrugated pipe is directly inserted into the groove for welding, so that the sealing performance of the corrugated pipe and the groove is ensured, and the problem of more leakage points caused by the existing check valve form is solved; the valve body is adjusted to be of a flange surface structure, and the sealing surface structure design of the sealing element is consistent with that of the flange sealing surface, so that the sealing width and the sealing performance of the gasket can be ensured. Adopt flange structure can solve because of the biggest excircle of check valve is inconsistent with flange bolt hole central circle size, and lead to installing inconvenient scheduling problem.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a top view of the structure of the present invention.

Fig. 3 is a schematic view of a partial structure of the present invention.

Fig. 4 is a schematic view of a partial structure of the present invention.

In the figure, 1, check valve; 2. a bellows; 3. a flange; 4. a valve body; 5. a seal member; 6. a spring; 7. a groove; 8. and a base is supported.

Detailed Description

The principles and features of the present invention are described below in conjunction with the following drawings, the examples given are only intended to illustrate the present invention and are not intended to limit the scope of the present invention.

The utility model provides a one-way check valve of direct-connected type, includes check valve 1 and

bellows

2, and 1 upper end internal diameter department of check valve is equipped with recess 7,

recess

7 and 2 fixed connection of bellows, is equipped with flange 3 on 2 one ends of bellows and 1 fixed connection of check valve, the other end. The straight edge section of the corrugated pipe 2 is directly inserted into the groove 7 for welding, so that the sealing performance of the corrugated pipe 2 and the groove 7 is ensured, and the problem of more leakage points caused by the existing form of the check valve 1 is solved.

Check valve 1 includes valve body 4, valve body 4 is flange face structure, and 4 tops of valve body are equipped with the sealing member 5 unanimous with the flange face, the below is equipped with fixed connection's support base 8, be equipped with spring 6 between sealing member 5 and the support base 8. The valve body 4 is adjusted to be of a flange surface structure, and the sealing surface structure design of the sealing element 5 is consistent with that of the flange sealing surface, so that the sealing width and the sealing performance of the gasket can be ensured. Adopt flange structure can solve because of the biggest excircle of check valve 1 is inconsistent with flange bolt hole central circle size, and lead to installing inconvenient scheduling problem.

The sealing element 5 is a PTFE plate, and the lower surface of the PTFE plate is provided with a slot matched with the spring 6. This construction ensures that the spring 6 can be effectively fixed against displacement in the longitudinal direction. At the same time, the spring 6 is not required to have larger elastic force to cause the flap of the check valve 1 to restore the original position. If the vacuum system runs, the one-way valve can be opened only by overcoming the gravity of the sealing element 5 due to the design of the spring 6, one side of gas in the pipeline can move, if the equipment runs and fails, the sealing element 5 is directly jacked to a sealing position by the spring 6, and the sealing performance of the sealing element can be ensured because the size of the contact surface of the sealing outline and the sealing element 5 is consistent.

And the upper surface of the supporting base 8 is provided with a slot matched with the spring 6.

The support base 8 is retractable and loose.

The valve body 4 is made of PTFE. The corrosion resistance of the valve body 4 is ensured.

The thickness of the pipeline of the welding part of the corrugated pipe 2 is 1-3mm or adjusted according to the inner diameter of the groove 7. If the welding deformation occurs, the sealing performance of the overflowing system can be realized by adjusting the position of the flange due to larger deformable quantity.

The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.

Claims

1. A one-way check valve of direct-connected type, includes check valve (1) and bellows (2), its characterized in that: the inner diameter of the upper end of the check valve (1) is provided with a groove (7), the groove (7) is fixedly connected with the corrugated pipe (2), one end of the corrugated pipe (2) is fixedly connected with the check valve (1), and the other end of the corrugated pipe is provided with a flange (3).

2. The direct connect one-way check valve of claim 1, wherein: check valve (1) includes valve body (4), valve body (4) are flange face structure, and valve body (4) top is equipped with sealing member (5) unanimous with the flange face, is equipped with fixed connection's support base (8) below, be equipped with spring (6) between sealing member (5) and support base (8).

3. The direct connect one-way check valve of claim 2, wherein: the sealing element (5) is a PTFE plate, and the lower surface of the PTFE plate is provided with a groove matched with the spring (6).

4. The direct connect one-way check valve of claim 2, wherein: and the upper surface of the supporting base (8) is provided with a slot matched with the spring (6).

5. The direct connect one-way check valve of claim 2, wherein: the supporting base (8) is retractable and loose.

6. The direct connect one-way check valve of claim 2, wherein: the valve body (4) is made of PTFE.

7. The direct connect one-way check valve of claim 1, wherein: the thickness of the pipeline of the welding part of the corrugated pipe (2) is 1-3mm or adjusted according to the inner diameter of the groove (7).