CN218913805U

CN218913805U - Sealing structure of electric valve

Info

Publication number: CN218913805U
Application number: CN202221356636.6U
Authority: CN
Inventors: 张荣荣
Original assignee: Shanghai Pumason Industrial Control System Co ltd
Current assignee: Shanghai Pumason Industrial Control System Co ltd
Priority date: 2022-06-01
Filing date: 2022-06-01
Publication date: 2023-04-25
Anticipated expiration: 2032-06-01

Abstract

The utility model discloses an electric valve sealing structure, which comprises a valve body, a valve rod, an electric actuator and a spherical valve core arranged in the valve body, wherein an inlet and an outlet of a fluid medium are arranged on the valve body, the valve rod is respectively connected with the electric actuator and the spherical valve core, the valve rod is connected with the valve body through a valve rod seat, a sealing piece is arranged between the valve rod seat and the valve body, a supporting ring is arranged in the direction of the spherical valve core towards the inlet and the valve rod, one side of the supporting ring towards the spherical valve core is provided with an arc surface matched with the spherical valve core, the arc surface is provided with a first sealing seat and a second sealing seat, the first sealing seat is contacted with the spherical valve core to form a linear contact sealing line, the second sealing seat is contacted with the spherical valve core to form a contact surface seal, and a third sealing seat is arranged on the contact surface of the supporting ring and the valve body; the sealing area is reduced, friction is reduced, and the electric valve is easier to open and close; the multi-seal makes the tightness of the electric valve more reliable.

Description

Sealing structure of electric valve

Technical Field

The utility model relates to the technical field of electric valves, in particular to an electric valve sealing structure.

Background

The ball valve mainly has the functions of diversion, interception and flow direction change in the pipeline, and has wide application in the field of marine valves. Most of the existing ball valve sealing seats are of concave structures, and grooves of the existing ball valve sealing seats are integrally contacted with the ball body, so that sealing effect is achieved when the ball body rotates. Because the sealing seat is in surface contact with the ball body, the sealing of the ball valve is sometimes affected to a certain extent, and the sealing performance is reduced. When the valve rod drives the ball body to rotate, the torque is easy to increase due to compact sealing, and the ball body needs to be opened and closed with larger force, so that the ball body is not easy to open. The existing solution is to change the structural shape of the sealing seat, for example, chinese patent ZL201721233480.1 discloses a ball valve sealing structure and a ball valve, which adopt a convex sealing structure, so that the sealing form of the sealing seat and a ball body is changed from surface sealing to line sealing, and the contact area between the sealing seat and the ball body is reduced; however, the whole sealing seat is not changed greatly, the sealing seat has larger volume and is influenced by the material of the sealing seat, and the sealing performance between the sealing seat and the ball body is poor due to aging or corrosion of the sealing seat when the sealing seat is used for a long time; however, if the whole inner cavity of the valve body is processed into an arc surface to solve the problem of large volume of the needed sealing seat, the processing difficulty is relatively high, the processing precision is relatively low, and the processing production is not facilitated.

Disclosure of Invention

In view of the problem of insufficient sealing of the existing electric valve, the utility model provides an electric valve sealing structure which adopts multistage sealing to solve the problem of insufficient sealing performance.

In order to achieve the above purpose, the embodiment of the present utility model adopts the following technical scheme:

the utility model provides an electric valve seal structure, includes valve body, valve rod, electric actuator and sets up the interior spherical case of valve, be provided with the import and the export of fluid medium on the valve body, electric actuator and spherical case are connected respectively to the valve rod, be connected through the valve rod seat between valve rod and the valve body, be equipped with sealing member between valve rod seat and the valve body, be equipped with the holding ring in the direction of spherical case towards import and valve rod, one side of holding ring towards spherical case is equipped with the arcwall face with spherical case complex, be equipped with first sealing seat and second sealing seat on the arcwall face, first sealing seat with spherical case contact forms the linear contact seal line, the second sealing seat with spherical case contact forms the contact surface seal, be equipped with the third sealing seat on the face that holding ring contacted with the valve body.

According to one aspect of the utility model, the first sealing seat is a triangular ring sealing seat, the bottom end of the triangular ring sealing seat is arranged on the supporting ring, and the vertex angle end is abutted against the spherical valve core to realize first sealing between the supporting ring and the spherical valve core.

According to one aspect of the utility model, one end of the second sealing seat is arranged on the supporting ring, the end face of the other end is arc-shaped and is in arc fit with the outer wall of the spherical valve core, so that the other end of the second sealing seat is in fit and contact with the outer wall of the spherical valve core, and the second sealing between the supporting ring and the spherical valve core is realized.

According to one aspect of the utility model, the seal is a triangular gasket, the inner end of the valve stem seat is provided with a triangular groove, and the triangular gasket is arranged in the groove.

According to one aspect of the utility model, a nipple is connected to the outlet.

According to one aspect of the utility model, a sealing gasket is arranged between the connecting pipe and the valve body.

According to one aspect of the utility model, the valve rod seat is provided with a press cap, and the valve rod passes through the press cap.

According to one aspect of the utility model, the third sealing seat comprises a sealing groove and a sealing strip, wherein the sealing strip is arranged in the sealing groove and is abutted against the supporting ring, and the sealing groove is arranged on the valve body.

According to one aspect of the utility model, a sealing ring is arranged between the valve rod and the valve body.

According to one aspect of the utility model, a protective cover is arranged on the outer side of the pressure cap.

The implementation of the utility model has the advantages that: the supporting ring is arranged between the inner wall of the valve body and the spherical valve core, so that the gap between the spherical valve core and the inner wall of the valve body is reduced, the first sealing seat and the second sealing seat are arranged on the supporting ring, and the joint action of the linear sealing line and the arc sealing surface is used for sealing, so that the contact area between the two sealing seats is reduced, the sealing performance of the ball valve is improved, the sealing performance is good, the friction between the sealing seat and the valve core can be reduced due to the reduction of the sealing area, the switching torque is reduced, and the ball valve is easier to open and close; the two seals make the tightness of the ball valve more reliable. Further, the problem that sealing performance is invalid and cannot be used for a long time due to the fact that the sealing seat is easy to age and corrode is avoided by adopting a large-size sealing seat and two small-size sealing seats. Further, the setting of backup ring avoids carrying out the arcwall face processing to the valve body inner wall, increases the processing degree of difficulty, and ball valve processing is easy.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic view of a sealing structure of an electric valve according to the present utility model;

fig. 2 is an enlarged schematic view at a in fig. 1.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

As shown in fig. 1 and 2, an electric valve sealing structure comprises a valve body 1, a valve rod 2, an electric actuator 3 and a spherical valve core 4 arranged in the valve body, wherein an inlet 12 and an outlet 8 of fluid medium are arranged on the valve body, the valve rod 2 is respectively connected with the electric actuator 3 and the spherical valve core 4, the valve rod 2 is connected with the valve body 1 through a valve rod seat 5, a sealing piece 7 is arranged between the valve rod seat and the valve body, a supporting ring 13 is arranged in the direction of the spherical valve core 4 towards the inlet 12 and the valve rod 2, one side of the supporting ring 13 towards the spherical valve core is provided with an arc-shaped surface matched with the spherical valve core 4, a first sealing seat 41 and a second sealing seat 42 are arranged on the arc-shaped surface, the first sealing seat 41 is contacted with the spherical valve core 4 to form a linear contact sealing line, the bottom end of the triangular ring sealing seat is arranged on the supporting ring, and the top corner end is abutted against the spherical valve core to realize first sealing between the supporting ring and the spherical valve core; the second sealing seat 42 contacts with the spherical valve core to form a contact surface seal, a third sealing seat 14 is arranged on the contact surface of the supporting ring and the valve body, one end of the second sealing seat is arranged on the supporting ring, the end surface of the other end of the second sealing seat is arc-shaped and is in arc fit with the outer wall of the spherical valve core, and therefore the other end of the second sealing seat is in fit and abutting contact with the outer wall of the spherical valve core, and a second seal between the supporting ring and the spherical valve core is achieved.

In practical applications, the support ring 13 is made of a relatively hard anti-corrosion material, such as anti-corrosion rubber, or a material with a rigid support structure disposed in the rubber, which refers to a rubber used for a tire. Therefore, the sealing device can play a supporting role, and the problem of tightness degradation after long service time caused by the fact that a full sealing ring structure is arranged between the spherical valve core and the valve body is avoided. The flexible material of the full sealing ring structure is avoided, the rigidity is insufficient, and when the inlet pressure is high, the situation that the spherical valve core is extruded by strong pressure, so that the sealing ring is flattened and cannot be sealed easily occurs.

In practical application, the sealing element 7 is a triangular sealing gasket, a triangular groove is formed in the inner end of the valve rod seat, and the triangular sealing gasket is arranged in the groove.

In practical application, the outlet is connected with a connecting pipe 9.

In practical application, a sealing gasket 10 is arranged between the connecting pipe and the valve body.

In practical application, the valve rod seat is provided with a pressing cap 6, and the valve rod penetrates through the pressing cap.

In practical application, a sealing ring is arranged between the valve rod and the valve body.

In practical application, in order to enhance the tightness between the valve rod and the valve body, the sealing ring is arranged in a plurality of layers.

In practical application, the outside of the press cap is provided with a protective cover 11.

In practical application, the third sealing seat comprises a sealing groove and a sealing strip, wherein the sealing strip is arranged in the sealing groove and is abutted with the supporting ring, and the sealing groove is formed in the valve body; or the sealing groove is formed on the supporting ring, and the sealing strip is arranged in the sealing groove and is abutted against the inner wall of the valve body.

In practical application, the third sealing seats are multiple and are respectively arranged on the contact surfaces of the support ring and the valve body.

The foregoing is merely illustrative of the present utility model, and the present utility model is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the technical scope of the present utility model should be included in the scope of the present utility model. Therefore, the protection scope of the present utility model shall be subject to the protection scope of the claims.

Claims

1. The utility model provides an electric valve seal structure, includes valve body, valve rod, electric actuator and sets up the internal spherical case of valve, be provided with fluid medium's import and export on the valve body, electric actuator and spherical case are connected respectively to the valve rod, be connected through the valve rod seat between valve rod and the valve body, be equipped with the sealing member between valve rod seat and the valve body, its characterized in that is equipped with the holding ring in the direction of spherical case towards import and valve rod, one side of holding ring towards spherical case is equipped with the arcwall face with spherical case complex, be equipped with first sealing seat and second sealing seat on the arcwall face, first sealing seat with spherical case contact forms the linear contact seal line, the second sealing seat with spherical case contact forms the contact surface and seals, be equipped with the third sealing seat on the face that the holding ring contacted with the valve body.

2. The electrically operated valve sealing structure of claim 1, wherein the first sealing seat is a triangular ring sealing seat, the bottom end of the triangular ring sealing seat is arranged on the supporting ring, and the apex angle end is abutted against the spherical valve core to realize the first seal between the supporting ring and the spherical valve core.

3. The sealing structure of the electric valve according to claim 1, wherein one end of the second sealing seat is arranged on the supporting ring, the end face of the other end is arc-shaped and is in arc fit with the outer wall of the spherical valve core, so that the other end of the second sealing seat is in fit and contact with the outer wall of the spherical valve core, and a second seal between the supporting ring and the spherical valve core is achieved.

4. The electrically operated valve seal according to claim 1, wherein the seal is a triangular gasket, a triangular groove is provided in the inner end of the valve stem seat, and the triangular gasket is disposed in the groove.

5. The electrically operated valve seal according to claim 1, wherein a nipple is connected to the outlet.

6. The electrically operated valve sealing structure of claim 5, wherein a gasket is provided between said nipple and said valve body.

7. The electrically operated valve seal according to claim 1, wherein the valve stem seat is provided with a press cap, and the valve stem is disposed through the press cap.

8. The electrically operated valve seal structure according to any one of claims 1 to 7, wherein the third seal seat includes a seal groove and a seal strip, the seal strip being disposed in the seal groove and abutting against the support ring, the seal groove being provided on the valve body.

9. The electrically operated valve seal of claim 8, wherein a seal ring is disposed between the valve stem and the valve body.

10. The electrically operated valve sealing structure according to claim 7, wherein a protective cover is provided on an outer side of the press cap.