CN221943253U - A sealing structure of a ball valve - Google Patents

Abstract

The utility model discloses a sealing structure of a ball valve, including an outer shell, a rotating shaft, a sealing rubber ring, a friction sleeve and a fixed groove. The center of the outer shell is a vertically penetrating cavity; the rotating shaft penetrates the cavity; the fixed groove is an annular groove opened around the middle of the side wall of the rotating shaft; the sealing rubber ring is fixed to the fixed groove; the friction sleeve is installed in the cavity and sleeved with the outer side of the rotating shaft, the friction sleeve abuts against the sealing rubber ring, and the contact surface between the friction sleeve and the sealing rubber ring is made of polytetrafluoroethylene material. The sealing rubber ring and the friction sleeve are abutted and sealed, and the friction surface is rubber in contact with polytetrafluoroethylene. The self-lubricating property of polytetrafluoroethylene is used to reduce the wear generated during the rotation process while ensuring the sealing performance. By setting the fixed groove, the outer diameter of the rotating shaft is reduced under the premise of ensuring the versatility of the outer shell, and space is reserved for the installation of the friction sleeve, thereby improving the versatility.

Description

A sealing structure of a ball valve

Technical Field

The utility model relates to a sealing structure of a rotary valve body, in particular to a sealing structure of a ball valve.

Background Art

There are two main types of ball valve sealing: soft sealing and hard sealing. Hard sealing refers to a sealing method in which both sides of the sealing pair are made of metal materials, which has good wear resistance. The sealing principle of hard sealing is to use the contact pressure and friction between the metal ball and the metal valve seat to achieve sealing. Therefore, it is necessary to ensure the surface accuracy and fit of the ball and the valve seat. The structure is complex, the processing accuracy requirements are high, and the cost is high. Therefore, soft-sealed ball valves are often used. Soft sealing refers to a sealing method in which one side of the sealing pair is made of metal material and the other side is made of elastic non-metallic material. This type of sealing has better sealing performance, but the friction between metal and non-metal can easily cause non-metallic materials to wear, resulting in reduced sealing performance and reduced structural service life.

Utility Model Content

The purpose of the utility model is to provide a sealing structure of a ball valve to solve the problems raised in the above background technology.

In order to achieve the above purpose, the utility model provides the following technical solutions:

A sealing structure of a ball valve comprises an outer shell and a rotating shaft, wherein the center of the outer shell is a vertically penetrating cavity; the rotating shaft penetrates the cavity; the special feature of the structure is that it also comprises a sealing rubber ring, a friction sleeve and a fixing groove.

The fixing groove is an annular groove formed around the middle of the side wall of the rotating shaft;

The sealing rubber ring is fixed in the fixing groove;

The friction sleeve is installed in the cavity and sleeved on the outer side of the rotating shaft. The friction sleeve abuts against the sealing rubber ring. The contact surface between the friction sleeve and the sealing rubber ring is made of high molecular polymer material.

As a further preference, the friction sleeve is made of polytetrafluoroethylene material or coated with a polytetrafluoroethylene coating, so as to reduce the wear during the rotation process by the self-lubricating property of polytetrafluoroethylene.

As a further preference, the sealing rubber ring is clearance-matched with the upper surface of the lower side of the fixing groove to increase the cross-sectional area of the pressure-bearing surface, reduce the liquid pressure at the joint, and improve the sealing performance of the device.

As a further preference, a fixed thread is provided on the inner side of the cavity; a clamping thread sleeve is sleeved on the upper part of the rotating shaft, and the outer side of the clamping thread sleeve is threadedly connected to the fixed thread; the clamping thread sleeve abuts against the upper side of the friction sleeve; a rubber gasket is provided at the lower part of the friction sleeve; a limiting inner ring for supporting the rubber gasket is provided at the center of the outer shell.

It can be seen that the compression threaded sleeve is used to fix the friction sleeve, and the rubber gasket is squeezed by pressing the compression threaded sleeve downward to improve the sealing performance.

As a further preference, a sealing seat is provided at the lower portion of the rotating shaft; a sealing ring is provided between the sealing seat and the limiting inner ring to improve the sealing performance.

As a further preferred embodiment, a rotating protrusion is provided at the lower end of the rotating shaft; a spherical valve core is connected to the lower end of the rotating shaft, a horizontal through opening is provided in the middle thereof, a rotating groove is provided at the top end of the spherical valve core, the rotating protrusion is inserted into the rotating groove, and the rotating protrusion is key-connected with the rotating groove to drive the spherical valve core to rotate, thereby rotating to change the direction of the through opening and controlling the opening and closing of the ball valve.

Compared with the prior art, the beneficial effects of the utility model are: 1. Abutment sealing is performed by the sealing rubber ring and the friction sleeve, and the friction surface is the contact between rubber and high molecular polymer material, which reduces the wear of the sealing rubber ring during rotation while ensuring the sealing performance; and improves the service life of the sealing rubber ring; 2. By setting a fixing groove, the outer diameter of the rotating shaft is reduced while ensuring the versatility of the outer shell, and space is reserved for the installation of the friction sleeve, which prevents the outer shell structure from changing and improves versatility.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art.

FIG. 1 is a schematic structural diagram of the sealing structure of the ball valve of this embodiment.

FIG. 2 is a three-dimensional assembly diagram of the sealing structure of the ball valve of this embodiment.

FIG. 3 is a three-dimensional view of the spherical valve core in the sealing structure of the ball valve of this embodiment.

FIG. 4 is a three-dimensional view of the rotating shaft in the sealing structure of the ball valve of this embodiment.

In the figure: rotating shaft -1, outer shell -2, tightening thread sleeve -3, sealing rubber ring -4, friction sleeve -5, rubber gasket -6, sealing ring -7, spherical valve core -8, rotating protrusion -101, fixed groove -102, sealing seat -103, limiting inner ring -201, fixed thread -202, rotating groove -801, through port -802.

DETAILED DESCRIPTION

In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

Please refer to FIG. 1 and FIG. 4 , the sealing structure of a ball valve according to the embodiment of the utility model includes an outer shell 2, a rotating shaft 1, a spherical valve core 8, a sealing rubber ring 4, a friction sleeve 5 and a fixing groove 102;

The center of the outer shell 2 is a vertically penetrating cavity; the rotating shaft 1 passes through the cavity; the spherical valve core 8 is located at the bottom end of the rotating shaft 1; the fixed groove 102 is an annular groove opened around the middle of the side wall of the rotating shaft 1; the sealing rubber ring 4 is fixed to the fixed groove 102; the friction sleeve 5 is installed in the cavity and sleeved on the outside of the rotating shaft 1, the friction sleeve 5 is in contact with the sealing rubber ring 4, the friction sleeve 5 is made of polytetrafluoroethylene material, and the sealing rubber ring 4 is made of rubber material, and the self-lubricating property of polytetrafluoroethylene is used to reduce the wear of the sealing rubber ring 4 during rotation.

As shown in FIG. 1 , in the embodiment of the utility model, the sealing rubber ring 4 is gap-matched with the lower upper surface of the fixing groove 102 to increase the cross-sectional area of the pressure-bearing surface, reduce the liquid pressure at the joint, and improve the sealing performance of the device.

As shown in Figures 1 and 4, in the embodiment of the utility model, a fixed thread 202 is provided on the inner side of the cavity; a clamping thread sleeve 3 is sleeved on the upper part of the rotating shaft 1, and the outer side of the clamping thread sleeve is threadedly connected to the fixed thread 202; the clamping thread sleeve abuts against the upper side of the friction sleeve 5; a rubber gasket 6 is provided at the lower part of the friction sleeve 5; and a limiting inner ring 201 for supporting the rubber gasket 6 is provided at the center of the outer shell 2.

During the working process of the utility model, the friction sleeve 5 is pressed down by rotating the compression threaded sleeve 3, and the rubber gasket 6 is squeezed at the same time, so as to improve the sealing performance.

As shown in FIG. 1 , in the embodiment of the utility model, a sealing seat 103 is provided at the lower part of the rotating shaft 1 ; a sealing ring 7 is provided between the sealing seat 103 and the limiting inner ring 201 to improve the sealing performance.

As shown in Figures 2 and 3, in the embodiment of the utility model, a rotating protrusion 101 is provided at the lower end of the rotating shaft 1; a spherical valve core 8 is connected to the lower end of the rotating shaft, a horizontal through-port 802 is provided in the middle thereof, a rotating groove 801 is provided at the top of the spherical valve core 8, the rotating protrusion 101 is inserted into the rotating groove 801, and the rotating protrusion 101 is key-connected with the rotating groove 801, so as to drive the spherical valve core 8 to rotate, thereby changing the direction of the through-port 802 and controlling the opening and closing of the ball valve.

The assembly process of the utility model is as follows: 1. The sealing ring 7 is placed close to the bottom of the cavity of the outer shell 2, at the lower side of the limiting inner ring 201; 2. The sealing rubber ring 4 is fixed at the fixing groove 102; 3. The rotating shaft 1 is inserted from the lower side of the outer shell 2; 4. Above the limiting inner ring 201, the rubber gasket 6, the friction sleeve 5 and the pressing thread sleeve 3 are sequentially sleeved on the rotating shaft 1 from bottom to top; 5. The pressing thread sleeve 3 is rotated to complete the fixing of the friction sleeve 5 and the rubber gasket 6; 6. The rotating protrusion 101 is aligned and inserted into the rotating groove 801 of the spherical valve core 8, and the outer shell 2 is fixed to the installation position of the spherical valve core 8 to complete the installation of the spherical valve core 8 and its sealing structure.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims (5)

1. The sealing structure of the ball valve comprises an outer shell and a rotating shaft, wherein the center of the outer shell is a cavity vertically penetrating through the outer shell; the rotating shaft penetrates through the cavity; the method is characterized in that: also comprises a sealing rubber ring, a friction sleeve and a fixing groove,

The fixed groove is a ring groove formed around the middle part of the side wall of the rotating shaft;

the sealing rubber ring is fixed in the fixing groove;

The friction sleeve is arranged in the cavity and sleeved on the outer side of the rotating shaft, the friction sleeve is in butt joint with the sealing rubber ring, and the contact surface of the friction sleeve and the sealing rubber ring is made of high-molecular polymer materials.

2. The sealing structure of the ball valve according to claim 1, wherein: the friction sleeve is made of polytetrafluoroethylene materials or is coated with polytetrafluoroethylene material coating on the surface.

3. The sealing structure of the ball valve according to claim 1, wherein: and the sealing rubber ring is in clearance fit with the lower surface of the fixed groove.

4. The sealing structure of the ball valve according to claim 1, wherein: the inner side of the cavity is provided with a fixed thread; the upper part of the rotating shaft is sleeved with a compression thread sleeve, and the outer side of the compression thread sleeve is in threaded connection with the fixed thread; the compression thread sleeve is abutted against the upper side of the friction sleeve; the lower part of the friction sleeve is provided with a rubber gasket; and the center of the outer shell is provided with a limiting inner ring for supporting the rubber gasket.

5. The sealing structure of the ball valve according to claim 4, wherein: the lower part of the rotating shaft is provided with a sealing seat; and a sealing ring is arranged between the sealing seat and the limiting inner ring.