Composite sealing valve seat with elastic automatic compensation function

Abstract

The utility model relates to a composite sealing valve seat with an elastic automatic compensation function. The composite sealing valve seat comprises a base, a sealing seat and a sealing ring, the sealing device is characterized in that the sealing ring has an inverted trapezoidal section structure and is mounted on a cylindrical surface between a first step and a second step on the outer circular surface of the base; an elastic compensation device composed of a cylindrical spring and a pressing ring is arranged in a second spring cavity on the left side of the sealing ring, when the sealing ring is abraded in the frequent moving process, the cylindrical spring pushes the pressing ring, the inclined face of the pressing ring is made to tightly wedge the sealing ring, the sealing ring is expanded in the radial direction, and abrasion of the outer circle face of the sealing ring is automatically compensated. Reliable sealing between the valve seat and the valve body channel is achieved, and the sealing performance between the valve seat and the valve body is improved.

Description

Technical Field

[0001] This utility model relates to a valve sealing device, and more particularly to a valve seat for a ball valve. Background Technology

[0002] The valve seat of a ball valve is installed inside the valve body passage and cooperates with the ball to form a sealing pair. To prevent the valve seat and ball from jamming due to temperature changes, the valve seat of a ball valve is generally a floating valve seat. That is, a spring is set between the back of the valve seat and the radial step of the valve body passage. The spring force presses the valve seat and the ball into tight contact, which can absorb the expansion caused by temperature changes. A sealing ring is generally set between the outer surface of the valve seat and the inner wall of the valve body passage to achieve a seal between the valve seat and the valve body passage. Its main disadvantage is that during operation, the valve seat moves frequently in the valve body passage, which causes repeated friction between the outer surface of the sealing ring and the inner wall of the valve body passage, resulting in wear of the outer surface of the sealing ring and leakage between the valve seat and the valve body passage. Utility Model Content

[0003] This invention addresses the shortcomings of existing technologies by providing a composite sealing valve seat with an elastic automatic compensation function that can elastically compensate for wear on the outer surface of the sealing ring and improve the sealing performance between the valve seat and the valve body channel.

[0004] The technical solution of this utility model is as follows:

[0005] A composite sealing valve seat with elastic automatic compensation function includes a base, a sealing seat, and a sealing ring. The base is integrally embedded in the valve body channel. The sealing seat is embedded at one end of the base and cooperates with a ball installed in the valve cavity to form a sealing pair. A spring is installed in a spring cavity between the other end of the base and the valve body. A sealing ring is installed between the outer circumference of the base and the inner wall of the valve body channel. The sealing ring is characterized by having an inverted trapezoidal cross-section structure and being installed on a cylindrical surface between a first step and a second step on the outer circumference of the base. The first step has an inclined surface that cooperates with the trapezoidal surface on the right side of the sealing ring, thus providing a sealing effect. An elastic compensation device is provided between the trapezoidal surface on the left side of the ring and the radial step in the valve body channel; the elastic compensation device consists of a pressure ring and a cylindrical spring, which is installed in the second spring cavity between the radial step and the second step. The right side of the pressure ring is a cylindrical structure, and the inner wall of the cylinder is movably embedded in the cylindrical surface between the first step and the second step on the outer circular surface of the base. The outer circular surface is in clearance fit with the inner wall of the valve body channel. The right end face of the cylinder has an inclined surface that cooperates with the trapezoidal surface on the other side of the sealing ring. The cylindrical springs are evenly installed in the second spring cavity between the left end face of the pressure ring and the radial step of the valve body.

[0006] In the above technical solution, a flushing device is provided on the base. The flushing device is composed of an annular flow channel set on the base inside the sealing seat. A flushing valve is installed on the valve body at one end of the annular flow channel. Sealing rings are respectively set between the base and the inner wall of the valve body channel on both sides of the annular flow channel.

[0007] In the above technical solution, the sealing seat adopts a rubber sealing ring, and a metal spherical sealing surface that cooperates with the spherical surface of the sphere is provided on the base outside the rubber sealing ring, forming a double sealing structure.

[0008] The beneficial effects of this utility model compared with the prior art are as follows: An elastic compensation device consisting of a cylindrical spring and a pressure ring is set in the second spring cavity on the left side of the sealing ring. When the sealing ring wears during frequent movement, the cylindrical spring pushes the pressure ring, causing the inclined surface of the pressure ring to wed the sealing ring tightly, thus expanding the sealing ring radially and automatically compensating for the wear of the outer circular surface of the sealing ring. This achieves a reliable seal between the base and the valve body channel, effectively improving the sealing performance between the valve seat and the valve body. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the structure of this utility model.

[0010] In the figure: 1 base, 2 sealing seat, 3 pressure ring, 4 sealing ring, 5 sealing ring, 6 cylindrical spring, 7 second spring cavity, 8 valve body, 9 spring, 10 spring cavity, 11 annular flow channel, 12 first step, 13 second step, 14 radial step, 15 metal spherical sealing surface. Detailed Implementation

[0011] like Figure 1The composite sealing valve seat with elastic automatic compensation function shown includes a base 1, a sealing seat 2, and a sealing ring 5. The base 1 is integrally embedded in the valve body 8 channel. The sealing seat 2 is embedded at the right end of the base 1 and cooperates with a ball installed in the valve cavity to form a sealing pair. A spring 9 is installed in the spring cavity 10 between the left end face of the base 1 and the valve body 8. The sealing ring 5 is installed between the outer circumference of the base 1 and the inner wall of the valve body 8 channel, forming a floating valve seat structure to prevent the base 1 and the ball from jamming due to high temperature expansion. Its features are: the sealing ring 5 has an inverted trapezoidal cross-section structure and is installed on the outer circular surface between the first step 12 and the second step 13 of the base 1 to achieve a seal between the valve seat and the valve body 8; the first step 12 has an inclined surface that cooperates with the right trapezoidal surface of the sealing ring 5, and the left trapezoidal surface of the sealing ring 5 has a radial platform in the valve body 8 channel. An elastic compensation device is provided between the steps 14. The elastic compensation device consists of a pressure ring 3 and a cylindrical spring 6, which is installed in the second spring cavity 7 between the radial step 14 of the valve body 8 and the second step 13 of the base 1. The right side of the pressure ring 3 is a cylindrical structure. The inner wall of the cylinder is movably embedded in the cylindrical surface between the first step 12 and the second step 13 of the base 1. The outer circular surface is in clearance fit with the inner wall of the valve body 8 channel. The right end face of the cylinder has an inclined surface that matches the trapezoidal surface on the left side of the sealing ring 5. The cylindrical spring 6 is evenly installed in the second spring cavity 7 between the left end face of the pressure ring 3 and the radial step 14 of the valve body 8. The elastic force of the cylindrical spring 6 pushes the pressure ring 3 to wedge the sealing ring 5 and radially press and seal it against the inner wall of the valve body 8 channel, automatically compensating for the wear caused by the movement of the sealing ring 5. The sealing ring 5 is made of rubber material to increase its elasticity and extensibility.

[0012] A flushing device is provided on the base 1. The flushing device consists of an annular flow channel 11 set on the base inside the sealing seat 2. The annular flow channel 11 is connected to the flushing valve installed on the valve body 8. Opening the flushing valve can flush the valve cavity and the ball, reducing the wear of particulate impurities on the sealing surface. Sealing rings 4 are respectively set between the base 1 on both sides of the annular flow channel 11 and the inner wall of the valve body 8 channel.

[0013] The sealing seat 2 adopts a rubber sealing ring, and a metal spherical sealing surface 15 that cooperates with the spherical surface of the ball is provided on the base 1 outside the rubber sealing ring, forming a double sealing structure. When the rubber sealing ring fails, the metal spherical sealing surface 15 cooperates with the ball to form a sealing pair.

[0014] In this utility model, directional terms such as "left" and "right" refer to the positions in the diagram for ease of description and should not be construed as limiting the scope of this utility model.

Claims

1. A composite sealing valve seat with elastic automatic compensation function, comprising a base (1), a sealing seat (2), and a sealing ring (5), wherein the base (1) is embedded in the channel of a valve body (8), the sealing seat (2) is embedded at the right end of the base (1) and cooperates with a ball installed in the valve cavity to form a sealing pair, a spring (9) is provided in the spring cavity (10) between the left end face of the base (1) and the valve body (8), and a sealing ring (5) is provided between the outer circumference of the base (1) and the inner wall of the channel of the valve body (8); characterized in that: The sealing ring (5) has an inverted trapezoidal cross-section structure and is installed on the outer circular surface between the first step (12) and the second step (13) of the base (1). The first step (12) has an inclined surface that cooperates with the trapezoidal surface on the right side of the sealing ring (5). An elastic compensation device is provided between the trapezoidal surface on the left side of the sealing ring (5) and the radial step (14) in the channel of the valve body (8). The elastic compensation device consists of a pressure ring (3) and a cylindrical spring (6) and is installed between the radial step (14) of the valve body (8) and the base (1). The second spring cavity (7) between the second step (13) has a cylindrical structure on the right side of the pressure ring (3). The inner wall of the cylinder is movably embedded on the cylindrical surface between the first step (12) and the second step (13) of the base (1). The outer circular surface is in clearance fit with the inner wall of the valve body (8) channel. The right end face of the cylinder has an inclined surface that matches the trapezoidal surface on the left side of the sealing ring (5). The cylindrical spring (6) is evenly installed in the second spring cavity (7) between the left end face of the pressure ring (3) and the radial step (14) of the valve body (8).

2. The composite sealing valve seat with elastic automatic compensation function according to claim 1, characterized in that: A flushing device is provided on the base (1). The flushing device is composed of an annular flow channel (11) set on the base inside the sealing seat (2). The annular flow channel (11) is connected to the flushing valve installed on the valve body (8). Sealing rings (4) are respectively set between the base (1) and the inner wall of the valve body (8) on both sides of the annular flow channel (11).

3. The composite sealing valve seat with elastic automatic compensation function according to claim 1 or 2, characterized in that: The sealing seat (2) adopts a rubber sealing ring, and a metal spherical sealing surface (15) that cooperates with the spherical surface of the ball is set on the base (1) outside the rubber sealing ring to form a double sealing structure.

Images