Sealing mechanism of ultralow-temperature ball valve

Abstract

The utility model relates to the technical field of sealing mechanisms of ball valves, in particular to a sealing mechanism of an ultralow-temperature ball valve, which comprises a ball valve main body used for controlling opening, closing and adjustment of fluid, the ball valve main body comprises a valve body, sealing assemblies and a valve cover, the sealing assemblies are arranged on the left side and the right side of the valve body, and each sealing assembly comprises a sealing ring and a sealing valve seat. Sealing valve seats are arranged in the left side and the right side of the valve body, a plurality of sealing rings are tightly attached to the left side and the right side of each sealing valve seat, a valve cover is connected to the outer side of the valve body through bolts, and an installation assembly is arranged on one side of each sealing ring and comprises a positioning block, a clamping block and a second elastic block. One side of a part of the sealing ring is fixedly connected with a positioning block which is elastically arranged, two sides of the positioning block are fixedly connected with clamping blocks which are elastically arranged, and the sealing ring is convenient to replace and install as a whole through the detachable installation assembly arranged on the sealing ring.

Description

Technical Field

[0001] The utility model relates to the technical field of sealing mechanisms of ball valves, in particular to a sealing mechanism of a cryogenic ball valve. Background Art

[0002] Ultra-low temperature ball valves are ball valves with a design temperature below -101°C. They are mainly used in equipment in the liquefied natural gas (LNG), liquefied petroleum gas, and air separation industries. These media are not only flammable and explosive, but also vaporize when heated or flash evaporates, causing their volume to expand rapidly. The ball valve has a sealing structure composed of several sealing rings. Its main purpose is to prevent medium leakage and ensure the normal operation and safety of the system.

[0003] In order to facilitate the rotation of the valve, the sealing structures on both sides of the ball valve are set to be retractable and elastic. After long-term use, the elastic force of the sealing ring of the sealing structure decreases, resulting in a decrease in the sealing effect. At this time, the sealing ring needs to be replaced. During the replacement process, they need to be removed and installed one by one, which is a cumbersome process. Therefore, a sealing mechanism of an ultra-low temperature ball valve is proposed to address the above problems. Summary of the Invention

[0004] The purpose of the utility model is to provide a sealing mechanism for a cryogenic ball valve, so as to solve the problem of the cumbersome process of disassembling a plurality of sealing rings one by one.

[0005] To achieve the above objectives, the present invention provides the following technical solutions:

[0006] A sealing mechanism of an ultra-low temperature ball valve comprises a ball valve body for controlling the switching and regulation of a fluid, the ball valve body comprising a valve body, a sealing assembly and a valve cover, sealing assemblies are provided on the left and right sides of the valve body, the sealing assembly comprises a sealing ring and a sealing valve seat, sealing valve seats are provided on the left and right sides of the valve body, and a plurality of sealing rings are tightly fitted on the left and right sides of the sealing valve seat, the valve cover is bolted to the outside of the valve body, a mounting assembly is provided on one side of the sealing ring, the mounting assembly comprises a positioning block, a clamping block and a second elastic block, one side of one portion of the sealing ring is fixedly connected to an elastically arranged positioning block, and both sides of the positioning block are fixedly connected to an elastically arranged clamping block, and limiting grooves are provided in some of the sealing rings.

[0007] Preferably, a first groove is formed in each of the sealing rings, and a first elastic block is tightly fitted in the first groove.

[0008] Preferably, a second groove is provided in the positioning block, and a second elastic block is provided in the second groove.

[0009] Preferably, both sides of the cross-section of the limiting groove are provided with arc-shaped protrusions, and the limiting groove and the positioning block fit tightly.

[0010] Preferably, the clamping block is hemispherical, and the arc-shaped protrusion of the limiting groove fits tightly with the clamping block.

[0011] Compared with the prior art, the beneficial effects of the present invention are:

[0012] In the utility model, through the provision of the ball valve body, valve body, sealing assembly, sealing ring, sealing valve seat, valve cover, installation assembly, positioning block, clamping block and limiting groove, the sealing ring is inserted into the limiting groove opened by the other sealing ring through the positioning block on one side, and the elastically provided clamping block is tightly fitted with the limiting groove, thereby simply fixing the two sealing rings, and simply fixing the remaining sealing rings fitted together in the same way, so that they can be operated as a whole during disassembly and installation, avoiding the tedious process of installing and disassembling one by one. By providing the first elastic block and the first groove in the sealing ring, the overall elasticity of the sealing ring is increased, thereby making its sealing effect better. At the same time, the ball valve body facilitates the expansion and contraction of the sealing structure when closing and opening. By providing the second elastic block and the second groove, the clamping block can be tightly fitted with the arc-shaped protrusion of the limiting groove under the action of the second elastic block. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the overall structure of the utility model;

[0014] Figure 2 This is a schematic diagram of the cross-sectional structure of the sealing ring of the utility model;

[0015] Figure 3 For this utility model Figure 2 Schematic diagram of the structure at A;

[0016] Figure 4 For this utility model Figure 2 Schematic diagram of the structure at B;

[0017] Figure 5 This is a schematic diagram of the cross-sectional structure of the positioning block of the utility model.

[0018] In the figure: 1. Ball valve body; 11. Valve body; 12. Sealing assembly; 121. Sealing ring; 122. Sealing valve seat; 13. Valve cover; 2. First elastic block; 3. First groove; 4. Mounting assembly; 41. Positioning block; 42. Clamping block; 43. Second elastic block; 5. Second groove; 6. Limiting groove. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0020] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0021] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0022] See also Figure 1-5 , the utility model provides a technical solution:

[0023] A sealing mechanism of an ultra-low temperature ball valve includes a ball valve body 1 for controlling the switching and regulation of a fluid, the ball valve body 1 includes a valve body 11, a sealing assembly 12 and a valve cover 13, a sealing assembly 12 is provided on the left and right sides of the valve body 11, the sealing assembly 12 includes a sealing ring 121 and a sealing valve seat 122, a sealing valve seat 122 is provided in the left and right sides of the valve body 11, and a plurality of sealing rings 121 are tightly fitted on the left and right sides of the sealing valve seat 122, the valve body 11 is bolted to the outside of the valve cover 13, and a mounting assembly 4 is provided on one side of the sealing ring 121, the mounting assembly 4 includes a positioning block 41, a clamping block 42 and a second elastic block 43, one side of a partial sealing ring 121 is fixedly connected to an elastically arranged positioning block 41, and both sides of the positioning block 41 are fixedly connected to elastically arranged clamping blocks 42, a limiting groove 6 is provided in a partial sealing ring 121, and the detachable mounting assembly 4 provided on the sealing ring 121 facilitates the replacement and installation of the sealing ring 121 as a whole.

[0024] A first groove 3 is provided in each sealing ring 121, and a first elastic block 2 is tightly fitted in the first groove 3, which increases the elastic deformation of the sealing ring 121; a second groove 5 is provided in the positioning block 41, and a second elastic block 43 is provided in the second groove 5, which increases the elastic deformation of the positioning block 41; the two sides of the cross-sectional shape of the limiting groove 6 are arranged with arc-shaped protrusions, and the limiting groove 6 and the positioning block 41 are tightly fitted, which facilitates the insertion of the positioning block 41; the clamping block 42 is arranged in a hemispherical shape, and the arc-shaped protrusion of the limiting groove 6 is tightly fitted with the clamping block 42, so that the positioning block 41 has a fixing effect after insertion.

[0025] Working process: When the sealing mechanism of the ultra-low temperature ball valve is in use, first install the ball valve body 1 in a suitable position. When it needs to be opened, twist the valve stem above the valve body 11 to drive the internal components to rotate, and the sealing ring 121 of the sealing component 12 undergoes elastic deformation. The first elastic block 2 and the first groove 3 inside the sealing ring 121 are used in conjunction with each other to increase the elastic deformation of the sealing ring 121. When the ball valve body 1 is used for a long time, the elastic force of the sealing ring 121 of the sealing component 12 decreases and affects the sealing effect, the sealing ring 121 needs to be replaced. After the user disassembles the valve cover 13, the user directly takes out several sealing rings 121 as a whole, and then splices several new sealing rings 121, that is, places the sealing ring 121 with the positioning block 41. On one side of the sealing ring 121 with the limiting groove 6, the positioning block 41 is inserted into the limiting groove 6. The elastic force of the second elastic block 43 in the positioning block 41 presses against the hemispherical block 42, so that it fits tightly with the arc-shaped protrusion of the limiting groove 6. The positioning block 41 inserted into the limiting groove 6 is simply fixed, and the remaining stacked sealing rings 121 are spliced ​​one by one in the same way. Then, the spliced ​​sealing rings 121 are put on the outside of the sealing valve seat 122, and the valve cover 13 is installed to complete the replacement of the sealing ring 121. When a single sealing ring 121 needs to be replaced, it is directly pulled out from one side. The detachable installation component 4 set for the sealing ring 121 facilitates the replacement and installation of the entire sealing ring 121.

[0026] Any matters not described in detail in this specification are prior art known to those skilled in the art. Standard parts used in this utility model are commercially available, and special-shaped parts can be customized according to the description in the specification and the accompanying drawings. The specific connection methods of each part are all conventional means such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts, and equipment are all conventional models in the prior art, and the circuit connections use conventional connection methods in the prior art, which will not be described in detail here.

[0027] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A sealing mechanism for a cryogenic ball valve, comprising a ball valve body (1) for controlling the switching and regulation of a fluid, characterized in that: The ball valve body (1) includes a valve body (11), a sealing assembly (12) and a valve cover (13). The valve body (11) is provided with sealing assemblies (12) on both sides. The sealing assembly (12) includes a sealing ring (121) and a sealing valve seat (122). The valve body (11) is provided with sealing valve seats (122) on both sides. The left and right sides of the sealing valve seat (122) are tightly fitted with a plurality of sealing rings (121). The valve cover (13) is bolted to the outside of the valve body (11). A mounting assembly (4) is provided on one side of the sealing ring (121). The mounting assembly (4) includes a positioning block (41), a clamping block (42) and a second elastic block (43). One side of some of the sealing rings (121) is fixedly connected to the elastically arranged positioning block (41). Both sides of the positioning block (41) are fixedly connected to the elastically arranged clamping blocks (42). A limiting groove (6) is provided in some of the sealing rings (121).

2. The sealing mechanism of a cryogenic ball valve according to claim 1, characterized in that: A first groove (3) is provided in each sealing ring (121), and a first elastic block (2) is tightly fitted in the first groove (3).

3. The sealing mechanism of a cryogenic ball valve according to claim 1, characterized in that: A second groove (5) is provided in the positioning block (41), and a second elastic block (43) is provided in the second groove (5).

4. The sealing mechanism of a cryogenic ball valve according to claim 1, characterized in that: The two sides of the cross-section of the limiting groove (6) are provided with arc-shaped protrusions, and the limiting groove (6) and the positioning block (41) are tightly fitted.

5. The sealing mechanism of a cryogenic ball valve according to claim 1, characterized in that: The clamping block (42) is hemispherical, and the arc-shaped protrusion of the limiting groove (6) is tightly fitted with the clamping block (42).

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