CN219013418U

CN219013418U - Low temperature resistant ball valve

Info

Publication number: CN219013418U
Application number: CN202223258844.5U
Authority: CN
Inventors: 吴杰都
Original assignee: Guangzhou Panuo Automation Equipment Co ltd
Current assignee: Guangzhou Panuo Automation Equipment Co ltd
Priority date: 2022-12-06
Filing date: 2022-12-06
Publication date: 2023-05-12
Anticipated expiration: 2032-12-06

Abstract

The application discloses a low temperature resistant ball valve, which relates to the technical field of ball valves and comprises a ball valve main body, a valve core, a fixed cover plate, a movable knob and a knob fixed block; the valve core is arranged in the ball valve main body, a knob butt joint hole is formed in the valve core, a knob mounting hole is formed in the ball valve main body, and the bottom end of the movable knob penetrates into the ball valve main body from the knob mounting hole and extends into the knob butt joint hole to be connected with the knob butt joint hole; the knob fixing block is sleeved on the movable knob and connected with the ball valve main body, so that the movable knob is arranged on the ball valve main body; the ball valve body and the valve core are respectively provided with an inlet and an outlet, and in an initial state, the inlet of the ball valve body is communicated with the inlet of the valve core, and the outlet of the ball valve body is communicated with the outlet of the valve core; the inlet and the outlet of the ball valve main body are respectively provided with a fixed cover plate, and one side of the fixed cover plate, which faces the ball valve main body, is provided with a first hydrogenated butyl cyanide sealing ring and a first polytetrafluoroethylene sealing ring in sequence. The ball valve can ensure the sealing performance of the ball valve under the extreme environment of high temperature and low temperature.

Description

Low temperature resistant ball valve

Technical Field

The application relates to the technical field of ball valves, in particular to a low-temperature-resistant ball valve.

Background

The ball valve switch is portable, small in size, capable of being made into a large caliber, reliable in sealing, simple in structure and convenient to maintain, and the sealing surface and the spherical surface are in a normally closed state and are not easy to be eroded by a medium, so that the ball valve switch is widely applied to various industries. The working principle of the manual ball valve is that the valve is unblocked or blocked by rotating the valve core, and the service temperature of the manual ball valve is limited by the valve seat sealing ring material because the manual ball valve usually uses rubber and nylon as the valve seat sealing ring material. Meanwhile, the stop function of the ball valve is completed by mutually pressing the metal ball bodies between the plastic valve seats under the action of the medium. Under the action of certain contact pressure, the valve seat sealing ring can generate elastic-plastic deformation in local areas, and the deformation can compensate the manufacturing precision and the surface roughness of the ball body, so that the sealing performance of the ball valve is ensured. The valve seat sealing ring of the manual ball valve is usually made of plastic, so that the heat resistance and cold resistance of the ball valve are considered in the aspect of selecting the structure and the performance of the manual ball valve, and particularly, the ball valve is used in the departments of petroleum, chemical industry, metallurgy and the like, such as equipment with inflammable and explosive mediums and severe weather pipeline systems, and attention is paid to fire resistance and cold resistance.

However, the ball valve structure in the prior art is generally poor in performance in a low-temperature environment, and is specifically poor in low-temperature (-41 ℃) resistance, the ball valve can be frozen and stiff and difficult to operate at low temperature, and the situation that the sealing ring in the ball valve cannot be elastically molded after frozen and stiff and can cause leakage occurs. Therefore, there is a need for a low temperature resistant ball valve with high sealing performance to solve this problem.

Disclosure of Invention

The purpose of the present application is to provide a low temperature resistant ball valve, so as to solve the existing prior art in the above background art.

In order to achieve the above purpose, the present application discloses the following technical solutions: a low temperature resistant ball valve comprises a ball valve main body, a valve core, a fixed cover plate, a movable knob and a knob fixed block;

the valve core is arranged in the ball valve main body, a knob butt joint hole is formed in the valve core, a knob mounting hole is formed in the ball valve main body, and the bottom end of the movable knob penetrates into the ball valve main body from the knob mounting hole and extends into the knob butt joint hole to be connected with the knob butt joint hole; the knob fixing block is sleeved on the upper part of the movable knob and is connected with the ball valve main body, so that the movable knob is arranged on the ball valve main body; the ball valve body and the valve core are respectively provided with an inlet and an outlet, and in an initial state, the inlet of the ball valve body is communicated with the inlet of the valve core, and the outlet of the ball valve body is communicated with the outlet of the valve core; the inlet and the outlet of the ball valve main body are respectively provided with a fixed cover plate, and one side of the fixed cover plate, which faces the ball valve main body, is provided with a first hydrogenated nitrile sealing ring and a first polytetrafluoroethylene sealing ring in sequence.

Preferably, the top end of the movable knob extends to the outside of the ball valve main body, the movable knob is exposed out of the ball valve main body, a limiting fixing plate is sleeved on the movable knob, a limiting screw is installed on the knob fixing block, a rotation limiting groove is formed in the limiting fixing plate, and the limiting screw and the rotation limiting groove cooperate to limit the rotation of the limiting fixing plate.

Preferably, the movable knob is provided with a plurality of sealing grooves, and the sealing grooves are embedded with a second hydrogenated nitrile sealing ring and a second polytetrafluoroethylene sealing ring.

Preferably, the fixed cover plate is embedded on the outer wall of the ball valve main body.

The beneficial effects are that: in order to guarantee the sealing performance of the ball valve under the extremely low temperature environment and high temperature, the low temperature resistant ball valve is sealed by adopting the sealing ring made of the hydrogenated butyl cyanide and the polytetrafluoroethylene, and the sealing ring made of the hydrogenated butyl cyanide material has the performance of high heat resistance of 150 ℃, cold resistance of-50 ℃ and deformation resistance, and the sealing ring made of the polytetrafluoroethylene has the performance of high heat resistance of 280 ℃, cold resistance of-100 ℃ and wear resistance, so that the ball valve structure can keep stable operation at low temperature (-41 ℃), and the problems that the freezing and stiff action is difficult and the sealing ring is frozen and hard to stretch-plastic are avoided. Meanwhile, the ball valve structure adopts the double-sealing design of the butyl cyanide sealing ring and the polytetrafluoroethylene sealing ring, combines the characteristic that the soft sealing structure is easy to ensure unsealing, realizes the complete sealing of the ball valve structure, and ensures that the sealing capacity of the ball valve is increased along with the increase of the medium pressure, thereby ensuring the sealing reliability of the ball valve.

Drawings

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

FIG. 1 is a schematic perspective view of a low temperature resistant ball valve in an embodiment of the present application;

FIG. 2 is a schematic diagram illustrating structural disassembly of a low temperature resistant ball valve in an embodiment of the present application;

FIG. 3 is a schematic structural view of a first polytetrafluoroethylene seal ring according to an embodiment of the present application;

fig. 4 is a schematic structural view of a movable knob according to an embodiment of the present application.

Reference numerals: 1. a ball valve body; 2. a valve core; 3. fixing the cover plate; 4. a movable knob; 5. a knob fixing block; 6. a first polytetrafluoroethylene sealing ring; 7. a first hydrogenated butyl cyanide seal ring; 8. a limit fixing plate; 9. a limit screw; 10. a second hydrogenated butyl cyanide sealing ring; 11. and a second polytetrafluoroethylene sealing ring.

Detailed Description

The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.

In this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising … …" does not exclude the presence of other like elements in a process, method, article or apparatus that comprises the element.

Please refer to fig. 1-4

The low temperature resistant ball valve shown in fig. 1 and 2 comprises a ball valve body 1, a valve core 2, a fixed cover plate 3, a movable knob 4 and a knob fixing block 5.

The valve core 2 is of a hollow sphere structure and is arranged in the ball valve main body 1, the valve core 2 can be formed by hollowing out solid metal processing, and the surface polishing treatment is carried out until the valve core 2 is completely matched with a sealing ring which is described below, the surface processing precision of the valve core 2 is controlled within a tolerance of 0.02mm, and the surface finish is of grade 9. Be provided with the knob butt joint hole on the case 2, be provided with the knob mounting hole on the ball valve main part 1, the bottom of activity knob 4 penetrates ball valve main part 1 from the knob mounting hole and extends to in the knob butt joint hole and link to each other with the knob butt joint hole, thereby the lower part setting bit of activity knob 4 peg graft complex structural shape mutually with the knob butt joint hole, through the connection of activity knob 4 and knob butt joint hole, rotates activity knob 4 and makes case 2 rotatory in ball valve main part 1 realize the on-off control of ball valve.

The knob fixing block 5 is sleeved on the upper portion of the movable knob 4 and is connected with the ball valve main body 1, so that the movable knob 4 is installed on the ball valve main body 1, and in the embodiment, the knob fixing block 5 is fixed with the ball valve main body 1 through a screw in a threaded manner. Meanwhile, in this embodiment, as shown in fig. 4, a plurality of seal grooves 401 are provided on the movable knob 4, and a second hydrogenated nitrile seal ring 10 and a second polytetrafluoroethylene seal ring 11 are embedded in the seal grooves 401, that is, the movable knob 4 is sealed between the second hydrogenated nitrile seal ring 10, the second polytetrafluoroethylene seal ring 11 and the ball valve body 1. In this embodiment, the second butyl cyanide sealing ring 10 is installed by adopting an embedded installation mode, so that the second butyl cyanide sealing ring 10 can be firmly embedded and not deformed, and the depth of the recess is designed to be 0.2mm higher than the installation surface after the second butyl cyanide sealing ring 10 is installed.

The ball valve is characterized in that an inlet and an outlet are formed in the ball valve body 1 and the valve core 2, the inlet of the ball valve body 1 is communicated with the inlet of the valve core 2 and the outlet of the ball valve body 1 is communicated with the outlet of the valve core 2 in an initial state, at the moment, the ball valve is conducted, and the ball valve can be cut off after the movable knob 4 is screwed to drive the valve core 2 to rotate so that the inlet of the ball valve body 1 is staggered with the inlet of the valve core 2. The inlet and the outlet of the ball valve main body 1 are both provided with a fixed cover plate 3, a first hydrogenated butyl cyanide sealing ring 7 and a first polytetrafluoroethylene sealing ring 6 are sequentially arranged on one side of the fixed cover plate 3, facing the ball valve main body 1, of the ball valve main body 1, namely, the inlet and the outlet of the valve core 2 are sealed through the first hydrogenated butyl cyanide sealing ring 7 and the first polytetrafluoroethylene sealing ring 6 and the ball valve main body 1. Similarly, the first butyl cyanide sealing ring 7 is installed in an embedded installation mode, as shown in fig. 3, a groove is formed in one side, facing the first butyl cyanide sealing ring 7, of the first polytetrafluoroethylene sealing ring 6, so that the first butyl cyanide sealing ring 7 can be firmly embedded into the groove of the first butyl cyanide sealing ring 7 to be not deformed, and the depth of the groove is designed to be 0.2mm higher than the installation surface after the first butyl cyanide sealing ring 7 is installed.

It should be noted that the above-mentioned second butyl cyanide seal ring 10, second polytetrafluoroethylene seal ring 11, first butyl cyanide seal ring 7, and first polytetrafluoroethylene seal ring 6 are introduced by terms of "first" and "second" for descriptive purposes only, and are intended to distinguish between different seal rings for easy understanding.

As a preferred embodiment of the present embodiment, the fixed cover plate 3 is embedded in the outer wall of the ball valve body 1, which has the advantage that the sealing property between the fixed cover plate 3 and the ball valve body 1 is improved by means of embedding installation, so that the sealing property between the valve core 2 and the ball valve body 1 is ensured.

In a possible implementation manner, the top end of the movable knob 4 extends to the outside of the ball valve main body 1, a limiting fixing plate 8 is sleeved on the part of the movable knob 4 exposed out of the ball valve main body 1, a limiting screw 9 is installed on the knob fixing block 5, a rotation limiting groove is formed in the limiting fixing plate 8, and the limiting screw 9 and the rotation limiting groove cooperate to limit the rotation of the limiting fixing plate 8, namely, the rotation angle of the movable knob 4 is limited by the limiting screw 9 and the limiting fixing plate 8. Referring back to fig. 1, in this embodiment, the rotatable angle of the movable fixing plate 8 is 180 °, so that the purpose of setting is to avoid the situation that the sealing ring is deformed abnormally due to the large-amplitude rotation of the valve core 2 in the ball valve body 1 by limiting the rotation angle of the valve core 2, thereby avoiding the influence on the sealing effect of the sealing ring.

In the above description, the terms "bottom", "lower", "upper", "top", and the like indicate an orientation or a positional relationship, and the orientation or the positional relationship may be defined based on the orientation or the positional relationship shown in the drawings.

Working principle: the second hydrogenated nitrile sealing ring 10, the second polytetrafluoroethylene sealing ring 11, the first hydrogenated nitrile sealing ring 7 and the first polytetrafluoroethylene sealing ring 6 are correspondingly arranged at corresponding positions, and the valve core 2, the fixed cover plate 3, the movable knob 4, the knob fixing block 5, the limit fixing plate 8 and the limit screw 9 are sequentially abutted by flanges and fixed by screws to complete the assembly of the ball valve. The valve core 2 is that the opening of the valve core 2 is communicated with the opening of the ball valve body 1 in the ball valve body 1, and the ball valve is conducted. When the movable knob 4 is rotated, the valve core 2 is driven to rotate by the movable knob 4, so that the opening of the valve core 2 rotates in a collision-free manner, the opening of the valve core 2 is dislocated with the opening of the ball valve body 1, and the ball valve is cut off.

Based on practical use, it is not difficult to find that the failure of the sealing effect of the ball valve is a major cause of air leakage caused by low temperature (-41 ℃), and the failure of the sealing effect is caused by cold shrinkage of the sealing member. In theory, the problem of air leakage at low temperature (-41 ℃) can be solved by replacing the sealing ring which can resist low temperature, then experiments prove that only the sealing material is changed or the air leakage condition can occur, only the air leakage degree is achieved, and the probability of the air leakage is less than that of the conventional sealing ring. Therefore, the ball valve sealing reliability under the low-temperature (-41 ℃) condition is further increased by changing the connection mode of ball valve connection setting and sealing element installation design. In addition, the switch of the ball valve cuts off or adjusts the medium, all needs the case 2 to accomplish, and the quality requirement and the precision of case 2 are vital, and this embodiment guarantees the rigidity and the leakproofness of case 2 through solid metalworking, again through the polishing of surface high accuracy, makes case 2 and sealing member's friction more add the smooth no card of silk, improves sealed effect better.

Finally, it should be noted that: the foregoing description is only a preferred embodiment of the present application, and although the present application has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the technical solutions described in the foregoing embodiments, or equivalents may be substituted for some of the technical features thereof, and any modifications, equivalents, improvements or changes that fall within the spirit and principles of the present application are intended to be included in the scope of protection of the present application.

Claims

1. A low temperature resistant ball valve comprises a ball valve main body (1), a valve core (2), a fixed cover plate (3), a movable knob (4) and a knob fixed block (5); the ball valve is characterized in that the valve core (2) is arranged in the ball valve main body (1), a knob butt joint hole is formed in the valve core (2), a knob mounting hole is formed in the ball valve main body (1), and the bottom end of the movable knob (4) penetrates into the ball valve main body (1) from the knob mounting hole and extends into the knob butt joint hole to be connected with the knob butt joint hole; the knob fixing block (5) is sleeved on the upper part of the movable knob (4) and is connected with the ball valve main body (1), so that the movable knob (4) is installed on the ball valve main body (1); the ball valve comprises a ball valve body (1) and a valve core (2), wherein an inlet and an outlet are formed in the ball valve body (1) and the valve core (2), in an initial state, the inlet of the ball valve body (1) is communicated with the inlet of the valve core (2), and the outlet of the ball valve body (1) is communicated with the outlet of the valve core (2); the inlet and the outlet of the ball valve main body (1) are respectively provided with the fixed cover plate (3), and a first butyl cyanide sealing ring (7) and a first polytetrafluoroethylene sealing ring (6) are sequentially arranged on one side of the fixed cover plate (3) towards the ball valve main body (1).

2. The low temperature resistant ball valve according to claim 1, wherein the top end of the movable knob (4) extends to the outside of the ball valve main body (1), a limiting fixing plate (8) is sleeved on the part of the movable knob (4) exposed out of the ball valve main body (1), a limiting screw (9) is mounted on the knob fixing block (5), a rotation limiting groove is formed in the limiting fixing plate (8), and the limiting screw (9) and the rotation limiting groove cooperate to limit rotation of the limiting fixing plate (8).

3. The low temperature resistant ball valve according to claim 1, wherein a plurality of sealing grooves (401) are formed in the movable knob (4), and a second butyl cyanide sealing ring (10) and a second polytetrafluoroethylene sealing ring (11) are embedded in the sealing grooves (401).

4. The low temperature resistant ball valve according to claim 1, characterized in that the fixed cover plate (3) is embedded on the outer wall of the ball valve body (1).