CN220102165U - Sealing structure of valve ball and ball valve - Google Patents

Abstract

The application of the utility model discloses a sealing structure of a valve ball and a ball valve, comprising: the valve comprises a valve body, a valve ball and a sealing piece, wherein a connecting hole and a containing cavity are formed in the valve body, and the connecting hole is communicated with the containing cavity; the valve ball is arranged in the containing cavity; the sealing element is partially arranged in the connecting hole, one end face of the sealing element is in fit contact with the spherical surface of the valve ball, and a protruding structure for limiting the sealing element to move towards the valve ball side is integrally formed on the inner wall of the connecting hole. In this technical scheme, through the protruding structure of integrative preparation on the connecting hole inner wall in the valve body, solved along with the valve ball switch to half open state by closing, originally in the sealing member with the valve ball surface close contact laminating and then become the part of separation and take place deformation owing to receive the impact force that flows through the fluid, appear the sealing member damage then finally lead to the problem that the valve body leaked, finally realized protection sealing member, maintenance equipment normal use's purpose.

Description

Sealing structure of valve ball and ball valve

Technical Field

The utility model relates to the technical field of ball valves, in particular to a sealing structure of a valve ball and the ball valve.

Background

Ball valves (ball valves) have been developed in the 50 s of the 20 th century, and with the continuous development of technology, the use of ball valves in western industrialized countries is rising year by year, and are widely used in industries such as petroleum, long-distance pipelines, chemical industry, papermaking, pharmacy, water conservancy, municipal administration, steel, thermal power, etc. Its valve ball can be rotated by 90 deg. usually, and its cock body is a sphere with a circular through hole or channel passing through its axis. The ball valve is mainly used for cutting off, distributing and changing the flow direction of a medium in a pipeline, and can be tightly closed only by rotating by 90 degrees and small rotating moment, so that the ball valve is very suitable for being used as a switch and a cut-off valve.

In general, the tightness of the valve body and the valve ball of a ball valve directly affects the quality of the ball valve. In particular, in the actual use process, the sealing element at the joint of the valve body and the valve ball is a wearing part, which relates to a plurality of factors such as industry, working environment, materials and the like, and one of the important reasons is that: because of the process requirements, operators often do not rotate the valve ball to a 90-degree opening degree when using the valve ball, namely, the ball valve is always in a half-open state, so that fluid in the reaction kettle or the storage tank flows through the valve body, and meanwhile, the flowing fluid can impact the traditional sealing element 002.

As shown in fig. 1, when the ball valve is in a fully opened state, the end surface of the conventional seal 002 is in full close fitting contact with the surface of the ball valve; when the ball valve is in a closed state (not shown in the figure), the end surface of the conventional sealing element 002 is also in full close contact with the surface of the ball valve; when the ball valve is in a half-open state, as the ball valve rotates by a certain angle (a certain angle refers to the condition that the rotation angle is smaller than 90 degrees), the traditional sealing element 002 is separated from the surface of the ball valve, so that the part loses the propping force given by the surface of the ball valve, and the part losing the propping force of the ball valve deforms due to the impact force of fluid after the part loses the traditional sealing element 002, and then the ball valve leaks slightly; and then the ball valve is continuously switched among the on, off and half-on states in the use process, the deformed part of the traditional sealing element 002 is further worn, the deformation degree of the traditional sealing element 002 is also larger and larger, the ball valve is changed into serious leakage from slight leakage, and finally even if the ball valve is in a completely closed state, the traditional sealing element 002 can deviate from the sealing position in the original valve body due to deformation, so that the sealing effect cannot be realized. To ensure the normal use of the ball valve and the safety of the site, operators have to replace the conventional sealing element 002, even frequently replace the conventional sealing element 002, and in some cases replace the whole ball valve, which causes huge consumption of equipment and greatly increases the production cost.

Therefore, it is needed to design a ball valve with a novel sealing structure, to locate and fix the traditional sealing element 002 placed in the traditional valve body 001, to reduce or even avoid the impact of the fluid on the traditional sealing element 002 when the valve ball is in the half-open state, to form a certain protection on the traditional sealing element 002, so that the ball valve is not easy to be damaged, and the service life of the sealing element is prolonged.

Disclosure of Invention

The utility model provides a sealing structure of a valve ball and the ball valve, which are used for solving the problems in the prior art.

To achieve the above object, a first aspect of the present utility model provides a sealing structure of a valve ball, comprising: the valve comprises a valve body, a valve ball and a sealing piece, wherein a connecting hole and a containing cavity are formed in the valve body, and the connecting hole is communicated with the containing cavity; the valve ball is arranged in the containing cavity; the sealing element is partially arranged in the connecting hole, one end face of the sealing element is in fit contact with the spherical surface of the valve ball, and a protruding structure for limiting the sealing element to move towards the valve ball side is integrally formed on the inner wall of the connecting hole.

Further, the protruding structure is at least two protruding points arranged along the circumference of the inner wall of the connecting hole.

Further, the protruding structure is an annular protrusion, and the annular protrusion forms a first step hole and a second step hole at one end of the connecting hole.

Further, the aperture of the first step hole is smaller than that of the second step hole; the seal comprises a first annular section and a second annular section, the diameter of the first annular section being smaller than the diameter of the second annular section; the second annular section is hermetically arranged in the second step hole; the first annular segment is partially sealingly mounted within the first stepped bore, and a spherical end surface of the first annular segment is in sealing contact with the valve ball.

Further, the valve plug is detachably connected with the connecting hole and is abutted with the sealing element.

Further, a sealing ring is sleeved on the valve plug.

Further, an annular groove is formed in one end part of the valve plug, which is close to the sealing element, and a sealing ring is sleeved on the annular groove; the connecting hole also comprises a third step hole for connecting the valve plug, and the bottom wall of the third step hole is in fit contact with the sealing ring.

Further, the third stepped hole is a threaded hole.

Further, the sealing device also comprises an O-shaped ring, wherein one part of the O-shaped ring is embedded in an annular groove formed in the end face of the valve plug, and the other part of the O-shaped ring is in sealing contact with the sealing element.

The second aspect of the utility model also provides a ball valve, comprising the sealing structure of the ball valve.

The utility model has the advantages and positive effects that:

1. according to the sealing structure of the valve ball, the structure of the connecting hole in the valve body is improved, and the inner wall of the connecting hole is provided with the protruding structure. When the ball valve is in a half-open state, the protruding structure applies a propping force to the part of the sealing element separated from the surface of the valve ball so as to resist the impact force of fluid flowing through to the separating part of the sealing element, ensure that the sealing element is kept in the original state, and avoid deformation or damage of the sealing element. The problem that the sealing element is easy to damage because the valve ball is in a half-open state in the using process is solved, and the normal operation of the equipment is maintained. The operation is simple, and the sealing performance is strong.

2. According to the sealing structure of the valve ball, provided by the utility model, the concentricity of the sealing element and the valve ball is better ensured through the protruding structure which is integrally processed in the valve body and is used for limiting the sealing element, and the sealing performance of the sealing structure and the service life of the sealing element are improved.

3. According to the sealing structure of the valve ball, the protruding structure is annularly arranged on the inner wall of the connecting hole, so that the annular protruding structure is formed, the sealing element can be fixed and protected in a wider range, and the protection effect is better.

4. The sealing structure of the valve ball is provided with the first step hole and the second step hole, and the second step hole is used for accommodating the second annular section and is used for accommodating the second annular section when the sealing element is impacted by fluid. The bottom wall of the second stepped bore may generate a force against the second annular segment to resist the impact force of the fluid, preventing the shape of the seal from being altered by the impact of the fluid.

5. According to the sealing structure of the valve ball, the sealing ring is arranged, so that the sealing performance of the valve ball can be improved, the technical scheme is more strict, and the valve ball is safer to use.

6. According to the sealing structure of the valve ball, the third step hole is formed, the sealing ring is arranged at the bottom wall of the third step hole and is clamped with the annular groove of the valve plug, and the sealing performance of the valve ball is further enhanced.

7. According to the sealing structure of the valve ball, the third step hole in the valve body is connected with the valve plug through the threads, so that the threaded installation is firm in connection effect, and the detachable structure is very convenient to install and detach.

8. According to the sealing structure of the valve ball, the O-shaped ring is arranged at the end face of the valve plug, which is abutted against the sealing piece, so that the sealing performance of the sealing structure is further enhanced.

9. The ball valve provided by the utility model has the advantages that the sealing structure of the valve ball is adopted, so that the sealing structure of the valve ball has all the advantages.

10. In general, the sealing structure of the valve ball and the ball valve have the advantages of simple structure, firm connection, strong sealing performance, stable performance, durability, simple and convenient installation, easy manufacture, safety, reliability and the like.

Drawings

FIG. 1 is a schematic view of the structure of the interior of a prior art valve ball;

FIG. 2 is a schematic view of the structure of the inside of the sealing structure of the present valve ball according to the present utility model;

FIG. 3 is a schematic view of the structure of the interior of the valve body of the present utility model;

FIG. 4 is a schematic view of the seal of the present utility model;

fig. 5 is a schematic view of the structure of the valve plug in the present utility model.

Description of the reference numerals

001. A conventional valve body; 002. a conventional seal; 1. a valve body; 101. a connection hole; 101a, a first stepped hole; 101b, a second stepped hole; 101c, a third step hole; 102. a cavity; 2. a valve ball; 3. a seal; 301. a first annular segment; 302. a second annular segment; 4. a valve plug; 401. an outer peripheral surface; 402. an annular groove; 403. an annular groove; 5. a seal ring; 6. an O-ring.

Detailed Description

The following describes the embodiments of the present application in detail with reference to the drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the disclosure, are not intended to limit the disclosure.

In the technical solutions disclosed in the present application, unless otherwise stated, terms such as "upper, lower, left and right" are generally defined with reference to the direction of the drawing plane of the corresponding drawing, and "inner and outer" are defined with reference to the inner and outer sides of the outline of the component or structure itself. In addition, it should be noted that terms such as "first, second", etc. are used to distinguish one element from another element without order or importance. In addition, in the description with reference to the drawings, like reference numerals in different drawings denote like elements

According to a first aspect of the present utility model, as shown in fig. 2, a sealing structure for a valve ball includes: the valve comprises a valve body 1, a valve ball 2 and a sealing element 3, wherein as shown in fig. 3, a connecting hole 101 and a containing cavity 102 are formed in the valve body 1, and the connecting hole 101 is communicated with the containing cavity 102; the valve ball 2 is arranged in the containing cavity 102; the sealing element 3 is partially arranged at the connecting hole 101 and penetrates through the connecting hole 101, one end face of the sealing element 3 is in contact with the spherical surface of the valve ball 2, and a protruding structure for limiting the sealing element 3 to move towards the valve ball 2 is integrally formed on the inner wall of the connecting hole 101.

In the above-described solution, a protrusion structure for restricting the movement of the seal 3 toward the valve ball 2 side is formed on the inner wall of the connection hole 101 in the valve body 1. When the valve ball 2 rotates to an opening degree smaller than 90 degrees, that is, the valve ball 2 is in a half-open state, at this time, part of the sealing member 3 is originally in close contact with the surface of the valve ball 2 and is changed to be separated from the surface of the valve ball 2, meanwhile, fluid flows through the connecting hole 101, the flowing fluid tends to flow fast and has huge pressure, violently impacts the sealing member 3, the part of the sealing member 3 separated from the surface of the valve ball 2 loses the abutting force given by the valve ball 2, at this time, the abutting force needs to be applied to the part of the sealing member 3 by virtue of the protruding structure formed on the inner wall of the connecting hole 101 so as to resist the impact force of the flowing fluid, the sealing member 3 is protected, and the part of the sealing member 3 is prevented from being deformed due to the long-time impact force of the fluid, so that the sealing member 3 is intact. Meanwhile, due to the design that the protruding structure is integrally arranged on the inner wall of the connecting hole 101, the limiting effect on the sealing element 3 is better, the concentricity of the sealing element 3 and the valve ball 2 is better ensured, and the tightness and the service life of the sealing element 3 are improved.

According to the technical scheme, the structure of the connecting hole 101 in the valve body 1 is improved, so that the sealing element 3 is ensured to be intact when the valve is in a half-open state, and the sealing element 3 is ensured not to be frequently replaced in the use process.

In this embodiment, the protruding structure is at least two protruding points provided along the circumference of the inner wall of the connection hole 101. Generally, the purpose of the technical scheme can be achieved by arranging two convex points, and the cost is saved.

In this embodiment, protruding structure annular sets up on the inner wall of connecting hole 101, and protruding structure is annular protruding promptly to have bigger coverage to sealing member 3, ensure that sealing member 3 when receiving the impact force of fluid, all terminal surfaces all receive protruding structure to support the fixed of power, thereby fix and protect sealing member 3 more extensively, the protection effect is better. In addition, the annular protrusion forms a first stepped hole 101a and a second stepped hole 101b at one end of the connection hole 101.

Further, in some embodiments, as shown in fig. 3, the aperture of the first stepped hole 101a is smaller than the aperture of the second stepped hole 101 b; as shown in fig. 4, the seal 3 comprises a first annular section 301 and a second annular section 302, the diameter of the first annular section 301 being smaller than the diameter of the second annular section 302; as shown in fig. 2, the second annular section 302 is sealingly mounted in the second stepped bore 101b, and the outer surface of the second annular section 302 is in contact with the inner surface of the second stepped bore 101 b; the first annular section 301 is partially sealingly mounted at the first stepped bore 101a with the outer surface of the first annular section 301 in contact with the inner surface of the second stepped bore 101b, wherein the spherical end surface of the first annular section 301 is in sealing contact with the spherical surface of the valve ball 2. In the scheme, on the basis of the structural improvement of the valve body 1, the structure of the sealing element 3 is correspondingly improved by combining the valve body 1. Specifically, the diameter of the second annular section 302 is larger than the aperture of the first step hole 101a, the diameter of the second annular section 302 is matched with the aperture of the second step hole 101b, the second step hole 101b is used for accommodating the second annular section 302, and the bottom wall of the second step hole 101b is in contact with the surface of the second annular section 302; the diameter of the first annular segment 301 is adapted to the aperture of the first stepped bore 101a, the first stepped bore 101a being adapted to receive the first annular segment 301.

The first step hole 101a and the second step hole 101b are provided, wherein the second step hole 101b is not only used for accommodating the second annular section 302, but also used for fixing the sealing element 3 and preventing the shape of the sealing element from being changed by the impact of the fluid when the sealing element 3 is impacted by the fluid (usually the second annular section 302 is impacted by the impact), and the bottom wall of the second step hole 101b is closely contacted with the surface of the second annular section 302, so that the bottom wall of the second step hole 101b can generate a propping force on the second annular section 302. In general, the first step hole 101a and the second step hole 101b are arranged, so that the key functions of propping, fixing and protecting the sealing element 3 are integrally achieved, and the ball valve with the sealing structure has better use effect.

In the present embodiment, as shown in fig. 2, the valve plug 4 is further included, and the valve plug 4 is detachably connected to the connection hole 101 and coaxially abuts against the seal member 3.

In some embodiments, as shown in fig. 2, a sealing ring 5 is sleeved on the valve plug 4. The sealing ring 5 is arranged, so that the sealing performance of the ball valve can be improved, the technical scheme is more strict, and the ball valve is safer in use.

Further, in the present embodiment, as shown in fig. 5, an annular groove 402 is formed at one end of the valve plug 4 near the sealing member 3, and a sealing ring 5 is sleeved on the annular groove 402; the connecting hole 101 further comprises a third step hole 101c for connecting the valve plug 4, and the bottom wall of the third step hole 101c is in abutting contact with the sealing ring 5. Specifically, the aperture of the third step hole 101c is generally larger than that of the second step hole 101b, and after the sealing ring 5 is sleeved on the annular groove 402, the sealing ring is tightly attached to the bottom wall of the third step hole 101c and is tightly contacted with the annular groove 402 of the valve plug 4, so that the sealing performance of the valve ball sealing structure is further enhanced.

Further, in the present embodiment, as shown in fig. 2, 3 and 5, the third stepped hole 101c is a threaded hole; generally, the outer circumferential surface 401 of the valve plug 4 is of a threaded structure which is matched with the threads of the third step hole 101c, the third step hole 101c is connected with the valve plug 4 through threads, and the threaded installation is firm in connection effect, can be of a detachable structure and is convenient to install and detach.

In some other specific embodiments, as shown in fig. 2, the present solution further comprises an O-ring 6; as shown in fig. 5, a part of the O-ring 6 is fitted in an annular groove 403 formed in the end surface of the plug 4, and the other part is in sealing contact with the seal 3. This design may further enhance the tightness of the sealing structure.

In addition, the sealing member 3 may be made of materials such as polyoxymethylene and polytetrafluoroethylene, which have wear resistance, certain heat resistance and cold resistance, are resistant to acid, alkali and various organic solvents, are not easy to damage, and have long service life, and are preferable materials of the sealing member 3, and the utility model is not particularly limited herein.

In the embodiment, the sealing ring 5 can be an ethylene-propylene-diene monomer sealing rubber strip which has the advantages of ozone resistance, weather resistance, high temperature resistance, low temperature resistance, chemical resistance and the like, meanwhile, the allowable use temperature ranges from minus 60 ℃ to 150 ℃, and is a preferable material.

On the basis of the technical scheme, the second aspect of the utility model also provides a ball valve, which comprises the sealing structure of the ball valve. Because the ball valve provided by the present disclosure has all the features of the sealing structure of the ball valve, the details are not repeated here.

The application of the utility model exemplarily describes a sealing structure of the valve ball and using steps of the valve ball, and the sealing structure is concretely as follows:

DLTDP production workshop of certain chemical industry enterprises, because of the reason of production technology, the ball valve installed at the bottom of the reaction kettle is required to be in a half-open state at all times, then

S1, firstly, rotating a valve ball 2 of a ball valve by 45 degrees by using a valve wrench to enable the ball valve to be in a half-open state;

s2, a large amount of liquid materials flow into the valve body 1 from the bottom of the reaction kettle through the valve plug 4, and impact is caused to a certain part of the sealing element 3 when the liquid flows through the connecting hole 101;

s3, as the sealing element 3 is placed at the step hole of the connecting hole 101, and the convex structure formed on the inner wall of the connecting hole 101 positions and fixes the sealing element 3, the sealing element 3 resists the impact force of fluid, reduces or even avoids the damage to the sealing element 3, prevents the leakage of the reaction kettle, and ensures the normal operation of the production process.

The preferred embodiments of the present application have been described in detail above with reference to the accompanying drawings, but the present utility model is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solutions of the present application within the scope of the disclosed technical concept, and all the simple modifications belong to the protection scope of the present utility model.

In addition, the specific features described in the above embodiments may be combined in any suitable manner without contradiction. The various possible combinations of the utility model are not described in detail in order to avoid unnecessary repetition.

Furthermore, any combination of the various embodiments of the present application may be made without departing from the spirit of the present disclosure, which should also be considered as disclosed herein.

Claims (10)

1. A sealing structure of a valve ball, comprising: the valve comprises a valve body (1), a valve ball (2) and a sealing piece (3), wherein a connecting hole (101) and a containing cavity (102) are formed in the valve body (1), and the connecting hole (101) is communicated with the containing cavity (102); the valve ball (2) is arranged in the accommodating cavity (102); the sealing element (3) is partially arranged in the connecting hole (101), and one end face of the sealing element (3) is in abutting contact with the spherical surface of the valve ball (2), and the valve ball is characterized in that: a protruding structure for limiting the movement of the sealing element (3) to the valve ball (2) side is integrally formed on the inner wall of the connecting hole (101).

2. The sealing structure of the valve ball according to claim 1, characterized in that: the protruding structure is at least two protruding points arranged along the circumference of the inner wall of the connecting hole (101).

3. The sealing structure of the valve ball according to claim 1, characterized in that: the protruding structure is an annular protruding, and a first step hole (101 a) and a second step hole (101 b) are formed at one end of the connecting hole (101) through the annular protruding.

4. A valve ball sealing structure according to claim 3, wherein:

the aperture of the first step hole (101 a) is smaller than the aperture of the second step hole (101 b);

the seal (3) comprises a first annular section (301) and a second annular section (302), the diameter of the first annular section (301) being smaller than the diameter of the second annular section (302);

the second annular section (302) is mounted in the second stepped hole (101 b) in a sealing manner;

the first annular section (301) is partially and hermetically mounted in the first stepped hole (101 a), and the spherical end surface of the first annular section (301) is in sealing contact with the valve ball (2).

5. A valve ball sealing structure according to any one of claims 1 to 3, characterized in that: the sealing device further comprises a valve plug (4), wherein the valve plug (4) is detachably connected with the connecting hole (101) and is abutted with the sealing element (3).

6. The valve ball sealing structure according to claim 5, wherein: and a sealing ring (5) is sleeved on the valve plug (4).

7. The valve ball sealing structure according to claim 6, wherein:

an annular groove (402) is formed in one end part, close to the sealing piece (3), of the valve plug (4), and the sealing ring (5) is sleeved on the annular groove (402);

the connecting hole (101) further comprises a third step hole (101 c) connected with the valve plug (4), and the bottom wall of the third step hole (101 c) is in fit contact with the sealing ring (5).

8. The valve ball sealing structure according to claim 7, wherein: the third step hole (101 c) is a threaded hole.

9. The valve ball sealing structure according to claim 4, wherein: the sealing device further comprises an O-shaped ring (6), wherein one part of the O-shaped ring (6) is embedded in an annular groove (403) formed in the end face of the valve plug (4), and the other part of the O-shaped ring (6) is in sealing contact with the sealing element (3).

10. A ball valve, characterized by comprising a sealing structure of a valve ball according to any one of claims 1 to 9.