Positive and negative pressure bidirectional sealing vacuum ball valve

Abstract

The utility model discloses a positive and negative pressure two-way sealing vacuum ball valve, which relates to the technical field of vacuum ball valves, and comprises a valve body and a valve ball, the valve ball is positioned in a ball cavity in the valve body, side directional sleeves are mounted at positions, corresponding to two ends of the valve ball, of the ball cavity in the valve body, and directional sealing ring pieces are mounted at positions, corresponding to the valve ball, of the side directional sleeves. A hollow opening cavity is formed in the side directional sleeve, a rotating ring and a backflow ring piece are arranged at the positions, corresponding to the two ends of the valve ball, of the valve body respectively, and the rotating ring is rotationally connected in the valve body. On the basis of a conventional sealing structure, a reinforced sealing mode of bidirectional compression and densification is adopted, and the reinforced sealing mode is characterized in that secondary reinforcement is carried out on the directional sealing ring pieces in the corresponding positions through pressure changes generated by fluid instantly at the moment of switching fluid flowing states, so that the pressure changes in different use states are met in this way, and the sealing effect of the directional sealing ring pieces is improved. And the overall sealing performance is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of vacuum ball valves, in particular to a vacuum ball valve with positive and negative pressure bidirectional sealing. Background Art

[0002] The main difference between vacuum ball valves and ordinary ball valves lies in the design structure, purpose, performance and scope of application. Its essence is still a pipeline structure that controls the flow of fluid, and its main structure is composed of valve stem, valve core and outer shell. It should be noted that the sealing performance of vacuum ball valve is one of the key factors affecting the use effect.

[0003] Conventional sealing methods in vacuum ball valves are mainly based on sealing rings, but it needs to be further explained that: especially in the process of regulating flow, the fluid in the channels on both sides of the valve core will generate obvious pressure in a short period of time, and the direction of the pressure difference will be different. For example, the pressure on the left side is greater than the pressure on the right side, resulting in a positive pressure difference; the pressure on the left side is less than the pressure on the right side, resulting in a negative pressure difference. If a traditional sealing ring structure is used, it is difficult to apply the above pressure difference.

[0004] This application proposes a solution to this problem. Utility Model Content

[0005] The utility model aims to provide a vacuum ball valve with positive and negative pressure bidirectional sealing, aiming at the current vacuum ball valve having opposite directions or different pressure differences during use, and the corresponding valve core sealing structure is difficult to meet the above use requirements.

[0006] The purpose of the utility model can be achieved through the following technical solutions: a positive and negative pressure bidirectional sealed vacuum ball valve, comprising a valve body and a valve ball, the valve ball is located in a ball cavity inside the valve body, side directional sleeves are installed at both ends of the ball cavity inside the valve body corresponding to the valve ball, directional sealing rings are installed at the positions of the side directional sleeves corresponding to the valve ball, and a hollow opening cavity is opened in the side directional sleeve;

[0007] A swivel and a return ring are respectively provided at two ends of the valve body corresponding to the valve ball. The swivel is rotatably connected in the valve body, the return ring is installed in the side directional sleeve, and a slip ring is installed in the return ring. A left pressure ring corresponding to the directional sealing ring is installed at one end of the swivel corresponding to the valve ball.

[0008] It is further configured as follows: the left pressure ring and the return ring are arranged along the direction from the water inlet end to the water outlet end of the valve body.

[0009] It is further configured as follows: a blade turbine is installed at the center point of the inner part of the rotating ring.

[0010] It is further configured as follows: a plurality of pressurizing protrusions are installed on the inner wall of the left pressure ring close to the return ring sheet, and the inner wall curvature of the left pressure ring is equal to the outer wall curvature of the directional sealing ring sheet at the corresponding position.

[0011] It is further configured as follows: the return ring is in a downwardly inclined arc shape from the water inlet end to the water outlet end of the valve body, the slip flow ring is installed at the lower side of the return ring, and one end of the slip flow ring extends to the open cavity at the corresponding position.

[0012] It is further configured that: the slipstream ring sheet is in an upwardly curved arc shape along the direction from the water outlet end to the water inlet end of the valve body.

[0013] The utility model has the following beneficial effects:

[0014] 1. The overall structure is based on the sealing structure adopted in the current ball valve and the directional sealing ring. The left pressure ring and the return ring are respectively arranged at the two directional positions in the corresponding fluid flow process. On the basis of the directional sealing ring completing the sealing operation of the valve ball, the pressure difference generated instantly when the fluid switches the flow state is used to perform secondary reinforcement and pressurization on the directional sealing ring. Taking the left pressure ring as an example, the fluid is driven to convert through the blade turbine to perform variable speed rotation, so as to cooperate with the left pressure ring to perform variable speed rotation, and the directional sealing ring at the corresponding position is multi-directionally extruded and reinforced by itself and the pressurized protrusion, so as to improve the sealing performance at the moment of fluid switching;

[0015] 2. The explanation using the reflux ring is that the reflux ring will not actively interfere with the flow state of the fluid. Instead, when the fluid switches its flow state, the fluid in this area will form a reverse pressure. Based on the reverse pressure, the reverse pressure is transmitted to the slip flow ring through the reflux ring, further improving the sealing performance of the directional sealing ring at the corresponding position. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 This is a structural schematic diagram of a vacuum ball valve with positive and negative pressure bidirectional sealing proposed by the utility model;

[0018] Figure 2 This is a cross-sectional view of a valve body in a vacuum ball valve with positive and negative pressure bidirectional sealing proposed by the utility model;

[0019] Figure 3This is a cross-sectional view of a valve ball in a vacuum ball valve with positive and negative pressure bidirectional sealing proposed by the utility model;

[0020] Figure 4 The utility model proposes a vacuum ball valve with positive and negative pressure bidirectional sealing. Figure 3 A front view of

[0021] Figure 5 The utility model discloses a schematic diagram of the structure of a left pressure ring in a vacuum ball valve with positive and negative pressure bidirectional sealing.

[0022] In the figure: 1. valve body; 2. valve ball; 3. side directional sleeve; 4. swivel; 5. blade turbine; 6. left pressure ring; 7. slip flow ring; 8. opening cavity; 9. return ring; 10. directional sealing ring; 11. pressure protrusion. DETAILED DESCRIPTION

[0023] The technical solution of the utility model will be described clearly and completely in conjunction with the embodiments below. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] Embodiment 1

[0025] At the moment when the fluid in the vacuum ball valve switches its flow state, the fluid in the channels on both sides of the valve core generates obvious pressure in a short time, and the direction of the pressure difference is different. For example, the pressure on the left side is greater than the pressure on the right side, resulting in a positive pressure difference; the pressure on the left side is less than the pressure on the right side, resulting in a negative pressure difference. If the traditional sealing ring structure is used, it is difficult to apply the above pressure difference. The following technical solutions are proposed:

[0026] Reference Figures 1 to 5 In this embodiment, a positive and negative pressure bidirectional sealed vacuum ball valve comprises a valve body 1 and a valve ball 2. The valve ball 2 is located in a ball cavity inside the valve body 1. Side directional sleeves 3 are installed at both ends of the ball cavity inside the valve body 1 corresponding to the valve ball 2. A directional sealing ring sheet 10 is installed at the position of the side directional sleeve 3 corresponding to the valve ball 2. A hollow opening cavity 8 is opened in the side directional sleeve 3.

[0027] A swivel 4 and a return ring piece 9 are respectively provided at the two ends of the valve body 1 corresponding to the valve ball 2. The swivel 4 is rotatably connected in the valve body 1. The return ring piece 9 is installed in the side directional sleeve 3, and a slip ring piece 7 is installed in the return ring piece 9. A left pressure ring 6 corresponding to the directional sealing ring piece 10 is installed at one end of the swivel 4 corresponding to the valve ball 2. The left pressure ring 6 and the return ring piece 9 are arranged along the direction from the water inlet end to the water outlet end of the valve body 1. A blade turbine 5 is installed at the center point of the inner part of the swivel 4. A plurality of pressurizing protrusions 11 are installed on the inner wall of the left pressure ring 6 close to the return ring piece 9, and the inner wall curvature of the left pressure ring 6 is equal to the outer wall curvature of the directional sealing ring piece 10 at the corresponding position.

[0028] Technical principle: First, explain the pressure difference generated during the use of the vacuum ball valve: refer to Figure 4 When the fluid flows from left to right and the valve ball 2 switches its angle, the flow rate / flow velocity of the fluid changes instantly. For example, when the flow rate is adjusted from a small flow rate to a large flow rate, a large pressure is instantly generated at the left side of the valve ball 2; conversely, when the flow rate is adjusted from a large flow rate to a small flow rate, a reverse pressure is instantly generated at the right side of the valve ball 2.

[0029] Refer to this Figure 5 To explain, during the stable operation of the valve body 1, the swivel ring 4 therein maintains continuous rotation. During this process, the left pressure ring 6 applies stable pressure on the directional sealing ring piece 10, thereby preliminarily reinforcing and encrypting the directional sealing ring piece 10 on this basis. However, when the fluid flow rate increases, the instantaneous pressure directly acts on the blade turbine 5, accelerating the rotation speed of the left pressure ring 6. During this process, the left pressure ring 6 performs secondary reinforcement and encryption on the directional sealing ring piece 10; and on an indirect basis, the fluid always fills the open cavity 8 in the left position, so that the pressure of the fluid itself can also be used to reinforce and pressurize the directional sealing ring piece 10, thereby completing the sealing performance of the valve ball 2 in the left position.

[0030] Embodiment 2

[0031] This embodiment is to explain the reflux ring in the first embodiment:

[0032] The return ring piece 9 is in a downward inclined arc shape along the direction from the water inlet end to the water outlet end of the valve body 1, and the slip flow ring piece 7 is installed at the lower side of the return ring piece 9, and one end of the slip flow ring piece 7 extends to the open cavity 8 at the corresponding position, and the slip flow ring piece 7 is in an upward curved arc shape along the direction from the water outlet end to the water inlet end of the valve body 1.

[0033] Technical principle: In the first embodiment, when the fluid always flows from left to right, refer to Figure 4For example, the return ring piece 9 is always bent upward by the action of the fluid, and the slip ring piece 7 is opened to continue to fill the open cavity 8 to the right with the fluid;

[0034] However, in the process of adjusting from a large flow rate to a small flow rate, the fluid will rebound to the right. During this process, the fluid forces the return ring 9 to deform from top to bottom. During this process, the return ring 9 will also indirectly force the slipstream ring 7 to continue to deform, thereby performing secondary reinforcement and encryption on the directional sealing ring 10 in the opening cavity 8 on the right side.

[0035] In summary: based on the conventional sealing structure, a two-way pressure-encrypted reinforcement sealing method is adopted. At the moment of switching the fluid flow state, the pressure change generated instantly by the fluid is used to perform secondary reinforcement on the directional sealing ring in the corresponding position. In this way, the pressure changes under different usage conditions are met and the overall sealing performance is improved.

[0036] The above contents are merely examples and explanations of the structure of the utility model. The technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the structure of the utility model or exceed the scope defined in the claims, they should all fall within the protection scope of the utility model.

[0037] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0038] The preferred embodiments of the utility model disclosed above are only used to help explain the utility model. The preferred embodiments do not describe all the details in detail, nor do they limit the utility model to only specific implementation methods. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the utility model, so that technicians in the relevant technical field can well understand and use the utility model. The utility model is only limited by the claims and their full scope and equivalents.

Claims

1. A vacuum ball valve with positive and negative pressure bidirectional sealing, comprising a valve body (1) and a valve ball (2), characterized in that: The valve ball (2) is located in the ball cavity inside the valve body (1), and side directional sleeves (3) are installed at both ends of the ball cavity inside the valve body (1) corresponding to the valve ball (2), and directional sealing rings (10) are installed at the positions of the side directional sleeves (3) corresponding to the valve ball (2), and a hollow opening cavity (8) is opened in the side directional sleeve (3); The valve body (1) is provided with a swivel (4) and a return ring (9) at two ends corresponding to the valve ball (2), respectively; the swivel (4) is rotatably connected in the valve body (1); the return ring (9) is installed in the side directional sleeve (3), and a slip ring (7) is installed in the return ring (9); and a left pressure ring (6) corresponding to the directional sealing ring (10) is installed at one end of the swivel (4) corresponding to the valve ball (2).

2. A positive and negative pressure bidirectional sealing vacuum ball valve according to claim 1, characterized in that: The left pressure ring (6) and the return ring sheet (9) are arranged along the direction from the water inlet end to the water outlet end of the valve body (1).

3. The vacuum ball valve with positive and negative pressure bidirectional sealing according to claim 1, characterized in that: A blade turbine (5) is installed at the center point inside the rotating ring (4).

4. The vacuum ball valve with positive and negative pressure bidirectional sealing according to claim 1, characterized in that: A plurality of pressure protrusions (11) are installed on the inner wall of the left pressure ring (6) close to the return ring sheet (9), and the inner wall curvature of the left pressure ring (6) is equal to the outer wall curvature of the directional sealing ring sheet (10) at the corresponding position.

5. The vacuum ball valve with positive and negative pressure bidirectional sealing according to claim 1, characterized in that: The return ring (9) is in a downwardly inclined arc shape along the direction from the water inlet end to the water outlet end of the valve body (1), and the slip flow ring (7) is installed at a lower position of the return ring (9), and one end of the slip flow ring (7) extends into an open cavity (8) at a corresponding position.

6. A vacuum ball valve with positive and negative pressure bidirectional sealing according to claim 5, characterized in that: The slipstream ring piece (7) is in an upwardly curved arc shape along the direction from the water outlet end to the water inlet end of the valve body (1).

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