V-shaped ball with pre-pressure-relief function

Abstract

According to the technical scheme, the V-shaped ball with the pre-pressure-relief function is characterized in that the V-shaped ball comprises a spherical body capable of forming hard sealing with a valve seat and two connecting cylinders located above and below the spherical body respectively, and the two connecting cylinders are both communicated with an inner cavity of the spherical body; the switching piece is in a bent shape and can slide relative to the inner wall of the spherical surface body, the two driving pieces are fixedly connected with the two ends of the switching piece correspondingly and are coaxially arranged, the two driving pieces penetrate through the two connecting cylinders correspondingly, and pushing blocks are arranged on the outer walls of the two driving pieces correspondingly; first moving grooves for containing the push blocks are formed in the inner walls of the two connecting cylinders, the arc lengths of the first moving grooves are larger than the arc lengths of the push blocks, the two driving pieces are provided with connecting grooves for being connected with the valve rods, and a pressure relief hole capable of being covered by the switching piece is formed in the spherical body. The switching piece is driven by the driving piece to rotate back and forth relative to the spherical body to control whether the pressure relief hole is communicated with the inner cavity of the spherical body, and the problems that opening is difficult and leakage is prone to occurring in the prior art are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of ball valves, and more specifically to a V-shaped sphere with a pre-pressure relief function. Background Art

[0002] The V-shaped ball valve is a ball valve structure with a special design, and the shape of its sphere presents a contour similar to the letter "V". Compared with traditional ball valves, the V-shaped sphere has a smaller mass than a complete spherical sphere, effectively reducing the required torque and improving the opening and closing efficiency of the ball valve. When blocking the fluid flow, the V-shaped sphere is unidirectionally sealed and pushed by the fluid towards the valve seat, which will cause the static friction force between the V-shaped sphere and the valve seat to increase, resulting in an increase in the required torque and a decrease in the opening efficiency; at the same time, during the opening process, the wear between the V-shaped sphere and the valve seat is aggravated, leading to a decrease in the sealing ability between the V-shaped sphere and the valve seat. Content of the Utility Model

[0003] Aiming at the deficiencies of the existing technology, the purpose of the utility model is to provide a V-shaped sphere that is easy to open and slows down the wear rate.

[0004] To achieve the above purpose, the utility model provides the following technical solution: A V-shaped sphere with a pre-pressure relief function, including a spherical surface body that can form a hard seal with the valve seat and two connecting cylinders that are coaxial and respectively located above and below the spherical surface body. Both of the two connecting cylinders are communicated with the inner cavity of the spherical surface body. It also includes a switching member that is bent and can slide relative to the inner wall of the spherical surface body, and two driving members that are respectively fixedly connected to both ends of the switching member and are coaxially arranged. The two driving members respectively penetrate through the two connecting cylinders. Push blocks are arranged on the outer walls of the two driving members. First moving grooves for accommodating the push blocks and with an arc length greater than the arc length of the push blocks are respectively opened on the inner walls of the two connecting cylinders. Connecting grooves for connecting the valve rod are opened on both of the two driving members. A pressure relief hole that can be covered by the switching member is arranged on the spherical surface body. Whether the pressure relief hole is communicated with the inner cavity of the spherical surface body is controlled by driving the switching member to rotate back and forth relative to the spherical surface body.

[0005] As a further improvement of the utility model, a sealing member that winds around the orifice of the pressure relief hole and can fit with the switching member is arranged on the inner wall of the spherical surface body.

[0006] As a further improvement of the utility model, both sides of the surface of the switching member facing the inner wall of the spherical surface body are chamfered.

[0007] As a further improvement of the utility model, connecting disks with a contour size larger than the contour size of the orifice of the corresponding connecting cylinder are arranged at the ends of the two driving members located in the inner cavity of the spherical surface body, and the two connecting disks are respectively fixedly connected to both ends of the switching member.

[0008] Advantages of the present utility model: The driving member drives the switching member to rotate relative to the spherical body, so that the pressure relief hole communicates with the inner cavity of the spherical body. Such a design can relieve pressure before opening the valve compared with the prior art, effectively reducing the static friction force between the spherical body and the valve seat, thereby reducing the required torque, facilitating the rapid opening of the valve, and at the same time reducing the wear between the spherical body and the valve seat, thus prolonging the service life of the spherical body and the valve seat, and ensuring the stability of the sealing performance. Description of the Drawings

[0009] Figure 1 It is a three-dimensional view of the present utility model when the switching member blocks the pressure relief hole;

[0010] Figure 2 It is a three-dimensional view of the present utility model when the switching member and the pressure relief hole are staggered from each other;

[0011] Figure 3 It is a three-dimensional view of the switching member in the present utility model.

[0012] Reference numerals: 1, spherical body; 2, connecting cylinder; 3, switching member; 4, driving member; 5, push block; 6, first moving groove; 7, connecting groove; 8, pressure relief hole; 9, sealing member; 10, connecting plate. Detailed Embodiment

[0013] The present utility model will be further described in detail below with reference to the drawings and embodiments. The same components are denoted by the same reference numerals.

[0014] Referring to Figures 1 to 3 As shown, a V-shaped sphere with a pre-pressure relief function in this embodiment includes a spherical body 1 that can form a hard seal with the valve seat and two connecting cylinders 2 that are coaxial and are respectively located above and below the spherical body 1. Both connecting cylinders 2 communicate with the inner cavity of the spherical body 1;

[0015] Based on the aforementioned prior art, it further includes a switching member 3 and two driving members 4. The switching member 3 is bent and has the same shape as the edge of the inner cavity of the spherical body 1. The switching member 3 is nearly C-shaped. The switching member 3 can fit with the inner body of the spherical body 1 and can slide relative to the inner wall of the spherical body 1. Both driving members 4 are provided with connecting grooves 7 for inserting one end of the valve stem. Threaded holes communicating with the inner cavity of the connecting groove 7 are machined on the peripheral walls of the two driving members 4. The outer diameters of the two driving members 4 match the inner diameters of the connecting cylinders 2. Push blocks 5 are integrally formed on the outer walls of the two driving members 4. The push blocks 5 are arc-shaped and coaxial with the driving members 4. First moving grooves 6 for accommodating the push blocks 5 are machined on the inner walls of the two connecting cylinders 2. The arc length of the inner cavity of the first moving groove 6 is greater than the arc length of the push block 5. A pressure relief hole 8 connecting the inner cavity of the spherical body 1 and the outside is provided on the spherical body 1. The width of the switching member 3 is greater than the width of the pressure relief hole 8;

[0016] During the assembly process, the switching member 3 is first placed in the inner cavity of the spherical body 1 and the switching member 3 is fitted to the inner wall of the spherical body 1. Subsequently, the two driving members 4 respectively penetrate through the two connecting cylinders 2 and the outer walls of the ends of the two driving members 4 extending into the inner cavity of the spherical body 1 are welded to the end of the switching member 3. One end of the driving member 4 is located outside the connecting cylinder 2 and the threaded hole is also outside the connecting cylinder 2. The utility model can be installed in the valve body. Then, the upper valve stem and the lower valve stem are respectively inserted into the connecting grooves 7 of the two driving members 4 and bolts are screwed into the connecting grooves 7 so that the upper valve stem and the lower valve stem are fixedly connected to the corresponding driving members 4;

[0017] In the initial state, the valve is in an open circuit state. The switching member 3 covers the pressure relief hole 8. At the same time, the switching member 3 will undergo a slight deformation under the pressure of the fluid and closely adhere to the inner wall of the spherical body 1. The push block 5 abuts against the inner wall of one end of the pre-moving groove 6. When the valve is opened, since the mass of the switching member 3 is much smaller than that of the spherical body 1, the valve stem first drives the switching member 3 to rotate relative to the spherical body 1 through the driving member 4 until the push block 5 moves relative to the pre-moving groove 6 to abut against the inner wall of the other end of the pre-moving groove 6. The switching member 3 is completely staggered from the pressure relief hole 8, and the fluid flows through the pressure relief hole 8, thereby reducing the thrust of the fluid received by the spherical body 1. The static friction between the spherical body 1 and the valve seat is reduced. As the driving member 4 drives the spherical body 1 to rotate relative to the valve body through the connecting cylinder 2, the valve is gradually opened; when the valve is closed, the driving member 4 rotates relative to the connecting cylinder 2 and returns to the initial state. The pressure relief hole 8 is blocked by the switching member 3, and then the driving member 4 drives the spherical body 1 to rotate relative to the valve body and returns to the initial state;

[0018] Such a design can relieve pressure before opening the valve compared with the prior art, effectively reduce the static friction between the spherical body 1 and the valve seat, thereby reducing the required torque, facilitating the rapid opening of the valve, and at the same time reducing the wear between the spherical body 1 and the valve seat, thereby prolonging the service life of the spherical body 1 and the valve seat, and ensuring the stability of the sealing performance.

[0019] As a specific embodiment of the improvement, since the inner wall of the spherical body 1 and the switching member 3 can slide relative to each other, there is a machining precision error, resulting in a gap between the switching member 3 and the inner wall of the spherical body 1, causing fluid leakage and preventing the valve from being completely closed. To solve the foregoing problems, referring to Figure 2 As shown, a sealing member 9 that surrounds the orifice of the pressure relief hole 8 and can be fitted to the switching member 3 is provided on the inner wall of the spherical body 1. The sealing member 9 is made of a soft material, such as rubber. A soft seal is formed between the sealing member 9 and the switching member 3 so that the fluid cannot leak through the pressure relief hole 8.

[0020] As a specific embodiment of the improvement, since the seal 9 bulges locally relative to the inner wall of the spherical body 1, the edge of the surface of the switching member 3 facing the inner wall of the spherical body 1 will rub against the seal 9, which not only affects the rotation efficiency of the switching member 3 relative to the spherical body 1, but also exacerbates the wear of the seal 9. To solve the above problems, refer to Figure 3 As shown, chamfer both side edges of the surface of the switching member 3 facing the inner wall of the spherical body 1. The design of relative sliding between the chamfered part and the seal 9 can reduce the wear rate of the seal 9 and ensure the smooth rotation of the switching member 3 at the same time.

[0021] As a specific embodiment of the improvement, refer to Figure 1 and Figure 2 As shown, connection disks 10 with contour dimensions larger than the orifice contour dimensions of the corresponding connecting cylinders 2 are provided at the ends of the two driving members 4 located in the inner cavity of the spherical body 1. Slots for inserting the ends of the switching member 3 can be opened on the connection disks 10, and the connection disks 10 and the ends of the switching member 3 are fixedly connected by welding or bolt fastening. The design of the connection disks 10 can provide a limiting function for the operation of the driving member 4 passing through the connecting cylinder 2, and at the same time can provide stability for the connection operation between the switching member 3 and the driving member 4, and improve the connection operation efficiency between the switching member 3 and the driving member 4.

[0022] The above are only the preferred embodiments of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions falling within the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A V-shaped ball with a pre-pressure relief function, comprising a spherical body (1) capable of forming a hard seal with a valve seat and two coaxial connecting tubes (2) respectively positioned above and below the spherical body (1), wherein both connecting tubes (2) are connected to the inner cavity of the spherical body (1), characterized in that: The valve body (1) further comprises a switching member (3) which is bent and can slide relative to the inner wall of the spherical body (1) and two driving members (4) which are fixedly connected to the two ends of the switching member (3) and are coaxially arranged. The two driving members (4) respectively penetrate the two connecting tubes (2). The outer walls of the two driving members (4) are provided with push blocks (5). The inner walls of the two connecting tubes (2) are provided with a leading groove (6) for accommodating the push blocks (5) and having an arc length greater than the arc length of the push blocks (5). The two driving members (4) are provided with a connecting groove (7) for connecting a valve stem. The spherical body (1) is provided with a pressure relief hole (8) which can be covered by the switching member (3). The driving member (4) drives the switching member (3) to rotate back and forth relative to the spherical body (1) to control whether the pressure relief hole (8) is connected to the inner cavity of the spherical body (1).

2. A V-shaped sphere with pre-pressure relief function according to claim 1, characterized in that: A sealing member (9) is arranged on the inner wall of the spherical body (1) and surrounds the outside of the pressure relief hole (8) and can fit with the switching member (3).

3. A V-shaped sphere with pre-pressure relief function according to claim 2, characterized in that: The edges on both sides of the surface of the switching member (3) facing the inner wall of the spherical body (1) are chamfered.

4. A V-shaped sphere with pre-pressure relief function according to claim 1, 2 or 3, characterized in that: The two driving members (4) are both provided with connection disks (10) at the ends of the inner cavity of the spherical body (1) with outline dimensions larger than the outline dimensions of the corresponding openings of the connection cylinders (2), and the two connection disks (10) are respectively fixedly connected to the two ends of the switching member (3).

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