Ball valve

Abstract

The utility model provides a ball valve which is used for solving the problems that in the prior art, a ball valve sealing piece is prone to displacement, and an opening and closing piece is prone to scratching the sealing piece to cause sealing failure. A ball valve comprises a valve body and a valve rod, the valve body comprises a flow channel and an opening and closing bin, a spherical opening and closing piece is fixed to the end, arranged in the opening and closing bin, of the valve rod, the opening and closing piece comprises a vent hole and abuts against the inner side wall of the opening and closing bin through an upper sealing piece and a lower sealing piece, and a volute rotation stopping groove is formed in the bottom of the opening and closing bin. And the lower sealing piece is clamped with the valve body through the rotation stopping groove. The vortex-shaped rotation stopping groove is formed in the bottom of the valve body to limit the sealing piece, so that the sealing piece is prevented from rotating.

Description

Technical Field

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

[0002] The core components of the ball valve include the opening and closing parts and the seals driven by the valve stem. During the long-term operation of the ball valve, due to the fluctuation of the external environment temperature or the internal medium temperature, the plastic seals will expand and contract due to heat and cold. At the same time, the viscosity of the medium will increase the friction between the seals and the opening and closing parts. In addition, if the switching speed and frequency of the valve stem are too fast, or the switching direction of the valve stem changes, these may cause the contact surface between the seal and the opening and closing parts to rotate relative to each other, thereby causing the through hole of the seal and the left and right through holes of the opening and closing parts to be misaligned or even completely blocked, which seriously affects the flow performance of the ball valve. Therefore, there is an urgent need for a ball valve with a long service life and good sealing effect. Utility Model Content

[0003] The utility model provides a ball valve, which solves the problems in the prior art that the sealing part of the ball valve is prone to displacement and the opening and closing parts are prone to scratch the sealing part, resulting in sealing failure.

[0004] The technical solution of the utility model is achieved in this way:

[0005] A ball valve comprises a valve body and a valve stem. The valve body comprises a flow channel and an opening and closing chamber. A spherical opening and closing member is fixed at one end of the valve stem placed in the opening and closing chamber. The opening and closing member comprises an air vent. The opening and closing member abuts against the inner wall of the opening and closing chamber through an upper seal and a lower seal. The upper seal and the lower seal are provided with a hemispherical sealing surface abutting against the seal on one side close to the opening and closing member. Semicircular notches are provided on both sides of the upper seal and the lower seal. The notches form flow holes corresponding to the flow channel. A rotating hole is provided on the upper seal. A pressure cover is screwed on the top of the valve body. The upper seal abuts against the pressure cover through a gasket. A vortex anti-rotation groove is provided at the bottom of the opening and closing chamber. The lower seal is clamped with the valve body through the anti-rotation groove.

[0006] Furthermore, the flow holes are all provided with support rings, and the side of the support rings close to the opening and closing member is provided with arc-shaped depressions for the opening and closing member to rotate. The support rings are provided with arc-shaped depressions, so that the opening and closing member can rotate smoothly during operation, ensuring the stability and reliability of the valve operation. With the support of the support rings, the seal can maintain the correct shape, thereby ensuring that the flow channel is unobstructed.

[0007] Furthermore, the cross section of the anti-rotation groove is triangular. Since the chips are easily discharged, a higher feed rate can be used for cutting, which can shorten the processing time and improve production efficiency.

[0008] Furthermore, the cross section of the anti-rotation groove is square. The square anti-rotation groove can provide greater friction and resistance for the lower seal, making the lower seal more stable.

[0009] Furthermore, an elastic gasket is provided between the gasket and the gland, and the elastic gasket can continuously apply elastic force to the sealing member through the gasket, and finally the opening and closing member is tightly held through the sealing member to ensure the normal operation of the valve.

[0010] Furthermore, the lower seal is provided with a positioning hole coaxial with the rotating hole, and a positioning column is fixed to the bottom of the opening and closing member, and the positioning column is placed in the positioning hole. Since the positioning hole and the positioning column help maintain the correct position of the seal, excessive wear of the seal caused by misalignment is reduced, and the service life of the valve is extended. Beneficial Effects

[0011] The utility model sets a spiral anti-rotation groove at the bottom of the valve body to limit the seal and prevent the seal from rotating. The hemispherical sealing surface helps to disperse the contact pressure, reduce the friction and wear during the opening and closing operation, and extend the service life of the valve. The support ring set between the upper seal and the lower seal can prevent relative rotation between the upper seal and the lower seal, ensuring the stability and reliability of the valve operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] 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.

[0013] Figure 1 It is a three-dimensional cross-sectional view of the utility model;

[0014] Figure 2 This is a three-dimensional exploded view of the opening and closing chamber of the utility model;

[0015] Figure 3 It is a top view of the valve body of the utility model;

[0016] Figure 4 It is a three-dimensional cross-sectional view when the cross section of the anti-rotation groove of the utility model is a triangle;

[0017] Figure 5 It is a three-dimensional cross-sectional view when the cross section of the anti-rotation groove of the utility model is a square.

[0018] Among them: 1. valve body, 2. valve stem, 3. flow channel, 4. opening and closing chamber, 5. opening and closing parts, 6. vent hole, 7. upper seal, 8. lower seal, 9. sealing surface, 10. notch, 11. rotating hole, 12. pressure cover, 13. anti-rotation groove, 16. support ring, 17. elastic gasket, 18. positioning hole, 19. positioning column. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in 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.

[0020] like Figure 1-5 As shown, an embodiment of the utility model provides a ball valve, including a valve body 1 and a valve stem 2, the valve body 1 includes a flow channel 3 and an opening and closing chamber 4, a spherical opening and closing member 5 is fixed at one end of the valve stem 2 placed in the opening and closing chamber 4, the opening and closing member 5 includes a vent 6, the opening and closing member 5 is abutted against the inner wall of the opening and closing chamber 4 through an upper seal 7 and a lower seal 8, the upper seal 7 and the lower seal 8 are close to the opening and closing member 5. A hemispherical sealing surface 9 that abuts against the seal is provided on one side, and a semicircular notch 10 is provided on both sides of the upper seal 7 and the lower seal 8. The notch 10 forms a flow hole corresponding to the flow channel 3, and a rotating hole 11 is provided on the upper seal 7. A pressure cover 12 is screwed on the top of the valve body 1, and the upper seal 7 abuts against the pressure cover 12 through a gasket. A vortex anti-rotation groove 13 is provided at the bottom of the opening and closing chamber 4, and the lower seal 8 is clamped with the valve body 1 through the anti-rotation groove 13.

[0021] During the installation process, the valve stem 2 is inserted into the rotating hole 11, so that the opening and closing member 5 is placed in the concave surface of the upper seal 7 and the lower seal 8, and the upper seal 7, the lower seal 8 and the opening and closing member 5 are placed together in the opening and closing chamber 4, and the flow hole and the flow channel 3 are connected. The upper seal 7 and the lower seal 8 are made of plastic material with elastic deformation. Pressure is applied to the upper seal 7 and the lower seal 8 through the pressure cover 12, so that the bottom surface of the lower seal 8 is deformed and filled in the volute groove. The asymmetric shape of the volute groove contacts the bottom surface of the lower seal 8, and causes greater resistance and friction at the edge of the object in contact with the groove. The volute groove can also absorb the stress generated during the installation process to a certain extent, reducing the risk of damage to the seal due to uneven force, and further enhancing the durability and service life of the ball valve. Through the pressure cover 12 and the gasket, a stable pressure can be applied to the upper seal 7 to ensure that the valve maintains good sealing performance during long-term use.

[0022] like Figure 1-2As shown, the flow holes are all provided with support rings 16, and the side of the support rings 16 close to the opening and closing member 5 is provided with an arc-shaped depression for the opening and closing member 5 to rotate. The support rings 16 can be made of hard materials such as metal or hard plastic. The support rings 16 can prevent the upper seal 7 and the lower seal 8 from rotating relative to each other, and the support rings 16 can support the upper seal 7 and the lower seal 8 to prevent them from deforming and blocking the flow channel 3. The support rings 16 can effectively resist the deformation force from the fluid pressure and maintain the structural integrity of the upper seal 7 and the lower seal 8. In addition, the arc-shaped depression provided on the support ring 16 not only provides space for the rotation of the opening and closing member 5, but also reduces the opening and closing torque, making the operation of the ball valve more convenient and flexible.

[0023] like Figure 4 As shown, the cross section of the anti-rotation groove 13 is triangular. During the processing, the triangular anti-rotation groove 13 can more effectively guide the chip discharge and avoid chip blockage due to its sharp angles and inclined surfaces, which is very helpful for improving processing efficiency and maintaining processing quality. The structure of the triangular anti-rotation groove 13 also helps to form a tighter and more uniform contact surface when the seal is installed in the anti-rotation groove 13, thereby achieving the effect of improving the sealing performance of the ball valve.

[0024] like Figure 5 As shown, the cross section of the anti-rotation groove 13 is square. The right-angled edge of the square anti-rotation groove 13 makes the contact area between the bottom surface of the lower seal 8 and the anti-rotation groove 13 larger, ensuring a more stable and reliable clamping, so that the seal is not easy to deviate, rotate or shake during operation, thereby improving the sealing performance of the ball valve. The cross section of the anti-rotation groove 13 can also be an arc shape, etc., as long as it can ensure that the lower seal 8 can be filled into the anti-rotation groove 31 after being pressed and the rotation of the lower seal 8 can be limited.

[0025] like Figure 1 As shown, an elastic gasket 17 is provided between the gasket and the gland 12. The elastic gasket 17 can compensate for the deformation of the upper seal 7 and the lower seal 8 caused by pressure fluctuations or temperature changes within the working temperature range of the valve, and maintain the stability of the sealing performance. Since the elastic gasket 17 has excellent elasticity and resilience, it can deform when subjected to pressure, so that the upper seal 7 and the lower seal 8 can fit tightly with the opening and closing member 5, effectively preventing leakage of the medium, and can also enable the ball valve to maintain a stable sealing effect under harsh working environments such as high pressure or high temperature.

[0026] like Figure 1-2As shown, the lower seal 8 is provided with a positioning hole 18 coaxial with the rotating hole 11, and a positioning column 19 is fixed to the bottom of the opening and closing member 5, and the positioning column 19 is placed in the positioning hole 18. The cooperation of the positioning hole 18 and the positioning column 19 provides further positioning for the valve stem 2, ensures the precise control and stability of the opening and closing member 5 during operation, and reduces the uneven force and wear caused by the offset of the opening and closing member 5. In addition, the shapes of the upper seal 7 and the lower seal 8 can be unified, simplifying the design and manufacturing process of the seal, reducing the complexity of design and production, and also facilitating replacement and assembly during maintenance.

[0027] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A ball valve, comprising a valve body (1) and a valve stem (2), wherein the valve body (1) comprises a flow channel (3) and an opening and closing chamber (4), and a spherical opening and closing member (5) is fixed to one end of the valve stem (2) disposed in the opening and closing chamber (4), wherein the opening and closing member (5) comprises a vent hole (6), characterized in that: The opening and closing member (5) is abutted against the inner side wall of the opening and closing chamber (4) through an upper sealing member (7) and a lower sealing member (8); a hemispherical sealing surface (9) is provided on the side of the upper sealing member (7) and the lower sealing member (8) close to the opening and closing member (5); the sealing surface (9) abuts against the opening and closing member (5); a semicircular notch (10) is provided on both sides of the upper sealing member (7) and the lower sealing member (8); the notches (10) of the upper sealing member (7) and the lower sealing member (8) are connected to form a flow hole corresponding to the flow channel (3); a rotating hole (11) is provided on the upper sealing member (7); a pressure cover (12) is screwed on the top of the valve body (1); the upper sealing member (7) abuts against the pressure cover (12) through a gasket; a vortex anti-rotation groove (13) is provided at the bottom of the opening and closing chamber (4); and the lower sealing member (8) is clamped with the valve body (1) through the anti-rotation groove (13).

2. A ball valve according to claim 1, characterized in that: A support ring (16) is provided at each of the flow holes, and an arc-shaped recess for the opening and closing member (5) to rotate is provided on one side of the support ring (16) close to the opening and closing member (5).

3. A ball valve according to claim 1, characterized in that: The anti-rotation groove (13) has a triangular cross-section.

4. A ball valve according to claim 1, characterized in that: The cross section of the anti-rotation groove (13) is square.

5. A ball valve according to claim 1, characterized in that: An elastic gasket (17) is provided between the gasket and the gland (12).

6. A ball valve according to claim 1, characterized in that: The lower sealing member (8) is provided with a positioning hole (18) coaxial with the rotating hole (11), and a positioning column (19) is fixed to the bottom of the opening and closing member (5), and the positioning column (19) is placed in the positioning hole (18).

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