A ball valve

Abstract

The utility model discloses a ball valve relates to valve technical field, include: ball valve body, the valve core of ball valve body is equipped with the rotation groove that matches with the support shaft of ball valve body, and the support shaft rotation sets up in the rotation groove, and the groove bottom of rotation groove is provided with first permanent magnet, and the one end of support shaft is close to rotation groove and is provided with second permanent magnet corresponding first permanent magnet, and first permanent magnet and second permanent magnet are same pole and are opposite and set, and first permanent magnet and second permanent magnet interval setting, the repulsion of two permanent magnets is used in the utility model, and the force in the direction of the valve core is provided away from the support shaft, to offset the gravity of valve core, can guarantee that two permanent magnets have certain interval, avoid the wear and tear between valve core and support shaft caused by the downward movement of valve core, and the friction force of valve core and valve seat lower half increases, and the problem of aggravating wear and tear, can effectively reduce the wear and tear that valve core and valve seat bear, improve the service life of ball valve.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, and in particular to a ball valve. Background Technology

[0002] Valves are commonly used equipment for controlling the flow of fluid. As a type of valve, the ball valve uses the rotation of a ball-shaped valve core to open and close the fluid passage.

[0003] The structure of a commonly used ball valve is as follows: a spherical valve core is located in the center of the valve body. The upper and lower cylindrical holes of the valve core are respectively fitted with the corresponding cylindrical sections of the valve stem and the support shaft to constrain the translational freedom of the valve core. The valve core is driven by the valve stem and rotates around the valve stem axis. Two valve seats are horizontally symmetrically arranged on both sides of the valve core. The valve seats are pushed towards the valve core under the action of spring force. When the valve is closed, the valve seats are forced to fit against the spherical surface of the valve core under the combined action of spring force and fluid pressure. The two symmetrically arranged valve seats clamp and lift the valve core, so that the horizontal plane of the center of the valve core coincides with the horizontal plane of the flow channel. This is the theoretical state of the design.

[0004] However, in actual products, the center horizontal plane of the valve core cannot completely coincide with the horizontal plane of the flow channel. This is because the valve core will move downwards under its own gravity, causing the lower end of the valve core's inner hole to contact the upper end of the support shaft and generate friction. Moreover, the friction between the lower half of the valve seat sealing surface and the corresponding lower half of the valve core is greater than that between the upper half and the lower half. This results in uneven wear between the valve seat sealing surface and the corresponding valve core sealing surface. As the valve's operating time increases, the wear intensifies, and the valve's sealing performance will decrease until the seal fails, thus affecting the service life of the ball valve.

[0005] Therefore, there is an urgent need for a ball valve that reduces wear and extends service life. Utility Model Content

[0006] The purpose of this invention is to provide a ball valve that solves the problems existing in the prior art. By using two permanent magnets with opposite poles, the influence of the valve core's gravity is counteracted, reducing the wear on the valve core and valve seat, and improving the service life of the ball valve.

[0007] To achieve the above objectives, the present invention provides the following solution: The present invention provides a ball valve, including a ball valve body. The valve core of the ball valve body has a rotating groove that matches the support shaft of the ball valve body. The support shaft is rotatably disposed in the rotating groove. A first permanent magnet is disposed at the bottom of the rotating groove. A second permanent magnet is disposed at one end of the support shaft near the rotating groove, corresponding to the first permanent magnet. The first permanent magnet and the second permanent magnet are disposed opposite each other with the same pole and are spaced apart.

[0008] Preferably, both the first permanent magnet and the second permanent magnet are cylindrical, the diameter of the first permanent magnet matches the inner diameter of the rotating groove, and the diameter of the second permanent magnet matches the diameter of the support shaft.

[0009] Preferably, the support shaft has an assembly groove at one end near the rotating groove, and the second permanent magnet has an assembly block facing the support shaft, the assembly block being embedded in the assembly groove.

[0010] Preferably, the assembly block is integrally formed with the second permanent magnet.

[0011] Preferably, the ball valve body includes a valve body, a valve seat, a valve stem, a valve core, and a support shaft. The valve core is disposed in the valve body, and the valve stem is pulsatorically connected to the valve core. The valve seat is provided on both the inlet and outlet sides of the valve core. The valve seat is annular, and the inner diameter of the valve seat is smaller than the diameter of the ball of the valve core. The valve seat abuts against the valve core by a spring.

[0012] Preferably, the end face of the valve seat near the valve core is an arc surface that matches the valve core.

[0013] Preferably, the valve body is provided with a stuffing box, and the stuffing box has a first through hole and a second through hole distributed in a stepped manner in the middle. The first through hole is located on the side of the second through hole closer to the valve body. The inner diameter of the first through hole matches the diameter of the valve stem. The valve stem passes through the first through hole and is drivenly connected to the valve core. The inner diameter of the second through hole is larger than the diameter of the valve stem. An annular packing groove for filling sealing packing is formed between the inner peripheral wall of the second through hole and the outer peripheral wall of the valve stem. A pressure cap is connected to the end of the stuffing box away from the valve body. The pressure cap is sleeved on the valve stem. The pressure cap is provided with an annular extrusion part for extending into the annular packing groove.

[0014] Preferably, the valve stem is drivenly connected to the valve core key.

[0015] Preferably, both ends of the valve body are provided with flanges for connecting fluid pipelines.

[0016] Preferably, a sealing ring is provided between the outer peripheral wall of the valve seat and the valve body.

[0017] The present invention achieves the following main technical effects compared to the prior art:

[0018] A first permanent magnet and a second permanent magnet with the same poles facing each other are set between the valve core and the support shaft. The repulsive force generated by the two permanent magnets provides a force to the valve core away from the support shaft to counteract the weight of the valve core. This ensures that there is a certain gap between the two permanent magnets, avoiding the wear between the valve core and the support shaft caused by the downward movement of the valve core, as well as the problem of increased friction between the valve core and the lower half of the valve seat, which leads to accelerated wear. This can effectively reduce the wear on the valve core and the valve seat and improve the service life of the ball valve. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the ball valve in an embodiment of the present invention;

[0021] Figure 2 This is a cross-sectional view of the ball valve in an embodiment of this utility model;

[0022] Figure 3 for Figure 2 Enlarged view of the structure at point A in the middle;

[0023] Among them, 1. flange; 2. valve seat; 3. valve body; 4. support shaft; 5. first permanent magnet; 6. second permanent magnet; 7. valve core; 8. sealing ring; 9. spring; 10. flat key; 11. stuffing box; 12. valve stem; 13. sealing packing; 14. gland; 15. assembly block; 16. annular extrusion section. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] The purpose of this invention is to provide a ball valve that solves the problems existing in the prior art. By using two permanent magnets with opposite poles, the influence of the valve core's gravity is counteracted, reducing the wear on the valve core and valve seat, and improving the service life of the ball valve.

[0026] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] Please refer to the following: Figures 1-3 As shown, a ball valve is provided. The ball valve body has a valve core 7 with a rotating groove that matches the support shaft 4 of the ball valve body. The support shaft 4 is rotatably disposed in the rotating groove. A first permanent magnet 5 is disposed at the bottom of the rotating groove. A second permanent magnet 6 is disposed at one end of the support shaft 4 near the rotating groove, corresponding to the first permanent magnet 5. The first permanent magnet 5 and the second permanent magnet 6 are disposed opposite each other with the same pole and are spaced apart.

[0028] The first permanent magnet 5 and the rotating groove can be set up in a way that allows for direct placement, glue connection, bolt connection, etc. That is, the first permanent magnet 5 and the second permanent magnet 6 can be placed movably in a designated position, or they can be fixedly connected in a designated position by glue, bolts, etc. When placed directly, the two permanent magnets will be positioned in their respective positions due to the repulsive force between them.

[0029] The specific principle of this device is as follows: When the first permanent magnet 5 and the second permanent magnet 6 are arranged with the same poles facing each other, they will generate a repulsive force. The formula for calculating the repulsive force is as follows:

[0030] F=K×(m1×m2) / r 2

[0031] Where F is the repulsive force between the two permanent magnets, K is a constant, m1 and m2 are the magnetic moments of the two permanent magnets, and r is the distance between the two permanent magnets.

[0032] From the above equation, it can be seen that the repulsive force between two permanent magnets is directly proportional to the magnetic moment of the permanent magnets and inversely proportional to the square of the distance r between the opposing surfaces of the two permanent magnets. The smaller the distance r, the greater the repulsive force. Theoretically, when r approaches zero, the repulsive force is infinite, that is:

[0033] When r→0: theoretically F→∞, that is, the repulsive force tends to infinity.

[0034] Even though in reality, due to factors such as the physical structure, material strength, and quantum effects of permanent magnets, the actual repulsive force that can be achieved is limited and will not truly be infinite, experiments have shown that two 1cm magnets... 3 The N52 neodymium magnet has a repulsive force of about several hundred Newtons when the surface spacing is 0.1mm. When the spacing approaches 0, the repulsive force can reach several thousand Newtons, but it cannot be increased indefinitely due to material limitations. It can be seen that such a strong repulsive force is enough to resist the downward gravity of the valve core 7.

[0035] When the valve is equipped with two permanent magnets, the valve core 7 moves downward under the action of gravity. As the distance r between the two permanent magnets decreases, the repulsive force also increases. When the repulsive force is equal to the gravity of the valve core 7 moving downward, the gravity of the valve core 7 moving downward and the repulsive force reach a balance. The valve core 7 no longer moves downward. The repulsive force cancels out the gravity of the valve core 7, which can ensure that there is a certain gap between the two permanent magnets. This avoids the wear between the valve core 7 and the support shaft 4 caused by the downward movement of the valve core 7, as well as the problem of increased friction between the valve core 7 and the lower half of the valve seat 2, which leads to accelerated wear. It can effectively reduce the wear on the valve core 7 and the valve seat 2 and improve the service life of the ball valve.

[0036] In this embodiment, both the first permanent magnet 5 and the second permanent magnet 6 are cylindrical. The diameter of the first permanent magnet 5 matches the inner diameter of the rotating groove, and the diameter of the second permanent magnet 6 matches the diameter of the support shaft 4. Since the rotating groove matches the support shaft 4, the inner circumferential wall of the rotating groove will limit the first permanent magnet 5 and the second permanent magnet 6, thus positioning the two permanent magnets.

[0037] In this embodiment, an assembly groove is provided at one end of the support shaft 4 near the rotating groove, and an assembly block 15 is provided on the second permanent magnet 6 facing the support shaft 4. The assembly block 15 is embedded in the assembly groove, which further improves the stability of the installation position of the second permanent magnet 6.

[0038] The assembly block 15 is integrally set with the second permanent magnet 6 to improve structural strength.

[0039] The specific structure of the ball valve body includes: valve body 3, valve seat 2, valve stem 12, valve core 7, and support shaft 4. The valve core 7 is installed inside the valve body 3, and the valve stem 12 is connected to the valve core 7 in a driving connection. The valve seat 2 is provided on both the inlet and outlet sides of the valve core 7. The valve seat 2 is annular, and the inner diameter of the valve seat 2 is smaller than the diameter of the ball of the valve core 7. An annular step is provided inside the valve body 3 at the position corresponding to the valve seat 2. Multiple springs 9 are evenly distributed around the circumference of the valve seat 2 between the annular step and the valve seat 2. The valve seat 2 is pressed against the valve core 7 by the elastic force of the springs 9 to ensure the sealing effect between the valve seat 2 and the valve core 7.

[0040] The end face of the valve seat 2 near the valve core 7 is an arc surface that matches the valve core 7, so as to increase the contact area and thus improve the sealing effect.

[0041] To prevent fluid from overflowing from the valve stem 12, a stuffing box 11 is provided on the valve body 3. The stuffing box 11 has a first through hole and a second through hole distributed in a stepped manner in the middle. The first through hole is located on the side of the second through hole closer to the valve body 3. The inner diameter of the first through hole matches the diameter of the valve stem 12. The valve stem 12 passes through the first through hole and is connected to the valve core 7. The inner diameter of the second through hole is larger than the diameter of the valve stem 12. An annular packing groove for filling sealing packing 13 is formed between the inner peripheral wall of the second through hole and the outer peripheral wall of the valve stem 12. A pressure cap 14 is connected to the end of the stuffing box 11 away from the valve body 3. The pressure cap 14 is fitted on the valve stem 12. An annular extrusion part 16 is provided on the pressure cap 14 for extending into the annular packing groove. The annular extrusion part 16 extends into the annular packing groove to extrude the sealing packing 13 to achieve a seal.

[0042] The valve stem 12 is connected to the valve core 7 via a key drive. Specifically, a flat key 10 is provided on the valve stem 12, and a keyway is provided in the groove at the top of the valve core 7 that matches the valve stem 12. The flat key 10 is located in the keyway to transmit the movement of the valve stem 12 to the valve core 7.

[0043] Flanges 1 are provided at both ends of the valve body 3 for connecting fluid pipelines.

[0044] A sealing ring 8 is provided between the outer peripheral wall of the valve seat 2 and the valve body 3 to improve the sealing effect. Specifically, an annular groove can be provided on the outer peripheral wall of the valve seat 2 or the inner peripheral wall of the valve body 3, and the annular groove provides an installation base for the sealing ring 8.

[0045] In actual use, the opening and closing of the overall ball valve can be controlled by controlling the rotation of the valve stem 12. During the process of rotating the valve stem 12 to drive the valve core 7 to move, due to the presence of the first permanent magnet 5 and the second permanent magnet 6, there will be no contact friction between the bottom of the rotating groove of the valve core 7 and the support shaft 4. In addition, the repulsive force of the first permanent magnet 5 and the second permanent magnet 6 will also offset the gravity of the valve core 7, thus avoiding large wear between the valve core 7 and the lower half of the valve seat 2.

[0046] Any adaptive changes made according to actual needs are within the protection scope of this utility model.

[0047] It should be noted that, for those skilled in the art, it is obvious that this utility model is not limited to the details of the above exemplary embodiments, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of this utility model is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this utility model. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0048] This utility model uses specific examples to illustrate its principles and implementation methods. The above description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the idea of ​​this utility model. In summary, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A ball valve, characterized in that The device includes a ball valve body. The ball valve body has a valve core with a rotating groove that matches the support shaft of the ball valve body. The support shaft is rotatably disposed in the rotating groove. A first permanent magnet is disposed at the bottom of the rotating groove. A second permanent magnet is disposed at one end of the support shaft near the rotating groove, corresponding to the first permanent magnet. The first permanent magnet and the second permanent magnet are disposed opposite each other with the same pole and are spaced apart.

2. The ball valve according to claim 1, characterized in that Both the first permanent magnet and the second permanent magnet are cylindrical. The diameter of the first permanent magnet matches the inner diameter of the rotating groove, and the diameter of the second permanent magnet matches the diameter of the support shaft.

3. The ball valve of claim 1, wherein An assembly groove is provided at one end of the support shaft near the rotating groove, and an assembly block is provided on the second permanent magnet facing the support shaft, the assembly block being embedded in the assembly groove.

4. The ball valve according to claim 3, characterized in that, The assembly block is integrally formed with the second permanent magnet.

5. The ball valve of claim 1, wherein The ball valve body includes a valve body, a valve seat, a valve stem, a valve core, and a support shaft. The valve core is disposed in the valve body, and the valve stem is pulsatorically connected to the valve core. The valve seat is provided on both the inlet and outlet sides of the valve core. The valve seat is annular, and the inner diameter of the valve seat is smaller than the diameter of the ball of the valve core. The valve seat abuts against the valve core by a spring.

6. The ball valve of claim 5, wherein, The end face of the valve seat near the valve core is an arc surface that matches the valve core.

7. The ball valve of claim 5, wherein The valve body is provided with a stuffing box, and the stuffing box has a first through hole and a second through hole distributed in a stepped manner in the middle. The first through hole is located on the side of the second through hole closer to the valve body. The inner diameter of the first through hole matches the diameter of the valve stem. The valve stem passes through the first through hole and is drivenly connected to the valve core. The inner diameter of the second through hole is larger than the diameter of the valve stem. An annular packing groove for filling sealing packing is formed between the inner peripheral wall of the second through hole and the outer peripheral wall of the valve stem. A pressure cap is connected to the end of the stuffing box away from the valve body. The pressure cap is sleeved on the valve stem. The pressure cap is provided with an annular extrusion part for extending into the annular packing groove.

8. The ball valve of claim 5, wherein, The valve stem is connected to the valve core key via a transmission connection.

9. The ball valve of claim 5, wherein, Both ends of the valve body are equipped with flanges for connecting fluid pipelines.

10. The ball valve of claim 5, wherein, A sealing ring is provided between the outer peripheral wall of the valve seat and the valve body.

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