Anti-seizure ceramic hard seal floating ball valve seat structure

Abstract

The utility model discloses a valve seat structure of an anti-stuck ceramic hard-sealed floating ball valve, comprising a valve body with a fluid channel, a valve seat arranged in the valve body, and a ball core rotatably mounted on the valve seat, wherein the valve seat and the ball core are in contact with each other to form a hard seal, and the side and end of the valve seat in the valve body are respectively provided with a first mating surface and a second mating surface, and the first mating surface and the second mating surface are respectively provided with a first groove and a second groove for forming a radial and axial seal with the corresponding valve seat, and a sealing ring is arranged in the first groove and the second groove, and the sealing ring protrudes from the first groove and the second groove to form an abutment with the valve seat; the valve seat forms a floating gap between the sealing ring and the first mating surface and the second mating surface. This scheme can reduce the precision requirements for hard seal production, promote production efficiency, reduce production costs, reduce the defective rate, and can alleviate the problem of brittle cracking of the ceramic valve seat due to water hammer or external force impact.

Description

Technical Field

[0001] The utility model relates to a valve, in particular to an anti-stuck ceramic hard-sealed floating ball valve seat structure. Background Art

[0002] Ceramic hard-sealed ball valves are based on the characteristics of high hardness, wear resistance, corrosion resistance and low friction of ceramics. Their service life is 2-4 times that of titanium alloy valves and monel valves. They are widely used in petroleum, chemical, water treatment and other fields.

[0003] Ceramic hard-sealed ball valves mostly adopt a floating ball structure. Both the ball and the valve seat are made of engineering ceramics. The elastic modulus and hardness of ceramic materials are very high. The characteristics of extremely small deformation under force require that the size and shape and position tolerance grade of the ball and valve seat are very high to ensure that the ball valve opens and closes with low torque and without jamming.

[0004] The "brittleness" and difficulty in processing of ceramics themselves limit the processing accuracy and mass production. In order to reduce the precision requirements of ceramic hard-sealed ball valves, the existing technology usually designs the assembly of the ball, valve seat and valve body to have a suitable clearance fit. When the ball rotates, the ball and valve seat are in a floating state to compensate for the low precision of dimensional and geometric tolerances.

[0005] In applications with fluid media containing impurities, such as in the transportation of water media containing silt impurities, silt impurities smaller than the clearance between the valve seat and the valve body can easily enter the valve seat, causing the valve seat to fail to float and become stuck, which in turn causes the ball to become blocked or even stuck.

[0006] Ceramics are hard and brittle materials, and are prone to brittle fracture failure when subjected to water hammer or external force impact. Utility Model Content

[0007] In view of the shortcomings of the prior art, the purpose of the utility model is to provide an anti-sticking ceramic hard-seal floating ball valve seat structure, which can reduce the precision requirements for hard seal production, promote production efficiency, reduce production costs, reduce the defective rate, and alleviate the problem of brittle cracking of ceramic valve seats caused by water hammer or external force impact.

[0008] To achieve the above-mentioned objectives, the utility model provides the following technical solutions: a valve seat structure of an anti-sticking ceramic hard-seal floating ball valve, comprising a valve body with a fluid channel, a valve seat arranged in the valve body, and a ball core rotatably mounted on the valve seat, wherein the valve seat and the ball core abut against each other to form a hard seal, and the side and end of the valve seat in the valve body respectively have a first mating surface and a second mating surface, and the first mating surface and the second mating surface are respectively provided with a first groove and a second groove for forming a radial and axial seal with the corresponding valve seat, and sealing rings are provided in the first groove and the second groove, and the part of the sealing ring protruding from the first groove and the second groove cooperates with the valve seat to form an abutment; the valve seat forms a floating gap through the sealing ring and the first mating surface and the second mating surface.

[0009] As a further improvement of the present invention, there is a distance difference between the positions on the first matching surface corresponding to both sides of the first groove and the valve seat, and the distance between the side corresponding to the fluid and the valve seat is larger; and

[0010] There is a distance difference between the positions on the second matching surface corresponding to the two sides of the second groove and the valve seat, and the distance between the side corresponding to the fluid and the valve seat is larger.

[0011] As a further improvement of the present invention, a first chamfer is provided on one side edge of the first mating surface and / or the second mating surface corresponding to the fluid, so as to cooperate with the valve seat to float and squeeze out impurities.

[0012] As a further improvement of the present invention, a second chamfer is provided on one side of the notch of the first groove and / or the second groove corresponding to the fluid.

[0013] As a further improvement of the present invention, a third chamfer is provided on the side edge of the valve seat corresponding to the side with a larger distance from the first mating surface; and\or,

[0014] A third chamfer is provided at the end of the valve seat and at a side edge corresponding to a side with a greater distance from the second matching surface.

[0015] As a further improvement of the utility model, the position of the valve seat corresponding to the ball core is set to an arc surface, and the arc surface is matched with the surface of the ball core.

[0016] The beneficial effect of the utility model is that in this scheme, the gap between the valve seat and the first mating surface and the second mating surface is supported by the elasticity and sealing effect of the sealing ring, and the sealing effect is maintained at the same time, which can protect the floating gap from impurities and sand and gravel, alleviate the problem of the ball core being stuck and scratches affecting the sealing. At the same time, the sealing ring is used to alleviate the problem of brittle cracking of the ceramic valve seat caused by water hammer or external force impact, and has a more stable floating space. Due to the existence of the floating space, the precision requirements on the hard sealing structure can be reduced, which can improve production efficiency, reduce costs, and alleviate the problem of defective rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the ball valve seat structure of the utility model;

[0018] Figure 2 for Figure 1 A magnified schematic diagram of part A in FIG.

[0019] Figure numbers: 1. valve body; 11. fluid channel; 12. first mating surface; 121. first groove; 13. second mating surface; 131. second groove; 2. valve seat; 21. arc surface; 3. ball core; 4. first chamfer; 5. second chamfer; 6. third chamfer; 7. sealing ring. DETAILED DESCRIPTION

[0020] The present invention will be further described below with reference to the embodiments shown in the accompanying drawings.

[0021] Reference Figure 1-2 As shown,

[0022] A valve seat structure of an anti-stuck ceramic hard-sealed floating ball valve comprises a valve body 1 having a fluid passage 11, a valve seat 2 arranged in the valve body 1, and a ball core 3 rotatably mounted on the valve seat 2, wherein the valve seat 2 and the ball core 3 are in contact with each other to form a hard seal, and the side and end of the valve seat 2 in the valve body 1 are respectively provided with a first mating surface 12 and a second mating surface 13, and the first mating surface 12 and the second mating surface 13 are respectively provided with a first groove 121 and a second groove 131 for forming a radial and axial seal with the corresponding valve seat 2, and a sealing ring 7 is provided in each of the first groove 121 and the second groove 131, and the part of the sealing ring 7 protruding from the first groove 121 and the second groove 131 is in contact with the valve seat 2; the valve seat 2 forms a floating gap with the first mating surface 12 and the second mating surface 13 through the sealing ring 7. The valve seat 2 and the ball core 3 are made of ceramic material, and are matched to form a ceramic hard seal.

[0023] In this solution, the first groove 121 and the second groove 131 are used to make the installation of the sealing ring 7 more stable. And through the gap between the first mating surface 12, the second mating surface 13 and the valve seat 2, and by using the elasticity and sealing effect of the sealing ring 7 to support the gap between the valve seat 2 and the first mating surface 12 and the second mating surface 13, while maintaining the sealing effect, it can protect the floating gap from impurities and sand, avoid getting stuck in the ball core and scratching the ball core, and have a more stable floating space. Due to the existence of the floating space, the precision requirements for the hard sealing structure can be reduced, which can also improve production efficiency, reduce costs, and alleviate the problem of defective rate. And the floating space formed by the elasticity of the sealing ring 7 can be used to form an impact buffer.

[0024] Since it can block impurities and gravel, it can alleviate the problem of impurities and gravel causing the ball core 3 to get stuck and the floating failure, and it can also alleviate the problem of the ball core 3 and the valve seat 2 being scratched and causing the hard sealing effect to weaken. In addition, the elastic force of the sealing ring 7 is used for floating support, which can also alleviate the problem of brittle cracking of the ball core 3 and the valve seat 2 caused by water hammer and external force impact.

[0025] In order to further reduce the impact of impurity sand and gravel on floating, the following methods can also be adopted:

[0026] There is a distance difference between the positions on the first matching surface 12 corresponding to both sides of the first groove 121 and the valve seat 2, and the distance between the side corresponding to the fluid and the valve seat 2 is larger; and

[0027] There is a distance difference between the positions on the second matching surface 13 corresponding to the two sides of the second groove 131 and the valve seat 2 , and the distance between the side corresponding to the fluid and the valve seat 2 is larger.

[0028] The impurity sand and gravel are brought from the fluid, so the first mating surface 12 and the second mating surface 13 increase the distance between the side corresponding to the fluid and the valve seat 2, which can avoid the jam of sand and gravel and affect the floating of the valve seat 2. First of all, the floating gap of the valve seat 2 is not the larger the better. If sand and gravel are stuck in a smaller floating gap, it will cause floating failure. In this solution, by maintaining a smaller floating gap and using the sealing ring 7 to seal and provide elastic force, the impurity sand and gravel will not affect the floating gap. The larger gap corresponds to the position of the fluid, and even if sand and gravel enter, it will not affect the floating effect. During floating, the accumulated sand and gravel can be squeezed out to be discharged and taken away with the fluid. Moreover, the accumulated sand and gravel will be squeezed out instead of stuck under the squeezing action, so it has an anti-sticking effect. Under this structure, the positions of the first groove 121 and the second groove 131 can be relatively set in the inner position, and can have a certain distance from the fluid (that is, the first groove 121 and the second groove 131 are on the corresponding first mating surfaces 12 and the second mating surfaces 13, and the distance between the first mating surfaces 12 and the second mating surfaces 13 and the valve seat 2 is very small as the floating gap and the space sealed by the sealing ring 7, and the first groove 121 and the second groove 131 have a certain distance from the water channel 11, and it is difficult for the fluid to cause a high-speed scouring of the sealing ring 7 during the flow process), avoiding fluid scouring from affecting the service life of the sealing ring 7.

[0029] As an implementation scheme that allows the accumulated impurities and gravel to be discharged more easily, a first chamfer 4 is provided on one side edge of the first mating surface 12 and / or the second mating surface 13 corresponding to the fluid, which is used to cooperate with the valve seat 2 to float and squeeze out impurities.

[0030] The setting of the first chamfer 4 can reduce the space for the accumulation of impurities and gravel, making it easier for the fluid to carry away the gravel and gravel, increasing the difficulty of forming accumulation. At the same time, the gravel squeezed out when the valve seat 2 floats can also be more easily carried away by the fluid.

[0031] In addition, when the valve seat 2 floats, the deformation of the sealing ring 7 can push the accumulated sand and gravel, thereby achieving a better sand and gravel discharge effect.

[0032] Based on the effect of deformation of the sealing ring 7 pushing the sand and gravel, the following optimization can also be made: a second chamfer 5 is provided on one side of the notch of the first groove 121 and / or the second groove 131 corresponding to the fluid.

[0033] The second chamfer 5 can not only make it easier to push out sand and gravel when the sealing ring 7 is deformed, but also protect the sealing ring 7 to avoid the sealing ring 7 being cut due to extrusion.

[0034] As an optional solution:

[0035] A third chamfer 6 is provided on the side of the valve seat 2 and on the edge of the side which is at a greater distance from the first mating surface 12; and\or,

[0036] A third chamfer 6 is provided at the end of the valve seat 2 and corresponds to an edge of a side which is farther away from the second matching surface 13 .

[0037] The third chamfer 6 can make it more difficult for sand and gravel to accumulate, but those skilled in the art need to avoid the problem that running water scours the sealing ring and affects the service life of the sealing ring.

[0038] Reference Figure 2 As shown in , in this solution, the position corresponding to the first mating surface 12 has the second chamfer 5 and the third chamfer 6; the position corresponding to the second mating surface 13 has the first chamfer 4 and the second chamfer 5. This arrangement can protect the sealing ring 7 and reduce the problem of accumulation.

[0039] In order to make the sealing and floating fit between the ball core 3 and the valve seat 2 more stable, the position of the valve seat 2 corresponding to the ball core 3 is set to an arc surface, and the arc surface is matched with the surface of the ball core 3.

[0040] The fitting of the arc surface can increase the sealing effect, and at the same time make the two fit more closely when floating, and have a good fit in both longitudinal and horizontal floating.

[0041] The above is only a preferred embodiment of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. An anti-seizure ceramic hard-sealed floating ball valve seat structure, comprising a valve body with a fluid channel, a valve seat arranged in the valve body, and a ball core rotatably mounted on the valve seat, wherein the valve seat and the ball core are in contact with each other to form a hard seal, and characterized in that: The side surface and the end portion of the corresponding valve seat in the valve body respectively have a first mating surface and a second mating surface, and the first mating surface and the second mating surface are respectively provided with a first groove and a second groove for forming a radial and axial seal with the corresponding valve seat, and sealing rings are provided in the first groove and the second groove, and the sealing ring protrudes from the first groove and the second groove to form abutment with the valve seat; a floating gap is formed between the valve seat and the first mating surface and the second mating surface through the sealing ring.

2. The anti-seizure ceramic hard-seal floating ball valve seat structure according to claim 1, characterized in that: There is a distance difference between the positions on the first matching surface corresponding to both sides of the first groove and the valve seat, and the distance between the side corresponding to the fluid and the valve seat is larger; and There is a distance difference between the positions on the second matching surface corresponding to the two sides of the second groove and the valve seat, and the distance between the side corresponding to the fluid and the valve seat is larger.

3. The anti-seizure ceramic hard-sealed floating ball valve seat structure according to claim 2 is characterized in that: The first mating surface and / or the second mating surface is provided with a first chamfered corner on one side edge corresponding to the fluid, so as to cooperate with the valve seat to float and squeeze out impurities.

4. The anti-seizure ceramic hard-seal floating ball valve seat structure according to claim 3 is characterized in that: A second chamfer is provided on one side of the notch of the first groove and / or the second groove corresponding to the fluid.

5. The anti-seizure ceramic hard-seal floating ball valve seat structure according to claim 4 is characterized in that: A third chamfer is provided on the side of the valve seat and on the edge of the side corresponding to the side with a larger distance from the first mating surface; and\or, A third chamfer is provided at the end of the valve seat and at a side edge corresponding to a side with a greater distance from the second matching surface.

6. The anti-seizure ceramic hard-sealed floating ball valve seat structure according to claim 1 or 2 or 3 or 4 or 5, characterized in that: The position of the valve seat corresponding to the ball core is set as a curved surface, and the curved surface is matched with the surface of the ball core.

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