Buffer protection ceramic ball valve

Abstract

The utility model relates to the technical field of ball valves, and provides a buffering protection ceramic ball valve which comprises a valve body, a valve rod, a ceramic ball body and a ceramic valve seat are installed in the valve body, a first ceramic lining is arranged on the side wall of a flow channel of the valve body, and a second ceramic lining is arranged on the side wall of a valve cavity, where the ceramic ball body is installed, of the valve body. And first flexible buffer layers are arranged between the valve main body and the second ceramic lining as well as between the valve main body and the ceramic valve seat. The utility model can play a role in buffering protection, and avoid damage caused by hard extrusion between the ceramic bushing and the valve main body when the pressure of the runner is suddenly increased.

Description

Technical Field

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

[0002] With the increase of equipment pressure and production capacity, there are more and more requirements for bidirectional sealing and product purity in the process of conveying solid particles. Ordinary metal-sealed wear-resistant ball valves can no longer meet the requirements of wear resistance, corrosion resistance, rubber and metal prohibition. At this time, non-metallic ceramic valves with natural advantages are widely used.

[0003] Taking the ball valve as an example, in the prior art (such as patent documents such as "CN220581732U" and "CN113847446A"), the valve body in the ceramic ball valve is usually made of metal. The valve body is composed of a ceramic valve seat, a ceramic sphere and a ceramic bushing. The ceramic bushing is in direct hard contact with the valve body. When the flow channel pressure suddenly increases (especially under pneumatic conditions), the ceramic bushing is easily damaged due to squeezing with the valve body. Utility Model Content

[0004] The utility model aims to provide a buffer protection ceramic ball valve to solve the above-mentioned defects of the prior art.

[0005] The embodiments of the present invention are implemented by the following technical solutions:

[0006] A buffer protection ceramic ball valve comprises a valve body, in which a valve stem, a ceramic sphere and a ceramic valve seat are installed, a first ceramic bushing is provided on the flow channel side wall of the valve body, a second ceramic bushing is provided on the valve cavity side wall where the ceramic sphere is installed, and a first flexible buffer layer is provided between the valve body and the first ceramic bushing, between the valve body and the second ceramic bushing, and between the valve body and the ceramic valve seat.

[0007] Optionally, the first ceramic bushing is integrally formed with the ceramic valve seat.

[0008] Optionally, a pre-tightening assembly is provided between the ceramic valve seat and the valve body, and the pre-tightening assembly includes a spring seat, a pre-tightening spring, a packing pressure ring and a sealing packing which are arranged in sequence, wherein the spring seat contacts the ceramic valve seat, and the sealing packing contacts the valve body.

[0009] Optionally, a first sealing ring is provided between the first ceramic bushing and the valve body, and a second sealing ring is provided between the ceramic valve seat and the valve body.

[0010] Optionally, a groove is provided at the inner end of the valve stem, and a protrusion matching the groove is provided on the ceramic sphere.

[0011] Optionally, a second flexible buffer layer is provided between the protrusion and the groove.

[0012] Optionally, a ceramic ring is provided on the end face of the flow channel opening of the valve body.

[0013] Optionally, a third flexible buffer layer is provided between the ceramic ring and the valve body.

[0014] Optionally, a third sealing ring is provided between the end surface of the ceramic ring and the valve body.

[0015] Optionally, the surface of the valve stem is provided with a corrosion-resistant coating.

[0016] The technical solution of the present utility model has at least the following advantages and beneficial effects: in the present utility model, a first flexible buffer layer is provided between the valve body and the first ceramic bushing, between the valve body and the second ceramic bushing, and between the valve body and the ceramic valve seat. The first flexible buffer layer can play a buffering and protective role to prevent the ceramic bushing and the valve body from being damaged due to hard squeezing when the flow channel pressure suddenly increases. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 A schematic diagram of the structure of a buffer protection ceramic ball valve provided by the utility model;

[0019] Figure 2 for Figure 1 A magnified image of point A;

[0020] Figure 3 It is a schematic diagram of the connection structure between the valve stem and the ball;

[0021] Icon: 1-valve body, 101-valve body, 102-left body, 2-valve stem, 201-groove, 3-ceramic sphere, 301-protrusion, 4-ceramic valve seat, 5-first ceramic bushing, 6-second ceramic bushing, 7-first flexible buffer layer, 8-preload assembly, 801-spring seat, 802-preload spring, 803-packing pressure ring, 804-sealing packing, 9-first sealing ring, 10-second sealing ring, 11-second flexible buffer layer, 12-ceramic ring, 13-third flexible buffer layer, 14-third sealing ring. DETAILED DESCRIPTION

[0022] refer to Figure 1-2A buffer protection ceramic ball valve includes a valve body 1, the valve body 1 includes a valve body 101 and a left body 102, the valve body 101 and the left body 102 are connected by bolts to form the valve body 1, and the valve body 1 is equipped with a valve stem 2, a ceramic ball 3 and a ceramic valve seat 4.

[0023] A first ceramic bushing 5 is provided on the side wall of the flow channel of the valve body 1, a second ceramic bushing 6 is provided on the side wall of the valve cavity on which the ceramic sphere 3 is installed, and a first flexible buffer layer 7 is provided between the valve body 1 and the first ceramic bushing 5, between the valve body 1 and the second ceramic bushing 6, and between the valve body 1 and the ceramic valve seat 4. The first flexible buffer layer 7 can play a buffering and protective role to prevent the ceramic bushing and the valve body 1 from being damaged due to hard squeezing when the flow channel pressure suddenly increases.

[0024] In addition, it is worth mentioning that in traditional ceramic ball valves, a gap connection is generally used between the ceramic bushing and the valve body 1, and an O-ring is used for sealing compensation, which makes it difficult to achieve no metal contamination. The provision of the first flexible buffer layer 7 of the present application can also prevent metal contamination of the valve body 1.

[0025] In practical applications, the first flexible buffer layer 7 is sintered on the inner wall of the valve body 1 , and its specific material is not limited, for example, PTFE, PCTFE, FEP and other materials can be selected.

[0026] In this embodiment, the first ceramic bushing 5 and the ceramic valve seat 4 are integrally formed, that is, the two are sintered into one part. Such a design avoids flow gaps, that is, avoids gaps between the first ceramic bushing 5 and the ceramic valve seat 4. In this way, fluid turbulence caused by the gaps is avoided, and metal contamination at the gaps is also prevented, thereby improving the purity of product delivery.

[0027] The end face of the flow channel of the valve body 1 is provided with a ceramic ring 12, which is used to seal with the flange end face when connecting the pipeline, and can also play a role in erosion resistance. A third sealing ring 14 is provided between the end face of the ceramic ring 12 and the valve body 1 to ensure the end face sealing. Furthermore, a third flexible buffer layer 13 is provided between the ceramic ring 12 and the valve body 1. Similarly, the third flexible buffer layer 13, like the first flexible buffer layer 7, is sintered on the contact surface of the valve body 1 contacting the ceramic ring 12, and provides buffer protection for the ceramic ring 12.

[0028] The valve stem 2 is made of metal and has a corrosion-resistant coating on its surface. The corrosion-resistant coating can reduce the risk of metal contamination of the valve stem 2. There is no limitation on the specific material, such as PTFE, PCTFE, FEP, etc.

[0029] It is worth noting that, due to the high brittleness of the ceramic ball 3, a concave surface is usually provided on the ceramic ball 3 in a conventional ceramic ball valve, and a protrusion is provided on the valve stem 2 to match the concave surface. This structure has a large torque at the moment of the ball valve opening and closing, and the ceramic ball 3 is easy to collapse. To this end, the utility model has made the following improvements, specifically, referring to Figure 3 In this embodiment, the inner end of the valve stem 2 is provided with a groove 201, and the ceramic sphere 3 is provided with a protrusion 301 that matches the groove 201. The protrusion 301 is integrally formed with the ceramic sphere 3. Such a design increases the covering area of ​​the connection between the ceramic sphere 3 and the valve stem 2, helps to provide the ceramic sphere 3 with anti-torque ability, and effectively prevents the ceramic sphere 3 from cracking. It should be understood that in order to transmit torque, the protrusion 301 should not be cylindrical, and can be designed to be rectangular in actual applications.

[0030] Furthermore, a second flexible buffer layer 11 is provided between the protrusion 301 and the groove 201, and the second flexible buffer layer 11 is sintered on the side wall of the groove 201, which plays a buffering and protective role for the ceramic sphere 3, and further prevents the ceramic sphere 3 from cracking. In addition, the protrusion 301 is connected to the ceramic sphere 3, and the corners of the protrusion 301 can be rounded to reduce stress concentration and further prevent cracking.

[0031] Reference again Figure 1-2 In this embodiment, a pre-tightening component 8 is provided between the ceramic valve seat 4 and the valve body 1. The pre-tightening component provides a pre-tightening force for the ceramic valve seat 4 to achieve the sealing between the ceramic valve seat 4 and the ceramic ball 3. It should be understood that in actual applications, both sides of the ceramic ball 3 are provided with pre-tightening components 8 to facilitate bidirectional sealing and meet the requirements of bidirectional use. Specifically, the pre-tightening component 8 includes a spring seat 801, a pre-tightening spring 802, a packing pressure ring 803 and a sealing packing 804 arranged in sequence, wherein the spring seat 801 contacts the ceramic valve seat 4, and the sealing packing 804 contacts the valve body 1. It is worth noting that the ceramic valve seat 4 will slightly move back and forth during the switching process of the ceramic ball 3. In the traditional ceramic ball valve, the pre-tightening spring 802 directly contacts the ceramic valve seat 4, and the ceramic valve seat 4 is unevenly stressed. The ceramic valve seat 4 is very easy to be damaged during the switching process of the ceramic ball 3. In the present utility model, the spring seat 801 can balance the pressure of the pre-tightening spring 802 to avoid the end face of the pre-tightening spring 802 from partially contacting the ceramic valve seat 4, thereby solving the above-mentioned defects.

[0032] On the basis of the above, a first sealing ring 9 is provided between the first ceramic bushing 5 and the valve body 1, and a second sealing ring 10 is provided between the ceramic valve seat 4 and the valve body 1. The first sealing ring 9 and the second sealing ring 10 realize radial sealing to prevent medium particles from entering the cavity where the preload assembly 8 is installed and reducing the service life of the preload spring 802. It is easy to understand that the spring can be a cylindrical spring, a wave spring, a disc spring, etc.

[0033] In the utility model, the first sealing ring 9, the second sealing ring 10 and the third sealing ring 14 and other sealing parts are made of flexible graphite or PTFE, which overcomes the working conditions where rubber is prohibited or rubber is not corrosion-resistant. The product is universal and is conducive to standardized production.

[0034] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may be subject to various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A buffer protection ceramic ball valve, comprising a valve body (1), wherein a valve stem (2), a ceramic ball (3) and a ceramic valve seat (4) are mounted in the valve body (1), a first ceramic bushing (5) is disposed on the flow channel side wall of the valve body (1), and a second ceramic bushing (6) is disposed on the valve cavity side wall of the valve body (1) where the ceramic ball (3) is mounted, wherein: A first flexible buffer layer (7) is provided between the valve body (1) and the first ceramic bushing (5), between the valve body (1) and the second ceramic bushing (6), and between the valve body (1) and the ceramic valve seat (4).

2. The buffer protection ceramic ball valve according to claim 1 is characterized in that: The first ceramic bushing (5) and the ceramic valve seat (4) are integrally formed.

3. The buffer protection ceramic ball valve according to claim 1 is characterized in that: A pre-tightening assembly (8) is provided between the ceramic valve seat (4) and the valve body (1), and the pre-tightening assembly (8) comprises a spring seat (801), a pre-tightening spring (802), a packing pressure ring (803) and a sealing packing (804) which are arranged in sequence, wherein the spring seat (801) is in contact with the ceramic valve seat (4), and the sealing packing (804) is in contact with the valve body (1).

4. The buffer protection ceramic ball valve according to claim 3 is characterized in that: A first sealing ring (9) is provided between the first ceramic bushing (5) and the valve body (1), and a second sealing ring (10) is provided between the ceramic valve seat (4) and the valve body (1).

5. The buffer protection ceramic ball valve according to claim 1 is characterized in that: The inner end of the valve stem (2) is provided with a groove (201), and the ceramic sphere (3) is provided with a protrusion (301) that matches the groove (201).

6. The buffer protection ceramic ball valve according to claim 5 is characterized in that: A second flexible buffer layer (11) is provided between the protrusion (301) and the groove (201).

7. The buffer protection ceramic ball valve according to any one of claims 1 to 6, characterized in that: A ceramic ring (12) is provided on the end surface of the flow passage opening of the valve body (1).

8. The buffer protection ceramic ball valve according to claim 7 is characterized in that: A third flexible buffer layer (13) is provided between the ceramic ring (12) and the valve body (1).

9. The buffer protection ceramic ball valve according to claim 7, characterized in that: A third sealing ring (14) is provided between the end surface of the ceramic ring (12) and the valve body (1).

10. The buffer protection ceramic ball valve according to any one of claims 1 to 6, characterized in that: The surface of the valve stem (2) is provided with a corrosion-resistant coating.

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