A high-temperature self-cleaning bidirectional sealing butterfly valve

Abstract

This utility model relates to a high-temperature self-cleaning bidirectional sealing butterfly valve. The utility model includes a valve body; a valve stem rotatably connected to the valve body; a valve plate connected to the valve stem, for opening or closing the valve when the valve stem rotates; two limiting rings fitted onto the valve stem and limiting the axial ends of the valve plate; and two first bearings fitted onto the valve stem and located on one side of each limiting ring. A flushing channel is formed between each first bearing and the corresponding limiting ring on its side. The two flushing channels communicate with the corresponding axial ends of the valve plate to flush the corresponding axial ends of the valve plate. This utility model, by providing a flushing channel between the valve stem bearings and the limiting rings, continuously flushes away crystalline impurities that may accumulate in the valve under high-temperature conditions, solving the problems of jamming between the bearings and valve stem due to medium crystallization at high temperatures and the easy expansion and jamming of the valve plate at high temperatures.

Description

Technical Field

[0001] This utility model relates to the field of butterfly valve technology, and in particular to a high-temperature self-cleaning bidirectional sealing butterfly valve. Background Technology

[0002] Valves are widely used in oil and gas, petrochemical, environmental protection, power, and metallurgy industries. The valve industry as a whole is showing a good growth trend, with butterfly valves playing an important role, especially bidirectional sealing butterfly valves, whose usage in related industries has been increasing. Current butterfly valve technology involves installing the sealing ring, valve plate base, and pressure ring together, connected to the valve stem by a pin. The actuator drives the valve stem to rotate, causing the sealing surface of the sealing ring to separate from and contact the sealing surfaces of the valve body and valve seat, thus opening and closing the valve.

[0003] The existing technology of bidirectional sealing butterfly valves mainly suffers from the following problems: Under high-temperature conditions, the shortcomings of bidirectional sealing butterfly valves are more exposed. High-temperature media will crystallize as long as there is a temperature difference. Crystallized impurities will accumulate on the inner side of the bearing and the surface of the valve seat, which will cause the valve stem to stick. Under long-term pressure conditions, parts are prone to damage. In addition, when the medium flows in reverse, without the reverse force provided by the valve seat, the valve stem may be slightly bent due to insufficient strength. This causes deformation and compression between the valve stem and the bearing, directly leading to valve stem sticking, high opening torque, and difficulty in opening and closing the valve. Summary of the Invention

[0004] Therefore, this utility model provides a high-temperature self-cleaning bidirectional sealing butterfly valve. By adding a cleaning and cooling structure, it solves the problem of jamming between the bearing and the valve stem caused by the crystallization and accumulation of the medium at high temperatures, and solves the problem of valve plate jamming due to high-temperature expansion.

[0005] To solve the above technical problems, this utility model provides a high-temperature self-cleaning bidirectional sealing butterfly valve, comprising:

[0006] Valve body;

[0007] The valve stem is rotatably connected to the valve body;

[0008] A valve plate, connected to the valve stem, is used to open or close the valve when the valve stem is rotated;

[0009] Two limiting rings are fitted onto the valve stem and limit the axial ends of the valve plate.

[0010] Two first bearings are sleeved on the valve stem and located on one side of each of the limiting rings;

[0011] A flushing channel is formed between each of the first bearings and the corresponding limiting ring on its side. The two flushing channels are connected to the two axial ends of the valve plate to flush the two axial ends of the valve plate.

[0012] In one embodiment of this utility model, the flushing channel includes an axial channel arranged along the axial direction of the first bearing and a pressure relief groove communicating with the axial channel.

[0013] The pressure relief groove is formed between the axial end of the limiting ring and the corresponding axial end of the first bearing.

[0014] In one embodiment of this utility model, the flushing channel includes an axial channel arranged along the axial direction of the first bearing and a pressure relief groove communicating with the axial channel.

[0015] The limiting ring is sleeved outside the first bearing, the axial flow channel extends to the axial end of the first bearing, and the pressure relief groove extends radially along the limiting ring.

[0016] In one embodiment of this utility model, each of the first bearings is mounted on a bearing housing, and the bearing housing is provided with a radial flow channel communicating with the axial flow channel.

[0017] In one embodiment of this utility model, the plurality of axial flow channels are uniformly distributed along the circumference of the valve stem.

[0018] In one embodiment of this utility model, a flushing port is further provided on the valve body and communicates with the radial flow channel.

[0019] In one embodiment of this utility model, two second bearings are also included, which are correspondingly disposed at the two ends of the valve stem.

[0020] In one embodiment of this utility model, the sealing position between the sealing surface of the valve plate and the sealing surface of the valve seat of the valve body is through block contact.

[0021] In one embodiment of this utility model, the valve plate and the valve stem are connected by a key.

[0022] The above-mentioned technical solution of this utility model has the following advantages compared with the prior art:

[0023] This invention adds a cleaning and cooling structure and sets a flushing channel between the valve stem bearing and the limiting ring, which can directly introduce cooling flushing fluid into the bearing and valve plate shaft head area to continuously flush the crystalline impurities that may accumulate in the valve under high temperature conditions. This solves the problems of medium crystallization accumulation causing jamming between the bearing and valve stem at high temperatures and the valve plate easily expanding and jamming the valve at high temperatures.

[0024] This invention improves the rigidity of the valve stem by incorporating multiple first and second bearings and a limiting ring at both ends, effectively reducing bending stress during valve operation. In both bidirectional flow conditions, reliable contact between the valve plate sealing surface and the valve body / seat sealing surface is ensured. Furthermore, the multiple bearings significantly reduce the valve's opening and closing torque. When the medium flows in the opposite direction, the valve stem will no longer experience jamming, ensuring normal valve opening and closing with low torque.

[0025] This invention employs a block-shaped contact structure at the sealing position. Even if the valve plate expands or deforms unevenly at high temperatures, the risk of jamming caused by expansion can be significantly reduced due to the block-shaped localized sealing. This ensures that the valve plate sealing surface and the valve body / seat sealing surface can reliably fit together under all operating conditions, achieving stable sealing performance. It is especially suitable for applications requiring high temperature and variable operating conditions. Attached Figure Description

[0026] To make the content of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0027] Figure 1 This is a schematic diagram of the structure of the bidirectional sealing butterfly valve of this utility model.

[0028] Figure 2 This is a schematic diagram of the medium flow direction of the bidirectional sealing butterfly valve of this utility model.

[0029] Figure 3 It is along Figure 2 A cross-sectional view along the AA direction.

[0030] Figure 4 yes Figure 2 A magnified view of the area at point Y in the middle.

[0031] Figure 5 This is a schematic diagram of the structure of a flushing channel according to the present invention.

[0032] Figure 6 It is along Figure 5 A sectional view along the XX direction.

[0033] Figure 7 This is a schematic diagram of another flushing channel of this utility model.

[0034] Explanation of reference numerals on the accompanying drawings:

[0035] 1. Valve body; 11. Valve seat sealing surface;

[0036] 2. Valve stem;

[0037] 3. Valve plate;

[0038] 4. Limiting ring;

[0039] 5. First bearing;

[0040] 6. Flushing channel; 61. Axial channel; 62. Pressure relief groove; 63. Radial channel; 64. Flushing port;

[0041] 7. Bearing housing;

[0042] 8. Second bearing;

[0043] 9. Key. Detailed Implementation

[0044] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments are not intended to limit the present invention.

[0045] In this utility model, when directions (up, down, left, right, front, and back) are described, it is only for the convenience of describing the technical solution of this utility model, and does not indicate or imply that the technical features referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this utility model.

[0046] In this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," "exceeding," etc. are understood to exclude the stated number; "above," "below," "within," etc. are understood to include the stated number. In the description of this utility model, if "first" or "second" is used, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance or implicitly indicating the number of indicated technical features or the order of the indicated technical features.

[0047] In this utility model, unless otherwise explicitly defined, terms such as "set," "install," and "connect" should be interpreted broadly. For example, they can refer to a direct connection or an indirect connection through an intermediate medium; a fixed connection, a detachable connection, or an integrally formed connection; a mechanical connection, an electrical connection, or a connection capable of mutual communication; or the internal connection of two components or the interaction between two components. Those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model based on the specific content of the technical solution.

[0048] Reference Figure 1 , Figure 3 As shown, this utility model discloses a high-temperature self-cleaning bidirectional sealing butterfly valve, comprising:

[0049] Valve body 1;

[0050] Valve stem 2 is rotatably connected to valve body 1;

[0051] Valve plate 3 is connected to valve stem 2 to open or close the valve when valve stem 2 is rotated;

[0052] Two limiting rings 4 are sleeved on the valve stem 2 and limit the axial ends of the valve plate 3;

[0053] Two first bearings 5 ​​are sleeved on the valve stem 2 and located on one side of each of the limiting rings 4;

[0054] In this configuration, each of the first bearings 5 ​​forms a flushing channel 6 between itself and the corresponding limiting ring 4 on its side. The two flushing channels 6 are connected to the two axial ends of the valve plate 3 to flush the two axial ends of the valve plate 3.

[0055] In one embodiment, refer to Figure 5 As shown, the flushing channel 6 includes an axial channel 61 arranged along the axial direction of the first bearing 5 and a pressure relief groove 62 communicating with the axial channel 61; wherein, the pressure relief groove 62 is formed between the axial end of the limiting ring 4 and the corresponding axial end of the first bearing 5. In other embodiments, refer to Figure 7 As shown, the flushing channel 6 includes an axial channel 61 arranged along the axial direction of the first bearing 5 and a pressure relief groove 62 communicating with the axial channel 61; wherein, the limiting ring 4 is sleeved on the outside of the first bearing 5, the axial channel 61 extends to the axial end of the first bearing 5, and the pressure relief groove 62 extends radially along the limiting ring 4.

[0056] Specifically, refer to Figure 5 , Figure 7 As shown, each of the first bearings 5 ​​is mounted on a bearing housing 7, and the bearing housing 7 is provided with a radial flow channel 63 that communicates with the axial flow channel 61.

[0057] Specifically, refer to Figure 6 As shown, the plurality of axial flow channels 61 are evenly distributed along the circumference of the valve stem 2.

[0058] Specifically, refer to Figure 1 As shown, it also includes a flushing port 64 (connected via a flange) disposed on the valve body 1 and communicating with the radial flow channel 63.

[0059] Through the above settings, the limiting ring 4 serves to limit and protect the valve stem 2, while the first bearing 5 not only protects the valve stem 2 but also has cleaning and cooling functions. Under high-temperature and harsh operating conditions, crystalline impurities generated by the medium accumulate in the valve neck and inside the bearing, causing the valve to jam and increasing torque. Cooling flushing fluid can be used to flush away the impurities. The flushing fluid enters from the flushing port 64 and continuously flushes the inner wall of the bearing along the flushing channel 6. By setting the pressure relief groove 62, the flushing material can enter the valve cavity and be flushed away with the medium, thus achieving a cleaning effect.

[0060] Furthermore, the flushing fluid continuously flows out from the pressure relief groove 62, washing over the valve plate 3 shaft head. This lowers the temperature at the valve plate 3 shaft head, preventing the valve plate 3 from expanding due to high temperature and causing the valve to seize up. At the same time, the temperature of the bearing and valve stem 2 is balanced, further preventing seizure and fully achieving a cooling effect.

[0061] In one embodiment, refer to Figure 4 As shown, the sealing position between the sealing surface of the valve plate 3 and the valve seat sealing surface 11 of the valve body 1 is through block contact. It can be understood that the limiting ring 4 prevents the valve plate 3 from moving up and down, ensuring complete contact between the sealing surface of the valve plate 3 and the valve seat sealing surface 11 of the valve body 1. Changing the overall contact of the sealing surface of the valve plate 3 to block contact at the sealing position addresses the issue that, at high temperatures, the valve plate 3 might experience uneven expansion. The original overall contact would have resulted in the sealing surfaces becoming jammed due to uneven expansion, making it difficult to open the valve. The current design with block contact at the sealing position minimizes uneven deformation during high-temperature expansion, resulting in very small deformation at the sealing point, allowing for easy sealing at high temperatures. This structure is highly suitable for sealing valves at high temperatures. It should be noted that sealing blocks can be incorporated into the design of the sealing surface of the valve plate 3 or the valve seat sealing surface 11 of the valve body 1. These sealing blocks protrude above other parts of the sealing surface, forming a seal when the valve is closed by the raised block structure fitting against the corresponding valve seat sealing surface 11.

[0062] In one embodiment, two second bearings 8 are also included, correspondingly disposed at the two ends of the valve stem 2; the valve plate 3 and the valve stem 2 are connected by a key 9.

[0063] It should be noted that the valve plate 3, key 9, two limit rings 4, two first bearings 5, and two second bearings 8 are all installed along the valve stem 2. (Refer to...) Figure 2As shown, when the medium flows in direction 1, the valve plate 3 is pushed by the medium force, but the valve seat of the valve body 1 has a reaction force, so the valve stem 2 experiences very little bending force, and the sealing surface of the valve plate 3 and the sealing surface 11 of the valve seat of the valve body 1 are completely in contact. When the medium flows in direction 2, the valve plate 3 is pushed by the medium force, but at this time the valve seat of the valve body 1 has no reaction force. The two limit rings 4, the two first bearings 5, and the two second bearings 8 all protect the valve stem 2. The bearing support structure and multiple bearings strengthen the rigidity of the valve stem 2, so the valve stem 2 will not experience a large bending force. The sealing surface of the valve plate 3 and the sealing surface 11 of the valve seat of the valve body 1 can be completely in contact, ensuring valve sealing. At the same time, the multi-bearing structure can reduce valve torque and make valve opening and closing easy.

[0064] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solution of this utility model and not to limit it. Although this utility model has been described in detail with reference to examples, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A high temperature self-cleaning bidirectional sealing butterfly valve, characterized in that, include: Valve body (1); The valve stem (2) is rotatably connected to the valve body (1); A valve plate (3) is connected to the valve stem (2) to open or close the valve when the valve stem (2) is rotated; Two limiting rings (4) are sleeved on the valve stem (2) and limit the axial ends of the valve plate (3); Two first bearings (5) are sleeved on the valve stem (2) and located on one side of each of the limiting rings (4); Among them, each of the first bearings (5) forms a flushing channel (6) between itself and the limiting ring (4) on its corresponding side. The two flushing channels (6) are connected to the two axial ends of the valve plate (3) to flush the two axial ends of the valve plate (3).

2. The high temperature self-cleaning bidirectional sealing butterfly valve according to claim 1, characterized in that, The flushing channel (6) includes an axial channel (61) arranged along the axial direction of the first bearing (5) and a pressure relief groove (62) communicating with the axial channel (61). The pressure relief groove (62) is formed between the axial end of the limiting ring (4) and the axial end of the corresponding first bearing (5).

3. The high temperature self-cleaning bidirectional sealing butterfly valve according to claim 1, characterized in that, The flushing channel (6) includes an axial channel (61) arranged along the axial direction of the first bearing (5) and a pressure relief groove (62) communicating with the axial channel (61). The limiting ring (4) is sleeved outside the first bearing (5), the axial flow channel (61) extends to the axial end of the first bearing (5), and the pressure relief groove (62) extends radially along the limiting ring (4).

4. The high temperature self-cleaning bidirectional sealing butterfly valve according to claim 2 or 3, characterized in that, Each of the first bearings (5) is mounted on a bearing housing (7), and the bearing housing (7) is provided with a radial flow channel (63) communicating with the axial flow channel (61).

5. The high temperature self-cleaning butterfly valve of claim 2 or 3, wherein, The plurality of said axial flow channels (61) are evenly distributed circumferentially along the valve stem (2).

6. The high temperature self-cleaning bi-directional seal butterfly valve of claim 4, wherein, It also includes a flushing port (64) disposed in the valve body (1) and communicating with the radial flow channel (63).

7. The high temperature self-cleaning butterfly valve of claim 1, wherein, It also includes two second bearings (8), which are respectively disposed at the two ends of the valve stem (2).

8. The high temperature self-cleaning double-seal butterfly valve according to claim 1, wherein, The sealing position between the sealing surface of the valve plate (3) and the valve seat sealing surface (11) of the valve body (1) is through block contact.

9. The high temperature self-cleaning double-seal butterfly valve according to claim 1, wherein, The valve plate (3) and the valve stem (2) are connected by a key (9).

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