Butterfly valve with internal bypass

Abstract

The utility model discloses a butterfly valve with an inner bypass, and relates to the field of butterfly valves. The butterfly valve with the inner bypass comprises a valve body, a valve seat is fixedly installed on the surface of an inner ring of the valve body, a butterfly plate is arranged on the inner ring of the valve seat, a first valve rod and a second valve rod are fixedly installed on the outer side of the butterfly plate, and the first valve rod and the second valve rod both penetrate through the valve body and extend outwards. The butterfly plate is provided with an inner bypass hole penetrating front and back, a baffle is arranged on the outer side of the butterfly plate in a sliding mode, and the baffle is connected with a driving unit. According to the butterfly valve with the inner bypass, the driving unit can drive the baffle to move on the outer side of the butterfly plate, when the baffle moves relative to the inner bypass hole, opening and closing of the inner bypass hole can be achieved, then in the closing process of the butterfly plate, the inner bypass hole is kept open, then the impact force of water flow can be greatly reduced, and after the butterfly plate is closed, the inner bypass hole can be opened and closed. And the inner bypass hole is gradually closed by using the baffle plate.

Description

Technical Field

[0001] The utility model relates to the technical field of butterfly valves, in particular to a butterfly valve with an internal bypass. Background Art

[0002] The closing element (disc or disc) of a butterfly valve is a circular disc that rotates around the valve shaft to open and close. In pipelines, butterfly valves primarily serve to cut off and throttle flow. When the disc is rotated 90°, the valve is fully open or fully closed. A butterfly valve typically consists of a valve body, stem, and disc.

[0003] When the internal closing part of the butterfly valve is closed, the sudden closure of the valve will generate fluid shock and pressure fluctuations. After the closing part receives the impact force for a long time, it may cause the closing part to move. On the one hand, it may cause damage to the connection between the valve stem and the closing part. On the other hand, it may affect the sealing between the closing part and the valve body. Therefore, this application proposes a butterfly valve with internal bypass. Utility Model Content

[0004] In response to the shortcomings of the existing technology, the utility model provides a butterfly valve with internal bypass, which solves the problem that the sudden closing of the valve will cause fluid shock and pressure fluctuations. After the closing part is subjected to impact force for a long time, it may cause the closing part to move. On the one hand, it may cause damage to the connection between the valve stem and the closing part. On the other hand, it may affect the sealing between the closing part and the valve body.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: a butterfly valve with internal bypass, comprising a valve body, a valve seat fixedly mounted on the inner ring surface of the valve body, a butterfly plate provided on the inner ring of the valve seat, a first valve stem and a second valve stem fixedly mounted on the outer side of the butterfly plate, the first valve stem and the second valve stem both extending outward through the valve body, and an end portion of the first valve stem connected to an external drive motor;

[0006] The butterfly plate is provided with an inner bypass hole which passes through from front to back. A baffle is slidably provided on the outer side of the butterfly plate, and the baffle is connected to a driving unit, and the driving unit can drive the baffle to move.

[0007] Preferably, an arc-shaped limiting groove is provided on the outer side of the butterfly plate, and a limiting block slidably arranged on the inner wall of the arc-shaped limiting groove is fixedly connected to the outer side of the baffle.

[0008] Preferably, a first bracket and a second bracket are fixedly installed on the outer side of the valve body, the end of the first valve stem on the outside passes through the first bracket, and the end of the second valve stem on the outside is rotatably arranged inside the second bracket.

[0009] Preferably, the driving unit includes:

[0010] A push rod, the push rod is movably inserted into the interior of the second valve stem, and the end of the push rod outside passes through the second bracket and is connected to the external cylinder;

[0011] The slider is slidably arranged on the outside of the butterfly plate. A crank is arranged on the outside of the slider, and the end of the crank is fixedly connected to the baffle.

[0012] Preferably, a positioning shaft is fixedly mounted on the outer side of the butterfly plate, and the crank is movably sleeved on the outer side of the positioning shaft.

[0013] Preferably, a positioning groove is provided on the outer side of the crank, a positioning block is slidably provided on the inner wall of the positioning groove, and a crank pin is installed between the positioning block and the slider.

[0014] Preferably, a guide rod is movably inserted into the interior of the slider, and both ends of the guide rod are fixedly connected to the outer side of the butterfly plate.

[0015] The utility model discloses a butterfly valve with an internal bypass, which has the following beneficial effects: during use of the butterfly valve with an internal bypass, an external driving motor can drive the first valve stem to drive the butterfly plate to rotate, and the rotation achieved can achieve the purpose of opening and closing the valve body, and at the same time the driving unit can drive the baffle to move on the outside of the butterfly plate. When the baffle moves relative to the internal bypass hole, the internal bypass hole can be opened and closed, and the internal bypass hole can maintain a passage during the closing process of the butterfly plate, thereby greatly reducing the impact force of the water flow. After the butterfly plate is closed, the baffle can be used to gradually close the internal bypass hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

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

[0018] Figure 2 This is a schematic diagram of the back structure of the utility model;

[0019] Figure 3 This is a schematic structural diagram of the drive unit of the utility model.

[0020] In the figure: 1. valve body; 11. valve seat; 12. butterfly plate; 13. first valve stem; 14. second valve stem; 15. internal bypass hole; 16. baffle; 161. arc-shaped limit groove; 17. first bracket; 18. second bracket; 2. drive unit; 21. push rod; 22. slider; 23. positioning shaft; 24. crank; 25. positioning groove; 26. positioning block; 27. guide rod. DETAILED DESCRIPTION

[0021] In order to better understand the above technical solution, the above technical solution will be described in detail below with reference to the accompanying drawings and specific implementation methods.

[0022] The embodiment of the utility model discloses a butterfly valve with internal bypass.

[0023] According to the attached Figure 1-3 As shown, it includes a valve body 1, a valve seat 11 is fixedly mounted on the inner ring surface of the valve body 1, a butterfly plate 12 is provided on the inner ring of the valve seat 11, a first valve stem 13 and a second valve stem 14 are fixedly mounted on the outer side of the butterfly plate 12, the first valve stem 13 and the second valve stem 14 both extend outward through the valve body 1, and the end of the first valve stem 13 is connected to an external drive motor;

[0024] The butterfly plate 12 is provided with an inner bypass hole 15 which passes through from front to back. A baffle 16 is slidably provided on the outer side of the butterfly plate 12 , and the baffle 16 is connected to the driving unit 2 , which can drive the baffle 16 to move.

[0025] During use, the external driving motor can drive the first valve stem 13 to drive the butterfly plate 12 to rotate, and the rotation achieved can achieve the purpose of opening and closing the valve body 1. At the same time, the driving unit 2 can drive the baffle 16 to move on the outside of the butterfly plate 12. When the baffle 16 moves relative to the inner bypass hole 15, the inner bypass hole 15 can be opened and closed, and then in the process of closing the butterfly plate 12, the inner bypass hole 15 can maintain a passage, which can greatly reduce the impact force of the water flow. After the butterfly plate 12 is closed, the baffle 16 can be used to gradually close the inner bypass hole 15.

[0026] Furthermore, an arc-shaped limiting groove 161 is formed on the outer side of the butterfly plate 12 , and a limiting block slidably disposed on the inner wall of the arc-shaped limiting groove 161 is fixedly connected to the outer side of the baffle 16 .

[0027] The arc-shaped limiting groove 161 and the limiting block are provided to limit the movement of the baffle 16 , so that the baffle 16 can move along a predetermined track.

[0028] Furthermore, a first bracket 17 and a second bracket 18 are fixedly mounted on the outside of the valve body 1 , the end of the first valve stem 13 on the outside passes through the first bracket 17 , and the end of the second valve stem 14 on the outside is rotatably arranged inside the second bracket 18 .

[0029] The first bracket 17 and the second bracket 18 are provided to support the valve body 1 and the first valve stem 13 and the second valve stem 14 .

[0030] Specifically disclosed, the drive unit 2 includes:

[0031] The push rod 21 is movably inserted into the interior of the second valve stem 14, and the end of the push rod 21 at the outside passes through the second bracket 18 and is connected to the external cylinder;

[0032] The slider 22 is slidably disposed on the outside of the butterfly plate 12 . A crank 24 is disposed on the outside of the slider 22 , and an end of the crank 24 is fixedly connected to the baffle 16 .

[0033] Furthermore, a positioning shaft 23 is fixedly mounted on the outer side of the butterfly plate 12 , and a crank 24 is movably sleeved on the outer side of the positioning shaft 23 .

[0034] Furthermore, a positioning groove 25 is formed on the outer side of the crank 24 , a positioning block 26 is slidably provided on the inner wall of the positioning groove 25 , and a crank pin is installed between the positioning block 26 and the slider 22 .

[0035] During use, when the push rod 21 is driven to move vertically under the action of the external cylinder, the slider 22 can be driven to move accordingly, and the slider 22 is connected to the crank 24 through the positioning groove 25 and the positioning block 26, so that the crank 24 can be rotated relative to the positioning shaft 23, thereby driving the baffle 16 to move in an arc. At the same time, the moving distance of the push rod 21 is used to facilitate the control of the rotation angle of the crank 24 and the baffle 16, thereby facilitating the control of the size of the internal bypass hole 15.

[0036] Furthermore, a guide rod 27 is movably inserted into the interior of the slider 22 , and both ends of the guide rod 27 are fixedly connected to the outer side of the butterfly plate 12 .

[0037] The guide rod 27 is provided to guide the slider 22 , thereby enabling the slider 22 to move vertically stably.

[0038] During use, the external driving motor can drive the first valve stem 13 to drive the butterfly plate 12 to rotate, and the rotation achieved can achieve the purpose of opening and closing the valve body 1. At the same time, the driving unit 2 can drive the baffle 16 to move on the outside of the butterfly plate 12. When the baffle 16 moves relative to the inner bypass hole 15, the inner bypass hole 15 can be opened and closed, and then in the process of closing the butterfly plate 12, the inner bypass hole 15 can maintain a passage, which can greatly reduce the impact force of the water flow. After the butterfly plate 12 is closed, the baffle 16 can be used to gradually close the inner bypass hole 15.

[0039] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and improvements are intended to fall within the scope of the present invention. The scope of protection claimed in this invention is defined by the appended claims and their equivalents.

Claims

1. A butterfly valve with internal bypass, comprising a valve body (1), characterized in that: A valve seat (11) is fixedly mounted on the inner ring surface of the valve body (1), a butterfly plate (12) is provided on the inner ring of the valve seat (11), a first valve stem (13) and a second valve stem (14) are fixedly mounted on the outer side of the butterfly plate (12), the first valve stem (13) and the second valve stem (14) both penetrate the valve body (1) and extend outward, and the end of the first valve stem (13) is connected to an external drive motor; The butterfly plate (12) is provided with an inner bypass hole (15) which is passed through from front to back. A baffle (16) is slidably provided on the outer side of the butterfly plate (12). The baffle (16) is connected to a driving unit (2). The driving unit (2) can drive the baffle (16) to move.

2. A butterfly valve with internal bypass according to claim 1, characterized in that: An arc-shaped limiting groove (161) is provided on the outer side of the butterfly plate (12), and a limiting block slidably arranged on the inner wall of the arc-shaped limiting groove (161) is fixedly connected to the outer side of the baffle (16).

3. A butterfly valve with internal bypass according to claim 1, characterized in that: A first bracket (17) and a second bracket (18) are fixedly mounted on the outside of the valve body (1); the end of the first valve stem (13) on the outside passes through the first bracket (17); and the end of the second valve stem (14) on the outside is rotatably arranged inside the second bracket (18).

4. A butterfly valve with internal bypass according to claim 3, characterized in that: The driving unit (2) comprises: A push rod (21), the push rod (21) is movably inserted into the interior of the second valve stem (14), and the end of the push rod (21) located outside passes through the second bracket (18) and is connected to the external cylinder; A slider (22) is slidably arranged on the outside of the butterfly plate (12), a crank (24) is arranged on the outside of the slider (22), and the end of the crank (24) is fixedly connected to the baffle (16).

5. A butterfly valve with internal bypass according to claim 4, characterized in that: A positioning shaft (23) is fixedly mounted on the outer side of the butterfly plate (12), and a crank (24) is movably sleeved on the outer side of the positioning shaft (23).

6. A butterfly valve with internal bypass according to claim 4, characterized in that: A positioning groove (25) is provided on the outer side of the crank (24), a positioning block (26) is slidably provided on the inner wall of the positioning groove (25), and a crank pin is installed between the positioning block (26) and the slider (22).

7. A butterfly valve with internal bypass according to claim 4, characterized in that: A guide rod (27) is movably inserted into the interior of the slider (22), and both ends of the guide rod (27) are fixedly connected to the outside of the butterfly plate (12).

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