Self-locking butterfly valve

Abstract

The utility model relates to the technical field of butterfly valves, in particular to a self-locking butterfly valve which comprises a valve body and a butterfly plate rotationally arranged in the valve body. The adjusting assembly is used for driving the butterfly plate to rotate so as to open and close or adjust flow, the adjusting assembly comprises a valve rod, one end of the valve rod is connected with the rotating axis of the butterfly plate, and the other end of the valve rod is matched with an inner groove formed in the valve body in a rotating mode. The first stop piece is arranged on the valve rod in the sliding mode, the second stop piece is arranged in the valve body, the first stop piece and the second stop piece can be matched with each other through the driving assembly, and the rotation freedom degree of the valve rod along the axis from the interior of the valve body is limited; the valve cannot be operated without releasing the clamping state between the first stop piece and the second stop piece by an operator, so that the situation that the butterfly plate is accidentally opened or closed due to misoperation or mistaken touch is prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of butterfly valves, in particular to a self-locking butterfly valve. Background Art

[0002] The butterfly valve consists of a valve body, a butterfly plate, a valve stem, a handle and a seal. When working, the butterfly plate rotates around its own axis in the valve body to achieve the purpose of opening, closing or regulation. Previously, many personal injury accidents occurred due to valve misoperation, especially those involving high-temperature, high-pressure, toxic and hazardous media pipelines. For example, misoperation of high-temperature steam valves caused burns to people; misoperation of gas valves posed a threat to human life safety. Therefore, in order to ensure the personal safety of on-site personnel, it is very meaningful to self-lock the butterfly valve to prevent accidents caused by misoperation. Utility Model Content

[0003] In view of this, the purpose of the present invention is to provide a self-locking butterfly valve to solve the technical problem that the valve stem of the existing butterfly valve is easily accidentally touched, causing the butterfly plate to open or close.

[0004] Based on the above objectives, the utility model provides a self-locking butterfly valve, comprising:

[0005] A valve body and a butterfly plate rotatably arranged in the valve body;

[0006] A regulating assembly for driving the butterfly plate to rotate, thereby opening and closing or regulating the flow, the regulating assembly comprising: a valve stem having one end connected to the rotation axis of the butterfly plate, and the other end of the valve stem rotatably engaged with an inner groove provided in the valve body;

[0007] a first stopper movably connected to the valve stem and capable of rotating synchronously therewith;

[0008] a second stopper provided in the valve body and used to cooperate with the first stopper to limit the rotational freedom of the valve stem along the axis;

[0009] A drive assembly for driving the first stopper and the second stopper to engage or separate with each other, thereby locking or releasing the rotational freedom of the valve stem along the axis.

[0010] As an optimal technical solution of the present invention, the first stop member includes a movable ring that is sleeved on the outside of the valve stem and can slide along the axis of the valve stem. A movable groove that cooperates with the sliding of the movable ring is opened in the valve body, and a protrusion is provided on the movable ring; the second stop member is a groove opened in the inner wall of the movable groove, and the groove is engaged with the protrusion.

[0011] As a preferred technical solution of the present utility model, the drive assembly includes:

[0012] A connecting rod is provided on the inner wall of the movable ring and extends along the center of the movable ring, wherein the connecting rod is slidably engaged with a sliding groove provided on the surface of the valve stem;

[0013] A driving rod rotatably engaged with a rotating hole provided in the valve stem;

[0014] A first threaded column is provided at the lower end of the driving rod, and an internal thread is provided on the side of the connecting rod facing the first threaded column, and the internal thread is threadably matched with the first threaded column.

[0015] As a preferred technical solution of the present invention, the drive assembly further includes a locking structure for limiting the rotation of the drive rod along its axis.

[0016] As a preferred technical solution of the present utility model, the locking structure includes:

[0017] a second threaded column provided at the upper end of the driving rod, the second threaded column passing through the rotating hole and extending outward;

[0018] A locking nut threadably engaged with the second threaded column.

[0019] As a preferred technical solution of the present invention, the regulating assembly further comprises a rotary disk connected to the valve stem, and the rotary disk rotatably cooperates with a rotary groove provided in the valve body.

[0020] As a preferred technical solution of the present invention, a plurality of positioning plates are provided on the outside of the valve body, and positioning holes for connecting flanges are opened on the surfaces of the positioning plates.

[0021] As a preferred technical solution of the present invention, a sealing member is provided between the valve body and the butterfly plate.

[0022] The beneficial effects of the present invention are as follows: the present invention sets a first stopper for sliding on the valve stem and sets a second stopper inside the valve body, and can make the first stopper and the second stopper cooperate with each other through the driving component, so as to limit the rotational freedom of the valve stem along the axial centerline from inside the valve body. If the operator does not release the engagement state between the first stopper and the second stopper, the valve cannot be operated, thereby preventing the butterfly plate from accidentally opening or closing due to improper operation or accidental touch. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the present invention or 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 for the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0024] Figure 1This is a schematic diagram of the external three-dimensional structure of the utility model;

[0025] Figure 2 This is a schematic diagram of a half-cut three-dimensional structure of the present utility model;

[0026] Figure 3 For the utility model Figure 2 A in the middle is an enlarged structural diagram;

[0027] Figure 4 This is a schematic diagram of a half-section three-dimensional structure of a valve stem of the present invention;

[0028] Figure 5 This is a schematic diagram of the three-dimensional structure of the driving rod, the first threaded column, the second threaded column and the movable ring of the utility model;

[0029] Figure 6 This is a schematic diagram of the three-dimensional structure of the valve stem of the present utility model.

[0030] The markings in the figure are: 1. Valve body; 2. Seal; 3. Butterfly plate; 4. Valve stem; 5. Handle; 6. Positioning plate; 7. Positioning hole; 8. Turntable; 9. Rotating groove; 10. Movable ring; 11. Movable groove; 12. Protrusion; 13. Groove; 14. Connecting rod; 15. Slide groove; 16. First threaded column; 17. Internal thread; 18. Drive rod; 19. Second threaded column; 20. Locking nut; 21. Handwheel; 22. Rotating hole; 23. Inner groove. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments.

[0032] It should be noted that, unless otherwise defined, the technical or scientific terms used in this utility model should have the usual meanings understood by people with ordinary skills in the field to which this utility model belongs. The "first", "second" and similar words used in this utility model do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative position relationships. When the absolute position of the object being described changes, the relative position relationship may also change accordingly.

[0033] like Figure 1 and Figure 2As shown, a self-locking butterfly valve comprises: a valve body 1 and a butterfly plate 3 rotatably disposed in the valve body 1; a regulating assembly for driving the butterfly plate 3 to rotate, thereby opening and closing or regulating the flow rate, the regulating assembly comprising: a valve stem 4 having one end connected to the rotation axis of the butterfly plate 3, the other end of the valve stem 4 being rotatably engaged with an inner groove 23 provided in the valve body 1; a first stopper movably connected to the valve stem 4 and capable of rotating synchronously therewith; a second stopper disposed in the valve body 1 for cooperating with the first stopper to limit the rotational freedom of the valve stem 4 along the axis; and a driving assembly for driving the first stopper and the second stopper to engage or disengage with each other, thereby locking or releasing the rotational freedom of the valve stem 4 along the axis;

[0034] The above technical solution can prevent the valve stem 4 from rotating due to accidental touch. When in use, the first stop is driven by the driving component to engage with the second stop in the valve body 1, so that the first stop and the second stop are fixed to each other, so that the valve stem 4 connected to the first stop cannot rotate around its axis, and thus the valve stem 4 cannot drive the butterfly plate 3 to rotate. If the operator does not release the engagement state between the first stop and the second stop, the valve cannot be operated, thereby preventing the butterfly plate 3 from accidentally opening or closing due to improper operation or accidental touch.

[0035] like Figure 3 As shown, in this embodiment, the first stopper includes a movable ring 10 that is sleeved on the outside of the valve stem 4 and can slide along the axis of the valve stem 4. The valve body 1 is provided with a movable groove 11 that cooperates with the sliding of the movable ring 10, and the movable ring 10 is provided with a protrusion 12; the second stopper is a groove 13 formed in the inner wall of the movable groove 11, and the groove 13 is engaged with the protrusion 12;

[0036] The above-mentioned technical solution can limit the rotation of the valve stem 4. When the rotation of the valve stem 4 needs to be restricted, the movable ring 10 is pushed to rise along the movable groove 11, thereby driving the protrusion 12 connected to the movable ring 10 to rise synchronously, so that the protrusion 12 and the groove 13 in the valve body 1 are engaged with each other, so that the movable ring 10 cannot rotate, and the valve stem 4 connected to the movable ring 10 cannot rotate. The inability of the valve stem 4 to rotate causes the butterfly plate 3 to be unable to rotate, thereby preventing the butterfly plate 3 from rotating due to accidental touching of the valve stem 4.

[0037] like Figure 4 、 Figure 5 and Figure 6As shown, in this embodiment, the driving assembly includes: a connecting rod 14 provided on the inner wall of the movable ring 10 and extending along the center of the movable ring 10, the connecting rod 14 slidingly engaging with a slide groove 15 provided on the surface of the valve stem 4; a driving rod 18, which rotationally engages with a rotary hole 22 provided in the valve stem 4; a first threaded column 16 provided at the lower end of the driving rod 18, the connecting rod 14 having an internal thread 17 on a side thereof facing the first threaded column 16, the internal thread 17 threadedly engaging with the first threaded column 16;

[0038] The above technical solution can drive the movable ring 10 to rise or fall along the movable groove 11, thereby driving the protrusion 12 to engage or disengage with the groove 13. When it is necessary to drive the movable ring 10 to rise, the driving rod 18 is rotated to rotate it in the first direction. The driving rod 18 drives the first threaded column 16 to rotate. The first threaded column 16 cooperates with the internal thread 17 on one side of the connecting rod 14, thereby driving the connecting rod 14 to rise. The connecting rod 14 drives the movable ring 10 connected thereto to rise, thereby driving the protrusion 12 at the upper end of the movable ring 10 to engage with the groove 13, thereby limiting the rotation of the valve stem 4 from the inside of the valve body 1; similarly, when it is necessary to release the rotation restriction of the valve stem 4, it is only necessary to rotate the driving rod 18 to rotate it in a second direction opposite to the first direction, so as to drive the movable ring 10 to fall, thereby disengaging the protrusion 12 at the upper end of the movable ring 10 from the groove 13.

[0039] like Figure 4 As shown, in this embodiment, the drive assembly further includes a locking structure for limiting the rotation of the drive rod 18 along its axis. Specifically, the locking structure includes: a second threaded column 19 provided at the upper end of the drive rod 18, the second threaded column 19 passing through the rotation hole 22 and extending outward; a locking nut 20 threadedly engaged with the second threaded column 19;

[0040] The above technical solution can prevent accidental touching of the rotation driving rod 18. When the driving rod 18 is rotated to the desired position, the locking nut 20 is tightened to make it fit with the upper end of the valve stem 4, thereby limiting the rotational freedom of the valve stem 4.

[0041] like Figure 2 and Figure 3 As shown, in this embodiment, the regulating assembly further includes a rotary disk 8 connected to the valve stem 4, and the rotary disk 8 rotates in conjunction with a rotary groove 9 provided in the valve body 1;

[0042] The above technical solution can ensure that the valve stem 4 can rotate in the valve body 1 and the valve stem 4 will not fall off from the valve body 1.

[0043] like Figure 1 and Figure 2 As shown, in this embodiment, a plurality of positioning plates 6 are provided on the outside of the valve body 1, and positioning holes 7 for connecting flanges are opened on the surface of the positioning plates 6;

[0044] The above technical solution can be used to connect the valve body 1 to the flange at the pipeline port.

[0045] like Figure 1 and Figure 2 As shown, in this embodiment, a sealing member 2 is provided between the valve body 1 and the butterfly plate 3;

[0046] The above technical solution can prevent the presence of gaps between the valve body 1 and the butterfly plate 3, thereby avoiding leakage.

[0047] like Figure 1 and Figure 2 As shown, in this embodiment, a handle 5 is provided at the upper end of the valve stem 4;

[0048] The above technical solution can facilitate the rotation of the valve stem 4, thereby controlling the rotation of the butterfly plate 3.

[0049] like Figure 5 As shown, in this embodiment, a hand wheel 21 is provided at the upper end of the second threaded column 19;

[0050] The above technical solution can facilitate the rotation of the second threaded column 19 , thereby driving the driving rod 18 and the first threaded column 16 to rotate.

[0051] Working principle: When in use, the hand wheel 21 is rotated in the first direction to drive the second threaded column 19 to rotate, thereby driving the driving rod 18 and the first threaded column 16 to rotate. The first threaded column 16 cooperates with the internal thread 17 on one side of the connecting rod 14, thereby driving the connecting rod 14 to rise, and the connecting rod 14 drives the movable ring 10 connected thereto to rise, thereby driving the protrusion 12 at the upper end of the movable ring 10 to engage with the groove 13, thereby restricting the rotation of the valve stem 4 from the inside of the valve body 1, so that the valve stem 4 cannot rotate around its axis, and furthermore, the valve stem 4 cannot drive the butterfly plate 3 to rotate. When the driving rod 18 is rotated to the desired position, the locking nut 20 is tightened to make it fit with the upper end of the valve stem 4, thereby limiting the rotational freedom of the valve stem 4. If the operator does not release the engagement state between the first stopper and the second stopper, the valve cannot be operated, preventing the butterfly plate 3 from being accidentally opened or closed due to improper operation or accidental touch;

[0052] When it is necessary to release the restriction on the rotational freedom of the valve stem 4, it is only necessary to hold the handwheel 21 and turn the drive rod 18 to rotate it in a second direction opposite to the first direction, so as to drive the movable ring 10 to descend, so that the protrusion 12 at the upper end of the movable ring 10 is disengaged from the groove 13. At this time, the valve stem 4 can rotate freely, and the valve stem 4 can be rotated by holding the handle 5. The valve stem 4 drives the butterfly plate 3 to rotate, thereby controlling the opening and closing of the valve and the flow regulation.

[0053] Those skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present invention (including the claims) is limited to these examples. Within the scope of the present invention, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in detail for the sake of simplicity.

[0054] The present invention is intended to cover all such substitutions, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the scope of protection of the present invention.

Claims

1. A self-locking butterfly valve, comprising: A valve body (1) and a butterfly plate (3) rotatably arranged in the valve body (1); A regulating assembly for driving the butterfly plate (3) to rotate, thereby opening and closing or regulating the flow rate, the regulating assembly comprising: a valve stem (4) having one end connected to the rotation axis of the butterfly plate (3), and the other end of the valve stem (4) being rotatably engaged with an inner groove (23) provided in the valve body (1); Characterized in that, the butterfly valve further comprises: a first stopper movably connected to the valve stem (4) and capable of rotating synchronously therewith; a second stopper provided in the valve body (1) and used to cooperate with the first stopper to limit the rotational freedom of the valve stem (4) along the axis; A drive assembly for driving the first stopper and the second stopper to engage or separate with each other, thereby locking or releasing the rotational freedom of the valve stem (4) along the axis.

2. The self-locking butterfly valve according to claim 1, characterized in that: The first stopper comprises a movable ring (10) which is sleeved on the outside of the valve stem (4) and can slide along the axis of the valve stem (4); a movable groove (11) is provided in the valve body (1) to cooperate with the sliding of the movable ring (10); and a protrusion (12) is provided on the movable ring (10); the second stopper is a groove (13) provided in the inner wall of the movable groove (11), and the groove (13) is engaged with the protrusion (12).

3. The self-locking butterfly valve according to claim 2, characterized in that: The drive assembly includes: A connecting rod (14) is provided on the inner wall of the movable ring (10) and extends along the center of the movable ring (10), wherein the connecting rod (14) is slidably engaged with a sliding groove (15) provided on the surface of the valve stem (4); a driving rod (18) rotatably engaged with a rotating hole (22) provided in the valve stem (4); A first threaded column (16) is provided at the lower end of the driving rod (18), and the connecting rod (14) is provided with an internal thread (17) on the side thereof facing the first threaded column (16), and the internal thread (17) is threadedly matched with the first threaded column (16).

4. The self-locking butterfly valve according to claim 3, characterized in that: The driving assembly further comprises a locking structure for limiting the rotation of the driving rod (18) along its axis.

5. The self-locking butterfly valve according to claim 4, characterized in that: The locking structure comprises: a second threaded column (19) provided at the upper end of the driving rod (18), wherein the second threaded column (19) passes through the rotating hole (22) and extends outward; A locking nut (20) threadably engaged with the second threaded column (19).

6. The self-locking butterfly valve according to any one of claims 1 to 5, characterized in that: The regulating assembly further comprises a rotary disk (8) connected to the valve stem (4), and the rotary disk (8) is rotatably engaged with a rotary groove (9) provided in the valve body (1).

7. The self-locking butterfly valve according to claim 6, characterized in that: A plurality of positioning plates (6) are provided on the outside of the valve body (1), and positioning holes (7) for connecting flanges are provided on the surfaces of the positioning plates (6).

8. The self-locking butterfly valve according to claim 7, characterized in that: A sealing member (2) is provided between the valve body (1) and the butterfly plate (3).

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