Ratchet type hand operated diaphragm valve with lock handle

Abstract

The utility model provides a kind of ratchet type manual diaphragm valve with lock handle, including handle, ratchet wheel, cam, first pawl and second pawl, lock piece is set on handle, lock piece is rigidly connected with cam, can drive cam rotation simultaneously by lock piece rotation, lock piece selectively makes pawl and ratchet wheel meshing with driving cam, so that handle can only drive ratchet wheel rotation in single direction.When handle is rotated to valve reaches required state, lock piece can be locked by lock, the utility model handle rotation number is unrestricted, can increase valve operation stroke, applicable to high flow manual valve.Valve locking operation is simple, can be locked directly by hanging lock, convenient operation.Valve can be continued to tighten after locking, so that valve is closed more strictly, and it can be operated quickly after emergency response valve seat failure.

Description

Technical Field

[0001] This utility model relates to the field of valve handle locking technology, and more specifically to a ratchet-type manual diaphragm valve with a locking handle. Background Technology

[0002] Manual diaphragm valves are widely used in the semiconductor manufacturing industry. In many situations, strict control of the medium flow rate is required. Any misoperation or unintended rotation of the handle due to prolonged vibration can have serious consequences. Therefore, to ensure process safety, accurate flow control, and reliable sealing, a locking mechanism for the manual diaphragm valve handle is necessary. Currently, most common handle locking methods on the market use a mechanism to directly lock the handle. This type of handle locking is suitable for diaphragm valves with a handle rotation of less than one turn, but cannot be applied to high-flow manual diaphragm valves. Furthermore, the handle locking process is complex and inconvenient for on-site operation. Once the handle is locked, no torque can be applied to close the valve more tightly, and emergency response is impossible in case of valve seat failure. Utility Model Content

[0003] The purpose of this utility model is to provide a ratchet-type manual diaphragm valve with a locking handle, which solves the technical problems pointed out in the background art, such as the existing manual diaphragm valve handle locking method being unsuitable for high-flow diaphragm valves, the locking operation being complicated, and the inability to apply torque to further close the valve after the handle is locked.

[0004] To achieve the above objectives, this utility model provides a ratchet-type manual diaphragm valve with a locking handle, including a handle, a ratchet, a cam, a first pawl, and a second pawl. A locking plate is provided on the handle, and a locking device is provided on the locking plate to lock the locking plate in a first or second position. The ratchet is fixedly connected to a control rod, and the control rod is threadedly connected to the valve stem. The cam is located inside the handle and rigidly connected to the locking plate. The first and second pawls are symmetrically distributed on both sides of the cam and are tactilely connected to the cam. The cam rotates under the rotation of the locking plate, driving the first or second pawl to engage or disengage from the ratchet. During engagement between the ratchet and the first or second pawl, the handle drives the ratchet to rotate, which in turn drives the control rod to rotate, causing the valve stem to move up and down.

[0005] Furthermore, the locking plate is rigidly connected to the cam via a connecting rod.

[0006] Furthermore, when the locking plate is in the first position, the second pawl engages with the ratchet, and the handle can only drive the ratchet to rotate clockwise; when the locking plate is in the second position, the first pawl engages with the ratchet, and the handle can only drive the ratchet to rotate counterclockwise.

[0007] Furthermore, the first and second pawls are reset by a spring, which is disposed between the handle and the first and second pawls.

[0008] Furthermore, the lock plate is provided with a lock hole, and the lock passes through the lock hole and forms mechanical interference with the outer contour of the handle.

[0009] Furthermore, the outer contour of the handle is wavy and circular.

[0010] Compared with existing technologies, the advantages of this invention are that a locking plate is installed on the handle, which is rigidly connected to the cam. Rotation of the locking plate simultaneously drives the cam to rotate, which in turn actuates the pawl, causing it to engage or disengage from the ratchet. When the pawl engages the ratchet, rotating the handle applies force to the pawl, which in turn applies force to the ratchet, causing it to rotate. The ratchet is fastened to the control rod, which is threaded onto the valve stem. Rotation of the control rod causes the valve stem to move up and down, which in turn moves the valve head to control the valve's opening and closing. The locking plate, driven by the cam, selectively engages the pawl with the ratchet, ensuring the handle can only drive the ratchet in one direction. Once the valve reaches the desired position, the locking plate can be locked using a locking device. This invention allows for unlimited handle rotation, increasing the valve's operating stroke, and is suitable for high-flow manual valves. Valve locking is simple; simply attach the locking device. After locking, the valve can be further tightened for a tighter closure, allowing for quick operation in case of valve seat failure. Attached Figure Description

[0011] Figure 1 A schematic diagram of the overall structure of the diaphragm valve incorporating the concept of this utility model;

[0012] Figure 2 for Figure 1 Top view from direction A;

[0013] Figure 3 for Figure 1 Cross-sectional view along the BB direction;

[0014] In the diagram, 1. Locking plate; 2. Handle; 3. Ratchet; 4. Spring; 5. First pawl; 6. Cam; 7. Connecting rod; 8. Valve body; 9. Valve head; 10. Connecting screw; 11. Valve cap nut; 12. Valve stem; 13. Control rod; 14. Second pawl; 15. First position; 16. Locking hole; 17. Second position; 18. Recess; 19. Baffle. Detailed Implementation

[0015] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0016] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0017] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0018] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when this utility model is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0019] Unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0020] The following describes some embodiments of the present invention in detail with reference to the accompanying drawings.

[0021] like Figure 1-3As shown, the ratchet-type manual diaphragm valve with locking handle of this utility model includes a handle 2, a ratchet 3, a first pawl 5, a cam 6, and a second pawl 14. A recessed portion 18 is provided at the upper edge of the handle 2, defining a first position 15 and a second position 17. A locking plate 1 is provided on the recess 18. The locking plate 1 is strip-shaped and can rotate between the first position 15 and the second position 17. A locking hole 16 is provided at the outer end of the locking plate 1. When the handle 2 is rotated to close or open the valve, the locking device can be passed through the locking hole 16 to lock the locking plate 1.

[0022] Cam 6 is located inside handle 2, below recess 18. Cam 6 is rigidly connected to locking plate 1. When locking plate 1 rotates between first position 15 and second position 17, cam 6 also rotates. Preferably, locking plate 1 is rigidly connected to cam 6 via connecting rod 7. The upper end of connecting rod 7 is fixedly connected to locking plate 1, and the lower end is fixedly connected to cam 6, so that cam 6 and locking plate 1 are linked.

[0023] The ratchet 3 is located adjacent to the cam 6 on the inner side of the handle 2. The ratchet 3 is fixedly connected to the control lever 13, which is threadedly connected to the valve stem 12. The control lever 13 is restrained by the valve cap nut 11 threadedly connected to the valve body 8, so that the control lever 13 can only rotate. A baffle 19 is provided below the ratchet 3. The baffle 19 is fixed to the inner end of the handle 2 by the connecting screw 10, holding the ratchet 3 on the handle 2.

[0024] The first pawl 5 and the second pawl 14 are symmetrically arranged on both sides of the cam 6. The ends of the first pawl 5 and the second pawl 14 are rolledly connected to the inner side of the handle 2, and the sides are rolledly connected to the cam 6. The rotation of the cam 6 causes the first pawl 5 and the second pawl 14 to selectively engage with the ratchet 3. A spring 4 is also provided between the first pawl 5 and the second pawl 14 and the handle 2, providing the spring force for the first pawl 5 and the second pawl 14 to return to their original position. When the first pawl 5 or the second pawl 14 engages with the ratchet 3, the first pawl 5 or the second pawl 14 acts as a linkage mechanism between the handle 2 and the ratchet 3. When the handle 2 is rotated, the handle 2 transmits torque to the ratchet 3 through the first pawl 5 or the second pawl 14, causing the ratchet 3 to rotate, which in turn causes the control lever 13 to rotate. The rotation of the control lever 13 in place causes the valve stem 12 to move radially up and down, which in turn causes the valve head 9 to move up and down, thereby controlling the opening or closing of the valve. The number of rotations of handle 2 is unlimited, which can increase the valve operating stroke and is applicable to high-flow manual valves.

[0025] Furthermore, when the locking plate 1 rotates to the first position 15, the cam 6 rotates, causing the second pawl 14 to engage with the ratchet 3, and the first pawl 5 to disengage from the ratchet 3. See Appendix for details. Figure 3When the handle 2 is turned clockwise, it drives the ratchet 3 to rotate clockwise via the second pawl 14. The ratchet 3 then drives the control lever 13 to rotate clockwise, causing the valve stem 12 to move downwards, thus closing the valve. If the handle 2 is turned counterclockwise, the second pawl 14 will be disengaged by the ratchet 3, preventing it from rotating. The handle 2 will only rotate freely, and the valve stem 12 will not move radially. When the locking plate 1 rotates to the second position 17, the cam 3 rotates, causing the first pawl 5 to engage with the ratchet 3, and the second pawl 14 to disengage from the ratchet 3. When the handle 2 is turned counterclockwise, it drives the ratchet 3 to rotate counterclockwise via the first pawl 5. The ratchet 3 then drives the control lever 13 counterclockwise, causing the valve stem 12 to move upwards, thus opening the valve. If the handle 2 is turned clockwise, the first pawl 5 will be disengaged by the ratchet 3, preventing it from rotating. The handle 2 will only rotate freely, and the valve stem 12 will not move radially. One aspect of this utility model is that it can respond to emergencies when the valve seat malfunctions and the valve cannot be completely closed. In this case, the handle 2 can be turned clockwise to make the valve stem 12 drive the valve head 9 to continue to press the valve body 1, thereby reducing valve leakage.

[0026] To reduce the weight of the valve, the handle 2 is preferably made of aluminum alloy, while the locking plate 1, ratchet 3, cam 6, first pawl 5, and second pawl 14 are all made of 316 stainless steel. Ideally, the lock should directly mechanically interfere with the outer contour of the handle 2, making locking exceptionally simple. See appendix for details. Figure 2 The outer contour of the handle 2 is a wave-shaped circular structure. When the lock plate 1 is rotated to the first position 15 or the second position 17, the lock hole 16 is located exactly in the concave trough, while the convex crest is located between the first position 15 and the second position 17. The lock and the crest form a natural mechanical interference.

[0027] The basic principles and advantages of this utility model have been described above. For those skilled in the art, the above embodiments are merely illustrative of the technical solutions of this utility model and not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some or all of the technical features by reading this specification. Any obvious substitutions are within the protection scope of this utility model without departing from its concept.

Claims

1. A ratchet-type manual diaphragm valve with a locking handle, characterized in that, include: A handle (2) is provided with a locking piece (1), and a lock is provided on the locking piece (1) to lock the locking piece (1) in a first position (15) or a second position (17); A ratchet (3) is fixedly connected to a control lever (13), which is threadedly connected to a valve stem (12); A cam (6) is disposed inside the handle (2) and is rigidly connected to the locking piece (1); The first pawl (5) and the second pawl (14) are symmetrically distributed on both sides of the cam (6) and are in rolling connection with the cam (6); The cam (6) rotates under the rotation of the locking plate (1) and drives the first pawl (5) or the second pawl (14) to engage or disengage with the ratchet (3); During the engagement of the ratchet (3) with the first pawl (5) or the second pawl (14), the handle (2) drives the ratchet (3) to rotate and drives the control lever (13) to rotate, so that the valve stem (12) moves up and down.

2. The ratchet-type manual diaphragm valve with a locking handle according to claim 1, characterized in that: The locking plate (1) is rigidly connected to the cam (6) via the connecting rod (7).

3. A ratchet-type manual diaphragm valve with a lock handle according to claim 2, characterized in that: When the locking plate (1) is in the first position (15), the second pawl (14) engages with the ratchet (3), and the handle (2) can only drive the ratchet (3) to rotate clockwise; when the locking plate (1) is in the second position (17), the first pawl (5) engages with the ratchet (3), and the handle (2) can only drive the ratchet (3) to rotate counterclockwise.

4. A ratchet-type manual diaphragm valve with a lock handle according to claim 3, characterized in that: The first pawl (5) and the second pawl (14) are reset by a spring (4), which is disposed between the handle (2) and the first pawl (5) and the second pawl (14).

5. A ratchet-type manual diaphragm valve with a lock handle according to claim 1, characterized in that: The lock plate (1) is provided with a lock hole (16), and the lock passes through the lock hole (16) and forms mechanical interference with the outer contour of the handle (2).

6. A ratchet-type manual diaphragm valve with a lock handle according to claim 5, characterized in that: The outer contour of the handle (2) is wavy and circular.

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