Intercepting mechanism and stop valve

Abstract

The utility model relates to the technical field of cut-off valves, in particular to a cut-off mechanism and a cut-off valve. The top end of the valve shell is connected with the valve cover through a flange, a nut sleeve is integrally formed on the valve cover, the interior of the nut sleeve is in threaded connection with the threaded valve rod, the top end of the threaded valve rod is provided with a rotating handle, the bottom end of the threaded valve rod is provided with a cut-off valve element, and the middle of the threaded valve rod is rotationally provided with a limiting ring; a non-return assembly used for limiting the limiting ring is arranged on the valve shell. The check assembly is arranged on the valve body, when the cut-off valve element is in a cut-off state on fluid, the check assembly limits the threaded valve rod through the limiting ring, the phenomenon that the threaded valve rod drives the cut-off valve element to slide under the action of fluid impulsive force is avoided, and the structural setting stability of the check assembly is improved; limiting on the threaded valve rod can be relieved, the threaded valve rod can be conveniently and manually controlled, and the overall operability is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of stop valves, in particular to a cut-off mechanism and a stop valve. Background Art

[0002] A stop valve is a valve used to control the flow of fluid. It is usually used to fully open or fully close the fluid in a pipeline, rather than to regulate the flow. The working principle of a stop valve is to fully close or fully open the sealing surface between the valve seat and the valve core by rotating or moving the valve core or valve cover, thereby controlling the flow of fluid. This valve is usually used in situations where the flow of fluid needs to be quickly cut off, such as shutting off a water supply pipeline in an emergency.

[0003] A Chinese patent with authorization announcement number CN219570899U discloses a stop valve, in which the valve stem can simultaneously drive a driving member to move up and down, so that the driving member can abut against a first stroke switch, and a first display device electrically connected to the first stroke switch can reflect whether the first stroke switch and the driving member are in an abutment state, thereby allowing staff to intuitively see the state of the stop valve, making it easier for staff to control the stop valve.

[0004] However, in actual use of the stop valve mentioned above, the valve stem and the valve housing are in threaded connection, and the water hole is blocked by rotating and pressing down. However, once the thread slips, the valve stem is likely to drive the valve core up under the action of the fluid impact, making the valve body's operation less stable. Utility Model Content

[0005] In view of the problems existing in the background technology, a flow interception mechanism and a stop valve are proposed. A check assembly is arranged on the valve body. When the interception valve core is in a state of intercepting fluid, the check assembly limits the threaded valve stem through a limit ring to prevent the interception valve core from slipping under the action of fluid impact, thereby improving the stability of its structural setting.

[0006] The utility model provides a flow cut-off mechanism, comprising

[0007] The threaded valve stem has a turning handle at the top, a retaining valve core at the bottom, and a limit ring at the middle;

[0008] A check assembly, arranged on one side of the limit ring, used to limit the limit ring, and having a pass position and a blocking position; and

[0009] The limit drive component is used to drive the non-return assembly to switch from the blocking position to the passing position.

[0010] Preferably, the non-return assembly comprises a fixed cylinder, a compression spring, a slide plate and a convex block, wherein a compression spring is arranged in the fixed cylinder, one end of the compression spring is connected to a slide plate, and the slide plate is slidably connected to the fixed cylinder;

[0011] A convex block is arranged on the side of the slide plate, and a yielding inclined surface for the limiting ring to be squeezed is opened at the corner of the convex block.

[0012] Preferably, the limit drive member includes a pull rod, a handle and a positioning member. The pull rod is installed on the side of the skateboard away from the protrusion, one end of which passes through the fixed tube and is rotatably connected to the handle. The end surface of the fixed tube is provided with a positioning member for positioning the handle.

[0013] Preferably, the positioning member comprises a U-shaped frame, and a horizontal end of the U-shaped frame is provided with a slot that matches the cross-sectional shape of the handle.

[0014] The utility model also provides a stop valve having the above-mentioned interception mechanism, which comprises a valve housing and a valve cover. The valve housing is connected to the valve cover via a flange, and a nut sleeve is integrally formed on the valve cover. The nut sleeve is threadedly connected to the threaded valve stem.

[0015] Preferably, a flow port is provided inside the valve housing, the intercepting valve core is arranged opposite to the flow port, and the valve housing and the fixing cylinder are integrally formed.

[0016] Through the above technical scheme, that is, the intercepting valve disclosed in the utility model, a check assembly is arranged on the valve body. With the cooperation of the compression spring, the slide plate, the protrusion and the limit ring, when the intercepting valve core is in a trapped state of the fluid, the check assembly limits the threaded valve stem through the limit ring to prevent the intercepting valve core from slipping under the action of the fluid impact force, thereby improving the stability of its structural setting. At the same time, a limit drive component is arranged to release the limit on the threaded valve stem, facilitate manual operation of the threaded valve stem, and improve the overall operability.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of a shutoff mechanism and a stop valve structure of the utility model;

[0019] Figure 2 for Figure 1 A schematic diagram of a side cross-section structure;

[0020] Figure 3 for Figure 1 Schematic diagram of the local enlarged structure at A.

[0021] Figure numerals: 1. threaded valve stem; 2. turning handle; 3. retained valve core; 4. limiting ring; 5. fixing cylinder; 6. compression spring; 7. slide plate; 8. bump; 9. yielding slope; 10. pull rod; 11. handle; 12. U-shaped frame; 13. slot; 14. valve housing; 15. valve cover; 16. nut sleeve; 17. flow port. DETAILED DESCRIPTION

[0022] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0023] Embodiment 1

[0024] like Figure 1-Figure 3 As shown, a shut-off mechanism and a stop valve proposed by the utility model include a valve housing 14, a valve cover 15, a threaded valve stem 1, a check assembly and a limit drive. The top of the valve housing 14 is connected to the valve cover 15 through a flange, and a nut sleeve 16 is integrally formed on the valve cover 15. The nut sleeve 16 is internally threadedly connected to the threaded valve stem 1, a turning handle 2 is provided at the top of the threaded valve stem 1, a retaining valve core 3 is provided at the bottom, and a limit ring 4 is rotatably provided in the middle. A check assembly for limiting the limit ring 4 is provided on the valve housing 14, which has a passing position and a blocking position, and the limit drive is used to drive the check assembly to switch from the blocking position to the passing position.

[0025] like Figure 2 As shown, the check assembly includes a fixed cylinder 5, a compression spring 6, a slide plate 7 and a protrusion 8. The fixed cylinder 5 is installed on the valve housing 14. A compression spring 6 is arranged in the fixed cylinder 5. One end of the compression spring 6 is connected to the slide plate 7. The slide plate 7 is slidably connected to the fixed cylinder 5. A protrusion 8 is arranged on the side of the slide plate 7. The corners of the protrusion 8 are provided with a relief slope 9 for the limit ring 4 to be squeezed.

[0026] like Figure 2 As shown, a flow opening 17 is arranged inside the valve housing 14 , and the intercepting valve core 3 is arranged opposite to the flow opening 17 .

[0027] When the threaded valve stem 1 is rotated by turning the handle 2, the threaded valve stem 1 drives the retained valve core 3 to rotate downward relative to the threaded sleeve, and the limit ring 4 moves synchronously. During the movement, its side surface squeezes the yield slope 9 of the protrusion 8, so that the protrusion 8 squeezes the compression spring 6 through the slide plate 7 under the action of the pressing force. When the limit ring 4 passes over the protrusion 8, the retained valve core 3 blocks the flow port 17, and the protrusion 8 extends again under the action of the compression spring 6, preventing the threaded valve stem 1 from driving the limit ring 4 to move upward in the slipped state.

[0028] Embodiment 2

[0029] like Figure 1-Figure 3 As shown, a shut-off mechanism and a stop valve proposed by the utility model, based on the above embodiments, this embodiment records in detail the detailed components of the limit driving member, and the specific components thereof and the limit driving member.

[0030] like Figure 2As shown, the limit drive component includes a pull rod 10, a handle 11 and a positioning member. The pull rod 10 is installed on the side of the slide plate 7 away from the protrusion 8, and one end of the pull rod 10 passes through the fixed tube 5 and is rotatably connected to the handle 11. The end surface of the fixed tube 5 is provided with a positioning member for positioning the handle 11.

[0031] like Figure 3 As shown, the positioning member includes a U-shaped frame 12 , and a slot 13 that matches the cross-sectional shape of the handle 11 is disposed at a horizontal end of the U-shaped frame 12 .

[0032] In summary, when the utility model is in use, when it is necessary to intercept the fluid, when the threaded valve stem 1 is rotated by the turning handle 2, the threaded valve stem 1 drives the intercepting valve core 3 to rotate downward relative to the threaded sleeve until it blocks the flow port 17. At the same time, in the process of the threaded valve stem 1 and the intercepting valve core 3 descending, it drives the limit ring 4 to descend synchronously, and the side of the limit ring 4 squeezes the yielding inclined surface 9 of the protrusion 8, so that the protrusion 8 squeezes the compression spring 6 through the slide plate 7 under the action of the pressing force. When the limit ring 4 passes over the protrusion 8, the protrusion 8 extends again under the action of the compression spring 6, so as to prevent the threaded valve stem 1 from driving the limit ring 4 to move upward in the slipped state. When it is necessary to open the flow port 17, it is first necessary to release the limit on the limit ring 4, that is, manually pull the handle 11 outward, and the handle 11 drives the slide plate 7 and the protrusion 8 to move synchronously to the inside of the fixed tube 5 through the pull rod 10, and then rotate the handle 11 to 180 degrees, release the external pulling force applied to the handle 11, so that the handle 11 is inserted into the slot 13 of the U-shaped frame 12 under the action of the compression spring 6, that is, at this time, the protrusion 8 is positioned by the handle 11, so that it keeps the limit state of the limit ring 4 released, and then by rotating the handle 2 in the opposite direction, the retained valve core 3 can be driven to move upward through the threaded valve stem 1, thereby opening the flow port 17.

[0033] The implementation modes of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited thereto, and various changes can be made within the knowledge scope of technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A shut-off mechanism, characterized in that: include A threaded valve stem (1) is provided with a turning handle (2) at its top end, a retaining valve core (3) at its bottom end, and a limit ring (4) is provided in the middle for rotation; A non-return assembly, arranged on one side of the limiting ring (4), used to limit the limiting ring (4), and having a passing position and a blocking position; as well as The limit drive component is used to drive the non-return assembly to switch from the blocking position to the passing position.

2. A shut-off mechanism according to claim 1, characterized in that: The non-return assembly comprises a fixed cylinder (5), a compression spring (6), a slide plate (7) and a convex block (8); the fixed cylinder (5) is provided with a compression spring (6); one end of the compression spring (6) is connected to the slide plate (7); the slide plate (7) is slidably connected to the fixed cylinder (5); A convex block (8) is arranged on the side of the slide plate (7), and a relief inclined surface (9) for the limiting ring (4) to be squeezed is provided at the corner of the convex block (8).

3. A shut-off mechanism according to claim 2, characterized in that: The limit drive component comprises a pull rod (10), a handle (11) and a positioning component. The pull rod (10) is installed on the side of the slide plate (7) away from the protrusion (8). One end of the pull rod (10) passes through the fixed tube (5) and is rotatably connected to the handle (11). The end surface of the fixed tube (5) is provided with a positioning component for positioning the handle (11).

4. A shut-off mechanism according to claim 3, characterized in that: The positioning member comprises a U-shaped frame (12), and a clamping groove (13) which matches the cross-sectional shape of the handle (11) is arranged at the horizontal end of the U-shaped frame (12).

5. A stop valve having a shutoff mechanism according to any one of claims 1 to 4, characterized in that: The valve housing (14) comprises a valve cover (15), wherein the valve cover (15) is connected to the valve housing (14) via a flange, a nut sleeve (16) is integrally formed on the valve cover (15), and the nut sleeve (16) is threadedly connected to a threaded valve stem (1).

6. A stop valve according to claim 5, characterized in that: A flow opening (17) is arranged inside the valve housing (14), the interception valve core (3) is arranged opposite to the flow opening (17), and the valve housing (14) and the fixing cylinder (5) are integrally formed.

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