Quick opening and closing stop valve

Abstract

The utility model discloses a quick opening and closing stop valve which comprises a valve body, a valve cover, a valve rod and a valve disc, a support arm is arranged on the valve cover, a valve rod control disc is hinged to the upper end of the support arm, the valve rod control disc is a disc-shaped cam, the hinged axis between the valve rod control disc and the support arm is perpendicular to the end face of the valve rod control disc, and the valve rod control disc is a disc-shaped cam. An opening and closing operation rod is mounted on the valve rod control disc; the valve rod is inserted into the valve cover in a vertically movable mode through a sealing device, the valve rod control disc is located above the valve rod, a valve rod lifting spring is arranged between the valve rod and the valve cover, and the top face of the valve rod is attached to the peripheral face of the valve rod control disc in a tangent mode under the action of the valve rod lifting spring. The stop valve capable of being rapidly opened and closed can be rapidly opened and closed, and the requirement for rapidly cutting off or starting medium conveying is met.

Description

Technical Field

[0001] The utility model relates to a valve, in particular to an improvement on the opening and closing mode of a stop valve. Background Art

[0002] The stop valve is an extremely important shutoff valve. The sealing pair of the stop valve is composed of the valve disc sealing surface and the valve seat sealing surface. The valve stem seal that drives the valve disc is supported on the valve cover. The valve stem is rotated through the spiral mechanism to make the valve stem move up and down, driving the valve disc to move vertically along the center line of the valve seat, thereby controlling the opening and closing of the stop valve. The stop valve has good sealing performance. There is no relative sliding between the valve disc and the valve body sealing surface when opening and closing, so the wear and abrasion are not serious, and the service life is long. It is widely used. However, since the opening and closing of the stop valve is achieved by moving the valve stem up and down through the spiral mechanism, it cannot be opened and closed quickly, and cannot be used in some occasions where it is necessary to quickly cut off or open the medium delivery. Utility Model Content

[0003] In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the utility model is to provide a fast opening and closing stop valve, which can realize fast opening and closing and meet the requirements of fast cutting off or opening medium transportation.

[0004] In order to solve the above technical problems, the utility model provides a quick opening and closing stop valve, including a valve body, a valve cover, a valve stem and a valve disc, a support arm is provided on the valve cover, a valve stem control disc is hinged at the upper end of the support arm, the valve stem control disc is a disc-shaped cam, the hinge axis between the valve stem control disc and the support arm is perpendicular to the end face of the valve stem control disc, an opening and closing operating lever is installed on the valve stem control disc; the valve stem can be movably inserted into the valve cover up and down through a sealing device, the valve stem control disc is located above the valve stem, a valve stem lifting spring is provided between the valve stem and the valve cover, and the top surface of the valve stem is tangent to the outer peripheral surface of the valve stem control disc under the action of the valve stem lifting spring.

[0005] After adopting the above technical scheme, the valve stem that operates the valve disc to move up and down to realize the opening and closing of the stop valve is tangent to the outer peripheral surface of the valve stem control disc under the action of the valve stem lifting spring. Pulling the opening and closing operating lever can make the valve stem control disc rotate around the hinge axis between it and the support arm, so that the axial distance between the tangent point where the valve stem and the outer peripheral surface of the valve stem control disc fit to the hinge axis of the valve stem control disc and the support arm changes, and the valve stem moves up and down accordingly, thereby controlling the opening and closing of the valve disc. The lift angle of the disc-shaped cam serving as the valve stem control disc is usually about 90 degrees, and its lift corresponds to the opening and closing stroke of the valve disc. That is to say, as long as the opening and closing operating lever is turned about 90 degrees, the valve stem can be driven to open and close the valve disc. The opening and closing process is fast and quick, meeting the requirements of quickly cutting off or opening the medium delivery.

[0006] In a preferred embodiment of the utility model, the valve stem control disk is a disk, and the hinge axis between the disk and the support arm is parallel to the central axis of the disk and is eccentrically arranged. In this embodiment, the eccentrically installed disk is a special disk-shaped cam, which is used as the valve stem control disk, and is easy to manufacture and can meet the use requirements.

[0007] In another preferred embodiment of the utility model, a control disk installation groove is provided at the upper end of the support arm, the width of the control disk installation groove corresponds to the thickness of the valve stem control disk, and the valve stem control disk is inserted into the control disk installation groove. With this embodiment, the valve stem control disk is firmly installed and the operation is stable.

[0008] In another preferred embodiment of the utility model, a pressure plate is provided at the top of the valve stem, and the upper surface of the pressure plate is tangent to and fits the outer peripheral surface of the valve stem control disk. With this embodiment, the pressure plate can have high hardness and wear resistance, which can ensure the service life of the valve stem.

[0009] In a further preferred embodiment of the utility model, the valve stem lifting spring is a compression spring sleeved on the valve stem. In this embodiment, the compression spring sleeved on the valve stem is used as the valve stem lifting spring, which has a compact structure and stable spring operation.

[0010] In another further preferred embodiment of the utility model, the hinge axis between the valve stem control disc and the support arm intersects the axis of the valve stem perpendicularly. With this embodiment, the force point of the valve stem control disc in the process of applying force to the valve stem can be finally located near the axis of the valve stem, so that the valve stem can work stably.

[0011] In another preferred embodiment of the utility model, when the stop valve is closed, the angle α between the line OA connecting the tangent point A on the top surface of the valve stem and the outer peripheral surface of the valve stem control disk and the hinge center point O of the valve stem control disk and the valve stem center line is less than 5°. With this embodiment, it can be ensured that when the stop valve is closed, the valve stem control disk is in a self-locking state without the need for other locking mechanisms, which is more conducive to the rapid opening and closing of the stop valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The quick opening and closing stop valve of the utility model is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0013] Figure 1 This is a structural schematic diagram of a specific implementation of the utility model quick opening and closing stop valve;

[0014] Figure 2 yes Figure 1 A partial view of the structure shown.

[0015] In the figure: 1-valve stem control disk, 2-support arm, 3-pressure plate, 4-valve stem lifting spring, 5-opening and closing operating lever, 6-valve stem, 7-sealing device, 8-valve cover, 9-valve disk, 10-valve body, 11-control disk mounting groove. DETAILED DESCRIPTION

[0016] exist Figure 1 In the quick opening and closing stop valve shown in the figure, the valve cover 8 is installed on the upper side of the valve body 10, and a support arm 2 is provided on the valve cover 8. The support arm 2 extends upward from the side of the valve cover 8 to the top of the valve cover 8. A valve stem control disk 1 is hinged at the upper end of the support arm 2. The valve stem control disk 1 is a disc-shaped cam. The hinge axis between the valve stem control disk 1 and the support arm 2 is perpendicular to the end face of the valve stem control disk 1. As a preferred embodiment, the valve stem control disk 1 is a disc. The hinge axis between the disc and the support arm 2 is parallel to the central axis of the disc and is eccentrically arranged. See Figure 2 A control panel mounting groove 11 is provided at the upper end of the support arm 2. The width of the control panel mounting groove 11 corresponds to the thickness of the valve stem control panel 1. The valve stem control panel 1 is inserted into the control panel mounting groove 11. An opening and closing operating rod 5 is installed on the valve stem control panel 1 to drive the valve stem control panel 1 to rotate.

[0017] A valve stem 6 is movably inserted into the valve cover 8 through a sealing device 7. The sealing device is preferably a rubber sealing ring located between the outer periphery of the valve stem 6 and the valve cover 8. A valve disc 9 is connected to the lower end of the valve stem 6 and is located in the inner cavity of the valve body 10. The lower end surface of the valve disc 9 and the corresponding surface of the sealing seat installed in the valve body 10 form a sealing pair. A valve stem lifting spring 4 is provided between the valve stem 6 and the valve cover 8. The valve stem lifting spring 4 is preferably a compression spring sleeved on the valve stem 6. The valve stem control disk 1 is located above the valve stem 6. The top surface of the valve stem 6 is tangent to the outer peripheral surface of the valve stem control disk 1 under the action of the valve stem lifting spring 4. As a preferred embodiment, a pressure plate 3 is provided at the top of the valve stem 6. The pressure plate 3 has high hardness and wear resistance. It can be installed and connected to the valve stem 6 by connecting screws for easy replacement. The top surface of the valve stem 6 is tangent to the outer peripheral surface of the valve stem control disk 1 through the upper surface of the pressure plate 3. The outer diameter of the pressure plate 3 is larger than the diameter of the valve stem 6 body, which is convenient for the installation of the valve stem lifting spring 4; the hinge axis between the valve stem control disk 1 and the support arm 2 intersects the axis of the valve stem 6 perpendicularly, and the valve stem control disk 1 can be rotated by pressing down the opening and closing operating rod 5. At this time, the part where the valve stem control disk 1 is tangent to the top surface of the valve stem 6 is in the lift section of the disc cam, and the lift of the disc cam corresponds to the stroke required for the opening and closing of the valve cover 9. The rotation of the valve stem control disk 1 will drive the valve stem 6 downward to drive the valve disk 9 to contact the sealing seat and close the stop valve. In the closed state of the stop valve, the angle α between the line OA connecting the tangent point A on the top surface of the valve stem 6 that is tangent to the outer peripheral surface of the valve stem control disk 1 and the hinge center point O of the valve stem control disk 1 and the center line of the valve stem 6 is less than 5°; when the opening and closing operating rod 5 is pulled in the opposite direction, the valve stem 6 will move upward under the action of the valve stem lifting spring 4 to open the stop valve, and its opening and closing process is fast and quick.

[0018] The above only lists some preferred embodiments of the present invention, but the present invention is not limited thereto, and many improvements and changes can be made. As long as the improvements and changes are made on the basis of the basic principles of the present invention, they should be regarded as falling within the scope of protection of the present invention.

Claims

1. A quick opening and closing stop valve, comprising a valve body (10), a valve cover (8), a valve stem (6) and a valve disc (9), characterized in that: A support arm (2) is provided on the valve cover (8), and a valve stem control disk (1) is hinged at the upper end of the support arm (2). The valve stem control disk (1) is a disc-shaped cam. The hinge axis between the valve stem control disk (1) and the support arm (2) is perpendicular to the end surface of the valve stem control disk (1), and an opening and closing operating rod (5) is installed on the valve stem control disk (1); the valve stem (6) can be movably inserted into the valve cover (8) up and down through a sealing device (7), and the valve stem control disk (1) is located above the valve stem (6). A valve stem lifting spring (4) is provided between the valve stem (6) and the valve cover (8), and the top surface of the valve stem (6) is tangent to and fits with the outer peripheral surface of the valve stem control disk (1) under the action of the valve stem lifting spring (4).

2. The quick opening and closing stop valve according to claim 1 is characterized in that: The valve stem control disc (1) is a disc, and the hinge axis between the disc and the support arm (2) is parallel to the central axis of the disc and is eccentrically arranged.

3. The quick opening and closing stop valve according to claim 1 or 2, characterized in that: A control disk mounting groove (11) is provided at the upper end of the support arm (2); the width of the control disk mounting groove (11) corresponds to the thickness of the valve stem control disk (1); and the valve stem control disk (1) is inserted into the control disk mounting groove (11).

4. The quick opening and closing stop valve according to claim 1 is characterized in that: A pressure plate (3) is provided at the top end of the valve stem (6), and the upper surface of the pressure plate (3) is tangentially fitted to the outer peripheral surface of the valve stem control disk (1).

5. The quick opening and closing stop valve according to claim 1 is characterized in that: The valve stem lifting spring (4) is a compression spring sleeved on the valve stem (6).

6. The quick opening and closing stop valve according to claim 1 is characterized in that: The hinge axis between the valve stem control disc (1) and the support arm (2) intersects perpendicularly with the axis of the valve stem (6).

7. The quick opening and closing stop valve according to claim 1 or 6, characterized in that: When the stop valve is in the closed state, the angle α between the line OA connecting the tangent point A on the top surface of the valve stem (6) that is tangent to the outer peripheral surface of the valve stem control disk (1) and the hinge center point O of the valve stem control disk (1) and the center line of the valve stem (6) is less than 5°.

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