Two-stage stroke stop valve

Abstract

The utility model discloses a two-stage stroke stop valve which comprises a valve body, and two valve body inner cavities are arranged in the valve body side by side. A first valve seat and a second valve seat are sequentially arranged in an inner cavity of the valve body from right to left, and the first valve seat and the second valve seat are arranged in a spaced mode. A first valve element is arranged in a center through hole of the first valve seat in a sliding mode. A second valve element is arranged in a central through hole of the second valve seat in a sliding mode. An ejector rod for driving the first valve element and the second valve element to act is arranged at the right end of the inner cavity of the valve body in a sliding mode. Through the first valve element and the second valve element which are coaxially arranged, the sealing performance of the valve body is guaranteed through two-stage strokes of the first valve element and the second valve element when the valve is opened and closed, the problem that an existing stop valve is short in service life after sealing failure due to the fact that only one-stage sealing is arranged is solved, the sealing performance of the stop valve is improved, and the service life of the stop valve is prolonged. And the service life of the stop valve is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, specifically to a two-stage stroke shut-off valve. Background Technology

[0002] Gate valves, as one of the most important shut-off valves, can cut off and throttle the medium in their respective pipelines, playing a vital role in the aerospace field. As a crucial component of aerospace equipment, gate valves perform functions such as media transport, shut-off, and regulation, and their sealing performance directly affects the safe and reliable operation of aerospace equipment.

[0003] Currently, the sealing of gate valves is achieved by applying pressure to the valve disc in the axial direction through the valve stem, so that the valve disc sealing surface and the valve seat sealing surface are tightly fitted, preventing the medium from leaking along the gap between the sealing surfaces. In addition, existing gate valves usually use a single-stage sealing structure for sealing. Therefore, when gate valves are in long-term working conditions, they are prone to deformation and aging, resulting in poor sealing and a short service life. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a two-stage stroke shut-off valve that can improve the sealing performance of the shut-off valve and extend its service life.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows.

[0006] A two-stage stroke shut-off valve includes a valve body with two valve body cavities arranged side-by-side inside the valve body. The upper valve body cavity is connected to a first oil inlet, and the lower valve body cavity is connected to a second oil inlet. The right side of the upper valve body cavity is connected to an oil outlet. An oil outlet channel connecting the upper and lower valve body cavities is provided inside the valve body. A first valve seat and a second valve seat are arranged sequentially from right to left in the valve body cavity, with the first and second valve seats spaced apart. A first valve core is slidably disposed in the central through hole of the first valve seat to control the communication between the central through hole of the first valve seat and the valve body cavity. A second valve core is slidably disposed in the central through hole of the second valve seat to control the communication between the central through hole of the second valve seat and the valve body cavity. The left end of the first valve core is elastically connected to the left end of the second valve seat, and the left end of the second valve core is elastically connected to the left end of the valve body cavity. The right end face of the first valve core is connected to the left end face of the second valve core. A push rod for driving the first and second valve cores is slidably disposed at the right end of the valve body cavity. The left end of the push rod is connected to the end of the first valve core, and the right end of the push rod is connected to a rotating arm mounted on the valve body.

[0007] The above-mentioned two-stage stroke shut-off valve has a first valve core comprising a first horizontal portion, a first tapered portion whose outer diameter gradually decreases from left to right, and a first connecting portion arranged sequentially. The diameter of the first horizontal portion is smaller than the inner diameter of the central through hole of the first valve seat. The maximum diameter of the first tapered portion is the same as the inner diameter of the valve body cavity between the first valve seat and the second valve seat. The first tapered portion is provided with a through hole through which oil passes and enters the valve body cavity between the first valve seat and the second valve seat.

[0008] In the aforementioned two-stage stroke shut-off valve, a first spring is installed on the first connecting part, and the other end of the first spring is connected to the right end face of the second valve seat.

[0009] The above-mentioned two-stage stroke shut-off valve includes a second horizontal part, a second conical part with an outer diameter that gradually decreases from left to right, and a second connecting part arranged in sequence. The diameter of the second horizontal part is smaller than the inner diameter of the central through hole of the second valve seat, and the maximum outer diameter of the second conical part is the same as the inner diameter of the valve body cavity at the left end of the second valve seat.

[0010] In the aforementioned two-stage stroke shut-off valve, a second spring is installed on the second connection part, and the other end of the second spring is connected to a spring seat at the left end of the valve body cavity.

[0011] In the aforementioned two-stage stroke shut-off valve, the left end of the spring seat is connected to an adjusting assembly for adjusting the prestress of the second spring; the adjusting assembly includes a threaded sleeve disposed at the left end of the valve body, the spring seat is installed inside the threaded sleeve, the left end of the threaded sleeve is threadedly connected to a pressure adjusting rod, and the right end of the pressure adjusting rod is connected to the left end of the spring seat.

[0012] The technological advancements achieved by this utility model are as follows, due to the adoption of the above technical solutions.

[0013] This utility model provides a two-stage stroke gate valve. By using a first valve core and a second valve core arranged coaxially, the valve body's sealing performance is ensured through the two-stage stroke of the first and second valve cores when the valve is opened and closed. This solves the problem of short lifespan of existing gate valves due to only having a single-stage seal, thus improving the sealing performance of the gate valve and extending its service life. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the specific structure of the present utility model;

[0015] Figure 2 This is an internal sectional view of the present invention.

[0016] The components are: 1. Valve body, 2. Push rod, 3. Tilting arm, 4. First valve seat, 5. Second valve seat, 6. First valve core, 7. Second valve core, 8. First spring, 9. Second spring, 10. Spring seat, 11. Screw sleeve, 12. Pressure adjusting rod, 13. First oil inlet, 14. Second oil inlet, 15. Oil outlet, 16. Oil outlet channel, 17. Baffle. Detailed Implementation

[0017] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0018] Two-stage stop valve, such as Figures 1 to 2 As shown, the valve body includes a valve body 1, which has two valve body cavities arranged side by side. The upper valve body cavity is connected to the first oil inlet 13, and the lower valve body cavity is connected to the second oil inlet 14. The right side of the upper valve body cavity is connected to the oil outlet 15. The valve body 1 has an oil outlet channel 16 that connects the upper valve body cavity and the lower valve body cavity.

[0019] The valve body cavity is provided with a first valve seat 4 and a second valve seat 5 from right to left, and the first valve seat 4 and the second valve seat 5 are spaced apart. A first valve core 6 is slidably disposed in the central through hole of the first valve seat 4 to control the communication between the central through hole of the first valve seat 4 and the valve body cavity. A second valve core 7 is slidably disposed in the central through hole of the second valve seat 5 to control the communication between the central through hole of the second valve seat 5 and the valve body cavity.

[0020] The first valve core 6 is elastically connected to the left end of the second valve seat 5, the second valve core 7 is elastically connected to the left end of the valve body cavity, and the right end face of the first valve core 6 is connected to the left end face of the second valve core 7.

[0021] Specifically, the first valve core 6 includes a first horizontal part, a first tapered part whose outer diameter gradually decreases from left to right, and a first connecting part arranged in sequence. The diameter of the first horizontal part is smaller than the inner diameter of the central through hole of the first valve seat 4. The maximum diameter of the first tapered part is the same as the inner diameter of the valve body cavity between the first valve seat 4 and the second valve seat 5. The first tapered part is provided with a through hole for oil to pass through and enter the valve body cavity between the first valve seat 4 and the second valve seat 5.

[0022] When the outer wall of the first conical part contacts the end face of the central through hole of the first valve seat, it blocks the central through hole of the first valve seat and intercepts the medium. When the outer wall of the first conical part detaches from the central through hole of the first valve seat, the oil enters the central through hole of the first valve seat from the upper hole of the first conical part, and enters the oil outlet channel 16 along the inner cavity of the valve body and is discharged through the oil outlet 15.

[0023] A first spring 8 is installed on the first connecting part. The other end of the first spring 8 is connected to the right end face of the second valve seat 5. When the first valve core 6 moves to the left, the first connecting part compresses the first spring 8 and pushes the second valve core 8 to move to the left. At the same time, under the action of the first spring 8, the first valve core 6 can be reset and the central through hole of the first valve seat 4 is blocked.

[0024] The second valve core 7 includes a second horizontal part, a second conical part whose outer diameter gradually decreases from left to right, and a second connecting part arranged in sequence. The diameter of the second horizontal part is smaller than the inner diameter of the central through hole of the second valve seat 5, and the maximum outer diameter of the second conical part is the same as the inner diameter of the valve body cavity at the left end of the second valve seat 5.

[0025] When the outer wall of the second conical part contacts the end face of the central through hole of the second valve seat, it blocks the central through hole of the second valve seat and intercepts the medium. When the outer wall of the second conical part disengages from the central through hole of the second valve seat, the oil enters the central through hole of the second valve seat and enters the valve body cavity between the first valve seat 4 and the second valve seat 5 along the valve body cavity.

[0026] A second spring 9 is installed on the second connecting part, and the other end of the second spring 9 is connected to the spring seat 10 at the left end of the valve body cavity.

[0027] The left end of the spring seat 10 is connected to an adjustment assembly for adjusting the prestress of the second spring 9. The adjustment assembly includes a screw sleeve 11 disposed at the left end of the valve body 1. The spring seat 10 is installed inside the screw sleeve 11. The left end of the screw sleeve 11 is threadedly connected to a pressure adjusting rod 12. The right end of the pressure adjusting rod 12 is connected to the left end of the spring seat 10. The stress of the second spring 9 is adjusted by adjusting the distance between the spring seat 10 and the second valve seat 5.

[0028] A push rod 2 is slidably disposed on the right end of the valve body cavity. The left end of the push rod 2 is connected to the end of the first valve core 6, which can drive the first valve core 6 and the second valve core 7 to move. The right end of the push rod 2 is connected to the rotating arm 3 mounted on the valve body 1. The rotating arm 3 rotates and presses down the push rod 2 under the drive of the drive mechanism, so that the push rod 2 moves in the valve body cavity. The drive mechanism adopts an existing structure known to those skilled in the art, such as motor drive, which will not be described in detail here.

[0029] The valve body 1 is also provided with a baffle 17 to limit the rotation arm 3.

[0030] In use, the rotating arm 3 rotates and applies pressure to the push rod 2, causing the push rod 2 to move to the left along the inner cavity of the valve body, and pushing the first valve core 6 and the second valve core 7 to the left as a whole, so that a passage for oil to pass through is formed inside the inner cavity of the valve body. The oil enters the inner cavity of the valve body through the oil inlet, passes through the second valve seat 5 and the first valve seat 4 in sequence, and then flows into the oil outlet channel 16 and is discharged through the oil outlet 15.

[0031] When it is necessary to cut off the flow of the medium, control the rotating arm 3 to rotate and release the pressure applied to the push rod 2. At this time, the second spring 9 drives the second valve core 7 to reset, blocking the central through hole of the second valve seat 5 and completing one sealing. At the same time, the second valve core 7 pushes the first valve core 6 to move and resets under the action of the first spring 8, blocking the central through hole of the first valve seat 4 and sealing again.

[0032] This utility model provides a two-stage stroke gate valve. By using a first valve core and a second valve core arranged coaxially, the valve body's sealing performance is ensured through the two-stage stroke of the first and second valve cores when the valve is opened and closed. This solves the problem of short lifespan of existing gate valves due to only having a single-stage seal, thus improving the sealing performance of the gate valve and extending its service life.

Claims

1. A two-stage stroke shut-off valve, characterized in that: The valve body (1) includes two valve body cavities arranged side by side. The upper valve body cavity is connected to the first oil inlet (13), and the lower valve body cavity is connected to the second oil inlet (14). The right side of the upper valve body cavity is connected to the oil outlet (15). An oil outlet channel (16) is provided inside the valve body (1) to connect the upper valve body cavity and the lower valve body cavity. A first valve seat (4) and a second valve seat (5) are arranged sequentially from right to left in the valve body cavity, and the first valve seat (4) and the second valve seat (5) are spaced apart. A control mechanism for connecting the central through hole of the first valve seat (4) to the valve body cavity is slidably provided in the central through hole of the first valve seat (4). The first valve core (6); the second valve seat (5) is slidably provided with a second valve core (7) in the center through hole to control the communication between the center through hole of the second valve seat (5) and the inner cavity of the valve body; the first valve core (6) is elastically connected to the left end of the second valve seat (5), the second valve core (7) is elastically connected to the left end of the inner cavity of the valve body, and the right end face of the first valve core (6) is connected to the left end face of the second valve core (7); the right end of the inner cavity of the valve body is slidably provided with a push rod (2) to drive the first valve core (6) and the second valve core (7) to move, the left end of the push rod (2) is connected to the end of the first valve core (6), and the right end of the push rod (2) is connected to the rotating arm (3) installed on the valve body (1).

2. The two-stage stroke shut-off valve according to claim 1, characterized in that: The first valve core (6) includes a first horizontal part, a first conical part whose outer diameter gradually decreases from left to right, and a first connecting part arranged in sequence. The diameter of the first horizontal part is smaller than the inner diameter of the central through hole of the first valve seat (4). The maximum diameter of the first conical part is the same as the inner diameter of the valve body cavity between the first valve seat (4) and the second valve seat (5). The first conical part is provided with a through hole for oil to pass through and enter the valve body cavity between the first valve seat (4) and the second valve seat (5).

3. The two-stage stroke shut-off valve according to claim 2, characterized in that: A first spring (8) is installed on the first connecting part, and the other end of the first spring (8) is connected to the right end face of the second valve seat (5).

4. The two-stage stroke shut-off valve according to claim 1, characterized in that: The second valve core (7) includes a second horizontal part, a second conical part whose outer diameter gradually decreases from left to right, and a second connecting part arranged in sequence. The diameter of the second horizontal part is smaller than the inner diameter of the central through hole of the second valve seat (5). The maximum outer diameter of the second conical part is the same as the inner diameter of the valve body cavity at the left end of the second valve seat (5).

5. The two-stage stroke shut-off valve according to claim 4, characterized in that: A second spring (9) is installed on the second connecting part, and the other end of the second spring (9) is connected to the spring seat (10) at the left end of the valve body cavity.

6. The two-stage stroke shut-off valve according to claim 5, characterized in that: The left end of the spring seat (10) is connected to an adjustment assembly for adjusting the prestress of the second spring (9); the adjustment assembly includes a screw sleeve (11) disposed at the left end of the valve body (1), the spring seat (10) is installed inside the screw sleeve (11), the left end of the screw sleeve (11) is threadedly connected to a pressure adjusting rod (12), and the right end of the pressure adjusting rod (12) is connected to the left end of the spring seat (10).

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