A backflow prevention stop valve

Abstract

The utility model provides a kind of anti-return stop valve with simple structure and long service life, including valve body, be located on the valve cover of valve body, the water inlet channel and water outlet channel are opened in the valve body, valve seat is equipped between the water inlet channel and water outlet channel, valve rod is equipped on the valve body, one end of the valve rod is equipped with valve plate for sealing valve seat, the other end of the valve rod is worn out valve cover, the inner wall of water outlet channel is equipped with the stop seat that can make water flow pass, rotating rod is rotatably equipped in the inner wall of water outlet channel, stop plate is equipped on the rotating rod, rotating device is equipped on the valve body, drives rotating rod to rotate to make stop plate seal stop seat.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, and in particular to an anti-backflow shut-off valve. Background Technology

[0002] Gate valves, also known as stop valves, are among the most widely used valves. Their popularity stems from the low friction between the sealing surfaces during opening and closing, resulting in durability. They also have a small opening height, are easy to manufacture and maintain, and are suitable for both low and medium pressures as well as high pressures. The closing principle of a gate valve relies on the pressure of the valve stem to ensure a tight seal between the valve disc and valve seat, preventing the flow of media. While existing gate valves meet the requirements, backflow of media after shut-off can damage the valve stem and valve disc, affecting their service life.

[0003] This utility model was developed to solve this problem. Utility Model Content

[0004] Therefore, in view of the above problems, this utility model proposes a backflow prevention shut-off valve with simple structure and long service life.

[0005] To solve the above-mentioned technical problems, the solution adopted by this utility model is as follows: a backflow prevention shut-off valve, including a valve body and a valve cover disposed on the valve body, the valve body having an inlet channel and an outlet channel, a valve seat being disposed between the inlet channel and the outlet channel, a valve stem being disposed on the valve body, a valve plate being disposed at one end of the valve stem for sealing the valve seat, and the other end of the valve stem extending through the valve cover, a shut-off seat being disposed on the inner wall of the outlet channel for allowing water to flow through, a rotating rod being rotatably disposed on the inner wall of the outlet channel, a shut-off plate being disposed on the rotating rod, and a rotating device being disposed on the valve body for driving the rotating rod to rotate so that the shut-off plate seals the shut-off seat.

[0006] A further improvement is made to the following: the rotating device includes a worm gear and a worm, the valve body has a drive channel, one end of the rotating rod passes through the drive channel, the worm gear is fixedly sleeved on the rotating rod, the worm rotates through the valve body, one end of the worm meshes with the worm gear for transmission, and the other end of the worm passes through the valve body and is provided with a handle.

[0007] A further improvement is that the valve seat is provided with a filter screen for filtering impurities, the filter screen is provided with a sliding block, the valve seat is provided with a sliding channel, the sliding block is slidably disposed in the sliding channel, and an elastic element is provided in the sliding channel.

[0008] A further improvement is that a first magnetic ring is provided inside the valve seat above the sliding channel, and the sliding block has a magnetic force that repels the first magnetic ring.

[0009] A further improvement is that a second magnetic ring is provided inside the valve plate, and the second magnetic ring has a magnetic force that attracts the first magnetic ring.

[0010] By adopting the aforementioned technical solution, the beneficial effects of this utility model are: It features a simple structure and long service life. During use, the stop plate seals the stop seat, preventing backflow and damage to the valve plate and stem. Simultaneously, the stop plate's seal also prevents liquid backflow in industrial applications, improving production safety. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of an anti-backflow shut-off valve according to an embodiment of this utility model.

[0012] Figure 2 This is an enlarged structural schematic diagram of embodiment A of this utility model.

[0013] Figure 3 This is a schematic diagram of the rotating device structure according to an embodiment of the present invention.

[0014] Figure 4 This is an enlarged structural schematic diagram of embodiment B of this utility model. Detailed Implementation

[0015] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0016] refer to Figure 1-4The present invention discloses the following embodiments: A backflow prevention shut-off valve includes a valve body 1 and a valve cover disposed on the valve body 1. The valve body 1 has an inlet channel 2 and an outlet channel 3. A valve seat is disposed between the inlet channel 2 and the outlet channel 3. The valve body 1 has a valve stem 4. One end of the valve stem 4 has a valve plate 5 for sealing the valve seat. The other end of the valve stem 4 extends through the valve cover. The inner wall of the outlet channel 3 has a shut-off seat 6 that allows water to flow through. A rotating rod 8 is rotatably disposed on the inner wall of the outlet channel 3. A shut-off plate 7 is disposed on the rotating rod 8. The valve body 1 has a worm gear 9 and a worm 10 that drive the rotating rod 8 to rotate so that the shut-off plate 7 seals the shut-off seat 6. The valve body 1 has a drive channel. One end of the rotating rod 8 extends into the drive channel. The worm gear 9 is fixedly sleeved on the rotating rod 8. The worm 10 rotatably extends through the valve body 1. One end of the worm 10 meshes with the worm gear 9 for transmission. The other end of the worm 10 extends through the valve body 1 and has a handle. In operation, when the shut-off valve needs to be closed, the worm gear 10 is rotated. The worm gear 10 drives the worm wheel 9 to rotate, which in turn drives the rotating rod 8 to rotate, thereby rotating the shut-off plate 7. The shut-off plate 7 rotates to the shut-off seat 6 position, sealing the shut-off seat 6. Then, the shut-off valve is closed, thus preventing backflow and damage to the valve plate 5 and valve stem 4. At the same time, the shut-off plate 7 sealing the shut-off seat 6 also prevents liquid backflow in industrial applications, which helps improve production safety.

[0017] To filter impurities and prevent them from adhering to the inside of the valve body 1, valve plate 5, and valve stem 4, and to reduce water hammer damage to the filter screen 11 and valve plate 5 during opening and closing, a filter screen 11 is provided on the valve seat. A sliding block 12 is provided on the filter screen 11, and a sliding channel is provided on the valve seat. The sliding block 12 slides within the sliding channel, and a spring 13 is provided within the sliding channel. One end of the spring 13 is connected to the sliding block 12, and the other end is connected to the inner wall of the sliding channel. During use, the filter screen 11 filters impurities, preventing them from entering the valve body 1 and corroding the valve plate 5 and valve stem 4, thus extending the valve's service life. When water hammer comes into contact with the filter screen 11, it pushes the filter screen 11 to slide, compressing the spring 13. The compressed spring 13 reduces the impact force of the water hammer, minimizing its effect on the filter screen 11 and valve plate 5, thereby protecting them.

[0018] To further reduce the water hammer effect, a first magnetic ring 14 is provided inside the valve seat above the sliding channel, and the sliding block 12 has a magnetic force that repels the first magnetic ring 14. When the sliding block 12 slides upward, the magnetic force between the sliding block 12 and the first magnetic ring 14 repels, thus hindering its upward sliding. This makes it necessary to exert more force to push it upward, thereby further hindering the water hammer effect.

[0019] To ensure a better seal between the valve plate 5 and the valve seat, a second magnetic ring 15 is provided inside the valve plate 5. The second magnetic ring 15 has a magnetic attraction to the first magnetic ring 14. The magnetic attraction between the first magnetic ring 14 and the second magnetic ring 15 allows the valve plate 5 to seal more tightly against the valve seat, thus achieving a better seal.

[0020] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions above are only illustrative of the principles of this utility model. Various changes and modifications may be made to this utility model without departing from the spirit and scope of this utility model. All such changes and modifications fall within the scope of protection of this utility model as defined by the appended claims and their equivalents.

Claims

1. A backflow prevention shut-off valve, comprising a valve body and a valve cover disposed on the valve body, wherein the valve body has an inlet channel and an outlet channel, a valve seat is disposed between the inlet channel and the outlet channel, a valve stem is disposed on the valve body, one end of the valve stem is provided with a valve plate for sealing the valve seat, and the other end of the valve stem extends through the valve cover, characterized in that: The inner wall of the water outlet channel is provided with a stop seat that allows water to flow through. A rotating rod is rotatably provided on the inner wall of the water outlet channel. A stop plate is provided on the rotating rod. The valve body is provided with a rotating device that drives the rotating rod to rotate so that the stop plate seals the stop seat.

2. The anti-backflow shut-off valve according to claim 1, characterized in that: The rotating device includes a worm gear and a worm. The valve body has a drive channel. One end of the rotating rod passes through the drive channel. The worm gear is fixedly sleeved on the rotating rod. The worm rotates through the valve body. One end of the worm meshes with the worm gear for transmission. The other end of the worm passes through the valve body and is provided with a handle.

3. The anti-backflow shut-off valve according to claim 1, characterized in that: The valve seat is provided with a filter screen for filtering impurities, and a sliding block is provided on the filter screen. A sliding channel is provided on the valve seat, and the sliding block is slidably disposed in the sliding channel. An elastic element is provided in the sliding channel.

4. The anti-backflow shut-off valve according to claim 3, characterized in that: The valve seat contains a first magnetic ring located above the sliding channel, and the sliding block has a magnetic force that repels the first magnetic ring.

5. The anti-backflow shut-off valve according to claim 4, characterized in that: The valve plate is provided with a second magnetic ring, which has a magnetic force that attracts the first magnetic ring.

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