A gate valve with double check function

Abstract

The application provides a gate valve with double check function and simple structure and capable of preventing water hammer effect, which comprises a valve body, a valve cover arranged on the valve body, a water inlet channel and a water outlet channel arranged along the radial direction of the valve body, a valve plate arranged between the water inlet channel and the water outlet channel and used for controlling the opening and closing of fluid, a rotating wheel provided with a fan blade, a valve rod arranged on the valve body, one end of the valve rod being connected with the valve plate, the other end of the valve rod penetrating out of the valve cover, a placing chamber arranged in the valve body and connected with the water inlet channel, the rotating wheel being arranged in the placing chamber, a lifting device arranged in the placing chamber and used for sliding the rotating wheel into the water inlet channel, and a hammer eliminating device arranged between the rotating wheel and the valve body and used for blocking the water hammer generated on the circumferential side of the rotating wheel.

Description

Technical Field

[0001] This invention relates to the field of valve technology, and in particular to a gate valve with dual check valve function. Background Technology

[0002] In current pipeline design, valves are required to control fluid flow. Due to specific needs, check valves are also necessary. In such cases, it's common to install both a valve body for fluid flow control and a check valve simultaneously. The installation of multiple valve bodies results in excessive connections, increases the risk of leakage, increases operator steps, raises labor costs, and reduces construction efficiency. Therefore, check valves are often directly installed within the valves themselves; gate valves with dual check functions are a common example. While they meet the requirements, gate valves can generate water hammer when closed, potentially damaging the valve plate and hindering long-term use. To address these issues, this invention was developed. Summary of the Invention

[0003] Therefore, in view of the above problems, the present invention proposes a gate valve with dual check valve function that can protect the valve plate and prevent water hammer effect.

[0004] To solve the above-mentioned technical problems, the solution adopted by the present invention is as follows: a gate valve with dual check function, including a valve body, a valve cover disposed on the valve body, an inlet channel and an outlet channel opened radially along the valve body, a valve plate disposed between the inlet channel and the outlet channel for controlling the opening and closing of fluid, a rotating wheel with fan blades, a valve stem disposed on the valve body, one end of the valve stem being connected to the valve plate, and the other end of the valve stem passing through the valve cover, a placement chamber communicating with the inlet channel being disposed on the valve body, the rotating wheel being disposed in the placement chamber, a lifting device for driving the rotating wheel to slide into the inlet channel being disposed in the placement chamber, and a hammer-eliminating device for blocking water hammer generated around the rotating wheel being disposed between the rotating wheel and the valve body.

[0005] A further improvement is that the hammer suppression device includes several water spray pipes arranged around the water inlet channel, the water spray pipes being located behind the rotating wheel, the valve body having a water spray chamber, a water supply pipe for supplying water to the water spray chamber being provided between the valve body and the water spray chamber and the water supply pipe being located in front of the rotating wheel, and a pushing device for pushing the water in the water spray chamber out of the water spray pipe being provided between the water spray chamber and the rotating wheel.

[0006] A further improvement is made to the following: the pushing device includes a pushing plate; a water-passing seat is provided in the spray chamber; a sliding rod is slidably mounted on the water-passing seat; the pushing plate is located at one end of the sliding rod; a limiting block is provided at the other end of the sliding rod to prevent the sliding rod from disengaging from the water-passing seat; a first rotating rod is rotatably mounted in the spray chamber; an eccentric wheel is mounted on the first rotating rod; the eccentric wheel resists the pushing plate; a linkage device is provided between the first rotating rod and the rotating wheel; and a reset device is also provided between the pushing plate and the water-passing seat.

[0007] A further improvement is that the linkage device includes a linkage block, which is rotatably mounted on the valve body. The rotating rod is located at the other end of the eccentric wheel and connected to the linkage block. The rotating wheel is provided with a square locking rod, and the linkage block is provided with a square locking groove. The locking rod passes through the locking groove.

[0008] A further improvement is made to the lifting device, which includes a lifting block, a rotating wheel rotatably mounted on the lifting block, symmetrically arranged limit rods on the periphery of the lifting block, a limit channel in the placement chamber, a limit rod slidably mounted in the limit channel, a screw rotatably mounted in the placement chamber, the screw threadedly passing through the lifting block and engaging with the lifting block threadedly, and a rotating device on the valve body for driving the screw to rotate.

[0009] A further improvement is that the rotating device includes a first bevel tooth and a second bevel tooth. The first bevel tooth is disposed on the screw. A second rotating rod is rotatably disposed on the valve body. The second bevel tooth is disposed at the end of the second rotating rod and meshes with the first bevel tooth for transmission. A third bevel tooth is disposed at the other end of the second rotating rod. A fourth bevel tooth is disposed on the valve rod. The third bevel tooth meshes with the fourth bevel tooth for transmission.

[0010] A further improvement is that the reset device is a spring, which is sleeved between the push plate and the water-passing seat.

[0011] A further improvement is that the water supply pipe is equipped with a one-way valve and a filter screen at the water inlet channel, with the filter screen located above the one-way valve.

[0012] A further improvement is that the water spray pipe has a horizontal spray nozzle that is opposite to the water inlet direction, and the water spray pipe has a vertical spray nozzle that is perpendicular to the water inlet channel.

[0013] A further improvement is that the valve body is provided with a sealing cover for sealing the first rotating rod.

[0014] By adopting the aforementioned technical solution, the beneficial effects of the present invention are: It can prevent water hammer, protect the valve plate, and extend its service life. When water hammer enters the inlet channel, it drives the rotating wheel to rotate. The rotating wheel blocks the water hammer and dissipates its energy, thus reducing the water hammer effect. As the rotating wheel rotates, it also drives the spray pipes to spray water. When the water flows out from the horizontal spray nozzles, it collides with the water hammer around both ends of the rotating wheel, thus dissipating its energy. The water sprayed from the vertical spray nozzles creates a ring-shaped "water wall," further dissipating the energy of the backward-flowing water, thus further reducing water hammer and protecting the valve plate. When the gate valve is opened, the valve stem reverses, causing the screw to reverse, raising the rotating wheel into the placement chamber. This prevents the rotating wheel from interfering with the water flow through the gate valve, facilitating valve operation. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the cross-sectional structure of a gate valve with dual check valve function according to an embodiment of the present invention.

[0016] Figure 2 This is a cross-sectional view of embodiment A of the present invention. Detailed Implementation

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

[0018] refer to Figure 1-2The present invention discloses a gate valve with dual check valve function, comprising a valve body 1 made of stainless steel, a valve cover disposed on the valve body 1, an inlet channel 2 and an outlet channel radially opened along the valve body 1, a valve plate 3 disposed between the inlet channel 2 and the outlet channel for controlling the opening and closing of fluid, and a rotating wheel 13 with fan blades. A valve stem 4 is disposed on the valve body 1, one end of which is connected to the valve plate 3, and the other end of which extends through the valve cover. A placement chamber 10 communicating with the inlet channel 2 is provided on the valve body 1. The rotating wheel 13 is disposed within the placement chamber 10. A lifting block 12 is provided within the placement chamber 10 to drive the rotating wheel 13 into the inlet channel 2. The rotating wheel 13 is rotatably mounted on the lifting block 12. Limiting rods (not shown in the figure) are symmetrically provided on the periphery of the lifting block 12. (Illustrated) The placement chamber 10 has a limiting channel, and the limiting rod is slidably disposed in the limiting channel. A screw 11 is rotatably disposed in the placement chamber. The screw 11 is threaded through the lifting block 12 and is threadedly driven by the lifting block 12. The valve body 1 is provided with a first bevel tooth 9 and a second bevel tooth 8 for driving the screw 11 to rotate. The first bevel tooth 9 is disposed on the screw 11. A second rotating rod 7 is rotatably disposed on the valve body 1. The second bevel tooth 8 is disposed at the end of the second rotating rod 7 and meshes with the first bevel tooth 9. A third bevel tooth 6 is disposed at the other end of the second rotating rod 7. A fourth bevel tooth 5 is disposed on the valve stem 4. The third bevel tooth 6 meshes with the fourth bevel tooth 5. A hammer-eliminating device for blocking water hammer generated around the rotating wheel 13 is also provided between the rotating wheel 13 and the valve body 1.

[0019] Specifically, the hammer suppression device includes multiple water spray pipes 14 arranged around the water inlet channel 2. Each water spray pipe 14 has a transverse spray nozzle opposite to the water inlet direction and a longitudinal spray nozzle perpendicular to the water inlet channel 2. The water spray pipes 14 are located behind the rotating wheel 13. A water spray chamber 18 is provided on the valve body 1. A water supply pipe 17 for supplying water to the water spray chamber 18 is provided between the valve body 1 and the water spray chamber 18, and the water supply pipe 17 is located in front of the rotating wheel 13. A push plate 21 for pushing water 25 out of the water spray chamber 18 and spraying it out from the water spray pipes 14 is provided between the water spray chamber 18 and the rotating wheel 13. A water passage seat 23 is provided inside the water spray chamber 18, and a sliding rod 24 is slidably mounted on the water passage seat 23. The push plate 21 is mounted on the sliding rod 24. At the end of 4, the other end of the sliding rod 24 is provided with a limiting block to prevent the sliding rod 24 from disengaging from the water seat 23. A first rotating rod 19 is rotatably provided in the spray chamber 18. An eccentric wheel 20 is provided on the first rotating rod 19. The eccentric wheel 20 resists the push plate 21. A connecting block 15 is provided between the first rotating rod 19 and the rotating wheel 13. The connecting block 15 is rotatably provided on the valve body 1. The other end of the first rotating rod 19 is connected to the connecting block 15. A square locking rod 16 is provided on the rotating wheel 13. A square locking groove is opened on the connecting block 15. The locking rod 16 passes through the locking groove. A spring 22 is also provided between the push plate 21 and the water seat 23. The spring 22 is sleeved between the push plate 21 and the water seat 23.

[0020] In order to better facilitate water intake and prevent blockage of the water supply pipe 17, the water supply pipe 17 is equipped with a one-way valve and a filter screen at the water inlet channel 2, and the filter screen is located above the one-way valve.

[0021] In order to better seal the first rotating rod 19, the valve body 1 is provided with a sealing cover for sealing the first rotating rod 19.

[0022] Working principle: In use, when the gate valve is closed, rotating the valve stem 4 causes the valve plate 3 to close the gate valve. Simultaneously, as the valve stem 4 rotates, it drives the fourth bevel gear 5 to rotate, which in turn drives the third bevel gear 6 to rotate. The third bevel gear 6 drives the second rotating rod 7 to rotate, which in turn drives the second bevel gear 8 to rotate, and the second bevel gear 8 drives the first bevel gear 9 to rotate. This, in turn, drives the screw 11 to rotate. The screw 11 is threadedly driven by the lifting block 12, causing the lifting block 12 to slide downwards. This, in turn, drives the rotating wheel 13 downwards into the water inlet channel 2. The engaging rod 16 on the rotating wheel 13 engages with the engaging groove on the connecting block 15. At this time, the water hammer enters the water inlet channel 2, impacting the blades on the rotating wheel 13 and causing it to rotate. The rotating wheel 13 blocks the water hammer and dissipates its energy. The water hammer drives the rotating wheel 13 to rotate, which in turn drives the locking rod 16 to rotate. The locking rod 16 then drives the connecting block 15 to rotate, which in turn drives the first rotating rod 19 to rotate. The first rotating rod 19 then drives the eccentric wheel 20 to rotate. The rotation of the eccentric wheel 20 gradually pushes the push plate 21 to slide. The sliding of the push plate 21 pushes the water in the spray chamber 18 to spray water from the spray pipe 14. When the water flows out from the horizontal spray nozzle, it collides with the water hammer around both ends of the rotating wheel 13, thereby dissipating the energy of the water hammer. Meanwhile, the water sprayed from the vertical spray nozzle creates a ring-shaped "water wall," which dissipates the energy of the backward-flowing water, further reducing the water hammer and protecting the valve plate 3. When the gate valve is opened, the valve stem 4 is reversed, which drives the screw 11 to reverse, thereby raising the rotating wheel 13 into the placement chamber 10 and preventing the rotating wheel 13 from affecting the water flow through the gate valve.

[0023] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions above are merely illustrative of the principles of the present invention. Various changes and modifications can be made to the present invention without departing from its spirit and scope. All such changes and modifications fall within the scope of the present invention as claimed, which is defined by the appended claims and their equivalents.

Claims

1. A gate valve with dual check function, comprising a valve body, a valve cover disposed on the valve body, an inlet channel and an outlet channel radially formed along the valve body, and a valve plate disposed between the inlet channel and the outlet channel for controlling fluid opening and closing, wherein a valve stem is provided on the valve body, one end of the valve stem is connected to the valve plate, and the other end of the valve stem extends through the valve cover, characterized in that: It also includes a rotating wheel with fan blades. The valve body has a placement chamber connected to the water inlet channel. The rotating wheel is located in the placement chamber, which has a lifting device for sliding the rotating wheel into the water inlet channel. A hammer-eliminating device is also provided between the rotating wheel and the valve body to prevent water hammer generated around the rotating wheel. The hammer-eliminating device includes several water spray pipes arranged around the water inlet channel, with the water spray pipes located behind the rotating wheel. The valve body has a water spray chamber, and a water supply pipe for supplying water to the water spray chamber is provided between the valve body and the water spray chamber, with the water supply pipe located in front of the rotating wheel. A pushing device is provided between the water chamber and the rotating wheel to push the water in the spray chamber out of the spray pipe; the pushing device includes a pushing plate, a water-passing seat is provided in the spray chamber, a sliding rod is slidably provided on the water-passing seat, the pushing plate is provided at the end of the sliding rod, a limiting block is provided at the other end of the sliding rod to prevent the sliding rod from disengaging from the water-passing seat, a first rotating rod is rotatably provided in the spray chamber, an eccentric wheel is provided on the first rotating rod, the eccentric wheel resists the pushing plate, a linkage device is provided between the first rotating rod and the rotating wheel, and a reset device is also provided between the pushing plate and the water-passing seat.

2. A gate valve with dual check function according to claim 1, characterized in that: The linkage device includes a linkage block, which is rotatably mounted on the valve body. The rotating rod is located at the other end of the eccentric wheel and connected to the linkage block. The rotating wheel is provided with a square locking rod, and the linkage block is provided with a square locking groove. The locking rod passes through the locking groove.

3. A gate valve with dual check function according to claim 1, characterized in that: The lifting device includes a lifting block, a rotating wheel rotatably mounted on the lifting block, and symmetrically arranged limiting rods on the periphery of the lifting block. The placement chamber has a limiting channel, and the limiting rods are slidably mounted in the limiting channel. A screw is rotatably mounted in the placement chamber, and the screw thread passes through the lifting block and is threadedly driven by the lifting block. The valve body is provided with a rotating device for driving the screw to rotate.

4. A gate valve with dual check function according to claim 3, characterized in that: The rotating device includes a first bevel tooth and a second bevel tooth. The first bevel tooth is disposed on the screw. A second rotating rod is rotatably disposed on the valve body. The second bevel tooth is disposed at the end of the second rotating rod and meshes with the first bevel tooth for transmission. A third bevel tooth is disposed at the other end of the second rotating rod. A fourth bevel tooth is disposed on the valve rod. The third bevel tooth meshes with the fourth bevel tooth for transmission.

5. A gate valve with dual check function according to claim 1, characterized in that: The reset device is a spring, which is sleeved between the push plate and the water-passing seat.

6. A gate valve with dual check function according to claim 1, characterized in that: The water supply pipe is equipped with a one-way valve and a filter screen at the water inlet channel, with the filter screen located above the one-way valve.

7. A gate valve with dual check function according to claim 1, characterized in that: The water spray pipe has a horizontal spray nozzle opposite to the water inlet direction, and a vertical spray nozzle perpendicular to the water inlet channel.

8. A gate valve with dual check function according to claim 1, characterized in that: The valve body is provided with a sealing cover for sealing the first rotating rod.

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