Backflow prevention valve

Abstract

The invention relates to the technical field of fluid control equipment, and discloses an anti-backflow valve which comprises a valve body, a valve rod, a sealing valve seat and a valve plate, an output pipe is arranged on the outer wall of the right side of the valve body, an input pipe is arranged at the bottom of the valve body, the sealing valve seat is fixedly installed in the input pipe, and the valve plate is pressed on the sealing valve seat. The valve rod is rotated to drive the connecting disc to rise, the spring drags the valve plate to rise, the valve plate is separated from the sealing valve seat, the inserting rod is arranged, on one hand, the valve plate is guided, on the other hand, when the valve needs to be closed, the valve rod can drive the inserting rod to move downwards, and then the valve plate is tightly pressed on the sealing valve seat; if the water pressure in the input pipe is lower than the water pressure in the valve cavity of the valve body, the pressure acting on the upper surface of the valve plate can downwards press the valve plate at the moment, then the valve plate is pressed on the sealing valve seat, the valve is closed, and then the backflow problem is avoided.

Description

Technical Field

[0001] This invention relates to the field of fluid control equipment technology, specifically to an anti-backflow valve. Background Technology

[0002] In existing fluid transport systems, anti-backflow valves play a crucial role. Traditional anti-backflow valves, such as gravity check valves, typically rely on the weight of the valve disc to close and prevent fluid backflow. However, these valves suffer from several problems during use. On the one hand, when the fluid flow rate is low, the valve disc may not close in time, leading to a small amount of fluid backflow. On the other hand, after prolonged use, wear can easily occur between the valve disc and the valve seat, reducing sealing performance and significantly diminishing the anti-backflow effect. Furthermore, while some complex anti-backflow valves offer good anti-backflow performance, their complex structure, high manufacturing cost, and difficult maintenance limit their widespread application. Therefore, there is an urgent need to design a valve with a simple structure, good sealing performance, and reliable anti-backflow effect. Summary of the Invention

[0003] The purpose of this invention is to provide an anti-backflow valve to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: an anti-backflow valve, comprising a valve body, a valve stem, a sealing valve seat, and a valve plate, wherein an output pipe is provided on the right outer wall of the valve body, an input pipe is provided at the bottom of the valve body, the sealing valve seat is fixedly installed in the input pipe, the valve plate is pressed on the sealing valve seat, and an anti-backflow mechanism is provided between the valve plate, the valve body, and the valve cavity.

[0005] The anti-backflow mechanism includes a connecting plate, a plug rod, and an elastic guide component. The connecting plate is fixedly sleeved on the valve stem, and the plug rod is fixedly installed at the bottom end of the valve stem. The plug rod is slidably inserted into a groove on the top of the valve plate, and a ceramic ring is fixedly installed in the groove. The ceramic ring is slidably sleeved on the plug rod. A spring is fixedly installed at the bottom of the connecting plate, and the bottom end of the spring is fixedly connected to the top of the valve plate. The elastic guide component is disposed in the valve cavity of the valve body and is close to the output pipe.

[0006] The valve body is equipped with a drainage component.

[0007] Furthermore, the elastic flow guiding component includes a flow guiding plate, which is disposed inside the valve cavity of the valve body and pressed against the outer wall of the valve plate. A metal elastic sheet is fixedly installed at the bottom end of the flow guiding plate, and the bottom end of the metal elastic sheet is fixedly connected to the inner wall of the valve cavity of the valve body. The diameter of the flow guiding plate is consistent with the inner diameter of the output pipe, and a crescent-shaped notch is provided at the end of the flow guiding plate away from the metal elastic sheet.

[0008] Furthermore, the outer wall of the insertion rod is provided with an exhaust channel, and an elastic corrugated sleeve is fixedly installed at the bottom of the connecting plate. The bottom end of the elastic corrugated sleeve is fixedly connected to the top of the valve plate, and the elastic corrugated sleeve covers the spring.

[0009] Furthermore, a second guide plate is fixedly installed on the inner wall of the output pipe. The second guide plate is inclined and its bottom end faces the first guide plate. A support body is filled between the upper surface of the second guide plate and the inner wall of the output pipe.

[0010] Furthermore, a sealing ring three is fixedly installed on the outer wall of the guide plate facing the output pipe, and a sealing ring two is fixedly installed at the connection between the output pipe and the valve cavity. The outer diameter of the sealing ring three is the same as the inner diameter of the sealing ring two.

[0011] Furthermore, the sealing valve seat includes a mounting base, which is fixedly installed inside the input pipe, and the top end of the mounting base extends into the valve cavity inside the valve body. A sealing seat is installed inside the mounting base. When the valve is closed, the valve plate presses on the sealing seat. An integrally formed support ring is provided at the bottom of the mounting base, and the upper surface of the support ring is bonded to the lower surface of the sealing seat.

[0012] Furthermore, the outer wall of the valve stem is provided with an integrally formed rectangular body, and a ferrule is slidably fitted on the outer wall of the rectangular body. A straight handle and an L-shaped handle are fixedly installed on the outer wall of the ferrule, and a clamping nut is threaded on the top of the valve stem, which presses against the ferrule.

[0013] Furthermore, the vertical section of the L-shaped handle is rotatably fitted with a grip, and the outer wall of the grip is provided with anti-slip texture.

[0014] Furthermore, the drainage component includes a connecting seat, a connecting plate, and a drainage channel. The drainage channel is opened on the valve body and communicates with the valve cavity inside the valve body. The connecting seat is integrally formed with the valve body. A blocking rod is inserted into the drainage channel. The blocking rod is integrally formed with the connecting plate. The connecting plate is fixedly connected to the connecting seat by bolts.

[0015] Furthermore, a sealing ring is fixedly installed inside the drainage channel, and the end of the plugging rod facing the valve body abuts against the sealing ring.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] 1. When the valve needs to be opened, rotating the valve stem will cause the connecting plate to rise, which will cause the spring to pull the valve plate up, separating the valve plate from the sealing valve seat. The insert rod is set to guide the valve plate on one hand, and on the other hand, when the valve needs to be closed, the valve stem can drive the insert rod to move down, thereby pressing the valve plate tightly onto the sealing valve seat. When the valve is open, if the water pressure in the input pipe is lower than the water pressure in the valve body cavity, the pressure acting on the upper surface of the valve plate will press the valve plate down, thereby pressing the valve plate onto the sealing valve seat, thus closing the valve and preventing backflow problems.

[0018] 2. An elastic flow guiding component is set up to guide the water flow from the output pipe into the valve cavity when the water pressure in the output pipe is higher than the water pressure in the valve cavity. This allows the water flow to first press against the valve plate, which then presses the valve plate against the sealing valve seat, thereby closing the valve and achieving the purpose of preventing backflow. A ceramic ring is set up to guide and protect the insert rod, reducing the friction force on the ceramic ring.

[0019] 3. When the valve plate rises and contacts the first guide plate, the first guide plate is tilted. At this time, the first guide plate only serves to guide the flow. The crescent-shaped notch on the first guide plate also ensures that water enters the output pipe from the valve cavity. When the water pressure in the output pipe is greater than the water pressure in the valve cavity, the force on the first guide plate is transmitted to the metal elastic sheet, causing the metal elastic sheet to deform. This causes the tilt angle of the first guide plate to increase, which in turn squeezes the valve plate, causing the valve plate to be pressed onto the sealing valve seat.

[0020] 4. When closing the valve, if it is necessary to drain the water flowing back into the output pipe, the connecting plate and the connecting seat can be separated, and then the connecting plate can be pulled to move the blocking rod. The blocking rod can be removed from the drain channel, and the water in the valve cavity will be discharged from the drain channel. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the present invention;

[0022] Figure 2 For the present invention Figure 1 A structural diagram of the right side view;

[0023] Figure 3 For the present invention Figure 1 A structural schematic diagram of the front sectional view;

[0024] Figure 4 For the present invention Figure 3 A schematic diagram of the structure of the enlarged view at point A;

[0025] Figure 5 For the present invention Figure 3 A structural schematic diagram of the enlarged view at point B;

[0026] Figure 6 This is a schematic diagram of the structure of the valve plate, valve stem, and guide plate of the present invention;

[0027] Figure 7 This is a schematic diagram of the sealing valve seat of the present invention;

[0028] Figure 8 This is a schematic diagram of the structure of the first and second guide plates of the present invention;

[0029] Figure 9 This is a schematic diagram of the structure of the valve stem, sleeve, L-shaped handle, and straight handle of the present invention;

[0030] Figure 10 For the present invention Figure 9 A schematic diagram of the structure in an exploded view.

[0031] In the diagram: 1. Valve body; 2. Inlet pipe; 3. Outlet pipe; 4. Valve stem; 5. Sealing seat; 501. Mounting seat; 502. Sealing seat; 503. Support ring; 6. Valve plate; 7. Anti-backflow mechanism; 701. Connecting plate; 702. Spring; 703. Insert rod; 704. Elastic guide component; 705. Ceramic ring; 7041. Guide plate one; 7042. Crescent notch; 7043. Metal elastic sheet; 8. Exhaust channel; 9. Drainage component; 901. Connecting seat; 902. Connecting plate; 903. Drainage channel; 904. Blocking rod; 10. Elastic corrugated sleeve; 11. Sealing ring one; 12. Sealing ring two; 13. Guide plate two; 14. Support body; 15. Sealing ring three; 16. Compression sleeve; 17. L-shaped handle; 18. Straight handle; 19. Grip; 20. Compression nut; 21. Rectangular body. Detailed Implementation

[0032] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0033] Example 1

[0034] Please see Figures 1-10 The present invention provides a technical solution: an anti-backflow valve, comprising a valve body 1, a valve stem 4, a sealing valve seat 5, and a valve plate 6. An output pipe 3 is provided on the outer right side of the valve body 1, and an input pipe 2 is provided at the bottom of the valve body 1. The sealing valve seat 5 is fixedly installed in the input pipe 2, and the valve plate 6 is pressed on the sealing valve seat 5. An anti-backflow mechanism 7 is provided between the valve plate 6 and the valve cavity inside the valve body 1.

[0035] The anti-backflow mechanism 7 includes a connecting plate 701, a insert rod 703, and an elastic guide component 704. The connecting plate 701 is fixedly sleeved on the valve stem 4. The insert rod 703 is fixedly installed at the bottom end of the valve stem 4 and slides into the groove at the top of the valve plate 6. A ceramic ring 705 is fixedly installed in the groove and slides on the insert rod 703. A spring 702 is fixedly installed at the bottom of the connecting plate 701, and the bottom end of the spring 702 is fixedly connected to the top of the valve plate 6. The elastic guide component 704 is located in the valve cavity inside the valve body 1 and is close to the output pipe 3. When the valve needs to be opened, rotating the valve stem 4 causes the connecting plate 701 to rise, which causes the spring 702 to pull the valve plate 6 up, separating the valve plate 6 from the sealing valve seat 5. The insert rod 703 is positioned to support the valve plate. 6. The valve stem 4 guides the valve plate 703 downward when the valve needs to be closed, thereby pressing the valve plate 6 tightly onto the sealing valve seat 5. When the valve is open, if the water pressure in the input pipe 2 is lower than the water pressure in the valve cavity of the valve body 1, the pressure acting on the upper surface of the valve plate 6 will press the valve plate 6 downward, thereby pressing the valve plate 6 onto the sealing valve seat 5, thus closing the valve and avoiding backflow. The elastic flow guiding component 704 is set to guide the water flow from the output pipe 3 into the valve cavity when the water pressure in the output pipe 3 is higher than the water pressure in the valve cavity, so that the water flow first presses on the valve plate 6 and presses the valve plate 6 onto the sealing valve seat 5, thereby closing the valve and achieving the purpose of preventing backflow. The ceramic ring 705 is set to guide and protect the insert rod 703 and reduce the friction force on the ceramic ring 705.

[0036] The valve body 1 is equipped with a drain component 9, which can discharge excess water in the output pipe 3 when it is necessary to discharge it in time.

[0037] The elastic flow guiding component 704 includes a flow guiding plate 7041, which is disposed inside the valve cavity of the valve body 1. The flow guiding plate 7041 presses against the outer wall of the valve plate 6. A metal elastic sheet 7043 is fixedly installed at the bottom end of the flow guiding plate 7041, and the bottom end of the metal elastic sheet 7043 is fixedly connected to the inner wall of the valve cavity of the valve body 1. The diameter of the flow guiding plate 7041 is the same as the inner diameter of the output pipe 3. A crescent-shaped notch 7042 is provided at the end of the flow guiding plate 7041 away from the metal elastic sheet 7043. When the valve plate 6 is raised, the flow guiding plate... When 7041 contacts, the guide plate 7041 is tilted. At this time, the guide plate 7041 only serves to guide the flow. The crescent notch 7042 on the guide plate 7041 can also ensure that water enters the output pipe 3 from the valve cavity. When the water pressure in the output pipe 3 is greater than the water pressure in the valve cavity, the force on the guide plate 7041 is transmitted to the metal elastic sheet 7043, causing the metal elastic sheet 7043 to deform. This causes the tilt angle of the guide plate 7041 to increase, which in turn squeezes the valve plate 6, causing the valve plate 6 to be pressed onto the sealing valve seat 5.

[0038] The outer wall of the insertion rod 703 is provided with an exhaust channel 8. An elastic corrugated sleeve 10 is fixedly installed at the bottom of the connecting plate 701. The bottom end of the elastic corrugated sleeve 10 is fixedly connected to the top of the valve plate 6, and the elastic corrugated sleeve 10 covers the spring 702. The elastic corrugated sleeve 10 is provided to protect the spring 702. The exhaust channel 8 is provided so that the insertion rod 703 will not be unable to move due to the air pressure difference when sliding in the groove.

[0039] A second guide plate 13 is fixedly installed on the inner wall of the output pipe 3. The second guide plate 13 is inclined and its bottom end faces the first guide plate 7041. The upper surface of the second guide plate 13 and the inner wall of the output pipe 3 are filled with a support body 14. The second guide plate 13 is set to guide the water flowing back in the output pipe 3, so that more water is directed to the first guide plate 7041, so that there is enough water flow to push the first guide plate 7041 to tilt, thereby ensuring that the first guide plate 7041 can press against the valve plate 6.

[0040] A sealing ring 3 15 is fixedly installed on the outer wall of the guide plate 7041 facing the output pipe 3, and a sealing ring 2 12 is fixedly installed at the connection between the output pipe 3 and the valve cavity. The outer diameter of the sealing ring 3 15 is the same as the inner diameter of the sealing ring 2 12. The sealing ring 3 15 and the sealing ring 2 12 are used to set the second valve closing structure. When the valve stem 4 drives the valve plate 6 to rise, the valve plate 6 will push the guide plate 7041 to gradually become vertical. Then the sealing ring 3 15 on the guide plate 7041 will be inserted into the sealing ring 2 12 until the edge of the valve plate 6 is inserted into the crescent notch 7042. At this time, the water in the output pipe 3 cannot enter the valve cavity.

[0041] The sealing valve seat 5 includes a mounting seat 501, which is fixedly installed inside the input pipe 2, and the top end of the mounting seat 501 extends into the valve cavity inside the valve body 1. A sealing seat 502 is installed inside the mounting seat 501. When the valve is closed, the valve plate 6 presses on the sealing seat 502. An integrally formed support ring 503 is provided at the bottom of the mounting seat 501. The upper surface of the support ring 503 is bonded to the lower surface of the sealing seat 502. The mounting seat 501 is provided for installing and limiting the sealing seat 502 to avoid excessive deformation of the sealing seat 502. The support ring 503 is provided for supporting the sealing seat 502 to prevent the sealing seat 502 from falling out of the mounting seat 501.

[0042] The outer wall of the valve stem 4 is provided with an integrally formed rectangular body 21. A retainer 16 is slidably sleeved on the outer wall of the rectangular body 21. A straight handle 18 and an L-shaped handle 17 are fixedly installed on the outer wall of the retainer 16. A clamping nut 20 is threaded on the top of the valve stem 4. The clamping nut 20 presses on the retainer 16. The retainer 16 is installed on the valve stem 4 by the clamping nut 20 and the rectangular body 21, so that the retainer 16 is detachable. The straight handle 18 and the L-shaped handle 17 are provided for rotating the retainer 16, thereby rotating the valve stem 4.

[0043] The vertical section of the L-shaped handle 17 is fitted with a grip 19. The outer wall of the grip 19 is provided with anti-slip texture. The grip 19 allows for better force application when rotating the vertical end of the L-shaped handle 17.

[0044] Working principle: When the valve needs to be opened, rotating the valve stem 4 causes the connecting plate 701 to rise, which in turn causes the spring 702 to pull the valve plate 6 up, separating the valve plate 6 from the sealing valve seat 5. The insert rod 703 is set to guide the valve plate 6 on one hand, and on the other hand, when the valve needs to be closed, the valve stem 4 can drive the insert rod 703 to move down, thereby pressing the valve plate 6 tightly onto the sealing valve seat 5. When the valve is open, if the water pressure in the input pipe 2 is lower than the water pressure in the valve cavity of the valve body 1, the pressure acting on the upper surface of the valve plate 6 will press the valve plate 6 downward, thereby pressing the valve plate 6 onto the sealing valve seat 5, thus closing the valve and preventing backflow. When the water pressure in the output pipe 3 is greater than the water pressure in the valve cavity, the force of the guide plate 7041 is transmitted to the metal elastic sheet 7043, causing the metal elastic sheet 7043 to deform, thereby increasing the tilt angle of the guide plate 7041, which in turn squeezes the valve plate 6, causing the valve plate 6 to be pressed onto the sealing valve seat 5, further playing the role of preventing backflow.

[0045] Example 2

[0046] Please see Figures 1-10 The present invention provides a technical solution: an anti-backflow valve, comprising a valve body 1, a valve stem 4, a sealing valve seat 5, and a valve plate 6. An output pipe 3 is provided on the outer right side of the valve body 1, and an input pipe 2 is provided at the bottom of the valve body 1. The sealing valve seat 5 is fixedly installed in the input pipe 2, and the valve plate 6 is pressed on the sealing valve seat 5. An anti-backflow mechanism 7 is provided between the valve plate 6 and the valve cavity inside the valve body 1.

[0047] The anti-backflow mechanism 7 includes a connecting plate 701, a insert rod 703, and an elastic guide component 704. The connecting plate 701 is fixedly sleeved on the valve stem 4. The insert rod 703 is fixedly installed at the bottom end of the valve stem 4 and slides into the groove at the top of the valve plate 6. A ceramic ring 705 is fixedly installed in the groove and slides on the insert rod 703. A spring 702 is fixedly installed at the bottom of the connecting plate 701, and the bottom end of the spring 702 is fixedly connected to the top of the valve plate 6. The elastic guide component 704 is located in the valve cavity inside the valve body 1 and is close to the output pipe 3. When the valve needs to be opened, rotating the valve stem 4 causes the connecting plate 701 to rise, which causes the spring 702 to pull the valve plate 6 up, separating the valve plate 6 from the sealing valve seat 5. The insert rod 703 is positioned to support the valve plate. 6. The valve stem 4 guides the valve plate 703 downward when the valve needs to be closed, thereby pressing the valve plate 6 tightly onto the sealing valve seat 5. When the valve is open, if the water pressure in the input pipe 2 is lower than the water pressure in the valve cavity of the valve body 1, the pressure acting on the upper surface of the valve plate 6 will press the valve plate 6 downward, thereby pressing the valve plate 6 onto the sealing valve seat 5, thus closing the valve and avoiding backflow. The elastic flow guiding component 704 is set to guide the water flow from the output pipe 3 into the valve cavity when the water pressure in the output pipe 3 is higher than the water pressure in the valve cavity, so that the water flow first presses on the valve plate 6 and presses the valve plate 6 onto the sealing valve seat 5, thereby closing the valve and achieving the purpose of preventing backflow. The ceramic ring 705 is set to guide and protect the insert rod 703 and reduce the friction force on the ceramic ring 705.

[0048] The valve body 1 is equipped with a drain component 9, which can discharge excess water in the output pipe 3 when it is necessary to discharge it in time.

[0049] The elastic flow guiding component 704 includes a flow guiding plate 7041, which is disposed inside the valve cavity of the valve body 1. The flow guiding plate 7041 presses against the outer wall of the valve plate 6. A metal elastic sheet 7043 is fixedly installed at the bottom end of the flow guiding plate 7041, and the bottom end of the metal elastic sheet 7043 is fixedly connected to the inner wall of the valve cavity of the valve body 1. The diameter of the flow guiding plate 7041 is the same as the inner diameter of the output pipe 3. A crescent-shaped notch 7042 is provided at the end of the flow guiding plate 7041 away from the metal elastic sheet 7043. When the valve plate 6 is raised, the flow guiding plate... When 7041 contacts, the guide plate 7041 is tilted. At this time, the guide plate 7041 only serves to guide the flow. The crescent notch 7042 on the guide plate 7041 can also ensure that water enters the output pipe 3 from the valve cavity. When the water pressure in the output pipe 3 is greater than the water pressure in the valve cavity, the force on the guide plate 7041 is transmitted to the metal elastic sheet 7043, causing the metal elastic sheet 7043 to deform. This causes the tilt angle of the guide plate 7041 to increase, which in turn squeezes the valve plate 6, causing the valve plate 6 to be pressed onto the sealing valve seat 5.

[0050] The outer wall of the insert rod 703 is provided with an exhaust channel 8, and the bottom of the connecting plate 701 is fixedly installed with an elastic corrugated sleeve 10. The bottom end of the elastic corrugated sleeve 10 is fixedly connected to the top of the valve plate 6, and the elastic corrugated sleeve 10 covers the spring 702.

[0051] A guide plate 2 13 is fixedly installed on the inner wall of the output pipe 3. The guide plate 2 13 is inclined and the bottom end of the guide plate 2 13 faces the guide plate 1 7041. The upper surface of the guide plate 2 13 and the inner wall of the output pipe 3 are filled with a support body 14.

[0052] A sealing ring 3 15 is fixedly installed on the outer wall of the guide plate 1 7041 facing the output pipe 3, and a sealing ring 2 12 is fixedly installed at the connection between the output pipe 3 and the valve cavity. The outer diameter of the sealing ring 3 15 is the same as the inner diameter of the sealing ring 2 12.

[0053] The sealing valve seat 5 includes a mounting seat 501, which is fixedly installed inside the input pipe 2, and the top end of the mounting seat 501 extends into the valve cavity inside the valve body 1. A sealing seat 502 is installed inside the mounting seat 501. When the valve is closed, the valve plate 6 presses on the sealing seat 502. An integrally formed support ring 503 is provided at the bottom of the mounting seat 501, and the upper surface of the support ring 503 is bonded to the lower surface of the sealing seat 502.

[0054] The outer wall of the valve stem 4 is provided with an integrally formed rectangular body 21. The outer wall of the rectangular body 21 is slidably fitted with a sleeve 16. The outer wall of the sleeve 16 is fixedly installed with a straight handle 18 and an L-shaped handle 17. The top of the valve stem 4 is threaded with a clamping nut 20, which presses against the sleeve 16.

[0055] The vertical section of the L-shaped handle 17 is rotatably fitted with a grip 19, and the outer wall of the grip 19 is provided with anti-slip texture.

[0056] The drainage component 9 includes a connecting seat 901, a connecting plate 902, and a drainage channel 903. The drainage channel 903 is opened on the valve body 1 and communicates with the valve cavity inside the valve body 1. The connecting seat 901 is integrally formed with the valve body 1. A blocking rod 904 is inserted into the drainage channel 903. The blocking rod 904 is integrally formed with the connecting plate 902. The connecting plate 902 is fixedly connected to the connecting seat 901 by bolts. When the valve is closed, if it is necessary to drain the water flowing back into the output pipe 3, the connecting plate 902 and the connecting seat 901 can be separated. Then, the connecting plate 902 can be pulled to move the blocking rod 904 and remove the blocking rod 904 from the drainage channel 903. At this time, the water in the valve cavity will be discharged from the drainage channel 903.

[0057] A sealing ring 11 is fixedly installed inside the drainage channel 903. The end of the plugging rod 904 facing the valve body 1 abuts against the sealing ring 11. After the plugging rod 904 is inserted into the drainage channel 903, the sealing ring 11 plays a certain role in preventing water leakage and avoiding water leakage in the drainage channel 903.

[0058] Working principle: In use, when the valve needs to be opened, rotating the valve stem 4 causes the connecting plate 701 to rise, which in turn causes the spring 702 to pull the valve plate 6 up, separating the valve plate 6 from the sealing valve seat 5. The insert rod 703 guides the valve plate 6 on one hand, and on the other hand, when the valve needs to be closed, the valve stem 4 can drive the insert rod 703 to move downwards, thus pressing the valve plate 6 tightly onto the sealing valve seat 5. When the valve is open, if the water pressure in the input pipe 2 is lower than the water pressure in the valve cavity of the valve body 1, the pressure acting on the upper surface of the valve plate 6 will press the valve plate 6 downwards, thus pressing the valve plate 6 onto the sealing valve seat 5, achieving valve closure and preventing backflow. When the water pressure in the output pipe 3 is greater than the water pressure in the valve cavity, the force on the guide plate 7041 is transmitted to the metal elastic sheet 7043, causing the metal elastic sheet 7043 to deform. This causes the tilt angle of the guide plate 7041 to increase, which in turn squeezes the valve plate 6, causing the valve plate 6 to be pressed onto the sealing valve seat 5, further preventing backflow. After the valve is closed, if the backflowing water in the output pipe 3 needs to be discharged, the connecting plate 902 and the connecting seat 901 can be separated. Then, the connecting plate 902 can be pulled to move the blocking rod 904, removing the blocking rod 904 from the drainage channel 903. At this time, the water in the valve cavity will be discharged from the drainage channel 903.

[0059] Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

Claims

1. A backflow prevention valve, comprising a valve body (1), a valve stem (4), a sealing valve seat (5), and a valve plate (6), wherein an output pipe (3) is provided on the right outer wall of the valve body (1), and an input pipe (2) is provided at the bottom of the valve body (1), characterized in that: The sealing valve seat (5) is fixedly installed inside the input pipe (2), and the valve plate (6) is pressed on the sealing valve seat (5). An anti-backflow mechanism (7) is provided between the valve plate (6) and the valve cavity inside the valve body (1). The anti-backflow mechanism (7) includes a connecting plate (701), a plug rod (703), and an elastic guide component (704). The connecting plate (701) is fixedly sleeved on the valve stem (4). The plug rod (703) is fixedly installed at the bottom end of the valve stem (4). The plug rod (703) is slidably inserted into the groove at the top of the valve plate (6), and a ceramic ring (705) is fixedly installed in the groove. The ceramic ring (705) is slidably sleeved on the plug rod (703). A spring (702) is fixedly installed at the bottom of the connecting plate (701). The bottom end of the spring (702) is fixedly connected to the top of the valve plate (6). The elastic guide component (704) is set in the valve cavity inside the valve body (1) and is close to the output pipe (3). The valve body (1) is provided with a drainage component (9).

2. The anti-backflow valve according to claim 1, characterized in that: The elastic flow guiding component (704) includes a flow guiding plate (7041), which is disposed in the valve cavity of the valve body (1). The flow guiding plate (7041) is pressed against the outer wall of the valve plate (6). A metal elastic sheet (7043) is fixedly installed at the bottom end of the flow guiding plate (7041). The bottom end of the metal elastic sheet (7043) is fixedly connected to the inner wall of the valve cavity of the valve body (1). The diameter of the flow guiding plate (7041) is consistent with the inner diameter of the output pipe (3). A crescent notch (7042) is opened at the end of the flow guiding plate (7041) away from the metal elastic sheet (7043).

3. The anti-backflow valve according to claim 1, characterized in that: The outer wall of the insert (703) is provided with an exhaust channel (8), and an elastic corrugated sleeve (10) is fixedly installed at the bottom of the connecting plate (701). The bottom end of the elastic corrugated sleeve (10) is fixedly connected to the top of the valve plate (6), and the elastic corrugated sleeve (10) covers the spring (702).

4. The anti-backflow valve according to claim 1, characterized in that: The inner wall of the output pipe (3) is fixedly installed with a second guide plate (13). The second guide plate (13) is inclined and the bottom end of the second guide plate (13) faces the first guide plate (7041). The upper surface of the second guide plate (13) and the inner wall of the output pipe (3) are filled with a support (14).

5. A backflow prevention valve according to claim 2, characterized in that: A sealing ring three (15) is fixedly installed on the outer wall of the guide plate one (7041) facing the output pipe (3), and a sealing ring two (12) is fixedly installed at the connection between the output pipe (3) and the valve cavity. The outer diameter of the sealing ring three (15) is the same as the inner diameter of the sealing ring two (12).

6. The anti-backflow valve according to claim 1, characterized in that: The sealing valve seat (5) includes a mounting seat (501), which is fixedly installed in the input pipe (2), and the top end of the mounting seat (501) extends into the valve cavity inside the valve body (1). A sealing seat (502) is installed inside the mounting seat (501). When the valve is closed, the valve plate (6) presses on the sealing seat (502). An integrally formed support ring (503) is provided at the bottom of the mounting seat (501), and the upper surface of the support ring (503) is bonded to the lower surface of the sealing seat (502).

7. The anti-backflow valve according to claim 1, characterized in that: The outer wall of the valve stem (4) is provided with an integrally formed rectangular body (21). The outer wall of the rectangular body (21) is slidably fitted with a sleeve (16). The outer wall of the sleeve (16) is fixedly installed with a straight handle (18) and an L-shaped handle (17). The top end of the valve stem (4) is threaded with a clamping nut (20), which presses against the sleeve (16).

8. A backflow prevention valve according to claim 7, characterized in that: The vertical section of the L-shaped handle (17) is fitted with a grip (19), and the outer wall of the grip (19) is provided with anti-slip texture.

9. The anti-backflow valve according to claim 1, characterized in that: The drainage component (9) includes a connecting seat (901), a connecting plate (902), and a drainage channel (903). The drainage channel (903) is opened on the valve body (1) and communicates with the valve cavity inside the valve body (1). The connecting seat (901) is integrally formed with the valve body (1). A blocking rod (904) is inserted into the drainage channel (903). The blocking rod (904) is integrally formed with the connecting plate (902). The connecting plate (902) is fixedly connected to the connecting seat (901) by bolts.

10. A backflow prevention valve according to claim 9, characterized in that: A sealing ring (11) is fixedly installed inside the drainage channel (903), and the end of the plugging rod (904) facing the valve body (1) abuts against the sealing ring (11).

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