Anti-reflux valve
By combining the thrust of the backflowing water and the elasticity of the spring, the piston quickly resets and blocks the inlet. Combined with the anti-backflow component design, it ensures that the water flow direction is consistent, solves the problem of spring failure in existing anti-backflow valves, and achieves rapid anti-backflow and extended service life.
Patent Information
- Application Number
- CN202422847599.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-21
- Publication Date
- 2025-11-11
- Estimated Expiration
- 2034-11-21
AI Technical Summary
After prolonged use, the springs in existing anti-backflow valves gradually lose their elasticity, resulting in a slow response speed, poor anti-backflow effect, and limited service life.
The piston quickly resets and blocks the inlet by the combined action of the thrust of the backflowing water and the elasticity of the spring. Combined with the anti-backflow component design, it ensures that the water flow direction is consistent and prevents backflow.
It achieves rapid backflow prevention, improves the service life of the valve and the backflow prevention effect, and also extends the service life of the spring.
Smart Images
Figure CN223537017U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of valve technology, specifically to an anti-backflow valve. Background Technology
[0002] Valves are pipeline accessories used to open and close pipelines, control flow direction, and regulate and control the parameters (temperature, pressure, and flow rate) of the transported medium. Valves are ubiquitous in daily life and play a significant role in social development. However, some valves on the market have specific functions, such as backflow prevention. If the pipeline is under negative pressure when the valve is not closed, it can cause liquid backflow, which may lead to contamination of the original liquid and damage to the machine. Valves are also components that are easily damaged.
[0003] Existing valve structures with backflow prevention functions generally utilize the rebound of a return spring when there is no pressure or negative pressure to block the piston at the water inlet, thus preventing backflow. This method is simple and widely used, but it also has some drawbacks. After prolonged use, the elasticity of the spring gradually weakens, the response speed becomes relatively slow, and it may even fail to move the piston, thereby gradually reducing the effectiveness of backflow prevention or even causing it to fail, resulting in a limited service life. Utility Model Content
[0004] To address the aforementioned shortcomings of existing technologies, this utility model provides an anti-backflow valve. By combining the thrust of the backflowing water with the elastic force of the spring, the piston is simultaneously reset to block the inlet, quickly achieving the purpose of preventing backflow. The effect is significant and also helps the spring, extending its service life.
[0005] To achieve the above objectives, this utility model provides the following technical solution: an anti-backflow valve, comprising a valve body and a Y-connector. A water inlet is located on one side of the upper part of the valve body, and a water inlet is located near the center inside the valve body. The inner diameter of the water inlet is smaller than the inner diameter of the valve body. A manual control switch is located at the top of the valve body. A fixing plate is located at the center of the lower part of the valve body, and a return water inlet is located at the center of the fixing plate. Multiple first springs are evenly arranged around the fixing plate. A piston is located at the upper end of each first spring, and the diameter of the piston is larger than the inner diameter of the water inlet. The elastic force of the first springs can cause the piston to block the water inlet. At the bottom of the inlet, the Y-connector is connected to the lower part of the cylinder body. The Y-connector includes a first interface, a second interface, a water outlet interface, and two anti-reverse components. One end of the first interface and the second interface are respectively connected to the cylinder body, and the other end is connected to the water outlet interface. The first interface is located on the side near the water inlet of the cylinder body, and the second interface is located near the bottom of the cylinder body. The anti-reverse components are respectively disposed inside the first interface and the second interface. The anti-reverse component of the first interface enables water to flow from the cylinder body to the water outlet interface and prevents backflow. The anti-reverse component in the second interface enables water to flow from the water outlet interface to the cylinder body and prevents backflow.
[0006] Preferably, the anti-reverse component includes a backflow seat, a backflow plug, a second spring, and a fixing rod. The fixing rod is vertically disposed inside the first interface. One end of the second spring is fixedly connected to the side wall of the fixing rod, and the other end is fixedly connected to the backflow plug. The second spring and the backflow plug are designed to face the side of the cylinder body. The backflow seat is disposed inside the first interface, and the reset of the second spring can cause the backflow plug to block the backflow seat. The anti-reverse component in the second interface has the same structure as the anti-reverse component in the first interface. The second spring and the backflow plug in the second interface are designed to face the side of the water outlet.
[0007] Preferably, the hand-operated switch includes a handle, a threaded rod, and a blocking plate. A threaded hole is provided at the center of the top of the cylinder. The threaded rod is screwed into the threaded hole. The upper end of the threaded rod is connected to the handle, and the lower end is connected to the center of the blocking plate. The diameter of the blocking plate is larger than the inner diameter of the inlet.
[0008] Preferably, a hidden groove is provided at the top of the cylinder corresponding to the position of the blocking plate.
[0009] Preferably, a guide plate is provided at the bottom of the cylinder corresponding to the position of the fixed plate.
[0010] This utility model provides an anti-backflow valve, which has the following beneficial effects:
[0011] 1. This utility model uses the thrust of the backflowing water and the elastic force of the spring to simultaneously reset the piston and block the water outlet, thus quickly achieving the purpose of preventing backflow. The effect is obvious and it can also help the spring and extend its service life.
[0012] 2. The top of the cylinder body of this utility model is provided with a hidden groove, and the blocking plate can be retracted into the hidden groove without affecting the normal water flow effect; a guide plate is provided at the bottom of the cylinder body corresponding to the return water port of the fixed plate, so that the return water can quickly pass through the return water port and push the piston to quickly block the inlet. Attached Figure Description
[0013] Figure 1 This is a front sectional view of the present invention during normal operation.
[0014] Figure 2 This is a front cross-sectional view of the present invention during reflow.
[0015] Figure 3 This is a front sectional view of the blocking plate of this utility model when the water inlet is closed.
[0016] In the diagram: 1. Cylinder body; 2. Y-connector; 3. Anti-reverse component; 4. Manual switch; 5. Water inlet interface; 6. Water inlet; 7. Piston; 8. First spring; 9. Fixing plate; 10. Guide plate; 21. First interface; 22. Second interface; 23. Water outlet interface; 31. Reverse flow seat; 32. Reverse flow plug; 33. Second spring; 34. Fixing rod; 41. Blocking plate; 42. Threaded rod; 43. Handle; 44. Threaded hole; 45. Hidden groove; 91. Return water inlet. Detailed Implementation
[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0018] like Figure 1-3As shown, an anti-backflow valve includes a valve body 1 and a Y-connector 2. A water inlet 5 is located on one side of the upper part of the valve body 1. An inlet 6 is located near the center inside the valve body 1, with an inner diameter smaller than the inner diameter of the valve body 1. A manual control switch 4 is located at the top of the valve body 1. A fixing plate 9 is located at the center of the lower part of the valve body 1. A return water inlet 91 is located at the center of the fixing plate 9. Multiple first springs 8 are evenly arranged around the fixing plate 9. A piston 7 is located at the upper end of each first spring 8, and the diameter of the piston 7 is larger than the inner diameter of the inlet 6. The elastic force of the first springs 8 allows the piston 7 to block the bottom of the inlet 6. Y-connector 2 is connected to the lower part of cylinder body 1. Y-connector 2 includes a first interface 21, a second interface 22, a water outlet interface 23, and two anti-reverse components 3. One end of the first interface 21 and the second interface 22 are connected to the cylinder body 1, and the other end is connected to the water outlet interface 23. The first interface 21 is located near the water inlet 6 of the cylinder body 1, and the second interface 22 is located near the bottom of the cylinder body 1. The anti-reverse components 3 are respectively disposed inside the first interface 21 and the second interface 22. The anti-reverse component 3 of the first interface 21 enables water to flow from the cylinder body 1 to the water outlet interface 23 and prevents backflow. The anti-reverse component 3 in the second interface 22... Component 3 allows water to flow from the outlet 23 to the cylinder body 1 without backflow; the anti-backflow component 3 includes a backflow seat 31, a backflow plug 32, a second spring 33, and a fixing rod 34. The fixing rod 34 is vertically arranged inside the first interface 21. One end of the second spring 33 is fixedly connected to the side wall of the fixing rod 34, and the other end is fixedly connected to the backflow plug 32. The second spring 33 and the backflow plug 32 are designed to face the cylinder body 1. The backflow seat 31 is arranged inside the first interface 21, and the reset of the second spring 33 can cause the backflow plug 32 to block the backflow seat 31. The anti-backflow component 3 in the second interface 22 is connected to the component in the first interface 21. The anti-reverse component 3 has the same structure. The second spring 33 and the backflow plug 32 in the second interface 22 are designed to face the water outlet interface 23. The hand control switch 4 includes a handle 43, a threaded rod 42 and a blocking plate 41. A threaded hole 44 is opened at the center of the top of the cylinder 1. The threaded rod 42 is screwed into the threaded hole 44. The upper end of the threaded rod 42 is connected to the handle 43 and the lower end is connected to the center of the blocking plate 41. The diameter of the blocking plate 41 is larger than the inner diameter of the water inlet 6. A hidden groove 45 is opened at the top of the cylinder 1 corresponding to the position of the blocking plate 41. A guide plate 10 is provided at the bottom of the cylinder 1 corresponding to the position of the fixing plate 9.
[0019] Its detailed connection methods are well-known technologies in this field. The following mainly introduces the working principle and process, as follows:
[0020] According to the instruction manual Figure 1-3 As can be seen, the water inlet 5 and water outlet 23 of this utility model are respectively connected to an external water pipe. When not in operation, such as... Figure 3As shown, with manual switch 4 closed, inlet 6 is blocked, resulting in no water flow. During operation, as... Figure 1 As shown, when the manual switch 4 is turned on, water flows in from the inlet 5 into the cylinder 1. Passing through the water outlet, due to water pressure, the piston 7 is pushed, and the first spring 8 is compressed. Because the anti-reverse component 3 of the first interface 21 allows water to flow from the cylinder 1 to the outlet 23 without reverse flow, and the anti-reverse component 3 in the second interface 22 allows water to flow from the outlet 23 to the cylinder 1 without reverse flow, water flows from the cylinder 1 along the first interface 21 to the outlet 23 and out. When the water pressure is stable, the piston 7 and the anti-reverse component 3 are in a stable state, and water flows normally. When the external water supply malfunctions or suddenly stops, a negative pressure occurs on the inlet 5 side relative to the outlet 23 side, causing water on the outlet 23 side to flow back towards the inlet 5 side. At this time, if... Figure 2 As shown, the anti-reverse component 3 of the first interface 21 enables water to flow from the cylinder 1 to the outlet interface 23 and prevents backflow. The anti-reverse component 3 in the second interface 22 enables water to flow from the outlet interface 23 to the cylinder 1 and prevents backflow. The backflowing water flows from the second interface 22 to the bottom of the cylinder and impacts the piston 7 upward from the return port 91 of the fixed plate 9. At the same time, with the spring force of the first spring 8 on the piston 7, the piston 7 can be moved upward quickly and block the inlet 6 to prevent backflow. The reaction is rapid and the effect is obvious. It can also help the spring and improve its service life.
[0021] The anti-backflow component 3 includes a backflow seat 31, a backflow plug 32, a second spring 33, and a fixing rod 34. The fixing rod 34 is vertically installed inside the first interface 21. The second spring 33 and the backflow plug 32 are designed to face the side of the cylinder body 1. The reset of the second spring 33 can cause the backflow plug 32 to block the backflow seat 31, so that water can flow from the cylinder body 1 to the outlet interface 23 but cannot flow backward. The anti-backflow component 3 in the second interface 22 has the same structure as the anti-backflow component 3 in the first interface 21, but the design direction is similar. The second spring 33 and the backflow plug 32 in the second interface 22 are designed to face the side of the outlet interface 23, so that water can flow from the outlet interface 23 to the cylinder body 1 but cannot flow backward. During operation, when water flows normally, the backflow plug 32 in the first port 21 is pushed open by the water, creating a gap between it and the backflow seat 31. The second spring 33 is compressed, and the backflow plug 32 in the second port 22 is in a state of blocking the backflow seat 31. During anti-backflow operation, the backflow plug 32 in the second port 22 is pushed open by the water, creating a gap between it and the backflow seat 31. The backflowing water flows towards the bottom of the cylinder 1, and the backflow plug 32 in the first port 21 is in a state of blocking the backflow seat 31, allowing more backflowing water to flow through the second port 22, thus improving the anti-backflow response speed. The anti-backflow component 3 can use simple existing technology to achieve the above functions; its design and functional requirements are not high, and it only needs to be easy to manufacture.
[0022] The manual switch 4 includes a handle 43, a threaded rod 42, and a blocking plate 41. During operation, the operator rotates the handle 43, causing the threaded rod 42 to rotate. Since the threaded rod 42 is screwed into the threaded hole 44 at the top of the cylinder 1, the rotation of the threaded rod 42 causes the blocking plate 41 to move up and down. Because the diameter of the blocking plate 41 is larger than the inner diameter of the inlet 6, the blocking plate 41 can block the inlet 6, thus providing a simple and convenient manually controlled switch. Alternatively, a hidden groove 45 can be provided at the top of the cylinder 1 corresponding to the position of the blocking plate 41, allowing the blocking plate 41 to be retracted into the hidden groove 45 without affecting the normal water flow.
[0023] Among them, a guide plate 10 is provided at the bottom of the cylinder 1 corresponding to the fixed plate 9. The guide plate 10 is designed to be inclined around the lower edge of the return water port 91, which allows the return water to pass through the return water port 91 quickly and pushes the piston 7 to quickly block the inlet 6.
[0024] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A backflow prevention valve, characterized in that, The valve includes a cylinder body (1) and a Y-connector (2). The cylinder body (1) has an inlet port (5) on one side of its upper part. An inlet port (6) is located near the center inside the cylinder body (1). The inner diameter of the inlet port (6) is smaller than the inner diameter of the cylinder body (1). A hand-operated switch (4) is located at the top of the cylinder body (1). A fixing plate (9) is located at the center of the lower part of the cylinder body (1). A return port (91) is located at the center of the fixing plate (9). Multiple first springs (8) are evenly arranged around the fixing plate (9). A piston (7) is located at the upper end of each first spring (8), and the diameter of the piston (7) is larger than the inner diameter of the inlet port (6). The elastic force of the first springs (8) allows the piston (7) to block the bottom of the inlet port (6). The Y-connector (2) is connected to the lower part of the cylinder body (1). (2) Includes a first interface (21), a second interface (22), a water outlet (23), and two anti-reverse components (3). One end of the first interface (21) and the second interface (22) are connected to the cylinder body (1), and the other end is connected to the water outlet (23). The first interface (21) is located on the side near the water inlet (6) of the cylinder body (1), and the second interface (22) is located near the bottom of the cylinder body (1). The anti-reverse components (3) are respectively installed inside the first interface (21) and the second interface (22). The anti-reverse component (3) of the first interface (21) enables water to flow from the cylinder body (1) to the water outlet (23) and prevents it from flowing backward. The anti-reverse component (3) in the second interface (22) enables water to flow from the water outlet (23) to the cylinder body (1) and prevents it from flowing backward.
2. The anti-backflow valve according to claim 1, characterized in that, The anti-reverse component (3) includes a reverse flow seat (31), a reverse flow plug (32), a second spring (33), and a fixing rod (34). The fixing rod (34) is vertically arranged inside the first interface (21). One end of the second spring (33) is fixedly connected to the side wall of the fixing rod (34), and the other end is fixedly connected to the reverse flow plug (32). The second spring (33) and the reverse flow plug (32) are designed to face the side of the cylinder body (1). The reverse flow seat (31) is arranged inside the first interface (21), and the reset of the second spring (33) can make the reverse flow plug (32) block the reverse flow seat (31). The anti-reverse component (3) in the second interface (22) has the same structure as the anti-reverse component (3) in the first interface (21). The second spring (33) and the reverse flow plug (32) in the second interface (22) are designed to face the side of the water outlet (23).
3. The anti-backflow valve according to claim 1, characterized in that, The hand switch (4) includes a handle (43), a threaded rod (42) and a blocking plate (41). A threaded hole (44) is provided at the center of the top of the cylinder (1). The threaded rod (42) is screwed into the threaded hole (44). The upper end of the threaded rod (42) is connected to the handle (43), and the lower end is connected to the center of the blocking plate (41). The diameter of the blocking plate (41) is larger than the inner diameter of the inlet (6).
4. The anti-backflow valve according to claim 3, characterized in that, A hidden groove (45) is provided on the top of the cylinder (1) at the position corresponding to the blocking plate (41).
5. The anti-backflow valve according to claim 1, characterized in that, A guide plate (10) is provided at the bottom of the cylinder (1) corresponding to the position of the fixing plate (9).