Bypass valve capable of preventing backflow
By designing a deflector and a back punch hole structure in the anti-counter-current bypass valve, the return water is guided to the bottom of the piston, so that it can quickly reset the spring force to block the water outlet, solving the problem of weakening the elastic effect of the existing anti-counter-current bypass valve, achieving high sensitivity and good anti-counter-current effect.
Patent Information
- Application Number
- CN202420667290.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-02
- Publication Date
- 2025-03-28
- Estimated Expiration
- 2034-04-02
AI Technical Summary
The spring of the existing anti-countercurrent bypass valve has weakened its elasticity after long-term use, slowing down its rebound speed, resulting in a worsening sensitivity of anti-countercurrent and even stuck.
An anti-counter-current bypass valve is designed to guide the return water to the guide hole through the deflector plate, and the water flows to the return punch hole through the connecting pipe, rushing to the bottom of the piston, so that it can quickly reset and block the water outlet with the spring force of the spring.
It realizes effective prevention of water reflow of the branch water pipe, high sensitivity, good anti-reflow effect, and avoids the problem of weakening of the elastic effect after long-term use of the spring.
Smart Images
Figure CN222687393U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of bypass valves, in particular to a bypass valve for preventing backflow. Background Art
[0002] A bypass valve is a valve installed on the bypass pipe of the water inlet valve pipe section to fill water and balance the water pressure before and after the water inlet valve. For example, pressure reducing valves, control valves and steam traps are usually equipped with bypass pipes. The term bypass valve refers to a valve installed on a bypass pipe, but does not specifically refer to the valve type and structure. The bypass valve is also known as a self-operated bypass differential pressure valve or a self-operated differential pressure control valve.
[0003] Some bypass valves have an anti-backflow function. In the existing anti-backflow structure, the elastic force of the spring is used to reset the piston to seal the water outlet. However, in actual use, the elastic effect of the spring will become worse and worse after long-term use, the rebound speed will become slower and slower, the sensitivity of anti-backflow will deteriorate, and sometimes even get stuck. Utility Model Content
[0004] In view of the above-mentioned deficiencies in the prior art, the utility model provides a bypass valve for preventing backflow. When backflow occurs in the branch water pipe, the guide plate will direct the backflow water from the guide hole along the connecting pipe to the backflushing hole, and flush it to the bottom of the piston so that it will quickly reset and block the water outlet with the elastic force of the spring, thereby preventing the water in the branch water pipe from flowing back. The utility model has high sensitivity and good backflow prevention effect.
[0005] To achieve the above purpose, the utility model is implemented through the following technical solutions: a backflow prevention bypass valve, including a main water pipe, a valve body front section, a valve body rear section and a branch water pipe, the upper part of the valve body front section is connected to the side wall of the main water pipe, the lower part is connected to one end of the valve body rear section, the other end of the valve body rear section is connected to one end of the branch water pipe, a water port is arranged near the center of the valve body front section, the inner diameter of the water port is smaller than the inner diameter of the valve body front section, an active opening and closing component is arranged on the upper part of the valve body front section, an anti-backflow component is arranged at the position of the lower part of the valve body front section and the valve body rear section, the anti-backflow component includes a compression spring, a first piston and a connecting spring. The first piston has a diameter larger than the inner diameter of the water inlet and is horizontally arranged inside the front section of the valve body. A bracket is arranged at the bottom of the first piston. The upper end of the compression spring is connected to the bottom of the bracket, and the lower end is connected to the bottom of the front section of the valve body. A circle of guide plates is arranged on the inner side wall of the rear section of the valve body. A plurality of guide holes are evenly arranged at the root of the rear section of the valve body and the corresponding guide plates facing the branch water pipe, and a first water guide box is arranged outside the guide hole. A plurality of back flushing holes are evenly opened near the bottom of the front section of the valve body, and a second water guide box is arranged outside the back flushing hole. The first water guide box is connected to the second water guide box through a connecting pipe.
[0006] Preferably, the inner circle of the guide plate is inclined toward one side of the branch water pipe, the inner side of the guide hole is inclined toward one side of the branch water pipe, and the inner side of the backwash hole is inclined toward one side of the first piston.
[0007] Preferably, the active opening and closing assembly includes a handle, a limit block, a threaded rod and a second piston. The limit block is fixedly arranged at the top of the front section of the valve body. A through threaded hole is provided between the limit block and the center position of the top of the front section of the valve body. 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 position of the upper surface of the second piston. The diameter of the second piston is larger than the inner diameter of the water outlet.
[0008] Preferably, a groove is formed on the side wall of the top of the front section of the valve body, and the diameter of the groove is larger than the diameter of the second piston.
[0009] Preferably, the bottom of the front section of the valve body is arranged to be open, and a sealing cover is detachably provided thereon, and the lower end of the compression spring is connected to the center position of the sealing cover.
[0010] The utility model provides a bypass valve for preventing backflow, which has the following beneficial effects:
[0011] When backflow occurs in the branch water pipe of the utility model, the guide plate guides the backflow water from the guide hole along the connecting pipe to the backwash hole, and flushes it to the bottom of the piston so that it cooperates with the elastic force of the spring to quickly reset and block the water outlet, thereby preventing the water in the branch water pipe from flowing back. The utility model has high sensitivity and good backflow prevention effect. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Figure 1 It is a front cross-sectional view of the utility model.
[0013] In the figure: 1. main water pipe; 2. front section of valve body; 3. rear section of valve body; 4. branch water pipe; 5. first piston; 6. bracket; 7. compression spring; 8. sealing cover; 9. back-flushing hole; 10. second water guide box; 11. connecting pipe; 12. first water guide box; 13. guide hole; 14. guide plate; 15. second piston; 16. threaded rod; 17. handle; 18. limit block; 19. groove; 20. water outlet. DETAILED DESCRIPTION
[0014] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0015] like Figure 1As shown, a bypass valve for preventing backflow includes a main water pipe 1, a valve body front section 2, a valve body rear section 3 and a branch water pipe 4. The upper part of the valve body front section 2 is communicated with the side wall of the main water pipe 1, and the lower part is communicated with one end of the valve body rear section 3. The other end of the valve body rear section 3 is connected to one end of the branch water pipe 4. A water inlet 20 is arranged near the center of the valve body front section 2. The inner diameter of the water inlet 20 is smaller than the inner diameter of the valve body front section 2. An active opening and closing component is arranged on the upper part of the valve body front section 2. An anti-backflow component is arranged at the position of the lower part of the valve body front section 2 and the valve body rear section 3. The anti-backflow component includes A compression spring 7, a first piston 5 and a connecting pipe 11, wherein the diameter of the first piston 5 is larger than the inner diameter of the water inlet 20 and is horizontally arranged inside the front section 2 of the valve body, a bracket 6 is arranged at the bottom of the first piston 5, the upper end of the compression spring 7 is connected to the bottom of the bracket 6, and the lower end is connected to the bottom of the front section 2 of the valve body, a circle of guide plates 14 are arranged on the inner side wall of the rear section 3 of the valve body, a plurality of guide holes 13 are evenly arranged at the root of the rear section 3 of the valve body and the corresponding guide plate 14 facing the branch water pipe 4, and a first water guide box 12 is arranged outside the guide hole 13, and the valve body A plurality of back-flushing holes 9 are evenly provided near the bottom of the front section 2, and a second water guide box 10 is provided outside the back-flushing hole 9, and the first water guide box 12 is connected to the second water guide box 10 through a connecting pipe 11; the inner circle of the guide plate 14 is inclined toward one side of the branch water pipe 4, the inner side of the guide hole 13 is inclined toward one side of the branch water pipe 4, and the inner side of the back-flushing hole 9 is inclined toward one side of the first piston 5; the active opening and closing assembly includes a handle 17, a limit block 18, a threaded rod 16 and a second piston 15, the limit block 18 is fixedly arranged on the top of the front section 2 of the valve body, and the A through threaded hole is provided between the limit block 18 and the center position of the top of the front section 2 of the valve body, and the threaded rod 16 is screwed into the threaded hole. The upper end of the threaded rod 16 is connected to the handle 17, and the lower end is connected to the center position of the upper surface of the second piston 15. The diameter of the second piston 15 is larger than the inner diameter of the water outlet 20; a groove 19 is provided on the side wall of the top of the front section 2 of the valve body, and the diameter of the groove 19 is larger than the diameter of the second piston 15; the bottom of the front section 2 of the valve body is set to be open, and a sealing cover 8 is detachably provided, and the lower end of the compression spring 7 is connected to the center position of the sealing cover 8.
[0016] The detailed connection means are well-known in the art. The following mainly introduces the working principle and process, which are as follows:
[0017] According to the instruction manual Figure 1It can be known that when the utility model is working, the active opening and closing component is opened as needed, and water from the main water pipe 1 flows to the front section 2 of the valve body. Due to the existence of water pressure, the first piston 5 can be pushed to move downward, the compression spring 7 is compressed, and the first piston 5 no longer blocks the water inlet 20, so that the front section 2 of the valve body and the rear section 3 of the valve body are opened, and water flows from the front section 2 of the valve body to the rear section 3 of the valve body and into the branch water pipe 4. The water pressure is stable, and the first piston 5 is lower than the lower edge of the rear section 3 of the valve body, and it works normally. When the main water pipe 1 is suddenly cut off from water, the water pressure is lost instantly, and the water in the branch water pipe 4 will instantly flow back. A part of the water in the branch water pipe 4 is intercepted by the guide plate 14 of the rear section 3 of the valve body, so that it enters the guide hole 13 and flows to the second water guide box 10 through the first water guide box 12 and the connecting pipe 11. The water in the second water guide box 10 enters the bottom of the front section 2 of the valve body through the backwash hole 9. The flowing water rushes to the bottom of the first piston 5, giving the second piston 15 an upward force. Together with the restoring force of the compression spring 7, the first piston 5 can be instantly reset to block the water outlet 20, thereby preventing the water in the branch water pipe 4 from flowing back. The sensitivity is high and the anti-backflow effect is good.
[0018] Among them, the inner circle of the guide plate 14 is inclined toward one side of the branch water pipe 4, the inner side of the guide hole 13 is inclined toward one side of the branch water pipe 4, and the inner side of the backwash hole 9 is inclined toward one side of the first piston 5. The inclined design of the guide plate 14 and the guide hole 13 allows the return water to be quickly collected and enter the backwash hole 9. The inclined design of the backwash hole 9 allows the return water to directly rush to the bottom of the first piston 5, giving it a larger upward force, thereby avoiding the first piston 5 from moving slowly and affecting the return effect.
[0019] Among them, the active opening and closing component includes a handle 17, a limit block 18, a threaded rod 16 and a second piston 15. When in use, a person twists the handle 17 to drive the threaded rod 16 to rotate. Since the threaded rod 16 is screwed into the threaded hole, rotating the threaded rod 16 can make it move up and down, thereby driving the second piston 15 to move up and down. Since the diameter of the second piston 15 is larger than the inner diameter of the water outlet 20, it can be blocked by moving down to the water outlet 20, which is the state of closing the bypass valve, and vice versa. In addition, a groove 19 is provided on the side wall of the top of the front section 2 of the valve body. The diameter of the groove 19 is larger than the diameter of the second piston 15. When it is opened, the second piston 15 can enter the groove 19, so as not to affect the normal water flow effect.
[0020] Among them, the bottom of the front section 2 of the valve body is set to be an opening, and a sealing cover 8 is detachably provided. The lower end of the compression spring 7 is connected to the center position of the sealing cover 8, and it is made into a detachable connection to facilitate the replacement of the compression spring 7, so that it can maintain a good elastic state and ensure the normal operation of the anti-backflow work.
[0021] Sealing design is common knowledge to those skilled in the art, so the present invention does not describe the sealing components required for valve connection and assembly.
[0022] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.
Claims
1. A bypass valve for preventing backflow, characterized in that: The invention comprises a main water pipe (1), a valve body front section (2), a valve body rear section (3) and a branch water pipe (4); the upper part of the valve body front section (2) is communicated with the side wall of the main water pipe (1), the lower part is communicated with one end of the valve body rear section (3), the other end of the valve body rear section (3) is connected with one end of the branch water pipe (4), a water inlet (20) is arranged near the center of the valve body front section (2), the inner diameter of the water inlet (20) is smaller than the inner diameter of the valve body front section (2), an active opening and closing component is arranged at the upper part of the valve body front section (2), an anti-backflow component is arranged at the position of the lower part of the valve body front section (2) and the valve body rear section (3), the anti-backflow component comprises a compression spring (7), a first piston (5) and a connecting pipe (11), the diameter of the first piston (5) is larger than the inner diameter of the water inlet (20), and The valve body is horizontally arranged inside the front section (2) of the valve body. A bracket (6) is arranged at the bottom of the first piston (5). The upper end of the compression spring (7) is connected to the bottom of the bracket (6), and the lower end is connected to the bottom of the front section (2) of the valve body. A circle of guide plates (14) are arranged on the inner side wall of the rear section (3) of the valve body. A plurality of guide holes (13) are evenly arranged at the root of the rear section (3) of the valve body and the corresponding guide plates (14) facing the branch water pipe (4), and a first water guide box (12) is arranged outside the guide hole (13). A plurality of backwash holes (9) are evenly opened near the bottom of the front section (2) of the valve body, and a second water guide box (10) is arranged outside the backwash hole (9). The first water guide box (12) and the second water guide box (10) are connected through a connecting pipe (11).
2. The bypass valve for preventing backflow according to claim 1, characterized in that: The inner circle of the guide plate (14) is inclined toward one side of the branch water pipe (4), the inner side of the guide hole (13) is inclined toward one side of the branch water pipe (4), and the inner side of the backwash hole (9) is inclined toward one side of the first piston (5).
3. The bypass valve for preventing backflow according to claim 1, characterized in that: The active opening and closing component comprises a handle (17), a limit block (18), a threaded rod (16) and a second piston (15); the limit block (18) is fixedly arranged at the top of the valve body front section (2); a threaded hole is provided at the center position of the limit block (18) and the top of the valve body front section (2); the threaded rod (16) is screwed into the threaded hole; the upper end of the threaded rod (16) is connected to the handle (17), and the lower end is connected to the center position of the upper surface of the second piston (15); the diameter of the second piston (15) is larger than the inner diameter of the water outlet (20).
4. The bypass valve for preventing backflow according to claim 3, characterized in that: A groove (19) is formed on the side wall of the top of the front section (2) of the valve body, and the diameter of the groove (19) is greater than the diameter of the second piston (15).
5. The bypass valve for preventing backflow according to claim 1, characterized in that: The bottom of the front section (2) of the valve body is arranged to be open and is provided with a detachable sealing cover (8), and the lower end of the compression spring (7) is connected to the center position of the sealing cover (8).