An anti-siphon backflow flush valve

Abstract

This application relates to an anti-siphon reflux flushing valve, which includes an inlet valve body, an upper flushing valve body and a lower flushing valve body; an inlet cavity is arranged in the inlet valve body, and an upper flushing cavity and a lower flushing cavity communicated with the inlet cavity are respectively arranged in the upper flushing valve body and the lower flushing valve body; solenoid valves are arranged on both the upper flushing valve body and the lower flushing valve body; a conduction pipe is arranged between the upper flushing valve body and the lower flushing valve body, and the conduction pipe communicates the upper flushing cavity and the lower flushing cavity, so that a normally open flow channel is formed between the upper flushing water outlet and the lower flushing water outlet of the toilet, achieving the effect of pressure relief and emptying, and enabling the accumulated water in the upper flushing and lower flushing water pipes to directly drain downward into the sewage pool through the lower flushing port. When the toilet is in a static state and the water supply network stops supplying water while the toilet is installed at a high position on the floor, the water supply network will only suck air from the upper flushing water outlet through the conduction pipe, and will not suck back the accumulated water or dirt in the storage pool, fundamentally eliminating the possibility of polluting the public water supply network system during siphon reflux.

Description

Technical Field

[0001] This application relates to the technical field of flush valves, and particularly to an anti-siphon backflow flush valve. Background Art

[0002] In the market, the jet siphon toilet is provided with two upper and lower flush water outlets. The water flow ejected from the upper flush water outlet flows downward in a vortex shape; the lower flush water outlet is located in the cistern and is aligned with the sewage outlet. The water flows in the upper and lower flush water outlets are flushed through two independent and unconnected solenoid valves. When flushing, the water flow is first ejected from the upper flush water outlet to wash the pool wall, then the upper flush water outlet stops flushing, and the lower flush water outlet ejects water flow to form a siphon to directly flush the dirt into the sewage outlet. After flushing, the two independent upper and lower flush water pipes are kept in a full pipe state due to the atmospheric pressure for the next cycle.

[0003] The above-mentioned jet siphon toilet is usually equipped with a flush valve that has two water flow channels and two electromagnetic control valves at the same time. The flush valve includes an inlet valve body, and left and right electromagnetic flush valve bodies connected in series on the left and right sides of the inlet valve body. The water inlets of the two electromagnetic flush valve bodies are respectively connected to the two water outlets on both sides of the inlet valve body. Generally, a vacuum breaker is also provided at the upper end of the inlet valve body. An anti-siphon valve piece that can be automatically opened and closed according to the internal and external air pressures is provided in the vacuum breaker. When the toilet starts flushing and the water supply network stops supplying water, the air pressure in the inlet valve body is less than the external atmospheric pressure, then the anti-siphon valve piece opens, releasing the external air into the inlet valve body to prevent the sewage in the cistern from being sucked back into the water supply network due to negative pressure.

[0004] Regarding the above related technologies, the inventor believes that: the anti-siphon backflow function of the above-mentioned flush valve entirely depends on the vacuum breaker, and the structure of the vacuum breaker on the flush valve is usually relatively simple and fragile, and a part of the structure is exposed to the outside, and it is easy to cause the anti-siphon valve piece to get stuck due to foreign objects or structural strength problems. If the anti-siphon valve piece gets stuck or the anti-siphon effect is not good and cannot be opened, the sewage in the cistern will show a siphon backflow phenomenon when the water supply network stops supplying water, polluting the tap water system. Summary of the Invention

[0005] In order to improve the stability of the anti-siphon backflow function of the flush valve, this application provides an anti-siphon backflow flush valve.

[0006] An anti-siphon backflow flush valve provided by this application adopts the following technical solutions:

[0007] An anti-siphon backflow flush valve, comprising a water inlet valve body, an upper flush valve body and a lower flush valve body respectively arranged at both ends of the water inlet valve body; a water inlet cavity is arranged in the water inlet valve body, and a water inlet is arranged at the lower end of the water inlet valve body; an upper flush cavity and a lower flush cavity communicated with the water inlet cavity are respectively arranged in the upper flush valve body and the lower flush valve body, and an upper water outlet and a lower water outlet are respectively arranged at the lower ends of the upper flush valve body and the lower flush valve body; electromagnetic valves are arranged on both the upper flush valve body and the lower flush valve body; a conduction pipe is arranged between the upper flush valve body and the lower flush valve body, and the conduction pipe communicates the upper flush cavity and the lower flush cavity.

[0008] By adopting the above technical solution, the upper flush cavity and the lower flush cavity are directly communicated by the conduction pipe, so that a normally open flow channel is formed between the upper flush water outlet and the lower flush water outlet of the toilet, achieving the effect of pressure relief and emptying. After each flushing of the toilet, both electromagnetic valves are closed. Since the upper flush water outlet of the toilet is communicated with the outside air, and the position of the conduction pipe is higher than the water surface height of the toilet cistern, the accumulated water in the upper flush cavity, the conduction pipe and the lower flush cavity can be free from the influence of the pressure generated by the atmosphere after the electromagnetic valves are closed, enabling the accumulated water in the upper and lower flush water pipes to directly drain downward through the lower flush port into the cistern and communicate with the atmosphere. When the toilet is stationary and the water supply network stops supplying water, the water supply network will only suck air from the upper flush water outlet through the conduction pipe, and will not suck back the accumulated water or dirt in the cistern, fundamentally eliminating the possibility of siphon backflow.

[0009] Optionally, the conduction pipe is arranged on one side of the water inlet valve body, the upper flush valve body and the lower flush valve body, and both ends of the conduction pipe penetrate from the outside into the upper flush cavity and the lower flush cavity respectively.

[0010] By adopting the above technical solution, the conduction pipe communicates the upper flush cavity and the lower flush cavity from the outside, reducing the influence of the conduction pipe on the water flow in the water inlet cavity.

[0011] Optionally, connection holes penetrating from the inner wall of the flush cavity towards the outside are arranged on both the upper flush valve body and the lower flush valve body, and both ends of the conduction pipe are detachably connected to the two connection holes respectively.

[0012] By adopting the above technical solution, it is convenient to disassemble and replace the conduction pipe, and both the conduction pipe and the valve body are convenient to process and manufacture.

[0013] Optionally, the conduction pipe is a transparent pipe made of a transparent material.

[0014] By adopting the above technical solution, the transparent conduction pipe is convenient for users to observe the flow direction of the internal liquid and confirm whether the flush cavity is emptied.

[0015] Optionally, the upper flush valve body, the water inlet valve body and the lower flush valve body are an integral body formed by injection molding; the conduction pipe is integrally formed on the upper flush valve body and the lower flush valve body.

[0016] By adopting the above technical solution, the integrally formed setting enhances the structural strength at the connection between the water inlet valve body and the two flushing valve bodies, and also enhances the overall structural strength of the valve body and the conduction pipe, and reduces the step cost of processing and manufacturing.

[0017] Optionally, an extension portion extending to the end of the long hole section is provided on the plugging member, and a sealing ring is provided between the extension portion and the end of the long hole section.

[0018] By adopting the above technical solution, when installing the plugging member, the two ends of the long hole section are directly plugged, and the structure is simple and easy to operate.

[0019] Optionally, a reinforcing rib extending along the length direction of the water inlet cavity is provided between the outer side wall of the guide cylinder and the inner wall of the water inlet cavity, and the short hole section passes through the inside of the reinforcing rib.

[0020] By adopting the above technical solution, the reinforcing rib is used to enhance the structural strength between the guide cylinder and the valve body. At the same time, as a carrier of the conduction pipe, the short hole section can pass through the reinforcing rib, which is convenient for integral molding; and the reinforcing rib can also be injection molded through the core pulling port.

[0021] In summary, the present application includes at least one of the following beneficial technical effects:

[0022] 1. The upper flushing cavity and the lower flushing cavity are directly connected by the conduction pipe, so that a normally open flow channel is formed between the upper flushing water port and the lower flushing water port of the toilet, achieving the effect of pressure relief and emptying. When the toilet flushes each time, both solenoid valves are closed. Since the upper flushing water port of the toilet is connected to the outside air, and the position of the conduction pipe is higher than the water surface height of the toilet cistern, the accumulated water in the upper flushing cavity, the conduction pipe, and the lower flushing cavity can be unaffected by the pressure generated by the atmosphere after the solenoid valves are closed, so that the accumulated water in the upper and lower flushing pipes can directly drain downward through the lower flushing port into the cistern and communicate with the atmosphere. When the toilet is stationary and the water supply network stops supplying water, the water supply network will only suck air from the upper flushing water port through the conduction pipe, and will not suck back the accumulated water or dirt in the cistern, eliminating the possibility of siphon backflow from the source;

[0023] 2. The integrally formed setting enhances the structural strength at the connection between the water inlet valve body and the two flushing valve bodies, and also enhances the overall structural strength of the valve body and the conduction pipe, and reduces the step cost of processing and manufacturing. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is the overall structural schematic diagram of Embodiment 1 of the present application;

[0025] Figure 2 is the cross-sectional view of the water inlet valve body and the flushing valve body of Embodiment 1 of the present application on the side opposite to the conduction pipe;

[0026] Figure 3 It is an exploded structural schematic diagram of a flushing valve body, a valve cover, a valve core and a solenoid valve according to the first embodiment of the present application;

[0027] Figure 4 It is a partial sectional schematic diagram of the valve cover according to the first embodiment of the present application;

[0028] Figure 5 It is a structural schematic diagram of one side of the core-pulling port of the flushing valve body according to the first embodiment of the present application;

[0029] Figure 6 It is a structural schematic diagram of the second embodiment of the present application.

[0030] Explanation of reference numerals: 1, inlet valve body; 11, inlet cavity; 111, reinforcing rib; 12, water inlet; 2, upper flushing valve body; 21, guide cylinder; 22, upper flushing cavity; 23, upper water outlet; 24, core-pulling port; 25, connection hole; 3, lower flushing valve body; 31, lower flushing cavity; 32, lower water outlet; 4, valve core; 41, valve cavity; 5, solenoid valve; 51, movable rod; 6, conduction pipe; 61, long hole section; 62, short hole section; 63, through hole; 7, valve cover; 71, sealing plate; 711, extension part; 72, mounting plate; 721, control cavity; 722, control channel; 723, pressure relief channel. Detailed implementation manners

[0031] The following will further describe the present application in detail with reference to the Figure 1-6 accompanying drawings.

[0032] The embodiment of the present application discloses an anti-siphonage and backflow flushing valve. Referring to Figure 1 、 Figure 2 , it includes an inlet valve body 1, and an upper flushing valve body 2 and a lower flushing valve body 3 symmetrically arranged at both ends of the inlet valve body 1. Among them, an inlet cavity 11 is formed in the inlet valve body 1 by injection molding, and a water inlet 12 is formed at the lower end of the inlet valve body 1. The water inlet 12 is used to connect to the tap water pipe network to realize water supply; an upper flushing cavity 22 and a lower flushing cavity 31 are respectively formed in the upper flushing valve body 2 and the lower flushing valve body 3 by injection molding. The upper flushing cavity 22 and the lower flushing cavity 31 are respectively communicated with both ends of the inlet cavity 11, and upper water outlets 23 and lower water outlets 32 are respectively formed at the lower ends of the upper flushing valve body 2 and the lower flushing valve body 3. The upper water outlets 23 and the lower water outlets 32 are respectively communicated with the upper flushing pipe and the lower flushing pipe of the toilet. One solenoid valve 5 is installed on each of the upper flushing valve body 2 and the lower flushing valve body 3, and the two solenoid valves 5 are respectively used to control the flushing valve to flush water into the upper flushing pipe and the lower flushing pipe of the toilet.

[0033] Embodiment 1, referring to Figure 1 、 Figure 2, the water inlet valve body 1 and the upper flushing valve bodies 2 and lower flushing valve bodies 3 on both sides are integrally injection-molded. A conduction pipe 6 is connected between the upper flushing valve body 2 and the lower flushing valve body 3. The conduction pipe 6 is integrally injection-molded on one side of the water inlet valve body 1 and the two flushing valve bodies, directly connecting the upper flushing cavity 22 and the lower flushing cavity 31 through the conduction pipe 6, so that a normally open flow channel is formed between the upper flushing water outlet and the lower flushing water outlet of the toilet, achieving the effect of pressure relief and emptying.

[0034] The conduction pipe 6 includes a long hole section 61 extending along the length direction of the water inlet cavity 11 and a short hole section 62 connecting the long hole section 61 and the flushing cavity. The long hole section 61 is located outside the water inlet valve body 1 and both ends are penetrated; while the two short hole sections 62 penetrate from the outside into the upper flushing cavity 22 and the lower flushing cavity 31, and through holes 63 are provided on the outer wall of the conduction pipe 6 in the extension direction of the short hole section 62, enabling the conduction pipe 6 to be integrally injection-molded with the valve body by means of core pulling, thereby obtaining higher structural strength and stability.

[0035] Refer to Figure 2 , Figure 3 , on the lateral ends of the upper flushing valve body 2 and the lower flushing valve body 3 away from the water inlet valve body 1, core pulling ports 24 are integrally formed, and two guide cylinders 21 extending towards the core pulling ports 24 on both sides are integrally formed in the water inlet cavity 11. One end of the guide cylinder 21 located in the water inlet cavity 11 is sealed, and the water inlet 12 is communicated at the position between the two guide cylinders 21 in the water inlet cavity 11; the water inlet cavity 11 extends along the outer sides of the two guide cylinders 21 into the upper flushing valve body 2 and the lower flushing valve body 3 on both sides and penetrates to the core pulling ports 24; while the upper flushing cavity 22 and the lower flushing cavity 31 are respectively located inside the two corresponding guide cylinders 21 and also penetrate towards the core pulling ports 24, so that the water inlet cavity 11 is communicated with the upper flushing cavity 22 and the lower flushing cavity 31 on both sides at the corresponding core pulling ports 24 respectively.

[0036] Refer to Figure 3 , Figure 5 , between the outer wall of the guide cylinder 21 and the inner wall of the water inlet cavity 11, reinforcing ribs 111 extending along the length direction of the guide cylinder 21 are provided, and the short hole section 62 passes through the inside of the reinforcing ribs 111. The reinforcing ribs 111 are used to enhance the structural strength between the guide cylinder 21 and the valve body, and at the same time as the carrier of the conduction pipe 6, enabling the short hole section 62 to pass through the inside of the reinforcing ribs 111, facilitating integral molding; and the reinforcing ribs 111 can also be injection-molded through the core pulling ports 24.

[0037] Refer to Figure 2 , Figure 3, valve covers 7 can be detachably installed at the core-pulling ports 24 on both sides, and valve cores 4 are arranged at the openings of the upper flushing cavity 22 and the lower flushing cavity 31. The valve core 4 in this embodiment is a water-sealing diaphragm assembly, and a valve cavity 41 is formed between the valve core 4 and the valve cover 7. This facilitates the side core to be directly inserted into the communication area between the water inlet cavity 11 and the flushing cavity from both ends, so that the water inlet valve body 1, the upper flushing valve body 2, and the lower flushing valve body 3 can be directly injection-molded into a whole, enhancing the structural strength of the connection between the water inlet valve body 1 and the two flushing valve bodies.

[0038] Refer to Figure 2 , Figure 3 , the cross-section of the valve cover 7 is L-shaped, including a sealing plate 71 and a mounting plate 72 that are perpendicular to each other. The sealing plate 71 is installed at the core-pulling port 24 to block it, and the mounting plate 72 extends horizontally towards the water inlet valve body 1 at the upper end of the upper flushing valve body 2 or the lower flushing valve body 3. The solenoid valves 5 are installed on the mounting plate 72, with the two solenoid valves 5 facing the same side, so that its structural layout is similar to that of a conventional flushing valve, reducing the occupied space of the whole flushing valve.

[0039] Refer to Figure 3 , Figure 4 , a control cavity 721 is formed on the side end face of the mounting plate 72 facing the solenoid valve 5, and a control channel 722 and a pressure relief channel 723 extending from the mounting plate 72 to the sealing plate 71 are formed inside the valve cover 7. The control channel 722 and the pressure relief channel 723 also extend in an L shape. Among them, one end of the control channel 722 communicates with the control cavity 721, and the other end communicates with the valve cavity 41. One end of the pressure relief channel 723 communicates with the control cavity 721, and the other end communicates with the upper water outlet 23 or the lower water outlet 32 on the corresponding side. A magnetically attractable movable rod 51 is slidably arranged inside the solenoid valve 5. By the blocking action of the movable rod 51, it can be controlled whether the ends of the pressure relief channel 723 and the control channel 722 located in the control cavity 721 are communicated, so as to realize the flushing function.

[0040] Embodiment 2, refer to Figure 2 , Figure 6 , the difference between this embodiment and Embodiment 1 is that the water inlet valve body 1 and the upper flushing valve bodies 2 and the lower flushing valve bodies 3 on both sides can be integrally formed, or can be detachably connected by bolts and nuts in a split manner. Connecting holes 25 penetrating from the inner wall of the flushing cavity to the outside are formed on the outer walls of the upper flushing valve body 2 and the lower flushing valve body 3, and both ends of the conduction pipe 6 are respectively inserted into the two connecting holes 25 and then fixed by a screw sleeve or other fasteners, achieving the effect of facilitating disassembly and replacement.

[0041] Embodiment 3. The difference between this embodiment and Embodiment 2 is that the conducting pipe 6 is a transparent pipe made of a transparent material. The transparent conducting pipe 6 facilitates the user to observe the flow direction of the internal liquid and confirm whether the upper flushing cavity 22 and the lower flushing cavity 31 are emptied. In the solution where the conducting pipe 6 is integrally formed with the valve body, the conducting pipe 6 can be integrally formed on the valve body by a two-color injection molding process.

[0042] The implementation principles of the three embodiments of this application are as follows: After each flushing of the toilet, both solenoid valves 5 are closed. Since the upper flushing port of the toilet is connected to the outside air and the position of the conducting pipe 6 is higher than the water surface height of the toilet cistern, the accumulated water in the upper flushing cavity 22, the conducting pipe 6, and the lower flushing cavity 31 can be unaffected by the negative pressure generated by the closing of the solenoid valve 5, so that the accumulated water can directly drain downward into the cistern through the lower flushing port. When the water supply network stops supplying water, the water supply network will only suck air from the upper flushing port through the conducting pipe 6, and will not suck back the accumulated water or dirt in the cistern, fundamentally eliminating the possibility of siphon backflow.

[0043] The above are all the preferred embodiments of this application, and the protection scope of this application is not limited accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of this application should be covered within the protection scope of this application.

Claims

1. An anti-siphon backflow flush valve, comprising a water inlet valve body (1), an upper flush valve body (2) and a lower flush valve body (3) respectively arranged at both ends of the water inlet valve body (1); a water inlet cavity (11) is arranged in the water inlet valve body (1), and a water inlet (12) is arranged at the lower end of the water inlet valve body (1); an upper flush cavity (22) and a lower flush cavity (31) communicated with the water inlet cavity (11) are respectively arranged in the upper flush valve body (2) and the lower flush valve body (3), and an upper water outlet (23) and a lower water outlet (32) are respectively arranged at the lower ends of the upper flush valve body (2) and the lower flush valve body (3); solenoid valves (5) are arranged on both the upper flush valve body (2) and the lower flush valve body (3); Characterized in that: A conduction pipe (6) is arranged between the upper flush valve body (2) and the lower flush valve body (3), and the conduction pipe (6) communicates the upper flush cavity (22) and the lower flush cavity (31); the conduction pipe (6) is arranged on one side of the water inlet valve body (1), the upper flush valve body (2) and the lower flush valve body (3), and both ends of the conduction pipe (6) penetrate from the outside into the upper flush cavity (22) and the lower flush cavity (31) respectively; the upper flush valve body (2), the water inlet valve body (1) and the lower flush valve body (3) are an integral body formed by injection molding; the conduction pipe (6) is integrally formed on the upper flush valve body (2) and the lower flush valve body (3).

2. An anti-siphon backflow flush valve according to claim 1, Characterized in that: Connection holes (25) penetrating from the inner wall of the flush cavity towards the outside are arranged on both the upper flush valve body (2) and the lower flush valve body (3), and both ends of the conduction pipe (6) are detachably connected to the two connection holes (25) respectively.

3. An anti-siphon backflow flush valve according to claim 1, Characterized in that: The conduction pipe (6) is a transparent pipe made of a transparent material.

4. An anti-siphon backflow flush valve according to claim 1, Characterized in that: Core extraction ports (24) are arranged at one ends of the upper flush valve body (2) and the lower flush valve body (3) away from the water inlet valve body (1), and a plugging member is arranged at the core extraction ports (24); the conduction pipe (6) includes a long hole section (61) extending along the length direction of the water inlet cavity (11) and a short hole section (62) communicating the long hole section (61) with the flush cavity; both ends of the long hole section (61) are penetrated; through holes (63) are arranged on the outer wall of the conduction pipe (6) in the extending direction of the short hole section (62); both the openings at both ends of the long hole section (61) and the through holes (63) are hermetically arranged.

5. An anti-siphon backflow flush valve according to claim 4, Characterized in that: An extension part (711) extending to the end of the long hole section (61) is arranged on the plugging member, and a sealing ring is arranged between the extension part (711) and the end of the long hole section (61).

6. An anti-siphon backflow flush valve according to claim 4, Characterized in that: Two flow guide cylinders (21) integrally formed in the water inlet cavity (11) extend towards the core pulling ports (24) on both sides respectively; one end of the flow guide cylinder (21) located in the water inlet cavity (11) is sealed, and the water inlet cavity (11) communicates with the water inlet (12) at the position between the two flow guide cylinders (21); the water inlet cavity (11) extends along the outer sides of the two flow guide cylinders (21) into the upper punch valve body (2) and the lower punch valve body (3) on both sides and penetrates to the core pulling port (24); the upper water flushing cavity (22) and the lower water flushing cavity (31) are respectively located inside the two corresponding flow guide cylinders (21) and also penetrate towards the core pulling port (24), so that the water inlet cavity (11) is communicated with the upper water flushing cavities (22) and the lower water flushing cavities (31) on both sides at the corresponding core pulling ports (24); a reinforcing rib (111) extending along the length direction of the water inlet cavity (11) is arranged between the outer side wall of the flow guide cylinder (21) and the inner wall of the water inlet cavity (11), and the short hole section (62) passes through the inside of the reinforcing rib (111).

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