Anti-reflux switching valve

Abstract

The application discloses a backflow prevention switching valve, which comprises a pipeline, a water inlet mechanism arranged at the front end of the pipeline, a backflow prevention mechanism arranged at the rear end of the pipeline, a water outlet mechanism arranged at the upper end of the pipeline and a switching mechanism arranged at the lower end of the pipeline and used for adjusting the water outlet position of the water outlet mechanism. The backflow prevention flushing valve has the advantages of single backflow prevention structure, compact structure, convenient installation, high space utilization, less processing steps, high reliability and high yield.

Description

Technical Field

[0001] This invention relates to the field of valve technology, and in particular to an anti-backflow switching valve. Background Technology

[0002] Currently, toilets require a flush valve as a component. Most existing toilet flush valves adopt a two-way anti-backflow structure. However, the disadvantages of this structure are that it requires a large space and volume, which affects the internal layout of the toilet. In addition, the processing cost is high, there are many process steps, and the yield rate is low. Summary of the Invention

[0003] The present invention aims to solve the problems existing in the prior art by providing an anti-backflow switching valve to address the issues raised in the background art.

[0004] The technical solution adopted by the present invention to solve its technical problem is as follows: This anti-backflow switching valve includes a pipe, an inlet mechanism installed at the front end of the pipe, an anti-backflow mechanism installed at the rear end of the pipe to prevent backflow of liquid in the pipe, an outlet mechanism installed at the upper end of the pipe, and a switching mechanism for adjusting the water outlet position of the outlet mechanism installed at the lower end of the pipe.

[0005] To further improve the design, the water inlet mechanism includes an inlet tank integrally molded and fixedly installed at the front end of the pipe. A diverter cylinder connected to the pipe is fixedly installed on the top of the inner wall of the inlet tank. An inlet conduit connected to the inlet tank is fixedly installed at the front end of the inlet tank. The inlet tank is equipped with a pressure plate that can seal the bottom of the diverter cylinder. Lower sealing rings are fixedly installed on both sides of the pressure plate. The outer side of the lower sealing rings is sealed and fixedly connected to the inner wall of the inlet tank. The pressure plate is provided with a lower pressure hole. A lower spring is fixedly installed on the pressure plate and the bottom inner wall of the inlet tank. The inlet tank is provided with a sealing cavity connected to the outside. The inlet tank is provided with a first guide channel connecting the sealing cavity and the bottom inner wall of the inlet tank. The inlet tank is provided with a countersunk cavity connected to the sealing cavity. The inner wall of the countersunk cavity is provided with a second guide channel connecting to the inside of the pipe. A plug that can block the countersunk cavity and prevent it from communicating with the sealing cavity is slidably sealed to the inner wall of the sealing cavity. This structure functions as a valve, allowing water to flow only when the plug blocks the submerged cavity, thus pressurizing the pressure plate to initiate the water intake operation.

[0006] Further improvements include an anti-backflow mechanism comprising an anti-backflow chamber, a frame slidably connected to the inner wall of the pipe, an anti-backflow plate fixedly installed on the frame to block the other end of the pipe, a negative pressure balancing hole communicating with the outside of the anti-backflow chamber, a support plate on the inner wall of the anti-backflow chamber, and guide rods corresponding to the negative pressure balancing hole fixedly installed in an array on the support plate, with plugging balls slidably positioned between the guide rods to block the negative pressure balancing hole. This structure can promptly replenish air when negative pressure is generated in the pipe, preventing the generation of negative pressure.

[0007] Further improvements include a water outlet mechanism comprising a delivery pipe fixedly connected to the top of a pipeline, a delivery connecting pipe fixedly installed on the delivery pipe communicating with an anti-backflow chamber, a left sealing box fixedly installed at the left end of the delivery pipe communicating with the delivery pipe, a first left water outlet pipe fixedly installed on the inner wall of the delivery pipe, a second left water outlet pipe fixedly installed on the first left water outlet pipe communicating with the first left water outlet pipe, a left cover plate connected to the left sealing box for sealing by blocking the first left water outlet pipe, a left sealing rubber ring fixedly installed on the outer side of the left cover plate and fixedly sealed to the inside of the left sealing box, a left spring fixedly installed on the left cover plate and the left inner wall of the left end of the left sealing box, and a left through hole provided on the left cover plate. This structure enables water to be output from the first left water outlet pipe.

[0008] Further improvements include a right sealing box fixedly installed at the right end of the conveying pipe, communicating with the conveying pipe; a first right water outlet pipe fixedly installed on the inner wall of the conveying pipe; a second right water outlet pipe fixedly installed on the first right water outlet pipe, communicating with the first right water outlet pipe; a right cover plate connected to the right sealing box for sealing and blocking the first right water outlet pipe; a right sealing ring fixedly installed on the outer side of the right cover plate, providing a sealing connection with the inner wall of the right sealing box; a right spring fixedly installed on the right cover plate and the inner wall of the right end of the right sealing box; and a right through hole provided on the right cover plate. This structure allows water to be output from the first right water outlet pipe.

[0009] Further improvements include a switching block located below the pipe, with a switching chamber inside the switching block. A left return channel is located at the front end of the switching chamber, and a left guide channel is located at the left end of the left return channel. A left connecting pipe is fixedly installed on the outside of the left sealing box, and a left drain hole communicating with the left connecting pipe is located at the left end of the left sealing box. A left drain pipe is securely connected to the bottom of the left connecting pipe and the left end of the left guide channel. This structure can temporarily close the first left outlet pipe.

[0010] Further improvements include a right return channel at the rear end of the switching chamber, a right guide channel at the right end of the right return channel, a right connecting pipe fixedly installed on the outside of the right sealing box, a right drain hole communicating with the right connecting pipe at the right end of the right sealing box, and a right drain pipe that can be sealed to the bottom of the right connecting pipe and the right end of the right guide channel. This structure can temporarily seal the first right outlet pipe.

[0011] Further improvements include a diversion conduit fixedly installed at the bottom of the delivery pipe, a diversion hole on the inner wall of the top of the diversion conduit connecting to the first right outlet pipe, a diversion sleeve at the right end of the switching block, a diversion connecting pipe sealingly connecting the diversion conduit and the diversion sleeve, a diversion channel at the front end of the switching chamber, and a diversion guide hole at the left end of the diversion sleeve communicating with the diversion channel. This structure allows water between the left cover plate and the left end of the left sealing box, as well as water between the right cover plate and the left ends of both sealing boxes, to be discharged uniformly through the first right outlet pipe.

[0012] Further improvements include a switching rod slidably connected to the switching block, whose front end passes through the right return channel and reaches the inside of the switching chamber. A baffle is fixedly installed at the front end of the switching rod to block either the left or right return channel. This structure allows water to flow from either the first left outlet pipe or the first right outlet pipe.

[0013] The beneficial effects of this invention are: the anti-backflow flushing valve of this invention adopts a single-path anti-backflow structure, which is compact, easy to install, greatly improves space utilization, has fewer processing steps, high reliability, and high yield. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a rear view of the present invention; Figure 3 This is an isometric sectional view of the water inlet mechanism in this invention; Figure 4 This is an isometric sectional view of the water outlet mechanism in this invention; Figure 5 This is a schematic diagram of the left guide channel in this invention; Figure 6 This is a schematic diagram of the right drainage hole in the present invention; Figure 7 This is a schematic diagram of the right guide channel in this invention; Figure 8 for Figure 3 A magnified view of a portion of the image; Figure 9 for Figure 4 Enlarged view of part C in the image; Figure 10 for Figure 4 A magnified view of part D in the image.

[0015] Figure 11 This is a schematic diagram of the switching cavity in this invention; Figure 12 This is a schematic diagram of the bottom structure of the right sealing box in this invention; Figure 13 This is a schematic diagram of the right sealing box in this invention.

[0016] Explanation of reference numerals in the attached drawings: Pipe 1, Inlet mechanism; 2, Anti-backflow mechanism; 3, Outlet mechanism; 4, Switching mechanism; 5, Diverter cylinder; 201, Sealing ring; 202, Inlet tank; 203, Lower spring; 204, First guide channel; 205, Countersunk cavity; 206, Sealing cavity; 207, Plug; 208, Second guide channel; 209, Pressure plate; 210, Lower pressure inlet hole; 211, Inlet conduit; 212, Anti-backflow cavity; 301, Anti-backflow plate; 302, Frame; 303, Support plate; 304, Guide rod; 305, Plug ball; 306, Negative pressure balance hole; 307, Delivery pipe; 401, Left through hole; 402, Delivery connecting pipe; 403, Left spring; 404, Left sealing ring; 405, Second left outlet pipe; 406, Left cover plate; 407. 408 First left water outlet pipe, 409 left sealing box, 410 first right water outlet pipe, 411 second right water outlet pipe, 412 right through hole, 413 right spring, 414 right cover plate, 415 right sealing ring, 416 right sealing box, 501 left drain hole, 502 left connecting pipe, 503 left drainage pipe, 504 left guide channel, 505 left return channel, 506 diversion channel, 507 diversion guide hole, 508 diversion connecting pipe, 509 diversion guide pipe, 510 diversion hole, 511 right drain hole, 512 right connecting pipe, 513 right return channel, 514 right guide channel, 515 right drainage pipe, 516 switching block, 517 switching chamber, 518 switching rod, 519 baffle, 520 diversion sleeve. Detailed Implementation

[0017] The present invention will be further described below with reference to the accompanying drawings: See attached document Figures 1-12In this embodiment, the anti-backflow switching valve includes a pipe 1. A water inlet mechanism 2 is installed at the front end of the pipe 1, and an anti-backflow mechanism 3 is installed at the rear end of the pipe 1 to prevent backflow of liquid within the pipe 1. A water outlet mechanism 4 is installed at the upper end of the pipe 1, and a switching mechanism 5 for adjusting the water outlet position is installed at the lower end of the pipe 1. The water inlet mechanism 2 includes a water inlet tank 203 integrally formed and fixedly installed at the front end of the pipe 1. A diverter cylinder 201 communicating with the pipe 1 is fixedly installed on the top of the inner wall of the water inlet tank 203. A water inlet conduit 212 communicating with the water inlet tank 203 is fixedly installed at the front end of the water inlet tank 203. A pressure plate 210 is provided inside the water inlet tank 203 to seal the bottom of the diverter cylinder 201. Lower sealing rings 202 are fixedly installed on both sides of the pressure plate 210, and the outer sides of the lower sealing rings 202 are sealed and fixedly connected to the inner wall of the water inlet tank 203. A lower pressure inlet hole 211 is provided on the pressure plate 210. The pressure plate 210 is fixedly installed with a lower spring 204 on the bottom inner wall of the water inlet tank 203; the water inlet tank 203 is provided with a sealing cavity 207 communicating with the outside; the water inlet tank 203 is provided with a first guide channel 205 communicating with the sealing cavity 207 and the bottom inner wall of the water inlet tank 203; the water inlet tank 203 is provided with a countersunk cavity 206 communicating with the sealing cavity 207; the inner wall of the countersunk cavity 206 is provided with a second guide channel 209 communicating with the inside of the pipe 1; the inner wall of the sealing cavity 207 is slidably sealed with a plug 208 that can block the countersunk cavity 206 so that it is not communicating with the sealing cavity 207. The anti-backflow mechanism 3 includes an anti-backflow cavity 301. A frame 303 is slidably connected to the inner wall of the pipe 1. An anti-backflow plate 302 capable of blocking the other end of the pipe 1 is fixedly installed on the frame 303. A negative pressure balance hole 307 communicating with the outside is provided on the anti-backflow cavity 301. A support plate 304 is provided on the inner wall of the anti-backflow cavity 301. Guide rods 305 corresponding to the negative pressure balance hole 307 are fixedly installed in an array on the support plate 304. A blocking ball 306 capable of blocking the negative pressure balance hole 307 is slidably positioned between the guide rods 305. The water outlet mechanism 4 includes a conveying pipe 401 fixedly connected to the top of the pipe 1. A conveying connecting pipe 403 connected to the anti-backflow cavity 301 is fixedly installed on the conveying pipe 401. A left sealing box 409 connected to the conveying pipe 401 is fixedly installed at the left end of the conveying pipe 401. A first left water outlet pipe 408 is fixedly installed on the inner wall of the conveying pipe 401. A second left water outlet pipe 406 connected to the first left water outlet pipe 408 is fixedly installed on the first left water outlet pipe 408. A left cover plate 407 connected to the left left water outlet pipe 408 is provided inside the left sealing box 409. A left sealing ring 405 fixedly connected to the left sealing box 409 is fixedly installed on the outer side of the left cover plate 407. A left spring 404 is fixedly installed on the left cover plate 407 and the left inner wall of the left end of the left sealing box 409. A left through hole 402 is provided on the left cover plate 407.A right sealing box 416 connected to the right end of the conveying pipe 401 is fixedly installed. A first right water outlet pipe 410 is fixedly installed on the inner wall of the conveying pipe 401. A second right water outlet pipe 411 connected to the first right water outlet pipe 410 is fixedly installed on the first right water outlet pipe 410. A right cover plate 414 that can block the first right water outlet pipe 410 for sealing is provided inside the right sealing box 416. A right sealing ring 415 that is fixedly sealed to the inner wall of the right sealing box 416 is fixedly installed on the outer side of the right cover plate 414. A right spring 413 is fixedly installed on the right cover plate 414 and the right end inner wall of the right sealing box 416. A right through hole 412 is provided on the right cover plate 414. The switching mechanism 5 includes a switching block 516 located below the pipe 1. The switching block 516 has a switching cavity 517 inside. The front end of the switching cavity 517 has a left return channel 505. The left end of the left return channel 505 has a left guide channel 504. A left connecting pipe 502 is fixedly installed on the outside of the left sealing box 409. The left end of the left sealing box 409 has a left drain hole 501 that communicates with the left connecting pipe 502. The bottom of the left connecting pipe 502 and the left end of the left guide channel 504 are sealed and fixedly connected to a left drain pipe 503. The switching chamber 517 has a right return channel 513 at its rear end, and a right guide channel 514 at the right end of the right return channel 513. A right connecting pipe 512 is fixedly installed on the outside of the right sealing box 416. A right drain hole 511 communicating with the right connecting pipe 512 is provided at the right end of the right sealing box 416. A right drain pipe 515 can be sealed and connected to the bottom of the right connecting pipe 512 and the right end of the right guide channel 514. A diversion conduit 509 is sealed and fixedly installed at the bottom of the delivery pipe 401. A diversion hole 510 communicating with the first right outlet pipe 410 is provided on the inner wall of the top of the diversion conduit 509. A diversion sleeve 520 is provided at the right end of the switching block 516. A diversion connecting pipe 508 can be sealed and connected between the diversion conduit 509 and the diversion sleeve 520. A diversion channel 506 is provided at the front end of the switching chamber 517. A diversion guide hole 507 communicating with the diversion channel 506 is provided at the left end of the diversion sleeve 520. A switching rod 518 is slidably connected to the switching block 516, with its front end passing through the right return channel 513 and reaching the inside of the switching cavity 517. A baffle 519 is fixedly installed at the front end of the switching rod 518, which can block the left return channel 505 or the right return channel 513.

[0018] In use, water is introduced through the inlet pipe 212. Under the pressure of the water flow, the pressure plate 210 is pushed open, and the water flows through the diverter 201 into the pipe 1. Then, the water flow pushes the anti-backflow plate 302 into the delivery connecting pipe 403, and then into the delivery pipe 401 through the delivery connecting pipe 403. At this time, the baffle 519 blocks the left return channel 505, so that the water flow can only press the right cover plate 414 to move and be discharged from the first right outlet pipe 410. When the right cover plate 414 moves, the right cover plate 414 presses the water between itself and the right end of the right sealing box 416 into the right connecting pipe 512 through the right drain hole 511, and then flows along the right diversion pipe 515, the right guide channel 514, the right return channel 513, the switching chamber 517, and the diverter. After passing through channel 506, diversion guide hole 507, diversion conduit 509, and diversion hole 510, the water is discharged from the first right outlet pipe 410. When it is necessary to switch the outlet position, the baffle 519 blocks the right return channel 513. At this time, the water flow pushes the left cover plate 407 to move and is discharged from the first left outlet pipe 408. When the left cover plate 407 moves, the water between the left cover plate 407 and the inner wall of the left end of the left sealing box 409 is pressed into the left connecting pipe 502 through the left drain hole 501. Then, it flows along the left diversion pipe 503, left guide channel 504, left return channel 505, switching chamber 517, diversion channel 506, diversion guide hole 507, diversion conduit 509, and diversion hole 510 and is discharged from the first right outlet pipe 410.

[0019] Although the present invention has been illustrated and described with reference to preferred embodiments, those skilled in the art will understand that various changes in form and detail are possible within the scope of the claims.

Claims

1. Anti-reflux switching valve comprising a duct (1), characterized in that: The front end of the pipe (1) is equipped with a water inlet mechanism (2), the rear end of the pipe (1) is equipped with an anti-backflow mechanism (3) to prevent the liquid in the pipe (1) from flowing back, the upper end of the pipe (1) is equipped with a water outlet mechanism (4), and the lower end of the pipe (1) is equipped with a switching mechanism (5) to adjust the water outlet position of the water outlet mechanism. The water outlet mechanism (4) includes a conveying pipe (401) fixedly connected to the top of the pipe (1). A conveying connecting pipe (403) communicating with the anti-backflow chamber (301) is fixedly installed on the conveying pipe (401). A left sealing box (409) communicating with the conveying pipe (401) is fixedly installed at the left end of the conveying pipe (401). A first left water outlet pipe (408) is fixedly installed on the inner wall of the conveying pipe (401). A connecting pipe (409) communicating with the first left water outlet pipe (409) is fixedly installed on the first left water outlet pipe (408). The second left water outlet pipe (406) of 08) is provided inside the left sealing box (409), which is connected to a left cover plate (407) that can block the first left water outlet pipe (408) for sealing. A left sealing rubber ring (405) is fixedly installed on the outside of the left cover plate (407) and fixedly sealed to the inside of the left sealing box (409). A left spring (404) is fixedly installed on the left cover plate (407) and the left end inner wall of the left sealing box (409). A left through hole (402) is provided on the left cover plate (407). The right end of the conveying pipe (401) is fixedly installed with a right sealing box (416) communicating with the conveying pipe (401). The inner wall of the conveying pipe (401) is fixedly installed with a first right water outlet pipe (410). The first right water outlet pipe (410) is fixedly installed with a second right water outlet pipe (411) communicating with the first right water outlet pipe (410). The inside of the right sealing box (416) is provided with a right cover plate (414) that can block the first right water outlet pipe (410) for sealing. The outside of the right cover plate (414) is fixedly installed with a right sealing ring (415) that is fixedly sealed to the inner wall of the right sealing box (416). The right cover plate (414) and the inner wall of the right end of the right sealing box (416) are fixedly installed with a right spring (413). The right cover plate (414) is provided with a right through hole (412). The switching mechanism (5) includes a switching block (516) located below the pipe (1). The switching block (516) has a switching cavity (517) inside. The front end of the switching cavity (517) has a left return channel (505). The left end of the left return channel (505) has a left guide channel (504). A left connecting pipe (502) is fixedly installed on the outside of the left sealing box (409). The left end of the left sealing box (409) has a left drain hole (501) that connects to the left connecting pipe (502). The bottom of the left connecting pipe (502) and the left end of the left guide channel (504) are sealed and fixedly connected to a left drain pipe (503). The switching chamber (517) is provided with a right return channel (513) at its rear end, and a right guide channel (514) is provided at the right end of the right return channel (513). A right connecting pipe (512) is fixedly installed on the outside of the right sealing box (416). A right drain hole (511) communicating with the right connecting pipe (512) is provided at the right end of the right sealing box (416). A right drain pipe (515) can be sealed and connected to the bottom of the right connecting pipe (512) and the right end of the right guide channel (514). The bottom of the delivery pipe (401) is sealed and fixedly installed with a diversion conduit (509). The top inner wall of the diversion conduit (509) is provided with a diversion hole (510) that connects to the first right outlet pipe (410). The right end of the switching block (516) is provided with a diversion sleeve (520). A diversion connecting pipe (508) can be sealed between the diversion conduit (509) and the diversion sleeve (520). The front end of the switching cavity (517) is provided with a diversion channel (506). The left end of the diversion sleeve (520) is provided with a diversion guide hole (507) that communicates with the diversion channel (506). The switching block (516) is slidably connected to a switching rod (518) whose front end passes through the right return channel (513) and reaches the inside of the switching cavity (517). The front end of the switching rod (518) is fixedly installed with a baffle (519) that can block the left return channel (505) or the right return channel (513).

2. The anti-reflux switching valve according to claim 1, characterized in that: The water inlet mechanism (2) includes a water inlet tank (203) integrally molded and fixedly installed at the front end of the pipe (1). A diversion cylinder (201) communicating with the pipe (1) is fixedly installed on the top of the inner wall of the water inlet tank (203). A water inlet conduit (212) communicating with the water inlet tank (203) is fixedly installed at the front end of the water inlet tank (203). A pressure plate (210) is provided inside the water inlet tank (203) to seal the bottom of the diversion cylinder (201). Lower sealing rings (202) are fixedly installed on both sides of the pressure plate (210). The outer side of the lower sealing rings (202) is sealed and fixedly connected to the inner wall of the water inlet tank (203). A lower pressure hole (211) is provided on the pressure plate (210). The pressure plate (210) is fixedly installed with a lower spring (204) on the bottom inner wall of the water inlet tank (203); the water inlet tank (203) is provided with a sealing cavity (207) that connects to the outside world, the water inlet tank (203) is provided with a first guide channel (205) that connects the sealing cavity (207) and the bottom inner wall of the water inlet tank (203), the water inlet tank (203) is provided with a countersunk cavity (206) that connects to the sealing cavity (207), the inner wall of the countersunk cavity (206) is provided with a second guide channel (209) that connects to the inside of the pipe (1), and the inner wall of the sealing cavity (207) is slidably sealed with a plug (208) that can block the countersunk cavity (206) so that it does not connect with the sealing cavity (207).

3. The anti-reflux switching valve of claim 1, wherein: The anti-backflow mechanism (3) includes an anti-backflow cavity (301), a frame (303) is slidably connected to the inner wall of the pipe (1), an anti-backflow plate (302) that can block the other end of the pipe (1) is fixedly installed on the frame (303), a negative pressure balance hole (307) that connects to the outside is provided on the anti-backflow cavity (301), a support plate (304) is provided on the inner wall of the anti-backflow cavity (301), a guide rod (305) corresponding to the negative pressure balance hole (307) is fixedly installed on the support plate (304), and a blocking ball (306) that can block the negative pressure balance hole (307) is slidably between the guide rods (305).

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