Water-saving solenoid valves, automatic drain antifreeze pipes, and automatic drain antifreeze toilets

Abstract

This invention provides a water-saving solenoid valve, an automatic draining antifreeze pipe, and an automatic draining antifreeze toilet. The water-saving solenoid valve includes a valve body, a cylinder, a piston, a coil, and a diverter port. The valve body has an inlet and an outlet. The cylinder is fixedly mounted on the valve body. The piston is at least partially disposed within a receiving cavity, and an elastic element with a preset elastic force is provided between the other end of the piston and the valve nut. The coil is disposed on the outer periphery of the cylinder and at least partially overlaps with the piston. The diverter port is disposed on the valve body and communicates with the water flow channel, and is located downstream of the position where the piston closes the water flow channel along the water flow direction; the diameter of the diverter port is smaller than the diameter of the outlet. The water-saving solenoid valve provided by this invention can avoid the problem of delayed discharge of residual water after power failure in traditional solenoid valves, significantly reducing water waste caused by ineffective drainage, and can also completely eliminate water pressure crosstalk and water flow interference between multiple branches.

Description

Technical Field

[0001] This invention belongs to the field of valve technology, specifically, it relates to a water-saving solenoid valve, an automatic draining antifreeze pipe, and an automatic draining antifreeze toilet. Background Technology

[0002] In the low temperatures of winter in northern my country, residual water in the water supply pipes of rural public toilets is prone to freezing and cracking, leading to the closure and shutdown of public toilets during winter – a long-standing and prominent problem in rural toilet renovation. Existing technologies employ an independent branch solenoid valve for each squatting toilet and an electrically controlled delayed drainage system for freeze protection. However, during implementation, the applicant discovered that while multiple squatting toilets share a single water pump, and each branch is equipped with an independent solenoid valve, the system relies on a controller to set a delay time to open and drain the water after flushing. In actual use, pedestrians randomly trigger the sensor-activated flushing. If the flushing interval between the two branch lines is extremely short: the first branch line finishes flushing and enters the delayed emptying countdown, with water in the pipes being discharged; at this time, the second branch line triggers flushing, the water pump starts outputting water pressure, and cross-flow occurs between the pipes, causing high-pressure water to flow back into the first pipe that is being emptied; when the delay timer of the first branch line ends and the solenoid valve automatically locks, the water that has been re-entered into the pipe cannot be discharged, leaving water in the pipes. In winter, low temperatures can still cause freezing and blockage, rendering the anti-freeze function ineffective. Existing delayed electronically controlled emptying solutions rely on sequential logic control, which cannot avoid the problem of cross-flow of water pressure in multiple branch lines. Extending the delay time would significantly increase water and electricity consumption; adding an anti-cross-flow check valve would multiply the number of valve wells and pipe fittings, complicating construction, increasing the failure rate, and significantly raising the overall equipment cost. Summary of the Invention

[0003] The purpose of this invention is to provide a water-saving solenoid valve, an automatic draining antifreeze pipe, and an automatic draining antifreeze toilet, aiming to solve the problem that public toilets cannot be used normally in winter in the prior art.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is: to provide a water-saving solenoid valve, comprising: The valve body has an inlet and an outlet, and the valve body is also provided with a water flow channel connecting the inlet and the outlet; A cylinder body is fixedly mounted on the valve body. The cylinder body has an internal cavity. One end of the cylinder body is open, and the other end is connected to the water flow channel. A valve nut for sealing is provided at the open end of the cylinder body. A piston, at least partially disposed within the receiving cavity and slidably connected to the cylinder, is provided at one end of the piston near the valve body to close the water flow channel; an elastic element with a preset elastic force is provided between the other end of the piston and the valve nut. A coil is disposed on the outer periphery of the cylinder and at least overlaps with the piston; the coil can be used to generate electromagnetic force to drive the piston to slide within the cylinder. A diversion port is provided on the valve body and communicates with the water flow channel. The diversion port is located downstream of the position where the piston closes the water flow channel along the water flow direction. The diameter of the diversion port is smaller than the diameter of the outlet. When the coil is energized, the coil generates electromagnetic force to push the piston to move closer to the valve nut and compress the elastic element, opening the water flow channel inside the cylinder; when the coil is not energized, the piston closes the water flow channel under the elastic force of the elastic element, cutting off the water flow between the inlet and outlet of the valve body, and the water on the outlet side is discharged under the action of the diversion port.

[0005] Optionally, the diversion port is provided with a diversion pipe, which is used to connect a water pipe or an air inlet pipe.

[0006] Optionally, the end of the diversion pipe is provided with a one-way sealing mechanism; the one-way sealing mechanism is used to close the diversion pipe when the water flow channel of the valve body is open, and to open the diversion pipe when the water flow channel is closed.

[0007] Optionally, the one-way sealing mechanism includes: A cap is provided for installation at the end of the shunt pipe; the cap is provided with a guide hole. A drain guide rod passes through the cover and is slidably connected to the cover through the guide hole. A drain plug is fixedly provided at one end of the drain guide rod near the diversion pipe. The drain plug is used to seal with one end of the cover. A drain groove is provided along the axial direction of the drain guide rod. The drain groove and a portion of the guide hole form a drain outlet. A limiting structure is provided at the end of the drain guide rod away from the diversion pipe. A return spring is disposed between the cover and the drain plug, and the return spring is fitted onto the drain guide rod; In the initial position, the return spring is in a free or pre-compressed state, the drain plug and the cover have a preset distance, the limiting structure on the drain guide rod abuts against the side of the cover away from the diversion pipe, and the drain outlet connects the diversion pipe and the outside of the cover; when the drain plug is impacted by water flow, the return spring is compressed, the drain plug and the cover seal against each other, sealing the diversion pipe.

[0008] Optionally, the one-way sealing mechanism includes: A branch pipe is installed on the branch pipe and is connected to the branch pipe; A guide rod is provided, which passes through the valve body. One end of the guide rod is fixedly connected to the piston, and the guide rod is at least located inside the valve body and is parallel to the axis of the piston. The flow divider plug is fixedly connected to the other end of the guide rod located outside the valve body; The flow divider plug is located inside the flow divider tube and is slidably connected to the flow divider tube; when the piston is in the open state, the flow divider plug is used to close the outlet of the branch tube; when the piston is in the closed state, the flow divider tube is connected to the branch tube.

[0009] Optionally, a sealing ring is provided between the guide rod and the valve body, and the sealing ring is fixed to the valve body.

[0010] Optionally, a connecting rod is fixedly provided on the guide rod, and the flow divider is connected to the connecting rod.

[0011] Optionally, the solenoid valve is further provided with at least a protective cover for protecting the guide rod.

[0012] The beneficial effects of the water-saving solenoid valve provided by this invention are as follows: This invention discloses a water-saving solenoid valve, the core of which adopts a purely mechanical reset sealing structure: when the coil is de-energized, the pre-compressed reset elastic element will directly drive the piston to move rapidly along the axial direction, immediately sealing the main flow channel of the inlet, so that each independent water branch immediately forms a physical hard isolation with the upstream water supply main line after the flushing process is completed. This structure can avoid the problem of delayed discharge of residual water after the power is cut off in traditional solenoid valves, greatly reducing the waste of water resources caused by ineffective drainage; at the same time, each branch is isolated from the main line through an independent sealing piston, completely eliminating water pressure crosstalk and water flow interference between multiple branches. After the inlet is sealed by the piston, the water remaining in the valve cavity on the outlet side can be automatically discharged through the pre-set diversion drain port at the low position of the valve cavity, realizing the complete emptying of residual water in the valve, avoiding the freezing and swelling damage to the valve body in low temperature environments, so that this solenoid valve can be widely used in various scenarios that require evacuation and antifreeze, such as outdoor bathrooms, agricultural irrigation, and outdoor water supply pipelines.

[0013] The present invention also provides an automatic draining antifreeze pipe, comprising any one of the above-mentioned water-saving solenoid valves.

[0014] The present invention also provides an automatic draining antifreeze toilet, comprising any of the above-mentioned water-saving solenoid valves.

[0015] The beneficial effects of the automatic emptying antifreeze toilet provided by this invention are as follows: By adopting a purely mechanical reset structure in which the inlet is immediately sealed by an elastic element pushing the piston when the coil is de-energized, each branch is physically isolated from the main water supply line immediately after flushing. This fundamentally eliminates the hidden danger of high-pressure water backflow and secondary water accumulation caused by adjacent branch flushing in scenarios with multiple squatting toilets sharing a pump. At the same time, it abandons the time-dependent logic of traditional electronic control delay schemes, eliminating the problem of asynchronous locking and drainage caused by delay timing errors. With the addition of a diversion port with a diameter smaller than the outlet, residual water is slowly and steadily discharged after closing. This reduces water waste during delay and avoids impact damage to the pipeline from instantaneous pressure relief to a certain extent. It ensures that there is no water accumulation in the pipeline on the outlet side, and each branch operates completely independently. To a certain extent, it solves the long-standing pain point of easy failure of antifreeze function in rural public toilets under random flushing scenarios. It is particularly suitable for the winter antifreeze renovation and promotion of decentralized public toilets in northern rural areas. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of the water-saving solenoid valve provided in Embodiment 1 of the present invention; Figure 2 This is a schematic diagram of the structure of the water-saving solenoid valve provided in Embodiment 2 of the present invention; Figure 3 for Figure 1 Enlarged view of point A in the middle; Figure 4 This is a schematic diagram of a drainage guide rod used in Embodiment 2 of the present invention; Figure 5 This is a schematic diagram of the closed state of the water-saving solenoid valve provided in Embodiment 3 of the present invention; Figure 6 This is a schematic diagram of the water-saving solenoid valve in the open state provided in Embodiment 3 of the present invention; Figure 7 This is a schematic diagram of the structure of the water-saving solenoid valve provided in Embodiment 4 of the present invention.

[0018] In the picture: 1. Valve body; 2. Cylinder; 3. Piston; 4. Valve spring; 5. Coil; 6. Valve nut; 7. Diverter pipe; 8. Cover; 9. Drain plug; 10. Drain guide rod; 101. Drain groove; 102. Thread; 11. Return spring; 12. Limit nut; 13. Guide rod; 14. Connecting rod; 15. Diverter plug. Detailed Implementation

[0019] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0020] Please refer to the following: Figures 1-6 The water-saving solenoid valve provided by this invention will now be described. The water-saving solenoid valve includes: a valve body 1, a cylinder 2, a piston 3, a coil 5, and a flow divider. The valve body 1 has an inlet and an outlet, and a water flow channel connecting the inlet and outlet is also provided inside the valve body 1. The cylinder 2 is fixedly mounted on the valve body 1, and has an internal receiving cavity. One end of the cylinder 2 is open, and the other end is connected to the water flow channel; a valve nut 6 for sealing is provided at the open end of the cylinder 2.

[0021] Piston 3 is at least partially disposed within the receiving cavity and is slidably connected to cylinder 2. One end of piston 3 near valve body 1 is used to close the water flow channel. The other end of piston 3 is provided with an elastic element with a preset elastic force between it and valve nut 6. The elastic element can be valve spring 4 or other available devices that can provide elasticity. Coil 5 is disposed on the outer periphery of cylinder 2 and at least partially overlaps with piston 3. Coil 5 can be used to generate electromagnetic force to drive piston 3 to slide within cylinder 2. Diverter port is disposed on valve body 1 and communicates with the water flow channel. Diverter port is located downstream of the position where piston 3 closes the water flow channel along the water flow direction. The diameter of diverter port is smaller than the diameter of outlet port.

[0022] When coil 5 is energized, the coil 5 generates electromagnetic force to push piston 3 to move closer to valve nut 6 and compress the elastic element, opening the water flow channel in cylinder 2; when coil 5 is not energized, piston 3 closes the water flow channel under the elastic force of the elastic element, cutting off the water flow between the inlet and outlet of valve body 1, and the water on the outlet side is discharged under the action of the diversion port.

[0023] The beneficial effects of the water-saving solenoid valve provided by this invention are as follows: Compared with the prior art, by adopting a purely mechanical reset structure in which the piston 3 is pushed by the elastic element to immediately close the water inlet when the coil 5 is de-energized, each branch is immediately physically isolated from the main water supply line after flushing, and the water stored on the outlet side is discharged under the action of the diversion port, reducing the amount of wasteful drainage and saving water to a certain extent. On the other hand, the branches will not interfere with each other, and one modification achieves multiple functions, which can be used in various scenarios that require drainage and antifreeze.

[0024] As a specific embodiment of the water-saving solenoid valve provided by the present invention, please refer to Figure 1 The diversion port is equipped with a diversion pipe for connecting to a water distribution pipe or an air inlet pipe. The diversion port can be used independently or connected to a diversion pipe. When the diversion port is used independently, the water-saving solenoid valve can be installed inside the water storage device at the lower end of the water circuit. When external water supply is required, piston 3 is opened, and water is supplied to the outside through the water flow channel under the action of an additional power device (such as a water pump). When water is not needed, piston 3 closes the water flow channel, and the water downstream of the water-saving solenoid valve will flow back to the water storage device from the diversion port. When the water-saving solenoid valve is used outside the water storage device, it can be connected to the inside of the water storage device or the water-using end through the diversion pipe, and the water will also flow back to the inside of the water storage device or flow to the water-using end. When the water-saving solenoid valve is located at the higher end of the water circuit, air will enter through the diversion port or diversion pipe, causing the water in the water circuit to drain to the lower end, achieving the effect of emptying the water pipe.

[0025] As a specific embodiment of the water-saving solenoid valve provided by the present invention, please refer to Figures 2-6 The end of the diversion pipe is equipped with a one-way sealing mechanism; the one-way sealing mechanism is used to close the diversion pipe when the water flow channel of valve body 1 is open, and to open the diversion pipe when the water flow channel is closed. The one-way sealing device prevents the diversion pipe from draining excess water, thus saving more water than the aforementioned solution.

[0026] As a specific embodiment of the water-saving solenoid valve provided by the present invention, please refer to Figure 2 and Figure 3 The one-way sealing mechanism includes a cover 8, a drain guide rod 10, and a return spring 11. The cover 8 is installed at the end of the diversion pipe; a guide hole is provided on the cover 8. The drain guide rod 10 passes through the cover 8 and is slidably connected to the cover 8 through the guide hole. A drain plug 9 is fixedly provided at the end of the drain guide rod 10 near the diversion pipe, and the drain plug 9 is used for sealing cooperation with one end of the cover 8. A drain groove 101 is provided along the axial direction of the drain guide rod 10, and the drain groove 101 and a portion of the guide hole form a drain outlet. A limiting structure is provided at the end of the drain guide rod 10 away from the diversion pipe. The return spring 11 is disposed between the cover 8 and the drain plug 9, and the return spring 11 is fitted onto the drain guide rod 10.

[0027] In the initial position, the return spring 11 is in a free or pre-compressed state, the drain plug 9 and the cover 8 have a preset distance, the limiting structure on the drain guide rod 10 abuts against the side of the cover 8 away from the diversion pipe, and the drain outlet connects the diversion pipe and the outside of the cover 8; when the drain plug 9 is impacted by water flow, the return spring 11 is compressed, the drain plug 9 and the cover 8 seal against each other, and the diversion pipe is sealed.

[0028] With the above structure, when water flows through the water-saving solenoid valve, the water pressure pushes the drain plug 9 against the pressure of the return spring 11, causing the drain plug 9 to press tightly against the cover 8, achieving a water-blocking and sealing effect. When the water-saving solenoid valve is closed, due to the decrease in water pressure, the drain plug 9 moves under the action of the return spring 11, creating a gap between the drain plug 9 and the cover 8. This gap is precisely where the drain guide rod 10 has a drain groove 101, allowing water to drain or vent through the drain port, allowing the water in the pipe to automatically drain under gravity. This allows for a larger diameter of the diversion pipe 7, increasing the speed of pipe emptying and reducing the risk of impurities in the water clogging the diversion pipe 7. Optionally, a rust-resistant spring can be selected.

[0029] In the specific implementation process, please refer to Figure 4 The drain guide rod 10 can be cross-shaped, with its circumference being an arc surface located on the same cylindrical surface, to slide and engage with the guide hole on the cover 8. The limiting structure can be a limiting nut 12, with external threads 102 on the drain guide rod 10 for threaded connection with the limiting nut 12. This facilitates installation and manufacturing.

[0030] As a specific embodiment of the water-saving solenoid valve provided by the present invention, please refer to Figure 5 and Figure 6 The one-way sealing mechanism includes a branch pipe, a guide rod 13, and a flow divider plug 15. The branch pipe is disposed on and communicates with the flow divider pipe 7. The guide rod 13 passes through the valve body 1, and one end of the guide rod 13 is fixedly connected to the piston 3. The portion of the guide rod 13 located inside the valve body 1 is parallel to the axis of the piston 3. The flow divider plug 15 is fixedly connected to the other end of the guide rod 13 located outside the valve body 1. The flow divider plug 15 is located inside the flow divider pipe 7 and is slidably connected to the flow divider pipe 7. When the piston 3 is in the open state, the flow divider plug 15 is used to close the outlet of the branch pipe. When the piston 3 is in the closed state, the flow divider pipe 7 communicates with the branch pipe.

[0031] In the above embodiment, the guide rod 13 is used to connect the piston 3 and the diverter plug 15, thus enabling the diverter plug 15 and the piston 3 to work together. When the piston 3 opens the water flow channel of the valve body 1, the diverter plug 15 closes the diversion pipe 7, avoiding unnecessary water waste and saving water to a certain extent. The branch pipe is provided to allow the diverter plug 15 to slide at the end of the diversion pipe 7, resulting in better structural performance. At this time, the diversion pipe 7 and the branch pipe form a three-way connection. If the guide rod 13 and the diverter plug 15 have good rigidity, the diverter plug 15 can also be directly used to close and open the diversion pipe 7.

[0032] Optionally, a sealing ring (not shown in the figure) is provided between the guide rod 13 and the valve body 1, and the sealing ring is fixed to the valve body 1. This can reduce dry friction, improve the sealing effect, and prevent water leakage.

[0033] In the implementation of the above-described structure, the guide rod 13 can be a straight rod in one section and a curved rod in the other section for connecting the flow divider plug 15. However, for better assembly and manufacturing, please refer to [the relevant documentation]. Figures 5-7 A connecting rod 14 is fixedly mounted on the guide rod 13, and a flow divider 15 is connected to the connecting rod 14. This modular design facilitates assembly and manufacturing.

[0034] As a specific embodiment of the water-saving solenoid valve provided by the present invention, please refer to Figure 7 The water-saving solenoid valve is also equipped with a protective cover for at least the guide rod 13. The protective cover protects the moving parts from damage caused by collisions during transportation or use.

[0035] As a specific embodiment of the water-saving solenoid valve provided by the present invention, the diversion pipe 7 is integrally formed with the valve body 1, resulting in better structural performance.

[0036] This invention also provides an automatic drainage antifreeze pipeline, including any of the above-mentioned water-saving solenoid valves. Specifically, the automatic drainage antifreeze pipeline includes the aforementioned water-saving solenoid valve and inlet / outlet water pipes connected to the valve body 1. Using this water-saving solenoid valve, when the valve is closed, the water in the pipe connected to the outlet side can be drained, achieving an antifreeze effect. This water-saving solenoid valve can be used in scenarios requiring antifreeze protection. Of course, this automatic drainage antifreeze pipeline is not necessarily limited to draining water or water pipes; it can also be other liquid pipes susceptible to freezing damage at low or high temperatures.

[0037] This invention also provides an automatic draining and antifreeze toilet, including any of the above-mentioned water-saving solenoid valves. When this water-saving solenoid valve is applied to the field of toilet technology, it can be used for toilet renovation.

[0038] The valve body 1 is equipped with a diversion port, and two drainage structures can be selected according to the toilet water supply conditions: Operating Condition 1: An underground water storage tank is installed below the valve well. The water-saving solenoid valve is mounted above the water surface in the tank. The bottom of the valve body 1 has only a through-hole for diverting water. The drained water drips directly into the water storage tank below through the diverting hole for recycling, without the need for an external diverting pipe. Of course, if a one-way sealing mechanism is configured, the diverting pipe 7 can be completely sealed during flushing, resulting in even better water-saving performance.

[0039] Scenario 2: The public toilet lacks an underground water storage tank. It is equipped with a booster pump and a pressurized water tank for pressurized water supply. An integrally molded, downward-extending branch pipe 7 is installed on valve body 1. Branch pipe 7 connects to the bottom of the main water flow channel inside valve body 1 of the water-saving solenoid valve. The end of the thinner pipe leads to a septic tank, an underground seepage well, or the water user. The diameter of branch pipe 7 is smaller than the main water flow channel, resulting in only a small amount of water leakage during flushing, which does not affect the flushing pressure of the squat toilet. Of course, if a one-way sealing mechanism is configured, branch pipe 7 can be completely sealed during flushing, resulting in even better water-saving performance.

[0040] Work isolation logic: Each squatting toilet branch is independently equipped with its own water-saving solenoid valve, and the valve bodies 1 of each branch are independent of each other, and the drainage paths are not connected to each other; after flushing is completed and the piston 3 closes the water circuit, the residual water in the water supply pipe can only rely on gravity to collect unidirectionally along the inclined pipe to the low-level valve body 1, and can only be discharged outward through its own matching drainage structure; the water pressure generated by flushing in other branches cannot be reversed into the pipes of the main water circuit that have been closed, completely eliminating cross-flow and secondary water ingress.

[0041] This invention features a multi-branch alternating flushing anti-crossflow mechanism: if other squatting toilet branches trigger flushing simultaneously or at short intervals, the corresponding branch's water-saving solenoid valve opens individually, and its water supply pressure is completely blocked by the piston 3 of the closed branch, preventing backflow into other closed branch pipes through the main waterway; the preceding branch continuously drains the accumulated water by its own slope and gravity, and there is no situation where high-pressure water re-enters the pipes, so the accumulated water in the pipes can be drained completely, thus completely eliminating the crossflow and freezing defects of the original delayed drainage scheme.

[0042] This invention also simplifies the electrical control system and reduces the probability of failure: It eliminates the complex delayed emptying control module, retaining only the basic sensor-activated flushing solenoid valve control circuit, resulting in a simple and stable control system suitable for harsh rural environments. Fully automatic passive emptying with no continuous energy consumption: It eliminates the need for energy-consuming anti-freeze components such as pipe insulation and electric heat tracing, relying solely on gravity for emptying, ensuring no additional electricity costs for long-term operation of the public toilet. Highly versatile and adaptable to both new and old public toilet renovations: It can directly replace ordinary solenoid valves and existing delayed emptying solenoid valves in old public toilets, and can be used as a complete set in newly built anti-freeze demonstration public toilets. The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A water-saving solenoid valve, characterized in that, include: The valve body has an inlet and an outlet, and the valve body is also provided with a water flow channel connecting the inlet and the outlet; A cylinder body is fixedly mounted on the valve body. The cylinder body has an internal cavity. One end of the cylinder body is open, and the other end is connected to the water flow channel. A valve nut for sealing is provided at the open end of the cylinder body. A piston, at least partially disposed within the receiving cavity and slidably connected to the cylinder, is provided at one end of the piston near the valve body to close the water flow channel; an elastic element with a preset elastic force is provided between the other end of the piston and the valve nut. A coil is disposed on the outer periphery of the cylinder and at least overlaps with the piston; the coil can be used to generate electromagnetic force to drive the piston to slide within the cylinder. A diversion port is provided on the valve body and communicates with the water flow channel. The diversion port is located downstream of the position where the piston closes the water flow channel along the water flow direction. The diameter of the diversion port is smaller than the diameter of the outlet. When the coil is energized, the coil generates electromagnetic force to push the piston to move closer to the valve nut and compress the elastic element, opening the water flow channel inside the cylinder; when the coil is not energized, the piston closes the water flow channel under the elastic force of the elastic element, cutting off the water flow between the inlet and outlet of the valve body, and the water on the outlet side is discharged under the action of the diversion port.

2. The water-saving solenoid valve as described in claim 1, characterized in that, The diversion port is equipped with a diversion pipe, which is used to connect to a water pipe or an air inlet pipe.

3. The water-saving solenoid valve as described in claim 2, characterized in that, The end of the diversion pipe is provided with a one-way sealing mechanism; the one-way sealing mechanism is used to close the diversion pipe when the water flow channel of the valve body is open, and to open the diversion pipe when the water flow channel is closed.

4. The water-saving solenoid valve as described in claim 3, characterized in that, The one-way sealing mechanism includes: A cap is provided for installation at the end of the shunt pipe; the cap is provided with a guide hole. A drain guide rod passes through the cover and is slidably connected to the cover through the guide hole. A drain plug is fixedly provided at one end of the drain guide rod near the diversion pipe. The drain plug is used to seal with one end of the cover. A drain groove is provided along the axial direction of the drain guide rod. The drain groove and a portion of the guide hole form a drain outlet. A limiting structure is provided at the end of the drain guide rod away from the diversion pipe. A return spring is disposed between the cover and the drain plug, and the return spring is fitted onto the drain guide rod; In the initial position, the return spring is in a free or pre-compressed state, the drain plug and the cover have a preset distance, the limiting structure on the drain guide rod abuts against the side of the cover away from the diversion pipe, and the drain outlet connects the diversion pipe and the outside of the cover; when the drain plug is impacted by water flow, the return spring is compressed, the drain plug and the cover seal against each other, sealing the diversion pipe.

5. The water-saving solenoid valve as described in claim 3, characterized in that, The one-way sealing mechanism includes: A branch pipe is installed on the branch pipe and is connected to the branch pipe; A guide rod is provided, which passes through the valve body. One end of the guide rod is fixedly connected to the piston, and the guide rod is at least located inside the valve body and is parallel to the axis of the piston. The flow divider plug is fixedly connected to the other end of the guide rod located outside the valve body; The flow divider plug is located inside the flow divider tube and is slidably connected to the flow divider tube; when the piston is in the open state, the flow divider plug is used to close the outlet of the branch tube; when the piston is in the closed state, the flow divider tube is connected to the branch tube.

6. The water-saving solenoid valve as described in claim 5, characterized in that, A sealing ring is provided between the guide rod and the valve body, and the sealing ring is fixed to the valve body.

7. The water-saving solenoid valve as described in claim 5, characterized in that, A connecting rod is fixedly mounted on the guide rod, and the flow divider is connected to the connecting rod.

8. The water-saving solenoid valve as described in any one of claims 5-7, characterized in that, The solenoid valve is also provided with at least a protective cover for protecting the guide rod.

9. An automatic drainage and antifreeze pipe, characterized in that, Including the water-saving solenoid valve as described in any one of claims 1-8.

10. An automatic emptying and frost-proof toilet, characterized in that, Including the water-saving solenoid valve as described in any one of claims 1-8.

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