Automatic emptying and antifreeze system for water supply pipes in public toilets

Abstract

The present invention provides an automatic emptying and antifreezing system for a water supply pipe in a public toilet, which belongs to the technical field of toilet antifreezing. The automatic emptying and antifreezing system for a water supply pipe in a public toilet comprises: a water storage unit, an insulation valve box, a water pipe, a water outlet pipe, a driving unit, and a control unit. When the water-using device in the public toilet needs water, the control unit controls the driving unit to start and the electromagnetic water valve corresponding to the water outlet pipe is opened; the water in the water storage unit is transported to the water-using device through the water pipe and the water outlet pipe. When the water is used, the electromagnetic water valve is closed, the self-return valve is automatically opened, the water in the water pipe flows back to the water storage unit, and the water in the water outlet pipe is discharged to the water-using device. At the same time, the insulation valve box wraps the electromagnetic water valve and the self-return valve inside, which has the effect of heat preservation and antifreezing, and will not directly allow the low-temperature gas from the outside to enter the water pipe and the water outlet pipe, so that the residual water in the pipe freezes. This double protection measure avoids the problem that the water pipe and the water outlet pipe are frozen and blocked and the toilet cannot be used.

Description

Technical Field

[0001] The invention belongs to the technical field of toilet antifreeze, and in particular relates to an automatic emptying antifreeze system for a water supply pipeline in a public toilet. Background Art

[0002] In the northern part of my country, ordinary residential houses have heating equipment in winter, but most rural public toilets do not have heating equipment. In public toilets, water pipes and pipe fittings are frozen and blocked, making the toilets unable to be used normally, bringing inconvenience to people's lives. To solve this problem, existing technologies have introduced technical solutions such as pipe insulation and adding heating belts, but none of them solve this problem well; for example, the local insulation of pipe insulation falls off, the bends of pipes, the joints of pipe fittings, serpentine pipes (network pipes), etc., often cause the problem of water pipes and pipe fittings freezing and blocking due to poor wrapping, and in the solution of adding electric heating belts to the outside of the water pipes, there is no detection of whether the water pipes need anti-freezing and heating. Long-term power consumption also consumes a lot of electricity. In addition, if the insulation is not well laid, it will freeze even if there are electric heating belts.

[0003] In addition, a considerable number of villages cannot provide water throughout the day and the water supply is unstable. For example, the water supply points in some villages generally supply water from 6 am to 10 pm, while at other times or when the water supply equipment fails, people who go to the toilet have no water available, and they cannot flush the toilet after use, which greatly increases the difficulty of using public toilets.

[0004] In order to solve the freezing of water pipes, a utility patent has been applied for with the patent number: ZL202420279653.7, and the patent application date: February 5, 2024. In the process of implementing the patent, the applicant found that the valve well is located underground, and valves and other components are relatively prone to failure in a humid environment and are not easy to maintain and repair. Therefore, a new way is sought to solve the problem of antifreeze of toilet water supply pipes. Summary of the invention

[0005] The purpose of the present invention is to provide an automatic emptying and antifreezing system for water supply pipes in public toilets, aiming to solve the problem in the prior art that public toilets cannot be used normally in winter.

[0006] To achieve the above purpose, the technical solution adopted by the present invention is to provide an automatic emptying and antifreezing system for water supply pipes in public toilets, comprising: A water storage unit, used for storing water for public toilets, wherein the water storage unit is arranged below the frozen soil layer on the ground; The insulated valve box is installed in the toilet; A water pipe, the first end of which is used to connect to the water storage unit, and the second end of which extends to the inside of the thermal insulation valve box. A self-return valve is provided at the highest point of the second end of the water pipe in the horizontal direction; the self-return valve is located in the thermal insulation valve box; A water outlet pipe, the number of which is at least one; one end of the water outlet pipe is connected to a water-using device, and the other end is connected to the second end of the water delivery pipe, and the end of the water outlet pipe connected to the water-using device is lower than the other end connected to the water delivery pipe; a self-return valve is provided at the highest point of the water outlet pipe in the horizontal direction; and a solenoid water valve is also provided on the water outlet pipe; A driving unit, used for providing power to transport the water in the water storage unit to water-using appliances in the public toilet through the water delivery pipe and the water outlet pipe; and A control unit, electrically connected to the driving unit and the electromagnetic water valve respectively; When the water-using appliances in the public toilet need water, the control unit controls the driving unit to start and the electromagnetic water valve of the corresponding water outlet pipe to open; the water in the water storage unit is transported to the water-using appliances through the water supply pipe and the water outlet pipe; when the water is finished, the electromagnetic water valve is closed, and the return air valve is automatically opened, the water in the water supply pipe flows back to the water storage unit, and the water in the water outlet pipe is discharged to the water-using appliances.

[0007] Furthermore, when the number of the water outlet pipes is more than two, a connecting pipe is provided in the thermal insulation valve box, and the water supply pipe is connected with the water outlet pipe through the connecting pipe.

[0008] Furthermore, along the water flow direction of the water outlet pipe, the electromagnetic water valve located on the water outlet pipe is located in front of the self-return air valve.

[0009] Furthermore, it also includes a water pipe for conveying water to the water storage unit, and the water pipe is provided with a water full stop valve.

[0010] Furthermore, the tap water pipe is also provided with a tap water branch pipe connected to the water-using appliance, and the tap water branch pipe is provided with an electromagnetic water valve; along the water flow direction of the tap water branch pipe, the tap water branch pipe is also provided with a diversion pipe on the rear side of the electromagnetic water valve, and the water flow of the diversion pipe is smaller than the water flow of the tap water branch pipe; the tap water branch pipe is also provided with thermal insulation cotton for wrapping the electromagnetic water valve and the connection between the tap water branch pipe and the diversion pipe, and the diversion pipe extends to the outside of the thermal insulation cotton.

[0011] Furthermore, a heating element is provided in the thermal insulation cotton near the tap water branch pipe.

[0012] Furthermore, the driving unit comprises: A pressure water storage tank is arranged in the water storage unit, and the first end of the water delivery pipe extends to the bottom of the pressure water storage tank; a one-way water valve for water inlet is also arranged at the lower end of the pressure water storage tank; An air delivery pipe, the first end of which is connected to the upper part of the pressure water storage tank, and the second end of which extends to the outside of the water storage unit; An air pump is connected to the second end of the air delivery pipe and is used to deliver gas to the interior of the pressure water storage tank.

[0013] Furthermore, it also includes a water pipe for delivering water to the water storage unit, and the water pipe is provided with a water full stop valve; The tap water pipe is also provided with a tap water branch pipe connected to the water-using appliance connected to the air pump; the air pump is also provided with a branch air pipe, the branch air pipe is connected to the end of the tap water branch pipe, and a branch air valve is provided on the branch air pipe; the tap water branch pipe is also provided with a water distribution pipeline connected to the water-using appliance, and an induction water valve is provided on the water distribution pipeline; When using water-using appliances, the corresponding induction water valve opens and water flows out. When the induction water valve is closed with a delay, the branch air valve in the branch air pipeline opens first, and the gas in the branch air pipeline discharges the water in the water distribution pipeline. The induction water valve is closed again to complete the process. Then, the gas in the branch air pipeline presses the water in the tap water branch pipe into the underground horizontal tap water pipe at the same time. Then, the branch air valve is closed to make the tap water branch pipe an empty pipe. When the water-using appliance is used again, the corresponding induction water valve opens the water distribution pipeline to discharge the gas first and then the water.

[0014] Furthermore, a heating element is also provided in the thermal insulation valve box.

[0015] Furthermore, the water storage unit is a water tank or a water pool.

[0016] The beneficial effect of the automatic emptying and antifreezing system for the water supply pipeline of the public toilet provided by the present invention is that: compared with the prior art, by arranging the self-returning valve at the highest point of the horizontal direction of the water delivery pipe and the water outlet pipe, when the water-using appliance in the public toilet needs water, the control unit controls the driving unit to start and the electromagnetic water valve corresponding to the water outlet pipe is opened; the water in the water storage unit is transported to the water-using appliance through the water delivery pipe and the water outlet pipe; when the water is used, the electromagnetic water valve is closed, and since the inside of the water delivery pipe and the water outlet pipe are both in a negative pressure state, the self-returning valve is automatically opened, the water in the water delivery pipe is returned to the water storage unit, and the water in the water outlet pipe is discharged to the water-using appliance, and the water delivery pipe and the water outlet pipe are both in an empty pipe antifreezing state. At the same time, the insulation valve box wraps the electromagnetic water valve and the self-returning valve inside, which has the effect of heat preservation and antifreezing, and will not directly allow the low-temperature gas from the outside to enter the water delivery pipe and the water outlet pipe, so that the residual water in the pipe freezes. This double protection measure avoids the problem that the water delivery pipe and the water outlet pipe are frozen and blocked, and the toilet cannot be used, and has low cost and high reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 A schematic diagram of the structure of an automatic emptying and antifreezing system for water supply pipes in a public toilet provided in Example 1 of the present invention; Figure 2 A schematic diagram of the structure of an automatic emptying and antifreezing system for a public toilet water supply pipe provided in Example 2 of the present invention; Figure 3 A schematic diagram of the structure of an automatic emptying and antifreezing system for a public toilet water supply pipe provided in Example 3 of the present invention; Figure 4 A schematic structural diagram of the automatic emptying and antifreezing system for the public toilet water supply pipe provided in Example 4 of the present invention.

[0019] In the figure: 1. Water storage unit; 2. Insulation cover; 3. Water pump; 4. Water pipe; 41. Water branch pipe; 5. Water full stop valve; 6. Water pipe; 7. Connecting pipe; 8. Insulation valve box; 9. Solenoid water valve; 10. Self-return air valve; 11. Water outlet pipe; 12. Squat toilet; 13. Induction switch; 14. Mop pool; 15. Manual delay switch; 16. Urine pool; 17. Wash basin; 18. Diversion pipe; 19. Manual water valve; 20. Electric belt; 21. Insulation cotton; 22. Sewer pipe; 23. Electric control box; 24. Air pump; 25. Air pipe; 26. Normally closed electromagnetic air valve; 27. Normally open electromagnetic air valve; 28. Pressure water storage tank; 29. ​​One-way water valve; 30. Branch air valve; 31. Branch air pipe; 32. Four-way; 33. Induction water valve. DETAILED DESCRIPTION

[0020] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer, the present invention is further described in detail in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. For example, the title of the invention is an automatic emptying antifreeze system for water supply pipes in public toilets, which is not limited to public toilets, but can also be applied to household toilets. Any toilet can use the solution of the present invention. The public toilets listed in the present invention are only used as a key example because the amount of public toilets that need to be renovated is large. Rural household toilets, urban public toilets, and other toilets with inconvenient heating can all be used. Therefore, the title of the present invention cannot limit the use scenario of the present invention.

[0021] Please also read Figure 1 and Figure 3 The automatic emptying and antifreezing system for the water supply pipe of a public toilet provided by the present invention is now described. The automatic emptying and antifreezing system for the water supply pipe of a public toilet comprises: a water storage unit 1, an insulation valve box 8, a water delivery pipe 6, a water outlet pipe 11, a driving unit, and a control unit.

[0022] The water storage unit 1 is used to store water for public toilets, and the water storage unit 1 is arranged below the frozen soil layer on the ground; the insulation valve box 8 is arranged in the toilet; the first end of the water pipe 6 is used to connect to the water storage unit 1, and the second end extends to the inside of the insulation valve box 8, and the second end of the water pipe 6 is provided with a self-return valve 10 at the highest point in the horizontal direction; the self-return valve 10 is located in the insulation valve box 8.

[0023] There is at least one water outlet pipe 11; one end of the water outlet pipe 11 is connected to the water-using appliance, and the other end is connected to the second end of the water supply pipe 6, and the end of the water outlet pipe 11 connected to the water-using appliance is lower than the other end connected to the water supply pipe 6; a self-return valve 10 is provided at the highest point of the water outlet pipe 11 in the horizontal direction; an electromagnetic water valve 9 is also provided on the water outlet pipe 11; the driving unit is used to provide power to transport the water in the water storage unit 1 to the water-using appliance in the public toilet through the water supply pipe 6 and the water outlet pipe 11; the control unit is electrically connected to the driving unit and the electromagnetic water valve 9 respectively.

[0024] When the water-using appliances in the public toilet need water, the control unit controls the driving unit to start and the electromagnetic water valve 9 corresponding to the water outlet pipe 11 is opened; the water in the water storage unit 1 is transported to the water-using appliances through the water supply pipe 6 and the water outlet pipe 11; when the water is used, the electromagnetic water valve 9 is closed, and the return air valve 10 is automatically opened, and the water in the water supply pipe 6 flows back to the water storage unit 1, and the water in the water outlet pipe 11 is discharged to the water-using appliances.

[0025] The beneficial effect of the automatic emptying and antifreezing system for the public toilet water supply pipe provided by the present invention is that: compared with the prior art, by arranging the self-return valve 10 at the highest horizontal position of the water supply pipe 6 and the water outlet pipe 11, when the water-using appliances in the public toilet need water, the control unit controls the drive unit to start and the electromagnetic water valve 9 corresponding to the water outlet pipe 11 is opened; the water in the water storage unit 1 is transported to the water-using appliances through the water supply pipe 6 and the water outlet pipe 11; when the water is used, the electromagnetic water valve 9 is closed, and since a negative pressure state appears inside the water supply pipe 6 and the water outlet pipe 11, the self-return valve 10 is automatically opened, and the water in the water supply pipe 6 flows back to the water storage unit 1, and the water in the water outlet pipe 11 is discharged to the water-using appliances, and the water supply pipe 6 and the water outlet pipe 11 are both in an empty pipe antifreezing state. At the same time, the thermal insulation valve box 8 wraps the electromagnetic water valve 9 and the self-return air valve 10, which has the effect of heat preservation and anti-freezing, and will not directly allow the low-temperature gas from the outside to enter the water supply pipe 6 and the water outlet pipe 11, causing the residual water in the pipe to freeze. This double protection measure avoids the problem of the water supply pipe 6 and the water outlet pipe 11 freezing and blocking the toilet and making it unusable.

[0026] As a specific implementation of the automatic emptying and antifreezing system for the public toilet water supply pipe provided by the present invention, please refer to Figure 1-Figure 4 When the number of the water outlet pipes 11 is more than two, a connecting pipe 7 is provided in the insulation valve box 8, and the water delivery pipe 6 is connected with the water outlet pipe 11 through the connecting pipe 7. In the specific implementation process, the water delivery pipe 6 can also be connected with the lowest end of the connecting pipe 7, and then the self-return valve 10 on the water delivery pipe 6 is set at the highest point of the connecting pipe 7, so that the water in the connecting pipe 7 can be discharged. Of course, the connecting pipe 7 can also be regarded as a part of the water delivery pipe 6.

[0027] As a specific embodiment of the automatic emptying and antifreezing system for the water supply pipe of a public toilet provided by the present invention, in order to ensure the drainage effect of the water supply pipe 6 and the water outlet pipe 11, the electromagnetic water valve 9 can be set to delay closing. When the self-return valve 10 of the water outlet pipe 11 is close to the electromagnetic water valve 9 and the distance between the electromagnetic water valve 9 and the water supply pipe 6 is set as close as possible, even if the electromagnetic water valve 9 is not closed with a delay, the effect of emptying the pipe can be achieved.

[0028] As a specific implementation of the automatic emptying and antifreezing system for the public toilet water supply pipe provided by the present invention, please refer to Figure 1-Figure 4 , along the water flow direction of the outlet pipe 11, the electromagnetic water valve 9 on the outlet pipe 11 is located in front of the self-return valve 10. The purpose of this setting is that when the electromagnetic water valve 9 is not closed with delay or the delay closing fails, it can still be used normally. The delay is only set to reduce the fault tolerance rate.

[0029] If the electromagnetic water valve 9 on the water outlet pipe 11 is located at the rear side of the air return valve 10 along the water flow direction of the water outlet pipe 11, the electromagnetic water valve 9 must be set to delay closing.

[0030] As a specific implementation of the automatic emptying and antifreezing system for the public toilet water supply pipe provided by the present invention, please refer to Figure 1-Figure 4 , also includes a water pipe 4 for conveying water to the water storage unit 1, and a water full stop valve 5 is provided on the water pipe 4. The water full stop valve 5 at the tail end of the water pipe 4 can automatically store water in the water storage unit 1.

[0031] The water-using utensil may be a utensil with a large water consumption, such as a squat toilet 12 or a mop pool 14, or may be a utensil with a small water consumption.

[0032] As a specific implementation of the automatic emptying and antifreezing system for the public toilet water supply pipe provided by the present invention, please refer to Figure 2In order to save energy and reduce costs, the water pipe 4 is also provided with a water branch pipe 41 connected to the water-using appliance, and the water branch pipe 41 is provided with an electromagnetic water valve 9; along the water flow direction of the water branch pipe 41, the water branch pipe 41 is located at the rear side of the electromagnetic water valve 9 and is also provided with a diversion pipe 18, and the water flow of the diversion pipe 18 is smaller than the water flow of the water branch pipe 41; the water branch pipe 41 is also provided with a thermal insulation cotton 21 for wrapping the electromagnetic water valve 9 and the connection between the water branch pipe 41 and the diversion pipe 18, and the diversion pipe 18 extends to the outside of the thermal insulation cotton 21.

[0033] The water-using appliances here can be appliances that do not require high water pressure and large flow, such as urine and toilet 16 and wash basin 17. For example, two vertical tap water branches 41 for urine and toilet 16 and wash basin 17 are directly connected from the underground tap water pipe 4. Solenoid valves 9 are connected in series in the two branch tap water branches 41, and three-way diverter pipes 18 are connected to the upper parts of the solenoid valves 9 of the two tap water branches 41. When the urine and toilet 16 and wash basin 17 use water, water flows from the corresponding diverter pipes 18 to the sewer pipe 22 or the water storage unit 1. When the water is stopped, the water in the three-way and above pipes of the tap water branch pipe 41 slowly flows out through the corresponding diverter pipe 18, and the empty pipe state plays an anti-freezing role. The lower part of the tap water branch pipe 41 is strengthened with thermal insulation cotton 21.

[0034] Two shunt pipes 18 are provided with manual water valves 19 at different positions of the heat-insulating cotton 21. The manual valve can adjust a very small shunt flow, and is in a closed state in spring, autumn and summer.

[0035] As a specific implementation of the automatic emptying and antifreezing system for the public toilet water supply pipe provided by the present invention, please refer to Figure 2 A heating element is provided in the heat-insulating cotton 21 near the tap water branch pipe 41. The heating element can be an electric belt 20. It is ensured that the water temperature in the tap water branch pipe 41 does not reach the freezing temperature.

[0036] As a specific implementation of the automatic emptying and antifreezing system for the public toilet water supply pipe provided by the present invention, please refer to Figure 1-Figure 2 The driving unit is a submersible pump 3, the accessories are easy to obtain, and the replacement and maintenance are relatively convenient.

[0037] As a specific implementation of the automatic emptying and antifreezing system for the public toilet water supply pipe provided by the present invention, please refer to Figure 3-Figure 4The driving unit includes: a pressure water storage tank 28, an air delivery pipe 25 and an air pump 24. The pressure water storage tank 28 is arranged in the water storage unit 1, and the first end of the water delivery pipe 6 extends to the bottom of the pressure water storage tank 28; the lower end of the pressure water storage tank 28 is also provided with a one-way water valve 29 for water inlet; the first end of the air delivery pipe 25 is connected to the upper part of the pressure water storage tank 28, and the second end extends to the outside of the water storage unit 1; the air pump 24 is connected to the second end of the air delivery pipe 25, and is used to deliver gas to the pressure water storage tank 28. The pressure water storage tank 28 can pressurize the internal water into the water delivery pipe 6 through pressure. Specifically, the pressure water storage tank 28 and the air pump 24 are connected by the air delivery pipe 25, and the normally closed electromagnetic air valve 26 and the normally open electromagnetic air valve 27 are connected in the air delivery pipe 25 to ensure that the air pump 24 can deliver gas to the pressure water storage tank 28.

[0038] As a specific implementation of the automatic emptying and antifreezing system for the public toilet water supply pipe provided by the present invention, please refer to Figure 3-Figure 4 In order to save energy and reduce costs, the automatic emptying and antifreeze system for the public toilet water supply pipeline also includes a tap water pipe 4 for conveying water to the water storage unit 1, and a water full stop valve 5 is provided on the tap water pipe 4.

[0039] The tap water pipe 4 is also provided with a tap water branch pipe 41 connected to the water-using appliance via the air pump 24; the air pump 24 is also provided with a branch air pipe 31, which is connected to the end of the tap water branch pipe 41, and a branch air valve 30 is provided on the branch air pipe 31; the tap water branch pipe 41 is also provided with a water distribution pipeline connected to the water-using appliance, and an induction water valve 33 is provided on the water distribution pipeline.

[0040] When using a water-using appliance, the corresponding induction water valve 33 opens and water flows out. When the induction water valve 33 is closed with a delay, the branch air valve 30 in the branch air pipe 31 opens first, and the gas in the branch air pipe 31 discharges the water in the water distribution pipeline. The induction water valve 33 is then closed (the induction water valve 33 can also be closed without delay. In this case, the water in the water distribution pipeline needs to be discharged freely). Then, the gas in the branch air pipe 31 presses the water in the tap water branch pipe 41 into the underground horizontal tap water pipe 4. The branch air valve 30 is then closed to make the tap water branch pipe 41 an empty pipe state. When the water-using appliance is used again, the corresponding induction water valve 33 opens the water distribution pipeline to discharge gas first and then water. This is to achieve the effect of antifreeze. Specifically, the water-using appliances here are urinals 16, wash basins 17 and other appliances that do not require high water pressure and large flow. Refer to Figure 4 The branch gas circuit 31 , the tap water branch pipe 41 , and the two water distribution pipelines are connected through a four-way connection 32 .

[0041] As a specific implementation of the automatic emptying and antifreezing system for the public toilet water supply pipe provided by the present invention, please refer to Figure 1-Figure 4In order to ensure that the electromagnetic water valve 9 and the self-return air valve 10 in the insulation valve box 8 cannot work normally because the water film attached to the surface of the movable parts in the valve may freeze and stick when the temperature is lower than 0°C, a heating element is also provided in the insulation valve box 8. Specifically, an electric belt 20 or other heating element is added in the insulation valve box 8 to cope with extreme cold weather and make the antifreeze toilet flush normally.

[0042] As a specific implementation of the automatic emptying and antifreezing system for the public toilet water supply pipe provided by the present invention, please refer to Figure 1-Figure 4 The upper side of the water storage unit 1 is also provided with a heat preservation cover 2 to ensure the heat preservation effect. The water stored in winter will not freeze by setting the water storage unit 1 below the frozen soil layer. The water storage unit 1 can be set below the frozen soil layer underground in the toilet, or it can be set below the frozen soil layer outdoors. The water storage unit 1 is a water storage tank or a water storage pool. When it is a water storage tank or a water storage pool, it is necessary to ensure its sealing effect and prevent water leakage or seepage.

[0043] As a specific implementation of the automatic emptying and antifreezing system for the public toilet water supply pipe provided by the present invention, please refer to Figure 1-Figure 4 The control unit includes a power supply box, an induction switch 13, a manual delay switch 15, an electric control box 23, a chip and other conventional control contents, as long as they can solve the control logic proposed in this application. The electrical connection mentioned in this application can be a signal line connection or a wireless communication connection.

[0044] As a specific implementation of the automatic emptying and antifreezing system for the public toilet water supply pipe provided by the present invention, please refer to Figure 2 When a squat toilet 12 is used by someone, the corresponding induction switch 13 is blocked and the delay relay in the electric control box 23 is powered off. When the person leaves, the induction switch 13 is turned on, and the delay relay in the electric control box 23 is turned on. At the same time, the water pump 3 and the electromagnetic water valve 9 of the corresponding squat toilet are powered on at the same time. The water pump 3 works, and the electromagnetic water valve 9 is also opened. Water passes through the water pipe 6, the self-return valve 10 connected to the water pipe 6, the connecting pipe 7, the electromagnetic water valve 9, the water outlet pipe 11 and the self-return valve 10 and the water outlet pipe 11 connected in series therein to the squat toilet 12, and flushes for a period of time. The specific optimal flushing time can be freely set by the corresponding time relay in the electric control box 23, and is generally set to 6 seconds.

[0045] After the delay time is up, the water pump 3 is closed first, and the electromagnetic water valve 9 is closed after a delay by the delay circuit corresponding to the electric control box 23. During the time period of delayed closing of the electromagnetic water valve 9, the water pipes before and after the electromagnetic water valve 9 are in a negative pressure state. The self-return valve 10 is opened under the action of the negative pressure, and air enters the water pipe 6 and the water outlet pipe 11. The water in the pipe flows back to the water storage tank through the water pipe 6 and the water pump 3, and flows to the squatting pit or mop pool 14 through the water outlet pipe 11. The water pipe 6 and the water outlet pipe 11 are in an empty pipe anti-freezing state, thereby avoiding the problem of the water pipe 6 and the water outlet pipe 11 freezing and blocking the toilet and making it unusable.

[0046] In order to ensure that the electromagnetic water valve 9 and the self-return air valve 10 in the above-mentioned insulation valve box 8 cannot work normally due to the freezing and adhesion of water film on the surface of the movable parts in the valve when the temperature is lower than 0°C, an electric heating belt 20 or other heating element is added to the insulation valve box 8 to cope with extreme cold weather and make the antifreeze toilet flush normally.

[0047] As a specific implementation of the automatic emptying and antifreezing system for the public toilet water supply pipe provided by the present invention, please refer to Figure 4, replace the water pump 3 with an air pump 24, set a pressure water tank 28 at the bottom of the water tank, the water pipe 6 extends into the pressure water tank 28 close to the bottom, and a one-way water valve 29 is also set at the bottom of the pressure water tank 28. The pressure water tank 28 and the air pump 24 are connected by an air pipe 25. The normally closed electromagnetic valve and the normally open electromagnetic valve are connected in the air pipe 25. When a squat toilet 12 is used by someone, the corresponding induction switch 13 is blocked, the delay relay in the electric control box 23 is powered off, and the induction switch 13 is blocked when the person leaves. 13 is turned on or the manual delay switch 15 is turned on, the delay relay in the electric control box 23 is energized, the corresponding electromagnetic water valve 9 is opened, the normally closed electromagnetic gas valve is opened, and the normally open electromagnetic gas valve is closed. The air pump 24 quickly sends the gas in the gas storage tank to the pressure water storage tank 28 through the gas pipe 25. After the water in the pressure water storage tank 28 is pressurized, the one-way water valve 29 is closed, and the pressurized water passes through the water pipe 6, the connecting pipe, the electromagnetic water valve 9, the self-return valve 10, and the water outlet pipe 11 to the corresponding squat toilet 12 for flushing or the mop pool 14. The water in the water tank 28 is partially pressed away by the air pressure. After the delay time for opening the normally closed electromagnetic air valve is reached, the normally closed electromagnetic water valve 9 is closed, the normally closed electromagnetic air valve 26 is closed, and the normally open electromagnetic air valve 27 is opened. The gas in the pressure water storage tank 28 is discharged through the normally open electromagnetic air valve 27, the air pressure in the pressure water storage tank 28 is reduced, the one-way water valve 29 is opened, and the water in the water tank enters the pressure water storage tank 28 (the water storage capacity of the pressure water storage tank 28 is designed to be greater than the maximum water consumption at one time, and the flushing time can be set according to needs). The delay time of the delay relay in the fixed electric control box 23 is determined until the pressure water storage tank 28 is filled with water. Due to the closure of the electromagnetic water valve 9, negative pressure is formed in the pipes before and after the electromagnetic water valve 9. Since the return air valve 10 is opened to intake air, the water in the pipe before the electromagnetic water valve 9 flows back to the pressure water storage tank 28 through the water pipe 6, and the water in the pipe after the electromagnetic water valve 9 is discharged to the squat toilet 12 or the mop pool 14 through the outlet pipe 11. At this time, the pipes before and after the electromagnetic water valve 9 are in an empty pipe state, avoiding the problem of freezing and blockage of the water pipes of the squat toilet 12 and the mop pool 14.

[0048] The above are only 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 in the protection scope of the present invention.

Claims

1. An automatic emptying and antifreezing system for water supply pipes in public toilets, characterized in that: include: A water storage unit, used for storing water for public toilets, wherein the water storage unit is arranged below the frozen soil layer on the ground; The insulated valve box is installed in the toilet; A water pipe, the first end of which is used to connect to the water storage unit, and the second end of which extends to the inside of the thermal insulation valve box. A self-return valve is provided at the highest point of the second end of the water pipe in the horizontal direction; the self-return valve is located in the thermal insulation valve box; A water outlet pipe, the number of which is at least one; one end of the water outlet pipe is connected to a water-using device, and the other end is connected to the second end of the water delivery pipe, and the end of the water outlet pipe connected to the water-using device is lower than the other end connected to the water delivery pipe; a self-return valve is provided at the highest point of the water outlet pipe in the horizontal direction; and a solenoid water valve is also provided on the water outlet pipe; A driving unit, used for providing power to transport the water in the water storage unit to water-using appliances in the public toilet through the water delivery pipe and the water outlet pipe; and A control unit, electrically connected to the driving unit and the electromagnetic water valve respectively; When the water-using appliances in the public toilet need water, the control unit controls the driving unit to start and the electromagnetic water valve of the corresponding water outlet pipe to open; the water in the water storage unit is transported to the water-using appliances through the water supply pipe and the water outlet pipe; when the water is finished, the electromagnetic water valve is closed, and the return air valve is automatically opened, the water in the water supply pipe flows back to the water storage unit, and the water in the water outlet pipe is discharged to the water-using appliances.

2. The automatic emptying and antifreezing system for the water supply pipe of a public toilet as claimed in claim 1, characterized in that: When the number of the water outlet pipes is more than two, a connecting pipe is provided in the thermal insulation valve box, and the water delivery pipe is connected with the water outlet pipe through the connecting pipe.

3. The automatic emptying and antifreezing system for the water supply pipe of a public toilet as claimed in claim 1, characterized in that: Along the water flow direction of the water outlet pipe, the electromagnetic water valve located on the water outlet pipe is located in front of the self-return valve.

4. The automatic emptying and antifreezing system for the water supply pipe of a public toilet as claimed in claim 1, characterized in that: It also includes a water pipe for delivering water to the water storage unit, and the water pipe is provided with a water full stop valve.

5. The automatic emptying and antifreezing system for the water supply pipe of a public toilet as claimed in claim 4, characterized in that: The tap water pipe is also provided with a tap water branch pipe connected to the water-using appliance, and the tap water branch pipe is provided with an electromagnetic water valve; along the water flow direction of the tap water branch pipe, the tap water branch pipe is also provided with a diversion pipe on the rear side of the electromagnetic water valve, and the water flow of the diversion pipe is smaller than the water flow of the tap water branch pipe; the tap water branch pipe is also provided with thermal insulation cotton for wrapping the electromagnetic water valve and the connection between the tap water branch pipe and the diversion pipe, and the diversion pipe extends to the outside of the thermal insulation cotton.

6. The automatic emptying and antifreezing system for the water supply pipe of a public toilet as claimed in claim 5, characterized in that: A heating element is arranged in the thermal insulation cotton at a position close to the tap water branch pipe.

7. The automatic emptying and antifreezing system for the water supply pipe of a public toilet as claimed in claim 1, characterized in that: The driving unit comprises: A pressure water storage tank is arranged in the water storage unit, and the first end of the water delivery pipe extends to the bottom of the pressure water storage tank; a one-way water valve for water inlet is also arranged at the lower end of the pressure water storage tank; An air delivery pipe, the first end of which is connected to the upper part of the pressure water storage tank, and the second end of which extends to the outside of the water storage unit; An air pump is connected to the second end of the air delivery pipe and is used to deliver gas to the interior of the pressure water storage tank.

8. The automatic emptying and antifreezing system for the water supply pipe of a public toilet as claimed in claim 7, characterized in that: It also includes a water pipe for delivering water to the water storage unit, and the water pipe is provided with a water full stop valve; The tap water pipe is also provided with a tap water branch pipe connected to the water-using appliance connected to the air pump; the air pump is also provided with a branch air pipe, the branch air pipe is connected to the end of the tap water branch pipe, and a branch air valve is provided on the branch air pipe; the tap water branch pipe is also provided with a water distribution pipeline connected to the water-using appliance, and an induction water valve is provided on the water distribution pipeline; When using water-using appliances, the corresponding induction water valve opens and water flows out. When the induction water valve is closed with a delay, the branch air valve in the branch air pipeline opens first, and the gas in the branch air pipeline discharges the water in the water distribution pipeline. The induction water valve is closed again to complete the process. Then, the gas in the branch air pipeline presses the water in the tap water branch pipe into the underground horizontal tap water pipe at the same time. Then, the branch air valve is closed to make the tap water branch pipe an empty pipe. When the water-using appliance is used again, the corresponding induction water valve opens the water distribution pipeline to discharge the gas first and then the water.

9. The automatic emptying and antifreezing system for water supply pipes in public toilets as claimed in claim 1, characterized in that: A heating element is also arranged in the thermal insulation valve box.

10. The automatic emptying and antifreezing system for water supply pipes in public toilets as claimed in claim 1, characterized in that: The water storage unit is a water storage tank or a water storage pool.

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