Water supply device with double water tanks

Through the combination of the air source heat pump water heater unit and the driving mechanism, the safety hazards and uneven water heat problems of heating wires in traditional water supply devices are solved, safe, constant temperature and stable water supply are achieved, and water resource waste is reduced.

CN223258388UActive Publication Date: 2025-08-22WUHAN XIAOYOUBANG NEW ENERGY TECHNOLOGY CO LTD
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Patent Information

Application Number
CN202422602093.7
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-10-28
Publication Date
2025-08-22
Estimated Expiration
2034-10-28

AI Technical Summary

Technical Problem

The heating wire in traditional water supply devices can easily lead to safety hazards and uneven distribution of water heat, resulting in poor constant temperature effect.

Method used

The water in the water tank is heated by an air source heat pump, and the water flow is promoted through the driving mechanism, combining temperature sensors and liquid level sensors to achieve intelligent management to ensure uniform heating of the water in the water tank and constant temperature supply.

Benefits of technology

It improves the safety of heating, realizes uniform heating of water in the water tank, achieves constant temperature effect, reduces the time for users to wait for hot water and waste of water resources, and improves the stability and user experience of water supply.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model is suitable for the technical field of double-water-tank water supply systems, and provides a double-water-tank water supply device which comprises a group of water tanks and an air source heat pump hot water unit arranged on one side of the group of water tanks and used for heating water in the water tanks. One side of each water tank is provided with a connecting pipe, and each connecting pipe is connected with the air source heat pump hot water unit; the temperature sensor and the liquid level sensor are respectively arranged in one group of water tanks; the drainage mechanism is arranged on one side of one group of water tanks and is used for regulating and controlling constant-pressure drainage of the water tanks; and the driving mechanism is arranged on one group of water tanks and is used for driving water in the water tanks to flow. The water supply device with the double water tanks has the advantages that heating is safe, constant-temperature water supply is achieved, water resource waste is reduced, and water supply stability and constant pressure are improved.
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Description

Technical Field

[0001] The utility model belongs to the technical field of double-water-tank water supply systems, in particular to a double-water-tank water supply device. Background Art

[0002] As people's lives improve, more and more families choose constant temperature and constant pressure water supply devices for water supply. In constant temperature and constant pressure water supply devices, a double water tank structure is required to meet the demand for hot water in seconds and reduce unnecessary waste of water resources.

[0003] At present, traditional water supply devices use heating wires to directly heat water, which can easily lead to unsafe heating. In addition, the water temperature in the water tank is unevenly distributed, resulting in the discharged hot water being unable to achieve a constant temperature effect, making it inconvenient to use. Utility Model Content

[0004] The utility model provides a water supply device with two water tanks, aiming to solve the problems raised in the above background technology that the conventional water supply device using electric heating wires is prone to safety hazards and the water temperature in the water tank is unevenly distributed, resulting in poor constant temperature effect.

[0005] In order to solve the above problems, the present invention is implemented as follows: a double water tank water supply device includes: a group of water tanks and an air source heat pump hot water unit arranged on one side of the group of water tanks for heating the water in the water tanks; a connecting pipe is installed on one side of the group of water tanks, and the connecting pipes in the group are connected to the air source heat pump hot water unit; a temperature sensor and a liquid level sensor are respectively installed in the group of water tanks; a drainage mechanism is arranged on one side of the group of water tanks for regulating the constant pressure drainage of the water tanks; and a driving mechanism is arranged on the group of water tanks for driving the flow of water in the water tanks.

[0006] Preferably, the drainage mechanism includes: a U-shaped tube fixedly installed on one side of a group of water tanks, two valves installed on the U-shaped tube, and the two valves are respectively located on one side of a group of water tanks; a water pump arranged on one side of the U-shaped tube, and the water pumping end of the water pump is fixedly connected to the U-shaped tube; a drainage pipe fixedly installed on the drainage end of the water pump; a pressure sensor mounted on the drainage pipe; and water inlet pipes respectively installed on one side of a group of water tanks.

[0007] Preferably, the driving mechanism includes: a connecting cylinder installed on one side of the water tank; a rotating rod rotatably installed on the connecting cylinder, one end of the rotating rod extending into the water tank; a stirring rod fixedly installed at one end of the rotating rod; a motor fixedly installed on one side of the water tank, the output shaft of the motor and the rotating rod are fixedly provided with bevel gears, and a group of the bevel gears are meshed with each other.

[0008] Preferably, a connecting frame is fixedly installed on one side of the water tank, a protective box is slidably provided between a group of water tanks, the protective box cover is provided on the motor and the rotating rod, an L-shaped rod is fixedly installed on the bottom of the protective box, the L-shaped rod is slidably connected to the connecting frame, the protective box consists of two half shells and a plurality of sealing strips, and the plurality of sealing strips are respectively in sliding contact with one side of a group of water tanks.

[0009] Preferably, two connecting blocks are fixedly installed on one side of the protective box, and the two connecting blocks are respectively located on the two half-shells, and screws are threadedly installed on the two connecting blocks. A protective cover is fixedly installed on any one of the half-shells, and a connecting cylinder is rotatably installed on one side of the protective cover, and a connecting rod is slidably installed on one side of the connecting cylinder, one end of the connecting rod is fixedly connected to the screw, and a handle is rotatably installed on one side of the protective cover, and the output rod of the handle extends into the protective cover and is fixedly connected to the fixed rod on one side of the connecting cylinder.

[0010] Preferably, the water tank consists of an outer shell, an insulation layer and an inner liner. The insulation layer is arranged in the outer shell, and the inner liner is arranged in the insulation layer. The insulation layer is made of polyurethane foam insulation material.

[0011] Preferably, an inclined plate is fixedly installed on the bottom of the inner wall of the water tank, and the top of the inclined plate is arranged in an inclined shape. A sewage pipe is installed on one side of the water tank, and the pipe mouth of the U-shaped pipe is higher than the pipe mouth of the sewage pipe.

[0012] Compared with the related art, the double water tank water supply device provided by the utility model has the following beneficial effects:

[0013] Compared with the existing technology, the dual-tank water supply device provided by this solution heats the water in the water tank by adopting an air source heat pump hot water unit, avoiding the safety hazards that may be caused by the direct heating method of the traditional heating wire. Through the cooperation of the connecting pipe, the air source heat pump hot water unit and the driving mechanism, it can ensure that the water in the water tank is evenly heated, thereby achieving a constant temperature effect. The design of the dual-tank structure can meet the demand for hot water in seconds, reducing the time users wait for hot water and the waste of water resources. Through the setting of the drainage mechanism, the stability and constant pressure of the water supply can be ensured, thereby improving the user experience. The application of temperature sensors and liquid level sensors enables the entire water supply device to be managed intelligently and automatically adjust the working status according to actual needs.

[0014] In summary, the double-water-tank water supply device of the present invention has the advantages of safe heating, constant temperature water supply, reduced water resource waste, and improved water supply stability and constant pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1This is a schematic diagram of the main cross-sectional structure of a water supply device with two water tanks provided by the utility model;

[0016] Figure 2 This is a side sectional structural diagram of a double water tank water supply device provided by the utility model;

[0017] Figure 3 This is a top view assembly drawing of a water tank, a U-shaped pipe and a water pump provided by the utility model;

[0018] Figure 4 This is an assembly diagram of multiple sprockets and chains provided by the utility model;

[0019] Figure 5 This is a side sectional structural diagram of the protective box provided by the present invention;

[0020] Figure 6 This is a three-dimensional structural diagram of the connecting tube and the connecting rod provided by the utility model;

[0021] Figure 7 for Figure 2 Schematic diagram of the enlarged structure of part A shown in FIG;

[0022] Figure 8 for Figure 2 Schematic diagram of the enlarged structure of part B shown in FIG;

[0023] Figure 9 for Figure 5 Schematic diagram of the enlarged structure of part C shown in FIG.

[0024] Figure markings: 1. Water tank; 101. Outer shell; 102. Insulation layer; 103. Inner tank; 2. Air source heat pump water heater; 3. Heat exchanger; 4. Connecting pipe; 5. Temperature sensor; 6. Liquid level sensor; 7. U-shaped pipe; 8. Valve; 9. Water pump; 10. Drain pipe; 11. Pressure sensor; 12. Water inlet pipe; 13. Connecting cylinder; 14. Rotating rod; 15. Stirring rod; 16. Motor; 17. Bevel gear; 18. Protective box; 19. L-shaped rod; 20. Connecting frame; 21. Connecting block; 22. Screw; 23. Protective cover; 24. Connecting cylinder; 25. Connecting rod; 26. Handle; 27. Sprocket; 28. Chain; 29. ​​Inclined plate; 30. Sewage pipe. DETAILED DESCRIPTION

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein in the specification of the application are for the purpose of describing specific embodiments only and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the description of the above-mentioned drawings, as well as any variations thereof, are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order; the terms "inside", "outside", "left", and "right" indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention.

[0026] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0027] The present invention provides a water supply device with two water tanks. Figure 1-9 As shown, the double water tank water supply device includes: a group of water tanks 1 and an air source heat pump hot water unit 2 provided on one side of the group of water tanks 1 for heating the water in the water tanks 1; a connecting pipe 4 is installed on one side of the group of water tanks 1, and a group of connecting pipes 4 are connected to the air source heat pump hot water unit 2; a temperature sensor 5 and a liquid level sensor 6 are respectively installed in the group of water tanks 1; a drainage mechanism is provided on one side of the group of water tanks 1 for regulating the constant pressure drainage of the water tanks 1; and a driving mechanism is provided on the group of water tanks 1 for driving the flow of water in the water tanks 1.

[0028] In this embodiment, when working, the air source heat pump water heater 2 heats the water in the water tank 1 instead of the traditional direct heating method of the heating wire, which improves the safety of heating. During the heating process, the circulating medium (refrigerant) of the air source heat pump water heater 2 absorbs heat from the air in the heat exchanger, and then transfers the heat to the water in the water tank 1, so that the water temperature increases. At the same time, the driving mechanism drives the water in the water tank 1 to flow, so as to further improve the uniformity and efficiency of water heating. A temperature sensor 5 and a liquid level sensor 6 are respectively installed in the water tank 1. These two sensors are used to monitor the temperature and liquid level of the water respectively. The temperature sensor 5 can feedback the temperature information of the water in real time to ensure that the water temperature reaches the preset constant temperature requirement. The liquid level sensor 6 can monitor the amount of water in the water tank to prevent the water supply effect from being affected by insufficient or excessive water. When needed When draining, the drainage mechanism will adjust the drainage speed and drainage volume of the water tank 1 according to the preset constant pressure requirements to ensure the stability and constant pressure of the water supply. By adopting the air source heat pump water heater 2 to heat the water in the water tank 1, the potential safety hazards caused by the direct heating method of the traditional heating wire are avoided. Through the cooperation of the connecting pipe, the air source heat pump water heater 2 and the driving mechanism, it can be ensured that the water in the water tank 1 is evenly heated, thereby achieving a constant temperature effect. The design of the dual water tank 1 structure can meet the demand for hot water in seconds, reducing the time users wait for hot water and the waste of water resources. Through the setting of the drainage mechanism, the stability and constant pressure of the water supply can be ensured, and the user experience is improved. The application of the temperature sensor 5 and the liquid level sensor 6 enables the entire water supply device to be managed intelligently and automatically adjust the working status according to actual needs.

[0029] In a further preferred embodiment of the present invention, the drainage mechanism includes: a U-shaped tube 7 fixedly installed on one side of a group of water tanks 1, two valves 8 are installed on the U-shaped tube 7, and the two valves 8 are respectively located on one side of a group of water tanks 1; a water pump 9 is arranged on one side of the U-shaped tube 7, and the water pumping end of the water pump 9 is fixedly connected to the U-shaped tube 7; a drainage pipe 10 fixedly installed on the drainage end of the water pump 9; a pressure sensor 11 is mounted on the drainage pipe 10; and a water inlet pipe 12 is respectively installed on one side of a group of water tanks 1.

[0030] In this embodiment, a water pump 9 arranged on one side of the U-shaped tube 7 can ensure that the water in the water tank 1 is smoothly pumped out. A drain pipe 10 is fixedly installed on the drainage end of the water pump 9 for discharging the pumped water. A pressure sensor 11 is set on the drain pipe 10 for real-time monitoring of pressure changes during the drainage process. Through the feedback of the pressure sensor 11, the working status of the water pump 9 and the valve 8 can be accurately controlled to ensure constant pressure during the drainage process. At the same time, in order to maintain the stability of the water volume in the water tank 1, a water inlet pipe 12 is also installed on one side of the water tank 1 for replenishing new water into the water tank 1. The design of the U-shaped tube 7 can ensure that the water flow is more stable during discharge, reduce the impact and fluctuation of the water flow, thereby improving the stability of drainage. The pressure sensor 11 monitors the pressure changes during the drainage process in real time and accurately controls the working status of the water pump 9 and the valve 8 to ensure constant pressure during the drainage process and improve the stability of water supply. The setting of the valve 8 can conveniently control the drainage speed and drainage volume of the water tank 1, and can be flexibly adjusted according to actual needs.

[0031] In a further preferred embodiment of the present invention, the driving mechanism includes: a connecting cylinder 13 installed on one side of the water tank 1; a rotating rod 14 rotatably installed on the connecting cylinder 13, one end of the rotating rod 14 extends into the water tank 1; a stirring rod 15 fixedly installed at one end of the rotating rod 14; a motor 16 fixedly installed on one side of the water tank 1, and a bevel gear 17 is fixedly provided on the output shaft of the motor 16 and the rotating rod 14, and a group of the bevel gears 17 are engaged with each other.

[0032] In this embodiment, while the water in the water tank 1 is being heated, the motor 16 is started, so that the motor 16 drives the bevel gear 17 to rotate, and the bevel gear 17 drives the rotating rod 14 to rotate the stirring rod 15, thereby driving the water in the water tank 1 to flow, ensuring that the water is heated evenly, and achieving more uniform heating and water supply. By driving the stirring rod 15 to rotate in the water tank 1 by the motor 16, it can be ensured that the water in the water tank 1 flows more evenly, thereby improving the uniformity of the water supply. The rotation of the stirring rod 15 can accelerate the convection and mixing of the water in the water tank 1, so that the heat is transferred to the entire water tank 1 more quickly, thereby improving the heating efficiency.

[0033] In a further preferred embodiment of the present invention, a connecting frame 20 is fixedly installed on one side of the water tank 1, and a protective box 18 is slidably provided between a group of the water tanks 1. The protective box 18 is covered on the motor 16 and the rotating rod 14. An L-shaped rod 19 is fixedly installed on the bottom of the protective box 18. The L-shaped rod 19 is slidably connected to the connecting frame 20. The protective box 18 consists of two half shells and a plurality of sealing strips, and the plurality of sealing strips are respectively in sliding contact with one side of a group of the water tanks 1.

[0034] In this embodiment, the protective box 18 is covered on the motor 16 and the rotating rod 14, which can effectively prevent dust, moisture and other impurities from entering, thereby extending the service life of these components. At the same time, multiple sealing strips are in sliding contact with one side of a group of water tanks 1, so as to ensure the sealing between the protective box 18 and the water tank 1 and prevent impurities and water from entering. When maintenance is required, the staff only needs to drive the protective box 18 to slide along the L-shaped rod 19, and then remove the protective box 18 from the L-shaped rod 19 to expose the motor 16, rotating rod 14 and other components for maintenance work. The protective box 18 can effectively protect key components such as the motor 16 and rotating rod 14 to prevent dust, moisture and other impurities from entering, thereby extending the service life of these components.

[0035] In a further preferred embodiment of the present invention, two connecting blocks 21 are fixedly installed on one side of the protective box 18, and the two connecting blocks 21 are respectively located on the two half-shells. Screws 22 are threadedly installed on the two connecting blocks 21, and a protective cover 23 is fixedly installed on any one of the half-shells. A connecting cylinder 24 is rotatably installed on one side of the protective cover 23, and a connecting rod 25 is slidably installed on one side of the connecting cylinder 24. One end of the connecting rod 25 is fixedly connected to the screw 22, and a handle 26 is rotatably installed on one side of the protective cover 23. The output rod of the handle 26 extends into the protective cover 23 and is fixedly connected to the fixed rod on one side of the connecting cylinder 24.

[0036] In this embodiment, two groups of connecting cylinders 24 are provided on the protection box 18. The fixing rods of the two groups of connecting cylinders 24 are fixedly sleeved with multiple groups of sprockets 27. Multiple chains 28 are sleeved on the multiple groups of sprockets 27. The multiple chains 28 are U-shaped. When the protection box 18 needs to be fixed on the water tank 1 to protect the motor 16, the handle 26 is first rotated to drive the fixing rod to rotate. At the same time, the fixing rod drives the sprocket 27 to rotate synchronously. Through the meshing operation of the sprocket 27 and the chain 28, the two groups of connecting cylinders 24 are rotated synchronously. When the connecting cylinder 24 rotates, it drives the connecting rod 25 to rotate, so that the connecting rod 25 drives the screw 22 to rotate, and the screw 22 is screwed in. The screw 22 is screwed into the connecting block 21 until its end is in close contact with the connecting block 21 on the right. When the screw 22 is screwed into the connecting block 21, the connecting rod 25 slides along the connecting tube 24. Since the connecting rod 25 is arranged in a rectangular shape, it is ensured that the connecting rod 25 will not slip in the connecting tube 24, which is conducive to the installation of the screw 22. Through the cooperation of the handle 26, the connecting tube 24 and the connecting rod 25, the screw 22 can be easily rotated, thereby quickly loading and unloading the protective box 18, which improves the convenience of operation. The threaded connection design of the screw 22 and the connecting block 21 can ensure the stability and firmness of the protective box 18 when closed, and prevent it from loosening due to vibration or external force.

[0037] In a further preferred embodiment of the present invention, the water tank 1 is composed of an outer shell 101, an insulation layer 102 and an inner liner 103. The insulation layer 102 is arranged in the outer shell 101, and the inner liner 103 is arranged in the insulation layer 102. The material of the insulation layer 102 is polyurethane foam insulation material.

[0038] In this embodiment, the inner tank 103 is arranged in the insulation layer 102 and is in direct contact with the hot water. The material of the inner tank 103 is stainless steel, which has good corrosion resistance and high temperature resistance to ensure stability and safety in long-term use. The insulation layer 102 is arranged between the outer shell 101 and the inner tank 103. Its material adopts high-efficiency insulation material polyurethane foam, which has excellent thermal insulation performance and can effectively reduce the heat loss inside the water tank 1, thereby increasing the insulation time of hot water. By adding the insulation layer 102 and using high-efficiency insulation materials, the insulation performance of the water tank 1 is significantly improved, the insulation time of hot water is extended, and energy waste is reduced.

[0039] In a further preferred embodiment of the present invention, an inclined plate 29 is fixedly installed on the bottom of the inner wall of the water tank 1, and the top of the inclined plate 29 is arranged in an inclined shape. A sewage pipe 30 is installed on one side of the water tank 1, and the pipe mouth of the U-shaped tube 7 is higher than the pipe mouth of the sewage pipe 30.

[0040] In this embodiment, after the water in the water tank 1 has been used for a long time, some impurities or dirt may be deposited at the bottom. Due to the inclined design of the inclined plate 29, these impurities or dirt will slide along the inclined plate 29 to the vicinity of the drain pipe 30. At this time, just open the valve of the drain pipe 30, and these impurities or dirt can be easily discharged from the water tank 1, thereby keeping the inside of the water tank 1 clean.

[0041] In summary, compared with related technologies, this device has the advantages of safe heating, constant temperature water supply, reduced water resource waste, and improved water supply stability and constant pressure.

[0042] In the several embodiments provided in this application, it should be understood that the disclosed device can be implemented in other ways.

[0043] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the scope of protection of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, rather than all embodiments. Based on these embodiments, all other embodiments obtained by ordinary technicians in this field without making any creative work are within the scope to be protected by the present invention. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in this field can still combine, add, delete or make other adjustments to the features in the various embodiments of the present invention according to the circumstances without conflict, without making any creative work, so as to obtain different other technical solutions that do not deviate from the concept of the present invention in essence, and these technical solutions also fall within the scope to be protected by the present invention.

Claims

1. A double water tank water supply device, characterized in that: include: A group of water tanks and an air source heat pump water heater unit provided on one side of the group of water tanks for heating water in the water tanks; A connecting pipe is installed on one side of each of the water tanks, and each of the connecting pipes is connected to the air source heat pump water heater unit; a temperature sensor and a liquid level sensor respectively installed in a group of the water tanks; A drainage mechanism provided on one side of a group of water tanks for regulating the constant pressure drainage of the water tanks; A driving mechanism is provided on a group of the water tanks for driving the water in the water tanks to flow.

2. The double water tank water supply device according to claim 1, characterized in that: The drainage mechanism comprises: A U-shaped tube fixedly mounted on one side of a group of water tanks, wherein two valves are mounted on the U-shaped tube, and the two valves are respectively located on one side of a group of water tanks; A water pump is provided on one side of the U-shaped tube, wherein a pumping end of the water pump is fixedly connected to the U-shaped tube; A drain pipe fixedly mounted on the drain end of the water pump; a pressure sensor sleeved on the drain pipe; The water inlet pipes are respectively installed on one side of a group of water tanks.

3. The double water tank water supply device according to claim 2, characterized in that: The driving mechanism comprises: A connecting cylinder installed on one side of the water tank; Rotating a rotating rod mounted on the connecting tube, wherein one end of the rotating rod extends into the water tank; a stirring rod fixedly mounted on one end of the rotating rod; A motor is fixedly mounted on one side of the water tank, and a bevel gear is fixedly sleeved on the output shaft of the motor and the rotating rod, and a group of the bevel gears are meshed with each other.

4. The double water tank water supply device according to claim 3, characterized in that: A connecting frame is fixedly installed on one side of the water tank, and a protective box is slidably provided between a group of water tanks. The protective box cover is provided on the motor and the rotating rod. An L-shaped rod is fixedly installed on the bottom of the protective box, and the L-shaped rod is slidably connected to the connecting frame. The protective box consists of two half shells and multiple sealing strips, and the multiple sealing strips are respectively in sliding contact with one side of a group of water tanks.

5. The double water tank water supply device according to claim 4, characterized in that: Two connecting blocks are fixedly installed on one side of the protective box, and the two connecting blocks are respectively located on the two half-shells. Screws are threadedly installed on the two connecting blocks, and a protective cover is fixedly installed on any one of the half-shells. A connecting cylinder is rotatably installed on one side of the protective cover, and a connecting rod is slidably installed on one side of the connecting cylinder. One end of the connecting rod is fixedly connected to the screw, and a handle is rotatably installed on one side of the protective cover. The output rod of the handle extends into the protective cover and is fixedly connected to the fixed rod on one side of the connecting cylinder.

6. The double water tank water supply device according to claim 1, characterized in that: The water tank consists of an outer shell, a heat-insulating layer and an inner liner. The heat-insulating layer is arranged in the outer shell, and the inner liner is arranged in the heat-insulating layer. The heat-insulating layer is made of polyurethane foam heat-insulating material.

7. The double water tank water supply device according to claim 2, characterized in that: An inclined plate is fixedly installed on the bottom of the inner wall of the water tank, and the top of the inclined plate is arranged in an inclined shape. A sewage pipe is installed on one side of the water tank, and the pipe mouth of the U-shaped pipe is higher than the pipe mouth of the sewage pipe.