CN220016166U - Water-saving tap and water-saving system - Google Patents

Abstract

The embodiment of the utility model discloses a water-saving tap and a water-saving system, comprising a water outlet pipeline, a return pipeline and a control module; the water outlet pipeline is provided with an instant heating module and a temperature detection device, and the temperature detection device is used for detecting the temperature of the pure water and feeding the pure water back to the control module; the water outlet pipeline is provided with a first water-saving valve for controlling the water flowing into the water outlet pipeline and the return pipeline to flow into the instant heating module; the water outlet pipeline is provided with a second water-saving valve for controlling the water output of the instant heating module and the water inflow of the return pipeline; when the water flow is overlarge, namely the water heated by the heating module does not reach the preset temperature, the control module controls the first water-saving valve and the second water-saving valve to flow into the return pipeline, and the water enters the heating module again to be circularly heated for a plurality of times until the water reaches the preset temperature and then is output. The technical problem that the reverse osmosis filter element is forced to generate a large amount of concentrated water so as to waste water resources due to the fact that the flow valve is used for controlling water flow to heat the instant heating module to the preset temperature in the prior art is solved.

Description

Water-saving tap and water-saving system

Technical Field

The utility model relates to the field of environmental protection and water saving, in particular to a water saving tap and a water saving system.

Background

Along with the development of science and technology, people pursue more comfortable life, the requirements on water quality and sanitation are gradually improved, and most families are equipped with drinking equipment. The drinking water equipment commonly used in families is a water purifying machine. The multifunctional water purifying and drinking machine overturns the traditional drinking mode, innovatively integrates the functions of water purification, drinking, refrigeration and heating, has three innovative technologies, and maximally meets the convenient, safe and healthy drinking requirements of consumers. The domestic water purifying and drinking machine can adopt a heating device to obtain hot water, wherein the heating device basically adopts an instant heating device, however, the heating time of the instant heating device is long, and for the heating requirement of the high-flux water purifying and drinking machine, the instant heating device can not heat a large amount of water to the temperature required to be reached in a short time. To solve this problem, the existing water purifying and drinking machine is generally provided with a flow valve at the upstream of the heating device, and the flow valve is used to control the amount of water flowing through the instant heating device, so that the water purifying and drinking machine can obtain hot water in a short time. However, due to the limitation of the water outlet flow of the flow valve, a large amount of raw water entering the filtering device is discharged from the concentrated water port, so that water resources are wasted, and the reverse osmosis filter element can be damaged due to the pressure rise in the reverse osmosis filter element, and the service life is influenced.

Disclosure of Invention

In view of the above, the utility model provides a water-saving faucet and a water-saving system, which are used for solving the problem of water resource waste of waterways in the prior art. In order to achieve one or a part or all of the above objects or other objects, the present utility model provides a water saving faucet, comprising a first water saving valve, a second water saving valve, a first pipeline, a second pipeline, a third pipeline, a return pipeline and a control module;

the first water saving valve is provided with a first valve water inlet, a second valve water inlet and a first valve water outlet; the first valve water inlet is communicated with one end of the first pipeline, the first valve water outlet is communicated with one end of the second pipeline, the second valve water inlet is communicated with one end of the return pipeline, and the other end of the first pipeline is communicated with the pure water pipeline;

the second pipeline is provided with an instant heating module and a temperature detection device, and the temperature detection device is positioned at the downstream of the instant heating module;

the second water-saving valve is provided with a first valve inflow port, a first valve outflow port and a second valve outflow port, the first valve inflow port is communicated with the other end of the second pipeline, the first valve outflow port is communicated with the other end of the return pipeline, the second valve outflow port is communicated with one end of the third pipeline, and the other end of the third pipeline is a pure water outlet;

the first pipeline is provided with a first direct-current small pump, and the first direct-current small pump is positioned at the upstream of the first water-saving valve;

the control module is electrically connected with the instant heating module, the temperature detection device, the first water-saving valve, the second water-saving valve and the first direct-current small pump respectively.

Preferably, the return line is provided with a second small direct-current pump, which is electrically connected with the control module.

Preferably, the return line is provided with a first non-return valve for the flow of water from the first valve outflow to the second valve inflow, said first non-return valve being located downstream of the second small direct-flow pump.

Preferably, the first pipeline is provided with a second check valve for supplying water to flow from the water inlet end of the first pipeline to the water inlet of the first valve, and the second check valve is positioned between the first direct-current small pump and the first water-saving valve.

Preferably, the second pipeline is provided with a flowmeter, the flowmeter is located between the first water-saving valve and the instant heating module, and the flowmeter is electrically connected with the control module.

The utility model provides a water saving system, which comprises the water saving tap.

Preferably, the water conservation system comprises a plain water conduit in communication with the first conduit.

Preferably, the water saving system further comprises a reverse osmosis filter element, a concentrated water pipeline and a water inlet pipeline;

the water inlet pipeline is provided with a booster pump, the booster pump is electrically connected with the control module, one end of the water inlet pipeline is communicated with the water inlet of the reverse osmosis filter element, and the other end of the water inlet pipeline is used for water inlet;

one end of the concentrated water pipeline is communicated with the wastewater port of the reverse osmosis filter element, and the other end of the concentrated water pipeline is used for discharging concentrated water;

one end of the pure water pipeline is communicated with the pure water port of the reverse osmosis filter element.

Preferably, the pure water pipeline is provided with a high-voltage switch, and the high-voltage switch is electrically connected with the control module.

Preferably, the water saving system further comprises a pre-filter element and a raw water pipeline;

one end of the raw water pipeline is communicated with the water inlet of the front filter element, the other end of the raw water pipeline is used for conveying raw water, and the water outlet of the front filter element is communicated with the water inlet pipeline.

The implementation of the embodiment of the utility model has the following beneficial effects:

if the user needs the warm water, pure water is pumped into the first pipeline by the first direct-current small pump, at the moment, the first valve water inlet and the first valve water outlet of the first water-saving valve are simultaneously opened, the second valve water inlet is closed, and the pure water flows into the second pipeline. Subsequently, the water inlet of the second water-saving valve and the second valve outflow port are simultaneously opened, the first valve outflow port is closed, and pure water flows into the third pipeline and finally flows out from the pure water outlet.

If the user needs hot water, pure water is pumped into the first pipeline by the first direct-current small pump, at the moment, the first valve water inlet of the first water-saving valve and the first valve water outlet are simultaneously opened, the second valve water inlet is closed, and pure water flows into the second pipeline. The control module controls the instant heating module to work, pure water flows to the position of the temperature detection device after being heated by the instant heating module, and the temperature detection device detects the water temperature of the pure water.

If the pure water temperature reaches the preset temperature, the control module controls the water inlet of the second water-saving valve and the outlet of the second valve to be simultaneously opened, the outlet of the first valve is closed, and the heated pure water is output.

If the pure water temperature does not reach the preset temperature, the control module controls the water inlet of the second water-saving valve and the first valve outflow opening to be simultaneously opened, and controls the first valve water outlet of the first water-saving valve and the second valve water inlet to be simultaneously opened, and the first valve water inlet to be closed, so that pure water does not flow into the third pipeline and flows into the return pipeline, and flows into the second pipeline again from the return pipeline, and the instant heating module is circularly heated for a plurality of times until the temperature detection device detects that the pure water temperature reaches the preset value. At this time, the first valve water inlet and the first valve water outlet of the first water-saving valve are simultaneously opened, the second valve water inlet is closed, and pure water flows into the second pipeline. Subsequently, the water inlet of the second water-saving valve and the second valve outlet are simultaneously opened, the first valve outlet is closed, and the pure water flows into the third pipeline, so that the heated pure water flows out from the pure water outlet.

According to the technical scheme, the flow valve is removed, pure water reaches the preset temperature in a repeated circulating heating mode, and the technical problem that water resource waste is caused by heating of the pure water due to the fact that the flow valve is adopted to control water flow in the prior art is solved.

Drawings

In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Wherein:

FIG. 1 is a schematic diagram of a water conservation faucet in one embodiment.

In the figure: 1. a water outlet pipeline; 11. an instant heating module; 12. a temperature detecting device; 13. a first water saving valve; 14. a second water saving valve; 15. a first direct current small pump; 16. a second check valve; 17. a flow meter; 18. a pure water outlet; 2. a return line; 21. a second small DC pump; 22. a first check valve; 31. a pure water pipeline; 311. a high voltage switch; 312. a pure water TDS device; 32. a reverse osmosis filter element; 33. a concentrate pipeline; 331. a flush valve; 34. a water inlet pipeline; 341. a booster pump; 342. a water inlet valve; 343. a water inflow TDS device; 35. a filter element is arranged in front; 36. a raw water pipeline; 19. a first pipeline; 10. a second pipeline; 20. and a third pipeline.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

As shown in fig. 1, an embodiment of the present utility model provides a water saving faucet, which includes a first water saving valve 13, a second water saving valve 14, a first pipeline 19, a second pipeline 10 and a third pipeline 20, a return pipeline 2 and a control module.

The first water saving valve 13 is provided with a first valve water inlet, a second valve water inlet and a first valve water outlet; the first valve water inlet is communicated with one end of a first pipeline 19, the first valve water outlet is communicated with one end of a second pipeline 10, the second valve water inlet is communicated with one end of a return pipeline 2, and the other end of the first pipeline 19 is communicated with a pure water pipeline 31.

The second pipe 10 is provided with an instant module 11 and a temperature detection device 12, the temperature detection device 12 being located downstream of the instant module 11.

The second water-saving valve 14 has a first valve inflow port, a first valve outflow port and a second valve outflow port, the first valve inflow port is communicated with the other end of the second pipeline 10, the first valve outflow port is communicated with the other end of the return pipeline 2, the second valve outflow port is communicated with one end of the third pipeline 20, and the other end of the third pipeline 20 is a pure water outlet 18.

The first line 19 is provided with a first small dc pump 15, the first small dc pump 15 being located upstream of the first water-saving valve 13.

The control module is electrically connected with the instant heating module 11, the temperature detection device 12, the first water-saving valve 13, the second water-saving valve 14 and the first direct-current small pump 15 respectively.

In this embodiment, if the user needs the warm water, pure water is pumped into the first pipeline 19 by the first small dc pump 15, and at this time, the first valve water inlet and the first valve water outlet of the first water saving valve 13 are simultaneously opened, the second valve water inlet is closed, and pure water flows into the second pipeline 10. Subsequently, the water inlet of the second water-saving valve 14 and the second valve outlet are simultaneously opened, the first valve outlet is closed, and pure water flows into the third pipe 20 and finally flows out of the pure water outlet 18.

If the user needs hot water, pure water is pumped into the first pipeline 19 by the first direct-current small pump 15, at the moment, the first valve water inlet and the first valve water outlet of the first water-saving valve 13 are simultaneously opened, the second valve water inlet is closed, and pure water flows into the second pipeline 10. The control module controls the instant heating module 11 to work, pure water flows to the position of the temperature detection device 12 after being heated by the instant heating module 11, and the temperature detection device 12 detects the water temperature of the pure water.

If the pure water temperature reaches the preset temperature, the control module controls the water inlet of the second water-saving valve 14 and the second valve outflow opening to be simultaneously opened, the first valve outflow opening is closed, and the heated pure water is output.

If the pure water temperature does not reach the preset temperature, the control module controls the water inlet of the second water-saving valve 14 and the first valve outflow opening to be simultaneously opened, and controls the first valve water outlet of the first water-saving valve 13 and the second valve water inlet to be simultaneously opened, and the first valve water inlet to be closed, so that pure water does not flow into the third pipeline 20, flows into the return pipeline 2, flows into the second pipeline 10 again from the return pipeline 2, and is circularly heated in the instant heating module 11 for a plurality of times until the temperature detection device 12 detects that the pure water temperature reaches the preset value. At this time, the first valve water inlet and the first valve water outlet of the first water saving valve 13 are simultaneously opened, the second valve water inlet is closed, and pure water flows into the second pipeline 10. Subsequently, the water inlet of the second water-saving valve 14 and the second valve outflow opening are simultaneously opened, the first valve outflow opening is closed, and pure water flows into the third pipe 20, so that heated pure water flows out from the pure water outlet 18.

According to the technical scheme, the flow valve is removed, pure water reaches the preset temperature in a repeated circulating heating mode, and the technical problem that water resource waste is caused by heating of the pure water due to the fact that the flow valve is adopted to control water flow in the prior art is solved.

Specifically, the first water-saving valve 13 is a two-in one-out electromagnetic valve and is provided with a first valve water inlet, a second valve water inlet and a first valve water outlet. The first valve water inlet and the second valve water inlet are in different states constantly, namely, if the first valve water inlet is opened, the second valve water inlet is closed, and if the first valve water inlet is closed, the second valve water inlet is opened. The first water-saving valve 13 is electrically connected with the control module, and the state of the first valve water inlet and the second valve water inlet is controlled by the control module.

Specifically, the second water-saving valve 14 is a two-inlet solenoid valve, and is provided with a first valve inflow port, a first valve outflow port and a second valve outflow port. Wherein the second valve outflow opening and the first valve outflow opening are constantly in different states, i.e. the first valve outflow opening is closed if the second valve outflow opening is opened and the first valve outflow opening is opened if the second valve outflow opening is closed. The second water-saving valve 14 is electrically connected with the control module, and the state of the second valve outflow opening and the first valve outflow opening is controlled by the control module.

Specifically, the first conduit 19 is provided with a first small dc pump 15, the first small dc pump 15 being located upstream of the first water-saving valve 13. The first small dc pump 15 is used to pump pure water into the first pipeline 19, when the first pipeline 19 is located at a high position, for example: when it is placed in the tap, if a certain amount of water is stored in the instant heating module 11, a certain pressure is formed, and at this time, the water pressure in the pure water pipeline 31 will not be enough to send pure water into the first pipeline 19, and the first small direct current pump 15 is required to pump water into the first pipeline 19, and then the water is input into the instant heating module 11 for heating. The first small direct-current pump 15 is electrically connected with the control module, and when the user needs water, the control module controls the first small direct-current pump 15 to work so as to pump water into the first pipeline 19.

Specifically, the temperature detecting device 12 may be disposed on a pipe wall of the second pipe 10 to measure the water temperature in the second pipe 10, or the temperature detecting device 12 may be disposed in the second pipe 10 to directly contact with the pure water in the second pipe 10 to measure the pure water temperature. The installation position and the detection mode of the temperature detection device 12 are not further limited here.

Further, the return line 2 is provided with a second small direct current pump 21, and the second small direct current pump 21 is electrically connected with the control module.

In this embodiment, the second small direct-current pump 21 is used for pumping water in the water outlet pipeline 1 into the water flow in the return pipeline 2. For example: when the water quantity in the instant heating module 11 is too small and the formed water pressure is too small, and the water in the water outlet pipeline 1 flows into the return pipeline 2, the second small direct-current pump 21 pumps the water in the water outlet pipeline 1 into the return pipeline 2, so that the return is realized rapidly.

Further, the return line 2 is provided with a first non-return valve 22 for supplying water from the first valve outlet to the second valve inlet, the first non-return valve 22 being located downstream of the second small direct-flow pump 21.

In the present embodiment, the first non-return valve 22 is used to prevent water in the return line 2 from flowing back into the second line 10.

Further, the first pipe 19 is provided with a second non-return valve 16 for supplying water from the water inlet end of the first pipe 19 to the water inlet of the first valve, and the second non-return valve 16 is located between the first small direct-flow pump 15 and the first water-saving valve 13.

In the present embodiment, the second check valve 16 is used to prevent water pumped into the first line 19 from flowing back into the pure water line 31.

Further, the second pipeline 10 is provided with a flowmeter 17, the flowmeter 17 is positioned between the first water saving valve 13 and the instant heating module 11, and the flowmeter 17 is electrically connected with the control module.

In this embodiment, the flow meter 17 is used for detecting the water flow rate pumped into the instant heating module 11, if the flow meter 17 detects that the water pumped into the instant heating module 11 is too small, the instant heating module 11 is at risk of dry heating, at this time, the flow meter 17 sends a detection signal to the control module, and the control module controls the first small direct-current pump 15 to pump pure water into the first pipeline 19, and controls the first water-saving valve 13 to open the first valve water inlet and the first valve water outlet, and close the second valve water inlet, so that the pure water is pumped into the instant heating module 11.

The embodiment of the utility model also provides a water saving system which comprises the water saving tap.

Further, the water saving system includes a pure water pipe 31, and the pure water pipe 31 communicates with the first pipe 19.

Further, the water saving system also comprises a reverse osmosis filter element 32, a concentrated water pipeline 33 and an water inlet pipeline 34.

The water inlet pipeline 34 is provided with a booster pump 341, the booster pump 341 is electrically connected with the control module, one end of the water inlet pipeline 34 is communicated with a water inlet of the reverse osmosis filter element 32, and the other end of the water inlet pipeline 34 is used for water inlet.

One end of the concentrated water pipeline 33 is communicated with the wastewater port of the reverse osmosis filter element 32, and the other end of the concentrated water pipeline 33 is used for discharging concentrated water.

One end of the pure water pipeline 31 is communicated with a pure water port of the reverse osmosis filter element 32.

In this embodiment, pure water generated by the reverse osmosis filter element 32 is pumped into the water outlet pipeline 1, and the pure water is circularly heated to reach the preset temperature through the return pipeline 2 for many times, so that the technical problem that the instant heating module 11 is heated to the preset temperature by controlling the water quantity flowing into the water outlet pipeline 1 through the installation of the flow valve in the prior art, which causes excessive pressure after the membrane of the reverse osmosis filter element 32 to generate a large amount of wastewater is avoided, and the water saving device has a good water saving effect.

Further, the pure water pipeline 31 is provided with a high-voltage switch 311, and the high-voltage switch 311 is electrically connected with the control module.

Specifically, when the control module controls the first valve water inlet of the first water saving valve 13 to be closed, the second valve water inlet is opened, and the first valve water outlet is opened, the control module controls the high-voltage switch 311 to be closed, so that the reverse osmosis filter element 32 is stopped working; until the temperature detection device 12 detects that the temperature reaches a preset value, the control module controls the first valve water inlet and the first valve water outlet of the first water saving valve 13 to be opened, the second valve water inlet to be closed, and the control module controls the high-voltage switch 311 to be opened, so that the reverse osmosis filter element 32 is restarted to work.

In this embodiment, by controlling the high-voltage switch 311, when the temperature does not reach the preset temperature, the return pipeline 2 is heated for multiple times to reach the preset temperature, and at this time, the reverse osmosis filter element 32 stops working, so that concentrated water is not generated, and the effect of saving water is achieved.

In some embodiments, the pure water line 31 may be provided with a pure water TDS device 312, the pure water TDS device 312 being located upstream of the high voltage switch 311, the pure water TDS device 312 being for detecting the TDS value of pure water.

The concentrate line 33 may be provided with a flush valve 331. When the reverse osmosis filter element 32 needs to be washed, the high-pressure switch 311 and the washing valve 331 are closed, the booster pump 341 is opened to pump water into the reverse osmosis filter element 32, the reverse osmosis filter element 32 is repeatedly washed, after washing, the washing valve 331 is opened, and the washed concentrated water is discharged, so that the reverse osmosis filter element 32 is washed and maintained, and the service life of the reverse osmosis filter element 32 is prolonged.

The water inlet line 34 may be provided with a water inlet valve 342. A water inlet valve 342 is located upstream of the booster pump 341, the water inlet valve 342 being used to control the opening and closing of the water inlet line 34.

The water inlet line 34 may be provided with a water inlet TDS device 343, the water inlet TDS device 343 being located upstream of the water inlet valve 342, the water inlet TDS device 343 being adapted to detect the TDS value of the water in the water inlet line 34.

Further, the water saving system also comprises a pre-filter element 35 and a raw water pipeline 36;

one end of the raw water pipeline 36 is communicated with a water inlet of the pre-filter element 35, the other end of the raw water pipeline 36 is used for conveying raw water, and a water outlet of the pre-filter element 35 is communicated with the water inlet pipeline 34.

Specifically, the pre-filter 35 may be an activated carbon filter, PP cotton, PPC filter, or the like. No further restrictions are placed on the choice of pre-filter 35.

In some embodiments, the pre-cartridge 35 is a cartridge formed of highly efficient activated carbon.

In this embodiment, the pre-filter 35 is provided to facilitate the preliminary filtration of the raw water, and filter out large particulate matters in the raw water, so that the water flowing into the water inlet pipeline 34 is cleaner, the filtering load of the reverse osmosis filter 32 is reduced, the reverse osmosis filter 32 is effectively protected, and the service life of the reverse osmosis filter 32 is prolonged.

The foregoing disclosure is illustrative of the present utility model and is not to be construed as limiting the scope of the utility model, which is defined by the appended claims.

Claims (10)

1. The utility model provides a water conservation tap which characterized in that: the device comprises a first water-saving valve (13), a second water-saving valve (14), a first pipeline (19), a second pipeline (10) and a third pipeline (20), a return pipeline (2) and a control module;

the first water saving valve (13) is provided with a first valve water inlet, a second valve water inlet and a first valve water outlet; the first valve water inlet is communicated with one end of the first pipeline (19), the first valve water outlet is communicated with one end of the second pipeline (10), the second valve water inlet is communicated with one end of the return pipeline (2), and the other end of the first pipeline (19) is communicated with the pure water pipeline (31);

the second pipeline (10) is provided with an instant heating module (11) and a temperature detection device (12), and the temperature detection device (12) is positioned at the downstream of the instant heating module (11);

the second water-saving valve (14) is provided with a first valve inflow port, a first valve outflow port and a second valve outflow port, the first valve inflow port is communicated with the other end of the second pipeline (10), the first valve outflow port is communicated with the other end of the return pipeline (2), the second valve outflow port is communicated with one end of the third pipeline (20), and the other end of the third pipeline (20) is a pure water outlet (18);

the first pipeline (19) is provided with a first small direct-current pump (15), and the first small direct-current pump (15) is positioned at the upstream of the first water-saving valve (13);

the control module is electrically connected with the instant heating module (11), the temperature detection device (12), the first water-saving valve (13), the second water-saving valve (14) and the first direct-current small pump (15) respectively.

2. The water conservation faucet of claim 1, wherein: the return pipeline (2) is provided with a second small direct-current pump (21), and the second small direct-current pump (21) is electrically connected with the control module.

3. The water conservation faucet of claim 2, wherein: the return line (2) is provided with a first non-return valve (22) for the flow of water from the first valve outlet to the second valve inlet, the first non-return valve (22) being located downstream of the second small direct-flow pump (21).

4. The water conservation faucet of claim 1, wherein: the first pipeline (19) is provided with a second check valve (16) for supplying water to flow from the water inlet end of the first pipeline (19) to the water inlet of the first valve, and the second check valve (16) is positioned between the first direct-current small pump (15) and the first water-saving valve (13).

5. The water conservation faucet of claim 1, wherein: the second pipeline (10) is provided with a flowmeter (17), the flowmeter (17) is located between the first water-saving valve (13) and the instant heating module (11), and the flowmeter (17) is electrically connected with the control module.

6. A water conservation system, characterized by: comprising a water saving tap according to any of claims 1-5.

7. The water conservation system of claim 6, wherein: the water saving system comprises a pure water pipeline (31), wherein the pure water pipeline (31) is communicated with the first pipeline (19).

8. The water conservation system of claim 7, wherein: the water saving system also comprises a reverse osmosis filter element (32), a concentrated water pipeline (33) and a water inlet pipeline (34);

the water inlet pipeline (34) is provided with a booster pump (341), the booster pump (341) is electrically connected with the control module, one end of the water inlet pipeline (34) is communicated with a water inlet of the reverse osmosis filter element (32), and the other end of the water inlet pipeline (34) is used for water inlet;

one end of the concentrated water pipeline (33) is communicated with the wastewater port of the reverse osmosis filter element (32), and the other end of the concentrated water pipeline (33) is used for discharging concentrated water;

one end of the pure water pipeline (31) is communicated with a pure water port of the reverse osmosis filter element (32).

9. The water conservation system of claim 8, wherein: the pure water pipeline (31) is provided with a high-voltage switch (311), and the high-voltage switch (311) is electrically connected with the control module.

10. The water conservation system of claim 9, wherein: the water saving system also comprises a preposed filter element (35) and a raw water pipeline (36);

one end of the raw water pipeline (36) is communicated with a water inlet of the pre-filter element (35), the other end of the raw water pipeline (36) is used for conveying raw water, and a water outlet of the pre-filter element (35) is communicated with the water inlet pipeline (34).