CN213924138U - Water purifier - Google Patents

Abstract

The utility model provides a water purifier, which comprises a main water pipeline communicated with a water inlet and a water outlet, wherein the main water pipeline is provided with a filter element, the water purifier also comprises a water return pipeline, the first end of the water return pipeline is communicated to the main water pipeline between the filter element and the water outlet, the second end of the water return pipeline is communicated to the main water pipeline between the water inlet and the filter element, the water return pipeline is sequentially provided with a water tank and a water return electromagnetic valve in the direction from the first end to the second end, and the water return pipeline between the water tank and the second end or the main water pipeline between the second end and the filter element is provided with a water pump; the water purifier also comprises a liquid level control device, the liquid level control device is electrically connected with the water return electromagnetic valve and the water pump, and the liquid level control device is used for controlling the liquid level in the water tank so as to wash the filter element by utilizing the water in the water tank. The water purifier with the setting can utilize the pure water prepared in the water tank in advance to wash the filter element, and can avoid receiving the pure water with higher TDS when the user takes water next time.

Description

Water purifier

Technical Field

The utility model relates to a technical field of aqueous cleaning specifically, relates to a purifier.

Background

With the pursuit of the public for quality of life, the water quality is getting more attention. The water purifier is more and more popular because the purified water produced by the water purifier is fresher, more sanitary and safer.

The raw water has high TDS (total dissolved solids), and the filter element can block a large amount of ions in the raw water in front of a membrane of the filter element, so that the TDS of the water passing through the filter element meets the standard of direct drinking water.

However, after the water production of the water purifier is completed, a small amount of raw water still remains in the filter element in front of the membrane of the filter element. After a long-time shutdown, ions in the raw water before the membrane diffuse into the purified pure water after the membrane according to the principle that ions diffuse from the high-concentration solution to the low-concentration solution, thereby polluting the purified pure water. When the water is taken next time, the polluted pure water will be mixed with newly prepared pure water and flow out together, so that the TDS of the first section of water taken by the user is higher than the standard value.

SUMMERY OF THE UTILITY MODEL

In order to at least partially solve the problems in the prior art, according to an aspect of the present invention, there is provided a water purifier, comprising a main water pipe communicating a water inlet and a water outlet, the main water pipe being provided with a filter element, the water purifier further comprising a water return pipe, a first end of the water return pipe being connected to the main water pipe between the filter element and the water outlet, a second end of the water return pipe being connected to the main water pipe between the water inlet and the filter element, the water return pipe being sequentially provided with a water tank and a water return solenoid valve in a direction from the first end to the second end, and a water pump being provided on the water return pipe between the water tank and the second end or the main water pipe between the second end and the filter element; the water purifier also comprises a liquid level control device, the liquid level control device is electrically connected with the water return electromagnetic valve and the water pump, and the liquid level control device is used for controlling the liquid level in the water tank so as to wash the filter element by utilizing the water in the water tank.

The water purifier with the arrangement can flush the filter element by using the pure water prepared in the water tank in advance after water taking is finished so as to reduce the raw water stock in the filter element and achieve the effect of pure water bubble membrane. Therefore, when the user takes water next time, the user can avoid receiving the pure water with higher TDS, and the drinking safety is improved. Moreover, the water purifier with the water pump can prevent the water pump from continuously pumping water when no water exists in the water tank or the water level is very low, so that the water pump idles and the service life of the water pump is influenced; can also guarantee that the water tank can store enough water for washing the filter element, guarantee the washing effect of the filter element and further guarantee the water supply quality of the water purifier.

Illustratively, the water purifier also comprises a controller, the controller is electrically connected with the water return electromagnetic valve, the water pump and the liquid level control device and is used for controlling the water return electromagnetic valve and the water pump according to a liquid level control signal from the liquid level control device.

The water purifier with the controller can realize more control modes, so that the functions of the water purifier are increased, and the practicability of the water purifier is improved. And moreover, the controller is used for controlling the water return electromagnetic valve and the water pump based on the liquid level control signal from the liquid level control device, so that the reliability is higher.

Exemplarily, the water purifier further comprises a first one-way valve and a pressure switch which are sequentially arranged on the main water pipeline along the direction from the first end to the water outlet, the pressure switch is also electrically connected with the water return electromagnetic valve and the water pump, and the water tank is an airtight container.

The water purifier with the arrangement can be connected with the mechanical faucet at the water outlet, and the water purifier can be controlled only by opening and closing the mechanical faucet, so that the water purifier is wider in application range.

Exemplarily, the liquid level control device is a liquid level sensor, and the liquid level sensor is arranged on the water tank; or the liquid level control device is a first timer, and the first timer is used for timing flushing of the filter element by using water in the water tank under the triggering of the pressure switch so as to control the water return electromagnetic valve to be stopped and control the water pump to stop working when the flushing reaches a first time threshold value.

The water purifier with the filter element flushing control device can realize the control of filter element flushing in multiple modes, so that the water purifier is wider in application range. Moreover, the water purifier has the advantages of relatively simple structure, easy realization and lower cost.

Illustratively, the water purifier also includes an electrically controlled faucet disposed at the outlet.

The electric control faucet can directly control each device on the water purifier through opening and closing operations, the opening and closing of the faucet do not need to be judged according to the pressure in the pipeline, the arrangement of a pressure switch and the like is reduced, and the integration level of the water purifier is improved.

Illustratively, the level control device includes a high level switch and a low level switch, the high level switch being disposed at a higher position in the tank than the low level switch.

The water purifier with the setting is simple in structure, and the using state of the water purifier can be directly controlled according to the change of the liquid level in the water tank by arranging the high liquid level switch and the low liquid level switch in the water tank.

Illustratively, the liquid level control apparatus includes: the second timer is used for timing the water storage of the water tank under the triggering of the electric control faucet so as to control the conduction of the water return electromagnetic valve and control the work of the water pump when the water storage reaches a second time threshold value; and the third timer is used for timing the flushing of the filter element by using the water in the water tank under the triggering of the second timer so as to control the water return electromagnetic valve to be closed and control the water pump to stop working when the flushing reaches a third time threshold.

The water purifier with the structure can reduce the number of liquid level switches arranged in the water tank, further simplify the structure of the water tank, improve the use space of the water tank, further improve the integration level of the water purifier and reduce the product cost.

Illustratively, a second one-way valve is arranged between the second end of the water return pipeline and the water return electromagnetic valve, and the conduction direction of the second one-way valve is from the water return electromagnetic valve to the second end.

The water purifier with the arrangement can prevent raw water which is not filtered by the filter element from entering the water tank and polluting pure water in the water tank.

Illustratively, a water outlet control device is arranged on the main water pipeline downstream of the first end, a water inlet electromagnetic valve is arranged on the main water pipeline between the water inlet and the second end, and the water outlet control device is electrically connected with the water inlet electromagnetic valve.

The water purifier with the water inlet electromagnetic valve can prevent water flow from continuously flowing into the main water pipeline from the water inlet and then being discharged through the filter element when the water purifier is in standby state, so that the waste water is constantly flowing and the water resource is wasted. On the other hand, when the purifier is in the stage of washing, closing of the water inlet solenoid valve can only make pure water in the water tank enter the main water pipeline to wash the filter element, and secondary pollution of the filter element caused by unfiltered water flow from the water inlet entering the filter element through the water inlet solenoid valve is avoided.

Illustratively, a water outlet control device is arranged on the main water pipeline at the downstream of the first end, the water pump is a booster pump, the filter element is a reverse osmosis filter element, the booster pump is arranged on the main water pipeline between the second end and the reverse osmosis filter element, and the water outlet control device is electrically connected with the booster pump.

The water purifier with the booster pump and the reverse osmosis filter element can improve the efficiency of generating pure water and simultaneously can reduce the TDS value in the pure water to a greater extent. And moreover, the starting and stopping of the booster pump can be controlled by the water outlet control device, so that the booster pump is convenient for users to use.

A series of concepts in a simplified form are introduced in the disclosure, which will be described in further detail in the detailed description section. The summary of the invention is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter.

The advantages and features of the present invention are described in detail below with reference to the accompanying drawings.

Drawings

The following drawings of the present invention are used herein as part of the present invention for understanding the present invention. There are shown in the drawings, embodiments and descriptions thereof, which are used to explain the principles of the invention. In the drawings, there is shown in the drawings,

fig. 1 is a schematic water path diagram of a water purifier according to an exemplary embodiment of the present invention; and

fig. 2 is a schematic water path diagram of a water purifier according to another exemplary embodiment of the present invention.

Wherein the figures include the following reference numerals:

100. 100', a water purifier; 101. a water inlet; 102. a water outlet; 200. a main water line; 210. a filter element; 220. a water pump; 230. a water inlet electromagnetic valve; 240. a first check valve; 250. a pressure switch; 300. a water return pipeline; 301. a first end; 302. a second end; 310. a water tank; 320. a water return electromagnetic valve; 330. a second one-way valve; 400. a liquid level control device.

Detailed Description

In the following description, numerous details are provided to provide a thorough understanding of the present invention. One skilled in the art, however, will understand that the following description illustrates only a preferred embodiment of the invention and that the invention may be practiced without one or more of these details. In addition, some technical features that are well known in the art are not described in detail in order to avoid obscuring the present invention.

As shown in fig. 1, the present invention provides a water purifier 100 having a water inlet 101 and a water outlet 102. Typically, the water inlet 101 may be connected to a source of water such as a municipal water line. A user may take water through the water outlet 102. The water purifier 100 includes a main water line 200 communicating the water inlet 101 and the water outlet 102. The main water line 200 is provided with a filter cartridge 210. The water flowing in from the water inlet 101 is filtered by the filter element 210 to generate pure water, and flows out through the water outlet 102.

The water purifier 100 further comprises a water return line 300. A first end 301 of the return line 300 is connected to the main water line 200 between the filter cartridge 210 and the water outlet 102, and a second end 302 of the return line 300 is connected to the main water line 200 between the water inlet 101 and the filter cartridge 210. The return pipe 300 is provided with a water tank 310 and a return solenoid valve 320 in order in a direction from the first end 301 to the second end 302. It can be understood that the water tank 310 and the water return solenoid valve 320 are connected in parallel to the filter cartridge 210. The water purifier 100 further comprises a water pump 220. The water pump 220 may be disposed on the return line 300 between the water tank 310 and the second end 302, or on the main water line 200 between the second end 302 and the filter cartridge 210. The water tank 310 may store therein pure water prepared in advance. The water pump 220 may be used to pump water from the water tank 310 out of the return line 300 and into the filter cartridge 210 to flush the filter cartridge 210.

The water purifier 100 further comprises a liquid level control device 400. The level control apparatus 400 may be electrically connected to the water return solenoid valve 320 and the water pump 220. The liquid level control apparatus 400 is used to control the liquid level in the water tank 310 to flush the filter cartridge 210 with the water in the water tank 310. The water return solenoid valve 320 and the water pump 220 may be controlled by a liquid level control signal from the liquid level control apparatus 400, and thus, the liquid level in the water tank 310 may be controlled. For example, the liquid level control device 400 may be a liquid level sensor disposed in the water tank 310, and directly detects the liquid level in the water tank 310 to obtain a liquid level control signal. Alternatively, the liquid level control apparatus 400 may also include two flow meters respectively disposed on the return lines 300 at both sides of the water tank 310 to detect the flow rates of water flowing into the water tank 310 and water flowing out of the water tank 310. The condition of the liquid level in the water tank 310 can be indirectly obtained from the flow detection signals output by the two flow meters, and therefore, the flow detection signals can also be called liquid level control signals.

Illustratively, during the water storage phase of the water tank 310, the water return solenoid valve 320 is closed. When the water tank 310 stores water, the water return solenoid valve 320 may be controlled to open and the water pump 220 may be controlled to operate when it is determined that the water tank 310 is full or the liquid level in the water tank 310 reaches a certain high level state according to the flow control signal of the liquid level control device 400, and the filter cartridge 210 is flushed by the water in the water tank 310. When it is determined that the water in the water tank 310 is used for flushing the filter cartridge 210 or the liquid level in the water tank 310 reaches a certain lower liquid level state according to the flow control signal of the liquid level control device 400, the water return solenoid valve 320 may be controlled to be closed, and the water pump 220 may be controlled to stop working, complete flushing and prepare for the next water storage of the water tank 310. Wherein the filter element 210 is flushed after the user has finished taking water. The water can be immediately washed after the water intake is finished, or the water can be washed after a period of time after the water intake is finished.

Therefore, the water purifier 100 having this configuration can flush the filter element 210 with the pure water prepared in advance in the water tank 310 after the water intake is completed, thereby reducing the raw water level in the filter element 210 and achieving the function of a pure water bubble membrane. Therefore, when the user takes water next time, the user can avoid receiving the pure water with higher TDS, and the drinking safety is improved. Moreover, the water purifier 100 can prevent the water pump 220 from continuing to pump water when no water is in the water tank 310 or the water level is very low, so that the water pump 220 idles and the service life of the water pump 220 is influenced; it can also be ensured that sufficient water can be stored in the water tank 310 to flush the filter element 210, thereby ensuring the flushing effect on the filter element 210 and further ensuring the water supply quality of the water purifier 100.

Illustratively, an outlet control device is disposed on the main water line 200 downstream of the first end 301 of the return line 300. The water outlet control device can be a mechanical faucet, an electric control faucet, a pipeline machine and the like. The user can take water from the water outlet 102 through the water outlet control device. A water inlet solenoid valve 230 is provided on the main water line 200 between the water inlet 101 and the second end 302 of the return water line 300. The water inlet solenoid valve 230 can be regarded as a main valve of the water purifier 100, and when the water purifier 100 is in a standby state or a flushing stage, the water inlet solenoid valve 230 is closed; during the water intake phase of the user or the water storage phase of the water tank 310 of the water purifier 100, the water inlet solenoid valve 230 is turned on. The water outlet control device is electrically connected with the water inlet electromagnetic valve 230. When a user starts to take water, the water outlet control device is opened or triggered, the water inlet electromagnetic valve 230 is turned on, the main water pipeline 200 of the water purifier 100 is communicated, and the user can take pure water at the water outlet 102. When the user stops getting water or purifier 100 enters the flush phase, the water outlet control is turned off or triggered again, and inlet solenoid valve 230 may be turned off to turn off the flow of water into main water line 200.

Therefore, the water purifier 100 with the water inlet solenoid valve 230 can prevent the water from constantly flowing into the main water pipeline 200 through the water inlet 101 and then being discharged through the filter element 210 when the water purifier 100 is in a standby state, so that the waste water normally flows and the water resource is wasted. On the other hand, when the water purifier 100 is in the flushing stage, the water inlet solenoid valve 230 is closed, so that only pure water in the water tank 310 enters the main water pipeline 200 to flush the filter element 210, thereby preventing unfiltered water from the water inlet 101 from entering the filter element 210 through the water inlet solenoid valve 230 and causing secondary pollution to the filter element 210.

In another embodiment, a water outlet control device, which may be the same as described above, is provided on the main water line 200 downstream of the first end 301. Wherein, the water pump 220 is a booster pump, and the filter element 210 is a reverse osmosis filter element. The booster pump is arranged on the main water pipeline 200 between the second end 302 and the reverse osmosis filter element, and the water outlet control device is electrically connected with the booster pump.

Therefore, the water purifier with the booster pump and the reverse osmosis filter element can improve the efficiency of generating pure water and can reduce the TDS value in the pure water to a greater extent. And moreover, the starting and stopping of the booster pump can be controlled by the water outlet control device, so that the booster pump is convenient for users to use.

Illustratively, water purifier 100 may also include a controller. The controller may be electrically connected to the water return solenoid valve 320, the water pump 220, and the level control apparatus 400. The controller may be used to control the water return solenoid valve 320 and the water pump 220 based on the level control signal from the level control apparatus 400. For example, the operation principle may be that after the user stops taking water, the water purifier 100 may enter the water storage stage of the water tank 310, and the water return solenoid valve 320 is in the off state. Pure water filtered by the filter cartridge 210 enters the water tank 310, and the liquid level in the water tank 310 gradually rises. When the controller receives a liquid level control signal indicating that the water tank 310 is full generated by the liquid level control device, the water return solenoid valve 320 is controlled to be turned on, the water pump 220 is started or kept in a working state, and the water purifier 100 enters a flushing stage, which is also the same as the above. When water purifier 100 is in the flushing phase, pure water in tank 310 will flow out through filter element 210, and the liquid level therein gradually decreases. When the controller receives the signal generated by the liquid level control device and indicates that the water tank 310 is in a low liquid level state, the water return solenoid valve 320 is controlled to be closed, the water pump 220 is controlled to stop working, and the flushing stage is ended.

The controller can be built by adopting electronic elements such as a comparator, a register, a digital logic circuit and the like, or can be realized by adopting processor chips such as a singlechip, a microprocessor, a Programmable Logic Controller (PLC), a Digital Signal Processor (DSP), a Field Programmable Gate Array (FPGA), a Programmable Logic Array (PLA), an Application Specific Integrated Circuit (ASIC) and the like and peripheral circuits thereof.

The water purifier 100 with the controller can realize more control modes, so that the functions of the water purifier 100 are increased, and the practicability of the water purifier 100 is improved. And moreover, the controller is used for controlling the water return electromagnetic valve and the water pump based on the liquid level control signal from the liquid level control device, so that the reliability is higher.

For the water purifier 100 with the water outlet control device, the water inlet electromagnetic valve 230 and/or the booster pump, the controller may be electrically connected to the three. In other words, the water outlet control device may be electrically connected to the water inlet solenoid valve 230 and/or the booster pump via the controller. The controller controls the water inlet electromagnetic valve 230 and/or the booster pump by the water outlet control device.

Illustratively, the water purifier 100 further comprises a first check valve 240 and a pressure switch 250, which are sequentially arranged on the main water pipeline 200 along the direction from the first end 301 to the water outlet 102. The pressure switch 250 is also electrically connected to the water return solenoid valve 320 and the water pump 220. It will be appreciated that in this example, the pressure switch 250 acts as the aforementioned water outlet control. In the water purifier with the controller, the pressure switch 250 is electrically connected with the water return solenoid valve 320 and the water pump 220 through the controller. The water tank 310 is an airtight container, that is, the water tank 310 container communicates with the outside only through a pipe communicating with the return pipe 300, and cannot communicate with the atmosphere or the like through other pores.

Illustratively, when a user uses the water purifier 100 to take water, the faucet is opened, the pressure in the pipeline where the pressure switch 250 is located is reduced, the pressure switch 250 is turned on, and the water pump 220 is controlled to be started. After the user closes the faucet, the pure water prepared by the filter element 210 flows into the water tank 310 through the water return pipe 300, and after the water tank 310 is full, the pressure switch 250 is turned off by the pressure generated in the pipe, and the water intake and storage stage of the water purifier 100 is finished. Based on the electrical signal from the pressure switch 250 being open, the water purifier 100 can be controlled to enter the flushing phase. In the flushing phase, the water return solenoid valve 320 is switched on. The turning off of the pressure switch 250 may not control the stopping of the water pump 220, in which case the water pump 220 may pump pure water from the water tank 310 into the main water line 200 during the flushing phase to flush the filter cartridge 210. When the liquid level control device 400 detects that the water in the water tank 310 is insufficient or the water in the water tank 310 is in a low liquid level state, an electrical signal is sent, the water return electromagnetic valve 320 is controlled to be stopped by the electrical signal, the water pump 220 stops working, and the water purifier 100 enters a standby state.

Therefore, the water purifier 100 with the arrangement can be connected with a mechanical faucet at the water outlet 102, and the water purifier 100 can be controlled only by opening and closing the mechanical faucet, so that the water purifier 100 has a wider application range.

Further, in one embodiment, the fluid level control device 400 is a fluid level sensor. The level sensor is disposed on the water tank 310. The level sensor may comprise a level switch. For example, the level switch may include a low level switch disposed at a lower position within the water tank 310. The level switch is triggered when the water in the tank 310 is insufficient or reaches a low level.

In another embodiment, the fluid level control apparatus 400 may also be a first timer. The first timer is used to time the flushing of the cartridge 210 with water from the tank 310 upon the activation of the pressure switch 250. In other words, since the displacement of the water pump 220 is a constant value, the water level within the water tank 310 may be controlled by a time threshold. In the aforementioned example including the controller, the first timer may be integrated with the controller in one chip or on one circuit board.

When the liquid level in the water tank 310 triggers a liquid level switch or when the flushing reaches a first time threshold value, it is determined that the flushing stage is finished, the water return solenoid valve 320 is controlled to be cut off, the water pump 220 is controlled to stop working, and the water purifier 100 enters a standby state.

Therefore, the water purifier 100 with the arrangement can realize the control of the flushing of the filter element 210 in various ways, so that the water purifier 100 has a wider application range. Moreover, the water purifier has the advantages of relatively simple structure, easy realization and lower cost.

Exemplarily, referring to fig. 2, the water purifier 100' further comprises an electrically controlled faucet provided at the water outlet 102. It will be appreciated that in this example, an electrically controlled faucet may be used as the aforementioned water egress control device. The electric control faucet can directly control each device on the water purifier 100' through opening and closing operations, and does not need to judge the opening and closing of the faucet according to the pressure in a pipeline, so that the arrangement of a pressure switch 250 and the like is reduced, and the integration level of the water purifier is improved.

Illustratively, the fluid level control apparatus 400 may include a high level switch and a low level switch. The high level switch is disposed at a higher position in the tank than the low level switch. As shown in FIG. 2, two small rectangular boxes of the fluid level control apparatus 400 are shown, with the upper showing a high level switch and the lower showing a low level switch. After the user closes the electrically controlled faucet, the water purifier may not directly enter the flushing stage, but the water return solenoid valve 320 is turned on when the water pump 220 stores the water in the water tank 310 to the high level switch, so that the water purifier 100' enters the flushing stage. When the liquid level in the water tank 310 drops to the low level switch, the flushing stage is ended, the water pump 220 stops working, the water return solenoid valve 320 is closed, the water purifier 100' enters a standby state, and the user waits for the next time to open the faucet for taking water.

Accordingly, the water purifier 100 'having this configuration is simple in structure, and the high level switch and the low level switch are provided in the water tank 310, so that the use state of the water purifier 100' can be directly controlled according to the change in the liquid level in the water tank 310.

In another embodiment, the fluid level control apparatus 400 may include a second timer and a third timer. The second timer is used for timing the water storage of the water tank 310 under the triggering of the electric control faucet so as to control the conduction of the water return electromagnetic valve 320 and control the operation of the water pump 220 when the water storage reaches a second time threshold value. The third timer is used for timing the flushing of the filter element 210 by the water in the water tank 310 under the triggering of the second timer, so as to control the water return solenoid valve 320 to close and control the water pump 220 to stop working when the flushing reaches a third time threshold. That is, the liquid level in the water tank 310 is indirectly controlled by the second timer and the third timer. The second timer and the third timer may also be integrated with the controller. Optionally, the second timer is used to start timing after the electrically controlled faucet is turned off, and at this time, the water pump 220 stores water into the water tank 310 until the water purifier 100' completes the water storage into the water tank 310 after the second time threshold is reached. The flush phase may be entered immediately after the act of storing water into the tank 310 is completed, or may be entered some time after the act of storing water into the tank 310 is completed. When the water purifier 100' enters the flushing stage, the third timer starts to time, the water return solenoid valve 320 is turned on, the water pump 220 can pump the water in the water tank 310 to flush the filter element 210, and the flushing time is controlled by the third time threshold.

Therefore, the water purifier 100 'with the structure can reduce the arrangement of a liquid level switch in the water tank 310, further simplify the structure of the water tank 310, improve the use space of the water tank 310, further improve the integration level of the water purifier 100', and reduce the product cost.

It will be appreciated that in the above described embodiments, the level control means is implemented using two level switches and two timers, respectively. Alternatively, the level control means may be implemented by a combination of a level switch and a timer. For example, the liquid level control device may include the low level switch and a second timer, or the high level switch and a third timer. Alternatively, the liquid level control device may be a liquid level detection device based on infrared reflection or the like, which can detect the liquid level in the water tank 310 in a quasi-real time manner. Alternatively still, as mentioned above, the level control means may also be implemented by means other than a level switch or a timer, such as a flow meter.

Illustratively, a second check valve 330 is disposed between the second end 302 of the water return line 300 and the water return solenoid valve 320, and the conducting direction of the second check valve 330 is the direction from the water return solenoid valve 320 to the second end 302. That is, the water in the water tank 310 can only flow into the main water pipe 200 from the return pipe 300 through the second end 302, but not flow into the water tank 310 from the main water pipe 200 through the second end 302. Therefore, the water purifier 100 with the above arrangement can prevent raw water that is not filtered by the filter element 210 from entering the water tank 310 and polluting pure water in the water tank 310.

In the description of the present invention, it is to be understood that the orientation or positional relationship indicated by the orientation words such as "front", "rear", "upper", "lower", "left", "right", "horizontal", "vertical", "horizontal" and "top", "bottom", etc. are usually based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of description, and in the case of not making a contrary explanation, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore, should not be interpreted as limiting the scope of the present invention; the terms "inner" and "outer" refer to the interior and exterior relative to the contours of the components themselves.

Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe the spatial relationship of one or more components or features shown in the figures to other components or features. It is to be understood that the spatially relative terms are intended to encompass not only the orientation of the component as depicted in the figures, but also different orientations of the component in use or operation. For example, if an element in the drawings is turned over in its entirety, the articles "over" or "on" other elements or features will include the articles "under" or "beneath" the other elements or features. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". Further, these components or features may also be positioned at various other angles (e.g., rotated 90 degrees or other angles), all of which are intended to be encompassed herein.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, elements, components, and/or combinations thereof, unless the context clearly indicates otherwise.

It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein.

The present invention has been described in terms of the above embodiments, but it is to be understood that the above embodiments are for purposes of illustration and description only and are not intended to limit the invention to the described embodiments. Furthermore, it will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that many more modifications and variations are possible in light of the teaching of the present invention and are within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (10)

1. A water purifier comprises a main water pipeline communicated with a water inlet and a water outlet, the main water pipeline is provided with a filter element, and the water purifier is characterized in that,

the water purifier also comprises a water return pipeline, wherein a first end of the water return pipeline is communicated to a main water pipeline between the filter element and the water outlet, a second end of the water return pipeline is communicated to the main water pipeline between the water inlet and the filter element, a water tank and a water return electromagnetic valve are sequentially arranged on the water return pipeline along the direction from the first end to the second end, and a water pump is arranged on the water return pipeline between the water tank and the second end or the main water pipeline between the second end and the filter element;

the water purifier also comprises a liquid level control device, the liquid level control device is electrically connected with the water return electromagnetic valve and the water pump, and the liquid level control device is used for controlling the liquid level in the water tank so as to utilize the water in the water tank to flush the filter element.

2. The water purifier of claim 1,

the water purifier also comprises a controller, wherein the controller is electrically connected with the water return electromagnetic valve, the water pump and the liquid level control device and is used for controlling the water return electromagnetic valve and the water pump according to a liquid level control signal from the liquid level control device.

3. The water purifier as recited in claim 1 or 2, further comprising a first one-way valve and a pressure switch sequentially disposed along a direction from said first end to said water outlet on said main water pipe, said pressure switch being electrically connected to said water return solenoid valve and said water pump, said water tank being an airtight container.

4. The water purifier of claim 3,

the liquid level control device is a liquid level sensor which is arranged on the water tank; or

The liquid level control device is a first timer, and the first timer is used for timing flushing of the filter element by using water in the water tank under the triggering of the pressure switch so as to control the water return electromagnetic valve to be stopped and control the water pump to stop working when the flushing reaches a first time threshold value.

5. The water purification machine of claim 1 or 2, further comprising an electrically controlled faucet disposed at the water outlet.

6. The water purifier of claim 5, wherein the level control device comprises a high level switch and a low level switch, the high level switch being disposed at a higher position in the tank than the low level switch.

7. The water purifier of claim 5, wherein the liquid level control device comprises:

the second timer is used for timing the water stored in the water tank under the triggering of the electric control faucet so as to control the return water electromagnetic valve to be conducted and control the water pump to work when the stored water reaches a second time threshold; and

and the third timer is used for timing the flushing of the filter element by using the water in the water tank under the triggering of the second timer so as to control the water return electromagnetic valve to be closed and control the water pump to stop working when the flushing reaches a third time threshold.

8. The water purifier as recited in claim 1 or 2, wherein a second one-way valve is disposed between a second end of said water return pipeline and a water return solenoid valve, and a direction of conduction of said second one-way valve is from said water return solenoid valve to said second end.

9. The water purifier as recited in claim 1 or 2, wherein a water outlet control device is disposed on the main water pipe downstream of said first end, a water inlet solenoid valve is disposed on the main water pipe between said water inlet and said second end, and said water outlet control device is electrically connected to said water inlet solenoid valve.

10. The water purifier as recited in claim 1 or 2, wherein a water outlet control device is disposed on the main water line downstream of said first end, said water pump is a booster pump, said filter element is a reverse osmosis filter element, said booster pump is disposed on the main water line between said second end and said reverse osmosis filter element, and said water outlet control device is electrically connected to said booster pump.

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