WO2017088273A1

WO2017088273A1 - Reverse-osmosis water purifier and water preparation method using same

Info

Publication number: WO2017088273A1
Application number: PCT/CN2016/000020
Authority: WO
Inventors: 陈耀波; 王二林
Original assignee: 陈耀波
Priority date: 2015-11-27
Filing date: 2016-01-13
Publication date: 2017-06-01
Also published as: CN105344245A

Abstract

Disclosed is a reverse-osmosis water purifier, comprising a water storage barrel (10), a reverse osmosis membrane unit (14), a water path switching valve (7) and a purified water faucet (5), wherein the water path switching valve (7) comprises a first connector (1), a second connector (2) and a third connector (3); the water path switching valve (7) can be switched to make the first connector (1) be in communication with the third connector (3) or switched to make the second connector (2) be in communication with the third connector (3); a concentrated water outlet of the reverse osmosis membrane unit (14) is branched into a first branch (161) and a second branch (162); the first branch (161) is in communication with the first connector (1); a concentrated water nozzle of the water storage barrel (10) is in communication with the third connector (3); a first control valve (18) is connected with the second branch (162) in series, and the second connector (2) is in communication with the water drainage of the second branch (162).

Description

Reverse osmosis pure water machine and water production method using the same

Technical field

The invention relates to a water making device, in particular to a reverse osmosis pure water machine and a water making method using the pure water machine.

Background technique

With the improvement of people's living standards and the awareness of drinking water safety, the requirements for drinking water quality are getting higher and higher. Various pure water machines have appeared on the market, but most of the existing pure water machines need to be powered on to control the pure water mechanism water. The use of the power supply not only limits the use of the water purifier, but also increases the production cost and the cost of the product. To this end, people have designed an electroless water purifier. For example, the Chinese Patent Licensing Bulletin No. CN202988859U, "An Electroless Nanofiltration or RO Membrane Water Purifier," discloses such a pure water machine, which includes Pressure water storage tank, four-sided valve or three-sided valve, pre-filter, nano filter or RO filter, rear filter and pure faucet, the pure water machine uses the water pressure in the pressure storage tank after the water is made to the four-sided valve or the three-sided valve The on-off control is carried out to automatically cut off the tap water into the water when the pressure storage tank is full of water, thereby controlling the water production of the pure water machine.

Obviously, this pure water machine that does not need electricity can significantly reduce the production cost and the use cost, and achieve the purpose of safety and energy conservation. However, the four-sided valve or the three-sided valve used in the existing pure water machine is not reliable, and as the tap water pressure fluctuates, there is often a problem of long-flowing wastewater. At the same time, the pressure storage bucket used is unreasonable due to the incomplete drainage. Due to the existence of gas pressure, the actual volume of the storage bucket is only half or less; and with the continuous production of pure water, the storage tank The pressure will continue to rise. At this time, the water storage bucket must bear a certain pressure. This requires the pressure barrel to have better sealing performance and higher strength. Otherwise, the sealing performance will be poor, and the water will not appear. The increase in strength will inevitably increase the production cost. In addition, this water purifier requires manual flushing, and once the flush is forgotten, the system life will be greatly reduced. Therefore, this type of pure water machine has not been well marketed so far.

Summary of the invention

The first technical problem to be solved by the present invention is to provide a non-electricity and use pure water while flushing the reverse osmosis membrane at a large flow rate, and almost no pressure at the pure water end of the reverse osmosis membrane. Reverse osmosis pure water machine.

The second technical problem to be solved by the present invention is to provide a non-electric and pure water, while flushing the reverse osmosis membrane at a large flow rate, and having almost no pressure at the pure water end of the reverse osmosis membrane. Water production method for reverse osmosis pure water machine.

The technical solution adopted by the present invention to solve the above first technical problem is: the reverse osmosis pure water machine includes a water storage bucket And a reverse osmosis membrane device, wherein the reverse osmosis membrane device is provided with a water inlet, a pure water outlet and a concentrated water outlet, the water storage tank has a pure water outlet and a concentrated water outlet, and the pure water outlet of the reverse osmosis membrane device The pure water port of the water storage tank is connected, and the inside of the water storage tank is partitioned by a diaphragm into a first chamber for storing pure water and a second chamber for storing concentrated water, characterized in that: the water path is further included a switching valve and a pure water outlet for communicating with the pure water port of the water storage tank, the water switching valve includes a first interface, a second interface, and a third interface, and the water switching valve can be switched to the first The interface is connected to the third interface or is connected to the second interface and is connected to the third interface, and the concentrated water outlet of the reverse osmosis membrane device branches into a first branch and a second branch, and the first branch and the branch The first interface is connected, the concentrated water port of the water storage tank is connected to the third interface, and the first control valve capable of closing the concentrated water discharge in the state where the water storage tank is filled with pure water is connected in series on the second branch road The second interface and the drainage phase of the second branch Pass.

Preferably, the pure water outlet nozzle is integrated with the waterway switching valve to form a four-tube faucet, that is, a fourth interface is added to the waterway switching valve at this time, and the pure water outlet nozzle is switched with the waterway valve spool. The action makes the pure water outlet communicate with the fourth interface (when using pure water) or phase cut (without pure water), so that bacteria and other debris can be prevented from entering the pure water outlet without using pure water. Into the first chamber of the water tank, it is ensured that the pure water is not contaminated, and such a structure does not require additional operations and the structure is more compact. It also avoids a slight pressure on the first chamber, causing water droplets to appear in the pure water outlet.

Of course, since the first chamber has no pressure, the pure water outlet nozzle and the waterway switching valve may be separately arranged, such as directly installed between the pure water outlet of the reverse osmosis membrane device and the pure water outlet of the water storage tank. The piping makes the installation of the pure water spout more flexible.

In order to open or reliably close the pure water spout, an on-off valve is installed on the water path between the pure water spout and the pure water port of the water storage tank.

Further preferably, in the water path between the pure water outlet of the reverse osmosis membrane device and the pure water port of the water storage tank, pure water that allows only the outflow from the reverse osmosis membrane device is allowed to flow into the water storage tank and the pure water outlet water. The first check valve of the mouth.

Further preferably, the water path between the pure water outlet of the reverse osmosis membrane device and the pure water port of the water storage tank is connected in series to prevent the outflow from the reverse osmosis membrane device in a state where the pure water of the storage tank is full. Pure water flows into the second control valve of the water storage tank.

The first control valve and the second control valve may take a variety of configurations. Preferably, the first control valve and the second control valve are mechanical valves integrated on the water reservoir and driven by the diaphragm. Of course, the first control valve and the second control valve may also be magnetic valves or piston valves without spring force.

Further preferably, a second one-way valve that allows only water to be discharged from the second port is connected in series on the water path between the second port and the drain port.

Further preferably, a throttle valve is also connected in series on the second branch. And the throttle valve can regulate the flow of concentrated water flowing through the second branch.

Preferably, in any of the above aspects, the water purifier further includes a concentrated water outlet for communicating with the first interface of the water switching valve.

In order to perform preliminary filtration of the water flowing into the water inlet of the reverse osmosis membrane device, a pretreatment filter element is installed on the inlet pipe at the front end of the reverse osmosis membrane device.

In order to improve the taste of the pure water, a taste filter element is serially connected to the pipeline between the pure water outlet of the water storage tank and the pure water outlet.

The technical solution adopted by the present invention to solve the above second technical problem is: a water production method using the reverse osmosis pure water machine, characterized in that:

When pure water is used, the water switching valve is switched to connect the first interface and the third interface, the pure water outlet is connected to the pure water port of the water storage tank, the second interface is closed, and the water inlet is closed from the reverse osmosis membrane device. The inflowing water passes through the reverse osmosis membrane device and flows out through the concentrated water outlet, and then flows into the first branch of the concentrated water outlet, and the concentrated water flowing out from the first branch flows into the storage tank through the first interface and the third interface. In the nozzle, the concentrated water in the water storage bucket squeezes the pure water out of the water storage bucket, and the squeezed pure water flows to the pure water outlet nozzle;

When the pure water is stopped, the water switching valve is switched to close the first interface, the second interface is connected to the third interface, and the pure water flowing out of the pure water outlet of the reverse osmosis membrane device flows into the water storage tank, and the pure water in the water storage tank The concentrated water is pushed out from the water storage tank, and the concentrated concentrated water flows into the third port and the second port of the water passage switching valve in sequence and is discharged through the drain port.

Compared with the prior art, the invention has the advantages that the reverse osmosis pure water machine and the water production method can not only realize safe and safe operation, but also save energy, safety and reliability, and can overcome the traditional reverse osmosis pure water machine. The pure water outlet has pressure defects, which is more in line with the reverse osmosis membrane requirement. There is no back pressure filtration principle. When pure water is used, the reverse osmosis membrane can be flushed at a large flow rate, and the water storage tank can be regarded as no pressure and can be filled with pure water.

DRAWINGS

1 is a schematic structural view of Embodiment 1 of the present invention;

2 is a schematic structural view of Embodiment 2 of the present invention;

3 is a schematic structural view of Embodiment 3 of the present invention;

4 is a schematic structural view of Embodiment 4 of the present invention;

Figure 5 is a schematic structural view of Embodiment 5 of the present invention;

6 is a schematic structural view of Embodiment 6 of the present invention;

7 is a schematic structural view of a water outlet switching valve and a pure water outlet nozzle in an open state of a pure water outlet nozzle according to Embodiment 6 of the present invention;

Figure 8 is a schematic view showing the structure of the pure water spout in the closed state of Figure 7;

FIG. 9 is a schematic structural diagram of Embodiment 7 of the present invention.

detailed description

The invention will be further described in detail below with reference to the embodiments of the drawings.

Embodiment 1:

As shown in FIG. 1, the reverse osmosis pure water machine includes a pretreatment filter 13, a reverse osmosis membrane device 14, a water storage tank 10, a water passage switching valve 7, and a pure water outlet nozzle 5. The pretreatment filter element 13 and the reverse osmosis membrane device 14 are sequentially connected in series to the inlet pipe 12, and the reverse osmosis membrane device 14 is provided with a water inlet, a pure water outlet and a concentrated water outlet. The inside of the water storage tank 10 is partitioned by a diaphragm 11 into a first chamber for storing pure water and a second chamber for storing concentrated water. The first chamber is provided with a pure water port, and the second chamber is opened. Concentrated water. The pure water outlet 5 communicates with the pure water port of the water storage tank 10, and the taste filter 22 is installed on the pipeline between the pure water outlet of the water storage tank 10 and the pure water discharge nozzle 5. After the taste filter 22 is installed, the pure water can be improved. Taste. The mouth filter 22 can be selected from conventional filter elements.

The concentrated water outlet of the reverse osmosis membrane device 14 is connected to the concentrated water discharge pipe 16 and branched into a first branch 161 and a second branch 162. The first branch 161 is used to communicate with the water passage switching valve 7, and the second branch 162 The water outlet end forms a drain port 17, and a throttle valve 19 and a first control valve 18 are connected in series on the second branch path 162. The first control valve is automatically closed when the water storage tank 10 is filled with pure water, thereby closing the concentrated water discharge, that is, the concentrated water flowing out from the concentrated water outlet of the reverse osmosis membrane device 14 is prevented from being discharged through the drain port 17, and the throttle valve can perform flow adjustment. .

The pure water outlet of the reverse osmosis membrane device 14 communicates with the pure water port of the water storage tank 10 through the clean water pipe 15, and the first check valve 20 and the second control valve 21 are connected in series to the clean water pipe 15. The first check valve 20 allows only the pure water flowing out of the reverse osmosis membrane device 14 to flow into the water storage tank 10 and the pure water outlet nozzle 5, and the second control valve 21 is automatically closed in a state where the water storage tank 10 is filled with pure water, thereby The pure water flowing out of the pure water outlet of the reverse osmosis membrane device 14 is prevented from flowing into the pure water port of the water storage tank 10.

In this embodiment, the waterway switching valve 7 includes a first interface 1, a second interface 2, and a third interface 3. The first interface 1 is in communication with the concentrated water outlet of the reverse osmosis membrane device 14; the second interface 2 is in communication with the drain port 17, and the water passage between the second interface 2 and the drain port 17 is serially connected only from the second The second one-way valve 9 is connected to the outlet port; the third port 3 is connected to the concentrated water port of the water storage tank 10. The waterway switching valve 7 can be switched to the first interface 1 to communicate with the third interface 3 or to the second interface 2 to communicate with the third interface 3, as needed.

In the present embodiment, the pure water spout 5 and the waterway switching valve 7 are separately provided. Specifically, the pure water spout 5 is directly installed at the pure water outlet of the reverse osmosis membrane device 14 and the pure water port of the water storage tank 10. The piping between the pipes makes the installation of the pure water nozzle 5 more flexible.

The first control valve 18 and the second control valve 21 in this embodiment are mechanical valves that are integrated on the water storage tank 10 and are driven by the diaphragm 11. Specifically, the first control valve 18 and the second control valve 21 are reset by the spring 181, and both ends of the spring 181 abut against the inner wall of the water storage tank 10 and the floating block 182, and the floating block 182 and the valve stem 183 of the first control valve 18 Connected, the diaphragm 11 drives the float block 182 to move up and down, and in turn opens or closes the first control valve 18 and the second control valve 21.

The water production method of the reverse osmosis pure water machine is as follows:

When pure water is used, the water passage switching valve 7 is switched to connect the first port 1 to the third port 3 and the second port 2 is closed, and the water flowing in from the inlet of the reverse osmosis membrane device 14 passes through the reverse osmosis membrane device 14 and passes through the rich The water outlet flows out, and further flows into the first branch 161 of the concentrated water outlet, and the concentrated water flowing out from the first branch 161 passes through the first interface 1 and The third port 3 flows into the concentrated water port of the water storage tank 10, and the concentrated water in the water storage tank 10 squeezes the pure water out of the water storage tank 10, and is squeezed because the pure water water outlet nozzle 5 communicates with the pure water port of the water storage tank 10. The pure water flows to the pure water outlet 5; it can be seen that the reverse osmosis membrane can be flushed at a large flow rate while using pure water.

When the use of the pure water is stopped, the water passage switching valve 7 is switched to close the first port 1 and the second port 2 is communicated with the third port 3, and the pure water flowing out of the pure water outlet of the reverse osmosis membrane device 14 flows into the water storage tank 10. The pure water in the water storage tank 10 presses the concentrated water from the inside of the water storage tank 10, and the pressurized concentrated water flows into the third port 3 and the second port 2 of the water path switching valve 7 in sequence, and is discharged through the water discharge port 17.

From the above water production process, it can be known that in a place with a high water pressure or a pure water machine using an ultra-low pressure permeable membrane, the faucet can completely replace various control valves, so that the reverse osmosis pure water machine can be operated without electricity and safely, in addition, At the same time, the faucet realizes the opening and closing of the pure water and concentrated water of the reverse osmosis pure water machine, avoiding the unsafe use of the electronic control, and avoiding the long-flowing of the waste water of the ordinary non-electric pure water machine using the four-sided valve, and avoiding The unscientific and cumbersome manual flushing of ordinary electroless reverse osmosis pure water machine.

The water production method using the pure water machine has the following advantages;

1. Overcome the pressure defect of the pure water outlet end of the traditional reverse osmosis pure water machine, and it is more in line with the filtration principle that the reverse osmosis membrane requires no back pressure.

2. Overcoming the defect that the traditional electroless reverse osmosis machine needs to be unable to flush the reverse osmosis membrane at a large flow rate, and the reverse osmosis membrane can be flushed at a large flow rate while using pure water, which is larger than the conventional flushing flow of the electric pure water purifier.

3. The whole system has no electricity, saving energy, safety and reliability.

4. The shortcomings of the traditional electroless reverse osmosis pure water machine using the four-sided valve are avoided. The water storage tank of the pure water machine can be regarded as no pressure, and the pure water end of the reverse osmosis membrane has almost no pressure, and the water storage tank can be filled with pure water.

Embodiment 2:

As shown in Fig. 2, in the water purifier of this embodiment, an on-off valve 8 is attached to the water path between the pure water nozzle 5 and the pure water port of the water storage tank 10. After the switching valve 8 is set, the pure water spout 5 can be opened or reliably closed. The other structures of this embodiment are the same as those of the water purifier in the first embodiment, and are not described herein again.

Embodiment 3;

As shown in Fig. 3, in the water purifier of the present embodiment, the pure water spout 5 is integrated with the water passage switching valve 7 to constitute a four-pipe faucet a. The four-pipe faucet a is provided with a fourth interface 4, and the waterway switching valve 7 and the pure water nozzle 5 are independently controlled, and the pure water nozzle 5 can be connected with the fourth interface 4 (when using pure water) or phase cutting (not used) In the pure water state, so that in the absence of pure water, bacteria and other impurities are prevented from entering the first chamber of the water storage tank 10 through the pure water outlet nozzle 5, ensuring that the pure water is not contaminated, and such structure does not require additional operations. The structure is also more compact. Moreover, the slight water pressure of the first chamber is also avoided, causing water droplets to appear in the pure water outlet nozzle 5. The other structures of this embodiment are the same as those of the water purifier in the first embodiment, and are not described herein again.

Embodiment 4:

As shown in FIG. 4, in the pure water machine of the embodiment, the pure water nozzle 5 and the waterway switching valve 7 are integrated to form a four-tube faucet b, and the four-tube faucet a is provided with a fourth interface 4, pure water effluent The mouth 5 is directly connected to the fourth interface 4, and the rest of the structure is the same as that of the pure water machine in the third embodiment, and details are not described herein again.

Embodiment 5;

As shown in FIG. 5, in the water purifier of this embodiment, the waterway switching valve 7 and the pure water nozzle 5 of the four-tube faucet c used in the embodiment are integrally controlled by the same on-off valve, and the pure water machine is additionally controlled. Also included is a concentrated water spout 6 that communicates with the first port 1 of the water circuit switching valve 7, and the opening and closing of the concentrated water spout 6 is controlled by another independent on-off valve. The rest of the structure in this embodiment is the same as that of the water purifier in the fourth embodiment, and details are not described herein again.

Example 6:

As shown in FIG. 6, in the water purifier of this embodiment, the waterway switching valve 7 and the pure water nozzle 5 of the four-tube faucet d used in the present embodiment are integrally controlled by the same on-off valve. For the structure of the specific four-tube faucet d, please refer to FIG. 7 and FIG. 8. The four-tube faucet d includes a main body d1, an on-off valve d2 mounted on the main body d1, a water purifying nozzle 5, a first interface 1, and a second interface 2. The third interface 3 and the fourth interface 4 are arranged in a vertical direction and are located below the clean water nozzle 5 for connecting the corresponding pipelines. The main body d1 is further provided with a fifth interface 51, and the water is discharged. The mouth 5 is connected to the fifth interface 51, and the switch valve d2 is used to switch the opening and closing state of each interface of the four-tube faucet d.

As shown in FIG. 7, the switch valve d2 is provided with a first passage d21 and a second passage d22. With the rotation of the switch valve d2, the first passage d21 can communicate with the first interface 1 and the third interface 3, or The second interface 2 and the third interface 3 are connected; the second channel d22 can communicate with the fourth interface 4 and the fifth interface 51. That is, when the switching valve d2 switches the clean water nozzle 5 to the open state, the first port 1 communicates with the third port 3, the second port 2 is closed, and the fourth port 4 communicates with the clean water nozzle 5.

As shown in FIG. 8, when the switching valve d2 switches the clean water nozzle 5 to the closed state, the first interface 1 and the fourth interface 4 are closed, and the second interface 2 is in communication with the third interface 3. The four-tube faucet in other embodiments may be similar to the structure in this embodiment except that the water passage switching valve 7 and the pure water outlet nozzle 5 are formed in a separate or integral structure.

The first control valve 18 and the second control valve 21 employ a pressure control valve. For example, the first control valve and the second control valve can be closed at a pressure of 0.1 MPa, so that the pressure of the water storage tank is less than 0.1 MPa. In addition, the rest of the structure in this embodiment is the same as that of the water purifier in the fourth embodiment, and details are not described herein again.

Example 7:

As shown in Fig. 9, in the water purifier of this embodiment, the function of the second control valve in the fifth embodiment is realized by the faucet e. Of course, the function of the first control valve 18 can also be achieved by the faucet d. In addition, the pure water machine Further, a concentrated water outlet 6 communicating with the first port 1 of the water passage switching valve 7 is included, and the opening and closing of the concentrated water outlet 6 is controlled by an independent on-off valve. The water flowing out of the concentrated water outlet 6 in the water purifier can be used as domestic water. When concentrated water is used, the concentrated water outlet 6 communicates with the first interface 1, and the second interface 2 communicates with the third interface 3. The fourth interface 4 is closed. At this time, the concentrated water flowing out from the concentrated water outlet of the reverse osmosis membrane device 14 flows into the concentrated water discharge nozzle 6 through the first port 1, and the pure water from the pure water outlet of the reverse osmosis membrane device 14 flows into the pure water port of the storage tank 10. The pure water in the water storage tank 10 can smoothly press out the concentrated water from the water storage tank 10, and the concentrated concentrated water flows into the third port 3 and the second port 2 of the faucet in turn and is discharged through the water discharge port 17. The rest of the structure in this embodiment is the same as that of the pure water machine of the fifth embodiment, and details are not described herein again.

The above description is only a preferred embodiment of the present invention, and it should be noted that various modifications and improvements can be made to the present invention without departing from the principles of the present invention. Within the scope of protection of the present invention.

Claims

A reverse osmosis pure water machine comprises a water storage tank (10) and a reverse osmosis membrane device (14), wherein the reverse osmosis membrane device (14) is provided with a water inlet, a pure water outlet and a concentrated water outlet, the water storage tank (10) having a pure water port and a concentrated water port, the pure water outlet of the reverse osmosis membrane device (14) is in communication with a pure water port of the water storage tank (10), and the inside of the water storage tank (10) is separated by a diaphragm (11) a first chamber partitioned into pure water and a second chamber for storing concentrated water, characterized in that:

Also included is a waterway switching valve (7) and a pure water nozzle (5) for communicating with the pure water port of the water storage tank (10);

The waterway switching valve (7) includes a first interface (1), a second interface (2), and a third interface (3), and the waterway switching valve (7) can be switched to the first interface (1) and the The three interfaces (3) are connected or switched to the second interface (2) and are connected to the third interface (3);

The concentrated water outlet of the reverse osmosis membrane device (14) branches into a first branch (161) and a second branch (162), and the first branch (161) is connected to the first interface (1) through;

The concentrated water inlet of the water storage tank (10) is in communication with the third interface (3), and the second branch (162) is connected in series to close the concentrated water when the water storage tank (10) is filled with pure water. The discharged first control valve (18) communicates with the drain port (17) of the second branch (162).
The reverse osmosis water purifier according to claim 1, characterized in that the pure water outlet nozzle (5) is integrated with the waterway switching valve (7) to form a four-tube faucet.
The reverse osmosis water purifier according to claim 1, characterized in that the pure water outlet nozzle (5) is provided separately from the water passage switching valve (7).
The reverse osmosis pure water machine according to claim 1, wherein an on-off valve is installed on a water path between the pure water outlet (5) and the pure water port of the water storage tank (10) ( 8).
The reverse osmosis pure water machine according to claim 1, wherein a water connection between the pure water outlet of the reverse osmosis membrane device (14) and the pure water port of the water storage tank (10) is connected in series There is a first check valve (20) that allows only the pure water flowing out of the reverse osmosis membrane device (14) to flow into the water storage tank (10) and the pure water discharge nozzle (5).
The reverse osmosis pure water machine according to claim 1, wherein a water connection between the pure water outlet of the reverse osmosis membrane device (14) and the pure water port of the water storage tank (10) is connected in series The second control valve (21) capable of preventing the pure water flowing out of the reverse osmosis membrane device (14) from flowing into the water storage tank (10) in a state where the water tank (10) is filled with pure water.
The reverse osmosis pure water machine according to claim 6, wherein said first control valve (18) and said second control valve (21) are integrated on said water storage tank (10) and said Mechanical valve driven by diaphragm (11).
The reverse osmosis pure water machine according to claim 1, characterized in that: on the water path between the second interface (2) and the drain port (17), a second line allowing only water from the second port is connected in series Check valve (9).
The reverse osmosis pure water machine according to any one of claims 1 to 8, further comprising a concentrated water outlet for communicating with the first interface (1) of the water switching valve (7) Mouth (6).
A water production method using the reverse osmosis pure water machine according to any one of claims 1 to 9, characterized in that:

When pure water is used, the water switching valve (7) is switched to connect the first interface (1) and the third interface (3), and the pure water outlet (5) is connected to the pure water port of the water storage tank (10). The second port (2) is closed, and the water flowing in from the water inlet of the reverse osmosis membrane device (14) passes through the reverse osmosis membrane device (14), flows out through the concentrated water outlet, and further flows into the first branch of the concentrated water outlet. Road (161), the concentrated water flowing out from the first branch (161) flows into the condensate of the water storage tank (10) through the first interface (1) and the third interface (3), and the concentrated water in the water storage tank (10) Extruding pure water out of the water storage tank (10), and the squeezed pure water flows to the pure water outlet nozzle (5);

When the pure water is stopped, the water switching valve (7) is switched to close the first interface (1), and the second interface (2) is connected to the third interface (3), from the pure water outlet of the reverse osmosis membrane device (14). The pure water flowing out flows into the water storage tank (10), and the pure water in the water storage tank (10) presses the concentrated water out of the water storage tank (10), and the concentrated concentrated water flows into the water passage switching valve (7) in turn. The three interfaces (3) and the second interface (2) are discharged through the drain port (17).