Water treatment system

Abstract

The utility model relates to the technical field of water quality treatment, in particular to a water treatment system which comprises a filtering device, the filtering device comprises a sand filtering tank, a first backwashing assembly, a carbon filtering tank and a second backwashing assembly, the first backwashing assembly is installed on the sand filtering tank, and the second backwashing assembly is installed on the carbon filtering tank. The first backwashing assembly comprises a first conveying pipeline and a first adjusting part, the first adjusting part is mounted on the first conveying pipeline, the second backwashing assembly comprises a second conveying pipeline and a second adjusting part, and the second adjusting part is mounted on the second conveying pipeline; the arranged water treatment system is convenient for realizing multi-layer sand filtration of raw water through a sand filtration tank and a carbon filtration tank, and is matched with a first backwashing assembly and a second backwashing assembly to quickly flush particulate matters and pollutants deposited at the joints of filter material layers and pipelines in the sand filtration tank and the carbon filtration tank, so as to prevent the joints from being blocked; the filtering effects of the sand filter and the carbon filter tank are further improved, and meanwhile, the effluent quality is improved.

Description

Technical Field

[0001] The present application relates to the technical field of water treatment, and in particular to a water treatment system. Background Art

[0002] As food safety and drinking water quality standards continue to improve, the public's attention to food safety and drinking water quality is increasing, and the quality requirements for canned water are becoming more stringent. Therefore, in order to ensure the quality and safety of canned water, water treatment technology is needed to remove various impurities and harmful substances in the water.

[0003] In the prior art, the water treatment system includes the steps of pretreatment, filtration, softening, reverse osmosis, disinfection and storage in sequence; the pretreatment includes a sedimentation tank for adjusting the water quality, the filtration includes a sand filter and an activated carbon filter, the softening uses an ion exchanger, the reverse osmosis treatment includes a high-pressure pump, a reverse osmosis membrane assembly and a membrane shell, the disinfection includes an ultraviolet disinfector, and the storage includes a water storage tank; before the canned water enters the canning workshop, the raw water is first connected to the sedimentation tank and the large particles of impurities in the raw water are removed through pretreatment to make the raw water homogenized, and then the pretreated water is connected to the sand filter and the activated carbon filter in sequence In the process, the sand filter is used to further remove suspended particles in the water, the activated carbon filter adsorbs organic matter and residual chlorine in the water to improve the taste and odor of the water, and then the ion exchanger is used to soften and remove hardness ions in the water to prevent scale from being generated during subsequent treatment and canning. After the softened water enters the reverse osmosis system, most of the soluble impurities are removed through the reverse osmosis membrane under the action of the high-pressure pump. After the reverse osmosis water enters the ultraviolet sterilizer, it is treated to kill microorganisms. Finally, the treated water is stored in the water storage tank and transported to the canning workshop through a pipeline for use.

[0004] With respect to the above-mentioned related technologies, during the raw water filtration process, the particulate matter and pollutants deposited in the sand filter are prone to form blockages at the filter material layer and the pipe connection, affecting the filtering effect of the filter. Utility Model Content

[0005] In order to improve the filtering effect of the filter and thus improve the quality of effluent water, the present application provides a water treatment system.

[0006] The water treatment system provided in this application adopts the following technical solution:

[0007] A water treatment system comprises a filter device, the filter device comprises a sand filter tank and a first backwashing assembly, the first backwashing assembly is mounted on the sand filter tank;

[0008] The first backwashing assembly includes a first delivery pipeline and a first regulating member, wherein the first regulating member is installed on the first delivery pipeline, and the first regulating member is used to control the on and off of the water flow in the first delivery pipeline;

[0009] The first delivery pipeline includes a first water inlet pipe and a first delivery pipe, one end of the first water inlet pipe is connected to the raw water pipeline, and the first water inlet pipe is also provided with a first connecting pipe, one end of the first connecting pipe is connected to the inner cavity of the first water inlet pipe, and the other end is connected to the top wall of the sand filter tank, and the first connecting pipe is connected to the inner cavity of the sand filter tank;

[0010] One end of the first delivery pipe is connected to the first water inlet pipe, and the other end is connected to the bottom wall of the sand filter tank, and the first delivery pipe is communicated with the inner cavity of the sand filter tank. A first drain pipe is also provided on the first delivery pipe, and one end of the first drain pipe is communicated with the first delivery pipe.

[0011] By adopting the above technical scheme, when the raw water is subjected to a primary sand filtration, the raw water is firstly pumped into the first water inlet pipe from the raw water pipeline, and then the first regulating member is adjusted to control the on and off of the water flow in the first water inlet pipe, so that the raw water only enters the sand filter tank from the first connecting pipe and realizes the primary sand filtration of the raw water, and the filtered water after the primary sand filtration is discharged through the first delivery pipe, and at the same time, the first regulating member is adjusted to control the filtered water to be transported to the next filtration process only through the first drainage pipe, and after the sand filter tank has worked for a period of time, the first regulating member is adjusted again to control the raw water pumped into the first water inlet pipe to enter the sand filter tank from the first delivery pipe, so as to realize the flushing of the granular matter and pollutants deposited at the filter material layer and the pipe connection in the sand filter tank, and the flushed waste water is transported to the first water inlet pipe from the first connecting pipe and then discharged; the water treatment system is provided, so as to realize the primary sand filtration of the raw water through the sand filter tank, and at the same time, cooperate with the first backwashing component to quickly realize the flushing of the granular matter and pollutants deposited at the filter material layer and the pipe connection in the sand filter tank to prevent them from forming blockage, which is conducive to further improving the filtering effect of the sand filter and improving the water quality of the effluent.

[0012] Preferably, the first regulating member includes two groups of first regulating valves, and the two groups of first regulating valves are respectively installed on the first water inlet pipe and the first delivery pipe.

[0013] By adopting the above technical solution, the first regulating member is provided to facilitate the staff to timely control the on-off of the water flow in the first water inlet pipe and the first delivery pipe and the flow direction of the raw water and the filtered water by adjusting the first regulating valve at different positions.

[0014] Preferably, the filtering device further comprises a carbon filter canister and a second backwashing assembly, wherein the second backwashing assembly is mounted on the carbon filter canister;

[0015] The second backwashing assembly includes a second delivery pipeline and a second regulating member, wherein the second regulating member is installed on the second delivery pipeline, and the second regulating member is used to control the on and off of the water flow in the second delivery pipeline;

[0016] The second delivery pipeline includes a second water inlet pipe and a second delivery pipe, one end of the second water inlet pipe is connected to the first drainage pipe, and the second water inlet pipe is further provided with a second connecting pipe, one end of the second connecting pipe is communicated with the inner cavity of the second water inlet pipe, and the other end is connected to the top wall of the carbon filter canister, and the second connecting pipe is communicated with the inner cavity of the carbon filter canister;

[0017] One end of the second delivery pipe is connected to the second water inlet pipe, and the other end is connected to the bottom wall of the charcoal filter canister, and the second delivery pipe is connected to the inner cavity of the charcoal filter canister. A second drain pipe is also provided on the second delivery pipe, and one end of the second drain pipe is connected to the second delivery pipe.

[0018] By adopting the above technical scheme, when the raw water is subjected to secondary filtration, the filtered water first enters the second water inlet pipe from the first drainage pipe, and then the water flow in the second water inlet pipe is controlled by adjusting the second regulating member, so that the raw water enters the carbon filter tank only from the second connecting pipe and realizes secondary filtration of the filtered water. The filtered water after secondary filtration is discharged through the second delivery pipe, and at the same time, the second regulating member is adjusted to control the filtered water to be delivered to the next filtration process only from the second drainage pipe. After the carbon filter tank has worked for a period of time, the second regulating member is adjusted again to control the filtered water in the second water inlet pipe to enter the carbon filter tank from the second delivery pipe, so as to realize the flushing of the deposited particulate matter and pollutants in the filter material layer and the pipe connection in the carbon filter tank, and the flushed waste water is delivered to the second water inlet pipe from the second connecting pipe and then discharged. The water treatment system is provided to facilitate the secondary filtration of the filtered water through the carbon filter tank, and at the same time, cooperate with the second backwashing component to quickly realize the flushing of the deposited particulate matter and pollutants in the filter material layer and the pipe connection in the carbon filter tank to prevent them from forming blockage, which is conducive to further improving the filtering effect of the carbon filter and improving the water quality of the effluent.

[0019] Preferably, the second regulating member includes two groups of second regulating valves, and the two groups of second regulating valves are respectively installed on the second water inlet pipe and the second delivery pipe.

[0020] By adopting the above technical solution and setting the second regulating member, the staff can adjust the second regulating valve at different positions to timely control the on-off of the water flow in the second water inlet pipe and the second delivery pipe and the flow direction of the filtered water.

[0021] Preferably, the filtering device is provided in two groups.

[0022] By adopting the above technical solution, two groups of filtering devices can be set up to form a parallel working mode, which is beneficial to improving the filtration speed. At the same time, the two groups of filtering devices can serve as backup for each other to prevent one group of filtering devices from malfunctioning or requiring maintenance. The other group of filtering devices can take over all the work and ensure the continuous and stable operation of the water treatment system.

[0023] Preferably, an air pressure balance pipe is installed on both the sand filter tank and the carbon filter tank, and the air pressure balance pipe is connected to the inner cavity of the sand filter tank or the carbon filter tank, and one end of the air pressure balance pipe extends out of the inner cavity of the sand filter tank or the carbon filter tank.

[0024] By adopting the above technical scheme, the air pressure balance pipe is convenient for balancing the air pressure inside and outside the filter canister by connecting with the outside air, which can effectively prevent the filter canister from being affected by excessively high or low air pressure. At the same time, it is convenient to observe and adjust the working status of the air pressure balance pipe, so as to timely discover and solve the problem of abnormal air pressure inside the filter canister, which is beneficial to extend the service life of the filter canister.

[0025] Preferably, an observation pipe is detachably and fixedly connected to the first drain pipe; the observation pipe includes a filtering section and an observation section which are integrally arranged, the filtering section is connected to the observation pipe, and the filtering section is inclined from high to low from a side close to the observation section to a side away from the observation section.

[0026] By adopting the above technical scheme, the observation tube is arranged to facilitate real-time observation and detection of the conveying process of filtered water from the sand filter tank to the carbon filter tank; the inclined filter section is convenient for the sedimentation and filtration of solid particles in the filtered water, which is beneficial to improving the effluent water quality; in addition, the detachable and fixed connection between the observation tube and the first drain pipe also facilitates the rapid disassembly and maintenance of the observation tube.

[0027] Preferably, a fine filter tank is further included, wherein the fine filter tank is connected to the carbon filter tank via the second drain pipe, and the second drain pipe is connected to the inner cavity of the fine filter tank.

[0028] By adopting the above technical solution, the fine filter tank is set up to further fine filter the filtered water treated by the carbon filter tank, thereby further improving the effluent water quality.

[0029] Preferably, it also includes a reverse osmosis device and a liquid storage tank, wherein the reverse osmosis device is connected to the discharge end of the fine filtration tank and communicated with the inner cavity of the fine filtration tank, and the liquid storage tank is connected to the discharge end of the reverse osmosis device and communicated with the inner cavity of the reverse osmosis device.

[0030] By adopting the above technical solution, the reverse osmosis device can remove impurities such as soluble solids, heavy metals, pesticide residues, organic matter and microorganisms in the filtered water, which is beneficial to further improve the water quality and increase the water purity; the water storage tank is set up to facilitate the storage of clean water treated by the reverse osmosis device.

[0031] In summary, the present application includes at least one of the following beneficial technical effects:

[0032] 1. The water treatment system is set up to facilitate the primary sand filtration of raw water through the sand filter tank, and at the same time cooperate with the first backwash component to quickly flush the filter material layer in the sand filter tank and the deposited particulate matter and pollutants at the pipe connection to prevent them from clogging, which is beneficial to further improve the filtering effect of the sand filter and improve the water quality of the effluent.

[0033] 2. The water treatment system is set up to facilitate the secondary filtration of filtered water through the carbon filter tank. At the same time, it cooperates with the second backwash component to quickly flush the deposited particulate matter and pollutants in the filter layer in the carbon filter tank and the pipeline connection to prevent them from clogging, which is beneficial to further improve the filtering effect of the carbon filter and improve the water quality of the effluent.

[0034] 3. Setting up two groups of filtering devices can form a parallel working mode, which is beneficial to improving the filtering speed. At the same time, the two groups of filtering devices can serve as backup for each other to prevent one group of filtering devices from failing or requiring maintenance. The other group of filtering devices can take over all the work and ensure the continuous and stable operation of the water treatment system. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a schematic diagram of the overall structure of the water treatment system of the embodiment of the present application.

[0036] Figure 2 It is a partial structural schematic diagram of the water treatment system of an embodiment of the present application, and is intended to illustrate the first backwash component.

[0037] Figure 3 It is a partial structural diagram of the water treatment system of an embodiment of the present application, and is intended to illustrate the second backwash component.

[0038] Explanation of the reference numerals: 1. filtration device; 11. sand filter tank; 12. first backwashing assembly; 121. first delivery pipeline; 1211. first water inlet pipe; 1212. first delivery pipe; 1213. first connecting pipe; 1214. first drain pipe; 122. first regulating member; 1221. first regulating valve; 13. carbon filter tank; 14. second backwashing assembly; 141. second delivery pipeline; 1411. second water inlet pipe; 1412. second delivery pipe; 1413. second connecting pipe; 1414. second drain pipe; 142. second regulating member; 1421. second regulating valve; 15. air pressure balance pipe; 16. observation pipe; 161. filtration section; 162. observation section; 17. fine filter tank; 2. reverse osmosis device; 3. liquid storage tank. DETAILED DESCRIPTION

[0039] The following is combined with Figure 1-3 This application is described in further detail.

[0040] The embodiment of the present application discloses a water treatment system.

[0041] Reference Figure 1 A water treatment system includes a filtering device 1, a fine filtering tank 17, a reverse osmosis device 2 and a liquid storage tank 3 which are arranged in sequence.

[0042] Reference Figure 1 In the present application, two groups of filter devices 1 are provided, and the two groups of filter devices 1 are distributed in a parallel working mode. The filter device 1 includes a sand filter tank 11, a first backwash component 12, a carbon filter tank 13 and a second backwash component 14. The first backwash component 12 is installed on the sand filter tank 11, and the second backwash component 14 is installed on the carbon filter tank 13. The sand filter tank 11 and the carbon filter tank 13 are both installed with an air pressure balance pipe 15. One end of the air pressure balance pipe 15 is connected to the top wall of the sand filter tank 11 or the carbon filter tank 13 and is connected to the inner cavity of the sand filter tank 11 or the carbon filter tank 13, and the other end extends out of the inner cavity of the carbon filter tank 13 or the sand filter tank 11.

[0043] Reference Figure 1 and Figure 2The first backwashing assembly 12 includes a first delivery pipe 121 and a first regulating member 122. The first regulating member 122 is installed on the first delivery pipe 121. The first delivery pipe 121 includes a first water inlet pipe 1211, a first connecting pipe 1213, a first delivery pipe 1212 and a first drain pipe 1214. One end of the first water inlet pipe 1211 is connected to the raw water pipe and connected to the raw water pool, and the other end is set as a wastewater discharge port. The first connecting pipe 1213 is connected to the side wall of the first water inlet pipe 1211, and the first connecting pipe 12 One end of the first water inlet pipe 1211 is connected to the inner cavity of the first water inlet pipe 1211, and the other end is connected to the top wall of the sand filter tank 11 and is connected to the inner cavity of the sand filter tank 11. One end of the first delivery pipe 1212 is connected to the side wall of the first water inlet pipe 1211 and is connected to the inner cavity of the first water inlet pipe 1211, and the other end is connected to the bottom wall of the sand filter tank 11 and is connected to the inner cavity of the sand filter tank 11. One end of the first drain pipe 1214 is connected to the side wall of the first delivery pipe 1212 and is connected to the inner cavity of the first delivery pipe 1212, and the other end is connected to the bottom wall of the sand filter tank 11 and is connected to the inner cavity of the sand filter tank 11. The first regulating member 122 includes two sets of first regulating valves 1221, which are respectively installed on the first water inlet pipe 1211 and the first delivery pipe 1212. In this embodiment, the two sets of first regulating valves 1221 are respectively arranged near the connection between the first water inlet pipe 1211 and the first connecting pipe 1213 and the connection between the first delivery pipe 1212 and the first drain pipe 1214. The two sets of first regulating valves 1221 are used to control the on-off of the water flow in the first delivery pipe 121 and The flow direction of raw water; in addition, in the present application, a detachable observation tube 16 is also provided on the first drain pipe 1214, and the observation tube 16 is configured as a transparent visual tube, and the observation tube 16 includes an integrally arranged observation section 162 and a filter section 161, and both ends of the observation section 162 are respectively connected to the first drain pipe 1214, the filter section 161 is connected to the side wall of the observation section 162 and is connected to the inner cavity of the observation section 162, and the filter section 161 is inclined from high to low from the side close to the observation section 162 to the end away from the observation section 162.

[0044] Reference Figure 1 and Figure 3The second backwashing assembly 14 includes a second delivery pipe 141 and a second regulating member 142, and the second regulating member 142 is installed on the second delivery pipe 141; the second delivery pipe 141 includes a second water inlet pipe 1411, a second connecting pipe 1413, a second delivery pipe 1412 and a second drain pipe 1414, one end of the second water inlet pipe 1411 is connected to the first drain pipe 1214, and the other end is set as a waste liquid discharge port, the second connecting pipe 1413 is connected to the side wall of the second water inlet pipe 1411, and one end of the second connecting pipe 1413 is connected to the inner cavity of the second water inlet pipe 1411, and the other end is connected to the top wall of the carbon filter tank 13 and is connected to the inner cavity of the carbon filter tank 13, one end of the second delivery pipe 1412 is connected to the side wall of the second water inlet pipe 1411 and is connected to the inner cavity of the second water inlet pipe 1411, The other end is connected to the bottom wall of the carbon filter tank 13 and is connected to the inner cavity of the carbon filter tank 13. One end of the second drain pipe 1414 is connected to the side wall of the second delivery pipe 1412 and is connected to the inner cavity of the second delivery pipe 1412, and the other end is connected to the top wall of the fine filter tank 17 and is connected to the inner cavity of the fine filter tank 17; the second adjusting member 142 includes two groups of second regulating valves 1421, and the two groups of second regulating valves 1421 are respectively installed on the second water inlet pipe 1411 and the second delivery pipe 1412. In this embodiment, the two groups of second regulating valves 1421 are respectively arranged near the connection between the second water inlet pipe 1411 and the second connecting pipe 1413 and the connection between the second delivery pipe 1412 and the second drain pipe 1414. The two groups of second regulating valves 1421 are used to control the on-off of the water flow in the second delivery pipe 141 and the flow direction of the raw water.

[0045] Reference Figure 1 The fine filter tank 17 is connected to the carbon filter tank 13 through the second drain pipe 1414, and one end of the first drain pipe 1214 is connected to the inner cavity of the fine filter tank 17. The reverse osmosis device 2 is connected to the discharge end of the fine filter tank 17 through a pipeline and is connected to the inner cavity of the fine filter tank 17. The liquid storage tank 3 is installed at the discharge end of the reverse osmosis device 2 and is connected to the inner cavity of the reverse osmosis device 2 through a pipeline, and is used to store clean water filtered by the water treatment system. In this embodiment, the discharge end of the reverse osmosis device 2 is also provided with a concentrated water discharge port.

[0046] The implementation principle of a water treatment system in an embodiment of the present application is as follows: first, raw water is extracted from a raw water pool and transported to a filter device 1 through a raw water pipeline, and then the raw water is sand filtered once through a sand filter tank 11 and a first backwash component 12, and the treated filtered water is transported to a carbon filter tank 13, while flushing the particulate matter and pollutants deposited in the filter material layer in the sand filter tank 11 and at the connection of the pipeline, and then the filtered water is secondary filtered through the carbon filter tank 13 and a second backwash component 14, and the treated filtered water is transported to a fine filter tank 17, while flushing the particulate matter and pollutants deposited in the filter material layer in the carbon filter tank 13 and at the connection of the pipeline, and then other impurities in the filtered water are further removed through the fine filter tank 17 and the reverse osmosis device 2 in sequence, and finally the treated clean water is transported and stored in a liquid storage tank 3.

[0047] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A water treatment system, characterized in that: The filter device (1) comprises a sand filter tank (11) and a first backwashing assembly (12), wherein the first backwashing assembly (12) is installed on the sand filter tank (11); The first backwashing assembly (12) comprises a first delivery pipeline (121) and a first regulating member (122), wherein the first regulating member (122) is installed on the first delivery pipeline (121), and the first regulating member (122) is used to control the on and off of the water flow in the first delivery pipeline (121); The first delivery pipeline (121) comprises a first water inlet pipe (1211) and a first delivery pipe (1212); one end of the first water inlet pipe (1211) is connected to a raw water pipeline; a first connecting pipe (1213) is further provided on the first water inlet pipe (1211); one end of the first connecting pipe (1213) is in communication with an inner cavity of the first water inlet pipe (1211); the other end of the first connecting pipe (1213) is connected to a top wall of the sand filter tank (11); and the first connecting pipe (1213) is in communication with the inner cavity of the sand filter tank (11); One end of the first delivery pipe (1212) is connected to the first water inlet pipe (1211), and the other end is connected to the bottom wall of the sand filter tank (11), and the first delivery pipe (1212) is communicated with the inner cavity of the sand filter tank (11). A first drainage pipe (1214) is also provided on the first delivery pipe (1212), and one end of the first drainage pipe (1214) is communicated with the first delivery pipe (1212).

2. The water treatment system according to claim 1, characterized in that: The first regulating member (122) comprises two groups of first regulating valves (1221), and the two groups of first regulating valves (1221) are respectively installed on the first water inlet pipe (1211) and the first delivery pipe (1212).

3. The water treatment system according to claim 1, characterized in that: The filtering device (1) further comprises a carbon filter tank (13) and a second backwashing assembly (14), wherein the second backwashing assembly (14) is mounted on the carbon filter tank (13); The second backwashing assembly (14) comprises a second delivery pipeline (141) and a second regulating member (142), wherein the second regulating member (142) is installed on the second delivery pipeline (141), and the second regulating member (142) is used to control the on and off of the water flow in the second delivery pipeline (141); The second delivery pipeline (141) comprises a second water inlet pipe (1411) and a second delivery pipe (1412); one end of the second water inlet pipe (1411) is connected to the first drainage pipe (1214); a second connecting pipe (1413) is also provided on the second water inlet pipe (1411); one end of the second connecting pipe (1413) is connected to the inner cavity of the second water inlet pipe (1411); the other end of the second connecting pipe (1413) is connected to the top wall of the carbon filter tank (13); and the second connecting pipe (1413) is connected to the inner cavity of the carbon filter tank (13); One end of the second delivery pipe (1412) is connected to the second water inlet pipe (1411), and the other end is connected to the bottom wall of the charcoal filter tank (13), and the second delivery pipe (1412) is connected to the inner cavity of the charcoal filter tank (13). A second drain pipe (1414) is also provided on the second delivery pipe (1412), and one end of the second drain pipe (1414) is connected to the second delivery pipe (1412).

4. The water treatment system according to claim 3, characterized in that: The second regulating member (142) comprises two sets of second regulating valves (1421), and the two sets of second regulating valves (1421) are respectively installed on the second water inlet pipe (1411) and the second delivery pipe (1412).

5. The water treatment system according to claim 3, characterized in that: The filtering device (1) is provided in two groups.

6. The water treatment system according to claim 5, characterized in that: The sand filter tank (11) and the carbon filter tank (13) are both equipped with an air pressure balance pipe (15), the air pressure balance pipe (15) is connected to the inner cavity of the sand filter tank (11) or the carbon filter tank (13), and one end of the air pressure balance pipe (15) extends out of the inner cavity of the sand filter tank (11) or the carbon filter tank (13).

7. The water treatment system according to claim 6, characterized in that: An observation pipe (16) is detachably and fixedly connected to the first drainage pipe (1214); the observation pipe (16) comprises an integrally arranged filtering section (161) and an observation section (162); the filtering section (161) is connected to the observation pipe (16), and the filtering section (161) is inclined from high to low from a side close to the observation section (162) to a side away from the observation section (162).

8. The water treatment system according to claim 5, characterized in that: It also includes a fine filter tank (17), wherein the fine filter tank (17) is connected to the carbon filter tank (13) via the second drain pipe (1414), and the second drain pipe (1414) is connected to the inner cavity of the fine filter tank (17).

9. The water treatment system according to claim 8, characterized in that: It also comprises a reverse osmosis device (2) and a liquid storage tank (3), wherein the reverse osmosis device (2) is connected to the discharge end of the fine filter tank (17) and is communicated with the inner cavity of the fine filter tank (17), and the liquid storage tank (3) is connected to the discharge end of the reverse osmosis device (2) and is communicated with the inner cavity of the reverse osmosis device (2).

Images