Box-shaped drinking water purifying device and method for discharging residual water

Abstract

The invention discloses a box-shaped drinking water purifying device and a method for discharging residual water, and relates to the technical field of water purifying devices. The box-shaped drinking water purifying device comprises a water purifying mechanism, a first front pipe, a first self-control water passing valve and a first water outlet pipe which are sequentially connected, and further comprises an expansion piece, a piston, an empty cylinder and a first guide pipe. The expansion piece is connected with a piston which is installed in the empty cylinder. One end of the first guide pipe is seamlessly communicated with the tail end of the empty cylinder. The other end of the first guide pipe is communicated with the first water outlet pipe and connected with one end of the first self-control water passing valve. After water is taken, the first self-control water passing valve is closed, the first water outlet pipe is further filled with water, the expansion piece is started, the piston extrudes air in the empty cylinder, the air enters the end, connected with the first self-control water passing valve, of the first water outlet pipe, and residual water in the first water outlet pipe is completely discharged by continuously blowing in the air; water drops adhered to the inner wall of the first water outlet pipe are not contained, so that the produced water is kept high in cleanliness when the water is taken next time.

Description

Technical Field

[0001] The present application relates to the technical field of water purification devices, and in particular to a box-shaped drinking water purification device and a method for discharging residual water. Background Art

[0002] The box-shaped drinking water purification device uses reverse osmosis technology. The raw water passes through a fine filter, a granular activated carbon filter, a compressed activated carbon filter, etc., and then is pressurized by a pump. A reverse osmosis membrane (RO membrane) with a pore size of 1 / 10000μm (equivalent to 1 / 6000 the size of E. coli and 1 / 300 the size of a virus) is used to adsorb or discharge solid particle impurities, heavy metals, bacteria, viruses and other impurities from the device, so that the output water meets the physical and chemical indicators and hygiene standards specified for drinking and can be directly drunk.

[0003] After the box-shaped drinking water purification device produces pure water, water will generally remain in the outer section of the pipe outside the water outlet valve. This residual water is easy to absorb dust and breed bacteria. When the water is taken next time, this residual water will be mixed into the newly produced water, reducing the cleanliness of the produced water. In addition, for the hot water channel, since this residual water is cold water, when the hot water is discharged from the inside to the outside, this residual water will be mixed into the hot water, reducing the temperature of the hot water. Summary of the invention

[0004] In view of the fact that after a box-type drinking water purification device produces pure water, water is generally left in the outer section of the pipe outside the outlet valve. This residual water easily absorbs dust and breeds bacteria. When water is taken next time, this residual water is mixed into the newly produced water, reducing the cleanliness of the produced water. The present application proposes a box-type drinking water purification device and a method for discharging residual water to solve this problem.

[0005] In a first aspect, the present application proposes a box-shaped drinking water purification device, and adopts the following technical solution.

[0006] A box-shaped drinking water purification device comprises a water purification mechanism, a first front pipe, a first automatic water valve and a first water outlet pipe which are connected in sequence, and also comprises a telescoping device, a piston, a hollow cylinder and a first conduit.

[0007] The retractor is connected to the piston, and the piston is installed in the empty cylinder. One end of the first conduit is seamlessly connected to the end of the empty cylinder. The retractor can drive the piston to move back and forth along the empty cylinder, so that the piston abuts or moves away from the end of the empty cylinder, and the piston maintains seamless contact with the empty cylinder during the movement. The other end of the first conduit is connected to one end of the first water outlet pipe connected to the first automatic water valve. The maximum volume of the empty cylinder is greater than the volume of the first water outlet pipe.

[0008] By adopting the above technical solution, after water is taken, the first automatic water-passing valve is closed, and the first water outlet pipe is still filled with water. At this time, by starting the telescopic device, the piston squeezes the air in the empty cylinder, so that air enters the first water outlet pipe connected to one end of the first automatic water-passing valve. By continuously blowing in air, the residual water in the first water outlet pipe is completely discharged, and does not contain water droplets adhering to the inner wall of the first water outlet pipe. Therefore, when water is taken next time, the output water is kept at a high cleanliness.

[0009] It should be noted that the maximum volume of the empty cylinder is the volume of the space between the piston inside the empty cylinder and the end of the empty cylinder when the piston is at the position farthest from the end of the empty cylinder.

[0010] A preferred structure of the box-shaped drinking water purification device is that the other end of the first conduit is connected to the upper side of one end of the first water outlet pipe connected to the first automatic water valve.

[0011] Since the density of air is less than that of water, by adopting the above technical solution, air enters from the upper side of the first water outlet pipe and remains in the first water outlet pipe, and is not easily discharged directly from the first water outlet pipe, thereby better occupying the existing space of water and gradually expelling the water from the first water outlet pipe.

[0012] A preferred structure of the box-shaped drinking water purification device is that the box-shaped drinking water purification device also includes a second front pipe, a heater, a second automatic water valve, a second water outlet pipe and a second conduit.

[0013] The second front pipe, the second automatic water valve and the second water outlet pipe are connected in sequence. The second front pipe is connected to the water purification mechanism. The heater is installed on the second front pipe.

[0014] One end of the second conduit is connected to the end of the empty cylinder, and the other end of the second conduit is connected to one end of the second outlet pipe connected to the second automatic water valve. The maximum volume of the empty cylinder is greater than the sum of the volumes of the first outlet pipe and the second outlet pipe.

[0015] By adopting the above technical solution, a combination of a telescoping device, a piston and a hollow cylinder can remove the residual water at the ends of the two pipelines, thereby reducing the number of instruments to be installed and reducing costs.

[0016] A preferred structure of the box-shaped drinking water purification device is that the other end of the second conduit is connected to the upper side of one end of the second water outlet pipe connected to the second automatic water valve.

[0017] By adopting the above technical solution, the air discharged from the second duct can directly enter the upper side of the second water outlet pipe. Compared with entering the second water outlet pipe from the bottom, this structure makes it difficult for the air to float in the water, reduces the disturbance of the air, and the air has a high efficiency in displacing the water in the second water outlet pipe, and the drainage is cleaner.

[0018] A preferred structure of the box-shaped drinking water purification device is that the box-shaped drinking water purification device further comprises a first automatic air-passing valve and a second automatic air-passing valve. The first automatic air-passing valve is installed on the first conduit. The second automatic air-passing valve is installed on the second conduit.

[0019] By adopting the above technical solution, when water remains in the first water outlet pipe or the second water outlet pipe, the direction of the gas discharged from the empty cylinder can be controlled by the first automatic air valve and the second automatic air valve, so that the air flows into the pipeline with residual water. If the first automatic air valve and the second automatic air valve are not provided, when water remains in the first water outlet pipe or the second water outlet pipe, the water pipe with residual water has a large resistance to the gas, and the water pipe without residual water has a small resistance to the gas. The gas discharged from the empty cylinder exhausts the two water pipes at the same time, and the gas is easily discharged from the water pipe without residual water, so that the residual water in the water pipe with residual water cannot be discharged well.

[0020] A preferred structure of the box-shaped drinking water purification device is that the purification mechanism includes a polypropylene fiber cotton filter, a granular activated carbon filter, a compressed activated carbon filter, a water pump, a reverse osmosis membrane filter and a post-activated carbon filter which are sequentially connected through a connecting pipe.

[0021] The water purification mechanism further comprises a waste discharge pipe and a pressure barrel. The waste discharge pipe is connected to the reverse osmosis membrane filter. The pressure barrel is connected to the inlet end of the post-activated carbon filter. The outlet end of the post-activated carbon filter is connected to the first front pipe and the second front pipe.

[0022] By adopting the above technical solution, the device introduces tap water and starts the water pump. The tap water first passes through a polypropylene fiber cotton filter to filter out large particles of impurities, such as mud and rust, and then passes through a granular activated carbon filter to filter out suspended matter, such as bacteria and viruses. Then, it passes through a compressed activated carbon filter to further filter out residual chlorine, organic matter, heavy metals and other harmful substances. The water passes through a reverse osmosis membrane to separate a part of it into pure water, and the other part of dirty water is discharged from a waste pipe. The pure water can be stored in a pressure barrel and discharged through a post-activated carbon filter when the water is used. The post-activated carbon filter further filters organic matter in the water to improve the taste.

[0023] On the second aspect, the present application also proposes a first method for discharging residual water and adopts the following technical solution.

[0024] A method for discharging residual water, the method is to discharge the residual water at the water outlet end of the box-shaped drinking water purification device. In an initial state, there is no water in the first water outlet pipe, the piston is installed in the empty cylinder, and the piston is located at the farthest position from the end of the empty cylinder, and the water purification mechanism is connected to a water source.

[0025] The method comprises: opening the first automatic water-flowing valve, and water flows out through the first water outlet pipe; closing the first automatic water-flowing valve, starting the retractor, and the retractor drives the piston to move to the end of the empty cylinder, and air enters the first water outlet pipe connected to one end of the first automatic water-flowing valve, and gradually squeezes out the water in the first water outlet pipe; finally, the retractor drives the piston to return to the position farthest from the end of the empty cylinder.

[0026] By adopting the above technical solution, after using water, the water purification device can automatically discharge the water in the first water outlet pipe, reduce water residue, and reduce the risk of pollution in subsequent water use.

[0027] On the second aspect, the present application also proposes a second method for discharging residual water and adopts the following technical solution.

[0028] A method for discharging residual water, the method is to discharge the residual water at the water outlet end of the box-shaped drinking water purification device. In an initial state, there is no water in the first water outlet pipe and the second water outlet pipe, the piston is installed in the empty cylinder, and the piston is located at the farthest position from the end of the empty cylinder, and the water purification mechanism is connected to a water source.

[0029] The method includes the following three methods: The first method: close the second automatic water valve and the second automatic air valve. Open the first automatic water valve, and water flows out through the first water outlet pipe. If the first automatic water valve or the second automatic water valve is not opened again within X minutes after closing the first automatic water valve, then open the first automatic air valve, start the telescope, and the telescope drives the piston to move to the end of the empty cylinder. Air enters the first water outlet pipe connected to one end of the first automatic water valve, and gradually squeezes out the water in the first water outlet pipe; finally, the telescope drives the piston back to the position farthest from the end of the empty cylinder.

[0030] The second method: close the first automatic water valve and the first automatic air valve. Open the second automatic water valve, and water flows out through the second water outlet pipe. If the first automatic water valve or the second automatic water valve is not opened again within Y minutes after closing the second automatic water valve, then open the second automatic air valve, start the telescope, and the telescope drives the piston to move to the end of the empty cylinder. Air enters the second water outlet pipe connected to one end of the second automatic water valve, and gradually squeezes out the water in the second water outlet pipe; finally, the telescope drives the piston back to the position farthest from the end of the empty cylinder.

[0031] The third method: open the first automatic water valve, and water flows out through the first water outlet pipe. If the second automatic water valve is opened within X minutes after the first automatic water valve is closed, the retractor will not be started. If the first automatic water valve or the second automatic water valve is not opened again within Y minutes after the second automatic water valve is closed, the first automatic air valve and the second automatic air valve will be opened, and the retractor will be started. The retractor drives the piston to move to the end of the empty cylinder, and air enters the end of the first water outlet pipe connected to the first automatic water valve, and air also enters the end of the second water outlet pipe connected to the second automatic water valve, gradually squeezing out the water in the first water outlet pipe and the water in the second water outlet pipe; finally, the retractor drives the piston to return to the position farthest from the end of the empty cylinder.

[0032] By adopting the above technical solution, in the structure of the water purification device with hot and cold water outlet pipes, the method sets a variety of water use conditions to remove residual water. The method is reasonable, controls the processing cost at a low level, and can basically remove the residual water.

[0033] A preferred embodiment of the above method for discharging residual water is that X=Y.

[0034] By adopting the above technical solution, the control process of the method for discharging residual water is relatively simple, the effect of discharging residual water in the double pipelines is relatively balanced, and the residual water can be basically discharged.

[0035] In summary, the box-shaped drinking water purification device and the method for discharging residual water of the present application have the following beneficial effects: when the device has only one cold water outlet structure, the first automatic water valve is closed after taking water, and the first water outlet pipe is still filled with water. At this time, by starting the telescopic device, the piston squeezes the air in the empty cylinder, so that the air enters the first water outlet pipe connected to one end of the first automatic water valve, and by continuously blowing in air, the residual water in the first water outlet pipe is completely discharged, and does not contain water droplets adhering to the inner wall of the first water outlet pipe. Then, when taking water next time, the output water is kept at a high cleanliness. When the device has a two-way cold and hot water outlet structure, by setting the processing condition value, it is convenient for users to freely take water, so that each use condition can get a good treatment to remove residual water, and keep the end of the device basically free of residual water. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 This is a diagram of the internal system structure of the first box-shaped drinking water purification device.

[0037] Figure 2 For Figure 1 Partial cross-sectional view of an empty cylinder after sectioning.

[0038] Figure 3 This is a diagram of the internal system structure of the second box-shaped drinking water purification device.

[0039] Figure 4 This is the external structure diagram of the second box-shaped drinking water purification device.

[0040] Figure 5 For Figure 4 The internal structure diagram after the shell is cut into section.

[0041] Figure numerals: 1. first front pipe; 2. first automatic water valve; 3. first water outlet pipe; 4. telescopic device; 5. piston; 6. empty cylinder; 7. first conduit; 8. second front pipe; 9. heater; 10. second automatic water valve; 11. second water outlet pipe; 12. second conduit; 13. first automatic air valve; 14. second automatic air valve; 15. polypropylene fiber cotton filter; 16. granular activated carbon filter; 17. compressed activated carbon filter; 18. water pump; 19. reverse osmosis membrane filter; 20. post-activated carbon filter; 21. waste pipe; 22. pressure barrel; 23. outer casing. DETAILED DESCRIPTION

[0042] The technical solutions in the embodiments will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the following embodiments, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0043] like Figure 1 and Figure 2 A box-shaped drinking water purification device includes a water purification mechanism, a first front pipe 1, a first automatic water valve 2 and a first water outlet pipe 3 connected in sequence, and also includes a retractor 4, a piston 5, an empty cylinder 6 and a first conduit 7. The front end of the water purification mechanism can be connected to a water source such as tap water. The first water outlet pipe 3 can flow out pure water at room temperature. The first automatic water valve 2 can be a solenoid valve, which is automatically controlled to open and close by a controller.

[0044] The telescopic device 4 can be an electric cylinder, and its telescopic shaft is connected to the piston 5, and the piston 5 is installed in the empty cylinder 6. One end of the first conduit 7 is seamlessly connected to the end of the empty cylinder 6. The telescopic device 4 can drive the piston 5 to move back and forth along the empty cylinder 6, so that the piston 5 abuts or moves away from the end of the empty cylinder 6, so that the volume of the space between the piston 5 and the end of the empty cylinder 6 changes, and the piston 5 maintains seamless contact with the empty cylinder 6 during the movement. The other end of the first conduit 7 is connected to one end of the first water outlet pipe 3 connected to the first automatic water valve 2. The maximum volume of the empty cylinder 6 is greater than the volume of the first water outlet pipe 3, so that the air in the empty cylinder 6 can be used to completely squeeze out the residual water in the first water outlet pipe 3.

[0045] After the user takes water, the interconnected expansion joint 4, piston 5, empty cylinder 6 and first conduit 7 are used to remove the residual water in the first water outlet pipe 3. One way to remove the residual water in the first water outlet pipe 3 is to close the first automatic water valve 2 to stop the water discharge after taking water from the box-shaped drinking water purification device. After that, the first water outlet pipe 3 will still be filled with water. The residual water easily absorbs dust and germs in the air. After being stationary for a long time, the residual water will become dirty. The present water purification device can remove the residual water. After the water is used, the controller receives the closing signal of the first automatic water valve 2, and then the expansion joint 4 can be started immediately or set to start the expansion joint 4 after a certain time, so as to adapt to the user taking water multiple times in a short period of time without emptying it. The action of starting the telescopic device 4 can make the piston 5 squeeze the air in the empty cylinder 6, so that the air enters the end of the first water outlet pipe 3 connected to the first automatic water valve 2 through the first conduit 7. By default, the outlet of the first water outlet pipe 3 is vertically downward or inclined downward. Preferably, the end of the first water outlet pipe 3 connected to the first automatic water valve 2 is higher than its outlet end. By continuously blowing air into the first water outlet pipe 3, the residual water in the first water outlet pipe 3 is completely discharged, and does not contain water droplets adhering to the inner wall of the first water outlet pipe 3. These water droplets can be naturally dried, so when the water is taken next time, the newly produced water is kept at a higher cleanliness.

[0046] In order to discharge the residual water more efficiently, the water purification device can preferably be designed so that the other end of the first conduit 7 is connected to the upper side of one end of the first water outlet pipe 3 connected to the first automatic water valve 2. This is because the density of air is lower than that of water. Based on this design, air can enter the first water outlet pipe 3 from the upper side of the first water outlet pipe 3 and remain in the upper end of the first water outlet pipe 3, and it is not easy to be discharged directly from the first water outlet pipe 3. By continuously blowing air into the first water outlet pipe 3, the space for water can be better occupied and the water can be gradually discharged from the first water outlet pipe 3.

[0047] like Figure 3 In order to allow the water purification device to produce hot water and also to remove residual hot water, the box-shaped drinking water purification device designed by the present application also includes a second front pipe 8, a heater 9, a second automatic water valve 10, a second water outlet pipe 11 and a second conduit 12.

[0048] The second front pipe 8, the second automatic water valve 10 and the second water outlet pipe 11 are connected in sequence. The second front pipe 8 is connected to the end of the water purification mechanism. The heater 9 is installed on the second front pipe 8 and is used to heat the purified water. The heater 9 can be a heat exchanger.

[0049] One end of the second conduit 12 is connected to the end of the empty cylinder 6, and the other end of the second conduit 12 is connected to the second outlet pipe 11 and connected to one end of the second automatic water valve 10. The maximum volume of the empty cylinder 6 is greater than the sum of the volumes of the first outlet pipe 3 and the second outlet pipe 11. The empty cylinder 6 can be cylindrical, and a limit ring is provided at the inlet end to prevent the piston 5 from being pulled out during use. When the piston 5 abuts against the limit ring, the piston 5 is at the position farthest from the end of the empty cylinder 6.

[0050] After the hot water pipeline is added, the residual water at the ends of the cold and hot water pipelines is still removed through the original combination of the expansion joint 4, the piston 5 and the empty cylinder 6, which reduces the number of components and reduces the manufacturing cost.

[0051] In order to improve the efficiency of removing the residual water in the second water outlet pipe 11, a preferred embodiment is to set the other end of the second conduit 12 to be connected to the upper side of the end of the second water outlet pipe 11 connected to the second automatic water valve 10. The air discharged from the second conduit 12 can directly enter the upper side of the second water outlet pipe 11. Compared with entering the second water outlet pipe 11 from the bottom, this structure makes it difficult for the air to float in the water, reducing the disturbance of the air. By default, the outlet of the second water outlet pipe 11 is vertically downward or inclined downward. It is preferred that the end of the second water outlet pipe 11 connected to the second automatic water valve 10 is higher than its outlet end, so that the air has a high efficiency in displacing the water in the second water outlet pipe 11 and the drainage is relatively clean.

[0052] In order to accurately control the direction of the airflow, a preferred embodiment is to design the box-shaped drinking water purification device to further include a first automatic air valve 13 and a second automatic air valve 14. The first automatic air valve 13 is installed on the first conduit 7. The second automatic air valve 14 is installed on the second conduit 12.

[0053] When there is residual water in the first water outlet pipe 3 or the second water outlet pipe 11, if the first automatic air valve 13 and the second automatic air valve 14 are not provided, then when there is residual water in the first water outlet pipe 3 or the second water outlet pipe 11, the water pipe with residual water has a large resistance to gas, and the water pipe without residual water has a small resistance to gas. The gas discharged from the empty cylinder 6 exhausts the two water pipes at the same time, and the gas is easily discharged from the water pipe without residual water, so that the residual water in the water pipe with residual water cannot be discharged well. The above embodiment can close the air valve on the pipeline without residual water by providing the first automatic air valve 13 and the second automatic air valve 14, and can accurately control the air discharged from the empty cylinder 6 to flow only into the pipeline with residual water.

[0054] The first automatic water valve 2, the second automatic water valve 10, the first automatic air valve 13 and the second automatic air valve 14 can all be solenoid valves, which can be autonomously controlled to open and close by a controller installed inside the water purification device.

[0055] like Figure 3 In the water purification device, a structure of the water purification mechanism includes a polypropylene fiber cotton filter 15, a granular activated carbon filter 16, a compressed activated carbon filter 17, a water pump 18, a reverse osmosis membrane filter 19 and a post-activated carbon filter 20 which are sequentially connected through a connecting pipe.

[0056] The water purification mechanism further includes a waste pipe 21 and a pressure tank 22. The waste pipe 21 is connected to the reverse osmosis membrane filter 19. The pressure tank 22 is connected to the inlet end of the post-activated carbon filter 20. The outlet end of the post-activated carbon filter 20 is connected to the first front pipe 1 and the second front pipe 8.

[0057] like Figure 4 The water purification device may further include a housing 23, such as Figure 5 The water purification mechanism and other components are installed inside the shell 23.

[0058] The water purification device introduces tap water from the water purification mechanism, and the water pump 18 needs to be turned on. The tap water first passes through the polypropylene fiber cotton filter 15 to filter out large particles of impurities, such as mud and rust, and then passes through the granular activated carbon filter 16 to filter out suspended matter, such as bacteria and viruses. Then it passes through the compressed activated carbon filter 17 to further filter out residual chlorine, organic matter, heavy metals and other harmful substances. The water passes through the reverse osmosis membrane to separate a part of it into pure water, and the other part of dirty water is discharged from the waste pipe 21. The pure water can be stored in the pressure barrel 22, and when using water, it is discharged through the post-activated carbon filter 20. The post-activated carbon filter 20 further filters organic matter in the water to improve the taste.

[0059] If the water purification device can only discharge cold water, that is, the water purification device includes the first water outlet pipe 3 but the heater 9 and the second water outlet pipe 11 are not installed, in the initial state of the water purification device, there is no water in the first water outlet pipe 3, the piston 5 is installed in the empty cylinder 6, and the piston 5 is located at the farthest position from the end of the empty cylinder 6, and the water purification mechanism is connected to the water source.

[0060] The method for discharging residual water in the above water purification device that only discharges cold water can be: when taking water, open the first automatic water valve 2, and the water flows out through the first water outlet pipe 3. After the water is taken, close the first automatic water valve 2, and start the retractor 4 immediately, or wait for several minutes before starting the retractor 4, for example, wait for one minute, two minutes or three minutes, etc., to adapt to the situation that the user repeatedly takes water in a short time, and start the retractor 4 to discharge the residual water after the repeated water taking is completed in a short time. The specific mechanism for discharging residual water is that the retractor 4 drives the piston 5 to move to the end of the empty cylinder 6, and the air in the empty cylinder 6 passes through the first conduit 7 and then enters the end of the first water outlet pipe 3 connected to the first automatic water valve 2, and the air gradually occupies the first water outlet pipe 3, thereby completely discharging the water in the first water outlet pipe 3, excluding some water drops adhering to the inner wall of the first water outlet pipe 3. After drainage, the retractor 4 drives the piston 5 to return to the initial position farthest from the end of the empty cylinder 6, waiting for the next drainage.

[0061] The above method of discharging residual water can automatically discharge the water in the first water outlet pipe 3 of the water purification device that only discharges cold water after water is taken, thereby reducing water residue and reducing the risk of subsequent water being contaminated.

[0062] If the water purification device can output both cold water and hot water, that is, the water purification device includes a first water outlet pipe 3, a heater 9 and a second water outlet pipe 11, the initial state of the water purification device can be set as follows: there is no water in the first water outlet pipe 3 and the second water outlet pipe 11, the piston 5 is installed in the empty cylinder 6, and the piston 5 is located at the farthest position from the end of the empty cylinder 6, and the water purification mechanism is connected to a water source.

[0063] For the above-mentioned water purification device capable of producing hot and cold water, the methods for discharging residual water therefrom include the following three methods: The first method: when taking cold water, close the second automatic water valve 10 and the second automatic air valve 14, open the first automatic water valve 2, and water flows out through the first water outlet pipe 3. After taking water, if the first automatic water valve 2 or the second automatic water valve 10 is not opened again within X minutes after closing the first automatic water valve 2, then open the first automatic air valve 13, start the expansion joint 4, and the expansion joint 4 drives the piston 5 to move to the end of the empty cylinder 6, and air enters the end of the first water outlet pipe 3 connected to the first automatic water valve 2, and gradually squeezes out the water in the first water outlet pipe 3; finally, the expansion joint 4 drives the piston 5 to return to the position farthest from the end of the empty cylinder 6.

[0064] The second method: when removing hot water, close the first automatic water valve 2 and the first automatic air valve 13, open the second automatic water valve 10, and water flows out through the second water outlet pipe 11. After the water is taken out, if the first automatic water valve 2 or the second automatic water valve 10 is not opened again within Y minutes after the second automatic water valve 10 is closed, the second automatic air valve 14 is opened, the expansion device 4 is started, and the expansion device 4 drives the piston 5 to move to the end of the empty cylinder 6, and air enters the second water outlet pipe 11 connected to one end of the second automatic water valve 10, gradually squeezing out the water in the second water outlet pipe 11; finally, the expansion device 4 drives the piston 5 to return to the position farthest from the end of the empty cylinder 6.

[0065] The third method: when taking cold water, open the first automatic water valve 2, and water flows out through the first water outlet pipe 3. After taking water, within X minutes after closing the first automatic water valve 2, open the second automatic water valve 10 to take hot water, and do not start the expansion device 4. Within Y minutes after closing the second automatic water valve 10, do not open the first automatic water valve 2 or the second automatic water valve 10 again. Since there is residual water in the first water outlet pipe 3 and the second water outlet pipe 11 after taking cold water and hot water, the first automatic air valve 13 and the second automatic air valve 14 are opened at the same time, and the expansion device 4 is started. The expansion device 4 drives the piston 5 to move to the end of the empty cylinder 6, and air enters the end of the first water outlet pipe 3 connected to the first automatic water valve 2, and the air also enters the end of the second water outlet pipe 11 connected to the second automatic water valve 10, and gradually squeezes out the water in the first water outlet pipe 3 and the water in the second water outlet pipe 11; finally, the expansion device 4 drives the piston 5 to return to the position farthest from the end of the empty cylinder 6.

[0066] The above hot and cold water purification device can also include a fourth method of discharging residual water, that is, when taking hot water first, the second automatic water valve 10 is opened, and water flows out through the second water outlet pipe 11. After the water is taken, the first automatic water valve 2 is opened to take cold water within Y minutes after the second automatic water valve 10 is closed, and the expansion device 4 is not started. Within X minutes after the first automatic water valve 2 is closed, the second automatic water valve 10 or the first automatic water valve 2 is not opened again. Since there is residual water in the first water outlet pipe 3 and the second water outlet pipe 11 after taking cold water and hot water in a short time, the first automatic air valve 13 and the second automatic air valve 14 are opened at the same time, and then the expansion device 4 is started. The expansion device 4 drives the piston 5 to move to the end of the empty cylinder 6, and the air enters the end of the first water outlet pipe 3 connected to the first automatic water valve 2 and the end of the second water outlet pipe 11 connected to the second automatic water valve 10, gradually squeezing out the water in the first water outlet pipe 3 and the water in the second water outlet pipe 11; finally, the expansion device 4 drives the piston 5 to return to the position farthest from the end of the empty cylinder 6.

[0067] The above hot and cold water purification device may also include the fifth, sixth and seventh methods of discharging residual water. Please refer to the description of the above methods for details. This application is not limited to only three or four methods of discharging residual water.

[0068] For example, the fifth method is an extension of the first method: when taking cold water, close the second automatic water valve 10 and the second automatic air valve 14, open the first automatic water valve 2, and water flows out through the first water outlet pipe 3. After taking water, within X minutes after closing the first automatic water valve 2, open the first automatic water valve 2 again to take cold water, and within X minutes after the last opening of the first automatic air valve 13, if the first automatic water valve 2 or the second automatic water valve 10 is not opened again, the expansion device 4 is started, and the expansion device 4 drives the piston 5 to move to the end of the empty cylinder 6, and air enters the end of the first water outlet pipe 3 connected to the first automatic water valve 2, gradually squeezing out the water in the first water outlet pipe 3; finally, the expansion device 4 drives the piston 5 to return to the position farthest from the end of the empty cylinder 6.

[0069] In the structure where the water purification device has both cold and hot water outlet pipes, the above method of discharging residual water is set for a variety of water use conditions, and corresponding procedures are set to remove the residual water. The steps are reasonably designed, with low processing costs, and can basically remove the residual water in the two pipes.

[0070] In a preferred embodiment, X=Y, for example, 1 min, 2 min or 3 min, etc. The preferred method has a relatively simple control process for discharging residual water, has a relatively balanced effect on discharging residual water with double pipes, and can basically discharge all residual water.

[0071] By adopting the above method, after taking water from the box-shaped drinking water purification device, there will be basically no residual water in the first water outlet pipe 3 and the second water outlet pipe 11. When taking water next time, there will be basically no problem of residual water contaminating the newly produced water. The newly produced water has a higher degree of cleanliness, and there will be basically no residual water mixed in the newly produced hot water. The temperature of the newly produced hot water is basically not affected by the residual water.

[0072] Although the present application has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the structures or components therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A box-shaped drinking water purification device, characterized in that: It comprises a water purification mechanism, a first front pipe (1), a first automatic water valve (2) and a first water outlet pipe (3) which are connected in sequence, and also comprises an expansion joint (4), a piston (5), an empty cylinder (6) and a first conduit (7); The retractor (4) is connected to the piston (5), and the piston (5) is installed in the hollow cylinder (6); one end of the first conduit (7) is seamlessly connected to the end of the hollow cylinder (6); the retractor (4) can drive the piston (5) to move back and forth along the hollow cylinder (6), so that the piston (5) abuts against or moves away from the end of the hollow cylinder (6), and the piston (5) maintains seamless contact with the hollow cylinder (6) during the movement process; the other end of the first conduit (7) is connected to one end of the first water outlet pipe (3) connected to the first automatic water valve (2); the maximum volume of the hollow cylinder (6) is greater than the volume of the first water outlet pipe (3).

2. The box-shaped drinking water purification device according to claim 1, characterized in that: The other end of the first conduit (7) is connected to the upper side of one end of the first water outlet pipe (3) connected to the first automatic water valve (2).

3. The box-shaped drinking water purification device according to claim 1 or 2, characterized in that: The box-shaped drinking water purification device further comprises a second front pipe (8), a heater (9), a second automatic water valve (10), a second water outlet pipe (11) and a second conduit (12); The second front pipe (8), the second automatic water valve (10) and the second water outlet pipe (11) are connected in sequence; the second front pipe (8) is connected to the water purification mechanism; the heater (9) is installed on the second front pipe (8); One end of the second conduit (12) is connected to the end of the hollow cylinder (6), and the other end of the second conduit (12) is connected to one end of the second water outlet pipe (11) connected to the second automatic water valve (10); the maximum volume of the hollow cylinder (6) is greater than the sum of the volumes of the first water outlet pipe (3) and the second water outlet pipe (11).

4. The box-shaped drinking water purification device according to claim 3, characterized in that: The other end of the second conduit (12) is connected to the upper side of one end of the second water outlet pipe (11) connected to the second automatic water valve (10).

5. The box-shaped drinking water purification device according to claim 3, characterized in that: The box-shaped drinking water purification device further comprises a first automatic air valve (13) and a second automatic air valve (14); the first automatic air valve (13) is mounted on the first conduit (7); and the second automatic air valve (14) is mounted on the second conduit (12).

6. The box-shaped drinking water purification device according to claim 3, characterized in that: The water purification mechanism comprises a polypropylene fiber cotton filter (15), a granular activated carbon filter (16), a compressed activated carbon filter (17), a water pump (18), a reverse osmosis membrane filter (19) and a post-activated carbon filter (20) which are sequentially connected via a connecting pipe; The water purification mechanism further comprises a waste discharge pipe (21) and a pressure barrel (22); the waste discharge pipe (21) is connected to the reverse osmosis membrane filter (19); the pressure barrel (22) is connected to the inlet end of the post-activated carbon filter (20); and the outlet end of the post-activated carbon filter (20) is connected to the first front pipe (1) and the second front pipe (8).

7. A method for discharging residual water, the method for discharging residual water at the water outlet of the box-shaped drinking water purification device according to any one of claims 1 to 6, characterized in that: In an initial state, there is no water in the first water outlet pipe (3), the piston (5) is installed in the empty cylinder (6), and the piston (5) is located at a position farthest from the end of the empty cylinder (6), and the water purification mechanism is connected to a water source; The method comprises: opening the first automatic water-flowing valve (2), allowing water to flow out through the first water outlet pipe (3); closing the first automatic water-flowing valve (2), starting the retractor (4), the retractor (4) driving the piston (5) to move to the end of the empty cylinder (6), allowing air to enter the first water outlet pipe (3) connected to one end of the first automatic water-flowing valve (2), gradually displacing the water in the first water outlet pipe (3); and finally the retractor (4) driving the piston (5) to return to the position farthest from the end of the empty cylinder (6).

8. A method for discharging residual water, the method for discharging residual water at the water outlet of the box-shaped drinking water purification device according to claim 5, characterized in that: In an initial state, there is no water in the first water outlet pipe (3) and the second water outlet pipe (11), the piston (5) is installed in the empty cylinder (6), and the piston (5) is located at a position farthest from the end of the empty cylinder (6), and the water purification mechanism is connected to a water source; The method includes the following three methods: The first method: closing the second automatic water-passing valve (10) and the second automatic air-passing valve (14); opening the first automatic water-passing valve (2), and allowing water to flow out through the first water outlet pipe (3); within X minutes after closing the first automatic water-passing valve (2), if the first automatic water-passing valve (2) or the second automatic water-passing valve (10) is not opened again, then opening the first automatic air-passing valve (13), starting the retractor (4), and the retractor (4) driving the piston (5) to move to the end of the empty cylinder (6), allowing air to enter the first water outlet pipe (3) connected to one end of the first automatic water-passing valve (2), and gradually displacing the water in the first water outlet pipe (3); finally, the retractor (4) drives the piston (5) to return to the position farthest from the end of the empty cylinder (6); The second method: close the first automatic water-passing valve (2) and the first automatic air-passing valve (13); open the second automatic water-passing valve (10), and water flows out through the second water outlet pipe (11); if the first automatic water-passing valve (2) or the second automatic water-passing valve (10) is not opened again within Y minutes after the second automatic water-passing valve (10) is closed, then open the second automatic air-passing valve (14), start the expansion joint (4), and the expansion joint (4) drives the piston (5) to move to the end of the empty cylinder (6), and air enters the second water outlet pipe (11) connected to one end of the second automatic water-passing valve (10), gradually discharging the water in the second water outlet pipe (11); finally, the expansion joint (4) drives the piston (5) to return to the position farthest from the end of the empty cylinder (6); The third method: the first automatic water-passing valve (2) is opened, and water flows out through the first water outlet pipe (3); within X minutes after the first automatic water-passing valve (2) is closed, the second automatic water-passing valve (10) is opened again, and the expansion device (4) is not started; within Y minutes after the second automatic water-passing valve (10) is closed, if the first automatic water-passing valve (2) or the second automatic water-passing valve (10) is not opened again, the first automatic air-passing valve (13) and the second automatic air-passing valve (14) are opened, and the expansion device (4) is started. (4), the retractor (4) drives the piston (5) to move to the end of the empty cylinder (6), and air enters the first water outlet pipe (3) connected to one end of the first automatic water valve (2), and air also enters the second water outlet pipe (11) connected to one end of the second automatic water valve (10), gradually squeezing out the water in the first water outlet pipe (3) and the water in the second water outlet pipe (11); finally, the retractor (4) drives the piston (5) to return to the position farthest from the end of the empty cylinder (6).

9. The method for discharging residual water according to claim 8, characterized in that: X=Y.

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