Water drinking device and control method thereof

Abstract

The embodiment of the invention discloses a water drinking device and a control method thereof. The water drinking device comprises an instant heating pipeline, a cold water pipeline and a backflow pipeline. The cold water pipeline comprises a cold tank and a cold tank water outlet pipe; the cold tank water outlet pipe is communicated with a water outlet of the cold tank; the backflow pipeline is arranged in the shell, communicates with the instant heating pipeline and the cold tank and is used for enabling hot water of the instant heating pipeline to flow back into the cold tank when the cold tank is sterilized, the hot water can be discharged out of the cold tank water outlet pipe so as to sterilize the cold tank and the cold tank water outlet pipe, and then the probability that bacteria breed in the cold tank and the cold tank water outlet pipe can be reduced; and reliable guarantee is provided for drinking water health of users.

Description

Technical Field

[0001] The present application relates to the field of household appliance technology, and in particular to a drinking water device and a control method thereof. Background Art

[0002] In the relevant technical field, drinking water devices often cool room temperature water through a cold tank, and when the user takes cold water, the cold tank transports cold water to the cold water outlet, so that the user can take cold water at the cold water outlet. However, since the cold water is stored in the cold tank, impurities in the water will also be deposited in the cold tank. Over time, it becomes a breeding ground for bacteria, which can easily affect the user's health. Summary of the invention

[0003] The embodiment of the present application provides a drinking water device and a control method thereof, which is intended to enable the hot water in the instant heating pipeline to flow back into the cold tank and be discharged from the cold tank water outlet pipe to sterilize the cold tank and the cold tank water outlet pipe, thereby reducing the probability of bacteria growing in the cold tank and the cold tank water outlet pipe, thereby providing reliable protection for the user's drinking water health.

[0004] An embodiment of the present application provides a drinking water device, including an instant heating pipeline, a cold water pipeline and a return pipeline; the cold water pipeline includes a cold tank and a cold tank water outlet pipe, and the cold tank water outlet pipe is connected to the water outlet of the cold tank; the return pipeline is connected to both the instant heating pipeline and the cold tank, and is used to return the hot water in the instant heating pipeline to the cold tank when sterilizing the cold tank, and can be discharged from the cold tank water outlet pipe to sterilize the cold tank and the cold tank water outlet pipe.

[0005] In some embodiments, the cold water pipeline also includes a cold water pump and a cold tank water outlet valve; the cold water pump is arranged on the cold tank water outlet pipe; the cold tank water outlet valve is arranged on the cold tank water outlet pipe and is arranged on the side of the cold water pump away from the cold tank.

[0006] In some of the embodiments, the cold water pipeline also includes a cold tank water inlet pipe and a cold tank water inlet valve, the cold tank water inlet pipe is connected to the water inlet of the cold tank and to the return pipeline; the cold tank water inlet valve is arranged on the cold tank water inlet pipe; the return pipeline is connected to the side of the cold tank water inlet valve close to the cold tank; wherein, when the cold water pipeline is sterilized, the return pipeline is opened and the cold tank water inlet valve is closed, that is, the hot water in the hot pipeline enters the cold tank via the return pipeline and the cold tank water inlet pipe.

[0007] In some of the embodiments, the cold water pipeline further includes a second water temperature detection component, which is disposed in the cold tank and is used to detect the water temperature of the water in the cold tank.

[0008] In some of the embodiments, the cold water pipeline further includes a water level detection component, which is disposed in the cold tank and is used to detect the water level in the cold tank; wherein the water level detection component includes at least one of a water level probe, a water level float and a Hall element.

[0009] In some embodiments, the drinking water device also includes a main water inlet pipe and a first flow meter. The main water inlet pipe is connected to the instant heating pipeline and the cold water pipeline for supplying water to the instant heating pipeline and the cold water pipeline. The first flow meter is arranged on the main water inlet pipe.

[0010] In some embodiments, the cold water pipeline also includes a cold tank water outlet pipe and a second flow meter, and the cold tank water outlet pipe is connected to the water outlet of the cold tank; the second flow meter is arranged on the cold tank water outlet pipe, and is used to cooperate with the first flow meter to detect the water level in the cold tank.

[0011] In some of the embodiments, the cold water pipeline further includes an exhaust pipe, which is connected to the cold tank and is used to connect the cold tank and the atmosphere.

[0012] In some of the embodiments, the cold water pipeline further includes an exhaust valve, which is disposed on the exhaust pipe and is used to control the opening and closing of the exhaust pipe.

[0013] In some embodiments, the return pipeline includes a return water pipe, which is connected to the heating pipeline and the cold tank; the first control valve is arranged on the return water pipe; wherein, when the cold tank is sterilized, the first control valve is opened, and the hot water in the heating pipeline enters the cold tank via the return water pipe.

[0014] In some embodiments, the instant heating pipeline also includes an instant heating pipe, an instant heating water outlet pipe and a second control valve. The water inlet of the instant heating pipe is used to connect to normal temperature water, and the water outlet of the instant heating pipe is connected to the return water pipe; the instant heating water outlet pipe is connected to the water outlet of the instant heating pipe; the second control valve is arranged on the instant heating water outlet pipe, and when the cold can is sterilized, the first control valve is opened and the second control valve is closed.

[0015] In some embodiments, the first control valve and the second control valve are integrally a three-way control valve, or the first control valve and the second control valve are different control valves.

[0016] In some embodiments, the heating pipe further includes a first water temperature detection component, which is disposed at the water outlet of the heating pipe and is used to detect the water temperature at the water outlet of the heating pipe.

[0017] In some embodiments, the instant heating pipeline also includes an instant heating water inlet pipe, an instant heating water inlet valve and a hot water pump, the instant heating water inlet pipe is connected to the water inlet of the instant heating pipe; the instant heating water inlet valve is arranged on the instant heating water inlet pipe; the hot water pump is arranged on the instant heating water inlet pipe, and is arranged on the side of the instant heating water inlet valve close to the instant heating pipe.

[0018] In some embodiments, the instant heating pipeline further includes a pressure reducing valve, which is disposed on the instant heating water inlet pipe and between the instant heating water inlet valve and the hot water pump.

[0019] The present application also provides a control method applicable to a drinking water device, the control method comprising:

[0020] When the first sterilization condition is met, obtaining the water level in the cold tank;

[0021] When the water level in the cold tank is not higher than the first preset water level, the instant heating pipeline is controlled to work, and the return pipeline is controlled to return the hot water in the instant heating pipeline to the cold tank to sterilize the cold water pipeline.

[0022] In some embodiments, the instant heating pipeline includes an instant heating pipe, an instant heating water inlet pipe and an instant heating water outlet pipe, the instant heating water inlet pipe is connected to the water inlet of the instant heating pipe, the instant heating water outlet pipe is connected to the water outlet of the instant heating pipe, and the return pipeline includes a return water pipe, the return water pipe is connected to the water outlet of the instant heating pipe and the cold tank;

[0023] When the water level in the cold tank is not higher than the first preset water level, the steps of controlling the instant heating pipeline to work and controlling the return pipeline to return the hot water in the instant heating pipeline to the cold tank to sterilize the cold water pipeline include:

[0024] When the water level in the cold tank is not higher than the first preset water level, the hot water outlet pipe is controlled to be closed, and the return water pipe is controlled to be opened;

[0025] The instant heating water inlet pipe is controlled to open, and the instant heating pipe is controlled to work, so that hot water with a first preset water temperature can enter the cold tank through the return water pipe to sterilize the cold tank.

[0026] In some embodiments, the drinking water device further comprises a three-way control valve, a first valve port of the three-way control valve is connected to the water outlet of the instant heating pipe, a second valve port of the three-way control valve is connected to the return water pipe, and a third valve port of the three-way control valve is connected to the instant heating water outlet pipe;

[0027] When the water level in the cold tank is not higher than the first preset water level, the steps of controlling the instant hot water outlet pipe to close and controlling the return water pipe to open include:

[0028] When the water level in the cold tank is not higher than the first preset water level, the three-way control valve is controlled to connect the water outlet of the heating pipe with the return water pipe.

[0029] In some embodiments, the step of controlling the instant heating water inlet pipe to open and controlling the instant heating pipe to operate so that hot water at the outlet of the instant heating pipe can enter the cold tank via the return pipe to sterilize the cold tank includes:

[0030] When the water level in the cold tank is not lower than the second preset water level, the instant heating water inlet pipe is controlled to be closed, the instant heating pipe is controlled to stop heating, and the return water pipe is controlled to be closed;

[0031] The second preset water level is higher than the first preset water level.

[0032] In some embodiments, the cold water pipeline further includes a cold tank water outlet pipe, which is connected to the water outlet of the cold tank; when the water level in the cold tank is not lower than the second preset water level, after the steps of controlling the instant heating water inlet pipe to close, controlling the instant heating pipe to stop heating, and controlling the return water pipe to close, the steps further include:

[0033] When the second sterilization condition is met, the cold tank water outlet pipe is controlled to open, and the hot water of the cold tank is discharged through the cold tank water outlet pipe to sterilize the cold tank water outlet pipe;

[0034] Among them, the second sterilization condition includes that the water temperature of the hot water in the cold tank is reduced to a second preset water temperature, the second preset water temperature is lower than the first preset water temperature, and / or the water level of the cold tank is at the second preset water level for a preset sterilization time.

[0035] In some embodiments, the cold water pipeline further includes a cold tank water outlet pipe, which is connected to the water outlet of the cold tank. When the water level in the cold tank is not higher than the first preset water level, the instant heating pipeline is controlled to work, and the return pipeline is controlled to return the hot water in the instant heating pipeline to the cold tank to sterilize the cold water pipeline. Before the step, the method further includes:

[0036] When the water level in the cold tank is higher than a first preset water level, the cold tank water outlet pipe is controlled to open, so that the water in the cold tank is discharged through the cold tank water outlet pipe; or,

[0037] The cold water pipeline also includes a drain pipe, which is connected to the drain port of the cold tank. When the water level in the cold tank is not higher than the first preset water level, the instant heating pipeline is controlled to work, and the return pipeline is controlled to return the hot water in the instant heating pipeline to the cold tank to sterilize the cold water pipeline. Before the step, the method further includes:

[0038] When the water level in the cold tank is higher than the first preset water level, the drain pipe is controlled to open, and the water in the cold tank is discharged through the drain pipe.

[0039] Based on the drinking water device of the present application, when sterilizing the cold tank, the hot water in the instant heating pipeline can flow back into the cold tank and can be discharged from the cold tank water outlet pipe to sterilize the cold tank and the cold tank water outlet pipe, thereby reducing the probability of bacteria growing in the cold tank and the cold tank water outlet pipe, thereby providing reliable protection for the user's drinking health.

[0040] And because the present application uses instant heating pipes, room temperature water can be heated into hot water when it flows through the instant heating pipes. Compared with the solution of using a hot tank to heat room temperature water, the instant heating pipes can have a higher heating efficiency. Therefore, when sterilizing cold water pipes, the time it takes for room temperature water to be heated into hot water can be reduced, thereby improving the sterilization efficiency of cold water pipes. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0042] Figure 1 This is a schematic diagram of the structure of a drinking water device in one embodiment of the present application;

[0043] Figure 2 This is a schematic diagram of the water circuit structure of a drinking water device in one embodiment of the present application;

[0044] Figure 3 This is a flow chart of a control method for a drinking water device in one embodiment of the present application;

[0045] Figure 4 This is a flow chart of a control method for a drinking water device in another embodiment of the present application;

[0046] Figure 5 This is a flow chart of a control method for a drinking water device in another embodiment of the present application;

[0047] Figure 6 This is a flow chart of a control method for a drinking water device in another embodiment of the present application;

[0048] Figure 7 This is a flow chart of a control method for a drinking water device in another embodiment of the present application;

[0049] Figure 8 This is a flow chart of a control method for a drinking water device in another embodiment of the present application;

[0050] Fig. 9 This is a flow chart of a control method for a drinking water device in another embodiment of the present application.

[0051] Description of the reference numerals: 1, drinking water device; 11, housing; 12, instant heating pipeline; 120, instant heating pipe; 121, instant heating water outlet pipe; 122, second control valve; 123, first water temperature detection member; 124, instant heating water inlet pipe; 125, instant heating water inlet valve; 126, hot water pump; 127, pressure reducing valve; 13, cold water pipeline; 130, cold tank; 131, cold tank water inlet pipe; 132, cold tank water inlet valve ; 133, cold tank outlet pipe; 134, cold water pump; 135, cold tank outlet valve; 136, second water temperature detection component; 137, water level detection component; 138, exhaust pipe; 14, reflux pipeline; 140, reflux water pipe; 141, first control valve; 15, three-way control valve; 16, main water inlet pipe; 160, first flow meter; 17, normal temperature water pipeline; 171, normal temperature water valve; 18, one-way valve. DETAILED DESCRIPTION

[0052] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0053] Please refer to Figure 1 and Figure 2 An embodiment of the present application provides a drinking water device 1, including a housing 11, a filtering system (not shown in the figure), a hot water pipeline 12, a cold water pipeline 13 and a normal temperature water pipeline 17.

[0054] The filter system, the heating pipe 12, the cold water pipe 13 and the normal temperature water pipe 17 are all arranged in the shell 11, so as to use the shell 11 to protect the filter system, the heating pipe 12, the cold water pipe 13 and the normal temperature water pipe 17, thereby reducing the probability of damage to the filter system, the heating pipe 12, the cold water pipe 13 and the normal temperature water pipe 17, so that the drinking water device 1 can have a longer service life. It is understood that the shell 11 can be made of metal or plastic. In other embodiments, the shell 11 can also be made of other materials. In the embodiment of the present application, the material of the shell is not limited. It is understood that the shape of the shell 11 can be a cube, a cylinder or a sphere. In other embodiments, the shell 11 can also be other shapes. In the embodiment of the present application, the shape of the shell 11 is not limited.

[0055] The filtration system is connected to the water pipe, and the filtration system includes a filter element, a booster pump, and a water inlet solenoid valve. The booster pump and the solenoid valve are electrically connected to the controller. When the controller detects a signal for taking normal temperature water or a signal for taking hot water or a water replenishment signal from the cold water pipeline 13, it can control the filtration system to start water production. When the signal disappears, the controller controls the filtration system to stop water production and enter a standby state. The normal temperature water at the outlet of the filtration system can enter the instant hot water pipeline 12, the cold water pipeline 13, and the normal temperature water pipeline 17, so that the user can obtain hot water from the hot water outlet, cold water from the cold water outlet, and normal temperature water from the normal temperature water outlet.

[0056] Exemplarily, the filtration system may include a plurality of filter elements, and the plurality of filter elements may be independently arranged or integrated into a composite filter element.

[0057] Exemplarily, the filtration system may include an inlet valve, a first filter element, a second filter element, a booster pump and a one-way valve, the water inlet end of the inlet valve being connected to the raw water inlet, the water outlet end of the inlet valve being connected to the water inlet end of the first filter element, the water outlet end of the first filter element being connected to the water inlet end of the booster pump, the water outlet end of the booster pump being connected to the water inlet end of the second filter element, the water outlet end of the second filter element being connected to the water inlet end of the one-way valve, and the water outlet end of the one-way valve being connected to the water outlet end of the filtration system.

[0058] The first filter element is used to achieve preliminary filtration of raw water, and can filter out large particles such as mud, rust, insect eggs, and red worms in the raw water. The raw water can be tap water, well water, etc. The first filter element can be a PP cotton filter element (polypropylene melt-blown filter element), a carbon rod filter element, a composite filter element, etc.

[0059] The second filter element has a reverse osmosis membrane, which can be an artificial semi-permeable membrane. The pore size of the reverse osmosis membrane is very small, and it can effectively remove impurities such as dissolved salts, colloids, microorganisms, organic matter, etc. in water.

[0060] The second filter element is connected with a waste water pipe, and a waste water valve is arranged on the waste water pipe for controlling the discharge of waste water.

[0061] In other embodiments, the filtration system may further include a third filter element, a water inlet end of the third filter element is connected to a water outlet end of the second filter element, and a water outlet end of the third filter element is connected to a water outlet end of the filtration system.

[0062] The third filter element is used to absorb odor and residual chlorine, and can be used to improve the taste of normal temperature water. The third filter element can be an activated carbon filter element.

[0063] The water inlet of the heating pipe 12 is connected to the water outlet of the filtering system, and the water outlet of the heating pipe 12 is connected to the hot water outlet, so that when the user takes hot water, the filtering system starts to make water, or the water stored in the pure water tank enters the heating pipe 12, and the heating pipe 12 heats the room temperature water and transports it to the hot water outlet, so that the user can take hot water.

[0064] The water inlet of the cold water pipe 13 is connected to the water outlet of the filtration system, and the water outlet of the cold water pipe 13 is connected to the cold water outlet. Normal temperature water can be cooled through the cold water pipe 13 and transported to the cold water outlet when the user takes cold water, so that the user can take cold water.

[0065] The water inlet of the normal temperature water pipeline 17 is connected to the water outlet of the filtration system, and the water outlet of the normal temperature water pipeline 17 is connected to the normal temperature water outlet, so that the normal temperature water filtered by the filtration system can enter the normal temperature water pipeline 17. It can be understood that a normal temperature water valve 171 is provided on the normal temperature water pipeline 17. When the user takes the normal temperature water, the normal temperature water valve 171 is opened, and the normal temperature water pipeline 17 is connected, so that the user can take the normal temperature water at the normal temperature water outlet.

[0066] Please refer to Figure 1 and Figure 2 In the related art, the cold water pipeline 13 often includes a cold tank 130. Normal temperature water enters the cold tank 130 for cooling. When the user takes cold water, the cold tank 130 transports cold water to the cold water outlet, so that the user can take cold water at the cold water outlet. However, since the cold water is stored in the cold tank 130, impurities in the water will also be deposited in the cold tank 130. Over time, it becomes a breeding ground for bacteria, which can easily affect the health of the user.

[0067] Please refer to Figure 1 and Figure 2 In one embodiment, the drinking water device 1 also includes a return pipe 14, which is connected to the instant heating pipe 12 and the cold tank 130. When the cold tank 130 is sterilized, the hot water in the instant heating pipe 12 can be returned to the cold tank 130 to sterilize the cold water pipe 13, thereby reducing the probability of bacteria growing in the cold water pipe 13, thereby providing reliable protection for the user's drinking health.

[0068] And because the present application uses the instant heating pipe 12, when normal temperature water flows through the instant heating pipe 12, it can be heated into hot water. Compared with the solution of using a hot tank to heat normal temperature water, the instant heating pipe 12 can have a higher heating efficiency. Therefore, when sterilizing the cold water pipe 13, the time for normal temperature water to be heated into hot water can be reduced, thereby improving the sterilization efficiency of the cold water pipe 13.

[0069] Please refer to Figure 1 and Figure 2 In one embodiment, the return pipe 14 includes a return water pipe 140 and a first control valve 141 . The return water pipe 140 is connected to both the instant heating pipe 12 and the cold tank 130 . The first control valve 141 is disposed on the return water pipe 140 .

[0070] When the cold tank 130 needs to be sterilized, the controller can control the first control valve 141 to open, so that the hot pipe 12 and the cold tank 130 are connected through the return pipe 14, that is, the hot water in the hot pipe 12 enters the cold tank 130 through the return water pipe 140, and then the cold tank 130 can be sterilized with hot water.

[0071] Please refer to Figure 1 and Figure 2 In order to further improve the sterilization efficiency of the cold tank 130, the hot water pipeline 12 also includes a hot water pipe 120, a hot water outlet pipe 121 and a second control valve 122. The water inlet of the hot water pipe 120 is used to connect to normal temperature water, and the water outlet of the hot water pipe 120 is connected to the reflux water pipe 140; the hot water outlet pipe 121 is connected to the water outlet of the hot water pipe 120; the second control valve 122 is arranged on the hot water outlet pipe 121.

[0072] When the cold tank 130 needs to be sterilized, the second control valve 122 can be controlled to be closed first, and the first control valve 141 can be controlled to be opened, and then the normal temperature water can be controlled to flow through the instant heating pipe 120 to be heated into hot water, and the hot water enters the cold tank 130 through the return water pipe 140, so that the cold tank 130 can be sterilized. And because the second control valve 122 is closed, the instant heating water outlet pipe 121 is in a closed state, so that all the hot water can flow to the cold tank 130, and then the water volume in the cold tank 130 can be increased, and the contact area between the water in the cold tank 130 and the inner wall of the cold tank 130 is increased, so as to improve the sterilization efficiency of the hot water sterilizing the cold tank 130.

[0073] And because the instant heating pipe 120 is used to heat the normal temperature water in real time, the normal temperature water can be heated into hot water when it flows through the instant heating pipe 12. Compared with the solution of using a hot tank to heat normal temperature water, the instant heating pipe 12 can have a higher heating efficiency. Therefore, when sterilizing the cold water pipe 13, the time for the normal temperature water to be heated into hot water can be reduced, thereby improving the sterilization efficiency of the cold water pipe 13.

[0074] Please refer to Figure 1 and Figure 2 In another embodiment, the first control valve 141 and the second control valve 122 can be integrated into a three-way control valve 15.

[0075] Please refer to Figure 1 and Figure 2 Specifically, the first valve port of the three-way control valve 15 is connected to the outlet of the instant heating pipe 120, the second valve port of the three-way control valve 15 is connected to the return water pipe 140, and the third valve port of the three-way control valve 15 is connected to the instant heating outlet pipe 121. The three-way control valve 15 can make the first valve port and the second valve port conductive, or make the first valve port and the third valve port conductive. When the user receives hot water from the hot water outlet, the first valve port and the third valve port of the three-way control valve 15 are conductive, so that the normal temperature water can be heated to hot water through the instant heating pipe 120, and the hot water can flow out through the instant heating outlet pipe 121 and the hot water outlet. When the cold tank 130 needs to be sterilized with hot water, the three-way valve can switch the conductive state so that the first valve port and the second valve port are conductive, and the first valve port and the second valve port are closed.

[0076] Please refer to Figure 1 and Figure 2In one embodiment, the heating pipe 12 further includes a first water temperature detecting component 123, which is disposed at the water outlet of the heating pipe 120. The first water temperature detecting component 123 is used to detect the water temperature at the water outlet of the heating pipe 120, so that the heating pipe 120 can adjust the hot water temperature of the heating pipe 120 according to the user's demand for hot water and the sterilization demand of the cold tank 130, thereby meeting the user's demand for hot water temperature and the sterilization water temperature demand of the cold tank 130.

[0077] Please refer to Figure 1 and Figure 2 It is understandable that a water inlet temperature detection member may be provided at the water inlet of the instant heating pipe 120, and the water inlet temperature detection member is used to detect the water temperature of the water inlet of the instant heating pipe 120, so that the heating power of the instant heating pipe 120 can be adjusted according to the water temperature of the water inlet of the instant heating pipe 120. For example, in winter, the water temperature of the normal temperature water is relatively low, and the water inlet temperature detection member detects that the water temperature of the water inlet of the instant heating pipe 120 is relatively low. At this time, under the condition that the length of the instant heating pipe 120 is the same, the power of the instant heating pipe 120 can be increased to ensure that within the same time period, the heating pipe can heat the normal temperature water into hot water that meets the user's water temperature requirements for taking hot water and the sterilization water temperature requirements of the cold tank 130, thereby improving the heating efficiency of the instant heating pipe 120 and reducing the waiting time of the user; it is also possible to shorten the preparation time of hot water during the sterilization process of the cold tank 130 to improve the sterilization efficiency of the cold tank 130 using hot water.

[0078] Please refer to Figure 1 and Figure 2 In one embodiment, the instant hot water pipeline 12 also includes an instant hot water inlet pipe 124, an instant hot water inlet valve 125 and a hot water pump 126. The water inlet of the instant hot water inlet pipe 124 is connected to the water outlet of the filtration system, and the water outlet of the instant hot water inlet pipe 124 is connected to the water inlet of the instant hot water pipe 120; the instant hot water inlet valve 125 is arranged on the instant hot water inlet pipe 124; the hot water pump 126 is arranged on the instant hot water inlet pipe 124, and is arranged on the side of the instant hot water inlet valve 125 close to the instant hot water pipe 120.

[0079] When it is necessary to heat the room temperature water, the controller controls the instant heating water inlet valve 125 to open, and controls the hot water pump 126 and the instant heating pipe 120 to work. The hot water pump 126 drives the room temperature water in the instant heating water inlet pipe 124 to move toward the instant heating pipe 120 until the room temperature water enters the instant heating pipe 120 and is heated into hot water through the heating pipe.

[0080] Please refer to Figure 1 and Figure 2In one embodiment, the instant heating pipe 12 further includes a pressure reducing valve 127, which is disposed on the instant heating water inlet pipe 124 and between the instant heating water inlet valve 125 and the hot water pump 126. The pressure reducing valve 127 can reduce the pressure of the normal temperature water in the instant heating water inlet pipe 124, and further reduce the flow rate of the normal temperature water in the instant heating water inlet pipe 124, so that the flow rate of the water in the instant heating pipe 120 is slower, so that the instant heating pipe 120 heats the water flowing therein into hot water, and the accuracy of the water temperature control by the instant heating pipe 120 can be improved.

[0081] Please refer to Figure 1 and Figure 2 In one embodiment, the cold water pipeline 13 also includes a hot water pipeline 131 and a cold tank water inlet valve 132, the hot water pipeline 131 is connected to the water inlet of the cold tank 130 and to the return pipeline 14; the cold tank water inlet valve 132 is arranged on the hot water pipeline 131; the return pipeline 14 is connected to the side of the cold tank water inlet valve 132 close to the cold tank 130.

[0082] When sterilizing the cold water pipeline 13, the return pipeline 14 is opened, the cold tank water inlet valve 132 is closed, and the hot water in the hot pipeline 12 enters the cold tank 130 via the return pipeline 14 and the hot pipeline 131, so that the hot water can be used to sterilize the hot pipeline 131 and the cold tank 130.

[0083] Please refer to Figure 1 and Figure 2 In one embodiment, the cold water pipeline 13 also includes a cold tank water outlet pipe 133, a cold water pump 134 and a cold tank water outlet valve 135. The cold tank water outlet pipe 133 is connected to the water outlet of the cold tank 130 and is connected to the cold water outlet; the cold water pump 134 is arranged on the cold tank water outlet pipe 133; the cold tank water outlet valve 135 is arranged on the cold tank water outlet pipe 133 and is arranged on the side of the cold water pump 134 away from the cold tank 130.

[0084] When the user needs to take cold water, the cold water outlet valve is controlled to open, and the cold water pump 134 is controlled to work, so that the cold water in the cold tank 130 passes through the outlet of the cold tank 130 and is pumped out from the cold water outlet, so that the user can take cold water at the cold water outlet.

[0085] Please refer to Figure 1 and Figure 2 In one embodiment, the cold water pipeline 13 also includes a second water temperature detection component 136, which is arranged in the cold tank 130 and is used to detect the water temperature of the water in the cold tank 130, so that the water temperature of the water in the cold tank 130 can be maintained at the cold water temperature, so that the user can use cold water.

[0086] Furthermore, since the second water temperature detecting component 136 is disposed in the cold tank 130, when hot water is used to sterilize the cold tank 130, the second water temperature detecting component 136 can be used to detect the water temperature of the water in the cold tank 130, thereby ensuring that the hot water in the cold tank 130 can sterilize the cold tank 130, thereby improving the sterilization effect on the cold tank 130, improving the sterilization quality of hot water, and providing reliable protection for the user's health.

[0087] Please refer to Figure 1 and Figure 2 In one embodiment, the cold water pipeline 13 also includes a water level detection component 137, which is arranged in the cold tank 130 and is used to detect the water level of the water in the cold tank 130, so that when the water level in the cold tank 130 is low, the cold tank water inlet valve 132 is controlled to be turned on, so that normal temperature water can enter the cold tank 130 through the instant heating pipeline 131, and then the cold tank 130 can be replenished with water to ensure that when the user takes cold water, there is enough cold water in the cold tank 130 for the user to take, thereby improving the user's experience of taking cold water.

[0088] It is understandable that the water level detection member 137 includes at least one of a water level probe, a water level float and a Hall element. In other embodiments, the water level detection member 137 can also be in other forms. In the embodiment of the present application, the specific form of the water level detection member 137 is not limited.

[0089] Please refer to Figure 1 and Figure 2 In one embodiment, the drinking water device 1 also includes a main water inlet pipe 16 and a first flow meter 160. The main water inlet pipe 16 is connected to the instant hot water inlet pipe 124 and the instant hot water pipeline 131, and is used to supply water to the instant hot water pipeline 12 and the cold water pipeline 13; the first flow meter 160 is arranged on the main water inlet pipe 16, and is used to detect the flow rate of the main water inlet pipe 16.

[0090] Please refer to Figure 1 and Figure 2 In one embodiment, the cold water pipeline 13 further includes a second flow meter, which is disposed at the cold tank water outlet pipe 133 and is used to cooperate with the first flow meter 160 to detect the water level in the cold tank 130 .

[0091] Please refer to Figure 1 and Figure 2 In one embodiment, the cold water pipeline 13 further includes an exhaust pipe 138, which is connected to the cold tank 130. The exhaust pipe 138 is used to connect the cold tank 130 and the atmosphere, so as to balance the internal and external air pressures of the cold tank 130, so as to facilitate the entry of normal temperature water into the cold tank 130. This can replenish water to the cold tank 130 and facilitate the entry of hot water into the cold tank 130, so as to sterilize the cold tank 130. It can also facilitate the outflow of cold water in the cold tank 130, so as to empty the cold tank 130 or be taken by the user.

[0092] Please refer to Figure 1 and Figure 2 Furthermore, the cold water pipeline 13 also includes an exhaust valve, which is arranged on the exhaust pipe 138 and is used to control the opening and closing of the exhaust pipe 138.

[0093] Please refer to Figure 1 and Figure 2 For example, when the cold tank 130 needs to be replenished with water or sterilized with hot water, after the room temperature water or hot water enters the cold tank 130, the exhaust valve can be controlled to close to reduce the loss of cold air through the exhaust pipe 138 during the refrigeration process, so as to improve the refrigeration efficiency of the cold tank 130, or reduce the loss of hot air from the hot water through the exhaust pipe 138, so as to improve the sterilization effect of the hot water on the cold tank 130.

[0094] Please refer to Figure 1 and Figure 2 In one embodiment, the cold water pipeline 13 further includes a drain pipe, which is connected to the drain port of the cold tank 130. The drain pipe can be used to drain the water in the cold tank 130 so as to clean the cold tank 130. It is understandable that a drain valve is also provided on the drain pipe, and the opening and closing of the drain pipe can be controlled by controlling the opening and closing of the drain valve, thereby controlling the drainage state of the cold tank 130.

[0095] Please refer to Figure 1 and Figure 2 In the embodiment of the present application, in order to optimize the pipe design, the normal temperature water outlet and the cold water outlet are merged. In order to prevent the cross-flow of normal temperature water and cold water, a one-way valve 18 is also provided on the cold water outlet pipe 133, so that when the cold water is not taken, the one-way valve 18 can remain closed to prevent the normal temperature water from entering the cold water outlet pipe, thereby improving the user's experience of taking cold water.

[0096] Please refer to Figure 1 , Figure 2 and Figure 3 The embodiment of the present application also provides a control method for the drinking water device 1, the control method comprising:

[0097] Step S100: when the first sterilization condition is met, the water level in the cold tank 130 is obtained.

[0098] In the embodiment of the present application, when the first sterilization condition is met, the controller can obtain the water level of the water in the cold tank 130 through the water level detection member 137. In other embodiments, the water level of the water in the cold tank 130 can also be obtained through the first flow meter 160 and the second flow meter. In the embodiment of the present application, the water level detection method of the water in the cold tank 130 is not specifically limited.

[0099] It is understandable that the first sterilization condition includes that the drinking water device 1 continues to run for a preset operating time, or the drinking water device 1 receives a sterilization signal. Specifically, the preset operating time can be 10 hours, 24 hours, 36 hours, 72 hours... In the embodiment of the present application, there is no specific limitation on the preset operating time. Specifically, the sterilization signal received by the drinking water device 1 can be sent by a mobile device, or it can be sent by a trigger device provided on the drinking water device 1. For example, the trigger device can be a button provided on the drinking water device 1. The mobile device can be a mobile phone, a watch, a tablet, a laptop computer, etc. that can communicate with the drinking water device 1, wherein the communication method includes at least one of NFC (Near Field Communication), Bluetooth (bluetooth) and WIFI (Wireless Fidelity).

[0100] Step S200, when the water level in the cold tank 130 is not higher than the first preset water level, the instant heating pipeline 12 is controlled to work, and the return pipeline 14 is controlled to return the hot water in the instant heating pipeline 12 to the cold tank 130 to sterilize the cold water pipeline 13.

[0101] In an embodiment of the present application, when the water level in the cold tank 130 is not higher than the first preset water level, the controller can control the return water pipe 140 to be connected to the water outlet of the heat collecting pipe, and control the instant heating water inlet pipe 124 to be opened, and control the instant heating pipe 120 to work, so that when normal temperature water flows through the instant heating pipe 120, the instant heating pipe 120 can heat the normal temperature water into hot water, and the hot water enters the cold tank 130 through the return water pipe 140 to perform hot water sterilization on the cold tank 130, thereby reducing the probability of bacteria growing in the cold water pipe 13, so as to provide reliable protection for the user's drinking water health.

[0102] Furthermore, since the instant heating pipe 12 is used in the present application, normal temperature water can be heated to hot water when it flows through the instant heating pipe 12. Compared with the solution of using a hot tank to heat normal temperature water, the instant heating pipe 12 can have a higher heating efficiency. Therefore, when sterilizing the cold water pipe 13, the time for normal temperature water to be heated to hot water can be reduced, thereby improving the sterilization efficiency of the cold water pipe 13.

[0103] Please refer to Figure 1 , Figure 2 and Figure 4 In one embodiment, step S200 includes:

[0104] Step S210: When the water level in the cold tank 130 is not higher than the first preset water level, the hot water outlet pipe 121 is controlled to be closed, and the return water pipe 140 is controlled to be opened.

[0105] In an embodiment of the present application, when the water level in the cold tank 130 is not higher than the first preset water level, the controller can control the instant heating water outlet pipe 121 to close, and control the return water pipe 140 to open, so that the cold tank 130 can be connected to the water outlet of the instant heating pipe 120 through the return water pipe 140.

[0106] Step S220 , control the instant heating water inlet pipe 124 to open, and control the instant heating pipe 120 to work, so that hot water with a first preset water temperature can enter the cold tank 130 through the return water pipe 140 to sterilize the cold tank 130 .

[0107] In an embodiment of the present application, after the cold tank 130 is connected to the water outlet of the instant heating pipe 120 through the return water pipe 140, the controller controls the instant heating water inlet valve 125 to open to open the instant heating water inlet pipe 124, and controls the hot water pump 126, the pressure reducing valve 127 and the instant heating pipe 120 to operate so that the instant heating pipe 120 can heat the room temperature water into hot water with a first preset water temperature, and the hot water with the first preset water temperature can enter the cold tank 130 via the return water pipe 140, thereby sterilizing the cold tank 130.

[0108] Please refer to Figure 1 , Figure 2 and Figure 5 In one embodiment, step S210 includes:

[0109] Step S211 , when the water level in the cold tank 130 is not higher than the first preset water level, the three-way control valve 15 is controlled to connect the water outlet of the heating pipe 120 with the return water pipe 140 .

[0110] In an embodiment of the present application, when the water level in the cold tank 130 is not higher than the first preset water level, the controller controls the three-way control valve 15 to connect the water outlet of the instant heating pipe 120 and the return water pipe 140. At this time, the water outlet of the instant heating pipe 120 and the instant heating water outlet pipe 121 are not connected to ensure that all the hot water can enter the cold tank 130, thereby improving the sterilization efficiency of the cold tank 130.

[0111] Please refer to Figure 1 , Figure 2 and Figure 6 In one embodiment, after step S220, the method further includes:

[0112] Step S230, when the water level in the cold tank 130 is not lower than the second preset water level, the instant heating water inlet pipe 124 is controlled to be closed, the instant heating pipe 120 is controlled to stop heating, and the return water pipe 140 is controlled to be closed; wherein the second preset water level is higher than the first preset water level.

[0113] In the embodiment of the present application, when the water level in the cold tank 130 is not lower than the second preset water level, the controller controls the instant hot water inlet valve 125 to close, so that the instant hot water inlet pipe 124 is closed, and controls the instant hot water pipe 120 to stop heating, and controls the first control valve 141 to close, so that the return water pipe 140 is closed, so that the hot water with the first preset water temperature can be retained in the cold tank 130 to sterilize the cold tank 130; and because the return water pipe 140 is closed, the probability of the steam generated by the hot water in the cold tank 130 escaping from the return water pipe 140 can be reduced, so that the temperature of the hot water in the cold tank 130 can be reduced slowly, so as to improve the sterilization effect of the hot water on the cold tank 130. In other embodiments, the three-way control valve 15 can also be controlled to conduct the water outlet of the instant hot water pipe 120 and the instant hot water outlet pipe 121, and at this time, the return water pipe 140 is also in a closed state.

[0114] Please refer to Figure 1 , Figure 2 and Figure 7 In one embodiment, after step S230, the method further includes:

[0115] Step S240, when the second sterilization condition is met, control the cold tank water outlet pipe 133 to open, and the hot water in the cold tank 130 is discharged through the cold tank water outlet pipe 133 to sterilize the cold tank water outlet pipe 133; wherein the second sterilization condition includes the water temperature of the hot water in the cold tank 130 being reduced to a second preset water temperature, the second preset water temperature being lower than the first preset water temperature, and / or the water level of the cold tank 130 being at the second preset water level for a preset sterilization time.

[0116] In an embodiment of the present application, when the second sterilization condition is met, the controller controls the cold tank water outlet valve 135 to open, so that the cold tank water outlet pipe 133 is opened, and the hot water in the cold tank 130 can be discharged through the cold tank water outlet pipe 133, so that the hot water can be used to sterilize the cold tank water outlet pipe 133, thereby reducing the probability of bacteria growing in the cold tank water outlet pipe 133, thereby providing reliable protection for the user's drinking water health.

[0117] It is understandable that the second sterilization condition can be that the water temperature of the hot water in the cold tank 130 is reduced to a second preset water temperature, and the second preset water temperature is lower than the first preset water temperature. In other embodiments, the second sterilization condition can also be that the water level of the cold tank 130 continues to preset the sterilization time at the second preset water level. Exemplarily, the first preset water temperature can be 100°, 99°, 98°, 97°, 96°... In other embodiments, the first preset water temperature can also be other temperatures. In the embodiment of the present application, the specific temperature value of the first preset water temperature is not limited. Exemplarily, the second preset water temperature can be 65°, 70°, 75°, 80°... In other embodiments, the second preset water temperature can also be other temperatures. In the embodiment of the present application, the specific temperature value of the second preset water temperature is not limited.

[0118] The preset sterilization time can be 10 minutes, 15 minutes, 20 minutes, 25 minutes, 30 minutes, 40 minutes... In other embodiments, the preset sterilization time can also be other time lengths. In the embodiments of the present application, there is no specific limitation on the preset sterilization time length.

[0119] Please refer to Figure 1 , Figure 2 and Figure 8 In one embodiment, before step S200, the method further includes:

[0120] Step S300 , when the water level in the cold tank 130 is higher than the first preset water level, control the cold tank water outlet pipe 133 to open, so that the water in the cold tank 130 is discharged through the cold tank water outlet pipe 133 .

[0121] In an embodiment of the present application, when the controller obtains through the water level detection component 137 that the water level in the cold tank 130 is higher than the first preset water level, the controller can control the cold tank water outlet valve 135 to open, so that the cold tank water outlet pipe 133 is opened, so that the water in the cold tank 130 can be discharged through the cold tank water outlet pipe 133, thereby adjusting the water level in the cold tank 130.

[0122] Please refer to Figure 1 , Figure 2 and Fig. 9 In one embodiment, before step S200, the method further includes:

[0123] Step S400: When the water level in the cold tank 130 is higher than a first preset water level, the drain pipe is controlled to be opened so that the water in the cold tank 130 is discharged through the drain pipe.

[0124] In an embodiment of the present application, when the controller obtains through the water level detection component 137 that the water level in the cold tank 130 is higher than the first preset water level, the controller can control the drain valve to open so that the drain pipe is opened, so that the water in the cold tank 130 can be discharged through the drain pipe, thereby adjusting the water level in the cold tank 130.

[0125] It is understandable that the first preset water level can be the lowest water level that can be measured by the water level detection member 137 in the cold tank 130, or it can be the water level at which the cold tank 130 is emptied. In other embodiments, the first preset water level can also be higher than the lowest water level that can be measured by the water level detection member 137. At this time, the heating power of the hot water pipe 120 can be adjusted according to the specific water level height of the water in the cold tank 130 to adjust the water temperature at the water outlet of the hot water pipe 120, thereby ensuring that the water temperature after the hot water heated by the hot water pipe 120 enters the cold tank 130 and mixes with the residual water in the cold tank 130 is still higher than the second preset water temperature, thereby improving the sterilization effect of hot water on the cold tank 130 and reducing the probability of bacterial growth in the cold tank 130.

[0126] It is understandable that in order to meet different sterilization requirements, the above control method can be cycled multiple times until the corresponding requirements are met. The number of cycles can be 3 times, 4 times, 5 times, 6 times... In the embodiments of the present application, the number of cycles is not specifically limited.

[0127] In the description of the present application, it should be understood that if the terms "up", "down", "left", "right", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, it is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limitations on the present application. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0128] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as suggesting or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0129] In the description of this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be fixedly connected, detachably connected, or integrated; it can be mechanically connected, or electrically connected; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0130] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0131] The above contents are only specific implementation methods of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A drinking water device, characterized in that: include: That is, hot pipe; a cold water pipeline, comprising a cold tank and a cold tank water outlet pipe, wherein the cold tank water outlet pipe is connected to a water outlet of the cold tank; and The reflux pipeline is connected to the instant heating pipeline and the cold tank, and is used to reflux the hot water in the instant heating pipeline into the cold tank when the cold tank is sterilized, and can be discharged from the cold tank water outlet pipe to sterilize the cold tank and the cold tank water outlet pipe.

2. The drinking water device according to claim 1, characterized in that: The cold water pipeline also includes: A cold water pump, disposed on the cold tank water outlet pipe; and The cold tank water outlet valve is arranged on the cold tank water outlet pipe and on a side of the cold water pump away from the cold tank.

3. The drinking water device according to claim 1, characterized in that: The cold water pipeline also includes: a cold tank water inlet pipe, connected to the water inlet of the cold tank and connected to the return pipeline; and A cold tank water inlet valve is arranged on the cold tank water inlet pipe; the return pipeline is connected to a side of the cold tank water inlet valve close to the cold tank; When the cold water pipeline is sterilized, the return pipeline is opened, the cold tank water inlet valve is closed, and the hot water in the instant heating pipeline enters the cold tank via the return pipeline and the cold tank water inlet pipe.

4. The drinking water device according to claim 1, characterized in that: The cold water pipeline also includes: The second water temperature detection component is arranged in the cold tank and is used for detecting the water temperature of the water in the cold tank.

5. The drinking water device according to claim 1, characterized in that: The cold water pipeline also includes: A water level detection component, disposed in the cold tank, for detecting the water level in the cold tank; Wherein, the water level detection component includes at least one of a water level probe, a water level float and a Hall element.

6. The drinking water device according to claim 1, characterized in that: Also includes: A main water inlet pipe, connected to the instant heating pipeline and the cold water pipeline, and used to supply water to the instant heating pipeline and the cold water pipeline; as well as The first flow meter is arranged on the main water inlet pipe.

7. The drinking water device according to claim 6, characterized in that: The cold water pipeline also includes: a cold tank water outlet pipe, connected to the water outlet of the cold tank; and The second flow meter is arranged on the water outlet pipe of the cold tank and is used to cooperate with the first flow meter to detect the water level in the cold tank.

8. The drinking water device according to claim 1, characterized in that: The cold water pipeline also includes: An exhaust pipe is connected to the cold tank and is used for connecting the cold tank and the atmosphere.

9. The drinking water device according to claim 8, characterized in that: The cold water pipeline also includes: An exhaust valve is arranged on the exhaust pipe and is used to control the opening and closing of the exhaust pipe.

10. The drinking water device according to any one of claims 2 to 9, characterized in that: The return line comprises: a return water pipe, connected to the instant heating pipeline and the cold tank; and A first control valve is arranged on the return water pipe; When the cold tank is sterilized, the first control valve is opened, and the hot water in the instant heating pipeline enters the cold tank via the return water pipe.

11. The drinking water device according to claim 10, characterized in that: The instant heating pipeline also includes: That is, the heat pipe, the water inlet is used to receive normal temperature water, and the water outlet is connected to the return water pipe; an instant heating water outlet pipe connected to the water outlet of the instant heating pipe; and The second control valve is arranged on the instant hot water outlet pipe. When the cold tank is sterilized, the first control valve is opened and the second control valve is closed.

12. The drinking water device according to claim 11, characterized in that: The first control valve and the second control valve are integrally a three-way control valve, or the first control valve and the second control valve are different control valves.

13. The drinking water device according to claim 11, characterized in that: The instant heating pipeline also includes: The first water temperature detection component is arranged at the water outlet of the heating pipe and is used to detect the water temperature of the water outlet of the heating pipe.

14. The drinking water device according to claim 11, characterized in that: The instant heating pipeline also includes: An instant heating water inlet pipe, connected to the water inlet of the instant heating pipe; an instant hot water inlet valve, disposed on the instant hot water inlet pipe; and A hot water pump is arranged on the instant heating water inlet pipe and on a side of the instant heating water inlet valve close to the instant heating pipe.

15. The drinking water device according to claim 14, characterized in that: The instant heating pipeline also includes: The pressure reducing valve is arranged on the instant hot water inlet pipe and between the instant hot water inlet valve and the hot water pump.

16. A method for controlling a drinking water device, characterized in that: Applicable to the drinking water device according to any one of claims 1 to 15, the control method comprises: When the first sterilization condition is met, obtaining the water level of the water in the cold tank; When the water level in the cold tank is not higher than a first preset water level, the instant heating pipeline is controlled to operate, and the return pipeline is controlled to return the hot water in the instant heating pipeline to the cold tank to sterilize the cold water pipeline.

17. The control method of the drinking water device according to claim 16, characterized in that: The instant heating pipeline includes an instant heating pipe, an instant heating water inlet pipe and an instant heating water outlet pipe, the instant heating water inlet pipe is connected to the water inlet of the instant heating pipe, the instant heating water outlet pipe is connected to the water outlet of the instant heating pipe, and the return pipeline includes a return water pipe, the return water pipe is connected to the water outlet of the instant heating pipe and the cold tank; When the water level in the cold tank is not higher than a first preset water level, the step of controlling the instant heating pipeline to operate and controlling the return pipeline to return the hot water in the instant heating pipeline to the cold tank to sterilize the cold water pipeline includes: When the water level in the cold tank is not higher than the first preset water level, the instant hot water outlet pipe is controlled to be closed, and the return water pipe is controlled to be opened; The instant heating water inlet pipe is controlled to open, and the instant heating pipe is controlled to operate, so that hot water with a first preset water temperature can enter the cold tank through the return water pipe to sterilize the cold tank.

18. The control method of the drinking water device according to claim 17, characterized in that: The drinking water device further comprises a three-way control valve, a first valve port of the three-way control valve is connected to the water outlet of the instant heating pipe, a second valve port of the three-way control valve is connected to the return water pipe, and a third valve port of the three-way control valve is connected to the instant heating water outlet pipe; When the water level in the cold tank is not higher than the first preset water level, the step of controlling the instant hot water outlet pipe to close and controlling the return water pipe to open comprises: When the water level in the cold tank is not higher than the first preset water level, the three-way control valve is controlled to connect the water outlet of the instant heating pipe with the return water pipe.

19. The control method of the drinking water device according to claim 17, characterized in that: After the step of controlling the instant heating water inlet pipe to open and controlling the instant heating pipe to operate so that hot water with a first preset water temperature can enter the cold tank through the return water pipe to sterilize the cold tank, the method further includes: When the water level in the cold tank is not lower than a second preset water level, the instant heating water inlet pipe is controlled to be closed, the instant heating pipe is controlled to stop heating, and the return water pipe is controlled to be closed; Wherein, the second preset water level is higher than the first preset water level.

20. The control method of the drinking water device according to claim 19, characterized in that: The cold water pipeline also includes a cold tank water outlet pipe, which is connected to the water outlet of the cold tank; when the water level in the cold tank is not lower than the second preset water level, the instant heating water inlet pipe is controlled to be closed, the instant heating pipe is controlled to stop heating, and the return water pipe is controlled to be closed, the method further includes: When the second sterilization condition is met, the cold tank water outlet pipe is controlled to be opened, and the hot water of the cold tank is discharged through the cold tank water outlet pipe to sterilize the cold tank water outlet pipe; The second sterilization condition includes that the water temperature of the hot water in the cold tank is reduced to a second preset water temperature, the second preset water temperature is lower than the first preset water temperature, and / or the water level of the cold tank is at the second preset water level for a preset sterilization time.

21. The control method of the drinking water device according to any one of claims 16 to 20, characterized in that: The cold water pipeline also includes a cold tank water outlet pipe, which is connected to the water outlet of the cold tank. When the water level in the cold tank is not higher than a first preset water level, the instant heating pipeline is controlled to work, and the return pipeline is controlled to return the hot water in the instant heating pipeline to the cold tank to sterilize the cold water pipeline. Before the step, the method further includes: When the water level in the cold tank is higher than the first preset water level, the cold tank water outlet pipe is controlled to open, so that the water in the cold tank is discharged through the cold tank water outlet pipe; or, The cold water pipeline also includes a drain pipe, which is connected to the drain port of the cold tank. When the water level in the cold tank is not higher than the first preset water level, the instant heating pipeline is controlled to work, and the return pipeline is controlled to return the hot water in the instant heating pipeline to the cold tank to sterilize the cold water pipeline. Before the step, the method further includes: When the water level in the cold tank is higher than the first preset water level, the drain pipe is controlled to open so that the water in the cold tank is discharged through the drain pipe.

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