Zero-cold-water boiled water preparation method of water purification equipment and water purification equipment

Abstract

The invention relates to the technical field of water purification, and discloses a zero-cold-water boiled water preparation method of water purification equipment and the water purification equipment, the water purification equipment comprises: a water supply module having a purified water outlet and a circulating water inlet; the heat exchange module is provided with a hot water path and a cold water path; the outlet end of the heating module is respectively communicated with the inlet end of the hot water path and a water outlet module of the water purification equipment; the cold water path is communicated with the purified water outlet and the inlet end of the heating module, and the outlet end of the hot water path is selectively communicated with the water outlet module and the circulating water inlet; the water purification equipment has a heat preservation mode, a cyclic heating mode and a zero-cold-water boiled water preparation mode. When it is monitored that the water storage temperature in the heat exchange module is smaller than or equal to the set temperature, the circulating heating mode is started, it is ensured that no cold water exists in the heat exchange module, the heating time of the heating module can be shortened, and the water taking waiting time of a user is shortened; and the problem that the water outlet temperature is low due to the fact that cold water is doped in a hot water path of the heat exchange module when the boiled water is prepared is solved.

Description

Technical Field

[0001] The invention relates to the technical field of water purification, and in particular to a method for preparing cooked water with zero cold water for a water purification device and a water purification device. Background Art

[0002] In order to meet people's needs for drinking hot water at any time, many water purification devices on the market are equipped with instant heating faucets, creating all-in-one water purification and heating machines that can not only produce boiling water, but also quickly reduce the hot water to the set temperature through a heat exchanger, achieving the function of quickly producing cooked water, which is deeply loved by users.

[0003] However, although the water purification equipment currently on the market can instantly provide cooked water at multiple temperatures, the volume of cold water in the boiling water gear is too large during the heating process of the instant heating method. The cooked water must be boiled first and then the temperature is controlled. The low-temperature water in the boiling water gear will be transferred to the cooked water gear in situ, causing the water temperature in each gear to be lower than the set value. The mixed cold water will cause the temperature of the water purification equipment to be low when the cooked water is just produced, so that the first cup of water when the user actually takes water is cold water, affecting the user experience. Summary of the invention

[0004] In view of this, the present invention provides a method for preparing cooked water with zero cold water of a water purification device and a water purification device, so as to solve the problem in the prior art that when a user takes the first cup of cooked water, the temperature is relatively low, affecting the user experience.

[0005] In a first aspect, the present invention provides a method for preparing cooked water with zero cold water in a water purification device, the water purification device comprising:

[0006] A water supply module having a clean water outlet and a circulating water inlet;

[0007] The heat exchange module has a hot water circuit and a cold water circuit that are independent of each other and capable of heat exchange;

[0008] A heating module, wherein the outlet end of the heating module is respectively connected with the inlet end of the hot water circuit and the water outlet module of the water purification equipment;

[0009] The purified water outlet is connected to the inlet of the cold water circuit, the outlet of the cold water circuit is connected to the inlet of the heating module, and the outlet of the hot water circuit is selectively connected to the water outlet module and the circulating water inlet;

[0010] The water purification equipment has a heat preservation mode, a circulation heating mode and a zero cold water cooked water preparation mode. The zero cold water cooked water preparation method includes the following steps:

[0011] Enter the keep warm mode;

[0012] If the water temperature T of the heat exchange module is monitored to be less than or equal to the set temperature T0 during the heat preservation process, the outlet of the hot water circuit is controlled to switch to a state of being connected to the circulating water inlet, and the heating module is controlled to start and enter the circulating heating mode, so that the water temperature in the heat exchange module is kept above the set temperature T0;

[0013] When a cooked water taking signal is received during the heat preservation process, the outlet end of the hot water circuit is controlled to switch to a state of being connected to the water outlet module, and enters the zero cold water cooked water preparation mode;

[0014] The water supply module is controlled to transport the external water to the heating module through the cold water channel of the heat exchange module, and the heating module heats the water to 100°C;

[0015] Then, part of the heated water is controlled to flow into the hot water channel for heat exchange cooling, and the other part directly flows into the water outlet module and is adjusted to the target temperature with the cooked water flowing out of the hot water channel for use by users.

[0016] Beneficial effect: The outlet end of the hot water circuit can be selectively connected to the water outlet module and the circulating water inlet. The hot water after heat exchange in the heat exchange module can be divided into two paths. The cooked water is output through the water outlet module for users to take, or it can be returned to the water supply module through the circulating water inlet to facilitate the realization of the circulating heating and insulation function. When water is not being produced, the water purification equipment can enter the insulation mode. During the insulation process, if the monitored water temperature in the heat exchange module is less than or equal to the set temperature, the outlet end of the hot water circuit can be controlled to switch to a state connected to the circulating water inlet, and the heating module can be controlled to heat and enter the circulation heating mode to ensure that the water temperature in the heat exchange module remains above the set temperature T0. In this way, when the user takes cooked water, since the water temperature in the cold water circuit and the hot water circuit is above T0, there is no cold water in the heat exchange module. This can not only shorten the heating time of the heating module and reduce the waiting time for the user to take water, but also avoid the problem of low outlet water temperature caused by cold water mixed in the hot water circuit of the heat exchange module when preparing cooked water, ensuring that the first cup of water the user takes is the set temperature, improving the user experience, and effectively solving the problem of low temperature when the user takes the first cup of cooked water, affecting the user experience.

[0017] In addition, by setting up a circulating water inlet and adopting a design that the outlet end of the hot water water circuit can be selectively connected to the circulating water inlet, there is no need to add an additional preheating structure in the heat exchange module or the water supply pipeline. The insulation function of the heat exchange module can be achieved by using only the original heating module of the system, ensuring that there is no cold water in the water circuit of the heat exchange module, which can achieve the purpose of simplifying the structure and saving costs. It effectively solves the problem in the prior art that zero cold water water purification equipment requires an additional preheating structure, resulting in a complex structure of the whole machine and high cost.

[0018] In an optional embodiment, the zero cold water cooked water preparation mode specifically further includes the following steps:

[0019] The water supply module is controlled to deliver the normal temperature purified water to the cold water circuit according to the first set flow rate Q1 to exchange heat with the hot water in the hot water circuit. The water after heat exchange is heated to 100°C by the heating module;

[0020] A portion of the boiled water heated by the heating module is controlled to flow into the hot water circuit to cool down to 45°C, and the other portion and the 45°C cooked water flowing out of the hot water circuit are adjusted to the target temperature by the regulating valve for use by users.

[0021] Beneficial effect: by monitoring the heat exchange module to keep the water temperature above the set temperature, when preparing cooked water, the water supply module pushes the room temperature water into the cold water channel according to the first set flow rate Q1 to exchange heat with the hot water in the hot water channel. The water after heat exchange is heated to 100°C by the heating module. Since the room temperature water is heat exchanged with the hot water in the hot water channel and the cold water channel also stores hot water above the set temperature, the temperature of the water entering the heating module will increase, thereby shortening the time it takes for the heating module to boil the water. Moreover, since the hot water channel of the heat exchange module also stores hot water above the set temperature, the hot water stored in the hot water channel will be pushed out when boiling water is passed into the hot water channel, thereby effectively ensuring that there is no cold water in the entire process of preparing cooked water, avoiding the problem of low outlet water temperature caused by residual cold water in the water channel when preparing cooked water, improving the user experience, and overcoming the problem of low temperature of the first cup of cooked water taken by the user, small flow rate, and time waste due to residual water in the instant water purification equipment in the prior art.

[0022] In an optional embodiment, the cyclic heating mode further comprises the following steps:

[0023] Control the circulation branch connected between the purified water outlet of the water supply module, the cold water circuit, the heating module, the hot water circuit, and the circulating water inlet of the water supply module to be in a conducting state;

[0024] The water supply module is controlled to drive the water in the cold water channel and the hot water channel to circulate into the heating module in sequence for heating according to the second set flow rate Q2, and the heating is stopped when the water temperature in the cold water channel and the hot water channel reaches 100°C.

[0025] Beneficial effect: During the insulation process, when it is detected that the water storage temperature of the heat exchange module is ≤ the set temperature T0, the circulation heating mode is entered, and the water supply module circulates the water in the cold water circuit and the hot water circuit of the heat exchange module into the heating module in sequence according to the second set flow rate Q2 for heating. The heating module stops heating after heating to 100°C to ensure that the water storage temperature in the heat exchange module is not lower than the set temperature, thereby avoiding the accumulation of cold water in the hot water circuit of the heat exchange module when preparing cooked water later, resulting in the problem of low temperature of the first cup of cooked water taken by the user.

[0026] In an optional embodiment, the set temperature T0 is 70° C.; and / or the power of the heating module is 2100 W.

[0027] In a second aspect, the present invention further provides a water purification device for preparing cooked water using the zero cold water cooked water preparation method of any of the above-mentioned embodiments.

[0028] In an optional embodiment, the outlet end of the hot water circuit is selectively connected to the water outlet module and the circulating water inlet through a first dual-channel solenoid valve.

[0029] Beneficial effect: By setting up the first dual-channel solenoid valve, it is convenient to control the hot water after heat exchange in the hot water water circuit to enter the water outlet module to prepare cooked water of different temperatures, or to enter the water supply module to realize the circulation heating function, so as to ensure that the water storage temperature in the heat exchange module is not lower than the set temperature T0, so that the water coming out of the hot water water circuit can be divided into two paths to flow back to the clean water pump for circulation, so as to realize large-flow boiling water, or directly flow into the water outlet module to output cooked water.

[0030] In an optional embodiment, the water supply module includes:

[0031] A clean water pump, the clean water pump has a water inlet and a clean water outlet, and the water inlet is connected to an external water source through a water inlet pipeline;

[0032] The circulating water inlet is located on the water inlet pipeline, and the first outlet of the first dual-channel solenoid valve is connected to the circulating water inlet through a reflux pipeline.

[0033] Beneficial effect: The first dual-channel solenoid valve is a one-inlet and two-outlet solenoid valve, having a first inlet, a first outlet and a second outlet. The first inlet is connected to the outlet of the hot water circuit, the first outlet is connected to the circulating water inlet through a reflux pipeline, and the second outlet is connected to the water outlet module through a pipeline. The first dual-channel solenoid valve has a first state in which the first inlet is connected to the first outlet, and a second state in which the first inlet is connected to the second outlet. When in the circulating heating mode, the first dual-channel solenoid valve switches to the first state to connect the circulating branch, and the hot water flowing out through the first outlet enters the clean water pump in turn through the reflux pipeline, the circulating water inlet, and the water inlet pipeline between the circulating water inlet and the water inlet, and is then pumped into the cold water circuit, the heating module, and the hot water circuit of the heat exchange module in turn through the clean water pump to realize circulating heating.

[0034] In an optional embodiment, the first dual-channel solenoid valve further has a first inlet and a second outlet;

[0035] The outlet of the hot water circuit is connected to the first inlet through a first pipeline, and the second outlet is connected to the water outlet module through a second pipeline.

[0036] In an optional embodiment, the water outlet module includes:

[0037] water outlet;

[0038] A regulating valve is arranged upstream of the water outlet and is used to adjust the outlet water temperature of the water outlet. The regulating valve has a first regulating water inlet, a second regulating water inlet, and a regulating water outlet;

[0039] Among them, the first regulating water inlet is connected to the outlet end of the hot water circuit, the second regulating water inlet is connected to the water outlet end of the heating module, and the regulating water outlet is connected to the inlet of the water outlet nozzle.

[0040] Beneficial effect: Through the setting regulating valve, part of the boiled water after being boiled by the heating module flows to the water outlet through the regulating valve, and the other part is input into the hot water water circuit of the heat exchange module, and is cooled down by heat exchange with the normal temperature purified water in the cold water circuit to form low-temperature cooked water, and then flows to the water outlet through the regulating valve. The mixing ratio of boiled water and low-temperature cooked water is controlled by the regulating valve, which can meet the user's demand for cooked water at different temperatures.

[0041] In an optional embodiment, the heat exchange module includes:

[0042] The heat exchange inner tube, whose internal flow channel constitutes a hot water circuit;

[0043] The heat exchange outer tube, the heat exchange inner tube is sleeved inside the heat exchange outer tube, and the flow channel between the heat exchange inner tube and the heat exchange outer tube constitutes a cold water circuit;

[0044] The inner diameter of the outer heat exchange tube is set to d1, and the inner diameter of the inner heat exchange tube is set to d2, wherein 3.5d2≥d1≥2.5d2.

[0045] Beneficial effects: The heat exchange module is based on the shell-and-tube heat exchanger structure. The hot and cold fluids are respectively transported through the inner and outer tubes. In the normal boiled water mode, the hot water flows inside the heat exchange inner tube, and the cooling water flows through the heat exchange outer tube, achieving instant cooling, thereby achieving non-contact heat exchange between the two fluids to change the temperature. In the large-flow boiling water mode, the normal temperature water flows through the heat exchange outer tube and the heat exchange inner tube for heat exchange preheating. By designing the inner diameter d1 of the heat exchange outer tube and the inner diameter d2 of the heat exchange inner tube within the ratio range of 3.5d2≥d1≥2.5d, the heat exchange module can not only perform heat exchange, but also greatly increase the water storage capacity, and can also be used as a water tank or hot tank to store water. The heat exchange module integrates water storage and heat exchange functions, and has multiple uses, further simplifying the structure.

[0046] In an optional embodiment, the heating module includes a heating element and a first temperature sensing package, and the first temperature sensing package is used to detect the heating temperature of the heating element.

[0047] Beneficial effect: The first temperature sensing package can monitor the heating temperature of the heating element, thus avoiding the problem of not being able to discover in time when the heating temperature of the heating element is abnormal.

[0048] In an optional embodiment, the heat exchange module further includes a second temperature sensing package, and the second temperature sensing package is used to detect the temperature of the stored water in the heat exchange module.

[0049] Beneficial effect: The second temperature sensing package can monitor the water temperature in the heat exchange module to ensure that the water temperature in the heat exchange module is not lower than the set temperature in the insulation mode. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0051] Figure 1 This is a schematic diagram of the principles of each module of the water purification device according to the first embodiment of the present invention;

[0052] Figure 2 This is a detailed structural diagram of each module of the water purification equipment according to the first embodiment of the present invention;

[0053] Figure 3 Schematic diagram of water flow direction when the circulation branch of the water purifier is turned on when the water purifier is in the circulation heating mode according to the first embodiment of the present invention (the dotted line in the figure is the circulation branch);

[0054] Figure 4 Schematic diagram of water flow direction when the water purification device of the first embodiment of the present invention is in the zero cold water cooked water preparation mode (the dotted line in the figure is the conducting water path);

[0055] Figure 5 This is a schematic diagram of the principles of each module of the water purification device of the second implementation mode (compared with the first implementation mode, a second dual-channel solenoid valve and an eighth pipeline are added) in the embodiment of the present invention;

[0056] Figure 6 This is a detailed structural diagram of each module of the water purification equipment according to the second implementation mode in the embodiment of the present invention;

[0057] Figure 7 Schematic diagram of water flow direction when the circulation branch of the water purifier is turned on when the water purifier is in the circulation heating mode according to the second embodiment of the present invention (the dotted line in the figure is the circulation branch);

[0058] Figure 8Schematic diagram of water flow direction when the water purification device of the second embodiment of the present invention is in the zero cold water cooked water preparation mode (the dotted line in the figure is the conducting water path);

[0059] Fig. 9 A schematic flow chart of a method for preparing cooked water from zero cold water of a water purification device according to an embodiment of the present invention;

[0060] Fig.10 Schematic diagram of the structure of the heat exchange module in an embodiment of the present invention.

[0061] Description of reference numerals:

[0062] 10. Water supply module; 101. Clean water outlet; 102. Circulating water inlet; 11. Clean water pump; 12. Water inlet pipeline; 13. Return pipeline;

[0063] 20, heat exchange module; 21, hot water circuit; 22, cold water circuit; 201, heat exchange outer tube; 2010, serpentine channel; 202, heat exchange inner tube;

[0064] 30. Heating module; 31. Heating element; 32. First temperature sensing package;

[0065] 40. water outlet module; 41. regulating valve; 42. water outlet nozzle;

[0066] 50. A first dual-channel solenoid valve;

[0067] 60. Second dual-channel solenoid valve;

[0068] 1a, first pipeline; 2a, second pipeline; 3a, third pipeline; 4a, fourth pipeline; 5a, fifth pipeline; 6a, sixth pipeline; 7a, seventh pipeline; 8a, eighth pipeline. DETAILED DESCRIPTION

[0069] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0070] In the context of the big health industry, in order to meet people's demand for hot water at any time, household water purifiers are equipped with instant hot faucets based on water purification equipment to create a purifier and heat all-in-one machine. Since the maximum current of the power limit of general non-air-conditioning sockets is 10A, the power of the whole machine can only be limited to 2200W, and the boiling water flow of the instant hot faucet is only 400mL / min, which is much smaller than the 1.0L / min of the large-flow water purifier. Users have a long waiting time when getting boiling water, and the user experience is not good. At the same time, the instant heating element heating method also has the problem of simply heating to the set temperature without boiling water and too much cold water volume during the heating process.

[0071] Although the water purification equipment currently on the market can instantly provide cooked water at multiple temperatures, the volume of cold water in the boiling water gear is too large during the heating process of the instant heating method. The cooked water must be boiled first and then the temperature is controlled. The low-temperature water in the boiling water gear will be transferred to the cooked water gear in situ, causing the water extraction temperature of each gear to be lower than the set value. The cold water mixed in the water channel will cause the temperature of the water purification equipment to be low when the cooked water is just produced, so that the first cup of water when the user actually takes water is cold water, affecting the user experience.

[0072] In order to solve the problem of low temperature when the user takes the first cup of cooked water, the relevant technology preheats the water entering the heat exchange module by setting a preheating structure on the water supply pipeline. Although this can avoid the problem of low outlet water temperature caused by cold water mixed in the water channel when preparing cooked water to a certain extent, the additional preheating structure needs to be set up, which increases the complexity of the structure and the production cost of the whole machine.

[0073] Combine the following Figures 1 to 10 , describing an embodiment of the present invention.

[0074] According to an embodiment of the present invention, on the one hand, the present invention provides a method for preparing cooked water with zero cold water for a water purification device, such as Figures 1 to 4 As shown, the water purification equipment includes: a water supply module 10, a heat exchange module 20, and a heating module 30. The water supply module 10 has a purified water outlet 101 and a circulating water inlet 102; the heat exchange module 20 has a hot water waterway 21 and a cold water waterway 22 which are independent of each other and can perform heat exchange; the heating module 30, the outlet end of the heating module 30 is respectively connected with the inlet end of the hot water waterway 21 and the water outlet module 40 of the water purification equipment; the purified water outlet 101 is connected with the inlet end of the cold water waterway 22, and the outlet end of the hot water waterway 21 is selectively connected with the water outlet module 40 and the circulating water inlet 102; the water purification equipment has a heat preservation mode, a circulating heating mode and a zero cold water cooked water preparation mode.

[0075] Furthermore, combined with Figure 3 , Figure 4 , Figures 7 to 9 As shown, the method for preparing zero cold water cooked water comprises the following steps:

[0076] Step S101: Entering the keep warm mode;

[0077] Step S102: If the water temperature T of the heat exchange module 20 is monitored to be less than the set temperature T0 during the heat preservation process, the outlet end of the hot water circuit 21 is controlled to be switched to a state of being connected to the circulating water inlet 102, and the heating module 30 is controlled to start and enter the circulating heating mode, so that the water temperature in the heat exchange module 20 is kept above the set temperature T0;

[0078] Step S103: when a cooked water taking signal is received during the heat preservation process, the outlet end of the hot water circuit 21 is controlled to switch to a state of being connected to the water outlet module 40, and enters the zero cold water cooked water preparation mode;

[0079] Step S104: Control the water supply module 10 to transport the external water to the heating module 30 through the cold water channel 22 of the heat exchange module 20, and heat the water to 100° C. through the heating module 30;

[0080] Step S105: Control a portion of the heated boiled water to flow into the hot water path 21 for heat exchange cooling, and the other portion directly flows into the water outlet module 40 and is adjusted to the target temperature with the cooked water flowing out of the hot water path 21 for use by users.

[0081] In the above embodiment, the outlet end of the hot water circuit 21 can be selectively connected to the water outlet module 40 and the circulating water inlet 102. The hot water after heat exchange in the heat exchange module 20 can be divided into two paths. The cooked water can be output through the water outlet module 40 for the user to take, or it can be returned to the water supply module 10 through the circulating water inlet 102 to facilitate the circulating heating and heat preservation function. When water is not produced, the water purification equipment can enter the heat preservation mode. During the heat preservation process, if it is monitored that the water temperature in the heat exchange module 20 is less than or equal to the set temperature, the outlet end of the hot water circuit 21 can be controlled to switch to a state of being connected to the circulating water inlet 102, and the heating module 30 can be controlled to heat and enter the circulating heating mode to ensure that the water temperature in the heat exchange module 20 is maintained above the set temperature T0. In this way, when the user takes cooked water, since the water temperature in the cold water circuit 22 and the hot water circuit 21 is above T0, there is no cold water in the heat exchange module 20. When preparing cooked water, normal temperature water is pushed into the cold water circuit. The boiled water 22 is pushed out after heat exchange with the hot water water channel 21 and heated by the heating module 30. The boiled water heated by the heating module 30 is pushed into the hot water water channel 21 containing hot water, which can ensure a large flow rate without cold water throughout the process. This can not only shorten the heating time of the heating module 30 and reduce the waiting time for users to get water, but also avoid the problem of low outlet water temperature caused by cold water mixed in the hot water water channel 21 of the heat exchange module 20 when preparing cooked water, ensuring that the first cup of water taken by the user is at the set temperature, improving the user experience, and effectively solving the problem of low temperature when the user takes the first cup of cooked water, affecting the user experience.

[0082] In addition, by setting up a circulating water inlet 102 and adopting a design in which the outlet end of the hot water waterway 21 can be selectively connected to the circulating water inlet 102, there is no need to add an additional preheating structure in the heat exchange module 20 or the water supply pipeline. The heat preservation function of the heat exchange module 20 can be achieved by only using the original heating module 30 of the system, ensuring that there is no cold water in the water path of the heat exchange module 20, which can achieve the purpose of simplifying the structure and saving costs, and effectively solves the problem in the prior art that zero cold water water purification equipment needs to additionally set up a preheating structure, resulting in a complex structure of the whole machine and high cost.

[0083] In some embodiments, the zero cold water cooked water preparation mode specifically further includes the following steps:

[0084] Step S201: Control the water supply module 10 to deliver the normal temperature purified water to the cold water channel 22 according to the first set flow rate Q1 to exchange heat with the hot water in the hot water channel 21, and the water after heat exchange is heated to 100° C. by the heating module 30;

[0085] Step S202: Control a portion of the boiled water heated by the heating module 30 to flow into the hot water channel 21 to cool down to 45° C., and the other portion and the 45° C. cooked water flowing out of the hot water channel 21 are adjusted to the target temperature by the regulating valve 41 and then provided to the user.

[0086] In the above embodiment, the water temperature is kept above the set temperature by monitoring the heat exchange module 20. When preparing cooked water, the water supply module 10 pushes the normal temperature water into the cold water channel 22 according to the first set flow rate Q1 to exchange heat with the hot water in the hot water channel 21. The water after heat exchange is heated to 100°C by the heating module 30. Since the normal temperature water is heat exchanged with the hot water in the hot water channel 21 and the cold water channel 22 also stores hot water above the set temperature, the water temperature entering the heating module 30 will increase, thereby shortening the heating module 30. 0 The time for boiling water is reduced, and because the hot water circuit 21 of the heat exchange module 20 also stores hot water above the set temperature, the hot water stored in the hot water circuit 21 will be pushed out when boiling water is introduced, thereby effectively ensuring that there is no cold water in the entire process of preparing cooked water, avoiding the problem of low outlet water temperature caused by residual cold water in the water circuit when preparing cooked water, improving the user's usage experience, and overcoming the problem of residual water in the instant water purification equipment in the prior art causing the first cup of cooked water taken by the user to have a low temperature, a small flow rate, and a waste of time.

[0087] Optionally, the first set flow rate Q1 is between 0.3L and 2.0L / min.

[0088] In some embodiments, the cyclic heating mode further comprises the following steps:

[0089] Step S301: Control the circulation branch connected between the purified water outlet 101 of the water supply module 10, the cold water circuit 22, the heating module 30, the hot water circuit 21, and the circulating water inlet 102 of the water supply module 10 to be in a conducting state;

[0090] Step S302: Control the water supply module 10 to drive the water in the cold water channel 22 and the hot water channel 21 to circulate into the heating module 30 in sequence for heating according to the second set flow rate Q2, and stop heating when the water temperature in the cold water channel 22 and the hot water channel 21 reaches 100°C.

[0091] In the above embodiment, during the insulation process, when it is detected that the water storage temperature of the heat exchange module 20 is ≤ the set temperature T0, the circulation heating mode is entered, and the water supply module 10 circulates the water in the cold water channel 22 and the hot water channel 21 of the heat exchange module 20 into the heating module 30 in sequence according to the second set flow rate Q2 for heating. The heating is stopped after being heated to 100°C by the heating module 30 to ensure that the water storage temperature in the heat exchange module 20 is not lower than the set temperature, so as to avoid the accumulation of cold water in the hot water channel 21 of the heat exchange module 20 when preparing cooked water later, resulting in the problem of low temperature of the first cup of cooked water taken by the user.

[0092] In some embodiments, the set temperature T0 is 70° C.; the power of the heating module 30 is 2100 w, and the second set flow rate Q2 is 1 L / min.

[0093] In this embodiment, when the user does not take water, the water purification equipment starts the insulation mode to achieve idle heating. The heat exchange module 20 stores hot water. When taking cooked water, a large flow of water is taken throughout the process without cold water. When taking cooked water, according to the water storage temperature of the heat exchange module 20, the temperature of the heating module 30, and the temperature of the cooling liquid, a specific algorithm is used to control the water supply flow of the water supply module 10, the heating power of the heating module 30 and other parameters to ensure that the water temperature can reach the set value under any working condition, thereby achieving instantaneous preparation of boiled water with zero cold water, and solving the problem that the first cup of water is cold water and the temperature is low due to residual water in the water path.

[0094] According to an embodiment of the present invention, on the other hand, a water purification device is provided, which prepares cooked water using the zero cold water cooked water preparation method of any of the above embodiments.

[0095] In some embodiments, in combination Figures 1 to 4 As shown, the outlet end of the hot water circuit 21 is selectively connected to the water outlet module 40 and the circulating water inlet 102 via the first dual-channel solenoid valve 50 .

[0096] In the above embodiment, by setting up the first dual-channel solenoid valve 50, it is convenient to control the hot water after heat exchange in the hot water water circuit 21 to enter the water outlet module 40 to prepare cooked water of different temperatures, or to enter the water supply module 10 to realize the circulation heating function, so as to ensure that the water temperature in the heat exchange module 20 is not lower than the set temperature T0, so that the water coming out of the hot water water circuit 21 can be divided into two paths and returned to the water purification pump 11 for circulation, so as to realize a large flow of boiled water, or directly flow into the water outlet module 40 to output cooked water.

[0097] In some embodiments, the water supply module 10 includes a clean water pump 11, which has a water inlet and a clean water outlet 101, and the water inlet is connected to an external water source through an inlet pipe 12; the circulating water inlet 102 is located on the inlet pipe 12, and the first outlet of the first dual-channel solenoid valve 50 is connected to the circulating water inlet 102 through a return pipe 13.

[0098] In the above embodiment, the first dual-channel solenoid valve 50 is a one-inlet and two-outlet solenoid valve having a first inlet, a first outlet and a second outlet. The first inlet is connected to the outlet of the hot water circuit 21, the first outlet is connected to the circulating water inlet 102 through a reflux pipe 13, and the second outlet is connected to the water outlet module 40 through a pipe. The first dual-channel solenoid valve 50 has a first state in which the first inlet is connected to the first outlet, and a second state in which the first inlet is connected to the second outlet. When the circulating heating mode is performed, the first dual-channel solenoid valve 50 switches to the first state to connect the circulating branch. The hot water flowing out through the first outlet enters the clean water pump 11 in sequence through the reflux pipe 13, the circulating water inlet 102, and the water inlet pipe 12 between the circulating water inlet 102 and the water inlet, and then is pumped into the cold water circuit 22, the heating module 30, and the hot water circuit 21 of the heat exchange module 20 in sequence through the clean water pump 11 to realize circulating heating. The entire circulation branch is heated by circulating the boiling water heated by the heating module 30 through the provided reflux pipeline 13 , so as to ensure the temperature of the water stored in the heat exchange module 20 .

[0099] It should be noted that, in this embodiment, the water supply module 10 includes a water supply system with a filter element for real-time water purification or a water supply system without a filter element and without real-time purification. The water purification pump 11 is preferably a water purification micro pump.

[0100] In some embodiments, the first dual-channel solenoid valve 50 further has a first inlet and a second outlet; the outlet of the hot water circuit 21 is connected to the first inlet through a first pipeline 1a, and the second outlet is connected to the water outlet module 40 through a second pipeline 2a. The clean water outlet 101 is connected to the inlet of the cold water circuit 22 through a third pipeline 3a, and the outlet of the cold water circuit 22 is connected to the inlet of the heating module 30 through a fourth pipeline 4a.

[0101] In some embodiments, the water outlet module 40 includes a water outlet 42 and a regulating valve 41. The regulating valve 41 is arranged upstream of the water outlet 42 and is used to adjust the water outlet temperature of the water outlet 42. The regulating valve 41 has a first regulating water inlet, a second regulating water inlet, and a regulating water outlet; wherein the first regulating water inlet is connected to the outlet end of the hot water circuit 21, the second regulating water inlet is connected to the water outlet end of the heating module 30, and the regulating water outlet is connected to the inlet of the water outlet 42.

[0102] In the above embodiment, through the regulating valve 41 that is set, a part of the boiled water after being boiled by the heating module 30 flows to the water outlet 42 through the regulating valve 41, and the other part is input into the hot water circuit 21 of the heat exchange module 20, and is cooled by heat exchange with the normal temperature purified water in the cold water circuit 22 to form low-temperature cooked water, and flows to the water outlet 42 through the regulating valve 41. The mixing ratio of boiled water and low-temperature cooked water is controlled by the regulating valve 41, which can meet the user's demand for cooked water at different temperatures.

[0103] Specifically, the regulating valve 41 is a stepless regulating type, the outlet of the heating module 30 is connected to the second regulating water inlet through the fifth pipeline 5a, and the fifth pipeline 5a is connected to the inlet of the hot water circuit 21 through the sixth pipeline 6a. The boiled water after being boiled by the heating module 30 can flow to the regulating valve 41 through the fifth pipeline 5a, or can also flow to the hot water circuit 21 through the sixth pipeline 6a for cooling and then flow to the regulating valve 41 through the second pipeline 2a. The proportion of boiled water flowing into the sixth pipeline 6a, i.e., the hot water circuit 21, can be controlled by the provided regulating valve 41. For example, the boiled water heated by the heating module 30 can be controlled to flow into the sixth pipeline 6a, cooled by the heat exchange module 20, and then flow out from the water outlet module 40 for user use, or half of the boiled water can be controlled to flow into the water outlet 42 through the fifth pipeline 5a, and the other half of the boiled water can flow into the heat exchange module 20 through the sixth pipeline 6a for cooling and cooling. The regulating water outlet is connected to the water outlet nozzle 42 via a seventh pipe 7a.

[0104] Specifically, the fifth pipeline 5a includes a first pipe section located between the heating module 30 and the sixth pipeline 6a, and a second pipe section located between the sixth pipeline 6a and the regulating valve 41. The circulation branch sequentially connects the clean water outlet 101 of the clean water pump 11, the second dual-channel solenoid valve 60, the cold water circuit 22, the heating module 30, the hot water circuit 21, the first dual-channel solenoid valve 50, and the circulating water inlet 102 of the clean water pump 11. Specifically, in combination with Figure 2 , Figure 3 As shown, the circulation branch includes the third pipeline 3a, the fourth pipeline 4a, the first pipe section of the fifth pipeline 5a, the sixth pipeline 6a, the first pipeline 1a and the return pipeline 13, and the water inlet pipeline 12 located between the circulating water inlet 102 and the clean water pump 11.

[0105] In some embodiments, the heat exchange module 20 includes an inner heat exchange tube 202 and an outer heat exchange tube 201, and the internal flow channel of the inner heat exchange tube 202 constitutes a hot water circuit 21; the inner heat exchange tube 202 is inserted into the outer heat exchange tube 201, and the flow channel between the inner heat exchange tube 202 and the outer heat exchange tube 201 constitutes a cold water circuit 22; the inner diameter of the outer heat exchange tube 201 is set to d1, and the inner diameter of the inner heat exchange tube 202 is set to d2, wherein 3.5d2≥d1≥2.5d2.

[0106] In the above embodiment, the heat exchange module 20 is based on the shell-and-tube heat exchanger structure, and the hot and cold fluids are respectively passed through the inner and outer tubes. In the normal boiled water mode, the hot water passes through the inner heat exchange tube 202, and the cooling water passes through the outer heat exchange tube 201, so as to achieve instant cooling, thereby achieving non-contact heat exchange and temperature change of the two fluids. In the large-flow boiling water mode, the normal temperature water passes through the outer heat exchange tube 201 and the inner heat exchange tube 202 for heat exchange preheating and temperature rise. By designing the inner diameter d1 of the outer heat exchange tube 201 and the inner diameter d2 of the inner heat exchange tube 202 within the ratio range of 3.5d2≥d1≥2.5d, the heat exchange module 20 can not only perform heat exchange, but also greatly increase the water storage capacity, and can also be used as a water tank or hot tank to store water. The heat exchange module 20 integrates the functions of water storage and heat exchange, and has multiple uses, further simplifying the structure.

[0107] Preferably, d1=3d2. Compared with the existing design in which the cold water channel 22 and the hot water channel 21 have the same size, the size of the cold water channel 22 is approximately twice that of the hot water channel 21. After the outer tube diameter is increased, the water storage capacity of the heat exchange module 20 is greatly increased.

[0108] In this embodiment, the boiled water heated by the heating module 30 can flow out directly through the water outlet module 40, and the user can directly use the boiled water; or the boiled water heated by the heating module 30 can be mixed with the boiled water directly coming out of the heating module 30 to a set temperature after being heat exchanged by the heat exchange module 20 for use by the user; or, the boiled water heated by the heating module 30 circulates in a circulation branch formed by connecting the clean water outlet 101 of the water supply module 10, the cold water circuit 22, the heating module 30, the hot water circuit 21, and the circulating water inlet 102 of the water supply module 10 in sequence, so as to realize the heat preservation function.

[0109] In some embodiments, in combination Figure 1 , Figure 2 , Fig.10As shown, the heat exchange inner tube 202 adopts a serpentine tube, and the heat exchange outer tube 201 adopts a spliced ​​shell structure. The heat exchange outer tube 201 has two half shells that are interlocked with each other. At least one of the two half shells is provided with a serpentine channel 2010. The serpentine heat exchange inner tube 202 is embedded in the serpentine channel 2010 of one half shell, and then the other half shell is buckled to form a closed flow channel. There is a set gap between the serpentine channel 2010 and the heat exchange inner tube 202, and the gap constitutes a cold water channel 22.

[0110] In some embodiments, the heating module 30 includes a heating element 31 and a first temperature sensing package 32 , the first temperature sensing package 32 is used to detect the heating temperature of the heating element 31 ; the heat exchange module 20 also includes a second temperature sensing package, the second temperature sensing package is used to detect the water temperature in the heat exchange module 20 .

[0111] In the above embodiment, the first temperature sensing package 32 is provided to monitor the heating temperature of the heating element 31, thereby avoiding the problem of not being able to promptly detect abnormal conditions in the heating temperature of the heating element 31. The second temperature sensing package is provided to monitor the water temperature in the heat exchange module 20, thereby ensuring that the water temperature in the heat exchange module 20 is not lower than the set temperature in the insulation mode.

[0112] Preferably, the heating module 30 is an instant heating element 31 having the functions of rapid, stable heating and adjustable power. After purified water with different parameters is input into the heating element 31, the control system starts the heating element 31 according to the sensor parameters and adjusts the corresponding power parameters to heat the purified water to boiling point.

[0113] Specifically, the heating element 31 includes a heating tube with a heating channel therein, and water is heated when flowing through the heating channel. The first temperature sensing bag 32 is arranged downstream of the heating element 31. The second temperature sensing bag can be arranged in the heat exchange outer tube 201 or in the heat exchange inner tube 202, or can be arranged at the water outlet of the heat exchange outer tube 201 and the heat exchange inner tube 202; or, in some more preferred embodiments, there are two second temperature sensing bags, and the two second temperature sensing bags are respectively arranged in the heat exchange outer tube 201 and the heat exchange inner tube 202, and the water storage temperature or real-time temperature of the heat exchange module 20 is based on the average value of the temperatures detected by the two second temperature sensing bags, and the temperature measurement is more accurate.

[0114] In some embodiments, in combination Figures 5 to 8 As shown, the clean water outlet 101 is selectively connected to the cold water circuit 22 and the inlet end of the heating module 30 through the second dual-channel solenoid valve 60 .

[0115] In the above embodiment, by setting up the second dual-channel solenoid valve 60, it is convenient to switch and control the water flowing out of the clean water outlet 101 of the water supply module 10 to enter the cold water path 22 of the heat exchange module 20, or directly enter the heating module 30 for heating.

[0116] In some embodiments, the second dual-channel solenoid valve 60 has a second inlet, a third outlet and a fourth outlet; the clean water outlet 101 is connected to the second inlet through the first pipe section of the third pipeline 3a, the third outlet is connected to the inlet of the cold water circuit 22 through the second pipe section of the third pipeline 3a, and the fourth outlet is connected to the fourth pipeline 4a through the eighth pipeline 8a.

[0117] In the above embodiment, the second dual-channel solenoid valve 60 is a one-inlet and two-outlet type solenoid valve, and the second dual-channel solenoid valve 60 has a third state in which the second inlet is connected to the third outlet, and a fourth state in which the second inlet is connected to the fourth outlet. When the circulation heating mode is performed, the first dual-channel solenoid valve 50 is switched to the first state, and the second dual-channel solenoid valve 60 is switched to the third state to conduct the entire circulation branch. When the circulation heating mode is performed, by switching the second dual-channel solenoid valve 60 to a state in which the clean water pump 11, the cold water circuit 22, and the heating module 30 are connected, the circulating water can enter the heating module 30 for heating after flowing through the cold water circuit 22 of the heat exchange module 20. Compared with directly entering the heating module 30 for heating through the sixth pipeline 6a, the heat loss is reduced, the heat in the heat exchange module 20 can be fully utilized, and the purpose of saving energy consumption is achieved, the heating speed is faster, and the insulation effect is better.

[0118] The specific structure and principle of the water purification equipment of this embodiment are introduced below.

[0119] The water purification device provided in this embodiment includes a water supply module 10, a heating module 30, a heat exchange module 20, a control module and related supporting structures.

[0120] Specifically, the water supply module 10, the heating module 30, and the heat exchange module 20 have one or more water inlet ends and water outlet ends. The water inlet end of the water supply module 10 is connected to the raw water source, and the clean water outlet end of the water supply module 10 has a clean water outlet 101, and the clean water outlet 101 is connected to the second dual-channel solenoid valve 60. One outlet of the second dual-channel solenoid valve 60 is connected to the inlet of the cold water circuit 22 of the heat exchange module 20, and the outlet of the cold water circuit 22 is connected to the water inlet end of the heating module 30. The heating module 30 The first water outlet is connected to the inlet of the hot water circuit 21 of the heat exchange module 20, the second water outlet of the heating module 30 is connected to the second regulating water inlet of the regulating valve 41, the outlet of the heat exchange inner tube 202 is connected to the circulating water inlet 102 of the clean water pump 11 via the first dual-channel solenoid valve 50, and the boiling water circulation can be used to heat the entire pipeline to ensure that the stored water temperature is boiling water. The heat exchange inner tube 202 is connected to the first regulating water inlet via the first dual-channel solenoid valve 50, and the water outlet of the regulating valve 41 is connected to the water outlet 42 of the whole machine.

[0121] Furthermore, the water supply module 10 has different system characteristics according to the quality of the raw water. When the raw water is of drinking water quality, the water supply module 10 may be without a purification system, and only the normal temperature purified water is transported from the water outlet of the water supply module 10 to the water inlet of the heat exchange outer tube 201 of the heat storage heat exchange module 20, the water outlet of the heat exchange outer tube 201, the heating module 30, the water inlet of the heat exchange inner tube 202, the water outlet of the heat exchange inner tube 202, and the water outlet 42 through a conveying device (such as a pressure-stabilizing pump); when the raw water quality is non-drinking water quality, the water supply module 10 may have a corresponding purification system to transport the purified water from the water outlet of the water supply module 10 to the water inlet of the heat exchange outer tube 201 of the heat storage heat exchange module 20, the water outlet of the heat exchange outer tube 201, the heating module 30, the water inlet of the heat exchange inner tube 202, the water outlet of the heat exchange inner tube 202, and the water outlet 42; ... The raw water quality purification meets the drinking standard. The purification system can have a single or combined form of a pretreatment module and a deep treatment module. The pretreatment realizes the preliminary filtration of the water to remove pollutants such as sediment, rust, and residual chlorine. It can be a combination or composite form of a primary filter element and an activated carbon filter element. The primary filter element can be a PP cotton filter element or an ultrafiltration filter element. The activated carbon filter element can be a granular activated carbon, carbon fiber or carbon rod filter element; the deep treatment module realizes the deep filtration of the water to remove heavy metals, microorganisms and other toxic and harmful substances. It can be a combination of ultrafiltration, nanofiltration or reverse osmosis filtration modules. The room temperature outlet water of the purification system can be transported to the water inlet end of the heating module 30 and the cooling water inlet of the heat exchange module 20 through the conveying equipment and the dual-channel solenoid valve.

[0122] Furthermore, the heat exchange module 20 may be in the form of a casing, immersion or other structural forms. Preferably, the heat exchange module 20 is a casing heat exchange structure (for example, during operation, boiling clean water and multi-temperature clean water are respectively input into the water inlet end of the heat exchange inner tube 202 and the water inlet end of the heat exchange outer tube 201, and the boiling clean water and the multi-temperature clean water are separated by a heat-conducting material. The boiling clean water is cooled down and the multi-temperature clean water is heated up by heat transfer. The control module controls the operating parameters (for example, flow rate, contact time, etc.) of the heat exchange module 20 and the power of the heating element 31 and the opening and closing degree of the regulating valve 41 by detecting the corresponding clean water parameters (for example, water temperature, flow rate, etc.) and multi-temperature clean water parameters (temperature, volume, etc.), so as to realize Timely delivery of fresh boiled water at different temperature ranges and flow rates is realized. In this embodiment, the heat exchange module 20 integrates the functions of water storage and heat exchange. The heat exchange module 20 is based on the shell and tube heat exchanger structure, and the cold and hot fluids are respectively passed through the inner and outer tubes, thereby realizing non-contact heat exchange and temperature change of the two fluids; by optimizing the size and structural design of the heat exchange module 20, both water storage and heat exchange can be achieved. In the boiled water function, hot water passes through the hot water water path 21 inside the shell, and cooling water passes through the hot water water path 21 outside the shell, realizing instant cooling. In the large-flow boiled water function, normal temperature water passes through the cold water water path 22 and exchanges heat with the hot water stored in the hot water water path 21 to realize instant preheating and temperature rise.

[0123] Furthermore, the heating module 30 has a power-adjustable heating element 31, which can be a PTC heating element, a rare earth thick film heating element, or a metal heating tube, etc. The purified water in contact with the heating element 31 is heated and boiled by heating, and the heating power of the heating element 31 is controlled and adjusted by the control module according to the detected sensor parameters. The system can change the water inlet temperature of the heat exchange inner tube 202 by adjusting the power of the heating element 31 or the pump flow, thereby realizing the continuous supply of cooked water.

[0124] Furthermore, the water supply module 10 provides normal temperature purified water required for drinking. After being pressurized by the water purification pump 11, the purified water enters the heat exchange outer tube 201 at a set flow rate and then enters the heating module 30. After being boiled by the heating module 30, a part of it flows to the outlet of the water outlet nozzle 42 through the regulating valve 41, and the other part is input to the water inlet end of the heat exchange inner tube 202. After heat exchange and cooling with normal temperature purified water in the heat exchange module 20, it flows to the outlet of the water outlet nozzle 42 through the regulating valve 41. The low-temperature cooked water and boiled water are mixed in proportion through the regulating valve 41 to meet the user's different temperature boiled water needs. The control system collects relevant sensor parameters according to the user's different temperature and flow boiled water needs, and then controls the water supply parameters, heating parameters, and heat exchange parameters to achieve the required boiled water output.

[0125] Furthermore, the control module senses the operating parameters and environmental parameters of various sensors (for example, the first temperature sensing package 32 provided at the heating module 30, the second temperature sensing package provided in the heat exchange module 20, the temperature sensor provided at the water outlet 42, and the water level sensor provided in the water tank of the whole machine), and selects different control logics to run according to user needs, starts and stops the corresponding conveying equipment, and adjusts the operating parameters of different modules to output boiled water to meet user needs. The control module can control the output power or start time of the raw water self-priming pump, the start and stop or output power of the water purification pump 11, the output power of the heating element 31, etc., to realize functions such as large-flow boiled water and cooked water supply.

[0126] In this embodiment, when the insulation mode is started and the user does not take water, when the second temperature sensing package detects that the water temperature in the heat exchange outer tube 201 of the heat exchange module 20 is ≤70°C, the first dual-channel solenoid valve 50 and the second dual-channel solenoid valve 60 are both cut into the circulation branch, and the clean water pump 11 draws and pushes 70°C hot water in the inner and outer tubes at a flow rate of 1L / min, and heats it to 100°C boiling water through the 2100w heating element 31, and then circulates and heats the water in the inner and outer tubes until it is all 100°C and stops heating. The clean water pump 11 controls the heating to 100°C, and circulates through the heat exchange inner tube 202 and the heat exchange outer tube 201 in turn to raise the water temperature of the entire heat exchange module 20 to 100°C.

[0127] Furthermore, while ensuring that the water storage temperature of the heat exchange module 20 is ≥70°C and there is no cold working condition, when the user takes cooked water, the first dual-channel solenoid valve 50 and the regulating valve 41 are cut to the cooked water branch, and the clean water pump 11 pushes the clean water at room temperature into the heat exchange outer tube 201 at a set flow rate, and is heated to 100°C boiling water by the 2100w heating element 31. A part of the boiled water flows into the heat exchange inner tube 202 and is cooled to 45°C. The 100°C boiling water and the 45°C cooked water are mixed through the regulating valve 41 to the set temperature and flow out.

[0128] The heat exchange module 20 provided in this embodiment has water storage and heat exchange functions, which is equivalent to a hot tank and a heat exchanger. Combined with logical methods to control the start, stop and operating parameters of different system components, it can realize zero cold water multi-temperature stage instantaneous preparation and large-scale continuous supply of boiled water, truly meeting the drinking habits of Chinese people.

[0129] Although the embodiments of the present invention are described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations shall all fall within the protection scope of the embodiments of the present application.

Claims

1. A method for preparing boiled water with zero cold water for a water purification device, characterized in that: The water purification equipment comprises: A water supply module (10) having a clean water outlet (101) and a circulating water inlet (102); The heat exchange module (20) has a hot water circuit (21) and a cold water circuit (22) which are independent of each other and capable of heat exchange; A heating module (30), wherein the outlet end of the heating module (30) is respectively connected to the inlet end of the hot water circuit (21) and the water outlet module (40) of the water purification equipment; The purified water outlet (101) is connected to the inlet end of the cold water circuit (22), the outlet end of the cold water circuit (22) is connected to the inlet end of the heating module (30), and the outlet end of the hot water circuit (21) is selectively connected to the water outlet module (40) and the circulating water inlet (102); The water purification equipment has a heat preservation mode, a circulation heating mode and a zero cold water cooked water preparation mode, and the zero cold water cooked water preparation method comprises the following steps: Enter the keep warm mode; If it is monitored during the heat preservation process that the water temperature T of the heat exchange module (20) is less than or equal to the set temperature T0, the outlet end of the hot water circuit (21) is controlled to switch to a state of being connected to the circulating water inlet (102), and the heating module (30) is controlled to start and enter a circulating heating mode, so that the water temperature in the heat exchange module (20) is maintained above the set temperature T0; When a cooked water taking signal is received during the heat preservation process, the outlet end of the hot water circuit (21) is controlled to switch to a state of being connected to the water outlet module (40), thereby entering a zero cold water cooked water preparation mode; and controlling the water supply module (10) to transport external water to the heating module (30) through the cold water channel (22) of the heat exchange module (20), and heating the water to 100° C. through the heating module (30); Then, part of the heated boiled water is controlled to flow into the hot water circuit (21) for heat exchange cooling, and the other part directly flows into the water outlet module (40) and is adjusted to the target temperature with the cooked water flowing out of the hot water circuit (21) for use by users.

2. The method for preparing boiled water with zero cold water for water purification equipment according to claim 1, characterized in that: The zero cold water cooked water preparation mode specifically includes the following steps: Controlling the water supply module (10) to deliver the normal temperature purified water to the cold water circuit (22) according to the first set flow rate Q1 to exchange heat with the hot water in the hot water circuit (21), and the water after the heat exchange is heated to 100° C. by the heating module (30); A portion of the boiled water heated by the heating module (30) is controlled to flow into the hot water path (21) to be cooled to 45°C, while the other portion and the 45°C cooked water flowing out of the hot water path (21) are adjusted to the target temperature by the regulating valve (41) and then provided to the user.

3. The method for preparing boiled water with zero cold water for water purification equipment according to claim 1, characterized in that: The cycle heating mode specifically includes the following steps: Controlling a circulation branch connected between the purified water outlet (101) of the water supply module (10), the cold water circuit (22), the heating module (30), the hot water circuit (21), and the circulating water inlet (102) of the water supply module (10) to be in a conducting state; The water supply module (10) is controlled to drive the water in the cold water circuit (22) and the hot water circuit (21) to circulate in sequence into the heating module (30) for heating according to the second set flow rate Q2, and the heating is stopped when the water temperature in the cold water circuit (22) and the hot water circuit (21) both reaches 100°C.

4. The method for preparing boiled water with zero cold water for a water purification device according to any one of claims 1 to 3, characterized in that: The set temperature T0 is 70° C.; and / or the power of the heating module (30) is 2100 W.

5. A water purification device, characterized in that: The cooked water is prepared by the method for preparing cooked water using zero cold water as described in any one of claims 1 to 4.

6. The water purification device according to claim 5, characterized in that: The outlet end of the hot water circuit (21) is selectively connected to the water outlet module (40) and the circulating water inlet (102) via a first dual-channel solenoid valve (50).

7. The water purification device according to claim 6, characterized in that: The water supply module (10) comprises: A clean water pump (11), the clean water pump (11) having a water inlet and the clean water outlet (101), the water inlet being connected to an external water source via a water inlet pipeline (12); The circulating water inlet (102) is located on the water inlet pipeline (12), and the first outlet of the first dual-channel solenoid valve (50) is connected to the circulating water inlet (102) via a return pipeline (13).

8. The water purification device according to claim 7, characterized in that: The first dual-channel solenoid valve (50) also has a first inlet and a second outlet; The outlet of the hot water circuit (21) is connected to the first inlet via a first pipeline (1a), and the second outlet is connected to the water outlet module (40) via a second pipeline (2a).

9. The water purification device according to any one of claims 5 to 8, characterized in that: The water outlet module (40) comprises: A water outlet (42); A regulating valve (41) is arranged upstream of the water outlet nozzle (42) and is used to adjust the outlet water temperature of the water outlet nozzle (42). The regulating valve (41) has a first regulating water inlet, a second regulating water inlet, and a regulating water outlet; Wherein, the first regulating water inlet is connected to the outlet end of the hot water circuit (21), the second regulating water inlet is connected to the water outlet end of the heating module (30), and the regulating water outlet is connected to the inlet of the water outlet nozzle (42).

10. The water purification device according to any one of claims 5 to 8, characterized in that: The heat exchange module (20) comprises: A heat exchange inner tube (202), the inner flow passage of which constitutes the hot water circuit (21); A heat exchange outer tube (201), the heat exchange inner tube (202) being sleeved inside the heat exchange outer tube (201), and the flow channel between the heat exchange inner tube (202) and the heat exchange outer tube (201) forming the cold water circuit (22); The inner diameter of the heat exchange outer tube (201) is set to d1, and the inner diameter of the heat exchange inner tube (202) is set to d2, wherein 3.5d2≥d1≥2.5d2.

11. The water purification device according to any one of claims 5 to 8, characterized in that: The heating module (30) comprises a heating element (31) and a first temperature sensing package (32), wherein the first temperature sensing package (32) is used to detect the heating temperature of the heating element (31); And / or, the heat exchange module (20) further comprises a second temperature sensing package, wherein the second temperature sensing package is used to detect the temperature of stored water in the heat exchange module (20).

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