Liquid heating device and liquid heating equipment

Abstract

The utility model relates to the technical field of hot water electric appliances, and provides a liquid heating device and liquid heating equipment. The liquid heating device comprises a water tank, a temperature adjusting water tank and a switching valve. The water tank is provided with a main heating assembly, the temperature adjusting water tank is provided with a temperature adjusting assembly, the switching valve is switched between a first communication state and a second communication state, and in the first communication state, the switching valve connects the water tank with a water outlet of the liquid heating device and disconnects the water tank from the temperature adjusting water tank; in the second communication state, the switching valve disconnects the water tank and the water outlet, the temperature adjusting water tank communicates with the water tank and the water outlet, and a communicating vessel is formed between the temperature adjusting water tank and the water tank. According to the liquid heating device, the temperature adjusting water tank capable of forming the communicating vessel with the water tank is arranged, and the switching valve is arranged between the water tank and the temperature adjusting water tank, so that the switching valve can be switched between two communicating states, and the water temperature can be adjusted through the water tank and the temperature adjusting water tank together; therefore, the temperature of water at the water outlet is adjusted.

Description

Technical Field

[0001] The utility model relates to the technical field of household appliances, in particular to a liquid heating device and liquid heating equipment. Background Art

[0002] When boiling water in liquid heating equipment, such as electric kettles or coffee pots, the water cannot be drunk or used immediately after it is boiled. It takes some time for the water to cool down to a certain temperature before it is suitable for drinking. In addition, when brewing milk powder, brewing coffee or doing experiments in the laboratory, a specific temperature is sometimes required, which requires users to spend a lot of time waiting for the hot water to cool down. For example, it takes about 10 hours for the water in a 5L electric kettle to cool down from boiling to 45℃ naturally. If the lid is opened for cooling, the water in the electric kettle is easily contaminated by the outside world.

[0003] In the related art, a fan is arranged in the electric kettle, and the fan is used to cool the water in the water tank, which takes a long time and wastes energy. Utility Model Content

[0004] The utility model aims to solve at least one of the technical problems existing in the related art. To this end, the utility model provides a liquid heating device, which can accelerate the adjustment of the water temperature of the water outlet.

[0005] The utility model also provides a liquid heating device.

[0006] The utility model provides a liquid heating device, comprising:

[0007] A water tank, wherein the water tank is provided with a main heating assembly;

[0008] A temperature-adjusting water tank, wherein the temperature-adjusting water tank is provided with a temperature-adjusting component, and the volume of the temperature-adjusting water tank is smaller than the volume of the water tank;

[0009] a switching valve, the switching valve switching between a first connection state and a second connection state, in which the switching valve conducts the water tank and the water outlet of the liquid heating device, and disconnects the water tank and the temperature-adjusting water tank; in the second connection state, the switching valve disconnects the water tank and the water outlet, the temperature-adjusting water tank connects the water tank and the water outlet, and a communicating vessel is formed between the temperature-adjusting water tank and the water tank;

[0010] A water pump, in the first connected state, the water pump connects the water tank and the water outlet; in the second connected state, the water pump connects the temperature-adjusting water tank and the water outlet.

[0011] According to the liquid heating device provided by the utility model, a thermostatic water tank is provided which can form a communicating vessel with a water tank, and a switching valve is provided between the water tank and the thermostatic water tank, so that the switching valve can be switched between two connected states. In this way, the water temperature can be adjusted jointly by the water tank and the thermostatic water tank, thereby adjusting the temperature of the water at the water outlet.

[0012] According to an embodiment of the utility model, a communicating vessel is formed between the temperature-adjusting water tank and the water tank, and the highest water level of the temperature-adjusting water tank is lower than the lowest water level of the water tank.

[0013] According to one embodiment of the utility model, the temperature regulating water tank is provided with an atmosphere connecting pipeline, which connects the temperature regulating water tank with the outside world. A first one-way valve is provided on the atmosphere connecting pipeline, which conducts one-way along the temperature regulating water tank toward the outside world.

[0014] According to an embodiment of the utility model, a second one-way valve is provided between the temperature-adjusting water tank and the water pump, and the second one-way valve is unidirectionally conducted along the temperature-adjusting water tank toward the water pump.

[0015] According to an embodiment of the present utility model, the water pump is a diaphragm pump.

[0016] According to an embodiment of the utility model, a water outlet box is provided at the water outlet, and the water outlet box is suitable for mixing the water in the water tank and the temperature regulating water tank.

[0017] According to an embodiment of the present invention, the temperature adjustment component includes at least one of a temperature reduction unit and an auxiliary heating unit.

[0018] The cooling unit includes a fan disposed on the temperature-adjusting water tank, and / or,

[0019] The volume of the temperature regulating water tank is smaller than the volume of the water tank.

[0020] According to an embodiment of the utility model, the water tank is provided with a first temperature sensor, the temperature-adjusting water tank is provided with a second temperature sensor, and the water outlet box is provided with a third temperature sensor.

[0021] and / or,

[0022] The temperature regulating water tank is provided with a water level monitoring unit.

[0023] According to one embodiment of the utility model, the liquid heating device has a hot water outlet mode, a warm water outlet mode and a temperature adjustment mode. In the hot water outlet mode, the third temperature sensor displays the temperature of the first temperature sensor; in the warm water outlet mode, the third temperature sensor displays the temperature of the second temperature sensor; in the temperature adjustment mode, the temperature displayed by the third temperature sensor is adjustable, and the time ratio of the switching valve between the first connected state and the second connected state is adjusted so that the third temperature sensor can reach the desired temperature.

[0024] The utility model also provides a liquid heating device, comprising:

[0025] case;

[0026] The above-mentioned liquid heating device is arranged in the shell.

[0027] The liquid heating device provided by the utility model includes the above-mentioned liquid heating device and thus also has the beneficial effects of the above-mentioned liquid heating device, which will not be described in detail here.

[0028] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0030] Figure 1 It is a structural schematic diagram of the liquid heating device provided by the utility model.

[0031] Reference numerals:

[0032] 100, water tank; 110, main heating component; 120, first temperature sensor;

[0033] 200, temperature-adjusting water tank; 210, temperature-adjusting assembly; 211, fan; 212, heating wire; 220, atmosphere communication pipeline; 221, first one-way valve; 230, second temperature sensor;

[0034] 300, switching valve;

[0035] 400, water pump; 401, second one-way valve;

[0036] 500, water outlet box; 510, third temperature sensor;

[0037] 600. Control the display panel. DETAILED DESCRIPTION

[0038] The following is a further detailed description of the implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but cannot be used to limit the scope of the present invention.

[0039] In the description of the embodiments of the present utility model, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the embodiments of the present utility model. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0040] In the description of the embodiments of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present utility model can be understood according to specific circumstances.

[0041] In the embodiments of the present invention, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0042] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model embodiment. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0043] like Figure 1 As shown, the utility model provides a liquid heating device, including a water tank 100, a temperature-adjusting water tank 200, a switching valve 300 and a water pump 400. It should be noted that the liquid heating device provided by the utility model can be provided in a device with a liquid heating function, such as an electric kettle, a coffee machine and other heating devices that need to control the water temperature.

[0044] Specifically, the water tank 100 is provided with a main heating component 110, which can heat the water in the water tank 100. In some examples, the main heating component 110 can be a main heating wire 212 set at the bottom of the water tank 100, or a heating tube or other heating device. The thermostatic water tank 200 is provided with a thermostatic component 210, which can adjust the temperature of the water in the thermostatic water tank 200, such as heating or cooling the water in the thermostatic water tank 200. Among them, the volume of the thermostatic water tank 200 is smaller than the volume of the water tank 100, which can reduce the occupied space inside the device and improve the space utilization rate inside the device.

[0045] The switching valve 300 switches between a first connected state and a second connected state. In the first connected state, the switching valve 300 connects the water tank 100 and the water outlet of the liquid heating device, and disconnects the water tank 100 from the thermostatic water tank 200. In this way, the water in the water tank 100 can flow directly to the water outlet. For example, when boiling water is needed, the switching valve 300 can be switched to the first connected state.

[0046] In the second communication state, the switching valve 300 disconnects the water tank 100 and the water outlet, and the temperature-adjusting water tank 200 connects the water tank 100 and the water outlet.

[0047] In the first connection state, the water pump 400 connects the water tank 100 with the water outlet to pump the water in the water tank 100 into the water outlet, so that the user can quickly obtain a large amount of hot water. In the second connection state, the water pump 400 connects the thermostatic water tank 200 with the water outlet to pump the water in the thermostatic water tank 200 into the water outlet. This is suitable for situations where constant and specific temperature hot water is required, such as cooking, bathing, or specific types of beverage preparation.

[0048] The water pump 400 can increase the pressure and flow of the water flow, ensuring that water can be efficiently supplied to a distant or high-position water outlet. The water pump 400 can quickly respond to user needs without waiting for the slow movement of water under natural pressure or gravity. In addition, due to the presence of the water pump 400, the liquid heating device can more easily adapt to different installation conditions and pipeline layouts, without being limited by the location of the water tank. In some commercial scenarios, the water pump 400 can ensure that the liquid heating device can continuously and stably supply hot water during high-demand periods.

[0049] In this way, users can obtain hot water of suitable temperature according to different needs, for example, brewing milk powder, or making different types of tea or coffee. This temperature adjustment function is very suitable for beverage making, because some beverages require a specific water temperature for the best taste. In addition, by adjusting the state of the switching valve 300, the system can be switched quickly, so that users can instantly obtain hot water in the water tank 100 or water of suitable temperature adjusted by the thermostatic water tank 200. This flexibility improves the convenience and response speed of the system. In the second connected state, the existing water temperature in the thermostatic water tank 200 can be used to shorten the heating or cooling time, which can reduce energy consumption and improve the utilization rate of thermal energy. Since non-boiling hot water can be provided, users are prevented from directly contacting boiling water, reducing the risk of scalding.

[0050] This system can be used not only in household appliances, but also in commercial and industrial environments, such as coffee shops, laboratories or medical environments where water temperature needs to be controlled.

[0051] According to the liquid heating device provided by the utility model, a thermostatic water tank 200 is provided which can form a communicating vessel with the water tank 100, and a switching valve 300 is provided between the water tank 100 and the thermostatic water tank 200, so that the switching valve 300 can be switched between two communicating states. In this way, the water temperature can be adjusted jointly by the water tank 100 and the thermostatic water tank 200, thereby adjusting the temperature of the water at the water outlet.

[0052] like Figure 1As shown, in some embodiments of the utility model, the switching valve 300 can be a solenoid valve, which can be switched between position A and position B. When the solenoid valve is switched to position A, it is in the first connected state. When the solenoid valve is switched to position B, it is in the second connected state. The solenoid valve can be remotely controlled by an electrical signal without manual intervention, which allows the entire liquid heating device to automatically switch to a preset or user-selected working state. The solenoid valve can accurately control the flow of water, ensuring that the hot water in the water tank 100 flows directly to the user in the first connected state, and in the second connected state, the hot water in the water tank 100 first flows to the thermostatic water tank 200 for temperature adjustment before being output.

[0053] In addition, in some other embodiments of the utility model, the solenoid valve can also be switched to the C position (not shown in the figure). In the C position, the connection between the water tank 100 and the water outlet is cut off, and the connection between the water tank 100 and the thermostatic water tank 200 is also cut off, that is, the water tank 100 is prevented from supplying water to the outside. In the C position, the water tank 100 no longer supplies water to the outside, even if the water in the thermostatic water tank 200 is being used. This can prevent dry burning caused by too low water level in the water tank 100 and avoid damage to the water tank 100.

[0054] like Figure 1 As shown, in some embodiments of the present invention, a communicating vessel is formed between the temperature-controlled water tank 200 and the water tank 100, so that the water in the water tank 100 can automatically flow to the temperature-controlled water tank 200 according to its own gravity, and after being temperature-controlled in the temperature-controlled water tank 200, it flows to the water outlet to supply water of suitable temperature to the user. The highest water level of the temperature-controlled water tank 200 is lower than the lowest water level of the water tank 100, so that it can be ensured that the water in the water tank 100 will definitely flow into the temperature-controlled water tank 200, and the water level difference between the water tanks can utilize the gravity to ensure a stable water flow from the water tank 100 to the temperature-controlled water tank 200 without the need for additional pumping equipment.

[0055] like Figure 1As shown, in some embodiments of the present invention, the temperature-controlled water tank 200 is provided with an atmosphere communication pipeline 220, and the atmosphere communication pipeline 220 connects the temperature-controlled water tank 200 with the outside world, and a first one-way valve 221 is provided on the atmosphere communication pipeline 220. Among them, the first one-way valve 221 only allows the air inside the temperature-controlled water tank 200 to communicate with the outside atmosphere, which helps to balance the internal and external pressures and avoid the internal pressure difference caused by water heating and cooling. In addition, the first one-way valve 221 can prevent the outside atmosphere from entering the temperature-controlled water tank 200, so that when the switching valve 300 is in the first communication state, the pressure in the temperature-controlled water tank 200 is in a negative pressure state, thereby preventing the water in the temperature-controlled water tank 200 from being sucked into the water outlet, and further preventing the water in the temperature-controlled water tank 200 from mixing with the water in the water tank 100. In addition, when an unexpectedly high pressure occurs in the system, the first one-way valve 221, as a safety exhaust mechanism, can release the excess pressure into the atmosphere to avoid container rupture or other safety problems caused by excessive pressure.

[0056] like Figure 1 As shown, in some embodiments of the present invention,

[0057] Among them, in some embodiments of the utility model, the water pump 400 is a diaphragm pump. The diaphragm pump can provide a gentle, pulsed flow, and this gentle pumping is very helpful in maintaining the water temperature in the system stable. In addition, the diaphragm pump can run dry without damage in a liquid-free state, which adds a safety factor to the system, especially when an unexpected situation causes the water tank to be dry. The diaphragm pump is usually self-priming and can start and suck water even when there is no positive pressure at the inlet of the water pump 400. Since the diaphragm pump can provide sufficient suction, there is no need to design the entire system into a closed state, which simplifies the system design and reduces the difficulty of maintenance. The diaphragm pump design is capable of handling liquids containing fine particles, and is not as easily damaged by particles as other pumps.

[0058] In some embodiments of the utility model, a second one-way valve 401 is provided between the thermostatic water tank 200 and the water pump 400. When the switching valve 300 is in the first connected state, the second one-way valve 401 can prevent the water in the water tank 100 from flowing back into the thermostatic water tank 200 during the process of flowing to the water outlet. This helps to maintain the temperature stability of the water in the thermostatic water tank 200 and ensure the water temperature separation between the water tank 100 and the thermostatic water tank 200, thereby ensuring that the water temperature setting selected by the user remains unchanged during use, especially in applications that require precise water temperature, such as brewing a specific type of tea or coffee. In addition, the water pump 400 may generate pressure fluctuations when extracting water from the water tank 100. The second one-way valve 401 provides a barrier to protect the thermostatic water tank 200 from such fluctuations and ensure stable water pressure.

[0059] like Figure 1 As shown, in some embodiments of the utility model, a water outlet box 500 is provided at the water outlet, and the water outlet box 500 can mix the water in the water tank 100 and the water in the thermostatic water tank 200. In this way, users do not need to wait for the water in the thermostatic water tank 200 to be adjusted to a completely consistent temperature. They can immediately obtain the mixed water of suitable temperature through the water outlet box 500, so that users can quickly obtain water of the temperature they want.

[0060] like Figure 1 As shown, in some embodiments of the present invention, the temperature regulating component 210 is at least one of a cooling unit and an auxiliary heating unit. For example, the temperature regulating component 210 can be a cooling unit, or the temperature regulating component 210 can be an auxiliary heating unit, or the temperature regulating component 210 can also be a combination of a cooling unit and an auxiliary heating unit. Among them, the cooling unit can be a fan 211 arranged on the side wall of the temperature regulating water tank 200, so as to cool the temperature regulating water tank 200. The auxiliary heating unit can be an auxiliary heating wire 212 arranged on the bottom wall of the temperature regulating water tank 200. For example, in the case of overheating, the fan 211 is first operated to reduce the water temperature. If the water temperature is too low, the auxiliary heating wire 212 can be enabled for auxiliary heating.

[0061] like Figure 1 As mentioned above, in some embodiments of the utility model, the water tank 100 is provided with a first temperature sensor 120, and the first temperature sensor 120 can detect the water temperature in the water tank 100. The temperature-adjusting water tank 200 is provided with a second temperature sensor 230, and the second temperature sensor 230 can detect the water temperature in the temperature-adjusting water tank 200. The water outlet box 500 is provided with a third temperature sensor 510, and the third temperature sensor 510 can detect the water temperature in the water outlet box 500.

[0062] In addition, in some other embodiments of the present invention, the liquid heating device further comprises a control display panel 600, which is electrically connected to the third temperature sensor 510 to display the water temperature of the water box 500. The control display panel 600 is also electrically connected to the switching valve 300, so that the user can control the switching of the switching valve 300 through the control display panel 600. For example, in the first connected state, the temperature of the first temperature sensor 120 is T1. At this time, when the water in the water tank 100 flows to the water outlet box 500, the temperature displayed by the third temperature sensor 510 is also T1, and water with a temperature of T1 can be directly discharged. In the second connected state, the water in the water tank 100 flows into the thermostatic water tank 200. After being temperature-adjusted by the thermostatic water tank 200, the temperature displayed by the second temperature sensor 230 is T2. At this time, the water in the thermostatic water tank 200 flows to the water outlet box 500. At this time, the temperature displayed by the third temperature sensor 510 is also T2, and water with a temperature of T2 can be directly discharged.

[0063] When the user needs to adjust the water temperature in the water outlet box 500 by himself, he can adjust the time ratio of the solenoid valve in position A and position B according to the temperature display on the control display panel 600, thereby adjusting the water output ratio of the thermostatic water tank 200 and the water tank 100, so that the water in the thermostatic water tank 200 and the water in the water tank 100 can be mixed in the water outlet box 500, thereby obtaining the water temperature desired by the user.

[0064] In one embodiment of the present invention, a water level monitoring unit (not shown) is provided in the thermostatic water tank 200. The water level monitoring unit can monitor the water level in the thermostatic water tank 200 in real time, and can keep the water level in the water tank within a specific range to avoid dry boiling or water overflow.

[0065] In some embodiments, the electric water heater is provided with an alarm device (not shown in the figure), and the water level monitoring device can be electrically connected to the alarm device. If the water level is too low, the water level monitoring unit can trigger an alarm signal and automatically shut down the electric heating component to prevent dry burning and reduce safety risks. The water level monitoring unit can also be used to optimize the heating efficiency of the system. For example, when the water level reaches an appropriate height, the thermostat component 210 is started to ensure the efficient use of energy. In combination with the control display panel 600, the water level can be displayed to the user, providing more information about the status of the liquid heating device and enhancing the user experience. In addition, the water level data can be recorded for system maintenance analysis, statistical water use habits, or as a guide for energy-saving and emission reduction measures.

[0066] The utility model also provides a liquid heating device (not shown in the figure), comprising a shell (not shown in the figure) and the above-mentioned liquid heating device, wherein the liquid heating device is arranged in the shell.

[0067] The liquid heating device provided by the utility model includes the above-mentioned liquid heating device and thus also has the beneficial effects of the above-mentioned liquid heating device, which will not be described in detail here.

[0068] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.

Claims

1. A liquid heating device, characterized in that: include: A water tank, wherein the water tank is provided with a main heating assembly; A temperature-adjusting water tank, wherein the temperature-adjusting water tank is provided with a temperature-adjusting component, and the volume of the temperature-adjusting water tank is smaller than the volume of the water tank; a switching valve, the switching valve switching between a first connection state and a second connection state, in which the switching valve conducts the water tank and the water outlet of the liquid heating device, and disconnects the water tank and the thermostatic water tank; in the second connection state, the switching valve disconnects the water tank and the water outlet, and the thermostatic water tank connects the water tank and the water outlet; A water pump, in the first connected state, the water pump connects the water tank and the water outlet; in the second connected state, the water pump connects the temperature-adjusting water tank and the water outlet.

2. The liquid heating device according to claim 1, characterized in that: A communicating vessel is formed between the temperature-adjusting water tank and the water tank, and the highest water level of the temperature-adjusting water tank is lower than the lowest water level of the water tank.

3. The liquid heating device according to claim 1, characterized in that: The temperature regulating water tank is provided with an atmosphere communicating pipeline, which connects the temperature regulating water tank with the outside world. A first one-way valve is provided on the atmosphere communicating pipeline, which conducts one-way along the temperature regulating water tank toward the outside world.

4. The liquid heating device according to claim 1, characterized in that: A second one-way valve is provided between the temperature-adjusting water tank and the water pump, and the second one-way valve is unidirectionally conducted along the temperature-adjusting water tank toward the water pump.

5. The liquid heating device according to claim 1, characterized in that: The water pump is a diaphragm pump.

6. The liquid heating device according to claim 1, characterized in that: A water outlet box is provided at the water outlet, and the water outlet box is suitable for mixing the water in the water tank and the temperature regulating water tank.

7. The liquid heating device according to claim 1, characterized in that: The temperature adjustment component includes at least one of a temperature reduction unit and an auxiliary heating unit. The cooling unit includes a fan arranged on the temperature regulating water tank.

8. The liquid heating device according to claim 6, characterized in that: The water tank is provided with a first temperature sensor, the temperature-adjusting water tank is provided with a second temperature sensor, and the water outlet box is provided with a third temperature sensor. and / or, The temperature regulating water tank is provided with a water level monitoring unit.

9. The liquid heating device according to claim 8, characterized in that The liquid heating device has a hot water outlet mode, a warm water outlet mode and a temperature adjustment mode. In the hot water outlet mode, the third temperature sensor displays the temperature of the first temperature sensor. In the warm water outlet mode, the third temperature sensor displays the temperature of the second temperature sensor; in the temperature adjustment mode, the temperature displayed by the third temperature sensor is adjustable, and the time ratio of the switching valve between the first connection state and the second connection state is adjusted so that the third temperature sensor can reach the desired temperature.

10. A liquid heating device, characterized in that: include: case; According to any one of claims 1 to 9, the liquid heating device is arranged in the shell.

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