A heating device and its control method

Abstract

The present invention discloses a heating device and its control method. The heater of the device is arranged at the lower part of the housing; the first end of the water inlet pipe can be connected to an external water storage container, and the second end of the water inlet pipe is connected to the normally closed end of the first three-way solenoid valve; the water inlet of the transmission device is connected to the common end of the first three-way solenoid valve, and the water outlet of the transmission device is connected to the common end of the second three-way solenoid valve; the water absorption pipe is connected to the accommodation cavity and the normally open end of the first three-way solenoid valve; the first end of the water outlet pipe is connected to the normally closed end of the second three-way solenoid valve, and the second end of the water outlet pipe can be communicated with an external water receiving container; the water replenishing pipe is connected to the normally open end of the second three-way solenoid valve and the accommodation cavity. Thus, the functions of discharging cold water, discharging hot water and discharging steam can be realized by starting and stopping the first three-way solenoid valve, the transmission device and the second three-way solenoid valve. At the same time, the functions of evacuating the residual hot water in the accommodation cavity, cleaning the accommodation cavity and removing scale from the accommodation cavity can be realized.

Description

Technical Field

[0001] The present invention relates to the technical field of liquid heating, and in particular, to a heating device and a control method thereof. Background Art

[0002] Inside the bodies of water dispensers, tea-making machines, coffee machines, extractors, etc., there are heating devices, such as water heating devices. In traditional water heating devices, either water accumulates inside the heater and cannot be drained, or a screw cap is installed on the heater, and the sealing cap is unscrewed when it is necessary to drain the water to empty the water inside. Moreover, traditional water heating devices have a single function. They can only heat water or boil water through the heater, and release hot water by gravity or release steam through the steam density. It is necessary to swing the machine to release the water, which poses risks of being scalded and damaging the machine. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a heating device and a control method thereof for at least one defect existing in the prior art.

[0004] The technical solution adopted by the present invention to solve its technical problem is to construct a heating device including a water inlet pipe, a water suction pipe, a first three-way solenoid valve, a transmission device, a second three-way solenoid valve, a water outlet pipe, a water replenishing pipe, a housing having an accommodation cavity, and a heater;

[0005] The heater is provided at the lower part of the housing; the first end of the water inlet pipe can be connected to an external water storage container, and the second end of the water inlet pipe is connected to the normally closed end of the first three-way solenoid valve; the water inlet of the transmission device is connected to the common end of the first three-way solenoid valve, and the water outlet of the transmission device is connected to the common end of the second three-way solenoid valve; the water suction pipe is connected to the accommodation cavity and the normally open end of the first three-way solenoid valve; the first end of the water outlet pipe is connected to the normally closed end of the second three-way solenoid valve, and the second end of the water outlet pipe can be communicated with an external water receiving container; the water replenishing pipe is connected to the normally open end of the second three-way solenoid valve and the accommodation cavity.

[0006] Preferably, in the heating device of the present invention, the heating device further includes a steam outlet pipe, and the steam outlet pipe is connected to an external water receiving container and a steam outlet hole at the top of the accommodation cavity.

[0007] Preferably, in the heating device of the present invention, the heating device further includes an exhaust switch valve provided on the steam outlet pipe.

[0008] Preferably, in the heating device of the present invention, the heating device further includes a water suction pipe extending from the top of the accommodation cavity to the bottom inside the accommodation cavity, and the water suction pipe is connected to the water suction pipe.

[0009] Preferably, in the heating device of the present invention, the heating device further includes a filter member disposed at the bottom of the water suction pipe.

[0010] Preferably, in the heating device of the present invention, the heating device further includes an air inlet hole disposed at the top of the accommodation cavity and an air inlet switch valve disposed on the air inlet hole.

[0011] Preferably, in the heating device of the present invention, the heating device further includes a temperature sensor and a circuit board;

[0012] The temperature sensor is longitudinally long and vertically placed in the accommodation cavity, and the length of the temperature sensor is the set water level depth;

[0013] The circuit board is electrically connected to the heater and the temperature sensor, and the circuit board is used to detect the voltage difference between the heater and the temperature sensor to determine whether the water in the accommodation cavity reaches the set water level depth;

[0014] The circuit board is also electrically connected to the first three-way solenoid valve, the transmission device, and the second three-way solenoid valve.

[0015] Preferably, in the heating device of the present invention, the circuit board is electrically connected to the heater, the temperature sensor, the first three-way solenoid valve, the transmission device, and the second three-way solenoid valve through a flexible cable.

[0016] The present invention also constructs a control method for the heating device described in any one of the above, including:

[0017] Cold water output step: The water inlet pipe is connected to an external water storage container, the water outlet pipe communicates with an external water receiving container, and the first three-way solenoid valve, the second three-way solenoid valve, and the transmission device are controlled to be energized according to the received cold water output instruction, and the water in the external water storage container is transmitted to the external water receiving container through the water inlet pipe and the water outlet pipe;

[0018] Or, water replenishment step: The water pipe is connected to an external water storage container, and the first three-way solenoid valve and the transmission device are controlled to be energized according to the received water replenishment instruction, and the water in the external water storage container is transmitted to the accommodation cavity through the water inlet pipe and the water replenishment pipe;

[0019] Or, water pumping step: The second three-way solenoid valve and the transmission device are controlled to be energized according to the received water pumping instruction, and the air inlet switch valve at the top of the accommodation cavity is opened, and the water in the accommodation cavity is transmitted to the external water receiving container through the water suction pipe and the water outlet pipe;

[0020] Or, the step of heating to generate steam: Control the heater to turn on according to the received instruction for heating to generate steam, so as to heat the water in the accommodating cavity to generate steam, and open the exhaust switch valve on the steam outlet pipe, so that the steam is ejected through the steam outlet pipe.

[0021] The present invention also constructs a control method for the heating device described in any one of the above, including:

[0022] The step of discharging cold water: The water inlet pipe is connected to an external water storage container, the water outlet pipe communicates with an external water receiving container, and the circuit board controls the first three-way solenoid valve, the second three-way solenoid valve and the transmission device to be energized according to the received instruction for discharging cold water, and transmits the water in the external water storage container to the external water receiving container through the water inlet pipe and the water outlet pipe;

[0023] Or, the water replenishing step: The water pipe is connected to an external water storage container, and the circuit board controls the first three-way solenoid valve, the transmission device, the heater and the temperature sensor to be energized according to the received water replenishing instruction, and transmits the water in the external water storage container to the accommodating cavity through the water inlet pipe and the water replenishing pipe; and when the circuit board detects that the water in the accommodating cavity has reached the set water level depth, controls the first three-way solenoid valve and the transmission device to be powered off;

[0024] Or, the water pumping step: The circuit board controls the second three-way solenoid valve and the transmission device to be energized according to the received water pumping instruction, and opens the air inlet switch valve at the top of the accommodating cavity, and transmits the water in the accommodating cavity to the external water receiving container through the water absorption pipe and the water outlet pipe;

[0025] Or, the step of heating to generate steam: When the circuit board receives the instruction for heating to generate steam or detects that the water in the accommodating cavity has reached the set water level depth, controls the heater to turn on, so as to heat the water in the accommodating cavity to generate steam, and opens the exhaust switch valve on the steam outlet pipe, so that the steam is ejected through the steam outlet pipe.

[0026] By implementing the present invention, the following beneficial effects are achieved:

[0027] The present invention designs a heating device, which includes a water inlet pipe, a water suction pipe, a first three-way solenoid valve, a transmission device, a second three-way solenoid valve, a water outlet pipe, a water replenishing pipe, a housing with an accommodation cavity, and a heater. Specifically, the heater is arranged at the lower part of the housing; the first end of the water inlet pipe can be connected to an external water storage container, and the second end of the water inlet pipe is connected to the normally closed end of the first three-way solenoid valve; the water inlet of the transmission device is connected to the common end of the first three-way solenoid valve, and the water outlet of the transmission device is connected to the common end of the second three-way solenoid valve; the water suction pipe is connected to the accommodation cavity and the normally open end of the first three-way solenoid valve; the first end of the water outlet pipe is connected to the normally closed end of the second three-way solenoid valve, and the second end of the water outlet pipe can be communicated with an external water receiving container; the water replenishing pipe is connected to the normally open end of the second three-way solenoid valve and the accommodation cavity. Thus, the functions of discharging cold water, discharging hot water, and discharging steam can be achieved by starting and stopping the first three-way solenoid valve, the transmission device, and the second three-way solenoid valve. At the same time, the functions of evacuating the residual hot water in the accommodation cavity, cleaning the accommodation cavity, and removing scale from the accommodation cavity can be realized. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The present invention will be further described below in conjunction with the drawings and embodiments. In the drawings:

[0029] Figure 1 is the schematic diagram of the heating device of the present invention;

[0030] Figure 2 is the structural diagram of the heating device of the present invention;

[0031] Figure 3 is the structural explosion of the heating part of the heating device of the present invention Figure 1 ;

[0032] Figure 4 is the structural explosion of the heating part of the heating device of the present invention Figure 2 ;

[0033] Figure 5 is the schematic diagram of the electrical connection between the circuit board and the heater, temperature sensor, first three-way solenoid valve, transmission device, and second three-way solenoid valve in the heating device of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0034] In order to have a clearer understanding of the technical features, objectives, and effects of the present invention, the specific embodiments of the present invention will now be described in detail with reference to the drawings.

[0035] It should be noted that the flowcharts shown in the drawings are only illustrative and do not necessarily include all the contents and operations / steps, nor do they necessarily need to be executed in the described order. For example, some operations / steps can be decomposed, while some operations / steps can be combined or partially combined. Therefore, the actual execution order may change according to the actual situation.

[0036] The block diagrams shown in the drawings are only functional entities and do not necessarily correspond to physically independent entities. That is, these functional entities can be implemented in software form, or implemented in one or more hardware modules or integrated circuits, or implemented in different networks and / or processor devices and / or microcontroller devices.

[0037] As Figures 1-4 shown, this embodiment discloses a heating device, including a water inlet pipe 2, a water suction pipe 3, a first three-way solenoid valve 4, a transmission device 5, a second three-way solenoid valve 6, a water outlet pipe 7, a water replenishing pipe 8, a housing 12 having a receiving cavity, and a heater 13.

[0038] The heater 13 is provided at the lower part of the housing 12; the first end of the water inlet pipe 2 can be connected to an external water storage container 1, and the second end of the water inlet pipe 2 is connected to the normally closed end of the first three-way solenoid valve 4; the water inlet of the transmission device 5 is connected to the common end of the first three-way solenoid valve 4, and the water outlet of the transmission device 5 is connected to the common end of the second three-way solenoid valve 6; the water suction pipe 3 is connected to the receiving cavity and the normally open end of the first three-way solenoid valve 4; the first end of the water outlet pipe 7 is connected to the normally closed end of the second three-way solenoid valve 6, and the second end of the water outlet pipe 7 can be communicated with an external water receiving container 11; the water replenishing pipe 8 is connected to the normally open end of the second three-way solenoid valve 6 and the receiving cavity. For example, the transmission device 5 is a water pump, the external water storage container 1 is a water tank, and the external water receiving container 11 is a water cup.

[0039] In some embodiments, the heating device further includes a steam outlet pipe 9, and the steam outlet pipe 9 is connected to the external water receiving container 11 and the steam outlet hole 18 at the top of the receiving cavity. Preferably, in order to avoid steam backflow, the heating device further includes an exhaust switch valve 10 provided on the steam outlet pipe 9, such as a one-way valve or a solenoid valve, and the solenoid valve is opened when exhaust is required. Among them, a water spray head is provided at the first end of the water outlet pipe 7 connected to the external water receiving container 11, and a steam spray head is provided at one end of the steam outlet pipe 9 connected to the external water receiving container 11.

[0040] In some embodiments, in order to be able to pump out the water inside the receiving cavity completely and avoid the deterioration of the remaining water inside the heating device after use, which may contaminate the heating device, the heating device further includes a water suction pipe 23 extending from the top of the receiving cavity to the bottom inside the receiving cavity, and the water suction pipe 23 is connected to the water suction pipe 3. Preferably, in order to avoid the scale inside the receiving cavity from being pumped into the pipe and causing blockage, the heating device further includes a filter element 24 provided at the bottom of the water suction pipe 23.

[0041] Specifically, the heating device further includes a water replenishing hole 16, a water outlet hole 17, and a steam outlet hole 18 provided at the top of the accommodating cavity. The water replenishing pipe 8 is connected to the water replenishing hole 16, the water absorption pipe 3 and the water suction pipe 23 are respectively connected to the water outlet hole 17, and the steam outlet pipe 9 is connected to the steam outlet hole 18.

[0042] In some embodiments, in order to avoid excessive negative pressure when draining the water in the device and being unable to drain the water, the heating device further includes an air inlet hole 19 provided at the top of the accommodating cavity and an air inlet switch valve 20 provided on the air inlet hole 19, such as a one-way valve or a solenoid valve, and the solenoid valve is opened when air intake is required.

[0043] In some embodiments, as Figure 3 and 5 shown, the heating device further includes a temperature sensor 15 and a circuit board 14. The temperature sensor 15 is longitudinally long and vertically placed in the accommodating cavity, and the length of the temperature sensor 15 is the set water level depth; the circuit board 14 is electrically connected to the heater 13 and the temperature sensor 15, and the circuit board 14 is used to detect the voltage difference between the heater 13 and the temperature sensor 15 to determine whether the water in the accommodating cavity reaches the set water level depth. The circuit board 14 is also electrically connected to the first three-way solenoid valve 4, the transmission device 5, and the second three-way solenoid valve 6 to supply power to the first three-way solenoid valve 4, the transmission device 5, and the second three-way solenoid valve 6. For example, the circuit board is a power supply PCB board.

[0044] This embodiment is designed based on the different resistivities of water and gas, uses electrodes to judge the height of the water level, simplifies the water level detection structure, and reduces costs.

[0045] When the voltage difference between the two ends of the heater 13 and the temperature sensor 15 is greater than the preset threshold, it means the water is not full; when the voltage at both ends is less than the preset threshold, it means the water is full. Among them, the maximum voltage difference at both ends is the input power supply voltage. For example, the preset threshold is 4V and the maximum voltage difference is 5V.

[0046] In some embodiments, the circuit board 14 is electrically connected to the heater 13, the temperature sensor 15, the first three-way solenoid valve 4, the transmission device 5, and the second three-way solenoid valve 6 through a 2PIN cable. For example, a 2PIN cable, and the 2PIN cable is only an example. In other embodiments, other connection methods may also be used.

[0047] In some embodiments, the temperature sensor 15 includes a conductive housing 151, such as a metal housing, and the circuit board 14 is electrically connected to the conductive housing 151 of the temperature sensor 15.

[0048] In some embodiments, the housing 12 includes a conductive base 121 and an insulating top cover 122, such as a metal base. The heater 13 is disposed below the conductive base 121, the temperature sensor 15 is passed through the insulating top cover 122, and the water replenishing hole 16, the water outlet hole 17, the steam outlet hole 18 and the air inlet hole 19 are all provided on the insulating top cover 122. Further, the circuit board 14 is electrically connected to the heater 13 through the conductive base 121.

[0049] And correspondingly, a first polar terminal 152 electrically connected to the circuit board 14, such as a positive terminal, is provided on the conductive housing 151. A second polar terminal 131 electrically connected to the circuit board 14, such as a negative terminal, is provided on the conductive base 121.

[0050] In some embodiments, in order to ensure the sealing performance, a first seal 21, such as an O-ring, is provided between the base 121 and the insulating top cover 122. A second seal 22, such as a sealing sleeve, is provided between the temperature sensor 15 and the insulating top cover 122.

[0051] Based on any of the above embodiments of the heating device, this embodiment also discloses a control method for a heating device, including:

[0052] Cold water discharging step: The water inlet pipe 2 is connected to the external water storage container 1, and the water outlet pipe 7 communicates with the external water receiving container 11. According to the received cold water discharging instruction, the first three-way solenoid valve 4, the second three-way solenoid valve 6 and the transmission device 5 are controlled to be energized, and the water in the external water storage container 1 is transmitted to the external water receiving container 11 through the water inlet pipe 2 and the water outlet pipe 7. And when the amount of cold water discharged is sufficient, the first three-way solenoid valve 4, the second three-way solenoid valve 6 and the transmission device 5 can be controlled to be de-energized according to the received stop instruction.

[0053] Or, water replenishing step: The water pipe is connected to the external water storage container 1. According to the received water replenishing instruction, the first three-way solenoid valve 4 and the transmission device 5 are controlled to be energized, and the water in the external water storage container 1 is transmitted to the accommodation cavity through the water inlet pipe 2 and the water replenishing pipe 8. In some embodiments, the amount of water replenished can be controlled according to the received water replenishing instruction and the preset water replenishing time, or according to the received water replenishing instruction including the amount of water replenished.

[0054] Or, the water pumping step: Control the second three-way solenoid valve 6 and the transmission device 5 to be powered on according to the received water pumping instruction, and transfer the water in the accommodating cavity to the external water storage container 11 through the water absorption pipe 3 and the water outlet pipe 7. Meanwhile, the air intake switch valve 20 is automatically opened. And when the water pumping volume is sufficient, the second three-way solenoid valve 6 and the transmission device 5 can be controlled to be powered off according to the received stop instruction, and the air intake switch valve 20 is automatically closed. Moreover, the on / off of the heater 13 can be controlled according to the temperature value sent by the temperature sensor 15 to reach the set temperature of the pumped-out water. Among them, the water in the accommodating cavity can be the hot water heated by the heater 13. By pumping out the hot water in the accommodating cavity, the water remaining in the accommodating cavity after the heater 13 is used can be prevented from deteriorating and polluting the heating device. The water in the accommodating cavity can also be clean water. The clean water in the water storage container can be added to the accommodating cavity multiple times through the water replenishing step, and then the clean water in the accommodating cavity can be pumped out through the water pumping step, so as to realize the function of cleaning the accommodating cavity. Softening agents or scale-removing liquids can also be added to the water storage container to remove the scale in the accommodating cavity, so as to realize the scale-removing function of the accommodating cavity.

[0055] Or, the heating and steam output step: Control the heater 13 to be turned on according to the received heating and steam output instruction to heat the water in the accommodating cavity. After the water boils, the exhaust switch valve 10 is automatically opened, and the steam is ejected through the steam outlet pipe 9. And the heater 13 is controlled to be turned off according to the preset steam output time or instructions in other ways.

[0056] Based on any of the above heating device embodiments, the present embodiment also discloses a control method for a heating device, including:

[0057] The cold water output step: The water inlet pipe 2 is connected to the external water storage container 1, and the water outlet pipe 7 communicates with the external water storage container 11. The circuit board 14 controls the first three-way solenoid valve 4, the second three-way solenoid valve 6, and the transmission device 5 to be powered on according to the received cold water output instruction, and transfers the water in the external water storage container 1 to the external water storage container 11 through the water inlet pipe 2 and the water outlet pipe 7. And when the cold water output volume is sufficient, the circuit board 14 can control the first three-way solenoid valve 4, the second three-way solenoid valve 6, and the transmission device 5 to be powered off according to the received stop instruction.

[0058] Or, the water replenishing step: The water pipe is connected to the external water storage container 1. The circuit board 14 controls the first three-way solenoid valve 4, the transmission device 5, the heater 13, and the temperature sensor 15 to be powered on according to the received water replenishing instruction, and transfers the water in the external water storage container 1 to the accommodating cavity through the water inlet pipe 2 and the water replenishing pipe 8. And when the circuit board 14 detects that the water in the accommodating cavity has reached the set water level depth, it controls the first three-way solenoid valve 4 and the transmission device 5 to be powered off.

[0059] Or, the water pumping step: The circuit board 14 controls the second three-way solenoid valve 6 and the transmission device 5 to be powered on according to the received water pumping instruction, and transmits the water in the accommodating cavity to the external water container 11 through the water absorption pipe 3 and the water outlet pipe 7. At the same time, the air intake switch valve 20 is automatically opened. And when the amount of pumped water is sufficient, the circuit board 14 can control the second three-way solenoid valve 6 and the transmission device 5 to be powered off according to the received stop instruction, and at the same time, the air intake switch valve 20 is automatically closed. Moreover, the on / off of the heater 13 can be controlled according to the temperature value sent by the temperature sensor 15 to reach the set temperature of the pumped-out water. Among them, the water in the accommodating cavity can be the hot water heated by the heater 13. By pumping out the hot water in the accommodating cavity, it is avoided that the water remaining in the accommodating cavity after the use of the heater 13 deteriorates and pollutes the heating device. The water in the accommodating cavity can also be clean water. The clean water in the water storage container is added to the accommodating cavity multiple times through the water replenishing step, and then the clean water in the accommodating cavity is pumped out through the water pumping step, so that the function of cleaning the accommodating cavity can be realized. Softening agents or liquids for removing water scale can also be added to the water storage container to remove the water scale in the accommodating cavity, so as to realize the function of removing scale in the accommodating cavity.

[0060] Or, the heating and steam output step: When the circuit board 14 receives the heating and steam output instruction or detects that the water in the accommodating cavity has reached the set water level depth, it controls the heater 13 to turn on to heat the water in the accommodating cavity. After the water boils, the exhaust switch valve 10 is automatically opened, and the steam is ejected through the steam output pipe 9. And according to the preset steam output time or instructions in other ways, the heater 13 is controlled to turn off.

[0061] It should be noted that the above cold water output instruction, stop instruction, water replenishing instruction, water pumping instruction and heating and steam output instruction are all instructions input by the user through voice input or on the touch panel or on the keys.

[0062] By implementing the present invention, the following beneficial effects are achieved:

[0063] The present invention designs a heating device, which includes a water inlet pipe, a water absorption pipe, a first three-way solenoid valve, a transmission device, a second three-way solenoid valve, a water outlet pipe, a water replenishing pipe, a housing with a receiving cavity, and a heater. Specifically, the heater is arranged at the lower part of the housing; the first end of the water inlet pipe can be connected to an external water storage container, and the second end of the water inlet pipe is connected to the normally closed end of the first three-way solenoid valve; the water inlet of the transmission device is connected to the common end of the first three-way solenoid valve, and the water outlet of the transmission device is connected to the common end of the second three-way solenoid valve; the water absorption pipe is connected to the receiving cavity and the normally open end of the first three-way solenoid valve; the first end of the water outlet pipe is connected to the normally closed end of the second three-way solenoid valve, and the second end of the water outlet pipe can be communicated with an external water receiving container; the water replenishing pipe is connected to the normally open end of the second three-way solenoid valve and the receiving cavity. Thus, the functions of discharging cold water, discharging hot water, and discharging steam can be realized by starting and stopping the first three-way solenoid valve, the transmission device, and the second three-way solenoid valve. At the same time, the functions of evacuating the residual hot water in the receiving cavity, cleaning the receiving cavity, and removing scale from the receiving cavity can be realized.

[0064] It can be understood that the above embodiments only express the preferred embodiments of the present invention, and the description thereof is relatively specific and detailed, but it cannot be construed as a limitation on the scope of the invention patent; it should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, the above technical features can be freely combined, and several deformations and improvements can also be made, which all belong to the protection scope of the present invention; therefore, all equivalent transformations and modifications made to the scope of the claims of the present invention shall fall within the scope covered by the claims of the present invention.

Claims

1. A heating device, characterized in that, It includes a water inlet pipe (2), a water suction pipe (3), a first three-way solenoid valve (4), a transmission device (5), a second three-way solenoid valve (6), a water outlet pipe (7), a water replenishing pipe (8), a housing (12) with a receiving cavity, a heater (13), a circuit board (14), a temperature sensor (15), and a water suction tube (23); The heater (13) is arranged at the lower part of the housing (12); the first end of the water inlet pipe (2) can be connected to an external water storage container (1), and the second end of the water inlet pipe (2) is connected to the normally closed end of the first three-way solenoid valve (4); the water inlet of the transmission device (5) is connected to the common end of the first three-way solenoid valve (4), and the water outlet of the transmission device (5) is connected to the common end of the second three-way solenoid valve (6); the water suction pipe (3) is connected to the receiving cavity and the normally open end of the first three-way solenoid valve (4); the water suction tube (23) extends from the inner bottom of the receiving cavity to the top of the receiving cavity and is connected to the water suction pipe (3); the first end of the water outlet pipe (7) is connected to the normally closed end of the second three-way solenoid valve (6), and the second end of the water outlet pipe (7) can be communicated with an external water receiving container (11); the water replenishing pipe (8) is connected to the normally open end of the second three-way solenoid valve (6) and the receiving cavity; The temperature sensor (15) is longitudinally long and vertically placed in the receiving cavity, and the length of the temperature sensor (15) is the set water level depth; the circuit board (14) is electrically connected to the heater (13) and the temperature sensor (15), and the circuit board (14) is used to detect the voltage difference between the heater (13) and the temperature sensor (15) to determine whether the water in the receiving cavity reaches the set water level depth; the circuit board (14) is also electrically connected to the first three-way solenoid valve (4), the transmission device (5), and the second three-way solenoid valve (6).

2. The heating device according to claim 1, characterized in that, The heating device further includes a steam outlet pipe (9), and the steam outlet pipe (9) is connected to an external water receiving container (11) and a steam outlet hole (18) at the top of the receiving cavity.

3. The heating device according to claim 2, characterized in that, The heating device further includes an exhaust switch valve (10) arranged on the steam outlet pipe (9).

4. The heating device according to claim 1, characterized in that, The heating device further includes a filter element (24) arranged at the bottom of the water suction tube (23).

5. The heating device according to claim 1, characterized in that, The heating device further includes an air inlet hole (19) arranged at the top of the receiving cavity and an air inlet switch valve (20) arranged on the air inlet hole (19).

6. The heating device according to claim 1, characterized in that, The circuit board (14) is electrically connected to the heater (13), the temperature sensor (15), the first three-way solenoid valve (4), the transmission device (5), and the second three-way solenoid valve (6) through a cable.

7. A control method for the heating device according to any one of claims 2-5, characterized in that Comprising: Cold water output step: The water inlet pipe (2) is connected to an external water storage container (1), and the water outlet pipe (7) communicates with an external water receiving container (11). According to the received cold water output instruction, the first three-way solenoid valve (4), the second three-way solenoid valve (6) and the transmission device (5) are controlled to be energized, and the water in the external water storage container (1) is transmitted to the external water receiving container (11) through the water inlet pipe (2) and the water outlet pipe (7). Or, water replenishment step: The water pipe is connected to an external water storage container (1). According to the received water replenishment instruction, the first three-way solenoid valve (4) and the transmission device (5) are controlled to be energized, and the water in the external water storage container (1) is transmitted to the accommodation cavity through the water inlet pipe (2) and the water replenishment pipe (8). Or, water pumping step: According to the received water pumping instruction, the second three-way solenoid valve (6) and the transmission device (5) are controlled to be energized, and the air inlet switch valve (20) at the top of the accommodation cavity is opened, and the water in the accommodation cavity is transmitted to the external water receiving container (11) through the water suction pipe (3) and the water outlet pipe (7). Or, heating and steam output step: According to the received heating and steam output instruction, the heater (13) is controlled to be turned on to heat the water in the accommodation cavity to generate steam, and the exhaust switch valve (10) on the steam output pipe (9) is opened to allow the steam to be ejected through the steam output pipe (9).

8. A control method for the heating device according to claim 1 or 6, characterized in that Including: Cold water output step: The water inlet pipe (2) is connected to an external water storage container (1), and the water outlet pipe (7) communicates with an external water receiving container (11). The circuit board (14) controls the first three-way solenoid valve (4), the second three-way solenoid valve (6) and the transmission device (5) to be energized according to the received cold water output instruction, and the water in the external water storage container (1) is transmitted to the external water receiving container (11) through the water inlet pipe (2) and the water outlet pipe (7). Or, water replenishment step: The water pipe is connected to an external water storage container (1). The circuit board (14) controls the first three-way solenoid valve (4), the transmission device (5), the heater (13) and the temperature sensor (15) to be energized according to the received water replenishment instruction, and the water in the external water storage container (1) is transmitted to the accommodation cavity through the water inlet pipe (2) and the water replenishment pipe (8). And when the circuit board (14) detects that the water in the accommodation cavity has reached the set water level depth, it controls the first three-way solenoid valve (4) and the transmission device (5) to be de-energized. Or, water pumping step: The circuit board (14) controls the second three-way solenoid valve (6) and the transmission device (5) to be energized according to the received water pumping instruction, and the air inlet switch valve (20) at the top of the accommodation cavity is opened, and the water in the accommodation cavity is transmitted to the external water receiving container (11) through the water suction pipe (3) and the water outlet pipe (7). Or, the step of heating to generate steam: When the circuit board (14) receives a heating-to-generate-steam instruction or detects that the water in the accommodating cavity has reached a set water level depth, it controls the heater (13) to turn on to heat the water in the accommodating cavity to generate steam, and the exhaust switch valve (10) on the steam outlet pipe (9) is opened so that the steam is ejected through the steam outlet pipe (9).

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