Hot water equipment and operation method thereof

Abstract

The invention discloses hot water equipment and an operation method thereof. The hot water equipment comprises a sealing cavity; the heat exchange assembly is arranged in the sealing cavity; the water pipe structure is arranged in the sealing cavity, the heat exchange assembly is installed on the water pipe structure, one end of the water pipe structure is connected with a water supply pipeline outside the hot water equipment, and the other end of the water pipe structure is connected with a heat supply pipeline outside the hot water equipment; the temperature detection assembly is installed on the water pipe structure, and the temperature detection assembly is used for detecting the real-time temperature value T of the water pipe structure when the hot water equipment is in the standby state; and the hot air circulation assembly is installed in the sealing cavity, and when the real-time temperature value T is lower than the preset temperature, the hot air circulation assembly operates. According to the hot water equipment, the hot air circulation assembly is arranged in the sealing cavity, when the real-time temperature value T is lower than the preset temperature, the hot air circulation assembly operates to prevent the water pipe structure from being frozen, and the hot water equipment has the advantages of being simple in structure and good in reliability.

Description

Technical Field

[0001] The present invention relates to the technical field of household appliances, and in particular to a water heating device and an operating method thereof. Background Art

[0002] The existing gas heating furnace antifreeze protection generally uses the temperature probe inside the whole machine to detect the real-time water temperature in the pipeline. When the temperature is lower than the antifreeze start temperature set by the product, the water pump is started and the gas valve is opened. The water in the pipeline is heated by the combustion of gas, thereby achieving the antifreeze of the whole machine. This antifreeze method relies on the operation of the heating furnace itself. When some parts of the heating furnace itself fail, it is very easy to cause the antifreeze program to fail, which in turn causes the water in the pipeline to freeze and cause the pipeline to rupture.

[0003] Therefore, a hot water device is needed to solve the above problems. Summary of the invention

[0004] The present invention aims to solve at least one of the problems existing in the existing related technologies to a certain extent. To this end, the present invention proposes a hot water device. A hot air circulation component is arranged in a sealed cavity. When the real-time temperature value T is lower than the preset temperature, the hot air circulation component is operated to avoid ice formation in the water pipe structure and prevent the water pipe structure from being frozen. The antifreeze effect of the water pipe structure can be achieved without the help of the operation of the hot water device itself, avoiding the inability to achieve antifreeze protection when the hot water device itself fails. The device has the advantages of simple structure and good reliability.

[0005] The above purpose is achieved through the following technical solutions:

[0006] A hot water device, comprising:

[0007] Sealed cavity;

[0008] A heat exchange component is arranged in the sealed cavity;

[0009] A water pipe structure is arranged in the sealed cavity, the heat exchange assembly is installed on the water pipe structure, one end of the water pipe structure is connected to the water supply pipe outside the water heater, and the other end of the water pipe structure is connected to the heating pipe outside the water heater;

[0010] A temperature detection component is installed on the water pipe structure, and the temperature detection component is used to detect the real-time temperature value T of the water pipe structure when the hot water device is in a standby state;

[0011] A hot air circulation component is installed in the sealed cavity. When the real-time temperature value T is lower than a preset temperature, the hot air circulation component operates.

[0012] Optionally, the hot air circulation component includes a heating component and a fan connected to each other.

[0013] Optionally, the heating component includes a shell and a heating element, the shell is provided with an air duct, the shell is provided with a hot air outlet and an air inlet connected to the air duct, the heating element is arranged in the air duct, and the air outlet of the fan is connected to the air inlet.

[0014] Optionally, the heat exchange component includes a main heat exchanger and a domestic water heat exchanger, and the pipeline structure includes a heating heat exchange pipeline and a domestic water heat exchange pipeline, the main heat exchanger is installed on the heating heat exchange pipeline, and the domestic water heat exchanger is installed on the domestic water heat exchange pipeline, one end of the heating heat exchange pipeline is connected to the water outlet of the heating return water circuit, and the other end of the heating heat exchange pipeline is connected to the water inlet of the heating water outlet circuit, one end of the domestic water heat exchange pipeline is connected to the water supply pipeline outside the hot water equipment, and the other end of the domestic water heat exchange pipeline is connected to the water use point.

[0015] Optionally, it also includes a three-way valve, the heating heat exchange pipe includes a first heating heat exchange pipe and a second heating heat exchange pipe, one end of the first heating heat exchange pipe is connected to the water outlet of the heating return water circuit, the other end of the first heating heat exchange pipe is connected to the water inlet of the main heat exchanger, one end of the second heating heat exchange pipe is connected to the water outlet of the main heat exchanger, the other end of the second heating heat exchange pipe is connected to the water inlet of the heating water outlet, the domestic water heat exchange pipe includes a first domestic water heat exchange pipe and a second domestic water heat exchange pipe, the first domestic water heat exchange pipe One end of the tube is connected to the water supply pipe outside the hot water equipment, the other end of the first domestic water heat exchange tube is connected to the water inlet of the domestic water heat exchanger, one end of the second domestic water heat exchange tube is connected to the water outlet of the domestic water heat exchanger, the other end of the second domestic water heat exchange tube is connected to the water point, the first domestic water heat exchange tube is connected to the first heating heat exchange tube, the second domestic water heat exchange tube is connected to the second heating heat exchange tube, and the three-way valve is installed between the second domestic water heat exchange tube and the second heating heat exchange tube.

[0016] Optionally, the temperature detection component includes a first temperature detector and a second temperature detector, the first temperature detector is installed on the heating heat exchange pipe, and the first temperature detector is used to detect the real-time temperature T1 of the heating heat exchange pipe, and the second temperature detector is installed on the domestic water heat exchange pipe, and the second temperature detector is used to detect the real-time temperature T2 of the domestic water heat exchange pipe.

[0017] Optionally, a water pump is also included, and the water pump is installed on the water pipe structure.

[0018] Another aspect of the present invention provides a method for operating the water heater as described above, comprising the following steps:

[0019] S1: The hot water device is in standby mode;

[0020] S2: Detect the real-time temperature value T of the water pipe structure;

[0021] S3: Determine whether T≤T03, if so, go to S4, if not, return to S2;

[0022] S4: Enter the third level antifreeze protection program;

[0023] S5: The water pump and the hot air circulation component are both started;

[0024] S6: Determine whether T≥T07, if so, go to S7, if not, repeat S6;

[0025] S7: the water pump and the hot air circulation component both stop running, exit the third-level antifreeze protection program and return to S3;

[0026] Wherein, T03 is the first preset temperature, T07 is the second preset temperature, and T07>T03.

[0027] Optionally, S3 further includes the following steps:

[0028] S30: Determine whether T≤T04, if so, go to S31, if not, return to S2;

[0029] S31: Enter the fourth level antifreeze protection program;

[0030] S32: the hot air circulation component starts and issues an icing fault alarm;

[0031] S33: Determine whether T≤T08, if so, proceed to S34, if not, return to S32;

[0032] S34: the water pump is started;

[0033] S35: Determine whether T≥T09. If so, eliminate the icing fault alarm, exit the four-level antifreeze protection program and enter S2. If not, return to S34.

[0034] Wherein, T04 is the third preset temperature, T08 is the fourth preset temperature, T09 is the fifth preset temperature, T03>T09>T08>T04, and T04<1°C.

[0035] Optionally, S3 further includes the following steps:

[0036] S310: Determine whether T≤T02, if yes, proceed to S320, if no, return to S2;

[0037] S320: Enter the second level antifreeze protection program;

[0038] S330: the heat exchange component starts after the water pump starts for a first preset time t1;

[0039] S340: Determine whether T≥T06, if so, proceed to S350, if not, return to S320;

[0040] S350: the water pump stops running after a second preset time t2, exits the secondary antifreeze protection program and returns to S2;

[0041] Wherein, T02 is the sixth preset temperature, T06 is the seventh preset temperature, and T06>T02>T03.

[0042] Optionally, 100s≤t1≤150s, 20min≤t2≤40min.

[0043] Optionally, S3 further includes the following steps:

[0044] S300: Determine whether T≤T01, if so, go to S301, if not, return to S2;

[0045] S301: Entering the first level antifreeze protection program;

[0046] S302: the water pump is started;

[0047] S303: Determine whether T≥T05, if so, proceed to S304, if not, return to S302;

[0048] S304: the water pump stops running, the first-level antifreeze protection program is exited and the process returns to S2;

[0049] Wherein, T01 is the eighth preset temperature, T05 is the ninth preset temperature, and T05>T01>T02.

[0050] Optionally, the real-time temperature value T includes the real-time temperature T1 of the heating heat exchange pipe and / or the real-time temperature T2 of the domestic water heat exchange pipe.

[0051] Compared with the prior art, the present invention has at least the following beneficial effects:

[0052] The hot water equipment provided by the present invention includes a sealed cavity, a heat exchange component, a water pipe structure, a temperature detection component and a hot air circulation component. The heat exchange component is arranged in the sealed cavity. The water pipe structure is arranged in the sealed cavity, and the heat exchange component is installed on the water pipe structure. One end of the water pipe structure is connected to the water supply pipe outside the hot water equipment, and the other end of the water pipe structure is connected to the heating pipe outside the hot water equipment. The temperature detection component is installed on the water pipe structure, and the temperature detection component is used to detect the real-time temperature value T of the water pipe structure when the hot water equipment is in a standby state. The hot air circulation component is installed in the sealed cavity. When the real-time temperature value T is lower than the preset temperature, the hot air circulation component is operated to avoid the freezing of the water pipe structure and prevent the water pipe structure from being frozen. The antifreeze effect of the water pipe structure can be achieved without the help of the operation of the hot water equipment itself, so as to avoid the inability to achieve antifreeze protection when the hot water equipment itself fails. It has the advantages of simple structure and good reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] Figure 1 It is a structural schematic diagram of a water heater provided by a specific embodiment of the present invention;

[0054] Figure 2 It is a structural schematic diagram of a hot air circulation component of a water heater provided in a specific embodiment of the present invention;

[0055] Figure 3 It is an operation step diagram of a water heating device provided by a specific embodiment of the present invention.

[0056] In the figure:

[0057] 1. Sealed cavity;

[0058] 2. hot air circulation component; 21. fan; 22. heating component; 221. housing; 222. heating element;

[0059] 31. Main heat exchanger; 32. Domestic water heat exchanger;

[0060] 41. Heating heat exchange pipe; 411. First heating heat exchange pipe; 412. Second heating heat exchange pipe; 42. Domestic water heat exchange pipe; 421. First domestic water heat exchange pipe; 422. Second domestic water heat exchange pipe;

[0061] 51. a first temperature detector; 52. a second temperature detector;

[0062] 6. Water pump;

[0063] 7. Three-way valve. DETAILED DESCRIPTION

[0064] The following examples illustrate the present invention, but the present invention is not limited to these examples. Modifications to the specific embodiments of the present invention or equivalent replacement of some technical features without departing from the spirit of the present invention should be included in the scope of the technical solution claimed by the present invention.

[0065] Please refer to Figure 1 and Figure 2 The present invention provides a hot water device, including a sealed cavity 1, a heat exchange component, a water pipe structure, a temperature detection component and a hot air circulation component 2. The heat exchange component is arranged in the sealed cavity 1. The water pipe structure is arranged in the sealed cavity 1, and the heat exchange component is installed on the water pipe structure. One end of the water pipe structure is connected to the water supply pipe outside the hot water device, and the other end of the water pipe structure is connected to the heating pipe outside the hot water device. The temperature detection component is installed on the water pipe structure, and the temperature detection component is used to detect the real-time temperature value T of the water pipe structure when the hot water device is in a standby state. The hot air circulation component 2 is installed in the sealed cavity 1. When the real-time temperature value T is lower than the preset temperature, the hot air circulation component 2 is operated to avoid the freezing of the water pipe structure and prevent the water pipe structure from being frozen. The antifreeze effect of the water pipe structure can be achieved without the help of the operation of the hot water device itself, so as to avoid the inability to achieve antifreeze protection when the hot water device itself fails. It has the advantages of simple structure and good reliability.

[0066] Optionally, the hot air circulation component 2 includes a heating component 22 and a fan 21 that are interconnected. The heating component 22 heats the airflow flowing out of the fan 21 to achieve heating of the air in the sealed cavity 1, thereby preventing the water pipe structure located in the sealed cavity 1 from freezing.

[0067] Optionally, the heating component 22 includes a shell 221 and a heating element 222. An air duct is opened in the shell 221. A hot air outlet and an air inlet connected to the air duct are opened on the shell 221. The heating element 222 is arranged in the air duct, and the air outlet of the fan 21 is connected to the air inlet, so that the hot air just heated by the heating element 222 will not be blown directly into the fan 21, which is beneficial to the protection of the components of the fan 21.

[0068] Optionally, the heating element 222 is a PTC resistor or a resistance wire.

[0069] Optionally, the heat exchange component includes a main heat exchanger 31 and a domestic water heat exchanger 32, and the pipeline structure includes a heating heat exchange pipeline 41 and a domestic water heat exchange pipeline 42. The main heat exchanger 31 is installed on the heating heat exchange pipeline 41, and the domestic water heat exchanger 32 is installed on the domestic water heat exchange pipeline 42. One end of the heating heat exchange pipeline 41 is connected to the water outlet of the heating return water circuit, and the other end of the heating heat exchange pipeline 41 is connected to the water inlet of the heating water outlet circuit. One end of the domestic water heat exchange pipeline 42 is connected to the water supply pipeline outside the hot water equipment, and the other end of the domestic water heat exchange pipeline 42 is connected to the water use point, thereby realizing the heating of heating water and the heating of domestic water at the same time.

[0070] Optionally, it also includes a three-way valve 7, the heating heat exchange pipe 41 includes a first heating heat exchange pipe 411 and a second heating heat exchange pipe 412, one end of the first heating heat exchange pipe 411 is connected to the water outlet of the heating return water circuit, the other end of the first heating heat exchange pipe 411 is connected to the water inlet of the main heat exchanger 31, one end of the second heating heat exchange pipe 412 is connected to the water outlet of the main heat exchanger 31, and the other end of the second heating heat exchange pipe 412 is connected to the water inlet of the heating water outlet, the domestic water heat exchange pipe 42 includes a first domestic water heat exchange pipe 421 and a second domestic water heat exchange pipe 422, one end of the first domestic water heat exchange pipe 421 is connected to the water supply pipe outside the hot water equipment, the other end of the first domestic water heat exchange pipe 421 is connected to the water inlet of the domestic water heat exchanger 32, and one end of the second domestic water heat exchange pipe 422 is connected to the domestic water The water outlet of the heat exchanger 32 is connected, the other end of the second domestic water heat exchange pipe 422 is connected to the water point, the first domestic water heat exchange pipe 421 is connected to the first heating heat exchange pipe 411, the second domestic water heat exchange pipe 422 is connected to the second heating heat exchange pipe 412, and the three-way valve 7 is installed between the second domestic water heat exchange pipe 422 and the second heating heat exchange pipe 412. When domestic hot water is needed, the three-way valve 7 closes the connection between the second heating heat exchange pipe 412 and the heating water outlet, and the hot water in the second heating heat exchange pipe 412 can only flow through the domestic water heat exchanger 32, thereby realizing the heating of the cold water in the domestic water heat exchange pipe 42; when domestic hot water is not needed, the three-way valve 7 closes the connection between the second domestic water pipe heat pipe and the second heating heat exchange pipe 412, and the hot water in the second heating heat exchange pipe 412 can only flow out to the heating water outlet.

[0071] Optionally, the temperature detection component includes a first temperature detector 51 and a second temperature detector 52. The first temperature detector 51 is installed on the heating heat exchange pipe 41, and the first temperature detector 51 is used to detect the real-time temperature T1 of the heating heat exchange pipe 41. The second temperature detector 52 is installed on the domestic water heat exchange pipe 42, and the second temperature detector 52 is used to detect the real-time temperature T2 of the domestic water heat exchange pipe 42. By simultaneously detecting the real-time temperature T1 of the heating heat exchange pipe 41 and the real-time temperature T2 of the domestic water heat exchange pipe 42, freezing of either the heating heat exchange pipe 41 or the domestic water heat exchange pipe 42 can be avoided.

[0072] Optionally, a water pump 6 is also included. The water pump 6 is installed on the water pipe structure. When the heating device operates normally, the water pump 6 can be started to cooperate with the heat exchange component to achieve antifreeze of the pipeline structure.

[0073] Please refer to Figure 1-Figure 3 Another aspect of the present invention provides a method for operating the water heater as described above, comprising the following steps:

[0074] S1: The hot water device is in standby mode;

[0075] S2: Detect the real-time temperature value T of the water pipe structure;

[0076] S3: Determine whether T≤T03, if so, go to S4, if not, return to S2;

[0077] S4: Enter the third level antifreeze protection program;

[0078] S5: The water pump 6 and the hot air circulation component 2 are both started;

[0079] S6: Determine whether T≥T07, if so, go to S7, if not, repeat S6;

[0080] S7: The water pump 6 and the hot air circulation component 2 stop running, exit the third-level antifreeze protection program and return to S3;

[0081] Wherein, T03 is the first preset temperature, T07 is the second preset temperature, and T07>T03.

[0082] Optionally, S3 further includes the following steps:

[0083] S30: Determine whether T≤T04, if so, go to S31, if not, return to S2;

[0084] S31: Enter the fourth level antifreeze protection program;

[0085] S32: The hot air circulation component 2 starts and issues an icing fault alarm;

[0086] S33: Determine whether T≤T08, if so, proceed to S34, if not, return to S32;

[0087] S34: water pump 6 starts;

[0088] S35: Determine whether T≥T09. If so, eliminate the icing fault alarm, exit the fourth-level antifreeze protection program and enter S2. If not, return to S34.

[0089] Wherein, T04 is the third preset temperature, T08 is the fourth preset temperature, T09 is the fifth preset temperature, T03>T09>T08>T04, and T04<1°C.

[0090] Optionally, S3 further includes the following steps:

[0091] S310: Determine whether T≤T02, if yes, proceed to S320, if no, return to S2;

[0092] S320: Enter the second level antifreeze protection program;

[0093] S330: The heat exchange component starts after the water pump 6 starts for the first preset time t1;

[0094] S340: Determine whether T≥T06, if so, proceed to S350, if not, return to S320;

[0095] S350: the water pump 6 stops running after a second preset time t2, exits the secondary antifreeze protection program and returns to S2;

[0096] Wherein, T02 is the sixth preset temperature, T06 is the seventh preset temperature, and T06>T02>T03.

[0097] Optionally, 100s≤t1≤150s, 20min≤t2≤40min.

[0098] Optionally, in this embodiment, t1 is 120 seconds and t2 is 30 minutes.

[0099] Optionally, S3 further includes the following steps:

[0100] S300: Determine whether T≤T01, if so, go to S301, if not, return to S2;

[0101] S301: Entering the first level antifreeze protection program;

[0102] S302: water pump 6 starts;

[0103] S303: Determine whether T≥T05, if so, proceed to S304, if not, return to S302;

[0104] S304: the water pump 6 stops running, the first-level antifreeze protection program is exited and the process returns to S2;

[0105] Wherein, T01 is the eighth preset temperature, T05 is the ninth preset temperature, and T05>T01>T02.

[0106] Optionally, the real-time temperature value T includes the real-time temperature T1 of the heating heat exchange pipe 41 and / or the real-time temperature T2 of the domestic water heat exchange pipe 42 .

[0107] Specifically, when the hot water equipment is in standby mode, when T1 and T2 are both lower than T01, the first-level antifreeze protection program is first entered; when T1 and T2 continue to decrease to be lower than T02, the first-level antifreeze protection program becomes invalid, and the second-level antifreeze protection program is entered at this time; when T1 and T2 continue to decrease to be lower than T03, it indicates that the water pump 6 and / or the heat exchange component has failed, and the second-level antifreeze protection program becomes invalid, and the third-level antifreeze protection program is entered; when T1 and T2 continue to decrease to be lower than T04, it indicates that the hot air circulation component 2 has failed (completely stopped running or attenuated, resulting in power reduction), and the fourth-level antifreeze protection program is entered, and the hot air circulation component 2 is still instructed to work, so that when the hot air circulation component 2 is in an attenuated state, it can still maintain a certain operating power for operation, thereby avoiding or reducing the possibility of freezing of the pipeline structure, and achieving a better antifreeze effect.

[0108] Optionally, in this embodiment, T01 is 8°C, T02 is 5°C, T03 is 3°C, T04 is 1°C, T05 is 10°C, T06 is 25°C, T07 is 20°C, T08 is 1.1°C, and T09 is 3°C.

[0109] The above are only some embodiments of the present invention. For those skilled in the art, several modifications and improvements can be made without departing from the creative concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A hot water device, characterized in that: include: Sealed chamber (1); A heat exchange component, arranged in the sealed cavity (1); A water pipe structure is arranged in the sealed cavity (1), the heat exchange component is installed on the water pipe structure, one end of the water pipe structure is connected to the water supply pipe outside the water heater, and the other end of the water pipe structure is connected to the heating pipe outside the water heater; A temperature detection component is installed on the water pipe structure, and the temperature detection component is used to detect the real-time temperature value T of the water pipe structure when the hot water device is in a standby state; A hot air circulation component (2) is installed in the sealed chamber (1), and when the real-time temperature value T is lower than a preset temperature, the hot air circulation component (2) operates.

2. The water heating device according to claim 1, characterized in that: The hot air circulation component (2) comprises a heating component (22) and a fan (21) which are connected to each other.

3. The water heating device according to claim 2, characterized in that: The heating component (2) comprises an outer shell (221) and a heating element (222); an air duct is provided in the outer shell (221); a hot air outlet and an air inlet connected to the air duct are provided on the outer shell (221); the heating element (222) is arranged in the air duct; and an air outlet of the fan (21) is connected to the air inlet.

4. The water heating device according to claim 1, characterized in that: The heat exchange component comprises a main heat exchanger (31) and a domestic water heat exchanger (32); the pipeline structure comprises a heating heat exchange pipeline (41) and a domestic water heat exchange pipeline (42); the main heat exchanger (31) is installed on the heating heat exchange pipeline (41); the domestic water heat exchanger (32) is installed on the domestic water heat exchange pipeline (42); one end of the heating heat exchange pipeline (41) is connected to the water outlet of the heating return water circuit; the other end of the heating heat exchange pipeline (41) is connected to the water inlet of the heating water outlet circuit; one end of the domestic water heat exchange pipeline (42) is connected to the water supply pipeline outside the hot water equipment; and the other end of the domestic water heat exchange pipeline (42) is connected to a water use point.

5. The water heating device according to claim 4, characterized in that: The heating heat exchange pipe (41) further comprises a three-way valve (7); the heating heat exchange pipe (41) comprises a first heating heat exchange pipe (411) and a second heating heat exchange pipe (412); one end of the first heating heat exchange pipe (411) is connected to the water outlet of the heating return water circuit; the other end of the first heating heat exchange pipe (411) is connected to the water inlet of the main heat exchanger (31); one end of the second heating heat exchange pipe (412) is connected to the water outlet of the main heat exchanger (31); the other end of the second heating heat exchange pipe (412) is connected to the water inlet of the heating water outlet circuit; the domestic water heat exchange pipe (42) comprises a first domestic water heat exchange pipe (421) and a second domestic water heat exchange pipe (422); the first domestic water heat exchange pipe (421) is connected to the water outlet of the main heat exchanger (31); the second heating heat exchange pipe (422) is connected to the water inlet of the heating water outlet circuit; One end of the first domestic water heat exchange pipe (421) is connected to the water supply pipe outside the hot water equipment, the other end of the first domestic water heat exchange pipe (421) is connected to the water inlet of the domestic water heat exchanger (32), one end of the second domestic water heat exchange pipe (422) is connected to the water outlet of the domestic water heat exchanger (32), the other end of the second domestic water heat exchange pipe (422) is connected to the water use point, the first domestic water heat exchange pipe (421) is connected to the first heating heat exchange pipe (411), the second domestic water heat exchange pipe (421) is connected to the second heating heat exchange pipe (412), and the three-way valve (7) is installed between the second domestic water heat exchange pipe (421) and the second heating heat exchange pipe (412).

6. The water heating device according to claim 4, characterized in that: The temperature detection component comprises a first temperature detector (51) and a second temperature detector (52); the first temperature detector (51) is installed on the heating heat exchange pipe (41); the first temperature detector (51) is used to detect the real-time temperature T1 of the heating heat exchange pipe (41); the second temperature detector (52) is installed on the domestic water heat exchange pipe (42); the second temperature detector (52) is used to detect the real-time temperature T2 of the domestic water heat exchange pipe (42).

7. The water heating device according to any one of claims 1 to 6, characterized in that: It also comprises a water pump (6), wherein the water pump (6) is installed on the water pipe structure.

8. A method for operating a water heating device according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1: The hot water device is in standby mode; S2: Detect the real-time temperature value T of the water pipe structure; S3: Determine whether T≤T03, if so, go to S4, if not, return to S2; S4: Enter the third level antifreeze protection program; S5: the water pump (6) and the hot air circulation component (2) are both started; S6: Determine whether T≥T07, if so, go to S7, if not, repeat S6; S7: the water pump (6) and the hot air circulation component (2) both stop running, exit the third-level antifreeze protection program and return to S3; Wherein, T03 is the first preset temperature, T07 is the second preset temperature, and T07>T03.

9. The method for operating a water heater according to claim 8, characterized in that: S3 also includes the following steps: S30: Determine whether T≤T04, if so, go to S31, if not, return to S2; S31: Enter the fourth level antifreeze protection program; S32: the hot air circulation component (2) starts and issues an icing fault alarm; S33: Determine whether T≤T08, if so, proceed to S34, if not, return to S32; S34: the water pump (6) is started; S35: Determine whether T≥T09. If so, eliminate the icing fault alarm, exit the four-level antifreeze protection program and enter S2. If not, return to S34. Wherein, T04 is the third preset temperature, T08 is the fourth preset temperature, T09 is the fifth preset temperature, T03>T09>T08>T04, and T04<1°C.

10. The method for operating a water heater according to claim 9, characterized in that: The S3 further comprises the following steps: S310: Determine whether T≤T02, if yes, proceed to S320, if no, return to S2; S320: Enter the second level antifreeze protection program; S330: the heat exchange component starts after the water pump (6) starts for a first preset time t1; S340: Determine whether T≥T06, if so, proceed to S350, if not, return to S320; S350: the water pump (6) stops running after a second preset time t2, exits the secondary antifreeze protection program and returns to S2; Wherein, T02 is the sixth preset temperature, T06 is the seventh preset temperature, and T06>T02>T03.

11. The method for operating a water heater according to claim 10, characterized in that: 100s≤t1≤150s, 20min≤t2≤40min.

12. The method for operating a water heater according to claim 10, characterized in that: The S3 further comprises the following steps: S300: Determine whether T≤T01, if so, go to S301, if not, return to S2; S301: Entering the first level antifreeze protection program; S302: the water pump (6) is started; S303: Determine whether T≥T05, if so, proceed to S304, if not, return to S302; S304: the water pump (6) stops running, the first-level antifreeze protection program is exited and the process returns to S2; Wherein, T01 is the eighth preset temperature, T05 is the ninth preset temperature, and T05>T01>T02.

13. The method for operating a water heater according to any one of claims 8 to 12, characterized in that: The real-time temperature value T includes the real-time temperature T1 of the heating heat exchange pipe (41) and / or the real-time temperature T2 of the domestic water heat exchange pipe (42).

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