Gas water heater heating control method and gas water heater

Abstract

A gas water heater heating control method and a gas water heater, belonging to the technical field of household appliance control methods. When in standby mode, the main controller makes a judgment, when T A >T0, the main controller does not make a decision; when T A When T0 is less than the time, the main controller controls the electric auxiliary heating device to heat; repeats at a fixed time interval; when in working state, it includes the following steps: the main controller makes a judgment, when T A >T0, the main controller does not make a decision; when T A When <T0, the main controller controls the electric auxiliary heating device to heat; the water temperature T at the temperature sensor A is obtained again A , the main controller makes a judgment; sets a positive number △T to obtain the water temperature T at the temperature sensor B B , the main controller makes judgment and operates until T B The absolute value of ‑T0 ≤ △T; repeat the above steps. This control method is particularly suitable for gas water heaters with electric auxiliary heating devices.

Description

Technical Field

[0001] The present invention belongs to the technical field of household appliance control methods, and in particular relates to a gas water heater heating control method and a gas water heater. Background Art

[0002] A gas water heater is a type of gas water heater that uses gas as fuel and transfers heat to cold water flowing through a heat exchanger through combustion heating to achieve the purpose of preparing hot water. For a gas water heater that uses a fan to extract air, the fan assembly has the function of guiding the high-temperature flue gas generated by combustion to flow through the heat exchanger, flow to the smoke hood and be discharged, and on the other hand, provide sufficient oxygen for combustion; in this type of structure, the gas still has heat utilization value after flowing through the heat exchanger and before entering the fan, and a preheating device can be set.

[0003] In the prior art, there is no technology for heating control method of such device. Summary of the invention

[0004] In order to solve the above technical problems, the present application further improves the heating control method, so as to improve the drainage balance and further improve the heat exchange efficiency through the control method. One of the purposes of the present invention is to provide a gas water heater heating control method, and the second purpose is to provide a corresponding gas water heater.

[0005] The specific technical solution is described below:

[0006] A gas water heater heating control method:

[0007] When in standby mode, the following steps are included:

[0008] (S.1): Get the water temperature T at the temperature sensor A A , the user sets the temperature T0, the main controller makes a judgment, when T A >T0, the main controller does not make a decision; when T A When <T0, the main controller controls the electric auxiliary heating device to heat for a fixed time t A1 ;

[0009] (S.2): Every fixed time t A2 Repeat step (S.1), t A2 Greater than t A1 ;

[0010] When in working state, it includes the following steps:

[0011] (S.1'): Get the water temperature T at the temperature sensor A A , the user sets the temperature T0, the main controller makes a judgment, when T A>T0, the main controller does not make a decision; when T A When <T0, the main controller controls the electric auxiliary heating device to heat for a fixed time t A3 ;

[0012] (S.2'): Get the water temperature T at the temperature sensor A again A , the main controller makes a judgment, when T A >T0, the main controller does not make a decision and the burner does not work; when T A When <T0, the main controller controls the burner to heat at a certain intensity for a fixed time;

[0013] (S.3'): Set a positive number △T to obtain the water temperature T at the temperature sensor B B , the main controller makes a judgment, when T B When the absolute value of -T0 is ≤△T, the main controller does not make a decision;

[0014] When T B When -T0<-△T, increase the heating intensity of the burner for a fixed time and obtain the water temperature T again. B , if T B -T0<-△T, then continue to increase the heating intensity of the burner for a fixed time, and repeat this cycle until T B -The absolute value of T0 ≤ △T;

[0015] When T B - When T0>△T, reduce the heating intensity of the burner and heat for a fixed time to obtain the water temperature T again B , if T B -T0>△T, then continue to reduce the heating intensity of the burner and heat for a fixed time, and repeat this cycle until T B -The absolute value of T0 ≤ △T;

[0016] (S.4'): Repeat steps (S.1') to (S.3').

[0017] In the above technical solution, temperature sensor A corresponds to the position where water flows into the electric auxiliary heating device, and detects the temperature of water before it flows into the electric auxiliary heating device. Temperature sensor B corresponds to the position where hot water finally flows out, and detects the final temperature of the hot water flowing out.

[0018] Preferably, in steps (S.1) and (S.1'), the main controller calculates P 电 = Q × 4.18 × (T0-T A ), where Q is the flow rate of hot water.

[0019] Further preferably, in steps (S.1) and (S.1'), the main controller calculates the P 电Compared with the maximum power Pmax that the electric auxiliary heating device can achieve, when P 电 <P 最大 When the electric auxiliary heating device is in accordance with P 电 Output, when P 电 ≥P 最大 When the electric auxiliary heating device is in accordance with P 最大 Output.

[0020] Preferably, in step (S.2'), the heating intensity of the burner is equivalent to the power P1, P1 = Q × 4.18 × (T0-T A ), where Q is the flow rate of hot water.

[0021] Further preferably, in step (S.3'), ΔT=0.5.

[0022] The gas water heater controlled by the control method described in any of the above technical solutions comprises a spoiler, a fan, a heat exchanger and a burner, wherein the fan is arranged above the spoiler, the heat exchanger is arranged below the spoiler, and the burner is arranged below the heat exchanger;

[0023] The spoiler includes a plurality of through flue gas holes and a heat exchange channel arranged in the shell of the spoiler, the heat exchange channel is connected to the water flow channel of the heat exchanger, and the spoiler also includes an electric auxiliary heating device arranged in the heat exchange channel for heating.

[0024] In the above technical solution, by setting up a heat exchange flow channel, the heat exchange efficiency is improved while retaining the drainage balance function, and an electric auxiliary heating device is introduced to achieve rapid heating and reduce user waiting time.

[0025] Preferably, the spoiler also has a step portion that sinks toward the heat exchanger, and a smoke collection channel is arranged between the air intake of the fan and the smoke outlet of the heat exchanger, and the smoke collection channel includes a first flow area located below the fan and a second flow area located in other parts, and the first flow area has a resistance reduction opening that is not covered by the spoiler.

[0026] In the above technical solution, compared with a flat-plate spoiler of the same length, the sunken step portion can extend the flow distance and flow time of water in the heat exchange flow channel and increase the contact area between the spoiler and the flue gas, thereby obtaining a more sufficient heat exchange effect; the sunken step portion can also prevent the spoiler and the fan position from interfering with each other in the limited internal space of the water heater, thereby facilitating the arrangement of the spoiler; after the flue gas passes through the heat exchanger, the temperature is still around 100~200℃. By exchanging heat in the spoiler and absorbing the waste heat of this part of the flue gas, the water is preheated.

[0027] Preferably, the step portion partially extends to the bottom of the fan to extend the length of the spoiler as much as possible, increase the heat exchange area and the distance and duration of fluid flow, and improve the heat exchange efficiency.

[0028] Preferably, a guide slope is formed at the initial position where the step portion sinks, and the guide slope guides the smoke to flow upward. Due to the existence of the bottom surface of the fan, the smoke is in a horizontal flow state after flowing out through the bottom of the fan. The horizontal flow direction will interfere with the smoke flowing out of the spoiler upward, which is not conducive to the smoke passing through the spoiler. Therefore, a guide slope is provided, and the smoke first flows through the guide slope after flowing out through the bottom of the fan, thereby changing its flow direction, avoiding its interference with the smoke flowing out of the spoiler upward, and reducing the smoke flow resistance.

[0029] Further preferably, an induced opening is formed between the guide slope and the smoke outlet side of the fan. At this time, the induced opening is formed by the gap between the guide slope and the smoke outlet side of the fan. The guide slope guides the smoke upward, and the formed induced airflow can guide the smoke to flow into the fan.

[0030] Preferably, the electric auxiliary heating device includes a heating pipe arranged in the shell of the spoiler and a heating joint arranged outside the spoiler. Further preferably, the heating pipe is spiraled between a plurality of groups of smoke through holes to form a circuitous heating structure, so as to further increase the heating area and the contact area with water, heat quickly, and further reduce the waiting time of users.

[0031] Preferably, the heat exchange channel is provided with a water inlet and a water outlet, respectively, the water inlet and the water outlet are located on the same side of the spoiler, and form a circuitous heat exchange channel. Further preferably, the heating joint, the water inlet and the water outlet are arranged on the same side of the spoiler, and the heating joint is located between the water inlet and the water outlet.

[0032] In summary, the technical solution of the present invention has the following main beneficial effects:

[0033] Compared with the prior art, the technical solution of the present invention can improve the heat exchange efficiency on the basis of the spoiler realizing the drainage balance function, and the electric auxiliary heating device can reduce the user's waiting time, thereby improving the user's experience.

[0034] Further or more detailed beneficial effects will be described in detail in conjunction with specific examples in the specific implementation manner. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 is a workflow logic diagram in the standby state in the control method described in the embodiment;

[0036] Figure 2It is a workflow logic diagram in the working state of the control method described in the embodiment;

[0037] Figure 3 Schematic diagram of the internal structure of the gas water heater with the heat exchange turbulence structure described in the embodiment;

[0038] Figure 4 is a schematic diagram of the three-dimensional structure of the spoiler described in the embodiment;

[0039] Figure 5 It is a schematic diagram of the internal structure of the spoiler described in the embodiment.

[0040] Reference numerals:

[0041] 1: spoiler, 1.1: flue gas channel, 1.2: heat exchange channel, 1.3: water inlet, 1.4: water outlet, 1.5: electric auxiliary heating device, 1.51: heating pipe, 1.52: heating joint, 1.6: step part, 1.61: guide slope;

[0042] 2: fan, 3: heat exchanger, 4: smoke collecting wall, 5: burner;

[0043] a: smoke collection channel, a.1: first circulation area, a.11: resistance reduction opening, a.12: injection opening, a.2: second circulation area. DETAILED DESCRIPTION

[0044] The present invention is further explained with reference to the following embodiments:

[0045] The core technical problem faced by the technical solution of the embodiment of the present application comes from the inventor's accurate understanding of the prior art. Therefore, how to further reduce the user's waiting time and improve the user's experience on the basis of realizing the drainage balance function of the spoiler is a technical problem that the inventor urgently needs to solve.

[0046] It should be noted that the embodiments do not constitute a limitation on the protection scope of the claims of the present invention. According to the technical concepts provided / proven by the embodiments, all technical solutions that can be reasonably anticipated by technicians in the relevant technical field should be included in the protection scope of the claims of the present invention.

[0047] The embodiments are described in detail as follows:

[0048] Please refer to Figure 1 and Figure 2 , a gas water heater heating control method:

[0049] When in standby mode, the following steps are included:

[0050] (S.1): Get the water temperature T at the temperature sensor A A, the user sets the temperature T0, the temperature sensor A corresponds to the position where the water flows into the electric auxiliary heating device, and detects the temperature before the water flows into the electric auxiliary heating device. The main controller makes a judgment. When T A >T0, the main controller does not make a decision; when T A When <T0, the main controller controls the electric auxiliary heating device 1.5 to heat for a fixed time t A1 ; The main controller calculates P 电 = Q × 4.18 × (T0-T A ), where Q is the flow rate of hot water, the main controller calculates P 电 The maximum power P that can be achieved with the electric auxiliary heating device 1.5 最大 For comparison, when P 电 <P 最大 When the electric auxiliary heating device is 1.5, it is in accordance with P 电 Output, when P 电 ≥P 最大 When the electric auxiliary heating device is 1.5, it is in accordance with P 最大 Output;

[0051] (S.2): Every fixed time t A2 Repeat step (S.1), t A2 Greater than t A1 ;

[0052] When in working state, it includes the following steps:

[0053] (S.1'): Get the water temperature T at the temperature sensor A A , the user sets the temperature T0, the main controller makes a judgment, when T A >T0, the main controller does not make a decision; when T A When <T0, the main controller controls the electric auxiliary heating device 1.5 to heat for a fixed time t A3 ; The main controller calculates P 电 = Q×4.18×(T0-TA), where Q is the flow rate of hot water, and the main controller calculates P 电 The maximum power P that can be achieved with the electric auxiliary heating device 1.5 最大 For comparison, when P 电 <P 最大 When the electric auxiliary heating device is 1.5, it is in accordance with P 电 Output, when P 电 ≥P 最大 When the electric auxiliary heating device is 1.5, it is in accordance with P 最大 Output;

[0054] (S.2'): Get the water temperature T at the temperature sensor A again A , the main controller makes a judgment, when TA >T0, the main controller does not make a decision and burner 5 does not work; when T A When <T0, the main controller controls the burner 5 to heat with a certain heating intensity for a fixed time. The heating intensity of the burner 5 is equivalent to the power P1, P1 = Q×4.18×(T0-T A ), where Q is the flow rate of hot water. When the main controller receives the signal from the water volume sensor, if it determines that the water flow rate is the maximum value, the gas proportional valve is fully opened; if it determines that the water flow rate is half of the maximum value, the gas valve is half opened, and so on;

[0055] (S.3'): Set a positive number △T=0.5 to obtain the water temperature T at the temperature sensor B B , the temperature sensor B corresponds to the location where the hot water finally flows out, and detects the final temperature of the hot water flowing out. The main controller makes a judgment. When T B When the absolute value of -T0 is ≤△T, the main controller does not make a decision;

[0056] When T B When -T0<-△T, increase the heating intensity of burner 5 for a fixed time to obtain water temperature T again. B , if T B -T0<-△T, then continue to increase the heating intensity of the burner 5 for a fixed time, and repeat this cycle until T B -The absolute value of T0 ≤ △T;

[0057] When T B -T0>△T, reduce the heating intensity of burner 5 and heat for a fixed time to obtain water temperature T again B , if T B -T0>△T, then continue to reduce the heating intensity of burner 5 for a fixed time, and repeat this cycle until T B -The absolute value of T0 ≤ △T;

[0058] (S.4'): Repeat steps (S.1') to (S.3').

[0059] The above control method corresponds to a gas water heater, please refer to the attached Figures 3-5 The fan 2 is arranged on one side above the spoiler 1 and covers the side of the spoiler 1. The fan 2 draws air upward. The heat exchanger 3 is arranged below the spoiler 1. The burner 5 is arranged below the heat exchanger 3. The hot air generated by the burner 5 flows to the spoiler 1 after heat exchange in the heat exchanger 3. This arrangement facilitates the fan 2 to draw air upward and forms an up and down arrangement direction.

[0060] The spoiler 1 includes a plurality of flue gas through holes 1.1 arranged in an array and connected thereto, and a heat exchange flow channel 1.2 for circulating water is arranged in the shell side inside the spoiler 1;

[0061] At the same time, the fan 2 has an air suction port, and a smoke collecting wall 4 is arranged between the air suction port and the upper surface of the spoiler 1. The air suction port, the upper surface of the spoiler 1 and the smoke collecting wall 4 constitute a smoke collecting channel a. In the smoke collecting channel a, the area covered by the fan 2 constitutes a first circulation area a.1, and the other part of the area is a second circulation area a.2. The spoiler 1 is arranged above the second circulation area a.2.

[0062] Since the first flow area a.1 is arranged below the fan 2, the smoke will be blocked by the lower surface of the fan 2 when flowing upward in the area, that is, the fan 2 constitutes the source of resistance in the first flow area a.1, while there is no fan 2 in the second flow area a.2 to block the flow of smoke. Therefore, the first flow area a.1 has a greater smoke flow resistance than the second flow area a.2.

[0063] At the same time, the spoiler 1 has a step portion 1.6 that sinks toward the heat exchanger 3, and the spoiler 1 is located below the fan 2 in the horizontal direction, and a resistance reduction opening a.11 that is not covered by the spoiler 1 is formed in the first flow area a.1. In this embodiment, due to the cover of the fan 2, there is a large flow resistance above the first flow area a.1, so the resistance reduction opening a.11 is provided so that the area has a relatively small flow resistance, which is convenient for balancing the flow distribution of the drainage gas and making the gas flow smoother.

[0064] At the same time, in the technical solution of this embodiment, compared with the flat spoiler 1 of the same length, the sunken step portion 1.6 can extend the flow distance and flow time of water in the heat exchange flow channel 1.2, and increase the contact area between the spoiler 1 and the flue gas, thereby obtaining a more sufficient heat exchange effect;

[0065] The sunken step portion 1.6 can also prevent the spoiler 1 and the fan 2 from interfering with each other in the limited internal space of the water heater, thereby facilitating the arrangement of the spoiler 1.

[0066] In a preferred embodiment, the step portion 1.6 extends to the bottom of the fan 2 to extend the length of the spoiler 1 as much as possible, increase the heat exchange area and the distance and duration of fluid flow, and further improve the heat exchange efficiency;

[0067] In a further preferred embodiment, a guide slope 1.61 is formed at the sunken part of the step portion 1.6, and the guide slope 1.61 guides the smoke to flow upward. Due to the existence of the bottom surface of the fan 2, the smoke is in a horizontal flow state after flowing out through the bottom of the fan 2. The horizontal flow direction will interfere with the smoke flowing out of the spoiler 1 upward, which is not conducive to the smoke passing through the spoiler 1. Therefore, the guide slope 1.61 is provided in this embodiment. After the smoke flows out through the bottom of the fan 2, it first flows through the guide slope 1.61, changes its flow direction, avoids its interference with the smoke flowing out of the spoiler 1 upward, and reduces the flow resistance of the smoke.

[0068] At the same time, in this embodiment, an induced air opening a.12 is formed between the guide slope 1.61 and the smoke outflow side of the fan 2. At this time, the induced air opening a.12 is formed by the gap between the guide slope 1.61 and the smoke outflow side of the fan 2. The guide slope 1.61 guides the smoke upward, and the formed induced airflow can guide the smoke to flow into the fan 2.

[0069] In a preferred embodiment, an electric auxiliary heating device 1.5 for heating is arranged inside the heat exchange flow channel 1.2. The electric auxiliary heating device 1.5 includes a heating pipe 1.51 arranged in the shell side of the spoiler 1 and a heating joint 1.52 arranged outside the spoiler 1. The heating pipe 1.51 is spiraled between a plurality of groups of smoke through holes 1.1 to form a circuitous heating structure, so as to further increase the heating area and the contact area with water, and heat rapidly.

[0070] In a preferred embodiment, a water inlet 1.3 and a water outlet 1.4 are provided on the side of the spoiler 1 away from the fan 2, forming a circuitous heat exchange flow channel. At the same time, a heating joint 1.52 is also provided on this side, and the heating joint 1.52 is located between the water inlet 1.3 and the water outlet 1.4. This technical solution facilitates the installation of the water inlet 1.3, the water outlet 1.4 and the heating joint 1.51 by leaving the spoiler 1 empty on one side of the first circulation area a.1.

[0071] In this embodiment, the circuitous heat exchange channel 1.2 can extend the water preheat exchange time as much as possible; preferably, the heat exchange channel 1.2 surrounds the outer wall of each flue gas through hole 1.1 to obtain the largest possible heat exchange area and improve the heat exchange efficiency.

[0072] The heat exchange channel 1.2 is connected to the water flow channel of the heat exchanger 3, and the preheated water flows into the heat exchanger 3 for further heat exchange.

[0073] In the technical solution of this embodiment, after the flue gas passes through the heat exchanger 3, the temperature is still around 100-200°C. The above-mentioned heat exchange flow channel 1.2 is provided to absorb the waste heat of this part of the flue gas, thereby preheating the water. At the same time, the electric auxiliary heating device 1.5 further heats the water, which can greatly reduce the time it takes for the water to be heated to the set temperature. On the basis of the spoiler 1 realizing the drainage balancing function, the heating efficiency of the gas water heater is improved, the waiting time of the user is reduced, and the user experience is improved.

[0074] In a preferred embodiment, the spoiler 1 completely covers the burner 3, and the smoke through hole 1.1 includes a resistance-reducing smoke through hole located in the first flow area a.1. The smoke outflow trajectory of the resistance-reducing smoke through hole points to the resistance-reducing opening a.11. The resistance-reducing smoke through hole points to the resistance-reducing opening a.11 through an inclined flow channel. Compared with the part of the smoke through hole that is straight up and down, the inclined flow channel can extend the contact path and duration between the smoke and the spoiler 1, so that the heat exchange is more sufficient.

[0075] Further preferably, the inclination of the flow channel in the resistance-reducing smoke through hole gradually increases in the direction away from the resistance-reducing opening a.11, so as to more accurately point to the resistance-reducing opening a.11, thereby preventing the smoke from colliding with the surface below the fan 2, thereby reducing the flow resistance of the smoke in the first flow area a.1, balancing the distribution of the smoke, and improving the heat exchange efficiency;

[0076] Further preferably, the smoke holes corresponding to the covered part of the fan 2 have a larger aperture than the smoke holes at other places, and the aperture of the smoke holes gradually decreases along the direction from the covered part to other places. In this embodiment, due to the covering of the fan 2, there is often a larger flow resistance at the covered part, and the smoke holes with larger apertures have relatively smaller flow resistance, which is convenient for balancing the flow distribution of the drainage gas.

[0077] In the description of this specification, the description with reference to the terms "embodiment", "basic embodiment", "preferred embodiment", "other embodiments", "example", "specific example", or "some examples" 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 present invention. In this specification, the schematic representation of the above terms does 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.

[0078] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0079] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. Gas water heater, characterized by: The invention comprises a spoiler (1), a fan (2), a heat exchanger (3) and a burner (5), wherein the fan (2) is arranged above the spoiler (1), the heat exchanger (3) is arranged below the spoiler (1), and the burner (5) is arranged below the heat exchanger (3); The spoiler (1) comprises a plurality of through-going flue gas through holes (1.1) and a heat exchange flow channel (1.2) arranged in the shell side of the spoiler (1); the heat exchange flow channel (1.2) is connected to a water flow channel of the heat exchanger (3); and the spoiler (1) further comprises an electric auxiliary heating device (1.5) arranged in the heat exchange flow channel (1.2) for heating.

2. The gas water heater according to claim 1, characterized in that: The spoiler (1) further comprises a step portion (1.6) that sinks toward the heat exchanger (3); a smoke collecting channel (a) is provided between the air intake port of the fan (2) and the smoke outlet of the heat exchanger (3); the smoke collecting channel (a) comprises a first flow area (a.1) located below the fan (2) and a second flow area (a.2) located in other parts; the first flow area (a.1) comprises a resistance reducing opening (a.11) that is not covered by the spoiler (1).

3. The gas water heater according to claim 2, characterized in that: The step portion (1.6) partially extends to below the fan (2).

4. The gas water heater according to claim 3, characterized in that: A guide slope (1.61) is formed at the initial position where the step portion (1.6) sinks, and the guide slope (1.61) guides the smoke to flow upward.

5. The gas water heater according to claim 4, characterized in that: An introduction opening (a.12) is formed between the guide inclined surface (1.61) and the smoke outflow side of the fan (2).

6. A method for controlling heating by a gas water heater according to any one of claims 1 to 5, characterized in that: When in standby mode, the following steps are included: (S.1): Get the water temperature T at the temperature sensor A A , the user sets the temperature T0, the main controller makes a judgment, when T A >T0, the main controller does not make a decision; when T A When <T0, the main controller controls the electric auxiliary heating device (1.5) to heat for a fixed time t A1 , the temperature sensor A corresponds to the position where water flows into the electric auxiliary heating device (1.5); (S.2): Every fixed time t A2 Repeat step (S.1), t A2 Greater than t A1 ; When in working state, it includes the following steps: (S.1'): Get the water temperature T at the temperature sensor A A , the user sets the temperature T0, the main controller makes a judgment, when T A >T0, the main controller does not make a decision; when T A When <T0, the main controller controls the electric auxiliary heating device (1.5) to heat for a fixed time t A3 ; (S.2'): Get the water temperature T at the temperature sensor A again A , the main controller makes a judgment, when T A >T0, the main controller does not make a decision and the burner (5) does not work; when T A When <T0, the main controller controls the burner (5) to heat at a certain heating intensity for a fixed time; (S.3'): Set a positive number △T to obtain the water temperature T at the temperature sensor B B , the main controller makes a judgment, when T B When the absolute value of -T0 is ≤△T, the main controller does not make a decision, and the temperature sensor B corresponds to the location where the hot water finally flows out; When T B When -T0<-△T, the heating intensity of the burner (5) is increased to heat for a fixed time, and the water temperature T is obtained again. B , if T B -T0<-△T, then continue to increase the heating intensity of the burner (5) for a fixed time, and repeat this cycle until T B -The absolute value of T0 ≤ △T; When T B -T0>△T, reduce the heating intensity of the burner (5) and heat for a fixed time to obtain the water temperature T again B , if T B -T0>△T, then continue to reduce the heating intensity of the burner (5) to heat for a fixed time, and repeat this cycle until T B -The absolute value of T0 ≤ △T; (S.4'): Repeat steps (S.1') to (S.3').

7. The control method according to claim 6, characterized in that: In steps (S.1) and (S.1'), the main controller calculates P 电 = Q × 4.18 × (T0-T A ), where Q is the flow rate of hot water.

8. The control method according to claim 7, characterized in that: In steps (S.1) and (S.1'), the main controller calculates the P 电 The maximum power P that can be achieved by the electric auxiliary heating device (1.5) 最大 For comparison, when P 电 <P 最大 When the electric auxiliary heating device (1.5) is P 电 Output, when P 电 ≥P 最大 When the electric auxiliary heating device (1.5) is P 最大 Output.

9. The control method according to claim 6, characterized in that: In step (S.2'), the heating intensity of the burner (5) is equivalent to the power P1, P1 = Q × 4.18 × (T0-T A ), where Q is the flow rate of hot water.

10. The control method according to claim 6, characterized in that: In step (S.3'), △T=0.5.

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