Heating furnace and its control method

Abstract

This application relates to a heating furnace and its control method. A control method for a heating furnace includes: when the heating furnace is in the bathroom water use mode and in the heating and bathroom mode, determining whether the actual water temperature of the bathroom outlet pipe is greater than or equal to a first preset temperature; if so, stopping the heating and bathroom mode; and controlling the heating furnace to operate in the water tank heat preservation mode so that the actual water temperature of the bathroom outlet pipe is not less than a second preset temperature; the second preset temperature is greater than or equal to the first preset temperature. By using the heating and bathroom mode to preheat the water in the bathroom outlet pipe and then using the water tank heat preservation mode to keep the water in the bathroom outlet pipe warm, the operation time of the heating and bathroom mode can be reduced, and it also avoids the frequent switching between the heating and bathroom mode and the single heating mode of the heating furnace due to the heat preservation of the bathroom outlet pipe during heating, reducing the impact on the user's heating.

Description

Technical Field

[0001] This application relates to the technical field of heating furnaces, and particularly to heating furnaces and their control methods. Background Art

[0002] A heating furnace refers to a hot water boiler that uses gas combustion to heat water to a certain temperature and realizes the heating demand through heating pipes and radiators.

[0003] Current heating furnaces have a heating mode and a sanitary mode. During the operation of the sanitary mode, the heating furnace usually operates in the sanitary mode to preheat the sanitary outlet pipe of the heating furnace. After the preheating of the sanitary outlet pipe is completed, it is also necessary to use the sanitary mode to keep the sanitary outlet pipe warm. During the heat preservation heating process, frequent switching between the heating mode and the sanitary mode is likely to occur, which will affect the user's heating. Summary of the Invention

[0004] Based on this, it is necessary to provide a heating furnace and its control method for solving the problem of frequent switching between the heating mode and the sanitary mode during the heat preservation heating process.

[0005] According to one aspect of the present application, a control method for a heating furnace is provided. The heating furnace includes a heating furnace body, a sanitary heat exchanger, a water tank, and a sanitary outlet pipe communicating with the water tank;

[0006] The heating furnace body has a heating outlet pipe, and the heating outlet pipe includes a heating branch pipe and a sanitary branch pipe connected to the sanitary heat exchanger;

[0007] The sanitary heat exchanger is connected to the water tank through a pipeline;

[0008] The control method of the heating furnace includes:

[0009] When the heating furnace is in the heating and sanitary mode, it is judged whether the actual water temperature of the sanitary outlet pipe is greater than or equal to a first preset temperature; if so, the heating furnace is controlled to switch from the heating and sanitary mode to the water tank heat preservation mode, so that the actual water temperature of the sanitary outlet pipe is not less than a second preset temperature;

[0010] Wherein, when the heating furnace is in the heating and sanitary mode, the heating outlet pipe is communicated with the sanitary branch pipe;

[0011] When the heating furnace is in the water tank heat preservation mode, the heating outlet pipe is communicated with the heating branch pipe;

[0012] The second preset temperature is greater than or equal to the first preset temperature.

[0013] In one embodiment, after controlling the heating furnace to switch from the heating and sanitary mode to the water tank heat preservation mode so that the actual water temperature of the sanitary water outlet pipe is not less than the second preset temperature, the control method of the heating furnace further includes:

[0014] If the actual water temperature of the sanitary water outlet pipe is less than or equal to the third preset temperature, control the heating furnace to switch from the water tank heat preservation mode to the heating and sanitary mode;

[0015] Wherein, the third preset temperature is less than the first preset temperature.

[0016] In one embodiment, after controlling the heating furnace to switch from the water tank heat preservation mode to the heating and sanitary mode if the actual water temperature of the sanitary water outlet pipe is less than or equal to the third preset temperature, the control method of the heating furnace further includes:

[0017] Return to execute the step of judging whether the actual water temperature of the sanitary water outlet pipe is greater than or equal to the first preset temperature.

[0018] In one embodiment, before judging whether the actual water temperature of the sanitary water outlet pipe is greater than or equal to the first preset temperature when the heating furnace is in the heating and sanitary mode, the control method of the heating furnace further includes:

[0019] Control the heating furnace to operate in the water tank heat preservation mode;

[0020] Judge whether the heating furnace is in the sanitary water use mode for the first time; if so, control the heating furnace to switch from the water tank heat preservation mode to the heating and sanitary mode.

[0021] In one embodiment, the control method of the heating furnace further includes:

[0022] If the heating furnace is not in the sanitary water use mode for the first time, judge whether the operation time of the sanitary water use mode meets the first condition and whether the actual water temperature of the sanitary water outlet pipe meets the second condition;

[0023] If the first condition and the second condition are met, execute the step of controlling the heating furnace to switch from the water tank heat preservation mode to the heating and sanitary mode;

[0024] Wherein, the first condition is that the operation time of the sanitary water use mode is greater than the critical time of sanitary water use, and the second condition is that the actual water temperature of the sanitary water outlet pipe is less than or equal to the lower limit temperature of heat preservation;

[0025] The lower limit temperature of heat preservation is less than the third preset temperature.

[0026] In one embodiment, the control method of the heating furnace further includes:

[0027] If the first condition and / or the second condition are not satisfied, then control the heating furnace to maintain the operation of the water tank heat preservation mode.

[0028] In one embodiment, the number of the water tanks is two; the control of switching the heating furnace from the heating and sanitary mode to the water tank heat preservation mode so that the actual water temperature of the sanitary outlet pipe is not less than the second preset temperature specifically includes:

[0029] Heat the liquid in one of the water tanks. If the actual water temperature of the sanitary outlet pipe is less than the second preset temperature after a preset time interval, then heat the liquid in the other water tank until the actual water temperature of the sanitary outlet pipe is not less than the second preset temperature.

[0030] According to another aspect of the present application, there is provided a heating furnace, including a heating furnace body, a sanitary heat exchanger, a water tank, and a sanitary outlet pipe communicated with the water tank;

[0031] The heating furnace body has a heating outlet pipe, and the heating outlet pipe includes a heating branch pipeline and a sanitary branch pipeline connected to the sanitary heat exchanger;

[0032] The sanitary heat exchanger is connected to the water tank through a pipeline;

[0033] The heating furnace further includes a control device, and the control device is configured to judge whether the actual water temperature of the sanitary outlet pipe is greater than or equal to a first preset temperature when the heating furnace is in the heating and sanitary mode; if so, then control the heating furnace to switch from the heating and sanitary mode to the water tank heat preservation mode so that the actual water temperature of the sanitary outlet pipe is not less than the second preset temperature;

[0034] Wherein, when the heating furnace is in the heating and sanitary mode, the heating outlet pipe is communicated with the sanitary branch pipeline;

[0035] When the heating furnace is in the water tank heat preservation mode, the heating outlet pipe is communicated with the heating branch pipeline;

[0036] The second preset temperature is greater than or equal to the first preset temperature.

[0037] In one embodiment, the heating outlet pipe includes a heating and sanitary switching valve, and the heating and sanitary switching valve is arranged at the connection of the heating branch pipeline and the sanitary branch pipeline.

[0038] In one embodiment, the water tank includes a water tank body and a water tank heat exchange pipe arranged in the water tank body;

[0039] Both ends of the water tank heat exchange pipe are respectively communicated with the bathroom heat exchanger and the bathroom water outlet pipe.

[0040] The above heating furnace and its control method utilize the heating and bathroom mode to heat the actual water temperature of the bathroom water outlet pipe to be greater than or equal to the first preset temperature (equivalent to the target water outlet temperature of the bathroom water outlet pipe). After stopping the heating and bathroom mode, the actual water temperature of the bathroom water outlet pipe is maintained at a second preset temperature greater than or equal to the first preset temperature by means of the water tank heat preservation mode. That is to say, the water in the bathroom water outlet pipe is preheated by using the heating and bathroom mode, and then the water in the bathroom water outlet pipe is heat-preserved by using the water tank heat preservation mode, which can reduce the running time of the heating and bathroom mode and also avoid the frequent switching between the heating and bathroom mode and the single heating mode of the heating furnace during heating due to the heat preservation of the bathroom water outlet pipe, reducing the impact on the user's heating. Brief Description of the Drawings

[0041] Figure 1 Shows the structural schematic diagram of a heating furnace in an embodiment of the present application;

[0042] Figure 2 Shows the flow schematic diagram of the control method of a heating furnace in an embodiment of the present application;

[0043] Figure 3 Shows the three-dimensional structural schematic diagram of a heating furnace in an embodiment of the present application;

[0044] Figure 4 Shows the front view of a heating furnace in an embodiment of the present application;

[0045] Figure 5 Shows the structural schematic diagram of a water tank in an embodiment of the present application.

[0046] In the figure: 10, heating furnace; 110, heating furnace body; 111, heating water outlet pipe; 1111, heating and bathroom switching valve; 112, heating return pipe; 1121, heating circulation pump; 113, heating branch pipeline; 114, bathroom branch pipeline; 115, heating heat exchanger; 116, combustion mechanism; 120, bathroom heat exchanger; 130, water tank; 131, water tank body; 132, water tank heat exchange pipe; 133, heating element; 140, bathroom water outlet pipe; 1401, bathroom return pipe; 1402, bathroom circulation pump; 150, water inlet pipe; 160, housing. Detailed Embodiments

[0047] To make the above objects, features, and advantages of the present application more apparent and understandable, the following provides a detailed description of the specific embodiments of the present application with reference to the accompanying drawings. Many specific details are set forth in the following description to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the spirit of the present application. Therefore, the present application is not limited by the specific embodiments disclosed below.

[0048] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. These are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present application.

[0049] In addition, the terms "first" and "second" are used only for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one of these features. In the description of the present application, "a plurality" means two or more, such as two, three, etc., unless otherwise specifically and clearly defined.

[0050] In the present application, unless otherwise clearly specified and limited, the terms "mounted", "connected", "coupled", "fixed", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0051] In the present application, unless otherwise clearly specified and limited, the first feature being "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over", and "on top of" the second feature can be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath", and "underneath" the second feature can be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0052] It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are only for illustrative purposes and do not represent the only implementation.

[0053] Figure 1 The structural schematic diagram of the heating furnace 10 in an embodiment of the present application is shown.

[0054] Refer to Figure 1 , the heating furnace 10 provided in an embodiment of the present application includes a heating furnace body 110, a bathroom heat exchanger 120, a water tank 130, a bathroom water outlet pipe 140 communicated with the water tank 130, and a water inlet pipe 150 connected to the side of the bathroom heat exchanger 120 away from the water tank 130.

[0055] The heating furnace body 110 has a heating water outlet pipe 111, and the hot water produced by the heating furnace body 110 flows out from the heating water outlet pipe 111. Specifically, the heating furnace body 110 further includes a heating return pipe 112 connected to the water inlet pipe 150, a heating heat exchanger 115 and a combustion mechanism 116. One end of the heating return pipe 112 away from the water inlet pipe 150 is connected to the heating water outlet pipe 111, and the water source conveys cold water to the heating return pipe 112 through the water inlet pipe 150. The high-temperature flue gas generated by the combustion of the combustion mechanism 116 will pass through the heating heat exchanger 115 and exchange heat with the cold water flowing from the water inlet pipe 150 to the heating return pipe 112, heating this part of the cold water, and the obtained hot water then flows out from the heating water outlet pipe 111.

[0056] The heating water outlet pipe 111 includes a heating branch pipe 113 and a bathroom branch pipe 114 connected to the bathroom heat exchanger 120, and the hot water flowing out from the heating water outlet pipe 111 can flow into the heating branch pipe 113 and / or the bathroom branch pipe 114 respectively.

[0057] The bathroom heat exchanger 120 is connected to the water tank 130 through pipelines. The water inlet pipe 150 is connected to the side of the bathroom heat exchanger 120 away from the water tank 130, and the bathroom water outlet pipe 140 communicates with the water tank 130. Then, the cold water flowing out of the water inlet pipe 150 will flow through the bathroom heat exchanger 120, and then flow to the water tank 130 and the bathroom water outlet pipe 140. The hot water flowing into the bathroom branch pipeline 114 can exchange heat with the fluid flowing from the water inlet pipe 150 to the bathroom water outlet pipe 140 by means of the bathroom heat exchanger 120. When the heating furnace 10 operates in the heating and bathroom mode, the cold water flowing from the water inlet pipe 150 to the bathroom water outlet pipe 140 flows through the bathroom heat exchanger 120 and can exchange heat with the hot water flowing from the bathroom branch pipeline 114 into the bathroom heat exchanger 120, so as to heat the cold water flowing from the water inlet pipe 150 to the bathroom water outlet pipe 140. The heated hot water can flow out of the bathroom water outlet pipe 140 and can be used by users for bathing. In addition, the fluid flowing from the bathroom heat exchanger 120 to the bathroom water outlet pipe 140 can exchange heat with the water in the water tank 130.

[0058] Optionally, a heating circulation pump 1121 is provided on the heating return pipe 112. The heating return pipe 112, the heating outlet pipe 111 and the bathroom branch pipeline 114 are connected to form a heating circulation pipeline. Driven by the heating circulation pump 1121, the water in the heating circulation pipeline circulates.

[0059] Optionally, the heating furnace 10 further includes a bathroom return pipe 1401 connected to the bathroom water outlet pipe 140. One end of the bathroom return pipe 1401 away from the bathroom water outlet pipe 140 is connected to the water inlet pipe 150, so that the water inlet pipe 150, the bathroom heat exchanger 120, the bathroom water outlet pipe 140 and the bathroom return pipe 1401 are connected to form a bathroom circulation pipeline. The hot water flowing out of the bathroom water outlet pipe 140 can flow into the water inlet pipe 150 through the bathroom return pipe 1401 and then flow to the bathroom heat exchanger 120 and the bathroom water outlet pipe 140 again, which is beneficial to quickly reaching the target outlet water temperature T0 of the bathroom water outlet pipe 140.

[0060] Optionally, a bathroom circulation pump 1402 is provided on the bathroom return pipe 1401. Driven by the bathroom circulation pump 1402, the water in the bathroom circulation pipeline circulates.

[0061] Figure 2 The flow chart of the control method of the heating furnace 10 in an embodiment of the present application is shown.

[0062] Refer to Figure 2 , the control method of the heating furnace 10 includes the following steps:

[0063] Start the heating furnace 10.

[0064] S410. When the heating furnace 10 is in the heating and sanitary ware mode, determine whether the actual water temperature of the sanitary ware outlet pipe 140 is greater than or equal to the first preset temperature T1.

[0065] When the heating furnace 10 is in the heating and sanitary ware mode, the heating outlet pipe 111 is connected to the sanitary ware branch pipe 114. The fluid flowing out of the water inlet pipe 150 flows through the sanitary ware heat exchanger 120 and then to the sanitary ware outlet pipe 140 in sequence, and the fluid flowing out of the heating outlet pipe 111 flows to the sanitary ware branch pipe 114. The hot water flowing out of the heating outlet pipe 111 is used to heat the cold water flowing from the water inlet pipe 150 to the sanitary ware heat exchanger 120 and the sanitary ware outlet pipe 140. That is to say, when the heating furnace 10 is in the heating and sanitary ware mode, the cold water flowing from the water inlet pipe 150 to the sanitary ware outlet pipe 140 can be heated by the hot water produced by the heating furnace body 110.

[0066] S420. If the actual water temperature of the sanitary ware outlet pipe 140 is greater than or equal to the first preset temperature T1, stop the heating and sanitary ware mode. The first preset temperature T1 is equivalent to the target outlet water temperature T0 of the sanitary ware outlet pipe 140.

[0067] S422. Control the heating furnace 10 to switch from the heating and sanitary ware mode to the water tank heat preservation mode, so that the actual water temperature of the sanitary ware outlet pipe 140 is not less than the second preset temperature T2, where the second preset temperature T2 is greater than or equal to the first preset temperature T1. By using the heating and sanitary ware mode, the actual water temperature of the sanitary ware outlet pipe 140 can be heated to the target outlet water temperature T0 of the sanitary ware outlet pipe 140, then stop the heating and sanitary ware mode, and then use the water tank heat preservation mode to keep the actual water temperature of the sanitary ware outlet pipe 140 at the second preset temperature T2 which is greater than or equal to the first preset temperature T1. That is to say, by preheating the water in the sanitary ware outlet pipe 140 using the heating and sanitary ware mode and then insulating the water in the sanitary ware outlet pipe 140 using the water tank heat preservation mode, the operation time of the heating and sanitary ware mode can be reduced, and it also avoids the frequent switching between the heating and sanitary ware mode and the single heating mode of the heating furnace 10 due to the heat preservation of the sanitary ware outlet pipe 140 during heating, reducing the impact on the user's heating.

[0068] It should be noted that when the heating furnace 10 is in the water tank heat preservation mode, the heating outlet pipe 111 is connected to the heating branch pipe 113, and the heating outlet pipe 111 is not connected to the sanitary ware branch pipe 114. Then, the fluid flowing out of the heating outlet pipe 111 only flows to the heating branch pipe 113. The heating furnace 10 is still in the single heating mode, and the heating demand and the sanitary ware demand can be satisfied simultaneously without mutual influence, better reducing the impact on the user's heating. Specifically, when the heating furnace 10 is in the water tank heat preservation mode, the fluid flowing out of the water inlet pipe 150 flows through the sanitary ware heat exchanger 120 and then to the sanitary ware outlet pipe 140 in sequence, and the fluid flowing out of the heating outlet pipe 111 flows to the heating branch pipe 113. By using the water tank heat preservation mode, the actual water temperature of the sanitary ware outlet pipe 140 is not less than the second preset temperature T2, so that the actual water temperatures of the sanitary ware outlet pipe 140 and the sanitary ware return pipe 1401 and the water temperature in the water tank 130 are approximately the same and in a heat preservation state.

[0069] Optionally, the first preset temperature T1 is equal to the target outlet water temperature T0 of the sanitary ware outlet pipe 140. Considering the heat loss in the pipeline, the second preset temperature T2 can be made greater than the target outlet water temperature T0 of the sanitary ware outlet pipe 140.

[0070] Specifically, the first preset temperature T1 is equal to T0, and the second preset temperature T2 is equal to T0 + 3.

[0071] Furthermore, the heating outlet pipe 111 further includes a heating and sanitary ware switching valve 1111, and the heating and sanitary ware switching valve 1111 is arranged at the connection of the heating branch pipe 113 and the sanitary ware branch pipe 114. The heating and sanitary ware switching valve 1111 can be controlled to switch to connect the heating outlet pipe 111 with the sanitary ware branch pipe 114 so that the heating furnace 10 operates in the heating and sanitary ware mode. The heating and sanitary ware switching valve 1111 can also be controlled by the control device to switch to connect the heating outlet pipe 111 with the heating branch pipe 113 so that the heating furnace 10 operates in the water tank heat preservation mode and the single heating mode.

[0072] Furthermore, please refer to again Figure 2 , after S420 which controls the heating furnace 10 to switch from the heating and sanitary ware mode to the water tank heat preservation mode so that the actual water temperature of the sanitary ware outlet pipe 140 is not less than the second preset temperature T2, the control method of the heating furnace 10 further includes:

[0073] S430, determining whether the actual water temperature of the sanitary ware outlet pipe 140 is less than or equal to the third preset temperature T3.

[0074] S440. If the actual water temperature of the bathroom outlet pipe 140 is less than or equal to the third preset temperature T3, control the heating furnace 10 to switch from the water tank heat preservation mode to the heating and bathroom mode, where the third preset temperature T3 is less than the first preset temperature T1. During the operation of the heating furnace 10 in the water tank heat preservation mode, due to the different lengths of the hot water pipes of each user and the different heat preservation effects (where the hot water pipes include the bathroom outlet pipe 140 and the bathroom return pipe 1401, etc.), the heat dissipation speeds of the hot water pipes of each user are different. Therefore, in the water tank heat preservation mode, it is necessary to continuously monitor the temperature of the hot water pipes. At this time, the actual water temperature of the bathroom outlet pipe 140 is less than or equal to the third preset temperature T3, and the third preset temperature T3 is less than the first preset temperature T1. If the first preset temperature T1 is equal to T0, it means that the actual water temperature of the bathroom outlet pipe 140 is relatively low. It is better to select the heating and bathroom mode to heat the cold water flowing from the water inlet pipe 150 to the bathroom outlet pipe 140. The reason may be that: in some embodiments, in order not to affect the household power grid, the water tank heat preservation mode usually uses the heating element 133 for heating, and the power of the heating element 133 is usually small. If the heat dissipation speed of the user's hot water pipe is large, then, in the water tank heat preservation mode, using the heating element 133 for heating cannot make up for the heat dissipation of the hot water pipe, and then the temperature of the hot water pipe will continue to drop. At this time, it is not suitable to use the heating element 133 for heating, and it is more appropriate to switch the water tank heat preservation mode to the heating and bathroom mode.

[0075] Optionally, the third preset temperature T3 = T0 - 5.

[0076] Further, please refer to again Figure 2 , after step S440 of controlling the heating furnace 10 to switch from the water tank heat preservation mode to the heating and bathroom mode if the actual water temperature of the bathroom outlet pipe 140 is less than or equal to the third preset temperature T3, the control method of the heating furnace 10 further includes:

[0077] Return to execute step S410 of determining whether the actual water temperature of the bathroom outlet pipe 140 is greater than or equal to the first preset temperature T1 when the heating furnace 10 is in the bathroom water use mode and the heating and bathroom mode. So that during the operation of the heating and bathroom mode, when the actual water temperature of the bathroom outlet pipe 140 is greater than or equal to the first preset temperature T1, it can be switched from the heating and bathroom mode to the water tank heat preservation mode, further reducing the operation time of the heating and bathroom mode, reducing the impact on user heating caused by the heating and bathroom mode, and also improving the flexibility of the control method.

[0078] Further, please refer to again Figure 2 , before step S410 of determining whether the actual water temperature of the bathroom outlet pipe 140 is greater than or equal to the first preset temperature T1 when the heating furnace 10 is in the bathroom water use mode and the heating and bathroom mode, the control method of the heating furnace 10 further includes:

[0079] Further, before step S410 of determining whether the actual water temperature of the bathroom outlet pipe 140 is greater than or equal to the first preset temperature T1 when the heating furnace 10 is in the heating and bathroom mode, the control method of the heating furnace 10 further includes:

[0080] S400. Control the heating furnace 10 to operate in the water tank heat preservation mode. After the heating furnace 10 is started, before the user uses the bathroom water, the heating furnace 10 can be controlled to operate in the water tank heat preservation mode, so that the actual water temperature of the bathroom outlet pipe 140 is not less than the second preset temperature T2. The water in the water tank 130 can be heated under off-peak power consumption conditions, and the water temperature in the water tank 130 and the water temperature of the bathroom outlet pipe 140 are made substantially the same and tend to be in a constant temperature state. In this way, when the user uses the bathroom water during the peak power consumption period, the effect of hot water on demand can be achieved. In addition, before the user uses the bathroom water, the actual water temperature of the bathroom outlet pipe 140 can be made greater than or equal to the second preset temperature T2, and the second preset temperature T2 is greater than or equal to the first preset temperature T1, which can further reduce the preheating time using the heating and bathroom mode and further reduce the impact on the user's heating.

[0081] Optionally, during the preheating process using the heating and bathroom mode, the water in the bathroom circulation pipeline can be circulated by means of the bathroom circulation pump 1402 to improve the preheating efficiency. The water in the bathroom circulation pipeline can also be circulated in the water tank heat preservation mode to improve the heat preservation efficiency. Driven by the bathroom circulation pump 1402, the water in the bathroom circulation pipeline circulates, and finally the water temperature in the bathroom circulation pipeline is made the same as the water temperature in the water tank 130, which is more conducive to quickly making the actual water temperature of the bathroom outlet pipe 140 greater than or equal to the second preset temperature T2.

[0082] Optionally, when there is off-peak power consumption, the heating furnace 10 is controlled to operate in the water tank heat preservation mode to heat the water in the water tank 130, so that the water temperature in the water tank 130 and the water temperature of the bathroom outlet pipe 140 are substantially at the second preset temperature T2 and tend to be in a constant temperature state. In this way, when the user uses the bathroom water during the peak power consumption period, the effect of hot water on demand can be achieved.

[0083] S401. Determine whether the heating furnace 10 is in the bathroom water use mode for the first time.

[0084] Wherein, if the heating furnace 10 is in the bathroom water use mode, it indicates that the user starts to use the bathroom water, that is, the cold water flowing out of the water inlet pipe 150 will flow through the bathroom heat exchanger 120 and the bathroom outlet pipe 140 in sequence.

[0085] Optionally, the bathroom water use mode includes a bathroom circulation mode. When the heating furnace 10 is in the bathroom circulation mode, the bathroom circulation pump 1402 operates and the water in the bathroom circulation pipeline circulates.

[0086] Optionally, the sanitary water use mode of the heating furnace 10 can be triggered and started when the user uses sanitary water, or the sanitary water use mode of the heating furnace 10 can be started by means of the sanitary button of the heating furnace 10, or the sanitary water use mode of the heating furnace 10 can be turned on through a client wirelessly communicatively connected to the heating furnace 10.

[0087] S403. If the heating furnace 10 is in the sanitary water use mode for the first time, control the heating furnace 10 to switch from the water tank heat preservation mode to the heating and sanitary mode. After the heating furnace 10 is started, if the heating furnace 10 is in the sanitary water use mode for the first time, it means that the heating and sanitary mode has not been turned on after the heating furnace 10 is turned on. Simply relying on the water tank heat preservation mode may not meet the user's sanitary water requirements. At this time, it is not suitable to use the water tank heat preservation mode for heating, but it is more suitable to use the heating and sanitary mode for heating so that the actual water temperature of the sanitary water outlet pipe 140 can reach the first preset temperature T1, and then the actual temperature of the sanitary water outlet pipe 140 can reach its target outlet water temperature, and then use the water tank heat preservation mode for heat preservation, so as to meet the sanitary water use requirements.

[0088] Further, please refer to again Figure 2 , the control method of the heating furnace 10 further includes:

[0089] If the heating furnace 10 is not in the sanitary water use mode for the first time, judge whether the running time of the sanitary water use mode meets the first condition and whether the actual water temperature of the sanitary water outlet pipe 140 meets the second condition.

[0090] If the first condition and the second condition are met, execute step S403 of controlling the heating furnace 10 to switch from the water tank heat preservation mode to the heating and sanitary mode.

[0091] Among them, the first condition is that the operation time of the bathroom water use mode is greater than the critical time t1 for bathroom water use, and the second condition is that the actual water temperature of the bathroom outlet pipe 140 is less than or equal to the lower limit temperature for heat preservation. The lower limit temperature for heat preservation is less than the third preset temperature T3. Whether the user briefly uses bathroom water is judged according to the critical time t1 for bathroom water use. The lower limit temperature for heat preservation refers to the lower limit temperature of the water tank heat preservation mode when the heating furnace 10 operates. Under the condition that the heating furnace is not in the bathroom water use mode for the first time, it is judged whether it is necessary to make the heating furnace 10 operate the water tank heat preservation mode and whether there is a need to switch to other modes. At this time, if the operation time of the bathroom water use mode is greater than the critical time t1 for bathroom water use and the actual water temperature of the bathroom outlet pipe 140 is less than or equal to the lower limit temperature for heat preservation, it indicates that the user starts to use bathroom water for a long time. It is very likely that the user has the need to take a bath, and the actual water temperature of the bathroom outlet pipe 140 is lower than the third preset temperature, which also indicates that at this time, the water tank heat preservation mode can no longer meet the user's bathroom needs. Then, the heating method using the heating element 133 is not very suitable, and it is more suitable to select the heating and bathroom mode, such as the heating method by means of the combustion mechanism 116 of the heating furnace body 110, the heating heat exchanger 115 and the bathroom heat exchanger 120, etc.

[0092] Optionally, the lower limit temperature for heat preservation = T0 - 10.

[0093] Optionally, the critical time t1 for bathroom water use = 0.5 - 2 minutes.

[0094] Furthermore, please refer to again Figure 2 The control method of the heating furnace 10 further includes: if the first condition and / or the second condition is not satisfied, then controlling the heating furnace 10 to maintain the operation of the water tank heat preservation mode so that the actual water temperature of the bathroom outlet pipe 140 is not less than the second preset temperature T2 in step S422.

[0095] If the first condition is not satisfied, it indicates that the operation time of the bathroom water use mode is less than or equal to the critical time t1 for bathroom water use, that is, it indicates that the user only briefly uses bathroom water and may not actually have the need to take a bath. Then, the heating furnace 10 can be made to operate the water tank heat preservation mode.

[0096] If the second condition is not satisfied, it indicates that the actual water temperature of the bathroom outlet pipe 140 is greater than the lower limit temperature for heat preservation. That is to say, the water temperature in the water tank 130 is not low, and after the bathroom water use mode, because the heating furnace 10 is not in the bathroom water use mode for the first time, it means that the heating and bathroom mode has been used, and it is very likely that the water temperature in the water tank 130 is relatively high. It is even possible that the heating furnace 10 is still in the water tank heat preservation mode and the actual water temperature of the bathroom outlet pipe 140 is relatively high. Then, continuing to heat with the heating element 133 is sufficient to meet the user's bathroom needs, and the heating furnace 10 can also be made to operate the water tank heat preservation mode.

[0097] When the running time of the bathroom water usage mode is less than or equal to the critical time t1 of bathroom water usage, and the actual water temperature of the bathroom outlet pipe 140 is greater than the lower limit temperature of heat preservation, when at least one of the first condition and the second condition is not satisfied, the heating furnace 10 can operate in the water tank heat preservation mode. And by means of the above two conditions, the heating furnace 10 "prioritizes" to select the water tank heat preservation mode, reducing the running time of the heating and bathroom mode and also reducing the impact on the user's heating.

[0098] Further, the number of water tanks 130 is two, and a heating element 133 for heating the liquid in each water tank 130 can be arranged on each water tank 130.

[0099] To make the actual water temperature of the bathroom outlet pipe 140 not less than the second preset temperature T2 is achieved by the following steps:

[0100] Heat the liquid in one of the two water tanks 130. If after a preset time interval, the actual water temperature of the bathroom outlet pipe 140 is less than the second preset temperature T2, then heat the liquid in the other water tank 130 of the two water tanks until the actual water temperature of the bathroom outlet pipe 140 is not less than the second preset temperature T2. The heating element 133 can be used to heat the water in the corresponding water tank 130. The two water tanks 130 of the water tank assembly are independently controlled. First, start the heating element 133 corresponding to one of the water tanks 130. After a preset time interval, according to whether the actual water temperature of the bathroom outlet pipe 140 is less than the second preset temperature T2, judge whether to start the heating element 133 corresponding to the other water tank 130. During this period, if the actual water temperature of the bathroom outlet pipe 140 is greater than or equal to the second preset temperature T2, then stop the heating element 133 from heating.

[0101] In some embodiments, the preset time interval is 3 - 10 minutes.

[0102] Further, the heating furnace 10 further includes a control device configured to judge whether the actual water temperature of the bathroom outlet pipe 140 is greater than or equal to the first preset temperature T1 when the heating furnace 10 is in the bathroom water usage mode and in the heating and bathroom mode; if so, control the heating furnace 10 to switch from the heating and bathroom mode to the water tank heat preservation mode so that the actual water temperature of the bathroom outlet pipe 140 is not less than the second preset temperature T2.

[0103] Optionally, the heating furnace 10 further includes a temperature probe arranged on the bathroom outlet pipe 140, and the temperature probe and all heating elements 133 are respectively electrically connected to the control device. The control device makes at least one of the two heating elements 133 heat according to the actual water temperature of the bathroom outlet pipe 140 obtained by the temperature probe.

[0104] Refer to Figure 3 and Figure 4, two water tanks 130 are arranged side by side in the first direction to form a water tank assembly disposed on one side of the heating furnace body 110 in the second direction. Among them, the heating furnace body 110 has a front side, and a first side and a second side adjacent to and parallel to the front side. The first direction is the direction from the first side to the second side, and the second direction is perpendicular to the front side of the heating furnace body 110. Specifically, in the embodiment shown in Figure 3 and 4 , the first direction is the front-back direction, and the second direction is the left-right direction, which can make the water tank assembly and the heating furnace body 110 arranged compactly.

[0105] The orthographic projections of the two water tanks 130 in the water tank assembly on the second side completely fall within the second side. It can be understood that the dimension of the water tank assembly in the first direction is not greater than the dimension of the heating furnace body 110 in the first direction. Then, the occupied dimension of the heating furnace body 110 and the water tank assembly in the first direction is equal to the dimension of the heating furnace body 110 in the first direction, and the occupied dimension of the heating furnace body 110 and the water tank assembly in the second direction is approximately equal to the sum of the dimensions of the heating furnace body 110 and one water tank 130 in the second direction; usually, a water tank 130 with a larger capacity will be selected under the same surface area. Correspondingly, the water tank 130 will be selected as a cylindrical water tank 130. Therefore, taking a single large cylindrical water tank as the reference object, under the condition that the volume of the reference object is equal to the total volume of the two water tanks 130 and the height of the reference object is equal to the height of the water tank 130, the occupied dimension of the heating furnace body 110 and the single large water tank in the first direction is still equal to the dimension of the heating furnace body 110 in the first direction, and the occupied dimension of the heating furnace body 110 and the single large water tank in the second direction is approximately equal to the sum of the dimensions of the heating furnace body 110 and the single large water tank in the second direction. Obviously, the diameter of the water tank 130 is smaller than the diameter of the single large water tank. Then, the occupied dimension of the heating furnace body 110 and the single large water tank in the second direction is greater than the occupied dimension of the heating furnace body 110 and the water tank assembly in the second direction. Therefore, compared with the overall occupied space of the single large water tank and the heating furnace body 110, the overall occupied space of the two water tanks 130 and the heating furnace body 110 is smaller, which is beneficial to reducing the volume of the whole machine and can minimize the installation space of the heating furnace 10 to the greatest extent.

[0106] In some embodiments, the water tank 130 has a cylindrical structure. The diameter of the water tank 130 is 140 mm, and the total water volume of the two water tanks 130 is 18.5 L. If a single large water tank with a volume of 18.5 L is used as a reference object, when the heights of the large water tank and the water tank 130 are the same, the diameter of the single large water tank is approximately 210 mm. If the dimension of the heating furnace body 110 along the first direction is L1, and the dimension of the heating furnace body 110 along the second direction is L2, where L1 is greater than 280 mm, then the overall occupied dimension of the two water tanks 130 and the heating furnace body 110 along the first direction is equal to L1, and the overall occupied dimension of the two water tanks 130 and the heating furnace body 110 along the second direction is approximately equal to L2 + 140 mm; while the overall occupied dimension of the single large water tank and the heating furnace body 110 along the first direction is also equal to L1, and the overall occupied dimension of the single large water tank and the heating furnace body 110 along the second direction is approximately equal to L2 + 210 mm. Obviously, the overall occupied space of the two water tanks 130 and the heating furnace body 110 is smaller.

[0107] Further, please refer to Figure 1 again, and in combination with Figure 5 , each water tank 130 includes a water tank body 131 and a water tank heat exchange tube 132 disposed in the water tank body 131. The water tank 130 is in heat exchange contact with the fluid flowing from the bathroom heat exchanger 120 to the bathroom water outlet pipe 140 by means of the water tank heat exchange tube 132. The two ends of the water tank heat exchange tube 132 are respectively communicated with the bathroom heat exchanger 120 and the bathroom water outlet pipe 140. Specifically, the water tank heat exchange tubes 132 of the two water tanks 130 are connected to each other, and the ends of the water tank heat exchange tubes 132 of the two water tanks 130 away from each other are respectively connected to the bathroom heat exchanger 120 and the bathroom water outlet pipe 140. Cold water flows from the water inlet pipe 150 to the bathroom heat exchanger 120, can exchange heat with the hot water flowing into the bathroom heat exchanger 120 from the bathroom branch pipe 114, will flow into the two water tank heat exchange tubes 132 in sequence, can exchange heat with the water in the water tank 130, and finally flow to the bathroom water outlet pipe 140. The cold water flowing from the water inlet pipe 150 to the bathroom water outlet pipe 140 can be heated by the hot water produced by the heating furnace body 110, and further, the heat loss of the hot water passing through the water tank heat exchange tube 132 can be avoided by means of the water tank 130 with a heating function, achieving the effect of instant hot water, and the user experience can be improved.

[0108] Further, please refer to Figure 5 again. The water tank heat exchange tube 132 is configured to extend helically from one end of the water tank body 131 to the other end of the water tank body 131 around the central axis of the water tank body 131. The contact area between the water tank heat exchange tube 132 and the water in the water tank body 131 can be increased, and the heat exchange efficiency between the water in the water tank heat exchange tube 132 and the water in the water tank body 131 can be improved.

[0109] Further, please refer toFigure 1 On each water tank body 131, there is a heating element 133 for heating the fluid in the corresponding water tank body 131. The two heating elements 133 can be used for heating operations together, or one of the heating elements 133 can be used for heating operations. The number of heating elements 133 for heating operations can be selected according to actual needs.

[0110] Further, please refer to again Figure 1 One end of the heating element 133 is connected to the water tank 130, and the other end extends into the water tank 130. The heating element 133 is placed inside the water tank 130, which can further reduce the overall occupied space of the water tank 130.

[0111] Optionally, the heating element 133 is a heating coil, which can increase the contact area between the heating element 133 and the water in the water tank 130, and improve the heating efficiency and heat preservation effect of the water tank 130.

[0112] Optionally, the heating element 133 is an electric heating element, and the water in the water tank 130 is heated by an electric heating method.

[0113] It should be noted that the water in the water tank 130 can be heated to the heat preservation state during off-peak power consumption, so as to ensure that the user can get hot water immediately when using bathroom water, and improve the experience of using bathroom water.

[0114] Further, please refer to again Figure 3 and Figure 4 The heating furnace 10 further includes a housing 160 ( Figure 3 A partial structural schematic diagram of the housing 160 is shown in

[0115] The heating furnace body 110 and the water tank assembly are both located inside the housing 160. Installing the heating furnace body 110 and the water tank assembly inside the housing 160 is convenient for the overall handling and installation of the heating furnace 10, and it is also more beautiful.

[0116] By means of the water tank heat preservation mode and the bathroom circulation pump 1402, the actual water temperature of the bathroom water outlet pipe 140 can be greater than or equal to its target outlet water temperature T0. By means of the water tank heat preservation mode for heat preservation, the effect of getting hot water immediately for bathroom use can be achieved, and it also avoids the influence on heating caused by the frequent switching between the heating and bathroom mode and the single heating mode of the bathroom water outlet pipe 140 during the heat preservation period during the heating period of the heating furnace 10. The water in the water tank 130 can also be heated to the heat preservation state during off-peak power consumption time, which better guarantees the realization of the function of getting hot water immediately.

[0117] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as falling within the scope described in this specification.

[0118] The above-described embodiments merely represent several implementation manners of the present application. The description thereof is relatively specific and detailed, but it should not 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 application, several modifications and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the appended claims.

Claims

1. A control method for a heating furnace, characterized in that, The heating furnace (10) includes a heating furnace body (110), a bathroom heat exchanger (120), a water tank (130), and a bathroom water outlet pipe (140) communicating with the water tank (130); The heating furnace body (110) has a heating water outlet pipe (111), and the heating water outlet pipe (111) includes a heating branch pipeline (113) and a bathroom branch pipeline (114) connected to the bathroom heat exchanger (120); the bathroom heat exchanger (120) is connected to the water tank (130) through a pipeline; The heating furnace (10) further includes a water inlet pipe (150) connected to the side of the bathroom heat exchanger (120) away from the water tank (130); The heating furnace body (110) further includes a heating water return pipe (112), a heating heat exchanger (115), and a combustion mechanism (116) connected to the water inlet pipe (150); The high-temperature flue gas generated by the combustion of the combustion mechanism (116) passes through the heating heat exchanger (115) and exchanges heat with the cold water flowing from the water inlet pipe (150) to the heating water return pipe (112); The hot water flowing into the bathroom branch pipeline (114) can exchange heat with the fluid flowing from the water inlet pipe (150) to the bathroom water outlet pipe (140) by means of the bathroom heat exchanger (120); The control method of the heating furnace (10) includes: When the heating furnace (10) is in the heating and bathroom mode, judge whether the actual water temperature of the bathroom water outlet pipe (140) is greater than or equal to a first preset temperature; if so, control the heating furnace (10) to switch from the heating and bathroom mode to the water tank heat preservation mode, so that the actual water temperature of the bathroom water outlet pipe (140) is not less than a second preset temperature; Wherein, when the heating furnace (10) is in the heating and bathroom mode, the heating water outlet pipe (111) is communicated with the bathroom branch pipeline (114); When the heating furnace (10) is in the water tank heat preservation mode, the heating water outlet pipe (111) is communicated with the heating branch pipeline (113); The second preset temperature is greater than or equal to the first preset temperature; After controlling the heating furnace (10) to switch from the heating and bathroom mode to the water tank heat preservation mode so that the actual water temperature of the bathroom water outlet pipe (140) is not less than the second preset temperature, the control method of the heating furnace (10) further includes: If the actual water temperature of the bathroom water outlet pipe (140) is less than or equal to a third preset temperature, control the heating furnace (10) to switch from the water tank heat preservation mode to the heating and bathroom mode; Wherein, the third preset temperature is less than the first preset temperature.

2. The control method for a heating furnace according to claim 1, characterized in that, After if the actual water temperature of the bathroom water outlet pipe (140) is less than or equal to the third preset temperature, control the heating furnace (10) to switch from the water tank heat preservation mode to the heating and bathroom mode, the control method of the heating furnace (10) further includes: Return to execute the step of judging whether the actual water temperature of the bathroom water outlet pipe (140) is greater than or equal to the first preset temperature.

3. The control method for a heating furnace according to claim 1, characterized in that, Before determining whether the actual water temperature of the sanitary outlet pipe (140) is greater than or equal to the first preset temperature when the heating furnace (10) is in the heating and sanitary mode, the control method of the heating furnace (10) further includes: Controlling the heating furnace (10) to operate in the water tank heat preservation mode; Judging whether the heating furnace (10) is in the sanitary water use mode for the first time; if so, controlling the heating furnace (10) to switch from the water tank heat preservation mode to the heating and sanitary mode.

4. The control method for a heating furnace according to claim 3, characterized in that, The control method of the heating furnace (10) further includes: If the heating furnace (10) is not in the sanitary water use mode for the first time, judge whether the operation time of the sanitary water use mode meets the first condition and whether the actual water temperature of the sanitary outlet pipe (140) meets the second condition; If the first condition and the second condition are met, perform the step of controlling the heating furnace (10) to switch from the water tank heat preservation mode to the heating and sanitary mode; Wherein, the first condition is that the operation time of the sanitary water use mode is greater than the critical time of sanitary water use, and the second condition is that the actual water temperature of the sanitary outlet pipe (140) is less than or equal to the lower limit temperature of heat preservation; The lower limit temperature of heat preservation is less than the third preset temperature.

5. The control method for a heating furnace according to claim 4, characterized in that, The control method of the heating furnace (10) further includes: If the first condition and / or the second condition are not met, control the heating furnace (10) to maintain the operation of the water tank heat preservation mode.

6. The control method for a heating furnace according to claim 1, characterized in that, The number of the water tanks (130) is two; controlling the heating furnace (10) to switch from the heating and sanitary mode to the water tank heat preservation mode so that the actual water temperature of the sanitary outlet pipe (140) is not less than the second preset temperature specifically includes: Heating the liquid in one of the water tanks (130), if after a preset time interval, the actual water temperature of the sanitary outlet pipe (140) is less than the second preset temperature, then heating the liquid in the other water tank (130) until the actual water temperature of the sanitary outlet pipe (140) is not less than the second preset temperature.

7. A heating furnace, characterized in that, Including a heating furnace body (110), a sanitary heat exchanger (120), a water tank (130) and a sanitary outlet pipe (140) communicated with the water tank (130); The heating furnace body (110) has a heating outlet pipe (111), and the heating outlet pipe (111) includes a heating branch pipe (113) and a sanitary branch pipe (114) connected to the sanitary heat exchanger (120); The sanitary heat exchanger (120) is connected to the water tank (130) through a pipeline; the heating furnace (10) further includes a control device, and the control device is configured to judge whether the actual water temperature of the sanitary outlet pipe (140) is greater than or equal to the first preset temperature when the heating furnace (10) is in the heating and sanitary mode; if so, control the heating furnace (10) to switch from the heating and sanitary mode to the water tank heat preservation mode so that the actual water temperature of the sanitary outlet pipe (140) is not less than the second preset temperature; Wherein, the heating furnace (10) further includes a water inlet pipe (150) connected to the side of the bathroom heat exchanger (120) away from the water tank (130); The heating furnace body (110) further includes a heating return pipe (112), a heating heat exchanger (115) and a combustion mechanism (116) connected to the water inlet pipe (150); The high-temperature flue gas generated by the combustion of the combustion mechanism (116) will pass through the heating heat exchanger (115) and exchange heat with the cold water flowing from the water inlet pipe (150) to the heating return pipe (112); The hot water flowing into the bathroom branch pipe (114) can exchange heat with the fluid flowing from the water inlet pipe (150) to the bathroom water outlet pipe (140) by means of the bathroom heat exchanger (120); When the heating furnace (10) is in the heating and bathroom mode, the heating water outlet pipe (111) is connected to the bathroom branch pipe (114); When the heating furnace (10) is in the water tank heat preservation mode, the heating water outlet pipe (111) is connected to the heating branch pipe (113); The second preset temperature is greater than or equal to the first preset temperature; The control device is configured to control the heating furnace (10) to switch from the water tank heat preservation mode to the heating and bathroom mode when the actual water temperature of the bathroom water outlet pipe (140) is less than or equal to a third preset temperature; Wherein, the third preset temperature is less than the first preset temperature.

8. The heating furnace according to claim 7, characterized in that, The heating water outlet pipe (111) includes a heating and bathroom switching valve (1111), and the heating and bathroom switching valve (1111) is arranged at the connection of the heating branch pipe (113) and the bathroom branch pipe (114).

9. The heating furnace according to claim 7, characterized in that, The water tank (130) includes a water tank body (131) and a water tank heat exchange pipe (132) arranged in the water tank body (131); Both ends of the water tank heat exchange pipe (132) are respectively communicated with the bathroom heat exchanger (120) and the bathroom water outlet pipe (140).

10. The heating furnace according to claim 9, characterized in that, The water tank heat exchange pipe (132) is configured to extend spirally from one end of the water tank body (131) to the other end of the water tank body (131) around the center line of the water tank body (131).

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