Heating water heating device and control method thereof

Abstract

The application discloses a heating and hot water equipment and a control method thereof, and relates to the technical field of fluid heating. The heating and hot water equipment comprises a heating loop, a first heat exchanger and a domestic water pipeline. The control method of the heating and hot water equipment comprises the following steps: in the case that a quick heating instruction is received, it is determined whether the heating and hot water equipment meets the entering condition or the exiting condition of the quick heating mode; in the case that it is determined that the heating and hot water equipment meets the entering condition of the quick heating mode, the heating loop is controlled to switch hot water to the first heat exchanger, so as to heat the domestic water pipeline. The technical scheme provided by the application can not only improve the heating response speed of domestic hot water, but also reduce the risk that the heating pipeline of the heating and hot water equipment is frozen due to the misjudgment of the environmental temperature in the non-heating season.

Description

Technical Field

[0001] This invention relates to the field of fluid heating technology, and in particular to a heating hot water device and its control method. Background Technology

[0002] Gas-fired wall-hung boilers, also known as gas-fired heating and hot water boilers according to national standards, are devices that simultaneously provide heating and domestic hot water. Their working principle involves transferring heat generated by combustion to water. Water acts as a heat carrier, transporting heat to the radiators of the heating system for heating, and simultaneously transferring heat to the tap water through plate or coaxial heat exchangers, thus providing domestic hot water at the required temperature. In gas-fired heating and hot water boilers without a zero-cold-water function, some systems employ a strategy to improve the heating response speed of domestic hot water: maintaining combustion to keep the primary water inside the boiler at a higher temperature. This way, when the user turns on the hot water tap, the system doesn't need to go through the process of heating the primary water from a cold state, thus shortening the waiting time for domestic hot water. However, activating this rapid heating mode may have some impact on the heating function. Because the primary water temperature is maintained at a relatively high level, the temperature sensor of the gas-fired heating water heater also detects this high temperature. In winter, if the user does not actively turn on the heating function, the control system of the gas-fired heating water heater may misjudge that the ambient temperature is sufficient and fail to activate the antifreeze protection measures, thereby increasing the risk of the heating pipes rupturing due to freezing at low temperatures. Summary of the Invention

[0003] The main objective of this invention is to propose a heating and hot water equipment and its control method, which aims to improve the heating response speed of domestic hot water and reduce the risk of the heating pipes of the heating and hot water equipment freezing due to misjudgment of ambient temperature during the non-heating season.

[0004] To achieve the above objectives, the present invention proposes a control method for a heating and hot water system, wherein the heating and hot water system includes a heating circuit, a first heat exchanger, and a domestic water pipeline, and the control method for the heating and hot water system includes:

[0005] Upon receiving a rapid heating command, determine whether the heating and hot water equipment meets the conditions for entering or exiting the rapid heating mode. Once it is determined that the heating hot water equipment meets the conditions for entering the rapid heating mode, the heating circuit is controlled to switch the hot water to the first heat exchanger to heat the domestic water pipeline.

[0006] In one embodiment, upon receiving a rapid heating command, determining whether the heating and hot water equipment meets the entry or exit conditions for rapid heating mode includes: Upon receiving a rapid heating command, and with the heating and hot water equipment currently operating in non-heating mode, the system acquires the water flow rate of the domestic water pipeline, the outlet temperature of the domestic water pipeline, and the target temperature of the domestic water. If the flow rate of the domestic water pipe is determined to be greater than the preset flow rate, determine whether the heating and hot water equipment meets the conditions for entering the rapid heating mode; or If the flow rate of the domestic water pipe is determined to be no greater than the preset flow rate, and the outlet water temperature of the domestic water pipe is less than the difference between the target domestic water temperature and the first preset temperature, then the heating and hot water equipment is determined to meet the entry conditions for the rapid heating mode; or If the water flow rate of the domestic water pipeline is determined to be no greater than the preset water flow rate, and the outlet water temperature of the domestic water pipeline is greater than the sum of the target domestic water temperature and the second preset temperature, then the heating and hot water equipment meets the exit conditions for the rapid heating mode.

[0007] In one embodiment, the control method for the heating and hot water equipment further includes: If the heating hot water equipment meets the exit conditions for the rapid heating mode, the control circuit stops switching the hot water to the first heat exchanger.

[0008] In one embodiment, the heating and hot water equipment further includes a heating circuit; upon receiving a rapid heating command, determining whether the heating and hot water equipment meets the entry or exit conditions for rapid heating mode further includes: Upon receiving a rapid heating command, if the current operating mode of the heating and hot water equipment is in heating mode and the outlet water temperature of the heating circuit is lower than the preset heating water temperature, the target temperature of domestic water, the target temperature of heating water, and the outlet water temperature of the domestic water pipeline are obtained. If the target domestic water temperature is less than the sum of the target heating water temperature and the third preset temperature, the target domestic water temperature is not greater than the preset domestic water temperature, and the outlet water temperature of the domestic water pipeline is less than the difference between the target domestic water temperature and the fourth preset temperature, then the heating and hot water equipment meets the conditions for entering the rapid heating mode; or If the target domestic water temperature is less than the sum of the target heating water temperature and the third preset temperature, the target domestic water temperature is greater than the preset domestic water temperature, and the outlet water temperature of the domestic water pipeline is less than the difference between the target domestic water temperature and the third preset temperature, then the heating and hot water equipment meets the conditions for entering the rapid heating mode; or Under the condition that the target temperature of domestic water is not less than the sum of the target temperature of heating water and the third preset temperature, and the outlet temperature of domestic water is less than the difference between the target temperature of heating water and the first preset temperature, the heating and hot water equipment is determined to meet the entry conditions for the rapid heating mode; or If the outlet water temperature of the domestic water pipeline is determined to be greater than the sum of the target domestic water temperature and the second preset temperature, the heating and hot water equipment is determined to meet the exit conditions of the rapid heating mode.

[0009] In one embodiment, the heating and hot water equipment further includes a water pump disposed in the heating circuit; the control method of the heating and hot water equipment further includes: If the heating and hot water equipment meets the exit conditions for the rapid heating mode, control the heating circuit to switch the hot water to the heating circuit, and control the heating circuit to circulate the hot water. Obtain the outlet water temperature of the heating circuit; If the outlet water temperature of the heating circuit is determined to be greater than the sum of the target heating water temperature and the fifth preset temperature, the heating circuit is controlled to stop heating and the water pump is controlled to run until the outlet water temperature of the heating circuit is less than the difference between the target heating water temperature and the fifth preset temperature, at which point the heating circuit is controlled to start heating.

[0010] In one embodiment, the heating and hot water equipment further includes a heating circuit; upon receiving a rapid heating command, determining whether the heating and hot water equipment meets the entry or exit conditions for rapid heating mode further includes: Upon receiving a rapid heating command, if the current working mode of the heating and hot water equipment is in heating mode and the outlet water temperature of the heating circuit is not lower than the preset heating water temperature, the target temperature of domestic water, the target temperature of heating water, and the outlet water temperature of the domestic water pipeline are obtained. If the target domestic water temperature is less than the target heating water temperature and the third preset temperature, the target domestic water temperature is not greater than the preset domestic water temperature, and the outlet water temperature of the domestic water pipeline is less than the difference between the target domestic water temperature and the fourth preset temperature, then the heating and hot water equipment meets the conditions for entering the rapid heating mode; or If the target domestic water temperature is less than the target heating water temperature and the third preset temperature, the target domestic water temperature is greater than the preset domestic water temperature, and the outlet water temperature of the domestic water pipeline is less than the difference between the target domestic water temperature and the fifth preset temperature, then the heating and hot water equipment meets the conditions for entering the rapid heating mode; or If the target temperature of domestic water is not less than the target temperature of heating water and the third preset temperature, and the outlet temperature of domestic water is less than the difference between the target temperature of heating water and the first preset temperature, then the heating and hot water equipment meets the conditions for entering the rapid heating mode; or If the outlet water temperature of the domestic water pipeline is determined to be greater than the sum of the target domestic water temperature and the second preset temperature, the heating and hot water equipment is determined to meet the exit conditions of the rapid heating mode.

[0011] In one embodiment, the heating and hot water equipment further includes a water pump disposed in the heating circuit; the control method of the heating and hot water equipment further includes: If the heating hot water equipment meets the exit conditions of the rapid heating mode, control the heating circuit to stop switching hot water to the first heat exchanger, and control the water pump to circulate for a first preset time and stop running for a second preset time. Obtain the outlet water temperature of the heating circuit; If the outlet water temperature of the heating circuit is less than the difference between the target heating water temperature and the fifth preset temperature, the heating circuit is controlled to switch hot water to the heating circuit, and the heating circuit is controlled to circulate hot water.

[0012] In one embodiment, the heating and hot water equipment further includes a heating circuit, which includes an indoor thermostat; upon receiving a rapid heating command, determining whether the heating and hot water equipment meets the entry or exit conditions for rapid heating mode further includes: Upon receiving a rapid heating command, if the heating and hot water equipment is currently in heating mode and the indoor thermostat is off, the target temperature of the domestic water, the target temperature of the heating water, and the outlet temperature of the domestic water pipe are obtained. If the outlet water temperature of the domestic water pipeline is determined to be less than the difference between the target domestic water temperature and the first preset temperature, then the heating and hot water equipment is determined to meet the entry conditions for the rapid heating mode; or If the outlet water temperature of the domestic water pipeline is determined to be greater than the sum of the target domestic water temperature and the second preset temperature, the heating and hot water equipment is determined to meet the exit conditions of the rapid heating mode.

[0013] In one embodiment, the heating and hot water equipment further includes a water pump disposed in the heating circuit; the control method of the heating and hot water equipment further includes: Once it is determined that the heating and hot water equipment meets the exit conditions for the rapid heating mode, the water pump is controlled to stop running; With the indoor thermostat closed, the heating circuit is switched to hot water, and the heating circuit is circulated with hot water.

[0014] In one embodiment, the heating and hot water equipment further includes a heating circuit; the control method for the heating and hot water equipment further includes: If it is determined that there is a risk of freezing in the heating circuit and the domestic water pipe has been continuously heated for the third preset time, the heating circuit is controlled to switch hot water to the heating circuit, and the heating circuit is controlled to circulate hot water. When the duration of hot water circulation in the heating circuit reaches the fourth preset duration, an antifreeze test is performed on the heating circuit.

[0015] In one embodiment, determining that the heating circuit has a risk of icing includes: Obtain the current operating mode of the heating and hot water equipment, as well as the inlet water temperature of the domestic water pipes and / or the local weather forecast temperature; If the heating and hot water equipment is currently in non-heating mode, and the inlet water temperature of the domestic water pipe is lower than the preset inlet water temperature and / or the local weather forecast temperature is lower than the preset weather forecast temperature, it is determined that there is a risk of freezing in the heating circuit.

[0016] In one embodiment, the heating and hot water equipment further includes a water pump disposed in the heating circuit; the control method of the heating and hot water equipment further includes: Control the water pump to run for a fifth preset time and obtain the temperature of the heating circuit; If the heating circuit temperature is lower than the preset temperature within the fifth preset time period, it is determined that the heating circuit has frozen.

[0017] The present invention also proposes a heating and hot water device, including a processor and a memory, wherein the memory stores a control program for the heating and hot water device, and when the processor executes the control program for the heating and hot water device, the control method for the heating and hot water device described above is implemented.

[0018] In one embodiment, the heating and hot water equipment further includes heating pipes, a first heat exchanger, domestic water pipes, and heating pipes; wherein, The domestic water pipeline has a domestic water inlet and a domestic water outlet. The first heat exchanger has a first heat exchange channel and a second heat exchange channel. The first heat exchange channel connects the domestic water inlet and the domestic water outlet. The second heat exchange channel is connected in parallel with the heating pipeline to form a heating circuit. The heating pipeline is connected in parallel with the heating pipeline to form a heating circuit.

[0019] In one embodiment, the heating and hot water equipment is a gas-fired wall-mounted boiler.

[0020] The technical solution of this invention involves setting up a heating circuit, a first heat exchanger, and domestic water pipes in a heating and hot water equipment. Upon receiving a rapid heating command, the system determines whether the heating and hot water equipment meets the entry or exit conditions for rapid heating mode. When the entry conditions for rapid heating mode are met, the heating circuit is controlled to switch the hot water to the first heat exchanger to heat the domestic water pipes. This control logic allows the heating and hot water equipment to respond to users' demands for rapid domestic hot water while avoiding the primary side water temperature remaining high for an extended period, thus preventing it from affecting the judgment of ambient temperature conditions. Since the activation and deactivation of rapid heating mode are based on explicit condition determination, rather than continuously maintaining a high temperature, it helps reduce the possibility that the heating and hot water equipment may fail to identify low-temperature risks in time due to excessively high primary side water temperature, and reduces the risk of the heating pipes freezing because the antifreeze protection is not triggered when the heating function is not actively activated. Compared to traditional rapid heating strategies where the continuous high temperature of the primary side water may mask the actual low temperature conditions of the environment, this solution improves the response speed of domestic hot water through conditional rapid heating control, while preserving the judgment basis for the normal activation of the antifreeze protection mechanism, which is conducive to the safe operation of heating and hot water equipment in non-heating use scenarios in winter. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of a structure of an embodiment of the heating and hot water equipment provided by the present invention; Figure 2 A flowchart of the first embodiment of the control method for a heating and hot water equipment provided by the present invention; Figure 3 A flowchart of the second embodiment of the control method for a heating and hot water equipment provided by the present invention; Figure 4 A flowchart of the third embodiment of the control method for heating and hot water equipment provided by the present invention; Figure 5 A flowchart of the fourth embodiment of the control method for heating and hot water equipment provided by the present invention; Figure 6 A flowchart of the fifth embodiment of the control method for heating and hot water equipment provided by the present invention; Figure 7 A flowchart of the sixth embodiment of the control method for heating and hot water equipment provided by the present invention; Figure 8A flowchart of the seventh embodiment of the control method for heating and hot water equipment provided by the present invention; Figure 9 A flowchart of the eighth embodiment of the control method for heating and hot water equipment provided by the present invention; Figure 10 A flowchart of the ninth embodiment of the control method for heating and hot water equipment provided by the present invention; Figure 11 A flowchart of the tenth embodiment of the control method for heating and hot water equipment provided by the present invention; Figure 12 A flowchart of the eleventh embodiment of the control method for heating and hot water equipment provided by the present invention; Figure 13 A flowchart of the twelfth embodiment of the control method for heating and hot water equipment provided by the present invention.

[0023] Explanation of icon numbers: 100. Heating and hot water equipment; 10. Heating circuit; 11. Heating pipeline; 111. First inlet pipeline; 112. First outlet pipeline; 113. Second heat exchanger; 20. First heat exchanger; 201. First heat exchange channel; 202. Second heat exchange channel; 30. Domestic water pipeline; 301. Domestic water inlet; 302. Domestic water outlet; 31. Second inlet pipeline; 32. Second outlet pipeline; 40. Heating circuit; 41. Heating pipeline; 50. First temperature sensor; 60. Second temperature sensor; 70. Water flow sensor; 80. Water pump; 90. Three-way valve.

[0024] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0026] This invention proposes a control method for a heating and hot water equipment 100.

[0027] It is understood that the heating and hot water equipment 100 is a thermal energy device capable of simultaneously providing heating and domestic hot water. The heating and hot water equipment 100 can be a gas-fired wall-hung boiler, or other devices with similar integrated heating functions, such as an electrically driven heat pump type integrated heating and hot water unit or a condensing gas-fired hot water unit. This invention is primarily described using a gas-fired wall-hung boiler as an example.

[0028] A gas-fired wall-hung boiler, also known as a gas-fired heating and hot water boiler according to national standards, is a device that simultaneously provides heating and domestic hot water. Its working principle involves transferring heat generated by combustion to water. Water acts as a heat energy carrier, transporting heat to the radiators of the heating system to provide warmth, and simultaneously transferring heat to the tap water through plate or coaxial heat exchangers, thus providing domestic hot water at the required temperature.

[0029] In gas-fired heating and hot water boilers that do not have a zero-cold-water function, some boilers employ a strategy to improve the heating response speed of domestic hot water: maintaining combustion to keep the primary water inside the boiler at a high temperature. This way, when a user turns on the hot water tap, the boiler does not need to go through the process of heating the primary water from a cold state, thus shortening the waiting time for domestic hot water.

[0030] However, activating this rapid heating mode may have some impact on the heating function. Since the primary water temperature is maintained at a relatively high level, the temperature sensor of the gas-fired heating water heater also detects this high temperature. In winter, if the user does not actively turn on the heating function, the control system of the gas-fired heating water heater may misjudge that the ambient temperature is sufficient and fail to activate the antifreeze protection measures, thereby increasing the risk of the heating pipe 41 rupturing due to freezing at low temperatures.

[0031] like Figure 1As shown, in one embodiment of the present invention, the heating and hot water equipment 100 includes a burner, a heating pipe 11, a first heat exchanger 20, a domestic water pipe 30, and a heating pipe 41. The heating and hot water equipment 100 also includes a combustion chamber, in which the burner is disposed. The combustion chamber is located on one side of the second heat exchanger 113, ensuring that the high-temperature flue gas generated by combustion can efficiently flow through the second heat exchanger 113 to complete heat exchange. The heating pipe 11 includes a first inlet pipe 111, a first outlet pipe 112, and a second heat exchanger 113 connecting the first inlet pipe 111 and the first outlet pipe 112. The second heat exchanger 113 receives the heat from the flue gas generated by the burner combustion and transfers the heat to the water flowing through it. The domestic water pipe 30 includes a second inlet pipe 31 and a second outlet pipe 32, and has a domestic water inlet 301 and a domestic water outlet 302. The first heat exchanger 20 is provided with a first heat exchange channel 201 and a second heat exchange channel 202. A second inlet pipe 31 connects the domestic water inlet 301 and the inlet end of the first heat exchange channel 201, and a second outlet pipe 32 connects the outlet end of the first heat exchange channel 201 and the domestic water outlet 302. The second heat exchange channel 202 is connected in parallel with the heating pipe 11 to form a heating circuit 10, so that the hot water heated by the second heat exchanger 113 can selectively flow through the second heat exchange channel 202 to transfer heat to the tap water in the first heat exchange channel 201. The heating pipe 11 is connected in parallel with the heating pipe 41 to form a heating circuit 40, so that the hot water heated by the second heat exchanger 113 can also selectively enter the heating pipe 41 for heat transfer, so as to provide continuous and stable heat energy to the indoor heat dissipation terminals.

[0032] Among them, the heating and hot water equipment 100 has a quick heating mode and a regular heating mode: In rapid heating mode, the second heat exchange channel 202 is connected to the heating pipe 11. The high-temperature flue gas generated by the burner combustion is transferred to the second heat exchanger 113 and exchanges heat with the second heat exchanger 113. After the water is heated in the second heat exchanger 113, it is conducted to the second heat exchange channel 202 through the first water inlet pipe 111 and the first water outlet pipe 112. Then, the tap water in the first heat exchange channel 201 is heated through heat conduction, so as to quickly provide domestic hot water at the required temperature when the user turns on the hot water tap.

[0033] In heating mode, heating pipe 11 is connected to heating pipe 41. The high-temperature flue gas generated by the burner is transferred to the second heat exchanger 113 and exchanges heat with the second heat exchanger 113. After the water is heated in the second heat exchanger 113, it enters the heating pipe 41 through the first water inlet pipe 111 and the first water outlet pipe 112, so that the heat circulates in the heating circuit 40 and continuously releases heat energy to the indoor heat dissipation terminal to achieve heating.

[0034] Based on the above hardware structure, such as Figure 1 and Figure 2 As shown, in one embodiment of the present invention, the control method of the heating and hot water equipment 100 includes: S100. Upon receiving a rapid heating command, determine whether the heating and hot water equipment meets the entry or exit conditions for rapid heating mode. S200: When it is determined that the heating hot water equipment meets the conditions for entering the rapid heating mode, the heating circuit is controlled to switch the hot water to the first heat exchanger to heat the domestic water pipeline.

[0035] Understandably, during warmer seasons, such as late spring or early autumn, users typically don't need to use the heating and hot water system 100 because the ambient temperature is high, requiring neither indoor heating nor much attention to the immediate supply temperature of domestic hot water. Conversely, during colder seasons, such as deep winter or early spring, users do need to use the heating and hot water system 100 because they not only need to maintain a comfortable indoor temperature through the heating circuit 40 but also frequently use domestic hot water. In extremely low ambient temperatures, such as when the outdoor temperature drops below freezing at night, the heating circuit 40, being in non-heating mode for extended periods and lacking heat replenishment, is often at risk of freezing. Once the heating circuit 40 freezes, it can easily cause the heating pipes 41 to expand, deform, or even rupture, leading to damage or leaks in the heating and hot water system 100.

[0036] Therefore, upon receiving a rapid heating command, the heating and hot water equipment 100 first determines whether it meets the entry or exit conditions for the rapid heating mode. This determination process can be based on a comprehensive evaluation of information such as the internal water temperature of the heating and hot water equipment 100, the ambient temperature, or the user's operating status. When it is determined that the entry conditions for the rapid heating mode are met, the heating and hot water equipment 100 controls the heating circuit 10 to switch the hot water to the first heat exchanger 20. The hot water, heated by the second heat exchanger 113, flows through the second heat exchange channel 202 of the first heat exchanger 20, transferring heat to the first heat exchange channel 201 of the first heat exchanger 20, thereby heating the tap water in the domestic water pipe 30 to achieve a rapid supply of domestic hot water. This control method allows the heating and hot water equipment 100 to prioritize responding to rapid heating commands in scenarios where the user has not activated the heating function but has a demand for domestic hot water, while avoiding the primary water temperature from remaining at a high level for a long time, which would interfere with the identification of low-temperature environments.

[0037] Since the operation of the rapid heating mode relies on dynamic judgment of entry and exit conditions, rather than maintaining a continuous high temperature, the heating and hot water equipment 100 retains the ability to sense the risk of low ambient temperature during the rapid heating process. After the rapid heating mode has been running for a period of time, if the external environment is indeed in a low-temperature state, the heating and hot water equipment 100 can determine whether antifreeze measures need to be implemented through subsequent logic. The above-mentioned condition-based control method helps to provide the necessary operating window for the antifreeze protection of the heating circuit 40 while meeting the demand for rapid domestic hot water supply, thereby reducing the possibility of the heating pipe 41 freezing due to misjudgment of the ambient temperature.

[0038] Thus, the heating and hot water equipment 100 of the present invention, upon receiving a rapid heating command, controls the heating circuit 10 to direct hot water to the first heat exchanger 20 to heat the domestic water pipeline 30 according to the entry or exit conditions of the rapid heating mode. This not only improves the response speed of domestic hot water but also avoids the problem of antifreeze failure caused by the primary side water temperature being continuously too high and masking the true low temperature environment. This enhances the operational safety and reliability of the heating and hot water equipment 100 in the non-heating use state during winter.

[0039] like Figure 1 and Figure 3 As shown, in one embodiment of the present invention, step S100 includes: S110. Upon receiving a rapid heating command, and with the current operating mode of the heating and hot water equipment in non-heating mode, obtain the water flow rate of the domestic water pipeline, the outlet temperature of the domestic water pipeline, and the target temperature of the domestic water. S120A, If the flow rate of the domestic water pipe is determined to be greater than the preset flow rate, determine whether the heating and hot water equipment meets the conditions for entering the rapid heating mode; or S120B: If the water flow rate in the domestic water pipeline is determined to be no greater than the preset water flow rate, and the outlet water temperature in the domestic water pipeline is less than the difference between the target domestic water temperature and the first preset temperature, then the heating and hot water equipment is determined to meet the entry conditions for the rapid heating mode; or S120C. If the water flow rate of the domestic water pipeline is not greater than the preset water flow rate, and the outlet water temperature of the domestic water pipeline is greater than the sum of the target domestic water temperature and the second preset temperature, the heating and hot water equipment is determined to meet the exit conditions of the rapid heating mode.

[0040] In this embodiment, when the heating and hot water equipment 100 receives a rapid heating command, it first checks whether it is currently in a non-heating mode, and simultaneously acquires the water flow rate, outlet water temperature, and user-set target domestic water temperature of the domestic water pipe 30. A water flow detection device 70 can be installed in the second inlet pipe 31 of the domestic water pipe 30 to detect the water flow rate flowing through the second inlet pipe 31.

[0041] If the water flow rate of the domestic water pipe 30 is detected to be greater than the preset water flow rate, it indicates that the user is using a large flow of hot water. At this time, the hot water in the heating circuit 10 is directed to the first heat exchanger 20 to quickly meet the hot water demand.

[0042] If the water flow rate is not greater than the preset water flow rate but the outlet water temperature is less than the difference between the target domestic water temperature and the first preset temperature, it indicates that the current water temperature is too low and still needs to be heated by the first heat exchanger 20. Although the user may not actually use water at this time, maintaining the primary side water temperature in advance can shorten the waiting time for water to come out when the hot water tap is turned on later, thus improving the convenience of use.

[0043] When the water flow rate is no greater than the preset water flow rate and the outlet water temperature is greater than the sum of the target domestic water temperature and the second preset temperature, it indicates that the current water temperature is sufficient or even too high. Continuing to supply high-temperature hot water to the first heat exchanger 20 may lead to energy waste or discomfort due to excessively high outlet water temperature. Therefore, the heating and hot water equipment 100 stops switching hot water to the first heat exchanger 20 and ends the operation of the rapid heating mode, so that the heating circuit 10 no longer continuously supplies high-temperature hot water to the first heat exchanger 20, thereby avoiding unnecessary heat energy consumption and reducing the possibility of affecting the judgment of low-temperature environmental conditions due to the long-term high primary water temperature.

[0044] like Figure 1 and Figure 4 As shown, in one embodiment of the present invention, the control method for the heating and hot water equipment 100 further includes: S300: If the heating hot water equipment meets the exit conditions of the rapid heating mode, control the heating circuit to stop switching hot water to the first heat exchanger.

[0045] In this embodiment, the control step enables the heating and hot water equipment 100 to promptly terminate the operation of supplying hot water from the heating circuit 10 to the first heat exchanger 20 when it determines that the conditions for exiting the rapid heating mode are met. By stopping the hot water switching, the heating and hot water equipment 100 avoids continuing to heat the domestic water pipe 30 when the demand for domestic hot water decreases or the outlet water temperature is already at a high level. This helps prevent the primary water temperature from remaining high for a long time, thereby preserving the ability to sense low ambient temperatures and reducing the possibility of subsequent antifreeze judgment being affected by water temperature signal distortion.

[0046] like Figure 1 and Figure 5 As shown, in one embodiment of the present invention, the heating and hot water equipment 100 further includes a heating circuit 40; step S100 further includes: S130. Upon receiving the rapid heating command, if the current working mode of the heating and hot water equipment is in heating mode and the outlet water temperature of the heating circuit is lower than the preset heating water temperature, obtain the target temperature of domestic water, the target temperature of heating water, and the outlet water temperature of the domestic water pipeline. S140A, under the following conditions: the target domestic water temperature is less than the sum of the target heating water temperature and the third preset temperature; the target domestic water temperature is not greater than the preset domestic water temperature; and the outlet water temperature of the domestic water pipeline is less than the difference between the target domestic water temperature and the fourth preset temperature, the heating and hot water equipment is determined to meet the entry conditions for the rapid heating mode; or S140B, under the following conditions: the target domestic water temperature is less than the sum of the target heating water temperature and the third preset temperature; the target domestic water temperature is greater than the preset domestic water temperature; and the outlet water temperature of the domestic water pipeline is less than the difference between the target domestic water temperature and the third preset temperature, the heating and hot water equipment is determined to meet the entry conditions for the rapid heating mode; or S140C, under the condition that the target temperature of domestic water is not less than the sum of the target temperature of heating water and the third preset temperature, and the outlet temperature of domestic water is less than the difference between the target temperature of heating water and the first preset temperature, the heating and hot water equipment is determined to meet the entry conditions for the rapid heating mode; or S140D: If the outlet water temperature of the domestic water pipeline is greater than the sum of the target domestic water temperature and the second preset temperature, determine that the heating and hot water equipment meets the exit conditions for the rapid heating mode.

[0047] In this embodiment, the target temperature for domestic water is used to guide the temperature setting during the domestic hot water heating process to ensure that the domestic hot water temperature meets the user's expectations; the target temperature for heating water is used to maintain the internal circulating water temperature of the heating circuit 40 to ensure the indoor heating effect.

[0048] When the heating and hot water equipment 100 receives a rapid heating command and is in heating mode, if the outlet water temperature of the heating circuit 40 is detected to be lower than the preset heating water temperature, it indicates that although the heating and hot water equipment 100 is providing heating, it is not fully meeting the preset heating demand. Specifically, the high-temperature flue gas generated by the heating pipe 11, when transmitted to the heating pipe 41, has failed to bring the heating water to the required temperature. In this case, to enter rapid heating mode, further analysis of domestic hot water demand is necessary. This is because even in heating mode, the user's immediate domestic hot water demand must be met to avoid affecting the user experience.

[0049] The heating and hot water equipment 100 compares the target temperature of domestic water with the target temperature of heating water, and combines this with the actual outlet temperature of domestic water pipe 30 to decide whether to direct the hot water in the heating circuit 10 to the first heat exchanger 20.

[0050] If the target temperature of domestic water is less than the target temperature of heating water plus the third preset temperature, the target temperature of domestic water is not greater than the preset domestic water temperature, and the current outlet temperature of domestic water pipe 30 is also less than the target temperature of domestic water minus the fourth preset temperature, it indicates that the demand for domestic hot water is low at this time, but the water temperature still needs to be increased to approach the user's expectations. Based on this, the heating and hot water equipment 100 determines that the conditions for entering the rapid heating mode are met, and controls the heating circuit 10 to switch the hot water to the first heat exchanger 20 to heat the domestic water pipe 30.

[0051] Alternatively, if the target temperature of domestic water is less than the target temperature of heating water plus the third preset temperature, but the target temperature of domestic water is greater than the preset domestic water temperature, and the outlet temperature of domestic water pipe 30 is also less than the target temperature of domestic water minus the third preset temperature, it indicates that although the target temperature of domestic water is high, it still needs to be adjusted to meet the user's need for quick access to hot water at a suitable temperature. Based on this, the heating and hot water equipment 100 determines that the conditions for entering the rapid heating mode are met, and controls the heating circuit 10 to switch the hot water to the first heat exchanger 20 to heat the domestic water pipe 30.

[0052] Alternatively, if the target temperature of domestic water is not less than the target temperature of heating water plus the third preset temperature, and the outlet temperature of domestic water pipe 30 is less than the target temperature of heating water minus the first preset temperature, it indicates that the current domestic hot water temperature is far below the user's expectations and urgently needs to be increased through the first heat exchanger 20. Based on this, the heating and hot water equipment 100 determines that the conditions for entering the rapid heating mode are met and controls the heating circuit 10 to switch the hot water to the first heat exchanger 20 to heat the domestic water pipe 30.

[0053] Regardless of the scenario, the aforementioned control strategies aim to ensure a rapid response to and fulfillment of users' domestic hot water needs without compromising heating performance, thereby optimizing the user experience and maintaining 100% efficient operation of the heating and hot water equipment. This ensures a continuous and stable supply of heating while flexibly addressing users' immediate domestic hot water demands.

[0054] Alternatively, if the outlet water temperature of the domestic water pipe 30 is greater than the sum of the domestic water target temperature and the second preset temperature, it indicates that the domestic hot water temperature is significantly higher than the target value set by the user. Continuing to supply hot water to the first heat exchanger 20 may result in overheating of the outlet water or waste of energy. Based on this, the heating and hot water equipment 100 determines that the exit conditions of the rapid heating mode are met and controls the heating circuit 10 to stop switching hot water to the first heat exchanger 20.

[0055] like Figure 1 and Figure 6 As shown, in one embodiment of the present invention, the heating and hot water equipment 100 further includes a water pump 80 disposed in the heating circuit 40; the control method of the heating and hot water equipment 100 further includes: S400: When it is determined that the heating and hot water equipment meets the exit conditions of the rapid heating mode, control the heating circuit to switch the hot water to the heating circuit, and control the heating circuit to circulate the hot water. S500: Obtain the outlet water temperature of the heating circuit; S600: When it is determined that the outlet water temperature of the heating circuit is greater than the sum of the target heating water temperature and the fifth preset temperature, control the heating circuit to stop heating and control the water pump to run until the outlet water temperature of the heating circuit is less than the difference between the target heating water temperature and the fifth preset temperature, then control the heating circuit to start heating.

[0056] In this embodiment, when the target temperature of domestic water is not less than the sum of the target temperature of heating water and the second preset temperature, it indicates that the current domestic hot water demand has been met or is nearly met. At this time, the heating and hot water equipment 100 will switch its operating mode, switching the heating pipe 11 from the first heat exchanger 20 to the heating pipe 41 through a device such as a three-way valve 90, prioritizing the indoor heating demand. Once switched to heating mode, the heating and hot water equipment 100 can monitor the outlet water temperature of the heating circuit 40 through the second temperature detection element 60 installed in the first inlet pipe 111 and / or the first outlet pipe 112.

[0057] If the outlet water temperature of heating circuit 40 exceeds the sum of the target heating water temperature and the fifth preset temperature, it indicates that the water temperature in heating circuit 40 has exceeded the user's desired comfort range, potentially leading to overheating. Therefore, the heating and hot water equipment 100 will temporarily stop the heating process but continue to run the water pump 80 to maintain a uniform water temperature distribution within heating circuit 40. This approach avoids energy waste and potential safety risks caused by overheating. Only when the outlet water temperature of heating circuit 40 drops below the difference between the target heating water temperature and the fifth preset temperature, indicating that the water temperature in heating circuit 40 has fallen back to a level requiring reheating, will the heating and hot water equipment 100 restart the heating process. This involves controlling the burner to start, generating high-temperature flue gas that is then transferred to the second heat exchanger 113. This ensures that heating circuit 40 maintains a comfortable room temperature while also considering energy efficiency management. This design not only allows for rapid response to users' domestic hot water needs but also ensures the efficient and safe operation of the heating and hot water equipment 100 under different usage scenarios, enhancing the overall user experience. This method ensures that even after switching back to heating mode from rapid heating mode, the heating and hot water equipment 100 can effectively balance the supply of domestic hot water and the demand for indoor heating, while also taking into account energy saving and safety.

[0058] like Figure 1 and Figure 7 As shown, in one embodiment of the present invention, the heating and hot water equipment 100 further includes a heating circuit 40; step S100 further includes: S150. Upon receiving the rapid heating command, if the current working mode of the heating and hot water equipment is in heating mode and the outlet water temperature of the heating circuit is not less than the preset heating water temperature, obtain the target temperature of domestic water, the target temperature of heating water, and the outlet water temperature of the domestic water pipeline. S160A, under the following conditions: the target domestic water temperature is less than the target heating water temperature and the third preset temperature; the target domestic water temperature is not greater than the preset domestic water temperature; and the outlet water temperature of the domestic water pipeline is less than the difference between the target domestic water temperature and the fourth preset temperature, the heating and hot water equipment is determined to meet the entry conditions for the rapid heating mode; or S160B, If the target domestic water temperature is less than the target heating water temperature and the third preset temperature, the target domestic water temperature is greater than the preset domestic water temperature, and the outlet water temperature of the domestic water pipeline is less than the difference between the target domestic water temperature and the fifth preset temperature, then the heating and hot water equipment meets the entry conditions for the rapid heating mode; or S160C, If the target temperature of domestic water is not less than the target temperature of heating water and the third preset temperature, and the outlet temperature of domestic water is less than the difference between the target temperature of heating water and the first preset temperature, then the heating and hot water equipment meets the entry conditions for the rapid heating mode; or S160D: If the outlet water temperature of the domestic water pipeline is greater than the sum of the target domestic water temperature and the second preset temperature, determine that the heating and hot water equipment meets the exit conditions for the rapid heating mode.

[0059] In this embodiment, when the heating and hot water equipment 100 receives a rapid heating command and is in heating mode providing heating, if the outlet water temperature of the heating circuit 40 is detected to be not lower than the preset heating water temperature, it indicates that the heating demand has been basically met. The burner may be in a paused heating state, but there is still hot water at a higher temperature in the heating circuit 40. In this case, if the user simultaneously requests a rapid demand for domestic hot water, the heating and hot water equipment 100 needs to determine whether it can utilize existing heat energy to prioritize the domestic hot water demand without affecting the already achieved heating effect.

[0060] By comparing the target temperature of domestic water with the target temperature of heating water, and combining this with the actual outlet temperature of domestic water pipe 30, the heating and hot water equipment 100 can decide whether to direct the hot water in heating pipe 11 to the first heat exchanger 20.

[0061] If the target temperature of domestic water is less than the target temperature of heating water and the third preset temperature, the target temperature of domestic water is not greater than the preset domestic water temperature, and the outlet temperature of domestic water pipe 30 is less than the difference between the target temperature of domestic water and the fourth preset temperature, it indicates that the current domestic hot water temperature is too low and the user's expected target temperature of domestic water does not exceed the preset domestic water temperature. Based on this, the heating and hot water equipment 100 determines that the conditions for entering the rapid heating mode are met, and controls the heating circuit 10 to switch the hot water to the first heat exchanger 20 to heat the domestic water pipe 30.

[0062] Alternatively, if the target domestic water temperature is lower than the target heating water temperature and the third preset temperature, the target domestic water temperature is higher than the preset domestic water temperature, or the outlet water temperature of the domestic water pipe 30 is lower than the difference between the target domestic water temperature and the fifth preset temperature, it indicates that although the user expects a higher target domestic water temperature, the current actual water temperature is still significantly insufficient. Based on this, the heating and hot water equipment 100 determines that the conditions for entering the rapid heating mode are met, and controls the heating circuit 10 to switch the hot water to the first heat exchanger 20 to heat the domestic water pipe 30, thereby increasing the domestic hot water temperature by utilizing the existing heat energy in the heating circuit 40 without restarting the combustion process.

[0063] Alternatively, if the target temperature of domestic water is not less than the target temperature of heating water and the third preset temperature, and the outlet temperature of domestic water pipe 30 is less than the difference between the target temperature of heating water and the first preset temperature, it indicates that the demand for domestic hot water is close to or exceeds the current heating water temperature level, while the actual outlet temperature is significantly lower. Based on this, the heating and hot water equipment 100 determines that the conditions for entering the rapid heating mode are met, and controls the heating circuit 10 to switch the hot water to the first heat exchanger 20 to heat the domestic water pipe 30, so as to quickly increase the domestic hot water temperature by using the heat stored in the heating circuit 40.

[0064] Regardless of the scenario, the aforementioned control strategy can both avoid energy waste caused by repeatedly starting combustion when heating has reached the standard and ensure that thermal energy resources can be promptly mobilized to meet the domestic hot water demand when users need them, thereby improving the responsiveness and comfort of hot water use while maintaining heating.

[0065] Alternatively, if the outlet water temperature of the domestic water pipe 30 is greater than the sum of the domestic water target temperature and the second preset temperature, it indicates that the actual temperature of the domestic hot water is significantly higher than the domestic water target temperature set by the user. Continuing to supply hot water to the first heat exchanger 20 may result in overheating of the outlet water or unnecessary heat energy consumption. Based on this, the heating and hot water equipment 100 determines that the exit conditions of the rapid heating mode are met and controls the heating circuit 10 to stop switching hot water to the first heat exchanger 20.

[0066] like Figure 1 and Figure 8As shown, in one embodiment of the present invention, the heating and hot water equipment 100 further includes a water pump 80 disposed in the heating circuit 40; the control method of the heating and hot water equipment 100 further includes: S700: When it is determined that the heating hot water equipment meets the exit conditions of the rapid heating mode, the heating circuit is controlled to stop switching hot water to the first heat exchanger, and the water pump is controlled to circulate for a first preset time and then stop for a second preset time. S800: Obtain the outlet water temperature of the heating circuit; S900 If the outlet water temperature of the heating circuit is less than the difference between the target heating water temperature and the fifth preset temperature, the heating circuit is controlled to switch the hot water to the heating circuit, and the heating circuit is controlled to circulate the hot water.

[0067] In this embodiment, when the outlet water temperature of the domestic water pipe 30 reaches or exceeds the sum of the target domestic water temperature and the second preset temperature, it indicates that the current domestic hot water demand has been met or even slightly exceeded. At this time, in order to avoid unnecessary energy consumption and prevent the inconvenience or risk caused by overheating, the heating and hot water equipment 100 will stop guiding the hot water in the heating pipe 11 to the first heat exchanger 20 and start the water pump 80 to run in a cyclical manner for a first preset time, and then stop running for a second preset time. The above-mentioned intermittent cyclical operation not only helps to evenly distribute the water temperature in the heating circuit 40, but also serves as a basis for determining whether the heating function needs to be restarted.

[0068] The outlet water temperature of the heating circuit 40 can be monitored by a second temperature sensor 60 installed in the first inlet pipe 111 and / or the first outlet pipe 112 to assess whether the current heating status meets the user's comfort requirements. If the outlet water temperature of the heating circuit 40 is less than the difference between the target heating water temperature and the fifth preset temperature, it indicates that the heating demand is not fully met. The heating and hot water equipment 100 will switch the hot water flow direction of the heating pipe 11 from the first heat exchanger 20 to the heating pipe 41, and start the hot water circulation of the heating circuit 40 through the water pump 80 to ensure the indoor heating effect. In this way, it can ensure that users can obtain domestic hot water that meets their expectations at any time, and can flexibly adjust the heating mode according to actual needs, achieving high efficiency and energy saving while ensuring comfort and safety during use.

[0069] like Figure 1 and Figure 9 As shown, in one embodiment of the present invention, the heating and hot water equipment 100 further includes a heating circuit 40, which includes an indoor thermostat; step S100 further includes: S170. Upon receiving the rapid heating command, if the current working mode of the heating and hot water equipment is in heating mode and the indoor thermostat is off, obtain the target temperature of domestic water, the target temperature of heating water, and the outlet temperature of domestic water pipe. S180A, if the outlet water temperature of the domestic water pipeline is determined to be less than the difference between the target domestic water temperature and the first preset temperature, determine that the heating and hot water equipment meets the entry conditions for the rapid heating mode; or S180B: If the outlet water temperature of the domestic water pipeline is greater than the sum of the target domestic water temperature and the second preset temperature, determine that the heating hot water equipment meets the exit conditions for the rapid heating mode.

[0070] In this embodiment, when the heating and hot water equipment 100 receives a rapid heating command and is in heating mode providing heating, but the indoor thermostat is off, the indoor thermostat monitors the indoor ambient temperature and sends an on / off signal to the heating and hot water equipment 100 to control whether to continue supplying heat to the heating circuit 40. The off indoor thermostat indicates that the current indoor temperature has reached the user's desired target heating water temperature, and the heating and hot water equipment 100 does not need to continue supplying heat to the heating circuit 40.

[0071] In this state, although the heating and hot water equipment 100 is still in heating mode, the actual heating demand has been suspended. If the user issues a quick-heating command at this time, it indicates that he or she has an immediate need for domestic hot water.

[0072] To balance user experience and energy efficiency, the heating and hot water system 100 detects the outlet temperature of the domestic water pipe 30. If the outlet temperature of the domestic water pipe 30 is less than the difference between the target domestic water temperature and the first preset temperature, it is determined that the current water temperature is insufficient to meet the requirement of rapid hot water delivery. Based on this, the heating and hot water system 100 determines that the conditions for entering the rapid heating mode are met and controls the heating circuit 10 to direct hot water to the first heat exchanger 20, prioritizing the increase of the domestic hot water temperature. This control strategy ensures timely response to domestic hot water demand when indoor heating is not needed, avoids delays in hot water supply due to misjudgment of the operating status, and prevents unnecessary continuous combustion, thereby improving overall operating efficiency.

[0073] If the outlet water temperature of the domestic water pipe 30 is greater than the sum of the domestic water target temperature and the second preset temperature, it indicates that the current domestic hot water temperature is significantly higher than the domestic water target temperature set by the user. Continuing to supply hot water to the first heat exchanger 20 may cause the outlet water to overheat or waste energy. Based on this, the heating and hot water equipment 100 determines that the exit conditions of the rapid heating mode are met and controls the heating circuit 10 to stop switching hot water to the first heat exchanger 20, thereby maintaining a reasonable energy efficiency level while ensuring user comfort.

[0074] like Figure 1 and Figure 10 As shown, in one embodiment of the present invention, the heating and hot water equipment 100 further includes a water pump 80 disposed in the heating circuit 40; the control method of the heating and hot water equipment 100 further includes: S1000: If the heating and hot water equipment meets the exit conditions for the rapid heating mode, control the water pump to stop running. S1100: When the indoor thermostat is closed, control the heating circuit to switch the hot water to the heating circuit, and control the heating circuit to circulate hot water.

[0075] In this embodiment, when the outlet water temperature of the domestic water pipe 30 reaches or exceeds the sum of the target domestic water temperature and the second preset temperature, it indicates that the current domestic hot water temperature has met or is even slightly higher than the user's expectations, and there is no need to continue heating through the first heat exchanger 20. At this time, the heating and hot water equipment 100 will stop the operation of the water pump 80, so that the heating circuit 40 enters a non-circulation state. At the same time, the three-way valve 90 can be kept in the middle position, neither continuously supplying water to the first heat exchanger 20 nor to the heating pipe 41, thereby avoiding ineffective energy consumption.

[0076] In this state, the heating and hot water equipment 100 is in standby mode, awaiting further usage signals. If the indoor thermostat closes subsequently, it indicates that the indoor temperature has fallen below the user's desired target heating water temperature, and the heating demand is retried. At this time, the heating and hot water equipment 100 will control the heating pipe 11 to switch hot water to the heating pipe 41 and start the water pump 80 to drive the hot water to circulate in the heating circuit 40 to restore the heating function. This control logic ensures that, under the premise that the domestic hot water demand has been met, the rapid heating-related operations are promptly exited, and a rapid response is made when the heating demand reappears, effectively coordinating the switching between domestic hot water and heating functions, taking into account both user comfort and energy efficiency.

[0077] like Figure 1 and Figure 11 As shown, in one embodiment of the present invention, the heating and hot water equipment 100 further includes a heating circuit 40; the control method of the heating and hot water equipment 100 further includes: S1200: When it is determined that there is a risk of freezing in the heating circuit and the domestic water pipe has been continuously heated for a period of time up to the third preset duration, the heating circuit is controlled to switch hot water to the heating circuit, and the heating circuit is controlled to circulate hot water. S1300: When the duration of hot water circulation in the heating circuit reaches the fourth preset duration, perform an antifreeze test on the heating circuit.

[0078] In this embodiment, a first temperature detection element 50 can be installed on at least one of the second inlet pipe 31 and the second outlet pipe 32. For example, the first temperature detection element 50 can be installed on both the second inlet pipe 31 and the second outlet pipe 32. The first temperature detection element 50 may include, but is not limited to, a temperature sensor, and may also include a thermistor or other contact temperature measuring element. The first temperature detection element 50 can detect the temperature of the tap water entering the domestic water pipe 30. If the detected temperature is lower than the preset inlet water temperature, it indicates that the temperature of the water entering from the domestic water inlet 301 is low, thereby determining that the current ambient temperature is low and the heating circuit 40 may be at risk of freezing. Alternatively, the heating and hot water equipment 100 can be connected to a network device. The network device can obtain the local weather forecast temperature and transmit it to the heating and hot water equipment 100. The heating and hot water equipment 100 can determine whether the local environment is low based on the obtained local weather forecast temperature, thereby assisting in determining whether the heating circuit 40 is at risk of freezing.

[0079] By using local water temperature sensing or remote meteorological information, the system can promptly identify the risk of icing in the heating circuit 40 when the user has not activated the heating function but the external environment is approaching freezing point. Upon receiving a rapid heating command, it indicates that the user has a need for quick access to domestic hot water. To meet this need, the heating and hot water equipment 100 can connect the second heat exchange channel 202 to the heating pipe 11 and control the burner to ignite. The high-temperature flue gas generated by the combustion flows through the second heat exchanger 113, exchanging heat with the water inside the second heat exchanger 113. The heated water then flows through the second heat exchange channel 202 of the first heat exchanger 20, transferring heat to the domestic water in the first heat exchange channel 201, thus achieving a rapid supply of domestic hot water.

[0080] When the domestic water pipe 30 has been continuously heated for the third preset duration, the heating and hot water equipment 100 has completed one round of priority heating for domestic hot water, indicating that the user's immediate need for domestic hot water has been initially met. The domestic water pipe 30 is continuously heated for the third preset duration because after the rapid heating command is triggered, it is necessary to ensure that the domestic hot water outlet reaches a usable temperature within this third preset duration to avoid affecting the user experience due to insufficient heating time. The specific value of the third preset duration is generally not limited here; for example, it can be that the rapid heating function has been running continuously for more than 30 minutes or one hour before the heating and hot water equipment 100 considers the initial heating target for domestic hot water to have been basically achieved. If, at this point, hot water continues to flow only to the first heat exchanger 20, the heating circuit 40 will remain in a low-temperature stagnant state, potentially increasing the risk of icing. Therefore, the heating and hot water equipment 100 can connect the heating pipe 11 to the heating pipe 41, so that the high-temperature flue gas generated by the burner passes through the second heat exchanger 113 and exchanges heat with the second heat exchanger 113 to heat the water in the second heat exchanger 113; the heated water then enters the heating pipe 41 and drives the hot water to circulate in the heating circuit 40, thereby increasing the overall temperature of the heating circuit 40 and reducing the possibility of it freezing.

[0081] If the heating circuit 40 circulates hot water for a duration that reaches the fourth preset time, it indicates that the heating circuit 40 has had sufficient time to raise its internal water temperature through hot water circulation, thus meeting the basic conditions for assessing its antifreeze status. The fourth preset time for hot water circulation in the heating circuit 40 is chosen because the heating circuit 40 typically contains relatively long pipes. In residential or multi-story buildings, it takes time for heat to transfer from the location of the heating hot water equipment 100 to the furthest point in the pipes. If the fourth preset time is too short, only the pipes near the heating hot water equipment 100 may heat up, while the pipes far from the heating hot water equipment 100 remain at a low temperature, failing to accurately reflect the overall antifreeze status of the heating circuit 40.

[0082] At this time, the heating and hot water equipment 100 can perform antifreeze testing on the heating circuit 40. For example, a water pump 80 is installed on the heating pipe 11 to drive the hot water to circulate in the heating circuit 40. The water pump 80 can be controlled to run for a first preset time, because a short circulation may not be enough to make the water temperature of the entire heating circuit 40 rise evenly, and setting a reasonable first preset time helps to ensure that the heat is fully distributed to the farthest part of the pipe. The specific value of the first preset time is generally not limited here, for example, two minutes. This first preset time can be adaptively adjusted according to factors such as equipment power, pipe length and ambient temperature. At the same time, a second temperature detection element 60 is installed on the first inlet pipe 111 and / or the first outlet pipe 112 to detect the inlet or outlet water temperature of the heating pipe 11. The second temperature sensor 60 is installed in the first inlet pipe 111 and / or the first outlet pipe 112 because the first inlet pipe 111 and / or the first outlet pipe 112 are within the rapid heating range, which is a high-temperature zone. This allows it to accurately reflect the actual water temperature of the heating circuit 40 after the water pump 80 has circulated, thus providing a reliable basis for antifreeze judgment. If the heating and hot water equipment 100 detects that the inlet or outlet water temperature of the heating pipe 11 is lower than the preset temperature within the first preset time period, it indicates that the overall water temperature of the heating circuit 40 is still too low after circulation, and the hot water cannot effectively raise the temperature of the distant pipes, potentially posing a freezing risk. Antifreeze protection measures need to be continued, such as extending the hot water circulation time or increasing the combustion power. Conversely, if the temperature is not above the preset temperature, it can be considered that the current temperature of the heating circuit 40 has returned to a safe range, and the second heat exchange channel 202 can be reconnected to the heating pipe 11 to continue meeting the rapid heating requirement.

[0083] Thus, the heating and hot water equipment 100 of the present invention can improve the heating speed of the domestic water pipe 30 and ensure the rapid heating response effect, while effectively reducing the risk of freezing of the heating circuit 40 in low-temperature environments, and effectively improving the operational safety and equipment reliability of the heating and hot water equipment 100 in non-heating seasons or when users do not actively activate the heating function.

[0084] like Figure 1 and Figure 12 As shown, in one embodiment of the present invention, determining the risk of icing in the heating circuit 40 in step S1200 includes: S1210. Obtain the current operating mode of the heating and hot water equipment, as well as the inlet water temperature of the domestic water pipes and / or the local weather forecast temperature. S1220. If the current working mode of the heating and hot water equipment is in non-heating mode, and the inlet water temperature of the domestic water pipe is lower than the preset inlet water temperature and / or the local weather forecast temperature is lower than the preset weather forecast temperature, it is determined that there is a risk of freezing in the heating circuit.

[0085] In this embodiment, the non-heating mode refers to the heating and hot water equipment 100 not being in a mode where the primary goal is to continuously supply heat to the heating circuit 40. For example, the user has not turned on the heating function, and may only be able to perform domestic hot water-related operations or the equipment may be in standby mode. The preset inlet water temperature refers to a reference temperature used to characterize that domestic water has been affected by a low-temperature environment, which may indirectly reflect that the thermal environment of the heating circuit 40 is approaching a dangerous level. It is generally set between four and seven degrees Celsius. The preset weather forecast temperature refers to a reference temperature used to assess whether external meteorological conditions have reached a level that may cause the heating circuit 40 to freeze. It is generally set between zero and three degrees Celsius. If the inlet water temperature entering the domestic water pipe 30 is detected to be lower than the preset inlet water temperature, and / or the local weather forecast obtained through the network shows that the ambient temperature is lower than the preset weather forecast temperature, it indicates that the external environment may be in a low-temperature condition. Since the heating circuit 40 has not been heated and has been stagnant for a long time, the internal water temperature is likely to drop with the environment, thus having the potential to freeze.

[0086] By combining at least one of the current mode of the heating and hot water equipment 100 and temperature information, the potential freezing risk of the heating circuit 40 can be better identified, avoiding the heating and hot water equipment 100 from ignoring the antifreeze protection due to misjudging the ambient temperature as sufficient when a rapid heating demand is triggered. This judgment method can take into account both the immediacy of the locally measured water temperature and the foresight of the weather forecast temperature. Even when the user has not actively activated the heating function but the environment is close to freezing point, the antifreeze intervention logic can still be activated in a timely manner, providing a reliable premise for ensuring both the response speed of domestic hot water and the safety of the heating circuit 40.

[0087] like Figure 1 and Figure 13 As shown, in one embodiment of the present invention, the heating and hot water equipment 100 further includes a water pump 80 disposed in the heating circuit 40; the control method of the heating and hot water equipment 100 further includes: S1400: Control the water pump to run for the fifth preset time and obtain the temperature of the heating circuit; S1500. If the heating circuit temperature is lower than the preset temperature within the fifth preset time period, it is determined that the heating circuit has frozen.

[0088] In this embodiment, the water pump 80 is used to drive hot water to circulate in the heating circuit 40 to promote the uniform distribution of heat in the heating circuit 40. Controlling the operation of the water pump 80 for a first preset duration ensures sufficient time for water to flow through all parts of the heating circuit 40, preventing the circulation time from being too short and only reflecting the water temperature near the heating hot water equipment 100, thus affecting the judgment of the overall freezing state. The temperature of the heating circuit 10 can be collected by the second temperature sensor 60 installed in the first inlet pipe 111 and / or the first outlet pipe 112. This location is in the high-temperature zone after heat exchange and can accurately reflect the actual water temperature of the heating circuit 40 after circulation. If the temperature of the heating circuit 10 obtained during the first preset duration of water pump 80 operation is still lower than the preset temperature, it indicates that even after circulation, the water temperature inside the heating circuit 40 has not effectively recovered, possibly indicating water flow obstruction or local freezing, thus inferring that the heating circuit 40 has frozen. This judgment method combines circulation and temperature feedback, taking into account antifreeze safety during rapid heating operation, which helps to trigger further defrosting or protection measures in a timely manner and improves the operational reliability of the equipment in low-temperature environments.

[0089] The present invention also proposes a heating and hot water device 100, such as... Figure 1 As shown, the heating and hot water equipment 100 includes a processor and a memory. The memory stores the control program of the heating and hot water equipment 100. When the processor executes the control program of the heating and hot water equipment 100, it implements the control method of the heating and hot water equipment 100 as described above. The specific structure of the control method of the heating and hot water equipment 100 refers to the above embodiments. Since the heating and hot water equipment 100 adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0090] like Figure 1 As shown, in one embodiment of the present invention, the heating and hot water equipment 100 further includes a heating pipe 11, a first heat exchanger 20, a domestic water pipe 30, and a heating pipe 41; wherein, the domestic water pipe 30 has a domestic water inlet 301 and a domestic water outlet 302, the first heat exchanger 20 has a first heat exchange channel 201 and a second heat exchange channel 202, the first heat exchange channel 201 connects the domestic water inlet 301 and the domestic water outlet 302, the second heat exchange channel 202 is connected in parallel with the heating pipe 11 to form a heating circuit 10, and the heating pipe 11 is connected in parallel with the heating pipe 41 to form a heating circuit 40.

[0091] In this embodiment, the heating pipe 11 is used to transport high-temperature water heated by a heat source. This high-temperature water can selectively flow into the second heat exchange channel 202 or the heating pipe 41 according to operational needs. When flowing into the second heat exchange channel 202, heat is transferred to the tap water in the first heat exchange channel 201 through the first heat exchanger 20, thereby providing domestic hot water. When flowing into the heating pipe 41, heat is transported to the indoor heat dissipation terminal through the heating circuit 40 to achieve the heating function. By connecting the second heat exchange channel 202 and the heating pipe 11 in parallel to form the heating circuit 10, and connecting the heating pipe 11 and the heating pipe 41 in parallel to form the heating circuit 40, the heating and hot water equipment 100 can flexibly switch between two operating states: rapid heating and heating. This pipe structure provides the hardware foundation for the aforementioned control method, enabling the rapid response of domestic hot water while effectively taking into account the antifreeze protection and temperature maintenance of the heating circuit 40, thereby improving the safety, energy efficiency, and user experience of the entire unit in complex usage scenarios.

[0092] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention specification and drawings under the technical concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A control method for a heating and hot water equipment, characterized in that, The heating and hot water equipment includes a heating circuit, a first heat exchanger, and a domestic water pipeline. The control method for the heating and hot water equipment includes: Upon receiving a rapid heating command, determine whether the heating and hot water equipment meets the conditions for entering or exiting the rapid heating mode. Once it is determined that the heating hot water equipment meets the conditions for entering the rapid heating mode, the heating circuit is controlled to switch the hot water to the first heat exchanger to heat the domestic water pipeline.

2. The control method for heating and hot water equipment as described in claim 1, characterized in that, Upon receiving a rapid heating command, determining whether the heating and hot water equipment meets the entry or exit conditions for rapid heating mode includes: Upon receiving a rapid heating command, and with the heating and hot water equipment currently operating in non-heating mode, the system acquires the water flow rate of the domestic water pipeline, the outlet temperature of the domestic water pipeline, and the target temperature of the domestic water. If the flow rate of the domestic water pipe is determined to be greater than the preset flow rate, determine whether the heating and hot water equipment meets the conditions for entering the rapid heating mode; or If the flow rate of the domestic water pipe is determined to be no greater than the preset flow rate, and the outlet water temperature of the domestic water pipe is less than the difference between the target domestic water temperature and the first preset temperature, then the heating and hot water equipment is determined to meet the entry conditions for the rapid heating mode; or If the water flow rate of the domestic water pipeline is determined to be no greater than the preset water flow rate, and the outlet water temperature of the domestic water pipeline is greater than the sum of the target domestic water temperature and the second preset temperature, then the heating and hot water equipment meets the exit conditions for the rapid heating mode.

3. The control method for heating and hot water equipment as described in claim 2, characterized in that, The control method for the heating and hot water equipment also includes: If the heating hot water equipment meets the exit conditions for the rapid heating mode, the control circuit stops switching the hot water to the first heat exchanger.

4. The control method for a heating and hot water equipment as described in claim 1, characterized in that, The heating and hot water equipment also includes a heating circuit; upon receiving a rapid heating command, determining whether the heating and hot water equipment meets the entry or exit conditions for rapid heating mode also includes: Upon receiving a rapid heating command, if the current operating mode of the heating and hot water equipment is in heating mode and the outlet water temperature of the heating circuit is lower than the preset heating water temperature, the target temperature of domestic water, the target temperature of heating water, and the outlet water temperature of the domestic water pipeline are obtained. If the target domestic water temperature is less than the sum of the target heating water temperature and the third preset temperature, the target domestic water temperature is not greater than the preset domestic water temperature, and the outlet water temperature of the domestic water pipeline is less than the difference between the target domestic water temperature and the fourth preset temperature, then the heating and hot water equipment meets the conditions for entering the rapid heating mode; or If the target domestic water temperature is less than the sum of the target heating water temperature and the third preset temperature, the target domestic water temperature is greater than the preset domestic water temperature, and the outlet water temperature of the domestic water pipeline is less than the difference between the target domestic water temperature and the third preset temperature, then the heating and hot water equipment meets the conditions for entering the rapid heating mode; or Under the condition that the target temperature of domestic water is not less than the sum of the target temperature of heating water and the third preset temperature, and the outlet temperature of domestic water is less than the difference between the target temperature of heating water and the first preset temperature, the heating and hot water equipment is determined to meet the entry conditions for the rapid heating mode; or If the outlet water temperature of the domestic water pipeline is determined to be greater than the sum of the target domestic water temperature and the second preset temperature, the heating and hot water equipment is determined to meet the exit conditions of the rapid heating mode.

5. The control method for a heating and hot water equipment as described in claim 4, characterized in that, The heating hot water equipment also includes a water pump installed in the heating circuit; the control method of the heating hot water equipment further includes: If the heating and hot water equipment meets the exit conditions for the rapid heating mode, control the heating circuit to switch the hot water to the heating circuit, and control the heating circuit to circulate the hot water. Obtain the outlet water temperature of the heating circuit; If the outlet water temperature of the heating circuit is determined to be greater than the sum of the target heating water temperature and the fifth preset temperature, the heating circuit is controlled to stop heating and the water pump is controlled to run until the outlet water temperature of the heating circuit is less than the difference between the target heating water temperature and the fifth preset temperature, at which point the heating circuit is controlled to start heating.

6. The control method for a heating and hot water equipment as described in claim 1, characterized in that, The heating and hot water equipment also includes a heating circuit; upon receiving a rapid heating command, determining whether the heating and hot water equipment meets the entry or exit conditions for rapid heating mode also includes: Upon receiving a rapid heating command, if the current working mode of the heating and hot water equipment is in heating mode and the outlet water temperature of the heating circuit is not lower than the preset heating water temperature, the target temperature of domestic water, the target temperature of heating water, and the outlet water temperature of the domestic water pipeline are obtained. If the target domestic water temperature is less than the target heating water temperature and the third preset temperature, the target domestic water temperature is not greater than the preset domestic water temperature, and the outlet water temperature of the domestic water pipeline is less than the difference between the target domestic water temperature and the fourth preset temperature, then the heating and hot water equipment meets the conditions for entering the rapid heating mode; or If the target domestic water temperature is less than the target heating water temperature and the third preset temperature, the target domestic water temperature is greater than the preset domestic water temperature, and the outlet water temperature of the domestic water pipeline is less than the difference between the target domestic water temperature and the fifth preset temperature, then the heating and hot water equipment meets the conditions for entering the rapid heating mode; or If the target temperature of domestic water is not less than the target temperature of heating water and the third preset temperature, and the outlet temperature of domestic water is less than the difference between the target temperature of heating water and the first preset temperature, then the heating and hot water equipment meets the conditions for entering the rapid heating mode; or If the outlet water temperature of the domestic water pipeline is determined to be greater than the sum of the target domestic water temperature and the second preset temperature, the heating and hot water equipment is determined to meet the exit conditions of the rapid heating mode.

7. The control method for a heating and hot water equipment as described in claim 6, characterized in that, The heating hot water equipment also includes a water pump installed in the heating circuit; the control method of the heating hot water equipment further includes: If the heating hot water equipment meets the exit conditions of the rapid heating mode, control the heating circuit to stop switching hot water to the first heat exchanger, and control the water pump to circulate for a first preset time and stop running for a second preset time. Obtain the outlet water temperature of the heating circuit; If the outlet water temperature of the heating circuit is less than the difference between the target heating water temperature and the fifth preset temperature, the heating circuit is controlled to switch hot water to the heating circuit, and the heating circuit is controlled to circulate hot water.

8. The control method for a heating and hot water equipment as described in claim 1, characterized in that, The heating and hot water equipment also includes a heating circuit, which includes an indoor thermostat; upon receiving a rapid heating command, determining whether the heating and hot water equipment meets the entry or exit conditions for rapid heating mode further includes: Upon receiving a rapid heating command, if the heating and hot water equipment is currently in heating mode and the indoor thermostat is off, the target temperature of the domestic water, the target temperature of the heating water, and the outlet temperature of the domestic water pipe are obtained. If the outlet water temperature of the domestic water pipeline is determined to be less than the difference between the target domestic water temperature and the first preset temperature, then the heating and hot water equipment is determined to meet the entry conditions for the rapid heating mode; or If the outlet water temperature of the domestic water pipeline is determined to be greater than the sum of the target domestic water temperature and the second preset temperature, the heating and hot water equipment is determined to meet the exit conditions of the rapid heating mode.

9. The control method for a heating and hot water equipment as described in claim 8, characterized in that, The heating hot water equipment also includes a water pump installed in the heating circuit; the control method of the heating hot water equipment further includes: Once it is determined that the heating and hot water equipment meets the exit conditions for the rapid heating mode, the water pump is controlled to stop running; With the indoor thermostat closed, the heating circuit is switched to hot water, and the heating circuit is circulated with hot water.

10. The control method for a heating and hot water equipment as described in claim 1, characterized in that, The heating and hot water equipment also includes a heating circuit; the control method for the heating and hot water equipment further includes: If it is determined that there is a risk of freezing in the heating circuit and the domestic water pipe has been continuously heated for the third preset time, the heating circuit is controlled to switch hot water to the heating circuit, and the heating circuit is controlled to circulate hot water. When the duration of hot water circulation in the heating circuit reaches the fourth preset duration, an antifreeze test is performed on the heating circuit.

11. The control method for a heating and hot water equipment as described in claim 10, characterized in that, The determination that the heating circuit is at risk of icing includes: Obtain the current operating mode of the heating and hot water equipment, as well as the inlet water temperature of the domestic water pipes and / or the local weather forecast temperature; If the heating and hot water equipment is currently in non-heating mode, and the inlet water temperature of the domestic water pipe is lower than the preset inlet water temperature and / or the local weather forecast temperature is lower than the preset weather forecast temperature, it is determined that there is a risk of freezing in the heating circuit.

12. The control method for a heating and hot water equipment as described in claim 10, characterized in that, The heating hot water equipment also includes a water pump installed in the heating circuit; the control method of the heating hot water equipment further includes: Control the water pump to run for a fifth preset time and obtain the temperature of the heating circuit; If the heating circuit temperature is lower than the preset temperature within the fifth preset time period, it is determined that the heating circuit has frozen.

13. A heating and hot water equipment, characterized in that, The device includes a processor and a memory, wherein the memory stores a control program for a heating and hot water device, and when the processor executes the control program for the heating and hot water device, it implements the control method for the heating and hot water device as described in any one of claims 1 to 12.

14. The heating and hot water equipment as described in claim 13, characterized in that, The heating and hot water equipment also includes heating pipes, a first heat exchanger, domestic water pipes, and heating pipes; wherein, The domestic water pipeline has a domestic water inlet and a domestic water outlet. The first heat exchanger has a first heat exchange channel and a second heat exchange channel. The first heat exchange channel connects the domestic water inlet and the domestic water outlet. The second heat exchange channel is connected in parallel with the heating pipeline to form a heating circuit. The heating pipeline is connected in parallel with the heating pipeline to form a heating circuit.

15. The heating and hot water equipment as described in claim 13, characterized in that, The heating and hot water equipment is a gas-fired wall-hung boiler.

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