Control method for water heater

Abstract

The invention relates to the technical field of water heaters, particularly provides a control method for a water heater, and aims at solving the problem that an existing water heater is poor in heat exchange effect. In order to achieve the purpose, according to the control method for the water heater, in the operation process of an air bag assembly, the water inlet temperature Twi of a water inlet pipe and the water outlet temperature Two of a water outlet pipe are obtained, the difference value between the water inlet temperature Twi and the water outlet temperature Two serves as the temperature difference delta T to be used for judging the heat exchange effect of the water heater, and the ventilation period of the air bag assembly is adjusted according to the range where the temperature difference delta T is located; accordingly, the expansion and contraction speed of the air bag assembly is adjusted so that water in the water tank can generate turbulence effects of different degrees, the heat exchange effect of the water heater can be adjusted, the heat exchange effect of the water heater is improved, and meanwhile the advantage of saving energy is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of water heaters, and particularly provides a control method for a water heater. Background Art

[0002] A water heater uses the principle of heat absorption and heat release during the phase change of a refrigerant to heat the water in a water tank, thereby producing high-temperature hot water. During the process of using the water heater to produce hot water, as the water temperature in the water tank gradually rises, the heat exchange efficiency of the heat exchanger will gradually decrease, affecting the heat exchange effect and resulting in a poor user experience.

[0003] Therefore, a new technical solution is needed in this field to solve the above problems. Summary of the Invention

[0004] The present invention aims to solve the above technical problems, that is, to solve the problem of poor heat exchange effect of existing water heaters.

[0005] The present invention provides a control method for a water heater. The water heater includes a water tank, an airbag assembly, a heat exchanger, and a liquid pipeline system; the airbag assembly is arranged in the water tank; the liquid pipeline system includes a water inlet pipe and a water outlet pipe, and the water inlet pipe and the water outlet pipe are respectively connected to the water tank and the heat exchanger to supply water to and discharge water from the heat exchanger.

[0006] The control method includes the following steps:

[0007] During the operation of the airbag assembly, obtain the inlet water temperature T wi of the water inlet pipe and the outlet water temperature T wo of the water outlet pipe;

[0008] Calculate the temperature difference ΔT between the outlet water temperature T wo and the inlet water temperature T wi ;

[0009] Determine in which range the temperature difference ΔT is;

[0010] According to the range where the temperature difference ΔT is located, determine the operation mode of the airbag assembly;

[0011] According to the determined operation mode, adjust the ventilation cycle of the airbag assembly.

[0012] In a preferred technical solution of the above control method, the step of "according to the range where the temperature difference ΔT is located, determine the operation mode of the airbag assembly" further includes:

[0013] If ΔT < A, control the airbag assembly to operate in the first operation mode;

[0014] If A ≤ ΔT < B, control the airbag assembly to operate in the second operating mode;

[0015] If ΔT ≥ B, control the airbag assembly to operate in the third operating mode;

[0016] Where A is the first preset temperature difference and B is the second preset temperature difference, and A < B.

[0017] In a preferred technical solution of the above control method, when the airbag assembly operates in the first operating mode, the control method includes:

[0018] The airbag assembly continuously operates for the first set time t1, and the inlet water temperature T is obtained again wi and the outlet water temperature T wo ;

[0019] Calculate the temperature difference ΔT between the outlet water temperature T wo and the inlet water temperature T wi ;

[0020] Judge the magnitudes of the temperature difference ΔT, the first preset temperature difference A, and the second preset temperature difference B;

[0021] Adjust the ventilation cycle of the airbag assembly according to the first judgment result.

[0022] In a preferred technical solution of the above control method, the step of "adjust the ventilation cycle of the airbag assembly according to the first judgment result" further includes: <​​​​​​​​​​​​​​​​​​​​​​​​​​If A ≤ ΔT < B, then control the airbag assembly to maintain the current ventilation cycle operation;

[0030] If ΔT ≥ B, then extend the ventilation cycle of the airbag assembly and shorten the operation duration of the ventilation cycle of the airbag assembly.

[0031] In a preferred technical solution of the above control method, the step of "adjusting the ventilation cycle of the airbag assembly according to the first judgment result" further includes:

[0032] When ΔT ≥ B, obtain the current ventilation cycle of the airbag assembly;

[0033] After controlling the airbag assembly to operate for a third set time t3 with the current ventilation cycle, obtain the inlet water temperature T again wi and the outlet water temperature T wo ;

[0034] Calculate the temperature difference ΔT between the outlet water temperature T wo and the inlet water temperature T wi ;

[0035] Judge the magnitude of the temperature difference ΔT and the second preset temperature difference B;

[0036] If ΔT < B, then control the airbag assembly to maintain the current ventilation cycle operation;

[0037] If ΔT ≥ B, then extend the ventilation cycle of the airbag assembly and shorten the operation duration of the ventilation cycle of the airbag assembly.

[0038] In a preferred technical solution of the above control method, when the airbag assembly operates in the second operation mode, the control method includes:

[0039] Control the airbag assembly to maintain the current ventilation cycle operation.

[0040] In a preferred technical solution of the above control method, when the airbag assembly operates in the third operation mode, the control method includes:

[0041] After maintaining the operation of the airbag assembly for a fourth set time t4, obtain the inlet water temperature T again wi and the outlet water temperature T wo ;

[0042] Calculate the temperature difference ΔT between the outlet water temperature T wo and the inlet water temperature T wi ;

[0043] Judge the magnitude of the temperature difference ΔT and the second preset temperature difference B;

[0044] According to the second judgment result, the ventilation cycle of the airbag assembly is adjusted.

[0045] In the preferred technical solution of the above control method, the step of “adjusting the ventilation cycle of the airbag assembly according to the second judgment result” further includes:

[0046] If ΔT≥B, the ventilation cycle of the airbag assembly is extended and the running time of the ventilation cycle of the airbag assembly is shortened.

[0047] In the preferred technical solution of the above control method, the ventilation cycle includes an intake period and an exhaust period that operate alternately;

[0048] The air intake period is the time it takes for the airbag assembly to perform one air intake operation, and the air exhaust period is the time it takes for the airbag assembly to perform one air exhaust operation.

[0049] In the preferred technical solution of the present application, an air bag assembly is provided in the water tank. The expansion and contraction of the air bag assembly can increase the turbulence of the water in the water tank, thereby improving the heat exchange effect of the water heater. During the operation of the air bag assembly, the water inlet temperature T wi and the outlet water temperature T wo The difference between the two is used as the temperature difference ΔT to judge the heat exchange effect of the water heater. According to the range of the temperature difference ΔT, the ventilation cycle of the airbag assembly is adjusted, thereby adjusting the expansion and contraction speed of the airbag assembly to make the water in the water tank produce different degrees of turbulence, thereby adjusting the heat exchange effect of the water heater, improving the heat exchange effect of the water heater, and also having the advantage of saving energy.

[0050] Furthermore, the outlet water temperature T wo With the inlet water temperature T wi The temperature difference ΔT is compared with the first preset temperature difference A and the second preset temperature difference B to determine the range of the temperature difference ΔT, and according to the range of the temperature difference ΔT, the airbag assembly is operated in different operating modes; based on the above control method, the airbag assembly can be operated in the most appropriate operating mode, thereby more accurately adjusting the ventilation cycle of the airbag assembly and improving the heat exchange effect of the water heater.

[0051] Furthermore, when the airbag assembly is operating in the first operating mode, if after running for a period of time, the temperature difference ΔT obtained is still less than the first preset temperature difference A, the ventilation cycle of the airbag assembly is shortened and the operating time of the ventilation cycle of the airbag assembly is extended; based on the above control method, since the volume change of expansion and the volume change of contraction of the airbag assembly do not change when the airbag assembly is running in the ventilation cycle, shortening the ventilation cycle of the airbag assembly can speed up the expansion and contraction speed of the airbag assembly, increase the turbulence of the water in the water tank, improve the heat exchange efficiency, and enhance the heat exchange effect.

[0052] Furthermore, when the airbag assembly is running in the first operating mode, if after running for a period of time, the temperature difference ΔT obtained is less than or equal to the first preset temperature difference A and greater than the second preset temperature difference B, the current ventilation cycle of the airbag assembly is obtained, and after the airbag assembly runs for a period of time with the current ventilation cycle, the size of the temperature difference ΔT and the first preset temperature difference A and the second preset temperature difference B is judged again. If the temperature difference ΔT is less than or equal to the first preset temperature difference A and greater than the second preset temperature difference B, the airbag assembly is controlled to maintain the current ventilation cycle. If the temperature difference ΔT is greater than or equal to the second preset temperature difference B, then Extend the ventilation cycle of the airbag assembly and shorten the running time of the ventilation cycle of the airbag assembly; based on the above control method, on the one hand, the ventilation cycle of the airbag assembly is maintained, the expansion and contraction speed of the airbag assembly remains unchanged, and the turbulence of the water in the water tank remains unchanged, which can maintain the heat exchange effect of the water heater at a good level and improve the heat exchange effect; on the other hand, since the volume change of the airbag assembly when it expands and the volume change of the airbag assembly when it contracts do not change, shortening the ventilation cycle of the airbag assembly can slow down the expansion and contraction speed of the airbag assembly, reduce the turbulence of the water in the water tank, and save energy.

[0053] Furthermore, when the airbag assembly is operating in the first operating mode, if after running for a period of time, the temperature difference ΔT obtained is greater than or equal to the second preset temperature difference B, the current ventilation cycle of the airbag assembly is obtained, and after the airbag assembly runs for a period of time with the current ventilation cycle, the size of the temperature difference ΔT and the second preset temperature difference B is judged again. If the temperature difference ΔT is less than the second preset temperature difference B, the airbag assembly is controlled to maintain the current ventilation cycle. If the temperature difference ΔT is still greater than or equal to the second preset temperature difference B, the ventilation cycle of the airbag assembly is extended and the running time of the ventilation cycle of the airbag assembly is shortened. Based on the above control method, on the one hand, the ventilation cycle of the airbag assembly is maintained, the expansion and contraction speed of the airbag assembly remains unchanged, and the turbulence of the water in the water tank remains unchanged, which can maintain the heat exchange effect of the water heater at a good level and improve the heat exchange effect. On the other hand, since the volume change of the expansion and contraction of the airbag assembly has not changed, extending the ventilation cycle of the airbag assembly can slow down the expansion and contraction speed of the airbag assembly, reduce the turbulence of the water in the water tank, and save energy.

[0054] Furthermore, when the airbag assembly operates in the second operating mode, the airbag assembly is controlled to maintain the current ventilation cycle; based on the above control method, the ventilation cycle of the airbag assembly is maintained, the expansion and contraction speed of the airbag assembly remains unchanged, and the turbulence level of the water in the water tank remains unchanged, which can maintain the heat exchange effect of the water heater at a good level and improve the heat exchange effect.

[0055] Furthermore, when the airbag assembly is operating in the third operating mode, if after running for a period of time, the temperature difference ΔT obtained is still greater than or equal to the second preset temperature difference B, the ventilation cycle of the airbag assembly is extended and the operating time of the ventilation cycle of the airbag assembly is shortened; based on the above control method, since the volume change of the airbag assembly during expansion and the volume change of the airbag assembly during contraction have not changed, extending the ventilation cycle of the airbag assembly can slow down the expansion and contraction speed of the airbag assembly, reduce the turbulence of the water in the water tank, and save energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] The preferred embodiments of the present invention are described below with reference to the accompanying drawings, in which:

[0057] Figure 1 is a flow chart of a control method for a water heater of the present invention;

[0058] Figure 2 is a schematic diagram of the water heater of the present invention in the air intake phase;

[0059] Figure 3 is a schematic diagram of the water heater of the present invention in the exhaust phase;

[0060] Figure 4 It is a logic diagram of a possible implementation of the control method for a water heater of the present invention. DETAILED DESCRIPTION

[0061] The preferred embodiments of the present application are described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the present application and are not intended to limit the scope of protection of the present application.

[0062] It should be noted that, in the description of the present invention, the terms "first", "second", "third" and "fourth" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0063] See first Figures 1 to 3 , the control method for the water heater of the present invention is described. Figure 1 is a flow chart of a control method for a water heater of the present invention; Figure 2 is a schematic diagram of the water heater of the present invention in the air intake phase; Figure 3 It is a schematic diagram of the water heater of the present invention in the exhaust phase.

[0064] like Figure 2 and Figure 3As shown, in order to solve the problem of poor heat exchange effect of the water heater, the present invention provides a control method for the water heater, the water heater includes a water tank, an air bag assembly, a heat exchanger and a liquid piping system; the air bag assembly is arranged in the water tank; the heat exchanger is connected to the water tank through the liquid piping system; specifically, the liquid piping system includes a water inlet pipe and a water outlet pipe, and the water inlet pipe and the water outlet pipe are respectively connected to the water tank and the heat exchanger so as to supply water to and discharge water out of the heat exchanger.

[0065] Preferably, the water heater also includes a gas pipeline system and an air compressor. The gas pipeline system includes an air inlet pipe and an exhaust pipe. The two ends of the air inlet pipe are respectively connected to the airbag assembly and the air compressor. The air compressor can provide gas to the air inlet pipe to perform air intake operation to the airbag assembly; one end of the exhaust pipe is connected to the airbag assembly, and the other end is connected to the outside world to enable the airbag assembly to perform exhaust operation.

[0066] like Figure 1 As shown, under the premise of the above-mentioned setting, the control method for the water heater of the present application mainly includes:

[0067] S101. During the operation of the airbag assembly, obtain the water inlet temperature T of the water inlet pipe. wi and the outlet water temperature T wo For example, during the operation of the airbag assembly, the expansion and contraction of the airbag assembly can increase the turbulence of the water in the water tank, thereby improving the heat exchange efficiency of the water heater and enhancing the heat exchange effect; specifically, a water inlet temperature sensor is set on the water inlet pipe to detect the water inlet temperature T wi , which is conducive to accurately detecting the inlet water temperature T wi ; Set the outlet water temperature sensor on the outlet pipe to detect the outlet water temperature T wo , which is conducive to accurately detecting the outlet water temperature T wo .

[0068] S102, calculate the water temperature T wo With the inlet water temperature T wi For example, when the outlet water temperature T wo and inlet water temperature T wi Then calculate the outlet water temperature T wo With the inlet water temperature T wi The difference is taken as the temperature difference ΔT.

[0069] S103, determining the range of the temperature difference ΔT. For example, in practical applications, one or more preset temperature differences may be set. After the temperature difference ΔT is calculated, the range of the temperature difference ΔT is determined by comparing the temperature difference ΔT with the preset temperature differences.

[0070] S104. Determine the operating mode of the airbag assembly according to the range where the temperature difference ΔT is located. For example, there are multiple operating modes for the airbag assembly, such as the first operating mode, the second operating mode, the third operating mode, etc. When the airbag assembly adopts different operating modes, the corresponding ventilation cycles are different; after determining the range where the temperature difference ΔT is located, determine the operating mode of the airbag assembly according to the range where the temperature difference ΔT is located.

[0071] S105. Adjust the ventilation cycle of the airbag assembly according to the determined operating mode. For example, after determining the operating mode of the airbag assembly, control the airbag assembly to adjust the ventilation cycle of the airbag assembly according to this operating mode.

[0072] Preferably, the ventilation cycle of the airbag assembly includes an intake period Ta and an exhaust period Tb that operate alternately; where the intake period Ta is the time for the airbag assembly to perform one intake operation, and the exhaust period Tb is the time for the airbag assembly to perform one exhaust operation.

[0073] It should be noted that the intake period Ta and the exhaust period Tb in this application are not fixed, and those skilled in the art can adjust them flexibly according to the actual situation. For example, the intake period Ta and the exhaust period Tb are the same and both are 60 s; or, the intake period Ta and the exhaust period Tb are different, the intake period Ta is 60 s, and the exhaust period Tb is 65 s.

[0074] It is worth mentioning that the ventilation cycle of the airbag assembly in this application is inversely correlated with the speed of expansion and contraction of the airbag assembly. Specifically, when the ventilation cycle (intake period Ta and exhaust period Tb) of the airbag assembly is extended, since the volume change amount of expansion and the volume change amount of contraction of the airbag assembly remain unchanged, the speed of expansion and contraction of the airbag assembly will be reduced; when the ventilation cycle (intake period Ta and exhaust period Tb) of the airbag assembly is shortened, since the volume change amount of expansion and the volume change amount of contraction of the airbag assembly remain unchanged, the speed of expansion and contraction of the airbag assembly will be increased.

[0075] In one implementation, the step of "determine the operating mode of the airbag assembly according to the range where the temperature difference ΔT is located" further includes:

[0076] If ΔT < A, control the airbag assembly to operate in the first operating mode;

[0077] If A ≤ ΔT < B, control the airbag assembly to operate in the second operating mode;

[0078] If ΔT ≥ B, control the airbag assembly to operate in the third operating mode;

[0079] Where A is the first preset temperature difference and B is the second preset temperature difference, and A < B.

[0080] It should be noted that the value of the first preset temperature difference A in the present application is not fixed, and those skilled in the art can flexibly adjust it according to actual conditions. For example, the first preset temperature difference A is 2°C.

[0081] It should also be noted that the value of the second preset temperature difference B in the present application is not fixed, and those skilled in the art can flexibly adjust it according to actual conditions. For example, the second preset temperature difference B is 5°C.

[0082] For example, take A = 2 ° C, B = 5 ° C as an example. During the operation of the airbag component, if the T wi =36℃、T wo =37℃, calculated ΔT=1℃, at this time ΔT<2℃, indicating that the outlet water temperature T wo With the inlet water temperature T wi The temperature difference ΔT is small and the heat exchange effect is poor, then the airbag assembly is controlled to operate in the first operating mode; if the obtained T wi =36℃、T wo =40℃, calculated ΔT=4℃, at this time 2℃≤ΔT<5℃, indicating that the outlet water temperature T wo With the inlet water temperature T wi If the temperature difference ΔT is large and the heat exchange effect is good, the airbag assembly is controlled to operate in the second operating mode; if the obtained T wi =36℃、T wo =42℃, the calculated ΔT=6℃, at this time ΔT≥5℃, indicating that the outlet water temperature T wo With the inlet water temperature T wi If the temperature difference ΔT is too large and the heat exchange effect is excessive, the airbag assembly is controlled to operate in the third operating mode.

[0083] In one embodiment, when the airbag assembly operates in the first operating mode, the control method includes:

[0084] The airbag assembly continues to operate for the first set time t1, and the water inlet temperature T is obtained again. wi and outlet water temperature T wo ;

[0085] Calculate the water temperature T wo With the inlet water temperature T wi Temperature difference ΔT;

[0086] Determine the temperature difference ΔT and the first preset temperature difference A and the second preset temperature difference B;

[0087] According to the first judgment result, the ventilation cycle of the airbag assembly is adjusted.

[0088] It should be noted that the value of the first set time t1 in this application is not fixed, and those skilled in the art can adjust it flexibly according to the actual situation. For example, the first set time t1 is 10 min.

[0089] Specifically, in one implementation, the step of "adjusting the ventilation cycle of the airbag assembly according to the first judgment result" further includes:

[0090] When ΔT < A, shorten the ventilation cycle of the airbag assembly and extend the operation duration of the ventilation cycle of the airbag assembly.

[0091] That is to say, shorten the duration of the intake period Ta and the exhaust period Tb of the airbag assembly, and extend the duration of the first set time t1 of the operation of the ventilation cycle of the airbag assembly.

[0092] Furthermore, the change amount between the duration of the intake period before adjustment and the duration of the intake period after adjustment of the airbag assembly is the adjustment amount ΔTa of the intake period; similarly, the change amount between the duration of the exhaust period before adjustment and the duration of the exhaust period after adjustment of the airbag assembly is the adjustment amount ΔTb of the exhaust period.

[0093] Furthermore, the change amount between the first set time before adjustment and the first set time after adjustment is the adjustment amount Δt1 of the first set time.

[0094] It should be noted that the adjustment amounts ΔTa of the intake period and ΔTb of the exhaust period in this application are not fixed, and those skilled in the art can adjust them flexibly according to the actual situation. Specifically, taking the intake period Ta and the exhaust period Tb before adjustment as 60 s for example, if the adjustment amounts ΔTa of the intake period and ΔTb of the exhaust period are the same and both are 10 s, then the intake period Ta after adjustment is 50 s and the exhaust period Tb after adjustment is 50 s; for another example, if the adjustment amounts ΔTa of the intake period and ΔTb of the exhaust period are different, the adjustment amount of the intake period is 10 s and the adjustment amount of the exhaust period is 8 s, then the intake period Ta after adjustment is 50 s and the exhaust period Tb after adjustment is 52 s.

[0095] It should also be noted that the adjustment amount Δt1 of the first set time in this application is not fixed, and those skilled in the art can adjust it flexibly according to the actual situation. For example, taking the first set time t1 = 10 min before adjustment as an example, if the adjustment amount Δt1 of the first set time is 2 min, then the first set time t1 after adjustment is 12 min.

[0096] For example, when the airbag assembly operates in the first operating mode, taking A = 2°C, B = 5°C, t1 = 10 min, Ta = 60 s, Tb = 60 s, ΔTa = 10 s, ΔTb = 10 s, Δt1 = 2 min as an example, after the airbag assembly operates continuously for 10 min, the inlet water temperature T is obtained again. wi and the outlet water temperature T wo . If the obtained T wi = 36°C and T wo = 37.5°C, and the calculated ΔT = 1.5°C. At this time, ΔT < 2°C, indicating that the heat exchange effect is poor. The expansion and contraction speed of the airbag assembly during the current ventilation cycle cannot generate sufficient turbulence effect on the water in the water tank to improve the heat exchange efficiency. Then, shorten the ventilation cycle of the airbag assembly and extend the operation duration of the ventilation cycle of the airbag assembly, that is, shorten the duration of the intake period Ta and the exhaust period Tb of the airbag assembly, and extend the duration of the first set time t1 of the operation of the ventilation cycle of the airbag assembly, so as to accelerate the expansion and contraction speed of the airbag assembly and increase the turbulence degree of the water in the water tank to achieve the effect of improving the heat exchange effect; specifically, control the intake period Ta of the airbag assembly to be adjusted from 60 s to 50 s, the exhaust period Tb to be adjusted from 60 s to 50 s, and the first set time t1 of the operation of the ventilation cycle of the airbag assembly to be adjusted from 10 min to 12 min; after that, when the airbag assembly operates continuously for 12 min, if the obtained ΔT is still less than 2°C, it means that the airbag assembly operating with the adjusted ventilation cycle still cannot generate sufficient turbulence effect on the water in the water tank, then continue to shorten the duration of the intake period Ta and the exhaust period Tb of the airbag assembly, and extend the duration of the first set time t1 of the operation of the ventilation cycle of the airbag assembly; specifically, control the intake period Ta of the airbag assembly to be adjusted from 50 s to 40 s, the exhaust period Tb to be adjusted from 50 s to 40 s, and the first set time t1 of the operation of the ventilation cycle of the airbag assembly to be adjusted from 12 min to 14 min; and cycle in this way until ΔT is greater than or equal to 2°C.

[0097] Furthermore, the step of "adjusting the ventilation cycle of the airbag assembly according to the first judgment result" further includes:

[0098] When A ≤ ΔT < B, obtain the current ventilation cycle of the airbag assembly;

[0099] After controlling the airbag assembly to operate for the second set time t2 with the current ventilation cycle, obtain the inlet water temperature T wi and the outlet water temperature T wo again;

[0100] Calculate the temperature difference ΔT between the outlet water temperature T wo and the inlet water temperature T wi ;

[0101] Determine the magnitudes of the temperature difference ΔT, the first preset temperature difference A, and the second preset temperature difference B;

[0102] If A ≤ ΔT < B, then control the airbag assembly to maintain the current ventilation cycle operation;

[0103] If ΔT ≥ B, then extend the ventilation cycle of the airbag assembly and shorten the operation duration of the ventilation cycle of the airbag assembly.

[0104] That is to say, extend the intake period Ta and the exhaust period Tb of the airbag assembly, and shorten the duration of the second set time t2 of the operation of the ventilation cycle of the airbag assembly.

[0105] Preferably, the second set time t2 is 10 min; it can be understood that those skilled in the art can adjust the second set time t2 according to the actual situation. For example, t2 is 9 min, 12 min, or 15 min, etc. Among them, the second set time t2 and the first set time t1 can be the same or different.

[0106] Furthermore, the change amount between the second set time before adjustment and the second set time after adjustment is the adjustment amount Δt2 of the second set time.

[0107] It should be noted that the adjustment amount Δt2 of the second set time in this application is not fixed, and those skilled in the art can flexibly adjust it according to the actual situation. For example, taking the second set time t2 = 10 min before adjustment as an example, if the adjustment amount Δt2 of the second set time is 2 min, then the second set time t2 after adjustment is 8 min.

[0108] For example, taking A = 2 °C, B = 5 °C, t2 = 10 min, Ta = 60 s, Tb = 60 s, ΔTa = 10 s, ΔTb = 10 s, Δt2 = 2 min as an example for illustration. After the airbag assembly operates continuously for 10 min, obtain the inlet water temperature T again wi and the outlet water temperature T wo , if the obtained T wi = 36 °C, T wo = 39 °C, calculate to obtain ΔT = 3 °C. At this time, 2 °C ≤ ΔT < 5 °C, indicating that the heat exchange effect is good. The expansion and contraction speeds of the airbag assembly during operation with the current ventilation cycle can cause sufficient turbulence in the water in the water tank to improve the heat exchange efficiency. Then obtain the current ventilation cycle of the airbag assembly; after controlling the airbag assembly to operate with the current ventilation cycle for 10 min, obtain the inlet water temperature T again wi and the outlet water temperature T wo , if the obtained T wi = 36 °C, T wo= 40°C, it is calculated that ΔT = 4°C. At this time, 2°C ≤ ΔT < 5°C, indicating that the heat exchange effect is good. The expansion and contraction speed of the airbag assembly during the current ventilation cycle can cause sufficient turbulence in the water in the water tank to improve the heat exchange efficiency. Then, control the airbag assembly to maintain the current ventilation cycle; if the obtained T wi = 36°C, T wo = 41°C, it is calculated that ΔT = 5°C. At this time, ΔT ≥ 5°C, indicating that the heat exchange effect is excessive. The expansion and contraction speed of the airbag assembly during the current ventilation cycle can cause sufficient and surplus turbulence in the water in the water tank to improve the heat exchange efficiency. To save energy as much as possible, extend the ventilation cycle of the airbag assembly and shorten the operation duration of the ventilation cycle of the airbag assembly, that is, extend the intake period Ta and the exhaust period Tb of the airbag assembly, and shorten the second set time t2 of the operation of the ventilation cycle of the airbag assembly; specifically, control the intake period Ta of the airbag assembly to be adjusted from 60 s to 70 s, the exhaust period Tb to be adjusted from 60 s to 70 s, and the second set time t2 of the operation of the ventilation cycle of the airbag assembly to be adjusted from 10 min to 8 min; then, when the airbag assembly continues to operate for 8 min, if the obtained ΔT is still greater than or equal to 5°C, it indicates that the airbag assembly can still cause sufficient and surplus turbulence in the water in the water tank when operating with the adjusted ventilation cycle. Then, continue to extend the intake period Ta and the exhaust period Tb of the airbag assembly, and shorten the second set time t2 of the operation of the ventilation cycle of the airbag assembly; specifically, control the intake period Ta of the airbag assembly to be adjusted from 70 s to 80 s, the exhaust period Tb to be adjusted from 70 s to 80 s, and the second set time t2 of the operation of the ventilation cycle of the airbag assembly to be adjusted from 8 min to 6 min; and cycle in this way until ΔT is less than 5°C.

[0109] Further, the step of "adjusting the ventilation cycle of the airbag assembly according to the first judgment result" further includes:

[0110] When ΔT ≥ B, obtain the current ventilation cycle of the airbag assembly;

[0111] Control the airbag assembly to operate for a third set time t3 with the current ventilation cycle, and then obtain the inlet water temperature T wi and the outlet water temperature T wo ;

[0112] Calculate the temperature difference ΔT between the outlet water temperature T wo and the inlet water temperature T wi ;

[0113] Judge the magnitude of the temperature difference ΔT and the second preset temperature difference B;

[0114] If ΔT < B, control the airbag assembly to maintain the current ventilation cycle;

[0115] If ΔT≥B, the ventilation cycle of the airbag assembly is extended and the running time of the ventilation cycle of the airbag assembly is shortened.

[0116] That is, the duration of the air intake period Ta and the air exhaust period Tb of the airbag module is extended, and the duration of the third set time t3 of the airbag module ventilation cycle operation is shortened.

[0117] Preferably, the third set time t3 is 10 minutes. It is understood that those skilled in the art can adjust the third set time t3 according to actual conditions, for example, t3 is 9 minutes, 12 minutes, or 15 minutes. The third set time t3 can be the same as or different from the first set time t1 and the second set time t2; or the third set time t3 can be the same as either the first set time t1 or the second set time t2.

[0118] Furthermore, the difference between the third set time before adjustment and the third set time after adjustment is the adjustment amount Δt3 of the third set time.

[0119] It should be noted that the adjustment amount Δt3 for the third set time is not fixed in this application and can be flexibly adjusted by those skilled in the art based on actual circumstances. For example, taking the third set time t3 before adjustment as 10 minutes, and the adjustment amount Δt3 of the third set time is 2 minutes, the adjusted third set time t3 is 8 minutes.

[0120] For example, take A = 2 ° C, B = 5 ° C, t3 = 10 min, Ta = 60 s, Tb = 60 s, ΔTa = 10 s, ΔTb = 10 s, Δt3 = 2 min as an example. After the airbag assembly runs continuously for 10 minutes, the water inlet temperature T is obtained again. wi and outlet water temperature T wo , if the obtained T wi =36℃、T wo =42℃, and ΔT=6℃ is calculated. At this time, ΔT≥5℃, indicating that the heat exchange effect is excessive. The expansion and contraction speed of the airbag component when running at the current ventilation cycle can make the water in the water tank produce sufficient and residual turbulence effect to improve the heat exchange efficiency. In order to save energy as much as possible, the current ventilation cycle of the airbag component is obtained; after the airbag component is controlled to run at the current ventilation cycle for 10 minutes, the water inlet temperature T is obtained again. wi and outlet water temperature T wo , if the obtained T wi =36℃、T wo=40℃, ΔT=4℃ is calculated. At this time, ΔT<5℃, which means the heat exchange effect is good. The expansion and contraction speed of the airbag component during the current ventilation cycle can make the water in the water tank produce enough turbulence to improve the heat exchange efficiency. The airbag component is controlled to maintain the current ventilation cycle. If the obtained T wi =36℃、T wo =41.5℃, and ΔT=5.5℃ is calculated. At this time, ΔT≥5℃, which means that the heat exchange effect is excessive. The expansion and contraction speed of the airbag component during the current ventilation cycle can make the water in the water tank produce sufficient and residual turbulence effect to improve the heat exchange efficiency. In order to save energy as much as possible, the ventilation cycle of the airbag component is extended, and the running time of the ventilation cycle of the airbag component is shortened, that is, the duration of the intake period Ta and the exhaust period Tb of the airbag component is extended, and the duration of the third set time t3 of the ventilation cycle of the airbag component is shortened; specifically, the intake period Ta of the airbag component is controlled to be adjusted from 60s to 70s, the exhaust period Tb is adjusted from 60s to 70s, and the third setting time t3 of the ventilation cycle of the airbag component is adjusted from 60s to 70s. The time t3 is adjusted from 10min to 8min; thereafter, when the airbag assembly has been running for 8min, if the obtained ΔT is still greater than or equal to 5°C, it means that the airbag assembly can still produce sufficient and residual turbulence effect on the water in the water tank when running with the adjusted ventilation cycle, then the duration of the airbag assembly's intake period Ta and exhaust period Tb will continue to be extended, and the duration of the third set time t3 of the airbag assembly's ventilation cycle will be shortened; specifically, the airbag assembly's intake period Ta is controlled to be adjusted from 70s to 80s, the exhaust period Tb is adjusted from 70s to 80s, and the third set time t3 of the airbag assembly's ventilation cycle is adjusted from 8min to 6min; and this cycle is repeated until ΔT is less than 5°C.

[0121] In one embodiment, when the airbag assembly operates in the second operating mode, the control method includes:

[0122] Control the airbag assembly to maintain the current ventilation cycle.

[0123] For example, when the airbag assembly operates in the second operating mode, the airbag assembly is controlled to maintain the current ventilation cycle.

[0124] In one embodiment, when the airbag assembly operates in the third operating mode, the control method includes:

[0125] After the airbag assembly is kept running for the fourth set time t4, the water inlet temperature T is obtained again. wi and outlet water temperature T wo ;

[0126] Calculate the water temperature T wo and inlet water temperature T wi Temperature difference ΔT;

[0127] Determine the magnitude relationship between the temperature difference ΔT and the second preset temperature difference B;

[0128] Adjust the ventilation cycle of the airbag assembly according to the second judgment result.

[0129] Preferably, the fourth set time t4 is 10 min; it can be understood that those skilled in the art can adjust the fourth set time t4 according to the actual situation. For example, t4 can be 9 min, 12 min, or 15 min, etc. Among them, the fourth set time t4 and the first set time t1, the second set time t2, and the third set time t3 can be the same or different; or the fourth set time t4 and any one or any two of the first set time t1, the second set time t2, and the third set time t3 can be the same.

[0130] Specifically, in one implementation, the step of "adjusting the ventilation cycle of the airbag assembly according to the second judgment result" further includes:

[0131] If ΔT < B, then control the airbag assembly to maintain the current ventilation cycle operation;

[0132] If ΔT ≥ B, then extend the ventilation cycle of the airbag assembly and shorten the operation duration of the ventilation cycle of the airbag assembly.

[0133] That is to say, extend the duration of the intake period Ta and the exhaust period Tb of the airbag assembly, and shorten the duration of the fourth set time t4 of the operation of the ventilation cycle of the airbag assembly.

[0134] Further, the change amount between the fourth set time before adjustment and the fourth set time after adjustment is the adjustment amount Δt4 of the fourth set time.

[0135] It should be noted that the adjustment amount Δt4 of the fourth set time in this application is not fixed, and those skilled in the art can adjust it flexibly according to the actual situation. For example, taking the fourth set time t4 = 10 min before adjustment as an example, if the adjustment amount Δt4 of the fourth set time is 2 min, then the fourth set time t4 after adjustment is 8 min.

[0136] For example, when the airbag assembly operates in the third operation mode, taking A = 2 °C, B = 5 °C, t1 = 10 min, t4 = 10 min, Ta = 60 s, Tb = 60 s, ΔTa = 10 s, ΔTb = 10 s, Δt1 = 2 min as an example for illustration, after the airbag assembly continuously operates for 10 min, obtain the inlet water temperature T again wi and the outlet water temperature T wo , if the obtained T wi = 36 °C, T wo=43℃, ΔT=7℃ is calculated. At this time, ΔT≥5℃, indicating that the heat exchange effect is excessive. The expansion and contraction speed of the airbag component when running at the current ventilation cycle can make the water in the water tank produce sufficient and residual turbulence effect to improve the heat exchange efficiency. Then, the current ventilation cycle of the airbag component is obtained; after the airbag component is controlled to run at the current ventilation cycle for 10 minutes, the water inlet temperature T is obtained again. wi and outlet water temperature T wo , if the obtained T wi =36℃、T wo =40℃, ΔT=4℃ is calculated. At this time, ΔT<5℃, which means the heat exchange effect is good. The expansion and contraction speed of the airbag component during the current ventilation cycle can make the water in the water tank produce enough turbulence to improve the heat exchange efficiency. The airbag component is controlled to maintain the current ventilation cycle. If the obtained T wi =36℃、T wo =42℃, and ΔT=6℃ is calculated. At this time, ΔT≥5℃, which means that the heat exchange effect is excessive. The expansion and contraction speed of the airbag component during the current ventilation cycle can make the water in the water tank produce sufficient and residual turbulence effect to improve the heat exchange efficiency. In order to save energy as much as possible, the ventilation cycle of the airbag component is extended, and the running time of the ventilation cycle of the airbag component is shortened, that is, the duration of the intake period Ta and the exhaust period Tb of the airbag component is extended, and the duration of the fourth set time t4 of the ventilation cycle of the airbag component is shortened; specifically, the intake period Ta of the airbag component is controlled to be adjusted from 60s to 70s, the exhaust period Tb is adjusted from 60s to 70s, and the fourth set time t4 of the ventilation cycle of the airbag component is adjusted from 60s to 70s. The time t4 is adjusted from 10min to 8min; thereafter, when the airbag assembly has been running for 8min, if the obtained ΔT is still greater than 5°C, it means that the airbag assembly can still generate sufficient and residual turbulence effect for the water in the water tank when running with the adjusted ventilation cycle, then the duration of the airbag assembly's intake period Ta and exhaust period Tb will continue to be extended, and the duration of the fourth set time t4 of the airbag assembly's ventilation cycle will be shortened; specifically, the airbag assembly's intake period Ta is controlled to be adjusted from 70s to 80s, the exhaust period Tb is adjusted from 70s to 80s, and the fourth set time t4 of the airbag assembly's ventilation cycle is adjusted from 8min to 6min; and this cycle is repeated until ΔT is less than 5°C.

[0137] The following combination Figure 4 , a possible operation process of the air conditioner of the present invention is briefly described. Figure 4 It is a logic diagram of a possible implementation of the control method for a water heater of the present invention.

[0138] like Figure 4 As shown, in one possible operation process:

[0139] S201, during the operation of the airbag assembly, obtain the water inlet temperature T wi and outlet water temperature T wo , then execute S202.

[0140] S202, calculate the water temperature T wo and inlet water temperature T wi The temperature difference ΔT is calculated, and then S203 is executed.

[0141] S203, determine the temperature difference ΔT and the size of 2°C and 5°C:

[0142] If ΔT<2°C, execute S204;

[0143] If 2°C ≤ ΔT < 5°C, execute S205;

[0144] If ΔT≥5°C, execute S206.

[0145] S204: Control the airbag assembly to operate in the first operating mode, and then execute S207.

[0146] S205: Control the airbag assembly to operate in the second operating mode, and then execute S227.

[0147] S206 , control the airbag assembly to operate in the third operating mode, and then execute S228 .

[0148] S207 , control the airbag assembly to operate in the first operating mode for 10 minutes, and then execute S208 .

[0149] S208, obtain the water inlet temperature T again wi and outlet water temperature T wo , then execute S209.

[0150] S209, calculate the water temperature T wo and inlet water temperature T wi The temperature difference ΔT is calculated, and then S210 is executed.

[0151] S210, determine the size of the temperature difference ΔT and 2°C and 5°C:

[0152] If ΔT<2°C, execute S211;

[0153] If 2°C ≤ ΔT < 5°C, execute S213;

[0154] If ΔT≥5°C, execute S220.

[0155] S211. Shorten the ventilation cycle of the airbag assembly and extend the running time of the ventilation cycle of the airbag assembly, and then execute S212.

[0156] S212: Control the airbag assembly to continuously operate for the adjusted operating time with the adjusted ventilation cycle, and then return to S208.

[0157] S213: Obtain the current ventilation cycle of the airbag assembly, and then execute S214.

[0158] S214, control the airbag assembly to run for 10 minutes at the current ventilation cycle, and then obtain the water inlet temperature T again. wi and outlet water temperature T wo , then execute S215.

[0159] S215, calculate the water temperature T wo With the inlet water temperature T wi The temperature difference ΔT is calculated, and then S216 is executed.

[0160] S216: Determine whether 2°C ≤ ΔT < 5°C. If so, execute S217; if not, execute S218.

[0161] S217: Control the airbag assembly to maintain the current ventilation cycle.

[0162] S218, extend the ventilation cycle of the airbag assembly and shorten the running time of the ventilation cycle of the airbag assembly; then execute S219.

[0163] S219: Control the airbag assembly to continue running for the adjusted running time with the adjusted ventilation cycle, and then return to execute S208.

[0164] S220: Obtain the current ventilation cycle of the airbag assembly, and then execute S221.

[0165] S221, control the airbag component to run for 10 minutes at the current ventilation cycle, and then obtain the water inlet temperature T again. wi and outlet water temperature T wo , then execute S222.

[0166] S222, calculate the water temperature T wo With the inlet water temperature T wi The temperature difference ΔT is calculated, and then S223 is executed.

[0167] S223. Determine whether ΔT ≥ 5°C. If not, execute S224; if so, execute S225.

[0168] S224: Control the airbag assembly to maintain the current ventilation cycle.

[0169] S225, extend the ventilation cycle of the airbag assembly and shorten the running time of the ventilation cycle of the airbag assembly; then execute S226.

[0170] S226: Control the airbag assembly to continue running at the adjusted ventilation cycle for the adjusted running time, and then return to execute S208.

[0171] S227. Control the airbag assembly to maintain the current ventilation cycle.

[0172] S228: Control the airbag assembly to operate in the third operating mode for 10 minutes, and then execute S229.

[0173] S229, obtain the water inlet temperature T again wi and outlet water temperature T wo , then execute S230.

[0174] S230, calculate the water temperature T wo With the inlet water temperature T wi The temperature difference ΔT is calculated, and then S231 is executed.

[0175] S231. Determine whether ΔT ≥ 5°C. If not, execute S232; if so, execute S233.

[0176] S232: Control the airbag assembly to maintain the current ventilation cycle.

[0177] S233, extend the ventilation cycle of the airbag assembly and shorten the running time of the ventilation cycle of the airbag assembly; then execute S234.

[0178] S234: Control the airbag assembly to continue running for the adjusted operating time with the adjusted ventilation cycle, and then return to execute S229.

[0179] Those skilled in the art will appreciate that although some embodiments described herein include certain features included in other embodiments but not other features, combinations of features from different embodiments are intended to be within the scope of this application and to form different embodiments. For example, in the claims of this application, any of the claimed embodiments may be used in any combination.

[0180] It should be noted that although the detailed steps of the method of the present application are described in detail above, without departing from the basic principles of the present application, technical personnel in this field can combine, split and change the order of the above steps. The modified technical solution does not change the basic concept of the present application and therefore falls within the scope of protection of the present application.

[0181] Thus far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art may make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will fall within the scope of protection of the present invention.

Claims

1. A control method for a water heater, characterized in that: The water heater includes a water tank, an airbag assembly, a heat exchanger, and a liquid pipeline system; the airbag assembly is arranged in the water tank; the liquid pipeline system includes a water inlet pipe and a water outlet pipe, and the water inlet pipe and the water outlet pipe are respectively connected to the water tank and the heat exchanger to supply water to and discharge water from the heat exchanger; The control method includes the following steps: During the operation of the airbag assembly, the water inlet temperature T of the water inlet pipe is obtained. wi and the outlet water temperature T of the outlet pipe wo ; Calculate the outlet water temperature T wo With the water inlet temperature T wi Temperature difference ΔT; Judge which range the temperature difference ΔT is in; Determine the operation mode of the airbag assembly according to the range where the temperature difference ΔT is located; Adjust the ventilation cycle of the airbag assembly according to the determined operation mode.

2. The control method according to claim 1, characterized in that: The step of "determining the operation mode of the airbag assembly according to the range where the temperature difference ΔT is located" further includes: If ΔT < A, control the airbag assembly to operate in the first operation mode; If A ≤ ΔT < B, control the airbag assembly to operate in the second operation mode; If ΔT ≥ B, control the airbag assembly to operate in the third operation mode; Where A is the first preset temperature difference and B is the second preset temperature difference, and A < B.

3. The control method according to claim 2, characterized in that: When the airbag assembly operates in the first operation mode, the control method includes: The airbag assembly continues to operate for the first set time t1, and the water inlet temperature T is obtained again. wi and the outlet water temperature T wo ; Calculate the outlet water temperature T wo With the water inlet temperature T wi Temperature difference ΔT; Judge the magnitudes of the temperature difference ΔT, the first preset temperature difference A, and the second preset temperature difference B; Adjust the ventilation cycle of the airbag assembly according to the first judgment result.

4. The control method according to claim 3, characterized in that: The step of "adjusting the ventilation cycle of the airbag assembly according to the first judgment result" further includes: When ΔT < A, shorten the ventilation cycle of the airbag assembly and extend the operation duration of the ventilation cycle of the airbag assembly.

5. The control method according to claim 4, characterized in that: The step of "adjusting the ventilation cycle of the airbag assembly according to the first judgment result" further includes: When A ≤ ΔT < B, obtain the current ventilation cycle of the airbag assembly; After controlling the airbag assembly to run for the second set time t2 in the current ventilation cycle, the water inlet temperature T is obtained again. wi and the outlet water temperature T wo ; Calculate the outlet water temperature T wo With the water inlet temperature T wi Temperature difference ΔT; Judge the magnitudes of the temperature difference ΔT, the first preset temperature difference A, and the second preset temperature difference B; If A ≤ ΔT < B, control the airbag assembly to maintain the current ventilation cycle operation; If ΔT ≥ B, extend the ventilation cycle of the airbag assembly and shorten the operation duration of the ventilation cycle of the airbag assembly.

6. The control method according to claim 5, characterized in that: The step of "adjusting the ventilation cycle of the airbag assembly according to the first judgment result" further includes: When ΔT ≥ B, obtain the current ventilation cycle of the airbag assembly; After controlling the airbag assembly to operate for the third set time t3 in the current ventilation cycle, the water inlet temperature T is obtained again. wi and the outlet water temperature T wo ; Calculate the outlet water temperature T wo With the water inlet temperature T wi Temperature difference ΔT; Judge the magnitude of the temperature difference ΔT and the second preset temperature difference B; If ΔT < B, control the airbag assembly to maintain the current ventilation cycle operation; If ΔT ≥ B, extend the ventilation cycle of the airbag assembly and shorten the operation duration of the ventilation cycle of the airbag assembly.

7. The control method according to claim 2, characterized in that: When the airbag assembly operates in the second operation mode, the control method includes: Control the airbag assembly to maintain the current ventilation cycle operation.

8. The control method according to claim 2, characterized in that: When the airbag assembly operates in the third operation mode, the control method includes: After the airbag assembly is kept running for a fourth set time t4, the water inlet temperature T is obtained again. wi and the outlet water temperature T wo ; Calculate the outlet water temperature T wo With the inlet water temperature T wi Temperature difference ΔT; Judge the magnitude of the temperature difference ΔT and the second preset temperature difference B; Adjust the ventilation cycle of the airbag assembly according to the second judgment result.

9. The control method according to claim 8, characterized in that: The step of "adjusting the ventilation cycle of the airbag assembly according to the second judgment result" further includes: If ΔT ≥ B, extend the ventilation cycle of the airbag assembly and shorten the operation duration of the ventilation cycle of the airbag assembly.

10. The control method according to any one of claims 1 to 9, characterized in that: The ventilation cycle includes an intake period Ta and an exhaust period Tb that operate alternately; The air intake period Ta is the time it takes for the airbag assembly to perform one air intake operation, and the air exhaust period Tb is the time it takes for the airbag assembly to perform one air exhaust operation.

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