Fan control method and device of heat pump hot water unit and heat pump hot water unit

Abstract

The invention relates to the technical field of heat pumps, and provides a fan control method and device of a heat pump hot water unit and the heat pump hot water unit. Outdoor unit side saturation temperature corresponding to the indoor unit side target working parameters is determined; the current temperature difference value of the outdoor unit side saturation temperature and the current environment temperature is determined; and adjusting the rotating speed of the fan based on the current temperature difference value. The current temperature difference value between the saturation temperature of the outdoor unit side and the current environment temperature is determined, the current temperature difference value serves as the control parameter in the fan rotating speed control process, the rotating speed of the fan is adjusted, the heat dissipation demand of the outdoor condenser is matched with the actual output heat dissipation amount of the fan, unnecessary electric energy consumption is avoided, and the energy consumption is reduced. The energy efficiency ratio of the whole system is improved, and the problem that the energy efficiency ratio of the system is reduced due to energy consumption waste in the prior art is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of heat pumps, and particularly to a fan control method, a control device and a heat pump water heater unit for a heat pump water heater unit. Background Art

[0002] The main function of a heat pump water heater unit is to utilize the refrigerant flow and phase change characteristics in the heat pump cycle to absorb low-temperature heat from the outdoor environment, and through the processes of compression and heat release, upgrade the low-temperature heat to high-temperature heat for indoor heating or hot water supply. The fan in the heat pump water heater unit is a key component in the system. The fan is usually installed in the outdoor unit of the heat pump and is responsible for accelerating the air flow on the surface of the heat exchanger, generally helping to dissipate heat through forced convection to ensure that the heat pump system can effectively absorb or release heat, thereby improving the heat exchange efficiency.

[0003] Currently, the heat pump water heater unit operates and is controlled according to the original air-conditioning fluorine machine system, which has the defect of energy consumption waste and reduces the overall energy efficiency ratio of the system. Summary of the Invention

[0004] The present invention provides a fan control method, a control device and a heat pump water heater unit to solve the problem of energy consumption waste in the prior art that reduces the energy efficiency ratio of the system, and realizes the adjustment of the fan speed, so that the heat dissipation demand of the outdoor condenser matches the actual heat dissipation output of the fan, and improves the energy efficiency ratio of the system.

[0005] The present invention provides a fan control method for a heat pump water heater unit, including: Obtaining the current ambient temperature; Determining the saturation temperature on the outdoor unit side corresponding to the target operating parameter on the indoor unit side; Determining the current temperature difference value between the saturation temperature on the outdoor unit side and the current ambient temperature; Adjusting the speed of the fan based on the current temperature difference value.

[0006] According to the fan control method for a heat pump water heater unit provided by the present invention, the adjusting the speed of the fan based on the current temperature difference value includes: Matching the current temperature difference value with a preset data table to determine the adjustment gear number corresponding to the current temperature difference value; different temperature difference value intervals and corresponding adjustment gear numbers are included in the preset data table; Adjusting the speed of the fan based on the adjustment gear number.

[0007] According to the fan control method for a heat pump water heater unit provided by the present invention, the determining the saturation temperature on the outdoor unit side corresponding to the target operating parameter on the indoor unit side includes: When the heat pump water heater unit is in the heating mode, determining the target high-pressure pressure saturation temperature corresponding to the target operating parameter on the indoor unit side; Determine the low-pressure pressure saturation temperature based on the target high-pressure pressure saturation temperature; Determine the outdoor unit side saturation temperature as the low-pressure pressure saturation temperature; The determining the current temperature difference value between the outdoor unit side saturation temperature and the current ambient temperature includes: Subtract the outdoor unit side saturation temperature from the current ambient temperature to obtain the current temperature difference value.

[0008] According to a fan control method of a heat pump water heater provided by the present invention, the adjusting the rotational speed of the fan based on the current temperature difference value includes: Compare the current temperature difference value with the target temperature difference; When the current temperature difference value is less than the target temperature difference, increase the rotational speed of the fan; When the current temperature difference value is greater than the target temperature difference, decrease the rotational speed of the fan.

[0009] According to a fan control method of a heat pump water heater provided by the present invention, the determining the outdoor unit side saturation temperature corresponding to the indoor unit side target operating parameter includes: When the heat pump water heater is in the cooling mode, determine the target low-pressure pressure saturation temperature corresponding to the indoor unit side target operating parameter; Based on the target low-pressure pressure saturation temperature, determine the high-pressure pressure saturation temperature; Determine the high-pressure pressure saturation temperature as the outdoor unit side saturation temperature; The determining the current temperature difference value between the outdoor unit side saturation temperature and the current ambient temperature includes: Subtract the current ambient temperature from the outdoor unit side saturation temperature to obtain the current temperature difference value.

[0010] According to a fan control method of a heat pump water heater provided by the present invention, the adjusting the rotational speed of the fan based on the current temperature difference value includes: Compare the current temperature difference value with the target temperature difference; When the current temperature difference value is less than the target temperature difference, decrease the rotational speed of the fan; When the current temperature difference value is greater than the target temperature difference, increase the rotational speed of the fan.

[0011] The present invention also provides a fan control device for a heat pump water heater, including the following modules: An acquisition module, configured to acquire the current ambient temperature; A first determination module, configured to determine the outdoor unit side saturation temperature corresponding to the indoor unit side target operating parameter; A second determination module, configured to determine a current temperature difference value between the saturated temperature on the outdoor unit side and the current ambient temperature; An adjustment module, configured to adjust the rotational speed of the blower based on the current temperature difference value.

[0012] The present invention further provides a heat pump water heater, including a compressor, an indoor heat exchanger, an outdoor condenser, and a blower, and the rotational speed of the blower is adjusted by applying the blower control method of the heat pump water heater according to any one of the above.

[0013] According to a heat pump water heater provided by the present invention, a temperature measuring element is arranged on the outdoor condenser side.

[0014] The present invention further provides an electronic device, including a memory, a processor, and a computer program stored on the memory and executable on the processor, and when the processor executes the computer program, the blower control method of the heat pump water heater according to any one of the above is implemented.

[0015] The blower control method of the heat pump water heater provided by the present invention determines the current temperature difference value between the saturated temperature on the outdoor unit side and the current ambient temperature, and uses this current temperature difference value as a control parameter in the process of controlling the rotational speed of the blower, so as to realize the adjustment of the rotational speed of the blower, make the heat dissipation demand of the outdoor condenser match the actual heat dissipation output of the blower, thereby avoiding unnecessary power consumption and improving the energy efficiency ratio of the overall system. Description of the Drawings

[0016] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0017] Figure 1 It is a schematic structural diagram of the heat pump water heater provided by the present invention.

[0018] Figure 2 It is one of the schematic flowcharts of the blower control method of the heat pump water heater provided by the present invention.

[0019] Figure 3 It is another schematic flowchart of the blower control method of the heat pump water heater provided by the present invention.

[0020] Figure 4 It is a third schematic flowchart of the blower control method of the heat pump water heater provided by the present invention.

[0021] Figure 5 It is a fourth schematic flowchart of the blower control method of the heat pump water heater provided by the present invention.

[0022] Figure 6 It is a schematic diagram of the relationship between the fan speed and the ambient temperature in the heating mode provided by the present invention.

[0023] Figure 7 It is the fifth schematic flow diagram of the fan control method for a heat pump water heater provided by the present invention.

[0024] Figure 8 It is the sixth schematic flow diagram of the fan control method for a heat pump water heater provided by the present invention.

[0025] Figure 9 A schematic diagram of the relationship between the fan speed and the ambient temperature in the cooling mode provided by the present invention.

[0026] Figure 10 It is a schematic structural diagram of the fan control device for a heat pump water heater provided by the present invention.

[0027] Figure 11 It is a schematic structural diagram of the electronic device provided by the present invention.

[0028] Reference numerals: 10, compressor; 20, four-way valve; 30, outdoor condenser; 40, throttling device; 50, indoor heat exchanger; 60, water pump; 70, fan; 80, temperature measuring element. Detailed Embodiments

[0029] The following further describes in detail the embodiments of the present invention with reference to the drawings and examples. The following examples are used to illustrate the present invention, but cannot be used to limit the scope of the present invention.

[0030] In the description of the embodiments of the present invention, it should be noted that the orientation or positional relationships indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the embodiments of the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0031] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected, or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific situations.

[0032] In the embodiments of the present invention, unless otherwise clearly specified and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely means that the first feature has a higher horizontal height than the second feature. The first feature being "under", "below" and "beneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely means that the first feature has a lower horizontal height than the second feature.

[0033] In the description of this specification, the descriptions with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the embodiments of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0034] The following Figures 1-9 describes the fan control method of the heat pump water heater of the present invention.

[0035] As Figure 1As shown in the figure, the heat pump water heater unit includes a compressor 10, a four-way valve 20, an outdoor condenser 30, a throttling device 40, an indoor heat exchanger 50, a water pump 60 and a fan 70; the four-way valve 20 has a first port D, a second port E, a third port C and a fourth port S. The exhaust port of the compressor 10 is connected to the first port D, the suction port of the compressor 10 is connected to the fourth port S, the second port E is connected to the first refrigerant interface of the indoor heat exchanger 50, and the third port C is connected to the second refrigerant interface of the indoor heat exchanger 50 through the sequentially arranged outdoor condenser 30 and throttling device 40. The water inlet and outlet of the indoor heat exchanger 50 are communicated with accessories such as a water tank to realize a circulating water path. A water pump 60 is arranged at the water inlet of the indoor heat exchanger 50 to ensure the flow of water and the uniform distribution of heat.

[0036] The heat pump water heater unit usually works and is controlled according to the original air-conditioning fluorine machine system. In the refrigeration mode, it is controlled according to the saturation temperature corresponding to the target high pressure (high pressure saturation temperature). This control method ignores the influence of the saturation temperature corresponding to the low pressure (low pressure saturation temperature) at different ambient temperatures on the system control; and when the system is refrigerating, it is controlled according to the saturation temperature corresponding to the target low pressure. This control method also ignores the influence of the saturation temperature corresponding to the high pressure at different ambient temperatures on the system control, that is, when the heat pump water heater unit works and is controlled, the influence of the ambient temperature on the system control is ignored, resulting in a serious mismatch between the heat dissipation demand and the actual heat dissipation output of the fan 70, causing energy consumption waste, and further reducing the overall energy efficiency ratio of the system. Based on this, in the process of controlling the operation of the heat pump water heater unit of the present invention, the change of the ambient temperature is considered, and the rotation speed of the fan 70 is adjusted based on the ambient temperature to make the heat dissipation demand match the actual heat dissipation output of the fan 70.

[0037] An embodiment of the present invention proposes a fan control method for a heat pump water heater unit, as Figure 2 shown, the method includes the following steps: Step 100, obtain the current ambient temperature.

[0038] Step 200, determine the saturation temperature on the outdoor unit side corresponding to the target operating parameter on the indoor unit side.

[0039] Wherein, the target operating parameter on the indoor unit side can be the target pressure or target temperature on the indoor unit side; the target pressure or target temperature is reasonably designed according to the working requirements.

[0040] It can be understood that according to the target operating parameter on the indoor unit side, the saturation temperature on the indoor unit side corresponding to the target operating parameter on the indoor unit side is determined, and the corresponding saturation temperature on the outdoor unit side is obtained based on the saturation temperature on the indoor unit side.

[0041] Step 300, determine the current temperature difference value between the saturation temperature on the outdoor unit side and the current ambient temperature.

[0042] Step 400: Adjust the rotational speed of the fan based on the current temperature difference value.

[0043] It can be understood that the current temperature difference value between the saturation temperature on the outdoor unit side and the current ambient temperature is calculated, and the rotational speed of the fan is adjusted based on this temperature difference so that the heat dissipation demand of the outdoor condenser matches the actual heat dissipation output of the fan.

[0044] The fan control method of the heat pump water heater provided by the embodiment of the present invention determines the current temperature difference value between the saturation temperature on the outdoor unit side and the current ambient temperature, and uses this current temperature difference value as the control parameter in the process of controlling the rotational speed of the fan, thereby realizing the adjustment of the rotational speed of the fan, making the heat dissipation demand of the outdoor condenser match the actual heat dissipation output of the fan, thus avoiding unnecessary power consumption and improving the energy efficiency ratio of the overall system.

[0045] In an embodiment of the present invention, as Figure 3 shown, Step 400: Adjust the rotational speed of the fan based on the current temperature difference value, specifically includes the following steps: Step 410: Match the current temperature difference value with a preset data table to determine the adjustment gear number corresponding to the current temperature difference value.

[0046] Wherein, the preset data table includes the adjustment gear numbers corresponding to different temperature difference value ranges.

[0047] Specifically, the preset data table includes multiple different temperature difference value ranges, each temperature difference value range corresponds to an adjustment gear number, so that the preset data table has multiple different temperature difference value ranges and corresponding multiple adjustment gear numbers, and the number of temperature difference value ranges is equal to the number of adjustment gear numbers and they are in one-to-one correspondence.

[0048] Exemplarily, the preset data table includes unequal first temperature difference value range, second temperature difference value range, and third temperature difference value range. The adjustment gear number corresponding to the first temperature difference value range is the first adjustment gear number, the adjustment gear number corresponding to the second temperature difference value range is the second adjustment gear number, and the adjustment gear number corresponding to the third temperature difference value range is the third adjustment gear number; the current temperature difference value between the saturation temperature on the outdoor unit side and the current ambient temperature is matched with the preset data table to determine the temperature difference range where the current temperature difference value is located, and the adjustment gear number corresponding to this temperature difference range is determined as the adjustment gear number corresponding to the current temperature difference value.

[0049] Step 420: Adjust the rotational speed of the fan based on the adjustment gear number.

[0050] It can be understood that the fan gear is adjusted based on the determined adjustment gear number to adjust the rotational speed of the fan so that the heat dissipation demand of the outdoor condenser matches the actual heat dissipation output of the fan.

[0051] It should be noted that considering the influence of the saturation temperature on the outdoor unit side under different ambient temperatures on system control, if the fan is used to passively control the saturation temperature on the outdoor unit side, the control process is relatively long, the time for the system to reach the equilibrium state is also long, and a large amount of energy waste will be caused. Based on this, in this embodiment, multiple adjustment levels corresponding to different temperature difference value ranges are determined in advance, and a preset data table is determined accordingly. By matching the current temperature difference value with the preset data table, the adjustment level of the fan can be determined, so as to quickly adjust the rotational speed of the fan, shorten the adjustment time for the system to reach the equilibrium state, avoid energy waste, and further improve the system energy efficiency ratio.

[0052] In an embodiment of the present invention, as Figure 4 shown, step 200, determining the saturation temperature on the outdoor unit side corresponding to the target operating parameters on the indoor unit side, may specifically include the following steps: Step 210, when the heat pump water heater is in the heating mode, determining the target high-pressure pressure saturation temperature corresponding to the target operating parameters on the indoor unit side.

[0053] Step 220, based on the target high-pressure pressure saturation temperature, determining the low-pressure pressure saturation temperature.

[0054] Step 230, determining the low-pressure pressure saturation temperature as the saturation temperature on the outdoor unit side.

[0055] It can be understood that when the heat pump water heater is in the heating mode, the target operating parameters on the indoor unit side may be the target temperature on the indoor unit side or the target high-pressure pressure on the indoor unit side. The target high-pressure pressure saturation temperature corresponding to the target operating parameters on the indoor unit side is determined according to the target temperature on the indoor unit side or the target high-pressure pressure on the indoor unit side, and the low-pressure pressure saturation temperature on the outdoor unit is determined based on the target high-pressure pressure saturation temperature on the indoor unit side. This low-pressure pressure saturation temperature on the outdoor unit is used as the saturation temperature on the outdoor unit side.

[0056] Optionally, as Figure 4 shown, step 300, determining the current temperature difference value between the saturation temperature on the outdoor unit side and the current ambient temperature, specifically includes the following content: Subtracting the current ambient temperature from the saturation temperature on the outdoor unit side to obtain the current temperature difference value.

[0057] It should be noted that the heat pump water heater usually controls according to the original air-conditioning fluorine machine system. In the heating mode, if the system is controlled according to the target high-pressure pressure saturation temperature, this control method ignores the influence of the low-pressure pressure saturation temperature on the outdoor unit side under different ambient temperatures on system control. Considering the influence of the ambient temperature, if the low-pressure pressure saturation temperature on the outdoor unit side is passively controlled by the fan, the control process is relatively long; based on this, in this embodiment, the current temperature difference value between the saturation temperature on the outdoor unit side and the current ambient temperature is calculated, and the rotational speed of the fan is actively regulated based on the current temperature difference value, so that the system can quickly reach the equilibrium state, thereby shortening the control process.

[0058] Further, as Figure 5 shown, step 400, adjusting the rotational speed of the blower based on the current temperature difference value, specifically includes the following steps: Step 430, comparing the current temperature difference value with the target temperature difference.

[0059] Step 440, when the current temperature difference value is less than the target temperature difference, increasing the rotational speed of the blower.

[0060] Step 450, when the current temperature difference value is greater than the target temperature difference, decreasing the rotational speed of the blower.

[0061] It can be understood that in the heating mode of the heat pump water heater, there is a close relationship between the saturation temperature on the outdoor unit side and the ambient temperature. When the ambient temperature is constant, the higher the rotational speed of the blower, the greater the saturation temperature on the outdoor unit side; the lower the rotational speed of the blower, the smaller the saturation temperature on the outdoor unit side. During the normal operation of the system, the saturation temperature on the outdoor unit side cannot be too large or too small. Therefore, in this embodiment, when the ambient temperature changes, the rotational speed of the blower is adjusted to make the saturation temperature on the outdoor unit side meet the requirements.

[0062] Specifically, when the heat pump water heater is in the heating mode, the target temperature on the indoor unit side is Tset, and based on the target temperature Tset on the indoor unit side, the target high-pressure pressure saturation temperature Pd_t1 on the indoor unit side is set. Pd_t1 = Tset + a, where a is a constant, generally related to the system configuration, can be determined according to experimental tests, or can also be adjusted according to other parameters such as the ambient temperature and water temperature.

[0063] Determine the low-pressure pressure saturation temperature Ps_t1 on the outdoor unit based on the target high-pressure pressure saturation temperature Pd_t1 on the indoor unit side.

[0064] Since the relationship between the low-pressure pressure saturation temperature Ps_t1 on the outdoor unit and the ambient temperature Tao is relatively close, calculate the current temperature difference value △Psh between the low-pressure pressure saturation temperature Ps_t1 on the outdoor unit and the current ambient temperature Tao. △Psh = Tao - Ps_t1.

[0065] Compare the current temperature difference value △Psh with the target temperature difference. When the current temperature difference value is less than the target temperature difference, increase the rotational speed of the blower; when the current temperature difference value is greater than the target temperature difference, decrease the rotational speed of the blower; when the current temperature difference value is equal to the target temperature difference, the blower maintains the current rotational speed. It should be noted here that the target temperature difference can be a numerical value or a range of values.

[0066] Exemplarily, the target temperature difference is within a range of values. For example, the range of the target temperature difference is α - 0.5°C to α + 0.5°C, where α is a constant set according to the system configuration, which can be determined through experimental tests. α can be adjusted according to different environments or along with other parameters such as ambient temperature and water temperature. When △Psh < α - 0.5°C, the fan shifts up a gear, and the number of gears shifted up can be reasonably designed according to the magnitude of △Psh. The greater the difference between △Psh and α - 0.5°C, the greater the number of gears shifted up until the highest gear; when α - 0.5 ≤ △Psh ≤ α + 0.5°C, the fan maintains the current gear; when △Psh > α + 0.5, the fan shifts down a gear, and the number of gears shifted down can be reasonably designed according to the magnitude of △Psh. The greater the difference between △Psh and α + 0.5, the greater the number of gears shifted down until it stops; that is, in the heating mode, when the outdoor ambient temperature rises, the fan gear is lowered, and when the outdoor ambient temperature drops, the fan gear is raised, referring to Figure 6 as shown Figure 6 In the figure, MIN represents the lowest gear of the fan, MAX represents the highest gear of the fan, and MAX - 1, MAX - 2, MAX - 3,... represent the gears between the highest and lowest gears, and the gears decrease in sequence.

[0067] In another embodiment of the present invention, as Figure 7 shown, step 200: Determine the saturation temperature on the outdoor unit side corresponding to the target operating parameters on the indoor unit side, which may specifically include the following steps: Step 240: When the heat pump water heater is in the cooling mode, determine the target low - pressure pressure saturation temperature corresponding to the target operating parameters on the indoor unit side.

[0068] Step 250: Based on the target low - pressure pressure saturation temperature, determine the high - pressure pressure saturation temperature.

[0069] Step 260: Determine the high - pressure pressure saturation temperature as the saturation temperature on the outdoor unit side.

[0070] It can be understood that in the cooling mode of the heat pump water heater, the target operating parameters on the indoor unit side can be the target temperature on the indoor unit side or the target low - pressure pressure on the indoor unit side. Determine the target low - pressure pressure saturation temperature on the indoor unit side according to the target temperature on the indoor unit side or the target low - pressure pressure on the indoor unit side, and determine the outdoor unit high - pressure pressure saturation temperature based on the target low - pressure pressure saturation temperature on the indoor unit side. This outdoor unit high - pressure pressure saturation temperature is used as the saturation temperature on the outdoor unit side.

[0071] Optionally, as Figure 7 shown, step 300: Determine the current temperature difference value between the saturation temperature on the outdoor unit side and the current ambient temperature, which specifically includes the following content: Subtract the saturation temperature on the outdoor unit side from the current ambient temperature to obtain the current temperature difference value.

[0072] It should be noted that heat pump water heaters are usually controlled according to the original air-conditioning fluorine machine system. In the cooling mode, if the system is controlled based on the target low-pressure pressure saturation temperature, this control method ignores the influence of the outdoor unit high-pressure pressure saturation temperature on the system control at different ambient temperatures. Considering the influence of the ambient temperature, if the outdoor unit high-pressure pressure saturation temperature is passively controlled by the fan, the control process is relatively long. Based on this, in this embodiment, the current temperature difference value between the saturation temperature on the outdoor unit side and the current ambient temperature is calculated, and the fan speed is actively regulated based on the current temperature difference value so that the system can quickly reach a balanced state, thereby shortening the control process.

[0073] Further, as Figure 8 shown, step 400, adjusting the speed of the fan based on the current temperature difference value specifically includes the following steps: Step 460, comparing the current temperature difference value with the target temperature difference.

[0074] Step 470, when the current temperature difference value is less than the target temperature difference, reducing the speed of the fan.

[0075] Step 480, when the current temperature difference value is greater than the target temperature difference, increasing the speed of the fan.

[0076] It can be understood that in the cooling mode of the heat pump water heater, there is a close relationship between the saturation temperature on the outdoor unit side and the ambient temperature. When the ambient temperature is constant, the higher the fan speed, the smaller the saturation temperature on the outdoor unit side; the lower the fan speed, the larger the saturation temperature on the outdoor unit side. During the normal operation of the system, the saturation temperature on the outdoor unit side cannot be too large or too small. Therefore, in this embodiment, when the ambient temperature changes, the fan speed is adjusted to make the saturation temperature on the outdoor unit side meet the requirements.

[0077] Specifically, when the heat pump water heater is in the heating mode, the target temperature on the indoor unit side is Tset, and the target low-pressure pressure saturation temperature Ps_t2 on the indoor unit side is set based on the target temperature Tset on the indoor unit side. Ps_t2 = Tset + b, where b is a constant, generally related to the system configuration, which can be determined according to experimental tests, or can also be adjusted according to other parameters such as the ambient temperature and water temperature.

[0078] Determine the outdoor unit high-pressure pressure saturation temperature Pd_t2 based on the target low-pressure pressure saturation temperature Ps_t2 on the indoor unit side.

[0079] Since the relationship between the outdoor unit high-pressure pressure saturation temperature Pd_t2 and the ambient temperature is relatively close, calculate the current temperature difference value △Pdc between the outdoor unit high-pressure pressure saturation temperature Pd_t2 and the current ambient temperature Tao, △Pdc = Pd_t2 - Tao.

[0080] Compare the current temperature difference value △Pdc with the target temperature difference. When the current temperature difference value is less than the target temperature difference, reduce the rotational speed of the fan; when the current temperature difference value is greater than the target temperature difference, increase the rotational speed of the fan; when the current temperature difference value is equal to the target temperature difference, the fan maintains its current rotational speed. It should be noted here that the target temperature difference can be a numerical value or a range of values.

[0081] Exemplarily, the target temperature difference is a range of values. For example, the range of values of the target temperature difference is β - 0.5°C to β + 0.5°C, where β is a constant, which is set according to the system configuration, can be determined based on experimental tests, and β can be adjusted according to different environments or other parameters such as ambient temperature and water temperature. When △Pdc < β - 0.5°C, the fan downshifts, and the number of downshifts can be reasonably designed according to the magnitude of △Pdc. The greater the difference between △Pdc and β - 0.5°C, the greater the number of downshifts until it stops; when β - 0.5 ≤ △Pdc ≤ β + 0.5°C, the fan maintains its current gear; when △Pdc > β + 0.5, the fan upshifts, and the number of upshifts can be reasonably designed according to the magnitude of △Pdc. The greater the difference between △Pdc and β + 0.5, the greater the number of upshifts until the highest gear; that is, in the cooling mode, when the outdoor ambient temperature rises, the fan gear is increased, and when the outdoor ambient temperature drops, the fan gear is decreased, as shown in Figure 9 shown.

[0082] An embodiment of the present invention also provides a heat pump water heater, as Figure 1 shown, and the fan of the heat pump water heater provided by any of the above embodiments is adjusted by using the fan control method of the heat pump water heater.

[0083] Specifically, when the heat pump water heater is in the heating mode, the refrigerant flows from the compressor through the four-way valve to the indoor heat exchanger, then enters the outdoor condenser through the throttling device, and then flows back to the compressor through the four-way valve, thus completing a complete heating cycle. The fan performs forced heat exchange on the outdoor condenser at different rotational speeds.

[0084] When the heat pump water heater is in the cooling mode, the refrigerant flows from the compressor through the four-way valve to the outdoor condenser, then passes through the throttling device and enters the indoor heat exchanger, and then flows back to the compressor through the four-way valve, thus completing a complete cooling cycle. The fan performs forced heat exchange on the outdoor condenser at different rotational speeds.

[0085] Optionally, the indoor heat exchanger can adopt a water-fluorine heat exchanger; preferably, a temperature measuring element 80 is provided on the outdoor condenser side, and the temperature measuring element 80 is used to measure the ambient temperature.

[0086] Next, the fan control device of the heat pump water heater provided by the present invention will be described. The fan control device of the heat pump water heater described below can be mutually referred to with the fan control method of the heat pump water heater described above.

[0087] An embodiment of the present invention provides a fan control device for a heat pump water heater, as Figure 10 shown. The control device includes an acquisition module 1010, a first determination module 1020, a second determination module 1030, and an adjustment module 1040, where: The acquisition module 1010 is configured to acquire the current ambient temperature.

[0088] The first determination module 1020 is configured to determine the saturation temperature on the outdoor unit side corresponding to the target operating parameter on the indoor unit side.

[0089] The second determination module 1030 is configured to determine the current temperature difference value between the saturation temperature on the outdoor unit side and the current ambient temperature.

[0090] The adjustment module 1040 is configured to adjust the rotation speed of the fan based on the current temperature difference value.

[0091] Figure 11 The schematic diagram of the physical structure of an electronic device is exemplified, as Figure 11 shown. The electronic device may include: a processor 1110, a communication interface 1120, a memory 1130, and a communication bus 1140. Among them, the processor 1110, the communication interface 1120, and the memory 1130 complete mutual communication through the communication bus 1140. The processor 1110 can call the logical instructions in the memory 1130 to execute the fan control method for the heat pump water heater. The method includes: acquiring the current ambient temperature, determining the saturation temperature on the outdoor unit side corresponding to the target operating parameter on the indoor unit side, determining the current temperature difference value between the saturation temperature on the outdoor unit side and the current ambient temperature, and adjusting the rotation speed of the fan based on the current temperature difference value.

[0092] In addition, when the logical instructions in the foregoing memory 1130 are implemented in the form of a software functional unit and sold or used as an independent product, they may be stored in a computer-readable storage medium. Based on such an understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or a part of the technical solution, may be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods in various embodiments of the present invention. The foregoing storage medium includes: various media such as a USB flash drive, a mobile hard disk, a read-only memory (ROM, Read-Only Memory), a random access memory (RAM, Random Access Memory), a magnetic disk, or an optical disc that can store program codes.

[0093] On the other hand, the present invention also provides a computer program product. The computer program product includes a computer program which can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer can execute the fan control method of the heat pump water heater provided by the above-mentioned various methods. The method includes: obtaining the current ambient temperature, determining the saturation temperature on the outdoor unit side corresponding to the target operating parameters on the indoor unit side, determining the current temperature difference value between the saturation temperature on the outdoor unit side and the current ambient temperature, and adjusting the rotational speed of the fan based on the current temperature difference value.

[0094] In another aspect, the present invention also provides a non-transitory computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, it realizes the fan control method of the heat pump water heater provided by the above-mentioned various methods. The method includes: obtaining the current ambient temperature, determining the saturation temperature on the outdoor unit side corresponding to the target operating parameters on the indoor unit side, determining the current temperature difference value between the saturation temperature on the outdoor unit side and the current ambient temperature, and adjusting the rotational speed of the fan based on the current temperature difference value.

[0095] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed to multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art can understand and implement it without creative effort.

[0096] Through the description of the above embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus a necessary general hardware platform, and of course, it can also be implemented by hardware. Based on such an understanding, the essence of the above technical solution, or the part that contributes to the prior art, can be embodied in the form of a software product. The computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disc, etc., and includes several instructions to enable a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods of each embodiment or some parts of the embodiments.

[0097] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A fan control method for a heat pump water heater unit, characterized in that, Including: Obtain the current ambient temperature; Determine the saturation temperature on the outdoor unit side corresponding to the target operating parameters on the indoor unit side; Determine the current temperature difference value between the saturation temperature on the outdoor unit side and the current ambient temperature; Adjust the rotational speed of the fan based on the current temperature difference value.

2. The fan control method of the heat pump water heater according to claim 1, characterized in that The adjusting the rotational speed of the fan based on the current temperature difference value includes: Match the current temperature difference value with a preset data table to determine the adjustment gear number corresponding to the current temperature difference value; different temperature difference value ranges and corresponding adjustment gear numbers are included in the preset data table; Adjust the rotational speed of the fan based on the adjustment gear number.

3. The fan control method of the heat pump water heater according to claim 1, characterized in that The determining the saturation temperature on the outdoor unit side corresponding to the target operating parameters on the indoor unit side includes: When the heat pump water heater is in the heating mode, determine the target high-pressure pressure saturation temperature corresponding to the target operating parameters on the indoor unit side; Based on the target high-pressure pressure saturation temperature, determine the low-pressure pressure saturation temperature; Determine the low-pressure pressure saturation temperature as the saturation temperature on the outdoor unit side; The determining the current temperature difference value between the saturation temperature on the outdoor unit side and the current ambient temperature includes: Subtract the current ambient temperature from the saturation temperature on the outdoor unit side to obtain the current temperature difference value.

4. The fan control method of the heat pump water heater according to claim 3, characterized in that, The adjusting the rotational speed of the fan based on the current temperature difference value includes: Compare the current temperature difference value with the target temperature difference; When the current temperature difference value is less than the target temperature difference, increase the rotational speed of the fan; When the current temperature difference value is greater than the target temperature difference, decrease the rotational speed of the fan.

5. The fan control method of the heat pump water heater according to any one of claims 1 to 4, characterized in that, The determining the saturation temperature on the outdoor unit side corresponding to the target operating parameters on the indoor unit side includes: When the heat pump water heater is in the cooling mode, determine the target low-pressure pressure saturation temperature corresponding to the target operating parameters on the indoor unit side; Based on the target low-pressure pressure saturation temperature, determine the high-pressure pressure saturation temperature; Determine the high-pressure pressure saturation temperature as the saturation temperature on the outdoor unit side; The determining the current temperature difference value between the saturation temperature on the outdoor unit side and the current ambient temperature includes: Subtract the current ambient temperature from the saturation temperature on the outdoor unit side to obtain the current temperature difference value.

6. The fan control method of the heat pump water heater according to claim 5, characterized in that, The adjusting the rotational speed of the fan based on the current temperature difference value includes: Compare the current temperature difference value with the target temperature difference; When the current temperature difference value is less than the target temperature difference, decrease the rotational speed of the fan; When the current temperature difference value is greater than the target temperature difference, increase the rotational speed of the fan.

7. A fan control device for a heat pump water heater, characterized in that, Including: An acquisition module for obtaining the current ambient temperature; A first determination module for determining the saturation temperature on the outdoor unit side corresponding to the target operating parameters on the indoor unit side; A second determination module for determining the current temperature difference value between the saturation temperature on the outdoor unit side and the current ambient temperature; An adjustment module for adjusting the rotational speed of the fan based on the current temperature difference value.

8. A heat pump water heater unit, characterized in that, Including a compressor, an indoor heat exchanger, an outdoor condenser, and a fan, and adjusting the fan by using the fan control method of the heat pump water heater according to any one of claims 1 to 6.

9. The heat pump water heater according to claim 8, wherein A temperature measuring element is provided on the outdoor condenser side.

10. An electronic device, comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the fan control method of the heat pump water heater according to any one of claims 1 to 6.

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