Control method and device for outdoor unit of heat pump system, heat pump system and computer readable storage medium

Abstract

The invention relates to the technical field of air conditioners, and discloses a control method for an outdoor unit of a heat pump system, the tail end of the heat pump system comprises an indoor unit heat exchanger and a hot water tank, and the control method comprises the steps that under the condition that heat supply requirements and hot water requirements exist indoors, the highest water outlet temperature of the heat pump system is determined according to the heat supply requirements and the hot water requirements; determining a compressor target operation frequency range corresponding to the highest outlet water temperature according to a mapping relation between the outlet water temperature and the compressor operation frequency; and controlling the compressor to execute the target operation frequency range. The running frequency of the compressor determined by the method can meet the heat supply requirement and the hot water requirement, the running range of the compressor is matched with the requirements, and high energy consumption is avoided. The invention further discloses a control device for the outdoor unit of the heat pump system, the heat pump system and a computer readable storage medium.

Description

Technical Field

[0001] This application relates to the technical field of air conditioners, for example, to a control method and device for an outdoor unit of a heat pump system, a heat pump system, and a computer-readable storage medium. Background Art

[0002] With the advantages of heat pump technology in energy conservation and consumption reduction, its applications in heating and hot water are becoming more and more widespread. The heat pump system can not only provide indoor heating, but also supply hot water indoors, realizing multi-scenario applications. However, in multi-scenario applications, the control of the outdoor unit is mainly based on the parameters of the compressor and is not combined with indoor demands, resulting in high control energy consumption of the outdoor unit and inability to meet user needs.

[0003] The related art discloses a control method for a heat pump unit. The method includes: when the to-be-operated mode of the heat pump unit is set to the heating plus domestic hot water mode, determining the target operation mode of the heat pump unit according to a first demand judgment strategy, where the target operation mode includes any one of a heating mode, a heating plus domestic hot water mode, and a domestic hot water mode. Then, the heat pump unit calculates the target output frequency in the target operation mode based on a pre-stored capacity calculation mapping table, and controls the compressor to operate at the target output frequency.

[0004] In the process of implementing the embodiments of the present disclosure, it is found that at least the following problems exist in the related art:

[0005] In the related art, based on parameters such as the outlet water temperature on the air conditioner side and the heating target temperature, the target operation frequency of the compressor is determined; this method can ensure indoor heating demand but cannot take into account the satisfaction of hot water demand.

[0006] It should be noted that the information disclosed in the above background art section is only used to strengthen the understanding of the background of this application, and therefore may include information that does not constitute the prior art known to those of ordinary skill in the art. Summary of the Invention

[0007] To have a basic understanding of some aspects of the disclosed embodiments, a simple summary is given below. This summary is not a general review, nor is it intended to identify key / important elements or delineate the protection scope of these embodiments, but rather serves as a preface to the subsequent detailed description.

[0008] The embodiments of the present disclosure provide a control method and device for an outdoor unit of a heat pump system, a heat pump system, and a computer-readable storage medium to meet the multi-scenario demands of heating and hot water.

[0009] In some embodiments, the terminal of the heat pump system includes an indoor unit heat exchanger and a hot water tank. The method includes: when there is a heating demand and a hot water demand indoors, determining the maximum outlet water temperature of the heat pump system according to the heating demand and the hot water demand; determining the range of the target operating frequency of the compressor corresponding to the maximum outlet water temperature according to the mapping relationship between the outlet water temperature and the compressor operating frequency; and controlling the compressor to operate within the target operating frequency range.

[0010] Optionally, determining the maximum outlet water temperature of the heat pump system according to the heating demand and the hot water demand includes: determining a first outlet water temperature corresponding to the heating demand and a second outlet water temperature corresponding to the hot water demand; and taking the maximum value of the first outlet water temperature and the second outlet water temperature as the maximum outlet water temperature of the heat pump system. When the actual outlet water temperature of the outdoor unit reaches the maximum outlet water temperature, the unit can meet both the heating demand and the hot water demand. In this way, the outlet water temperature of the outdoor unit can take into account multiple demands and ensure the stability of the indoor temperature and the hot water temperature.

[0011] Optionally, controlling the compressor to operate within the target operating frequency range includes: controlling the compressor to operate at the minimum frequency within the target operating frequency range; and adjusting the operating frequency of the compressor according to the real-time outlet water temperature. In this way, within the target operating frequency range, the best compressor operating frequency is matched. It can quickly meet the terminal demand and the system operates reliably.

[0012] Optionally, adjusting the operating frequency of the compressor according to the real-time outlet water temperature includes: when the real-time outlet water temperature is less than the maximum outlet water temperature, obtaining the change rate of the real-time outlet water temperature; and adjusting the operating frequency of the compressor according to the change rate of the real-time outlet water temperature. When the change rate of the real-time outlet water temperature is large, it indicates that the outlet water temperature rises rapidly. At this time, the operating frequency of the compressor can be slightly increased. When the change rate of the real-time outlet water temperature is small, it indicates that the outlet water temperature rises slowly. At this time, the operating frequency of the compressor can be greatly increased. In this way, rapid heating can be achieved and the compressor can be ensured to operate within a reasonable operating frequency range.

[0013] Optionally, adjusting the operating frequency of the compressor according to the change rate of the real-time outlet water temperature includes: when the change rate of the real-time outlet water temperature is less than the first rate, controlling the compressor to increase the frequency at the first amplitude; when the change rate of the real-time outlet water temperature is greater than or equal to the first rate, controlling the compressor to maintain the current operating frequency, or controlling the compressor to increase the frequency at the second amplitude; where the first amplitude is greater than the second amplitude. In this way, the real-time outlet water temperature can be quickly increased to reach the maximum outlet water temperature. It can also prevent the operating frequency of the compressor from being too high, which helps to save energy.

[0014] Optionally, after controlling the compressor to operate within the target operating frequency range, the method further includes: determining a correction coefficient according to the exhaust temperature and the superheat degree of the exhaust of the compressor; determining the target opening degree of the electronic expansion valve according to the determined correction coefficient, the current opening degree, and the change rate of the superheat degree of the exhaust; and controlling the electronic expansion valve to execute the target opening degree. In this way, according to the operating parameters of the compressor, the opening degree of the electronic expansion valve is adjusted to adjust the compression ratio of the compressor so that the compression ratio is within a suitable range, ensuring the efficient operation of the compressor.

[0015] Optionally, determining a correction coefficient according to the exhaust temperature and the superheat degree of the exhaust of the compressor includes: when the exhaust temperature is greater than the temperature threshold and the superheat degree of the exhaust is greater than the superheat degree threshold, determining that the correction coefficient is a value greater than the preset coefficient. In this way, the opening degree of the electronic expansion valve is closely related to the operating parameters of the compressor, so that the opening degree of the electronic expansion valve matches the operating frequency of the compressor, thereby ensuring the stability of the operation of the heat pump system.

[0016] In some embodiments, the device includes: a processor and a memory storing program instructions, and the processor is configured to execute the control method for the outdoor unit of the heat pump system as described above when running the program instructions.

[0017] In some embodiments, the heat pump system includes: an outdoor unit; and a control device for the outdoor unit of the heat pump system as described above, installed on the outdoor unit.

[0018] In some embodiments, the computer-readable storage medium stores program instructions, and when the program instructions are running, they are used to cause a computer to execute the control method for the outdoor unit of the heat pump system as described above.

[0019] The control method and device for the outdoor unit of the heat pump system, the heat pump system, and the computer-readable storage medium provided by the embodiments of the present disclosure can achieve the following technical effects:

[0020] In the embodiments of the present disclosure, when there is a heating demand and a hot water demand in the heat pump system, the highest outlet water temperature that can meet multiple demands is determined. Then, based on the corresponding relationship between the outlet water temperature and the operating frequency of the compressor, the target operating frequency range corresponding to the highest outlet water temperature is determined to control the compressor to operate within the target operating frequency range. In this way, the operating frequency of the compressor can take into account the heating demand and the hot water demand, and the operating range of the compressor matches the demand, avoiding high energy consumption.

[0021] The above general description and the following description are only exemplary and explanatory, and are not used to limit the present application. Description of the Drawings

[0022] One or more embodiments are exemplarily illustrated by corresponding drawings. These exemplary illustrations and the drawings do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are shown as similar elements. The drawings do not constitute a scale limitation, and wherein:

[0023] Figure 1 is a schematic diagram of a heat pump system provided by an embodiment of the present disclosure;

[0024] Figure 2 is a schematic diagram of a control method for an outdoor unit of a heat pump system provided by an embodiment of the present disclosure;

[0025] Figure 3 is a schematic diagram of another control method for an outdoor unit of a heat pump system provided by an embodiment of the present disclosure;

[0026] Figure 4 is a schematic diagram of another control method for an outdoor unit of a heat pump system provided by an embodiment of the present disclosure;

[0027] Figure 5 is a schematic diagram of a control device for an outdoor unit of a heat pump system provided by an embodiment of the present disclosure;

[0028] Figure 6 is a schematic diagram of another heat pump system provided by an embodiment of the present disclosure.

[0029] Reference numerals:

[0030] 10: Outdoor unit; 20: Hot water tank; 30: Indoor heat exchanger; 40: Buffer tank;

[0031] 100: Control device for an outdoor unit of a heat pump system; 101: Processor; 102: Memory; 103: Communication interface; 104: Bus. Detailed implementation manners

[0032] In order to be able to understand the features and technical content of the embodiments of the present disclosure in more detail, the implementation of the embodiments of the present disclosure will be described in detail below with reference to the drawings. The attached drawings are for reference and illustration only, and are not used to limit the embodiments of the present disclosure. In the following technical description, for the sake of explanation, numerous details are provided to give a thorough understanding of the disclosed embodiments. However, one or more embodiments may still be implemented without these details. In other cases, well-known structures and devices may be shown in a simplified manner to simplify the drawings.

[0033] In the description, claims, and the above-mentioned drawings of the embodiments of the present disclosure, terms such as "first" and "second" are used to distinguish similar objects and do not necessarily describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances so as to implement the embodiments of the present disclosure described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusion.

[0034] Unless otherwise specified, the term "plurality" means two or more.

[0035] In the embodiments of the present disclosure, the character " / " indicates that the objects before and after are in an "or" relationship. For example, A / B means: A or B.

[0036] The term "and / or" is an associative relationship describing an object, indicating that there can be three relationships. For example, A and / or B means: A or B, or, the three relationships of A and B.

[0037] The term "corresponding" may refer to an associative relationship or a binding relationship. A corresponding to B means that there is an associative relationship or a binding relationship between A and B.

[0038] Combined Figure 1 , the heat pump system includes an outdoor unit 10 and terminal equipment located indoors. Among them, the terminal equipment includes a hot water tank 20 and an indoor heat exchanger 30. The outdoor unit 10 includes a refrigerant circulation circuit, and the refrigerant circulation circuit includes a compressor, an electronic expansion valve, a throttling device, an evaporator, and a condenser. The terminal equipment exchanges heat through a water circulation circuit and the refrigerant circulation circuit of the outdoor unit to provide heat for the indoor during heating (the outdoor unit generates hot water for the indoor); and provides cold for the indoor during cooling (the outdoor unit generates cold water for the indoor). During heating, the hot water generated by the outdoor unit flows into the hot water tank and / or the indoor heat exchanger through the water circulation circuit to heat the indoor and / or provide hot water. There can be multiple indoor heat exchangers 30. When there are multiple indoor heat exchangers 30, the outdoor unit 10 is connected to each indoor heat exchanger through a buffer tank 40.

[0039] Among them, the indoor demand during heating includes only heating demand, only hot water demand, and the coexistence of heating demand and hot water demand. The heating demands required in each room during heating may vary, and the heating demand and hot water demand may also vary for the outlet water temperature of the outdoor unit. Given the outlet water temperature, adjust the hot water flow rate in each room based on the demand, as well as the hot water flow rate for the heating demand; thus meeting the demands at each temperature.

[0040] Combined Figure 2 As shown, the embodiments of the present disclosure provide a control method for the outdoor unit of a heat pump system, including:

[0041] S101. When there is a heating demand and a hot water demand indoors, the processor determines the maximum outlet water temperature of the heat pump system according to the heating demand and the hot water demand.

[0042] S102. The processor determines the target operating frequency range of the compressor corresponding to the maximum outlet water temperature according to the mapping relationship between the outlet water temperature and the compressor operating frequency.

[0043] S103. The processor controls the compressor to operate within the target operating frequency range.

[0044] Here, the heating demand refers to heating the indoor air, that is, the indoor heat exchanger provides heat for the indoor space environment. The heating demand includes heating for one indoor space environment or multiple indoor space environments. The hot water demand refers to the demand for using hot water indoors, that is, the hot water tank is heated to provide hot water for users. It can be understood that under the same conditions, different set temperatures indoors result in different heating requirements. Similarly, there may be differences between the outlet water temperature of the outdoor unit corresponding to the set temperature indoors and the outlet water temperature of the outdoor unit corresponding to the set temperature of the hot water demand.

[0045] To meet the heating demand and the hot water demand, the maximum outlet water temperature of the heat pump system is determined based on the two demands. The maximum outlet water temperature refers to the outlet water temperature that meets the heating demand and the hot water demand. As an example, based on the hot water demand and the magnitude of the hot water demand, the outlet water temperature corresponding to the maximum heat demand is used as the maximum outlet water temperature. In this way, the maximum outlet water temperature can meet both the heating demand and the hot water demand. Then, based on the mapping relationship between the outlet water temperature and the compressor operating frequency, the target operating frequency range of the compressor corresponding to the maximum outlet water temperature is determined. In this way, based on the outlet water temperature, the corresponding compressor operating frequency range is selected, and the compressor is controlled to operate within the target operating frequency range. Among them, controlling the compressor to operate within the target operating frequency range can be to control the compressor to operate at the lower limit frequency, the upper limit frequency, or the intermediate value, etc. in the range value. Then, the operating frequency of the compressor is corrected based on the operating parameters to make the compressor operate at the optimal frequency. Limiting the operating frequency range of the compressor enables the compressor to quickly lock in the working frequency range. In this way, the operating frequency of the compressor matches the demand, and the user's demand can be met. At the same time, it helps with the energy saving of the unit and the stability of operation.

[0046] Using the control method for the outdoor unit of the heat pump system provided by the embodiments of the present disclosure, when there is a heating demand and a hot water demand in the heat pump system, the maximum outlet water temperature that can meet multiple demands is determined. Then, based on the correspondence between the outlet water temperature and the compressor operating frequency, the target operating frequency range corresponding to the maximum outlet water temperature is determined to control the compressor to operate within the target operating frequency range. In this way, the operating frequency of the compressor can take into account the heating demand and the hot water demand, and the operating range of the compressor matches the demand, avoiding high energy consumption.

[0047] Optionally, in step S102, the processor determines the maximum outlet water temperature of the heat pump system according to the heating demand and the hot water demand, including:

[0048] The processor determines a first outlet water temperature corresponding to the heating demand and a second outlet water temperature corresponding to the hot water demand.

[0049] The processor takes the maximum value of the first outlet water temperature and the second outlet water temperature as the maximum outlet water temperature of the heat pump system.

[0050] Here, when the user has a heating demand, the user sets a set temperature. Based on the set temperature, the corresponding target outlet water temperature can be determined, that is, there is a first relationship between the set temperature and the target outlet water temperature. Therefore, based on the heating demand, the corresponding first outlet water temperature can be determined. The first outlet water temperature is the outlet water temperature of the outdoor unit when the heating demand can be met. Similarly, when the user has a hot water demand, the user also sets a target water temperature. Without considering the heat loss of hot water transportation, the target water temperature is the outlet water temperature of the outdoor unit when there is a hot water demand, that is, the second outlet water temperature.

[0051] After determining the corresponding first outlet water temperature and second outlet water temperature based on the heating demand and the hot water demand, compare their magnitudes. Take the larger value of the two as the maximum outlet water temperature of the outdoor unit, that is, the target outlet water temperature of the outdoor unit. When the actual outlet water temperature of the outdoor unit reaches the maximum outlet water temperature, the heat pump system can meet both the heating demand and the hot water demand. In this way, the outlet water temperature of the outdoor unit can take into account multiple demands and ensure the stability of the indoor temperature and the hot water temperature.

[0052] Optionally, in the case where there is a heating demand in multiple indoor spaces, the processor determines the corresponding first outlet water temperature according to the heating demand with the highest set temperature.

[0053] Here, there is a heating demand in multiple indoor spaces. Since the initial conditions of each indoor space are basically the same. Therefore, the heating demand of each indoor mainly depends on the set temperature of each indoor. Select the maximum value from the set temperatures of each indoor, and take the outlet water temperature corresponding to the maximum set temperature as the first outlet water temperature. It can be understood that if the outlet water temperature of the outdoor unit can meet the highest set temperature, it will surely be able to meet the demands of other set temperatures. By adjusting the hot water flow rate of each indoor heat exchanger, each set temperature is achieved. In this way, when heating multiple indoor spaces, it is avoided that the indoor temperature of some rooms is difficult to reach the set temperature.

[0054] Optionally, the mapping relationship between the outlet water temperature and the compressor operating frequency is shown in Table 1.

[0055] Table 1

[0056] Outlet water temperature (°C) Upper limit frequency (Hz) Lower limit frequency (Hz) High temperature zone H1 L1 Medium temperature zone H2 L2 Low temperature zone H3 L3

[0057] Here, the outlet water temperature is divided into three temperature ranges: high, medium, and low. Each outlet water temperature range corresponds to an operating frequency range of the compressor, and each operating frequency range has an upper limit frequency and a lower limit frequency. Among them, when the outlet water temperature is greater than the first temperature, the corresponding temperature range is the high-temperature zone. When the outlet water temperature is less than or equal to the first temperature and greater than the second temperature, the corresponding temperature range is the medium-temperature zone. When the outlet water temperature is less than or equal to the second temperature, the corresponding temperature range is the low-temperature zone. Among them, as the temperature value of the temperature range decreases, the value of the corresponding compressor operating frequency range also decreases as a whole, that is, the lower limit frequency of the operating frequency range corresponding to the high-temperature zone is greater than the upper limit frequency of the operating frequency range corresponding to the medium-temperature zone. In this way, the operating frequency range of the compressor is quickly matched through the outlet water temperature, making the operating frequency of the compressor more suitable and helping to reduce energy consumption.

[0058] In addition, it should be noted that the lower limit frequency L3 of the minimum operating frequency range is greater than the minimum frequency at which the compressor can operate during the normal operation of the heat pump system. This ensures that there will be no problem of poor oil return during the long-term low-frequency operation of the compressor and guarantees the reliability of the operation.

[0059] Combined with Figure 3 As shown, the embodiment of the present disclosure provides another control method for the outdoor unit of a heat pump system, including:

[0060] S101, in the case where there is a heating demand and a hot water demand indoors, the processor determines the highest outlet water temperature of the heat pump system according to the heating demand and the hot water demand.

[0061] S102, the processor determines the target operating frequency range of the compressor corresponding to the highest outlet water temperature according to the mapping relationship between the outlet water temperature and the compressor operating frequency.

[0062] S131, the processor controls the compressor to operate at the minimum frequency in the target operating frequency range.

[0063] S132, the processor adjusts the operating frequency of the compressor according to the real-time outlet water temperature.

[0064] Here, after determining the target operating frequency range of the compressor, first control the compressor to operate at the minimum operating frequency within the target operating range. If the minimum operating frequency can meet the demand, avoid the compressor operating at a higher frequency, causing energy waste. If the minimum operating frequency cannot meet the demand, then increase the operating frequency of the compressor to increase the frequency within the target operating frequency range to meet the demand. Specifically, based on the real-time outlet water temperature, determine whether the demand is met, which is used as the basis for adjusting the operating frequency of the compressor. If the real-time outlet water temperature is much lower than the maximum outlet water temperature, then increase the operating frequency of the compressor. If the real-time outlet water temperature approaches or is equal to the maximum outlet water temperature, then maintain the current operating frequency of the compressor. In this way, within the target operating frequency range, the best compressor operating frequency is matched. It can quickly meet the end demand, and the system operates reliably.

[0065] Optionally, in S132, the processor adjusts the operating frequency of the compressor according to the real-time outlet water temperature, including:

[0066] When the real-time outlet water temperature is lower than the maximum outlet water temperature, the processor obtains the change rate of the real-time outlet water temperature.

[0067] The processor adjusts the operating frequency of the compressor according to the change rate of the real-time outlet water temperature.

[0068] Here, after the compressor operates at the minimum frequency within the target operating frequency range, the real-time outlet water temperature is detected. If the real-time outlet water temperature is lower than the maximum outlet water temperature, it indicates that the current operating frequency of the compressor cannot quickly meet the end demand. In order to quickly meet the end demand (the hot water demand has high requirements for timeliness), based on the change rate of the real-time outlet water temperature, the operating frequency of the compressor is adjusted. The change rate of the real-time outlet water temperature can relatively quickly reflect the temperature change trend. When the change rate of the real-time outlet water temperature is large, it indicates that the outlet water temperature rises rapidly. At this time, the operating frequency of the compressor can be slightly increased. When the change rate of the real-time outlet water temperature is small, it indicates that the outlet water temperature rises slowly. At this time, the operating frequency of the compressor can be greatly increased. In this way, rapid heating can be achieved, and it is ensured that the compressor operates within a reasonable operating frequency range.

[0069] Optionally, the processor adjusts the operating frequency of the compressor according to the change rate of the real-time outlet water temperature, including:

[0070] When the change rate of the real-time outlet water temperature is less than the first rate, the processor controls the compressor to increase the frequency according to the first amplitude.

[0071] When the change rate of the real-time outlet water temperature is greater than or equal to the first rate, the processor controls the compressor to maintain the current operating frequency, or controls the compressor to increase the frequency according to the second amplitude.

[0072] Among them, the first amplitude is greater than the second amplitude.

[0073] Here, a first rate is set to characterize the magnitude of the change rate of the real-time outlet water temperature. When the change rate of the real-time outlet water temperature is less than the first rate, the compressor is controlled to increase its frequency at the first amplitude, that is, the compressor is controlled to quickly increase its frequency. When the change rate of the real-time outlet water temperature is greater than or equal to the first rate, the compressor is controlled to maintain the current operating frequency, or the compressor is controlled to increase its frequency at the second amplitude, that is, the compressor is controlled to slowly increase its frequency. In this way, the real-time outlet water temperature can be quickly increased to reach the maximum outlet water temperature. It can also prevent the operating frequency of the compressor from being too high, which helps to save energy.

[0074] Optionally, when the change rate of the real-time outlet water temperature is greater than or equal to the first rate, the processor determines the adjustment strategy of the compressor based on the first outlet water temperature and the second outlet water temperature.

[0075] Here, when the change rate of the real-time outlet water temperature is greater than or equal to the first rate, based on the first outlet water temperature and the second outlet water temperature, the compressor is selected to maintain the current operating frequency or the compressor is controlled to increase its frequency according to the second amplitude. Specifically, if the first outlet water temperature is greater than the second outlet water temperature, it indicates that the heating demand is greater than the hot water demand. At this time, although the real-time outlet water temperature rises relatively slowly, it can meet the hot water demand, so the current operating frequency of the compressor can be maintained. If the first outlet water temperature is less than or equal to the second outlet water temperature, it indicates that the heating demand is less than the hot water demand. In order to meet the timeliness of the hot water demand, at this time, the compressor is controlled to increase its frequency at the second amplitude to increase the rising amplitude of the real-time outlet water temperature and make the outlet water temperature reach the maximum outlet water temperature as soon as possible. Thus, the hot water demand can be met, and the user's water use can be satisfied more quickly while saving energy.

[0076] Combined Figure 4 As shown, another control method for the outdoor unit of a heat pump system provided by an embodiment of the present disclosure includes:

[0077] S101. When there are heating demands and hot water demands indoors, the processor determines the maximum outlet water temperature of the heat pump system according to the heating demands and the hot water demands.

[0078] S102. The processor determines the compressor target operating frequency range corresponding to the maximum outlet water temperature according to the mapping relationship between the outlet water temperature and the compressor operating frequency.

[0079] S103. The processor controls the compressor to operate within the target operating frequency range.

[0080] S204. The processor determines the correction coefficient according to the exhaust temperature and the exhaust superheat of the compressor.

[0081] S205, the processor determines the target opening degree of the electronic expansion valve according to the determined correction coefficient, the current opening degree, and the change rate of the exhaust superheat degree.

[0082] S206, the processor controls the electronic expansion valve to execute the target opening degree.

[0083] Here, after controlling the compressor to execute the target operating frequency range, according to the operating parameters of the compressor, the opening degree of the electronic expansion valve is adjusted. To adjust the compression ratio of the compressor so that the compression ratio is within a suitable range to ensure the efficient operation of the compressor. Specifically, the exhaust temperature and the exhaust superheat degree of the compressor are obtained, and based on the exhaust temperature and the exhaust superheat degree, the correction coefficient of the electronic expansion valve is determined. When the exhaust temperature is relatively high and the exhaust superheat degree is relatively large, at this time, it is necessary to increase the opening degree of the electronic expansion valve and increase the refrigerant flow rate to reduce the superheat degree. Therefore, the correction coefficient is relatively large. On the contrary, when the exhaust temperature is relatively low and the exhaust superheat degree is relatively small, the correction coefficient is relatively small, that is, the opening degree of the electronic expansion valve is adjusted smaller.

[0084] Based on the correction coefficient, the current opening degree, and the change rate of the exhaust superheat degree, the target opening degree of the electronic expansion valve is determined. Among them, the correction coefficient, the change rate of the exhaust superheat degree, and the size of the target opening degree are positively correlated. The larger the correction coefficient, the larger the change rate of the exhaust superheat degree, and the larger the target opening degree. Make the target opening degree greater than the current opening degree to achieve an increase in the opening degree. The smaller the correction coefficient, the smaller the change rate of the exhaust superheat degree, and the smaller the target opening degree. Make the target opening degree less than the current opening degree to achieve a decrease in the opening degree. In this way, the compression ratio of the compressor conforms to the current working condition, and the compressor is in an efficient operating state.

[0085] Optionally, in step S204, the processor determines the correction coefficient according to the exhaust temperature and the exhaust superheat degree of the compressor, including:

[0086] In the case where the exhaust temperature is greater than the first temperature threshold and the exhaust superheat degree is greater than the first superheat degree threshold, the processor determines that the correction coefficient is a value greater than the preset coefficient.

[0087] Here, the preset coefficient takes a value of 1, and the first temperature threshold and the first superheat degree threshold are set. When the exhaust temperature is greater than the first temperature threshold, it indicates that the exhaust temperature is high. When the exhaust superheat degree is greater than the first superheat degree threshold, it indicates that the exhaust superheat degree is high. When the above two conditions are met simultaneously, it is determined that the electronic expansion valve needs to be adjusted to a larger opening degree, so the correction coefficient is determined to be a value greater than the preset coefficient. In this way, after correcting the electronic expansion valve based on the current opening degree, the corrected opening degree is greater than the current opening degree.

[0088] In addition, the correction coefficient is positively correlated with the exhaust gas temperature and the exhaust gas superheat degree. Determining the correction coefficient also includes determining that the correction coefficient is a coefficient less than the preset coefficient when the exhaust gas temperature is less than the second temperature threshold and the exhaust gas superheat degree is less than the second superheat degree threshold. In this way, when the exhaust gas temperature is low and the exhaust gas superheat degree is small, the opening degree of the electronic expansion valve is adjusted downwards. In this way, the opening degree of the electronic expansion valve is closely related to the operating parameters of the compressor, so that the opening degree of the electronic expansion valve matches the operating frequency of the compressor, thereby ensuring the stability of the operation of the heat pump system.

[0089] As an example, the relationship between the correction coefficient and the exhaust gas temperature T dis , the exhaust gas superheat degree ΔT i is shown in Table 2 in detail.

[0090] Table 2

[0091] Tdis 15 ≤ ΔTi < 20 10 ≤ ΔTi < 15 5 ≤ ΔTi < 10 0 ≤ ΔTi < 5 ΔTi < 0 110 1.2 1.12 1.08 1 0.98 105 1.15 1.08 1.02 0.98 0.95 … … … … … …

[0092] Optionally, in step S205, the processor determines the target opening degree of the electronic expansion valve according to the determined correction coefficient, the current opening degree, and the exhaust gas temperature change rate, including:

[0093] Calculate E’ = E × F × (ΔT i / ΔT i-1 )

[0094] wherein, E’ is the target opening degree of the electronic expansion valve, E is the current opening degree of the electronic expansion valve, F is the correction coefficient, ΔT i is the exhaust gas superheat degree at the i-th moment, and ΔT i-1 is the exhaust gas superheat degree at the (i - 1)-th moment. In this way, the matching degree between the opening degree of the electronic expansion valve and the operating parameters of the compressor is realized.

[0095] Optionally, the hot water tank is provided with a heater. After the processor controls the compressor to operate within the target operating frequency range in step S103, the method further includes: the processor controls the heater to work.

[0096] Here, when there are both heating demands and hot water demands, the heater of the hot water tank is controlled to work to ensure the real-time nature of the hot water demands. The user experience is improved, and at the same time, large water temperature fluctuations are avoided.

[0097] Combined with Figure 5As shown in the figure, an embodiment of the present disclosure provides a control device 100 for an outdoor unit of a heat pump system, including a processor 101 and a memory 102. Optionally, the device may further include a communication interface 103 and a bus 104. Among them, the processor 101, the communication interface 103, and the memory 102 can complete mutual communication through the bus 102. The communication interface 103 can be used for information transmission. The processor 101 can call the logical instructions in the memory 102 to execute the control method for the outdoor unit of the heat pump system in the above embodiment.

[0098] In addition, when the logical instructions in the above-mentioned memory 102 are implemented in the form of software functional units and sold or used as an independent product, they can be stored in a computer-readable storage medium.

[0099] The memory 102, as a computer-readable storage medium, can be used to store software programs and computer-executable programs, such as the program instructions / modules corresponding to the method in the embodiment of the present disclosure. The processor 101 executes functional applications and data processing by running the program instructions / modules stored in the memory 102, that is, implements the control method for the outdoor unit of the heat pump system in the above embodiment.

[0100] The memory 102 may include a program storage area and a data storage area. Among them, the program storage area can store an operating system and application programs required for at least one function; the data storage area can store data created according to the use of the terminal device, etc. In addition, the memory 102 may include a high-speed random access memory and may also include a non-volatile memory.

[0101] Combined with Figure 6 As shown in the figure, an embodiment of the present disclosure provides a heat pump system, including: an outdoor unit 10 and the above-mentioned control device 100 for the outdoor unit of the heat pump system. The control device 100 for the outdoor unit of the heat pump system is installed on the outdoor unit. The installation relationship described here is not limited to being placed inside the outdoor unit, but also includes installation connections with other components of the heat pump system, including but not limited to physical connections, electrical connections, or signal transmission connections, etc. Those skilled in the art can understand that the control device 100 for the outdoor unit of the heat pump system can be adapted to a feasible main body, and thus other feasible embodiments can be realized.

[0102] An embodiment of the present disclosure provides a computer-readable storage medium storing computer-executable instructions, and the computer-executable instructions are set to execute the above-mentioned control method for the outdoor unit of the heat pump system.

[0103] The technical solution of the embodiments of the present disclosure can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes one or more 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 method described in the embodiments of the present disclosure. The foregoing storage medium may be a non-transitory storage medium, such as: a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disc, etc., which are various media that can store program codes.

[0104] The above description and drawings fully illustrate the embodiments of the present disclosure so that those skilled in the art can practice them. Other embodiments may include structural, logical, electrical, process, and other changes. The embodiments merely represent possible variations. Unless explicitly required, the individual components and functions are optional, and the order of operations may vary. Parts and features of some embodiments may be included in or substituted for parts and features of other embodiments. Moreover, the terms used in this application are only for describing the embodiments and are not used to limit the claims. As used in the description of the embodiments and the claims, unless the context clearly indicates otherwise, the singular forms "a", "an", and "the" are intended to also include the plural forms. Similarly, as used in this application, the term "and / or" refers to any and all possible combinations including one or more of the associated listed items. Additionally, when used in this application, the term "comprise" and its variants "comprises" and / or "comprising" etc. mean the presence of the stated features, wholes, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components, and / or groups of these. Without further limitation, an element defined by the statement "comprising one..." does not exclude the presence of additional identical elements in the process, method, or device comprising the element. In this document, each embodiment may focus on the differences from other embodiments, and the same or similar parts among the various embodiments may be referred to each other. For the methods, products, etc. disclosed in the embodiments, if they correspond to the method part disclosed in the embodiments, the relevant parts may refer to the description of the method part.

[0105] Those skilled in the art will realize that the units and algorithm steps of each example described in combination with the embodiments disclosed herein can be implemented by electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are executed in hardware or software can depend on the specific application and design constraints of the technical solution. The skilled person can use different methods for each specific application to implement the described functions, but such implementation should not be considered to exceed the scope of the embodiments of the present disclosure. The skilled person can clearly understand that for the convenience and conciseness of description, the specific working processes of the systems, devices, and units described above can refer to the corresponding processes in the foregoing method embodiments and will not be elaborated herein.

[0106] In the embodiments disclosed herein, the disclosed methods, products (including but not limited to devices, equipment, etc.) can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the units can be merely a logical function division, and there can be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Additionally, the couplings or direct couplings or communication connections shown or discussed among each other can be through some interfaces, and the indirect couplings or communication connections of the devices or units can be in electrical, mechanical, or other forms. The units described as separate components can be or can not be physically separated, and the components shown as units can be or can not be physical units, that is, they can be located in one place or can be distributed to multiple network units. Some or all of the units can be selected according to actual needs to implement this embodiment. Additionally, in the embodiments of the present disclosure, the functional units can be integrated in one processing unit, or each unit can exist physically alone, or two or more units can be integrated in one unit.

[0107] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to embodiments of the present disclosure. In this regard, each block in the flowchart or block diagram may represent a module, a segment of a program, or a portion of code that contains one or more executable instructions for implementing a specified logical function. In some alternative implementations, the functions noted in the blocks may occur in a different order than noted in the accompanying drawings. For example, two consecutive blocks may in fact be executed substantially in parallel, or they may sometimes be executed in the reverse order, depending on the functions involved. In the descriptions corresponding to the flowcharts and block diagrams in the accompanying drawings, the operations or steps corresponding to different blocks may also occur in a different order than disclosed in the description, and sometimes there is no specific order between different operations or steps. For example, two consecutive operations or steps may in fact be executed substantially in parallel, or they may sometimes be executed in the reverse order, depending on the functions involved. Each block in the block diagram and / or flowchart, and combinations of blocks in the block diagram and / or flowchart, can be implemented by a dedicated hardware-based system that performs the specified functions or actions, or can be implemented by a combination of dedicated hardware and computer instructions.

Claims

1. A control method for an outdoor unit of a heat pump system, characterized in that, The terminal of the heat pump system includes an indoor unit heat exchanger and a hot water tank, and the control method includes: When there is a heating demand and a hot water demand indoors, determine the maximum outlet water temperature of the heat pump system according to the heating demand and the hot water demand; Determine the range of the target operating frequency of the compressor corresponding to the maximum outlet water temperature according to the mapping relationship between the outlet water temperature and the compressor operating frequency; Control the compressor to operate within the target operating frequency range.

2. The method according to claim 1, characterized in that, Determining the maximum outlet water temperature of the heat pump system according to the heating demand and the hot water demand includes: Determine the first outlet water temperature corresponding to the heating demand and the second outlet water temperature corresponding to the hot water demand; Take the maximum value of the first outlet water temperature and the second outlet water temperature as the maximum outlet water temperature of the heat pump system.

3. The method according to claim 1, wherein Controlling the compressor to operate within the target operating frequency range includes: Control the compressor to operate at the minimum frequency within the target operating frequency range; and, Adjust the operating frequency of the compressor according to the real-time outlet water temperature.

4. The method according to claim 3, wherein Adjusting the operating frequency of the compressor according to the real-time outlet water temperature includes: When the real-time outlet water temperature is less than the maximum outlet water temperature, obtain the change rate of the real-time outlet water temperature; Adjust the operating frequency of the compressor according to the change rate of the real-time outlet water temperature.

5. The method according to claim 4, characterized in that, Adjusting the operating frequency of the compressor according to the change rate of the real-time outlet water temperature includes: When the change rate of the real-time outlet water temperature is less than the first rate, control the compressor to increase the frequency according to the first amplitude; When the change rate of the real-time outlet water temperature is greater than or equal to the first rate, control the compressor to maintain the current operating frequency, or control the compressor to increase the frequency according to the second amplitude; Wherein, the first amplitude is greater than the second amplitude.

6. The method according to any one of claims 1 to 5, characterized in that, After controlling the compressor to operate within the target operating frequency range, it further includes: Determine the correction coefficient according to the exhaust temperature and exhaust superheat of the compressor; Determine the target opening of the electronic expansion valve according to the determined correction coefficient, the current opening of the electronic expansion valve, and the change rate of the exhaust superheat; Control the electronic expansion valve to execute the target opening.

7. The method according to claim 6, wherein Determining the correction coefficient according to the exhaust temperature and exhaust superheat of the compressor includes: When the exhaust temperature is greater than the first temperature threshold and the exhaust superheat is greater than the first superheat threshold, determine that the correction coefficient is a value greater than the preset coefficient.

8. A control device for an outdoor unit of a heat pump system, comprising a processor and a memory storing program instructions, characterized in that, The processor is configured to execute the control method for the outdoor unit of the heat pump system according to any one of claims 1 to 7 when running the program instructions.

9. A heat pump system, characterized in that, Includes: Outdoor unit; The control device for the outdoor unit of the heat pump system according to claim 8, which is installed on the outdoor unit.

10. A computer-readable storage medium storing program instructions, characterized in that, When the program instructions are running, they are used to make the computer execute the control method for the outdoor unit of the heat pump system according to any one of claims 1 to 7.

Images