Heat pump unit and control method, device, equipment and medium thereof

Abstract

The present application relates to the field of heat pump technology, and provides a heat pump unit and its control method, device, equipment and medium, the method comprising: determining a target time range after the compressor is started; determining a set of upper limit parameters of parameter changes corresponding to each first control stage based on the first operating parameters of the heat pump unit in each first control stage within the target time range; configuring the frequency of the compressor in each first control stage stage by stage based on the upper limit of frequency changes in the set of upper limit parameters of parameter changes corresponding to each first control stage; configuring the opening of the throttling element in each first control stage stage by stage based on the upper limit of opening changes in the set of upper limit parameters of parameter changes corresponding to each first control stage. Based on the scheme of the present application, the operating stability of the heat pump unit can be effectively improved.

Description

Technical Field

[0001] The present application relates to the field of heat pump technology, and in particular to a heat pump unit and a control method, device, equipment and medium thereof. Background Art

[0002] A heat pump unit is a device used for heat exchange. In some cases, after the compressor of the heat pump unit is started, it may cause a protective shutdown due to excessive pressure or temperature, affecting the operating stability of the heat pump unit. Summary of the invention

[0003] The present application provides a heat pump unit and a control method, device, equipment and medium thereof, which can effectively improve the operating stability of the heat pump unit.

[0004] In a first aspect, a control method for a heat pump unit is provided, wherein the heat pump unit includes a compressor and a throttling element; the method includes:

[0005] Determine the target time frame after compressor startup;

[0006] Based on the first operating parameters of the heat pump unit in each first control stage within the target time range, determining a set of upper limits of parameter changes corresponding to each first control stage;

[0007] Based on the upper limit of frequency variation in the parameter variation upper limit set corresponding to each first control stage, configuring the frequency of the compressor in each first control stage step by step;

[0008] Based on the upper limit of the opening variation in the parameter variation upper limit set corresponding to each first control stage, the opening of the throttling element in each first control stage is configured stage by stage.

[0009] In a second aspect, a control device for a heat pump unit is provided, wherein the heat pump unit includes a compressor and a throttling element; the device includes:

[0010] A first determining unit, configured to determine a target time range after the compressor is started;

[0011] A second determining unit is used to determine a set of upper limits of parameter changes corresponding to each first control stage based on the first operating parameters of the heat pump unit in each first control stage within a target time range;

[0012] A first configuration unit, configured to configure the frequency of the compressor in each first control stage step by step based on the frequency variation upper limit in the parameter variation upper limit set corresponding to each first control stage;

[0013] The second configuration unit is used to configure the opening of the throttling element in each first control stage stage by stage based on the upper limit of the opening variation in the parameter variation upper limit set corresponding to each first control stage.

[0014] In a third aspect, a heat pump unit is provided, the heat pump unit comprising a compressor and a throttling element; the heat pump unit is configured to execute any one of the above control methods for a heat pump unit.

[0015] In a fourth aspect, an electronic device is provided, the electronic device comprising:

[0016] A memory for storing executable program codes;

[0017] The processor is used to call and run the executable program code from the memory, so that the electronic device executes any one of the control methods for the heat pump unit as described above.

[0018] In a fifth aspect, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed, any of the above control methods for a heat pump unit is implemented.

[0019] The beneficial effects brought by the technical solutions provided by some embodiments of the present application include at least: firstly, determining the target time range after the compressor is started, and further determining the set of upper limits of parameter changes corresponding to each first control stage based on the first operating parameters of the heat pump unit in each first control stage within the target time range. Using the set of upper limits of parameter changes corresponding to each first control stage, the frequency of the compressor in each first control stage and the opening of the throttling element in each first control stage are configured stage by stage to ensure that the parameter changes of the compressor and the throttling element are within a safe range, thereby avoiding protective shutdown of the heat pump unit and effectively improving the operating stability of the heat pump unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 is a structural schematic diagram of a heat pump unit provided in an embodiment of the present application;

[0022] Figure 2 It is a flow chart of a control method of a heat pump unit provided in an embodiment of the present application;

[0023] Figure 3 is a structural schematic diagram of a heat pump unit provided in an embodiment of the present application;

[0024] Figure 4It is a schematic diagram of a flow chart for determining a load state and a target time range provided in an embodiment of the present application;

[0025] Figure 5 is a schematic diagram of a flow chart for determining a load state provided in an embodiment of the present application;

[0026] Figure 6 is a schematic diagram of a flow chart for determining a load state provided in an embodiment of the present application;

[0027] Figure 7 is a schematic diagram of a flow chart for determining a load state provided in an embodiment of the present application;

[0028] Figure 8 is a schematic diagram of a flow chart for determining a load state provided in an embodiment of the present application;

[0029] Fig. 9 This is an example schematic diagram of a defrosting condition provided in an embodiment of the present application;

[0030] Fig.10 It is a flowchart of configuring the duration of the first control stage provided in an embodiment of the present application;

[0031] Fig.11 It is a flow chart of configuring the frequency and opening degree of the second control stage provided in an embodiment of the present application;

[0032] Fig.12 is a structural schematic diagram of a control device for a heat pump unit provided in an embodiment of the present application;

[0033] Fig.13 It is a structural schematic diagram of an electronic device provided in an embodiment of the present application.

[0034] Description of Figure Numbers:

[0035] DETAILED DESCRIPTION

[0036] In order to make the features and advantages of the present application more obvious and easy to understand, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0037] When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Instead, they are only examples of devices and methods consistent with some aspects of the present application as detailed in the attached claims.

[0038] In the following, the terms "first" and "second" are used for descriptive purposes only and should not be understood as suggesting or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features.

[0039] The following are detailed descriptions respectively. It should be noted that the description order of the following embodiments is not intended to limit the preferred order of the embodiments.

[0040] See also Figure 1 , Figure 1 Schematic diagram of the structure of a heat pump unit 1 provided in an embodiment of the present application. Figure 1 As shown, the heat pump unit 1 includes a compressor 10, a first heat exchanger 20, a throttling element 30, and a second heat exchanger 40. The second port of the compressor 10 is connected to the first port of the first heat exchanger 20, the second port of the first heat exchanger 20 is connected to the first port of the throttling element 30, the second port of the throttling element 30 is connected to the first port of the second heat exchanger 40, and the second port of the second heat exchanger 40 is connected to the first port of the compressor 10. In the heating mode, the refrigerant in the heat pump unit 1 flows through the compressor 10, the first heat exchanger 20, the throttling element 30, and the second heat exchanger 40 in sequence.

[0041] The liquid medium that exchanges heat with the heat pump unit 1 flows through the corresponding pipeline in the heat pump unit 1, so that the liquid medium exchanges heat with the first heat exchanger 20. It can be understood that in the heating mode, the liquid medium absorbs heat from the first heat exchanger 20 and is heated. This heating process utilizes the working principle of the heat pump unit 1, that is, through the compression action of the compressor 10, the heat released by the refrigerant in the first heat exchanger 20 is transferred to the liquid medium. In some cases, the liquid medium can be used by the water system 50, such as as a heat source to provide hot water or warm air for buildings or facilities. In some cases, the heat pump unit 1 and the water system 50 are both components of a certain device. For example, the heat pump unit 1 and the water system 50 are both components of a heat pump water heater.

[0042] based on Figure 1In the structure of the heat pump unit shown in the figure, after the compressor is started, the heat pump unit may quickly increase the frequency and close the valve to establish the exhaust superheat. Among them, the frequency increase and valve closing refers to the process in which the throttling element gradually closes or reduces the opening while the frequency of the compressor gradually increases. This process helps to quickly establish the exhaust superheat. Due to various reasons, the pressure and temperature of the refrigerant in the heat pump unit, or the temperature of the liquid medium that exchanges heat with the heat pump unit, may rise rapidly, causing the heat pump unit to shut down for protection, thereby affecting the operating stability of the heat pump unit.

[0043] In response to the above problems, the embodiment of the present application mainly proposes: first determine the target time range after the compressor is started, and determine the set of upper limits of parameter changes corresponding to each first control stage based on the first operating parameters of the heat pump unit in each first control stage within the target time range. Using the set of upper limits of parameter changes corresponding to each first control stage, the frequency of the compressor in each first control stage and the opening of the throttling element in each first control stage are configured stage by stage to ensure that the parameter changes of the compressor and the throttling element are within a safe range, avoid protective shutdown of the heat pump unit, and effectively improve the operating stability of the heat pump unit.

[0044] based on Figure 1 The structure shown is shown below. Figure 2 - Fig.11 , the control method of the heat pump unit provided in the embodiment of the present application is introduced in detail.

[0045] See also Figure 2 , Figure 2 A flow chart of a control method for a heat pump unit provided in an embodiment of the present application. Figure 2 As shown, the method of the embodiment of the present application may include the following steps S101-S104.

[0046] S101, determining a target time range after the compressor is started.

[0047] Specifically, the target time range involved in this embodiment refers to a period of time from the start of the compressor to the time when the heat pump unit reaches a relatively stable state or a predetermined operating state.

[0048] Regarding the process of determining the target time range after the compressor is started, in some possible implementations, the duration of the target time range is pre-configured. The timing duration is obtained from the time when the compressor is started, and the process of obtaining the timing duration can be implemented by a corresponding timer. Before the timing duration reaches the duration of the target time range, it can be considered to be within the target time range.

[0049] For example, assuming that the duration of the target time range is T dsh , T dshIt may be tens of seconds, minutes or other lengths of time. The timing duration T is obtained from the moment the compressor starts, and the timing duration T will increase over time. If T<T dsh This condition can be considered to be within the target time range.

[0050] S102: Determine a set of upper limits of parameter changes corresponding to each first control stage based on the first operating parameters of the heat pump unit in each first control stage within a target time range.

[0051] Specifically, each first control stage within the target time range refers to a plurality of different first control stages divided within the target time range. It should be noted that each first control stage within the target time range is arranged in chronological order.

[0052] The first operating parameters of the heat pump unit in each first control stage within the target time range refer to the main operating parameters of the heat pump unit in each first control stage, such as the frequency of the compressor, the opening of the throttling element, the pressure and temperature of the refrigerant, and the temperature of the liquid medium for heat exchange with the heat pump unit.

[0053] The set of upper limits of parameter changes corresponding to each first control stage refers to the set of upper limits set for the parameter changes of the compressor and the throttling element in each first control stage in order to ensure the operational stability and performance of the heat pump unit. For any first control stage, the set of upper limits of parameter changes corresponding to the first control stage includes both the upper limit of the frequency change of the compressor in the first control stage and the upper limit of the opening change of the throttling element in the first control stage.

[0054] Regarding the process of determining the set of upper limits of parameter changes corresponding to each first control stage based on the first operating parameters of each first control stage of the heat pump unit within the target time range, in some possible implementations, the mapping relationship between the first operating parameters and the upper limits of parameter changes can be recorded through a data table, a database, or other files that record data. For any first control stage, the set of upper limits of parameter changes corresponding to the first control stage can be determined based on the first control stage and the mapping relationship between the first operating parameters and the upper limits of parameter changes. In some possible implementations, the mapping relationship between the first operating parameters and the upper limits of parameter changes can be expressed as a corresponding mathematical function, and based on the first operating parameters of each first control stage of the heat pump unit within the target time range and the above-mentioned mathematical function, the set of upper limits of parameter changes corresponding to each first control stage can be calculated.

[0055] It should be noted that, since the first control stages within the target time range are arranged in chronological order, and the first operating parameters of the heat pump unit in different first control stages may be different, the set of upper limits of parameter changes corresponding to each first control stage is not determined at one time, but is determined in sequence. Exemplarily, assuming that there are adjacent first control stages A and B within the target time range, and the first control stage A is before the first control stage B, then the set of upper limits of parameter changes corresponding to the first control stage A can be determined based on the first operating parameters of the heat pump unit in the first control stage A; then, the set of upper limits of parameter changes corresponding to the first control stage B can be determined based on the first operating parameters of the heat pump unit in the first control stage B.

[0056] S103: Based on the upper limit of frequency variation in the parameter variation upper limit set corresponding to each first control stage, the frequency of the compressor in each first control stage is configured stage by stage.

[0057] Specifically, after determining the parameter change upper limit set corresponding to any first control stage within the target time range, the frequency of the compressor in the first control stage can be configured based on the frequency change upper limit in the parameter change upper limit set corresponding to the first control stage. The configuration process can be expressed as follows: if the first control stage is the first first control stage within the target time range, then the frequency change corresponding to the first control stage is determined below the frequency change upper limit corresponding to the first control stage, and the sum of the frequency change corresponding to the first control stage and the initial frequency is configured as the frequency of the compressor in the first control stage; if the first control stage is not the first first control stage within the target time range, then the frequency change corresponding to the first control stage is determined below the frequency change upper limit corresponding to the first control stage, and the sum of the frequency change corresponding to the first control stage and the frequency corresponding to the previous first control stage of the first control stage is configured as the frequency of the compressor in the first control stage.

[0058] It should be noted that the frequency of the compressor in each first control stage is configured stage by stage. For example, it is assumed that there are adjacent first control stages C and D within the target time range, and the first control stage C is before the first control stage D. Then, when configuring the frequency of the compressor in the first control stage D, it is necessary to take into account the frequency of the compressor in the first control stage C (or specifically the frequency of the compressor at the end of the first control stage C). Specifically, the frequency of the compressor in the first control stage C and the frequency change corresponding to the compressor in the first control stage D can be added, and the result of the addition can be used as the frequency of the compressor in the first control stage D. In this way, it can be ensured that the frequency change of the compressor within the target time range is within a safe range.

[0059] S104, configuring the opening of the throttling element in each first control stage step by step based on the upper limit of the opening variation in the parameter variation upper limit set corresponding to each first control stage.

[0060] Specifically, after determining the parameter variation upper limit set corresponding to any first control stage within the target time range, the opening of the throttling element in the first control stage can be configured based on the opening variation upper limit in the parameter variation upper limit set corresponding to the first control stage. The configuration process can be expressed as follows: if the first control stage is the first first control stage within the target time range, then the opening variation corresponding to the first control stage is determined below the opening variation upper limit corresponding to the first control stage, and the sum of the opening variation corresponding to the first control stage and the initial opening is configured as the opening of the throttling element in the first control stage; if the first control stage is not the first first control stage within the target time range, then the opening variation corresponding to the first control stage is determined below the opening variation upper limit corresponding to the first control stage, and the sum of the opening variation corresponding to the first control stage and the opening corresponding to the previous first control stage of the first control stage is configured as the opening of the throttling element in the first control stage.

[0061] It should be noted that the opening of the throttling element in each first control stage is configured stage by stage. For example, it is assumed that there are adjacent first control stages E and F within the target time range, and the first control stage E is before the first control stage F. Then, when configuring the opening of the throttling element in the first control stage F, it is necessary to take into account the opening of the throttling element in the first control stage E (or specifically the opening of the throttling element at the end of the first control stage E). Specifically, the opening of the throttling element in the first control stage E and the corresponding opening change of the throttling element in the first control stage F can be added, and the result of the addition can be used as the opening of the throttling element in the first control stage F. In this way, it can be ensured that the opening change of the throttling element within the target time range is within a safe range.

[0062] It is understandable that the above-mentioned method of configuring the compressor frequency and the opening of the throttling element in stages can be regarded as a variation of the proportional-integral (PI) regulation method, because it embodies the core of the proportional-integral regulation method, that is, according to the deviation between the current state and the desired state (here, it is expressed as the relationship between the parameter change amount of each first control stage and the corresponding parameter change amount upper limit), the control amount (the frequency of the compressor and the opening of the throttling element) is gradually adjusted through the role of proportion and integration, so that the output of the heat pump unit approaches the desired output state. Therefore, by configuring the compressor frequency and the opening of the throttling element in stages, the operating parameters of the heat pump unit can be effectively controlled.

[0063] It is understandable that in the related art, the heat pump unit will quickly increase the frequency and close the valve after the compressor is started to establish the exhaust gas superheat. In this embodiment, the heat pump unit will not quickly increase the frequency and close the valve after the compressor is started, but will adjust the frequency of the compressor and the opening of the throttling element within the target time range, which is equivalent to using a low-frequency and large-opening method to gradually allow the heat pump unit to enter a stable state.

[0064] In this embodiment, the target time range after the compressor is started is first determined, and based on the first operating parameters of each first control stage of the heat pump unit within the target time range, the set of upper limits of parameter changes corresponding to each first control stage is determined. Using the set of upper limits of parameter changes corresponding to each first control stage, the frequency of the compressor in each first control stage and the opening of the throttling element in each first control stage are configured stage by stage to ensure that the parameter changes of the compressor and the throttling element are within a safe range, thereby avoiding protective shutdown of the heat pump unit and effectively improving the operating stability of the heat pump unit.

[0065] In one embodiment, Figure 2 The step S102 of the illustrated embodiment is further refined and may include the following steps:

[0066] Determine the parameter change upper limit set corresponding to each first control stage based on the first operating parameter of each first control stage and the mapping relationship between the first operating parameter and the parameter change upper limit set;

[0067] The first operating parameter includes a first maximum value parameter and the exhaust temperature of the compressor in the corresponding first control stage. The first maximum value parameter is the maximum value between the detected temperature of the liquid medium for heat exchange with the heat pump unit in the corresponding first control stage and the saturated condensation temperature of the liquid medium under the exhaust pressure of the compressor in the corresponding first control stage.

[0068] Specifically, the mapping relationship between the first operating parameters and the parameter change upper limit set involved in this embodiment can be recorded in a data table, a database or other data recording files. Based on the first operating parameters of each first control stage and the mapping relationship between the first operating parameters and the parameter change upper limit set, the parameter change upper limit set corresponding to each first control stage is determined, which is actually to find or calculate the corresponding parameter change upper limit set in the mapping relationship according to the first operating parameters of each first control stage by searching or calculating.

[0069] Among them, the first operating parameter includes a first maximum value parameter and the exhaust temperature of the compressor in the corresponding first control stage. The first maximum value parameter is the maximum value between the detected temperature of the liquid medium for heat exchange with the heat pump unit in the corresponding first control stage and the saturated condensation temperature of the liquid medium under the exhaust pressure of the compressor in the corresponding first control stage.

[0070] The exhaust temperature of the compressor refers to the detected temperature of the refrigerant in the heat pump unit near the exhaust port of the compressor.

[0071] The detected temperature of the liquid medium for heat exchange with the heat pump unit refers to the actual temperature measured by a sensor or other detection means in the liquid medium for heat exchange with the heat pump unit.

[0072] The exhaust pressure of the compressor refers to the detected pressure of the refrigerant in the heat pump unit near the exhaust port of the compressor.

[0073] The saturated condensation temperature of the liquid medium under the exhaust pressure of the compressor refers to the temperature at which the liquid medium begins to condense into liquid under the exhaust pressure of the compressor.

[0074] The first maximum value parameter is the maximum value between the detected temperature of the liquid medium exchanging heat with the heat pump unit corresponding to the first control stage and the saturated condensation temperature of the liquid medium of the compressor at the exhaust pressure corresponding to the first control stage, which means that among these two temperatures, the maximum value is selected as the first maximum value parameter.

[0075] Exemplarily, the mapping relationship between the first operating parameter and the parameter change upper limit set is recorded in the data table, and the first operating parameter is specifically divided into the first operating parameter of the first dimension and the first operating parameter of the second dimension. The first operating parameter of the first dimension corresponds to the row in the data table, and the first operating parameter of the second dimension corresponds to the column in the data table. The different parameter change upper limit sets stored in the data table are located by row and column. Then, under the premise of determining the first operating parameter of the first dimension and the first operating parameter of the second dimension, the corresponding parameter change upper limit set can be determined from the data table.

[0076] In some cases, the parameters involved in the parameter change upper limit set may correspond to multiple parameter types, and a corresponding data table may be set for each parameter type. For example, a corresponding data table is set for the frequency change upper limit in the parameter change upper limit set, a corresponding data table is set for the opening change upper limit in the parameter change upper limit set, and so on.

[0077] For easier understanding of this embodiment, please refer to Figure 3 And Table 1, Table 2, Table 3, among which, Figure 3 It is a structural schematic diagram of a heat pump unit provided in an embodiment of the present application.

[0078] like Figure 3 As shown, the exhaust temperature of the compressor collected by the first temperature sensor 11 is recorded as T p . The outlet water temperature of the heat pump unit collected by the second temperature sensor 21 is recorded as Twout, and the inlet water temperature of the heat pump unit collected by the third temperature sensor 22 is recorded as Twin. The detected temperature of the liquid medium for heat exchange in the heat pump unit is recorded as Tw, and Tw is the maximum value between Twout and Twin, that is, Tw=Max(Twout, Twin). The exhaust pressure of the compressor collected by the first pressure sensor 12 is recorded as Pc, and the saturated condensing temperature of the liquid medium under the exhaust pressure of the compressor is recorded as f(Pc). The first maximum value parameter is recorded as Max(f(Pc),Tw).

[0079] Based on the first operating parameters of each first control stage, and the following Tables 1, 2, and 3, the set of upper limit parameters corresponding to each first control stage can be found, and the set of upper limit parameters includes the upper limit frequency change ΔFx max_n , opening change upper limit ΔEXV max_n , the upper limit of the duration change ΔEXV max_n , the subscript n is a positive integer, which is used to distinguish different upper limits of frequency change / upper limits of opening change / upper limits of duration change.

[0080] Table 1. Frequency change upper limit data table

[0081]

[0082] Table 2. Data table of upper limit of opening variation

[0083]

[0084] Table 3. Data table of upper limit of time variation

[0085]

[0086] In this embodiment, by introducing the first maximum value parameter as part of the first operating parameter and combining the mapping relationship between the first operating parameter and the parameter change upper limit set, the parameter change upper limit set of the heat pump unit in each first control stage can be determined efficiently and accurately.

[0087] In one embodiment, Figure 2 The step S103 of the illustrated embodiment is further refined and may include the following steps:

[0088] For any one of the multiple first control stages, if the target first control stage is the first first control stage among the multiple first control stages, a frequency change amount corresponding to the target first control stage is determined below an upper limit of the frequency change amount corresponding to the target first control stage, and a sum of the frequency change amount corresponding to the target first control stage and the initial frequency is configured as the frequency of the compressor in the target first control stage;

[0089] If the target first control stage is not the first first control stage among multiple first control stages, the frequency change amount corresponding to the target first control stage is determined below the upper limit of the frequency change amount corresponding to the target first control stage, and the sum of the frequency change amount corresponding to the target first control stage and the frequency corresponding to the previous first control stage of the target first control stage is configured as the frequency of the compressor in the target first control stage.

[0090] Specifically, the multiple first control stages within the target time range are arranged in chronological order, so it is necessary to configure the frequency of the compressor in each first control stage step by step according to the chronological order of each first control stage.

[0091] The target first control stage is any one of multiple first control stages within the target time range, that is, the target first control stage may be the first first control stage among the multiple first control stages, or may not be the first first control stage among the multiple first control stages.

[0092] If the target first control stage is the first first control stage among multiple first control stages, then when configuring the frequency of the compressor in the target first control stage, since there is no frequency of the previous first control stage as a reference, it is necessary to add the frequency change corresponding to the target first control stage to the initial frequency of the compressor. In other words, the frequency change corresponding to the target first control stage is added to the preset or default initial frequency, and the result of the addition is configured as the frequency of the compressor in the target first control stage. In this way, the frequency of the compressor in the target first control stage is adjusted based on the initial frequency and the upper limit of the allowed frequency change.

[0093] If the target first control stage is not the first first control stage among multiple first control stages, then when configuring the frequency of the compressor in the target first control stage, the frequency of the previous first control stage needs to be considered. In other words, the frequency change corresponding to the target first control stage is added to the frequency corresponding to the previous first control stage of the target first control stage (or specifically, the frequency of the compressor at the end of the previous first control stage), and the result of the addition is configured as the frequency of the compressor in the target first control stage. In this way, the frequency of the compressor in the target first control stage is adjusted based on the frequency of the previous stage and the upper limit of the frequency change in the current stage.

[0094] In this way, it can be ensured that the frequency change of the compressor within the target time range is continuous and controllable, thereby avoiding instability or protective shutdown of the heat pump unit caused by sudden frequency changes.

[0095] For example, assuming that the target first control stage is the nth first control stage among the plurality of first control stages, the frequency of the compressor in the target first control stage is denoted as Fx n , the initial frequency of the compressor is recorded as Fx 0 , the frequency change corresponding to the first control stage of the target is recorded as ΔFx, and the following relationship can be obtained:

[0096] Fx n =Fx n-1 +ΔFx

[0097] Based on this relationship, the frequency Fx of the compressor in the target first control stage can be calculated: n .

[0098] In this embodiment, for the first first control stage, by combining the initial frequency and the frequency change amount for configuration, a stable frequency basis is provided for the startup stage of the compressor. For the subsequent first control stages, by accumulating the frequency of the previous first control stage and the frequency change amount of the current first control stage, the continuity and consistency of the frequency configuration are ensured. The stage-by-stage configuration method of this embodiment effectively improves the operating efficiency and stability of the heat pump unit.

[0099] In one embodiment, Figure 2 The step S104 of the illustrated embodiment is further refined and may include the following steps:

[0100] For any one of the plurality of first control stages, if the target first control stage is the first first control stage among the plurality of first control stages, determining the opening change amount corresponding to the target first control stage below the opening change amount upper limit corresponding to the target first control stage, and configuring the sum of the opening change amount corresponding to the target first control stage and the initial opening as the opening of the throttling element in the target first control stage;

[0101] If the target first control stage is not the first first control stage among multiple first control stages, the opening change corresponding to the target first control stage is determined below the upper limit of the opening change corresponding to the target first control stage, and the sum of the opening change corresponding to the target first control stage and the opening corresponding to the previous first control stage of the target first control stage is configured as the opening of the throttling element in the target first control stage.

[0102] Specifically, the multiple first control stages within the target time range are arranged in chronological order, so it is necessary to configure the opening of the throttling element in each first control stage stage by stage according to the chronological order of each first control stage.

[0103] The target first control stage is any one of multiple first control stages within the target time range, that is, the target first control stage may be the first first control stage among the multiple first control stages, or may not be the first first control stage among the multiple first control stages.

[0104] If the target first control stage is the first first control stage among multiple first control stages, then when configuring the opening of the throttling element in the target first control stage, since there is no opening of the previous first control stage as a reference, it is necessary to add the opening change corresponding to the target first control stage to the initial opening of the throttling element. In other words, the opening change corresponding to the target first control stage is added to the preset or default initial opening, and the result of the addition is configured as the opening of the throttling element in the target first control stage. In this way, the opening of the throttling element in the target first control stage is adjusted based on the initial opening and the upper limit of the allowable opening change.

[0105] If the target first control stage is not the first first control stage among multiple first control stages, then when configuring the opening of the throttling element in the target first control stage, the opening of the previous first control stage needs to be considered. In other words, the opening change corresponding to the target first control stage is added to the opening corresponding to the previous first control stage of the target first control stage (or specifically, the opening of the throttling element at the end of the previous first control stage), and the result of the addition is configured as the opening of the throttling element in the target first control stage. In this way, the opening of the throttling element in the target first control stage is adjusted based on the opening of the previous stage and the upper limit of the opening change in the current stage.

[0106] In this way, it can be ensured that the opening change of the throttling element within the target time range is continuous and controllable, thereby avoiding instability or protective shutdown of the heat pump unit caused by sudden changes in the opening.

[0107] For example, assuming that the target first control stage is the nth first control stage among the plurality of first control stages, the opening degree of the throttling element in the target first control stage is recorded as EXV n , the initial opening of the throttling element is recorded as EXV 0 , the opening change corresponding to the first control stage of the target is recorded as ΔEXV, and the following relationship can be obtained:

[0108] EXV n =EXV n-1 +ΔEXV

[0109] Based on this relationship, the opening degree EXV of the throttling element in the target first control stage can be calculated: n .

[0110] In this embodiment, for the first control stage, the initial opening and the opening change are configured to provide a stable opening basis for the start-up stage of the throttling element. For the subsequent first control stages, the opening of the previous first control stage and the opening change of the current first control stage are accumulated to ensure the continuity and consistency of the opening configuration. The stage-by-stage configuration of this embodiment effectively improves the operating efficiency and stability of the heat pump unit.

[0111] See also Figure 4 , provides a flow chart of determining the load state and the target time range for the embodiment of the present application, such as Figure 4 As shown, the method of the embodiment of the present application may include the following steps S201-S202, and step S201 may be Figure 2 In the embodiment shown, step S101 is performed before step S202 can be used as a Figure 2 The detailed steps of step S101 of the embodiment are shown.

[0112] S201, determining a load state of the heat pump unit based on a second operating parameter of the heat pump unit before the compressor is started;

[0113] S202: When the load state of the heat pump unit is the target load state, determine a target time range after the compressor is started.

[0114] Specifically, before the compressor starts, the heat pump unit may experience situations such as too high refrigerant temperature, too high refrigerant pressure, too high liquid medium temperature, in and out defrosting conditions, and too much residual heat when the compressor is shut down, all of which may affect the load state of the heat pump unit. To this end, it is necessary to determine the load state of the heat pump unit based on the second operating parameter of the heat pump unit before the compressor starts. Among them, the load state of the heat pump unit represents the possible load of the heat pump unit predicted when the compressor starts based on historical data. The target load state is a type of load state of the heat pump unit, and in some cases the target load state can also be regarded as a high load state.

[0115] In some possible implementations, the second operating parameter of the heat pump unit before the compressor is started can be used to determine the load state of the heat pump unit by threshold comparison. For example, if the second operating parameter is higher than a certain temperature threshold or pressure threshold, the load state of the heat pump unit can be determined to be the target load state.

[0116] When the load state of the heat pump unit is the target load state, a target time range after the compressor is started is determined, and subsequent steps of configuring the frequency of the compressor and the opening degree of the throttling element in stages are performed.

[0117] When the load state of the heat pump unit is not the target load state, the heat pump unit can be controlled to quickly increase the frequency and close the valve to establish the exhaust superheat in time. This is because, under non-target load conditions, the heat pump unit may need to adjust its working state more quickly to adapt to the current operating environment or needs. By quickly increasing the frequency and closing the valve, the temperature and pressure of the refrigerant can be quickly increased, thereby establishing the exhaust superheat, allowing the heat pump unit to enter a stable working state more quickly.

[0118] In this embodiment, the load state of the heat pump unit is determined in advance based on the second operating parameter of the heat pump unit before the compressor is started, and then the target time range after the compressor is started is set when the load state is the target load state, and the subsequent control process based on the upper limit of the parameter change is executed, so that the heat pump unit can gradually enter a relatively stable operating state, effectively avoiding the protective shutdown of the heat pump unit and improving the operating stability of the heat pump unit.

[0119] See also Figure 5 , provides a flow chart of determining the load state for an embodiment of the present application. The second operating parameter includes the first exhaust temperature of the compressor at the time corresponding to the last shutdown, and the second exhaust temperature of the compressor at the current time. Figure 5 As shown, the method of the embodiment of the present application may include the following steps S301-S304, and steps S301-S304 may be used as Figure 4 The detailed steps of step S201 of the illustrated embodiment.

[0120] S301, determining the interval time from the time when the compressor last stopped to the current time;

[0121] S302, determining a third exhaust temperature after the first exhaust temperature decays over an interval time;

[0122] S303, if the second exhaust temperature is greater than the third exhaust temperature, determining that the load state of the heat pump unit is a target load state;

[0123] S304: If the second exhaust temperature is less than or equal to the third exhaust temperature, it is determined that the load state of the heat pump unit is not the target load state.

[0124] Specifically, this embodiment proposes a first method for determining the load state of the heat pump unit. First, it is necessary to determine the interval time from the corresponding moment when the compressor last stopped to the current moment. This process can be specifically performed by recording the corresponding moment when the compressor last stopped through a corresponding timer, and combining the current moment, calculating the interval time from the corresponding moment when the compressor last stopped to the current moment.

[0125] Then, a third exhaust temperature is determined after the first exhaust temperature decays after the interval time. In some possible implementations, the first exhaust temperature and the interval time can be used to query a corresponding data table to obtain the third exhaust temperature. In some possible implementations, the third exhaust temperature can be calculated using the first exhaust temperature, the interval time, and a thermodynamic model constructed for the heat pump unit.

[0126] If the second exhaust temperature is greater than the third exhaust temperature, it means that during the interval after the compressor is shut down, although the first exhaust temperature has decayed, the exhaust temperature at the current moment (i.e., the second exhaust temperature) is still higher than the expected temperature after decay (i.e., the third exhaust temperature), that is, the heat pump unit has accumulated more heat during the shutdown period, or the current ambient temperature is high, resulting in a higher load when the compressor is restarted. At this time, it can be determined that the load state of the heat pump unit is the target load state.

[0127] If the second exhaust temperature is less than or equal to the third exhaust temperature, it indicates that the exhaust temperature at the current moment (i.e., the second exhaust temperature) does not exceed the expected temperature after attenuation (i.e., the third exhaust temperature), that is, the heat pump unit has not accumulated too much heat during shutdown, or the current ambient temperature is moderate, and the load faced by the compressor when it restarts is relatively low. At this time, it can be determined that the load state of the heat pump unit is not the target load state.

[0128] For easier understanding of this embodiment, please refer to Figure 3 And Table 4 and Table 5.

[0129] like Figure 3 As shown, the ambient temperature of the environment where the heat pump unit 1 is located collected by the fifth temperature sensor 60 is recorded as Te, the frequency of the last shutdown time of the compressor 10 is recorded as Fx, the interval time from the last shutdown time of the compressor 10 to the current time is recorded as t, and the first exhaust temperature of the compressor at the last shutdown time is recorded as Tp max_n , the second exhaust temperature at the current moment is recorded as Tp. Combining the following Tables 4 and 5, it can be found that the third exhaust temperature after the first exhaust temperature decays after the interval time is recorded as CORTp max_n , the subscript n is a positive integer used to distinguish different third exhaust temperatures.

[0130] Table 4. Data table of the first exhaust temperature

[0131]

[0132] Table 5. The third exhaust temperature data table

[0133]

[0134] It is understandable that if Tp>CORTp max_n This condition can determine that the load state of the heat pump unit is the target load state.

[0135] In this embodiment, by introducing the first exhaust temperature of the compressor at the corresponding time of the last shutdown and the second exhaust temperature at the current time as the second operating parameter, and based on these parameters, reflecting the heat accumulation of the compressor after the shutdown, when the second exhaust temperature is higher than the third exhaust temperature after the interval time decays, it indicates that the heat pump unit has accumulated more heat during the shutdown period and faces a higher load. At this time, by configuring the parameters of the compressor and the throttling element in the target time range and in stages, the protective shutdown of the heat pump unit due to excessive load can be effectively avoided, ensuring the continuous and stable operation of the heat pump unit.

[0136] See also Figure 6 , provides a flow chart for determining the load state for an embodiment of the present application. Among them, the second operating parameter includes the first detected temperature of the liquid medium exchanging heat with the heat pump unit at the first target time, and the first target time is the time when the heat pump unit is in a steady-state heating condition. Figure 6 As shown, the method of the embodiment of the present application may include the following steps S401-S402, and steps S401-S402 may be used as Figure 4 The detailed steps of step S201 of the illustrated embodiment.

[0137] S401, if the difference between the detected temperature of the liquid medium at the current moment and the first detected temperature is greater than a preset first threshold, determining that the load state of the heat pump unit is a target load state;

[0138] S402: If the difference between the current detected temperature of the liquid medium and the first detected temperature is less than or equal to a preset first threshold, it is determined that the load state of the heat pump unit is not the target load state.

[0139] Specifically, this embodiment proposes a second way to determine the load state of the heat pump unit. The first reference temperature corresponding to the liquid medium refers to the reference temperature value that the liquid medium should reach when the heat pump unit is in a steady-state heating condition, representing the heat output level that the heat pump unit should provide under normal operating conditions. The preset first threshold refers to a threshold set to determine the load state of the heat pump unit.

[0140] If the difference between the current detected temperature of the liquid medium and the first detected temperature is greater than the preset first threshold, it indicates that the current detected temperature of the liquid medium is too high, exceeding the temperature of the steady-state operating condition, and there is a risk of system protection shutdown. At this time, it can be determined that the load state of the heat pump unit is the target load state.

[0141] If the difference between the detected temperature of the liquid medium at the current moment and the first detected temperature is less than or equal to the preset first threshold, it indicates that the detected temperature of the liquid medium at the current moment is within a reasonable range and does not exceed the temperature of the steady-state operating condition. At this time, it can be determined that the load state of the heat pump unit is not the target load state.

[0142] For easier understanding of this embodiment, please refer to Figure 3 .like Figure 3 As shown, the outlet water temperature of the heat pump unit collected by the second temperature sensor 21 is recorded as Twout, and the inlet water temperature of the heat pump unit collected by the third temperature sensor 22 is recorded as Twin; the detected temperature of the liquid medium for heat exchange of the heat pump unit at the current moment is recorded as Tw, Tw is the maximum value between Twout and Twin, that is, Tw=Max(Twout,Twin); the first detected temperature is recorded as Tw1; the preset first threshold is recorded as a.

[0143] It can be understood that if the condition of Tw-Tw1>a is satisfied, the load state of the heat pump unit can be determined to be the target load state.

[0144] In this embodiment, by introducing a preset first threshold value, the difference between the detected temperature of the liquid medium at the current moment and the first detected temperature is compared with the preset first threshold value, so that the load state of the heat pump unit can be accurately determined. When the above difference is greater than the preset first threshold value, it indicates that the heat pump unit is facing a high load. At this time, by configuring the parameters of the compressor and the throttling element in a stage-by-stage manner within the target time range, the protective shutdown of the heat pump unit due to excessive load can be effectively avoided, ensuring the continuous and stable operation of the heat pump unit.

[0145] In one embodiment, based on Figure 6 In the embodiment shown, the control method of the heat pump unit may further include the following steps:

[0146] Obtaining the duration during which the ambient temperature of the environment in which the heat pump unit is located is greater than a preset ambient temperature threshold, and the detected temperature of the refrigerant in the target heat exchanger of the heat pump unit is less than the preset refrigerant temperature threshold, where the target heat exchanger is a heat exchanger in the heat pump unit that exchanges heat with the environment in which the heat pump unit is located;

[0147] If the duration is less than the preset duration threshold, it is determined that the heat pump unit is in a steady-state heating condition.

[0148] Specifically, the ambient temperature of the environment in which the heat pump unit is located refers to the temperature of the environment around the heat pump unit when the heat pump unit is running. The ambient temperature can be measured by a relevant temperature sensor installed in the heat pump unit. The preset ambient temperature threshold and the preset refrigerant temperature threshold are both pre-set temperature values.

[0149] The target heat exchanger is the heat exchanger in the heat pump unit that exchanges heat with the surrounding environment. Figure 3 For example, the second heat exchanger 40 exchanges heat with the heat pump unit 1 and the environment, and adjusts the ambient temperature by absorbing or releasing heat, so the second heat exchanger 40 can be determined as the target heat exchanger. In some possible implementations, the target heat exchanger is a fin heat exchanger, and its fin structure can increase the heat exchange area and improve the heat exchange efficiency.

[0150] The duration refers to the duration that satisfies two conditions at the same time: the ambient temperature of the environment in which the heat pump unit is located is greater than the preset ambient temperature threshold, and the detected temperature of the refrigerant in the target heat exchanger of the heat pump unit is less than the preset refrigerant temperature threshold. The process of obtaining the duration can be specifically manifested as real-time monitoring of the ambient temperature and the temperature of the refrigerant in the target heat exchanger through relevant temperature sensors and pressure sensors. When the above two conditions are met at the same time, the timing starts, and the timing stops when one of the conditions is not met. The recorded time is the duration.

[0151] It is understandable that when the ambient temperature is high, the target heat exchanger should be able to absorb heat from the environment more easily, so the detected temperature of the refrigerant in the target heat exchanger will usually be relatively high. If the duration is less than the preset duration threshold, it indicates that the heat pump unit can provide heat stably and efficiently, and it can be determined that the heat pump unit is in a steady-state heating condition.

[0152] For easier understanding of this embodiment, please refer to Figure 3 .like Figure 3 As shown, the ambient temperature of the environment in which the heat pump unit 1 is located collected by the fifth temperature sensor 60 is recorded as Te, and the detected temperature of the refrigerant in the second heat exchanger 40 (as the target heat exchanger) collected by the fourth temperature sensor 41 is recorded as Tevap; the preset ambient temperature threshold is recorded as Te', the preset refrigerant temperature threshold is recorded as Tevap', and the preset duration threshold is recorded as t'.

[0153] The duration t that satisfies the two conditions of Te>Te' and Tevap<Tevap' is obtained. If t<t', it can be determined that the heat pump unit is in a steady-state heating condition.

[0154] In this embodiment, the ambient temperature and the detected temperature of the refrigerant in the target heat exchanger can be used to accurately determine the steady-state heating condition, providing a data basis for the subsequent determination of the load state of the heat pump unit.

[0155] See also Figure 7 , provides a flow chart of determining the load state for an embodiment of the present application. The second operating parameter includes a second detected temperature of the liquid medium exchanging heat with the heat pump unit at a second target time, and the second target time is the time when the liquid medium and the refrigerant in the heat pump unit stop flowing. Figure 7 As shown, the method of the embodiment of the present application may include the following steps S501-S502, and steps S501-S502 may be used as Figure 4 The detailed steps of step S201 of the illustrated embodiment.

[0156] S501, if the difference between the detected temperature of the liquid medium at the current moment and the second detected temperature is greater than a preset second threshold, determining that the load state of the heat pump unit is a target load state;

[0157] S501: If the difference between the current detected temperature of the liquid medium and the second detected temperature is less than or equal to a preset second threshold, it is determined that the load state of the heat pump unit is not the target load state.

[0158] Specifically, this embodiment proposes a third method for determining the load state of the heat pump unit.

[0159] The second target moment refers to the moment when the liquid medium and the refrigerant in the heat pump unit stop flowing. In some possible implementations, the flow state of the liquid medium and the flow state of the refrigerant in the heat pump unit can be detected by setting corresponding sensors. For example, a flow sensor can be set on the flow path of the liquid medium to monitor the flow of the liquid medium in real time; at the same time, a pressure sensor or a temperature sensor is set in the refrigerant circulation system of the heat pump unit to determine the flow state of the refrigerant by monitoring the pressure or temperature change of the refrigerant. When the flow sensor detects that the flow of the liquid medium is zero, and the pressure sensor or the temperature sensor detects that the pressure or temperature of the refrigerant no longer changes, it can be determined that the liquid medium and the refrigerant in the heat pump unit have stopped flowing, and this is the second target moment. In some possible implementations, the second target moment can also be determined by the operating state of the component that drives the liquid medium to flow (such as a liquid pump) and the operating state of the component that drives the refrigerant in the heat pump unit (such as a compressor). For example, when the liquid pump stops working, the flow of the liquid medium will also stop; when the compressor stops working, the refrigerant circulation in the heat pump unit will also stop. Therefore, the operating status of the liquid pump and the compressor can be monitored to determine whether the liquid medium and the refrigerant have stopped flowing, thereby determining the second target time.

[0160] The preset second threshold refers to a threshold set for determining the load state of the heat pump unit.

[0161] The difference between the current detected temperature of the liquid medium and the second detected temperature refers to the difference between the actual detected temperature of the liquid medium at the current moment and the detected temperature at the second target moment (i.e., the second detected temperature) after the liquid medium and the refrigerant in the heat pump unit stop flowing. This difference reflects the temperature change of the liquid medium after the refrigerant stops flowing.

[0162] If the current detected temperature of the liquid medium and the second detected temperature are greater than the preset second threshold, it means that after the refrigerant and the liquid medium stop flowing, the temperature of the liquid medium rises quickly. This may be because the heat pump unit has accumulated a lot of heat before shutdown, or the ambient temperature is high, causing the liquid medium to continue to be heated after shutdown. At this time, it can be determined that the load state of the heat pump unit is the target load state, that is, the heat pump unit may face a higher operating load.

[0163] If the detected temperature of the liquid medium at the current moment and the second detected temperature are less than or equal to the preset second threshold, it indicates that the temperature change of the liquid medium is within the expected range after the refrigerant and the liquid medium stop flowing. This reflects that the heat pump unit did not accumulate too much heat before shutdown, or the ambient temperature is moderate, and the temperature change of the liquid medium after shutdown is within the normal range. At this time, it can be determined that the load state of the heat pump unit is not the target load state, that is, the operating load of the heat pump unit is relatively low.

[0164] For easier understanding of this embodiment, please refer to Figure 3 .like Figure 3 As shown, the outlet water temperature of the heat pump unit collected by the second temperature sensor 21 is recorded as Twout, and the inlet water temperature of the heat pump unit collected by the third temperature sensor 22 is recorded as Twin; the detected temperature of the liquid medium for heat exchange of the heat pump unit at the current moment is recorded as Tw, Tw is the maximum value between Twout and Twin, that is, Tw=Max(Twout, Twin); the second detected temperature is recorded as Tw2; the preset second threshold is recorded as b.

[0165] It can be understood that if the condition of Tw-Tw2>b is satisfied, the load state of the heat pump unit can be determined to be the target load state.

[0166] In this embodiment, by introducing a preset second threshold value, the difference between the detected temperature of the liquid medium at the current moment and the second detected temperature is compared with the preset second threshold value, so that the load state of the heat pump unit can be accurately determined. When the above difference is greater than the preset second threshold value, it indicates that the heat pump unit is facing a high load. At this time, by configuring the parameters of the compressor and the throttling element in a stage-by-stage manner within the target time range, the protective shutdown of the heat pump unit due to excessive load can be effectively avoided, ensuring the continuous and stable operation of the heat pump unit.

[0167] In one embodiment, based on Figure 7 In the embodiment shown, the control method of the heat pump unit may further include the following steps:

[0168] If the liquid pump driving the liquid medium to flow is in a stopped state, and the compressor is in a stopped state, it is determined that the liquid medium and the refrigerant in the heat pump unit stop flowing.

[0169] Specifically, the liquid pump involved in this embodiment is a component used to drive the liquid medium to flow. The number of liquid pumps is at least one. In some cases, the at least one liquid pump includes a first liquid pump disposed in the heat pump unit. The first liquid pump is directly connected to the circulation pipeline of the heat pump unit. Therefore, the first liquid pump can be regarded as a built-in liquid pump of the heat pump unit. Figure 3 For example, the liquid pump 70 is disposed in the water outlet pipeline of the heat pump unit 1. In some cases, the at least one liquid pump further includes a second liquid pump disposed in the water system 50.

[0170] If the liquid pump that drives the liquid medium to flow is in a stopped state, and the compressor is also in a stopped state, it means that the circulation of the liquid medium and the refrigerant circulation have stopped, and no longer flow and heat exchange. Therefore, it can be determined that the liquid medium and the refrigerant in the heat pump unit have stopped flowing.

[0171] In this embodiment, the working status of the compressor and the liquid pump can be used to accurately determine the flow conditions of the liquid medium and the refrigerant, providing a data basis for the subsequent determination of the load status of the heat pump unit.

[0172] See also Figure 8 , provides a flow chart of determining the load state for the embodiment of the present application. Among them, the second operating parameter includes the third detected temperature of the liquid medium exchanging heat with the heat pump unit at the third target time and the fourth detected temperature at the fourth target time. The third target time is the time when the heat pump unit enters the defrosting condition, and the fourth target time is the time when the heat pump unit exits the defrosting condition. Figure 8 As shown, the method of the embodiment of the present application may include the following steps S601-S602, and steps S601-S602 may be used as Figure 4 The detailed steps of step S201 of the illustrated embodiment.

[0173] S601, if the fourth detected temperature is greater than the third detected temperature, determining that the load state of the heat pump unit is a target load state;

[0174] S602: If the fourth detected temperature is less than or equal to the third detected temperature, it is determined that the load state of the heat pump unit is not the target load state.

[0175] Specifically, this embodiment proposes a fourth method for determining the load state of the heat pump unit.

[0176] The defrosting condition of the heat pump unit refers to the condition in which, in the heating mode, the target heat exchanger (such as Figure 3 The surface of the second heat exchanger 40) is prone to frost, which affects the heat exchange efficiency. Therefore, a defrosting operation is required to remove the frost layer and restore the heat exchange performance.

[0177] The third target time refers to the time when the heat pump unit enters the defrost condition, that is, the time when the defrost operation begins. At this time, the operating state of the heat pump unit will change to remove the frost layer on the surface of the target heat exchanger. The fourth target time refers to the time when the heat pump unit exits the defrost condition, that is, the defrost operation is completed and the heat pump unit returns to the heating mode.

[0178] It is understandable that after the heat pump unit enters the defrost condition, the compressor of the heat pump unit will shut down accordingly. In addition, due to the melting of the frost layer on the surface of the target heat exchanger, the heat exchange performance of the target heat exchanger will gradually recover. Therefore, the detected temperature of the liquid medium exchanging heat with the heat pump unit will show a downward characteristic and a possible upward characteristic.

[0179] The third detected temperature of the liquid medium exchanging heat with the heat pump unit at the third target time represents the temperature state of the liquid medium before the heat pump unit enters the defrosting condition. The fourth detected temperature of the liquid medium exchanging heat with the heat pump unit at the fourth target time represents the temperature state of the liquid medium after the heat pump unit exits the defrosting condition.

[0180] If the fourth detection temperature is greater than the third detection temperature, it indicates that during the defrosting process, although the compressor is stopped and the refrigerant circulation is interrupted, the temperature of the liquid medium rises abnormally, which may be caused by high ambient temperature or other reasons. At this time, it can be determined that the load state of the heat pump unit is the target load state.

[0181] If the fourth detected temperature is less than or equal to the third detected temperature, it indicates that the temperature of the liquid medium after defrosting is completed does not exceed the temperature before defrosting. At this time, it can be determined that the load state of the heat pump unit is not the target load state.

[0182] For easier understanding of this embodiment, please refer to Figure 3 .like Figure 3As shown, the outlet water temperature of the heat pump unit at the third target time acquired by the second temperature sensor 21 is recorded as Twout1, and the inlet water temperature of the heat pump unit at the third target time acquired by the third temperature sensor 22 is recorded as Twin1; the detected temperature of the liquid medium for heat exchange of the heat pump unit at the third target time is recorded as Twst, and Twst is the maximum value of Twout1 and Twin1, that is, Twst=Max(Twout1, Twin1);

[0183] The outlet water temperature of the heat pump unit at the fourth target time collected by the second temperature sensor 21 is recorded as Twout2, and the inlet water temperature of the heat pump unit at the fourth target time collected by the third temperature sensor 22 is recorded as Twin2; the detected temperature of the liquid medium for heat exchange of the heat pump unit at the fourth target time is recorded as Tw, and Tw is the maximum value of Twout2 and Twin2, that is, Tw=Max(Twout2, Twin2).

[0184] It can be understood that if the condition of Tw>Twst is satisfied, the load state of the heat pump unit can be determined to be the target load state.

[0185] In this embodiment, by introducing the fourth detection temperature and the third detection temperature, and comparing the fourth detection temperature with the third detection temperature, the heat accumulation of the heat pump unit during the defrosting process can be determined. When the fourth detection temperature is greater than the third detection temperature, it indicates that the heat pump unit has accumulated more heat during the defrosting process and the load is high. At this time, by configuring the parameters of the compressor and the throttling element in the target time range and in stages, the protective shutdown of the heat pump unit due to excessive load can be effectively avoided, ensuring the continuous and stable operation of the heat pump unit.

[0186] In one embodiment, based on Figure 8 In the embodiment shown, the control method of the heat pump unit may further include the following steps:

[0187] Obtaining the detection temperature change rate of the liquid medium;

[0188] If the detected temperature change rate of the liquid medium is greater than a preset detected temperature change rate threshold, it is determined that the heat pump unit enters the defrosting condition.

[0189] Specifically, in the heating mode, the detected temperature of the liquid medium should remain relatively stable. If the detected temperature of the liquid medium decays to a certain extent, it may trigger the heat pump unit to enter the defrosting condition.

[0190] The detected temperature change rate of the liquid medium refers to the amount of change in the detected temperature per unit time, that is, the rate of change of the detected temperature over time. Regarding obtaining the detected temperature change rate of the liquid medium, it is specifically performed by monitoring the temperature of the liquid medium through a related temperature sensor and recording the detected temperature values ​​at different time points. Then, these detected temperature values ​​are used to calculate the temperature difference and time interval between adjacent time points, thereby obtaining the detected temperature change rate of the liquid medium.

[0191] The preset detection temperature change rate threshold refers to a threshold set in order to determine whether the heat pump unit needs to enter a defrosting condition.

[0192] If the detected temperature change rate of the liquid medium is greater than the preset detected temperature change rate threshold, it indicates that the temperature decay rate of the liquid medium exceeds the normal range. This may be due to severe frost on the surface of the target heat exchanger, resulting in a decrease in heat exchange efficiency. At this time, in order to ensure the normal operation and heating effect of the heat pump unit, it is necessary to trigger the heat pump unit to enter the defrosting condition, remove the frost layer on the surface of the target heat exchanger through the defrosting operation, and restore the heat exchange performance.

[0193] For easier understanding of this embodiment, please refer to Figure 3 .like Figure 3 As shown, the outlet water temperature of the heat pump unit collected by the second temperature sensor 21 is recorded as Twout. The detection temperature change rate of the liquid medium can be calculated based on Twout, which is recorded as dTwout / dT. In addition, the preset detection temperature change rate threshold is recorded as A.

[0194] It can be understood that if the condition of dTwout / dT>A is met, it can be determined that the heat pump unit enters the defrosting condition.

[0195] In this embodiment, the detected temperature change rate of the liquid medium and the preset detected temperature change rate threshold can be used to accurately determine the defrosting condition, providing a data basis for the subsequent determination of the load state of the heat pump unit.

[0196] In one embodiment, based on Figure 8 In the embodiment shown, the control method of the heat pump unit may further include the following steps:

[0197] Obtain the exhaust temperature change rate of the compressor;

[0198] If the exhaust temperature change rate of the compressor is greater than the preset exhaust temperature change rate threshold, it is determined that the heat pump unit enters the defrosting condition.

[0199] Specifically, in the heating mode, the exhaust temperature of the compressor should remain relatively stable. If the exhaust temperature of the compressor decays to a certain extent, it may trigger the heat pump unit to enter the defrosting condition.

[0200] The exhaust temperature change rate of the compressor refers to the change in exhaust temperature per unit time, that is, the rate of change of exhaust temperature over time. Regarding obtaining the exhaust temperature change rate of the compressor, it is specifically performed by monitoring the exhaust temperature of the compressor through relevant temperature sensors and recording the exhaust temperature values ​​at different time points. Then, these exhaust temperature values ​​are used to calculate the temperature difference and time interval between adjacent time points, thereby obtaining the exhaust temperature change rate of the compressor.

[0201] The preset exhaust temperature change rate threshold refers to a threshold set in order to determine whether the heat pump unit needs to enter a defrosting condition.

[0202] If the exhaust temperature change rate of the compressor is greater than the preset exhaust temperature change rate threshold, it indicates that the exhaust temperature decay rate of the compressor exceeds the normal range. This may be due to severe frost on the surface of the target heat exchanger, resulting in a decrease in heat exchange efficiency. At this time, in order to ensure the normal operation and heating effect of the heat pump unit, it is necessary to trigger the heat pump unit to enter the defrosting condition, remove the frost layer on the surface of the target heat exchanger through the defrosting operation, and restore the heat exchange performance.

[0203] For easier understanding of this embodiment, please refer to Figure 3 .like Figure 3 As shown, the exhaust temperature of the compressor collected by the first temperature sensor 11 is recorded as Tp. The exhaust temperature change rate of the compressor can be calculated based on Tp, recorded as dTp / dT. In addition, the preset exhaust temperature change rate threshold is recorded as B.

[0204] It can be understood that if the condition of dTp / dT>B is met, it can be determined that the heat pump unit enters the defrosting condition.

[0205] In this embodiment, the exhaust temperature change rate of the compressor and the preset exhaust temperature change rate threshold can be used to accurately determine the defrost condition, providing a data basis for the subsequent determination of the load state of the heat pump unit.

[0206] Combination Figure 8 For related examples, see Fig. 9 , Fig. 9 This is an example schematic diagram of a defrosting condition provided by an embodiment of the present application. Among them, the detected temperature change rate of the liquid medium corresponding to the first moment is greater than the preset detected temperature change rate threshold, and the exhaust temperature change rate of the compressor corresponding to the second moment is greater than the preset exhaust temperature change rate threshold. Therefore, the first moment and the second moment can both be determined as the moment when the heat pump unit enters the defrosting condition, that is, Figure 8 The third target time of the embodiment shown. In addition, the third time is the time when the heat pump unit exits the defrosting condition, that is, Figure 8The fourth target time of the illustrated embodiment: Between the first time and the third time, or between the second time and the third time, the compressor in the heat pump unit will experience shutdown.

[0207] See also Fig.10 , provides a flow chart of configuring the duration of the first control phase for an embodiment of the present application, such as Fig.10 As shown, the method of the embodiment of the present application may include the following steps S701. Step S701 may be Figure 2 In the illustrated embodiment, step S102 is performed afterwards.

[0208] S701, configuring the duration of each first control stage stage by stage based on the duration variation upper limit in the parameter variation upper limit set corresponding to each first control stage.

[0209] Specifically, after determining the parameter change upper limit set corresponding to any first control stage within the target time range, the duration of the first control stage can be configured based on the duration change upper limit in the parameter change upper limit set corresponding to the first control stage. The configuration process can be expressed as follows: if the target first control stage is the first first control stage within the target time range, then the duration change corresponding to the target first control stage is determined below the duration change upper limit corresponding to the target first control stage, and the sum of the duration change corresponding to the target first control stage and the initial duration is configured as the duration of the target first control stage; if the target first control stage is not the first first control stage within the target time range, then the duration change corresponding to the target first control stage is determined below the duration change upper limit corresponding to the target first control stage, and the sum of the duration change corresponding to the target first control stage and the duration corresponding to the previous first control stage of the target first control stage is configured as the duration of the target first control stage.

[0210] It should be noted that the duration of each first control stage is configured stage by stage. For example, it is assumed that there are adjacent first control stages G and H within the target time range, and the first control stage G is before the first control stage H. Then, when configuring the duration of the first control stage H, the duration of the first control stage G needs to be taken into account. Specifically, the duration of the first control stage G and the duration change corresponding to the first control stage H can be added, and the result of the addition is used as the duration of the first control stage H.

[0211] In this embodiment, by controlling the duration of each first control stage, it is possible to ensure that the heat pump unit smoothly transitions within the target time range, thereby avoiding unstable operation or low efficiency caused by improper setting of the duration of the first control stage.

[0212] In one embodiment, Fig.10The step S701 of the illustrated embodiment is further refined and may include the following steps:

[0213] For any one target first control stage among the multiple first control stages, if the target first control stage is the first first control stage among the multiple first control stages, the duration change amount corresponding to the target first control stage is determined below the upper limit of the duration change amount corresponding to the target first control stage, and the sum of the duration change amount corresponding to the target first control stage and the initial duration is configured as the duration of the target first control stage;

[0214] If the target first control stage is not the first first control stage among multiple first control stages, the duration change corresponding to the target first control stage is determined below the upper limit of the duration change corresponding to the target first control stage, and the sum of the duration change corresponding to the target first control stage and the duration corresponding to the previous first control stage of the target first control stage is configured as the duration of the target first control stage.

[0215] Specifically, the multiple first control stages within the target time range are arranged in chronological order, so it is necessary to configure the duration of each first control stage stage by stage according to the chronological order of each first control stage.

[0216] The target first control stage is any one of multiple first control stages within the target time range, that is, the target first control stage may be the first first control stage among the multiple first control stages, or may not be the first first control stage among the multiple first control stages.

[0217] If the target first control stage is the first first control stage among multiple first control stages, then when configuring the duration of the target first control stage, since there is no duration of the previous first control stage as a reference, it is necessary to add the duration change corresponding to the target first control stage to the initial duration. In other words, the duration change corresponding to the target first control stage is added to the preset or default initial duration, and the result of the addition is configured as the duration of the target first control stage. In this way, the duration of the target first control stage is adjusted based on the initial duration and the upper limit of the allowed duration change.

[0218] If the target first control stage is not the first first control stage among multiple first control stages, then when configuring the duration of the target first control stage, the duration of the previous first control stage needs to be considered. In other words, the duration change corresponding to the target first control stage is added to the duration corresponding to the previous first control stage of the target first control stage, and the result of the addition is configured as the duration of the target first control stage. In this way, the duration of the target first control stage is adjusted based on the duration of the previous stage and the upper limit of the duration change of the current stage.

[0219] For example, assuming that the target first control stage is the nth first control stage among the multiple first control stages, the duration of the target first control stage is t n , the initial duration is recorded as t 0 , the duration change corresponding to the first control stage of the target is recorded as Δt, and the following relationship can be obtained:

[0220] t n =t n-1 +Δt

[0221] Based on this relationship, the duration t of the first control stage of the target can be calculated: n .

[0222] In this embodiment, for the first first control stage, by combining the initial duration and the duration change, a stable duration basis is provided for the heat pump unit control. For the subsequent first control stages, the duration of the previous first control stage and the duration change of the current first control stage are accumulated to ensure the continuity and consistency of the duration configuration. The stage-by-stage configuration method of this embodiment effectively improves the operating efficiency and stability of the heat pump unit.

[0223] See also Fig.11 , provides a flow chart of configuring the frequency and opening of the second control stage for the embodiment of the present application, such as Fig.11 As shown, the method of the embodiment of the present application may include the following steps S801-S803, and steps S801-S803 may be Figure 2 The illustrated embodiment is executed after step S104.

[0224] S801, determining a parameter change amount set corresponding to each second control stage based on the third operating parameter of the heat pump unit in each second control stage after the target time range;

[0225] S802, configuring the frequency of the compressor in each second control stage step by step based on the frequency variation in the parameter variation set corresponding to each second control stage;

[0226] S803: Based on the opening variation in the parameter variation set corresponding to each second control stage, the opening of the throttling element in each second control stage is configured stage by stage.

[0227] Specifically, after the target time range is controlled, the heat pump unit reaches a relatively stable state. At this time, the heat pump unit can be controlled to quickly increase the frequency and close the valve to establish the exhaust superheat. The target time range is also divided into multiple second control stages to more accurately control the operating state of the heat pump unit. For a second control stage, it is necessary to determine the parameter change amount set corresponding to the second control stage based on the third operating parameter of the second control stage.

[0228] The third operating parameter of the second control stage refers to the main operating parameters of the heat pump unit in the second control stage, including but not limited to the frequency of the compressor, the opening of the throttling element, the pressure and temperature of the refrigerant, and the temperature of the liquid medium for heat exchange with the heat pump unit. The parameter change amount set corresponding to the second control stage refers to the set of parameter change amounts set for the relevant components in the heat pump unit in each second control stage in order to ensure the continuous stable operation and performance optimization of the heat pump unit.

[0229] For any second control stage, the frequency of the compressor in the second control stage can be configured based on the upper limit of the frequency change in the parameter change upper limit set corresponding to the second control stage. The configuration process can be expressed as follows: if the second control stage is the first second control stage, then the frequency change corresponding to the second control stage is determined below the upper limit of the frequency change corresponding to the second control stage, and the sum of the frequency change corresponding to the second control stage and the frequency of the compressor at the end of the target time range is configured as the frequency of the compressor in the second control stage; if the second control stage is not the first second control stage, then the frequency change corresponding to the second control stage is determined below the upper limit of the frequency change corresponding to the second control stage, and the sum of the frequency change corresponding to the second control stage and the frequency corresponding to the previous second control stage of the second control stage is configured as the frequency of the compressor in the second control stage.

[0230] For any second control stage, the opening of the throttling element in the second control stage can be configured based on the upper limit of the opening variation in the parameter variation upper limit set corresponding to the second control stage. The configuration process can be expressed as follows: if the second control stage is the first second control stage, the opening variation corresponding to the second control stage is determined below the upper limit of the opening variation corresponding to the second control stage, and the sum of the opening variation corresponding to the second control stage and the opening of the throttling element at the end of the target time range is configured as the opening of the throttling element in the second control stage; if the second control stage is not the first second control stage, the opening variation corresponding to the second control stage is determined below the upper limit of the opening variation corresponding to the second control stage, and the sum of the opening variation corresponding to the second control stage and the opening corresponding to the previous second control stage of the second control stage is configured as the opening of the throttling element in the second control stage.

[0231] In this embodiment, after the target time range, by introducing the third operating parameters of each second control stage and determining the corresponding parameter change set based on these parameters, and then configuring the frequency and opening of the compressor and throttling element stage by stage, the heat pump unit is helped to quickly establish the exhaust superheat and improve the operating stability of the heat pump unit.

[0232] In one embodiment, Fig.11 The step S801 of the illustrated embodiment is further refined and may include the following steps:

[0233] Determine the parameter variation set corresponding to each second control stage based on the third operating parameter of each second control stage and the mapping relationship between the third operating parameter and the parameter variation set;

[0234] The third operating parameter includes a second maximum parameter and a first minimum parameter. The second maximum parameter is the maximum value between the exhaust temperature change rate and the exhaust pressure change rate of the compressor in the corresponding second control stage. The first minimum parameter is the minimum value between the exhaust temperature margin and the exhaust pressure margin of the compressor in the corresponding second control stage. The exhaust temperature margin is the difference between the exhaust temperature of the compressor in the corresponding second control stage and the preset exhaust temperature protection value. The exhaust pressure margin is the difference between the exhaust pressure of the compressor in the corresponding second control stage and the preset exhaust pressure protection value.

[0235] Specifically, if Figure 3 As shown, the exhaust temperature of the compressor 10 can be acquired by using the first temperature sensor 11 , and the exhaust pressure of the compressor 10 can be acquired by using the first pressure sensor 12 .

[0236] The exhaust temperature change rate of the compressor refers to the amount of change in the exhaust temperature per unit time, that is, the rate of change of the exhaust temperature over time. With regard to obtaining the exhaust temperature change rate of the compressor, it is specifically performed by monitoring the temperature of the compressor through relevant temperature sensors, and recording the exhaust temperature values ​​at different time points. Then, these exhaust temperature values ​​are used to calculate the temperature difference and time interval between adjacent time points, thereby obtaining the exhaust temperature change rate of the compressor. Similarly, the exhaust pressure change rate of the compressor refers to the amount of change in the exhaust pressure per unit time, that is, the rate of change of the exhaust pressure over time. With regard to obtaining the exhaust pressure change rate of the compressor, it is specifically performed by monitoring the pressure of the compressor through relevant pressure sensors, and recording the exhaust pressure values ​​at different time points. Then, these exhaust pressure values ​​are used to calculate the pressure difference and time interval between adjacent time points, thereby obtaining the exhaust pressure change rate of the compressor.

[0237] The preset exhaust temperature protection value refers to an exhaust temperature upper limit value set to prevent the compressor from overheating. When the exhaust temperature of the compressor approaches or exceeds this value, it means that the compressor may be in an overheated state and corresponding protection measures need to be taken, such as reducing the frequency of the compressor or shutting down. Therefore, the exhaust temperature margin represents the distance between the current exhaust temperature of the compressor and the preset exhaust temperature protection value, that is, how much margin the compressor has from overheating. The larger the exhaust temperature margin, the safer the current operation of the compressor; the smaller the exhaust temperature margin, the closer the compressor is to overheating.

[0238] The preset exhaust pressure protection value refers to an exhaust pressure upper limit value set to prevent the compressor exhaust pressure from being too high. When the compressor exhaust pressure approaches or exceeds this value, it means that the compressor may be in an overpressure state and corresponding protection measures must also be taken.

[0239] Therefore, the exhaust pressure margin represents the distance between the current exhaust pressure of the compressor and the preset exhaust pressure protection value, that is, how much margin the compressor has from the overpressure state. The larger the exhaust pressure margin, the safer the current operation of the compressor; the smaller the exhaust pressure margin, the closer the compressor is to the overpressure state.

[0240] For easier understanding of this embodiment, please refer to Figure 3 And Table 6, Table 7, among which, Figure 3 It is a structural schematic diagram of a heat pump unit provided in an embodiment of the present application.

[0241] like Figure 3 As shown, the exhaust temperature of the compressor collected by the first temperature sensor 11 is recorded as Tp, and the rate of change of the exhaust temperature of the compressor is recorded as dTp / dT; the exhaust pressure of the compressor collected by the first pressure sensor 12 is recorded as Pc. The rate of change of the exhaust pressure of the compressor is recorded as dPc / dT. The second maximum value parameter is the maximum value of dTp / dT and dPc / dT, recorded as Max(dTp / dT,dPc / dT).

[0242] The preset exhaust temperature protection value is recorded as Tppr, and the exhaust temperature margin is recorded as Tp-Tppr; the preset exhaust pressure protection value is recorded as Pcpr, and the exhaust pressure margin is recorded as Pc-Pcpr. The first minimum parameter is the minimum value of Tp-Tppr and Pc-Pcpr, recorded as Min(Tp-Tppr,Pc-Pcpr).

[0243] Based on the third operating parameters of each second control stage, as well as Tables 6 and 7 below, the parameter change set corresponding to each first control stage can be found. The parameter change set includes frequency change Δfx_n and opening change Δexv_n, where n is a positive integer used to distinguish different frequency changes / opening changes.

[0244] Table 6. Frequency change data table

[0245]

[0246] Table 7. Opening change data table

[0247]

[0248] In some cases, the frequency change in Table 6 can be configured to be positively correlated with the first minimum parameter and negatively correlated with the second maximum parameter; the frequency change in Table 7 can be configured to be negatively correlated with the first minimum parameter and positively correlated with the second maximum parameter.

[0249] In this embodiment, by introducing the second maximum value parameter and the first minimum value parameter as the third operating parameter, and combining the mapping relationship between these parameters and the parameter change amount set, the parameter change amount set of the heat pump unit in each second control stage is accurately determined. In addition, by comprehensively considering the exhaust temperature change rate, exhaust pressure change rate, exhaust temperature margin and exhaust pressure margin of the compressor, the working state of the compressor and the throttling element can be adjusted more accurately, avoiding unstable operation or reduced efficiency caused by sudden parameter changes, and effectively improving the overall operating efficiency and heating performance of the heat pump unit.

[0250] Based on the above Figure 1 The structure of Fig.12 The control device of the heat pump unit provided in the embodiment of the present application is introduced in detail. It should be noted that: Fig.12 The control device of the heat pump unit in the present application is used to execute Figure 2 - Fig.11 For the convenience of explanation, only the part related to the embodiment of the present application is shown. For the specific technical details not disclosed, please refer to the present application. Figure 2 - Fig.11 Specifically, the control device 900 of the heat pump unit may include a compressor, a throttling element, a first determination unit 901, a second determination unit 902, a first configuration unit 903, and a second configuration unit 904, as follows:

[0251] A first determining unit 901 is used to determine a target time range after the compressor is started;

[0252] The second determining unit 902 is used to determine a set of upper limits of parameter changes corresponding to each first control stage based on the first operating parameters of the heat pump unit in each first control stage within the target time range;

[0253] A first configuration unit 903 is used to configure the frequency of the compressor in each first control stage step by step based on the frequency variation upper limit in the parameter variation upper limit set corresponding to each first control stage;

[0254] The second configuration unit 904 is used to configure the opening of the throttling element in each first control stage stage by stage based on the upper limit of the opening variation in the parameter variation upper limit set corresponding to each first control stage.

[0255] Optionally, in some embodiments, the control device 900 of the heat pump unit can be used to: determine the load state of the heat pump unit based on the second operating parameter of the heat pump unit before the compressor is started; the first determination unit 901 can be used to: when the load state of the heat pump unit is the target load state, determine the target time range after the compressor is started.

[0256] Optionally, in some embodiments, the second operating parameter includes a first exhaust temperature at a corresponding time when the compressor was last shut down, and a second exhaust temperature at a current time when the compressor is currently shut down; the control device 900 of the heat pump unit can be used to: determine the interval time from the corresponding time when the compressor was last shut down to the current time; determine a third exhaust temperature after the first exhaust temperature decays after the interval time; if the second exhaust temperature is greater than the third exhaust temperature, determine that the load state of the heat pump unit is a target load state; if the second exhaust temperature is less than or equal to the third exhaust temperature, determine that the load state of the heat pump unit is not a target load state.

[0257] Optionally, in some embodiments, the second operating parameter includes a first detected temperature of a liquid medium that exchanges heat with the heat pump unit at a first target moment, the first target moment being the moment when the heat pump unit is in a steady-state heating condition; the control device 900 of the heat pump unit can be used to: if the difference between the detected temperature of the liquid medium at the current moment and the first detected temperature is greater than a preset first threshold value, determine that the load state of the heat pump unit is a target load state; if the difference between the detected temperature of the liquid medium at the current moment and the first detected temperature is less than or equal to the preset first threshold value, determine that the load state of the heat pump unit is not a target load state.

[0258] Optionally, in some embodiments, the control device 900 of the heat pump unit can be used to: obtain the duration during which the ambient temperature of the environment in which the heat pump unit is located is greater than a preset ambient temperature threshold, and the detected temperature of the refrigerant in the target heat exchanger of the heat pump unit is less than a preset refrigerant temperature threshold, the target heat exchanger being a heat exchanger in the heat pump unit that exchanges heat with the environment in which it is located; if the duration is less than the preset duration threshold, it is determined that the heat pump unit is in a steady-state heating condition.

[0259] Optionally, in some embodiments, the second operating parameter includes a second detected temperature of the liquid medium that exchanges heat with the heat pump unit at a second target time, and the second target time is the time when the liquid medium and the refrigerant in the heat pump unit stop flowing; the control device 900 of the heat pump unit can be used to: if the difference between the detected temperature of the liquid medium at the current time and the second detected temperature is greater than a preset second threshold value, determine that the load state of the heat pump unit is a target load state; if the difference between the detected temperature of the liquid medium at the current time and the second detected temperature is less than or equal to the preset second threshold value, determine that the load state of the heat pump unit is not the target load state.

[0260] Optionally, in some embodiments, the control device 900 of the heat pump unit can be used to determine that the liquid medium and the refrigerant in the heat pump unit stop flowing if the liquid pump driving the liquid medium to flow is in a stopped state and the compressor is in a stopped state.

[0261] Optionally, in some embodiments, the second operating parameter includes a third detected temperature of the liquid medium for exchanging heat with the heat pump unit at a third target time and a fourth detected temperature at a fourth target time, the third target time being the time when the heat pump unit enters the defrost condition, and the fourth target time being the time when the heat pump unit exits the defrost condition; the control device 900 of the heat pump unit can be used to: if the fourth detected temperature is greater than the third detected temperature, determine that the load state of the heat pump unit is the target load state; if the fourth detected temperature is less than or equal to the third detected temperature, determine that the load state of the heat pump unit is not the target load state.

[0262] Optionally, in some embodiments, the control device 900 of the heat pump unit can be used to: obtain the detected temperature change rate of the liquid medium; if the detected temperature change rate of the liquid medium is greater than a preset detected temperature change rate threshold, determine that the heat pump unit enters the defrosting condition.

[0263] Optionally, in some embodiments, the control device 900 of the heat pump unit can be used to: obtain the exhaust temperature change rate of the compressor; if the exhaust temperature change rate of the compressor is greater than a preset exhaust temperature change rate threshold, determine that the heat pump unit enters the defrost condition.

[0264] Optionally, in some embodiments, the second determination unit 902 can be used to: determine the set of upper limits of parameter changes corresponding to each first control stage based on the first operating parameters of each first control stage and the mapping relationship between the first operating parameters and the set of upper limits of parameter changes; the first operating parameters include a first maximum value parameter and the exhaust temperature of the compressor in the corresponding first control stage, and the first maximum value parameter is the maximum value between the detected temperature of the liquid medium for heat exchange with the heat pump unit in the corresponding first control stage and the saturated condensing temperature of the liquid medium under the exhaust pressure of the compressor in the corresponding first control stage.

[0265] Optionally, in some embodiments, the control device 900 of the heat pump unit can be used to configure the duration of each first control stage stage by stage based on the duration variation upper limit in the parameter variation upper limit set corresponding to each first control stage.

[0266] Optionally, in some embodiments, the control device 900 of the heat pump unit can be used for: for any target first control stage among multiple first control stages, if the target first control stage is the first first control stage among the multiple first control stages, then the duration change corresponding to the target first control stage is determined below the upper limit of the duration change corresponding to the target first control stage, and the sum of the duration change corresponding to the target first control stage and the initial duration is configured as the duration of the target first control stage; if the target first control stage is not the first first control stage among the multiple first control stages, then the duration change corresponding to the target first control stage is determined below the upper limit of the duration change corresponding to the target first control stage, and the sum of the duration change corresponding to the target first control stage and the duration corresponding to the previous first control stage of the target first control stage is configured as the duration of the target first control stage.

[0267] Optionally, in some embodiments, the first configuration unit 903 can be used to: for any target first control stage among multiple first control stages, if the target first control stage is the first first control stage among multiple first control stages, then determine the frequency change corresponding to the target first control stage below the upper limit of the frequency change corresponding to the target first control stage, and configure the sum of the frequency change corresponding to the target first control stage and the initial frequency as the frequency of the compressor in the target first control stage; if the target first control stage is not the first first control stage among multiple first control stages, then determine the frequency change corresponding to the target first control stage below the upper limit of the frequency change corresponding to the target first control stage, and configure the sum of the frequency change corresponding to the target first control stage and the frequency corresponding to the previous first control stage of the target first control stage as the frequency of the compressor in the target first control stage.

[0268] Optionally, in some embodiments, the second configuration unit 904 can be used to: for any target first control stage among multiple first control stages, if the target first control stage is the first first control stage among multiple first control stages, then determine the opening change corresponding to the target first control stage below the upper limit of the opening change corresponding to the target first control stage, and configure the sum of the opening change corresponding to the target first control stage and the initial opening as the opening of the throttling element in the target first control stage; if the target first control stage is not the first first control stage among multiple first control stages, then determine the opening change corresponding to the target first control stage below the upper limit of the opening change corresponding to the target first control stage, and configure the sum of the opening change corresponding to the target first control stage and the opening corresponding to the previous first control stage of the target first control stage as the opening of the throttling element in the target first control stage.

[0269] Optionally, in some embodiments, the control device 900 of the heat pump unit can be used to: determine a set of parameter changes corresponding to each second control stage based on the third operating parameters of the heat pump unit in each second control stage after the target time range; configure the frequency of the compressor in each second control stage stage by stage based on the frequency change in the set of parameter changes corresponding to each second control stage; configure the opening of the throttling element in each second control stage stage by stage based on the opening change in the set of parameter changes corresponding to each second control stage.

[0270] Optionally, in some embodiments, the control device 900 of the heat pump unit can be used to: determine the parameter change set corresponding to each second control stage based on the third operating parameter of each second control stage, and the mapping relationship between the third operating parameter and the parameter change set; the third operating parameter includes a second maximum value parameter and a first minimum value parameter, the second maximum value parameter is the maximum value between the exhaust temperature change rate and the exhaust pressure change rate of the compressor in the corresponding second control stage, the first minimum value parameter is the minimum value between the exhaust temperature margin and the exhaust pressure margin of the compressor in the corresponding second control stage, the exhaust temperature margin is the difference between the exhaust temperature of the compressor in the corresponding second control stage and the preset exhaust temperature protection value, and the exhaust pressure margin is the difference between the exhaust pressure of the compressor in the corresponding second control stage and the preset exhaust pressure protection value.

[0271] The effects that can be achieved by this embodiment can be found in the relevant embodiments of the control method of the heat pump unit mentioned above, which will not be described in detail here.

[0272] Accordingly, the embodiment of the present application also provides an electronic device 900. Fig.13 , Fig.131 is a schematic diagram of the structure of an electronic device provided in an embodiment of the present application. The electronic device 900 includes a processor 901 and a memory 902. The processor 901 is electrically connected to the memory 902.

[0273] Processor 901 is the control center of electronic device 900. It uses various interfaces and lines to connect various parts of the entire electronic device. It executes various functions of the electronic device and processes data by running or calling executable program codes stored in memory 902, and calling data stored in memory 902, thereby monitoring the electronic device as a whole.

[0274] The memory 902 can be used to store executable program codes and modules. The processor 901 executes various functional applications and controls the heat pump unit by running the executable program codes and modules stored in the memory 902. The memory 902 can mainly include a program storage area and a data storage area, wherein the program storage area can store an operating system, executable program codes required for at least one function, etc.; the data storage area can store data created according to the use of the electronic device, etc.

[0275] In addition, the memory 902 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, or other volatile solid-state storage devices. Accordingly, the memory 902 may also include a memory controller to provide the processor 901 with access to the memory 902.

[0276] In this embodiment, the heat pump unit includes a compressor and a throttling element; the processor 901 in the electronic device 900 will load instructions corresponding to one or more executable program code processes into the memory 902 according to the following steps, and the processor 901 will run the executable program code stored in the memory 902 to achieve various functions, as follows:

[0277] Determine the target time frame after compressor startup;

[0278] Based on the first operating parameters of the heat pump unit in each first control stage within the target time range, determining a set of upper limits of parameter changes corresponding to each first control stage;

[0279] Based on the upper limit of frequency variation in the parameter variation upper limit set corresponding to each first control stage, configuring the frequency of the compressor in each first control stage step by step;

[0280] Based on the upper limit of the opening variation in the parameter variation upper limit set corresponding to each first control stage, the opening of the throttling element in each first control stage is configured stage by stage.

[0281] Optionally, before executing to determine the target time range after the compressor is started, the processor 901 specifically executes: determining the load state of the heat pump unit based on the second operating parameter of the heat pump unit before the compressor is started; when the processor 901 executes to determine the target time range after the compressor is started, the processor 901 specifically executes: determining the target time range after the compressor is started when the load state of the heat pump unit is the target load state.

[0282] Optionally, the second operating parameter includes the first exhaust temperature at the corresponding moment of the last shutdown of the compressor, and the second exhaust temperature of the compressor at the current moment; when the processor 901 determines the load state of the heat pump unit based on the second operating parameter of the heat pump unit before the compressor is started, it specifically performs: determining the interval time from the corresponding moment of the last shutdown of the compressor to the current moment; determining the third exhaust temperature after the first exhaust temperature decays after the interval time; if the second exhaust temperature is greater than the third exhaust temperature, determining that the load state of the heat pump unit is the target load state; if the second exhaust temperature is less than or equal to the third exhaust temperature, determining that the load state of the heat pump unit is not the target load state.

[0283] Optionally, the second operating parameter includes a first detected temperature of the liquid medium that exchanges heat with the heat pump unit at a first target moment, and the first target moment is the moment when the heat pump unit is in a steady-state heating condition; when the processor 901 determines the load state of the heat pump unit based on the second operating parameter of the heat pump unit before the compressor is started, it specifically executes: if the difference between the detected temperature of the liquid medium at the current moment and the first detected temperature is greater than a preset first threshold value, it is determined that the load state of the heat pump unit is the target load state; if the difference between the detected temperature of the liquid medium at the current moment and the first detected temperature is less than or equal to the preset first threshold value, it is determined that the load state of the heat pump unit is not the target load state.

[0284] Optionally, the processor 901 can also execute: obtaining the duration during which the ambient temperature of the environment in which the heat pump unit is located is greater than a preset ambient temperature threshold, and the detected temperature of the refrigerant in the target heat exchanger of the heat pump unit is less than a preset refrigerant temperature threshold, the target heat exchanger being a heat exchanger in the heat pump unit that exchanges heat with the environment in which it is located; if the duration is less than the preset duration threshold, it is determined that the heat pump unit is in a steady-state heating condition.

[0285] Optionally, the second operating parameter includes a second detected temperature of the liquid medium that exchanges heat with the heat pump unit at a second target moment, and the second target moment is the moment when the liquid medium and the refrigerant in the heat pump unit stop flowing; when the processor 901 determines the load state of the heat pump unit based on the second operating parameter of the heat pump unit before the compressor is started, it specifically executes: if the difference between the detected temperature of the liquid medium at the current moment and the second detected temperature is greater than a preset second threshold value, it is determined that the load state of the heat pump unit is the target load state; if the difference between the detected temperature of the liquid medium at the current moment and the second detected temperature is less than or equal to the preset second threshold value, it is determined that the load state of the heat pump unit is not the target load state.

[0286] Optionally, the processor 901 may further execute: if the liquid pump driving the liquid medium to flow is in a stopped state, and the compressor is in a stopped state, determining that the liquid medium and the refrigerant in the heat pump unit stop flowing.

[0287] Optionally, the second operating parameter includes a third detected temperature of the liquid medium for exchanging heat with the heat pump unit at a third target time and a fourth detected temperature at a fourth target time, the third target time being the time when the heat pump unit enters the defrost condition, and the fourth target time being the time when the heat pump unit exits the defrost condition; when the processor 901 determines the load state of the heat pump unit based on the second operating parameter of the heat pump unit before the compressor is started, it specifically executes: if the fourth detected temperature is greater than the third detected temperature, it is determined that the load state of the heat pump unit is the target load state; if the fourth detected temperature is less than or equal to the third detected temperature, it is determined that the load state of the heat pump unit is not the target load state.

[0288] Optionally, the processor 901 may further execute: obtaining the detected temperature change rate of the liquid medium; if the detected temperature change rate of the liquid medium is greater than a preset detected temperature change rate threshold, determining that the heat pump unit enters the defrosting condition.

[0289] Optionally, the processor 901 may also execute: obtaining the exhaust temperature change rate of the compressor; if the exhaust temperature change rate of the compressor is greater than a preset exhaust temperature change rate threshold, determining that the heat pump unit enters the defrosting condition.

[0290] Optionally, when the processor 901 determines the set of upper limits of parameter changes corresponding to each first control stage based on the first operating parameters of each first control stage within the target time range of the heat pump unit, it specifically executes: determining the set of upper limits of parameter changes corresponding to each first control stage based on the first operating parameters of each first control stage and the mapping relationship between the first operating parameters and the set of upper limits of parameter changes; the first operating parameters include a first maximum value parameter and the exhaust temperature of the compressor in the corresponding first control stage, and the first maximum value parameter is the maximum value between the detected temperature of the liquid medium for heat exchange with the heat pump unit in the corresponding first control stage and the saturated condensation temperature of the liquid medium at the exhaust pressure of the compressor in the corresponding first control stage.

[0291] Optionally, after the processor 901 determines the set of upper limits of parameter changes corresponding to each first control stage based on the first operating parameters of the heat pump unit within the target time range, it specifically performs: based on the upper limit of duration change in the set of upper limits of parameter change corresponding to each first control stage, configures the duration of each first control stage stage by stage.

[0292] Optionally, when the processor 901 configures the duration of each first control stage stage by stage based on the upper limit of the duration change in the set of upper limits of the parameter change corresponding to each first control stage, the processor 901 specifically performs the following: for any target first control stage among multiple first control stages, if the target first control stage is the first first control stage among multiple first control stages, then the duration change corresponding to the target first control stage is determined below the upper limit of the duration change corresponding to the target first control stage, and the sum of the duration change corresponding to the target first control stage and the initial duration is configured as the duration of the target first control stage; if the target first control stage is not the first first control stage among multiple first control stages, then the duration change corresponding to the target first control stage is determined below the upper limit of the duration change corresponding to the target first control stage, and the sum of the duration change corresponding to the target first control stage and the duration corresponding to the previous first control stage of the target first control stage is configured as the duration of the target first control stage.

[0293] Optionally, when the processor 901 configures the frequency of the compressor in each first control stage stage by stage based on the upper limit of the frequency change in the upper limit set of parameter change corresponding to each first control stage, the processor 901 specifically performs the following: for any target first control stage among multiple first control stages, if the target first control stage is the first first control stage among multiple first control stages, then the frequency change corresponding to the target first control stage is determined below the upper limit of the frequency change corresponding to the target first control stage, and the sum of the frequency change corresponding to the target first control stage and the initial frequency is configured as the frequency of the compressor in the target first control stage; if the target first control stage is not the first first control stage among multiple first control stages, then the frequency change corresponding to the target first control stage is determined below the upper limit of the frequency change corresponding to the target first control stage, and the sum of the frequency change corresponding to the target first control stage and the frequency corresponding to the previous first control stage of the target first control stage is configured as the frequency of the compressor in the target first control stage.

[0294] Optionally, when the processor 901 configures the opening of the throttling element in each first control stage step by step based on the upper limit of the opening change in the set of upper limits of the parameter change corresponding to each first control stage, the processor 901 specifically performs the following: for any target first control stage among multiple first control stages, if the target first control stage is the first first control stage among multiple first control stages, then the opening change corresponding to the target first control stage is determined below the upper limit of the opening change corresponding to the target first control stage, and the sum of the opening change corresponding to the target first control stage and the initial opening is configured as the opening of the throttling element in the target first control stage; if the target first control stage is not the first first control stage among multiple first control stages, then the opening change corresponding to the target first control stage is determined below the upper limit of the opening change corresponding to the target first control stage, and the sum of the opening change corresponding to the target first control stage and the opening corresponding to the previous first control stage of the target first control stage is configured as the opening of the throttling element in the target first control stage.

[0295] Optionally, after executing the upper limit of the opening variation in the parameter variation upper limit set corresponding to each first control stage, and configuring the opening of the throttling element in each first control stage stage by stage, the processor 901 specifically performs: determining the parameter variation set corresponding to each second control stage based on the third operating parameter of the heat pump unit after the target time range; configuring the frequency of the compressor in each second control stage stage by stage based on the frequency variation in the parameter variation set corresponding to each second control stage; configuring the opening of the throttling element in each second control stage stage by stage based on the opening variation in the parameter variation set corresponding to each second control stage.

[0296] Optionally, when the processor 901 determines the parameter change set corresponding to each second control stage based on the third operating parameter of each second control stage after the target time range of the heat pump unit, it specifically executes: based on the third operating parameter of each second control stage, and the mapping relationship between the third operating parameter and the parameter change set, determine the parameter change set corresponding to each second control stage; the third operating parameter includes a second maximum value parameter and a first minimum value parameter, the second maximum value parameter is the maximum value between the exhaust temperature change rate and the exhaust pressure change rate of the compressor in the corresponding second control stage, the first minimum value parameter is the minimum value between the exhaust temperature margin and the exhaust pressure margin of the compressor in the corresponding second control stage, the exhaust temperature margin is the difference between the exhaust temperature of the compressor in the corresponding second control stage and the preset exhaust temperature protection value, and the exhaust pressure margin is the difference between the exhaust pressure of the compressor in the corresponding second control stage and the preset exhaust pressure protection value.

[0297] The effects that can be achieved by this embodiment can be found in the relevant embodiments of the control method of the heat pump unit mentioned above, which will not be described in detail here.

[0298] An embodiment of the present application further provides a heat pump unit, which includes a compressor and a throttling element; the heat pump unit is configured to execute any one of the control methods for the heat pump unit provided in the above embodiments.

[0299] In some possible implementations, the heat pump unit may be used Figure 3 The structure of the heat pump unit 1 is shown. Figure 3 As shown, the heat pump unit 1 includes a compressor 10, a first heat exchanger 20, a throttling element 30, a second heat exchanger 40, a liquid pump 70, a first temperature sensor 11, a second temperature sensor 21, a third temperature sensor 22, a first pressure sensor 12, a fourth temperature sensor 41, and a fifth temperature sensor 60. The specific connection relationship and functions are as follows:

[0300] The compressor 10 has a second port connected to the first port of the first heat exchanger 20 through a pipeline, and is used to compress the low-temperature and low-pressure refrigerant into a high-temperature and high-pressure refrigerant.

[0301] The first heat exchanger 20 (eg, a condenser): the second port of the first heat exchanger 20 is connected to the first port of the throttling element 30 through a pipeline, and is used to transfer the heat of the high-temperature and high-pressure refrigerant to the liquid medium to achieve heating of the liquid medium.

[0302] The throttling element 30 (eg, an electronic expansion valve) is disposed between the first heat exchanger 20 and the second heat exchanger 40 and is used to throttle and reduce the pressure of the cooled high-pressure refrigerant to form a low-temperature and low-pressure refrigerant.

[0303] The second heat exchanger 40 (eg, evaporator): a first port thereof is connected to the second port of the throttling element 30 through a pipeline, and a second port thereof is connected to the first port of the compressor 10, for absorbing ambient heat and transferring the ambient heat to the low-temperature and low-pressure refrigerant.

[0304] Liquid pump 70: arranged in the water outlet pipeline of the heat pump unit 1, used to drive the liquid medium (such as water) to flow through the first heat exchanger 20 to ensure continuous heat exchange between the liquid medium and the refrigerant;

[0305] The first temperature sensor 11 is disposed at the exhaust port of the compressor 10 to monitor the exhaust temperature of the compressor in real time.

[0306] The second temperature sensor 21 is disposed in the water outlet pipeline of the first heat exchanger 20 to detect the outlet water temperature of the heat pump unit 1 .

[0307] The third temperature sensor 22 is disposed in the water inlet pipeline of the first heat exchanger 20 to detect the inlet water temperature of the heat pump unit 1 .

[0308] The first pressure sensor 12 is disposed at the exhaust port of the compressor 10 to monitor the exhaust pressure of the compressor 10 .

[0309] The fourth temperature sensor 41 is disposed in the refrigerant pipeline of the second heat exchanger 40 to detect the refrigerant temperature at the outlet of the second heat exchanger 40 .

[0310] The fifth temperature sensor 60 is disposed on or near the fin surface of the second heat exchanger 40 and is used to detect the ambient temperature of the environment in which the heat pump unit 1 is located.

[0311] In some possible implementations, the liquid medium can be used by the water system 50. The heat pump unit 1 and the water system 50 of this embodiment are both components of a certain device. For example, the heat pump unit 1 and the water system 50 are both components of a heat pump water heater.

[0312] Based on the above structure, the heat pump unit of this embodiment can realize the compression, condensation, throttling and evaporation cycle of the refrigerant, and can adjust the compressor frequency, throttling element opening and liquid pump operating status in real time through the data collected by relevant sensor components to ensure heating efficiency and avoid system overload.

[0313] An embodiment of the present application also provides a computer-readable storage medium, in which a computer program is stored. When the computer program is executed, the computer executes the above-mentioned related method steps to implement any one of the control methods for the heat pump unit provided in the above embodiments.

[0314] Among them, the control and computer-readable storage medium of the heat pump unit provided in this embodiment are used to execute the corresponding methods provided above. Therefore, the beneficial effects that can be achieved can refer to the beneficial effects in the corresponding methods provided above, and will not be repeated here.

[0315] The above contents are only specific implementation methods of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A control method for a heat pump unit, characterized in that: The heat pump unit comprises a compressor and a throttling element; the method comprises: determining a target time range after startup of the compressor; Based on the first operating parameters of the heat pump unit in each first control stage within the target time range, determining a set of upper limits of parameter changes corresponding to each first control stage; Based on the upper limit of frequency variation in the parameter variation upper limit set corresponding to each of the first control stages, configuring the frequency of the compressor in each of the first control stages stage by stage; Based on the upper limit of the opening variation in the parameter variation upper limit set corresponding to each of the first control stages, configuring the opening of the throttling element in each of the first control stages stage by stage; The first operating parameter includes a first maximum value parameter and the exhaust temperature of the compressor in the corresponding first control stage. The first maximum value parameter is the maximum value between the detected temperature of the liquid medium for heat exchange with the heat pump unit in the corresponding first control stage and the saturated condensation temperature of the liquid medium at the exhaust pressure of the compressor in the corresponding first control stage.

2. The method according to claim 1, characterized in that The step of determining the target time range after the compressor is started includes: determining a load state of the heat pump unit based on a second operating parameter of the heat pump unit before the compressor is started; The determining of the target time range after the compressor is started includes: When the load state of the heat pump unit is the target load state, a target time range after the compressor is started is determined.

3. The method according to claim 2, characterized in that The second operating parameter includes a first exhaust temperature of the compressor at a corresponding time of the last shutdown, and a second exhaust temperature of the compressor at a current time; the load state of the heat pump unit is determined based on the second operating parameter of the heat pump unit before the compressor is started, including: Determine the interval time from the time when the compressor last stopped to the current time; Determine a third exhaust temperature after the first exhaust temperature decays over the interval time; If the second exhaust temperature is greater than the third exhaust temperature, determining that the load state of the heat pump unit is a target load state; If the second exhaust temperature is less than or equal to the third exhaust temperature, it is determined that the load state of the heat pump unit is not the target load state.

4. The method according to claim 2, characterized in that The second operating parameter includes a first detected temperature of a liquid medium exchanging heat with the heat pump unit at a first target time, and the first target time is the time when the heat pump unit is in a steady-state heating condition; the determining the load state of the heat pump unit based on the second operating parameter of the heat pump unit before the compressor is started includes: If the difference between the detected temperature of the liquid medium at the current moment and the first detected temperature is greater than a preset first threshold, determining that the load state of the heat pump unit is a target load state; If the difference between the detected temperature of the liquid medium at the current moment and the first detected temperature is less than or equal to a preset first threshold, it is determined that the load state of the heat pump unit is not the target load state.

5. The method according to claim 4, characterized in that The method further comprises: Obtaining a duration during which the ambient temperature of the environment in which the heat pump unit is located is greater than a preset ambient temperature threshold, and the detected temperature of the refrigerant in the target heat exchanger of the heat pump unit is less than a preset refrigerant temperature threshold, wherein the target heat exchanger is a heat exchanger in the heat pump unit that exchanges heat with the environment in which the heat pump unit is located; If the duration is less than a preset duration threshold, it is determined that the heat pump unit is in a steady-state heating condition.

6. The method according to claim 2, characterized in that The second operating parameter includes a second detected temperature of a liquid medium exchanging heat with the heat pump unit at a second target time, and the second target time is the time when the liquid medium and the refrigerant in the heat pump unit stop flowing; the determining the load state of the heat pump unit based on the second operating parameter of the heat pump unit before the compressor is started includes: If the difference between the detected temperature of the liquid medium at the current moment and the second detected temperature is greater than a preset second threshold, determining that the load state of the heat pump unit is a target load state; If the difference between the detected temperature of the liquid medium at the current moment and the second detected temperature is less than or equal to a preset second threshold, it is determined that the load state of the heat pump unit is not the target load state.

7. The method according to claim 6, characterized in that The method further comprises: If the liquid pump driving the liquid medium to flow is in a stopped state, and the compressor is in a stopped state, it is determined that the liquid medium and the refrigerant in the heat pump unit stop flowing.

8. The method according to claim 2, characterized in that: The second operating parameter includes a third detected temperature of a liquid medium exchanging heat with the heat pump unit at a third target time and a fourth detected temperature at a fourth target time, the third target time being the time when the heat pump unit enters a defrosting condition, and the fourth target time being the time when the heat pump unit exits a defrosting condition; the determining the load state of the heat pump unit based on the second operating parameter of the heat pump unit before the compressor is started includes: If the fourth detected temperature is greater than the third detected temperature, determining that the load state of the heat pump unit is a target load state; If the fourth detected temperature is less than or equal to the third detected temperature, it is determined that the load state of the heat pump unit is not the target load state.

9. The method according to claim 8, characterized in that The method further comprises: Obtaining a detected temperature change rate of the liquid medium; If the detected temperature change rate of the liquid medium is greater than a preset detected temperature change rate threshold, it is determined that the heat pump unit enters the defrosting condition.

10. The method according to claim 8, characterized in that The method further comprises: Obtaining the exhaust temperature change rate of the compressor; If the exhaust temperature change rate of the compressor is greater than a preset exhaust temperature change rate threshold, it is determined that the heat pump unit enters the defrosting condition.

11. The method according to claim 1, characterized in that: The determining, based on the first operating parameters of each first control stage of the heat pump unit within the target time range, a set of upper limits of parameter changes corresponding to each first control stage includes: Based on the first operating parameters of each of the first control stages and the mapping relationship between the first operating parameters and the parameter change upper limit set, the parameter change upper limit set corresponding to each of the first control stages is determined.

12. The method according to claim 1, characterized in that After determining a set of upper limits of parameter changes corresponding to each first control stage based on the first operating parameters of the heat pump unit in each first control stage within the target time range, the method further includes: The duration of each of the first control stages is configured stage by stage based on the upper limit of the duration variation in the parameter variation upper limit set corresponding to each of the first control stages.

13. The method according to claim 12, characterized in that The configuring the duration of each of the first control stages stage by stage based on the duration variation upper limit in the parameter variation upper limit set corresponding to each of the first control stages includes: For any one target first control stage among the plurality of first control stages, if the target first control stage is the first first control stage among the plurality of first control stages, a duration change amount corresponding to the target first control stage is determined below an upper limit of a duration change amount corresponding to the target first control stage, and a sum of the duration change amount corresponding to the target first control stage and an initial duration is configured as the duration of the target first control stage; If the target first control stage is not the first first control stage among multiple first control stages, the duration change corresponding to the target first control stage is determined below the upper limit of the duration change corresponding to the target first control stage, and the sum of the duration change corresponding to the target first control stage and the duration corresponding to the previous first control stage of the target first control stage is configured as the duration of the target first control stage.

14. The method according to claim 1, characterized in that The configuring the frequency of the compressor in each of the first control stages stage by stage based on the frequency variation upper limit in the parameter variation upper limit set corresponding to each of the first control stages includes: For any one target first control stage among the plurality of first control stages, if the target first control stage is the first first control stage among the plurality of first control stages, a frequency change amount corresponding to the target first control stage is determined below an upper limit of a frequency change amount corresponding to the target first control stage, and a sum of the frequency change amount corresponding to the target first control stage and an initial frequency is configured as the frequency of the compressor in the target first control stage; If the target first control stage is not the first first control stage among multiple first control stages, the frequency change amount corresponding to the target first control stage is determined below the upper limit of the frequency change amount corresponding to the target first control stage, and the sum of the frequency change amount corresponding to the target first control stage and the frequency corresponding to the previous first control stage of the target first control stage is configured as the frequency of the compressor in the target first control stage.

15. The method according to claim 1, characterized in that The configuring the opening of the throttling element in each of the first control stages stage by stage based on the upper limit of the opening variation in the parameter variation upper limit set corresponding to each of the first control stages comprises: For any one target first control stage among the plurality of first control stages, if the target first control stage is the first first control stage among the plurality of first control stages, the opening change amount corresponding to the target first control stage is determined below the opening change amount upper limit corresponding to the target first control stage, and the sum of the opening change amount corresponding to the target first control stage and the initial opening is configured as the opening of the throttling element in the target first control stage; If the target first control stage is not the first first control stage among multiple first control stages, the opening change corresponding to the target first control stage is determined below the upper limit of the opening change corresponding to the target first control stage, and the sum of the opening change corresponding to the target first control stage and the opening corresponding to the previous first control stage of the target first control stage is configured as the opening of the throttling element in the target first control stage.

16. The method according to claim 1, characterized in that After configuring the opening of the throttling element in each of the first control stages in stages based on the upper limit of the opening variation in the parameter variation upper limit set corresponding to each of the first control stages, the method further includes: Based on the third operating parameters of the heat pump unit in each second control stage after the target time range, determining a set of parameter changes corresponding to each second control stage; Based on the frequency variation in the parameter variation set corresponding to each of the second control stages, configuring the frequency of the compressor in each of the second control stages stage by stage; The opening of the throttling element in each of the second control stages is configured stage by stage based on the opening variation in the parameter variation set corresponding to each of the second control stages.

17. The method according to claim 16, characterized in that The determining, based on the third operating parameter of each second control stage of the heat pump unit after the target time range, a set of parameter changes corresponding to each second control stage includes: Determine the parameter change amount set corresponding to each of the second control stages based on the third operating parameters of each of the second control stages and the mapping relationship between the third operating parameters and the parameter change amount set; The third operating parameter includes a second maximum parameter and a first minimum parameter, the second maximum parameter is the maximum value between the exhaust temperature change rate and the exhaust pressure change rate of the compressor in the corresponding second control stage, the first minimum parameter is the minimum value between the exhaust temperature margin and the exhaust pressure margin of the compressor in the corresponding second control stage, the exhaust temperature margin is the difference between the exhaust temperature of the compressor in the corresponding second control stage and the preset exhaust temperature protection value, and the exhaust pressure margin is the difference between the exhaust pressure of the compressor in the corresponding second control stage and the preset exhaust pressure protection value.

18. A control device for a heat pump unit, characterized in that: The heat pump unit comprises a compressor and a throttling element; the device comprises: a first determining unit, configured to determine a target time range after the compressor is started; A second determining unit, configured to determine a set of upper limits of parameter changes corresponding to each of the first control stages based on the first operating parameters of the heat pump unit in each of the first control stages within the target time range; A first configuration unit, configured to configure the frequency of the compressor in each of the first control stages stage by stage based on the frequency variation upper limit in the parameter variation upper limit set corresponding to each of the first control stages; a second configuration unit, configured to configure the opening of the throttling element in each of the first control stages stage by stage based on the upper limit of the opening variation in the parameter variation upper limit set corresponding to each of the first control stages; The first operating parameter includes a first maximum value parameter and the exhaust temperature of the compressor in the corresponding first control stage. The first maximum value parameter is the maximum value between the detected temperature of the liquid medium for heat exchange with the heat pump unit in the corresponding first control stage and the saturated condensation temperature of the liquid medium at the exhaust pressure of the compressor in the corresponding first control stage.

19. A heat pump unit, characterized in that: The heat pump unit comprises a compressor and a throttling element; the heat pump unit is configured to perform the method according to any one of claims 1 to 17.

20. An electronic device, characterized in that: The electronic device comprises: A memory for storing executable program codes; A processor, configured to call and run the executable program code from the memory, so that the electronic device executes the method as claimed in any one of claims 1 to 17.

21. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed, the method according to any one of claims 1 to 17 is implemented.

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