Control method and device of air source heat pump, medium and air source heat pump

Abstract

The invention relates to the technical field of control of air source heat pumps, particularly provides a control method and device of an air source heat pump, a medium and the air source heat pump, and aims to solve the technical problem of how to reduce the real-time evaporation temperature of a compressor of the air source heat pump more efficiently. In order to achieve the purpose, the control method of the air source heat pump comprises the steps that the real-time evaporation temperature of a compressor of the air source heat pump is obtained, and the difference value between the real-time evaporation temperature and the preset highest evaporation temperature is obtained based on the real-time evaporation temperature; and according to the difference value, the opening degree of an electronic expansion valve of the air source heat pump and / or the gear of a draught fan are / is controlled. By means of the configuration mode, the real-time evaporation temperature of the compressor of the air source heat pump can be reduced more efficiently.

Description

Technical Field

[0001] The present invention relates to the technical field of air source heat pump control, and specifically provides a control method, device, medium and air source heat pump for an air source heat pump. Background Art

[0002] Air source heat pump heating mainly relies on the evaporator to absorb heat from the air; the higher the air temperature, the higher the evaporation temperature of the evaporator, that is, the higher the evaporation temperature of the compressor. However, the compressor has a maximum limit on the evaporation temperature. If the evaporation temperature of the compressor exceeds the limit, it may cause poor heat dissipation of the motor and cause damage to the compressor.

[0003] The existing technology uses the control of the fan speed to reduce the evaporation temperature of the compressor, but the control effect is poor, the evaporation temperature response is slow, and the control process may exceed the evaporation temperature limit. In addition, it is very likely that after the fan reaches the minimum speed, the evaporation temperature of the compressor still exceeds the limit. At this time, the fan can only be stopped to reduce the evaporation temperature. After the fan is stopped, the state of the unit fluctuates greatly, and the reliability of the air source heat pump and the service life of the compressor will be affected.

[0004] Using only fan control can only ensure that the maximum heating environment temperature (air temperature) can reach 50°C, but cannot reach 55°C.

[0005] Accordingly, the art needs a new control scheme for air source heat pumps to solve the above problems. Summary of the invention

[0006] In order to overcome the above-mentioned defects, the present invention is proposed to provide a solution or at least partially solve the technical problem of how to more efficiently reduce the real-time evaporation temperature of the compressor of the air source heat pump.

[0007] In a first aspect, the present invention provides a control method for an air source heat pump, the method comprising:

[0008] Acquire a real-time evaporation temperature of a compressor of the air source heat pump, and acquire a difference between the real-time evaporation temperature and a preset maximum evaporation temperature based on the real-time evaporation temperature;

[0009] According to the difference, the opening degree of the electronic expansion valve and / or the gear position of the fan of the air source heat pump is controlled.

[0010] In a technical solution of the control method of the air source heat pump, the opening of the electronic expansion valve and / or the gear position of the fan of the air source heat pump is controlled according to the difference, including:

[0011] When the difference is greater than a first preset temperature, controlling the gear position of the fan; and / or,

[0012] When the difference is greater than a seventh preset temperature, the opening of the electronic expansion valve is controlled.

[0013] In a technical solution of the above-mentioned control method of the air source heat pump, the control of the gear position of the fan includes:

[0014] At intervals of a first preset time length, obtaining the difference;

[0015] When the difference is greater than the first preset temperature and less than or equal to the second preset temperature, controlling the fan to reduce a first preset gear;

[0016] When the difference is greater than the second preset temperature, the fan is controlled to reduce a second preset gear; wherein the second preset gear is greater than the first preset gear;

[0017] When the difference is greater than a third preset temperature and less than or equal to the first preset temperature, controlling the fan to maintain the current gear position;

[0018] When the difference is less than or equal to the third preset temperature, exiting the control of the gear position of the fan;

[0019] When the difference is greater than the first preset temperature and the fan gear is at the minimum, the compressor frequency of the air source heat pump is controlled.

[0020] In a technical solution of the above-mentioned control method of the air source heat pump, the control of the compressor frequency of the air source heat pump includes:

[0021] Obtaining the number of adjustment steps based on the difference;

[0022] At intervals of a second preset time length, obtaining the difference;

[0023] When the difference is greater than a fourth preset temperature, increasing the compressor frequency according to the adjustment step number;

[0024] When the difference is less than or equal to the fourth preset temperature, maintaining the compressor frequency;

[0025] When the difference is greater than the fourth preset temperature and the compressor frequency reaches the maximum, sending a temperature warning message;

[0026] The fourth preset temperature is lower than the first preset temperature and higher than the third preset temperature.

[0027] In a technical solution of the control method of the air source heat pump, obtaining the number of adjustment steps based on the difference includes obtaining the number of adjustment steps according to the following formula:

[0028] df=-1(Pst-Pstmax)×j

[0029] Wherein, df is the adjustment step number, Pst is the real-time evaporation temperature, Pstmax is the preset maximum evaporation temperature, j is a constant and -j is less than the fourth preset temperature.

[0030] In a technical solution of the above-mentioned control method of the air source heat pump, the controlling of the opening of the electronic expansion valve includes:

[0031] Acquiring the current ambient temperature, and acquiring the target value of the suction superheat of the electronic expansion valve based on the current ambient temperature;

[0032] Acquire a correction value based on the real-time evaporation temperature, and acquire a corrected suction superheat target value of the electronic expansion valve according to the correction value and the suction superheat target value;

[0033] Obtaining a regulation step according to the corrected suction air superheat target value and the actual suction air superheat;

[0034] Obtaining the difference at intervals of a third preset time length;

[0035] When the difference is greater than a seventh preset temperature, increasing the opening of the electronic expansion valve according to the adjustment step;

[0036] When the difference is greater than a seventh preset temperature and the opening of the electronic expansion valve reaches a maximum, a temperature warning message is sent.

[0037] In a technical solution of the above-mentioned control method of the air source heat pump, the obtaining of the correction value based on the real-time evaporation temperature includes:

[0038] When the real-time evaporation temperature is greater than the fifth preset temperature, the correction value is assigned to a third preset value; when the real-time evaporation temperature is less than or equal to the fifth preset temperature and greater than the sixth preset temperature, the correction value is assigned to a fourth preset value; when the real-time evaporation temperature is less than or equal to the sixth preset temperature and greater than the seventh preset temperature, the correction value is assigned to a fifth preset value, wherein the third preset value is greater than the fourth preset value and greater than the fifth preset value; and / or,

[0039] The step of obtaining the corrected target suction superheat value of the electronic expansion valve according to the correction value and the target suction superheat value comprises obtaining the corrected target suction superheat value according to the following formula:

[0040] SH=SH1+SH2

[0041] Wherein, SH is the corrected suction superheat target value, SH2 is the corrected value, SH1 is the suction superheat target value; and / or,

[0042] The obtaining of the adjustment step according to the modified suction superheat target value and the actual suction superheat comprises obtaining the adjustment step according to the following formula:

[0043] dp=g×(SH'-SH)+h

[0044] Wherein, dp is the adjustment step, SH' is the actual suction superheat, and g and h are both constants.

[0045] In a second aspect, a control device is provided, which includes at least one processor and at least one storage device, wherein the storage device is suitable for storing multiple program codes, and the program codes are suitable for being loaded and run by the processor to execute the air source heat pump control method described in any one of the technical solutions of the above-mentioned air source heat pump control method.

[0046] In a third aspect, a computer-readable storage medium is provided, which stores a plurality of program codes, wherein the program codes are suitable for being loaded and run by a processor to execute the air source heat pump control method described in any one of the technical solutions of the above-mentioned air source heat pump control method.

[0047] In a fourth aspect, an air source heat pump is provided, wherein the air source heat pump comprises the control device described in the above-mentioned control device technical solution.

[0048] The above one or more technical solutions of the present invention have at least one or more of the following Beneficial effects:

[0049] In the technical solution for implementing the present invention, the present invention first obtains the real-time evaporation temperature of the compressor of the air source heat pump, and obtains the difference between the real-time evaporation temperature and the preset maximum evaporation temperature based on the real-time evaporation temperature; according to the difference, the opening of the electronic expansion valve of the air source heat pump and / or the gear of the fan are controlled. Through the above configuration, the present invention improves the response speed of reducing the real-time evaporation temperature by controlling the opening of the electronic expansion valve of the air source heat pump and the gear of the fan, and controls the opening of the electronic expansion valve of the air source heat pump and the gear of the fan differently according to the different intervals in which the difference is located. Under the premise of ensuring the performance of the air source heat pump, the air source heat pump can operate more stably, and the real-time evaporation temperature of the compressor of the air source heat pump can be reduced more efficiently, so that the compressor of the air source heat pump can operate normally under a higher heating environment temperature (above 55°C). BRIEF DESCRIPTION OF THE DRAWINGS

[0050] The disclosure of the present invention will become more easily understood with reference to the accompanying drawings. It is easy for those skilled in the art to understand that these drawings are only for illustrative purposes and are not intended to limit the scope of protection of the present invention. Among them:

[0051] Figure 1 is a flow chart of main steps of a method for controlling an air source heat pump according to an embodiment of the present invention;

[0052] Figure 2 It is a flowchart diagram of main steps of a method for controlling an air source heat pump according to an implementation of an embodiment of the present invention. DETAILED DESCRIPTION

[0053] Some embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0054] In the description of the present invention, "module" and "processor" may include hardware, software or a combination of the two. A module may include hardware circuits, various suitable sensors, communication ports, and memories, and may also include software parts, such as program codes, or a combination of software and hardware. The processor may be a central processing unit, a microprocessor, an image processor, a digital signal processor, or any other suitable processor. The processor has data and / or signal processing functions. The processor may be implemented in software, hardware, or a combination of the two. Non-temporary computer-readable storage media include any suitable medium that can store program codes, such as a magnetic disk, a hard disk, an optical disk, a flash memory, a read-only memory, a random access memory, and the like. The term "A and / or B" means all possible combinations of A and B, such as only A, only B, or A and B. The term "at least one A or B" or "at least one of A and B" has a similar meaning to "A and / or B", and may include only A, only B, or A and B. The singular terms "one" and "the" may also include plural forms.

[0055] See attached Figure 1 , Figure 1 FIG. 1 is a flow chart showing the main steps of a method for controlling an air source heat pump according to an embodiment of the present invention. Figure 1 As shown, the control method of the air source heat pump in the embodiment of the present invention mainly includes the following steps S101-S102.

[0056] Step S101: obtaining the real-time evaporation temperature of the compressor of the air source heat pump, and obtaining the difference between the real-time evaporation temperature and the preset maximum evaporation temperature based on the real-time evaporation temperature.

[0057] In this embodiment, the real-time evaporation temperature of the compressor of the air source heat pump is obtained, and the difference between the real-time evaporation temperature and the preset maximum evaporation temperature is obtained according to the real-time evaporation temperature. Those skilled in the art can customize the maximum evaporation temperature according to actual conditions.

[0058] In one embodiment, the air source heat pump may be a single-stage compressed air source heat pump or a cascade air source heat pump.

[0059] Step S102: Control the opening of the electronic expansion valve and / or the gear position of the fan of the air source heat pump according to the difference.

[0060] In this embodiment, the opening of the electronic expansion valve of the air source heat pump and the gear position of the fan can be controlled according to the difference, so as to reduce the real-time evaporation temperature of the air source heat pump.

[0061] In one implementation, step S102 may include the following steps S1021:

[0062] Step S1021: When the difference is greater than the first preset temperature, the gear position of the fan is controlled.

[0063] In this embodiment, when the difference is greater than the first preset temperature, the gear of the fan can be controlled to reduce the real-time evaporation temperature by controlling the gear of the fan. Those skilled in the art can customize the first preset temperature and the seventh preset temperature according to actual conditions.

[0064] In one implementation, step S102 may include the following steps S1022:

[0065] Step S1022: When the difference is greater than the seventh preset temperature, the opening of the electronic expansion valve is controlled.

[0066] In this embodiment, when the difference is greater than the seventh preset temperature, the opening of the electronic expansion valve may be controlled to reduce the real-time evaporation temperature by controlling the opening of the electronic expansion valve.

[0067] In one embodiment, the first preset temperature may be lower than the seventh preset temperature. When the difference is greater than the first preset temperature and less than or equal to the seventh preset temperature, only the gear position of the fan may be controlled. When the difference is greater than the seventh preset temperature, the opening of the electronic expansion valve may be controlled.

[0068] This solution uses the opening of the electronic expansion valve to control the fan as a supplement to the gear control to reduce the real-time evaporation temperature of the compressor, which can more effectively control the real-time evaporation temperature of the compressor of the air source heat pump.

[0069] In one embodiment, the first preset temperature may be greater than the seventh preset temperature. When the difference is greater than the seventh preset temperature and less than or equal to the first preset temperature, only the opening of the electronic expansion valve may be controlled. When the difference is greater than the first preset temperature, the gear position of the fan may be controlled.

[0070] In one implementation, when the first preset temperature is equal to the seventh preset temperature, when the difference is greater than the seventh preset temperature, the opening of the electronic expansion valve and the gear position of the fan can be controlled simultaneously.

[0071] In one implementation, step S1021 may include the following steps S10211 to S10216:

[0072] Step S10211: Obtain a difference value at every first preset time interval.

[0073] Step S10212: When the difference is greater than the first preset temperature and less than or equal to the second preset temperature, control the fan to reduce the first preset gear.

[0074] Step S10213: When the difference is greater than the second preset temperature, control the fan to reduce the second preset gear; wherein the second preset gear is greater than the first preset gear.

[0075] Step S10214: When the difference is greater than the third preset temperature and less than or equal to the first preset temperature, the fan is controlled to maintain the current gear position.

[0076] Step S10215: When the difference is less than or equal to the third preset temperature, exit the control of the gear position of the fan.

[0077] Step S10216: When the difference is greater than the first preset temperature and the fan gear is at the minimum, the compressor frequency of the air source heat pump is controlled.

[0078] In this embodiment, the difference is obtained at intervals of a first preset time length. When the difference is greater than the first preset temperature and less than or equal to the second preset temperature, the real-time evaporation temperature is high, and it is necessary to control the fan to lower the first preset gear to lower the real-time evaporation temperature. When the difference is greater than the second preset temperature, the real-time evaporation temperature is the highest, and it is necessary to control the fan to lower the second preset gear to lower the real-time evaporation temperature. Among them, the second preset gear is greater than the first preset gear. When the difference is greater than the third preset temperature and less than or equal to the first preset temperature, the real-time evaporation temperature is low, and the real-time evaporation temperature can be lowered by controlling the fan to maintain the current gear. When the difference is less than or equal to the third preset temperature, the control of the fan gear is exited. When the difference is greater than the first preset temperature and the fan gear is at the smallest, the fan cannot be downshifted, and the compressor frequency of the air source heat pump needs to be controlled to lower the real-time evaporation temperature. Among them, the first preset temperature, the second preset temperature, and the third preset temperature are all less than zero. On the premise of satisfying the above-mentioned numerical value relationships, technical personnel in this field can customize the first preset time, the second preset temperature, the third preset temperature, the fifth preset temperature, the sixth preset temperature, the first preset gear, and the second preset gear according to actual conditions.

[0079] The compressor frequency of the air source heat pump is controlled as a supplement to the gear control of the fan and the opening control of the electronic expansion valve to reduce the real-time evaporation temperature of the compressor. The multiple control real-time evaporation temperature response is fast, which can increase the maximum heating environment temperature of the compressor of the air source heat pump to above 55°C, and can effectively avoid the problem of occasional over-limit of the real-time evaporation temperature upper limit caused by the insufficient control accuracy of the traditional fan. In addition, the fan does not stop running during the operation of the air source heat pump, which can ensure the stable operation of the air source heat pump.

[0080] In one implementation, as shown in Table 1, Table 1 is a reference table of gears and DC fan speeds, gear 0 is the fan stop gear, and gear 1 is the fan minimum gear. Fan1 is the DC fan speed corresponding to gear 1, and the size of Fan1 is determined by the fan performance, wherein Fan n to Fan0 decreases in sequence.

[0081] Table 1 Gear position and DC fan speed reference table

[0082] Gear DC fan speed 0 Fan0 1 Fan1 2 Fan2 … … n Fann

[0083] In one implementation, step S10216 may include the following steps S102161 to S102165:

[0084] Step S102161: Obtain the number of adjustment steps based on the difference.

[0085] Step S102162: Obtain the difference every second preset time period.

[0086] Step S102163: When the difference is greater than the fourth preset temperature, the compressor frequency is increased according to the adjustment step number.

[0087] Step S102164: When the difference is less than or equal to the fourth preset temperature, the compressor frequency is maintained.

[0088] Step S102165: When the difference is greater than a fourth preset temperature and the compressor frequency reaches a maximum, a temperature warning message is sent, wherein the fourth preset temperature is lower than the first preset temperature and higher than the third preset temperature.

[0089] In this embodiment, the adjustment steps of the compressor are obtained based on the difference, and the difference is obtained at intervals of the second preset time. When the difference is greater than the fourth preset temperature, the compressor frequency is increased according to the adjustment steps to reduce the real-time evaporation temperature. When the difference is less than or equal to the fourth preset temperature, the compressor frequency is maintained. When the difference is greater than the fourth preset temperature and the compressor frequency reaches the maximum, the compressor frequency cannot be increased, and a temperature warning message is sent to prompt the user that the real-time evaporation temperature may exceed the preset maximum evaporation temperature. On the premise that the fourth preset temperature is less than the first preset temperature and greater than the third preset temperature, those skilled in the art can customize the second preset time and the fourth preset temperature according to actual conditions.

[0090] In one implementation, step S102161 may further include obtaining the number of adjustment steps according to the following formula (1):

[0091] df=-1 / (Pst-Pstmax)×j (1)

[0092] Wherein, df is the number of adjustment steps, Pst is the real-time evaporation temperature, Pstmax is the preset maximum evaporation temperature, j is a constant and -j is less than the fourth preset temperature.

[0093] In one implementation, step S1022 may include the following steps S10221 to S10226:

[0094] Step S10221: Obtain the current ambient temperature, and obtain the target value of the suction superheat of the electronic expansion valve based on the current ambient temperature.

[0095] Step S10222: Obtain a correction value based on the real-time evaporation temperature, and obtain a corrected intake air superheat target value of the electronic expansion valve according to the correction value and the intake air superheat target value.

[0096] Step S10223: Obtain the adjustment step according to the corrected intake air superheat target value and the actual intake air superheat.

[0097] Step S10224: Obtain the difference every third preset time period.

[0098] Step S10225: When the difference is greater than the seventh preset temperature, the opening of the electronic expansion valve is increased according to the adjustment step.

[0099] Step S10226: When the difference is greater than the seventh preset temperature and the opening of the electronic expansion valve reaches the maximum, a temperature warning message is sent.

[0100] In this embodiment, the current ambient temperature is obtained, and the target value of the suction superheat of the electronic expansion valve is obtained based on the current ambient temperature. The adjustment step of the electronic expansion valve is obtained according to the modified suction superheat target value and the actual suction superheat. The difference is obtained every third preset time interval. When the difference is greater than the seventh preset temperature, the opening of the electronic expansion valve is increased according to the adjustment step to reduce the real-time evaporation temperature. When the difference is greater than the seventh preset temperature and the opening of the electronic expansion valve reaches the maximum, the opening of the electronic expansion valve cannot be further increased, and a temperature warning message is sent to remind the user that the real-time evaporation temperature may exceed the preset maximum evaporation temperature. Those skilled in the art can customize the third preset time according to actual conditions.

[0101] In one embodiment, as shown in Table 2, Table 2 is a reference table of the current ambient temperature, the target value of suction superheat and the initial opening of the electronic expansion valve, and the target value of suction superheat SH1 can be determined by detecting the current ambient temperature and comparing Table 2. Wherein, Tao is the current ambient temperature, EEV1 to EEVn are all positive integers, and each parameter in Table 2 is an empirical value.

[0102] Table 2 Reference table of current ambient temperature, suction superheat target value and initial opening of electronic expansion valve

[0103]

[0104] In one implementation, step S10222 may further include step S102221:

[0105] Step S102221: When the real-time evaporation temperature is greater than the fifth preset temperature, the correction value is assigned to the third preset value; when the real-time evaporation temperature is less than or equal to the fifth preset temperature and greater than the sixth preset temperature, the correction value is assigned to the fourth preset value; when the real-time evaporation temperature is less than or equal to the sixth preset temperature and greater than the seventh preset temperature, the correction value is assigned to the fifth preset value, wherein the third preset value is greater than the fourth preset value and greater than the fifth preset value.

[0106] In this embodiment, when the real-time evaporation temperature is greater than the fifth preset temperature, the correction value is assigned to the third preset value, when the real-time evaporation temperature is less than or equal to the fifth preset temperature and greater than the sixth preset temperature, the correction value is assigned to the fourth preset value, when the real-time evaporation temperature is less than or equal to the sixth preset temperature and greater than the seventh preset temperature, the correction value is assigned to the fifth preset value, wherein the third preset value is greater than the fourth preset value, greater than the fifth preset value, greater than zero, and zero is greater than the fifth preset temperature, greater than the sixth preset temperature, greater than the seventh preset temperature. Under the premise of satisfying the above-mentioned numerical value relationships, those skilled in the art can customize the fifth preset temperature, the sixth preset temperature, the seventh preset temperature, the third preset value, the fourth preset value, and the fifth preset value according to actual conditions.

[0107] In one embodiment, step S10222 may further include obtaining a modified suction superheat target value according to the following formula (2):

[0108] SH=SH1+SH2 (2)

[0109] Among them, SH is the corrected intake air superheat target value, SH2 is the correction value, and SH1 is the intake air superheat target value.

[0110] In one implementation, step S10223 may further include obtaining the adjustment step according to the following formula (3):

[0111] dp=g×(SH'-SH)+h (3)

[0112] Among them, dp is the adjustment step, SH' is the actual suction superheat, and g and h are constants.

[0113] Based on the above steps S101-S102, the present invention obtains the real-time evaporation temperature of the compressor of the air source heat pump, and obtains the difference between the real-time evaporation temperature and the preset maximum evaporation temperature based on the real-time evaporation temperature; according to the difference, the opening of the electronic expansion valve of the air source heat pump and / or the gear of the fan are controlled. Through the above configuration, the present invention improves the response speed of reducing the real-time evaporation temperature by controlling the opening of the electronic expansion valve of the air source heat pump and the gear of the fan, and controls the opening of the electronic expansion valve of the air source heat pump and the gear of the fan differently according to the different intervals in which the difference is located. Under the premise of ensuring the performance of the air source heat pump, the air source heat pump can operate more stably, and the real-time evaporation temperature of the compressor of the air source heat pump can be reduced more efficiently, so that the compressor of the air source heat pump can operate normally under a higher heating environment temperature (above 55°C).

[0114] In one implementation of the embodiment of the present invention, please refer to the attached Figure 2 , Figure 2FIG. 1 is a flow chart of the main steps of a method for controlling an air source heat pump according to an embodiment of the present invention. Figure 2 As shown, the control method of the air source heat pump may include the following steps S20100 to S20119.

[0115] Step S20100: Turn on the air source heat pump.

[0116] In this embodiment, step S20101 and step S20113 may be executed after the air source heat pump is turned on.

[0117] Step S20101: When the difference between the real-time evaporation temperature and the preset maximum evaporation temperature is greater than the first preset temperature, the gear position of the fan is controlled.

[0118] In this embodiment, the method described in step S20101 is similar to the method described in the aforementioned step S1021, and for the sake of simplicity, it will not be repeated here.

[0119] Step S20102: Obtain a difference value at every first preset time interval.

[0120] In this embodiment, the method described in step S20102 is similar to the method described in the aforementioned step S10211, and for the sake of simplicity, it will not be repeated here.

[0121] Step S20103: When the difference is greater than the first preset temperature and less than or equal to the second preset temperature, the fan is controlled to reduce the first preset gear.

[0122] In this embodiment, the method described in step S20103 is similar to the method described in the aforementioned step S10212, and for the sake of simplicity, it will not be repeated here.

[0123] Step S20104: When the difference is greater than the second preset temperature, the fan is controlled to reduce the second preset gear.

[0124] In this embodiment, the method described in step S20104 is similar to the method described in the aforementioned step S10213, and for the sake of simplicity, it will not be repeated here.

[0125] Step S20105: When the difference is greater than the third preset temperature and less than or equal to the first preset temperature, the fan is controlled to maintain the current gear position.

[0126] In this embodiment, the method described in step S20105 is similar to the method described in the aforementioned step S10214, and for the sake of simplicity, it will not be repeated here.

[0127] Step S20106: When the difference is less than or equal to the third preset temperature, exit the control of the gear position of the fan.

[0128] In this embodiment, the method described in step S20106 is similar to the method described in the aforementioned step S10215, and for the sake of simplicity, it will not be repeated here.

[0129] Step S20107: When the difference is greater than the first preset temperature and the fan gear is at the minimum, the compressor frequency of the air source heat pump is controlled.

[0130] In this embodiment, the method described in step S20107 is similar to the method described in the aforementioned step S10216, and for the sake of simplicity, it will not be repeated here.

[0131] Step S20108: Obtain the number of adjustment steps based on the difference.

[0132] In this embodiment, the method described in step S20108 is similar to the method described in the aforementioned step S102161, and for the sake of simplicity, it will not be repeated here.

[0133] Step S20109: Obtain the difference every second preset time period.

[0134] In this embodiment, the method described in step S20109 is similar to the method described in the aforementioned step S102162, and for the sake of simplicity, it will not be repeated here.

[0135] Step S20110: When the difference is greater than the fourth preset temperature, the compressor frequency is increased according to the adjustment step number.

[0136] In this embodiment, the method described in step S20110 is similar to the method described in the aforementioned step S102163, and for the sake of simplicity, it will not be repeated here.

[0137] Step S20111: When the difference is less than or equal to the fourth preset temperature, the compressor frequency is maintained.

[0138] In this embodiment, the method described in step S20111 is similar to the method described in the aforementioned step S102164, and for the sake of simplicity, it will not be repeated here.

[0139] Step S20112: When the difference is greater than the fourth preset temperature and the compressor frequency reaches the maximum, a temperature warning message is sent.

[0140] In this embodiment, the method described in step S20112 is similar to the method described in the aforementioned step S102165, and for the sake of simplicity, it will not be repeated here.

[0141] Step S20113: When the difference between the real-time evaporation temperature and the preset maximum evaporation temperature is greater than the seventh preset temperature, the opening of the electronic expansion valve is controlled.

[0142] In this embodiment, the method described in step S20113 is similar to the method described in the aforementioned step S1022, and for the sake of simplicity, it will not be repeated here.

[0143] Step S20114: Obtain the current ambient temperature, and obtain the target value of the suction superheat of the electronic expansion valve based on the current ambient temperature.

[0144] In this embodiment, the method described in step S20114 is similar to the method described in the aforementioned step S10221, and for the sake of simplicity, it will not be repeated here.

[0145] Step S20115: Obtain a correction value based on the real-time evaporation temperature, and obtain a corrected intake air superheat target value of the electronic expansion valve according to the correction value and the intake air superheat target value.

[0146] In this embodiment, the method described in step S20115 is similar to the method described in the aforementioned step S10222, and for the sake of simplicity, it will not be repeated here.

[0147] Step S20116: Obtain the adjustment step according to the corrected intake air superheat target value and the actual intake air superheat.

[0148] In this embodiment, the method described in step S20116 is similar to the method described in the aforementioned step S10223, and for the sake of simplicity, it will not be repeated here.

[0149] Step S20117: Obtain the difference every third preset time period.

[0150] In this embodiment, the method described in step S20117 is similar to the method described in the aforementioned step S10224, and for the sake of simplicity, it will not be repeated here.

[0151] Step S20118: When the difference is greater than the seventh preset temperature, the opening of the electronic expansion valve is increased according to the adjustment step.

[0152] In this embodiment, the method described in step S20118 is similar to the method described in the aforementioned step S10225, and for the sake of simplicity, it will not be repeated here.

[0153] Step S20119: When the difference is greater than the seventh preset temperature and the opening of the electronic expansion valve reaches the maximum, a temperature warning message is sent.

[0154] In this embodiment, the method described in step S20119 is similar to the method described in the aforementioned step S10226, and for the sake of simplicity, it will not be repeated here.

[0155] It should be pointed out that although the various steps in the above embodiments are described in a specific order, those skilled in the art can understand that in order to achieve the effects of the present invention, different steps do not have to be performed in such an order. They can be performed simultaneously (in parallel) or in other orders. These changes are within the scope of protection of the present invention.

[0156] It is understood by those skilled in the art that the present invention implements all or part of the processes in the method of the above embodiment, and can also be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a computer-readable storage medium, and the computer program can implement the steps of the above-mentioned various method embodiments when executed by the processor. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The computer-readable storage medium may include: any entity or device, medium, U disk, mobile hard disk, disk, optical disk, computer memory, read-only memory, random access memory, electric carrier signal, telecommunication signal and software distribution medium that can carry the computer program code. It should be noted that the content contained in the computer-readable storage medium can be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, computer-readable storage media do not include electric carrier signals and telecommunication signals.

[0157] Furthermore, the present invention also provides a control device. In an embodiment of a control device according to the present invention, the control device includes a processor and a storage device, the storage device can be configured to store a program for executing the control method of the air source heat pump of the above method embodiment, and the processor can be configured to execute the program in the storage device, which includes but is not limited to the program for executing the control method of the air source heat pump of the above method embodiment. For ease of explanation, only the parts related to the embodiment of the present invention are shown. For specific technical details not disclosed, please refer to the method part of the embodiment of the present invention. The control device can be a control device device formed by various electronic devices.

[0158] In the embodiment of the present invention, the control device may be a control device device formed by various electronic devices. In some possible implementations, the control device may include multiple storage devices and multiple processors. The program for executing the control method of the air source heat pump of the above method embodiment may be divided into multiple subprograms, each of which may be loaded and run by a processor to execute different steps of the control method of the air source heat pump of the above method embodiment. Specifically, each subprogram may be stored in different storage devices, and each processor may be configured to execute programs in one or more storage devices to jointly implement the control method of the air source heat pump of the above method embodiment, that is, each processor executes different steps of the control method of the air source heat pump of the above method embodiment, to jointly implement the control method of the air source heat pump of the above method embodiment.

[0159] The above-mentioned multiple processors may be processors deployed on the same device. For example, the above-mentioned control device may be a high-performance device composed of multiple processors, and the above-mentioned multiple processors may be processors configured on the high-performance device. In addition, the above-mentioned multiple processors may also be processors deployed on different devices. For example, the above-mentioned control device may be a server cluster, and the above-mentioned multiple processors may be processors on different servers in the server cluster.

[0160] Furthermore, the present invention also provides a computer-readable storage medium. In a computer-readable storage medium embodiment according to the present invention, the computer-readable storage medium can be configured to store a program for executing the control method of the air source heat pump of the above-mentioned method embodiment, and the program can be loaded and run by the processor to implement the control method of the above-mentioned air source heat pump. For ease of explanation, only the parts related to the embodiment of the present invention are shown. For specific technical details not disclosed, please refer to the method part of the embodiment of the present invention. The computer-readable storage medium can be a storage device formed by various electronic devices. Optionally, the computer-readable storage medium in the embodiment of the present invention is a non-temporary computer-readable storage medium.

[0161] Furthermore, the present invention also provides an air source heat pump. In an embodiment of an air source heat pump according to the present invention, the air source heat pump may include the control device in the control device embodiment.

[0162] Further, it should be understood that since the setting of each module is only for illustrating the functional units of the device of the present invention, the physical devices corresponding to these modules may be the processor itself, or a part of the software in the processor, a part of the hardware, or a part of the combination of software and hardware. Therefore, the number of each module in the figure is only schematic.

[0163] Those skilled in the art will appreciate that the modules in the device can be adaptively split or merged. Such splitting or merging of specific modules will not cause the technical solution to deviate from the principle of the present invention, and therefore, the technical solutions after splitting or merging will fall within the protection scope of the present invention.

[0164] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A control method for an air source heat pump, characterized in that: The method comprises: Acquire a real-time evaporation temperature of a compressor of the air source heat pump, and acquire a difference between the real-time evaporation temperature and a preset maximum evaporation temperature based on the real-time evaporation temperature; According to the difference, the opening degree of the electronic expansion valve and / or the gear position of the fan of the air source heat pump is controlled.

2. The control method of the air source heat pump according to claim 1, characterized in that: The step of controlling the opening of the electronic expansion valve and / or the gear position of the fan of the air source heat pump according to the difference comprises: When the difference is greater than a first preset temperature, controlling the gear position of the fan; and / or, When the difference is greater than a seventh preset temperature, the opening of the electronic expansion valve is controlled.

3. The control method of the air source heat pump according to claim 2, characterized in that: The controlling of the gear position of the fan comprises: At intervals of a first preset time length, obtaining the difference; When the difference is greater than the first preset temperature and less than or equal to the second preset temperature, controlling the fan to reduce a first preset gear; When the difference is greater than the second preset temperature, the fan is controlled to reduce a second preset gear; wherein the second preset gear is greater than the first preset gear; When the difference is greater than a third preset temperature and less than or equal to the first preset temperature, controlling the fan to maintain the current gear position; When the difference is less than or equal to the third preset temperature, exiting the control of the gear position of the fan; When the difference is greater than the first preset temperature and the fan gear is at the minimum, the compressor frequency of the air source heat pump is controlled.

4. The control method of the air source heat pump according to claim 3, characterized in that: The controlling of the compressor frequency of the air source heat pump comprises: Obtaining the number of adjustment steps based on the difference; At intervals of a second preset time length, obtaining the difference; When the difference is greater than a fourth preset temperature, increasing the compressor frequency according to the adjustment step number; When the difference is less than or equal to the fourth preset temperature, maintaining the compressor frequency; When the difference is greater than the fourth preset temperature and the compressor frequency reaches the maximum, sending a temperature warning message; The fourth preset temperature is lower than the first preset temperature and higher than the third preset temperature.

5. The control method of the air source heat pump according to claim 4, characterized in that: The obtaining of the number of adjustment steps based on the difference includes obtaining the number of adjustment steps according to the following formula: df=-1 / (Pst-Pstmax)×j Wherein, df is the adjustment step number, Pst is the real-time evaporation temperature, Pstmax is the preset maximum evaporation temperature, j is a constant and -j is less than the fourth preset temperature.

6. The control method of the air source heat pump according to claim 2, characterized in that: The controlling the opening degree of the electronic expansion valve comprises: Acquiring the current ambient temperature, and acquiring the target value of the suction superheat of the electronic expansion valve based on the current ambient temperature; Acquire a correction value based on the real-time evaporation temperature, and acquire a corrected suction superheat target value of the electronic expansion valve according to the correction value and the suction superheat target value; Obtaining a regulation step according to the corrected suction air superheat target value and the actual suction air superheat; Obtaining the difference at intervals of a third preset time length; When the difference is greater than a seventh preset temperature, increasing the opening of the electronic expansion valve according to the adjustment step; When the difference is greater than a seventh preset temperature and the opening of the electronic expansion valve reaches a maximum, a temperature warning message is sent.

7. The control method of the air source heat pump according to claim 6, characterized in that: The obtaining of the correction value based on the real-time evaporation temperature comprises: When the real-time evaporation temperature is greater than the fifth preset temperature, the correction value is assigned to a third preset value; when the real-time evaporation temperature is less than or equal to the fifth preset temperature and greater than the sixth preset temperature, the correction value is assigned to a fourth preset value; when the real-time evaporation temperature is less than or equal to the sixth preset temperature and greater than the seventh preset temperature, the correction value is assigned to a fifth preset value, wherein the third preset value is greater than the fourth preset value and greater than the fifth preset value; and / or, The step of obtaining the corrected target suction superheat value of the electronic expansion valve according to the correction value and the target suction superheat value comprises obtaining the corrected target suction superheat value according to the following formula: SH=SH1+SH2 Wherein, SH is the corrected suction superheat target value, SH2 is the corrected value, SH1 is the suction superheat target value; and / or, The obtaining of the adjustment step according to the modified suction superheat target value and the actual suction superheat comprises obtaining the adjustment step according to the following formula: dp=g×(SH'-SH)+h Wherein, dp is the adjustment step, SH' is the actual suction superheat, and g and h are both constants.

8. A control device, comprising at least one processor and at least one storage device, wherein the storage device is suitable for storing a plurality of program codes, characterized in that: The program code is suitable for being loaded and run by the processor to execute the control method of the air source heat pump according to any one of claims 1 to 7.

9. A computer-readable storage medium storing a plurality of program codes, characterized in that: The program code is suitable for being loaded and run by a processor to execute the control method of the air source heat pump according to any one of claims 1 to 7.

10. An air source heat pump, characterized in that: The air source heat pump comprises the control device according to claim 8.

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