CN114992906A - Control method of heat pump system, and readable storage medium - Google Patents
Control method of heat pump system, and readable storage medium Download PDFInfo
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- CN114992906A CN114992906A CN202110228922.8A CN202110228922A CN114992906A CN 114992906 A CN114992906 A CN 114992906A CN 202110228922 A CN202110228922 A CN 202110228922A CN 114992906 A CN114992906 A CN 114992906A
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- 238000000034 method Methods 0.000 title claims abstract description 81
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 237
- 238000005057 refrigeration Methods 0.000 claims abstract description 53
- 230000009467 reduction Effects 0.000 claims abstract description 29
- 238000010257 thawing Methods 0.000 claims description 29
- 230000000630 rising effect Effects 0.000 claims description 6
- 238000007710 freezing Methods 0.000 abstract description 34
- 230000008014 freezing Effects 0.000 abstract description 17
- 230000001276 controlling effect Effects 0.000 description 41
- 238000001704 evaporation Methods 0.000 description 17
- 230000008569 process Effects 0.000 description 15
- 230000008020 evaporation Effects 0.000 description 14
- 239000003507 refrigerant Substances 0.000 description 11
- 230000000694 effects Effects 0.000 description 9
- 239000007788 liquid Substances 0.000 description 7
- 230000033228 biological regulation Effects 0.000 description 5
- 238000001816 cooling Methods 0.000 description 5
- 230000006870 function Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000006872 improvement Effects 0.000 description 3
- 230000002265 prevention Effects 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 206010060904 Freezing phenomenon Diseases 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B30/00—Heat pumps
- F25B30/02—Heat pumps of the compression type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
- F25B47/02—Defrosting cycles
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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- General Engineering & Computer Science (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention provides a control method of a heat pump system, the heat pump system and a readable storage medium. The control method of the heat pump system comprises the following steps: responding to a starting instruction of a refrigeration mode, and acquiring a return air pressure value of the compressor; and adjusting the operation parameters of the heat pump system according to the return air pressure value. According to the technical scheme provided by the invention, the operation parameters of the heat pump system are adjusted through the return air pressure value, so that the reduction speed of the water temperature in the heat pump system can be controlled, the freezing in the heat pump system caused by the too fast reduction of the water temperature is avoided, the anti-freezing protection of the heat pump system is realized, the heat pump system can keep a normal refrigeration mode operation state, and the stability and the reliability of the operation of the heat pump system are improved.
Description
Technical Field
The invention relates to the technical field of heat pumps, in particular to a control method of a heat pump system, the heat pump system and a readable storage medium.
Background
Most air source heat pump water chiller-heater units in the market adopt plate heat exchangers as waterway heat exchangers. When the heat pump system operates in a refrigerating mode, the set temperature of the heat pump system is low, the volume of the refrigerant side in the plate type heat exchanger is small, the amount of the refrigerant is relatively small, after the refrigerant exchanges heat with circulating water rapidly, the evaporation temperature is too low and even is lower than the freezing point, in addition, in the refrigerating process, the variable frequency water pump operates in a constant temperature difference mode, and therefore part of water in the plate type heat exchanger is frozen, and the heat exchanger and the heat pump system are damaged.
Disclosure of Invention
The present invention has been made to solve at least one of the problems occurring in the prior art or the related art.
To this end, a first aspect of the invention provides a control method of a heat pump system.
The second aspect of the present invention also provides a heat pump system.
A third aspect of the invention also provides a readable storage medium.
In view of the above, a first aspect of the present invention provides a method for controlling a heat pump system, the heat pump system including a compressor and a water pump, including: responding to a starting instruction of a refrigeration mode, and acquiring a return air pressure value of the compressor; and adjusting the operation parameters of the heat pump system according to the return air pressure value.
According to the control method of the heat pump system, the return air pressure value of the compressor is obtained after the starting instruction of the refrigeration mode is received, and the operation parameters of the heat pump system are adjusted by detecting the return air pressure value. In the operation process of the refrigeration mode, the return air pressure value is used as the regulation standard of the heat pump system, the operation parameters of the heat pump system are adjusted, the reduction speed of the water temperature in the heat pump system can be controlled, the phenomenon that the water temperature is reduced too fast to cause freezing in the heat pump system is avoided, the anti-freezing protection of the heat pump system is realized, the heat pump system can keep a normal refrigeration mode operation state, and the operation stability and reliability of the heat pump system are improved.
According to the control method of the heat pump system provided by the invention, the following additional technical characteristics can be provided:
in the above technical solution, further, the step of adjusting the operation parameter of the heat pump system according to the return air pressure value specifically includes: controlling the frequency raising speed of the compressor to be within a preset speed range based on the condition that the return air pressure value is smaller than a first pressure threshold value, and adjusting the rotating speed of the water pump according to a first temperature difference threshold value; controlling the heat pump system to normally operate based on the return air pressure value being greater than the second pressure threshold value; wherein the first pressure threshold is less than the second pressure threshold.
In the technical scheme, in the operation process of the refrigeration mode, the acquired return air pressure value of the compressor is detected, if the return air pressure value is detected to be smaller than a first pressure threshold value, the frequency increasing speed of the compressor is limited within a preset speed range during the frequency increasing operation of the compressor, and the phenomenon that the frequency increasing speed of the compressor is too high to cause the too high speed of water temperature reduction in a heat pump system is avoided. In addition, the rotating speed of the water pump is adjusted, so that the temperature difference between the inlet water temperature and the outlet water temperature of the heat pump system is controlled to be a preset first temperature difference threshold value, the outlet water temperature of the heat pump system is increased, the possibility of freezing in the heat pump system is reduced, and the normal operation of the refrigeration mode of the heat pump system is ensured. By detecting the return air pressure value and adjusting the operation parameters of the compressor and the water pump, the heat pump system is accurately and pertinently controlled, and the reliability of anti-freezing protection of the heat pump system is improved. Further, if the return air pressure value is detected to be larger than the second pressure threshold value, the pressure in the heat pump system rises at the moment, the outlet water temperature of the heat pump system is high, the limitation on the frequency raising speed of the compressor and the rotating speed of the water pump is removed, the heat pump system can normally operate, the precision of controlling the anti-freezing protection of the heat pump system is improved, and the refrigerating effect of the heat pump system is ensured.
In any of the above technical solutions, further, the step of adjusting the operation parameter of the heat pump system according to the return air pressure value specifically further includes: controlling the compressor to maintain the current operating frequency or reduce the operating frequency based on the return air pressure value being smaller than the third pressure threshold value, and adjusting the rotating speed of the water pump according to the second temperature difference threshold value; controlling the frequency raising speed of the compressor to be within a preset speed range based on the fact that the return air pressure value is larger than a fourth pressure threshold value, and adjusting the rotating speed of the water pump according to a first preset temperature difference threshold value; the first pressure threshold is greater than or equal to the fourth pressure threshold and greater than the third pressure threshold, and the first temperature difference threshold is greater than the second temperature difference threshold.
In the technical scheme, after the operating frequency of the compressor is controlled according to the preset frequency increasing speed, if the return air pressure value is detected to be smaller than the third pressure threshold value, the return air pressure of the compressor is continuously reduced at the moment, the evaporation temperature in the heat pump system is continuously reduced, the compressor is controlled to maintain the current operating frequency or control the compressor to reduce the operating frequency, namely, the frequency increasing of the compressor is forbidden, the reducing speed of the water temperature in the heat pump system is further slowed down, the phenomenon that the evaporation temperature is too low due to the fact that the water temperature is too fast reduced is avoided, the possibility that the heat pump system is frozen is reduced, and the operating stability of the heat pump system is improved. Meanwhile, the rotating speed of the water pump is adjusted, so that the temperature difference between the inlet water temperature and the outlet water temperature of the heat pump system is controlled to be a second temperature difference threshold value, the outlet water temperature of the heat pump system is increased, the internal freezing of the heat pump system is avoided, and the fine control of the heat pump system is realized. Further, if the return air pressure value is greater than the fourth pressure value, the pressure in the heat pump system rises at the moment, the limitation of prohibiting the frequency rise of the compressor is withdrawn, the frequency rise of the compressor is carried out according to the preset speed, and meanwhile, the rotating speed of the water pump is adjusted, so that the temperature difference between the inlet water temperature and the outlet water temperature of the heat pump system is adjusted to the first temperature difference threshold value, the possibility of the refrigeration effect of the heat pump system is reduced due to the limitation of the running speed of the compressor and the water pump is avoided, and the practicability of the heat pump system is improved.
In any of the above technical solutions, further, the step of adjusting the operation parameter of the heat pump system according to the return air pressure value specifically further includes: adjusting the frequency of the compressor according to a preset frequency reduction speed based on the condition that the return air pressure value is smaller than a fifth pressure threshold value, and controlling the rotating speed of the water pump to be switched to a highest gear; controlling the compressor to maintain the current operating frequency or reduce the operating frequency based on the return air pressure value being greater than the sixth pressure threshold value, and adjusting the rotating speed of the water pump according to the second temperature difference threshold value; wherein the third pressure threshold is greater than or equal to the sixth pressure threshold is greater than the fifth pressure threshold.
In the technical scheme, after the compressor is controlled to maintain the current operating frequency or the compressor is controlled to reduce the operating frequency, if the return air pressure value is detected to be smaller than a fifth pressure threshold value, the pressure value of the compressor is too low at the moment, the evaporation temperature in the heat pump system is too low, the compressor is subjected to frequency reduction regulation according to the preset frequency reduction speed, and the reduction speed of the water temperature in the heat pump system is reduced. Through forcing the compressor to lower the frequency, can reduce the flow through refrigerant in this compressor effectively, evaporating temperature among the improvement heat pump system has further reduced the frozen probability and the possibility of heat pump system, simultaneously, open the rotational speed of water pump to highest gear for the water pump can be exported with maximum flow, avoids the compressor to lower the frequency during the operation, and the flow of water pump is not enough, and then leads to heat pump system internal pressure to hang down excessively, influences heat pump system's refrigeration effect. The heat pump system is protected from freezing, and the refrigeration effect of the heat pump system is ensured. Further, if the return air pressure value is detected to be larger than the sixth pressure threshold value, the return air pressure value of the heat pump system is increased at the moment, the water outlet temperature of the heat pump system is higher, the forced frequency reduction control on the compressor is quitted, the compressor is controlled to maintain the current operating frequency or the compressor is controlled to reduce the operating frequency, meanwhile, the rotating speed of the water pump is adjusted, the temperature difference between the water inlet temperature and the water outlet temperature of the heat pump system is controlled to be the second temperature difference threshold value, the water outlet temperature of the heat pump system is reduced, the fine control on the heat pump system is achieved, and the refrigeration efficiency of the heat pump system is improved. In any of the above technical solutions, further, the step of adjusting the operation parameter of the heat pump system according to the return air pressure value specifically further includes: controlling the heat pump system to stop running based on the return air pressure value being smaller than the seventh pressure threshold value; wherein the seventh pressure threshold is less than the fifth pressure threshold.
According to the technical scheme, after the compressor is subjected to frequency reduction regulation according to the preset frequency reduction speed, if the return air pressure value is detected to be smaller than the seventh pressure threshold value, the heat pump system is controlled to stop running, the possibility that the heat pump system is frozen due to the fact that the water temperature in the heat pump system is reduced too fast and the evaporation temperature is too low is avoided, freezing prevention protection of the heat pump system is achieved, and safety of the heat pump system is improved.
In any of the above technical solutions, further, the method for controlling a heat pump system further includes: acquiring the temperature difference between the inlet water temperature and the outlet water temperature of the heat pump system; based on the temperature difference being smaller than the third temperature difference threshold, reducing the rotating speed of the water pump according to the first gear; based on the temperature difference being larger than the fourth temperature difference threshold, increasing the rotation speed of the water pump according to the second gear; wherein the fourth temperature difference threshold is greater than the third temperature difference threshold.
In the technical scheme, in the operation process of the refrigeration mode, the temperature difference between the inlet water temperature and the outlet water temperature of the heat pump system is obtained, the rotating speed of the water pump is adjusted according to the preset temperature difference threshold range where the temperature difference is located, so that the water temperature reduction speed of the heat pump system is kept stable, and the stability and the reliability of the operation of the heat pump system are ensured by dynamically adjusting the rotating speed of the water pump.
In any of the above technical solutions, further, the method for controlling a heat pump system further includes: defrosting is carried out based on a refrigeration mode, and the outlet water temperature of the heat pump system is obtained; and controlling the compressor to operate to defrost according to a preset operation frequency corresponding to a preset temperature threshold area where the outlet water temperature is located.
In the technical scheme, if the refrigeration mode is used for defrosting, the outlet water temperature of the heat pump system is obtained, and the running of the compressor is controlled to defrost according to the preset running frequency of the preset temperature threshold area where the outlet water temperature is located. The running frequency of the compressor is controlled through the outlet water temperature of the heat pump system, and the defrosting time is reduced due to the fact that the water temperature is too low, so that defrosting of the heat pump system is quitted in advance due to anti-freezing protection, defrosting is not clean, and the reliability of the heat pump system is improved.
In any of the above technical solutions, further, the control method of the heat pump system further includes: and controlling the rotating speed of the water pump to be switched to the highest gear.
In the technical scheme, when the refrigeration mode is used for defrosting, the rotating speed of the water pump is controlled to be maximum, namely the water pump is enabled to output at the maximum flow, the possibility that defrosting is not clean due to early quitting of defrosting caused by freezing prevention protection of the heat pump system because the water temperature in the heat pump system is too low or the pressure in the heat pump system is too low is reduced, and the stability and the reliability of the operation of the defrosting mode of the heat pump system are improved.
According to a second aspect of the present invention, there is also provided a heat pump system comprising: a memory storing a program or instructions; and a processor connected with the detection device and the memory, the processor being configured to implement the control method of the heat pump system proposed by the first aspect when executing the program or the instructions. Therefore, the heat pump system has all the advantages of the control method of the heat pump system according to the first aspect, and details are not repeated herein.
According to a third aspect of the present invention, there is provided a readable storage medium having stored thereon a program or instructions which, when executed by a processor, performs the control method of the heat pump system set forth in the first aspect. Therefore, the readable storage medium has all the advantages of the control method of the heat pump system provided in the first aspect, and redundant description is omitted to avoid repetition.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 shows one of the flow diagrams of the control method of the heat pump system of one embodiment of the present invention;
fig. 2 shows a second flow chart of a control method of the heat pump system according to an embodiment of the invention;
fig. 3 shows a third flowchart of a method for controlling a heat pump system according to an embodiment of the present invention;
FIG. 4 is a flow chart showing a fourth example of a method for controlling the heat pump system according to the present invention;
fig. 5 shows a fifth flowchart of a control method of the heat pump system according to the embodiment of the invention;
fig. 6 shows a sixth flowchart of a control method of the heat pump system according to the embodiment of the invention;
fig. 7 shows a seventh flowchart of a control method of the heat pump system according to the embodiment of the invention;
fig. 8 shows an eighth flowchart of a control method of the heat pump system according to the embodiment of the invention;
fig. 9 is one of the schematic diagrams illustrating a control method of the heat pump system according to one embodiment of the present invention;
fig. 10 shows a second control method of the heat pump system according to the second embodiment of the present invention;
FIG. 11 shows a schematic diagram of a heat pump system according to an embodiment of the invention;
fig. 12 shows a schematic block diagram of a heat pump system of the present invention.
Wherein, the correspondence between the reference numbers and the part names in fig. 11 and 12 is:
1000 heat pump system, 1002 compressor, 1004 four-way valve, 1006 first heat exchanger, 1008 throttling device, 1010 water pump, 1012 second heat exchanger, 1014 gas-liquid separator, 1016 first temperature sensor, 1018 second temperature sensor, 1102 storage and 1104 processor.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.
A control method of a heat pump system, and a readable storage medium according to some embodiments of the present invention are described below with reference to fig. 1 to 12.
Example 1:
as shown in fig. 1, according to an embodiment of the present invention, there is provided a control method of a heat pump system, the method including:
102, responding to a starting instruction of a refrigeration mode, and acquiring a return air pressure value of a compressor;
and 104, adjusting the operation parameters of the heat pump system according to the return air pressure value.
In this embodiment, after receiving a start instruction of the refrigeration mode, a return air pressure value of the compressor is obtained, and an operation parameter of the heat pump system is adjusted by detecting the return air pressure value. In the operation process of the refrigeration mode, the return air pressure value is used as the regulation standard of the heat pump system, the operation parameters of the heat pump system are regulated, the reduction speed of the water temperature in the heat pump system can be controlled, the phenomenon that the water temperature is reduced too fast to cause freezing in the heat pump system is avoided, the anti-freezing protection of the heat pump system is realized, the heat pump system can keep a normal refrigeration mode operation state, and the stability and the reliability of the operation of the heat pump system are improved.
In the process of the refrigeration mode operation, if the evaporation temperature in the heat pump system is too low, the phenomenon of frosting or icing occurs in the heat pump system, so that the heat pump system cannot carry out normal refrigeration, and the liquid refrigerant with incomplete evaporation enters the compressor after frosting, so that the compressor is subjected to hydraulic compression and finally the compressor is damaged too quickly. Therefore, the control method of the heat pump system provided by the invention detects the return air pressure value of the compressor in real time during the operation of the refrigeration mode, limits the frequency of the compressor according to the low pressure value when the low pressure of the heat pump system is lower than the preset pressure threshold value, and controls the rotating speed of the water pump at the same time, so that the output capacity of the heat pump system is reduced, the water temperature in the heat pump system is prevented from being reduced too fast, and the anti-freezing protection of the heat pump system is further realized. Compared with the prior art, the temperature in the heat pump system is detected through the preset time point, the freezing condition of the heat pump system is further judged, the return air pressure value can more directly reflect the running state of the heat pump system, the influence of external environmental factors is avoided, the judgment real-time performance is higher, the accuracy is better, and the reliability of the anti-freezing protection control of the heat pump system is improved.
More importantly, the operation parameters of the heat pump system are adjusted through the preset pressure threshold value, the operation frequencies of the compressor and the water pump are respectively controlled in a targeted manner, a proper operation mode is selected, and anti-freezing measures are respectively taken in a targeted manner, so that the anti-freezing protection control of the heat pump system is more accurate, a better effect can be achieved, the normal operation of the heat pump system is ensured, the anti-freezing loss of the heat pump system is reduced, and the practicability of the heat pump system is improved.
Example 2:
as shown in fig. 2, according to an embodiment of the present invention, there is provided a control method of a heat pump system, the method including:
step 202, responding to a starting instruction of a refrigeration mode, and acquiring a return air pressure value of a compressor;
and step 210, controlling the heat pump system to normally operate.
In this embodiment, in the operation process of the refrigeration mode, the obtained return air pressure value of the compressor is detected, and if the return air pressure value is detected to be smaller than the first pressure threshold, the frequency increasing speed of the compressor is limited within a preset speed range during the frequency increasing operation of the compressor, so that the too high frequency increasing speed of the compressor is avoided, and the too high speed of reducing the water temperature in the heat pump system is avoided. In addition, the rotating speed of the water pump is adjusted, so that the temperature difference between the inlet water temperature and the outlet water temperature of the heat pump system is controlled to be a preset first temperature difference threshold value, the outlet water temperature of the heat pump system is increased, the possibility of freezing in the heat pump system is reduced, and the normal operation of the refrigeration mode of the heat pump system is ensured. By detecting the return air pressure value and adjusting the operation parameters of the compressor and the water pump, the heat pump system is accurately and pertinently controlled, and the reliability of anti-freezing protection of the heat pump system is improved.
Further, if the return air pressure value is detected to be larger than the second pressure threshold value, the pressure in the heat pump system rises at the moment, the outlet water temperature of the heat pump system is high, the limitation on the frequency rising speed of the compressor and the rotating speed of the water pump is removed, the heat pump system can normally operate, the precision of controlling the anti-freezing protection of the heat pump system is improved, and the refrigerating effect of the heat pump system is ensured.
Specifically, the first pressure threshold is less than the second pressure threshold, e.g., the first pressure threshold may be set to 0.9 and the second pressure threshold may be set to 1. Through reasonably setting the pressure threshold, the reduction speed of the water temperature in the heat pump system can be reasonably controlled, the possibility of freezing in the heat pump system due to too low evaporation temperature is avoided, and the performance of the heat pump system and the stability of the heat pump system during operation are favorably improved.
Example 3:
as shown in fig. 3, according to an embodiment of the present invention, there is provided a control method of a heat pump system, the method including:
step 302, responding to a starting instruction of a refrigeration mode, and acquiring a return air pressure value of a compressor;
step 312, determining whether the return air pressure value is greater than a fourth pressure threshold, if so, entering step 314, otherwise, entering step 310;
step 314, controlling the frequency increasing speed of the compressor to be within a preset speed range, and adjusting the rotating speed of the water pump according to a first preset temperature difference threshold value;
step 316, judging whether the return air pressure value is greater than a second pressure threshold value, if so, entering step 318, otherwise, entering step 314;
and step 318, controlling the heat pump system to normally operate.
In this embodiment, after the operating frequency of the compressor is controlled according to the preset frequency increasing speed, if it is detected that the return air pressure value is smaller than the third pressure threshold value, at this time, the return air pressure of the compressor is continuously reduced, and the evaporation temperature in the heat pump system is continuously reduced, the compressor is controlled to maintain the current operating frequency or to reduce the operating frequency, that is, the frequency increasing of the compressor is prohibited, so that the reducing speed of the water temperature in the heat pump system is slowed down, the phenomenon that the evaporation temperature is too low due to too fast reduction of the water temperature is avoided, the possibility that the heat pump system is frozen is reduced, and the operating stability of the heat pump system is improved. Meanwhile, the rotating speed of the water pump is adjusted, so that the temperature difference between the inlet water temperature and the outlet water temperature of the heat pump system is controlled to be a second temperature difference threshold value, the outlet water temperature of the heat pump system is increased, the freezing in the heat pump system is avoided, and the fine control of the heat pump system is realized. Further, if the return air pressure value is greater than the fourth pressure value, the pressure in the heat pump system rises at the moment, the limitation of forbidding frequency rise of the compressor is withdrawn, the frequency rise of the compressor is carried out according to the preset speed, and meanwhile, the rotating speed of the water pump is adjusted, so that the temperature difference between the inlet water temperature and the outlet water temperature of the heat pump system is adjusted to the first temperature difference threshold value, the running speed of the compressor and the water pump is prevented from being limited, the possibility of the refrigeration effect of the heat pump system is reduced, and the practicability of the heat pump system is improved.
Specifically, the first pressure threshold is greater than or equal to the fourth pressure threshold is greater than the third pressure threshold, e.g., the third pressure threshold may be set to 0.8 and the fourth pressure threshold may be set to 0.85. Through reasonable setting of the pressure threshold value, the return air pressure value detected by the compressor is forbidden to be increased in frequency to the compressor when continuously reduced, the running speed of the compressor is avoided to be too high, the water temperature in the heat pump system is reduced too fast, the heat pump system is enabled to generate a freezing phenomenon, meanwhile, when the return air pressure value detected by the compressor is continuously increased, the frequency limitation on the running of the compressor is withdrawn, and the running flexibility of the heat pump system is improved. Further, the first temperature difference threshold is greater than the second temperature difference threshold, e.g., the first temperature difference threshold is set to 5 and the second temperature difference threshold is set to 3. Through the reasonable temperature difference threshold value that sets up, through the rotational speed of adjusting the water pump, the temperature difference of temperature of intaking and leaving water temperature in the control heat pump system, and then control heat pump system's leaving water temperature promotes the security of heat pump system operation.
Example 4:
as shown in fig. 4, according to an embodiment of the present invention, there is provided a control method of a heat pump system, the method including:
step 402, responding to a starting instruction of a refrigeration mode, and acquiring a return air pressure value of a compressor;
step 406, controlling the frequency increasing speed of the compressor to be within a preset speed range, and adjusting the rotating speed of the water pump according to a first temperature difference threshold value;
step 410, controlling the compressor to maintain the current operation frequency or reduce the operation frequency, and adjusting the rotation speed of the water pump according to a second temperature difference threshold value;
step 414, adjusting the frequency of the compressor according to a preset frequency reduction speed, and controlling the rotating speed of the water pump to be switched to the highest gear;
step 418, controlling the compressor to maintain the current operating frequency or reduce the operating frequency, and adjusting the rotating speed of the water pump according to a second temperature difference threshold value;
step 424, controlling the frequency rising speed of the compressor to be within a preset speed range, and adjusting the rotating speed of the water pump according to a first temperature difference threshold value;
and 428, controlling the heat pump system to normally operate.
In this embodiment, after the compressor is controlled to maintain the current operating frequency or the compressor is controlled to decrease the operating frequency, if it is detected that the return air pressure value is smaller than the fifth pressure threshold, at this time, the pressure value of the compressor is too low, and the evaporation temperature in the heat pump system is too low, the compressor is subjected to frequency reduction adjustment according to a preset frequency reduction speed, so that the speed of decreasing the water temperature in the heat pump system is slowed down. Through forcing the compressor to lower the frequency, can reduce the flow through refrigerant in this compressor effectively, evaporating temperature among the improvement heat pump system has further reduced the frozen probability and the possibility of heat pump system, simultaneously, open the rotational speed of water pump to highest gear for the water pump can be exported with maximum flow, avoids the compressor to lower the frequency during the operation, and the flow of water pump is not enough, and then leads to heat pump system internal pressure to hang down excessively, influences heat pump system's refrigeration effect. The heat pump system is protected from freezing, and the refrigeration effect of the heat pump system is ensured. Further, if the return air pressure value is detected to be larger than the sixth pressure threshold value, the return air pressure value of the heat pump system is increased at the moment, the water outlet temperature of the heat pump system is higher, the forced frequency reduction control on the compressor is quitted, the compressor is controlled to maintain the current operating frequency or the compressor is controlled to reduce the operating frequency, meanwhile, the rotating speed of the water pump is adjusted, the temperature difference between the water inlet temperature and the water outlet temperature of the heat pump system is controlled to be the second temperature difference threshold value, the water outlet temperature of the heat pump system is reduced, the fine control on the heat pump system is achieved, and the refrigeration efficiency of the heat pump system is improved.
Specifically, the third pressure threshold is greater than or equal to the sixth pressure threshold greater than the fifth pressure threshold, e.g., the fifth pressure threshold may be set to 0.7 and the sixth pressure threshold may be set to 0.75. Through reasonable setting of the pressure threshold value, the return air pressure value of the compressor is detected, and when the return air pressure value is continuously reduced, the compressor is forcibly subjected to frequency reduction adjustment, so that the phenomenon that the water temperature in the heat pump system is too fast to reduce is avoided, the heat pump system is frozen, and meanwhile, when the return air pressure value of the compressor is detected to continuously rise, the forced frequency reduction limitation on the operation of the compressor is withdrawn, the efficiency of a refrigeration mode of the heat pump system is ensured, and the energy consumption of the heat pump system is reduced.
Example 5:
as shown in fig. 5, according to an embodiment of the present invention, there is provided a control method of a heat pump system, the method including:
step 514, adjusting the frequency of the compressor according to the preset frequency reduction speed, and controlling the rotating speed of the water pump to be switched to the highest gear;
and step 518, controlling the heat pump system to stop running.
In this embodiment, after the compressor is down-regulated at the preset down-conversion speed, if it is detected that the return air pressure value is smaller than the seventh pressure threshold value, the heat pump system is controlled to stop operating, so as to avoid the possibility that the heat pump system is frozen due to too fast reduction speed and too low evaporation temperature of water in the heat pump system, so as to realize anti-freezing protection of the heat pump system and improve the safety of the heat pump system.
Wherein the seventh pressure threshold is less than the fifth pressure threshold, for example, the seventh pressure threshold may be set to 0.6. Through reasonable setting of the pressure threshold value, when the return air pressure of the compressor is continuously reduced, the heat pump system is controlled to stop running in time, the phenomenon that the evaporation temperature in the heat pump system is too low, the heat pump system is damaged, and the service life of the heat pump system is prolonged is avoided.
Example 6:
as shown in fig. 6, according to an embodiment of the present invention, there is provided a control method of a heat pump system, the method including:
and step 616, controlling the water pump to operate according to the current rotating speed.
In this embodiment, in the operation process of the cooling mode, the temperature difference between the inlet water temperature and the outlet water temperature of the heat pump system is obtained, and the rotation speed of the water pump is adjusted according to the preset temperature difference threshold range where the temperature difference is located, so that the temperature difference between the inlet water temperature and the outlet water temperature of the heat pump system is kept stable. The rotating speed of the water pump is dynamically adjusted to ensure the stability of the temperature difference between the inlet water temperature and the outlet water temperature of the heat pump system, and the stability and the reliability of the operation of the heat pump system are improved.
Specifically, the temperature difference between the inlet water temperature and the outlet water temperature of the heat pump system is periodically detected, and if the detected temperature difference is smaller than a third temperature difference threshold value, that is, the temperature difference between the inlet water temperature and the outlet water temperature of the heat pump system is too small, the rotating speed of the water pump is controlled to be reduced according to the first gear until the rotating speed of the water pump is adjusted to the minimum gear, so that the flow rate of the water pump is reduced, and the temperature difference between the inlet water temperature and the outlet water temperature of the heat pump system is appropriately increased. Further, if the temperature difference is detected to be larger than the fourth temperature difference threshold value, that is, the temperature difference between the inlet water temperature and the outlet water temperature of the heat pump system is too large, the rotating speed of the water pump is controlled to be increased according to the second gear, the flow of the water pump is increased until the rotating speed of the water pump is switched to the maximum gear, and then the flow of the water pump is increased, so that the temperature difference between the inlet water temperature and the outlet water temperature of the heat pump system is appropriately reduced. The rotating speed of the water pump is dynamically adjusted to ensure the stability of the temperature difference between the inlet water temperature and the outlet water temperature of the heat pump system, and the stability and the reliability of the operation of the heat pump system are improved.
It can be understood that the third temperature difference threshold and the fourth temperature difference threshold can be reasonably set according to equipment parameters and operating parameters of the heat pump system, if the return air pressure value is detected to be smaller than the first pressure threshold, the frequency of the compressor is increased for limitation, the rotating speed of the water pump is adjusted according to the first temperature difference threshold, and the third temperature difference threshold and the fourth temperature difference threshold are set according to the first temperature difference threshold; and if the return air pressure value is smaller than the third pressure threshold value, prohibiting the frequency increase of the compressor, adjusting the rotating speed of the water pump according to the second temperature difference threshold value, and setting the third temperature difference threshold value and the fourth temperature difference threshold value according to the second temperature difference threshold value. Through reasonable setting of the third temperature difference threshold value and the fourth temperature difference threshold value, the rotating speed of the water pump is dynamically adjusted according to the third temperature difference threshold value and the fourth temperature difference threshold value, and the stability of the operation of the heat pump system is ensured.
In a specific embodiment, if it is detected that the return air pressure value is smaller than the first pressure threshold, the first temperature difference threshold is set to be 5 ℃ according to the return air pressure value, the third temperature difference threshold may be set to be 4 ℃, and the fourth temperature difference threshold is set to be 6 ℃; if the return air pressure value is detected to be smaller than the third pressure threshold value, the second temperature difference threshold value is set to be 3 ℃ according to the return air pressure value, the third temperature difference threshold value can be set to be 2 ℃, and the fourth temperature difference threshold value can be set to be 4 ℃. Further, the water temperature of the heat pump system is monitored every 60 seconds, if the temperature difference is detected to be smaller than a third temperature difference threshold value, the rotating speed of the water pump is controlled to be reduced by 1 gear at the current rotating speed until the rotating speed is reduced to the minimum gear, the water pump keeps running at the lowest gear, and the temperature difference between the inlet water temperature and the outlet water temperature of the heat pump system is increased moderately; and if the temperature difference is detected to be larger than the fourth temperature difference threshold value, controlling the rotating speed of the water pump to be increased by 1 gear on the current rotating speed until the rotating speed is increased to the maximum gear, and keeping the water pump to operate at the highest gear so that the temperature difference between the inlet water temperature and the outlet water temperature of the heat pump system is properly reduced. The stability of the temperature difference of water in the heat pump system is ensured. In addition, considering that the water temperature is usually not obviously reduced during a period of time when refrigeration is just started, and the heat pump system cannot be frozen, the water temperature can be periodically monitored after the period of time when refrigeration is started. For example, the water temperature may be monitored every 60 seconds after 15 minutes of starting cooling.
Example 7:
as shown in fig. 7, according to an embodiment of the present invention, there is provided a control method of a heat pump system, the method including:
and 708, controlling the compressor to operate to defrost according to a preset operation frequency corresponding to a preset temperature threshold area where the outlet water temperature is located.
In this embodiment, if the refrigeration mode is used for defrosting, the outlet water temperature of the heat pump system is obtained, and the operation of the compressor is controlled to defrost according to the preset operation frequency of the compressor corresponding to the preset temperature threshold region where the outlet water temperature is located. The running frequency of the compressor is controlled through the outlet water temperature of the heat pump system, and the defrosting time is reduced due to the fact that the water temperature is too low, so that defrosting of the heat pump system is quitted in advance due to anti-freezing protection, defrosting is not clean, and the reliability of the heat pump system is improved.
Further, if the refrigeration mode is used for defrosting, the operation of the compressor can be controlled to defrost according to the preset operation frequency of the compressor corresponding to the preset pressure threshold value area where the return air pressure value is located. The higher the return air pressure value of the compressor is, the higher the running frequency of the compressor is, the lower the pressure in the heat pump system is avoided from being too low, the water temperature reduction speed is too high, the condition that the heat pump system stops running due to the fact that the water temperature is too low to perform anti-freezing protection is avoided, and the defrosting performance of the heat pump system and the stability of defrosting mode running are effectively improved.
In a specific embodiment, the higher the outlet water temperature of the heat pump system is, the faster the operating frequency of the compressor is, that is, the outlet water temperature of the heat pump system has a positive relationship with the operating frequency of the compressor. Wherein the value range of the outlet water temperature of the heat pump system is set to be 30-50 ℃, and the value range of the running frequency of the compressor is 30-60 Hz. If the temperature of the effluent is less than 30 ℃, the operating frequency of the compressor is 30 Hz; if the effluent temperature is more than or equal to 30 ℃ and less than 40 ℃, the running frequency of the compressor is 40 Hz; if the effluent temperature is more than or equal to 40 ℃ and less than 50 ℃, the running frequency of the compressor is 50 Hz; if the temperature of the effluent is less than or equal to 50 ℃, the running frequency of the compressor is 60 Hz. By reasonably setting the operating frequency of the compressor, the reduction speed of the water temperature in the heat pump system can be reasonably controlled, the low water outlet temperature is reduced, the possibility of freezing in the heat pump system is reduced, and the defrosting performance of the heat pump system and the stability during defrosting mode operation are favorably improved.
Example 8:
as shown in fig. 8, according to an embodiment of the present invention, there is provided a control method of a heat pump system, the method including:
806, defrosting based on a refrigeration mode to obtain the outlet water temperature of the heat pump system;
808, controlling the compressor to operate to defrost according to a preset operation frequency corresponding to a preset temperature threshold area where the outlet water temperature is located;
and step 810, controlling the opening of the water pump to be opened to the highest gear.
In this embodiment, in the technical scheme, when the refrigeration mode is used for defrosting, the rotation speed of the water pump is controlled to be switched to the maximum gear, that is, the water pump is enabled to output at the maximum flow rate, so that the phenomenon that defrosting exits in advance due to frost prevention protection because the outlet water temperature of the heat pump system is low and the inlet water temperature of the heat pump system is large is avoided, and the defrosting is not clean, and the stability and reliability of the defrosting mode operation of the heat pump system are improved.
Example 9:
as shown in fig. 9, according to an embodiment of the present invention, a method for controlling a heat pump system includes: when the heat pump system is in a refrigeration mode operation period, acquiring a return air pressure value of the compressor, if the detected return air pressure value is smaller than a first pressure threshold value, performing frequency increasing limitation on the compressor, and adjusting the rotating speed of the water pump according to a first temperature difference threshold value; if the return air pressure value is smaller than the third pressure threshold value, prohibiting the frequency increase of the compressor, and adjusting the rotating speed of the water pump according to the second temperature difference threshold value; if the return air pressure value is detected to be smaller than a fifth pressure threshold value, performing frequency reduction control on the compressor and performing maximum output control on the water pump; and if the return air pressure value is detected to be smaller than the seventh pressure threshold value, stopping the operation of the heat pump system.
Further, if the return air pressure value is detected to be larger than a sixth pressure threshold value, the frequency increase of the compressor is forbidden, and the rotating speed of the water pump is adjusted according to a second temperature difference threshold value; if the return air pressure value is detected to be larger than the fourth pressure threshold value, limiting the frequency rising of the compressor, and adjusting the rotating speed of the water pump according to the first temperature difference threshold value; and if the return air pressure value is detected to be larger than the second pressure threshold value, the heat pump system is not limited and is normally adjusted.
Specifically, in the process of operation and refrigeration of the heat pump system, when the return air pressure value of the heat pump system is lower than a preset pressure threshold value, the frequency of the compressor is limited according to the return air pressure value, so that the output capacity of the heat pump system is reduced, and the phenomenon that the temperature of water in the heat pump system is reduced too fast is prevented. Simultaneously, through adjusting water pump output for when evaporating pressure was crossed low, increase discharge ensured that heat pump system can effectively promote the return air pressure value when the return air pressure value is crossed low. And after the compressor is started, starting to detect the return air pressure value of the compressor, and limiting the running frequency of the compressor according to the detected return air pressure.
As shown in table 1, when it is detected that the return air pressure value is less than P1, if the compressor is in the frequency increasing stage, the frequency increasing of the compressor is limited, for example, the compressor needs to meet the frequency operation of increasing 4Hz at most every minute, so as to avoid the rapid increase of the capacity of the heat pump system, which results in the rapid decrease of the water temperature; the limit is exited when a return air pressure value greater than P1+0.1 is detected. When the return air pressure value is detected to be smaller than P2, the compressor is prohibited from increasing the frequency; the limit is exited when a return air pressure value greater than P2+0.1 is detected. When the return air pressure value is detected to be less than P3, and the low pressure of the heat pump system is too low, the compressor is forcibly subjected to frequency reduction control, for example, the compressor is operated at the frequency of 4Hz reduced every 0.5 minute, and meanwhile, the water pump is forcibly operated at the maximum rotating speed, so that the water flow is controlled to be maximum; the limit is exited when a return air pressure value greater than P3+0.1 is detected. When the return air pressure value is detected to be less than P4, the evaporation temperature is too low, the heat pump system is possible to freeze, and the heat pump system enters refrigeration, is prevented from freezing and stops.
TABLE 1
| First pressure threshold | Third pressure threshold | Fifth pressure threshold | Seventh pressure threshold |
| P1 | P2 | P3 | 94 |
Further, the refrigeration mode of the heat pump system can be used for defrosting, and in the defrosting process, the running frequency of the compressor is controlled according to the outlet water temperature of the heat pump system so as to defrost. As shown in table 2, the preset temperature threshold value region is corresponding to the compressor operation frequency, where T1 < T2 < T3, and F1 < F2 < F3 < F4, i.e. the preset temperature threshold value is in a positive relationship with the compressor frequency. Meanwhile, the output of the water pump is directly opened to the maximum to operate at the maximum flow, so that the defrosting can not be forcibly quitted due to too low water temperature or too low pressure in the defrosting process.
TABLE 2
Further, as shown in fig. 10, when the heat pump system is in the cooling mode, the rotation speed of the water pump is controlled according to the current flow rate, and if it is detected that the temperature difference between the inlet water temperature and the outlet water temperature of the heat pump system is smaller than a third temperature difference threshold value, the rotation speed of the water pump is controlled to be reduced by one gear according to the current flow rate until the minimum gear is kept unchanged; and if the temperature difference between the inlet water temperature and the outlet water temperature of the heat pump system is detected to be larger than a fourth temperature difference threshold value, controlling the rotating speed of the water pump to be increased by one gear according to the current flow until the maximum gear is kept unchanged. The rotating speed of the water pump is adjusted by judging the temperature difference between the inlet water temperature and the outlet water temperature of the heat pump system. Specifically, the default temperature difference of the inlet and outlet water for refrigeration is delta T, the third temperature difference threshold value is delta T-1, and the fourth temperature difference threshold value is delta T + 1. Judging the temperature difference between the inlet water temperature and the outlet water temperature of the heat pump system every 60 seconds, and controlling the rotating speed of the water pump to be reduced by 1 gear at the current flow until the minimum gear when the temperature difference between inlet water and outlet water is smaller than delta T-1, namely the temperature difference between the inlet water and the outlet water is too small; when the temperature difference of the inlet water and the outlet water is larger than delta T +1, namely the temperature difference of the inlet water and the outlet water is too large, the rotating speed of the water pump is controlled to rise by 1 gear at the current flow until the maximum gear.
Example 10:
according to an embodiment of the second aspect of the present invention, there is provided a heat pump system 1000, comprising: a memory 1102, the memory 1102 storing programs or instructions; the processor 1104 is connected to the memory 1102, and the processor 1104 is configured to implement the control method of the heat pump system according to the first aspect when executing the program or the instructions. Therefore, the readable storage medium has all the advantages of the control method of the heat pump system provided in the first aspect, and redundant description is omitted to avoid repetition.
In a particular embodiment, as shown in fig. 11 and 12, the heat pump system includes a compressor 1002, a four-way valve 1004, a first heat exchanger 1006, a throttle 1008, a water pump 1010, a second heat exchanger 1012, a gas-liquid separator 1014, a first temperature sensor 1016, and a second temperature sensor 1018. The heat pump system can be operated in a variety of operating modes, wherein in the variety of operating modes, either the first heat exchanger 1006 or the second heat exchanger 1012 can be used as a condenser. Specifically, compressor 1002 is connected to first heat exchanger 1006 and second heat exchanger 1012 via four-way valve 1004, and four-way valve 1004 is used to switch the on/off relationship between first heat exchanger 1006 and second heat exchanger 1012 and compressor 1002. The first and second heat exchangers 1006, 1012 are switched between evaporator and condenser modes, thereby controlling the heat pump system to switch between cooling and heating modes. It is understood that the evaporator mode refers to a state where the heat exchanger functions as an evaporator, and the condenser mode refers to a state where the heat exchanger functions as a condenser.
Further, the first heat exchanger 1006 is used for exchanging heat between the refrigerant and the outdoor air, and completes the temperature adjusting process together with the second heat exchanger 1012. The second heat exchanger 1012 is used for exchanging heat between a refrigerant and heat exchange working media such as water, so as to achieve the purpose of refrigeration or heating. The liquid enters and exits the second heat exchanger 1012 under the driving of the water pump 1010, and exchanges heat with the refrigerant flowing through the second heat exchanger 1012.
Further, the throttling device 1008 is disposed between the first heat exchanger 1006 and the second heat exchanger 1012, and is configured to throttle the refrigerant flowing from the first heat exchanger 1006 to the second heat exchanger 1012 or flowing from the second heat exchanger 1012 to the first heat exchanger 1006.
Further, the heat pump system further comprises a gas-liquid separator 1014, and the four-way valve 1004 is connected with a suction port of the compressor 1002 through the gas-liquid separator 1014 so as to reduce the risk of liquid return of the compressor 1002.
Specifically, as shown in fig. 11, when the heat pump system is in the cooling mode, the refrigerant flowing out of the compressor 1002 flows through the first heat exchanger 1006, is throttled by the throttle device 1008, enters the second heat exchanger 1012 after being changed to a low-pressure state, and finally flows back to the compressor 1002. During the operation of the refrigeration mode, the return air pressure value of the compressor 1002 is obtained, and the operation frequency of the compressor 1002 and the rotation speed of the water pump 1010 are adjusted by taking the return air pressure value as the regulation standard of the heat pump system, so that the reduction speed of the water temperature in the heat pump system is controlled, the phenomenon that the water temperature is reduced too fast to cause freezing in the heat pump system is avoided, and the anti-freezing protection of the heat pump system is realized.
Example 11:
according to a third aspect of the present invention, there is provided a readable storage medium having stored thereon a program or instructions which, when executed by a processor, performs the control method of the heat pump system set forth in the first aspect. Therefore, the readable storage medium has all the advantages of the control method of the heat pump system provided in the first aspect, and redundant description is omitted to avoid repetition.
The processor is the processor in the communication device in the above embodiment. Readable storage media, including computer-readable storage media, such as Read-Only Memory (ROM), Random Access Memory (RAM), magnetic or optical disks, etc.
In the present invention, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element. Further, it should be noted that the scope of the methods and apparatus of the embodiments of the present application is not limited to performing the functions in the order illustrated or discussed, but may include performing the functions in a substantially simultaneous manner or in a reverse order based on the functions involved, e.g., the methods described may be performed in an order different than that described, and various steps may be added, omitted, or combined. In addition, features described with reference to certain examples may be combined in other examples.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solutions of the present application may be embodied in the form of a software product, which is stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal (such as a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the methods of the embodiments of the present application.
In the description herein, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A control method of a heat pump system including a compressor and a water pump, characterized by comprising:
responding to a starting instruction of a refrigeration mode, and acquiring a return air pressure value of the compressor;
and adjusting the operating parameters of the heat pump system according to the return air pressure value.
2. The method for controlling a heat pump system according to claim 1, wherein the adjusting the operating parameter of the heat pump system according to the return air pressure value specifically includes:
controlling the frequency rising speed of the compressor to be within a preset speed range based on the condition that the return air pressure value is smaller than a first pressure threshold value, and adjusting the rotating speed of the water pump according to a first temperature difference threshold value;
controlling the heat pump system to normally operate based on the return air pressure value being greater than a second pressure threshold value;
wherein the first pressure threshold is less than the second pressure threshold.
3. The method for controlling a heat pump system according to claim 2, wherein the adjusting the operating parameter of the heat pump system according to the return air pressure value further includes:
controlling the compressor to maintain the current operation frequency or reduce the operation frequency based on the condition that the return air pressure value is smaller than a third pressure threshold value, and adjusting the rotating speed of the water pump according to a second temperature difference threshold value;
controlling the frequency rising speed of the compressor to be within the preset speed range based on the condition that the return air pressure value is larger than a fourth pressure threshold value, and adjusting the rotating speed of the water pump according to the first preset temperature difference threshold value;
wherein the first pressure threshold is greater than or equal to the fourth pressure threshold is greater than the third pressure threshold.
4. The method for controlling a heat pump system according to claim 3, wherein the adjusting the operating parameter of the heat pump system according to the return air pressure value further includes:
adjusting the frequency of the compressor according to a preset frequency reduction speed based on the condition that the return air pressure value is smaller than a fifth pressure threshold value, and controlling the rotation speed of the water pump to be started to a highest gear;
controlling the compressor to maintain the current operation frequency or reduce the operation frequency based on the fact that the return air pressure value is larger than a sixth pressure threshold value, and adjusting the rotating speed of the water pump according to a second temperature difference threshold value;
wherein the third pressure threshold is greater than or equal to the sixth pressure threshold is greater than the fifth pressure threshold, and the first temperature differential threshold is greater than the second temperature differential threshold.
5. The method for controlling a heat pump system according to claim 4, wherein the adjusting the operating parameter of the heat pump system according to the return air pressure value further comprises:
controlling the heat pump system to stop running based on the return air pressure value being smaller than a seventh pressure threshold value;
wherein the seventh pressure threshold is less than the fifth pressure threshold.
6. The control method of the heat pump system according to any one of claims 1 to 5, characterized by further comprising:
acquiring the temperature difference between the inlet water temperature and the outlet water temperature of the heat pump system;
based on the temperature difference being smaller than a third temperature difference threshold, reducing the rotation speed of the water pump according to a first gear;
increasing the rotation speed of the water pump according to a second gear based on the temperature difference being larger than a fourth temperature difference threshold;
wherein the third temperature difference threshold is greater than the fourth temperature difference threshold.
7. The control method of the heat pump system according to claim 1, characterized by further comprising:
defrosting based on the refrigeration mode, and acquiring the outlet water temperature of the heat pump system;
and controlling the compressor to operate to defrost according to a preset operation frequency corresponding to a preset temperature threshold area where the outlet water temperature is located.
8. The control method of the heat pump system according to claim 7, characterized by further comprising:
and controlling the rotating speed of the water pump to be switched to the highest gear.
9. A heat pump system, comprising:
a memory storing a program or instructions;
a processor connected to the memory, the processor when executing the program or instructions implementing a method of controlling a heat pump system according to any one of claims 1 to 8.
10. A readable storage medium on which a program or instructions are stored, characterized in that the program or instructions, when executed by a processor, carry out the steps of a method of controlling a heat pump system according to any one of claims 1 to 8.
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