CN115096015B - Heat pump refrigeration anti-freezing method, device and control system - Google Patents
Heat pump refrigeration anti-freezing method, device and control system Download PDFInfo
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- CN115096015B CN115096015B CN202210766687.4A CN202210766687A CN115096015B CN 115096015 B CN115096015 B CN 115096015B CN 202210766687 A CN202210766687 A CN 202210766687A CN 115096015 B CN115096015 B CN 115096015B
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- 238000005057 refrigeration Methods 0.000 title claims abstract description 147
- 238000000034 method Methods 0.000 title claims abstract description 38
- 238000007710 freezing Methods 0.000 title claims abstract description 20
- 239000003507 refrigerant Substances 0.000 claims abstract description 35
- 230000002528 anti-freeze Effects 0.000 claims description 15
- 238000001816 cooling Methods 0.000 claims description 7
- 238000001514 detection method Methods 0.000 claims description 3
- 230000008569 process Effects 0.000 abstract description 5
- 238000001704 evaporation Methods 0.000 abstract description 3
- 230000001276 controlling effect Effects 0.000 description 10
- 238000010586 diagram Methods 0.000 description 6
- 238000010257 thawing Methods 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 230000006870 function Effects 0.000 description 4
- 238000004891 communication Methods 0.000 description 3
- 238000004590 computer program Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 230000000981 bystander Effects 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000000523 sample Substances 0.000 description 2
- 101710176296 Switch 2 Proteins 0.000 description 1
- 238000013473 artificial intelligence Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000010801 machine learning Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
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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
- F25B13/00—Compression machines, plants or systems, with reversible cycle
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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
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/31—Expansion valves
- F25B41/34—Expansion valves with the valve member being actuated by electric means, e.g. by piezoelectric actuators
-
- 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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- 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
- F25B2347/00—Details for preventing or removing deposits or corrosion
- F25B2347/02—Details of defrosting cycles
Abstract
The invention discloses a heat pump refrigeration anti-freezing method, a heat pump refrigeration anti-freezing device and a heat pump refrigeration anti-freezing control system, wherein the method comprises the steps of detecting the temperature of a refrigeration coil pipe at intervals of a preset first time interval in a refrigeration mode; the opening degree of the electronic expansion valve and the frequency of the compressor are respectively adjusted according to the temperature of the refrigeration coil; if the temperature of the refrigeration coil is still smaller than the first preset temperature after the first time is continuously preset, the operation of the compressor is stopped, and a fault is reported. The invention solves the technical problem that the heat pump unit can not judge the evaporating temperature in the starting refrigeration process, so that the heat exchanger is frosted when the unit operates or the refrigerant is absent.
Description
Technical Field
The invention relates to the technical field of heat pump control, in particular to a heat pump refrigeration anti-freezing method, a heat pump refrigeration anti-freezing device and a heat pump refrigeration anti-freezing control system.
Background
At present, the method for solving the anti-freezing control of the air-cooled heat pump unit generally comprehensively judges through system pressure and temperature, for example, by testing the water outlet temperature of the plate heat exchanger and the suction pressure of the compressor, when the water outlet temperature of the plate heat exchanger is lower than a limiting value and the evaporation temperature corresponding to the suction pressure is also lower than the limiting value, stopping the machine, namely stopping the machine when both conditions are met; although this solution can achieve the purpose of anti-freezing protection, the following problems still remain: factors influencing the water outlet temperature are more, such as the water inlet temperature, the water flow and the heat exchange quantity (temperature and flow) at the side of a refrigerant, and the application scene has not only a refrigeration mode but also the condition of defrosting of a system, and the shutdown can play a role in protection, but can cause function interruption to influence the further functions of the system, such as interruption in the middle of defrosting, incomplete defrosting, low heating capacity, low energy efficiency of the system, more frequent defrosting and the like when the defrosting is performed and the reheating is performed; the function of stopping when reaching the set pressure can cause frequent stopping of the unit, thereby affecting the normal operation of the unit.
Disclosure of Invention
The invention provides a heat pump refrigeration anti-freezing method, a heat pump refrigeration anti-freezing device and a heat pump refrigeration control system, which are used for solving the technical problem that a heat exchanger is frosted when a heat pump unit runs or is lack of refrigerant because the unit cannot judge the evaporation temperature in the starting refrigeration process.
According to an aspect of the present invention, there is provided a heat pump refrigeration antifreeze method including:
in a refrigeration mode, detecting the temperature of the refrigeration coil at intervals of a preset first time interval;
the opening degree of the electronic expansion valve and the frequency of the compressor are respectively adjusted according to the temperature of the refrigeration coil;
if the temperature of the refrigeration coil is still smaller than the first preset temperature after the first time is continuously preset, the operation of the compressor is stopped, and a fault is reported.
Optionally, according to the
The refrigeration coil temperature adjusts the aperture of electronic expansion valve and compressor frequency respectively, includes:
if the temperature of the refrigeration coil is detected to be in a preset first temperature interval, the opening of the electronic expansion valve is not closed any more;
if the temperature of the refrigeration coil is detected to be in a preset second temperature interval, opening the electronic expansion valve by a preset first opening degree, and controlling the frequency of the compressor to be increased no longer;
if the temperature of the refrigeration coil is detected to be smaller than the first preset temperature, opening the electronic expansion valve by a preset second opening, and controlling the frequency of the compressor to rise no longer, wherein the temperature value in the preset first temperature interval is larger than the temperature value in the preset second temperature interval, and the temperature value in the preset second temperature interval is larger than the first preset temperature.
Optionally, in the cooling mode, detecting the temperature of the cooling coil at regular time includes:
the compressor is controlled to start a cooling mode and continue to operate for a preset second time.
Optionally, if the temperature of the refrigeration coil is still less than the first preset temperature after the first time is continuously preset, stopping the operation of the compressor and reporting a fault, and then further including:
and if the temperature of the refrigeration coil is detected to be more than or equal to the second preset temperature in the continuously preset third time, starting the compressor again.
Optionally, if the temperature of the refrigeration coil is greater than or equal to the second preset temperature within the preset third time is detected, the compressor is started again, and then the method further includes:
if the number of times of fault reporting in the preset fourth time is larger than the preset fault threshold value, stopping the operation of the compressor, and enabling the compressor not to restart.
According to another aspect of the present invention, there is provided a heat pump refrigeration antifreeze apparatus including:
the detection unit is used for detecting the temperature of the refrigerating coil at intervals of a preset first time interval in a refrigerating mode;
the first adjusting unit is used for adjusting the opening degree of the electronic expansion valve and the frequency of the compressor according to the temperature of the refrigeration coil;
and the reporting unit is used for stopping the operation of the compressor and reporting faults if the temperature of the refrigeration coil is still smaller than the first preset temperature after the temperature of the refrigeration coil is continuously preset for the first time.
Optionally, the first adjusting unit further includes:
the second adjusting unit is used for not closing the opening of the electronic expansion valve when detecting that the temperature of the refrigeration coil is in a preset first temperature interval;
the third adjusting unit is used for opening the opening of the electronic expansion valve by a preset first opening when the temperature of the refrigeration coil is detected to be in a preset second temperature interval, and the frequency of the compressor is not controlled to rise;
and the fourth adjusting unit is used for opening the opening of the electronic expansion valve by a preset second opening degree when the temperature of the refrigeration coil pipe is detected to be smaller than the first preset temperature, and the frequency of the compressor is not controlled to be increased.
Optionally, the method further comprises:
and the control unit is used for controlling the compressor to start the refrigeration mode and continuously operating for a preset second time.
Optionally, the method further comprises:
and the starting unit is used for restarting the compressor if the temperature of the refrigerating coil is higher than or equal to the second preset temperature within the continuously preset third time.
According to another aspect of the invention, there is provided a heat pump control system comprising a control module and a compressor connected to the control module, an electronic expansion valve and a refrigeration coil temperature detector;
the refrigerating coil temperature detector is used for detecting the temperature of the refrigerating coil;
the control module is used for executing a heat pump refrigeration anti-freezing method.
According to the invention, the opening degree of the electronic expansion valve and the frequency of the compressor are regulated by regularly monitoring the temperature of the refrigeration coil, so that the output temperature of the refrigerant is controlled, and the situation that the heat exchange plate is frozen and damaged due to long-time low temperature can be avoided; in addition, when the opening degree of the electronic expansion valve and the frequency of the compressor are controlled continuously for a plurality of times, and the temperature of the refrigeration coil is still smaller than the first preset temperature after the first time is preset continuously, the lack of the refrigerant or the damage of the heat exchanger is indicated, and at the moment, the fault needs to be reported and the operation of the compressor is stopped.
It should be understood that the description in this section is not intended to identify key or critical features of the embodiments of the invention or to delineate the scope of the invention. Other features of the present invention will become apparent from the description that follows.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flow chart of a heat pump refrigeration antifreeze method according to a first embodiment of the invention;
fig. 2 is a flow chart of a heat pump refrigeration anti-freezing method according to a second embodiment of the present invention;
FIG. 3 is a system configuration diagram of a heat pump unit used in accordance with a second embodiment of the present invention;
fig. 4 is a schematic structural diagram of a heat pump refrigeration antifreeze device according to a third embodiment of the present invention;
fig. 5 is a system architecture diagram of a heat pump control system according to a fourth embodiment of the present invention;
reference numerals: a compressor-1; a high voltage switch-2; a low voltage switch-3; a four-way valve-4; an evaporator-5; a fan-6; an electronic expansion valve-7; a probe-8 of a refrigerating coil; a heat exchanger-9; the control module-10, the refrigeration coil temperature detector-11.
Detailed Description
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Example 1
Fig. 1 is a flowchart of a heat pump refrigeration and antifreeze method according to an embodiment of the present invention, where the method may be performed by a heat pump refrigeration and antifreeze device, and the heat pump refrigeration and antifreeze device may be implemented in hardware and/or software, and the heat pump refrigeration and antifreeze device may be configured in a heat pump unit. As shown in fig. 1, the method includes:
101. in a refrigeration mode, detecting the temperature of the refrigeration coil at intervals of a preset first time interval;
when the heat pump unit is started in a refrigeration mode, the high-temperature and high-pressure refrigerant gas passes through the expansion valve and then outputs the low-temperature and low-pressure refrigerant to the refrigeration coil, so that the temperature of the refrigeration coil can be detected at intervals of a preset first time to monitor the temperature of the output refrigerant in real time, and corresponding regulation and control are performed according to the temperature of the refrigeration coil, so that the heat exchange plate is prevented from being frozen. Specifically, the preset first time interval may be set as required, for example, to 30 seconds or one minute.
102. The opening degree of the electronic expansion valve and the frequency of the compressor are respectively adjusted according to the temperature of the refrigeration coil;
in order to control the temperature of the refrigeration coil, the opening degree of the electronic expansion valve and the frequency of the compressor may be controlled to increase the temperature of the refrigerant supplied to the refrigeration coil. Wherein, the temperature of the output refrigerant can be reduced by opening the electronic expansion valve; the output quantity of the refrigerant can be controlled by controlling the frequency of the compressor.
103. If the temperature of the refrigeration coil is still smaller than the first preset temperature after the first time is continuously preset, the operation of the compressor is stopped, and a fault is reported.
When the opening of the electronic expansion valve and the frequency of the compressor are controlled continuously for a plurality of times, the temperature of the refrigeration coil is still smaller than the first preset temperature after the first time is preset, the lack of the refrigerant or the damage of the heat exchanger is indicated, and at the moment, the fault needs to be reported and the operation of the compressor is stopped. Specifically, the preset first time can be determined according to the number of times of controlling the opening degree of the electronic expansion valve and the frequency of the compressor, for example, the opening degree of the electronic expansion valve and the frequency of the compressor are controlled once every 10 seconds, and the fault can be reported when the temperature of the refrigeration coil is still continuously at the first preset temperature after 12 times of repetition. The first preset temperature may be set as desired, for example, at zero degrees celsius or 2 degrees celsius.
According to the invention, the opening degree of the electronic expansion valve and the frequency of the compressor are regulated by regularly monitoring the temperature of the refrigeration coil, so that the output temperature of the refrigerant is controlled, and the situation that the heat exchange plate is frozen and damaged due to long-time low temperature can be avoided; in addition, when the opening degree of the electronic expansion valve and the frequency of the compressor are controlled continuously for a plurality of times, and the temperature of the refrigeration coil is still smaller than the first preset temperature after the first time is preset continuously, the lack of the refrigerant or the damage of the heat exchanger is indicated, and at the moment, the fault needs to be reported and the operation of the compressor is stopped.
Example two
Fig. 2 is a flow chart of a heat pump refrigeration anti-freezing method provided in the second embodiment of the invention. As shown in fig. 2, the method includes:
201. controlling the compressor to start a refrigeration mode and continuously operating for a preset second time;
after the cooling mode is started, the compressor can be stably operated for a period of time, and after the heat pump unit is stable in operation, the temperature in the cooling coil tends to be stable, so that the temperature of the cooling coil can be collected. Specifically, the preset second time may be at least 2 minutes, and may be set to 3-5 minutes in practice.
202. In a refrigeration mode, detecting the temperature of the refrigeration coil at intervals of a preset first time interval;
when the heat pump unit is started in a refrigeration mode, the high-temperature and high-pressure refrigerant gas passes through the expansion valve and then outputs the low-temperature and low-pressure refrigerant to the refrigeration coil, so that the temperature of the refrigeration coil can be detected at intervals of a preset first time to monitor the temperature of the output refrigerant in real time, and corresponding regulation and control are performed according to the temperature of the refrigeration coil, so that the heat exchange plate is prevented from being frozen. Specifically, the preset first time interval may be set as needed, for example, 10 seconds, 20 seconds, or 30 seconds.
203. If the temperature of the refrigeration coil is detected to be in the preset first temperature interval, the opening of the electronic expansion valve is not closed any more;
it should be noted that, the temperature value in the preset first temperature interval is greater than the temperature value in the preset second temperature interval, and the temperature value in the preset second temperature interval is greater than the first preset temperature. The preset first temperature interval can be set to be (3, 5) DEG C, the preset second temperature interval can be set to be (2, 3) DEG C, and the first preset temperature is set to be 2℃.
204. If the temperature of the refrigeration coil is detected to be in a preset second temperature interval, opening the electronic expansion valve by a preset first opening, and controlling the frequency of the compressor to be increased no longer;
because the preset first temperature interval is the tolerance threshold value of the refrigeration coil, and the temperature value in the preset second temperature interval is smaller than the temperature value in the preset first temperature interval, when the temperature of the refrigeration coil is detected to be in the preset second temperature interval, the opening of the electronic expansion valve can be controlled to be larger than the preset first opening on the one hand, so that the temperature of the refrigerant input into the refrigeration coil is increased, the refrigeration coil is prevented from being frozen, the frequency of the compressor is not controlled to be increased, excessive refrigerant gas is prevented from being generated into the evaporator, and the refrigerant flows into the refrigeration coil through the electronic expansion valve after heat exchange in the evaporator.
After the preset first time interval, if the temperature of the refrigeration coil is still in the preset second temperature interval, the opening of the electronic expansion valve is continuously opened by a preset first opening, and the frequency of the compressor is not controlled to be increased. The invention can detect the temperature of the refrigeration coil pipe once every a first time interval, and control the electronic expansion valve and the compressor once according to the detected temperature of the refrigeration coil pipe. It should be noted that, the preset first opening may be set to 5P, that is, each time the temperature of the refrigeration coil is in the preset second temperature interval, the opening of the electronic expansion valve may be opened by 5P, and the specific preset first opening may be set according to the actual requirement. In addition, the maximum opening degree of the electronic expansion valve is 480P, that is, when the opening degree of the electronic expansion valve is 480P, the electronic expansion valve is not opened any more.
205. If the temperature of the refrigeration coil is detected to be smaller than the first preset temperature, opening the electronic expansion valve by a preset second opening degree, and controlling the frequency of the compressor to be increased no longer;
since the preset first temperature interval is already the tolerance threshold of the refrigeration coil, and the temperature value in the preset second temperature interval is smaller than the temperature value in the preset first temperature interval, and the temperature value in the preset second temperature interval is larger than the first preset temperature, when the refrigeration coil temperature is detected to be smaller than the first preset temperature, the opening of the electronic expansion valve needs to be further opened, for example, the preset second opening can be set to be 10P, that is, the opening of the electronic expansion valve can be opened by 10P every time the refrigeration coil temperature is smaller than the first preset temperature, and the frequency of the compressor is not controlled to be increased any more. Specifically, the preset second opening degree can be set according to actual requirements.
After the first time interval is preset, if the temperature of the refrigeration coil is detected to be still smaller than the first preset temperature, the opening of the electronic expansion valve is continuously opened by a preset second opening, and the frequency of the compressor is not controlled to be increased. If the temperature of the refrigeration coil is less than the first preset temperature after multiple times of measurement, namely the refrigeration bystander temperature is below the first preset temperature for a long time, the fault of the heat pump unit is indicated.
206. If the temperature of the refrigeration coil is still smaller than the first preset temperature after the first time is continuously preset, stopping the operation of the compressor and reporting a fault;
and the temperature of the refrigeration coil pipe is measured for a plurality of times to be smaller than the first preset temperature, namely the refrigeration bystander temperature is lower than the first preset temperature for a long time, so that the heat pump unit is proved to have faults. That is, when the temperature of the refrigeration coil is still lower than the first preset temperature after the first time is continuously preset, the operation of the compressor can be stopped, and a fault is reported. The preset first time may be set to a multiple of the preset first time interval, for example, if the preset first time interval is 10 seconds, the preset first time may be set to 120 seconds or 160 seconds, which may be set according to empirical data. Specific causes of failure may be lack of refrigerant or damage to the heat exchanger plates.
In a specific embodiment, the heat pump unit may be turned on again when the temperature of the refrigeration coil is detected to remain greater than the third preset temperature for the second time. For example, the heat pump unit may be turned on again when the temperature of the refrigeration coil is detected to be greater than 8 degrees celsius for 60 seconds.
207. If the number of times of fault reporting in the preset fourth time is larger than the preset fault threshold value, stopping the operation of the compressor, and enabling the compressor not to restart.
When the number of times of fault reporting in the preset fourth time is larger than the preset fault threshold, namely the user fails to repair the fault in time in the preset fourth time, the operation of the compressor can be stopped, and the compressor is not restarted any more. At this time, the compressor can be started again only after the user turns off the power supply and then turns on the heat pump system again. The preset fourth time may be set to 30 minutes or one hour, or other values greater than or equal to 30 minutes. The preset fault threshold may be set to 2 or 3 times, or other values greater than 2 times.
In a specific embodiment, if the temperature of the refrigeration coil is greater than the tolerance threshold of the refrigeration coil, for example, the temperature of the refrigeration coil is greater than 5 degrees celsius, the heat pump unit operates normally at this time, and the compressor frequency and the electronic expansion valve opening may not be adjusted.
In a specific embodiment, a schematic structural diagram of the heat pump unit of the present invention is shown in fig. 3, and fig. 3 includes:
the compressor 1 is respectively communicated with a first communication port and a second communication port of the four-way valve 4 of the high-pressure output port and the low-pressure output port of the compressor 1, a third output port of the four-way valve 4 is communicated with an input port of the evaporator 5, the fan 6 is correspondingly arranged with the evaporator 5, the output port of the evaporator 5 is communicated with one end of the electronic expansion valve 7, the other end of the electronic expansion valve 7 is communicated with a refrigerating coil in the heat exchanger 9, and one end of the refrigerating coil is provided with a refrigerating coil probe 8; the output port of the heat exchanger 9 is communicated with the fourth communication port of the four-way valve 4; the high-voltage switch 2 is adopted to control the on-off of the high-voltage output port, and the low-voltage switch 3 is adopted to control the on-off of the low-voltage output port.
After the low-temperature low-pressure refrigerant enters the compressor, the low-temperature low-pressure refrigerant is compressed into high-temperature high-pressure gas by the compressor, the high-temperature high-pressure gas flows into the evaporator through the four-way valve, the high-temperature high-pressure refrigerant gas exchanges heat with wind blown by the fan in the evaporator, then medium-temperature high-pressure refrigerant steam outputs high-speed low-temperature low-pressure refrigerant through the electronic expansion valve to enter the heat exchanger, the refrigerant is condensed into a gas-liquid mixture in the heat exchanger, and the refrigerant of the gas-liquid mixture flows into the compressor again through the four-way valve, so that the circulation of the refrigerant in the heat pump unit is completed.
According to the invention, the temperature of the refrigerating coil is collected at fixed time, and a plurality of temperature intervals are set, and the frequency of the compressor and the opening of the expansion valve are regulated according to the temperature interval of the refrigerating coil, so that the situation that the heat exchange plate is frozen and damaged due to long-time low temperature can be avoided; in addition, when the opening degree of the electronic expansion valve and the frequency of the compressor are controlled continuously for a plurality of times, and the temperature of the refrigeration coil is still smaller than the first preset temperature after the first time is preset continuously, the lack of the refrigerant or the damage of the heat exchanger is indicated, and at the moment, the fault needs to be reported and the operation of the compressor is stopped.
Example III
Fig. 4 is a schematic structural diagram of a heat pump refrigeration anti-freezing device according to a third embodiment of the present invention. As shown in fig. 4, the apparatus includes:
a detecting unit 301, configured to detect a temperature of the refrigeration coil at intervals of a preset first time interval in the refrigeration mode;
a first adjusting unit 302, configured to adjust an opening degree of the electronic expansion valve and a compressor frequency according to a temperature of the refrigeration coil;
and the reporting unit 303 is configured to stop the operation of the compressor and report a fault if the temperature of the refrigeration coil is still less than the first preset temperature after the temperature of the refrigeration coil is continuously preset for the first time.
In a specific embodiment, the method further comprises:
and the control unit is used for controlling the compressor to start the refrigeration mode and continuously operating for a preset second time.
In a specific embodiment, the method further comprises:
and the starting unit is used for restarting the compressor if the temperature of the refrigerating coil is higher than or equal to the second preset temperature within the continuously preset third time.
The heat pump refrigeration anti-freezing device provided by the embodiment of the invention can execute the heat pump refrigeration anti-freezing method provided by any embodiment of the invention, and has the corresponding functional modules and beneficial effects of the execution method.
Example IV
Fig. 5 shows a schematic diagram of a heat pump control system that may be used to implement an embodiment of the invention. The heat pump control system comprises a control module 10, a compressor 1 connected with the control module 10, an electronic expansion valve 7 and a refrigeration coil temperature detector 11;
the refrigeration coil temperature detector 11 is used for detecting the temperature of the refrigeration coil;
the control module 10 is used for executing a heat pump refrigeration anti-freezing method provided by any embodiment of the invention.
Wherein the control module 10 comprises a processor and a memory, such as a Read Only Memory (ROM), a Random Access Memory (RAM), etc., communicatively coupled to the processor, wherein the memory stores a computer program executable by at least one control module, the control module may perform various suitable actions and processes in accordance with the computer program stored in the Read Only Memory (ROM) or the computer program loaded from a storage unit into the Random Access Memory (RAM). In the RAM, various programs and data required for the operation of the control module may also be stored.
The processor may be a variety of general and/or special purpose processing components with processing and computing capabilities. Some examples of processors include, but are not limited to, central processing units, various specialized Artificial Intelligence (AI) computing chips, various processors running machine learning model algorithms, digital Signal Processors (DSPs), and any suitable processors, controllers, microcontrollers, etc. The processor performs the heat pump refrigeration freeze protection method described above.
In addition, the compressor 1 may be a rotor compressor for compressing the refrigerant into high-temperature and high-pressure gas, and then inputting the gas into the evaporator 5, and the refrigerant may complete heat exchange in the evaporator 5, and the compressor 1 may be directly controlled by the control module 10.
The opening degree of the electronic expansion valve 7 can be controlled by the control module 10, and the temperature of the liquid-liquid mixed state refrigerant entering the refrigeration coil is controlled by controlling the opening degree of the electronic expansion valve 7.
A refrigeration coil temperature sensor 11 may be provided on the refrigeration coil probe 8 to directly measure the temperature of the refrigeration coil and to in fact report the temperature to the control module 10 to function as a monitoring for the refrigeration coil temperature.
It should be appreciated that various forms of the flows shown above may be used to reorder, add, or delete steps. For example, the steps described in the present invention may be performed in parallel, sequentially, or in a different order, so long as the desired results of the technical solution of the present invention are achieved, and the present invention is not limited herein.
The above embodiments do not limit the scope of the present invention. It will be apparent to those skilled in the art that various modifications, combinations, sub-combinations and alternatives are possible, depending on design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of the present invention.
Claims (8)
1. A heat pump refrigeration antifreeze method, comprising:
in a refrigeration mode, detecting the temperature of the refrigeration coil at intervals of a preset first time interval;
the opening degree of the electronic expansion valve and the frequency of the compressor are respectively adjusted according to the temperature of the refrigeration coil;
if the temperature of the refrigeration coil is still smaller than the first preset temperature after the first time is continuously preset, stopping the operation of the compressor and reporting a fault;
the method for adjusting the opening degree of the electronic expansion valve and the frequency of the compressor according to the temperature of the refrigeration coil pipe comprises the following steps:
if the temperature of the refrigeration coil is detected to be in a preset first temperature interval, the opening of the electronic expansion valve is not closed any more;
if the temperature of the refrigeration coil is detected to be in a preset second temperature interval, opening the electronic expansion valve by a preset first opening degree, and controlling the frequency of the compressor to be increased no longer;
if the temperature of the refrigeration coil is detected to be smaller than the first preset temperature, opening the electronic expansion valve by a preset second opening, and controlling the frequency of the compressor to rise no longer, wherein the temperature value in the preset first temperature interval is larger than the temperature value in the preset second temperature interval, and the temperature value in the preset second temperature interval is larger than the first preset temperature.
2. The heat pump refrigeration antifreeze method of claim 1, wherein in said refrigeration mode, the timed detection of refrigeration coil temperature, previously comprises:
the compressor is controlled to start a cooling mode and continue to operate for a preset second time.
3. The heat pump refrigeration antifreeze method of claim 1, wherein if said refrigerant coil temperature remains less than a first preset temperature after a first time period, stopping compressor operation and reporting a fault, further comprising:
and if the temperature of the refrigeration coil is detected to be more than or equal to the second preset temperature in the continuously preset third time, starting the compressor again.
4. The heat pump refrigeration antifreeze method of claim 3, wherein if said continuous preset third time is detected, said refrigerant coil temperature is greater than or equal to a second preset temperature, and then the compressor is restarted, further comprising:
if the number of times of fault reporting in the preset fourth time is larger than the preset fault threshold value, stopping the operation of the compressor, and enabling the compressor not to restart.
5. A heat pump refrigeration antifreeze apparatus, comprising:
the detection unit is used for detecting the temperature of the refrigerating coil at intervals of a preset first time interval in a refrigerating mode;
the first adjusting unit is used for adjusting the opening degree of the electronic expansion valve and the frequency of the compressor according to the temperature of the refrigeration coil;
the reporting unit is used for stopping the operation of the compressor and reporting faults if the temperature of the refrigeration coil is still smaller than the first preset temperature after the temperature of the refrigeration coil is continuously preset for the first time;
wherein the first adjusting unit further comprises:
the second adjusting unit is used for not closing the opening of the electronic expansion valve when detecting that the temperature of the refrigeration coil is in a preset first temperature interval;
the third adjusting unit is used for opening the opening of the electronic expansion valve by a preset first opening when the temperature of the refrigeration coil is detected to be in a preset second temperature interval, and the frequency of the compressor is not controlled to rise;
and the fourth adjusting unit is used for opening the opening of the electronic expansion valve by a preset second opening degree when the temperature of the refrigeration coil pipe is detected to be smaller than the first preset temperature, and the frequency of the compressor is not controlled to be increased.
6. The heat pump refrigeration antifreeze apparatus of claim 5, further comprising:
and the control unit is used for controlling the compressor to start the refrigeration mode and continuously operating for a preset second time.
7. The heat pump refrigeration antifreeze apparatus of claim 5, further comprising:
and the starting unit is used for restarting the compressor if the temperature of the refrigerating coil is higher than or equal to the second preset temperature within the continuously preset third time.
8. The heat pump control system is characterized by comprising a control module, a compressor, an electronic expansion valve and a refrigeration coil temperature detector, wherein the compressor, the electronic expansion valve and the refrigeration coil temperature detector are connected with the control module;
the refrigerating coil temperature detector is used for detecting the temperature of the refrigerating coil;
the control module is used for executing the heat pump refrigeration anti-freezing method of any one of claims 1-4.
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