CN117739438B - Air-cooled heat pump control system and control method - Google Patents
Air-cooled heat pump control system and control method Download PDFInfo
- Publication number
- CN117739438B CN117739438B CN202311737039.7A CN202311737039A CN117739438B CN 117739438 B CN117739438 B CN 117739438B CN 202311737039 A CN202311737039 A CN 202311737039A CN 117739438 B CN117739438 B CN 117739438B
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- defrosting
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- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000007405 data analysis Methods 0.000 claims abstract description 15
- 238000010257 thawing Methods 0.000 claims description 78
- 238000001514 detection method Methods 0.000 claims description 21
- 238000010438 heat treatment Methods 0.000 claims description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- 238000006243 chemical reaction Methods 0.000 claims description 9
- 238000004891 communication Methods 0.000 claims description 6
- 239000010725 compressor oil Substances 0.000 claims description 3
- 230000000694 effects Effects 0.000 description 6
- 238000004378 air conditioning Methods 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 230000002411 adverse Effects 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 238000005057 refrigeration Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 239000006096 absorbing agent Substances 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000003507 refrigerant Substances 0.000 description 1
Classifications
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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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- Defrosting Systems (AREA)
Abstract
The invention relates to the technical field of air-cooled heat pumps, and discloses an air-cooled heat pump control system and a control method, wherein the air-cooled heat pump control system comprises a data acquisition module and an air-cooled heat pump unit, the data acquisition module is electrically connected with a data analysis module, the data analysis module is electrically connected with the air-cooled heat pump unit, and the unit module unit comprises: the four-way reversing valve is connected with a condenser through a pipeline, the condenser is connected with an electronic expansion valve through a pipeline, one end of the electronic expansion valve is connected with a fin evaporator through a pipeline.
Description
Technical Field
The invention relates to the technical field of air-cooled heat pumps, in particular to an air-cooled heat pump control system and a control method.
Background
The air-cooled heat pump is an air-conditioning unit different from an air-cooled water chilling unit in the air-conditioning industry, the equipment operates based on a compression refrigeration cycle principle, a refrigerant is used as a carrier, heat is extracted from the atmosphere through forced heat exchange of a fan, and then the heat is transferred to a space or equipment to be heated.
Specifically, the air-cooled heat pump unit is a circulation system formed by a compressor, a heat exchanger, a throttle, a heat absorber and other devices. Besides the function of preparing cold water, the air-cooled heat pump unit can be switched to a heating working condition to prepare hot water, so that the functions of refrigerating in summer and heating in winter are realized.
The biggest problem encountered by an air-cooled heat pump during heating operation in winter is that the surface of an evaporator is frosted, and the heat transfer resistance between the surface of the evaporator and air is increased due to the formation and growth of frost, so that the flow resistance of air flow passing through the evaporator is increased, the working node of a fan is changed, the air flow passing through the evaporator is reduced, and the heat transfer quantity from the air to the evaporator is reduced. The operation condition of the heat pump unit is deteriorated so that it cannot be operated normally. Therefore, the air-cooled heat pump needs to defrost timely when running under the frosting condition.
The application provides an air-cooled heat pump control system and a control method, which are used for realizing efficient and smooth defrosting of an air-cooled heat pump.
Disclosure of Invention
The invention aims to provide an air-cooled heat pump control system and a control method, which are used for solving the problems in the background technology.
In order to achieve the above purpose, the present invention provides the following technical solutions: the utility model provides an air-cooled heat pump control system, includes data acquisition module and air-cooled heat pump unit, data acquisition module electric connection has data analysis module, data analysis module electric connection has air-cooled heat pump unit, air-cooled heat pump unit includes the compressor, the compressor passes through the pipe connection and has unit module unit, unit module unit has a plurality of, unit module unit includes: the four-way reversing valve is connected with a condenser through a pipeline, the condenser is connected with an electronic expansion valve through a pipeline, and one end of the electronic expansion valve is connected with a fin evaporator through a pipeline.
Preferably, the data acquisition module includes: a temperature sensor and a frost layer sensor, the temperature sensor including an ambient temperature sensor for detecting an ambient temperature and a fin temperature sensor for detecting a fin temperature.
Preferably, the frost layer sensor is any one of a capacitance detector for detecting a dielectric constant outside the coil of the fin evaporator or an acoustic oscillator for detecting a resonance frequency of the fin evaporator.
Preferably, the data analysis module comprises a control main board, the data analysis module is electrically connected with a data output module, the data output module comprises a bus, the bus is electrically connected with an interface and level conversion, the interface is electrically connected with remote control output, the level conversion is provided with a plurality of, and the level conversion is electrically connected with an Ethernet port, an RS-232 communication port and an RS-486 communication port.
Preferably, the air-cooled heat pump unit further comprises a mode operation module, a load control module, a system protection module and a backup memory module.
Preferably, the mode operation module comprises a refrigeration mode, a heating mode and a defrosting mode, the load control module is used for controlling electronic components of the air-cooled heat pump, the load control module comprises a compressor control, a four-way reversing valve control, an air-conditioner circulating water pump control, an external fan control and a motor heat control, the system protection module is used for protecting a system when the system fails, and the backup memory module is used for memorizing the set operation mode and parameters of the system.
An air-cooled heat pump control method comprises an air-cooled heat pump control system.
An air-cooled heat pump control method comprises the following steps:
s1: selecting a defrost mode;
s2: the air-cooled heat pump control system enters defrosting condition judgment;
S3: when the defrosting condition is met, the fan stops running, and the four-way reversing valve is electrified for reversing;
S4: then, low-pressure, high-pressure and compressor oil pressure difference protection delay detection is carried out on the defrosting state equipment;
S5: after detecting normal in S4, detecting the protection of the compressor and the water flow switch;
S6: after the detection in S5 is normal; a defrosting mode operation;
s7: then judging the defrosting end condition;
s8: after the defrosting end condition is met, fault detection and defrosting mode termination countdown start;
S9: when the fault detection is normal, after the defrosting mode is finished and the countdown is finished, the four-way reversing valve is powered off, the fan is started, and the running time of the compressor is cleared;
s10: and after defrosting is finished, entering a normal heating state.
Preferably, when the defrosting condition is judged in the step S2, the air-cooled heat pump unit (2) normally enters a heating state when the defrosting condition is not satisfied, the air-cooled heat pump unit (2) displays faults and stops when the detection result in the step S4 exceeds the safety parameter range, the air-cooled heat pump unit displays faults and stops when the detection result in the step S5 fails, and the air-cooled heat pump unit displays faults and stops when the fault detection result in the step S8 fails.
Preferably, when the defrosting condition is judged in S2, it is required to simultaneously satisfy that the fin temperature of the fin evaporator is less than the set value, the defrosting time interval is greater than the set value, the operation time of the compressor is greater than the set value, the ambient temperature is less than the defrosting ambient temperature set value and is maintained for a period of time, and the unit module units entering defrosting simultaneously are less than or equal to two; s7, when the defrosting end condition is judged, any condition that the temperature of the fin is larger than a set value, the defrosting time is larger than the set value and the start and stop times of the fan reach the set value is required to be met.
Compared with the prior art, the invention has the beneficial effects that:
According to the invention, each fin evaporator and each condenser of the air-cooled heat pump control system are made into an independent unit module unit, the defrosting speed of the air-cooled heat pump control system is higher, the operation is stable, the water temperature cannot fluctuate due to defrosting, the electronic expansion valve is independently regulated according to the corresponding evaporator, the heating and evaporating effects are better, the refrigerating and condensing effects are stable, in addition, when the defrosting control is carried out, after the defrosting mode is started, the judgment of the defrosting mode is firstly carried out, the starting of the defrosting mode is controlled by the common limitation of the ambient temperature, the fin temperature, the defrosting quantity of the unit module units, the operation time of the compressor and the defrosting interval time, and meanwhile, the defrosting mode is judged to be ended by the defrosting ending condition, so that the adaptability of the air-cooled heat pump unit to various working conditions is improved, the problems of reducing the operation efficiency of the unit, increasing the pressure impact generated by the back and forth change of the working state of the unit and the action of the four-way reversing valve at the moment, and adverse effects on the reliability of the unit are avoided.
Drawings
FIG. 1 is a diagram showing an electrical connection relationship of an air-cooled heat pump control system according to the present invention;
FIG. 2 is a diagram showing the connection of air cooling and heating pump units in an air cooling heat pump control system;
fig. 3 is a flow chart of a control method of an air-cooled heat pump according to the present invention.
In the figure: 1-a data acquisition module; 101-a temperature sensor; 102-frost layer sensor; 2-an air-cooled heat pump unit; 201-a compressor; 20-a four-way reversing valve; 203-a condenser; 204-an electronic expansion valve; 205-fin evaporator; 3-a data analysis module; 4-a data output module; 401-bus; 402-interface; 403-level shifting; 404-remote control output.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments.
Embodiment one: referring to fig. 1 and 2, the present invention provides a technical solution: the utility model provides an air-cooled heat pump control system, includes data acquisition module 1 and air-cooled heat pump unit 2, data acquisition module 1 electric connection has data analysis module 3, data analysis module 3 electric connection has air-cooled heat pump unit 2, air-cooled heat pump unit 2 includes compressor 201, the compressor passes through the pipe connection and has unit module unit, unit module unit has a plurality of, unit module unit includes: the four-way reversing valve 202 is connected with a condenser 203 through a pipeline, the condenser 203 is connected with an electronic expansion valve 204 through a pipeline, and one end of the electronic expansion valve 204 is connected with a fin evaporator 205 through a pipeline.
The data acquisition module 1 includes: a temperature sensor 101 and a frost layer sensor 102, the temperature sensor including an ambient temperature sensor for detecting an ambient temperature and a fin temperature sensor for detecting a fin temperature.
The frost sensor 102 is any one of a capacitance detector or a sound oscillator, the capacitance detector is used for detecting the dielectric constant of the outer side of the coil pipe of the fin evaporator, a pair of capacitance detectors are arranged on the coil pipe, and when the dielectric constant of the frost layer is changed, a circuit changes the signal into a defrosting trigger signal; the method can assist in judging whether the defrosting mode is started or not, and prevent erroneous judgment.
The acoustic oscillator is used for detecting resonance frequency of the fin evaporator. Along with the accumulation of the frost layer, the resonance frequency can be changed obviously, and the thickness of the frost layer is deduced by monitoring the resonance frequency of an acoustic oscillator arranged in the evaporator so as to control the defrosting action, and the judgment of whether the defrosting mode is started or not can be assisted, so that the erroneous judgment is prevented.
The data analysis module 3 comprises a control main board, the data analysis module 3 is electrically connected with a data output module 4, the data output module 4 comprises a bus 401, the bus 401 is electrically connected with an interface 402 and level conversion 403, the interface 402 is electrically connected with remote control output 404, the level conversion 403 is provided with a plurality of levels, and the level conversion 403 is electrically connected with an Ethernet port, an RS-232 communication port and an RS-486 communication port.
The air-cooled heat pump unit 2 further comprises a mode operation module, a load control module, a system protection module and a backup memory module.
The mode operation module includes a cooling mode, a heating mode and a defrosting mode,
The load control module is used for controlling electronic components of the air-cooled heat pump and comprises compressor control, four-way reversing valve control, air-conditioning circulating water pump control, external fan control and motor heat control,
The system protection module is used for protecting the system when the system fails,
The backup memory module is used for memorizing the set operation mode and parameters by the system.
Embodiment two: referring to fig. 1, 2 and 3, the present invention provides a technical solution: an air-cooled heat pump control method comprises an air-cooled heat pump control system. An air-cooled heat pump control method comprises the following steps:
s1: selecting a defrost mode;
s2: the air-cooled heat pump control system enters defrosting condition judgment;
S3: when the defrosting condition is met, the fan stops running, and the four-way reversing valve is electrified for reversing;
S4: then, low-pressure, high-pressure and compressor oil pressure difference protection delay detection is carried out on the defrosting state equipment;
S5: after detecting normal in S4, detecting the protection of the compressor and the water flow switch;
S6: after the detection in S5 is normal; a defrosting mode operation;
s7: then judging the defrosting end condition;
s8: after the defrosting end condition is met, fault detection and defrosting mode termination countdown start;
S9: when the fault detection is normal, after the defrosting mode is finished and the countdown is finished, the four-way reversing valve is powered off, the fan is started, and the running time of the compressor is cleared;
s10: and after defrosting is finished, entering a normal heating state.
When the defrosting condition is judged in S2, the air-cooled heat pump unit 2 normally enters a heating state when the defrosting condition is not met, the air-cooled heat pump unit 2 displays faults and stops when the detection result in S4 exceeds the safety parameter range, the air-cooled heat pump unit 2 displays faults and stops when the detection result in S5 fails, and the air-cooled heat pump unit 2 displays faults and stops when the detection result of the faults in S8 fails.
When the defrosting condition judgment is performed in the S2, the requirement that the fin temperature of the fin evaporator 205 is smaller than a set value, the defrosting time interval is larger than the set value, the running time of the compressor is larger than the set value, the environment temperature is smaller than the defrosting environment temperature set value and is kept for a period of time, and unit module units entering defrosting simultaneously are smaller than or equal to two; s7, when the defrosting end condition is judged, any condition that the temperature of the fin is larger than a set value, the defrosting time is larger than the set value and the start and stop times of the fan reach the set value is required to be met.
According to the invention, each fin evaporator and each condenser of the air-cooled heat pump control system are made into an independent unit module unit, the defrosting speed of the air-cooled heat pump control system is higher, the operation is stable, the water temperature cannot fluctuate due to defrosting, the electronic expansion valve is independently regulated according to the corresponding evaporator, the heating and evaporating effects are better, the refrigerating and condensing effects are stable, in addition, when the defrosting control is carried out, after the defrosting mode is started, the judgment of the defrosting mode is firstly carried out, the starting of the defrosting mode is controlled by the common limitation of the ambient temperature, the fin temperature, the defrosting quantity of the unit module units, the operation time of the compressor and the defrosting interval time, and meanwhile, the defrosting mode is judged to be ended by the defrosting ending condition, so that the adaptability of the air-cooled heat pump unit to various working conditions is improved, the problems of reducing the operation efficiency of the unit, increasing the pressure impact generated by the back and forth change of the working state of the unit and the action of the four-way reversing valve at the moment, and adverse effects on the reliability of the unit are avoided.
All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Claims (7)
1. The air-cooled heat pump control method is applied to an air-cooled heat pump control system, and the air-cooled heat pump control system comprises a data acquisition module (1) and an air-cooled heat pump unit (2), and is characterized in that: the data acquisition module (1) is electrically connected with the data analysis module (3), the data analysis module (3) is electrically connected with the air-cooled heat pump unit (2), the air-cooled heat pump unit (2) comprises a compressor (201), the compressor is connected with an organic unit module unit through a pipeline, the unit module unit is provided with a plurality of units, and the unit module unit comprises: the four-way reversing valve (202) is connected with a condenser (203) through a pipeline, the condenser (203) is connected with an electronic expansion valve (204) through a pipeline, and one end of the electronic expansion valve (204) is connected with a fin evaporator (205) through a pipeline;
The air-cooled heat pump control method comprises the following steps:
s1: selecting a defrost mode;
s2: the air-cooled heat pump control system enters defrosting condition judgment;
S3: when the defrosting condition is met, the fan stops running, and the four-way reversing valve is electrified for reversing;
S4: then, low-pressure, high-pressure and compressor oil pressure difference protection delay detection is carried out on the defrosting state equipment;
S5: after detecting normal in S4, detecting the protection of the compressor and the water flow switch;
S6: after the detection in S5 is normal; a defrosting mode operation;
s7: then judging the defrosting end condition;
s8: after the defrosting end condition is met, fault detection and defrosting mode termination countdown start;
S9: when the fault detection is normal, after the defrosting mode is finished and the countdown is finished, the four-way reversing valve is powered off, the fan is started, and the running time of the compressor is cleared;
s10: after defrosting is finished, entering a normal heating state;
When the defrosting condition judgment is carried out in the S2, the condition that the fin temperature of the fin evaporator (205) is smaller than a set value, the defrosting time interval is larger than the set value, the running time of the compressor is larger than the set value, the environment temperature is smaller than the defrosting environment temperature set value and is kept for a period of time, and unit module units entering defrosting simultaneously are smaller than or equal to two; s7, when the defrosting end condition is judged, any condition that the temperature of the fin is larger than a set value, the defrosting time is larger than the set value and the start and stop times of the fan reach the set value is required to be met.
2. The air-cooled heat pump control method according to claim 1, characterized in that: the data acquisition module (1) comprises: a temperature sensor (101) and a frost layer sensor (102), the temperature sensor comprising an ambient temperature sensor for detecting an ambient temperature and a fin temperature sensor for detecting a fin temperature.
3. The air-cooled heat pump control method according to claim 2, characterized in that: the frost sensor (102) is any one of a capacitance detector for detecting a dielectric constant outside the coil of the fin evaporator or an acoustic oscillator for detecting resonance frequency of the fin evaporator.
4. The air-cooled heat pump control method according to claim 1, characterized in that: the data analysis module (3) comprises a control main board, the data analysis module (3) is electrically connected with a data output module (4), the data output module (4) comprises a bus (401), the bus (401) is electrically connected with an interface (402) and level conversion (403), the interface (402) is electrically connected with remote control output (404), the level conversion (403) is provided with a plurality of, and the level conversion (403) is electrically connected with an Ethernet port, an RS-232 communication port and an RS-486 communication port.
5. The air-cooled heat pump control method as claimed in claim 4, wherein: the air-cooled heat pump unit (2) further comprises a mode operation module, a load control module, a system protection module and a backup memory module.
6. The air-cooled heat pump control method according to claim 5, wherein: the system protection module is used for protecting the system when the system fails, and the backup memory module is used for memorizing the set operation modes and parameters of the system.
7. The air-cooled heat pump control method according to claim 1, characterized in that: when the defrosting condition is judged in S2, the air-cooled heat pump unit (2) normally enters a heating state when the defrosting condition is not met, when the detection result in S4 exceeds the safety parameter range, the air-cooled heat pump unit (2) displays faults and stops, when the detection result in S5 fails, the air-cooled heat pump unit (2) displays faults and stops, and when the fault detection result in S8 fails, the air-cooled heat pump unit (2) displays faults and stops.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311737039.7A CN117739438B (en) | 2023-12-18 | 2023-12-18 | Air-cooled heat pump control system and control method |
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| CN202311737039.7A CN117739438B (en) | 2023-12-18 | 2023-12-18 | Air-cooled heat pump control system and control method |
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| CN117739438A CN117739438A (en) | 2024-03-22 |
| CN117739438B true CN117739438B (en) | 2024-06-11 |
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| CN117739438A (en) | 2024-03-22 |
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