CN111928339A - Outdoor unit heat exchanger, control method and control unit thereof and air conditioning system - Google Patents
Outdoor unit heat exchanger, control method and control unit thereof and air conditioning system Download PDFInfo
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- CN111928339A CN111928339A CN202010960743.9A CN202010960743A CN111928339A CN 111928339 A CN111928339 A CN 111928339A CN 202010960743 A CN202010960743 A CN 202010960743A CN 111928339 A CN111928339 A CN 111928339A
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- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000004378 air conditioning Methods 0.000 title claims abstract description 16
- 239000007788 liquid Substances 0.000 claims description 32
- 238000004590 computer program Methods 0.000 claims description 11
- 238000003860 storage Methods 0.000 claims description 7
- 238000010257 thawing Methods 0.000 abstract description 40
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 6
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 16
- 230000008569 process Effects 0.000 description 10
- 230000003247 decreasing effect Effects 0.000 description 6
- 230000006870 function Effects 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 239000003507 refrigerant Substances 0.000 description 3
- 238000009826 distribution Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000004781 supercooling Methods 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
- F24F1/0003—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station characterised by a split arrangement, wherein parts of the air-conditioning system, e.g. evaporator and condenser, are in separately located units
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
- F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
- F24F1/14—Heat exchangers specially adapted for separate outdoor units
- F24F1/16—Arrangement or mounting thereof
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/88—Electrical aspects, e.g. circuits
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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
- 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
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
- F24F2110/12—Temperature of the outside air
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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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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Signal Processing (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The disclosure provides an external unit heat exchanger, a control method and a control unit thereof and an air conditioning system, and relates to the field of heat exchange. The outer machine heat exchanger includes: the outer machine inner row micro-channel heat exchanger and the outer machine outer row micro-channel heat exchanger are vertically arranged; an opening-controllable outer machine inner row electronic expansion valve is arranged at an outlet of the outer machine inner row micro-channel heat exchanger; and the opening-controllable outer-unit outer-discharge electronic expansion valve is arranged at the outlet of the outer-unit outer-discharge micro-channel heat exchanger. The opening degrees of the inner/outer row expansion valves are respectively controlled, and the flow rates of the inner/outer row heat exchangers are respectively adjusted, so that different defrosting degree control can be performed according to different frosting degrees of the inner/outer row heat exchangers, and the inner/outer row heat exchangers are vertically arranged, thereby being beneficial to the discharge of defrosting water and improving the defrosting efficiency.
Description
Technical Field
The disclosure relates to the field of heat exchange, and in particular relates to an external unit heat exchanger, a control method and a control unit thereof, and an air conditioning system.
Background
The micro-channel heat exchanger is also called a parallel flow heat exchanger and has the advantages of high heat exchange coefficient and low cost. Some devices requiring a large amount of heat exchange, such as multi-split air conditioning units, often adopt a double-row micro-channel heat exchanger design.
The inventor finds that the frosting degree of the inner row micro-channel heat exchanger and the frosting degree of the outer row micro-channel heat exchanger are different in the working process of the double-row micro-channel heat exchanger, and if the frosting is not timely removed, the whole working performance of the double-row micro-channel heat exchanger is influenced.
Disclosure of Invention
According to some embodiments of the present disclosure, the opening degrees of the inner/outer row expansion valves are respectively controlled, and the flow rates of the inner/outer row heat exchangers are respectively adjusted, so that different defrosting degrees can be controlled according to different frosting degrees of the inner/outer row heat exchangers, and the inner/outer row heat exchangers are vertically arranged, which is beneficial to the discharge of defrosting water and improves defrosting efficiency.
The embodiment of the present disclosure provides an outer quick-witted heat exchanger, include:
the outer machine inner row micro-channel heat exchanger and the outer machine outer row micro-channel heat exchanger are vertically arranged;
an opening-controllable outer machine inner row electronic expansion valve is arranged at an outlet of the outer machine inner row micro-channel heat exchanger;
and the opening-controllable outer-unit outer-discharge electronic expansion valve is arranged at the outlet of the outer-unit outer-discharge micro-channel heat exchanger.
In some embodiments, a shared gas collecting pipe is arranged at the inlet of the outer machine inner row micro-channel heat exchanger and the inlet of the outer machine outer row micro-channel heat exchanger.
In some embodiments, a liquid collecting pipe is respectively arranged at the outlet of the outer machine inner row microchannel heat exchanger and the outlet of the outer machine outer row microchannel heat exchanger, a plurality of cavities are arranged in each liquid collecting pipe, each cavity is provided with an outlet, and each outlet of each liquid collecting pipe is respectively communicated to the pipeline bundle through respective pipelines.
In some embodiments, the outdoor unit heat exchanger further comprises:
an outer machine inner row temperature sensor is arranged at an outlet of the outer machine inner row micro-channel heat exchanger;
an outer machine outer discharge temperature sensor is arranged at an outlet of the outer machine outer discharge micro-channel heat exchanger;
and the number of the first and second groups,
and the control unit for controlling the opening degree of the expansion valve is electrically connected with the outer machine inner row temperature sensor, the outer machine outer row temperature sensor, the outer machine inner row electronic expansion valve and the outer machine outer row electronic expansion valve respectively.
In some embodiments, the control unit is configured to calculate a difference between a temperature sensed by the outer unit inner row temperature sensor and a temperature sensed by the outer unit outer row temperature sensor, and perform linkage control or independent control on the opening degree of the outer unit inner row electronic expansion valve and the opening degree of the outer unit outer row electronic expansion valve according to the difference.
In some embodiments, the control unit is configured to:
when the difference value is larger than a first threshold value, adjusting the opening degree of the electronic expansion valves arranged outside the outer machine to the current opening degree minus an opening degree adjusting value, and adjusting the opening degree of the electronic expansion valves arranged outside the outer machine to the current opening degree plus the opening degree adjusting value; alternatively, the first and second electrodes may be,
when the difference value is smaller than a second threshold value, adjusting the opening degree of the electronic expansion valves arranged outside the outer machine to the current opening degree plus an opening degree adjusting value, and adjusting the opening degree of the electronic expansion valves arranged outside the outer machine to the current opening degree minus the opening degree adjusting value;
wherein the first threshold is greater than the second threshold.
In some embodiments, the control unit is configured to:
when the difference value is greater than or equal to a second threshold value and less than or equal to a first threshold value, adjusting the opening degree of the electronic expansion valve arranged outside the outer machine to a first opening degree range, and adjusting the opening degree of the electronic expansion valve arranged outside the outer machine to a second opening degree range;
the first threshold value is larger than the second threshold value, and the first opening degree range is smaller than the second opening degree range.
In some embodiments, the control unit is configured to:
when the difference value is greater than or equal to a second threshold value and less than or equal to a first threshold value, reducing the opening degree of the electronic expansion valve of the outer machine inner row within a first opening degree range along with the increase of the temperature sensed by the outer machine inner row temperature sensor; alternatively, the first and second electrodes may be,
and when the difference value is greater than or equal to a second threshold value and less than or equal to a first threshold value, reducing the opening degree of the outer-unit outer-discharge electronic expansion valve within a second opening degree range along with the increase of the temperature sensed by the outer-unit outer-discharge temperature sensor.
Some embodiments of the present disclosure provide an air conditioning system, including: the outdoor unit heat exchanger according to any one of the embodiments.
In some embodiments, the air conditioning system further comprises: the system comprises a compressor, an internal machine heat exchanger, a four-way valve and a gas-liquid separator;
the outlets of the outer machine inner row electronic expansion valve and the outer machine outer row electronic expansion valve are respectively communicated with a compressor and an inner machine heat exchanger, the inner machine heat exchanger is communicated with a gas-liquid separator through a four-way valve, the gas-liquid separator is communicated with the compressor, and the compressor is communicated with the outer machine inner row micro-channel heat exchanger and a gas collecting pipe of the outer machine outer row micro-channel heat exchanger through the four-way valve.
In some embodiments, a plate heat exchanger is disposed in a pipeline between the outlets of the outer machine outer row electronic expansion valve and the compressor and the inner machine heat exchanger.
In some embodiments, the indoor unit heat exchanger comprises a plurality of rows of indoor unit heat exchangers, and each row of indoor unit heat exchangers is provided with an indoor unit electronic expansion valve.
Some embodiments of the present disclosure provide a method for controlling an external unit heat exchanger, including:
calculating the difference between the temperature sensed by the outer machine inner row temperature sensor and the temperature sensed by the outer machine outer row temperature sensor;
and performing linkage control or independent control on the opening degree of the electronic expansion valve arranged outside the external machine and the opening degree of the electronic expansion valve arranged outside the external machine according to the difference value.
In some embodiments, the linkage control comprises:
when the difference value is larger than a first threshold value, adjusting the opening degree of the electronic expansion valves arranged outside the outer machine to the current opening degree minus an opening degree adjusting value, and adjusting the opening degree of the electronic expansion valves arranged outside the outer machine to the current opening degree plus the opening degree adjusting value; alternatively, the first and second electrodes may be,
when the difference value is smaller than a second threshold value, adjusting the opening degree of the electronic expansion valves arranged outside the outer machine to the current opening degree plus an opening degree adjusting value, and adjusting the opening degree of the electronic expansion valves arranged outside the outer machine to the current opening degree minus the opening degree adjusting value;
wherein the first threshold is greater than the second threshold.
In some embodiments, the independent control comprises:
when the difference value is greater than or equal to a second threshold value and less than or equal to a first threshold value, adjusting the opening degree of the electronic expansion valve arranged outside the outer machine to a first opening degree range, and adjusting the opening degree of the electronic expansion valve arranged outside the outer machine to a second opening degree range;
the first threshold value is larger than the second threshold value, and the first opening degree range is smaller than the second opening degree range.
In some embodiments, adjusting the opening degree of the outer-machine inner-row electronic expansion valve to the first opening degree range includes: when the difference value is greater than or equal to a second threshold value and less than or equal to a first threshold value, reducing the opening degree of the electronic expansion valve of the outer machine inner row within a first opening degree range along with the increase of the temperature sensed by the outer machine inner row temperature sensor;
in some embodiments, adjusting the opening degree of the outer-unit-outer-row electronic expansion valve to the second opening degree range includes: and when the difference value is greater than or equal to a second threshold value and less than or equal to a first threshold value, reducing the opening degree of the outer-unit outer-discharge electronic expansion valve within a second opening degree range along with the increase of the temperature sensed by the outer-unit outer-discharge temperature sensor.
Some embodiments of the present disclosure provide a control unit of an external machine heat exchanger, including:
a memory; and
a processor coupled to the memory, the processor configured to execute the control method of the outer machine heat exchanger according to any one of the embodiments based on instructions stored in the memory.
Some embodiments of the present disclosure provide a non-transitory computer-readable storage medium having stored thereon a computer program, which when executed by a processor, implements the control method of the outer machine heat exchanger according to any one of the embodiments.
Drawings
The drawings that will be used in the description of the embodiments or the related art will be briefly described below. The present disclosure will be more clearly understood from the following detailed description, which proceeds with reference to the accompanying drawings,
it is to be understood that the drawings in the following description are merely exemplary of the disclosure, and that other drawings may be derived from those drawings by one of ordinary skill in the art without undue inventive faculty.
Fig. 1 illustrates a schematic view of an outdoor unit heat exchanger and an air conditioning system using the same according to some embodiments of the present disclosure.
Fig. 2 shows a schematic structural diagram of an outer machine inner row microchannel heat exchanger or an outer machine outer row microchannel heat exchanger according to some embodiments of the present disclosure.
Fig. 3 shows a schematic structural diagram of an L-shaped outer unit inner row microchannel heat exchanger or outer unit outer row microchannel heat exchanger according to some embodiments of the present disclosure.
Fig. 4 shows a schematic structural diagram of an outer unit inner row microchannel heat exchanger or an outer unit outer row microchannel heat exchanger of a C-type according to some embodiments of the present disclosure.
Fig. 5 shows a flow chart of a control method of an outdoor unit heat exchanger according to some embodiments of the present disclosure.
Fig. 6 illustrates a schematic diagram of a control unit of an external machine heat exchanger according to some embodiments of the present disclosure.
Detailed Description
The technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in the embodiments of the present disclosure.
Fig. 1 illustrates a schematic view of an outdoor unit heat exchanger and an air conditioning system using the same according to some embodiments of the present disclosure. It should be noted that the external unit heat exchanger may also be applied to other devices requiring heat exchange, and is not limited to an air conditioning system.
As shown in fig. 1, the air conditioning system includes: a compressor 1; a four-way valve 2; an outer machine inner row micro-channel heat exchanger 3; an outer machine discharge micro-channel heat exchanger 4; an electronic expansion valve 5 is arranged in the outdoor unit; an electronic expansion valve 6 is arranged outside the outdoor unit; a plate heat exchanger 7; an air supply electronic expansion valve 8; shut-off valves 9, 14; internal machine electronic expansion valves 10, 12; the indoor machine heat exchangers 11, 13; an outer fan 15; a gas-liquid separator 16; an outer machine inner row temperature sensor (such as an outer machine inner row temperature sensing bulb) 17; an outer-unit outer-discharge temperature sensor (e.g., an outer-unit outer-discharge temperature sensing bulb) 18; a control unit 19.
The inner machine heat exchangers 11 and 13 are communicated with a gas-liquid separator 16 through a four-way valve 2, the gas-liquid separator 16 is communicated with a compressor 1, and the compressor 1 is communicated with the outer machine inner row micro-channel heat exchanger 3 and a gas collecting pipe of the outer machine outer row micro-channel heat exchanger 4 through the four-way valve 2. Outlets of the outer machine inner row electronic expansion valve 5 and the outer machine outer row electronic expansion valve 6 are respectively communicated with the compressor 1 and the inner machine heat exchangers 11 and 13. And a plate heat exchanger 7 is arranged in a pipeline between the outlets of the outer machine outer row electronic expansion valve 5 and the outer machine outer row electronic expansion valve 6 and the compressor 1 and the inner machine heat exchangers 11 and 13. The outlet of the plate heat exchanger 7 is divided into two paths, one path is led to the inner machine heat exchangers 11 and 13 through the stop valve 9, and the other path is led to the compressor 1 through the air supply electronic expansion valve 8. The indoor machine heat exchanger comprises one or more rows of indoor machine heat exchangers, wherein double rows of indoor machine heat exchangers 11, 13 are shown in the figure, and each row of indoor machine heat exchangers can be provided with an indoor machine electronic expansion valve 10, 12.
The air conditioning system can be operated in a heating mode or a defrosting mode, and in the heating mode or the defrosting mode, the flow of the external machine internal row micro-channel heat exchanger 3 and the external machine external row micro-channel heat exchanger 4 can be respectively adjusted, so that the external machine internal/external row flow control is realized, and the energy efficiency is improved.
A heating cycle process: low-temperature and low-pressure gas enters an air suction port of a compressor 1 from an outlet of a gas-liquid separator 16, is compressed into high-temperature and high-pressure gas, enters a stop valve 14 through a four-way valve 2, is subjected to heat exchange through inner machine heat exchangers 11 and 13 to form high-temperature and high-pressure liquid, respectively passes through inner machine electronic expansion valves 10 and 12, is converged and then passes through a stop valve 9, wherein one part of the high-temperature and low-pressure gas passes through an air-supplying electronic expansion valve 8 to be throttled and cooled and enters a plate heat exchanger 7, the discharged low-temperature and low-pressure gas enters an air-supplying enthalpy-increasing pipe of the compressor 1, most of main-path high-temperature liquid refrigerant passes through the plate heat exchanger 7 to be divided into two paths, one path of the high-temperature and low-pressure liquid refrigerant enters an outer machine inner row electronic expansion valve 5 to, the low-temperature and low-pressure gas discharged from the gas collecting pipes of the external machine internal discharge micro-channel heat exchanger 3 and the external machine external discharge micro-channel heat exchanger 4 is converged and then enters the gas-liquid separator 16 through the four-way valve 2, and a heating cycle is completed.
Defrosting cycle process: low-temperature low-pressure gas enters an air suction port of a compressor 1 from an outlet of a gas-liquid separator 16, the high-temperature high-pressure gas which is compressed into high-temperature high-pressure gas enters an outer machine internal discharge micro-channel heat exchanger 3 and an outer machine external discharge micro-channel heat exchanger 4 through a four-way valve 2 and a gas collecting pipe respectively, the high-temperature high-pressure gas is condensed into high-pressure high-temperature liquid in the micro-channel heat exchanger, one path of the high-pressure liquid discharged from the outer machine internal discharge micro-channel heat exchanger 3 passes through an outer machine internal discharge electronic expansion valve 5, the other path of the high-pressure liquid discharged from the outer machine external discharge micro-channel heat exchanger 4 passes through an outer machine external discharge electronic expansion valve 6, the two flow paths are combined and enter a plate type heat exchanger 7 for further supercooling, a part of high-pressure liquid refrigerant discharged from the plate type heat exchanger 7 is throttled and cooled by an air supply, The 12 throttles and enters the heat exchangers 11 and 13 of the internal machine to absorb heat to form low-temperature and low-pressure gas, the low-temperature and low-pressure gas is converged and then enters the four-way valve 2 through the stop valve 14 and then enters the gas-liquid separator 16 to complete a defrosting cycle. In the defrosting cycle, the external machine internal row micro-channel heat exchanger 3 and the external machine external row micro-channel heat exchanger 4 can be defrosted.
As shown in fig. 1, the outdoor unit heat exchanger includes: the outer machine inner row micro-channel heat exchanger 3 and the outer machine outer row micro-channel heat exchanger 4 are vertically arranged; an opening-controllable outer machine inner row electronic expansion valve 5 is arranged at an outlet of the outer machine inner row micro-channel heat exchanger 3; and an external unit external discharge electronic expansion valve 6 with controllable opening is arranged at the outlet of the external unit external discharge micro-channel heat exchanger 4.
The flow of the inner/outer heat exchangers is respectively adjusted by respectively controlling the opening degrees of the inner/outer expansion valves, so that different defrosting degrees can be controlled according to different frosting degrees of the inner/outer heat exchangers; the inner/outer heat exchangers are vertically arranged, so that a gas collecting pipe, a liquid collecting pipe, fins and the like of the heat exchangers are vertically arranged, the discharge of defrosting water is facilitated, and the defrosting efficiency is improved.
As shown in fig. 1, the external machine heat exchanger further includes: an outer machine inner row temperature sensor 17 is arranged at the outlet of the outer machine inner row micro-channel heat exchanger 3; an outer machine outer discharge temperature sensor 18 is arranged at an outlet of the outer machine outer discharge micro-channel heat exchanger 4; and a control unit 19 for controlling the opening degree of the expansion valve, which is electrically connected with the outer machine inner row temperature sensor 17, the outer machine outer row temperature sensor 18, the outer machine inner row electronic expansion valve 5 and the outer machine outer row electronic expansion valve 6 respectively.
Respectively adjusting the opening degree of the inner/outer discharge expansion valve based on the inner/outer discharge temperature; and because water flows downwards, the more the water is difficult to defrost downwards, therefore, the temperature sensor is arranged at the outlet of the heat exchanger, the defrosting condition can be reflected most accurately, and the condition that defrosting is not clean is avoided.
And a shared gas collecting pipe is arranged at the inlet of the outer machine inner row micro-channel heat exchanger 3 and the inlet of the outer machine outer row micro-channel heat exchanger 4.
The air inlet resistance of the internal/external heat exchanger is consistent in the defrosting process, the initial flow difference is reduced, and the difference of the frosting degree of the internal/external heat exchanger is reduced.
And a liquid collecting pipe is respectively arranged at the outlet of the outer machine inner row micro-channel heat exchanger 3 and the outlet of the outer machine outer row micro-channel heat exchanger 4. A plurality of cavities are arranged in each liquid collecting pipe, each cavity is provided with an outlet, and each outlet of each liquid collecting pipe is respectively communicated with a pipeline bundle (such as a capillary bundle) through a respective pipeline (such as a capillary, and the length of the capillary bundle can be adjusted).
Fig. 2 shows a schematic structural diagram of an outer unit inner row microchannel heat exchanger 3 or an outer unit outer row microchannel heat exchanger 4 according to some embodiments of the present disclosure, where A, B, C, D denotes a liquid collecting pipe, a microchannel heat exchange assembly, a gas collecting pipe, and a pipeline bundle, respectively. Fig. 3 shows a schematic structural diagram of an L-shaped outer unit inner row microchannel heat exchanger 3 or outer unit outer row microchannel heat exchanger 4 according to some embodiments of the present disclosure. Fig. 4 shows a schematic structural diagram of an outer unit inner row microchannel heat exchanger 3 or an outer unit outer row microchannel heat exchanger 4 in a C-shape according to some embodiments of the present disclosure. Line bundle D is not shown in fig. 3-4.
The arrangement of the multi-cavity and the multi-outlet in the liquid collecting pipe is beneficial to the discharge of defrosting water and improves defrosting efficiency.
The control unit 19 is configured to calculate a difference between the temperature sensed by the outer unit inner row temperature sensor 17 and the temperature sensed by the outer unit outer row temperature sensor 18, and perform linkage control or independent control on the opening degrees of the outer unit inner row electronic expansion valves 5 and the outer unit outer row electronic expansion valves 6 according to the size of the difference.
And based on the difference value of the inner/outer discharge temperatures, the opening degree of the inner/outer discharge expansion valve is selected to be subjected to linkage control or independent control, so that the integral defrosting efficiency is improved.
For the linkage control logic, the control unit 19 is configured to: when the difference value is larger than a first threshold value, adjusting the opening degree of the electronic expansion valve 5 arranged outside the outer machine to the current opening degree minus an opening degree adjusting value, and adjusting the opening degree of the electronic expansion valve 6 arranged outside the outer machine to the current opening degree plus the opening degree adjusting value; or when the difference is smaller than a second threshold value, adjusting the opening degree of the electronic expansion valve 5 arranged outside the outer machine to the current opening degree plus an opening degree adjusting value, and adjusting the opening degree of the electronic expansion valve 6 arranged outside the outer machine to the current opening degree minus the opening degree adjusting value; wherein the first threshold is greater than the second threshold.
When the difference between the internal/external temperature is large, the opening degree of the internal/external expansion valve is controlled in a linkage manner, so that the defrosting progress of the internal/external heat exchanger tends to be consistent, and the overall defrosting efficiency is improved. The heat exchanger is prevented from completing defrosting early to wait ineffectively, and the overall defrosting time is prolonged.
For the independent control logic, the control unit 19 is configured to: when the difference value is greater than or equal to a second threshold value and less than or equal to a first threshold value, adjusting the opening degree of the electronic expansion valve 5 arranged outside the outer machine to a first opening degree range, and adjusting the opening degree of the electronic expansion valve 6 arranged outside the outer machine to a second opening degree range; the first threshold value is larger than the second threshold value, and the first opening degree range is smaller than the second opening degree range.
When the difference between the internal and external temperature is not large, the opening degree of the internal and external expansion valves is independently controlled, more flow is distributed to the external heat exchanger with thicker frost, and less flow is distributed to the internal heat exchanger with thinner frost, so that the internal and external heat exchangers are quickly defrosted by the most suitable flow distribution.
For each control branch of the independent control logic, the control unit 19 is configured to: when the difference is greater than or equal to the second threshold and less than or equal to the first threshold, the opening degree of the electronic expansion valve 5 of the outer machine inner row is decreased within the first opening degree range with the increase of the temperature sensed by the outer machine inner row temperature sensor 17, and the opening degree of the electronic expansion valve 5 of the outer machine inner row may be set to some levels, and decreased step by step (for a specific example, see step S523); alternatively, when the difference is greater than or equal to the second threshold and less than or equal to the first threshold, the opening degree of the outer-unit outer-discharge electronic expansion valve 6 is decreased within the second opening degree range with the increase of the temperature sensed by the outer-unit outer-discharge temperature sensor 18, and the opening degree of the outer-unit outer-discharge electronic expansion valve 6 may be set to some levels, so as to decrease the opening degree step by step (for a specific example, refer to step S524).
Along with the promotion of the defrosting process, the frosting of the inner/outer heat exchanger is thinner and thinner, and the opening degree of the inner/outer expansion valve can be gradually reduced, so that the flow and the defrosting effect in the inner/outer heat exchanger are more stable.
Fig. 5 shows a flow chart of a control method of an outdoor unit heat exchanger according to some embodiments of the present disclosure.
As shown in fig. 5, the control method of this embodiment includes:
in step S510, a difference T1-T2 between the temperature T1 sensed by the outer-unit inner-row temperature sensor 17 and the temperature T2 sensed by the outer-unit outer-row temperature sensor 18 is calculated.
The temperature sensed by the temperature sensor can reflect the defrosting state of the corresponding outer machine heat exchanger. The lower the temperature sensed by the temperature sensor is, the thicker the residual frost layer of the outer machine heat exchanger is, and the larger the opening degree of the electronic expansion valve should be. The larger the difference between T1 and T2 is, the larger the difference between the frost thickness of the heat exchangers of the two outdoor units is.
In step S520, the opening degrees of the electronic expansion valves 5 arranged outside the external machine and the opening degrees of the electronic expansion valves 6 arranged outside the external machine are controlled in a linkage manner or independently according to the difference.
Setting: the first threshold value Th1 is larger than the second threshold value Th2, and the first opening degree range is smaller than the second opening degree range.
The linkage control includes: S521-S522.
In step S521, when the difference is greater than the first threshold, it is determined that the remaining frost layer of the outer machine inner row microchannel heat exchanger 3 is much thinner than the remaining frost layer of the outer machine outer row microchannel heat exchanger 4, the opening of the outer machine inner row electronic expansion valve 5 is adjusted to the current opening minus the opening adjustment value, the defrosting performance of the outer machine inner row microchannel heat exchanger 3 is appropriately reduced, the opening of the outer machine outer row electronic expansion valve 6 is adjusted to the current opening plus the opening adjustment value, and the defrosting performance of the outer machine outer row microchannel heat exchanger 4 is appropriately increased.
The opening degree of the electronic expansion valve 5 at the outer machine inner row is equal to the current opening degree-delta PLS;
the opening degree of the external electronic expansion valve 6 of the outdoor unit is equal to the current opening degree plus delta PLS;
where Δ PLS represents an opening degree adjustment value.
In step S522, when the difference is smaller than the second threshold, it indicates that the remaining frost layer of the outer machine inner row microchannel heat exchanger 3 is thicker than the remaining frost layer of the outer machine outer row microchannel heat exchanger 4, the opening of the outer machine inner row electronic expansion valve 5 is adjusted to the current opening plus the opening adjustment value, the defrosting performance of the outer machine inner row microchannel heat exchanger 3 is appropriately increased, the opening of the outer machine outer row electronic expansion valve 6 is adjusted to the current opening minus the opening adjustment value, and the defrosting performance of the outer machine outer row microchannel heat exchanger 4 is appropriately decreased.
The opening degree of the electronic expansion valve 5 on the outer machine inner row is equal to the current opening degree plus delta PLS;
the opening degree of the external electronic expansion valve 6 of the outdoor unit is equal to the current opening degree-delta PLS;
where Δ PLS represents an opening degree adjustment value.
The independent control includes: S523-S524.
In step S523, when the difference is greater than or equal to the second threshold value and less than or equal to the first threshold value, the opening degree of the outer-unit inner-row electronic expansion valve 5 is adjusted to the first opening degree range.
Adjusting the opening degree of the outer-unit inner-row electronic expansion valve 5 to the first opening degree range includes: when the difference is equal to or greater than the second threshold value Th2 and equal to or less than the first threshold value Th1, the opening degree of the outer-inner-row electronic expansion valve 5 is decreased within the first opening degree range as the temperature sensed by the outer-inner-row temperature sensor 17 increases. Can be set in certain grades, and the opening degree of the electronic expansion valve 5 arranged in the outer machine is gradually reduced
For example, set up: the defrosting temperature parameters Tc1 and Tc2(Tc1< Tc2), three opening degrees Hs03, Hs02 and Hs01 are selected in the first opening degree range, and Hs03 is larger than Hs02 and is larger than Hs 01.
When Th2 is not less than T1-T2 is not less than Th1, the electronic expansion valve 5 in the outer machine and the inner row enters independent control: the opening degree of the electronic expansion valve 5 at the outer machine inner row is adjusted to Hs 03; with the progress of the defrosting process, when T1 is more than Tc1, the opening degree of the electronic expansion valve 5 arranged in the outer machine is adjusted to Hs02, otherwise, Hs03 is maintained; with the continuous progress of the defrosting process, when T1 is greater than Tc2, the opening degree of the electronic expansion valve 5 in the outer machine and the inner row is adjusted to Hs01, otherwise, Hs02 is maintained.
In step S524, when the difference is greater than or equal to the second threshold and less than or equal to the first threshold, the opening degree of the outer-unit outer-discharge electronic expansion valve 6 is adjusted to the second opening degree range.
Adjusting the opening degree of the outer-engine outer-discharge electronic expansion valve 6 to the second opening degree range comprises: when the difference is greater than or equal to the second threshold value Th2 and less than or equal to the first threshold value Th1, the opening degree of the outer-unit-exterior electronic expansion valve 6 is decreased within the second opening degree range as the temperature sensed by the outer-unit-exterior-temperature sensor 18 increases. Some levels can be set, and the opening degree of the external electronic expansion valve 6 of the external machine is gradually reduced.
For example, set up: defrosting temperature parameters Tc1 and Tc2(Tc1< Tc2), three opening degrees Hs06, Hs05 and Hs04 are selected in a second opening degree range, and Hs06 > Hs05 > Hs04 > Hs03 > Hs02 > Hs 01.
When Th2 is not less than T1-T2 is not less than Th1, the outer-unit outer-row electronic expansion valve 6 is independently controlled: the opening degree of the external electronic expansion valve 6 is adjusted to Hs 06; along with the progress of the defrosting process, when T2 is more than Tc1, the opening degree of the outer-machine outer-discharge electronic expansion valve 6 is adjusted to Hs05, otherwise, Hs06 is maintained; with the continuous advancing of the defrosting process, when T2 is larger than Tc2, the opening degree of the outer-machine outer-discharge electronic expansion valve 6 is adjusted to Hs04, and otherwise, Hs05 is maintained.
And based on the difference value of the inner/outer discharge temperatures, the opening degree of the inner/outer discharge expansion valve is selected to be subjected to linkage control or independent control, so that the integral defrosting efficiency is improved. When the difference between the internal/external temperature is large, the opening degree of the internal/external expansion valve is controlled in a linkage manner, so that the defrosting progress of the internal/external heat exchanger tends to be consistent, and the overall defrosting efficiency is improved. When the difference between the internal and external temperature is not large, the opening degree of the internal and external expansion valves is independently controlled, more flow is distributed to the external heat exchanger with thicker frost, and less flow is distributed to the internal heat exchanger with thinner frost, so that the internal and external heat exchangers are quickly defrosted by the most suitable flow distribution.
Fig. 6 illustrates a schematic diagram of a control unit of an external machine heat exchanger according to some embodiments of the present disclosure.
As shown in fig. 6, the control unit 19 of this embodiment includes: a memory 191 and a processor 192 coupled to the memory, wherein the processor 192 is configured to execute the control method of the outdoor unit heat exchanger in any of the foregoing embodiments based on instructions stored in the memory 191.
The memory 191 may include, for example, a system memory, a fixed nonvolatile storage medium, and the like. The system memory stores, for example, an operating system, an application program, a Boot Loader (Boot Loader), and other programs.
The disclosed embodiments also provide a non-transitory computer-readable storage medium on which a computer program is stored, where the computer program, when executed by a processor, implements the control method of the external machine heat exchanger in any of the foregoing embodiments.
As will be appreciated by one skilled in the art, embodiments of the present disclosure may be provided as a method, system, or computer program product. Accordingly, the present disclosure may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present disclosure may take the form of a computer program product embodied on one or more computer-usable non-transitory storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present disclosure is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the disclosure. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The above description is only exemplary of the present disclosure and is not intended to limit the present disclosure, so that any modification, equivalent replacement, or improvement made within the spirit and principle of the present disclosure should be included in the scope of the present disclosure.
Claims (18)
1. An outdoor unit heat exchanger, comprising:
the outer machine inner row micro-channel heat exchanger and the outer machine outer row micro-channel heat exchanger are vertically arranged;
an opening-controllable outer machine inner row electronic expansion valve is arranged at an outlet of the outer machine inner row micro-channel heat exchanger;
and the opening-controllable outer-unit outer-discharge electronic expansion valve is arranged at the outlet of the outer-unit outer-discharge micro-channel heat exchanger.
2. The outdoor unit heat exchanger according to claim 1,
and a shared gas collecting pipe is arranged at the inlet of the outer machine inner row micro-channel heat exchanger and the inlet of the outer machine outer row micro-channel heat exchanger.
3. The outdoor unit heat exchanger according to claim 1,
the outlet of the outer machine inner row micro-channel heat exchanger and the outlet of the outer machine outer row micro-channel heat exchanger are respectively provided with a liquid collecting pipe, a plurality of cavities are arranged in each liquid collecting pipe, each cavity is provided with an outlet, and each outlet of each liquid collecting pipe is communicated with a pipeline bundle through a respective pipeline.
4. The outdoor unit heat exchanger according to any one of claims 1 to 3, further comprising:
an outer machine inner row temperature sensor is arranged at an outlet of the outer machine inner row micro-channel heat exchanger;
an outer machine outer discharge temperature sensor is arranged at an outlet of the outer machine outer discharge micro-channel heat exchanger;
and the number of the first and second groups,
and the control unit for controlling the opening degree of the expansion valve is electrically connected with the outer machine inner row temperature sensor, the outer machine outer row temperature sensor, the outer machine inner row electronic expansion valve and the outer machine outer row electronic expansion valve respectively.
5. The outdoor unit heat exchanger according to claim 4,
the control unit is configured to calculate a difference value between the temperature sensed by the outer machine inner row temperature sensor and the temperature sensed by the outer machine outer row temperature sensor, and perform linkage control or independent control on the opening degree of the outer machine inner row electronic expansion valve and the opening degree of the outer machine outer row electronic expansion valve according to the difference value.
6. The outdoor unit heat exchanger according to claim 5, wherein the control unit is configured to:
when the difference value is larger than a first threshold value, adjusting the opening degree of the electronic expansion valves arranged outside the outer machine to the current opening degree minus an opening degree adjusting value, and adjusting the opening degree of the electronic expansion valves arranged outside the outer machine to the current opening degree plus the opening degree adjusting value; alternatively, the first and second electrodes may be,
when the difference value is smaller than a second threshold value, adjusting the opening degree of the electronic expansion valves arranged outside the outer machine to the current opening degree plus an opening degree adjusting value, and adjusting the opening degree of the electronic expansion valves arranged outside the outer machine to the current opening degree minus the opening degree adjusting value;
wherein the first threshold is greater than the second threshold.
7. The outdoor unit heat exchanger according to claim 5, wherein the control unit is configured to:
when the difference value is greater than or equal to a second threshold value and less than or equal to a first threshold value, adjusting the opening degree of the electronic expansion valve arranged outside the outer machine to a first opening degree range, and adjusting the opening degree of the electronic expansion valve arranged outside the outer machine to a second opening degree range;
the first threshold value is larger than the second threshold value, and the first opening degree range is smaller than the second opening degree range.
8. The outdoor unit heat exchanger according to claim 7, wherein the control unit is configured to:
when the difference value is greater than or equal to a second threshold value and less than or equal to a first threshold value, reducing the opening degree of the electronic expansion valve of the outer machine inner row within a first opening degree range along with the increase of the temperature sensed by the outer machine inner row temperature sensor; alternatively, the first and second electrodes may be,
and when the difference value is greater than or equal to a second threshold value and less than or equal to a first threshold value, reducing the opening degree of the outer-unit outer-discharge electronic expansion valve within a second opening degree range along with the increase of the temperature sensed by the outer-unit outer-discharge temperature sensor.
9. An air conditioning system, comprising: the outdoor unit heat exchanger of any one of claims 1 to 8.
10. The air conditioning system of claim 9, further comprising:
the system comprises a compressor, an internal machine heat exchanger, a four-way valve and a gas-liquid separator;
the outlets of the outer machine inner row electronic expansion valve and the outer machine outer row electronic expansion valve are respectively communicated with a compressor and an inner machine heat exchanger, the inner machine heat exchanger is communicated with a gas-liquid separator through a four-way valve, the gas-liquid separator is communicated with the compressor, and the compressor is communicated with the outer machine inner row micro-channel heat exchanger and a gas collecting pipe of the outer machine outer row micro-channel heat exchanger through the four-way valve.
11. The air conditioning system of claim 10,
and a plate type heat exchanger is arranged in a pipeline between the outlets of the outer machine outer row electronic expansion valve and the compressor and the inner machine heat exchanger.
12. The air conditioning system of claim 10,
the indoor machine heat exchanger comprises a plurality of rows of indoor machine heat exchangers, and each row of indoor machine heat exchangers are provided with an indoor machine electronic expansion valve.
13. A control method for an external machine heat exchanger is characterized by comprising the following steps:
calculating the difference between the temperature sensed by the outer machine inner row temperature sensor and the temperature sensed by the outer machine outer row temperature sensor;
and performing linkage control or independent control on the opening degree of the electronic expansion valve arranged outside the external machine and the opening degree of the electronic expansion valve arranged outside the external machine according to the difference value.
14. The control method according to claim 13, characterized in that the linkage control includes:
when the difference value is larger than a first threshold value, adjusting the opening degree of the electronic expansion valves arranged outside the outer machine to the current opening degree minus an opening degree adjusting value, and adjusting the opening degree of the electronic expansion valves arranged outside the outer machine to the current opening degree plus the opening degree adjusting value; alternatively, the first and second electrodes may be,
when the difference value is smaller than a second threshold value, adjusting the opening degree of the electronic expansion valves arranged outside the outer machine to the current opening degree plus an opening degree adjusting value, and adjusting the opening degree of the electronic expansion valves arranged outside the outer machine to the current opening degree minus the opening degree adjusting value;
wherein the first threshold is greater than the second threshold.
15. The control method according to claim 13, characterized in that the independent control includes:
when the difference value is greater than or equal to a second threshold value and less than or equal to a first threshold value, adjusting the opening degree of the electronic expansion valve arranged outside the outer machine to a first opening degree range, and adjusting the opening degree of the electronic expansion valve arranged outside the outer machine to a second opening degree range;
the first threshold value is larger than the second threshold value, and the first opening degree range is smaller than the second opening degree range.
16. The control method according to claim 15,
adjusting the opening degree of the electronic expansion valve at the outer machine inner row to a first opening degree range comprises: when the difference value is greater than or equal to a second threshold value and less than or equal to a first threshold value, reducing the opening degree of the electronic expansion valve of the outer machine inner row within a first opening degree range along with the increase of the temperature sensed by the outer machine inner row temperature sensor;
adjusting the opening degree of the outer electronic expansion valve to a second opening degree range comprises: and when the difference value is greater than or equal to a second threshold value and less than or equal to a first threshold value, reducing the opening degree of the outer-unit outer-discharge electronic expansion valve within a second opening degree range along with the increase of the temperature sensed by the outer-unit outer-discharge temperature sensor.
17. A control unit of an external machine heat exchanger, comprising:
a memory; and
a processor coupled to the memory, the processor configured to execute the control method of the outdoor unit heat exchanger of any one of claims 13-16 based on instructions stored in the memory.
18. A non-transitory computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the control method of an outdoor unit heat exchanger according to any one of claims 13 to 16.
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