CN117433172A - Direct expansion type air conditioning system and control method thereof - Google Patents
Direct expansion type air conditioning system and control method thereof Download PDFInfo
- Publication number
- CN117433172A CN117433172A CN202311388539.4A CN202311388539A CN117433172A CN 117433172 A CN117433172 A CN 117433172A CN 202311388539 A CN202311388539 A CN 202311388539A CN 117433172 A CN117433172 A CN 117433172A
- Authority
- CN
- China
- Prior art keywords
- liquid
- condenser
- communicated
- temperature
- compressor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000004378 air conditioning Methods 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 title claims abstract description 21
- 239000007788 liquid Substances 0.000 claims abstract description 154
- 238000009413 insulation Methods 0.000 claims abstract description 46
- 238000005057 refrigeration Methods 0.000 claims abstract description 24
- 238000001816 cooling Methods 0.000 claims abstract description 18
- 238000005086 pumping Methods 0.000 claims abstract description 15
- 238000001514 detection method Methods 0.000 claims abstract description 14
- 239000003507 refrigerant Substances 0.000 claims description 57
- 230000001502 supplementing effect Effects 0.000 claims description 21
- 238000000605 extraction Methods 0.000 claims description 17
- 239000007921 spray Substances 0.000 claims description 14
- 238000004891 communication Methods 0.000 claims description 10
- 238000007599 discharging Methods 0.000 claims description 8
- 238000002309 gasification Methods 0.000 claims description 8
- 238000005507 spraying Methods 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 238000004321 preservation Methods 0.000 abstract description 13
- 230000001681 protective effect Effects 0.000 abstract description 6
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 230000010485 coping Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 239000013589 supplement Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000002528 anti-freeze Effects 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Classifications
-
- 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
- F25B1/00—Compression machines, plants or systems with non-reversible cycle
-
- 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
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
- F24F5/0007—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning
- F24F5/001—Compression cycle type
-
- 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
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
-
- 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
-
- 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
- F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Signal Processing (AREA)
- Analytical Chemistry (AREA)
- Sustainable Development (AREA)
- Life Sciences & Earth Sciences (AREA)
- Power Engineering (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses a direct expansion air conditioning system and a control method thereof, wherein the direct expansion air conditioning system comprises a main refrigeration mechanism and a condenser cooling mechanism, wherein the main refrigeration mechanism comprises a compressor, a condenser, a first expansion valve, a first evaporator and a temperature detection piece; the condenser cooling mechanism comprises an insulation box, a first control valve, a second expansion valve, a second evaporator and a liquid pumping assembly. The beneficial effects of the invention are as follows: starting the compressor and the first control valve in a preset time before the arrival of the extreme high temperature is predicted, so that the temperature of the liquid in the heat preservation box is reduced until the temperature of the liquid in the heat preservation box is lower than the preset temperature; when the temperature detection piece detects that the temperature of the condenser exceeds the preset temperature at extremely high temperature, the liquid which is refrigerated in the heat preservation box is pumped and sprayed on the condenser through the liquid pumping component, and the condenser is cooled, so that the conditions that the temperature of the condenser is too high and heat cannot be discharged normally, and the air conditioning system is stopped in a protective mode can be avoided.
Description
Technical Field
The invention relates to the technical field of direct expansion air conditioning systems, in particular to a direct expansion air conditioning system and a control method thereof.
Background
The direct expansion air conditioning system takes air blown by an outdoor fan as a cold source, consists of an air cooler and a combined air conditioner, and adopts one-time heat exchange of the direct expansion air conditioning system to perform centralized treatment on indoor air.
Under the condition of extremely high temperature, when the temperature of the outdoor condenser exceeds a certain value in a high-temperature environment, the condenser cannot normally exhaust heat, so that the air conditioning system is stopped in a protective way, and the use is influenced.
Disclosure of Invention
In view of the foregoing, it is necessary to provide a direct expansion air conditioning system and a control method thereof, which are used for solving the technical problems that the condenser cannot normally reject heat when the temperature of the outdoor condenser exceeds a certain value in a high-temperature environment under the condition of extremely high temperature, so that the air conditioning system is stopped in a protective way, and the use is affected.
In order to achieve the above object, the present invention provides a direct expansion air conditioning system comprising:
the main refrigeration mechanism comprises a compressor, a condenser, a first expansion valve, a first evaporator and a temperature detection piece, wherein an outlet of the compressor is communicated with one end of the condenser, the other end of the condenser is communicated with one end of the first expansion valve, the other end of the first expansion valve is communicated with one end of the first evaporator, the other end of the first evaporator is communicated with an inlet of the compressor, and the temperature detection piece is used for detecting the temperature of the condenser; the method comprises the steps of,
the condenser cooling mechanism comprises an insulation box, a first control valve, a second expansion valve, a second evaporator and a liquid pumping assembly, wherein liquid is stored in the insulation box, one end of the first control valve is communicated with the other end of the condenser, the other end of the first control valve is communicated with one end of the second expansion valve, the other end of the second expansion valve is communicated with one end of the second evaporator, the other end of the second evaporator is communicated with an inlet of the compressor, the second evaporator is arranged in the insulation box, and the liquid pumping assembly is used for pumping and spraying liquid in the insulation box on the condenser.
In some embodiments, the liquid extraction assembly comprises a liquid extraction pump, a liquid extraction pipe and a spray head, wherein an inlet of the liquid extraction pump is communicated with the heat insulation box, an outlet of the liquid extraction pump is communicated with one end of the liquid extraction pipe, the other end of the liquid extraction pipe is communicated with the spray head, and the spray head is arranged towards the condenser.
In some embodiments, the condenser cooling mechanism further comprises a liquid receiving box and a return pipe, the liquid receiving box is arranged below the condenser, one end of the return pipe is communicated with the liquid receiving box, and the other end of the return pipe is communicated with the heat insulation box.
In some embodiments, the condenser cooling mechanism further comprises a liquid supplementing pipe and a liquid supplementing valve, one end of the liquid supplementing pipe is communicated with the heat insulation box, the other end of the liquid supplementing pipe is communicated with a water source, and the liquid supplementing valve is arranged on the liquid supplementing pipe.
In some embodiments, the main refrigeration mechanism further comprises a liquid storage tank, an upper end of the liquid storage tank is communicated with the other end of the condenser, and a lower end of the liquid storage tank is communicated with one end of the first expansion valve and one end of the second expansion valve.
In some embodiments, the main refrigeration mechanism further comprises a dryer, one end of the dryer is communicated with the lower end of the liquid storage tank, and the other end of the dryer is communicated with one end of the first expansion valve and one end of the second expansion valve.
In some embodiments, the main refrigeration mechanism further comprises a heat exchanger, a first medium inlet of the heat exchanger is communicated with the other end of the dryer, a first medium outlet of the heat exchanger is communicated with one end of the first expansion valve and one end of the second expansion valve, a second medium inlet of the heat exchanger is communicated with the other end of the first evaporator and the other end of the second evaporator, and a second medium outlet of the heat exchanger is communicated with the inlet of the compressor.
In some embodiments, the main refrigeration mechanism further comprises a protection assembly comprising an inlet pressure detection member for detecting the pressure of the inlet of the compressor, an outlet pressure detection member for detecting the pressure of the outlet of the compressor, a bypass pipe having one end in communication with the inlet of the compressor and the other end in communication with the outlet of the compressor, and a bypass valve disposed on the bypass pipe.
In some embodiments, the main refrigeration mechanism further comprises a one-way valve, an inlet of the one-way valve being in communication with an outlet of the compressor, an outlet of the one-way valve being in communication with one end of the condenser.
The invention also provides a control method of the direct expansion air conditioning system, which is suitable for the direct expansion air conditioning system and comprises the following steps:
s1, starting a compressor and a first control valve in a preset time before the arrival of extreme high temperature is predicted, compressing a refrigerant into a high-pressure gas state by the compressor, then discharging the high-pressure gas state into a condenser, discharging the high-pressure gas state refrigerant into a high-pressure liquid state after heat release in the condenser, enabling the high-pressure liquid state refrigerant to enter a second expansion valve, enabling the high-pressure liquid state refrigerant to be converted into a low-pressure liquid state by the second expansion valve, enabling the low-pressure liquid state refrigerant to enter a second evaporator, enabling the low-pressure liquid state refrigerant to be gasified into a gas state in the second evaporator, absorbing heat in an insulation box in the gasification process, and enabling the temperature of liquid in the insulation box to be reduced until the temperature of the liquid in the insulation box is lower than the preset temperature;
s2, when the temperature is extremely high, the compressor is started, the first control valve is closed, the compressor compresses the refrigerant into a high-pressure gas state and then discharges the high-pressure gas state into the condenser, the high-pressure gas state refrigerant is changed into a high-pressure liquid state after releasing heat in the condenser, the high-pressure liquid state refrigerant then enters the first expansion valve, the first expansion valve enables the high-pressure liquid state refrigerant to be changed into a low-pressure liquid state, the low-pressure liquid state refrigerant enters the first evaporator arranged in the chamber, in the first evaporator, the low-pressure liquid state refrigerant is gasified into a gas state, heat in the chamber is absorbed in the gasification process, and the indoor temperature is reduced;
and S3, when the temperature detection part detects that the temperature of the condenser exceeds the preset temperature, sucking and spraying the refrigerated liquid in the heat insulation box on the condenser through the liquid sucking component, and cooling the condenser until the temperature of the condenser is lower than the preset temperature.
Compared with the prior art, the technical scheme provided by the invention has the beneficial effects that: starting the compressor and the first control valve in a preset time before the arrival of the extreme high temperature is predicted, so that the temperature of the liquid in the heat preservation box is reduced until the temperature of the liquid in the heat preservation box is lower than the preset temperature; when the temperature of the condenser is detected to be higher than the preset temperature by the temperature detection piece, the liquid which is refrigerated in the heat insulation box is pumped and sprayed on the condenser by the liquid pumping component, the temperature of the condenser is reduced until the temperature of the condenser is lower than the preset temperature, so that the conditions that the air conditioning system is stopped in a protective mode due to the fact that the temperature of the condenser is too high and heat cannot be discharged normally can be avoided, and the capacity of the air conditioner for coping with extremely high-temperature weather is improved.
Drawings
FIG. 1 is a schematic diagram of a direct expansion air conditioning system and a control method thereof according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a cooling mechanism of the condenser of FIG. 1;
in the figure: the device comprises a main refrigeration mechanism, an 11-compressor, a 12-condenser, a 13-first expansion valve, a 14-first evaporator, a 15-temperature detection part, a 16-second control valve, a 17-liquid storage tank, an 18-dryer, a 19-heat exchanger, a 110-protection component, a 111-inlet pressure detection part, a 112-outlet pressure detection part, a 113-bypass pipe, a 114-bypass valve, a 115-one-way valve, a 2-condenser cooling mechanism, a 21-heat preservation box, a 22-first control valve, a 23-second expansion valve, a 24-second evaporator, a 25-liquid extraction component, a 251-liquid extraction pump, a 252-liquid extraction pipe, a 253-spray nozzle, a 26-liquid receiving box, a 27-return pipe, a 28-liquid supplementing pipe and a 29-liquid supplementing valve.
Detailed Description
Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which form a part hereof, and together with the description serve to explain the principles of the invention, and are not intended to limit the scope of the invention.
Referring to fig. 1 and 2, the present invention provides a direct expansion air conditioning system, which includes a main refrigeration mechanism 1 and a condenser cooling mechanism 2.
The main refrigeration mechanism 1 comprises a compressor 11, a condenser 12, a first expansion valve 13, a first evaporator 14 and a temperature detecting member 15, wherein an outlet of the compressor 11 is communicated with one end of the condenser 12, the other end of the condenser 12 is communicated with one end of the first expansion valve 13, the other end of the first expansion valve 13 is communicated with one end of the first evaporator 14, the other end of the first evaporator 14 is communicated with an inlet of the compressor 11, in the embodiment, the first evaporator 14 is arranged indoors and circulates with indoor air through a fan, and the temperature detecting member 15 is used for detecting the temperature of the condenser 12; the method comprises the steps of,
the condenser cooling mechanism 2 comprises an insulation box 21, a first control valve 22, a second expansion valve 23, a second evaporator 24 and a liquid pumping assembly 25, wherein liquid (such as water or antifreeze) is stored in the insulation box 21, one end of the first control valve 22 is communicated with the other end of the condenser 12, the other end of the first control valve 22 is communicated with one end of the second expansion valve 23, the other end of the second expansion valve 23 is communicated with one end of the second evaporator 24, the other end of the second evaporator 24 is communicated with an inlet of the compressor 11, the second evaporator 24 is arranged in the insulation box 21, and the liquid pumping assembly 25 is used for pumping and spraying the liquid in the insulation box 21 onto the condenser 12. In this embodiment, a plurality of heat conducting fins 211 are further disposed in the heat insulation box 21, so that heat exchange between the liquid at the lower part of the heat insulation box 21 and the gas above is facilitated.
The using steps are as follows:
s1, starting a compressor 11 and a first control valve 22 in a preset time (for example, 4 hours) before the arrival of an extremely high temperature is predicted, compressing a refrigerant into a high-pressure gas state by the compressor 11, discharging the gas into a condenser 12, discharging the high-pressure gas-state refrigerant into a high-pressure liquid state by the high-pressure gas-state refrigerant after heat release in the condenser 12, enabling the high-pressure liquid-state refrigerant to enter a second expansion valve 23, enabling the high-pressure liquid-state refrigerant to be converted into a low-pressure liquid state by the second expansion valve 23, enabling the low-pressure liquid-state refrigerant to enter a second evaporator 24, enabling the low-pressure liquid-state refrigerant to be gasified into a gas state in the second evaporator 24, absorbing heat in an insulation box 21 in the gasification process, and enabling the liquid temperature in the insulation box 21 to be reduced until the liquid temperature in the insulation box 21 is lower than the preset temperature;
s2, when the temperature is extremely high, the compressor 11 is started, the first control valve 22 is closed, the compressor 11 compresses the refrigerant into a high-pressure gas state and then discharges the high-pressure gas state into the condenser 12, the high-pressure gas state refrigerant releases heat in the condenser 12 and then becomes a high-pressure liquid state, the high-pressure liquid state refrigerant then enters the first expansion valve 13, the first expansion valve 13 enables the high-pressure liquid state refrigerant to be converted into a low-pressure liquid state, the low-pressure liquid state refrigerant enters the first evaporator 14 arranged in a room, the low-pressure liquid state refrigerant is gasified into a gas state in the first evaporator 14, and the heat in the room is absorbed in the gasification process, so that the indoor temperature is reduced;
s3, when the temperature detecting piece 15 detects that the temperature of the condenser 12 exceeds the preset temperature, the liquid cooled in the heat preservation box 21 is pumped and sprayed on the condenser 12 through the liquid pumping assembly 25, the condenser 12 is cooled until the temperature of the condenser 12 is lower than the preset temperature, and therefore the situations that the temperature of the condenser 12 is too high and heat cannot be discharged normally, and the air conditioning system is stopped in a protective mode can be avoided.
It should be understood that the typical extreme high temperature situation only occurs for several hours from noon to afternoon, so that by refrigerating the liquid in the heat-preserving box 21 in advance in the afternoon, the liquid in the heat-preserving box 21 stores cold energy, and in noon and afternoon, the cold energy stored in the heat-preserving box 21 is utilized to cool the condenser 12, so that the condenser 12 is prevented from being stopped due to overhigh temperature, and the capability of the air conditioner to cope with extreme high temperature weather is improved.
In addition, the main refrigeration mechanism 1 further includes a second control valve 16, one end of the second control valve 16 is communicated with the other end of the condenser 12, the other end of the second control valve 16 is communicated with one end of the first expansion valve 13, in step S1, both the second control valve 16 and the second control valve 16 may be opened or closed, when the second control valve 16 is opened, the air conditioner cools the liquid stored in the heat preservation tank 21 while actually cooling the room, and when the second control valve 16 is closed, the air conditioner cools the liquid stored in the heat preservation tank 21 only, and whether the second control valve 16 is opened or not depends on whether the user needs to cool the room with the air conditioner in the process of cooling the liquid in the heat preservation tank 21.
In order to specifically implement the function of the liquid-extracting assembly 25, referring to fig. 1 and 2, in a preferred embodiment, the liquid-extracting assembly 25 includes a liquid-extracting pump 251, a liquid-extracting tube 252 and a spray nozzle 253, wherein an inlet of the liquid-extracting pump 251 is communicated with the thermal insulation box 21, an outlet of the liquid-extracting pump 251 is communicated with one end of the liquid-extracting tube 252, the other end of the liquid-extracting tube 252 is communicated with the spray nozzle 253, and the spray nozzle 253 is disposed towards the condenser 12. When the temperature detecting member 15 detects that the temperature of the condenser 12 exceeds the preset temperature in use, the liquid cooled in the heat preservation box 21 is pumped to the spray head 253 by the liquid pumping pump 251, and then sprayed on the condenser 12 by the spray head 253 to cool the condenser 12.
In order to realize the recycling of the liquid, referring to fig. 1 and 2, in a preferred embodiment, the condenser cooling mechanism 2 further includes a liquid receiving box 26 and a return pipe 27, the liquid receiving box 26 is disposed below the condenser 12, one end of the return pipe 27 is communicated with the liquid receiving box 26, the other end of the return pipe 27 is communicated with the insulation box 21, in use, the spray head 253 sprays the liquid onto the condenser 12 to cool the condenser 12, then the liquid flows down into the liquid receiving box 26 below and flows back into the insulation box 21 from the return pipe 27, thereby realizing the recycling of the liquid, meanwhile, in order to prevent the heat preservation effect of the insulation box 21 from being affected, the return pipe 27 is further provided with a return valve, only when the liquid needs to flow back, the return valve is opened, thereby keeping the inside of the insulation box and the outside air as stable as possible, and the insulation box 21 is further provided with a ventilation valve for keeping the pressure in the insulation box 21 stable.
In order to supplement the heat insulation box 21 with liquid, referring to fig. 1 and 2, in a preferred embodiment, the condenser cooling mechanism 2 further includes a liquid supplementing pipe 28 and a liquid supplementing valve 29, one end of the liquid supplementing pipe 28 is communicated with the heat insulation box 21, the other end of the liquid supplementing pipe 28 is communicated with a water source (such as a tap water pipe), the liquid supplementing valve 29 is disposed on the liquid supplementing pipe 28, and when in use, the liquid supplementing valve 29 is opened to supplement water to the heat insulation box 21, so that liquid reduction caused by evaporation and other factors can be supplemented.
In order to ensure stable supply of the refrigerant in the refrigeration system, referring to fig. 1 and 2, in a preferred embodiment, the main refrigeration mechanism 1 further includes a liquid storage tank 17, an upper end of the liquid storage tank 17 is communicated with the other end of the condenser 12, and a lower end of the liquid storage tank 17 is communicated with one end of the first expansion valve 13 and one end of the second expansion valve 23.
In order to facilitate the drying and filtering of the refrigerant, referring to fig. 1 and 2, in a preferred embodiment, the main refrigeration mechanism 1 further includes a dryer 18, one end of the dryer 18 is connected to the lower end of the liquid storage tank 17, and the other end of the dryer 18 is connected to one end of the first expansion valve 13 and one end of the second expansion valve 23.
In order to improve the conditioning efficiency of the air conditioning system, referring to fig. 1 and 2, in a preferred embodiment, the main refrigeration mechanism 1 further includes a heat exchanger 19, a first medium inlet of the heat exchanger 19 is connected to the other end of the dryer 18, a first medium outlet of the heat exchanger 19 is connected to one end of the first expansion valve 13 and one end of the second expansion valve 23, a second medium inlet of the heat exchanger 19 is connected to the other end of the first evaporator 14 and the other end of the second evaporator 24, a second medium outlet of the heat exchanger 19 is connected to the inlet of the compressor 11, and since the temperature of the refrigerant discharged from the first evaporator 14 and the second evaporator 24 is relatively low, the temperature of the refrigerant discharged from the condenser can be reduced by providing the heat exchanger 19, and the temperature of the subsequent refrigerant entering the first evaporator 14 and the second evaporator 24 can be lower, thereby improving the heat absorption efficiency of the air conditioning system in the first evaporator 14 and the second evaporator 24.
In order to perform low pressure protection on the compressor 11, referring to fig. 1, in a preferred embodiment, the main refrigeration mechanism 1 further includes a protection component 110, where the protection component 110 includes an inlet pressure detecting element 111, an outlet pressure detecting element 112, a bypass pipe 113 and a bypass valve 114, the inlet pressure detecting element 111 is used for detecting the pressure of the inlet of the compressor 11, the outlet pressure detecting element 112 is used for detecting the pressure of the outlet of the compressor 11, one end of the bypass pipe 113 is communicated with the inlet of the compressor 11, the other end of the bypass pipe 113 is communicated with the outlet of the compressor 11, and the bypass valve 114 is disposed on the bypass pipe 113, and when the pressure at the inlet of the compressor 11 is lower than a preset value, the bypass valve 114 is opened, so that the compressed refrigerant returns to the inlet of the compressor 11, thereby increasing the pressure at the inlet of the compressor 11, and preventing the compressor 11 from being shut down due to low pressure protection caused by the too low pressure at the inlet of the compressor 11.
In order to prevent the refrigerant from flowing backwards, referring to fig. 1, in a preferred embodiment, the main refrigeration unit 1 further includes a check valve 115, an inlet of the check valve 115 is in communication with an outlet of the compressor 11, and an outlet of the check valve 115 is in communication with one end of the condenser 12.
The invention also provides a control method of the direct expansion air conditioning system, which is suitable for the direct expansion air conditioning system and comprises the following steps:
s1, starting a compressor 11 and a first control valve 22 in a preset time (for example, 4 hours) before the arrival of an extremely high temperature is predicted, compressing a refrigerant into a high-pressure gas state by the compressor 11, discharging the gas into a condenser 12, discharging the high-pressure gas-state refrigerant into a high-pressure liquid state by the high-pressure gas-state refrigerant after heat release in the condenser 12, enabling the high-pressure liquid-state refrigerant to enter a second expansion valve 23, enabling the high-pressure liquid-state refrigerant to be converted into a low-pressure liquid state by the second expansion valve 23, enabling the low-pressure liquid-state refrigerant to enter a second evaporator 24, enabling the low-pressure liquid-state refrigerant to be gasified into a gas state in the second evaporator 24, absorbing heat in an insulation box 21 in the gasification process, and enabling the liquid temperature in the insulation box 21 to be reduced until the liquid temperature in the insulation box 21 is lower than the preset temperature;
s2, when the temperature is extremely high, the compressor 11 is started, the first control valve 22 is closed, the compressor 11 compresses the refrigerant into a high-pressure gas state and then discharges the high-pressure gas state into the condenser 12, the high-pressure gas state refrigerant releases heat in the condenser 12 and then becomes a high-pressure liquid state, the high-pressure liquid state refrigerant then enters the first expansion valve 13, the first expansion valve 13 enables the high-pressure liquid state refrigerant to be converted into a low-pressure liquid state, the low-pressure liquid state refrigerant enters the first evaporator 14 arranged in a room, the low-pressure liquid state refrigerant is gasified into a gas state in the first evaporator 14, and the heat in the room is absorbed in the gasification process, so that the indoor temperature is reduced;
s3, when the temperature detecting piece 15 detects that the temperature of the condenser 12 exceeds the preset temperature, the liquid cooled in the heat preservation box 21 is pumped and sprayed on the condenser 12 through the liquid pumping component 25, the temperature of the condenser 12 is reduced until the temperature of the condenser 12 is lower than the preset temperature, so that the conditions that the temperature of the condenser 12 is too high and heat cannot be discharged normally, and the air conditioning system is stopped in a protective mode can be avoided, and the capacity of the air conditioner for coping with extremely high temperature weather is improved.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the technical scope of the present invention should be included in the scope of the present invention.
Claims (10)
1. A direct expansion air conditioning system, comprising:
the main refrigeration mechanism comprises a compressor, a condenser, a first expansion valve, a first evaporator and a temperature detection piece, wherein an outlet of the compressor is communicated with one end of the condenser, the other end of the condenser is communicated with one end of the first expansion valve, the other end of the first expansion valve is communicated with one end of the first evaporator, the other end of the first evaporator is communicated with an inlet of the compressor, and the temperature detection piece is used for detecting the temperature of the condenser; the method comprises the steps of,
the condenser cooling mechanism comprises an insulation box, a first control valve, a second expansion valve, a second evaporator and a liquid pumping assembly, wherein liquid is stored in the insulation box, one end of the first control valve is communicated with the other end of the condenser, the other end of the first control valve is communicated with one end of the second expansion valve, the other end of the second expansion valve is communicated with one end of the second evaporator, the other end of the second evaporator is communicated with an inlet of the compressor, the second evaporator is arranged in the insulation box, and the liquid pumping assembly is used for pumping and spraying liquid in the insulation box on the condenser.
2. The direct expansion air conditioning system according to claim 1, wherein the liquid extraction assembly comprises a liquid extraction pump, a liquid extraction pipe and a spray head, an inlet of the liquid extraction pump is communicated with the heat insulation box, an outlet of the liquid extraction pump is communicated with one end of the liquid extraction pipe, the other end of the liquid extraction pipe is communicated with the spray head, and the spray head is arranged towards the condenser.
3. The direct expansion air conditioning system according to claim 1, wherein the condenser cooling mechanism further comprises a liquid receiving box and a return pipe, the liquid receiving box is arranged below the condenser, one end of the return pipe is communicated with the liquid receiving box, and the other end of the return pipe is communicated with the heat insulation box.
4. The direct expansion air conditioning system according to claim 1, wherein the condenser cooling mechanism further comprises a liquid supplementing pipe and a liquid supplementing valve, one end of the liquid supplementing pipe is communicated with the insulation can, the other end of the liquid supplementing pipe is communicated with a water source, and the liquid supplementing valve is arranged on the liquid supplementing pipe.
5. The direct expansion air conditioning system according to claim 1, wherein the main refrigeration mechanism further comprises a liquid storage tank, an upper end of the liquid storage tank is communicated with the other end of the condenser, and a lower end of the liquid storage tank is communicated with one end of the first expansion valve and one end of the second expansion valve.
6. The direct expansion air conditioning system according to claim 5, wherein the main refrigeration mechanism further comprises a dryer, one end of the dryer is communicated with the lower end of the liquid storage tank, and the other end of the dryer is communicated with one end of the first expansion valve and one end of the second expansion valve.
7. The direct expansion air conditioning system according to claim 6, wherein the main refrigeration mechanism further comprises a heat exchanger, a first medium inlet of the heat exchanger is communicated with the other end of the dryer, a first medium outlet of the heat exchanger is communicated with one end of the first expansion valve and one end of the second expansion valve, a second medium inlet of the heat exchanger is communicated with the other end of the first evaporator and the other end of the second evaporator, and a second medium outlet of the heat exchanger is communicated with the inlet of the compressor.
8. The direct expansion air conditioning system according to claim 1, wherein the main refrigeration mechanism further comprises a protection assembly including an inlet pressure detecting member for detecting the pressure of the inlet of the compressor, an outlet pressure detecting member for detecting the pressure of the outlet of the compressor, a bypass pipe having one end in communication with the inlet of the compressor and the other end in communication with the outlet of the compressor, and a bypass valve provided on the bypass pipe.
9. The direct expansion air conditioning system according to claim 1, wherein the main refrigeration mechanism further comprises a one-way valve, an inlet of the one-way valve being in communication with an outlet of the compressor, an outlet of the one-way valve being in communication with one end of the condenser.
10. A control method of a direct expansion air conditioning system, which is applied to the direct expansion air conditioning system according to any one of claims 1 to 9, comprising the steps of:
s1, starting a compressor and a first control valve in a preset time before the arrival of extreme high temperature is predicted, compressing a refrigerant into a high-pressure gas state by the compressor, then discharging the high-pressure gas state into a condenser, discharging the high-pressure gas state refrigerant into a high-pressure liquid state after heat release in the condenser, enabling the high-pressure liquid state refrigerant to enter a second expansion valve, enabling the high-pressure liquid state refrigerant to be converted into a low-pressure liquid state by the second expansion valve, enabling the low-pressure liquid state refrigerant to enter a second evaporator, enabling the low-pressure liquid state refrigerant to be gasified into a gas state in the second evaporator, absorbing heat in an insulation box in the gasification process, and enabling the temperature of liquid in the insulation box to be reduced until the temperature of the liquid in the insulation box is lower than the preset temperature;
s2, when the temperature is extremely high, the compressor is started, the first control valve is closed, the compressor compresses the refrigerant into a high-pressure gas state and then discharges the high-pressure gas state into the condenser, the high-pressure gas state refrigerant is changed into a high-pressure liquid state after releasing heat in the condenser, the high-pressure liquid state refrigerant then enters the first expansion valve, the first expansion valve enables the high-pressure liquid state refrigerant to be changed into a low-pressure liquid state, the low-pressure liquid state refrigerant enters the first evaporator arranged in the chamber, in the first evaporator, the low-pressure liquid state refrigerant is gasified into a gas state, heat in the chamber is absorbed in the gasification process, and the indoor temperature is reduced;
and S3, when the temperature detection part detects that the temperature of the condenser exceeds the preset temperature, sucking and spraying the refrigerated liquid in the heat insulation box on the condenser through the liquid sucking component, and cooling the condenser until the temperature of the condenser is lower than the preset temperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311388539.4A CN117433172A (en) | 2023-10-24 | 2023-10-24 | Direct expansion type air conditioning system and control method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311388539.4A CN117433172A (en) | 2023-10-24 | 2023-10-24 | Direct expansion type air conditioning system and control method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117433172A true CN117433172A (en) | 2024-01-23 |
Family
ID=89547457
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311388539.4A Pending CN117433172A (en) | 2023-10-24 | 2023-10-24 | Direct expansion type air conditioning system and control method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117433172A (en) |
-
2023
- 2023-10-24 CN CN202311388539.4A patent/CN117433172A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| USRE39924E1 (en) | Refrigeration system with modulated condensing loops | |
| US8408022B2 (en) | Hybrid cascade vapor compression refrigeration system | |
| JP3609096B2 (en) | Combined cooling system for water cooling and heat storage | |
| US20020033024A1 (en) | Utilization of harvest and/or melt water from an ice machine for a refrigerant subcool/precool system and method therefor | |
| US7401473B2 (en) | Dual refrigerant refrigeration system and method | |
| CA2543026C (en) | Heat reclaim refrigeration system and method | |
| KR20100027353A (en) | Refrigerating and freezing apparatus | |
| WO1990014566A1 (en) | Refrigeration and freezing plant | |
| US20210215410A1 (en) | Cooling system with flooded low side heat exchangers | |
| CN117553441A (en) | Refrigerating system and control method thereof | |
| CN111594962A (en) | Fluorine pump energy-saving indirect evaporative cooling air conditioning unit and control method | |
| CN117433172A (en) | Direct expansion type air conditioning system and control method thereof | |
| CN213873261U (en) | Mixed refrigerating system for data center | |
| CN213514206U (en) | Energy-saving indirect evaporative cooling air conditioning unit with fluorine pump | |
| CN209978429U (en) | Heat pump air conditioning unit capable of controlling temperature of lubricating oil | |
| CN210128524U (en) | Multistage heat exchange air-cooling heat dissipation system for built-in display cabinet | |
| JP3307803B2 (en) | Cooling device | |
| JP2001349655A (en) | Cooling device | |
| CN214620154U (en) | Two-phase flow air conditioning system with free cooling function | |
| CN218955263U (en) | Refrigerator device integrating refrigeration and freezing | |
| CN219693611U (en) | Military air conditioner refrigerating system capable of refrigerating in large temperature area | |
| CN212842303U (en) | Air conditioner | |
| CN220355780U (en) | Low-temperature vortex type air-cooled compression condensing unit with defrosting function | |
| CN212108872U (en) | Refrigeration fresh air conditioning unit with indirect evaporation composite compressor | |
| CN218722376U (en) | Power type heat pipe integrated air conditioning system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |