CN110925940B - Air supply control method of two-stage compression air supply air conditioning system - Google Patents
Air supply control method of two-stage compression air supply air conditioning system Download PDFInfo
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- CN110925940B CN110925940B CN201911085264.0A CN201911085264A CN110925940B CN 110925940 B CN110925940 B CN 110925940B CN 201911085264 A CN201911085264 A CN 201911085264A CN 110925940 B CN110925940 B CN 110925940B
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- 230000006835 compression Effects 0.000 title claims abstract description 27
- 238000007906 compression Methods 0.000 title claims abstract description 27
- 238000004378 air conditioning Methods 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title claims abstract description 18
- 230000001502 supplementing effect Effects 0.000 claims abstract description 20
- 238000001704 evaporation Methods 0.000 claims abstract description 14
- 239000003507 refrigerant Substances 0.000 claims description 40
- 238000001514 detection method Methods 0.000 claims description 36
- 238000001816 cooling Methods 0.000 claims description 22
- 238000005057 refrigeration Methods 0.000 claims description 20
- 238000010438 heat treatment Methods 0.000 claims description 13
- 238000010025 steaming Methods 0.000 claims description 9
- 239000013589 supplement Substances 0.000 abstract description 51
- 230000008020 evaporation Effects 0.000 abstract description 7
- 239000007788 liquid Substances 0.000 abstract description 4
- 238000002347 injection Methods 0.000 description 10
- 239000007924 injection Substances 0.000 description 10
- 238000010586 diagram Methods 0.000 description 5
- 230000017525 heat dissipation Effects 0.000 description 5
- 229920006395 saturated elastomer Polymers 0.000 description 4
- 239000000243 solution Substances 0.000 description 3
- 239000002826 coolant Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 101100314150 Caenorhabditis elegans tank-1 gene Proteins 0.000 description 1
- 238000010977 unit operation 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
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
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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
- F24F11/62—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
- F24F11/65—Electronic processing for selecting an operating mode
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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
- F24F11/70—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
- F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
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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
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/31—Expansion valves
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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
- F25B49/022—Compressor control arrangements
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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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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2140/00—Control inputs relating to system states
- F24F2140/20—Heat-exchange fluid temperature
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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
- F25B2500/00—Problems to be solved
- F25B2500/28—Means for preventing liquid refrigerant entering into the compressor
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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)
- Signal Processing (AREA)
- Thermal Sciences (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention provides a gas supplementing control method of a two-stage compression gas supplementing air conditioning system, relates to the technical field of air conditioners, and solves the technical problem that the gas supplementing quantity of the existing flash tank gas supplementing mode cannot be adjusted according to working conditions. The air supply control method controls the opening degree of the first valve body by detecting the outdoor environment temperature, the air suction temperature of the compressor, the temperature of the outer pipe of the outer machine and the temperature of the evaporation pipe of the inner machine and calculating the air suction superheat degree according to the temperature values. The opening and closing of the first valve body are determined according to the outdoor environment temperature, and the opening degree of the first valve body is controlled according to the suction superheat degree in the opening state, so that the purpose of adjusting the air supplement amount according to the working condition is achieved, the condition that the compressor is damaged due to liquid supplement caused by over air supplement is avoided, and the flexibility and the reliability of the compressor are improved.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to an air supply control method of a double-stage compression air supply air conditioning system.
Background
The higher the outdoor ambient temperature, the greater the room refrigeration demand load. Under the high temperature environment temperature, the higher the temperature, the larger the capacity attenuation, which affects the comfort of users. Usually, a double-stage compression gas injection enthalpy compensation mode is adopted for solving the problem, but a one-stage throttling and two-stage throttling scheme is adopted for gas compensation in the traditional flash tank gas compensation scheme, the gas compensation amount cannot be accurately controlled, and the phenomenon that the compressor is damaged due to liquid compensation caused by gas compensation easily occurs. Particularly, in hot or cold areas with large indoor and outdoor temperature difference, a novel compressor air supply mode is urgently needed to be researched.
In addition, the heat dissipation of the electric box is difficult in a high-temperature environment, the conventional air cooling heat dissipation effect is poor, and the electric box needs to be placed in an air field, namely, the installation position of the electric box is required.
Disclosure of Invention
The invention aims to provide a gas supplementing control method of a two-stage compression gas supplementing air conditioning system, which aims to solve the technical problem that the gas supplementing quantity of a flash tank gas supplementing mode in the prior art cannot be adjusted according to working conditions. The technical effects that can be produced by the preferred technical scheme in the technical schemes provided by the invention are described in detail in the following.
In order to achieve the purpose, the invention provides the following technical scheme:
the invention provides a two-stage compression air supplement device which comprises a flash tank, an air supplement pipeline and a temperature detection device, wherein the flash tank is communicated with an air supplement port of a compressor through the air supplement pipeline, and a first valve body is arranged in the air supplement pipeline; the temperature detection device can at least detect the outdoor environment temperature TOuter ringSuction temperature T of compressorSuction deviceOuter tube temperature T of outer machineOuter tubeAnd the inner machine evaporating pipe temperature TSteaming pipeAnd calculating the degree of superheat of the sucked air according to the temperature value so as to control the opening degree of the first valve body.
Optionally, the temperature detecting device includes an outer ring detecting unit for detecting an outdoor ambient temperature, an air suction detecting unit for detecting an air suction temperature of the compressor, an outer tube detecting unit for detecting an outer tube temperature of the outer machine, and a evaporating tube detecting unit for detecting an evaporating tube temperature of the inner machine.
Optionally, the air suction detection unit is an air suction temperature sensing bulb arranged at an air suction port of the compressor.
Optionally, an exhaust temperature adjusting pipeline is arranged between the flash tank and the evaporator, and a second valve body is arranged in the exhaust temperature adjusting pipeline; and the temperature detection device can also detect the exhaust temperature T of the compressorRow boardAnd calculating the exhaust superheat degree according to the temperature value to control the opening degree of the second valve body.
Optionally, the temperature detection device further comprises an exhaust gas detection unit for detecting the exhaust gas temperature of the compressor.
Optionally, the exhaust detection unit is an exhaust temperature sensing bulb arranged at an exhaust port of the compressor.
Optionally, the first valve body and the second valve body are both electronic expansion valves.
The invention provides an air conditioning system which comprises a compressor, an evaporator, a condenser and any one of the two-stage compression air supplementing devices.
Optionally, the air conditioning system further comprises a four-way valve, a first port of the four-way valve is connected to an outlet of the evaporator, a second port of the four-way valve is connected to an air inlet of the compressor, a third port of the four-way valve is connected to an air outlet of the compressor, and a fourth port of the four-way valve is connected to an inlet of the condenser.
Optionally, the air conditioning system further includes a refrigerant cooling device disposed between the condenser and the flash tank.
Optionally, a third valve is disposed in a pipeline between the refrigerant cooling device and the condenser.
The invention provides a gas supplementing control method of an air conditioning system, which comprises the following steps:
in the cooling mode:
A. the temperature detection device detects the outdoor ambient temperature TOuter ringWhen T isOuter ring<Refrigeration patchUpper limit of gas ambient temperature T１The first valve body is closed;
B. the temperature detection device detects the outdoor ambient temperature TOuter ringWhen T isOuter ring>Lower limit environment temperature T for refrigeration and air supply2Opening the first valve body;
C. the temperature detection device detects the suction temperature T of the compressorSuction deviceAnd the temperature T of the evaporator tube of the internal machineSteaming pipeCalculating actually measured air suction superheat degree delta TSuction device=TSuction device-TSteaming pipeComparison of Δ TSuction deviceThe degree of superheat of the air sucked by the target is adjusted, and the opening degree of the first valve body is adjusted until delta TSuction deviceA value close to the target suction superheat;
in the heating mode:
a', a temperature detection device for detecting outdoor environment temperature TOuter ringWhen T isOuter ring>Lower limit environment temperature T for heating and air supply4The first valve body is closed;
b', a temperature detection device for detecting the outdoor environment temperature TOuter ringWhen T isOuter ring<Heating air supply upper limit environment temperature T3Opening the first valve body;
c' temperature detector for detecting suction temperature T of compressorSuction deviceAnd outer tube temperature T of outer machineOuter tubeCalculating actually measured air suction superheat degree delta TSuction device=TSuction device-TOuter tubeComparison of Δ TSuction deviceThe degree of superheat of the air sucked by the target is adjusted, and the opening degree of the first valve body is adjusted until delta TSuction deviceIs close to the target suction superheat.
According to the air supplement control method of the two-stage compression air supplement air conditioning system, the first valve body is arranged in the air supplement pipeline of the two-stage compression air supplement device, the outdoor environment temperature, the air suction temperature of the compressor, the temperature of the outer pipe of the outer machine and the temperature of the evaporation pipe of the inner machine are detected through the temperature detection device, the opening and the closing of the first valve body are determined according to the outdoor environment temperature, and the opening degree of the first valve body is controlled according to the air suction superheat degree in the opening state, so that the purpose of adjusting the air supplement amount according to the working condition is achieved, the situation that the compressor is damaged due to liquid supplement caused by over air supplement is avoided, and the flexibility and the reliability of the.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of a high temperature enthalpy injection refrigeration system (chiller) according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a high temperature enthalpy injection refrigeration system (heat pump) according to an embodiment of the present invention;
fig. 3 is a schematic view of a high-temperature enthalpy injection refrigeration system (single-cooler) with a refrigerant pipe for heat dissipation according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a high-temperature enthalpy-injection refrigeration system (heat pump) with refrigerant pipes for heat dissipation according to an embodiment of the present invention;
FIG. 5 is a logic diagram of the air make-up control.
In figure 1, flash tank; 2. a compressor; 3. an evaporator; 4. a condenser; 5. a gas-suction temperature sensing bulb; 6. an exhaust temperature sensing bulb; 7. a four-way valve; 8. refrigerant pipe cooling device.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.
The invention provides a two-stage compression air supplementing device which comprises a flash tank 1, an air supplementing pipeline and a temperature detection device, wherein the flash tank1 is communicated with an air supplement port of a compressor 2 through an air supplement pipeline, and an electronic expansion valve EXV1 serving as a first valve body is arranged in the air supplement pipeline; the temperature detection device can at least detect the outdoor environment temperature TOuter ringThe suction temperature T of the compressor 2Suction deviceOuter tube temperature T of outer machineOuter tubeAnd the inner machine evaporating pipe temperature TSteaming pipeAnd calculates the degree of superheat of the suction gas based on the temperature value to control the opening degree of the electronic expansion valve EXV 1.
The outdoor environment temperature, the air suction temperature of the compressor 2, the temperature of the outer pipe of the outer machine and the temperature of the evaporation pipe of the inner machine are detected by the temperature detection device, the opening and the closing of the electronic expansion valve EXV1 are determined according to the outdoor environment temperature, the opening degree of the electronic expansion valve EXV1 is controlled according to the air suction superheat degree in the opening state, the electronic expansion valve EXV1 mainly controls the air supply amount, the purpose of adjusting the air supply amount according to the working condition is achieved, the situation that the compressor 2 is damaged due to liquid supply caused by excessive air supply is avoided, and the flexibility and the reliability of the compressor 2 are improved.
As an alternative embodiment, an exhaust temperature adjusting pipeline is arranged between the flash tank 1 and the evaporator 3, and an electronic expansion valve EXV2 serving as a second valve body is arranged in the exhaust temperature adjusting pipeline; and the temperature detection device can also detect the exhaust temperature Trow of the compressor 2 and calculate the exhaust superheat degree according to the temperature value so as to control the opening degree of the electronic expansion valve EXV 2.
The electronic expansion valve EXV2 can be arranged to control the exhaust temperature conveniently to approach the target exhaust temperature.
When air supply control is required, the air supply electronic expansion valve EXV1 is controlled according to the target suction superheat degree (or target suction temperature); the electronic expansion valve EXV2 is controlled in accordance with a target exhaust gas temperature (or exhaust gas superheat).
When air supplement is not needed, the steps of the air supplement electronic expansion valve EXV1 can be directly closed to the minimum.
The air supplement control logic diagram is shown in fig. 5. Firstly checking the unit operation mode and the outdoor environment temperature,
if the detection is a cooling operation mode:
when the outdoor environment temperature T is detectedOuter ringLower than upper limit ambient temperature T for refrigeration and air supply1When the environment temperature is low, the refrigeration load of the room is low, and air supplement is not needed, the air supplement electronic expansion valve EXV1 is closed;
when the outdoor environment temperature T is detectedOuter ringHigher than lower limit environment temperature T for refrigeration and air supply2When the air conditioner system is used, the ambient temperature is high, the refrigeration load of a room is high, the air supply electronic expansion valve EXV1 needs to be opened for adjustment, the adjusted target parameter is adjusted according to the suction superheat degree, corresponding different target exhaust superheat degrees are given in different ambient temperature intervals, and the air conditioner system detects the suction temperature TSuction deviceAnd the temperature T of the 3 tubes of the evaporator of the inner machineSteaming pipeTo calculate the actually measured suction superheat degree delta T of the air conditionerSuction device=TSuction device-TSteaming pipe. According to the actually measured suction superheat degree delta TSuction deviceComparing with the target air suction superheat degree, and when the actually measured air suction superheat degree is lower, the opening step number of the air supply electronic expansion valve is reduced; when the actually measured air suction superheat degree is higher, the opening step number of the air supply electronic expansion valve is increased until the air suction superheat degree is close to the target air suction superheat degree. Wherein T1 is less than or equal to T2.
If the detection is the heating operation mode:
when the outdoor environment temperature T is detectedOuter ringHigher than lower limit environment temperature T for heating and air supply4When the environment temperature is higher, the room heating load is smaller, and air supplement is not needed, the air supplement electronic expansion valve EXV1 is closed;
when the outdoor environment temperature T is detectedOuter ringLower limit of heating and air supply ambient temperature T3When the air conditioner system is used, the ambient temperature is low, the room heating load is large, the air supply electronic expansion valve EXV1 needs to be opened for adjustment, the adjusted target parameter is adjusted according to the air suction superheat degree, corresponding different target exhaust superheat degrees are given in different ambient temperature intervals, and the air conditioner system detects the air suction temperature TSuction deviceTemperature T of outer pipe of outdoor unitOuter tubeTo calculate the actually measured suction superheat degree delta T of the air conditionerSuction device=TSuction device-TOuter tube. According to the actually measured suction superheat degree delta TSuction deviceComparing with the target suction superheat, and supplying air when the actually measured suction superheat is lowerThe opening step number of the expansion valve is small; when the actually measured air suction superheat degree is higher, the opening step number of the air supply electronic expansion valve is increased until the air suction superheat degree is close to the target air suction superheat degree. Wherein T3 is less than or equal to T4.
The invention provides a double-stage compression air supply air conditioning system which comprises any one of the double-stage compression air supply devices.
Example 1:
as shown in fig. 1, the present invention provides a high-temperature enthalpy injection refrigeration system (single-cold machine), which comprises an evaporator 3, a condenser 4, a compressor 2, a flash tank 1, an electronic expansion valve EXV1 and an electronic expansion valve EXV2, as well as an exhaust bulb 6 and an intake bulb 5. Wherein the flash tank 1 is arranged between the evaporator 3 and the condenser 4, the electronic expansion valve EXV1 mainly controls the air supplement amount, one end of the electronic expansion valve is connected to the outlet of the flash tank 1, and the other end of the electronic expansion valve is connected to the air supplement port of the compressor 2; the EXV2 primarily controls the discharge temperature and has one end connected to the outlet of the flash tank 1 and the other end connected to the inlet of the evaporator 3.
When air supply control is required, the air supply electronic expansion valve EXV1 is controlled according to the target suction superheat degree (or target suction temperature); the electronic expansion valve EXV2 is controlled in accordance with a target exhaust gas temperature (or exhaust gas superheat).
When the compressor 2 operates for refrigeration, a high-temperature and high-pressure refrigerant discharged by the compressor 2 is cooled by the condenser 4 and flows into the flash tank 1, and one path of steam from the flash tank 1 flows to an air supplement port of the compressor 2 after the air supplement amount is controlled by an air supplement electronic expansion valve EXV 1; the other path of the subcooled refrigerant from the flash tank 1 flows to an electronic expansion valve EXV2 for throttling, flows into the evaporator 3 for evaporation after throttling, then returns to the compressor 2 for compression, and circulates in a reciprocating manner.
When air supplement is not needed, the air supplement electronic expansion valve EXV1 is directly closed.
Example 2:
embodiment 2 differs from embodiment 1 in that a four-way valve 7 and a third valve body (electronic expansion valve EXV 3) are added.
As shown in fig. 2, the present invention provides a high temperature enthalpy injection refrigeration system (heat pump machine) comprising an evaporator 3, a condenser 4, a compressor 2, a flash tank 1, a four-way valve 7, three electronic expansion valves EXV1, EXV2 and EXV3, an exhaust bulb 6 and an intake bulb 5.
During refrigerating operation: the cooled refrigerant from the outlet of the condenser 4 flows into the flash tank 1 after passing through an EXV3, and one path of steam from the flash tank 1 flows into an air supplement port of the compressor 2 after the air supplement amount is controlled by an air supplement electronic expansion valve EXV 1; the other path of the subcooled refrigerant from the flash tank 1 flows into the EXV2 to be throttled, the throttled saturated refrigerant flows into the evaporator 3 to be evaporated, the refrigerant evaporated from the evaporator 3 flows into the compressor 2 to be subjected to the compressor 2, and the cycle is repeated.
During heating operation: high-temperature and high-pressure refrigerant vapor discharged by the compressor 2 flows into the indoor evaporator 3 for cooling, the cooled refrigerant flows to the flash tank 1 after flowing through the electronic expansion valve EXV2, and one path of vapor from the flash tank 1 flows into an air supplement port of the compressor 2 after passing through the air supplement electronic expansion valve EXV1 for air supplement amount control; the other refrigerant from the flash tank 1 flows to an electronic expansion valve EXV3 for throttling, and the throttled saturated refrigerant enters an outdoor condenser 4 for evaporation and then flows to a compressor 2, and the cycle is repeated.
If no air make-up is required, electronic expansion valve EXV1 is directly closed.
Example 3:
as shown in fig. 3, the present invention provides a high-temperature enthalpy injection refrigeration system (single-cooler) with cooling medium pipe cooling, and compared with embodiment 1, a cooling medium pipe cooling device 8 is added.
The high-temperature enthalpy injection refrigeration system comprises an evaporator 3, a condenser 4, a compressor 2, a flash tank 1, a refrigerant pipe cooling device 8, electronic expansion valves EXV1 and EXV2, an exhaust temperature sensing bulb 6 and an intake temperature sensing bulb 5. The cooling device 8 of the refrigerant pipe is arranged on an outlet pipe of the condenser 4, the electronic expansion valve EXV1 mainly controls the air supplement amount, one end of the electronic expansion valve is connected to an outlet of the flash tank 1, and the other end of the electronic expansion valve is connected to an air supplement port of the compressor 2; EXV2 mainly controls exhaust temperature, and has one end connected to the outlet of flash tank 1 and the other end connected to the inlet pipe of evaporator 3
When air supply control is required, the air supply electronic expansion valve EXV1 is controlled according to the target suction superheat degree (or target suction temperature); the electronic expansion valve EXV2 is controlled in accordance with a target exhaust gas temperature (or exhaust gas superheat).
When the compressor 2 operates for refrigeration, high-temperature and high-pressure refrigerant discharged by the compressor 2 is cooled by the condenser 4 and flows into the refrigerant pipe cooling device 8 for heat exchange, then flows into the flash tank 1, and one path of steam from the flash tank 1 flows to the air supplement port of the compressor 2 after the air supplement amount is controlled by the air supplement electronic expansion valve EXV 1; the other path of the subcooled refrigerant from the flash tank 1 flows to an electronic expansion valve EXV2 for throttling, flows into the evaporator 3 for evaporation after throttling, then returns to the compressor 2 for compression, and circulates in a reciprocating manner.
When air supplement is not needed, the air supplement electronic expansion valve EXV1 is directly closed.
The cooling of refrigerant pipe is used for actively dissipating heat of the electric appliance box, the electric appliance box does not need to be placed in an air field, the installation is convenient, the heat dissipation efficiency is high, the temperature of the whole electric appliance box is stable, and the stable work of electric appliance components is facilitated.
Example 4:
As shown in fig. 4, the present invention provides a high temperature enthalpy injection refrigeration system (single-cold machine) with refrigerant pipe cooling, which comprises an evaporator 3, a condenser 4, a compressor 2, a flash tank 1, a four-way valve 7, a refrigerant pipe cooling device 8, three electronic expansion valves EXV1, EXV2 and EXV3, an exhaust temperature sensing bulb 6 and an intake temperature sensing bulb 5.
During refrigerating operation: the cooled refrigerant from the outlet of the condenser 4 is not throttled after passing through an EXV3 (full open), the refrigerant flows into the refrigerant pipe cooling device 8 again, the refrigerant flows into the flash tank 1 after exchanging heat with the electric control box, and one path of refrigerant steam from the flash tank 1 flows into the air supplement port of the compressor 2 after controlling the air supplement amount through an air supplement electronic expansion valve EXV 1; the other path of the subcooled refrigerant from the flash tank 1 flows into the EXV2 to be throttled, the throttled saturated refrigerant flows into the evaporator 3 to be evaporated, the refrigerant evaporated from the evaporator 3 flows into the compressor 2 to be subjected to the compressor 2, and the cycle is repeated.
During heating operation: high-temperature and high-pressure refrigerant vapor discharged by the compressor 2 flows into the indoor evaporator 3 for cooling, the cooled refrigerant flows through the electronic expansion valve EXV2 (fully open) without throttling and then flows to the flash tank 1, and one path of vapor from the flash tank 1 flows into an air supplement port of the compressor 2 after being subjected to air supplement amount control through the air supplement electronic expansion valve EXV 1; the other path of refrigerant from the flash tank 1 flows to the refrigerant pipe cooling device 8, the refrigerant after heat exchange with the electronic control box flows into the electronic expansion valve EXV3 for throttling, the throttled saturated refrigerant enters the outdoor condenser 4 for evaporation, then flows to the compressor 2, and the cycle is repeated.
If no air make-up is required, electronic expansion valve EXV1 is directly closed.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. The air supplementing control method of the double-stage compression air supplementing air conditioning system is characterized in that the air conditioning system comprises a compressor, an evaporator, a condenser and a double-stage compression air supplementing device; the double-stage compression air supplementing device comprises a flash tank, an air supplementing pipeline and a temperature detection device, wherein the flash tank is communicated with an air supplementing port of the compressor through the air supplementing pipeline, and a first valve body is arranged in the air supplementing pipeline; the temperature detection device can at least detect the outdoor environment temperature TOuter ringSuction temperature T of compressorSuction deviceOuter tube temperature T of outer machineOuter tubeAnd the inner machine evaporating pipe temperature TSteaming pipeAnd calculating the degree of superheat of the intake air according to the temperature value to control the opening degree of the first valve body, wherein the control step comprises the following steps:
in the cooling mode:
A. temperature detection deviceMeasuring outdoor ambient temperature TOuter ringWhen T isOuter ring<Upper limit ambient temperature T for refrigeration and air supply1The first valve body is closed;
B. the temperature detection device detects the outdoor ambient temperature TOuter ringWhen T isOuter ring>Lower limit environment temperature T for refrigeration and air supply2Opening the first valve body;
C. the temperature detection device detects the suction temperature T of the compressorSuction deviceAnd the temperature T of the evaporator tube of the internal machineSteaming pipeCalculating actually measured air suction superheat degree delta TSuction device=TSuction device-TSteaming pipeComparison of Δ TSuction deviceThe degree of superheat of the air sucked by the target is adjusted, and the opening degree of the first valve body is adjusted until delta TSuction deviceA value close to the target suction superheat;
in the heating mode:
a', a temperature detection device for detecting outdoor environment temperature TOuter ringWhen T isOuter ring>Lower limit environment temperature T for heating and air supply4The first valve body is closed;
b', a temperature detection device for detecting the outdoor environment temperature TOuter ringWhen T isOuter ring<Heating air supply upper limit environment temperature T3Opening the first valve body;
c' temperature detector for detecting suction temperature T of compressorSuction deviceAnd outer tube temperature T of outer machineOuter tubeCalculating actually measured air suction superheat degree delta TSuction device=TSuction device-TOuter tubeComparison of Δ TSuction deviceThe degree of superheat of the air sucked by the target is adjusted, and the opening degree of the first valve body is adjusted until delta TSuction deviceIs close to the target suction superheat.
2. The air make-up control method for the dual-stage compression air make-up air conditioning system according to claim 1, wherein the temperature detection device comprises an outer ring detection unit for detecting the outdoor ambient temperature, an air suction detection unit for detecting the air suction temperature of the compressor, an outer tube detection unit for detecting the temperature of the outer tube of the outer machine, and a evaporating tube detection unit for detecting the temperature of the evaporating tube of the inner machine.
3. The air make-up control method of the dual-stage compression air make-up air conditioning system according to claim 2, wherein the air suction detection unit is an air suction temperature sensing bulb arranged at an air suction port of the compressor.
4. The air make-up control method of the dual-stage compression air make-up air conditioning system according to any one of claims 1 to 3, wherein an exhaust temperature adjusting pipeline is arranged between the flash tank and the evaporator, and a second valve body is arranged in the exhaust temperature adjusting pipeline; and the temperature detection device can also detect the exhaust temperature T of the compressorRow boardAnd calculating the exhaust superheat degree according to the temperature value to control the opening degree of the second valve body.
5. The air make-up control method of the dual-stage compression air make-up air conditioning system according to claim 4, wherein the temperature detection device further comprises an exhaust detection unit for detecting the exhaust temperature of the compressor.
6. The air make-up control method of the dual-stage compression air make-up air conditioning system according to claim 5, wherein the exhaust detection unit is an exhaust temperature sensing bulb disposed at an exhaust port of the compressor.
7. The air make-up control method for a dual-stage compression air make-up air conditioning system according to claim 4, wherein the first valve body and the second valve body are both electronic expansion valves.
8. The air make-up control method for a two-stage compression air make-up air conditioning system according to claim 7, further comprising a four-way valve, wherein a first port of the four-way valve is connected to an outlet of the evaporator, a second port of the four-way valve is connected to an air inlet of the compressor, a third port of the four-way valve is connected to an air outlet of the compressor, and a fourth port of the four-way valve is connected to an inlet of the condenser.
9. The air make-up control method for a dual-stage compression air make-up air conditioning system according to claim 8, wherein the air conditioning system further comprises a refrigerant cooling device disposed between the condenser and the flash tank.
10. The air make-up control method for a dual-stage compression air make-up air conditioning system according to claim 9, wherein a third valve is disposed in a pipeline between the refrigerant cooling device and the condenser.
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