CN110608545A - Air conditioning system and control method thereof - Google Patents
Air conditioning system and control method thereof Download PDFInfo
- Publication number
- CN110608545A CN110608545A CN201910937926.6A CN201910937926A CN110608545A CN 110608545 A CN110608545 A CN 110608545A CN 201910937926 A CN201910937926 A CN 201910937926A CN 110608545 A CN110608545 A CN 110608545A
- Authority
- CN
- China
- Prior art keywords
- port
- heat exchanger
- communicated
- compressor
- electronic expansion
- 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
Classifications
-
- 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
- F24F11/62—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
-
- 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
- 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
-
- 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
- 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
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Signal Processing (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Thermal Sciences (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention provides an air conditioning system and a control method thereof, wherein the system comprises: the first port of the four-way reversing valve is communicated with the first port of the indoor heat exchanger, the second port of the four-way reversing valve is communicated with the first port of the outdoor heat exchanger, the third port of the four-way reversing valve is communicated with the exhaust port of the compressor, and the fourth port of the four-way reversing valve is communicated with the return air port of the compressor; the second port of the indoor heat exchanger is communicated with the inlet of the flash tank; the second port of the outdoor heat exchanger is communicated with the outlet of the flash tank; a gaseous refrigerant outlet of the flash tank is communicated with a gas return port of the compressor through a gas injection pipeline, and a throttling device is arranged on the gas injection pipeline; a first electronic expansion valve is arranged between the flash evaporator and the indoor heat exchanger, a second electronic expansion valve is arranged between the flash evaporator and the outdoor heat exchanger, and the indoor heat exchanger is communicated with the outdoor heat exchanger through the first electronic expansion valve, the flash evaporator and the second electronic expansion valve; the invention can reduce the evaporation resistance, reduce the resistance of the liquid refrigerant and reduce the dryness of the refrigerant, thereby improving the heat exchange efficiency of the evaporator.
Description
Technical Field
The invention relates to the technical field of enhanced vapor injection air conditioners, in particular to an air conditioning system and a control method thereof.
Background
When the air conditioning system is in heating operation under the low temperature condition, because the outdoor environment temperature is low, the temperature difference between the evaporating temperature of the outdoor heat exchanger and the environment temperature is very small, so that the quantity of heat absorbed from the external environment is relatively small, a large quantity of refrigerants are accumulated in the outdoor heat exchanger and the gas-liquid separator, the air suction and exhaust quantity of the compressor is insufficient, and the heating quantity of the indoor unit is greatly reduced. At present, partial manufacturers adopt a system with enhanced vapor injection to improve the heating capacity, generally use a flash evaporator to obtain a medium-pressure gaseous refrigerant which is used as the injection gas of an outdoor unit main compressor, but the vapor injection enhanced vapor injection scheme of the flash evaporator is easy to cause incomplete gas-liquid separation, and the refrigerant entering an air conditioner evaporator is generally gas-liquid two-phase, the specific volume of the gaseous refrigerant is large, and the resistance of the evaporator is large, so that the heat exchange capacity is low, and the heat exchange efficiency is influenced.
Disclosure of Invention
The invention provides an air conditioning system and a control method thereof, which can effectively improve the gas-liquid separation effect, so that gaseous refrigerants are separated and directly returned to a compressor, the heat exchange efficiency of evaporation measurement is improved, and the heat exchange efficiency is improved.
In order to solve the above technical problem, an embodiment of the present invention provides an air conditioning system, including: the system comprises an indoor heat exchanger, an outdoor heat exchanger, a compressor, a four-way reversing valve, a flash tank and a throttling device;
the four-way reversing valve is provided with a first port, a second port, a third port and a fourth port;
a first port of the indoor heat exchanger is communicated with a first port of the four-way reversing valve, and a second port of the indoor heat exchanger is communicated with an inlet of the flash tank;
a first port of the outdoor heat exchanger is communicated with a second port of the four-way reversing valve, and a second port of the outdoor heat exchanger is communicated with an outlet of the flash tank;
the exhaust port of the compressor is communicated with the third port of the four-way reversing valve, and the return port of the compressor is communicated with the fourth port of the four-way reversing valve;
a gaseous refrigerant outlet of the flash evaporator is communicated with a gas return port of the compressor through a gas injection pipeline, and a throttling device is arranged on the gas injection pipeline; a first electronic expansion valve is arranged on a connecting pipeline between an inlet of the flash evaporator and the second port of the indoor heat exchanger, a second electronic expansion valve is arranged on a connecting pipeline between an outlet of the flash evaporator and the second port of the outdoor heat exchanger, and the indoor heat exchanger is communicated with the outdoor heat exchanger through the first electronic expansion valve, the flash evaporator and the second electronic expansion valve.
Compared with the prior art, the embodiment of the invention has the beneficial effects that:
through set up throttling arrangement on the jet-propelled pipeline between flash tank and compressor, gaseous state refrigerant exit linkage throttling arrangement at flash tank promptly, through this throttling arrangement, the refrigerant that will get into the jet-propelled pipeline carries out the throttle step-down, it directly gets back to the compressor to step down through throttling arrangement after the separation of gaseous state refrigerant, reduce the evaporation and survey the resistance, liquid refrigerant after gas-liquid separation is through the evaporimeter evaporation heat absorption simultaneously, liquid refrigerant resistance reduces, improve the refrigerant quality of jet-propelled pipeline entry, the heat exchange efficiency of evaporimeter has effectively been promoted, promote the gas-liquid separation effect through flash tank and throttling arrangement simultaneously, avoid liquid refrigerant directly to get back to the compressor, lead to the compressor to produce the trouble because of the liquid that returns, thereby effectively reduce the compressor trouble, the risk of wearing and tearing.
Preferably, the flash tank comprises a cavity, an inlet pipe, an outlet pipe and a gaseous refrigerant outlet pipe, wherein the inlet pipe, the outlet pipe and the gaseous refrigerant outlet pipe are inserted into the cavity; the inlet pipe is provided with a first liquid spraying hole and a first oil return hole, and is communicated with the inlet of the flash tank and the cavity through the first liquid spraying hole and the first oil return hole; the outlet pipe is provided with a second liquid spraying hole and a second oil return hole, is communicated with the outlet of the flash tank and is communicated with the cavity through the second liquid spraying hole and the second oil return hole; the side face of the tail end of the gaseous refrigerant outlet pipe is provided with a plurality of round holes, and the gaseous refrigerant outlet pipe is communicated with the gaseous refrigerant outlet and is communicated with the cavity through the round holes.
Compared with the prior art, the embodiment of the invention has the beneficial effects that:
in the refrigerant loop, the refrigerant mainly enters the inlet pipe through an inlet of the flash evaporator, then enters the cavity through the first liquid spraying hole and the first oil return hole for evaporation, namely gas-liquid separation treatment, then enters the gaseous refrigerant outlet pipe through the plurality of round holes at the tail end of the gaseous refrigerant outlet pipe after the gas-liquid separation, and finally enters the throttling device for throttling and pressure reduction, so that the gaseous refrigerant returns to the compressor for reuse.
Preferably, the throttling device is a throttle valve.
Preferably, a first stop valve is arranged on a connecting pipeline between the first port of the indoor heat exchanger and the first port of the four-way reversing valve, and a second stop valve is arranged on a connecting pipeline between the second port of the indoor heat exchanger and the first expansion valve.
As a preferable scheme, the air conditioner further comprises a controller and a controller, wherein the controller is respectively electrically connected with the compressor, the four-way reversing valve, the indoor heat exchanger, the outdoor heat exchanger, the throttling device, the first stop valve, the second stop valve, the first electronic expansion valve and the second electronic expansion valve.
Preferably, a connecting line of circle centers of the plurality of circular holes is parallel to a plane where the gaseous refrigerant outlet of the flash tank is located.
In order to solve the technical problem, an embodiment of the present invention provides a control method for an air conditioning system, where the air conditioning system is applied, where the control method includes:
when the air conditioner is in hot operation, the compressor is started;
detecting the temperatures of a return air port of the compressor and a heat exchange coil of the outdoor heat exchanger;
calculating a difference value between the temperature of the air return port of the compressor and the temperature of a heat exchange coil of the outdoor heat exchanger to serve as a first temperature difference value;
controlling the first electronic expansion valve to be fully opened so as to adjust the flow of the refrigerant entering the flash tank;
and adjusting the opening degree of the second electronic expansion valve according to the first temperature difference value and a preset first target temperature difference value so as to adjust the flow and the evaporation pressure of the refrigerant passing through the flash evaporator.
Compared with the prior art, the embodiment of the invention has the beneficial effects that:
when the air conditioner is in hot operation, controlling the first electronic expansion valve to be fully opened so as to adjust the flow of the refrigerant entering the flash tank; and adjusting the opening degree of the second electronic expansion valve according to the first temperature difference value and a preset first target temperature difference so as to adjust the flow and the evaporation pressure of the refrigerant passing through the flash evaporator, effectively improving the gas-liquid separation efficiency of the air conditioner during heating operation and reducing the liquid return risk of the air injection pipeline.
Preferably, the control method further includes:
when the air conditioner operates in a refrigerating mode, the compressor is started;
detecting the temperatures of a return air port of the compressor and a heat exchange coil of the indoor heat exchanger;
calculating a difference value between the temperature of the air return port of the compressor and the temperature of a heat exchange coil of the indoor heat exchanger to serve as a second temperature difference value;
controlling the second electronic expansion valve to be fully opened so as to adjust the flow of the refrigerant entering the flash tank;
and adjusting the opening degree of the first electronic expansion valve according to the second temperature difference value and a preset second target temperature difference value to adjust the pressure of the refrigerant in the flash evaporator, so as to control the flow of the refrigerant at the air outlet of the flash evaporator.
Compared with the prior art, the embodiment of the invention has the beneficial effects that:
when the air conditioner operates in a refrigerating mode, the second electronic expansion valve is controlled to be fully opened so as to adjust the flow of the refrigerant entering the flash tank; and adjusting the opening degree of the first electronic expansion valve according to the second temperature difference value and a preset second target temperature difference to adjust the pressure of the refrigerant in the flash evaporator, so as to control the flow of the refrigerant at the air nozzle of the flash evaporator, effectively improve the gas-liquid separation efficiency of the air conditioner during the refrigeration operation, and reduce the liquid return risk of the air injection pipeline.
Preferably, the control method further includes:
when the air conditioner is in a hot operation,
an opening degree of the first electronic expansion valve is 2 × (the first temperature difference value — a first target temperature difference);
when the air conditioner is operated in a cooling mode,
the opening degree of the second electronic expansion valve is 2 × (the second temperature difference value — a second target temperature difference).
Drawings
Fig. 1 is a schematic structural view of an air conditioning system according to a first embodiment of the present invention;
FIG. 2 is a schematic view of a portion of a flash tank according to a first embodiment of the present invention;
FIG. 3 is another schematic view of a portion of the flash tank of the first embodiment of the present invention;
fig. 4 is a flowchart of a control method of an air conditioning system according to a second embodiment of the present invention;
wherein the reference numbers in the drawings of the specification are as follows:
1. a compressor; 2. a four-way reversing valve; 3. an indoor heat exchanger; 4. an outdoor heat exchanger; 5. a flash tank, 6 and a throttling device; 7. a first shut-off valve; 8. a second stop valve; 9. a first electronic expansion valve; 10. a second electronic expansion valve; 52. an inlet pipe; 52. an outlet pipe; 53. a gaseous refrigerant outlet pipe; 511. a first liquid ejection hole; 512. a first oil return hole; 521. a second liquid ejection hole; 522. the second oil return hole; 531. a circular hole.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first embodiment:
referring to fig. 1, a first embodiment of the present invention provides an air conditioning system, including: the system comprises an indoor heat exchanger 3, an outdoor heat exchanger 4, a compressor 1, a four-way reversing valve 2, a flash tank 5 and a throttling device 6;
the four-way reversing valve 2 is provided with a first port, a second port, a third port and a fourth port;
a first port of the indoor heat exchanger 3 is communicated with a first port of the four-way reversing valve 2, and a second port of the indoor heat exchanger 3 is communicated with an inlet of the flash tank 5;
a first port of the outdoor heat exchanger 4 is communicated with a second port of the four-way reversing valve 2, and a second port of the outdoor heat exchanger 4 is communicated with an outlet of the flash tank 5;
the exhaust port of the compressor 1 is communicated with the third port of the four-way reversing valve 2, and the return port of the compressor 1 is communicated with the fourth port of the four-way reversing valve 2;
a gaseous refrigerant outlet of the flash evaporator 5 is communicated with a return air port of the compressor 1 through an air injection pipeline, and a throttling device 6 is arranged on the air injection pipeline; a first electronic expansion valve 9 is arranged on a connecting pipeline between an inlet of the flash evaporator 5 and a second port of the indoor heat exchanger 3, a second electronic expansion valve 10 is arranged on a connecting pipeline between an outlet of the flash evaporator 5 and a second port of the outdoor heat exchanger 4, and the indoor heat exchanger 3 is communicated with the outdoor heat exchanger 4 through the first electronic expansion valve 9, the flash evaporator 5 and the second electronic expansion valve 10. .
Of course, in order to design the system structure more reasonably, a first stop valve 7 is arranged on a connecting pipeline between the first port of the indoor heat exchanger 3 and the first port of the four-way reversing valve 2, and a second stop valve 8 is arranged on a connecting pipeline between the second port of the indoor heat exchanger 3 and the first expansion valve 9. It can be understood that the first port of the outdoor heat exchanger 4 is communicated with the second port of the four-way reversing valve 2 through a connecting pipeline, and the second port of the outdoor heat exchanger 4 is communicated with the outlet of the flash tank 5 through a connecting pipeline; the exhaust port of the compressor 1 is communicated with the third port of the four-way reversing valve 2 through an exhaust pipeline, and the gas return port of the compressor 1 is communicated with the fourth port of the four-way reversing valve 2 through a gas return pipeline. And temperature sensors are respectively arranged on an exhaust pipeline between the exhaust port of the compressor 1 and the third port of the four-way reversing valve 2 and an air return pipeline between the air return port of the compressor 1 and the fourth port of the four-way reversing valve 2 and used for detecting the temperatures of the exhaust port and the air return port.
In the practice of the invention, the throttling means 6 is a throttle valve. In the embodiment of the invention, during heating operation: the first electronic expansion valve is fully opened, the second electronic expansion valve performs throttling regulation, and the second electronic expansion valve is used as a throttling device to perform throttling control; the gas-liquid two-phase refrigerant throttled by the first electronic expansion valve enters the flash tank for gas-liquid separation, and the liquid refrigerant absorbs heat by the evaporator and then is mixed with the gas separated by the flash tank and enters the compressor. During heating operation: the second electronic expansion valve is fully opened, the first electronic expansion valve performs throttling regulation, and the first electronic expansion valve is used as a throttling device to perform throttling control; the gas-liquid two-phase refrigerant throttled by the first electronic expansion valve enters the flash tank for gas-liquid separation, and the liquid refrigerant absorbs heat by the evaporator and then is mixed with the gas separated by the flash tank and enters the compressor. The throttling device enables the separated gas resistance to be equivalent to the resistance of the liquid refrigerant subjected to heat exchange by the evaporator, so that the situation that all the refrigerants return to the compressor through the throttling pressure equalizing device is avoided, and normal evaporation and refrigerant circulation measurement is guaranteed.
Through set up throttling arrangement 6 on the jet-propelled pipeline between flash tank 5 and compressor 1, gaseous state refrigerant exit linkage throttling arrangement 6 at flash tank 5 promptly, through this throttling arrangement 6, the refrigerant that will get into the jet-propelled pipeline carries out the throttle step-down, further promote the superheat degree of refrigerant, improve the refrigerant quality of jet-propelled pipeline entry, promote the gas-liquid separation effect, avoid liquid refrigerant directly to return to compressor 1, lead to compressor 1 to produce the trouble because of the liquid that returns, thereby effectively reduce compressor 1 trouble, the risk of wearing and tearing.
In an alternative embodiment, the flash tank 5 comprises a chamber, and an inlet pipe 52, an outlet pipe 52 and a gaseous refrigerant outlet pipe 53 inserted into the chamber; wherein the inlet pipe 51 is provided with a first liquid spraying hole 511 and a first oil return hole 512, the inlet pipe 51 is communicated with the inlet of the flash tank 5, and is communicated with the cavity through the first liquid spraying hole 511 and the first oil return hole 512; the outlet pipe 52 is provided with a second liquid spraying hole 521 and a second oil return hole 522, the outlet pipe 52 is communicated with the outlet of the flash tank 5, and is communicated with the cavity through the second liquid spraying hole 521 and the second oil return hole 522; the side surface of the tail end of the gaseous refrigerant outlet pipe 53 is provided with a plurality of round holes 531, and the gaseous refrigerant outlet pipe 53 is communicated with the gaseous refrigerant outlet and is communicated with the cavity through the round holes 531.
Preferably, a line connecting centers of the circular holes is parallel to a plane where the gaseous refrigerant outlet of the flash tank 5 is located.
In the embodiment of the invention, the tail ends of the gaseous refrigerant outlet pipe, the inlet pipe and the outlet pipe are all designed to be sealed. For example, 4 circular holes with the diameter of 2mm are uniformly formed in the side face of the tail end of the gaseous refrigerant outlet pipe, and the opening of the gaseous refrigerant outlet pipe is flush with the top of the straight pipe section of the flash tank 5, so that the liquid refrigerant after gas-liquid separation in the flash tank 5 is prevented from directly entering an air injection pipeline along the inner wall of the flash tank 5, and air injection and liquid return of the compressor 1 are caused.
In the embodiment of the invention, in the refrigerant loop, the refrigerant mainly enters the inlet pipe through the inlet of the flash evaporator 5, then enters the cavity through the first liquid spraying hole and the first oil return hole for evaporation, namely, gas-liquid separation treatment, then the refrigerant after gas-liquid separation enters the gaseous refrigerant outlet pipe through the plurality of round holes at the tail end of the gaseous refrigerant outlet pipe, and finally enters the throttling device 6 for throttling and pressure reduction, so that the gaseous refrigerant returns to the compressor 1 for reuse.
In an optional embodiment, the system further comprises a controller, and the controller is electrically connected to the compressor 1, the four-way reversing valve 2, the indoor heat exchanger 3, the outdoor heat exchanger 4, the throttling device 6, the first stop valve 7, the second stop valve 8, the first electronic expansion valve 9, and the second electronic expansion valve 10, respectively.
The working principle of the embodiment is described as follows:
when the air conditioner operates in a normal heating mode, a main refrigerant pipeline between the four-way reversing valve 2 and the indoor heat exchanger 3 is conducted;
the refrigerant output from the exhaust port of the compressor 1 sequentially flows into the flash tank 5 along the four-way reversing valve 2, the first stop valve 8, the indoor heat exchanger 3, the second stop valve 9 and the electronic throttle valve 10 to be subjected to gas-liquid separation, wherein the liquid refrigerant flows into the outdoor heat exchanger 4 along the electronic expansion valve 11 to be subjected to evaporation treatment, and the generated gaseous refrigerant flows back to the compressor 1 through the four-way reversing valve 2; the gaseous refrigerant flows back to the compressor 1 along the flash tank 5, the throttling device 6 and the electromagnetic valve 7.
When the air conditioner operates in a normal refrigeration mode, a connecting pipeline between the four-way reversing valve 2 and the outdoor heat exchanger 4 is conducted;
the refrigerant output from the exhaust port of the compressor 1 sequentially flows into the flash tank 5 along the four-way reversing valve 2, the outdoor heat exchanger 4 and the electronic expansion valve 11 to be subjected to gas-liquid separation, wherein the liquid refrigerant enters the indoor heat exchanger 3 along the electronic throttle valve 10 and the second stop valve 9 to be subjected to evaporation treatment, and then the generated gaseous refrigerant flows back to the compressor 1 through the first stop valve 8 and the four-way reversing valve 2; the gaseous refrigerant flows back to the compressor 1 along the flash tank 5, the throttling device 6 and the electromagnetic valve 7.
In summary, the air conditioning system provided in the embodiment of the present invention has the following beneficial effects:
1. in the whole heating or refrigerating process, the throttled refrigerant is separated into liquid refrigerant and gaseous refrigerant through the flash tank 5; the refrigerant entering the evaporator is all saturated liquid, and the liquid refrigerant is mixed with the separated gaseous refrigerant after absorbing heat by the evaporator and enters the compressor, so that the evaporation heat exchange area can be greatly reduced, the heat exchange efficiency is improved, and the cost of the whole machine is low; meanwhile, part of the refrigerant is subjected to gas-liquid separation through the flash evaporator 5 and throttling depressurization through the throttling device 6, the superheat degree of the refrigerant is improved, the dryness of the refrigerant at the inlet of the gas injection pipeline is improved, the gas-liquid separation effect is improved, the liquid refrigerant is prevented from directly returning to the compressor 1, the compressor 1 is prevented from generating faults due to liquid return, and therefore the risks of faults and abrasion of the compressor 1 are effectively reduced.
2. The gaseous state refrigerant outlet pipe of flash tank 5, the end of import pipe and outlet pipe all adopts and seals the design, and wherein, the terminal side of gaseous state refrigerant outlet pipe evenly sets up the round hole, and the top parallel and level of gaseous state refrigerant outlet pipe trompil department and 5 straight tube sections of flash tank promote the gas-liquid separation effect to prevent that the liquid refrigerant after the gas-liquid separation in the flash tank 5 from delaying 5 inner walls of flash tank and directly getting into the gas injection pipeline, cause the jet-propelled liquid return of compressor 1.
Second embodiment:
referring to fig. 4, a second embodiment of the present invention provides a control method of an air conditioning system, which is applied to the air conditioning system according to any one of the first embodiments, and the control method includes:
s11: when the air conditioner is in hot operation, the compressor is started;
s12: detecting the temperatures of a return air port of the compressor and a heat exchange coil of the outdoor heat exchanger;
s13: calculating a difference value between the temperature of the air return port of the compressor and the temperature of a heat exchange coil of the outdoor heat exchanger to serve as a first temperature difference value;
s14: controlling the first electronic expansion valve to be fully opened so as to adjust the flow of the refrigerant entering the flash tank;
s15: and adjusting the opening degree of the second electronic expansion valve according to the first temperature difference value and a preset first target temperature difference value so as to adjust the flow and the evaporation pressure of the refrigerant passing through the flash evaporator.
In the embodiment of the invention, when air conditioning hot operation is carried out, the opening of the electronic throttle valve is adjusted according to the difference value between the temperature of the exhaust port of the compressor and the temperature of the heat exchange coil of the indoor heat exchanger so as to adjust the pressure of the refrigerant in the flash evaporator, thereby controlling the flow of the refrigerant at the air injection port of the flash evaporator; according to the difference value between the temperature of the air return port of the compressor and the temperature of the heat exchange coil of the outdoor heat exchanger, the opening degree of the electronic expansion valve is adjusted to adjust the flow and the evaporation pressure of the refrigerant passing through the flash evaporator, so that the gas-liquid separation efficiency of the air conditioner during heating operation can be effectively improved, and the liquid return risk of the air injection pipeline is reduced.
In an optional implementation, the control method further comprises:
when the air conditioner operates in a refrigerating mode, the compressor is started;
detecting the temperatures of a return air port of the compressor and a heat exchange coil of the indoor heat exchanger;
calculating a difference value between the temperature of the air return port of the compressor and the temperature of a heat exchange coil of the indoor heat exchanger to serve as a second temperature difference value;
controlling the second electronic expansion valve to be fully opened so as to adjust the flow of the refrigerant entering the flash tank;
and adjusting the opening degree of the first electronic expansion valve according to the second temperature difference value and a preset second target temperature difference value to adjust the pressure of the refrigerant in the flash evaporator, so as to control the flow of the refrigerant at the air outlet of the flash evaporator.
In the implementation of the invention, when the air conditioner operates in a refrigerating mode, the opening degree of the electronic expansion valve is adjusted according to the difference value between the temperature of the exhaust port of the compressor and the temperature of the heat exchange coil of the outdoor heat exchanger so as to adjust the pressure of the refrigerant in the flash evaporator, and thus the flow of the refrigerant at the air injection port of the flash evaporator is controlled; according to the difference value between the temperature of the air return port of the compressor and the temperature of the heat exchange coil of the indoor heat exchanger, the opening degree of the electronic throttle valve is adjusted to adjust the flow and the evaporation pressure of the refrigerant passing through the flash evaporator, so that the gas-liquid separation efficiency of the air conditioner during the refrigeration operation can be effectively improved, and the liquid return risk of the air injection pipeline is reduced.
In an optional implementation, the control method further comprises:
when the air conditioner is in a hot operation,
an opening degree of the first electronic expansion valve is 2 × (the first temperature difference value — a first target temperature difference);
when the air conditioner is operated in a cooling mode,
the opening degree of the second electronic expansion valve is 2 × (the second temperature difference value — a second target temperature difference).
For the sake of an easy understanding, the following parameter definitions are made with respect to the respective temperature difference values:
first temperature difference value SSHHeating apparatus＝TAir suction-TOuter plateWherein, TAir suctionIndicating the temperature of the refrigerant at the return port of the compressor; t isOuter plateIndicating the temperature of the heat exchange coil of the outdoor heat exchanger;
second temperature difference value SSHRefrigeration system＝TAir suction-TInner disc(ii) a Wherein, TInner discIndicating the temperature of a heat exchange coil of the indoor heat exchanger;
in an embodiment of the present invention, a first target temperature difference DSH is setTargetSetting the second target temperature difference equal to SSHEyes of a userAnd (4) marking.
Then Δ SSHRefrigeration system＝SSHTarget-SSHRefrigeration (practice)，ΔDSHHeating apparatus＝DSHTarget-DSHHeating (actual)。
In the embodiment of the invention, during heating operation: the first electronic expansion valve is fully opened, the second electronic expansion valve performs throttling regulation, and the second electronic expansion valve is used as a throttling device to perform throttling control; the gas-liquid two-phase refrigerant throttled by the first electronic expansion valve enters the flash tank for gas-liquid separation, and the liquid refrigerant absorbs heat by the evaporator and then is mixed with the gas separated by the flash tank and enters the compressor. During heating operation: the second electronic expansion valve is fully opened, the first electronic expansion valve performs throttling regulation, and the first electronic expansion valve is used as a throttling device to perform throttling control; the gas-liquid two-phase refrigerant throttled by the first electronic expansion valve enters the flash tank for gas-liquid separation, and the liquid refrigerant absorbs heat by the evaporator and then is mixed with the gas separated by the flash tank and enters the compressor. The throttling device enables the separated gas resistance to be equivalent to the resistance of the liquid refrigerant subjected to heat exchange by the evaporator, so that the situation that all the refrigerants return to the compressor through the throttling pressure equalizing device is avoided, and normal evaporation and refrigerant circulation measurement is guaranteed.
In the refrigerating/heating process, respectively refrigerating according to the delta SSH and heating according to the delta DSH obtained by calculation, and adjusting the opening degree of the second electronic expansion valve or the first electronic expansion valve to adjust the pressure of the refrigerant in the flash evaporator, the flow rate of the refrigerant passing through the flash evaporator and the evaporation pressure, so that the refrigerant flow rate of the air nozzle of the flash evaporator is controlled, the air injection throttling is realized, the superheat degree of the air injection refrigerant is increased, and the reliability of the air injection compression is further improved.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (9)
1. An air conditioning system, comprising: the system comprises an indoor heat exchanger, an outdoor heat exchanger, a compressor, a four-way reversing valve, a flash tank and a throttling device;
the four-way reversing valve is provided with a first port, a second port, a third port and a fourth port;
a first port of the indoor heat exchanger is communicated with a first port of the four-way reversing valve, and a second port of the indoor heat exchanger is communicated with an inlet of the flash tank;
a first port of the outdoor heat exchanger is communicated with a second port of the four-way reversing valve, and a second port of the outdoor heat exchanger is communicated with an outlet of the flash tank;
the exhaust port of the compressor is communicated with the third port of the four-way reversing valve, and the return port of the compressor is communicated with the fourth port of the four-way reversing valve;
a gaseous refrigerant outlet of the flash evaporator is communicated with a gas return port of the compressor through a gas injection pipeline, and a throttling device is arranged on the gas injection pipeline; a first electronic expansion valve is arranged on a connecting pipeline between an inlet of the flash evaporator and the second port of the indoor heat exchanger, a second electronic expansion valve is arranged on a connecting pipeline between an outlet of the flash evaporator and the second port of the outdoor heat exchanger, and the indoor heat exchanger is communicated with the outdoor heat exchanger through the first electronic expansion valve, the flash evaporator and the second electronic expansion valve.
2. The air conditioning system as claimed in claim 1, wherein said flash tank comprises a chamber, and an inlet pipe, an outlet pipe and a gaseous refrigerant outlet pipe inserted into the chamber; the inlet pipe is provided with a first liquid spraying hole and a first oil return hole, and is communicated with the inlet of the flash tank and the cavity through the first liquid spraying hole and the first oil return hole; the outlet pipe is provided with a second liquid spraying hole and a second oil return hole, is communicated with the outlet of the flash tank and is communicated with the cavity through the second liquid spraying hole and the second oil return hole; the side face of the tail end of the gaseous refrigerant outlet pipe is provided with a plurality of round holes, and the gaseous refrigerant outlet pipe is communicated with the gaseous refrigerant outlet and is communicated with the cavity through the round holes.
3. The air conditioning system as claimed in claim 1, wherein said throttling means is a throttle valve.
4. The air conditioning system as claimed in claim 3, wherein a first stop valve is provided on a connection pipe between the first port of the indoor heat exchanger and the first port of the four-way selector valve, and a second stop valve is provided on a connection pipe between the second port of the indoor heat exchanger and the first expansion valve.
5. The air conditioning system of claim 4, further comprising a controller electrically connected to the compressor, the four-way reversing valve, the indoor heat exchanger, the outdoor heat exchanger, the throttling device, the first shut-off valve, the second shut-off valve, the first electronic expansion valve, and the second electronic expansion valve, respectively.
6. The air conditioning system as claimed in claim 2, wherein a line connecting centers of the circular holes is parallel to a plane where the gaseous refrigerant outlet of the flash tank is located.
7. A control method of an air conditioning system, characterized by applying the air conditioning system according to any one of claims 1 to 6, the control method comprising:
when the air conditioner is in hot operation, the compressor is started;
detecting the temperatures of a return air port of the compressor and a heat exchange coil of the outdoor heat exchanger;
calculating a difference value between the temperature of the air return port of the compressor and the temperature of a heat exchange coil of the outdoor heat exchanger to serve as a first temperature difference value;
controlling the first electronic expansion valve to be fully opened so as to adjust the flow of the refrigerant entering the flash tank;
and adjusting the opening degree of the second electronic expansion valve according to the first temperature difference value and a preset first target temperature difference value so as to adjust the flow and the evaporation pressure of the refrigerant passing through the flash evaporator.
8. The control method of an air conditioning system as set forth in claim 7, further comprising:
when the air conditioner operates in a refrigerating mode, the compressor is started;
detecting the temperatures of a return air port of the compressor and a heat exchange coil of the indoor heat exchanger;
calculating a difference value between the temperature of the air return port of the compressor and the temperature of a heat exchange coil of the indoor heat exchanger to serve as a second temperature difference value;
controlling the second electronic expansion valve to be fully opened so as to adjust the flow of the refrigerant entering the flash tank;
and adjusting the opening degree of the first electronic expansion valve according to the second temperature difference value and a preset second target temperature difference value to adjust the pressure of the refrigerant in the flash evaporator, so as to control the flow of the refrigerant at the air outlet of the flash evaporator.
9. The control method of an air conditioning system as set forth in claim 8, further comprising:
when the air conditioner is in a hot operation,
an opening degree of the first electronic expansion valve is 2 × (the first temperature difference value — a first target temperature difference);
when the air conditioner is operated in a cooling mode,
the opening degree of the second electronic expansion valve is 2 × (the second temperature difference value — a second target temperature difference).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910937926.6A CN110608545A (en) | 2019-09-29 | 2019-09-29 | Air conditioning system and control method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910937926.6A CN110608545A (en) | 2019-09-29 | 2019-09-29 | Air conditioning system and control method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110608545A true CN110608545A (en) | 2019-12-24 |
Family
ID=68894121
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910937926.6A Pending CN110608545A (en) | 2019-09-29 | 2019-09-29 | Air conditioning system and control method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110608545A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113970126A (en) * | 2020-07-07 | 2022-01-25 | 广东美的制冷设备有限公司 | Air conditioner, control method of air conditioner and storage medium |
| CN114353393A (en) * | 2020-09-29 | 2022-04-15 | 广东美的制冷设备有限公司 | Air conditioner, control method, control device and computer readable storage medium |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20090132938A (en) * | 2008-06-23 | 2009-12-31 | 엘지전자 주식회사 | Oil cooling device and air-conditioning apparatus comprising the same |
| CN103629873A (en) * | 2012-08-23 | 2014-03-12 | 珠海格力节能环保制冷技术研究中心有限公司 | Control method of two-stage compression air conditioning system |
| CN105333599A (en) * | 2014-07-08 | 2016-02-17 | 海信（山东）空调有限公司 | Air replenishing and enthalpy increasing air conditioning system |
| CN107178937A (en) * | 2017-06-30 | 2017-09-19 | 美的集团武汉制冷设备有限公司 | Flash vessel and air-conditioning system |
| CN108759211A (en) * | 2018-06-12 | 2018-11-06 | 重庆美的通用制冷设备有限公司 | The second vapor injection control method of two stage centrifugal unit and two stage centrifugal unit |
-
2019
- 2019-09-29 CN CN201910937926.6A patent/CN110608545A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20090132938A (en) * | 2008-06-23 | 2009-12-31 | 엘지전자 주식회사 | Oil cooling device and air-conditioning apparatus comprising the same |
| CN103629873A (en) * | 2012-08-23 | 2014-03-12 | 珠海格力节能环保制冷技术研究中心有限公司 | Control method of two-stage compression air conditioning system |
| CN105333599A (en) * | 2014-07-08 | 2016-02-17 | 海信（山东）空调有限公司 | Air replenishing and enthalpy increasing air conditioning system |
| CN107178937A (en) * | 2017-06-30 | 2017-09-19 | 美的集团武汉制冷设备有限公司 | Flash vessel and air-conditioning system |
| CN108759211A (en) * | 2018-06-12 | 2018-11-06 | 重庆美的通用制冷设备有限公司 | The second vapor injection control method of two stage centrifugal unit and two stage centrifugal unit |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113970126A (en) * | 2020-07-07 | 2022-01-25 | 广东美的制冷设备有限公司 | Air conditioner, control method of air conditioner and storage medium |
| CN113970126B (en) * | 2020-07-07 | 2022-11-11 | 广东美的制冷设备有限公司 | Air conditioner, control method of air conditioner and storage medium |
| CN114353393A (en) * | 2020-09-29 | 2022-04-15 | 广东美的制冷设备有限公司 | Air conditioner, control method, control device and computer readable storage medium |
| CN114353393B (en) * | 2020-09-29 | 2024-05-28 | 广东美的制冷设备有限公司 | Air conditioner, control method, control device and computer readable storage medium |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104729033B (en) | The antifreeze method and apparatus of the handpiece Water Chilling Units of air-conditioner set | |
| CN110595092A (en) | Enhanced vapor injection air conditioning system and control method thereof | |
| US8424333B2 (en) | Air conditioner | |
| CN103542606B (en) | Heat pump type air conditioning system and control method thereof | |
| WO2016188295A1 (en) | Outdoor unit for heat recovery multi-split air conditioning system and heat recovery multi-split air conditioning system | |
| CN105091258A (en) | Air conditioner and cooling control method thereof | |
| CN103398520B (en) | The liquid-level detecting method of air-conditioning system and gas-liquid separator thereof | |
| CN108343600B (en) | Performance test board for compressor and use method | |
| CN104048366A (en) | Air conditioner, outdoor unit of air conditioner, heating air supplementing method and refrigeration air supplementing method | |
| CN107917523B (en) | Outdoor heat exchanger for heat pump and control method thereof | |
| CN109140725B (en) | Multi-split air conditioning system and defrosting control method thereof | |
| CN107655164B (en) | Method for controlling opening degree of electronic expansion valve of indoor unit of air conditioner of water system | |
| CN105571221A (en) | Air conditioner system and control method of air conditioner system | |
| CN107965853B (en) | Outdoor unit of three-pipe multi-split air conditioner system and control method | |
| CN110608545A (en) | Air conditioning system and control method thereof | |
| CN206861943U (en) | Hot gas bypass defrosting structure, air-conditioner outdoor unit and air conditioner | |
| CN100535550C (en) | Automobile heat pump air conditioner system | |
| CN111271893A (en) | Air-conditioning heat pump hot water system and control method thereof | |
| CN204154039U (en) | Aircondition | |
| CN100398918C (en) | Engine-driven air conditioning machine | |
| CN100436970C (en) | Air conditioner and its control method for the pressure equilibrium | |
| CN214701327U (en) | Centrifugal cascade high-pressure ratio series unit | |
| KR101160351B1 (en) | Multi air conditioner and control method thereof | |
| CN110243111A (en) | Heat exchanger liquid separation control method, device, equipment and air conditioner | |
| CN219036903U (en) | Heat exchange and outdoor unit with wide capacity control |
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 | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20191224 |
|
| RJ01 | Rejection of invention patent application after publication |