WO2020220581A1 - 空调系统 - Google Patents
空调系统 Download PDFInfo
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- WO2020220581A1 WO2020220581A1 PCT/CN2019/109651 CN2019109651W WO2020220581A1 WO 2020220581 A1 WO2020220581 A1 WO 2020220581A1 CN 2019109651 W CN2019109651 W CN 2019109651W WO 2020220581 A1 WO2020220581 A1 WO 2020220581A1
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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
- F25B41/40—Fluid line arrangements
- F25B41/42—Arrangements for diverging or converging flows, e.g. branch lines or junctions
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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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B13/00—Compression machines, plants or systems, with reversible cycle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B31/00—Compressor arrangements
- F25B31/02—Compressor arrangements of motor-compressor units
- F25B31/023—Compressor arrangements of motor-compressor units with compressor of reciprocating-piston type
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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
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control 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
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/31—Expansion valves
- F25B41/33—Expansion valves with the valve member being actuated by the fluid pressure, e.g. by the pressure of the refrigerant
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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
- F25B41/36—Expansion valves with the valve member being actuated by bimetal elements or shape-memory elements influenced by fluids, e.g. by the refrigerant
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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
- F25B41/39—Dispositions with two or more expansion means arranged in series, i.e. multi-stage expansion, on a refrigerant line leading to the same evaporator
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- 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
- F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
- F25B2313/027—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means
- F25B2313/02731—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means using one three-way valve
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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
- F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
- F25B2313/027—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means
- F25B2313/02741—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means using one four-way valve
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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
- F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
- F25B2313/029—Control issues
- F25B2313/0293—Control issues related to the indoor fan, e.g. controlling speed
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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
- F25B2341/00—Details of ejectors not being used as compression device; Details of flow restrictors or expansion valves
- F25B2341/06—Details of flow restrictors or expansion valves
- F25B2341/068—Expansion valves combined with a sensor
- F25B2341/0683—Expansion valves combined with a sensor the sensor is disposed in the suction line and influenced by the temperature or the pressure of the suction gas
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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
- F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
- F25B2400/07—Details of compressors or related parts
- F25B2400/074—Details of compressors or related parts with multiple cylinders
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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
- F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
- F25B2400/19—Pumping down refrigerant from one part of the cycle to another part of the cycle, e.g. when the cycle is changed from cooling to heating, or before a defrost cycle is started
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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
- F25B2600/00—Control issues
- F25B2600/02—Compressor control
- F25B2600/025—Compressor control by controlling speed
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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
- F25B2600/00—Control issues
- F25B2600/02—Compressor control
- F25B2600/026—Compressor control by controlling unloaders
- F25B2600/0261—Compressor control by controlling unloaders external to the compressor
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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
- F25B2600/00—Control issues
- F25B2600/11—Fan speed control
- F25B2600/111—Fan speed control of condenser fans
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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
- F25B2600/00—Control issues
- F25B2600/11—Fan speed control
- F25B2600/112—Fan speed control of evaporator fans
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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
- F25B2600/00—Control issues
- F25B2600/25—Control of valves
- F25B2600/2507—Flow-diverting valves
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
Definitions
- This application relates to the field of refrigeration technology, and specifically to an air conditioning system.
- the compressor used in the fixed-speed air-conditioning system operates at a fixed speed.
- the compressor When the indoor thermal load is less than the cooling capacity of the compressor, the compressor must be started and stopped continuously, so as to maintain a roughly constant indoor temperature. , The frequent start and stop of the compressor reduces the refrigeration efficiency of the refrigeration system at part load, and the annual energy efficiency drops.
- variable capacity refrigeration compressor is a compressor with two or more compression chambers, and is typically a rotary compressor with two cylinders.
- the air-conditioning system using variable capacity compressors can avoid the frequent compressor start and stop and partial-load efficiency reduction problems that exist in the fixed-speed air-conditioning system at part load.
- variable capacity compressor is a compromise solution that takes into account the low cost of the fixed speed compressor and the high efficiency of the variable frequency compressor. It is an important direction in the development of compressor technology in recent years. Its design focuses on how to set up reasonable The variable volume program.
- another method is to use the residual cooling and residual heat in the indoor heat exchanger when the compressor is stopped.
- the compressor just shuts down and the refrigerant in the indoor and outdoor heat exchangers has not yet reached a complete pressure balance, the refrigerant in the indoor heat exchanger is still at a low temperature (in cooling mode) or When the temperature is high (in heating mode), if the indoor fan continues to run for a period of time, it can continue to supply cold or hot air to the room for a period of time with lower energy consumption, which is the residual cold or residual heat use.
- this is only an ideal situation.
- This application aims to solve at least one of the technical problems existing in the prior art or related technologies.
- an air conditioning system which includes a high-pressure pipe, a low-pressure pipe, an indoor heat exchanger, an outdoor heat exchanger, a leak-free thermal expansion valve, and a variable capacity compressor.
- the high-pressure pipe is used for supply High-pressure refrigerant circulates; low-pressure pipes are used to circulate low-pressure refrigerants, and the low-pressure pipes can be connected to the high-pressure pipes; the indoor heat exchanger is connected to one of the high-pressure pipe and the low-pressure pipe; the outdoor heat exchanger is connected with the high-pressure pipe and the low-pressure pipe The other one is connected; the non-leakage thermal expansion valve is connected between the indoor heat exchanger and the outdoor heat exchanger; the variable capacity compressor includes a shell, a first cylinder and a second cylinder, and the shell is provided with an air inlet and Exhaust port; the first cylinder is provided with a first suction hole connected with the suction port, a first exhaust hole connected with the exhaust port, and a pressure relief that can be connected to the high-pressure pipe and the low-pressure pipe at the same time Hole; the second cylinder is provided with a second suction hole connected with the suction port, and a second exhaust hole connected with the exhaust port; wherein,
- the air conditioning system provided by the embodiments of the present application, on the one hand, by arranging a leak-free thermal expansion valve between the indoor heat exchanger and the outdoor heat exchanger, the refrigerant on the high and low pressure sides of the air conditioning system can be blocked after the variable capacity compressor is stopped. Do not let the refrigerant mix to achieve pressure or temperature balance (the compressor cylinder itself has a good sealing effect when shutting down, so the refrigerant cannot achieve rapid balance through the compressor cylinder), so that the residual cooling or temperature in the indoor heat exchanger can be used Waste heat improves the annual energy efficiency of the air conditioning system.
- a non-leakage thermal expansion valve is a thermal expansion valve that normally throttles when the high and low pressure difference is large, and shuts off when the pressure difference between the two sides drops to a certain degree, so that it can be changed When the capacity compressor is stopped, it can effectively keep the high-temperature high-pressure refrigerant and the low-temperature low-pressure refrigerant in the condenser and evaporator respectively.
- the non-leakage thermal expansion valve completely cuts off the pipeline between the indoor heat exchanger and the outdoor heat exchanger when the variable capacity compressor is stopped, and the high and low pressures cannot be completely balanced, so the variable capacity compressor restarts At this time, it will bring a greater start-up shock to the variable-capacity compressor (especially the rotor compressor with small aerodynamic torque and sensitive to the starting pressure difference).
- the first preset duration is related to the mixing speed of the refrigerant, is affected by the pressure difference between the high and low pressure sides, and is also affected by the charge, viscosity and flow resistance of the refrigerant.
- the first preset duration is related to the mixing speed of the refrigerant, is affected by the pressure difference between the high and low pressure sides, and is also affected by the charge, viscosity and flow resistance of the refrigerant.
- variable capacity compressor by configuring a variable capacity compressor with a first cylinder and a second cylinder, the operating capacity can be adjusted according to the indoor cooling or heating load, thereby avoiding frequent start and stop of the compressor in the fixed-speed air-conditioning system at partial load
- SEER is much higher than that of a fixed-speed air-conditioning system.
- cost is much lower than that of an inverter air-conditioning system, taking into account both low cost and high efficiency.
- both the first vent hole and the second vent hole communicate with the inside of the housing, and further communicate with the exhaust port.
- the first cylinder adopts the sliding vane groove pressure change unloading method, and determines whether the cylinder is working by controlling the pressure of the sliding vane cavity.
- the pressure of the high-pressure refrigerant in the high-pressure pipe and the pressure of the discharge port of the variable capacity compressor Consistent, the pressure of the low-pressure refrigerant in the low-pressure pipe is the same as the pressure of the suction port of the variable capacity compressor.
- the pressure relief hole of the first cylinder can be connected to the high pressure pipe and the low pressure pipe at the same time.
- the first cylinder can work normally, that is, it can compress gas normally; when the pressure relief hole is connected to the low-pressure pipe, the first cylinder is unloaded due to the same inlet and exhaust pressures. At this time, the first cylinder is not working, that is, it cannot participate in the gas. compression.
- the second cylinder is an ordinary cylinder, which can always compress gas when the variable capacity compressor is running.
- the present application can isolate high-temperature refrigerant and low-temperature refrigerant when the variable-capacity compressor is stopped by installing a leak-free thermal expansion valve, so as to utilize the residual cold or heat in the indoor heat exchanger and increase the annual energy of the air conditioning system. effectiveness.
- the low-pressure pipe, the high-pressure pipe, and the pressure relief hole of the first cylinder of the variable-capacity compressor of the air-conditioning system can be connected on and off. There are three on-off states among the three, which can be switched at different timings.
- One is to connect the low-pressure pipe and the high-pressure pipe before starting the variable-capacity compressor to achieve rapid pressure balance on the high and low-pressure sides to ensure the safety of the variable-capacity compressor; Connect to unload the first cylinder, so that the variable-capacity compressor only runs at a partial capacity; third, when the variable-capacity compressor is started, connect the high-pressure pipe with the pressure relief hole to make the first cylinder work normally.
- the latter two on-off states respectively correspond to the two operating capacities of the variable capacity compressor. Switching between the two can realize the switching of the operating capacity of the variable capacity compressor, which helps to improve seasonal energy efficiency. It is understandable that when the variable capacity compressor is stopped and the non-leakage thermal expansion valve acts as a blocking function, the on-off state between the above three does not need to change, that is, it is not necessary to switch the operating capacity of the variable capacity compressor.
- the present application can effectively utilize the residual cooling or waste heat by configuring a non-leakage thermal expansion valve, and use a set of on-off structures in different working states at different timings, and at the same time realize the safe starting and operating capacity switching of the variable capacity compressor. While improving the annual energy efficiency of the air-conditioning system, it is convenient for practical applications and has a lower cost.
- the air conditioning system in the above technical solution provided by this application may also have the following additional technical features:
- the air conditioning system also includes: a three-way valve, the first port of the three-way valve is connected to the pressure relief hole, the second port of the three-way valve is connected to the high-pressure pipe, and the third port of the three-way valve is connected to the low pressure.
- the tube is connected.
- an on-off scheme between the high-pressure pipe, the low-pressure pipe and the pressure relief hole is specifically defined.
- the three-way valve By setting the three-way valve, the three ports of which are respectively connected to the pressure relief hole, the high pressure pipe and the low pressure pipe, different conduction states among the three can be realized, and different operating states of the air conditioning system can be switched.
- the three-way valve has three conduction states: in the first conduction state, the first port and the second port are conducted, and the third port is disconnected.
- the pressure relief hole is connected to the high-pressure pipe, and the first One cylinder can work normally, and the variable-capacity compressor runs at full capacity; in the second conduction state, the first port and the third port are connected, and the second port is disconnected.
- the pressure relief hole is connected to the low pressure pipe.
- One cylinder is unloaded, and the variable capacity compressor only runs at partial capacity; in the third conduction state, the second port and the third port are connected, and the first port is disconnected, which can achieve rapid pressure before the variable capacity compressor starts The balance ensures the safety of restarting the variable capacity compressor.
- This solution uses only a three-way valve to switch between full capacity operation mode and partial capacity operation mode of the variable capacity compressor, and maintains a high and low pressure difference when the variable capacity compressor is stopped to make full use of the indoor heat exchange of the air conditioning system
- Three functions such as the residual cooling or waste heat in the air conditioner, and the realization of high and low pressure balance before the variable capacity compressor starts to avoid the variable capacity compressor starting on load, have achieved the improvement of the annual energy efficiency of the air conditioning system while reducing the system cost. the goal of.
- the three-way valve can be in various forms, for example, an electromagnetic three-way valve can be used to facilitate automatic control.
- the air conditioning system also includes a first solenoid valve and a second solenoid valve.
- the first solenoid valve is connected between the pressure relief hole and the high pressure pipe
- the second solenoid valve is connected between the pressure relief hole and the low pressure pipe.
- the first solenoid valve and the second solenoid valve When the first solenoid valve and the second solenoid valve are opened at the same time, the high pressure The pipe and the low-pressure pipe are conducted through the pressure relief hole, which can achieve rapid pressure balance before the variable capacity compressor starts (equivalent to the third conduction state of the three-way valve).
- the action sequence of the first solenoid valve and the second solenoid valve By controlling the action sequence of the first solenoid valve and the second solenoid valve, the switching between the full capacity operation mode and the partial capacity operation mode of the variable capacity compressor is realized.
- the variable capacity compressor When the variable capacity compressor is stopped, the high and low pressure difference is maintained to fully.
- the structure is simple, easy to control, and low in cost.
- the air conditioning system also includes: a four-way valve, the first port of the four-way valve is connected to the exhaust port, the second port of the four-way valve is connected to the outdoor heat exchanger, and the third port of the four-way valve Connected with the suction port, and the fourth port of the four-way valve is connected with the indoor heat exchanger.
- the air conditioning system is also provided with a four-way valve, which has four ports, which are respectively connected to the exhaust port of the variable capacity compressor, the outdoor heat exchanger, the suction port of the variable capacity compressor, and the indoor heat exchange ⁇ Connected.
- the four-way valve has two communication states to switch between cooling mode and heating mode.
- the first connection state the first port and the second port are connected, that is, the exhaust port is connected to the outdoor heat exchanger, the outdoor heat exchanger is used as a condenser, and the third port and the fourth port are connected, that is, the suction port is connected to the indoor
- the heat exchanger is connected, the indoor heat exchanger is used as the evaporator, and the air conditioning system runs in the cooling mode
- the first interface and the fourth interface are connected, that is, the exhaust port is connected to the indoor heat exchanger, and the indoor heat exchanger
- the second interface and the third interface are connected, that is, the suction port is connected to the outdoor heat exchanger, the outdoor heat exchanger is used as an evaporator, and the air conditioning system runs in heating mode.
- the two ends of the high-pressure pipe are respectively connected to the first interface and the exhaust port, and the two ends of the low-pressure pipe are respectively connected to the third interface and the suction port.
- an arrangement scheme of high-pressure pipe and low-pressure pipe is specifically defined.
- the two are directly connected to the exhaust port and the suction port, and adjacent to the pressure relief hole, the pipeline can be shortened.
- the two ends of one of the high-pressure pipe and the low-pressure pipe are respectively connected to the indoor heat exchanger and the non-leakage thermal expansion valve, and the two ends of the other of the high-pressure pipe and the low-pressure pipe are respectively connected to the outdoor heat exchanger and Leak-free thermal expansion valve.
- the outdoor heat exchanger When the air conditioning system is running in the cooling mode, the outdoor heat exchanger is on the high-pressure side, and the indoor heat exchanger The heat exchanger is on the low-pressure side, the pipeline between the outdoor heat exchanger and the non-leakage thermal expansion valve is a high-pressure pipe, and the pipeline between the indoor heat exchanger and the non-leakage thermal expansion valve is a low-pressure pipe, and vice versa. I will not repeat them here.
- the non-leakage thermal expansion valve is a one-way throttling element, which only plays a role of throttling when the refrigerant flows from the outdoor heat exchanger to the indoor heat exchanger, and only plays a role of circulation when the refrigerant flows in the reverse direction ;
- the air conditioning system also includes: a one-way throttling device, the one-way throttling device is connected to a non-leakage thermal expansion valve, and only plays a throttling role when the refrigerant flows from the indoor heat exchanger to the outdoor heat exchanger, when the refrigerant is reversed It only plays a role of circulation when it flows.
- the non-leakage thermal expansion valve is specifically defined as a one-way throttling element, which only plays a throttling role when the refrigerant flows in the forward direction, and only plays a role of circulation when the refrigerant flows in the reverse direction.
- a one-way throttling device whose throttling direction is opposite to that of the non-leakage thermal expansion valve is also provided.
- the one-way throttling device is also a one-way throttling element. Through the cooperation of the two, It can ensure the smooth throttling of refrigerant in both cooling mode and heating mode.
- the non-leakage thermal expansion valve includes a valve body and the first valve port, the second valve port, the external balance pipe, and the temperature sensing bulb connected to the valve body.
- the first valve port is directly or indirectly connected to the outdoor heat exchanger. Connected; the second valve port is directly or indirectly connected to the indoor heat exchanger; the outer balance pipe is connected to the suction port; the temperature sensing bulb is arranged on the pipeline between the outer balance pipe and the suction port, and is close to the outer balance pipe and the suction port
- the connection point of the pipeline of the gas port wherein, when the pressure difference between the first valve port and the second valve port is greater than or equal to the conduction pressure difference, and the refrigerant flows from the first valve port to the second valve port, there is no leakage heat
- the expansion valve plays a throttling role; when the pressure difference between the first valve port and the second valve port is greater than or equal to the conduction pressure difference, and the refrigerant flows from the second valve port to the first valve port, the non-le
- the non-leakage thermal expansion valve is a one-way throttling element with pressure maintaining function, which can meet the requirements of the variable capacity compressor during operation. It is turned on to ensure the smooth throttling of the refrigerant, and it will be turned off when the pressure difference between the high and low pressure sides is reduced to avoid mixing of the high and low pressure side refrigerants, so that the residual cold or heat in the indoor heat exchanger can be used to improve the overall air conditioning system. Annual energy efficiency.
- the value range of the first preset duration is 3 seconds to 60 seconds.
- the value range of the first preset duration is specifically limited to be 3 seconds to 60 seconds.
- the lower limit value can ensure the effective balance of the pressure difference between the high and low pressure sides and ensure the smooth and safe start of the variable capacity compressor.
- the upper limit value can help control the time consumption of pressure adjustment and avoid the air-conditioning system from being turned on for a long time and affecting users Sense of experience.
- the air conditioning system also includes an indoor fan and a controller.
- the indoor fan is set toward the indoor heat exchanger; the controller is electrically connected to the indoor fan, and the controller controls the indoor fan to continue to run after the variable capacity compressor stops. The preset duration.
- the air-conditioning system also includes an indoor fan set toward the indoor heat exchanger, and a controller electrically connected to the indoor fan.
- the controller controls the indoor fan to continue to run for a second preset time after shutting down, and the indoor fan can continue to run indoors. Air supply, thus making full use of the residual cold or residual heat of the refrigerant remaining in the indoor heat exchanger after shutdown, which is beneficial to increase the energy efficiency of the air conditioning system.
- the value range of the second preset duration is 60 seconds to 90 seconds.
- the value range of the second preset time period is specifically limited to 60 seconds to 90 seconds.
- the lower limit value can ensure that the residual cold or residual heat of the refrigerant in the indoor heat exchanger is fully utilized, and the air conditioning system is increased Energy efficiency, the upper limit can avoid blowing hot or cold air into the room after the residual cold or residual heat is exhausted, which helps to improve the health and comfort of users.
- Figure 1 shows a schematic structural diagram of an air conditioning system in a cooling mode according to a specific embodiment of the present application
- Figure 2 shows a schematic structural diagram of an air conditioning system in a heating mode according to a specific embodiment of the present application
- Fig. 3 shows a schematic structural diagram of an air conditioning system in a cooling mode according to another specific embodiment of the present application
- Fig. 4 shows a schematic structural diagram of an air conditioning system in a heating mode according to another specific embodiment of the present application.
- an embodiment of one aspect of the present application provides an air conditioning system, including a high-pressure pipe, a low-pressure pipe, an indoor heat exchanger 10, an outdoor heat exchanger 20, a leak-free thermal expansion valve 30, and a transformer.
- the capacity compressor 40 the high-pressure pipe (for example, the exhaust pipe 41 of the variable capacity compressor 40, which is connected to the exhaust port 433) is used to circulate the high-pressure refrigerant; the low-pressure pipe (such as the suction pipe 42 of the variable capacity compressor 40, Connected to the suction port) for the circulation of low-pressure refrigerant, the low-pressure pipe and the high-pressure pipe can be connected; the indoor heat exchanger 10 is connected with one of the high-pressure pipe and the low-pressure pipe; the outdoor heat exchanger 20 is connected with the high-pressure pipe and The other one of the low pressure pipes is connected; the non-leakage thermal expansion valve 30 is connected between the indoor heat exchanger 10 and the outdoor heat exchanger 20; the variable capacity compressor 40 includes a casing 43, a first cylinder 44 and a second cylinder 45 , The housing 43 is provided with a suction port (specifically including a first suction port 431 and a second suction port 432) and an exhaust port 433; the first cylinder 44 is provided with
- the air conditioning system provided by the embodiments of the present application, on the one hand, by disposing a leak-free thermal expansion valve 30 between the indoor heat exchanger 10 and the outdoor heat exchanger 20, the high and low pressure sides of the air conditioning system can be blocked after the variable capacity compressor 40 is stopped.
- the refrigerant does not allow the refrigerant to be mixed to achieve pressure or temperature balance (the compressor cylinder itself has a good sealing effect when it is stopped, so the refrigerant cannot achieve rapid balance through the compressor cylinder), so that the indoor heat exchanger can be used.
- the residual cooling or heat in the air conditioning system can improve the annual energy efficiency of the air conditioning system.
- the non-leakage thermal expansion valve 30 is a thermal expansion valve that normally throttles when the high and low pressure difference is large, and shuts off when the pressure difference between the two sides drops to a certain extent, so that it can be When the variable capacity compressor 40 is stopped, it effectively plays a role of keeping the high-temperature high-pressure refrigerant and the low-temperature low-pressure refrigerant in the condenser and the evaporator, respectively.
- the non-leakage thermal expansion valve 30 completely cuts off the pipeline between the indoor heat exchanger 10 and the outdoor heat exchanger 20 when the variable capacity compressor 40 is stopped.
- the high and low pressures cannot be completely balanced, so the variable capacity When the compressor 40 restarts, it will have a greater start impact on the variable capacity compressor 40 (especially the rotor compressor with a small aerodynamic torque and sensitive to the start pressure difference).
- the refrigerant on the high and low pressure sides can be mixed to achieve rapid The pressure balance ensures the smooth and safe start of the variable capacity compressor 40.
- the first preset duration is related to the mixing speed of the refrigerant, is affected by the pressure difference between the high and low pressure sides, and is also affected by the charge, viscosity and flow resistance of the refrigerant.
- the first preset duration is related to the mixing speed of the refrigerant, is affected by the pressure difference between the high and low pressure sides, and is also affected by the charge, viscosity and flow resistance of the refrigerant.
- variable capacity compressor 40 by configuring the variable capacity compressor 40 with the first cylinder 44 and the second cylinder 45, the operating capacity can be adjusted according to the indoor cooling or heating load, thereby avoiding the compressor that exists in the fixed-speed air conditioning system under partial load.
- the SEER is much higher than the fixed speed air conditioning system, although still lower than the inverter air conditioning system, but its cost is much lower than the inverter air conditioning system, taking into account low cost and high efficiency.
- the variable capacity compressor 40 is a two-cylinder variable capacity rotary compressor, and also includes a motor 46 and a crankshaft 47.
- the first cylinder 44, the second cylinder 45 and the motor 46 are mounted on the same crankshaft 47, and the crankshaft 47 rotates with the motor 46.
- the rotation drives the first cylinder 44 and the second cylinder 45 to operate.
- a gas-liquid separator 50 is also provided on the suction pipe 42 of the variable capacity compressor 40.
- the first cylinder 44 adopts the variable unloading method of the sliding vane groove pressure, and determines whether the cylinder is working by controlling the pressure of the sliding vane cavity.
- the pressure of the high-pressure refrigerant in the high-pressure pipe and the exhaust port of the variable capacity compressor 40 The pressure of 433 is the same, both are Pd.
- the pressure of the low-pressure refrigerant in the low-pressure pipe is the same as the pressure of the suction port of the variable capacity compressor 40, both are Ps.
- the pressure relief hole 443 of the first cylinder 44 is at the same time as the high-pressure pipe and The low-pressure pipe can be connected and disconnected. When the pressure relief hole 443 is connected to the high pressure pipe, the first cylinder 44 can work normally, that is, it can compress gas normally; when the pressure relief hole 443 is connected to the low pressure pipe, the first cylinder 44 is in and out of The pressure is the same and unloaded.
- the second cylinder 45 is a cylinder of an ordinary rotary compressor. When the motor 46 is energized, the second cylinder 45 always works, that is, it can always compress gas.
- the present application is provided with a leak-free thermal expansion valve 30, which can isolate high-temperature refrigerant and low-temperature refrigerant when the variable-capacity compressor 40 is stopped, so as to utilize the residual cold or heat in the indoor heat exchanger 10 to improve the performance of the air conditioning system. Energy efficiency throughout the year.
- the low-pressure pipe, the high-pressure pipe of the air conditioning system, and the pressure relief hole 443 of the first cylinder 44 of the variable capacity compressor 40 can be connected on and off. There are three on-off states between the three, which can be in different timings.
- the first is to connect the low-pressure pipe and the high-pressure pipe before starting the variable-capacity compressor 40 to achieve rapid pressure balance on the high and low-pressure sides to ensure the safety of the variable-capacity compressor 40;
- second when the variable-capacity compressor 40 is started, the The low-pressure pipe communicates with the pressure relief hole 443 to unload the first cylinder 44, so that the variable capacity compressor 40 only runs at a partial capacity;
- the third is to connect the high pressure pipe to the pressure relief hole 443 when the variable capacity compressor 40 is started
- a cylinder 44 works normally.
- the latter two on-off states respectively correspond to the two operating capacities of the variable capacity compressor 40, and switching between the two can realize the operating capacity switching of the variable capacity compressor 40, which helps to improve seasonal energy efficiency.
- variable capacity compressor 40 when the variable capacity compressor 40 is stopped and the non-leakage thermal expansion valve 30 acts as a blocking function, the on and off states of the above three need not be changed, that is, it is not necessary to switch the operating capacity of the variable capacity compressor 40.
- the present application can effectively utilize the residual cooling or waste heat by configuring the non-leakage thermal expansion valve 30, and use the different working states of a set of on-off structures at different timings, and at the same time realize the safe starting and operating capacity switching of the variable capacity compressor 40. While improving the annual energy efficiency of the air-conditioning system, it is convenient for practical applications and has a lower cost.
- the air conditioning system further includes: a three-way valve 60, the first port 61 of the three-way valve 60 is connected to the pressure relief hole 443, and the second port 62 of the three-way valve 60 Connected to the high-pressure pipe, and the third port 63 of the three-way valve 60 is connected to the low-pressure pipe.
- an on-off solution between the high-pressure pipe, the low-pressure pipe, and the pressure relief hole 443 is specifically defined.
- the three-way valve 60 By setting the three-way valve 60, the three ports of which are respectively connected to the pressure relief hole 443, the high pressure pipe and the low pressure pipe, different conduction states among the three can be realized, and different operating states of the air conditioning system can be switched.
- the three-way valve 60 has three conduction states: in the first conduction state, the first port 61 and the second port 62 are conductive, and the third port 63 is disconnected.
- the pressure relief hole 443 and The high-pressure pipe is connected, the first cylinder 44 can work normally, and the variable capacity compressor 40 runs at full capacity; in the second conduction state, the first port 61 and the third port 63 are connected, and the second port 62 is disconnected.
- the pressure relief hole 443 is connected with the low pressure pipe, the first cylinder 44 is unloaded, and the variable capacity compressor 40 only runs at a partial capacity; in the third conduction state, the second port 62 and the third port 63 are connected, and the first The opening of the port 61 can achieve rapid pressure balance before the variable capacity compressor 40 is started, which ensures the safety of the variable capacity compressor 40 restarting.
- This solution uses only one three-way valve 60 to switch between the full-capacity operation mode and the partial-capacity operation mode of the variable-capacity compressor 40.
- the variable-capacity compressor 40 When the variable-capacity compressor 40 is stopped, the high and low pressure difference is maintained to make full use of the air conditioning system.
- Three functions such as the residual cooling or waste heat in the indoor heat exchanger 10, and achieving high and low pressure balance before the variable capacity compressor 40 starts to avoid the variable capacity compressor 40 starting on load, while achieving the improvement of the annual energy efficiency of the air conditioning system , To achieve the purpose of reducing system costs.
- the three-way valve 60 can be various types of valves.
- an electromagnetic three-way valve 60 can be used to facilitate automatic control.
- the air conditioning system further includes a first solenoid valve 70 and a second solenoid valve 80.
- the first solenoid valve 70 is connected between the pressure relief hole 443 and the high pressure pipe.
- the solenoid valve 80 is connected between the pressure relief hole 443 and the low pressure pipe.
- another on-off solution between the high-pressure pipe, the low-pressure pipe, and the pressure relief hole 443 is specifically defined.
- the first solenoid valve 70 between the pressure relief hole 443 and the high pressure pipe, and the second solenoid valve 80 between the pressure relief hole 443 and the low pressure pipe, the first cylinder 44 can be made normal when only the first solenoid valve 70 is opened.
- the pressure difference is used to make full use of the remaining cold or heat in the indoor heat exchanger 10 of the air conditioning system, and to achieve high and low pressure balance before the variable capacity compressor 40 starts to avoid the variable capacity compressor 40 starting on load.
- the structure is simple and easy Control, and low cost.
- the air conditioning system further includes: a four-way valve 90, the first interface 91 of the four-way valve 90 is connected to the exhaust port 433, and the second interface 92 of the four-way valve 90 It is connected to the outdoor heat exchanger 20, the third port 93 of the four-way valve 90 is connected to the suction port, and the fourth port 94 of the four-way valve 90 is connected to the indoor heat exchanger 10.
- the air-conditioning system is also provided with a four-way valve 90, which has four ports, respectively connected to the exhaust port 433 of the variable capacity compressor 40, the outdoor heat exchanger 20, and the variable capacity compressor 40
- the suction port and the indoor heat exchanger 10 are connected.
- the four-way valve 90 has two communication states to switch between the cooling mode and the heating mode. As shown in Figures 1 and 3, in the first communication state, the first interface 91 and the second interface 92 are in communication, that is, the exhaust port 433 is in communication with the outdoor heat exchanger 20, and the outdoor heat exchanger 20 serves as a condenser.
- the third interface 93 and the fourth interface 94 communicate, that is, the suction port communicates with the indoor heat exchanger 10, the indoor heat exchanger 10 acts as an evaporator, and the air conditioning system runs in the cooling mode; as shown in Figures 2 and 4, in the second connection
- the first interface 91 and the fourth interface 94 communicate, that is, the exhaust port 433 communicates with the indoor heat exchanger 10, the indoor heat exchanger 10 acts as a condenser, and the second interface 92 communicates with the third interface 93, that is, suction
- the port communicates with the outdoor heat exchanger 20, the outdoor heat exchanger 20 serves as an evaporator, and the air conditioning system operates in a heating mode.
- both ends of the high-pressure pipe are respectively connected to the first port 91 and the exhaust port 433, and both ends of the low-pressure pipe are respectively connected to the third port 93 and the suction port.
- one arrangement scheme of the high-pressure pipe and the low-pressure pipe is specifically defined.
- the two are directly connected to the exhaust port 433 and the suction port respectively, and are adjacent to the pressure relief hole 443, which can shorten the layout of the pipeline.
- the two ends of one of the high-pressure pipe and the low-pressure pipe are respectively connected to the indoor heat exchanger 10 and the non-leakage thermal expansion valve 30, and the two ends of the other of the high-pressure pipe and the low-pressure pipe are respectively connected to the outdoor heat exchanger 20 and 30 without leakage thermal expansion valve.
- another arrangement scheme of the high-pressure pipe and the low-pressure pipe is specifically defined. Since the leak-free thermal expansion valve 30 is connected between the indoor heat exchanger 10 and the outdoor heat exchanger 20, when the air-conditioning system is operating normally, the pipelines connected to both ends are high-pressure pipes and low-pressure pipes, which can also be switched The capacity of the variable capacity compressor 40 acts to quickly balance the pressure before the variable capacity compressor 40 starts. The difference between this solution and the previous solution is that the pipelines at both ends of the non-leakage thermal expansion valve 30 are not constant high-pressure pipes or low-pressure pipes. When the air conditioning system is running in the cooling mode, the outdoor heat exchanger 20 is on the high-pressure side.
- the indoor heat exchanger 10 is on the low-pressure side
- the pipeline between the outdoor heat exchanger 20 and the non-leakage thermal expansion valve 30 is a high-pressure pipe
- the pipeline between the indoor heat exchanger 10 and the non-leakage thermal expansion valve 30 is a low-pressure pipe Pipes, and vice versa, interchange, so I won’t repeat them here.
- the non-leakage thermal expansion valve 30 is a one-way throttling element, which only acts as a throttling function when the refrigerant flows from the outdoor heat exchanger 20 to the indoor heat exchanger 10, and only when the refrigerant flows in the reverse direction.
- the air conditioning system also includes: a one-way throttling device (such as a one-way throttling short pipe 100), the one-way throttling device is connected to the non-leakage thermal expansion valve 30, only in the refrigeration
- a one-way throttling device such as a one-way throttling short pipe 100
- the one-way throttling device is connected to the non-leakage thermal expansion valve 30, only in the refrigeration
- the non-leakage thermal expansion valve 30 is specifically defined as a one-way throttling element, which only plays a throttling role when the refrigerant flows in the forward direction, and only plays a role of circulation when the refrigerant flows in the reverse direction.
- a one-way throttling device whose throttling direction is opposite to that of the non-leakage thermal expansion valve 30 is also provided.
- the one-way throttling device is also a one-way throttling element. , Can ensure the smooth throttling of refrigerant in both cooling mode and heating mode.
- the non-leakage thermal expansion valve 30 includes a valve body 31, a first valve port 32, a second valve port 33, an outer balance pipe 34, and a temperature sensing body 31 connected to the valve body 31.
- the first valve port 32 is directly or indirectly connected to the outdoor heat exchanger 20; the second valve port 33 is directly or indirectly connected to the indoor heat exchanger 10; the outer balance pipe 34 is connected to the suction port; the temperature sensing package 35 Set the pipeline between the outer balance pipe 34 and the suction port, and close to the pipe junction point of the outer balance pipe 34 and the suction port; wherein the pressure difference between the first valve port 32 and the second valve port 33 is greater than or equal to When the pressure difference is conducted and the refrigerant flows from the first valve port 32 to the second valve port 33, the leak-free thermal expansion valve 30 plays a throttling role; the pressure difference between the first valve port 32 and the second valve port 33 When the conduction pressure difference is greater than or equal to and the refrigerant flows from the second valve port 33 to the first valve port 32, the non-leakage thermal expansion valve 30 plays a role of circulation; the pressure at the first valve port 32 and the second valve port 33 When the difference is smaller than the conduction pressure difference, the non-leakage thermal
- the non-leakage thermal expansion valve 30 is a one-way throttle and a throttling element with pressure maintaining function, which can meet the requirements of variable capacity compression
- the machine 40 is turned on during operation to ensure the smooth throttling of the refrigerant, and it is turned off when the pressure difference between the high and low pressure sides is reduced to avoid mixing of the refrigerant on the high and low pressure sides, so that the residual cooling or residual heat in the indoor heat exchanger 10 can be utilized, Improve the annual energy efficiency of the air conditioning system.
- the one-way throttling short pipe 100 and the non-leakage thermal expansion valve 30 can be connected in series or parallel.
- the one-way throttling short pipe 100 can be connected to the first valve port 32 of the non-leakage thermal expansion valve 30. It can also be connected to the side where the second valve port 33 is located. Specifically, the short one-way throttle tube 100 has a forward end and a reverse end. When the short one-way throttle tube 100 is connected in series on the side where the second valve port 33 is located, its reverse end and the second valve port 33 The positive end is connected to one end of the indoor heat exchanger 10, that is, the second valve port 33 and one end of the indoor heat exchanger 10 are indirectly connected via a one-way throttling short pipe 100.
- the one-way throttling short tube 100 When the refrigerant flows from the reverse end to the forward end, the one-way throttling short tube 100 has no throttling function and only plays a role of circulation; when the refrigerant flows from the forward end to the reverse end, the one-way throttling short tube 100 Play a throttling role.
- the value range of the first preset duration is 3 seconds to 60 seconds.
- the value range of the first preset duration is specifically limited to be 3 seconds to 60 seconds.
- the lower limit value can ensure the effective balance of the pressure difference between the high and low pressure sides, and ensure the smooth and safe start of the variable capacity compressor 40.
- the upper limit value can help control the pressure adjustment time and avoid the influence of the air-conditioning system starting time for too long. User experience.
- the value range of the first preset duration can be reduced to 3 seconds to 55 seconds, and its typical value range is 5 seconds to 15 seconds.
- the air conditioning system further includes an indoor fan 110 and a controller (not shown in the figure).
- the indoor fan 110 is arranged toward the indoor heat exchanger 10; the controller and the indoor fan 110 Electrically connected, the controller controls the indoor fan 110 to continue to run for a second preset time period after the variable capacity compressor 40 is stopped.
- the air conditioning system further includes an indoor fan 110 disposed toward the indoor heat exchanger 10, and a controller electrically connected to the indoor fan 110, and the indoor fan 110 is controlled by the controller to continue to run for a second preset period of time after shutdown , The air can be continued to be supplied to the room, thereby making full use of the residual cold or residual heat of the refrigerant remaining in the indoor heat exchanger 10 after shutdown, which is beneficial to increase the energy efficiency of the air conditioning system.
- the air conditioning system further includes an outdoor fan 120 arranged toward the outdoor heat exchanger 20 to improve the heat exchange efficiency of the outdoor heat exchanger 20. It is conceivable that all electrical components in the air conditioning system can be controlled by the controller, such as the three-way valve 60, the first solenoid valve 70, the second solenoid valve 80, and the four-way valve 90.
- the value range of the second preset duration is 60 seconds to 90 seconds.
- the value range of the second preset time period is specifically limited to 60 seconds to 90 seconds.
- the lower limit value can ensure that the residual cold or residual heat of the refrigerant in the indoor heat exchanger 10 is fully utilized, and the air conditioning is increased.
- the upper limit can avoid blowing hot or cold air into the room after the residual cold or residual heat is exhausted, which helps to improve the health and comfort of users.
- the air conditioning system shown in Figures 1 and 2 includes an indoor heat exchanger 10, an outdoor heat exchanger 20, a non-leakage thermal expansion valve 30, a variable capacity compressor 40, a gas-liquid separator 50, a three-way valve 60, four
- the through valve 90, the one-way throttle short pipe 100, the indoor fan 110, the outdoor fan 120, etc., refer to the above-mentioned embodiments for the specific structure thereof.
- the air conditioning system shown in FIG. 1 can realize the switching between the full capacity operation mode and the partial capacity operation mode of the variable capacity compressor 40 under the control of the three-way valve 60. In each operating mode, it can be divided into compressor operating phase, pressure maintaining phase during compressor shutdown, and pressure unloading phase before compressor startup.
- variable capacity compressor 40 can operate at full capacity or partial capacity; in the shutdown and pressure maintaining phase, the variable capacity compressor 40 stops running, but the outdoor heat exchanger 20 maintains a high pressure state, and the indoor heat exchanger 10 The internal pressure is kept low (when it is in the cooling mode, the opposite is true in the heating mode); in the pressure unloading stage, the variable capacity compressor 40 is in a shutdown state, but the suction pipe 42 and the exhaust pipe 41 of the variable capacity compressor 40 The pressure difference quickly reaches a state close to equilibrium, so as to reduce the start-up pressure difference of the variable-capacity compressor 40 and prepare for the next startup of the variable-capacity compressor 40 and re-enter the operating stage. details as follows:
- variable capacity compressor 40 runs at full capacity
- the three-way valve 60 is in the first conducting state
- the four-way valve 90 is in the first communicating state (as shown in Figure 1 In the cooling mode) or in the second communication state (in the heating mode as shown in Figure 2).
- the first port 61 and the second port 62 are connected, and the pressure relief hole 443 of the first cylinder 44 of the variable displacement compressor 40 communicates with the exhaust port 433.
- the motor 46 of the variable capacity compressor 40 is energized, the second cylinder 45 is driven to operate, compressing the gas at the second suction hole 451 to a high pressure, and discharges it into the casing of the variable capacity compressor 40 through the second exhaust hole 452 Inside the body 43, the outside of the variable displacement compressor 40 is further discharged through the exhaust port 433 of the variable displacement compressor 40.
- the pressure relief hole 443 of the first cylinder 44 is in communication with the exhaust port 433, the high-pressure gas discharged from the exhaust port 433 is introduced into the pressure relief hole 443, so that the pressure relief hole 443 is also in a high pressure state.
- One cylinder 44 can work normally, that is, both the first cylinder 44 and the second cylinder 45 can compress gas, and the variable capacity compressor 40 is in a full capacity operation mode.
- the first cylinder 44 sucks in gas from the first suction hole 441, compresses and boosts the gas, and discharges it into the casing 43 of the variable capacity compressor 40 through the first exhaust hole 442. After the gases discharged into the casing 43 by the two cylinders 45 are mixed, they are discharged out of the variable displacement compressor 40 through the exhaust port 433 of the variable displacement compressor 40 together.
- the refrigerant discharged from the variable capacity compressor 40 sequentially passes through the first port 91 of the four-way valve 90 ⁇ the second port 92 of the four-way valve 90 ⁇ the outdoor heat exchanger 20 ⁇ Leak-free thermal expansion valve 30 ⁇ One-way throttling short pipe 100 ⁇ Indoor heat exchanger 10 ⁇ The fourth port 94 of the four-way valve 90 ⁇ The third port 93 ⁇ Gas-liquid separator 50, return to the variable capacity compressor 40
- the first suction port 431 and the second suction port 432 form a complete refrigeration cycle.
- the outdoor heat exchanger 20 is in a high-pressure condensing state, and the indoor heat exchanger 10 is in a low-pressure evaporating state.
- the two sides of the non-leakage thermal expansion valve 30 are in a state of large pressure difference, so the non-leakage thermal expansion valve 30 is in a state of conduction and normal throttling.
- the one-way throttling short tube 100 is in a reverse flow state. At this time, the one-way throttling short tube 100 has no throttling function, but only a circulation function.
- the refrigerant discharged from the variable capacity compressor 40 sequentially passes through the first port 91 of the four-way valve 90 ⁇ the fourth port 94 of the four-way valve 90 ⁇ indoor heat exchange Reactor 10 ⁇ One-way throttling short pipe 100 ⁇ Leak-free thermal expansion valve 30 ⁇ Outdoor heat exchanger 20 ⁇ The second interface 92 of the four-way valve 90 ⁇ The third interface 93 of the four-way valve 90 ⁇ Gas-liquid separator 50 ⁇
- the first suction port 431 and the second suction port 432 of the variable capacity compressor 40 form a complete heating cycle.
- the one-way throttling short tube 100 is in a positive flow state, and the one-way throttling short tube 100 plays a throttling role at this time.
- the indoor heat exchanger 10 is in a high-pressure condensing state, and the outdoor heat exchanger 20 is in a low-pressure evaporation state, and the two sides of the non-leakage thermal expansion valve 30 are in a reverse large pressure difference state.
- the non-leakage thermal expansion valve 30 has no throttling function and only has a circulation function.
- the one-way throttling short tube 100 is in a positive flow state, and the one-way throttling short tube 100 plays a throttling role at this time.
- the indoor fan 110 and the outdoor fan 120 continue to operate, and the indoor fan 110 brings the cold or heat of the indoor heat exchanger 10 to the room through air circulation to cool or heat the room.
- variable displacement compressor 40 stops running, and the three-way valve 60 maintains the first conducting state.
- the pressure on both sides of the non-leakage thermal expansion valve 30 will initially tend to balance, that is, the refrigerant on the high pressure side will continue to flow to the low pressure side, so that the pressure on the high pressure side will decrease, and The pressure on the low pressure side decreases.
- the pressure difference between the two sides of the non-leakage thermal expansion valve 30 is reduced to the cut-off pressure of the non-leakage thermal expansion valve 30, the non-leakage thermal expansion valve 30 will be cut off.
- the refrigerant on the high pressure side can no longer flow to the low pressure side.
- the refrigerant that still has a certain pressure difference is restricted to the high pressure side and low pressure side of the system respectively.
- variable capacity compressor 40 When the variable capacity compressor 40 just shuts down, if the air-conditioning system is working in the cooling mode before shutting down, after shutting down the outdoor heat exchanger 20 still has a higher temperature high-pressure refrigerant, while the indoor heat exchanger 10 still has If the indoor fan 110 is kept running at this time, the low-pressure refrigerant with lower temperature can continue to send cold air to the room, so as to make full use of the residual cooling of the refrigerant in the indoor heat exchanger 10 after the variable capacity compressor 40 stops. , Which is conducive to increasing the cooling season energy efficiency of the air-conditioning system and improving the annual energy efficiency ratio of the air-conditioning system.
- variable capacity compressor 40 When the variable capacity compressor 40 just shuts down, if the air-conditioning system is working in the heating mode before shutting down, the high-temperature high-pressure refrigerant still remains in the indoor heat exchanger 10 after shutting down, while the outdoor heat exchanger 20 still remains There is a low-pressure refrigerant with a lower temperature. At this time, if the indoor fan 110 is kept running, the hot air can continue to be sent to the room, thereby making full use of the refrigerant remaining in the indoor heat exchanger 10 after the variable capacity compressor 40 stops.
- the waste heat is conducive to increasing the energy efficiency of the air-conditioning system during the heating season and improving the annual energy efficiency ratio of the air-conditioning system.
- the duration of the shutdown pressure maintaining phase is generally 3 minutes to 5 minutes.
- the variable capacity compressor 40 and the outdoor fan 120 remain in a stopped state.
- the indoor fan 110 continues to operate for less than or equal to the shutdown time of the variable capacity compressor 40, typically Specifically, the indoor fan 110 continues to operate for 60 to 90 seconds after the variable capacity compressor 40 is stopped.
- variable capacity compressor 40 maintains a stopped state, and the three-way valve 60 switches to the third conduction state, and delays a period of time t d ( That is, the first preset duration) t d is 3 seconds to 60 seconds, typically 5 seconds to 15 seconds.
- the third port 63 and the second port 62 are connected, and the discharge port 433 of the variable displacement compressor 40 is in communication with the first suction port 431 and the second suction port 432 .
- the high-pressure gas refrigerant in the discharge pipe 41 of the variable capacity compressor 40 will immediately be bypassed to the first suction port 431 and the first suction port 431 of the variable capacity compressor 40 through the second port 62 and the third port 63 of the three-way valve 60
- the pressure difference at the suction and exhaust ports 433 of the first cylinder 44 and the second cylinder 45 becomes smaller and smaller, and the pressure between the outdoor heat exchanger 20 and the indoor heat exchanger 10 The difference is getting smaller and smaller.
- the pressure difference at the suction and discharge ports 433 of the first cylinder 44 and the second cylinder 45 is nearly equal, that is, pressure unloading is realized.
- variable capacity compressor 40 When the delay time t d ends, the pressure unloading phase ends. Then it returns to the operation stage of the variable capacity compressor 40, the three-way valve 60 is switched back to the first conduction state, and the variable capacity compressor 40 starts at the same time. Since the high and low pressures are balanced during the pressure unloading stage, the variable capacity compressor 40 has a small starting load and can start smoothly.
- Variable capacity compressor 40 operates at partial capacity
- variable capacity compressor 40 is running at partial capacity
- the three-way valve 60 is in the second conducting state
- the four-way valve 90 is in the first communicating state (as shown in Figure 1 In the cooling mode) or in the second communication state (in the heating mode as shown in Figure 2).
- the first port 61 and the third port 63 are connected, the pressure relief hole 443 of the first cylinder 44 of the variable capacity compressor 40 and the suction pipe of the variable capacity compressor 40 42 communicates with the first suction hole 441 of the first cylinder 44.
- the first cylinder 44 is unloaded and cannot compress gas normally, while the second cylinder 45 can still compress gas normally.
- variable capacity compressor 40 When the motor 46 of the variable capacity compressor 40 is energized, the second cylinder 45 is driven to operate, compressing the gas at the second suction hole 451 to a high pressure, and discharges it into the casing of the variable capacity compressor 40 through the second exhaust hole 452 Inside the body 43, the outside of the variable displacement compressor 40 is further discharged through the exhaust port 433 of the variable displacement compressor 40. Since the pressure relief hole 443 of the first cylinder 44 is connected to the suction port, the pressure at the pressure relief hole 443 and the pressure at the suction port are both low pressure, so when the motor 46 is energized, the first cylinder 44 can only run idly The gas cannot be compressed normally. Therefore, the variable capacity compressor 40 is in a partial capacity operation mode.
- the refrigerant discharged from the variable capacity compressor 40 sequentially passes through the first port 91 of the four-way valve 90 ⁇ the second port 92 of the four-way valve 90 ⁇ the outdoor heat exchanger 20 ⁇ Leak-free thermal expansion valve 30 ⁇ One-way throttling short pipe 100 ⁇ Indoor heat exchanger 10 ⁇ The fourth port 94 of the four-way valve 90 ⁇ The third port 93 ⁇ Gas-liquid separator 50, return to the variable capacity compressor 40
- the second suction port 432 forms a complete refrigeration cycle.
- the outdoor heat exchanger 20 is in a high-pressure condensing state
- the indoor heat exchanger 10 is in a low-pressure evaporating state.
- the two sides of the non-leakage thermal expansion valve 30 are in a state of large pressure difference, so the non-leakage thermal expansion valve 30 is in a state of conduction and normal throttling.
- the one-way throttling short tube 100 is in a reverse flow state. At this time, the one-way throttling short tube 100 has no throttling function, but only a circulation function.
- the refrigerant discharged from the variable capacity compressor 40 sequentially passes through the first port 91 of the four-way valve 90 ⁇ the fourth port 94 of the four-way valve 90 ⁇ indoor heat exchange Reactor 10 ⁇ One-way throttling short pipe 100 ⁇ Leak-free thermal expansion valve 30 ⁇ Outdoor heat exchanger 20 ⁇ The second interface 92 of the four-way valve 90 ⁇ The third interface 93 of the four-way valve 90 ⁇ Gas-liquid separator 50 ⁇
- the second suction port 432 of the variable capacity compressor 40 forms a complete heating cycle.
- the one-way throttling short tube 100 is in a positive flow state, and the one-way throttling short tube 100 plays a throttling role at this time.
- the indoor heat exchanger 10 is in a high-pressure condensing state, and the outdoor heat exchanger 20 is in a low-pressure evaporation state, and the two sides of the non-leakage thermal expansion valve 30 are in a reverse large pressure difference state.
- the non-leakage thermal expansion valve 30 has no throttling function and only has a circulation function.
- the one-way throttling short tube 100 is in a positive flow state, and the one-way throttling short tube 100 plays a throttling role at this time.
- the indoor fan 110 and the outdoor fan 120 continue to operate, and the indoor fan 110 brings the cold or heat of the indoor heat exchanger 10 to the room through air circulation to cool or heat the room.
- variable displacement compressor 40 stops running, and the three-way valve 60 maintains the second conduction state.
- the pressure on both sides of the non-leakage thermal expansion valve 30 will initially tend to balance, that is, the refrigerant on the high pressure side will continue to flow to the low pressure side, so that the pressure on the high pressure side will decrease, and The pressure on the low pressure side decreases.
- the pressure difference between the two sides of the non-leakage thermal expansion valve 30 is reduced to the cut-off pressure of the non-leakage thermal expansion valve 30, the non-leakage thermal expansion valve 30 will be cut off.
- the refrigerant on the high pressure side can no longer flow to the low pressure side.
- the refrigerant that still has a certain pressure difference is restricted to the high pressure side and low pressure side of the system respectively.
- variable capacity compressor 40 When the variable capacity compressor 40 just shuts down, if the air-conditioning system is working in the cooling mode before shutting down, after shutting down the outdoor heat exchanger 20 still has a higher temperature high-pressure refrigerant, while the indoor heat exchanger 10 still has If the indoor fan 110 is kept running at this time, the low-pressure refrigerant with lower temperature can continue to send cold air to the room, so as to make full use of the residual cooling of the refrigerant in the indoor heat exchanger 10 after the variable capacity compressor 40 stops. , Which is conducive to increasing the cooling season energy efficiency of the air-conditioning system and improving the annual energy efficiency ratio of the air-conditioning system.
- variable capacity compressor 40 When the variable capacity compressor 40 just shuts down, if the air-conditioning system is working in the heating mode before shutting down, the high-temperature high-pressure refrigerant still remains in the indoor heat exchanger 10 after shutting down, while the outdoor heat exchanger 20 still remains There is a low-pressure refrigerant with a lower temperature. At this time, if the indoor fan 110 is kept running, the hot air can continue to be sent to the room, thereby making full use of the refrigerant remaining in the indoor heat exchanger 10 after the variable capacity compressor 40 stops.
- the waste heat is conducive to increasing the energy efficiency of the air-conditioning system during the heating season and improving the annual energy efficiency ratio of the air-conditioning system.
- the duration of the shutdown pressure maintaining phase is generally 3 minutes to 5 minutes.
- the variable capacity compressor 40 and the outdoor fan 120 remain in a stopped state.
- the indoor fan 110 continues to operate for less than or equal to the shutdown time of the variable capacity compressor 40, typically Specifically, the indoor fan 110 continues to operate for 60 to 90 seconds after the variable capacity compressor 40 is stopped.
- variable displacement compressor 40 maintains a stopped state, and the three-way valve 60 switches to the third conduction state, and is delayed for a period of time t d in the third conduction state.
- the third port 63 and the second port 62 are connected, and the discharge port 433 of the variable displacement compressor 40 is in communication with the first suction port 431 and the second suction port 432 .
- the high-pressure gas refrigerant in the discharge pipe 41 of the variable capacity compressor 40 will immediately be bypassed to the first suction port 431 and the first suction port 431 of the variable capacity compressor 40 through the second port 62 and the third port 63 of the three-way valve 60
- the pressure difference at the suction and exhaust ports 433 of the first cylinder 44 and the second cylinder 45 becomes smaller and smaller, and the pressure between the outdoor heat exchanger 20 and the indoor heat exchanger 10 The difference is getting smaller and smaller.
- the pressure difference at the suction and discharge ports 433 of the first cylinder 44 and the second cylinder 45 is nearly equal, that is, pressure unloading is realized.
- variable capacity compressor 40 When the delay time t d ends, the pressure unloading phase ends. Then it returns to the operation stage of the variable capacity compressor 40, the three-way valve 60 switches back to the second conducting state, and the variable capacity compressor 40 starts at the same time. Since the high and low pressures are balanced during the pressure unloading stage, the variable capacity compressor 40 has a small starting load and can start smoothly.
- the air conditioning system shown in Figures 3 and 4 includes an indoor heat exchanger 10, an outdoor heat exchanger 20, a non-leakage thermal expansion valve 30, a variable capacity compressor 40, a gas-liquid separator 50, a first solenoid valve 70, The second solenoid valve 80, the four-way valve 90, the one-way throttling short pipe 100, the indoor fan 110, the outdoor fan 120, etc., are different from the first embodiment in that the first solenoid valve 70 and the second solenoid valve 80 are used. Replace the three-way valve 60.
- first solenoid valve 70 When the first solenoid valve 70 is turned on and the second solenoid valve 80 is turned off, it is equivalent to the three-way valve 60 being in the first conductive state; when the first solenoid valve 70 is turned off and the second solenoid valve 80 is turned on, it is equivalent to three The way valve 60 is in the second conducting state; when the first solenoid valve 70 is conducting and the second solenoid valve 80 is conducting, it is equivalent to the three-way valve 60 being in the third conducting state. Therefore, by combining the switching states of the first solenoid valve 70 and the second solenoid valve 80, the same function as the first embodiment can be achieved.
- variable capacity compressor 40 can operate at full capacity or partial capacity; in the shutdown and pressure maintaining phase, the variable capacity compressor 40 stops running, but the outdoor heat exchanger 20 maintains a high pressure state, and the indoor heat exchanger 10 The internal pressure is kept low (when it is in the cooling mode, the opposite is true in the heating mode); in the pressure unloading stage, the variable capacity compressor 40 is in a shutdown state, but the suction pipe 42 and the exhaust pipe 41 of the variable capacity compressor 40 The pressure difference quickly reaches a state close to equilibrium, so as to reduce the start-up pressure difference of the variable-capacity compressor 40 and prepare for the next startup of the variable-capacity compressor 40 and re-enter the operating stage.
- specific embodiment 1 please refer to specific embodiment 1, which will not be repeated here.
- the embodiment of the present application provides an air conditioning system with a non-leakage thermal expansion valve 30 as a throttling element.
- the thermal expansion valve can give full play to its reliability, high throttling efficiency, and ability to maintain suction.
- the gas superheat is the advantage of a stable value; when the compressor is stopped, the refrigerant with a higher temperature and a lower temperature can be restricted to the outdoor heat exchanger 20 or the indoor heat exchanger 10, respectively, so that the high temperature refrigerant and the low temperature
- the refrigerants cannot be mixed with each other, so that the heating capacity of the high-temperature refrigerant and the heat absorption capacity of the low-temperature refrigerant are retained during the compressor shutdown, so that the residual cold or heat in the indoor heat exchanger 10 can be fully utilized, and the air-conditioning system can be effectively improved.
- Seasonal energy efficiency ratio makes the system energy-saving benefits outstanding; at the moment between compressor startup, the high and low pressure sides are connected through the switch of the valve, which can quickly reduce the pressure difference between the compressor cylinder suction and exhaust port 433, and reduce the compressor
- the pressure in the discharge chamber avoids the occurrence of excessive starting current, difficulty in starting, shock, and vibration when the compressor starts again under pressure, which is beneficial to prolong the life of the compressor.
- the embodiments of the present application can realize that the air conditioning system adopts full capacity operation when the load is large, and adopts partial capacity operation when the load is small, thereby further improving the seasonal energy efficiency ratio of the air conditioning system and making the air conditioning system more energy-saving.
- the term “plurality” refers to two or more than two, unless specifically defined otherwise.
- the terms “installed”, “connected”, “connected”, “fixed” and other terms should be understood in a broad sense.
- “connected” can be a fixed connection, a detachable connection, or an integral connection;
- “connected” can be It is directly connected or indirectly connected through an intermediary.
- the specific meanings of the above terms in this application can be understood according to specific circumstances.
Abstract
Description
Claims (10)
- 一种空调系统,其中,包括:高压管,用于供高压制冷剂流通;低压管,用于供低压制冷剂流通,所述低压管与所述高压管可通断连接;室内换热器,所述室内换热器与所述高压管和所述低压管中的一个相连通;室外换热器,所述室外换热器与所述高压管和所述低压管中的另一个相连通;无泄漏热力膨胀阀,连于所述室内换热器和所述室外换热器之间;及变容量压缩机,所述变容量压缩机包括:壳体,所述壳体设有吸气口和排气口;第一气缸,所述第一气缸设有与所述吸气口相连通的第一吸气孔、与所述排气口相连通的第一排气孔,以及同时与所述高压管和所述低压管可通断连接的卸压孔;及第二气缸,所述第二气缸设有与所述吸气口相连通的第二吸气孔,以及与所述排气口相连通的第二排气孔;其中,在所述变容量压缩机启动前,所述高压管和所述低压管相连通,并在第一预设时长后断开。
- 根据权利要求1所述的空调系统,其中,所述空调系统还包括:三通阀,所述三通阀的第一端口与所述卸压孔相连,所述三通阀的第二端口与所述高压管相连,所述三通阀的第三端口与所述低压管相连。
- 根据权利要求1或2所述的空调系统,其中,所述空调系统还包括:第一电磁阀,连于所述卸压孔和所述高压管之间;及第二电磁阀,连于所述卸压孔和所述低压管之间。
- 根据权利要求1至3中任一项所述的空调系统,其中,所述空调系统还包括:四通阀,所述四通阀的第一接口与所述排气口相连,所述四通阀的第 二接口与所述室外换热器相连,所述四通阀的第三接口与所述吸气口相连,所述四通阀的第四接口与所述室内换热器相连。
- 根据权利要求4所述的空调系统,其中,所述高压管的两端分别连接所述第一接口和所述排气口,所述低压管的两端分别连接所述第三接口和所述吸气口;或所述高压管和所述低压管中的一个的两端分别连接所述室内换热器和所述无泄漏热力膨胀阀,所述高压管和所述低压管中的另一个的两端分别连接所述室外换热器和所述无泄漏热力膨胀阀。
- 根据权利要求4或5所述的空调系统,其中,所述无泄漏热力膨胀阀为单向节流元件,仅在制冷剂从室外换热器流向室内换热器时起节流作用,当制冷剂反向流动时仅起流通作用;所述空调系统还包括:单向节流装置,所述单向节流装置与所述无泄漏热力膨胀阀相连,仅在制冷剂从室内换热器流向室外换热器时起节流作用,当制冷剂反向流动时仅起流通作用。
- 根据权利要求6所述的空调系统,其中,所述无泄漏热力膨胀阀包括:阀体;第一阀口,连接所述阀体,所述第一阀口与所述室外换热器直接或间接相连;第二阀口,连接所述阀体,所述第二阀口与所述室内换热器直接或间接相连;外平衡管,连接所述阀体,所述外平衡管与所述吸气口相连通;及感温包,连接所述阀体,所述感温包设置在所述外平衡管与所述吸气口之间的管路上,并靠近所述外平衡管与所述吸气口的管路结合点;其中,在所述第一阀口和所述第二阀口的压差大于等于导通压差,且制冷剂从所述第一阀口流向所述第二阀口的情况下,所述无泄漏热力膨胀阀起节流作用;在所述第一阀口和所述第二阀口的压差大于等于所述导通压差,且制 冷剂从所述第二阀口流向所述第一阀口的情况下,所述无泄漏热力膨胀阀起流通作用;在所述第一阀口和所述第二阀口的压差小于所述导通压差的情况下,所述无泄漏热力膨胀阀关断。
- 根据权利要求1至7中任一项所述的空调系统,其中,所述第一预设时长的取值范围为3秒至60秒。
- 根据权利要求1至8中任一项所述的空调系统,其中,所述空调系统还包括:室内风扇,朝向所述室内换热器设置;控制器,所述控制器与所述室内风扇电连接,所述控制器控制所述室内风扇在所述变容量压缩机停机后继续运行第二预设时长。
- 根据权利要求9所述的空调系统,其中,所述第二预设时长的取值范围为60秒至90秒。
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CN112413918B (zh) * | 2020-11-09 | 2023-07-25 | 深圳供电局有限公司 | 一种低温制冷机 |
CN114179589B (zh) * | 2021-12-08 | 2023-08-18 | 珠海格力电器股份有限公司 | 一种空调系统的控制方法、装置、空调系统和存储介质 |
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