CN101354198B - Air conditioning system - Google Patents
Air conditioning system Download PDFInfo
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- CN101354198B CN101354198B CN2008100947843A CN200810094784A CN101354198B CN 101354198 B CN101354198 B CN 101354198B CN 2008100947843 A CN2008100947843 A CN 2008100947843A CN 200810094784 A CN200810094784 A CN 200810094784A CN 101354198 B CN101354198 B CN 101354198B
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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
- F25B1/00—Compression machines, plants or systems with non-reversible cycle
- F25B1/10—Compression machines, plants or systems with non-reversible cycle with multi-stage compression
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/89—Arrangement or mounting of control or safety devices
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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
- F25B1/00—Compression machines, plants or systems with non-reversible cycle
- F25B1/005—Compression machines, plants or systems with non-reversible cycle of the single unit 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
- 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
- F25B2400/075—Details of compressors or related parts with parallel compressors
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- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Air Conditioning Control Device (AREA)
- Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
Abstract
The invention relates to an air-conditioning system, comprising: a phase separator for separating a gas-phase refrigerant and a liquid-phase refrigerant; an evaporator for evaporating the liquid-phase refrigerant separated by the phase separator; a compressing part for compressing the refrigerant passing through the evaporator and comprising a constant speed compressor and a capacity variable compressor; a gas-phase refrigerant supply passage for supplying the gas-phase refrigerant discharged from the phase separator to the constant speed compressor and the capacity variable compressor; a serial/parallel converting unit provided for connecting the constant speed compressor and the capacity variable compressor in series or in parallel. Thereby, at a normal heating zone, in a state that the constant speed compressor and the capacity variable compressor are connected in parallel, the load is operated partially or least; while at the heating low temperature zone, the constant speed compressor and the capacity variable compressor are connected in series, the gas-phase refrigerant is supplied between the constant speed compressor and the capacity variable compressor, thus, the air-conditioning system has the advantage of maximizing the heat supply capability according to the outside air temperature.
Description
Technical field
The present invention relates to air-conditioning system, being particularly related to the vapor phase refrigerant that compression unit that utilization is made of constant speed compressor and compressor with variable volume separates phase-splitter flows into, and the compressor with variable volume of constant speed compressor can be exchanged into series connection/be connected in parallel, particularly can improve the air-conditioning system of the heat supply efficiency when low temperature heating is provided.
Background technology
In general, air-conditioning system is to utilize compressor, condenser, decompressor and evaporimeter to come the device that freezes and heat indoor, and it is divided into makes cold-producing medium circulation only come to the refrigeration system of indoor cool-air feed and make the cold-producing medium circulation bidirectional optionally turn round refrigeration and heating system (Heat pump) to indoor cool-air feed or heating installation to a direction running.
High more preferred more as above-mentioned air-conditioning system refrigerating efficiency or heat supply efficiency, disclose following air-conditioning system among the Korean registered patent gazette 10-0710311, that is: possesses the two-stage compressor of first and second compression set series connection, and be provided with the phase-splitter that the vapor phase refrigerant in the cold-producing medium is separated with liquid phase refrigerant, and make the vapor phase refrigerant of separating flow into second compression set with cold-producing medium by first compression set by phase-splitter.
In the above-mentioned air-conditioning system, first compression set and second compression set are arranged in the housing, and are moved together by a drive unit.
In above-mentioned air-conditioning system, the vapor phase refrigerant of being separated by phase-splitter is sent to the middle refrigerator pipes of the suction inlet of the outlet that connects above-mentioned first compression set and above-mentioned second compression set, thereby the enthalpy on the increase capacity aspect is poor, increase circulating mass of refrigerant capacity is increased, and on work done during compression, carry out multi-stage compression and reduce power consumption.
Yet there are the following problems according to the air-conditioning system of conventional art.Promptly, at load after a little while, if above-mentioned first compression set and second compression set are driven by a drive unit, then can increase power consumption, and if not to any one optionally drives in above-mentioned first compression set that is connected in a drive unit and second compression set, then the internal structure of two-stage compressor can become complicated.
In addition, as the above-mentioned most important factor that makes the maximization of gas injection effect is the volume ratio of two-stage compressor, and this is for the situation of using a compressor, and existence is fixed because of the limitation volume ratio in the mechanism, and finally can not be corresponding to the shortcoming of various loads.
Summary of the invention
The present invention proposes for the problem that solves above-mentioned conventional art, its purpose is to provide a kind of air-conditioning system, it is when sub-load running or minimum load running, a plurality of compressor parallels are constituted and increase COP, and when certain load is above, the series connection of a plurality of compressors is constituted, and when carrying out multi-stage compression, spray vapor phase refrigerant and obtain best heating capacity.
Another object of the present invention is, a kind of simple air-conditioning system of internal structure that constitutes each compressor of compression unit is provided.
For solving above-mentioned problem,, comprising: the phase-splitter that separates vapor phase refrigerant and liquid phase refrigerant according to air-conditioning system of the present invention; The evaporimeter that will evaporate by the liquid phase refrigerant that above-mentioned phase-splitter separates; The cold-producing medium of above-mentioned evaporimeter is passed through in compression, and comprises the compression unit of constant speed compressor and compressor with variable volume; To supply with stream from the vapor phase refrigerant that the vapor phase refrigerant that above-mentioned phase-splitter is discharged is supplied with between above-mentioned constant speed compressor and compressor with variable volume; For the series/parallel converting unit that above-mentioned constant speed compressor and compressor with variable volume are connected in series or are connected in parallel and be provided with.
Among the present invention, above-mentioned series/parallel converting unit comprises: the suction that the suction passage of above-mentioned constant speed compressor and the suction passage of above-mentioned compressor with variable volume are connected in parallel stream in parallel; The discharge that the discharge stream of above-mentioned constant speed compressor and the discharge stream of above-mentioned compressor with variable volume are connected in parallel stream in parallel; The stream that is connected in series that above-mentioned constant speed compressor and compressor with variable volume are connected in series.
Among the present invention, above-mentioned series/parallel converting unit also comprises the series/parallel switching valve, and this switching valve is to above-mentioned suction stream in parallel, above-mentioned discharge stream in parallel, and control is carried out in the switching of the above-mentioned stream that is connected in series.
Among the present invention, discharge stream and another suction passage of any one is provided with the above-mentioned stream that is connected in series in above-mentioned constant speed compressor and the above-mentioned compressor with variable volume in order to connect.The above-mentioned stream that is connected in series is provided with for the discharge stream that connects above-mentioned constant speed compressor and the suction passage of above-mentioned compressor with variable volume.
Among the present invention, above-mentioned series/parallel switching valve comprises: be arranged at the compressor with variable volume inlet valve on the suction passage of above-mentioned compressor with variable volume; Be arranged at the constant speed compressor dump valve on the discharge stream of above-mentioned constant speed compressor.
Among the present invention, above-mentioned compressor with variable volume inlet valve is arranged between the suction passage of the branching portion of suction passage branch of the suction passage of above-mentioned compressor with variable volume and above-mentioned constant speed compressor and above-mentioned compressor with variable volume and the connecting portion that the above-mentioned stream that is connected in series connects.
Among the present invention, also comprise the vapor phase refrigerant valve that is arranged on the above-mentioned vapor phase refrigerant supply stream.
Among the present invention, also comprise control part, this control part is controlled above-mentioned constant speed compressor and compressor with variable volume, series/parallel switching valve and vapor phase refrigerant valve according to the load of above-mentioned air-conditioning system.
Among the present invention, above-mentioned air-conditioning system also comprises: the outdoor temperature sensor that detects outer temperature degree; According to the testing result of above-mentioned outdoor temperature sensor, control the control part of above-mentioned constant speed compressor and compressor with variable volume, series/parallel switching valve and vapor phase refrigerant valve.
Among the present invention, above-mentioned control part carries out following control, that is: when the external load that is applied by the outside is equivalent to predefined first assumed load, above-mentioned series/parallel switching valve is connected, and above-mentioned vapor phase refrigerant valve is disconnected; When the said external load is equivalent to second assumed load, above-mentioned series/parallel switching valve is disconnected, and make above-mentioned vapor phase refrigerant valve events.Above-mentioned first assumed load is that outer temperature degree is the above condition of predefined first design temperature, and above-mentioned second assumed load is the condition of outer temperature degree for not enough above-mentioned first design temperature.
Among the present invention, when above-mentioned control part is equivalent to predefined the 3rd assumed load when said external load, above-mentioned series/parallel switching valve is disconnected, and above-mentioned vapor phase refrigerant valve is disconnected.Above-mentioned the 3rd assumed load is that outer temperature degree is the following condition of second design temperature that is lower than above-mentioned first design temperature.
According to another side of the present invention,, comprising: the phase-splitter that separates vapor phase refrigerant and liquid phase refrigerant according to air-conditioning system of the present invention; The evaporimeter that will evaporate by the liquid phase refrigerant that above-mentioned phase-splitter separates; The cold-producing medium of above-mentioned evaporimeter is passed through in compression, and comprises the compression unit of constant speed compressor and compressor with variable volume; For the series/parallel converting unit that above-mentioned constant speed compressor and compressor with variable volume are connected in series or are connected in parallel and be provided with; The vapor phase refrigerant valve of adjusting to the refrigerant amount that is injected into above-mentioned compression unit for discharging from above-mentioned phase-splitter; Control the control part of above-mentioned series/parallel converting unit and gas phase refrigerant valve according to the external load that applies by the outside.
Among the present invention, when above-mentioned control part is equivalent to predefined first assumed load when the external load that is applied by the outside, control above-mentioned series/parallel converting unit, so that above-mentioned constant speed compressor and compressor with variable volume are connected in parallel.
Among the present invention, when above-mentioned control part is equivalent to above-mentioned first assumed load when said external load, above-mentioned vapor phase refrigerant valve is disconnected.
Among the present invention, when above-mentioned control part is equivalent to than big second assumed load of above-mentioned first assumed load when said external load, control above-mentioned series/parallel converting unit, so that above-mentioned constant speed compressor and compressor with variable volume are connected in series.
Among the present invention, when above-mentioned control part is equivalent to second assumed load when the said external load, above-mentioned vapor phase refrigerant valve is connected.
Among the present invention, when above-mentioned control part is equivalent to than big the 3rd assumed load of above-mentioned second assumed load when said external load, control above-mentioned series/parallel converting unit,, and above-mentioned vapor phase refrigerant valve is disconnected so that above-mentioned constant speed compressor and compressor with variable volume be connected in series.
According to air-conditioning system of the present invention as constituted above, when the standard heating area, constant speed compressor and compressor with variable volume are connected in parallel, carry out sub-load running or minimum running.When the heating low-temperature region, constant speed compressor and compressor with variable volume are connected in series, and vapor phase refrigerant is sprayed between above-mentioned constant speed compressor and compressor with variable volume.Thereby, have the maximized effect of heating capacity that makes according to outer temperature degree.
In addition, according to air-conditioning system of the present invention,, compare the cheap advantage of expense so have situation about constituting by compressor with variable volume than all compressors because compression unit is made of compressor with variable volume and constant speed compressor.
In addition, according to air-conditioning system of the present invention,,, has the cheap advantage of expense so can make compression unit carry out the series/parallel conversion by simple structure owing to comprise connection stream and series/parallel switching valve.
In addition, according to air-conditioning system of the present invention,, has the advantage that can change corresponding to outer temperature degree neatly owing to control according to the testing result of the outdoor temperature sensor of measuring outer temperature degree.
In addition, air-conditioning system according to the present invention has following advantage, that is: in low-temperature region, vapor phase refrigerant is sprayed to compression unit, improve heating capacity, and come compressor with variable volume is carried out conversion control, can implement best conversion control according to outer temperature degree.
Description of drawings
Fig. 1 is the circulation pie graph according to an embodiment of air-conditioning system of the present invention.
The circulation pie graph of the refrigerant flow direction when Fig. 2 is expression according to the standard warming operation of an embodiment of air-conditioning system of the present invention.
The circulation pie graph of the refrigerant flow direction when Fig. 3 is expression according to the low temperature heating running of an embodiment of air-conditioning system of the present invention.
The circulation pie graph of the refrigerant flow direction when Fig. 4 is expression according to the utmost point low temperature heating running of an embodiment of air-conditioning system of the present invention.
Fig. 5 is the control block diagram according to an embodiment of air-conditioning system of the present invention.
Fig. 6 is the curve map of comparison along with the heating capacity of outer temperature degree.
The specific embodiment
Below, with reference to accompanying drawing embodiments of the invention are elaborated.
Fig. 1 is the circulation pie graph according to an embodiment of air-conditioning system of the present invention, the circulation pie graph of the refrigerant flow direction when Fig. 2 is expression according to the standard warming operation of an embodiment of air-conditioning system of the present invention, the circulation pie graph of the refrigerant flow direction when Fig. 3 is expression according to the low temperature heating running of an embodiment of air-conditioning system of the present invention, the circulation pie graph of the refrigerant flow direction when Fig. 4 is expression according to the utmost point low temperature heating running of an embodiment of air-conditioning system of the present invention, Fig. 5 is the control block diagram according to an embodiment of air-conditioning system of the present invention, and Fig. 6 is comparison according to the curve map along with the heating capacity of outer temperature degree of an embodiment of air-conditioning system of the present invention.
With reference to Fig. 1, air-conditioning system according to the present invention comprises: the compression unit 10 that comprises the compressed refrigerant of constant speed compressor 2 and compressor with variable volume 6; Be used as the outdoor heat converter 20 of evaporimeter when being used as condenser and warming operation during cooling operation; Be used as the indoor heat converter 30 of condenser when being used as evaporimeter and warming operation during cooling operation; The expansion mechanism 40,50 that is arranged between above-mentioned outdoor heat converter 20 and the indoor heat converter 30 and cold-producing medium is expanded; To when refrigeration, guide by above-mentioned compression unit 10 refrigerant compressed to above-mentioned outdoor heat converter 20, and the refrigeration/heating flow channel switching valve cross valve 60 that when heating, guides to above-mentioned indoor heat converter 30; The cold-producing medium that flows into is separated into vapor phase refrigerant and liquid phase refrigerant, and liquid phase refrigerant is sent to evaporimeter, vapor phase refrigerant is sent to the phase-splitter 70 of above-mentioned compression unit 10.
Above-mentioned compressor with variable volume 6 is made of the frequency-changeable compressor that compression volume is changed.
In addition, according to the air-conditioning system of present embodiment, also comprise series/parallel converting unit 80, it makes above-mentioned constant speed compressor 2 be connected with compressor with variable volume 6 serial or parallel connections.
Above-mentioned series/parallel converting unit 80 comprises: the suction that the suction passage 81 of above-mentioned constant speed compressor 2 and the suction passage 82 of above-mentioned compressor with variable volume 6 are connected in parallel stream 83 in parallel; The discharge that the discharge stream 84 of above-mentioned constant speed compressor 2 and the discharge stream 85 of above-mentioned compressor with variable volume 6 are connected in parallel stream 86 in parallel; In above-mentioned constant speed compressor 2 and the compressor with variable volume 6 any one discharged the stream 87 that is connected in series that stream 84 is connected with another suction passage 82.
The above-mentioned stream 87 that is connected in series, when above-mentioned constant speed compressor 2 and compressor with variable volume 6 are connected in series, the discharge stream 84 of above-mentioned constant speed compressor 2 and the suction passage 82 of above-mentioned compressor with variable volume 6 are connected, so that compressed by above-mentioned compressor with variable volume 6 by above-mentioned constant speed compressor 2 refrigerant compressed, on the contrary, the discharge stream 85 of above-mentioned compressor with variable volume 6 and the suction passage 81 of above-mentioned constant speed compressor 2 are connected, so that compressed by above-mentioned constant speed compressor 2 by above-mentioned compressor with variable volume 6 refrigerant compressed.Below, when being connected in series, described by the situation of above-mentioned compressor with variable volume 6 multi-stage compressions by above-mentioned constant speed compressor 2 refrigerant compressed for above-mentioned constant speed compressor 2 and compressor with variable volume 6.Thereby, can be more effectively increase, and above-mentioned constant speed compressor 2 driven, and above-mentioned compressor with variable volume 6 is carried out the situation of FREQUENCY CONTROL corresponding to the load of above-mentioned air-conditioning system.
Above-mentioned series/parallel converting unit 80 also comprises series/ parallel switching valve 88,89, and it optionally opens and closes above-mentioned suction stream 83 in parallel, above-mentioned discharge stream 86 in parallel and the above-mentioned stream 87 that is connected in series.
Above-mentioned series/ parallel switching valve 88,89 comprises: first switching valve that is arranged at the suction passage 82 of above-mentioned compressor with variable volume 6 is a compressor with variable volume inlet valve 88; Second switching valve that is arranged at the discharge stream 84 of above-mentioned constant speed compressor 2 is that constant speed compressor is inhaled dump valve 89.Above-mentioned compressor with variable volume inlet valve 88 can be arranged between the suction passage 82 of the branching portion of suction passage 81 branches of the suction passage 82 of above-mentioned compressor with variable volume 6 and above-mentioned constant speed compressor 2 and above-mentioned compressor with variable volume and the connecting portion 91 that the above-mentioned stream 87 that is connected in series connects.
Air-conditioning system according to present embodiment also comprises vapor phase refrigerant supply stream 92, when this stream 92 is connected in series at above-mentioned compression unit 10, be connected in above-mentioned phase-splitter 70 and the above-mentioned stream 87 that is connected in series, so that will supply with by the stream of vapor phase refrigerant between above-mentioned constant speed compressor 2 and compressor with variable volume 6 that above-mentioned phase-splitter 70 separates.Supply with in above-mentioned vapor phase refrigerant and to be provided with the vapor phase refrigerant valve 94 that constitutes by LEV of adjusting the vapor phase refrigerant amount in the stream 92.
On the other hand, above-mentioned expansion mechanism 40,50 comprises: be arranged at the refrigerant piping between above-mentioned indoor heat converter 30 and the above-mentioned phase-splitter 70, and first expansion valve 40 that constitutes by LEV; Be arranged at the refrigerant piping between above-mentioned phase-splitter 70 and the above-mentioned outdoor heat converter 20, and second expansion valve 50 that constitutes by LEV.
According to the air-conditioning system of present embodiment along with the external load that applies by the outside decide the series/parallel of above-mentioned compression unit 10 whether change and gas injection whether.At this, the said external load can adopt external temperature.
That is, as shown in Figure 5, above-mentioned air-conditioning system also comprises: the outdoor temperature sensor 96 that detects outer temperature degree; Control the control part 100 of above-mentioned constant speed compressor 2, compressor with variable volume 6, series/ parallel switching valve 88,89 and vapor phase refrigerant valve 94 according to the testing result of above-mentioned outdoor temperature sensor 96.
Above-mentioned control part 100 when the external load that is applied by the outside is equivalent to predefined first assumed load, as shown in Figure 2, is connected above-mentioned series/ parallel switching valve 88,89, and above-mentioned vapor phase refrigerant valve 94 is disconnected.At this, be defined in above-mentioned first assumed load and be outer temperature degree and be first design temperature promptly the low condition of load more than 5 ℃ describe.
On the other hand, above-mentioned control part 100 when the load that is applied by the outside is equivalent to predefined second assumed load, as shown in Figure 3, disconnects above-mentioned series/ parallel switching valve 88,89, and above-mentioned vapor phase refrigerant valve 94 is connected.In addition, for above-mentioned compressor with variable volume 6, carry out FREQUENCY CONTROL according to outer temperature degree.At this, above-mentioned second assumed load by outer temperature degree be below 0 ℃ comparing with above-mentioned first assumed load load big condition constitute.
In addition, above-mentioned control part 100 when external load is equivalent to the 3rd assumed load, as shown in Figure 4, disconnects above-mentioned series/ parallel switching valve 88,89, and above-mentioned vapor phase refrigerant valve 94 is disconnected.At this, above-mentioned the 3rd assumed load is made of for the condition below-20 ℃ outer temperature degree.
Fig. 6 is the curve map of comparison along with the heating capacity of outer temperature degree.
Among Fig. 6, Inv.MPS is that expression is when above-mentioned constant speed compressor 2 and compressor with variable volume 6 are connected in parallel, along with the curve map of the heating capacity of outer temperature degree.Among Fig. 6, GI is that expression is when be connected in series first compression set and second compression set in a housing, and when under the certain state of the volume ratio of compression set vapor phase refrigerant being sprayed between above-mentioned first compression set and second compression set, along with the curve map of the heating capacity of outer temperature degree.And among Fig. 6, to be expression be connected in series when constant speed compressor 2 and compressor with variable volume 6 GIII (GI+Inv.MPS), and when above-mentioned compressor with variable volume 6 carried out FREQUENCY CONTROL according to outer temperature degree, along with the curve map of the heating capacity of outer temperature degree.
As shown in Figure 6, if the system's heating capacity relatively under three kinds of situations, then as can be known outside the temperature degree be more than 5 ℃ the time, the heating capacity under three kinds of situations is similar.Thereby the temperature degree is more than 5 ℃ the time outside, and is less because of loading, thus with the situation of Inv.MPS in the same manner, if above-mentioned constant speed compressor 2 and compressor with variable volume 6 are connected in parallel, then can make power consumption minimized and COP is increased.
On the other hand, the temperature degree is below 0 ℃ the time outside as can be known, and the situation of above-mentioned GI II is compared with the situation of above-mentioned Inv.MPS, and heating capacity is bigger.That is, the temperature degree is below 0 ℃ the time outside, and the raising along with the effect of gas injection can correspondingly improve heating capacity.Thereby, be preferably above-mentioned constant speed compressor 2 and compressor with variable volume 6 be connected in series, and carry out the gas injection action of spraying vapor phase refrigerant.
Action according to air-conditioning system of the present invention is as follows.
At first, if outer temperature degree is the condition more than 5 ℃, then because less, so above-mentioned control part 100 is selected the action that power consumption are minimum and can increase COP to the user's of output temperature (being heating temperature) requirement (promptly discontented).
That is, as shown in Figure 2, above-mentioned control part 100 disconnects above-mentioned series/ parallel switching valve 88,89, drives and above-mentioned constant speed compressor 2 and compressor with variable volume 6 are connected in parallel.In addition, above-mentioned control part 100 disconnects above-mentioned vapor phase refrigerant valve 84, and does not spray vapor phase refrigerant to above-mentioned compression unit 10.
Thereby the vapor phase refrigerant in the above-mentioned phase-splitter 70 can not supply in the above-mentioned compressor with variable volume 6.Above-mentioned phase-splitter 70 is carried out receiving function.After the liquid phase refrigerant that comes out from above-mentioned phase-splitter 70 expands above-mentioned second expansion gear 50, in above-mentioned evaporimeter 20, evaporate, and be inhaled into above-mentioned compression unit 10 via above-mentioned cross valve 60.
Owing to be the state that above-mentioned constant speed compressor 2 and compressor with variable volume 6 are connected in parallel, be drawn into respectively in above-mentioned constant speed compressor 2 and the compressor with variable volume 6 so be inhaled into the cold-producing medium of above-mentioned compression unit 10, be compressed respectively then and discharge.
Above-mentioned compression unit 10 is under the state that above-mentioned constant speed compressor 2 and compressor with variable volume 6 are connected in parallel, move with sub-load running or minimum running corresponding to external load, and to COP, than the situation increase of in a compressor, be connected in series first compression set and second compression set.
The refrigerant mixed of discharging respectively from above-mentioned constant speed compressor 2 and compressor with variable volume 6 and via behind the above-mentioned cross valve 60 flow in the above-mentioned condenser 30.After expanding in above-mentioned first expansion gear 40 by above-mentioned condenser 30 condensed refrigerant, flow in the above-mentioned phase-splitter 70, and proceed as above-mentioned circulation.
On the other hand, when outer temperature degree is below 0 ℃ the time, as shown in Figure 3, above-mentioned control part 100 disconnects above-mentioned series/ parallel switching valve 88,89, and above-mentioned vapor phase refrigerant valve 94 is connected.Be that above-mentioned control part 100 is connected in series above-mentioned constant speed compressor 2 and compressor with variable volume 6 to drive, and the vapor phase refrigerant of coming out from above-mentioned phase-splitter 70 is sprayed between above-mentioned constant speed compressor 2 and compressor with variable volume 6.
When above-mentioned series/ parallel switching valve 88,89 disconnects, discharge stream 84 sealings of above-mentioned constant speed compressor 2, and seal between above-mentioned branching portion 90 and the connecting portion 91 in the suction passage 82 of above-mentioned compressor with variable volume 6.Thereby the cold-producing medium that is drawn into above-mentioned compression unit 10 is suction passage 82, above-mentioned compressor with variable volume 6, the discharge stream 85 of above-mentioned compressor with variable volume 6 of the suction passage 81 by above-mentioned constant speed compressor 2, above-mentioned constant speed compressor 2, the above-mentioned stream 87 that is connected in series, above-mentioned compressor with variable volume 6 successively.
That is, after the liquid phase refrigerant that is separated by above-mentioned phase-splitter 70 expands in above-mentioned second expansion gear 50, in above-mentioned evaporimeter 20, evaporate, and be drawn into above-mentioned constant speed compressor 2 via above-mentioned cross valve 60.Flow in the above-mentioned stream 87 that is connected in series by above-mentioned constant speed compressor 2 refrigerant compressed.At this moment, the vapor phase refrigerant of being separated by above-mentioned phase-splitter 70 flow in the above-mentioned stream 87 that is connected in series by above-mentioned vapor phase refrigerant supply stream 92.
Thereby the cold-producing medium that mixes in the above-mentioned stream 87 that is connected in series is inhaled in the above-mentioned compressor with variable volume 6, and after being compressed, and the discharge stream 85 by above-mentioned compressor with variable volume 6 flows to above-mentioned cross valve 60.Then, in above-mentioned condenser 30, after the condensation, in above-mentioned first expansion gear 40, expand, flow into then in the above-mentioned phase-splitter 70, and proceed as above-mentioned circulation.
As above-mentioned series operation and the control of gas phase injection of refrigerant the time, above-mentioned control part 100 carries out conversion control along with outer temperature degree to above-mentioned compressor with variable volume 6.That is, outer temperature degree is low more, and the incoming frequency of above-mentioned compressor with variable volume 6 is increased, and outer temperature degree is high more, and the incoming frequency of above-mentioned compressor with variable volume 6 is reduced.Thereby, implement best conversion control according to outer temperature degree.In addition, utilize the gas injection effect of spraying vapor phase refrigerant, make the heating capacity maximization.
On the other hand, when outer temperature degree is below-20 ℃ the time, be difficult to expectation gas injection effect.Thereby as shown in Figure 4, above-mentioned control part 100 disconnects above-mentioned series/ parallel switching valve 88,89, and above-mentioned vapor phase refrigerant valve 94 is disconnected.That is, make above-mentioned constant speed compressor 2 and compressor with variable volume 6 series operations, do not supply with vapor phase refrigerant to above-mentioned compression unit 10.
During as above-mentioned control, above-mentioned phase-splitter 70 plays receiving function, after the liquid phase refrigerant in the above-mentioned phase-splitter 70 expands in above-mentioned second expansion gear 50, and evaporation in above-mentioned evaporimeter 20.Then, via above-mentioned cross valve 60, the suction passage 81 by above-mentioned constant speed compressor 2 is drawn in the above-mentioned constant speed compressor 2.Flow in the above-mentioned compressor with variable volume 6 by the above-mentioned stream 87 that is connected in series by above-mentioned constant speed compressor 2 refrigerant compressed., be condensed in above-mentioned condenser 30 via above-mentioned cross valve 60 by above-mentioned compressor with variable volume 6 refrigerant compressed.Then, after in above-mentioned first expansion gear 40, expanding, flow into above-mentioned phase-splitter 70, and proceed as above-mentioned circulation.
In above-mentioned the present invention, whether the supply of controlling vapor phase refrigerant according to outer temperature degree and can make above-mentioned compressor 2 and compressor with variable volume 60 be connected in series or be connected in parallel.Thereby, improve heating capacity, can also increase COP.
In air-conditioning system of the present invention, when the standard heating area, constant speed compressor and capacity compressor with variable are connected in parallel, carry out sub-load running or minimum running. When the heating low-temperature region, constant speed compressor and capacity compressor with variable are connected in series, and the gas phase cold-producing medium is sprayed between above-mentioned constant speed compressor and capacity compressor with variable. Thereby, have and make according to the maximized effect of the heating capacity of outer temperature degree.
Claims (7)
1. an air-conditioning system is characterized in that, comprising:
The phase-splitter that separates vapor phase refrigerant and liquid phase refrigerant;
The evaporimeter that will evaporate by the liquid phase refrigerant that above-mentioned phase-splitter separates;
The cold-producing medium of above-mentioned evaporimeter is passed through in compression, and comprises the compression unit of constant speed compressor and compressor with variable volume;
The series/parallel converting unit, it has: the suction that the suction passage of above-mentioned constant speed compressor and the suction passage of above-mentioned compressor with variable volume are connected in parallel stream in parallel; The discharge that the discharge stream of above-mentioned constant speed compressor and the discharge stream of above-mentioned compressor with variable volume are connected in parallel stream in parallel; The stream that is connected in series that above-mentioned constant speed compressor and compressor with variable volume are connected in series; With the series/parallel switching valve that control is carried out in the switching of above-mentioned suction stream in parallel, above-mentioned discharge stream in parallel and the above-mentioned stream that is connected in series, this series/parallel converting unit is arranged to and above-mentioned constant speed compressor and compressor with variable volume can be connected in series or be connected in parallel thus;
To supply with stream from the vapor phase refrigerant that the vapor phase refrigerant that above-mentioned phase-splitter is discharged is supplied with between above-mentioned constant speed compressor and compressor with variable volume;
Be arranged at the vapor phase refrigerant valve on the above-mentioned vapor phase refrigerant supply stream;
Control part according to load, is controlled above-mentioned constant speed compressor and compressor with variable volume, series/parallel switching valve and vapor phase refrigerant valve,
In above-mentioned air-conditioning system, above-mentioned series/parallel switching valve comprises:
Be arranged at the compressor with variable volume inlet valve on the suction passage of above-mentioned compressor with variable volume and be arranged at constant speed compressor dump valve on the discharge stream of above-mentioned constant speed compressor,
Above-mentioned control part carries out following control, that is: when the external load that is applied by the outside is equivalent to first assumed load, above-mentioned series/parallel switching valve is connected, and above-mentioned vapor phase refrigerant valve is disconnected; When said external load is equivalent to than big second assumed load of first assumed load, above-mentioned series/parallel switching valve is disconnected, and above-mentioned vapor phase refrigerant valve is connected.
2. air-conditioning system according to claim 1 is characterized in that, the above-mentioned stream that is connected in series is connected with another suction passage the discharge stream of any one in above-mentioned constant speed compressor and the above-mentioned compressor with variable volume.
3. air-conditioning system according to claim 2 is characterized in that, the above-mentioned stream that is connected in series is connected the discharge stream of above-mentioned constant speed compressor and the suction passage of above-mentioned compressor with variable volume.
4. air-conditioning system according to claim 1, it is characterized in that above-mentioned compressor with variable volume inlet valve is arranged between the suction passage of the branching portion of suction passage branch of the suction passage of above-mentioned compressor with variable volume and above-mentioned constant speed compressor and above-mentioned compressor with variable volume and the connecting portion that the above-mentioned stream that is connected in series connects.
5. air-conditioning system according to claim 1 is characterized in that, above-mentioned first assumed load is that outer temperature degree is the above load of predefined first design temperature, and above-mentioned second assumed load is the load of outer temperature degree for not enough above-mentioned first design temperature.
6. air-conditioning system according to claim 5, it is characterized in that, when above-mentioned control part is equivalent to than big the 3rd assumed load of above-mentioned second assumed load when said external load, above-mentioned series/parallel switching valve is disconnected, and above-mentioned vapor phase refrigerant valve is disconnected.
7. air-conditioning system according to claim 6 is characterized in that, above-mentioned the 3rd assumed load is that outer temperature degree is the following load of second design temperature that is lower than above-mentioned first design temperature.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020070073554A KR100865093B1 (en) | 2007-07-23 | 2007-07-23 | Air conditioning system |
| KR1020070073554 | 2007-07-23 | ||
| KR10-2007-0073554 | 2007-07-23 |
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| Publication Number | Publication Date |
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| CN101354198A CN101354198A (en) | 2009-01-28 |
| CN101354198B true CN101354198B (en) | 2011-03-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2008100947843A Expired - Fee Related CN101354198B (en) | 2007-07-23 | 2008-05-16 | Air conditioning system |
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| KR (1) | KR100865093B1 (en) |
| CN (1) | CN101354198B (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| SE533859C2 (en) * | 2009-06-30 | 2011-02-08 | Alfa Laval Corp Ab | Method for operating a system of heat exchangers for subcritical and transcritical states, as well as a system of heat exchangers |
| JP5502459B2 (en) * | 2009-12-25 | 2014-05-28 | 三洋電機株式会社 | Refrigeration equipment |
| DE102010026648B4 (en) * | 2010-07-09 | 2015-12-31 | Gea Grasso Gmbh | Refrigeration system for cooling a container |
| KR101873595B1 (en) * | 2012-01-10 | 2018-07-02 | 엘지전자 주식회사 | A cascade heat pump and a driving method for the same |
| KR102122499B1 (en) * | 2013-07-02 | 2020-06-12 | 엘지전자 주식회사 | A cooling system and a control method the same |
| CN104748440B (en) * | 2015-03-31 | 2017-06-27 | 广东美的制冷设备有限公司 | The control method of air-conditioning system and air-conditioning system |
| BR112018008767B1 (en) | 2015-11-05 | 2023-03-21 | Danfoss A/S | STEAM COMPRESSION SYSTEM AND METHOD FOR OPERATING A COMPRESSOR UNIT AND SWITCHING THE COMPRESSION CAPACITY |
| KR102439236B1 (en) * | 2017-06-30 | 2022-09-01 | 엘지전자 주식회사 | An outdoor unit of an air conditioner |
| CN109114778B (en) * | 2018-08-20 | 2020-10-09 | 广东美的暖通设备有限公司 | Multi-connected air conditioning system, control method and device thereof and readable storage medium |
| KR20200061017A (en) | 2018-11-23 | 2020-06-02 | 엘지전자 주식회사 | Air conditioner |
| WO2020164215A1 (en) * | 2019-02-12 | 2020-08-20 | 珠海格力电器股份有限公司 | Refrigerant circulation system and air conditioner |
| KR20220040220A (en) * | 2020-09-23 | 2022-03-30 | 엘지전자 주식회사 | Multi-air conditioner for heating, cooling and air conditioning operations |
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| JP3164626B2 (en) * | 1992-01-27 | 2001-05-08 | 松下電器産業株式会社 | Two-stage compression refrigeration cycle device |
| JPH09145189A (en) * | 1995-11-27 | 1997-06-06 | Sanyo Electric Co Ltd | Refrigerating cycle and air conditioner provided with the refrigerating cycle |
| JP4018908B2 (en) | 2002-01-10 | 2007-12-05 | 株式会社日立製作所 | Refrigeration air conditioner |
| KR100857794B1 (en) * | 2006-01-06 | 2008-09-09 | 엘지전자 주식회사 | Air-conditioning system and Controlling Method for the same |
| KR100710311B1 (en) | 2006-02-15 | 2007-04-23 | 엘지전자 주식회사 | Air-conditioning system and controlling method for the same |
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| CN101354198A (en) | 2009-01-28 |
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