CN103604258A - Liquid-discharged gas-liquid separator - Google Patents
Liquid-discharged gas-liquid separator Download PDFInfo
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- CN103604258A CN103604258A CN201310559632.7A CN201310559632A CN103604258A CN 103604258 A CN103604258 A CN 103604258A CN 201310559632 A CN201310559632 A CN 201310559632A CN 103604258 A CN103604258 A CN 103604258A
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Abstract
The invention discloses a liquid-discharged gas-liquid separator comprises an upper cylinder, a lower cylinder, a liquid separating tube, an upper partition and a lower partition. The top of the upper cylinder is provided with a gas exhausting port used for exhausting separated gas. The bottom of the lower cylinder is provided with a liquid discharging port used for discharging separated liquid. The bottom of the upper cylinder and the top of the lower cylinder are connected in a sealed manner. The liquid separating tube is connected to the lower cylinder, a first end of the liquid separating tube is a straight tube, and a second end is an elbow bent along the inner wall of the lower cylinder. The upper partition is horizontally arranged in the upper cylinder, and a plurality of small holes or filters are annularly arranged in the surface of the inner wall of the upper partition adjacent to the upper cylinder. The lower partition is horizontally arranged at the bottom of the upper cylinder, and the center fo the lower cylinder is provided with an opening or filter. The invention further provides an injection system using the liquid-discharged gas-liquid separator and a cooling system bypassing with the gas inlet of an evaporator. Compared with a conventional gas-liquid separator, the liquid-discharged gas-liquid separator has the advantages that separating efficiency is high, pressure drop is low, and gas-liquid mixture can be separated and respectively discharged.
Description
Technical field
The present invention relates to the gas-liquid separator of refrigeration air-conditioner and art of heat pumps, relate in particular to a kind of discharge opeing type gas-liquid separator.
Background technology
Gas-liquid separator is a kind of device for gas-liquid separation, and its function is: be arranged on the gateway of gas compressor for gas-liquid separation, gas phase demist after fractionation tower top cooler, the gas phase demist on various gas scrubbing towers, absorption tower etc.The method of gas-liquid separation has a lot, such as gravitational settling, centrifugal force separate, baffling are separated, filler is separated etc.The most frequently used in industry is gravity settling separation and two kinds of gas-liquid separating methods of centrifugal force separate.
Gravity settling separation method is different from the density of liquid according to gas, liquid when flowing together with gas, liquid can be subject to the effect of gravity, produce a downward speed, and gas still flows towards original direction, that is to say liquid and gas separative tendency in gravitational field, downward liquid is attached on wall and pools together by delivery pipe and discharge.The simplicity of design of gravity settling separation method, equipment making is simple, and resistance is little, but the separative efficiency of this method is low, and equipment volume is huge, takes up room many.
Centrifugal force separate method is different from the density of liquid according to gas, and liquid and gas are mixed while flowing, and the centrifugal force that liquid is subject to is greater than gas, liquid has the tendency of centrifugation, liquid is attached on separated wall, then collects downwards by the effect of gravity, by delivery pipe, discharges.The separative efficiency of centrifugal force separate method is wanted the height of force of gravity sedimentation method for separating, and the device of volume ratio gravity sedimentation method for separating reduces a lot, and centrifugation structure can be used in pressure vessel, working stability.But separation meets narrow range, surpass after gas-liquid mixture regulation flow velocity, separative efficiency will sharply decline, and resistance ratios gravity settling separation method is large.
Therefore, in order to overcome the deficiency of existing gas-liquid separator, dwindle the volume of gas-liquid separator, improve separative efficiency, those skilled in the art is devoted to develop a kind of novel discharge opeing type gas-liquid separator.
Summary of the invention
The shortcomings such as because the above-mentioned defect of prior art, technical problem to be solved by this invention is to provide a kind of discharge opeing type gas-liquid separator, bigger than normal to overcome traditional gas-liquid separator volume, and the low and separation principle of separative efficiency is single.Be particularly useful for the separation of the gas-liquid mixture that mass dryness fraction is lower.
For achieving the above object, the invention provides a kind of discharge opeing type gas-liquid separator, it is characterized in that, comprise upper shell, lower shell, separating tube, upper strata dividing plate and lower floor's dividing plate;
The top of described upper shell is provided with an exhaust outlet, and described exhaust outlet is used for the gas of discharging to go out through described gas-liquid separator separates, and the bottom of described upper shell is opening;
The top of described lower shell is opening, and the bottom of described lower shell is provided with a bottom leakage fluid dram, and described leakage fluid dram is for discharging the liquid that described gas-liquid separator separates goes out;
The top of described lower shell is connected with the sealed bottom of described upper shell;
Described separating tube accesses in described lower shell at nearly described lower floor's dividing plate place, for inputting gas-liquid mixture in described lower shell; The first end of described separating tube is straight-run of pipe, the second end of described separating tube be one section along the bend pipe of described lower shell inwall bending;
Described upper strata dividing plate is horizontally set in described upper shell, and dividing plate annular on the surface of nearly described upper shell inwall in described upper strata is provided with some apertures or filter screen
Described lower floor dividing plate is horizontally set on the bottom of described upper shell, the center of described lower floor dividing plate or be provided with opening or filter screen by paracentral position.
Further, the top of described lower shell and the bottom of described upper shell weld together, and to guarantee that gas-liquid separator of the present invention is when the High Rotation Speed, the shell portion of upper shell and lower shell there will not be leakage.
In a preferred embodiment of the present invention, the straight tube of described separating tube is to access in described lower shell along the tangential direction of described lower shell inwall or approximate tangential direction.Because the density of gas and liquid is different with viscosity, there is gas-liquid separation for the first time in the gas-liquid mixture of inputting by separating tube under the effect of centrifugal force, and liquid is thrown toward on the inwall away from lower shell center one side separating liquid pipe.
Further, the bend pipe of described separating tube is crooked along the inwall of described lower shell, described bend pipe in same level, or with the tangent hand of helix of described lower shell inwall on.
In a preferred embodiment of the present invention, described upper strata dividing plate is a flat board.
In a preferred embodiment of the present invention, described upper strata dividing plate is one to be had to the taper of top bump or the dividing plate of arc, or one has to the taper of bottom protrusion or the dividing plate of arc.Because upper strata dividing plate is to have to top or the projection of bottom, such when liquid adsorption is during in upper strata baffle surface, liquid is easier to downward outflow under Action of Gravity Field.
In a preferred embodiment of the present invention, described lower floor dividing plate is a flat board.
In a preferred embodiment of the present invention, described lower floor dividing plate is one to be had to the taper of top bump or the dividing plate of arc, or one has to the taper of bottom protrusion or the dividing plate of arc.While inhaling attaching liq like this on lower floor's dividing plate, because lower floor's dividing plate has to top or to the projection of bottom, liquid, under the effect of gravity, is easy to downward outflow more.Discharge opeing type gas-liquid separator of the present invention, employing is with the design of separating tube, upper strata dividing plate and lower floor's dividing plate of bend pipe, five gas-liquid separations have been carried out: when gas-liquid mixture enters at a high speed separating tube, because the density of gas and liquid is different with viscosity, gas-liquid mixture carries out gas-liquid separation for the first time under the effect of centrifugal force, and the liquid after separation is thrown toward the inwall away from the separating tube at lower shell center; The gas-liquid mixture flowing out from separating tube, High Rotation Speed in the cylindrical space that lower floor's dividing plate and lower shell surround, under the effect of centrifugal force, there is gas-liquid separation for the second time in gas-liquid mixture, liquid is thrown to lower shell internal face, in the outlet of the dirty downward cylinder body bottom of Action of Gravity Field; Gas-liquid mixture after gas-liquid separation passes lower clapboard middle perforate or filter screen in the center of lower shell for the second time, flow to the center of upper spacer, in the space surrounding at upper lower clapboard after colliding with upper spacer, slow down, because the density of gas and liquid is different with viscosity, the liquid of carrying secretly is attracted on the dividing plate of upper strata, and gas-liquid separation for the third time occurs; In the space that upper strata dividing plate and lower floor's dividing plate surround, because the gas-liquid mixture flow velocity after gas-liquid separation is for the third time lower, liquid is further sedimentation under Action of Gravity Field, is adsorbed on internal face, upper strata dividing plate and lower floor's dividing plate of upper shell, and the 4th gas-liquid separation occurs; Gas-liquid mixture after the 4th separation is during through the aperture on the dividing plate of upper strata or filter screen, and the liquid of carrying secretly is caught again, and the 5th gas-liquid separation occurs, and the gas after last separation is discharged by the exhaust outlet at upper shell top.
Further, the present invention also provides a kind of ejector system that uses discharge opeing type gas-liquid separator, it is characterized in that, comprises compressor, condenser, gas-liquid separator, injector, choke valve and evaporimeter;
The delivery outlet of described compressor is connected with the input port of described condenser, the delivery outlet of described condenser is connected with the input port of described injector, the delivery outlet of described injector is connected with the separating tube of described gas-liquid separator, the exhaust outlet of described gas-liquid separator is connected with the air entry of described compressor, the leakage fluid dram of described gas-liquid separator is connected with the input port of described evaporimeter by described choke valve, and the delivery outlet of described evaporimeter is connected with the induction chamber entrance of described injector.Use the spraying system of discharge opeing type gas-liquid separator of the present invention, significantly promoted the pressure of inspiration(Pi) of system, reduced the energy consumption of compressor, effectively improved the phenomenon of evaporator inlet punishment liquid inequality simultaneously, improved the ability of evaporimeter.
Further, the present invention also provides a kind of evaporator inlet gas bypass refrigeration system of using discharge opeing type gas-liquid separator, it is characterized in that, comprises compressor, condenser, expansion valve, described gas-liquid separator, evaporimeter and control valve;
The delivery outlet of described compressor is connected with the input port of described condenser, the delivery outlet of described condenser is connected by described expansion valve with the separating tube of described gas-liquid separator, the leakage fluid dram of described gas-liquid separator is connected with the input port of described evaporimeter, and the delivery outlet of described evaporimeter is connected to the air entry of described compressor together with the exhaust outlet of described gas-liquid separator.The evaporator inlet gas bypass refrigeration system of use discharge opeing type gas-liquid separator has effectively been improved the phenomenon of evaporimeter separatory inequality, takes full advantage of the heat exchange area of evaporimeter, has improved the ability of evaporimeter.Meanwhile, because the gas of separating is directly got back to compressor, to the inoperative gaseous refrigerant that the freezes evaporimeter of not flowing through, effectively reduce like this drag losses of evaporimeter.
Below with reference to accompanying drawing, the technique effect of design of the present invention, concrete structure and generation is described further, to understand fully object of the present invention, feature and effect.
Accompanying drawing explanation
Fig. 1 is the front view of a preferred embodiment of a kind of discharge opeing type gas-liquid separator of the present invention;
Fig. 2 is longitudinal view of a preferred embodiment of a kind of discharge opeing type gas-liquid separator of the present invention;
Fig. 3 is the schematic diagram of the upper shell of a kind of discharge opeing type gas-liquid separator of the present invention;
Fig. 4 is the schematic diagram of the lower shell of a kind of discharge opeing type gas-liquid separator of the present invention;
Fig. 5 is the schematic diagram of the separating tube of a kind of discharge opeing type gas-liquid separator of the present invention;
Fig. 6 is the schematic diagram of the upper strata dividing plate of a kind of discharge opeing type gas-liquid separator of the present invention;
Fig. 7 is the schematic diagram of lower floor's dividing plate of a kind of discharge opeing type gas-liquid separator of the present invention;
Fig. 8 is a kind of spraying system schematic diagram that uses discharge opeing type gas-liquid separator of the present invention;
Fig. 9 is the refrigeration system schematic diagram that uses the front gas bypass of a kind of evaporimeter of discharge opeing type gas-liquid separator of the present invention.
The specific embodiment
Below in conjunction with accompanying drawing, embodiments of the invention are elaborated, the present embodiment is implemented under with technical solution of the present invention prerequisite, provided detailed embodiment and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
As shown in Figure 1, longitudinal sectional view as shown in Figure 2 for the front view of discharge opeing type gas-liquid separator of the present invention.Discharge opeing type gas-liquid separator of the present invention comprises: upper shell 1, lower shell 2, separating tube 3, upper strata dividing plate 4 and lower floor's dividing plate 5.The top of upper shell 1 is provided with exhaust outlet 11, and bottom is opening, as shown in Figure 3.Exhaust outlet 11 is for the isolated gas of drainage gas-liquid separator.The bottom of lower shell 2 is provided with leakage fluid dram 21, opening during top, as shown in Figure 4.Leakage fluid dram 21 is for the isolated liquid of drainage gas-liquid separator.As illustrated in fig. 1 and 2, the top seal of lower shell 2 is socketed on the bottom of upper shell 1.In a preferred embodiment of the present invention, lower shell 2 is welded on upper shell 1.Separating tube 3 is for inputting gas-liquid mixture in the interior ，Qi Jin of lower shell 2 lower floor dividing plate 5 place's access lower shells 2.The first end 31(separating tube 3 of separating tube 3 one end outside lower shell 2) be straight-run of pipe, second end 32(separating tube 3 one end in lower shell 2 of separating tube 3) be one section along the bend pipe of lower shell 2 inwall bendings, specifically as shown in Figure 2 and Figure 5.In a preferred embodiment of the present invention, the bend pipe of separating tube 3 is along the inwall bending of lower shell, and its flexibility is between 45 ° to 135 °, and bend pipe can be in same level, also can with the tangent hand of helix of lower shell inwall on.As shown in Figure 2 and Figure 6, upper strata dividing plate 4 is horizontally set in upper shell 1, and on nearly upper shell 1 inwall of upper strata dividing plate 4, annular is provided with some apertures or filter screen.Upper strata dividing plate 4 can be a flat board, can be also one and have to the taper of top bump or the dividing plate of arc, or one has to the taper of bottom protrusion or the dividing plate of arc.Upper strata dividing plate 4 shown in Fig. 2 and Fig. 6 is the dividing plates that have to the arc of top bump.Because the circle ring area of upper strata dividing plate 4 nearly upper shell 1 inwalls is provided with some apertures or filter screen, can effectively catch the liquid of carrying secretly in gas.Gas upwards flows out by aperture or filter screen, finally by exhaust outlet 11, discharges; And liquid under Action of Gravity Field to gas-liquid separator flows, finally by leakage fluid dram 21, discharge.Lower floor's dividing plate 5 is horizontally set on the bottom of upper shell 1, and the center of lower floor's dividing plate 5 has on the border circular areas of a border circular areas ，Gai lower floor dividing plate 5 and is provided with opening or filter screen, as shown in Figure 7.Lower floor's dividing plate 5 can be a flat board, can be also one and have to the taper of top bump or the dividing plate of arc, or one has to the taper of bottom protrusion or the dividing plate of arc.
Gas-liquid separator of the present invention is mainly to utilize liquids and gases density different with viscosity, then makes full use of traditional gravity settling separation method and to gas-liquid mixture, carry out separated with centrifugal force separate method.Gas-liquid mixture is input in lower shell 2 at a high speed by separating tube 3, and the gas-liquid mixture entering in lower shell 2 carries out altogether five gas-liquid separations in gas-liquid separator of the present invention:
Gas-liquid separation for the first time: due to the second end of separating tube 3 be one with flexibility bend pipe, because the density of its gas and liquid is different with viscosity, there is gas-liquid separation for the first time in the gas-liquid mixture flowing into by separating tube 3, isolated liquid is thrown toward on the inwall away from the separating tube 3 of lower shell 2 center one sides under the effect of centrifugal force.
Gas-liquid separation for the second time: gas-liquid mixture is to input at a high speed the cylindrical space that lower shell 2 and lower floor's dividing plate 5 surround, because the second end of separating tube 3 is bend pipes, can there is High Rotation Speed in the gas-liquid mixture after gas-liquid separation for the first time.Under the effect of centrifugal force, there is further separation, i.e. gas-liquid separation for the second time in the gas-liquid mixture after gas-liquid separation for the first time.Liquid after separation is thrown toward on the inner tubal wall of lower shell, and the liquid being attached on inner tubal wall flows to the leakage fluid dram of lower shell 2 bottoms downwards under the effect of gravity.
Gas-liquid separation for the third time: the center that opening or the filter screen of the gas-liquid mixture after gas-liquid separation for the second time by lower floor's dividing plate 5 centers upwards flows to upper strata dividing plate 4, with after upper strata dividing plate 4 collision at upper strata dividing plate 4, in the region that lower floor's dividing plate 5 and upper shell 1 surround, slow down, under the effect of inertia force and viscous force, there is gas-liquid separation for the third time, isolated liquid is adsorbed on the center of upper strata dividing plate 4 lower surfaces (upper strata dividing plate 4 is towards the one side of lower floor's dividing plate 5), the liquid of absorption flows to leakage fluid dram or lower floor's dividing plate 5 of lower shell 2 bottoms downwards under the effect of gravity.And, for the recovery of more convenient liquid, upper strata dividing plate 4 is made to one and have to the taper of top bump or the dividing plate of arc, or one has to the taper of bottom protrusion or the dividing plate of arc.
The 4th gas-liquid separation: the gas-liquid mixture after gas-liquid separation for the third time slows down in the region between upper strata dividing plate 4 and lower floor's dividing plate 5, because flow velocity is lower, under the effect of gravity, the 4th gas-liquid separation can occur, isolated liquid drops on the upper surface (being that lower floor's dividing plate 5 is towards the one side of upper strata dividing plate 4) of lower floor's dividing plate 5 in the effect of gravity.The liquid being adsorbed on lower floor's dividing plate 5 flows to the leakage fluid dram of lower shell 2 bottoms downwards under the effect of gravity.And, in order to facilitate the recovery ，Jiang lower floor dividing plate 5 of isolated liquid to make one, have to the taper of top bump or the dividing plate of arc, or one has to the taper of bottom protrusion or the dividing plate of arc.
The 5th gas-liquid separation: the gas-liquid mixture after the 4th gas-liquid separation is upward through aperture or the filter screen on upper strata dividing plate 4 surfaces carried out the 5th gas-liquid separation in the process through aperture or filter screen.Aperture or filter screen aperture or filter screen can catch the liquid in gas-liquid mixture, and isolated liquid is attached on the aperture or filter screen of upper strata dividing plate 4.Be attached to leakage fluid dram or lower floor's dividing plate 5 that liquid on upper strata dividing plate 4 apertures or filter screen flows to lower shell 2 bottoms downwards under the effect of gravity.Similarly, in order to facilitate the recovery of liquid, upper strata dividing plate 4 is made to one and have to the taper of top bump or the dividing plate of arc, or one has to the taper of bottom protrusion or the dividing plate of arc.
Further, apply a kind of ejector system of gas-liquid separator of the present invention, specifically as shown in Figure 8, comprised compressor 81, condenser 82, gas-liquid separator 84, injector 83, choke valve 85 and evaporimeter 86.The delivery outlet of compressor 81 is connected with the input port of condenser 82, then the delivery outlet of condenser 82 is connected with injector 83 input ports, injector 83 delivery outlets are connected with gas-liquid separator 84 input ports, evaporimeter 86 input ports are connected with gas-liquid separator 84 liquid phase delivery outlets, evaporimeter 86 delivery outlets are connected with injector 83 induction chamber entrances, and gas-liquid separator 84 gaseous phase outlets are connected with compressor 81 air entries.
Applied the spraying system of gas-liquid separator, gas-liquid separator plays very crucial effect, separated in gas-liquid separator at needs from injector gas-liquid mixture out, this just requires gas-liquid separator to have less pressure drop and higher separative efficiency, stable, the operation efficiently of guarantee system.Need to be separated gas-liquid separator from injector gas-liquid mixture out, liquid enters evaporimeter, and gas is got back to compressor, has significantly promoted the pressure of inspiration(Pi) of spraying system.After gas-liquid separation, only have liquid refrigerant to enter evaporimeter, effectively improved the phenomenon of evaporimeter separatory inequality, be conducive to making full use of of evaporimeter heat exchange area, improve evaporator capacity.
Further, applied the refrigeration system of a kind of evaporator inlet gas bypass of gas-liquid separator of the present invention, specifically as shown in Figure 9.Comprise compressor 91, condenser 92, expansion valve 93, gas-liquid separator 94, evaporimeter 95 and control valve 96.The delivery outlet of compressor 91 is connected with the input port of condenser 92, the delivery outlet of condenser 92 is connected by expansion valve with the separating tube 3 of gas-liquid separator 94, the leakage fluid dram 21 of gas-liquid separator 94 is connected with the input port of evaporimeter 95, is connected to the air entry of compressor 91 together with the exhaust outlet 11 of the delivery outlet of evaporimeter 95 and gas-liquid separator 94.
Applied the refrigeration system of the evaporator inlet gas bypass of gas-liquid separator, need to be separated gas-liquid separator from expansion valve gas-liquid mixture out, liquid enters evaporimeter, and the gas of gas and evaporator outlet enters compressor after mixing.The bypass that this has realized gaseous refrigerant, allows the almost inoperative gaseous refrigerant that freezes is directly got back to compressor, has effectively avoided the drag losses of this part gas.After gas-liquid separation, only have liquid refrigerant to enter evaporimeter, improved the phenomenon of evaporimeter separatory inequality, be conducive to making full use of of evaporimeter heat exchange area, improve evaporator capacity.
More than describe preferred embodiment of the present invention in detail.The ordinary skill that should be appreciated that this area just can design according to the present invention be made many modifications and variations without creative work.Therefore, all technical staff in the art, all should be in the determined protection domain by claims under this invention's idea on the basis of existing technology by the available technical scheme of logical analysis, reasoning, or a limited experiment.
Claims (10)
1. a discharge opeing type gas-liquid separator, is characterized in that, comprises upper shell, lower shell, separating tube, upper strata dividing plate and lower floor's dividing plate; The top of described upper shell is provided with an exhaust outlet, and described exhaust outlet is used for the gas of discharging to go out through described gas-liquid separator separates, and the bottom of described upper shell is opening;
The top of described lower shell is opening, and the bottom of described lower shell is provided with a bottom leakage fluid dram, and described leakage fluid dram is for discharging the liquid that described gas-liquid separator separates goes out;
The top of described lower shell is connected with the sealed bottom of described upper shell;
Described separating tube accesses in described lower shell at nearly described lower floor's dividing plate place, for inputting gas-liquid mixture in described lower shell; The first end of described separating tube is straight-run of pipe, the second end of described separating tube be one section along the bend pipe of described lower shell inwall bending;
Described upper strata dividing plate is horizontally set in described upper shell, and in the nearly described upper shell inner wall surface of described upper strata dividing plate, annular is provided with some apertures or filter screen;
Described lower floor dividing plate is horizontally set on the bottom of described upper shell, the center of described lower floor dividing plate or be provided with opening or filter screen by paracentral position.
2. a kind of discharge opeing type gas-liquid separator as claimed in claim 1, wherein, the top of described lower shell and the bottom of described upper shell weld together.
3. a kind of discharge opeing type gas-liquid separator as claimed in claim 1, wherein, the straight tube of described separating tube is to access in described lower shell along the tangential direction of described lower shell inwall or approximate tangential direction.
4. a kind of discharge opeing type gas-liquid separator as claimed in claim 1, wherein, the bend pipe of described separating tube is that described bend pipe is in same level or on the tangent hand of helix of described lower shell inwall along the inwall bending of described lower shell.
5. a kind of discharge opeing type gas-liquid separator as claimed in claim 1, wherein, described upper strata dividing plate is a flat board.
6. a kind of discharge opeing type gas-liquid separator as claimed in claim 1, wherein, described upper strata dividing plate is one to be had to the taper of top bump or the dividing plate of arc, or one has to the taper of bottom protrusion or the dividing plate of arc.
7. a kind of discharge opeing type gas-liquid separator as claimed in claim 1, wherein, described lower floor dividing plate is a flat board.
8. a kind of discharge opeing type gas-liquid separator as claimed in claim 1, wherein, described lower floor dividing plate is one to be had to the taper of top bump or the dividing plate of arc, or one has to the taper of bottom protrusion or the dividing plate of arc.
9. use an ejector system for discharge opeing type gas-liquid separator as claimed in claim 1, it is characterized in that, comprise compressor, condenser, gas-liquid separator, injector, choke valve and evaporimeter; The delivery outlet of described compressor is connected with the input port of described condenser, the delivery outlet of described condenser is connected with the input port of described injector, the delivery outlet of described injector is connected with the separating tube of described gas-liquid separator, the exhaust outlet of described gas-liquid separator is connected with the air entry of described compressor, the leakage fluid dram of described gas-liquid separator is connected with the input port of described evaporimeter by described choke valve, and the delivery outlet of described evaporimeter is connected with the induction chamber entrance of described injector.
10. use an evaporator inlet gas bypass refrigeration system for discharge opeing type gas-liquid separator as claimed in claim 1, it is characterized in that, comprise compressor, condenser, expansion valve, described gas-liquid separator, evaporimeter and control valve;
The delivery outlet of described compressor is connected with the input port of described condenser, the delivery outlet of described condenser is connected by described expansion valve with the separating tube of described gas-liquid separator, the leakage fluid dram of described gas-liquid separator is connected with the input port of described evaporimeter, and the delivery outlet of described evaporimeter is connected to the air entry of described compressor together with the exhaust outlet of described gas-liquid separator.
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