CN104930743B - The cooling and warming circulatory system - Google Patents

The cooling and warming circulatory system Download PDF

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Publication number
CN104930743B
CN104930743B CN201510243082.7A CN201510243082A CN104930743B CN 104930743 B CN104930743 B CN 104930743B CN 201510243082 A CN201510243082 A CN 201510243082A CN 104930743 B CN104930743 B CN 104930743B
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China
Prior art keywords
cooling
chamber
inlet chamber
refrigerant
control valve
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CN201510243082.7A
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Chinese (zh)
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CN104930743A (en
Inventor
虞阳波
杨国用
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Guangdong Meizhi Compressor Co Ltd
Anhui Meizhi Precision Manufacturing Co Ltd
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Guangdong Meizhi Compressor Co Ltd
Anhui Meizhi Precision Manufacturing Co Ltd
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Priority to CN201510243082.7A priority Critical patent/CN104930743B/en
Publication of CN104930743A publication Critical patent/CN104930743A/en
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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B13/00Compression machines, plant or systems with reversible cycle
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B29/00Combined heating and refrigeration systems, e.g. operating alternately or simultaneously
    • F25B29/003Combined heating and refrigeration systems, e.g. operating alternately or simultaneously of the compression type system
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B31/00Compressor arrangements
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B41/00Fluid-circulation arrangements
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B41/00Fluid-circulation arrangements
    • F25B41/30Expansion means; Dispositions thereof

Abstract

The invention discloses a kind of cooling and warming circulatory system, including:Reservoir, compressor, condenser, evaporator, flash vessel, the first and second throttling arrangements, when the cooling and warming circulatory system is run under small load condition, air entry is passed through inlet chamber and middle outlet chamber conducting in the middle of high pressure refrigerant, and control device control into middle inlet chamber;When the stable operation under big load and ultralow temperature heating condition of the cooling and warming circulatory system, air entry is passed through inlet chamber and middle outlet chamber conducting in the middle of middle pressure refrigerant, and control device control into middle inlet chamber;When the cooling and warming circulatory system is run under other high load working conditions in addition to being heated except ultralow temperature, air entry is passed through inlet chamber and middle outlet chamber cut-off in the middle of low pressure refrigerant, and control device control into middle inlet chamber.According to the cooling and warming circulatory system of the present invention, it can effectively realize fast-refrigerating, heat.

Description

The cooling and warming circulatory system
Technical field
The present invention relates to heating-cooling equipment manufacturing technology field, more particularly, to a kind of cooling and warming circulatory system.
Background technology
Pointed out in correlation technique, due to the difference of external environment condition change, user's request etc., the burden requirement of air-conditioning system Difference, moreover, under conditions of bad environments, user typically requires that air-conditioning system can realize that fast-refrigerating is heated.Air-conditioning system The load difference of system is big, and the requirement and performance to air-conditioning system also have very big difference.
When air-conditioning system load is big, such as ultralow temperature is heated, because the specific volume of refrigerant is big, the compressor of air-conditioning system Air-breathing mass flow reduces, except causing compressor heating capacity to be greatly lowered, simultaneously as mass flow is reduced, oil return Difficulty, the heat that refrigerant is taken away is reduced, and the compression mechanism abrasion and motor reliability for being easily caused compressor decline, and system Efficiency is low, under such conditions, is compressed using twin-stage jet, can be effectively increased gas mass flow, improves system heating capacity And efficiency, and improve compression mechanism lubrication.
However, in operating mode refrigerating operatons such as centre refrigeration, pressure ratio is small, and single stage compress efficiency is improved, if also using double If level compression, because it there are two cylinders to work simultaneously, friction power loss increase can be caused faster than cold increase, be also possible to simultaneously Cause the situation of refrigerant overcompression, causing the efficiency of Two-stage Compression reduces.
In small load condition condition, easily there is refrigerating capacity surplus under such as middle cryogenic conditions, so that cause energy waste, Simultaneously in high load working condition condition, such as ultralow temperature is heated down, the not enough phenomenon of heating capacity easily occurs, and efficiency is very low.Moreover, When user requires that system can realize that fast-refrigerating is heated, it is impossible to quickly increase cold medium flux.
The content of the invention
It is contemplated that at least solving one of technical problem present in prior art.Therefore, one object of the present invention It is to propose a kind of cooling and warming circulatory system, can preferably meets actual requirement.
The cooling and warming circulatory system according to embodiments of the present invention, including:Reservoir, the reservoir have air inlet and Gas outlet;Compressor, the compressor includes housing and the compression mechanism being located in the housing, and the compression mechanism includes gas Cylinder component and be located at the cylinder assembly axial two ends base bearing and supplementary bearing, the cylinder assembly includes two gas Cylinder and the dividing plate being located between described two cylinders, each cylinder have a compression chamber, the compression chamber include suction muffler and It is formed with discharge chamber, the compression mechanism on middle inlet chamber and middle outlet chamber, the middle inlet chamber and is formed with air-breathing Mouth and exhaust outlet, the air entry are used to be passed through low pressure refrigerant, middle pressure refrigerant or high pressure refrigerant, institute into the middle inlet chamber State the suction muffler of one of them and gas outlet connection and the discharge chamber and the middle outlet in two cylinders Chamber is connected, and another the suction muffler in described two cylinders is connected with the exhaust outlet, the middle inlet chamber and institute State between middle outlet chamber provided with control device to control conducting and the cut-off of the middle inlet chamber and the middle outlet chamber; One end of one of them in condenser and evaporator, the condenser and the evaporator is connected with row's refrigerant mouthful, institute Another the one end stated in condenser and the evaporator is connected with the air inlet;Flash vessel, the flash vessel is located at institute State between the other end of condenser and the other end of the evaporator;And first throttle device and second throttling device, it is described First throttle device is located between the condenser and the flash vessel, and the second throttling device is located at the evaporator and institute State between flash vessel;When the cooling and warming circulatory system is run under small load condition, the air entry is to the middle air inlet High pressure refrigerant is passed through in chamber, and the control device controls the middle inlet chamber and the middle outlet chamber conducting;Work as refrigeration Heating recycle system is under big load and ultralow temperature heating condition during stable operation, and the air entry is into the middle inlet chamber Middle pressure refrigerant is passed through, and the control device controls the middle inlet chamber and the middle outlet chamber conducting;Work as cooling and warming When the circulatory system is run under other high load working conditions in addition to being heated except ultralow temperature, the air entry is into the middle inlet chamber Low pressure refrigerant is passed through, and the control device controls the middle inlet chamber and the middle outlet chamber cut-off.
The cooling and warming circulatory system according to embodiments of the present invention, the cooling and warming circulatory system is suitable for Wide Range bar The change of part, is maintained at the Effec-tive Function under each working condition, and can effectively realize fast-refrigerating, heat.
Alternatively, when the cooling and warming circulatory system starts, the air entry is passed through low pressure into the middle inlet chamber Refrigerant;Afterwards, according to the different choice of load:The air entry is passed through high pressure refrigerant into the middle inlet chamber;Or it is described Air entry is passed through middle pressure refrigerant into the middle inlet chamber;Or running status when keeping starting.
Further, provided with the middle pressure breather pipe and low pressure breather pipe being arranged in parallel at the air entry, medium pressure is led to The free end of tracheae is connected with flash vessel, and the free end of the low pressure breather pipe is connected with the air inlet, the flash vessel with On-off control valve is provided between the second throttling device, when cooling and warming circulatory system Defrost operation, the break-make control Valve is closed, and medium pressure breather pipe connects the middle pressure refrigerant so that the flash vessel to be come with the low pressure breather pipe It is delivered to the air inlet.
Further, on-off control valve is provided between the flash vessel and the second throttling device, when cooling and warming is followed During loop system Defrost operation, the on-off control valve is closed, and the air entry is passed through into the middle inlet chamber Middle pressure refrigerant, medium pressure refrigerant is the refrigerant come from the flash vessel.
Further, when the cooling and warming circulatory system is out of service, the air entry is into the middle inlet chamber It is passed through the low pressure refrigerant.
The additional aspect and advantage of the present invention will be set forth in part in the description, and will partly become from the following description Obtain substantially, or recognized by the practice of the present invention.
Brief description of the drawings
The above-mentioned and/or additional aspect and advantage of the present invention will become from description of the accompanying drawings below to embodiment is combined Substantially and be readily appreciated that, wherein:
Fig. 1 is the schematic diagram of the compressor assembly of the cooling and warming circulatory system according to embodiments of the present invention.
Reference:
1:Compressor assembly;11:Compressor;111:Housing;112:Motor;
1111:Arrange refrigerant mouthful;113:Base bearing;114:Supplementary bearing;
1144:Middle inlet chamber;1145:Middle outlet chamber;1146:Air entry;1147:Control valve opening;
115:Upper cylinder;1151:Compression chamber;1152:Piston;116:Lower cylinder;117:Dividing plate;
118:Cover plate;1181:First magnetic element;
12:Reservoir;121:Air inlet;122:Gas outlet;
51:Control valve;52:Control device;82:Control valve group part;
91:Second flexible member;92:Second magnetic element.
Embodiment
Embodiments of the invention are described below in detail, the example of the embodiment is shown in the drawings, wherein from beginning to end Same or similar label represents same or similar element or the element with same or like function.Below with reference to attached The embodiment of figure description is exemplary, is only used for explaining the present invention, and is not considered as limiting the invention.
In the description of the invention, it is to be understood that term " " center ", " transverse direction ", " length ", " width ", " thickness ", " on ", " under ", "front", "rear", "left", "right", " vertical ", " level ", " top ", " bottom ", " interior ", " outer ", " axial direction ", " footpath To ", the orientation of the instruction such as " circumference " or position relationship be, based on orientation shown in the drawings or position relationship, to be for only for ease of and retouch State the present invention and simplify description, rather than indicate or imply that the device or element of meaning there must be specific orientation, with specific Azimuth configuration and operation, therefore be not considered as limiting the invention.
In addition, term " first ", " second ", " the 3rd ", " the 4th " etc. are only used for describing purpose, and it is not intended that indicating Or imply relative importance or the implicit quantity for indicating indicated technical characteristic.Thus, define " first ", " second ", One or more this feature can be expressed or be implicitly included to the feature of " the 3rd ", " the 4th " etc..In retouching for the present invention In stating, unless otherwise indicated, " multiple " are meant that two or more.
In the description of the invention, it is necessary to illustrate, unless otherwise clearly defined and limited, term " installation ", " phase Even ", " connection " should be interpreted broadly, for example, it may be being fixedly connected or being detachably connected, or be integrally connected;Can It to be to be joined directly together, can also be indirectly connected to by intermediary, can be the connection of two element internals.For this area For those of ordinary skill, the concrete meaning of above-mentioned term in the present invention can be understood with concrete condition.
The cooling and warming circulatory system according to embodiments of the present invention is described below with reference to Fig. 1.Wherein, cooling and warming cyclic system System can apply in air-conditioner or heat pump water-heating machine.
As shown in figure 1, the cooling and warming circulatory system according to embodiments of the present invention, including it is compressor 11, reservoir 12, cold Condenser, evaporator, flash vessel, first throttle device and second throttling device.
Compressor 11 and reservoir 12 collectively form compressor assembly 1, and reservoir 12 is located at outside compressor 11, reservoir 12 On be formed with air inlet 121 and gas outlet 122, for example, referring to Fig. 1, air inlet 121 forms the top in reservoir 12, outlet Mouth 122 is formed in the bottom of reservoir 12, and reservoir 12 is used to enter the refrigerant entered inside reservoir 12 from air inlet 121 Row gas-liquid separation, and the gaseous coolant after separation is fed in compressor 11 from gas outlet 122.Alternatively, compressor 11 is Rotary compressor.
Wherein, compressor 11 can be vertical compressor.It is vertical pressure with compressor 11 in the description below the application Illustrated exemplified by contracting machine.Certainly, those skilled in the art are appreciated that compressor 11 can also be horizontal compressor (not shown).Here, it is necessary to which explanation, " vertical compressor " can be understood as the cylinder of the compression mechanism of compressor 11 Central axis upright is in the compressor (as shown in Figure 1) of the mounting surface of compressor 11.Correspondingly, " horizontal compressor " is appreciated that For cylinder central axis be roughly parallel to compressor 11 mounting surface compressor.
Compressor 11 includes housing 111, motor 112 and compression mechanism, as shown in figure 1, the vertically cloth of housing 111 Put, now the central axis of housing 111 vertically extends.Housing 111 is preferably formed into rotary structure, to facilitate processing Manufacture.Motor 112 and compression mechanism are each provided in housing 111, and motor 112 and compression mechanism are set in the vertical direction, and electricity Machine 112 is located at the top of compression mechanism, and motor 112 is connected to be compressed the refrigerant entered in it with compression mechanism.Shell The row's of being formed with refrigerant mouthful 1111 on body 111, for example, referring to Fig. 1, row's refrigerant mouthful 1111 is formed at the top of housing 111, will pressure Outside refrigerant discharge compressor 11 after contracting.
Specifically, compression mechanism includes base bearing 113, cylinder assembly and supplementary bearing 114, base bearing 113 and supplementary bearing 114 are respectively provided at the axial two ends of cylinder assembly, when compressor 11 is vertical compressor, for example in the example of fig. 1, main shaft Hold 113 and supplementary bearing 114 be respectively provided at the top and bottom of cylinder assembly.
When compressor 11 is duplex cylinder compressor, reference picture 1, cylinder assembly includes two cylinders, and (i.e. upper cylinder 115 is with Cylinder 116), dividing plate 117, two slide plates and two pistons 1152, upper cylinder 115 and lower cylinder 116 set in the vertical direction, Dividing plate 117 is located between the two cylinders, and compression chamber 1151 and vane slot are formed with each cylinder, and two pistons 1152 are distinguished Be located in two compression chambers 1151 and can be rolled along the inwall of corresponding compression chamber 1151, vane slot connected with compression chamber 1151 and Along radially extending for cylinder, two slide plates are respectively provided in corresponding vane slot, and each slide plate it is inner respectively with it is corresponding The periphery wall of piston 1152 is only supported so that compression chamber 1151 is divided into suction muffler and discharge chamber, and suction muffler is to be compressed for sucking Refrigerant, discharge chamber is used to discharge the refrigerant after compression.Wherein, direction " interior " can be understood as the direction towards cylinder axis, Its opposite direction is defined as " outer ", i.e. the direction away from cylinder axis.
When compressor 11 is the compressor of more than three cylinders or three cylinders, cylinder assembly include three set in the axial direction or Dividing plate 117 is provided between the cylinder of more than three, two adjacent cylinders.It is appreciated that compressors more than three cylinders or three cylinders 11 other compositions are substantially the same such as piston 1152, slide plate with duplex cylinder compressor, will not be repeated here.Need explanation It is in the description below the application, to be illustrated so that compressor 11 is duplex cylinder compressor as an example, and above-mentioned two cylinder is distinguished Referred to as upper cylinder 115 and lower cylinder 116, to facilitate description.One of them in two cylinders is (for example, the lower cylinder in Fig. 1 116) suction muffler is connected with the gas outlet 122 of reservoir 12.
It is formed with middle inlet chamber 1144 and middle outlet chamber 1145, middle inlet chamber 1144 and is formed with compression mechanism Air entry 1146 and second exhaust port, air entry 1146 are used to be passed through low pressure refrigerant, middle pressure refrigerant into middle inlet chamber 1144 Or high pressure refrigerant.Wherein, the pressure of low pressure refrigerant is less than the pressure of middle pressure refrigerant, and the pressure of middle pressure refrigerant is less than high pressure refrigerant Pressure.
The suction muffler of one of them (for example, lower cylinder 116 in Fig. 1) in two cylinders and the gas outlet of reservoir 1 12 connections, for example, could be formed with connected entrance on dividing plate 117, the gaseous coolant in reservoir 1 after gas-liquid separation can be by this Connected entrance is entered in the above-mentioned suction muffler of one of them in two cylinders.The above-mentioned exhaust of one of them in two cylinders Chamber is connected with middle outlet chamber 1145, and thus, the gaseous coolant after the gas-liquid separation of reservoir 1 can be upper in two cylinders State and entered after being compressed in one of them in middle outlet chamber 1145.
The of the suction muffler of another (for example, upper cylinder 115 in Fig. 1) in two cylinders and middle inlet chamber 1144 Two exhaust outlets are connected, for example, the suction muffler of upper cylinder 115 can be by the second exhaust of air intake passage and middle inlet chamber 1144 Mouth connection, so that low pressure refrigerant, middle pressure refrigerant or the high pressure refrigerant of suction can enter two cylinders via the air intake passage In it is above-mentioned in another.It is provided with control device 52 to control centre to enter between middle inlet chamber 1144 and middle outlet chamber 1145 The conducting of air cavity 1144 and middle outlet chamber 1145 and cut-off.
One end of one of them in condenser and evaporator is connected with row's refrigerant mouthful 1111, in condenser and evaporator Another one end is connected with air inlet 121.Here following two situations are included:Firstth, one end of condenser and row's refrigerant mouthful 1111 connections, one end of evaporator is connected with the air inlet 121 of reservoir 12, and now the cooling and warming circulatory system is refrigeration mould Formula;Secondth, one end of evaporator is connected with row's refrigerant mouthful 1111, and one end of condenser is connected with the air inlet 121 of reservoir 12, Now the cooling and warming circulatory system is heating mode.
Wherein, the mode of communicating between condenser and evaporator and row's refrigerant mouthful 1111 and the air inlet 121 of reservoir 12 It can be realized by four-way control valve.Specifically, four-way control valve includes the first control valve port, the second control valve port, the Three control valve ports and the 4th control valve port, the first control valve port are connected with above-mentioned one end of condenser, the second control valve port and row Refrigerant mouthful 1111 is connected, and the 3rd control valve port is connected with air inlet 121, above-mentioned one end phase of the 4th control valve port and evaporator Even.When the cooling and warming circulatory system is run in cooling mode, the first control valve port of control four-way control valve and the second control Valve port conducting processed, the 3rd control valve port and the 4th control valve port conducting;When the cooling and warming circulatory system is run in a heating mode When, the first control valve port of control four-way control valve and the 3rd control valve port are turned on, the second control valve port and the 4th control valve port Conducting.
Flash vessel is located between the other end of condenser and the other end of evaporator, and flash vessel is used for entering in it Refrigerant carries out shwoot and gas-liquid separation.
First throttle device is located between condenser and flash vessel, second throttling device be located at evaporator and flash vessel it Between, for example, when the cooling and warming circulatory system is run in cooling mode, first throttle device will can be cooled down by condenser Refrigerant expansion afterwards, second throttling device can further expand the refrigerant after flash vessel shwoot.Wherein, first throttle is filled Putting can be for capillary, electric expansion valve, heating power expansion valve etc. with second throttling device, but not limited to this.
When the cooling and warming circulatory system is run under middle refrigeration mode, reference picture 1, can by air entry 1146 to High pressure refrigerant is passed through in middle inlet chamber 1144, control device 52 controls middle inlet chamber 1144 and middle outlet chamber 1145 to lead Logical, now middle inlet chamber 1144 is connected with middle outlet chamber 1145, and the gas pressure of the discharge chamber discharge of lower cylinder 116 is height Press, and the pressure at expulsion in the pressure of inspiration(Pi) and discharge chamber in the suction muffler of cylinder is high pressure (the suction muffler suction of upper cylinder 115 The gas entered comes from middle inlet chamber 1144), now upper cylinder 115 is unloaded, only the compression refrigerant of lower cylinder 116, realizes single cylinder list Level compression.
Wherein, above-mentioned high pressure refrigerant can be to be drained into refrigerant inside housing 111 by the discharge chamber of cylinder, now air-breathing Mouthfuls 1142 inside housing 111 with connecting, for example, can set high pressure breather pipe 811 at air entry 1142 with to middle inlet chamber High pressure refrigerant is passed through in 1144, now one end (for example, upper end in Fig. 1) of high pressure breather pipe 811 can directly with housing 111 Inside connection, certainly, above-mentioned one end of high pressure breather pipe 811 can also be with the top of housing 111 for discharging inside housing 111 Row's refrigerant mouthful 1111 of refrigerant after compression is connected.Or, high pressure breather pipe 811 can also be independently arranged, with to middle air inlet High pressure refrigerant (not shown) is passed through in chamber 1144.
Under the middle refrigeration mode, the first control valve port of four-way control valve and the second control valve port conducting, the 3rd control Valve port processed and the 4th control valve port conducting, the refrigerant after the compression of compressor 11 flow to condenser by four-way control valve, then Flow through successively and enter evaporator after first throttle device, flash vessel and second throttling device, after being absorbed heat through evaporator, flow into liquid storage Device 12, then returnes to compressor 11.Now because cooling and warming circulatory system load is small, single cylinder single stage compress is carried out, is reduced Unnecessary overcompression loss and friction loss, furthermore, it is possible to allow compressor 11 to be transported under the higher frequency of the efficiency of motor 112 OK, and leakage loss is reduced, so as to improve the efficiency of the cooling and warming circulatory system under the operating mode.
, can be by air entry 1146 to middle inlet chamber when the cooling and warming circulatory system is run in a heating mode Middle pressure refrigerant is passed through in 1144, control device 52 controls middle inlet chamber 1144 and middle outlet chamber 1145 to turn on, now middle Inlet chamber 1144 is connected with middle outlet chamber 1145, and for middle pressure, (pressure is phase to the pressure at expulsion in the discharge chamber of lower cylinder 116 The pressure and the internal pressure of housing 111 for the refrigerant that size to pressure, the i.e. pressure is discharged between the gas outlet 122 of reservoir 12 Between), so that mixing of the refrigerant of middle inlet chamber 1144 for the refrigerant and middle pressure refrigerant of the discharge chamber discharge through lower cylinder 116 Refrigerant, upper cylinder 115 carries out second-compressed after sucking the mixing refrigerant, and the refrigerant after compression is discharged to inside housing 111, realizes Two stages of compression.
Wherein, middle pressure refrigerant can be the middle pressure refrigerant from the cooling and warming circulatory system, specifically, air entry 1142 Breather pipe 812 is pressed to be passed through middle pressure refrigerant, one end of middle pressure breather pipe 812 into middle inlet chamber 1144 in can setting in place (for example, upper end in Fig. 1) is connected with flash vessel.Certainly, middle pressure breather pipe 812 can also be independently arranged, with to middle air inlet Middle pressure refrigerant (not shown) is passed through in chamber 1144.
Under the heating mode, the first control valve port of four-way control valve and the 3rd control valve port conducting, the second control valve Mouth and the 4th control valve port conducting, the refrigerant after being compressed through compressor 11 flows to evaporator by four-way control valve, by evaporator Refrigerant out flows into flash vessel after being expanded into middle pressure refrigerant through second throttling device, and gas-liquid two-phase state is flashed into flash vessel And gas-liquid separation, the refrigerant after gas-liquid separation is divided into two-way:The liquid refrigerants of main road is laggard through first throttle device throttling expansion Enter condenser, become gaseous coolant after carrying out heat exchange within the condenser, then flow into above-mentioned one of cylinder of compressor 11 In be compressed;The gaseous coolant of bypass comes out from flash vessel, by it is middle pressure breather pipe 812 enter compressor 11, with it is above-mentioned its In refrigerant after a cylinder compression mixed, mixed refrigerant enters another above-mentioned cylinder, through another cylinder Discharged after compression, so as to complete two stages of compression.
When the cooling and warming circulatory system is applied to heat pump water-heating machine, evaporator and the water tank of the cooling and warming circulatory system enter Row heat exchange, cooling and warming circulatory system circulation is consistent with the above.Thus, pressure difference pressure ratio is larger when heating, particularly low temperature system Under heat and heat pump working condition, using two stages of compression, the heating capacity of the cooling and warming circulatory system can be not only effectively improved, and reduce The pressure ratio of every grade of compression, reduces leakage and clearance influence, and effective recovery section work done during compression is improved under the working condition Efficiency.
When the cooling and warming circulatory system is run under overload refrigeration mode, it can be entered by air entry 1146 to centre Low pressure refrigerant is passed through in air cavity 1144, control device 52 controls middle inlet chamber 1144 and middle outlet chamber 1145 to separate, now The air-flow of middle inlet chamber 1144 and middle outlet chamber 1145 can not mutually circulate, i.e., the refrigerant in middle inlet chamber 1144 can not Enter in middle outlet chamber 1145, and the refrigerant in middle outlet chamber 1145 can not be entered in middle inlet chamber 1144, The gas pressure of the discharge chamber discharge of lower cylinder 116 is high pressure, and the pressure of inspiration(Pi) of the suction muffler of upper cylinder 115 is low pressure, on The pressure at expulsion of the discharge chamber of cylinder 115 is that low-pressure gas is compressed into by high pressure, now upper cylinder 115 and lower cylinder 116 simultaneously Gases at high pressure, so as to realize that twin-tub compresses.
Wherein, low pressure breather pipe 813 can be set to be passed through low pressure cold into middle inlet chamber 1144 at air entry 1142 Matchmaker, one end (for example, upper end in Fig. 1) of low pressure breather pipe 813 is connected with the air inlet 121 of reservoir 12.
Under the overload refrigeration mode, the first control valve port of four-way control valve and the second control valve port conducting, the 3rd Valve port and the 4th control valve port conducting are controlled, the refrigerant after the compression of compressor 11 flows to condenser through four-way control valve, then according to Secondary flow through enters evaporator after first throttle device, flash vessel and second throttling device, after being absorbed heat through evaporator, flows into reservoir 12, then return to compressor 11.Now because cooling and warming circulatory system load is big, while evaporating temperature is also higher, that is, lead If refrigeration requirement is big, single stage compress is carried out using two cylinders, the refrigerant that can be greatly enhanced the cooling and warming circulatory system is followed Circular rector, so that quickly increase the refrigerating capacity under the operating mode, and under overload refrigeration mode, the efficiency of the cooling and warming circulatory system It is high.It is appreciated that selecting which kind of pattern can carry out different selections according to operating mode, the difference of territory of use.
When the cooling and warming circulatory system is run under small load condition, it is cold that air entry is passed through high pressure into middle inlet chamber Inlet chamber and middle outlet chamber conducting in the middle of matchmaker, and control device control;When the cooling and warming circulatory system is in big load and ultralow Temperature heat especially need holding the efficient operating mode of the cooling and warming circulatory system under stable operation when, air entry is into middle inlet chamber It is passed through inlet chamber and middle outlet chamber conducting in the middle of middle pressure refrigerant, and control device control;When the cooling and warming circulatory system except Ultralow temperature is heated when especially needing to keep running under the efficient outer other high load working conditions of the cooling and warming circulatory system, air entry Inlet chamber and middle outlet chamber cut-off in the middle of low pressure refrigerant, and control device control are passed through into middle inlet chamber.
Here, it is necessary to which explanation, " high load working condition " is appreciated that to include high-temperature refrigeration, superhigh temperature refrigeration, low temperature system Heat, ultralow temperature heat these four operating modes, and other operating modes in addition to these four operating modes are " small load condition ", such as middle Refrigeration etc..
The cooling and warming circulatory system according to embodiments of the present invention, the cooling and warming circulatory system is suitable for Wide Range bar The change of part, is maintained at the Effec-tive Function under each working condition, and can effectively realize fast-refrigerating, heat.
According to the specific embodiment of the present invention, compression mechanism also includes:Cover plate 118, cover plate 118 is located at base bearing 113 and the side of the remote cylinder assembly of one of them in supplementary bearing 114, in base bearing 113 and supplementary bearing 114 it is above-mentioned its In middle inlet chamber 1144 and middle outlet chamber 1145 are limited between one and cover plate 118.For example, as shown in figure 1, cover plate 118 are located at the bottom of supplementary bearing 114, and cover plate 118 is formed as horizontally extending flat board, middle inlet chamber 1144 and centre Outlet chamber 1145 is limited jointly by supplementary bearing 114 and cover plate 118, and air entry 1142 and exhaust outlet can be both formed in supplementary bearing On 114.Or, cover plate 118 can also be located at the top of base bearing 113, now middle inlet chamber 1144 and middle outlet chamber 1145 are limited (not shown) jointly by base bearing 113 and the cover plate 118.
Certainly, dividing plate 117, which includes limiting centre between two sub-dividing plates 117 (not shown), two sub-dividing plates 117, enters Air cavity 1144 and middle outlet chamber 1145.Specifically, two sub-dividing plates 117 can be set in the vertical direction, the son of top The bottom-open of dividing plate 117, the sub-dividing plate 117 of lower section is horizontally extending and is located at the bottom of the sub-dividing plate 117 of top, this When in the middle of inlet chamber 1144 and middle outlet chamber 1145 limited jointly by the two sub-dividing plates 117.It is, of course, also possible to be lower section The top of sub-dividing plate 117 open wide, the sub-dividing plate 117 of top is horizontally extending and the top of sub-dividing plate 117 that is positioned below Portion.
When the cooling and warming circulatory system starts, air entry 1146 is passed through low pressure refrigerant into middle inlet chamber 1144;It Afterwards, after it have passed through the arbitrary time, according to the different choice of load:
Air entry 1146 is passed through high pressure refrigerant into middle inlet chamber 1144;Or
Air entry 1146 is passed through middle pressure refrigerant into middle inlet chamber 1144;Or
Running status when keeping starting.Wherein, " difference of load " here can be understood as above-mentioned small negative Lotus operating mode or high load working condition.
When system just starts, the use twin-tub of compressor 11 operational mode (it is essentially identical with overload cooling operation mode, Certainly, according to the difference freezed and heated, the flow direction of refrigerant is different).Due on startup, being particularly (example under severe conditions Such as, when overload is freezed or heated), for example, when the cooling and warming circulatory system is applied to air-conditioner, user typically requires quick Temperature is dropped to (or being raised to) design temperature, using twin-tub mode operation, cooling and warming circulation can be significantly greatly increased on startup The refrigerant circulation of system, quickly sets up pressure difference, so as to realize that fast-refrigerating is heated, improves comfortableness.
Reference picture 1, specifically, control device 52 include being formed with control valve opening 1147 in control valve element, compression mechanism, The communicating passage for connecting middle inlet chamber 1144 with middle outlet chamber 1145, control are formed with the side wall for controlling valve opening 1147 Valve element is movably arranged in control valve opening 1147 to turn on and separate communicating passage.
For example, control valve opening 1147 is formed on supplementary bearing 114, and control valve opening 1147 extends through pair along the vertical direction The upper surface and lower surface of bearing 114, communicating passage formation is on the side wall of control valve opening 1147, and control valve element can be moved up and down Ground is located in control valve opening 1147, when controlling valve element to be in the position shown in Fig. 1, control valve element closure communicating passage, this When in the middle of inlet chamber 1144 and middle outlet chamber 1145 separated, when controlling position of the valve element shown in Fig. 1 to move upwards, Middle inlet chamber 1144 is connected with middle outlet chamber 1145 by communicating passage.Thus, by using vertically arranged mode, no It is only easy to process, and the driving force of its motion can be increased using the gravity for controlling valve element itself.
Wherein, communicating passage can include the first subchannel and the second subchannel, and the first subchannel and the second subchannel exist Control the circumferentially spaced apart from one another of valve opening 1147, neighbouring middle inlet chamber of the first subchannel formation in control valve opening 1147 1144 side, the first subchannel connects middle inlet chamber 1144 with the inside of control valve opening 1147, and the formation of the second subchannel exists The side of the neighbouring middle outlet chamber 1145 of valve opening 1147 is controlled, the second subchannel is by middle outlet chamber 1145 and controls valve opening 1147 inside are connected.Wherein, the first subchannel and the second subchannel can be obliquely installed, to facilitate processing, but not limited to this.
Control valve element moving direction (for example, above-below direction in Fig. 1) on, control valve opening 1147 one end (for example, Upper end in Fig. 1) it can be connected by the first connected entrance with the gas outlet 122 of reservoir 12, so that through the gas-liquid point of reservoir 12 Gaseous coolant from after can enter the upper end of control valve opening 1147 by gas outlet 122, and the upper end for now controlling valve element is Low pressure, the other end (for example, lower end in Fig. 1) of control valve opening 1147 can pass through the second connected entrance and middle inlet chamber 1144 Connection, so that low pressure refrigerant, middle pressure refrigerant or high pressure refrigerant can enter control valve opening 1147 by middle inlet chamber 1144 Lower end, now control valve element lower end be low pressure, medium-pressure or high pressure.Thus, the air pressure switching of middle inlet chamber 1144, can make Control valve element is moved up and down, so that inlet chamber 1144 and middle outlet chamber 1145 in the middle of connecting or separating.
When being passed through low pressure refrigerant in middle inlet chamber 1144, the pressure balance of the upper surface and lower surface of valve element is controlled, Control valve element is remained stationary as under the Action of Gravity Field of itself, and middle inlet chamber 1144 and middle outlet chamber 1145 separate, so as to make The compressor 11 of cold heating recycle system can be run under twin-tub operational mode.When being passed through in middle inlet chamber 1144, middle pressure is cold Matchmaker or during high pressure refrigerant, control valve element is moved upwards in the presence of the pressure difference of two ends, middle inlet chamber 1144 and middle outlet chamber 1145 connections, so that the compressor 11 of the cooling and warming circulatory system can be under single cylinder operational mode or twin-stage jet operational mode Operation.
Further, control valve element is provided with the first flexible member (not shown), and the first flexible member is located at control valve The above-mentioned one end in hole 1147, and/or the other end of control valve opening 1147 are provided with the first magnetic member being suitable to control valve element absorption Part 1181.Here following three kinds of situations are included:Firstth, the first flexible member only is set on control valve element;Secondth, only in control The above-mentioned other end of valve opening 1147 sets the first magnetic element 1181;3rd, while setting the first elasticity member on control valve element Part, and first magnetic element 1181 is set in the above-mentioned other end of control valve opening 1147.Wherein, the first flexible member can be bullet Spring, the first magnetic element 1181 can be magnet, but not limited to this.
For example, spring stop be against control valve element upper end and control valve opening 1147 roof between, when control valve element it is upper When lower two ends have pressure difference, control valve element can overcome the elastic force of spring to move upwards, so as to connect the middle He of inlet chamber 1144 Middle outlet chamber 1145;When controlling the upper and lower ends pressure balance of valve element, spring can compress control valve element downwards, enhance The driving force of valve core movement is controlled, and prevents the pressure oscillation at control valve element two ends and produces motion.
As shown in figure 1, magnet is located on cover plate 118, specifically, it is formed with and is downwardly concaved on the upper surface of cover plate 118 Groove, magnet is contained in groove, and when the upper and lower ends for controlling valve element have pressure difference, control valve element can overcome magnet Absorption affinity is moved upwards, so as to connect middle inlet chamber 1144 and middle outlet chamber 1145;When the upper and lower ends pressure of control valve element During dynamic balance, control valve element so as to enhance the driving force of control valve core movement, and can prevent control valve with magnet adsorption The pressure oscillation at core two ends and produce motion.
Certainly, the invention is not restricted to this, control valve opening 1147 extends along inward-outward direction, and control valve element inside and outside can movably be set In control valve opening 1147 (not shown).Communicating passage formation is on the side wall of control valve opening 1147, specifically, and connection is logical Road includes the first subchannel and the second subchannel, and the first subchannel will connect inside middle inlet chamber 1144 and control valve opening 1147 Logical, the second subchannel connects middle outlet chamber 1145 with the inside of control valve opening 1147.Wherein, direction " interior " can be understood as court To the direction at the center of supplementary bearing 114, its opposite direction is defined as " outer ", i.e. the direction away from the center of supplementary bearing 114.Work as control When valve element is in the position in outside, middle inlet chamber 1144 is connected with middle outlet chamber 1145 by communicating passage, when control valve When core is moved from outside to inside, control valve element closure communicating passage, now in the middle of inlet chamber 1144 and middle outlet chamber 1145 by every It is disconnected.Thus, easy to process and low cost.
On the moving direction (i.e. inward-outward direction) of control valve element, one end (such as outer end) and the liquid storage of valve opening 1147 are controlled The gas outlet 122 of device 12 is connected, so that the gaseous coolant after the gas-liquid separation of reservoir 12 can be entered by gas outlet 122 Control the outer end of valve opening 1147, the outer end for now control valve element is low pressure, control valve opening 1147 the other end (such as inner) and Middle inlet chamber 1144 is connected, so that low pressure refrigerant, middle pressure refrigerant or high pressure refrigerant can be entered by middle inlet chamber 1144 To the inner of control valve opening 1147, the inner for now controlling valve element is low pressure, medium-pressure or high pressure.Thus, middle inlet chamber 1144 Air pressure switching, control valve element can be made to be moved up in interior foreign side, thus connect or separate centre inlet chamber 1144 and centre go out Air cavity 1145.
When being passed through low pressure refrigerant in middle inlet chamber 1144, the inner face of valve element and the pressure balance of outer face are controlled, Control valve element is remained stationary as in control valve opening 1147, and middle inlet chamber 1144 and middle outlet chamber 1145 separate, so as to freeze The compressor 11 of heating recycle system can be run under twin-tub operational mode.When being passed through middle pressure refrigerant in middle inlet chamber 1144 Or during high pressure refrigerant, control valve element is moved out in the presence of the pressure difference of two ends, middle inlet chamber 1144 and middle outlet chamber 1145 connections, so that the compressor 11 of the cooling and warming circulatory system can be in single cylinder operational mode or twin-stage jet operational mode Lower operation.
First flexible member such as spring can be only against between the outer end of control valve element and the inwall for controlling valve opening 1147, When the inside and outside two ends for controlling valve element have pressure difference, control valve element can overcome the elastic force of spring to move out, so that in connecting Between inlet chamber 1144 and middle outlet chamber 1145;When controlling the inside and outside pressure at two ends balance of valve element, spring can be compressed inwardly Valve element is controlled, the driving force of control valve core movement is enhanced, and prevents the pressure oscillation at control valve element two ends and produces motion.
First magnetic element 1181 such as magnet can be located in control valve opening 1147, and magnet can be located at control valve opening The side at 1147 center of neighbouring supplementary bearing 114.When the inside and outside two ends for controlling valve element have pressure difference, control valve element can overcome The absorption affinity of magnet is moved out, so as to connect middle inlet chamber 1144 and middle outlet chamber 1145;Inside and outside control valve element When pressure at two ends is balanced, control valve element so as to enhance the driving force of control valve core movement, and can be prevented with magnet adsorption Control the pressure oscillation at valve element two ends and produce motion.
Being provided with air entry 1146 is used to control to be passed through low pressure refrigerant, middle pressure refrigerant or high pressure into middle inlet chamber 1144 The control valve group part 82 of refrigerant.Specifically, for example, as shown in figure 1, control valve group part 82 includes four-way valve, four-way valve has Four valve ports, one of valve port is connected with air entry 1142, the other three valve port air inlet 121 respectively with reservoir 12, The flash vessel of the cooling and warming circulatory system and row's refrigerant mouthful 1111 of housing 111 are connected.
Certainly, control valve group part 82 can also include three magnetic valves (not shown) being arranged in parallel, each magnetic valve Be respectively provided at low pressure breather pipe 813, it is middle pressure breather pipe 812 and high pressure breather pipe 811 on, with control respectively low pressure breather pipe 813, The conducting and disconnection of middle pressure breather pipe 812 and high pressure breather pipe 811.Or, control valve group part 82 can also include being arranged in series Two triple valves (not shown).
As shown in figure 1, middle pressure breather pipe 812 and low pressure breather pipe 813 are arranged in parallel at air entry, middle pressure breather pipe 812 free end (for example, upper end in Fig. 1) is connected with flash vessel, and the free end of low pressure breather pipe 813 is (for example, in Fig. 1 Upper end) it is connected with the air inlet 121 of reservoir 12, on-off control valve is provided between flash vessel and second throttling device.Work as refrigeration During heating recycle system Defrost operation, on-off control valve is closed, and middle pressure breather pipe 812 connects with low pressure breather pipe 813 Pass to the air inlet 121 that the middle pressure refrigerant that flash vessel comes is delivered to reservoir 12.
For example, pressure breather pipe 812 is connected with low pressure breather pipe 813 in being controlled by control valve group part 82, and it will dodge The refrigerant that steaming device comes is imported as air-breathing in the suction muffler of upper cylinder 115 and lower cylinder 116.Thus, in Defrost operation, lead to Cross and connect middle pressure breather pipe 812 with low pressure breather pipe 813, it is possible to prevente effectively from lower cylinder 116 may go out in Defrost operation The situation of existing intake negative-pressure.And in defrosting, because high-low pressure pressure difference is small, pressure ratio is small, it is possible to prevente effectively from using two stages of compression And cause overcompression, the situation for causing power consumption to rise.
Further, on-off control valve is provided between flash vessel and second throttling device, when the cooling and warming circulatory system is removed During frost operation, on-off control valve is closed, and air entry 1146 is passed through middle pressure refrigerant, middle pressure into middle inlet chamber 1144 Refrigerant is the refrigerant come from flash vessel.For example, refrigerant can be pressed via middle inlet chamber by middle by control valve group part 82 1144 are passed into the suction muffler of upper cylinder 115, and now middle pressure refrigerant includes the refrigerant come from flash vessel.
In this circulation, the refrigerant after being compressed through compressor 11 flows to condenser through four-way control valve, is come out by condenser Refrigerant expanded through first throttle device, refrigerant after expansion flows into flash vessel, and the refrigerant come out from flash vessel passes through middle pressure Breather pipe 812 enters compressor 11.Now, the middle pressure refrigerant that the air-breathing of upper cylinder 115 is passed through from middle pressure breather pipe 812, is formed Single cylinder is run, and when the cooling and warming circulatory system is applied to air-conditioner, the indoor set of air-conditioner flows without refrigerant circulation, it is to avoid Indoor set cycle heat exchange during defrosting and make indoor temperature decline it is too fast.
Two cylinders have two slide plate chambers for being located at vane slot rear portion, that is to say, that after the vane slot of each cylinder Portion is a slide plate chamber, and vane slot includes slide plate chamber, and slide plate chamber is located at least one in the rear side of slide plate, two of which slide plate chamber It is individual to be connected with the inside of housing 111.Here, it is necessary to which explanation, direction " rear " can be understood as the direction away from cylinder axis, its Opposite direction is defined as " elder generation ", i.e. the direction towards cylinder axis.Thus, it is possible to using between the tip of slide plate and rear end Pressure difference acts to control slide plate.
Alternatively, in two slide plate chambers it is provided with the second such as spring of flexible member 91 at least one, slide plate passes through the Two flexible members 91 are movably arranged in corresponding vane slot.For example, spring is one, and the spring is located at lower cylinder 116 Slide plate chamber in, in other words, spring is not provided with the slide plate chamber of upper cylinder 115, so can not only save spring, reduction production Cost, moreover, when the air-breathing pressure at expulsion of upper cylinder 115 identical (i.e. single cylinder operational mode), due to no spring effect, slide plate Piston 1152 would not be propped up, so as to avoid the friction between slide plate tip and piston 1152, abrasion and power is reduced.
Further, compression mechanism is provided with the second magnetic of the slide plate in one of them being suitable in two cylinders of absorption Element 92.For example, being formed with the holding tank suitable for accommodating the second magnetic element 92 on the upper surface of dividing plate 117, holding tank is located at The lower section of slide plate in upper cylinder 115, thus, the slide plate more stably can be maintained in vane slot, will not be because of air pressure inside Fluctuate and produce motion, cause slide plate to be produced with piston 1152 or cylinder and collide, damage parts are caused, so as to improve compressor 11 reliability.Certainly, the second magnetic element 92 can also be located at the side of the neighbouring cylinder of base bearing 113.Alternatively, second Magnetic element 92 is magnet.
Alternatively, another the above-mentioned swept volume in two cylinders be less than in two cylinders it is above-mentioned one of them Swept volume.Thus, it is possible to improve the efficiency that compressor 11 is run under twin-stage jet operational mode.Wherein, " swept volume " Definition to be well known to those skilled in the art, no longer describe in detail herein.
Further, when the cooling and warming circulatory system is out of service, air entry 1146 is passed through into middle inlet chamber 1144 Low pressure refrigerant.
The compressor 11 of the cooling and warming circulatory system according to embodiments of the present invention, can select single cylinder operational mode, Run under twin-tub operational mode, twin-stage jet operational mode, occur the situation of overcompression in Smaller load so as to avoid, and During big load, the cold or heat demand of the cooling and warming circulatory system can be met, the cooling and warming circulatory system and its pressure is improved Performance of the contracting machine 11 under various environment temperatures, improves the efficiency of the cooling and warming circulatory system, it is possible to provide different colds Demand, meets comfortableness requirement.
Other of the cooling and warming circulatory system according to embodiments of the present invention are constituted and operated for people in the art All it is known for member, is not detailed herein.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " illustrative examples ", The description of " example ", " specific example " or " some examples " etc. means to combine specific features, the knot that the embodiment or example are described Structure, material or feature are contained at least one embodiment of the present invention or example.In this manual, to above-mentioned term Schematic representation is not necessarily referring to identical embodiment or example.Moreover, specific features, structure, material or the spy of description Point can in an appropriate manner be combined in any one or more embodiments or example.
Although an embodiment of the present invention has been shown and described, it will be understood by those skilled in the art that:Not In the case of departing from the principle and objective of the present invention a variety of change, modification, replacement and modification can be carried out to these embodiments, this The scope of invention is limited by claim and its equivalent.

Claims (5)

1. a kind of cooling and warming circulatory system, it is characterised in that including:
Reservoir, the reservoir has air inlet and gas outlet;
Compressor, the compressor includes housing and the compression mechanism being located in the housing, and the compression mechanism includes cylinder Component and be located at the cylinder assembly axial two ends base bearing and supplementary bearing, the cylinder assembly include two cylinders, And the dividing plate being located between described two cylinders, each cylinder has compression chamber, and the compression chamber includes suction muffler and row It is formed with air cavity, the compression mechanism on middle inlet chamber and middle outlet chamber, the middle inlet chamber and is formed with air entry And exhaust outlet, the air entry is used to be passed through low pressure refrigerant, middle pressure refrigerant or high pressure refrigerant into the middle inlet chamber, described The suction muffler of one of them and gas outlet connection and the discharge chamber and the middle outlet chamber in two cylinders Connection, another the suction muffler in described two cylinders is connected with the exhaust outlet, the middle inlet chamber and described Control device is provided between middle outlet chamber to control conducting and the cut-off of the middle inlet chamber and the middle outlet chamber;
One end of one of them in condenser and evaporator, the condenser and the evaporator is connected with row's refrigerant mouthful, institute Another the one end stated in condenser and the evaporator is connected with the air inlet;
Flash vessel, the flash vessel is located between the other end of the other end of the condenser and the evaporator;And
First throttle device and second throttling device, the first throttle device be located at the condenser and the flash vessel it Between, the second throttling device is located between the evaporator and the flash vessel;
When the cooling and warming circulatory system is run under small load condition, the air entry is passed through height into the middle inlet chamber Refrigerant is pressed, and the control device controls the middle inlet chamber and the middle outlet chamber conducting;When cooling and warming cyclic system System is under big load and ultralow temperature heating condition during stable operation, and it is cold that the air entry is passed through middle pressure into the middle inlet chamber Matchmaker, and the control device controls the middle inlet chamber and the middle outlet chamber conducting;When the cooling and warming circulatory system exists When being run under other high load working conditions in addition to ultralow temperature is heated, the air entry is passed through low pressure cold into the middle inlet chamber Matchmaker, and the control device controls the middle inlet chamber and the middle outlet chamber cut-off.
2. the cooling and warming circulatory system according to claim 1, it is characterised in that when the cooling and warming circulatory system starts When, the air entry is passed through low pressure refrigerant into the middle inlet chamber;Afterwards, according to the different choice of load:
The air entry is passed through high pressure refrigerant into the middle inlet chamber;Or
The air entry is passed through middle pressure refrigerant into the middle inlet chamber;Or
Running status when keeping starting.
3. the cooling and warming circulatory system according to claim 1 or 2, it is characterised in that provided with parallel connection at the air entry The middle pressure breather pipe and low pressure breather pipe set, the free end of medium pressure breather pipe is connected with flash vessel, the low pressure ventilation The free end of pipe is connected with the air inlet, and on-off control valve is provided between the flash vessel and the second throttling device,
When cooling and warming circulatory system Defrost operation, the on-off control valve is closed, medium pressure breather pipe with The low pressure breather pipe connects the middle pressure refrigerant that the flash vessel comes being delivered to the air inlet.
4. the cooling and warming circulatory system according to claim 1, it is characterised in that the flash vessel and the described second throttling On-off control valve is provided between device,
When cooling and warming circulatory system Defrost operation, the on-off control valve is closed, and the air entry is to described Middle pressure refrigerant is passed through in middle inlet chamber, medium pressure refrigerant is the refrigerant come from the flash vessel.
5. the cooling and warming circulatory system according to claim 1, it is characterised in that the cooling and warming circulatory system stops During operation, the air entry is passed through the low pressure refrigerant into the middle inlet chamber.
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