CN210165602U

CN210165602U - Double-stage compression adjustable dryness refrigerating system with ejector

Info

Publication number: CN210165602U
Application number: CN201920231887.3U
Authority: CN
Inventors: 钟天明; 丁力行; 陈嘉澍; 张平湖; 吕金虎; 卓献荣; 陈姝; 刘少达; 李金成
Original assignee: Zhongkai University of Agriculture and Engineering
Current assignee: Zhongkai University of Agriculture and Engineering
Priority date: 2019-02-20
Filing date: 2019-02-20
Publication date: 2020-03-20
Anticipated expiration: 2029-02-20

Abstract

The utility model provides a take adjustable dryness fraction refrigerating system of doublestage compression of sprayer, includes refrigeration main loop and sprays the module, and the refrigeration main loop is including the primary compressor, second grade compressor, the condenser device with adjustable the dryness fraction, choke valve, the evaporimeter device with adjustable the dryness fraction that communicate in proper order, sprays the module and includes electronic valve, vapour and liquid separator I, sprayer and vapour and liquid separator II. The utility model discloses an improvement of above-mentioned structure, the condensation process liquid film that the doublestage compression intercooling refrigerating system that can overcome prior art exists effectively is gathered, condensation heat exchange efficiency is lower, the regional evaporation efficiency of low dryness fraction is low in the evaporation process to and intercooling efficiency is not high, it is lower to cause the whole efficiency of refrigeration cycle, consumptive material and indirect heating equipment occupation space are more not enough, it is succinct to have the structure, heat exchange efficiency is higher, maintain characteristics such as simple and convenient, energy-conserving material occupation space is little, therefore, the clothes hanger is strong in practicability.

Description

Double-stage compression adjustable dryness refrigerating system with ejector

Technical Field

The utility model relates to a refrigerating system field specifically is a take doublestage compression adjustable dryness fraction refrigerating system of sprayer.

Background

The traditional two-stage compression refrigeration system mainly comprises two compressors, a condenser, an evaporator, an intermediate cooling device and the like. In a conventional two-stage compression refrigeration system, if the system efficiency or the cooling capacity of the refrigeration cycle is to be improved, the heat exchange areas of the evaporator and the condenser are increased, so as to improve the energy exchange efficiency, but the material consumption is obviously increased, and the miniaturization of the equipment is not facilitated. In addition, in the condensation process, steam is often condensed into condensate on the wall surface of the condenser and spreads into a liquid film, but the liquid film has poor heat conductivity, the heat transfer is seriously influenced, and the condensation efficiency of the condenser is relatively low; in the evaporation process, because the heat exchange tube has the defects of low flow speed, low heat exchange coefficient and the like in the low-dryness evaporation process, the heat exchange efficiency of the traditional evaporator in a low-dryness area is not high, and when fluid is in a high-dryness nucleate boiling area, the evaporation heat exchange efficiency is obviously improved.

Therefore, how to improve the working energy efficiency of a dual-stage compression intercooling refrigeration system without increasing the heat exchange area and the occupied space of the equipment becomes a problem to be solved by those skilled in the art, and further improvement is needed.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a structure is succinct, heat exchange efficiency is higher, maintain simple and convenient, energy-conserving material-saving occupation space is little take doublestage compression adjustable dryness fraction refrigerating system of sprayer to overcome the weak point among the prior art.

The double-stage compression adjustable dryness refrigerating system with the ejector comprises a refrigeration main circulation and an injection module, and is characterized in that: the refrigeration main circulation comprises a primary compressor, a secondary compressor, a dryness adjustable condenser device, a throttle valve and a dryness adjustable evaporator device, wherein the inlet and the outlet of the primary compressor, the secondary compressor, the dryness adjustable condenser device, the throttle valve and the dryness adjustable evaporator device are sequentially communicated; the injection module comprises an electronic valve, a gas-liquid separator I, an ejector and a gas-liquid separator II, wherein an inlet of the electronic valve is communicated with an outlet of the dryness-adjustable condenser device, an outlet of the electronic valve is communicated with an inlet of the gas-liquid separator I, an outlet of the gas-liquid separator I is communicated with an outlet of the dryness-adjustable condenser device, an inlet of the throttle valve and one inlet of the ejector respectively, the other inlet of the ejector is communicated with an outlet of the dryness-adjustable evaporator device and an inlet of the primary compressor respectively, an outlet of the ejector is communicated with an inlet of the gas-liquid separator II, and an outlet of the gas-liquid separator II is communicated with an outlet of the gas-liquid separator I, an outlet of the dryness-adjustable condenser device, an inlet of the throttle valve, an outlet of the primary.

The dryness adjustable condenser device comprises a heat exchange tube and a dryness adjusting header; the two dryness adjusting headers are respectively provided with a connecting pipe, and two ends of the heat exchange pipe are respectively communicated with the two connecting pipes; the two connecting pipes are provided with a plurality of built-in sealing clapboards at the same horizontal height position, and the two connecting pipes are separated into a plurality of heat exchange tube passes through the built-in sealing clapboards.

The side part of the connecting pipe is also provided with a plurality of dryness adjusting devices which are convex semicircular sleeves, the dryness adjusting devices are respectively communicated with the connecting pipes at the upper side and the lower side of the built-in sealing partition plate, and a liquid drainage connecting pipe is also arranged between the convex sides of two adjacent dryness adjusting devices at the same side and is communicated with the convex sides of the two adjacent dryness adjusting devices at the same side through the liquid drainage connecting pipe; and the outlets of the two connecting pipes are also respectively provided with a gaseous working medium bypass port.

One of the two connecting pipes is also provided with an inlet and an outlet; the dryness adjusting device comprises an outer pipe and an inner pipe arranged in the outer pipe, and a plurality of inner pipe small holes are further drilled on the convex side of the inner pipe.

The dryness adjustable evaporator device comprises an adjustable dryness evaporator, a diffuser pipe and an air adjusting inner pipe; the outlet of the evaporator of the adjustable dryness evaporator is communicated with the inlet of the diffuser pipe, and the outlet of the diffuser pipe is communicated with the air adjusting inner pipe.

The adjustable dryness evaporator comprises a high dryness heat exchange tube, a low dryness adjusting heat exchange tube and a header; wherein, the header is provided with two, and the both ends of high quality heat exchange tube, low quality regulation heat exchange tube communicate with two headers respectively.

The gas regulating inner pipe is provided with a plurality of gas regulating inner pipe small holes along the axial direction, and the gas regulating inner pipes are inserted in parallel on the low-dryness regulating heat exchange pipe and form a sleeve structure.

The header is provided with a paired imperforate partition and an open pore partition; wherein, the imperforate partition and the perforated partition are arranged at the inlet of the high-dryness heat exchange tube and the low-dryness adjusting heat exchange tube in a matching way; the imperforate partition is positioned above the perforated partition, and the perforated partition is also provided with a flow guide pipe.

The inlet of the low-dryness adjusting heat exchange tube is inserted on the header, and the insertion length of the low-dryness adjusting heat exchange tube is larger than the 2/3 diameter of the header.

And part of the pressurized working medium discharged by the diffuser pipe is used for adjusting the dryness of the evaporation process through the air adjusting inner pipe, part of the pressurized working medium is used as an injection fluid to enter the ejector, and the rest of the pressurized working medium enters the primary compressor.

The utility model discloses an improvement of above-mentioned structure, the condensation process liquid film that the cooling system exists in the middle of can overcoming prior art's doublestage compression effectively gathers, and condensation heat exchange efficiency is lower, and the regional evaporation efficiency of low dryness fraction is low in the evaporation process to and intercooling efficiency is not high, and it is lower to cause the whole efficiency of refrigeration cycle, and consumptive material and indirect heating equipment occupation space are more not enough.

Compared with the prior art, the working medium is kept to be condensed in the condenser at high dryness by the dryness adjustable condenser device, saturated gaseous working medium is bypassed from the outlet of the gas-liquid separator to be taken as injection fluid to enter the ejector, meanwhile, the working medium is kept to be evaporated in a high-efficiency flow state by the dryness adjustable evaporator device, the heat exchange efficiency in the evaporation process is effectively improved, in addition, low-pressure overheated working medium is bypassed at the outlet of the dryness adjustable evaporator device to be taken as injection fluid to enter the ejector, the ejector is communicated with the outlet of the primary compressor, so as to construct a two-stage compression intermediate cooling refrigeration system, the ejector is utilized to construct the two-stage compression intermediate cooling refrigeration system, the high-efficiency evaporation process and the condensation process are constructed as a main line, and the heat exchange efficiency in the evaporation process and the condensation process can be effectively improved under the condition, the energy and working medium are saved, the pollution is reduced, the space occupation of equipment can be reduced to a certain degree, and the circulating energy efficiency of the refrigerating system is obviously improved.

Comprehensively, it has characteristics such as the structure is succinct, heat exchange efficiency is higher, maintain simple and convenient, energy-conserving material-saving occupation space is little, and the practicality is strong.

Drawings

Fig. 1 is a schematic structural diagram of a first embodiment of the present invention.

Fig. 2 is a structural diagram of a condenser apparatus with adjustable dryness according to a first embodiment of the present invention.

Fig. 3 is a structural diagram of an adjustable dryness evaporator device according to a first embodiment of the present invention.

Fig. 4 is a pressure enthalpy diagram of the first embodiment of the present invention.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and examples.

Referring to fig. 1-4, the two-stage compression adjustable dryness fraction refrigerating system with the ejector comprises a main refrigerating cycle and an injection module, wherein the main refrigerating cycle comprises a primary compressor 1, a secondary compressor 2, an adjustable dryness fraction condenser device 3, a throttle valve 4 and an adjustable dryness fraction evaporator device 5, the inlets and the outlets of which are sequentially communicated; the injection module comprises an electronic valve 6, a gas-liquid separator I7, an injector 8 and a gas-liquid separator II 9, the inlet of the electronic valve 6 is communicated with the outlet of the dryness-adjustable condenser device 3, the outlet of the electronic valve 6 is communicated with the inlet of the gas-liquid separator I7, the outlet of the gas-liquid separator I7 is respectively communicated with the outlet of the dryness-adjustable condenser device 3, the inlet of the throttle valve 4 and one inlet of the ejector 8, the other inlet of the ejector 8 is respectively communicated with the outlet of the dryness-adjustable evaporator device 5 and the inlet of the primary compressor 1, the outlet of the ejector 8 is communicated with the inlet of the gas-liquid separator II 9, and the outlet of the gas-liquid separator II 9 is respectively communicated with the outlet of the gas-liquid separator I7, the outlet of the dryness-adjustable condenser device 3, the inlet of the throttle valve 4, the outlet of the primary compressor 1 and the inlet of the secondary compressor 2.

The working medium is discharged from the compressor 2 and then enters the dryness adjustable condenser device 3 to carry out the dryness adjustable condensation process; the working medium enters an evaporator device 5 with adjustable dryness to carry out adjustable dryness type evaporation; the working medium bypasses a saturated gaseous working medium from the dryness-adjustable condenser device 3 to be used as an injection fluid to enter the injector 8, and the injector 8 injects a plurality of low-pressure working mediums from the outlet of the dryness-adjustable evaporator device 5 and finally mixes the low-pressure working mediums with the exhaust of the primary compressor 1 together. The refrigeration main circulation and the injection module jointly form a high-efficiency double-stage compression refrigeration system.

Further, the dryness-adjustable condenser apparatus 3 includes a heat exchange pipe 32 and a dryness-adjusting header 33; two dryness adjusting headers 33 are arranged, connecting pipes 331 are respectively arranged on the two dryness adjusting headers 33, and two ends of the heat exchange pipe 32 are respectively communicated with the two connecting pipes 331; the two connecting pipes 331 are provided with a plurality of built-in sealing partition plates 332 at the same horizontal height position, and the two connecting pipes 331 are divided into a plurality of heat exchange tube passes through the plurality of built-in sealing partition plates 332. The two-phase working medium enters a subsequent tube pass for high-efficiency heat exchange after being subjected to dryness adjustment through dryness adjustment headers 33 at two ends of the heat exchange tube 32.

Furthermore, the side part of the connecting pipe 331 is further provided with a plurality of dryness adjusting devices 333, the dryness adjusting devices 333 are convex semicircular sleeves, the dryness adjusting devices 333 are respectively communicated with the connecting pipe 331 on the upper side and the lower side of the built-in sealing partition 332, and a liquid drainage connecting pipe 336 is further arranged between the convex sides of two adjacent dryness adjusting devices 333 on the same side and communicated with the convex sides through the liquid drainage connecting pipe 336; and the outlets of the two connecting pipes 331 are also respectively provided with a gaseous working medium bypass port 35.

Further, one of the two connecting pipes 331 is further provided with an inlet 31 and an outlet 34; the dryness adjusting device 333 comprises an outer tube 3331 and an inner tube 334 disposed inside the outer tube 3331, wherein a plurality of inner tube small holes 335 are drilled on the convex side of the inner tube 334. The outer tube 3331 carries condensate and the inner tube 334 carries high-dryness fluid.

Further, the dryness adjustable evaporator device 5 comprises an adjustable dryness evaporator 52, a diffuser pipe 51 and an air adjusting inner pipe 54; the evaporator outlet 525 of the adjustable dryness evaporator 52 is communicated with the inlet of the diffuser pipe 51, and the outlet of the diffuser pipe 51 is communicated with the air adjusting inner pipe 54.

Further, the adjustable dryness evaporator 52 comprises a high dryness heat exchange pipe 523, a low dryness adjusting heat exchange pipe 524 and a header 522; two headers 522 are arranged, and two ends of the high-dryness heat exchange tube 523 and two ends of the low-dryness adjusting heat exchange tube 524 are respectively communicated with the two headers 522.

Further, the air-conditioning inner tube 54 is axially provided with a plurality of air-conditioning inner tube small holes 541, and the air-conditioning inner tube 54 is inserted in parallel on the low-dryness conditioning heat exchange tube 524 to form a sleeve structure.

Preferably, the density and total open area of the air conditioning inner tube apertures 541 of the air conditioning inner tube 54 decreases progressively according to the flow direction of the working medium of the low-dryness conditioning heat exchange tube 524.

Further, the header 522 is provided with a paired imperforate partition 531 and an apertured partition 532; wherein, the imperforate partition 531 and the perforated partition 532 are arranged at the inlet of the high-dryness heat exchange pipe 523 and the low-dryness adjusting heat exchange pipe 524 in a matching way; the imperforate partition 531 is located above the perforated partition 532, and a draft tube 533 is further disposed on the opening of the perforated partition 532.

Further, the low-dryness conditioning heat exchange tubes 524 have inlets inserted into the header 522 and have lengths longer than the 2/3 diameter of the header 522.

Further, the pressurized working medium discharged from the diffuser pipe 51 is partially adjusted in dryness in the evaporation process through the air-adjusting inner pipe 54, and partially enters the ejector 8 as an injection fluid, and the rest enters the primary compressor 1.

The working principle of the two-stage compression adjustable dryness refrigerating system with the ejector is explained in detail as follows:

gaseous working media are discharged from a primary compressor 1 of the system, enter a secondary compressor 2 after being mixed and cooled in the middle, then enter a condenser heat exchange tube 32 from an inlet 31 of a dryness-adjustable condenser device 3 for heat exchange, after heat exchange of one tube pass, two-phase working media enter a dryness adjustment header 33, then enter an inner tube 334 of the dryness adjustment device 333 for gas-liquid separation dryness adjustment, liquid working media are discharged to an outer tube 3331 through inner tube small holes 335 on the convex side tube wall of the inner tube 334 under the action of centrifugal force, then the gaseous working media continuously enter a subsequent tube pass for high-efficiency condensation, and the liquid working media in the outer tube 3331 are continuously discharged into the outer tube 3331 of the subsequent dryness adjustment device 333 through a liquid discharge connecting tube 336. The subsequent tube passes are continuously repeated until the last tube pass, the liquid-phase working medium of the outer tube 3331 is mixed with the working medium in the heat exchange tube 32 and then discharged from the outlet tube 34 of the condenser, and the working medium maintains high-dryness efficient heat exchange in the condenser. The condensed working medium is throttled by the throttle valve 4 and enters the dryness-adjustable evaporator device 5.

After passing through the throttle valve 4, the working medium enters the header 522 from the inlet 521 of the adjustable dryness evaporator 52, then is subjected to high and low dryness separation through the perforated partition 532, the high dryness fluid enters the high dryness heat exchange tube 523 for heat exchange, and the low dryness fluid enters the low dryness heat exchange tube 524 for heat exchange; the working medium after heat exchange is discharged from an outlet 525 of the adjustable dryness evaporator 52, enters a diffuser pipe 51 for pressurization until the pressure is higher than the pressure of an inlet 521 of the adjustable dryness evaporator 52, then the pressurized partial superheated gaseous working medium enters an air-conditioning inner pipe 54 and enters a low-dryness heat exchange pipe 524 through an air-conditioning inner pipe small hole 541 cut in the pipe wall, the working medium dryness of the low-dryness heat exchange pipe 524 is adjusted to be in a high-dryness heat exchange flow state, and the evaporation heat exchange efficiency is enhanced; and then, the residual part of the pressurized gaseous working medium is used as injection fluid of the injection module, and finally, the residual pressurized gaseous working medium is continuously discharged from the delivery pipe and enters the compressor 1 to continue the refrigeration cycle process.

The injection fluid of the injection module is extracted from a gaseous working medium bypass port 35 of the dryness adjustable condenser device 3 to be partially saturated gaseous working medium, the flow is controlled through an electronic valve 6, the extracted gaseous working medium enters a gas-liquid separator I7 for gas-liquid separation, then enters an injector 8, at the moment, part of pressurized gaseous working medium discharged from a diffuser pipe 51 of the dryness adjustable evaporator device 5 is extracted to be used as injection fluid, the injection fluid is mixed with the injection fluid and then enters a gas-liquid separator II 9 for gas-liquid separation, and finally, the low-temperature gaseous working medium is mixed with high-temperature exhaust gas of the primary compressor 1 and is cooled and then enters the secondary compressor 2 for continuous compression; and the liquid phase working medium of the gas-liquid separator I7 and the liquid phase working medium of the gas-liquid separator II 9 are discharged to the inlet of the throttle valve 4 to be mixed with the main cycle working medium of the system for throttling.

Fig. 4 is a pressure-enthalpy diagram of the two-stage compression adjustable dryness refrigerating system with the ejector, wherein the main refrigerating cycle process is as follows: 1 → 2 → 3 → 4 → 5 → 6 → 7 → 1 cycle; the temperature rise process after the working medium of the ejector and the exhaust gas of the primary compressor 1 are mixed is as follows: (4' → O +1 → O) → 3; the exhaust cooling process of the primary compressor 1 is as follows: 2 → 3.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are intended to illustrate the principles of the invention, and that various changes and modifications may be made without departing from the spirit and scope of the invention, and the scope of the invention is to be protected. The scope of the invention is defined by the appended claims and equivalents thereof.

Also, the drawings are for illustrative purposes only and are presented as schematic illustrations only, not as physical illustrations, and are not to be construed as limiting the present patent; for a better understanding of the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.

Moreover, like or similar reference numerals in the drawings of the embodiments of the present invention correspond to like or similar parts; in the description of the present invention, it should be understood that, if there are any terms such as "upper", "lower", "left", "right", "vertical", "horizontal", "longitudinal", "top", "bottom", "inner", "outer", etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the drawings, the description is for convenience and simplicity, and it is not intended to indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore, the terms describing the positional relationships in the drawings are used for illustrative purposes only and are not to be construed as limiting the present patent.

Claims

1. The utility model provides a take adjustable quality refrigerating system of doublestage compression of sprayer, includes refrigeration main loop and sprays the module, its characterized in that: the refrigeration main circulation comprises a primary compressor (1), a secondary compressor (2), a dryness adjustable condenser device (3), a throttle valve (4) and a dryness adjustable evaporator device (5) which are sequentially communicated with each other at the inlet and the outlet; the injection module comprises an electronic valve (6), a gas-liquid separator I (7), an ejector (8) and a gas-liquid separator II (9), wherein an inlet of the electronic valve (6) is communicated with an outlet of the dryness-adjustable condenser device (3), an outlet of the electronic valve (6) is communicated with an inlet of the gas-liquid separator I (7), an outlet of the gas-liquid separator I (7) is respectively communicated with an outlet of the dryness-adjustable condenser device (3), an inlet of the throttle valve (4) and one inlet of the ejector (8), the other inlet of the ejector (8) is respectively communicated with an outlet of the dryness-adjustable evaporator device (5) and an inlet of the primary compressor (1), an outlet of the ejector (8) is communicated with an inlet of the gas-liquid separator II (9), and an outlet of the gas-liquid separator II (9) is respectively communicated with an outlet of the gas-liquid separator I (7), The outlet of the dryness adjustable condenser device (3), the inlet of the throttle valve (4), the outlet of the primary compressor (1) and the inlet of the secondary compressor (2) are communicated.

2. The dual stage compression variable dryness refrigeration system with ejector of claim 1, wherein: the dryness-adjustable condenser device (3) comprises a heat exchange tube (32) and a dryness adjusting header (33); two dryness adjusting headers (33) are arranged, connecting pipes (331) are respectively arranged on the two dryness adjusting headers (33), and two ends of the heat exchange pipe (32) are respectively communicated with the two connecting pipes (331); the two connecting pipes (331) are provided with a plurality of built-in sealing partition plates (332) at the same horizontal height position, and the two connecting pipes (331) are divided into a plurality of heat exchange tube passes through the built-in sealing partition plates (332).

3. The dual stage compression variable dryness refrigeration system with ejector of claim 2, wherein: the side part of the connecting pipe (331) is also provided with a plurality of dryness adjusting devices (333), the dryness adjusting devices (333) are convex semicircular sleeves, the dryness adjusting devices (333) are respectively communicated with the connecting pipe (331) at the upper side and the lower side of the built-in sealing partition plate (332), and a liquid drainage connecting pipe (336) is also arranged between the convex sides of two adjacent dryness adjusting devices (333) at the same side and is communicated with the convex sides through the liquid drainage connecting pipe (336); and the outlets of the two connecting pipes (331) are also respectively provided with a gaseous working medium bypass port (35).

4. The dual stage compression variable dryness refrigeration system with ejector of claim 3, wherein: one of the two connecting pipes (331) is also provided with an inlet (31) and an outlet (34); the dryness adjusting device (333) comprises an outer pipe (3331) and an inner pipe (334) arranged in the outer pipe (3331), and a plurality of inner pipe small holes (335) are drilled on the convex side of the inner pipe (334).

5. The dual stage compression variable dryness refrigeration system with ejector of claim 4, wherein: the dryness adjustable evaporator device (5) comprises an adjustable dryness evaporator (52), a diffuser pipe (51) and an air adjusting inner pipe (54); the evaporator outlet (525) of the dryness-adjustable evaporator (52) is communicated with the inlet of the diffuser pipe (51), and the outlet of the diffuser pipe (51) is communicated with the air-adjusting inner pipe (54).

6. The dual stage compression variable dryness refrigeration system with ejector of claim 5, wherein: the adjustable dryness evaporator (52) comprises a high dryness heat exchange pipe (523), a low dryness adjusting heat exchange pipe (524) and a header (522); the two headers (522) are arranged, and the two ends of the high-dryness heat exchange tube (523) and the two ends of the low-dryness adjusting heat exchange tube (524) are respectively communicated with the two headers (522).

7. The dual stage compression variable dryness refrigeration system with ejector of claim 6, wherein: the air-conditioning inner pipe (54) is provided with a plurality of air-conditioning inner pipe small holes (541) along the axial direction, and the air-conditioning inner pipe (54) is parallelly inserted on the low-dryness conditioning heat exchange pipe (524) and forms a sleeve structure.

8. The dual stage compression variable dryness refrigeration system with ejector of claim 7, wherein: the header (522) is provided with a paired imperforate partition (531) and an apertured partition (532); wherein, the imperforate partition (531) and the perforated partition (532) are arranged at the inlet of the high-dryness heat exchange pipe (523) and the low-dryness adjusting heat exchange pipe (524) in a matching way; the imperforate partition plate (531) is positioned above the perforated partition plate (532), and a draft tube (533) is further arranged on the opening of the perforated partition plate (532).

9. The dual stage compression variable dryness refrigeration system with ejector of claim 7, wherein: the inlet of the low-dryness adjusting heat exchange tube (524) is inserted into the header (522) and the inserted length of the low-dryness adjusting heat exchange tube is greater than the 2/3 diameter of the header (522).

10. The dual stage compression variable dryness refrigeration system with ejector of claim 5, wherein: the dryness of the evaporation process is adjusted by a part of the pressurized working medium discharged from the diffuser pipe (51) through the air adjusting inner pipe (54), a part of the pressurized working medium enters the ejector (8) as an injection fluid, and the rest of the pressurized working medium enters the primary compressor (1).