阅读说明：本技术 冷凝分离式超音速引射器的二氧化碳制冷系统及制冷机 (Carbon dioxide refrigerating system and refrigerator of condensation separation type supersonic ejector ) 是由 曾钰培 罗二仓 陈燕燕 王晓涛 董学强 公茂琼 朱顺敏 余国瑶 于 2021-04-30 设计创作，主要内容包括：本发明提供一种冷凝分离式超音速引射器的二氧化碳制冷系统及制冷机,该冷凝分离式超音速引射器的二氧化碳制冷系统包括冷凝分离式超音速引射器、第一流通管路和第二流通管路,冷凝分离式超音速引射器,设有引射管,冷凝分离式超音速引射器包括进口侧、出气侧和出液侧；第一流通管路两端分别连接引射管与出气侧；第二流通管路两端分别连接出液侧和进口侧；其中,第一流通管路和第二流通管路中的一者或者两者均设有蒸发器。通过上述方式,本发明可以通过第一流通管路和第二流通管路中的任一者或者两者同时提取制冷量,由此该制冷系统提取冷量灵活性更强且具有占用空间小、膨胀制冷效率高、工质环保安全的优点。(The invention provides a carbon dioxide refrigerating system of a condensation separation type supersonic ejector and a refrigerator, wherein the carbon dioxide refrigerating system of the condensation separation type supersonic ejector comprises a condensation separation type supersonic ejector, a first flow pipeline and a second flow pipeline; two ends of the first circulation pipeline are respectively connected with the injection pipe and the gas outlet side; two ends of the second flow pipeline are respectively connected with the liquid outlet side and the inlet side; wherein, one or both of the first circulation pipeline and the second circulation pipeline are provided with evaporators. Through the mode, the refrigeration system can extract refrigeration capacity through either one or both of the first circulation pipeline and the second circulation pipeline, so that the refrigeration system has stronger flexibility in extracting refrigeration capacity and has the advantages of small occupied space, high expansion refrigeration efficiency and environment-friendly and safe working medium.)

1. A carbon dioxide refrigeration system of a condensation separation type supersonic ejector is characterized by comprising:

the condensation separation type supersonic ejector is provided with an ejector pipe and comprises an inlet side, an air outlet side and an liquid outlet side;

the two ends of the first circulation pipeline are respectively connected with the injection pipe and the gas outlet side;

a second circulation pipeline, both ends of which are respectively connected with the liquid outlet side and the inlet side; wherein the content of the first and second substances,

one or both of the first and second flow lines is provided with an evaporator.

2. The carbon dioxide refrigeration system of the condensation-separation type supersonic ejector according to claim 1, wherein a throttle valve and a first evaporator are arranged on the first flow pipeline; the inlet end of the throttling valve is communicated with the air outlet side, the outlet end of the throttling valve is communicated with the inlet end of the first evaporator, and the outlet end of the first evaporator is communicated with the injection pipe.

3. The carbon dioxide refrigeration system of the condensing-separating supersonic ejector according to claim 2, wherein a second evaporator, a compressor and a gas cooler are arranged on the second flow path;

the inlet end of the second evaporator is communicated with the liquid outlet side, the outlet end of the second evaporator is communicated with the inlet end of the compressor, the outlet end of the compressor is communicated with the inlet end of the gas cooler, and the outlet end of the gas cooler is communicated with the inlet side.

4. The carbon dioxide refrigeration system of the condensation-separation type supersonic ejector according to claim 2, wherein a circulating pump is disposed on the second flow passage, an inlet end of the circulating pump is communicated with the liquid outlet side, and an outlet end of the circulating pump is communicated with the inlet side.

5. The carbon dioxide refrigeration system of the condensation-separation type supersonic ejector according to claim 3, wherein the working medium from the second flow pipeline to the inlet side is in a gaseous state.

6. The carbon dioxide refrigeration system of the condensing-separating supersonic ejector according to claim 4, wherein the working medium from the second flow line to the inlet side is in a liquid state.

7. The carbon dioxide refrigeration system of the condensation-separation type supersonic ejector according to claim 1, wherein the condensation-separation type supersonic ejector comprises a cyclone mechanism, a spray pipe, a cyclone separation pipe, a liquid discharge mechanism and a diffuser which are connected in sequence;

the inlet side is communicated with the cyclone mechanism, the cyclone mechanism generates centrifugal force to enable the working medium entering through the inlet side to form a low-temperature effect in the spray pipe, and the generated liquid working medium flows to the second circulation pipeline through the liquid discharge mechanism in the cyclone separation pipe and flows to the first circulation pipeline through the diffuser.

8. The carbon dioxide refrigeration system of a condensing supersonic ejector according to claim 7, wherein said ejector tube is in communication with said jet tube.

9. The carbon dioxide refrigeration system of the condensation-separation supersonic ejector according to claim 1, wherein the working medium used in the condensation-separation supersonic ejector is carbon dioxide.

10. A refrigerator comprising a supersonic two-phase expansion multi-stage cryogenic refrigeration system according to any one of claims 1 to 9.

Technical Field

The invention relates to the technical field of refrigeration, in particular to a carbon dioxide refrigeration system of a condensation separation type supersonic ejector and a refrigerator.

Background

The traditional injection refrigeration system has low efficiency, and has the problems of complex structure, insufficient gas-liquid separation and the like caused by a gas-liquid separator; the refrigerant ODP and GWP of the traditional vapor compression refrigeration system are high, some refrigerants have certain flammability and toxicity, and once the refrigerant leaks, certain potential safety hazards, ozone layer damage, greenhouse effect and other environmental problems are easily caused.

The low temperature and refrigeration technology improves the life quality of people, meanwhile, various refrigerant leakage also brings environmental problems, and the popularization and application of the environment-friendly refrigerant are important subjects of social development. The refrigerant development history is mainly divided into four stages: first generation refrigerant with natural working substance such as CO₂Ethers, etc.; with the development of artificially synthesized second generation refrigerants, namely chlorofluorocarbons (CFCs) and Hydrochlorofluorocarbons (HCFCs), natural working media are gradually eliminated because the system efficiency cannot be compared with that of artificially synthesized working media, but the second generation refrigerants have higher Ozone Depletion Potential (ODP) and also leave the history stage; for the protection of the ozone layer, refrigerants are converted into Hydrofluorocarbons (HFCs) containing no chlorine and bromine, wherein the third generation refrigerants, mainly represented by R134a, are beginning to be produced and used on a large scale, but have high Global Warming Potential (GWP), which brings with it the problem of greenhouse effect; in view of ozone depletion and greenhouse effect, natural working substances have been proposed again as fourth generation refrigerants, mainly comprising CO₂、NH₃、H₂O, hydrocarbons and CH for cryogenic refrigeration₄、N₂He, etc., to CO₂The typical natural working medium refrigeration technology becomes a new round of research hotspot.

Disclosure of Invention

The embodiment of the invention provides a carbon dioxide refrigerating system of a condensation separation type supersonic ejector and a refrigerator, which are used for solving the technical problems of low efficiency, complex structure and insufficient gas-liquid separation caused by a gas-liquid separator of a traditional ejection refrigerating system in the prior art.

The embodiment of the invention provides a carbon dioxide refrigerating system of a condensation separation type supersonic ejector, which comprises: the condensation separation type supersonic ejector is provided with an ejector pipe and comprises an inlet side, an air outlet side and an liquid outlet side;

the two ends of the first circulation pipeline are respectively connected with the injection pipe and the gas outlet side;

a second circulation pipeline, both ends of which are respectively connected with the liquid outlet side and the inlet side; wherein the content of the first and second substances,

one or both of the first and second flow lines is provided with an evaporator.

According to the carbon dioxide refrigeration system of the condensation separation type supersonic ejector, a throttle valve and a first evaporator are arranged on the first flow pipeline; the inlet end of the throttling valve is communicated with the air outlet side, the outlet end of the throttling valve is communicated with the inlet end of the first evaporator, and the outlet end of the first evaporator is communicated with the injection pipe.

According to the carbon dioxide refrigeration system of the condensation separation type supersonic ejector, a second evaporator, a compressor and a gas cooler are arranged on the second flow pipeline;

the inlet end of the second evaporator is communicated with the liquid outlet side, the outlet end of the second evaporator is communicated with the inlet end of the compressor, the outlet end of the compressor is communicated with the inlet end of the gas cooler, and the outlet end of the gas cooler is communicated with the inlet side.

According to the carbon dioxide refrigeration system of the condensation separation type supersonic ejector, a circulating pump is arranged on the second flow pipeline, the inlet end of the circulating pump is communicated with the liquid outlet side, and the outlet end of the circulating pump is communicated with the inlet side.

According to the carbon dioxide refrigeration system of the condensation separation type supersonic ejector, the working medium from the second flow pipeline to the inlet side is in a gaseous state.

According to the carbon dioxide refrigeration system of the condensation separation type supersonic ejector, the working medium from the second flow pipeline to the inlet side is in a liquid state.

According to the carbon dioxide refrigeration system of the condensation separation type supersonic ejector, the condensation separation type supersonic ejector comprises a cyclone mechanism, a spray pipe, a cyclone separation pipe, a liquid discharge mechanism and a diffuser which are sequentially connected;

the inlet side is communicated with the cyclone mechanism, the cyclone mechanism generates centrifugal force to enable the working medium entering through the inlet side to form a low-temperature effect in the spray pipe, and the generated liquid working medium flows to the second circulation pipeline through the liquid discharge mechanism in the cyclone separation pipe and flows to the first circulation pipeline through the diffuser.

According to the carbon dioxide refrigeration system of the condensation separation type supersonic ejector, the ejector pipe is communicated with the spray pipe.

According to the carbon dioxide refrigeration system of the condensation separation type supersonic ejector, the working medium adopted in the condensation separation type supersonic ejector is carbon dioxide.

An embodiment of the present invention further provides a refrigerator, including: the supersonic two-phase expansion multi-stage low-temperature refrigeration system.

The embodiment of the invention provides a carbon dioxide refrigeration system and a refrigerator of a condensation separation type supersonic ejector, wherein the carbon dioxide refrigeration system of the condensation separation type supersonic ejector comprises the condensation separation type supersonic ejector and a first circulation pipeline and a second circulation pipeline which are connected with the condensation separation type supersonic ejector, and one or both of the first circulation pipeline and the second circulation pipeline is/are provided with an evaporator, so that refrigeration quantity can be extracted through either one or both of the first circulation pipeline and the second circulation pipeline, and the refrigeration system has the advantages of stronger refrigeration quantity extraction flexibility, small occupied space, high expansion refrigeration efficiency and environment-friendly and safe working medium.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.

FIG. 1 is a schematic diagram of an embodiment of a carbon dioxide refrigeration system of a condensation separation type supersonic ejector according to the present invention;

FIG. 2 is a schematic diagram of a second embodiment of a condensing-separating supersonic ejector carbon dioxide refrigeration system according to the present invention;

FIG. 3 is a schematic diagram of a third embodiment of a condensing-separating supersonic ejector carbon dioxide refrigeration system according to the present invention;

FIG. 4 is a schematic diagram of the condensing-separating supersonic ejector of FIG. 1;

reference numerals:

10. a condensing separation type supersonic ejector; 110. an injection pipe; 120. an inlet side; 130. a gas outlet side; 140. a liquid outlet side; 150. a swirling mechanism; 160. a nozzle; 170. a liquid discharge mechanism; 180. A diffuser; 190. a cyclone separation tube;

20. a first flow line; 210. a throttle valve; 220. a first evaporator;

30. a second flow line; 310. a second evaporator; 320. a compressor; 330. a gas cooler; 340. and a circulating pump.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the embodiments of the present invention and simplifying the description, but do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the embodiments of the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Referring to fig. 1 to 4, the present invention provides a refrigerator, which may be an industrial refrigerator or a domestic refrigeration device, such as a supermarket, a refrigeration system of a cold store, and the like, without limitation. The refrigerating machine comprises a carbon dioxide refrigerating system of the condensation separation type supersonic ejector, and the system can extract cold energy to cool and refrigerate the external environment.

Referring to fig. 1, in an embodiment of the present invention, a carbon dioxide refrigeration system of a condensation-separation type supersonic ejector includes a condensation-separation type supersonic ejector 10, a first flow-through pipeline 20 and a second flow-through pipeline 30, the condensation-separation type supersonic ejector 10 is provided with an ejector pipe 110, and the condensation-separation type supersonic ejector 10 includes an inlet side 120, an outlet side 130 and an outlet side 140; two ends of the first circulation pipeline 20 are respectively connected with the injection pipe 110 and the air outlet side 130; the two ends of the second circulation pipeline 30 are respectively connected with the liquid outlet side 140 and the inlet side 120; wherein one or both of the first and second flow-through passages 20 and 30 are provided with an evaporator.

That is, in the process of extracting the cold, the present invention may extract through the first circulation line 20, may extract through the second circulation line 30, or extract through both the first circulation line 20 and the second circulation line 30. Because first flow-through channel 20 is connected to liquid outlet side 130, second flow-through channel 30 is connected to liquid outlet side 140. Therefore, the cold energy of the working medium flowing out of the gas outlet side 130 can be extracted through the evaporator, and the cold energy of the working medium flowing out of the liquid outlet side 140 can also be extracted through the evaporator, so that the path for extracting the cold energy can be controlled, the overall layout of the system is more flexible, the space adjustment adaptability is strong, and the cold energy can be extracted from the first circulation pipeline 20 or the second circulation pipeline 30 as required.

In an embodiment of the present invention, the refrigeration capacity can be extracted through the first circulation pipeline 20 and the second circulation pipeline 30 respectively, and the refrigeration capacity obtained by this embodiment is more, and specifically, refer to the embodiment shown in fig. 1. The first circulation pipeline 20 is provided with a throttle valve 210 and a first evaporator 220, an inlet end of the throttle valve 210 is communicated with the air outlet side 130, an outlet end of the throttle valve 210 is communicated with an inlet end of the first evaporator 220, and an outlet end of the first evaporator 220 is communicated with the injection pipe 110. The second circulation line 30 is provided with a second evaporator 310, a compressor 320 and a gas cooler 330, an inlet end of the second evaporator 310 is communicated with the liquid outlet side 140, an outlet end of the second evaporator 310 is communicated with an inlet end of the compressor 320, an outlet end of the compressor 320 is communicated with an inlet end of the gas cooler 330, and an outlet end of the gas cooler 330 is communicated with the inlet side 120. I.e. cold can be extracted by the first evaporator 220 and the second evaporator 310, and because the cold extraction is performed by both evaporators at the same time, more cold is always available to be extracted.

In other embodiments, it is also possible to extract the cold only via the first or second flow duct 20, 30. Referring to fig. 3, when cold is extracted through the first circulation line 20, the first circulation line 20 may be provided with a throttle valve 210 and a first evaporator 220, and the second circulation line 30 is provided with a circulation pump 340, so that cold is extracted through the first evaporator 220. In this embodiment, the amount of cold extracted by the first evaporator 220 is less than the amount of cold obtained by both the first evaporator 220 and the second evaporator 310, but the working fluid passing through the second flow line 30 to the condensing split supersonic ejector 10 is in a liquid state, thereby facilitating more cold to be obtained by the first flow line 20.

The following can be obtained by bernoulli's equation:

from the above, the density of the liquid working medium is greater than that of the gaseous working medium, and at the same speed, a greater pressure change can be obtained, so that the ejection effect of the condensation separation type supersonic ejector 10 can be improved. That is, when entering the condensing-separating supersonic ejector 10 through the inlet side 120, at the same speed, the pressure inside the condensing-separating supersonic ejector 10 corresponding to the gaseous working medium is greater, and the pressure inside the condensing-separating supersonic ejector 10 is made smaller by the liquid working medium, thereby facilitating an increase in the rate of transmission into the condensing-separating supersonic ejector 10 through the first evaporator 220. And then in unit time, the heat exchange efficiency of the first evaporator 220 is higher, and the cold quantity obtained in unit time is more.

Referring to fig. 2, when the second circulation pipeline 30 is used to obtain cooling capacity, a second evaporator 310, a compressor 320 and a gas cooler 330 may be disposed on the second circulation pipeline 30, an inlet end of the second evaporator 310 is connected to the liquid outlet side 140, an outlet end of the second evaporator 310 is connected to an inlet end of the compressor 320, an outlet end of the compressor 320 is connected to an inlet end of the gas cooler 330, and an outlet end of the gas cooler 330 is connected to an inlet end. The first flow conduit 20 may be configured without any components, such that the gas outlet side 130 of the condensation-separation supersonic ejector 10 passes directly through the ejector tube 110 into the condensation-separation supersonic ejector 10. Because the gaseous working medium generated at the gas outlet side 130 is directly transmitted into the condensation separation type supersonic ejector 10, no pressure loss exists in the process, the ejection effect of the condensation separation type supersonic ejector 10 is improved, the condensation separation type supersonic ejector 10 can generate more liquid working mediums conveniently, the operation of the second circulation pipeline 30 is promoted, and more refrigerating capacity can be obtained through the second evaporator 310 in unit time.

Referring to fig. 4, in an embodiment of the present invention, the condensation-separation type supersonic ejector 10 includes a cyclone mechanism 150, a nozzle 160, a cyclone separation tube 190, a liquid discharge mechanism 170, and a diffuser 180, which are connected in sequence; the inlet side 120 is communicated with the cyclone mechanism 150, the cyclone mechanism 150 generates centrifugal force to enable the working medium entering through the inlet side 120 to form low-temperature effect in the nozzle 160, and the generated liquid working medium flows to the second flow pipeline 30 through the liquid discharge mechanism 170 in the cyclone separation pipe 190 and flows to the first flow pipeline 20 through the diffuser 180. Specifically, the ejector tube 110 is communicated with the nozzle 160, so that the working medium introduced through the ejector tube 110 can be directly transmitted to the nozzle 160 to participate in the low-temperature effect of the nozzle 160.

In an embodiment of the invention, carbon dioxide is used as a refrigerant, during a refrigeration process, carbon dioxide refrigerant gas enters the condensation separation type supersonic ejector 10, centrifugal force is generated in the cyclone mechanism 150 by the gas, the gas is subjected to medium entropy expansion, temperature reduction and pressure reduction in the spray pipe 160 to generate a refrigeration effect, a part of carbon dioxide gas after the temperature reduction is subjected to condensation nucleation to generate liquid drops and further grow in the cyclone separation pipe 190, a liquid phase is discharged through the liquid discharge mechanism 170 due to tangential velocity and centrifugal effect generated by rotation, and residual gas-phase carbon dioxide is discharged after being subjected to speed reduction, temperature rise and pressure rise through the diffuser 180, so that most of pressure can be recovered, and pressure loss of an inlet and an outlet is greatly reduced.

In the second flow path 30, the liquid working medium discharged from the liquid discharge mechanism 170 passes through the second evaporator 310, is evaporated at equal temperature and pressure in the second evaporator 310 to generate refrigeration, enters the compressor 320 to be compressed and pressurized, is cooled by the gas cooler 330, and returns to the condensation separation type supersonic ejector 10 again to complete the circulation of the second flow path 30. The gas cooler 330 functions to cool the high temperature gaseous working medium to the same temperature as the inlet side 120, i.e., to meet the inlet temperature value set by the condensing-separating supersonic ejector 10.

In the first circulation pipeline 20, the residual gas phase discharged by the diffuser 180 is throttled, cooled and depressurized by the throttle valve 210 and then is subjected to isothermal and isobaric evaporation in the first evaporator 220 to generate refrigeration, and because the gas phase pressure of the first evaporator 220 is greater than the pressure in the nozzle 160, the gas phase passing through the first evaporator 220 is injected into the nozzle 160 through the injection pipe 110 and participates in the refrigeration effect in the nozzle 160 again, so that the condensation and liquefaction processes are performed, and the circulation of the first circulation pipeline 20 is completed. The gas phase discharged through the diffuser 180 is re-injected into the nozzle 160, so that on one hand, the cold energy of the gas working medium can be taken out to generate the refrigeration effect. On the other hand, the amount of the gas entering the condensation separation type supersonic ejector 10 is increased, so that the liquid phase separation rate can be improved, and the efficiency of the refrigeration system is greatly improved.

In an embodiment of the present invention, the working medium used in the condensation separation type supersonic ejector 10 is carbon dioxide. In other embodiments, other environment-friendly, safe and reliable natural working media such as nitrogen, argon, neon, helium and the like can be adopted according to application requirements, and the combination and proportion of different working media can also be used as circulating working media to realize high-efficiency refrigeration.

To sum up, the carbon dioxide refrigeration system of the condensation separation type supersonic ejector provided by the embodiment of the present invention includes the condensation separation type supersonic ejector 10, and the first circulation pipeline 20 and the second circulation pipeline 30 connected to the condensation separation type supersonic ejector 10, and one or both of the first circulation pipeline 20 and the second circulation pipeline 30 are provided with an evaporator, so that the refrigeration capacity can be extracted through either one or both of the first circulation pipeline 20 and the second circulation pipeline 30, and thus the refrigeration system has the advantages of strong flexibility of cold extraction, small occupied space, high expansion refrigeration efficiency, and environment-friendly and safe working medium.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of an embodiment of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.