Refrigerating system of low-temperature scroll compressor

Abstract

The invention discloses a refrigerating system of a low-temperature scroll compressor, and relates to the technical field of refrigerating systems, in particular to a refrigerating system of a scroll compressor with a liquid spraying or air supply function increasing structure. The refrigerating system of the low-temperature scroll compressor is a freezing and cold storage refrigerating system and comprises a compressor, a condenser, a liquid storage device, a drying filter, a three-way pipeline, a liquid pipe liquid viewing mirror, a throttling device, an evaporator and a gas-liquid separator which are connected in sequence. The inlet end of the capillary tube is communicated with the outlet end of the three-way pipeline, and the outlet end is communicated with the inlet end of the electromagnetic valve; and the outlet end of the electromagnetic valve is communicated with a liquid spraying / air supplementing opening of the compressor through a pipeline. According to the technical scheme, the problems that in the prior art, a form of spraying liquid into a medium-pressure cavity of the scroll compressor is adopted, and the system COP is poor; an economizer air injection mode is adopted, manufacturing cost is high, market acceptability is low, and popularization is difficult. And a mixed refrigerant form is adopted, so that the safety is poor, and the environment-friendly performance is poor.

Description

Technical Field

[0001] The invention discloses a refrigeration system of a low-temperature scroll compressor, which relates to the technical field of refrigeration systems, and in particular to a refrigeration system of a scroll compressor with a liquid injection or air supplement function structure. Background Art

[0002] At present, low-temperature refrigeration technology has a wide range of application scenarios. It is completed by alternating the two processes of condensation and evaporation of the refrigerant. By controlling the exhaust temperature of the scroll compressor, a lower refrigeration temperature can be achieved, broadening the scope of application, replacing the traditional methods of liquid injection and air replenishment and the use of mixed refrigerant refrigeration. It is widely used in low-temperature freezing storage of food and biomaterials, low-temperature liquefaction and separation of gases (such as air separation industry, aerospace applications), low-temperature industrial cold water, superconducting applications, cooling of infrared detection devices, semiconductor industry, low-temperature biomedicine and other fields.

[0003] However, the existing technology still has some shortcomings: First, the liquid refrigerant is sprayed into the medium-pressure chamber of the scroll compressor (i.e., liquid injection), which sacrifices the cooling capacity of the refrigeration system and results in a poor COP of the system. Second, the gaseous refrigerant is sprayed into the medium-pressure chamber of the scroll compressor (i.e., jet), which requires the addition of system accessories such as economizers, expansion valves, and solenoid valves. The system is cumbersome and too expensive, with low market acceptance and difficulty in promotion. Third, although the low-temperature system using mixed refrigerant can achieve lower temperatures, the safety of the mixed refrigerant is uncertain. Currently, the relevant functional departments have not given regulatory evaluations and approvals, and the environmental performance is also uncertain.

[0004] In view of the problems existing in the above-mentioned prior art, it is very necessary to study and design a new type of low-temperature scroll compressor refrigeration system to overcome the problems existing in the prior art. Summary of the invention

[0005] According to the above-mentioned prior art, a refrigeration system of a low-temperature scroll compressor is provided, in view of the technical problems that the system COP is poor when liquid is sprayed into the medium-pressure chamber of the scroll compressor; the cost is high, the market acceptance is low, and it is difficult to promote when the economizer jet is adopted; and the safety and environmental protection are poor when the mixed refrigerant is adopted.

[0006] The technical means adopted by the present invention are as follows:

[0007] A refrigeration system of a low-temperature scroll compressor is a freezing and refrigeration system, comprising a compressor, a condenser, a liquid storage device, a drying filter, a three-way pipeline, a liquid pipe sight glass, a throttling device, an evaporator and a gas-liquid separator connected in sequence;

[0008] Furthermore, a gaseous refrigerant circuit is provided between the outlet end of the three-way pipeline and the liquid injection / gas replenishment port of the compressor.

[0009] Further, the gaseous refrigerant circuit includes: a capillary tube, a solenoid valve and a connecting pipeline;

[0010] Further, the inlet end of the capillary tube is connected to the outlet end of the three-way pipeline, and the outlet end is connected to the inlet end of the solenoid valve;

[0011] Furthermore, the outlet end of the solenoid valve is connected to the liquid injection / air supply port of the compressor through a pipeline.

[0012] Furthermore, the capillary tube passes through the high-temperature and high-pressure liquid pipeline in the system. When the high-temperature and high-pressure liquid refrigerant flows through the capillary tube, it is affected by the wall resistance of the capillary tube, thereby achieving the effect of lowering the refrigerant temperature. The low-temperature liquid refrigerant in the capillary tube can evaporate and vaporize after absorbing the heat of the high-temperature liquid refrigerant in the system pipeline, and is sprayed into the cavity of the scroll compressor through the solenoid valve, thereby achieving the effect of lowering the exhaust temperature of the scroll compressor.

[0013] Furthermore, the solenoid valve ensures the function of opening when the compressor exhaust temperature is too high and closing when the compressor exhaust temperature is too low.

[0014] Furthermore, the compressor is a scroll compressor with a liquid injection or air supplement structure.

[0015] Furthermore, a drying filter is arranged at the front end of the three-way pipeline to prevent dirt in the system from clogging the capillary tube.

[0016] Furthermore, the refrigerant filled in the refrigeration system of the ultra-low temperature scroll compressor is a HCFC / HFC / HFO type refrigerant;

[0017] Furthermore, HCFC / HFC / HFO refrigerants include: R22, R404A, R507C, R448A, R449A, and R455A.

[0018] Compared with the prior art, the present invention has the following advantages:

[0019] 1. Compared with the existing method of spraying liquid refrigerant (i.e., liquid spray) into the medium-pressure chamber of the scroll compressor, the refrigeration system of the low-temperature scroll compressor provided by the present invention has a simple structure, lower cost, improved energy efficiency, and meets the development needs of the industry;

[0020] 2. The refrigeration system of the low-temperature scroll compressor provided by the present invention reduces system components, greatly reduces costs, and improves system reliability compared to the existing method of using an economizer to spray gaseous refrigerant into the medium-pressure chamber of the scroll compressor (i.e., jet).

[0021] 3. The refrigeration system of the low-temperature scroll compressor provided by the present invention adopts the capillary heat exchange jet method. Compared with the liquid spray and air supply structure, it has the advantages of simple structure, low price, high reliability, etc., and has higher market acceptance.

[0022] In summary, the technical solution of the present invention solves the problems in the prior art of using liquid spray into the medium-pressure chamber of the scroll compressor, which results in a poor system COP and cannot meet the goal of carbon neutrality; using economizer jet injection, which has high cost, low market acceptance and is difficult to promote; and using a mixed refrigerant, which has poor safety and environmental protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0024] Figure 1 Schematic diagram of the system of the present invention.

[0025] In the figure: 1, compressor 2, condenser 3, liquid storage tank 4, filter drier 5, three-way pipe 6, capillary tube 7, liquid pipe sight glass 8, throttling device 9, evaporator 10, gas-liquid separator 11, solenoid valve. DETAILED DESCRIPTION

[0026] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0027] In order to make the purpose, 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 in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0029] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps described in these embodiments do not limit the scope of the present invention. At the same time, it should be clear that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0030] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention: the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0031] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below their position devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0032] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0033] like Figure 1As shown, the present invention provides a refrigeration system of a low-temperature scroll compressor as a freezing and refrigerating refrigeration system, comprising a compressor 1, a condenser 2, a liquid storage device 3, a drying filter 4, a three-way pipeline 5, a liquid pipe sight glass 7, a throttling device 8, an evaporator 9 and a gas-liquid separator 10 connected in sequence to form a refrigeration system;

[0034] The outlet a of the three-way pipe 5 is connected to the inlet b of the capillary tube 6, the outlet c of the capillary tube 6 is connected to the inlet d of the electromagnetic valve 11, and the outlet e of the electromagnetic valve 11 is connected to the air supply inlet f of the compressor 1, forming a gas refrigerant circuit;

[0035] The refrigerant is HCFC / HFC / HFO type refrigerant.

[0036] In addition to being used in low-temperature cold storage, the refrigeration cycle system can also be used in low-temperature environmental test chambers, low-temperature oil bath & water bath instruments, etc.

[0037] In use: A refrigeration system of a low-temperature scroll compressor, the refrigerant is refrigerated through the processes of condenser-throttling-evaporation. When the evaporation temperature gradually decreases, the difference between the high pressure and the lower pressure of compressor 1 gradually increases, the circulation amount of the refrigerant decreases, the motor of compressor 1 heats up and the temperature in the scroll cavity rises rapidly, resulting in damage to the structure of the components of compressor 1 and carbonization of the refrigeration oil, causing compressor 1 to malfunction. The present invention sprays gaseous refrigerant into the cavity of compressor 1 to ensure that the cavity temperature of compressor 1 is maintained within a controllable range, thereby ensuring the reliable operation of the compressor. In addition, spraying gaseous refrigerant into the medium-pressure chamber of compressor 1 can increase the refrigeration capacity of the compressor, thereby improving the energy efficiency of the unit and achieving energy saving.

[0038] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A refrigeration system of a low-temperature scroll compressor, characterized in that: The refrigeration system of the low-temperature scroll compressor is a freezing and refrigeration system, comprising a compressor (1), a condenser (2), a liquid storage device (3), a drying filter (4), a three-way pipeline (5), a liquid pipe sight glass (7), a throttling device (8), an evaporator (9) and a gas-liquid separator (10) which are connected in sequence; A gaseous refrigerant circuit is provided between the outlet end of the three-way pipeline (5) and the liquid injection / gas replenishment port of the compressor (1).

2. The refrigeration system of the low-temperature scroll compressor according to claim 1, characterized in that: The gaseous refrigerant circuit comprises: a capillary tube (6), a solenoid valve (11) and a connecting pipeline; The inlet end of the capillary tube (6) is connected to the outlet end of the three-way pipeline (5), and the outlet end is connected to the inlet end of the solenoid valve (11); The outlet end of the solenoid valve (11) is connected to the liquid injection / air supply port of the compressor through a pipeline.

3. The refrigeration system of the low-temperature scroll compressor according to claim 2, characterized in that: The capillary tube (6) passes through the high-temperature and high-pressure liquid pipeline in the system. When the high-temperature and high-pressure liquid refrigerant flows through the capillary tube, it is affected by the resistance of the capillary tube wall, thereby achieving the effect of reducing the refrigerant temperature. The low-temperature liquid refrigerant in the capillary tube can evaporate and vaporize after absorbing the heat of the high-temperature liquid refrigerant in the system pipeline, and is sprayed into the cavity of the scroll compressor through the solenoid valve (11), thereby achieving the effect of reducing the exhaust temperature of the scroll compressor.

4. The refrigeration system of the low-temperature scroll compressor according to claim 2, characterized in that: The solenoid valve (11) ensures the function of opening when the compressor exhaust temperature is too high and closing when the compressor exhaust temperature is too low.

5. The refrigeration system of the low-temperature scroll compressor according to claim 1, characterized in that: The compressor (1) is a scroll compressor with a liquid injection or air replenishment structure.

6. The refrigeration system of the low-temperature scroll compressor according to claim 1, characterized in that: The drying filter (4) is arranged at the front end of the three-way pipeline (5) to prevent dirt in the system from clogging the capillary tube (6).

7. The refrigeration system of the low-temperature scroll compressor according to claim 1, characterized in that: The refrigerant filled in the refrigeration system of the ultra-low temperature scroll compressor is a HCFC / HFC / HFO refrigerant; The HCFC / HFC / HFO refrigerants include: R22, R404A, R507C, R448A, R449A, and R455A.

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