A refrigeration system of a gas-injection enthalpy-increasing compressor

Abstract

The application discloses a refrigeration system of a gas supplementing and enthalpy increasing compressor and relates to the technical field of refrigeration and heating systems.The refrigeration system comprises a compressor, a condenser, a three-in-one device, a drying filter, a liquid pipe sight glass, an evaporator, a throttling device and a gas supplementing device; the outlet of the compressor is connected with the inlet of the condenser; the outlet of the condenser is connected with the first inlet of the three-in-one device; the first outlet of the three-in-one device is connected with the inlet of the evaporator; the outlet of the evaporator is connected with the second inlet of the three-in-one device; the second outlet of the three-in-one device is connected with the suction port of the compressor, thereby forming a refrigeration circuit; and the gas supplementing port of the compressor is connected with the third outlet of the three-in-one device through a gas supplementing electromagnetic valve, thereby forming a gas supplementing circuit.The refrigeration system of the gas supplementing and enthalpy increasing compressor provided by the application can increase the supercooling degree and the superheating degree of the system and further improve the energy efficiency of the system compared with any form of gas supplementing structure.

Description

Technical Field

[0001] This invention relates to the field of refrigeration and heating systems, and more particularly to a refrigeration system using a gas-injection enthalpy-increasing compressor. Background Technology

[0002] Currently, cryogenic refrigeration or low-ambient-temperature heating technology has a wide range of applications. It involves the refrigerant undergoing alternating processes of condensation and evaporation. By controlling the compressor's exhaust temperature, lower cooling and heating temperatures can be achieved, broadening the application range and replacing traditional methods of gas replenishment or areas achievable with mixed refrigerants. It is widely used in cryogenic freezing and storage of food and biological materials, cryogenic gas liquefaction and separation (such as in the air separation industry and aerospace applications), cryogenic industrial chilled water, superconducting applications, infrared detector cooling, the semiconductor industry, cryogenic biomedicine, and heat pump heating.

[0003] However, existing technologies still have some shortcomings: First, injecting liquid refrigerant into the intermediate-pressure chamber of a scroll compressor (i.e., liquid injection) sacrifices the cooling capacity of the refrigeration system, resulting in a poor COP and failing to meet the requirements of the current national standard GB44015 "Energy Efficiency Limits and Energy Efficiency Grades for Cold Storage Boxes and Compressed Condensing Units". Second, injecting gaseous refrigerant into the intermediate-pressure chamber of a scroll compressor (i.e., jet injection) requires additional system components such as economizers, expansion valves, and solenoid valves, making the system cumbersome and expensive, resulting in low market acceptance and difficulty in promotion. Third, while low-temperature systems using mixed refrigerants can achieve lower temperatures, the safety and environmental friendliness of mixed refrigerants are uncertain.

[0004] To address the problems existing in the prior art, it is essential to research and design a refrigeration system with a gas-injection enthalpy-increasing compressor, thereby overcoming these issues. Summary of the Invention

[0005] To address the aforementioned technical problems with existing technologies, such as the poor COP (Coefficient of Performance) of injecting liquid into the intermediate-pressure chamber of a scroll compressor, which fails to meet the carbon neutrality target; the high cost and low market acceptance of the economizer-based jet method, which hinders widespread adoption; and the poor safety and environmental friendliness of mixed refrigerants, this invention provides a gas-injection enthalpy-increasing compressor refrigeration system. This invention primarily utilizes a gaseous refrigerant injection method at the top of the gas-liquid separator in a three-in-one unit to increase the system's subcooling and superheating, thereby further improving the system's energy efficiency.

[0006] The technical means employed in this invention are as follows: A refrigeration system for a gas-injecting enthalpy-increasing compressor includes: a compressor, a condenser, a three-in-one unit, a dryer filter, a liquid line sight glass, an evaporator, a throttling device, and a gas-injection device; The compressor outlet is connected to the condenser inlet, the condenser outlet is connected to the first inlet of the three-in-one unit, the first outlet of the three-in-one unit is connected to the evaporator inlet, the evaporator outlet is connected to the second inlet of the three-in-one unit, and the second outlet of the three-in-one unit is connected to the compressor suction port, forming a refrigeration circuit; the compressor injection port and the three-in-one unit outlet are connected through an injection solenoid valve, forming an injection circuit.

[0007] Furthermore, a dryer filter and a liquid sight glass are sequentially installed on the pipe connecting the first outlet of the three-in-one device to the inlet of the evaporator. The first outlet of the three-in-one device is connected to the dryer filter, the dryer filter is connected to the inlet of the liquid sight glass, and the outlet of the liquid sight glass is connected to the inlet of the evaporator.

[0008] Furthermore, the three-in-one device is realized by integrating a liquid receiver, a gas-liquid separator, and a heat exchanger. It utilizes the low-temperature refrigerant returning to the gas-liquid separator to exchange heat with the high-pressure liquid refrigerant located in its liquid receiver, thereby increasing the subcooling of the high-pressure liquid refrigerant. It also utilizes the gaseous refrigerant in the upper space of the gas-liquid separator to provide supplementary gas to the gas inlet of the compressor through the third outlet.

[0009] Furthermore, the third outlet III of the three-in-one device is located at the top of the gas-liquid separator.

[0010] Furthermore, the throttling device is disposed at both ends of the evaporator.

[0011] Furthermore, the three-in-one unit is connected in series between the outlet end of the condenser and the inlet end of the evaporator; at the same time, it is also connected in series between the outlet end of the evaporator and the suction port of the compressor.

[0012] Furthermore, the refrigerant used in the refrigeration system is an HCFC, HFC, or HFO type refrigerant.

[0013] Compared with the prior art, the present invention has the following advantages: 1. The refrigeration system of the gas-injection enthalpy-increasing compressor provided by the present invention is simple in structure and lower in cost compared with the existing gas-injection enthalpy-increasing device that uses an economizer structure, which meets the development needs of the industry. 2. The refrigeration system of the gas-injection enthalpy-increasing compressor provided by the present invention increases the subcooling and superheat of the system compared with any form of gas-injection structure, thereby further improving the energy efficiency of the system; 3. The refrigeration system of the gas-injection enthalpy-increasing compressor provided by the present invention adopts the method of gas injection of gaseous refrigerant in the upper part of the gas-liquid separator in the three-in-one device. Compared with the traditional gas injection structure, it has the advantages of simple structure, low price, high reliability and higher market acceptance.

[0014] In summary, the technical solution of this invention solves the problems of high cost, low market acceptance, and difficulty in promotion of the gas replenishment method in the compressor intermediate pressure chamber using the gas replenishment and enthalpy enhancement structure in the prior art. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the system in an embodiment of the present invention.

[0017] In the diagram: 1. Compressor; 2. Condenser; 3. Three-in-one unit; 31. First inlet; 32. First outlet; 33. Second inlet; 34. Second outlet; 35. Third outlet; 4. Dryer filter; 5. Liquid pipe sight glass; 6. Throttling device; 7. Evaporator; 8. Gas supply solenoid valve. Detailed Implementation

[0018] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0019] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0021] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0022] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention. The directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0023] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0024] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0025] This invention proposes a refrigeration system for a gas-injecting enthalpy-increasing compressor 1, such as... Figure 1 As shown, it includes: compressor 1, condenser 2, three-in-one unit 3, dryer filter 4, liquid pipe sight glass 5, evaporator 7, throttling device 6, and gas injection device; The outlet of compressor 1 is connected to the inlet of condenser 2, the outlet of condenser 2 is connected to the first inlet 31 of three-in-one unit 3, the first outlet 32 ​​of three-in-one unit 3 is connected to the inlet of evaporator 7, the outlet of evaporator 7 is connected to the second inlet 33 of three-in-one unit 3, and the second outlet 34 of three-in-one unit 3 is connected to the suction port of compressor 1, forming a refrigeration circuit; the gas supply port of compressor 1 and the third outlet 35 of three-in-one unit 3 are connected through gas supply solenoid valve 8, forming a gas supply circuit; the throttling device 6 is set at both ends of evaporator 7, and the throttling device 6 can be a capillary tube, a mechanical expansion valve, or an electronic expansion valve, the main function of which is to change the high-pressure liquid refrigerant into a low-pressure liquid refrigerant.

[0026] A dryer filter 4 and a liquid tube sight glass 5 are sequentially installed on the pipe connecting the first outlet 31 of the three-in-one device 3 to the inlet of the evaporator 7. The first outlet 31 of the three-in-one device 3 is connected to the dryer filter 4, the dryer filter 4 is connected to the inlet of the liquid tube sight glass 5, and the outlet of the liquid tube sight glass 5 is connected to the inlet of the evaporator 7.

[0027] The three-in-one unit 3 is realized by integrating a liquid receiver, a gas-liquid separator, and a heat exchanger. It utilizes the low-temperature refrigerant returning to the gas-liquid separator to exchange heat with the high-pressure liquid refrigerant located in its liquid receiver, thereby increasing the subcooling of the high-pressure liquid refrigerant (increasing the enthalpy value and avoiding the occurrence of flash gas). This can significantly improve the working efficiency of the compressor 1, effectively prevent liquid refrigerant from entering the suction pipe of the compressor 1, and use the gaseous refrigerant in the upper space of the gas-liquid separator to provide supplementary gas to the gas inlet of the compressor 1 through the third outlet 35, thus replacing the economizer.

[0028] The third outlet 35 of the three-in-one unit 3 is located at the top of the gas-liquid separator, ensuring that the refrigerant in the upper part of the gas-liquid separator is in a gaseous state. At the same time, it increases or decreases the subcooling and superheat through heat exchange, thereby improving the energy efficiency of the system.

[0029] The three-in-one unit 3 is connected in series between the outlet end of the condenser 2 and the inlet end of the evaporator 7; at the same time, it is also connected in series between the outlet end of the evaporator 7 and the suction port of the compressor 1.

[0030] The refrigerant used in the refrigeration system is an HCFC, HFC, or HFO type refrigerant.

[0031] Compressor 1 is a compressor 1 with a gas injection and enthalpy increase structure. The types of compressor 1 include rotary compressor 1, scroll compressor 1, piston compressor 1, etc.

[0032] Besides being used in low-temperature cold storage and heat pump heating, refrigeration cycle systems can also be specifically used in low-temperature environmental test chambers, low-temperature oil bath & water bath instruments, drying equipment, etc.

[0033] In use: A refrigeration system using a gas-injected enthalpy-increasing compressor 1 achieves refrigeration through a process involving condenser 2, throttling, and evaporation. When the evaporation temperature gradually decreases or the ambient temperature is low for heating, the difference between the high pressure and the lower pressure of compressor 1 gradually increases. This causes the compressor 1 motor to overheat and the temperature inside the scroll chamber to rise rapidly, leading to structural damage to compressor 1 components and carbonization of the refrigerant oil, resulting in compressor 1 malfunction. This invention addresses this by injecting gaseous refrigerant into the compressor 1 cavity, ensuring that the temperature inside the compressor 1 cavity remains within a controllable range and guaranteeing reliable operation of compressor 1. Furthermore, injecting gaseous refrigerant into the intermediate pressure chamber of compressor 1 can increase the cooling capacity of compressor 1, thereby improving the unit's energy efficiency and achieving energy savings.

[0034] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions 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 for a gas-injection enthalpy-increasing compressor, characterized in that, include: Compressor, condenser, three-in-one unit, dryer filter, liquid line sight glass, evaporator, throttling device and gas injection device; The compressor outlet is connected to the condenser inlet, the condenser outlet is connected to the first inlet of the three-in-one unit, the first outlet of the three-in-one unit is connected to the evaporator inlet, the evaporator outlet is connected to the second inlet of the three-in-one unit, and the second outlet of the three-in-one unit is connected to the compressor suction port, forming a refrigeration circuit; the compressor injection port and the three-in-one unit outlet are connected through an injection solenoid valve, forming an injection circuit.

2. The refrigeration system of the gas-injection enthalpy-increasing compressor according to claim 1, characterized in that, A dryer filter and a liquid sight glass are sequentially installed on the pipe connecting the first outlet of the three-in-one device to the inlet of the evaporator. The first outlet of the three-in-one device is connected to the dryer filter, the dryer filter is connected to the inlet of the liquid sight glass, and the outlet of the liquid sight glass is connected to the inlet of the evaporator.

3. The refrigeration system of the gas-injection enthalpy-increasing compressor according to claim 1, characterized in that, The three-in-one device is realized by integrating a liquid receiver, a gas-liquid separator, and a heat exchanger. It utilizes the low-temperature refrigerant returning to the gas-liquid separator to exchange heat with the high-pressure liquid refrigerant located in its liquid receiver, thereby increasing the subcooling of the high-pressure liquid refrigerant. It also utilizes the gaseous refrigerant in the upper space of the gas-liquid separator to provide supplementary gas to the gas inlet of the compressor through the third outlet.

4. The refrigeration system of the gas-injection enthalpy-increasing compressor according to claim 3, characterized in that, The third outlet of the three-in-one device is located at the top of the gas-liquid separator.

5. The refrigeration system of the gas-injection enthalpy-increasing compressor according to claim 1, characterized in that, The throttling device is located at both ends of the evaporator.

6. The refrigeration system of the gas-injection enthalpy-increasing compressor according to claim 1, characterized in that, The three-in-one unit is connected in series between the outlet end of the condenser and the inlet end of the evaporator; it is also connected in series between the outlet end of the evaporator and the suction port of the compressor.

7. The refrigeration system of the gas-injection enthalpy-increasing compressor according to claim 1, characterized in that, The refrigerant used in the refrigeration system is an HCFC, HFC, or HFO type refrigerant.

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