Gas cooling system and low-temperature crushing equipment

Abstract

The utility model relates to the technical field of low-temperature crushing equipment, and discloses a gas cooling system and low-temperature crushing equipment, and the gas cooling system comprises a compressor, a condenser, an oil cooler, an economizer, a main throttle valve, a micro-channel evaporator and a gas-liquid separator. The gas cooling system comprises a refrigerant outlet of a compressor, a condenser, a refrigerant inlet of an economizer, a supercooled liquid refrigerant outlet of the economizer, a main throttle valve, a micro-channel evaporator, a gas-liquid separator and a first refrigerant loop of a refrigerant inlet of the compressor. The micro-channel evaporator is used for cooling gas required by the low-temperature crushing equipment, the heat exchange area in unit volume of the micro-channel evaporator is large, the heat exchange efficiency is high, and the overall volume is small under the same heat exchange area. The gas cooling system further comprises a compressor cooling loop communicated with the oil cooler and the compressor and a water cooling loop communicated with external cooling water, the condenser and the oil cooler, and the working performance of the compressor and the heat exchange efficiency of the condenser and the oil cooler are guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of cryogenic pulverizing equipment technology, and in particular to a gas cooling system and cryogenic pulverizing equipment. Background Technology

[0002] Existing powder pulverizing equipment is mostly air jet milling equipment and cryogenic milling equipment. Cryogenic milling equipment can pulverize materials at extremely low temperatures, which can significantly reduce the safety risks when handling heat-sensitive materials, brittle materials, and explosive powders. However, due to the large temperature difference between the gas phase and the powder, cryogenic milling often requires multi-stage cooling, which leads to an increase in the number of heat exchangers required, energy consumption, and installation space.

[0003] Therefore, there is an urgent need for a gas cooling system and a cryogenic pulverizing device to solve the above problems. Utility Model Content

[0004] One objective of this invention is to provide a gas cooling system that can meet the high temperature difference cooling requirements of crushing equipment, while reducing the number of heat exchange devices, energy consumption, and space.

[0005] Based on the above concept, the technical solution adopted by this utility model is as follows:

[0006] A gas cooling system is provided, characterized in that it includes a compressor, a condenser, an oil cooler, an economizer, a main throttle valve, a microchannel evaporator, and a gas-liquid separator;

[0007] The gas cooling system includes a first refrigerant circuit, which connects the refrigerant outlet of the compressor, the refrigerant inlet of the condenser, the refrigerant outlet of the condenser, the refrigerant inlet of the economizer, the subcooled liquid refrigerant outlet of the economizer, the refrigerant inlet of the main throttle valve, the refrigerant outlet of the main throttle valve, the refrigerant inlet of the microchannel evaporator, the refrigerant outlet of the microchannel evaporator, the refrigerant inlet of the gas-liquid separator, and the refrigerant outlet of the gas-liquid separator to the refrigerant inlet of the compressor.

[0008] The gas cooling system includes a compressor cooling circuit, which connects the lubricating oil passage of the compressor and the lubricating oil passage of the oil cooler.

[0009] The gas cooling system also includes a water cooling circuit, which is connected to external cooling water, the water cooling channel of the condenser, and the water cooling channel of the oil cooler;

[0010] The microchannel evaporator is used to cool the gas required by the cryogenic pulverizing equipment.

[0011] Optionally, the water cooling circuit includes a first water cooling circuit and a second water cooling circuit connected in parallel. The first water cooling circuit is connected to the external cooling water outlet, the water cooling inlet of the condenser, and the water cooling outlet of the condenser to the external cooling water inlet. The second water cooling circuit is connected to the external cooling water outlet, the water cooling inlet of the oil cooler, and the water cooling outlet of the oil cooler to the external cooling water inlet.

[0012] Optionally, the gas cooling system further includes a second refrigerant circuit, which connects the low-pressure vapor refrigerant outlet of the economizer to the refrigerant intermediate stage inlet of the compressor.

[0013] Optionally, the gas cooling system further includes a third refrigerant circuit, which connects the subcooled liquid refrigerant outlet to the refrigerant inlet of the compressor;

[0014] Optionally, a first temperature sensor is provided at the refrigerant outlet of the compressor. The first temperature sensor is used to detect the temperature of the refrigerant at the refrigerant outlet of the compressor. A first liquid injection valve is provided on the third refrigerant circuit. The first liquid injection valve is signal-connected to the first temperature sensor.

[0015] Optionally, the gas cooling system further includes a fourth refrigerant circuit, which connects the subcooled liquid refrigerant outlet to the refrigerant intermediate stage inlet of the compressor;

[0016] Optionally, a first temperature sensor is provided at the refrigerant outlet of the compressor. The first temperature sensor is used to detect the temperature of the refrigerant at the refrigerant outlet of the compressor. A second liquid injection valve is provided on the fourth refrigerant circuit. The second liquid injection valve is signal-connected to the first temperature sensor.

[0017] Optionally, the gas cooling system further includes an economizer throttle valve, which is disposed in the first refrigerant circuit and located between the economizer and the condenser.

[0018] Optionally, the gas cooling system further includes an auxiliary throttle valve and a refrigerant bypass circuit. The auxiliary throttle valve is disposed in the refrigerant bypass circuit. One end of the refrigerant bypass circuit is connected between the economizer and the main throttle valve, and the other end is connected between the main throttle valve and the microchannel evaporator.

[0019] Optionally, the gas cooling system includes a lubricating oil bypass circuit, one end of which is connected to the oil inlet of the oil cooler, and the other end of which is connected to the oil outlet of the oil cooler;

[0020] Optionally, an oil bypass solenoid valve is provided on the lubricating oil bypass circuit, and an oil temperature switch is provided on the compressor cooling circuit. The oil bypass solenoid valve is signal-connected to the oil temperature switch.

[0021] Optionally, the gas cooling system further includes a dryer filter disposed in the first refrigerant circuit and located between the condenser and the economizer.

[0022] Another objective of this invention is to provide a low-temperature pulverizing device that can meet the high temperature difference cooling requirements of pulverizing equipment, while reducing the number of heat exchange devices, energy consumption, and space.

[0023] Based on the above concept, the technical solution adopted by this utility model is as follows:

[0024] A cryogenic pulverizing device is provided, comprising a pulverizing device body and the aforementioned gas cooling system, wherein the cryogenic gas inlet of the pulverizing device body is connected to the cryogenic gas outlet of the microchannel evaporator.

[0025] The beneficial effects of this utility model are as follows:

[0026] The gas cooling system proposed in this utility model includes a compressor, a condenser, an oil cooler, an economizer, a main throttle valve, a microchannel evaporator, and a gas-liquid separator. The gas cooling system includes a first refrigerant circuit, which connects the refrigerant outlet of the compressor, the refrigerant inlet and outlet of the condenser, the refrigerant inlet and outlet of the economizer, the subcooled liquid refrigerant outlet of the economizer, the refrigerant inlet and outlet of the main throttle valve, the refrigerant inlet and outlet of the microchannel evaporator, the refrigerant inlet and outlet of the gas-liquid separator, and finally the refrigerant inlet of the compressor. The compressor compresses the gaseous refrigerant into a high-temperature, high-pressure gaseous refrigerant. This high-temperature, high-pressure gaseous refrigerant is then cooled by the condenser to become a high-temperature, high-pressure liquid refrigerant. This liquid refrigerant is further cooled by the economizer to become a subcooled liquid refrigerant. The subcooled liquid refrigerant is then further depressurized and cooled by the main expansion valve to become a low-temperature, low-pressure liquid refrigerant. This low-temperature, low-pressure liquid refrigerant enters the microchannel evaporator to absorb heat from the gas inside and evaporate into a gaseous refrigerant. Simultaneously, it cools the gas entering the microchannel evaporator. Finally, the gaseous refrigerant flows back to the compressor's refrigerant inlet via a gas-liquid separator. The microchannel evaporator uses multiple layers of flat microchannel plates, greatly increasing the heat exchange area per unit volume, thereby improving heat exchange efficiency. For the same heat exchange area, the overall volume of the evaporator is reduced. The microchannel design also allows the refrigerant to flow within extremely small channels, reducing the required refrigerant charge and lowering costs.

[0027] The gas cooling system also includes a compressor cooling circuit, which connects the compressor's lubricating oil passages and the oil cooler's lubricating oil passages. The gas cooling system also includes a water cooling circuit, which connects the external cooling water outlet, the condenser's water cooling passages, and the oil cooler's water cooling passages. The oil cooler uses external cooling water to cool the lubricating oil flowing in the compressor cooling circuit, thus ensuring the compressor is always at a suitable operating temperature. The external cooling water can flow to the condenser and oil cooler to cool the high-temperature, high-pressure gaseous refrigerant entering the condenser, ensuring the condenser's heat exchange efficiency, and to cool the high-temperature lubricating oil entering the oil cooler, ensuring the oil cooler's heat exchange efficiency.

[0028] The cryogenic pulverizing equipment proposed in this utility model includes a pulverizing equipment body and the aforementioned gas cooling system. The cryogenic gas inlet of the pulverizing equipment body is connected to the cryogenic gas outlet of the microchannel evaporator. The gas cooling system supplies cryogenic gas to the pulverizing equipment body through the cryogenic gas outlet of the microchannel evaporator, enabling the cryogenic pulverizing equipment to meet the high temperature difference cooling requirements, while reducing the number of heat exchange devices, energy consumption, and space saving. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the gas cooling system provided in an embodiment of the present invention.

[0030] In the picture:

[0031] 1. Compressor; 111. Refrigerant intermediate stage inlet; 2. Condenser; 3. Oil cooler; 4. Economizer; 41. Subcooled liquid refrigerant outlet; 42. Low-pressure vapor refrigerant outlet; 5. Main throttle valve; 6. Microchannel evaporator; 7. Gas-liquid separator; 8. Oil separator; 9. Economizer throttle valve; 10. Auxiliary throttle valve; 11. Dryer filter; 12. Economizer return gas filter; 13. Sight glass;

[0032] 101. First injection valve; 102. Second injection valve; 103. Oil bypass solenoid valve; 104. Oil temperature switch; 105. First temperature sensor;

[0033] 201. First refrigerant circuit; 202. Second refrigerant circuit; 203. Third refrigerant circuit; 204. Fourth refrigerant circuit; 205. Refrigerant bypass circuit; 206. Compressor cooling circuit; 207. Lubricating oil bypass circuit; 208. First water-cooling circuit; 209. Second water-cooling circuit. Detailed Implementation

[0034] To make the technical problem solved by this utility model, the technical solution adopted, and the technical effect achieved clearer, the technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely for explaining this utility model and not for limiting it. Furthermore, it should be noted that, for ease of description, only the parts related to this utility model are shown in the accompanying drawings, not all of them.

[0035] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0036] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0037] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and 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. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0038] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0039] like Figure 1As shown, this embodiment provides a gas cooling system, including a compressor 1, a condenser 2, an oil cooler 3, an economizer 4, a main throttle valve 5, a microchannel evaporator 6, and a gas-liquid separator 7. The gas cooling system includes a first refrigerant circuit 201, which connects the refrigerant outlet of the compressor 1, the refrigerant inlet and outlet of the condenser 2, the refrigerant inlet of the economizer 4, the subcooled liquid refrigerant outlet 41 of the economizer 4, the refrigerant inlet and outlet of the main throttle valve 5, the refrigerant inlet and outlet of the microchannel evaporator 6, the refrigerant inlet and outlet of the gas-liquid separator 7, and the refrigerant outlet of the gas-liquid separator 7 to the refrigerant inlet of the compressor 1.

[0040] In practice, compressor 1 compresses the gaseous refrigerant into a high-temperature, high-pressure gaseous refrigerant. This high-temperature, high-pressure gaseous refrigerant is then cooled by condenser 2 to become a high-temperature, high-pressure liquid refrigerant. This liquid refrigerant is further cooled by economizer 4 to become a subcooled liquid refrigerant. The subcooled liquid refrigerant is then further depressurized and cooled by main throttle valve 5 to become a low-temperature, low-pressure liquid refrigerant. This low-temperature, low-pressure liquid refrigerant enters microchannel evaporator 6 to absorb heat from the gas inside and evaporate into a gaseous refrigerant, thus cooling the gas entering the microchannel evaporator 6. Finally, the gaseous refrigerant flows back to the refrigerant inlet of compressor 1 via gas-liquid separator 7. The microchannel evaporator 6 uses multi-layered flat microchannel plates, greatly increasing the heat exchange area per unit volume, thereby improving heat exchange efficiency and reducing the overall volume of the evaporator for the same heat exchange area. The microchannel design also allows the refrigerant to flow within extremely small channels, reducing the required refrigerant charge and lowering costs.

[0041] In this embodiment, the microchannel evaporator 6 is an all-aluminum microchannel evaporator.

[0042] In addition, the gas cooling system also includes a compressor cooling circuit 206, which connects the lubricating oil passage of compressor 1 and the lubricating oil passage of oil cooler 3. In this embodiment, the compressor cooling circuit 206 connects the oil outlet of compressor 1 and the oil inlet of oil cooler 3, with the oil outlet of oil cooler 3 leading to the oil inlet of compressor 1. The gas cooling system also includes a water cooling circuit, which connects the external cooling water outlet, the water cooling passage of condenser 2, and the water cooling passage of oil cooler 3. In specific implementation, oil cooler 3 cools the lubricating oil flowing in compressor cooling circuit 206 with external cooling water, thereby ensuring that compressor 1 is always at a suitable operating temperature. Condenser 2 cools the refrigerant flowing through condenser 2 with external cooling water, ensuring that the high-temperature, high-pressure gaseous refrigerant becomes a high-temperature, high-pressure liquid refrigerant after being cooled by condenser 2.

[0043] Furthermore, the water-cooling circuit of the gas cooling system in this embodiment includes a first water-cooling circuit 208 and a second water-cooling circuit 209 connected in parallel. The first water-cooling circuit 208 connects the external cooling water outlet, the water-cooling inlet of the condenser 2, and the water-cooling outlet of the condenser 2 to the external cooling water inlet. The second water-cooling circuit 209 connects the external cooling water outlet, the water-cooling inlet of the oil cooler 3, and the water-cooling outlet of the oil cooler 3 to the external cooling water inlet. That is, the external cooling water can flow to the condenser 2 and the oil cooler 3 respectively, so that the condenser 2 can cool the high-temperature, high-pressure gaseous refrigerant entering the condenser 2 with the lower-temperature cooling water, ensuring the heat exchange efficiency of the condenser 2; and the oil cooler 3 can also cool the high-temperature lubricating oil entering the oil cooler 3 with the lower-temperature cooling water, ensuring the heat exchange efficiency of the oil cooler 3, thereby further improving the heat exchange efficiency of the gas cooling system.

[0044] Optionally, the gas cooling system also includes a second refrigerant circuit 202, which connects the low-pressure vapor refrigerant outlet 42 of the economizer 4 to the refrigerant intermediate stage inlet 111 of the compressor 1. A portion of the high-temperature, high-pressure liquid refrigerant, after being cooled by the economizer 4, becomes low-pressure vapor refrigerant. Since the low-pressure vapor refrigerant already possesses a certain pressure and temperature, it directly returns to the refrigerant intermediate stage inlet 111 of the compressor 1. This allows the compressor 1 to further compress this portion of refrigerant in the high-pressure stage, reducing overall compression power consumption.

[0045] In this embodiment, the gas cooling system also includes an economizer return gas filter 12, which is disposed in the second refrigerant circuit 202 and downstream of the economizer 4. The economizer return gas filter 12 effectively captures solid particles in the gas returning from the economizer 4 to the compressor 1, preventing these solid particles from entering the compressor 1 and causing wear. The economizer return gas filter 12 can also separate small amounts of liquid carried in the low-pressure vapor refrigerant, preventing liquid refrigerant from entering the compressor 1 and avoiding liquid slugging.

[0046] Optionally, the gas cooling system also includes a third refrigerant circuit 203, which connects the subcooled liquid refrigerant outlet 41 of the economizer 4 to the refrigerant inlet of the compressor 1. A first temperature sensor 105 is installed at the refrigerant outlet of the compressor 1 to detect the temperature of the refrigerant at the outlet. A first injection valve 101 is installed on the third refrigerant circuit 203 and is signal-connected to the first temperature sensor 105. In specific implementation, the first injection valve 101 allows the subcooled liquid refrigerant to be directly injected into the refrigerant inlet of the compressor 1 through the third refrigerant circuit 203, effectively reducing the temperature of the gas drawn into the refrigerant inlet of the compressor 1. When the gas temperature at the refrigerant inlet of the compressor 1 decreases, the compressor 1 temperature at the refrigerant outlet will also decrease under the same power. When the first temperature value detected by the first temperature sensor 105 exceeds the first preset temperature value, the first liquid injection valve 101 can be opened to connect the third refrigerant circuit 203 and prevent the refrigerant downstream of the economizer 4 from continuing to flow to the microchannel evaporator 6.

[0047] Optionally, the gas cooling system also includes a fourth refrigerant circuit 204, which connects the subcooled liquid refrigerant outlet 41 of the economizer 4 to the refrigerant inlet of the compressor 1. A first temperature sensor 105 is installed at the refrigerant outlet of the compressor 1 to detect the temperature of the refrigerant at the outlet. A second injection valve 102 is installed on the fourth refrigerant circuit 204 and is signal-connected to the first temperature sensor 105. In specific implementation, the second injection valve 102 allows the subcooled liquid refrigerant to be directly injected into the intermediate refrigerant inlet 111 of the compressor 1 through the fourth refrigerant circuit 204, effectively reducing the overall power consumption of the compressor 1. Under the same power, the gas temperature at the refrigerant outlet of the compressor 1 will also decrease. That is, when the first temperature value detected by the first temperature sensor 105 exceeds the first preset temperature value, the second injection valve 102 can be opened to connect the fourth refrigerant circuit 204, preventing the refrigerant downstream of the economizer 4 from continuing to flow to the microchannel evaporator 6.

[0048] Optionally, the gas cooling system also includes an economizer throttle valve 9, which is located in the first refrigerant circuit 201 and between the economizer 4 and the condenser 2. The economizer throttle valve 9 is positioned upstream of the economizer 4 and can precisely adjust the flow rate of the high-temperature, high-pressure liquid refrigerant entering the economizer 4, preventing excessive high-temperature, high-pressure liquid refrigerant from entering the economizer 4 and causing excessive flash gas. In specific implementations, the economizer throttle valve 9 is connected to temperature and pressure sensors located between the low-pressure vapor refrigerant outlet 42 and the refrigerant intermediate stage inlet 111 of the compressor 1. That is, the opening degree of the economizer throttle valve 9 can be adjusted according to the temperature and pressure of the low-pressure vapor refrigerant at the low-pressure vapor refrigerant outlet 42 to ensure the operating performance of the economizer 4.

[0049] Optionally, the gas cooling system also includes an auxiliary throttle valve 10 and a refrigerant bypass circuit 205. The auxiliary throttle valve 10 is located in the refrigerant bypass circuit 205. One end of the refrigerant bypass circuit 205 is connected between the economizer 4 and the main throttle valve 5, and the other end is connected between the main throttle valve 5 and the microchannel evaporator 6. The refrigerant bypass circuit 205 allows the subcooled liquid refrigerant to be depressurized and cooled by either the main throttle valve 5 or the auxiliary throttle valve 10 before entering the microchannel evaporator 6. The auxiliary throttle valve 10 enhances the depressurization and cooling capability of this throttle valve for the subcooled liquid refrigerant. Both the main throttle valve 5 and the auxiliary throttle valve 10 are connected to the temperature sensor and pressure sensor located between the microchannel evaporator 6 and the gas-liquid separator 7. That is, the opening degree of the main throttle valve 5 and the auxiliary throttle valve 10 can be adjusted according to the temperature and pressure of the gaseous refrigerant downstream of the microchannel evaporator 6 to ensure that the temperature and pressure of the gaseous refrigerant entering the compressor 1 meet the preset requirements.

[0050] Optionally, the gas cooling system also includes a lubricating oil bypass circuit 207. One end of the lubricating oil bypass circuit 207 is connected to the oil inlet of the oil cooler 3, and the other end is connected to the oil outlet of the oil cooler 3. An oil bypass solenoid valve 103 is installed on the lubricating oil bypass circuit 207, and an oil temperature switch 104 is installed on the compressor cooling circuit 206. The oil bypass solenoid valve 103 is signal-connected to the oil temperature switch 104. In specific implementation, the oil temperature switch 104 is used to measure the temperature of the lubricating oil that has been cooled by the oil cooler 3 and is about to enter the compressor 1. When the measured oil temperature exceeds a preset oil temperature value, the oil bypass solenoid valve 103 is opened, so that the lubricating oil bypass circuit 207 is open. This allows some of the lubricating oil that has already been cooled by the oil cooler 3 once to return to the oil cooler 3 through the lubricating oil bypass circuit 207 for further cooling, thereby reducing the temperature of the lubricating oil flowing back to the compressor 1 and ensuring the operating performance of the compressor 1.

[0051] Optionally, the gas cooling system also includes an oil separator 8, located in the first refrigerant circuit 201. The inlet of the oil separator 8 is connected to the refrigerant outlet of the compressor 1, the refrigerant outlet of the oil separator 8 is connected to the refrigerant inlet of the condenser 2, and the lubricating oil outlet of the oil separator 8 is connected to the refrigerant inlet of the compressor 1. The oil separator 8 is used to separate lubricating oil from the compressed high-temperature, high-pressure gaseous refrigerant, preventing excessive lubricating oil from entering the condenser 2 and affecting the heat exchange efficiency of the condenser 2. The separated lubricating oil can be returned to the compressor 1, ensuring that the compressor 1 always has sufficient lubricating oil for lubrication.

[0052] Optionally, the gas cooling system also includes a dryer filter 11, which is disposed in the first refrigerant circuit 201 and located between the condenser 2 and the economizer 4. The dryer filter 11 is used to remove moisture and impurities from the high-temperature, high-pressure liquid refrigerant after condensation, thereby improving the reliability and stability of the gas cooling system. In this embodiment, a sight glass 13 is also provided downstream of the dryer filter 11. The sight glass 13 is used to observe whether moisture, bubbles, or impurities still exist in the refrigerant after it has been dried by the dryer filter 11. In specific implementation, refrigerant ball valves can be installed upstream and downstream of the dryer filter 11 to facilitate the control of the refrigerant flow through the dryer filter 11, and also to facilitate the maintenance and replacement of the dryer filter 11.

[0053] This embodiment also provides a cryogenic pulverizing device, including a pulverizing device body and the aforementioned gas cooling system. The cryogenic gas inlet of the pulverizing device body is connected to the cryogenic gas outlet of the microchannel evaporator 6. The gas cooling system supplies cryogenic gas to the pulverizing device body through the cryogenic gas outlet of the microchannel evaporator 6, enabling the cryogenic pulverizing device to meet the high temperature difference cooling requirements, while reducing the number of heat exchange devices, energy consumption, and space saving. The microchannel evaporator 6 also has a gas inlet, through which the gas to be cooled can enter the gas channel of the microchannel evaporator 6 for heat exchange with the cryogenic, low-pressure liquid refrigerant in the refrigerant channel of the microchannel evaporator 6, thereby achieving rapid cooling of the gas.

[0054] The above embodiments merely illustrate the basic principles and characteristics of this utility model. This utility model is not limited to the above embodiments. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A gas cooling system, characterized by, The gas cooling system comprises a compressor (1), a condenser (2), an oil cooler (3), an economizer (4), a main throttle valve (5), a micro-channel evaporator (6) and a gas-liquid separator (7). The gas cooling system comprises a first refrigerant circuit (201) which is connected with the refrigerant outlet of the compressor (1), the refrigerant inlet of the condenser (2), the refrigerant outlet of the condenser (2), the refrigerant inlet of the economizer (4), the subcooled liquid refrigerant outlet (41) of the economizer (4), the refrigerant inlet of the main throttle valve (5), the refrigerant outlet of the main throttle valve (5), the refrigerant inlet of the micro-channel evaporator (6), the refrigerant outlet of the micro-channel evaporator (6), the refrigerant inlet of the gas-liquid separator (7), the refrigerant outlet of the gas-liquid separator (7) and the refrigerant inlet of the compressor (1). The gas cooling system comprises a compressor cooling circuit (206) which is connected with the lubricating oil flow channel of the compressor (1) and the lubricating oil flow channel of the oil cooler (3). The gas cooling system further comprises a water cooling circuit which is connected with external cooling water, the water cooling flow channel of the condenser (2) and the water cooling flow channel of the oil cooler (3). The micro-channel evaporator (6) is used for cooling the gas required by a low-temperature crushing device.

2. The gas cooling system of claim 1, wherein, The water cooling circuit comprises a first water cooling circuit (208) and a second water cooling circuit (209) which are connected in parallel, the first water cooling circuit (208) is connected with the external cooling water outlet, the water cooling inlet of the condenser (2), the water cooling outlet of the condenser (2) and the external cooling water inlet, and the second water cooling circuit (209) is connected with the external cooling water outlet, the water cooling inlet of the oil cooler (3), the water cooling outlet of the oil cooler (3) and the external cooling water inlet.

3. The gas cooling system of claim 1, wherein, The gas cooling system further comprises a second refrigerant circuit (202) which is connected with the low-pressure vapor refrigerant outlet (42) of the economizer (4) and the refrigerant intermediate stage inlet (111) of the compressor (1).

4. The gas cooling system of claim 1, wherein, The gas cooling system further comprises a third refrigerant circuit (203) which is connected with the subcooled liquid refrigerant outlet (41) and the refrigerant inlet of the compressor (1).

5. The gas cooling system of claim 4, wherein, The refrigerant outlet of the compressor (1) is provided with a first temperature sensor (105) which is used for detecting the temperature of the refrigerant at the refrigerant outlet of the compressor (1), and a first injection valve (101) is arranged on the third refrigerant circuit (203) and is signal-connected with the first temperature sensor (105).

6. The gas cooling system of claim 1, wherein, The gas cooling system further comprises a fourth refrigerant circuit (204) which is connected with the subcooled liquid refrigerant outlet (41) and the refrigerant intermediate stage inlet (111) of the compressor (1).

7. The gas cooling system of claim 6, wherein, The compressor (1) is provided with a first temperature sensor (105) for detecting the temperature of the refrigerant at the outlet of the compressor (1), and a second expansion valve (102) is arranged on the fourth refrigerant circuit (204) and connected to the first temperature sensor (105).

8. The gas cooling system of claim 3, wherein, The gas cooling system further comprises an economizer throttle valve (9) arranged on the first refrigerant circuit (201) between the economizer (4) and the condenser (2).

9. The gas cooling system of claim 1, wherein, The gas cooling system further comprises an auxiliary throttle valve (10) and a refrigerant bypass circuit (205), wherein the auxiliary throttle valve (10) is arranged on the refrigerant bypass circuit (205), and one end of the refrigerant bypass circuit (205) is connected between the economizer (4) and the main throttle valve (5), and the other end is connected between the main throttle valve (5) and the micro-channel evaporator (6).

10. The gas cooling system of claim 1, wherein, The gas cooling system comprises a lubricating oil bypass circuit (207), wherein one end of the lubricating oil bypass circuit (207) is connected to the oil inlet of the oil cooler (3), and the other end is connected to the oil outlet of the oil cooler (3).

11. The gas cooling system of claim 10, wherein, An oil bypass solenoid valve (103) is arranged on the lubricating oil bypass circuit (207), and an oil temperature switch (104) is arranged on the compressor cooling circuit (206), and the oil bypass solenoid valve (103) is connected to the oil temperature switch (104).

12. The gas cooling system of claim 1, wherein, The gas cooling system further comprises a drying filter (11) arranged on the first refrigerant circuit (201) between the condenser (2) and the economizer (4).

13. Cryogenic milling apparatus characterized in that, The gas cooling system comprises a pulverizing device body and the gas cooling system according to any one of claims 1 to 12, wherein the low-temperature gas inlet of the pulverizing device body is connected to the low-temperature gas outlet of the micro-channel evaporator (6).

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