Refrigerating unit evaporator with liquid storage tank for separating Freon

Abstract

The utility model discloses a refrigerating unit evaporator with a liquid storage tank for separating Freon, which relates to the technical field of chemical production and comprises a screw compressor, the liquid storage tank, a pipeline, a liquid discharging pipe, a compressor air suction pipe and a compressor air suction valve. The liquid storage tank is connected with the screw compressor through a compressor air suction pipe, and a compressor air suction valve is arranged on the compressor air suction pipe. The screw compressor has the characteristics of ensuring that only gas-phase Freon enters the screw compressor and being high in refrigeration efficiency, and is used for solving the problems that liquid Freon cannot be compressed like gas after entering the screw compressor, and when a screw rotor compresses liquid drops, huge impact force is generated, so that the rotor, a bearing and other internal parts are seriously impacted, and the service life of the screw compressor is prolonged. And therefore, mechanical damage is caused.

Description

Technical Field

[0001] This utility model relates to the field of chemical production technology, specifically to an evaporator for a refrigeration unit with a liquid storage tank for separating Freon. Background Technology

[0002] In chemical production processes, refrigeration units are widely used in cryogenic processes. Freon absorbs the heat carried by the frozen brine to be cooled in the evaporator, and evaporates from liquid to gas. In this process, the frozen brine is cooled to the required temperature and indirectly exchanges heat with the heat exchanger of the subsequent process.

[0003] During the operation of the unit, because the Freon system circulates in the shell side of the evaporator and condenser, and the chilled brine and cooling water circulate in the tube side of the evaporator and condenser respectively, it leads to severe scaling inside the evaporator and condenser tubes, reducing the heat exchange efficiency of the heat exchanger. The Freon in the shell side of the evaporator cannot meet the vaporization requirements. Under high load conditions of the screw compressor, a large amount of liquid Freon can easily enter the screw compressor, causing the screw compressor to frequently experience "liquid carryover". Long-term operation will have the following effects on the screw compressor. Utility Model Content

[0004] To address the aforementioned problems, this utility model provides an evaporator for a refrigeration unit with a liquid storage tank for separating Freon. This evaporator ensures that only gaseous Freon enters the screw compressor, resulting in higher refrigeration efficiency. It solves the problem that when liquid Freon enters the screw compressor, it cannot be compressed like a gas. When the screw rotor compresses the liquid droplets, it generates a huge impact force, causing severe impact to the rotor, bearings, and other internal components, resulting in mechanical damage.

[0005] To achieve the above objectives, the technical solution of this utility model is as follows:

[0006] An evaporator for a refrigeration unit with a liquid storage tank for separating Freon is characterized by comprising a screw compressor, a liquid storage tank, pipes, a drain pipe, a compressor suction pipe, and a compressor suction valve. The liquid storage tank is connected to the evaporator assembly via pipes and a bottom drain pipe. The liquid storage tank is connected to the screw compressor via the compressor suction pipe, and a compressor suction valve is provided on the compressor suction pipe.

[0007] It also includes a condenser assembly, a compressor discharge pipe, a throttling pipe, and a throttling valve. The screw compressor outlet is connected to the condenser assembly through the compressor discharge pipe. The condenser assembly is connected to the evaporator assembly through the throttling pipe, and a throttling valve is installed on the throttling pipe.

[0008] The liquid storage tank is equipped with a baffle, the evaporator assembly includes an evaporator and a chilled brine pipe, and the condenser assembly includes a condenser and a cooling water pipe.

[0009] The beneficial effects of this utility model are:

[0010] (1) When this utility model is used, a Freon storage tank is set at the gas outlet of the evaporator to separate the Freon gas-liquid mixture evaporated by the evaporator. The liquid Freon continues to flow into the evaporator for evaporation through the high level difference, and the gaseous Freon continuously enters the suction port of the screw compressor. This can prevent liquid Freon from entering the screw compressor and ensure the stable operation of the screw compressor.

[0011] (2) When this utility model is used, the high-pressure and high-temperature Freon gas at the exhaust port of the screw compressor releases heat in the condenser and condenses into liquid Freon, which flows back to the evaporator assembly through the expansion tube. One cycle completes one heat conversion and transfer.

[0012] (3) When this utility model is used, the heat exchanger tube side is equipped with chilled brine which is pumped and circulated to the chemical plant for heat removal. The Freon in the shell side of the evaporator absorbs the heat carried by the chilled brine in the tube side and evaporates into low-pressure and low-temperature steam. The cooling water is pumped and circulated to cool the condenser. The high-pressure and high-temperature Freon gas at the discharge port of the screw compressor releases heat in the condenser and is carried away by the cooling water, becoming a high-pressure liquid. Heat absorption and release are achieved through the change of Freon phase in each device. The heat is absorbed in the tube side of the evaporator through indirect conduction heat transfer and is finally transferred to the cooling water in the tube side of the condenser. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model.

[0014] Attached reference numerals: 1. Evaporator; 2. Condenser; 3. Screw compressor; 4. Throttling valve; 5. Liquid receiver; 6. Pipe; 7. Drain pipe; 8. Baffle; 9. Compressor suction pipe; 10. Compressor suction valve; 11. Compressor discharge pipe; 12. Throttling pipe; 13. Cooling water pipe; 14. Refrigerated brine pipe. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0016] like Figure 1As shown, an evaporator for a refrigeration unit with a liquid storage tank for separating Freon is characterized by: a screw compressor 3, a liquid storage tank 5, a pipe 6, a liquid drain pipe 7, a compressor suction pipe 9, and a compressor suction valve 10. The liquid storage tank 5 is connected to the evaporator assembly through the pipe 6, and the liquid storage tank 5 is connected to the evaporator assembly through the bottom liquid drain pipe 7. The liquid storage tank 5 is connected to the screw compressor 3 through the compressor suction pipe 9, and the compressor suction pipe 9 is equipped with a compressor suction valve 10.

[0017] like Figure 1 As shown, it also includes a condenser assembly, a compressor discharge pipe 11, a throttling pipe 12, and a throttling valve 4. The outlet end of the screw compressor 3 is connected to the condenser assembly through the compressor discharge pipe 11. The condenser assembly is connected to the evaporator assembly through the throttling pipe 12, and a throttling valve 4 is installed on the throttling pipe 12.

[0018] like Figure 1 As shown, the liquid storage tank 5 is equipped with a baffle 8, the evaporator assembly includes an evaporator 1 and a chilled brine pipe 14, and the condenser assembly includes a condenser 2 and a cooling water pipe 13.

[0019] In use, the evaporator 1 is a shell-and-tube heat exchanger. The shell of the evaporator 1 is usually made of corrosion-resistant materials such as stainless steel, copper or aluminum alloy. The tube side is designed with flow channels to accommodate the heat exchange tube bundle. One or more sets of parallel heat exchange tubes are designed. The tube bundle is composed of several slender tubes. The chilled brine in the chilled brine tube 14 flows inside the tube and exchanges heat with Freon outside the tube. The Freon absorbs a large amount of heat released by the chilled brine inside the tube and its own temperature rises. The Freon absorbs heat and evaporates in the shell side of the heat exchanger, changing from a liquid state to a gaseous state.

[0020] A liquid storage tank 5 is installed at the top of the evaporator 1. A baffle 8 is installed inside the liquid storage tank 5, and a liquid drain pipe 7 is installed at the bottom. The liquid storage tank 5 is connected to the evaporator 1 in the gas phase. The Freon gas evaporated in the evaporator 1 enters the liquid storage tank 5 from the top of the baffle side through the pipe 6. After the liquid phase carried by the evaporated Freon is separated by collision through the baffle 8, the liquid Freon continues to flow into the evaporator 1 through the liquid drain pipe 7 by gravity to absorb heat and vaporize. The gaseous Freon inside the liquid storage tank is connected to the compressor suction pipe 9 through the top of the other side of the baffle, which can ensure that all the gaseous Freon is drawn into the suction port of the screw compressor 3. The compressor is a screw compressor 3 with a suction valve 10 at the inlet. It is a mechanical device that uses one or more pairs of meshing screw rotors to rotate in the cylinder and realizes gas compression by changing the volume between the rotor and the cylinder. Its main work is to complete the entire process of gaseous Freon intake, compression and exhaust. After evaporation in the shell side of evaporator 1, the Freon vapor enters the screw compressor 3, which compresses the Freon vapor into a high-pressure, high-temperature gas. The gas is then discharged to the condenser 3 through the exhaust pipe 9. The condenser 3 is a shell-and-tube heat exchanger. To ensure heat exchange efficiency, the tubes are made of copper alloy. Cooling water pipes 13 are installed on the tube side, and the water is pumped to circulate and cool the condenser. The high-pressure, high-temperature Freon gas at the discharge port of the screw compressor releases heat in the condenser 3, which is carried away by the cooling water and becomes a high-pressure liquid.

[0021] A throttling tube 12 is installed at the bottom of the condenser, and a throttling valve 4 is installed on the throttling tube 12. The high-pressure liquid Freon in the condenser 3 is depressurized and cooled by the throttling device, and becomes a low-pressure, low-temperature liquid and vapor mixture. It then enters the evaporator to absorb heat and evaporate again, thus completing the refrigeration cycle.

[0022] Finally, it should be noted that the above are merely preferred embodiments of this utility model and are not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An evaporator for a refrigeration unit with a liquid storage tank for separating Freon, characterized in that: It includes a screw compressor (3), a liquid storage tank (5), a pipe (6), a liquid drain pipe (7), a compressor suction pipe (9), and a compressor suction valve (10). The liquid storage tank (5) is connected to the evaporator assembly through the pipe (6). The liquid storage tank (5) is connected to the evaporator assembly through the bottom liquid drain pipe (7). The liquid storage tank (5) is connected to the screw compressor (3) through the compressor suction pipe (9). The compressor suction pipe (9) is equipped with a compressor suction valve (10).

2. The evaporator of a refrigeration unit with a storage tank for separating Freon as described in claim 1, characterized in that: It also includes a condenser assembly, a compressor discharge pipe (11), a throttling pipe (12), and a throttling valve (4). The outlet end of the screw compressor (3) is connected to the condenser assembly through the compressor discharge pipe (11). The condenser assembly is connected to the evaporator assembly through the throttling pipe (12). A throttling valve (4) is installed on the throttling pipe (12).

3. The evaporator of a refrigeration unit with a liquid storage tank for separating Freon according to claim 1, characterized in that: The storage tank (5) is equipped with a baffle (8), the evaporator assembly includes an evaporator (1) and a chilled brine pipe (14), and the condenser assembly includes a condenser (2) and a cooling water pipe (13).

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