Running system for double refrigeration compressors of refrigeration dryer

Abstract

The utility model relates to a double-refrigeration-compressor operation system of a refrigeration dryer, and belongs to the field of refrigeration equipment. The second refrigerating machine is composed of a second water-cooled condenser, a second refrigerating compressor, a second refrigerant filter, a second hot air bypass valve and a second thermostatic expansion valve, a first refrigerating machine is arranged in parallel with the second refrigerating machine, the compressed air handling capacity of the first refrigerating machine is twice that of the second refrigerating machine, and the first refrigerating machine and the second refrigerating machine are the same in structure; evaporating pipes of the first refrigerating machine and the second refrigerating machine are arranged in the evaporator in parallel, the evaporator is communicated with a cavity of the precooler, an air inlet and an air outlet are machined in the precooler, a heat exchange pipe is installed in the precooler, and the two ends of the heat exchange pipe are connected with the air inlet and the air outlet respectively. A second gas-water separator is arranged in the evaporator at the position of an evaporating pipe of the second refrigerating machine, a second automatic blow-down valve is installed on the second gas-water separator, a first gas-water separator is arranged in the evaporator at the position of an evaporating pipe of the first refrigerating machine, and a first automatic blow-down valve is installed on the first gas-water separator.

Description

Technical Field

[0001] The utility model relates to the field of refrigeration equipment, and more specifically, to a dual-refrigeration compressor operation system for a refrigerant dryer. Background Art

[0002] As is well known, a refrigerant dryer is a purification device for removing moisture from compressed air and is usually used in industrial production and processing. In a single-refrigeration compressor refrigerant dryer, the low-pressure refrigerant vapor is compressed by a refrigeration compressor, condensed and liquefied, then throttled and depressurized to enter the evaporator for heat exchange with the compressed air, reducing the temperature of the compressed air, causing the water vapor therein to condense into water droplets and separate, thereby achieving the function of drying the compressed air. With the continuous development of industrial technology, the gas volume output by the refrigerant dryer has also increased, resulting in increased equipment energy consumption and frequent start-stop of the refrigerant dryer by personnel. Summary of the Invention

[0003] In order to overcome the deficiencies of the prior art, the utility model provides a dual-refrigeration compressor operation system for a refrigerant dryer, which reduces the energy consumption of the refrigerant dryer and improves work efficiency.

[0004] The technical solution adopted by the utility model to solve its technical problems is: a dual-refrigeration compressor operation system for a refrigerant dryer is provided with a second refrigerating machine. The second refrigerating machine is composed of a second water-cooled condenser, a second refrigeration compressor, a second refrigerant filter, a second hot gas bypass valve, and a second thermostatic expansion valve. Its characteristic is that a first refrigerating machine is arranged in parallel with the second refrigerating machine. The compressed air treatment capacity of the first refrigerating machine is twice that of the second refrigerating machine. The first refrigerating machine has the same structure as the second refrigerating machine. The first refrigerating machine is composed of a first refrigeration compressor, a first refrigerant filter, a first hot gas bypass valve, a first water-cooled condenser, and a first thermostatic expansion valve. The evaporator tubes of the first refrigerating machine and the second refrigerating machine are arranged in parallel in the evaporator. The evaporator is connected to the cavity of the pre-cooler. The pre-cooler is provided with an air inlet and an air outlet. Heat exchange tubes are installed in the pre-cooler. The two ends of the heat exchange tubes are respectively connected to the air inlet and the air outlet. A second gas-liquid separator is arranged in the evaporator at the position of the evaporator tube of the second refrigerating machine. An automatic blowdown valve II is installed on the second gas-liquid separator. A first gas-liquid separator is arranged in the evaporator at the position of the evaporator tube of the first refrigerating machine. An automatic blowdown valve I is installed on the first gas-liquid separator.

[0005] The beneficial effect of the utility model is that it can select a single compressor according to actual needs or switch to the simultaneous operation of two compressors to meet the needs under different working conditions, and has higher reliability, efficiency, flexibility and better energy consumption savings. Brief Description of the Drawings

[0006] The following further illustrates the utility model with reference to the drawings and embodiments.

[0007] Figure 1 Structural schematic diagram of the utility model.

[0008] In the figure, 1. Air inlet, 2. Evaporator, 3. Refrigeration compressor 1, 4. Refrigerant filter 1, 5. Hot gas bypass valve 1, 6. Water-cooled condenser 1, 7. Water-cooled condenser 2, 8. Refrigeration compressor 2, 9. Refrigerant filter 2, 10. Hot gas bypass valve 2, 11. Pre-cooler, 12. Air outlet, 13. Thermostatic expansion valve 1, 14. Thermostatic expansion valve 2, 15. Gas-water separator 2, 16. Automatic blowdown valve 2, 17. Gas-water separator 1, 18. Automatic blowdown valve 1, 19. Refrigerator 1, 20. Refrigerator 2. Specific embodiments

[0009] In the figure, the present utility model is provided with a refrigerator 20. The refrigerator 20 is composed of a water-cooled condenser 7, a refrigeration compressor 8, a refrigerant filter 9, a hot gas bypass valve 10, and a thermostatic expansion valve 14. A refrigerator 19 is arranged in parallel with the refrigerator 20. The compressed air processing capacity of the refrigerator 19 is twice that of the refrigerator 20. The refrigerator 19 has the same structure as the refrigerator 20 and is composed of a refrigeration compressor 3, a refrigerant filter 4, a hot gas bypass valve 5, a water-cooled condenser 6, and a thermostatic expansion valve 13. The evaporation pipes of the refrigerator 19 and the refrigerator 20 are arranged in parallel in the evaporator 2. The evaporator 2 is connected to the cavity of the pre-cooler 11. The pre-cooler 11 is provided with an air inlet 1 and an air outlet 12. Heat exchange pipes are installed in the pre-cooler 11, and both ends of the heat exchange pipes are respectively connected to the air inlet 1 and the air outlet 12. A gas-water separator 15 is arranged in the evaporator 2 at the position of the evaporation pipe of the refrigerator 20, and an automatic blowdown valve 16 is installed on the gas-water separator 15. A gas-water separator 17 is arranged in the evaporator 2 at the position of the evaporation pipe of the refrigerator 19, and an automatic blowdown valve 18 is installed on the gas-water separator 17.

[0010] High-temperature compressed air enters the pre-cooler 11 from the air inlet 1 of the cold dryer, exchanges heat with the low-temperature and dried compressed air to be sent out, reduces its temperature, and part of the water vapor condenses into liquid and is discharged; the pre-cooled compressed air enters the shell-side of the evaporator 2 and exchanges heat with the low-temperature and low-pressure refrigerant liquid in the tube-side, further reducing the temperature, and the water vapor therein condenses into water droplets and is discharged. During the production process, when one air compressor is started, only the second refrigeration compressor 8 operates, and the compressed air separates air and water droplets through the second air-water separator 15, and the water droplets are discharged out of the system by the second automatic drain valve 16; when two air compressors are started, only the first refrigeration compressor 3 operates, and the compressed air separates air and water droplets through the first air-water separator 17, and the water droplets are discharged out of the system by the first automatic drain valve 18; when three air compressors are started, the first refrigeration compressor 3 and the second refrigeration compressor 8 operate simultaneously, and the compressed air separates air and water droplets through the first air-water separator 17 and the second air-water separator 15, and the water droplets are discharged to the outside of the system by the first automatic drain valve 18 and the second automatic drain valve 16. The low-temperature and dried compressed air returns to the pre-cooler 11 to fully exchange heat energy with the humid and hot air entering from the air inlet 1. The low-temperature air is heated up in the pre-cooler 11, avoiding the condensation on the outer wall of the downstream compressed air conveying pipeline due to the too low outlet air temperature in summer. After the temperature rises, it is sent out of the cold dryer from the air outlet 12.

[0011] Operating principle of the first refrigeration compressor 3 of the present utility model:

[0012] The gaseous refrigerant is compressed by the first refrigeration compressor 3 to become a high-temperature and high-pressure gaseous refrigerant, enters the first water-cooled condenser 6 for heat dissipation, condenses and liquefies to form a high-pressure liquid refrigerant, removes impurities and moisture in the refrigerant through the first refrigerant filter 4, and then becomes a low-temperature and low-pressure liquid refrigerant after throttling and pressure reduction by the first thermostatic expansion valve 13, enters the evaporator 2 to exchange heat with the compressed air, absorbs the heat of the compressed air and evaporates into a gaseous refrigerant, and is then sucked back by the first refrigeration compressor 3 for re-compression to complete a refrigeration cycle. In the refrigeration cycle, the first hot gas bypass valve 5 automatically adjusts and controls the pressure in the tube-side of the evaporator according to the evaporation pressure situation, so as to ensure that the temperature of the compressed air after being cooled is not lower than 0 °C when the heat load of the compressed air decreases, preventing the condensed water from freezing and blocking the air path.

[0013] Operating principle of the second refrigeration compressor 8 of the present utility model:

[0014] The gaseous refrigerant is compressed by the second refrigeration compressor 8 to become a high-temperature and high-pressure gaseous refrigerant, enters the water-cooled condenser 7 to dissipate heat, condenses and liquefies to form a high-pressure liquid refrigerant. The impurities and moisture in the refrigerant are removed through the refrigerant filter 9, and then throttled and depressurized by the thermostatic expansion valve 14 to become a low-temperature and low-pressure liquid refrigerant. It enters the evaporator 2 to exchange heat with the compressed air, absorbs the heat of the compressed air and evaporates into a gaseous refrigerant, which is then sucked back by the second refrigeration compressor 8 for re-compression, completing a refrigeration cycle. In the refrigeration cycle, the hot gas bypass valve 10 automatically adjusts and controls the pressure inside the tube side of the evaporator according to the evaporation pressure situation. When the heat load of the compressed air decreases, it can ensure that the temperature of the compressed air after being cooled is not lower than 0 °C, preventing the condensate from freezing and blocking the air path.

Claims

1. A cold dryer dual refrigeration compressor operation system, provided with a second refrigeration machine, the second refrigeration machine is composed of a second water-cooled condenser, a second refrigeration compressor, a second refrigerant filter, a second hot gas bypass valve, and a second thermal expansion valve, wherein: A refrigerator 1 is arranged in parallel with the refrigerator 2. The compressed air processing capacity of the refrigerator 1 is twice that of the refrigerator 2. The refrigerator 1 has the same structure as the refrigerator 2. The refrigerator 1 is composed of a refrigeration compressor 1, a refrigerant filter 1, a hot gas bypass valve 1, a water-cooled condenser 1, and a thermal expansion valve 1. The evaporation tubes of the refrigerator 1 and the refrigerator 2 are arranged in parallel in the evaporator. The evaporator is connected to the cavity of the precooler. The precooler is processed with an air inlet and an air outlet. A heat exchange tube is installed in the precooler. Both ends of the heat exchange tube are respectively connected to the air inlet and the air outlet. An air-water separator 2 is arranged in the evaporator at the evaporation tube position of the refrigerator 2. An automatic drain valve 2 is installed on the air-water separator 2. An air-water separator 1 is arranged in the evaporator at the evaporation tube position of the refrigerator 1. An automatic drain valve 1 is installed on the air-water separator 1.

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