Freezing dryer with energy recovery function

Abstract

The invention belongs to the technical field of refrigeration dryers, and provides a refrigeration dryer with an energy recovery function, which comprises a shell, a compressor, a condenser, an evaporator and a gas-water separator are fixedly mounted in the shell, the compressor, the condenser and the evaporator are connected with one another, the evaporator is connected with the gas-water separator, a plate heat exchanger is fixedly mounted in the shell, and the plate heat exchanger is fixedly mounted in the shell. The plate heat exchanger is connected with the evaporator through a second connecting pipe and a third connecting pipe. Compared with the prior art, the system has the following beneficial effects that low-temperature compressed air and high-temperature compressed air entering the plate heat exchanger through the first air inlet pipe are subjected to heat exchange, the cooled compressed air is reused, the high-temperature compressed air can be cooled in advance, energy recycling is achieved, and energy is saved. And meanwhile, the temperature of exhausted gas can be increased, and the condensation phenomenon of a rear-end pipeline and gas utilization equipment is avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of cold dryers, and in particular relates to a cold dryer with an energy recovery function. Background Art

[0002] With the development of economy and the progress of society, energy conservation and recycling have become the common development direction of most products. Compressed air, as the second largest power source, cold dryer products used for compressed air purification have become an indispensable part of the industrial field.

[0003] A common cold dryer consists of a main evaporator to cool and remove water from the compressed air. The entire system includes a refrigeration compressor, a condenser, and a throttling expansion unit as a refrigeration cycle to provide cooling capacity for the evaporator. After the compressed air passes through the evaporator, the temperature is reduced to nearly 2°C, and the gaseous water in the compressed air is converted into liquid water and separated and drained, thereby obtaining dry and low-temperature compressed air.

[0004] Since the temperature of compressed air is relatively low after passing through the evaporator, after coming out from the air outlet, it passes through the compressed air pipeline and finally reaches the gas usage point. The low compressed air temperature will cause a temperature difference between the air pipeline and the environment, causing condensation on the outer wall of the pipeline. It will also cause condensation on the gas-using equipment at the gas usage point, affecting the use effect and service life of the equipment. Summary of the invention

[0005] The purpose of the present invention is to provide a cold dryer with energy recovery function, aiming to solve the technical problem in the prior art that the compressed air temperature is too low, causing a temperature difference between the air pipeline and the environment, resulting in damage to the equipment.

[0006] The present invention is implemented as follows: a cold dryer with energy recovery function includes a shell, a compressor, a condenser, an evaporator and an air-water separator are fixedly installed in the shell, the compressor, the condenser and the evaporator are connected to each other, the evaporator is connected to the air-water separator, a plate heat exchanger is fixedly installed in the shell, the plate heat exchanger is connected to the evaporator through a second connecting pipe and a third connecting pipe, the plate heat exchanger is connected to a first air inlet pipe and an exhaust pipe, and a cooling fan for dissipating heat from the condenser is arranged in the shell.

[0007] Further technical solution: the first air inlet pipe is connected to the second connecting pipe, the exhaust pipe is connected to the third connecting pipe, the compressed air enters the plate heat exchanger from the first air inlet pipe, and then enters the evaporator from the second connecting pipe, the compressed air returns to the plate heat exchanger from the evaporator through the third connecting pipe, and then is discharged through the exhaust pipe.

[0008] Further technical solution: two groups of first cooling chambers are fixedly installed in the shell, and the two groups of first cooling chambers are connected through multiple groups of first cooling pipes, one group of the first cooling chambers is connected to the second air inlet pipe, the second air inlet pipe extends out of the shell, a filter is provided at the end of the second air inlet pipe, and an air intake fan is fixedly installed in the second air inlet pipe, the first cooling chamber away from the second air inlet pipe is connected to the fourth connecting pipe, the end of the fourth connecting pipe away from the first cooling chamber is connected to the heat dissipation chamber, a groove is provided on the side wall of the heat dissipation chamber close to the condenser, and the heat dissipation fan is installed in the heat dissipation chamber.

[0009] Further technical solution: A second cooling chamber is fixedly installed in each of the two groups of the first cooling chambers, and the two groups of the second cooling chambers are connected by multiple groups of second cooling pipes. The second cooling pipes are located in the first cooling pipes, one group of the second cooling chambers is connected to the plate heat exchanger, and the other group of the second cooling chambers is connected to the exhaust pipe.

[0010] Further technical solution: The second cooling chamber away from the exhaust pipe is connected to a first connecting pipe, the first connecting pipe is connected to the plate heat exchanger, and the air enters the plate heat exchanger through a third connecting pipe and then enters the second cooling chamber from the first connecting pipe.

[0011] Further technical solution: Two groups of the first cooling chambers are fixedly installed with symmetrically distributed connecting boxes, each group of the first cooling pipes is provided with a water spray pipe, the water spray pipe is connected with the connecting boxes at both ends, multiple groups of connecting boxes are connected with each other, and a water pump is fixedly installed in the shell, and the water pump is connected with the connecting box.

[0012] Further technical solution: a collecting box is fixedly installed at the bottom of the shell, the water pump is connected to the collecting box, the collecting box is connected to the air-water separator through a condensed water collecting pipe, and the collecting box is connected to the first cooling chamber through a clean collecting pipe.

[0013] Further technical solution: A filter tank with a U-shaped cross-section is fixedly installed in the collection box, the filter tank is set at an angle with the horizontal plane, and a drainage pipe is connected to the collection box. The position where the drainage pipe is connected to the collection box is located at the lower end of the filter tank.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. After the high-temperature compressed air is cooled to low-temperature compressed air, the low-temperature compressed air enters the plate heat exchanger again through the third connecting pipe. At this time, the low-temperature compressed air exchanges heat with the high-temperature compressed air entering the plate heat exchanger through the first air inlet pipe. Then the low-temperature compressed air is discharged through the exhaust pipe. The high-temperature compressed air after the initial cooling enters the evaporator to continue cooling. By reusing the cooled compressed air, the high-temperature compressed air can be cooled in advance, realizing energy recovery and utilization, which can fully reduce the system refrigeration power output. At the same time, it can also increase the outlet temperature, avoid condensation in the rear-end pipelines and gas-using equipment, and increase the service life of the equipment.

[0016] 2. The low-temperature compressed air coming out of the plate heat exchanger after heat exchange with the high-temperature compressed air enters one of the second cooling chambers, and then flows to the other second cooling chamber through the second cooling pipe. Finally, the second cooling chamber is discharged through the exhaust pipe. When the low-temperature compressed air flows in the second cooling pipe, it exchanges heat with the air flowing in the first cooling pipe, thereby cooling the air entering the first cooling pipe from the outside. The cooled air enters the heat dissipation chamber and is blown toward the condenser. The low-temperature air further improves the cooling effect on the condenser, realizes energy recycling, and can further increase the temperature of the low-temperature compressed air, thereby increasing the service life of the equipment.

[0017] 3. The water pump continuously transports the condensed water in the collection box to the connecting box. The condensed water then enters the water spray pipe and is sprayed to the second cooling pipe through the atomizing nozzle. The second cooling pipe is cleaned by the condensed water to prevent dust from adhering to the second cooling pipe and affecting the heat exchange, thereby ensuring the heat exchange effect. At the same time, the condensed water can cool the second cooling pipe, further increasing the cooling effect on the air in the first cooling pipe. At the same time, part of the condensed water mist will be blown to the condenser with the air flow, further improving the cooling effect on the condenser. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0019] Figure 2 It is a schematic diagram of the structure inside the shell of the present invention from a first viewing angle.

[0020] Figure 3 It is a schematic structural diagram of the interior of the shell of the present invention from a second viewing angle.

[0021] Figure 4 It is a schematic structural diagram of the first cooling chamber in the present invention.

[0022] Figure 5 It is a schematic diagram of the cross-sectional structure of the first cooling tube in the present invention.

[0023] Figure 6It is a schematic cross-sectional structural diagram of the first cooling chamber in the present invention.

[0024] Figure 7 for Figure 5 A magnified schematic diagram of the A1 region in the middle.

[0025] Figure 8 for Figure 7 A magnified schematic diagram of the A2 region in the middle.

[0026] Fig. 9 It is a schematic diagram of the structure inside the collection box of the present invention.

[0027] In the attached figure: 1. shell; 2. compressor; 3. condenser; 4. evaporator; 5. air-water separator; 6. plate heat exchanger; 7. first air inlet pipe; 8. first connecting pipe; 9. second connecting pipe; 10. third connecting pipe; 11. first cooling chamber; 12. fourth connecting pipe; 13. exhaust pipe; 14. second air inlet pipe; 15. heat dissipation chamber; 16. heat dissipation fan; 17. first cooling pipe; 18. second cooling chamber; 19. second cooling pipe; 20. air inlet fan; 21. collecting box; 22. water pump; 23. connecting box; 24. water spray pipe; 25. atomizing nozzle; 26. cleaning collection pipe; 27. condensate collection pipe; 28. filter tank; 29. ​​drain pipe. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0029] The specific implementation of the present invention is described in detail below in conjunction with specific embodiments.

[0030] like Figure 1-Figure 3 As shown, a cold dryer with energy recovery function provided by the present invention comprises a shell 1, in which a compressor 2, a condenser 3, an evaporator 4 and a gas-water separator 5 are fixedly installed, the compressor 2, the condenser 3, and the evaporator 4 are connected to each other, and the evaporator 4 is connected to the gas-water separator 5. A plate heat exchanger 6 is fixedly installed in the shell 1, and the plate heat exchanger 6 is connected to the evaporator 4 through a second connecting pipe 9 and a third connecting pipe 10. A first air inlet pipe 7 and an exhaust pipe 13 are connected to the plate heat exchanger 6. A cooling fan 16 for dissipating heat from the condenser 3 is arranged in the shell 1, the first air inlet pipe 7 is connected to the second connecting pipe 9, and the exhaust pipe 13 is connected to the third connecting pipe 10. Compressed air enters the plate heat exchanger 6 from the first air inlet pipe 7, and then enters the evaporator 4 from the second connecting pipe 9. The compressed air returns to the plate heat exchanger 6 from the evaporator 4 through the third connecting pipe 10, and then is discharged through the exhaust pipe 13.

[0031] In actual application of this embodiment, high-temperature compressed air enters the plate heat exchanger 6 from the first air inlet pipe 7, and the high-temperature compressed air passes through the plate heat exchanger 6 and enters the evaporator 4 through the second connecting pipe 9. The high-temperature compressed air entering the evaporator 4 is cooled by the cooperation of the compressor 2, the condenser 3 and the evaporator 4. Condensed water is generated when the high-temperature compressed air is cooled. The condensed water is separated by the air-water separator 5. The high-temperature compressed air is cooled to low-temperature compressed air. The low-temperature compressed air enters the plate heat exchanger 6 again through the third connecting pipe 10. At this time, the low-temperature compressed air exchanges heat with the high-temperature compressed air entering the plate heat exchanger 6 through the first air inlet pipe 7. Then, the low-temperature compressed air is discharged through the exhaust pipe 13. The high-temperature compressed air after the initial cooling enters the evaporator 4 to continue to cool down. By reusing the cooled compressed air, the high-temperature compressed air can be pre-cooled, energy recovery is achieved, and the system refrigeration power output can be fully reduced. At the same time, the outlet temperature can be increased to avoid condensation in the rear-end pipelines and gas-using equipment, thereby increasing the service life of the equipment.

[0032] like Figure 4-Figure 8 As shown, a cold dryer with energy recovery function provided by the present invention, two groups of first cooling chambers 11 are fixedly installed in the shell 1, and the two groups of first cooling chambers 11 are connected through multiple groups of first cooling pipes 17, one group of the first cooling chambers 11 is connected with a second air inlet pipe 14, the second air inlet pipe 14 extends out of the shell 1, a filter is provided at the end of the second air inlet pipe 14, and an intake fan 20 is fixedly installed in the second air inlet pipe 14, the first cooling chamber 11 away from the second air inlet pipe 14 is connected with a fourth connecting pipe 12, and one end of the fourth connecting pipe 12 away from the first cooling chamber 11 is connected with a heat dissipation chamber 15, the side wall of the heat dissipation chamber 15 close to the condenser 3 is provided with a groove, and the heat dissipation fan 16 is installed in the heat dissipation chamber 15.

[0033] Specifically, the two groups of first cooling chambers 11 are fixedly installed with second cooling chambers 18, and the two groups of second cooling chambers 18 are connected through multiple groups of second cooling pipes 19. The second cooling pipes 19 are located in the first cooling pipes 17, one group of second cooling chambers 18 is connected to the plate heat exchanger 6, and the other group of second cooling chambers 18 is connected to the exhaust pipe 13.

[0034] Specifically, the second cooling chamber 18 away from the exhaust pipe 13 is connected to the first connecting pipe 8 , which is connected to the plate heat exchanger 6 . The air enters the plate heat exchanger 6 through the third connecting pipe 10 and then enters the second cooling chamber 18 from the first connecting pipe 8 .

[0035] In actual application of this embodiment, the air intake fan 20 and the heat dissipation fan 16 are turned on at the same time, and the air enters one group of the first cooling chambers 11 from the second air intake pipe 14 after being filtered, and then the air moves along the first cooling pipe 17 to another group of the first cooling chambers 11, and finally the air enters the heat dissipation chamber 15 through the fourth connecting pipe 12, and the heat dissipation fan 16 pushes the air in the heat dissipation chamber 15 to blow toward the condenser 3 for heat dissipation. By turning on the air intake fan 20 and the heat dissipation fan 16 at the same time, the air flow speed is accelerated, thereby improving the cooling effect on the condenser 3;

[0036] The low-temperature compressed air coming out of the plate heat exchanger 6 and exchanging heat with the high-temperature compressed air enters one of the second cooling chambers 18 through the first connecting pipe 8, and then flows through the second cooling pipe 19 to another group of second cooling chambers 18. Finally, the second cooling chamber 18 is discharged through the exhaust pipe 13. When the low-temperature compressed air flows in the second cooling pipe 19, it exchanges heat with the air flowing in the first cooling pipe 17, thereby cooling the air entering the first cooling pipe 17 from the outside. The cooled air enters the heat dissipation chamber 15 and is blown toward the condenser 3. The cooling effect on the condenser 3 is further improved by the low-temperature air, thereby realizing energy recovery and utilization, and can further increase the temperature of the low-temperature compressed air, thereby increasing the service life of the equipment.

[0037] like Figure 4-Figure 9 As shown, a cold dryer with energy recovery function provided by the present invention, two groups of first cooling chambers 11 are fixedly installed with symmetrically distributed connecting boxes 23, each group of first cooling pipes 17 is provided with a water spray pipe 24, the water spray pipe 24 is connected with the connecting boxes 23 at both ends, and multiple groups of connecting boxes 23 are connected with each other, and a water pump 22 is fixedly installed in the shell 1, and the water pump 22 is connected with the connecting box 23.

[0038] Specifically, a collecting box 21 is fixedly installed at the bottom of the shell 1, the water pump 22 is connected to the collecting box 21, the collecting box 21 is connected to the gas-water separator 5 through the condensed water collecting pipe 27, and the collecting box 21 is connected to the first cooling chamber 11 through the cleaning collecting pipe 26.

[0039] Specifically, a filter tank 28 with a U-shaped cross section is fixedly installed in the collection box 21 , and the filter tank 28 is set at an angle with the horizontal plane. A drainage pipe 29 is connected to the collection box 21 , and the position where the drainage pipe 29 is connected to the collection box 21 is located at the lower end of the filter tank 28 .

[0040] In actual application of this embodiment, the condensed water separated by the gas-water separator 5 enters the collection box 21 through the condensed water collection pipe 27, and the condensed water entering the collection box 21 is filtered through the filter tank 28. When the water level in the collection box 21 reaches or exceeds the set water level, the water pump 22 continuously transports the condensed water in the collection box 21 to the connecting box 23, and then the condensed water enters the water spray pipe 24 and is sprayed to the second cooling pipe 19 through the atomizing nozzle 25. The second cooling pipe 19 is cleaned by the condensed water to prevent dust from adhering to the second cooling pipe 19 and affecting the heat exchange, thereby ensuring the heat exchange effect. At the same time, the condensed water can cool the second cooling pipe 19. , further increasing the cooling effect on the air in the first cooling pipe 17, and at the same time, part of the condensed water mist will be blown to the condenser 3 along with the air flow, further improving the cooling effect on the condenser 3, and the condensed water will be gathered in the first cooling chamber 11 and returned to the collection box 21 through the clean collection pipe 26. A filter net is provided at the end of the clean collection pipe 26. When the water level in the collection box 21 reaches the height of the drain pipe 29, the condensed water will be discharged through the drain pipe 29. At the same time, due to the impact of water flow and the effect of gravity, the impurities on the filter tank 28 will move to the water inlet end of the drain pipe 29, and the impurities can be discharged at the same time when the drain pipe 29 is drained.

[0041] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

[0042] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A cold dryer with energy recovery function, comprising a housing (1), characterized in that: A compressor (2), a condenser (3), an evaporator (4) and a gas-water separator (5) are fixedly installed in the shell (1); the compressor (2), the condenser (3) and the evaporator (4) are connected to each other; the evaporator (4) is connected to the gas-water separator (5); a plate heat exchanger (6) is fixedly installed in the shell (1); the plate heat exchanger (6) is connected to the evaporator (4) via a second connecting pipe (9) and a third connecting pipe (10); a first air inlet pipe (7) and an air exhaust pipe (13) are connected to the plate heat exchanger (6); and a cooling fan (16) for dissipating heat from the condenser (3) is provided in the shell (1).

2. The cold dryer with energy recovery function according to claim 1, characterized in that: The first air inlet pipe (7) is connected to the second connecting pipe (9), and the exhaust pipe (13) is connected to the third connecting pipe (10). The compressed air enters the plate heat exchanger (6) from the first air inlet pipe (7), and then enters the evaporator (4) from the second connecting pipe (9). The compressed air returns from the evaporator (4) to the plate heat exchanger (6) through the third connecting pipe (10), and then is discharged through the exhaust pipe (13).

3. The cold dryer with energy recovery function according to claim 1, characterized in that: Two groups of first cooling chambers (11) are fixedly installed in the shell (1), and the two groups of first cooling chambers (11) are connected through multiple groups of first cooling pipes (17), one of which is connected to a second air inlet pipe (14), the second air inlet pipe (14) extends out of the shell (1), a filter is provided at the end of the second air inlet pipe (14), and an air intake fan (20) is fixedly installed in the second air inlet pipe (14), the first cooling chamber (11) away from the second air inlet pipe (14) is connected to a fourth connecting pipe (12), and one end of the fourth connecting pipe (12) away from the first cooling chamber (11) is connected to a heat dissipation chamber (15), a groove is provided on the side wall of the heat dissipation chamber (15) close to the condenser (3), and a heat dissipation fan (16) is installed in the heat dissipation chamber (15).

4. The cold dryer with energy recovery function according to claim 3, characterized in that: A second cooling chamber (18) is fixedly installed in each of the two groups of the first cooling chambers (11); the two groups of the second cooling chambers (18) are connected via a plurality of groups of second cooling pipes (19); the second cooling pipes (19) are located in the first cooling pipes (17); one group of the second cooling chambers (18) is connected to the plate heat exchanger (6), and the other group of the second cooling chambers (18) is connected to the exhaust pipe (13).

5. The cold dryer with energy recovery function according to claim 4, characterized in that: A second cooling chamber (18) away from the exhaust pipe (13) is connected to a first connecting pipe (8), the first connecting pipe (8) being connected to the plate heat exchanger (6), and air enters the plate heat exchanger (6) through a third connecting pipe (10) and then enters the second cooling chamber (18) from the first connecting pipe (8).

6. The cold dryer with energy recovery function according to claim 3, characterized in that: Symmetrically distributed connecting boxes (23) are fixedly installed in both groups of the first cooling chambers (11), a water spray pipe (24) is provided in each group of the first cooling pipes (17), the water spray pipe (24) is connected to the connecting boxes (23) at both ends, and multiple groups of connecting boxes (23) are connected to each other. A water pump (22) is fixedly installed in the shell (1), and the water pump (22) is connected to the connecting box (23).

7. The cold dryer with energy recovery function according to claim 6, characterized in that: A collection box (21) is fixedly mounted on the bottom of the shell (1); the water pump (22) is connected to the collection box (21); the collection box (21) is connected to the gas-water separator (5) via a condensed water collection pipe (27); and the collection box (21) is connected to the first cooling chamber (11) via a clean collection pipe (26).

8. The cold dryer with energy recovery function according to claim 7, characterized in that: A filter tank (28) with a U-shaped cross section is fixedly installed in the collection box (21), and an angle is set between the filter tank (28) and the horizontal plane. A drainage pipe (29) is connected to the collection box (21), and the position where the drainage pipe (29) is connected to the collection box (21) is located at the lower end of the filter tank (28).

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