JP2007016700A - Package type compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a package type compressor having easy construction for efficiently lowering the temperature of compressed air flowing into a refrigerating air dryer. <P>SOLUTION: Compressed air produced by a compressor body 2 flows via a first pipe 7 into an air tank 3 and is supplied from an air outlet 9 via a second pipe 8 to the outside of a case 1. The refrigerating air dryer 4 is provided on the midway of the second pipe 8. The compressed air in the second pipe 8 is cooled by refrigerant in the refrigerating air dryer 4, dehumidified and supplied to the air outlet 9. A second pipe 8A located at the front stage of the refrigerating air dryer 4 and a second pipe 8B located at the rear stage of the refrigerating air dryer are communicated with an outer tube 12b and an inner tube 12a of a double tube part 12, respectively, and heat-exchanged with the double tube part 12 to cool the compressed air flowing into the refrigerating air dryer 4 down to a lower temperature. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

 The present invention relates to a packaged compressor provided with a refrigeration air dryer.

  In recent years, dry air containing no moisture is required as compressed air generated by a compressor, and the demand for the air is increasing. As a means for producing dry air, a form using a refrigeration type air dryer is mainly used, and the principle is that air is cooled by a refrigerant, moisture in the air is condensed, and the water droplets are removed by drying. It generates air.

  As compressors, the need for packaged compressors is increasing, and the proportion of those equipped with refrigeration air dryers is increasing. This is because the package type compressor equipped with a refrigeration air dryer has an integrated structure, so the installation space can be reduced and the size and weight can be reduced compared to a device that installs the compressor and the refrigeration air dryer separately. Because you can.

  By the way, the compressed air discharged from the compressor main body has a significantly increased air temperature due to the influence of compression, and becomes a high temperature. The refrigeration type air dryer has a restriction on the inlet temperature corresponding to the cooling capacity with respect to the air to be sent, and it is necessary to consider not to exceed the upper limit temperature. If the inlet temperature exceeds the upper limit, air cooling by the refrigerant becomes insufficient, and compressed air with a poor dehumidification rate is discharged. Therefore, it has been considered to provide a cooling means in order to maintain an appropriate inlet temperature to the refrigeration air dryer.

  As package type compressors provided with cooling means for compressed air flowing into a refrigeration air dryer, there are those described in Patent Document 1 and Patent Document 2. In Patent Document 1, a part of the refrigerant pipe of the refrigeration air dryer is disposed in the vicinity of the air compression part, or a part of the external discharge pipe located on the downstream side of the refrigeration air dryer is in the vicinity of the air compression part. A device that cools the air in the air compressing section by disposing it is disclosed.

In Patent Document 2, at least part of a pipe that sends compressed air from a cooler to an air dryer is piped into a drain pipe that drains the water removed by the air dryer, and the compressed air in the pipe is reduced by water flowing in the drain pipe. What is cooled is disclosed.
JP 2004-300955 A JP-A-10-205453

  In the one described in Patent Document 1, it is necessary to position the low-temperature fluid piping as close as possible to a portion to be cooled such as an air compression unit, but the air compression unit generates vibration when operated. Therefore, in order to avoid the influence, at least a distance corresponding to the vibration displacement must be secured. Considering that the shape of the low-temperature fluid piping for the part to be cooled becomes complicated, a certain gap distance is required to ensure assemblability. However, if these distances are large, the heat exchange characteristics deteriorate and conversely the cooling effect decreases.

  Further, since the low-temperature fluid pipe is extended to the air compression section, the temperature rises by that amount until the low-temperature fluid reaches each cooling part, and loss occurs. Therefore, it is desirable for the low-temperature fluid piping to shorten the distance to the cooling part such as the air compression part as much as possible to reduce the loss of temperature rise, but in the case of cooling the high pressure compression part via the low pressure compression part of the air compression part In this case, the piping must be long, and the temperature of the low-temperature fluid rises due to heat exchange in the low-temperature compression section, so that the cooling effect in the high-pressure compression section cannot be expected so much.

  On the other hand, in the one disclosed in Patent Document 2, the drain water dripped from the thin pipe at the upper part of the large-diameter portion is applied to the inner pipe, but mostly flows down the inner wall of the large-diameter portion. The pipe cannot be cooled by water, and the cooling effect cannot be expected so much. If the large diameter part is filled with drain water, the water cooling effect on the pipe inside it can be expected, but the drain discharger provided at the end of the drain pipe is a float type, and a certain amount of drain water in the drain discharger If it exceeds, the drain water level will not rise beyond the capacity of the discharger.

  Further, when the drain water exchanges heat with the pipe in the large diameter portion, there is a possibility that the internal pressure fluctuation in the drain pipe is caused when the drain water evaporates. Usually, fluctuations in pressure in the drain piping of a refrigeration air dryer may adversely affect the operation of the drain separator, so this must be avoided.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a package type compressor that is easy to configure and that can efficiently lower the inlet temperature of compressed air to a refrigeration air dryer. There is.

 In order to solve the above problems, a packaged compressor according to the present invention is produced by a compressor main body that takes in outside air and generates compressed air, and is connected to the compressor main body via a first pipe. An air tank for storing the compressed air, a discharge port connected to the air tank via a second pipe and supplying compressed air to the outside, and a second part of the second pipe. A refrigeration air dryer that cools and dehumidifies the compressed air in the pipe with a refrigerant; and at least one of the compressed air in the second pipe or the compressed air in the first pipe that is positioned upstream of the refrigeration air dryer and the refrigeration air dryer And a double pipe section that exchanges heat with the compressed air in the second pipe located in the subsequent stage.

 A packaged compressor according to the present invention is connected to a compressor main body that takes in outside air to generate compressed air, and is connected to the compressor main body via a first pipe, and stores the compressed air generated by the compressor main body. An air tank, a discharge port that is connected to the air tank via a second pipe and supplies compressed air to the outside, and is provided at an intermediate position of the second pipe, and the compressed air in the second pipe is refrigerated. A refrigeration air dryer that cools and dehumidifies, and a refrigerant in a refrigerant pipe of the refrigeration air dryer and at least one of compressed air in a second pipe or a compressed air in the first pipe that is positioned downstream of the refrigeration air dryer And a double pipe part for heat exchange.

 According to the present invention, at least one of the high-temperature compressed air in the second pipe or the high-temperature compressed air in the first pipe located in the first stage of the refrigeration air dryer and the second in the rear stage of the refrigeration air dryer. The simple structure that exchanges heat between the low-temperature compressed air in the pipe and the low-temperature refrigerant in the refrigerant pipe of the refrigeration air dryer through the double pipe section can reduce the inlet temperature of the compressed air to the refrigeration air dryer. it can. In addition, the inner pipe and the outer pipe of the double pipe portion are filled with low-temperature or high-temperature fluid, respectively, so that heat can be exchanged efficiently.

  FIG. 1 is a cross-sectional view showing a packaged compressor according to a first embodiment of the present invention. In FIG. 1, a package type compressor includes a compressor body 2 that takes in air from outside to generate compressed air, an air tank 3 that stores compressed air, and a refrigeration type that cools and dehumidifies the compressed air with a refrigerant. The air dryer 4 is accommodated. The air tank 3 is installed in the lower part of the case 1, the compressor main body 2 is installed directly or via a support frame provided separately above the air tank 3, and the refrigeration air dryer 4 is installed above the compressor main body 2. Has been.

  The compressor main body 2 is constituted by, for example, a piston reciprocating or piston swinging compressor driven by a motor 5 via a belt 6, and is a low pressure that compresses by taking in outside air from an air intake port 2a. The compression part 2b and the high pressure compression part 2c which further compresses the air compressed by this low pressure compression part 2b are provided.

  The high pressure compressor 2c is connected to the air tank 3 installed below the compressor body 2 via the first pipe 7, and the compressed air generated by the high pressure compressor 2c is contained in the air tank 2. It is to be stored. The air tank 3 is connected to a discharge port 9 provided on the side surface of the case 1 via a second pipe 8 and supplies compressed air inside to the outside of the case 1 as product air.

  Here, an intermediate portion of the second pipe 8 from the air tank 3 to the discharge port 9 is led to a refrigeration air dryer 4 disposed above the case 1. The refrigeration air dryer 4 includes a refrigerant pipe 4a through which the refrigerant circulates, a refrigerant compressor 4b that compresses the refrigerant in the refrigerant pipe 4a, and a cooling fan 4c. And the heat exchange part 11 is comprised, and the refrigerant | coolant in the refrigerant | coolant piping 4a circulates as shown by the arrow.

  The cooling condensing unit 10 has a configuration in which, for example, the refrigerant pipe 4a meanders and a cooling fin (not shown) is provided on the outer periphery of the pipe, and the high-pressure refrigerant compressed by the refrigerant compressor 4b is supplied by the cooling fan 4c. The refrigerant in the refrigerant pipe 4a is liquefied by being cooled. In addition, a second pipe 8 is disposed in the vicinity of the cooling condensing unit 10, and the second pipe cooled by a double pipe unit 12 described later by heat generated when the refrigerant is liquefied in the cooling condensing unit 10. The compressed air flowing through the inside 8 is warmed.

  The heat exchanging unit 11 is in a midway position located downstream (downstream) from the cooling condensing unit 10 in the path through which the refrigerant circulates, and at least a part of the refrigerant pipe 4a and the second pipe 8 are close to each other. The high-temperature compressed air flowing through the second pipe 8 is cooled by the heat of vaporization of the liquefied refrigerant flowing through the refrigerant pipe 4a.

  Further, a drain separator 13 is provided in the middle of the second pipe 8 in the heat exchanging section 11, and when the second pipe 8 is cooled and moisture in the compressed air inside condenses on the inner wall, the drain is separated. It flows into the separator 13 and is discharged to a drain trap 15 provided outside the case 1 through a pipe 14. The drain trap 15 is a float type, and when drain water flows in and the water level exceeds the upper limit, the drain trap 15 is automatically discharged to the outside.

  The inside of the heat exchange unit 11 is covered with a heat insulating material (not shown), and the outer periphery of the pipe 14 and the second pipe 8 drawn out from the heat exchange unit 11 are each configured to prevent condensation. Therefore, the heat insulating materials 16a and 16b are covered.

  The second pipe 8 drawn out from the heat exchange section 11 of the refrigeration air dryer 4 communicates with the inner pipe 12a of the double pipe section 12, and after passing through the inner pipe 12a, the case 1 is discharged from the discharge port 9. Supply dried compressed air as product air to the outside. On the other hand, the outer pipe 12 b of the double pipe portion 12 is communicated with a second pipe 8 that extends from the air tank 3 to the refrigeration air dryer 4. The double pipe portion 12 is formed of copper or the like excellent in heat exchangability and workability, and has a diameter larger than that of a normal pipe, but has a simple structure as a device and good assemblability.

  Therefore, the double pipe portion 12 is located at the front stage (upstream side) of the refrigeration air dryer 4 and at least a part of the second pipe 8A through which high-temperature compressed air flows and the rear stage (downstream side) of the refrigeration air dryer 4. And at least a part of the second pipe 8B through which low-temperature dry compressed air flows are combined, and heat exchange is efficiently performed by the temperature difference between the compressed air flowing in the outer pipe 12b and the compressed air flowing in the inner pipe 12a. Will be done.

  That is, the high-temperature compressed air compressed by the compressor body 2 is cooled to an appropriate temperature below the upper limit of the intake air temperature in the double pipe portion 12 provided in the middle of the second pipe 8A, and is refrigerated. It will be guided to the air dryer 4. The compressed air in the second pipe 8 that has flowed into the refrigeration air dryer 4 is heated to an appropriate temperature by the cooling condensing unit 10 of the refrigeration air dryer 4 and guided to the heat exchanging unit 11. The compressed air in the second pipe 8 is cooled and dehumidified by the heat of vaporization of the refrigerant in the refrigerant pipe 4a, discharged from the refrigeration air dryer 4, and flows in the second pipe 8B. Then, the compressed air in the second pipe 8B located at the subsequent stage is warmed by exchanging heat with the compressed air in the second pipe 8A located at the front stage of the refrigeration air dryer 4 in the double pipe portion 12. It is supplied from the discharge port 9.

  Accordingly, the hot compressed air discharged from the air tank 3 is cooled to an appropriate temperature in the double pipe portion 12 and then flows into the refrigeration air dryer 4. Can be made below the upper limit temperature. The compressed air discharged from the refrigeration air dryer 4 can be supplied as product air raised to an appropriate temperature. Moreover, these heat exchanges can be performed by the double pipe part 12 which is easy to configure and excellent in assemblability and heat exchange, and the inner pipe 12a and the outer pipe 12b are respectively filled with compressed air. Therefore, by changing the axial length and changing the distance for heat exchange, heat can be exchanged efficiently, and the inlet temperature of the refrigeration air dryer 4 and the temperature of the product air can be arbitrarily set. Furthermore, since there is no factor causing internal pressure fluctuation in the drain water discharge process from the drain separator 13 to the drain trap 15, the malfunction does not occur in the drain separator 13.

  In addition, if the compressed air in the 2nd piping 8 cooled by the double pipe part 12 can be set to a suitable temperature as the temperature which flows into the refrigerating type air dryer 4, the 2nd piping 8 is not necessarily the cooling condensation part 10. There is no need to warm up. Further, the communication configuration of the second pipes 8A and 8B located in the front stage and the rear stage of the refrigeration air dryer 4 with respect to the inner pipe 12a and the outer pipe 12b of the double pipe portion 12 can be reversed from the above embodiment. If the configuration is such that low-temperature compressed air is allowed to flow through the inner pipe 12a and high-temperature compressed air is allowed to flow through the outer pipe 12b, it is possible to omit the configuration of providing a heat insulating material for preventing condensation in the double pipe portion 12.

  FIG. 2 is a sectional view showing a packaged compressor according to a second embodiment of the present invention. In FIG. 2, this embodiment is different from the first embodiment in that the heat exchange in the double pipe portion 22 is performed in the second stage, which is located after the compressed air in the first pipe 7 and the refrigeration air dryer 4. The configuration is such that the compressed air in the pipe 8B is used.

That is, the double pipe portion 22 is communicated with the outer pipe 22b of the middle portion of the first pipe 7 communicated with the air tank 5 from the high pressure compression section 2c of the compressor body 2, and the inner pipe 22a is a refrigeration type. The intermediate part of the second pipe 8B in the subsequent stage drawn out from the heat exchange unit 11 of the air dryer 4 is communicated, and the hot compressed air in the first pipe 7 and the low-temperature compressed air in the second pipe 8 are heated. It is to be exchanged.
As a result, the compressed air in the first pipe 7 is cooled by heat exchange and flows into the air tank 3, and enters the refrigeration air dryer 4 at a low temperature via the second pipe 8A in the previous stage. It will be. Further, the compressed air in the second pipe 8B located at the rear stage of the refrigeration air dryer 4 is heated in the double pipe portion 22 and supplied as product air from the discharge port 9.

  If it does in this way, in addition to the effect of 1st Embodiment, since the compressed air which is discharged | emitted from the high voltage | pressure compression part 2c and is in the highest temperature state can be cooled, the efficiency of heat exchange can be improved. .

  FIG. 3 is a cross-sectional view showing a packaged compressor according to a third embodiment of the present invention. In FIG. 3, this embodiment is different from the first embodiment in that, in addition to the configuration of the first embodiment, the compressed air in the first pipe 7 and the refrigeration are the second embodiment. There is a configuration in which heat is exchanged between the compressed air in the second pipe 8B located at the rear stage of the air dryer 4 by the double pipe portion 22.

  That is, the first and second double pipe parts 12 and 22 are provided, and the first double pipe part 12 has an outer pipe 12b of the second pipe 8A located in the front stage of the refrigeration air dryer 4. The inner pipe 12a communicates with an intermediate portion of the second pipe 8B located at the rear stage of the refrigeration air dryer 4 and communicates with the compressed air in the second pipes 8A and 8B. The second double pipe portion 22 has an outer pipe 22b communicated with a middle portion of the first pipe 7, and an inner pipe 22a located in the middle of the second pipe 8B located at the rear stage of the refrigeration air dryer 4. And the compressed air in each pipe 7.8B exchanges heat.

  As a result, the compressed air in the first pipe 7 is cooled by the second double pipe portion 22 and flows into the air tank 3, and the first air is supplied from the air tank 3 through the second pipe 8 </ b> A in the previous stage. The refrigeration air dryer 4 is cooled by the double pipe portion 12 and enters the refrigeration air dryer 4 at a low temperature. The compressed air in the second pipe 8B located at the rear stage of the refrigeration air dryer 4 is warmed in the first double pipe part 12 and the second double pipe part 22, respectively, as product air from the discharge port 9. Will be supplied.

  In this way, in addition to the effects of the first and second embodiments, the compressed air discharged from the high-pressure compressor 2c can be cooled in two stages, so that the efficiency of heat exchange can be further increased. it can.

  FIG. 4 is a cross-sectional view showing a packaged compressor according to a fourth embodiment of the present invention. In FIG. 4, the present embodiment is different from the first embodiment in that the heat exchange in the double pipe portion 32 is positioned upstream of the refrigerant in the refrigerant pipe 4 a of the refrigeration air dryer 4 and the refrigeration air dryer 4. There is a configuration in which the compressed air in the second pipe 8A is used.

That is, the double pipe portion 32 is communicated with the middle part of the second pipe 8 </ b> A whose outer pipe 32 b extends from the air tank 3 to the refrigeration air dryer 4, and the inner pipe 32 a finishes cooling the compressed air in the refrigeration air dryer 4. The high-temperature compressed air flowing in the second pipe 8A and the low-temperature refrigerant flowing in the refrigerant pipe 4a communicated with the intermediate part of the refrigerant pipe 4a and heat exchange is performed.
Thereby, the compressed air in the second pipe 8 </ b> A is cooled by heat exchange and enters the refrigeration air dryer 4 at a low temperature. In this way, in addition to the ease of configuration for exchanging heat with the double pipe portion 32 and the high efficiency of exchanging heat by filling the inner pipe 32a and the outer pipe 32b of the double pipe portion 32 respectively, Since the high-temperature compressed air can be cooled by the refrigerant in a lower temperature state than the second pipe 8B, the efficiency of heat exchange can be further increased.

  FIG. 5 is a cross-sectional view showing a packaged compressor according to a fifth embodiment of the present invention. In FIG. 5, the present embodiment is different from the fourth embodiment in that heat exchange in the double pipe portion 42 is performed by using the refrigerant in the refrigerant pipe 4 a of the refrigeration air dryer 4 and the compressed air in the first pipe 7. It is in the place made into the structure performed by.

That is, the double pipe portion 42 has an outer pipe 42 b communicated with the middle part of the first pipe 7 from the compressor body 2 to the air tank 3, and the inner pipe 42 a is a middle part of the refrigerant pipe 4 a of the refrigeration air dryer 4. The high-temperature compressed air flowing through the first pipe 7 and the low-temperature refrigerant flowing through the refrigerant pipe 4a are heat-exchanged.
As a result, the compressed air in the first pipe 7 is cooled by heat exchange and flows into the air tank 3, and enters the refrigeration air dryer 4 at a low temperature via the second pipe 8A in the previous stage. It will be. If it does in this way, in addition to the effect of 4th Embodiment, since the compressed air in the highest temperature state can be cooled with the refrigerant in the lowest temperature state, the efficiency of heat exchange can be improved further. .

  FIG. 6 is a cross-sectional view showing a packaged compressor according to a sixth embodiment of the present invention. In FIG. 6, this embodiment differs from the fourth embodiment in that the refrigerant in the refrigerant pipe 4a of the refrigeration air dryer 4 is the fifth embodiment in addition to the configuration of the fourth embodiment. A configuration for exchanging heat with the compressed air in the first pipe 7 is provided.

  That is, the first and second double pipe portions 32, 42 are provided, and the first double pipe portion 32 has an outer pipe 32 b of the second pipe 8 </ b> A located in the front stage of the refrigeration air dryer 4. The second pipe 8A, 4a has a configuration in which heat is exchanged between the compressed air in the second pipes 8A and 4a, the inner pipe 32a is in communication with the middle part of the refrigerant pipe 4a of the refrigeration air dryer 4, and the refrigerant is exchanged in heat. In the double pipe portion 42, the outer pipe 42 b is communicated with the middle part of the first pipe 7, and the inner pipe 42 a is communicated with the middle part of the refrigerant pipe 4 a of the refrigeration air dryer 4. The compressed air and the refrigerant exchange heat.

  Accordingly, the compressed air in the first pipe 7 is cooled by the second double pipe portion 42 and flows into the air tank 3, and the first two pipes 8 </ b> A from the air tank 3 through the second pipe 8 </ b> A in the previous stage. It is cooled by the heavy pipe portion 32 and enters the refrigeration air dryer 4 at a low temperature.

  In this way, in addition to the effects of the fourth and fifth embodiments, the compressed air discharged from the high-pressure compressor 2c can be cooled in two stages, so that the efficiency of heat exchange can be further increased. it can.

It is sectional drawing which shows the package type compressor concerning 1st Embodiment of this invention. It is sectional drawing which shows the package type compressor concerning 2nd Embodiment of this invention. It is sectional drawing which shows the package type compressor concerning 3rd Embodiment of this invention. It is sectional drawing which shows the package type compressor concerning 4th Embodiment of this invention. It is sectional drawing which shows the package type compressor concerning 5th Embodiment of this invention. It is sectional drawing which shows the package type compressor concerning 6th Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Case 2 ... Compressor main body 2a ... Air intake 2b ... Low pressure compression part 2c ... High pressure compression part 3 ... Air tank 4 ... Refrigeration air dryer 4a ... Refrigerant piping 4b ... Refrigerant compressor 4c ... Cooling fan 5 ... Motor 6 ... Belt 7 ... 1st piping 8 ... 2nd piping 8A ... 2nd piping 8B of the front stage 2nd piping 9 of the back | latter stage ... Discharge port 10 ... Cooling condensing part 11 ... Heat exchange part 12, 22, 32, 42 ... Double pipe parts 12a, 22a, 32a, 42a ... Inner pipes 12b, 22b, 32b, 42b ... Outer pipe 13 ... Drain separator 14 ... Pipe 15 ... Drain traps 16a, 16b ... Thermal insulation

Claims (8)

 A compressor main body that takes in outside air to generate compressed air, an air tank that is connected to the compressor main body via a first pipe and stores the compressed air generated by the compressor main body, and an air tank A discharge port that is connected via a second pipe and supplies compressed air to the outside, and a refrigerating type that is provided in the middle of the second pipe and cools and dehumidifies the compressed air in the second pipe with a refrigerant. An air dryer, and at least one of the compressed air in the second pipe or the compressed air in the first pipe located in the preceding stage of the refrigeration air dryer, and the second pipe in the latter stage of the refrigeration air dryer A package-type compressor comprising: a double pipe portion that exchanges heat with the compressed air.   The double pipe section is configured to exchange heat between the compressed air in the second pipe located in the front stage of the refrigeration air dryer and the compressed air in the second pipe located in the rear stage of the refrigeration air dryer. The package type compressor according to claim 1, wherein  The said double pipe part has the structure which heat-exchanges the compressed air in the said 2nd piping located in the back | latter stage of the said refrigerating type air dryer with the compressed air in the said 1st piping. The package type compressor according to 1.  The double pipe section includes first and second double pipe sections, and the first double pipe section includes compressed air in the second pipe located in the front stage of the refrigeration air dryer. The second double pipe portion is configured to exchange heat with the compressed air in the second pipe located at the rear stage of the refrigeration air dryer, and the second double pipe section is connected to the compressed air in the first pipe and the refrigeration. 2. The package type compressor according to claim 1, wherein the package type compressor has a configuration for exchanging heat with the compressed air in the second pipe located at the rear stage of the air dryer.  A compressor main body that takes in outside air to generate compressed air, an air tank that is connected to the compressor main body via a first pipe and stores the compressed air generated by the compressor main body, and an air tank A discharge port that is connected via a second pipe and supplies compressed air to the outside, and a refrigerating type that is provided in the middle of the second pipe and cools and dehumidifies the compressed air in the second pipe with a refrigerant. Heat exchange is performed between the air dryer, the refrigerant in the refrigerant pipe of the refrigeration air dryer, and the compressed air in the second pipe or the compressed air in the first pipe that is positioned in front of the refrigeration air dryer. A package-type compressor comprising a double pipe portion;  The double pipe section has a configuration in which heat is exchanged between the refrigerant in the refrigerant pipe of the refrigeration air dryer and the compressed air in the second pipe located in a preceding stage of the refrigeration air dryer. 5. The packaged compressor according to 5.   The packaged compressor according to claim 5, wherein the double pipe portion has a configuration for exchanging heat between refrigerant in a refrigerant pipe of the refrigeration air dryer and compressed air in the first pipe.  The double pipe section includes first and second double pipe sections, and the first double pipe section is located in a stage upstream of the refrigerant in the refrigerant pipe of the refrigeration air dryer and the refrigeration air dryer. The second double pipe portion is configured to exchange heat with the compressed air in the second pipe. The refrigerant in the refrigerant pipe of the refrigeration air dryer and the compressed air in the first pipe. The package type compressor according to claim 5, wherein the package type compressor is configured to exchange heat with each other.

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