JP6427509B2 - Compressed air dehumidifier - Google Patents

Description

  The present invention dehumidifies the primary side compressed air introduced from a compressed air device such as a compressor that generates compressed air by heat exchange, and supplies the dehumidified secondary side compressed air to a pneumatic device. It relates to the device.

  Conventionally, in a compressed air dehumidifier that dehumidifies compressed air in a high temperature / humidity state introduced from a compressed air device that generates compressed air, heat contained in the air is removed by causing condensation and condensation. A exchanger and a device for cooling compressed air through the heat exchanger (for example, a refrigerator, a device for using a cooling medium such as groundwater) are included as components.

  As such a compressed air dehumidifier, for example, in order to preferably enhance the dehumidifying effect, heat exchangers are provided in two stages of a first heat exchanger section and a second heat exchanger section, and the first In the flow path for cooling related to the primary side compressed air and the secondary side compressed air so that the heat exchanger unit pre-cools the primary side compressed air and reheats the secondary side compressed air The second heat exchanger unit is provided by being arranged so as to intersect with the flow path for reheating, and the second heat exchanger unit is a medium for cooling the compressed air precooled in the first heat exchanger unit. There are some which are provided so as to cause dew condensation to dehumidify by cooling.

As such a compressed air dehumidifier, for example, one having the following configuration has been previously disclosed by the present applicant (see Patent Document 1).
As shown in FIG. 7, the heat exchanger is provided with a heat exchanger for dehumidifying moisture contained in the compressed air pumped by an air compressor (not shown), and a refrigeration cycle 40 for cooling the compressed air. Further, the heat exchanger includes the compressed air introduced from the inlet 33 into the primary cooling unit (flow passage 11 for primary cooling), the secondary cooling unit (flow passage 22 for secondary cooling), and the reheating unit (re-heating unit). It is configured to be able to be discharged from the discharge port 37 via a gas flow path consisting of a heat flow path 12). Further, in the heat exchanger, drain traps 50 for discharging the water generated by the dehumidification to the outside of the apparatus are disposed at the drain discharge ports 51 and 52, respectively. On the other hand, the refrigeration cycle 40 includes an evaporator 41 disposed in the secondary cooling unit (secondary cooling channel 22) of the heat exchanger to cool compressed air by the heat of vaporization of the refrigerant, and the vaporized refrigerant A compressor 42 for pumping with a constant pumping capacity, a condenser 43 for condensing and liquefying the compressed vaporized refrigerant, a receiver 44 for temporarily storing the liquefied refrigerant, and a capillary tube 45 for reducing the pressure of the liquefied refrigerant Is equipped.

  In this dehumidifier, first, the compressor 42 is driven to circulate the refrigerant in the refrigeration cycle 40. At this time, the liquefied refrigerant in the liquid receiver 44 passes through the capillary tube 45 and is discharged into the evaporator 41, and the liquefied refrigerant is vaporized in the evaporator 41, whereby the secondary cooling unit of the heat exchanger ( The flow path 22) for secondary cooling is cooled. By driving an air compressor (not shown) in this state, compressed air containing water is introduced from the inlet 33. Also, the compressed air introduced into the heat exchanger is pre-cooled when passing through the primary cooling unit (flow passage 11 for primary cooling), and then the secondary cooling unit (flow passage 22 for secondary cooling) When passing through, the evaporator 41 is cooled to a predetermined dew point temperature or less. At this time, the moisture in the compressed air condenses as condensation water on the surface of the fin attached to the evaporator 41, and the condensation water flows toward the bottom of the heat exchanger and falls from the drain discharge ports 51 and 52. It is discharged to the outside. On the other hand, the compressed air dehumidified in the secondary cooling unit (flow passage 22 for secondary cooling) is introduced from the inlet 33 when passing through the reheating unit (flow passage 12 for reheating). It is reheated by the compressed air and discharged from the discharge port 37.

  The above-mentioned compressed air dehumidifier is a horizontally long horizontal type, but for a vertically long vertical type, for example, compressed air is housed in an airtight container containing an evaporator portion of a refrigerator for circulating compressed air, compressed air In the compressed air dehumidifying apparatus provided with a drain outlet and an inlet and an outlet, the compressed air circulating in the container is condensed water in the vicinity of the drain outlet in the upper part of the drain outlet in the container. While providing a windproof wall covering the upper part of the drain outlet to prevent winding up and scattering into the space inside the container, the container is provided on the surface of the member constituting the compressed air dehumidifier near the drain outlet in the container, A drainage member (see Patent Document 2) of a compressed air dehumidifier characterized in that a trap material for covering the surface portion of the above-mentioned member is provided to attach moisture in compressed air circulating through the inside. It has been previously proposed by the applicant. According to this, it is possible to enhance the dehumidification effect by preventing re-scattering of the water that has fallen down to the trap material of the windproof wall, but when the processing air volume increases and the flow velocity of the compressed air increases, the trap It was difficult to prevent the roll-up phenomenon in which the water until reaching the material was drawn into the compressed air flow and re-scattered.

JP 2001-183014 A (FIG. 1, [0002], [0003]) Japanese Utility Model Application Publication No. 60-190987 (claim 1, FIG. 1)

  The problem to be solved with respect to the compressed air dehumidifier is that although it can be installed in a small floor space by being placed vertically, the first heat exchanger section and the second to be cooled by the cooling medium Since the heat exchanger section is disposed vertically adjacent to the heat exchanger, water separated by condensation from the compressed air is easily drawn into the flow of the compressed air and redispersed, particularly in a state where the processing air volume is increased. It is difficult to obtain the required dehumidifying effect when used.

  That is, in the horizontal installation type as in Patent Document 1 described above, since the second heat exchanger portion to be cooled by the cooling medium is positioned lower than the first heat exchanger portion, the compression is performed. Water condensed and separated from the air is discharged along the lower portion of the second heat exchanger section. According to this, a sufficient distance is provided between the lower part from which water due to condensation is discharged and the flow path for reheating of the compressed air on the secondary side in the first heat exchanger part on the upper side. Since it is difficult to cause re-scattering of water, it is easy to obtain the required dehumidifying effect. On the other hand, in the case of vertical installation, it is difficult to determine the discharge path of the water once separated by condensation from the compressed air, and the water is drawn down and drawn into the flow of compressed air while reaching the drain section. Is likely to occur again. In particular, when the processing air volume is increased, the flow velocity of the compressed air is increased, and thus the water separated by the condensation tends to be drawn into the flow of the compressed air.

  Therefore, the object of the present invention is to be able to be installed compactly in a small floor space by arranging vertically and without water separated by condensation from compressed air being drawn into the flow of compressed air and re-scattering An object of the present invention is to provide a compressed air dehumidifier capable of obtaining a required dehumidifying effect even when used in a state where the processing air volume is increased.

The present invention comprises the following configuration to achieve the above object.
According to one aspect of the compressed air dehumidifier of the present invention, the primary side compressed air introduced from the compressed air device is dehumidified by heat exchange, and the dehumidified secondary side compressed air is discharged to the pneumatic device. Thus, the heat exchanger is provided in two stages of the first heat exchanger section and the second heat exchanger section, and the first heat exchanger section performs precooling of the compressed air on the primary side and In order to perform reheating of the compressed air on the next side, a flow path for cooling related to the compressed air on the primary side and a flow path for reheating related to the compressed air on the secondary side cross each other And the second heat exchanger unit is provided so as to cause dew condensation by cooling the compressed air pre-cooled in the first heat exchanger unit with a cooling medium and to dehumidify the same. In the compressed air dehumidifier, the first heat exchanger unit and the second heat exchanger unit are: It is disposed in a vertically aligned manner and is incorporated in an outer wall cylindrical main body provided in a vertically elongated container shape, and is disposed below the first heat exchanger portion and the second heat exchanger portion. An air outlet of the second heat exchanger portion is open and an inlet of the flow path for reheating is open, and water generated by condensation is discharged from a drain portion provided at the lower end portion Located above the first compartment, the first heat exchanger and the second heat exchanger, the outlet for the reheating flow passage is opened and the compressed air on the secondary side is opened. A second chamber for retaining compressed air immediately before being discharged, and an air outlet of the second heat exchanger portion for the reheating. An extended air passage portion extending downward so as to be located below an inlet of the flow passage, and a lower portion in the extended air passage portion It is disposed parts; and a demister for separating the water of the compressed air by passing the compressed air discharged at the air outlet of the second heat exchanger unit.

  Further, according to one aspect of the compressed air dehumidifying device according to the present invention, the built-in cylindrical main body in which the second heat exchanger portion is vertically vertically incorporated at an eccentric position inside the outer wall cylindrical main body. And a refrigerant pipe for letting the cooling medium pass inside the built-in cylindrical body, and a heat exchange fin attached to the refrigerant pipe, and the extended air passage portion is the refrigerant pipe. The built-in cylindrical main body is extended downward except at a portion extending continuously to the outside, and the lower end portion is opened, and the eccentrically positioned so as to be close to the outer wall cylindrical main body inner wall It can be characterized in that the horizontal cross section in the form of a notch is provided in a D shape.

  Further, according to one aspect of the compressed air dehumidifying device according to the present invention, the lower end side of the side wall flat portion is a side wall flat portion forming a chord portion in the extended air passage portion having a D-shaped horizontal cross section. According to the present invention, it is characterized in that it comprises a side opening which constitutes a part of the air outlet of the second heat exchanger section.

  According to the compressed air dehumidifying device according to the present invention, the vertical installation can be compactly installed in a small floor space, and water separated by condensation from the compressed air is drawn into the flow of the compressed air. It is possible to obtain the special advantageous effect that the required dehumidifying effect can be obtained even when using the apparatus in the state where the processing air volume is increased without re-scattering.

It is a sectional view showing typically an example of a form of a compressed air dehumidifier concerning the present invention. It is a sectional view showing an example of a compressed air dehumidifier concerning the present invention. It is the sectional view on the AA line of the example of a form of FIG. It is sectional drawing seen from the B arrow direction of the embodiment of FIG. It is the perspective view seen from the lower end part side about the embodiment of the partition member (D-shaped cylindrical member) which forms the extended ventilation path part of the embodiment of FIG. It is the perspective view which looked at the partition member (D-shaped cylindrical member) of FIG. 5 from the upper end part side. It is a block diagram including a schematic sectional view of a compressed air dehumidifier illustrating a system of a conventional compressed air dehumidifier.

Hereinafter, embodiments of the compressed air dehumidifying apparatus according to the present invention will be described in detail based on the attached drawings (FIGS. 1 to 6).
The compressed air dehumidifier dehumidifies the primary side compressed air introduced from the compressed air device by heat exchange, and the heat exchanger is configured to discharge the dehumidified secondary side compressed air to the pneumatic device. The first heat exchanger section 10 is provided in two stages of the heat exchanger section 10 and the second heat exchanger section 20, and performs precooling of the primary side compressed air and the secondary side compressed air In order to reheat, the cooling flow path (primary flow path 11) for the compressed air on the primary side and the flow path 12 for reheat for the compressed air on the secondary side cross each other. The second heat exchanger unit 20 is provided by being disposed, and the compressed air pre-cooled in the first heat exchanger unit 10 is condensed by cooling it with a cooling medium so that dew condensation is generated and dehumidified. Provided in

  Then, the first heat exchanger unit 10 and the second heat exchanger unit 20 are disposed vertically adjacent to each other, and are provided so as to be incorporated in the outer wall cylindrical main body 30 provided in a vertically elongated container shape. . The outer wall cylindrical main body 30 is provided in the form of a cylindrical body whose both ends are closed by a lower end mirror plate 34 and an upper end mirror plate 36. In this embodiment, the inlet 33 of the primary side compressed air introduced from the compressed air device and the outlet for discharging the dehumidified secondary side compressed air to the pneumatic device in the upper part of the outer wall cylindrical main body 30 37 are provided. A discharge port 37 is provided above the inlet 33 so as to open to a second small chamber 32 described later. Reference numerals 30a and 30b denote partition walls, which support the second heat exchanger unit 20 inside the outer wall cylindrical main body 30, and the partition wall 30a serves as a first heat exchanger unit 10 and a first heat exchanger unit 10 described later. Partitions 30b are provided to partition the first heat exchanger unit 10 and the second compartments 32.

  Thus, by arranging the inlet 33 and the outlet 37 at the upper portion of the outer wall cylindrical main body 30, the flow path is configured such that the upper side is the side where the temperature of the compressed air is high for each process of heat exchange. Since the specific gravity of the air (compressed air), which can be lighter at higher temperatures, makes the flow of compressed air smoother and heat exchange can be performed efficiently, resulting in efficient compressed air Dehumidification can be performed.

  Reference numeral 31 denotes a first chamber, which is located below the first heat exchanger unit 10 and the second heat exchanger unit 20, and the air outlet 27 of the second heat exchanger unit is opened and reheating is performed. It is a small chamber in which the inlet 14 of the flow path is opened, and water generated by condensation is discharged from the drain portion 35 provided at the lower end.

  That is, the first small chamber 31 is provided on the lower end side which is the one end side of the outer wall cylindrical main body 30, and the compressed air discharged from the second heat exchanger unit 20 is It is a stagnant space for guiding to the reheating flow passage 12 of the heat exchanger unit 10. In addition, a drain hole of the drain portion 35 is provided at the bottom center of the concave inner surface formed by the end plate of the pressure vessel (lower end end plate 34) at the lower end portion of the first small chamber 31 of this embodiment. The drain trap 50 as shown in FIG. 7 is attached to the drain portion 35. Thus, water (condensed water) generated by condensation can be suitably drained from the bottom of the lower end plate 34 which is the lower end plate of the outer wall cylindrical main body 30.

  Reference numeral 32 denotes a second small chamber, which is located above the first heat exchanger section 10 and the second heat exchanger section 20, and the outlet 15 of the flow path for reheating is opened and the secondary It is a small chamber in which a discharge port 37 for discharging the side compressed air to the pneumatic device is opened, and is provided to retain the compressed air just before being discharged.

  That is, the second small chamber 32 is provided on the upper end side which is the other end side of the outer wall cylindrical main body 30, and is discharged from the flow path 12 for reheating of the first heat exchanger unit 10. It is a stagnant space for guiding the compressed air to the discharge port 37. As described above, since the first small chamber 31 and the second small chamber 32 and the reheating flow passage 12 are provided, the compressed air flows upward from the bottom of the flow passage 12 for reheating. As a result, the compressed air is reheated and flows to the second small chamber 32 and is discharged from the discharge port 37.

  And in the present invention, in the first small chamber 31, the extended ventilation extended downward so that the air outlet 27 of the second heat exchanger section is located below the inlet 14 of the flow path for reheating. A road section 25 is provided. Further, in the present invention, the moisture in the compressed air is disposed by passing the compressed air disposed at the lower end portion in the extended air passage portion 25 and discharged at the air outlet 27 of the second heat exchanger portion. It has a demister 28 to be separated. Note that the demister 28 used in this embodiment is formed into a highly air-permeable coarse dust filter by knitting so that coarse voids can be uniformly provided using a thin metal wire such as stainless steel as a raw material. Are appropriately laminated and molded.

  According to the demister 28, the moisture in the compressed air collides with the metal wire, causing the moisture to condense from the compressed air and separating it as water particles, or making the water particles into larger water droplets Water can also be collected to produce a stream of water. According to this, the water separated from the compressed air becomes a larger mass and drips from the air outlet 27 of the second heat exchanger section, and the water once separated is dehumidified on the secondary side. It is possible to prevent the return to the compressed air and to enhance the dehumidifying effect.

Further, since the air outlet 27 of the second heat exchanger section is located lower than the inlet 14 for the reheating flow channel by the extended air flow passage section 25, the flow channel inlet 14 for the reheating and the Interval can be made longer. Then, when the compressed air is discharged from the air outlet 27 of the second heat exchanger section to the first small chamber 31, the flow velocity of the compressed air can be sufficiently reduced, and the particles and flow of water are It is efficiently separated from the flow of the compressed air. The reason why the flow rate of the compressed air can be reduced is because the compressed air is discharged from the extension vent portion 25 having a small volume to the first small chamber 31 having a large volume. For this reason, it is possible to prevent the moisture once separated from being rolled up and returned to being drawn into the dehumidified secondary side compressed air, thereby enhancing the dehumidifying effect. Furthermore, by extending the flow of the compressed air (including inversion) by the extended air passage portion 25, the moisture can be separated by the inertial force, and the dehumidifying effect can be enhanced.
According to the above effect, the compressed air and the moisture are suppressed by the synergetic effect of the form of the extended air passage 25 which is a relatively simple structure and the demister 28, and the increase of the air resistance (pressure loss) is suppressed, and the efficiency is improved. It can be separated well.

  Further, in the specific embodiment shown in FIGS. 2 to 6, the second heat exchanger unit 20 is closed at the upper end with respect to the configurations of the first heat exchanger unit 10 and the second heat exchanger unit 20. A plurality of pipes (a reheating pipe 13 forming a flow path 12 for reheating) which is formed in a cylindrical shape and is disposed so as to surround the cylindrical side peripheral wall from one side in a crescent shape as shown in FIG. The first heat exchanger unit 10 having the above-mentioned components as a component is disposed in parallel with the second heat exchanger unit 20, so that the first heat exchanger units 10 are arranged vertically in a row and are provided in the shape of a vertically long container. It is incorporated in the outer wall cylindrical main body 30 and provided.

  In the first heat exchanger section 10 of this embodiment, a flow path for primary cooling of compressed air constituted by a space where the inlet 33 is opened and the second heat exchanger section is opened to the air inlet 24. And a flow path 12 for reheating which passes vertically in the flow path 11 for primary cooling. The reheating flow passage 12 is constituted by a plurality of reheating pipes 13 provided in a pipe shape, and provided so as to connect the first small chamber 31 and the second small chamber 32. . In the first heat exchanger section 10, in order to enhance the heat exchange performance, a large number of reheat pipes 13 are practically provided as shown in FIGS.

  Further, in this embodiment, the second heat exchanger unit 20 is disposed in the outer wall tubular main body 30 so as to be vertically elongated at the eccentric position, and the internal tubular main body 21 is provided. A refrigerant pipe 41a for allowing a cooling medium to pass therethrough and a heat exchange fin 41b mounted on the refrigerant pipe 41a are provided. As shown in FIG. 2, reference numeral 21 b denotes an upper end plate portion of the built-in cylindrical main body, which closes the built-in cylindrical main body 21.

  Furthermore, the second heat exchanger unit 20 of this embodiment includes a plurality of refrigerant pipes 41a for circulating the cooling medium, and a large number of heat exchange fins 41b attached to the refrigerant pipes 41a. And a plurality of spaced apart plates 23 for zigzag bending the flow of compressed air in the flow path 22 for secondary cooling. In addition, the configuration of the refrigerant pipe 41a of the second heat exchanger unit 20 and the fins 41b for heat exchange is, for example, the evaporator 41 of the refrigerator (refrigeration cycle 40 (see FIGS. 1 and 7)). The compressed air can be efficiently cooled by the refrigerant circulating in the refrigerant pipe 41a.

  Then, the extended air passage portion 25 is configured to extend the built-in cylindrical main body 21 downward and open at the lower end except for a portion where the refrigerant pipe 41a is extended continuously to the outside. A horizontal cross section in a form in which the side located eccentrically so as to approach the inner wall of the outer wall cylindrical main body 30 is cut out is provided in a D-shape. The extension air passage portion 25 of this embodiment is formed of a cylindrical member 26 having a horizontal cross section D-shaped as shown in FIGS. 5 and 6, and a support portion supporting a lower end surface of the demister 28. It is open except for 26c. In addition, the support part 26c which supports the demister 28 of this example of a form is formed in a grid | lattice form, and it is provided so that an aperture ratio may be improved.

  According to the extended air passage portion 25, the refrigerant pipe 41 a which should be extended from the inside to the outside of the outer wall cylindrical main body 30 can be suitably arranged. Further, the D-shaped cylindrical member 26 forming the extended air passage portion 25 has a side wall surface portion 26a whose horizontal cross section corresponds to a portion of an arc and a horizontal cross section corresponds to a portion of a D-shaped chord. The side wall flat portion 26 b is configured to appropriately guide the flow of the compressed air to enhance the dehumidifying effect. In addition, 21a is a partition plate and it is an end plate part which plugs up a part of lower end of the built-in cylindrical main body 21, and the horizontal cross section can rationally form the extended ventilation path part 25 of D shape by this.

  Furthermore, according to the extended air passage portion 25 of the present embodiment, the side wall flat portion 26b which forms the chord portion in the extended air passage portion 25 having a D-shaped horizontal cross section is the lower end side of the side wall flat portion 26b. In addition, it may be appropriately configured to include a side opening 27b that constitutes a part of the air outlet 27 of the second heat exchanger unit.

  Thus, in addition to the lower end opening 27a of the lower end surface of the D-shaped cylindrical member 26, the side opening 27b can be appropriately formed in the side wall flat portion 26b, so the second heat exchanger The air outlet 27 of the part can be enlarged, so that the rise in air flow resistance can be appropriately suppressed, and the performance can be improved.

  The side opening 27b is formed on the side opposite to the position where the plurality of reheat pipes 13 are disposed (see FIG. 3) so as to be formed as far as possible from the inlet 14 of the flow path for reheat. (The second heat exchanger portion 20 is provided at an eccentric position in the outer wall cylindrical main body 30 so that the outer peripheral surface of the built-in cylindrical main body 21 is closest to the inner peripheral surface of the outer wall cylindrical main body 30 Side surface). According to this, since the side surface opening 27b is formed in the side wall flat portion 26b on the side where the D-shape is cut out, a sufficient distance from the inner peripheral surface of the outer wall cylindrical main body 30 can be maintained. , It can prevent that the flow velocity of the compressed air which blows off increases. Therefore, it is possible to prevent re-scattering by the particles of water being drawn into the flow of compressed air and being rolled up, and it is possible to improve the dehumidifying performance.

  Further, in the compressed air dehumidifying device of this embodiment, as described above, the dehumidifying performance can be increased vertically to a required level or more, and the axis of the outer wall cylindrical main body 30 can be obtained by being vertically installed. The installation position with respect to the direction of the inlet 33 and the outlet 37 can be freely selected centering on the heart. For this reason, the degree of freedom of piping connected to the inlet 33 and the outlet 37 is improved, and, for example, in a configuration in which two compressed air dehumidifiers of this embodiment are connected, it is compared with the conventional horizontal installation. Thus, there is an advantage that a more rational configuration can be realized, such as shortening of the connected piping.

  Although the present invention has been variously described with reference to preferred embodiments, the present invention is not limited to these embodiments, and it goes without saying that many modifications can be made without departing from the spirit of the invention. It is

10 first heat exchanger section 11 flow path for primary cooling 12 flow path for reheating 13 pipe for reheating 14 inlet for flow path for reheating 15 outlet for flow path for reheating 20 second heat Exchanger part 21 built-in cylindrical main body 21a partition plate 22 flow path for secondary cooling 23 plate 24 air inlet of second heat exchanger part 25 extended air passage part 26 D-shaped cylindrical member 26a side wall surface part 26b side wall flat portion 26c support portion 27 second heat exchanger portion air outlet 27a lower end opening 27b side opening 28 demister 30 outer wall cylindrical main body 31 first small chamber 32 second small chamber 33 inlet 34 lower end panel 35 Drain part 36 Top end plate 37 Exhaust port 40 Refrigeration cycle 41 Evaporator 41a Refrigerant piping 41b Fins for heat exchange 42 Compressor 43 Condenser 44 Receiver 45 Capillary tube 50 Drent rack 51 Drain port 52 Drain port

Claims (2)

The heat exchanger performs a dehumidification by heat exchange on the primary side compressed air introduced from the compressed air device and discharges the dehumidified secondary side compressed air to the pneumatic device, the heat exchanger comprising the first heat exchanger portion The primary side is provided in two stages of a second heat exchanger unit, and the first heat exchanger unit performs precooling of compressed air on the primary side and reheating of compressed air on the secondary side. Provided so that the flow path for cooling related to the compressed air and the flow path for reheating related to the compressed air on the secondary side cross each other, and the second heat exchanger unit is In the compressed air dehumidifying device provided so as to cause dew condensation to dehumidify by cooling the compressed air pre-cooled in the first heat exchanger section with a cooling medium,
The first heat exchanger unit and the second heat exchanger unit are vertically disposed adjacent to each other, and are incorporated in an outer wall cylindrical main body provided in a vertically elongated container shape,
An air outlet of the second heat exchanger unit is opened and an inlet of the flow path for reheating is opened, which is located below the first heat exchanger unit and the second heat exchanger unit. A first chamber in which water generated by condensation is drained from a drain provided at the lower end,
Located above the first heat exchanger section and the second heat exchanger section, the outlet for the reheating flow passage is opened and the secondary side compressed air is discharged to a pneumatic device A second chamber in which the compressed air immediately before being discharged is retained;
An extended air passage portion extended downward so that an air outlet of the second heat exchanger portion is located below an inlet of the flow path for reheating;
And a demister disposed at a lower end portion in the extended air passage portion to separate moisture in the compressed air by passing the compressed air discharged at the air outlet of the second heat exchanger portion ,
A built-in cylindrical main body in which the second heat exchanger unit is vertically vertically incorporated at an eccentric position inside the outer wall cylindrical main body, and a refrigerant that allows a cooling medium to pass through the built-in cylindrical main body Piping for heat exchange and fins for heat exchange attached to the piping for refrigerant.
The extended air passage portion is configured such that the built-in cylindrical main body is extended downward and opened at a lower end portion except a portion where the refrigerant pipe is extended so as to be continuous to the outside, A compressed air dehumidifying device characterized in that a horizontal cross section in a form in which the side located eccentrically so as to approach the inner wall of a cylindrical main body is cut out is provided in a D shape . A portion of the air outlet of the second heat exchanger portion is formed on a side wall flat portion forming a chord portion of the extended air passage portion having a D-shaped horizontal cross section and the lower end portion side of the side wall flat portion. The compressed air dehumidifier according to claim 1, further comprising a side opening configured.

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