Compressed air dehumidifier and compressed air dehumidifier unit

Abstract

To provide a compressed air dehumidification device in a vertically long shape in which a temperature sensor that can sense a dew point temperature is arranged at an appropriate position, and a compressed air dehumidification device unit.SOLUTION: A compressed air dehumidification device, in which heat exchangers are provided in two stages of a first heat exchanger part 30 and a second heat exchanger part 40 and the two heat exchanger parts 30 and 40 are arranged adjacently in vertical long shapes, comprises; a first small chamber 26, built in a dehumidification device housing 21 and positioned below the two heat exchanger parts 30 and 40, which an air outlet 47 of the second heat exchanger part 40 opens to and an inlet 34 of a passage for reheating opens to, in which a drain discharge port 29 is provided at a lower end part thereof; a second small chamber 27, positioned above the two heat exchanger parts 30 and 40, which retains compressed air which is discharged immediately therein; and a temperature sensor 60 in which a sensing part 61 is arranged at a site of the air outlet 47 of the second heat exchanger part 40 which is close to the first small chamber 26.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a compressed air dehumidifier and compressed air dehumidifier unit in which a heat exchanger is provided in two stages, a first heat exchanger section and a second heat exchanger section, inside a dehumidifier housing so as to dehumidify primary-side compressed air introduced from a compressed air device by heat exchange and discharge the dehumidified secondary-side compressed air to pneumatic equipment, the first heat exchanger section is provided by arranging a pre-cooling flow path for the primary-side compressed air and a reheating flow path for the secondary-side compressed air so as to pre-cool the primary-side compressed air and reheat the secondary-side compressed air so as to intersect, and the second heat exchanger section is provided to cool the compressed air pre-cooled in the first heat exchanger section with a cooling medium to cause condensation and dehumidify the air. [Background technology]

[0002] A conventional compressed air dehumidifier proposed by the present applicant is a compressed air dehumidifier comprising a dehumidifier main body having an inlet for introducing compressed air, a cooling section that cools the compressed air introduced from the inlet and condenses the water in the compressed air to dehumidify the compressed air, and an outlet for discharging the compressed air dehumidified by the cooling section; an evaporator arranged in the cooling section inside the dehumidifier main body, and a cooling circuit having a compressor, condenser, and expansion valve arranged outside the dehumidifier main body, and which circulates a refrigerant through the evaporator, compressor, condenser, and expansion valve in that order; and a reheater that heats the compressed air discharged from the outlet by utilizing heat released by the cooling circuit (see Patent Document 1).

[0003] Furthermore, the present applicant has proposed a conventional vertically-mounted compressed air dehumidifier in which a heat exchanger is provided in two stages, a first heat exchanger section and a second heat exchanger section, the two heat exchanger sections being arranged side by side vertically and built into an outer-wall cylindrical body, the first small chamber 26 being located below the two heat exchanger sections and into which the air outlet of the second heat exchanger section and the inlet of the reheating flow path are opened, the first small chamber having a drain section at its lower end, a second small chamber being located above the two heat exchanger sections and for retaining compressed air just before it is discharged, an extended air vent section extending downward so that the air outlet of the second heat exchanger section is located below the inlet of the reheating flow path, and a demister being arranged at the lower end of the extended air vent section and through which compressed air passes (see Patent Document 2).

[0004] Furthermore, the present applicant has proposed a compressed air dehumidifier equipped with a conventional temperature sensor, which comprises a dehumidifier main body having an inlet for introducing compressed air, a cooling section that cools the introduced compressed air and condenses the water content in the compressed air to dehumidify the compressed air, and an outlet port for discharging the dehumidified compressed air, a compressor, a condenser, an expansion valve, and an evaporator arranged in the cooling section of the dehumidifier main body, and a cooling circuit having a refrigerant circulation pipe that circulates refrigerant through the compressor, condenser, expansion valve, and evaporator in that order, in which a temperature sensor is attached to the refrigerant circulation pipe on the refrigerant outlet side of the evaporator, at a location that comes into contact with the compressed air after passing through the evaporator (see Patent Document 3).

[0005] Furthermore, the present applicant has proposed a compressed air dehumidifier capable of maintaining a conventional required dew point, which comprises a dehumidifier main body having an inlet for introducing compressed air, a cooling section that cools the introduced compressed air to condense the water in the compressed air and dehumidify the compressed air, and an outlet port for discharging the dehumidified compressed air, a compressor, a condenser, an expansion valve, and an evaporator located in the cooling section of the dehumidifier main body, and a cooling circuit that circulates refrigerant through the compressor, condenser, expansion valve, and evaporator in that order, and which is equipped with a control section that stops operation of the compressor if the refrigerant temperature falls below a predetermined temperature while the compressor is operating, based on the refrigerant temperature at the refrigerant outlet side of the evaporator, and that resumes operation of the compressor if the compressed air temperature exceeds a predetermined temperature while the compressor is not operating, based on the temperature of the compressed air that has passed through the evaporator (see Patent Document 4). [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2011-005374 A (page 1) [Patent Document 2] JP 2017-127801 A (Page 1) [Patent Document 3] JP 2016-052610 A (Page 1) [Patent Document 4] JP 2016-052611 A (Page 1) Summary of the Invention [Problem to be solved by the invention]

[0007] The problem to be solved with regard to compressed air dehumidifiers and compressed air dehumidifier units is that, in vertically elongated compressed air dehumidifiers that are designed to dehumidify compressed air by cooling it with a cooling medium to cause condensation, no proposal has been made regarding the appropriate placement of a temperature sensor that can detect (monitor) the dew point temperature so as to appropriately adjust and control the cooling load of the cooling medium. Prior art (see Patent Documents 3 and 4) proposes a system in which a temperature sensor is attached to a refrigerant flow pipe on the refrigerant outlet side of an evaporator to measure the refrigerant temperature and thereby control the cooling load, but because it does not directly measure the dew point temperature, it is difficult to improve accuracy.

[0008] SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a vertically elongated compressed air dehumidifier and compressed air dehumidifier unit in which a temperature sensor capable of detecting a dew point temperature is disposed at an appropriate position. [Means for solving the problem]

[0009] In order to achieve the above object, the present invention has the following configuration. According to one aspect of the compressed air dehumidifier of the present invention, a heat exchanger is provided in two stages, a first heat exchanger unit and a second heat exchanger unit, inside a dehumidifier housing so as to dehumidify primary-side compressed air introduced from a compressed air device by heat exchange and discharge the dehumidified secondary-side compressed air to pneumatic equipment, the first heat exchanger unit is provided by arranging a pre-cooling flow path for the primary-side compressed air and a reheating flow path for the secondary-side compressed air so as to intersect with each other so as to pre-cool the primary-side compressed air and reheat the secondary-side compressed air, and the second heat exchanger unit is provided to cool the compressed air pre-cooled in the first heat exchanger unit with a cooling medium to cause condensation and dehumidify the compressed air. the first small chamber is located below the first heat exchanger section and the second heat exchanger section, and has an air outlet of the second heat exchanger section and an inlet of the reheating flow path opening, and drain water generated by condensation is discharged from a drain outlet provided at a lower end thereof; the second small chamber is located above the first heat exchanger section and the second heat exchanger section, and has an outlet of the reheating flow path opening and a compressed air outlet for discharging the secondary-side compressed air to pneumatic equipment opening, and retains the compressed air immediately before being discharged; and a temperature sensor having a sensing unit disposed on the side of the first small chamber at the position of the air outlet of the second heat exchanger section.

[0010] Furthermore, one form of the compressed air dehumidifier according to the present invention can be characterized in that it comprises an extended air vent path section that is extended downward so that the air outlet of the second heat exchanger section is located below the inlet of the reheat flow path, and a demister that is disposed at the lower end of the extended air vent path section and separates moisture from the compressed air by passing the compressed air discharged at the air outlet of the second heat exchanger section through the demister, and the sensing section at the tip of the temperature sensor is inserted inside the demister so as to come into contact with components that make up the demister.

[0011] Furthermore, according to one embodiment of the compressed air dehumidifier of the present invention, the temperature sensor can be attached by fixing the base of the temperature sensor to a portion of the dehumidifier housing that forms the first small chamber.

[0012] Furthermore, according to one embodiment of the compressed air dehumidifier of the present invention, the cooling medium is a refrigerant of a refrigeration cycle device having a compressor, a condenser, an expansion valve, and an evaporator, and the component of the second heat exchanger section is the evaporator.

[0013] Furthermore, one aspect of the compressed air dehumidifier according to the present invention can be characterized by including a control device that controls operation of the refrigeration cycle device based on information detected by the temperature sensor.

[0014] According to one embodiment of the compressed air dehumidifier unit of the present invention, the compressed air dehumidifier and the refrigeration cycle device are housed inside a casing, the dehumidifier housing has a compressed air inlet into which compressed air is introduced and a compressed air outlet from which dehumidified compressed air is discharged, the compressed air outlet and an outlet pipe extending from the compressed air outlet are disposed in an upper part of the inside of the casing, the condenser of the refrigeration cycle device is disposed below the compressed air outlet and a cooling fan of the condenser is disposed so as to blow air toward the inside of the casing, and exhaust air generated when air is heated by the blowing of the cooling fan as it passes through a heat exchanger part of the condenser is blown out of the compressed air outlet and The exhaust port in the casing for the exhaust air is provided at the top of the casing so that the exhaust air passes through the space in which the outlet piping is arranged, the compressed air inlet and the inlet piping extending from the compressed air inlet are arranged at the top of the interior of the casing, the condenser of the refrigeration cycle device is arranged below the compressed air inlet and the cooling fan of the condenser is arranged to blow air toward the interior of the casing, and the exhaust port in the casing for the exhaust air is provided at the top of the casing so that the exhaust air generated when the air is heated by the blowing of the cooling fan as it passes through the heat exchanger section of the condenser is exhausted through the space in which the compressed air inlet and the inlet piping are arranged. [Effects of the Invention]

[0015] The compressed air dehumidifier and compressed air dehumidifier unit of the present invention have the particularly advantageous effect of allowing a temperature sensor capable of detecting the dew point temperature to be arranged in an appropriate position when the compressed air dehumidifier is installed in a vertically long shape. [Brief explanation of the drawings]

[0016] [Figure 1] 1 is a schematic vertical cross-sectional view seen from the side, showing an example of a compressed air dehumidifier unit according to the present invention. [Figure 2]FIG. 2 is a schematic front view of the embodiment of FIG. 1 as seen from the front side. [Figure 3] FIG. 2 is a schematic vertical cross-sectional view of the embodiment of FIG. 1 as seen from the rear side. [Figure 4] 1 is an explanatory diagram showing an example of a compressed air dehumidifier system according to the present invention, and schematically illustrating a longitudinal section and a refrigeration cycle of a compressed air dehumidifier. [Figure 5] 1 is a vertical cross-sectional view showing an example of a compressed air dehumidifier according to the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0017] Hereinafter, an embodiment of a compressed air dehumidifier unit according to the present invention will be described in detail with reference to the accompanying drawings (FIGS. 1 to 5).

[0018] The compressed air dehumidifier unit according to the present invention is a refrigeration cycle device 10 including a compressor 11, a condenser 12, an expansion valve 14, and an evaporator 15; a dehumidifier housing 21 as a pressure vessel provided with a compressed air inlet 22 through which compressed air is introduced and a compressed air outlet 24 through which dehumidified compressed air is discharged; and a compressed air dehumidifier 20 including the evaporator 15 of the refrigeration cycle device 10 installed inside the dehumidifier housing 21 so as to cool the compressed air introduced into the dehumidifier housing 21 and dehumidify the moisture in the compressed air, all housed inside a casing 50. That is, the evaporator 15 of the refrigeration cycle device 10 is built in the compressed air dehumidifier 20, and the compressor 11, condenser 12, and expansion valve 14 of the refrigeration cycle device 10 are installed outside the compressed air dehumidifier 20 and housed inside the casing 50.

[0019] In addition, in the compressed air dehumidifier unit of the present invention, the compressed air outlet 24 and the outlet piping 25 extending from the compressed air outlet 24 are arranged at the top of the inside of the casing 50, the condenser 12 of the refrigeration cycle device 10 is arranged below the compressed air outlet 24, and the cooling fan 13 of the condenser 12 is arranged so as to blow air (outside air) toward the inside of the casing 50.

[0020] In the compressed air dehumidifier unit of the present invention, an exhaust port 51 in the exhaust air casing 50 is provided at the top of the casing 50 so that the exhaust air generated when air is heated as it passes through the heat exchanger section 12a of the condenser 12 by the blowing of air from the cooling fan 13 is exhausted through the space in which the compressed air outlet 24 and outlet piping 25 are arranged.

[0021] The compressed air dehumidifier unit according to the present invention has the particularly advantageous effect of being able to appropriately utilize the exhaust heat of the condenser 12 of the refrigeration cycle apparatus 10 to reheat the dehumidified compressed air discharged from the compressed air outlet 24 of the compressed air dehumidifier 20. That is, the dehumidified compressed air discharged from the compressed air outlet 24 of the compressed air dehumidifier 20 is cooled when dehumidified by the cooling action of the evaporator 15, but can be reheated by applying exhaust air heated by the exhaust heat of the condenser 12 to the compressed air outlet 24 and outlet piping 25. This allows the compressed air to be reheated and compressed air of a desired temperature to be discharged and supplied as product air, thereby making effective use of the exhaust heat of the condenser 12 and achieving energy savings. Incidentally, the compressed air cooled by a refrigerant in a heat exchanger such as the second heat exchanger section 40 described below and discharged has a relative humidity of 100% at the air outlet 47, and the relative humidity decreases when the air is reheated by passing through the reheating flow path 32. However, in order to prevent re-condensation, it is desirable to reheat the air to about the outside temperature. According to the present invention, as described above, by utilizing the exhaust heat of the condenser 12 of the refrigeration cycle device 10, it is possible to effectively reheat the air so as to prevent re-condensation.

[0022] In this embodiment, the compressed air dehumidifier 20 is installed vertically inside the casing 50. That is, the vertically-installed compressed air dehumidifier 20 that is long vertically is stored upright inside the vertically-shaped casing 50. The casing 50 in this embodiment has a box-like shape that is a vertically-long rectangular parallelepiped.

[0023] This configuration allows the exhaust air from the condenser 12 to flow smoothly, and the installation floor area can be reduced, allowing for compact installation. In other words, the vertical installation configuration allows for effective use of the installation space, and the heated air generates an ascending air current, allowing the exhaust air from the condenser 12 to flow smoothly. As a result, the exhaust air from the condenser 12 can be smoothly directed toward the compressed air outlet 24 and the outlet piping 25, and the dehumidified compressed air discharged from the compressed air outlet 24 can be efficiently heated (reheated). Note that the compressed air dehumidifier unit according to the present invention is not limited to a vertical installation of the compressed air dehumidifier 20, and a certain effect can be achieved as long as the condenser 12, the compressed air inlet 22, and the compressed air outlet 24 are positioned relative to each other as in this embodiment.

[0024] In this embodiment, the condenser 12 is disposed along the upright surface of the casing 50, and is piped so that the refrigerant heated by being compressed by the compressor 11 flows in from the upper side of the condenser 12 and flows out from the lower side, as shown schematically by the dashed line in Fig. 1. The upright surface is not limited to a vertical surface when installed, but refers to a surface that is upright so as to be substantially in a vertical position, and may be an actually formed wall surface or an imaginary surface.

[0025] According to this configuration, the refrigerant that has been pressurized by the compressor 11 and heated to the highest temperature is supplied to the high-temperature, high-pressure region, which is the upper part of the heat exchanger section 12a of the condenser 12. The upper exhaust air (first exhaust air F1), which is the air that passes through to cool the upper part (high-temperature, high-pressure region) of the heat exchanger section 12a, has a higher temperature than the lower exhaust air (second exhaust air F2), which has passed through the other part (the lower part, the medium-temperature, medium-pressure region) of the heat exchanger section 12a and exchanged heat. Air that has a higher temperature than the surrounding air flows as an ascending air current, and the upper exhaust air has a higher temperature than the lower exhaust air, which has the advantage of making the flow of the exhaust air smoother and allowing for more efficient exhaust.

[0026] In this embodiment, the condenser 12 is installed vertically, and two cooling fans 13a, 13b are arranged vertically side by side corresponding to the heat exchanger portion 12a of the condenser 12. In this embodiment, as shown in Fig. 1, the casing 50 is formed in the shape of a vertically long rectangular parallelepiped box, and is arranged so that the heat exchanger portion 12a of the condenser 12 faces the front and is exposed, and the two cooling fans 13a, 13b are arranged on the inside side of the casing 50. As a result, the two cooling fans 13a, 13b blow air for cooling (outside air) so as to draw it into the inside of the casing 50, and exhaust air (first exhaust air F1, second exhaust air F2), which is air that has passed through the heat exchanger portion 12a, is exhausted from an exhaust port 51 provided in the upper part of the casing 50.

[0027] As a result, as shown by the dotted lines in FIG. 1 , the first exhaust air F1, which is exhaust air from the upper cooling fan 13a, can be discharged higher in the casing 50, and the second exhaust air F2, which is exhaust air from the lower cooling fan 13b, can be discharged lower in the casing 50 than the exhaust air from the upper cooling fan 13a. In this embodiment, the exhaust ports 51 are composed of exhaust ports 51a on the top surface and exhaust ports 51b on the rear surface, and are provided on the top surface and the upper part of the rear surface of the casing 50 as shown in FIG. 1 . By providing the exhaust ports 51a and 51b in this manner, the first exhaust air F1 and the second exhaust air F2 are discharged with as little interference as possible and with as little airflow resistance as possible. Furthermore, these exhaust ports 51a and 51b can be provided with a large opening area and a high opening ratio, for example, using a lattice-like member, to minimize airflow resistance. This lattice-like member functions to protect the exhaust ports 51a and 51b and ensure safety. In the casing 50 of this embodiment, the upright surfaces such as the side surfaces are surrounded by vertical wall panels 50a, except for the front surface where the heat exchanger section 12a is exposed and the upper part of the back surface where the exhaust port 51b is provided.

[0028] That is, in this embodiment, the compressed air outlet 24 and the outlet piping 25 are disposed above the compressed air inlet 22 and the inlet piping 23, with the outlet piping 25 extending from the top surface to the outside and the inlet piping 23 extending from the back surface to the outside. Therefore, in relation to the arrangement of the compressed air dehumidifier 20 within the casing 50, the first exhaust air F1 from the upper cooling fan 13a can be guided to hit the compressed air outlet 24 and the outlet piping 25, and the second exhaust air F2 from the lower cooling fan 13b can be guided to hit the compressed air inlet 22 and the inlet piping 23. Therefore, the compressed air outlet 24 and the outlet piping 25 can be appropriately heated, and the compressed air inlet 22 and the inlet piping 23 can be appropriately cooled. In this embodiment, the compressed air outlet 24 is provided at the top of the side circumferential surface of the dehumidifier housing 21, and the outlet piping 25 is provided in a form that extends horizontally from the compressed air outlet 24 and then bends upward, these portions being non-insulated areas and configured to facilitate heat exchange. In this embodiment, the compressed air inlet 22 is provided below the compressed air outlet 24 at the top of the side circumferential surface of the dehumidifier housing 21, and the inlet piping 23 is provided in a form that extends horizontally, these portions being non-insulated areas and configured to facilitate heat exchange.

[0029] In this embodiment, the switchboard 16 of the refrigeration cycle apparatus 10 is disposed above the condenser 12 with a cooling gap 52 provided therebetween so as to take in cooling air. In this embodiment, the condenser 12 and the switchboard 16 are exposed to the front surface (front face) of the casing 50, and air is sucked in from the front face by the cooling fan 13, whereby heat exchange is carried out to cool the heat exchanger portion 12a of the condenser 12, and the switchboard 16 is also cooled by the influence of the airflow generated by the cooling fan 13.

[0030] That is, the provision of cooling gap 52 makes it difficult for heat to be transferred from condenser 12 to distribution board 16, and also induces air from outside the machine (outside air) to be caught in the air flow (first exhaust air F1) generated by cooling fan 13, generating secondary air flow F3 as shown in Fig. 1. This secondary air flow F3 passes through distribution board 16 as an air flow that cools it, including the area where inverter heat sink 17 is located on the back side of distribution board 16, and thereby enables distribution board 16 to be cooled effectively.

[0031] Furthermore, in this embodiment, a shielding member 53 is disposed between the switchboard 16 and the condenser 12 to prevent the exhaust air from the cooling fan 13 from directly hitting the switchboard 16. As shown in Fig. 1, the shielding member 53 in this embodiment is disposed between the upper cooling fan 13a of the condenser 12 and the heat sink 17 of the switchboard 16 in the form of a plate that is inclined upward and functions as a rectifying plate so as to gradually narrow the upward flow of air (first exhaust air F1) from the upper cooling fan 13a.

[0032] This effectively blocks the radiant heat generated from the condenser 12, and the Venturi effect, which occurs when the air flow is narrowed and the flow speed is increased, strengthens the flow of the secondary air flow F3 generated by the first exhaust air F1 generated by the cooling fan 13, thereby improving the cooling effect.

[0033] Next, an example of a configuration of a compressed air dehumidifier unit according to the present invention, in which the exhaust air from the condenser 12 is used to cool the compressed air introduced into the compressed air dehumidifier 20, will be described in detail with reference to the accompanying drawings (Figs. 1 to 3).

[0034] In the compressed air dehumidifier unit of the present invention, the compressed air inlet 22 and the inlet piping 23 extending from the compressed air inlet 22 are arranged at the top of the inside of the casing 50, the condenser 12 of the refrigeration cycle device 10 is arranged below the compressed air inlet 22, and the cooling fan 13 of the condenser 12 is arranged so as to blow air toward the inside of the casing 50, and an exhaust port 51 in the exhaust casing 50 is provided at the top of the casing 50 so that the exhaust air generated when the air is heated as it passes through the heat exchanger section 12a of the condenser 12 by the blowing of the cooling fan 13 is exhausted through the space in which the compressed air inlet 22 and the inlet piping 23 are arranged.

[0035] This provides a particularly advantageous effect of allowing the exhaust air from the condenser 12 of the refrigeration cycle apparatus 10 to be appropriately utilized to cool the compressed air introduced from the air compressor of the compressed air dehumidifier 20 to the compressed air inlet 22. That is, the compressed air introduced from the compressed air inlet 22 to the compressed air dehumidifier 20 is heated by the compression action of the air compressor, but can be cooled by directing the exhaust air blown by the cooling fan 13 of the condenser 12 against the compressed air inlet 22 and the inlet piping 23. As a result, the compressed air introduced into the compressed air dehumidifier 20 can be cooled, the exhaust air from the condenser 12 can be effectively utilized, and energy savings can be achieved.

[0036] In this embodiment, as described above, the compressed air dehumidifier 20 is a vertically-installed type that is long vertically and is housed upright inside the vertically-elongated casing 50. This configuration allows for compact installation because the installation floor area is small, as described above, and allows for smooth flow of exhaust air from the condenser 12. This allows the exhaust air from the condenser 12 to smoothly hit the compressed air inlet 22 and the inlet piping 23, thereby efficiently cooling the compressed air introduced into the compressed air outlet 24. Note that the compressed air dehumidifier unit according to the present invention is not limited to a vertical installation of the compressed air dehumidifier 20, and a certain effect can be achieved as long as the condenser 12, the compressed air inlet 22, and the compressed air outlet 24 are positioned as described above.

[0037] In this embodiment, an air guide member 55 that branches the air exhausted by the upper and lower cooling fans 13a, 13b is disposed between the upper and lower cooling fans 13a, 13b so that the air exhausted by the upper cooling fan 13a is guided so as to heat the compressed air outlet 24 and the outlet piping 25, and the air exhausted by the lower cooling fan 13b is guided so as to cool the compressed air inlet 22 and the inlet piping 23. Although the air guide member 55 in this embodiment shown in Figures 1 and 3 is formed in a flat plate shape, the present invention is not limited to this, and it goes without saying that a shape that branches the air exhausted by the upper and lower cooling fans 13a, 13b as effectively as possible in terms of its positional relationship with the exhaust port 51 may be appropriately and selectively set.

[0038] This allows the compressed air (product compressed air) discharged through the compressed air outlet 24 and outlet piping 25 to be efficiently heated (reheated) by the air exhausted by the higher-temperature upper cooling fan 13a, and allows the product compressed air that has been appropriately dried and temperature-adjusted to be supplied to the pneumatic equipment. In addition, the compressed air introduced into the compressed air dehumidifier 20 through the compressed air inlet 22 and inlet piping 23 can be efficiently cooled by the air exhausted by the lower cooling fan 13b, which is at a lower temperature than the air exhausted by the upper cooling fan 13a, and the dehumidification efficiency of the compressed air dehumidifier 20 can be improved. This improves the thermal efficiency of the present system, and achieves energy savings.

[0039] Next, specific examples of temperatures at each component will be shown to explain the conditions under which heat is exchanged at each component. For example, when the outside air temperature is 30°C, the temperature of the introduced compressed air introduced into compressed air dehumidifier 20 is approximately 80°C at most, the temperature of the exhaust air from upper cooling fan 13a is 60-70°C, the temperature of the exhaust air from lower cooling fan 13b is 40-60°C, and the temperature of the exhaust compressed air discharged from compressed air outlet 24 is 20°C, the high-temperature exhaust air from upper cooling fan 13a can efficiently heat (reheat) the exhaust compressed air, and the relatively low-temperature exhaust air from lower cooling fan 13b can efficiently cool the introduced compressed air. Furthermore, heat sink 17 of the inverter disposed in switchboard 16 has a temperature of, for example, 50-60°C, and is effectively cooled because secondary air flow F3 is outside air at, for example, 30°C.

[0040] Next, an embodiment of a compressed air dehumidifier according to the present invention will be described in detail with reference to the accompanying drawings (FIGS. 4 and 5).

[0041] The compressed air dehumidifier 20 of the present invention dehumidifies primary-side compressed air introduced from a compressed air device (compressed air source) such as an air compressor by heat exchange, and discharges (supplies) the dehumidified secondary-side compressed air to pneumatic equipment. Heat exchangers are provided in two stages, a first heat exchanger section 30 and a second heat exchanger section 40, inside the dehumidifier housing. The first heat exchanger section 30 pre-cools the primary-side compressed air and reheats the secondary-side compressed air, with a pre-cooling flow path for the primary-side compressed air and a reheating flow path 32 for the secondary-side compressed air arranged so as to intersect. The second heat exchanger section 40 cools the compressed air pre-cooled in the first heat exchanger section 30 with a cooling medium, causing condensation and dehumidifying the air.

[0042] The first heat exchanger section 30 and the second heat exchanger section 40 are arranged side by side in a vertically long configuration and are housed in a dehumidifier housing 21, which serves as a vertically long pressure vessel. The dehumidifier housing 21 in this embodiment is provided in the form of a cylindrical body whose ends are closed by a lower end head 28a and an upper end head 28b. In this embodiment, the upper part of the dehumidifier housing 21 is provided with an inlet (compressed air inlet 22) for primary-side compressed air introduced from the compressed air device and an outlet (compressed air outlet 24) for discharging dehumidified secondary-side compressed air to pneumatic equipment. The compressed air outlet 24 is provided above the compressed air inlet 22 and opens into a second small chamber 27, which will be described later. Note that 21a and 21b are partition walls that support the second heat exchanger section 40 inside the dehumidifier housing 21, and are arranged so that partition wall section 21a separates the first heat exchanger section 30 from the first small chamber 26 described later, and partition wall section 21b separates the first heat exchanger section 30 from the second small chamber 27.

[0043] By arranging the compressed air inlet 22 and compressed air outlet 24 at the top of the dehumidifier housing 21 in this way, the flow path can be configured so that the upper side is the side with the higher temperature of the compressed air for each heat exchange process.Due to the specific gravity of air (compressed air) which becomes lighter as the temperature increases, the flow of compressed air tends to be smoother, allowing for efficient heat exchange, and as a result, efficient dehumidification of the compressed air.

[0044] 26 is a first small chamber, which is located below the first heat exchanger section 30 and the second heat exchanger section 40, and into which the air outlet 47 of the second heat exchanger section and the inlet 34 of the reheating flow path open, and which is configured so that drain water generated by condensation is discharged from a drain outlet 29 provided at the lower end.

[0045] That is, the first small chamber 26 is provided at the lower end, which is one end side, of the dehumidifier housing 21, and serves as a retention space that guides the compressed air discharged from the second heat exchanger section 40 to the reheating flow path 32 of the first heat exchanger section 30. In addition, a drain hole for a drain outlet 29 is provided at the bottom center of the concave inner surface formed by the pressure vessel head plate (lower end head plate 28a) at the lower end of the first small chamber 26 in this embodiment, and is provided so as to be connected to a drain discharge device. This allows condensed water (drain water) generated by condensation to be efficiently drained from the bottom of the lower end head plate 28a, which is the lower end plate of the dehumidifier housing 21.

[0046] Further, 27 is a second small chamber, which is located above the first heat exchanger section 30 and the second heat exchanger section 40, and into which the outlet 35 of the reheating flow path opens and into which the compressed air outlet 24 for discharging the secondary side compressed air to the pneumatic equipment opens, and which is arranged to retain the compressed air just before it is discharged.

[0047] That is, the second small chamber 27 is provided on the upper end side, which is the other end side, of the dehumidifier housing 21, and serves as a retention space that guides the compressed air discharged from the reheating flow path 32 of the first heat exchanger section 30 to the compressed air outlet 24. As the first small chamber 26, the second small chamber 27, and the reheating flow path 32 are provided in this manner, the compressed air flows from bottom to top in the reheating flow path 32, whereby the compressed air is reheated, flows into the second small chamber 27, and is discharged from the compressed air outlet 24.

[0048] In addition, the compressed air dehumidifier according to the present invention includes a temperature sensor 60 with a sensing unit 61 disposed on the side of the first chamber 26, at the location of the air outlet 47 of the second heat exchanger section 40. That is, the temperature sensor 60 in this embodiment is configured so that the sensing unit 61 is disposed in the lower part of the interior of the dehumidifier housing 21, in a space where the compressed air is cooled by the cooling medium in the second heat exchanger section 40 and is in the lowest temperature state.

[0049] This allows the temperature sensor 60 to directly measure the temperature (dew point temperature) of the compressed air at its coolest point and dehumidified by condensing the moisture in the compressed air, thereby enabling the most accurate detection of the dew point temperature. Furthermore, if the operating status of the compressed air dehumidifier system of this embodiment drops to a low level or stops, the lowest-temperature compressed air will remain in a settled state due to its high density and weight. Furthermore, because the dehumidifier housing 21 is vertically long, convection is less likely to occur, making it easier for the low-temperature compressed air to remain in a settled state. Therefore, the low-temperature compressed air will stably remain at or near the air outlet 47 of the second heat exchanger unit 40 in the first small chamber 26 where the temperature sensor 60 is located, making it less susceptible to external disturbances. Therefore, the temperature sensor 60 arranged as in this embodiment can accurately and stably monitor the dew point temperature and function appropriately to maintain stable operation of the system.

[0050] In this embodiment, an extended air vent passage 45 is provided in the first small chamber 26, extending downward so that the air outlet 47 of the second heat exchanger section is located below the inlet 34 of the reheat flow path. In this embodiment, a demister 48 is provided at the lower end of the extended air vent passage 45, and separates moisture from the compressed air discharged at the air outlet 47 of the second heat exchanger section by passing the compressed air through the demister 48. The demister 48 used in this embodiment is made by appropriately laminating and molding a highly breathable coarse dust filter formed by weaving thin metal wires such as stainless steel so that coarse voids are uniformly formed.

[0051] With this demister 48, moisture in the compressed air collides with the metal wires, causing the moisture to condense and separate from the compressed air as water particles, causing the water particles to break up into larger droplets, and further acting to collect the water and generate a water flow. As a result, the water separated from the compressed air forms larger clumps that drip out of the air outlet 47 of the second heat exchanger, preventing the separated moisture from returning to the dehumidified secondary compressed air and enhancing the dehumidification effect.

[0052] Furthermore, the extended air passage 45 positions the air outlet 47 of the second heat exchanger unit lower than the inlet 34 of the reheat flow path, thereby increasing the distance between the air outlet 47 and the inlet 34 of the reheat flow path. When the compressed air leaves the air outlet 47 of the second heat exchanger unit and enters the first chamber 26, the flow velocity of the compressed air can be sufficiently reduced, allowing water particles and water to be efficiently separated from the compressed air flow. This prevents the separated moisture from being sucked back into the dehumidified secondary compressed air, thereby enhancing the dehumidification effect. Furthermore, the extended air passage 45 bends (including reverses) the flow of compressed air, allowing moisture to be separated by inertial force, thereby enhancing the dehumidification effect.

[0053] According to the above effects, the relatively simple configuration of extended ventilation path section 45 and the synergistic effect of demister 48 enable compressed air and moisture to be efficiently separated while suppressing an increase in ventilation resistance (pressure loss).

[0054] In this embodiment, the sensing portion 61 at the tip of the temperature sensor 60 is inserted into the demister 48 so as to come into contact with the components that make up the demister 48. As described above, the demister 48 in this embodiment is formed into a coarse dust filter shape using metal wire, and the sensing portion 61 of the temperature sensor 60 is arranged in contact with the metal wire.

[0055] This allows temperature sensor 60 to detect the dew point temperature more accurately and stably. That is, demister 48 is cooled by the passage of low-temperature compressed air that has been cooled by second heat exchanger section 40 and is at its lowest temperature, and becomes the same temperature as that low-temperature compressed air. Furthermore, because sensing section 61 is in contact with the components of demister 48, which are solid compared to compressed air and therefore have high thermal conductivity, temperature sensor 60 is less susceptible to the influence of airflow, which can easily become uneven, and can detect the averaged temperature more accurately and stably.

[0056] 5, the temperature sensor 60 is attached by fixing a base portion 62 of the temperature sensor 60 to a portion of the dehumidifier housing 21 that forms the first small chamber 26. That is, the temperature sensor 60 of this embodiment has a structure in which the sensing portion 61 is inserted from the outside of the dehumidifier housing 21 and the base portion 62 is screwed into a female screw portion provided in the dehumidifier housing 21, thereby enabling the temperature sensor 60 to be attached and detached to a member that constitutes the dehumidifier housing 21. This allows the temperature sensor 60 to be easily attached and detached, facilitating maintenance and management.

[0057] Furthermore, in this embodiment, a control device (not shown) may be provided that controls the operation of the refrigeration cycle apparatus 10 based on detection information (monitored information) from the temperature sensor 60. For example, based on the detection information from the temperature sensor 60, a control device may be provided that, during operation of the compressor 11 of the refrigeration cycle apparatus 10, reduces the rotation speed of the electric motor that drives the compressor 11 through inverter control if the detected temperature (compressed air temperature) drops below a required temperature, and increases the rotation speed of the electric motor that drives the compressor 11 through inverter control if the compressed air temperature exceeds the required temperature. In other words, based on the precise monitor information from the temperature sensor 60 of the present invention, the cooling load of the refrigeration cycle apparatus 10 can be more precisely controlled. Furthermore, for example, based on the detection information from the temperature sensor 60, a control device may be provided that stops operation of the compressor 11 when the detected temperature (compressed air temperature) drops below a predetermined temperature during operation of the compressor 11 of the refrigeration cycle apparatus 10, and resumes operation of the compressor 11 when the compressed air temperature exceeds the predetermined temperature while the compressor 11 is stopped. Note that once the operation of the refrigeration cycle apparatus 10 is stopped, restarting it is likely to result in energy loss, so it is preferable to control the rotation speed of the electric motor using inverter control. Furthermore, control of the operation of the refrigeration cycle apparatus 10 is not limited to control of the compressor 11 but also includes control of other components, such as control of the cooling fan 13 of the condenser 12. For example, if the sensing unit 61 is located at the top of the dehumidifier housing 21, when the operation of the apparatus system is stopped and the supply of compressed air is stopped, resulting in a no-load situation, heat gradually rises and accumulates at the top of the dehumidifier housing 21, which may result in a false detection that the required temperature has been exceeded. In contrast, according to the present invention, the sensing unit 61 is located at the bottom of the dehumidifier housing 21, thereby eliminating the possibility of false detection.

[0058] Next, a more specific example of the configuration of the compressed air dehumidifier according to the embodiment shown in Figs. 4 and 5 will be described. In this embodiment, the first heat exchanger section 30 and the second heat exchanger section 40 are configured such that the second heat exchanger section 40 is formed in a cylindrical shape with a closed upper end, and the first heat exchanger section 30, which is composed of a plurality of pipes (reheat pipes 33 that form the reheat flow path 32) arranged in a crescent shape surrounding the cylindrical side wall from one side, is arranged side by side with the second heat exchanger section 40, so that they are arranged side by side vertically and are built into the dehumidifier housing 21, which is formed in the shape of a vertical container.

[0059] The first heat exchanger section 30 of this embodiment is provided with a pre-cooling flow path 31 for compressed air, which is formed by a space where the compressed air inlet 22 opens and which opens to the air inlet 44 of the second heat exchanger section, and a reheating flow path 32 which passes vertically within the pre-cooling flow path 31. The reheating flow path 32 is formed by a plurality of reheating pipes 33 arranged in a pipe shape, and is provided so as to communicate between the first small chamber 26 and the second small chamber 27. In practice, a large number of reheating pipes 33 are arranged in the first heat exchanger section 30, as shown in FIG. 5, to improve heat exchange performance.

[0060] In this embodiment, the second heat exchanger section 40 includes a built-in cylindrical body 41 that is disposed vertically inside the dehumidifier housing 21 at an eccentric position, a refrigerant pipe 15a that passes a cooling medium inside the built-in cylindrical body 41, and heat exchange fins 15b attached to the refrigerant pipe 15a. As shown in Fig. 4, 41b is an upper end end plate of the built-in cylindrical body, and closes the built-in cylindrical body 41.

[0061] Furthermore, second heat exchanger section 40 of this embodiment includes a plurality of refrigerant pipes 15a through which a cooling medium flows, a large number of heat exchange fins 15b attached to refrigerant pipes 15a, and a plurality of plates 43 arranged at intervals to bend the flow of compressed air in a zigzag pattern within cooled flow path 42. Furthermore, the configuration of refrigerant pipes 15a and heat exchange fins 15b of second heat exchanger section 40 can be used as evaporator 15 of a refrigerator (refrigeration cycle device 10 (see FIG. 4)), for example, as in this embodiment, and compressed air can be efficiently cooled by the refrigerant circulating within refrigerant pipes 15a.

[0062] That is, in this embodiment, the cooling medium is the refrigerant of the refrigeration cycle device 10, and the evaporator 15 is disposed as a component of the second heat exchanger section 40. However, the invention is not limited to this, and even when cooling water supplied from a cold water source is used as the cooling medium, it is of course possible to appropriately control the operation (cooling load) of the compressed air dehumidifier 20 by appropriately controlling the amount of cooling water supplied to the second heat exchanger section 40 via a flow control valve or the like based on detection information from the temperature sensor 60.

[0063] The extended vent passage 45 extends downward from the built-in cylindrical body 41, excluding the portion where the refrigerant pipe 15a extends to the outside, and is open at the lower end, with a D-shaped horizontal cross section formed by cutting out the side that is eccentrically positioned close to the inner wall of the dehumidifier housing 21 (see FIG. 3 of Patent Document 2). The extended vent passage 45 in this embodiment is formed by a cylindrical member 46 that has a D-shaped horizontal cross section, and is open except for a support portion that supports the demister 48 in a state where it is received on the lower end surface. The support portion that supports the demister 48 in this embodiment is formed in a lattice pattern and is provided to increase the opening ratio.

[0064] This extended air vent path 45 allows for the optimal placement of the refrigerant piping 15a that must extend from the inside to the outside of the dehumidifier housing 21. The D-shaped cylindrical member 46 that forms the extended air vent path 45 is composed of a sidewall circumferential surface portion 46a whose horizontal cross section corresponds to the arc of the D, and a sidewall flat surface portion 46b whose horizontal cross section corresponds to the chord of the D, and is configured to appropriately guide the flow of compressed air to enhance the dehumidifying effect. Partition plate 41a serves as an end plate that closes a portion of the lower end of the built-in cylindrical body 41, allowing the extended air vent path 45 whose horizontal cross section is D-shaped to be rationally formed.

[0065] Furthermore, according to the extended ventilation path section 45 of this embodiment, the side wall flat section 46b forms the chord portion of the extended ventilation path section 45, which has a D-shaped horizontal cross section, and can be appropriately configured to have a side opening 47b that forms part of the air outlet 47 of the second heat exchanger section on the lower end side of the side wall flat section 46b (see Figure 4 of Patent Document 2).

[0066] In this way, in addition to the lower end opening 47a on the lower end surface of the D-shaped cylindrical member 46, a side opening 47b can be appropriately formed on the side wall flat portion 46b, which means that the air outlet 47 of the second heat exchanger section can be made larger, the increase in air resistance can be appropriately suppressed, and performance can be improved.

[0067] The side opening 47b is formed on the surface opposite to the position where the multiple reheat pipes 33 are arranged so as to be as far away as possible from the inlet 34 of the reheat flow path (the surface on the side where the outer peripheral surface of the built-in cylindrical body 41 is closest to the inner peripheral surface of the dehumidifier housing 21 when the second heat exchanger unit 40 is provided at an eccentric position within the dehumidifier housing 21). In this way, since the side opening 47b is formed on the side wall flat portion 46b on the D-shaped cutout side, a sufficient distance from the inner peripheral surface of the dehumidifier housing 21 can be maintained, preventing an increase in the flow rate of the blown-out compressed air. Therefore, it is possible to prevent water particles from being drawn into the flow of compressed air, being blown up, and being re-scattered, thereby improving dehumidification performance.

[0068] Furthermore, with the compressed air dehumidifier of this embodiment, the dehumidification performance can be increased to a required level or higher while being placed vertically, and the vertical placement allows for free selection of the installation position relative to the direction of the compressed air inlet 22 and the compressed air outlet 24 around the axis of the dehumidifier housing 21. This increases the degree of freedom in the piping connected to the compressed air inlet 22 and the compressed air outlet 24, and has the advantage of allowing for a more rational configuration, such as the ability to shorten the connecting piping when configuring a configuration in which two compressed air dehumidifiers of this embodiment are connected together, compared to a conventional horizontally placed configuration.

[0069] The present invention has been described above in various ways using preferred embodiments, but the present invention is not limited to these embodiments, and it goes without saying that many modifications can be made within the scope of the invention without departing from the spirit of the invention. [Explanation of symbols]

[0070] 10 Refrigeration cycle device 11 Compressor 12 Condenser 12a Heat exchanger section 13 Cooling fan 13a Upper cooling fan 13b Lower cooling fan 14 Expansion valve 15 Evaporator 15a Refrigerant piping 15b Heat exchange fins 16 Switchboard 17 Heatsink 20 Compressed air dehumidifier 21 Dehumidifier housing 21a Bulkhead 21b Bulkhead section 22 Compressed air inlet 23 Inlet piping 24 Compressed air outlet 25 Outlet piping 26 First Chamber 27 Second Chamber 28a Lower end head plate 28b Upper end head plate 29 Drain outlet 30 First heat exchanger section 31 Pre-cooling channel 32 Reheat channel 33 Reheat pipe 34 Reheat channel inlet 35 Reheat channel outlet 40 Second heat exchanger section 41 Built-in cylindrical body 41a Partition 41b Upper end head of built-in cylindrical body 42 Cooled channel 43 Plate 44 Air inlet of second heat exchanger section 45 Extended ventilation path section 46 D-shaped cylindrical member 46a Side wall peripheral part 46b Side wall flat part 47 Air outlet of second heat exchanger section 47a Bottom opening 47b Side opening 48 Demister 50 casing 50a vertical wall plate 51 Exhaust port 51a Exhaust port on the top 51b Rear exhaust port 52 Cooling gap 53 Shielding material 55 Air flow guide member 60 Temperature Sensor 61 Sensing unit 62 Root F1 First exhaust F2 Second exhaust F3 Secondary air flow

Claims

1. A compressed air dehumidifier in which a heat exchanger is provided in two stages, a first heat exchanger unit and a second heat exchanger unit, inside a dehumidifier housing so as to dehumidify primary-side compressed air introduced from a compressed air device by heat exchange and discharge the dehumidified secondary-side compressed air to pneumatic equipment, the first heat exchanger unit is provided by arranging a pre-cooling flow path for the primary-side compressed air and a reheating flow path for the secondary-side compressed air so as to pre-cool the primary-side compressed air and reheat the secondary-side compressed air so as to intersect, and the second heat exchanger unit is provided to cool the compressed air pre-cooled in the first heat exchanger unit with a cooling medium to cause condensation and dehumidify the compressed air, the first heat exchanger unit and the second heat exchanger unit are disposed adjacent to each other in a vertically long manner and are built into the dehumidification device housing as a vertically long pressure vessel, a first small chamber located below the first heat exchanger section and the second heat exchanger section, into which an air outlet of the second heat exchanger section and an inlet of the reheating flow path are opened, and into which drain water generated by condensation is discharged from a drain outlet provided at a lower end of the first small chamber; a second small chamber located above the first heat exchanger section and the second heat exchanger section, into which an outlet of the reheating flow path opens and into which a compressed air outlet for discharging the secondary-side compressed air to a pneumatic device opens, the second small chamber retaining the compressed air immediately before being discharged; a temperature sensor having a sensing unit disposed on the side of the first small chamber at an air outlet of the second heat exchanger unit, an extended air passage portion extending downward so that an air outlet of the second heat exchanger portion is located below an inlet of the reheating flow passage; a demister disposed at a lower end of the extended air passage portion and configured to separate moisture from the compressed air discharged at an air outlet of the second heat exchanger portion by passing the compressed air therethrough, A compressed air dehumidifier characterized in that the sensing portion at the tip of the temperature sensor is inserted into the demister so as to come into contact with a component constituting the demister.

2. A compressed air dehumidifier in which a heat exchanger is provided in two stages, a first heat exchanger unit and a second heat exchanger unit, inside a dehumidifier housing so as to dehumidify primary-side compressed air introduced from a compressed air device by heat exchange and discharge the dehumidified secondary-side compressed air to pneumatic equipment, the first heat exchanger unit is provided by arranging a pre-cooling flow path for the primary-side compressed air and a reheating flow path for the secondary-side compressed air so as to pre-cool the primary-side compressed air and reheat the secondary-side compressed air so as to intersect, and the second heat exchanger unit is provided to cool the compressed air pre-cooled in the first heat exchanger unit with a cooling medium to cause condensation and dehumidify the compressed air, the first heat exchanger unit and the second heat exchanger unit are disposed adjacent to each other in a vertically long manner and are built into the dehumidification device housing as a vertically long pressure vessel, a first small chamber located below the first heat exchanger section and the second heat exchanger section, into which an air outlet of the second heat exchanger section and an inlet of the reheating flow path are opened, and into which drain water generated by condensation is discharged from a drain outlet provided at a lower end of the first small chamber; a second small chamber located above the first heat exchanger section and the second heat exchanger section, into which an outlet of the reheating flow path opens and into which a compressed air outlet for discharging the secondary-side compressed air to a pneumatic device opens, the second small chamber retaining the compressed air immediately before being discharged; a temperature sensor having a sensing unit disposed on the side of the first small chamber at an air outlet of the second heat exchanger unit, A compressed air dehumidifier characterized in that the temperature sensor is attached by fixing a base portion of the temperature sensor to a portion of the dehumidifier housing that forms the first small chamber.

3. 2. The compressed air dehumidifier according to claim 1, wherein the temperature sensor is attached by fixing a base portion of the temperature sensor to a portion of the dehumidifier housing that forms the first small chamber.

4. The compressed air dehumidifier according to any one of claims 1 to 3, characterized in that the cooling medium is a refrigerant of a refrigeration cycle device including a compressor, a condenser, an expansion valve, and an evaporator, and a component of the second heat exchanger unit is the evaporator.

5. 5. The compressed air dehumidifier according to claim 4, further comprising a control device that controls operation of the refrigeration cycle device based on information detected by the temperature sensor.

6. A compressed air dehumidifier unit in which the compressed air dehumidifier according to claim 4 and the refrigeration cycle device are housed inside a casing, the dehumidifier housing has a compressed air inlet through which compressed air is introduced and a compressed air outlet through which dehumidified compressed air is discharged, the compressed air outlet and an outlet pipe extending from the compressed air outlet are disposed at an upper portion inside the casing, the condenser of the refrigeration cycle device is disposed below the compressed air outlet, and a cooling fan of the condenser is disposed so as to blow air toward the inside of the casing, an exhaust port in the casing for the exhaust air is provided at an upper portion of the casing so that exhaust air generated by air being heated as it passes through the heat exchanger portion of the condenser by the air blown by the cooling fan is exhausted through a space in which the compressed air outlet and the outlet piping are arranged; the compressed air inlet and an inlet pipe extending from the compressed air inlet are disposed at an upper portion inside the casing, the condenser of the refrigeration cycle device is disposed below the compressed air inlet, and a cooling fan of the condenser is disposed so as to blow air toward the inside of the casing, A compressed air dehumidifier unit characterized in that an exhaust port in the casing for the exhaust air is provided at the top of the casing so that the exhaust air generated when air is heated as it passes through the heat exchanger section of the condenser by the blowing of the cooling fan is exhausted through the space in which the compressed air inlet and the inlet piping are arranged.

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