JP2000018882A - Heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat exchanger in which drain is prevented from standing in an outlet side space and dehumidification effect is enhanced. SOLUTION: The heat exchanger 1 comprises a precooling chamber 11 provided with a gas introduction opening 12 and arranged with a heat transfer pipe 14 for preliminary cooling, a main cooling chamber 15 arranged with an evaporator 17 conducting with the precooling chamber 11 and main cooling the gas cooled therein, and an outlet side space 21 conducting with the main cooling chamber 15 through the heat transfer pipe 14 for preliminary cooling and discharging gas cooled in the main cooling chamber 15 to the outside through a gas exhaust opening 22. The heat exchanger 1 is constructed to discharge drain stored in the main cooling chamber 15 to the outside at the time of cooling the gas and an opening 23 for discharging drain to the outside is made in the outlet side space 21.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a main cooling unit provided with a pre-cooling chamber for pre-cooling gas introduced from a gas inlet, and an evaporator for main cooling the gas cooled in the pre-cooling chamber. The present invention relates to a heat exchange device including a chamber, and an outlet-side space for discharging gas cooled in a main cooling chamber to the outside of the device via a gas discharge port.

[0002]

2. Description of the Related Art As a heat exchanger of this type, the applicant has
A device provided with a drain scattering prevention mechanism has already been proposed (Utility Model Registration No. 2558781). As shown in FIG. 4, the heat exchange device 41 includes a cylindrical outer cylinder 2 and a cylindrical inner cylinder 3 disposed inside the outer cylinder 2. The compressed air is communicated through a communication hole 6 formed in a part of the outer wall of the inner cylinder 3 while being separated from each other by a side plate 4 disposed in the outer cylinder 2. In this case, a space surrounded by the inner wall of the outer cylinder 2, the outer wall of the inner cylinder 3 and the side plate 4 forms a pre-cooling chamber 11, and a gas inlet for introducing high-temperature compressed air into the pre-cooling chamber 11. 12 are formed, and a large number of fins 13,
A pre-cooling heat transfer pipe 14 in which a small-diameter inner tube is fitted is provided.

The inner cylinder 3 constitutes a main cooling chamber 15 in which compressed air which has been pre-cooled in the pre-cooling chamber 11 and then sent through the communication hole 6 is mainly cooled. And a cover 18 for preventing scattering of the drain to the pre-cooling heat transfer pipe 14 side, and a drain trap 19 for discharging the drain to the outside of the apparatus. In this case, the evaporator 17 is provided with a plurality of substantially disk-shaped fins 16a in which one of the upper and lower sides is cut out in a crescent shape and a compressed air passage is provided, and the upper and lower sides are alternately inverted. A drain flow hole 20 is formed below the fin 16a. Further, between the fins 16a, 16a, fins 16b, 16b having the same diameter as the fin 16a and having upper and lower portions cut away in a crescent shape in FIG. "Fin 16"
Are also attached.

In the outer cylinder 2, an outlet side space 42 partitioned from the pre-cooling chamber 11 by the inner wall of the outer cylinder 2 and the side plate 4.
The outlet side space 42 communicates with the main cooling chamber 15 via the pre-cooling heat transfer pipe 14 and discharges the compressed air cooled in the main cooling chamber 15 to the outside of the device. A gas outlet 22 is provided.

In the heat exchanger 41, the gas inlet 12
, High-temperature compressed air is introduced into the fins 13, 13,... Of the pre-cooling heat transfer pipe 14.
It passes through the space, and is sent into the main cooling chamber 15 through the communication hole 6 while being pre-cooled. The compressed air sent into the main cooling chamber 15 is rapidly cooled by the evaporator 17 in the main cooling chamber 15 and dehumidified at that time. Next, the dehumidified compressed air passes through the pre-cooling heat transfer pipe 14 and is sent into the outlet side space 42, where the outlet side space 4
The gas is discharged from the second gas discharge port 22 to the outside of the apparatus.

On the other hand, in the pre-cooling chamber 11, when the high-temperature compressed air is cooled, the dew point temperature decreases, so that moisture contained in the high-temperature compressed air is reduced to the fins 13, 13.
13 Condensation as dew water on the surface. Next, the dew condensation water on the surface of the fins 13 becomes water droplets, travels along the fins 13, falls into the space 11a below the pre-cooling chamber 11, and is stored as drain in the space 11a. in this case,
When the drain reaches a predetermined water level in the space 11a, the drain is flooded from the communication hole 6 to the bottom of the main cooling chamber 15, flows through the drain flow hole 20 formed in the fin 16a, and is collected in the drain trap 19. You. On the other hand, also in the main cooling chamber 15, the moisture contained in the compressed air
・ Condensed on the surface as condensation water. The condensed water forms water droplets and travels along the fins 16 to form the main cooling chamber 15.
And flows through the drain flow hole 20 to be collected in the drain trap 19. Next, drain trap 1
When a predetermined amount is stored in 9, the drain falls naturally by its own weight. On the other hand, when the drain is stored above the drain trap 19 in the main cooling chamber 15, the pre-cooling heat transfer pipe 14 for the drain by the compressed air sent into the main cooling chamber 15 is provided.
Prevent splashing to the side.

[0007]

However, the heat exchange device 41 proposed by the applicant has the following problems to be improved. That is, in the heat exchange device 41, the drain is stored in the drain trap 19 in a predetermined amount, and then discharged from the drain trap 19 to the outside of the device. Drain may be stored above the drain trap 19. Even in such a case, the cover 18 prevents the drain from being scattered by the compressed air sent into the main cooling chamber 15. However, when the flow rate of the compressed air suddenly increases, the drain is wound up and scattered by the compressed air, albeit slightly, and the pre-cooling heat transfer pipe 14
May be sent to the outlet side space portion 42 via the
In this case, since a drain trap or the like for discharging the drain to the outside of the apparatus is not provided in the outlet side space 42, the drain may be gradually stored in the outlet side space 42 due to long-term use. is there. In such a case, a small amount of drain evaporates, thereby increasing the humidity of the compressed air dehumidified by the heat exchange device 41, which may cause a decrease in dehumidification efficiency. Furthermore, in an extreme case, there is a possibility that the gas discharge port 22 may be blocked by the drain being stored in the outlet side space portion 42. Therefore, it is preferable that these situations can be avoided.

[0008] The present invention has been made in view of the above-described improvements, and has as its main object to provide a heat exchange device capable of preventing drain from being stored in an outlet side space and improving a dehumidifying effect. And

[0009]

According to a first aspect of the present invention, there is provided a heat exchange apparatus comprising: a pre-cooling chamber in which a gas inlet is formed and a pre-cooling heat transfer pipe is disposed; The main cooling chamber provided with an evaporator for main cooling the gas cooled in the pre-cooling chamber is communicated with the main cooling chamber via the pre-cooling heat transfer pipe and cooled in the main cooling chamber. An outlet-side space for discharging the discharged gas to the outside of the device via the gas discharge port, and a heat exchange device configured to be able to discharge the drain stored in the main cooling chamber to the outside of the device when the gas is cooled, A drain outlet for discharging the drain to the outside of the apparatus is formed in the outlet side space.

According to a second aspect of the present invention, in the heat exchange apparatus of the first aspect, the main cooling chamber communicates with the outlet side space, and the drain stored in the main cooling chamber is discharged to the drain outlet. A drain tube for draining.

According to a third aspect of the present invention, there is provided a heat exchange apparatus according to the first or second aspect, further comprising a drain trap for accumulating and discharging the drain discharged from the drain outlet.

According to a fourth aspect of the present invention, there is provided a heat exchange apparatus according to the second or third aspect, wherein the thin tube for drain discharge is provided in a main body of the apparatus.

According to a fifth aspect of the present invention, there is provided a heat exchange device according to any one of the first to fourth aspects, wherein a pre-cooling heat transfer pipe is provided near an open end of the narrow tube for drain discharge on the main cooling chamber side. A drain scattering prevention mechanism for preventing the drain from scattering to the side is provided.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the heat exchange device according to the present invention will be described below with reference to the accompanying drawings. Note that the same components as those of the heat exchange device 41 that have already been developed by the applicant are denoted by the same reference numerals, and redundant description will be omitted.

As shown in FIGS. 1 and 2, the heat exchange device 1
A metal outer cylinder 2 formed in a cylindrical shape, and a metal inner cylinder 3 formed in a cylindrical shape and disposed eccentrically in the outer cylinder 2 are provided. The outer cylinder 2 and the inner cylinder 3 are
, And as shown in FIG. 2,
It is configured such that compressed air communicates through a communication hole 6 formed in a part of the outer wall of the inner cylinder 3. Note that, in the figure, illustration of the fins 13 and 16b is omitted for easy understanding. On the other hand, as shown in FIG. 1, a pre-cooling chamber 11 in which a gas inlet 12 for introducing high-temperature compressed air is formed and a pre-cooling heat transfer pipe 14 is disposed in the outer cylinder 2 is provided. Is formed. The inner cylinder 3 constitutes a main cooling chamber 15, and the main cooling chamber 15 has an evaporator 1 therein.
7, and a flat cover 18 corresponding to the drain scattering prevention mechanism in the present invention. In this case, the evaporator 17 has, similarly to the heat exchange device 41, the fin 16a having the drain passage hole 20 formed therein as shown in FIG.
A large number of oval-shaped fins 16b having the same diameter as the fins 16a and having upper and lower parts cut away in a crescent shape in FIG.

On the other hand, an outlet-side space 21 is formed in the outer tube 2 by the inner wall of the outer tube 2 and the side plate 4, and the outlet-side space 21 is interposed via a pre-cooling heat transfer pipe 14. A gas discharge port 22 is formed which communicates with the main cooling chamber 15 and discharges the compressed air cooled in the main cooling chamber 15 to the outside of the apparatus. A drain discharge port 23 for discharging the drain generated in the heat exchange device 1 to the outside of the heat exchange device 1 is formed in the outlet side space portion 21.
A very small amount of water droplets scattered by the flow of the compressed air from the main cooling chamber 15 through the main cooling chamber 15 can be discharged from the drain discharge port 23. Furthermore, a drain discharge pipe 24 formed of, for example, a thin metal tube is provided between the outlet side space 21 and the main cooling chamber 15. In this case, the drain discharge pipe 24 is formed to have a diameter such that there is no problem even if the compressed air is bypassed between the main cooling chamber 15 and the outlet side space 21, and the open end at one end is formed. The main cooling chamber 1 is located within the opening of the drain discharge port 23, and the opening end on the other end side is located below the cover 18 of the main cooling chamber 15.
5 is disposed so as to face the bottom.

A float type drain trap 25 is provided below the drain outlet 23 in the outlet side space 21.
Are provided. In this case, as shown in FIG. 3 (a), the drain trap 25 has a baffle 31 for guiding the drain downward along a tapered surface and preventing a backflow of the drain, and a predetermined amount of drain inside the drain trap. A float 32 for opening the tip of the drain trap 25 to drain the drain when the water is stored, and a drain outlet 23
And the drain trap 25
And at least a diaphragm 33 for reducing a communication area between the internal space and the space in the outlet side space portion 21. With this configuration, the drain trap 25 reliably discharges the drain to the outside of the apparatus while maintaining the confidentiality of the outlet side space 21.

In this heat exchanger, when high-temperature compressed air heated to, for example, about 70 ° C. is introduced from the gas inlet 12, the high-temperature compressed air is supplied to the fins 13, 13 of the pre-cooling heat transfer pipe 14. .. It passes through the space and is sent to the main cooling chamber 15 through the communication hole 6. At this time, the high-temperature compressed air is, for example, 3
It is pre-cooled to about 0 ° C. The compressed air sent into the main cooling chamber 15 is rapidly cooled to, for example, about 10 ° C. by the evaporator 17 in the main cooling chamber 15, and the compressed air dehumidified at the time of the cooling is subjected to heat transfer for preliminary cooling. Pipe 14
The inside is conducted and is sent to the outlet side space 21. At this time, the compressed air is heat-exchanged with the high-temperature compressed air flowing around the pre-cooling heat transfer pipe 14 to be heated to, for example, about 35 ° C., and becomes compressed air having a lower relative humidity. The gas is discharged to the outside of the apparatus from the gas discharge port 22 formed at the bottom.

On the other hand, in the pre-cooling chamber 11, when the high-temperature compressed air is cooled, moisture contained in the high-temperature compressed air condenses on the surfaces of the fins 13, 13,. Next, the condensed water becomes water droplets, travels along the fins 13, falls into the space 11a below the pre-cooling chamber 11, and is stored as drain in the space 11a. In this case, when the drain reaches a predetermined water level in the space 11a, the drain is flooded from the communication hole 6 to the bottom of the main cooling chamber 15 and stored in the bottom of the main cooling chamber 15 below the cover 18 in the main cooling chamber 15 through the drain circulation hole 20. Is done. On the other hand, also in the main cooling chamber 15, the moisture contained in the compressed air is condensed on the surfaces of the fins 16, 16,. It falls to the bottom of the cooling chamber 15 and is stored at the bottom of the main cooling chamber 15 below the cover 18 through the drain passage hole 20.

Next, when a predetermined amount of the drain is stored in the bottom of the main cooling chamber 15 below the cover 18, the drain is discharged by the drain discharge pipe 24 due to the pressure difference between the main cooling chamber 15 and the outlet space 21. Suctioned and drained pipe 24
Through the outlet side space 21 side. After this,
The drain is drained from the drain outlet 23 and stored in the drain trap 25. When a predetermined amount of drain is stored in the drain trap 25, the float 31 rises as shown in FIG.
Is opened, and the drain falls naturally from the opening.

At this time, the pressure difference in the main cooling chamber 15 and the pressure in the drain trap 25 is remarkable because the tip of the drain trap 25 is opened and the pressure in the outlet side space 21 decreases. Becomes For this reason, the drain stored in the bottom portion of the main cooling chamber 15 below the cover 18 is caused by the drain discharge pipe 24 due to the pressure difference.
It is more strongly sucked and sent to the outlet side space 21 side. Further, at this time, the communication area between the space of the outlet side space 21 and the internal space of the drain trap 25 is reduced by the throttle 33 of the drain trap 25,
The pressure difference between the air pressure in the outlet side space 21 and the air pressure in the drain trap 25 also becomes significant. For this reason, the exit side space 21
Is drained into the drain trap 25 and stored there. Therefore, the drain in the outlet side space 21 can be more quickly and reliably collected in the drain trap 25 as compared with the water collection by natural fall.

On the other hand, when the drain is stored at the bottom of the main cooling chamber 15, the cover 18 prevents the compressed air sent into the main cooling chamber 15 from being wound up, thereby pre-cooling the drain. Drain scattering to the heat transfer pipe 14 side is prevented. In this case, a very small amount of drain may be wound up and scattered by the compressed air, and may be sent to the outlet side space 21 via the pre-cooling heat transfer pipe 14. At this time, the drain collides with the inner wall of the outer cylinder 2 facing the opening surface of the pre-cooling heat transfer pipe 14, travels along the inner wall, falls to the drain outlet 23 side, and then collects in the drain trap 25. Be watered. Thereafter, as described above, the drain is drained to the outside of the apparatus from the tip of the drain trap 25 together with the drain fed through the drain discharge pipe 24. As a result, according to this heat exchange device 1, it is possible to prevent the drain from being stored in the outlet side space portion 21, and thereby to improve the dehumidifying effect.

The present invention is not limited to the configuration shown in the above embodiment of the present invention. For example, in the embodiment of the present invention, an example in which the drain discharge tube 24 corresponding to the drain discharge thin tube of the present invention is disposed in the outer cylinder 2 is described. It can also be arranged in. The outlet side space 21 and the main cooling chamber 1
By arranging a drain trap in both of them, the drain discharge pipe 24 can be made unnecessary. However,
A drain discharge pipe 24 is provided and a drain trap 25 is provided.
The drain can be drained from one place by arranging only one in the outlet side space portion 21, thereby making it possible to easily configure a drain wastewater treatment facility. Further, the drain trap 25 is not limited to the float type,
Various structures such as a solenoid valve system and a manual system can be adopted.

[0024]

As described above, according to the heat exchanger of the first aspect, the drain outlet capable of discharging the drain is formed in the outlet side space, so that the pre-cooling transfer from the main cooling chamber side. Even if the drain is sent to the outlet side space portion through the heat pipe, it is possible to prevent the drain from being stored in the outlet side space portion, thereby improving the dehumidifying effect.

According to the second aspect of the present invention, a drain is provided for communicating the main cooling chamber with the outlet side space and discharging the drain stored in the main cooling chamber to the drain outlet. With the provision of the thin tube, the drain stored in the main cooling chamber can be reliably and gently discharged to the outside of the apparatus through the outlet side space portion with a simple structure.

Further, according to the heat exchanger of the third aspect, the drain trap which accumulates and discharges the drain discharged from the drain discharge port is provided, so that the airtightness of the outlet side space is maintained while the drain is maintained. Can be reliably discharged to the outside of the apparatus.

According to the fourth aspect of the present invention, the drain tube is provided in the main body of the apparatus, so that the drain tube does not protrude out of the outer cylinder. It can be made compact.

Further, according to the heat exchanger of the fifth aspect, the drain for preventing the drain from scattering to the pre-cooling heat transfer pipe near the open end of the narrow drain discharge tube on the main cooling chamber side. By providing a scattering prevention mechanism, it is possible to prevent the drain from being sent into the outlet side space by compressed air and the like, and as a result, the drain can be discharged more gently to the outside of the apparatus. The effect can be further improved.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a heat exchange device according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA in FIG.

3A is a cross-sectional view of a drain trap in a state where the drain is stored, and FIG. 3B is a cross-sectional view of the drain trap in a state where the drain is drained.

FIG. 4 is a longitudinal sectional view of a heat exchange device already proposed by the applicant.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Heat exchanger 2 Outer cylinder 3 Inner cylinder 11 Pre-cooling chamber 12 Gas inlet 14 Pre-cooling heat transfer pipe 15 Main cooling chamber 17 Evaporator 18 Cover 21 Outlet side space 22 Gas outlet 23 Drain outlet 24 Drain discharge Tube 25 Drain trap

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Nobu Nishijima 246 Koyuki, Oaza, Suzaka-city, Nagano F-term in Orion Machinery Co., Ltd. (Reference) 3L103 AA05 AA22 AA38 BB14 CC18 CC22 DD06 DD33 DD38 DD62

Claims (5)

[Claims] A pre-cooling chamber having a gas inlet formed therein and a pre-cooling heat transfer pipe disposed therein; and an evaporator for communicating with the pre-cooling chamber to mainly cool the gas cooled in the pre-cooling chamber. A main cooling chamber in which a vessel is provided, and the main cooling chamber communicates with the main cooling chamber via the pre-cooling heat transfer pipe, and the gas cooled in the main cooling chamber is discharged to the outside of the apparatus through a gas discharge port. An outlet side space portion, wherein a drain stored in the main cooling chamber can be discharged to the outside of the device when the gas is cooled, wherein a drain outlet for discharging the drain to the outside of the device. Is formed in the outlet-side space. 2. A drain discharge narrow tube which communicates the main cooling chamber with the outlet side space and discharges the drain stored in the main cooling chamber to the drain outlet. The heat exchange device according to claim 1, wherein 3. The heat exchanger according to claim 1, further comprising a drain trap for accumulating and discharging the drain discharged from the drain outlet. 4. The heat exchange device according to claim 2, wherein the drain discharge thin tube is provided in a main body of the device. 5. A drain scattering prevention mechanism for preventing the drain from scattering toward the pre-cooling heat transfer pipe near the open end of the drain discharge narrow tube on the main cooling chamber side. The heat exchange device according to any one of claims 1 to 4, wherein: