JP2604531Y2 - Heat exchanger structure - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method in which an inner cylinder is inserted into a side plate provided in a cylindrical outer cylinder, an evaporator of a refrigeration cycle is disposed in the inner cylinder, and a space between the outer cylinder and the inner cylinder is provided. The present invention relates to an improvement in the structure of a pre-cooling chamber in a heat exchanger having a plurality of heat transfer pipes arranged in the pre-cooling chamber.

[0002]

2. Description of the Related Art As a structure of a pre-cooling chamber in a conventionally used heat exchanger, a plurality of cylindrical heat transfer pipes are provided between side plates of a chamber formed by a tube bundle plate and an inner tube and an outer tube. It is known that the main mounting is performed, high-temperature compressed air is introduced into the pre-cooling chamber, and cooling air is guided to a heat transfer pipe. In this structure, high-temperature compressed air flows from the air inlet to the outer periphery of the heat transfer pipe, and cooling air after dehumidification flows in the heat transfer pipe, thereby cooling the high-temperature air and heating and drying the cooling air. In addition, in the conventional heat exchanger,
The heat transfer pipe is designed to be about 50% wider than the cross-sectional area of the compressed air passage in a plane orthogonal to the longitudinal direction and the sum of the cross-sectional areas of the plurality of heat transfer pipes in the same plane.

[0003]

However, in the case of such a conventional structure, the cooling air flows in the heat transfer pipe, but due to the effect of the flow resistance, the speed is the highest near the center axis of the heat transfer pipe. The resistance around the inner wall of the heat transfer pipe tends to be stronger and slower earlier. Therefore, there is a disadvantage that the heat exchange rate is low and the pre-cooling cannot be performed sufficiently. In view of the disadvantages of the related art, an object of the present invention is to improve the heat exchange rate with a relatively simple structure in a conventional structure for performing pre-cooling using a heat transfer pipe.

[0004]

That is, in the invention of claim 1, an inner cylinder is inserted into a side plate provided in a cylindrical outer cylinder, and an evaporator of a refrigeration cycle is arranged in the inner cylinder. In a heat exchanger in which a plurality of heat transfer pipes are arranged in a pre-cooling chamber between the inner tube and the heat transfer pipe, the heat transfer pipe is formed of a twisted pipe, and both ends or one end of which is closed in the heat transfer pipe. A heat exchanger structure wherein the sum of the effective cross-sectional areas of the heat transfer pipes in a plane perpendicular to the longitudinal direction is equal to the cross-sectional area of the air passage flowing around the outer circumference of the heat transfer pipes. The invention of 2 is that the inner cylinder is inserted into the side plate provided in the cylindrical outer cylinder, the evaporator of the refrigeration cycle is arranged in the inner cylinder, and the heat is transferred to the pre-cooling chamber between the outer cylinder and the inner cylinder. In a heat exchanger in which a plurality of pipes are arranged, both ends or one end are closed in the heat transfer pipe. Corrugated sheet by dividing the outer periphery of the heat transfer pipe was inserted the inner tube with the corrugated plate has the structure of the heat exchanger space for covering the heat transfer pipe and an air passage of the hot compressed air.

[0005]

With the device according to the present invention, the fluid flows through the space formed by the heat transfer pipe and the inner tube because the inner tube whose both ends or one end is closed is inserted into the heat transfer pipe. At this time, since the vicinity of the central axis of the heat transfer pipe is occupied by the inner tube, air flows on the inner wall side of the heat transfer pipe, and air flowing on the outer circumference of the heat transfer pipe Efficient heat exchange becomes possible. The heat transfer pipe is a twisted pipe
According to the invention of claim 1, since the air flow is a spiral flow,
Make the air on the inner wall of the heat transfer pipe flow without stagnation
It becomes possible. According to the invention of claim 2, the heat transfer pipe is
Cover with corrugated sheet, and use this space as an air passage for hot compressed air.
Therefore, heat exchange with cooling air flowing in the heat transfer pipe
It can be done smoothly.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the illustrated embodiments. FIG. 1 is a cross-sectional view of a heat exchanger. Inside a cylindrical outer cylinder 1, two tube bundle plates, side plates 2 and 3, are mounted so as to be in contact with an inner wall surface. Has an inner cylinder 4 inserted therein. Reference numeral 5 denotes an evaporator mounted in the inner cylinder 4, reference numeral 6 denotes a heat transfer pipe inserted into holes formed in the side plates 2 and 3, and an outer periphery of the heat transfer pipe 6 is partitioned by a corrugated plate 7. Have been. In this embodiment, since the inner cylinder 4 is mounted eccentrically on the side plates 2 and 3, the center of the outer cylinder is arranged so that the heat transfer pipes 6 arranged in the space between the inner cylinder 4 and the outer cylinder 1 can be evenly arranged. A partition plate 8 having a semicircular cross section is mounted at a position where the axes are equidistant. In this embodiment, a small-diameter inner tube 6a whose both ends or one end is closed is inserted into the heat transfer pipe 6, and is formed between the effective cross-sectional area of the heat transfer pipe 6, that is, the torsion pipe 6 and the inner tube 6a. The cross-sectional area of the portion through which the heat exchange fluid passes is concentrated on the inner wall side.
Incidentally, 9 is a compressed air inlet and 10 is a dry air outlet. Reference numeral 12 denotes a drain trap for discharging the drain collected below the outer cylinder to the outside.

FIG. 3 shows another embodiment of the heat transfer pipe, wherein the heat transfer pipe 6 is constituted by a twisted pipe.
An inner tube 6 a is inserted into the torsion pipe 6. In the present embodiment, the inner tube 6a is inserted and fitted, and then both ends are crushed to form a single character, so that the crushed portion is engaged with the inner wall of the torsion pipe 6. These torsion pipes are inserted into holes provided in the side plates 2 and 3, and two pipes are arranged at equal intervals in a radial direction from the center axis of the outer cylinder 1 (a total of 20 pipes) as shown in FIG. The pipes 6 are each covered with a corrugated sheet 7 two by two.
The space where the corrugated sheet 7 covers the heat transfer pipe 6 is used as an air passage for high-temperature compressed air by providing a communication hole as appropriate on the side surface of the. Also, the cross-sectional area of the passage of the air flowing on the outer periphery of the heat transfer pipe 6 and the sum of the cross-sectional areas of a plurality of portions formed between the torsion pipe 6 and the inner tube 6a through which the heat exchange fluid passes are substantially equal. It is configured. In this embodiment, the inner tube 6a is inserted into the heat transfer pipe 6. However, the present invention is not limited to this. It goes without saying that a cylindrical one may be inserted. .

In the apparatus according to the present embodiment having the above-described configuration, the high-temperature compressed air flowing from the air inlet 9 is:
In a pre-cooling chamber surrounded by the side plates 2 and 3, the inner cylinder 4, the partition plate 8 and the outer cylinder 1, pre-cooling is performed by exchanging heat with cooling air flowing in the heat transfer pipe 6. On the other hand, the dehumidified and cooled air flowing in the heat transfer pipe 6 exchanges heat with the air flowing on the outer circumference of the heat transfer pipe 6 and is reheated, and becomes low relative humidity air and is discharged from the air outlet 10. Is done.

However, in the apparatus according to this embodiment,
Since the passage cross-sectional area of the air flowing through the outer circumference of the heat transfer pipe 6 and the sum of the effective cross-sectional areas of the plurality of heat transfer pipes 6 are substantially equal, the air flowing through the outer circumference of the heat transfer pipe 6 is The speed of the air flowing through the heat transfer pipes is almost equal, and as a result, the heat exchange amount is large. Further, an inner tube 6a having both ends or one end closed in the heat transfer pipe 6
The air flow does not flow near the center axis of the pipe, but flows near the inner peripheral wall of the heat transfer pipe, and the air flow does not stay. Therefore, the heat exchange rate increases.

Further, in the second embodiment in which the heat transfer pipe 6 is formed of a twisted pipe, the air flowing in the pipe 6 has a helical flow, so that the air flow is uniformly agitated and excellent heat exchange is achieved. The air flowing around the outer periphery can be efficiently cooled, and the air flowing through the heat transfer pipe 6 can be efficiently reheated.

The corrugated plate 7 is provided with an appropriate ventilation hole on its side surface to exchange heat between the high-temperature compressed air flowing from the air inlet as a meandering flow and the cooling air flowing through the heat transfer pipe 6 many times. Can be pre-cooled well.

[0012]

As described above, the structure of the heat exchanger according to the present invention, by inserting the inner tube into the heat transfer pipe, makes the flow of air flowing through the inner wall more Side can be guided to increase the heat exchange rate. In the case where the sum of the effective cross-sectional areas of the plurality of heat transfer pipes is made equal to the cross-sectional area of the passage of the air flowing through the outer circumference of the heat transfer pipe 6, the flow rate of the air flowing through the outer circumference of the heat transfer pipe and the flow rate of the air flowing inside the heat transfer pipe are reduced. The flow rates are equal, resulting in excellent heat exchange efficiency. Further, in the case where the heat transfer pipe is formed of a twisted pipe, the air flow becomes a spiral flow, and air that easily stays on the inner wall of the heat transfer pipe can be removed, so that the heat exchange efficiency can be further improved.

[Brief description of the drawings]

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

FIG. 2 is a sectional view of the device of FIG. 1 taken along the line AA.

FIG. 3 is a longitudinal sectional view of an apparatus showing another embodiment of the heat transfer pipe.

4 is a sectional view of the device according to FIG. 3, taken along line BB.

[Explanation of symbols]

 Reference Signs List 1 outer tube 2, 3 side plate 4 inner tube 5 evaporator 6 heat transfer pipe 7 corrugated plate 8 partition plate 9 compressed air inlet 10 air outlet 12 drain trap

Continuation of front page (56) References JP-A-5-39990 (JP, A) JP-A-56-16090 (JP, A) JP-A-5-39992 (JP, A) JP-A-5-272883 (JP) , A) (58) Field surveyed (Int. Cl. ⁷ , DB name) F28D 7/12 B01D 53/26 F28F 1/40

Claims (2)

(57) [Scope of request for utility model registration] 1. An inner cylinder is inserted into a side plate provided in a cylindrical outer cylinder, an evaporator of a refrigeration cycle is arranged in the inner cylinder, and the power is transferred to a pre-cooling chamber between the outer cylinder and the inner cylinder. In a heat exchanger including a plurality of heat pipes, the heat transfer pipe is formed of a twisted pipe, and an inner tube whose both ends or one end is closed is inserted into the heat transfer pipe, and a surface orthogonal to the longitudinal direction. Wherein the sum of the effective cross-sectional areas of the plurality of heat transfer pipes is equal to the cross-sectional area of the air passage flowing around the heat transfer pipe on the same orthogonal plane. 2. An inner cylinder is inserted into a side plate provided in a cylindrical outer cylinder, an evaporator of a refrigeration cycle is disposed in the inner cylinder, and the power is transferred to a pre-cooling chamber between the outer cylinder and the inner cylinder. In a heat exchanger including a plurality of heat pipes, both ends or one end of the heat pipe is provided.
The closed inner tube is inserted and the heat transfer pipe is inserted.
Corrugated sheet covers the heat transfer pipe
The structure of the heat exchanger, characterized in that the air space is an air passage for high-temperature compressed air .