JPH11211367A - Waveform heat transfer unit and heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance a heat transfer efficiency by connecting a pair of parallel waveform plates at an interval to diffuse a liquid to be introduced between the plates by a capillary, thereby increasing a heat transfer area per liquid volume between the plates. SOLUTION: A liquid flowing part 3 has a pipe-like header 3a made of a similar material to a waveform plate 2, and a communicating part 3b for communicating the header 3a with a waveform heat transfer unit 1. A liquid 20 to be supplied to the header 3a is introduced into the unit 1 via the part 3b. A liquid flowing-out part also has a pipe-like header similar to the part 3, and a communicating part for communicating the header within the unit 1. The liquid flowing out from the unit 1 is introduced into the header via the communicating part, and discharged. Thus, a content stayed in the plate 2 is reduced, and a heat transfer area per liquid volume is increased.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a corrugated heat transfer unit used in a heat exchanger and a heat exchanger constituted by arranging a plurality of the corrugated heat transfer units in parallel.

[0002]

2. Description of the Related Art As a heat exchanger for exchanging heat between liquid and liquid or between liquid and gas, there are a multi-tube type, a double-tube type, a dropping type, a plate type and the like. Among them, the plate type is adopted in many fields because of its small size and high heat exchange efficiency. As a conventional plate heat exchanger, for example, a large number of corrugated plates are arranged at predetermined intervals, and a liquid such as a liquid and another liquid or gas to be heat-exchanged therewith are alternately passed between the corrugated plates. There is something.

[0003]

However, in a heat exchanger of the type described above, a constant volume of liquid is always retained between the corrugated plates in order to bring the liquid into contact with the entire heat transfer surface.
A part of the retained liquid is replaced with the supplied liquid. Therefore, there is a problem that the heat transfer area per liquid amount between the corrugated plates is necessarily small, and the heat transfer efficiency is low. In addition, since a relatively large amount of liquid is stored, the water head pressure also increases, so that more reliable measures against liquid leakage are required, and as a result, there is a problem that the apparatus becomes large and the weight increases. Therefore, an object of the present invention is to provide a waveform heat transfer unit that solves such a conventional problem, and a heat exchanger including the waveform heat transfer unit.

[0004]

According to the first aspect of the present invention, a pair of parallel corrugated plates are joined to each other at an interval such that a liquid introduced therebetween is diffused by capillary action. This is a wave heat transfer unit for a heat exchanger. According to the corrugated heat transfer unit, the interval between the pair of corrugated plates has an extremely small value such that the introduced liquid is diffused by capillary action. Therefore, since the amount of liquid staying in the meantime is also small, the heat transfer area per the amount of liquid is significantly increased, so that the heat transfer efficiency can be increased. In addition, the liquid introduced into the corrugated heat transfer unit diffuses to every corner of the heat transfer surface due to the capillary action and passes as a laminar flow,
As described above, since the amount of liquid staying inside is extremely small, the water head pressure also decreases. Therefore, the problem of liquid leakage countermeasures is reduced, and the seal structure when configuring the heat exchanger is simplified.

The invention according to claim 2 is an embodiment of the invention according to claim 1, wherein a liquid inflow portion is provided at one end of the corrugated heat transfer unit and a liquid inflow portion is provided at the other end. An outflow portion is provided. The use of such a corrugated heat transfer unit makes it easier to assemble the heat exchanger. A third aspect of the present invention is a preferred embodiment of the second aspect of the present invention, characterized in that a vertical type in which a liquid inflow portion is located above a corrugated heat transfer unit. It is. In such a vertical waveform heat transfer unit, the liquid is introduced from the upper side and discharged from the lower side, so that the liquid can diffuse and pass through the waveform heat transfer unit more smoothly by the capillary action and the self-weight action. . Therefore, there is an advantage that the head structure is further reduced and the sealing structure is simpler and better. The invention according to claim 4 is a heat exchanger configured by arranging a plurality of the waveform heat transfer units according to claim 2 or 3, wherein a liquid is passed through each waveform heat transfer unit, It is characterized in that a fluid to be heat-exchanged with the liquid is passed between the corrugated heat transfer units. The heat exchanger has a high heat transfer efficiency, is compact and lightweight.

[0006]

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a front view showing an example of a heat exchanger in which a large number of wave-shaped heat transfer units of the present invention are arranged in parallel in a vertical type, FIG. 2 is a cross-sectional view taken along the line II-II, and FIG. FIG. 4 is an enlarged view of a portion of the corrugated plate in FIG. In these figures, each of the wave heat transfer units 1 has a pair of wave plates 2 arranged in parallel. Corrugated plate 2
Is made of a corrugated sheet of a metal having good heat conductivity such as aluminum, brass, stainless steel, etc., and forms a hermetically sealed container by brazing the peripheral portions thereof to each other. A liquid inflow portion 3 and a liquid outflow portion 4 are provided at the upper end and the lower end of the waveform heat transfer unit 1, respectively. The surface of the corrugated plate 2 may be coated with a seawater-resistant or chemical-resistant resin film. The interval between the pair of corrugated plates 2 is an extremely narrow value such that the liquid introduced as described above diffuses to every corner of the heat transfer surface by capillary action, but is usually 0.1 m.
m to about 1.0 mm.

As shown in FIG. 3, the liquid inflow section 3 has a pipe-shaped header made of the same material as the corrugated plate 2.
The liquid 20 supplied to the header 3a through the communication portion 3b as shown by the arrow B in FIG. 1 is composed of a communication portion 3b that communicates the header 3a with the inside of the waveform heat transfer unit 1. 1 is introduced. The liquid outflow portion 4 also includes a pipe-shaped header 4a similar to the liquid inflow portion 3, and a communication portion 4b that communicates the header 4a with the inside of the waveform heat transfer unit 1, and the liquid flowing out of the waveform heat transfer unit 1 The header 4a enters the header 4a via the communication portion 4b and is discharged as shown by an arrow C in FIG.

In this example, header-3a and header-
4a also functions as a spacer between the wave-shaped heat transfer units 1, and a fluid 21 such as another liquid or gas that exchanges heat with the liquid 20 is formed in each wave-shaped space 5 formed by the two points in FIG. Pass like a dashed line. The periphery of the space 5 other than the entrance is sealed by filling a plastic sealing agent 6 around the header-3a (or the header-4a) as shown in FIG. 3, for example. Then, the liquid 20 introduced into the waveform heat transfer unit 1 from the liquid inflow section 3
The heat is exchanged with the fluid 21 flowing laterally while flowing down from the upper side to the lower side as shown by the solid line in FIG. It flows out from 4.

FIG. 5 shows an example of an air-cooled heat exchanger incorporating a plurality of the corrugated heat transfer units 1 shown in FIG. A plurality of corrugated heat transfer units 1 are incorporated in the center of the main body 8 of the heat exchanger 7, and the liquid 20 flows into the corrugated heat transfer unit 1 from the supply unit 9 via the liquid inflow unit 3, and the liquid outflow unit 4 Is discharged from the discharge unit 10 through On the other hand, a gas inlet 11 and a gas outlet 12 are provided on both sides of the waveform heat transfer unit 1 in the main body 8, and a fan 13 is mounted outside the gas inlet 11. Then, a fluid 21 such as external air to be heat-exchanged with the liquid 20 is introduced into the gas introduction unit 11 by the fan 13 and discharged from the gas discharge unit 12 through the space 5 of the waveform heat transfer unit 1.

[0010]

As described above, in the corrugated heat transfer unit according to the first aspect, a pair of parallel corrugated plates are joined to each other at an interval such that the liquid introduced therebetween is diffused by capillary action. Therefore, the amount of liquid staying in the corrugated plate is extremely small. Therefore, the heat transfer area per liquid amount is significantly increased, and high heat transfer efficiency is obtained. Also, the liquid introduced into the corrugated heat transfer unit is diffused to every corner of the heat transfer surface due to its capillary action, passes as a laminar flow, and the amount of liquid staying inside as described above is extremely small. The head pressure also decreases. Therefore, the problem of liquid leakage countermeasures is reduced, and the seal structure when configuring the heat exchanger is simplified.

According to the second aspect of the present invention, the liquid heat transfer unit has a liquid inflow portion at one end and a liquid outflow portion at the other end.
The heat exchanger can be more easily assembled. According to a third aspect of the present invention, the waveform heat transfer unit is of a vertical type in which the liquid inflow portion is located above the waveform heat transfer unit. In such a vertical waveform heat transfer unit, the liquid is introduced from the upper side and discharged from the lower side, so that the liquid can diffuse and pass through the waveform heat transfer unit more smoothly by the capillary action and the self-weight action. . As a result, the head pressure is further reduced, so that the sealing structure may be simpler. Since the heat exchanger according to claim 4 is configured to pass the liquid through each wave-shaped heat transfer unit and to pass the fluid to be heat-exchanged with the liquid between each wave-shaped heat transfer unit, High thermal efficiency, compact and lightweight.

[Brief description of the drawings]

FIG. 1 is a front view showing an example of a heat exchanger in which a large number of waveform heat transfer units of the present invention are arranged in parallel in a vertical type.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is an enlarged view of a portion A in FIG. 2;

FIG. 4 is a partial cross-sectional view further enlarging a corrugated plate portion in FIG. 3;

FIG. 5 is a front view showing an example of an air-cooled heat exchanger using the waveform heat transfer unit of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Corrugated heat transfer unit 2 Corrugated plate 3 Liquid inflow part 3a Header 3b communication part 4 Liquid outflow part 4a Header 4b communication part 5 Space 6 Sealant 7 Heat exchanger 8 Main body 9 Supply part 10 Discharge part 11 Gas introduction part 12 Gas discharge unit 13 Fan 20 Liquid 21 Fluid

Claims (4)

[Claims] 1. A corrugated heat transfer unit for a heat exchanger, wherein a pair of parallel corrugated plates 2 are joined to each other at intervals such that a liquid 20 introduced therebetween is diffused by capillary action. 2. The waveform heat transfer for a heat exchanger according to claim 1, wherein a liquid inflow portion 3 is provided at one end of the waveform heat transfer unit, and a liquid outflow portion 4 is provided at the other end. unit. 3. The wave-shaped heat transfer unit for a heat exchanger according to claim 2, wherein the liquid inflow section 3 is a vertical wave-shaped heat transfer unit located on the upper side. 4. A plurality of corrugated heat transfer units according to claim 2 or 3, wherein a liquid 20 passes through each corrugated heat transfer unit, and heat exchange with the liquid is performed between each corrugated heat transfer unit. A heat exchanger adapted to pass through the fluid 21.