JPH0419338Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention is directed to a sealed casing, for example, for cooling the inside of a sealed casing such as a control panel, using a so-called heat pipe formed from a flat perforated tube. related to heat exchangers.

[Prior Art] Conventionally, heat exchangers that use a heat pipe are known to cool the air inside a sealed casing of various control panels, switchboards, etc. to a predetermined temperature or lower. Such a heat exchanger usually has a working fluid such as water or methyl alcohol sealed inside, and a heat absorbing part of a heat pipe with one end as a heat absorbing part and the other end as a heat exhausting part, in a sealed case. It is inserted into the body, while the heat exhaust part is exposed outside the sealed casing. In this case, the working fluid in the heat absorption section evaporates while absorbing the heat of the internal air whose temperature has increased inside the sealed casing as latent heat of evaporation, rises in the heat pipe, and reaches the heat exhaust section. This cools the internal air. On the other hand, the working fluid is cooled by external air in the heat exhaust section, condenses and liquefies, flows through the heat pipe, and returns to the heat absorption section again. By repeating such operations, the inside of the sealed casing is cooled to a predetermined temperature or lower.

As mentioned above, for example, "cooling device"
(Japanese Unexamined Patent Publication No. 124994/1983) etc. have been proposed.
That is, a heat pipe having heat absorption fins and heat radiation fins is arranged adjacent to each other in the longitudinal direction, an internal electric fan is placed on the heating part side, and an external electric fan is placed on the heat radiation part side. This is a technology in which the arranged heat pipes and internal and external electric fans are housed in a heat absorption chamber and a heat radiation chamber formed on one side wall of a sealed box.

[Problems to be solved by the invention] By the way, the heat pipe in the prior art was composed of a plurality of circular tubes. Therefore, in order to improve thermal efficiency, the circular pipes should be arranged in multiple stages, such as in a staggered arrangement, in the flow direction of the internal air blown by the internal electric fan or the external air blown by the external electric fan. It was necessary to place it. Therefore, as the volume of the portion where the heat pipes are arranged increases, the depth of the heat exchanger in particular increases, resulting in an increase in the size of the heat exchanger.

Another problem was that the degree of freedom in design was limited when considering both the realization of smooth air flow with little pressure loss during circulation and the arrangement of heat pipes that contributed to space savings.

Furthermore, since multiple circular tubes are arranged in multiple stages, the structure of the heat exchanger becomes complicated.

Further, when a plurality of circular tubes are arranged in multiple stages, the flow of internal air blown by the internal electric fan and external air blown by the external electric fan is disturbed by the circular tubes arranged as described above. For this reason,
There was also the problem that unless measures such as increasing the air blowing capacity of electric fans were taken, sufficient air volume for heat exchange would not be obtained, which would impede improvements in thermal efficiency.

The object of the present invention is to provide a side wall-mounted heat exchanger for a closed casing, which is thin and has a small depth, has high thermal efficiency, and has a high degree of freedom in design.

Structure of the invention [Means for solving the problem] The present invention was made to solve the above problem.
A heat exchanger for a sealed casing that is installed on a side wall of a sealed casing and performs heat exchange between the inside of the sealed casing and the outside, the heat exchanger comprising: an endothermic chamber communicating with the inside of the sealed casing; a heat exhaust chamber that is isolated from the heat absorption chamber by a flat hollow tube and opened to the outside of the sealed casing; and a closed flat porous tube provided within the heat absorption chamber, each hole of which is communicated with each other at one end; Each hole is connected to the flat hollow tube at the other end so as to communicate with the flat hollow tube, and each hole of the sealed flat porous tube is connected at one end to the heat absorption section that absorbs heat inside the heat absorption chamber and the hole of the sealed flat porous tube provided inside the heat exhaust chamber. The flat hollow tube is connected to communicate with the flat hollow tube at a position at least in the flat direction from the connection position of the heat absorption part of the flat hollow tube, and the heat is exhausted inside the heat exhaust chamber. a flat heat pipe formed from a heat exhaust section; fins disposed on the heat pipe; and fins provided adjacent to the heat absorption section in the longitudinal direction within the heat absorption chamber, and discharging the air inside the sealed casing. an endothermic blower that circulates air along the flat direction of the heat absorption part of the flat heat pipe; The gist of the present invention is a heat exchanger for a closed casing, characterized by comprising: an exhaust heat blower that causes the heat to flow along the flat direction of the exhaust heat section of a heat pipe;

[Function] The heat exchanger for a closed casing of the present invention has a heat absorbing section, which is arranged in a heat absorbing chamber, and has a heat absorbing section in which each hole of a sealed flat perforated tube is communicated with each other at one end, and a heat exhausting chamber. A flat heat pipe provided with fins is formed by connecting a heat exhaust section consisting of a flat porous tube arranged and sealed to a flat hollow tube that blocks off the heat absorption chamber and the heat exhaust chamber. An endothermic blower provided adjacent to the heat absorption section in the longitudinal direction blows air inside the sealed casing along the flat direction of the heat absorption section, while an endothermic blower provided adjacent to the longitudinal direction of the heat absorption section of the flat heat pipe blows the air inside the sealed casing along the flat direction of the heat absorption section. A heat exhausting blower provided in the heat exhausting section functions to blow air outside the sealed casing along the flat direction of the heat exhausting section.

Here, the flat perforated pipe was installed parallel to the air blowing direction, which reduces pressure loss during air flow.
A predetermined air volume can be secured relatively easily.

In other words, heat exchange is performed by smoothly circulating an appropriate amount of air along the flat heat absorption and heat exhaust parts of a heat pipe, which is formed by connecting a heat absorption part and a heat exhaust part made of flat porous pipes with a flat hollow tube. At the same time, the positional relationship between the heat absorbing part and the heat exhausting part can be set relatively freely depending on the connection position to the flat hollow tube.

Therefore, the heat exchanger for a closed casing of the present invention has a structural feature in which the flat perforated tubes are communicated with each other through the flat hollow tube, thereby realizing miniaturization of the heat exchanger and simplification of the configuration. It also works to improve its design freedom and thermal efficiency in heat exchange. The technical problems of the present invention are solved by each component of the present invention acting as described above.

[Example] Next, a preferred example of the present invention will be described in detail based on the drawings. FIG. 1 shows a front view of a side wall-mounted heat exchanger for a closed case, which is an embodiment of the present invention, and FIG. 2 shows a right side view thereof. Note that the scale differs for each figure.

As shown in Fig. 1, a heat exchanger 1 for a closed case
These include a heat absorption chamber 4 provided in the lower part of the casing 3 and provided with a flange 2, a heat exhaust chamber 6 provided in the upper part of the casing 3 and isolated from the heat absorption chamber 4 by a flat hollow tube 5, and It is arranged in the heat absorption chamber 4 and is made of an extruded flat porous tube, and the upper end thereof is connected to the flat hollow tube 5.
Heat absorption parts 7a, 8a, 9a, 10a, 1 communicating with
1a, and heat exhaust parts 7b, 8b, 9b, 10b, and 11b, which are arranged in the heat exhaust chamber 6 and are made of extruded flat porous tubes and whose lower ends communicate with the flat hollow tube 5. pipe 7, 8, 9, 10, 1
1. The corrugated fins 12 disposed on the heat pipes 7, 8, 9, 10, 11, the heat absorption blower 13 disposed in the heat absorption chamber 4, and the exhaust heat disposed in the heat exhaust chamber 6. It is composed of a heat blower 14. Heat absorption parts 7a, 8a, 9a, 10a, 11a and heat exhaust parts 7b, 8b, 9b, 10b, 11b made of the flat hollow tube 5 and extruded flat porous tubes,
Further, the heat pipes 7, 8, 9, 10, 11 and the corrugated fins 12 are each bonded by a vacuum method, a fluxless brazing method, an adhesive having good thermal conductivity, or the like. The flat hollow tube 5, the heat pipes 7, 8, 9, 10, 11, and the corrugated fin 12 are all made of pure aluminum or an aluminum alloy.

Next, since the structures of the heat pipes 7, 8, 9, 10, and 11 are all the same, the heat pipe 11 will be explained as an example. As shown in FIG. 2, the heat pipe 11 includes a heat absorption section 11 made of an extruded flat porous tube.
a, a heat exhaust section 11b, and a flat hollow tube 5. That is, the lower end side of the heat absorption section 11a is communicated with the header 15, the upper end side is communicated with the flat hollow tube 5, the upper end side of the heat exhaust section 11b is communicated with the header tube 16, and the lower end side is communicated with the flat hollow tube 5. It is connected to 5.

As shown in the cross-sectional view of FIG.
Seven pipes 32a, 32b, 32c, 32d, 32e,
It is divided into 32f and 32g. Note that the inside of the heat exhaust section 11b has a similar structure.

Further, the lower end side of the heat absorbing portion 11a communicates with the header pipe 15 to form a liquid reservoir, as shown in the longitudinal cross-sectional view of FIG. The header pipe 15 is sealed by welding or the like after injecting a working fluid such as Freon or alcohol. Here, the connecting parts 41 and 42 between the heat absorbing part 11a and the header pipe 15 are joined by brazing. In addition, the heat exhaust part 11b and the header pipe 1
The connection part with 6 has a similar structure.

Furthermore, the upper end side of the heat absorption part 11a and the heat exhaust part 11b
As shown in the longitudinal cross-sectional view of Fig. 5, the lower end side of
They communicate via a flat hollow tube 5. That is,
The upper end side of the heat absorption part 11a is connected to the left side in the flat direction from the center part of the flat hollow tube 5, and each hole 32a, 32
b, 32c, 32d, 32e, 32f, and 32g communicate with the hollow portion 51 of the flat hollow tube 5. On the other hand, the lower end side of the heat exhaust part 11b is connected to the right side in the flat direction from the center of the flat hollow tube 5, and each hole 34a, 3
4b, 34c, 34d, 34e, 34f, 34g
is in communication with the hollow part 51 of the flat hollow tube 5. In this way, the heat absorbing part 11a and the heat exhausting part 11b are connected to positions separated from each other in the flat direction of the flat hollow tube 5. Note that the connecting portions 52 and 53 between the heat absorbing portion 11a and the flat hollow tube 5 and the connecting portions 54 and 55 between the heat exhausting portion 11b and the flat hollow tube 5 are both joined by brazing.

Heat exchanger 1 for closed case configured as above
As shown in FIG. 2, is installed on the side wall of the sealed casing 21 to perform heat exchange. That is, an opening 22 is provided in the side wall of the sealed casing 21 at a position facing the heat absorption chamber 4 . The heated air inside the sealed casing 21 is heated through the opening 2 by the action of the heat-absorbing blower 13.
2, it circulates inside the heat absorption chamber 4 in the direction shown by arrow A and returns to the inside of the sealed casing 21 again. During this time,
Heated air is fed through flat heat absorbing parts 7a, 8a, 9a, 10.
a, 11a, the header pipe 15
The heat is absorbed by the working fluid stored in the liquid reservoir inside and is cooled. On the other hand, the working fluid evaporates into a gas phase, and the heat absorption parts 7a, 8a, 9a, 10a, 1
1a through flat hollow tubes 5 to exhaust heat parts 7b and 8.
It rises to b, 9b, 10b, 11b. On the other hand, the low temperature air outside the sealed casing 21 is transferred to the exhaust heat blower 14.
Due to this action, the heat is circulated inside the heat exhaust chamber 6 in the direction shown by the arrow B and is discharged to the outside again. During this time, the low-temperature air flows through the flat heat exhaust portions 7b, 8b, 9b, 10b,
11b, and the heat exhaust portions 7b, 8
b, 9b, 10b, and 11b to cool the working fluid in the gas phase rising inside. Therefore, the working fluid returns to the liquid phase by exhausting heat to low-temperature air, and passes from the heat exhausting parts 7b, 8b, 9b, 10b, 11b through the flat hollow tubes 5 to the heat absorbing parts 7a, 8a, 9.
a, 10a, and 11a toward the liquid reservoir. Such heat pipes 7, 8, 9, 10,
By repeating the phase change of the working fluid in the closed casing 21, the heated air inside the sealed casing 21 is cooled down to a predetermined temperature or lower.

As explained above, according to this embodiment, the heat absorption parts 7a, 8a, 9a, 10a, which are made of flat porous tubes,
11a and heat exhaust parts 7b, 8b, 9b, 10b, 11
Since heat pipes 7, 8, 9, 10, and 11 connected to b via the flat hollow part 5 are used,
With a simple structure, it is possible to create a thin heat exchanger for sealed enclosures with thermal efficiency approximately 10% higher than conventional ones, and it is also easy to install in sealed enclosures.

Furthermore, since air flows inside the heat absorption chamber 4 and the heat exhaust chamber 6 in a U-shape when viewed from the side, a sufficient air volume for heat exchange can be obtained even with a small blower, and thermal efficiency is also improved.

Furthermore, heat absorption parts 7a, 8a, 9a, 10a, 1
1a and heat exhaust parts 7b, 8b, 9b, 10b, 11b
Since they are connected apart in the flat direction on the flat hollow tube 5, a large space can be secured inside the heat absorption chamber 4 and the heat exhaust chamber 6, so that the air flow path can be adapted to various design specifications. This makes it possible to increase the degree of freedom in designing the heat exchanger.

In addition, heat absorption parts 7a, 8a, 9a, 10a, 11
a and heat exhaust parts 7b, 8b, 9b, 10b, 11
b and the flat hollow tube 5 are joined by brazing, so the sealed casing 2 can be sealed without applying a sealant or the like.
1. External moisture, oil mist, etc. can be prevented from passing through the heat exchanger 1 for a sealed casing and entering the inside of the sealed casing 21.

Furthermore, heat pipes 7, 8, 9, 10, 1
1. Since the joints of the header pipes 15 and 16 and the corrugated fin 12 are connected by brazing,
In addition to improving the heat transfer coefficient, it can be assembled by simple brazing work, so manufacturing costs can be reduced by reducing assembly man-hours.

Furthermore, since the liquid level of the working fluid in the heat pipes 7, 8, 9, 10, and 11 is set to be the same inside the header pipe 15, so-called gory out occurs in a particular heat pipe made of a flat porous pipe. It is possible to prevent this phenomenon from occurring and to make the heat transfer performance of each tube in the flat porous tube uniform.

Although the corrugated fins 12 are used in this embodiment, for example, cut-and-raised fins may be used.

Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments in any way, and it goes without saying that it can be implemented in various forms without departing from the gist of the present invention. .

Effects of the Invention As detailed above, the heat exchanger for a closed casing of the present invention uses a heat pipe formed by connecting a heat absorption part and a heat exhaust part made of flat porous tubes through a flat hollow tube. This makes it possible to reduce the size of the heat exchanger by reducing the volume of the heat pipe section that performs heat exchange and increasing the degree of freedom in setting the positional relationship between the heat absorption part and the heat exhaust part. This has the excellent effect of realizing a heat exchanger with high thermal efficiency and a high degree of freedom in design.

Furthermore, since it is only necessary to connect the flat porous tubes and the flat hollow tubes, the structure of the heat exchanger is simplified.

Furthermore, since the air is circulated along the flat porous tube, pressure loss during air circulation is reduced, and a sufficient amount of air can be supplied for heat exchange using a small blower.

Furthermore, since the heat absorption chamber and the heat exhaustion chamber are isolated by the flat hollow tube, a dedicated partition member is not required, and the number of parts and assembly man-hours can be reduced.

[Brief explanation of the drawing]

Fig. 1 is a front view of the embodiment of the present invention, Fig. 2 is a right side view thereof, Fig. 3 is a cross-sectional view of the heat absorbing section constituting the heat pipe, and Fig. 4 is a cross-sectional view of the heat absorbing section of the heat pipe. FIG. 5 is a longitudinal sectional view of the vicinity of the flat hollow tube. 1... Heat exchanger for sealed casing, 4... Endothermic chamber, 5
...Flat hollow tube, 6...Exhaust heat chamber, 7a, 8a, 9
a, 10a, 11a...endothermic part, 7b, 8b, 9
b, 10b, 11b...exhaust heat section, 7, 8, 9, 1
0, 11...Heat pipe, 12...Corrugated fin, 13...Blower for heat absorption, 14...Blower for exhaust heat.

Claims (1)

[Scope of Claim for Utility Model Registration] A heat exchanger for a sealed casing that is installed on the side wall of a sealed casing and performs heat exchange between the inside of the sealed casing and the outside, which communicates with the inside of the sealed casing. a heat absorption chamber that is isolated from the heat absorption chamber by a sealed flat hollow tube and is open to the outside of the sealed casing; A heat absorbing section that absorbs heat inside the heat absorption chamber and a sealed flat hollow tube that are connected to each other at one end and communicated with the flat hollow tube at the other end. Each hole of the porous tube is connected at one end to the flat hollow tube at a position away from the heat absorption part connection position of the flat hollow tube at least in the flat direction, and the a flat heat pipe formed from a heat exhaust section that exhausts heat inside the heat chamber; fins disposed on the heat pipe; a heat-absorbing blower that circulates air inside the sealed casing along the flat direction of the heat-absorbing part of the flat heat pipe; A heat exchanger for a closed casing, comprising: an exhaust heat blower that circulates air outside the body along the flat direction of the exhaust heat section of the flat heat pipe.