JPH046240Y2 - - Google Patents

Description

[Detailed description of the invention] Purpose of the invention [Industrial application field] The invention uses a so-called heat pipe formed from a flat perforated tube to cool the inside of a sealed enclosure such as a control panel. Related to a heat exchanger for a closed case.

[Prior Art] Conventionally, heat exchangers that use so-called heat pipes have been known to cool the air inside a sealed casing of various control panels, switchboards, etc. to a predetermined temperature or lower. A heat pipe is usually formed with a working fluid such as water or methyl alcohol sealed inside, and a heat absorbing section on the lower side and a heat exhausting section on the upper end. The heat absorbing part is inserted inside the sealed casing, while the heat exhausting 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 into liquid, flows down the heat pipe, and returns to the heat absorption section. By repeating such operations, the inside of the sealed casing is cooled to a predetermined temperature or lower.

For example, as mentioned above,
As shown in the "Cooling device" of Publication No. 124994, etc., a heat pipe has a structure in which an internal electric fan is arranged adjacent to the heat pipe in the heating section side, and an external electric fan is arranged next to the heat radiation section side. is proposed.

[Problems to be Solved by the Invention] However, the above-mentioned conventional technology has the following problems and is still not sufficient. That is, (1) 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. For this reason, there is a problem in that the heat exchanger becomes larger as the volume of the portion where the heat pipes are arranged increases. Furthermore, since a plurality of circular tubes are arranged in multiple stages, there is also the problem that the structure of the heat exchanger becomes complicated.

(2) Furthermore, if multiple 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 will be disturbed by the circular tubes arranged as above. . Therefore, unless measures such as increasing the air blowing capacity of the electric fan are taken, sufficient air volume for heat exchange cannot be obtained, which poses a problem in that it impedes improvement in thermal efficiency.

(3) When sealing the working fluid into the heat pipe, it is necessary to join the ends of the heat pipe, but if the heat pipe is composed of a plurality of circular tubes, there will be a large number of joints. For this reason, there was a problem that the efficiency of assembly work during manufacturing was low. Furthermore, since there are many joints, there is also the problem that the working fluid tends to leak.

The present invention was made in view of the above-mentioned problems, and aims to provide a heat exchanger for a closed casing that is small, has high thermal efficiency, is easy to manufacture, and is less likely to leak the working fluid sealed in the heat pipe. purpose.

Structure of the invention [Means for solving the problems] The present invention, which was made to solve the above problems, consists of a hermetically sealed device installed in a sealed casing, which performs heat exchange between the inside of the sealed casing and the outside. A heat exchanger for a housing, comprising: an endothermic chamber communicating with the inside of the hermetically sealed casing; and an endothermic chamber provided above the endothermic chamber, separated from the endothermic chamber by a partition member, and opened to the outside of the hermetically sealed casing. a heat exhaust chamber; a flat porous tube extending through the partition member and extending between the heat absorption chamber and the heat exhaust chamber and having a large number of holes therein; a heat pipe formed by interconnecting each hole at an end portion and a bent portion on the side of the heat absorption chamber; fins disposed on the heat pipe; , a heat absorption blower that blows the air inside the sealed casing along the flat direction of the heat absorption chamber side portion of the heat pipe; The present invention provides a heat exchanger for a closed casing, comprising: a heat exhaust blower that blows air outside the body along the flat direction of the heat exhaust chamber side portion of the heat pipe;

[Function] In the heat exchanger for a sealed casing of the present invention, an endothermic blower disposed in the heat absorption chamber or in a position close to the heat absorption chamber converts the air inside the sealed casing into a heat exchanger equipped with fins. By blowing air along the flat direction of the endothermic chamber side portion of the pipe, the working fluid sealed in the endothermic chamber side portion evaporates and rises inside the heat pipe while taking away the heat inside the sealed casing. On the other hand, a heat exhaust blower installed in or near the heat exhaust chamber blows air from outside the sealed casing along the flat direction of the heat exhaust chamber side portion of the heat pipe. , the evaporated working fluid is cooled by external air. In this way, the heat inside the sealed casing can be removed.

Here, the heat pipe made of a flat perforated pipe is installed parallel to the direction of air blowing, so the pressure loss during air circulation is reduced, making it relatively easy to secure a specified air volume. By allowing air to flow smoothly along the flat direction of the pipe, the heat exchange capacity per unit volume can be improved.

In addition, since the heat pipe is provided to pass through the partition member and extend between the heat absorption chamber and the heat exhaustion chamber, and is made of a flat perforated tube formed in a meandering shape, there are only two joints at both ends, and the manufacturing process is easy. It is possible to improve assembly work efficiency during assembly and reduce the possibility of leakage of working fluid.

Furthermore, since the holes of the flat porous tube are formed to communicate with each other at the ends and the bent portions on the endothermic chamber side, the liquid level of the working fluid stored at the ends and the bent portions on the endothermic chamber side can be adjusted. Each hole of the flat porous tube can be held at the same position, and the heat transfer performance of each hole of the flat porous tube can be made uniform, thereby stabilizing the heat exchange capacity.

Therefore, the heat exchanger for a closed casing of the present invention utilizes the structural features of flat porous tubes to achieve miniaturization, improvement of thermal efficiency, simplification of structure and manufacturing work, reduction of the possibility of leakage of working fluid, and Works to stabilize heat exchange capacity.

[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 ceiling-mounted heat exchanger for a closed case, which is the first embodiment of the present invention.
The right side views are shown in FIG. 2. Note that the scale differs for each figure.

As shown in Fig. 1, a heat exchanger 1 for a closed case
A heat absorption chamber 3 provided in the lower part of the casing 2, a heat exhaust chamber 5 provided in the upper part of the casing 2 and separated from the heat absorption chamber 3 by a partition plate 4, and an extruded flattened part formed in a meandering shape. A heat pipe 6 made of a porous pipe and provided across the heat absorption chamber 3 and the heat exhaust chamber 5 by penetrating the partition plate 4, a corrugated fin 10 disposed on the heat pipe 6, and a corrugated fin 10 disposed in the vicinity of the heat absorption chamber 3. A heat-absorbing blower 11 that is arranged to blow the air inside the sealed casing along the flat direction of the heat absorption chamber side portion of the heat pipe 6 and the heat exhaust chamber 3 are arranged in close proximity to the outside of the sealed casing. The exhaust heat blower 12 blows air along the flat direction of the heat exhaust chamber side portion of the heat pipe 6. The joint between the partition plate 4 and the heat pipe 6 and the heat pipe 6
The joints between the corrugated fins 10 and the corrugated fins 10 are each joined by a vacuum method, a fluxless brazing method, an adhesive having good heat transfer properties, or the like. In addition,
The materials of the partition plate 4, heat pipe 6, and corrugated fin 10 are all pure aluminum or aluminum alloy.

Next, the structure of the heat pipe 6 will be explained. The heat pipe 6 is formed by processing an extruded flat porous tube into a meandering shape, and has a header tube portion 13 formed at one end and a sealing portion 14 formed at the other end. The inside of the heat pipe 6 includes partition walls 31a, 31b,
7 pipes 32a, 32b, 32c, 32d, 32e, 32 by 31c, 31d, 31e, 31f
It is divided into f and 32g. The bent portion 35 of the heat pipe 6 on the side of the heat absorption chamber 3 has a communication hole 36 in its flat direction, as shown in the cross-sectional view taken along the Y-Y line in FIG. 1 of FIG. tube 32
a, 32b, 32c, 32d, 32e, 32f,
32g are in communication with each other. Note that the communication hole 36
is a drill in the flat direction of the heat pipe 6, one surface wall 6a, middle partition walls 31a, 31b, 31c, 3
1d, 31e, and 31f, and then fill the holes on one surface wall 6a with the sealing portion 37.

Further, as shown in the longitudinal cross-sectional view of FIG.
1 are connected to form a reservoir of working fluid.
An injection pipe 42 is connected to the header pipe portion 41 , and a working fluid such as Freon or alcohol is injected into the heat pipe 6 from the injection pipe 42 . After injecting the working fluid, the opening of the injection tube 42 is caulked and sealed. In addition, the heat pipe 6 and the header pipe 41
The joint parts 43 and 44 with the header pipe 41 and the joint parts 45 and 46 of the header pipe 41 are both joined by brazing. On the other hand, the sealing part 14 seals the end part 51 of the heat pipe 6 by welding, as shown in the longitudinal cross-sectional view of FIG.
1c, 31d, 31e, and 31f are removed to form a liquid reservoir 52. The heat pipe 6 configured in this way is turned upside down several times after the working fluid is injected, and the liquid level of the working fluid in the header pipe 41 at one end of the heat pipe 6 and the liquid reservoir at the other end are The liquid level of the working fluid in 52 and the liquid level of the working fluid accumulated in the bent portion 35 on the side of the heat absorption chamber 3 are maintained at approximately the same position.

Heat exchanger 1 for closed case configured as above
As shown in FIG. 2, is installed on the ceiling of the sealed casing 61 to perform heat exchange. That is, the partition plate 4 is inserted into the opening 62 provided in the ceiling of the sealed casing 61.
The heat absorption chamber 3 at the lower part is fitted, while the heat exhaust chamber 5 at the upper part of the partition plate 4 is arranged at the upper part of the sealed casing 21.
The heated air inside the sealed casing 21 is supplied to the heat absorbing blower 1.
1, the heat flows inside the heat absorption chamber 3 in the direction shown by arrow A, that is, in the flat direction of the heat pipe 6, and flows out into the sealed casing 61 again. During this time,
The heated air flows smoothly along the flat direction of the heat pipe 6, and the header pipe 41 of the heat pipe 6,
Heat is absorbed by the working fluid stored in the liquid reservoir portion 52 and the bent portion 35 on the side of the heat absorption chamber 3, and the liquid is cooled. On the other hand, the working fluid evaporates into a gas phase and rises inside the heat pipe 6. On the other hand, the external low-temperature air flows inside the heat exhaust chamber 5 in the direction shown by arrow B, that is, in the flat direction of the heat pipe 6, by the action of the exhaust heat blower 12, and is discharged to the outside again.
During this time, the low temperature air flows smoothly along the flat direction of the flat heat pipe 6.
Cools the working fluid in the gas phase rising inside. Therefore, the working fluid returns to a liquid phase by discharging heat to the low-temperature air, and flows down inside the heat pipe 6 toward the header pipe 41, the liquid reservoir 52, and the bent portion 35 on the side of the heat absorption chamber 3. By repeating the phase change of the working fluid in the heat pipe 6, the heated air inside the sealed casing 61 is cooled to a predetermined temperature or lower.

As explained above, according to the first embodiment, the heat pipe 6 formed of a flat porous tube is used and air is blown in the flat direction to reduce the pressure loss of the air and perform heat exchange. , it is possible to realize a compact heat exchanger for a closed case with a thermal efficiency that is about 10% higher even if the height is shorter than before.

Furthermore, since the height dimension is short, less installation space is required, so installation into a sealed casing is improved from the perspective of space saving.

Furthermore, since air is circulated along the flat direction of the flat heat pipe 6, the resistance force acting on the air is reduced, so even if the heat absorption blower 11 and the heat exhaust blower 12 are downsized, the air volume is sufficient for heat exchange. You can get

In addition, since the heat pipe 6 is a flat perforated tube formed in a meandering shape, the joints are in two places, the header tube section 13 and the sealing section 14, compared to a case where a plurality of circular tubes are arranged in multiple stages. And a little. Therefore, the number of assembly steps can be reduced, and manufacturing costs can also be reduced. Furthermore, since there are fewer joints, the possibility of leakage of the working fluid within the heat pipe 6 can be reduced.

After the working fluid was injected, the heat pipe 6 was shaken up and down several times to ensure that the working fluid evenly spread to the header pipe section 13, the sealing section 14, and the bent section 35 on the heat absorption chamber side. Even if it does not cross over, the internal working fluid spreads uniformly within the flat porous tube through evaporation, so the working fluid does not accumulate unevenly in, for example, the bent portion 35 on the side of one endothermic chamber.
Heat transfer performance can be made uniform within the flat porous tube. Furthermore, since each tube 32a to 32g in the flat porous tube is communicated with each other at the header pipe 13, the sealing part 14, and the bending part 35 on the side of the heat absorption chamber 3, the header pipe part 13, the sealing part 14, and the bending part The liquid level of the working fluid stored in each of the pipes 32a to 35 is
It is possible to hold the tubes at the same position every 2g, and it is possible to make the heat transfer performance uniform for each tube 32a to 32g of the flat porous tube. Therefore, the heat transfer performance within the heat pipe 6 is uniform at any position, and stable performance as a heat exchanger can be ensured.

In addition, since the pipes 32a to 32g in the flat porous tube are communicated between the header pipe part 13 and the sealing part 14, the liquid level of the working fluid stored in the header pipe part 13 and the sealing part 14, respectively. Each pipe 32a~3
It is possible to maintain the same position every 2g, and it is possible to make the heat transfer performance uniform for each of the tubes 32a to 32g in the flat porous tube. Therefore, the heat pipe 6
The heat transfer performance inside is uniform at any position, ensuring stable performance as a heat exchanger.

In addition, since the partition plate 4 and the heat pipe 6 are joined by brazing, moisture, oil mist, etc. outside the sealed casing 61 can be removed from the sealed casing heat exchanger 1 without applying a sealant or the like. can be prevented from passing through and entering the inside of the sealed casing 61.

Furthermore, since the joints of the partition plate 4, heat pipe 6, and corrugated fin 10 are connected by brazing, the heat transfer coefficient is improved, and only a simple brazing work is required, which reduces assembly man-hours. Manufacturing costs can also be reduced.

In the first embodiment, the tubes 32a to 32g in the flat porous tube are communicated at the header tube section 13, the sealing section 14, and the bending section 35 on the side of the heat absorption chamber 3. The tubes 32a to 32g may also be configured to communicate with each other at the bent portion on the side of the chamber 5, and with this configuration, the heat transfer performance of each tube 32a to 32g can be made more uniform.

In addition, in the first embodiment, the corrugated fin 10
However, for example, a cut-up fin or the like may also be used.

Next, FIG. 7 is a front view of a side wall-mounted heat exchanger for a closed case, which is a second embodiment of the present invention.
The explanation will be based on FIG. 8 which is a right side view. Note that the scale differs for each figure.

As shown in FIG. 7, a heat exchanger 10 for a closed case
1 is a casing 103 equipped with a flange 102
The heat absorption chamber 104 is provided in the lower part of the casing 103, and the heat absorption chamber 10 is provided in the upper part of the casing 103.
4 and a heat exhaust chamber 106 separated by a partition plate 105. The heat absorption chamber 104 and the heat exhaust chamber 106 are made of extruded flat porous tubes formed in a meandering shape and pass through the partition plate 105.
6, a corrugated fin 110 disposed on the heat pipe 107, a heat absorption blower 111 disposed within the heat absorption chamber 104, and a heat absorption blower 111 disposed within the heat exhaust chamber 106. It is composed of an exhaust heat blower 112.
Material of each member, joining method and heat pipe 10
The structure of 7 is the same as that of the first embodiment described above. That is, the heat pipe 107 has its header pipe portion 11
3. The tubes in the flat porous tube are connected to each other at the sealing portion 114 and the bending portion 115 on the endothermic chamber 104 side.

Heat exchanger 1 for closed case configured as above
01 is installed on the side wall of the sealed casing 121, as shown in FIG. 8, and performs heat exchange. That is, an opening 122 is provided in the side wall of the sealed casing 121 at a position facing the heat absorption chamber 104. The heated air inside the sealed casing 121 circulates inside the endothermic chamber 104 in the direction shown by arrow C through the opening 122 by the action of the endothermic blower 111, and then returns to the sealed casing 1.
21 Return to inside. During this time, the heated air flows smoothly along the flat direction of the heat absorption chamber side portion of the heat pipe 107, heat is absorbed by the working fluid stored in the heat pipe 107, and the heated air is cooled. The working fluid evaporates into a gas phase and rises inside the heat pipe 107 . On the other hand, the external low-temperature air circulates inside the heat exhaust chamber 106 in the direction shown by arrow D by the action of the exhaust heat blower 112 and is discharged to the outside again. During this time, the low temperature air flows through the flat heat pipe 1
07, the heat pipe 10
The working fluid in the gas phase rising inside the chamber 7 is cooled. Therefore, the working fluid returns to the liquid phase by exhausting heat to the low-temperature air, and the heat pipe 10
7 inside toward the liquid reservoir. By repeating the phase change of the working fluid in the heat pipe 107, the heated air inside the sealed casing 121 is cooled to a predetermined temperature or lower.

According to the second embodiment described above, the same effects as those of the first embodiment described above are achieved, and in particular, the excellent effect of realizing a thin heat exchanger with a small depth dimension as a side wall installation type is achieved. play.

Although several embodiments of the present invention have been described above, the present invention is in no way limited to these embodiments, and can be implemented in various ways without departing from the gist of the present invention. Of course.

Effects of the Invention As detailed above, according to the heat exchanger for a closed casing of the present invention, a heat pipe made of a flat perforated tube is used and heat exchange is performed by blowing air in the flat direction. This has the excellent effect of maintaining a high heat exchange capacity and making the heat pipe portion smaller.

In addition, since the air is distributed along the flat direction of the flat porous tube, the pressure loss of the circulating air is reduced, and a small blower can supply a sufficient amount of air for heat exchange, so the thermal efficiency of the heat exchanger is also improved.

Furthermore, since the heat pipe is a flat porous tube formed in a meandering shape, there are fewer joints than when a plurality of circular tubes are arranged in multiple stages. For this reason,
The number of assembly steps can be reduced, and the possibility of leakage of the working fluid within the heat pipe can be reduced.

Furthermore, since each hole of the flat porous tube communicates with each other at the end and the bent portion on the side of the heat absorption chamber, the heat transfer performance of each hole of the flat porous tube is made uniform to stabilize the heat exchange capacity. I can do it.

[Brief explanation of the drawing]

FIG. 1 is a front view of the first embodiment of the present invention, FIG. 2 is a right side view thereof, FIG. 3 is a cross-sectional view of the heat pipe taken along line X-X in FIG. 1, and FIG. Y- in Figure 1 of the heat pipe
A Y-line sectional view, FIG. 5 is a longitudinal sectional view of the header pipe portion, and FIG. 6 is a longitudinal sectional view of the sealing portion.
FIG. 7 is a front view of the second embodiment of the present invention, and FIG. 8 is a right side view thereof. 1,101...Heat exchanger for sealed casing, 3,10
4... Endothermic chamber, 4,105... Partition plate, 5,10
6...Exhaust heat chamber, 6,107...Heat pipe, 1
0,110...Colgate Finn, 11,111
...Blower for heat absorption, 12,112...Blower for exhaust heat, 35,115...Bending portion on the side of heat absorption chamber, 36...
...Communication hole.

Claims (1)

[Scope of Claim for Utility Model Registration] A heat exchanger for a sealed casing that is installed in a sealed casing and performs heat exchange between the inside of the sealed casing and the outside, the heat exchanger communicating with the inside of the sealed casing. a heat exhaust chamber provided above the heat absorption chamber and isolated from the heat absorption chamber by a partition member and opened to the outside of the sealed casing; and a heat exhaust chamber that penetrates through the partition member to connect the heat absorption chamber and the heat exhaust chamber. A flat perforated tube is formed in a serpentine shape and has a large number of holes therein, and each hole of the flat perforated tube is communicated with each other at an end and a bent portion on the side of the heat absorption chamber. The formed heat pipe, the fins disposed on the heat pipe, and the fins disposed in the heat absorption chamber or in a position close to the heat absorption chamber, which directs the air inside the sealed casing to the flat surface of the heat absorption chamber side portion of the heat pipe. a heat-absorbing blower that blows air along the heat exhaust chamber; A heat exchanger for a closed casing, comprising: an exhaust heat blower that blows air;