JPH02279992A - Heat exchanger element - Google Patents

Abstract

PURPOSE:To reduce the thickness and the lengthwise size of a heat exchanger by putting together in a multilayer combination a plurality of substantially rectangular plates, of which adjoining bordering parts are bent oppositely to each other, in such a manner as to alternately combine two oppositely facing plates so as to pass different fluids with one flow across the other flow. CONSTITUTION:The adjoining bordering parts 7a, 7b : 7c, 7d of each of substantially rectangular flat plates 7 are bent substantially all along the borders in opposite directions between any two adjoining bordering pats; the opposite bordering parts 7a, 7c : 7b, 7d are bent in the same direction. A plurality of such plates 7 are put together in an interspaced multilayer combination with two oppositely facing polates alternately combined and by joining the edge portions of the bordering parts bent toward each other so that across from two adjoining bordering parts 7a, 7b to respectively opposite bordering parts 7c, 7d grooves 5, 6 constituting two different passages allowing differing fluids to pass, one flow across the other in direction, are alternately formed. As a result, air is prevented from staying stagnant, the heat exchange efficiency is considerably improved, and the element 4 can be made smaller and compact in structure.

Description

[Detailed Description of the Invention] [Field of Application in Industry-1-] The present invention provides a heat exchanger element suitable for use in a heat exchanger for cooling the temperature inside a housing of, for example, electronic equipment, devices, etc. Regarding improvements.

[Conventional technology]

Various electronic devices and devices that have a group of printed circuit boards mounted with a large number of electronic components, a built-in power supply, etc. have a large amount of internal heat generated due to the temperature increase within the housing. In order to prevent thermal effects on parts and the like, it is necessary to provide some kind of cooling means. The most common type of cooling method is a forced air cooling system, which uses a fan or the like to forcefully supply outside air into the housing, and then circulates the air inside the housing before exhausting it. It is important to prevent dust and the like from entering the filter by using a filter, and furthermore, the problem arises that maintenance and inspection work must be performed frequently due to clogging of the filter. Moreover, such a filter not only lacks reliability in terms of filtration performance, but also has the disadvantage that it is completely defenseless against moisture and the like. In particular, this kind of electronic equipment,
In order to maintain the performance of internal electronic components, etc., devices must be protected from dust, moisture, etc., to the extent possible.
- Must be.

For this reason, in this type of electronic equipment and equipment, the passage grooves that allow air inside the housing to communicate with outside air must be crossed. It has been considered to install a heat exchanger in a part of the housing for cooling the inside of the housing by exchanging heat between these passage grooves. According to such a heat exchanger, it is possible to prevent the intrusion of dust, moisture, etc. into the housing by partitioning each passage groove, and a number of heat exchangers with various configurations have been proposed in the past. has been done. The most common type of conventional heat exchanger is one that has a roughly U-shaped cross section (by sequentially bending plates in a detour to form inner and outer passage grooves alternately). Although it is known,
Not only is the machining troublesome and complicated, but turbulence tends to occur at the entrance and exit of each passage groove, and the inflow and outflow of air is obstructed, reducing the flow rate and reducing heat exchange efficiency. There was a drawback.This is because at the exit of each passage groove, there is a wall forming the other groove in the adjacent part, and the air flow collides with this, causing turbulence b:
It can be easily understood from the fact that t. Furthermore, in the conventional structure described above, due to the positional relationship of the entrance and exit of each passage groove, the air flow in each premises cannot be smoothly flowed due to the bending part 41. This tends to result in lower heat exchange efficiency.

For this reason, Mizude-jin, for example,
According to the above publication, the side edge portions of both ends are bent in parallel directions, and a portion of the side edge portions of the side portions adjacent to the side edge portions of both ends are bent, respectively. A plurality of rectangular flat plate pieces formed by bending in the opposite direction to the bending direction are assembled in opposite directions at the intersection 17', and the tip of the side edge portion is bent in the direction of the combination. This is a heat exchanger element in which the elements are stacked at a predetermined interval so as to be joined to each other to form passage grooves in which different thorns flow at intersections 71-. I am proposing it first.

According to such a structure, each part can be easily processed and assembled, and the opening area at the entrance IS and exit "S" of each passage groove can be made similar to the side edge portions of the plate pieces forming the other passage groove. By joining and closing the passages, it is possible to form them so that they are wider than the groove width, allowing air to flow smoothly into and out of each passage groove, improving heat exchange efficiency.]
- It was possible to do so.

[Problem to be solved by the invention]

However, according to such conventional heat exchangers,
Due to the positional relationship between the inlets and outlets of the six types of passage grooves, it is unavoidable that the air flow bends inside the element, resulting in air pockets or turbulent flow within the passage grooves. This poses a problem in terms of heat exchange efficiency, and furthermore, the overall size of the heat exchanger including the element tends to increase. In other words, in this type of heat exchanger, the heat exchange efficiency by the element is proportional to the product of the heat transfer area and the wind speed.However, in the conventional element structure, the overall size and compactness can be made smaller, and the heat transfer area can be reduced. In order to increase the size, it is necessary to narrow the width of the inner and outer passage grooves to increase the total number of grooves, and at the same time increase the passage length.As a result, the thickness and length of the element must be increased. It was a must-have.

On the other hand, heat exchangers equipped with this type of element are usually attached to the side walls or inside walls of the equipment housing, so it is necessary to secure internal space or to cover the entire housing. In order to prevent the increase in size, there is a need to make the whole device smaller and more compact, especially to make it thinner and smaller in the thickness and length directions, and it is necessary to take some measures that can satisfy these demands. .

[Means to solve the problem]

In order to meet such demands, the heat exchanger element according to the present invention has a plurality of flat plate pieces each having a generally rectangular shape and having adjacent side edge portions bent in opposite directions. These plate pieces are alternately combined in opposite directions and stacked at a predetermined interval with the tips of the side edge portions bent in the combination direction joined to each other. Two types of passage grooves are alternately formed to allow fluid to pass from adjacent side edge portions to opposing side edge portions in a crossed manner.

[Effect]

According to the present invention, a plurality of rectangular flat plate pieces formed by bending adjacent side edge portions in opposite directions are combined in opposite directions in an intersection Q-, and the bent side By stacking the edge portions at a predetermined interval with the tips 1- of the edge portions connected to the intersection Lf, different fluids can flow from each side edge portion to the opposing side edge portion in a crossed state. Let's do it 1! ), it is possible to form a heat transfer plate body as a heat exchanger element in which passage grooves are formed at intersections 17-.

〔Example〕

Hereinafter, the present invention will be explained in detail using embodiments shown in the drawings.

Figures 1 to 4 show an embodiment of the heat exchanger element according to the present invention. In this embodiment, the heat exchanger element is installed in various electronic devices and devices to cool the air inside the housing with outside air. The case where it is used in a heat exchanger for heat dissipation will be explained. Also,
In this example, the arrows → and → in the figure indicate the flow of outside air, and the arrows φ and - indicate the flow of air within the beach. However, the present invention is not limited to this, and it is possible to reverse the flow of the fluid or to configure the outside air and the air inside the housing to be opposite to each other.

First, to briefly explain the general structure of the heat exchanger, which is indicated by the symbol l in FIGS. The case is shown in which it is arranged vertically on a part of the side wall of the casing 3.

A heat transfer plate body 4 as shown in FIGS. 1 to 3 is disposed in the center of the casing 2 in the longitudinal direction (upward direction in the figure) as a heat exchanger element. This heat transfer plate body 4 alternately forms inner and outer passage grooves 5 and 6 for exchanging heat between these bodies by circulating the internal air of the casing 3 and the outside air that cools it. A plurality of rectangular plates (diamond-shaped in this embodiment as shown in FIGS. 1 and 3) are used.
It is formed as a combination of 17 stacked layers.

Moreover, above the heat transfer plate body 4 in the casing 2,
An air chamber 9 is formed inside the casing 3, which opens into the casing 3 at an exhaust port 8 for air inside the casing 2, which is bored in the side facing the body 3 of the casing 2. A blowing fan 10 is provided. In this embodiment, the fan 10 is provided in the exhaust C18 portion, but the fan 10 is not limited thereto. Of course it's a good thing. This lower air chamber 9 is provided with a suction hole which is opened into the casing 3 on both sides of the casing 2, as shown in FIG. I 1
The air inside the housing introduced from 1 and 11 is guided diagonally upward along this passage and flows into the
Air is blown into the housing 3 from the air 18 by the fan 10.

On the other hand, above the heat transfer plate body 4 in the casing 2, the outside air from outside the cylinder 3 flows through the air intake port 12 formed from the lower side on the outer surface of the casing 2 to the heat transfer plate I and the heat transfer plate 4. A 1-part air chamber 13 is formed which is introduced through the outer passage groove 6, and this L-part air chamber 13 is connected to the casing by an exhaust [ ] 14 bored in the side surface of the casing 2 facing the outside of the casing 3. 3.Communicates with the outside. The exhaust port 14 is provided with an outside air blowing fan 15 for exhausting outside air that has passed through the heat transfer plate body 4 and exchanged heat with the internal air to the outside of the casing 3. Of course, like the fan 10 described above, the fan 15 may be disposed on the top end side of the heat transfer plate body 4 in an appropriate position such as horizontally. Although not shown in the drawings, it is preferable to attach a filter to the above-mentioned intake port 12 to remove dust and the like contained in the outside air.

According to this embodiment, by stacking and assembling a plurality of rectangular plate pieces 7 at predetermined intervals, different fluids (inner and outer air) are transferred from the adjacent side edge portions 7a and 7b to the respective opposite sides. A casing 2 exhibiting a rectangular parallelepiped shape in which a heat transfer plate body 4, which alternately forms two types of passage grooves 5 and 6 that allow the flow to flow in an crossed state over the side edge portions 7c and 7d, is disposed in the central portion in the longitudinal direction. As shown in FIGS. 1 and 3, inner wall portions 2a, 2 on both sides thereof
b, side edge portions 7a on both sides supporting the opposing corners 4a, 4b of the heat transfer plate body 4;

7b; It is configured to form a support portion 20.21 defining between 7c and 7d. Further, one inner wall portion 2a of the casing 2 is provided with a remaining corner portion 4c of the heat transfer plate body 4.
, 4d. [7] The first and second partition walls 22, 23 are erected to define the space between the air chambers 9, 13 on both lower end sides of the casing 2-1-1. The space between the first partition wall 22 and the support part 20 on the inner wall 2a side where this partition wall 22 is provided (an outside air intake [112 suction chamber 24), and the space between this support part 20 and the second partition wall 23 (the suction port 1 that sucks the air inside the flute body).
The internal air suction chamber 25) that communicates with the casing 2 and the outlet 8 and
4,12.11. In addition, 26 in the figure
are the corners 4a, 4b, 4c, 4d of the heat transfer plate body 4
This is a sealing material made of sponge rubber or the like for sealing the passage grooves 5 and 6 and preventing communication between the passage grooves 5 and 6.

Now, according to the present invention, the heat exchanger 1 having the above-described configuration
, the heat transfer plate body 4 as a heat exchanger element for exchanging heat between the air inside the housing and the outside air is made of a plurality of flat plate pieces having shapes as shown in FIGS. 1 to 3. It is characterized by being constructed as a laminate made of 7. That is, the plate piece 7 having a rectangular shape is a part that characterizes the present invention, and is formed as a flat plate having a substantially rectangular shape from a material with good thermal conductivity such as an iron plate, a copper plate, or an aluminum plate, and the adjacent plate piece 7 is a portion that characterizes the present invention. The side edge portions 7a, 7b; 7c, 7d are bent in opposite directions over substantially the entire area, and as a result, the opposing side edge portions 7a, 7c near b, 7d are bent in the same direction. become. As is clear from FIG. 2, these plurality of plate pieces 7 are alternately combined in opposite directions (by inverting the surfaces or rotating by 180 degrees in an intersecting V direction) and folded in the direction of the combination. The tips of the bent side edges! 7: By stacking them together at a predetermined interval, different fluids (inside and outside air) can be
Adjacent side edge portion 7a.

7b to respective opposite side edge portions 7c.

Two types of passage grooves 5 and 6 are alternately formed to allow the passage to flow in an intersecting state over 7d.

With such a configuration, inner and outer passage grooves 5 and 6 are alternately formed between each plate piece 7, and side edge portions 7a and 7b of each plate piece 7 are bent and joined.
7c and 7d are formed with a closing part that closes one of the passage grooves and an opening with an enlarged area, and this opening is formed in the inner and outer passage grooves 5 and 6 as described above. This constitutes entering and exiting. In addition, 3 in Figure 2
0 is a connecting rod (indicated by a dotted chain line in the figure) for connecting a plurality of plate pieces 7 in a stacked state, but instead of this, this joint may be welded or the like. .

In addition, each bent side edge portion 7a of the plate piece 7 described above
, 7b; 7c, and 7d are each formed by being bent in a direction perpendicular to the surface, and their tips extend in the direction of the surface, and the extending portions in the direction of the surface are joined to each other. The structure is such that the portion corresponding to the joint is closed while maintaining the distance between the inner passage grooves 5 and 6.

According to the heat transfer plate body 4 having such a configuration, each of the passage grooves 5 and 6 can be configured as a substantially linear passage from the inlet to the outlet, and the entire area of the plate piece 7 can be effectively used as a passage, which is different from the conventional one. Not only does this eliminate the occurrence of air pockets, etc., but it is also possible to configure both passage grooves 5 and 6 so that they cross each other and touch each other. The element can be constructed with a maximum thickness and passage length, and the element can be made smaller and more compact, and the overall size of the heat exchanger can also be made smaller. In particular, the miniaturization of the entire heat exchanger l is achieved by arranging the heat transfer plate body 4 that constitutes the element in the casing 2 so as to be inclined toward the center, as described above, and by arranging it in the passage grooves 5 and 6. This can be achieved more effectively by arranging the connection and arrangement of the spaces as described above.

In addition, the population and outlet of the passage groove 5 corresponding to the casing lower air chamber 9 and the internal air suction chamber 25 of 11f1, and]
One section between the inlet and outlet of the passage groove 6 facing between the two-part air chamber 13 and the outside air suction chamber 24 has a width dimension twice the groove width of each passage groove 5. While opening to the exhaust port, the other passage groove side is closed by the joining of the plate pieces 7 that form this, and this closed part is formed by the joining edge of the two plate pieces 7, 7. Since the air source is only placed directly in front of the air, there is no turbulence when the air source is introduced or exited at this point, making it possible to obtain a smooth air source. By simply laminating a large number of 11 plate-shaped plate pieces 7 by simple pressing etc., the required opening I-1 part and closing part can be formed by 41 heat transfer plate I body 4.
Not only is it easy to form and assemble, but it is also possible to form the same number of grooves as before, with a 5° passage groove that doubles the width of the opening groove. 6 can be obtained, thereby making it possible to make the airflow smooth and appropriate, greatly improving the heat transfer efficiency, and thereby also achieving miniaturization.

It should be noted that the present invention is not limited to the structure of the embodiments described above, and the shape, structure, etc. of each part can be modified and changed as appropriate.
In addition, devices and devices to which it can be applied can be considered in various fields. For example, in the embodiment described in -, the heat exchanger l
Example 1 shows the case where the is arranged vertically in the housing 3. However, the present invention is not limited to this, and modifications may be considered, such as arranging it horizontally on the rod body 311 and configuring the inlet and outlet of the inner and outer cloth airflows in reverse. In addition, 1-the casing 2 mentioned above
The direction in which the openings connecting the inner spaces 9, 13, 24, 25 to the outside may be formed may be appropriately selected depending on the installation state described above.

] - In the embodiment described, the diamond-shaped plate piece 7
Although an example is shown in which the element is configured as follows, even if the element has a rectangular shape such as a rectangular shape, the same effect as described above can be expected.

〔Effect of the invention〕

As explained above, according to the heat exchanger element according to the present invention, a plurality of pieces having a substantially rectangular shape as a whole and formed by bending adjacent side edge portions in opposite directions can be obtained by simple pressing. By stacking the flat plate pieces at predetermined intervals with the tips of the side edge portions bent in the combination direction being joined 7j to each other by combining the flat plate pieces in opposite directions alternately, Since one type of passage groove is alternately formed to allow different fluids to flow in a crossed manner from adjacent side edge portions to opposing side edge portions, the structure is simple and inexpensive. figure,
Each passage groove can be configured as a substantially straight passage from the inlet to the outlet, and moreover, almost the entire area of the plate piece can be effectively used as a passage, which not only eliminates the generation of air pockets, etc. Since the grooves can be constructed so that they overlap and touch each other in a crossing state, the heat exchange efficiency can be greatly improved compared to the conventional method, and the element can be constructed with the necessary minimum thickness and passage length. The element can be made smaller and more compact, and as a result, the entire heat exchanger can be made smaller, which has various excellent effects. In particular, miniaturization of such a heat exchanger as a whole is achieved by -1- arranging the heat transfer plate body constituting the element at an angle to the center within the casing, and reducing the space for the passage groove. This connection arrangement can be achieved more effectively by effectively utilizing the dead space formed by the chambers formed at both ends of the casing and the inclined elements. Furthermore, according to the present invention, the groove width at the inlet and outlet portions of each passage groove can be widened, so that the introduction and extraction of airflow into and out of each premises can be made smooth and appropriate, thereby increasing heat transfer efficiency. There are also other advantages.

[Brief explanation of drawings]

11% is a schematic cross-sectional view showing an embodiment of a heat exchanger to which the heat exchanger element according to the present invention is applied, and FIG. 2 is a schematic exploded perspective view of a heat transfer plate body serving as the heat exchanger element, which is characterized by the above. 3 is a schematic perspective view showing the general structure of the entire heat exchanger, and FIG. 4 is a partial cross-sectional view for explaining one fluid suction part in the heat exchanger. l...Heat exchanger, 2...Casing, 3...
・Equipment housing, 4...Heat transfer plate body (heat exchanger element), 4a, 4b; 4c, 4d...
- Corner, 5.6...Passway groove, 7...Plate piece, 7a. 7b; 7c, 7d... side edge portion, 8. L4...
Exhaust port, 9, 13...! -1 lower air chamber, 10.1
5...Fan, 11.12...Suction "1.20"
．． 21...Support part, 22.23...Partition wall, 2
2a. 23a...support end, 24.25...suction space.

Claims (1)

[Claims] It is comprised of a plurality of flat plate pieces that have a generally rectangular shape and are formed by bending adjacent side edge portions in opposite directions, and these plate pieces are alternately combined in opposite directions. By stacking the end portions of the side edge portions bent in the combination direction at a predetermined interval while joining each other, different fluids can be transferred from the adjacent side edge portions to the opposite side edges. A heat exchanger element characterized in that two types of passage grooves are alternately formed to allow the flow to flow in an intersecting state.