JPH0539660Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention is an improvement of a heat exchanger suitable for use in cooling the temperature inside a housing having a heat generating part in various electronic devices, devices, etc. Regarding.

[Conventional technology]

In the case of various electronic devices and devices that are made up of printed circuit boards with a large number of electronic components mounted on them, power supplies, etc., the amount of internal heat generated by energization is large, and the rise in temperature inside the housing may have a thermal effect on the electronic components. In order to prevent this, 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 necessary to use a filter or the like to prevent the entry of dust and the like, and furthermore, this creates a problem in 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, for this type of electronic equipment and devices, in order to maintain the performance of internal electronic components, etc., it is necessary to prevent dust, moisture, etc. from entering the housing as much as possible.

For this reason, in this type of electronic equipment and devices,
A heat exchanger unit for heat dissipation that cools the inside of the housing by installing a heat exchanger element that alternately forms passage grooves for circulating air inside the housing and outside air and exchanging heat between these passage grooves, thereby cooling the inside of the housing. It is attached to a part of the housing (for example, the side wall or ceiling), partitions each passage groove, and communicates between the inside of the housing and the outside of the housing, thereby preventing dust, moisture, etc. from entering the housing. Many methods have been proposed to date. Most commonly, such conventional heat exchangers are formed by sequentially bending plates so that the groove width is thin and the groove depth is deep, so that the cross section is approximately U-shaped. A structure in which the grooves are formed alternately is known, but it is not only difficult and complicated to process, but also tends to cause turbulence at the inlet and outlet portions of each passage groove, impeding the inflow and outflow of airflow. The drawback was that the flow rate became smaller and the heat exchange efficiency decreased. This is because when feeding each fluid in the flow direction of the passage groove at the inlet and outlet of each passage groove, there is a wall part forming the other groove in the adjacent part perpendicular to this feeding direction, and this This was due to airflow colliding and creating turbulence. Furthermore, in the conventional structure described above, it is necessary to bend the air flow in each narrow groove due to the positional relationship between the inlet and outlet of each passage groove, making it difficult to obtain a smooth flow. Furthermore, air pockets and turbulence are likely to occur within each groove, resulting in a decrease in heat exchange efficiency.

For this reason, the present applicant, for example,
According to Publication No. 71875, the side edge portions of both ends are bent in opposite directions, and a portion of the side edge portions of the side portions adjacent to the side edge portions of both ends are bent. A plurality of rectangular flat plate pieces formed by bending in the opposite direction to the bending direction are alternately combined in opposite directions, and the tips of the side edge portions bent in the combined direction are aligned. A heat exchanger unit has previously been proposed that has elements that are joined to each other and stacked at predetermined intervals to alternately form passage grooves through which different fluids flow.
According to such a structure, each part can be easily processed and assembled, and the opening area at the entrance and exit of each passage groove can be reduced by joining the side edge parts of the plate pieces forming the other passage groove. By closing, it was possible to form the grooves so that they were wider than the width of the grooves, allowing air to flow smoothly into and out of each passage groove, thereby improving heat exchange efficiency.

[The problem that the idea aims to solve]

However, according to such a conventional heat exchanger unit, it is unavoidable that the air flow bends inside the element due to the positional relationship between the inlet and outlet of the two types of passage grooves, and as a result, the passage This causes air pockets or turbulence in the grooves, causing problems in terms of heat exchange efficiency. Due to the outflow structure, etc., the overall size of the heat exchanger tends to increase, which is a problem. In other words, in this type of heat exchanger unit, the heat exchange efficiency by the element is proportional to the product of the heat transfer area and the wind speed. In this case, 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, and the unit casing It was also expected to become larger.

On the other hand, the heat exchanger unit equipped with the above-mentioned elements is usually attached to the side wall or ceiling of the equipment housing, so it is necessary to secure internal space or increase the overall size of the housing. In order to prevent
In particular, there is a demand for miniaturization in the thickness and length directions.
It is necessary to take some measures that can satisfy such demands.

[Means to solve the problem]

In order to meet such demands, the heat exchanger according to the present invention is attached to the ceiling of a device housing containing a heat generating part, and is designed to cool the air inside the housing by heat exchange with outside air. a heat transfer plate body forming a recessed space inside by a slope portion inclined on one side; and a heat transfer plate body disposed facing at least an outer surface of the heat transfer plate body at a predetermined interval to form a fluid passage. The heat transfer plate also includes an outer cover body in which an opening for feeding outside air is formed in a portion facing the top of the heat transfer plate body, and an outside air feeding fan attached to send outside air into the passage from the opening of the outer cover body. The outside air sent to the top side of the heat transfer plate body by this fan is caused to flow along the slope of the heat transfer plate body in the passage, and is thereby combined with the air inside the housing flowing along the inner surface of the heat transfer plate body. It is designed to perform heat exchange.

[Effect]

According to the present invention, the air inside the housing and the outside air are made to flow from the center to the periphery along the slopes formed by curved surfaces etc. on the inner and outer sides of the heat transfer plate body. The fluid flows appropriately and smoothly along the surface of the heat transfer plate body, thereby increasing the contact area of each fluid to the inner and outer surfaces of the heat transfer plate body and improving heat exchange efficiency.

〔Example〕

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

FIG. 1 shows an embodiment of the heat exchanger according to the present invention. In the figure, the heat exchanger, which is designated as a whole by the reference numeral 10, is an electronic device that generates high temperature, high heat, etc., and increases the temperature inside the housing. In the case 1 of various electronic devices, devices, etc., which has a heat generating part 2 installed therein, the case 1 is attached so as to cover the heat exchanger mounting opening 1b in the ceiling part 1a, and converts the air inside the case a into the outside air b.
The case where it is used for heat dissipation cooling will be explained. Note that the flow of the air inside the housing a and the outside air b is indicated by arrows in the figure.

First, the schematic structure of the heat exchanger element 11 of the heat exchanger generally designated by the reference numeral 10 will be explained using FIGS. 1, 2a, and 3a and 3b. is equipped with a heat transfer plate body 12 formed from a thin plate material so as to have a generally arm-shaped bulge portion having a hemispherical surface or the like as a whole, and the inner and outer surfaces of the heat transfer plate body 12 are formed by a spherical (or curved) surface. It is composed of a heat exchange section 12a formed therein and an attachment flange 12b formed at the base of the heat exchange section 12a and fixed to the housing 1 side or the like. Note that the shape of the heat transfer plate body 12 as the element 11 is, for example, a truncated cone shape or a truncated pyramid shape consisting of a top part and a slope part inclined from the periphery, as shown in FIG. 2b or c. Of course, it may also be one that exhibits a shape.

According to the heat transfer plate body 12 constituting such an entrainment 11, FIGS.
As shown in Figure 2, by introducing two different types of fluids (air inside the housing or outside air) into the center of the inner and outer surfaces, and flowing them from the center to the periphery along each curved surface (slanted part), Each flow can be made to be an appropriate and smooth flow along the surface of the heat transfer plate body 12 without causing turbulence, and as a result, among the heat transfer plate bodies 12,
The contact area of each fluid to the outer surface side can be increased, and heat exchange efficiency can be improved. Note that reference numerals 13 and 14 in FIGS. 3A and 3B indicate fluid feeding fans that feed fluid toward the top of the curved surface of the heat transfer plate body 12, respectively.

Here, according to the heat transfer plate body 12 having the above-mentioned curved surface shape, by blowing and feeding the fluid as described above, the fluid flows smoothly along each curved surface from the top to the peripheral edge. For example, when a fan is used to spray fluid onto a flat plate-shaped member from a perpendicular direction, the fluid that hits the flat part becomes turbulent at that part, making it impossible to obtain fluid flow in the plane direction. The advantage is obvious compared to the case where the heat exchange efficiency deteriorates.

Heat exchanger element 1 with such a configuration
1 is the ceiling portion 1a of the housing 1, as shown in FIG.
The opening 1b is bulged outward and installed and fixed in a state where the opening 1b is closed.
and external air b is blown to the outside to perform heat exchange between them. Here, 2 in the figure
Reference numeral 0 denotes an outer cover body formed in approximately the same shape as the heat transfer plate body 12 described above and assembled to the outside of the heat transfer plate body 12 at a predetermined distance, and has an outside air feeding fan 14 on the top thereof. The blow-in port 20a is bored, and an outside air circulation passage 21 is formed between the blow-in port 20a and the curved surface of the heat transfer plate body 12. On the other hand, inside the heat transfer plate body 12, there is an air inlet 2 having a substantially similar shape.
2a, to which a fan 13 is attached, and which forms a circulation passage 23 for air within the housing.
2 is assembled in the same way.

The outer cover body 20 and the inner cover body 22 are designed to appropriately and reliably circulate the outside air and the air inside the housing along the outer and inner surfaces of the heat transfer plate body 12, thereby exchanging heat between them. This is something that can be effective in getting people to do it. In addition, the above-mentioned example shows a case where the fans 13 and 14 are attached to blow the air inside the housing and the outside air to the heat transfer plate body 12 side to increase the heat exchange efficiency, and the flow of the fluid is optimized. Although it is effective to do so, it is not necessarily necessary, and a modification as shown in FIG. 4 may also be considered. That is, the high temperature air inside the housing 1 rises to the housing ceiling 1a,
It enters the hemispherical recessed space, flows from the air inlet 22a at the top of the inner cover body 22 along the inner passage 23, and is cooled by heat exchange with the outside air along the way, so it naturally flows along the curved surface. It is self-evident that the air flows downward by convection, and its advantages are obvious. It will be easily understood that such a phenomenon occurs in substantially the same way even if the inner cover body 22 is omitted, depending on the temperature conditions and the like.

Moreover, even if it is outside the heat transfer plate body 12,
By omitting the outer cover body 20 and blowing outside air, the warmed air gradually rises.
Although natural convection is generated and a certain amount of heat exchange can be performed, in order to direct the lowest temperature outside air to the top of the heat transfer plate body 12, which is in contact with the high temperature air inside the housing, it is necessary to It is desirable to use a cover body 20 and a fan 14 as shown in FIG.

Here, the heat transfer plate body 12, cover bodies 20, 22, etc. having a hemispherical shape as described above can be easily formed by simple press processing, etc., but of course, they can also be formed integrally with a resin material etc. be. Incidentally, reference numerals 25 and 25 in FIG. 1 are coupling means having spacers for assembling the heat transfer plate body 12 and the cover bodies 20 and 22 integrally and separated by a predetermined distance.

In such a configuration, by flowing the air inside the housing and the outside air along the slopes formed by the curved surfaces inside and outside of the heat transfer plate body 12 that constitutes the heat exchanger element 11, the air flows to the inside and outside sides. The contact area of each fluid can be increased, and unlike the conventional method, turbulence and air pockets do not occur, and the heat exchange efficiency can be greatly improved compared to the conventional method. Furthermore, according to the structure of the heat exchanger 10, the entire structure is simple and has excellent processing and assemblability, and the entire structure can be easily constructed with the minimum required thickness, making it small and compact. There are also advantages such as being able to

Note that the present invention is not limited to the structure of the embodiments described above, and the shape and structure of each part of the heat exchanger 10 and the heat exchanger element 11 can be modified and changed as appropriate, and the applicable equipment and apparatus can be Also, its applications can be considered in various fields. For example, in the embodiment described above, the heat exchanger 10
Although the case has been described in which the heat exchanger element 11 is attached to the housing 1 with the heat exchanger element 11 bulging outward,
If a fan or the like is attached to properly spray the fluid, it may be installed in a state in which it bulges inward, and the effect will be obvious.

Furthermore, as the material for the heat exchanger element 11 and the cover bodies 20, 22, it is preferable to use metal materials such as copper and aluminum, which have excellent heat transfer coefficients. The material may be used to form the material, and various modifications can be considered as the molding method.

[Effect of idea]

As explained above, according to the heat exchanger according to the present invention, the heat exchanger is attached to the ceiling of the equipment housing containing the heat generating part, and is designed to cool the air inside the housing by heat exchange with outside air. A heat transfer plate body forming a recessed space inside by a slope portion inclined to the side; an outer cover body in which an opening for feeding outside air is formed in opposing parts;
An outside air feeding fan is attached to send outside air into the passage from the opening, and the outside air sent to the top side of the heat transfer plate body by the fan is applied to the slope of the heat transfer plate body within the passage. By flowing along the inner surface of the heat transfer plate body, heat exchange is performed with the air inside the housing that flows along the inner surface of the heat transfer plate. Despite its simple and inexpensive configuration, it is possible to exchange heat between the air inside the housing and the outside air. , inside the heat transfer plate,
It is possible to create an appropriate and smooth flow along the slope due to the external curved surface, etc., thereby increasing the contact area of each fluid to the inner and outer surfaces of the heat transfer plate, and also eliminating turbulent flow as in the conventional case. It does not create air pockets or air pockets, greatly improving heat exchange efficiency compared to conventional methods, and it can be easily constructed with the minimum required thickness, making the entire heat exchanger smaller and more compact. It has various excellent effects. especially,
According to the present invention, it is possible to obtain the flow of air inside the housing and outside air along the surface of the heat transfer plate body by natural convection based on the temperature, etc., and the advantage is that it is excellent in terms of heat exchange efficiency. play.

[Brief explanation of the drawing]

FIG. 1 is a schematic sectional view of the main structure of an embodiment of a heat exchanger according to the present invention, FIGS. 2a, b, and c are schematic perspective views illustrating heat exchanger elements, and FIG.
Figures a and b are schematic illustrations showing the flow of the fluid, and Figure 4 is a schematic sectional view showing another embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Equipment housing, 1a... Ceiling part, 1b... Heat exchanger installation opening, 2... Heat generating part, 10... Heat exchanger, 11... Element for heat exchanger, 12...
Heat transfer plate body, 12a... Heat exchange section, 12b...
...Mounting flange, 13, 14...Fluid feeding fan, 20...Outer cover body, 20a...
Fluid inlet, 21...Fluid passage, 22...Inner cover body, 22a...Fluid inlet, 23...Fluid passage.

Claims (1)

[Scope of utility model registration request] A heat exchanger that is attached to the ceiling of a device housing that has a built-in heat generating part and cools the air inside the housing by exchanging heat with outside air. A heat transfer plate body forming a recessed space in the heat transfer plate body, and a portion facing the top of the heat transfer plate body disposed oppositely at a predetermined interval on at least an outer surface of the heat transfer plate body and forming a fluid passage. It comprises an outer cover body in which an opening for feeding outside air is formed, and a fan for feeding outside air attached so as to send outside air into the passage from the opening of the outer cover body,
The outside air sent to the top side of the heat transfer plate body by this fan flows along the slope of the heat transfer plate body in the passage, and exchanges heat with the air inside the housing flowing along the inner surface of the heat transfer plate body. A heat exchanger characterized by performing the following.