JPH09159381A - Heat transfer structure using heat pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a structure of improving the heat transfer efficiency of a heat pipe in the structure that the pipe of a circular section is mounted on a metal plate. SOLUTION: Flat deformed parts 17 are formed on the parts of at least both the ends of the heat pipe 2 having a circular section mounted at a metal plate 1 in contact with the plate. A groove is provided on the mounting part of at least the pipe 2, which is engaged with the groove, retained by a fitment and mounted with the pipe 2. Further, the radius of curvature of the holding part is smaller than that of the pipe 2, and fixed by the fitment made of an elastic metal material.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat transfer structure in which a heat pipe is mounted on a metal plate by a metal fitting.

[0002]

2. Description of the Related Art It is known that a heat pipe can transfer a large amount of heat by the latent heat of a working fluid, such as cooling of cables, cooling of integrated circuits for electronic devices such as computers,
It is used for cooling the rotating shafts of machine tools and preventing snow melting and freezing on road surfaces.

In order to efficiently transfer a large amount of heat with a heat pipe, it is necessary to take a large contact area and reduce thermal resistance. Conventionally, when used as an air heater, various secondary heat transfer surfaces (fins) are attached to the outside of the heat pipe to increase the contact area with the fluid. However, various secondary heat transfer surfaces (fins)
There is also a case where it is directly attached to an object without using it, and when it is directly attached to a flat plate as shown in FIG. 6, for example, the following structure is taken in order to secure a heat transfer amount.

As shown in FIG. 7, a heat pipe 2 having a circular cross section is laid on a metal plate 1 so as to extend from a heating point on the metal plate 1 to a cooling point. Both end portions of the heat pipe 2 having the circular cross section are provided with a holding portion 19 and a flat fixing portion 20 each having a circular shape according to the shape of the heat pipe having the circular cross section, as shown in FIG. 7. It is pressed onto the metal plate 1 by the support fitting 3. Then, on both sides of the heat pipe 2 of the both-sides support metal fittings 3, there are provided screws 4 penetrating the fixing portions 20 of the both-sides support metal fittings 3. By tightening the screws 4, a circular shape is formed on the metal plate 1. The heat pipe 2 of the cross section is fixed.

A thermal grease 6 is injected into the gap between the metal plate 1 and the heat pipe 2 having a circular cross section in order to increase the heat transfer area.

Further, as the metal fitting for fixing the heat pipe 2 having the circular cross section, as shown in FIG. 8, the one side support metal fitting 5 having the holding portion 21 and the fixing portion 22 for supporting only one side by the screw 7 is used. However, in this type of metal fitting, the holding force of the hold portion 21 is weak, and a gap 8 may be formed between the portion where the heat pipe 2 having a circular cross section and the one-sided support metal fitting 5 are in contact with each other. Has been injected.

[0007]

In a structure in which a heat pipe having a circular cross section is mounted on a metal plate to transfer heat, since the heat pipe has a circular cross section, the metal plate plane and the heat pipe have a heat pipe length. The number of parts that come into line contact in the direction and are in direct contact is small. For this reason, the heat transfer efficiency has deteriorated.

In order to solve the above problem, conventionally, a structure has been adopted in which thermal grease is injected into the gap between the metal plate and the heat pipe to increase the heat transfer area.

Further, when the one-sided support metal fitting is used, the holding force of the heat pipe is weak, the heat pipe cannot be sufficiently fixed, and a gap is formed between the heat pipe and the metal fitting, and at that portion. The heat transfer resistance of
It was difficult to transfer heat through the metal fittings.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a heat transfer structure using a heat pipe having excellent heat transfer efficiency.

[0011]

In order to achieve the above-mentioned object, the invention of claim 1 provides a metal plate,
In a heat transfer structure using a heat pipe in which a heat pipe having a circular cross section is fixed by metal fittings, a portion of the heat pipe where heat is to be exchanged with the metal plate is deformed into a flat surface and is in surface contact with the metal plate. It is characterized by that.

According to a second aspect of the present invention, in a heat transfer structure using a heat pipe in which a heat pipe having a circular cross section is fixed on a metal plate by a metal fitting, the heat transfer structure is provided at a portion of the metal plate where heat is to be exchanged with the heat pipe. A groove that fits the shape of the heat pipe is provided, and the heat pipe is fixed by fitting the heat pipe into the groove and pressing it with a metal fitting.

According to a third aspect of the present invention, the radius of curvature of the portion of the metal fitting that contacts the heat pipe and presses the heat pipe is smaller than the radius of curvature of the heat pipe, and is made of an elastic metal material. It is characterized by being formed.

In the heat transfer structure using the heat pipe according to the first and second aspects of the present invention, since the portion where the metal plate and the heat pipe directly contact each other is a surface contact, the contact thermal resistance is reduced, and the contact is reduced. The heat is sufficiently transferred and received.

Further, according to the invention of claim 3, the heat pipe is securely fixed, and the metal fitting and the heat pipe are brought into close contact with each other without forming a gap, so that heat can be sufficiently transferred through the metal fitting. Be seen.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, a heat pipe 2 having a circular cross section is laid on a metal plate 1 so as to reach a range where heat transfer of the metal plate 1 is performed. As shown in FIGS. 1 and 2, a flat deformation portion 17, that is, a heat transfer surface is formed at both ends of the heat pipe 2, and the metal plate 1 and the flat deformation portion 17 are formed by the flat deformation portion 17. In direct contact. In this embodiment, the plane deforming portion 17 is formed by heating both end portions of the heat pipe 2, attaching a crawling metal fitting on the metal plate 1, and crushing and deforming the metal fitting by pressing force of the metal fitting.

As the metal fitting, for example, a both-end support metal fitting 1 fixed on both sides with a heat pipe 2 as shown in FIG.
1 is used. This both-ends support metal fitting 11 is in a circular shape so as to be curved and adhered to the heat pipe 2 in a cross-sectional shape, and both ends of the hold portion 9 are adhered to the metal plate 1. As described above, the fixing portion 10 has a planar shape.

The fixed portion 10 of the both-ends support fitting 11 has a
Screws 12 for fixing the heat pipe 2 having the circular cross section through the fixing portion 10 and fixing the metal plate 1 are attached to the front and rear pair, that is, at four positions in the length direction.

Further, the both-end support fitting 11 is entirely made of an elastic metal material, and the heat pipe 2
The radius of curvature of the holding portion 9 having the cross-sectional shape is slightly smaller than the radius of curvature of the outer surface of the heat pipe 2, so that the holding force of the heat pipe 2 is improved.

Then, by tightening the screws 12 of the both-end support fitting 11, the heat pipe 2 having the circular cross section is crushed and deformed by the both-end support fitting 11 and fixed to the metal plate 1.

Therefore, in this embodiment, since the plane deforming portions 17 are formed at least at both end portions of the heat pipe 2, the structure in which the area where the heat pipe 2 directly contacts the metal plate 1 is increased and the contact is made. The thermal resistance is reduced and the heat transfer coefficient of the heat pipe 2 is improved.

In the above embodiment, the plane deforming portion 17
In forming the, it is made by crushing and deforming by tightening with both end support fittings 11. However, the present invention is not limited to this, and crushing, cutting, grinding, etc. before mounting on the metal plate 1. You may form by the method of.

Further, in the above embodiment, the double-sided support metal fittings 11 fixed on both sides sandwiching the heat pipe 2 having the circular cross section are used, but instead of this, one side fixed as shown in FIG. 3 is fixed. Support The support metal fitting 13 can also be used. This one-sided support fitting 13 is the heat pipe 2
A holding portion 15 which is curved so as to be in close contact with the cross-sectional shape of the holding portion 15 and which has a circular shape, and a fixing portion 16 which has a flat shape so as to be in close contact with the metal plate 1 at one end of the holding portion 15. It is composed of. The fixing portion 16 of the one-sided support fitting 13 is provided with two screws 14 penetrating the fixing portion 16 and at two positions in the length direction of the heat pipe 2. That is, the heat pipe 2 is fixed by tightening the two screws 14.

Further, also in the case of the one-sided support metal fitting, it is preferable to use the metal fitting which is formed of an elastic metal material in which the radius of curvature of the heat pipe-shaped hold portion is slightly reduced like the both-sided support metal fitting. For example, as shown in FIG. 4A, a holding portion 24 having a circular shape curved in accordance with the cross-sectional shape of the heat pipe 2 and having a radius of curvature slightly smaller than the radius of curvature of the heat pipe 2, A one-sided support metal fitting 25, which is composed of a fixed portion 23 which is flat in conformity with the metal plate 1, is used at one end of the hold portion 24. As an example thereof, the radius of curvature near the fixed portion 23 in the figure is set to r ₁ = 1.5, and the radius of curvature near the tip of the hold portion 24 is set to r ₂ = 1.4.
The heat pipe 2 is fixed on the metal plate 1 as shown in (b).

The holding portion 2 of the one-sided support fitting 25
The location where the radius of curvature of 4 is changed may be the whole or another location, as long as the heat pipe 2 can be sufficiently held and brought into close contact.

Therefore, even when the one-sided support metal fitting is used, the heat pipe 2 and the one-sided support metal fitting 25 are brought into close contact with each other without creating a gap, so that the heat transfer efficiency through the one-sided support metal fitting 25 is improved. Has been done.

FIG. 5 shows another structure in which the contact area between the heat pipe 2 and the metal plate 1 is increased as in the above embodiment. Both ends of the heat pipe 2 having a circular cross section are in contact with the metal plate 1 and are fixed by both end support fittings 11.
The metal plate 1 is provided with a groove 18 in the shape of the heat pipe 2 at a position where the both end support fittings 11 are fixed. The tip of the heat pipe 2 is fitted in the groove 18 and is in close contact with the groove 18 of the metal plate 1 by the pressing force of the both-ends support fittings 11. Then, the heat pipe 2 having the circular cross section is attached to the metal plate 1 by fixing the both end support fittings 11.

In this structure, as in the embodiment in which the plane deforming portion 17 is formed, the two end portions of the heat pipe 2 are not in line contact as in the conventional case but in surface contact, so that the metal plate 1 and The area of direct contact is increased and the contact thermal resistance is reduced, and the contact surface transfers and receives heat more than before, and the heat transfer coefficient of the heat pipe 2 is improved.

Also in this structure, the metal fittings are attached and fixed, but like the embodiment in which the plane deforming portion 17 is formed, the radius of curvature of the heat pipe-shaped hold portion is slightly reduced and the elasticity is reduced. It is preferable to use a metal fitting formed of a certain metal material.

It should be noted that sufficient thermal transfer efficiency can be obtained even when the thermal grease 6 is not inserted in the gap between the metal plate 1 and the heat pipe 2, but the thermal grease 6 may be used.

The metal plate 1 used here is generally made of, for example, aluminum or copper, but the kind thereof is not particularly limited as long as it can transfer heat.

Furthermore, it is preferable that the metal fitting used in the present invention is made of a metal material obtained by subjecting an elastic phosphor bronze plate to nickel plating.

[0033]

As described above, according to the invention of claim 1, in a heat transfer structure in which a heat pipe having a circular cross section is fixed to a metal member on a metal plate, heat is transferred to and from the metal plate of the heat pipe. Since the power point is deformed into a flat surface and comes into surface contact with the metal plate, the structure in which the portion directly contacting the heat pipe is increased, the contact thermal resistance is reduced and the heat transfer efficiency of the heat pipe is improved.

Further, according to the invention of claim 2, a heat pipe-shaped groove is provided at a portion of the metal plate where heat is to be exchanged with the heat pipe, and the heat pipe is fitted into the groove and pressed by a metal fitting. Attach the heat pipe and fix it. Therefore, since the heat pipe and the metal plate are fixed so that the directly contacting portion is not a line contact but a surface contact, the contact area is increased as compared with the conventional case, the heat transfer is improved, and the contact thermal resistance is increased. Is reduced and the heat transfer efficiency of the heat pipe is improved.

Further, according to the invention of claim 3, the radius of curvature of the portion of the metal fitting which is in contact with the heat pipe and presses the heat pipe is smaller than the radius of curvature of the heat pipe, and the metal has elasticity. Since the heat pipe is made of a material, the heat pipe is securely fixed, and heat is sufficiently transferred through the metal fittings, so that the heat transfer efficiency of the heat pipe is improved.

[Brief description of the drawings]

FIG. 1 is a schematic view showing a state in which a heat pipe is attached in an embodiment of the invention of claim 1.

FIG. 2 is a schematic side view of a fixing portion by the support fittings at both ends.

FIG. 3 is a schematic view showing an example in which a metal fitting for supporting one side is used.

FIG. 4 is a schematic view showing the case of using the one-sided support metal fitting of the embodiment of the invention of claim 2;

FIG. 5 is a schematic view showing a case where a groove is provided in the metal plate according to the embodiment of the invention of claim 3;

FIG. 6 is a schematic view showing a state where a heat pipe is attached to a metal plate in the conventional structure.

FIG. 7 is a schematic cross-sectional view of a metal fitting attaching portion showing a case where both end supporting metal fittings are used in the conventional structure.

FIG. 8 is a schematic cross-sectional view of a metal fitting attachment portion showing a case where a one-sided support metal fitting is used in a conventional structure.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Metal plate, 2 ... Heat pipe, 3, 11 ... End support metal fittings, 4, 7, 12, 14, ... Screws, 5, 13,
25 ... One side support metal fitting, 6 ... Thermal grease, 8 ... Gap, 9, 15, 19, 21, 24 ... Hold part, 1
0, 16, 20, 22, 23 ... Fixed part, 17 ... Plane deformation part, 18 ... Groove.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Koichi Masuko 1-5-1, Kiba, Koto-ku, Tokyo Fujikura Ltd. (72) Inventor Hitoshi Hasegawa 1-1-5, Kiba, Koto-ku, Tokyo Shareholders Inside Fujikura

Claims (3)

[Claims] 1. In a heat transfer structure using a heat pipe in which a heat pipe having a circular cross section is fixed on a metal plate by a metal fitting, a portion of the heat pipe to which heat is to be transferred between the heat pipe and the metal plate,
A heat transfer structure using a heat pipe, which is deformed into a flat surface and is in surface contact with a metal plate. 2. A heat transfer structure using a heat pipe in which a heat pipe having a circular cross section is fixed by metal fittings on a metal plate, in a portion of the metal plate where heat is to be exchanged with the heat pipe,
A heat transfer structure using a heat pipe, characterized in that a groove conforming to the shape of the heat pipe is provided, and the heat pipe is fixed by fitting the heat pipe into the groove and pressing it with metal fittings. 3. The radius of curvature of the portion of the metal fitting that contacts the heat pipe and presses the heat pipe is smaller than the radius of curvature of the heat pipe, and is formed of an elastic metal material. A heat transfer structure using the heat pipe according to claim 1 or 2.