JP2022189543A - Pin fin for heat exchanger and heat exchanger - Google Patents

Abstract

To improve the heat dissipation performance of a pin fin 5 for a heat exchanger.SOLUTION: In at least a part of an area of a side surface of a pin fin 5, a protrusion or a guide groove 6 extending obliquely in an axial direction of the pin fin 5.SELECTED DRAWING: Figure 3

Description

TECHNICAL FIELD The present invention relates to a heat sink using a large number of pin fins in a heat exchanger core, and relates to a heat exchanger useful as a heat sink for cooling various electronic components such as inverters mounted on electric vehicles and hybrid vehicles.

The heat sink described in Patent Document 1 below has a large number of pin fins erected on the surface of a base portion of a metal plate as a heat exchanger core, and each pin fin has a bulging portion that bulges in the circumferential direction at its root. was attached to the surface of the base portion of the metal plate via the

JP-A-2006-114688

The unevenness formed on the surface of the conventional pin fins is merely means for increasing the heat transfer area, and the surface of the pin fins in the vicinity of the base portion is not formed with unevenness.
The effect of promoting heat transfer by such pin fins is not sufficient, and pin fins with even higher effects and heat exchangers using such pin fins have been desired.
An object of the present invention is to solve the problems of the conventional pin fins.

The present invention according to claim 1 is a pin fin for a heat exchanger,
The heat exchanger pin fin is characterized in that a ridge or guide groove 6 extending obliquely in the axial direction of the pin fin 5 is formed on at least a part of the side surface of the shaft of the pin fin 5 .

The present invention according to claim 2 is a heat exchanger comprising the pin fins according to claim 1,
having a plate-like portion 7b,
One surface of the plate-like portion 7b has a heat transfer surface with which the heat exchange object 1 is in thermal contact, and the other surface through which the fluid 2 flows is provided with a plurality of the pin fins 5,
The heat exchanger is characterized in that the ridges or guide grooves 6 are formed at least on the side surface in the vicinity of the plate-like portion 7b.

The present invention according to claim 3 is the heat exchanger pin fin according to claim 1,
The ridges or guide grooves 6 are pin fins for a heat exchanger that are formed in an annular shape that bends in the vertical direction around the pin axis.

In the first aspect of the invention, the pin fins 5 are at least partly formed with ridges or guide grooves 6 extending obliquely in the direction of the pin axis. A directional velocity component is generated and the temperature distribution of the fluid 2 in the axial direction of the pin is averaged.

In the second aspect of the invention, since the ridges or guide grooves 6 are formed at least on the side surfaces near the plate-like portion 7b, the fluid near the plate-like portion 7b, which is greatly affected by heat transfer, is effectively The heat transfer promoting effect of the pin fins 5 is further improved by the fact that the pin fins 5 are sequentially replaced and repeated.

In the third aspect of the invention, the ridges or guide grooves 6 are formed in an annular shape that bends in the vertical direction around the pin axis, so that the fluid 2 has velocity components in the upward and downward directions. It is appropriately generated, and the effect of promoting heat transfer by the pin fins 5 is improved.
The improvement of this effect does not depend on the main direction of the fluid 2 flowing into the pin fins 5 .

FIG. 2 is an explanatory diagram showing the essential parts of the pin fin 5 of the present invention, where (A) is a front view of the pin fin 5, (B) is a cross-sectional view of (A) taken along line BB, and (C) is the pin fin of the same embodiment. 5 is a perspective view of the essential part of the assembly 4 of 5, and (D) is a developed view of the pin fin 5 around its axis. FIG. 2 is an exploded perspective view of a heat exchanger having the same pin fins 5; A perspective view (A) showing the assembled state, and a cross-sectional view (B) taken along line BB of (A). Explanatory drawing which shows the effect|action of the same Example. Explanatory drawing of 2nd Example of this invention. FIG. 10A is a perspective view of a main part of a third embodiment of the present invention, and FIG. FIG. 4A is a perspective view of a main part of a fourth embodiment of the present invention, and FIG.

Next, an embodiment of the present invention will be described based on the drawings.

1 to 4 show a first embodiment of the present invention, FIG. 1A is a front view of a pin fin 5 in the first embodiment, and FIG. It is a cross-sectional view, wherein (C) is a perspective view of the essential part of the assembly 4 of the pin fins 5 of the same embodiment, and (D) is a developed view of the pin fins 5 around the axis. 2 is an exploded perspective view of a heat exchanger having the same pin fins 5, FIG. 3(A) is a perspective view showing its assembled state, and FIG. 3(B) is an arrow BB in FIG. It is a cross-sectional view. FIG. 4 is an explanatory diagram showing its action.

As shown in FIG. 1, the pin fin 5 for a heat exchanger of this embodiment has a ridge or guide groove 6 extending obliquely in the axial direction of the pin fin 5 on at least a part of the side surface of the shaft of the pin fin 5 . .
In this example, the pin fin 5 is formed in the shape of a quadrangular prism, and a plurality of guide grooves 6 are formed on the second side surface 5b and the fourth side surface 5d as shown in the pair of opposing side surfaces (FIG. 1(D)) of the axis. ing. Each guide groove 6 is formed obliquely downward with respect to the mainstream direction of the fluid 2, as shown in FIG. It is preferable that the guide grooves 6 formed on the pair of opposing side surfaces are inclined in the same direction. As shown in FIG. 1A, it is preferable that a plurality of guide grooves 6 be formed at intervals in the axial direction of the pin on the side surface where the guide grooves 6 are formed.

As shown in FIGS. 2, 3A, and 3B, the plate-like portion 7b has a heat transfer surface on one side thereof with which the heat exchange object 1 is in thermal contact, through which the fluid 2 flows. A plurality of pin fins 5 are erected on the other surface. As an example, the heat exchange object 1 is attached with a heating element such as a semiconductor.
The guide grooves 6 of the pin fins 5 are mounted so that the side surfaces in which the guide grooves 6 are formed are arranged parallel to the mainstream direction of the fluid 2, as shown in FIGS. be done.
In this example, as shown in FIG. 2, the casing 7 of the heat exchanger is formed with a recess 7a that serves as the flow path 3 for the fluid 2, and the assembly 4 of a plurality of pin fins 5 is housed in the recess 7a. , the plate-like portion 7b is fitted into the recess 7a.
The flow path 3 is formed by an inlet side header 3a, an outlet side header 3b, and a portion in which an assembly 4 of pin fins 5 is arranged in the middle thereof.
As shown in FIGS. 2 and 3A, a pair of pipes are provided on the outer circumference of the casing 7 . The fluid 2 flows into the inlet side header 3a from one pipe, flows through the portion where the assembly 4 of the pin fins 5 is formed, reaches the outlet side header 3b, and flows out from the other pipe. The mainstream direction of the fluid 2 is the direction in which the fluid 2 goes from the inlet side header 3a to the outlet side header 3b.

In this example, when the fluid 2 flows through the flow path 3, it is guided obliquely downward to the right in the plane of the drawing by the guide grooves 6 of the pin fins 5, as shown in FIG.
When the fluid 2 flows in this way, a velocity component in the direction of the pin axis is generated in the fluid 2 passing through the side surfaces of the pin fins 5 , and the temperature distribution of the fluid 2 in the direction of the pin axis is averaged. Improves heat-promoting effect.
Further, as shown in FIG. 4, since the guide groove 6 of each pin fin 5 is also formed in the vicinity of the plate-like portion 7b, the fluid in the vicinity of the plate-like portion 7b, which is greatly affected by heat transfer, is effectively replaced. By repeating this, the effect of promoting heat transfer by the pin fins 5 is further improved.
Regarding the effect of promoting heat transfer by the pin fins 5, a suitable structure is a structure in which the guide grooves 6 are inclined downward with respect to the mainstream direction of the fluid 2, as described above. However, the guide groove 6 can also have a structure that is inclined upward with respect to the mainstream direction of the fluid 2 .

Next, FIG. 5 is an explanatory diagram showing a second embodiment of the present invention.
It is desirable that the guide groove 6 also exist at the root portion between each pin fin 5 and the plate-like portion 7b.
In this example, a guide groove 6 is formed to reach the base portion, and an auxiliary guide groove 6a is formed.

Next, FIG. 6 shows a third embodiment of the present invention, in which FIG. 6A is a perspective view of essential parts and FIG. In this embodiment, a guide groove 6 formed on the outer periphery of each pin fin 5 is formed in an annular shape. The annular guide groove 6 is formed in a wavy shape when the pin fins 5 are deployed around the axis.
Appropriate upward and downward velocity components are generated in the fluid 2, and the effect of promoting heat transfer by the pin fins 5 is improved.
The improvement of this effect does not depend on the main direction of the fluid 2 flowing into the pin fins 5 .

Next, FIG. 7 shows a fourth embodiment of the present invention. In this example, each pin fin 5 is formed in a columnar shape, and an annular guide groove 6 whose unfolded state is wavy is formed on the outer periphery thereof. .
In this example as well, upward and downward velocity components are appropriately generated in the fluid 2, and the effect of promoting heat transfer by the pin fins 5 is improved.

[Modification]
The cross-sectional shape of the pin fins 5 of the present invention is not limited to the above embodiment, and may be various polygonal shapes. Further, in the above embodiment, the guide grooves 6 are formed on the outer periphery of the pin fins 5, but instead of this, protrusions may be formed on the outer periphery of the pin fins 5. FIG.
As the heat exchanger provided with the pin fins 5 of each of the above embodiments, the casing 7 having the concave portion 7a shown in FIGS. When adopting this heat exchanger structure, a seal 10 is accommodated in the annular groove 8 surrounding the recess 7a. The plate-like portion 7b of this heat exchanger is detachably fixed by fixing metal fittings such as screws.
However, the structure of the casing 7 of the heat exchanger is not limited to this.
For example, the plate-like portion 7b may be fixed to the main body of the casing 7 by brazing so that the plate-like portion 7b cannot be attached or detached. If the plate-like portion 7b is made non-detachable, the formation of the seal 10 and the annular groove 8 for the seal 10 becomes unnecessary. In this case, the main body of the casing 7 can be formed in the shape of a shallow dish with the same material and thickness as the plate-like portion 7b.

INDUSTRIAL APPLICABILITY The present invention can be used, for example, as a heat exchanger such as an inverter cooler mounted on an electric vehicle or a hybrid vehicle.

REFERENCE SIGNS LIST 1 heat exchange object 2 fluid 3 flow path 4 aggregate 5 pin fin 5a first side 5b second side 5c third side 5d fourth side 6 guide groove 6a auxiliary guide groove 7 casing 7a concave portion 7b plate-like portion 7c inner surface 8 annular groove 10 seal

Claims (3)

A pin fin for a heat exchanger, comprising:
A pin fin for a heat exchanger, wherein a ridge or guide groove (6) extending obliquely in the axial direction of the pin fin (5) is formed on at least a part of the axial side surface of the pin fin (5). A heat exchanger comprising the pin fins according to claim 1,
having a plate-like portion (7b),
One surface of the plate-shaped portion (7b) has a heat transfer surface with which the heat exchange object (1) is in thermal contact, and the other surface through which the fluid (2) flows has a plurality of pin fins (5 ) is erected,
A heat exchanger, wherein the ridges or guide grooves (6) are formed at least on a side surface in the vicinity of a plate-like portion (7b). In the heat exchanger pin fin according to claim 1,
A pin fin for a heat exchanger, wherein the ridges or guide grooves (6) are formed in an annular shape that bends vertically around the pin shaft in a wavy shape.

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