JPH0363838B2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a heat dissipation system for cooling a heating element such as an electronic element, which is a main component of an electronic device [Technical background of the invention and problems thereof] Examples of heat dissipation systems include those shown in FIGS. 3 and 4. First, the third
In the figure, a heat dissipating body 107 having a plurality of heat dissipating fins 105 is bonded to the other side of a circuit board 103 having an electronic element 101 attached to one side. The heat generated in the electronic element 101 is conducted from the circuit board 103 to the heat radiator 107, and is radiated to the outside from the heat radiating fins 105 to the electronic element 101 and the circuit board 1.
03 cooling is performed.

However, in such a structure of the heat dissipation system, the thermal resistance due to the adhesion between the circuit board 103 and the heat dissipation body 107 is large, making it difficult to efficiently dissipate heat from the heat dissipation fins 105. Furthermore, when the electronic element 101 or the like is locally heated, there is a problem in that heat is not sufficiently radiated because heat conduction is mainly carried out in a few localized portions of the plurality of heat radiation fins 105.

On the other hand, the heat dissipation system in Figure 4 is based on the circuit board 1.
A container-shaped heat pipe 109 is fixed on the circuit board 103, and an evaporation chamber 111 is defined on the circuit board 103. A refrigerant 113 is accommodated at the bottom of the evaporation chamber 111 on the side of the circuit board 103, and a plurality of heat radiation fins 115 are provided on the outer surface of the heat pipe 109. Therefore, in this conventional example, heat generation in the electronic element 101 is caused by the refrigerant 11.
3 absorbs heat. The refrigerant 113 evaporates due to heat absorption, and is cooled on the upper side of the heat pipe 109 by heat radiation from the heat radiation fins 115, and is condensed and liquefied, and drips into the bottom of the evaporation chamber 111 again. Therefore, the thermal resistance does not increase as in the conventional example shown in FIG. Also, the circuit board 103 can be cooled more effectively than in the conventional example shown in FIG.

By the way, in the conventional example shown in FIG. 4, in order to further increase the cooling effect, it is conceivable to provide a fan propeller 117 and perform forced cooling using the cooling air from the fan propeller 117. However, in this case, a drive motor 119 is required to drive the fan propeller 117, and the electronic element 1
Fan propeller 1 according to heat generation temperature changes such as 01
In order to control the cooling air generated by the electronic device 17, a sensor for detecting the heat generation temperature of the electronic element 101, a control device for controlling the drive motor 119 based on this sensor, etc. are required, which may increase costs. To address these problems, the applicant has already proposed a new heat dissipation system as shown in FIG. This FIG. 5 is conceptually shown, and a turbine propeller 123 rotatably supported by a heat pipe 109 via a bearing 121 is connected to a refrigerant 1.
The inner magnet 1 is rotated by the evaporation flow of the turbine propeller 123 and rotates integrally with the turbine propeller 123.
25 causes the outer magnet 127 magnetically coupled to the inner magnet 125 to rotate. Then, due to the rotation of the outer magnet 127, a bearing 129 is attached to the outside of the heat pipe 109.
A fan propeller 1 rotatably supported via
31 is made to rotate. Therefore, the fan propeller 131 can be rotated without requiring an external drive source such as a drive motor, and efficient heat radiation can be performed. The generation of the evaporative flow of the fan propeller 131 is controlled, and the rotation of the fan propeller 131 can be automatically controlled without the need for a control device, and the heat dissipation efficiency can be improved while suppressing cost increases.

[Object of the invention] This invention has been made in consideration of the above-mentioned conventional problems,
This is a further development of the heat dissipation system previously submitted by the applicant, and aims to further improve heat dissipation efficiency while suppressing cost increases. The purpose is to provide a heat dissipation system that can be used.

[Summary of the Invention] In order to achieve the above object, the present invention provides a container-shaped heat pipe that is attached to a heating element and partitions an evaporation chamber, and a refrigerant that is housed inside the evaporation chamber and absorbs heat from the heating element and evaporates. a turbine propeller rotatably supported inside the evaporation chamber and rotated by the evaporation flow of the refrigerant; an inner magnet integrally supported on the turbine propeller side and concentric with the turbine propeller; and the heat pipe. A fan propeller is rotatably supported on the outside and generates wind for cooling the heat pipe by rotation; It is composed of an outer magnet that is magnetically coupled.

[Embodiment] An embodiment of the present invention will be described in detail below with reference to FIG.

A circuit board 3 on which an electronic element 1 as a heating element is attached is a main component of an electronic device, and a container-shaped heat pipe 5 is mounted on a bolt 7 on the circuit board 3.
, and an evaporation chamber 9 is defined on the circuit board 3 . A refrigerant 11 that comes into contact with the circuit board 3 is housed at the bottom of the evaporation chamber 9 . This refrigerant 11 is configured to absorb heat from the circuit board 3 side and evaporate.

On the other hand, a turbine propeller 13 is rotatably supported inside the evaporation chamber 9 and rotated by the evaporation flow of the refrigerant 11. This turbine propeller 13 is attached to the lower end of an inner blade shaft 15 having an axis in the vertical direction. A hollow portion 15a is formed in the axial center of the inner blade shaft 15, and the weight of the inner blade shaft 15 is reduced.
The inner blade shaft 15 is rotatably supported via a first inner bearing 17a and a second inner bearing 17b. First inner bearing 17
a is supported by the heat pipe 5, and the second inner bearing 17b is supported within a bearing socket 19 attached to the top of the heat pipe 5.
A collar 20 is interposed between the inner races of these inner bearings 17a and 17b.

An inner magnet 23 is fixed to the top of the inner blade shaft 15 by a bolt 21. Therefore, the inner magnet 23 is integrally supported on the turbine propeller 13 side and is configured concentrically with the turbine propeller 13.

On the other hand, a fan propeller 25 is provided outside the heat pipe 5, and this fan propeller 25 is supported by an outer blade shaft 27. This outer wing shaft 27 is arranged concentrically with respect to the inner wing shaft 15, and has a hollow portion 2 at the shaft center for weight reduction.
7a, and a first one at the top of the bearing socket 19.
Outer bearing 29a and second outer bearing 29
It is rotatably supported via b. This first
outer bearing 29a and second outer bearing 29b
A collar 31 is interposed between the inner laces of
The upper surface of the inner race of the first outer bearing 29a is held down by a retaining plate 35 fixed to the bearing socket 19 with bolts 33.

A skirt portion 2 is provided at the lower end of the outer blade shaft 27 and extends to the outer circumference of the inner magnet 23 in the rotational direction.
7b is formed. And this skirt part 2
An outer magnet 37, which is disposed outside the bearing socket 19 and around the outer circumference of the inner magnet 23 in the rotational direction, is supported by the outer magnet 7b. Therefore, the outer magnet 37 is integrally supported by the fan propeller 25, is arranged around the outer circumference of the inner magnet 23 in the rotational direction, and is magnetically coupled to the inner magnet 23. Note that the electronic element 1 is covered by a cover 39 fixed to the circuit board 3.

Next, the operation of the above embodiment will be described.

When the electronic element 1 generates heat, the refrigerant 11 in contact with the circuit board 3 absorbs heat and evaporates. As a result of the evaporation of the refrigerant 11, an evaporation flow is formed in the evaporation chamber 9, and the turbine propeller 13 is rotated. This rotation of the turbine propeller 13 causes the inner magnet 23 to rotate concentrically with the turbine propeller 13 via the inner blade shaft 15 . When the inner magnet 23 rotates in this manner, the outer magnet 37, which is magnetically coupled to the inner magnet 23 outside the bearing socket 19, also receives a rotational force. The rotational force of the outer magnet 37 is transmitted to the fan propeller 25 via the outer blade shaft 27, and the fan propeller 25 is rotated around its axis. The rotation of the fan propeller 25 generates wind for cooling the heat pipe 5, thereby cooling the outer wall surface of the heat pipe 5. When the outer wall surface of the heat pipe 5 is forcedly cooled in this way, heat radiation from the heat pipe 5 is promoted, and heat is efficiently radiated from the steam in the evaporation chamber 9 to the outside via the heat pipe 5, and the electronic element 1 can be effectively cooled. The vapor flow that has been heat radiated as described above above the evaporation chamber 9 is condensed and liquefied, and is dripped to the bottom side of the evaporation chamber 9.

On the other hand, when the heat generation of the electronic element 1 increases, evaporation of the refrigerant 11 is promoted accordingly. Therefore, the rotation of the fan propeller 25 becomes faster, and the cooling air generated by the fan propeller 25 becomes stronger in accordance with the magnitude of heat generation. Further, when the heat generation of the electronic element 1 is not so high, the amount of evaporation of the refrigerant 11 is reduced, and the cooling air generated by the fan propeller 25 is correspondingly weakened. Therefore, the cooling air is automatically adjusted according to the heat generating body of the electronic device 1. Even when the electronic element 1 is locally heated, the refrigerant 11 evaporates accordingly, and there is no problem in cooling the local heating. In addition, especially in the embodiment of the present invention, the outer magnet 3
7 are arranged around the outer periphery of the inner magnet 23 in the rotational direction, the force of attraction between the inner magnet 23 and the outer magnet 37 is caused by the first inner bearing 17a,
It does not act on the second inner bearing 17b, the first outer bearing 29a, and the second outer bearing 29b. Therefore, when compared with the previous proposal as shown in FIG.
1. An unreasonable force acts on the outer bearing 129 in the axial direction, and the evaporation flow causes the turbine propeller 1
23, and in conjunction with this, a fan propeller 131
If it is rotated, there is a possibility that a large resistance will be generated, which may impede the improvement of the heat dissipation rate. In contrast, in the embodiment of the present invention, as described above, it is possible to obtain smooth rotation of the turbine propeller 13 and the fan propeller 25 without applying unreasonable force to each bearing 17a, 17b, 29a, 29b.
It is possible to dramatically improve heat dissipation efficiency.

FIG. 2 shows another embodiment of this invention,
Stator blades 41 are provided inside the evaporation chamber 9.
Therefore, in this case, the evaporated flow of the refrigerant 11
1 rectifies the flow in the direction in which the turbine propeller 13 rotates efficiently, thereby increasing the rotational efficiency of the turbine propeller 13 and further improving the heat dissipation efficiency.

Note that this invention is not limited to the above embodiments. For example, heat dissipation fins may be provided on the outer surface of the heat pipe 5.

[Effects of the Invention] As is clear from the above, according to the configuration of the present invention, the thermal resistance during heat radiation is lower than that of the conventional example, and heat can be efficiently radiated, and local heat generation can be prevented. Heat can be dissipated without any problem. Furthermore, forced cooling is possible without the need for an external drive source, and the rotation of the fan propeller is automatically controlled according to the degree of heat generation without the need for a control device, improving heat dissipation efficiency while suppressing cost increases. can be achieved. Furthermore, in response to the previous proposal submitted by the present applicant, the attractive force between the inner magnet and the outer magnet is less likely to act as an unreasonable force on the bearings that support the fan propeller and the turbine propeller. Heat radiation efficiency can be improved.

[Brief explanation of drawings]

FIG. 1 is an overall sectional view of one embodiment of the present invention, FIG. 2 is an overall sectional view of another embodiment of the invention, and FIGS. 3 and 4 are overall sectional views of conventional examples.
FIG. 5 is an overall sectional view of the previous proposal. 1... Electronic element (heating element), 3... Circuit board (heating element), 5... Heat pipe, 9... Evaporation chamber,
11... Refrigerant, 13... Turbine propeller, 23
...Inner magnet, 25...Fan propeller, 3
7...Outer magnet.

Claims (1)

[Claims] 1. A container-shaped heat pipe attached to a heating element and partitioning an evaporation chamber, a refrigerant housed inside the evaporation chamber that absorbs heat from the heating element and evaporates, and a refrigerant rotatably supported inside the evaporation chamber. A turbine propeller is rotated by the evaporative flow, an inner magnet is integrally supported on the turbine propeller side and is concentric with the turbine propeller, and an inner magnet is rotatably supported on the outside of the heat pipe and rotates to cool the heat pipe. A heat dissipation system comprising a fan propeller that generates heat, and an outer magnet that is integrally supported on the fan propeller side, is arranged around the outer periphery of the inner magnet in the rotational direction, and is magnetically coupled to the inner magnet.