JPH09324992A - Radiation fins of heat pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a refrigerator having radiation fins on heat pipes, wherein the refrigerator can reduce noise at a level that a user hardly can hear noise. SOLUTION: A heat pipe 15 is fixedly secured to one side of a plurality of radiation fins 2 while assuring a sufficient heat transfer. A connecting rod 1 has one end 2 fixedly secured to the other side of these radiation fins 2. The other end 1a of the connecting rod 1 is connected with a movable element 8a of an actuator 8 which comprises a coil 8c, a return spring 8b and the like. A current having a frequency of 30 Hz or less which a man can hardly hear is supplied to a pair of electric terminals T so as to vibrate the radiation fins 2 in a direction of fin plate thickness.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat radiating fin integrated with a heat pipe of a cooling unit of an electronic refrigerating refrigerator (hereinafter referred to as a refrigerator) using a thermoelectric element such as a Peltier element.

[0002]

2. Description of the Related Art FIG. 5 shows the structure of the main cooling function of a conventional refrigerator according to the present invention. The refrigerator comprises a refrigerator housing 10 filled with a heat insulating agent and a door 10a to form a cold storage space, and the cooling unit includes an internal heat absorption fin 11, a heat transfer block 12,
Thermoelectric element 13, heat receiving block 14 and heat pipe 1
5 and the radiation fin 16.

The cooling unit has a thermoelectric element 13 as a center, and a heat transfer block 12 and an internal heat absorption fin 11 on a heat absorption surface.
Are superposed on the heat radiating surface so that the heat receiving block 14 can be heat-transfer-coupled.
It is integrated with the end of 5. The principle of refrigerator cooling is
By energizing the thermoelectric element 13, heat is absorbed from the surface of the thermoelectric element 13 on the heat transfer block 12 side, that is, the cooling surface, and the Peltier effect of radiating heat from the surface of the thermoelectric element 13 on the heat receiving block 14 side, that is, the heat generating surface is utilized. ing. Further, the inside of the refrigerator is cooled via the heat transfer block 12 and the internal heat absorbing fins 11, and the absorbed heat is radiated to the atmosphere via the heat receiving block 14, the heat pipe 15, and the heat radiating fins 16.

FIG. 6 shows the structure of the heat pipe 15 and the radiation fin 16. The heat radiation fin 16 is the heat pipe 1.
5 is press-fitted and fixed, and thereby heat-transfer coupled. In order to further improve this heat conduction, an adhesive agent having good heat conductivity is used on the press-fitting surface of the heat radiation fin 16 if necessary. FIG. 7 is a rear view of this refrigerator. The radiation fins 16 are located on the back of the refrigerator, and the heat absorbed from the inside of the refrigerator and the thermoelectric element 1
The Joule heat of 3 itself is moved in the heat pipe 15 and heat is exchanged with the ambient air by the air flow 99 of natural convection of the air around the radiation fin 16.

This refrigerator has no moving parts as a cooling unit and realizes noiselessness due to natural convection of heat radiation, and is optimal for installation in a place where noiselessness is required such as a hotel bedroom or a patient room. .

[0006]

In the above-mentioned example, since the heat radiation depends on natural convection, the fin intervals are increased in order to increase the ascending air current. Also, natural convection has an extremely small amount of heat exchange per unit area compared to forced convection,
It is necessary to increase the surface area of the fin. Further, when the air is forced to flow on the surface of the fins by forced convection to make it compact, it is suitable for heat exchange, but it cannot meet the requirement of noise-free.

An object of the present invention is to provide a refrigerator in which no noise can be heard.

[0008]

According to the present invention, in a radiating fin fixed to a heat pipe with good heat conductivity and configured as a thin plate fin array, each fin is fixed to a heat pipe at one end and to a connecting shaft at the other end. An actuator is connected to one end of the connecting shaft, and the actuator has a structure in which the connecting shaft vibrates the heat radiation fins in the plate thickness direction.

According to a second aspect of the present invention, in a radiation fin fixed to a heat pipe with good heat conductivity and configured as a thin plate fin array, one end of each fin is fixed to the heat pipe and the other end is connected. It is constructed by combining that it is not in contact with the connecting shaft when fixed to the shaft, one end of the connecting shaft is connected to the actuator, and the actuator has a structure that vibrates the heat radiation fin fixed to the connecting shaft in the plate thickness direction. .

According to a third aspect of the present invention, in a heat radiating fin fixed to a heat pipe with good heat conductivity and configured as a thin plate fin array, each fin is provided with a fan plate parallel to the heat radiating surface near the heat radiating surface. The fan plate is integrally formed by a connecting shaft, and one end of the connecting shaft is connected to an actuator. The actuator has a structure in which the connecting plate moves the fan plate in the plate thickness direction.

According to a fourth aspect of the present invention, in the heat radiating fins for the heat pipe according to the third aspect, each fin has a notch at the other end opposite to the heat pipe, and the fin at the end of the heat pipe is provided. A flexible plate that positions the end of the connecting shaft is fixed to the outside of the, and a connecting plate that is fixed between the cooling fins and a fan plate that moves air is fixed at one end after passing through the notches of each fin. The structure is fixed to a flexible plate, the other end is connected to an actuator, and the actuator has a structure in which a sector plate fixed to a connecting shaft is moved in the plate thickness direction.

Further, according to the present invention, in the heat radiating fin for a heat pipe according to any one of claims 1 to 4, the actuator is electromagnetic and the frequency is 0.1 to 0.1.
The structure is driven at 30 Hz. Further, the present invention
The heat dissipation fin of the heat pipe according to any one of claims 1 to 4, wherein the actuator is a ceramic vibration actuator, and the frequency is 20 to 1000.
The structure is driven at kHz.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention provides a refrigerator in which cooling fins are flexible, and a fan plate is provided between the cooling fins to drive an actuator at a frequency that is difficult for humans to hear, thereby enhancing the heat radiation effect. Is.

[0014]

【Example】

Embodiment 1 FIG. 1 shows an embodiment of the present invention in which an actuator 8 for moving the radiation fin 2 is added to the configuration of the heat pipe and the radiation fin. The heat pipes 15 are press-fitted and fixed to one end of the rectangular radiating fins 2 to form rows of the radiating fins 2 having a substantially equal pitch. An adhesive having excellent heat conductivity may be used regardless of press fitting. Further, the coupling shaft 1 is fixed near the other end 2a of the heat radiation fin 2 in parallel with the heat pipe 15, and all the heat radiation fins 2 are also fixed in the same manner. On the other hand, one end portion 1a of the connecting shaft 1 is coupled to the movable portion 8a of the actuator 8 that vibrates the heat radiation fin 2 in the thickness direction.

With this structure, a power source (not shown) supplies a current to the coil 8c through the pair of terminals T to move the mover 8a and the return spring 8b in the compression direction. 2 can also be bent in the same direction. Next, when the power of the coil 8c is cut off, the mover 8a is returned to the right by the return spring 8b, and the radiating fin 2 is also returned by the connecting shaft 1. That is, power is supplied to the coil 8c.
By shutting off, the radiation fin 2 can be vibrated in the thickness direction of the same movement as the fan, and the ascending airflow along the radiation surface is accelerated to produce the same effect as forced convection and promote heat transfer. The heat dissipation effect is improved, and the number and size of the heat dissipation fins, that is, the volume of the heat dissipation fins can be reduced, and the size can be reduced.

A power supply (not shown) for energizing / interrupting electric power can be easily realized by combining it with an oscillator that oscillates at a low frequency and a power switching circuit that turns on / off according to its oscillation frequency, which makes the frequency hard to hear and uncomfortable. If the frequency is set to about 30 Hz or less, which is not felt, the refrigerator can be used as a noiseless refrigerator at a distance. In addition, it goes without saying that the voltage waveform may be other waveforms.

Example 2 FIG. 2 shows an example in which a ceramic vibration actuator 9 is used as an actuator. The ceramic vibration actuator 9 is fixed to the connecting shaft 1 in the vicinity of the end 2a of the radiation fin 2 in parallel with the heat pipe 15 as in FIG. 1, and one end 1a is fixed to the end of the ceramic vibration actuator 9. Each element of the ceramic vibration actuator 9 that changes in the axial direction when a voltage is applied is wired as shown in the figure, and when a voltage is applied from the pair of terminals U, the connecting shaft 1 is moved to the left and the radiation fin is bent to the left. .
When the voltage is cut off, it returns to a state of no voltage as in Fig.
By repeating this, the heat dissipation effect can be improved. Further, if the frequency of the power source is set to 20 kHz or more outside the audible range, it can be used as a noiseless refrigerator at a place slightly apart as in the first embodiment. Further, since the ceramic vibration actuator that can be easily driven at a high frequency is used, it is possible to reduce dust adhesion to the heat radiation fins by vibration, and it is possible to maintain the heat radiation characteristic for a long period of time.

Embodiment 3 FIG. 3 shows a main part of an example according to claim 2. A flexible radiating fin 2 having one piece fixed to the connecting shaft 1 and the other end fixed to the heat pipe 15, and a heat radiating fin 2 having one end fixed to the heat pipe 16 and a hole 3a not in contact with the connecting shaft 1 at the other end. The fins 3 are arranged alternately. When one end of the connecting shaft 1 is vibrated by the actuator shown in FIG. 1 or 2, the flexible radiating fins 2 oscillate between the radiating fins 3 to disturb the flow of air to improve the heat radiating effect. It can be used as a noiseless refrigerator in a remote place. Since the number of radiating fins to be further vibrated is about half of the total, the driving force for vibration can be halved compared to the first and second embodiments.

The heat radiation fins 2 may be made of a material having no heat radiation effect, and the heat radiation fins 2 and the heat radiation fins 3 may not be arranged alternately. Example 4: FIG. 4 shows a main part of an example according to claim 4.
The side opposite to the cutout 4a of the radiation fin 4 is the heat pipe 1
5, a flexible plate 6 is provided on the outside of the radiating fin 4, one end of which is fixed to the heat pipe 15 and the other end of which is fixed to the end of the connecting shaft 1. On the other hand, when the fan plates 5 that are inserted between the radiating fins 4 are fixed to the connecting shaft 1, the cutouts 4a are passed through, one end is fixed to the flexible plate 6, and the other end is vibrated by the actuator of FIG. 1 or 2. The fan plate 5 vibrates between the heat radiation fins 4 to disturb the flow of air to improve the heat radiation effect, the driving force of vibration can be extremely reduced, and the fan plate 5 can be used as a noiseless refrigerator at a distance. it can.

[0020]

【The invention's effect】

1) Since one side of all the flexible radiating fins is vibrated in the thickness direction, the same cooling effect as forced ventilation can be obtained, the volume of the radiating fins can be reduced, and a small cooling unit can be provided. (Claims 1, 5, 6, 7, 8) 2) Since one side of the flexible radiating fins is vibrated in the thickness direction with every other one side, air is forced in and out, and more efficient forced ventilation is achieved. The same cooling effect can be obtained, the driving force of the actuator can be about half of that of claim 1, and a small and inexpensive cooling unit can be provided. (Claims 2, 5, 6, 7, and 8) 3) Since a fan plate that can vibrate integrally in the thickness direction is provided near each radiating fin surface, air enters and leaves almost the entire surface of the radiating fin, resulting in extremely high efficiency. However, since the same cooling efficiency as that of forced draft can be obtained and the driving force of the actuator can be extremely small, it is possible to provide a more compact and inexpensive cooling unit.
(Claims 3, 4, 5, 6, 7, and 8) 4) A fan plate that can vibrate in the thickness direction is integrally provided near each radiation fin surface, and the free end is held by a flexible plate. Since it is vibrated, the vibration is stable without being affected by the inertia of the fan plate as compared with the third aspect, and a better cooling effect can be obtained. (Claims 4, 5, 6, 7, and 8) 5) Since the actuator that vibrates the connecting shaft is electromagnetically determined, a small-sized and inexpensive cooling unit can be provided. (Claims 5 and 6) 6) Since the drive frequency of the actuator is limited to the low-frequency hearing loss range, it is possible to provide a cooling unit that feels silent at a distance. (Claim 6) 7) Since the actuator for vibrating the connecting shaft is set to the ceramic vibration actuator, a small cooling unit can be provided. (Claims 7 and 8) 8) Since the drive frequency of the actuator is limited to the high-frequency hearing loss range, it is possible to provide a cooling unit that feels silent at a distance and is less susceptible to dust adhesion. (Claim 8)

[Brief description of drawings]

FIG. 1 is an explanatory diagram of an embodiment of the present invention.

FIG. 2 is an explanatory view of another embodiment of the present invention.

FIG. 3 is a perspective view of a heat dissipation fin of the heat pipe according to claim 3;

FIG. 4 is a perspective view of a heat dissipation fin of the heat pipe according to claim 4;

FIG. 5 is a perspective view of a conventional electronic refrigerator.

FIG. 6 is a perspective view of a conventional heat pipe and a radiation fin.

FIG. 7 is a rear view of a conventional electronic refrigerator.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Connection shaft 2 Radiation fins 3 Radiation fins 3a Hole 5 Fan plate 11 Refrigerator housing 15 Heat pipe 16 Radiation fins

Claims (8)

[Claims] 1. A radiating fin that is fixed to a heat pipe with good heat conductivity and is configured as a thin plate fin array. Each fin has one end fixed to a heat pipe and the other end fixed to a connecting shaft, and one end of the connecting shaft is An actuator is connected, and the actuator vibrates the heat radiation fins in the plate thickness direction by a connecting shaft. 2. A radiating fin that is fixed to a heat pipe with good heat conductivity and is configured as a thin plate fin array. Each fin has one end fixed to the heat pipe and the other end.
It is constructed by combining with the connecting shaft not contacting with the connecting shaft. One end of the connecting shaft is connected with an actuator, and the actuator vibrates the heat radiation fin fixed on the connecting shaft in the plate thickness direction. A heat-dissipating fin for heat pipes. 3. A radiating fin that is fixed to a heat pipe with good heat conductivity and is formed as a thin plate fin array. Each fin is provided with a fan plate parallel to the radiating surface near the radiating surface, and the fan plates are connected to each other. A heat radiating fin for a heat pipe, characterized in that the connecting shaft is integrally formed by a shaft, one end of which is connected to an actuator, and the actuator moves a fan plate in the plate thickness direction by a connecting rod. 4. The heat dissipating fin for a heat pipe according to claim 3, wherein each fin is provided with a notch at the other end opposite to the heat pipe, and the end of the connecting shaft is provided outside the fin at the end of the heat pipe. The flexible shaft for positioning is fixed, and the connecting shaft, which is inserted between the cooling fins and fixed with the fan plate for moving the air, has one end fixed to the flexible plate after passing through the notch of each fin. The other end is connected to an actuator, and the actuator moves a fan plate fixed to the connecting shaft in the plate thickness direction. 5. The heat radiating fin for a heat pipe according to any one of claims 1 to 4, wherein the actuator is an electromagnetic type. 6. The heat radiating fin according to claim 5, wherein the actuator is driven at a frequency of 0.1 to 30 Hz. 7. The heat radiating fin for a heat pipe according to claim 1, wherein the actuator is a ceramic vibration actuator. 8. The heat radiating fin for a heat pipe according to claim 7, wherein the actuator is driven at a frequency of 20 to 1000 kHz.