CN114636116A

CN114636116A - Heat conduction device and heat conduction method of LED high-power lighting lamp

Info

Publication number: CN114636116A
Application number: CN202210361578.4A
Authority: CN
Inventors: 李建平; 马二华
Original assignee: Mester Led Ltd
Current assignee: Mester Led Ltd
Priority date: 2022-04-07
Filing date: 2022-04-07
Publication date: 2022-06-17
Anticipated expiration: 2042-04-07
Also published as: CN114636116B

Abstract

The invention discloses a heat conduction device and a heat conduction method of an LED (light-emitting diode) high-power lighting lamp, and relates to the technical field of lighting devices. The heat conducting device of the LED high-power lighting lamp comprises a tower-shaped lamp cap, a shell is fixedly connected below the tower-shaped lamp cap, a filter screen is arranged on the side wall of the shell, a lampshade is fixedly mounted inside the shell, a heat conducting assembly is arranged inside the shell, a heat radiating assembly is arranged above the heat conducting assembly, and a swinging assembly and an anti-blocking assembly are arranged below the heat radiating assembly. According to the heat conduction device of the LED high-power lighting lamp and the heat conduction method thereof, the heat conduction assembly, the heat dissipation assembly, the swinging assembly and the beating assembly are matched for use, so that the heat dissipation effect of the heat radiator is better, the heat conduction pipe can be dissipated, the possibility that the filter screen is blocked by dust is avoided, the device can be used for normal air circulation and heat dissipation when in work, and the service life of the lighting lamp is prolonged.

Description

Heat conduction device and heat conduction method of LED high-power lighting lamp

Technical Field

The invention relates to the technical field of lighting devices, in particular to a heat conduction device and a heat conduction method of an LED high-power lighting lamp.

Background

The high-power LED lighting lamp brings another leap in the history of human lighting. However, a high-power LED faces a heat dissipation problem, 70% -85% of electric energy input by the existing LED is converted into heat, and the LED chip is very small, if the heat dissipation is poor, the temperature of the chip is increased, which causes uneven distribution of thermal stress, reduction of luminous efficiency of the chip, and reduction of lasing efficiency of fluorescent powder, thereby causing rapid deterioration of the LED chip and shortening of the service life of the device. Therefore, the upper parts of the LED lamps are provided with the larger aluminum alloy die-cast radiating fins, and the working temperature is reduced by utilizing air convection. The larger the power of the LED, the larger the area of the heat sink, and therefore the heat sink heat dissipation at the bottom of the chip depends on whether the area of the heat sink is large enough.

At present, when a high-power LED lighting lamp radiates heat, the heat is generally conducted and radiated through a radiator consisting of a heat conduction pipe and a heat radiating fin so as to reduce the temperature of the lamp, but when the lamp is reduced, the temperature of the radiator and the heat conduction pipe can be rapidly increased due to continuous heating of the lamp, and then the temperature reaches a certain range, in order to prolong the service life of the lamp, the heat radiation of the radiator and the heat conduction pipe needs to be accelerated, so that the purpose of reducing the temperature of the lamp is achieved, and the effect of prolonging the service life of the LED lighting lamp is achieved; in view of this, we propose a heat conduction device and a heat conduction method for an LED high-power lighting fixture.

Disclosure of Invention

Technical problem to be solved

Aiming at the defects of the prior art, the invention provides a heat conduction device and a heat conduction method of an LED high-power lighting lamp, and solves the problems in the background art.

(II) technical scheme

In order to realize the purpose, the invention is realized by the following technical scheme: the utility model provides a LED high-power illumination lamps and lanterns heat-transfer device, includes the turriform lamp holder, the below fixedly connected with casing of turriform lamp holder, be provided with the filter screen on the lateral wall of casing, the inside fixed mounting of casing has the lamp shade, the inside of casing is provided with heat-conducting component, heat-conducting component's top is provided with radiator unit, radiator unit's below is provided with swing subassembly and anti-clogging subassembly.

Preferably, the heat conducting assembly comprises an LED integrated chip, the LED integrated chip is mounted inside the housing, a heat absorbing fin is mounted on the upper side of the LED integrated chip, a heat conducting pipe is mounted at one end of the heat absorbing fin, which is far away from the LED integrated chip, a radiator at one end of the heat conducting pipe, which is far away from the heat absorbing fin, and baffles are arranged on two sides of the radiator.

Preferably, the heat dissipation assembly comprises a motor, the motor is fixedly connected to the inner wall of the shell, a rotating shaft is fixedly connected to an output shaft of the motor, and one end, far away from the motor, of the rotating shaft is highly connected with fan blades.

Preferably, the pivot runs through first bevel gear and with first bevel gear fixed connection, first bevel gear meshing has second bevel gear, first bevel gear's one end fixedly connected with bull stick is kept away from to second bevel gear, the bull stick runs through the bracing piece and rotates with the bracing piece to be connected, the one end fixed connection that the bull stick was kept away from to the bracing piece is on the inner wall of casing.

Preferably, the one end fixedly connected with disc of second bevel gear is kept away from to the bull stick, one side fixedly connected with fixed block of bull stick is kept away from to the disc, fixed block sliding connection is in the spout of slide, fixedly connected with montant on the outer wall of slide, the montant run through fixed chamber and with fixed chamber sliding connection.

Preferably, the swing assembly comprises a telescopic rod, one end of the telescopic rod is hinged to the outer wall of the vertical rod, the other end of the telescopic rod is fixedly connected with the long plate, and the telescopic rod is penetrated by the first fixing rod and is connected with the first fixing rod in a rotating mode.

Preferably, prevent that the jam subassembly includes the hinge bar, and the one end of hinge bar articulates on the outer wall of montant, the other end sliding connection of hinge bar is on the inner wall of drum, the inner wall of hinge bar and drum is through first spring elastic connection, the drum is run through by the second dead lever and is connected with the second dead lever rotation.

Preferably, one end of the cylinder, which is far away from the hinged rod, is slidably connected with a knocking rod, the knocking rod is elastically connected with the inner wall of the cylinder through a second spring, and one end of the knocking rod, which is far away from the cylinder, is fixedly connected with a knocking ball.

A heat conduction method of an LED high-power lighting lamp comprises the following steps:

s1: the LED integrated chip dissipates heat when working, and the dissipated heat is upwards conducted to the heat absorbing sheet;

s2: conducting the heat of step S1 from the heat absorbing sheet to the heat conducting pipe;

s3: and conducting the heat of the step S1 from the heat conduction pipe to a radiator for heat dissipation.

(III) advantageous effects

The invention provides a heat conduction device and a heat conduction method of an LED high-power lighting lamp. The method has the following beneficial effects:

(1) the heat conducting device and the heat conducting method of the LED high-power lighting lamp enable the lamp to continuously radiate heat through the use of the heat conducting assembly and the heat radiating assembly, the heat is conducted to the radiator from the LED integrated chip through the heat absorbing sheet and the heat conducting pipe to be radiated, meanwhile, the fan blades are driven by the motor to rotate to radiate the radiator, the air flow is accelerated, hot air is rapidly discharged, the effect of accelerating heat radiation is achieved, in addition, through the use of the baffle plate, the air flow formed by the rotation of the fan blades can completely pass through the radiator, the radiator can be in comprehensive contact with the air flow, the incomplete contact condition of the air flow and the radiator is effectively prevented, and the heat radiating effect of the radiator is better.

(2) The heat conducting device of the LED high-power lighting lamp and the heat conducting method thereof are used by matching the heat radiating assembly with the swinging assembly, when the motor rotates to drive the rotating shaft to rotate, the rotating rod can drive the disc to rotate through the transmission action of the first bevel gear and the second bevel gear, the fixed block can slide in the chute of the sliding plate, the sliding plate is driven to reciprocate up and down, under the limiting action of the fixed cavity, the vertical rod can reciprocate in the vertical direction, the telescopic rod is driven to move, under the action of the first fixed rod, the long plate can swing up and down by a certain range, the air circulation is further accelerated, the heat radiating efficiency is increased, meanwhile, the heat conducting pipe can be radiated, the temperature of the heat conducting pipe is reduced, and the effect of reducing the temperature of the lighting lamp is realized.

(3) The heat conducting device of the LED high-power lighting lamp and the heat conducting method thereof have the advantages that through the use of the heat radiating assembly and the anti-blocking assembly, when the vertical rod reciprocates in the vertical direction, the hinged rod can be driven to slide on the inner wall of the cylinder, the beating ball can beat the filter screen under the action of the second fixing rod, when the lamp is used, dust attached to the filter screen can be shaken off, the filter screen is effectively prevented from being blocked by the dust, and the heat radiating effect of the device is influenced.

Drawings

FIG. 1 is a schematic overall perspective structure of the present invention;

FIG. 2 is a front cross-sectional structural view of the present invention;

FIG. 3 is a schematic view of the structure A of FIG. 2 according to the present invention;

FIG. 4 is a schematic view of the structure B of FIG. 2 according to the present invention;

FIG. 5 is a side perspective view of the disk of the present invention;

fig. 6 is a schematic perspective view of the swing assembly of the present invention.

In the figure: 1. a tower-shaped lamp cap; 2. a housing; 3. filtering with a screen; 4. a lamp shade; 5. a heat conducting component; 6. a heat dissipating component; 7. a swing assembly; 8. an anti-clogging assembly; 51. an LED integrated chip; 52. a heat absorbing sheet; 53. A heat conduction pipe; 54. a heat sink; 55. a baffle plate; 61. a motor; 62. a rotating shaft; 63. a fan blade; 64. a first bevel gear; 65. a second bevel gear; 66. a rotating rod; 67. a support bar; 68. a disc; 69. a fixed block; 610. a slide plate; 611. a vertical rod; 612. a fixed cavity; 71. a telescopic rod; 72. a first fixing lever; 73. A long plate; 81. a hinged lever; 82. a cylinder; 83. a first spring; 84. a second fixing bar; 85. knocking the rod; 86. a second spring; 87. and (5) knocking the ball.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-6, the present invention provides a technical solution: a heat conducting device of an LED high-power lighting lamp comprises a tower-shaped lamp holder 1, the device can be conveniently installed by workers through the use of the tower-shaped lamp holder 1, a shell 2 is fixedly connected to the lower portion of the tower-shaped lamp holder 1, the lighting lamp can be protected and can be subjected to dustproof treatment through the use of the shell 2, a filter screen 3 is arranged on the side wall of the shell 2, cold and hot air can be effectively prevented from entering air when flowing through the use of the filter screen 3 and cold air enters the device, a lampshade 4 is fixedly arranged inside the shell 2, mosquitoes and mosquitoes can be prevented from attaching to the surface of the lighting lamp when dust enters the lighting lamp and mosquitoes through the use of the lampshade 4, a heat conducting component 5 is arranged inside the shell 2, the heat conducting component 5 comprises an LED integrated chip 51, the LED integrated chip 51 is arranged in the shell 2, the heat absorbing sheet 52 is arranged on the upper side of the LED integrated chip 51, the heat conducting pipe 53 is arranged at one end of the heat absorbing sheet 52 far away from the LED integrated chip 51, the heat radiator 54 is arranged at one end of the heat conducting pipe 53 far away from the heat absorbing sheet 52, the baffle plates 55 are arranged on two sides of the heat radiator 54, the heat on the LED integrated chip 51 can be absorbed through the heat absorbing sheet 52, meanwhile, the heat is conducted to the heat conducting pipe 53, the heat is conducted to the heat radiator 54 through the heat conducting pipe 53 for heat radiation, the heat of the LED integrated chip 51, the heat absorbing sheet 52 and the heat conducting pipe 53 is reduced, the temperature of the LED integrated chip is reduced, the service life of the LED illuminating lamp is prolonged, through the use of the baffle plates 55, the air flow formed by the rotation of the subsequent fan blades 63 can completely pass through the heat radiator 54, the heat radiator 54 can be in full contact with the air flow, and the incomplete contact of the heat radiator 54 can be effectively prevented, the heat dissipation effect of the heat sink 54 is better.

In this embodiment, the heat dissipating assembly 6 is disposed above the heat conducting assembly 5, the heat dissipating assembly 6 includes a motor 61, the motor 61 is fixedly connected to the inner wall of the housing 2, a rotating shaft 62 is fixedly connected to an output shaft of the motor 61, a fan 63 is highly connected to an end of the rotating shaft 62 far away from the motor 61, the motor 61 can drive the rotating shaft 62 to rotate by the operation of the motor 61, and further the fan 63 rotates to dissipate heat from the heat sink 54, so as to accelerate air flow and exhaust hot air rapidly, thereby achieving an effect of accelerating heat dissipation, the rotating shaft 62 penetrates through the first bevel gear 64 and is fixedly connected to the first bevel gear 64, the first bevel gear 64 is engaged with the second bevel gear 65, and when the motor 61 rotates to drive the rotating shaft 62 to rotate, the second bevel gear 65 can rotate, thereby providing power for the rotation of the subsequent disc 68, one end of the second bevel gear 65, which is far away from the first bevel gear 64, is fixedly connected with a rotating rod 66, the rotating rod 66 penetrates through a support rod 67 and is rotatably connected with the support rod 67, one end of the support rod 67, which is far away from the rotating rod 66, is fixedly connected to the inner wall of the shell 2, through the use of the support rod 67, the rotating rod 66 can be limited while being supported by the support rod 67, so that the rotating rod 66 can rotate more stably, and the subsequent heat dissipation work is promoted, one end of the rotating rod 66, which is far away from the second bevel gear 65, is fixedly connected with a disc 68, one side of the disc 68, which is far away from the rotating rod 66, is fixedly connected with a fixed block 69, the fixed block 69 is slidably connected in a sliding groove of the sliding plate 610, the sliding plate 610 is not in contact with the fixed block 69, the fixed block 69 slides in the sliding groove of the sliding plate 610, under the effect of the sliding plate 610, the fixed block 69 can play a limiting and supporting effect on the sliding plate 610, so as to prevent the fixed block 69 from sliding out of the sliding groove of the sliding plate 610, meanwhile, the sliding plate 610 can be prevented from shifting during sliding, a vertical rod 611 is fixedly connected to the outer wall of the sliding plate 610, the vertical rod 611 penetrates through the fixing cavity 612 and is slidably connected with the fixing cavity 612, the fixing cavity 612 is fixedly connected to the inner wall of the housing 2, by using the fixing cavity 612, the vertical rod 611 can be limited, and the vertical rod 611 can be more stable when sliding, when the motor 61 rotates to drive the rotating shaft 62 to rotate, the first bevel gear 64 can be driven to rotate, through the transmission action of the second bevel gear 65, the rotating rod 66 can drive the disc 68 to rotate, thereby driving the fixed block 69 to move on the disc 68, enabling the fixed block 69 to slide in the sliding slot of the sliding plate 610, driving the sliding plate 610 to reciprocate up and down, under the limiting effect of the fixing cavity 612, the vertical rod 611 can reciprocate in the vertical direction, so that the subsequent work of the swing assembly 7 and the anti-blocking assembly 8 is facilitated.

In this embodiment, a swing component 7 and an anti-blocking component 8 are disposed below the heat dissipation component 6, the swing component 7 includes an expansion link 71, one end of the telescopic rod 71 is hinged on the outer wall of the vertical rod 611, the other end of the telescopic rod 71 is fixedly connected with the long plate 73, the telescopic rod 71 is penetrated by the first fixing rod 72 and is rotatably connected with the first fixing rod 72, the telescopic rod 71 is driven to move through the reciprocating motion of the vertical rod 611 in the vertical direction, under the hinging action of the telescopic rod 71 and the vertical rod 611, the telescopic rod 71 can swing and stretch at the same time, under the action of the first fixing rod 72, the long plate 73 can swing up and down to a certain extent, so that the air circulation is further accelerated, the heat dissipation efficiency is increased, meanwhile, the heat conducting pipe 53 can be blown to dissipate heat, so that the temperature of the heat conducting pipe 53 is reduced, and the effect of reducing the temperature of the lighting lamp is achieved.

In this embodiment, the anti-blocking assembly 8 includes a hinged rod 81, one end of the hinged rod 81 is hinged to the outer wall of the vertical rod 611, the other end of the hinged rod 81 is slidably connected to the inner wall of the cylinder 82, the hinged rod 81 is elastically connected to the inner wall of the cylinder 82 through a first spring 83, the cylinder 82 is penetrated by the second fixing rod 84 and is rotatably connected to the second fixing rod 84, when the vertical rod 611 performs reciprocating motion in the vertical direction through the hinged rod 81, the cylinder 82 and the striking rod 85, the hinged rod 81 can slide on the inner wall of the cylinder 82, buffering of acting force is performed under the action of the first spring 83, one end of the cylinder 82, which is far away from the hinged rod 81, is slidably connected to the striking rod 85, the striking rod 85 is elastically connected to the inner wall of the cylinder 82 through a second spring 86, and through the use of the second spring 86, the striking ball 87 can be automatically reset in the subsequent striking process, strike one end fixedly connected with of pole 85 and keeping away from drum 82 and strike ball 87, when montant 611 carries out the reciprocating motion of vertical direction, can drive articulated rod 81 and slide on the inner wall of drum 82, under the effect of second dead lever 84, make and strike ball 87 and can strike filter screen 3, make lamps and lanterns when using, can be with attached to the dust on filter screen 3 can be shaken off, effectively prevent that filter screen 3 from blockking up the problem that leads to influencing the device radiating effect by the dust, guarantee that the device can carry out normal circulation of air at the during operation.

A heat conduction method of an LED high-power lighting lamp comprises the following steps: s1: the LED integrated chip 51 dissipates heat when in operation, and the dissipated heat is upwards conducted to the heat absorbing sheet 52; s2: conducting the heat of step S1 from the heat absorbing sheet 52 to the heat conductive pipe 53; s3: the heat of step S2 is conducted from the heat pipe 53 to the heat sink 54 to be dissipated.

When the LED illuminating lamp works (or is used), the illuminating lamp is lighted and continuously generates heat, in the working process of the illuminating lamp, heat on the LED integrated chip 51 can be absorbed through the heat absorbing sheet 52, meanwhile, the heat is conducted to the heat conducting pipe 53, the heat is conducted to the heat radiator 54 through the heat conducting pipe 53 for heat radiation, the heat of the LED integrated chip 51, the heat absorbing sheet 52 and the heat conducting pipe 53 is reduced, the temperature of the LED integrated chip is reduced, the service life of the LED illuminating lamp is prolonged, meanwhile, the motor 61 works, the motor 61 can drive the rotating shaft 62 to rotate, the fan blades 63 rotate to radiate the heat radiator 54, the air flow is accelerated, hot air is quickly discharged, the heat radiator 54 is quickly radiated, air flow formed by the rotation of the subsequent fan blades 63 can completely pass through the heat radiator 54 through the use of the baffle 55, the heat radiator 54 can be in full contact with the air flow, and the situation that the air flow is not in full contact with the heat radiator 54 is effectively prevented, the heat sink 54 has a better heat dissipation effect, the first bevel gear 64 is driven to rotate by the rotation of the rotating shaft 62, the second bevel gear 65 is driven to rotate under the transmission action of the second bevel gear 65, the rotating rod 66 drives the disc 68 to rotate, and further drives the fixing block 69 to move on the disc 68, so that the fixing block 69 can slide in the chute of the sliding plate 610, and the sliding plate 610 is driven to reciprocate up and down, under the limit action of the fixing cavity 612, the vertical rod 611 can reciprocate in the vertical direction, the telescopic rod 71 is driven to move, under the hinging action of the telescopic rod 71 and the vertical rod 611, the telescopic rod 71 can swing and can further extend, under the action of the first fixing rod 72, the long plate 73 can swing up and down to a certain extent, the air circulation is further accelerated, the heat dissipation efficiency is increased, and the heat dissipation effect of the heat conducting component 5 and the lighting lamp is further improved, simultaneously can blow the heat dissipation to heat pipe 53, reduce heat pipe 53's temperature, thereby realize the effect that reduces illumination lamps and lanterns temperature, montant 611 can carry out vertical direction reciprocating motion simultaneously, can drive hinge bar 81 and slide on the inner wall of drum 82, under the effect of second dead lever 84, make and beat ball 87 and can beat filter screen 3, make lamps and lanterns when using, can be shaken the dust that adheres to on filter screen 3 off, effectively prevent filter screen 3 by the possibility of dust jam, make the device at the during operation, can carry out normal circulation of air and heat dissipation, the life of extension illumination lamps and lanterns.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a high-power illumination lamps and lanterns heat-transfer device of LED, includes turriform lamp holder (1), its characterized in that: below fixedly connected with casing (2) of turriform lamp holder (1), be provided with filter screen (3) on the lateral wall of casing (2), the inside fixed mounting of casing (2) has lamp shade (4), the inside of casing (2) is provided with heat-conducting component (5), the top of heat-conducting component (5) is provided with radiator unit (6), the below of radiator unit (6) is provided with swing subassembly (7) and prevents stifled subassembly (8).

2. The heat conducting device of the LED high-power lighting fixture as claimed in claim 1, wherein: the heat conduction assembly (5) comprises an LED integrated chip (51), the LED integrated chip (51) is installed inside the shell (2), a heat absorption sheet (52) is installed on the upper side of the LED integrated chip (51), a heat conduction pipe (53) is installed at one end, far away from the LED integrated chip (51), of the heat absorption sheet (52), a heat radiator (54) is installed at one end, far away from the heat absorption sheet (52), of the heat conduction pipe (53), and baffles (55) are arranged on two sides of the heat radiator (54).

3. The heat conducting device of the LED high-power lighting fixture as claimed in claim 1, wherein: radiator unit (6) include motor (61), and motor (61) fixed connection is on the inner wall of casing (2), fixedly connected with pivot (62) on the output shaft of motor (61), the one end highly connected with flabellum (63) that motor (61) were kept away from in pivot (62).

4. The heat conducting device of claim 3, wherein the heat conducting device comprises: the utility model discloses a motor, including pivot (62), first bevel gear (64) and first bevel gear (64), first bevel gear (64) meshing has second bevel gear (65), one end fixedly connected with bull stick (66) of first bevel gear (64) are kept away from in second bevel gear (65), bull stick (66) run through bracing piece (67) and rotate with bracing piece (67) and be connected, the one end fixed connection that bull stick (66) were kept away from in bracing piece (67) is on the inner wall of casing (2).

5. The heat conducting device of the LED high-power lighting fixture as claimed in claim 4, wherein: one end fixedly connected with disc (68) of second bevel gear (65) is kept away from in bull stick (66), one side fixedly connected with fixed block (69) of bull stick (66) are kept away from in disc (68), fixed block (69) sliding connection is in the spout of slide (610), fixedly connected with montant (611) on the outer wall of slide (610), montant (611) run through fixed chamber (612) and with fixed chamber (612) sliding connection.

6. The heat conducting device of claim 5, wherein the heat conducting layer comprises at least one of the following materials: swing subassembly (7) include telescopic link (71), and the one end of telescopic link (71) articulates on the outer wall of montant (611), the other end fixedly connected with long board (73) of telescopic link (71), telescopic link (71) are run through by first dead lever (72) and are connected with first dead lever (72) rotation.

7. The heat conducting device of claim 5, wherein the heat conducting layer comprises at least one of the following materials: prevent stifled subassembly (8) including articulated rod (81), and the one end of articulated rod (81) articulates on the outer wall of montant (611), the other end sliding connection of articulated rod (81) is on the inner wall of drum (82), articulated rod (81) passes through first spring (83) elastic connection with the inner wall of drum (82), drum (82) are run through by second dead lever (84) and are connected with second dead lever (84) rotation.

8. The heat conducting device of claim 7, wherein the heat conducting layer comprises at least one of: one end, far away from the hinged rod (81), of the cylinder (82) is connected with a knocking rod (85) in a sliding mode, the knocking rod (85) is elastically connected with the inner wall of the cylinder (82) through a second spring (86), and one end, far away from the cylinder (82), of the knocking rod (85) is fixedly connected with a knocking ball (87).

9. A heat conduction method of an LED high-power lighting lamp is characterized by comprising the following steps:

s1: the LED integrated chip (51) dissipates heat when working, and the dissipated heat is upwards conducted to the heat absorbing sheet (52);

s2: conducting the heat of the step S1 from the heat absorbing sheet (52) to the heat conducting pipe (53);

s3: the heat of step S2 is conducted from the heat pipe 53 to the heat sink 54 to dissipate the heat.