JP2890415B2 - Induction heating cooker - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an induction heating cooker, and more particularly to a cooling structure for internal components thereof.

2. Description of the Related Art An example of a conventional induction heating cooker of this type will be described with reference to a two-port built-in induction heating cooker shown in FIG. As shown in the figure, an intake fan 3a is provided near the intake port 2 in the center of the outer casing 1, and an exhaust fan 3b is provided near the exhaust port 4.
Is provided, a partition plate 5 is provided around the intake fan 3a, and cooling fins 6a and 6b of semiconductor switching elements that respectively drive the first and second heating coils are provided in the center.
Further, the printed circuit boards 7a and 7b of the control circuit for driving the semiconductor switching elements are close to both side wall surfaces of the housing,
Had been arranged. Further, as shown in FIG. 8, an intake port 2 and an intake fan 3 are provided at a corner opposite to the exhaust port 4 of the external housing 1 to cool the semiconductor switching elements that drive the first and second heating coils, respectively. Fins 6a and 6b are provided near the intake port 2 so that the blades of the cooling fins 6a and 6b are parallel to the respective wall surfaces of the corners. It was fixed to the side wall opposite to the mouth 2 and the front wall surface.

The conventional four-port induction heating cooker has a power unit as shown in FIG. 9, that is, an exhaust port 9 provided on the bottom surface of the chassis 8, and an exhaust fan close to the exhaust port 9.
The cooling fins 13 and 14 for cooling the semiconductor switching element 11 for driving the first heating coil and the semiconductor switching element 12 for driving the second heating coil are provided on one intake port side of the chassis 8. The printed circuit boards 15 and 16 of the control circuit which are arranged side by side and drive the semiconductor switching elements 11 and 12 respectively are arranged close to the vertically standing side plate of the chassis 8. This power unit 17a,
As shown in FIG. 10, 17b is disposed on an exhaust duct 19 on the bottom surface of the casing 18, and exhaust fans 22a, 22b that take in air from intake ports 20a, 20b provided on both sides at the rear of the casing 18. Through the exhaust ducts 9a and 9b of the power units 17a and 17b.
The air was exhausted from the exhaust passage 21 of the external housing through the exhaust passage 19.

In such a conventional configuration, in the case of the induction heating cooker shown in FIG. 7, the drawn air is concentrated in the central portion as shown by the flow of the cooling air by the arrow in FIG. The air flow near the printed circuit boards 7a and 7b on both sides of the housing 1 is poor, and the cooling action is not uniform inside the housing. Therefore, the cooling efficiency is poor, and the reliability may be impaired due to insufficient cooling of the electronic components. In the case of the induction heating cooker shown in FIG. 8, since the intake port 2 is located on one side of the corner opposite to the exhaust port 4, the distance to the other corner is long, and the vicinity of the other corner, that is, FIG. And 7b, there is a problem that the air flow at the corner where the printed circuit board is located is deteriorated, so that the cooling efficiency of this portion is deteriorated.

In the case of the four-port built-in induction heating cooker shown in FIGS. 9 and 10, the flow of the cooling air is indicated by an arrow in the figure, but since the heating coil unit is fixed above the power unit, The majority of the inhaled air is
The air is sucked in near the opening of the chassis a and 17b, and there is almost no air flow in the front of the housing 18, and therefore the cooling efficiency of the front of the main body deteriorates. There is a problem that it is difficult to dispose electronic components at the front part of the main body. In addition, in the configuration of the power unit shown in FIG.
14 and the cooling fins 13
Since the cooling condition of 14 became very bad, and the cooling fins 10 were exhaust fans, there was also a problem that the air flow inside the power unit was weak, and especially the cooling effect at the center was poor.

SUMMARY OF THE INVENTION The present invention solves such a problem, and a first object of the present invention is to improve the flow of air inside an induction heating cooker, particularly at the corners, to improve cooling efficiency.

A second object is to uniformize the cooling on the power unit on which the high-frequency power converter of the induction heating cooker is mounted, and to reduce the cooling wind at the front of the main body housing in which a plurality of the power units are incorporated. An object of the present invention is to improve the flow and make it easier to dispose a heat generating part and electronic components in the front part of the main body.

Means for Solving the Problems In order to achieve the first object, a first technical means of the present invention comprises a housing on which a high-frequency power conversion device is mounted, and a rear wall surface on the bottom surface of the housing. An exhaust port provided, an intake port provided on the front side of the bottom surface of the housing, an intake fan for blowing air from the intake port to around the intake port, and first and second cooling fins having blades. The first and second cooling fins are arranged on both sides of the intake fan along the front wall of the housing, and the first and second cooling fins are
The blades of the cooling fin are arranged so as to be substantially parallel to the front wall surface of the housing.

Further, in order to achieve the second object, the present invention provides a main body housing having an exhaust port provided so as to be bent on one side of one side wall surface, and a high-frequency power conversion device mounted in the housing. A chassis having a substantially rectangular bottom surface is provided, and this chassis is provided with first and second cooling fins having blades, and at the intake port facing the intake port of the housing on the bottom surface of the chassis and the vicinity thereof. An air supply fan, and the blades of the first and second cooling fins are arranged so that wind from the air inlet rectifies the air substantially in parallel to a long side of the chassis. First and second power units each having a vertical wind direction plate provided on a short side thereof are provided.
The second power unit is provided such that the wind direction partition plate is disposed adjacent to the inside of the housing, and the exhaust port of the housing is biased so as to face the long side of the chassis of one power unit. .

Operation The operation of the first means of the present invention is as follows. An intake port and an intake fan are arranged on the bottom of the housing, and the intake air tries to flow upward and around, but since there is a heating coil and a top plate above, Flows. There is an exhaust port on one side wall on the bottom of the housing,
First and second cooling fins are arranged on both sides of the intake fan in the vicinity of the opposite side wall surface, and the blades of the cooling fin are substantially parallel to the side wall surface, so that the cooling fin is sucked. It serves to guide the flow of the air that has flowed into the corners on the intake side on both sides inside the housing. The air guided to the corners is bent and discharged toward the exhaust port side from the exhaust port. Therefore, there is no wind stagnation at both corners inside the housing,
Since the housing can be uniformly cooled, electronic components and heat-generating components that are easily affected by heat can be easily arranged on both sides.

The operation of the second means is as follows. The air sucked from the intake fans of the first and second power units tends to flow upward and around, but the short sides of the chassis of the first and second power units whose bottoms arranged on the housing bottom are substantially rectangular. There is a vertical wind direction plate on the side, and the central unit of the housing is served by the vertical wind direction plate of this power unit,
Further, an exhaust port is provided on one side of the exhaust port side wall surface of the housing, and a heating coil and a top plate are provided above, so that the flow of air is located far from the exhaust port. A large air flow path is formed from the inlet of the first power unit → the front of the housing → the inlet of the second power unit placed at a position close to the outlet → the outlet of the second power unit. And efficient cooling becomes possible. Therefore, a heat-generating component and a semiconductor component having low heat resistance can also be provided on the front surface.

In addition, the first and second cooling fins having blades are arranged eccentrically to the windward side with the intake port interposed therebetween in the chassis of each power unit. Are guided toward the windward corner of the power unit, and the wind does not stay in each power unit, so that a uniform cooling effect can be obtained.

Embodiment Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

In FIG. 1, reference numeral 23 denotes a casing having a rectangular bottom surface on which electric components are placed. An intake port 24 and an intake fan 34 are provided on a bottom portion of the casing 23 closer to the front from the center. Air intake
Similarly, cooling fins 25 and 26 of semiconductor switching elements for driving the first heating coil 27a and the second heating coil 27b indicated by wavy lines are provided on both sides of the front side from the center of the housing 23. A printed circuit board 29 on which electric circuit components of the high-frequency power converter are mounted is disposed on the exhaust port 28 side. 30 is a cooling fin of the power rectifier. The control circuit boards 31 and 32 of the high-frequency power converter are fixed along the wall surface located on the short side of the rectangular bottom surface of the housing 23, and the filter coil 33a and the power transformer are provided on the second heating coil 27b side.
33b is provided between the cooling fin 26 and the control circuit board 32. 35 and 36 are intake ducts, and 37 is an exhaust duct. FIG. 2 is a perspective view in which FIG. 1 is incorporated in a cabinet 38. On the top plate 41, the first and second heating coils
Heating ports 39 and 40 corresponding to 27a and 27b are printed in a circular shape, and a grill cover 42 is placed on the intake ducts 35 and 36 and the exhaust duct 37.

In the above configuration, the air in the room outside the cabinet 38 is supplied from the lattice-shaped gap of the grill cover 42 to the intake duct 3.
After passing through 5, 36, the air is guided to the inside of the cabinet 38, and the air inside the cabinet 38 flows into the inside of the housing from the intake port 24 at the bottom of the housing 23 by the intake fan 34, and this air is
It is rectified and sent to both sides of the short side of the housing 23 by two cooling fins 25 and 26 which are arranged near the wall opposite to the wall 28 and the blades are arranged substantially in parallel with this wall. Control boards 31 and 32 and a filter coil 33
a, The power transformer 33b is cooled, and is discharged from the exhaust port 28 through the exhaust duct 37 to the outside through the lattice-shaped clearance of the grill cover 42 shown in FIG. That is, in this embodiment, the radiation fins 25 and 26 having the blades are taken in by the intake port 24 and the intake fan 34, and are exhausted by the exhaust port 28 on the opposite side of the housing 23.
Since the flow of the air that is about to flow toward the intake port is rectified and guided to both sides on the intake port side, it is possible to eliminate the stagnation of the air at the corner section on the intake port side of the housing 23 or on the wall wall on both sides. Accordingly, it is possible to uniformly cool the control boards 31, 32, the filter coil 33a, which is a heat-generating component, and the power transformer 33b.

A second embodiment will be described with reference to FIGS.
In FIG. 3, components denoted by the same reference numerals as those in FIG. 1 correspond to each other, and a description thereof will be omitted. In the first embodiment, the components are arranged in the main body housing. However, in FIG. 3, the components are fixed on a chassis 43 made of resin. Are provided partially vertically. In FIG. 4, a first power unit 45a having the same structure as that of FIG.
On the bottom surface of the housing 46 by inverting each at an angle of approximately 180 ° so that the air inlet 24b is on the opposite side of the rear wall surface of the housing 46,
Fixed. In the figure, on the bottom surface of the housing 46,
An intake port is provided in the vicinity of the intake ports 24a, 24b of the power units 45a, 45b, and an exhaust port 50 (plural) is arranged at a rear portion facing an exhaust passage 49 formed by a rear duct cover 47 and a partition plate 48. Has been established. Partition plate 48, partition plate 51 and rear duct cover
47 and a housing 46, an intake passage 52 is formed, and a grill cover 53 having a lattice-shaped clearance forms the exhaust passage 49, the intake passage.
Covers 52. 54 is a power supply transformer for the control circuit of the touch control unit 56 shown in FIG. 5, and 57 is a choke transformer for preventing noise. In FIG. 5, a top plate 57, a touch control unit 56, and a grill cover are attached to the housing 46 of FIG.
An example in which 53 is mounted and incorporated in a cabinet 58 is shown.

In the above configuration, as in the case of the first embodiment, the air outside the cabinet 58 is guided from the lattice-shaped gap of the grill cover 53 to the inside of the cabinet 58 through the intake duct 52, and the air inside the cabinet 58 is The air flows into the housing from the air inlet at the bottom of the housing 46 and the air inlets 24a and 24b of the power units 45a and 45b by the air intake fans 34a and 34b. This air tends to flow around and above the intake ports 24a and 24b, but there is a heating coil and a top plate above, there is no exhaust port behind the first power unit 45a, and the second power unit 4
There is an exhaust port 50 behind 5b, and furthermore, control circuit boards 32a,
32b, 31a, 32b are vertically fixed to the first and second sides and serve as wind direction plates, so that the air flow flows as shown in FIG. That is, the air that has flowed in from the air inlet 24a of the first power unit flows in front of the housing 46, then flows laterally in the front portion of the housing, and then flows in the second power unit 45b.
Flow into This air flow is supplied to the second power unit 45b
Flows to the exhaust port 50 together with the air sucked in from the intake port 24b, and is discharged. Further, with respect to the above-described air flow, the first flow is placed across the intake ports 24a, 24b of the power units 45a, 45b.
And the second cooling fins 25a, 26a, 25b, 26b
3b, the blades of the cooling fins are substantially parallel to the long sides of the chassis 43a, 43b. Commutation in the direction perpendicular to Therefore, there is no stagnation of air on each power unit, and the components on each chassis are uniformly cooled. As described above, in the above-described configuration, components on the chassis of each power unit are efficiently cooled, and heat-generating components such as the choke coil 54 and the touch control unit 56 and the power transformer 55 thereof disposed in front of the housing 46, Cooling of electronic components is facilitated.

In the second embodiment, the wind direction plates 44a and 44b are arranged near the fan in order to make the flow of the air more effective, but this is not essential. Further, in this embodiment, since two identical power units are arranged, the assembling and serviceability are excellent.

Effects of the Invention As is clear from the above description of the embodiments, the present invention has the following effects.

(1) The cooling fins having the first and second blades are close to the wall surface located on the opposite side of the housing wall surface having the exhaust port, and the blades of the cooling fins are substantially parallel to the wall surface, and both sides of the intake fan. And the wind that has been taken in is guided to both side corners of the housing on the opposite side of the exhaust port, so that the air flow in the corners and on both sides of the housing is improved, and electronic components Cooling efficiency is improved.

(2) The air taken in by the intake port and the intake fan arranged on the bottom surface of the housing is rectified by the vertical wind direction plates on both sides of the power unit, and is exhausted from the exhaust port provided on one side of the rear wall surface. Therefore, air can flow in one direction in the housing, cooling the front side of the housing is also possible, and in each power unit having a substantially rectangular bottom shape, each power unit The first and second cooling fins are provided such that their blades are substantially parallel to the long sides, so that a part of the airflow flowing through the housing is caused by the cooling fins on the windward side of each power unit. Since it is rectified to the left and right and hits the vertical wind direction plates on both sides located on the short side, cooling within each power unit is also uniform, and as a result, the size and rotation speed of the cooling fins are reduced. Reduced It can, together with the cost is cheaper, reliability is improved since the temperature decreases the electronic component.

[Brief description of the drawings]

FIG. 1 is an internal plan view of an induction heating cooker showing one embodiment of the present invention, FIG. 2 is an external perspective view of the induction heating cooker incorporated in a cabinet, and FIG. 3 is another embodiment of the present invention. FIG. 4 is an internal exploded perspective view of the power unit of the induction heating cooker showing the embodiment, FIG. 4 is an exploded perspective view of the inside of the induction heating cooker, FIG. 6 is an operation explanatory view of FIG. 4, FIGS. 7 and 8 are internal plan views showing a conventional example, FIG. 9 is an internal plan view of a power unit showing a conventional example, and FIG. 10 shows a conventional example. It is an exploded perspective view. 23 ... housing, 24 ... air inlet, 25 ... first cooling fin,
26: second cooling fins, 31a, 31b, 32a, 32b ... wind direction plates, 34 ... intake fans, 43a, 43b ... chassis, 45a, 45b
... power unit, 46 ... body housing.

Continuation of the front page (56) References JP-A-63-279593 (JP, A) JP-A-61-68493 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) H05B 6 / 12

Claims (2)

(57) [Claims] A housing on which the high-frequency power converter is mounted; an exhaust port provided on a rear wall surface of the bottom surface of the housing; an air inlet provided on a front side of the bottom surface of the housing; And a first and second cooling fin having vanes, wherein the first and second cooling fins are disposed on both sides of the intake fan along the front wall of the housing. And the blades of the first and second cooling fins are disposed substantially parallel to the front wall of the housing. 2. A main body housing having an exhaust port provided so as to be bent on one side of one side wall surface, and a chassis having a substantially rectangular bottom surface on which the high-frequency power converter is mounted and which is located in the housing. The chassis includes first and second cooling fins having blades, and an intake port facing the intake port of the housing on the bottom surface of the chassis, and an intake fan disposed near the intake port, The blades of the first and second cooling fins are arranged so that the wind from the intake port is substantially parallel to the long side of the chassis, and a wind direction plate is provided on the bottom surface of the chassis located on the short side of the chassis. First and second power units are provided, and the first and second power units are arranged such that wind direction partition plates are adjacent to each other in a housing, and an exhaust port of the housing has a chassis long side of one power unit. I'm facing the side Induction heating cooker provided biased to.