JPH0251888A - Induction heating cooking utensil - Google Patents

Abstract

PURPOSE:To improve the flow of air in an induction heating cooking utensil, especially, at the corner sections thereof to increase the cooling efficiency by arranging the blades of the first and the second cooling fins positioned at the external circumference of an air inlet fan such that the blades are in parallel with the front wall face of a casing. CONSTITUTION:An air inlet 24 and an air inlet fan 34 are arranged on the base of a casing 23 so that sucked air tends to flow upward along the surroundings, but as there are heating coils and a roof at the upper portion, air flows toward an air outlet 28. There are air outlets 28 on the side wall at one long side of an approx. rectangular base, and the first and the second cooling fins 25 and 26 are arranged at both sides of the air inlet fan 34 adjacently to the side wall face at the opposite side to the above side wall, and as the blades of the cooling fins 25 and 26 are almost in parallel with that side wall face, the cooling fins 25 and 26 lead the flow of such air to a corner portion at the air inlet side of both sides in the casing. The air flow led to the corner portion is bent and advances to the air outlet side and discharged from the air outlet 28. Resultantly, there is no stagnation of a wind at the corner positions at both sides in the casing so that the casing can be uniformly cooled.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an induction heating cooker, and more particularly to a cooling structure for internal parts thereof.

2. Description of the Related Art An example of a conventional induction heating cooker of this type is shown in FIG.
This will be explained using a built-in induction heating cooker. As shown in the figure, an intake fan 3a is located in the center of the external housing 1 in the vicinity of the intake port 2, and an exhaust fan 3a is located in the vicinity of the exhaust port 4.
b, a partition plate 5 is arranged around the intake fan 73&, and a cooling fin 6a of a semiconductor switching element that drives the first and second heating coils, respectively, is provided in the center.

6b, and printed circuit boards 7a and yb of a control circuit for driving the semiconductor switching elements were disposed close to both side walls of the housing. Further, as shown in FIG. 8, an intake port 2 and an intake fan 3 are provided in a part of the corner opposite to the exhaust port 4 of the external housing 1, and semiconductor switching elements are provided to drive the first and second heating coils, respectively. The cooling fins SA, EB are attached to each wall surface of the corner portion of the cooling fins 6&.

The printed circuit boards 7a and 7b of the control circuit are provided close to the intake port 2 so that the blades 6b are parallel to each other, and the printed circuit boards 7a and 7b of the control circuit are fixed to the side wall and front wall surface opposite to the intake port 2, as shown in the figure. there were.

In addition, the conventional induction heating cooker No. 40 has an exhaust port 9 provided at the bottom of the power unit, that is, the chassis 8, as shown in Figure 9, and an exhaust fan 1 in the vicinity of the exhaust port 9.
cooling fins 13.1 that cool the semiconductor switching element 11 that drives the first heating coil and the semiconductor switching element 12 that drives the second heating coil;
4 are arranged side by side on one intake port side of the chassis 8,
Printed circuit boards 15 and 16 of control circuits that respectively drive the semiconductor switching elements 11 and 12 are mounted on the chassis 8.
It was placed close to the vertical side plate of the As shown in FIG. 10, these power units 17a and 17b are arranged on the exhaust duct 19 on the bottom of the housing 18, and air intake ports 20a and 20 are provided on both sides of the rear part of the housing.
Air is taken in from the exhaust fans 22a and 22b through the exhaust ports 9a and 9b of the power units 17a and 17b.
The air is exhausted from the air through an exhaust duct 19 and from an exhaust passage 21 in the outer casing.

Problems to be Solved by the Invention In such a conventional configuration, in the case of the induction heating cooker shown in Fig. 7, the intake air is concentrated in the central part, as shown by the arrows in the figure showing the flow of cooling air. The flow of air is poor near the printed circuit boards 7a and 7b on both sides of the housing 1.
Cooling effect is not uniform inside the case. Therefore, the cooling efficiency is poor, and reliability may be impaired due to insufficient cooling of the electronic components.

In the case of the induction heating cooker shown in FIG. 8, the intake port 2 is the exhaust port 4.
Since it is located at one corner on the opposite side of
, 7b, where the printed circuit board is located, the airflow is poor in a part of the corner, so there is a problem that the cooling efficiency in this part is poor.

In addition, in the case of the 40 built-in induction heating cookers shown in Fig. 9 and Fig. 1o, the flow of cooling air is indicated by arrows in the figures, but since the heating coil unit is fixed above the power unit, Most of the inhaled air is the power unit)1
The air is sucked in near the chassis openings 7a and 17b, and there is almost no air flow in the front of the housing 18, resulting in poor cooling efficiency at the front of the main body. The problem was that it was difficult to place electronic components on the front of the main body. In addition, in the configuration of the power unit shown in FIG. 9, the cooling fins 14 are located on the leeward side of the cooling fins 13, and when the temperature of the cooling fins 13 increases, the cooling conditions for the cooling fins 14 become very poor, and the cooling fan 10 is still not working. Since it is an exhaust fan, the air flow inside the power unit is weak, and the cooling effect in the center is particularly poor.

The present invention is intended to solve these problems, and its first purpose is to improve the air flow inside the induction heating cooker, particularly in the corners, and to improve the cooling efficiency.

The second purpose is to uniformly cool the top of the power unit on which the high-frequency power converter of the induction heating cooker is mounted, and to cool the front part of the main body housing in which a plurality of the power units are installed. The purpose is to improve the flow of air and make it easier to install heat generating parts and electronic components at the front of the main body.

Means for Solving the Problems and In order to achieve the above first object, the first aspect of the present invention is as follows.
The technical means includes: a casing with an I8 rectangular bottom in which a high-frequency power converter is placed; an exhaust port provided on the rear wall of the casing; and an intake port provided in the front of the bottom of the casing. , an intake fan that blows cooling air from the intake port around the intake port, and first and second cooling fins located on the outer periphery of the intake fan and having blades, the first and second cooling fins having blades. The blades of the cooling fins are self-installed so as to be substantially parallel to the front wall surface of the housing.

In order to achieve the second object, the present invention also provides: - a main body housing having an exhaust port provided on one side of the picture wall; and a high-frequency power converter located inside the housing. This chassis is provided with first and second cooling fins having blades, and an air intake port facing the intake port of the casing is provided on the bottom surface of the chassis 7. An intake fan disposed nearby is provided, and if 1st. The blades of the second cooling fins are arranged so that the air from the intake port is rectified substantially parallel to the long sides of the chassis, and the first and second cooling fins are provided with wind direction plates perpendicular to the short sides of the chassis, respectively. A second power unit is provided, and the first and second power units are arranged in a housing so that the wind direction partition plates are adjacent to each other, and the exhaust port of the housing faces the long side of the chassis of one power unit. It is set so that it is biased.

For production The effect of the first means of the present invention is as follows.

The intake port and intake fan are located at the bottom of the case, and the intake air tries to flow upward and around, but since there is a heating coil and a top plate above, it flows toward the exhaust port. It flows. There is an exhaust port on one long side wall of the substantially rectangular bottom surface, and first and second cooling fins are arranged on both sides of the intake fan near the opposite side wall surface, and the blades of the cooling fins are as follows. Since the cooling fins are substantially parallel to the side wall surfaces, the cooling fins serve to guide the flow of the intake air to a portion of both intake side corners inside the housing. The air guided to the corner is bent, directed toward the exhaust port, and is discharged from the exhaust port. Therefore, air stagnation at some of the corners on both sides inside the housing is eliminated, and the housing can be uniformly cooled, making it easier to arrange electronic components and heat-generating components that are easily affected by heat on both sides.

The effect of the second means is as follows.

The air taken in by the intake fans of the first and second power units tries to flow upward and around, but the short sides of the chassis of the first and second power units, which are arranged on the bottom of the housing and whose bottom surfaces are approximately rectangular, There is a vertical wind direction plate on the side, and this vertical wind direction plate of the power unit plays the role of partitioning the center of the case, and an exhaust port is provided on the side wall of the case on the side of the sword ejection port. Since there are heating coils and a top plate above, the air flow is from the intake port of the first power unit, which is located far from the exhaust port, to the front of the casing, and then to a location close to the exhaust port. A large air flow path is formed from the intake port to the exhaust port of the second power unit, and there are almost no places where air stagnates, making uniform and efficient cooling possible. Therefore, heat-generating components and semiconductor components with low heat resistance can also be disposed on the front surface.

In addition, the chassis of each power unit has blades,
Since the first and second cooling fins are arranged on the windward side across the intake port, the cooling fins direct a part of the intake air to the windward side of the power unit. By directing the air toward the corners, there is no air stagnation inside each power unit, and a uniform cooling effect can be obtained.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to the drawings.

In FIG. 1, reference numeral 23 denotes a housing with a rectangular bottom surface on which electrical components are placed, and an intake port 24 and an intake fan 34 are provided on the bottom surface of the body 23 toward the front from the center thereof.

On both sides of the intake port 24, cooling fins 25 and 28, which are semiconductor switching elements that drive the first heating coil zlz27a and the second heating coil indicated by dotted lines, are similarly arranged toward the front from the center of the housing 23. A printed circuit board 29 on which electric circuit components of a 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 board 31 of the high frequency power converter is installed along the wall surface located on the short side of the rectangular bottom surface of the housing 23.
．． 32 is fixed, and a filter coil 33a and power transformers 7 and 33b are provided between the cooling fins 26 and the control circuit board 320 on the second heating coil 27b side. Further, 36° 36 is an intake duct, and 37 is an exhaust duct. FIG. 2 shows a perspective view of FIG. 1 assembled into a cabinet 38. The first heating coil 7 is placed on the top plate 41.
Heating ports 39 and 40 corresponding to 1/27a and 27b are marked and controlled in a circular shape, and the intake ducts 36, 36,
A grille cover 42 is placed on the exhaust duct 3γ.

In the above configuration, the indoor air outside the cabinet 38 is guided into the gear vignette 38 through the intake duct 35, 36 through the lattice-shaped gap in the cover 42, and the air inside the cabinet 38 is guided into the gear vignette 38 through the lattice-shaped gap in the cover 42. The air flows into the housing from the intake port 24 of the pregnant section by the intake fan 34, and this air approaches the wall surface on the opposite side from the exhaust port 28.
Further, the blades are rectified and sent to both sides of the short side of the housing 23 by two cooling fins 25 and 26 arranged substantially parallel to this wall surface, and the control board 31. 32 and Hui/Retakoi/l/33a.

The cooled power transformer 33b is discharged from the exhaust port 28, through the exhaust duct 37, and through the lattice-shaped gap in the grill cover 42 shown in FIG. 2 to the outside. That is, in this embodiment, the heat dissipating fins 25 and 28 having blades are used to control the flow of air that is taken in by the intake port 24 and the intake fan 34 and is about to flow to the exhaust port 28 on the opposite side of the housing 23. of,
Since the air is rectified and guided to both sides of the intake port side, it is possible to eliminate air stagnation at a part of the intake port side corner of the housing 23 or along the walls on both sides. Therefore, it is possible to uniformly cool the control boards 31, 32, the filter coil 33a, and the transformer 33b, which are heat generating components.

A second embodiment will be described with reference to FIGS. 3 to 6. In FIG. 3, parts with the same numbers as those in FIG. 1 correspond to each other, and their explanations will be omitted. In the first embodiment, the components were arranged in the main body casing, but in FIG. Some parts are vertically located along the Same as this in Figure 4.
Place the 10th power unit 46a of the housing 46 so that the intake port 24a is on the rear wall side of the housing 46, and the second power unit 45b so that the intake port 24b is on the opposite side of the rear wall of the housing 46. They are each fixed on the bottom surface of the casing 46 by inverting them at an angle of 18σ. In the figure, a power unit 45 is provided on the bottom of the housing 46.
Inlet ports 8 and 45b are provided near the intake ports 24a and 24b, and at the rear, exhaust ports 50 (plurality) are provided facing the exhaust passage 49 formed by the rear duct cover 47 and the partition plate 48.
is installed. An intake passage 52 is formed by the attached cutting plate 48, the partition plate 51, the rear duct cover 47, and the housing 46, and the exhaust passage 49 and the intake passage 62 are covered by a grill cover 53 having a grid-like gap. 54 is a power transformer for the control circuit of the touch control unit 66 shown in FIG. 6, and 57 is a choke transformer for noise prevention.

FIG. 5 shows an example in which a top plate 57, a touch control unit 66, and a grill cover 63 are attached to the casing 46 of FIG. 4 and assembled into a cabinet 68.

In the above configuration, as in the case of the first embodiment, the air outside the cabinet 58 is guIJ/Reka, t<-63
The air inside the cabinet 58 is guided into the cabinet 58 through the intake duct 52 through the lattice-shaped gap, and the air inside the cabinet 58 is passed through the intake port at the bottom of the housing 46 and the power unit 4sa,
Intake fan 34a from intake port 24& of 45b, 24b
, s4b into the housing. This air tries to flow around and above the intake ports 24a and 24b, but there are heating coils and a top plate above, there is no exhaust port behind the first power unit 45a, and the second power unit 46b There are exhaust ports 5Q- and 1 behind the
ijJ m circuit board 32a, 32b, 31a, 32
b are vertically fixed on both sides of the first and second sides and play the role of wind direction plates, so that the airflow flows as shown in FIG.

That is, the air flowing in from the intake port 24a of the first power unit flows to the front of the housing 46, then flows laterally through the front part of the housing, and then flows into the second power unit 45b. This air flow, together with the air taken in from the intake port 24b of the second power unit 45b, flows to the exhaust port SO and is discharged. In addition, for the above-mentioned air flow, the intake ports 24a, 24b of each power unit 4sa, 46b
First and second cooling fins 25a, 26a are sandwiched between the first and second cooling fins 25a, 26a.

25b and 26b are arranged on the windward side of the chassis 43a and 43b, and the blades of the cooling fins are arranged on the windward side of the chassis 43a and 43b.
Since the cooling fins are substantially parallel to the long sides of the cooling fins 43a and 43b, the cooling fins rectify a part of the air flow from the intake port in a direction perpendicular to the wind flow. Therefore, there is no air stagnation on each power unit 7), and the components on each chassis are uniformly cooled. As described above, in the above configuration, each power unit 2)
The components on the 7-board are efficiently cooled, and the choke coil 64, touch control unit 56, and its power transformer 5 disposed on the side of the housing 46 are
5 and other heat-generating components and electronic components can be easily cooled.

In the second embodiment, the wind direction plates 44a and 44b are arranged near the fans in order to make the above-mentioned air flow more effective, but these may be omitted. Furthermore, on the husband's side, since two identical power units are arranged side by side, assembly and serviceability are excellent.

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

(1) A cooling fin having first and second blades is close to a wall surface located on the opposite side of the housing wall surface having the exhaust port, and the blades of the cooling fin are approximately parallel to the wall surface, and the blades of the cooling fin are located on both sides of the intake fan. Since the intake air is guided to both side corners of the case opposite to the exhaust port, the air flow capacity in the corners and both sides of the case can be improved.
Improves cooling efficiency of electronic components.

(2) The air sucked in by the intake port and intake fan located on the bottom of the chassis is rectified by the vertical wind direction plates on both sides of the power unit, and is exhausted from the exhaust port located on one side of the rear wall. This allows air to flow in one direction through the housing, making it possible to cool the front side of the housing.In addition, inside each power unit 7, which has a roughly rectangular bottom shape, there is a long windward side. Since the first and second cooling fins of each power unit are provided on the sides so that their blades are approximately parallel to the long sides, a portion of the airflow flowing into the housing is directed upwind of each power unit. The air is rectified left and right by the cooling fins, and the vertical I on both sides located on the short side
Since it hits the wind direction plate of M, the cooling within each power unit 7 is made uniform, and as a result, the size and rotation speed of the cooling fan can be reduced, and the cost is also reduced. Since the temperature of electronic components also decreases, reliability also improves.

[Brief explanation of the drawing]

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 when it is assembled into a gear vignette, and Fig. 3 is an internal plan view of an induction heating cooker showing an embodiment of the present invention. FIG. 4 is an internal exploded perspective view of the induction cooking device; FIG. 6 is an external perspective view of the induction cooking device when it is installed in a cabinet; Fig. 6 is an explanatory diagram of the operation of Fig. 4, Figs. 7 and 8 are internal plan views showing the conventional example, Fig. 9 is an internal plan view of the power unit showing the conventional example, and Fig. 10 shows the conventional example. It is an exploded perspective view. 23... Housing, 24...-Intake port, 25...
...First cooling fin, 26... Second cooling fin, 31a. 31 b, 32a, 32b...Wind direction plate, 3
4...Intake fan, 43a, 43b...
-・Chassis, 45a. 45b...power unit, 46...book K
W body. Name of agent: Patent attorney Shigetaka Awano and one other figure! 4cL, 24b ---"'mouth 50・-1s1maE口Fig.

Claims (2)

[Claims] (1) A casing with a substantially rectangular bottom in which a high-frequency power converter is placed, an exhaust port provided on the rear wall of the bottom of the casing, an intake port provided on the front side of the bottom of the casing, and an intake port provided on the front side of the bottom of the casing. An intake fan that blows air from the mouth around the intake port, and first and second cooling fins that are located on the outer periphery of the intake fan and have blades; The blades of this induction heating cooker are arranged so that they are approximately parallel to the front wall of the housing. (2) comprising a main body casing having an exhaust port provided on one side of one side wall surface, and a chassis having a substantially rectangular bottom shape located within the casing and on which a high frequency power converter is placed; The chassis is provided with first and second cooling fins having blades, and is also provided with an intake port facing the intake port of the casing on the bottom surface of the chassis and an intake fan disposed in the vicinity thereof. 1. A first cooling fin, in which the blades of the second cooling fin are arranged so that the air from the intake port is approximately parallel to the long side of the chassis, and a wind direction plate is provided perpendicular to the bottom surface of the chassis located on the short side of the chassis. and a second power unit, wherein the first and second power units are arranged such that the wind direction partition plates are adjacent to each other in the housing, and the exhaust port of the housing is connected to the long side of the chassis of one power unit. Induction heating cooker installed skewed so as to face each other.