JPH07313350A - Air cooling device for electric appliance - Google Patents

Abstract

PURPOSE:To provide an air cooling device for an electric appliance, which has a favorable cooling efficiency, and the size of which can be made compact. CONSTITUTION:A cooling fan 30 rotates in a space which is formed by a partitioning wall 19 with an approx. C-shape when being seen from the top and which is provided along an opening edge part of a recessed part 18 on a bottom body 10, and a cover 34 which covers the upper opening of the partitioning wall 19. Then, air which is drawn into the cooling fan 30 from a slit on the recessed part 18 is jetted to a heat sink 33 which is located at an air outlet.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air cooling device for electric equipment, and more particularly to an air cooling device such as an electric rice cooker for cooling electronic parts by blowing air onto a heat sink attached to the electronic parts.

[0002]

2. Description of the Related Art Conventionally, as an air-cooling device for electric equipment, for example, in order to forcibly air-cool an electronic component provided on a printed circuit board in an electric rice cooker, a heat sink is attached to the electronic component, and the electronic component is cooled from a slit provided in a housing. The electronic component is cooled by blowing the air sucked by the fan onto the heat sink.

[0003]

However, in the air cooling device according to the conventional example, since the cooling fan does not blow all the air sucked from the slit of the housing to the heat sink, the cooling efficiency is poor and the air cooling device cannot be miniaturized. There is a problem.

In view of the above problems, it is an object of the present invention to provide an air cooling device for electric equipment which has a high cooling efficiency and can be miniaturized.

[0005]

In order to achieve the above-mentioned object, an air-cooling device for electric equipment according to the present invention has a heat sink attached to an electronic component in a housing, and air drawn by a cooling fan from a slit provided in the housing. In an air-cooling device of an electric device for blowing electronic components to cool electronic components, a partition wall having a substantially C-shaped plane that is provided to project on an inner surface of a housing along the periphery of the cooling fan, and a cover that covers an upper opening of the partition wall. A heat sink to which the air sucked by the cooling fan is blown from a slit provided in the housing is provided at the outlet of the space partitioned by.

[0006]

Therefore, according to the present invention, the cooling fan located in the space partitioned by the partition wall and the cover in the housing sucks the air sucked from the slit of the housing into the heat sink. It will be sprayed on and cooled. Therefore, almost all the air sucked by the cooling fan from the slit of the housing is blown to the heat sink to cool the heat sink, so that the cooling efficiency is good and the air cooling device can be miniaturized.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a case where the electric device according to the present invention is applied to an electric rice cooker will be described with reference to the accompanying drawings of FIGS. The electric rice cooker according to the present embodiment generally has a bottom body 1 as shown in FIGS. 1 and 16.
0, the protective frame 40, the inner body 60, the shoulder 70, the lid 80, and the pan 90.

The bottom body 10 has a recess 11 formed on its back surface.
In the shape of a basin with the cord reel unit 20 provided in FIG.
As shown in FIG.
0 for attaching 0, and four bosses 13a, 13b, 13c for supporting the shoulder body 70 at the corners of the surface thereof.
13d is bulging. Further, the bottom body 10 has ribs 14 that support a coil 50, which will be described later, at a predetermined position on the surface thereof.
a, 14b, and 14c are projected, and the boss 13
A drain hole 16 is provided between a and the partition wall 15.

As shown in FIG. 3, in the cord reel unit 20, an electric cord 21 can be put in and taken out via a built-in spring force. Then, of the back surface of the bottom body 10,
A pair of positioning projections 17, 17 is provided in the vicinity of the outlet of the cord reel unit 20. Therefore, when the drawn electric cord 21 is stored in the unit 20, the plug 22 is locked between the protrusions 17 and 17 and is positioned at a position where the user can easily draw it out, which is convenient. Further, the positioning projections 17, 1 as described above are provided at predetermined positions on the housing of the electric rice cooker.
If 7 is provided, the cord reel unit 20 can be attached at a desired position while maintaining the usability,
There is an advantage that the degree of freedom in design is increased and one type of cord reel unit 20 can be shared.

In the present embodiment, the case of applying to the electric rice cooker has been described, but the present invention is not limited to this, and an electromagnetic cooker using the cord reel unit 20,
Electric kettle, microwave oven, toaster oven, vacuum cleaner,
Iron, radio, cassette tape recorder, TV,
It may be applied to stereos, gas rice cookers, electric pans, etc. Further, the positioning projection 17 does not necessarily have to have the above-described shape, and may be any shape as long as it can lock the plug 22 of the electric cord 21. For example, a pair of parallel projections and a substantially J-shaped cross section. It may be a protrusion of the above, or it may be formed by attaching a separate member afterwards.

Further, the bottom body 10 is provided with a large number of slits 18a for taking in outside air on the side surface and the bottom surface of the recess 18 having a substantially circular plane formed near the boss 12, and the recess 18 is provided. Plane C along the opening edge of
A letter-shaped partition wall 19 is provided so as to project (FIG. 5). Then, the cooling fan 30 is housed and fixed in the recess 18, and the boss 12 of the bottom body 10 has an electronic component 32 and a heat sink 33.
By fitting and fixing the printed circuit board 31 attached in advance, and then attaching the cover 34 (FIG. 4) to the partition wall 19 of the bottom body 10 to cover the upper opening of the partition wall 19, the air cooling device is completed. . Therefore, the air sucked from the slit 18 a of the recess 18 passes through the cooling fan 30 and is located at the outlet of the air cooling device.
The electronic component 32 is cooled by cooling the fins of the heat sink 33 which are sprayed on the nozzle 3 and arranged in parallel with the blowing direction. The cover 34 is provided with ribs 34a for supporting the coil 50 on its surface. Further, the cooling fan 30 does not necessarily have to be provided on the bottom body 10, and may be provided on the inner surface of the shoulder body 70, for example.
It is not particularly limited.

According to this embodiment, the partition wall 19 covered with the cover 34 has a substantially C-shape in plan view, and the heat sink 33 is arranged at the outlet thereof. For this reason, the air sucked by the cooling fan 30 is not leaked and is all blown to the heat sink 33, which enables efficient cooling. Further, if, for example, a high temperature condenser, a trochoid coil, etc. are provided on the downstream side of the heat sink 33 on the surface of the printed circuit board 31, these can be cooled at the same time, and the cooling efficiency is further improved. is there.

As shown in FIGS. 9 and 10, the protective frame 40 is a bowl-shaped heat-resistant resin molded product, and has supporting arms 41a, 41b, 41c, 41d laterally from the outer surface thereof.
Further, the locking tongue piece 42 is projected, and a through hole 43 for mounting a temperature sensor 52 described later is provided in the side wall in the vicinity of the round end. Further, a hook 44 for locking a lead wire 52a of a temperature sensor 52, which will be described later, extends at the tip of the supporting arm portion 41a.

Further, the protective frame 40 is provided with an annular rib 40b centered on the screw hole 40a at the center of the back surface thereof, and positioning ribs 45 are radially provided around the annular rib 40b. Then, the coil 50 wound concentrically on the back surface of the protective frame 40 via the rib 45 is positioned and bonded with an adhesive, and at the same time, the rib 45 and the rib 40b.
The ferrite 51 bent through the coil is positioned on the coil 50, adhered to the back surface of the protective frame 40 with an adhesive, and the tops of the ribs 45 are heat-melted to prevent the ribs from coming off.

In this embodiment, since the adhesive serves as a cushioning material for the ferrite 51, it is possible to prevent damage due to impact force from the outside. Further, by providing the ribs 45, there is an advantage that the protective frame 40 can be reinforced and the bonding area is increased, so that the strength is further improved.

The rib 45 is not limited to one in which the tip portion is melted by heat and fixed, but a pair of opposed claw portions may be provided so as to be attached in a one-touch manner. You may make it attach by providing a protrusion of a shape. In addition, the back surface of the protective frame 40 and the coil 50
In order to eliminate the step between and, the protrusion may be provided on the back surface of the protective frame 40 at the position where the ferrite 51 is provided. Furthermore, the ferrite 51 itself may be provided with a protrusion that engages with the rib 45.

The protective frame 40 is shown in FIGS.
As shown in FIG. 5, the temperature sensor 52, the coil spring 53, and the sensor stopper 54 are sequentially inserted into the through hole 43 provided in the side wall near the are end, and the sensor stopper 54 is rotated while being pushed, and the sensor stopper 54 is projected on the outer peripheral surface thereof. Of the pair of locking projections 54 a and 54 b provided, the projection 54 a is provided in the protection frame 40.
After abutting on the claw portion 47a of the receiving portion 47 protruding on the outer peripheral surface of the, the sensor stopper 54 is pushed back by the spring force of the coil spring 53, and the pair of protrusions 54a and 54b form the receiving portion 46. And 47 are engaged with the claw portions 46a and 47a and the edge portions 46b and 47b, respectively, and are prevented from coming off. Then, the temperature sensor 52 and the like can be removed by performing the reverse operation to the above.

The slit 54c provided in the sensor stopper 54 is for press-fitting the lead wire 52a, and the lead wire 52 pulled out from the sensor stopper 54.
a is locked by the hook 44 of the protective frame 40, bypasses the base of the boss 13a, and is connected to the printed board 31.

In this embodiment, the temperature sensor 52 is locked by locking the sensor stopper 54 to the receiving portions 46 and 47.
Although the case where the sensor is attached to the protective frame 40 in a detachable manner has been described, the present invention is not necessarily limited to this, and the sensor stopper may be detachably attached by pressing the sensor stopper twice in the axial direction. In addition, the sensor stopper may be pushed between a pair of facing claw portions protruding from the outer peripheral surface of the protective frame 40 and locked with one touch.
Further, a substantially J-shaped locking groove is provided on the cylindrical receiving portion protrudingly provided on the outer peripheral surface of the protective frame, and a projection provided on the outer peripheral surface of the sensor stopper is slidably engaged with this locking groove, You may prevent it from slipping out. Then, a temperature sensor may be screwed onto a female screw provided on the protective frame so as to be detachably fixed. Also,
In the present embodiment, the case where the temperature sensor is attached to the vicinity of the round end of the protective frame having a uniform height has been described, but the present invention is not necessarily limited to this, and the temperature sensor is attached to the protruding portion partially protruding from the opening edge of the protective frame. A temperature sensor may be attached.

In this embodiment, the case of applying to an electric rice cooker has been described, but the present invention is not limited to this, and an electric pot, an electromagnetic cooker, a microwave oven, an oven toaster,
It may be applied to hot plates, grill pans, electric fryer, tableware dryers, gas rice cookers, electric pans, etc. Further, the sensor is not limited to the temperature sensor, and may be a pressure sensor, a light sensor, a magnetic sensor, a humidity sensor, or the like.

As shown in FIG. 1, the protective frame 40 is placed on the cover 34 in a state where the annular reflecting plate 35 is fitted to the positioning rib 48 protruding from the back surface of the protective frame 40 and the positioning is continued. The screw 61 (FIG. 2) that is positioned and inserted into the through hole of the boss 12 is screwed into the screw hole 40a of the protective frame 40, and the bosses 13a, 13b, 13c of the bottom body 10,
A support arm 41a, 41b, 4 of the protective frame 40 is secured by a screw (not shown) screwed into the screw hole 13e provided at the base of 13d.
The protection frame 40 is fixed to the bottom body 10 by fixing the 1c and 41d to the bosses 13a, 13b, 13c and 13d, respectively. Then, the plug 31c of the lead wire 31b electrically connected to the printed board 31 is locked in the slit 42a provided in the locking tongue 42 of the protective frame 40 (FIG. 1).
6). The locking tongue piece may be provided on a rib protruding from the bottom body 10.

As a result, the ribs 14a, 1 of the bottom body 10 are
4b, 14c and ribs 34a, 34b of the cover 34 support the coil 50 arranged on the back surface of the protective frame 40 and prevent the coil 50 from falling off. In addition, although the case where the coil 50 is directly supported by the ribs 14a to 14c and 34a, 34b has been described in the present embodiment, the invention is not limited to this, and the coil 50 is indirectly supported by supporting the ferrite 51 by the rib 14a or the like. May be supported by.

Then, the lead wire 52a drawn out from the temperature sensor 52 is engaged with the hook 44 of the protective frame 40 to bypass the lead wire 52a, and then connected to the printed circuit board 31 so that a part of the lead wire 52a is bottomed. Drain hole 1 in body 10
Pass almost 6 above. Therefore, even if water leaks from the interface between the through hole 43 of the protective frame 40 and the temperature sensor 52,
Water travels along the lead wire 52a and the boss 13a and the partition wall 15
It falls in the area delimited by and and is discharged to the outside through the drain hole 16. As a result, the leaked water is printed circuit board 3
There is an advantage that it is possible to prevent electric leakage and the like due to water leakage without coming into contact with 1.

The inner case 60 is a cylindrical body made of a thin metal plate and is positioned by fitting it into the inner peripheral edge of the opening of the protective frame 40.

The shoulder body 70 has a shape that can be fitted to the bottom body 10, and has bosses 13a, 13b, 13c, 13
The screws (not shown) inserted through the loose fitting holes 13f respectively provided in d are used for supporting arm portions 41a, 41b of the protective frame 40,
It is integrated by being screwed into a boss 71 (a boss located on the back side in FIG. 1 is not shown) projecting on the back surface of the shoulder body 70 through a through hole 41f provided in 41c and 41d. According to this embodiment, since the protective frame 40 is supported through the through holes 41f provided in the supporting arm portions 41a to 41d, there is an advantage that the supporting span is short and the external impact force is strong.

As shown in FIGS. 16 to 18, the shoulder body 70 has a stepped portion 73 to which the pan spacer 72 can be attached with one touch at the opening edge portion. The pot spacer 72 is a resin molded product having excellent heat resistance such as nylon,
The shoulder body 70 is protected from the heat of the pan 90 which becomes high temperature.

Therefore, according to this embodiment, as shown in FIG. 19, since the cutout portion 74 is not formed in the portion to which the pan spacer 72 is attached, the dew adhered to the back surface of the lid 80 of the shoulder body 70. Even if it falls down on the edge of the opening, the dew drops along the stepped portion 73 to the inner peripheral surface of the inner case 60 (see FIG. 1).
8). Therefore, as shown in FIG. 20, dew does not enter from the interface between the cutout portion 74 provided on the opening edge portion of the shoulder body 70 and the pan spacer 72, and the print provided on the lower side of the inner case 60. There is an advantage that the substrate 31 is not short-circuited.

Further, the shoulder body 70 is provided with a connection work port 75 at a position corresponding to the locking tongue 42 of the protection frame 40 on the outer peripheral surface thereof, and the connection work port 75 is a detachable cover. Sealed at 76. Therefore, the shoulder body 70 has a lid 80
After the plug 31c of the lead wire 31b removed from the locking tongue 42 is pulled out from the connection work opening 75, the plug 81b of the lead wire 81a pulled out from the lid 80 is drawn out from the connection work opening 75. , The plugs 31c and 81b are connected to each other, and then the plug 3
1c and 81b are stored again in the shoulder body 70 from the connection work port 75, the plug 31c is locked to the locking tongue 42, and then the connection work port 75 is closed by the cover 76 to complete the connection work. .

In the present embodiment, the case where the invention is applied to an electric rice cooker has been described, but the invention is not necessarily limited to this. For example, an appliance that needs to electrically connect the container body and the lid, such as an electric pot, a gas rice cooker, and an electric rice cooker. Of course, it may be applied to a pot.

As shown in FIG. 16, the pot 90 has a protective frame 4
0 and the inner body 60, and is housed in a space formed by the inner body 60 and sealed by a sealing material 82 provided on the back surface of the lid 80. A high-frequency current is passed through the coil 50 to alternately generate vortices. Heat is generated by electric current and rice is cooked.

In the above-described embodiment, after the cooling fan 30 and the printed circuit board 31 are assembled to the bottom body 10 to which the cord reel unit 20 is attached, the protection frame 40, the inner case 60, and the shoulder body 70 are sequentially assembled, and finally the shoulder body. The case where the lid 80 is attached to the body 70 has been described, but the case is not limited to this.
On the contrary, after assembling the inner body 60 and the protective frame 40 to the overturned shoulder body 70, the bottom body 10 is assembled to the shoulder body 70, and the lid 80 may be attached to the finally inverted half-finished shoulder body 70. .

[0032]

[Brief description of drawings]

FIG. 1 is an exploded cross-sectional view showing an electric rice cooker which is an embodiment of an electric device according to the present invention.

FIG. 2 is an enlarged sectional view of a main part of the bottom body shown in FIG.

FIG. 3 is an enlarged bottom view of the bottom body shown in FIG.

4 is a plan view of the cover shown in FIG. 1. FIG.

5 is a plan view of the bottom body shown in FIG. 1. FIG.

6 is a plan view of the heat sink shown in FIG. 1. FIG.

FIG. 7 is a plan view of the printed circuit board shown in FIG.

8 is a plan view showing a combined state of the heat sink, the printed circuit board and the cooling fan shown in FIG.

9 is a cross-sectional view of the protective frame shown in FIG.

FIG. 10 is a bottom view of FIG.

FIG. 11 is a bottom view showing how the sensor is attached to the protective frame shown in FIG.

12 is a sectional view taken along line XII-XII of the protective frame shown in FIG.

FIG. 13 is an exploded perspective view for explaining a method of attaching the sensor to the protective frame shown in FIG.

FIG. 14 is a partial cross-sectional view of the sensor stopper shown in FIG.

15 is a side view of the sensor stopper shown in FIG. 9. FIG.

16 is a half cross-sectional view for explaining a method for assembling the electric rice cooker shown in FIG.

FIG. 17 is a partial perspective view of the shoulder body shown in FIG.

FIG. 18 is a partial cross-sectional view of the shoulder body shown in FIG.

FIG. 19 is a partial perspective view of a shoulder body according to a conventional example.

FIG. 20 is a partial cross-sectional view of a shoulder body according to a conventional example.

[Explanation of symbols]

10 ... Bottom body, 12 ... Boss, 13a to 13d ... Boss, 14
a to 14c ... Rib, 15 ... Partition wall, 17 ... Positioning projection, 18 ... Recess, 18a ... Slit, 20 ... Cord reel unit, 30 ... Cooling fan, 31 ... Printed circuit board, 32 ... Electronic component, 33 ... Heat sink , 34 ... cover, 34a ... rib, 40 ... protective frame, 42 ... locking tongue,
45 ... Rib, 50 ... Induction heating coil, 51 ... Ferrite, 60 ... Inner body, 70 ... Shoulder body, 75 ... Connection work port, 76
… Cover, 80… Lid, 90… Pan.

Claims (1)

[Claims] 1. An air-cooling device of an electric device for cooling an electronic component by blowing air sucked by a cooling fan from a slit provided in the housing to a heat sink attached to the electronic component in the housing, the air-cooling device extending along the periphery of the cooling fan. The air sucked by the cooling fan from the slit provided in the housing at the outlet of the space partitioned by the partition wall having a substantially C-shape in plan view protruding from the inner surface of the housing and the cover covering the upper opening of the partition wall. An air-cooling device for electric equipment, characterized in that it is provided with a heat sink for blowing.