JPS6349621Y2 - - Google Patents

Description

[Detailed description of the invention] [Purpose of the invention] (Field of industrial application) The present invention relates to a heating cooking device equipped with a microcomputer (hereinafter referred to as a microcomputer) used for cooking, and in particular, The present invention relates to a heat shielding (insulation) device for a printed circuit board in a cooking device.

(Prior Art) This type of heating cooking device equipped with a microcomputer that has already been proposed has an oven and a machine room separated by a partition frame inside the cabinet body.
An operation panel is installed on the front of the above cabinet body, and on the back side of the above operation panel where the machine room is located.
The printed circuit board (PC) that constitutes the core of the microcontroller
Various electronic components such as a large number of transistors, integrated circuits (ICs), resistors, capacitors, etc. are attached to the board (also called a board).

Therefore, inside the machine room of the heating cooking device mentioned above,
It is heated to a high temperature by a high voltage transformer, magnetron, etc. installed in this machine room.

(Problem to be solved by the invention) However, during cooking, the ambient temperature of the printed circuit board in the machine room incorporated in the above-mentioned heating cooking device rises to about 70°C or higher due to radiant heat from the magnetron, heater, high-voltage transformer, etc. Temperatures are also expected to reach.

In particular, inside the machine room of the above-mentioned cabinet body,
Because heat-generating electrical equipment such as magnetrons and high-voltage transformers are installed, these are forcibly cooled using cooling fans, but the high-temperature hot air and radiant heat that exchanged heat with these equipment is e.g. When the temperature is 35°C, it is predicted that the temperature will rise to about 70°C in the atmosphere of the printed circuit board, and it is predicted that this will cause the microcomputer to malfunction and impair its functionality.

In order to eliminate the above-mentioned drawbacks, the present invention blocks the radiant heat of heat-generating electrical equipment such as magnetrons and high-voltage transformers, and prevents the thermal influence of electronic components incorporated in the above-mentioned printed circuit board. The purpose of the present invention is to provide a cooking device that aims to improve reliability without impairing the functions of electronic components or microcomputers.

[Structure of the idea]

(Means for Solving the Problems and Their Effects) The present invention provides a partition frame in which an oven and a machine room are divided into a cabinet body equipped with an operation panel, and a part of this partition frame is equipped with a magnetron. In the heating cooking apparatus, a high voltage transformer and a high voltage condenser are installed in the cabinet body 1 in which the machine room is located, and a printed circuit board is installed in the machine room on the back side of the operation panel to form a cooling flow path. A heat shield plate is provided on the back side of the printed circuit board so as to be inclined backward, and a first vent hole and a second vent hole are provided on the bottom plate of the cabinet body so that the heat shield plate is arranged in front and behind the printed circuit board and the lower part of the heat shield plate. A first exhaust port is provided at the lower part of the side plate of the cabinet body to direct the fluid inverted by the heat shield plate to the second outlet.
A second hole is provided in the upper part of the side plate near the printed circuit board, and a second hole is provided in the upper part of the side plate near the printed circuit board.
An exhaust port is provided to exhaust the fluid that has passed through the cooling channel from the first vent, and the heat shield plate blocks radiant heat from the magnetron, high-voltage transformer, and high-voltage condenser, and removes the waste heat. It is designed to smoothly discharge the heat to the outside of the machine so as not to have an adverse thermal effect on the printed circuit board, thereby preventing malfunction of the microcomputer.

(Example) Hereinafter, the present invention will be described with reference to an illustrated example.

In FIGS. 1 to 6, reference numeral 1 denotes a box-shaped cabinet body equipped with an opening/closing door 1a.
Inside this cabinet body 1, an oven 2 and a machine room 3 are provided separated by a partition frame (oven frame) 4, and inside this oven 2, each heater 5 is installed. The oven 2, which is arranged above and below in parallel and located between both the heaters 5, has a shelf board 7 on which the food to be cooked 6 is placed.
is provided so that it can be inserted and removed freely.

On the other hand, the partition frame 4 where the machine room 3 is located
A magnetron 8 is installed in a part of the
An antenna 8a of the magnetron 8 is provided to protrude from a waveguide 9 attached to the top plate 4a of the partition frame 4. A cooling duct 10 is disposed outside the magnetron 8, and an opening 10a at one end of the cooling duct 10 is connected to the back plate 1 of the cabinet body 1 in which the machine room 3 is located.
A cooling blower 12 provided through a bracket 11 allows cooling fluid to flow into the opening 10 at the other end of the cooling duct 10.
b communicates with a ventilation hole 13 bored on one side of the partition frame 4.

On the other hand, an operation panel 15 equipped with a printed circuit board 14 including a microcomputer (microcomputer) is vertically provided on the front side of the cabinet body 1 with a gap in between, and an operation panel 15 is provided integrally on the back side of the operation panel 15. The printed circuit board 14 is erected with a cooling flow path formed between it and the back surface of the operation panel 15 . Also, the bottom plate 1c of the cabinet body 1 of the machine room 3 of this printed circuit board 14
For example, a high voltage transformer 16 and a high voltage capacitor 17 are provided, and the printed circuit board 1
4 and the high voltage transformer 16 is a heat shield plate 1.
8 is provided with a slight rearward inclination with respect to the printed circuit board 14. Furthermore, the machine room 3
The bottom plate 1c of the cabinet body 1 has a
A first vent hole 19a and a second vent hole 19b are provided, and the printed circuit board 14 and the heat shield plate 1 are provided with a first vent hole 19a and a second vent hole 19b.
The lower part of 8 is provided so as to be divided into two by partitioning the first vent hole 19a and the second vent hole 19b into front and rear.

Therefore, the cooling fluid flowing in from the first vent 19a is directed toward the printed circuit board 14 and the operation panel 1.
5 and the back surface of the printed circuit board 14 to cool it by exchanging heat with the printed circuit board 14. On the other hand, the fluid from the cooling blower 12 flows through the high pressure transformer. While cooling the air 16, the air blows onto the heat shield plate 18, but it is turned downward by the heat shield plate 18 and is exhausted upwardly outside the machine through the second vent hole 19b.

Furthermore, a first exhaust port 20a is bored in the lower part of the side plate 1d of the cabinet body 1 where the machine room 3 is located.
As shown in the enlarged view in FIG.
It is cut and raised so that the exhaust flow that is reversed by the heat shield plate 18 flows out rearward in cooperation with the vent hole 19b. Further, a second exhaust port 20b is bored in the upper part of the side plate 1d close to the printed circuit board 14, and this second exhaust port 20b directs the fluid that has cooled the printed circuit board 14 upward to the outside of the machine. It is designed to be exhausted.

The operation of the present invention will be explained below.

When the cooling blower 12 is driven during cooking, a portion of the cooling fluid in the cooling blower 12 is
The magnetron 8 is cooled by exchanging heat with the magnetron 8 in the cooling duct 10, and the heat exchanged fluid flows into the oven 2 through the ventilation hole 13.

On the other hand, the remaining cooling fluid of the cooling blower 12 cools the high-voltage transformer 16 and the like in the machine room 3, and then collides with the inclined heat shield plate 18 and reverses, flowing into the second ventilation hole 19b. At the same time that the heat is exhausted from the first exhaust port 20a, the radiant heat from the high-voltage transformer 16 is also reversed by the heat shield plate 18 and discharged downwardly outside the machine together with the exhaust flow.

On the other hand, the cooling fluid flowing in from the first vent 19a flows through the printed circuit board 14 and the operation panel 15.
The printed circuit board 14 is cooled while rising through a cooling passage formed between the cooling fluid and the back surface of the cooling fluid, and then this cooling fluid is exhausted upwardly outside the machine from the second exhaust port 20b.

Therefore, since the shielding plate 18 blocks radiant heat and reverses the heat-exchanged exhaust flow, the printed circuit board 14 is protected from the risk of damage to the functions of the electronic components due to thermal effects. It will go away.

Although the heat shield plate 18 according to the present invention has been described as an inclined plate having a heat insulating function, the design may be changed, for example, by coating with a heat absorbing member, without changing the gist of the present invention. Be free.

[Effect of idea]

As described above, according to the present invention, the second exhaust port is provided in the upper part of the side plate close to the printed circuit board,
Since the cooling fluid that flows in through the first vent and passes through the cooling channel between the operation panel and the printed circuit board is exhausted, the printed circuit board is sufficiently cooled and the heat shield plate is Since it is installed at an angle toward the components, it not only blocks the radiant heat of the electrical components toward the printed circuit board, but also
The cooling fluid that has exchanged heat with the electrical components can also be reversed in the opposite direction, and the second vent and first exhaust port work together to smoothly discharge it outside the machine, greatly increasing the cooling efficiency of the printed circuit board. It is possible to improve the performance of the microcomputer by reducing adverse thermal effects and prevent malfunctions on the microcomputer.The structure is also simple, making it easy to assemble and saving labor through mass production. .

[Brief explanation of the drawing]

FIG. 1 is a front view of the heating cooking device according to the present invention, FIG. 2 is a vertical cross-sectional view of the same, FIG. 3 is a cross-sectional view taken along the chain line A-A in FIG. 2, and FIG. 1st
The right side view of the figure, Figure 5 is the dashed line B-B in Figure 3.
6 is a cross-sectional view along dashed line C-C in FIG.
It is a partially enlarged cross-sectional view along. 1... Cabinet body, 2... Oven, 3
... Machine room, 4 ... Partition frame body, 8 ... Magnetron, 14 ... Printed circuit board, 15 ... Operation panel, 18 ... Heat shield plate, 19a ... First vent, 1
9b...Second ventilation port, 20a...First exhaust port, 2
0b...Second exhaust port.

Claims (1)

[Scope of utility model registration request] A cabinet body, a machine room formed by dividing the cabinet body by a partition frame, an operation panel disposed on the cabinet body on the front side of this machine room, and a machine room disposed on the back side of the operation panel. A printed circuit board stands up with a cooling flow path formed between it and the operation panel, electrical components such as a magnetron and a high voltage transformer are arranged in the machine room, and the above operation is performed to cool the electrical components. A cooling blower is installed in the cabinet body at the back of the machine room located on the opposite side of the panel, and an electric component is installed between the printed circuit board and the electrical components to block radiant heat and reverse the heat-exchanged cooling fluid. A heat shield plate is installed at an angle to the side, and a cooling channel is installed on the bottom plate of the cabinet body in order to take in outside air into the cooling passage formed between the operation panel and the printed circuit board, which is located below the heat shield plate. A first vent provided in the bottom plate of the cabinet body is located between the heat shield plate and the cooling blower and is separated from the first vent hole by a lower part of the heat shield plate. a second air vent; a first exhaust port located closer to the cooling blower than the heat shield plate and provided along the lower part of the side plate of the cabinet body; A heating cooking device comprising: a second exhaust port provided at the top of a side plate of the cabinet body close to the printed circuit board for exhausting heat to the outside after completing heat exchange with the circuit board.