JP7271534B2 - heating cooker - Google Patents

Description

TECHNICAL FIELD The present invention relates to a heating cooker in which a circuit board is provided inside a door of a heating chamber.

Patent Literature 1 proposes a heating cooker in which an operation unit and a circuit board that performs various processes in response to the operation of the operation unit are provided inside a door that is an open/close door of the heating chamber.

Since circuit boards are generally vulnerable to heat, in the heating cooker disclosed in Patent Document 1, the door is provided with cooling means for cooling the circuit board provided on the door, so that the circuit board provided on the door is kept at a constant temperature. I'm trying to keep it below.

Japanese patent publication "JP 2008-224081"

By the way, the circuit board provided in the door is heated by radiant heat from the heating chamber during cooking. For this reason, like the heating cooker disclosed in Patent Document 1, cooling air is circulated in the gap between the operation button provided on the surface of the door and the circuit board inside the door to cool the circuit board. In the cooling configuration, although cooling air is circulated in the circuit board housing part, the cooling air does not hit the surface of the circuit board housing part opposite to the operation button (the surface receiving radiant heat from the heating chamber during cooking). do not have.

Therefore, in the heating cooker disclosed in Patent Document 1, the radiant heat is not sufficiently shielded against the surface of the circuit board on the heating chamber side provided in the door, and the circuit board cannot be sufficiently cooled. Problems such as the life of circuit parts and malfunction of the microcomputer may occur.

An object of one aspect of the present invention is to provide a heating cooker capable of sufficiently cooling a circuit board provided in a door that opens and closes a heating chamber.

In order to solve the above problems, a heating cooker according to one aspect of the present invention is a heating cooker including an opening/closing door that opens and closes an opening of a heating chamber, wherein an operation unit is provided on the front surface of the opening/closing door. In addition, a circuit board is provided in the open/close door for receiving operations from the operation unit and performing various processes, and a duct is provided so as to overlap at least a part of the back surface of the circuit board housing unit, and the circuit board is connected to the circuit board. The accommodation section has a space serving as a first air passage through which cooling air flows from the outside, and the duct has a space serving as a second air passage through which cooling air flows from the outside, which is different from the first air passage. The second air passage has an outlet provided separately from the first air passage, and the duct is formed of a metal plate.

ADVANTAGE OF THE INVENTION According to the aspect of this invention, it is effective in the ability to fully cool the circuit board provided in the opening-and-closing door which opens and closes a heating chamber.

BRIEF DESCRIPTION OF THE DRAWINGS It is a front view of the heating cooker which concerns on Embodiment 1 of this invention. Fig. 2 is a perspective view of a door of the heating cooker shown in Fig. 1; Figure 3 is an exploded perspective view of the door shown in Figure 2; (a) is a sectional view taken along the line AA of the door shown in FIG. 2, and (b) is a simplified diagram of (a). 5 is a cross-sectional view taken along line BB of the cross-sectional view shown in FIG. 4; FIG. FIG. 4 is a schematic diagram of a door of a cooking device according to Embodiment 2 of the present invention; It is a schematic sectional drawing of the heating cooker which concerns on Embodiment 3 of this invention.

[Embodiment 1]
An embodiment of the present invention will be described in detail below.

<Overview of heating cooker>
FIG. 1 is a front view of a heating cooker 1 of this embodiment, in which (a) shows a state in which a door (an open/close door) 3 is closed, and (b) shows a state in which the door 3 is opened. The heating cooker 1 is equipped with a magnetron (not shown) that generates microwaves, and performs microwave cooking as heating cooking. The heating cooker 1 may have an oven cooking function and the like in addition to the microwave cooking function.

As shown in FIG. 1, the heating cooker 1 includes a rectangular parallelepiped casing 2 and a door 3, and a space surrounded by the casing 2 serves as a heating chamber 2a for storing objects to be heated. The magnetron is provided inside the casing 2 (for example, on the side opposite to the door 3 across the heating chamber 2a).

The door 3 is an opening/closing door for opening and closing the opening 2b of the heating chamber 2a, and includes a window (window portion) 3a arranged at a position facing the heating chamber 2a and a frame (frame portion) 3b surrounding the window 3a. and Heat-resistant glass or heat-resistant transparent resin is fitted in the window 3a so that the heating chamber 2a can be seen. The frame 3b is made of a nonmetallic material such as resin.

The door 3 is provided so as to be able to open and close the heating chamber 2a. In the present embodiment, the opening and closing of the door 3 is performed by rotating the lower side of the door 3 substantially as a center. A configuration in which the door 3 opens and closes by rotating around the center may be employed. Details of the door 3 will be described later.

A shield material (not shown) having a size that covers the opening 2b at the entrance of the heating chamber 2a is formed on the surface of the door 3 facing the heating chamber 2a.

The heating cooker 1 is further provided with a display operation unit 5 on the front surface of the door 3 for displaying various information about the heating cooker 1 and for receiving operations to the heating cooker 1 . The display/operation unit 5 is provided with a dial 6, buttons 7, and a display panel 8 for displaying various information such as operation information. Note that the display operation unit 5 may be configured as a touch panel, for example, without using physical members such as the dial 6 and the buttons 7 .

Next, the detailed structure of the door 3 will be described.

<Overview of Door 3>
2 shows a perspective view of the door 3, and FIG. 3 shows an exploded perspective view of the door 3. FIG.

As shown in FIG. 2, the door 3 has a panel portion 31a for providing the display operation portion 5 below the window 3a. More specifically, the door 3 includes a panel portion 31a, a start button 31b and an encoder button 31c, a panel lattice 31d, a button support shaft 31e, and a selection button, which constitute the dial 6 of the display operation portion 5, as shown in FIG. (B) 31f, cancel button 31g, selection button (A) 31h, fan 31i, circuit board 31j, outer door glass 31k, air passage plate 31l, glass stopper 31m, door support member 31n, door subframe 31o, door packing 31p and a door cover 31q.

The door 3 configured as described above has a structure in which a circuit board 31j is provided inside. This circuit board 31j is an operation board for receiving operations from the display operation unit 5 and performing various processes such as cooking in the heating cooker 1 . Generally, the circuit board 31j is vulnerable to heat. Normally, during cooking in the heating cooker 1, the temperature in the heating chamber 2a reaches about 300° C. depending on the menu. Therefore, the heating cooker 1 according to this embodiment includes a cooling mechanism for cooling the circuit board 31j.

<Cooling Mechanism for Circuit Board 31j>
(a) of FIG. 4 is a cross-sectional view taken along line AA of FIG. 2, and (b) is a simplified view of (a). 5 is a cross-sectional view taken along line BB in FIG. 4. FIG.

A duct 40 formed by the air passage plate 31l is formed on the back surface of the circuit board 31j (the surface opposite to the surface on which the display operation unit 5 is provided). The air passage plate 31l has a substantially U-shaped cross section, and is installed in the frame (frame portion) 3b with the concave side facing the direction along the longitudinal direction of the circuit board 31j. forming a duct 40 having a In addition, the air passage plate 31l is made of a metal substrate.

The duct 40 is configured such that the cooling air from the blower fan 31i is introduced from the supply port 40a at one end, and the cooling air flowing through the duct 40 is discharged from the discharge port 40b (FIG. 6) at the other end. It's becoming As a result, the cooling air flowing through the duct 40 cools the rear side (heating chamber side) of the housing portion of the circuit board 31j. Further, the cooling air from the blower fan 31i is configured to flow not only to the supply port 40a of the duct 40 but also to the accommodating portion side of the circuit board 31j. As a result, the front and back sides of the circuit board 31j are also cooled. That is, the cooling air sucked by the blower fan 31i from the suction port (not shown) provided in the lower left part of the door 3 (under the blower fan 31i) flows to the front and rear surfaces of the circuit board 31j and further to the duct 40. . The cooling air that has flowed on the front and back surfaces of the circuit board 31j is discharged outside the door 3 through the exhaust hole 3d (FIG. 6) provided in the lower right portion of the door 3 (under the partition plate 141) and flows through the duct 40. The cooled air is discharged out of the door 3 through an air outlet 40b (FIG. 6) provided separately from the air outlet.

The duct 40 may be formed so as to overlap at least a portion of the back surface of the circuit board 31j, but is preferably formed over the entire back surface of the circuit board 31j in terms of cooling efficiency.

As described above, the blower fan 31i, the duct 40, and the exhaust hole 3d constitute a cooling mechanism for cooling the circuit board 31j.

<effect>
In the heating cooker 1 having the above configuration, a circuit board 31j is provided inside the door 3, and the back surface of the circuit board 31j, that is, the surface opposite to the surface facing the display operation unit 5 (the surface of the heating chamber when the door 3 is closed) A duct 40 is provided so that at least a portion of the surface facing the 2a) overlaps. Since the inside of the duct 40 is a space, the duct 40 can shield the heat from the heating chamber 2a. In this way, the radiant heat from the heating chamber 2a is shielded by the duct 40, so that the temperature rise of the circuit board 31j can be suppressed. Therefore, there is an effect that the circuit board 31j can be sufficiently cooled.

Furthermore, the heating cooker 1 is provided with a blower fan 31 i that is a blower that blows cooling air into the duct 40 . As a result, the cooling air generated by the blower fan 31i is blown into the duct 40, so that the cooling efficiency of the back surface of the circuit board 31j can be further enhanced. Moreover, the cooling air generated by the blower fan 31i is also blown to the surface of the circuit board 31j, that is, the surface on the display operation unit 5 side and the back surface. As a result, the circuit board 31j is cooled on the front surface and the back surface, so that the cooling efficiency of the circuit board 31j can be further improved.

An outlet 40 b of the duct 40 is an outlet for discharging the cooling air to the outside of the heating cooker 1 and is formed below the partition plate 141 .

As a result, the cooling air flowing through the duct 40 is discharged to the outside of the door 3 through the discharge port 40b. In other words, since the blower fan 31i can always continue to send fresh cooling air to the duct 40, it is possible to further improve the cooling efficiency of the circuit board 31j.

Moreover, since the cooling air that has passed through the front and back surfaces of the circuit board 31j is also discharged to the outside of the door 3 through the exhaust holes 3d, the circuit board 31j can further improve the cooling efficiency of the front and back surfaces.

In order to improve the cooling efficiency of the circuit board 31j, it is preferable that the cooling air always flows within the duct 40, and it is not preferable that the cooling air stay within the duct 40. In the second embodiment below, an example will be described in which the cooling air sent into the duct 40 is prevented from staying inside the duct 40 .

[Embodiment 2]
Another embodiment of the present invention will be described below with reference to FIG. For convenience of explanation, members having the same functions as those of the members explained in the above embodiment are denoted by the same reference numerals, and the explanation thereof is omitted.

FIG. 6 shows the door 3 in the heating cooker of this embodiment, where (a) is a front view and (b) is a rear view. For convenience of explanation, the front view of the door 3 shows a state in which the panel lattice 31d is removed and the blower fan 31i is exposed, and the rear view shows a state in which the duct 40 is removed.

In the door 3, cooling air from the blower fan 31i is introduced from the supply port 40a of the duct 40 and discharged to the outside of the door 3 from the discharge port 40b, as in the first embodiment.

Furthermore, a partition plate 141 is formed in the vicinity of the outlet 40b of the duct 40 to narrow the width of the duct 40 on the downstream side rather than the upstream side. That is, the air passage in the duct 40 is narrowed before the discharge port 40b. As a result, the pressure of the cooling air flowing through the duct 40 is increased near the outlet 40b because the air passage is narrowed, so the flow velocity of the cooling air increases near the outlet 40b. As a result, the cooling air from the blower fan 31i is properly discharged to the outside from the discharge port 40b without stagnation in the duct 40. As shown in FIG. Therefore, fresh cooling air always flows to the rear surface of the circuit board 31j, so that the rear surface of the circuit board 31j can be efficiently cooled.

[Embodiment 3]
Still another embodiment of the present invention will be described below with reference to FIG. For convenience of explanation, members having the same functions as those of the members explained in the above embodiment are denoted by the same reference numerals, and the explanation thereof is omitted.

FIG. 7 is a side sectional view of the heating cooker 201 of this embodiment.

Radiant heat from the heating chamber 202a is transferred to the circuit board 231j inside the door 203 through the opening 202b. Therefore, in order to reduce the influence of radiant heat from heating chamber 202a in door 203, circuit board 231j is generally preferably arranged at a position far from opening 202b.

However, in the heating cooker 201 of this embodiment, the duct 240 is provided on the back side of the circuit board 231j (the side of the heating chamber 202a), so the circuit board 231j is less susceptible to the radiant heat from the heating chamber 202a. Therefore, as shown in FIG. 7, the heating cooker 201 is configured such that the circuit board 231j provided in the door 203 closes the opening 202b of the heating chamber 202a in the casing 202 while the door 203 closes the opening 202b. may be arranged so as to at least partially overlap (the OL portion in the figure). In this case, the duct 240 is also arranged so as to at least partially overlap with the opening 202b of the casing 202, like the circuit board 231j. The duct 240 is preferably arranged so as to cover the entire rear side of the circuit board 231j, but is preferably arranged so as to cover at least the portion where the circuit board 231j overlaps the opening 202b. .

Therefore, as long as the duct 240 is provided on the back side of the circuit board 231j, the circuit board 231j can be placed at any position within the door 203. FIG.

In this way, since there is no space restriction for providing the circuit board 231j in the heating cooker 201, the degree of freedom in designing the heating cooker 201 is increased, design is emphasized, and space saving can be achieved. is possible, and as a result, the cost of manufacturing can be reduced.

In the above-described Embodiments 1 to 3, the radiant heat in the heating chamber and the ambient temperature can be efficiently blocked. Any heating cooker may be used, such as an oven.

The present invention is not limited to the above-described embodiments, but can be modified in various ways within the scope of the claims, and can be obtained by appropriately combining technical means disclosed in different embodiments. is also included in the technical scope of the present invention. Furthermore, new technical features can be formed by combining the technical means disclosed in each embodiment.

1 heating cooker 2a heating chamber 2b opening 3 door (opening/closing door)
3d exhaust hole 5 display operation unit (operation unit)
31i blower fan 31j circuit board 31l air passage plate 40 duct 40a supply port 40b discharge port 141 partition plate 201 heating cooker 202a heating chamber 202b opening 203 door (opening/closing door)
231j circuit board 240 duct

Claims (5)

In a heating cooker equipped with an opening and closing door for opening and closing the opening of the heating chamber,
An operation unit is provided in front of the opening and closing door, and a circuit board is provided in the opening and closing door for receiving operations from the operation unit and performing various processes,
A duct is provided so as to overlap at least a portion of the back surface of the circuit board,
The accommodation portion for the circuit board has a space serving as a first air passage through which cooling air flows from the outside, and the duct has a second air passage through which cooling air flows from the outside, which is different from the first air passage. has a space of
The second air passage has an outlet provided separately from the first air passage,
The heating cooker , wherein the duct is formed of a metal plate . 2. The heating cooker according to claim 1, further comprising an air blower for sending cooling air into the duct. 3. The heating cooker according to claim 2, wherein the outlet of the duct is an outlet for discharging the cooling air to the outside of the heating cooker. 4. The heating cooker according to claim 3, wherein the second air passage is narrowed in front of the outlet. 2. The circuit board is arranged so that at least a part of the circuit board overlaps the opening of the heating chamber when the openable door closes the opening of the heating chamber. 5. The heating cooker according to any one of 1 to 4.

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