WO2019235003A1 - Cooking device - Google Patents

Abstract

Provided is a cooking device in which a circuit board positioned within a door for opening and closing a heating compartment can be sufficiently cooled. A circuit board (31j) is positioned within a door (3) for opening and closing the heating compartment of a cooking device, and a duct (40) is provided so that the surface of the circuit board (31j), which faces a display operation section (5), and at least part of the opposite surface overlap each other.

Description

Cooker

The present invention relates to a cooking device in which a circuit board is provided in a door of a heating cabinet.

Patent Document 1 proposes a cooking device in which an operation unit and a circuit board that performs various processes in response to operations of the operation unit are provided in a door that is an opening / closing door of a heating cabinet.

In general, since a circuit board is vulnerable to heat, the heating cooker disclosed in Patent Document 1 is provided with a 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 try to keep it below.

Japanese Patent Publication “JP 2008-224081 A”

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 through a gap formed between the operation button provided on the surface of the door and the circuit board in the door, and the circuit board is circulated. In the cooling configuration, the cooling air is circulated in the circuit board housing part, but the cooling air hits the surface opposite to the operation button of the circuit board housing part (the surface receiving the radiant heat from the heating chamber during cooking). Absent.

Therefore, in the heating cooker disclosed in Patent Document 1, the radiation board is not sufficiently shielded against the surface of the circuit board provided in the door, and the circuit board is not sufficiently cooled. There is a risk of problems such as the life of circuit components and malfunction of microcomputers.

An object of one embodiment of the present invention is to provide a cooking device that can sufficiently cool a circuit board provided in a door that opens and closes a heating chamber.

In order to solve the above-described problems, a cooking device according to one aspect of the present invention is a cooking device including an opening / closing door that opens and closes an opening of a heating chamber, and an operation unit is provided on a front surface of the opening / closing door. In addition, a circuit board that receives various operations from the operation unit and performs various processes is provided in the open / close door, and a duct is provided so as to overlap at least a part of the back surface of the circuit board housing unit. To do.

According to one aspect of the present invention, there is an effect that the circuit board provided in the open / close door that opens and closes the heating chamber can be sufficiently cooled.

It is a front view of the heating cooker which concerns on Embodiment 1 of this invention. It is a perspective view of the door of the heating cooker shown in FIG. FIG. 3 is an exploded perspective view of the door shown in FIG. 2. (A) is an AA arrow directional cross-sectional view of the door shown in FIG. 2, (b) is a simplified view of (a). FIG. 5 is a cross-sectional view taken along line BB in the cross-sectional view shown in FIG. 4. It is the schematic of the door of the heating cooker which concerns on Embodiment 2 of this invention. It is a schematic sectional drawing of the heating cooker which concerns on Embodiment 3 of this invention.

Embodiment 1
Hereinafter, an embodiment of the present invention will be described in detail.

<Outline of cooking device>
FIG. 1 is a front view of a heating cooker 1 of the present embodiment, where (a) shows a state in which a door (opening / closing door) 3 is closed, and (b) shows a state in which the door 3 is opened. The cooking device 1 includes a magnetron (not shown) that generates microwaves, and is a cooking device that performs microwave cooking as cooking. The heating cooker 1 may have an oven cooking function in addition to a 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 is a heating chamber 2 a for accommodating an object to be heated. The magnetron is provided inside the casing 2 (for example, on the side opposite to the door 3 with the heating chamber 2a interposed therebetween).

The door 3 is an open / close door for opening and closing the opening 2b of the heating chamber 2a, and a window (window portion) 3a disposed at a position facing the heating chamber 2a and a frame (frame portion) 3b surrounding the window 3a. With. The window 3a is fitted with heat-resistant glass or heat-resistant transparent resin so that the heating chamber 2a can be seen. The frame 3b is made of a nonmetallic material, for example, a resin.

The door 3 is provided so that the heating chamber 2a can be opened and closed. The door 3 is pivoted about the lower end side, and a handle 4 is attached to the upper side as user assistance for opening and closing the door 3. In the present embodiment, the door 3 is configured to be opened and closed by rotating around the lower end side of the door 3. However, the present invention is not limited to this. For example, the left end or the right end of the door 3 is The door 3 may be configured to open and close by rotating to the center. Details of the door 3 will be described later.

Further, a shield material (not shown) having a size covering 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 cooking device 1 is further provided with a display operation unit 5 on the front surface of the door 3 for displaying various information related to the cooking device 1 and receiving operations on the cooking device 1. The display operation unit 5 is provided with a display panel 8 for displaying various information such as a dial 6 and buttons 7 and operation information. In addition, the display operation part 5 may be comprised as a touch panel which does not use physical members, such as the dial 6 and the button 7, for example.

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

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

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

The door 3 configured as described above has a structure in which a circuit board 31j is provided. The circuit board 31j is an operation board for accepting operations from the display operation unit 5 and performing various processes such as cooking in the heating cooker 1. In general, the circuit board 31j is vulnerable to heat. Usually, during cooking in the heating cooker 1, the temperature in the heating chamber 2a is about 300 ° C. according to the menu. For this reason, the heating cooker 1 according to the present embodiment includes a cooling mechanism for cooling the circuit board 31j.

<Cooling mechanism of circuit board 31j>
4A is a cross-sectional view taken along line AA in FIG. 2, and FIG. 4B is a simplified view of FIG. 5 is a cross-sectional view taken along line BB in 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 portion facing in the direction along the longitudinal direction of the circuit board 31j, and serves as an air passage through which cooling air flows. To form a duct 40 having The air passage plate 31l is made of a metal substrate.

The duct 40 introduces the cooling air from the blower fan 31i from the supply port 40a at one end, and discharges the cooling air flowing through the duct 40 from the discharge port 40b (FIG. 6) at the other end. It has become. Thereby, the back side (heating chamber side) of the accommodating portion of the circuit board 31j is cooled by the cooling air flowing through the duct 40. 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 from the suction port (not shown) provided in the lower left part of the door 3 (lower part of the blower fan 31i) by the blower fan 31i flows to the front and back surfaces of the circuit board 31j and further to the duct 40. . The cooling air flowing on the front and back surfaces of the circuit board 31j is discharged out of the door 3 through the exhaust hole 3d (FIG. 6) provided in the lower right part of the door 3 (lower part of the partition plate 141) and flows through the duct 40. The cooling air is discharged out of the door 3 through an exhaust port 40b (FIG. 6) provided separately from the exhaust hole.

The duct 40 may be formed so that at least a part of the back surface of the circuit board 31j overlaps, but it is preferable that the duct 40 is formed on the entire back surface of the circuit board 31j from the viewpoint of cooling efficiency.

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

<Effect>
The heating cooker 1 having the above configuration includes a circuit board 31j in 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 heating chamber when the door 3 is closed). The duct 40 is provided so that at least one part of the surface facing 2a overlaps. Since the inside of the duct 40 is a space, the heat from the heating chamber 2a can be shielded by the duct 40. Thus, since the radiant heat from the heating chamber 2a is shielded by the duct 40, an increase in the temperature of the circuit board 31j can be suppressed. Therefore, the circuit board 31j can be sufficiently cooled.

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

Also, the discharge port 40 b of the duct 40 is a discharge port for discharging cooling air to the outside of the heating cooker 1, and is formed in the lower part of the partition plate 141.

Thereby, the cooling air flowing through the duct 40 is discharged from the discharge port 40b to the outside of the door 3. That is, since the blower fan 31i can always send fresh cooling air to the duct 40, the cooling efficiency of the circuit board 31j can be further increased.

Moreover, since the cooling air passing 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 enhance the cooling efficiency of the front and back surfaces.

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

[Embodiment 2]
The following will describe another embodiment of the present invention with reference to FIG. For convenience of explanation, members having the same functions as those described in the embodiment are given the same reference numerals, and descriptions thereof are omitted.

FIG. 6 shows the door 3 in the cooking device of the present 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 where the panel lattice 31d is removed and the blower fan 31i is exposed, and the rear view shows a state where the duct 40 is removed.

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

Furthermore, a partition plate 141 is formed in the vicinity of the discharge port 40b of the duct 40 to narrow the width on the downstream side of the duct 40 on the upstream side of the air flow path. That is, the air passage in the duct 40 is narrowed in front of the discharge port 40b. As a result, the pressure related to the cooling air flowing in the duct 40 becomes higher due to the narrow air passage near the discharge port 40b, so that the flow velocity of the cooling air becomes faster near the discharge port 40b. As a result, the cooling air from the blower fan 31i is appropriately discharged outside from the discharge port 40b without stagnation in the duct 40. Therefore, since a new cooling air always flows on the back surface of the circuit board 31j, the back surface of the circuit board 31j can be efficiently cooled.

[Embodiment 3]
The following will describe still another embodiment of the present invention with reference to FIG. For convenience of explanation, members having the same functions as those described in the embodiment are given the same reference numerals, and descriptions thereof are omitted.

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

The radiant heat of the heating chamber 202a is transmitted from the opening 202b to the circuit board 231j in the door 203. For this reason, in general, the circuit board 231j is preferably disposed at a position far from the opening 202b in order to reduce the influence of radiant heat from the heating chamber 202a in the door 203.

However, in the heating cooker 201 of the present embodiment, the duct 240 is provided on the back side (the heating chamber 202a side) of the circuit board 231j, so that the circuit board 231j is not easily affected by the radiant heat from the heating chamber 202a. Accordingly, as shown in FIG. 7, the heating cooker 201 has a circuit board 231 j provided in the door 203 in the state where the door 203 closes the opening 202 b of the heating chamber 202 a in the casing 202. And at least partially overlap (OL portion in the figure). In this case, the duct 240 is also arranged so as to at least partially overlap the opening 202b of the casing 202, similarly to the circuit board 231j. The duct 240 is preferably arranged so as to entirely cover the back side of the circuit board 231j, but is preferably arranged so as to cover at least a 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 may be disposed at any position in the door 203.

As described above, 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 is achieved. As a result, the manufacturing cost can be reduced.

In Embodiments 1 to 3, since the radiant heat in the heating chamber and the ambient temperature can be effectively cut off, the heating cooker to which the present invention can be applied includes a heating chamber and an opening / closing door in addition to a microwave oven. Any heating cooker may be used, for example, an oven or the like.

The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope shown in the claims, and embodiments obtained by appropriately combining technical means disclosed in different embodiments. Is also included in the technical scope of the present invention. Furthermore, a new technical feature can be formed by combining the technical means disclosed in each embodiment.

1 Heating Cooker 2a Heating Chamber 2b Opening 3 Door (Open / Close Door)
3d Exhaust hole 5 Display / operation part (operation part)
31i Blower fan 31j Circuit board 31l Blower passage plate 40 Duct 40a Supply port 40b Discharge port 141 Partition plate 201 Heat cooker 202a Heating chamber 202b Opening 203 Door (open / close door)
231j Circuit board 240 Duct

Claims (5)

In a heating cooker with an open / close door that opens and closes the opening of the heating cabinet,
An operation unit is provided on the front surface of the door, and a circuit board for receiving various operations from the operation unit and performing various processes is provided in the door.
A heating cooker, wherein a duct is provided so as to overlap at least a part of the back surface of the circuit board. The heating cooker according to claim 1, further comprising a blowing section for sending cooling air into the duct. The heating cooker according to claim 2, wherein the discharge port of the duct is a discharge port for discharging cooling air to the outside of the heating cooker. The cooking device according to claim 3, wherein the air passage in the duct is narrowed in front of the discharge port. 2. The circuit board is arranged so that at least a part of the circuit board overlaps the opening in a state where the opening and closing door closes the opening of the heating chamber. The cooking device according to any one of 1 to 4.

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