gas oven

Abstract

To provide a gas oven in which an electric baseboard accommodated in an operation part hardly receives an influence of heat.SOLUTION: An operation part 10 accommodates an electric baseboard 51 in a front case 20 and a rear case 30. The operation part 10 is screwed and attached to an attachment plate part 7 which is fixed to an upper part of a main body part 2 of a gas oven. A body part 71 of the attachment plate part 7 covers at least a part of a back face of the rear case 30 from a rear side. A lower protrusion 75 of the attachment plate part 7 protrudes frontward from a lower end part of the body part 71, and covers at least a part of a bottom face of the rear case 30. The attachment plate part 7 protects the electric baseboard 51 from heat by shielding heat from a firing chamber, and suppressing a rise of a surface temperature of the rear case 30.SELECTED DRAWING: Figure 7

Description

Technical Field

[0001] The present invention relates to a gas oven.

Background Art

[0002] A gas oven has an operation unit above the opening of a baking chamber. The bottom and rear of the operation unit become hot due to the radiant heat from the baking chamber. An electrical control board is housed in the operation unit, and heat may affect its operation. For example, in Patent Document 1, metal panel angles are arranged on the bottom and back of the operation unit to prevent radiant heat from the baking chamber, thereby reducing the influence of heat on the electrical control board.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in a high-firepower gas oven, the surface temperature of the panel angle rises, and the radiant heat from the panel angle may affect the operation of the electrical control board.

[0005] An object of the present invention is to provide a gas oven in which the electrical control board housed in the operation unit is less affected by heat.

Means for Solving the Problems

[0006] The gas oven according to claim 1 of the present application comprises a baking chamber having an opening on the front side, an oven door provided on the front side of the baking chamber so as to be able to open and close vertically with its lower end as an axis and which closes the opening when closed, and an operating unit fixed above the oven door and above the opening of the baking chamber, which is electrically connected to a controller via a harness, wherein a metal mounting plate is provided above the opening of the baking chamber, having at least a back wall portion whose surface direction faces forward and a bottom wall portion extending forward from the lower end of the back wall portion and whose surface direction faces upward, and the operating unit is fixed to the mounting plate portion and has a front portion equipped with operating buttons and on both the left and right sides of the front portion The device comprises a resin front case having left and right side portions extending rearward from each end, and a top portion extending rearward from the upper end of the front portion and connecting to the left and right side portions; a resin rear case fixed to the rear of the front case, having a rear portion positioned behind the front portion and a bottom portion extending forward from the lower end of the rear portion; and one or more electrical circuit boards housed between the front case and the rear case, wherein, with the front case fixed to the mounting plate portion, the back wall portion of the mounting plate portion covers at least a part of the rear portion of the rear case from the rear, and the bottom wall portion of the mounting plate portion covers at least a part of the bottom portion of the rear case from below.

[0007] The gas oven according to claim 2 is characterized in that, in addition to the configuration of the invention according to claim 1, the back wall portion of the mounting plate portion is arranged with a predetermined first gap between it and the rear portion of the rear case, and the bottom wall portion of the mounting plate portion is arranged with a predetermined second gap between it and the bottom portion of the rear case.

[0008] The gas oven according to claim 3 is characterized in that, in addition to the configuration of the invention according to claim 2, it has a first communication portion between the upper end of the rear surface of the rear case and the upper end of the back wall portion of the mounting plate portion, which connects the first gap to the outside, and a second communication portion between the front end of the bottom surface portion of the rear case and the front end of the bottom wall portion of the mounting plate portion, which connects the second gap to the outside, and the first gap and the second gap are in communication, and a passage is formed between the operating portion and the mounting plate portion through the first communication portion and the second communication portion, respectively, through which air can pass.

[0009] The gas oven according to claim 4 is characterized in that, in addition to the configuration of the invention according to claim 3, the first communication section has an opening portion that connects the first gap to the outside and faces toward the rear of the operating section, and the second communication section has an opening portion that connects the second gap to the outside and faces toward the bottom of the operating section. [Effects of the Invention]

[0010] According to the gas oven of the invention described in claim 1, at least a portion of the rear and bottom surfaces of the rear case is covered by the mounting plate, so that the rise in the surface temperature of the rear case is suppressed and the substrate can be protected from heat.

[0011] According to the gas oven of the invention of claim 2, in addition to the effects of the invention described in claim 1, an air layer is formed in the first gap and the second gap formed between the rear and bottom surfaces of the rear case and the back wall and bottom wall of the mounting plate, so that the rise in the surface temperature of the rear case is further suppressed and the substrate can be protected from heat.

[0012] According to the gas oven of claim 3, in addition to the effects of the invention described in claim 2, the first and second communication points between the upper end of the rear surface and the front end of the bottom surface of the rear case and the upper end of the back wall and the front end of the bottom wall of the mounting plate connect the first gap and the second gap to the outside, respectively. As a result, the first communication point, the first gap, the second gap, and the second communication point function as passages through which air can pass between the operating section and the mounting plate, and the air in the first gap and the second gap can be circulated by the chimney effect. Therefore, the rise in the surface temperature of the rear case can be further suppressed, and the substrate can be protected from heat.

[0013] According to the gas oven of claim 4, in addition to the effects of the invention described in claim 3, the opening of the first communication section opens toward the rear of the control section, and the opening of the second communication section opens toward the bottom of the control section. Since the openings are not easily visible when the user looks down at the control section from their eye level, the gas oven can maintain an aesthetic appearance. [Brief explanation of the drawing]

[0014] [Figure 1] This is a front view of gas oven 1, which is integrated into kitchen counter 100. [Figure 2] This is a perspective view of gas oven 1 with the oven door 6 closed. [Figure 3] This is a perspective view of gas oven 1 with oven door 6 partially open. [Figure 4] This is an exploded perspective view of the control unit 10, viewed from above, to the right and forward. [Figure 5] This is an exploded perspective view of the control unit 10, viewed from above, to the right and rear. [Figure 6] This is a cross-sectional perspective view of the area near the control unit 10 in Figure 2, viewed from the front and upper right. [Figure 7] This is a side cross-sectional view of the area near the operating section 10 in Figure 2, viewed from the right. [Modes for carrying out the invention]

[0015] Hereinafter, embodiments of the present invention will be described. The device configurations and the like described below are not intended to be limited thereto only without specific descriptions, but are merely illustrative examples. Drawings are used to explain the technical features that the present invention can adopt. In the present embodiment, the front-back, left-right, and up-down directions shown in the drawings will be used for explanation.

[0016] As shown in FIG. 1, an opening (not shown) is provided on the upper surface of the countertop 101 of the kitchen counter 100, and the built-in stove 3 is dropped and installed into the opening from above. A vertically long rectangular opening 103 is provided in the counter panel 102 on the front of the kitchen counter 100. The front of the built-in stove 3 is exposed at the upper inner part of the opening 103. A gas oven 1 is installed below the built-in stove 3, and its front is exposed at the lower inner part of the opening 103.

[0017] Referring to FIGS. 2 and 3, the structure of the gas oven 1 will be described. The gas oven 1 includes a main body 2, a baking chamber 5 (see FIG. 3), an oven door 6, an exhaust pipe 9, an operation unit 10, etc. The main body 2 is a substantially rectangular parallelepiped metal box. A large rectangular opening 2A is formed on the front of the main body 2. The baking chamber 5 is provided in the opening 2A. A rectangular opening 5A is provided on the front of the baking chamber 5. An object to be cooked is accommodated inside the baking chamber 5 through the opening 5A.

[0018] The oven door 6 is formed in a substantially rectangular shape when viewed from the front, and is provided so as to be vertically opened and closed with the lower end side as an axis at the lower front side of the baking chamber 5 (see FIG. 3). A handle 6A extending in the left-right direction is provided at the upper front of the oven door 6. The oven door 6 closes the opening 5A of the baking chamber 5 in the closed state. Inside the main body 2, a combustion device (not shown) is provided below the baking chamber 5. The combustion device includes a gas burner. The high-temperature air heated by the combustion device flows into the baking chamber 5 by a fan (not shown). Thereby, the temperature inside the baking chamber 5 rises and the heating and cooking of the object to be cooked are performed.

[0019] The exhaust pipe 9 extends upward from the rear part of the baking chamber 5 through an opening (not shown) provided in the upper rear part of the main body 2 and is connected to the exhaust part (not shown) of the built-in oven 3. The exhaust pipe 9 communicates with the inside of the baking chamber 5 and allows the high-temperature air flowing out from the inside of the baking chamber 5 to flow into the exhaust part of the built-in oven 3. Thereby, the high-temperature air flowing out from the inside of the baking chamber 5 is discharged to the outside through the exhaust pipe 9 and the exhaust part of the built-in oven 3.

[0020] The operation unit 10 is formed in a substantially prismatic shape extending in the left-right direction and is screwed to a mounting plate part 7 (see FIG. 4) fixed to the upper front part of the main body 2. When the gas oven 1 is viewed from the front, the operation unit 10 is arranged above the oven door 6, and both the left and right end parts of the operation unit 10 protrude to both the left and right sides more than the oven door 6. On the front surface of the operation unit 10, various buttons and a display unit described later are provided to receive input of operations by the user and display messages for the user.

[0021] Referring to FIGS. 4 and 5, the shape of the mounting plate part 7 will be described. As shown in FIG. 4, the mounting plate part 7 is a substantially rectangular metal plate extending in the left-right direction in front view and includes a main body part 71, a right extension part 72, a left extension part 73, an upper protruding part 74, and a lower protruding part 75. The main body part 71 is formed in a substantially rectangular shape extending in the left-right direction in front view. At the right end of the main body part 71, a substantially rectangular right harness opening 76 is provided. At the left end of the main body part 71, a substantially rectangular left harness opening 77 is provided.

[0022] A substantially horizontally long substantially rectangular locking hole 78 is provided slightly to the right and near the lower end from the central part in the left-right direction of the main body part 71. A substantially horizontally long substantially rectangular locking hole 79 is also provided slightly to the left and near the lower end from the central part in the left-right direction of the main body part 71. Six fixing holes 71A are provided in the main body part 71.

[0023] The right extension 72 protrudes forward from the right end of the main body 71 and is formed in a roughly rectangular shape that is long in the vertical direction when viewed from the right side. The right extension 72 is provided with a pair of upper and lower fixing holes 72A. The fixing holes 72A penetrate the right extension 72 in the left direction. The left extension 73 protrudes forward from the left end of the main body 71 and is formed in a roughly rectangular shape that is long in the vertical direction when viewed from the left side. The left extension 73 is provided with a pair of upper and lower fixing holes 73A. The fixing holes 73A penetrate the left extension 73 in the left direction. The upper projection 74 protrudes rearward from the upper end of the main body 71 and is formed in a roughly strip shape that is long in the left direction when viewed from above. The lower projection 75 protrudes forward from the lower end of the main body 71 and is formed in a roughly strip shape that is long in the left direction when viewed from below.

[0024] As shown in Figure 3, the mounting plate portion 7, having the above shape, is positioned on the upper front surface of the main body portion 2 and fastened with six screws 8 through six fixing holes 71A provided in the main body portion 71 to six fixing holes (not shown) on the main body side provided on the upper front surface of the main body portion 2. In this way, the mounting plate portion 7 is fixed to the upper front surface of the main body portion 2.

[0025] Next, the configuration of the control unit 10 will be described. The control unit 10 comprises a front case 20 and a rear case 30, which are combined and fixed to each other in the front-to-back direction to form a roughly rectangular box-shaped body that is long in the left-to-right direction. Inside the control unit 10 are the three electrical circuit boards 51-53, a fan 55, etc., which will be described later.

[0026] The front case 20 is formed in the shape of a roughly rectangular box that extends in the left-right direction when viewed from the front and opens toward the rear. The material of the front case 20 is resin. The front case 20 comprises a front wall 21, a right wall 22, a left wall 23, an upper wall 24, and a lower wall 25 (see Figures 5 and 6).

[0027] The front wall portion 21 is formed in a roughly rectangular shape extending in the left-right direction when viewed from the front. A power button 21A, multiple buttons 21B, multiple display units 21C, and a fan slit 21D are provided on the front surface of the front wall portion 21. The power button 21A and the multiple buttons 21B are supported so as to be movable in the front-rear direction relative to the front wall portion 21. The display units 21C are provided corresponding to the positions of the indicators 63 and 65 of the electrical circuit boards 52 and 53, respectively, and are formed with seven-segment shaped slits. The fan slit 21D is provided in a position opposite the fan 55, and the fan 55 drives outside air into the operating unit 10. A resin film 29 is attached to the front surface of the front wall portion 21. The resin film 29 holds the power button 21A and the multiple buttons 21B to the front wall portion 21 and protects the front surface of the front wall portion 21. Characters, symbols, patterns, etc. are printed on the resin film 29.

[0028] The right wall portion 22 protrudes rearward from the right end of the front wall portion 21 and is formed in a roughly rectangular shape that is elongated vertically when viewed from the right side. The right wall portion 22 is provided with a pair of upper and lower fixing holes 22A. The fixing holes 22A penetrate the right wall portion 22 in the left-right direction. The left wall portion 23 protrudes rearward from the left end of the front wall portion 21 and is formed in a roughly rectangular shape that is elongated vertically when viewed from the left side. The left wall portion 23 is also provided with a pair of upper and lower fixing holes 23A. The fixing holes 23A penetrate the left wall portion 23 in the left-right direction.

[0029] The upper wall portion 24 protrudes rearward from the upper end of the front wall portion 21 and is formed in a roughly rectangular shape that is long in the left-right direction when viewed from above. The length of the upper wall portion 24 that protrudes rearward is the same as the length of the right wall portion 22 and the left wall portion 23 that protrude rearward. A sheet-like elastic member 24A is fixed to the right rear end of the upper surface of the upper wall portion 24, and a sheet-like elastic member 24B is also fixed to the left rear end of the upper surface of the upper wall portion 24. The elastic members 24A and 24B are made of rubber, but other materials with elasticity may be used. For example, the bottom of the built-in stove 3 comes into contact with the elastic members 24A and 24B. The lower wall portion 25 protrudes rearward from the lower end of the front wall portion 21 and is formed in a roughly rectangular shape that is long in the left-right direction when viewed from below. The length of the lower wall portion 25 that protrudes rearward is shorter than the length of the upper wall portion 24 that protrudes rearward.

[0030] The rear case 30, like the front case 20, is formed in a roughly rectangular shape that is elongated in the left-right direction when viewed from the front, and has the same size as the inner area that opens toward the rear of the front case 20. The rear case 30 is also made of resin. On the back of the front case 20 and the front of the rear case 30, from left to right, are the electrical circuit boards 51-53 and the fan 55. The electrical circuit boards 51-53 and the fan 55 are housed inside a box formed by combining the front case 20 and the rear case 30 in the front-rear direction. Of the electrical circuit boards 51-53, the central electrical circuit board 52 has the longest width in the left-right direction, and the left electrical circuit board 51 has the shortest width in the left-right direction.

[0031] A power switch 61 is provided in the center of the front of the electrical circuit board 51. The power switch 61 corresponds to the position of the power button 21A on the front case 20. A connection terminal 51A is provided at the left end of the front of the electrical circuit board 51. A connection terminal 51B is provided at the upper end of the front of the electrical circuit board 51. Multiple switches 62 and multiple indicators 63 are provided on the front of the electrical circuit board 52. The multiple switches 62 correspond to the positions of the button 21B to the left of the display unit 21C on the front case 20 and the button 21B between the display unit 21C. Each of the indicators 63 is a set of LEDs arranged on the circuit board in a 7-segment pattern, and corresponds to the positions of the multiple display units 21C on the left side of the display unit 21C on the front case 20. A connection terminal 52A is provided on the right side of the upper end of the front of the electrical circuit board 52. Multiple indicators 65 and multiple switches 66 are provided on the front of the electrical circuit board 53. The display unit 65 is also composed of multiple LEDs arranged on the circuit board in a 7-segment pattern, corresponding to the position of the rightmost display unit 21C of the front case 20. The switches 66 correspond to the positions of the multiple buttons 21B located to the right of the display unit 21C of the front case 20. A connection terminal 53A is provided in the upper right corner of the front of the electrical circuit board 53.

[0032] A bulge 32 is provided on the rear surface of the rear case 30, excluding the upper and right ends. The bulge 32 is formed in a roughly rectangular shape that is elongated in the left-right direction when viewed from the rear, and bulges out in a box shape from the rear surface of the rear case 30 toward the rear. The bulge 32 comprises a rear wall 321, an upper wall 322, a right wall 323, a left wall 324, and a lower wall 325. The rear wall 321 is formed in a roughly rectangular shape that is elongated in the left-right direction when viewed from the rear. The rear wall 321 comprises a ventilation slit 37, four boss portions 34, and two mounting claws 35, 36. The ventilation slit 37 is provided on the left end side of the rear wall 321, that is, on the side opposite to where the fan 55 is located. The four boss portions 34 are formed in a short-axis cylindrical shape and are provided at the upper end of the rear surface of the rear wall 321, projecting toward the rear at intervals in the left-right direction. The mounting claws 35, 36 are provided at the lower end of the rear surface of the rear wall 321, at intervals in the left-right direction. The mounting claws 35 and 36 protrude rearward and are bent downward, forming an inverted L-shape in side view. Eight fixing holes 30A are provided in the rear wall 321 at intervals in the left-right direction. Fixing hole 32A penetrates the rear wall 321 in the front-rear direction.

[0033] The upper wall 322 protrudes forward from the upper end of the rear wall 321 and is formed in a roughly elongated, strip-like shape in the left-right direction when viewed from above. The right wall 323 protrudes forward from the right end of the rear wall 321 and is formed in a roughly elongated, strip-like shape extending in the up-down direction when viewed from the right side. The corner where the right end of the upper wall 322 and the upper end of the right wall 323 connect to each other is formed in an arc shape. The left wall 324 protrudes forward from the left end of the rear wall 321 and is formed in a roughly elongated, strip-like shape extending in the up-down direction when viewed from the left side. The lower wall 325 protrudes forward from the rear end of the rear wall 321 and is formed in a roughly elongated, strip-like shape extending in the left-right direction when viewed from below.

[0034] On the rear surface of the rear case 30, an upper section 301 is provided above the bulging section 32, and a right section 302 is provided on the right side. The upper section 301 protrudes upward from the front end of the upper wall 322 of the bulging section 32 and is formed in a substantially rectangular shape that extends in the left-right direction when viewed from the rear. The right section 302 protrudes to the right from the front end of the right wall 323 of the bulging section 32 and is formed in a substantially rectangular shape that extends in the up-down direction when viewed from the rear. The right end of the upper section 301 and the upper end of the right section 302 are connected perpendicularly to each other. The rear surfaces of the upper section 301 and the right section 302 are recessed in front of the rear surface of the rear wall 321 of the bulging section 32. A stepped section 33 is provided on the left side of the rear surface of the upper section 301. The stepped section 33 protrudes backward in a box shape. The length of the stepped section 33 in the front-rear direction is shorter than the length of the upper wall 322 of the bulging section 32 in the front-rear direction.

[0035] Opening grooves 311 and 312 are provided at the upper end of the upper portion 301. Opening groove 311 corresponds to the position of the connection terminal 53A of the electrical circuit board 53. Opening groove 312 corresponds to the position of the connection terminal 52A of the electrical circuit board 52. Opening groove 313 is provided at the upper end of the stepped portion 33. Opening groove 313 corresponds to the position of the connection terminal 51A of the electrical circuit board 51. Opening groove 314 is provided at the front end of the left wall 324 of the bulging portion 32. Opening groove 314 corresponds to the position of the connection terminal 51A of the electrical circuit board 51. Opening grooves 311 to 313 are formed in a horizontally elongated slit shape when viewed from the rear. Opening groove 314 is formed in a vertically elongated slit shape when viewed from the rear. Four fixing holes 30B are provided in the upper portion 301 and the stepped portion 33, spaced apart in the left-right direction. The fixing holes 30B penetrate the upper portion 301 and the stepped portion 33 in the front-rear direction.

[0036] Harnesses 91-94 are bundles of multiple wires. The number of wires bundled into harnesses 91-94 is arbitrary. One end of harness 91 is provided with terminal 91A, and the other end is positioned to extend towards the rear. One end of harness 92 is provided with terminal 92A, and the other end is connected to terminal 91A along with one end of harness 91. One end of harness 93 is provided with terminal 93A, and the other end is connected to terminal 92A along with one end of harness 92. One end of harness 94 is provided with terminal 94A, and the other end is positioned to extend towards the rear.

[0037] The assembly of the control unit 10 will now be described. The fan 55 is fixed to the rear right end of the front case 20 with two screws. Terminals 94A, 93A, 92A, and 91A of harnesses 91 to 94 are connected to connection terminals 51A, 51B, 52A, and 53A of electrical circuit boards 51 to 53, respectively. Electrical circuit boards 51 to 53 are located on the front side of the rear case 30. Harnesses 91 to 93 are pulled out to the rear of the rear case 30 via opening grooves 311, 312, and 313 and fixed to the rear of the upper part 301 and right part 302 with multiple clips. Harness 94 is pulled out to the rear of the rear case 30 via opening groove 314. The rear case 30 is inserted into the inside of the front case 20 from the rear, and the signal wires (not shown) of the fan 55 are connected to the electrical circuit board 53. The front case 20 and the rear case 30 are fastened together with multiple screws, along with the electrical circuit boards 51-53 housed inside. The other ends of harness 91 and harness 94 are positioned to extend rearward from the right and left ends of the rear case 30, respectively. A power button 21A and several buttons 21B are placed on the front wall 21 of the front case 20, and a resin film 29 is attached to it to assemble the operating unit 10.

[0038] The installation of the control unit 10 will now be described. The assembled control unit 10 is attached to the mounting plate 7 from the front. The other end of the harness 91, which is positioned towards the rear from the right end of the rear case 30, is inserted into the main body 2 through the right harness opening 76 of the mounting plate 7. The other end of the harness 94, which is positioned towards the rear from the left end of the rear case 30, is inserted into the main body 2 through the left harness opening 77 of the mounting plate 7. The other ends of the harnesses 91 and 94 are connected directly to a controller (not shown) provided inside the main body 2, or via other wiring.

[0039] Mounting claws 35 and 36, provided on the rear of the rear case 30, are locked into locking holes 78 and 79, respectively, provided in the main body portion 71 of the mounting plate portion 7. The operating unit 10 is positioned vertically and horizontally relative to the mounting plate portion 7 by the portion of the mounting claws 35 and 36 that protrudes to the rear and is hooked onto the lower edge of the locking holes 78 and 79. The operating unit 10 is also positioned in the front-rear direction by the upper part rotating vertically backward around the mounting claws 35 and 36 as axes, causing the boss portion 34 of the rear case 30 to contact the mounting plate portion 7. The right wall portion 22 and the left wall portion 23 of the front case 20 are positioned outside the right extension portion 72 and the left extension portion 73 of the mounting plate portion 7, respectively. Two screws 14 (see Figure 3) are fastened from the right side of the operating unit 10 through fixing holes 22A in the right wall portion 22 of the front case 20 to fixing holes 72A in the right extension portion 72 of the mounting plate portion 7. Also, two screws 15 (see Figure 3) are fastened from the left side of the operating unit 10 through fixing holes 23A in the left wall portion 23 of the front case 20 to fixing holes 73A in the right extension portion 72 of the mounting plate portion 7. In this way, the operating unit 10 is fixed to the gas oven 1 via the mounting plate portion 7 (see Figure 2).

[0040] Next, the control unit 10 and the mounting plate 7 will be described. As shown in Figures 6 and 7, with the control unit 10 fixed to the gas oven 1, the mounting plate 7 is positioned to cover the rear and bottom surfaces of the rear case 30 of the control unit 10 from the rear and below. That is, the rear wall 321 and the back surface of the upper part 301 of the bulge 32 of the rear case 30 face the front surface of the main body 71 of the mounting plate 7. Also, the bottom surface of the lower wall 325 of the bulge 32 of the rear case 30 faces the upper surface of the lower projection 75 of the mounting plate 7. The control unit 10 is heated from the rear through the main body 2 by the heat from the baking chamber 5 when the gas oven 1 is used. The control unit 10 is also heated from below by the heat from the baking chamber 5 when the oven door 6 is opened and closed. The mounting plate 7 is positioned between the operating unit 10 and the main body 2 of the gas oven 1 so that the operating unit 10 is less likely to be directly affected by heat, and covers the back and bottom surfaces of the operating unit 10, thereby blocking radiant heat from the main body 2. Therefore, the rise in the surface temperature of the rear case 30 is suppressed, and the operating unit 10 can protect the electrical circuit boards 51-53 from heat.

[0041] The rear case 30 has four bosses 34 on the back surface of the rear wall 321 of the bulging portion 32 that contact the main body 71 of the mounting plate portion 7, forming a gap D1 in the front-rear direction between the rear wall 321 and the main body 71. In addition, the rear case 30 has mounting claws 35 and 36 that are positioned vertically by locking holes 78 and 79, forming a vertical gap D2 between the lower wall 325 of the bulging portion 32 and the lower protrusion 75 of the mounting plate portion 7. With this configuration, an air layer is formed in the gaps D1 and D2 between the mounting plate portion 7 and the rear case 30. Even if the temperature of the mounting plate portion 7 rises due to radiant heat from the main body portion 2, the air layer in the gaps D1 and D2 blocks the heat, making it difficult for heat to be conducted to the rear case 30 and, consequently, to the operating portion 10. Therefore, the rise in the surface temperature of the rear case 30 is suppressed, and the operating portion 10 can protect the electrical circuit boards 51 to 53 from heat.

[0042] Furthermore, the lower wall 325 of the rear case 30 bends downward at its front end, forming a bent portion 326 that extends beyond the length of the gap D2. The front of the bent portion 326 abuts against the rear end of the lower wall portion 25 of the front case 20, and its lower end is located slightly above the bottom surface of the lower wall portion 25. The length of the lower projection 75 of the mounting plate portion 7 that protrudes from the lower end of the main body portion 71 is adjusted so that its front end is located behind the rear of the bent portion 326. Consequently, a communication portion T2 is formed between the front end of the lower projection 75 and the rear of the bent portion 326, opening vertically and connecting the inside and outside of the gap D2. That is, the opening of the communication portion T2 opens downward toward the operating portion 10. Therefore, when the user looks down at the operating portion 10 from their eye level, the opening of the communication portion T2 is difficult to see. In the gas oven 1, the upper end of the oven door 6 is located below the control unit 10, and a gap D4 is provided between the lower surface of the control unit 10 and the upper surface of the upper end of the oven door 6 for opening and closing.

[0043] Furthermore, the vertical length of the mounting plate portion 7 is adjusted so that the upper end of the main body portion 71 is located below the upper end of the rear case 30, i.e., below the upper end of the upper side portion 301. Also, the upper wall portion 24 of the front case 20 protrudes rearward, and when the rear case 30 is assembled to the front case 20, its protruding length is approximately the same as the width of the gap D1 as the back surface of the rear wall 321 of the bulging portion 32. The rear case 30 is assembled to the front case 20 so that the upper end of the upper side portion 301 abuts against the bottom surface of the upper wall portion 24. The gap D1 is vertically connected to the space portion where the harnesses 91-93 are arranged, which is formed behind the upper side portion 301 of the rear case 30 and below the upper wall portion 24 of the front case 20. Also, the rear end of the upper wall portion 24 of the front case 20 is located above the upper end of the main body portion 71 of the mounting plate portion 7. The gap between the rear end of the upper wall portion 24 and the upper end of the main body portion 71 connects the space behind the upper side portion 301 and below the upper wall portion 24 to the outside in the front-rear direction. The space behind the upper side portion 301 and below the upper wall portion 24 functions as a communication portion T1 that connects the inside of the gap D1 to the outside. Therefore, the gap between the rear end of the upper wall portion 24 and the upper end of the main body portion 71 is the opening portion of the communication portion T1 that opens outwards, and it opens towards the rear of the operating section 10. Thus, when the user looks down at the operating section 10 from their eye level, the opening portion of the communication portion T1 is difficult to see. Furthermore, in the gas oven 1, the built-in cooktop 3 is positioned above the main body portion 2, and its bottom is placed on the elastic members 24A and 24B, so a gap D3 is provided between the upper projection 74 of the mounting plate portion 7 and the bottom of the built-in cooktop 3. In Figure 6, the gap D3 is shown with a size that takes into account the heights of the elastic members 24A and 24B, which are not shown.

[0044] With this configuration, the gas oven 1 can take in air from the front side of the gas oven 1 through the gap D4, pass it through the communication section T2, and allow it to flow into the gap D2 between the lower wall 325 and the lower projection 75. The gas oven 1 can also discharge the air in the gap D1 between the rear wall 321 and the main body 71 by passing it through the communication section T1 and allowing it to escape to the gap D3 on the rear side of the operating section 10. The gaps D1 and D2 are in communication. In other words, the operating section 10 and the mounting plate section 7 form an airflow path R through which air from the front side of the gas oven 1 passes through the gaps D2 and D1 via the communication section T2 at the bottom of the operating section 10 and is discharged via the communication section T1. In this way, the connecting sections T1, T2 and gaps D1, D2 connect to form a flow path R, so that the air in gaps D1, D2, which is heated by the mounting plate 7, becomes hotter than the outside air that comes into contact with it through the connecting sections T1, T2. As a result, a density difference is created in the flow path R between the air on the side in contact with the outside and the air heated by the mounting plate 7, causing the air in the flow path R to rise. The air that has risen in the flow path R is discharged to the outside through the connecting section T1 and gap D3, and this creates a pressure difference in the flow path R, so that the cold air from outside the gas oven 1 is drawn into the flow path R through gap D4 and connecting section T2. ​​In this way, by connecting the connecting sections T1, T2 and gaps D1, D2 to form a flow path R through which air can pass, a chimney effect is created, and the temperature inside gaps D1, D2 can be kept low by the cold air from outside the gas oven 1. Therefore, heat transfer from the mounting plate 7 to the rear case 30 due to convection within the gaps D1 and D2 is suppressed, and the rise in the surface temperature of the rear case 30 is suppressed. Thus, the gas oven 1 can prevent thermal damage to the electrical circuit boards 51 to 53 housed between the front case 20 and the rear case 30.

[0045] As explained above, since at least a portion of the rear wall 321 and the lower wall 325 of the rear case 30 is covered by the mounting plate portion 7, the rise in the surface temperature of the rear case 30 is suppressed, and the electrical circuit boards 51 to 53 can be protected from heat.

[0046] Since an air layer is formed in the gaps D1 and D2 between the rear wall 321 and the lower wall 325 of the rear case 30 and the main body portion 71 and the lower protruding portion 75 of the mounting plate portion 7, the rise in surface temperature of the rear case 30 is further suppressed, and the electrical circuit boards 51 to 53 can be protected from heat.

[0047] The upper end of the rear wall 321 and the front end of the lower wall 325 of the rear case 30, and the upper end of the main body 71 and the front end of the lower projection 75 of the mounting plate 7, respectively, connect the gaps D1 and D2 to the outside. As a result, the connecting portion T1, gaps D1 and D2, and the connecting portion T2 function as a flow path R through which air can pass between the operating section 10 and the mounting plate 7, and the chimney effect allows air to circulate within gaps D1 and D2. Therefore, the rise in surface temperature of the rear case 30 can be further suppressed, and the electrical circuit boards 51-53 can be protected from heat.

[0048] The opening of the communication section T1 faces towards the rear of the control section 10, and the opening of the communication section T2 faces downwards towards the control section 10. Since the openings are not easily visible when the user looks down at the control section 10 from their eye level, the gas oven 1 can maintain an aesthetically pleasing appearance.

[0049] In the above description, the main body portion 71 is an example of the "back wall portion" of the present invention. The lower protruding portion 75 is an example of the "bottom wall portion" of the present invention. The front wall portion 21 is an example of the "front portion" of the present invention. The left wall portion 23 and the right wall portion 22 are examples of the "left and right side wall portions" of the present invention. The upper wall portion 24 is an example of the "top surface portion" of the present invention. The rear wall 321 is an example of the "rear surface portion" of the present invention. The lower wall 325 is an example of the "bottom surface portion" of the present invention. The gaps D1 and D2 are examples of the "first gap" and "second gap" of the present invention. The connecting portions T1 and T2 are examples of the "first connecting portion" and "second connecting portion" of the present invention.

[0050] The present invention is not limited to the above embodiments, and various modifications are possible. The boss portion 34 may not be provided on the rear case 30, but on the mounting plate portion 7, or the gap D1 may be formed even without the boss portion 34 when the operating portion 10 is fixed to the mounting plate portion 7. The upper portion 301 may not be provided on the rear case 30, and the rear wall 321 of the bulging portion 32 may extend to the upper end of the rear case 30 and abut against the bottom surface of the upper wall portion 24 when assembled to the front case 20. The rear end of the upper wall portion 24 may be at the same position in the front-rear direction as the back surface of the rear wall 321, in which case the opening portion of the communication portion T1 may face upwards towards the gas oven 1. The front end of the lower projection 75 of the mounting plate portion 7 may extend forward beyond the front end of the rear case 30. In addition, the bent portion 326 of the rear case 30 may be omitted, and the bottom surface of the lower wall 325 may be at the same height as the bottom surface of the lower wall portion 25 of the front case 20. In this case, the front end of the lower projection 75 may extend to approximately the same position in the front-rear direction as the front wall portion 21 of the front case 20. The opening portion of the communication portion T2 may be configured to face the front of the gas oven 1. The main body portion 71 and the lower projection 75 of the mounting plate portion 7 cover a part of the back surface and a part of the bottom surface of the rear case 30, respectively, but they may also be configured to cover the entire back surface and the entire bottom surface of the rear case 30. In this case, a hole-like opening or a notched recess may be formed at the upper end of the main body portion 71 and the front end of the lower projection 75, and these may function as communication portions T1 and T2, respectively. [Explanation of Symbols]

[0051] 1. Gas oven 5. Firing chamber 5A opening 6 Oven door 7 Mounting plate section 10 Control section 20 Previous Cases 21 Front wall 21B button 22 Right wall section 23 Left wall section 24 Upper wall 30 Rear Case 51, 52, 53 Electrical circuit board 71 Main body 75 Lower protrusion 91,92,93,94 ハーネス 321 Rear wall 325 lower wall Gap between D1 and D2 Connecting parts of T1 and T2

Claims

1. A gas oven comprising: a baking chamber having an opening on the front side; an oven door provided on the front side of the baking chamber so as to be able to open and close vertically with its lower end as an axis, and which closes the opening when closed; and an operating unit fixed above the oven door and above the opening of the baking chamber, and electrically connected to a controller via a harness, Above the opening of the firing chamber, a metal mounting plate is provided, having at least a back wall portion whose surface direction faces forward, and a bottom wall portion extending forward from the lower end of the back wall portion and whose surface direction faces upward. The aforementioned operating unit is A resin front case comprising a front section fixed to the mounting plate and equipped with an operation button, left and right side sections extending rearward from both left and right ends of the front section, and a top section extending rearward from the upper end of the front section and connecting to the left and right side sections, A rear case made of resin, which is fixed to the rear of the front case, comprises a rear section positioned behind the front section and a bottom section extending forward from the lower end of the rear section. One or more electrical circuit boards housed between the front case and the rear case Equipped with, With the aforementioned front case fixed to the mounting plate portion, The rear wall portion of the mounting plate portion covers at least a part of the rear portion of the rear case from the rear side. Furthermore, the bottom wall portion of the mounting plate portion covers at least a part of the bottom surface portion of the rear case from below. A gas oven characterized by [feature].

2. The back wall portion of the mounting plate portion is positioned with a predetermined first gap between it and the rear portion of the rear case, Furthermore, the bottom wall portion of the mounting plate portion is positioned with a predetermined second gap between it and the bottom surface portion of the rear case. A gas oven according to claim 1, characterized by the following:

3. Between the upper end of the rear portion of the rear case and the upper end of the back wall portion of the mounting plate, there is a first communication portion that connects the first gap to the outside. Between the front end of the bottom surface portion of the rear case and the front end of the bottom wall portion of the mounting plate portion, there is a second communication portion that connects the second gap to the outside. The first gap and the second gap are in communication, and through the first and second communication sections, respectively, they form a passage through which air can pass between the operating section and the mounting plate section. The gas oven according to claim 2, characterized by the following:

4. The first communication section has an opening that connects the first gap to the outside, with the opening facing the rear of the operating section. The second communication section has an opening that connects the second gap to the outside, with the opening facing downwards from the operating section. A gas oven according to claim 3, characterized by the following:

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