JPS5938487B2 - Oven insulation device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The object of the present invention is to improve the heat insulation mechanism of an oven.

In order to effectively use electric or gas fired power, it is necessary to provide an efficient heat insulation mechanism to the heating chamber of the oven.

Conventionally, the best method (which has been used) is to use cotton fibers made of glass fiber or ceramic fiber as the insulation material, and to cover the surface of the insulation material with a box made of aluminized steel plate for the purpose of retaining this material and reflecting heat. It was covered.

The disadvantage of this method is that, first, since it is made into a box, the thickness of the aluminized steel plate becomes thicker, which not only makes it heavier (and more expensive), but also increases its heat capacity, which reduces the essential thermal efficiency.

Second, a large mold is required to form the box, and assembly is not always easy.

The present invention aims to improve these two points and realize a low-cost and efficient heat insulation mechanism.

An embodiment of the present invention will be described below with reference to the drawings.

1. Although the heating chamber of the oven is not shown, it has the shape and dimensions that are widely used in currently commercially available microwave ovens with ovens.

In other words, the width is 32 mm made of stainless steel plate with a thickness of 0.4 mm.
0 fights, depth 325 yrutt.

Height 250711. It is assumed that a truncated cone-shaped turntable aperture with a depth of 20 blades is provided on the bottom surface.

FIG. 1 is an exploded perspective view of a heat insulating board made of an aluminized steel plate with a thickness of 0.4 mm before assembly.

Consists of three types of insulation boards: 1 on the insulation board, 2 on the side of the insulation board,
This is the bottom 3 of the insulation board.

The top of the heat insulating board consists of a top surface 11 with a width of 340 m and a depth of 320 m, a bent part 12 of about 5 mm, and a left and right bent part 13 of 30 g.A hole 14 for a heater is provided on the top surface, and a hole 14 for a heater is provided in the center of the left and right bent part. The section is provided with an inclined aperture 15 whose upper part is cut off.

The insulation board side 2 has a depth of 32 on and a height of 31 om.
It consists of a front and rear bent portion 22 with a width of 5 TIJ, a lower bent portion 23 with a width of 5 TIJ, and an upper bent portion 24 with a width of 20 TIJ.

A concave hole 25 is provided in the upper center of the side surface 21.

Also, 3 x 550 long hole 26 at position 507n and 71 from the bottom.
Place 4 of them in a straight line at intervals of 20.

The front and rear bent portions 22 are also cut out at right angles at 50 points from the bottom.

A hole 27 having the same shape as the hole 25 is made on the left and right sides slightly above the elongated hole 26.

However, this hole has a concave shape.

Moreover, the left and right sides of the heat insulating plate side surfaces 2 have the same shape.

Next, the bottom of the insulation board 3 has a width of 340 mm and a depth of 155 mm, and the bottom surface 31.
Left and right bending part 32 with a width of 307nJn and a width of 5rL111
It consists of front and rear bent portions 33.

A diaphragm 34 having the same shape as the slanted diaphragm 15 is provided in the left and right bent portion 32 .

However, the direction of inclination and the position of separation are opposite to 15.

This cross-sectional shape is shown in FIG. The concave holes 25 and 2
The detailed shape of the diaphragm 7 is shown in FIG. 3, and the detailed view of the inclined apertures 15 and 34 is shown in FIG.
shall be.

Further, the aperture 15 and the hole 25 are both provided at the center of the depth of 320 blades, and the distances of the hole 27 and the aperture 34 from the end face are the same.

FIG. 5 is an exploded perspective view showing the structure of a heat insulating material made of a cotton-like material made of glass fiber, and is composed of an upper insulating material 4, a side insulating material 5, and a lower insulating material 6.

All insulation has a nominal thickness of 107rIjn and the insulation top 4 has a width of 340. ．． It is attached to the inside of the heat insulating board top 1 with a depth of 320 rL111.

The heat insulating material side face 5 has a depth of 320M and a height of 310rL1n, and is mounted inside the heat insulating plate side face.

The lower heat insulating material 6 has a width of 240rnjIl and a depth of 155wn, and is installed inside the lower part of the heat insulating board.

In addition, the area under the insulation board and insulation material is not just a rectangle.
As shown in FIGS. 1 and 5, one side is cut into a trapezoidal shape in order to avoid the truncated conical diaphragm provided on the bottom surface of the heating chamber.

Next, a method for attaching and fixing the heat insulating board and the heat insulating material to the heating chamber will be described.

First, the side surface of the heat insulating plate and the side surface of the heat insulating material are bent at a position of 50W from the bottom in both FIGS. It is in an unbent state.

This is attached to the left and right sides of the heating chamber so that the heat insulating material side 5 is sandwiched between the heating chamber and the heat insulating board side 2, and the heat insulating material top 4 is placed on the top surface of the heating chamber, and the heat insulating board top 1 is placed on top of it. Place it on top and press down.

The aperture 15 and the concave hole 25 fit together with a clicking sound, and cannot be removed.

Next, both the side surface of the heat insulating material and the side surface of the heat insulating plate are bent at the position of the elongated hole 26.

Then, press the bottom of the insulation board with the bottom insulation material attached from the bottom to the top.

The hole 27 and the aperture 34 fit together with a clicking sound.

Now, I described assembling the insulation mechanism very easily, but there is a prerequisite for this.

The point is that the heat insulating material has elasticity.

In other words, cotton-like insulation material has a nominal weight of 10g, but in its natural state it has a thickness of about 10 mm, and when compressed it is 3~4U.
However, when the compression is released, it returns to almost its original thickness.

When the width of the heating chamber is 320 Tun, and the heat insulating material side faces 5 and the heat insulating plate side faces 2 are installed on the left and right sides, the distance between the two heat insulating plate side faces is about 350 rrun in a natural state.

When installing from above a heat insulating board with a width of 340 mm, compress the left and right sides of the heat insulating board to a state of 340 mm or less.

The side surface of the heat insulating material sandwiched between the heating chamber and the side surface of the heat insulating plate is elastic, and due to the force that tends to return to its original state, the fitting between the hole 27 and the aperture 34 shown in FIGS. 3 and 4 is as follows. It is preserved without being unraveled.

When insulating the bottom of the heating chamber by removing the truncated conical aperture for the turntable, the simple idea is to place a circular shape slightly larger than the truncated cone in the center of the square-shaped insulation material and insulation plate. It would be normal to make a hole.

In this case, the heat insulating material and the heat insulating board in the circular hole portion will simply be scrapped, which raises questions from the perspective of resource conservation.

In this respect, according to this embodiment, the heat insulating material and the heat insulating board can be used without waste.

In addition, in the above embodiment, the holes 25 and 27 are formed on the side of the heat insulating board.
Although the apertures 15 and 34 are provided above and below the heat insulating board, respectively, it is clear that the effect is the same even if the holes and the apertures are provided in opposite positions.

In addition, the holes and apertures were made in the shapes shown in Figures 3 and 4, but since the fit is fine as long as they cannot be easily unraveled, if we were to criticize the decrease in reliability, we would like to replace the holes in Figure 3 with the shapes shown in Figures 4. It is also effective to use the convex portion in FIG. 1 in place of the concave portion in FIG. 6 and the aperture in FIG. 4.

As described above, according to the present invention, a heat insulating mechanism can be assembled very easily, and a heat insulating plate as thin as 0.47 u2 can be used, so an efficient oven with a small heat capacity can be realized.

[Brief explanation of the drawing]

Fig. 1 shows an embodiment of the present invention; Fig. 2 is an exploded perspective view of a heat insulating board; Fig. 2 is a sectional view taken along line A-A' in Fig. 1; and Fig. 3 is a main part hole 25 of the heat insulating board. FIG. 4 is a front view of the main part diaphragm 15, FIG. 5 is an exploded perspective view of the heat insulating material, and FIG.
Figure a is a front view showing another example of the hole 25, b is a cross-sectional view taken along line B-1 in a, Figure 7a is a front view showing still another example of the hole 25, and b is a line c-c in a. 'It is a line cross-sectional view. 2...Insulation board, 5...Insulation material, 1,3
...... U-shaped metal fitting, 25, 27... Concave portion (hole), 15, 34... Convex portion.

Claims (1)

[Claims] 1. A heat insulating plate is attached to two mutually parallel surfaces of a substantially rectangular heating chamber, and an elastic heat insulating material is inserted between the heat insulating plate and the side surface of the heating chamber to form a substantially U-shaped heating chamber. A heat insulating device for an oven, characterized in that the two heat insulating plates are sandwiched between two metal fittings, and a convex portion is provided on one side and a concave portion on the other side at corresponding positions between the heat insulating plate and the metal fittings. 2. The oven insulation device according to claim 1, characterized in that a heat insulating material is sandwiched between the U-shaped metal fitting and the heating chamber.