JP3501480B2 - Door structure used for heat treatment equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a door used for heating and cooking equipment such as a microwave oven.

[0002]

2. Description of the Related Art When heat treatment is carried out by a heating device such as a microwave oven, it is necessary to prevent microwaves, which are a heat source, and hot air from leaking to the outside of a heating chamber. For this reason, it is desired that the door that closes the inlet of the heating chamber completely prevents such a heat source from leaking outside. However,
In the conventional door structure, since the door that is locked by using only the door hook is used, it cannot be said that the leakage prevention function is sufficiently exerted.

[0003]

By improving the door structure, the function of preventing leakage of the heating source when the door is locked is strengthened.

[0004]

According to the present invention, a door structure for closing a heating chamber entrance of a heating device for hot air heating or microwave heating is provided with an outer door structure having a door locking mechanism. An inner door structure that prevents leakage of hot air or microwaves, the inner door structure having a door contact plate that abuts a heating chamber front plate, and the outer door structure and the inner door. The inner door structure is supported by the leaf spring with respect to the outer door structure by connecting the structure with a leaf spring, and at the same time, the outer door structure is repulsed by the leaf spring. Between the inner door structure and the inner door structure, a force having elasticity is applied in a direction in which the both door structures are separated from each other, so that the outer door structure has the elasticity when the door is locked. Against the applied force against the outer door structure Door structure, characterized in that the door structure is the door per plate obtained relative movement allowed the copying contact to the heating chamber front plate is provided. According to one embodiment of the present invention, by providing a packing in the entire peripheral end region of the outer door structure facing the heating chamber front plate, the inner peripheral edge of the packing, the outer periphery of the door contact plate, The door contact plate is connected to allow movement of the plate, and the packing is configured to prevent leakage of hot air from the inlet of the heating chamber when the door is locked by the outer door structure. According to another embodiment of the present invention, the inner door structure is provided with a choke groove behind the door contact plate to prevent microwave leakage.

[0005]

The leaf spring connecting the outer door structure and the inner door structure separates the two door structures from each other at a predetermined interval by the repulsive force of the leaf spring when the door is opened. The distance from the outer door structure that can be formed when the door is locked to the front plate of the heating chamber is large enough to sandwich the inner door structure between them, but it was caused by the repulsive force of the spring. The above-mentioned predetermined interval is not large enough to be acceptable.
Therefore, since the spring must be compressed when the door is locked, the repulsive force of the spring is added to the force for pushing the inner structure toward the heating chamber. Also, the elasticity of the spring allows the inner door structure to move relative to the outer door structure, thus allowing a conformal contact with the heating chamber front plate. By the action of these springs, the contact between the inner door structure and the heating chamber front plate is made favorable, and the function of preventing leakage of microwaves and hot air can be enhanced. Further, by providing a packing between the outer door structure and the front inner door structure, movement of the door contact plate is allowed,
It is possible to further improve the hit and enhance the leak prevention function.

[0006]

1 and 2 show schematic perspective views of a heat treatment apparatus according to an embodiment of the present invention, and further, FIGS.
2 shows sectional views taken along lines II, II-II, and III-III of FIG. 2, respectively. Note that Fig. 1 shows when the door is locked.
FIG. 2 shows the open state. The door can be locked by two door hooks 3 provided inside the door, as in the conventional case. As is clear from the figure, the door structure according to the present invention has a double structure. In the following description, the outer structure will be referred to as an outer door structure and the inner structure will be referred to as an inner door structure. The outer door structure is a door exterior 2 that defines the exterior of the door.
And a door handle 1 provided outside the door exterior 2,
A door frame 9 provided inside the door exterior 2, a door hook 3 for locking the door, and a door hook base 11 and a tension coil spring 6 for movably attaching the door hook 3 to the door frame 9. To be done. The outer door structure plays an important role mainly as a door locking mechanism. The attachment of the door hook 3 is the same as the conventional one. It should be noted that the door hook 3 is provided on the outer door structure, not the inner door structure.

The inner door structure has a choke groove A (7) for preventing microwave leakage and a choke groove B (8).
And a plate 5 per door. The inner door structure plays an important role mainly in preventing leakage.
These door structures are flexibly connected to each other by the leaf springs 4 attached to the four sides of the inner door structure. Spring 4
The repulsive force of gives a force having elasticity in the direction of separating the two door structures from each other, and the flexible connection by the spring 4 is
Allows the inner door structure to move independently of the outer door structure. The spring 4 which separates the two door structures from each other serves to complete the close contact of the inner door structure with the heating chamber. The door hook 3 provided in the outer door structure engages with the hole 13 in the front plate of the cooking device when the door is locked, and the door is held in the closed position. The distance from the outer door structure formed at this time to the inlet of the heating chamber 14 is large enough to sandwich the inner door structure, but is large enough to allow a predetermined interval generated by the repulsive force of the spring 4. Not a thing. As a result, the close contact between the inner door structure and the inlet of the heating chamber 14 becomes stronger, and the microwave and hot air leakage prevention function of the inner door structure is enhanced.

The flexible connection by the spring 4 allows the inner door structure to move independently of the outer door structure within the tolerance range of the spring 4. The outer door structure is firmly fixed to the door exterior 2 and the door handle 1, and its movement depends only on the movement of these members. On the other hand, since the inner door structure is flexibly connected to these members including the outer door structure by the spring 4, the inner door structure moves following the distortion and deformation of the heating and cooking equipment. As a result, the leak prevention function is further enhanced. This leakage prevention function is enhanced not only against microwaves but also against hot air by providing the packing 10 in the entire peripheral end region of the inner door structure.
The packing 10 has, on one side thereof, an entire peripheral end region of the door contact plate 5 forming part of the inner door structure, and on the other side of the inside of the door frame 9 forming part of the outer door structure. It is fixed to the entire circumference end area. Since the packing 10 gives a sufficient expansion allowance between both door structures, even if the inner door structure moves with respect to the outer door structure, leakage of hot air in the heating chamber 14 can be effectively prevented. . The function of this packing is the same as that of the spring 4 described above. Therefore, packing 1
Even with 0, as in the case of the spring 4, the adhesion to the heating front plate is strengthened.

[0009]

According to the present invention, the inner door structure moves independently and flexibly from the outer door structure by the action of the spring and the packing for connecting the outer door structure and the inner door structure. In addition, the inner door structure can be more flexibly and closely contacted with the heating chamber by the action of the spring, so that the leakage of the heating source can be effectively prevented.

[Brief description of drawings]

FIG. 1 is a perspective view of a heat treatment apparatus of the present invention.

FIG. 2 is a perspective view of the heat treatment apparatus of the present invention when the door is opened.

3 is a cross-sectional view taken along the line I-I of the door portion of the heat treatment apparatus of FIG.

FIG. 4 is a cross-sectional view taken along the line II-II of the door of the heat treatment device shown in FIG.

5 is a cross-sectional view taken along the line III-III of the door portion of the heat treatment apparatus of FIG.

[Explanation of symbols]

1 Door handle 2 door exterior 3 door hook 4 leaf spring 5 Door per plate 6 tension coil spring 7 Choke groove A 8 choke groove B 9 door frame 10 packing 11 door hook base 13 holes 14 heating chamber

─────────────────────────────────────────────────── --- Continuation of the front page (56) Reference JP-A-50-112838 (JP, A) JP-A-6-147494 (JP, A) JP-A61-32391 (JP, A) JP-A-57- 189494 (JP, A) Actual development 56-105296 (JP, U) Actual development 59-126491 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) F24C 7/02 521 F24C 15/02

Claims (3)

(57) [Claims] 1. A door structure for closing a heating chamber inlet of a heating device for hot air heating or microwave heating, and an outer door structure having a door locking mechanism, and preventing leakage of hot air or microwaves. An inner door structure is provided, and the inner door structure has a door contact plate that abuts a heating chamber front plate, and a leaf spring is provided between the outer door structure and the inner door structure. The inner door structure is connected by the leaf spring.
Is supported with respect to the outer door structure, and at the same time, the repulsive force of the leaf spring causes an elastic force between the outer door structure and the inner door structure in a direction in which both door structures are separated from each other. When the outer door structure is locked by the outer door structure, the inner door structure is relatively moved with respect to the outer door structure when the door is locked by the outer door structure. A door structure, wherein the door contact plate is capable of following the contact with the heating chamber front plate. 2. A packing is provided in an entire peripheral end region of the outer door structure facing the heating chamber front plate, and an inner peripheral edge of the packing is moved to an outer periphery of the door contact plate, and the door contact plate is moved. The door structure according to claim 1, wherein the packing prevents leakage of hot air from the inlet of the heating chamber when the door is locked by the outer door structure. 3. The door structure according to claim 1, wherein the inner door structure is provided with a choke groove behind the door contact plate to prevent microwave leakage.