JPS6155885A - Door unit of high frequency heater - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to the structure of a door in a high frequency heating device such as a microwave oven.

Conventional structure and its problems The door structure of a high-frequency heating device such as a microwave oven has a central part with a large number of pores large enough to prevent high-frequency leakage in order to see through the inside of the heating chamber; The main body is a gold-plated part that is integrally formed with a frame part surrounding it that houses a high-frequency attenuation device.The high-frequency attenuation device is usually located on the back side of the door, and is located on the front side of the heating chamber. It comes into contact with the peripheral front plate of the storage opening, but when the door is opened, the back side has openings and slits that introduce high frequency waves, making it unsightly and preventing water vapor and dust from entering. For this reason, this part is covered with a resin cover. Is the metal front important for ease of cleaning and design? i
covered with a transparent flat plate such as glass or resin plate,
In order to hold this integrally with the metal part, it is common to further provide a frame cover made of resin or metal plate.

According to this configuration, screws or the like are used to fix the rear resin cover of the door to metal and the front transparent plate and frame cover to the gold plated part, or the back and frame cover are fixed to the metal part. At the time of resin molding, hook claws, etc. are formed at the same time, holes, cut-outs, etc. are partially processed on the outer periphery of the metal frame, and the hooks are engaged with these holes, cut-outs, etc. to hold the metal frame fixed. Methods such as doing this were used.

If the front surface is covered with transparent glass, it should be more heat resistant than a transparent resin plate, free from scratches (1!i, etc.) on the surface, ensure flatness over a wide area, and have an excellent appearance. However, in order to prevent the chipping and cracking that are likely to occur when the 0111 part of the glass comes into direct contact with a metal object, special structural measures are required for the frame cover, making it difficult to mold the frame cover, and Another disadvantage is that it is expensive.Furthermore, with screws, etc., the fixation must be removed during repair services, but depending on the frequency of removal, metal screws, etc. It is easy to cause the so-called screw looseness (and it is difficult to securely fix it due to the tool groove of the screw head being slopped).
There was a risk that the closeness of the door to the front and back of the main body could not be ensured, which could easily lead to high frequency leakage. In addition, many methods of simultaneously forming the hooking pawl with resin hide the continuous pawl part from view, and the engaging part of the pawl is not visible during assembly, so it is difficult to properly engage the pawl. There were drawbacks such as the possibility of breakage of the claw portion, and the inability to securely hold and fix the device.

Purpose of the Invention The present invention solves the above-mentioned drawbacks of the conventional art.It is possible to securely hold and fix each part that makes up the door, and there is no problem when removing and reassembling the door, and the work is simple and inexpensive. The purpose is to provide a door structure for a high-frequency heating device that can be used.

Structure of the Invention In order to achieve the above object, the door of the high-frequency heating device of the present invention has a built-in high-frequency attenuation device in the peripheral frame, and a large number of pores in the center that prevent high-frequency leakage and allow the inside of the heating chamber to be seen through. It consists of a three-layer structure consisting of a metal N door main body with a heat-resistant rubber, a resin cover that covers the back side of the high-frequency attenuation device, and a transparent flat plate that covers the front side of the metal N door main body. A band-shaped holding body is formed into a ring shape that is slightly smaller than the outer circumference of the metal frame, and is placed over the outer circumference of the three-layer structure to hold and fix the three layers.Since it utilizes elastic force, it can be held and fixed. The fixation is reliable, the work is easy, it can withstand repeated use such as removal and re-identification, and it can be manufactured at low cost. A row of protrusions are provided, a hollow part is provided opposite to the protrusions, and the metal eaves provided on the outside of the front plate of the device main body and extending further forward from the front surface thereof are provided with the above-mentioned By bringing the protrusions into contact with each other, it is possible to completely prevent water vapor and heat from leaking from the heating chamber, and the protrusions interposed between the metal body of the door and the front transparent plate can be used as a retaining ring. By uniformly disposing them on the inside, chipping and cracking around the transparent plate can be prevented.

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

In FIG. 1, facing the front opening 2 of the heating chamber 1, a gold plate having a large number of small holes 3 and a gold plate frame 5 surrounding the plate containing a high frequency damping device 4 are integrally formed. is,
This forms the main body of the door. The high-frequency attenuation bag W4 generally has an opening on the back of the door for introducing high-frequency waves, and is further processed with slits to restrict the direction of propagation of high-frequency waves. Since it is not preferable for cleaning etc., a resin cover 6 is provided to cover this. The resin cover 6 is attached so as to be flush with the gold plate having the small holes 3, so that the back surface of the door is substantially flush with the front plate 7 of the heating chamber 1.

A transparent plate 8 is attached to the front surface of the metal frame 5, and the inside of the heating chamber 1 can be seen through the transparent plate 8 and the small holes 3 in the metal plate.

As described above, the transparent plate 8, the metal frame 5,
It has a three-layer structure with a back cover 6 made of resin, and a holder 9 is provided to hold each of these on the outer peripheral surface so as not to create a gap.

The holder 9 has a band shape spanning the three layers, and is made of a heat-resistant and elastic material that can withstand the heat generated during heating, such as heat-resistant rubber, and is made of a material such as heat-resistant rubber, as shown by the broken line in the figure. The front part is slightly smaller than the outer periphery of the three layers, and in order to attach it, use elasticity to stretch it as shown by the arrow and fit it. The elastic force of the material presses each component of the three layers inward, making it possible to hold them.

The holder 9 is made of an extrusion molded product of rubber or the like, which is cut to an appropriate length and joined at the ends to form a ring shape, and has a uniform cross section over the entire circumference.

FIG. 2 shows another embodiment, in which the retaining band 10 has a plurality of protrusions 11 on its outer periphery, and a hollow portion 12 facing the protrusions 11. Since the holder 10 is an extrusion molded product, the protrusion 11 and the hollow part 12 are uniformly formed all around.

On the other hand, on the outside of the front plate 7 on the front surface of the heating chamber, an eaves portion 13 such as an external material extending further forward from the surface of the front plate 7 is provided. This is a method that is often used to prevent foreign objects from being caught between the door and the front plate 7, and also to prevent high frequency leakage. The protrusion 11 is configured to abut against the inner wall surface of the eaves section 13. Hollow part 1
2 is for absorbing the deflection when the tip of the protrusion 11 comes into contact with the inner wall of the eaves part 13, and in the case of porous extrusion molding or the material itself being softer, a hollow part 12 is formed. Sometimes it's not necessary.

FIG. 3 shows still another embodiment, in which the holder 14 has a uniform protrusion 15 on its inner circumference, which is formed by a metal frame 5.
and the front transparent plate 8.

As described above, according to this embodiment, the transparent plate 8, the metal main body,
Since the belt-shaped holder 9 made of an extruded product such as elastic rubber is used to hold the three layers of the back cover 6, the holding and fixing is reliable, and the installation work is easy.
It is easy to use and can withstand repeated use such as removal and re-fixing.

Further, a protrusion 11 and a hollow part 12 facing the protrusion 11 are provided on the outer periphery of the holding body 10, and this is brought into contact with the inner wall of the eaves part 13 that is outside the front plate 7 and extends forward. This prevents water vapor, heat, etc. from escaping from the gap between the front plate 7 and the back of the door when the door is closed, and allows the protrusion 11 to easily bend due to the hollow part 12, allowing the door to adhere tightly to the front plate 7. It also helps reduce impact noise when closing, without sacrificing performance.

Further, by interposing a part 15 of the holder between the metal frame part 5 of the door and the front transparent plate 7, when a glass material is used for the transparent plate 8, the end part thereof touches the metal part. This has the effect of preventing chipping, cracking, and damage caused by impact force caused by rough opening and closing.

Effects of the Invention As described above, according to the present invention, the following effects can be obtained.

(11 The belt-shaped holder with elastic force holds and fixes the three layers of the transparent front plate, the metal door body, and the outer periphery of the resin cover that covers the back opening of the high-frequency damping device.
Reliable holding and fixing is achieved without the need for extra parts for mounting and fixing.

(2) Forming an extruded product such as heat-resistant rubber into a ring shape,
The inner periphery of the ring is made slightly smaller than the outer periphery of each part of the three-layer structure, and this is stretched and fitted to hold the ring, making the work simple and easy, and ensuring uniform tightening force around the entire periphery of the holder. There are no defects such as the formation of gaps in parts due to the action of the parts, the parts can be manufactured at low cost, they can be reliably removed and re-fixed for repair or replacement, and they can withstand repeated use.

(3) A protrusion and a hollow part opposing the protrusion are uniformly provided on the outer periphery of the holder, and the protrusion is brought into contact with the inner wall of the eave extending forward to the outside of the front plate, so that the protrusion from the heating chamber is It can prevent leakage of water vapor and heat.

(4) By providing protrusions uniformly around the holder and interposing the protrusions between the front transparent plate and the gold-plated door body,
It can prevent cracks and chips that tend to occur at the edges of transparent plates.

3 is a partial sectional view of a door of another embodiment, and FIG. 3 is a partial sectional view of a door of still another embodiment.

3...Small hole, 4...High frequency attenuation device,
5...Full bending frame part, 6...Back resin cover, 7...Front plate, 8...Front transparent plate, 9... ... Holding body, 10 ... Holding body in the second embodiment, 11 ... Outer peripheral protrusion, 14
...Holding body in the third embodiment, 15...
...Inner peripheral protrusion.

Name of agent: Patent attorney Toshio Nakao (1 person) Figure 1

Claims (4)

[Claims] (1) A metal door body with a built-in high-frequency attenuation device in the peripheral frame and a large number of pores in the center, a resin cover that covers the back side of the high-frequency attenuation device, and a front side of the metal door body. A door device for a high-frequency heating device, which has a three-layer structure of covering transparent plates, and the outer periphery of the three layers is covered by an elastic band-shaped holder. (2) The door of the high-frequency heating device according to claim 1, wherein the elastic band-shaped holder is formed into a ring shape using heat-resistant rubber, and the inner circumference of the ring is slightly smaller than the outer circumference of the metal frame of the door. equipment equipment. (3) A plurality of rows of protrusions on the outer periphery of the ring and a hollow part facing the protrusions are uniformly provided over the entire length of the holder, and the protrusions are arranged on the front plate of the device body when the door is closed. 3. A door device for a high-frequency heating device according to claim 1, wherein the door device is configured to abut against an inner wall portion of a metal eave that is located on the outside and extends further forward than the front surface of the front plate. (4) A door device for a high-frequency heating device according to claim 1 or 2, wherein the protrusions interposed between the transparent plate and the metal door body are uniformly provided on the inner peripheral surface of the ring.