KR100395928B1 - Inner case of micro wave oven - Google Patents

Abstract

The present invention relates to an inner case of a microwave oven, and an object thereof is to improve a joining structure between a body and a front plate on an enclosure forming a cooking chamber, thereby improving assembly workability and further reducing manufacturing costs.

According to the inner case of the microwave oven according to the present invention, the coupling part 24 and the coupling part 24 are formed to be bent along the opening 21a of the front plate 21 and the coupling protrusion 24a is formed at regular intervals. Is bent at the end of the body 23 to be inserted and press-bonded to form a joining space 26, and the press-fit bending part 25 having a plurality of slots 25c formed therein so as to engage and engage the joining protrusion 24a during press joining. In addition, the front plate 21 and the body 23 is press-bonded to form an inner case 20. Accordingly, the manufacturing of the inner case 20 is made easier, and thus the manufacturing cost is also reduced. In addition, the coupling protrusion 24a is caught in the slot 25c during press bonding of the front plate 21 and the body 23 to improve their tensile strength, so that the inner case 20 may be more robustly assembled. .

Description

Inner case of micro wave oven

The present invention relates to an inner case of a microwave oven, and more particularly, to an inner case of a microwave oven formed by bonding a body on a front plate and an enclosure having an opening of a cooking chamber.

In general, a microwave oven is a cooking apparatus that cooks food by frictional heat between molecules by repeatedly converting a high frequency of 2450 MHz in a magnetron into a cooking chamber to repeatedly convert a molecular array of moisture contained in the food.

As shown in FIG. 1, a conventional microwave oven having such a function is coupled to enclose an inner case 2 and an inner case 2 in which a cooking chamber 3 is formed therein, and a magnetron (not shown) and a high voltage transformer ( And an outer case 1 that forms an electrical equipment room (not shown) such that the electrical equipment is installed, and a door 4 that opens and closes the cooking chamber 3.

The outer case 1 is bent in a "??" shape to form an upper plate portion and both side plate portions, and the front and rear ends thereof are extended to the front plate 2a and the rear plate 2b of the inner case 2 to be described later. They are combined to form the appearance of a microwave oven.

And the inner case 2 is composed of a front plate (2a), a back plate (2b), the body (2c) on the housing. The front plate 2a and the rear plate 2b extend to the upper side and the left and right sides by a predetermined width and are coupled to the front and rear ends of the outer case 1. In addition, the opening of the cooking chamber 3 is formed in the front plate 2a, to which the door 4 is hinged.

This inner case 2 is joined to the front plate (2a) and the rear plate (2b) before and after the body (2c) on the housing by welding means to form a cooking chamber (3). To this end, the front end portion of the body 2c is provided with a first coupling portion 2d bent in surface contact with the rear surface of the front plate 2a, and the rear end portion thereof is bent in surface contact with the rear surface of the rear plate 2b. Two coupling portions 2e are formed.

Therefore, in the state where the first coupling part 2d of the body 2c is brought into surface contact with the rear surface of the front plate 2a, it is joined by spot welding means for applying current and pressure thereto, and also the rear plate 2b. The inner case 2 having the cooking chamber 3 formed therein is manufactured by making a surface contact between the back surface and the second coupling part 2e and then joining the same through spot welding means.

However, since the inner case 2 of the conventional microwave oven is formed by joining the front plate 2a, the back plate 2b, and the body 2c through welding means, the manufacturing process thereof is complicated and the manufacturing cost is also increased. There is a disadvantage.

In addition, when a gap is generated due to inadequate welding during the manufacturing of the inner case 2, high frequency may be leaked through this, so that considerable care is required and assembly workability is reduced.

The present invention is to solve such a problem, an object of the present invention is to improve the assembly workability of the body and the front plate of the body on the cooking chamber formed at the same time to improve the assembly workability of the inside of the microwave oven To provide a case.

Figure 1 is a side cross-sectional view showing the internal configuration of a conventional microwave oven.

2 is an exploded perspective view showing a microwave oven according to the present invention.

Figure 3 is an exploded perspective view showing an extract of the coupling structure of the front plate and the body of the inner case according to the present invention.

Figure 4 is a cross-sectional view taken along the line IV-IV of Figure 3, it is shown by extracting the coupling portion and the compression bending portion according to the present invention.

5 and 6 show the assembly process and the assembled state of the front plate and the body according to the present invention.

* Description of symbols on the main parts of the drawings *

20. Inner case 21. Front panel

23. Body 24. Coupling

24a.Combination projection 25.Compression bending part

25a..1st bending part 25b..2nd bending part

25c..Slot

The present invention for achieving this object,

In the inner case of the microwave oven having a body on the housing forming a cooking chamber therein, a front plate bonded to the front of the body and the opening of the cooking chamber, and a joining means for joining the front plate and the body,

Joining means is bent to the rear side along the opening of the front plate and the coupling portion formed with a plurality of coupling projections at regular intervals, and formed by bending at the end of the body so that the coupling portion is inserted and press-bonded to form a coupling space during press bonding Is a configuration characterized in that it comprises a crimp bending portion formed with a plurality of slots to be coupled.

In addition, the engaging projection is characterized in that made through the forming process along the edge of the engaging portion.

In addition, the compression bending portion has a primary bending portion bent outward at the end of the body, and the secondary bending portion bent again to form a coupling space in the primary bending portion,

Slots are characterized in that provided at regular intervals in the bent portion of the primary bending portion and the secondary bending portion.

According to this structure, the front plate and the body are press-bonded to form an inner case, thereby making it easier and more robust to assemble it.

Hereinafter, one preferred embodiment according to the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIG. 2, the microwave oven according to the present invention is detachably coupled to the inner case 20 and the inner case 20 in which the cooking chamber 30 is formed so that one surface is opened therein, and the cooking chamber 30 is connected to the microwave oven. It is provided with the outer case 10 which forms the electrical equipment compartment 40 partitioned.

The outer case 10 is composed of a left right plate portion 11L (11R) and an upper plate portion 12 covering the upper side of the inner case 20, both ends of which are bent in the lower direction to surround both sides of the inner case 20. The rear end and the rear end are respectively coupled to the front plate 21 and the rear plate 22 of the inner case 20 to form an appearance of a microwave oven. In addition, the electrical equipment room 40 has a magnetron 41 for radiating high frequency to the cooking chamber 30, a high voltage transformer 42 for applying a high voltage to the magnetron 41, a cooling fan 43 for cooling the electrical equipment, and the like. Is installed, these electrical appliances are protected from the outside as the outer case 10 is coupled.

The inner case 20 includes a front plate 21 having an open portion 21a of the cooking chamber 30, a back plate 22 closing the rear of the cooking chamber 30, a front plate 21 and a rear plate. (22) is coupled to the front and rear ends and includes a body 23 on the enclosure in which the cooking chamber 30 is formed. The front plate 21 and the rear plate 22 extend by a predetermined width so as to partition the front and rear of the electrical equipment compartment 40 from the outside. The front surface of the front plate 21 is hinged and coupled to the door 50 for opening and closing the cooking chamber 30, and a control panel 44 having a plurality of operation buttons for operating the microwave.

3 and 4, such an inner case 20 is fitted through a compression bending portion 25 provided on the coupling portion 24 provided on the front plate 21 and the body 23 on the housing, and then press-bonded. It is made through, the junction structure thereof will be described in detail as follows.

First, the front plate 21 is provided with a coupling portion 24 bent a predetermined angle toward the back side along the edge of the opening portion 21a. The bending angle θ of the coupling part 24 is preferably configured such that the vertical height H1 of the coupling part 24 is low so that the coupling angle 24 is easily obliquely assembled to the compression bending part 25. In the present exemplary embodiment, the coupling part 24 is bent by about 120 ° to configure the angle between the actual front plate 21 and the coupling part 24.

In addition, a plurality of half moon-shaped coupling protrusions 24a are formed in the coupling portion 24. The coupling protrusion 24 is formed through a forming process at regular intervals along the edge of the coupling portion 24, its protrusion height (H2) is preferably configured to be the same as the thickness of the body (23).

The body 23 has a lower plate 23a having both ends bent in an upward direction so that the upper part is opened, and a cooking chamber 30 covering the opening of the lower plate 23a to form the cooking chamber 30, and both ends joined by welding means. It is provided with an enclosure.

A compression bending portion 25 is provided at the tip of the body 23 on the housing so that the coupling portion 24 is fitted and then joined by pressing. The crimp bending portion 25 is a flange-shaped primary bending portion 25a bent outward 90 ° along the tip of the body 23 and the front plate 21 at the distal end of the primary bending portion 25a. It is provided with the secondary bending part 25b which is bent back toward the back surface and the coupling part 24 is inserted. At this time, the secondary bending portion 25b is bent at an obtuse angle in the primary bending portion 25a, thereby forming a coupling space 26 between the primary bending portions 25a to insert the coupling portion 24. .

In addition, a plurality of slots 25c are provided at the bent portion between the primary bending portion 25a and the secondary bending portion 25b. The slots 25c are provided along the bent portions at the same intervals as the engaging projections 24a. Thus, the slots 25c are inserted into the engaging spaces 26 of the crimp bending part 25, and then pressed by the press apparatus. The coupling protrusion 24a is fitted into the slot 25c, which will be described in detail in an assembly process to be described later. The slot 25c is formed in a long hole type, so that the protrusion 24b is caught while the coupling protrusion 24a is completely received.

Next, the assembly process and effects of the inner case 20 of the microwave oven according to the present invention will be described.

First, as shown in FIG. 5, the front plate 21 and the body (ie, the coupling part 24 having the coupling protrusion 24a at regular intervals) are inserted into the coupling space 26 formed in the compression bending part 25. 23) Preassemble. At this time, since the coupling portion 24 is bent at an obtuse angle so that the vertical height H1 is low, the coupling portion 24 is inserted into the coupling space 26 formed between the primary bending portion 25a and the secondary bending portion 25b without difficulty. Since the coupling protrusions 24a and the slots 25c are formed at equal intervals, the coupling protrusions 24a and the slots 25c are positioned at corresponding intervals.

In this way, as shown in FIG. 6 in a state where the coupling part 24 and the compression bending part 25 are assembled to engage, the outer side of the front plate 21 and the compression bending part (not shown) through a press device (not shown). When mechanical pressure is simultaneously applied in the directions of arrows P1 and P2 at the outside of the primary bending portion 25a of 25), the secondary portion is formed between the primary bending portion 25a and the front plate 21 of the crimp bending portion 25. The bending part 25b and the coupling part 24 are completely fitted while being compressed. That is, the front plate 21 and the body 23 are press-bonded through the coupling part 24 and the compression bending part 25.

At this time, the engaging projection 24a is completely accommodated in the slot 25c and at the same time the protruding portion 24b cannot be caught. In addition, the engaging projection 24a is projected to the outside of the primary bending portion 25a in the state of being caught in the slot 25c because the protrusion height H2 is the same as the plate thickness of the body 23 as described above. Part does not exist.

As a result, the front plate 21 and the body 23 are press-bonded to form the inner case 20 so that the assembly thereof can be easily performed, and at the same time, the engaging protrusion 24a is caught in the slot 25c, thereby increasing the tensile strength. The inner case is reliably manufactured.

As described above in detail, according to the inner case of the microwave oven according to the present invention, the coupling portion formed bent along the opening of the front plate and the coupling protrusions formed at regular intervals, the coupling portion is inserted into the press bend to be bent at the end of the body It is formed to form a coupling space and has a compression bending portion formed with a plurality of slots to be coupled to the coupling projection when the press bonding, the front plate and the body is press-bonded to form an inner case. Accordingly, the manufacturing of the inner case is made easier, and thus the manufacturing cost is also reduced. In addition, by engaging the engaging protrusion in the slot when the front plate and the body press bonding, their tensile strength is improved, there is an advantage that the inner case is more securely assembled.

Claims (3)

In the inner case of the microwave oven having a body on the housing forming a cooking chamber therein, a front plate bonded to the front of the body and the opening of the cooking chamber, and the joining means for joining the front plate and the body, The joining means, The body 23 is formed to be bent to the rear side along the opening of the front plate 21 and the coupling portion 24 formed with a plurality of coupling protrusions 24a at regular intervals, and the coupling portion 24 is inserted and press-bonded. And a bending bending part 25 having a plurality of slots 25c formed therein so as to be bent at an end to form a coupling space 26 and the coupling protrusion 24a is inserted and coupled at the time of press bonding. Inner case. The method of claim 1, The coupling protrusion (24a) is the inner case of the microwave oven, characterized in that made through the forming process along the edge of the coupling portion (24). The method of claim 1, The compression bending portion 25 is bent again to form the primary bending portion 25a bent outwardly from the end of the body 23 and the coupling space 26 in the primary bending portion 25a. Secondary bending portion 25b is provided, The slot (25c) is the inner case of the microwave oven, characterized in that provided at regular intervals in the bent portion of the primary bending portion (25a) and the secondary bending portion (25b).