JPH0737276Y2 - Heater panel for microwave oven, etc. - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION "Industrial application field" The present invention relates to improvement of a heater panel for a microwave oven or the like having a heating function by an electric heater.

"Prior art" Conventionally, there are microwave ovens that have a heating function by an electric heater in addition to a high-frequency heating function, and as a heater panel for that, heating wires are used on a wide flat plate heat-resistant insulating plate. The one that is wound so that it is lined up only on one side is used.

Such a conventional heater panel is, as shown in FIG.
A large number of concave cuts 2 are formed at intervals on the left and right opposite edges of the heat resistant insulating plate, and heating wires 3 are sequentially hooked to the cuts 2 so that the heating wires are arranged only on one surface. is there.

[Problems to be solved by the invention] By the way, in this type of conventional heater panel, as is apparent from FIG.
Are all provided in a concave shape that is substantially parallel to the heating wire stretched in a plan view, the cut 2 has a substantially linear shape and is opened toward the outside. If the tension is insufficient, or if the heating wire 3 is loosened due to expansion due to heating, etc., the hooked and folded portion of the heating wire 3 is along the notch 2 and the heat-resistant insulating plate. No. 1 between the heating wires 3 and 3 at the folded-back portion protruding outside the heat-resistant insulating plate 1
As shown in the figure, the heat-resistant insulating plate 1 is not present, so that a gap 4 is formed between the heating wires 3 and 3 at the hook-and-fold portion, and as a result, the heating wire protruding outside the heat-resistant insulating plate 1 is formed. There was a problem that a spark phenomenon occurred between No. 3 and No. 3 and this part was brought into an abnormally high temperature state and melted to cause a disconnection failure.

The present invention is intended to solve the above problems of the conventional technique, and even if some looseness occurs in the process of winding the heating wire around the band-shaped heat-resistant insulating plate, or Even if the heating wire expands due to expansion during heating, etc., the heating wire of the portion that is hooked on the heat resistant insulating plate and hooked so as to be folded back is located outside the heat resistant insulating plate.
A microwave oven that reliably prevents sparks from sticking out and making contact with each other, or between heating wires in the protruding parts, and can be locked and locked so as not to cause disconnection failure for a long period of time. It is intended to provide a heater panel such as.

[Means for Solving the Problems] In order to achieve the above object, a heater panel for a microwave oven or the like according to the present invention is provided with a large number of V-shaped cut grooves at regular intervals on both left and right edges in the longitudinal direction. By providing, many winding pieces and pressing pieces are alternately formed. Then, a band-shaped heat-resistant insulating plate is formed in which a space is provided between the ends of the winding piece and the pressing piece. The heating wire is hooked on the back side of the winding piece from the cut groove, exposed again on the front side, and then hooked on the back side of the winding piece from the cut groove provided on the opposite side. Hang on. Then, both ends of the heating wire are penetrated and locked into locking through holes opened on both sides of the band-shaped heat-resistant insulating plate, and only one surface of the band-shaped heat-resistant insulator is an heating surface by the heating wire.

[Operation] According to the present invention, a large number of winding pieces and pressing pieces are provided by providing the left and right edges of the strip-shaped heat-resistant insulating plate formed in the longitudinal direction with the V-shaped cut grooves. What has a space provided between the tips is formed. Then, the heating wire is inserted into the winding piece from the gap portion of the band-shaped heat-resistant insulating plate and into the notched groove obliquely provided at the base of the pressing piece, folded back while being locked on the back side of the winding piece, and The belt-shaped heat-resistant insulating plate is hooked on a winding piece through a notched groove on the opposite side of the surface of the belt-shaped heat-insulating plate, and is securely locked by the pressing piece so as not to protrude outside.

[Embodiment] An embodiment of a heater panel for a microwave oven or the like according to the present invention will be described with reference to the drawings.

In FIG. 1 and FIG. 2, 101 is a band-shaped heat-resistant insulating plate, and a large number of V-shaped cut grooves 105 are formed at a constant interval on both left and right edges in the longitudinal direction. The winding piece 102 and the pressing piece 103 are alternately formed.
Then, a gap portion 104 is formed between the tips of the winding piece 102 and the pressing piece 103. 107 is a strip-shaped heating wire, which is hooked from the cut groove 105 to the back surface of the winding piece 102 and exposed again on the front surface, and this time from the cut groove 105 on the opposite side of the strip heat resistant insulating plate 101. The belt-shaped heat resistant insulation plate 101
The heating wire 107 should be exposed only on one side of the
Both ends of 07 are locked through through holes 106 for locking that are opened on both sides of the band-shaped heat-resistant insulating plate 101.

Therefore, the cut grooves 105, 105 obliquely provided on both sides of the base of the locking piece 103 ... Are formed in an inverted C shape when seen in a plan view, and are engaged in the cut grooves 105, 105. The stopped heating wire 107 is securely locked while being attached to the inclined edges of the inclined cut grooves 105, 105 without protruding to the outside.

Therefore, in the step of winding the heating wire 107 around the band-shaped heat-resistant insulating plate 101, even if the heating wire 107 is loosened to some extent, or even if the heating wire 107 expands and extends due to heating, the heating wire 107 is fitted and locked in the cut grooves 105, 105. The protruding part protrudes outside and touches each other, or the heating wire 107 in the protruding part becomes abnormally hot due to a spark phenomenon due to the gap between the heating wires 107 and 107 in the protruding part, causing a disconnection accident. It is possible to prevent the occurrence of.

"Effect of device" Since the device of the present invention is configured as described above, the following effects are obtained.

At the left and right side edges of the strip-shaped heat-resistant insulating plate 101 in the longitudinal direction, the gap 1
Placing 04, the winding piece 102 and the pressing piece 1 which are provided alternately in large numbers
03, in the work process of winding the heating wire 107 in a continuous manner while hooking the heating wire 107, the winding piece 102 and the pressing piece 1
Since a gap 104 is provided between the ends of 03, when the heating wire 107 is inserted into the cut groove 105, the winding piece 10
2, or because the tip of the pressing piece 103 can be easily inserted without being caught, the work can be performed quickly and easily. Further, since the winding piece 102 of the heating wire 107 is formed in the shape of a mountain, it does not become a string, but is bent and securely hooked in a band shape, and an abnormal current flows in the bent part. There is no. Further, even if the folded-back portion is loosened to some extent, or the heating wire 107 expands and expands due to heating, the folded-back portion of the heating wire 107 is reliably received by the inclined edge of the notched groove 105 directed inward. Since it is pressed by the pressing piece 103, the cut groove 105
It is possible to reliably prevent the delusion from protruding outward.

Therefore, as seen in the conventional heater panel shown in FIGS. 4 and 5, the heating wire is in the longitudinal direction of the strip-shaped heat-resistant insulating plate,
At the folded-back portion that protrudes to the outside, the heating wires overlap each other and come into contact with each other, or the protruding portions that cause contact create a spark phenomenon due to the formation of a gap, and the heating wire at the protruding portion becomes abnormally hot. Therefore, it is possible to eliminate the risk of a wire breakage accident by melting or melting. Therefore, the present invention has effects such as obtaining a heater panel that can be used for a long period of time.

[Brief description of drawings]

The drawings show an embodiment of a heater panel for a microwave oven or the like according to the present invention. FIG. 1 is an overall plan view, FIG. 2 is a plan view of a band-shaped heat-resistant insulating plate, and FIG. FIG. 4 is a partially enlarged plan sectional view of a part of the conventional example, and FIG. 5 is a vertical cross-sectional side view taken along the line AA in FIG. 4, showing a spark generation state. 101 ... Band heat-resistant insulating plate, 102 ... Winding piece, 103 ... Pressing piece, 104 ... Spacing part, 105 ... Notch groove, 106 ... Locking through hole, 107 ... Heating wire

Claims (1)

[Scope of utility model registration request] 1. A winding piece 102 and a pressing piece 10 which are provided with V-shaped cut grooves 105 at regular intervals on both left and right edges in the longitudinal direction.
A large number of 3 and 3 are alternately formed, and a band-shaped heat-resistant insulating plate 101 is formed with a gap portion 104 formed between the tips thereof, and the heating wire 107 is hooked from the cut groove 105 to the back surface of the winding piece 102, and again. It is exposed on the surface, and this time it is hooked on the back surface of the winding piece 102 on the opposite side repeatedly and continuously, and both ends of the heating wire 107 are locking penetrations opened on both sides of the band-shaped heat-resistant insulating plate 101. A heater panel for a microwave oven or the like characterized in that it is penetrated and locked in a hole (106), and only one surface of the band-shaped heat-resistant insulating plate (101) is a heating surface by a heating wire (107).