JP2794907B2 - Electric stove heating element - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heating element of an electric stove used for a cooking device, and more particularly to an electric stove having a structure for restricting thermal deformation.

2. Description of the Related Art A sheathed heater used as a heating element of an electric stove operates at a high temperature, and may be thermally deformed when used for a long period of time. Therefore, much effort has been put into the design, taking into account reliability and safety aspects.

Conventionally, for example, a configuration as described in JP-A-59-103291 has been adopted. Further details are given in Chapter 7.
Referring to the drawing, a spiral sheathed heater 1 is provided on a top plate 2 of an electric stove body. Both ends 3 of the sheathed heater 1 are bent substantially in a Z-shape, have two holes (not shown) through which both ends 4 are passed, and a key-shaped heater fitting 5 is mounted. . The base of the heat sink 6 is the sheathed heater 1
Has a fin portion wound around both end portions 4. Support pottery 7
Are electrically insulated electrical parts 9 connected to both ends 4 of the sheathed heater 1 and terminals 8 protruding from the both ends 4. The supporting pottery 7 is locked by screws 10 provided on the heater fitting 5. Both ends 4 of the sheathed heater 1 are spring members
At 11 it is supported on the top plate 2 of the main body.

SUMMARY OF THE INVENTION However, in the above configuration, both ends 4 of the heater are wound around the heat radiating plate 6, and both ends 4 having the sealing material and the electrical component 9 are provided.
The temperature of the sheath heater can be reduced, so that the sealing deterioration and the insulation deterioration can be reduced. On the other hand, in order to secure the flatness of the upper surface to the sheath heater, one end of the sheath heater end 4 is connected to the heater fitting 5. And the other end had to be loosely fitted and attached. Therefore, the object to be heated placed on the sheathed heater 1 does not necessarily have a flat bottom surface, and the sheathed heater 1 undergoes abnormal thermal deformation due to thermal expansion and contraction, so that the radiator plate 6 moves in the direction of the arrow. There has been a problem that the contact with the terminal 8 which is a power supply unit results in insulation deterioration.

An object of the present invention is to solve the above-mentioned conventional problems, and an object of the present invention is to provide a heating element of an electric stove which does not cause electrical insulation deterioration even if the spiral sheathed heater 1 is abnormally thermally deformed. I have.

Means for Solving the Problems In order to achieve the above object, a first means of the heating element of the electric stove according to the present invention is provided with a sealing insulator for sealing both ends of a heating element of a spiral wound sheathed heater. A through hole through which a terminal derived from both ends of the heating element passes through the insulator;
A small diameter part and a large diameter part are provided, and the large diameter part is larger than the pipe diameter of the heating element.

The second means includes a fixing portion for fixing one end of both ends of the heating element so as to abut inside a vertical surface of the heating element bent in an L shape from an outermost ring portion of the heating element, and a second end. The tongue piece is extended from a heater fitting which is attached so as to be loosely fitted.

The third means is such that a convex portion lower than the upper surface of the heating element is provided on a support base extending radially between the annular portions of the heating element.

Operation With this configuration, the first heating element of the electric stove according to the present invention is provided.
The large-diameter part of the heating element provided on the sealing insulator, which is larger than the pipe diameter, prevents the heat sinks wrapped around both ends of the heating element from moving to the power supply section due to abnormal thermal deformation of the heating element. It acts to serve as a stopper.

The tongue extending from a heater fitting to which one end of both ends of the heating element is provided so as to contact the inside of a vertical portion bent in an L-shape from the outermost ring of the heating element of the second means. Due to abnormal thermal deformation, the vertical portion bent in an L shape acts as a stopper for preventing the vertical portion from moving in the opposite direction to the power supply portion.

Furthermore, the convex part lower than the upper surface of the heating element, provided with a support base extending radially between the rings of the heating element of the third means,
An appropriate allowance for the normal thermal expansion of the heating element is provided between the side of the projection and the side of the heating element, so as to play a role in regulating abnormal thermal deformation of the annular heating element. Works.

Example Hereinafter, an example of a heating element of an electric stove according to the present invention will be described with reference to the drawings.

1 to 5 show the first and second embodiments, in which 21 is a stove body, and a spiral heating element 22 has a flat upper surface on which an object to be heated (not shown) is placed. , Hanging both ends,
It has a lead portion 23 bent in an L-shape in the same direction. The support stand 24 supports the heating element 22 from below, extends radially from the center of the heating element 22 almost uniformly in three directions, protrudes from the outer ring of the heating element 22, and extends in the direction opposite to the lead 23. The protruding support 24 has a hook 25 at its distal end, a claw 26 for holding an extra-ring portion and an innermost ring of the heating element 25, and a supporting surface 27 for supporting other ring-shaped portions. Also other two-way support
24 has a similar support surface 27 so that the upper surface of the heating element 22 is flush. The saucer 28 is located below the heating element 22 and includes a flange 29 on which the tip of the support 24 is placed.
Further, a notch 30 for inserting the lead portion 23 of the heating element 22 is provided. The back plate 32 covers the lower surface of the body 31, and the legs 33 support the stove body 21.

At both ends 34 of the lead portion 23 of the heating element 22, a fixing portion 35 for fixing one end of the heating element 22 extending from the innermost ring portion and a heating element 22.
And a heater fitting 37 attached so that the other end extending from the outermost ring portion is loosely fitted. The supporting pottery 38 covers electrical parts such as terminals 39 extending from both ends 34 of the heating element 22. The heat sink 40 holds both ends 34 of the heating element 22 between the supporting pottery 38 and the heater fitting 37,
It has a fin for cooling both ends 34. A spring member 41 attached to the body 31 locks a heater fitting 37 and rotatably supports the heating element 22 to the body 31. The spring member 41 urges the heating element 22 to the side opposite to the lead section 23, and the hook section 25 provided at the tip of the support base 24 constituting the heating element 22 by the force.
Are locked and attached to locking holes (not shown) provided in the tray 28 and the body 31. A sealing insulator 42 for sealing both ends of the heating element 21 has a through hole 34 penetrating a terminal 39 derived from both ends of the heating element 22, a small diameter section 44 and a large diameter section 45, and the small diameter section 44 is a pipe of the heating element 22. The large diameter portion 45 is inserted inside the end face and is larger than the pipe diameter.

In the above configuration, both ends of the heating element 22 in FIG.
Since the large-diameter portion 45 larger than the pipe diameter of the heating element 22 is provided on the sealing insulator 42 for sealing the 34, the heat sink 40 wound around both ends 34 of the heating element 22 is abnormal due to the thermal expansion and contraction of the heating element 22. Over time, the lead 23 of the outermost ring of the heating element 22 to which the heater fitting 37 is loosely fitted is deformed back and forth, and at the same time, the heating plate 40 is connected to the power supply section (in the direction of the arrow). The large-diameter portion 45 of the sealing insulator 42 plays the role of a stopper, so that it does not come into contact with the terminal 39 serving as a power supply portion, and electrical insulation can be secured.

1 and 2 show a second embodiment, in which a heating element is shown.
From the heater fitting 37 fixed to one end of the both ends 34 of the 22, the tongue is brought into contact with the inside of the vertical portion 46 bent in an L-shape from the outermost ring portion of the heating element 22 at the other end where the heating element 22 is loosely fitted. A piece 47 is extended.

In the above configuration, as described above in the first embodiment, even when the lead portion 23 of the heating element 22 loosely fitted to the heater fitting 37 is thermally deformed inward on the side opposite to the power supply portion, The tongue 47 extending from the heater fitting 37 mechanically heats the heating element 22.
The movement of the lead portion 23 of the
Movement of the heat sink 40 can be reduced, and there is no contact if a certain insulation distance between the heat sink 40 and the terminal 39 is secured in advance.

FIG. 3 shows a third embodiment, in which a stainless steel support 24 extending radially between the annular portions of the heating element 22 has a projection 48 lower than the upper surface of the heating element 22 on which the object to be heated is placed. And an appropriate allowance P for normal thermal expansion is provided between the side portion 48 'of the convex portion 48 and the side portion 22' of the heating element 22.

With this configuration, the convex portion 48 can regulate and prevent abnormal deformation of the annular heating element 22 during heating and cooling. Therefore, similarly to the first and second embodiments, the heat sink 40 and the terminal 39 are connected to each other. Since electric insulation can be achieved and the space between the spiral annular portions is kept relatively uniform, a safe and reliable heating element of the electric stove can be obtained.

Effects of the Invention As is clear from the description of the above embodiment, in the heating element of the electric stove of the present invention, the sealing insulator for sealing both ends of the heating element is provided with a large diameter portion larger than the pipe diameter of the heating element.
The base of the heat sink wrapped around both ends of the heating element causes abnormal thermal deformation due to thermal expansion and contraction of the heating element, and even if the base of the heat sink moves to the power supply side, the large diameter portion of the sealing insulator is the stopper. It plays a role, and electrical insulation can be ensured without contacting the terminal that is the power supply unit.

Also, from the heater fitting fixed to one end of both ends of the heating element, the tongue piece is brought into contact with the inside of the vertical portion bent in an L-shape from the outermost ring portion of the heating element at the other end where the heating element is loosely fitted. Because of the extension, abnormal heat deformation of the heating element in which the vertical portion moves to the opposite side to the power supply portion can be prevented.

Furthermore, since a convex portion is provided on the support base between the annular portions of the heating element, and thermal deformation between the spirally-shaped annular portions is regulated, it is possible to keep the uniform between the spirally-shaped annular portions.

As described above, electrical insulation between the radiator plate and the terminals can be achieved, and a safe and reliable heating element of the electric stove can be provided.

[Brief description of the drawings]

FIG. 1 is a plan view showing a main part of a heating element of an electric stove showing an embodiment of the present invention, FIG. 2 is a partially cutaway front view of the main part, and FIG. 3 shows an entire structure of the electric stove. FIG. 4 is a side view of the heating element of the electric stove, FIG. 5 is a plan view of the heating element of the electric cooking stove, and FIG. 6 is a main part of the heating element of the electric cooking stove of another embodiment. FIG. 7 is a partially cutaway front view of a main part of a heating element of a conventional electric stove. 22 ... heating element, 24 ... support base, 34 ... both ends, 35 ... fixed part, 37 ... heater metal fittings, 38 ... support porcelain, 39 ... terminal, 40 ... heat sink, 42 ... Seal insulator, 43 ... Through hole, 44
... small diameter part, 45 ... large diameter part, 46 ... vertical part, 47 ... tongue piece, 48 ... convex part.

Continuation of the front page (56) References JP-A-4-19988 (JP, A) JP-A-1-163987 (JP, A) JP-A-59-103291 (JP, A) JP-A-1-160689 (JP, A) , U) Actually open 57-2687 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) H05B 3/76 H05B 3/04 F24C 7/06

Claims (3)

(57) [Claims] 1. A heating element having both ends of a spiral wound sheath heater suspended therefrom and bent in an L-shape in the same direction, a support for supporting the heating element, and one end of both ends of the heating element fixed. A heater fitting attached so that the fixing portion and the other end are loosely fitted, a supporting pottery covering both ends of the heating element, and holding both ends of the heating element between the supporting pottery and the heater fitting;
A radiating plate having a fin portion and a sealing insulator for sealing both ends of the heating element are provided. And a heating element of the electric stove having a large diameter portion larger than a pipe diameter of the heating element. 2. A heating element for an electric stove according to claim 1, wherein a tongue piece is extended from the heater fitting so as to contact an inside of a vertical portion bent in an L shape from an outermost ring portion of the heating element. 3. The heating element of an electric stove according to claim 1, wherein a supporting portion extending radially between the annular portions of the heating element is provided with a projection lower than an upper surface of the heating element.