JPH0317792Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to an electric water heater, particularly to a mounting structure for a heating element.

(Prior art) For electric water heaters, for example, Japanese Patent Application Laid-Open No. 58-104447
There is an idea shown in the publication. In this example, the heating element has a T-shape consisting of a heating element part and a mounting member provided below them, and the mounting member has heat-resistant packing such as silicone in a through hole formed in the bottom of the bottomed container. A retaining ring is attached from the outside to apply a biasing force, and the retaining ring is attached to the bottom plate.

That is, the heating element portion of the heating element is disposed so as to protrude into the container in an unstable manner, and watertightness is obtained by heat-resistant packing.

(Problem to be solved by the invention) However, when washing the inside of the container, the heating element is also washed, and at this time, the heating element protrudes in an unstable state, so naturally There was a risk that the heat-resistant packing would deteriorate due to the force (direction) applied thereto and the heat emitted by the heating element, resulting in loss of watertightness and water leakage.

Therefore, the purpose of this invention is to prevent water leakage from the mounting portion of the heating element.

(Means for solving the problem) The gist of this invention is that a cylindrical upper case 1a,
Provided below the upper case 1a, the upper case 1
a, a metal case 13 that forms the bottom of the water boiling chamber 5 and has a desired shape, and a heater coil 17 arranged on the back side of the metal case 13.
and an elastic ring 26 which has a fitting groove around the heating element 6 and is held between the upper case 1a and the lower case 1b. .

(Function) Therefore, since the heating element is sandwiched between the upper case and the lower case screwed into the bottom surface via the elastic ring fitted around the heating element, the heating element is not heated. Although the body protrudes, it is not in an unstable state, and it is not subjected to much force during cleaning, and the elastic ring is relatively far from the heating element, so it is less affected by the heat generated from the heating element. , the above objective can be achieved.

(Example) Hereinafter, an example of this invention will be described with reference to the drawings.

In FIGS. 1 to 3, the upper case 1a of the electric water heater has a substantially cylindrical shape, and has a spout 2 at the top.
is formed, and a lid 3 is screwed into the spout 2. 4 is a cover that wraps over the lid 3, and the upper case 1
It is screwed into a.

The lower part of the upper case 1a is open, and a heating element 6 is attached to the opening as described below, forming a bottom surface and a water boiling chamber 5.

A screw 7 is formed on the lower outer periphery of the upper case 1a, and a lower case 1b is screwed to the lower case 1b, which is provided with a screw 8 that is screwed into the screw.

The lower case 1b has the screw 8 inside its opening.
is engraved, and a step 9 is formed in the middle part of the inside.
Further below, a bottom body 10 is integrated by welding and caulking the tip of a connecting rod 11.

The diameter of the heating element 6 is approximately equal to the lower diameter of the upper case 1a, and the heating element 6 has a disk shape with a central portion protruding toward the water boiling chamber 5 side. The heating element 6 has a metal case 13 on the outside, has a lower part 14 in the center, and has a substantially doughnut-shaped protrusion 15. On the side of the metal case 13 opposite to the water boiling chamber, there is a recess 16 that is on the back side of the protrusion 15 and corresponds to the protrusion 15 . A heater coil 17 is disposed in the recess 16 with a ceramic insulating material 18 interposed therebetween, and an inorganic material 19 such as cement is disposed therebetween.
is packed into the entire recess 16. Also,
A support plate 21 for a temperature switch 20 such as a thermostat is mounted on the lower surface 4 (on the side opposite to the water boiling room) of the metal case 15.
is attached. The support plate 21 is approximately disk-shaped and has the same diameter as the metal case 15, and the temperature switch 20 is attached through a hole 22 formed in the center.

The temperature switch 20 sets the temperature of the hot water to, for example, 90°C.
The temperature switch body 20a controls the temperature back and forth.
and a mounting piece 20b that wraps and supports the temperature switch main body 20a, and this mounting piece 20b and the support plate 21 are connected with screws 23.
At this time, one side of the screw 23 should be connected to the temperature fuse 2.
It supports the mounting piece 25 which holds 4. The support plate 21 of the temperature switch 20 is attached to the back side of the metal case 13 of the heating element 6.

The temperature fuse 24 is provided at a position away from the temperature switch 20, and its cutoff temperature is, for example,
The temperature is around 120℃.

The elastic ring 26 is ring-shaped and has a fitting groove 27 formed on its inner surface into which the outer peripheries of the metal case 13 and the support plate 21 fit.

The heating element 6 is integrated with a support plate 21 attached to the back surface of the metal case 13, an elastic ring 26 is fitted on the outer periphery, and then the lower case 1b is assembled.
By placing the upper case 1a on the stepped portion 9 of the lower case 1b, both cases 1a and 1b are removed.
Then, the metal case 13 and the like of the heating element 6 are clamped and attached. Note that both cases 1a and 1 are connected with screws 12.
b is fixed.

28 is a handle provided on the upper case 1a;
9 is an electric wire, and 30 is a plug for inserting a cigarette for an automobile.The connections with the heater coil 17, temperature switch 20, and temperature fuse 24 are as shown in FIG. When the heater coil 17 is inserted into the cigarette socket of the vehicle, electricity is applied to the heater coil 17 from the power source of the vehicle and the heater coil 17 is heated. 31 is an engagement piece provided on the bottom body 10 of the lower case 1b.

In the above-described configuration, when the plug 30 is attached to an automobile cigarette socket, the heater coil 17 is energized and water is boiled in the water boiling chamber 5. And the temperature is 90 with temperature switch 20.
It is controlled around ℃.

(Effects of the invention) As described above, according to this invention, since the heating element is mounted between the upper case and the lower case via an elastic ring, no problem occurs even if the heating element protrudes toward the boiling water chamber. It is not in a stable condition, but is securely installed and sufficiently watertight. Further, since the elastic ring is relatively thick and a metal plate is inserted from the inner surface thereof, twisting does not occur even when the upper case and the lower case are screwed together. In addition, the elastic ring of the fit around the heating element is relatively far away,
Since the influence of the heat generated from the heating element is small, it is sufficient to prevent water leakage from the elastic ring.

Furthermore, the metal case of the heating element is made of a single plate, which is advantageous for watertightness.

[Brief explanation of drawings]

Fig. 1 is a half sectional view showing an embodiment of this invention, Fig. 2 is an enlarged sectional view of the main part, Fig. 3 is an exploded perspective view of the heating element and the mounting plate and elastic ring attached to its lower part. Figure 4 is a circuit diagram of this invention. 1a... Upper case, 1b... Lower case, 6... Heating element, 26... Elastic ring, 27... Fitting groove.

Claims (1)

[Claims for Utility Model Registration] A cylindrical upper case 1a; a lower case 1b provided below the upper case 1a and screwed together with the upper case 1a; A heating element 6 consisting of a metal case 13 and a heater coil 17 disposed on the back side of the metal case 13, and a fitting groove for fitting is provided around the heating element 6. An electric water heater characterized by comprising an elastic ring 26 held between the case 1b and the case 1b.