JPH02149226A - electric water 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 the Invention The present invention relates to an electric water heater for heating and keeping a contained liquid warm.

BACKGROUND OF THE INVENTION The conventional heating element of this type of electric water heater is No. 427\-
As shown in FIG.
By winding 02 and the auxiliary heating wire 103 for heat insulation,
It constituted a heating element 104. In this case 1, this method was fine for the main 100V rated products, but for the 200V rated products sold overseas, due to the resistance value, the main heating wire and the auxiliary It is impossible to wind the heating wires together, so in the conventional method, as shown in FIG.
04 and the substrate 207 around which the auxiliary heating wire 206 is wound, and insulating them.
A heating element portion 211 was constituted by the two-layer heating element of the second heating plate 210 formed by the lower mica 20B and 209.

Problems to be Solved by the Invention However, in the conventional configuration shown in FIG. 5, the number of parts is smaller than in the structure shown in FIG. As a result, the material cost rises, and when the heating wires 201 and 206 are made in two layers, it is necessary to wrap the heating wires 201 and 206 and process the lead wires, and to stack the two layers of the heating plates 206 and 210. However, there are problems in the workability of the heating element part 211, and the processing cost increases.

In addition, in terms of commonality of parts with the heat generating elements in the - layer, in the case of two layers, the thickness of the heat generating element portion 211 increases, so the depth of the seam plate that holds these heat generating elements changes. In some cases, a new and separate seam plate is required, and in such cases, it is sufficient to use a large amount of double-layer heating elements, but since it is likely to be used in small quantities, it is not necessarily necessary to invest in molds. Therefore, manufacturing new parts was not a good solution in terms of cost.

The present invention is intended to solve these problems.

The object of the present invention is to provide an electric water heater that minimizes new investment, takes into consideration the processability of the heating element, and has a heating element that is also excellent in reliability and durability.

Means for Solving the Problems In order to solve the above problems, the present invention includes a bottomed cylindrical container and a heating element that heats the liquid contained in the container.
The heating element is placed on the back side of a heat exchanger plate provided on the back side of the bottom of the container.
The first insulating plate consists of an upper insulating plate, a heating plate wrapped with the main heating wire, a lower insulating plate, and a heat diffusion plate with good thermal conductivity, which are laminated in sequence, and these are attached to the back surface of the heat transfer plate by pressure bonding using a backing material. An auxiliary heating element for low power use is constructed by wrapping the heating element and a cord heater covered with a highly conductive material around the lower outer periphery of the container.

It is configured by a second heating element.

Effect With the above-mentioned configuration, it is only necessary to wind the main heating wire around the first heating element provided at the bottom of the container.In this case, by reducing the winding pitch, the main heating wire can be wound. Since the length can be made relatively long, the cross-sectional area of the main heat generating area can be increased, and as a result, durability can be significantly improved.

5. A second heating element constituting an auxiliary heating element for still low power use,
Since it is composed of a cord heater, short circuits and disconnections due to slack in the heating wire are significantly reduced compared to the conventional one wrapped around a -r squid board, resulting in improved reliability and durability. This has a great effect.

EXAMPLE Hereinafter, an example of the present invention will be described based on FIGS. 1 to 3. In the figure, a spout 2 is fixed to the upper end opening of a substantially cylindrical body 1, and a spout 3 is integrally attached to the lower end of the body 1. The spout 2 is covered by a lid 4 that can be opened and closed freely, and the lid 4 can be attached to and removed from the spout 2 by pressing a lock knob (not shown) provided on the front surface of the lid. It is composed of

The body 1 is still equipped with a cylindrical container 5 with a bottom, and on the back side of the bottom surface 6 of the container 6 is a flat steel plate made of aluminum or the like with good thermal conductivity and subjected to surface treatment. A first heating element 8 is attached via a heat exchanger plate 7 made of, for example.

6 ・\-/ The first heating element 8 is on the back surface of the heat exchanger plate.

Upper insulating plate 9. A heating plate 11° around which the main heating wire 10 is wrapped, a lower insulating plate 12. Thermal diffusion plates 13 made of materials with good thermal conductivity such as aluminum and steel are laminated one after another, and these are combined into a backing material 14 with excellent thermal conductivity such as a surface-treated steel plate.
It is constructed by being attached to the back surface of the heat transfer plate 7 in a crimped state.

A cord heater 15 is wrapped around the lower outer circumference of the container 5.
The second heating element 16 is a cord heater 15 insulated by a silicone tube, a glass braided sleeve, etc.
Adhesive tape is pasted on both sides of the
7 is pasted, and the surface opposite to this aluminum foil 17 is pasted along the lower outer periphery of the container 6. This is to keep the liquid inside the container 5 warm. It constitutes an auxiliary heating element for small electric power.

The temperature of the liquid in the container 6 is detected by a liquid temperature detection pin 18 provided at the bottom of the container 5. The heat shield plate 19 is used not only to shield heat from the first heating element 8 but also as a base for mounting one component.

As is clear from the above configuration, the first heating element 8 is connected to the container 5.
In this case, the second heating element 16 is provided at the bottom outer periphery of the container 5.

The second heating element 16 requires a small amount of power, so when the liquid in the container S decreases, it will not become dry-fired.
Therefore, even if it is used until the amount of liquid is reduced, there is little effect on the lifespan of the heating element.

Effects of the Invention As described above, according to the present invention, a heating element that completely heats the liquid contained in a cylindrical container with a bottom is attached to the upper insulating plate on the back side of the heat transfer plate provided on the back side of the bottom of the container. A heating plate wrapped with wire,
The first insulating plate and the heat diffusion plate with good thermal conductivity are laminated in sequence, and these are attached to the back surface of the heat transfer plate by pressure bonding using the backing material.
with a heating element.

A cord heater covered with a material with good thermal conductivity is wrapped around the lower outer circumference of the container, and a second heating element is constructed to constitute an auxiliary heating element for small power use. It is sufficient to simply wind the main heating wire around the provided first heating element, and in this case, if the pitch of each winding is made small,
Since the length of the main heating wire can be made relatively long, the cross-sectional area of the main heating wire can be increased, and as a result, the #+ durability can be significantly improved.

In addition, the second heating element constituting the auxiliary heating element for small electric power is
Since it is composed of cord heaters, short circuits and disconnections due to slack heating wires are significantly reduced compared to conventional ones wrapped around mica plates, resulting in significant improvements in reliability and durability. 2 with a simple configuration such as having
It is possible to provide an electric water heater having a heating element for 0OV.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of essential parts of an electric water heater showing an embodiment of the present invention, FIG. 2 is a longitudinal cross-sectional view showing the overall configuration of the electric water heater, and FIG. 3 is a first cross-sectional view of the electric water heater. Top view of the heating element,
Figure 4 is a top view of the heating element in a conventional electric water heater.
FIG. 6 is an exploded perspective view of the heating element. 9″ 6... Container, 6... Bottom of container, 7.
... Heat exchanger plate, 8 ... First heating element, 9.
...Top insulating plate, 10...Main heating wire, 11
...Heating plate, 12...Lower insulating board, 13
... Heat diffusion plate, 14 ... Back material, 15
...... Cord heater, 16... Second heating element. Name of agent: Patent attorney Shigetaka Awano and 1 other person7-
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Claims (1)

[Claims] It includes a bottomed cylindrical container and a heating element that heats the liquid contained in the container, and the heating element has an upper insulating plate and a main heating wire on the back side of a heat exchanger plate provided on the back side of the bottom of the container. A first heating element is made by sequentially laminating a wrapped heating plate, a lower insulating plate, and a heat diffusion plate with good thermal conductivity, and these are attached to the back surface of the heat exchanger plate in a crimped state using a backing material, and the lower outer periphery of the container. and a second heating element which constitutes an auxiliary heating element for low power consumption by wrapping a cord heater covered with a highly conductive material.