JPS6150518A - Electric 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 Industrial Application The present invention relates to an electric heating element used in water heaters for heating and keeping the liquid contained therein.

2. Prior Art Conventional heating elements for this tumor include, for example, the real λ1ii3s6-1
As shown in Publication No. 44495, it was designed as shown in No. 52. In other words, an electric wire was wound around a substantially rectangular insulating core, and the front and back sides of the core were covered with edge plates. The heat generating plate 1 is attached to the back plate 2, and the back plate 2 has U-shaped bent portions 3a provided at the upper and lower parts of the heat transfer plate 3 having good thermal conductivity. 3b, and these were mounted on the inner container 1.11 side of the electric water heater in a tightly doubled state by tightening screws using the mounting bracket 4. An aluminum plate with good thermal conductivity was used for the plate 3, and a surface-treated steel plate, for example, an aluminum-treated steel plate was used for the back plate 2. In addition, the heating wire drawer @ia that constitutes the heating plate 1 was A long-side conductive auxiliary wire 9 was provided, and one end of this auxiliary wire was partially overlapped with the backing material 2 and pressed.

Problems to be Solved by the Invention In such a conventional configuration, one end of the extension line of the lead wire 1a of the heat generating plate 1 is clamped between the heat conductive plate 3 and the back plate 2, but the back plate 2 is Mechanical strength is required for tightening, so it is not possible to use materials such as highly thermally conductive aluminum, and therefore materials with relatively poor heat soaking rates, such as surface-treated steel plates, have to be used. In particular, the heat generated by the lead wire 1a, which has poor heat diffusion conditions, cannot be sufficiently cooled down, and there are many disconnections there. In addition, the back plate 2 is closely held between the bent portions 3a and 3b of the heat conductive plate 3, and the temperature rise of the back plate 2 is radiated through the heat conductive plate 3. By repeating the bending parts 3a, 3
b is opened and the degree of adhesion becomes weak, and as a result, the heat generated on the back side of the heat generating plate 1 cannot be sufficiently transferred to the heat soaking plate 3, causing the temperature of the entire heat generating plate 1 to rise abnormally. The problem is that the temperature condition of the lead wire 1a, which has poor thermal diffusion conditions due to its structure, becomes even worse, resulting in overheating and disconnection.

The present invention solves these problems and aims to provide an electric heating element with excellent durability and safety.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention has a cylindrical shape with a bottom and a heat transfer plate protruding from the bottom in an abbreviated shape.A heating element is mounted on the back side of the bottom of the container. The heating element part includes a heating plate whose upper and lower surfaces are covered with insulating plates, and a peripheral part on the flat outer periphery, which is disposed under the heating plate, and which prevents the protrusion of the container from forming on the peripheral part. The container is made of a heat diffusion member with good thermal conductivity that is brought into close contact with the inner wall of the container, has a through hole in the center, and is molded to correspond to the abbreviated protrusion of the container. In an electric heating element in which the heating plate and the heat diffusion member each having a through hole are fixed to the protruding lower surface of the container, a conductive member is provided near the end of the heating wire pull-out portion of the heating plate. A splint line is applied to the base plate, and one end of the splice line is pressed tightly against the heat diffusion member.

Function: According to this configuration, the heat generated by the lead wire section, which has poor thermal diffusion conditions due to its structure, can be efficiently dissipated by the heat diffusion member with good thermal conductivity, and thereby the temperature rise can be suppressed. Abnormal heat generation from the lead wire portion 1 Rapid oxidation deterioration of the heat generating wire and the extension wire is eliminated, and as a result, durability and safety can be significantly improved.

Embodiment Hereinafter, one embodiment of the present invention will be described based on the accompanying drawings.

In FIGS. 1 to 4, reference numeral 11 denotes a heat transfer plate whose central portion projects upward in an oval shape to form an outer peripheral side edge 11a;
Temperature sensing surface 1 on the lower surface of the D-cut circumferential edge 111)
1C, and its outer edge is liquid-tightly fixed to the lower end of the cylindrical body by means such as welding, thereby forming a metal container 12.

Reference numeral 13 denotes an exterior body that encloses the container 12 with a space therebetween.

On the lower surface of the heat transfer plate 11 described above, a heat generating plate 14 in which a first heating wire and a second heating wire of low power, which will be described later, are integrally wound is placed between the upper and lower insulating plates 15 and 16 (front). A first layer with good thermal conductivity is inserted into the upper surface of the upper insulating plate 15.
A heat diffusion plate 17 is provided. In addition, the heat generating plate 14
is a second heat diffusion plate 1 having good thermal conductivity, which has a through hole in the center, and has an outer peripheral side part 18a and a lead wire through hole 18t).
8 and a backing material 19, the heat exchanger plate 11 is fixedly built in by spot welding or the like with a presser margin provided on the lower surface of the heat exchanger plate 11 to form a heating element portion.

The first heating wire 2o and the second heating wire 2 of the heating element part
1, respective lead lines 22, 23.

A splint line is provided on the end side of part a of 24 by wrapping a long side barrel member, and one end of this splice line is tightly pressed with the second heat diffusion plate 18 and the back side 1. I'm letting you do it.

3. The heating plate 14 is fixed to the upper insulating plate 15 with a fixing metal fitting 25. Also, among the three lead wires 22, 23, and 24, one end of which is a common lead wire for the first heating wire 20 and the second heating wire 21 of low power, the first heating wire 20 has a common lead wire. One of the lead lines 24, which is different from the lead lines, is located at the end of the three parts. Furthermore, a substantially Z-shaped container fitting 27 for fixing a heat shield plate 26, which will be described later, is fixed to the backing material 19.

Further, a heat shield plate 26 is provided below the heating element.

A temperature controller 29 is installed in the center of the heat shield plate 26 by a mounting spring 3o, and a temperature-sensitive reed switch 31 and a temperature fuse 32 are integrated with a good heat conductive material, and corresponds to the notch 19a of the backing material 19. The heat shield plate 26 is attached to the bottom of the container 11 via the container fittings 27, and is connected to a temperature controller 29, an integrated temperature-sensitive reed switch 31, and a temperature-sensitive reed switch 31. Each heat receiving part of the fuse 32 is fixed by a mounting bracket 34 so that each heat receiving part is in close contact with the other. They are each connected to the dosinochii 31 by an electric circuit to form a parallel circuit, and further a temperature fuse 32 is connected in series to form an electric water heater.

In the above configuration, when a liquid is stored in the container 11 and electricity is started, the heat generating plate 14 is heated, the heat is sufficiently diffused by the first heat diffusion plate 17 via the insulating plate 15, and the heat transfer plate 11
Heat is transferred to the liquid through the At the same time, heat is also diffused toward the outer peripheral side through the second heat diffusion plate 18. The heat transferred by this second heat diffusion plate 18 is transferred to the outer periphery 5i.
It is transmitted to part 11 1Ba and is used for heating the liquid. When the liquid reaches a certain temperature, the temperature controller 29 connected to the central protrusion of the heat transfer plate 11 is activated, the first heating wire 2o is turned off, and the low-power second heating wire 2o is turned off. Only the heating wire 21 is energized. When the liquid reaches a certain temperature due to a further slow temperature rise, the temperature-sensitive reed switch 31 is activated and turns off. When the liquid temperature decreases, the temperature-sensitive reed switch 31, which is turned on before the temperature controller 29, is activated and turns on, and thereafter the on-off cycle is repeated to ensure a low-power heat retention state. Furthermore, if the temperature controller 29 remains on due to a failure, the electrical circuit of the temperature fuse 32 is blown, turning off the power to the entire device to ensure safety.

With this configuration, one end of the heating wire draw-out portion of the heating element section on which the splicing line is applied can be securely pressed and tightly pressed between the second heat diffusion plate 18 and the backing material 19, and the first electric wire Since the outlet of the other lead wire 24, which is different from the common terminal of the hot wire 20, is located at the end of the three wires, the presser allowance and C of the splicing wire portion of the high-wattage lead wire 22 and 24 are , the insulation distance from the second heating wire 21 can be long even if it is ensured, and as a result, reliable clamping of the splicing wire can be performed, so the lead wire 22. 24 is efficiently radiated to the heat transfer plate 11 and the liquid in the container 12 via the second heat diffusion plate 18, and the temperature rise of the lead wires 22 and 24 can be suppressed. As a result, rapid oxidation and deterioration of the heating wires and auxiliary wires due to abnormal heat generation from the lead wire section will be eliminated, and there will be no adverse effects on other body components due to disconnection or heat generation from the lead wire section, improving durability and Safety can be significantly improved.

Effects of the Invention As is clear from the above-mentioned embodiments, the air heating element of the present invention is designed so that one end of the extension wire of the heating wire is tightly pressed with a heat diffusion member having good thermal conductivity. As a result, the heat generated by the heating wire can be efficiently dissipated through the heat diffusion member, and as a result, the increase in the 1j height of the heating fitting can be suppressed to a low level. Rapid oxidation deterioration of the auxiliary wires is eliminated, and the adverse effects of heat traps on other vessel components are also eliminated, so durability and safety can be significantly improved.

[Brief explanation of the drawing]

FIG. 1 is a plan view of an electric heating element showing an embodiment of the present invention;
Figure 2 is a longitudinal cross-sectional view of an electric water heater that uses the same heating element.
Figure 3 shows the disassembly of the heating element of the same water heater?・(View, 4th
FIG. 4 is an enlarged sectional view of the heating element, and FIG. 5 is a perspective view of the conventional heating element. 11... Heat exchanger plate, 12... Container, 14... Heat generation, 15... Upper insulating plate, 16... Lower insulating plate, 18... 20th... Heat diffusion plate (heat diffusion member), 19
...Backing material, 20...First heating wire, 2
1...Second heating wire, 22.23.24...
・Leader line part. Name of agent: Patent attorney Toshio Nakao and 1 other person/4
,,, release board//... Main connection to the main body (but, diffusion member 2/a Fig. 4(b) Fig. 5

Claims (2)

[Claims] (1) A heating element is attached to the back side of the bottom of a container that is cylindrical with a bottom and has a heat transfer plate protruding from the bottom in an approximately D shape. It is composed of a heat generating plate, and a heat diffusion member having good thermal conductivity, which is disposed under the heat generating plate, has a peripheral edge on the flat outer periphery, and is brought into close contact with the inner wall of the protrusion of the container at this peripheral edge. , has a through hole in the center,
The heat generating plate and the heat diffusion member, each having a through hole in the center thereof, are fixed to the lower surface of the projecting part of the container by a backing material formed to correspond to the approximately D-shaped projecting part of the container. In the electric heating element, the heating plate is formed by providing a splicing wire with a good conductive member near the lead-out wire portion of the heating wire, and tightly pressing one end of the splint wire with the heat diffusion member. (2) The heating panel has three drawers that have a first heating wire and a second heating wire that has a lower power than the first heating wire, and one end of both heating wires is a common terminal. The heating wire according to claim 1, wherein the lead wire of the first heating wire, which is different from the common lead wire of the first heating wire, is located at either of the ends other than the center. Electric heating element.