JPH01124418A - Heating elements such as electric water heaters - 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 a heating element used in an electric water heater or the like for heating and keeping a contained liquid warm.

BACKGROUND OF THE INVENTION A conventional heating element of this type for electric water heaters and the like is known, for example, as disclosed in Japanese Patent Application Laid-Open No. 144417/1983.

This consists of a pair of left and right boards 10 as shown in FIGS. 8 and 9.
1 is the main heat generating wire 102 for high heat generation and the heat retention heat generating wire f for low heat generation.
Two strips of i103 are wound with one wire each, and the substrate 1
010 Insulating plates 104 and 105 are provided on both sides, and main heating wires 1o and 2 and heat retention heating wire 1 are installed on the opposite side of the mounting surface.
03 was drawn out, and its drawn-out portion 106 was covered with a plurality of insulators 107, and the surface opposite to the drawn-out portion 106 was held in close contact with a heat transfer plate 108.

Problems to be Solved by the Invention In such a conventional configuration, the main heat generating line M102 for high heat generation and the insulating heat generating line 103 for low heat generation are installed on the pair of left and right boards 1o1.
Since the work involves winding a wire around each one of the wires, it is fine until you wrap one of the heating wires around one board, but if you try to continue winding it around the other board, the finished board will get in the way. In addition to poor workability, the side substrate 101
Problems such as heating wires being bent, broken, or loosened at part A, which is the bridging part, have had a major impact on performance and durability. In addition, the long length of the heating wire poses problems such as not only the work is slow but also the cost of defective products is greatly affected.

The present invention solves the above-mentioned conventional problems, and aims to provide a heating element for electric water heaters, etc., which can significantly improve workability, has excellent performance and durability, and is advantageous in terms of cost. This is the purpose.

Means for Solving the Problems In order to solve the above problems, the present invention separately wraps main heating wires with a rectangular cross section for heating the liquid contained in a pair of substantially symmetrical substrates facing each other, and then - Pass the end of the winding through the positioning holes provided in the pair of facing boards, and
A plurality of connection holes are provided between the two positioning holes, both ends are spot-welded at the connection holes, the other end is pulled out as appropriate, and both sides of the board are covered with insulating plates and pressure-bonded to the heat transfer plate. The structure is as follows.

Function According to the above configuration, the main heating wire can be wound around each substrate separately, so the workability is good and it is advantageous in terms of cost. Furthermore, since the connections between the boards are made after the wire winding work, there are no problems such as bending, disconnection, or loosening of the heating wires, resulting in excellent performance and durability.

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

In FIGS. 1 to 7, reference numeral 1 denotes a heat transfer plate whose central portion projects upward in an abbreviated shape to form an outer circumferential side edge 1a, and this heat transfer plate 1 has a D-cut circumferential side. A metal container 2 is formed by having a temperature sensing surface 1C on the lower surface of the edge 1b and by fixing its outer edge airtightly to the lower end of the cylindrical body by means such as welding.

3 is an exterior body that encloses the container 2 with a space therebetween.

On the lower surface of the heat transfer plate 1, a left and right pair of substrates 6 each having two windings of a main heating wire 4 for boiling water and a heat-retaining heating wire 5 for keeping warm are laminated between upper and lower insulating plates 7 and 8. A first heat diffusion plate 9 having good thermal conductivity is disposed on the upper surface of the upper insulating plate 7. Further, the substrate 6 has a through hole in the center thereof, and the substrate 6 has a presser foot on the lower surface of the heat transfer plate 1 through the second heat diffusion plate 1° having good thermal conductivity and the backing material 11. In the provided state, it is fixedly built in by spot welding or the like to form a heating element portion 12.

The main heating wire 4 and the heat-retaining heating wire 6 are wound around the substrate 6 of the heating element section 12 after being wrapped around separate substrates 6.
As shown in FIG. 6, the main heating wires 4 pass through the respective winding ends 4a through the positioning holes 6a provided in the facing substrates 6, and then the main heating wires 4 are inserted between the positioning holes ea. A plurality (2 to 3) of connection holes 6b are provided in the holes 6b, and the connections are made by spot welding.

As shown in FIG. 6, the heat-retaining heat-generating wire 6 is provided with an L-shaped groove 6c at opposite ends of the substrate 6, and after winding the end of the heat-retaining heat-generating wire 6 around the groove 6C, Groove 6C of e
A connecting member 13 made of a material with good electrical conductivity is used to connect the two.

Reference numeral 14.15 denotes a terminal plate which is provided on the opposite side to the joint part of both the light heating wires 4 and 6 and which constitutes a drawer part.
It consists of terminal plates A14 which are joined together and terminal plates B1's which are individually joined. Said terminal plate A.

The connection between B14 and 15, the main heating wire 4, and the heat retention heating wire 6 is configured such that each heating wire 4.5 is positioned above the mounting hole 6a provided in the board 6, and the terminal plates A and B14 are connected above that. ，
15 mounting surfaces 14a and 15a are positioned and spot welded.

Reference numeral 16 denotes a terminal pottery that insulates and holds the terminal plates A, B 14, and 15. Reference numeral 17 denotes a temperature-sensitive reed switch which is held in pressure contact with the temperature detection surface 1C.This temperature-sensitive reed switch 17 is a good thermal conductor and is integrated with a temperature fuse 18. Reference numeral 19 denotes a temperature controller provided in the center of the heat exchanger plate 1, which is held tightly by a spring or the like. The main heating line 4 is electrically connected to a temperature controller 19, and the heat-retaining heating line 6 is electrically connected to a temperature-sensitive reed switch 17 to form a parallel circuit, and a temperature fuse 18 is connected in series to form an electric water heater. are doing.

The operation of the above configuration will now be described.

When water is poured into the container 2, the temperature of the water is detected by the temperature controller 19 and the temperature-sensitive reed switch 17, and the main heating element 4 and the heat-retaining heating element 5 are energized.

This heat generation causes the temperature of the water to rise. Once the water has boiled, the temperature controller 19 remains OFF, and the heat-retaining heat generating line 5 is then controlled by the temperature-sensitive reed switch 17 to maintain a constant boiling temperature.

Here, since the main heating wire 4 of the heating element section 12 is wound separately around the pair of substrates 6 that are substantially symmetrical on the left and right sides, the workability is good and it is also advantageous in terms of cost.

In addition, the connection between the boards 6 is made by passing the winding end 4a of the main heating wire 40 through the positioning hole 6a provided in the facing board 6, and connecting a plurality of (2 to 3) pieces between the positioning holes 68. hole 6
b and spot welding at the connection hole eb, it is simple and reliable, and as a result, there is no twisting or bending at the bridging part during winding work as in the past. There are no problems such as breakage, disconnection, or loosening, and the performance and durability are excellent.

Effects of the Invention As is clear from the description of the above embodiments, the heating element of the present invention, such as an electric water heater, has the following various excellent effects.

(1) Since the main heating wires are separately wound around a pair of left and right substantially symmetrical substrates, workability is good and it is advantageous in terms of cost.

(2) Since the connection between a pair of boards is made after the wire winding work, there are no problems such as twisting or bending during the winding work, wire breakage, or loosening during assembly, resulting in excellent performance and durability. becomes.

(3) To connect a pair of boards, simply pass the winding ends of the main heating wire through the positioning holes provided on the opposing boards, and do spot welding at the connection holes provided between the two positioning holes. Therefore, you can obtain something simple and reliable.

←) Since the wire is wound on each board on one side, it is easy to develop it into automatic winding.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of an electric water heater using a heating element showing an embodiment of the present invention, Fig. 2 is an exploded perspective view of the heating element, and Fig. 3 is a partially cutaway plan view of the heating element. , Fig. 4 is a partial sectional view of the heating element, Fig. 6 is a sectional view of the joint of the main heating wire, Fig. 6 is a perspective view of the joint of the heat-retaining heating wire, and Fig. 7 is the heating wire. FIG. 8 is a sectional view of a conventional heating element, and FIG. 9 is a plan view showing the winding state of the heating element. 1... Heat exchanger plate, 4... Main heating wire, 4a
... winding end, 6 ... board, 6a ...
...Positioning hole, 6b...Connection hole, 7,8
...Insulating board. Name of agent: Patent attorney Toshio Nakao and 1 other person/-
--Iyun@IL, O and 2 Fig. 2 6-゛One board 2δ・-Sen color edge serious 4-Main sign grip chen 5-I 呆 warm brother line Fig. 3 6- Board 4 Fig. 4- Main heat generating edge Mori 1 port l Wakuotsu --- group' anti-6α, ---I ml La missing da〉1〒to5\;tb・-Dimension large figure 5 figure 6 figure 7

Claims (1)

[Claims] After winding the main heating wire with a rectangular cross section that heats the liquid separately around a pair of substantially symmetrical opposing substrates, one end of the coil is passed through a positioning hole provided in a pair of opposing substrates. , a plurality of connection holes are provided between the two positioning holes, both ends are spot-welded at the connection holes, the other end is pulled out as appropriate, and both sides of the board are covered with insulating plates to improve heat transfer. A heating element, such as an electric water heater, characterized by being pressed into contact with a plate.