JPS6150513A - Electric pot - 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 a liquid containing S.

Conventional Example O Configuration and Its Problems Conventional electric boilers of this type have been constructed as shown in FIGS. 1 to 5. That is, at A in the figure, 1. = A heat exchanger plate whose central part is projected upward to form a green 1Δ circle on the outer peripheral side, and the outer edge is attached to the lower end of the cylinder and the diameter of G etc. is d1j. Shape a metal container 2,
It is being revised. 3 (It is an exterior body that wraps the two containers together.

On the bottom surface of the heat exchanger plate 1 mentioned above, there is an electric current;'! ! At i'5:i
From E? , 'Q'ij, C and an auxiliary heat generating part are integrally wrapped together on a heat generating board 4 on top.

Laminated with 5 and 6 layers of insulation on the bottom! S and stretched n.

It has a through hole in its center. This heat generation 24 is built into the lower surface of the heat exchanger plate 1 in a three-view state by a heat diffusion plate 7 having a through hole in the center and a good thermal conductivity having an outer circumferential portion 1j 7a4 and a back side ladle 8. It forms a part. Note that the heat diffusion plate T and the backing material 8 described above are provided with a notch 8a of an appropriate size on the outer peripheral side.

A heat shield plate 9 is provided below the heating element section, and the above-mentioned heat diffusion plate 7 and the notch @7b of the backing material 8 are provided.

A square hole portion of an appropriate thickness is provided corresponding to 82L.

If a temperature controller 1o is attached to the lower center of the heat exchanger plate 1, 'Q
11, and the temperature-sensitive reed switch 12 is installed in the heat diffusion plate 7, the notches 'yb, sa of the backing material 8, and the heating plate 9.
The outside 7'3' of the heat exchanger plate 1 corresponding to the 0-angle hole is held down below the edge; it is attached on three sides by means of springs 13. Further, the above-mentioned main heat generating part is connected to the temperature controller 10, and the auxiliary heat generating part is connected to the temperature sensitive reed switch 12 through an electric circuit to form a parallel circuit, and the heat generating element of the electric water heater and the temperature controller 22 are connected to each other.
It constitutes one plate.

In the above 4 configurations, when the liquid is stored in the container 2 and the field is opened with electricity, the heat generating plate 4 is heated, the heat transfer plate 1 is commanded and heat is transferred to the liquid, and at the same time, the heat is transferred to the scattering plate 7. As a result, the heat will also spread in the direction of your surroundings. Thermal diffusion (anti-7:I7
The heat transferred from - to the placing plate 128 is used to heat the liquid at the outer periphery 'Il'i. When the limbs reach a certain temperature, the temperature connected to the central protrusion of the heat exchanger plate 1? Ag device 1
o is activated, the main heating element is turned off, and only the low-power auxiliary heating element is energized.

When the temperature of the liquid increases further and reaches a certain temperature, the temperature-sensitive reed switch 12 is activated and turns off. When the liquid temperature drops, the temperature becomes 1] The temperature-sensitive reed switch 12, which is turned on first after the controller 1o is activated, turns off, and thereafter repeats the on-off cycle, ensuring a low-power heat retention state. do.

However, in the above-mentioned conventional configuration, each of the components constituting the heating element is arranged in a circular shape, making it difficult to regulate the relative positions of the components, and therefore in the drawer portion of the electric heating heel. Securing the insulation distance 7') 4 is extremely difficult, and it is also very difficult to prevent the entire heating element from rotating, which has a drawback in terms of assembly work 1.

In addition, for heat retention control, a temperature-sensitive reed switch 12 is mounted in a king shape on the lower edge of the outer circumference of the heat exchanger plate 1.
Temperature phase Iy with liquid! In order to increase the performance, it is necessary to reduce the oil repellent area, and for this purpose, it is necessary to reduce the diameter of the central protrusion of the heat exchanger plate 1 by /js. However, if you do it this way.

The projected area of the heating element becomes smaller, leading to warping, resulting in a shortened lifespan of the heating element, and it also has the disadvantage that a sufficient contact area for the temperature-sensitive reed switch 12 cannot be ensured.

Furthermore, for example, when the container 2 is washed without water, that is, when it is completely burnt down, the heat from the heat generating plate 4:
The heat is conducted through the upper and lower insulating plates 5 and 6, but especially in the heat conduction to the heat transfer plate 1, the heat dissipation is insufficient from the so-called heat generation 4 only through the insulating plate 5 with low thermal conductivity. heat transfer plate 1
As a result, the surface of the heat exchanger plate 1 becomes locally heated 770, and a gap is created at the contact area between the heat generation Z4 and the heat exchanger plate 1.

As a result, heat conduction deteriorates, and the heat exchanger plate 1 also has the drawback that discoloration occurs locally on the surface.

OBJECTS OF THE INVENTION The present invention solves the above-mentioned conventional drawbacks, and provides an electric hot water boiler that is excellent in terms of assembly workability, correlation between heating liquid and temperature control device, discoloration life, and heating efficiency. The purpose is to provide the following.

Structure of the Invention In order to achieve the above-mentioned object, the present invention makes the bulge shape of the heat transfer surface on the bottom of the container approximately fissured, and provides good heat conduction between the insulating plate and the heat transfer plate on the top surface of the heat generating plate. By installing a heat dissipating plate in the heating element part, we aim to improve the assembly workability of the steam water heater and the correlation between the heating diffuser and the temperature 1; It is made from a material designed to elongate the front rim and improve heating efficiency.

DESCRIPTION OF THE EMBODIMENTS An embodiment of the present invention will be described below with reference to the side drawings.

In Figures 6 to 11, 21 is approximately D upward from the center.
-T-shaped protruding outer periphery J part edge 214? J: The formed heat transfer plate has a temperature sensing surface 21C on the lower surface of the D-cut circumferential edge 21b, and its outer edge is liquid-tightly welded to the lower end of the segment. In particular, it forms a container 22 made of gold.

23 is an exterior body that encloses the container 22 with a space therebetween.

On the lower surface of the heat transfer plate 21 described above, a heat generating plate 24 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 25 and 26. ggl with good thermal conductivity is placed on the upper surface of the upper loquat plate 25.
A heat diffusion plate 27 is provided. In addition, the heat generation fi2
4 is below the heat exchanger plate 1 by a second heat diffusion plate 28 having a through hole in the center and having good thermal conductivity and a backing material 29 having an outer peripheral side part 282L! It is fixedly built in by spot welding or the like with a presser foot provided to form a heating element.

The first heating wire 3o and the second heating wire 31 of the heating element part
A splint line is provided on the side of each drawer heel (32, 33, 340Δ) by wrapping a non-conductive material, and one end of this splint is wrapped with the second heat diffusion plate 28. They are pressed tightly together. Also, the thickness or wire diameter of the first heating wire 3o and the second heating wire 31 of low power are the same, or the thickness or wire diameter of the second heating wire 31 is larger than that of the first heating wire 3o. It is configured as follows. Moreover, the electric heating panel 24 has a plurality of 7
8-edge core 24Δ+2' bK$ It is constructed in the shape of a child plate by winding a heating wire, and this electric heating board 24 is attached to the upper and lower bag edge plates 25, Insulating cores 24 &, 24b on either one or both of 26
In order to prevent each other from hanging down, a metal piece 35 that is equal to or smaller than the plate thickness or wire diameter of the first heating wire 3o is passed through and bent to be fixed. - 6 insulating cores 24λ are formed on the lead-out end side of the heating wire by providing an appropriate gap between the abutting portions of the insulating cores 24Δ and 24b, and by passing the lead-out wire through the lower bulge 26.

24b Prevent mutual climbing and spread. Furthermore, among the three lead-out glands 32° 33.34, one end of which is a common lead-out line for the first heating wire 3o and the second heating wire 31 of low power, the second heating wire 31 has a common lead-out line. A draw line 33, which is different from the lead line, is located in the center.

Note that the backing material 29 is provided with a notch 29λ of an appropriate thickness on the D-cut outer peripheral side. Further, a substantially Z-shaped container fitting 37 is fixed to the backing material 29 for fixing a handle 36 to a two-tone device to be described later. Further, the D-cut portion of the approximately shaped protrusion of the container 22 is located in the direction of a water level gauge 380 installed on the cylindrical outer wall of the container 22.

Further, the lead line of the heat generating plate 24 is positioned opposite to the substantially D-cut portion of the bottom protrusion of the container 22.

Further, a heat shield plate 36 is provided below the heating element.
This S heating plate 36 is provided with a square hole portion of an appropriate thickness corresponding to the notch 29& of the backing material 29. In addition, a temperature/reaction controller 39 is installed in the center of the heat shield plate 36 by a mounting spring 40, and is integrated with a temperature sensitive reed switch 41 and a temperature fuse A2I by four members. : Press the spring 43 at the corresponding position.
They are temporarily assembled by the following steps, and the wiring board 44 is further fixed. Therefore, this allows you to do major wiring work. Further, this heat shield plate 36 is placed on the bottom surface of the container 22 via the container metal fitting 37, so that the heat receiving parts of the temperature controller 39, the integrated temperature-sensitive reed switch 41, and the temperature fuse 42 are in a tight state. Mounting bracket 45
It is fixed by.

The first heating wire 3o is connected to a temperature controller 39, and the second heating wire 31 is connected to a temperature-sensitive reed switch 41 through electrical circuits to form a parallel circuit, and a temperature fuse 42 is connected in series. Been.

It constitutes an electric water heater.

In the above configuration, when a liquid is stored in the container 22 and electricity is started, the heating block 24 is heated and the W is heated through the insulating plate 25.
The heat is sufficiently diffused by the heat diffusion plate 27 of , 1, and the heat transfer plate 2
Heat is conducted to the liquid via 1. At the same time, heat is also diffused toward the outer peripheral side through the second heat diffusion plate 28.

The heat transferred to the backing material 29 by the second heat diffusion plate 28 is transferred to the outer peripheral side and is used to heat the liquid. When the liquid reaches a certain temperature, the temperature controller 39 coupled to the central protrusion of the heat exchanger plate 21 is activated, and the first heating wire 3
o is turned off, and only the low-power second heating wire 31 is energized. When the liquid reaches a certain temperature due to a further slow temperature rise, the temperature-sensitive reed switch 41 is activated and turns off. When the liquid temperature decreases, temperature controller 3
The temperature-sensitive reed switch 41, which is turned on before 01', is activated and enters the on-state B, and thereafter the on-off cycle is repeated to ensure a low-power heat-retaining state. Furthermore, if the temperature controller 39 remains on due to a failure, the electrical circuit of the temperature fuse 42 is blown, turning off the power to the entire device to ensure safety.

As mentioned above, since the members constituting the heat exchanger plate 21 and the heating element part of the container 22 are partially cut into a substantially oval shape,
The D-cut circumferential edge 21 has a + to ensure positional control between the component parts, especially the heating wire drawer from the heat generating part 24, the second heat diffusion plate 28 and the backing material 2e. This makes it easier and more reliable to ensure an insulating distance from the main body, and improves ease of assembly. Furthermore, assuming that the inner diameter d of the bottom protrusion of the container 22 is constant, K is the integrated temperature-sensitive reed switch 4 in order to improve the temperature correlation with the liquid and improve safety in the event of an abnormality.
It is necessary to increase the contact area between the heat receiving part of the temperature fuse 42 and the temperature sensing surface 21C on the bottom of the container 22, but with the conventional circular heat transfer surface protrusion, the diameter of the protrusion d must be made small, but in this case, a slight reduction in the diameter greatly reduces the projected plane vJ of the protrusion surface of the heat transfer Au21, which in turn shortens the life of the heating element with high watt density. becomes shorter. Also, by making it approximately P5-shaped, the projected area is slightly reduced, making it easier to touch! It is possible to increase the product, and the temperature correlation with the liquid temperature can be made high. In addition, by forming the abbreviated shape, compared to the conventional circular shape, with the same contact area t''!, the distance a from the center point of the protruding part of the rim 9 to the D cut part remains the same, and the heat exchanger plate 21 The projected area of the protrusion can be increased by increasing the diameter d, and as a result, the watt density can be reduced, and the life of the heating element can also be extended.

In addition, since the first heat diffusion plate 27f is added between the insulating plate 26 on the heat generating ff124 and the heat transfer plate 21, the generated heat is sufficiently diffused to the heat transfer plate 21 even in the dry firing state. As a result, discoloration of the surface of the heat exchanger plate 210 can be reduced because it does not result in local heating. Further, since sufficient heat diffusion is performed, the heat conduction area is expanded, and as a result, heating efficiency can be improved.

Furthermore, a temperature controller 39, an integrated temperature-sensitive reed switch 41, and a temperature fuse 42 are attached to the heat shield plate 36 as a temporary assembly before the main assembly, and the wiring board 44 is also fixed with exposure. Part of the wiring work becomes possible, and as a result, temporary assembly can be performed at will separately from the assembly of the main body, so assembly to the main body, that is, assembly to the container 22, can be simplified.

In addition, one end of the heating wire draw-out portion of the heating element portion, which is provided with a splint, is tightly pressed with the second heat diffusion plate 28 and the backing material 29,
In addition, the extension e of the other extension wire 33 other than the common terminal of the low-power second heating wire 31 can be made long;
As a result, reliable crimp pressure can be achieved, heat generation in the lead wire portion can be reduced, and life can be extended. Furthermore, the plate thickness or wire diameter of the second heating wire 31 of low power is the same as that of the first heating wire 3o, or is larger than that of the first heating wire 3o.
As shown in the figure, the insulating plate 26 and the insulating core 244 are pressed against each other to prevent them from digging in. As a result, it is possible to prevent the heating wire from meandering during installation, and also to prevent it from meandering, tangles, and wire breakage. It is possible to extend the time, therefore high 1-+
= can be converted into h.

In addition, since the D cut: TC of the abbreviated protrusion of the container 22 is located in the direction of the water level gauge 38, when cleaning the bottom surface of the container 22, Even if the protrusion falls, it does not become an obstacle, and as a result, cleaning becomes easier.

In addition, in order to keep the power consumption as a heating element within a predetermined standard (trough), the specific resistance (resistance value per unit length) of the heating wire itself or the number of windings must be adjusted. Considering this, 1 near the leader line due to the extra line
A gap is created between the heating wire and the insulating plates 25 and 26, and the heating wire becomes overheated and tends to disconnect from this part.

Therefore, when adjusting power consumption due to improper winding of the heating wire, by doing it in one part, it is possible to prevent the heating wire from overheating and extend its life.

Becomes Noh.

Effects of the Invention As described above, according to the present invention, a roughly shaped protrusion is provided on the bottom surface of a cylindrical container with a bottom, and the back surface of this protrusion is connected to the upper insulating plate constituting the heating element. In between, a first heat diffusion plate with good thermal conductivity is added, which improves ease of assembly, improves the correlation between the heated liquid and the temperature control device, and reduces discoloration during unbaking.
Furthermore, it is possible to improve heating efficiency.

[Brief explanation of drawings]

Figure 1 is a sectional view of the entire conventional electric water heater, Figure 2 is a sectional view of the heating element of the water heater, Figure 3 is a bottom view of the heating element, and Figure 4 is the main components of the heating element. Exploded perspective view of 5th
Figure 6 is a plan view of the heating panel, Figure 6 is a new view of the entire electric water heater showing an embodiment of the present invention, Figure 7 is the heating element of the water heater, and Figure 6 shows the entire electric water heater. sectional view, b is a partially enlarged sectional view, FIG. 8 is an exploded perspective view of the heating element, FIG. 9 is a state in which the heating wire is wound around the heating element, a is a plan view, and b is a plan view. Figure 10 is a plan view showing the temporary assembled state of the heat shield plate, and Figure M11 shows the dimensional relationship between the edge plate 10, the insulating core, and the heating wire. a is a cross-sectional view when the second heating wire has a circular cross section, b is the same -
There is an elevational view of Ur when the FA line is ribbon-shaped. 21... Heat transfer surface, 22... Container, 23
...Exterior body, 25.26 ...Insulation plate,
24.30.31... Heating element, 27...
・First heat diffusion plate, 28...Second heat diffusion plate,
29... Back view, 36... Heat shield plate. 39...Temperature controller, 41...Temperature-sensitive reed switch. Name of agent: Patent attorney Toshio Nakao and 1 other person; 7
C, 21.1 1st Fig. 14 Fig. 5r2 6L21 No. 77 <0-) (b) No. 8 Fig. 29 Mt. 9 Fig. 10 [21 Fig. 11 (o-2 Cb)

Claims (7)

[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 surface protruding from the bottom in an approximately D shape. a heat-generating plate; a flat plate-shaped first heat diffusion member having good thermal conductivity disposed above and below the heat-generating plate; and a peripheral portion on the flat outer periphery; The backing material is made of a second heat diffusion member with good thermal conductivity that is brought into close contact with the container, and has a through hole in the center and is shaped to correspond to the approximately D-shaped protrusion of the container. The heating plate, the first and second heat diffusion members each having a through hole in the center thereof, are placed on the protruding lower surface of the container, and the lead wire portion of the heating plate is placed on a substantially D-shaped cut portion of the heat transfer surface. A temperature controller is mounted in the center of a heat shield plate that substantially covers the bottom surface of the container, and a temperature sensing lead is provided at a position corresponding to the roughly D-shaped cutout of the protrusion of the container. An electric water heater in which a switch is temporarily attached and a heat shield plate is attached and fixed to the bottom of the container. (2) The heat-generating board is provided with a splicing wire made of a good conductive member near the lead-out portion of the heating wire, and one end of the splintering wire portion is tightly pressed with the second heat diffusion member. The electric water heater according to item 1. (3) The heating board has a first heating wire and a second heating wire with a lower power than the first heating wire, and the plate thickness or wire diameter of the first and second heating wires. 2. The electric water heater according to claim 1, wherein the second heating wire has the same thickness or wire diameter as the first heating wire. (4) The heating board is constructed into a flat plate by winding heating wires around a plurality of insulating cores, and either or both of the insulating members are placed above and below before being fixed to the container with a backing material. The electric water heater according to claim 1, which is temporarily fixed to the electric water heater. (5) A common lead-out wire of the second heating wire among the three lead-out wires that have a common terminal at one end of a heating board that has a first heating wire and a second heating wire with a lower power compared to the first heating wire. 5. The electric water heater according to claim 4, wherein the other lead-out line is located in the center. (6) The electric water heater according to claim 1, wherein the approximately D-shaped D-cut portion of the container protrusion is positioned in the direction of a water level gauge provided on the outside of the cylindrical portion of the container. (7) The electric water heater according to claim 1, wherein the temperature-sensitive reed switch is integrated with a thermal fuse.