JPS58104447A - Electric water boiler - Google Patents

Abstract

PURPOSE:To provide the titled boiler with a simple construction and at low cost by mounting a heat generating member in a penetrating hole formed on the bottom surface of a porcelain bottomed vessel thrugh a heat-resisting packing, and further fitting a skirt member to an engaging stage part formed on the outer bottom surface of the vessel through an engaging member. CONSTITUTION:The penetrating hole 2 is provided on the bottom surface of the porcelain bottomed vessel 1. A heat generating member 4 is fitted in the penetrating hole 2 through a heat-resisting packing 5. Further, an engaging stage part 3 is formed on the outer bottom surface of the vessel 1. The skirt member is fitted in the engaging stage part 3 through an engaging member 12 engaged with the engaging stage part 3. That is, in a case where the vessel is formed of porcelain, it results in a simple construction, easy assembling works, being manufactured at low cost.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a water heater having an electric heating element, and in particular, when the container is made of ceramic, it is an object of the present invention to simplify the construction and provide a water heater that is inexpensive. .

Conventionally, in this type of water heater, a through hole was provided at the lower side of a ceramic container, and a sheathed heater was installed in this through hole. This sheathed heater generates heat in the water inside the container, so the temperature of the heating element is low, and the heat generation density is 6 to 15 W.
/ c4 and high density, the shape was miniaturized. For this reason, if you accidentally turn on electricity to the heating element without filling the container with water,
The temperature of the heating element rose rapidly, often causing the heating wire to break or the metal outer tube or backing of the sheathed heater to break.

In addition, the temperature of the water in the container can be controlled by placing a liquid expansion type thermal sensor into the water in addition to the heating element, detecting the water temperature, and controlling the energization. There was a method in which a temperature controller was attached to the container to indirectly detect the temperature of the water in the container and control the electricity supply.

For this reason, even if the heating element is energized without filling the container with water, the heating element and temperature regulator are installed separately, making it impossible to control the sudden temperature rise of the heating element, resulting in abnormal temperatures. It was not possible to prevent the rise. Temperature fuses have been used to prevent damage and fires caused by such abnormal temperature rises, and are separate from the temperature regulator that controls the temperature of the water inside the container. The use of separate temperature fuses to prevent abnormal temperature rises and temperature regulators to control the temperature of the water in the container made them expensive.

The present invention solves the above-mentioned conventional drawbacks, and one embodiment of the present invention will be described below with reference to FIGS. 1 to 3.

1 is a ceramic container, and the bottom of this container 1 has a through hole 2,
An annular engaging step portion 3 having an angular cross section is made to protrude downward from the outer bottom surface. Reference numeral 4 denotes a submersible heating element that is watertightly provided in the through hole 2 of the container 1 via a banking 5 made of heat-resistant silicone rubber or the like.

A mounting member 6 is made to protrude downward from the center bottom of the underwater heating element 4, and a mounting member 6 is provided at the center of the outer surface of the mounting member 6.
A ring-shaped groove 7 is provided.

8 is a spring retaining ring having a plurality of claws on its inner periphery.

The retaining ring 8 has a retaining metal fitting 9 and a cushioning rubber backing 10 stacked above it, and the claw at the lower end of the retaining ring 8 is engaged with the ring-shaped groove 7 to urge the submersible heating element 4 downward. ing.
□ 11 is a synthetic resin hakama member provided on the lower surface of the container 1. This hakama member 11 is fastened to a locking member 12 made of synthetic resin that engages with the engagement step 3 of the container 1 with screws 13, so that the container 1 and the hakama member 11 are held.

Reference numeral 14 denotes a lining that covers the bottom opening of the hakama member 11;
It is fixed at 1. 16 is a lid placed on the container 1. A more detailed explanation of the structure of the submersible heating element 4 will be given with reference to FIG. Reference numeral 16 denotes a heat generating member formed of a heat generating material 17 made of a mica plate and a heat generating wire wound thereon, an upper insulating layer 18 such as a mica plate having excellent heat resistance, and a lower insulating material 19. The heat generating member 16 has a through hole 20 in its center.

Reference numeral 21 denotes a round plate-shaped upper seam plate made of stainless steel and having a bulge portion projecting upward in the center. Reference numeral 22 designates a round plate-shaped lower seam plate having a stepped through hole whose central portion protrudes downward. The heat generating member 16 is placed on the lower seams 11y and 22, and the outer circumferential edge of the upper seam plate 21 and the inner circumferential edge of the upper end of the lower seam plate 22 are fitted together, and pressure is applied from above and below to close the upper seam. The outer corner ends of the plate 21 and the lower seam plate 22 are watertightly joined by welding. A mounting member 6 is fitted into the stepped through hole of the lower seam 22 at the position of a circular wedge-shaped protrusion 23 provided at one end thereof. A ring-shaped groove 7 is provided at the center of the outer surface of the mounting member 6, and a curling portion 2 is provided at the entire circumference of the other end.
4, a through hole 25 is provided on the lower surface. 26 is a thermostat, which is provided in the through hole 2o of the heat generating member 16.

A spacer 27 is made of a heat-resistant insulating material such as ceramic and has a coil spring 28 telescopically inserted into a recess at the bottom. Both ends of the spring-like mounting bracket 29 provided below the spacer 27 are connected to the curling portion 2 of the mounting member 6.
4, the end surface of the coil spring 28 protruding from the recess of the spacer 27 is joined to the mounting bracket 29, and the spacer 27 is urged upward by the mounting bracket 29, so that the upper surface of the spacer 27 The thermostat 26 is held under the pressure of the upper seam plate 21.

Next, the effects of the above configuration will be explained. First, when water is poured into the container 1 and electricity is applied to the submersible heating element 4, the heating material 1
7 generates heat, and the water in the container 1 is heated through the upper seam &21 and the lower seam plate 22, and becomes hot water. thermostat 2
6 is heat-sensitively attached within the upwardly projecting bulge of the upper seam 21, so it operates by detecting a temperature equivalent to the water temperature. Even if the submersible heating element 4 is energized without filling the container 1 with water by mistake, the thermostat 26 is pressed and held by the upper seam plate 21, so the thermostat 26 will stop the water in the container 1 within a short time. It is possible to detect the temperature and stop the electricity supply. This can prevent the heating wire from being disconnected due to a sudden temperature rise in the submersible heating element 4.

In addition, on the outer bottom of the container 1, there is an annular retaining step 3 with an angular cross section.
is provided, and the locking member 12 is engaged with the engagement step portion 3,
Since the container 1 and the hakama member 11 are joined by fastening the locking member 12 and the hakama member 11 using the screws 13, the structure is simple and assembly is easy.

As is clear from the above description, according to the present invention, the heating element is provided in the through hole provided in the bottom of the ceramic container via the heat-resistant backing, so the configuration is simple and the container is The structure can be simplified by connecting the container and the hakama member by providing an engaging step on the outer bottom surface, engaging the locking member with the engaging step, and fastening the locking member and the hakama member. It is easy to assemble, and its industrial value is high.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of an electric water heater showing an embodiment of the present invention;
FIG. 2 is a cross-sectional view of the essential parts, and FIG. 3 is a partially cross-sectional side view of the submersible heating element in the electric water heater. 1...Container, 2...Through hole, 3...
- Engagement stepped portion, 4... Submersible heating element, 5...
・Backing, 10...Buffer rubber backing,
11... Hakama member, 12... Locking member. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 5

Claims (1)

[Claims] A through hole is provided in the bottom of a ceramic bottomed container, a heating element is attached to the through hole through a heat-resistant backing, a locking step is formed on the outer bottom surface of the bottomed container, and a locking step is formed on the bottom of the bottomed container. An electric water heater in which a locking member is locked and a hakama member is attached to the locking member.