JPS626807B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a liquid heater for electric heating appliances.

In general, various types of liquid heaters are available on the market, and the shapes and materials of the containers used are wide-ranging, such as metal, glass, ceramics, etc. The outline of the configuration also includes installing a sheathed heater or submersible heater inside the container, strongly crimping a space heater from the bottom of the container, and tightening a band-shaped space heater by wrapping it around the lower body of the container. However, each of these had a hakama part at the bottom of the container, and the whole was constructed with a predetermined electric circuit.

In particular, in the case of liquid heaters that use ceramic containers, thermal efficiency is extremely poor if the heating element is installed at the bottom of the container or in the body, and it is difficult to technically guarantee the temperature correlation between the temperature controller and the heated liquid. It was difficult to do so. As a result, the heating elements used were liquid-tight submersible heaters or sheathed heaters at the top of the inner bottom of the container to increase heating efficiency.
Regarding the above-mentioned temperature correlation, it was still difficult as a technical means. For this reason, many products on the market are generally liquid heaters without a temperature controller. Therefore, in this case, during abnormal use, for example, when the power is not energized or when the liquid level is low, the heating element may be exposed in the air when tilting and pouring while the power is on, and the temperature may rise abnormally. As a result, the vessel was damaged, making it impossible to reuse it, and the fire prevention safety guarantee was inadequate.

Furthermore, the heating element mounting part is generally located at the bottom of the container, and when the container shape is complicated and diverse,
Due to heat shrinkage in the manufacturing process unique to ceramics, manufacturing variations, etc., the shape of the bottom of the container may warp, and as a result,
Deformation occurs, making it difficult to maintain an airtight structure between the heating element and the container mounting part.To solve this problem, the packing is installed while making the holes in the mounting part as small as possible within the structurally acceptable range. It was installed.

Also, regarding cost, the submersible heaters and sheathed heaters are generally expensive as heating elements.
In addition, these heating elements had the disadvantage that cleaning between the bottom surface of the container and the heating element was extremely poor.

The present invention eliminates the drawbacks of the conventional liquid heaters described above, and one embodiment of the present invention will be described in detail below.

1 to 6, reference numeral 1 denotes a porcelain container having an opening at the top and a hole 1a formed in the center of the bottom. An annular projection 1b is provided, and this annular projection 1b forms a curvature shape and hangs downward from the hole 1a in the bottom, and is located at the lowest part of the container 1. 2 is hole 1 of container 1
A is a heating element facing from below. Reference numeral 3 denotes packing interposed between the outer circumference of the heating element 2 and the edge of the hole 1a of the container 1. Annular protrusion 1 of the container 1
On the side part b, a substantially L-shaped locking part 4 is locally installed on the outer periphery facing part. Reference numeral 5 denotes a mounting fitting (locked member) having a substantially inverted L-shaped locked portion 5' that engages with the locking portion 4, and is installed on the lower surface of the container 1 at a portion facing the outer periphery. In addition, the mounting bracket 5 includes a hakama member 6 and a heat shield plate (connection member) 8 to which a mounting spring 7 is attached.
is fixed. The mounting spring 7 urges the heating element 2 upward, and presses the outer circumference of the heating element 2 against the edge of the hole 1a of the container 1 via the packing 3.

The heating element 2 is made by winding a heating wire around an insulating substrate and sandwiching it between upper and lower insulating plates.A heating plate 2a is stacked with a thermally conductive heat diffusion plate 2b such as an aluminum plate. It is constructed by being sandwiched between a heat member 2c and a back member 2d such as an aluminized steel plate. Reference numeral 9 denotes a mounting shaft connected to the central lower surface of the heat transfer member 2c of the heating element 2, and a temperature controller is connected to the mounting shaft 9 via a sensing table 10 made of a good thermal conductivity such as an aluminum bar. 11 are combined. Reference numeral 12 denotes an operation knob of the temperature controller 11, which is provided externally via a back plate 13. 1
Reference numeral 4 denotes a temperature fuse, which is wired to form a predetermined electric circuit with the heating element 2, the temperature controller 11, and the wiring fitting 15 provided on the hakama member 6. In addition,
A peg frame portion is provided corresponding to the wiring fitting attachment portion of the hakama member 6, holding a suction plate 16, and a magnetic device plug 17 is removably installed.

In the above configuration, since the liquid to be heated in the container 1 is in direct contact with the heating element 2, the heating efficiency is extremely high. Temperature controller 11 via
is arranged, the heat shield plate 8 prevents heat radiation from the heat generating element 2 from being transmitted to the temperature controller 11, and furthermore, the heat diffusion plate 2b provided on the heat generating element 2 prevents the heat radiation from the heat generating element 2 from being transmitted to the temperature controller 11.
By lowering the temperature on the back surface of the liquid, the temperature correlation between the liquid to be heated and the temperature controller 11 becomes extremely good, and highly accurate temperature control can be easily performed. Further, a local locking portion 4 formed on the side of the annular protrusion 1b of the container 1 and a locked portion 5' formed on the mounting bracket 5 are engaged with each other with a heat shield plate 8 interposed therebetween. It can be easily attached to the container 1 with just one step, and therefore assembly is extremely simple. In addition, since the heating element 2 is always urged upward by the mounting spring 7 fixed to the heat shield plate 8, and the heating element 2 and the container 1 are fixed by strong pressure and are watertightly attached, it is not necessary to remove the mounting spring 7. As a result, the heating element 2 can be easily attached and detached, and as a result, the above-mentioned assemblability is favorably synergized,
Each component can be serviced easily, and the inner bottom of the container 1 can also be easily cleaned due to the configuration of the heating element 2.

Furthermore, since the annular protrusion 1b of the container 1 forms a curvature shape and hangs downward from the bottom hole 1a, this smooth curvature shape
Thermal shrinkage strain during the ceramic manufacturing process (molding, bisque firing, final firing) is uniform and constant. This makes it possible to prevent warping and deformation of the bottom of the container 1 as much as possible, and to ensure the roundness and horizontality of the hole 1a. Also, as a result, container 1
It is also possible to make the hole 1a at the bottom of the container as large as the design allows, and it is also possible to position the hole 1a considerably above the bottom of the container 1. As a result, temperature control and electrical The height of the hakama member 6 can be reduced within a range that guarantees the mounting dimensions of parts.

In addition, even if the temperature controller 11, temperature fuse 14, etc. malfunction and exhibit an abnormal state and become continuously energized during dry firing, the mounting bracket 5, heat shield plate 8,
Due to the overall structure of the mounting spring 7, the heating element 2 is always fixed to the container 1 without falling downward, thus ensuring safety against abnormal floor temperature rise and fire.

As is clear from the above description, according to the present invention, the liquid-tight structure is easy, the heating efficiency is high, the temperature can be controlled with high precision, and the heating element can be easily attached and detached. To provide a liquid heater whose parts are easily removable, and as a result, the inner bottom of the container can be easily cleaned and the parts serviced, and which is highly safe such as fire prevention and has great industrial value. be able to.

[Brief explanation of the drawing]

FIG. 1 is a front sectional view of a liquid heater showing an embodiment of the present invention, FIG. 2 is a side sectional view of the same, FIG. 3 is a back view with a part of the liquid heater cut away, and FIG. 4 5 is a sectional view of the container of the liquid heater, FIG. 5 is a back view of the container, and FIG. 6 is a sectional view of the heating element of the liquid heater. DESCRIPTION OF SYMBOLS 1... Container, 1a... Hole, 1b... Annular protrusion, 2... Heating element, 3... Packing, 4... Locking part, 5... Mounting fitting (locked member), 7... ...Mounting spring, 8...Heat shield plate (connecting member).

Claims (1)

[Claims] 1 A container with a hole in the center of the bottom and an annular protrusion extending outward from the hole toward the bottom, and a heat generating device arranged in the hole of the container so as to face the inside of the container from below. A liquid heater comprising: a body; and a biasing member that biases the heat generating body upward and presses the outer peripheral end of the heat generating body against the hole edge of a container via packing.