JPS6217143B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a liquid heater such as an electric water heater or an electric sake brewer.

Generally, in the case of a liquid heater, a sheathed heater and a submersible space heater are installed in the lower space inside a cylindrical container that is open at the top, or a band-shaped heater, space heater, etc. are installed on the outer bottom of the container. It was installed.

However, in the case of a liquid heater using a sheathed heater, the cost is generally high, including the electrical insulation treatment of the terminal part of the sheathed heater, and the power density cannot be set to a high wattage due to shape constraints. It also had the disadvantage that it was difficult to clean between it and the bottom surface.

In addition, in the case of a liquid heater using a submersible space heater, the heating plate is sandwiched and crimped with metal plates from above and below, the outer periphery is caulked and fixed, and sealing processing such as welding is required. This method requires the use of a metal plate, resulting in high costs, and has the disadvantage that cleaning between the heating element and the bottom of the container is extremely difficult.

For band heaters and space heaters,
Although the cost is relatively low, thermal efficiency is poor because the heating element is installed through the container, and as a means to compensate for this, it was necessary to form the container from a metal with good thermal conductivity, such as aluminum. .

An embodiment of the present invention will be described in detail below.

In the drawings, reference numeral 1 denotes a dish-shaped heat transfer member having a flange 2 on its periphery, and the shape of the flange 2 is as shown in FIG. 4 or 6. 3 has a collar part 4 on the periphery
It is a dish-shaped back member having a bottom surface with a protrusion 6 having a through hole 5 in the center. 7 is a heating plate formed by wrapping a heating wire 9 around a ring-shaped insulating substrate 8; 10 is a heating plate formed by wrapping the heating wire 9 around a ring-shaped insulating board 8;
1 and 11, and join the flange 2 of the heat transfer member 1 and the flange 4 of the back member 3, as well as the bottom surface of the heat transfer member 1 and the protrusion 6 of the back member 3, respectively. It is arranged in a space formed around the protrusion 6 when the two are integrated. Reference numeral 12 denotes a ring-shaped heat diffusion plate located between the heat generating plate 10 and the back member 3, and is made of a metal plate with good heat conductivity such as aluminum, copper, or steel, and the peripheral portion is covered with a heat transfer member. 1 and back member 3
are in contact with each. A lead wire 13 is drawn out from the heat generating plate 10 and inserted into the insulated pipe 14. 15 is a heating element formed as described above; 16 is a container having an opening 18 having a lid 17 on the upper top and an opening 19 on the lower bottom; 2
0 is the collar 2 of the heating element 15 inserted into the opening 19
21 is a mounting bracket fixed to the outer bottom surface of the container 16, 22 is a hook fixed to the lower part of the container 16, and the lead wire 13 of the heating element 15 is It is guided to the terminal 23 of this hook portion 22 to form an electric circuit. As shown in FIG. 1, if the outer dimensions of the heating element 15 are larger than the diameter of the opening 18 of the container 16, the collar 2 of the heating element 15 should be shaped as shown in FIG. 21 and the mounting spring 24 to press and connect the heating element 15 to the bottom of the container 16. Further, as shown in FIG. 2, if the outer dimensions of the heating element 15 are smaller than the diameter of the opening 18 of the container 16, the collar 2 of the heating element 15 should be shaped as shown in FIG. 21 and screws 25 to attach the heating element 15. Therefore, the liquid to be heated is the heating element 1
It is heated by direct contact with 5.

If the terminal 23 is now connected to the power source and a current is passed through the heating element 15, the temperature of the heating wire 9 will reach a certain level,
The generated heat is immediately diffused almost uniformly throughout the heating element 15 by the heat transfer member 1 and the heat diffusion plate 12, and is transferred to the liquid to be heated.

For this reason, thermal efficiency is extremely good, and since the heating element 15 is in direct contact with the liquid to be heated, the temperature of the heating wire during energization of heat generation can be significantly lowered, and the temperature of the component parts can also be lowered. This prevents thermal deformation of the parts and, as a result, extends the durable life of the heating element. Furthermore, if the durability life is set to the same level as conventional space-type heaters, the power density can be considerably increased, and the overall size of the heating element can also be reduced.

Furthermore, irrespective of the size of the opening 18 at the top of the container 16, the heating element 15 can be easily attached by providing an opening 19 in the bottom surface corresponding to the dimensions of the heating element 15. Moreover, cleaning and maintenance are extremely easy, and by using a corrosion-resistant metal for the heat transfer member 1, it is possible to prevent corrosion due to use over time, and a wide range of materials can be used for the container 16, such as stainless steel, porcelain, and glass. .

As described above, according to the present invention, between the heat transfer member and the back member each having a collar portion on the outer periphery,
A heating element formed by wrapping a heating wire around an insulating substrate is disposed, and the heating element is formed of a metal plate with good thermal conductivity located on the back side of the heating plate, and the peripheral edge is connected to the heat transfer member and the back side. A heat diffusion plate is placed in contact with each of the members, and the brim of the heat transfer member and the brim of the back member are joined together, and the bottom surface of the heat transfer member and the central protrusion of the back member are joined to integrate the two. This heating element is attached to an opening provided at the bottom of the container through packing, and when an electric current flows through the heating element and heats it up, heat is generated from the top surface of the heating plate. The heat is immediately transferred to the heat transfer member and can directly heat the liquid in the container, and the heat from the bottom surface of the heat-generating plate is quickly transferred to the periphery of the heat diffusion plate, and this periphery Since the is in contact with the heat transfer member, the heat from the heat diffusion plate is also actively transferred to the heat transfer member, contributing to the heating of the liquid in the container, and is further conducted to the back member through the heat diffusion plate. Since the outer periphery and center of the back member are joined to the heat transfer member, the heat generated can be actively transferred to the heat transfer member and contribute to heating the liquid in the container. Since the structure is designed to actively promote heat diffusion and heat transfer between each member, the wire temperature of the heating wire itself can be significantly lowered, extending the durability life of the heating element itself, and ensuring good heating. Efficiency can be guaranteed, and since this heating element is attached to the opening at the bottom of the container via packing, the heat generation is not affected by the size of the opening at the top of the container. Not only can the body be attached to it, but it can also be easily cleaned and maintained.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view of a liquid heater in one embodiment of the present invention, FIG. 2 is a side sectional view of a liquid heater in another embodiment, and FIG. 3 is a side sectional view of a liquid heater used in the liquid heater in FIG. 1. 4 is a side sectional view of the heating element; FIG. 5 is a side view of the heating element used in the liquid heater in FIG. 2; FIG. 6 is a side sectional view of the heating element; FIG. 7 is a partially cutaway front view of the heat generating body. 10...Heating plate, 15...Heating element, 16...
Container, 19... Opening part, 20... Packing.

Claims (1)

[Claims] 1. A heat generating plate formed by wrapping a heating wire around an insulating substrate is arranged between a heat transfer member and a back member each having a flange on the outer periphery, and a heat generating plate is placed on the back member side of the heat generating plate. a heat diffusion plate formed of a metal plate with good thermal conductivity and having a peripheral edge in contact with the heat transfer member and the back member, respectively, and further joining the flange of the heat transfer member and the back member. At the same time, the bottom surface of the heat transfer member and the central protrusion of the back member are joined together to form a heating element, and this heating element is attached to an opening provided at the bottom of the container via packing. Heater.