JPH0233086Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a water heater that boils water by placing a heater with a U-shaped bent part inside the tank. This is intended to prevent electrical disconnection or melting of the heater by cutting off power to the heater.

Hereinafter, one embodiment of the present invention will be described in Figures 1 to 4.
To explain with reference to the drawings, numeral 1 denotes a case forming an outer shell, in which support plates 3 fixed to a tank 2 are fixed at constant intervals. Reference numeral 4 denotes a flange, and a recess 6 into which a reinforcing plate 5 is fitted is formed on the outer periphery. Numeral 7 is a screw fixed to the tank 2, and the flange 4 and reinforcing plate 5 are overlapped with each other via a packing 8, and screwed onto this screw 7 with a nut 9, thereby fixing the tank 2 and the flange 4 in a watertight manner. 10 is a hot water pipe, 1
1 is a water supply pipe whose top surface is closed and a water supply port 12 is provided on the side; 13 is a thermo storage pipe whose top surface is watertightly closed; 1
4 is a heater formed with a U-shaped bent portion 15;
The heater 14, the hot water supply pipe 10, the water supply pipe 11, and the thermo storage pipe 13 are each fixed to the flange 4 in a watertight manner by brazing or the like. Further, the U-shaped bent portion 15 of the heater 14 is in contact with the inner surface of the flange 4, and this portion is also fixed by brazing or the like. 16 is the U-shaped bent portion 1
5, which is attached to the outer surface of the flange 4 by a mounting plate 19, and the mounting plate 19 is attached to the nut 1 using one of the screws 7 of the tank 2.
It is screwed by 7. Reference numeral 20 denotes a liquid expansion variable temperature regulator that also serves as a switch, installed at the bottom of the case 1, and a temperature sensing tube 21 is inserted into the thermo storage tube 13. 22 is a knob for operating this temperature regulator. Reference numeral 23 denotes a mounting base for fixing the power terminal 24, which is fixed to the case 1. 25
is a supporting metal fitting that supports and fixes the hot water supply pipe 10 and the water supply pipe 11, and is fixed to the mounting base 23, and serves to position and reinforce the hot water supply pipe 10 and the water supply pipe 11.
26 is a heat insulating material such as glass wool, which covers the tank 2 so that the boiling water does not cool down.

The present invention has the above-mentioned configuration. First, when the water supply pot (not shown) is opened and water is supplied, the water flows through the water supply pipe 11 as shown by the arrow in Fig. 3.
The water is supplied to the tank 2 from the water supply port 12. When water comes out from the hot water pipe 10, the tank 2 is full of water, so the water supply pot is closed to stop the water supply.
Next, when the knob 22 of the overtemperature rise preventer 20, which also serves as a switch, is operated to energize the heater 14, the water in the tank 2 is heated by the heat generated by the heater 14. At this time, if the knob 22 is set to the highest temperature position, the hot water in the tank 2 will be heated to about 85°C by the action of the temperature regulator 20. When using this boiling water, open the water supply pot and supply water to tank 2 as described above, and the hot water in tank 2 will be pushed up by the supplied water.
It is extruded from the hot water supply pipe 10 and used for various purposes.

The present invention is used for the above-mentioned ease of use, but if you accidentally operate the knob 22 without supplying water to the tank 2 and energize the heater 14, the heater 1 will be turned off even in the so-called dry firing state.
A U-shaped bent portion 15 of No. 4 is in contact with the inner surface of the flange 4 and fixed by brazing or the like, and an overtemperature rise preventer 16 is in contact with the outer surface of the flange 4 corresponding to this U-shaped bent portion 15. Since the temperature rise preventer 16 quickly detects the heat generated by the heater 14, the heater 1
Since the power to heater 14 will be cut off,
will not reach an abnormally high temperature, causing the surface to melt or the heater wire to break.

In the conventional type, as shown in Fig. 5, the overtemperature rise preventer 16' was attached to the upper surface of the tank 2' so as to correspond to the heater 14' through an air layer in the tank 2', so that the dry firing condition was not achieved. Heater 1 when
The heat generated by the heater 14' does not easily reach the overtemperature rise preventer 16', and as a result, the surface temperature of the heater 14' becomes abnormally high, causing the surface to melt or the heater wire to break, making it impossible to reuse it. At the same time, the overheating preventer 16' was barely activated to prevent a serious accident such as a fire. or heater 1 to make heater 14' reusable.
In order to design the surface power density of heater 14' to be low so that the surface temperature of heater 14' remains below the melting temperature even during dry firing, it is necessary to increase the length of the heater or increase the diameter of the heater. First, it had the disadvantage of high costs.

However, according to the present invention, as mentioned above, the heater 1
The U-shaped bent portion 15 of No. 4 is brought into contact with the inner surface of the flange 4 and fixed by brazing or the like, and the overtemperature rise preventer 16 is attached to the outer surface of the flange 4 corresponding to this U-shaped bent portion 15. The configuration protects the heater 14 so that it can be reused even during dry firing, and there is no need to increase the length of the heater or increase the diameter of the heater to keep the surface power density particularly low, resulting in lower costs. Further, by fixing the U-shaped bent portion 15 to the inner surface of the flange, it is possible to increase the mounting strength of the heater, which is of great practical value.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing one embodiment of the present invention;
The figure is a sectional view taken along the - line in Fig. 1, Fig. 3 is a - sectional view taken in Fig. 2, Fig. 4 is a perspective view of the heater fixed to the flange, Fig. 5 is an electric circuit diagram, and Fig. 6 is a conventional FIG. 3 is a sectional view of a main part showing an example. In the figure, 2 is a tank, 4 is a flange, 14 is a heater, 15 is a U-shaped bent portion, and 16 is an overtemperature rise preventer.

Claims (1)

[Scope of utility model registration request] In a water heater in which a heater having a U-shaped bent part is fixed to a flange and faces inside the tank,
The U-shaped bent portion of the heater is brought into contact with the inner surface of the flange and fixed by brazing or the like, and
A water heater characterized in that an overtemperature rise preventer is attached to the outer surface of the flange corresponding to this U-shaped bent portion.