JPS6336968Y2 - - Google Patents

Description

[Detailed description of the invention] (Technical field) This invention relates to electric water heaters such as so-called jar pots that heat and keep warm water in a container, and in particular boiling type electric water heaters that heat water at a predetermined temperature after boiling the water. It concerns water heaters.

(Prior art) Generally, this type of electric water heater combines a relay with a boiling sensor that detects the boiling of hot water, and the self-holding of the relay operates a heating boiling circuit to heat the hot water and raise the temperature. However, when the boiling detector operates, the self-holding of the relay is released and the heating/boiling circuit is switched to the heat retention circuit, and the heat retention circuit then operates to keep the hot water at a predetermined temperature. A variety of boiling type electric water heaters have been proposed in the past.

In addition, this type of electric water heater is often required to provide hot water higher than a predetermined temperature (warm temperature), and in order to meet this requirement, conventionally, the relay contacts have been manually operated. Switches were connected in parallel, and by turning on the switch, the relay returned to the self-holding state and the hot water was re-boiled, making it possible to obtain high-temperature hot water. In order to re-boil the water, it was necessary to add a new switch, which was not very desirable in terms of wiring work and cost.

(Purpose) This proposal was made in view of the above points, and is configured so that the relay can be returned to the self-holding state by turning on the relay contact by external operation, eliminating the need for adding a switch as in the past, and eliminating the need for wiring work and This makes it possible to provide products that are good in terms of cost and other factors.

(Example) An example of the present invention shown in the drawings will be described in detail below.

First, in FIG. 1, 1 is an exterior body, 2 is a container for storing hot water, 3 is a heating band consisting of a main heater and an auxiliary heater, which will be described later, and is wrapped around the outer circumference of the lower end of the container 2, and 4 is a container for storing hot water in the container 2. 5 is a lid that opens and closes the upper part of the exterior body 1 and the container 2; 6 is a lid that is formed in the lid 5 and releases the steam generated inside the container 2 to the outside; steam passage for, 7
is a boiling detection switch that is located near the outer end of the steam passage 6 and detects the boiling of hot water based on the steam temperature.
It consists of a thermal reed switch that can directly drive a 100V relay. 8 is bellows 9 and push button 1
The air pump is built in the lid body 5 and consists of 0 etc.
When the push button 10 is pressed, the entire bellows 9 moves downward to cut off the communication between the inside of the container 2 and the steam passage 6, and then the bellows 9 is compressed to forcefully send air into the container 2, and the inside of the container 2 is compressed. The hot water is poured out through the pouring path 4. 11 is a heat retention control switch such as a thermal reed switch that is located on the outer bottom of the container 2 and senses temperature changes in hot water.
Turns ON when the temperature drops below 90℃. 12 is an automatic reboiling switch such as a thermostat that is located on the outer surface of the container 2 and senses changes in the temperature of hot water.
Turns ON when the temperature drops below 80℃. 13 is a relay attached to the outer bottom surface of the container 2 via a mounting angle 14, and as shown in FIG.
a, relay movable iron piece 13b, relay contact 13c that opens and closes in response to the iron piece 13b, and spring 1;
Consists of 3d etc. Reference numeral 15 denotes a support piece extending from the mounting angle 14 and supporting the operating rod 16 so as to be movable in the axial direction.The operating rod 16 has one end attached to the relay movable iron piece 13b as shown in FIG. While facing each other, the other end is inserted into the operation hole 17 of the exterior body 1 and protrudes outward, and is always urged outward by a spring 18. Thus, the operating rod 16, spring 18, etc. constitute a reboiling operating means,
By pushing the operating rod 16 in the direction of the arrow in FIG. 1, the relay movable iron piece 13b is operated and the relay contact 13c is turned ON.

Next, in the electric circuit shown in FIG. 3, 19 is a main heater, 20 is an auxiliary heater, and 21 is an AC 100V power supply, and the main heater 19 is connected in parallel with a series circuit consisting of a boiling detection switch 7 and a relay coil 13a. However, a parallel circuit consisting of a relay contact 13c and an automatic reboiling switch 12 is inserted between these circuit sections and one terminal of the power supply 21. On the other hand, the auxiliary heater 20 is connected in series with the heat retention control switch 11 to form a heat retention circuit, and is connected between both terminals of the power supply 21.

In the above configuration, when water is now stored in the container 2 and the power is turned on, each switch 7, 11, 12
are all in the ON state, so both the main heater 19 and the auxiliary heater 20 are energized and start heating, while
In the relay 13, the relay coil 13a is energized, the relay contact 13c is closed, and the relay 13 enters a self-holding state. Then, as the temperature of the hot water rises,
First, the automatic reboiling switch 12 is turned OFF, then the heat retention control switch 11 is turned OFF, heating by the auxiliary heater 20 is stopped, and thereafter the main heater 19 is turned OFF.
Heating is continued by the chisel. Eventually, the hot water in the container 2 starts to boil and steam is generated, which flows into the steam passage 6.
Boil detection switch 7
senses the steam temperature and turns off, relay contact 1
3c is turned off, the self-holding of the relay 13 is released, heating by the main heater 19 is stopped, and the heating and boiling circuit is switched to the heat retention circuit. From then on, the auxiliary heater 20 is controlled by turning the heat retention control switch 11 ON and OFF, and hot water is heated. to keep it at a specified temperature.

When pouring out the hot water in the container 2, if you want to obtain hot water at a temperature higher than the heat retention temperature, use the operating lever 16.
turns on relay contact 13c. Then, the relay coil 13a is energized and the relay 13 returns to the self-holding state, and the same operation as described above is repeated to boil the hot water again, so that high-temperature hot water, that is, boiling water can be obtained.

Automatic reboiling switch 12 replenishes water in container 2 and turns ON when the temperature drops below 80℃.
It is meant to be re-boiled.

In the above embodiment, since the relay 13 is arranged below the outer bottom surface of the container 2, even if water splashes on the exterior body 1 and enters the interior through the operation hole 17, the relay 13 will not get wet. , also relay 1
3 is located at a position where it is difficult to directly receive the radiant heat of the heating zone 3, which is extremely effective in terms of electrical insulation and thermal protection.

It should be noted that the present invention is not limited to the embodiments described above and shown in the drawings, but can of course be implemented with appropriate modifications within the scope of the gist.

(Effects) As described above, the present invention allows reboiling without adding a new switch, and is extremely advantageous in terms of wiring work and cost.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing the water heater of the present invention, FIG. 2 is a sectional configuration diagram of the main parts of the same, and FIG. 3 is an electric circuit diagram of the same. 2: Container, 7: Boiling detection switch, 11: Heat retention control switch, 13: Relay, 16: Operation rod.

Claims (1)

[Scope of Claim for Utility Model Registration] 1 A heating and boiling circuit is activated by the self-holding of a relay to heat and raise the temperature of hot water, and as the water boils, the self-holding of the relay is released and the heating and boiling circuit is switched to a heat-retaining circuit. An electric water heater according to the invention, further comprising a reboiling operation means for turning on a relay contact of the relay by an external operation to return the relay to a self-holding state. 2. The electric water heater as set forth in claim 1 of the Utility Model Registration Claim, in which a relay is disposed below the outer bottom of a container that accommodates hot water.