JPS5946607B2 - Water heater with boiling detection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a water heater having a boil detection device.

Conventional water heaters with a boiling detection function include a water temperature detection method with a temperature sensor installed at the bottom of the container, or a timer type.
Variations in operation were likely to occur, and satisfactory performance could not be achieved.

In addition, in order to eliminate these drawbacks, there is a type that extracts steam from boiling water in a container, uses a thermoswitch to detect the steam temperature, shuts off the heater, and retains heat with a heat retention circuit. When the temperature of the water rises while keeping it warm, it boils again, and the boiling detection thermo switch operates and shuts off the heater again, repeating boiling and keeping warm. During that time, a large amount of water evaporates. In addition, the contacts operate frequently, which shortens the life of the contacts.

The present invention has been made in order to eliminate the above-mentioned conventional drawbacks in a water heater equipped with a boiling detection device using steam.

In Figures 1 and 2, 1 is a container, 2 is an outer box, and 3 is a container.
is a stopper with a steam passage 4; 5 is a hot water spout formed above the container 1; 6 is an upper lid that covers the top of the stopper 3;
One end is connected to the outer box 2 by a hinge 18 or the like, and the other end is tightly attached to the upper part of the outer box 2 by a stopper 19.

7 is a handle attached to the outside of the outer box 2, 8 is a bottom stand, 9 is a container 1
10 is an auxiliary heater provided at the bottom of the container 1, 11 is a normally closed contact that opens and closes in conjunction with the opening and closing of the top lid 6, and is open when the top lid 6 is closed. There is.

12 is a thermoswitch for controlling the auxiliary heater 10;
3 is a heat insulating material that keeps the container 1 warm.

14 is a steam outlet provided in the upper lid 6, 15 is a steam outlet 1
This is a thermoswitch for steam detection placed close to and facing 4.

16 is a relay, and contacts 17 are opened and closed by an excitation coil.
have.

Each part has a circuit as shown in FIG.

Now, the operation will be explained based on the route in FIG. 3. When water is poured into the container 1 and the power is connected, the main heater 9 and the auxiliary heater 10 are energized and the water temperature rises.

The state is shown in FIG. The solid line in FIG. 4 is a water temperature increase curve, and the dotted line is a temperature increase curve on the upper surface of the case of the steam detection thermoswitch 15.

When the water temperature rises, first the thermoswitch 12 of the auxiliary heater 10 is turned off at around 90°C.

When the water temperature reaches 100°C, steam starts to come out, and the steam detection thermoswitch 15 detects this temperature and turns OFF.

Then, the coil of relay 16 is energized and contacts 17 are opened.

After that, the boiling stops and the water temperature gradually drops, but during this time the sley 16 continues to hold itself and the contacts 17 remain open.

Furthermore, when the discharge of steam from the steam outlet 14 weakens due to a decrease in the water temperature, the temperature of the steam detection thermoswitch 15 also decreases, and its contact closes before the thermoswitch 12 is turned on.

When the water temperature reaches about 89° C., the thermoswitch 12 of the auxiliary heater 10 is turned on, the auxiliary heater 10 is energized, and the water temperature is gradually increased.

When the temperature reaches 90° C., the thermoswitch 12 is turned off again, and this operation is repeated thereafter.

During this time, the contacts 17 remain open and there is no repeated boiling as in the prior art.

If the top cover 6 is opened and cold water is added, the relay 16 will be short-circuited since the contact 11 is closed while the top cover 6 is open.

As a result, current no longer flows through the excitation coil of the relay 16, so the contact 17 is closed.

Since the contact point of the steam detection thermoswitch 15 has returned, everything is in its initial state, and the hot water whose temperature has been lowered by the added cold water is once boiled and kept warm.

As is clear from the above description, the present invention includes a relay,
Due to the systematic operation of the steam detection thermoswitch and the lid interlocking switch, the product boils just once, exerts its sterilization effect, and then reaches the ideal heat retention state, and its practical value is great. It is.

[Brief explanation of the drawing]

FIG. 1 is a front sectional view showing an embodiment of the water heater of the present invention;
Figure 2 is a side sectional view of the upper part, Figure 3 is the electrical circuit diagram,
FIG. 4 is a curve diagram showing the state of increase in water temperature and the state of the temperature of the upper surface of the case of the thermoswitch for steam detection. 1... Container, 2... Outer box, 9...
...Main heater, 10...Auxiliary heater, 11...
... Normally closed contact, 12 ... Thermo switch,
14... Steam outlet, 15. ...Thermoswitch for steam detection, 16...Relay, 17...
···contact.

Claims (1)

[Claims] 1. A heating device that detects the boiling of water, comprises a heating device, a steam outlet at the time of boiling, and a thermoswitch that is provided close to the steam outlet and is activated by the steam temperature, In water heaters with boiling detection devices that enter the heat retention process after the main circuit is cut off, the switch number has a contact point that opens and closes in conjunction with the opening and closing of the lid. A water heater with a boiling detection device characterized by closing the contacts of relays connected in series. .