JPH058005B2 - - Google Patents

Description

[Detailed description of the invention] [Technical field of invention] This invention relates to improvements in boiling electric kettles.

[Technical Background of the Invention] Conventionally, a boiling type electric pot having a circuit configuration shown in FIG. 4 is known. This connects a series circuit of a thermoswitch 4 for temperature control and a heating element 5 for boiling water to an AC power supply 1 via a temperature fuse 2 and a heating prevention limiter 3, and also connects a thermal switch 6 for heat retention control and a heating element for heat retention. A series circuit with 7 is connected. A relay 9 is connected in parallel to the heating element 5 for boiling water via a boiling thermoswitch 8, and a boiling display circuit 10 is connected in parallel. Normally open contact 9a
and a heat retention display circuit 12 are connected in parallel.

In this device, the temperature control thermo switch 4, the boiling thermo switch 8, and the heat retention control thermal switch 6 are all turned on at first.
When the power source 1 is turned on, electricity is started to be applied to the heating element 5 for boiling water and the heating element 7 for keeping warm, thereby heating the water in the container. Also, the relay 9 operates and its normally open contact 9
Turn on a. When the water temperature in the container reaches about 90°C, the temperature control thermoswitch 4 is turned off. However, since the normally open contact 9a of the relay 9 is on at this time, the power supply to the heating element 5 for boiling water continues thereafter. 100℃ where the water in the container boils
When the boiling temperature is reached, the boiling thermoswitch 8 is turned off and the operation of the relay 9 is stopped. In this way, the normally open contact 9a of the relay 9 is turned off, and the power supply to the heating element 5 for boiling water is stopped.From now on, the power supply to the heating element 7 for keeping warm is controlled by the on/off operation of the thermal switch 6 for keeping warm. The temperature is kept warm. In order to re-boil the hot water that has been kept warm, the re-boiling switch 11 can be turned on.

[Problems with the Background Art] However, since such a device uses a relay and a thermoswitch for temperature control, it has the disadvantage that the configuration is complicated and the cost is high.

[Object of the Invention] The present invention was devised to eliminate such drawbacks, and an object thereof is to provide a boiling type electric pot that can simplify the circuit configuration and reduce costs.

[Summary of the Invention] The present invention provides a steam release path, heats water contained in a container with a heating element for boiling water, and then performs a heating operation using a heating element for keeping the water warm. In boiling type electric pots,
An automatic return type thermoswitch for boiling detection and a manual return type thermoswitch for reboiling are installed, which operate by detecting the steam temperature in the steam release path, and a heating element for boiling water is connected to the power supply through a parallel circuit of each thermoswitch. Then, the return temperature of the automatic reset type thermoswitch is set lower than the temperature in the steam release passage when the heating element is used to keep the temperature warm. The temperature is set higher than the temperature inside the steam escape passage.

[Embodiments of the Invention] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows the overall structure. Reference numeral 21 denotes a cylindrical case, and an end plate 22 is attached to the upper opening of the case 21. FIG. A cylindrical container 23 with a bottom is housed inside the case 21, and the upper opening periphery of the container 23 is supported in close contact with the end plate 22. A water inlet 24 is formed in the end plate 22, and an inner plug 26 is removably attached to the water inlet 24 via an inner plug packing 25.
By removing this inner plug 26, the water inlet 2
Water can be poured into the container 23 from 4. A heating element 27 for boiling water and a heating element 28 for keeping warm are provided on the outer periphery of the lower end of the container 23.

A steam escape passage 29 is formed inside the inner stopper 26 . Steam from the container 23 escapes to the outside from an outlet 31 via a flow path 30 provided in the center of the inner stopper 26 and the steam escape path 29. An inverted bowl-shaped upper lid 32 is provided on the upper surface side of the inner stopper 26, and one end of the upper lid 32 is connected to the end plate 22 through a hinge pin 33.
It is rotatably supported. A base plate 34 is provided on the lower surface of the upper lid 32, a movable plate 35 is provided above the base plate 34, and a telescopic bellows 36 is provided between the movable plate 35 and the base plate 34. A circular recess 37 is formed at the upper end of the upper lid 32, and a cylindrical pusher body 38 with an inverted bottom is fitted into the recess 37 so as to be vertically movable. A sliding hole 39 is formed in the center of the bottom surface of the recess 37, and a cylindrical closing body 40 is slidably inserted into the sliding hole 39. This closing body 40 has an upper end fixed to the inner top surface of the pushing body 38 via a screw 41, and a lower end having a closing part 42 projecting like a brim from its outer periphery.

A through hole 43 is formed in the center of the movable plate 35, a flat annular packing 43a is attached to the inner peripheral edge of the through hole 43, and the closing portion 42 faces the packing 43a at a distance. A rod-shaped opening/closing body 44 is inserted into the through hole 43 through a gap, and the lower end of this opening/closing body 44 slidably penetrates the substrate 34, and the tip of the opening/closing body 44 has a circular shape covered with packing 45. An opening/closing plate 46 is attached.

The upper end of the opening/closing body 44 faces into the closing body 40,
A first spring 47 is provided between the upper end surface of the opening/closing body 44 and the inner top surface of the closing body 40, and a second spring 48 is further provided within the bellows 36.
The second spring 48 elastically biases the movable plate 35 upward, and the biasing force causes the movable plate 35 to
A protrusion 4 whose upper surface protrudes from the lower surface of the bottom of the recess 37
It is in contact with 9. On the other end sides of the end plate 22 and the upper lid 32, protrusions 50 and 51 overlap each other so as to be able to approach and separate, and communicate between the bottom of the container 23 and the pouring spout 52 inside the protrusion 50 of the end plate 22. A hot water supply path 53 is formed.

An automatic return type thermoswitch 55 is buried on the outlet 31 side of the steam escape passage 29, and a manual return type thermoswitch 56 is buried on the opposite side. That is, the manual return type thermoswitch 56 is provided on the outlet side where the pouring port 52 is located, and is reset by pressing an operation button 57 provided to protrude to the outside.

An empty cooking prevention limiter 5 is provided on the side of the container 23.
8 is attached to the bottom of the container 23, and a thermal switch 59 for heat retention control is attached to the bottom of the container 23.

FIG. 2 is a diagram showing the circuit configuration, including an AC power source 61, a temperature fuse 62, and the dry cooking prevention limiter 5.
8, a series circuit between the automatic return type thermoswitch 55 and the heating element 27 for boiling water, as well as the thermal switch 59 for heat retention control and the heating element 28 for heating the water.
A series circuit with is connected. A boiling water boiler display circuit 63 is connected in parallel to the water heater heating element 27, and the manual return thermoswitch 56 and the heat retention display circuit 64 are connected in parallel to the automatic return thermoswitch 55, respectively. The return temperature T ₁ °C of the automatic return type thermoswitch 55 is the return temperature of the manual return type thermoswitch 56.
It is set lower than T ₂ ℃.

In the embodiment of the present invention having such a configuration, water can be supplied into the container 23 by opening the top cover 32 and removing the inner stopper 26. When water is poured into the container 23 and the power source 61 is turned on, the thermoswitches 55 and 56 are both in the on state at this point, so energization to the heating element 27 for boiling water is started. Furthermore, since the thermal switch 59 is also turned on, electricity starts to be supplied to the heat generating element 28 for heat retention. Therefore, the water temperature in the container 23 increases over time as shown by the solid line graph in FIG. When the water temperature reaches about 96° C., the thermal switch 59 is turned off, and the electricity to the heat-retaining heating element 28 is stopped. However, electricity continues to be supplied to the heating element 27 for boiling water. When the water temperature reaches 100° C., it begins to boil, and steam escapes through the flow path 30 to the steam escape path 29 and further to the outside through the outlet 31. The steam discharged to the steam relief path 29 comes to hit an automatic return type thermoswitch 55 and a manual return type thermoswitch 56. As a result, the detected temperatures of both thermoswitches 55 and 56 rise rapidly, as shown by the dotted line graph in FIG.
Eventually, both thermoswitches 55 and 56 come to turn off. As a result, the heating element 2 for boiling water
7 is stopped, and thereafter the heat-retaining heating element 28 is energized and de-energized by turning on and off the heat-retaining control thermal switch 59, and the water temperature in the container 23 is kept at about 96°C. Ru. In the heat retention state, the generation of steam decreases, so the temperature detected by both thermoswitches 55 and 56 decreases to T° C. shown by the dashed line in FIG. Therefore, if the return temperature T ₁ °C of the automatic return type thermoswitch 55 is set lower than T °C, the boiling operation will not be repeated during heat retention, and stable heat retention operation can be achieved. Further, if the resettable temperature T ₂ °C of the manual reset type thermoswitch 56 is set higher than the temperature T °C, the reboiling operation can be performed by pressing the operation button 57 at any time during heat retention. Furthermore, when adding water to the container 23, the top cover 32 is opened, which causes the automatic return type thermoswitch 55 to be activated.
will cool down and return automatically. Therefore, container 2
The water in 3 will be boiled again.

In this way, only by providing the automatic return type thermoswitch 55 and the manual return type thermoswitch 56, boiling operation, re-boiling operation by external operation, and boiling operation after adding water can be performed. Therefore, for example, if the automatic return thermoswitch 55 is made to correspond to a boiling thermoswitch, and the manual return thermoswitch 56 is made to correspond to a reboil switch, the conventional relays and temperature control thermoswitches are no longer necessary. This makes it possible to simplify the configuration and reduce costs. Further, since the operation button 57 is provided on the hot water outlet side, the reboiling operation is easy.

[Effects of the Invention] As described in detail above, according to the present invention, it is possible to provide a boiling type electric pot that can simplify the circuit configuration and reduce costs.

[Brief explanation of the drawing]

1 to 3 show embodiments of the present invention, with FIG. 1 being a partial sectional view showing the overall structure, and FIG.
The figure is a circuit configuration diagram, FIG. 3 is a graph showing changes in water temperature and temperature changes detected by a thermoswitch, and FIG. 4 is a circuit configuration diagram showing a conventional example. 23... Container, 27... Heating element for boiling water, 29
...Steam release path, 55...Automatic return type thermoswitch, 56...Manual return type thermoswitch.

Claims (1)

[Scope of Claims] 1. A boiling method in which a steam escape path is provided, water contained in a container is heated by a heating element for boiling water, and then a heating element is used to keep the water warm. In the type electric pot, an automatic return type thermoswitch for boiling detection which turns off by detecting the steam temperature in the steam relief passage, and a manual return type thermoswitch for reboiling which also turns off by detecting the steam temperature in the steam relief passage. A type thermoswitch is provided, and the heating element for water boiling is connected to the power supply through a parallel circuit of each of the thermoswitches, and the temperature at which the automatic return type thermoswitch returns to the on state is set to the temperature at which the thermoswitch is returned to the on state when the heating element for heat retention operates to keep the water warm. The temperature at which the manual return type thermoswitch returns to the ON state is set lower than the temperature in the steam relief path during the heat retention operation by the heat retention heating element. A boiling type electric kettle characterized by: 2. The boiling type electric kettle according to claim 1, characterized in that a manual return type thermoswitch is provided on the hot water outlet side.