JPS627225Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an electric kettle that boils liquid such as water stored in a tank via a heater.

In this type of pot, a band-shaped heater is wrapped around the lower part of the tank, and the heater boils the liquid in the tank. The liquid in the tank is heated by the heater and its temperature rises, but during this process bubbles are generated on the inner peripheral surface of the tank at a portion corresponding to the position where the heater is wound. Conventionally, the inner circumferential surface of the tank is mirror-like, so the bubbles grow large while adhering to the inner circumferential surface of the tank, and then the large bubbles actively rise through the liquid and reach the liquid surface. As it reaches the end, it bursts and makes a popping sound. At this time, since the size of the bubbles is large, the size of the ruptured bubbles is also quite large, and the large bursting sound causes an unpleasant noise to the user.

This idea was developed with this in mind, and its purpose is to prevent the growth of air bubbles by applying fine irregularities to the inner circumferential surface of the tank, at least in the area corresponding to the heater. The purpose is to provide an electric kettle that can boil water quietly and efficiently.

An embodiment of this invention will be described below with reference to the drawings. 1 in the figure is a cylindrical case molded from synthetic resin, and the upper end of this case 1 has an inner lid 2.
However, a bottom cover 3 is attached to each lower end. A replenishment port 2a is formed in the inner lid 2, and an opening/closing plug 5 is removably fitted into the replenishment port 2a via a packing 4. A holding plate 7 is provided horizontally on the inner bottom of the case 1 via a pair of supporting leg pieces 6, 6, and a tank 8 formed in a cylindrical shape with a bottom is mounted and held on the upper surface of this holding plate 7. There is. A flange 9 having an arcuate cross section is integrally formed on the periphery of the upper opening of the tank 8, and this flange 9 connects to the inner lid 2.
Packing 1 in the groove 10 formed around the lower surface of the
They are airtightly fitted via 0a, and are pressed and held by a pushing member 12. Further, a flat band-shaped heater 13 is wound around the outer peripheral surface of the lower end of the tank 8, and this heater 13 is electrically connected to a plug receiver 14 via a thermostat 13a. A fine unevenness treatment 11 is applied to the inner peripheral surface of the tank 8 at a portion corresponding to the heater 13 by, for example, sandblasting or chemical etching.

On the upper surface side of the inner lid 2, an outer lid 16 which is hemispherical and has a recess 15 at its top is rotatably provided via a pin 16a. The outer cover 16 and the inner cover 2 each have a protrusion 1 that protrudes laterally.
7 and 18 are integrally formed, overlap each other, and are locked via an externally operable hook 19. A supply passage 20 is formed on the upper surface of one of the protrusions 18 , a conduit 21 is connected to the base end of this supply passage 20 , and the lower end of this conduit 21 faces the inner bottom of the tank 8 . Further, the distal end side of the supply path 20 is open to the outside via the supply port 22.

An air pump mechanism 23 is incorporated inside the outer lid 16. That is, a substrate 24 is provided horizontally on the lower surface of the outer lid 16, and a bellows 25 is attached to the upper surface of this substrate 24. This bellows 2
5 has a movable plate 26 at the upper end, and this movable plate 26 is connected to a spring 27 disposed inside the bellows 25.
is urged upward by. Recess 1 of outer lid 16
A push body 28 is loosely fitted in the interior of the recess 15 so as to be movable up and down, and interlocking pieces 29, 29 are integrally formed on both sides of the push body 28. The movable plate 26 faces the periphery of the movable plate 26 through through holes 31, 31 formed in the movable plate 26.
An introduction hole 32 is formed in the center of the movable plate 26,
An annular packing 33 is formed on the inner peripheral edge of this introduction hole 32.
is fitted. A cylinder 34 is slidably inserted into the bottom plate 30 of the recess 15, one end of which is fixed to the inner surface of the pusher 28 via a screw 35, and the other end has an abutment plate 36. This contact plate 36 faces the introduction hole 32 . A spring 37 having a smaller spring coefficient than the above-mentioned spring 27 disposed inside the bellows 25 is provided between the abutting plate 36 and the movable plate 26, and the elastic force of this spring 37 causes the abutting plate 36 to The pushing body 28 is integrally urged upward, and a small gap 38 is secured between the contact plate 36 and the introduction hole 32.

An annular projecting wall 40 is integrally provided on the upper surface of the opening/closing stopper 5. A packing 41 is attached to the projecting wall 40, and the base plate 2 of the outer lid 16 is attached to the packing 41.
4 are in contact with each other in an airtight manner so as to be able to freely approach and separate. On the inner side of the projecting wall 40, through holes 42 and 43 are formed in the base plate 24 and the stopcock 5, respectively.

The liquid L contained in the tank 8 is heated by the heater 13 to raise its temperature, and the temperature is kept constant by intermittent energization by the thermostat 13a. When the pushing body 28 is pressed downward in this state, the contact plate 36 first contacts the packing 33, the introduction hole 32 is hermetically closed, and then the movable plate 26 is pressed downward, and the bellows 25 is moved inside. It is compressed together with the air, and the compressed air enters the through hole 4.
2, 43 and is discharged into the tank 8. This discharge pressurizes the liquid surface of the liquid L, and accordingly, the high temperature liquid L is discharged to the outside through the conduit 21, the supply path 20, and the supply port 22. After that, when the pressing of the pushing body 28 is released, the contact plate 36 is separated from the packing 33 together with the pushing body 28 due to the elastic force of the spring 37, and external air flows into the bellows 25 from the gap 38 through the introduction hole 32. Accordingly, the bellows 25 returns to its original state due to the elastic force of the spring 27.

When the liquid L in the tank 8 is heated by the heater 13 to raise its temperature, bubbles are generated on the inner peripheral surface of the tank 8 in a portion corresponding to the heater 13.
However, this part has been subjected to a fine unevenness treatment 11, which makes it difficult for the bubbles to remain in that part, and therefore, before they grow large, they rise in the liquid L in a fine state. It reaches the liquid level and ruptures. In this way, the bubbles burst in a fine state, so the bursting sound is small, and therefore, the noise can be suppressed and water can be boiled quietly.

In the above embodiment, the fine unevenness treatment was applied only to the portion corresponding to the heater, but the same unevenness treatment may be applied to the entire inner circumferential surface of the tank.

As explained above, according to this invention, at least the portion of the inner peripheral surface of the tank that corresponds to the heater is treated with fine irregularities, which has the effect of suppressing the growth of bubbles and allowing quiet boiling of water. It is something to play.

[Brief explanation of the drawing]

The figure is a sectional view showing an embodiment of this invention. 8...Tank, 11...Irregularity treatment, 13...Heater.

Claims (1)

[Scope of utility model registration request] A band-shaped heater is wrapped around the outer periphery of the tank, and the heater boils the liquid in the tank, characterized in that the inner peripheral surface of the tank at least in a portion corresponding to the heater is treated with fine irregularities. electric pot.