JP2503598Y2 - Electric pot - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Use) The present invention relates to an electric pot for heating water stored in a tank by a heating element.

(Prior Art) Generally, it is said that it is better to use hot water that has been boiled once for tea and the like, and JP-A-59-118120 discloses that the bottom of a tank for storing water can supply such hot water. Discloses an electric pot provided with a heating element, and Japanese Utility Model Laid-Open No. 59-101930 discloses an electric pot provided with a heating element below the outer peripheral surface of a tank.

(Problems to be Solved by the Invention) In the above-mentioned conventional technology, the heating element heats the water in the tank to boil the hot water. However, in order to shorten the boiling time, the power consumption of the heating element is increased. In this case, it is conceivable to increase the power consumption (watt density) per unit area of the heating element or increase the heat transfer area of the heating element.

However, increasing the watt density causes the life of the heating element to be shortened, and increasing the heat transfer area of the heat generating element reduces the heat transfer area because the position suitable for mounting the heat generating element is limited. I can't make it big. That is, when the heating element is provided on the bottom surface of the tank, its low area is limited, while the mounting position is also limited when the heating element is provided on the lower portion of the outer peripheral surface of the container.

On the other hand, in Japanese Utility Model Laid-Open No. 54-33262, heating elements are provided on the bottom surface and the outer peripheral surface of the tank, respectively, and according to the water level in the tank,
An electric water heater has been disclosed that can reduce the watt density even with high power consumption by switching the energization of these heating elements. However, when the water in the tank reaches the set temperature during heating in the high water level state, this electric water heater stops the operation of one of the heating elements in the middle, and in the subsequent heating, the inside of the tank Since the water is kept warm without boiling, the water in the tank cannot be boiled in a short time.

An object of the present invention is to provide an electric pot that solves the above problems and provides a heating element that consumes a large amount of power without shortening the life of the heating element to boil and shorten the time until boiling. To do.

[Configuration of the Invention] (Means for Solving the Problem) The present invention provides the first and second heating elements on the bottom surface and the outer peripheral surface of a bottomed cylindrical tank for storing water, and The water level sensor of the tank is installed at almost the same height as the heating element,
Further, based on the output of the water level sensor, a control device is provided which operates the first and second heating elements until it boils in the high water level state, and operates only the first heating element in the low water level state.

(Operation) With the above configuration, when the tank is at a high water level,
The water is heated by the first and second heating elements until it boils, and when the tank is at a low water level, it can be heated by only the first heating element for boiling water.

(Embodiment) A first embodiment of the present invention will be described below with reference to FIGS. 1 to 3.

As shown in FIG. 1, a support ring 2 is attached to the upper end opening of a cylindrical outer case 1, and a bottom lid 3 is attached to the lower end opening thereof. Inside the outer case 1, a bottomed cylindrical tank 4 is installed. It is stored. A flat plate-shaped first heating element 6 is provided on the lower surface of the bottom surface 5 of the tank 4. The first heating element 6 is fitted into the convex portion 7 formed on the bottom surface 5, and the lower surface of the first heating element 6 is pressed by the holding member 8 spot-welded to the lower periphery of the bottom surface 5. Has been. Further, the stopper plate 9 fixed to the center of the convex portion 7 is screwed.
The first heating element 6 is fixed by the pressing plate 11 fixed via 10 pressing the pressing plate 8. A flat second heating element 13 is provided at the lower end of the outer peripheral surface 12 of the tank 4.
Are attached along the circumferential direction and are fixed by a band method. A hot water temperature sensor 14 is attached to the end of the bottom surface 5 while avoiding the first heating element 6. The surface watt density of the first and second heating elements 6 and 13 is set to 5 W / cm ² or less. For example, the power consumption of the first heating element 6 is 640 W,
The power consumption of the second heating element 13 is 360 W, and the total power consumption is 10
It is set to 00W.

A lid 15 provided above the tank 4 so as to be openable and closable has an inverted bowl shape, and one end thereof is rotatably supported via a pin 17 of a hinge portion 16. A substrate 18 is provided on the lower surface of the lid body 15, and a movable plate 19 is provided above the substrate 18, and an expandable bellows 20 forming an air pump is provided between the movable plate 19 and the substrate 18. Is provided. Further, a recess 21 is formed at the upper end of the lid body 15, and an inverted bottomed cylindrical push body 22 as an operation member is fitted in the recess 21 so as to be vertically movable. A bottom plate 23 is fixed below the substrate 18, and a vapor escape passage 24 communicating with the outside is formed in the bottom plate 23. An inflow port 25 of the vapor escape passage 24 is connected to a tank 4 via a communication passage 26. It communicates with the inside. A vapor sensor 27 mounted on the support ring 2 is provided in the middle of the vapor escape passage 24.

Further, a hot water supply passage 28 having one end (not shown) opened is provided on the bottom surface 5 of the tank 4, and the other end of the hot water supply passage 28 communicates with a spout 29 projecting to the upper side on the other side of the outer case 1. are doing. Further, a transparent water level pipe 30 having an upper end (not shown) and a lower end 30A connected to the upper and lower parts of the tank 4 and communicating with the inside of the tank 4 is vertically installed through a rubber joint 31 in the tank 4. A water level sensor 32 for detecting the water level in the tank 4 is provided below the water level tube 30 at substantially the same height as the second heating element 13. The water level sensor 32 is located at substantially the same height as the second heat generating body 13 and a light shielding floater 33 made of an opaque body provided in the water level pipe 30 so as to be vertically movable, and the light shielding floater 33 is located at the same height. The photo sensor 34 detects the light when it is positioned at the position of the photo sensor 34. The photo sensor 34 detects the light transmitted from the lamp 35 through the water level tube 30 by a photoelectric element.
When the light is blocked by the light-blocking floater 33,
A low water level state in the tank 4 is detected.
In addition, 37 is a heating element for heat retention.

FIG. 2 shows a block diagram in which the control device 38 is a CPU3.
9, an input circuit 40 and an output circuit 41 connected to each
And a memory 42, and the hot water temperature sensor 14 and the steam sensor
27 and the water level sensor 32 are connected to the input circuit 40 via the A / D converter 43.
The re-boil switch 4 is connected to the input circuit 40.
4, the heat retention switch 45 and the cancel switch 46 are connected. Further, the output circuit 41 is provided with a lamp for displaying the first heating element 6, the second heating element 13, the heat retaining heating element 37 and the low water level state or a buzzer for informing the low water level state via a drive circuit 47. An alarm device 48 such as is connected.

Next, the operation will be described with reference to the flowchart of FIG.

The water W is stored in advance in the tank 4 in a substantially full state, and when the power plug (not shown) is inserted into an outlet (not shown), the power is turned on (step S1), and at the same time, the water level sensor. Based on 32 outputs (step
S2), the state of high water level H is detected (step S3). By this detection, the first and second heating elements 6 and 13 generate heat to start boiling water (step S4). When the heating state continues for a predetermined time in this way, the hot water temperature sensor 14 detects the hot water temperature (step S5), and when the hot water temperature continues to the preset normal temperature rise change, (Step S
6), the first and second heating elements 6 and 13 continue to boil. On the other hand, if the temperature rises abnormally, the power is cut off (step S7). When the steam boils and steam is generated, the steam passes through the steam escape passage 24 and is detected by the steam sensor 27 (step S8). In this way, the steam sensor 27 reaches the predetermined temperature (step S9) and once the water has boiled, the first and second heating elements 6 and 13 are cut off (step S10), and the heat retaining heating element 37 generates heat. Then, the temperature is maintained at a predetermined temperature (step S11). When the pusher 22 is pressed during hot water supply, the bellows 20 is compressed and compressed air is supplied into the tank 4 through the communication passage 26, so that hot water can be discharged through the hot water supply passage 28 and the spout 29.

On the other hand, the water level in the tank 4 decreases with the hot water supply,
When only a small amount of water W is stored in the tank 4 in advance, the light-blocking floater 33 descends to block the light of the lamp 35. Thereby, the water level sensor 32 detects the state of the low water level L (step S3), and an alarm device such as a water supply lamp or a water supply buzzer.
48 operates (step S12). And reboil switch 4
When 4 is turned on (step S13), only the first heating element 6 is heated by the control device 38 (step S14), and then the process returns to step S5 and the water W is re-boiling. Further, when the reboil switch 44 is not turned on within the predetermined time during the alarm in step S12 (step S15), the power is automatically cut off (step S16).

As described above, in the above embodiment, when the high water level sensor 32 detects the high water level state, the first and second heating elements 6 and 13 are operated until the water in the tank 4 boils. It is possible to shorten the time until boiling while having a configuration in which the energization of the second heating elements 6 and 13 is switched.

Further, by providing the first heating element 6 on the bottom surface 5 of the tank 4 and the second heating element 13 on the lower end of the outer peripheral surface 12 of the tank 4, even if the power consumption is about 1000 W, for example, The watt density can be lowered to accommodate an electric kettle that can be boiled in a short time.

Further, the tank 4 is provided with a water level pipe 30, and the water level pipe 30 is provided with a water level sensor 32 at substantially the same height as the second heating element 13. Based on the output of the water level sensor 32, the inside of the tank 4 is In the high water level H state, the first and second
While the heating elements 6 and 13 are heated, the control device 38 is provided so that only the first heating element 6 generates heat when the tank 4 is in the low water level L state based on the output of the water level sensor 32. It is possible to use it without anxiety, because there is no fear that the water level L will be baked in the air.

The present invention is not limited to the above embodiment,
For example, the position of the water level sensor is provided slightly below the second heating element 13 as shown in FIG. 4, and the light shielding floater in the water level tube is provided with a window hole in the outer case so that the outer case can be visually recognized. It is possible to make various modifications such as provision of.

[Advantages of the Invention] The present invention includes a bottomed cylindrical tank for storing water, a first heating element provided on the bottom surface of the tank, and a second heating element provided on the outer peripheral surface of the tank. , The water level sensor of the tank provided at substantially the same height as the second heat generating element, and when the water level sensor is in a high water level state, the first and second heat generating elements are operated until they boil. A control device that operates only the first heating element when the water level is low based on the output of the water level sensor, and a heating element that consumes a large amount of power without shortening the life of the heating element is provided. It is possible to shorten the time until boiling. Further, since the second heating element is automatically switched according to the water level in the tank, it is possible to prevent the second heating element from being burnt.

[Brief description of drawings]

1 to 3 show a first embodiment of the present invention,
FIG. 1 is a vertical sectional view, FIG. 2 is a block diagram, FIG. 3 is a flowchart, and FIG. 4 is a sectional view showing a second embodiment. 4 ... Tank 5 ... Bottom surface 6 ... 1st heating element 12 ... Outer peripheral surface 13 ... 2nd heating element 32 ... Water level sensor 38 ... Control device W ... Water H ... High water level L ... Low water level

Claims (1)

(57) [Scope of utility model registration request] 1. A bottomed cylindrical tank for storing water, a first heating element provided on the bottom surface of the tank, a second heating element provided on the outer peripheral surface of the tank, and a second heating element. The water level sensor of the tank provided at almost the same height as that of the heating element, and when the water level sensor is in a high water level state, the first and second heating elements are operated until they boil, An electric pot characterized by comprising a control device for operating only the first heating element.