JPS6219135A - Electric pot - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to electric water heaters such as jar pots and electric kettles that boil water and then maintain it in a warm state.

Conventional technology Conventionally, this type of electric water heater is equipped with a stainless steel heavy-structured hot water storage container surrounded by a heat insulating material, extracts steam when the water boils, and measures the steam temperature using a temperature sensor. There is a known device that maintains the water temperature by detecting it, shutting off the main heater, and continuously energizing the heat-retaining heater to slow down the rapid drop in water temperature and balance the heat release and heat generation of the hot water at about 90°C. ing.

Problems to be Solved by the Invention According to the above configuration, various problems have arisen due to insufficient heat insulation of the container for storing hot water. In other words.

When the product is used in a cold region, in order to maintain the specified hot water temperature, it requires about 10 to 20 W more heating power than the rated heating power, and when used at the rated heating power, the specified heating power is required. Unable to maintain temperature, power is turned on to the main heater again.
It boiled and kept warm repeatedly. Additionally, when the product is used in high-temperature areas, in order to maintain the specified water temperature, a heating power that is approximately 10W lower than the rated thermal insulation 3P power is required.

When used at the rated heat retention power, it exceeds the predetermined heat retention temperature and enters a weak boiling state. Containers used to store hot water and water with poor insulation properties are not only unable to maintain the specified heat retention temperature because they are constantly affected by the ambient temperature, but in some cases, the lids and steam passages of the product can reach temperatures that far exceed the ratings. due to exposure to vapors.

The deterioration of plastic parts has been accelerated, resulting in various types of defects and shortening the product life. Additionally, for products equipped with an air pump, the amount of steam generated during heat retention is much greater, and the steam enters the bellows of the air pump and becomes water droplets.

It was not sanitary because it died and turned into water and rotted. Furthermore, a large amount of steam reduces the amount of water when keeping warm.

There were a variety of problems, including decreased reliability of electrical components and increased indoor humidity. In addition, a heat-retaining power of about 60 to 40 W was required for a product with a capacity of 2.2 tons, so it could not be said to be a power-saving product.

Means for Solving the Problems The present invention improves the drawbacks of the above-mentioned conventional techniques.
By making the hot water storage container a container with a vacuum insulation layer, after the hot water in the container is boiled, the heat retention heater is automatically energized continuously to maintain the warm state, and with a small amount of heating power, it can maintain the temperature at two ambient temperatures. It always maintains stable heat retention regardless of the temperature.

In addition, if the temperature of the hot water drops due to replenishment of cold water, the main heater will automatically boil the water and then keep it warm with the insulation heater.If you operate the reboil switch while the insulation heater is turned on, the hot water will be forced to a boil. After that, keep it warm.
Furthermore, it is an object of the present invention to provide a device that can maintain a water temperature that is sufficiently satisfactory for practical use even when no electricity is applied.

Function With the above configuration, once the hot water in the container is boiled, the heat retention heater is automatically energized continuously to maintain the heat retention state, and with a small amount of heat retention power, it is not affected by the ambient temperature or water volume. It maintains a high temperature, and if the temperature drops due to replenishment of cold water, it is automatically brought to a boil with the main heater, and then kept warm with a heat-retaining heater.

P Furthermore, even when no electricity is applied, it is possible to maintain a water temperature that is sufficiently satisfactory for practical use. Moreover, the boiling state can be freely brought to a boiling state at any time by operating the reboiling switch from the warm state.

Example An embodiment of the present invention will be described below with reference to the drawings.

The configuration of the embodiment is as shown in FIGS. 1 and 2.

1 is a vacuum insulation layer, 2 is a container for storing hot water and water that has a vacuum insulation layer 1, 3 is an approximately 800W main heater for boiling water, 4 is an approximately 8W insulating heater for heating and keeping hot water, and 5 is a replenishment of cold water. A second temperature detector consists of a hot water boiling thermoswitch that detects when the water temperature drops below a predetermined temperature due to such reasons, 6 is a hot water boiling thermoswitch that detects when the heater is completely burnt out, 7 is a temperature fuse, and 8 is a hot water boiling thermoswitch. A first temperature detector consisting of a steam thermoswitch detects the steam in the hot water storage container 2 when the water boils; 9 is a relay that switches between heating by the main heater 3 and heating by the heat-retaining heater 4; 10 is the heat-retaining heater 4; Switches from heating by P to heating by main heater 6. This is a normally open reboiling switch that is turned ON only when suppressed. Reference numeral 11 denotes a relay coil of the relay 9, which is connected in series to the first temperature detector 8.

Reference numeral 12 denotes a relay contact of the relay 9, which is connected in parallel to the second temperature detector 5. 13 is an AC power source.

The operation of this embodiment having the above configuration will be explained based on the circuit shown in FIG.

When you put a tree in the hot water storage container 2 and turn on the electricity.

Since the second temperature detector 5 and the first temperature detector 8 are closed, the AC power supply 16 is applied to the main heater 3, and the main heater 3 generates heat, and the water temperature begins to rise.

At the same time, relay coil 11 is energized, so relay contact 1
2 is closed. As the water temperature gradually rises, first, the second temperature detector 5, which is a water boiling thermoswitch, turns off at around 90°C. When the water temperature reaches 100° C., the hot water heated at about 800 W suddenly begins to emit a large amount of high-temperature steam, and the first temperature detector 8, which is a steam thermoswitch, detects this temperature and turns OFF. In Figure 3, the water temperature is shown by a solid line at 7P, and the steam temperature is shown by a dotted line. Then relay coil 11
Since the current is stopped, the relay contact 12 turns OFF,
Since the main heater filter and the heat retention heater 4 are connected in series, the heat retention heater 4 is mainly
The water is heated by The heating power at this time is approximately 8W
Since the container 2 for storing hot water and water has a vacuum insulation layer 1, it has an extremely good heat retention ability, and an approximately 8W insulating heater 4 can generate an amount of heat equivalent to the amount of heat radiated from an electric water heater at a water temperature of 95°C. 2. It is possible to maintain a constant temperature of hot water at all times, regardless of the ambient temperature. On the other hand, the high temperature and large amount of steam generated by the main heater B of about 800 W disappears because the main heater B is kept warm, and the temperature of the first temperature sensor 8 decreases and is turned ON again. However, since the second temperature detector 5 remains OFF, a current sufficient to turn on the relay contact 12-k does not flow, and the temperature-retaining state is maintained from then on. What if now?

When cold water is added due to the use of hot water, the temperature of the hot water drops.

When the temperature drops below 85°C, the second temperature sensor 5 turns on, and since the first temperature sensor 8 is already turned on, it returns to the initial state, and after boiling the water with the main heater 6, the temperature is kept warm. Do the following. Furthermore, the container 2 is formed from the vacuum insulation layer 1.

Even if there is no AC power supply, once boiled water costs 4
The water temperature can be maintained at a temperature of 90°C or higher. In addition, when boiling water after using it for a long time without AC power supply 16, by turning on the reboiling switch 1l, the relay coil 11 is energized and the relay contact 12 is turned on even when the second temperature detector 5 is OFF. is turned ON and self-maintained, so even when the reboiling switch 10 is turned OFF, the main heater filter is energized through the relay contact 12'fr, and the water is kept warm after being boiled.

Effects of the Invention According to the present invention, there is provided a container having a vacuum insulation layer with excellent heat retention ability, a main heater, a heat retention heater, a first temperature detector for detecting steam temperature, and detecting a drop in water temperature. and a second temperature sensor.

Equipped with a reboiling switch, once the hot water in the container has been brought to a boil, it will be affected by the ambient temperature and will not generate a large amount of steam when keeping warm.

Stable heat retention can be achieved. Moreover, the heating power is about 1/4 of the conventional heating power.

Furthermore, even when no electricity is applied, the electric water heater can maintain the same temperature as a conventional boiling type jar pot for 4 hours, making it an extremely efficient and economical electric water heater.

[Brief explanation of the drawing]

Fig. 1 is a side sectional view of an electric water heater showing an embodiment of the present invention, Fig. 2 is an electric circuit diagram thereof, and Fig. 3 is a diagram showing the correlation between water temperature, steam thermoswitch temperature, and heater power. . 1... Vacuum insulation layer, 2... Container. 6... Main heater, 4... Heat retention heater. 5... Second temperature detector, 8... First temperature detector. 10...Reboil switch.

Claims (1)

[Claims] Providing a container (2) having a vacuum insulation layer (1),
A main heater (3) for boiling water, a heat retention heater (4) for maintaining a low boiling state, a first temperature detector (8) for detecting boiling of water, and a temperature sensor for detecting water temperature below a predetermined temperature. The second temperature detector (5) and the first temperature detector (8) detect the heating boiling state by the main heater (3). death,
While keeping warm with both heaters (3) and (4),
When the water temperature drops below a predetermined temperature, the second temperature detector (5) detects this and the main heater (3) is used only to bring the water to a boiling state. An electric water heater characterized by being equipped with a reboiling switch (10) that switches to a boiling state by energizing.