JPS6080052A - Electric water heater - Google Patents

Abstract

PURPOSE:To effect 100 deg.C boiling surely without requesting an expensive temperature sensitive element and accompanying the defect of electric power wasting by equipping a timer and the temperature sensitive element for starting the timer. CONSTITUTION:When the hot-water temperature has arrived at 90 deg.C, the temperature sensitive element 4 is put OFF, the condition of a temprature keeping heater 3 is intercepted and when the hot-water temperature increases to 95 deg.C, the temperature sensitive element 10 is put OFF and the switching contact 11 thereof is switched to the side of the timer 9. When the switching operation is effected, the timer 9 begins its operation, the contact 12 is put ON and the conduction of a water heating heater 5 is effected through the contact 12. Then, the timer 9 operates for a time preset by a knob 9A (three minutes in case the amount of water is 1.8l, for example) and stops after boiling the water at 100 deg.C, thereafter, the contact 12 is put OFF and the conduction of the water heating heater 5 is intercepted.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an electric water heater that boils water using an electric heater, and relates to an improvement in an electric circuit that controls the electric heater.

[Prior art]

Conventionally, the electric circuit of an electric water heater was as shown in FIG.

That is, in the figure, (1) is the power supply, (2) is the fuse, (
3) is a heat-retaining heater, and (4) is a temperature sensing element A that controls the energization to the heat-retaining heater (3), with the OFF temperature (t, 'C
) is 90℃.

0111 temperature (t2°C) is set to 85°C. (
5) is a heater for boiling water, (61 is a heater for boiling water (5)
01? 'F temperature (t
3°C) is set to 95°C, and the ON temperature (t4°C) is set to 80°C. Further, (7) is a lamp for indicating that the water is boiling, (8) is a lamp for indicating heat retention, and (7A) and (8A) are lamp resistors.

In addition, each heater (31, <51 is located at the bottom of the water container of the electric water heater, and each temperature sensing element A, B (4H61 is the outer wall of the water container, etc.) that can accurately detect the temperature of the water inside the water container. Further, the lamps +71 to +81 are respectively provided on the outer case so as to be visible from the outside.

Next, the operation of this conventional circuit will be explained. That is, when a voltage is applied to this circuit, electricity is applied to the heat-retaining heater (3) and the water heater (51) to generate heat.
When temperature reaches ℃(t,'C), temperature sensing element A(4) becomes 01PIF.
L. Cut off the electricity to the heat-retaining heater 131. When the water temperature further rises to 95° C. (13° C.), temperature-sensitive confectionery B (61) turns OFF, cutting off electricity to the water heater (5).

In addition, due to natural heat dissipation, water replenishment, etc., the water temperature is 80℃.
(t4℃) and 85℃ (12℃), the temperature sensing element A (4) turns on and the heat-retaining heater (
3) to keep the water temperature at around 85°C to 90'C, and when the water temperature drops below 80'C (t4°C), temperature sensing element B (61 turns ON). The water heater (5) is energized to raise the temperature of the water to 95°C (13°C).The conventional system operates as described above.

However, as mentioned above, the conventional water temperature is 100%.
Because the water does not reach boiling point (°C), it rarely sterilizes the water.

Furthermore, if you use temperature sensing element A (4; or temperature sensing element B (61) whose OFF temperature (t, 'C) or (t,.G) is 100'C, the water temperature can be made to 100 degrees Celsius. Regardless, the reason why the conventional device did not use a temperature sensing element with an OFF temperature of 100° C. is as follows.

That is, OF
If you use a device with an operating temperature of over 100'C, such as 101°C, the temperature-sensitive confectionery will not turn off for a long time and will continue to boil until the water runs out, resulting in a dangerous situation such as dry cooking. Become. For this reason.

When it comes to water heaters, it is necessary to avoid dangerous conditions at all costs.
To set the temperature to 0°C, it is necessary to use a temperature-sensitive element that reliably turns off at 100°C. However, with current production technology,
It is extremely difficult to obtain a temperature-sensitive confectionery that reliably turns off at 100°C, and even if it were obtained, it would be extremely expensive.
(sacrifice boiling), and allow for variations in OFF operating temperature accuracy.

A temperature-sensitive element with an OFF temperature of 90°C or 95°C was used.

Moreover, it goes without saying that if priority is given to boiling at 100° C., the price of the temperature sensing element will be sacrificed.

Furthermore, in order to bring the temperature to 100°C, it is conceivable to use only a timer without using a temperature-sensitive confectionery.

If the water container of the Tsumashimiki water heater is full and the time required for 20°C water to boil to 100°C is 20 minutes, then
Another possible method is to use a timer and set the timer to operate for 20 minutes from the beginning.

However, with this configuration, for example, the initial water temperature is 5°C.
When the water does not reach 100℃ boiling, and the initial water temperature is 30℃
In this case, the boiling time at 100° C. is too long, leading to waste of electricity and disadvantages such as not being able to adequately compensate for the difference in initial water temperature.

[Summary of the invention]

This invention was made to improve the above-mentioned drawbacks, and includes a timer that starts when electricity is turned on and energizes the water heater for a set time, and a predetermined temperature range lower than 100 degrees Celsius (for example, 90 degrees Celsius). ), and when the temperature of the hot water exceeds the predetermined temperature, the water heater is energized, and when the water temperature exceeds the predetermined temperature, the water heater is energized and the timer is energized to start the timer. Until the water temperature is lower than 100°C, electricity is supplied to the water heater through the temperature sensing element, and when the water temperature exceeds the predetermined temperature,
The system is configured so that electricity is supplied through the timer side for a set time to the water heater.

As a result, the operating temperature can be reliably boiled at 100°C without the need for extremely accurate thermosensors, without the use of expensive thermosensors, and without the disadvantage of power wastage. Electric water heaters can be provided.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 2 and 3.

That is, in Fig. 2, (9) is a motor timer installed in parallel with the water heater (5), and when energized once, it starts operating and closes its contact Q3, and when the set time ends, its contact A2 is opened. It is something. The decoy is a temperature sensing element 0. +I
n is a switching contact, which switches the electricity supply to the water heater (5) and the timer (9J).The other configuration of this electric enclosure is the same as that of the conventional one, so a description thereof will be omitted.

Further, in FIG. 3, aS is a water amount detection means provided on the outer case of the electric water heater, so that the amount of water injected into the water container of the electric water heater can be seen from the outside.

A transparent tube (15A) that communicates with the water container and is visible from the outside and has the same liquid level as the water level in the water container, and a scale plate with a cutout in a portion corresponding to the transparent tube (15A). (15B). Also, this scale plate (1
5B), a scale for displaying the actual amount of water (1) in the water container and a scale for setting a timer operation time (described later) (corresponding to Ie) are provided through cutout portions. In this example, when the water in the water container is 0.61, it is heated to 95°C for 1 minute, when it is 1.27, it is heated to 95°C for 2 minutes, and when it is 1.81, it is heated to 95°C for 3 minutes. minutes, 2.4
1: 95°C for 94 minutes, 3j: 95°C
Since the water heater (5) has a capacity that can achieve boiling of 100°C by energizing it for 5 minutes each, the scale corresponding to the timer operation time setting scale handle on the scale plate (15B) indicates that the water volume is 0. .1 at 61 points. Water amount 1.
2. At 21 locations. 3. At a location with a water volume of 1.81. Water amount 2.4
4. at 1 location. The number 5 is given at a point where the amount of water is 3 tons.

In addition, (9A) is the operation time setting knob of the above-mentioned timer (91) with a linear mark formed on the surface of 0 (I).
G is the knob on the outer case of the electric water heater (9A)
It was formed at a location corresponding to the landmark. This is a timer operation time setting scale consisting of numbers 0 to 5, and the numbers 1 to 5 correspond to the numbers 1 to 5 on the scale plate. In this embodiment, the water heater (5) is of the capacity described above, so the scale for setting the timer operation time (number 1 of 1119) is the number 1 and the knob (9A).
), the timer (9) operates for 1 minute [95°C hot water at 0.61°C is heated to the water heater (5)].
It is formed in a position where it can be set for the time it takes to reach 100℃.

In addition, number 2 indicates that when the mark of the knob (9A) is aligned with number 2, the timer 191 will operate for 2 minutes [95
Heat 1.21℃ of hot water to 100℃ using the water heater (5).
The numbers 3 to 5 are also formed at positions where the timer (9) can be set for 3 minutes when the mark on the knob (9A) is aligned with the number 3 to 5. The number 0 is formed at a position where the time can be set for 4 minutes or 5 minutes.Furthermore, the number 0 is set at a position where the operating time of the timer (9) is not set when the mark on the knob (9A) is aligned with that number 0. 〇The timer (9) is formed by the timer (9), considering the variation in accuracy of the temperature sensing element CO1, the scale of numbers 1 to 5 on the scale plate C15B), and the scale for setting the timer operation time (taking into account the reading error of IQ, etc.) For example, if we take a 1 minute margin for each amount of water, 1
For example, when the mark on the knob (9A) matches the number 5 on the scale, the operation may be performed for 6 minutes.

Further, in this embodiment, the OFF temperature [t
5'CI ON temperature t6℃ and temperature sensing element A (4) 0
FII' temperature t, 'C, ON temperature t2°C are each 95
The temperature was set to 180°C, 190°C, and 185°C.

Next, the usage and operation of the electric water heater according to the present invention will be explained. First, put the required amount of water into the water container of the electric water heater, measure the amount of water put in using the water amount detection means A, and turn the knob (9A) according to the amount read. Set the timer (9J (1) 1m operation time. For example, when the water volume is 1.8J, set the number 1 on the scale plate (15B).
Since the scale of ~5 can be read as 3, the mark on the knob (9A) is also set to 3 minutes on the timer operation time setting scale tte, and the timer operation time is set to 3 minutes.

At this time, set the operation time of the timer (91, for example, water 1
．． 8), even if you set it to 4 minutes or 5 minutes.

Boiling at 100°C can be obtained, but when water is 1.81, it boils at 95°C.
100 if you turn on the water heater (5) for 3 minutes from ℃
℃ boiling can be obtained, and considering the power saving effect, it is preferable to set the timer operation time to 3 minutes when the water is 1.81 °C.

Then, when voltage is applied to the electric circuit, the heat retention heater (3
) and the water heater (5), each heater 131 (51) generates heat.The water temperature is 90°C (°t, 'C
), the temperature-sensing element A (4) turns off.* The power to the heat-retaining heater (3) is cut off, and the water temperature reaches 95℃ (1
5℃), the temperature sensing element CQQ turns OFF and its switching contact D (ID) switches to the timer (9) side.When this switching operation is performed, the timer 19'' starts operating and its contact KQ3 turns OFF. ON, water heater (5)
The energization will be performed through the contact EQ3 of the timer (91).The timer +91 will be activated for the time set by the knob (9A) (for example, when the water volume is 1.8 tons).
In this case, the water boils for 3 minutes), stops after boiling the water to 100℃, and turns off the contact E (12) to cut off the electricity to the water heater (5).Other operations: It is the same as the conventional one.

Also, if boiling at 100℃ is not required, you do not need to set the timer (9);
Just set the mark to the scale for setting the timer operation time (IQ number 0), and add water for refreshing.

When you need to raise the temperature of the water by 100°C due to a drop in water temperature due to refilling, etc., you can set the timer appropriately depending on the amount of water.

FIG. 4 shows another embodiment of the present invention, in which the +M thermostat OaC is composed of a switching contact D+lυ, a relay 0, and a thermostat I. The configuration is the same as that of the actual (11) downstream side explained in FIGS. 2 and 3 above, except that it is operated on the downstream side.

and thermocouples) (14 OFF temperature temperature °C, O
Since the N temperature t6°C is 95°C and 80°C, respectively, similarly to the temperature sensing element Cot) of the above embodiment, the same operation as in the above embodiment is performed. Until the hot water temperature reaches 95°C (t5°C), relay 0 is energized and the water heater (5) is energized through switching contact D+lit until the water temperature reaches 95°G.
(15℃), thermostat I turns OFF and cuts off the power to relay a3, and accordingly switching contact D (
Switch lυ to the timer (9) side and use that timer (9)
Perform the action to start the.

In each of the above embodiments, the operation time of Tie-R-(91) was set manually, but it could also be set automatically using a sensor such as a water level detection sensor or a weight sensor as the water amount detection means α9. In addition to being able to detect the amount of water, this water level detection sensor.

A timer (9) using the output of a sensor such as a weight sensor
) The timer operating time may be automatically set according to the amount of water.

(Effects of the Invention) As described above, according to the present invention, there is a timer that starts when electricity is turned on and energizes the water heater for a set period of time, and a timer that starts the water heater when the water is turned on and energizes the water heater for a set time. The device is equipped with a temperature-sensitive element that energizes the water heater and, when the water temperature exceeds the predetermined temperature, cuts off the energization to the water heater and energizes the timer to start the timer. It is possible to provide an electric water heater that can actually boil water at 100° C. without requiring an expensive temperature sensing element and without having the disadvantage of wasting power.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the electric circuit of a conventional electric water heater. 2 and 3 show an electric water heater according to an embodiment of the present invention, and FIG. 2 is a diagram showing its electric circuit. FIG. 3 is a perspective view showing its appearance, and FIG. 4 is a diagram showing an electric path of an electric water heater according to another embodiment of the present invention. Note that the same reference numerals in the figures indicate the same or similar parts. (5) is a water heater, (9) is a motor timer, 0
1 is the temperature sensing element 0. (111 is the switching contact of temperature sensing element C. Agent Masuo Oiwa Figure 3 Figure 4

Claims (1)

[Scope of Claims] In an electric water heater that boils water using a water heater, 1
A timer that starts when energized and energizes the water heater for a set time; and a timer that energizes the water heater until the water temperature reaches a predetermined temperature lower than 100°C, and when the water temperature exceeds the predetermined temperature. In addition to cutting off the electricity to the water heater. An electric water heater comprising a temperature sensing element that starts the timer by supplying electricity to the timer.