JPH0268451A - Small-sized electrical hot water boiler - 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 [Industrial Field of Application] The present invention relates to a small electric water heater that is incorporated into a bathroom vanity.

[Conventional technology] There are two methods for supplying hot water to the bathroom vanity from a water heater:
Conventionally, two methods have been used. The first method is the central hot water supply method, which supplies hot water from late-night electric water heaters or large gas instantaneous water heaters, and has sufficient hot water supply capacity because it is equipped with a large-capacity heat source.

The second method uses a small gas instant water heater or electric water heater.
It can be installed in the bathroom or built into the vanity.
There are two types of electric water heaters used in this method: storage type and instantaneous type, which supply hot water to the bathroom.

In addition, some small electric water heaters are connected to hot water piping from a central water heater rather than directly to the water supply piping, which is a disadvantage of the central water heating system. Some are equipped with a tank or electric heater to compensate for the slow time it takes for hot water to come out.

``Problem to be solved by the invention'' By the way, among the conventional methods of supplying water to washrooms, those that use small electric water heaters do not have sufficient hot water supply capacity for hot water supply loads such as hair washing. In order to achieve this, it is necessary to increase the tank capacity sufficiently for the hot water storage type, and the output of the electric heater for the instantaneous type. There is a problem in that it is difficult to supply power from.

For example, although there are individual differences, the amount of hot water that a woman uses to wash her hair is 7 L/min, a hot water temperature of 40°C, and a water temperature of 5°C, using hot water intermittently for 5 minutes, and washing her hair in 10 minutes. The amount of heat (Hl) required to heat the hot water for hair washing is 141 = IKcal.
/ L 6 c X (40-5>6 CX
7L/minX5min=1225Kcal.

If this hot water supply load is covered by a hot water storage type water heater equipped with a small capacity electric heater of about IKw, the boiling temperature will be 90°.
In this case, the capacity (V) of the tank is (However, it is assumed that the electric heater is not energized during hot water supply).

Furthermore, in reality, in the latter half of hot water supply, the supplied water and hot water are mixed in the tank, and the hot water temperature falls below 4.0'C, so the tank capacity needs to be larger than this calculated value.

In this type of hot water storage system, where hot water stored in a tank covers the hot water supply load, the capacity of the tank needs to be as large as 144cm, which makes it difficult to incorporate it into a bathroom vanity. .

In addition, in order to cover the above-mentioned hot water supply load with an electric heater in an instantaneous water heater, the capacity of the electric heater (1'l) must be 85.5A with a single-phase 200V power supply. It becomes impossible.

Furthermore, conventional small electric water heaters have the problem of poor operability because they manually control the temperature of hot water and start and stop the water supply.

This invention was made to solve these problems, and includes a small-capacity electric heater that can be used with a household power source and a small tank that can be built into a washroom.
The purpose of the present invention is to provide a compact electric water heater that can sufficiently cope with the hot water supply load required for hair washing and has excellent operability.

[Means for Solving the Problems] The small electric water heater according to the present invention assumes the maximum amount of hot water supply (hereinafter referred to as the maximum hot water supply load) of hot water that is used continuously in a short period of time, and A small hot water storage tank with a smaller hot water storage capacity can store enough hot water to cover the hot water supply load.
It was decided that this would be provided by both an electric heater and the entire system would be controlled remotely using a remote control.

[Function] In this invention, hot water sufficient to cover the maximum hot water supply load is provided by both a small hot water storage tank with a smaller hot water storage capacity and an electric heater. Although it has a high-capacity electric heater and a small tank that can be built into the washroom, it can supply enough hot water to meet the hot water load required for washing hair, and the entire system can be controlled remotely using a remote control. , operation becomes easier.

[Example] The present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the configuration of a small electric water heater according to the present invention.
In the figure, (1) is the casing, (2) is the hot water storage tank,
(3) is electric heater, (4) is hot water piping, (5) is safety valve, (6) is mixing valve, (7) is electric valve, (8) is hot water piping, (9) is water supply piping, (1o ) is a pressure reducing check valve, (11
) indicates a controller, (12) indicates a temperature detector, and (13) indicates a remote control operation section.

The small electric water heater according to the present invention has a small hot water storage tank with an electric heater (3) arranged at the bottom as shown in Fig. 1.
2) is stored in a casing (1), and a hot water pipe <4) is connected to the upper part of this hot water storage tank <2), and a water supply pipe (9) is connected to the lower part. A safety valve (5) is attached to this hot water pipe (4), and an electric mixing valve (6) is attached to the middle of the pipe. The wax thermometer allows the hot water temperature setting to be changed freely by motor drive, and the hot water tap pipe (8) is connected to the tip of the mixing valve (6) via an electric valve (7). In addition, a pressure reducing check valve (10) is attached to the water supply pipe (9), and the water supply pipe (9) branches in the middle to supply water to the hot water tank (2) and mixing valve (6). There is.

A controller 11) is installed in the negative corner of the casing (1), and this controller (11) includes a temperature detector (12), an electric heater <3), a mixing valve (6), and an electric valve (7). and a remote control operation section (13) via an electric circuit.

FIG. 2 is a diagram for explaining the remote control operation unit (13) shown in FIG. There is a group of LEDs to display, and this remote control operation section (
13) is placed on the front panel of the dressing table, etc.

Next, a method of determining the capacity of the hot water storage tank (2) and the output of the electric heater (3) according to the present invention will be explained. As mentioned above, the small electric water heater according to the present invention assumes a maximum hot water supply load, and can generate enough hot water to cover this maximum hot water supply load by using both a small hot water storage tank with a smaller hot water storage capacity and heating by an electric heater. If we assume that the maximum hot water supply load is the amount of hot water used for washing a woman's hair as described above, for example, if the capacity of the hot water storage tank (2) is
゜U, the hot water storage tank (2) can store hot water at 90'C and the difference is H24Kcal/L -0CX (90-5)6C when converted to heat (H2).
X10L850 Kcal, which is, for example, 4
When converted to 0'C hot water, it is 850 Kcal/(40
-5)' C=24. ．． The amount will be 4L. On the other hand, the maximum hot water supply load, that is, the amount of hot water used for washing women's hair, is 7.
Since the size is 35L, 35L-24.4L
= 10.6 L, which means that the amount of heat equivalent to 10°6 L of 40'c hot water is insufficient. In order to make up for this lack of heat by heating the water supplied with the electric heater (3) to boil the water within 10 minutes of the hair washing time, the temperature of the supplied water must be 5°
The assumed deviation is (40-5) °CX 10.6L
= 375 Kcal of heat is required, and to obtain this heat, the output (W) of the electric heater is: In other words, in this invention, the hot water storage tank (2) has a capacity of 10
A small tank of L, and the capacity of the electric heater (3) is 2.
．． 62 Kw.

In this case, 35 minutes of hot water at 40°C will be used up after 10 minutes of hair washing, so the hot water storage tank (2) will be filled with water at a supply temperature of 5°C after washing hair. In order to wash the next person's hair, heat this water to 90°C.
You will have to bathe in the water, and for this you will have to wait. Therefore, when multiple people wash their hair in succession, it is necessary to increase the capacity of the electric heater (2). For example, when you finish supplying the hot water needed for the first hair wash, the water temperature in the hot water storage tank (2) is set to 40°.
To make C, 375 Kcal+10LX (40-
5)°C=725 Kcal・5. The reheating time at this time is 6.8 minutes, allowing multiple people to wash their hair almost continuously.

That is, in this invention, the amount of hot water that can cover the maximum hot water supply load is provided by both a small hot water storage tank with a smaller hot water storage capacity and an electric heater, and the hot water storage tank (
The capacity of 2) and the output of the electric heater (3) do not need to be fixed, and can be adjusted to the optimal capacity and output according to the installation situation such as the size of the washbasin to be incorporated, and the expected maximum hot water supply load. can be selected.

Next, the operation of the small electric water heater according to the present invention will be explained. As shown in Figure 2, by pressing the hot water supply switch (14) provided on the remote control operation unit (13), the controller (11) is activated and the electric valve (7) is opened to open the hot water tank (2). The hot water that had been stored at a temperature of 90'C flows out through the hot water piping 4). This flowing water is
The water is mixed with the water sent from the water supply pipe (9) by the mixing valve (6), and the hot water temperature reaches the temperature set by the hot water temperature setting switch (15). That is, the hot water temperature setting switch (15) is designed to set the hot water temperature in the range of 30° to 50°C, and the controller (11) operates the mixing valve (6) based on this set value. By changing the mixing ratio of hot water from the hot water storage tank (2) and water from the water supply pipe (9), the hot water supply temperature is made to match the set temperature.

On the other hand, as hot water is discharged from the hot water storage tank (2), water starts being supplied to the hot water storage tank (2) from the water supply pipe (9). The temperature detector (12) monitors the temperature of the hot water storage tank (2), and the water supply from the water supply pipe (9) causes the water temperature in the hot water storage tank (2) to reach a predetermined boiling temperature (for example, 9
0°C), this is transmitted to the controller (11), and the controller (11) energizes the electric heater 3) to heat the hot water in the hot water storage tank (2).

This heating is performed until the temperature of the hot water in the hot water storage tank (2) reaches the boiling temperature, and continues even when the hot water supply is stopped to use detergent during hair washing, for example.

Note that the hot water supply load varies depending on the water supply temperature, so there is sufficient leeway in the hot water supply capacity in the summer when the water temperature is high. Therefore, in the summer when the water supply temperature is high, the set value of the boiling temperature in the hot water storage tank (2) can be lowered, and by lowering the temperature after boiling, the heat dissipation from the hot water storage tank (2) is suppressed and heat loss is reduced. It is possible to reduce it.

Further, in the above embodiment, a combination of a wax thermometer and a motor is used for the mixing valve (6), but other types of electric valves can also be used.
A normal electromagnetic valve may be used instead of the electric valve (10) for opening and closing.

In addition, when the small electric water heater according to the present invention is installed in a bathroom vanity, the general usage is that hot water is not stored in the sink of the vanity, so it is used only a few times, and therefore the used water is drained. Since it is thought that the water still contains a considerable amount of heat, it is possible to further save energy by using a heat exchanger to exchange heat between the discharged water and the supplied water. It is also possible to reduce the output of the electric heater (3).

Furthermore, in the first embodiment, the hot water supply switch (
14) is started and stopped by hand, but in order to save time while washing hair, a foot-operated switch is placed on the floor in parallel with the hot water supply switch (14). As the hot water supply operation is performed, the operability of the layer will be improved.

Next, another embodiment of the invention will be described. FIG. 3 is a block diagram showing the general structure of another embodiment of the present invention, in which the same reference numerals as in FIG. 1 indicate the same or corresponding parts, and (20) is a constant flow valve. In this embodiment, the water supply pipe (9) is equipped with a constant flow valve 20) to keep the amount of water supplied flowing into the hot water storage tank 2) constant. ) This is to prevent the so-called running out of hot water, which lowers the temperature of the hot water inside the bath. As the constant flow valve (20), a disk supported by a spring is disposed in the contraction part, and when the differential pressure before and after the disk changes, the disk is moved to change the cross-sectional area of the contraction part. , formula, Q=aCXr2g/γ・Δp (however, Q: flow rate Δp: differential pressure, a: cross-sectional area of the contraction part (at, a2...an
), c: flow rate (1 g; acceleration of gravity; γ: specific weight), so that a constant flow rate can always be obtained.

This constant flow valve (20) can always supply a constant flow rate even if the valve's primary pressure, secondary pressure, or both change at the same time, and can also supply an arbitrary flow rate due to the design of the flow contraction section. In this example, 7L/
It is suitable to use something of about min.

[Effects of the Invention] As explained above, this invention uses both a small hot water storage tank (with a smaller hot water storage capacity) and an electric heater to supply enough hot water to cover the maximum hot water supply load. It has a small-capacity electric heater that can be used with a commercial power supply and a small tank that can be built into the washroom, and is able to supply enough hot water to meet the hot water load required for washing hair.
The entire system is controlled remotely using a remote control, which has the effect of making it easier to operate.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of a small electric water heater according to the present invention, FIG. 2 is a diagram for explaining the remote control operation section shown in FIG. 1, and FIG. 3 is a diagram showing another embodiment of the present invention. FIG. 2 is a block diagram showing a schematic configuration. (1) is the casing, (2) is the hot water tank, (3) is the electric heater, (4) is the hot water piping, (6) is the mixing valve, (7)
is an electric valve, (8) is a hot water outlet pipe, (ku) is a water supply pipe, (1)
1) is a controller, (12) is a temperature detector, 13) is a remote control operation unit, (14) is a hot water supply switch, (15) is a hot water supply temperature setting switch, and (20) is a constant flow valve. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (1)

[Scope of Claims] In a small electric water heater that has a hot water storage tank with an electric heater installed inside and supplies hot water to a washroom, etc., the capacity of the hot water storage tank is limited to the amount of water that is used continuously for a short period of time. Means for setting the capacity to be smaller than the amount of hot water that can cover the maximum hot water supply heat amount (hereinafter referred to as the maximum hot water supply load) of A small electric water heater characterized in that it is equipped with means for setting an output to heat water supplied during continuous use to compensate for the shortage of load.