JP2929285B1 - Hot water storage type electric water heater - Google Patents

Abstract

[Problem] To always supply a user with a suitable temperature of hot water,
The tapping efficiency is improved, and the hot water in the hot tub is prevented from overflowing. A hot water tank (2) for heating and storing hot water, a heating element (1) disposed below the hot water tank (2) for heating the water, a water supply pipe (8) for supplying water to the hot water tank (2), and the hot water tank (2) A temperature sensor 5 for detecting the temperature of the hot water in the hot water bath, a control device for appropriately adjusting the water level and the hot water temperature in the hot water bath 2, and a water supply passage from the water supply pipe 8 to the hot water bath 2 according to a signal from the control device. A water supply valve 6 that opens and closes, and the control device moves a water level sensor that detects a water level in the hot water tub 2 to an appropriate position in the hot water tub 2.
By providing one or more, the water level is controlled while the temperature of the hot water is kept within the temperature change from the set temperature to the lower limit of the set temperature.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention is mainly used as a water heater for a company, office, hospital, public facility, etc.
The present invention relates to a hot water storage type electric water heater used as a water heater of a vending machine or the like.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 4, this type of hot water storage type electric water heater is of an open-to-atmosphere type, and has a ball tap 22 for controlling a water level and a thermostat for controlling a temperature in an upper part of a water bath 21. 23, and a heating element 24 at the lower portion of the hot water bath 21 and store water in the hot water bath 21;
This water is boiled by the heating element 24, the temperature control is automatically performed by the thermostat 23, and the water level control is automatically performed separately by the ball tap 22.

[0003]

However, the conventional method has an advantage that the temperature is automatically adjusted by the thermostat 23 and the water level is automatically maintained at the full level by the ball tap 22. Since the temperature control is performed separately, when the faucet is opened and hot water is supplied from the hot water supply pipe 25, the ball tap 22 is lowered regardless of the hot water temperature, and the hot water is immediately supplied into the hot water tank 21. It was too thin to keep the hot water at the right temperature.

[0004] Therefore, in order to minimize the drop in hot water temperature due to water supply, a water guide pipe 26 is installed in the hot water tank 21,
Although the water discharged from the ball tap 22 is guided to the bottom of the water bath 21 to minimize the mixing with the water in the upper layer, even if a large amount of water is used at one time, the same effect as this is obtained. Since a large amount of water is supplied into the hot water tank 21, the temperature of the hot water is greatly reduced, and it takes a long time until the water is heated to a temperature suitable for drinking.

[0005] Also, the hot water supply efficiency was poor when measured from the amount of hot water stored in the hot water bath 21 and the heater capacity of the heating element 24. In addition, since the water level of the ball tap 22 is easily changed due to a difference in water pressure, there is a possibility that the hot water in the hot tub 21 overflows from the overflow pipe 27.

Therefore, the object of the present invention has been created in view of the above-mentioned point of view. In consideration of the water level control and the temperature control integrally, the ball tap for water level control conventionally used is omitted. The electrode and solenoid valve allow the water level to be controlled while maintaining the temperature of the hot water at an appropriate temperature, so that the user can always supply hot water at the appropriate temperature to the user, improve the tapping efficiency, and reduce the difference in water pressure. Accordingly, an object of the present invention is to provide a hot water storage type electric water heater that can prevent hot water in a hot water tank from overflowing.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a hot water storage type electric water heater according to the present invention is provided with a hot water tank for heating and storing hot water, and a hot water tank disposed below the hot water tank. A heating element for heating water, a water supply pipe for supplying water to the water bath,
A temperature sensor for detecting the temperature of the hot water in the hot tub, a control device for appropriately adjusting the water level and the hot water temperature in the hot tub, and a signal from the control device for appropriately opening and closing a water supply passage from the water supply pipe to the hot tub. A water supply valve, wherein the control device moves a water level sensor for detecting a water level in the hot water tank to an appropriate position in the hot water tank.
By providing one or more, the water level is controlled while the hot water temperature is kept within a temperature change from a set temperature to a lower limit of the set temperature.

Further, the water level sensor is a water amount sensor for detecting the amount of water flowing into the hot water tank, and is provided on the water supply side of the water supply pipe.

In addition, a check valve for preventing backflow is provided as a safety device on the water supply side of the water supply valve outside the hot water tank.

Further, a constant flow valve or a pressure reducing valve is provided on the water supply side of the water supply valve outside the hot water tank to maintain a constant flow regardless of the level of the water pressure.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below mainly for use as water heaters in companies, offices, hospitals, public facilities, etc., or as water heaters in tea heaters, vending machines, and the like. Will be described with reference to the drawings.

As shown in FIGS. 1 to 3, a hot water storage type electric water heater according to the present invention has a hot water tank 2 for heating water to store hot water, and a heat generating heater disposed below the hot water tank 2 for heating the water. A body 1, a water supply pipe 8 for supplying water to the hot tub 2, a temperature sensor 5 for detecting a hot water temperature in the hot tub 2, a control device for appropriately adjusting a water level and a hot water temperature in the hot tub 2, A water supply valve 6 for appropriately opening and closing a water supply passage from the water supply pipe 8 to the hot water tub 2 in response to a signal from the control device; and the control device includes a water level sensor for detecting a water level in the hot water tub 2 inside the hot water tub 2. By providing one or more at appropriate positions, the water level is controlled while the temperature of the hot water is kept within a temperature change from a set temperature to a lower limit of the set temperature.

That is, as shown in FIG. 1, a heating element 1 such as a heater is provided at the center of the bottom of the water bath 2 and a water level sensor of the control device is provided at a lower portion of the water bath 2 for controlling a lower limit water level. An empty boil prevention electrode 3 and a temperature sensor 5 for detecting hot water temperature are provided, and an upper limit water level electrode 4 for controlling an upper limit water level is provided as a water level sensor of the control device in an upper part of the hot water tank 2.
Above the upper limit water level electrode 4, an overflow detection electrode 7 is provided as a water level sensor of the control device for detecting overflow as a safety device for the upper limit water level electrode 4 and the water supply valve 6.

A solenoid valve serving as the water supply valve 6 is provided between the bottom of the water bath 2 and the water supply pipe 8 and a constant flow valve or a pressure reducing valve for maintaining a constant flow regardless of the level of water pressure. A valve 9 and a check valve 10 for preventing backflow as a safety device are sequentially connected.

In addition, between the heating element 1 and each of the electrodes such as the empty-burning prevention electrode 3, the upper-limit water level electrode 4, and the overflow detection electrode 7, the water level is set to the empty-fire prevention electrode 3, the upper-limit water level electrode 4, and the overflow. A controller 11 for detecting that the position of the detection electrode 7 or the like has been reached and controlling the temperature is connected.

Reference numeral 12 in the figure denotes an overflow pipe arranged in the hot tub 2 so that the upper end thereof is slightly higher than the overflow detecting electrode 7 in order to prevent the water level in the hot tub 2 from becoming abnormally high. Reference numeral 13 denotes a hot water supply pipe arranged in the hot water tank 2 so that an upper end thereof is slightly higher than the heating element 1.

As shown in FIGS. 1 and 2, the boil-up operation is performed by first supplying the water supply valve 6 to the empty-fire prevention electrode 3.
Water is supplied by a solenoid valve as described above, and the supply of water is temporarily stopped. Here, the controller 11 detects that the water level has reached the position of the non-burning prevention electrode 3, and energizes the heating element 1 to start heating. Then, the temperature of the hot water in the hot tub 2 is detected by the temperature sensor 5 and is set near the set temperature (approximately 95 degrees).
When the temperature rises to around 94 degrees), water supply is started by the solenoid valve as the water supply valve 6, and when the hot water temperature falls to the lower limit of the set temperature (about 95 degrees) (about -3 degrees of the set temperature, about 92 degrees), Also, the water supply is stopped. At this time, when the water level is equal to or higher than the idling prevention electrode 3 and is lower than the upper limit water level electrode 4, the heating element 1 is always set to O.
In the N state, the operation of raising the hot water temperature near the set temperature by the heating element 1 and the operation of supplying water until the hot water temperature falls to the lower limit of the set temperature by the solenoid valve serving as the water supply valve 6 are performed thereafter. The water level is gradually raised while repeating the above, and when the water level reaches the upper limit water level electrode 4, the water supply is stopped regardless of the hot water temperature at that time.
Is configured so that the temperature sensor 5 detects when the hot water temperature has risen to the set temperature, and the controller 11 stops heating.

In addition, as shown in FIG.
As in the conventional hot water storage type electric water heater, when the temperature of the hot water drops below the temperature width of the differential (ON / OFF operation gap), the heating element 1 is turned on and heated to the set temperature (the normal heater ON). / OFF operation).

As shown in FIG. 2, when the faucet is opened, hot water is supplied from the hot water supply pipe 13, and when the water level falls below the end of the upper limit water level electrode 4, the controller 11 determines that the hot water is supplied. Is detected. At this time, the controller 11 immediately turns on the heating element 1,
If the hot water temperature is equal to or higher than the set temperature, water supply is started by the solenoid valve serving as the water supply valve 6, and when the hot water temperature is reduced to the lower limit of the set temperature by this water supply, the water supply is stopped. When the temperature of the hot water rises above the set temperature or more, water supply is started (at this time, the heating element 1 is also in the ON state). Thereafter, similarly to the above-described boiling operation, the water level is gradually increased, and when the water level reaches the upper limit water level electrode 4, the operation shifts to the above-described heat retaining operation.

Further, if the hot water temperature is equal to or higher than the differential temperature range of the above-mentioned heat retaining operation and the water temperature has not reached the upper limit water level electrode 4, the operation shifts to the additional cooking operation as shown in FIG.

Further, in the case of continuous hot water supply, since the hot water is supplied while maintaining an appropriate temperature range by the above hot water supply operation, the water supply cannot follow the water supply, and the water level gradually decreases. The water level drops below 3,
The controller 11 detects that the water level has reached a position below the empty firing prevention electrode 3, and stops the power supply to the heating element 1 for safety (at this time, water supply is continued).

In the hot water storage type electric water heater of the present invention, when the water level is equal to or higher than the non-burning prevention electrode 3 and lower than the upper limit water level electrode 4, the heating element 1 is always turned on. ,
Thereafter, the operation of raising the hot water temperature near the set temperature by the heating element 1 and the operation of supplying water until the hot water temperature drops to the lower limit of the set temperature by the solenoid valve serving as the water supply valve 6 are repeated, and the water level gradually rises. Although it is described that the water is supplied, the water is supplied to the water tank 2 by a solenoid valve as the water supply valve 6 in a fixed amount (for example, 1 liter). The water temperature may be raised near the set temperature by the body 1 and the water level may be gradually raised.

[0023]

As described above, the hot water storage type electric water heater of the present invention has a hot water tank 2 for heating water to store hot water, and a heating element 1 disposed below the hot water tank 2 for heating the water. A water supply pipe 8 for supplying water to the hot tub 2, a temperature sensor 5 for detecting the hot water temperature in the hot tub 2, a control device for appropriately adjusting the water level and the hot water temperature in the hot tub 2, And a water supply valve 6 that appropriately opens and closes a water supply path from the water supply pipe 8 to the hot water tub 2 in response to the signal. The control device controls a water level sensor for detecting a water level in the hot water tub 2 at an appropriate position in the hot water tub 2. The water level is controlled while keeping the temperature of the hot water from the set temperature to within the lower limit of the set temperature by providing one or a plurality of water heaters. , Temporarily stop water supply at the position of the lower water level sensor, Is energized to start heating, then,
The temperature of the hot water in the hot tub 2 is detected by the temperature sensor 5 and the set temperature (approximately
When the temperature rises to around 95 degrees) (approximately 94 degrees, which is -1 degree of the set temperature), the water supply valve 6 starts water supply, and the hot water temperature becomes lower than the set temperature (approximately 95 degrees). About 92 degrees)
When the water level is lowered, the water supply is stopped by the water supply valve 6. At this time, when the water level is equal to or higher than the lower water level sensor and lower than the upper water level sensor, the heating element 1 is always turned on. Thereafter, the water level gradually rises while repeating the operation of increasing the hot water temperature near the set temperature by the heating element 1 and the operation of supplying water until the hot water temperature falls to the lower limit of the set temperature by the water supply valve 6. When the water level reaches the upper water level sensor, the water supply is stopped by the water supply valve 6 irrespective of the hot water temperature at the time, and the heating element 1 is heated when the hot water temperature rises to the set temperature. Stop. In this way, by performing the sequence control, the water level can be raised without significantly lowering the temperature than the set temperature of the hot water temperature.

Therefore, considering the water level control and the temperature control integrally, the ball tap for water level control which has been conventionally used is omitted, and the water level is controlled while maintaining the temperature of the hot water at an appropriate temperature by the control device and the water supply valve 6. Therefore, the user can always be supplied with hot water at an appropriate temperature.

Moreover, even if the tapping efficiency is measured by making the amount of hot water in the hot water tank 2 or the heater capacity of the heating element 1 the same as that of the conventional hot water storage type electric water heater using a ball tap, the hot water storage type of the present invention can be used. Electric water heaters have better tapping efficiency.

In addition, since the ball tap is not used for controlling the water level, it is possible to prevent the hot water in the hot tub 2 from overflowing without changing the water level due to a difference in water pressure.

Further, by providing the water level sensor as a water amount sensor for detecting the amount of water flowing into the hot tub 2 and providing this on the water supply side of the water supply pipe 6, the amount of water flowing into the hot tub 2 can be reliably detected. .

Further, by providing the check valve 10 on the water supply side of the water supply valve 6 outside the hot water tub 2, backflow can be prevented, so that the safety is extremely excellent.

In addition, by providing the constant flow valve or the pressure reducing valve 9 on the water supply side of the water supply valve 6 outside the hot water tank 2, a constant flow rate can be obtained regardless of the level of the water pressure. Can have characteristics.

[Brief description of the drawings]

FIG. 1 is a schematic front view showing one embodiment of the present invention.

FIG. 2 is a flowchart showing a hot water supply state and a hot water supply state of the present invention.

FIG. 3 is a flowchart showing a heat retaining state of the present invention.

FIG. 4 is a schematic front view showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Heating body 2 Hot water tank 3 Prevention electrode for empty firing 4 Upper limit water level electrode 5 Temperature sensor 6 Water supply valve 7 Overflow detection electrode 8 Water supply pipe 9 Constant flow valve or pressure reducing valve 10 Check valve 11 Controller 12 Water overflow pipe 13 Hot water supply pipe

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) A47J 27/21 101 A47J 31/56

Claims (4)

(57) [Claims] 1. A water bath for heating water to store hot water, a heating element disposed below the water bath to heat the water, a water supply pipe for supplying water to the water bath, and a water temperature in the water bath. A temperature sensor for detecting, a control device for appropriately adjusting a water level and a hot water temperature in the hot water tank, and a water supply valve for appropriately opening and closing a water supply path from the water supply pipe to the hot water bath with a signal from the control device, By providing one or more water level sensors for detecting the water level in the hot tub at appropriate positions in the hot tub, the control device controls the water level while keeping the hot water temperature within a temperature change from a set temperature to a set temperature lower limit. A hot-water storage type electric water heater characterized in that it is made to do. 2. The hot water storage type electric water heater according to claim 1, wherein the water level sensor is a water amount sensor for detecting an amount of water flowing into the hot water tank, and is provided on a water supply side of a water supply pipe. 3. The hot water storage type electric water heater according to claim 1, wherein a check valve for preventing backflow is provided as a safety device on a water supply side of the water supply valve outside the hot water tank. 4. A hot-water storage type electric appliance according to claim 1, wherein a constant flow rate valve or a pressure reducing valve is provided on a water supply side of a water supply valve outside the hot water tank to maintain a constant flow rate regardless of the level of water pressure. Water heater.