JPH0622858A - Hot-water supply device - Google Patents

Abstract

PURPOSE:To always supply hot water of a prescribed temperature by detecting a water temperature supplied from a water tank to a boiler, boiling water in the boiler by a sheathed heater and stopping heating, when the set possible hot-water supply quantity exceeds the quantity to be supplied vessel to which hot water is supplied. CONSTITUTION:Water in a water tank 2 passes through a valve 2a of a bottom part and a hydraulic switch 7, is detected as to a water temperature by a thermistor 9 and guided to a boiler 8. Hot water heated by a sheathed heater 8a of the boiler 8 is detected as to its temperature by a thermistor 10, and supplied to a drip vessel 3 being a vessel to which hot water is supplied through a pipe 6b. The hot-water supply quantity and a hot-water supply temperature are detected at a every prescribed time, and when the hot-water supply quantity exceeds the hot-water supply quantity to be supplied, heating by the sheathed heater 8a is stopped, and the valve 2a is closed. Also, when water in the water tank 2 becomes empty, the hydraulic switch 2 turns off the sheathed heater 8a. In such a way, stable hot-water supply is always executed automatically. This hot-water supply device is suitable for a coffee maker for business use.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water heater used as, for example, a coffee extractor for business use.

[0002]

2. Description of the Related Art In a conventional water heater, for example, a coffee extractor, a heating device (boiler) is provided in the middle of a hot water supply passage communicating with a water tank, and this device causes water in the hot water supply passage to boil and boil. Each time, the boiling pressure is used to supply hot water to the drip container containing the coffee powder or the like, the other end of which is open.

By supplying hot water to coffee powder or the like in the drip container, coffee liquid or the like is extracted, and the extracted coffee liquid or the like is stored in a bottle (hot water supply container) set under the drip container. There is.

The amount of hot water supplied to coffee or the like is adjusted by adjusting the amount of water stored in the water tank in accordance with the desired amount of hot water supplied, and then supplying all the water stored in the water tank to obtain the desired amount of hot water supplied. There is. In this method, when the amount of water in the water tank is exhausted, the power supply to the heating device is stopped. As another method, the energization time of the heating device is controlled by a timer, and the energization time of the timer is set corresponding to the desired hot water supply amount, and the energization time set by the timer is applied to the desired value. There is a way to get the hot water supply.

[0005]

As described above, in a conventional water heater, for example, an extractor such as coffee, which supplies all the water stored in the water tank to stop the energization of the heating device, the coffee Each time hot water is supplied to the water tank, it is necessary to fill the water tank with an amount of water corresponding to the desired amount of hot water, which is troublesome.

Further, in the case of controlling the energization time of the heating device by a timer, the temperature of water supplied from the water tank to the heating device changes depending on the season, and the heating characteristics of heaters used in the heating device vary. Therefore, there is a problem that the desired hot water supply amount may not be obtained accurately even if the energization time corresponding to the desired hot water supply amount is set.

Therefore, an object of the present invention is to provide a water heater which can accurately obtain a desired amount of hot water supply and which can save the trouble of considering the amount of water to be put in the water tank.

[0008]

The present invention relates to a water tank for storing water, a heating means for heating water supplied from the water tank in accordance with the amount of current supplied, a hot water supply container, and a water tank. A hot water supply path for supplying water to the heating means and supplying water boiled by the heating means to the hot water supply container,
A hot water supply amount setting means for setting a desired hot water supply amount, a water temperature detecting means for detecting the temperature of water supplied from the water tank to the heating means, and a hot water supply container to be supplied based on the water temperature detected by the water temperature detecting means The hot water supply amount calculating means for calculating the amount of hot water supplied at predetermined time intervals, and when the hot water supply amount calculated by the hot water supply amount calculating means becomes equal to or more than the hot water supply amount set by the hot water supply amount setting means, the heating means stops heating the water. A heating control means is provided.

[0009]

In the present invention having such a configuration, the desired hot water supply amount is set by the hot water supply amount setting means.

Water is supplied to the heating means from the water tank via the hot water supply path. When the heating means is energized, the heating means heats the water, and the water boils and is supplied to the hot water supply container via the hot water supply path and is stored therein.

The hot water supply amount calculating means calculates the amount of hot water supplied to the hot water supply container based on the water temperature detected by the water temperature detecting means at predetermined time intervals. When the calculated hot water supply amount becomes equal to or more than the hot water supply amount set by the hot water supply amount setting means, heating of the water by the heating means is stopped. Therefore, the supply of boiling water from the heating means to the hot water supply container is stopped.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In this embodiment, the present invention is applied to a drip-type electric coffee brewer. FIG. 1 is a front view showing the configuration of the drip-type electric coffee brewer, and 1 is a water heater body. The body 1 has a hot water supply section 1a and a hot water supply section 1
b and the bottle mounting portion 1c are formed. A cartridge-type water tank 2 is detachably provided on the upper surface of the hot water supply portion 1a, and a drip container 3 is detachably provided on the lower surface of the hot water supply portion 1b. Further, a bottle 4 as a hot water supply container is placed at a predetermined position on the upper surface of the bottle placing section 1c.

Further, an operation / display panel 5 is provided on the front surface of the hot water supply section 1a. As shown in FIG. 2, the operation / display panel 5 is provided with a power switch 5a, a warmer switch 5b, a cup adjustment switch 5c, a start / stop switch 5d, and is composed of an LED (light emitting diode). A power lamp 5e, a warmer lamp 5f, a cup number display lamp 5g, and a hot water discharge lamp 5h are provided.

Of the cup number display lamps 5g, only the lamp at the "4" position lights up when the cup adjustment switch 5c is pressed once, and the lamp at the "6" position when pressed twice. Only the next lamp will light up in turn every time it is pressed. 6
When pressed down, only the lamp at position "15" lights up,
When the button is pressed seven times, only the lamp at the position "4" is turned on again, and the lighting order of the lamps is cycled. FIG. 3 is a schematic sectional view showing the structure of this drip type electric coffee brewer.

At the bottom of the water tank 2, the water tank 2
There is provided a water supply valve 2a which is opened only when is set in the hot water supply body 1 and is closed in other states. In the present invention, the water tank 2 may be formed integrally with the hot water supply body 1 instead of being removable.

Inside the water heater body 1, the water supply valve 2 is provided.
A hot water supply path 6 communicating with a is formed. In this hot water supply path 6, a water supply pipe portion 6a directly communicating with the water supply valve 2a is connected to a side surface of a boiler 8 as a heating means via a water pressure switch 7, and a hot water supply pipe portion 6b is provided from the upper surface of the boiler 8. The hot water supply portion 1b of the hot water supply body 1 is formed by being connected to a hot water supply port 6c which is open downward to supply boiling water to the drip container.

The entire water supply pipe portion 6a is formed to have a smaller diameter than the hot water supply pipe portion 6b so as to prevent backflow of water (hot water) from the boiler 8 to the water tank 2. There is. The hot water supply pipe portion 6b has a portion arranged at a position higher than the highest water level of the water tank 2, and is connected to the hot water supply port 6c via this portion.

Incidentally, the water pressure switch 7 is the water supply pipe section 6
It is composed of a diaphragm 7a forming a part of a and a micro switch 7b provided on the outside of the diaphragm 7a. The micro switch 7b is turned on by the expansion of the diaphragm 7a to the outside by water pressure. When there is water in the tank 2, it is in the on state, and when the water in the water tank 2 is exhausted, the expansion of the diaphragm 7a to the outside is canceled and the micro switch 7b is turned off. Further, the boiler 8 is installed below the water supply valve 2a, and is formed by casting a sheath heater (1200W) 8a inside an aluminum die casting.

The water pressure switch 7 of the water supply pipe 6a
A protrusion protruding outward and downward is formed between the boiler and the boiler 8. Further, a convex portion is further formed inside the projecting portion, and a water temperature detecting thermistor 9 as a water temperature detecting means for detecting the water temperature reaching the boiler 8 is provided outside (downward) of the convex portion. Further, a boiler temperature detecting thermistor 10 for detecting the temperature of the boiler 8 is installed outside the upper portion of the boiler 8.

The drip container 3 is formed in a bowl shape, and a paper filter containing coffee powder is detachably housed therein. The boiling water supplied to the drip container 3 is dripped over time from the hot water supply valve 3a formed at the bottom of the drip container 3 into the bottle 4. The hot water supply valve 3a is designed to be opened by placing the bottle 4 below, and is closed at other times.

Bottle placing section 1 on which the bottle 4 is placed
A plate-shaped warmer (90 W) 11 is provided in c, and heats the bottle 4 so as to maintain a predetermined temperature. FIG. 4 shows a block diagram of a circuit configuration of a main part of this drip type electric coffee brewer.

Electric power from the commercial AC power supply (AC100V) 21 is input to the power supply substrate circuit 31. The commercial AC power supply 21 includes a series circuit including a normally open contact 22 of the first relay, the warmer 11 and a temperature adjusting thermostat 23, a normally open contact 24 of the second relay, the sheath heater 8a, and a temperature fuse ( An operating temperature of 169 ° C.) 25, a series circuit of the microswitch 7b and a thermostat (operating temperature of 130 ° C.) 26 are connected to each other.

The power board circuit 31 is for adjusting the on / off temperature of the exciting coil (RA) 32 of the first relay, the exciting coil (RB) 33 of the second relay, and the temperature adjusting thermostat 23. A variable resistor 34 for adjusting the hot water temperature is connected, and further, the thermostat 2 is connected to a current sensor 35 provided in the power supply substrate circuit 31.
A power supply line from 6 to the commercial AC power supply 21 is provided. The exciting coil 32 of the first relay is energized when the warmer switch 5b is operated, and deenergized when it is turned off.

The power supply substrate circuit 31 is provided with a transformer, a rectifying / smoothing circuit, a constant voltage circuit, etc., and converts the alternating current supplied from the commercial alternating current power supply 21 into a constant voltage direct current. It is adapted to be supplied to the microcomputer board circuit 41. A control signal and the like are output from the microcomputer board circuit 41 to the power supply board circuit 31, and a detection signal from the current sensor 35 of the power supply board circuit 31 is output to the microcomputer board circuit 41. It has become so.

The microcomputer board circuit 41 is provided with a microcomputer 42 that constitutes the main body of the control unit together with various interfaces and various controllers.
Further, the operation / display panel 5 is connected. The water temperature detection thermistor 9 and the boiler temperature detection thermistor 10 are connected to the microcomputer board circuit 41. The microcomputer 42 has a built-in memory, and the memory stores program data for processing performed by the microcomputer 42, and 1 second based on a water temperature and a current value in heating the sheath heater 8a. The hot water supply amount data per hit is stored in the table. This table stores hot water supply amount data per second at each current value of 9A to 14.9A in 0.1A unit for each water temperature of 0C to 60C in 1C unit. . FIG. 5 shows a flow of hot water supply processing performed by the microcomputer 42.

First, the power switch 5a is turned on (O
N), and if the power switch 5a is not turned on, the second normally open contact 24 is turned off (stop) by the second exciting coil 33 via the power board circuit 31. It is in a standby state until the power switch 5a is turned on.

When the power switch 5a is turned on, the power lamp 5e is turned on (ON), and the hot water mode selected by operating or not operating the cup adjustment switch 5c (mode of the number of cups, that is, 4 cups, 6 cups,
..., 15 cups). Next, step 1 (S
As processing of T1), start / stop switch 5d
It is determined whether or not the start input operation is performed by.

When the start input operation is not performed by the start / stop switch 5d, the process returns to the first process of the hot water supply process again. When the start input operation is performed, the set hot water discharge is set. The hot water supply amount data is set from the mode (hot water supply amount setting means), the second exciting coil 33 is energized via the power supply substrate circuit 31, the second normally open contact 24 is turned on, and the boiler 8 is turned on.
The sheath heater 8a is turned on (boiler is turned on).

Next, it is determined whether or not the current value detected by the current sensor 35 is zero. If the detected current value is 0,
The process returns to the above-mentioned step 1 again,
If the detected current value is not 0, the warm-up time is calculated based on the temperature of the boiler 8 detected by the boiler temperature detection thermistor 10 at this time, and the standby state is set until the warm-up time elapses.

When this warm-up time has elapsed, it is next determined in step 2 (ST2) whether or not the current value detected by the current sensor 35 is zero. If the detected current value is not 0, it is determined in step 3 (ST3) whether or not the stop input operation is performed by the start / stop switch 5d.

When the stop input operation is performed by the start / stop switch 5d, the second exciting coil 33
Is stopped, the second normally open contact 24 is turned off (stop), and the process returns to the first process of this hot water supply process.

If the stop input operation is not performed by the start / stop switch 5d, the detection signals from the water temperature detection thermistor 9 and the current sensor 35 are checked, and based on the water temperature and the current value obtained from those detection signals. , The corresponding hot water supply amount data per second is read from the table stored in the built-in memory of the microcomputer 42, the hot water supply amount from the last check to the present check is calculated, and the calculated hot water supply amount is calculated. The total hot water supply amount at the time of this check is calculated by adding to the total hot water supply amount at the time of the previous check (hot water supply amount calculation means).

When the hot water supply amount is calculated, it is judged whether or not the hot water supply amount data is equal to or more than the set hot water output amount data. If the amount of hot water supply data is equal to or more than the amount of hot water supply amount data, the energization of the second exciting coil 33 is stopped and the second normally open contact 24 is turned off (stop). The process returns to the first process of this hot water supply process again (heating control means).

If the current value detected by the current sensor 35 is 0 in the process of step 2 described above, the calculated hot water supply amount data is stored in the internal memory as the process of step 4 (ST4). Hold it.

Next, it is determined whether or not the stop input operation is performed by the start / stop switch 5d. When the stop input operation is performed by the start / stop switch 5d, the second exciting coil 33 is energized,
The second normally open contact 24 is turned off (stopped), and the process returns to the first process of this hot water supply process.

If the stop input operation is not performed by the start / stop switch 5d, it is determined whether or not the current value detected by the current sensor 35 is zero. If the detected current value is 0, the process returns to the above-described step 4 again. If the detected current value is not 0, based on the temperature of the boiler 8 detected by the boiler temperature detection thermistor 10 at this time. Calculate the warm-up time,
It is in a standby state until the warm-up time elapses. When this warm-up time has elapsed, the process returns to the above-mentioned step S3.

In this embodiment having such a structure, first, the amount of water in the water tank 2 is set to a sufficient amount and set on the upper surface of the hot water supply portion 1a of the water heater body 1, and coffee powder is put therein. Place the drip container 3 containing the filter in the hot water outlet 1b
And the bottle 4 is placed on the upper surface of the bottle placing section 1c.

At this time, when the power switch 5a is pressed, the power lamp 5e lights up, and then the cup adjustment switch 5c.
Is pressed down a number of times according to the desired hot water supply amount to turn on the cup number display lamp 5g to turn on the lamp at the desired hot water supply amount position. Next, when the start / stop switch 5d is pressed, the hot water discharge lamp 5h lights up and hot water supply is started.

That is, according to the number of cups selected by the cup adjusting switch 5c, the amount of hot water discharged is set, the sheath heater 8a of the boiler 8 is energized, and the water in the boiler 8 is started to be heated.

As shown in FIG. 6, even if the heating of the water by the sheath heater 8a is started, the water does not boil immediately. Therefore, it is calculated based on the temperature of the boiler 8 detected by the boiler temperature detecting thermistor 10 at this time. It remains 0 until the warm-up time T1 has elapsed.

Eventually, when the warm-up time has elapsed (time A), the water in the boiler 8 boils, and the boiling pressure causes the boiling water to drop into the drip container 3 through the hot water supply pipe portion 6b of the hot water supply path 6. It

Thereafter, the detection signals from the water temperature detection thermistor 9 and the current sensor 35 are checked, and the hot water supply amount data per second at that time is read from the internal memory of the microcomputer 42, and the read hot water supply amount data per second. Based on the above, the hot water supply amount from the previous check time to the current check time is added to the total hot water supply amount calculated at the previous check time to calculate the total hot water supply amount at this time.

This total hot water supply amount data is compared with the set hot water discharge amount data, and when the total hot water supply amount data becomes equal to or higher than the hot water discharge amount data (time point B, in FIG. 6, 15 cups are discharged by the cup adjustment switch 5c). Is set), the energization of the sheath heater 8a of the boiler 8 is stopped and the hot water supply is stopped.

When the water in the water tank 2 is exhausted during hot water supply (time C), the expansion of the diaphragm 7a of the water pressure switch 7 is canceled and the micro switch 7b is turned off. Therefore, the energization of the sheathed heater is stopped. At this time, the current value detected by the current sensor 35 becomes 0, so that the total hot water supply amount data calculated at that time is held.

When the amount of water in the water tank 2 is set to a sufficient amount and the water tank 2 is reset on the upper surface of the hot water replenishing portion 1a, the diaphragm 7a of the water pressure switch 7 expands outward again to turn on the micro switch 7b. To do. Therefore, the energization of the sheath heater 8a is restarted. At this time, the current value detected by the current sensor 35 is not 0. Therefore, when the warm-up time T2 calculated based on the temperature of the boiler 8 detected by the boiler temperature detection thermistor 10 at this time has passed (time D), The total hot water supply amount is calculated by adding the hot water supply amount to the held total hot water supply amount.

The calculated total hot water supply amount data is compared with the set hot water discharge amount data, and when the total hot water supply amount data is equal to or more than the hot water discharge amount data, the energization of the sheath heater 8a of the boiler 8 is stopped. Hot water supply is stopped.

As described above, according to this embodiment, the water tank 2
A water temperature detecting thermistor 9 for detecting the temperature of the water supplied from the boiler 8 to the boiler 8 and a current sensor 35 for detecting the value of current supplied to the sheathed heater 8a for boiling the water in the boiler 8 are provided. It is possible to form a table in the built-in memory of the hot water supply amount data per second based on the water temperature and the current value in the heating of the sheath heater 8a, and calculate the total hot water supply amount at that time in real time. By comparing the hot water supply amount with the desired hot water discharge amount, and when the total hot water supply amount becomes equal to or more than the hot water discharge amount, the energization of the sheathed heater 8a is stopped to stop the hot water supply, whereby the temperature of the water in the water tank 2 is reduced. Fluctuations, variations in the heating characteristics of the sheathed heater 8a, and changes in the voltage (current) of the power supplied to the sheathed heater 8a. It can be obtained accurately the desired hot water quantity.

Furthermore, the water amount in the water tank 2 can be set to a sufficient amount first, and even if the water in the water tank 2 runs out during the hot water supply, the total hot water amount data at that time is retained, After replenishing the tank 2 with water, the boiler 8 detected by the boiler temperature detecting thermistor 10 at this time
Since the calculation of the total hot water supply amount data is started after the warm-up time calculated on the basis of the temperature has elapsed, the desired hot water supply amount can be accurately obtained also at this time. Therefore, it is possible to save the trouble of considering the amount of water stored in the water tank 2.

In this embodiment, the water temperature detected by the water temperature detection thermistor 9 and the current sensor 35.
The amount of hot water supplied was calculated by reading the amount of hot water supplied per second based on the current value detected by, but the present invention is not limited to this, and the amount of hot water supplied per second is based only on the water temperature. It is also possible to provide a table storing the hot water supply amount data of and to calculate the hot water supply amount only based on the water temperature detected by the water temperature detection thermistor 9.

[0050]

As described above in detail, according to the present invention,
The desired amount of hot water supply can be obtained accurately without being affected by the temperature of the water stored in the water tank or variations in the heating characteristics of the heating device, and the amount of water stored in the water tank must be taken into consideration. It is possible to provide a water heater that can omit the.

[Brief description of drawings]

FIG. 1 is a front view showing the configuration of a coffee brewer according to an embodiment of the present invention.

FIG. 2 is an enlarged view showing an operation / display panel of the embodiment.

FIG. 3 is a schematic cross-sectional view showing a configuration of a coffee brewer according to the embodiment.

FIG. 4 is a block diagram showing a circuit configuration of a main part of the embodiment.

FIG. 5 is a view showing a flow of hot water supply processing of the embodiment.

FIG. 6 is a diagram showing a graph of time against the number of cups during hot water supply according to the embodiment.

[Explanation of symbols]

2 ... Water tank, 4 ... Hot water storage tank, 5c ... Cup adjustment switch, 6 ... Hot water supply path, 7 ... Water pressure switch, 8 ... Boiler, 8a ... Sheath heater, 9 ... Water temperature detection thermistor, 1
0 ... Boiler temperature detecting thermistor, 35 ... Current sensor, 42 ... Microcomputer.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shigesuke Kuzumaki 2-7-5 Akasaka, Minato-ku, Tokyo Hirotomo Co., Ltd. (72) Inventor Yu Naya 1-1-1 Shibaura, Minato-ku, Tokyo Toshiba headquarters office

Claims (1)

[Claims] 1. A water tank for storing water, a heating means for heating the water supplied from the water tank according to the amount of electric current supplied thereto, a hot water container, and water supplied from the water tank to the heating means. A hot water supply path for supplying water to which the water is boiled by this heating means to the hot water container, a hot water supply amount setting means for setting a desired hot water supply quantity, and water supplied from the water tank to the heating means. A water temperature detecting means for detecting the temperature, a hot water supply amount calculating means for calculating the hot water supply amount supplied to the hot water supply container every predetermined time based on the water temperature detected by the water temperature detecting means, and the hot water supply amount calculating means A water heater comprising: heating control means for stopping the heating of water by the heating means when the amount of hot water supplied is equal to or more than the amount of hot water set by the hot water supply amount setting means.