JPH05111435A - Coffee brewer - Google Patents

Abstract

PURPOSE:To extract coffee of good taste even in the can coffee is extracted continuously by providing a suitable temperature lamp which is turned on by an output of a temperature sensor, when a hot water temperature in a hot water supply tank becomes a suitable temperature for extracting coffee, after a necessary time set by a timer elapses. CONSTITUTION:The coffee brewer is prodded with a heater for heating hot water contained in a hot water supply tank, a suitable temperature thermostat 11a for detecting a fact that hot water heated thereby becomes a coffee extracting temperature, a timer 2 which can set arbitrarily a time required for extracting coffee, and a suitable temperature lamp 5 which is turned on by an output of the suitable temperature thermostat 11a, when a hot water temperature in the hot water supply tank becomes a suitable temperature for extracting coffee, after the necessary time set by the timer 2 elapses. According to such a constitution, the time required for extracting coffee of the timer 2, which is set arbitrarily can be extended, and even if it is detected that the suitable temperature thermostat 11a becomes a suitable temperature, a hot water temperature in the hot water supply tank can be raised by extending a heating time of hot water by the heater without turning on immediately the suitable temperature lamp 3.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a coffee brewer for extracting coffee.

[0002]

2. Description of the Related Art Conventionally, in a coffee brewer for extracting coffee, hot water stored in a hot water supply tank is usually poured into coffee powder by utilizing a siphon phenomenon to extract coffee. In such a coffee brewer, when the temperature of the hot water in the hot water supply tank for extracting the coffee reaches the coffee extraction optimum temperature (usually 84 degrees), the optimum temperature lamp is turned on, and it is possible to extract the coffee. Inform.

After that, when the brewing switch for brewing the coffee is pushed, a suitable temperature of hot water is poured into the coffee powder from the hot water tank due to the siphon phenomenon, and the coffee with good taste is brewed. It should be noted that when the extraction switch is pressed, the timer operates, and after a certain time has elapsed, water is newly supplied to the hot water supply tank and the hot water in the hot water supply tank is heated by the heater for the next coffee extraction. ..

When the temperature of the hot water in the hot water supply tank reaches the proper temperature, the proper temperature lamp is turned on again to notify that the coffee having the proper temperature can be extracted. Here, the preparation for the next coffee extraction is performed after a certain time has elapsed using the timer, not when the coffee extraction is completed, because it is possible to accurately know the end time of the siphon phenomenon of coffee extraction. This is because it is difficult and it is unclear when the extraction of coffee will end.

For this reason, for example, in a coffee brewer estimated to complete coffee extraction within about 2 minutes and 30 seconds, a timer is provided to prepare for coffee extraction 2 minutes and 30 seconds after the extraction switch is pressed. It is set.

[0006]

However, in such a conventional coffee brewer, when extracting coffee, water is put in the hot water tank to cause a siphon phenomenon, so that the hot water temperature in the hot water tank drops. To do. Normally, the hot water is heated by the heater before the next coffee extraction, so the hot water temperature in the hot water supply tank is maintained at the set temperature above the appropriate temperature (usually 90 to 93 degrees), but coffee is continuously fed. When the water is extracted, the hot water temperature gradually drops.

The hot water temperature may drop to around 84 degrees. Even in this case, since the hot water temperature is 84 degrees or more, the appropriate temperature lamp is turned on, but when the coffee is brewed in this state, the hot water of 84 degrees or more is poured into the coffee powder at first, but eventually 84 Hot water below the temperature may be poured into the coffee grounds, and it may not be possible to extract good-tasting coffee.

As described above, in the case of continuously extracting coffee, there is a problem in that the coffee with good taste cannot be extracted even if the proper temperature lamp is turned on because the heating time cannot be sufficiently taken. In addition, especially when using coffee brewers for a long period of time or using water containing a large amount of Ca,
There is a problem in that it takes more time to heat the water because the scale adheres to the heater and the heat conduction capacity of the heater is reduced.

An object of the present invention is to provide a coffee brewer capable of extracting tasty coffee even when coffee is continuously extracted.

[0010]

The present invention is directed to a heater for heating hot water in a hot water supply tank, a temperature sensor for detecting that the hot water heated by the heater has reached an optimum temperature for coffee extraction, and a required coffee extraction. A timer configured to be able to arbitrarily set the time, and an appropriate temperature lamp that is turned on by the output of the temperature sensor when the hot water temperature in the hot water supply tank reaches the coffee extraction appropriate temperature after the required time set by the timer has elapsed It is equipped with and.

[0011]

With this configuration, it is possible to extend the time required for coffee extraction by an arbitrarily set timer, and even if the optimum temperature thermostat detects that the hot water temperature has reached the optimum temperature, the optimum temperature lamp is turned on immediately. Instead, the hot water temperature in the hot water supply tank can be increased by extending the heating time of the hot water by the heater.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view of a coffee brewer according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view of its main part. Figure 1
In the figure, 1a is a power switch, 1b is a coffee extraction switch, 2 is a timer capable of changing a set time, and 3 is an appropriate temperature lamp for notifying that the temperature of hot water has reached an appropriate temperature.

In FIG. 2, reference numeral 4 is a water supply valve for supplying water to the cistern tank 5, and 6 is an extraction valve for supplying water from the cistern tank 5 to the hot water storage tank 7. Reference numeral 8 is a tank tank float switch that controls the water level of the tank 5 by repeating the operation of closing the water valve 4 when the tank 5 is full and opening the water valve 4 when the water level drops.

9a closes the extraction valve 6 when the water level in the hot water storage tank 7 reaches the sensing level SW1,
When the water level of the hot water storage tank 7 reaches the sensing level SW2, the first tank water level sensor 9b that finishes supplying water to the tank forms a siphon in the extraction pipe described later, and therefore the extraction valve 6 is closed about 3 to 4 seconds after that. It is a second tank water level sensor that finishes supplying water to the hot water storage tank 7. The timer 2 starts at the same time as the extraction valve 6 is closed.

Reference numeral 10 denotes a tank heater for heating the hot water in the hot water storage tank 7, 11a detects the temperature of the wall surface of the hot water storage tank 7, and the appropriate temperature lamp 3 is turned on when the hot water temperature in the hot water storage tank 7 becomes the optimum extraction temperature. An appropriate temperature thermostat 11b is a hot water thermostat for controlling the energization of the tank heater 10 in order to keep the hot water in the hot water storage tank 7 at a set temperature, and 11c is an overheat protection thermostat for detecting emptying.

Here, the optimum temperature thermostat 11a and the timer 2 and the optimum temperature lamp 3 are the optimum temperature thermostat 11a after the set time of the timer 3 has elapsed as shown in FIG.
Temperature lamp 3 when the water temperature is detected to be appropriate
Is turned on, and the lighting timing of the proper temperature lamp 3 is changed by changing the set time of the timer 3.

Reference numeral 12 is an extraction pipe for pouring hot water in the hot water storage tank 7 into coffee powder (not shown) through the sprinkler plate 13 provided at the tip by utilizing the siphon phenomenon, and 12a changes the end point of the siphon phenomenon. It is a hot water amount adjusting pipe that adjusts the amount of hot water poured into the coffee powder.

Next, the heating operation of the coffee brewer thus constructed will be described.

When the power switch 1a of the coffee brewer is turned on in order to extract coffee, the water supply valve 4 and the extraction valve 6 are opened, and the hot water tank 7 is passed through the sister tank 5.
The water level L1 in the hot water storage tank 7 rises.

At this time, the water level L2 of the cistern tank 5 is controlled by the cistern tank float switch 7, and when the cistern tank 5 is full, the water supply valve 4 is closed,
If the water level L2 drops, the operation of opening the water supply valve 4 is repeated. Since the extraction valve 6 is maintained in the open state, water supply to the hot water storage tank 7 is continued.

When water supply to the hot water storage tank 7 is continued and the water level L1 in the hot water storage tank 7 reaches the detection level SW1 of the first tank water level sensor 9a, the first tank water level sensor 9a.
Detects the water level L1, closes the extraction valve 6 and completes the water supply to the hot water storage tank 7. At the same time, the tank heater 10 is energized to raise the temperature of the hot water and enter the extraction preparation state. The water supply valve 4 is closed as soon as the tank 5 is full.

After that, when the appropriate temperature thermostat 11a senses that the hot water temperature of the hot water storage tank 7 has risen to the appropriate extraction temperature, the appropriate temperature lamp 3 is turned on to display that the extraction is possible. This state is maintained until the coffee extraction switch 1b is pressed. The hot water is heated to the set temperature by the tank heater 10 even after the appropriate temperature lamp 3 is turned on.

Next, when the coffee brewing switch 1b is pressed, the brewing valve 6 is opened, the water in the tank 5 is supplied to the hot water storage tank 7, and the water level L1 of the hot water in the hot water storage tank 7 rises. When the water level L1 reaches the sensing level SW2 of the second tank water level sensor 9b, the second tank water level sensor 9
b detects the water level L1, and after about 3 to 4 seconds after that, the extraction valve 6 is closed, and the water supply to the hot water storage tank 7 is completed.

The hot water reaches the uppermost portion of the extraction pipe 12 in about 3 to 4 seconds, a siphon is formed in the extraction pipe 12, and even if the extraction valve 6 is closed by this siphon phenomenon, the hot water in the hot water storage tank 7 is Coffee powder (not shown) is sprayed from the water spray plate 13 via the extraction pipe 12. The timer 2 is turned on at the same time when the extraction valve 6 is closed.

Thereafter, as the water sprinkling is continued, the water level L1 of the hot water storage tank 7 is lowered as shown in FIG.
When 1 goes down to the tip of the hot water amount adjusting pipe 12a, air enters from the front end of the hot water amount adjusting pipe 12a, the siphon phenomenon disappears, and the sprinkling ends. Even if extraction is completed,
The extraction valve 6 remains closed until the timer setting time elapses.

Eventually, when the time set by the timer elapses, the extraction valve 6 opens, the water in the tank 5 is supplied to the hot water storage tank 7, and the water level L1 of the hot water in the hot water storage tank 7 rises. When the water level L1 in the hot water storage tank 7 reaches the sensing level SW1 of the first tank water level sensor 9a, the first tank water level sensor 9a senses the water level L1 and closes the extraction valve 6 to finish supplying water to the hot water storage tank 7. To do. At the same time, the tank heater 10 is energized to start increasing the temperature of the hot water, and the appropriate temperature lamp 3
Lights up to inform you that you are ready to extract again.

After that, when coffee is continuously extracted, the temperature of the hot water in the hot water storage tank 7 gradually decreases, and eventually to near 84 degrees. However, even in such a state, the temperature of the hot water exceeds 84 degrees, so that the appropriate temperature lamp 3 is turned on when the timer setting time elapses. At this time, when coffee is extracted, hot water at 84 degrees or higher is poured at first, but hot water at 84 degrees or lower may be poured in time.

In this case, the timer 2 is manually operated to extend the set time. As a result, the time for starting preparation of coffee extraction is extended, and therefore, even if the hot water temperature exceeds 84 ° C., the set temperature of the timer 2 is extended and the optimum temperature lamp 3 is added.
Does not light. Therefore, the coffee brewing switch 1b is not pressed and the hot water is heated for a long time, and the hot water temperature greatly exceeds 84 degrees.

As described above, in the case of continuously extracting coffee, when the extracted hot water temperature becomes lower than the optimum temperature, the set time of the timer is extended to extend the energization time of the tank heater 10 and raise the hot water temperature. In addition, even if coffee is not continuously extracted, if it is used for a long period of time or if water containing a large amount of Ca is used, the scale adheres to the heater and the heat conduction capacity of the heater decreases, so heating I need to extend the time. Even in this case, it is possible to extend the energization time of the tank heater 10 and raise the hot water temperature to an appropriate temperature by manually extending the timer setting time.

As a result of the experiment, when the heat conduction capacity of the heater is reduced by 20%, the timer setting time is extended by about 1 minute, and when it is reduced by 40%, it is extended by about 2 minutes, so that an appropriate temperature of hot water can be obtained. A coffee with good taste can be extracted.

As described above, by varying the set time of the timer controlling the coffee extraction interval, the extraction interval is lengthened and the hot water heating time is lengthened, so that an appropriate temperature of hot water is always added to the coffee powder. Can be poured into.

[0033]

As described above, according to the present invention, it is possible to extend the time required for coffee extraction by the timer set arbitrarily, and by this, the optimum temperature thermostat detects that the hot water temperature becomes the optimum temperature. The temperature of the hot water in the hot water supply tank can be raised by extending the heating time of the hot water by the heater without immediately turning on the appropriate temperature lamp. By doing so, it is possible to extract good-tasting coffee even when coffee is continuously extracted.

[Brief description of drawings]

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

FIG. 2 is a sectional view of a main part of the coffee brewer.

FIG. 3 is a diagram showing a relationship among a timer, a proper temperature thermostat, and a proper temperature lamp of the coffee brewer.

FIG. 4 is a diagram showing a change in water level of the coffee brewer.

[Explanation of symbols]

 2 Timer 3 Optimum temperature lamp 7 Hot water storage tank 10 Tank heater

Claims (1)

[Claims] 1. A heater for heating hot water in a hot water supply tank,
A temperature sensor that detects that the hot water heated by this heater has reached the optimum temperature for coffee extraction, a timer configured so that the time required for coffee extraction can be set arbitrarily, and the time required set by this timer has elapsed. After that, the coffee brewer is provided with an appropriate temperature lamp that is turned on by the output of the temperature sensor when the hot water temperature in the hot water supply tank reaches the coffee extraction optimum temperature.