JP2004121861A - Coffee maker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To cause a coffee finished temperature upon completion of feeding hot water to become such a temperature as one suitable for drinking by performing an additional boiling in an extraction configuration in which a heating electrical power of a heater is reduced so as to control a concentration of coffee liquid. <P>SOLUTION: A heating means 4 is electrically energized by a heating control means 8 under a duty control until a temperature of the heating means 4 attained by a temperature sensing means 5 reaches a first predetermined temperature so as to perform an extracting operation and subsequently the operation is changed over to a continuous electrical energization and perform an additional heating operation. <P>COPYRIGHT: (C)2004,JPO

Description

The present invention relates to a coffee boiler in which heating extraction and keeping heat of coffee liquid are performed by the same heating means.

FIG. 13 shows the temperature of the heating means 4 by the temperature detecting means 5 and the temperature and time of the coffee liquid in the thermal insulation container when the coffee liquid of 680 W of the conventional heater and 320 ml of 2 cups are extracted at the heater energization rate of 12/16 second. It is a graph which shows progress of. The conventional coffee brewer is the same as the coffee brewer of Embodiment 1 described later with reference to FIG. The configuration will be described. The water in the water container 1 that has flowed into the water pipe 3 is heated by the heater 4 a, pushed upward in the water pipe 3 by steam pressure at the time of boiling, and discharged to the extraction unit 2. Further, a heater for heating the heat retaining container 6 containing the coffee liquid extracted from the extraction unit 2 to maintain the temperature is shared with a heater 4a for extracting and heating water and sending it to the extraction unit 2. The temperature of the coffee liquid in the heat retaining container 6 is maintained by controlling the temperature by the temperature detecting means 5 attached to the heating means 4. In such a conventional coffee machine, in order to increase the concentration of the coffee liquid extracted into the heat retaining container 6, the coffee is usually slowly extracted over time. For that purpose, the heating power is reduced by energizing the heater 4a with duty control or phase control by the heating control means 8, and the interval of intermittent hot water supply from the water pipe 3 to the extraction unit 2 is extended. Thereafter, when all the water in the water container 1 is heated and discharged to the extraction unit 2, the temperature of the heating means 4 rises rapidly. When the temperature of the heating means rises to a temperature at which it is determined that the hot water supply has been completed, the heating control means 8 stops energizing the heater 4a.

In order to increase the concentration of the coffee liquid, such a conventional coffee boiler raises the temperature of the heating means to the temperature at the end of hot water supply, while reducing the heating power by heating the heater with duty control or the like. The rate of temperature rise is lower than the rate of temperature rise during continuous energization. Therefore, since the time from the start of the temperature rise of the heater to the hot water supply end temperature becomes longer, the amount of heat radiation from the heat retaining container 6 increases, and it becomes difficult to obtain the effect of reheating. When the temperature of the heating means 4 by the temperature detecting means 5 reaches the hot water supply end temperature and the power is turned off, the temperature of the coffee liquid is about 81.5 ° C., which is an appropriate temperature range for drinking when it is generally said that coffee is delicious. Below 82 ° C to 85 ° C.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems, and provides a coffee brewing device that can set the temperature at the end of hot water supply to an appropriate temperature in a configuration in which a heater is subjected to duty control energization or phase control energization to control coffee concentration. The purpose is to do.

In order to solve the above-mentioned conventional problems, the present invention provides a water container for storing water, an extraction unit for storing coffee powder and extracting coffee liquid, and connecting the water container to the water container. A water pipe leading to the extraction unit, a heat insulation container containing the coffee liquid extracted from the extraction unit, and a heating unit that heats water to supply hot water to the extraction unit, and heats the coffee liquid in the heat insulation container, Temperature detecting means for detecting the temperature of the heating means, and heating control means for changing the heating output of the heating means based on the detected temperature of the temperature detecting means, wherein the heating control means, the temperature of the heating means If the temperature detected by the temperature detecting means reaches a first predetermined temperature when the temperature starts to rise, the heating output of the heating means is increased at a predetermined timing thereafter, and reheating heating for heating the coffee liquid in the heat retaining container is performed. line It is obtained by way.

Thereby, since the heat retention container 6 is heated with the heating output larger than the heating output during the extraction, the time from the start of the temperature increase of the heater to the hot water supply end temperature can be shortened without lowering the rate of the temperature increase. Therefore, the amount of heat radiation from the heat retaining container 6 can be minimized, and the effect of reheating can be enhanced.

As described above, according to the present invention, in the configuration in which the concentration of the coffee liquid is controlled by changing the heating power of the heater, the reheating can be performed efficiently, and the temperature of the completed coffee at the end of hot water supply can be made appropriate. We can provide delicious coffee.

A first invention provides a water container for storing water, an extraction unit for storing coffee powder and extracting coffee liquid, and a water pipe connected to the water container and guiding water in the water container to the extraction unit. Detecting the temperature of the warming container containing the coffee liquid extracted from the extracting unit, heating means for heating water to supply hot water to the extracting unit, and heating the coffee liquid in the heat retaining container, and detecting the temperature of the heating means Temperature detecting means, and heating control means for changing the heating output of the heating means based on the detected temperature of the temperature detecting means, wherein the heating control means starts to increase the temperature of the heating means and the temperature detecting means If the detected temperature reaches the first predetermined temperature, the heating output of the heating means is increased at a predetermined timing thereafter, so that the reheating heating for heating the coffee liquid in the heat retaining container is performed. Lottery Takes a long time at a relatively low output to increase the extraction efficiency, and after the extraction, the insulated container is heated with a heating output larger than the heating output during the extraction, so that the rate of temperature rise can be reduced from the time of the extraction operation. The time from the start of the temperature rise of the heater to the end of the hot water supply can be shortened, minimizing the amount of heat released from the heat insulation container, increasing the effect of reheating, and adjusting the temperature of the coffee liquid to an appropriate temperature. Can provide delicious coffee.

Furthermore, it detects that there is no more water from the water container to the extraction unit via the water pipe, and determines the start timing of reheating based on the detected information, so that a stable reheating effect is obtained. As a result, the finished temperature of the coffee liquid can be stably adjusted to an appropriate temperature.

According to a second aspect of the present invention, there is provided a water container for storing water, an extraction unit for storing coffee powder and extracting coffee liquid, and a water pipe connected to the water container and guiding water in the water container to the extraction unit. Detecting the temperature of the warming container containing the coffee liquid extracted from the extracting unit, heating means for heating water to supply hot water to the extracting unit, and heating the coffee liquid in the heat retaining container, and detecting the temperature of the heating means Temperature detecting means, and heating control means for changing the heating output of the heating means based on the temperature detected by the temperature detecting means, wherein the rate of increase in the temperature detected by the temperature detecting means is a predetermined value. Exceeds, the heating output of the heating means is increased at a predetermined timing thereafter, and the reheating heating for heating the coffee liquid in the heat retaining container is started, thereby not depending on the absolute value of the water temperature of the water container. , Water container Since it is possible to accurately and quickly detect the loss of water guided to the extraction unit through the water pipe, the start timing of the reheating time is made more appropriate, and a more stable reheating effect can be obtained. Thus, the temperature of the finished coffee liquid can be more stably adjusted to an appropriate temperature.

In a third aspect of the present invention, in particular, the heating control means according to claim 1 or 2 is characterized in that the time from the start of energization to the heating means until the temperature detected by the temperature detecting means exceeds the first predetermined temperature is equal to the first time. Only when the time is shorter than the predetermined time, by performing the additional heating, the additional heating can be performed only when the amount of water put in the water container is small, and the completed temperature when the hot water supply end temperature is reached tends to be low. The reheating effect can be enhanced only when a small amount is extracted, and conversely, the reheating can be suppressed during a large amount extraction in which the completed temperature of the coffee liquid when the hot water supply end temperature reaches a relatively high temperature.

According to a fourth aspect of the present invention, in addition to the configuration according to any one of the first to third aspects, the fourth aspect further includes a finished temperature selecting means for selecting a finished temperature of the coffee liquid immediately after the end of the extraction, and the heating control means comprises By performing the reheating heating in accordance with the selection by the temperature selection means, the temperature of the finished coffee can be adjusted to an appropriate temperature according to the user's preference.

In the fifth invention, the heating control means according to claim 4 terminates the reheating heating when the temperature detected by the temperature detection means reaches the hot water supply end temperature, and the heating water supply means selects the hot water supply at each temperature selected by the completion temperature selection means. By changing the end temperature, it is possible to change the reheating time and the hot water supply end temperature by continuous energization, and to adjust the temperature of the finished coffee to a suitable temperature according to the user's preference over a wide range. Can be.

According to a sixth aspect of the present invention, in particular, the heating control means according to claim 4 or 5 displays the selected state of the completed temperature selecting means on a display element, so that the state selected by the user is stored. Since it is easy to determine even if it is not performed, it is possible to prevent a selection error.

In a seventh aspect, the heating control means according to any one of claims 1 to 6, terminates the reheating heating when the temperature detected by the temperature detection means reaches the hot water supply end temperature, and sets the temperature at the start of energization to the heating means. By controlling the correction of the hot water supply end temperature by the detection temperature of the detection means, the completed temperature of the coffee liquid is prevented from becoming too low or too high, and the completion of the coffee regardless of the ambient temperature. The temperature can be stabilized at a target appropriate temperature.

(Embodiment 1)
Embodiment 1 of the present invention will be described with reference to FIG. In FIG. 1, 1 is a water container, 2 is a paper filter-equipped extraction unit for putting coffee powder, 3 is connected at one end to the bottom of the water container 1, and the other end is located above the extraction unit 2. 4 is a heating means having a configuration in which a heater 4a having a rated power of 100 V-680 W is attached to a part of the water pipe 3; 5 is a temperature detecting means attached to the heating means 4; It is a heat retaining container for storing the coffee liquid thus obtained. The water in the water container 1 is introduced into the water pipe 3 via a check valve 7 installed at the bottom of the water container 1. Reference numeral 8 denotes a heating control unit that controls power supply to the heater 4a of the heating unit 4 based on the temperature detected by the temperature detection unit 5. In such a configuration, the hot and cold water heated by the heating means 4 pushes up the check valve 7 by the vapor pressure due to the boiling, thereby stopping the flowing water from the water container 1, while pushing up the inside of the water pipe 3 to raise the extraction unit 2. Is discharged. Thereafter, this operation is repeated until all the water in the water container 1 is discharged to the extraction unit 2. When all the water in the water container 1 is heated and discharged to the extraction unit 2, the temperature of the heating means 4 rises rapidly. When the temperature detected by the temperature detection unit 5 reaches 125 ° C., which is the hot water supply end temperature, the heating control unit 8 turns off the power supply to the heating unit 4. Thereafter, the coffee liquid in the heat retaining container 6 is kept warm.

The operation of the heating control means 8 in the coffee brewer configured as described above will be described with reference to the flowchart of FIG. When heating is started, the heating control means 8 energizes the heater 4a with a duty cycle of 12/16 seconds (step 1). Then, when the water in the water container 1 runs out and the temperature of the heating means 4 starts to rise and the temperature detected by the temperature detecting means 5 becomes 80 ° C. or more, which is the first predetermined temperature, the heater 4a is switched to continuous energization to perform heating. Continue (step 2). Thereafter, when the temperature detected by the temperature detecting means 5 becomes equal to or higher than 125 ° C., which is determined as the hot water supply end temperature, the energization is terminated (step 3).

FIG. 3 is a graph showing the temperature of the heating means 4 by the temperature detecting means 5, the temperature of the coffee liquid in the heat insulation container, and the lapse of time when the 320 ml of the coffee liquid is extracted in the first embodiment. The temperature of the coffee liquid when the energization is terminated at the hot water supply end temperature is 81.5 ° C. in the conventional example, and 83.0 ° C. in the first embodiment.

As described above, by switching to the continuous energization from the first predetermined temperature until reaching the hot water supply end temperature, even when the heating power is reduced so as to increase the extraction time in order to increase the coffee concentration, the power is increased during the reheating. In order to maximize the temperature, the finished temperature of the coffee liquid at the end of hot water supply can be set to an appropriate temperature range of 82 ° C. to 85 ° C., which is said to be delicious when drinking, without reducing the reheating effect.

In the present embodiment, the duty control is performed until the temperature detected by the temperature detecting means 5 reaches the first predetermined temperature, and after the temperature reaches the first predetermined temperature, continuous energization is switched. Even if the detected temperature reaches the first predetermined temperature, the same effect can be obtained by performing duty control and controlling the average heating output to increase.

In the present embodiment, the heating output is increased immediately after the temperature detected by the temperature detecting means 5 reaches the first predetermined temperature. However, the timing of increasing the heating output may be appropriately delayed according to the situation. Further, the change of the heating output may be phase control.

(Embodiment 2)
Embodiment 2 of the present invention will be described with reference to FIGS. In the present embodiment, the configuration is the same as that of the first embodiment except for the heating control means 8, and the description is omitted.

The difference from the first embodiment as shown in the flowchart of the heating control means in FIG. 4 is that the heater 4a is energized with a duty cycle of 12/16 second (step 1) and then switched to continuous energization (step 2). The judgment is that the temperature rise of the detected temperature is 1.7 ° C. or more per unit time. FIG. 5 shows the detected temperatures of the respective heating means 4 in the case where the water of about 20 ° C. is put into the water container 1 for heating and the case where the water of about 35 ° C. is put in and heated. The higher the temperature of the water put in the water container 1, the higher the stable temperature of the heating means 4 at the time of heating extraction. In such a case, if the switching timing to the continuous energization is set to a threshold value based on an absolute value as in the first embodiment, the timing for switching to the continuous energization varies even if the same amount of water is extracted. The reheating time varies depending on the temperature, and the temperature of the finished coffee liquid at the end of hot water supply changes.

In the present embodiment, the timing for switching to the continuous energization is substantially constant even when the temperature of the water to be charged into the water container 1 is changed by performing the condition determination for switching to the continuous energization based on the temperature rise rate determination of the detected temperature. In addition, the time for reheating by continuous energization is stabilized, and the temperature of the finished coffee liquid at the end of hot water supply can be stably set to an appropriate temperature range for drinking.

(Embodiment 3)
Third Embodiment A third embodiment of the present invention will be described with reference to FIGS. In the present embodiment, the configuration is the same as that of the first embodiment except for the heating control means 8, and the description is omitted.

As shown in the flow chart of the heating control means in FIG. 6, the difference from the first embodiment is that the time until the temperature detected by the temperature detecting means exceeds the first predetermined temperature is shorter than the first predetermined time. The control is to switch to the continuous energization until the temperature detected by the detecting means exceeds the first predetermined temperature and reaches the hot water supply end temperature.

FIG. 7 shows the detected temperatures of the heating means 4 when the water container 1 is heated by adding 320 ml of water at 20 ° C. and when the cup is heated by adding 680 ml of 5 cups and water at 20 ° C. The longer the amount of water to be put into the water container 1, the longer the time for heating and extracting water. Normally, if the time for heating and extracting water is long, the time for heating the coffee liquid already extracted in the heat retaining container 6 is also long, so that the coffee temperature before reheating and heating is increased. Assuming that the reheating time by continuous energization is the same time, the finished temperature is further increased, and the upper limit of the suitable temperature range of 82 ° C. to 85 ° C. for drinking is reached. Therefore, in the present embodiment, the first predetermined time is set to 5 minutes so that the reheating by continuous energization is performed when the temperature of the completed coffee liquid at the end of hot water supply is less than or equal to 320 ml, which is relatively low. You have set. As a result, the finished temperature of the coffee liquid can be set to about 83.0 ° C., which is the center of the appropriate temperature range of 82 ° C. to 85 ° C. at the time of drinking at both 2 cups and 5 cups.

(Embodiment 4)
Embodiment 4 of the present invention will be described with reference to FIGS. In the present embodiment, description of the same configuration as that of the first embodiment will be omitted. In FIG. 8, reference numeral 9 denotes a completed temperature selecting means for selecting whether the temperature of the completed coffee liquid at the end of hot water supply is high or low.

The operation of the heating control means 8 in the coffee brewer configured as described above will be described with reference to the flowchart of FIG. First, high temperature or low temperature is selected by the completed temperature selecting means (step 1). When heating is started, the heating control means 8 energizes the heater 4a with a duty cycle of 12/16 seconds (step 2). Then, when the water in the water container 1 runs out and the temperature of the heating means 4 starts to rise and the temperature detected by the temperature detecting means 5 becomes 80 ° C. or more, which is the first predetermined temperature, if the completion temperature selection is high, The heater 4a is switched to continuous energization to continue heating (step 3a). If the completion temperature selection is low, the heater 4a is continuously energized at a cycle of 12/16 seconds (step 3b). Thereafter, when the temperature detected by the temperature detecting means 5 becomes equal to or higher than 125 ° C., which is determined as the hot water supply ending temperature, the energization is terminated (step 4). As described above, when the selection by the completed temperature selection unit is instructed, the continuous energization is switched until the temperature detected by the temperature detection unit exceeds the first predetermined temperature and reaches the hot water supply end temperature, and the coffee in the heat insulation container is switched. With the additional heating of the liquid, the temperature of the finished coffee can be changed according to the user's preference.

(Embodiment 5)
Embodiment 5 of the present invention will be described with reference to FIG. In the present embodiment, the configuration is the same as that of the fourth embodiment except for the heating control means 8, and the description is omitted.

FIG. 10 is a graph showing the relationship between the temperature of the heating means 4 by the temperature detecting means 5 and the hot water supply ending temperature of each selected temperature when extracting 320 ml of coffee liquid in the fourth embodiment. In the present embodiment, the finished temperature selection means can select three stages of low temperature, medium temperature, and high temperature. In each case, the completed temperature of the coffee liquid is 82 ° C. when the low temperature is selected and 83 ° C. when the medium temperature is selected. ° C and 85 ° C when high temperature is selected. In FIG. 10, the values of the hot water supply end temperature at the time of each selection are 115 ° C. when the low temperature is selected, 125 ° C. when the medium temperature is selected, and 135 ° C. when the high temperature is selected. In this way, by changing the hot water supply end temperature for each selected temperature of the completed temperature selection means, the heating time by continuous energization and the heating temperature at the end of the hot water supply can be changed, and according to the user's preference. The temperature at which the coffee is made can be varied over a wide range.

(Embodiment 6)
Embodiment 6 of the present invention will be described with reference to FIG. In the present embodiment, the configuration is the same as that of the fourth embodiment except for the heating control means 8, and the description is omitted. Reference numeral 10 denotes a display unit using a light emitting diode. The finished temperature selection means 9 has three options of high temperature, medium temperature, and low temperature, and the display means 10 displays the selected temperature by the heating control means 8. This makes it possible to easily determine even if the state selected by the user is not stored, so that a selection error can be prevented.

(Embodiment 7)
Embodiment 7 of the present invention will be described with reference to FIG. In the present embodiment, the configuration is the same as that of the first embodiment except for the heating control means 8, and the description is omitted. FIG. 12 is a correction value table of the hot water supply end temperature based on the temperature detected by the temperature detecting means 5 at the start of heating. The standard is an ambient temperature of 20 ° C., when the temperature range is 15 ° C. to 25 ° C. in the temperature range 3, with the setting of 125 ° C. without correction, the finished temperature of the coffee liquid in 2 cups of 320 ml is aimed at 83 ° C. For example, if the detected temperature at the start of heating is 10 ° C., since it is region 2, the hot water supply ending temperature is set to 130.5 ° C. by adding a correction value of + 5.5 ° C. to the initial value of 125 ° C. The actual measurement values with and without correction in each area are almost as intended as shown in FIG. Here, the temperature of 35 ° C. or more in the region 5 is uniformly set to −6.5 ° C. However, when the coffee brewing machine is continuously used, the heating means 4 is not sufficiently cooled, and the detected temperature at the start of heating is 100 ° C. C. or higher, and the correction will not work. This embodiment has an effect when the temperature of the heating means 4 is the same as the ambient temperature. If a dedicated temperature detecting means for faithfully detecting the ambient temperature is provided, the correction can function reliably. Become.

補正 By correcting the hot water supply end temperature in this way, it is possible to prevent fluctuations in the temperature of the coffee liquid at the time of completion due to the ambient temperature, and to stabilize the target temperature.

As described above, the coffee boiler according to the present invention performs reheating efficiently and can set the temperature of the completed coffee at the end of hot water supply to an appropriate temperature, so that the heating extraction and the heat retention of the coffee liquid are performed by the same heating means, The present invention can be applied to a coffee boiler or the like for controlling the coffee concentration.

(A) Configuration diagram of coffee brewer in Embodiment 1 of the present invention (b) Same electric circuit diagram Flow chart of heating control means in Embodiment 1 of the present invention Temperature graph of heating means and coffee liquid in Embodiment 1 of the present invention Flow chart of heating control means in Embodiment 2 of the present invention Temperature graph of heating means and coffee liquid according to Embodiment 2 of the present invention Flowchart of heating control means in Embodiment 3 of the present invention Temperature graph of heating means and coffee liquid in Embodiment 3 of the present invention (A) Configuration diagram of coffee brewer in Embodiment 4 of the present invention (b) Same electric circuit diagram Temperature graph of heating means and coffee liquid in Embodiment 4 of the present invention Temperature graph of heating means and coffee liquid in Embodiment 5 of the present invention (A) Configuration diagram of coffee brewer in Embodiment 6 of the present invention (b) Same electric circuit diagram FIG. 17 is a diagram showing a correction value table of a hot water supply end temperature according to Embodiment 7 of the present invention. Temperature graph of heating means and coffee liquid in conventional example

Explanation of reference numerals

DESCRIPTION OF SYMBOLS 1 Water container 2 Extraction part 3 Water pipe 4 Heating means 4a Heater 5 Temperature detecting means 6 Insulating vessel 8 Heating control means 9 Finished temperature selecting means 10 Display means

Claims (7)

A water container for storing water, an extraction unit for storing coffee powder and extracting coffee liquid, a water pipe connected to the water container and guiding water in the water container to the extraction unit, and an extraction unit for extracting water from the extraction unit. A heat retaining container containing the coffee liquid, heating the water to supply hot water to the extraction unit, heating means for heating the coffee liquid in the heat retaining container, and a temperature detecting means for detecting the temperature of the heating means, Heating control means for changing the heating output of the heating means based on the temperature detected by the temperature detection means, wherein the heating control means starts to increase the temperature of the heating means and the temperature detected by the temperature detection means becomes first. A coffee boiler for increasing the heating output of the heating means at a predetermined timing thereafter, and performing reheating heating for heating the coffee liquid in the heat retaining container. A water container for storing water, an extraction unit for storing coffee powder and extracting coffee liquid, a water pipe connected to the water container and guiding water in the water container to the extraction unit, and an extraction unit for extracting water from the extraction unit. A heat retaining container containing the coffee liquid, heating the water to supply hot water to the extraction unit, heating means for heating the coffee liquid in the heat retaining container, and a temperature detecting means for detecting the temperature of the heating means, Heating control means for changing the heating output of the heating means based on the detected temperature of the temperature detecting means, the heating control means, when the rate of increase of the temperature detected by the temperature detecting means exceeds a predetermined value, A coffee boiler that increases the heating output of the heating means at a predetermined timing and starts reheating by heating the coffee liquid in the heat retaining container. The heating control means performs reheating heating only when the time from the start of energization to the heating means until the temperature detected by the temperature detecting means exceeds the first predetermined temperature is shorter than the first predetermined time. Or the coffee brewer according to 2. 4. The apparatus according to claim 1, further comprising a finished temperature selecting means for selecting a finished temperature of the coffee liquid immediately after the completion of the extraction, wherein the heating control means performs reheating heating according to the selection by the finished temperature selecting means. A coffee stove according to claim 1. 5. The heating control means according to claim 4, wherein when the temperature detected by the temperature detection means reaches the hot water supply end temperature, the reheating heating is terminated, and the hot water supply end temperature is changed for each selection temperature of the completion temperature selection means. Coffee kettle. 6. The coffee brewing apparatus according to claim 4, wherein the heating control means displays the selected state of the finished temperature selecting means on a display element. The heating control means ends the reheating heating when the temperature detected by the temperature detection means reaches the hot water supply end temperature, and corrects the hot water supply end temperature by the temperature detected by the temperature detection means at the start of energization to the heating means. The coffee brewer according to any one of claims 1 to 6, which is controlled to be added.

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