JPH0455052B2 - - Google Patents

Description

[Detailed description of the invention] Industrial applications The present invention relates to a coffee brewer.

BACKGROUND ART Conventionally, there has been known a coffee boiler in which a mill mechanism for grinding coffee beans and a dripping mechanism are integrated, and the operation is automatically switched to the dripping operation after grinding the coffee beans.

That is, as shown in FIGS. 2 and 3, the coffee boiler has a container 1 that integrates a coffee bean grinding chamber and a filtration chamber that extracts coffee liquid and separates the extracted liquid and residue. The container 1 is equipped with a cutter 3 that is rotationally driven by a motor 2, and is equipped with a filter 4 at the bottom that separates the extract from the residue. Further, it is provided with a timer 7 that automatically switches from energizing the motor 2 to energizing the heater 6 after the operation is completed, and a switch 8 that starts energizing the motor 2.

In the above configuration, when the timer 7 is set to the "mill" position and power is started by the switch 8, the coffee beans are ground by the cutter 3, and then the drip function is automatically performed.
That is, the water contained in the tank 9 flows through the check valve 10.
The hot water is introduced into a water pipe 11 formed integrally with the heater 6 through the heater 6, and when the water is heated by the heater 6, the steam pressure generated pushes up the hot water and positions it above the container 1. Discharge pipe 1
1', and from this discharge pipe 11', the container 1
Hot water is poured inside to extract the coffee liquid,
Coffee liquid is contained in a glass container 12. Furthermore, when the timer 7 is set to the "drip" position and the switch 8 is operated, only the above-described drip function is performed.

Figure 4 shows the specific circuit diagram.
13 is a thermostat, and this thermostat 1
3 is its own operating temperature (hereinafter referred to as "adjustment temperature")
) and the temperature it receives (hereinafter referred to as "measured temperature").In other words, if the measured temperature is lower than the adjusted temperature, the heater 6 is turned on, and if it is higher, the heater 6 is turned off.
It is something to do. It should be noted that the circuit diagram inside the box ○a is the circuit diagram during the drip operation.

Problems to be Solved by the Invention When making a large amount of coffee continuously, once the dripping is finished, the extracted coffee liquid is transferred to another container, and then the same procedure is repeated with fresh coffee beans and water. However, when we investigate the actual usage in this case, we often forget to fill the tank 9 with water when repeating such operations.

In such a state, in order to perform the drip operation, when the timer 7 is set to the "drip" position and the switch 8 is operated, the heater 6 is energized and heated, resulting in a so-called dry firing state. As a result, various parts within the main body were heated abnormally, causing their shapes to deform and becoming a major cause of failure. In other words, the temperature change of the water in the tank 9 during the drip operation is as shown in FIG. The temperature gradually rises (heating).
When the boiling temperature is reached, steam is generated, and the steam pressure pushes the hot water up into the discharge pipe 11'.
The coffee is extracted according to the instructions. While coffee continues to be extracted by supplying hot water from the discharge pipe 11', the temperature is maintained at approximately boiling temperature. Then, when the supply of hot water from the discharge pipe 11' is almost completed and the hot water is in a dripping state, the temperature rises again due to heating from the heater 6, and when a predetermined temperature is reached, the heater is turned off (extraction).

In other words, when the dripping operation is finished, the temperature is above the boiling temperature, and if you forget to add water to the tank 9 and repeat the dripping operation, the heater 6 will be energized and the temperature will become dry. However, when such dry firing is performed, there are problems in that it not only wastes power, but also causes significant deterioration of each component, leading to failure.

The object of the present invention is to provide a coffee boiler that solves these problems.

Means for Solving the Problems In order to solve the above problems, the coffee boiler of the present invention includes a tank provided in the main body and containing water, a water pipe for guiding the water in the tank, and a water pipe for directing the water. A heater for heating, a temperature sensing element for detecting the temperature in the vicinity of the heater, a heater energization control means for controlling energization of the heater, a drip mechanism for supplying hot water to coffee powder and extracting coffee liquid, and starting dripping. The output temperature of the temperature sensing element is compared with the output temperature of the drip start temperature setting means, and the output temperature of the temperature sensing element is lower than the output temperature of the drip start temperature setting means. and a comparison means for outputting a prohibition signal for heater energization to the heater energization control means if the temperature is higher.

Effect According to the above configuration, if the temperature detected by the temperature sensing element is higher than the temperature set by the drip start temperature setting means (this is taken as the predetermined temperature in FIG. 5) at the time of starting dripping, the heater is Since no current is applied, it is possible to prevent dry firing during repeated use.

Embodiment Hereinafter, an embodiment of the present invention will be described based on the block diagram shown in FIG. In FIG. 1, parts that perform the same operations as in FIGS. 2 to 4 are given the same numbers, and their explanations are omitted here.

In FIG. 1, reference numeral 14 denotes a temperature sensing element that detects the temperature near the heater 6, and is installed at the position shown in FIG. 15 is a heater energization control means for controlling the energization of the heater 6; 16 is a drip start temperature setting means for permitting energization of the heater 6 at the start of dripping and setting the maximum temperature; the output of the drip start temperature setting means 16; and the output of the temperature sensing element 14 are both input to the comparison means 17, and a signal determined by the comparison means 17 and indicating whether or not to energize the heater 6 is inputted to the heater energization control means 15. 18 is a notification device such as a buzzer or a lamp.

In the above configuration, the timer 7 is set to "drip".
When the drip operation is started by connecting the drip to the position shown in FIG. Find out if it is expensive. As a result, if the detected temperature is lower than the set temperature, the heater 6 is energized;
If this is not the case, the heater 6 is not energized because dry firing will occur, and an abnormality (dry firing) is notified by the annunciator 18. Further, in the above embodiment, the operations of the drip start temperature setting means 16 and the comparison means 17 are programmed by the microprocessor 19.

The drip operation may be started at the above-mentioned "drip" position and only the drip operation is performed, or the drip operation may be performed after the mill operation is completed. Further, in the above embodiment, a coffee boiler equipped with a mill mechanism has been described, but it goes without saying that the present invention can also be applied to a coffee boiler without a mill mechanism.

Effects of the Invention As described above, according to the present invention, if the temperature detected by the temperature sensing element is higher than the temperature set by the drip start temperature setting means at the time of starting dripping, the heater is not energized. As a result, it is possible to prevent dry firing during repeated use, thereby eliminating wasted power consumption due to dry heating, and also preventing failures due to abnormal heating of various parts. Extremely excellent effects can be obtained with a simple configuration.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a coffee brewer showing an embodiment of the present invention, FIG. 2 is a front view of a conventional coffee brewer, FIG. 3 is a vertical sectional view of the same coffee brewer, and FIG. The figure is a circuit diagram of the same coffee boiler, and FIG. 5 is a temperature characteristic curve diagram during dripping. 5...Body, 6...Heater, 9...Tank, 1
DESCRIPTION OF SYMBOLS 1... Water tube, 14... Temperature sensing element, 15... Heater energization control means, 16... Drip start temperature setting means, 17... Comparison means, 18... Alarm, 19...
...Microprocessor.

Claims (1)

[Claims] 1. A tank provided in the main body and containing water, a water pipe guiding the water in the tank, a heater that heats the water, and a temperature sensing element that detects the temperature near the heater. , a heater energization control means for controlling energization of the heater, a drip mechanism for supplying hot water to coffee powder and extracting coffee liquid, a drip start temperature setting means for setting a temperature at the time of starting dripping, and a drip start temperature setting means for setting a temperature at the time of starting dripping; The output temperature is compared with the output temperature of the drip start temperature setting means, and if the output temperature of the temperature sensing element is higher than the output temperature of the drip start temperature setting means, a comparison signal is output to the heater energization control means to prohibit heater energization. A coffee boiler configured by means. 2. A patent claim that is provided with an alarm that notifies that the dripping operation will not be performed if the temperature detected by the temperature sensing element at the time of starting dripping is higher than the temperature preset by the dripping start temperature setting means. The coffee brewer according to item 1.