JPH0532018Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a siphon-type coffee maker that can automatically end the coffee extraction operation.

(Prior Art) Conventionally, a siphon-type coffee maker that uses an alcohol lamp as a heating source for a flask has been widely known, but this type of coffee maker has had the problem of requiring troublesome operations and being difficult to use.

However, prior to the present invention, the applicant had devised a siphon-type coffee maker that was configured to automatically end the coffee extraction operation and was designed to improve operability. 3
As shown in the figure.

In Fig. 3, 1 is an AC power supply, 2 is a power switch, 3 is an electric heater which is a heating source for the flask,
4 is a heat-sensitive element (thermostat) that detects the dry state of the flask, 5 is an energization indicator lamp, and 6 is an overload protection device.The water in the flask is heated by the electric heater 3 and boils, causing the hot water to flow into the funnel. When the flask is pushed up and the flask becomes dry, the heat-sensitive element 4 detects this state and cuts off the electricity to the electric heater 3, and then when the temperature of the flask drops and the internal pressure drops, the coffee in the funnel is pulled back. It's summery.

(Problem to be solved by the invention) By the way, in the siphon-type coffee maker with the above structure, the time required for hot water to rise into the funnel, extract the coffee ingredients from the coffee grounds, and return to the flask is approximately constant. There is a problem in that the concentration of the coffee obtained is also approximately constant, and the concentration cannot be adjusted according to preference.

However, the present invention provides an automatic siphon-type coffee maker with a concentration adjustment function.

(Means for Solving the Problems) The content of the present invention will be explained below with reference to FIGS. 1 and 2, which correspond to embodiments.

An electric heater 3 is used as a heating source for the flask 12, and a heat-sensitive element 4 is provided to detect the dry state of the flask 12, and when the heat-sensitive element 4 detects the dry-burn state, the electricity to the electric heater 3 is stopped and the coffee is heated. In the siphon-type coffee maker that automatically ends the brewing operation, a circuit 7 is provided that stops supplying electricity to the electric heater 3 after a predetermined period of time has passed after the above-mentioned heat-sensitive element 4 detects dry brewing. The changeover switches 10 are inserted in series. In the illustrated embodiment, the circuit 7 is formed by a thermostat 8 and a heater 9 for heating it, but it may also be formed by using, for example, a CR time constant circuit, in short, it can achieve the intended purpose. Any circuit configuration that can achieve this will suffice.

(Function) With the above configuration, the time required for hot water to rise into the funnel and return to the flask is determined by the concentration changeover switch 10.
You can adjust the concentration of coffee according to your preference by turning it on or off.

(Example) Hereinafter, the example of the present invention shown in FIGS. 1 and 2 will be described in detail.

The circuit 7 consists of a series circuit of a thermostat 8 and a heater (positive temperature coefficient thermistor) 9 for heating the thermostat 8, and a manual concentration changeover switch 10 is connected in series. A series circuit of the circuit 7 and the concentration changeover switch 10 is connected to the heat sensitive element 4 in parallel.

The mounting stand 11 has an electric heater 3 having an annular hot plate structure.
The flask 12 is placed on the electric heater 3. Further, the mounting stand 11 houses a heat-sensitive element 4, an overload protection device 6, a thermostat 8, and a heater 9, which are in contact with the center of the outer bottom surface of the flask 12, and furthermore, a power switch 2 and a concentration changeover switch 10 are mounted with their knobs on the top surface. It will be set up in front of you.

The funnel 13 is composed of a funnel main body 14 having a pipe 15 hanging from the bottom thereof, and a funnel support body 17 whose upper end is in close contact with the funnel main body 14 through a packing 16. The pipe 15 is inserted into the opening of the flask 12 in an airtight manner through the pipe 15, and the tip of the pipe 15 is opened into the inner bottom of the flask 12 in the inserted state. The funnel support 17 is equipped with a pressure regulating valve 19 that is open at room temperature and closes when the internal atmospheric temperature reaches a predetermined temperature.
9 is composed of a shape memory alloy 20, a spring 21, a valve body 22, and the like. Also, the funnel support body 17
A cover 24 that covers the handle 23 and the outer end side of the pressure regulating valve 19 is integrally formed.

In the figure, 25 indicates a handle of the flask 12, and 26 indicates a filter.

In the above configuration, first, the flask 12 containing water is placed on the electric heater 3, then the funnel 13 containing coffee powder is inserted into the flask 12, and then the power switch 2 is turned on. At this time, if the user prefers a strong coffee, the concentration changeover switch 10 is turned on, and if he prefers a weak coffee, the concentration changeover switch 10 is turned off.

The temperature of the water in the flask 12 begins to rise due to heating by the electric heater 3, and eventually steam begins to be generated, but the internal pressure of the flask 12 does not rise immediately because the pressure regulating valve 19 is in an open state. The temperature of the water eventually rises to near boiling temperature, and a large amount of water vapor is generated, causing flask 1 to rise.
When the ambient temperature inside the pressure regulator 2 reaches a predetermined temperature, the pressure regulating valve 19 is closed. Then, the internal pressure of the flask 12 increases rapidly, and the hot water in the flask 12 is pushed up through the pipe 15 and the filter 26 into the funnel main body 14, and extracts coffee components by contact with the coffee powder.

Then, when the hot water in the flask 12 runs out and the flask 12 becomes dry-fired, the heat-sensitive element 4 senses the rapid temperature rise in the flask 12 and turns OFF. At this time,
When the concentration changeover switch 10 is in the OFF state, the power to the electric heater 3 is immediately cut off. Then,
The temperature of the flask 12 begins to decrease, and the internal pressure also decreases, and eventually the coffee in the funnel main body 14 is drawn back into the flask 12 through the filter 26, ending the coffee extraction operation.

When the concentration selector switch 10 is in the ON state,
The electric heater 3 is not immediately stopped energized by turning off the heat-sensitive element 4, but continues to be energized via the concentration changeover switch 10 and the circuit 7. On the other hand, the thermostat 8 begins to be heated by the heater 9, and when it is heated to the OFF temperature after a predetermined time elapses,
The OFF operation cuts off the power to the electric heater 3. After that, the same operation as in the previous case is performed, and the coffee extraction operation is completed.

As described above, when the concentration changeover switch 10 is turned on, the contact time with the coffee powder is increased by the time from when the heat-sensitive element 4 is turned off until the thermostat 8 is turned off, making it possible to obtain coffee with a strong concentration. .

In the above embodiment, the thermostat 8
By being able to adjust the OFF temperature, you can more precisely adjust the concentration of coffee.

(Effects of the invention) As described above, the siphon-type coffee maker of the present invention can improve operability by automatically ending the coffee extraction operation, making it easier to use, and making it easier to use. The concentration can also be adjusted according to preference, and is excellent for practical use.

[Brief explanation of the drawing]

Fig. 1 is an electrical circuit diagram of a siphon-type coffee maker according to an embodiment of the present invention, Fig. 2 is a vertical cross-sectional configuration diagram of the same coffee maker, and Fig. 3 is a siphon-type coffee maker devised by the applicant before the present invention. FIG. 3... Electric heater, 4... Heat sensitive element, 8... Thermostat, 9... Heater, 10... Concentration selection switch, 12... Flask.

Claims (1)

[Scope of utility model registration request] In addition to using an electric heater as a heating source for the flask, a heat-sensitive element is installed to detect the dry state of the flask, and when this heat-sensitive element detects the dry-burning state, power to the electric heater is stopped and the coffee extraction operation is automatically performed. The saifon is characterized in that a circuit is provided to prevent energization of the electric heater after a predetermined period of time has elapsed after dry firing is detected by the heat-sensitive element, and a manual concentration changeover switch is inserted in series with this circuit. style coffee maker.