JPH0425070Y2 - - Google Patents

Description

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

(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. 5
As shown in the figure.

In Fig. 5, 51 is an AC power supply, 52 is a main switch, 53 is a water heater that heats the flask, 54 is a heat-retaining heater, and 55 is an automatic return type thermoswitch that turns on and off according to changes in the bottom temperature of the flask. , 56 is an energization indicator lamp, and 57 is a temperature over-rise prevention device. When the main switch 52 is turned on, the water in the flask is heated by the water heater 53 and the heat-retaining heater 54 to boil, and the increase in internal pressure causes the boiling water to boil. When the flask is pushed up into the funnel and becomes dry, the thermoswitch 55 is activated.
The OFF operation cuts off the power to the water heater 53,
Switch from boiling water to keeping warm. Thereafter, as the temperature inside the flask decreases and the internal pressure decreases, the flask draws back the coffee liquid in the funnel and collects it. Then, the temperature of the coffee liquid stored in the flask does not drop rapidly due to the heat of the insulating heater 54, but gradually drops to 80 to 85% within the time (about 15 minutes) when coffee is ready for drinking after extraction. It is kept at or above ℃.

(Problem to be solved by the invention) By the way, in the above circuit configuration, when the temperature at the bottom of the flask drops to the ON temperature of the thermoswitch and the thermoswitch turns ON, the water heater is re-energized. For this reason, if the flask is left with the funnel inserted in it after coffee extraction, the water boiling operation (coffee extraction operation) will have to be performed again, resulting in a bad taste of the coffee.

The present invention provides a siphon-type coffee maker that solves the above problems.

(Means for Solving the Problems) In order to solve the above problems, the present invention is equipped with an automatic reset type thermoswitch that turns on and off according to changes in the temperature of the flask.
In a saifon-type coffee maker that switches from the hot water heater to the warming heater when the water is turned OFF, by thermally linking the warming heater to the thermoswitch mentioned above, the thermoswitch is forcibly maintained in the OFF state by the heat of the warming heater when the thermoswitch is kept warm. It is something to do.

(Function) With the above configuration, the thermoswitch will
When the thermoswitch is turned off and energized to the heater, the thermoswitch receives heat from the heater and is kept above the ON return temperature regardless of the drop in the bottom temperature of the flask, thus maintaining the OFF state. Therefore,
The thermoswitch returns to the ON state and does not re-energize the water heater, and the coffee extraction operation will not be repeated if the funnel is left in the flask after coffee extraction.

(Embodiment) The embodiment of the present invention shown in FIGS. 1 to 3 will be described in detail below.

First, in FIG. 2, the stand 1 has a heat shield plate 2 installed therein, and a hot plate 4 with a water heater 3 embedded therein is installed on the heat shield plate 2. The flask 5 has a spout 6 formed at a suitable position on its upper end, and is provided with a handle 7 made of synthetic resin at a position opposite to the spout 6.
This handle 7 forms one engagement receiving part 8 of a pair of engagement receiving parts provided on the flask 5 side at the fixed end, and the other engagement receiving part is connected to the spout 6 of the flask 5. It is used for both purposes.

The funnel 9 is composed of a funnel main body 10 made of glass and having a pipe 11 suspended from the bottom thereof, and a funnel support body 12 made of synthetic resin that is integrally fixed to the outer periphery of the bottom of the funnel main body 10 via a packing 13. ing. The funnel main body 10 has a filter 1 at the inner bottom
Coffee grounds are stored on the filter 14, and the upper opening thereof is closed by a lid 15. The funnel support 12 has a cylindrical portion 16 positioned at an appropriate distance from the outer periphery of the pipe 11, which is integrally molded on the inner surface.
Attach Patsukin 17 to 6. Further, the funnel support body 12 has an inward engaging protrusion 18 and an outward engaging protrusion 19 integrally molded at the lower end. Then, the funnel 9 is inserted into the opening of the flask 5 with a seal 1.
7 is pressed and compressed and rotated relative to the flask 5, the engagement protrusion 18 is engaged with the lower side of the spout 6, and the engagement protrusion 19 is engaged with the engagement receiving part 8. is held by the elastic force of the packing 17. In this state, the gasket 17 reliably seals the space between the flask 5 and the funnel 9.

The funnel support 12 is integrally formed with a handle 20 at a position opposite to the handle 7 of the flask 5, and is provided with a pressure regulating valve 21 at a position covered by the handle 20. This pressure regulating valve 21 is composed of a shape memory alloy 22, a spring 23, and a valve body 24, and is in an open state at room temperature to open the inside of the flask 5 to the atmosphere.
It closes when the atmospheric temperature within the flask 5 reaches a predetermined temperature.

In FIG. 2, 25 is a heat sensitive device for sensing the bottom temperature of the flask 5, 26 is a main switch, 27 is an energization indicator lamp, 28 is a relay, and 29 is a cover for the heat sensitive device 25.

Next, the structure of the heat-sensitive device 25 will be explained according to FIG. 1. The heat-sensitive device 25 has a ceiling wall in contact with the outer bottom surface of the flask 5 as a heat-sensing portion 33, and a plurality of protrusions 34 on the open lower edge. Formed thermal case 3
2, a pair of thermal conductors 35 made of metal with good thermal conductivity and formed into an inverted L-shape and housed in the thermal case 32 with their backs to each other and having their upper surfaces in contact with the inner surface of the thermal part 33; A cylindrical presser 36 that is fixed in the heat-sensitive case 32 by bending the protrusion 34 and presses the heat conductor 35 against the inner surface of the heat-sensitive part 33 as it is fixed, and an automatic return type attached to the lower end of the heat conductor 35. A thermoswitch 37 is used as the thermoswitch 37, for example, a temperature-sensitive reed switch.

Further, in the heat-sensitive device 25, the outer diameter of the presser 36 is made sufficiently smaller than the inner diameter of the heat-sensitive case 32, and a heat-retaining heater 38 is installed between the two. This insulating heater 38 is not intended to maintain the temperature of the coffee liquid in the flask 5 at a high temperature, but rather to slow down the temperature drop of the coffee liquid and keep the temperature of the coffee liquid within 80 minutes (approximately 15 minutes) before the coffee is ready for drinking after extraction. The purpose is to maintain the temperature at ~85℃ or higher. In the figure, 39 indicates a core material of the heat-retaining heater 38.

Next, in the electric circuit of FIG. 3, relay 28
connects the switching valve 28a to one terminal of the AC power supply 40 via the main switch 26, and
The contact is connected to the other terminal of the power source 40 through the water heater 3, and the NC contact is connected through the heat-retaining heater 38 and diode 41 in series. The coil 28b of the relay 28 forms a series circuit with the thermo switch 37, and is connected to the power source 4 via the main switch 26.
Connect between both terminals of 0. In the figure, 27 is an energization indicator lamp, and 42 is an overtemperature rise prevention device.

In the above configuration, when the flask 5 containing water 30 is connected to the funnel 9 containing coffee powder 31 and the flask 5 is placed on the hot plate 4, when the main switch 26 is turned on, the coil 28b is turned on by the thermoswitch. Since switch 37 is in the ON state, switch switch 28a is
Switch from NC contact to NO contact, water heater 3
energize. Then, the water 30 in the flask 5 is heated by the water heater 3 and its temperature begins to rise.
Steam eventually begins to be generated, but the pressure inside the flask 5 does not rise immediately because the pressure regulating valve 21 is open and exposed to the atmosphere. When the temperature of the water eventually rises to near boiling temperature and a large amount of steam is generated, and the atmospheric temperature inside the flask 5 reaches a predetermined temperature, the pressure regulating valve 21
is occluded. Then, the inside of the flask 5 becomes sealed, so the pressure increases rapidly, and the pressure pushes the hot water inside the flask 5 through the pipe 11 and the filter 14, bringing it into contact with the coffee powder, effectively extracting the taste and aroma. do.

When the amount of hot water in the flask 5 decreases and the temperature at its bottom reaches the OFF temperature of the thermoswitch 37, the thermoswitch 37 turns OFF and stops energizing the coil 28b. Then, the switching valve 28a switches from the NO contact to the NC contact, stopping the supply of electricity to the kettle heater 3 and supplying electricity to the warming heater 38.

As the heating by the water heater 3 stops, the temperature inside the flask 5 begins to decrease and the internal pressure decreases.
The flask 5 becomes under negative pressure, and the coffee liquid in the funnel 9 is drawn back through the filter 14 and the pipe 11 and stored therein. The temperature of the coffee liquid in the flask 5 is gradually lowered by the heat of the insulating heater 38.
The temperature will be maintained at 80-85℃ or higher during the drinking time (about 15 minutes after extraction).

After brewing the coffee, hold the handles 7 and 20 and rotate the flask 5 and funnel 9 relative to each other to remove the engaging protrusion 1.
By disengaging the funnel 9 from the flask 5, the funnel 9 can be pulled out from the flask 5, and the coffee liquid in the flask 5 can be poured into a coffee cup or the like.

Furthermore, if the funnel 9 is left in the flask 5 without drinking the coffee immediately after brewing, the temperature of the coffee liquid in the flask 5 will gradually drop, but the thermoswitch 37 will turn on the heater 38. By receiving heat through the heat sensitive case 32 and the heat conductor 35, it is maintained above the ON return temperature, and the OFF state is maintained.
maintain the condition. Therefore, the switching valve 28a maintains the NC contact side ON state, and the water heater 3 is not energized again.

Incidentally, FIG. 4 shows an electric circuit in another embodiment of the present invention, in which a DC type relay is used as the relay 28. Therefore, even with this circuit configuration, the same operation as the circuit configuration shown in FIG. 3 can be performed. In the figure, 43 is a resistor, 44 is a capacitor, 45
indicates a diode.

(Effect of the invention) As described above, in the siphon-type coffee maker of the invention, the thermoswitch is kept in the OFF state by the heat retention heater, so the water heater is not energized again after coffee is brewed (during heat retention). Even if the funnel is left in the flask and left unattended, the coffee extraction operation does not occur again, which is excellent in practical use.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing the main structure of a siphon-type coffee maker according to an embodiment of the present invention;
The figure is a vertical cross-sectional view showing the overall structure, Figure 3 is an electric circuit diagram, Figure 4 is an electric circuit diagram of a siphon-type coffee maker according to another embodiment of the present invention, and Figure 5 is a diagram of the invention developed by the present applicant. This is an electrical circuit diagram of the siphon-type coffee maker that I devised earlier. 3... Water heater, 5... Flask, 28...
...Relay, 37...Automatic reset type thermoswitch,
38... Warmth heater.

Claims (1)

[Scope of utility model registration request] Equipped with an automatic return type thermoswitch that turns ON and OFF according to temperature changes in the flask, and switches from a water heater to a heat retention heater when the thermoswitch turns OFF, when the heat retention heater is kept warm, the heat of the heat retention heater is A saifon-type coffee maker characterized in that the thermoswitch is thermally disposed on the insulating heater so as to maintain the OFF state of the thermoswitch.