JPH041856Y2 - - Google Patents

Description

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

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

However, before devising 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, and the electrical circuit of the siphon-type coffee maker was designed to improve operability. 4
As shown in the figure.

In Fig. 4, 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 an over-temperature 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 decreases in temperature, and finally reaches 80 -
It is kept warm at around 85℃.

(Problems to be Solved by the Invention) By the way, the above circuit configuration has the following problems in practical use. For example, when brewing coffee for a large number of people, it cannot be done in one use and must be used continuously, but if the thermo switch 55's return temperature is set to a low temperature, Thermo switch 55 is ON
It is inconvenient to have to wait for a long time, and conversely, if the temperature is set higher than the keep warm temperature, if the funnel is left in the flask after brewing coffee, the thermostat will not work. The problem was that the switch would turn on and the water boiling operation would start again.

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

(Means for solving the problem) In order to solve the above problem, the present invention provides
A first relay has a relay switch that switches between an NO contact that is turned on and an NC contact that is turned on when not energized, and a second relay that has a relay switch that is turned OFF when energized.
The contacts are connected to one terminal of the power supply through the heater, the NC contacts are connected to one terminal of the power supply through a series circuit consisting of a heat retention control circuit and a heater, and a parallel circuit with the coil of the second relay, and the coil of the first relay is connected to one terminal of the power supply. The relay switch of the second relay and the automatic reset type thermoswitch are connected in series to one terminal of the power supply.

(Function) The above circuit configuration allows the thermoswitch to
When turned OFF, the relay switch of the first relay is turned OFF.
Switches to NC contact, energizes the coil of the second relay and turns the relay switch OFF, so when the thermoswitch turns on due to the drop in temperature at the bottom of the flask, the coil of the first relay is not energized. The relay switch is on the NC contact side.
It stays on and does not resume boiling water. Therefore, the temperature at which the thermo switch returns to ON can be set to a high temperature, increasing convenience during continuous use, and even if the funnel is left in the flask after brewing coffee, the water boiling operation will not work. There is no problem of restarting.

(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 heat plate 4 with a heater 3 embedded integrally on the heat shield plate 2 is installed. 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 forms the spout 8 of the flask 5.
It is also used by

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 body 12 has a cylindrical portion 16 positioned on the outer periphery of the pipe 11 with an appropriate gap formed integrally on its 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 roller 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, and 27 is an energization indicator lamp.

Next, in the electric circuit shown in FIG. 1, 32 is a transfer type first relay, 33 is a break contact type second relay, 34 is an automatic reset type thermoswitch with a built-in heat sensitive device, and 35 is an AC power supply. , 1st
After connecting the switching piece of the relay switch 32a of the relay 32 to one terminal of the power supply 35 via the main switch 26, and inserting the NC contact into a heat retention control circuit consisting of a diode 28 and a heat retention thermoswitch 29, It is connected to the other terminal of the power supply 35 through the heater 3 along with the NO contact, and further the coil 3
One end of 2b is connected to a terminal of a power source 35 through a main switch 26, and the other end is connected to a terminal of a power source 35 through a relay switch 33a of a second relay 33, a thermoswitch 34, a resistor 36, and a diode 37, respectively. A coil 33b of the second relay 33 has one end connected to an NC contact and the other end connected between a thermoswitch 34 and a resistor 36, and a CR delay circuit 38 is connected in parallel to this coil 33b. In FIG. 1, 27 is a power indicator lamp, 39 is a capacitor, and 40 is an overtemperature rise prevention device.

In the above circuit, the first and second relays 32 and 33 are driven by direct current, but this is because when driven by alternating current, the timing of the operation of the two relays does not match well. This is because the rate of chattering phenomenon increases, and
The operation of the second relay 33 is delayed by several tens of milliseconds by the CR delay circuit 38, thereby stabilizing the operation.

The operation of the above configuration will be explained with reference to FIG. Note that the temperature change shown in FIG. 3 is a change in the temperature of the hot water in the flask, and does not indicate a change in the temperature sensed by the thermoswitch.

Now, connect the funnel 9 containing coffee powder 31 to the flask 5 containing water 30, and
After placing the on the hot plate 4, turn on the main switch 26.
Then, since both the thermo switch 34 and the relay switch 33a are in the ON state, the coil 32b switches the relay switch 32a from the NC contact to the NO contact, and full-wave current is applied to the heater 3. Then, the water 30 in the flask 5 is heated by the heater 3 and begins to rise in temperature, and soon steam begins to be generated, but since the pressure regulating valve 21 in the flask 5 is open and is being released into the atmosphere, There will be no pressure increase. The temperature of the water eventually rises to near the boiling temperature, a large amount of water vapor is generated actively, and when the atmospheric temperature within the flask 5 reaches a predetermined temperature, the pressure regulating valve 21 is closed. Then, since the inside of the flask 5 becomes sealed, the pressure increases rapidly, and the hot water inside the flask 5 is pushed up through the pipe 11 and the filter 14 due to the pressure, and comes into contact with the coffee powder, thereby effectively extracting the taste and aroma. do.

As a result, the hot water in the flask 5 decreases and the temperature of the thermoswitch 34 reaches the OFF temperature, and the thermoswitch 34 turns OFF and turns off the coil 32b.
Stop energizing. Then, relay switch 3
2a switches from the NO contact to the NC contact, and a heat retention control circuit is inserted in series with the coater 3. However, at this point, the heat retention thermo switch 29 is
Since it is in the OFF state, the heater 3 is in a non-energized state. On the other hand, the second relay 33 is connected to the CR delay circuit 3
8, the relay switch 33a operates with a delay of several tens of milliseconds from the ON of the NC contact, and turns the relay switch 33a into the OFF state.

After the heating by the heater 3 is stopped, the temperature inside the flask 5 starts to decrease over time and the internal pressure decreases, and the inside of the flask 5 becomes a negative pressure state, and the coffee liquid in the funnel 9 is pulled back through the filter 14 and the pipe 11 and stored therein.

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. Coffee remaining in the eyelid flask 5 can be removed by placing the flask 5 on the hot plate 4 and turning on the thermoswitch 29.
Depending on whether it is ON or OFF, the temperature will be kept at 80-85℃.

Furthermore, if the coffee is not drunk immediately after brewing, and the funnel 9 is left in the flask 5, the temperature at the bottom of the flask 5 will drop, and the thermoswitch 34 will eventually reach the ON return temperature and turn ON. Since the relay switch 33a is in the OFF state, the coil 32b of the first relay 32 is not energized, and the relay switch 32a maintains the NC contact ON state, and the water boiling operation is performed by full-wave energization to the heater 3. There isn't. Furthermore, flask 5
If the internal temperature drops, the heat retention thermo switch 2
The coffee in the flask 5 is kept warm at 80 to 85° C. by controlling the amount of electricity supplied to the heater 3 by turning on and off the heater 9 and half-wave energization by the diode 28. At this time, since the pressure regulating valve 21 is closed, it goes without saying that heat retention control is performed so that the coffee in the flask 5 does not rise into the funnel 9.

(Effects of the invention) As described above, according to the configuration of the invention, it is possible to set the ON return temperature of the thermoswitch to a high temperature to increase convenience during continuous use, and moreover, the funnel can be inserted into the flask after coffee extraction. This is excellent in practical use because it does not cause the problem that the coffee extraction operation is performed again even if the coffee is left as it is.

[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 view showing the same structure, Fig. 3 is an explanatory diagram of the same operation, and Fig. 4 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... Heater, 5... Flask, 28... Diode, 29... Heat retention thermoswitch, 32...
...First relay, 33...Second relay, 34...
...Automatic return type thermoswitch.

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, this thermoswitch switches from boiling water to warming operation by the 0FF operation, and has an NO contact that turns on when energized and an NC contact that turns on when not energized. A first relay has a relay switch that switches between
and a second relay having a relay switch that turns OFF, the NO contact of the first relay is connected to the heater, and the NC contact is connected to the heat retention control circuit and the series circuit of the heater in parallel with the coil of the second relay. The coil of the first relay is connected to one terminal of the power source through a circuit, and the coil of the first relay is connected to one terminal of the power source through the relay switch and automatic reset type thermoswitch of the second relay in series. A saifon style coffee maker.