JPH0380010B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (A) Field of Industrial Application The present invention relates to a coffee extraction device that extracts hot water using the siphon effect.

(B) Prior Art Conventionally, this type of coffee brewing device completes one brewing cycle when siphoning is stopped at the suction port of the siphon pipe connected to the hot water tank. Therefore, for the next extraction, it was necessary to supply water from the level of the suction port of the siphon tube to the level at which the siphon phenomenon started, and there was a long loss time from the extraction command until hot water actually came out of the siphon tube.

(c) Purpose of the Invention The purpose of the present invention is to reduce the loss time from the extraction command to the extraction of hot water, and to quickly perform the extraction operation.

(D) Structure of the Invention The present invention is a coffee brewing device that extracts hot water using the siphon effect, and after the siphon is stopped at the level of the suction port of the siphon tube,
The structure is such that water for next extraction is supplied above the suction port of the siphon tube.

(e) Embodiment FIG. 1 shows the internal structure of the coffee brewing device of the present invention, in which a water storage tank 2 with an open top is disposed in the upper part of the main body 1, and a heater 3, A hot water tank 6 is provided with a hot water temperature control thermostat 4 for controlling energization of the heater 3, and a suitable temperature thermostat 5 mounted on the upper outer wall surface. One end of the water storage tank 2 is connected to a water supply, and the other end of a water supply pipe 8 equipped with a water supply valve 7 is exposed in the middle, and a water extraction valve 9 is interposed between the lower part of the water storage tank 2 and the bottom of the hot water tank 6. Extraction pipe 10
are connected in communication by. Further, connected to the upper part of the hot water tank 6 is a siphon pipe 11 having a suction port 11A located at the upper part of the hot water tank 6 and a spray head 12 attached to the other end located below the suction port 11A.

The water storage tank 2 is provided with a first water level detection device 13 that controls the water supply valve 7 to maintain the water level of the tank 2 at a predetermined level. A float system is adopted in which a reed switch 13B, which will be described later, is opened and closed based on the ups and downs of the reed switch 13B. The hot water tank 6 also includes a cylindrical pipe 1 whose upper end protrudes above the top of the siphon pipe 11 and whose lower end extends below the tank 6.
4 is connected to the cylindrical pipe 14, and a second water level detection device 15 for detecting the water level in the hot water tank 6 and controlling the water extraction valve 9 is disposed in the cylindrical pipe 14. This water level detecting device 15 has the same structure as the first water level detecting device 13, but has two upper and lower reed switches that control the opening and closing of an upper reed switch 15B and a lower reed switch 15C, which will be described later, based on the ups and downs of the float 15A. The upper level is set to a level at which the siphon phenomenon by the siphon tube 11 reliably starts, and the lower level is set below the upper level and above the suction port 11A of the siphon tube 11. .

Furthermore, as another configuration, a chamber 17 in which coffee powder 16 is set is provided oppositely below the spray head 12 and can be freely pulled out.
An extraction switch 18 is attached to the upper front of the main body 1, and a power switch 19 is attached to the lower front. In addition, a filter 20 and an opening/closing lid 21 are disposed opposite to each other above the water storage tank 2.
Allows manual water supply. Furthermore, hot water tank 6
A reference numeral 22 erected at a predetermined position of the water storage tank 2 is an overflow pipe for venting air from the hot water tank 6 and for the water storage tank 2 . 23 is a manual drain valve for draining hot water from the hot water tank 6.

Next, the electric circuit of the present invention will be explained based on FIG. 19 is the power switch, 18 is the automatic return type extraction switch, 4 is the hot water temperature control thermostat, 5 is the appropriate temperature thermostat, and 24 indicates that the water temperature in the hot water tank 6 is at an appropriate temperature for extraction. 7 is the water supply valve; 9 is the water extraction valve; 3 is the heater; 1
3B is a reed switch included in the first water level detection device 13, 15B and 15C are upper and lower reed switches included in the second water level detection device 15, and 25 is a reed switch included in the first water level detection device 13. This is a full water lamp that lights up when a predetermined water level in the tank 2 is detected. 26 is the first relay, which has a normally open first relay contact 26A and a normally closed first relay contact 26A.
It has a relay contact 26B. A magnetic relay 27 has normally open magnetic switches 27A and 27B at both ends of the heater 3. 28 is a second relay, which has a normally open second relay contact 28A, a normally closed second relay contact 28B, and a self-holding contact 28.
It has C. A third relay 29 has a normally closed third relay contact 29A. 30 is the 4th relay,
It has a normally open fourth relay contact 30A, a normally closed fourth relay contact 30B, and a self-holding contact 30C. 3
1 is a timer that starts when the second water level detection device 15 detects the upper level;
It has a timer contact 31A that opens when the time for ensuring the completion of the extraction operation has elapsed.

Next, the operation of the present invention based on the above configuration will be explained. First, when the power switch 19 is closed, the lower reed switch 15C is closed, so the first
The relay 26 is energized and its contact switches to the normally open first relay contact 26A, and since the reed switch 13B is open at this time, the third relay 29 is de-energized and switches to the normally closed third relay contact 29A. is in a closed circuit state. Therefore, the water supply valve 7 and the water extraction valve 9 are opened to supply water from the water supply pipe 8 to the water storage tank 2, and further from the water storage tank 2 to the hot water supply tank 6 via the water extraction pipe 10. At this time, since the flow of water from the water storage tank 2 to the hot water tank 6 is a natural fall, the amount of water supplied to the water storage tank 2 increases, and as the water flows to the hot water tank 6, the water level in the water storage tank 2 rises. .

When the water level in the water storage tank 2 reaches a predetermined water level, the first water level detection device 13 detects this and closes the reed switch 13B.
The relay 29 is energized and the third relay contact 29 is normally closed.
Open circuit A. Therefore, the water supply valve 7 is temporarily closed, but since the water extraction valve 9 is open, the water storage tank 2
The water level decreases, and the water supply valve 7 is opened again to de-energize the third relay 29 and close the normally open third relay contact 29A by opening the reed switch 13B again. When water is supplied to the lower level of the hot water tank 6 by repeating such water supply operation, the second
The water level detection device 15 detects this and opens the lower reed switch 15C. Then, the first relay 26 is de-energized and its contact switches to the normally closed first relay contact 26B, which closes the water supply valve 7 and water extraction valve 9 and stops the water supply to the water storage tank 2 and hot water tank 6. .

On the other hand, the magnetic relay 27 is energized via the normally open first relay contact 26B, and the magnetic switches 27A and 27B are closed to energize the heater 3 and drain the water stored in the hot water tank 6. Heat. The control thermostat 4 controls the energization of the heater 3, and when the appropriate temperature thermostat 5 senses a temperature suitable for extraction, the thermostat 5 operates to turn on the appropriate temperature lamp 24.
lights up to notify you that hot water extraction is possible.

In this state, when the extraction switch 18 is pressed, the second relay 28 is energized and its contacts are connected to the normally open second relay 28.
While switching to the relay contact 28A, the second relay 28 is self-held via the self-holding contact 28C even when the extraction switch 18 is reset. As a result, the water extraction valve 9 opens and the water in the water storage tank 2 is released from the water extraction pipe 10.
During this time, the water supply valve 7 is opened and closed as appropriate based on the first water level detection device 13 to maintain the water level in the water storage tank 2 at a predetermined level.

Then, when the level of hot water in the hot water tank 6 rises and reaches the upper level, the siphon phenomenon starts.
The hot water in the hot water supply tank 6 passes through the siphon pipe 11 and is sprayed from the spray head 12 onto the coffee powder 16 in the chamber 17 to extract coffee liquid. On the other hand, the fourth reed switch 15B closes at the timing when the siphon phenomenon starts.
While the relay 30 is energized and switches its contact to the normally open contact 30A, the fourth relay 30 is self-held via the self-holding contact 30C. As a result, the water extraction valve 9 closes, stopping the water supply from the water storage tank 2 to the hot water tank 6, and simultaneously starts the timer 31. This timer 31 keeps the second relay 28 and the fourth relay 30 in an energized state so that the water extraction valve 9 does not open while hot water is being extracted from the siphon pipe 11 by the siphon effect.

As hot water is extracted from the siphon pipe 11, the level of hot water in the hot water tank 6 gradually decreases, and the lower reed switch 15C becomes closed midway through the process. Furthermore, the suction port 11 of the siphon tube 11
When the level of hot water becomes lower than A, air flows in from the suction port 11A, interrupting the siphon phenomenon and ending the extraction of hot water.

When the operation of extracting hot water from the siphon pipe 11 in the hot water tank 6 is completed in this way, the timer 3
1 times up and the timer contact 31A opens, thereby releasing the self-holding of the second relay 28 and switching its contact to the normally closed second relay contact 28B, while opening the self-holding contact 28C. At the same time, the self-holding of the fourth relay 30 is released and its contact is switched to the normally closed fourth relay contact 30B, and the self-holding contact 30C is opened. By switching the contacts of the fourth relay 30, the power to the timer 31 is cut off, and the timer contacts 31A are normally closed. When the timer contact 31A closes, at this time, the level of hot water in the hot water tank 6 is lower than the lower level.
Since it is at the level of , the lower lead switch 15
C is closed. Therefore, the first relay 26 is energized and its contact is switched to the normally open first relay contact 26A, which opens the water supply valve 7 and water extraction valve 9 to supply water from the water supply pipe 8 to the water storage tank 2, and further to the water storage tank. 2
From there, water is supplied to the hot water tank 6 via a water extraction pipe 10. When the water level in the hot water tank 6 rises to the lower level, the lower reed switch 15C is opened, the first relay 26 is deenergized, and its contact is switched to the normally closed first relay contact 26B, ending all operations. do.

As described above, if the extraction operation is performed from the lower level to the upper level, the time from when the extraction switch 18 is pressed to when the siphon phenomenon starts can be shortened. Note that the lower level takes into account the increase in amount when the water in the hot water tank 6 is heated from room temperature and expands, and the closer it is to the upper level, the shorter the time from when the extraction switch 18 is pressed until the hot water extraction starts. be done. Further, in the present invention, water is supplied from the water storage tank 2 to the hot water supply tank 6, but it is also possible to implement the invention by omitting the water storage tank 2 and the water supply valve 7 and connecting the water extraction valve 9 directly to the water supply.

(F) Effects of the Invention In the present invention, after the hot water extraction operation using the siphon tube is surely completed, water is supplied to the hot water tank for the next cycle of extraction operation, so hot water extraction is started from the extraction command. The loss time required for extraction is significantly reduced, and extraction operations can be carried out quickly. In addition, for users, it can alleviate the anxiety of not being able to extract boiling water even after pressing the brew switch.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing the internal structure of the coffee brewing apparatus of the present invention, and FIG. 2 is an electric circuit diagram of the present invention. 6...Hot water tank, 9...Water extraction valve, 11...Siphon pipe, 15...Second water level detection device, 15
B... Upper reed switch, 15C... Lower reed switch, 31... Timer, 31A... Timer contact.

Claims (1)

[Claims] 1. In a coffee brewing device that uses the siphon effect to extract hot water in a hot water supply tank heated by a heating device from a siphon pipe connected to the tank, the water extraction valve is opened based on the operation of a hot water supply switch, and the hot water is supplied. an extraction circuit that supplies water to a tank to induce a siphon phenomenon and closes a water extraction valve when the siphon starts; a timer circuit that controls the water extraction valve to close until the siphon finishes extracting hot water; and the timer. A coffee brewing device comprising a water supply circuit that opens the water extraction valve based on a time-up of the circuit and closes the extraction valve when water is supplied to a level above the suction port of the siphon pipe.