JPS59113847A - Apparatus for extraction of coffee - Google Patents

Abstract

PURPOSE:To shorten the time for heating, boiling, cooling, etc. for the extraction of coffee, and to improve the operating efficiency, by circulating a slurry of water and powdery coffee between an extraction column and a heating device. CONSTITUTION:The extraction apparatus is composed of the extraction column 1 having the part 2 for supplying coffee powder and the part 4 for delivering extracted coffee liquid at the top of the column and a part 1' for the discharge of liquid at the bottom of the column, and the circulation line having a feed pump 7, the heater 9, the water supply part 14 and the liquid pipes 6, 8, 10, etc. The circulation line is connected with the extract delivery part 4 and the liquid discharging part 1'. A slurry obtained by mixing water with coffee powder is circulated between the extraction column 1 and the heater 9. The time for the heating of the liquid, and the boiling and cooling, etc. of the liquid for extracting coffee extract can be shortened to about half of the time required in the conventional coffee extraction apparatus. Accordingly, the operating efficiency can be improved, and the heat consumption can be decreased.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a coffee extraction device for extracting coffee extract from coffee powder to obtain coffee liquid.

More specifically, roasted coffee powder is supplied together with water to an extraction tower, made into a slurry in the tower, and the slurry is converted into an extraction tower using a circulation circuit equipped with a liquid sending pump, a heater, etc. installed in the extraction tower. This invention relates to a coffee extraction device that circulates the flow of a heater to extract coffee extract and obtain coffee liquid in a short time.

Generally, when producing coffee liquid for canning, roasted coffee powder and water are supplied to an extraction tower, and the slurry of coffee powder and water supplied into the tower is heated by a heating device installed on the wall of the extraction tower. Extracts coffee extract. However, with a heating device installed on the wall of the extraction tower that heats the slurry inside the tower, it takes an extremely long time to heat the entire slurry to a predetermined temperature and finish extracting the coffee extract, as shown in Figure 3. The drawback is that it takes a long time to process and therefore requires a lot of heat radiation.

Kihatsu January was obtained as a result of studies aimed at solving the above-mentioned drawbacks.

In other words, Kokuhatsu 811 has an extraction tower with a coffee powder supply part and a coffee extract delivery part in the upper part of the tower, and a liquid extraction part in the lower part of the tower, a circulation circuit including a liquid sending pump, a water supply part, and a heater. The present invention provides a coffee brewing apparatus in which the circulation circuit is connected to a coffee extract delivery part and a liquid extraction part of the extraction tower.

FIG. 1 shows a schematic diagram of an embodiment of the coffee brewing apparatus according to the present invention, and will be described based on the drawings.

Reference numeral 1 is an extraction tower, and a detector 27' for temperature control and a detector 26 for liquid level control are provided. Reference numeral 2 denotes a hopper serving as a coffee powder bed supply section, which is connected to the first liquid feed pipe 5 via a valve 31. 3 is the water supply pipe, valve 32
It is connected to a header 30 provided at the upper part of the extraction column 1 via. Reference numeral 4 denotes a first separator serving as a coffee extract delivery section, which is connected to the extraction column 1 via a first liquid feeding pipe 5.

The separator 4 is provided with an inlet and an outlet for water or a slurry of coffee powder mixed with water, and a coffee extract outlet, with a wire mesh 4' as a boundary. Reference numeral 6 denotes a second liquid feeding pipe, one end of which is connected to the lower extraction portion 1' of the extraction column 1, and the other end connected to the suction side of the liquid feeding pump 7. Reference numeral 8 denotes a third liquid feeding pipe, one end of which is connected to the delivery side of the liquid feeding pump 7 and the other end connected to the heater 9. The heater 9 has a plurality of tubes 9' disposed inside the body, and is configured to supply steam, which is a heating medium, to the body and heat a liquid such as water or slurry passing through the tubes. IO is a fourth liquid feeding pipe, one end of which is connected to the heater 9 and the other end connected to the slurry population of the first separator 4. The fourth liquid feeding pipe l
A detector 28 for temperature control is provided at O, and the supply amount of the heating medium is adjusted so that the temperature of the liquid at the outlet of the heater 9 becomes the set temperature. Reference numeral 11 denotes a first extract delivery pipe, one end of which is connected to the coffee extract delivery port of the first separator 4, and the other end connected to the cooling pipe 12. The cooling pipe 12 is a double pipe and is configured to supply water as a cooling medium to cool the liquid passing through the pipe. 13 is a second extract delivery pipe, one end of which is connected to the cooling pipe 12, and is provided with a flow meter 29 and valves 35 and 36 to control the delivery 11t of the coffee extract from the first separator 4. .

14 is a storage tank for water supply, and is equipped with a valve mechanism for metering. Reference numeral 15 denotes a first water pipe, which has a valve 37 and has one end connected to the water supply tank 14 and the other end connected to the suction side of the water pump 16. The liquid level of the 16 water pumps in the extraction tower 1 is controlled to the set value of the liquid level detector 26. 17 is a second water supply pipe, one end of which is connected to the delivery side of the water supply pump 16 and the other end connected to the @3 liquid supply pipe 8. Reference numeral 18 denotes a residue delivery pipe, which has a valve 38 and one end thereof is connected to the third liquid delivery pipe 8.

- 19 is a residue receiving tank, which is configured to separate the extracted coffee residue from the extract liquid using a wire mesh 19' provided in the tank. 201/i communication pipe, which is connected to a header 30 provided at the top of the extraction column 1 via a valve 39 and a safety valve 40. 21 is a first coffee extract liquid receiving tank;
2 is an extract feed pump.

Reference numeral 23 denotes an extract feed pipe, one end of which is connected to the delivery side of the extract feed pump 22 and the other end connected to the second separator 24. The second separator 24 has a filter element 24' installed therein. 25 is a second coffee extract liquid receiving tank. The extraction tower 1° first separator 4. The heated areas such as the heater 9 and the liquid feeding pipe are coated with a heat insulating material.

The relationship between the coffee liquid extraction operation temperature and time in the coffee extraction apparatus having the above configuration is shown in FIG. 2, and the extraction operation will be explained.

In the figure, A is water and coffee powder bed supply time, B is normal pressure heating and boiling time, C is pressure heating and boiling time, D is cooling time, and E is residue discharge time.

First, all the valves painted in black in FIG. Set it to work. Next, a set amount of water is supplied to the water supply tank 14, and a set amount of coffee powder bed' is supplied to the hopper 2. (A in FIG. 2) Once the water and the coffee powder bed are supplied, the valve 32 of the water supply pipe 3 is opened and a set amount of water is supplied to the extraction tower 1 via the header 30.

When the water is supplied, the liquid sending pump 7 is operated, and the water in the extraction tower 1 is sucked through the second liquid sending pipe 6 and sent to the heater 9 via the third liquid sending pipe 9 at a set temperature (for example, 50°C). Heat to 4th
The liquid is returned to the extraction tower 1 via the first separator 4 and the first liquid feed pipe 5 through the liquid feed pipe 10°. The water in the extraction tower 1 is continuously sent to the heater 9 and heated to about 50°C. When the water in the extraction tower 1 becomes hot water of about 50° C. by this operation, the valve 31 of the hopper 2 is opened and the coffee powder bed is sent to the first liquid feeding pipe 5 and sent to the extraction tower 1 together with the hot water circulating inside the pipe. supply The coffee powder bed fed to the extraction tower 1 is mixed over hot water to form a slurry. When the coffee powder bed in the hopper 2 is supplied to the extraction tower 1, the valve 31f is closed and the outlet temperature of the slurry heater 9 is changed from 50°C to 95°C in order to extract the coffee extract under normal pressure. do.

When the set temperature is changed, the slurry, which was at about 50°C, is heated by the heater 9 and raised to the set temperature of 95°C. (Second
Figure B) Since the slurry is constantly moving, the coffee powder bed remains suspended to extract the coffee extract. The temperature is raised and boiled for about 20 to 30 minutes to complete the extraction of coffee extract at normal pressure. After the extraction at normal pressure is completed, the valve 37 of the first liquid feeding pipe 5 is opened. On the other hand, the set value of the detector 26 that controls the liquid level of the extraction tower 1 is checked to ensure that the liquid level at the end of boiling (total amount of water and coffee powder bed) is activated. Pour cooling water into the pipes. Next, the valve 34 of the first extract delivery pipe 11 is opened, and then the valve 35 of the second extract delivery pipe 13 is opened while checking the flow meter 9. A wire mesh 4' provided in the first separator 4 separates coffee extract and coffee slurry, and the coffee extract is sent out from the first extract delivery pipe 11 and sent to a cooling pipe where it is cooled to a predetermined temperature. The first coffee extract receiving tank 2 passes through the flow meter 29 of the second extract delivery pipe 13.
1. On the other hand, the coffee slurry separated by the wire mesh 4' is returned to the extraction tower 1.

When the amount of coffee extract sent out from the second extract delivery pipe 13 becomes stable, the take-out flow of the flow meter 9 is set and the water pump 16 is operated so that the slurry liquid level in the extraction tower reaches the set position. The water in the water supply storage tank 14 is transferred to the second water pipe 17
The liquid is supplied to the third liquid feed pipe 8 via the liquid feed pipe 8. The supplied water is mixed into the slurry in the pipe, mixed uniformly in the third liquid sending pipe 8 and heater 9, heated to a set temperature, and sent to the first separator 4. The coffee extract extractor and the water supply amount are controlled by controlling the water pump 16 so that the liquid level in the extraction tower 1 is kept constant. The first coffee extract liquid receiving tank 21 [When the coffee extract is delivered to a predetermined amount, the extract feed pump 22 is operated to suck the coffee extract to the second separator 24.
After passing through the wire mesh 4' of the first separator 4, impurities such as coffee powder are removed, and the coffee extract is sent to the second coffee extract receiving tank 25. The extract feed pump 22 is operated while checking the amount of coffee extract in the first coffee extract receiver tank 21. When a predetermined amount of coffee extract is taken out, the valve 35 of the second extract delivery pipe 13 is closed. Discarded water pump 16
stops when the liquid level of the slurry in the extraction tower 1 reaches the set position, and closes the valve 37 of the first water pipe 15. At this time, the slurry in the extraction tower and circulation circuit is constantly sent to the heater 9 by the liquid sending pump 7 and heated to a set temperature.

After the extraction of the coffee extract under normal pressure and the extraction of the coffee extract are completed, the valve 39 of the communication pipe 20 is closed, and the coffee extract is extracted under pressure. That is, when the valve 39 is closed, the extraction tower l and the liquid feeding pipe,
The circulation circuit formed by the liquid sending pump 7° heater 9, etc. is in a sealed state. In the sealed state, set temperature from 95℃ to 1
Set to 60°C. When the slurry is circulated at the same constant temperature as in the coffee extract extraction operation at normal pressure, the pressure inside the extraction tower 1 gradually increases to a pressurized state, and the slurry temperature rises to 160°C. (C in Figure 2) Slurry temperature is 1
At 60°C, coffee extract that could not be extracted under normal pressure and 95°C is extracted. Approximately 30 in the pressurized state
Increase temperature for minutes.

Coffee extract is extracted under boiling and pressurizing conditions. When the extraction is completed, the water in the water supply tank 14 is supplied to the slurry liquid level in the same way as the extraction of the coffee extract under normal pressure, and the coffee extract is taken out to the first coffee extract receiving tank 21 in a preset amount. Impurities are removed in the second separator 24, and a second
The coffee extract is stored in a receiving tank 25 and sent to the canning process.

When the extraction of coffee extract under pressure and the extraction of coffee extract are completed, the valve 3 of the first extract delivery pipe 11 is closed.
4 and close the valve 36 of the first extract delivery pipe 13.
Open the cap and drain the remaining liquid inside the tube. When the remaining liquid is completely discharged, the injection of cooling water into the double pipe of the cooling pipe 12 is stopped, the temperature setting value is changed from 95°C to 0°C, and the supply of heating medium to the heater 9 is stopped. When the supply of the cooling medium and heating medium is stopped, the valve 39 of the communication pipe 20 is gradually opened to release the pressure inside the extraction column 1. When the inside of the extraction tower 1 reaches normal pressure, the valve 32 of the water supply pipe 3 is opened and water is supplied to the extraction tower 1 while checking with the liquid level detector 26 to lower the temperature of the slurry. (D in Fig. 2) After a predetermined amount of water is supplied, the valve 32 is closed, and then the valve 38 of the residue delivery pipe 18 is opened to transfer the slurry that contains almost no coffee extract from the extraction tower 1 to the residue receiving tank. Wire mesh 19 installed in the delivery tank at 19
' Separate the powder bed from which the coffee extract has been extracted. When the slurry in the extraction tower 1 is sent out and its liquid level drops to a position of 20 to 30% of the detector 26, the valve 38 of the residue delivery pipe 18 is closed, and the valve 32 of the water supply pipe 3 is opened to extract water. Feed tower 1. When the liquid level in the extraction tower 1 reaches a predetermined position, close the valve 32 and open the valves 38 and 38 to send out the slurry until there is no extracted coffee powder bed in the extraction tower 1, heater 9, etc. This operation is repeated. (E in Figure 2) When the extracted coffee powder is gone, all the water in the extraction tower is discharged and one cycle of the coffee extraction operation is completed.

When performing the entire coffee extraction operation subsequently, all the water in the extraction tower 1 is not discharged, but when the liquid level reaches the extraction operation level It, the valve 38 is closed to prepare for the next coffee extraction operation.

Although the present invention can be practiced as described above, it is not limited to the examples.

The coffee powder supply section can have five configurations, including not only a single popper as in the embodiment, but also a metering supply mechanism such as a screw feeder or a rotary valve attached to the hopper.

0Coffee extract delivery fi19tJ1;l (4.In addition to the structure in which a separator equipped with a metal wire or a filter element is connected to the extraction tower via a liquid supply pipe, the extraction tower is installed outside or inside the top of the extraction tower. It is possible to have a configuration in which it is integrally provided with.

The zero heater can be of a multi-tube type in which a plurality of tubes are arranged in the body, or of a serpentine type. A heating fluid such as steam or heating oil is used as the heating medium.

The water supply for sending out the coffee extract may be performed by a water supply tank and a water pump, which are connected to a water supply source such as city water through a valve, and the amount of water supplied is adjusted by opening and closing the valve. It's okay.

0 The separator for removing impurities such as coffee powder may be installed in duplicate as in the example, but if the removal efficiency of impurities is good, it can be installed in one separator.

When coffee extract is extracted under zero pressure, pressurized gas is forcibly supplied (9).

Heavy water, brine, or the like is used as the cooling medium supplied to the O cooling pipe.

As mentioned above, Kihatsu Ellj has an extraction tower with an RC coffee powder bed supply section in the upper part and a coffee extract exit section in the lower part of the tower, and a circulation system having a liquid sending pump, a water supply section, and a heater. and a circular circuit, the circulation circuit being connected to the coffee extract exit part and the liquid take-out part of the extraction tower, and for circulating the slurry of water and the coffee powder bed between the extraction tower and the heater. As shown in Figure 2, the time required for temperature rise, boiling and cooling for extracting coffee extract can be reduced to about half compared to the conventional coffee extraction equipment shown in Figure 3, which increases the operating rate and reduces the amount of heat. Consumption can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing one embodiment of the coffee brewing apparatus of the present invention. 2 is a schematic diagram showing the relationship between extraction operation temperature and time in the coffee extraction apparatus of the present invention. FIG. 3 is a schematic diagram showing the relationship between extraction operation temperature and time in a conventional coffee extraction device. 1: Extraction tower, 2: Hopper, 3, Water supply pipe, 4: First separator, 5
: 1st liquid feeding pipe, 6゛2nd liquid feeding pipe. 7: Liquid feeding pump, 8: Third liquid feeding pipe, 9:
Heater, lO1 4th liquid feed pipe. 12: First extract delivery pipe, 12: Cooling pipe, 13: Second extract delivery pipe, 14: Water supply storage tank. 15: First water pipe, 16: Water pump, 17
: 2nd water pipe, 18: Residue delivery pipe. 19: Residue receiving tank, 20: Communication pipe, 21: First coffee extract receiving tank, 22: Extract liquid feeding pump, 23: Liquid feeding pipe, 24: Second separator.

Claims (1)

[Claims] l) Consisting of an extraction tower with a coffee powder supply part and a coffee extract delivery part in the upper part of the tower and a liquid extraction part in the lower part of the tower, and a circulation circuit having a liquid delivery pump, a heater, and a water supply part, A coffee extraction device characterized in that the circulation circuit is connected to a coffee extract delivery section and a liquid extraction section of the extraction tower.