JP3039922B2 - Liquid extraction device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid extracting apparatus and a liquid extracting method, and more particularly to a technique suitable as an apparatus and a method for extracting a beverage such as coffee from raw material powder.

[0002]

2. Description of the Related Art Conventionally, an apparatus for extracting a beverage such as coffee from raw material powder employs a simple method of arranging raw material powder on a filter, pouring hot water from above, and extracting coffee liquid below the filter. In addition, there is a method in which hot water is poured from above coffee grounds, pressure is applied to the hot water by a piston configured to move up and down by a lever, and the coffee liquid is forcibly squeezed from the filter. The latter device is employed when it is necessary to shorten the extraction time in a vending machine or the like, or when it is necessary to obtain a large amount of an extract at a time in a beverage manufacturing factory or the like.

On the other hand, there is a coffee extractor for extracting espresso coffee as shown in FIG.
In this coffee extractor, a heating vessel in which an extraction tool 11 having a structure in which a liquid passage pipe 11b communicates with a lower part of the extraction chamber 11a and a liquid passage plate 11d is provided between the extraction chamber and the liquid passage pipe, is filled with water. 10 are inserted. A paper filter 12 is spread on the liquid-passing plate 11d to put coffee powder, a paper filter 13 is put on the upper opening of the extractor 11, a liquid-passing lid 14 is placed on the paper filter 13, and a drainage lid is further discharged from above. The lid 16 integrated with the pipe 15 is put on and fixed to the heating vessel 10 and sealed. In this state, when the heating vessel 10 is heated by a heating means such as the heater 17, the water inside is heated to generate steam, the pressure inside the heating vessel 10 increases, and the inside pressure of the heating vessel 10 increases due to the increased internal pressure. Hot water rises inside the liquid passage pipe 11b, and the paper filter 1
2 and is pushed up into the extraction chamber 11a. The hot water pushed up into the extraction chamber 11a steams the coffee powder, and the coffee components gradually melt into the hot water.

[0004] As the heating is continued, the liquid level of the hot water in the extraction chamber 11a further rises, and eventually passes through the paper filter 13 and enters the discharge pipe 15, where it is supplied as coffee liquid to the external container 18a.
It is poured into. This situation is continued as long as the pressure in the heating vessel 10 due to the generated steam continues to rise and the hot water continues to be pushed up.

[0005]

However, in the above-described coffee extractor, the hot water is pushed up to the extraction chamber 11a by the rise of the internal pressure due to the steam generated in the heating vessel 10, and the coffee liquid is further discharged. Because it is configured, the extraction temperature and the extraction time are determined by the heating state, the extraction temperature and the extraction time cannot be easily controlled, and especially, the extraction cannot be performed at low temperature.
There is a problem that coffee cannot be extracted under optimal extraction conditions. Further, since the hot water continues to be pushed up, if heating is continued from the beginning to the end, the extraction is initially performed at a relatively low temperature (for example, about 35 ° C.), but since the extraction temperature gradually increases, the extraction is performed at a different temperature. There is a problem that the coffee components that have been mixed enter the external container 18 in a mixed state. In particular, since hot water sequentially passes through the inside of the extraction tool containing the coffee powder, the hot water cannot be kept in the extraction chamber for a predetermined time, and the influence of the inability to secure a sufficient extraction time is great.

On the other hand, in the method of pouring hot water from above, it is possible to make the temperature of the hot water constant or to adjust the temperature of the hot water for extraction. However, extraction conditions such as the extraction pressure and the extraction time depend on the weight of the hot water. Since it is determined, the extraction conditions cannot be optimized, and there is a problem that a path through which the hot water easily passes is formed depending on the pouring position of the hot water and the like, so that uniform coffee extraction cannot be performed. In particular, a method of forcibly applying pressure from above with a piston or the like to squeeze out the coffee liquor enables extraction in a large amount or for a short time, but it mixes unsuitable components as a coffee liquor and affects the taste and aroma of coffee There is a problem of doing.

Accordingly, the present invention has been made to solve the above problems, and its object is to make it possible to easily optimize extraction conditions such as extraction temperature and extraction time, and to separate only preferable components from raw materials. It is an object of the present invention to provide a novel liquid extraction device and a liquid extraction method capable of extracting by extraction.

[0008]

Means taken by the present invention to solve the above-mentioned problems are to provide a solvent chamber for accommodating an extraction solvent and a solvent chamber at a predetermined distance below the uppermost portion inside the solvent chamber. A liquid passage, an inlet port communicating with the liquid passage at a lower portion, and a discharge port provided at an upper portion, and configured to hold therein a raw material extracted by the extraction solvent. A liquid extraction apparatus, comprising: an extracted extraction chamber; and an internal pressure control unit capable of controlling the internal pressure of the solvent chamber independently of the temperature of the extraction solvent.

According to this means, the extraction solvent is introduced into the solvent chamber so that the liquid level of the extraction solvent is sufficiently higher than the opening of the liquid passage, and the internal pressure of the solvent chamber is increased by the internal pressure control means. As a result, the extraction solvent is pushed up to the extraction chamber through the liquid passage.By holding the raw material inside the extraction chamber, the extraction of the raw material can be performed simply by changing the internal pressure of the solvent chamber. Extraction can be performed by immersion in a solvent. Further, in this state, by further increasing the internal pressure of the solvent chamber, more extraction solvent can be pushed up to the extraction chamber, so that the liquid that has been completely extracted from the raw material in the extraction chamber is discharged from the outlet. You can also.

[0010] In particular, since the internal pressure of the solvent chamber can be controlled independently of the temperature of the extraction solvent by the internal pressure control means, the amount of the solvent introduced into the extraction chamber at an arbitrary temperature, the introduction speed, and the holding speed. It is possible to easily control the time etc., and to push up the extraction solvent and discharge the liquid only by adjusting the internal pressure of the solvent chamber, so apply excessive pressure to the extraction solvent and the liquid after extraction. Without extracting
Can be discharged. Furthermore, since the extraction solvent is fed into the extraction chamber by pushing up the extraction solvent from below through the liquid passage, the flow-down action due to the own weight of the extraction solvent is not affected, for example, even when a powdery raw material is used, A good extraction state can be obtained.

Therefore, when a liquid is obtained by elution from the raw material into the extraction solvent, the movement of the extraction solvent at an arbitrary temperature is controlled to control the extraction speed, extraction time and other extraction conditions to optimum or desired conditions. It becomes possible to do.

Here, the internal pressure control means includes an air supply means for introducing gas into the solvent chamber, and an amount of air supplied to the interior of the solvent chamber by the air supply means. It is preferable to provide an air supply control means for controlling the internal pressure of the chamber. According to this means, the internal pressure of the solvent chamber can be freely controlled by the air supply control means and the air supply means, and the extraction conditions and the contents of the extraction step can be very easily controlled.

It is desirable that each of the above means further include a solvent temperature control means for controlling the temperature of the extraction solvent in the solvent chamber. According to this means, while the temperature of the extraction solvent can be controlled by the solvent temperature control means,
Since the internal pressure control means can control the internal pressure independently of the temperature of the extraction solvent, the extraction conditions such as the extraction temperature, the extraction speed, and the extraction time can be set with higher accuracy. The basic configuration of the solvent temperature control means includes a heater or other heating means for directly heating the solvent chamber, a temperature sensor such as a temperature sensor for detecting the temperature of the extraction solvent in the solvent chamber, a heating means and a temperature. In some cases, the temperature control device is connected to a detector.

[0014] In this case, the solvent temperature control means may store the extraction solvent and adjust the temperature of the stored extraction solvent. A solvent supply path for supplying to the solvent chamber,
It is preferable that the apparatus further comprises a solvent supply control means for controlling a supply state of the extraction solvent. According to this means, the extraction solvent is adjusted to a predetermined temperature in the solvent storage tank, and the extraction solvent is sent from the solvent storage tank to the solvent chamber via the solvent supply path, so that the temperature of the extraction solvent can be reduced. The uniformity and stability can be improved, and the extraction operation can be repeatedly or continuously performed by repeatedly or continuously supplying the extraction solvent to the solvent chamber.

In each of the first through third aspects, the internal pressure of the solvent chamber is increased by increasing the internal pressure of the solvent chamber by the internal pressure control means, and the extraction solvent put in the solvent chamber is passed through the liquid passage. To the extraction chamber and maintain the internal pressure of the solvent chamber for a predetermined time so that the extraction solvent is held inside the extraction chamber. Thereafter, the internal pressure of the solvent chamber is increased by the internal pressure control means. It is preferable that the extractor is further configured to be discharged from the outlet through the outlet, which is further elevated and accommodated in the extraction chamber. According to this means, the operation of pushing the extraction solvent into the extraction chamber,
By sequentially holding the extraction solvent in the extraction chamber for a predetermined time and discharging the extraction solvent from the extraction chamber, the extraction conditions can be made constant, and a uniform and sufficient liquid can be extracted.

Next, as the liquid extraction method, a solvent chamber for accommodating the extraction solvent, a liquid passage open inside the solvent chamber, an inlet communicating with the liquid passage at a lower portion, and An extraction chamber provided at the top, and an extraction chamber configured to hold a raw material to be extracted by the extraction solvent therein is provided, and the extraction solvent is placed inside the solvent chamber. Increasing the internal pressure of the solvent chamber to push up the extraction solvent to the extraction chamber through the liquid passage, and the extraction of the solvent chamber so that the extraction solvent is held inside the extraction chamber A liquid extraction method comprising: maintaining an internal pressure for a predetermined time; and thereafter further increasing the internal pressure of the solvent chamber to discharge the extraction solvent contained in the extraction chamber from the outlet.

In this case, in particular, when the step of pushing up the extraction solvent, the step of holding the extraction solvent in the extraction chamber, and the step of discharging the extraction solvent are sequentially performed, the next step of extracting the extraction solvent at the same time in the discharging step is performed. Is pushed up into the extraction chamber, so that the extraction can be repeatedly performed by performing the previous discharge step and the next push-up step in parallel. In particular, by gradually increasing the temperature of the extraction solvent during the previous holding step and raising the temperature of the next extraction, it is possible to perform a plurality of extractions using the same raw material while ensuring the extraction concentration.
Also, a plurality of extractions can be performed by keeping the extraction temperature constant without increasing the extraction temperature and lengthening the extraction time. Further, in the case where these discharges are repeated a plurality of times, since the liquid extracted each time is intermittently discharged each time, the liquid extracted each time can be separated and taken out.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of a liquid extracting apparatus according to the present invention will be described with reference to the accompanying drawings. Although the embodiment of the liquid extraction device described below is a device for extracting coffee liquid, the present invention is not limited to the extraction of coffee, tea, decoction, other drying materials, and various other materials from various raw materials. It can be widely applied when various liquids are extracted using an extraction solvent. Although the present invention is suitable for extracting a liquid from a raw material powder, the raw material is not limited to a powder material.

FIG. 1 is a schematic configuration diagram showing the overall configuration of the coffee extraction device of the present embodiment. In this embodiment, as a substantial structural part, the extraction device 20, a hot water supply unit 30 connected to the extraction device 20 via a hot water supply pipe 33, and a discharge pipe 15 for the extraction device 20 are provided. And a pressurizing mechanism 50 connected to the extraction device 20 via a pressurizing tube 56.

The extraction device 20 includes a heat insulation container 21 having a heat insulating structure that can be opened and closed, a heating container 22 housed inside the heat insulation container 21, and an extraction tool 23 attached inside the heating container 22. And A hot water supply pipe 33 drawn out of the hot water supply unit 30 is introduced into the heating container 22, and a pressurizing pipe 56 guided from the pressurizing mechanism 50.
Has been introduced. A temperature sensor 63 is attached to a lower portion inside the heating container 22, and a temperature sensor 64 is attached to a lower portion inside the heat retaining container 21. A heater 61 for heating the heating container 22 is provided in the heat retaining container 21, and the heater 61 is connected to an AC power supply via a temperature controller 81. The output of the temperature sensor 64 provided in the heat retaining container 21 is supplied to the temperature controller 81.

FIG. 2 is an enlarged sectional view of the extraction device 20. Extraction tool 23 attached inside heating vessel 22
Is an extraction chamber 23a arranged at the upper inside of the heating vessel 22.
And a liquid passage tube 23b connected to the lower end of the wall surface conically reduced in diameter from the lower part of the extraction chamber 23a. The liquid passage tube 23b opens into the heating container 22 at a lower opening 23c provided at the lower end thereof. In the lower part of the extraction chamber 23a, a liquid passage plate 23d having a number of pores is formed so as to block the extraction chamber 23a and the liquid passage pipe 23b.
A paper filter 24 is laid on d. The upper part of the extraction tool 23 is opened to form an upper opening 23e,
The extraction tool 23 is engaged with the heating container 22 at the opening edge.

A paper filter 26 is provided on the opening edge of the upper opening 23e of the extraction tool 23 via a sealing ring 25 made of heat-resistant rubber or the like. Liquid cover 27 is covered. The upper surface of the liquid passage lid 27 is covered by a lid 28 that covers the heating container 22. The lid 28 is fastened to the heating container 22 via a sealing ring 25 to seal the solvent chamber defined inside the heating container 22. The lid 28 is integrated with the discharge pipe 15.

Referring again to FIG. Hot water supply unit 3
In FIG. 2, a hot water supply pipe 33 is drawn out from a hot water tank 31 configured to contain hot water via a hot water supply valve 32, and the hot water supply pipe 33 is introduced into the heating container 22 as described above. A heater 62 is provided in the hot water tank 31, and the heater 62 is connected to an AC power supply via a temperature controller 82. The temperature controller 82 has a temperature sensor 6 for measuring the temperature of hot water installed in the hot water tank 31.
5 outputs are provided. The temperature sensor 6
Outputs of 3, 64 and 65 are connected to a monitor device 83 installed in a control panel described later.

The discharge pipe 15 connected to the lid 28 of the heating vessel 22 is connected to separation pipes 42 and 44 via a switching valve 41, and the tip of the separation pipe 42 is opened in the separation vessel 43. I have. The separation pipe 44 is connected to separation pipes 46 and 48 via a switching valve 45, and the separation pipe 46 is opened in a separation vessel 47, and the separation pipe 48 is opened in a separation vessel 49. The switching valves 41 and 45 are in a state in which all three connection pipes are shut off from each other, and in a state in which only the upstream connection pipe and the downstream one of the three connection pipes communicate with each other. 3 configured to switch a total of 3 states
It is a dialect.

The pressurizing tube 56 introduced into the heating container 22 is for supplying air supplied from the pressurizing mechanism 50. The pressurizing mechanism 50 has an air compressor 51, an air tank 52 for storing air supplied from the air compressor 51, and a pressure control unit 53 connected to the air tank 52. Is provided with an air supply valve 54. The air supply valve 54 is connected to the pressurizing pipe 56, and a pressure sensor 55 for detecting the pressure of the air flowing out of the air supply valve 54 is provided. The output of the pressure sensor 55 is fed back to the pressure control unit 53. Have been. Air compressor 51 and air tank 5
2 is linked with the air compressor 51 according to the output of a pressure sensor (not shown) installed in the air tank 52.
Are started and stopped, or the operation output is controlled, so that the air pressure in the air tank 52 is always maintained at substantially the same pressure value. In the pressure control unit 53, a valve structure such as an internal switching valve, a flow control valve, a one-way valve and the like are provided so that the supply air pressure to the pressurizing pipe 56 can be changed according to a control input described later. A control circuit for appropriately controlling is provided.

FIG. 3 shows a configuration example of a control system according to the present embodiment. In this configuration example, the above-described respective structural units are controlled by a personal computer 70 via a control panel 80. In the personal computer 70,
A central processing unit (CPU) 71 and a memory 72 composed of a ROM for storing programs, basic parameters, and the like.
, An execution memory 73 composed of a RAM, an analog input / output circuit 74, and a digital input / output circuit 75. The personal computer 70 controls the control panel 8 via an analog input / output circuit 74 and a digital input / output circuit 75.
Connected to 0. The control panel 80 includes the above-described temperature controller 8.
1, 82, a monitor device 83, a pressure control unit 53, and a switching power supply circuit 85 are installed and connected to each unit as shown in FIG.

The monitor device 83 is connected to the temperature sensors 63, 64, and 65 to monitor the temperature of each part as described above, and also monitors the air tank 52, the pressurizing pipe 56, and the heating vessel 2.
2. It is configured to monitor the pressure of each part such as the discharge pipe 15. The monitor device 83 is configured so that the temperature and pressure of each part can be confirmed also on the control panel 80 and can be appropriately operated. Normally, the data of each part is sent to the personal computer 70 as it is or as appropriate. The detection data is used in a program executed by the personal computer 70.

The pressure control section 53 sends air of a predetermined pressure into the heating container 22 to apply a predetermined pressure based on a command from the personal computer 70. Here, the command of the personal computer 70 includes an appropriate pressure control value for controlling the pressure control unit 53 according to the temperature and pressure of each unit sent from the monitor device 83. The pressure control unit 53 performs feedback control based on the output value of the pressure sensor 55, and is configured to send out an appropriate amount of air at an appropriate pressure according to the pressure control value received from the personal computer 70.

The personal computer 70 has a memory 7
2 is configured to perform control according to a predetermined control procedure according to the program and basic parameters recorded in the program. The central processing unit 71 controls the temperature controllers 81 and 8 according to the temperature and pressure of each unit received from the monitor device 83.
2 to send appropriate temperature control by sending a temperature reference value and control parameters to the hot water supply valve 32, the switching valves 41 and 45, the intake valve 54, and a regulating valve in the pressure control unit 53. Sends open / close control signal to supply to each part,
Execute a shutoff operation or pressure adjustment operation, etc.
A command indicating the air supply pressure value is sent to the pressure control unit 53 to adjust the supply air pressure to an appropriate value.

Next, the operation of this embodiment having the above structure will be described. First, the basic operation of extracting coffee will be described. In order to extract coffee, coffee powder is put on the paper filter 12 of the extraction tool 23, the heating container 22 is sealed, and first, the hot water supply valve 32 is opened to supply a certain amount of hot water into the heating container 22. Introduce. At this time, hot water tank 31
The supply of hot water is performed after confirming that the temperature of the hot water in the inside has reached a predetermined temperature. The amount of hot water introduced into the heating container 22 is usually an appropriate amount according to the expected coffee extraction state.
A sufficient amount of hot water is introduced at a time so that the water level of the hot water is kept higher than the lower opening 23c even if the amount of hot water enough to substantially fill the inside of a is pushed up.

When the introduction of hot water is completed, the hot water supply valve 32 is shut off, and then the heating of the heating vessel 22 by the heater 61 and the introduction of air from the pressure control unit 53 are started. If the temperature of the hot water in the heating container 22 already matches the coffee extraction temperature, the heater 61 operates to maintain the temperature of the hot water, and the introduction of air starts immediately. When the temperature of the hot water in the heating container 22 is lower than the coffee extraction temperature, the hot water is raised by the heater 61 and the introduction of air is started when the hot water temperature reaches a predetermined temperature and becomes stable. When the air supply valve 54 is opened, air at a controlled pressure is introduced into the heating container 22, and accordingly, the hot water in the heating container 22 is pushed up into the extraction chamber 23a through the liquid passage pipe 23b. The introduction of air is performed in consideration of generation of water vapor from hot water in the heating container 22. The water temperature is high to some extent,
In addition, when sufficient time is sufficient, the air pressure may be introduced by waiting for a rise in the pressure in the heating container 22 due to the steam, and then replenishing the pressure.

While monitoring the internal pressure in the heating vessel 22, when the internal pressure reaches a predetermined value, it is determined that a predetermined amount of hot water has been pushed up into the extraction chamber 23a, and the supply of air is stopped, and the predetermined amount of air is stopped. That state (internal pressure) is maintained for a predetermined time. At this time, if the pressure in the heating container 22 increases due to the water vapor with the passage of time, a pressure reducing valve is provided in the heating container 22 in order to maintain the above holding state. Air may be leaked to keep the pressure inside the heating container 22 constant. After a lapse of a predetermined time, the discharge pipe 15 and the separation pipe 42 are communicated with each other by the switching valve 41, and then the air is supplied again from the pressure control unit 53, and the hot water is further pushed up into the liquid pipe 23b, thereby already extracting the hot water. The coffee liquid from which coffee has been extracted in the chamber 23 a is discharged into the separation container 43 through the discharge pipe 15.

In this case, while the coffee liquid is discharged into the separation container 43, new hot water is pushed up and the extraction chamber 23 is discharged.
When the coffee is continuously extracted, the extraction is performed by maintaining the pressure in the heating container 22 for a predetermined time, and the same discharging operation as described above is performed after a predetermined time has elapsed. Repeat. This operation may be repeated any number of times, but when repetitive extraction is performed, additional hot water from the hot water tank needs to be replenished before the hot water runs short.

As described above, in the present embodiment, the operation of pushing up the hot water into the extraction chamber 23a, maintaining the extraction state, and discharging the liquid after the extraction are sequentially performed, so that the hot water is controlled at the controlled hot water temperature. Since coffee extraction can be performed for a predetermined time, a coffee liquid extracted at an optimum or desired extraction temperature and extraction time can be obtained.

In general, when extracting coffee liquid, the extraction temperature and the extraction time are important, and it is important to take out the coffee liquid without applying excessive pressure during the extraction. In this embodiment, the coffee liquor can be taken out uniformly and without applying an excessive pressure by adopting the conventional espresso extraction method. Time can be easily controlled. In the extraction of coffee liquor, the extraction temperature is much lower than the extraction temperature by a normal espresso method or the extraction temperature by a normal filter method, for example, about 30 to 40 ° C., and the extraction time is sufficient (for example, about 2 to 3 minutes). By doing
Since it is possible to avoid deterioration of the ingredients of the coffee grounds as much as possible, the aroma is high and
A coffee liquid with a small amount of unnecessary components that inhibits aroma and taste can be obtained. If the extraction temperature is high, the oil and fat components of the coffee are also extracted, and the taste and aroma are both deteriorated. However, this can be realized only when excessive pressure is not applied at the time of extraction and a sufficient extraction time is secured. In the present embodiment, such ideal extraction conditions can be easily obtained.

In the present embodiment, the extraction of coffee grounds can be performed stepwise at different extraction temperatures. As described above, it is impossible to obtain a coffee liquid having the same concentration again at the same temperature with respect to the coffee powder once extracted at a predetermined temperature. However, by extracting at a low temperature at first and then at a higher temperature from the next time, it is possible to obtain a coffee liquid which is different in liquid quality but can withstand drinking a plurality of times from the same coffee powder. In addition, the coffee liquid which can endure drinking can be obtained repeatedly by lengthening the extraction time after the next time. Further, the extraction may be performed by adopting both the rise in the temperature and the increase in the extraction time.

When coffee is extracted a plurality of times from the same raw material under different temperature conditions, first, as described above, the first extraction is performed at a relatively low predetermined temperature for a predetermined time. After that, the heating vessel 22 is heated by the heater 61 to raise the temperature of the hot water in the heating vessel 22 and then air is introduced, and the pressure in the heating vessel 22 is increased to put new hot water into the extraction chamber 23a. Push up. The coffee liquid extracted first is discharged into the separation container 43 as described above, and hot water having a higher temperature is filled into the extraction chamber 23a. Here, again, the pressure is kept constant (if necessary, the above-described pressure reducing valve is used), and fresh coffee is extracted.
After the elapse of the holding time, the air is introduced again to discharge the coffee liquid as described above. At this time, when the coffee liquid extracted first and the coffee liquid extracted this time are separated and taken out, the switching valve 41 is switched so that the discharge pipe 15 and the separation pipe 44 communicate with each other. Tube 4
Then, the switching valve 45 is switched so that the coffee liquid is communicated with the liquid 6 and the coffee liquid is discharged to the separation container 47. In order to perform the extraction one more time, the inside of the heating vessel 22 is further heated to increase the temperature before the current coffee liquid is discharged, and then the hot water is pushed up and the coffee liquid is discharged in the same manner as described above. Do. Then, the third extracted coffee liquid is discharged to, for example, the separation container 49. In the above-described coffee extraction process, the hot water supply unit 30 may appropriately supply additional hot water.

In the above-described embodiment, air is introduced into the heating container 22, but other suitable gas may be introduced. The type of gas is selected according to the situation,
In the case of coffee extraction, an inert gas such as nitrogen or carbon dioxide is preferred.

In the above embodiment, the hot water kept at a predetermined temperature is introduced into the heating vessel from the hot water supply unit 30 provided with the hot water tank 31.
Without providing 0, hot water at a predetermined temperature may be formed by putting water into the heating container 22 and directly heating the heating container 22.

[0040]

According to the present invention, when a liquid is obtained by eluting a raw material into an extraction solvent, the movement of the extraction solvent at an arbitrary temperature is controlled to optimize the extraction speed, extraction time and other extraction conditions. Alternatively, it can be controlled to a desired condition.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing a schematic structure of an embodiment of a liquid extraction device according to the present invention.

FIG. 2 is a schematic longitudinal sectional view showing an extraction unit 20 in the same embodiment in an enlarged manner.

FIG. 3 is a schematic block diagram illustrating a configuration example of a control system in the embodiment.

FIG. 4 is a schematic longitudinal sectional view showing the structure of a conventional espresso coffee extractor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 15 Discharge pipe 20 Extraction device 21 Insulation container 22 Pressurized container 23 Extraction tool 23a Extraction chamber 23b Liquid passage 30 Hot water supply unit 31 Hot water tank 32 Hot water supply valve 33 Hot water supply pipe 40 Liquid discharge unit 50 Pressurization mechanism 53 Pressure control Part 54 air supply valve 55 pressure sensor 70 personal computer 80 control panel

Claims (1)

(57) [Claims] A solvent chamber for containing an extraction solvent;
A predetermined distance below the top of the solvent chamber
A fluid passage that opens at
An inlet through which the gas flows through and an outlet provided at the top,
Holds the raw material extracted by the extraction solvent
And an internal pressure of the solvent chamber.
Internal pressure control that can be controlled independently of the extraction solvent temperature
Step andA solvent for controlling the temperature of the extraction solvent in the solvent chamber.
Medium temperature control meansWithAnd The internal pressure control means guides a gas into the solvent chamber.
Air supply means for entering the inside of the solvent chamber by the air supply means
The internal pressure of the solvent chamber by adjusting the amount of air supplied to the
Air supply control means for controlling the The solvent temperature control means accommodates and accommodates the extraction solvent.
Solvent storage configured to be able to adjust the temperature of the extracted solvent
A tank and supplying the extraction solvent from the solvent storage tank to the solvent chamber.
A solvent supply path to be supplied and a supply state of the extraction solvent.
Solvent supply control means, The internal pressure of the solvent chamber is increased by the internal pressure control means.
And the extracted solvent contained in the solvent chamber is passed through the
The liquid is pushed up to the extraction chamber through a liquid path, and the extraction solvent is
Inside the solvent chamber so as to be held inside the extraction chamber
Maintaining the pressure for a predetermined time, and thereafter,
The internal pressure of the solvent chamber is further increased by
The extraction solvent contained in the
Configured to discharge, Repeated or continuous from the solvent storage tank to the solvent chamber
The extraction solvent is sent to the
Be configured to run continuously Liquid characterized by
Extraction device.