JPH0710677Y2 - Coffee extractor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a so-called centrifugal extraction type (espresso type) coffee extractor.

(Prior Art) Generally, by shortening the contact time between hot water and coffee powder at the time of extraction, it is possible to improve the flavor of coffee liquid without extracting components that impair the flavor (for example, bitterness components) from the coffee powder. . In order to realize this, a so-called centrifugal extraction type coffee extractor has recently been considered. In this coffee extractor, a motor is provided in the extractor body, and a rotating case for extracting coffee liquid is connected and supported at the upper end of the upward rotating shaft of the motor. A filtering unit for extraction is provided. Then, at the time of extraction, the motor is driven to rotate the case at a high speed, and the hot water supplied into the rotating case is quickly passed through the coffee powder in the rotating case by the rotating centrifugal force. It is to be extracted as coffee liquid from. During the centrifugal extraction, the rotary case is housed in the liquid receiving case so as to receive the coffee liquid scattered from the filtering portion of the rotary case, and the L-shaped case is provided at the bottom of the liquid receiving case so as to project laterally. The coffee liquid is made to drip into the bottle below from the extraction nozzle.

(Problems to be solved by the invention) By the way, a swirling flow of air is generated in the liquid receiving case due to the high speed rotation of the rotating case, and this swirling air flow (wind)
Has a drawback that the extraction nozzle at the bottom of the liquid receiving case vigorously blows into the bottle to cool the coffee liquid in the bottle, and the jet pressure of the wind causes the coffee liquid to scatter from the extraction nozzle to the surroundings and pollute the surroundings. there were.

The present invention has been made in consideration of such circumstances, and therefore, an object thereof is to centrifugally extract coffee liquid so that the wind generated in the liquid receiving case blows out vigorously from the outlet end of the extraction nozzle. It is to provide a coffee extractor that can prevent the problem of cooling and scattering of coffee liquid due to wind.

[Construction of the Invention] (Means for Solving the Problem) The coffee extractor of the present invention spins the rotating case at a high speed while hot water is supplied into the rotating case containing the coffee powder and centrifugally extracts the coffee liquid. The liquid receiving case installed so as to surround the periphery of the rotating case so as to receive the coffee liquid scattered from the rotating case during centrifugal extraction, and a lateral side on the bottom of the liquid receiving case. And an extraction nozzle provided so as to project to the upper part of the extraction nozzle, and an air vent hole is formed in an upper wall portion of the extraction nozzle.

(Operation) During centrifugal extraction, wind that swirls in the liquid receiving case is generated, but since an air vent hole is formed in the upper wall of the extraction nozzle, the air comes out through this air vent hole. Therefore, the wind blown from the outlet end of the extraction nozzle can be effectively weakened, and the problem of cooling and scattering of the coffee liquid due to the wind can be solved. In this case, since the air vent hole is provided in the upper wall portion of the extraction nozzle, the coffee liquid passing through the extraction nozzle does not spill out from the air vent hole.

(Embodiment) An embodiment in which the present invention is applied to a coffee extractor with a mill function will be described below with reference to the drawings. Reference numeral 1 denotes an extractor body, and a placing plate 3 for placing a bottle 2 for storing coffee liquid is provided below the extractor body. A heater 5 and a heating pipe 6 are provided in close proximity to each other on a heating plate 4 provided on the lower surface side of the mounting plate 3, and water is supplied into the heating pipe 6 from a water storage tank (not shown). To be done. On the other hand, in the extractor body 1,
A motor storage chamber 1a is formed on the left side of the bottle 3, and a vertical axis type motor 7 is stored in the motor storage chamber 1a. The motor 7 is a commutator motor whose rotation direction is reversible. An inner coupling 10 for driving the crushed body 9 described later is fixed to the upper end of the rotary shaft 8 protruding upward of the motor 7. An outer coupling 12 for driving a rotating case 11, which will be described later, is fitted to the outer periphery of the inner coupling 10 so as to be relatively rotatable. 13 is the outer coupling of the rotational force of the motor 7
A clutch mechanism that selectively transmits to this clutch mechanism
A coil spring 15 is wound around the cylindrical base member 14 fitted to the rotary shaft 8 and a lower portion of the outer coupling 12, and the lower end of the coil spring 15 is fixed by a pin 16 to form a cylindrical shape. It is configured to be fixed to the base member 14. In this case, the clutch mechanism 13 is configured as a friction one-way clutch, and when the motor 7 is rotating normally, the coil spring 15 is loosened from the outer coupling 12, and the rotational force of the motor 7 is transmitted to the outer coupling 12. Not the inner coupling
Only 10 are driven to rotate. On the other hand, when the motor 7 rotates in the reverse direction, the coil spring 15 is wound around the outer coupling 12 by the frictional force, and the both couplings 10 and 12 are integrally driven to rotate.

A liquid receiving case 17 is removably attached to the upper portion of the clutch mechanism 13, and an L-shaped extraction nozzle 18 provided at the right end of the bottom of the liquid receiving case 17 so as to project laterally is provided in the bottle 2 Facing the upper opening of the. And this liquid receiving case
A rotating case 11 for both coffee bean crushing and coffee liquid extraction is housed inside 17, and a cylindrical joint 19 formed downward at the bottom of this rotating case 11 is fitted and connected to the outer cup rig 12, and thereby rotated. The configuration is such that the case 11 is supported. In this case, the inner peripheral surface of the tubular joint 19 and the outer coupling 12
The outer peripheral surfaces of both are formed in a concavo-convex shape so as to prevent both from rotating by meshing with each other. Also, the rotating case 11
A crushed body 9 is rotatably provided inside the crushed body 9.
The support shaft 20 is fitted and connected to the inner coupling 10.
On the other hand, the upper surface opening of the rotating case 11 has a hot water supply port 21 at the center.
A dome-shaped lid 21 having a is covered, and a gap of, for example, about 0.2 mm is uniformly formed between the lid 21 and the upper end of the rotating case 11, and the gap serves as a filtering portion 22. This filtering part
The inner peripheral surface of the rotating case 11 is formed in a tapered surface shape in which the upper side expands in order to raise the hot water (coffee liquid) toward the 22 by the rotational centrifugal force. In this case, the lid 21 is fixed by engaging the engaging claw 23 formed on the lid 21 with the rosette coupling groove 24 formed on the upper edge portion of the rotating case 11. Further, in the upper opening of the liquid receiving case 17,
A lid 25 having a funnel-shaped hot water supply opening 25a is covered, and the hot water supply opening 25a of the lid 25 is inserted into the hot water supply opening 21a of the lower lid 21. Above the lid 25, a hot water supply arm 26 communicating with the heating pipe 6 is provided so as to be horizontally rotatable.
The hot water outlet 26a of 26 can be located right above the hot water supply port 25a of the lid 25. The hot water supply arm 26, the heating pipe 6 and the heater 5 constitute a hot water supply mechanism 27. 28 is a hot water supply arm
A lid that covers the upper part of 26, and 29 is an annular cushion member that is detachably attached to the inner circumference of the liquid receiving case 17, and may contact the inner surface of the liquid receiving case 17 when the rotating case 11 vibrates. (In this embodiment, it is arranged in a portion facing the filtering portion 22).

Thus, the upper wall 18a of the extraction nozzle 18 has, for example, a diameter of 2 mm.
A wind vent hole 30 of a certain degree is formed. In this embodiment, as shown in FIG.
Is located directly above the outlet end 18b of the nozzle and a tapered recess 18c is formed in the horizontal abutting portion (bent portion) in the extraction nozzle 18.

Next, the electric circuit configuration of the main part will be described with reference to FIG. In order to reverse the energization direction to the field coils 7a and 7b and the armature coil 7c of the motor 7, two changeover switches 31 and 3 are provided.
2 is provided, and a forward rotation switch 33 is provided between the field coil 7b and the power supply line 34.
A series circuit of a resistor 35 and a reverse rotation switch 36 is provided in parallel with 33. In this case, during the crushing operation, the flexible contact 31a of the changeover switch 31 contacts the fixed contact 31b, the flexible contact 32a of the changeover switch 32 contacts the fixed contact 32b, and the forward rotation switch 33 is turned on. Thus, the motor 7 rotates forward at, for example, 10000 rpm. On the other hand, during the extraction operation, the flexible contact 31a of the changeover switch 31 is changed over to the fixed contact 31c side, and the flexible contact 3a of the changeover switch 32 is changed.
2a switches to fixed contact 32c, and reverse rotation switch 36
Is turned on, which causes the motor 7 to
Reverse rotation at 5000 rpm. The reason why the number of revolutions during reverse rotation is reduced to half that during forward rotation is that the voltage applied to the motor 7 is reduced due to the presence of the resistor 35. 37 is a heater switch provided in the energizing path to the heater 5. The switching operation of these switches 31, 32, 33, 36, 37 is controlled by the microcomputer 38.

Next, the operation of the above configuration will be described. In the procedure for extracting the coffee liquid, first, water is supplied into the water storage tank 2, coffee beans are stored in the rotating case 11, and the coffee beans are set in the state shown in FIG. Then, when the operation for starting the crushing operation is performed, the microcomputer 38 causes the movable contact 31a of the changeover switch 31 to contact the fixed contact 31b, and the movable contact 32a of the changeover switch 32 contacts the fixed contact 32b, and for normal rotation. The switch 33 is turned on and the motor 7 is, for example, 10000 rpm.
To rotate forward. By the normal rotation of the motor 7, the crushed body 9
Is rotated and the coffee beans in the rotating case 11 are crushed. During this crushing operation, since the rotation direction of the motor 7 is the loosening direction for the coil spring 15 of the clutch mechanism 13, the coil spring 15 loosens from the outer peripheral surface of the outer coupling 12, and the rotational force of the motor 7 becomes the outer coupling. It is not transmitted to 12, and the rotating case 11 maintains a substantially stopped state.

After performing such a crushing operation for a set time (for example, 30 to 40 seconds), the microcomputer 38 turns off the forward rotation switch 33 and the motor 7 is temporarily stopped. Then, the heater switch 37 is turned on to start energizing the heater 5. As a result, the water supplied from the water storage tank into the heating pipe 6 is sequentially turned into hot water, and the boiling pressure of the water causes the hot water to be sequentially pushed up to the hot water supply arm 26, and the hot water outlet 26
Rotating case 11 through hot water supply 25a, 21a of both lids 25, 21 from a
Hot water is supplied inside. Then, at substantially the same time as the start of hot water supply, the microcomputer 38 causes the movable contact of the changeover switch 31 to move.
31a is switched to the fixed contact 31c side, and the changeover switch 32
The movable contact 32a is switched to the fixed contact 32c, and the reverse rotation switch 36 is turned on. As a result, the energization direction to the motor 7 is reversed, and the motor 7 rotates in the reverse direction at 5000 rpm, for example. Since this rotation direction is the winding tightening direction for the coil spring 15 of the clutch mechanism 13, the coil spring 15 is wound around the outer peripheral surface of the outer coupling 12, and the rotational force of the motor 7 is also transmitted to the outer coupling 12. It As a result, both the inner and outer couplings 10 and 12 rotate integrally, and the rotating case 11 rotates integrally with the crushing body 9 at high speed.
In this way, the rotating case rotates almost at the same time as the hot water supply start time.
The rotation of 11 is started, and immediately after the rotation is started, the coffee grounds A in the rotating case 11 are evenly dispersed by the centrifugal force on the peripheral side wall side as shown in FIG. It will be in a state of being. In this state,
As described above, hot water is discharged from the hot water supply arm 26 to the central portion of the rotating case 11, and is received by the crushed body 9 and the inner bottom surface of the rotating case 11. At this time, the hot water received on the pulverized body 9 scatters around by the rotation of the pulverized body 9 so as to be shaken in the centrifugal direction, and permeates into the coffee powder A from the inner peripheral side thereof. Further, the hot water received by the inner bottom surface of the rotating case 11 penetrates into the coffee powder A along the inner bottom surface by the centrifugal force generated by the rotation of the rotating case 11. In this way, the hot water that has penetrated into the coffee grounds A passes through the coffee grounds A relatively quickly by the rotating centrifugal force while extracting the extract from the coffee grounds A, and the rotating case 11
Reaching the inner surface of the peripheral side wall of the rotating case 11 and further rising along the tapered surface of the inner surface of the peripheral side wall of the rotating case 11, scattering from a slight gap between the upper end of the rotating case 11 and the lid 21, that is, the filtering part 22 to the surroundings. Case
Can be received on the inner wall of 17. Then, the coffee liquid scattered from the filtering unit 22 and received by the inner side wall of the liquid receiving case 17 flows downward along the inner side wall and is finally dripped into the bottle 2 from the extraction nozzle 18 and stored therein. .

At the time of this centrifugal extraction, the swirling wind is generated in the liquid receiving case 17 due to the high speed rotation of the rotating case 11, but a wind vent hole 30 is formed in the upper wall portion of the extraction nozzle 18 of the liquid receiving case 17. Therefore, the wind blown into the extraction nozzle 18 is
It comes into contact with the tapered recess 18c of the inner bent portion, changes its direction, and comes out through the air vent hole 30 to the outside. For this reason, the wind blown from the outlet end 18b of the extraction nozzle 18 is effectively weakened, and it is possible to prevent the coffee liquid in the bottle 2 from being cooled by the wind, and the coffee liquid from the outlet end 18b is reduced in pressure to the surroundings. It can be prevented from scattering and polluting the surroundings. In this case, since the air vent hole 30 is provided in the upper wall portion 18a of the extraction nozzle 18, the coffee liquid passing through the inside of the extraction nozzle 18 does not spill out from the air vent hole 30.

Further, in the above-described embodiment, since the cushion member 29 is provided in a portion of the inner surface of the liquid receiving case 17 that may come into contact with the rotating case 11, even if the rotating case 11 sways during centrifugal extraction, Only by contacting the rotating case 11 with the cushion member 29, it is possible to prevent the rotating case 11 from directly contacting the inner surface of the liquid receiving case 17, and the cushioning effect of the cushion member 29 effectively absorbs the collision sound of the rotating case 11. There is an advantage that the rotation case 11 can be prevented from being scratched due to a collision while being able to reduce the noise.

In the above embodiment, the position of the air vent hole 30 is set to the extraction nozzle.
Although it is set to the right end portion (the portion farthest from the liquid receiving case 17) of the upper wall portion 18a of 18, the upper wall portion 18a is not limited to this, and the upper wall portion is not limited to this.
It may be anywhere 18a, for example, the left end portion (a portion near the liquid receiving case 17). Even in this case, the same effect as that of the above embodiment can be expected.

Further, according to the above-described embodiment, the upper end of the rotating case 11 and the lid 21.
Although the small gap formed between and is the filtering portion 22,
For example, a large number of fine holes may be formed on the entire circumference of the side wall of the rotating case 11 and used as the filtering portion.

In addition, the present invention can be modified in various ways, such as changing the clutch mechanism 13 to, for example, an electromagnetic clutch, or applying it to a structure in which the mill function is omitted.

[Effects of the Invention] As is apparent from the above description, the present invention has the air vent hole formed in the upper wall portion of the extraction nozzle of the liquid receiving case, so that the air blown into the extraction nozzle during centrifugal extraction is vented. It is possible to let the air escape from the hole to the outside, effectively reduce the wind blowing from the outlet end of the brewing nozzle, prevent the extracted coffee liquid from being cooled by the wind, and from the outlet end of the coffee liquid. Can be prevented from being scattered around by the wind pressure and polluting the surroundings.

[Brief description of drawings]

The drawings show an embodiment of the present invention. FIG. 1 is a vertical sectional front view of the whole, and FIG. 2 is an enlarged vertical sectional front view of an extraction nozzle.
FIG. 3 is an electric circuit diagram of a main part. In the drawing, 1 is an extractor body, 2 is a bottle, 5 is a heater, and 6
Is a heating tube, 7 is a motor, 9 is a crushed body, 10 is an inner coupling, 11 is a rotating case, 12 is an outer coupling, 13 is a clutch mechanism, 15 is a coil spring, 17 is a liquid receiving case, and 22 is a filtering section. , 26 is a hot water supply arm, 27 is a hot water supply mechanism, 29 is a cushion member, 30 is an air vent, and 38 is a microcomputer.

Claims (1)

[Scope of utility model registration request] 1. A rotary case in which hot water is supplied to a rotary case containing coffee powder while the rotary case is rotated at a high speed to centrifugally extract coffee liquid, and the coffee liquid is scattered around the rotary case during centrifugal extraction. The extraction nozzle provided so as to surround the periphery of the rotating case so as to receive the coffee liquid, and the extraction nozzle provided at the bottom of the liquid reception case so as to project laterally. A coffee extractor characterized in that an air vent hole is formed in the upper wall of the coffee extractor.