KR920004261B1 - Centrifugal brewing type coffee maker - Google Patents

Abstract

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Description

Coffee extractor

1 is a longitudinal cross-sectional view of the whole.

2 is a bottom view of the heating plate portion.

3 is an electrical circuit diagram of a main part.

4 is an operation explanatory diagram showing the relationship between the detection temperature of the thermistor and the operation of the motor and the heater.

* Explanation of symbols for main parts of the drawings

1: extractor body 2: bottle

5 heater 6 heating plate

7: motor 9: grinding body

10 inner coupling 11 case

12: outer coupling 13: clutch mechanism

15: coil spring 17: outer case

22: filtration unit 26: hot water pipe

27: hot water supply mechanism 29: thermistor (hot water start detection device)

38: microcomputer (operation control device)

The present invention relates to a so-called centrifugal coffee extractor.

In general, shortening the contact time between hot water and coffee powder in extracting coffee beans does not extract ingredients (for example, bitter taste) from coffee powder, making coffee more delicious.

Recently, so-called centrifugal coffee extractors have been designed to realize this.

The coffee extractor is provided with a motor in the extractor body, and connected to and supported by a case for extracting the coffee liquid through a coupling on an upper end of the rotating shaft which protrudes above the motor. The outer circumference of the case includes a filtration unit for extracting coffee. It is installed.

At the time of extraction, by rotating the case by driving the motor, the hot water supplied in the case is rapidly passed through the coffee beans in the case by the rotating centrifugal force, thereby making it possible to extract the coffee liquid from the outer circumference of the case.

However, since it takes some time until the hot water is started in the case after the electric power is supplied to the heater of the hot water supply device, as is generally considered, when the electric power to the heater of the hot water supply device and the power to the motor are simultaneously started, Since the case rotates on the highway, there is a disadvantage in that a large noise is generated due to vibration.

In this case, even though the water boiling time is predicted, for example, the motor is started late for a certain time by a timer, the actual boiling water generation time is greatly influenced by the water temperature or room temperature. It is impossible to make sure the timing, and the above mentioned disadvantage cannot be completely solved.

In addition, when the start time of rotation of the case by the timer is more than necessary later than the start time of hot water supply, the original advantage of centrifugal extraction is quickly eliminated, and the flavor of the extracted coffee liquid is dropped.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a machine for extracting coffee liquid using a centrifugal force, wherein the case can be rotated in accordance with the start of hot water supply to the case, thereby minimizing noise. A centrifugal extraction method provides a coffee extractor that does not harm the original benefits.

The coffee extractor of the present invention accommodates coffee powder therein and has a filtration unit for extracting coffee liquid in the outer circumference, a hot water supply mechanism for supplying hot water in the case, and rotating the case to rotate the hot water by rotating centrifugal force. A motor for extracting coffee extract from the filtration unit through a coffee powder, comprising: a hot water supply start detecting device for detecting the start of hot water supply to the case; and a hot water start detection device using the hot water supply start detecting device. Therefore, the operation control device for starting the motor to rotate the case is installed.

Whether or not hot water supply to the case is started from the hot water supply mechanism is detected by the hot water supply start detection device, and based on the detection result, the operation control device starts the motor to start rotation of the case.

Accordingly, the start time of rotation of the case corresponds to the start time of the hot water supply.

EXAMPLE

Hereinafter, an embodiment in which the present invention is applied to a coffee extractor having a mill (mill) function will be described with reference to the drawings.

"1" is an extractor main body, and at the bottom thereof, a mounting plate 3 on which a bottle 2 for storing coffee liquid is placed is provided.

In the heating tube 4 provided on the lower side of the mounting plate 3, the heater 5 and the heating tube 6 are provided in close proximity to each other (see FIG. 2). In this heating tube 6, the water storage tank 6 Water is supplied from (not shown).

On the other hand, in the extractor main body 1, the motor built-in chamber 1a is formed in the left side of the bottle 3, and the longitudinal-shaft motor 7 is built in this motor built-in chamber 1a.

This motor 7 is a commutator motor whose rotation direction is comprised so that reverse rotation is possible.

The inner coupling 10 for driving the pulverized body 9 mentioned later is attached to the upper end of the rotating shaft 8 which protrudes above this motor.

The outer coupling 12 for driving the case 11, which will be described later, is fitted to the outer circumference of the inner coupling 10 for driving the pulverized body 9 so as to be able to rotate relatively freely.

"13" is a clutch mechanism for selectively transmitting the rotational force of the motor 7 to the outer coupling 12. As shown in FIG.

The clutch mechanism 13 is of the same type as that used to selectively rotate the rotating tub of the automatic washing machine, which is a one way clutch mechanism that transmits motion in only one known direction.

This clutch mechanism 13 has a coil spring 15 wound around the cylindrical base member 14 and the lower side of the outer coupling 12, which are fitted and fixed to the rotary shaft 8, and that of the coil spring 15 The lower end is fixed to the cylindrical base member 14 with the fixing pin 16.

Here, the clutch mechanism 13 is composed of a frictional one-way clutch, and when the motor 7 rotates forward, the coil spring 15 is released from the outer coupling 12 so that the rotational force of the motor 7 is transferred to the outer coupling 12. Is not transmitted and only the inner coupling 10 is rotationally driven.

On the other hand, when the motor 7 rotates in reverse, the coil spring 15 is further wound on the outer coupling 12 by the frictional force, and both couplings 10 and 12 are integrally rotated.

The outer case 17 is detachably attached to the upper part of the clutch mechanism 13, and the extraction nozzle 18 formed at the bottom right of the outer case 17 faces the open position of the bottle 2. .

In the outer case 17, a case 11 having a function of pulverizing coffee beans and extracting coffee liquid is built-in, and a cylindrical connecting member 19 formed downward at the bottom of the case 11. ) Is connected to the outer coupling 12 so as to support the case 11.

In this case, both the inner circumferential surface of the cylindrical connecting member 19 and the outer circumferential surface of the outer coupling 12 are formed so that unevenness occurs, and the two are engaged so that the two do not slip together.

In addition, in the case 11, the pulverized body 9 is installed so that it can rotate freely, and the support shaft 20 of this pulverized body 9 is fitted in the inner coupling 10, and is connected.

On the other hand, the open part of the upper surface of the case 11 is covered with a dome-shaped lid 21 having a hot water inlet 21a at the center, and is 0.2 mm between the lid 21 and the upper end of the case 11, for example. A gap of a degree is formed uniformly, and this gap is used as the filtration part 22.

The inner circumferential surface of the case 11 is formed in the form of a tapered surface of which the upper side is opened in order to raise the boiling water (coffee liquid) toward the filtration part 22 by the rotation centrifugal force.

Here, the lid 21 is fixed by engaging the engaging projection 23 formed in the lid 21 to the engaging groove 24 formed in the upper edge of the case 11.

In addition, a lid 25 having a funnel-shaped hot water supply port 25a at the center is covered in the open portion of the upper surface of the outer case 17, and a hot water supply port 25a of the lid 25 is located at the bottom of the lid 21. Is inserted into the hot water supply port 21a.

The hot water supply pipe 26 connected to the heating tube 6 described above is rotatably installed above the lid 25, and the hot water outlet 26a of the hot water supply pipe 26 is connected to the lid 25. It is comprised so that it may be located just above a hot water supply port 25a.

The hot water supply mechanism 27 is comprised of this hot water supply pipe 26, the heating tube 6, and the heater 5.

On the other hand, "28" is a lid that covers the top of the hot water supply pipe (26).

As shown in FIG. 2, a thermistor 29, which is a hot water start detection device, is provided at the inlet portion 6a of the water storage tank side of the heating tube 6, and the temperature of the heating tube 6 is provided by the thermistor 29. Is detected, the boiling start of the water in the heating tube 6, that is, the start of hot water supply to the case 11, is detected.

The reason why the thermistor 29 is installed in the inlet portion 6a of the heating tube 6 in this embodiment is to perform not only the hot water start detection but also the hot water end detection.

Next, the configuration of the electric circuit of the main part will be described with reference to FIG.

In order to reverse the energization directions of the field coils 7a and 7b and the armature coil 7c of the motor 7, two conversion switches 31 and 32 are provided, and the field coils 76 and A forward turn switch 33 is provided between the power supply line 34, and a reverse turn switch 36 is provided in series with the connection resistor 35 in parallel with the forward turn switch 33.

At the time of the grinding operation, the movable contact 31a of the changeover switch 31 is in contact with the fixed contact 31b, and the movable contact 32a of the changeover switch 32 is in contact with the fixed contact 32b, and the switch for turning only once ( 33) is turned on, and thus the motor 7 rotates forward at, for example, 10000 rpm.

On the other hand, during the extraction operation, the movable contact 31a of the conversion switch 31 is converted to the fixed contact 31c side, and at the same time, the movable contact 32a of the conversion switch 32 is converted to the fixed contact 32c, and the switch for reverse rotation is used. 36 is turned on, and thus the motor 7 is reversely rotated at 5000 rpm, for example.

The reason why the rotational speed at the time of reverse rotation is lowered to half of the forward rotational speed is because the voltage applied to the motor 7 decreases due to the presence of the resistor 35.

&Quot; 37 " is a heater switch installed in the conduction path to the heater 5. In FIG.

The conversion operation of each of the switches 31, 32, 33, 36, 37 is controlled by the microcomputer 38, which is an operation control device.

Here, the microcomputer 38 starts to generate hot water by energizing the heater 5 (turning on the heater switch 37) after the end of the grinding operation, and heating based on the detection temperature of the thermistor 29. When the boiling start (water supply start) of the water in the pipe 6 is detected, it is controlled to rotate the motor 7 (the reverse rotation switch 36 is turned on).

4 is an operation explanatory diagram showing the detection temperature of the thermistor 29, the rotational direction of the motor 7, and the energization period for the heater 5.

Next, the operation of the above configuration will be described.

The procedure of extracting the coffee liquid is first set as shown in FIG. 1 by supplying water into the water storage tank and simultaneously placing coffee beans in the case 11.

Subsequently, when the pulverization operation is started, the movable contact 31a of the changeover switch 31 is brought into contact with the fixed contact 31b by the microcomputer 38, and the movable contact 32a of the changeover switch 32 is fixed at the same time. The motor 7 rotates forward at, for example, 10000 rpm by being in contact with 32b and turning on the switch 33 for exclusive use.

As the motor 7 rotates forward, the pulverized body 9 is rotated to crush the coffee beans in the case 11.

During this grinding operation, since the rotational direction of the motor 7 is the direction in which the coil spring 15 of the clutch mechanism 13 is released, the coil spring 15 is lifted from the outer circumferential surface of the outer coupling 12 of the motor 7. No rotational force is transmitted to the outer coupling 12 so that the case 11 remains almost stationary.

After the pulverization operation is executed only for a set time (e.g., 30-40 seconds), the rotary dedicated switch 33 is turned off by the microcomputer 38, and the motor 7 is once stopped. Then, the heater switch 37 is turned on to start energization of the heater 5.

Accordingly, the water supplied from the reservoir tank to the heating tube 6 is heated through the heating tube 6.

At that time, the temperature of the heating tube 6 is detected by the thermistor 29, and the water in the heating tube 6 boils at the time t ₁ (see FIG. 4) when the detection temperature becomes 100 degreeC or more, for example. The boiling pressure is gradually raised to the hot water supply pipe 26 by the boiling pressure, and the hot water outlet 26a is introduced into the case 11 through the hot water supply ports 25a and 21a of the two lids 25 and 21. It is hot water from.

In this embodiment, the movable contact (31a) a stationary contact (31c) of the switch (31) by at the point of time t _1, i.e., hot water supply start time is more than the detection temperature 100 ℃ of the thermistor 27 to the microcomputer 38 At the same time, the movable contact 32a of the changeover switch 32 is converted to the fixed contact 32c, and the reverse rotation-only switch 36 is turned on.

Accordingly, the motor 7 is rotated back at, for example, 5000 rpm.

Since this rotation direction is the direction in which the coil spring 15 of the clutch mechanism 13 is wound, the coil spring 15 is wound around the outer circumferential surface of the outer coupling 12 so that the rotational force of the motor 7 is coupled to the outer coupling. Also to (12).

Accordingly, the inner and outer both couplings 10 and 12 are integrally rotated so that the case 11 is integrally rotated at high speed with the pulverized body 9.

In this manner, the case 11 is also started to rotate almost simultaneously with the start of hot water supply, and immediately after the start of rotation, the coffee powder A in the case 11 is uniformly dispersed toward the inner circumferential wall as shown in FIG. It becomes the state which stuck to this inner peripheral wall uniformly.

In this state, as described above, the hot water is discharged from the hot water supply pipe 26 to the center portion of the case 11 and falls on the pulverized body 9 or the bottom surface of the case 11.

At that time, the hot water dropped on the pulverized body 9 is influenced by the centrifugal force by the rotation of the pulverized body 9 and scattered to the surroundings to penetrate into the coffee powder A.

In addition, the hot water dropped on the bottom surface of the case 11 penetrates into the coffee powder A along the inner bottom surface by centrifugal force due to the rotation of the case 11. The hot water penetrated into the coffee powder (A) passes through the coffee powder (A) relatively quickly by the rotary centrifugal force while extracting the extract from the coffee powder (A) and reaches the inner circumferential wall of the case (11). It rises along the tapered surface of its inner circumferential wall and is scattered from the narrow gap between the upper end of the case 11 and the lid 21, ie from the filtration part 22, and inside the outer case 17. Splashes toward the circumferential wall.

Then, the coffee liquid splashed from the filtration unit 22 and splashed on the outer case 17 flows downward along the inner circumferential wall thereof, and finally is stored away from the extraction nozzle 18 into the bottle 2.

And storing water disappears is heated the water in the tank, the temperature of the heater tube 6 is rapidly increased the detection temperature by the thermistor 29, for example at the point of time t ₂ abnormal 140 ℃ the microcomputer 38, the motor 7 and the Extraction is complete | finished by turning off the heater 5.

According to the embodiment described above, the start of hot water supply is detected by the thermistor 29, and based on the detection result, the microcomputer 38 starts to rotate the case 11 in accordance with the start of hot water supply. It is possible to solve the inconvenience of generating noise by rotating at high speed without need.

In addition, since the start of hot water supply and the start of rotation of the case 11 are almost simultaneously, for example, the contact time between the hot water and coffee powder is too long, unlike when the start of rotation of the case 11 is delayed more than necessary by the timer. Since it can be prevented from being lengthened, the flavor of the extracted coffee liquid can be increased without harming the original advantage (shortening the contact time between the hot water and the coffee powder).

In the above embodiment, the motor 7 (case 11) is configured to be rotated immediately when the detection temperature of the thermistor 29 reaches 100 ° C., but the case 11 is delayed for example about 4-5 seconds after detection. It may be configured to start the rotation of.

Even in this case, since the delay time from the start of hot water supply to the start of rotation of the case 11 is short and substantially within the range that the hot water start and the start of rotation are performed at the same time, there is no problem.

In addition, although the thermistor 29 was provided in the inlet part 6a of the heating tube 6 in the said Example, other parts, for example, the outlet part 6b of the heating tube 6, the hot water supply pipe 26, Or it may be provided in the riser tube 6c from the heating tube 6 to the hot water supply tube 26.

In addition, in the above embodiment, the hot water supply start detection device is configured by thermistor 29 so as to determine the start of hot water supply by detecting the temperature. For example, the steam sensor for detecting the steam ejected from the hot water supply pipe 26 is the hot water supply start detection device. It is possible to determine the start of hot water supply based on the detection of steam.

In addition, according to the above embodiment, although the narrow gap formed between the upper end of the case 11 and the lid 21 is used as the filtration part 22, for example, a minute hole is formed over the entire circumferential wall of the case 11. You may form many and it may be a filtration part.

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 a configuration in which the push function is omitted.

As can be seen from the above description, the hot water is started by the hot water start detection device, and the case is started on the condition that the hot water is started under the condition of detecting the hot water. Discomfort can be eliminated.

In addition, the start of rotation of the case can be almost coincided with the start of hot water supply.For example, the contact time between the hot water and coffee powder is prevented from becoming too long, unlike when the start of rotation of the case is more than necessary later than the start of the hot water. As a result, the flavor of the extracted coffee liquid can be increased without harming the original advantages of the centrifugal extraction method (shortening the contact time between the hot water and the coffee powder).

Claims (1)

Coffee beans extracting liquid filtration unit 22 in the circumference, the case 11 is installed to be rotatable, the crushed body 9 is rotatably installed in the case to grind coffee beans, and ground coffee beans At the same time, the grinding body 9 is rotated and the motor 7 for rotating the case 11 during the extraction of the coffee liquid, and the electric heater and the heating tube are disposed in the main body, and the water supplied to the heating tube is heated. A coffee extractor having a hot water supply mechanism 27 for supplying it into the case 11 and detecting the temperature of the hot water supply mechanism 27 to detect the start time of hot water supply to the case 11 (the hot water supply start detection device). (29) and the hot water supply start detection device 29 is provided with an operation control device for starting the motor (7) to rotate the case 11 when the hot water supply from the hot water supply mechanism 27 is detected. Coffee extractor.

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