KR101848310B1 - Coffee drip machine - Google Patents

Abstract

The present invention relates to a coffee drip machine, which comprises a flow rate measuring unit for measuring a flow rate of cold water to be supplied, a heating unit for heating cold water, and a control unit for heating the cold water to a predetermined flow rate And a control unit for controlling the driving of the heating unit so as to discharge the hot water of the temperature. The control unit controls the driving of the heating unit based on the flow rate of the supplied cold water so that the temperature and the flow rate of the hot water have.

Description

Coffee Drip Machine {COFFEE DRIP MACHINE}

The present invention relates to a coffee drip machine, and more particularly, to a coffee drip machine that heats cold water to produce drip coffee.

Recently, the domestic coffee market is booming, and the level of consumers for coffee is also increasing.

The domestic coffee machine market is ranked sixth in the world, with the increase in the number of home coffee groups at home enjoying a further increase in the size of the coffee market. The domestic coffee machine market is estimated to have grown by 23% over the last four years, It reaches 600 billion won.

This year's coffee market trend through the 2015 Seoul Coffee Expo is '3S (Self, Specialty, Specialist)'.

Among the 3Ss, the most prominent is the self coffee group. In other words, not only cafes but also 'home coffee', which uses the finest beans and machines to eat coffee directly at home, and 'Nomade Coffee', which enjoys coffee directly in the outdoor or office, have.

Meanwhile, the growth of 'Drip Coffee' in the domestic coffee market is remarkable.

Unlike espresso coffee, which is generally used by blending various kinds of beans, drip coffee has the advantage of blending only a small number of varieties based on a single origin to make a coffee taste suited to its own taste.

As a result, the rapidly growing domestic coffee market has recently grown into a mature market, and many of them have bought a variety of beans in accordance with their preferences and then drank them directly by dripping machine, and sales are continuously rising in the depression.

As consumers' appetites have become more sophisticated and diversified, existing large coffee shops are gradually introducing 'Hand Drip', which was enjoyed only at a private specialty coffee house.

For example, the following Patent Documents 1 and 2 disclose a coffee drip machine configuration.

Korean Patent Registration No. 10-1394520 (Announcement on May 13, 2014) Korean Patent Registration No. 10-1652754 (issued on August 31, 2016)

On the other hand, in order to realize various drip methods of the drip brew serviced by the barista, the stability of the outflow is required.

In the case of a coffee drip machine that provides such a function, there is a problem that bubbles are generated and bubbles are contained in hot water coming out from the bubbles, resulting in interruption of outflow due to bubbles.

The conventional coffee drip machine has a problem in that power for driving the heating unit is consumed and precise control is impossible as the cold water is heated by driving the heating unit irrespective of the flow rate of the cold water.

SUMMARY OF THE INVENTION An object of the present invention is to provide a coffee drip machine capable of improving the stability by preventing interruption of water outflow during implementation of a drip breeze.

It is another object of the present invention to provide a coffee drip machine which can control the flow rate and temperature of hot water to be delivered based on the fluctuation of the flow rate of the cold water.

It is still another object of the present invention to provide a coffee drip machine capable of removing bubbles contained in hot water to enhance the stability of outflow.

In order to achieve the above object, a coffee drip machine according to the present invention includes a flow rate measuring unit for measuring a flow rate of cold water supplied, a heating unit for heating cold water, and a flow rate measuring unit And a control unit for controlling the driving of the heating unit so as to heat the cold water with the calculated calorific value to discharge the hot water of the predetermined flow rate and temperature, so that the temperature and the flow rate of the hot water coming out based on the fluctuation of the cold water flow rate are constantly controlled .

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As described above, according to the coffee drip machine of the present invention, it is possible to control the temperature of the hot water and the flow rate of the hot water to be constantly controlled by controlling the driving of the heating section based on the fluctuation of the flow rate of the cold water supplied.

According to the present invention, when the supply of the cold water is stopped, driving of the heater is stopped, whereby an accident such as damage to the heater due to overheating and fire can be prevented in advance.

Particularly, according to the present invention, by supplying cold water at a constant flow rate and finely varying the flow rate of the cold water, the driving of the heating part is precisely controlled to reduce the power consumed in driving the heating part, The effect of reducing the cost can be obtained.

Further, according to the present invention, it is possible to improve the stability by preventing the break of the water outflow by dripping hot water from which bubbles have been removed after pressurizing the hot water, collecting and removing the bubbles contained in the hot water .

1 is a block diagram of a coffee drip machine according to a preferred embodiment of the present invention;
Figure 2 is a perspective view of the coffee drip machine shown in Figure 1,
3 is a perspective view of a drip nozzle,
Fig. 4 is an enlarged view of bubble rejection of the drip nozzle shown in Fig. 3,
FIG. 5 is a flowchart illustrating steps of a method for controlling a coffee drip machine according to a preferred embodiment of the present invention. FIG.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a coffee drip machine according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram of a coffee drip machine according to a preferred embodiment of the present invention, and Fig. 2 is a perspective view of the coffee drip machine shown in Fig.

As shown in FIG. 1, the coffee drip machine 10 according to the preferred embodiment of the present invention includes a flow rate measuring unit 20 for measuring a flow rate of cold water supplied through a cold water supply pipe, a heating unit 30 And a control unit 50 for controlling the driving of the heating unit 30 so as to heat the cold water at a calorific value calculated on the basis of the flow rate of the cold water measured by the flow rate measuring unit 20 to discharge hot water of a preset flow rate and temperature The flow rate and the temperature of the hot water coming out on the basis of the fluctuation of the flow rate of the cold water supplied can be regulated constantly.

In addition, the coffee drip machine 10 according to the preferred embodiment of the present invention includes a cold water supply unit 40 for supplying cold water to the flow measurement unit 20, a hot water drip unit 60 for dripping hot water into the ground coffee powder, As shown in FIG.

The main body 11 of the coffee drip machine 10 can be manufactured by applying the structure of the 3D printing apparatus, as shown in FIG.

The main body 11 is formed in a substantially rectangular parallelepiped shape and the cold water supply pipe is connected to one side of the main body 11. The other side of the main body 11 is provided with a cup support 12 and a cup- And a mounting table 13 on which a filtering device (not shown) for filling the powder is installed.

On the upper portion of the screening device, a hot water dripping part 60 for dripping hot water into coffee powder filled in the screening device may be installed.

The hot water drip portion 60 may include a drip nozzle 61 for dripping hot water.

Fig. 3 is a perspective view of the drip nozzle, and Fig. 4 is an enlarged view of bubble rejection of the drip nozzle shown in Fig.

When the hot water is discharged by heating the cold water by using the heating unit 30, the cold water supply unit 40 is supplied with cold water at about 4.5 ml / s, and the heating unit 30 heats the cold water to about 90 ° C, .

Here, as shown in FIG. 3, bubbles are generated by heat in the process of heating the cold water.

As described above, in the process of heating the cold water, a wide range of bubbles occurs from minute bubbles having a diameter of several micrometers to bubbles having a size of a few millimeters, and bubbles having a certain size or more may cause a break in the outflow.

In order to prevent such outflow, in this embodiment, by designing various types of nozzles, drip nozzles 61 are designed to compare the changes in heading to design a bubble trap type nozzle through a stepwise nozzle design process, .

That is, the drip nozzle 61 includes a pressurizing / spraying unit 62 for pressurizing and injecting hot water at a predetermined pressure, a bubble collecting unit 63 for collecting bubbles contained in hot water, and hot water from which air bubbles have been removed, And a dripping section 64 for dripping.

The pressurizing / injecting part 62 is formed at a lower end of the inflow pipe 622 and has an inlet pipe 622 formed with a diameter smaller than the diameter of the hot water supply pipe and forming an orifice 621 for increasing the pressure by pressurizing the hot water. And a jet body 624 for jetting pressurized hot water into the jetting body 623 and forming a jetting hole 623 therein.

Inside the injection body 624, a substantially triangular pyramidal injection space 625 may be formed.

The bubble trapping part 63 may include a main body 631 formed in a substantially cylindrical shape and connected to a lower end of the injection body 624.

A plurality of bubble elimination traps 632 may be formed in the main body 631 to collect and remove the bubbles contained in the hot water injected through the injection holes 623 upward.

The drip part 64 is formed in a substantially inverted triangular pyramid shape provided at the lower part of the main body 631 and a drip hole 641 for dripping hot water can be formed at the lower end of the drip part 64.

The drip nozzle 61 may be manufactured by a 3D printing method.

As described above, according to the present invention, the hot water is pressurized, the bubbles contained in the hot water are collected and removed, and the hot water from which the bubbles have been removed is dripped.

1, the flow rate measuring unit 20 includes a flow rate sensor 21 for measuring the flow rate of cold water supplied from the cold water supply unit 40 through a cold water supply pipe, and a control unit 50 for controlling the supply / And an opening / closing module 22 that opens and closes to open and close.

The signal measured by the flow sensor 21 may be transmitted to the controller 50.

The opening / closing module 22 may be provided with a valve or a switch that opens and closes only when the hot water drip operation is performed according to the control signal of the controller 50, and closes when the hot water drip is completed.

The heating unit 30 may include a heater 31 for heating the cold water and a heater driving unit 32 for driving the heater 31 according to a control signal from the control unit 50.

The cold water supply unit 40 may include a pump that pumps the cold water stored in the tank to a predetermined flow rate.

However, the flow rate of the cold water supplied from the cold water supply unit 40 fluctuates finely as the pulsation occurs due to the pumping operation of the pump.

Therefore, in this embodiment, by supplying cold water at a constant flow rate in the cold water supply unit 40 and controlling the drive of the heating unit 30 in response to the minute flow rate fluctuation of the supplied cold water, And the power required to drive the heating unit 30 can be minimized.

The control unit 50 includes a storage unit 51 for storing the duty ratio of the PWM control signal for controlling the driving of the heater 31 by the flow rate of the cold water measured by the flow rate measuring unit 20, A duty ratio calculating unit 52 for calculating a duty ratio and a signal generating unit 53 for generating a PWM control signal having a calculated duty ratio.

For example, the storage unit 51 may store a table that matches the duty ratio of the PWM control signal for each flow rate of the measured cold water.

It is needless to say that the present invention is not necessarily limited to this. It is also possible to compare the flow rate of the measured cold water with a preset reference flow rate or a reference flow rate range, calculate the duty ratio of the PWM control signal according to the comparison result, .

On the other hand, as a result of the measurement of the flow rate of the cold water, the controller 50 may control the heater 31 to stop driving in order to prevent the heater 31 from being damaged due to overheating when the supply of the cold water is stopped.

As described above, according to the present invention, the temperature and the flow rate of the hot water are controlled based on the supplied cold water flow rate variation, so that the flow rate and temperature of the hot water can be kept constant.

According to the present invention, when the cold water supply is stopped, the heater is stopped from being driven, so that the heater can be prevented from being damaged due to overheating and fire.

In the present embodiment, a main control unit for controlling the driving of the entire apparatus provided in the coffee drip machine, such as a power supply unit, a driving unit for dripping hot water in various ways by moving the drip nozzle, As shown in FIG.

Next, a method of controlling a coffee drip machine according to a preferred embodiment of the present invention will be described in detail with reference to FIG.

5 is a flowchart illustrating steps of a method for controlling a coffee drip machine according to a preferred embodiment of the present invention.

5, the controller 50 initializes each device provided in the coffee drip machine 10 and prepares an operation for dripping hot water of constant temperature and flow rate by heating the cold water.

In step S12, the cold water supply unit drives a pump provided therein to supply cold water of a predetermined flow rate to the flow rate measurement unit.

When the drip operation button provided on one side of the main body 11 is operated in step S14, the opening / closing module 22 of the flow rate measuring unit 20 is opened to supply the cold water to the heating unit, And transmits the measured signal to the controller 50. The controller 50 controls the flow rate of the cold water.

The duty ratio calculating unit 52 provided in the control unit 50 calculates the duty ratio of the PWM control signal corresponding to the flow rate of the cold water measured using the table stored in the storage unit in step S16, And generates a PWM control signal having the calculated duty ratio.

Thus, the heater driving unit 32 drives the heater 31 in accordance with the PWM control signal to heat the hot water to a preset reference heating value, thereby leaving hot water (S18).

At this time, if the supply of cold water is stopped, the controller 50 can control to stop driving the heater 310 to prevent damage due to overheating.

When the hot water is discharged by driving the heater 31 through the above process, the drip nozzle 61 provided in the hot water dripping unit 60 pressurizes the hot water to a preset pressure and discharges the air bubbles And the hot water from which the bubbles have been removed is dripped with the coffee powder filled in the sieving device (S22).

In step S24, the control unit 50 checks whether the hot water drip is completed, and controls the steps S12 to S24 to be repeated until the hot water drip is completed.

If it is determined in step S24 that the hot water drip is completed, the control unit 50 controls the opening / closing module 22 to close and stops the operation of each device provided in the coffee drip machine 10, and then ends the process.

Through the above-described process, the present invention can control the temperature and flow rate of the hot water to be controlled constantly by controlling the heating unit based on the fluctuation of the flow rate of the cold water supplied.

Although the invention made by the present inventors has been described concretely with reference to the above embodiments, the present invention is not limited to the above embodiments, and it goes without saying that various changes can be made without departing from the gist of the present invention.

The present invention is applied to a coffee drip machine technique that controls the heating section based on the flow rate of cold water supplied to constantly control the temperature and flow rate of the hot water coming out.

10: Coffee drip machine 11: Body
12: cup base 13: mounting base
20: Flow measuring part 30: Heating part
31: heater 32: heater driving part
40: cold water supply unit 50:
51: storage part 52: duty ratio calculation part
53: signal generating unit 60: hot water drip unit
61: drip nozzle 62:
621: Orifice 622: Inflow pipe
623: the injection hole 624: the injection body
625: injection space 63: bubble trapping part
631: main body 632: air bubble elimination trap
64: drip portion 641: drip ball

Claims (10)

A flow rate measuring unit for measuring a flow rate of cold water supplied,
A cold water supply unit for supplying cold water of a predetermined flow rate to the flow rate measuring unit,
A heating unit for heating the cold water,
A drip nozzle for dripping hot water heated in the heating part to the ground coffee powder and
And a control unit for controlling the driving of the heating unit so as to heat the cold water at a calorific value calculated based on the flow rate of the cold water measured by the flow rate measuring unit and to discharge hot water of a preset flow rate and temperature
The temperature and flow rate of the hot water coming out on the basis of the fluctuation of the flow rate of the cold water are controlled to be constant,
The control unit controls the driving of the heating unit in response to the fluctuation of the flow rate of the cold water caused by the operation of the pump provided in the cold water supply unit,
The drip nozzle includes a pressurizing / spraying unit for pressurizing and spraying the hot water at a preset pressure,
A bubble collecting part for collecting the bubbles contained in the hot water, and
And a drip portion for dripping the bubbled hot water into the coffee powder,
Wherein the pressurizing jet portion includes an inlet pipe through which an orifice is formed to pressurize the hot water to increase pressure,
And a jet body provided at a lower end of the inflow tube and spraying pressurized hot water into the inside of the inflow tube,
The bubble collector includes a main body connected to a lower end of the injection body,
And a bubble elimination trap provided inside the main body for collecting bubbles contained in hot water injected through the injection holes and discharging the bubbles upward to remove the bubbles,
And a drip hole for dripping hot water is formed in a lower portion of the main body. delete delete The method according to claim 1,
The flow rate measuring unit may include a flow rate sensor for measuring the flow rate of the cold water supplied through the cold water supply pipe
And an open / close module for opening / closing the cold water supply or the cold water according to a control signal of the control unit,
The heating unit includes a heater for heating the cold water,
And a heater driving unit for driving the heater according to a control signal of the control unit. 5. The method of claim 4,
Wherein the control unit includes a storage unit for storing a duty ratio of a PWM control signal for driving the heater of the heating unit by the flow rate of the cold water measured by the flow measuring unit,
A calculation unit for calculating a duty ratio of the control signal using a table stored in the storage unit;
And a signal generating unit for generating a PWM control signal having a duty ratio calculated by the calculating unit,
And stops the driving of the heater when the cold water supply is stopped. delete delete delete delete delete

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