JPS5825967Y2 - coffee liquid extraction equipment - Google Patents

Description

[Detailed explanation of the invention] [Technical field of the invention] The invention is applicable to not only high-temperature hot water but also relatively low-temperature (45 to 70
This invention relates to a coffee liquid extracting device that can extract coffee liquid using hot water at ℃).

[Technical background of the invention]

Cold brew coffee drip is known to have high transparency and excellent taste and aroma.

Therefore, the applicant of the present invention has developed a coffee liquid extraction device capable of performing low-temperature extraction substantially equivalent to cold-brewed coffee drip, as disclosed in, for example, Japanese Utility Model Application No. 5805/1983.

[Problems with the background technology] By the way, when extracting coffee liquid at a low temperature, the temperature of the hot water, the amount of extraction, and the extraction time have a great effect on the taste and aroma of the coffee liquid, so these extraction conditions should be kept as constant as possible. Something is desired.

However, in conventional low-temperature coffee liquid extraction equipment,
For example, as seen in the above-mentioned Utility Application No. 50-5805,
(1) Since a nichrome wire heater or a sheathed wire heater is used as a heat source for extracting coffee liquid, the output of the heater changes significantly due to input changes due to voltage fluctuations. It is difficult to control strictly.

Therefore, there is a problem in that it is difficult to obtain a high-quality low-temperature coffee extract using the heater.

In addition, when using a sheathed wire heater or a nichrome wire heater, when there is no water in the aquarium and it dries up, there is a risk of the reheater breaking, which will cause the temperature not only in the water passage but also in the surrounding area to be extremely high. It turns out.

In order to eliminate such inconveniences, a safety device is required, but the safety device has drawbacks such as an increase in the number of parts and an increase in manufacturing time, which lead to higher costs.

[Purpose of invention]

This invention was developed based on these circumstances, and its purpose is to be able to switch between high-temperature extraction and low-temperature extraction according to preference, and to prevent the effects of input changes due to voltage fluctuations during low-temperature extraction. It is an object of the present invention to provide a coffee liquid extracting device that can stably extract low-temperature coffee liquid, prevent danger during dry-up, and prevent high costs.

[Summary of the idea]

That is, the present invention includes a water tank, a water passage communicating with the water tank, a backflow prevention device installed in the middle of the water passage and opening only in the direction in which the water in the tank flows out into the water passage, and A low-temperature heating device for extracting low-temperature coffee liquid that locally heats and boils water in a water passage using a positive temperature coefficient thermistor as a heat source, a hot water pipe communicating with the downstream side of this low temperature heating device, and a hot water pipe connected to the hot water pipe. A coffee liquid storage container placed below the discharge port and equipped with a filter device on the upper part; a hot plate provided on a stand on which the coffee liquid storage container is placed and to which the midway part of the hot water supply pipe is attached; A high-temperature heating device is attached to the hot plate and is switchable with the low-temperature heating device, and is capable of heating the hot plate and hot water pipes with a larger calorific value than the low-temperature heating device; Equipped with a thermal switch that closes to energize the high-temperature heating device when the temperature of the hot plate falls below a predetermined temperature, and opens to cut off energization to the high-temperature heating device when the temperature exceeds a predetermined temperature. This is a coffee liquid extraction device characterized by the following.

[Example of idea]

An embodiment of the present invention will be described below with reference to the drawings.

In the figure, 1 is a casing with a recess 2 formed on one side.
A water tank 4 having a lid 3 on the top is provided inside the casing 1.

The lower part of this water tank 4 is covered with the casing 1,
This casing 1 has a base portion 5 on the lower right side in the drawing.

Connected to the bottom of the water tank 4 is a communication pipe 6 that is bent into an abbreviated shape and forms a part of the water passage A, and at the boundary between the communication pipe 6 and the water tank 4 is a pipe that communicates between the two. A valve chamber T is provided, and a valve body 8 is installed in the valve chamber 7 to constitute a backflow prevention device 9.

Further, the communication pipe 6 communicates with a hot water supply pipe 11 forming a part of the water passage A via a low temperature heating device 10 for extracting low temperature coffee liquid.

This hot water supply pipe 11 is curved and installed inside the hot plate 12 provided on the platform 5, and its tip extends upward within the space between the outer surface of the water tank 4 and the inner surface of the casing 1, It has a discharge port 13 that is bent in an inverted U shape at the top and opens downward.

A high-temperature heating device 14 for extracting high-temperature coffee liquid using a sheathed wire heater or a positive temperature coefficient thermistor as a heat source is embedded in the hot plate 12, and this high-temperature heating device 14 connects the hot water pipe 11 and the hot plate 12. can be heated.

Further, a heat transfer plate 15 is provided on the upper surface of the heat plate 12, and this heat transfer plate 15 constitutes the upper surface of the platform 5.

Furthermore, a high temperature heating device 14 is provided on the bottom surface of the hot plate 12 during heat retention.
A thermal switch 16 is attached to control the energization to.

On the other hand, a container 18 made of heat-resistant glass having a handle 17 is inserted into and taken out from the recess 2 located above the platform 5, and the container 18 is placed on the heat transfer plate 15. It has become.

A filter device 19 is removably provided at the upper opening of the container 18 .

This filter device 19 includes a bean storage device 20 having a large number of small holes 20a on the bottom surface of which the ground coffee bean powder cannot pass through, and a bean storage device 20 that is removably provided in the upper opening of the bean storage device 20. It is composed of a cap-shaped lid body 21.

The top of the lid 21 is open, and a diffusion plate 21a is provided below the opening and facing the opening.

The opening of this lid 21 is located directly below the discharge port 13 of the hot water supply pipe 11 when the filter device 19 and container 18 are set in the state shown in FIG.

The low-temperature heating device 10 has a configuration shown in detail in FIGS. 2 and 3, and 22 is a positive characteristic thermistor J (
P, T, C).

Electrodes 23a and 23b having approximately the same area as these surfaces are arranged on the upper and lower surfaces of the positive temperature coefficient thermistor 22, and these electrodes 23a and 23b are connected to lead wires (not shown).

A thin elastic electrical insulator 24 is superposed on the upper electrode 23a, and an electrically insulating cushion body 25 made of heat-resistant rubber or the like is superimposed below the lower electrode 23b.

A heating element 26 having good thermal conductivity, such as aluminum, is superimposed on the electrical insulator 24.

This heating body 26 includes a base portion 26a that is superimposed on the electrical insulator 24, and leg portions 26 that protrude from the lower surface of this base portion 26a.
b... and a protrusion 26c extending integrally above the base 26a, and a water flow hole 27 is formed in the protrusion 26c.

Backing tubes 28a and 28b are provided on both sides of the protrusion 26c, and these backing tubes 28a and 28b communicate with the water flow hole 27, respectively.

Further, one backing tube 28a is connected to the communication pipe 6, and the other backing tube 28b is connected to the hot water supply pipe 1.
1.

Therefore, the communication pipe 6, the water flow hole 27, and the hot water supply pipe 11 constitute the water passage A.

Note that the backing tubes 28a and 28b are presser plates 29.
a.

29b, are integrally fixed to the heating body 26 via screws 30...k and nuts 31...

Furthermore, the lower surface of the cushion body 25 is in contact with the inner bottom surface of the heating case 32.

That is, the heating case 32 is made of a heat-resistant, electrically insulating material such as porcelain, and has a chamber 32a in the center thereof in which the positive temperature coefficient thermistor 22 is housed, and the heating body 2 is surrounded by the chamber 32a.
The recesses 32b... in which the leg portions 26b... of No. 6 intervene.

In the chamber 32a, an upper electrode 23a, a positive temperature coefficient thermistor 22, a lower electrode 23b, and a cushion body 25 are placed.
These are stored in such a way that they are polymerized.

Then, the leg portions 26b of the heating body 26 are placed in the recesses 32b...
..., and tighten the plate 33 on the bottom surface of the heat case 32 to tighten the heating body 26 and the heat case 3.
2 and tightening are constructed by tightening the plate 33 with screws 34 and assembling the plate 33 integrally.

In addition, in order to prevent damage to the heat case 32 due to excessive tightening between the heating body 26 and the plate 33, the leg portions 26b and 33 are tightened.
The protrusion length of ... is set appropriately.

Note that the low-temperature heating device 10 and the high-temperature heating device 14 can be selectively switched by a changeover switch (not shown).

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

To add coffee, first, ground coffee beans are placed in the bean container 20 of the filter device 19, and the filter device 19 and container 18 are set in the state shown in FIG.

Then, a predetermined amount of water is poured into the water tank 4.

In this state, if a relatively low-temperature coffee liquid is desired, the selector switch is operated to energize only the low-temperature heating device 10.

Then, the water put into the water tank 4 passes through the backflow prevention device 9 and enters the communication pipe 6, the water flow hole 27 of the heating element 26, and the inside of the hot water supply pipe 11, that is, the water passageway A.

Since the PTC thermistor 22 of the low temperature heating device 10 is energized, it generates heat, and this heat is transferred to the heating body 26 .

The heating body 26 has a water hole 2 formed in its protrusion 26c.
1 to heat the water in the water flow hole 27.

Therefore, the water in the water flow hole 21 is heated and boils, generating bubbles and increasing the pressure in the water passage A.

This pressure increase pushes up the valve body 8 of the backflow prevention device 9 and closes the passage to the water tank 4.

The hot water in the water passage A passes through the hot water supply pipe 11 and is forced out from the discharge port 13.

When this hot water flows out, the pressure in the water hole 27 decreases, the valve body 8 descends, and water enters the communication pipe 6 and the water hole 27 from the water tank 4 again.

The water that has entered is heated by the low-temperature heating device 10 in the same manner as described above, and flows out from the discharge port 13 due to the steam pressure at the time of boiling.

By repeating this action, the water in the aquarium intermittently flows out from the outlet 13, but the water temperature at this time is about 45-70°C.
The temperature is relatively low between ℃ and ℃.

This is because the low-temperature heating device 10 has a relatively small heating internal volume and generates a small amount of heat.

The water (hot water) that has flown out from the discharge port 13 in this way is passed through the upper opening of the lid 21 of the filter device 19 to the diffusion plate 2.
The beans flow into the bean storage container 20 while being diffused by the bean container 1a.

The hot water penetrates the ground coffee beans in the bean storage container 20, and coffee liquid is extracted.

When the coffee liquid passes through the small hole 20a in the bottom of the bean container 20, it is separated from the coffee beans and dripped into the container 18.

In this way, when the water in the water tank 4 is exhausted and the desired amount of coffee liquid is obtained, the changeover switch (not shown) is operated to stop energizing the low-temperature heating device 10 and at the same time energizing the high-temperature heating device 14. .

As a result, the high-temperature heating device 14 generates heat, and the container 18
The coffee liquid inside is heated and kept at an appropriate keeping temperature controlled by a thermal switch 16.

Furthermore, when extracting coffee liquid using hot water, the selector switch may be set so that the high temperature heating device 14 is energized from the beginning.

In this way, the water that has entered the water passage A is heated in the hot plate 12 by the large calorific value of the high-temperature heating device 14 and over a wide range, and therefore boils violently and flows out from the discharge port 13 due to this vapor pressure. The hot water is close to 100 degrees Celsius, and coffee liquid can be extracted at high temperatures.

After the extraction is completed, the heating operation is started.

According to this example, high temperature and relatively low temperature (45-7
Since the coffee liquid can be extracted using hot water at two different temperatures (0°C), it is easy to obtain the desired taste, and a coffee liquid with the same taste as cold brew coffee can be obtained in a relatively short time.

By the way, in the case of the above embodiment, since a positive temperature coefficient thermistor is used in the low temperature heating device 10, it is hardly affected by voltage fluctuations.

In other words, as shown by the solid line in FIG. 4, the positive temperature coefficient thermistor provides a stable input with less input change due to voltage changes than other heaters, such as the sheathed wire heater shown by the broken line.

Furthermore, if a positive temperature coefficient thermistor is used, as shown by the solid line in FIG. 5, the change in flow rate due to voltage changes is smaller than that of the sheathed wire heater shown by the broken line, and the extraction amount and extraction time are therefore stable.

Therefore, when you want to extract coffee liquid at a particularly low temperature (45 to 70 degrees Celsius), the temperature, extraction amount, and extraction time are stable, so there is no risk of the taste or aroma changing during the process, and it is extremely easy to extract. A delicious and fragrant coffee liquid can be obtained.

In addition, the resistance value of a positive characteristic thermistor rapidly increases as the temperature rises and stabilizes near the cue point, so when there is no water in the water tank 4, the current automatically decreases, thereby preventing excessive temperature rise. is prevented and the danger is eliminated.

Moreover, since this property is possessed by the positive characteristic sensor itself, other safety devices are not required and the cost is low.

It is preferable that the positive temperature coefficient thermistor and the electrode be assembled into one piece by brazing, soldering, conductive adhesive, etc., but the method of assembly can be selected as appropriate.

Furthermore, if a positioning structure for a positive temperature coefficient thermistor is formed on the cushion body, the heater case becomes unnecessary and the number of parts can be reduced, but these can be changed as appropriate in implementation and are not limited to the examples. do not have.

[Effect of idea]

The present invention is constructed as described above, and includes a water tank, a water passage communicating with the water tank, and a backflow prevention device that is provided in the middle of the water passage and opens only in the direction in which the water in the tank flows out into the water passage. A device, a low-temperature heating device installed in the middle of the water passage for locally heating and boiling the water in the water passage, a hot water pipe communicating with the downstream side of the low-temperature heating device, and a coffee liquid storage container are mounted. A hot plate is installed on the table and has the middle part of the hot water pipe attached to it, and the hot plate is attached to the hot plate and can be switched freely with the low temperature heating device to heat the hot plate and hot water pipe with a larger calorific value than the low temperature heating device. Since it is equipped with a high-temperature heating device that heats and boils water, by switching between these high and low heating devices, you can select high-temperature extraction or low-temperature extraction according to your preference.

In addition, a low-temperature heating device for extracting low-temperature coffee liquid is provided, which locally heats and boils the water in the water passage using a positive temperature coefficient thermistor as a heat source, which is installed in the middle of the water passage. is used as a heat source, and since positive temperature coefficient thermistors have little input change due to voltage changes, hot water temperature can be controlled with high precision.

That is, in the case of low-temperature extraction, it is possible to stabilize the temperature of hot water supply, the amount of extraction, and the extraction time, which greatly affect the quality of flavor.

In addition, since the resistance value of a positive temperature coefficient thermistor increases as the temperature rises, it is possible to self-control the non-conducting state during dry-up, preventing failures and dangers, and reducing costs because no other safety devices are required. It doesn't get expensive either.

Furthermore, according to the present application, the heat of the high-temperature heating device is transmitted to the coffee liquid in the coffee liquid storage container via a hot plate provided on the stand on which the coffee liquid storage container is placed, and the coffee liquid is kept warm. When the temperature of the hot plate falls below a predetermined temperature, the button is closed to supply electricity to the high-temperature heating device, and when the temperature exceeds a predetermined temperature, the button is opened to cut off the electricity to the high-temperature heating device. Equipped with a switch, coffee liquid extracted with a low-temperature heating device can be kept warm using a high-temperature heating device with a large calorific value, so it can be kept warm with sufficient heat even during low-temperature extraction with a small calorific value. And since the high-temperature heating device doubles as a heat-retaining device during low-temperature extraction,
This has excellent practical effects, such as increasing the utility value of high-temperature heating equipment.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Fig. 1 is a sectional view schematically showing a coffee liquid extracting device, Fig. 2 is an enlarged sectional view of part W in Fig. 1, and Fig. 3 is a side view thereof. Figure 4 is a characteristic diagram showing input changes due to voltage fluctuations between a positive temperature coefficient thermistor and a sheathed wire heater, and Figure 5 is a characteristic diagram showing flow rate changes due to voltage fluctuations between a positive temperature coefficient thermistor and a sheathed wire heater. be. 4... Water tank, 5... Stand, 9... Backflow prevention device,
10...Low temperature heating device, 11...Hot water pipe, 12...
・Hot plate, 13...discharge port, 14...high temperature heating device,
16... Thermal switch, 18... Container, 19...
Filter device, 22...Positive characteristic thermistor, A...
Waterway.

Claims (1)

[Scope of utility model registration request] a water tank, a water passage communicating with the water tank, a backflow prevention device provided in the middle of the water passage that opens only in the direction of allowing the water in the tank to flow out into the water passage; Local heating and
A low-temperature heating device for boiling low-temperature coffee liquid extraction, a hot water pipe communicating with the downstream side of the low-temperature heating device, and a coffee liquid storage located below the outlet of the hot water pipe and having a filter device on the top. a container, a hot plate provided on the stand on which the coffee liquid storage container is placed and to which the midway part of the hot water supply pipe is attached; and a hot plate attached to the hot plate which is switchable with the low temperature heating device and which is connected to the low temperature heating device. A high-temperature heating device that can heat the hot plate and the hot water pipe with a large amount of heat, and a high-temperature heating device that is attached to the hot plate and closes when the hot plate is below a predetermined temperature when keeping the coffee liquid warm. 1. A coffee liquid extraction device comprising: a thermal switch that turns on electricity to the device and opens when the temperature exceeds a predetermined temperature to cut off electricity to the high-temperature heating device.