JPS6354127A - Electric coffee brewer - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention This invention relates to an electric coffee brewer for brewing coffee and the like.

BACKGROUND OF THE INVENTION A conventional electric coffee brewer of this type has a structure as shown in FIG. (For example, Jitko Sho 60-38427
In other words, the lower part of a water tank 1 containing water is connected to one end of a heating pipe 3 via a check valve 2. The heating pipe 3 and the heater 4 are embedded in a heater body 5 made of die-cast aluminum. The other end of the heating pipe 3 is connected to a water raising pipe and forms a discharge port 8 above a coffee basket 7 containing coffee grounds. At the bottom of the coffee basket, a coffee receiver 9 for storing coffee liquid is placed on the heater body 5 via a heat insulating plate 1o.

Problems to be Solved by the Invention However, with such a structure, the water in the water tank 1 is heated by the heater 4 in the heating pipe 3 and partially boils and expands, and the hot water is discharged through the water raising pipe. The coffee powder is poured into the coffee basket 7 from the outlet 9, and the coffee receiver is stored in the container 9 and kept warm by the heat insulating plate 10.
It has become.

And to get a delicious coffee liquid, it takes about 3 to 6 minutes.
It is necessary to brew coffee in a time of about 10 minutes to reduce the extraction of defective components from the coffee powder, but with the above structure, it takes about 6 to 8 minutes even with a 5-force brewing process, and 12 minutes with a large capacity of 10 cups. It took a long time of ~14 minutes, and it was difficult to obtain a delicious coffee liquid. In order to shorten the extraction time in response to this, some heaters 4 have increased power consumption. As the temperature of the water tank 1 rises, the water in the heating pipe 3 boils throughout and the generation of steam increases abnormally, which prevents the backflow valve 2 from working smoothly and causes water in the water tank 1 to boil over the heating pipe 3. is not supplied. Especially when the cup is low, the water pressure is low, so the amount of water flowing into the heating pipe 3 decreases, steam generation increases, and pressure is constantly applied to the reverse valve 2.
The hot water supply stopped, and most of the thermal energy was wasted in steam generation, which was time consuming and extremely inefficient.In addition, in order to see the amount of water in the water tank 1, the entire water tank 1 had to be made transparent. There are other ways to attach a water level gauge, but all of these methods increase costs and their only purpose is to display the water level. Normally, when water is heated, calcium carbonate, etc. contained in the water adheres to pipes, etc.
Pipe circulation becomes insufficient, and the extraction speed decreases, and heat exchange is not performed smoothly, causing the heater to reach a high temperature, resulting in poor durability.However, with conventional types, deposits cannot be detected, so it is time to take care of it. There was a problem that the equipment could be damaged if it was exceeded.

Therefore, the present invention provides an electric coffee boiler that makes it possible to supply hot water smoothly in a short time, clearly displays the water level, and allows the presence of water component deposits to be estimated from the outside, thereby preventing malfunctions of the machine. This is what I am trying to do.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention provides a drip water riser pipe connected to the drain end of the drip heating pipe connected to the drip outlet of the water tank and facing the coffee basket, and A circulating water rising pipe connected to the drain end of a circulating heating pipe connected to a circulating drainage port and connected to the upper part of the water tank, the circulating water rising pipe being exposed outside the vessel and at least partially transparent. It is.

Effect: With this configuration, water is smoothly supplied to the heating pipe even when heated using a high-wattage heater, which prevents the heater from becoming too hot, reduces steam generation, and returns the water to the water tank via the circulating water riser pipe. The internal pressure of the water tank is increased by the hot water and steam, and the water supply to the heating pipe becomes smooth, allowing efficient hot water supply with less steam discharge without stopping the hot water supply. Since the circulating water riser pipe is visible from the outside, it not only serves as a water level gauge when pouring water into the water tank, but also allows you to obtain an accurate amount of water. Calcium carbonate, etc. adheres to the same extent as the heating pipe, and this serves as a guideline for removing deposits that accumulate on a part of the heater, and prevents failure of the device.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to FIG. In the figure, reference numeral 11 denotes a water tank with an upward opening, which is provided with a circulation drain port 12 and a drip drain port 13 at the bottom, each of which is equipped with a reverse valve 14.

The upper opening of this water tank 11 is sealed with a tank lid 15, and a vent valve 16 for allowing air to flow only into the water tank 11 side is arranged on the top surface of the tank lid 15. 17 is a heater body,
Drip heating pipe 1 on both sides of U-shaped heater 18
9 and the circulating heating pipe 20 are integrally molded. One end of the circulation heating pipe 2o is connected to the circulation drain 12 by a connecting pipe 21, and the other end is connected to the water tank 11 above the maximum water level by a circulation water riser pipe 22. This circulating water riser pipe 22 is installed so that it is visible from outside the vessel,
It is made of transparent materials such as polycarbonate resin and heat-resistant glass.

One end of the drip heating pipe 19 is connected to the drip drain port 13 located at a lower position than the circulation drain port 12 by a connecting pipe B23, and the other end is connected to the drip water riser pipe 24. This heater body 17 is fixed via a heat insulating plate 25 and a heater packing 26 to a base 26 made of a transparent heat-resistant material such as phenol resin.

In addition, 28 in the figure is a coffee basket in which coffee powder and other materials to be extracted are stored and extracted, and a coffee receiver 29
is supported on top. This coffee receiver 29 is placed on the heat retaining plate 25. 3
0 is a discharge port connected to the drip water riser pipe, and is opened above the coffee basket 28. 31 is a handle of the coffee receiver 29; 32 is a thermostat that controls the temperature of the heater body 17; and 33 is a back plate that covers the back surface of the base 27.

Next, the operation of the configuration of this embodiment will be explained.

A desired amount of water is poured into the water tank 11 while checking the water level through the circulating water riser pipe 22, the evening cover 15 is closed, and everything except the ventilation valve 16 is sealed. In the coffee receiver, a coffee basket 28 containing a desired amount of coffee powder is placed on a container 29 and placed on a heat-insulating plate 25. The water stored in the water tank 11 passes through the circulation drain 11 and the drip drain 12, passes through the heating pipes 19 and 20, and flows into the rising pipes 22 and 24. The water rises to the same water level as the water level in the water tank 11, and is circulated. The water level is displayed on the water riser pipe 22. When the heater 18 is energized, the heater body 17 is heated, and the heating pipes 19 and 20 located on both sides of the heater 18 are efficiently heated. Since a larger amount of water is supplied into the heating pipe than in the past, a large amount of heat is exchanged, the temperature of the heater 18 is lowered, and the durability is significantly improved. heating pipes 19, 20
The water therein partially boils and expands as it is heated and rises up the riser pipe 22, 24 by the action of the reverse valve 14.

When hot water is discharged, water from the water tank 11 flows in through the check valve 14 and still boils and expands within the heating pipe.However, in conventional systems with only one heating pipe, the heater 4 If the wattage of the heater 4 is increased, the heat exchange becomes insufficient, causing the heater 4 to reach a high temperature and become less durable.If the diameter of the heating pipe is simply increased to increase heat exchange, partial boiling may occur. The generated steam may connect in the heating pipe and become steam discharge, making it impossible to supply hot water smoothly.Also, even if steam generation can be achieved locally, the water being pushed out will be at a low temperature, making it impossible to supply ideal hot water. However, by heating multiple heating pipes 19 and 20, the temperature of the heater body 17 does not become high even if the heater 18 is set to high wattage, and the water in the heating pipes also boils and expands ideally. Enables smooth hot water supply. Drip drain 1
The water flowing in from 3 is heated by the drip heating pipe 19, rises up the drip water riser pipe 24 by the action of the check valve 14, drips from the discharge port 30, and is poured into the coffee grounds in the coffee basket 28 to extract coffee components. coffee tray 2
It is accommodated in 9. On the other hand, water flowing in through the circulation drain port 12 is heated by the circulation heating pipe 20 and returned to the water tank 11 through the circulation water riser pipe 22. The hot water and steam returned to the water tank 11 from above the maximum water level by the circulation riser pipe 22 work to increase the internal pressure of the water tank 11 as hot water supply progresses, and the flow of water into the drip heating pipe 19 is extremely low. This results in smooth hot water supply even when the water level is low, and efficient short-time extraction with less steam generation. At this time, hot water passes through the circulating water riser pipe 22 in the same way as the heating pipes 19 and 20, so calcium carbonate, etc. contained in the water accumulates and arrives in almost the same way as in the heating pipes 19 and 20, but it is visible from the outside of the vessel. , the time for maintenance can be clearly determined. If deposits accumulate on the heating pipes 19 and 20, not only will the drip time become longer, but also heat exchange will become insufficient, causing the heater 18 to reach a high temperature and break, but this can be prevented. water tank 11
When the water runs out, the temperature of the heater body 17 rises and is controlled to a constant temperature by the thermostat 32.
The coffee liquid in the coffee receiver 29 on the heat insulating plate 26 is kept at a constant temperature.

In the present invention, the circulating water riser pipe is provided separately from the water tank, but it is also possible to mold the pipe as an integral part, and modifications may be made without departing from the scope of the invention.

Effects of the Invention As is clear from the above description of the embodiments, according to the present invention, the drip water riser pipe connected to the drain end of the drip heating pipe connected to the drip drain port of the water tank and facing the coffee basket, It is equipped with a circulation riser pipe connected to the water tank and connected to the drain end of the circulation heating pipe connected to the circulation drain of the tank, and this circulation riser pipe is visible from outside the vessel and at least partially transparent. Therefore, heat exchange is performed between the drip heating pipe and the circulation heating pipe to prevent the heater from becoming too hot, and the circulating water riser pipe returns hot water and steam to the water tank to increase the internal pressure of the water tank and reduce the flow of water to the drip heating pipe. The supply becomes smoother and hot water can be heated in a short time.

Furthermore, when supplying water to the water tank, the water level can be checked from the outside through the circulating water riser pipe, allowing for accurate measurement of the amount of water.When hot water is being supplied, hot water flows through this circulating water riser pipe, so the circulation rises as well as deposits that accumulate on the heating pipes. It accumulates inside the water pipes, letting you know when it's time for maintenance, and can prevent equipment failures.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of an electric coffee maker according to an embodiment of the present invention, and FIG. 2 is a longitudinal sectional view of a conventional electric coffee maker. 11...Water tank, 12...Circulation drain port, 13...Drip drain port, 14...
・Check valve, 16...Vent valve, 18...
Heater, 19...Drip heating pipe, 20
・・・・・・Circulating heating pipe, 21.23・・・・・・
Connection pipe, 22... Circulation water riser pipe, 24...
・Drip water riser, 28...Coffee basket. Name of agent: Patent attorney Toshio Nakao and 1 other person11
-11 water gunk! ? -Circulation' Minakuchi I3- Drip-o-cho Tabiguchi 14- Feng Shangzi/6-it'kisho 28- Coffee Basket Figure 2, 31054

Claims (1)

[Claims] A water tank that stores water, a heater that heats a plurality of heating pipes, and a water suction end of these heating pipes and a drip drain port and a circulation drain port provided at the bottom of the water tank are connected via a check valve. A connecting pipe, connected to the drain end of the drip heating pipe connected to this drip drain port, and connected to the drip water riser pipe facing the coffee basket containing coffee grounds, and connected to the drain end of the circulation heating pipe connected to the circulation drain port. An electric coffee boiler comprising a circulation water riser pipe connected to the water tank, the circulation water riser pipe being visible from outside the container and at least partially transparent.