JPH0679572B2 - Electric coffee heater - Google Patents

Description

TECHNICAL FIELD The present invention relates to an electric coffee brewer for extracting coffee and the like.

2. Description of the Related Art A conventional electric coffee brewer of this type is disclosed in, for example,
It had a structure as shown in the 60-38427 publication.

That is, as shown in FIG. 2, a water tank 1 containing water.
The lower part of is connected to one end of the heating pipe 3 via the check valve 2. This heating pipe 3 is embedded together with the heater 4 in a heater body 5 made by aluminum die casting. The other end of the heating pipe 3 is connected to the water rising pipe 6 and forms a discharge port 8 above the coffee basket 7 containing the coffee powder. Coffee basket 7
A coffee receiver 9 for storing a coffee liquid is placed on the lower part of the above-mentioned heater body 5 via a heat insulating plate 10.

However, in such a structure, the water in the water tank 1 is heated by the heater 4 in the heating pipe 3 and partially boiled and expanded, and the hot water flows through the water rising pipe 6. The coffee powder in the coffee basket 7 is poured from the discharge port 9, stored in the coffee receiver 9 and kept warm by the heat insulating plate 10. By the way, in order to obtain a delicious coffee liquid, it is necessary to extract it in a short brewing time of about 3 to 5 minutes to reduce the defective components of the coffee powder. It took about a minute, and it took 12 to 14 minutes with a large capacity of 10 cups.

In order to deal with this, there is one in which the power consumption of the heater 4 is increased. However, not only is the watt density of the heater 4 too large and there is a problem in durability, but the temperature of the heating pipe 3 increases and The water in the pipe 3 boils over the whole, and the generation of steam abnormally increases, so that the check valve 2 does not operate smoothly and the water in the water tank 1 is not supplied to the heating pipe 3. Especially when the cup is low, since the water pressure is low, the amount of water flowing into the heating pipe 3 is small, the steam generation increases, the check valve 2 is constantly under pressure, water is not supplied, and most of the thermal energy is wasted in steam generation. This is a phenomenon that takes place and is time-consuming and extremely inefficient.

Therefore, the present invention makes it possible to supply hot water smoothly in a short time and to improve the thermal efficiency with a simple configuration.

Means for Solving the Problems In order to solve the above problems, the present invention relates to a drip riser pipe connected to a drain end of a drip heating pipe connected to a drip drain of a water tank and facing a coffee basket, and a water tank. The circulating water pipe is connected to the drain end of the circulating heating pipe connected to the circulating drain port and is connected to the water tank. The circulating water pipe is an upright pipe inside the water tank.

Function With this configuration, water can be smoothly supplied to the heating pipe even if it is heated using a high wattage heater, so the temperature of the heater is prevented from rising, steam generation is reduced, and heat exchange is performed smoothly. As a result, the internal pressure of the water tank is raised by the hot water and steam returned to the water tank, and even when the cup is low, the water supply to the heating pipe becomes smooth and the hot water supply is efficient with little steam discharge without stopping the hot water supply. Also,
Since the circulating water riser is set upright inside the water tank, all the amount of heat obtained from the circulating water riser is supplied to the water tank to improve the thermal efficiency, and the space for installing the circulating water riser can be reduced to realize a compact body. .

Embodiment One embodiment of the present invention will be described below with reference to FIG. In the figure, 11 is a water tank with an upper opening, which has a circulation drainage port 12 and a drip drainage port 13 at the bottom, and each has a check valve.
I have placed 14. The upper opening of the water tank 11 is sealed with a tank lid 15, and a ventilation valve 16 for allowing air to flow into only the water tank 11 side is arranged on the top surface thereof.

A heater body 17 is a U-shaped heater 18 made of a material having good thermal conductivity such as aluminum die cast.
A drip heating pipe 19 and a circulating heating pipe 20 are integrally formed on both sides of the. One end of the circulation heating pipe 20 is connected to the circulation drainage port 12 by a connecting pipe A21, and the other end is connected to the water tank 11 by a circulation water raising pipe 22. This circulation water pipe 22
Is a pipe-like shape that stands upright inside the water tank 11, and the upper end opening 34 opens above the maximum water level of the water tank 11. In addition, the circulating water rising pipe 22 is provided with a step portion 35 for displaying the water level to facilitate the measurement of the water amount. Further, the circulating water rising pipe 22 is integrally formed with the water tank 11. One end of the drip heating pipe 19 is connected to the drip drainage port 13 located at a position lower than the circulation drainage port 12 by a connecting pipe B23, and the other end is connected to a drip water rising pipe 24. This heater body 17 uses the heat insulation plate 25 as a heater packing.
It is fixed via a 26 to a base 26 made of a material having excellent heat resistance such as phenol resin.

Reference numeral 28 in the figure denotes a coffee basket for storing and extracting an object to be extracted such as coffee grounds and a coffee receiver 29.
Is supported on. The coffee receiver 29 is placed on the heat insulating plate 25. A discharge port 30 is connected to the drip water rising pipe 24 and opens above the coffee basket 28. Reference numeral 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 described. Circulate a desired amount of water in the water tank 11
While checking, check that the tank lid 15 is closed and all but the ventilation valve 16 are sealed. A coffee basket 28 containing a desired amount of coffee powder is placed on a coffee receiver 29 and placed on a heat insulating plate 25. The water stored in the water tank 11 passes through the circulation drainage port 11 and the drip drainage port 12, passes through the heating pipes 19 and 20 and flows into the riser pipes 22 and 24, and the water rises to the same water level as that of the water tank 11. 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 the amount of water supplied into the heating pipe is larger than in the conventional case, heat exchange is performed more frequently, the temperature of the heater 18 becomes lower, and the durability is significantly improved. The water in the heating pipes 19 and 20 is partially boiled and expanded by being heated, and by the action of the check valve 14, the water rising pipe 2
Ascend 2,24. When hot water is discharged, the water in the water tank 11 flows in from the check valve 14 and boiles and expands in the heating pipes 19 and 20 again. However, if the wattage of the heater 4 is increased, the heat exchange becomes insufficient due to insufficient heat exchange, resulting in poor durability, and it may be partially increased by simply increasing the diameter of the heating pipe to increase heat exchange. It is ideal that the steam that boiled and is generated will be connected in the heating pipe and will not be discharged smoothly to supply hot water, or that the temperature of the extruded water will be low even if steam is locally generated. Hot water supply was not possible, but multiple heating pipes 19,20
The temperature of the heater body 17 is raised by heating the heater 18
Even if the wattage is set to a high wattage, the temperature does not become high, and the water in the heating pipe ideally boils and expands to provide smooth hot water supply. The water flowing in from the drip drainage port 13 is heated by the drip heating pipe 19, rises up the drip rising pipe 24 by the action of the check valve 14 and is dripped from the discharge port 30, and is poured into the coffee powder in the coffee basket 28 and the coffee component. Extract the coffee receiver 29
Housed in. On the other hand, the water flowing from the circulation drainage port 12 is heated by the circulation heating pipe 20 and returned to the water tank 11 through the circulation water rising pipe 22. At this time, the hot water passes through the circulating water rising pipe 22 inside the water tank 11 and is discharged above the maximum water level from the upper end opening 34, so that the amount of heat obtained in the circulating water rising pipe 22 almost heats the water tank 11. Used to improve efficiency. The hot water and steam returned to the water tank 11 act to increase the internal pressure of the water tank 11 as the hot water supply progresses, and even if the water level in the water tank 11 becomes low, the water does not flow into the drip heating pipe 19. It becomes extremely smooth and smooth heat exchange is performed, and efficient short-time extraction with less steam generation is realized. Further, since the circulating water rising pipe 22 can be formed integrally with the water tank 11 and is provided inside, the cost of sealing and the like can be reduced, and a compact and highly reliable pipe can be obtained. When the water in the water tank 11 runs out,
The temperature of the heater body 17 rises and is controlled to a constant temperature by the thermostat 32, so that the coffee liquid in the coffee receiver 29 on the heat retaining plate 25 is kept at a constant temperature.

EFFECTS OF THE INVENTION As is apparent from the above description of the embodiments, according to the present invention, the drip water rising pipe connected to the drain end of the drip heating pipe connected to the drip drain of the water tank and facing the coffee basket, and the water The drip heating pipe is equipped with a circulation riser pipe connected to the drainage end of the circulation heating pipe connected to the circulation drainage port of the tank and connected to the water tank. This circulation riser pipe is an upright pipe inside the water tank. And heat is exchanged by a circulating heating pipe to prevent the heater from rising in temperature to reduce steam generation and improve efficiency, and by circulating hot water and steam back to the water tank with a circulating water rising pipe, the internal pressure of the water tank is increased and drip heating is performed. By smoothing the supply of water to the pipes and realizing smooth heat exchange, and by installing a circulating water rising pipe inside the water tank, by reducing the heat loss in the circulation part, In addition to improving the thermal efficiency of the entire water heater, the space for installing the circulating water riser can be reduced and a compact body can be realized.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of an electric coffee brewer according to an embodiment of the present invention, and FIG. 2 is a vertical sectional view showing a conventional electric coffee brewer. 11 …… water tank, 12 …… circulation drainage port, 13 …… drip drainage port, 14 …… check valve, 16 …… vent valve, 18 …… heater,
19 …… Drip heating pipe, 20 …… Circulation heating pipe, 2
1,23 …… Connection pipe, 22 …… Circulation riser pipe, 24 …… Drip riser pipe, 28 …… Coffee basket.

Claims (2)

[Claims] 1. A sealable water tank equipped with a ventilation valve, a heater for heating a plurality of heating pipes, a water absorption end of these heating pipes and a drip drainage port and a circulation drainage port provided at the bottom of the water tank. And a connecting pipe that connects via a check valve,
The water tank connected to the drain end of the drip heating pipe connected to this drip drainage port, which is connected to the drain end of the circulation heating pipe connected to the circulation drainage port, and the water tank connected to the circulation drainage port. An electric coffee brewer having a circulating water raising pipe connected to the water tank, the circulating water raising pipe being a pipe standing upright inside the water tank. 2. The electric coffee brewer according to claim 1, wherein the circulating water rising pipe is formed integrally with a water tank.