JPH0679571B2 - 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 has a structure as shown in FIG. That is, the lower part of the water tank 1 for containing water 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. At the bottom of the coffee basket 7, a coffee receiver 9 for storing coffee liquid is placed on the 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. And about 3 to get good coffee liquid
It is necessary to extract in a brewing time of about 5 minutes to about 5 minutes to reduce the extraction of poor quality components of coffee powder, but with the above structure, it takes about 6 to 8 minutes even with about 5 cups, and with a large capacity of 10 cups It took a long time of 12 to 14 minutes, and it was difficult to obtain a delicious coffee liquid. In order to reduce the extraction time in response to this, there is a heater 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 also the heating pipe 3 Temperature rises, the water in the heating pipe 3 boils over the whole, and the steam generation abnormally increases, so that the check valve 2 does not operate smoothly, and the water in the water tank 1 is heated by the heating pipe 3. Not supplied to. Especially when the cup is low, since the water pressure is low, the amount of water flowing into the heating pipe 3 decreases, steam generation increases, pressure is constantly applied to the check valve 2, hot water supply is stopped, and most of heat energy is wasted in steam generation. This is a phenomenon that takes place and is time-consuming and extremely inefficient.

In order to see the amount of water in the water tank 1, there are methods to make the entire water tank 1 transparent or to attach a water level gauge, etc., but all of them only increase the cost and the purpose of the function is to display the water level. there were. Normally, when water is heated, calcium carbonate, etc. contained in the water adheres to pipes,
The pipe flow is insufficient, the extraction speed is reduced, heat exchange is not performed smoothly, and the heater becomes hot and the durability deteriorates. There was a problem that the body was damaged after passing.

Therefore, the present invention provides an electric coffee brewer that enables smooth hot water supply in a short time and clearly displays the water level while preventing the adherence of water components from the outside to prevent body failure. Is what you are trying to do.

Means for Solving the Problems In order to solve the above problems, the present invention relates to a drip riser pipe facing a coffee basket connected to a drain end of a drip heating pipe connected to a drip drain of a water tank, and a water tank. A circulation riser pipe connected to the drain end of a circulation heating pipe connected to the circulation drainage port and connected to the upper part of the water tank, and this circulation riser pipe is exposed outside the body and at least a part of which is transparent Is.

Function With this configuration, water can be smoothly supplied to the heating pipe even if it is heated with a high wattage heater, so the temperature of the heater is prevented from rising and steam generation is reduced, and the water is returned to the water tank by the circulating water pump. The hot water and steam increase the internal pressure of the water tank, and the water supply to the heating pipe becomes smooth, and efficient hot water supply with less steam discharge is possible without stopping the hot water supply. In addition, since the circulating water riser pipe is visible from the outside, not only does it serve as a water level gauge when water is put in the water tank, but also an accurate amount of water can be obtained. Calcium carbonate or the like adheres to the same extent as the heating pipe, and serves as a guide for removing the deposits accumulated in the heater portion, and the failure of the body can be prevented in advance.

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 by 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. Reference numeral 17 is a heater body, and a drip heating pipe 19 and a circulation heating pipe 20 are integrally formed on both side surfaces of a U-shaped heater 18. 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 above the maximum water level by a circulation water raising pipe 22. The circulating water rising pipe 22 is attached so as to be visible from the outside of the body and is made of a transparent material such as polycarbonate resin and heat resistant glass.

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. The heater body 17 is fixed to a base 26 made of a heat-resistant transparent material such as phenol resin through a heat insulating plate 25 and a heater packing 26.

Reference numeral 28 in the drawing is a coffee basket for storing and extracting an object to be extracted such as coffee powder, and is supported on a coffee receiver 29. The coffee receiver 29 is placed on the heat insulating plate 25. A discharge port 30 is connected to the drip water rising pipe 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.

A desired amount of water is put into the water tank 11 while confirming the water level through the circulating water rising pipe 22, the tank lid 15 is closed, and the parts other than the ventilation valve 16 are sealed. A coffee basket 28 containing a desired amount of coffee powder is placed on the coffee receiver 29 and the heat insulating plate 25 is placed.
Put on. Water stored in the water tank 11 is circulated and drained 1
1, passing through the drip drainage port 12, the heating pipes 19, 20 and flowing into the water rising pipes 22, 24, the water rises to the same water level as the water tank 11, and the water level is displayed on the circulating water rising pipe 22. heater
When electricity is supplied to 18, the heater body 17 is heated and the heater
The heating pipes 19 and 20 located on both sides of 18 are efficiently heated. Since the amount of water supplied into the heating pipe is larger than in the conventional case, heat is exchanged more frequently, so that 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 heated to boil and expand by being heated, and the check valve
By the action of 14, the riser pipes 22, 24 are raised. When hot water is discharged, the water in the water tank 11 flows in from the check valve 14 and boil-expands again in the heating pipe.However, with a single heating pipe as in the past, a heater is used for extraction in a short time. When the wattage of 4 is increased, the heat exchange becomes insufficient and the heater 4 becomes high in temperature, resulting in poor durability, and when the diameter of the heating pipe is simply increased to increase heat exchange, it partially boils. The generated steam will be connected in the heating pipe and will be discharged as steam to prevent smooth hot water supply. Even if local steam generation can be achieved, the temperature of the extruded water will be low, making it ideal. Hot water could not be supplied, but by heating multiple heating pipes 19 and 20, the heater body 1
The temperature of 7 does not become high even if the heater 18 has a high wattage, and the water in the heating pipe ideally boils and expands to provide smooth hot water supply. The water flowing from the drip drainage port 13 is heated by the drip heating pipe 19, rises up the drip water raising 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 of the coffee basket 28. The components are extracted and stored in the coffee receiver 29. On the other hand, the circulation drainage port
The water flowing in from 12 is heated by the circulation heating pipe 20 and returned to the water tank 11 through the circulation water rising pipe 22. Circulation riser 22
The hot water and steam returned to the water tank 11 from above the maximum water level by the water tank as the hot water supply progresses.
It works to increase the internal pressure of 11, and the flow of water into the drip heating pipe 19 becomes extremely smooth, and even when the water level is low, smooth hot water supply is realized and efficient short-time extraction with less steam generation is realized. It At this time, since hot water passes through the circulating water rising pipe 22 in the same manner as the heating pipes 19 and 20, calcium carbonate and the like contained in water accumulates and adheres almost in the same manner as the heating pipes 19 and 20, but is visible from outside the body, You can clearly determine when to care. If the deposits are deposited on the heating pipes 19 and 20, not only the drip time becomes longer, but also the heat exchange becomes insufficient and the heater 18 becomes hot and breaks, which can be prevented in advance. When the water in the water tank 11 runs out, the temperature of the heater body 17 rises and the thermostat
The temperature is controlled to a constant temperature by 32, and the coffee liquid in the coffee receiver 29 on the heat retaining plate 25 is kept at a constant temperature.

Although the circulating water rising pipe is provided separately from the water tank in the present invention, it may be integrally formed and may be changed without departing from the scope of the invention.

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 A circulation riser pipe connected to the drain end of the circulation heating pipe connected to the circulation drainage port of the tank and connected to the water tank was provided, and this circulation riser pipe was made visible from outside the body and at least a part was made transparent. Therefore, heat is exchanged between the drip heating pipe and the circulating heating pipe to prevent the heater from rising in temperature, and the circulating water riser pipe is used for boiling water in the water tank.
By returning the steam, the internal pressure of the water tank is raised and the water is smoothly supplied to the drip heating pipe, which enables smooth and short-time hot water supply. Furthermore, when water is supplied to the water tank, the water level can be confirmed from the outside with a circulating water riser pipe, and an accurate amount of water can be measured. It accumulates inside the water pipe to let you know when it is time to clean it and prevent damage to the body.

[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 (1)

[Claims] 1. A water tank for containing water, a heater for heating a plurality of heating pipes, a water suction end of these heating pipes, a drip drainage port provided at the bottom of the water tank, and a circulation drainage port are check valves. Connecting pipe, the drip riser pipe connected to the drain end of the drip heating pipe connected to this drip drain port and facing the coffee basket containing the coffee powder, and the circulation heating pipe connected to the circulation drain port. An electric coffee brewer having a circulating water rising pipe connected to the drain end of the water tank and connected to the water tank, the circulating water rising pipe being made visible from outside the body, and at least a part of which being transparent.