JPS636210B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a coffee maker that enables delicious coffee extraction by continuously supplying high-temperature water to coffee powder in a short period of time.

A conventional drip type coffee maker as shown in FIG. 1 is known. In the figure 1
The main body consists of a water container 2, a cup holder 3, and a built-in heater part 4. Numeral 5 is a cup on the cup holder 3, and 6 is a strainer placed on the cup 5, which is provided with a removable filter 7 inside. 8 is a sheathed heater installed in the heater built-in part 4, and an inflow pipe 9 for heating the water in the water container 2 and a discharge pipe 10 for discharging the heated water pass near the sheathed heater 8. There is. 11 is a check valve that allows passage only in the direction of the arrow. 12 is a removable lid.

Conventionally, the configuration is as described above, so when the lid 12 is opened, water is poured in, the coffee powder to be extracted is poured into the strainer 6, and the sheathed heater 8 is energized.
The water falls through the check valve 11 and is led to the vicinity of the sheathed heater 8 through the inflow pipe 9, where it is heated to near the boiling point. The steam pressure caused by the heating causes it to rise inside the discharge pipe 10 and fall into the strainer 6.
It performs the extraction action by sprinkling it on the coffee powder. In this case, the water in the pipe heated by the heater is
The water rises only when the steam pressure increases, so once it is discharged, the steam pressure decreases, so the discharge of water is interrupted until the next accumulation of steam pressure, and the discharge from the discharge pipe 10 becomes intermittent. It is. This intermittent water discharge continues until the water in the water container 2 runs out.
Coffee extraction continues for a long time with an insufficient amount of water, and the water temperature is also significantly cooled, which violates the coffee extraction conditions of keeping the extraction time as short as possible and the water temperature as high as possible. With conventional products, it was not possible to extract delicious coffee.

The present invention eliminates the above-mentioned drawbacks and includes:
Figure 2 shows its configuration. The same parts as in FIG. 1 are given the same reference numerals. What is different from the conventional example shown in FIG. The drain pipe 14 extends to the top of the strainer 6 and is open. Furthermore, a valve body 15 is provided at the bottom of the auxiliary container 2. The detailed structure of the valve body 15 is shown in FIG. In Figure 3, 16
is a drainage hole provided at the bottom of the auxiliary container 13, and 17 is a valve, the lower end of which is supported by a shape memory alloy 18 that assumes the stretched shape memorized at high temperatures when a predetermined high temperature is reached. There is. shape memory alloy 18
Generally, it is made from an alloy of Ti and Ni, or Cu, Zn, and x (x is a metal element that affects the properties of the alloy), and the physical properties of the alloy can vary depending on the blending ratio. 19 is a spring that pushes down the valve 17, and 20 is a gasket provided at the bottom of the drain hole 16. Both 21 and 22 are drainage holes provided in the valve body 15.

In the above configuration, the operation is explained as follows.
The water placed in the water container 2 is heated by the sheathed heater 8 as in the conventional example described above, rises in the discharge pipe 10 due to steam pressure, and falls into the auxiliary container 13. In this case, since the water temperature is low, the shape memory alloy 18 in the valve body 15 is compressed by the spring 19, the valve 17 moves downward, and the drain hole 16 is in an open state. Therefore, the auxiliary container 1
The water that has entered the container 3 flows back into the water container 2 through holes 16, 21, 22, etc. In this way, while the circulation is being carried out, the water temperature in the water container 2 rises, and when the water temperature reaches a predetermined temperature, the shape memory alloy 18 returns to its memorized stretched state with a strong force. , compresses the spring 19 and the valve 17 rises to close the drain hole 16. After this, the high temperature water falling into the auxiliary container 13 gradually accumulates in the container and the water level rises. In this case, since the opening B of the drain pipe 14 to the strainer 6 is lower than the opening A of the auxiliary container 13, the auxiliary container 13
When the water level reaches a certain level, the water passes through the drain pipe 14 into the strainer 6 due to the siphon action, and starts extracting coffee powder. in this case,
If the flow rate from the drain pipe 10 is set higher than the flow rate from the siphon, the high temperature water entering the strainer 6 will fall continuously and extraction will be performed continuously. On the other hand, if you increase the flow rate of the siphon,
After a certain amount of high-temperature water falls continuously, the siphon temporarily stops, and when the water level rises again, the siphon is said to operate.

Since the present invention can operate as described above, it is possible to supply high-temperature water to coffee powder continuously and in a short time compared to conventional methods, and since the extraction time is short, cooling is required less. This makes it possible to obtain ideal extraction conditions. Furthermore, depending on the flow rate of the siphon, continuous hot water supply can be divided into several times, and in this case, coffee powder can be immersed in several times, making it possible to extract even better coffee. .

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of a conventional coffee maker, Figure 2 is a cross-sectional view of a conventional coffee maker.
The figure is a sectional view of a coffee maker showing an embodiment of the present invention, and FIG. 3 is an enlarged sectional view showing the relationship between the auxiliary container and the valve body. 2... Water container, 6... Strainer, 9... Inflow pipe,
10...Discharge pipe, 13...Auxiliary container, 14...Drain pipe, 15...Valve body, 16...Drain hole, 17...
…valve.

Claims (1)

[Claims] 1. A water container and a device for heating and circulating water in the water container, an auxiliary container is provided in the water container, and a discharge pipe for guiding the circulating water is opened in the auxiliary container. This coffee maker is equipped with a valve that opens and closes the drainage hole in the auxiliary container depending on the water temperature, and a drain pipe that drains water that accumulates in the auxiliary container to a strainer. 2. The coffee maker according to claim 1, wherein the drain pipe for discharging water from the auxiliary container to the outside has a siphon function. 3. The coffee maker according to claim 2, wherein the flow rate of the siphon is greater than the flow rate of circulating water flowing into the auxiliary container. 4. The coffee maker according to claim 2, wherein the flow rate of the siphon is lower than the flow rate of circulating water flowing into the auxiliary container. 5. The coffee maker according to claim 1, wherein the valve is operated by a shape memory alloy.