JPS5829423A - Coffee maker - Google Patents

Abstract

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

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a coffee maker that enables delicious coffee extraction by continuously and quickly supplying high-temperature water to coffee powder.

A conventional drip type coffee maker as shown in FIG. 1 is known. In the figure, 1 is the main body, which is composed of a water container 2, a cup holder 3, and a built-in heater part 4. 6 is a cup on the cup holder 3; 6 is a strainer placed on the cup 6; there is a removable filter 7 inside;
It is equipped with

8 is a sheathed heater installed in the heater built-in section 4,
An inflow pipe 9 for heating the water in the water container 2 and a discharge pipe 1o for discharging the heated water pass near the sheathed heater 8. 11 is a check valve that allows passage only in the direction of the arrow. 1
2 is a removable lid O. Conventionally, the structure 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 liquid is guided to the vicinity of the heater 8, where it is heated to near the boiling point. Due to the vapor pressure caused by the heating, it rises in the discharge pipe 1o, falls into the strainer θ, and sprinkles on the coffee powder to perform an extraction action. In this case, the water in the pipe heated by the heater is
The water rises only when the vapor pressure increases, so once it is discharged, the vapor pressure decreases, so the discharge of water is interrupted until the next accumulation of steam pressure, and the discharge from the discharge pipe 1o becomes intermittent. be. This intermittent water discharge continues until the water in the water container 2 runs out, so coffee extraction continues for a long time with insufficient water volume, and the water temperature is also significantly cooled, so the extraction time is kept as short as possible. This violates the coffee extraction conditions of keeping the water temperature as high as possible for the time required, and such conventional products were unable to extract delicious coffee.The present invention eliminates the above-mentioned drawbacks. The configuration is shown in FIG. The same parts as in FIG. 1 are given the same reference numerals. The difference from the conventional example shown in FIG. The drain pipe 14 extends from the drain pipe 14 to the top of the strainer 6 and is open. Furthermore, a valve body 16 is provided at the bottom of the auxiliary container 2. The detailed configuration of the valve body 16 is as follows:
This is shown in FIG. In FIG. 3, 16 is a drainage hole provided at the bottom of the auxiliary container 13, 17 is a valve, and the lower end is a shape memory alloy 18 that assumes the stretched shape memorized at high temperature when it reaches a predetermined high temperature. Supported by

Shape memory alloy 18 is generally an alloy of Ti, 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. 21 and 22 are drain holes provided in the valve body 16.

In the above configuration, to explain its operation, the water container 2
The water poured into the container rises in the discharge pipe 1o and falls into the auxiliary container 13, which is the same as in the conventional example described above.

In this case, since the water temperature is low, the shape memory alloy 18 in the valve body 16 is compressed by the spring 19, the valve 1γ moves downward, and the drain hole 16 is in an open state. Therefore, the water that has entered the auxiliary container 13 is 16,21
．． The water passes through holes such as 22 and flows back into the water container 2. 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 1
8 compresses the spring 19 in order to return to the stretched state that it memorizes with a strong force, and the valve 17 rises to open the drain hole 1.
Close 6. 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, from the position of the opening A of the auxiliary container 13 of the drain pipe 14,
Since the opening B to the strainer 6 is lower, the water accumulated in the auxiliary container 13 enters the strainer 6 through the drain pipe 14 due to the siphon action when the water level reaches a certain level.

Start 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. Conversely, if the flow rate of the siphon is increased, the siphon will temporarily stop after a certain amount of high-temperature water has fallen continuously, and when the water level rises again, the siphon will start operating.

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]

FIG. 1 is a sectional view of a conventional coffee maker, FIG. 2 is a sectional view of a coffee maker according to 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...--Filter, 9...
-... Inflow pipe, 1o... Outlet pipe, 13...
...Auxiliary container, 14...Drain pipe, 16...
... Valve body, 16 ... Drain hole, 17 ...
··valve. Name of agent: Patent attorney Toshio Nakao and one other person
11!1

Claims (1)

[Scope of Claims] (1) A water container and a device for heating and circulating the water in the water container, an auxiliary container is provided in the water container, and the auxiliary container has a discharge pipe for guiding the circulating water. This coffee maker is equipped with a valve that opens and closes the drain hole of the auxiliary container depending on the water temperature, and a drain pipe that drains the water that accumulates in the auxiliary container to a strainer. (2) The coffee maker according to claim 1, wherein the drain pipe for discharging the water in 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 the 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 the circulating water flowing into the auxiliary container. (6) Coffee maker 0 according to claim 1, in which the operation of the valve is performed by a shape memory alloy.