JPH0728823B2 - Coffee makers - Google Patents

Description

TECHNICAL FIELD The present invention relates to a coffee maker for extracting coffee by pumping hot water in a container with an electric pump.

Prior Art FIG. 5 shows the configuration of a conventional coffee maker. In the figure, 31 is a coffee server for storing coffee powder 38, and a "fold" is provided on the inner wall surface so that a filter such as filter paper (not shown, hereinafter referred to as a filter) does not adhere to the inner wall surface. I am doing it. 32 is a water tank mounted in the exterior main body 37, 33 is a casting heater provided in the lower part of the water tank 32, 34 is a hot water supply pipe partially embedded in the heater 33, and one end thereof is the water tank 32
Of the coffee server 31, and the other end faces the upper opening of the coffee server 31. Reference numeral 35 is a check valve mounted on the water tank 32 side of the hot water supply pipe 34, which opens in the direction in which the water in the water tank 32 flows into the hot water supply pipe 34. Note that 38 is coffee powder.

With the above configuration, a predetermined amount of coffee powder 38 is put into the coffee server 31, and a predetermined amount of water is also put into the water tank 32. When the heater 33 is energized, the water in the water tank 32 enters the buried portion 36 of the hot water supply pipe 34 through the check valve 35, is heated by the heater 33 to become boiling water, and the hot water supply pipe 36 is raised by its vapor pressure. Then, hot water is supplied once in the coffee server 31. When this hot water supply is completed, the buried part of the hot water supply pipe 34
Water is newly supplied to the 36 from the water tank 32, and boiling and hot water supply are performed. By repeating this, hot water is intermittently supplied to the coffee server 31 and coffee is extracted.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, in a conventional coffee maker, water is exchanged with the heater 33 in the buried portion 36 of the hot water supply pipe 34 to boil and intermittently supply hot water. Therefore, there is a problem that the extraction time of coffee is long.

This is due to the following reasons. That is, when the filter is set in the coffee server 31, a gap is formed between the filter and the inner wall surface of the coffee server 31 due to the “fold” provided on the inner wall surface of the coffee server 31. When hot water is poured into this filter, the hot water leaked from the surface of the filter flows down between the “folds” of the coffee server 31 along its inner wall surface. When coffee powder 38 is put in the filter in this state, the coffee powder 38 floats in the poured hot water, and according to the leakage of hot water from the surface of the filter described above, as shown in FIG. As shown by the dotted line, a layer is formed along the inner surface of the filter, and the extract liquid from the coffee grounds 38 is filtered and flows down along the inner wall surface of the coffee server 31. The layer formed by the coffee grounds 38 means that the filtration surface of the coffee grounds 38 is increased, and not only the coffee extraction from the coffee grounds 38 is uniformly performed, but also the layer is formed. Has a thin thickness, and also acts to shorten the passage time of hot water.

The above is the case where a large amount of hot water is supplied to the coffee powder 38 at once.

However, the hot water supply of the conventional coffee maker is intermittent as described above, and the amount of each hot water supply is small. Therefore, the coffee powder 38 does not float in the hot water, and does not form a layer along the surface of the filter as it is kept in the coffee server 31 (filter), as shown by the solid line in FIG. It will be in a thick state as if it had been deposited on. In this state, it takes time for hot water to pass through the coffee powder 38, and there is a problem that the coffee extraction time becomes long.

In addition, since the amount of hot water per time is small and the hot water is supplied intermittently, the hot water of the coffee powder 38 is not supplied at one time, and therefore the unevenness of the coffee powder 38 becomes insufficient.
There was also the problem that I couldn't get good coffee.

Means for Solving the Problems In order to solve the above problems, the present invention provides an exterior body,
A container for storing hot water mounted in the exterior main body, a heater for heating water in the container, a centrifugal pump provided at a lower portion of the container for pumping hot water in the container, and a centrifugal pump for hot water. Is provided, a coffee server that receives hot water supplied through the sprayer, and a switch unit that sets the amount of hot water supplied, and a predetermined amount of hot water is obtained by counting the number of rotations of the centrifugal pump. It is intended to be supplied to the coffee server.

Operation With this configuration, when coffee is extracted, hot water is boiled by the heater in the container, the hot water is pumped by the centrifugal pump, and is supplied into the coffee server through the sprayer to count the number of rotations of the centrifugal pump. Since it is possible to supply a predetermined amount of hot water to the coffee server continuously and at once,
In the coffee server, a uniform layer of coffee powder is formed along the inner wall of the coffee server, and as described above, the hot water passes through the coffee powder for a shorter time and the coffee powder can be sufficiently dispersed. You can get good coffee.

Embodiment An embodiment of the present invention will be described below with reference to the accompanying drawings.

In FIG. 1, 1 is the exterior body of the coffee maker,
A container 2 for boiling and storing hot water is installed therein. 3 is a lid attached to seal the opening of the container 2
Is a heater, which is fixed to the outer bottom surface of the container 2. 5 is a communication pipe for checking the water level in the container, and a float 6
Is provided. Reference numeral 7 is a motor provided between the exterior main body 1 and the bottom of the container 2, 8 is a centrifugal pump driven by the motor 7, and its suction port 9 communicates with the bottom of the container 2. Reference numeral 10 denotes a discharge port of the centrifugal pump 8, in which hot water is pumped upward through a hot water supply pipe and is poured from a water injection port 12 to a sprinkler 13 which disperses and sprays the hot water. 14 is a spreader
It is a coffee server that is detachably installed under 13 and has "folds" on the inner wall surface. A filter and coffee powder 17 are set on the inner surface. Denoted at 15 is a detachable coffee receiving container arranged at the bottom of the coffee server 14, and 16 is a heater for keeping heat.

Next, the centrifugal pump 8 will be described with reference to FIGS. 17 is an impeller in which blades 17a are radially arranged,
The impeller 17 is provided with a small gap t having a substantially constant width continuously on a concentric circle along the outer circumference, and the gap t forms a pump chamber 18. Reference numeral 19 is a power transmission plate fixed to the shaft 7a of the motor 7, a magnet 19a is mounted on the surface on the impeller 17 side, and a mark 19b detected by the optical sensor 20 is provided on the back surface. The magnet 19a is electromagnetically coupled to the magnet 17b embedded in the impeller 17 via the partition wall 21, and the power of the motor 7 is transmitted. An optical sensor 20 detects the number of rotations of the mark 19b provided on the power transmission plate 19.

FIG. 4 shows a circuit block diagram, where 22 is a switch unit for the user to set the amount of hot water, and the switch parts are 22a, 22
It is composed of a plurality of b, 22c, 22d and 22e, each of which is operated by a push button. Each switch is connected to a counter circuit 23 in which the number of rotations of the impeller 17 is set variously. For example, the push button switch 22a is set to the amount of coffee of 100cc, the push button switch 22b is set to the amount of coffee of 200cc, the push button switch 22c is set to the amount of coffee of 300cc, and the number of rotations for pumping the corresponding hot water amount is set. Has been done. The optical sensor 20 sends a signal indicating the number of rotations of the impeller 17 to the counter circuit thus set, and the counter circuit outputs a signal for turning off the motor 7 at the matching number of rotations.

Next, the operation of the above configuration will be described.

When extracting coffee, water is put in the container 2, boiled by the heater 4, and a filter and a predetermined amount of coffee powder 17 are set in the coffee server 14. And
When the amount of hot water corresponding to the amount of coffee to be extracted is selected and set from the switch unit 22, the motor 7 rotates and the centrifugal pump 8 operates, so that the hot water in the container 2 passes through the hot water supply pipe 11 from the suction port 9. The water is pumped up, poured into the sprayer 13 from the water inlet 12, and is uniformly supplied into the coffee server 14 by the sprayer 13. The number of rotations of the motor 7 is detected by detecting the mark 19a of the power transmission plate 19 by the optical sensor 20, and when the number of rotations is counted and reaches a predetermined number, the counter circuit 23 stops the motor 7.

As a result of the above operation, the amount of hot water corresponding to the amount of coffee to be extracted is sufficient and supplied to the coffee server 14 at a time, so as described above, the coffee powder 17 in the coffee server 14 is stored in the coffee server 14. By forming a layer along the inner wall of 14, the coffee extraction time is shortened and delicious coffee can be extracted.

Effects of the Invention As described above, according to the present invention, it is possible to supply hot water in an amount corresponding to the amount of coffee extracted using the centrifugal pump to the coffee server at once through the sprayer,
It is possible to obtain a coffee maker superior to a conventional coffee maker by being able to uniformly disperse hot water in coffee powder and sufficiently steaming it, shortening coffee extraction time, and extracting delicious coffee.

[Brief description of drawings]

1 is a sectional view showing an embodiment of a coffee maker of the present invention, FIG. 2 is a side sectional view of a centrifugal pump incorporated in the coffee maker, and FIG. 3 is a partial sectional view of the centrifugal pump. The front view shown in FIG. 4 is a circuit diagram of the switch unit,
FIG. 5 is a cross-sectional view showing a conventional coffee maker. 1 ... Exterior body, 2 ... Container, 4 ... Heater, 8 ... Centrifugal pump, 14 ... Coffee server, 19 ... Power transmission plate, 20 ... Optical sensor, 22 ... Switch unit.

Claims (2)

[Claims] 1. An outer body, a container for storing hot water mounted in the outer body, a heater for heating water in the container, and hot water in the container provided below the container. A centrifugal pump, a sprinkler to which hot water is supplied by the centrifugal pump, a coffee server to which hot water is supplied via the sprinkler, and a switch unit for setting the hot water supply amount are provided, and the number of rotations of the centrifugal pump is set. A coffee maker that counts and supplies a predetermined amount of hot water to the coffee server. 2. The coffee maker according to claim 1, wherein the number of rotations of the centrifugal pump is counted by detecting the rotation of the power transmission plate fixed to the motor shaft with an optical sensor.