JPS609442B2 - coffee boiler - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention involves dripping hot water onto coffee powder to obtain coffee.
This is a so-called drip type coffee boiler that supplies the most suitable hot water for filtering coffee to obtain delicious and flavorful coffee.

Drip coffee brewers generally supply water from a water tank.
The supplied water is heated in a heating pipe, and the force of air bubbles and steam causes it to rise in the rising pipe.The hot water that has risen in the rising pipe is discharged from above the coffee basket containing ground coffee and drips down. That's how you get your coffee.

In this case, the water in the water tank is discharged through a sealed heating pipe and rising pipe, and drips directly onto the coffee grounds, so the carbon dioxide and chlorine (chlorine) contained in the water remain intact. This has the disadvantage that it has a negative effect on the extraction of coffee components, making it impossible to obtain delicious and flavorful coffee.

The present invention solves the above-mentioned drawbacks of the conventional coffee maker, and embodiments of the present invention will be described below with reference to the accompanying drawings.

In the figure, 1 is an approximately L-shaped upper container, and water tank 2
A sprinkler cover 4 having a substantially hemispherical shape and a downwardly concave surface and a substantially cylindrical sprinkler cover stand 5 for supporting the sprinkler cover 4 are attached to the eaves portion 3.

A hole 6 is provided in the wall surface of the sprinkler lid stand 5, and a discharge pipe 7 made of a material such as silicone rubber is penetrated therethrough and attached in a watertight manner. One end of the discharge pipe 7 is connected to a rising water pipe 8,
The other end is located approximately at the lower center of the water sprinkling lid 4, and is provided with an upward spouting hole 9a and a downward spouting hole 9b. Reference numeral 10 denotes a heating element made of aluminum die-casting, and includes a heating element 11 such as a sheathed heater and a heating pipe 12.

The heating pipe 12 has one end connected to the water tank 2 of the upper container 1 via a check valve 13 that prevents water from flowing back from the heating pipe 12 to the water tank 2, and the other end connected to the water riser pipe 8. is connected to. 14 is a glass container, and a heat insulating plate 1 made of a material with good thermal conductivity such as an aluminum plate
A coffee basket 16 is placed on top of the heating element 10 through a heating element 5.

The coffee basket 16 has a V-shaped depression 17 in the center, and a hole 18 is provided at the bottom of the V-shaped depression 17. A filter paper 19 is attached to this V-shaped depression 17 and coffee powder 20 is placed therein. 21 is a lower container that covers the heating element 10 and the like, and 22 is an upper lid.

It should be noted that the space surrounded by the sprinkler lid 4 and the sprinkler lid stand 5 is provided in a state where it is completely communicated with the atmosphere.

Next, the operation in the above configuration will be explained. Place a filter paper in the coffee basket 16 and add 20 coffee grounds,
When water is poured into the water tank 2 and electricity is applied to the heating element 11, the water flowing into the heating pipe 12 is heated, boils, generates steam and bubbles, and rapidly expands in volume. The expanded hot water is prevented from flowing toward the water tank 2 by the check valve 13, so it rises through the rising water pipe 8 on the opposite side and reaches the discharge pipe 7.
It is discharged from the spout holes 9a and 9b, drips onto the coffee powder 20, extracts coffee components, and stores them in a glass container below. The above operation will be explained in detail below.

The water in the heating pipe 12 is heated to become hot water, and when it is further heated, steam and bubbles are gradually generated in some places in the heating pipe 12 and push up the hot water in the rising pipe 8, but the temperature of the hot water remains Since the hot water does not reach 100 qo and bubbles are generated gradually, the force with which hot water spouts out from the spout holes 9a and 9b is weak.

Therefore, the hot water falls to the sprinkling lid 4 without flowing up. That is,
The center of the coffee grounds 20 in the coffee basket 16 is poured. Further, the portion of the heating pipe 12 where the bubbles are generated is in a state of empty heating, and the temperature rapidly increases. When hot water pressed by other bubbles is located here, bubbles are suddenly generated and are vigorously ejected from the water spout holes ga and 9b. In addition,
The Sekiguchi cross-sectional area of the downward water spout hole 9b is the same as that of the upward water spout hole 9a.
The spouted hot water is mostly directed upward, collides with the sprinkling lid 4, disperses, travels through the sprinkling lid stand 5, and drips onto the outer periphery of the coffee grounds 20 in the coffee basket 16. Therefore, since the amount of coffee powder at the outer periphery of the coffee basket 16 is larger than that at the center, if there is a large amount of hot water dripping into this outer periphery, the hot water will drip evenly over the entire coffee grounds. As a result, coffee components can be extracted efficiently.

Note that the hot water spouted from the downward spouting hole 9b forms a depression in the center of the coffee grounds as shown in the figure, but this equalizes the distance that the hot water passes through the coffee grounds. This also causes efficient extraction of coffee components.

In addition, the hot water dripping onto the outer periphery of the coffee grounds 20 is exposed to the sprinkling lid 4.
Even though the water is cooled by the sprinkler lid stand 5 and the air and is slightly lower than the appropriate temperature, the hot water dripping into the center of the coffee grounds 20 is slightly higher than the appropriate temperature, and overall, the hot water at the appropriate temperature drips over the coffee grounds 20'. It will be done. On the other hand, the hot water in the water rising pipe 8 disappears when too many bubbles are generated, and the check valve 13
Since the pressing force on the heating pipe 12 becomes smaller, water is supplied from the water tank 2 to the heating pipe 12. When a large amount of water is supplied into the heating pipe 12, bubbles are gradually generated again, and the hot water pushed up into the water rising pipe 8 is again gradually generated by the bubbles in the heating pipe 12, which causes the bubbles to flow through the water discharge hole 9a. , 9b, and the above-described operation is repeated. When the water in the water tank 2 runs out, and furthermore the water in the heating pipe 12 and the water rising pipe 8 run out, the temperature of the heating element 10' rises rapidly. Sensing this, a temperature regulator (not shown) starts operating and keeps the temperature of the heating element constant, so that the coffee in the glass container 14 is kept at a constant temperature. Note that the bubbles in the heating pipe 12 do not only operate as described above, but also increase or decrease in size, so when the bubbles become large, hot water is ejected, and when the bubbles become small, the check valve 13 is opened to supply water for a short time. It often erupts intermittently (2 to 3 seconds).

Moreover, the hot water spouted upward collides with the sprinkler lid 4 and spreads, but if the lower opening □ of the sprinkler lid stand 5 is made equal to or smaller than the upper part, the hot water drips vertically or slightly toward the center.
Since the hot water can be prevented from scattering outside the basket 16, the jetting force can be strengthened to increase diffusion, and the scale diffusion efficiency can be further increased.

By forming the sprinkling lid 4 with glass or heat-resistant transparent synthetic resin, hot water can be seen gushing out from the spouting holes 9a and 9b, allowing the user to visually enjoy the process of making coffee.

Furthermore, since the discharge of hot water can be easily confirmed, there is no need to remove the basket 16 or the glass container 14 by mistake during the discharge, and there is no risk of burns or the like caused by the hot water being discharged, increasing safety. .

Further, if the cross-sectional area of the water spouting holes 9a, 9b is made smaller than the inner cross-sectional area of the water rising pipe, the jetting force will be increased and the diffusion to the water sprinkling lid will be further increased, thereby promoting the above-mentioned effect.

As is clear from the above description, according to the coffee boiler of the present invention, the hot water heated in the heating pipe collides with the sprinkler lid, is diffused and drips into the coffee basket, so that carbon dioxide contained in the water is released. chlorine, etc. are diffused while passing through the sprinkler lid, etc., and therefore the extraction of caffeine and tannins contained in the coffee powder is not inhibited, making it possible to obtain delicious coffee.

It has been said that not only coffee but also tea can be brewed by boiling water for a long time, or by leaving boiling water to stand for a while before serving to obtain a better taste and aroma. It is known from. In order to obtain this effect in a short period of time, the present invention is extremely effective in that the hot water is diffused into small particles or a film to improve the dispersion efficiency. In addition, hot water is poured into the center of the coffee grounds from the downward facing spout hole, and hot water is poured into the outer periphery of the coffee grounds from the upward facing spout hole, so hot water is poured over the entire coffee grounds and the coffee ingredients are extracted. It also has the effect of being carried out efficiently in a short period of time.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a vertical coffee maker showing an embodiment of the present invention, and FIG. 2 is a cross-sectional view of essential parts of the same. 2... Water tank, 3... Heating pipe, 4... Watering lid, 8
...Water rising pipe, 9a, 9b...Water discharge hole, 10...Heating element, 12...Heating pipe, 13...Reverse Stop valve, 14...Glass container, 16...Coffee basket. Figure 2

Claims (1)

[Claims] 1. One end of a heating pipe equipped with a heating device is connected to a water tank via a check valve, and the other end is connected to a water rising pipe,
In a coffee boiler, the upper end of the water rising pipe is opened at the upper part of a basket for filtering coffee powder, and the coffee boiler is provided with a container for receiving coffee at the lower part of the basket, and the opening of the water rising pipe is provided in both directions, A coffee boiler characterized by having a concave water sprinkling lid provided above the opening. 2. The coffee brewer according to claim 1, wherein the opening cross-sectional area of the upward opening is larger than the opening cross-sectional area of the downward opening.