JPH0247208B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a drip type electric coffee brewer.

Conventional Technology Conventionally, a fully automatic coffee boiler in which the coffee bean grinding function and the dripping function are integrated and the function is automatically switched to the dripping function after grinding the coffee beans has been constructed as shown in Fig. 6. are known. That is, the coffee boiler having the configuration shown in FIG. 6 has a container 1 in which a coffee bean grinding chamber and a filtration chamber for extracting coffee liquid and separating the extract and residue are integrated. 1 is a cutter 3 which is rotatably driven by a drive motor 2 inside.
It is equipped with a filter 4 at the bottom to separate the extract and the residue, and after the coffee beans are ground with the cutter 3, the water stored in the tank 5 is integrated with the heater 7 through the check valve 6. The hot water is introduced into the molded water pipe 8, and heated by the steam pressure generated to push up the hot water and lead it to the discharge pipe 8' located above the container 1. Coffee was obtained by pouring.

In general, in order to extract good quality coffee,
The condition is that the extraction be completed in about 3 to 4 minutes using boiling water at a high temperature of 92 to 96 degrees Celsius.

Problems to be Solved by the Invention However, in this configuration, a sufficient temperature increase cannot be expected, and the characteristics of hot water supply, extraction temperature, and time are shown in FIG. In addition, in this Fig. 7, the curve A indicates the hot water temperature;
Further, the curve (b) shows the extraction temperature, and the curve (c) shows the extraction time.

As described above, the coffee extracted by the coffee boiler shown in FIG. 6 has a low extraction temperature and a long extraction time, and as a result, only very bad coffee can be obtained.

The present invention solves these problems,
The purpose is to provide an electric coffee boiler that can optimize the extraction temperature and extraction time, which are the conditions for extracting high-quality coffee, and can also be used to shorten the time it takes to prepare coffee. That is.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention provides a filtration chamber detachably provided in a main body, a tank provided in the main body and containing water, and a filter chamber provided in the main body that contains water. a heater that heats the introduced water; a water pipe that has one end communicating with the bottom of the tank via a check valve and the other end facing a hot water guide whose open end freely moves to the tank and the filtration chamber; This hot water guide is always urged toward the filtration chamber side and is locked on the tank side, and when the water temperature in the tank reaches a predetermined temperature due to circulation, a thermally responsive member is activated by sensing the water temperature. It has a hot water supply switching section that operates a hot water guide to switch from hot water supply to the tank side to hot water supply to the filtration chamber side, and is provided with a manual means for arbitrarily releasing the lock of the hot water guide.

Effect According to the above configuration, after the water temperature in the tank reaches the boiling temperature, hot water is supplied to the filtration chamber side, so it is possible to obtain high-quality coffee with a strong aroma and the original flavor of coffee. It is also possible to move the open end of the hot water guide to the filtration chamber side in advance, so if you do this, the water in the tank will circulate from the tank to the heater and return to the tank again. This means that coffee extraction can be started immediately without having to do so, thereby shortening the coffee preparation time.

Embodiment Hereinafter, an embodiment of the present invention will be described based on the accompanying drawings. In FIGS. 1 to 4, reference numeral 21 denotes a crushing and filtering container, and this crushing and filtering container 21 includes a substantially cylindrical raw material crushing chamber 24 containing a cutter 23 that is rotationally driven by a drive motor 22, and a raw material crushing chamber 24 that is rotatably driven by a drive motor 22. A filtration chamber 25 for accommodating and extracting the coffee beans ground in step 24 is arranged side by side and integrally formed. It communicates through the section 26. In addition, the bottom part 2 of the raw material crushing chamber 24
7 is formed into a mortar shape, and the porous portion 26 is arranged so as to cut a circle drawn by the peripheral wall of the raw material grinding chamber 24, so that when grinding coffee beans, the coffee beans are appropriately stirred and ground uniformly. At the same time, when the particle size becomes appropriate, it is immediately discharged to the filtration chamber 25. In addition, the filtration chamber 25 is formed by a rib 2 having a substantially triangular cross section that extends annularly from the height that contacts the lower edge of the porous portion 26.
8 makes it difficult for crushed and discharged coffee powder to enter the gap between the filter medium 29 and the filter chamber 25 when the paper filter medium 29 is provided. Furthermore, a second
By providing the filter 30, the filter medium 29
This prevents coffee powder entering through the gap between the filter chamber 25 and the coffee liquid from mixing with the coffee liquid. As the filter medium, in addition to the paper filter medium 29, a mesh-like filter medium 31 made of metal or resin can also be used.

32 is a lid of the crushing filter container 21, and this lid 32 has an inclined surface 3 on the part located above the raw material crushing chamber 24.
A dome-shaped protrusion 34 having a diameter of 3 is formed, and a hot water receiver 35 for dispersing hot water during hot water supply and a hole 36 for discharging steam are formed in a portion located above the filtration chamber 25. . Reference numeral 37 denotes a coffee brewer main body, and the left leg 38 of this coffee brewer main body 37 controls a drive motor 22 and the operating time of this drive motor 22, and after the operation is completed, electricity is supplied from the drive motor 22 as will be described later. A timer device (time switch) 40 for switching to the heater 39 is housed, and the right leg portion 4
1 is formed with a tank 42 for storing water.
This tank 42 is connected to a water pipe 44 formed integrally with the heater 39 via a check valve 43 provided at the bottom. Further, the central portion of the coffee boiler main body 37 is a space for storing a coffee receiver 45, and an inclined surface 46 is formed on the upper bridge portion connecting the left and right legs 38, 41. This facilitates the attachment and detachment of the coffee receiver 45 and prevents the steam generated from the coffee accumulated in the coffee receiver 45 from condensing. In addition, the raw material crushing chamber 2
4 and a filtration chamber 25 integrally formed.
1 is detachably attached to the coffee boiler main body 37.

Reference numeral 47 denotes a tapping chamber formed in a dome shape from a transparent heat-resistant resin and for reducing the discharge steam pressure.The upper surface 48 of this tapping chamber 47 has a substantially cylindrical weight lower portion 49 and its outer peripheral portion. A steam discharge hole 50 is provided at the bottom surface 51, and a discharge port 5 is provided on the bottom surface 51 with one end open toward the top surface and the other end connected to the water pipe 44.
2 and a drain port 53 are provided. Also, the water outlet 53
Below, the filter chamber 25 is rotatably supported by the coffee boiler main body 37, and is always supported by a spring 54.
A hot water guide 55 is provided which is biased in the direction of , that is, in the direction of arrow A, and can selectively guide the hot water flowing out from the hot water outlet 53 to either the tank 42 or the filtration chamber 25 through the open end 61. can. Further, the hot water guide 55 is provided with a notch 56.

Reference numeral 57 denotes a thermally responsive member disposed near the bottom of the tank 42. This thermally responsive member 57 is made of a shape memory alloy, and when the water temperature in the tank 42 is low, it succumbs to the tension pressure of the bias spring 58 and becomes compressed. However, when the water temperature reaches the shape memory temperature, the shape memory alloy 57 expands and pushes down the rod 60 integrally formed with the hook 59 in the direction of arrow B. Note that this shape memory alloy 57 is made of a Ni-Ti alloy, has high rust resistance, and is harmless.
The hook 59 of the rod 60 is located where the open end 61 of the hot water guide 55 is located on the tank 42 side.
The hot water guide 55 is engaged with the notch 56 and is locked. Further, one end of the rod 60 protrudes, and by pushing this protrusion 62, the engagement between the hook 59 of the rod 60 and the notch 56 of the hot water guide 55 can be released at any time. 63 is a lid of the coffee boiler body 37, and this lid 63 serves to prevent dust and the like from entering the appliance body.

The operation of the above configuration will now be described.
First, open the lid 63 and open the open end 61 of the hot water guide 55.
is held on the tank 42 side, and then the pulverization filter container 21
Open the lid 32 of the tank 4, put the required amount of coffee beans into the raw material grinding chamber 24, and attach the filter medium 29 so as to tightly contact the side wall of the filtration chamber 25.
2 and close the lids 32 and 63. Next, after setting the time switch 40 to a predetermined time, when electricity is started, the drive motor 22 is activated and the coffee beans are ground. The ground coffee beans are then sequentially discharged into the filter chamber 25 through the porous portions 26. When this discharge is completed, the drive motor 22 is stopped and the power supply to the heater 39 is switched. When this heater 39 is energized, the water pipe 4
The water filled in No. 4 is heated and eventually begins to boil locally. At this time, due to the boiling pressure of the water filled in the water pipe 44, the check valve 4 is placed on the tank 42 side.
3, the hot water is ejected through the discharge port 52 into the receiving chamber 47 without backflow, but the pressure of this ejection is weakened at the lower part 49 of the weight, and the hot water is separated into steam and hot water, and the hot water is discharged through the discharge port 53. It is dripped into the guide 55 and returned to the tank 42 again, and unnecessary parts such as limescale are removed together with steam through the steam exhaust hole 50.
discharge from. When this operation is continuously repeated, the water temperature in the tank 42 gradually rises. Initially, the temperature of the hot water spouted from the discharge port 52 is 80 to 90°C, but as the water temperature in the tank 42 rises, the temperature of the water spouted from the discharge port 52 increases.
The temperature of the water spewed out from 2 also rises, and eventually reaches a boiling state of nearly 100 degrees Celsius. By setting the water temperature in the tank 42 at this time to the memory temperature of the shape memory alloy 57, the shape memory alloy 57 expands against the force of the bias spring 58 and moves the rod 60 downward.
As a result, the engagement between the hook 59 of the rod 60 and the notch 56 of the hot water guide 55 is released, and as a result, the hot water guide 55 rotates so that its open end 61 is located above the filtration chamber 25. As a result, 100℃
The heated hot water is dispersed by the hot water receiver 34 and dripped onto the coffee grounds. In addition, in the initial stage when hot water is circulating through the tank 42 and the water pipe 44, the water pipe 44
4 is an intermittent boiling, so low-temperature hot water is intermittently spouted from the discharge port 52, but when it reaches a continuous boiling state, an extremely large amount of hot water is continuously spouted from the discharge port 52. Spouts hot water at 100℃.
Therefore, a predetermined amount of hot water is continuously supplied to the filtration chamber 25.

FIG. 5a shows the discharge port 52 based on the operation described above.
Figure 5b shows the temporal changes in the temperature of the hot water spouted from the tank 42, the temperature of the water in the tank 42, and the extraction temperature in the filtration chamber 25, and Fig. 5b shows the case where coffee is extracted without circulating hot water. This figure shows the change in temperature over time.

When brewing coffee after circulating hot water, as shown in FIG.
By releasing the engagement between the hook 59 of No. 0 and the notch 56 of the hot water guide 55 and applying electricity in this state, coffee can be brewed in the conventional time.

Effects of the Invention As described above, according to the present invention, by pouring hot water during coffee extraction, the ground coffee beans are sufficiently swollen, so that the filterability can be improved, and as a result, the coffee The extraction efficiency of soluble components contained in powder can be improved. In addition to being able to continuously supply the required amount of hot water in a short period of time, the ideal coffee extraction conditions,
Coffee is extracted at 92 to 96 degrees Celsius using hot water that has been boiled to remove unnecessary components such as limescale, and the extraction can be completed in 3 to 4 minutes, which is not possible with conventional electric coffee boilers. It is possible to obtain high-quality coffee that has a strong aroma and the original flavor of coffee.

It is also possible to move the open end of the hot water guide to the filtration chamber side in advance, so if you do this, the water in the tank will circulate from the tank through the heater and back to the tank again. Instead, coffee extraction starts immediately, thereby shortening the coffee preparation time.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of an electric coffee boiler showing an embodiment of the present invention, FIG. 2 is an exploded perspective view of the same coffee boiler, FIG. 3 is a longitudinal sectional view of the same coffee boiler, Figure 4 is an enlarged cross-sectional view of the main parts of the same coffee boiler, Figure 5a is a graph of coffee extraction temperature and time characteristics during circulation operation in the same coffee boiler, and Figure 5b is a graph of coffee extraction when not circulating. Extraction temperature and time characteristics diagram. Figure 6 is a side sectional view of a conventional fully automatic electric coffee brewer that integrates the coffee bean grinding chamber and the filtration chamber. Figure 7 is a diagram of the coffee brewer shown in Figure 6. It is a coffee extraction temperature time characteristic diagram. 25...Filtering chamber, 37...Main body, 39...Heater, 42...Tank, 43...Check valve, 44...
Water pipe, 55...hot water guide, 57...thermal response member,
61...Open end.

Claims (1)

[Claims] 1. A filtration chamber detachably provided in the main body, a tank provided in the main body and containing water, a heater that heats water introduced from the tank, and one end connected to the tank via a check valve. A water pipe that communicates with the bottom of the water pipe and has its other open end facing a hot water guide that freely moves to the tank and the filtration chamber, and a water pipe that constantly urges the hot water guide toward the filtration chamber and is engaged on the tank side. When the water temperature in the tank reaches a predetermined temperature through circulation, a heat-responsive member that senses the water temperature and operates, releases the lock and operates the hot water guide to supply hot water to the tank side. What is claimed is: 1. An electric coffee boiler comprising: a hot water supply switching unit for switching hot water supply from the hot water supply to the filtration chamber side; and a manual means for arbitrarily releasing the lock of the hot water guide.