JPS6330355Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a coffee brewer that improves thermal response by improving the mounting structure of a thermal switch that controls power on/off of a heater.

[Technical background of the invention and its problems]

Conventional coffee brewers generally have a structure in which a pipe is connected to the water tank via a check valve, and the middle of this pipe is attached to the heating part so that the tip faces into the coffee liquid extraction part. Water flowing into the pipe via the check valve is heated and boiled in the heating section and supplied into the extraction section, and the extracted coffee liquid is dripped and stored in a predetermined container. After all the water in the water tank is boiled and supplied to the extraction section, a thermal switch installed in the center of the heating section detects the temperature rise in the heating section, and when the predetermined temperature is reached, the heater in the heating section is turned off. After the power is cut off, the temperature of the heating section is controlled by turning on and off this thermal switch to heat and keep the coffee liquid in the container warm. However, since the heating part has a large heat capacity, the temperature of the heating part does not drop immediately after the thermal switch is opened and remains slightly overheated, and even after the thermal switch is closed, the temperature of the heating part does not rise immediately. As a result, the control temperature range of the heating section becomes large, making it difficult to keep the coffee liquid at a desired temperature.

As a solution to this problem, Jikoko 56-8350
As shown in FIG.
A thermal switch c is attached to the lower surface of the protrusion b, and the thermal switch c senses the temperature of the protrusion b, which has a small heat capacity, in order to reduce its control temperature range. In Fig. 1, d is a heater attached to the lower surface of the heating section a, and e is a pipe fitted into a groove f formed continuously on the upper surface of the heating section a and the projection b. Water from the water tank does not pass through. However, even with this configuration, since the protrusion b is formed integrally with the heating part a, the temperature of the protrusion b tends to depend on the temperature of the heating part a, which has a large heat capacity, and the control temperature width of the heating part is limited. However, the reduction of the heating part a is still insufficient, and the protrusion b must be integrally provided on the heating part a, which is disadvantageous in terms of material cost and molding.

[Purpose of invention]

An object of the present invention is to provide a coffee brewer that can reduce the control temperature range of the heating section using a thermal switch without the need for protruding projections on the heating section.

[Summary of the idea]

The present invention includes a pipe for supplying hot water into an extraction section storing coffee powder, a water tank for supplying water into the pipe, a heater and a midway portion of the pipe, and water supplied from the water tank into the pipe. a heating section that heats the coffee liquid and stores a container for storing coffee liquid from the extraction section to keep it warm; and a thermal switch that controls turning on and off of the heater,
A flat part is formed in the part of the pipe that is attached to the heating part, and the thermal switch is attached to this flat part in a heat conductive manner, so that the thermal switch converts all the water in the water tank into hot water. The purpose of this technology is to sense the temperature of the pipe, which becomes empty and has a smaller heat capacity after it has been emptied, thereby making it possible to further reduce the control temperature range.

[Example of idea]

An embodiment of the present invention will be described below with reference to FIGS. 2 to 4. First, in Fig. 2, 1 is the body of a coffee extractor with a mill mechanism;
A motor storage chamber 2 and a cup mounting table 3 are formed on both left and right sides of the lower half, and a case storage chamber 4 and a water tank 5 are formed on both left and right sides of the upper half.
Reference numeral 6 denotes a case serving as an extraction unit that is removably housed in the case storage chamber 4, and this case 6 has a filter 7 attached to the bottom of the interior, and a receiver 8 attached to the bottom.
An extraction port 8a is formed at the lowest part of the inclined bottom. 9 is a mill mechanism that grinds coffee beans,
This mill mechanism 9 has a drive motor 10 arranged vertically in the motor storage chamber 2, and a cutter 11 attached to a rotating shaft 10a of the drive motor 10 protruding into the case 6.
It is constructed by attaching it detachably. 12
is a water pourer detachably attached to the upper opening of the case 6, which is formed in the shape of a shallow cylindrical container with an upwardly bulging approximately spherical protrusion; molten metal pouring holes 13 are formed. Reference numeral 14 denotes a heating plate which is a heating unit fixedly arranged inside the cup mounting table 3. The upper surface of this heating plate is exposed to the outside through a circular opening 15 formed in the cup placing table 3. A cup 16, which is a container for storing coffee liquid, is removably placed on the top surface.
In this state where the cup 16 is placed, the extraction port 8a of the receiver 8 faces into the cup 16. A first groove 14a having a substantially inverted U-shaped cross section is formed on the lower surface of the heating plate 14 along its outer periphery, and a first groove 14a also having a substantially inverted U-shaped cross section is formed inside the first groove 14a. A second groove 14b is formed. 1
7 is a pipe, 18 is a heater such as a sheathed heater, and the pipe 17 is connected to the first groove 1 of the heating plate 14.
The heater 18 is fitted into the second groove 14b of the heating plate 14 and fixed by caulking or the like.
In this case, the pipe 17 is fixed so that its lower part protrudes a certain amount from the first groove 14a. Both ends of the pipe 17 are extended upward, one end is connected to the water tank 5 via a check valve (not shown), and the other end is connected to the water tank 5 for supplying hot water to the water pourer 12. The hot water supply pipe 19 is connected to be rotatable in the horizontal direction. The part of the pipe 17 attached to the heating plate 14 is flattened locally on the side connected to the water tank 5, for example, so that it is approximately flush with the lower surface of the heating plate 14, as shown in FIG. A flat portion 20 is formed. Reference numeral 21 denotes a thermal switch connected in series with the heater 18, which is connected to the mounting plate portion 21 in such a way that its heat-sensitive portion is brought into direct contact with the flat portion 20 of the pipe 17 so as to be able to conduct heat.
Both sides of a are fixed to the lower surface of the heating plate 14 with screws 22. In addition, in FIG. 1, 23 is a lid that covers the case storage chamber 4 and the water tank 5 all at once.

Next, the operation of the above configuration will be explained. First, fill the water tank 5 with an amount of water equivalent to the number of people desired, store the corresponding amount of Kose beans in the case 6, attach the water pourer 12 to the top opening of the case 6, and open the cup 16. is placed on the heating plate 14. Then, rotate the hot water pipe 19 to
A is positioned directly above the water pourer 12, and then the lid 23 is placed on it. Thereafter, when the drive motor 10 of the mill mechanism 9 is energized, the cutter 11 rotates and grinds the coffee beans in the case 6. After grinding the coffee beans, the drive motor 10 is de-energized and the heater 18 is turned off.
By supplying electricity to generate heat, the cup 16 is preheated, and at the same time, water supplied from the water tank 5 into the pipe 17 is heated to generate hot water.
This hot water rises due to boiling pressure and reaches the hot water pipe 1.
9 and is discharged onto the pourer 12 from the hot water supply port 19a. The hot water drips into the case 6 from the pouring hole 13 and permeates into the coffee powder, passes through the filter 7, is extracted as coffee liquid, flows out from the extraction port 8a, and is stored in the cup 16. Now, during the extraction of the coffee liquid as described above, water is being boiled in the pipe 17, so the pipe 17 is not heated above 100°C, and therefore the thermal switch 21 is kept in the closed state. The heater 18 is kept energized. When the water in the water tank 5 runs out, all the water in the pipe 17 evaporates and the pipe 17 becomes empty. In this case, the pipe 17 is in an unfired state and its heat capacity is small, so when the temperature rises rapidly and reaches a predetermined temperature, the thermal switch 21 is opened and the heater 18 is cut off. When the heater 18 is turned off, cooling of the heating plate 14 begins, but since the flat part 20 of the pipe 17 to which the thermal switch 21 is attached is empty and has a small heat capacity, it is quickly cooled and the heating plate 14 is cooled down quickly.
Even if the temperature does not drop that much, it quickly drops to a predetermined temperature, and as a result, the thermal switch 21 closes and energizes the heater 18. When the heater 18 is energized, the flat part 20 of the pipe 17 has a small heat capacity as described above, so the temperature rises quickly and rises to the set temperature in a short time, and the thermal switch 21 is opened and the temperature is turned off to the heater 18. Cut the line. Thereafter, the thermal switch 21 repeats closing and opening as described above, thereby controlling the temperature range of the heating plate 14 to be smaller.

[Effects of the invention] As explained above, the present invention is characterized in that a flat part is formed in the part of the pipe that is attached to the heating part, and a thermal switch is attached to this flat part. After the water in the water tank runs out, the flat part becomes empty and has a small heat capacity, and the temperature rises and falls quickly. Therefore, thermal switches do not allow the temperature of the heating part to drop or rise by that much. Even if it is not, the heater will be closed or opened early to turn off the electricity to the heater, and the control temperature range of the heating section will become smaller, making it possible to reliably keep the coffee liquid at the desired set temperature. can. In addition, since a flat part is formed on the pipe and the thermal switch is attached to the flat part, the structure for attaching the thermal switch to detect the temperature of the pipe is extremely simple, and unlike conventional methods. Since there is no need to provide a protrusion on the heating part for attaching the thermal switch, material costs can be reduced and it is advantageous in manufacturing.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing an example of the mounting configuration of a conventional thermal switch, Figs. 2 to 4 show an embodiment of the present invention, Fig. 2 is an overall vertical sectional view, The figure is a bottom view of the heating plate, and Figure 4 is in Figure 3.
FIG. 3 is an enlarged vertical cross-sectional view taken along the line. In the figure, 5 is a water tank, 6 is a case (extraction part),
14 is a heating plate (heating part), 16 is a cup (container),
17 is a pipe, 18 is a heater, 20 is a flat part, 2
1 is a thermal switch.

Claims (1)

[Scope of utility model registration request] A pipe for supplying hot water into an extraction part storing coffee powder, a water tank for supplying water into this pipe, a heater and a middle part of the pipe are installed, and the water supplied from the water tank to the pipe is heated. A heating section for placing a container for storing coffee liquid from the extraction section to keep it warm; and a thermal switch for controlling power on/off of the heater; 1. A coffee brewing machine, comprising: a support portion; and the thermal switch is attached to the flat support portion in a heat conductive manner.