JPH03297423A - Extraction process display device for extractor - Google Patents

Abstract

PURPOSE:To improve the sensitive characteristic of a temperature detection element and display the process of extraction with precision, by providing a thermistor, to be the temperature detection element, in parallel with the longitudial direction of a water introduction pipe, and covering its outside portion with a heat contraction tube. CONSTITUTION:A thermistor 13 of a temperature detection element 12 is installed in a water introduction pipe 8, and its outer portion is covered with a heat contraction tube 14, and is constituted by contracting the tube 14 through heating, so a space between the thermistor 13 and the tube 14 is small. The temperature detection element 12 is provided in parallel with the longitudial direction of the water introduction pipe 8, and fitted by means of a seal material 15 formed out of rubber. A temperature detection circuit 16 receives the output of the element 12, and compares it with a set reference value, and in the case of its voltage being higher than the reference value, the output of a comparator becomes low, and a display light is lighted. The lighting of the display light 18 continues while the temperature of the element 12 is high, and when the temperature lowers, voltage at an A point becomes lower than the reference value, and the output of the comparator 17 becomes of a high level, and the display light 18 is turned off.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a brewing process display device for a brewing machine such as a coffee maker.

BACKGROUND OF THE INVENTION In recent years, brewing machines such as coffee makers have become widespread, and there is a demand for improved usability.

Conventional extractors of this type generally have a configuration as shown in FIG. The configuration will be explained below.

As shown in the figure, a heating element 2 is attached to the lower periphery of the container 1, and a temperature regulator 3 is provided outside the bottom surface. container 1
A container lid 4 is provided above the container 1 in a sealed state. A tank 5 is provided above the container lid 4, a first opening 5a is provided at the bottom of the tank 5, one end is attached to the first opening 5a, and the other end is opened downward into the container 1. A water supply pipe is provided, and this water supply pipe is disposed so as to penetrate through the second opening 4a of the container lid 4. The third opening 4b of the container lid 4 is provided to penetrate an air cylinder 7 that opens above the tank 5. The fourth opening 4c of the container lid 4 is provided as a through hole for a water guide pipe 8, and one end of the water guide pipe 8 is bent into a substantially U-shape with a water intake port 8a located above the container 1. A discharge port 8b is provided at the end. Below the discharge port 8b is a basket 9 for storing coffee powder, and below the basket 9 is a decanter 1 for storing coffee liquid.
0 is placed. A lid 11 is provided above the tank 5 and has a water supply port 11a for putting water therein.

The operation in the above configuration will be explained. When water is poured from the water supply port 11a, the water enters the container 1 from the first opening 5a of the tank 5 through the water supply pipe.

When the water level in the container 1 rises and water is supplied above the water guide pipe 8, the water in the container 1 passes through the water guide pipe 8 to the outlet 8.
Water is drained from b. Drainage occurs, the water level drops, and the water intake port 8
When the water level becomes the same as a, since air is simultaneously entering the container 1 through the air cylinder 7, air also enters the water guide pipe 8 through the water intake port 8a, and the siphon principle no longer works in the water guide pipe 8. , drainage stops. In this state, when electricity is passed through the heating element 2 to heat it, the water in the container 1 is heated. When the water temperature rises to the set temperature of the temperature regulator 3, the temperature regulator 3 operates to stop supplying electricity to the heating element 2. After that, coffee powder is placed in the basket 9 and water is supplied again from the water supply port 11a.The heated hot water in the container 1 is discharged from the discharge port 8b via the water guide pipe 8, and the water in the basket 9 is The coffee liquid is poured onto the coffee grounds and drips into the decanter 10.

Problems to be Solved by the Invention In such a conventional extraction machine, it takes about 3 minutes to discharge the hot water, and it takes another 1 to 2 minutes for the hot water to come into contact with the coffee powder in the basket 9 and complete the extraction. It takes time. Moreover, the only way to tell whether or not coffee is brewing is to check if the coffee liquid is dripping from the gap between the basket 9 and the decanter 10, and it is difficult to see if there is coffee liquid dripping from the gap between the basket 9 and the decanter 10. There were problems such as spills and burns.

The present invention solves the above problems, and aims to improve the sensitivity characteristics of a temperature detection element that detects the temperature of a water pipe through which hot water passes during extraction, and to accurately display the temperature from the start of discharging hot water until the completion of extraction. is the primary objective. A second purpose is to make the passage of hot water through the water pipe smoother, thereby making it easier to correlate the sensing characteristics of the temperature detection element with extraction, and improving the reliability of the extraction process display.

Means for Solving the Problems In order to achieve the first object, the present invention provides a heating element for heating water, a water guide pipe for supplying heated hot water to an extraction device, and a water guide pipe installed in the water guide pipe. The present invention includes a temperature detection circuit that operates based on the output of a temperature detection element, and an indicator light that blinks based on the output of the temperature detection circuit, the temperature detection element being composed of a thermistor, and the thermistor being covered with a heat shrink tube. This is the first means of solving problems.

In order to achieve the second objective, in addition to the first problem solving means, the thermistor is located within the water guide pipe, and the longitudinal direction of the element is arranged parallel to the water channel of the water guide pipe. This is a means of solving the second problem.

Effect of the Invention The present invention uses the above-mentioned first problem-solving means. When the hot water for coffee extraction passes through the water guide pipe, the temperature detection element detects the temperature rise, and the indicator lamp lights up via the temperature detection circuit, causing the hot water to flow through the water pipe. Once the water has passed through the water pipe, the temperature of the temperature detection element will drop and the indicator light will turn off, allowing the extraction process to be displayed. Furthermore, the distance between the thermistor and the heat shrinkable tube can be made as small as possible, so that the sensing characteristics of the thermistor can be improved when hot water passes through the water guide pipe, and the lighting and extinguishing characteristics can be improved. In addition, according to the second problem solving means, the front and rear lead parts of a thermistor are usually smaller in diameter than the thermistor, so when hot water passes through the water pipe, the large diameter part of the heat-shrinkable chineap is successively smaller than the small diameter part. This will allow the hot water to pass through it more smoothly.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to FIGS. 1 to 5. Note that components having the same configuration as those of the conventional example are given the same reference numerals, and description thereof will be omitted.

As shown in the figure, the temperature detection element 12 is installed inside the water guide pipe 8, the thermistor 13 and the outside of the thermistor 13 are covered with a heat shrink tube 14, and the heat shrink tube 14 is heated.
It is constructed by contracting 4. For this reason, thermistor 1
3 and heat-shrinkable chineef] The space between 4 is smaller. Also, normally, the lead parts before and after the thermistor 13 are smaller than the diameter of the thermistor 13, so the thermistor 13
3 is covered with a heat shrink tube 14, the outer diameter of the heat shrink tube 14 becomes smaller at the lead portion as shown in FIG.

This temperature detection element 12 is arranged parallel to the longitudinal direction of the water guide pipe 8 as shown in FIG.
It is installed with. The temperature detection circuit 16 is the temperature detection element 1
When the voltage at point A is higher than the reference value (when the temperature of the temperature detection element 12 is high), the output of the comparator 17 becomes low and the indicator light 18 lights up. . This indicator light 18 is arranged at a position where it can be seen from the outside of the aircraft. The indicator light 18 continues to be lit while the temperature of the temperature detection element 12 is high, and when the temperature of the temperature detection element 12 decreases, the voltage at point A becomes lower than the reference value, and the output of the comparator 17 becomes high level, indicating that the indicator light 18 goes out. According to experiments, extraction is completed when the temperature of the temperature detection element 12 reaches approximately 70°C.
The output of 2 is used as the reference value. Further, it takes about 4 to 5 seconds for the temperature detection element 12 to reach this temperature when extraction is started.

The operation of the above configuration will be explained with reference to FIG. When water is poured from the water supply port 11a, the water enters the container 1 from the first opening 5a of the tank 5 through the water supply pipe. When the water level in the container 1 rises and water is supplied above the water guide pipe 8, the water in the container 1 passes through the water guide pipe 8 to the outlet 8.
Water is drained from b. Drainage occurs, the water level drops, and the water intake port 8
When the water level becomes the same as a, since air is simultaneously entering the container 1 through the air cylinder 7, air also enters the water guide pipe 8 through the water intake port 8a, and the siphon principle no longer works in the water guide pipe 8. , drainage stops. In this state, when electricity is passed through the heating element 2 to heat it, the water in the container 1 is heated. When the water temperature rises to approximately 95°C, the temperature reaches the set temperature of the temperature controller 3, and the temperature controller 3 operates, causing the heating element 2 to rise.
Stop energizing. After that, coffee powder is put in the basket 9 and set, and water is supplied again from the water supply port 11a, and the heated hot water in the container 1 is discharged from the discharge port 8b via the water guide pipe 8, and the coffee inside the basket 9 is drained. The coffee liquid is poured onto the powder and dripped into the decanter 10. The temperature of the temperature detection element 12 during extraction increases when hot water starts to be discharged, and the temperature becomes higher than the reference value. Therefore, the temperature detection circuit 16 energizes the indicator light 18, and the indicator light 18 lights up. When the discharge of hot water is finished, the temperature detection element 12
cooling starts and the temperature gradually decreases. basket 9
Temperature detection element 12 when coffee extraction is completed within
When the reference value is set to the temperature of
Stop energizing. Therefore, the indicator light 18 can indicate that the extraction process is in progress.

As described above, according to the extraction display device for the extractor according to the embodiment of the present invention, the temperature detection element 12 is constituted by the thermistor 13, and the thermistor 13 is covered with the heat shrink tube 14. 14 becomes smaller, and as soon as hot water passes through the water guide pipe 8, heat is transferred to the thermistor 13. As soon as the hot water finishes passing through the water guide pipe 8, cooling starts, and the thermistor 13 receives the heat. The sensitivity characteristics are improved, and the lighting and extinguishing characteristics of the indicator lamp 18 are improved. Moreover, since the thermistor 13 is arranged with the longitudinal direction of the element parallel to the water channel of the water guide pipe 8, when hot water passes through the water guide pipe 8, it flows sequentially from the small diameter part to the large diameter part of the heat shrink tube 14. The passage of hot water becomes smoother, and the sensitivity characteristics of the thermistor 13 are more easily correlated with extraction.

Effects of the Invention As is clear from the above embodiments, according to the present invention, the temperature detection element is composed of a thermistor and the thermistor is covered with a heat shrinkable tube, so that the space between the thermistor and the heat shrinkable tube is minimized. The sensitivity characteristics of the thermistor can be improved, and from the start of dispensing hot water until the completion of extraction,
In addition, since the thermistor is placed parallel to the water guide pipe, when hot water passes through the water guide pipe, it flows from the small diameter part of the heat shrink tube to the large diameter part of the thermistor, and the hot water is The passage becomes smoother, and the sensitivity characteristics of the thermistor can be more easily correlated with coffee extraction, making it possible to display the extraction process with high reliability. Therefore, the indicator light can be turned on from the start of dispensing hot water to the completion of coffee extraction, making it visible from the outside, making it safe and easy to use without accidentally pulling out the basket or carafe. It has great practical value as it can be supplied at low cost.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of an extractor equipped with an extraction process display device according to an embodiment of the present invention, Fig. 2 is an enlarged sectional view of a temperature detection element of the extraction process display device, and Fig. 3 is an enlarged sectional view of the temperature detection element of the same extraction process display device. Fig. 4 is an electric circuit diagram of the extraction process display device, Fig. 5 is a perspective view of the extractor equipped with the extraction process display device, and Fig. 6 is the extraction process display device. FIG. 7 is a sectional view of a conventional extractor. 2... Heating element, 8... Water guide pipe, 1
2...Temperature detection element, 13...Thermistor, 14...Heat shrink tube, 16...
...Temperature detection circuit, 18...Indicator light.

Claims (2)

[Claims] (1) A heating element that heats water, a water guide pipe that supplies heated hot water to the extraction device, a temperature detection circuit that operates based on the output of a temperature detection element installed in the water guide pipe, and a temperature detection circuit that operates based on the output of a temperature detection element installed in the water guide pipe. An extraction process display device for an extractor, comprising an indicator light that blinks depending on the output, the temperature detection element being a thermistor, and the thermistor being covered with a heat shrink tube. (2) The extraction process display device for an extractor according to claim 1, wherein the thermistor is located within the water guide pipe and the longitudinal direction of the element is arranged parallel to the water channel of the water guide pipe.