JP2835131B2 - Coffee extractor - Google Patents

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial application field) The present invention is to supply water into a heating pipe to make hot water, and to push up the hot water by the boiling pressure to supply the hot water into an extraction case. To a so-called drip coffee extractor.

(Prior Art) A conventional drip coffee extractor is provided with a heater and a heating pipe on the lower surface side of a bottle mounting heating plate located at the bottom of the extractor body, and the heating pipe is used by the heater. While heating, the water supplied into the heating pipe is turned into hot water, and the boiling pressure pushes up the hot water in the hot water supply pipe extending upward from the heating pipe to supply hot water into the extraction case, thereby extracting coffee liquid. I was

In general, Japanese people tend to feel that the hotter the coffee liquid, the better it is. However, in the above-described conventional configuration, in the process in which the hot water generated in the heating pipe rises in the hot water supply pipe, heat is dissipated and the temperature of the hot water drops. Therefore, the temperature of the coffee liquid to be extracted is at most about 80 to 81 ° C., giving the user a feeling that it is slightly cooled (poor and lacking in flavor), which is given to the user by the “drip type is good. Coffee liquid cannot be extracted. "

In order to solve such drawbacks, in recent years, Japanese Patent Application Laid-Open No. 62-28462
As shown in Japanese Patent Publication No. 0, a heater is wound around the outer periphery of the hot water supply pipe, and the hot water supply pipe is heated from the outside by the heater, so that hot water rising in the hot water supply pipe can be additionally heated. It is considered.

(Problems to be Solved by the Invention) According to the configuration described in the above publication, a heater is wound around the outer periphery of the hot water supply pipe rising from the heating pipe, so that the heat of the heater extracts the outer periphery. However, due to the need for a compact extractor body, the hot water supply pipe must be installed in a narrow space inside the extractor main body, and the hot water supply pipe (heater) must be connected to the hot water supply pipe (heater). Since the gap between the extractor main body and the extractor main body becomes narrow, there is a possibility that the extractor main body, which is generally a molded plastic product, is deformed by the heat radiation of the heater. In order to prevent this, it is conceivable to increase the piping space of the hot water supply pipe and to take sufficient heat insulation around the heater, but this would increase the cost, contrary to the demand for compactness.

In addition, the fact that the heat of the heater is dissipated to the outer periphery means that the heat is wasted accordingly, and there is a disadvantage that the heat efficiency is poor.

The present invention has been made in view of such circumstances, and accordingly, the object is to reduce the heat loss while improving the thermal efficiency while satisfying the demand for compactness, and to increase the temperature of the coffee liquid to be extracted. It is an object of the present invention to provide a coffee extractor which can be raised to a temperature preferred by Japanese people.

[Constitution of the Invention] (Means for Solving the Problems) In the coffee extractor according to claim 1 of the present invention, a heating plate having a main heater and a heating pipe is provided at the bottom of the extractor body, and the water is heated. The hot water is supplied into a pipe to form hot water, and the boiling pressure pushes up hot water in a hot water supply passage extending upward from the heating pipe to supply hot water into an extraction case, thereby extracting coffee liquid. At least a portion is constituted by a heater built-in conduit for flowing hot water along the outer peripheral surface of the auxiliary heater, and the hot water flowing in the heater built-in conduit is additionally heated by the auxiliary heater.

In this case, an auxiliary heater made of a sheathed heater is concentrically arranged in the outer tube in the conduit with a built-in heater.
Preferably, both ends of the outer tube are sealed, and a hot water inlet and a hot water outlet are formed near both ends of the outer tube.

Furthermore, it is preferable that a control means is provided for controlling the power cutoff between the main heater and the auxiliary heater, and the control means controls the power cutoff of the auxiliary heater earlier than the main heater.

In this case, as in claim 4, the control means includes a board temperature detecting means for detecting the temperature of the heating board, and a pipe temperature detecting means for detecting the temperature of the heating tube, and the detected temperature of the board temperature detecting means. Control the power cutoff of the main heater based on the
The configuration may be such that the power cutoff of the auxiliary heater is controlled based on the temperature detected by the tube temperature detecting means.

And it is preferable to arrange | position a pipe temperature detection means so that the temperature of the inlet side of a heating pipe may be detected like Claim 5.

Further, the control means may be constituted by a microcomputer.

Further, the temperature of the heating pipe when the auxiliary heater is cut off may be set to be lower than the temperature of the heating plate when re-energizing the main heater is started during the heat retention operation.

(Operation) According to the first aspect, in the process in which the hot water heated in the heating pipe passes through the heater built-in pipe of the hot water supply passage, the hot water contacts the outer peripheral surface of the auxiliary heater and is directly heated. This allows
After the hot water is heated and heated to a high temperature in the heater built-in conduit, the hot water is supplied into the coffee extractor, so that the coffee liquid to be extracted can be heated to a high temperature. In this case, since the hot water surrounds the outer periphery of the auxiliary heater, the heat of the auxiliary heater is efficiently transmitted to the hot water, so that the thermal efficiency is improved and the heat radiation to the outside (extractor body side) is suppressed. .

If the heater built-in pipe is configured as in claim 2, the structure of the heater built-in pipe is simple, and its manufacture is easy.

Furthermore, if the auxiliary heater is controlled so as to be turned off earlier than the main heater, the auxiliary heater is turned off while hot water still flows into the heater built-in pipe. Therefore, a rise in the temperature of the auxiliary heater after the inflow of hot water is stopped is suppressed, and the auxiliary heater is prevented from becoming idle (overheating).

In this case, if the panel temperature detecting means for detecting the temperature of the heating panel and the pipe temperature detecting means for detecting the temperature of the heating pipe are provided, the main heater is provided based on the detected temperatures of both. And the power cutoff control of the auxiliary heater can be separately and accurately performed.

And if the pipe temperature detecting means is arranged to detect the temperature on the inlet side of the heating pipe as in claim 5, the temperature rise of the heating pipe accompanying the decrease of the inflow of water into the heating pipe can be quickly detected. As a result, it is possible to detect early that the remaining water amount has decreased, and it is possible to accurately determine the time when the auxiliary heater should be turned off.

Further, if the control means is constituted by a microcomputer as in claim 6, the control range is widened, and it is possible to easily cope with recent demands for multifunctionality.

Further, if the temperature of the heating pipe at the time of turning off the auxiliary heater is set to be lower than the temperature of the heating plate when re-energizing the main heater is started during the heat retention operation, the auxiliary heater The setting of the power cutoff time is a setting for emphasizing the protection of the auxiliary heater.

(Embodiment) A first embodiment of the present invention will be described below with reference to FIGS.

Reference numeral 1 denotes an extractor main body formed of, for example, plastic, and a heating platen 3 on which a bottle 2 for storing coffee liquid is placed is disposed at the bottom. A main heater 4 made of a sheathed heater, as shown in FIG.
And a heating tube 5 are attached in a U-shape, and the heating tube 5 has an inlet side.
5a is connected to a water outlet 6a of a cartridge type water storage tank 6 (see FIG. 1) mounted on the left rear portion of the extractor main body 1.

On the other hand, a mill case 7 is mounted on the upper left side of the extractor main body 1, and a vertical motor 8 is provided below the mill case 7.
Is provided, and the crushing body 9 provided on the inner bottom of the mill case 7 is driven to rotate by the motor 8. A hopper 10 is provided on the upper part of the mill case 7, and the coffee beans put into the hopper 10 are naturally dropped into the mill case 7 at the time of milling and crushed. The ground coffee powder jumps out of the powder filter 11 provided on the right side of the mill case 7 and falls into the extraction case 12. At this time, in order to prevent the coffee powder from spilling to the outside, a hood section 13 for guiding the coffee powder into the extraction case 12 is provided.
Are formed integrally with the hopper 10. In addition, extraction case 12
Is located above the bottle 2 so that the bottom extraction port 14 faces the top opening of the bottle 2 and houses a paper filter 15 inside.

Next, a hot water supply passage 16 from the heating pipe 5 to the inside of the extraction case 12 is provided.
Will be described. A main component of the hot water supply passage 16 is a heater built-in conduit 17 arranged vertically along the right side surface of the extractor main body 1. This heater built-in pipe
17 is a circular outer tube 18 as shown in FIGS.
An auxiliary heater 19 made of a sheathed heater is provided concentrically inside
The upper and lower ends of the outer tube 18 are sealed as follows. That is, the upper and lower ends of the outer tube 18 are formed by drawing so that the inner diameter thereof is substantially the same as the outer diameter of the protective tube 20 of the auxiliary heater 19 (seed heater), and the outer tube 18 and the protective tube 20 are made identical. Form into length. Then, the upper and lower ends of the outer tube 18 and the protection tube 20 are made to coincide with each other, and the edges thereof are TIG-welded (tungsten-inert gas arc welding) over the entire circumference, so that the two are joined in a sealed state. In this case, SUS444 (stainless steel in which 2% molybdenum is added to low carbon 18% chromium steel) is used as the material of the outer tube 18 and the protection tube 20. The reason is that even if the steel material becomes high temperature by TIG welding, unlike the case of SUS304 (Ni-Cr stainless steel),
This is because the steel material is not martensitic and the grain boundaries are protected by molybdenum, so that the corrosion resistance is good and stress corrosion cracking does not occur even if stress remains after welding. Therefore, although SUS444 is used, the durability of the built-in heater pipe 17 is improved, and the annealing treatment (high temperature treatment at 1050 ° C) for removing the stress after welding is not required, and the cost is reduced by reducing the number of man-hours. There are advantages that can be achieved. In addition, if the annealing process is unnecessary, the auxiliary heater 19 (seed heater)
As the magnesia 21 as a filling insulator in the inside, a low-temperature type with a moisture-proof coating can be used,
It is not necessary to take strict moisture-proof measures by sealing the glass at both ends of the auxiliary heater 19 (seed heater), and it is only necessary to simply seal with an insulating member 22 such as silicon, and the manufacturing is easy and the cost is low. On the other hand, when SUS304 is used, since annealing treatment is required, high-temperature type magnesia (having hygroscopicity) must be used. Since it must be sealed, production is troublesome and costly.

Note that, as a precautionary explanation, the sheathed heater used as the auxiliary heater 19 is, as shown in FIG.
And heat the wire such as a nichrome wire coil between both terminals 23.
The low-temperature magnesia 21 described above is filled around the heating wire 24. In this embodiment, since the insulation distance between both ends (non-charged metal portion) of the outer tube 18 and the protection tube 20 and the terminal 23 which is a charged portion is small,
An insulating tube 25 is placed over the terminal 23 to enhance insulation.

Thus, a cylindrical hot water passage 26 is formed along the outer peripheral surface of the auxiliary heater 19 with the outer tube 18, and a circular hot water passage 26 is formed near both ends of the outer tube 18 in order to pass hot water through the hot water passage 26. Hot water inlet 27 and hot water outlet
28 are formed, and cylindrical connection ports 29 and 30 are formed on both of them.
IG welded. In this case, the connection ports 29 and 30 are also
As with 8, it is made of SUS444 (stainless steel made by adding 2% molybdenum to low carbon 18% chromium steel), thereby improving corrosion resistance and preventing stress corrosion cracking. As shown in FIG. 1, the connection port 29 of the hot water inlet 27 is connected to the outlet of the heating pipe 5 via a connection pipe 31. On the other hand, the connection port 30 of the hot water outlet 28 is connected to the hot water inlet 34 of the steam draining case 33 via the connecting pipe 32. As shown in FIG. 5, the steam draining case 33 has a hot water inlet 34 formed upward on the right side of the bottom surface, and the flow of hot water ejected upward from the hot water inlet 34 An upper surface of the punching case 33 and a buffer wall 35 formed downward from the upper surface.
To be weakened. The hot water whose flow has been weakened in this way slowly flows from the gap below the buffer wall 35 to the hot water outlet 36 side, and the steam is discharged to the outside through the steam vent hole 37 formed on the left side of the upper surface. Is done. And
The hot water that has flowed out of the hot water outlet portion 36, as shown in FIG.
The water is supplied into the extraction case 12 from a pouring hole 39 of a lid portion 38 formed at the lower end of the hood portion 13.

On the other hand, as shown in FIG. 4, a panel temperature detecting thermostat 40 as a panel temperature detecting means for detecting the temperature of the heating panel 3 is provided on the lower surface of the heating panel 3 to control the power cutoff of the main heater 4. . Further, a tube temperature detecting thermostat 41 as a tube temperature detecting means for detecting the temperature of the heating tube 5 is additionally provided on the inlet side 5a of the heating tube 5 in order to control the power cutoff of the auxiliary heater 19.

Next, based on FIG. 6, the main heater 4 and the auxiliary heater 19 will be described.
The configuration of the control circuit 42, which is a control means for controlling the power cutoff, will be described. This control circuit 42 is a panel temperature detection thermostat.
40 and a tube temperature detection thermostat 41, and a series circuit of the tube temperature detection thermostat 41 and the auxiliary heater 19 is connected in parallel to the main heater 4. A panel temperature detection thermostat 40 is provided in a power supply line 43 for supplying power to both heaters 4 and 19. Further, the power supply line 43 is connected between the contacts (ac) of the timer switch 44 and one terminal of the power plug 46 via the lid switch 45. In this case, the lid switch 45 turns on and off in conjunction with the closing and opening of the lid 47 that opens and closes the upper surface of the extractor main body 1. On the other hand, during the operation of the mill, the timer switch 44 is switched so as to turn on between the contacts (ab), so that only the motor 8 for the mill is energized.

In this embodiment, the panel temperature detection thermostat 40
It is set to turn off when the temperature rises to 2 ° C or higher, and to turn on when the temperature drops to 120 ° C or lower. On the other hand, the tube temperature detection thermostat 41 is set to turn off when the temperature reaches 90 ° C. or higher, and to return to on at 70 ° C. or lower. Therefore, in this embodiment, the heating pipe temperature (90 ° C.) when the auxiliary heater 19 is turned off is 30 ° C. lower than the heating platen temperature (120 ° C.) when re-energizing the main heater 4 is started during the heat retaining operation. It is set to be about low.

Next, the operation of the above configuration will be described. When extracting the coffee liquid, first, the desired number of coffee beans are put into the hopper 10, and the desired number of water is put into the water storage tank 6, and the state is set as shown in FIG. Thereafter, when the milling process is started by operating the operation knob (not shown) of the timer switch 44, the contact (ab) of the timer switch 44 is turned on, and the power to the mill motor 8 is turned on. Be started. As a result, the motor 8 rotates and the crushed body 9
Rotates, and coffee beans are sequentially dropped from the hopper 10 and crushed. The ground coffee powder is sequentially discharged from the powder filter 11 and falls into the extraction case 12. When such a milling process is executed for the set time of the timer, the timer switch 44 is automatically switched to turn on the contacts (ac), the motor 8 is stopped and the milling process is completed. Then, the power supply to the main heater 4 and the auxiliary heater 19 is started through the two thermostats 40 and 41, and the extraction process is executed. As a result, the main heater 4 generates heat to heat the heating platen 3, the heating plate 3 is heated by the heating platen 3, and the water supplied from the water storage tank 6 into the heating tube 5 is heated to become hot water. . The hot water is pushed up by the boiling pressure from the hot water inlet 27 of the heater built-in pipe 17 into the hot water passage 26 along the outer peripheral surface of the auxiliary heater 19, and from the hot water outlet 28 at the upper end thereof, a steam vent case is provided.
Squirted into 33. In this case, since the auxiliary heater 19 in the heater built-in pipe 17 is energized and generates heat, the hot water is directly heated by the auxiliary heater 19 in the process of rising along the outer peripheral surface of the auxiliary heater 19. As a result, the hot water is additionally heated in the heater built-in pipe 19, and the temperature of the hot water is raised. The hot water spouted from the hot water outlet 28 into the steam venting case 33 emits steam from the steam venting hole 37 while weakening its flow in the steam venting case 33, and only the hot water is extracted from the hot water outlet 36. The water is dropped onto the lid 38 of the case 12 and the hot water is supplied into the extraction case 12 through the pouring hole 39. The extract is extracted from the coffee powder in the extraction case 12, dropped as a coffee liquid from the extraction port 14, and stored in the bottle 2 kept warm on the heating platen 3. In this case, since the hot water supplied into the extraction case 12 is further heated in the heater built-in conduit 17 and is heated to a high temperature, the conventional coffee liquid temperature (80 to
It is possible to extract hot coffee liquor, which is 85-86 ° C (measured at the extraction port 14), which is about 5 ° C higher than the limit of 81 ° C), which is most preferred by Japanese.

On the other hand, as the extraction process proceeds, the temperature of the heating platen 3 and the temperature of the inlet side 5a of the heating tube 5 change as shown in FIG. That is, at the beginning of energization of the main heater 4, the heating tube 5
The temperature rises quickly until the water boils in the inside, but when the water boils and the hot water is pushed up into the heater built-in pipe 17, the calorific value of the main heater 4 and the heating pipe 5 are supplied. The amount of heat received by water is almost balanced, and the temperature rise curve becomes almost flat. Thereafter, when the remaining water amount in the water storage tank 6 becomes, for example, about one cup (the water amount for one person),
Since the flow rate of water supplied into the heating pipe 5 decreases due to a decrease in the head pressure in the water storage tank 6, the amount of heat received by the water decreases, and the amount of heat generated by the main heater 4 becomes excessive. The temperature on the inlet side 5a of the tube 5 rises rapidly and soon exceeds 90 ° C. At this time, when the tube temperature reaches 90 ° C., the tube temperature detection thermostat 41 is turned off, and the auxiliary heater 19 is turned off. Thereafter, the hot water rising in the heater built-in pipe 17 is further heated by the residual heat of the auxiliary heater 19. Thereafter, when the amount of remaining water in the water storage tank 6 is almost exhausted, the temperature of the heating platen 3 rapidly rises and immediately exceeds 142 ° C. At this time, 142
When the temperature reaches ° C, the panel temperature detection thermostat 40 is turned off, and the main heater 4 is turned off.

When the main heater 4 is turned off, the supply of hot water to the heater built-in pipe 17 is also terminated. In this case, the auxiliary heater 19 in the built-in heater pipe 17 is turned off before the main heater 4 is cut off. The auxiliary heater 19 is turned off while the inflow of hot water into the heater built-in pipe 17 still remains,
The temperature rise of the auxiliary heater 19 after the hot water inflow is stopped is suppressed,
The auxiliary heater 19 is prevented from becoming idle (overheating). In this case, since the amount of remaining hot water after the power failure of the auxiliary heater 19 is small, such a small amount of remaining hot water can be sufficiently heated by the residual heat of the auxiliary heater 19, and the hot water temperature can be maintained until the end. Can be maintained at a high temperature, and the residual heat of the auxiliary heater 19 can be removed by the remaining hot water, so that the auxiliary heater 19 can be more reliably protected.

On the other hand, after the end of the extraction process, the process proceeds to the heat retention process, and when the temperature of the heating panel 3 becomes 120 ° C. or less, the panel temperature detection thermostat 41 returns to ON and restarts the energization to the main heater 4, Thereafter, the heat keeping operation of turning off at 142 ° C. is repeated to keep the coffee liquid in the bottle 2 on the heating board 3 warm.

When the coffee liquid is extracted again after the completion of the extraction process, when the power supply to the auxiliary heater 19 is restarted in a state where the residual heat of the auxiliary heater 19 in the heater built-in pipe 17 is not yet sufficiently cooled, the auxiliary heater 19 is restarted. In this embodiment, when the temperature of the heating tube 5 has not yet decreased to 70 ° C. or less, the tube temperature detection thermostat 41 maintains the off state because the temperature of the heating tube 5 has not yet decreased to 70 ° C. or less. The power supply to the auxiliary heater 19 is blocked to protect the auxiliary heater 19.

According to the above embodiment, an auxiliary heater 19 for additional heating of hot water in the middle of the hot water supply passage 16 is provided inside the outer tube 18 to form a heater built-in conduit 17, and along the outer peripheral surface of the auxiliary heater 19. Since the hot water passage 26 is formed, the hot water surrounds the outer periphery of the auxiliary heater 19, the heat of the auxiliary heater 19 is efficiently transmitted to the hot water, and the heat efficiency is dramatically improved. The preferred hot coffee liquid can be extracted, and the hot water surrounding the outside of the auxiliary heater 19 allows the outer tube 18 to be extracted.
Heat radiation to the outside (extractor body 1 side) of the outer tube 18 is suppressed, so that the outer circumference of the outer tube 18 does not need to be heated to a high temperature. For this reason,
Even if the piping space of the heater built-in pipe 17 in the extractor main body 1 is narrow, there is no need to worry about thermal deformation of the extractor main body 1 due to heat radiation from the heater, and it is possible to sufficiently satisfy the demand for compactness of the extractor main body 1. At the same time, it is not necessary to provide the outer periphery of the heater built-in pipe 17 with a heat insulating structure, and the cost can be reduced from this aspect.

In addition, the heater built-in conduit 17 has an auxiliary heater 19 made of a sheathed heater concentrically arranged inside the outer tube 18, seals both ends of the outer tube 18, and has a hot water inlet near both ends of the outer tube 18. Since the heater 27 and the hot water outlet 28 are formed, the configuration of the heater built-in pipe 17 is simple, the manufacture thereof is easy, and the mass productivity is excellent.

Further, in the above embodiment, the panel temperature detecting means (panel temperature detecting thermostat 40) for detecting the temperature of the heating panel 3 and the pipe temperature detecting means (tube temperature detecting thermostat 41) for detecting the temperature of the heating pipe 5 are provided. Therefore, there is an advantage that the power cutoff of the main heater 4 and the auxiliary heater 19 can be separately and accurately performed based on the detected temperatures of the two.

In this case, since the pipe temperature detecting means (pipe temperature detecting thermostat 41) is arranged so as to detect the temperature of the inlet side 5a of the heating pipe 5, the heating pipe accompanying the decrease in the flow of water into the heating pipe 5 is reduced. 5 has an advantage that it is possible to quickly detect a rise in temperature, to quickly detect that the amount of remaining water has decreased, and to accurately determine when to turn off the auxiliary heater 19.

Further, since the temperature of the heating pipe 5 when the auxiliary heater 19 is turned off is set to be lower than the temperature of the heating panel 3 when re-energizing the main heater 4 is started during the heat retaining operation, the auxiliary The setting of the power cut-off time of the heater 19 is set to emphasize the protection of the auxiliary heater, and the durability can be further improved.

8 and 9 show a second embodiment of the present invention. In this second embodiment, a microcomputer 48 is used as control means for controlling the power cutoff between the main heater 4 and the auxiliary heater 19. And a thermistor 49 is provided as a pipe temperature detecting means for detecting the temperature of the inlet side 5a of the heating pipe 5, while the panel temperature detecting means (panel temperature detecting thermostat 40) is omitted. Hereinafter, a specific circuit configuration will be described with reference to FIG. The motor 8 for the mill, the main heater 4 and the auxiliary heater 19 are connected in parallel to the commercial power source 50, and the motor 8 and the auxiliary heater 1 are each connected to a triac.
51 and 52 are connected in series. A normally open relay switch 53 is connected to the power supply path to the main heater 4 and the auxiliary heater 19.
Are connected in series. On the other hand, part of the AC power supplied from the commercial power supply 50 is rectified to DC by the rectifier circuit 54,
The DC output is supplied to the _VDD terminal and the GND terminal of the microcomputer 48 through the DC power supply lines 55 and 56. A relay driving coil 57 for opening and closing the relay switch 53 is connected in series with the transistor 58 between the two DC power supply lines 55 and 56. The output port R of the microcomputer 48 is connected to the base of the transistor 58. An output voltage of ₁ is applied. Also, between both DC power lines 55 and 56,
A series circuit of a thermistor 49 for detecting the temperature of the heating tube 5 and a voltage dividing resistor 59 is also provided.
A voltage divided V _S by a 59 is read into the microcomputer 48 via the A / D converter. Further, the output ports R ₂ and R _{3 of} the microcomputer 48 are connected to the respective triacs 5.
It is connected to 1,52 gates. An operation input is input to the microcomputer 48 from the operation unit 60, and the content of the operation and the progress of the operation are displayed on the display unit 61.

The microcomputer 48 controls the operation in accordance with the control program shown in FIG. 9, and the details of the control will be described below. First, when starting the mill process by operating the operation unit 60, the triac 51 is turned on is output low level signal from an output port R ₂ of the microcomputer 48, thereby being supplied to the motor 8 (step P1), Coffee beans are crushed. When executing this mill process for a preset time, the output port R ₂ output level is inverted to the high level, the triac 51 is turned off, thereby to the motor 8 is stopped to terminate the mill stroke ( Step P2, P
3) Move to the extraction process. In this extraction process, from the output port R ₁ giving a low-level signal to the base of the transistor 58, the transistor 58 is turned on, by energizing the relay drive coil 57 is turned on the relay switch 53, thereby the main heater 4 Energize (step P4). Furthermore, giving a low-level signal from the output port R ₃ to the gate of the triac 52, the triac 52 is turned on, thereby energizing the auxiliary heater 19 (step P5). Thus, while hot water is being generated in the heating pipe 5, the hot water is additionally heated in the heater built-in pipe 17 and then supplied into the extraction case 12 to extract the coffee liquid. During this extraction process,
The temperature of the inlet side 5a of the heating tube 5 is detected by the thermistor 49, and if the detected temperature does not exceed 90 ° C, both heaters are used.
Continue the energization to 4 and 19 (step P6), then, when it exceeds 90 ° C., the output power level of the ports R ₃ is inverted to the high level, the triac 52 is turned off, whereby the auxiliary heater 19 Is turned off (step P7). Thereafter, a clock pulse counting operation is started, and a predetermined time T (for example, 1 minute 30 seconds to 2 minutes) required for running out of remaining water in the water storage tank 6 is counted (steps P8 and P8).
9). Then, when the time T has elapsed, then inverted to the output level is the high level of the output ports R _1, transistor 58 is turned off, whereby the relay switch 53 relay drive coil 57 is deenergized is turned off, The main heater 4 is turned off (step P10). Thus, the extraction process is completed and the process shifts to the warming process. In this heat retaining step, as in the first embodiment described above, when the temperature of the heating panel 3 becomes 142 ° C. or more, the main heater 4 is turned off, and when the temperature falls to 120 ° C. or less, the main In order to perform the heat retention operation of starting the re-energization of the heater 4, when the temperature detected by the thermistor 49 of the heating tube 5 exceeds 130 ° C as shown in steps P11 to P14 (at this time, as shown in FIG. 7). When the temperature of the heating panel 3 exceeds 142 ° C.), the relay switch 53 is turned off, the main heater 4 is turned off, and the detected temperature of the heating tube 5 falls below 120 ° C. (The temperature is reduced to 120 ° C. or less), and the warming operation of turning on the relay switch 53 and re-energizing the main heater 4 is started.

In the second embodiment, since the control means is constituted by the microcomputer 48, one temperature detecting means (thermistor 4) is provided.
According to 9), the same control as in the case of using the two temperature detecting means as in the first embodiment can be performed.

However, even when the microcomputer 48 is used as in the second embodiment, a panel temperature detecting means (thermistor) for detecting the temperature of the heating platen 3 is provided in addition to the pipe temperature detecting means (thermistor 49). Needless to say, the configuration may be such that the power cutoff of the main heater 4 is controlled based on the temperature detected by the panel temperature detecting means.

Further, the structure of the heater built-in pipe 17 is not limited to that of the first embodiment. For example, as in the third embodiment of the present invention shown in FIG. The outer diameter of both ends of the protective tube 20 may be formed to be the same as the inner diameter of the outer tube 18 by pushing and expanding in a trumpet shape, and the two may be sealed by TIG welding. In this case, since the insulation distance between the terminal 23 and the edge of the protection tube 20 which is a non-charging part can be increased, there is no need to cover the terminal 23 with the insulation tube 25 as in the first embodiment. The terminal processing is facilitated, and the work of welding the protective tube 20 and the outer tube 18 is also facilitated in terms of space.

Further, as in the fourth embodiment of the present invention shown in FIG. 11, the hot water outlet 62 and the hot water inlet (not shown) of the heater built-in pipe 17 are formed into a cylindrical shape by burring, and these hot water outlets 62 are formed. After trimming the edge of the hot water inlet into a flat shape,
TIG welding may be performed.

In this case, since the edges of the hot water outlet 62 and the hot water inlet can be made flat by simple trimming, there is no need to cut the edge of the connection port body 63 in accordance with the curved surface of the outer tube 18, which is troublesome. Can be omitted. In addition, since the welding of the two is planar welding, the welding operation is facilitated. Furthermore, since the welded portion is separated from the outer peripheral surface of the outer tube 18, the welded portion does not protrude inside the outer tube 18, and the gap between the outer tube 18 and the outer peripheral surface of the auxiliary heater 19 can be made uniform, and welding can be performed. The flow of the hot water in the hot water passage 26 is not obstructed by the portion. Moreover, since the welded portion does not protrude inside the outer tube 18, the gap between the outer tube 18 and the outer peripheral surface of the auxiliary heater 19 can be set to be narrow, which is very important for a home coffee extractor. While solving the problem of miniaturization,
The contact between the hot water and the auxiliary heater 19 can be improved, and the thermal efficiency can be further improved.

Although the first and second embodiments are examples of the coffee extractor with a mill function, the present invention can also be applied to an exclusive coffee extractor without the mill function.

In the present embodiment, the temperature of the thermostat or the like is set so that the extraction temperature is 85 ° C. to 86 ° C. However, the extraction temperature does not necessarily need to be in this temperature range. May be appropriately changed.

[Effects of the Invention] As is clear from the above description, according to claim 1,
At least a part of the hot water supply passage is constituted by a heater built-in pipe through which hot water flows along the outer peripheral surface of the auxiliary heater, and the hot water flowing in the heater built-in pipe is additionally heated by the auxiliary heater. The temperature of the coffee liquid to be heated can be efficiently raised to a high temperature, and the heat loss can be reduced to improve the thermal efficiency. In addition, since heat radiation to the outside of the heater built-in pipe (extractor main body side) is suppressed, even if the piping space of the heater built-in pipe is narrow, there is no risk of thermal deformation of the extractor main body, and the extractor main body is compact. Requirements can be fully satisfied.

And, as in claim 2, an auxiliary heater made of a sheathed heater is concentrically arranged in the outer tube with the heater built-in conduit, and both ends of the outer tube are sealed, and hot water is placed near both ends of the outer tube. With the configuration in which the inlet and the hot water outlet are formed, the configuration of the conduit with a built-in heater is simple, the production thereof is easy, and the mass productivity can be improved.

Furthermore, if the auxiliary heater is controlled so as to be turned off earlier than the main heater, the auxiliary heater is turned off while hot water still flows into the heater built-in pipe. Therefore, it is possible to prevent the auxiliary heater from being in the idling state (overheating state), and to improve the durability of the auxiliary heater.

In this case, if the panel temperature detecting means for detecting the temperature of the heating panel and the pipe temperature detecting means for detecting the temperature of the heating pipe are provided, the main heater is provided based on the detected temperatures of both. And the power cutoff control of the auxiliary heater can be separately and accurately performed.

And if the pipe temperature detecting means is arranged so as to detect the temperature on the inlet side of the heating pipe as in claim 5, the temperature rise of the heating pipe accompanying the decrease of the inflow of water into the heating pipe can be quickly increased. Thus, it is possible to detect at an early stage that the remaining water amount has decreased, and it is possible to accurately determine when the power to the auxiliary heater should be cut off.

Further, if the control means is constituted by a microcomputer as in claim 6, the control range is widened, and it is possible to easily cope with recent demands for multifunctionality.

Further, if the temperature of the heating pipe at the time of turning off the auxiliary heater is set to be lower than the temperature of the heating plate when re-energizing the main heater is started during the heat retention operation, the auxiliary heater The setting of the power cutoff time can be set to emphasize the protection of the auxiliary heater.

[Brief description of the drawings]

FIGS. 1 to 7 show a first embodiment of the present invention. FIG. 1 is a front view of an entire vertical section, FIG. 2 is a front view of a heater built-in pipe, and FIG. Partial enlarged longitudinal front view, fourth
FIG. 5 is a bottom view of the heating plate, FIG. 5 is an enlarged vertical sectional front view of the steam vent case, FIG. 6 is an electric circuit diagram, and FIG. 7 is a change diagram of the heating plate temperature and the heating tube temperature with time. FIGS. 8 and 9 show a second embodiment of the present invention. FIG. 8 is an electric circuit diagram, and FIG. 9 is a flowchart showing control contents by a microcomputer. FIG. 10 is a diagram corresponding to FIG. 3 showing a third embodiment of the present invention, and FIG. 11 is a diagram corresponding to FIG. 3 showing a fourth embodiment of the present invention. In the drawing, 1 is an extractor body, 2 is a bottle, 3 is a heating plate, 4
Is a main heater, 5 is a heating pipe, 6 is a water storage tank, 7 is a mill case, 8 is a motor, 9 is a crushed body, 12 is an extraction case, 16 is a hot water supply passage, 17 is a heater built-in pipe, 18 is an outer pipe, 19 Is an auxiliary heater, 20 is a protection tube, 21 is magnesia, 22 is a sealing member,
26 is a hot water passage, 27 is a hot water inlet, 28 is a hot water outlet, 33 is a steam vent case, 40 is a panel temperature detection thermostat (panel temperature detection means), 41 is a pipe temperature detection thermostat (tube temperature detection means), and 42 is a control A circuit (control means), 48 is a microcomputer (control means), 49 is a thermistor (tube temperature detecting means), and 62 is a hot water outlet.

Continued on the front page (72) Inventor Fumihiro Imamura 4-21 Yoshiwara-cho, Nishi-ku, Nagoya City, Aichi Prefecture Inside the Toshiba Nagoya Plant (72) Inventor Katsunori 4-21 Yoshihara-cho, Nishi-ku, Nagoya City, Aichi Prefecture Toshiba Nagoya Co., Ltd. Inside the factory (72) Inventor Kenzo Ito 4-21 Yoshihara-cho, Nishi-ku, Nagoya-shi, Aichi Pref. Toshiba Nagoya Factory (58) Fields investigated (Int. Cl. ⁶ , DB name) A47J 31/00-31/60

Claims (7)

(57) [Claims] A heating plate having a main heater and a heating tube is provided at the bottom of an extractor body, water is supplied into the heating tube to make hot water, and a hot water supply passage extending upward from the heating tube by its boiling pressure. In a coffee extractor configured to extract coffee liquid by pushing up hot water and supplying hot water into an extraction case, at least a part of the hot water supply passage includes a heater built-in pipe through which hot water flows along an outer peripheral surface of an auxiliary heater. A hot water flowing in the heater built-in pipe is heated by the auxiliary heater. 2. A heater built-in conduit, wherein an auxiliary heater made of a sheathed heater is concentrically arranged in an outer tube to seal both ends of the outer tube, and a hot water inlet and a hot water outlet near both ends of the outer tube. The coffee extractor according to claim 1, wherein the coffee extractor is formed. 3. The apparatus according to claim 1, further comprising control means for controlling the power cutoff between the main heater and the auxiliary heater, wherein the control means controls the auxiliary heater to be turned off earlier than the main heater. Or the coffee extractor according to 2. 4. The control means comprises: a board temperature detecting means for detecting a temperature of a heating board; and a pipe temperature detecting means for detecting a temperature of a heating pipe, and a main heater is provided based on the detected temperature of the board temperature detecting means. 4. The coffee extractor according to claim 3, wherein the control unit controls the power cutoff of the auxiliary heater and controls the power cutoff of the auxiliary heater based on the temperature detected by the tube temperature detecting means. 5. The coffee extractor according to claim 4, wherein the pipe temperature detecting means is arranged to detect a temperature at an inlet side of the heating pipe. 6. The coffee extractor according to claim 3, wherein the control means is constituted by a microcomputer. 7. The heating pipe temperature when the auxiliary heater is turned off is set to be lower than the heating board temperature when re-energizing the main heater is started during the heat retaining operation. Item 7. A coffee extractor according to any one of Items 4 to 6.