JPS6228251Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Field of industrial application This invention relates to an electric jar pot, and more specifically to a mechanism for preventing the electric jar pot from drying out.

(B) Prior Art Generally, as shown in Fig. 1, an electric jar pot includes a heat insulating jar pot main body 3 having an outer cylinder 1 and an inner cylinder 2, and a heater 4 attached to the inner cylinder in a body wrapper.
and a removable lid (upper lid) 5 that seals the water supply port of the main body.

Conventionally, when checking the amount of hot water remaining in the pot body 3, it was necessary to open the top lid 5 or check the amount remaining in the pot body 3.
A vertical pipe extending from inside the main body is installed on the outer wall,
The water level inside the pot was checked by checking the water level in this pipe.

However, with both methods, it is difficult to accurately check the water level inside the pot in a dark place.
Moreover, since the method is performed visually, it is difficult to check the water level at a location far from the pot body 3. Therefore, if it could not be confirmed that the water in the pot body 3 had run out, the pot body would continue to be heated and kept warm, and the pot body would be emptied and damaged.

(c) Purpose of the invention This invention was created in view of the above circumstances.
It is possible to check the water level inside the pot body even in a dark place, and also to know when the water in the pot body has run out even in a place far away from the pot body, thereby preventing the pot body from drying out. It is.

(d) Structure of the invention The structure of this invention is that the main body of the cylindrical heat insulating jar is equipped with a heater and heater operation control means.
A water level detection optical fiber consisting of a pair of light transmitting optical fibers and a light receiving fiber facing each other from above and below with a space in between detects the water level inside the main body, and a light emitting body that emits light to this fiber. When the water level in the pot body falls below the tip of the upward optical fiber, the light-receiving optical fiber corresponding to the upward optical fiber receives the light from the light emitter, and the light is activated in response to the light reception signal. A water level detection circuit comprising a conversion electronic element and a water level indicator lamp and/or a water supply buzzer operated by the element is attached, and the water level detection circuit is further provided with a water level detection circuit equipped with a conversion electronic element and a water level indicator lamp and/or a water supply buzzer operated by the photoconversion electronic element. This electric jar pot is equipped with a heater stop timer that stops the operation of the heater after a certain period of time has elapsed from the start.

(e) Examples This invention will be described in detail based on examples shown in the figures below. Note that this invention is not limited to this.

Figures 2 and 3 show the overall structure of the electric jar pot 6, in which 7 is a rectangular vertical jar pot body (pot body), with a water supply port 8 formed in the upper part, an outer cylinder 9, and this outer cylinder. It consists of a heat insulating inner cylinder 11 fixed with a fitting 10 inside, and a lid body (upper lid) 12 is removably attached to the water supply port to seal the water supply port 8. The outer cylinder 9 has a sprue 13 formed on the upper front side, a handle 14 on the opposite side of the sprue, and a body socket 15 and heating/warming lamps 16, 17 on the lower part of the outer cylinder.
are each installed. The entire outer wall of the inner cylinder 11 is covered with a heat insulating material 18, and a band heater 1 is wrapped around the outer wall surface of the lower part of the inner cylinder between the heat insulating material and the inner cylinder.
A temperature regulator (main thermostat) that controls the operation of this heater is wrapped around the inner wall of the cylinder.
20 (not shown in FIG. 3, see FIG. 4) is embedded.

Furthermore, inside the inner cylinder 11, three light transmitting optical fibers 21, 22, 23 of the same length and three light receiving optical fibers 2 extending vertically downward from inside the upper lid 12 are provided.
4, 25, and 26 are installed, and these light receiving fibers include a water supply level receiving optical fiber 24 that detects the water supply level near the bottom wall (water supply level), and an intermediate water level receiving optical fiber 24 that detects the intermediate water level above this fiber. It consists of an optical fiber 25 for detecting the upper water level, and an optical fiber 26 for receiving light at the upper water level to detect the upper water level above the water level. It is bent into a shape, with the tip pointing straight upwards. On the other hand, the optical fibers for transmitting light include an optical fiber 21 for transmitting water supply water level light, an optical fiber 22 for transmitting intermediate water level light, and an optical fiber 2 for transmitting upper water level light, which corresponds to each of the optical fibers 24, 25, and 26 for receiving light.
3, which are arranged in this order from the handle 14 side to the sprue 13 side, and the upper and lower ends of the corresponding light-receiving optical fibers and light-transmitting optical fibers face each other with a space in between. . Furthermore, each optical fiber for receiving light and each optical fiber for transmitting light is covered with an optical fiber cover pipe 27, and the water level inside thereof is formed to be the same as that of the inner cylinder 11, and the upper end thereof is connected to the bottom wall inside the upper lid. It is connected to a sensor board 28 that constitutes a sensor circuit for water level detection (see FIG. 5) fixed to the water level. Also, on the sprue 13 side of the upper surface of the upper lid 12, there are water supply water level (water amount) display lamps (water supply lamps) 29 that light up in response to signals from each pair of optical fibers.
, an intermediate water level (water amount) indicator lamp 30, and an upper water level (water amount) indicator lamp 31 are embedded. In addition, a water supply buzzer 32 that operates in response to the pair of water supply water level optical fibers 21 and 24 is connected to a heating/warming lamp 1 on the lower outer wall of the pot main body 7, as shown in FIG.
It is installed on the front side of 6 and 17.

Fig. 4 shows an electric circuit for heating the pot body 7, in which a heating band heater 19a and a main thermostat 20 are connected in series to an AC100V power supply circuit, and a heating band heater 19b for heating and keeping warm is connected in parallel to these. has been done. Note that 41 is a main switch for both band heaters.

FIG. 5 shows a sensor circuit for water level detection, on which a light emitting diode 33 for sending light to the light transmitting optical fibers 21 to 23 is installed, and in parallel with this diode, a conversion transistor circuit 34 for a water level display lamp and Photoconversion transistor 35 for water supply buzzer
are connected to each other. The water level display lamp transistors are three transistors 36 to 38 that operate corresponding to each of the light receiving optical fibers 24 to 26.
Each transistor is connected in series with the water supply lamp 29, the intermediate water level indicator lamp 30, and the upper water level indicator lamp 31, respectively, and the water supply buzzer transistor 35 is connected in series with the water supply buzzer 32. Further, a timer 39 is connected in parallel with the water supply buzzer to operate the heating band heater 19a and the heating band heater 19b.

The water level detection sensor circuit described above is connected to the heating electric circuit via a transformer 40, and the timer 39 is connected to turn off the main switch 41 of the heating electric circuit.

Next, a method of displaying the water level inside the pot body using the electric jar pot 6 having the above structure will be explained.

First, the pot body 7 is filled with water, and the band heater 19 is heated to raise and maintain the temperature of the water in the pot body. Then, the sensor circuit is energized to cause the light emitting diode 33 to emit light, and the light is transmitted to each of the light transmitting optical fibers 21 to 23. The water level (hot water surface) in the pot body 7 is the same as that of the light receiving optical fiber 24.
26, the light transmitted from each light transmitting optical fiber 21 to 23 is refracted at the boundary between the hot water surface and the space, and the light transmitted from each light receiving optical fiber 24 is refracted at the boundary between the hot water surface and the space.
No light was received between 26 and 26.

Next, when the water in the pot body 7 is drained outside the pot body 7 for use, the water level in the pot body 7 gradually decreases. When the water level falls below the tip of the upper water level light receiving optical fiber 26, this optical fiber receives the light transmitted from the corresponding light transmitting optical fiber 23, and transmits this light reception signal to the corresponding water level display transistor 38. send to The transistor then exchanges this optical signal into an electrical signal and lights up the upper water level indicator lamp 31. Similarly, when the water level in the pot body 7 falls below the tip of the optical fiber 25 for receiving the intermediate water level, the intermediate water level indicator lamp 30 lights up to notify the water level, and furthermore, the water level in the pot body 7 decreases to the optical fiber 24 for receiving the water supply water level.
When the water level falls below the tip, the water supply lamp 29 lights up and the light reception signal is also sent from the water supply water level receiving optical fiber 24 to the water supply buzzer transistor 35. This transistor then converts the optical signal into an electrical signal, which activates the water supply buzzer 32 to sound an alarm indicating that water is being supplied. Therefore, water is supplied into the jar pot main body 7 to prevent it from drying out. However, in the unlikely event that you do not notice the lighting of the water supply lamp 29 or the alarm sound of the water supply buzzer 32, the timer 39 will operate after a certain period of time and turn off the main switch 41 of the heating electric circuit. The operation of the band heater 19a and the band heater 19b for heating and keeping warm is stopped to prevent dry heating. When water is supplied into the jar pot body 7, the lower and upper ends of each of the light transmitting optical fibers 21 to 23 and the light receiving optical fibers 24 to 26 are submerged in water, and each light transmitting signal is transmitted to each of the light receiving optical fibers 24 to 2.
6, each of the water level display lamps 29 to 31 is lit to display the ditch water.

By configuring the electric jar pot 6 as described above, it is possible to check the water level inside the jar pot body even in a dark place or in a place far away from the jar pot body, thereby making it possible to know when water is being supplied.
Moreover, even if you do not notice the lighting of the water level indicator lamp or the warning sound of the water supply buzzer, it is possible to prevent the water from drying up. Furthermore, since the water level in the jar pot body is displayed using a water level indicator lamp, the water level indicator lamp can be installed at an easily visible position depending on the installation location of the jar pot body.

(f) Effects of the invention A water level detection optical fiber consisting of a pair of light transmitting optical fiber and light receiving optical fiber is provided inside the pot body, and a water level indicator lamp and/or water supply buzzer that operates in response to this fiber is provided. By providing a specific heater stop timer, it is possible to check the water level inside the jar pot body even in a dark place, and also to know when the water has run out in the jar pot body even in a place far away from the jar pot body. Therefore, it is possible to prevent the jar pot body from drying out, and even if the user does not notice that there is no water in the jar pot body, it is possible to prevent the jar pot body from drying out.

[Brief explanation of the drawing]

Fig. 1 is a vertical sectional view showing a conventional electric jar pot, Fig. 2 is a perspective view showing an embodiment of the electric jack pot body according to this invention, Fig. 3 is a view corresponding to Fig. 1, and Fig. 4 is a view of this device. Band heater electrical circuit diagram,
FIG. 5 is a circuit diagram of this sensor. 6...Electric jar pot, 7... Jar pot body, 12...Top lid, 18...Insulating material, 19...
Band heater, 20...Main thermostat,
21-23... Optical fiber for light transmission, 24-26
... Optical fiber for light reception, 29-31 ... Water level display lamp, 32 ... Water supply buzzer, 33 ... Light emitting diode, 34, 35 ... Photo conversion transistor,
39... Heater stop timer.

Claims (1)

[Scope of utility model registration request] A cylindrical heat-insulating jar pot body equipped with a heater and heater operation control means includes a pair of light-transmitting optical fibers and light-receiving fibers facing each other from above and below with a space in between, which detects the water level inside the body. It is equipped with an optical fiber for water level detection and a light emitter that emits light on this fiber, and when the water level inside the pot body falls below the tip of the upward optical fiber, the light receiving optical fiber corresponding to the upward optical fiber is activated. A water level detection circuit is attached, which includes a light conversion electronic element that receives light from the light emitting body and operates in response to the light reception signal, and a water level display lamp and/or water supply buzzer that is operated by this element. An electric water pot comprising a water level detection circuit equipped with a heater stop timer that is activated by the photoconversion electronic element and stops the operation of the heater after a certain period of time has elapsed from the start of the operation.