JPS60259229A - Pot having liquid temperature display function - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Technical fields> This invention relates to a pot.

<Prior art> In pots that can keep liquid warm, such as thermos flasks, hot water that has just been boiled in a kettle, etc. is poured into the inner container with the lid open, and then the lid is closed. In order to prevent the temperature from dropping, there has never been a function to display the water temperature to the outside, and furthermore, no attempt has been made to provide such a function. Rather than making such an attempt, we decided to obtain high heat retention performance by using a vacuum duplex as the inner container, or by covering the outer periphery of the metal inner container with a heat insulating material. A great deal of effort is being made.

However, even with such great efforts, there is a limit to the heat retention performance of the pot itself, and if the heat retention time is prolonged, the temperature of the hot water, which was close to 100 °C at the beginning of the heat retention, will drop to 60 °C to 70 °C.
The temperature will drop to about

This kind of temperature drop cannot be known at all just by looking at it from the outside, but can only be known by pouring it into a receiving container such as a pot, or by tasting it after pouring it. There is a problem that it is time-consuming because you have to perform the boiling process that you know how to do, and if the water temperature drops too much, the instant coffee etc. may not taste good. There is a problem in that the instant coffee etc. obtained by doing so is wasted.

<Purpose> The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a novel pot that can display the temperature of the liquid inside the inner container.

Structure> The pot of the present invention to achieve the above object is a pot having an inner container inside an outer case, a temperature sensor for detecting liquid temperature is provided in the inner container, and a predetermined temperature sensor of the outer case is provided. The device is characterized in that a display device is provided at the position to display the temperature detected by the temperature sensor.

<Example> Hereinafter, embodiments will be described in detail with reference to the accompanying drawings showing examples.

Figure 1 shows a cross section of the air box, where (1) is the outer case, (2) is a lid unit that can be opened and closed freely connected to the outer case (1) at the hinge part (3), and (4) is the outer case. (1
) is an inner container consisting of a double glass bottle housed in (5).
is a stopper that is inserted into and removed from the upper opening of the inner container (4).

Inside this stopper, there is a stainless steel pouring pipe (6) that hangs down on its lower surface, and a water injection pipe (force communication part (8)) that projects forward. A tipping water stop valve (9) is housed to prevent water leakage.

Also, inside this plug (5), there is an exhaust port (IO) of a bellows type air pump (10) housed in the lid unit (2).
') and the inside of the inner container (4) (12)
is formed.

A hook valve (11) is provided on the upper surface of this bellows type air pump (10), and this hook valve (11)
is urged upward by the force of the spring (14) and is in contact with the upper push plate (13), and when no external force is applied to the push plate (13), the inside of the bellows type air pump (10) and It communicates with the outside to extend the bellows type air pump (10) and push the push plate (13) upward.

Therefore, by pushing the push plate (13) in a known manner, the hook valve (11) is closed and the bellows type air pump (10) is compressed.
10) is supplied into the inner container (4) through the ventilation path (12), and due to this pressure, the liquid in the inner container (4) is discharged from the water injection pipe (the outlet of the sword) and the discharge vibrator (
15) The air pot of this embodiment is configured to be guided to the outside through the air port 15).

(16) is a liquid temperature indicator provided on the front surface of the water injection cover (17), and as shown in FIG. ) and a battery display section (32) that indicates whether the battery is normal. In addition, (18) is the hinge portion (
3) is a battery storage section formed on the lower side.

The circuit configuration of this display device consists of a temperature sensor (such as a thermistor) attached to the lower end of the dispensing vibrator (
Th) is used to detect the liquid temperature by measuring the resistance value, and the waterproof lead wire (19) that extends upward along the inner or outer surface of the spout pipe (6) Body (5
), and a part of this metal member (20) is connected to the display circuit side and comes into contact with a connecting piece (22) provided at the opening of the inner container. is configured to do so.

Next, the display device will be explained based on FIG. 2 and subsequent figures.

(23) is an oscillation circuit for generating clock pulses consisting of a crystal oscillator, a ceramic oscillator, etc., and (24) is a synchronous pulse generation circuit that generates pulses such as driving pulses for liquid crystal display and charging pulses from clock pulses. 70
It is composed of whelks.

(25) and (26) are both analog switches that close when the signal voltage is at a high level, and (27) is a clock input terminal (C
A counter that counts by 1" each time a high level signal voltage is input to L). When a high level signal voltage is input to the gate terminal (G), (28) takes in the input signal voltage of the data terminal and outputs it. A latch circuit that maintains (2
9) is a comparator composed of an operational amplifier, (30)
is RS flip 70 knob, (33) is counter (27)
(G2o) is a gate that is opened and closed by an RS flip-flop (30). Note that these circuits are preferably constructed of eight C-MO elements in order to save power consumption.

Next, the operation of this circuit will be explained.

The liquid level detection using this circuit repeats the same operation, but the temperature sensor (Th) and the capacitor connected in parallel) l-(C
The explanation will begin from a state in which no charge is stored in X). In this state, a reset signal as shown in FIG. 3(A) is output from the synchronizing pulse generating circuit (24). This reset signal is applied to the reset terminal (R) of the flip 70 tube circuit (30) and the reset terminal (R) of the counter (27).
) and reset both.

That is, the output of each bit of the counter (27) is all initialized by this signal and becomes a low level output, and
As shown in Figure 3 (C), the flip 70 knob (30
) output terminal (Q) outputs a low level signal, turns off the analog switch (26), and connects the capacitor (
Cx ) is disconnected from the shorted state to the non-shorted state.

Furthermore, when a high-level signal is output from the other output terminal (Q), gate 1- (G2o) is open, and the charging pulse signal generated by the synchronization pulse generation circuit (24) is connected to the output line. generates the same voltage as

The synchronizing pulse generating circuit (24) sends a charging pulse onto the charging pulse signal line following the reset signal as shown in FIG. 3(b). This charging pulse is input to an analog switch (25) and a gate (G2o), and each time a charging pulse occurs, the analog switch (25) closes and the capacitor (Cx) goes to a high potential through the resistor (R2). The capacitor (Cx) is connected and charged little by little, and the voltage between the terminals of the capacitor (Cx) gradually increases. By repeating charging, when the voltage between the terminals of the capacitor (CX) reaches the reference voltage (Vs) determined by the resistor (R1) and the temperature sensor (Th), the comparator (29)
outputs a high level signal and flips 70 tubes (30
). Therefore, as shown in Figure 3 (c),
A low level signal is output from the output terminal (100) of this flip 7L1 knob (30), closes the gate (G2o), blocks the charging pulse from passing through this gate (G2o), and covers the output terminal (Q ) turns on the analog switch (26) to discharge the charge stored in the densifier (Cx).

In this way, the charging pulse from the start of charging the capacitor (Cx) until the voltage across the terminals of the capacitor (Ox) reaches the reference voltage (VS) passes through the gate (G2o) and is input to the counter (27). The number of charging times is counted by (27).

In addition, when the first operation is performed, the synchronization pulse generation circuit (24) inputs the first measurement pulse and the second measurement pulse to the comparison circuit (31), and receives the pulses from the comparison circuit (31). 31) compares the contents of the counter (27) and the contents of the latch circuit (28), and when they become equal, inputs a high-level signal to the gate terminal of the latch circuit (28), and ) is stopped, the counter (27) passes through the latch circuit (28).
) is output to the display (16) side. That is, as the temperature of the liquid in the inner container (4) increases, the resistance value of the temperature sensor (Th) increases, the reference voltage (Vs) rises, and the capacitor (
The number of times of charging required to charge until the voltage between the terminals of Cx) reaches the reference voltage (Vs) increases, and the liquid temperature is measured by the number of times of charging.

Also, when the power supply voltage decreases, the voltage applied to the capacitor (Cx) decreases, but the resistor (R1) and temperature sensor (Th
) The reference voltage (Vs
) also decreases in proportion to the power supply voltage, so the capacitor (Cx)
The number of pulses required for charging does not change, therefore, accurate liquid temperature detection is possible by counting the number of pulses.

In addition, as the liquid temperature increases, the latch circuit (28) changes from the first stage output line corresponding to the first stage of the lowest stage of the liquid temperature display section (31) of the display (16) to the first stage of the liquid temperature display section (31) of the display device (16). High level signals are gradually output to many output lines up to the fourth stage output line corresponding to the fourth stage. For example, when the liquid temperature is close to room temperature, a low level signal is output to all output lines, and when the liquid temperature is close to the boiling point, a high level signal is output to all output lines, and furthermore, a display proportional to the liquid temperature is displayed. The width of the charging pulse and the number of digits of the counter (27) are set so that

Further, the display device (16) is a display device using liquid crystal,
Only the cement to which a potential different from the potential input to the common terminal is applied lights up, but in order to protect the liquid crystal, the common terminal is connected to the periodic pulse generator circuit (24) generated by the periodic pulse generating circuit (24). A liquid crystal driving pulse of several tens of hertz is input as shown.

Therefore, a segment to which a pulse whose phase is inverted as shown in FIG. 3(b) is input is lit up, and a segment to which a pulse having the same phase as the liquid crystal driving pulse as shown in FIG. 2(a) is applied is not lit up.

Figure 5 is an electrical circuit diagram of a pot equipped with not only a liquid temperature display function but also a liquid volume display function.The difference from the above embodiment is that the dispensing vibrator (6) itself is made of a conductive material such as stainless steel. In addition, a tape (39) made of a conductive material such as aluminum is attached to the outer periphery of the inner container (4) to form a capacitor (Cy) whose capacitance changes depending on the amount of liquid. The display device (16) includes a liquid crystal for displaying liquid temperature and a liquid crystal for displaying liquid quantity, and a latch circuit (34) and comparison circuit (35) for displaying liquid quantity. A selector (3) that selectively performs liquid temperature display operation and liquid volume display operation.
6) (37) (38) are provided.

Therefore, when the liquid temperature display operation is selected by the select pulse output from the synchronous pulse generation circuit (24), the capacitor (Cy) does not operate, and the output of the counter (27) is used for liquid temperature display. Since the signal is input only to the latch circuit (28) and comparison circuit (33), the liquid temperature can be detected and displayed in the same manner as in the above embodiment.

On the other hand, when the liquid level display operation is selected, the capacitor (Cy) operates instead of the capacitor (Cx), and the reference voltage (Vs) is controlled by the fixed resistor (R3) instead of the temperature sensor (Th). Furthermore, the output of the counter (27) is sent to a latch circuit (34) for liquid volume display and a comparison circuit (3).
5), the reference voltage (Vs) remains constant and the capacitance of the capacitor (Cy) changes in accordance with the amount of liquid inside the inner container (4). Then, if the capacitance of the capacitor (Cy) changes, the capacitor (Cy) changes.
Since the required number of charging pulses until the voltage between the terminals of Cy) reaches the reference voltage (Vs) will change,
By counting this required number of charging pulses and inputting it to the display (16) through the latch circuit (34) for liquid volume display, the liquid volume is displayed in several stages (7 stages in the case of the figure). be able to.

In this embodiment, since the liquid temperature display and the liquid volume display are repeated alternately, the user can be easily notified of the liquid temperature and the liquid volume, making it even more convenient to use.

It should be noted that the present invention is not limited to the above embodiments, and for example, a negative characteristic thermistor may be used as a temperature sensor,
In addition to being able to display whether the temperature is higher or lower than the resistance sudden change temperature of the negative characteristic thermistor, various design changes can be made within the scope of the invention.

<Effects> As described above, this invention enables the temperature of the liquid inside the inner container to be detected and displayed on the outside, making it possible to easily know the temperature of the liquid without pouring hot water into the liquid receiving container. This prevents the inconvenience of accidentally pouring lukewarm water when making instant coffee, tea, etc., or the inconvenience of accidentally pouring hot water when making Gyokuro tea. It has the unique effect of being able to prevent

[Brief explanation of drawings]

Figure 1 is a vertical cross-sectional view of the pot, Figure 2 is an electrical circuit diagram of the same as above,
3 and 4 are pulse time charts, and FIG. 5 is an electric circuit diagram showing another embodiment. (1)...Outer case, (4)...Inner container, (6)
... Output pipe, (16) ... Indicator, (Th)
...Temperature sensor.

Claims (1)

[Claims] 1. A pot having an inner container inside an outer case,
In addition to installing a temperature sensor to detect liquid temperature inside the inner container,
1. A pot having a liquid temperature display function, characterized in that an indicator for displaying the temperature detected by a temperature sensor is provided at a predetermined position of the exterior case. 2. A pot having a liquid temperature display function according to claim 1, wherein a temperature sensor is attached to the pouring pipe. 3. A pot having a liquid temperature display function according to claim 1, wherein the pot also has a liquid volume display function.