JPH09192003A - Operating temperature measuring device for thermal reaction device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable to accurately measure operating temperature of an operation mechanism member by providing a thermal reaction device composed of a cylindrical case which has a top surface to contact with a heated part and which opens downward, a thermal element arranged on the top surface of the cylindrical case, and an operation mechanism member which operates according to the change of the state of the thermal element, when the temperature of the heated part becomes a set temperature. SOLUTION: The title device is composed of a heating cylinder 6a which covers a cylindrical case 20 and opens downward, a heater 62 built in the heating cylinder 6a, a temperature detector 70 for measuring temperature of a top surface of the cylindrical case 20, and an operation detector device 63 for detecting operation of an operating mechanism member, and also provided with an output device 80 which outputs detected temperature of the temperature detector 70 as an indicated state or a recorded state, when an operation detector signal is input from the operation detector device 63.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat-sensitive device including a heat-sensitive element that detects the temperature of a heated portion such as a rice cooker or a cooking pot, and an operating mechanism that operates when the heat-sensitive element reaches a set temperature. It relates to a method for measuring an operating temperature and a device for implementing this method.

[0002]

2. Description of the Related Art The heat sensitive device is used in a rice cooker as shown in FIG. In this case, the bottom of the rice cooker (10)
The top surface portion (29) of the tubular case (20) is in contact with (11),
On the top surface portion (29) of the tubular case (20), a temperature sensitive soft ferrite whose magnetic permeability changes with temperature is additionally provided as a heat sensitive element (21). The lower surface of the heat-sensitive element (21) is covered with a cover made of a non-magnetic material, and the lower surface of the cover is attracted by an adsorbent (39) made of a permanent magnet. It is fixed to the upper end of a lifting shaft (30) connected to the tip of a swing lever (41) described later. Further, arms (32) (32) extending horizontally are projected on both sides of the adsorbent (39), and through holes (320) (3) formed in the arms (32) (32).
The guide shafts (35) and (35) with the 20) built into the cylindrical case (20) are inserted. As a result, the posture of the lifting shaft (30) is properly maintained. Further, the lower end of the elevating shaft (30) is connected to a tip end portion of a swing lever (41) which is connected to the rice cooking operation lever (40).

Further, the rice cooker body is provided with a valve device for opening and closing the gas circuit to the gas burner (50), and the gas valve (51) of this valve device is linked with the rice cooking operation lever (40). Further, the valve shaft (53) of the gas valve (51) is provided with a swing lever (41).
Is in contact with an upright portion (45) formed by bending one end of the upside. In this case, when the rice cooking operation lever (40) is pushed down, the gas valve (51) is opened against the urging force of the spring (52) to supply the gas to the gas burner (5), whereby the gas burner (5) is supplied. (5) begins to burn. In addition, the above rice cooking operation lever
The swing lever (41) swings upward by the operation of (40) to lift the lifting shaft (30), and the suction member arranged at the upper end of the lifting shaft (30).
(39) is adsorbed on the heat sensitive element (21), and the rice cooking operation proceeds in this state.

When the cook bottom is heated to the rice cook completion temperature (usually 145 ° C.) in the rice cooked state, the magnetic permeability of the heat sensitive element (21) in a heat conducting state is lowered, The attracting force of the adsorbent (39) to the heat sensitive element (21) becomes weak, and this falls with the lifting shaft (30). Then, the lifting shaft (3
The swing lever (41) connected to the lower end of (0) also swings back to the initial position, and in conjunction with this, the gas valve (51) is pushed out by the urging force of the spring (52) to close the valve. . Thereby, the rice cooking operation is completed.

In this rice cooker, the heat sensitive element (21), the adsorbent (39), a cylindrical case (20) for accommodating them, the adsorbent
The combination of the lifting shaft (30) with the (39) attached functions as a thermosensitive device. The operating temperature of the heat-sensitive device is set to the above-mentioned rice-cooking completion temperature. Whether or not the operating temperature is accurate directly affects rice-cooking performance. This operating temperature is determined by the operating temperature of the above-mentioned heat sensitive element (21) (the temperature at which the magnetic permeability changes rapidly) and the operating characteristics of the operating mechanism section that interlocks with this.

Therefore, in order to accurately know the operating temperature of the heat-sensitive device, it is necessary to confirm the operation in the state where the operating mechanism parts are combined and to know the temperature at that time. However, conventionally, the operating temperature of the thermosensitive element (21) itself is merely measured.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and is "a cylindrical case having a top surface portion which comes into contact with a heated portion and which is open downward, and the inside of the cylindrical case. Of the above, a heat-sensitive device including a heat-sensitive element attached to the top surface portion, and an operating mechanism section that operates according to a change in the state of the heat-sensitive element when the temperature of the heated portion reaches a set temperature.
It is an object of the present invention to make it possible to accurately measure the operating temperature when the operating mechanism section operates.

[0008]

The technical means of the invention according to claim 1 for solving the above-mentioned problems is "a heating cylinder which encloses the cylindrical case and opens downward, and a heater incorporated in this heating cylinder. And a temperature detection device that measures the temperature of the top surface of the cylindrical case, and an operation detection unit that detects the operation of the operation mechanism unit. When an operation detection signal from the operation detection unit is input, An output device for outputting the detected temperature of the temperature detecting device to the display state or the recording state is provided ”.

In this structure, the heat-sensitive element is heated by the heater incorporated in the heating cylinder, and when the heat-sensitive element rises to its operating temperature, the operating mechanism section operates. This operation is detected by the operation detecting means, while the temperature at this time is detected by the temperature detecting device, and this temperature is displayed or recorded on the output device. That is, the temperature of the top surface portion when the operating mechanism portion is operated is accurately detected.

When the top surface portion is built into a device as a heat-sensitive device, it contacts the heated portion, so that the detected temperature matches the temperature of the heated portion. As the heat sensitive element, a disk bimetal, a low melting point alloy that changes from solid to liquid at a set temperature, a thermistor, and further, the magnetic permeability rapidly changes at the set temperature as defined in claim 3. A so-called temperature-sensitive soft ferrite or the like may be adopted. Further, as the temperature detecting device, a so-called thermocouple type temperature detecting device which measures a current generated in the thermocouple and converts the current into a temperature can be adopted as in the fourth aspect. In this case, the heating cylinder is provided with a heat receiving plate that is in contact with the top surface portion of the cylindrical case, and the temperature detecting device has one end of the thermocouple connected to the temperature detecting device,
This is the hot junction for the thermocouple circuit.

[0011]

The invention of claim 1 has the following unique effects. The operating temperature when the operating mechanism of the heat-sensitive device operates
It can be accurately detected without operating the heating source of the rice cooker. Further, since there is no need to perform any processing on the heat sensitive device, it can be conveniently used for sampling inspection in the rice cooker assembly line.

According to the invention of claim 5, the heating cylinder is capped on the upper end of the cylindrical case protruding from the upper surface of the lower frame of the rice cooker, and the operation detecting means is fitted in the central opening of the lower surface of the lower frame. Since the operating temperature can be measured just by wearing it, preparation work for temperature measurement can be simplified.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the embodiments of the present invention described above will be explained. In the example shown in FIG. 2, the device is a device for measuring the operating temperature of the heat-responsive device provided in the central hole of the gas burner (50) of the rice cooker. The structure inside the cylindrical case (20), that is, the lifting shaft (30) and the connecting structure between the lifting shaft (30) and the swing lever (41) are configured in the same manner as the structure of the rice cooker described above. The same parts are denoted by the same reference numerals.

In the rice cooker of this example, the central opening of the soup saucer (12) which constitutes the upper surface of the lower frame portion incorporating the automatic fire extinguishing mechanism and the like.
The gas burner (50) and the cylindrical case (20) project upward from the (13). Although not shown, the lower frame part is a rice cooker in which an upper frame part accommodating a rice cooker is detachably mounted, and this structure is well known.

In the lower frame portion of the rice cooker of this type, in order to make it possible to check the mechanical portion inside the tubular case (20) of the heat-sensitive device at the center of the bottom surface of the lower frame case (14). Opening (15)
Are formed. As shown in the same figure, the device for measuring the operating temperature of the heat-sensitive device is such that the soup saucer (12) is covered with a cylindrical case (20) protruding from the soup saucer (12).
The heating cylinder (6a) that is open downward and is placed on the opening (15).
An operation detector (6b) attached to the heat-receiving plate (61) that is connected to the top wall of the heating cylinder (6a) and is in contact with the top surface portion (29) of the tubular case (20); Temperature detecting device (70) for detecting the temperature of the plate (61), the temperature detecting device (70) and operation detecting tool (6b)
AND circuit (71) to which the output from is input and this AND
And an output device (80) for displaying the output of the circuit (71).

Further, the heating element (2a) is attached to the heating cylinder (6a).
While the heater (62) is built in so as to be located on the outer periphery of 1), one contact part of the thermocouple (72) of the temperature detecting device (70) is connected to the heat receiving plate (61). There is. The temperature detection device (70) is a device that measures a current value based on thermoelectromotive force generated in the thermocouple (72) and converts it into a temperature signal, and this temperature signal is input to the AND circuit (71). Has been done.

The output device (80) is provided with a display means such as a liquid crystal display screen and the temperature is displayed on the display means. The operation detecting tool (6b) is composed of an operation detecting means (63) such as a proximity switch for detecting the descending movement of the elevating shaft (30), and a rubber cover (64) wrapping the outer periphery and the lower side thereof. (64)
The outer diameter of is set to a size that allows it to be detachably fitted in the opening (15), and when fitted in the opening (15), the operation detecting means (63) causes the lifting shaft ( Opposite the lower end of 30).

The operation detecting means (63) is a rice cooking operation lever.
By operating (40), the lifting shaft (30) connected to the tip of the rocking lever (41) is lifted, and the permanent magnet (adsorbent (39)) attached to the upper end of the lifting shaft (30) is attached to the thermosensitive element (21). When it is adsorbed, the lifting shaft (30) separates upward, so that it is turned "off", and conversely, when the heat-responsive device operates and the lifting shaft (30) is lowered, it is turned "on". The output signal from the operation detecting means (63) is input to the AND circuit (71).

In order to measure the operating temperature of the rice cooker having the above structure using this operating temperature measuring device, the operation detecting tool (6b) is attached to the opening (15) as shown in FIG. And soup saucer (1
Place the heating cylinder (6a) on 2). At this time, this heating cylinder (6a)
The cylindrical case (20) is positioned so as to be housed in the space portion that opens downward in. The depth of this space and the height of the heat receiving plate (61) incorporated therein are determined by the degree of protrusion of the tubular case (20), particularly when the upper frame is placed on the lower frame. The top surface (29) of the tubular case (20) is adapted to the protruding height in a state of being pressed against the bottom of the rice cooker, and in the above-mentioned installed state, the top surface (29) and the heat receiving plate (61). ), And the height of the top surface portion (29) at this time matches the height of the center of the bottom surface of the rice cooker with the upper frame portion placed on the lower frame portion.

In the rice cooker, in order to prevent empty heating, the upper frame part accommodating the rice cooker is usually placed on the rice cooker, and the lifting shaft (30) is operated by operating the rice cooker operation lever (40). Is adhered to the cover (31) on the lower surface of the heat sensitive element (21). Therefore, the adsorption body (39) can be set in the adsorption state with the heating cylinder (6a) placed. Therefore, when the rice cooker operation lever (40) is pushed in with the operation detector (6b) placed on the soup saucer (12) as described above, the adsorbent (3
9) is attracted to the heat sensitive element (21), and the lifting shaft (30) is held in the raised position.

When the heater (62) is energized in this state, the heater (62) heats the thermosensitive element (21). The temperature of the heat sensitive element (21) matches the temperature of the top surface portion (29) and the heat receiving plate (61) in contact therewith, and the temperature of the heat receiving plate (61) is measured by the temperature detecting device (70), The temperature signal is input to the AND circuit (71). Then, when the temperature of the heat sensitive element (21) reaches the set temperature, the magnetic permeability of the heat sensitive element (21) sharply decreases, and the adsorbent (39) and the lifting shaft (30) descend. This descent time is detected by the operation detection means (63), and the output at that time is AN
The temperature signal at this time is input to the D circuit (71) and the output device
It will be output to (80).

As described above, the heating cylinder (6a) and the operation detector (6
If the heater (62) is heated by attaching b) and, the operating temperature of the heat responsive device can be accurately and automatically measured. In addition, in the above-mentioned example, the tubular case (2
0) is biased in the upward direction by a spring in order to improve the adhesion with the rice cooker. Therefore, the weight of the heating cylinder (6a) is set so that it can push down the cylindrical case (20) against the biasing force of the spring.

Further, in order to prevent heat from the heater (62) from escaping to the outside, the outer peripheral portion of the heater (62) is surrounded by a heat insulating material (65). Other Embodiments As a heat-sensitive reaction device in which the heat-sensitive element (21) is so-called temperature-sensitive soft ferrite, two heat-sensitive elements (21
1) (212) is provided, and as a structure in which the adsorbents (39) are adsorbed individually, there is a heat sensitive device of a type in which each adsorbent (39) is operated individually at each of the set temperatures. This heat sensitive device is used in a so-called two-stage fire extinguisher rice cooker. As a device for measuring each operating temperature of the heat sensitive device,
The structure shown in FIGS. 3 and 4 can be adopted.

In this case, as shown in FIG.
A first heater (621) having a large amount of heat generation and a second heater (622) having a smaller amount of heat generation are built in (6a).
Further, in order to realize the above-mentioned two-stage fire extinguishing, the first heat sensitive element (211) for setting the first operating temperature is provided on the lower surface of the top surface portion (29) of the cylindrical case (20), and the final second operating state. A second thermosensitive element (212) for setting the temperature is attached in an attached state, and a first permanent magnet as a first adsorbing body (391) is associated with the first thermosensitive element (211), Second permanent magnets are provided as second adsorbents (392) corresponding to the second heat-sensitive elements (212) of the above, and each of the adsorbents (391) (392) has a lifting shaft (301) (30).
2) are connected in series and are individually connected to the tip ends of the swing levers (411) (412). The rocking levers (411) and (412) are configured such that the tips thereof are simultaneously lifted upward by the rice cooking operation part, and are set at the respective set temperatures of the first and second heat sensitive elements (211) and (212). According to the separation and fall of the adsorbents, the valve elements inserted in the gas circuit to the gas burner (50) (not shown) are individually closed to adjust the heating power.

The first sensor (631) is provided in the opening (15).
And an operation detecting tool (6b) including a second sensor (632) are mounted, the first sensor (631) is located below the lifting shaft (301), and the second sensor (632) is located at the lifting shaft (302). ) Below. The first sensor (631) and the second sensor (63
2) is the first sensor when the corresponding lifting shaft is lowered
(631) and the second sensor (632) are turned on separately,
The first sensor (631) when the lifting shaft is in the raised position
And the second sensor (632) are individually turned off.

The first sensor (631) and the second sensor
Both (632) and the rubber cover (64) are mounted on the rubber cover (64) in an exposed state, and the rubber cover (64) is press-fitted into the opening (15) in a removable manner. The heating cylinder (6a) is formed with a cylindrical space that opens downward, and the size of this space is set to a diameter that allows the upper end of the cylindrical case (20) to be loosely fitted. The heat receiving plate (61) is suspended from the top wall (65) of the void by a pair of suspending rods so as to be vertically movable within a certain range. A spring (66) for pushing down the heat receiving plate (61) is interposed between the top wall (65) and the heat receiving plate (61). Therefore, in the free state, the heat receiving plate (61) is at the most lowered position in a state of being locked to the head of the hanging rod.

A thermocouple (72) having a hot junction connected to the heat receiving plate (61) is connected to a temperature detecting device (70), and a control device (C) composed of a microcomputer is connected to the temperature detecting device (70). Output is input. The first heater (621) and the second heater (622) are also controlled by the controller (C), and the first sensor (631)
The output from the sensor (632) is input to the control device (C).

The heating cylinder (6a) and the operation detecting tool (6b) are mounted on the lower frame portion of the rice cooker as shown in FIG. 3, as in the embodiment shown in FIG. At this time, the heating cylinder (6a) is capped in such a manner that the heating cylinder (6a) is externally fitted to the cylindrical case (20) projecting from the lower frame part, and the heating case (6a) is in a raised position with the top surface part (29) of the cylindrical case (20). The heat receiving plate (61) and the heat receiving plate (61) are in close contact with each other by the biasing force of the spring (66) and the biasing force of the spring for lifting the tubular case (20). The biasing force of the spring (66) is set to be weaker than that of the latter spring.

In this state, the respective operating temperatures are measured, the operation for this measurement is controlled by the control device (C) described above, and the control operation for executing the flowchart shown in FIG. 5 is performed. The operation of each unit will be described below based on the flowchart of FIG. In this example, the output from the control device is output to the printer (81) as shown in FIG.

When the power supply is connected to the control device (C), the heating cylinder (6
Electricity is also supplied to the first heater (621) and the second heater (622) in a) according to the control operation, and also to the printer (81). When the control operation is started, it is checked whether the first sensor (631) and the second sensor (632) are in the "off" state before the measurement operation is started. (Step (ST91, 92)) If the rice is cooked, the first sensor (631), the second sensor
Since the lifting shafts (301) (302) corresponding to (632) are separated from each other upward, the above is the first sensor (631) and the second sensor (632).
Are "off" separately.

When this is checked, it is determined whether or not a measurement start operation has been performed, and the control operation is on standby until this operation is executed. (Step (ST93)) In this example, the measurement start operation is performed by operating the measurement start button (not shown). When this operation is performed, the first and second heaters (621) (622) become conductive, and the temperature of the heat receiving plate (61) corresponding to the temperature of the heat sensitive element is heated by the temperature detecting device (70). The detected temperature is 110 ° C. (a constant temperature (for example, 10
C.) low temperature) is reached. (Step (ST94)) When heated to this temperature, the power supply to the first heater (621) is stopped (Step (ST95)), and after that, the second heater (6)
22) causes heating to proceed.

When the temperature of the first thermosensitive element (211) reaches the set temperature, the adsorbent (391) separates and descends so that the lower end of the lifting shaft (301) approaches the first sensor (631), which turns on. Become.
(Step (ST96)) As a result, the first operating temperature is measured and stored. After that, when the heating further progresses, the temperature finally reaches the set temperature of the second thermosensitive element (212). In this state, the other adsorbent
(392) separates from the second heat sensitive element (212) and moves up and down (302)
Falls, its lower end approaches the second sensor (632), and the second sensor (632) turns on. (Step (ST97)) As a result, the first operating temperature is measured and stored.

Thereafter, the stored value is output to the printer (81) and the first and second operating temperatures are printed out. In this case, two kinds of operating temperatures of the heat-sensitive responder of the rice cooker having a so-called two-stage fire extinguishing mechanism can be measured at once by operating the rice cooking operation lever (40) and the operation for starting the measurement.

If the measured value is within a certain range,
Since the performance of the thermosensitive device is satisfactory, when the stored value is within the certain range, the step for determining as "pass", and at this time, the printer (81) "pass" It is also possible to perform printing corresponding to.
Further, the above example exemplifies the case where the present invention is carried out to measure the operating temperature of the heat sensitive device of the rice cooker, but it is not limited to cooking pots or the like having other heating means such as electric heaters for cooking. The present invention can also be implemented for measuring the operating temperature of a heat sensitive device or the like.

When the temperature detecting device is a thermocouple type, in order to improve the temperature detecting accuracy, the heat receiving plate (61) to which the thermocouple is connected has a top surface portion (29) provided with a heat sensitive element (21). ) And the same temperature as
It is desirable that the peripheral portion of (61) be suspended in a space of a heating cylinder (6a) containing a heater (62) in a loosely fitted state. This is because the heat from the heater (62) does not directly affect the heat receiving plate (61).

Further, "The heating area of the heater (62) is set to the heat sensitive element (2
In the case of "1) configuration below the outer peripheral area",
The heat from the heater (62) does not directly affect the heat receiving plate (61).

[Brief description of the drawings]

FIG. 1 is an explanatory view of a conventional example.

FIG. 2 is an explanatory diagram of an embodiment of the present invention.

FIG. 3 is an overall explanatory diagram of another embodiment.

FIG. 4 is a detailed view of the relationship between the heating cylinder (6a), the operation mechanism section and the operation detection tool (6b) according to the embodiment of FIG.

FIG. 5 is a flowchart of the control device (C) of the above embodiment.

[Explanation of symbols]

 (29) ・ ・ ・ Top part (20) ・ ・ ・ Cylindrical case (21) ・ ・ ・ Heat sensitive element (6a) ・ ・ ・ Heating cylinder (70) ・ ・ ・ Temperature detector (63) ・ ・ ・ Activity detection means

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Akira Yasui 4-1-2 Hirano-cho, Chuo-ku, Osaka City Osaka Gas Co., Ltd. (72) Kozo Tamura 4-1-2 1-2 Hirano-cho, Chuo-ku, Osaka Within Osaka Gas Co., Ltd.

Claims (5)

[Claims] 1. A tubular case having a top surface portion in contact with a heated portion and opened downward, a heat sensitive element attached to the top surface portion in the tubular case, and a temperature of the heated portion is a set temperature. A device for measuring an operating temperature of the operating mechanism portion in a heat-sensitive responding device comprising an operating mechanism portion that operates according to a change in the state of the heat-sensitive element when A heating cylinder to be opened; a heater incorporated in the heating cylinder; a temperature detection device for measuring the temperature of the top surface of the cylindrical case; and an operation detection means for detecting the operation of the operation mechanism section. An operating temperature measuring device for a heat-sensitive responsive device, comprising an output device for outputting the detected temperature of the temperature detecting device to a display state or a recording state when an operation detecting signal from an operation detecting means is input. 2. The thermosensitive device has a structure in which a cylindrical case is in contact with a bottom portion of a rice cooker, and an operating mechanism is configured to raise and lower an elevating shaft in conjunction with a rice cooking operation lever. A raising / lowering shaft is lifted to a raised position by a rice cooking operation by a lever to be a rice cooker in a heat-responsive device, and the raising / lowering shaft is moved from a raised position depending on a change in a state of a heat-sensitive element. 2. The operating temperature measuring device for a heat sensitive device according to claim 1, wherein the operating temperature measuring device is configured to perform a descending operation, and the operation detecting means is configured to detect that the elevating shaft is descending. 3. The thermosensitive element is configured so that its magnetic permeability changes abruptly at a set temperature, and a permanent magnet attracting the thermosensitive element is provided at the upper end of the lifting shaft of the operating mechanism section. Item 3. An operating temperature measuring device for a heat-sensitive device according to Item 2. 4. The temperature detecting device is a thermocouple type temperature detecting device, wherein the heating cylinder is provided with a heat receiving plate which is in contact with the top surface portion of the cylindrical case, and the heat receiving plate is provided with a heat receiving plate of the temperature detecting device. 4. The thermocouple according to claim 1, wherein one end of the thermocouple is connected.
An operating temperature measuring device for a heat sensitive device according to any one of 1 to 3 above. 5. The tubular case projects from the upper surface of the lower frame portion of the rice cooker, and the bottom plate of the lower frame portion is provided below the lifting shaft of the operation mechanism portion housed in the tubular case. An opening is formed, the heating cylinder is detachably capped on the upper end of the tubular case, and the operation detecting means is detachably fitted in the opening. Item 5. An operating temperature measuring device for a heat-responsive device according to any one of items 2 to 4.