JPH0629664B2 - Automatic temperature controller for gas combustor - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an automatic temperature control device for a heated object of a gas combustor using a gas such as liquefied petroleum gas or city gas as a fuel.

<Prior Art> Conventionally, gas appliances that use electricity can control temperature relatively to capacity by using solenoid valves, thermistors, etc., but control of temperature of gas appliances that do not use electricity is
It is a method of using a bimetal to close a gas valve when it reaches a set temperature (for example, a gas rice cooker), and is used like a safety device, and there was no automatic temperature control device.

In general, the temperature control (heat power adjustment) of the object to be heated is manually performed by the operation knob of the gas appliance, the heat power adjustment knob, or the like. For example, in the case of a gas stove for cooking, the strength of the heating power, the temperature of the object to be heated, the cooking time, etc. were set according to the experience and feeling of the user. It had to be adjusted, and the finish of cooking was unstable. Also, equipment that requires automatic temperature control, such as an oven, was not functioning without a power supply.

<Problems to be solved> In a gas combustor, an object is to obtain an automatic temperature control device capable of setting an object to be heated to a desired temperature.

<Means for Solving Problems> In view of the above, the temperature of the object to be heated is detected by the heat sensitive element,
An object of the present invention is to provide an automatic temperature control device capable of transmitting the movement of the action point of the heat sensitive element to the valve and automatically controlling the gas flow rate so that the temperature of the object to be heated reaches a desired value.

In the figure, the present invention comprises a temperature detection unit, a temperature setting unit, and a gas flow rate control unit, and the temperature detection unit is provided with an action point for detecting the temperature of an object to be heated and outputting in a movement matching the detected temperature. It is equipped with a temperature detector to which a heat sensitive element (for example, bimetal) is applied.

The temperature setting unit has, for example, a communication unit that transmits a change in the position of the action point of the heat sensitive element to the gas flow rate control unit, and the communication unit has a temperature setting shaft that is rotatable or vertically movable. It is connected to the. One end of the connecting means is in contact with the point of action, and the other end of the connecting means is connected so that its movement can be transmitted to the valve of the gas flow rate control unit.

The gas flow rate control unit has a control main body, is provided with a gas inlet and a gas outlet, and is internally divided into a primary chamber (inlet side) and a primary chamber (outlet side) by a partition plate. A valve that operates like a seesaw is provided in the gas passage, and a through-hole is provided in the partition plate so that the gas flowing into the primary chamber can flow to the secondary chamber. A valve is provided so as to face the through hole, and the gas flow rate is controlled by the size of the distance between the through hole and the valve. One end of the valve penetrates the control body, and the penetrating portion is configured to be airtight and slidable by a packing.

In addition, the packing of the penetrating part is a diaphragm type packing to reduce sliding resistance.

<Operation> The movement of the operating point of the temperature sensing element of the temperature detection unit is expanded by the valve body of the gas control unit and transmitted to the valve, and according to the detected temperature,
In addition, by controlling the gas flow rate with a fast response speed to the movement of the operating point, and changing the operating point of the temperature sensitive element and the valve position to set the temperature by the temperature setting knob of the temperature setting unit, the temperature setting value can be set. Automatic temperature control to keep.

<Example> Hereinafter, an example will be described with reference to the drawings.

First, the first embodiment shown in FIG. 1 will be described. This embodiment is an example in which it is incorporated in a gas hot plate having a liquefied petroleum gas container in the body.

The combustor of the present example includes a plate 20 to be heated above the burner 18, and one end of the temperature detector 1 of the temperature detecting unit of the present device is provided so that the temperature of the plate 20 can be detected. At the other end of the temperature detector 1, there is an action point 2, which is in contact with one end of the connecting means 3. The action point 2 is designed to change in the A direction when the detected temperature rises and in the B direction when the detected temperature falls. A fulcrum 4 is provided at the center of the connecting means 3, and the connecting means 3 is rotatably provided in the C and D directions. A temperature setting shaft 5 is connected to the fulcrum 4 and is provided with a male screw 5a. Above the temperature setting shaft 5,
There is a temperature setting knob 6 rotatably attached to a knob attachment plate 7, and a female screw 6a is provided inside the temperature setting knob 6, and the male screw 5a is screwed therein.

A valve spindle 8 having a valve 11 is operably connected to the other end of the communication means 3, and an action point 2 is provided in the vicinity thereof.
In order to faithfully transmit the movement of the contact means 3 to the contact means 3, there is provided a spring 27 that works to press the contact means 3 against the action point 2.

The valve spindle 8 having the valve 11 at the tip is the control body 2
3, the valve 11 is located in the primary chamber 26 at a distance 12 from the through hole 24 of the partition plate 21. (The position of the valve 11 can be provided in the secondary chamber 25 if it is used such that the movement of the action point 2 of the temperature detector 1 is opposite to that of this embodiment).
The penetrating portion of the valve spindle 8 of the control main body 23 has a packing 9
The valve spindle 8 is slidable and airtight. Further, the seal packing 16 at the joining portion of the other gas passages is an instrument for opening and closing the gas passage, and an instrument knob 17 is attached. A container connector 15 is attached to the appliance 16 and a liquefied petroleum gas container (hereinafter referred to as gas container) 14 is connected thereto.

The position of the action point 2 of the temperature detector 1 is the action point 2 when cooling is rejected.
The area of the gas passage portion at the interval 12 between the through hole 24 and the valve 11 is larger than the orifice area of the nozzle 22 (that is, the maximum gas flow rate).

The operation in the above structure will be described. In the case of automatic control from room temperature, when the instrument knob 17 is operated to the ignition position in this state, the gas 13 in the gas vessel 14 is controlled by the vessel connector 15, the instrument vessel 16, and the control. It passes through the main body 23 and is ejected from the nozzle 22 into the burner 18. At the same time, a piezoelectric device (not shown) incorporated in the instrument 16 operates to spark the burner 18 from an ignition plug (not shown) of the burner 18 and ignite the mixed gas ejected from the burner 18 flame port. Done, flame 1
9 is formed. The object to be heated 20 is heated by the flame 19. The temperature of the object to be heated 20 gradually rises, and as long as this temperature rise continues, the position of the action point 2 of the temperature detector 1 moves in the direction A within the changeable range, and becomes the position of 2a at a certain temperature. The connecting means 3 pushed by the point 2 pivots in the C direction to the position 3a. Further, the valve spindle 8 and the valve 11 connected to the communication means 3 also move in the E direction, and the valve 11
Is 11a. In this way, the gap 12 between the through hole 24 and the valve 11 becomes gradually narrower as the temperature of the object to be heated 20 rises (interval area <orifice area). With the above movement, the inflow of gas from the primary chamber 26 to the secondary chamber 25 is restricted, the flame 19 becomes smaller, the amount of heat received by the object to be heated 20 decreases, and the amount of heat released from the object to be heated 20 and the amount of heat received. When the amounts of heat coincide with each other, the temperature rise of the object to be heated 20 stops and the change of the action point 2 also stops, so that the temperature of the object to be heated 20 is kept constant.

When the temperature of the object to be heated 20 decreases from the steady state When the temperature of the object to be heated 20 decreases next time when the cooking material or the like is put into the object to be heated 20, the action point 2 is in the B direction depending on the temperature. Changes to.

At that time, since the connecting means 3 is pushed in the D direction by the spring 27, the connecting means 3 rotates in the D direction according to the change of the action point 2, and the valve spindle 8 and the valve 11 operably connected to one end of the connecting means 3. Also slides in the F direction, the aforementioned interval 12 expands, the flow rate of the gas 13 increases, and the temperature of the object to be heated 20 begins to rise. In this way, the same operation as in the case of the automatic control from room temperature described above is performed.

[Operation of this device and setting of reference temperature]

The gas consumption of gas equipment, that is, the amount of gas ejected from the nozzle, Q is generally Q (Nm ³ / hr): Gas ejection rate k: Coefficient A (mm ² ): Nozzle orifice area H (mmH ₂ O): Gas pressure d: Element expressed by gas specific gravity and controllable from gas equipment side Where A is the nozzle orifice area and H is the gas pressure in the above equation.

This device is provided with a valve 11 for controlling the gas in a part of the gas passage, and changes the area of the gas passage opening of the gap 21 between the valve 11 and the through-hole 24 according to the temperature detected by the temperature detector 1 to change the nozzle. Is to control the gas pressure of the section.

[About setting of reference temperature]

A temperature scale (not shown) is displayed on the temperature setting knob 6. In order to bring the object to be heated 20 to a desired temperature, the desired value of the temperature scale of the temperature setting knob 6 may be set to the target (not shown) of the knob mounting plate 7. For that purpose, it is necessary to set the reference temperature. When the heat radiation amount and the heat receiving amount of the object to be heated 20 match, the temperature becomes stable. When the stable value is used as the reference temperature, the reference temperature varies depending on the type of gas equipment (for example, pottery, rice cooker, water heater, etc.), and the gas consumption for stabilizing the temperature is the same, even within the same type. Since the size of the load (the size of the object to be heated 20, the capacity of the device (gas consumption amount)) and the heat receiving efficiency of the object to be heated 20, that is, the structure, differ, in many cases, the set value is unique.

For example, when determining the reference temperature at 200 ° C., in the mounted state, the temperature setting knob 6 is turned so that the temperature of the object to be heated 20 becomes 200 ° C.
Changing the screwed state of a, moving the temperature setting shaft 5 in the G and H directions to change the distance 12 between the valve 11 and the through hole 24, and facing the target of the knob mounting plate 7 when stabilized at 200 ° C. The position of the temperature setting knob 6 is 200 ° C.

Similarly, a set temperature value suitable for the equipment, such as 100 ° C., 150 ° C ....

<Effect> The field of application of this device for gas appliances is wide, and the application effect is particularly great for kitchen appliances that perform frequent heat power adjustments. Electricity is no longer needed for a full-scale gas hot plate that is stable and temperature can be controlled, and a gas oven that has previously used electric power to detect temperature has a great effect of using electricity. The temperature is set by directly displacing the position of the fulcrum of the communication means to appropriately set the temperature. Therefore, the temperature can be set very easily and accurately, and the structure of the displacing means is extremely simple and compact. There is an effect such as being able to.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention. FIG. 2 shows the configuration of the second embodiment in which the packing of the valve spindle penetrating portion of the control body of the first embodiment is a diaphragm type packing. 1: temperature detector, 11: valve body, 16: instrument.

Claims (1)

[Claims] 1. A gas combustor configured to heat an object to be heated by combustion heat in a burner using gas as a fuel, the burner responding to an output of a temperature control means for detecting a temperature of the object to be heated. Between the gas flow rate control unit that controls the gas flow rate to the gas flow rate control unit and the temperature detection unit and the gas flow rate control unit, and change the degree of transmission of the detection output to the gas flow rate control unit to control the temperature of the object to be heated. In an automatic temperature control device comprising a temperature setting unit for setting, a fulcrum of a central portion of the temperature setting unit is pivotally supported by a temperature setting shaft, one end of which is interlocked with an action point of the temperature detecting means, and the other end of which is gas flow rate control. An automatic temperature control device for a gas combustor, comprising: connecting means that interlocks with a valve; and displacing means that displaces the temperature setting shaft to linearly appropriately displace the fulcrum of the connecting means.