JPH054567B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a gas flow rate adjustment device that automatically adjusts the flow rate of a gas valve flowing into a combustion port of a heating device that uses gas as fuel.

Prior Art and Problems to be Solved by the Invention Conventionally, manual operation means for manually adjusting the opening/closing operation of a mechanical valve or electronic automatic adjustment means for adjusting the opening/closing operation of a solenoid valve step by step have been used. This used to adjust the flow rate of gas flowing into the combustion port of gas appliances, such as gas ranges and gas boilers.

The electronic automatic adjustment means of the solenoid valve can automatically adjust the flow rate of the combusted gas, but since the change in calorific value is adjusted step by step, it is not possible to precisely control continuous changes.

Manual operating means for mechanical valves allows humans to adjust the gas flow rate while changing the gas flow rate as continuously as possible when adjusting heating equipment, rather than step-by-step regulating means, but due to manual operation, heating equipment There were problems such as difficulty in expanding the functions of the system, complexity of the structure, difficulty in linear control, and decreased reliability due to failures.

SUMMARY OF THE INVENTION Therefore, in order to solve the above-mentioned problems, an object of the present invention is to provide a gas flow rate adjustment device that can linearly and automatically adjust the flow rate of gas flowing into combustion in a gas appliance.

Means for Solving the Problems As a means for achieving the above object, the present invention generates a rotational force corresponding to information indicating the calorific value, that is, the flow rate of gas, with a motor serving as a power generating means, and A movable shaft in which a movable rod having a conical shape and a central screw are integrated in the axial direction is screwed into a guide threaded pipe, and a power conversion means is provided, and the power conversion means is interlocked with the rotating shaft of the motor. The rotational force of the motor is controlled by a pulley that converts the rotational force of the motor into a linear motion, and the movable rod inlet has a gas inlet and a gas outlet, and the movable rod inlet into which the movable rod is inserted is connected to the gas inlet and the gas outlet. The fuel supply control means, which is composed of a main body that is formed so as to be in direct communication with the gas outlet and to communicate with the gas outlet, adjusts the linear momentum of the gas passage according to the linear momentum, that is, the amount of entry of the movable rod that is moved in the linear direction. The flow rate of the gas discharged to the outlet is adjusted, and the movable element of the sliding variable resistance is moved in accordance with the amount of entry of the movable rod by the rotation of the movable ring inserted on the outer peripheral surface of one end of the movable shaft. The valve opening/closing state sensing means detects the voltage corresponding to the resistance value that changes according to the movement of the movable element to sense the opening/closing state of the valve, and provides the set voltage to the motor to move the movable rod to gas. It is characterized by allowing the device to enter or retreat into the passage to adjust the amount of entry.

Function To explain the above-mentioned valve opening/closing state sensing means in more detail, the movable rod advances to a predetermined position while the motor is rotated according to the gas flow rate instruction information, thereby adjusting the gas outflow amount. The signal set by the variable resistor is compared with the above instruction information, and when they match, the rotation of the motor is stopped and the mover moves to the final position corresponding to the fully open or fully open/closed state of the valve. As a result, the maximum or minimum resistance value is set by the slide variable resistance, and the range of entry and retraction of the movable rod, that is, the length of the upper and lower limits of entry is determined.

In the present invention, a device excluding a motor serving as a power generating means is referred to as a calorific value control valve.

EXAMPLES Hereinafter, the present invention will be described in detail based on the accompanying drawings.

FIG. 1 is a schematic diagram showing a cross-sectional view of a gas flow rate regulating device according to the present invention.

In FIG. 1, the calorific value control valve has a pulley 3 fixed to the rotating shaft 2 of a DC motor 1 which is controlled by a gas flow rate instruction signal based on the calorific value of the thermal power, and a movable shaft that rotates in conjunction with the pulley 3. A central screw 4a and a movable rod 4b having a conical end are integrated in the axial direction of the shaft 4, and the central screw 4a of the movable shaft 4 is screwed into the guide threaded pipe 5, and the gas inlet 7 and the gas The movable rod 4b of the movable shaft 4 is fitted into a "T"-shaped main body 9, which has gas outlet ports 8 communicating with each other and a movable rod inlet port 6 directly connected to the gas outlet ports 8. Since the movable ring 10 is inserted into the outer peripheral surface of one end of the movable shaft 4, the sliding variable resistance is adjusted by rotating the movable ring 10. Twelve movers 11 are configured to be moved in a straight line.

The unexplained code 13 in the drawing is the mover entrance 6
14 is a bracket, and 15 is a fixing screw that allows the motor 1, the guide threaded pipe 5, and the main body 9 to be attached to and removed from the bracket 14.

FIG. 2 is a cross-sectional view of the movable shaft 4 that is interlocked with the pulley 3, and illustrates a state in which the pulley 3 is held in a notched portion at one end of the movable shaft 4 and is allowed to freely move. , Fig. 3 shows the main body 9 of the calorific value control valve in which the movable rod 4b is inserted.
This is a cross-sectional view illustrating a state in which the inner diameter D ₁ of the movable rod 4b is smaller than the inner diameter of the cock body 9, that is, the inner diameter D ₂ of the gas passage.

The effects of the gas flow rate regulating device of the present invention having such a configuration will be explained in parallel with the operation of a cooking device to which this device is applied.

FIG. 4 is an example in which the gas supply amount adjusting device according to the present invention is applied to a heating cooker, and is a schematic block diagram for controlling various operations of the heating cooker.

Here, the microcomputer 25 is an example of means for controlling various functions of the heating cooker, and performs function control by processing procedures for input and output as illustrated in FIG.

First, during initial operation, the microcomputer 25 receives an input signal from the function input section 16 and provides an ignition signal to the ignition circuit 19, which causes a high voltage discharge to be ignited.

If the fire is extinguished and gas leaks at the time of initial ignition or when the calorific value control valve is open during operation of the cooking device, the microcomputer 25 detects the gas leakage from the gas detection sensor 23 installed inside the cooking device. A signal provided, for example, a gas leak detection signal is detected, and a corresponding signal is immediately provided to the main valve drive circuit 29 and the alarm generation circuit 18, and the signal is provided from the gas cylinder (or tank) 31 to the cooker. The main valve 30 is driven so as to cut off the gas, and at the same time an alarm is generated.

If there is no gas leakage, the microcomputer 25 performs the function corresponding to the function selection signal input through the function input section 16, but at this time, the open/close state of the calorific value control valve of the gas flow rate regulator to which the present invention is applied Check whether the valve is open or closed.

With the valve in the open state, the microcomputer 25 inputs the flame detection signal provided from the flame detection sensor 21, and if no flame is detected, operates the ignition circuit 19 again to ignite the flame. , performs the set function operation when flame is detected.

On the other hand, when the burner 33 is heated and the temperature rises to a dangerous state while the cooking device is in operation, the microcomputer 25 inputs the burner temperature detection signal provided from the burner temperature detection sensor 22 and immediately At the same time as interrupting the cooking function, the alarm generation circuit 18 is activated to notify the danger state.

In the above operation, when the valve is in the closed state, the microcomputer 25 outputs a signal instructing the opening of the valve and provides it to the comparison section 26.
From the valve opening operation, that is, the calorific value control valve 3
A signal for controlling the backward movement of the movable rod 2 (4b in FIG. 1) is provided to the motor drive unit 27 to rotate the motor 1 in the reverse direction.

The open/close state of the calorific value control valve 13, for example, the movable rod 4b in the gas passage of the fuel supply control means.
Valve opening/closing position sensor 2 that detects the length of approach
8, the reverse rotation of the motor 1 is stopped when the movable rod 4b reaches a predetermined position, and gas is supplied through the gas outlet 8.

During automatic cooking, which is one of the functions of the heating cooker, the amount of food and drink and the heating temperature of the cooking state are sensed from the sensor 24 for detecting the cooking state of the food and drink, and are provided to the microcomputer 11. At this time, the microcomputer 11 outputs a heat generation instruction signal corresponding to the above-mentioned sensed temperature and provides it to the motor drive circuit 27 through the comparison circuit 26, and rotates the motor 1 to an extent corresponding to the predetermined heat generation amount instruction information. Calorific value control valve 3
Drive 2.

The comparison circuit 26 compares the voltage corresponding to the calorific value instruction information and the voltage corresponding to the current open/close state of the calorific value control valve 32, and controls the motor 1 until they match.
However, as a means for sensing the voltage corresponding to the current open/closed state of the calorific value control valve, the length of the gas flow path of the movable rod 4b that has entered the Kotoku body 9, that is, the length of the gas flow path of the calorific value control valve. There is a sliding variable resistor 12 that detects the open/closed state.

The above-mentioned entry length m is the length from the gas inlet 7 to the tip of the movable rod 4b entered in the direction of the gas outlet 8.

As described above, since the motor controls the opening and closing of the heat generation control valve based on the instruction information for changing the heat generation amount, the operation of the device for adjusting the gas flow rate will be described in detail.

When the motor 1 is driven, the rotating shaft 2 is rotated in a predetermined direction, and the pulley 3 is also rotated.

Therefore, when the movable shaft 4 is rotated, the central screw 4a is moved forward or backward along the guide threaded pipe 5, and the movable rod 3b also performs reciprocating linear movement through the gas passage of the fuel supply control device body 9. As a result, the tip of the movable rod 3b moves toward or retreats from the gas outlet 8.

The movable rod 4b of the above-mentioned calorific value control valve 32 is reciprocated and linearly moved, thereby varying the length m of the movement of the movable rod.

At the same time, the sliding variable resistance 1 is rotated by the rotation of the movable ring 7 inserted on the outer peripheral surface of one end of the movable shaft 4.
The second movable element 11 is also moved linearly in a reciprocating manner, and the length of the advance of the movable element 4b is varied by about m.

That is, the voltage provided to the comparator circuit 26 of the slide variable resistor 12 is variably determined depending on the position of the movable element 11, and this voltage is information regarding the open/close state of the calorific value control valve 32.

As described above, when the length m of the mover 4b changes, the amount of gas flowing out to the gas outlet 8
Cog is variable.

That is, in FIG. 3, if Di=π/4 (D ₂ ² −D ₁ ² ), then Cog=Cig×Di/m.

Here, D ₂ is the inner diameter of the Kotuku body,
D ₁ is the inner diameter of the movable rod 4b, and Cig is the amount of gas flowing into the gas inlet.

Di is the cross-sectional area of the outer periphery, and is the cross-sectional area of the space between the Kotuku body and the movable rod.

As a result, since the gas inflow amount Cig is normally constant, the gas outflow amount is adjusted by varying the length of entry of the movable rod of the calorific value control valve.

The relationship between the approach length m of the movable element 4b and the gas outflow amount is as shown in FIG. On the other hand, if the gas output amount is too small, the fire will be extinguished, so the upper and lower limits of the entry length m of the calorific value control valve are set by the final position to which the movable element 11 of the sliding variable resistor 12 is moved, The movable rod is allowed to move in or out only within that section (CVL in Figure 6).

An example of a detailed circuit for electrically controlling the operation of such a gas flow rate adjusting device will be described in detail with reference to FIG.

FIG. 7 shows a circuit suitable for electrically controlling a gas flow rate adjusting device applied to a multifunctional cooking device controlled by a microcomputer.

As shown in FIG. 7, the device that drives the DC motor 1 and controls the heating value of the cooking device to maintain the optimum heating value is configured to control the heating value by opening and closing a signal corresponding to the heating value instruction information and the heating value control valve. A comparison circuit 26 that determines the drive direction of the motor by comparing signals corresponding to the state; a motor drive circuit 27 that rotates the motor forward or backward based on a plurality of signals output from the comparison circuit 26; The valve opening/closing position sensor 28 senses the opening/closing state of the controlled calorific value control valve and provides a corresponding electric signal to the comparison circuit 40.

To be more specific, the voltage V _A of the signal corresponding to the calorific value information instructed by the microcomputer 25 is connected to the inverting terminal of the comparison operational amplifier OP ₁ and the comparison operational amplifier OP1.
The voltage V _B applied to the non-inverting terminal of OP ₂ and set by being varied by the variable resistor VR is a signal that detects the open/closed state of the calorific value control valve and is connected to the operational amplifier.
It is applied to the non-inverting terminal of OP ₁ and the inverting terminal of operational amplifier OP ₂ .

When the above voltage V _A is larger than the voltage V _B , a “high” level signal is output from the operational amplifier OP ₂ to turn on the transistor Q ₂ that rotates the motor 1 in the reverse direction, and the voltage V _B becomes the voltage V If it is larger than _A , a "high" level signal is output from the operational amplifier OP ₁ , and the transistor Q ₁ , which rotates the motor 1 in the forward direction, is turned "ON".

The above variable resistor VR is the slide variable resistor 12 of the gas flow rate adjustment device, and the DC power source E ₁ is connected to the resistor.
DC power supply E ₁ is divided into voltages along with R ₉ and R ₁₀ , and the sensing voltage V _B of the valve open/close state is measured by comparison circuit 2.
6.

That is, when the movable element 11 of the slide variable resistor 12 is moved in the heat generation amount control valve 32, the resistance value is changed, and thereby the above-mentioned sensing voltage _VB is applied to the comparison circuit 26 while being changed.

During initial operation, when the calorific value control valve 32 is closed, the detection voltage V _B of the valve open/close state is
Operational amplifier because the calorific value is lower than the indicated voltage V _A
The "high" level signal from OP ₂ passes through AND gate G ₃ and makes transistor Q ₂ conductive, thereby causing motor 1 to reversely rotate in the direction of opening heat generation control valve 32 .

As a result of the above operation, the valve 32 is opened and the movable element 11 of the slide variable resistor 12 is moved, and the sensing voltage V _B of the valve opening/closing state increases and becomes equal to the above voltage V _A , and the motor 1 rotates in reverse. is stopped, and the movable rod 4b stops retreating from the gas outlet.

On the other hand, when reducing the calorific value or stopping heating with the calorific value control valve 32 open, the valve opening/closing state sensing voltage V _B is the calorific value instruction voltage V _A
Since it is larger, the "high" level signal of the operational amplifier OP ₁ is inverted by the NAND gate G ₂ to make the transistor Q ₁ conductive, thereby causing the motor 1 to rotate forward in the direction of closing the heat generation control valve 32.

Further, as the valve 32 is closed by the above operation, the movable element 11 of the slide variable resistor 12 is moved, and the sensing voltage V _B is decreased to the above voltage.
When it becomes equal to V _A , the forward rotation of the motor 1 is stopped and the movable rod 4b stops moving toward the gas outlet.

In FIG. 7, the resistors R ₁ to _{R 5} connected to the non-inverting terminal of the comparison operational amplifier OP ₂ are for preventing continuous micro-movement phenomenon of the motor 1, and the diodes D ₁ and D ₂ means the above operational amplifier
This is to prevent the outputs of OP ₁ and OP ₂ from affecting the input voltage, and the NAND gate G ₁
, G ₂ and AND gate G ₃ are for preventing the motor drive transistors Q ₁ and Q ₂ from being destroyed when the circuit operates incompletely.

Also, diodes D ₃ and D ₄ are transistor Q ₁
This is to protect Q 1 and Q ₂ by absorbing the back electromotive force generated from within the motor 1 during ON/OFF operation of Q ₁ and Q ₂ .

Effects of the Invention As explained above, according to the present invention, when trying to adjust the thermal power of gas appliances, the gas flow rate regulating device can be used as a precision control device that can continuously vary the calorific value by linearly outflowing the gas flow rate. By changing the inner diameter of the calorific value control valve and the inner diameter of the movable rod and providing the corresponding microcontroller calorific value instruction information, it can be used not only for gas appliances but also for heating equipment that uses liquid fuel. can also be applied.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing a cross-sectional view of a gas flow rate regulating device according to the present invention, FIG. 2 is a cross-sectional view taken along line A-A in FIG. 1, and FIG. 3 is a cross-sectional view taken along line B-B in FIG. 4 is a block diagram of a control circuit when the device of the present invention is applied to a heating cooker, and FIG. 5 is a control circuit for operating the heating cooker to which the device of the present invention is applied depending on the operating state. A flowchart showing the processing procedure when a microcomputer is used in one example of the device; FIG. 6 is an operating characteristic diagram illustrating the relationship between the length of entry of the calorific value control valve and the amount of gas outflow in the device according to the present invention; FIG. 7 is a detailed circuit diagram for electrically controlling the gas flow rate regulating device according to the present invention. 1...Motor, 2...Rotating shaft, 3...Pulley, 4...Movable shaft, 4a:...Central screw, 4b...
...Movable rod, 5...Guide screw pipe, 6...Movable rod inlet, 7...Gas inlet, 8...Gas outlet, 9...
... Kotoku body, 10 ... Movable wheel, 11 ... Movable element, 12 ... Variable resistance, 13 ... Packing, 1
4...Bracket, 15...Fixing screw, 25...
Microcomputer, 26... Comparison circuit, 27... Motor drive circuit, 28... Valve opening/closing position sensor, 29
...Main valve drive circuit, 30...Main valve.

Claims (1)

[Scope of Claims] 1. A power generating means for generating rotational force with a motor, a power conversion means for converting the rotational force in the rotational direction into reciprocating linear motion, and a power converting means for adjusting the flow rate of gas in accordance with the linear motion. The gas flow rate is comprised of a fuel supply control means that causes the fuel to flow out and a valve movement restriction means that detects the open/closed state of the valve due to the above-mentioned reciprocating linear motion, so that the gas flow rate corresponding to the information indicating the calorific value is discharged. The power converting means is an adjusting device, and has a central screw 4a and a movable rod 4b that are integrally provided on a movable shaft 4 that is interlocked with a pulley 3 fixed to a rotating shaft 2 of a motor 1. The screw 4a is screwed into the guide threaded pipe 5, so that when the movable shaft 4 is rotated, the central screw 4a moves along the guide threaded pipe 5, and the movable rod 4b is moved in or out. Gas flow control device. 2. The gas flow rate regulating device according to claim 1, wherein the end of the movable shaft 4 has a notched portion, and the pulley 3 is fitted into the portion and allowed to freely move. . 3. The gas flow rate regulating device according to claim 1 or 2, wherein the end of the movable rod 4b has a conical shape. 4. A power generating means that generates rotational force with a motor, a power conversion means that converts the rotational force due to the rotational direction into a reciprocating linear motion, and a fuel supply control that adjusts the flow rate of gas to flow out in accordance with the linear motion. and a valve movement restricting means for detecting the opening/closing state of the valve due to the reciprocating linear motion, the gas flow rate regulating device is configured to discharge a gas flow rate corresponding to information indicating the calorific value, The fuel supply means has a gas inlet 7, an outlet 8, and a movable rod inlet 6 which is directly connected to the gas outlet 8 and into which the movable rod 4b is inserted. Consists of main body 9,
A gas flow rate regulating device characterized in that a packing 13 is interposed between the movable rod inlet 6 and the movable rod 4b. 5. A power generation means that generates rotational force with a motor, a power conversion means that converts the rotational force due to the rotational direction into a reciprocating linear motion, and a fuel supply control that adjusts the flow rate of gas to flow out in accordance with the linear motion. and a valve movement restricting means for detecting the opening/closing state of the valve due to the reciprocating linear motion, the gas flow rate regulating device is configured to discharge a gas flow rate corresponding to information indicating the calorific value, The gas flow rate regulating device is characterized in that the valve movement limiting means linearly moves the movable element 11 of the slide variable resistor 12 by rotation of a movable ring 10 inserted into the outer peripheral surface of one end of the movable shaft 4. 6 Valve movement limiting means is slide variable resistor 12
6. The gas flow rate adjusting device according to claim 1, wherein the movement range of the movable rod 4b of the movable shaft 4 is set so that the maximum or minimum resistance value is set depending on the final position of the movable element 11. 7. Compare the electric signal corresponding to the calorific value instruction information outputted from the microcomputer 25 with the signal detecting the opening/closing degree of the calorific value control valve of the fuel supply control means to determine the driving direction of the motor. It further includes a comparison circuit 26 for determining the level of the output signal of the comparison circuit, and a motor drive circuit 27 for controlling the motor 1 for driving the opening/closing of the heat generation control valve until the two comparison signals match. 2. The gas flow rate regulating device according to claim 1, wherein the valve movement restricting means for detecting the opening/closing degree of the valve is comprised of a valve opening/closing position sensor (28). 8. The gas flow rate regulating device according to claim 7, wherein the voltage of the valve opening/closing position sensor 28 is variably set depending on the opening/closing state of the calorific value control valve. 9. The gas flow rate adjustment according to claim 7, wherein the microcomputer 25 outputs calorific value instruction information corresponding to a change in calorific value based on a signal provided from the sensor 24 that detects the amount of food and drink and the heating temperature of the cooking state. Device.