KR100500555B1 - Apparatus for controlling heating power - Google Patents

Abstract

The present invention relates to a thermal power control device that controls the gas supply amount to the burner installed in the gas mechanism to perform the ignition, fire extinguishing and thermal control of the burner. If the sensor is always detected, the accuracy of the opening control is improved, but the control device is complicated. Therefore, although the opening degree of the flow regulating valve is controlled by the number of pulses supplied to the stepping motor, it is necessary to reliably correct the deviation of the pulse due to the lamp lamp. Therefore, when the micro switch set to the fully closed side is turned on at the position which becomes the amount of gas required for ignition, the deviation between the pulse number and the actual opening degree is corrected.

Description

Fire control device {Apparatus for controlling heating power}

The present invention relates to a fire control device for controlling the amount of gas supplied to the burner installed in the gas mechanism to perform the ignition, fire extinguishing and fire control of the burner.

As a conventional thermal control apparatus, a motor-driven electric valve corresponding to a flow rate regulating mechanism for controlling thermal power is provided for each burner according to Patent No. 2129580. A normal motor is used here, and for this reason, it is necessary to provide a position sensor to a part of a drive system including a rotating shaft of the motor. The opening degree is adjusted by detecting the opening degree of the electric valve by the position sensor.

Therefore, in this thermal power control mechanism, a position sensor must be provided in order to detect the opening degree of the electric valve. Then, the opening degree of the electric valve must be adjusted while searching the output signal of the position sensor at all times.

In such a case, it is conceivable to use a stepping motor as a motor for driving the flow regulating mechanism, and to control the opening degree by the number of pulses supplied to the stepping motor. In this way, the stepping motor can be used to maintain the opening degree at a predetermined opening position.

However, when the stepping motor is used, there is a possibility that an error such as an outage phenomenon occurs in which the opening degree and the actual opening degree that are assumed to be different from the supplied pulse number may occur. Therefore, it is conceivable to control the opening degree only by the number of pulses to be supplied to the stepping motor without detecting the opening degree of the flow regulating mechanism.

Accordingly, the present invention was made in view of the above problems,

SUMMARY OF THE INVENTION An object of the present invention is to provide a thermal control apparatus capable of reliably correcting an error without the need to constantly monitor the opening degree of the flow regulating mechanism by the position sensor when driving the flow regulating mechanism with a stepping motor.

Thermal control apparatus according to the present invention for solving the above problems is a flow regulator which is driven by a motor, and controlling the gas amount to supply the gas to the burner and at the same time stop the supply of gas in the closed valve position, flow rate regulator In a thermal power control device provided downstream of an electronic safety valve that opens and closes a gas supply path of a furnace, a stepping motor is used as the motor, and the opening degree of the flow regulating mechanism is controlled by the number of pulses supplied to the stepping motor. At the same time, the operating position of the switch is set from the position where the opening degree of the flow regulating mechanism becomes the amount of gas necessary for ignition, and when the operating position of this switch is reached, the opening degree and the actual opening degree defined by the pulse number are set by the operation of the switch. It is characterized by correcting the error between and.

According to the above configuration, since the switch always operates when the valve is opened in the fully closed state when the flow control mechanism is in the fully closed state, the correction is surely performed.

Moreover, the cam plate which rotates in conjunction with the rotating shaft of a stepping motor, and the micro switch operated by a cam plate are provided, and this micro switch was made into the said switch, It is characterized by the above-mentioned.

With reference to FIG. 1, GT is a gas table and is equipped with two furnace burner BC and one grill burner BG. Gas is supplied to each burner BC (BG) from the gas supply line GP. A thermal power control valve unit 1 is connected in series to each burner BC (BG).

The valve unit 1 adjusts the thermal power by increasing or decreasing the flow rate of the gas supplied to the electronic safety valve 2 and the burners BC and BG, which opens and closes the gas supply paths to the burners BC and BG. It consists of the flow regulating valve 3 performed.

Referring to FIG. 2, the safety valve 2 incorporates a solenoid coil and a spring in the solenoid portion 21. The valve body 20 is always pressed to the closing side by this spring. When energized by the solenoid, the valve body 20 is driven to the open side against the pressing force of the spring, and the gas supply passage is opened. On the contrary, when the energization to the solenoid coil is stopped, the magnetic force caused by the solenoid coil is dissipated, the valve body 20 is returned to the closing side by the pressing force of the spring, and the gas supply passage is closed.

The flow regulating valve 3 mainly consists of the rotating plate 31, the fixed plate 32, and the orifice plate 33.

Referring again to FIG. 3, the rotating plate 31 is rotated by the rotating shaft 35 connected to the drive shaft 34a of the stepping motor 34. On the other hand, the fixing plate 32 is fixed to the chassis of the valve unit 1. The long hole 31a is opened in the fixed plate 32 along the rotational direction, and the plurality of through holes 32a are formed in the fixed plate 32 along the trajectory of the long hole 31a.

If the long hole 31a and the through hole 32a do not coincide, the gas cannot pass through the long hole 31a, and therefore, the gas is not supplied to each burner BC (BG). When the rotating plate 31 is rotated by driving the stepping motor 34, the long hole 31a coincides with the through hole 32a in turn. Gas passes through the through hole 32a corresponding to the long hole 31a. However, since the long hole 31a is formed to have a length corresponding to the two through holes 32a, when the rotating plate 31 is rotated, the combination of the through holes 32a corresponding to the long holes 31a is sequentially switched. Goes.

In addition, if the gas types are different, it is necessary to change the supply amount of the gas in accordance with the gas type. Thus, an orifice plate 33 having an orifice hole 33a at a flow rate corresponding to the gas type is provided on the upper surface of the fixed plate 32 with the packing 32b interposed therebetween. In this way, when the rotating plate 31 is rotated, the orifice hole 33a through which gas passes is sequentially selected, and the amount of gas regulated by the orifice hole 33a is supplied to each burner BC (BG). do. When the gas type is changed, only the orifice plate 33 may be changed in accordance with the changed gas type.

By the way, the stepping motor 34 is rotated by the pulse signal supplied from the control apparatus which is not shown in figure. The rotation angle of the drive shaft 34a is proportional to the number of pulses supplied. In the present invention, the open loop control is performed to control the rotation angle only by the number of pulses supplied, rather than the feedback control in which the actual rotation angle of the drive shaft 34a is continuously detected using an encoder or the like. However, when the gas supply amount reaches a predetermined amount, it is necessary to operate an ignition device having an igniter and an ignition electrode (not shown) to ignite each burner BC (BG), so that the drive shaft 34a of the stepping motor 34 is provided. The cam 4 was attached to the cam 4, and when the micro switch 5 provided in the vicinity of the cam 4 was turned on by the cam 4, the ignition device was configured to operate.

Referring to FIG. 4, when the flow control valve 3 is driven in the closed state (a), the stepping motor 34 is driven to rotate the rotary plate 31, and the flow control valve 3 is opened. do. In the initial opening of the open valve, however, the amount of gas supplied is very small, corresponding to a weak fire. Even when the ignition device is operated in such a state, it is impossible to ignite each burner BC (BG). Thus, the ignition device was operated when the rotating plate 31 was rotated about 110 degrees. When the rotating plate 31 rotates 110 degrees, the cam 4 also rotates 110 degrees, and the cam 41 turns on the micro switch 5 as shown to (b).

This 110 ° position is set from the middle light position to the slightly weak light position side. However, in the state which rotated the rotating plate 31 by 110 degrees, the gas of a ignition quantity is not supplied to each burner BC (BG) yet. If the rotating plate 31 is rotated again while the ignition device is operated in advance and the amount of gas supplied to each burner BC (BG) is increased, the amount of gas supplied exceeds the amount of ignitable gas, and the ignition device already in operation Ignition is performed by

5, when the ignition instruction is given to the control device, the control device first resets the two parameters (N) and (M) to zero (S1).

Then, the drive shaft 34a is reversed until it becomes the origin. The origin can be detected by turning off the micro switch 5. The drive shaft 34a is inverted for a predetermined time, and if the micro switch 5 does not turn OFF, the parameter N is checked (S3), and if the value is smaller than 1, that is, 0, the drive shaft 34a is again set for a predetermined time. (1) is added to the parameter (N) at the same time as the reference point adjustment (S4) is performed.

In this way, when the micro switch 5 is not turned OFF even if the home position is adjusted by 2 degrees, the process advances from S3 to S6, and the operation beyond that is stopped as an origin error (S6). When it is confirmed that the micro switch 5 is turned off, the control device supplies 224 pulses to the stepping motor 34 and rotates the rotary plate 31. 224 pulses correspond to a rotational angle of 130 °, which is the middle fire position.

The micro switch 5 is set to be turned ON at the position of 110 degrees as mentioned above. 110 degrees corresponds to 190 pulses in this embodiment. Therefore, if there is no abnormality, the micro switch 5 is turned on before the controller outputs all 224 pulses. Therefore, even when 224 pulses are output, when the micro switch 5 is not turned ON, a disc operation error such as sticking occurs in the rotating plate 31 and the subsequent control is stopped (S8, S9).

On the other hand, if the micro switch 5 is turned ON, the number of pulses already output at the time is memorized, and when the number of pulses exceeds 200, the ignition operation is not immediately stopped. Set the parameter M to 1 (S10, S11, S12).

The fact that the micro switch 5 is turned ON indicates that the amount of gas that the rotary plate 31 rotates by at least 110 degrees to pass through the flow regulating valve 3 is close to the amount of gas that can be ignited. At this time, however, since the safety valve 2 is not open, gas is not supplied to the burner. When the micro switch 5 is turned on, the ignition device is operated (S13), and the rotating plate 31 is rotated again. When the number of pulses output from the control device becomes 224 pulses and reaches the middle light position, the stepping motor 34 is stopped (S14). Since the ignition is possible by the amount of gas supplied to the burner in that state, the safety valve 2 is opened to supply gas to the burner, and ignition is performed (S15).

If the ignition is confirmed within 10 seconds after the safety valve 2 is opened and supply of gas to the burner is started, the ignition is stopped (S16, S17). When the number of pulses at the time when the micro switch 5 is turned on exceeds 200, the parameter M is set to 1 in S12. If the parameter (M) is set to 1, an error such as a hardness lamp is occurring. If the parameter (M) remains 0, the ignition stops and the safety valve (2) is opened and closed. It is judged that it is (S19) (S20) (S21). If the parameter M is set to 1, it is determined that the rotating plate 31 is not sufficiently rotated to the middle light position, the ignition device is stopped, the safety valve 2 is closed, and it is determined that the disk operation error (S22). (S23) (S24).

In this way, since the position where the micro switch 5 is turned on is set from the ignition possible position to the closed valve side, if no abnormality occurs in the valve unit 1, the micro switch 5 is always turned on when the ignition operation is performed. If the micro switch 5 is not turned on, abnormality can be detected.

In addition, the number of pulses in subsequent control can be corrected from the number of pulses at the time when the micro switch 5 is actually turned on. That is, although the microswitch 5 should originally be turned ON at the position of 190 pulses, the control after completion of ignition can be corrected by making the difference between the number of pulses and 190 pulses at the time of actually ON as an error.

In addition, since the micro switch 5 is always turned off until extinguishing after ignition, hysteresis can be calculated from the number of pulses in the ON position and the number of pulses in the OFF position. The calculated hysteresis is stored in the control device, and the hysteresis is applied to the control at inversion during the next control.

However, in this embodiment, since the safety valve 2 is provided in each of the flow regulating valves 3, the stepping motor 34 is rotated with the safety valve 2 closed while the burner is stopped, and the correction value is adjusted. And hysteresis can be updated. In addition, if the stepping motor 34 is rotated in the state where the burner is stopped in this manner, it is possible to prevent the 0-type ring and its other sliding portion from sticking. When the ignition operation is performed while the stepping motor 34 is not rotated for a long time, the frequency of the pulse signal supplied to the stepping motor 34 is reduced for a while from the start of rotation, and the torque is increased to prevent seizure. You may also do it.

When the burner is ignited and cooking is started, cooking is performed for a long time at a thermal power between a medium and a weak fire. In this case, since the micro switch 5 does not turn OFF while being cooked for a long time, there is a fear that an error due to a lamp light is accumulated. Here, when the cumulative number of pulses supplied to the stepping motor 34 with the micro switch 5 ON exceeds a predetermined value, the stepping motor 34 is automatically driven to the close valve side, and the micro switch 5 is turned on. It may be turned off to perform correction and return to the original position.

In the above embodiment, the controller cannot detect that the stepping motor 34 is actually rotating while starting the rotation of the stepping motor 34 and then rotating to 110 ° when the micro switch 5 is turned on. . Here, as shown in FIG. 6, as soon as the stepping motor 34 starts rotating by forming the step part 42, the 1st contact of the micro switch 5 may be made ON. The micro switch 5 has a first contact point and a second contact point, and the first contact point is turned on by the step portion 42 (b), and the second contact point is turned on by the cam portion 41 again. will be.

By the way, in the said embodiment, although the cam 4 is made into one stage and one micro switch 5 is used, two cams are made to correspond to each cam 4 simultaneously with the cam 4 made into two stages. The switch 5 may be provided so that the micro switch on one side is turned on at the middle light position, and the micro switch on the other side is turned on at the strong light position. By providing two micro switches as described above, the medium light ignition and the strong light ignition may be freely selected.

As described above, the present invention uses a stepping motor to drive the flow regulating mechanism, and is configured to adjust the opening degree of the flow regulating mechanism by the number of pulses supplied to the stepping motor. Is set to the fully closed side at the position where the flow opening mechanism becomes the amount of gas required for ignition, so the opening must be passed between the open valve and the closed valve, so that the correction can be performed reliably.

1 is a schematic diagram showing the overall configuration of a gas appliance to which a thermal power control apparatus according to the present invention is applied;

2 is a cross-sectional view showing the configuration of a gas unit in FIG.

3 is a view showing the configuration of a disk portion in FIG.

4 is a view showing the operation of the cam in FIG.

5 is a flow chart showing a control flow during ignition in the thermal power control apparatus according to the present invention, and

6 is a view showing the operation of the cam in another embodiment of the thermal power control apparatus according to the present invention.

<Explanation of symbols for main parts of drawing>

One ; Valve unit 2; Safety valve

3; Flow control valve 31; Tumbler

32; Fixing plate 33; Orifice plate

34; Stepping motor 4; cam

5; Micro switch

Claims (2)

Downstream of the electronic safety valve, which is driven by a motor and controls the amount of gas supplied to the burner, increases and decreases the flow rate of the gas at the closed valve position, and opens and closes the gas supply path to the flow control valve. In the thermal control device installed on the side, A stepping motor is used as the motor, and the cam rotates in association with the drive shaft of the stepping motor. The microswitch is operated by the rotation of the cam, and the rotary shaft of the flow regulating valve is connected to the cam so that the microswitch and the stepping motor are rotated. And the flow regulating valves interlock with each other to control the opening degree of the flow regulating valve by the number of pulses supplied to the stepping motor, and at the same time the opening degree of the flow regulating valve becomes the amount of gas necessary for ignition. And setting an operating position of the micro switch, and correcting an error between the opening degree and the actual opening degree specified by the number of pulses by the operation of the micro switch when the operating position of the micro switch is reached. delete