CN100447490C

CN100447490C - Fire regulating device

Info

Publication number: CN100447490C
Application number: CNB021469172A
Authority: CN
Inventors: 林雄一; 清水正则; 水谷圭一
Original assignee: Rinnai Corp
Current assignee: Rinnai Corp
Priority date: 2001-10-22
Filing date: 2002-10-22
Publication date: 2008-12-31
Anticipated expiration: 2022-10-22
Also published as: TW593932B; KR20030035819A; JP3659344B2; JP2003130333A; CN1414295A; KR100500556B1

Abstract

When constantly detecting the opening of the flowrate adjusting valve (3) that is driven by a stepping motor (34) with the use of a rotary encoder, etc., the precision of the opening control is increased, but the control device becomes complicated. In addition, while controlling the opening of the flowrate adjusting valve (3) for controlling the gas amount supplied to a burner, such a high precision is not required. This invention controls the pulse number supplied to the stepping motor (34) by means of controlling the opening of the flowrate adjusting valve (3). In addition, when a micro switch (5) for actuating the ignition device is ON, the deviation of the pulse number and the actual opening is corrected.

Description

Fire power regulator

Technical field

The present invention relates to the some quench of burner and the fire power regulator that firepower is regulated are controlled, carried out to the gas delivery volume of the burner that is arranged at Gas appliance.

Background technology

As traditional fire power regulator known No. 2129580 communique of Japanese Patent Laid arranged, it is a kind of structure that the motor-driven valve that is used for the motor-driven that is equivalent to flow control device that firepower regulates is installed on each burner.In this structure, use common motor, therefore, need on the part of the drive system of the gyroaxis that comprises motor, position sensor be set.And by this position sensor adjusting aperture in the aperture that detects motor-driven valve.

In this fire power regulator mechanism,, position sensor must be set for detecting the aperture of motor-driven valve.And the aperture that must carry out motor-driven valve when often the position signal of sensor being checked is regulated.Therefore the aperture that produces motor-driven valve is controlled the extremely bad phenomenon of trouble.

The present invention in view of the above problems, its purpose be to provide a kind of need be by the motor-driven flow control device time by the fire power regulator of the aperture of the frequent monitor traffic governor motion of position sensor.

Content of the present invention

For solving above-mentioned problem, the structure of fire power regulator of the present invention is, will be by motor-driven, the gas quantity of opposed firing mouth supply gas increases and decreases control and in the downstream of closing the safety electromagnetic valve that feed path that flow control device that the supply that makes gas on the valve position stops is arranged on the gas of subtend flow control device opens and closes, it is characterized in that, stepper motor is used as described motor, when controlling the aperture of described flow control device by the umber of pulse of supplying with to stepper motor, on the full close position of flow control device and the institute's allocation between the fully open position, set the activated position of igniter, when arriving institute's allocation, the actual aperture of flow control device makes the igniter start, simultaneously to carrying out revisal by the aperture of described umber of pulse regulation and the error of actual aperture.

In the present invention,, therefore can control aperture by the umber of pulse of supplying with to stepper motor owing to adopt stepper motor as the motor that drives flow control device, again, can keep its aperture on the fixed aperture position.But when using stepper motor, tend to produce the aperture and the actual aperture that from the umber of pulse of supplying with, prefer and have a kind of like this mistake of taking off accent of error.For this reason, even when using stepper motor, also the same with in the past motor-driven valve, if the position sensor that detects aperture is set, then device can't be simplified.

In the present invention, do not detect the aperture of flow control device, but only use the umber of pulse of supplying with to stepper motor to carry out aperture control.But, then utilize the activated position of the igniter that in the fuel gas buring mouth, must set to carry out revisal for taking off the accent problem.

In addition, the rotating lobe plate of gyroaxis interlock with stepper motor also can be set, in case the microswitch of lobe plate revolution institute start when deciding angle is installed, is detected the activated position of the actual aperture arrival igniter of described flow control device by the start of microswitch.

From above-mentioned explanation as can be seen, the present invention is owing to the driving use stepper motor that adopts flow control device, by the structure of the aperture of flow control device being regulated to the umber of pulse of stepper motor supply, do not need to be provided with the position sensor of the aperture that frequent detection implements etc., make designs simplification thus.In addition, because the activated position of utilisation point fire device carries out revisal to the mistake of taking off accent etc., can not produce big error with respect to the aperture that prefers so can make actual aperture.

The simple declaration of accompanying drawing

Fig. 1 is the integrally-built block diagram of expression Gas appliance.

Fig. 2 is the cutaway view of expression valve module structure.

Fig. 3 is the structure chart of expression operation board part.

Fig. 4 is the action diagram of expression cam.

Control program figure when Fig. 5 lights a fire for expression.

Fig. 6 is the cam action figure of another example of expression.

The specific embodiment

With reference to Fig. 1, GT is the combustion gas workbench, has 2 stoves burner BC and 1 grid burner BG.These each burner BC, BG can be from gas supply pipe GP supply gas.The valve module 1 that firepower the is regulated usefulness shape of connecting respectively on each burner BC, BG connects.

This valve module 1 is made of safety electromagnetic valve 2 and flow control valve 3, the feed path of the gas of described safety electromagnetic valve 2 subtends each burner BC, BG opens and closes, and described each burner BC of flow control valve 3 subtends, BG gas supplied flow increase and decrease to regulate firepower.

With reference to Fig. 2, safety valve 2 will be loaded on electromagnetic coil portion 21 in solenoid and the spring.Valve body 20 applies power to closing the valve direction all the time by this spring, in case solenoid energising promptly overcomes the elastic force of spring and drives valve body 20 to valve opening position, makes the feed path of gas open.Otherwise in case stop to the energising of solenoid, then the magnetic force of solenoid disappears, and makes valve body 20 be back to valve opening position by the elastic force of spring, and the feed path of gas is closed.

Flow control valve 3 mainly is made of finger plate 31, fixed head 32 and restricting orifice 33.Refer again to Fig. 3, finger plate 31 turns round by the gyroaxis 35 that the driving shaft 34a with stepper motor 34 links.On the other hand, fixed head 32 is fixed on the framework of valve module 1.Offer slotted hole 31a at finger plate 31 upper edge gyratory directions, be formed with a plurality of through hole 32a at the track of fixed head 32 upper edge slotted hole 31a.

In case slotted hole 31a and through hole 32a are inconsistent, then gas can not pass through slotted hole 31a, thereby gas can not be supplied with to each burner BC, BG.Make finger plate 31 revolutions if drive stepper motor 34, then slotted hole 31a is consistent with through hole 32a gradually.Gas is by the through hole 32a consistent with slotted hole 31a.But because slotted hole 31a forms and 2 length that through hole 32a is consistent, therefore if make slotted hole 31a revolution, the combination of then consistent with slotted hole 31a through hole 32a is changed successively.

In addition, the combustion gas kind not simultaneously, must root a tree name combustion gas kind the quantity delivered of change gas.For this reason, on restricting orifice 33 by the overlapping restricting orifice that is formed with throttle orifice 33a 33 that has with the corresponding flow of various combustion gas kinds of liner 32b.Adopt this structure, if make finger plate 31 revolution, the throttle orifice 33a that can select gas to pass through successively then, the gas of the amount that will be regulated by throttle orifice 33a is supplied with to each burner BC, BG.In addition, change combustion gas kind time-like is as long as replace 33 a tree names of restricting orifice combustion gas kind after changing.

Yet stepper motor 34 turns round driving by the pulse signal of illustrated control device supply never.And the angle of revolution of driving shaft 34a is directly proportional with the umber of pulse of supply.In the present invention, the FEEDBACK CONTROL of continuous detecting such as encoder is not adopted in the actual angle of revolution of driving shaft 34a, but adopts the open loop control of only carrying out angle of revolution control by the umber of pulse of supplying with.When in case gas delivery volume arrival institute is quantitative, then must have the igniter start that makes not shown igniter and ignitor, each burner BC, BG are lighted a fire, so constitute by cam 4 being installed on the driving shaft 34a of stepper motor 34, connect in case will be installed near these cam 4 microswitches 5, can make igniter carry out start by cam 4.

With reference to Fig. 4, be at flow control valve 3 under the state shown in (a) of closed condition, make finger plate 31 revolutions in case drive stepper motor 34, then flow control valve 3 becomes out the valve state.But by the gas quantity that the aperture of opening the valve initial stage is supplied with is the gas quantity that is equivalent to weak fire, and amount is few.In this state, even the igniter start, each burner BC, BG can not light a fire.Therefore, on the time point that finger plate 31 is turned round approximately 110 degree, make the igniter start.In case finger plate 31 revolutions 110 degree, cam 4 is that interlock also turns round 110 degree, and shown in (b), cam part 41 is connected microswitch 5.

The position of these 110 degree is set on the weak fiery position that is close to the moderate heat position slightly.But under the state that makes finger plate 31 revolutions 110 degree, still can not supply with ignitable gas quantity to each burner BC, BG.In that igniter is gone ahead of the rest under the state of start, further make finger plate 31 revolutions, when the gas quantity of supplying with to each burner BC, BG increased, the gas quantity of supply had exceeded ignitable gas quantity, is lighted a fire by the igniter of start.

Be described further with reference to Fig. 5, in case the indication alignment control apparatus of will lighting a fire, then control device at first makes the N of 2 parameters and M be reset to 0 (S1).Secondly, make driving shaft 34a be inverted to initial point.Initial point can be connected by microswitch 5 and detect.When driving shaft 34a counter-rotating institute fixes time and when microswitch 5 can not cut out, parameter N carried out verification (S3), when being 0 than 1 little value, again driving shaft 34a counter-rotating institute is fixed time carry out initial point adjust in (S4), on parameter N, add 1 (S5).

Like this, even carried out 2 initial point adjustment, microswitch 5 also not when the closed position, enters S6 from S3, stops at its later start (S6) as the initial point mistake.If microswitch 5 confirms to cut out, then control device is supplied with 224 pulses to stepper motor 34, makes finger plate 31 revolutions.In addition, 224 pulses are equivalent to the i.e. angle of revolution of 130 degree, moderate heat position.

As mentioned above, microswitch 5 is set in the position of 110 degree formation on-state.110 degree are equivalent to 190 pulses in this example.Thus, if no abnormal, then control device was connected microswitch 5 before all 224 pulses of output.Like this, even export 224 pulses, when microswitch 5 does not become connection, the control break that it is later (S8, S9) takes place as a kind of operation board start mistake that is fixed in finger plate 31 grades.On the other hand, in case microswitch 5 connections, then when the umber of pulse that its time point has been exported is remembered, if umber of pulse exceeds 200, then not to end igniting action immediately, but, parameter M is reset to 1 (S10, S11, S12) in the revolution way as the slight accent etc. that takes off takes place.

The connection of microswitch 5 is that expression finger plate 31 turns round 110 degree at least, can be close to ignitable gas quantity by the gas quantity of flow control valve.But on this time point, because of valve do not left by safety valve, so gas can not be supplied with to burner.In case microswitch 5 is connected, then igniter start (S13) makes finger plate 31 continue revolution.Become 224 pulses from the umber of pulse of control device output, in case arrive the moderate heat position, then stepper motor 34 stops (S14).If be in the moderate heat position, then owing under this state, make safety valve 2 drive valve by lighting a fire to the gas quantity of burner supply, and to burner supply gas light a fire (S15).

Valve left by safety valve 2, after the burner supply gas begins, in case lighted a fire with interior affirmation at 10 seconds, then stops igniter (S16, S17), if can not confirm igniting at 10 seconds with interior, then enters step 18 (S18).When the number of steps of described microswitch 5 connection time points has exceeded 200, in step 12 (S12), parameter M is reset to 1.It is the occasion that a kind of mistake of slightly taking off accent etc. takes place that step M is reset to 1, if parameter M still is 0, then igniter stops, and is judged as igniting mistake (S19, S20, S21) safety valve 2 is closed valve after.If parameter M is reset to 1, then be judged as finger plate 31 and can not fully return back to the moderate heat position, stop igniter, after being closed valve, safety valve 2 is judged as operation board start mistake (S22, S23, S24).

Like this, but since the set positions that microswitch 5 is connected being close to the closing on the valve side of ignition location, therefore as long as valve module 1 does not take place unusually, if carry out ignition operation, then microswitch 5 connection that is bound to.Thus, when microswitch 5 access failures, can detect unusual generation.Can carry out revisal to the umber of pulse of control thereafter by the microswitch 5 actual umber of pulses of connecting time point again.That is, in the position of original 190 pulses, microswitch 55 should be connected, but in fact, with the difference of the umber of pulse of connecting time point and 190 pulses as error, the control revisal after the end of can lighting a fire.

Again, after the igniting during the quench, because of microswitch 5 necessarily is in closed condition, so can from the umber of pulse of the umber of pulse of on-position and closed position, calculate hysteresis, in control device, when controlling next time, this hysteresis is applicable to the control when reversing with this hysteresis of calculating memory.

Yet, in this example, because of safety valve 2 is housed respectively, make stepper motor 34 revolutions, the value of renewable compensating value and hysteresis under the state that closes valve on flow control valve 3 so still be at the safety valve 2 of burner between stand-down.Like this, under the state that burner stops,, then can prevent the affixed of O shape ring and other sliding part in case make stepper motor 34 revolutions.In addition, when under not making stepper motor 34 rotating states over a long time, carrying out ignition operation, also can take to carry out affixed method by the frequency number, the increase torque that after the revolution beginning, reduce the pulse signal of supplying with to stepper motor 34 soon.

When taking fire mouth igniting conditioning, often need to use the firepower between moderate heat and the strong fire to nurse one's health for a long time.In this occasion, in nursing one's health for a long time,, microswitch 5 do not close because of still keeping on-state, wait the error accumulation that causes so might produce by taking off to transfer.For this reason,, then can automatically stepper motor 34 be urged to and close the valve side, microswitch 5 cuts out and carry out revisal, also can make it return original position in case the accumulative total that is under the on-state umber of pulse of supplying with to stepper motor 34 in the control aperture exceeds institute's definite value.

In above-mentioned example, after the revolution of stepper motor 34 begins, be turned back at microswitch 5 during 110 degree of connection, in fact control device can not detect the revolution of stepper motor 34.For this reason, as shown in Figure 6, also can form stage portion 42, when stepper motor 34 revolution beginnings, immediately the 1st contact of microswitch 5 be connected.This microswitch 5 has the 1st contact and the 2nd contact, by stage portion 42 the 1st contact is connected, and by cam part 41 the 2nd contact is connected.

Yet, in this example, cam 4 forms 1 section, what use is 1 microswitch 5, but also cam 4 can be made 2 sections, the microswitch of 2 microswitch 5, one sides being installed corresponding to each cam 4 is connected in the moderate heat position simultaneously, and the opposing party's microswitch is connected on strong fiery position.Like this, by 2 microswitches are set, can freely select moderate heat igniting and strong fire igniting.

Claims

1. fire power regulator, wherein, will be by motor-driven, the gas quantity of opposed firing mouth supply gas increases and decreases control and in the downstream of closing the safety electromagnetic valve that feed path that flow control device that the supply that makes gas on the valve position stops is arranged on the gas of subtend flow control device opens and closes, it is characterized in that, stepper motor is used as described motor, when controlling the aperture of described flow control device by the umber of pulse of supplying with to stepper motor, on the full close position of flow control device and the institute's allocation between the fully open position, set the activated position of igniter, when arriving institute's allocation, the actual aperture of flow control device makes the igniter start, simultaneously to carrying out revisal by the aperture of described umber of pulse regulation and the error of actual aperture.

2. fire power regulator as claimed in claim 1, it is characterized in that, the rotating lobe plate of gyroaxis interlock with stepper motor is set, in case the microswitch of lobe plate revolution institute start when deciding angle is installed, is detected the activated position of the actual aperture arrival igniter of described flow control device by the start of microswitch.