TWI355626B - Fire detecting apparatus - Google Patents

Description

1355626 26469pif.doc IX. Description of the Invention: [Technical Profile of the Invention] The present invention relates to a conductor light-receiving element for making a body, etc., and particularly preventing an error from the external noise. 】 The household detects the flame of a gas burner or the like for its combustion (the oil burner sensor head and the detection device, the main flame-detecting device of the flame-detecting device includes a light-receiving head that emits visible light, for example The detection flame light receiving unit provides its driving power 2: the main power inspection gauge is connected upward, and the unit flame detection letter "the above optical documents 1, 2). 3", , person ^ (for example, refer to the patent, the fuel oil, for example In Fig. 4, the fuel nozzle 2 is provided in the nozzle (the injection pipe), and the ignition electrode 3 is provided at the nozzle opening of the air blower 1. The flame is detected by the flame close to the fuel nozzle 2 to control the combustion thereof. The fire of the fuel burner is set such that the sensing head 4 located in the fuel nozzle 2 is emitted, for example, by the flame of the nozzle opening of the nozzle 2, for detecting the formation in the fuel injector head 4. Receiving unit, visible light. In addition, as the main (4) CdS unit installed in the ignition control timing as shown in Fig. 5. Accepting the start command of the burner, first of all, the combustion control of the oily man is as follows: Fire transformer guards and makes the fire Wei Weiwei, The fuel valve is opened in the recording state, so that the fuel point 7 1355626 26469pif.doc which is ejected from the spark-stabilized fuel nozzle 2 will be ignited. Then, the fire generated by the fuel combustion is detected by the above flame detecting device. Then, the operation of the above-described ignition transformer is stopped, and the ignition control is completed (for example, refer to Patent Document 3). Japanese Laid-Open Patent Publication No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. Japanese Laid-Open Patent Publication No. Hei 6-288541.

SUMMARY OF THE INVENTION In recent years, due to restrictions on chemical substances such as R〇HS (Restricti〇n 0f Hazardous Substances),

Patent Document 1: No.

The use of Cd (wrong) is limited. Therefore, it has recently been attempted to replace the conventional CdS single-it, and the photodiode semiconductor light-receiving element is used as a light receiving unit of a fire detecting device. However, in the Cds unit, the response time is several tens of m seconds to several hundred m seconds, and in the semiconductor optical connector such as the photodiode, the time is up to the second, and the detection sensitivity is so 'there' The detection characteristics are easily affected by the fire money. There is also a problem in that, since the sensor head 4 equipped with the "receiving unit" is equipped with a blower as described above, it is not only affected by the service 1, but also generated by an ignition transformer that drives the ignition electrode 3. In view of the above problems, it is an object of the present invention to provide a flame detecting device having a simple structure, which uses a semiconductor light source such as a photodiode as a light receiving unit. In particular, the _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ , the conductor light-receiving element detects the light-receiving element to provide its driving = mounting body (four) - the above-mentioned semiconductor engraving #压亚经The above-mentioned cable detects the above-mentioned semi-conducting. In particular, the detecting signal wire determines whether there is a flame, and its characteristic is at t · 1 The +conductor light-receiving element _ is provided with a de-energized electric power = the flame detection signal is delayed in response to the special '_ (_dt+ the apparent appearance of the piece, as the above-mentioned semiconductor light The receiving element preferably uses, for example, a precursor: an amplifier that amplifies the rotation of the photodiode. The upper sensing device body has, for example, a first resistor connected in series to the driving J source and a second resistor, wherein the two-conductor light-receiving element is connected in parallel between the two ends of the first resistor, and the resistor is divided by the first resistor and the second resistor= Pressing to generate a driving voltage of the semiconductor light receiving element, and determining a voltage generated at a connection point between the first resistor and the second resistor to determine whether or not there is a flame. ° ° _ is preferably the above filter circuit - and has Preventing the semiconductor light receiving element from malfunctioning due to superposition on the Wei_Xun, that is, removing the noise function. _ With the flame detecting device thus constructed, the half (four) light contact element is disposed in the vicinity of the semiconductor light receiving device. The fire age is delayed by 9 1355626 26469pif.doc and then it is transmitted to the Wei circuit. Therefore, the response characteristic of the self-light receiving component is shaken. The response of the semiconductor light-receiving element itself is fast: two f:: fruit, that is, the flame slosh and reacts very quickly. 'The change of the flame detection signal that is outputted to the main body of the electric device by the filter circuit becomes slow and slows. False detection caused by flame sloshing. It is also possible to prevent the superposition of this by the above-mentioned filter circuit, which can effectively prevent the semiconductor light-receiving element from malfunctioning, such as ς=:, (latch叩), etc. The sensor head of the miscellaneous head is set in the blower and the ignition change is close to the crying and receiving element, and it is also possible to obtain the effect of preventing the semiconductor double-infrared noise source from being attached and the flame detection of the lamp to be stable. The other objects, features, and advantages will be more apparent. The abbreviated embodiment of the present invention will be described in detail with reference to the accompanying drawings. [Embodiment] The following is a description of the flame detection diagram of the present invention with reference to the accompanying drawings. 1 The flame detecting device of the embodiment is not constructed. In Fig. i, '1Q is a sensing device 3*=^^ which is mounted as a visible light receiving unit #+j, which is prepared by the human flame, provides the driving dust and the above electrical sense. 3^ Conductor light receiving element light receiving element 1 1 0p ^% . Detecting the semiconductor of the above-mentioned semiconductor _ money _ with or without flame detection device 26469pif.doc set the main body. The first fixed electric resistance of the detecting device / the first fixed resistor 2] / and the string - connected and then connected to the driving power source and the second fixed electric body 22, for example, the grounding side element is connected in parallel. The power-on galvanic 30 and the semiconductor light-receiving 22 have a function of driving the memory Vef 21 and the driving noise Vd of the second fixed resistor 11 and passing the above-mentioned semiconductor wire receiving member, and the first fixed electric device The driving dust does not have the output of the above-mentioned (5)-to-text element 11 (the voltage 21 at the connection point of the fire 22 and the second fixed) according to the above-described half-and-fixed resistor 22.22 flame detecting signal. The resistance receiving element η is connected to the semiconductor light by the Weishen, and the semiconductor light receiving forest is connected in parallel. The flame detection signal, and according to the emitted visible light, the output resistance ^ such as the voltage at the connection point = 匕 change makes the above fixed The detection device output (flame detection signal) configuration "is configured to determine the flame detection signal at the connection point 11 of the hair based on the change in the electric power generated as described above. In particular, the semiconductor light receiving element passes through the predetermined setting. The judgment valve 22 is configured to be in the presence or absence of fire 2... 2° is provided according to the presence or absence of fire, 2 is sent = 1355626 26469pif.doc pressure device (ignition electrode) 32, and a fuel valve The combustion control device 24 of each of the fuel nozzles) is self-evident, and the combustion control device 24 can be realized as a part of the functions of the microcomputer constituting the flame detecting unit 23. As described above, In a flame detecting device using a semiconductor light receiving element such as a Si photodiode 11 as a light receiving element for detecting visible light emitted from a fire, the present invention is characterized in that it is 'in sensing' as shown in the embodiment shown in FIG. On the head 1 (), a dark current adding circuit 12 and a filter circuit 13 are respectively disposed in the vicinity of the Si photodiode u, and a diode for preventing reverse connection in series with the Si photodiode u is inserted. As the above-mentioned Si optical package body, u is represented by a so-called composite type light in which a load resistor 11a is provided on the light-emitting diode U and a magnification of 11 11b for amplifying the flow thereof. However, when the two load resistors 113 and the amplifiers 11b are respectively supplied as a single component to the photodiode U. The dark current adding circuit 12 is, for example, a fixed resistance circuit 13 in which the ===diode η is connected in parallel. By electricity 13a and the capacitor 13 are constituted by a 3 low-pass filter. The circuit 13 has a function of delaying the photodiode formation == flame detection signal and outputting it to the above-mentioned Wei 3. The prevention is due to superposition on the above Wei 3G The function of the above-mentioned light-thunder-pole η malfunctioning, that is, the above-mentioned dark technique addition circuit 12 having the effect of removing the impurity, is used as the light receiving device and the light receiving element (light-receiving element) Compared with the previous cds unit of Pu'er, the response speed is several times faster, and it has the output current characteristic of the receiver according to the characteristics of 12 26469pif.doc characteristic A in Fig. 2. (70 degrees) is the approximate line flame), when the output is electric, and when it is low, it is especially in the dark (the visible light emitted by the flame; the number is about ^, the fire is measured in the same way; the intensity is increased, The output current increases accordingly. The difference is very suitable. & the output current characteristics are reduced in the measurement error but 'the above-mentioned wheel current characteristics of the photodiode" 11 = = electricity, % 3 〇 will be the above semiconductor 丼 in the inspection cry 0 2 Π P first connector (photoelectric The diode 11 is connected to the receiving component. : 丄 体 = = = 2, ^ 谷 1 looking for miscellaneous axis effects, will cause misuse. That is, in the state where the impedance of the semiconductor diode 11 is high (black dioxins), the above-mentioned semiconductor light-receiving element (photoelectric) detected by the 30 is made only by the minute noise level superimposed on the Wei 3G. The output of the diode) n occurs. As described above, the semiconductor light is received, and the (light-in-one body) 11 itself is disposed in the air blower 31 or the ignition pressure (ignition electrode) 32 and the like. In the flame detecting device, a fixed resistor in parallel with the semiconductor light receiving element (photodiode) 11 is connected in front of the semiconductor light receiving element (light source-pole body 11). It is intended to reduce the impedance in a dark state in which the semiconductor light receiving element (photodiode) η is observed from the detecting device main body 2 经 = electric winding 3 ,, thereby making the semiconductor light receiving element (photoelectric one) 11 is difficult to be affected by external noise. Specifically, as shown in Fig. 1355626 26469pif.doc 1 in the vicinity of the semiconductor light receiving element (photodiode) 11, the semiconductor light receiving element (photodiode) n parallel Connected as a fixed resistor for the current adding circuit 12, on the basis of this, the semiconductor light receiving element (photodiode) 11 is connected to the detecting device main body 20. As a result, The semiconductor light-receiving element (photodiode) 11 is connected in parallel with a constant resistance. When the impedance of the semiconductor light-receiving element (photodiode) 11 is higher than the resistance of the fixed resistor, the semiconductor light is transmitted through the cable 3 The receiving element (photodiode) 11 applies a driving voltage Vd ,•, and the current mainly flows through the fixed resistor. And, as the impedance of the semiconductor light receiving 70 (photodiode) 11 becomes lower, the semiconductor light receiving The output current of the element 2 (photodiode) 11 is increased. Thus, even in the dark day, as in the output current characteristic B shown in FIG. 2, the current of the smear is passed through the cable 30, thereby increasing The dark current when the semiconductor light receiving element (photodiode) 11 is observed through the cable 3〇. As described above, the fixed electric current is connected in parallel with the semiconductor light receiving element (photodiode) 11. The effect of increasing the dark current of the semiconductor light-receiving element (photodiode) π and reducing the impedance of the semiconductor light-receiving element (photodiode) 11 in the dark is apparent. In this case, the impedance of the semiconductor light-receiving element (light, diode) 11 can be suppressed to a level lower than a certain level. Therefore, even if electricity is placed in the vicinity of the noise generating source, the noise can be suppressed. It is possible to effectively prevent the erroneous detection of 14 26469 pif.doc from being mixed by the noise when the output of the semiconductor light receiving unit (1) is detected by the cable 30. In place of the above fixed resistance, according to the law, Lei Zheng 12, such as, the order of Cheng Cheng, the first Bu Wan type dark current is added to the private road 12, that is, according to the + conductor light receiving element

The output of = (4) is changed to the material of the large device llb, and the output of the H^ device is increased. In this case, for example, the phase G = the limb receives the output of the element (photodiode) n and changes the bias voltage, thereby causing the current output characteristic (gain) to change ^ or 'and also money After the digital conversion is performed by using the micro (4) or A/D rotary material to connect the component (photodiode) n, and the digital signal is transmitted, the output of the semiconductor diode η is used. In order to make the 鸠 conversion characteristic itself variable / (first power), however, even if it is implemented in the semiconductor light-receiving element as described above (the light is added to the dark current component to prevent the false detection of the spoon, the _ 3 也会 will also There is overlap of external noise, and the ability of the light-receiving element (photodiode) 11 to resist external noise is weak. 2. The external noise 'is easily caused to latch up the semiconductor light-receiving element (photodiode) itself. In the flame detecting device, a filter circuit 13 is provided in the vicinity of the semiconductor light receiving element (photodiode) 11 to avoid the semiconductor, and the receiving photo element (photodiode) is subjected to Electric slow 3Q applied The external noise is prevented, the lock of the semiconductor light-receiving element (photodiode) U is prevented, and the t-operation is malfunctioned. At the same time, the conductor light-receiving element (photodiode) n is electrically discharged through the filter circuit 13 described above. The flame detection signal outputted by 3() is delayed, thereby removing the unintended response component of the half-light 1355626 26469pif.doc 'body light receiving element (photodiode) due to swaying of the sputum. The semiconductor light-receiving element (photodiode) u is very fast compared to the conventional CdS unit, and only its visible characteristic changes slightly due to the sloshing of the flame, and it responds sensitively. Received light = strong change. Therefore, even if it is only a semiconductor light-receiving element (the output of the photoelectric two-intensity π (flame detection signal) is lowered by a slight flame sway), it may be mistakenly detected as a flame. In order to prevent such a problem, as described above, in the flame inspection, a j is provided in front of the semiconductor light receiving element (photodiode) n.

The wave circuit I3' thus delays the output (flame detection signal) of the above-mentioned semiconductor light receiving element J (electrode diode) 11 which responds quickly, whereby: the flame detecting signal_ is output to the Wei 3Q. In other words, the apparent response characteristic of the semiconductor light receiving element (photodiode i) n is delayed by the chopper circuit 13. In addition to the above-described filter circuit 13, except that the source of the ignition-to-pressure-transition noise is superimposed on the fire of the above-mentioned Wei 30, the operation of the Hongqiao County Reception Section 7 11 is stable. As a result, on the side of the detecting device main body 2G, the output of the semiconductor wire receiving element (two-body) 11 under the stability of the king (four) can be detected as a slow response without being flame-plasticized. Because of this, the fire can be measured arbitrarily. Especially in the vicinity of the conductor light receiving element (photodiode) 11, so as to prevent the semiconductor light receiving element from being caused by noise b °

Ah hh XM At I - polar body 1 1 The responsiveness of the material and the semiconductor light-receiving element (photoelectric 2 16 1355626 26469pif.doc polar body) 11 is improved. The above-described sense head 1G, that is, the semiconductor light receiving element (photodiode) 11 and the detecting device main body 2 are connected only by the double core electric gauge %. Therefore, there is a possibility that the semiconductor light receiving element is reversely connected to the detecting device main body 20. Since the conventional (10) = = 疋 has no polarity, there is no problem with the connection polarity of the detecting device main body 2 (). However, if the semiconductor light-receiving element (photodiode) is connected to the semiconductor light-receiving element (photodiode) η, the operational sense is unstable, and the output signal itself is not determined. Here, in the flame detecting farm, the diode 14 for preventing reverse connection is inserted in series in front of the semiconductor light receiving element (light 'electrode body 11), and the detecting semiconductor light receiving is provided on the measuring device main body 20. The component (photoelectric two > 0 11 reverse connection detection function and detection of the semiconductor light receiving element ^ electric diode) η short-circuit escaping road test and force. The reverse-linking L-force and short-circuit fault detecting function is realized by a function of comparing the electric power pre-set 2 values generated by the connection point of the first fixed electric power pi and the first solid electric resistance 22, the above-mentioned 阙The value is different from the threshold for determining all the hot flames described later. In the flame-testing county, the towel is inserted in series between the semiconductor light-receiving element-^diode U and the electric thin 3〇 to prevent the reverse connection, and the body is detected from the side of the detecting device. The driving power is not applied to the semiconductor light receiving element (photodiode), and the operation is performed from the + + conductor light receiving element (photodiode), not to the unintended output (flame detection signal). When the 17 丄 26469 pif. doc 疋 Si photodiode) U is reversed, the rim of the semiconductor is the oil photodiode 11 is T, and the sputum is detected without flame.

In the second plum tiff detecting device, in combination with the second A for preventing reverse connection, the detecting device main body 20 is provided with a semiconductor light receiving element (photodiode) and short-circuit failure detection in addition to determining whether or not there is fire. Features. In the above-mentioned reverse connection detection function, as shown in FIG. 3, when there is a voltage value generated according to the connection point of the above-mentioned first:: 疋 疋 阻 21 and the second fixed electric (four), the threshold value of the flame is determined. When the signal is given, the set reverse voltage threshold Vth2 is given a voltage value higher than the value Vihl, and the set short-circuit check valve value Vth3 is given a voltage value lower than the threshold value.

When detecting (4) the main body 2G is not connected to the semiconductor light receiving device (photodiode) u via Wei 3Q, if the voltage is generated at the connection point of the first fixed resistor 第一 spear first solid resistor 22 Therefore, when the semiconductor light receiving element (photodiode) is positively connected to the hard-working main body 2G by Wei 30, in the dark (no flame) state = only the upper 24 dark current adding circuit The electric power k of the increased dark current portion flows from the cable 30 through the sensor head 1 , and therefore, the voltage Vm tb generated at the connection point of the first fixed resistor 21 and the second fixed resistor 22 is the above-mentioned electric Vd is still a bit lower. _, the above-mentioned semiconductor light-receiving element (photodiode) 1! has a parallel action on the second fixed resistor 22, which is equivalent to shunting only the flow of the dark f-flow surface f, which results in 18 1355626 26469pif. Doc The above detection · νιη is lower than the driving voltage vd. When the semiconductor light-receiving element (the visible light generated by the butterfly is detected by the flame:) 11 detects the electric dust generated by the point when the flame is in the above-mentioned first fixed resistor 21 and the above-mentioned The value of the connection value Vth1 of the first solid resistor 22 is set to identify the voltage value of the above-described valve change for judging that there is a flame. The W voltage % is different from that of the light-receiving element, and the semiconductor light-receiving element (photoelectric two-pole reverse connection is received by the above-mentioned reverse-proof two-component (photodiode) 1U_-breaking conductor light. The dark core addition circuit 12 does not function. Even in the dark (no flame) state, the νω is not generated by the connection point of the second fixed resistor 22. Vd is lowered. The above-mentioned reverse connection detection threshold Vth2 is set so as to recognize the detection voltage Vin without the reverse connection. In the reverse connection state, even if there is a flame, the semiconductor element (photodiode) Since the detection voltage ν 施加 applied to the driving voltage Vd does not change, the detection voltage ν 施加 applied to the driving voltage Vd does not change. Therefore, it is possible to detect such a sorrow by using the above-described reverse detection threshold Vth2. The sensor head 1〇, that is, the reverse connection of the semiconductor light receiving element (photodiode) 11. When the semiconductor light receiving element (photodiode) U is normally connected to the detecting device main body 20, as long as the The semiconductor light-receiving element (photodiode) 11 functions normally. 'There is a flame including the above-mentioned dark current adding circuit 19 1355626 26469pif.doc - anti-heart-dry conductor light receiving element (light thunder body) 11 output maximum flame The detection signal (the second fixed resistor 21 and the second fixed resistor 22 = two, the above TM is as low as .V. However, if the semiconductor = body ^ fault, whether there is a dark current addition two

The two ends of the 疋 resistor 22 are short-circuited by the two poles for preventing reverse connection. Therefore, the electric power generated by the connection point of the first gorge resistor 21 and the second fixed electric power is reduced to (4). The upper threshold value Vth3 is set to be identifiable as the identifiable detection power is changed by the short-circuit fault of the semiconductor light-receiving element (the voltage of the semiconductor light-receiving element (light-to-pole, 1 *1 ^ ..., difference) U In the detecting device main body 2G, as described above,

The connection point of the second::1 and the second fixed resistor 22 is contacted with or without flame, and the functions of respectively receiving the components (photodiode) and connecting the short circuit are performed. The reliability, and (4) the actual execution of the flame, therefore, enables the combustion control to be performed reliably and stably. Also, the present invention is not limited to the above embodiment. Here, a passive filter circuit is used as the wave = path 13, and it is of course possible to use an active filter circuit using the body f#. Of course, for the filter circuit 13, the filter characteristics, 'according to the semiconductor light-receiving element electric diodes', the type of the external noise that is applied to the cable 3〇 and its characteristics, the incoming light 5 is can. For the case where it is suitable to use a semiconductor 20 26469pif.doc light-receiving element other than Si as the light-receiving unit, it is also within the scope of the invention. It can be used for the two lines: as defined above, the wire is not used for heat The present invention is not limited to the scope of the present invention: the protection of the present invention [a brief description of the drawings] FIG. 1 is a schematic diagram of the present invention. A graph of the light-receiving element (photodiode) with respect to the round current characteristics of the light intensity. , short circuit? into the 3 two table no flame judgment 阙 * Vthl, reverse connection judgment threshold value, measured h3 m in flame detection electric dust Vin diagram. The graph of the relationship between the schematic configuration of the non-gas combustion 11 and the heart of the flame detecting device and the mounting position of the head. Fig. 5 is a diagram showing the ignition control timing in the gas money device. [Main component symbol description] 7 port 1 感. Sensor head U. Half-body light receiving element (photodiode) 1 la : load resistor Ub: amplifier 12: Dark current adding circuit 13: Filter circuit 1355626 26469pif.doc 13a: resistor 13b, 13c: capacitor 14: diode for preventing reverse connection. 20: detecting device main body 21: first fixed resistor 9 22: second fixed resistor 23 : Flame detecting unit 24 : Combustion control device _ 30 : Cable 31 : Blower 32 : Ignition transformer (ignition electrode) 33 : Fuel valve (fuel nozzle)

Vc: power supply voltage

Vd : Drive voltage Vthl : Flame judgment threshold Vth2 : Reverse connection judgment value J _ Vth3 : Short circuit detection threshold 22

Claims (1)

1355626 26469pifl Revision date: June 7, 100 is the number of Chinese patents No. 96146227 No scribe correction. * Patent scope: 1. A flame detection device having a semiconductor light receiving element and a detection device The component is configured to detect visible light emitted by the flame, the detecting device body supplies a driving voltage to the semiconductor light receiving element via a cable, and detects a flame detecting signal of the semiconductor light receiving element through the cable to determine whether a flame is present, wherein: A filter circuit is provided in the vicinity of the receiving element, and the filter circuit delays the flame detecting signal of the semiconductor light receiving element and outputs it to the cable. 2. The flame detecting device according to claim i, wherein: the semiconductor light receiving element has a photodiode and an amplifier for amplifying an output of the electric diode. 3. The flame detecting device of claim 1, wherein: the above-mentioned inspector main body has a non-moving power supply connected in series, a resistor and a second resistor, in the first resistor or the second The semiconductor is connected in parallel between the ends via the cable, and the driving voltage of the semiconductor light receiving element is generated by applying a voltage to the power supply voltage through the first resistor and the second resistor, and determining that the driving voltage is A voltage generated at a connection point between the first resistor and the second resistor is used to determine the presence or absence of a flame. 4. The fire inspection operation according to the item of the fourth aspect of the invention, wherein: the wave circuit has a function of preventing the semiconductor light from being connected to the noise of the electric circuit and malfunctioning. 23 1355626 For the 9614627 Chinese pattern, no i..... Revision date: May 3, 1 Combustion control device 13 blower combustion valve I ignition transformer 31 32 33 昜10mA 1mA _ ΙΟΟμΑ B 卞____〆/ •1 1 10 100 1000 illuminance (1χ) output ΙΟμΑ current 1 μ A ΙΟΟρΧ /lOnA 0 (no flame judgment range flame Judgment range 2 1355626 0V 5V Yin "h reverse connection [vtn2, no flame" *Wa1_ - [ νιΠΙ ~ with flame ί_Vth3 1-sensor short circuit. Figure 3 C Burner start ▽ # 4 blower Ignition transformer Fuel valve Ignition transformer ON >4 - Ignition completed>4 Burner. Ignition I Fuel valve ΟΝΥ Flame