CN1087739A - Ion smoke-sensitive detector capable of reliably finding failure - Google Patents
Ion smoke-sensitive detector capable of reliably finding failure Download PDFInfo
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- 239000000779 smoke Substances 0.000 title claims description 28
- 238000007689 inspection Methods 0.000 claims description 54
- 238000001514 detection method Methods 0.000 claims description 27
- 230000002285 radioactive effect Effects 0.000 claims description 23
- 230000000694 effects Effects 0.000 claims description 16
- 238000004088 simulation Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 19
- 238000010586 diagram Methods 0.000 description 11
- 229920006395 saturated elastomer Polymers 0.000 description 7
- 230000007423 decrease Effects 0.000 description 5
- 230000003321 amplification Effects 0.000 description 4
- 230000002950 deficient Effects 0.000 description 4
- 238000003199 nucleic acid amplification method Methods 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 241000202252 Cerberus Species 0.000 description 2
- 230000008034 disappearance Effects 0.000 description 2
- 238000005215 recombination Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000003534 oscillatory effect Effects 0.000 description 1
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Abstract
The invention belongs to an ion smoke-sensing detector for automatic fire alarm, which can detect the failure of the detector, especially the ionization chamber. A pair of checking electrodes is added in the ionization chamber to be checked, and the checking ionization current generated when a certain voltage is applied between the checking electrodes influences and changes the working ionization current between the original working electrodes in the ionization chamber, and the influence change has a corresponding relation with the ionization degree in the ionization chamber and the leakage current between the working electrodes, so that the ionization chamber is checked for failure by the method, and quantitative reference values of the ionization degree reduction and the leakage current related to failure in the ionization chamber can be respectively obtained, and the failure of the detector can be reliably and timely found or predicted.
Description
The present invention relates to a kind of ion smoke detector that is used for automatic fire alarm, can not only provide necessary signal, and can find detector, the particularly inefficacy and the occurent inefficacy of its ionization chamber part reliably the smog that occurs.
The automatic fire alarm device that scale is at present used, all with range detector as essential part, wherein the ion-type smoke detector is be widely used a kind of.Normally used ion smoke detector, with the ionization chamber part of band radioactive source as the Smoke Detection part, during detector work, enter the ionization chamber of detection smog when smog after, cause the variation of the work ionization current between the working electrode in the ionization chamber, its working electrode will change corresponding signal therewith and export in the detector corresponding signal amplification circuit, and the cooperation of other related circuit in detector, finish detection and other function corresponding to smog.Detector ionization chamber part is pressed ionization chamber structure branch, and two radioactive source double ionization chambers, single radioactive source double ionization chamber, several primary structure forms in single radioactive source single ionization chamber are arranged.The smog alarm signal output of detector, the detector that reaches the switching value output of promptly sending certain alerting signal after a certain amount of when smog is arranged, also have in certain smokescope scope, can export detector continuously with the analog quantity output of how many corresponding signals of amount of smoke.
Because automatic fire alarm system is higher to reliability requirement, a system often is made up of hundreds and thousands of detectors again, detector then is to work without cessation throughout the year, the various factors of external environment, as dust, moisture etc. can make detector gradually, especially it is in the Smoke Detection ionization chamber mis-behave of the state of opening wide and lost efficacy, relevant other parts also have the possibility that breaks down in the detector simultaneously, that fearness has only a detector to lose efficacy in the system like this, also will bring fearful hidden danger to total system, therefore reliably find the inefficacy of detector in time, can eliminate this hidden danger, guarantee system's reliably working.
Be to find the inefficacy of detector, mainly at present adopt two kinds of methods: the one, manually regularly one by one to detector smoke adding test, this method is simple, but time-consuming trouble is particularly like this to bigger system, and can not find the inefficacy that may occur at any time; Another kind is exactly so-called " simulation self check ", and promptly the circuit somewhere after detector ionization chamber Smoke Detection part is introduced one and checked line, by checking line, makes circuit part thereafter enter alarm condition artificially, to reach the purpose that lost efficacy and check.What adopt among the Decree of Patent Office of China CN2078000U is exactly more typical this method.This method is convenient, rapid, particularly is fit to bigger system, is the method that wide model adopts in the present reality, and is lower but the weak point of this method is a reliability.Clearly, be that circuit somewhere after the ionization chamber part adds owing to check signal, can only check like this in the detector this explorer portion before then not to be had the effect of inspection after this circuit part.A large amount of statistic analysis result from the ion smoke detector inefficacy, detect the detection ionization chamber part of smog, owing to be in the state of opening wide throughout the year, be subjected to the pollution of environment and lost efficacy the easiliest, its crash rate account for that whole detector lost efficacy more than 70%, so both made this " simulation self check " be able to by, its reliability also has only nearly 30%, for the higher fire-fighting security system of reliability requirement, this is difficult to satisfactory.
For remedying the core of detector, also be that crash rate is the highest in the detector detection ionization chamber partly can not get the deficiency that lost efficacy and check, because of initiating the Switzerland CERBERUS company that the ion-type smoke detector enjoys high reputation, in its a European patent document EP 423489, a kind of method of checking whether detector lost efficacy of beginning from ionization chamber has been proposed, its cardinal principle is by monitoring whether the saturated ionization current that detects between the ionization chamber working electrode is lower than a certain critical value, as the foundation of judging whether ionization chamber lost efficacy, be that degree of ionization is wherein descended, cause that the saturated ionization current between the ionization chamber working electrode descends, after this saturated ionization current is lower than a certain value, can think that ionization chamber has lost the detection effect of smog and lost efficacy, from the ionization chamber working electrode, can obtain corresponding output signal like this, and if circuit part after this is when breaking down, abnormal signal will appear in the detector signal output terminal, therefore can check whether whole detector lost efficacy.Though this method can be to the inspection of partly losing efficacy of detector, especially ionization chamber, this method exists the defective of reliability aspect in actual use.
From ion smoke detector, detect the process of ionization chamber considered repealed, ionization chamber is made wherein degree of ionization descend gradually by outside contamination when, often be accompanied by the insulated terminal that occurs on its working electrode and also polluted simultaneously and make and occur leakage current between the working electrode, originally requiring high-insulation between its working electrode (usually 10
14More than the Ω) and therebetween work ionization current is very small (usually 10
-12The degree of A) under the situation, this leakage current of Chu Xianing therebetween, making the ionization chamber output signal no longer is the unique exercising result of ionization current of wherein working, but wherein work ionization current and the leakage current stack coefficient result in back, even therefore the work ionization current in the ionization chamber disappears substantially, but owing to there is this leakage current, still may make the electric current after this stack between the ionization chamber working electrode and be not less than the critical value of a certain inefficacy, and make from the corresponding signal of ionization chamber output, therefore obtain identical result, make the ionization chamber inspection of can not being lost efficacy reliably.The weak point of this method is to distinguish ionization current and leakage current, only be suitable for not having the situation that leakage current occurs, and this situation is can not be guaranteed in the reality, so this method exists the defective aspect the reliability on practicality.
The purpose of this invention is to provide a kind of ion smoke detector, it not only can detect smog, provide corresponding signal in case of necessity, and at ordinary times during non smoke, can be as required at any time to detector, especially the core of detector, it also is the inspection of partly losing efficacy of crash rate is the highest in the detector ionization chamber, and can provide ionization chamber respectively, particularly detect in the ionization chamber about the degree of ionization decline of inefficacy and the quantitative reference value of leakage current, the reliable inefficacy of finding the arbitrary part of detector in time, and make the ionization chamber part before complete failure, just obtain precognition.
The object of the present invention is achieved like this: in the ionization chamber that needs are checked, except that common working electrode, other increases a pair of inspection electrode, this does the time spent to checking electrode at no-voltage, its ionization chamber part is identical with common detector ionization chamber part, therefore can finish detection effect, and provide corresponding signal where necessary smog.During non smoke, the ionization chamber part makes and forms a work ionization current I between this ionization chamber Central Plains working electrode under the effect of a certain voltage u at ordinary times
1If this moment, a pair of inspection electrode provided one to check voltage u
t, then this is to checking that electrode will form another ionization current-inspection ionization current I in this ionization chamber
2, because I
2Appearance, the ionization current I between the former working electrode
1Value will reduce I
2Value big more, under the constant condition of above-mentioned u value, I then
1Value reduce many more, this I
2To I
1Effect, be to realize by the ionization space in this ionization chamber, and and wherein whether exist leakage current and what irrelevant between the working electrode; If the degree of ionization in this ionization chamber descends or disappears (partially or completely being hidden as radioactive source) then this I
2To I
1The effect degree also will reduce thereupon or disappear, at the signal output part of ionization chamber working electrode, will have one with above-mentioned inspection voltage U
tThe variation of output signals amount △ U of correspondence before and after the effect
Ot, this variation of output signals amount △ U equally
OtAlso will be with the reducing or disappearance and correspondence reduces or disappear of degree of ionization in this ionization chamber, therefore by above-mentioned △ U
OtVariation, can obtain the quantitative reference value of degree of ionization in this ionization chamber.
For the leakage current that occurs between the working electrode in the above-mentioned same ionization chamber, degree of ionization in this ionization chamber is not have leakage current and above-mentioned u between a certain initial value, the working electrode wherein when constant, increases the inspection voltage u between a pair of inspection electrode in this ionization chamber
tValue, at above-mentioned inspection ionization current I
2With U
tIncrease and when increasing, ionization current I works in this ionization chamber
1Value will be with U
tIncrease and reduce, when checking voltage U
tBe increased to a certain magnitude of voltage U
TfAfterwards, work ionization current I after this
1To end, promptly substantially no longer with U
tThe increase of value and reducing, only keep a very little value by work ionization current I
F; Degree of ionization descends in this ionization chamber, and no leakage current occurs between the working electrode, at U
t〉=U
TfThe time, this moment by work ionization current I'
FValue can be greater than above-mentioned I yet
FValue; Degree of ionization descends in this ionization chamber, occurs leakage current I between its working electrode
3The time, at U
t〉=U
TfThe time, between its working electrode, will have one to comprise above-mentioned cut-off current I
FWith leakage current I
3Recombination current I
f, and I is arranged
f=I
F+ I
3Relation, leakage current I
3Before and after occurring, respectively at U
t〉=U
TfEffect under the variable △ I that obtains
fBe △ I
f=I
f-I
FBe leakage current I between its working electrode
3Size, in said process with △ I
fCorrespondence, ionization chamber part signal output terminal will have a u
0From u
0FTo u
0fVariable quantity △ u
Of, can obtain in this ionization chamber about leakage current I between its working electrode by this variable quantity
3Quantitative reference value.
Because adopt such scheme, this ion smoke detector not only can detect smog, provide corresponding output signal in case of necessity; At ordinary times during non smoke, can be at any time as required, by checking the effect of voltage, to detector, especially the core of detector, it also is the inspection of partly losing efficacy of crash rate is the highest in the detector ionization chamber, and provide its ionization chamber respectively, particularly detect the contaminated back of ionization chamber about the degree of ionization decline of inefficacy and the quantitative reference value of leakage current, because the contaminated inefficacy that causes of ionization chamber mostly is process slowly in practice, therefore can make the ionization chamber part before complete failure, just obtain precognition, simultaneously because when arbitrary part breaks down after the detector ionization chamber part, the output signal of detector is unusual with making, therefore can reliably find the inefficacy of the arbitrary part of whole detector in time, thereby eliminated ionization chamber and partly can not get checking the hidden danger of bringing, also avoided owing to adopt and to distinguish the not high defective of reliability in the reality that the inspection method of ionization current and leakage current is brought in the ionization chamber.
Below in conjunction with accompanying drawing above-mentioned related content is described further.
Fig. 1 is a kind of ion smoke detector principle schematic of common typical two radioactive source double ionization chamber structures.
Two detections are chained together with the comparison ionization chamber about among the figure, when a certain stable voltage u of power circuit two relevant work electrodes effect in figure of detector, then occur a work ionization current I in two ionization chambers, and between the corresponding working electrode of ionization chamber separately, obtain correspondent voltage u
1With u
0, and u=u is arranged
1+ u
0Relation.When extraneous smog enters the detection ionization chamber of opening wide, degree of ionization is wherein descended, and cause u
1With u
0Variation, with the output signal u of ionization chamber part
0The signal that outputs to detector amplifies and signal processing circuit, and by the cooperation of other circuit, can finish detection and warning to smog.Inefficacy among the figure checks that signal adds after the signal amplification circuit part, in order to check whether detector lost efficacy, therefore can not check the inspection of partly losing efficacy of signal effect ionization chamber before to this.
Fig. 2 is the detector ionization chamber partial ionization voltage shown in Figure 1 and the relation curve synoptic diagram of ionization current, and curve a is the u of the comparison ionization chamber of Fig. 1 middle and lower part
0-I ionization relation curve, curve b, c enter the corresponding u in front and back for smog in the detection ionization chamber of Fig. 1 middle and upper part
1-I ionization curve.As can be seen from Figure 2, smog enters and detects before and after the ionization chamber, when u remains unchanged, and u
0With u
1To change.
The synoptic diagram of ionization chamber part in Fig. 3 is that Switzerland CERBERUS company proposes in its patent EP 423489 a kind of detector of checking ionization chamber.
Fig. 4 is the u of ionization relation in the ionization chamber of Fig. 3
1-I curve synoptic diagram.
Among Fig. 3, a linear resistance R has replaced the comparison ionization chamber among Fig. 1, thereby has constituted the ionization chamber part of single radioactive source single ionization cell structure.As shown in Figure 3, when a certain voltage u acts on this ionization chamber part and the continuous increase of u value, the value of the corresponding work ionization current I that occurs also will increase thereupon in the ionization chamber, a saturated ionization current I occur until being tending towards saturated at last
d, this relation is shown in curve d among Fig. 4.When the degree of ionization in the ionization chamber former thereby when descending because of certain, its ionization curve also will change with corresponding saturated ionization current thereupon, if the relation of the ionization when degree of ionization wherein drops to a certain be considered to lose efficacy critical is shown in curve b, promptly the value of the saturated ionization current in ionization chamber is lower than the I among Fig. 4
bDuring value, can think that this ionization chamber lost efficacy, and reached the purpose that ionization chamber lost efficacy and checks with this.
But in the reality, when causing that after ionization chamber is contaminated degree of ionization descends, it is also contaminated and leakage current occurs between it to tend to be accompanied by working electrode insulated terminal in ionization chamber, this leakage current and above-mentioned voltage u also have certain dull relation that increases, suppose that the ionization curve after this moment, degree of ionization wherein descended should be curve a, but owing to wherein be accompanied by the leakage current of appearance, make recombination current that comprises above-mentioned ionization current and leakage current that obtains and ionization chamber both end voltage u from the ionization chamber working electrode
1Relation curve be curve c, as can be seen, always at this moment the current value among the curve c greater than the current value among the curve b, although the ionization chamber of this moment may lose efficacy, but this method can not be checked out this inefficacy, so this method exists the defective of reliability aspect in actual use.
Fig. 5 is the principle schematic of ionization chamber part in the present invention program's detector.
As shown in FIG., in the detection ionization chamber that needs are checked, except that common working electrode, other has increased a pair of inspection electrode.During work, a relevant voltage u who acts on the ionization chamber part remains unchanged; Between a pair of inspection electrode, there is not the voltage of inspection u
tDo the time spent, this ionization chamber part is identical with common detector ionization chamber part; When checking the voltage of inspection u is arranged between the electrode
tDo the time spent, the ionized state that detects in the ionization chamber will change.
Fig. 6 detects ionization chamber the voltage of inspection u is being arranged among Fig. 5
tDo the time spent, corresponding u
t-u
0The relation curve synoptic diagram when curve a is a certain original state for detecting degree of ionization in the ionization chamber among the figure, and is checked voltage u
tCorresponding u
t-u
0Relation curve, curve b is for detecting the degree of ionization decline corresponding u in back in the ionization chamber
t-u
0Relation curve; As shown in FIG., checking voltage u
tEffect under, before degree of ionization does not descend in the ionization chamber, at u
tA certain scope in, ionization current I works in this ionization chamber
1Will be with u
tIncrease and reduce and cause u
0Correspondence reduce, up to u
t〉=u
TfAfterwards, I
1Become a very little cut-off current I
Tf, and u
0End has an I therewith
TfCorresponding u
0F, corresponding this u is arranged simultaneously
tAt u
TfInterior u
0Variable quantity △ u
0T, shown in curve a among Fig. 6; Curve b is after degree of ionization descends in this ionization chamber among the figure, corresponding u
tAt u
TfReach in, the output signal u of the respective electrical that obtains at output terminal during from current cut-off
OfVariable quantity △ u with corresponding output signal
0t
Fig. 7 is for when checking between the electrode effect one voltage is got on the rank of width sometime, the output response synoptic diagram of curve a, b state in the corresponding diagram 6 that the output terminal of ionization chamber part shown in Figure 5 obtains; Be that response curve a, b among Fig. 7 is respectively before and after the decline corresponding with the front of degree of ionization in the above-mentioned detection ionization chamber as the u among Fig. 7
tThe response of effect.
As shown in Fig. 6 and Fig. 7, the decline of this degree of ionization makes ionization chamber output terminal u
0Intensity of variation from the △ u of curve a
0TChange to the △ u of curve b
0t, and the appearance of leakage current in this ionization chamber makes corresponding u
TfThe time u by ionization current arranged
0Value is from the u of curve a
OFChange to the u of curve b
Of, therefore by the corresponding voltage u that checks
tDo the time spent, the △ u that obtains from this ionization chamber output terminal
0tAnd △ u
Of, respectively with △ u
OTWith u
OFFor referencial use, can obtain in this ionization chamber that relevant degree of ionization descends and the quantitative reference value of leakage current.
The invention will be further described below in conjunction with drawings and Examples.
Fig. 8 is first embodiment of the invention principle of work synoptic diagram and specification digest accompanying drawing.
Fig. 9 to Figure 16 is the present invention's second to the 9th embodiment explorer portion synoptic diagram.
Figure 17 is the inspection power voltage supply principle schematic in the relevant check circuit in the embodiment of the invention.
In the embodiment shown in fig. 8, after separately radioactive source (6) reaches (7) and is connected in two detections and ionization chamber (3) relatively and (4) up and down, constitute the version of two radioactive source double ionization chambers, between the corresponding working electrode (5) and (8) of two ionization chambers, by corresponding power supply line (12) and (13), a stable operating voltage u who obtains that detector power circuit part (15) provides makes and forms work ionization current I in two ionization chambers
1As shown in FIG., in detecting ionization chamber (3), other has increased a pair of inspection electrode (10) and (11), and to checking that no-voltage is done the time spent between the electrode, this detector checks that with common nothing the ion smoke detector of electrode is the same at this.When the work of this detector of needs, one comes up from the respective addressed signal of controller (27) to outer end line (21) and (22), after the address circuit (14) of this detector is to its decoding and response, makes this detector work.Do not have the voltage of inspection between inspection electrode (10) in detector and (11) and do the time spent, this detector can detect smog by its ionization chamber part (1), and incite somebody to action corresponding therewith signal and send into its circuit part (2) by the signal output part (9) of its ionization chamber part, through one outer end line (21) is reached (22) again, to the signal of the relevant smog of controller (27) output, finish the function of smoke detection.
During non smoke, the detector that is in the work can under the control of its control circuit (17), make check circuit (16) provide certain to check voltage u to a pair of inspection electrode (10), (11) as required at ordinary times
t, because u
tEffect, make and check and in detecting ionization chamber, to form a corresponding ionization current I that checks between electrode (10), (11)
2, this electric current I
2Make the work ionization current I that detects between ionization chamber (3) Central Plains working electrode (5), (6)
1Change, and I is arranged
1With I
2Increase and the corresponding relation that reduces, this I
2To I
1The effect degree, relevant with ionized state in detecting ionization chamber (3), ionization chamber (3) is contaminated and wherein degree of ionization is descended or during disappearance when detecting, this I
2To I
1Effect, also will reduce thereupon or disappear.Check voltage by certain
Reference in this common electrode and the detector circuit " " three kinds of embodiment linking to each other illustrate principle, their separately principle of work and check that the performance review principle among the same respectively Fig. 8 of action principle, 9,10 embodiment that illustrated is corresponding and basic identical respectively.
Figure 14,15,16 is respectively the principle schematic of relevant explorer portion among the present invention the 7th, 8,9 embodiment, and promptly ionization chamber partly is three kinds of synoptic diagram of single radioactive source single ionization cell structure form.In the structure of this single radioactive source single ionization chamber, common comparison ionization chamber is replaced by an equivalent resistance (23).The version of the inspection electrode in the detection ionization chamber of illustrating among same and Fig. 8,9,10 is corresponding, also provided respectively among Figure 14,15,16 in detecting ionization chamber for a pair of reference of independently checking electrode, a certain inspection electrode and shared and this common electrode of a certain working electrode and detector circuit " " three kinds of embodiment principle schematic linking to each other, their work, inspection action principle, corresponding and basic identical respectively with the principle among Fig. 8,9,10 embodiment that illustrated.
In actual use, be in the state of opening wide because of detecting ionization chamber throughout the year, be subjected to external influence and pollution the easiliest, and compare ionization chamber owing to be in detector inside, be in simultaneously half-open spacious state again, so be subjected to external influence and pollution not too easily, therefore in the foregoing description, all only provided and checked that electrode is arranged in the structural representation that detects ionization chamber, but can be as required in the reality, for reaching, can relatively in the ionization chamber this inspection electrode structure be set also, and be furnished with corresponding circuit part comparing the purpose that ionization chamber also can be checked.
This band is checked the ionization chamber part of electrode structure, can partly cooperate with different signal processing circuit and other related circuit, form the detector of different output signal types, as can being treated to the signal of corresponding continuous analog quantity type, and join with corresponding communicating circuit wherein etc. with the corresponding signal that ionization chamber partly can be exported
u
tDo the time spent, the I that obtains
1Variable quantity △ i
1, and when detecting in the ionization chamber (3) a certain initial ionization state same u
tCorresponding △ I under the effect
1For referencial use, can obtain the quantitative reference value of degree of ionization in this ionization chamber; Corresponding with said process, by the output terminal (9) of ionization chamber part (1), will check voltage u
tMake time spent and △ i
1Corresponding output signal △ u
Ot, be sent to controller through outer end line (21) and (22) of signal amplification, signal Processing, communicating circuit (18), (19), (20) and the detector of detector, by controller with relevant data and above-mentioned △ I
1Corresponding △ u
OTRelatively calculate, can obtain this detector and detect the quantitative reference value that the relevant degree of ionization in the contaminated back of ionization chamber (3) descends.
Detect the detection of leakage current between working electrode (5), (6) in the ionization chamber (3) for this detector, can be by above-mentioned inspection voltage u
t〉=u
TfAfterwards, detect the work ionization current I between working electrode (5), (6) in the ionization chamber (3)
1Correspondence is ended, promptly have only one very little and substantially no longer with u
tIncrease and the electric current I that reduces
F, the correspondence when establishing no leakage current between above-mentioned working electrode (5), (6) is I by the work ionization current
F, and between them because of pollution leakage current I appears
3The time, at same u
t〉=u
TfUnder the condition, between working electrode (5), (6), will have one by work ionization current I
F(or its value is not more than I
F) and leakage current I
3The electric current I of sum
f, i.e. I
f=I
F+ I
3; And with above-mentioned I
FWhen for referencial use, this variable quantity △ I
f(=I
f-I
F), be and detect leakage current I in the ionization chamber (3)
3Size.I therewith
FAnd △ I
fCorresponding, on the output terminal (9) of ionization chamber part (1), can correspondence obtain u
0FWith △ u
0fThe effect of signal amplification in detector, signal Processing, communicating circuit (18), (19), (20), and the relevant signal of this detector is sent to controller by outer end line (21), (22) of detector, after calculating relatively by controller to its relevant signal, can obtain this detector detect ionization chamber (3) contaminated after, the quantitative reference value of relevant leakage current between the working electrode.
Fig. 9 is respectively the synoptic diagram of the present invention second and the relevant explorer portion of the 3rd embodiment with Figure 10, and promptly ionization chamber partly is two kinds of embodiment of two radioactive source double ionization chamber versions.
Among Fig. 9, constitute a pair of inspection electrode between the inspection electrode (11) in the detection ionization chamber (3) and the working electrode (5) in this chamber or (6), promptly check the electrode (11) that except that one another checks that electrode and working electrode (5) or (6) are shared.
Among Figure 10, detect a working electrode (5) and detector circuit in the ionization chamber (3) reference " " be connected, and check electrode as one simultaneously, check that with another electrode (11) constitutes a pair of inspection electrode, the feed circuit of inspection voltage are just variable comparatively simple in the check circuit like this.
Two kinds of embodiment of Fig. 9 and Figure 10 signal, except that the version of checking electrode with first embodiment shown in Figure 8 different, remaining work, inspection principle are all identical with it.
Figure 11,12,13 is respectively the present invention the 4th, five, the synoptic diagram of the relevant explorer portion of six embodiment, be that ionization chamber is partly for the detector principle schematic of single radioactive source double ionization chamber version, in the ionization chamber part of this single radioactive source double ionization chamber structure, battery lead plate (8) between radioactive source (6) and the working electrode (5) is divided into two ionization chambers with an original ionization chamber, i.e. detection ionization chamber, a comparison ionization chamber, Figure 11,12, a side that has all only illustrated radioactive source (6) in 13 is for comparing ionization chamber, one side of working electrode (5) is for detecting the situation of ionization chamber, can be as required in the reality, one side of radioactive source (6) is set to detect ionization chamber, and opposite side is set to the comparison ionization chamber.Among Figure 11,12,13, corresponding with the version of inspection electrodes of Fig. 8,9,10 signals, provided respectively in the detection ionization chamber to a pair of and checked independently that electrode, a certain inspection electrode and a certain work are extremely shared and reach
Close, by its outer end line sort signal is sent to controller and manages concentratedly and handle, the continuous variation of the relevant amount of smoke that this detector detects in can obtaining sometime, thus constitute the detector of " analog quantity output " type; Also can cooperate with the on-off-type signals treatment circuit that only ionization chamber output signal partly is treated to several corresponding states, and by corresponding communicating circuit etc. and outer end line, make controller obtain its corresponding signal, and obtain the corresponding state of this detector, and constitute the detector of Switch-Output Type.
For adapting to the needs of multiple occasion, this ionization chamber band is checked the ion smoke detector of electrode structure, corresponding address circuit can be arranged, communicating circuit etc., and have and get in touch with the centralized control machine and by the outer end line of controller power supply, constitute and be mainly used in the detector of a plurality of detectors by the system type of control and management of centralized control machine and power supply, also can the zero-address circuit, no communicating circuit etc., there is not the outer end line yet, and it is self-powered or make its independent power supply, and corresponding acousto-optic demonstration and warning device and corresponding circuit part arranged, can work alone, integrate the smoke detection warning device of the independent type of smoke detection and display alarm function.
Figure 17 provides inspection voltage u to a pair of inspection electrode in a kind of check circuit
tThe embodiment principle schematic.
Because the inspection voltage u on a pair of inspection electrode
t, to the work ionization current I in the same ionization chamber
1Effect, under certain condition, only check voltage u with this
tThe size of value is relevant, and irrelevant substantially with its direction, therefore should check voltage u
tBoth can be certain DC voltage, also can be certain alternating voltage.The inspection voltage that provides shown in Figure 17 promptly is a kind of inspection voltage of alternating current function.
As shown in figure 17, check circuit (16) passes through wherein corresponding oscillatory circuit or on-off circuit or other application circuit, make certain alternating voltage on the inductance primary coil (25), make the two ends of this inductance secondary coil (26) obtain to offer a pair of inspection voltage u that independently checks certain alternation of electrode by inductance (24)
t, realize this inspection voltage u
tThe purpose that is separated from each other with power unit on the operating circuit in the same detector.
Claims (6)
1, a kind of ion smoke detector that is used for automatic fire alarm, partly reaching corresponding circuit part by the ionization chamber Smoke Detection of being with radioactive source forms, it is characterized in that: except that common working electrode, other has a pair of inspection electrode in ionization chamber, and corresponding check circuit is arranged; This is in certain locations of structures relation to checking electrode and working electrode in same ionization chamber, this relation is: when check circuit when a pair of inspection electrode provides certain to check voltage, check and in ionization chamber, form corresponding inspection ionization current between the electrode, this electric current makes work ionization current between the former working electrode be subjected to influencing accordingly concurrent life by the ionization space in the ionization chamber to change accordingly, and the effect degree that this influence changes has corresponding relation with degree of ionization in this ionization chamber.
2, according to the described detector of claim 1., it is characterized in that: be in inspection electrode in the ionization chamber and can be a pair of insulated from each other and with ionization chamber in the also absolute electrode of mutually insulated of working electrode, also can be wherein a certain inspection electrode and a certain working electrode in the same ionization chamber be electrically connected shared.
3, according to claim 1. or 2. described detectors, it is characterized in that: the ionization chamber part that has this inspection electrode structure in the detector, can be the structure of two radioactive source double ionization chambers, also can be the structure of single radioactive source double ionization chamber, and can be the structure of single radioactive source single ionization chamber.
4, according to claim 1. or 2. or 3. described detectors, it is characterized in that: the detection ionization chamber that detects smog in the detector can have this inspection electrode structure, and when ionization chamber was compared in existence, relatively ionization chamber also can have this inspection electrode structure.
5, according to claim 1. or 2. or 3. or 4. described detectors, it is characterized in that: the ionization chamber part that has this inspection electrode structure in the detector, can partly make up with the related circuit that the ionization chamber part output signal can be converted to corresponding detector simulation amount signal output, also can make up with the circuit part that the ionization chamber part output signal can be converted to corresponding several detector's status signals.
6, according to claim 1. or 2. or 3. or 4. or 5. described detectors, it is characterized in that: this detector can have corresponding address decoding circuitry, communicating circuit and the outer end line that is connected with the centralized control machine and be powered by the centralized control machine, also can the zero-address circuit, communicating circuit and outer end line, and self-powered or independent power supply, and corresponding acousto-optic display part and corresponding circuit part are arranged.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93114534 CN1087739A (en) | 1993-11-26 | 1993-11-26 | Ion smoke-sensitive detector capable of reliably finding failure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93114534 CN1087739A (en) | 1993-11-26 | 1993-11-26 | Ion smoke-sensitive detector capable of reliably finding failure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1087739A true CN1087739A (en) | 1994-06-08 |
Family
ID=4990519
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 93114534 Pending CN1087739A (en) | 1993-11-26 | 1993-11-26 | Ion smoke-sensitive detector capable of reliably finding failure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1087739A (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011058569A1 (en) | 2009-11-12 | 2011-05-19 | Hetero Research Foundation | Process for the resolution of omeprazole |
| US8354541B2 (en) | 2008-11-18 | 2013-01-15 | Hetero Research Foundation | Optical purification of esomeprazole |
| CN103946703A (en) * | 2011-10-06 | 2014-07-23 | 密克罗奇普技术公司 | Differential current measurements to determine ion current in the presence of leakage current |
| CN104067325A (en) * | 2011-12-14 | 2014-09-24 | 密克罗奇普技术公司 | Method and apparatus for detecting smoke in an ion chamber |
| US9252769B2 (en) | 2011-10-07 | 2016-02-02 | Microchip Technology Incorporated | Microcontroller with optimized ADC controller |
| EP2980086A1 (en) | 2014-07-29 | 2016-02-03 | F.I.S.- Fabbrica Italiana Sintetici S.p.A. | Efficient process for the preparation of Esomeprazole (S)-Binol complex |
| US9257980B2 (en) | 2011-10-06 | 2016-02-09 | Microchip Technology Incorporated | Measuring capacitance of a capacitive sensor with a microcontroller having digital outputs for driving a guard ring |
| US9467141B2 (en) | 2011-10-07 | 2016-10-11 | Microchip Technology Incorporated | Measuring capacitance of a capacitive sensor with a microcontroller having an analog output for driving a guard ring |
| US9823280B2 (en) | 2011-12-21 | 2017-11-21 | Microchip Technology Incorporated | Current sensing with internal ADC capacitor |
-
1993
- 1993-11-26 CN CN 93114534 patent/CN1087739A/en active Pending
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8354541B2 (en) | 2008-11-18 | 2013-01-15 | Hetero Research Foundation | Optical purification of esomeprazole |
| WO2011058569A1 (en) | 2009-11-12 | 2011-05-19 | Hetero Research Foundation | Process for the resolution of omeprazole |
| US9437093B2 (en) | 2011-10-06 | 2016-09-06 | Microchip Technology Incorporated | Differential current measurements to determine ION current in the presence of leakage current |
| CN103946703A (en) * | 2011-10-06 | 2014-07-23 | 密克罗奇普技术公司 | Differential current measurements to determine ion current in the presence of leakage current |
| CN103946703B (en) * | 2011-10-06 | 2017-02-22 | 密克罗奇普技术公司 | Differential current measurements to determine ion current in the presence of leakage current |
| US9257980B2 (en) | 2011-10-06 | 2016-02-09 | Microchip Technology Incorporated | Measuring capacitance of a capacitive sensor with a microcontroller having digital outputs for driving a guard ring |
| US9252769B2 (en) | 2011-10-07 | 2016-02-02 | Microchip Technology Incorporated | Microcontroller with optimized ADC controller |
| US9467141B2 (en) | 2011-10-07 | 2016-10-11 | Microchip Technology Incorporated | Measuring capacitance of a capacitive sensor with a microcontroller having an analog output for driving a guard ring |
| CN104067325A (en) * | 2011-12-14 | 2014-09-24 | 密克罗奇普技术公司 | Method and apparatus for detecting smoke in an ion chamber |
| US9207209B2 (en) | 2011-12-14 | 2015-12-08 | Microchip Technology Incorporated | Method and apparatus for detecting smoke in an ion chamber |
| CN104067325B (en) * | 2011-12-14 | 2017-03-29 | 密克罗奇普技术公司 | For detecting the method and apparatus of the smog in ion chamber |
| US9823280B2 (en) | 2011-12-21 | 2017-11-21 | Microchip Technology Incorporated | Current sensing with internal ADC capacitor |
| EP2980086A1 (en) | 2014-07-29 | 2016-02-03 | F.I.S.- Fabbrica Italiana Sintetici S.p.A. | Efficient process for the preparation of Esomeprazole (S)-Binol complex |
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| C01 | Deemed withdrawal of patent application (patent law 1993) | ||
| WD01 | Invention patent application deemed withdrawn after publication |