CN113567312A - Charge induction method dust concentration detection device with strong anti-interference capability - Google Patents
Charge induction method dust concentration detection device with strong anti-interference capability Download PDFInfo
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- CN113567312A CN113567312A CN202110838369.XA CN202110838369A CN113567312A CN 113567312 A CN113567312 A CN 113567312A CN 202110838369 A CN202110838369 A CN 202110838369A CN 113567312 A CN113567312 A CN 113567312A
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- 238000001514 detection method Methods 0.000 title claims abstract description 73
- 239000000428 dust Substances 0.000 title claims abstract description 61
- 230000006698 induction Effects 0.000 title claims abstract description 52
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000012545 processing Methods 0.000 claims abstract description 33
- 239000002245 particle Substances 0.000 claims abstract description 16
- 239000013618 particulate matter Substances 0.000 claims description 10
- 238000012935 Averaging Methods 0.000 claims description 3
- 230000009471 action Effects 0.000 claims description 3
- 238000005070 sampling Methods 0.000 claims description 3
- 239000007769 metal material Substances 0.000 claims description 2
- 239000000126 substance Substances 0.000 claims description 2
- 230000008859 change Effects 0.000 abstract description 8
- 230000003287 optical effect Effects 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
- G01N15/06—Investigating concentration of particle suspensions
- G01N15/0656—Investigating concentration of particle suspensions using electric, e.g. electrostatic methods or magnetic methods
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
Abstract
The invention relates to a charge induction method dust concentration detection device with strong anti-interference capability, and belongs to the technical field of dust concentration detection. The device comprises a shell, an inner cylinder, a motor, an inner cover plate, a signal processing circuit, a temperature and humidity sensor, an induction sheet and a shielding sleeve; the induction sheet is pasted on the inner wall of the inner cylinder; the shielding sleeve is arranged between the inner wall and the outer wall of the inner cylinder and is covered on the sensing sheet; the signal processing circuit is arranged on the outer wall of the inner cylinder; the temperature and humidity sensor is arranged on the inner cylinder wall and used for collecting the temperature of the dust passing through the hollow part of the inner cylinder; the inner cover plate is covered outside the signal processing circuit and the temperature and humidity sensor; the shielding sleeve and the inner cover plate are both connected with the sensing sheet and the negative electrode of the temperature and humidity sensor; the signal processing circuit is respectively connected with the sensing sheet and the temperature and humidity sensor and is used for processing and analyzing the collected dust electrical signals and the environment temperature and humidity information. The invention can eliminate external electromagnetic interference, eliminate the influence caused by the change of the flow velocity of the particulate matters and realize accurate and stable online detection of the dust particles.
Description
Technical Field
The invention belongs to the technical field of dust concentration detection, relates to the design of a dust sensor, and particularly relates to a charge induction method dust concentration detection device with strong anti-interference capability.
Background
The existing dust sensor mainly adopts an optical method and an electrostatic induction method, and the optical dust concentration sensor has the problems of optical window pollution, pipeline blockage and the like and needs frequent maintenance, so that the electrostatic induction dust concentration sensor which has the characteristics of maintenance free, low cost, simple structure, high sensitivity and the like needs to be developed.
The electrostatic induction method dust concentration detection technology is based on an electrostatic induction mechanism, the interaction of charged dust particles and an electrostatic detection electrode induces changed charge quantity on the surface of the detection electrode, and the dust concentration is determined by analyzing the change of the charge quantity. According to the description and the use condition of the electrostatic induction method dust sensor in the current product and the current literature, the electrostatic induction method dust concentration detection technology has the problems of unstable detection result and low detection precision, and is mainly caused by the following reasons: (1) the influence of external electromagnetic interference, the influence of external changing electromagnetic field on the detection result, such as electrostatic interference of human body, electromagnetic interference generated by switch closing, interference generated by frequency converter, etc.; (2) the flow velocity of the particulate matters in the detection area has a large influence on the detection result, and the detection result of the sensor needs to be increased along with the increase of the flow velocity of the particulate matters, so that the detection error of the electrostatic induction method dust concentration sensor is increased; (3) humiture in the environment influences the electrostatic property of particulate matter, and temperature and humidity in the environment change, and the electric charge amount that the dust granule was taken will change, and then influence the testing result of sensor.
Disclosure of Invention
In view of the above, the present invention provides a charge induction method dust concentration detection apparatus with strong anti-interference capability, which improves the precision and stability of an online detection technology, eliminates external electromagnetic interference, eliminates the influence caused by the change of the flow velocity of particulate matter, avoids the phenomenon of detection error increase caused by the change of ambient temperature and humidity, and realizes accurate and stable online detection of dust particles.
In order to achieve the purpose, the invention provides the following technical scheme:
a charge induction method dust concentration detection device with strong anti-interference capability comprises a shell 1, an inner cylinder 12, an inner cover plate 2, a signal processing circuit 4, a temperature and humidity sensor 5, induction pieces I-III (9-11) and a shielding sleeve 8, wherein the inner cover plate 2, the signal processing circuit 4, the temperature and humidity sensor 5, the induction pieces I-III (9-11) and the shielding sleeve 8 are arranged between the inner cylinder 12 and the shell 1;
the induction sheets I to III (9 to 11) are embedded in the inner wall of the inner barrel 12; the shielding sleeve 8 is arranged between the inner wall and the outer wall of the inner cylinder 12 and covers the induction sheet; the signal processing circuit 4 is arranged on the outer wall of the inner barrel 12; the temperature and humidity sensor 5 is arranged on the wall of the inner cylinder 12 and is used for collecting the dust environment temperature passing through the hollow part of the inner cylinder; the inner cover plate 2 covers the signal processing circuit 4 and the temperature and humidity sensor 5; the shielding sleeve 8 and the inner cover plate 2 are both connected with the negative electrode of the temperature and humidity sensor 5;
the signal processing circuit 4 is respectively connected with the sensing sheet and the temperature and humidity sensor 5 and is used for processing and analyzing the collected electric dust signals and the temperature and humidity information of the environment.
Preferably, the number of the sensing pieces is selectable.
Preferably, the device further comprises a fan 6 disposed at one end of the inner barrel 12.
Preferably, the shell 1 is a cuboid, and a wire outlet hole is formed in the side surface of the column body; the inner cover plate 2 is fixed on the inner cylinder 12 and matched with the wire outlet hole.
Preferably, an alarm is further arranged between the inner barrel 12 and the shell 1 and used for alarming when the dust concentration exceeds the standard.
Preferably, the inner cover plate 2 and the shielding sleeve 8 are made of metal materials, such as stainless steel.
Further, the detection method of the dust concentration detection device by the charge induction method specifically comprises the following steps:
s1: the sensing pieces I-III (9-11) are used as electrostatic detection electrodes, dust particles in the environment pass through a detection area under the action of the fan 6, the dust particles passing through the detection area induce changed induction charges on the surface of the detection electrodes, 3 induction signal processing circuits are connected to the rear ends of the sensing pieces, each induction signal is extracted, amplified, filtered and AD converted, and 3 signals x are output1、x2、x3；
S2: performing cross-correlation operation on x1 and x2, and x2 and x3 to obtain flow velocities v1 and v2 of the particles; averaging V1 and V2 to obtain a particulate matter flow velocity V;
s3: processing x1, x2 and x3 by 1.5-order central moments to obtain S1, S2 and S3, and determining an output detection value S-f (S) through a function f1、s2、s3)；
S4: and obtaining the temperature T and the humidity H of the environment through a temperature and humidity sensor, and calculating to obtain a particulate matter concentration value C by combining the particulate matter flow velocity V and the detection value S.
Further, in step S1, the sensing pieces i to iii as the electrostatic detection electrodes sense 3 sensing signals x1、x2、x3The sampling frequency is 2kHZ, and 1024 pieces of data are acquired, namely:
x1＝{n1,n2,n3,...,n1024}
x2＝{m1,m2,m3,...,m1024}
x3＝{p1,p2,p3,...,p1024}
after x1, x2 and x3 are processed by 1.5-order central moments, processing results s1, s2 and s3 of 3 groups of signals are obtained: :
further, in step S3, the calculation formula of the detection value S is:
wherein the content of the first and second substances,
further, in step S4, the calculation formula of the particulate matter concentration value C is:
and k is the influence coefficient of the flow velocity of the particulate matters on the detection result of the dust concentration, and w is the influence coefficient of the temperature and the humidity of the particulate matters on the detection result of the dust.
The invention has the beneficial effects that: the device of the invention adds the shielding sleeve and the inner cover plate which have shielding function at the outer ends of the induction sheet (namely the detection electrode) and the signal processing circuit, thereby avoiding the interference between the detection electrode and the signal processing circuit. The invention improves the precision and stability of the dust concentration online detection technology by the electrostatic induction method, eliminates the external electromagnetic interference, eliminates the influence caused by the change of the flow velocity of particulate matters, avoids the phenomenon of detection error increase caused by the change of environmental temperature and humidity, and realizes the accurate and stable online detection of dust particles.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.
Drawings
For the purposes of promoting a better understanding of the objects, aspects and advantages of the invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:
FIG. 1 is a schematic plan view of a charge-induced dust concentration detection apparatus according to the present embodiment;
FIG. 2 is a schematic sectional view taken along line A-A of FIG. 1;
FIG. 3 is a schematic cross-sectional view taken along line B-B of FIG. 1;
FIG. 4 is a flowchart illustrating a method for detecting the dust concentration by the charge-induced dust concentration detection apparatus in this embodiment;
reference numerals: the temperature and humidity sensor comprises a shell 1, an inner cover plate 2, a screw 3, a signal processing circuit 4, a temperature and humidity sensor 5, a fan 6, a lower cover plate 7, a shielding sleeve 8, induction sheets I-III, an inner cylinder 12, an outlet hole 13 and an alarm 14.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention in a schematic way, and the features in the following embodiments and examples may be combined with each other without conflict.
Wherein the showings are for the purpose of illustrating the invention only and not for the purpose of limiting the same, and in which there is shown by way of illustration only and not in the drawings in which there is no intention to limit the invention thereto; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", etc., based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not an indication or suggestion that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes, and are not to be construed as limiting the present invention, and the specific meaning of the terms may be understood by those skilled in the art according to specific situations.
Referring to fig. 1 to 4, fig. 1 to 3 show a charge induction method dust concentration detection apparatus with strong anti-interference capability according to the present embodiment, which includes a housing 1, an inner cylinder 12, a fan 6, a lower cover plate 7, an inner cover plate 2 disposed between the inner cylinder 12 and the housing 1, a signal processing circuit 4, a temperature and humidity sensor 5, induction sheets i to iii (9 to 11), and a shielding sleeve 8.
Wherein, the induction sheets I to III (9 to 11) are embedded in the inner wall of the inner cylinder 12 at intervals; the shielding sleeve 8 is arranged between the inner wall and the outer wall of the inner barrel 12 and covers the induction sheets I to III (9 to 11); the signal processing circuit 4 is arranged on the outer wall of the inner barrel 12; the temperature and humidity sensor 5 is arranged on the wall of the inner cylinder 12 and is used for collecting the temperature of dust passing through the hollow part of the inner cylinder; the inner cover plate 2 covers the signal processing circuit 4 and the temperature and humidity sensor 5; the shielding sleeve 8 is connected with the sensing pieces I-III (9-11) and the negative electrode of the temperature and humidity sensor 5. The signal processing circuit 4 is respectively connected with the sensing pieces I-III (9-11) and the temperature and humidity sensor 5 and is used for processing and analyzing collected electric dust signals and environment temperature and humidity information. The shielding sleeve 8 and the inner cover plate 2 are connected with the sensing pieces I-III (9-11) and the negative electrode of the temperature and humidity sensor 5 to form a shielding case. The shell 1 is cylindrical, and a wire outlet hole is formed in the side face of the circular ring; the inner cover plate 2 is fixed on the inner cylinder 12 and matched with the wire outlet hole. The fan 6 is disposed at one end of the inner barrel 12.
In this embodiment, the inner cover plate 2 and the shielding sleeve 8 can be made of stainless steel, and can shield the sensing piece and the signal processing circuit. In the conventional dust detection device, the housing is directly used as a shielding case, so that interference between detection signals is easily caused.
In this embodiment, the screw 3 is a cross recessed pan head screw.
As shown in fig. 4, the detection method of the charge-induced dust concentration detection apparatus in this embodiment is as follows:
step S1: induction sheets I-III (9-11) are used as electrostatic detection electrodes, dust particles in the environment pass through a detection area under the action of a fan 6, and the dust particles in the detection area induce changed induction charges on the surface of the detection electrodes, namely, 3 induction signals are induced to be x1、x2、x3(sampling frequency 2kHZ, 1024 data, x, respectively1＝{n1,n2,n3,...,n1024}，x2＝{m1,m2,m3,...,m1024}，x3＝{p1,p2,p3,...,p1024}) and 3 induction signal processing circuits connected with the rear ends of the induction sheets, and used for extracting, amplifying, filtering and AD converting each induction signal and outputting 3 signals s1、s2、s3Comprises the following steps:
wherein |. non chlorine1.5Representing the central moment of order 1.5.
Step S2: will s1And s2、s2And s3Performing cross-correlation operation to obtain the flow velocity v of the particles1、v2(ii) a For v1、v2And averaging to obtain the particle flow velocity V.
Step S3: combined with induction signal s1、s2、s3Determining an output detection value by a function f
Wherein
Step S4: by temperature and humidity transmissionThe sensor obtains the temperature T and the humidity H of the environment, and the particle concentration value is calculated by combining the particle flow velocity V and the detection value S
And k is the influence coefficient of the flow velocity of the particulate matters on the detection result of the dust concentration, and w is the influence coefficient of the temperature and the humidity of the particulate matters on the detection result of the dust.
Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.
Claims (9)
1. A charge induction method dust concentration detection device with strong anti-interference capability comprises a shell (1) and an inner cylinder (12), and is characterized by further comprising an inner cover plate (2) arranged between the inner cylinder (12) and the shell (1), a signal processing circuit (4), a temperature and humidity sensor (5), induction pieces I-III (9-11) and a shielding sleeve (8);
the induction sheets I to III (9 to 11) are embedded in the inner wall of the inner cylinder (12); the shielding sleeve (8) is arranged between the inner wall and the outer wall of the inner cylinder (12) and covers the induction sheet; the signal processing circuit (4) is arranged on the outer wall of the inner barrel (12); the temperature and humidity sensor (5) is arranged on the wall of the inner cylinder (12) and is used for collecting the dust environment temperature passing through the hollow part of the inner cylinder; the inner cover plate (2) covers the signal processing circuit (4) and the temperature and humidity sensor (5); the shielding sleeve (8) and the inner cover plate (2) are both connected with the negative electrode of the temperature and humidity sensor (5);
and the signal processing circuit (4) is respectively connected with the sensing sheet and the temperature and humidity sensor (5) and is used for processing and analyzing the collected electric dust signals and the temperature and humidity information of the environment.
2. The charge induction type dust concentration detection device according to claim 1, further comprising a fan (6) disposed at one end of the inner cylinder (12).
3. The charge induction method dust concentration detection device according to claim 1, wherein the housing (1) is a rectangular cylinder, and a wire outlet is formed in a side surface of the cylinder; the inner cover plate (2) is fixed on the inner cylinder (12) and matched with the wire outlet hole.
4. The charge induction method dust concentration detection device according to claim 1, characterized in that an alarm is further arranged between the inner cylinder (12) and the outer shell (1) and used for alarming that the dust concentration exceeds the standard.
5. The charge induction method dust concentration detection device according to any one of claims 1 to 4, wherein the inner cover plate (2) and the shielding sleeve (8) are made of metal materials.
6. The charge induction method dust concentration detection device according to any one of claims 1 to 4, characterized in that the detection method of the device specifically comprises the following steps:
s1: the sensing pieces I-III (9-11) are used as electrostatic detection electrodes, dust particles in the environment pass through a detection area under the action of a fan (6), the dust particles passing through the detection area induce changed induction charges on the surface of the detection electrodes, 3 induction signal processing circuits are connected to the rear ends of the sensing pieces, each induction signal is extracted, amplified, filtered and AD converted, and 3 signals x are output1、x2、x3；
S2: x is to be1And sx2、x2And x3Obtaining the flow velocity v of the particles through cross-correlation operation1、v2(ii) a For v1、v2Averaging to obtain a particulate matter flow velocity V;
s3: x is to be1、x2、x3Obtaining S1, S2 and S3 through 1.5-order central moment processing, and determining an output detection value S-f (S) through a function f1、s2、s3)；
S4: and obtaining the temperature T and the humidity H of the environment through a temperature and humidity sensor, and calculating to obtain a particulate matter concentration value C by combining the particulate matter flow velocity V and the detection value S.
7. The dust concentration detecting apparatus using charge induction method according to claim 6, wherein in step S1, the sensing pieces I-III as electrostatic detecting electrodes induce 3 sensing signals x1、x2、x3The sampling frequency is 2kHZ, and 1024 pieces of data are acquired, namely:
x1＝{n1,n2,n3,...,n1024}
x2＝{m1,m2,m3,...,m1024}
x3＝{p1,p2,p3,...,p1024}
x1、x2、x3after 1.5-order central moment processing, processing results s1, s2 and s3 of 3 groups of signals are obtained:
8. the charge induction type dust concentration detection apparatus according to claim 7, wherein in step S3, the calculation formula of the detection value S is:
wherein the content of the first and second substances,
9. the charge induction type dust concentration detection apparatus according to claim 8, wherein in step S4, the calculation formula of the particulate matter concentration value C is:
and k is the influence coefficient of the flow velocity of the particulate matters on the detection result of the dust concentration, and w is the influence coefficient of the temperature and the humidity of the particulate matters on the detection result of the dust.
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