CN217237655U - Aerosol Faraday cup device and device for detecting surface charge amount of aerosol - Google Patents
Aerosol Faraday cup device and device for detecting surface charge amount of aerosol Download PDFInfo
- Publication number
- CN217237655U CN217237655U CN202123131343.6U CN202123131343U CN217237655U CN 217237655 U CN217237655 U CN 217237655U CN 202123131343 U CN202123131343 U CN 202123131343U CN 217237655 U CN217237655 U CN 217237655U
- Authority
- CN
- China
- Prior art keywords
- aerosol
- insulating
- faraday cup
- shell
- terminal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
Abstract
The utility model relates to an aerosol Faraday cup device and a device for detecting the surface charge amount of aerosol, wherein the Faraday cup device comprises a Faraday cup and an outer insulating shell, the Faraday cup is provided with an aerosol outlet, an insulator is arranged between the Faraday cup and the outer insulating shell, and the outer insulating shell and the insulator are provided with an aerosol inlet; the device for detecting the electric charge amount comprises an electrometer, a flowmeter, a vacuum pump and a controller, wherein the electrometer is electrically connected with a probe of the aerosol Faraday cup device, an aerosol outlet of the aerosol Faraday cup device is sequentially connected with the flowmeter and the vacuum pump through pipelines, and the electrometer, the flowmeter and the vacuum pump are electrically connected with the controller. And an insulator is added between the inner shielding shell and the outer shielding shell, so that the electromagnetic interference and the temperature interference caused by the external environment on the Faraday cup and the influences of capacitive coupling, leakage current, system noise and the like caused by electrical elements are reduced.
Description
Technical Field
The utility model relates to an aerosol electrometer technical field specifically is an aerosol faraday cup device and detect device of aerosol surface charge volume.
Background
The aerosol electrometer is a main instrument for measuring the quantity and concentration of the aerosol, and has the technical advantages that the measurement result of the instrument can be traced to the current, the particle counting efficiency in different particle size ranges is constant, and the like, so that the aerosol electrometer becomes the internationally recognized highest standard of particle counting (quantity and concentration). The measurement results of aerosol concentration measuring instruments such as condensation nucleus particle counters, dust particle counters and the like need to be traced to the aerosol electrometer. The existing aerosol concentration measuring instrument mainly adopts a Faraday cup structure, but the outside of the existing Faraday cup device is only provided with a layer of shielding shell, when the current measuring instrument is actually used, the current collected by an electrometer is in an unsafe level and is seriously influenced by interference of temperature, electromagnetism and the like, if the shielding is not in place, the current collection is difficult to realize, and the real-time detection of the surface charge quantity of the aerosol can not be realized. In order to shield in place, the existing method is to cover a shielding box outside the faraday cup device, so that the faraday cup device occupies a larger space and is inconvenient to use.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an aerosol Faraday cup device and detect device of aerosol surface charge volume solves current aerosol concentration measurement instrument simple structure, and the shielding is not thorough, is difficult to realize the problem of tracing to the source.
The utility model provides an aerosol Faraday cup device, including Faraday cup, outer insulating shell, Faraday cup has the aerosol export, be equipped with the insulator between Faraday cup and the outer insulating shell, open the aerosol entry on outer insulating shell and the insulator.
Preferably, the faraday cup comprises an inner insulation shell, a high efficiency filter, a probe, a first insulation terminal and a second insulation terminal, the high efficiency filter is arranged inside the inner insulation shell, one end of the high efficiency filter is connected with the probe, the other end of the high efficiency filter is connected with one end of the first insulation terminal, the second insulation terminal is fixed on the outer insulation shell and the insulator, the probe penetrates through the inner insulation shell and is fixed in the second insulation terminal, and the other end of the first insulation terminal penetrates through the insulator and the outer insulation shell.
Preferably, the insulator includes an insulating support, a first insulating end cover, and a second insulating end cover, two ends of the insulating support are respectively and fixedly connected to the first insulating end cover and the second insulating end cover, the second insulating terminal is fixed to the first insulating end cover, and the first insulating terminal passes through the second insulating end cover.
Preferably, the outer insulating shell comprises a shell and an end cap fixedly connected with the shell, and the first insulating terminal penetrates through the end cap.
Preferably, the aerosol inlet is connected to an aerosol nozzle.
Preferably, the high-efficiency filter can be made of metal materials or glass fiber materials.
The utility model also provides a detect device of aerosol surface charge volume, including electrometer, flowmeter, vacuum pump, controller, the probe of aerosol Faraday cup device is connected to the electrometer electricity, the aerosol export of aerosol Faraday cup device connects gradually flowmeter and vacuum pump through the pipeline, electrometer, flowmeter and the equal electric connection director of vacuum pump.
Compared with the prior art, the beneficial effects of the utility model are that:
1. and an insulator is added between the inner shielding shell and the outer shielding shell, so that the electromagnetic interference and the temperature interference caused by the external environment on the Faraday cup and the influences of capacitive coupling, leakage current, system noise and the like caused by electrical elements are reduced.
2. The flow detection error of the flow meter is less than 0.1%, and the flow fluctuation range of the vacuum pump is less than 0.5%.
3. High efficiency filter and first insulation terminal can adopt integrative structure, and whole device's compact structure need not plus shielding case again, and it is more convenient to use. The high-efficiency filter is preferably made of metal, compared with glass fiber.
Drawings
FIG. 1 is an exploded view of an aerosol Faraday cup apparatus of the present invention;
fig. 2 is a schematic diagram of the device for detecting surface charge amount of aerosol according to the present invention.
The figure is marked with: the faraday cup 1, the outer insulation shell 2, the insulator 3, the aerosol inlet 4, the aerosol nozzle 5, the aerosol outlet 11, the inner insulation shell 12, the high-efficiency filter 13, the probe 14, the first insulation terminal 15, the second insulation terminal 16, the shell 21, the end cover 22, the insulation support 31, the first insulation end cover 32 and the second insulation end cover 33.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts all belong to the protection scope of the present invention.
Examples
Referring to fig. 1 and 2, the aerosol faraday cup device provided in the present embodiment includes a faraday cup 1 and an outer insulating shell 2, where the faraday cup 1 has an aerosol outlet 11, an insulator 3 is disposed between the faraday cup 1 and the outer insulating shell 2, and an aerosol inlet 4 is opened on the outer insulating shell 2 and the insulator 3. The insulator 3 can enhance the shielding effect of the device on electromagnetic interference and temperature interference, and avoid the influence of electromagnetic interference and temperature interference due to over-small current value when tracing to form current. As can be seen from fig. 2, the axes of the aerosol inlet 4 and the aerosol outlet 11 of the present embodiment are perpendicular. Of course, the position of the aerosol inlet 4 is not fixed, and may be arranged coaxially with the aerosol outlet 11.
As a preferred embodiment of the present embodiment, the faraday cup 1 includes an inner insulating shell 12, a high-efficiency filter 13, a probe 14, a first insulating terminal 15 and a second insulating terminal 16, the high-efficiency filter 13 is disposed inside the inner insulating shell 12, a gap is formed between the high-efficiency filter 13 and the inner insulating shell 12 for the circulation of aerosol, one end of the high-efficiency filter 13 is connected to the probe 14, and the other end is connected to one end of the first insulating terminal 15, the high-efficiency filter 13 and the first insulating terminal 15 are communicated, the charged aerosol entering the faraday cup 1 from the aerosol inlet 4 is collected on the surface of the high-efficiency filter, filtered by the high-efficiency filter and then discharged from the first insulating terminal 15, the aerosol outlet 11 is an air outlet of the first insulating terminal 15, the second insulating terminal 16 is fixed on the outer insulating shell 2 and the insulating body 3, the probe 14 is fixed in the second insulated terminal 16 through the inner insulated shell 12, and the other end of the first insulated terminal 15 passes through the insulator 3 and the outer insulated shell 2.
As a preferred embodiment of the present embodiment, the insulator 3 includes an insulating support 31, a first insulating end cap 32, and a second insulating end cap 33, two ends of the insulating support 31 are fixedly connected to the first insulating end cap 32 and the second insulating end cap 33, respectively, as can be seen from fig. 1, holes are formed on both the first insulating end cap 32 and the second insulating end cap 33, and holes are also formed on the insulating support 31, so that the insulating support 31 of the present embodiment is connected to the first insulating end cap 32 and the second insulating end cap 33 by screws. In this embodiment, the second insulating end cap 33 and the side wall of the outer insulating shell 2 are both provided with holes as aerosol inlets 4. The second insulated terminal 16 is fixed to the first insulated terminal cap 32, and the first insulated terminal 15 passes through the second insulated terminal cap 33. The high efficiency filter 13 and the first insulating terminal 15 of the present embodiment are integrally formed, the first insulating terminal 15 is externally threaded, the second insulating end cap 33 is internally threaded, and the first insulating terminal 15 is screwed on the second insulating end cap 33.
As a preferred embodiment of this embodiment, the outer insulating shell 2 includes a shell 21 and an end cap 22 fixedly connected to the shell 21, and the end cap 22 is provided with a hole and can be connected to the second insulating end cap 33 by a screw. The first insulating terminal 15 passes through the end cap 22.
As a preferred embodiment of this embodiment, the aerosol inlet 4 is connected to an aerosol nozzle 5, and the aerosol nozzle 5 is also connected to the second insulating end cap 33 by a screw thread.
As a preferred embodiment of this embodiment, the high efficiency filter 13 may be made of metal or glass fiber.
Referring to fig. 2, the embodiment further provides a device for detecting the surface charge amount of aerosol, which includes an electrometer, a flow meter, a vacuum pump, and a controller, wherein the electrometer is electrically connected to a probe 14 of the aerosol faraday cup device, an aerosol outlet 4 of the aerosol faraday cup device is sequentially connected to the flow meter and the vacuum pump through a pipeline, an electromagnetic valve may be further disposed on the pipeline between the flow meter and the vacuum pump, and the electrometer, the flow meter, and the vacuum pump are all electrically connected to the controller.
The vacuum pump provides negative pressure required by aerosol flow, and preferably a constant-flow vacuum pump with a sampling flow rate of 2-10L/min and a flow fluctuation range of less than 0.5% in 8 flow intervals of 2-3L/min, 3-4L/min, 4-5L/min, 5-6L/min, 6-7L/min, 7-8L/min, 8-9L/min and 9-10L/min. The feedback time of the flowmeter is 1ms, and the flow detection error is less than 0.1%.
The high-efficiency filter 13 is connected with an electrometer, and the electrometer is grounded with the outer insulating shell 2. In the detection process, if the charge of the aerosol particles is positive charge, a potential difference is formed between the grounding end of the electrometer and the high-efficiency filter 13, electrons move from the grounding end of the electrometer to the high-efficiency filter 13 and neutralize the particles captured by the high-efficiency filter 13, the current measured by the electrometer is the corresponding current formed by the charge of the aerosol particles in the Faraday cup, and the current direction is from the high-efficiency filter 13 to the electrometer. When the aerosol particles are negatively charged, a potential difference is also formed between the grounding end of the electrometer and the high-efficiency filter 13, and a response current is formed, wherein the current direction is from the electrometer to the high-efficiency filter 13. The current intensity measured at the electrometer is proportional to the charge collection rate on the high efficiency filter 13.
The response current is related to the aerosol particle number concentration as follows:
I＝N*e*qe
qe＝Q*t
wherein I is response current value, unit A, N is aerosol particle number concentration, and e is basic unit of charge, i.e. e is 1.6 x 10 -19 Coulomb, qe is the volume of aerosol entering the device. Q is the aerosol flow and t is the test time. The aerosol particle number concentration N can be calculated from the above equation.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. An aerosol Faraday cup device, comprising a Faraday cup and an outer insulating shell, wherein the Faraday cup is provided with an aerosol outlet, and the Faraday cup device is characterized in that: an insulator is arranged between the Faraday cup and the outer-layer insulating shell, and an aerosol inlet is formed in the outer-layer insulating shell and the insulator; the Faraday cup comprises an inner-layer insulating shell, a high-efficiency filter, a probe, a first insulating terminal and a second insulating terminal, wherein the high-efficiency filter is arranged inside the inner-layer insulating shell, one end of the high-efficiency filter is connected with the probe, the other end of the high-efficiency filter is connected with one end of the first insulating terminal, the second insulating terminal is fixed on an outer-layer insulating shell and an insulator, the probe penetrates through the inner-layer insulating shell and is fixed in the second insulating terminal, and the other end of the first insulating terminal penetrates through the insulator and the outer-layer insulating shell.
2. The aerosol faraday cup apparatus of claim 1, wherein: the insulator comprises an insulating support, a first insulating end cover and a second insulating end cover, two ends of the insulating support are fixedly connected with the first insulating end cover and the second insulating end cover respectively, the second insulating terminal is fixed on the first insulating end cover, and the first insulating terminal penetrates through the second insulating end cover.
3. The aerosol faraday cup apparatus of claim 1, wherein: the outer insulating shell comprises a shell body and an end cover fixedly connected with the shell body, and the first insulating terminal penetrates through the end cover.
4. The aerosol faraday cup apparatus of claim 1, wherein: the aerosol inlet is connected with the aerosol nozzle.
5. The aerosol faraday cup apparatus of claim 1, wherein: the high-efficiency filter can be made of metal materials or glass fiber materials.
6. An apparatus for detecting surface charge of an aerosol using an aerosol faraday cup apparatus of any of claims 1 to 5, wherein: including electrometer, flowmeter, vacuum pump, controller, the probe of aerosol Faraday cup device is connected to the electrometer electricity, flowmeter and vacuum pump are connected gradually through the pipeline to the aerosol export of aerosol Faraday cup device, electrometer, flowmeter and the equal electric connection director of vacuum pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123131343.6U CN217237655U (en) | 2021-12-14 | 2021-12-14 | Aerosol Faraday cup device and device for detecting surface charge amount of aerosol |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123131343.6U CN217237655U (en) | 2021-12-14 | 2021-12-14 | Aerosol Faraday cup device and device for detecting surface charge amount of aerosol |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217237655U true CN217237655U (en) | 2022-08-19 |
Family
ID=82825772
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123131343.6U Active CN217237655U (en) | 2021-12-14 | 2021-12-14 | Aerosol Faraday cup device and device for detecting surface charge amount of aerosol |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217237655U (en) |
-
2021
- 2021-12-14 CN CN202123131343.6U patent/CN217237655U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US9606038B2 (en) | Particle count measurement device | |
| US5214386A (en) | Apparatus and method for measuring particles in polydispersed systems and particle concentrations of monodispersed aerosols | |
| US20150102228A1 (en) | Method and device for measuring radon by electrostatic collection method without influence of environmental temperature and environmental humidity | |
| CN103257356B (en) | Tritium concentration measurement mechanism in airtight container | |
| WO2015176551A1 (en) | Method and device for improving detection sensitivity of static collecting method emanometer | |
| CN108680764A (en) | Gas velocity measurement device based on ionic trace and its measurement method | |
| CN106769707A (en) | A kind of adjustable particle size spectrometry device of potential well voltage and its measuring method | |
| CN109283440B (en) | Negative pressure type simulation test analysis platform with controllable environmental conditions | |
| Zhang et al. | Prediction of average mobility of ions from corona discharge in air with respect to pressure, humidity and temperature | |
| CN109187289A (en) | A kind of aerosol electromobility partial size spectral measurement system and method | |
| CN109655857B (en) | Measuring instrument pair for improving radon exhalation rate by annular electrode218Measuring cavity and method for Po collection efficiency | |
| CN217237655U (en) | Aerosol Faraday cup device and device for detecting surface charge amount of aerosol | |
| CN109254314B (en) | With ring electrodes increasing positive charge218Po collection efficiency measurement cavity and method | |
| CN108152694A (en) | A kind of GIS disc insulators detection method for local discharge | |
| CN207336489U (en) | A kind of air ion detector of enclosed one-way gas flow road structure | |
| CN108120946A (en) | A kind of direct current synthesis field tester calibration device and its application process | |
| Zhang et al. | Experimental investigation on humidity effects on the variations of positive DC corona discharge | |
| CN209264968U (en) | A kind of flow-type ionization chamber measuring tritium gas | |
| CN207717960U (en) | A kind of direct current synthesis field tester calibration device | |
| CN209117657U (en) | A kind of oil smoke on-line computing model | |
| CN109655859B (en) | Measuring instrument pair with multiple detectors for improving radon exhalation rate 218 Po collection efficiency measurement cavity and method | |
| CN104391192B (en) | The capacitance-type fuel quantity measuring method and system of a kind of electromagnetism interference | |
| Intra et al. | Measurements of ion current from a corona-needle charger using a Faraday cup electrometer | |
| CN109655858B (en) | Multi-electrode measuring instrument pair for improving radon exhalation rate 218 Po collection efficiency measurement cavity and method | |
| CN205301416U (en) | Sensitive voltage detector for power maintenance |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |