CN210392926U - Device for measuring static electricity in real time and pneumatic transmission experimental system - Google Patents
Device for measuring static electricity in real time and pneumatic transmission experimental system Download PDFInfo
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- CN210392926U CN210392926U CN201920840619.1U CN201920840619U CN210392926U CN 210392926 U CN210392926 U CN 210392926U CN 201920840619 U CN201920840619 U CN 201920840619U CN 210392926 U CN210392926 U CN 210392926U
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Abstract
The utility model relates to a device for measuring static in real time and pneumatic transmission experiment system, the device for measuring static in real time comprises a measuring pipe section, the measuring pipe section comprises an inner pipe, the inner cavity of the inner pipe forms a transmission channel for conveying particles, a film unit is laid on the outer wall of the inner pipe, a conductive adhesive unit is laid on the outer wall of the film unit, a first copper electrode sleeve is sleeved on the outer wall of the conductive adhesive unit, an insulating adhesive unit is laid on the outer wall of the first copper electrode sleeve, and a second copper electrode sleeve is sleeved on the outer wall of the insulating adhesive unit; the inner tube, the first copper electrode sleeve and the second copper electrode sleeve are coaxially arranged, and the first copper electrode sleeve, the insulating glue unit and the second copper electrode sleeve form a guide system. The utility model discloses a can carry out real-time on-line measuring to the induced-current that the friction produced among the pneumatic conveying process, measuring precision is high, has improved the stability of measuring process induced-current.
Description
Technical Field
The utility model relates to a pneumatic transmission technical field especially relates to a device and pneumatic transmission experimental system of real-time measurement static.
Background
The pneumatic conveying experiment system is widely applied to the industries of energy, chemical industry, pharmacy and the like and the transportation of particle materials in material processing. In a pneumatic conveying experiment system, due to collision and friction between different material surfaces, particles and the wall surface of a system pipeline tend to acquire electrostatic charges. The accumulation of charge on system components is accompanied by the risk of discharge of the charge at any time, while the presence of static electricity in the system seriously affects the efficiency of particulate matter transport. Therefore, it is important to measure the amount of static electricity in the pipe accurately in real time. The known static measurement method is greatly influenced by various environmental conditions, the reproducibility of measurement results is poor, and the total requirements of the measurement instruments are that the input impedance is high, the input capacitance is small, a test connecting line needs to be grounded, and the insulation resistance is high.
Therefore, the inventor provides a device for measuring static electricity in real time and a pneumatic transmission experimental system by virtue of experience and practice of related industries for many years, so as to overcome the defects in the prior art.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a device and pneumatic conveyor experimental system of real-time measurement static, this utility model can carry out real-time on-line measurement to the induced-current that the friction produced among the pneumatic conveyor process, and measuring precision is high, has improved the stability of measurement process induced-current.
The utility model aims at realizing the device for measuring static in real time, which comprises a measuring pipe section, wherein the inlet of the measuring pipe section is communicated with the outlet of a gas-solid rotary valve in a pneumatic conveying experiment system, the measuring pipe section is electrically connected with an electrostatic instrument, the electrostatic instrument is used for measuring the induced current of the measuring pipe section, and the electrostatic instrument is electrically connected with a computer; the outlet of the measuring pipe section is communicated with a Faraday cup which is electrically connected with the computer and is used for measuring the particle charge; the measuring pipe section, the electrostatic instrument and the Faraday cup are all grounded;
the measuring pipe section comprises an inner pipe, an inner cavity of the inner pipe forms a transmission channel for conveying particles, a film unit is laid on the outer wall of the inner pipe, a conductive adhesive unit is laid on the outer wall of the film unit, a first copper electrode sleeve is sleeved on the outer wall of the conductive adhesive unit, an insulating adhesive unit is laid on the outer wall of the first copper electrode sleeve, and a second copper electrode sleeve is sleeved on the outer wall of the insulating adhesive unit; the inner tube, the first copper electrode sleeve and the second copper electrode sleeve are coaxially arranged, and the first copper electrode sleeve, the insulating glue unit and the second copper electrode sleeve form a guide system;
the first copper electrode sleeve is electrically connected with a first lead, and the other end of the first lead is electrically connected with the high potential of the electrostatic instrument; the second copper electrode sleeve is electrically connected with a second lead, and the other end of the second lead is electrically connected with a low potential of the electrostatic instrument; and the low potential of the electrostatic instrument is electrically connected with the grounding jack through a third lead.
In a preferred embodiment of the present invention, the inner tube is a pvc pipe, and the film unit is a polyethylene film that can be attached to an outer wall of the pvc pipe.
In a preferred embodiment of the present invention, the conductive adhesive unit is silver-plated copper powder filled conductive adhesive.
The purpose of the utility model can be realized in such a way that a pneumatic conveying experiment system comprises a feeding part and an air inlet part, wherein the feeding part is used for filling conveying particles, the feeding part and the air inlet part are both connected to a gas-solid rotary valve, the outlet of the gas-solid rotary valve is connected with the device for measuring static electricity in real time, the device for measuring static electricity in real time comprises a measuring pipe section, the inlet of the measuring pipe section is communicated with the outlet of the gas-solid rotary valve, and the measuring pipe section is electrically connected with an electrostatic instrument; an outlet of the measuring pipe section is communicated with a Faraday cup, and an outlet of the Faraday cup is communicated with a metal container capable of collecting and conveying particles; the feed portion, the measurement tube segment, the static meter, the faraday cup, and the metal container are all grounded.
The utility model discloses an in a preferred embodiment, the feeder hopper that the feed portion includes ground connection and handles, the export of feeder hopper is through feeding control valve intercommunication the gas-solid rotary valve.
In a preferred embodiment of the present invention, the feeding hopper is connected with an electronic weighing device.
The utility model discloses an in a preferred embodiment, the portion of admitting air includes the airflow control valve, the export intercommunication air flow dryer of airflow control valve, the export intercommunication of air flow dryer sets up the rotameter that can monitor air mass flow, rotameter's export intercommunication the gas-solid rotary valve.
From above, the utility model provides a device and pneumatic transmission experimental system of real-time measurement static has following beneficial effect:
in the device for measuring static in real time provided by the utility model, the induced current in the pneumatic transmission process is measured on line by adopting the coaxial line principle; the measuring pipe section is of an annular covering and wrapping structure and is composed of five layers of materials, the materials of all layers are tightly attached to each other, the surface is smooth, and the influence of induced current backflow generated by electromagnetic waves on the measurement precision of induced current is greatly reduced; the first copper electrode sleeve, the insulating glue unit and the second copper electrode sleeve which are arranged according to the principle of a coaxial line form a guide system; the electromagnetic field is limited between the first copper electrode sleeve and the second copper electrode sleeve, and the coaxial line basically has no radiation loss and is hardly interfered by external signals; the first copper electrode sleeve and the second copper electrode sleeve are continuously conductive, so that the collection work of induced current is well completed in the measuring pipe section; the second copper electrode sleeve is grounded through the electrostatic instrument, so that the electromagnetic shielding effect is achieved, the whole device is high in anti-interference capacity and good in shielding performance, a stable electromagnetic field is maintained inside the device all the time, induced current transmission is more stable, and the measurement accuracy is improved; the conductive adhesive unit adopts silver-plated copper powder filled conductive adhesive, so that the stability is improved;
the utility model provides a pneumatic conveying experimental system has adopted the device of real-time measurement static, can carry out real-time on-line measurement to the induced-current that the friction produced among the pneumatic conveying process, and measuring precision is high, has improved the stability of measuring process induced-current.
Drawings
The drawings are only intended to illustrate and explain the present invention and do not limit the scope of the invention. Wherein:
FIG. 1: do the utility model discloses a pneumatic conveying experimental system's schematic diagram.
FIG. 2: is the schematic view of the measuring pipe section of the utility model.
In the figure:
100. a pneumatic conveying experiment system;
1. a means for measuring static electricity in real time;
11. measuring a pipe section;
111. an inner tube; 112. a thin film unit; 113. a conductive paste unit; 114. a first copper electrode sheath; 115. an insulating glue unit; 116. a second copper electrode sheath;
12. an electrostatic instrument;
13. a computer;
14. a Faraday cup;
2. a gas-solid rotary valve;
3. a feeding section; 31. a feed hopper; 32. a feed control valve; 33. an electronic weigher;
4. an air intake portion; 41. an airflow control valve; 42. an air flow dryer; 43. a rotameter;
5. a metal container.
Detailed Description
In order to clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will be described with reference to the accompanying drawings.
The specific embodiments of the present invention described herein are for the purpose of explanation only and should not be construed as limiting the invention in any way. Given the teachings of the present invention, the skilled person can conceive of any possible variants based on the invention, which should all be considered as belonging to the scope of the invention. It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "mounted," "connected," and "connected" are to be construed broadly and may include, for example, mechanical or electrical connections, communications between two elements, direct connections, indirect connections through intermediaries, and the like. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
As shown in fig. 1, the present invention provides a device 1 for measuring static electricity in real time, which comprises a measuring pipe section 11, wherein an inlet of the measuring pipe section 11 is communicated with an outlet of a gas-solid rotary valve 2 in a pneumatic conveying experiment system 100, the measuring pipe section 11 is electrically connected with a static electricity meter 12, the static electricity meter 12 is used for measuring induced current of the measuring pipe section 11, and the static electricity meter 12 is electrically connected with a computer 13; the outlet of the measuring pipe section 11 is communicated with a Faraday cup 14 which is electrically connected with the computer 13, and the Faraday cup 14 is used for measuring the particle charge; the measuring pipe section 11, the electrostatic instrument 12 and the Faraday cup 14 are all grounded;
as shown in fig. 2, the measurement pipe segment 11 includes an inner pipe 111, an inner cavity of the inner pipe 111 forms a transmission channel for conveying particles, a film unit 112 is laid on an outer wall of the inner pipe 111, a conductive adhesive unit 113 is laid on an outer wall of the film unit 112, a first copper electrode sleeve 114 is sleeved on an outer wall of the conductive adhesive unit 113, an insulating adhesive unit 115 is laid on an outer wall of the first copper electrode sleeve 114, and a second copper electrode sleeve 116 is sleeved on an outer wall of the insulating adhesive unit 115; in a specific embodiment of the present invention, the wall thickness of the inner tube 111 is 5mm, and the thickness of the thin film unit 112 is 0.04 mm; the thickness of the conductive adhesive unit 113 is 0.07 mm; the wall thickness of the first copper electrode sheath 114 is 0.10 mm; the thickness of the insulating glue unit 115 is 0.12 mm; the wall thickness of the second copper electrode sheath 116 was 0.10 mm. The units of each layer are tightly attached and have smooth surfaces, so that the influence of induced current backflow generated by electromagnetic waves on the measurement accuracy of induced current is greatly reduced.
As shown in fig. 2, the inner tube 111, the first copper electrode sheath 114 and the second copper electrode sheath 116 are coaxially disposed, and the first copper electrode sheath 114, the insulating glue unit 115 and the second copper electrode sheath 116 form a guidance system; the electromagnetic field is limited between the first copper electrode sleeve 114 and the second copper electrode sleeve 116, and the coaxial line has basically no radiation loss and is hardly interfered by external signals; the first copper electrode sleeve 114 and the second copper electrode sleeve 116 are both continuously conductive, so that the collection of the induced current is well completed in the measuring pipe section 11; the second copper electrode sleeve 116 is grounded through the electrostatic instrument 12, so that the electromagnetic shielding effect is achieved, the whole device is high in anti-interference capacity and good in shielding performance, a stable electromagnetic field is maintained inside the device all the time, induced current transmission is more stable, and the measurement accuracy is improved.
The first copper electrode sleeve 114 is electrically connected with a first lead, and the other end of the first lead is electrically connected with the high potential of the electrostatic instrument 12; the second copper electrode sleeve 116 is electrically connected with a second lead, and the other end of the second lead is electrically connected with the low potential of the electrostatic instrument 12; the low potential of the static electricity meter 12 is electrically connected to the ground jack through a third wire.
In this embodiment, the first lead and the second lead are respectively welded to the first copper electrode sheath 114 and the second copper electrode sheath 116, and the welded portion is sanded and then cleaned with warm water so as to prevent the welding agent from corroding and oxidizing the welded portion; after cleaning, drying, then carrying out anti-oxidation treatment on the welding part, and carrying out passivation protection treatment on the welding part in an antioxidant MS0423 for about 5 minutes; treating the passivated welding part with warm water to remove residual liquid medicine on the surface, and drying; in engineering practice, welding parts are most easily oxidized by air, so that measurement errors are increased, even the device fails, the anti-oxidation treatment is carried out, the normal working period of the device is longer, and the measurement accuracy is guaranteed.
The insulating paste unit 115 insulates the first and second copper electrode sleeves 114 and 116 and ensures a uniform distance between the two electrodes (the first and second copper electrode sleeves 114 and 116).
In the device for measuring static in real time provided by the utility model, the induced current in the pneumatic transmission process is measured on line by adopting the coaxial line principle; the measuring pipe section is of an annular covering and wrapping structure and is composed of five layers of materials, the materials of all layers are tightly attached to each other, the surface is smooth, and the influence of induced current backflow generated by electromagnetic waves on the measurement precision of induced current is greatly reduced; the first copper electrode sleeve, the insulating glue unit and the second copper electrode sleeve which are arranged according to the principle of a coaxial line form a guide system; the electromagnetic field is limited between the first copper electrode sleeve and the second copper electrode sleeve, and the coaxial line basically has no radiation loss and is hardly interfered by external signals; the first copper electrode sleeve and the second copper electrode sleeve are continuously conductive, so that the collection work of induced current is well completed in the measuring pipe section; the second copper electrode sleeve is grounded through the electrostatic instrument, so that the electromagnetic shielding effect is achieved, the whole device is high in anti-interference capacity and good in shielding performance, a stable electromagnetic field is maintained inside the device all the time, induced current transmission is more stable, and the measurement precision is improved.
Further, the inner pipe 111 is a polyvinyl chloride (PVC) pipe, and the film unit 112 is a Polyethylene (PE) film that can be attached to an outer wall of the PVC pipe.
Further, the conductive adhesive unit 113 is silver-plated copper powder filled conductive adhesive. Silver is the most suitable conductive filler compared with gold because it is cheap and has low resistance, however, under the condition of direct current potential, silver can generate electrolytic migration phenomenon to the surface of the glue layer, but silver-plated copper powder can not generate the condition, and the conductive glue unit adopts silver-plated copper powder filled type conductive glue to improve stability.
As shown in fig. 1, the utility model also provides a pneumatic conveying experimental system 100, including feed portion 3 and inlet port 4, feed portion 3 is used for filling and carries the granule, feed portion 3 and inlet port 4 all connect on gas-solid rotary valve 2, the export of gas-solid rotary valve 2 connects aforementioned device 1 of real-time measurement static, device 1 of real-time measurement static includes measuring pipe section 11, the entry of measuring pipe section 11 communicates with the export of gas-solid rotary valve 2, measuring pipe section 11 electricity connects static appearance 12; the outlet of the measuring pipe section 11 is communicated with a Faraday cup 14, and the outlet of the Faraday cup 14 is communicated with a metal container 5 capable of collecting and conveying particles; feed section 3, measurement spool piece 11, static meter 12, faraday cup 14, and metal container 5 are all processed grounded. Except that the inner pipe 111 of the measuring pipe section 11 is made of polyvinyl chloride (PVC) pipe, the conveying pipes among other parts are made of copper pipes.
The utility model provides a pneumatic conveying experimental system has adopted the device of real-time measurement static, can carry out real-time on-line measurement to the induced-current that the friction produced among the pneumatic conveying process, and measuring precision is high, has improved the stability of measuring process induced-current.
Further, as shown in fig. 1, the feeding section 3 includes a feed hopper 31 that is grounded, and an outlet of the feed hopper 31 is communicated with the gas-solid rotary valve 2 through a feed control valve 32.
As shown in fig. 1, in the present embodiment, an electronic scale 33 is connected to the hopper 31.
Further, as shown in fig. 1, the air inlet part 4 comprises an airflow control valve 41, an outlet of the airflow control valve 41 is communicated with an airflow dryer 42, an outlet of the airflow dryer 42 is communicated with a rotameter 43 capable of monitoring the air flow, and an outlet of the rotameter 43 is communicated with the gas-solid rotary valve 2.
The experimental method of the pneumatic transmission experimental system comprises the following steps:
step a, opening an airflow control valve 41, drying the compressed air through an airflow dryer 42, and monitoring the flow rate of the compressed air through a rotor flow meter 43;
b, when the flow rate of the compressed air (converted according to the flow calculation) reaches a set flow rate value (in a specific embodiment, the set flow rate value is 40m/s), opening the feed hopper 31, and controlling the conveyed particles through the electronic weighing device 33;
c, mixing the compressed air and the conveying particles in the gas-solid rotary valve 2 to form a gas-solid two-phase flow;
step d, when the gas-solid two-phase flow passes through the measuring pipe section 11, measuring induced current through the static electricity meter 12, and storing the induced current in the computer 13 at set time intervals (in a specific embodiment, the time intervals are 0.1 s);
e, the gas-solid two-phase flow passes through the Faraday cup 14 after passing through the measuring pipe section 11, and the Faraday cup 14 measures the particle charges and transmits the numerical value to the computer;
and f, collecting the conveyed particles to the metal container 5, and grounding to discharge after the conveying is finished.
The experimental method of the pneumatic conveying experimental system is simple, and the measurement precision of the induced current generated in the pneumatic conveying process is high.
From above, the utility model provides a device and pneumatic transmission experimental system of real-time measurement static has following beneficial effect:
in the device for measuring static in real time provided by the utility model, the induced current in the pneumatic transmission process is measured on line by adopting the coaxial line principle; the measuring pipe section is of an annular covering and wrapping structure and is composed of five layers of materials, the materials of all layers are tightly attached to each other, the surface is smooth, and the influence of induced current backflow generated by electromagnetic waves on the measurement precision of induced current is greatly reduced; the first copper electrode sleeve, the insulating glue unit and the second copper electrode sleeve which are arranged according to the principle of a coaxial line form a guide system; the electromagnetic field is limited between the first copper electrode sleeve and the second copper electrode sleeve, and the coaxial line basically has no radiation loss and is hardly interfered by external signals; the first copper electrode sleeve and the second copper electrode sleeve are continuously conductive, so that the collection work of induced current is well completed in the measuring pipe section; the second copper electrode sleeve is grounded through the electrostatic instrument, so that the electromagnetic shielding effect is achieved, the whole device is high in anti-interference capacity and good in shielding performance, a stable electromagnetic field is maintained inside the device all the time, induced current transmission is more stable, and the measurement accuracy is improved; the conductive adhesive unit adopts silver-plated copper powder filled conductive adhesive, so that the stability is improved;
the utility model provides a pneumatic conveying experimental system has adopted the device of real-time measurement static, can carry out real-time on-line measurement to the induced-current that the friction produced among the pneumatic conveying process, and measuring precision is high, has improved the stability of measuring process induced-current.
The above description is only exemplary of the present invention, and is not intended to limit the scope of the present invention. Any person skilled in the art should also realize that such equivalent changes and modifications can be made without departing from the spirit and principles of the present invention.
Claims (7)
1. The device for measuring static electricity in real time is characterized by comprising a measuring pipe section, wherein the inlet of the measuring pipe section is communicated with the outlet of a gas-solid rotary valve in a pneumatic conveying experiment system, the measuring pipe section is electrically connected with an electrostatic instrument, the electrostatic instrument is used for measuring induced current of the measuring pipe section, and the electrostatic instrument is electrically connected with a computer; the outlet of the measuring pipe section is communicated with a Faraday cup which is electrically connected with the computer and is used for measuring the particle charge; the measuring pipe section, the electrostatic instrument and the Faraday cup are all grounded;
the measuring pipe section comprises an inner pipe, an inner cavity of the inner pipe forms a transmission channel for conveying particles, a film unit is laid on the outer wall of the inner pipe, a conductive adhesive unit is laid on the outer wall of the film unit, a first copper electrode sleeve is sleeved on the outer wall of the conductive adhesive unit, an insulating adhesive unit is laid on the outer wall of the first copper electrode sleeve, and a second copper electrode sleeve is sleeved on the outer wall of the insulating adhesive unit; the inner tube, the first copper electrode sleeve and the second copper electrode sleeve are coaxially arranged, and the first copper electrode sleeve, the insulating glue unit and the second copper electrode sleeve form a guide system;
the first copper electrode sleeve is electrically connected with a first lead, and the other end of the first lead is electrically connected with the high potential of the electrostatic instrument; the second copper electrode sleeve is electrically connected with a second lead, and the other end of the second lead is electrically connected with a low potential of the electrostatic instrument; and the low potential of the electrostatic instrument is electrically connected with the grounding jack through a third lead.
2. The apparatus for measuring static electricity in real time according to claim 1, wherein the inner pipe is a polyvinyl chloride pipe, and the film unit is a polyethylene film that can be attached to an outer wall of the polyvinyl chloride pipe.
3. The apparatus for measuring static electricity in real time according to claim 1, wherein the conductive paste unit is silver-plated copper powder filled conductive paste.
4. A pneumatic conveying experimental system is characterized by comprising a feeding part and an air inlet part, wherein the feeding part is used for filling conveying particles, the feeding part and the air inlet part are both connected to a gas-solid rotary valve, an outlet of the gas-solid rotary valve is connected with the device for measuring static electricity in real time according to any one of claims 1 to 3, the device for measuring static electricity in real time comprises a measuring pipe section, an inlet of the measuring pipe section is communicated with an outlet of the gas-solid rotary valve, and the measuring pipe section is electrically connected with an electrostatic instrument; an outlet of the measuring pipe section is communicated with a Faraday cup, and an outlet of the Faraday cup is communicated with a metal container capable of collecting and conveying particles; the feed portion, the measurement tube segment, the static meter, the faraday cup, and the metal container are all grounded.
5. The pneumatic conveying experimental system as claimed in claim 4, wherein the feeding part comprises a feed hopper which is grounded, and an outlet of the feed hopper is communicated with the gas-solid rotary valve through a feed control valve.
6. The pneumatic conveying experiment system according to claim 5, wherein an electronic weigher is connected to the feed hopper.
7. The pneumatic conveying experimental system according to claim 6, wherein the air inlet portion comprises an airflow control valve, an outlet of the airflow control valve is communicated with an airflow dryer, an outlet of the airflow dryer is communicated with a rotameter capable of monitoring air flow, and an outlet of the rotameter is communicated with the gas-solid rotary valve.
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| CN201920840619.1U CN210392926U (en) | 2019-06-05 | 2019-06-05 | Device for measuring static electricity in real time and pneumatic transmission experimental system |
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| CN201920840619.1U CN210392926U (en) | 2019-06-05 | 2019-06-05 | Device for measuring static electricity in real time and pneumatic transmission experimental system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110194372A (en) * | 2019-06-05 | 2019-09-03 | 中国石油大学(北京) | Device, pneumatic conveying experimental system and the experimental method of real-time measurement electrostatic |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110194372A (en) * | 2019-06-05 | 2019-09-03 | 中国石油大学(北京) | Device, pneumatic conveying experimental system and the experimental method of real-time measurement electrostatic |
| CN110194372B (en) * | 2019-06-05 | 2023-12-29 | 中国石油大学(北京) | Device for measuring static electricity in real time, pneumatic conveying experiment system and experiment method |
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