CN109089369B - Device for eliminating electrostatic force interference - Google Patents
Device for eliminating electrostatic force interference Download PDFInfo
- Publication number
- CN109089369B CN109089369B CN201810765055.XA CN201810765055A CN109089369B CN 109089369 B CN109089369 B CN 109089369B CN 201810765055 A CN201810765055 A CN 201810765055A CN 109089369 B CN109089369 B CN 109089369B
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- wire
- relay
- electrostatic force
- tray
- thruster
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05F—STATIC ELECTRICITY; NATURALLY-OCCURRING ELECTRICITY
- H05F3/00—Carrying-off electrostatic charges
- H05F3/02—Carrying-off electrostatic charges by means of earthing connections
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/0028—Force sensors associated with force applying means
- G01L5/0038—Force sensors associated with force applying means applying a pushing force
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- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Plasma Technology (AREA)
- Elimination Of Static Electricity (AREA)
Abstract
The invention provides a device for eliminating electrostatic force interference, which comprises a wire set (2) and a relay (5); one end of a controlled circuit of the relay (5) is connected with one end of the wire group (2); one end of a control circuit of the relay (5) and the other end of the control circuit are both connected with one end of the wire group (2). The invention provides a device for eliminating electrostatic force interference, which also comprises a lead support (1); the lead support (1) is connected with the other end of the wire group (2); and the electric connectors of the lead wire support (1) are connected with a high-voltage power supply and a relay power supply through the connecting wires of the cabin wall. The device for eliminating electrostatic force interference provided by the invention eliminates the influence of electrostatic force of a high-voltage wire outside the high-precision balance through the wire group. The electrostatic force interference eliminating device provided by the invention adopts the reed switch to eliminate the electrostatic force of the wire connecting part of the thruster.
Description
Technical Field
The invention relates to a thrust measuring device, in particular to a device for eliminating electrostatic force interference, and particularly relates to a device for eliminating electrostatic force interference when thrust is measured.
Background
With the development of micro-power electric propulsion technology, a matched performance measurement technology is also researched, the thrust is one of important parameters of the performance of a thruster, and the size of the thrust determines the time required for changing the track under the same task. The thrust of the electric injection thruster is uN-mN level and is very small, and the measuring method thereof is generally divided into two main types: one is direct measurement, using newton's third law; the other is indirect measurement, which is derived by measuring flow and specific impulse separately.
The gravimetric method is one of the direct thrust measurements, in which the thruster is placed on a very precise balance (typically at least of the order of 0.1mg, i.e. 0.98 μ N is required) and the plume is ejected against the direction of gravitational acceleration. Neglecting the evaporation of the ionic liquid, when the thruster is not working, the scale reading (M)1) Comprises the following steps:
M1＝mT
in the formula, mTIs the thruster mass.
Assuming that the ejected liquid working substance falls onto the scale (in practice in a short time,
may be omitted). When the thruster is working, the scale number (M)2) Comprises the following steps:
in the formula (I), the compound is shown in the specification,
therefore, Δ T is the operating time and T is the thrust. Thus, a thrust force can be obtained:
T＝(M2-M1)g
in the formula:
t is the calculated thrust;
M1: scale indication when the thruster does not work;
M2: scale indication is carried out when the thruster works;
mT: an initial mass of the thruster;
g, gravity acceleration;
the electric spray propulsion is one of micropower propulsion technologies, the working voltage of the electric spray propulsion is high and reaches kilovolt level, and when the thrust is measured by adopting a gravity method, electrostatic force caused by high voltage can influence a high-precision balance, so that the measurement result is inaccurate, and therefore a device for eliminating interference of the electrostatic force between leads is urgently needed.
Disclosure of Invention
In view of the deficiencies in the prior art, it is an object of the present invention to provide a device for eliminating electrostatic force disturbances.
The device for eliminating electrostatic force interference comprises a wire set, a relay and a thruster;
one end of a controlled circuit of the relay is connected with one end of a first connecting wire of the wire group;
one end of the control circuit of the relay is connected with one end of the second connecting wire of the wire set;
the other end of the control circuit of the relay is connected with one end of a third connecting wire of the wire group;
the other end of the first connecting wire of the wire group is connected with one end of a high-voltage power supply;
the emitter of the thruster is connected with the other end of the controlled circuit of the relay;
the leading-out electrode of the thruster is connected with one end of a fourth connecting wire of the wire group;
the other end of the fourth connecting wire of the wire group is connected with the other end of the high-voltage power supply;
one end of the control circuit of the relay is connected with one end of the second connecting wire of the wire set;
the other end of the control circuit of the relay is connected with one end of a third connecting wire of the wire group;
the other end of the second connecting wire of the wire group is connected with the anode of the relay power supply;
and the negative electrode of the relay power supply is connected with the other end of the third connecting wire of the wire group.
Preferably, the wire guide device further comprises a wire support;
and the electric connectors of the lead support are connected with a high-voltage power supply and a relay power supply through the connecting wires of the cabin wall.
Preferably, a tray is also included;
the relay and the thruster are both arranged on the tray;
the bottom of the tray is provided with a connecting piece.
Preferably, the device further comprises a weighing module;
the weighing module is connected with the tray through a connecting piece.
Preferably, the material of the tray is an acrylic material.
Preferably, the material of the lead support is an acrylic material.
Preferably, the wire group is a copper wire.
Preferably, the relay adopts a reed switch relay.
Compared with the prior art, the invention has the following beneficial effects:
1. the device for eliminating electrostatic force interference provided by the invention eliminates the influence of electrostatic force of a high-voltage wire outside the high-precision balance through the wire group.
2. The electrostatic force interference eliminating device provided by the invention adopts the reed switch to eliminate the electrostatic force of the wire connecting part of the thruster.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
fig. 1 is a schematic structural diagram of an apparatus for eliminating electrostatic force interference according to the present invention.
Fig. 2 is a schematic diagram of a thruster and a working circuit of the thruster.
The reference numbers in the figures are shown in the following table:
| 1 |
| 2 |
| 3 |
| 4 weighing module |
| 5 Relay |
| 6 thruster |
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that it would be obvious to those skilled in the art that various changes and modifications can be made without departing from the spirit of the invention. All falling within the scope of the present invention.
The invention provides a device for eliminating electrostatic force interference, which comprises a wire group 2, a relay 5 and a thruster 6; one end of the controlled circuit of the relay 5 is connected with one end of the first connecting wire of the wire set 2; one end of the control circuit of the relay 5 is connected with one end of the second connecting wire of the wire set 2; the other end of the control circuit of the relay 5 is connected with one end of a third connecting wire of the wire group 2; the other end of the first connecting wire of the wire set 2 is connected with one end of a high-voltage power supply; the emitter of the thruster 6 is connected with the other end of the controlled circuit of the relay 5; the leading-out pole of the thruster 6 is connected with one end of a fourth connecting line of the line group 2; the other end of the fourth connecting wire of the wire set 2 is connected with the other end of the high-voltage power supply; one end of the control circuit of the relay is connected with one end of the second connecting wire of the wire set 2; the other end of the control circuit of the relay is connected with one end of a third connecting wire of the wire group 2; the other end of the second connecting wire of the wire group 2 is connected with the anode of the relay power supply; and the negative electrode of the relay power supply is connected with the other end of the third connecting wire of the wire group 2.
The invention provides a device for eliminating electrostatic force interference, which also comprises a lead support 1; and the electric connectors of the lead support 1 are connected with a high-voltage power supply and a relay power supply through the connecting wires of the cabin wall.
The invention provides a device for eliminating electrostatic force interference, which also comprises a tray 3; the relay 5 and the thruster 6 are both arranged on the tray 3; the bottom of the tray 3 is provided with a connecting piece.
The device for eliminating electrostatic force interference provided by the invention also comprises a weighing module 4; the weighing module 4 is connected with the tray 3 through a connecting piece.
The tray 3 is made of acrylic material. The lead support 1 is made of acrylic materials. The wire group 2 is a copper wire. The relay 5 adopts a reed switch relay.
The electrostatic force interference eliminating device provided by the invention is further explained as follows:
the device for eliminating electrostatic force interference, which is provided by the invention, is hereinafter referred to as an isolating device, and can eliminate the electrostatic force outside the balance and reduce the electrostatic force on the tray.
(1) And the influence of electrostatic force of a high-voltage wire outside the high-precision balance is eliminated by utilizing line group isolation.
When the thruster 6 is placed on a balance, if the high-voltage wire is directly connected to the thruster 6 from the flange on the bulkhead, the electrostatic force existing between the high-voltage wire and the ground wire or between the high-voltage wire and the bulkhead can exert a force on the thruster 6, thereby influencing the force on the balance when the thruster 6 works and further influencing the measurement result. The interference of this part of the electrostatic force can be excluded by using the wire group 2 isolation method.
Preferably, the isolation device consists essentially of a wire guide, a tray 3, preferably an L-shaped tray, and a wire support 1, the device being schematically illustrated in fig. 1. The L-shaped tray and the lead support 1 are made of acrylic materials and have good processability, and the L-shaped tray is used as a support of a metal wire and is also used for expanding the volume capacity of the tray 3; the metal wire leads are bare wires, so that the mass is reduced, and the moment generated by the leads on a balance tray is reduced. The metal wire is bent into a U-shaped shape, and the length of the lead is increased, so that the electrostatic force per unit length under the action of high voltage is reduced on the premise of ensuring the toughness of the lead. The tail end of the lead is welded with the needle head-shaped electric connector, and the electric connector is fixed on a matched support, namely the lead support 1 and the L-shaped tray, in a glue sealing mode.
The influence of the electrostatic force of the high-voltage wire between the support and the bulkhead on the high-precision balance can be eliminated by means of the U-shaped wire, namely the wire group 2, and the influence is limited in the wire group. The electrostatic force between the wire groups is mainly in the horizontal direction, and the thrust is measured in the vertical direction, so that the interference caused by the force applied to the balance is greatly reduced.
(2) And eliminating the electrostatic force of the wire connecting part of the thruster.
The wire from the L-shaped tray to the thruster part also has partial electrostatic interference, and particularly, the force between the vertical part of the tray and the wire in the vertical direction on the tray has large influence, so the electrostatic interference on the tray is also eliminated.
The specific method is to add a relay 5 in the circuit on the tray 3. The schematic diagram of the device is shown in fig. 2, and the relay 5 is a switching element formed by encapsulating two reeds made of a magnetic conductive and electric conductive material in a glass tube filled with inert gas such as nitrogen, helium and the like. When the coil wound on the relay 5 is energized to form a magnetic field to magnetize the reed, the contact of the reed induces a magnetic pole with opposite polarity. Because the polarities of the magnetic poles are opposite and mutually attracted, when the attracted magnetic force exceeds the resistance of the reed, the separated contact points are attracted; when the magnetic force is reduced to a certain value, the contact point is restored to the initial state under the action of the spring force, thus completing the action of a switch. The on-off of the relay is controlled by controlling the on-off of the current in the winding coil outside the relay. Because the influence caused by the part of the wires from the wire group 2 to the relay 5 cannot be eliminated, the thrust can be measured only by applying the measured difference between the working state and the non-working state of the thruster 6 under high pressure, and the influence of the electrostatic force under high pressure is calibrated by using the value measured when only high pressure is applied and the thruster 6 does not work.
Preferably, the L-shaped tray is an expansion tray made of an acrylic material, is 30mm high, 108mm wide and 130mm long, and is fixed with an original tray of the balance by adopting a bolt fastening method, the lead support 1 is made of an acrylic material, is 114mm high, 108mm wide and 60mm long at most, and is fixed with the shell of the balance by adopting an adhesive mode. The electric connector is fixed on the upper surfaces of the L-shaped tray and the lead support 1 by adopting a glue sealing method, the metal wire group is a common copper lead, the diameter is about 100 mu m, the length is about 2-3 times of the distance between the lead support 1 and the L-shaped tray, and the lead is welded with the electric connector. The mass of the relay 5 is 30g per month, the relay is provided with 4 wiring terminals, one end of each wiring terminal which bears the on-off task is connected to the wire set, the other end of each wiring terminal is connected with the emitter of the thruster 6, the leading-out electrode of the thruster 6 is also connected to the wire set, and the connecting wires which control the on-off of the relay 5 are connected to the other two wiring terminals of the relay 5 through the wire set 2. The electrical connectors on the wire support 1 are connected to a high voltage power supply and a relay power supply, respectively, by wires to the cabin wall.
The electrostatic force between the electric connector and the wire between the cabin walls can be eliminated through the wire group, the elimination of the electrostatic force on the tray 3 needs to be calibrated through balance reading when the high-voltage lower thruster 6 does not work, the balance reading when the power is not supplied is firstly read, then high voltage is applied, the relay 5 is still not switched on, the balance readings under different high voltages are read, the difference between the balance reading and the high voltage is the interference value of the electrostatic force, and when the thrust is measured, the interference value of the electrostatic force is subtracted from the data measured when the thruster 6 works, so that the thrust value is the value of the thrust.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.
Claims (6)
1. The electrostatic force interference elimination device is characterized by comprising a wire set (2), a relay (5) and a thruster (6);
one end of a controlled circuit of the relay (5) is connected with one end of a first connecting wire of the wire group (2);
one end of a control circuit of the relay (5) is connected with one end of a second connecting wire of the wire set (2);
the other end of the control circuit of the relay (5) is connected with one end of a third connecting wire of the wire group (2);
the other end of the first connecting wire of the wire group (2) is connected with one end of a high-voltage power supply;
the emitter of the thruster (6) is connected with the other end of the controlled circuit of the relay (5);
the leading-out pole of the thruster (6) is connected with one end of a fourth connecting line of the line group (2);
the other end of the fourth connecting wire of the wire set (2) is connected with the other end of the high-voltage power supply;
the other end of the second connecting wire of the wire group (2) is connected with the anode of the relay power supply;
the negative electrode of the relay power supply is connected with the other end of the third connecting wire of the wire group (2);
the wire guide device also comprises a wire support (1);
the electric connectors of the lead wire support (1) are connected with a high-voltage power supply and a relay power supply through the connecting wires of the cabin wall;
also comprises a tray (3);
the relay (5) and the thruster (6) are both arranged on the tray (3);
the bottom of the tray (3) is provided with a connecting piece;
the metal wire of the wire group (2) is bent into a U-shaped shape;
the tail end of the metal wire is welded with the needle head-shaped electric connector, and the electric connector is fixed on a matching support in a glue sealing mode, namely the wire support (1) and the L-shaped tray.
2. The electrostatic force interference elimination device of claim 1, further comprising a weighing module (4);
the weighing module (4) is connected with the tray (3) through a connecting piece.
3. The electrostatic force interference elimination device of claim 1, wherein the tray (3) is made of acrylic material.
4. The electrostatic force interference elimination device of claim 1, wherein the material of the wire support (1) is acrylic material.
5. The electrostatic force interference rejection device of claim 1, wherein said wire group (2) is a copper wire.
6. The electrostatic force interference elimination device of claim 1, wherein the relay (5) is a reed switch relay.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201810765055.XA CN109089369B (en) | 2018-07-12 | 2018-07-12 | Device for eliminating electrostatic force interference |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810765055.XA CN109089369B (en) | 2018-07-12 | 2018-07-12 | Device for eliminating electrostatic force interference |
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| CN109089369A CN109089369A (en) | 2018-12-25 |
| CN109089369B true CN109089369B (en) | 2021-06-04 |
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Citations (7)
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|---|---|---|---|---|
| GB573987A (en) * | 1943-03-31 | 1945-12-17 | Albert George Elliott | An improved instrument for the indication or measurement of thrust |
| SU552535A1 (en) * | 1975-12-12 | 1977-03-30 | Предприятие П/Я М-5147 | A device for measuring the thrust of a turbojet |
| CN101029844A (en) * | 2006-01-27 | 2007-09-05 | 梅特勒-托利多公开股份有限公司 | Weighing scales operating method and device |
| CN102072790A (en) * | 2010-11-16 | 2011-05-25 | 北京航空航天大学 | Device for measuring micro impulse |
| CN204027813U (en) * | 2014-07-30 | 2014-12-17 | 天津百利二通机械有限公司 | Electric device for valve life test rack structure |
| CN205209681U (en) * | 2015-11-26 | 2016-05-04 | 天津市西青区华兴电机制造有限公司 | Thrust test circuit that electromagnetic braking ware test bench was used |
| CN107543642A (en) * | 2017-08-24 | 2018-01-05 | 北京航空航天大学 | A kind of device and milli ox level vacuum plume aerodynamic force system of target method measurement electric thruster thrust |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10300259B2 (en) * | 2014-10-22 | 2019-05-28 | Purdue Research Foundation | Smart capsule with GI-tract-location-specific payload release |
| CN105261574B (en) * | 2015-10-28 | 2018-04-03 | 上海华力微电子有限公司 | A kind of method for excluding electrical noise jamming |
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2018
- 2018-07-12 CN CN201810765055.XA patent/CN109089369B/en active Active
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|---|---|---|---|---|
| GB573987A (en) * | 1943-03-31 | 1945-12-17 | Albert George Elliott | An improved instrument for the indication or measurement of thrust |
| SU552535A1 (en) * | 1975-12-12 | 1977-03-30 | Предприятие П/Я М-5147 | A device for measuring the thrust of a turbojet |
| CN101029844A (en) * | 2006-01-27 | 2007-09-05 | 梅特勒-托利多公开股份有限公司 | Weighing scales operating method and device |
| CN102072790A (en) * | 2010-11-16 | 2011-05-25 | 北京航空航天大学 | Device for measuring micro impulse |
| CN204027813U (en) * | 2014-07-30 | 2014-12-17 | 天津百利二通机械有限公司 | Electric device for valve life test rack structure |
| CN205209681U (en) * | 2015-11-26 | 2016-05-04 | 天津市西青区华兴电机制造有限公司 | Thrust test circuit that electromagnetic braking ware test bench was used |
| CN107543642A (en) * | 2017-08-24 | 2018-01-05 | 北京航空航天大学 | A kind of device and milli ox level vacuum plume aerodynamic force system of target method measurement electric thruster thrust |
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| Title |
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