CN1293583A - Static electricity dissipation in air compressors - Google Patents
Static electricity dissipation in air compressors Download PDFInfo
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- CN1293583A CN1293583A CN 99804047 CN99804047A CN1293583A CN 1293583 A CN1293583 A CN 1293583A CN 99804047 CN99804047 CN 99804047 CN 99804047 A CN99804047 A CN 99804047A CN 1293583 A CN1293583 A CN 1293583A
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- fluid
- compressor
- air
- compound
- electrostatic dissipation
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- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C3/00—Fire prevention, containment or extinguishing specially adapted for particular objects or places
- A62C3/06—Fire prevention, containment or extinguishing specially adapted for particular objects or places of highly inflammable material, e.g. light metals, petroleum products
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
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- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Compressor (AREA)
- Elimination Of Static Electricity (AREA)
Abstract
The compressor fluid or oil of an air compressor system which is dielectric or electrically insulative is treated with a static dissipative compound to increase its electrical conductivity. The static dissipative compound may be added directly to the compressor fluid, or it may be added by supplying an air-oil separator (13) which is treated or impregnated with the static dissipative compound. The treatment of the compressor fluid reduces the flammability of the compressor fluid by dissipating static electricity build-up.
Description
Background of invention
1. invention field
The present invention is about such as the compressor fluid that is used for gas compressor system, especially about the electrostatic dissipation in this fluid.
2. the description of prior art
Such as gas compressor and other similar compressor of vacuum compressor and compressor for cooling fluid class, the employing fluid liquid cools off, seals and be lubricated.Being " oil " though these fluids are commonly referred to as, mainly is the selected especially organic liquid of selecting according to heat exchange characteristics, viscosity and lubricity.The liquid that uses as oil in gas compression system comprises compound, petroleum-based fluids, silicon-based oil and the strong hydrotreated paraffinic oils of polyalphaolefin (PAO), polypropylene glycol, polyolester (POE), diester base oil, PAO and diester fluid.Have been found that a lot of this fluids are to use at other, be used for compressor assembly behind the hydraulic fluid as hydraulic system.
Some this class fluid, particularly PAO fluids are at first as the cooling agent in the piezoelectric transformer.The exchange characteristics that the PAO fluid presents in the transformer cooling agent makes this fluid generally select the oil of doing in the gas compressor for use, is still generally adopting up to today.Owing to they are that development comes in the use of piezoelectric transformer, this fluid is nonconducting fluid, that is to say, this fluid plays the effect of the electrical insulator that prevents any current delivery.The PAO fluid that is used for gas compressor is sold with following various brand names: the Sullube32 that is sold by the Sullair company in the Michigan city of Indiana State; The AEON 9000 that the Gardner Denver company in the Quincy city in Yi Linuoyi state sells; The Quin-Syn series of selling by the Quincy compressor section of the Coltec industry in Quincy city, Yi Linuoyi state; The Roto jetting fluid of selling by the Atlas Copco aerodynamic force company of Belgian Wilrijk.
This compressor fluid or oil not only are used for sealing and cooling, but also are used to lubricate, and some oil become and are suspended in the air-flow for this reason.Usually before the Compressed Gas discharging, from air-flow, remove the mist of oil of suspension with air-oil separator.Separator uses the gas that gives off under the situation that does not have greasy dirt to dye, reclaim the oil that can reuse simultaneously.Air-oil separator is installed on the cover or fuel tank with disengagement chamber usually, and air-flow flows through disengagement chamber above oil vessel.Separator comprises the gathering medium, and the gas of discharging tells oil by assembling medium from air-flow.It is cylindrical and be vertically arranged to assemble medium, that is the axle that cylindrical shape is assembled medium is vertically extending.The gas that contains enters disengagement chamber from the separator outside, and flows into the middle part of separator, flows out disengagement chamber then vertically.When the air-flow radial flow was crossed the separator layer, oil accumulation also was collected in the separator, adopted the device of scavenge system to come siphon usually or entered in the container, to reuse.The flow direction of oil also can to introduce air-oil separator neutralization opposite by the direction that separator is flowed radially outward with oil-containing gases, at oil accumulation be collected in separator and be discharged in the container when outside.
Because the fluid as PAO is nonconducting, electrostatic charge can form in the oil of contained atomizing in loose oil and air-flow.Because fluid is subjected to high shear in compressor chamber, this just makes static form.Because fluid is nonconducting, even the wall of the compressor that contacts with fluid or other metal are ground connection, these electrostatic charges will be stayed in the fluid.The electrostatic charge that forms, the high temperature that may occur and the burning gases associating of supplying with will be produced a kind of state that makes emission gases become high imflammable gas, the combustibility of this mixture are in air-oil separator and fuel tank and especially obvious on every side.
Summary of the invention
The present invention forms problem by the static in the oil of the air-flow that electrostatic dissipation is provided solves gas compressor system in compressor fluid.According to the present invention, handle compressor fluid with the electrostatic dissipation compound, make compressor fluid less form electrostatic charge, therefore make its potential electrostatic charge in the minimizing compressor airflow before arriving potential flammable and unsafe conditions.
According to the present invention, available several different methods adds the electrostatic dissipation compound in the compressor fluid.The electrostatic dissipation compound can directly be added in the compressor fluid or oil in compressor, increases the electric conductivity of suspension mist of oil in the air-flow, dissipates the electrostatic charge in the air-flow before its arrives potential dangerous magnitude.Available in addition electrostatic dissipation composite coated or immersion air-oil separator.This then compound infiltrates compressor fluid in fluid and flow separation and when turning back to container, handle compressor fluid with the electrostatic dissipation compound thus.In addition, with composite coated with soak air-oil separator and will make more easy conductive of air-oil separator, if separator ground connection suitably just provides added security for fuel tank.In addition as a kind of replacement method, have nonconducting compressor fluid of mainly forming by PAO, can be during fabrication with the processing of electrostatic dissipation compound, when the custom replaceable compressor fluid, new fluid will have the electric conductivity that has increased.
Provide above-mentioned and other advantage by the method for operating gas compressor of the present invention, this method comprises the following steps: to provide an exhaust jet stream, adopts electrical insulation fluids as cooling agent and lubricant, and the droplets suspended of this fluid is in air-flow; Handle compressor fluid in the fluid by the electrostatic dissipation compound is added to, make fluid increase its electric conductivity, prevent that excessive electrostatic charge from forming, the adding of compound makes droplet in the air-flow from the electrostatic dissipation that becomes of insulation.
Summary of drawings
Fig. 1 is the side view of the fuel tank assembly analysed and observe of part, and this assembly has the air-oil separator that can be used as parts of the present invention.
Fig. 2 is the side view of the oil strainer of gas compressor system, and this filter can be used as parts of the present invention.
Fig. 3 is the end view of Fig. 2 oil strainer.
Fig. 4 is the influence of the antistatic additive of various concentration in the gas compressor fluid to electric conductivity.
Detailed description of preferred embodiment
With reference to accompanying drawing 1, it illustrates a kind of fuel tank assembly 10 that is used for gas compressor at first especially.Fuel tank assembly described here and illustrated is a kind of in a lot of designs of using of typical case.Fuel tank assembly 10 comprises the body 11 with an oil groove 12, and oil groove is formed in its bottom, and in order to collect compressor fluid or the oil of removing in the oily separation process, a disengagement chamber 13 is formed at the top of body 11.The top of disengagement chamber 13 is by case lid 14 sealings, and case lid is installed on the body 11 by fuel tank seal or the pad between some screws or other suitable fastening and body and the lid.On a side of body 11, have gas access 15, be used to make gas to enter disengagement chamber 13.Gas passes the passage (not shown) on the case lid 14 and the outlet 16 of passing on the case lid is flowed out from disengagement chamber.
In disengagement chamber 13 configuration of a pre-separation can be arranged, as be generally cylindrical sleeve 18, it makes from the gas access air-flow and turns to, and changes into downwards and center on the air-flow of sleeve.The first step that this just provides gas-oil to separate, the wherein big oil that drips is owing to the unexpected variation of airflow direction is separated, and these oil droplets fall into container 12.Another kind of known pre-separation configuration can be used on the sleeve 18.The safety valve 17 that passes sleeve 18 also is housed in body 11, and safety valve 17 is dropping valves, and the air pressure in sleeve 18 is increased to predetermined pressure, and it is just opened when above.Air-flow upwards also axially flows downward then, passes air-oil separator 19.Separator 19 generally includes two or more coaxial placing layers, these placing layers comprise the multistage layer of discharging in multistage layer of the gathering of upstream and downstream, every layer all comprises the suitable associating material that is used for gas-oil separation, these materials such as glass fibre, polyester, polypropylene or metal, some materials can be folding with traditional approach, or be shaped with molded, shaping, coating or alternate manner.This air-oil separator 19 also preferably includes the outer wrapping layer that is positioned at the separator outside and along the supporting member of outer surface.Every end of these layers is equipped with hardenable encapsulant or encapsulating material, as urethane, epoxy or plastisol, these materials separate design by common gas-oil and form the annular end cap that has the metal backing lid usually.
Remove pipe 20 for one and stretch into disengagement chamber in the separator 19, manage 20 from oily available this removing of the discharging of separator 19 and draw back from case lid 14.
The compressor fluid or the oil that are stored in the container 12 and are used for air compressor are a kind of fluids, and it mainly is made up of poly alpha olefin (PAO), and it is a kind of nonconducting material, that is the material of insulation, and it once was developed into and is used to cool off piezoelectric transformer.When being used for here, term " conduction ", " electrostatic dissipation " and " insulation " have the same meaning with electrostatic discharge association (ESD association) definition of the Rome of New York usually.Being considered to the material of " conduction " or the electric conductivity of material is to be less than 105 ohm on every square unit surface area, is considered to the material of " electrostatic dissipation " or electric conductivity that material has and is on every square unit surface area 105～1012 ohm.The electric conductivity that is considered to " insulation " material or material is greater than 1012 ohm on every square unit surface area.Compressor fluid such as the fluid of PAO base falls into " insulation " body scope.Therefore be suspended in compressor fluid or the droplet of oil or the tendency that mist has the formation electrostatic charge in the compressor airflow.This insulation characterisitic of oil makes electrostatic charge be difficult for dissipating.When the compressor compresses air, form electrostatic charge along with the increase of gas temperature, this air-flow becomes high flammable air-flow.
According to the present invention, this compressor fluid or oil are handled with a kind of liquid, this liquid is a kind of compound or antistatic additive of electrostatic dissipation, it makes compressor fluid, comprises that the fluid that is suspended in the air-flow changes to " electrostatic dissipation " district from " insulation " district, dissipates the electrostatic charge that may form.The example of this compound be a kind of be the Staticide product sold with the trade mark, it can obtain from the ACL Co., Ltd of the ElK Groxe in Yi Linuoyi state.This product is anlistatig polymer, also can adopt other suitable electrostatic dissipation compound or antistatic additive.
The processing of oil can adopt multiple mode to finish.
During manufacture or in the later time, available electrostatic dissipation compound soaks or applies one or more layers air-oil separator 19.If the electrostatic dissipation compound of q.s is soaked into separator 19, it will infiltrate in the fluid lentamente.To replace separator 19 owing to cross certain hour in most of compressor assemblies, each new separator will be supplied with new electrostatic dissipation compound, and this will continuously handle compressor fluid.Therefore this separator plays an effect that the electrostatic dissipation compound is configured to the configurator in the compressor fluid on the whole time, thereby handles compressor fluid continuously and make the electrostatic dissipation of this fluid.When compound oozes out from separator fully, this separator will be replaced, thereby new compound infiltrates in the compressor fluid.
Applying or soaking the electrostatic dissipation compound also makes oil/gas separating device itself more can electrostatic dissipation.Therefore when oil is run into the separator 19 of conduction, can dissipate any residual electrostatic charge that may on the oil droplet after the processing, form.In order to obtain this advantage, separator must be able to be installed on the fuel tank assembly conductively.In other words, separator must ground connection.People have known by providing the metal shackle to make air-oil separator ground connection on rubber blanket, yet this method has negative effect to the pad effect.Preferably coating rubber seal or urethane encapsulation compound is fixed together with their end and electrostatic dissipation materials with the separator layer.In the method, whole separator 19 can be grounding on the body of the fuel tank assembly of ground connection.The electrostatic dissipation material can be coated on pad or the urethane encapsulated layer, or mixes with urethane before urethane solidifies, and drops to 105～109 ohm by the resistance that makes urethane and makes this urethane electrostatic dissipation.
Except air-oil separator, oil strainer also can be used as the configurator of electrostatic dissipation material.Be used in oil strainer in the gas compressor and be oil strainer 21 as shown in Figure 2.This oil strainer is walked around filter spin, and it has a solid outer cover 22 and two as oil-in and the concentric cavities 24 of outlet and 25 the internal thread 23 of a branch on the beginning.Filter 21 installs on the container 12 by screw thread 23 or near the fueller it.In the cover 22 is one or more layers filter medium, every layer includes the suitable material that should be used for the oil filtration, modes such as these materials such as glass fibre, polyester, polypropylene or metal, some in them are can general fashion folding, other can be molded, shaping, parcel are shaped.Available electrostatic dissipation composite coated or soak in these layers one or more layers.Enter oil strainer 21 if the electrostatic dissipation compound of q.s soaks, it will infiltrate in the fluid lentamente.Since in most of compressor assemblies oil strainer resemble the separator 19 be at certain time intervals in replacing, each new filter will bring new electrostatic dissipation compound, these compounds are handling oil continuously, so this oil strainer also plays the effect of the configurator of electrostatic dissipation compound.Before compound oozes out fully, will replace filter from oil strainer, new like this compound will infiltrate in the oil of confession.
Directly the electrostatic dissipation compound is added to fluid or handles the existing fluid except adopting by ooze out the electrostatic dissipation compound from air-oil separator, the additive that this compressor fluid also can be used on when originally making is handled, thereby the amount of antisatic additive will not depend on the quantity of material that in use is added in the fluid, be preferably in the new system and handle compressor fluid, or handle compressor fluid when in existing system, replacing compressor fluid fully.
It is the electric conductivity that has increased this fluid greatly that electrostatic dissipation compound or antistatic additive are added to the result who produces in the compressor fluid.Adopted normally used PAO base compressor fluid and tested in the electrostatic dissipation agent that this fluid adds various quantity, adopt the test method ASTM D4308 of standard to measure the electric conductivity of fluid then, this method is in order to the electric conductivity of the hydrocarbon liquid of definite aviation fuel and other similar low electric conductivity, and the electric conductivity of these liquid is in every meter 0.1～2000 * micromicro Siemens (ps/m).Every meter micromicro Siemens (ps/m) is general conduction unit, and Siemens is the inverse of ohm.
1ps／m=1×10
-12Ω
-1m
-1
Three kinds of different electrostatic dissipation additives of variable concentrations, wherein a kind of staticide of being adds in the normally used commercially available PAO base compressor fluid, measures the electric conductivity of this fluid according to ASTM D4308 test standard.Result of the test under the electrostatic dissipation agent concentration that illustrates with a few millionths (ppm) has been shown in following table and Fig. 4.
| Additive concentration (ppm) | Fluid conductivity (ps/m) | ||
| Additive A | Additive B | Addition of | |
| 10 | 6 | 83 | 17 |
| 100 | 12 | 331 | 53 |
| 500 | 25 | 862 | 96 |
| 1000 | 49 | 1997 | 121 |
Result of the test shows that typical PAO base compressor fluid itself insulate, and conductivity measurements is very low, adds the electrostatic dissipation agent as staticide, has increased the electric conductivity of compressor fluid greatly.Add that suitable minor amounts of additives can make compressor fluid become " electrostatic dissipation " from " insulation " defined above.Can will be added with the electric conductivity of increase of compressor fluid of electrostatic dissipation additive and the desired electric conductivity of aircraft engine fuel relatively, aircraft engine fuel is to prevent that its electric conductivity of electrostatic charge flammability issues in the fuel tank from should be 50～450ps/m.When fuel electric conductivity was raised to 1ps/m, fluid just became " electrostatic dissipation ".Thereby avoid forming the danger that electrostatic charge is brought in order to make fluid have enough electrostatic dissipation characteristics, should make the electric conductivity of fluid be elevated to 50ps/m or higher by adding additive.By being added in the compressor fluid, a spot of antistatic additive just can obtain this conductivity level as can be seen.
Concerning those skilled in the art, all be conspicuous to other variation and the modification of description and illustrated embodiment here, and they all dissolve within the spirit and scope of the present invention.The present invention is described with reference to special embodiment, and these embodiment use as restriction for illustrative purposes only and not.Therefore, this patent is not limited only to the scope and the effect of specific embodiments described herein, also be not limited to any alternate manner with the inconsistent content of the acquired technical progress of the present invention.
Claims (10)
1. the method for an operating gas compressor comprises the following steps:
One exhaust jet stream is provided,
Adopt the compressor fluid of electric insulation to make cooling agent and lubricant, the droplets suspended of these fluids in air-flow and
Handle compressor fluid in the fluid by the electrostatic dissipation compound is added to, with the electric conductivity that increases fluid and prevent that excessive electrostatic charge from forming, add that compound makes droplet in the air-flow from the electrostatic dissipation that changes over of electric insulation.
2. the method for operating gas compressor as claimed in claim 1 adds that wherein the electrostatic dissipation compound changes to the electric conductivity of compressor fluid and is at least 1ps/m.
3. the method for operating gas compressor as claimed in claim 2 adds that wherein the electrostatic dissipation compound makes the electric conductivity of compressor fluid change to 50ps/m at least.
4. the method for operating gas compressor as claimed in claim 1, wherein before handling fluid with the electrostatic dissipation compound, the electric conductivity of compressor fluid is less than 1ps/m.
5. the method for operating gas compressor as claimed in claim 1, wherein the compressor fluid that is provided is the fluid of polyalphaolefin base.
6. the method for operating gas compressor as claimed in claim 1, wherein treatment step comprises Staticide is added in the fluid.
7. the method for operating gas compressor as claimed in claim 1, wherein fluid is handled by air-oil separator is soaked with the electrostatic dissipation compound, and compound infiltrates fluid when fluid is isolated from air-flow by separator.
8. the method for operating gas compressor as claimed in claim 1, wherein fluid is handled by oil strainer is soaked with the electrostatic dissipation compound, makes compound infiltrate fluid when filtering fluid.
9. the method for an operating gas compressor comprises the following steps:
One exhaust jet stream is provided,
Adopt the compressor fluid of electric insulation to make cooling agent and lubricant, the droplets suspended of this fluid is in air-flow;
Adopt air-oil separator from air-flow, to remove the droplet of suspension to reuse; With
Handle compressor fluid by the electrostatic dissipation compound is added in the above-mentioned fluid, with the electric conductivity that increases this fluid and prevent that excessive electrostatic charge from forming, add compound and make droplet in the air-flow by the electrostatic dissipation that becomes of insulation.
10. the method for operating gas compressor as claimed in claim 9, wherein fluid is handled by air-oil separator is soaked with the electrostatic dissipation compound, makes compound infiltrate fluid when by separator fluid being told from air-flow.
Applications Claiming Priority (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US7819398P | 1998-03-16 | 1998-03-16 | |
| US60/078,193 | 1998-03-16 | ||
| US8742598P | 1998-06-01 | 1998-06-01 | |
| US60/087,425 | 1998-06-01 | ||
| US8874998P | 1998-06-10 | 1998-06-10 | |
| US60/088,749 | 1998-06-10 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1293583A true CN1293583A (en) | 2001-05-02 |
Family
ID=27373231
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 99804047 Pending CN1293583A (en) | 1998-03-16 | 1999-03-16 | Static electricity dissipation in air compressors |
Country Status (7)
| Country | Link |
|---|---|
| EP (1) | EP1064054A4 (en) |
| JP (1) | JP2002506945A (en) |
| CN (1) | CN1293583A (en) |
| AU (1) | AU3093299A (en) |
| CA (1) | CA2321521A1 (en) |
| TR (1) | TR200002639T2 (en) |
| WO (1) | WO1999047211A1 (en) |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1059994B1 (en) | 1998-02-28 | 2004-04-28 | Donaldson Company, Inc. | Conically shaped air-oil separator |
| JP4852422B2 (en) | 2003-11-17 | 2012-01-11 | ドナルドソン カンパニー，インコーポレイティド | Separation apparatus and separation method for gas / liquid separation |
| WO2006052732A2 (en) | 2004-11-05 | 2006-05-18 | Donaldson Company, Inc. | Filter medium and structure |
| US8057567B2 (en) | 2004-11-05 | 2011-11-15 | Donaldson Company, Inc. | Filter medium and breather filter structure |
| US8557007B2 (en) | 2005-01-19 | 2013-10-15 | Donaldson Company, Inc. | Air/oil separator and inlet baffle arrangement |
| EP2125149A2 (en) | 2007-02-23 | 2009-12-02 | Donaldson Company, Inc. | Formed filter element |
| EP2502659A3 (en) | 2007-03-20 | 2013-12-11 | Donaldson Company, Inc. | Aerosol seperator assembly; components; and, methods |
| US8404029B2 (en) | 2007-06-14 | 2013-03-26 | Donaldson Company, Inc. | Crankcase ventilation filter arrangments; components; and, methods |
| WO2009018454A2 (en) | 2007-08-02 | 2009-02-05 | Donaldson Company, Inc. | Crankcase ventilation filter assembly; components; and, methods |
| US9885154B2 (en) | 2009-01-28 | 2018-02-06 | Donaldson Company, Inc. | Fibrous media |
| KR101479727B1 (en) * | 2013-05-29 | 2015-01-06 | (주)코리아씰팩 | Air oil separating apparatus for compressor |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4378920A (en) * | 1980-07-15 | 1983-04-05 | The Boeing Company | Combustibly inert air supply system and method |
| US4378851A (en) * | 1980-09-08 | 1983-04-05 | Quad Environmental Technologies Corporation | Method for inhibiting explosions |
| US5099976A (en) * | 1990-10-19 | 1992-03-31 | W. B. Jamison Limited Partnership | Fire extinguishing apparatus for compressors |
-
1999
- 1999-03-16 JP JP2000536443A patent/JP2002506945A/en not_active Withdrawn
- 1999-03-16 EP EP99912588A patent/EP1064054A4/en not_active Withdrawn
- 1999-03-16 CN CN 99804047 patent/CN1293583A/en active Pending
- 1999-03-16 CA CA002321521A patent/CA2321521A1/en not_active Abandoned
- 1999-03-16 TR TR2000/02639T patent/TR200002639T2/en unknown
- 1999-03-16 AU AU30932/99A patent/AU3093299A/en not_active Abandoned
- 1999-03-16 WO PCT/US1999/005744 patent/WO1999047211A1/en not_active Application Discontinuation
Also Published As
| Publication number | Publication date |
|---|---|
| TR200002639T2 (en) | 2001-02-21 |
| JP2002506945A (en) | 2002-03-05 |
| WO1999047211A1 (en) | 1999-09-23 |
| EP1064054A1 (en) | 2001-01-03 |
| CA2321521A1 (en) | 1999-09-23 |
| AU3093299A (en) | 1999-10-11 |
| EP1064054A4 (en) | 2001-04-04 |
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
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