CN1218007C - Electric insulating and cooling material for high-voltage power-supply unit - Google Patents

Electric insulating and cooling material for high-voltage power-supply unit Download PDF

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Publication number
CN1218007C
CN1218007C CN991205804A CN99120580A CN1218007C CN 1218007 C CN1218007 C CN 1218007C CN 991205804 A CN991205804 A CN 991205804A CN 99120580 A CN99120580 A CN 99120580A CN 1218007 C CN1218007 C CN 1218007C
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CN
China
Prior art keywords
insulating material
mixture
electrically insulating
supply unit
fine grain
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.)
Expired - Fee Related
Application number
CN991205804A
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Chinese (zh)
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CN1256300A (en
Inventor
H·W·A·耶德利特希卡
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GE Medical Systems SCS
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GE Medical Systems SCS
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Publication of CN1256300A publication Critical patent/CN1256300A/en
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Publication of CN1218007C publication Critical patent/CN1218007C/en
Anticipated expiration legal-status Critical
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
    • H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
    • H01B3/44—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins
    • H01B3/441—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins from alkenes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/02—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances
    • H01B3/12—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances ceramics
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
    • H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
    • H01B3/42—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes polyesters; polyethers; polyacetals
    • H01B3/427—Polyethers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
    • H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
    • H01B3/44—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins
    • H01B3/443—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins from vinylhalogenides or other halogenoethylenic compounds
    • H01B3/445—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins from vinylhalogenides or other halogenoethylenic compounds from vinylfluorides or other fluoroethylenic compounds
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05G—X-RAY TECHNIQUE
    • H05G1/00—X-ray apparatus involving X-ray tubes; Circuits therefor
    • H05G1/02—Constructional details
    • H05G1/025—Means for cooling the X-ray tube or the generator
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05G—X-RAY TECHNIQUE
    • H05G1/00—X-ray apparatus involving X-ray tubes; Circuits therefor
    • H05G1/02—Constructional details
    • H05G1/04—Mounting the X-ray tube within a closed housing

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  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • X-Ray Techniques (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Inorganic Insulating Materials (AREA)
  • Organic Insulating Materials (AREA)
  • Cooling Or The Like Of Electrical Apparatus (AREA)

Abstract

Insulation and cooling material for high-voltage supply devices is a composite of at least one thermoplastic polymer and of at least one particulate ceramic filler so that the matieral has a thermal conductivity of at least 0.9 W/M.K. The thermoplastic polymer may be polypropylenes, poly (etherimides), poly(phenylsulphides) and poly(etherimide)/poly(phenyl-sulphide) mixtures. The particulate ceramic fillers may be alumina, aluminum nitride, boron nitride, barium suplhate and beryllium oxide and mixtures thereof. The high-voltage supply device is intended for X-ray tubes.

Description

The electrical isolation of high-voltage power-supply unit and cooling material
Technical field
The present invention relates to the insulation and the cooling material of power supply of insulation and cooling material, the especially X-ray tube of high pressure (HV) power unit, and relate to the high-voltage power-supply unit that comprises these materials.
Background technology
As everyone knows, X-ray tube comprises the heater cathode of anode divergent bundle.Under the bombardment effect of this electron beam, anode emission X ray.In order to obtain high energy electron beam, utilize the highfield that between negative electrode and anode, produces to quicken described electronics.For this reason, anode is thus lifted to the very high positive potential with respect to negative electrode.This current potential may be above 150 kilovolts.High-voltage power-supply unit is in order to produce this current potential.
In general, the active parts of high-voltage power-supply unit is closed and is supported in first housing of being made by electrically insulating material with ribbing or surrounding layer (surround), and first housing that comprises described active parts itself is comprised in that be made of metal and second housing ground connection in.Include the internal space of first housing of source block and the space between first and second housings with insulation and cooling liqs, normally oil is filled.
More particularly, by the active parts of the first housing mesohigh power unit, for example, each parts of high-tension transformer, rectifier doubler and all conducting elements are placed in the different cabins of this first housing of being made by high-strength insulating material, for example electrical isolation moulding material and make their fix in position and insulated from each other electric mechanically.Freeboard in first housing is also filled with insulation and cooling liqs such as oil.
The freeboard of the oil-filled connection between second housing of first enclosure interior and first housing and ground connection constitutes usually said high-pressure space.
X-ray tube work desired power is may be up to 25 kilowatts to 100 kilowatts in several seconds zero point.Even high-voltage power-supply unit has very high efficient, the restriction of the temperature rise in the high-pressure space that also is subjected to causing by the power that this equipment provided by the electrical loss in the active parts.These losses may be equivalent to 6% of described output rating.Common power loss is approximately several kilowatts.
For fear of the cause thermal damage of the described sensor that causes by these power losss, need remain on lower temperature to described high-pressure space.
Summary of the invention
The purpose of this invention is to provide the insulation and the cooling material of the novelty that is used for high-voltage power-supply unit, described material has the thermal conductivity of raising, so that improve the dissipation of the heat that on period produces in this equipment.
Therefore, the invention provides a kind of high voltage device insulating electrically insulating material that is used for making the insulation high-voltage power-supply unit that is suitable for exporting 25kW-100kW power, this insulating material bears high pressure, described electrically insulating material comprises: the mixture of at least a thermoplastic polymer and at least a fine grain ceramics weighting material, and wherein said fine grain ceramics weighting material accounts for the 40%-80% of described mixture total weight amount; Described at least a thermoplastic polymer selects from the mixture of polypropylene, tetrafluoroethylene, polyetherimide, polyphenylene sulfide and polyetherimide and polyphenylene sulfide, and described ceramic weighting material is to select from aluminum oxide, aluminium nitride, boron nitride and their mixture; Described electrically insulating material has heat-conduction coefficient, the dielectric strength of at least 50 kvolts/millimeter, the specific inductivity between 2 and 4 of 0.9W/m.K. at least, so that described electrically insulating material can be not breakdown when the power of 25kW-100kW.
Preferably, described fine grain ceramics weighting material accounts for 40% to 60% of described mixture total weight amount.
Described fine grain ceramics weighting material has the granularity between 10 microns and 60 microns.
U.S. Patent application No.09/168 has described a kind of the present invention and has been applicable to wherein high-voltage power-supply unit in 843 (this patent application is incorporated herein as a reference).Briefly, will comprise described high-voltage power-supply unit fix in position in each shell of modular support of each active parts, the sidewall of described each shell by have eclipsed complementary inclined-plane, not only provide electrical isolation but also provide heat conducting element to constitute.
Description of drawings
Fig. 1 shows the sectional view of the signal of high-voltage power-supply unit according to an embodiment of the invention.
Embodiment
Fig. 1 schematically illustrates high-voltage power-supply unit 1, and it comprises by convention and is immersed in the oil and utilizes one or more surrounding layers 11 of being made by solid insulating material to support and insulating active parts 10.
These active parts 10 and described support and insulation surrounding layer 11 itself are closed in the housing with ribbing 12 of ground connection for example made of aluminum.
Respectively between active parts 10 and the insulation surrounding layer 11 and the freeboard 13,14 between the housing 12 of insulation surrounding layer 11 and ground connection communicate with each other and be filled with transformer oil.
The electrical isolation of surrounding layer 11 and cooling material comprise the mixture of the ceramic weighting material of at least a thermoplastic polymer and at least a particulate, make described material have the heat-conduction coefficient of 0.9W/m.K. at least.
Insulation surrounding layer 11 can be the multiple surrounding layer that comprises the monomer surrounding layer that overlaps each other that is separated by the interval of filling with transformer oil.
Though the transformer oil that is generally used for high-voltage power-supply unit under the situation that does not have any extra electric field has the heat-conduction coefficient of about 0.115W/m.K., but, have been found that, for example, by applying flowing of oil that the high electric field that is present in high-voltage power-supply unit or any other device causes, these identical oil have much bigger heat-conduction coefficient, and according to the geometrical shape of described equipment, these coefficients may exceed 30 to 100 times.This shows that for heat dissipation, the solid insulating material of surrounding layer 11 is crucial factors.
Any thermoplastic polymer that might obtain the thermal conductivity of needed 0.9W/m.K. at least and not reduce insulation and other needed performance, for example dielectric strength and the specific inductivity of cooling material may be used to mixture of the present invention.Specifically, dielectric strength should be greater than 50 kvolts/millimeter, and specific inductivity is between 2 and 4.
In addition, described insulating material should be such: it allows for example to utilize mold pressing, injection moulding mold pressing or extruding, and perhaps any other traditional commercial run is easy to conversion (conversion) according to commercial production scale.
For the ease of described conversion, any traditional processing means can be included in the described material.
At the polymkeric substance that is used for preparing mixture of the present invention, can mention polypropylene, fluoropolymer, for example, polytetrafluoroethylene (PTFE), voltalef (PCTFE), and polyvinylidene difluoride (PVDF) (PVDF), polyamide-imide (PAT), polyetherimide (PET), polyether sulfides (PES), polyphenylene sulfide (PPS) and their mixture.
Best polymer is a polypropylene, polyetherimide, tetrafluoroethylene and polyphenylene sulfide and polyetherimide/polyphenylene sulfide mixture.
Useful fine grain ceramics weighting material is all stupaliths that make this mixture have needed thermal conductivity and don't reduce other performance, the especially electrical insulation capability of insulation and cooling material in preparation mixture of the present invention.
Best fine grain ceramics weighting material is an aluminum oxide, aluminium nitride, boron nitride, barium sulfate and beryllium oxide, and their mixture.
Especially to recommend boron nitride, aluminium nitride and their mixture.
According to the weight meter, in the described mixture quantity of fine grain ceramics weighting material be at least usually this mixture gross weight 40%, generally between 40% and 80% (weight), best from 40% to 60% (weight).
The fine grain ceramics weighting material generally has the granularity between 1 micron and 100 microns, preferably has the granularity between 10 microns and 60 microns.
Can randomly apply the particle of described ceramic weighting material with another kind of material layer, described material does not damage thermal conduction and electrical insulation capability, and the silicon layer of lubrication for example is provided for described particle.
Embodiment
Method with simple mechanically mixing has prepared insulation and cooling material according to an embodiment of the invention, and according to the weight meter, it comprises 30% poly-sulfuration phenyl, 30% polytrimethylene ether imide, 25% aluminium nitride powder and 15% boron nitride powder.
With described material injection molding, produced 60 millimeters of diameters, the disc shaped sample that thickness is 4 millimeters, measured following performance:
Thermal conductivity (75 ℃)＞0.96W/m.K.
Disruptive strength＞70.5 kvolts/millimeter
Specific inductivity 3.4 (1 kilo hertz, 75 ℃).
The professional and technical personnel can be under the situation that does not break away from the spirit and scope of the present invention, structure and/or function and/manufacturing step aspect, the disclosed embodiments are carried out various modifications.

Claims (3)

1. high voltage device insulating electrically insulating material that is used for making the insulation high-voltage power-supply unit that is suitable for exporting 25kW-100kW power, this insulating material bears high pressure, and described electrically insulating material comprises:
The mixture of at least a thermoplastic polymer and at least a fine grain ceramics weighting material, wherein said fine grain ceramics weighting material accounts for the 40%-80% of described mixture total weight amount;
Described at least a thermoplastic polymer selects from the mixture of polypropylene, tetrafluoroethylene, polyetherimide, polyphenylene sulfide and polyetherimide and polyphenylene sulfide, and described ceramic weighting material is to select from aluminum oxide, aluminium nitride, boron nitride and their mixture;
Described electrically insulating material has heat-conduction coefficient, the dielectric strength of at least 50 kvolts/millimeter, the specific inductivity between 2 and 4 of 0.9W/m.K. at least, so that described electrically insulating material can be not breakdown when the power of 25kW-100kW.
2. according to the electrically insulating material of claim 1, it is characterized in that: described fine grain ceramics weighting material accounts for 40% to 60% of described mixture total weight amount.
3. according to the electrically insulating material of claim 1, it is characterized in that: described fine grain ceramics weighting material has the granularity between 10 microns and 60 microns.
CN991205804A 1998-10-05 1999-09-30 Electric insulating and cooling material for high-voltage power-supply unit Expired - Fee Related CN1218007C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR98/12443 1998-10-05
FR9812443A FR2784261B1 (en) 1998-10-05 1998-10-05 INCREASED ELECTRICAL INSULATION AND COOLING MATERIAL FOR THERMAL CONDUCTIVITY AND APPLICATION TO THE INSULATION OF A HIGH VOLTAGE SUPPLY DEVICE

Publications (2)

Publication Number Publication Date
CN1256300A CN1256300A (en) 2000-06-14
CN1218007C true CN1218007C (en) 2005-09-07

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CN991205804A Expired - Fee Related CN1218007C (en) 1998-10-05 1999-09-30 Electric insulating and cooling material for high-voltage power-supply unit

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EP (1) EP0993238A1 (en)
JP (1) JP2000123635A (en)
KR (1) KR20000028811A (en)
CN (1) CN1218007C (en)
FR (1) FR2784261B1 (en)
IL (1) IL131930A0 (en)

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FR2845241B1 (en) * 2002-09-26 2005-04-22 Ge Med Sys Global Tech Co Llc X-RAY EMISSION DEVICE AND X-RAY APPARATUS
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JP5065028B2 (en) 2005-08-31 2012-10-31 エルジー・ケム・リミテッド Reflector for backlight unit of liquid crystal display device and backlight unit having good thermal conductivity
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CN102648501A (en) 2009-12-04 2012-08-22 Abb研究有限公司 A high voltage surge arrester
US9335427B2 (en) 2013-11-22 2016-05-10 General Electric Company High voltage shielding to enable paschen region operation for neutron detection systems
US12062700B2 (en) 2018-04-04 2024-08-13 Qorvo Us, Inc. Gallium-nitride-based module with enhanced electrical performance and process for making the same
US12046505B2 (en) 2018-04-20 2024-07-23 Qorvo Us, Inc. RF devices with enhanced performance and methods of forming the same utilizing localized SOI formation
CN118213279A (en) 2018-07-02 2024-06-18 Qorvo美国公司 RF semiconductor device and method for manufacturing the same
US11646242B2 (en) 2018-11-29 2023-05-09 Qorvo Us, Inc. Thermally enhanced semiconductor package with at least one heat extractor and process for making the same
CN113632209A (en) 2019-01-23 2021-11-09 Qorvo美国公司 RF semiconductor device and method for manufacturing the same
US12046483B2 (en) 2019-01-23 2024-07-23 Qorvo Us, Inc. RF devices with enhanced performance and methods of forming the same
US12057374B2 (en) 2019-01-23 2024-08-06 Qorvo Us, Inc. RF devices with enhanced performance and methods of forming the same
US12046570B2 (en) * 2019-01-23 2024-07-23 Qorvo Us, Inc. RF devices with enhanced performance and methods of forming the same
US12074086B2 (en) 2019-11-01 2024-08-27 Qorvo Us, Inc. RF devices with nanotube particles for enhanced performance and methods of forming the same
US11646289B2 (en) 2019-12-02 2023-05-09 Qorvo Us, Inc. RF devices with enhanced performance and methods of forming the same
US11923238B2 (en) 2019-12-12 2024-03-05 Qorvo Us, Inc. Method of forming RF devices with enhanced performance including attaching a wafer to a support carrier by a bonding technique without any polymer adhesive
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Also Published As

Publication number Publication date
KR20000028811A (en) 2000-05-25
IL131930A0 (en) 2001-03-19
EP0993238A1 (en) 2000-04-12
CN1256300A (en) 2000-06-14
FR2784261A1 (en) 2000-04-07
FR2784261B1 (en) 2001-07-27
JP2000123635A (en) 2000-04-28

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