CN101789594A - Overvoltage protector for working condition of supernormal centrifugal acceleration - Google Patents
Overvoltage protector for working condition of supernormal centrifugal acceleration Download PDFInfo
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- CN101789594A CN101789594A CN 201010131988 CN201010131988A CN101789594A CN 101789594 A CN101789594 A CN 101789594A CN 201010131988 CN201010131988 CN 201010131988 CN 201010131988 A CN201010131988 A CN 201010131988A CN 101789594 A CN101789594 A CN 101789594A
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- Prior art keywords
- overvoltage protector
- centrifugal acceleration
- insulating material
- overvoltage
- working condition
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Abstract
The invention relates to an overvoltage protector for a working condition of a supernormal centrifugal acceleration, comprising a varistor which is packaged in an overvoltage protector shell and adopts a zinc oxide varistor, and flexible insulating material is filled between the overvoltage protector shell and the zinc oxide varistor. The flexible insulating material is flexible solid-state epoxy cloth, synthetic silicon rubber and polymer polyethylene. The overvoltage protector shell is an insulating body and is molded by high-strength DMC insulating material. By adopting the structure of coupling hardness with softness, the overvoltage protector can bear the centrifugal acceleration of 6,000g without damage, can effectively operate for a long term under the working condition of the centrifugal acceleration of 4,800g, can reduce the product usage quantity and product volume under the same energy requirement, has unlimited discharging capability and can be used for a motor with various exciting current parameters.
Description
Technical field
Patent of the present invention relates to a kind of over-pressure safety device that is applied to extraordinary acceleration operating mode, especially can be under great acceleration operating mode the operation of safety, can the security limitations overvoltage, absorb the overvoltage energy insulation of protected equipment be without prejudice.It is a kind of electric protection device.
Background technology
Now, the use occasion of synchronous machine is extensive especially, as the main air blower of the pressurizing point on the natural gas transport circuit, metallurgy industry and the pumping plant of municipal works etc., the excitation rectifying power supply apparatus of these motors all is mounted in the epitrochanterian of high speed rotating, and its acceleration ranges up to 6000g (promptly the object of 1 gram mass will produce 6 kilograms pressure under this acceleration).The overvoltage energy that is produced when the commutation overvoltage of excitation rectifier power source and step-out all will cause rectifier cell to puncture damage; must protect it in order to protect the rectifier power source element to be without prejudice, its best protective device is exactly the protection product with pressure limiting and energy-absorbing.
At present, to have over-pressure safety device under the extraordinary acceleration operating mode all be to adopt single series-parallel mode to be installed on the rotating disk being used in high speed rotating.The domestic producer that do not manufacture, everybody uses and all to depend on import, is metal shell and the overvoltage protector of import adopts, and overall dimension is big, brings a lot of inconveniences to use on the insulating space of installing is handled.In addition, existing product adopts mould pressing process, frock technology and pouring technology manufacturing nothing but.
The pressure that mould pressing process is produced in mold process will be transmitted on its core parts SIC resistance, will produce potential injury to the SIC element, and the pressure that extraordinary in addition centrifugal acceleration produces will cause protector to damage.
Adopt the overvoltage protector of frock explained hereafter; because it is that a plurality of unit constructions form, the quality of itself is uncontrollable, is contained in to have under the extraordinary centrifugal acceleration operating mode; certainly will cause the whole machine balancing of synchronous machine out of hand, this is that all motor operations never allow.
The technology that adopts the epoxy insulation material to pour into a mould, and epoxy casting may produce insulation to the contact-making surface of piezo-resistance and extraction electrode, influence its electric property, this technology can be applied on the static product processes, and be unscientific to the product that runs on extraordinary centrifugal acceleration operating mode, because the epoxy insulation material cracking phenomena can occur under vibrations and action of centrifugal force, thereby causes the internal core element to make moist and lost efficacy.So there is following problems in existing product:
1, Nei Bu protection component is the SiC piezo-resistance, and the SiC piezo-resistance has the restriction of electric current and temperature rise in the use, and when temperature surpasses 150K, this protective device will damage inefficacy, and electric current reaches and also will take place about 200 amperes to collapse and lose its protective effect.
2, the protective device quality is big, because centrifugal force is also very big to the pressure that protective device itself is produced, causes inner SiC piezo-resistance stressed and damage easily under very high acceleration situation.
3, this product is string and uses; and SIC resistance is the single-point current-sharing, can't guarantee the equal energy of current-sharing of each protector of a whole set of products under the various operating modes of actual motion, thereby the heavy damage earlier of certain protector load takes place easily; finally cause all protectors to damage, have an accident.
Summary of the invention
At above-mentioned problems of the prior art; the object of the present invention is to provide a kind of overvoltage protector that is applied to extraordinary acceleration operating mode; this overvoltage protector can tolerate the high temperature of 200 degree; it is big to hold density; under equal energy requirement, can reduce the usage quantity and the small product size of product; through-current capability is unrestricted, can be used in the motor of various exciting current parameters.
The technical scheme that the present invention is taked for its purpose of realization is: a kind of overvoltage protector that is applied to extraordinary centrifugal acceleration operating mode; comprise piezo-resistance; be packaged in the overvoltage protector housing, described piezo-resistance adopts zinc oxide (ZnO) piezo-resistance, as the core parts of overvoltage protector.Between overvoltage protector housing and described Zinc-oxide piezoresistor, adopt the flexible insulating material filling.Described flexible insulating material is flexible solid-state epoxy cloth, silastic elastomer or high-molecular polythene.Described overvoltage protector housing is an insulator, adopts high strength DMC insulating material mould to close and forms.
The present invention utilizes the low residual voltage of this piezo-resistance of ZnO varistor of high energy low field intensity and characteristic that greatly can capacity; when overvoltage that commutation overvoltage and step-out produced appears in the rectifier power source of synchronous machine; this protector is just in the quick acting of microsecond time; with the overvoltage energy absorption that system produced; simultaneously the overvoltage amplitude limitation under the insulation tolerance level of rectifier power source, thereby realize protecting fast the purpose of motor safety.
Beneficial effect of the present invention:
1, can under the centrifugal acceleration operating mode of 4800g, move with security and stability, under the centrifugal acceleration of 6000g, not damage.
2, through-current capability is unrestricted, can be used in the motor of various exciting current parameters.
3, because core parts body heatproof characteristic can tolerate 200 high temperature of spending.
4, high energy low field intensity Zinc-oxide piezoresistor can be from recovering in action, and pressure-sensitively do not reduce, because of the Zinc-oxide piezoresistor that adopts the high energy low field intensity as the core protection component.
5, residual voltage ratio is little, and action back residual voltage is low, and protection range is wide, goes for different insulating requirements protection occasions.
6 to hold density big, can reduce the usage quantity and the small product size of product under equal energy requirement, saves use cost, and ageing resistance is good, long service life.
Description of drawings
The present invention is further described below in conjunction with the drawings and specific embodiments.
Fig. 1 is a structural representation of the present invention.
Among the figure 1, zinc oxide (ZnO) piezo-resistance, 2, flexible insulating material, 3, electrode, 4, fixed lever, 5, the overvoltage protector housing.
Embodiment
Referring to Fig. 1, the present invention adopts zinc oxide (ZnO) piezo-resistance, and this resistance has high energy low field intensity characteristic, the ability of its electric current is unrestricted, and action back residual voltage is low, and energy-absorbing effect is good, be the microsecond level operate time, and its high temperature that can tolerate 200 degree does not damage.Overvoltage protector housing 5 is an insulator, adopts high strength DMC insulating material mould to close and forms.In zinc oxide (ZnO) piezo-resistance 1 is encapsulated in pressure protector housing 5; filler flexible insulating material 2 adopts flexible solid-state epoxy cloth therebetween; as built-in electrical insulation; this material antiageing effect is good; the heatproof characteristic can be born the high temperature of 300 degree by force, has very high intensity again simultaneously, can protect core parts not to be subjected to the injury of external force effectively under extraordinary centrifugal acceleration; dielectric strength is that general epoxy material is incomparable, also can adopt silastic elastomer or high-molecular polythene.Zinc oxide (ZnO) piezo-resistance 1 connects on the two end electrodes 3.Electrode 3 electrical conductivity height can guarantee fully contacting of electrode and core parts, make this product that conducting rapidly under the superpotential situation arranged, and carry out pressure limiting energy-absorbing protection effectively.Fixed lever 4 adopts the magnetism-free stainless steel material, guarantees installation strength.Each part quality error in the foregoing description will be strict controlled in the prescribed limit, to guarantee a plurality of connection in series-parallel of protector the harmony on the motor rotating disk is installed.
The present invention adopts " hard and soft " camera Ji structure, and the centrifugal acceleration that makes this invention product can bear 6000g is not damaged.Operation that can be permanently effective under the centrifugal acceleration operating mode of 4800g.Entire product adopts the modularization production technology, guarantees the quality conformance of product of the present invention.Adopt all methods of energy of current-sharing completely, make to be contained in same the endergonic consistency of the protector on the motor, can not take place to damage the phenomenon that causes global failure because of certain protector.
Protection philosophy of the present invention is: the present invention draws by the electrode at two ends; receive the rectifier power source of synchronous machine; when commutation overvoltage and step loss condition appear in rectifier power source; the rapid conducting of high energy low field intensity Zinc-oxide piezoresistor; absorb the overvoltage energy; the amplitude of over-voltage preserves from thereby reach the protection rectifier power source, guarantees the motor safety reliability service.
Claims (3)
1. overvoltage protector that is applied to extraordinary centrifugal acceleration operating mode; comprise piezo-resistance; be packaged in the overvoltage protector housing; it is characterized in that described piezo-resistance adopts Zinc-oxide piezoresistor, between overvoltage protector housing and described Zinc-oxide piezoresistor, adopt the flexible insulating material filling.
2. the overvoltage protector that is applied to extraordinary centrifugal acceleration operating mode according to claim 1 is characterized in that described flexible insulating material is flexible solid-state epoxy cloth, silastic elastomer or high-molecular polythene.
3. the overvoltage protector that is applied to extraordinary centrifugal acceleration operating mode according to claim 1 is characterized in that described overvoltage protector housing is an insulator, adopts high strength DMC insulating material mould to close and forms.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010131988 CN101789594A (en) | 2010-03-23 | 2010-03-23 | Overvoltage protector for working condition of supernormal centrifugal acceleration |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010131988 CN101789594A (en) | 2010-03-23 | 2010-03-23 | Overvoltage protector for working condition of supernormal centrifugal acceleration |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101789594A true CN101789594A (en) | 2010-07-28 |
Family
ID=42532701
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201010131988 Pending CN101789594A (en) | 2010-03-23 | 2010-03-23 | Overvoltage protector for working condition of supernormal centrifugal acceleration |
Country Status (1)
| Country | Link |
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| CN (1) | CN101789594A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3737725A (en) * | 1971-11-08 | 1973-06-05 | Aviat Corp | Circuit overvoltage protector |
| CN2035920U (en) * | 1988-09-21 | 1989-04-12 | 杨季民 | Composite fuse cutout |
| CN2223866Y (en) * | 1994-05-17 | 1996-04-03 | 朱建定 | Four-in-one type phase-lost protective switch for motor |
| CN2580621Y (en) * | 2002-10-29 | 2003-10-15 | 北京国电四维电力技术有限公司 | Prefabricated dry cable terminal |
| CN201733084U (en) * | 2010-03-23 | 2011-02-02 | 安徽时代科聚电气有限公司 | Overvoltage protector applied to supernormal centrifugal acceleration working condition |
-
2010
- 2010-03-23 CN CN 201010131988 patent/CN101789594A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3737725A (en) * | 1971-11-08 | 1973-06-05 | Aviat Corp | Circuit overvoltage protector |
| CN2035920U (en) * | 1988-09-21 | 1989-04-12 | 杨季民 | Composite fuse cutout |
| CN2223866Y (en) * | 1994-05-17 | 1996-04-03 | 朱建定 | Four-in-one type phase-lost protective switch for motor |
| CN2580621Y (en) * | 2002-10-29 | 2003-10-15 | 北京国电四维电力技术有限公司 | Prefabricated dry cable terminal |
| CN201733084U (en) * | 2010-03-23 | 2011-02-02 | 安徽时代科聚电气有限公司 | Overvoltage protector applied to supernormal centrifugal acceleration working condition |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Open date: 20100728 |