CN105845524B - A kind of arc extinguishing exhaust system of miniature circuit breaker - Google Patents
A kind of arc extinguishing exhaust system of miniature circuit breaker Download PDFInfo
- Publication number
- CN105845524B CN105845524B CN201610375236.2A CN201610375236A CN105845524B CN 105845524 B CN105845524 B CN 105845524B CN 201610375236 A CN201610375236 A CN 201610375236A CN 105845524 B CN105845524 B CN 105845524B
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- China
- Prior art keywords
- arc
- exhaust
- baffle
- extinguishing
- partition
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- 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.)
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/30—Means for extinguishing or preventing arc between current-carrying parts
- H01H9/34—Stationary parts for restricting or subdividing the arc, e.g. barrier plate
- H01H9/36—Metal parts
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H73/00—Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism
- H01H73/02—Details
- H01H73/18—Means for extinguishing or suppressing arc
Landscapes
- Arc-Extinguishing Devices That Are Switches (AREA)
- Breakers (AREA)
Abstract
The present invention relates to a kind of low-voltage circuit terminal appliance, the arc extinguishing exhaust system of specially a kind of miniature circuit breaker.The present invention adopts the following technical scheme that, a kind of arc extinguishing exhaust system of miniature circuit breaker, it is characterised in that：It is provided with intermediate bulkhead between the pedestal and upper cover and positioned at the exhaust ports of arc-chutes, air exit is arranged to two respectively first exhaust outlet and second exhausts up and down and exported by intermediate bulkhead, it is respectively arranged with first partition and second partition between the intermediate bulkhead and pedestal and upper cover, first partition and second partition are respectively close to the outlet of corresponding first exhaust and second exhaust outlet setting, first exhaust straight slot and second exhaust straight slot are respectively arranged in the first partition and second partition, by using said program, the present invention overcomes the shortcomings of the prior art, it is good to provide a kind of space layout, arc extinguishing good exhaust effect, it will not the arc extinguishing exhaust system of novel miniature circuit breaker that bursts of sounding.
Description
Technical field
The present invention relates to a kind of low-voltage circuit terminal appliance, the arc extinguishing exhaust system of specially a kind of miniature circuit breaker.
Background technology
Present breaker arc baffle only two parts up and down, opening or the slot setting of arc baffle with arc-chutes among
Position is corresponding, and when disjunction, ionized gas and electric arc are discharged among arc-chutes, and both sides arc extinguishing is uneven up and down for arc-chutes, electricity
Because of one exhaust outlet of surge chamber or two exhaust outlets, two surge chambers there are one only but pressure is inconsistent makes after being discharged from gas
It is big at interiors of products local pressure and product is caused to burst phenomenon, and charged particle and gas are restriked phenomenon in surge chamber,
Or have electric arc or charged particle when discharge, influence equipment personnel safety.And product breaking capacity is low, arranges unreasonable, body
Product is big.
Invention content
The present invention overcomes the shortcomings of the prior art, and it is good to provide a kind of space layout, arc extinguishing good exhaust effect, Bu Huifa
The arc extinguishing exhaust system of the raw novel miniature circuit breaker burst.
Realize that above-mentioned purpose, the present invention adopt the following technical scheme that, a kind of arc extinguishing exhaust system of miniature circuit breaker, including
There are pedestal, arc-chutes and upper cover, it is characterised in that：It is provided between the pedestal and upper cover and positioned at the exhaust ports of arc-chutes
Intermediate bulkhead, exhaust outlet is arranged to two respectively first exhaust outlet and second exhausts up and down and exported by intermediate bulkhead, described
First partition and second partition are respectively arranged between intermediate bulkhead and pedestal and upper cover, first partition and second partition paste respectively
Nearly corresponding first exhaust outlet and second exhaust outlet are arranged, and first is respectively arranged on the first partition and second partition
It is vented straight slot and second exhaust straight slot, the first buffering is provided between the intermediate bulkhead and upper cover and after first partition
Room is provided with first exhaust passage below the first surge chamber, is set after being located at second partition between the intermediate bulkhead and pedestal
It is equipped with the second surge chamber, the side of the second surge chamber is provided with the second buffer channel.
By using said program, the present invention can be very good the high temperature and high pressure gas after arc-chutes by two
Surge chamber is described to be exaggerated cushion space as far as possible in breaker since two surge chambers are at spatial arrangement into row buffering,
Very effective that internal only space is utilized in breaker, other two surge chamber is respectively arranged with corresponding exhaust outlet,
Such good exhaust effect, and reduce the pressure in product.
The further setting of the present invention is：The intermediate bulkhead is located at the setting of upper cover side and is arranged at intervals with pillar, adjacent
Pillar forms groove, and boss is arranged at intervals on the upper lid, and adjacent lands form groove, and pillar is shifted to install with boss, convex
The top of column contradicts in the groove between adjacent lands, and the top of boss contradicts in the groove between adjacent pillar, each recessed
The top of slot is contradicted block after form the first exhaust straight slot of Heterogeneous Permutation, first exhaust straight slot is located on the intermediate bulkhead
After be provided with catch, the baffle interspersed with catch overlapping is provided on the upper lid, catch forms baffle wall with baffle fit, the
The first surge chamber is constituted between one exhaust straight slot and baffle wall, baffle wall is provided with relative to the other side of the first surge chamber for disconnected
The installation cavity of road device connecting terminal placement.
By using said program, the structure of first exhaust straight slot can be made more reasonable, made between adjacent exhaust straight slot
Distance increase, can be very good to prevent divided electric arc to be reunited to be formed and damage breaker compared with long arc in this way
Internal components.It finally can be very good to protect connecting terminal not by arc through or scaling loss.
The present invention further setting be：It is arranged at intervals with long pillar on the pedestal, is formed between adjacent long pillar
Long recess, the top of long pillar contradicts to make groove form second exhaust straight slot on intermediate bulkhead, on the intermediate bulkhead
It is provided with through-hole, which makes the first surge chamber and the second surge chamber penetrate through setting.First surge chamber and the perforation of the second surge chamber
Setting makes the first surge chamber and the second surge chamber free flow of gas, to make the first surge chamber buffer chamber pressure phase with second
Deng avoiding two bufferings, chamber pressure is unequal causes local pressure excessive and burst phenomenon.
By using said program, makes to be also equipped at second exhaust and can be very good to prevent divided electric arc from tying again
It is combined the exhaust straight slot to be formed and damage circuit breaker internal device compared with long arc.
The present invention further setting be：It is arranged at intervals with long pillar on the pedestal, is formed between adjacent long pillar
Long recess, the top of long pillar contradicts to make groove form second exhaust straight slot on intermediate bulkhead plate, on the pedestal
First and second two rows of arc baffles, the top of two rows of arc baffles are provided in second surge chamber and after second exhaust port
It contradicts and is arranged with the side of intermediate bulkhead respectively, between two rows of arc baffle-plate misplacement settings and two rows of arc baffles there are one tools
It is spaced, metal arc chute is provided at the interval location of the two rows arc baffles, be provided on metal arc chute small logical
Hole.
By using said program, it can be very good to allow the electric arc by second exhaust straight slot again by first and second liang
Arc baffle and the segmentation of metal arc chute are arranged, while making internal arc and charging the steady decrease of gas, substantially may be used in this way
Also to decline much the temperature of arc extinction, gas, can be very good to prevent gas thermal breakdown and arc reignition is caused to cause
Product explosion accident.
The present invention it is last be arranged be：The first row extinguishing arc baffle is arranged close to second exhaust straight slot, the second row
Two panels extinguishing arc baffle extends setting to extinguishing arc baffle up and down, the both ends of the metal arc chute by second row extinguishing arc baffle above and below
The extension of two panels extinguishing arc baffle is limited, the roads Pao Hu between the first row extinguishing arc baffle and second row extinguishing arc baffle it
The roads Jian Paohu shift to install, and the region perforation of the installation buckle releaser of second surge chamber and breaker is arranged.
By using said program, the installation of metal arc chute can be made to become convenient, in addition the first row extinguishing arc
The roads Pao Hu between the roads Pao Hu between baffle and second row extinguishing arc baffle shift to install, second surge chamber and breaker
The region perforation setting of buckle releaser is installed, such purpose keeps subdividing the arc effect more preferable, in addition just in case the second buffering is indoor
High temperature and high pressure gas pressure is excessively high, can be very good the region of installation buckle releaser for making gas enter breaker in this way.To drop
Low pressure improves electric arc or electrification gas exit velocity.
The present invention is described further below in conjunction with the accompanying drawings.
Description of the drawings
Fig. 1 is that the embodiment of the present invention reflects structure chart of the intermediate bulkhead towards upper cover side and arc-chutes cooperation；
Fig. 2 is the structure chart of reflection pedestal of the embodiment of the present invention and arc-chutes cooperation；
Fig. 3 is the stereogram of metal arc chute of the embodiment of the present invention；
Fig. 4 is reflection stereogram of the intermediate bulkhead towards upper cover side of the embodiment of the present invention；
Fig. 5 is reflection stereogram of the intermediate bulkhead towards pedestal side of the embodiment of the present invention；
Fig. 6 is the stereogram of upper cover of the embodiment of the present invention；
Fig. 7 is the stereogram of pedestal of the embodiment of the present invention；
Fig. 8 is the phantom of reflection metal arc chute of the embodiment of the present invention；
Fig. 9 is the phantom of reflection intermediate bulkhead through-hole of the embodiment of the present invention.
Specific implementation mode
As shown in Fig. 1-Fig. 9, a kind of arc extinguishing exhaust system of miniature circuit breaker includes pedestal 1, arc-chutes 2 and upper cover
3, in the present embodiment, it is provided with intermediate bulkhead 4 between the pedestal 1 and upper cover 2 and at the exhaust outlet 21 of arc-chutes 2,
Exhaust outlet is arranged to two respectively first exhaust outlets 211 and second exhaust outlet 212 up and down by intermediate bulkhead 4, in described
It is both provided between spacing board 4 and pedestal 1 and upper cover 3 and is respectively arranged with first partition 5 and second partition 6, first partition 5 and
Two partition boards 6 are respectively close to 212 setting of corresponding first exhaust outlet 211 and second exhaust outlet, the first partition 5 and second
First exhaust straight slot 51 and second exhaust straight slot 61 are respectively arranged on partition board 6, between the intermediate bulkhead 4 and upper cover 3 and position
The first surge chamber 7 is provided with after first partition 5, the lower section of the first surge chamber 7 is provided with first exhaust passage 71, the centre
It is provided with the second surge chamber 8 after being located at second partition 6 between partition board 4 and pedestal 1, the side of the second surge chamber 8 is provided with second
Exhaust passage 81.By using said program, the present invention can be very good the high temperature and high pressure gas after arc-chutes 2 to pass through
Two surge chambers are described to be exaggerated buffering as far as possible in breaker since two surge chambers are at spatial arrangement into row buffering
Space, very effective that internal only space is utilized in breaker, other two surge chamber is respectively arranged with corresponding row
Gas port, such good exhaust effect.
In embodiments of the present invention, the intermediate bulkhead 4 be located at 3 side of upper cover setting be arranged at intervals with pillar 41, it is adjacent
Pillar 41 forms groove 42, is arranged at intervals with boss 31 in the upper cover 3, and adjacent lands 31 form groove 32, pillar 41 with it is convex
Platform 31 shifts to install, and the top of pillar 41 contradicts in the groove 32 between adjacent lands 31, and the top of boss 31 is contradicted in phase
In groove 42 between adjacent pillar 41, the top of each groove 32,42 is contradicted block after form the first exhaust of Heterogeneous Permutation and lead to
Slot 51 is provided with catch 43 after being located at first exhaust straight slot 211 on the intermediate bulkhead 4, is provided in the upper cover 3 and catch
The interspersed baffle 33 of 43 overlappings, catch 43 cooperatively form baffle wall, structure between first exhaust straight slot 51 and baffle wall with baffle 33
At the first surge chamber 7, baffle wall is provided with the installation disposed for breaker connecting terminal relative to the other side of the first surge chamber 7
Chamber 44；By using said program, the structure of first exhaust straight slot 51 can be made more reasonable, made between adjacent exhaust straight slot 51
Distance increase, can be very good to prevent divided electric arc from damaging breaker compared with long arc from new be combined together to form in this way
Internal components.It finally can be very good that connecting terminal is protected not struck off by electric arc.
In embodiments of the present invention, it is arranged at intervals with long pillar 11 on the pedestal 1, length is formed between adjacent long pillar 11
Groove 12, the top of long pillar 11 contradict on intermediate bulkhead 4 to make groove 12 form second exhaust straight slot 61, make the in this way
It is also equipped at two exhausts and can be very good to prevent divided electric arc to be combined together to form from newly compared with long arc, the centre
Through-hole 45 is provided on partition board 4, which makes the first surge chamber 7 and the second surge chamber 8 penetrate through setting, is conducive to two in this way
The pressure of surge chamber is identical.Prevent buffering from causing to burst due to product local pressure is big because of pressure imbalance.
In embodiments of the present invention, it is arranged in the second surge chamber 8 on the pedestal 1 and after second exhaust port 212
There are first and second two rows of arc baffles 13,14, the side of the tops of two rows of arc baffles 13,14 respectively with intermediate bulkhead 4 is supported
Setting is touched, two rows of arc baffles 13,14 shift to install and the interval between two rows of arc baffles 13,14 there are one tools, and described two
It is provided with metal arc chute 15 at the interval location of row's arc baffle 13,14, small through hole is provided on metal arc chute 15；
By using said program, it can be very good to allow the electric arc by second exhaust straight slot 61 again by first and second two rows of arcs
Baffle 13,14 and metal arc chute 15 are divided, while making internal arc and charging the steady decrease of gas, substantially may be used in this way
Also to decline much the temperature of arc extinction, gas, can be very good to prevent arc reignition and make product explosion accident.
In embodiments of the present invention, the first row extinguishing arc baffle 13 is arranged close to second exhaust straight slot 61, and described second
It arranges about 14 two panels extinguishing arc baffle 141 of extinguishing arc baffle and extends setting, the both ends of the metal arc chute 15 are disappeared by second row
The extension of about 14 two panels extinguishing arc baffle 141 of arc baffle is limited, the roads Pao Hu between the first row extinguishing arc baffle 13
The roads Pao Hu between second row extinguishing arc baffle 14 shift to install, and purpose is arranged in this way keeps subdividing the arc effect more preferable, and described the
The perforation of region 9 of two surge chambers 8 and the installation buckle releaser of breaker is arranged, and can be very good that gas is made to enter breaker in this way
The region of installation buckle releaser avoids product from bursting to reduce pressure, improves the electric arc velocity of discharge, improves breaking capacity.
Claims (6)
1. a kind of arc extinguishing exhaust system of miniature circuit breaker includes pedestal, arc-chutes and upper cover, it is characterised in that：The bottom
It is provided with intermediate bulkhead between seat and upper cover and positioned at the exhaust ports of arc-chutes, exhaust outlet is arranged to upper and lower two by intermediate bulkhead
A is respectively first exhaust outlet and second exhaust outlet, and first is respectively arranged between the intermediate bulkhead and pedestal and upper cover
Partition board and second partition, first partition and second partition are set close to the outlet of corresponding first exhaust and second exhaust outlet respectively
It sets, first exhaust straight slot and second exhaust straight slot, the intermediate bulkhead is respectively arranged in the first partition and second partition
It is provided with the first surge chamber between upper cover and after first partition, it is logical that first exhaust is provided with below the first surge chamber
Road is provided with the second surge chamber, the side setting of the second surge chamber after being located at second partition between the intermediate bulkhead and pedestal
There are the second buffer channel, the intermediate bulkhead to be located at the setting of upper cover side and be arranged at intervals with pillar, adjacent pillar forms groove, institute
It states and is arranged at intervals with boss on lid, adjacent lands form groove, and pillar is shifted to install with boss, and the top of pillar is contradicted in phase
In groove between adjacent boss, the top of boss contradicts in the groove between adjacent pillar, and the top of each groove, which is contradicted, to be blocked up
It is honored as a queen to form the first exhaust straight slot of Heterogeneous Permutation, is provided with catch after being located at first exhaust straight slot on the intermediate bulkhead, institute
It states to be provided on lid and overlaps interspersed baffle with catch, catch forms baffle wall, first exhaust straight slot and screening with baffle fit
The first surge chamber is constituted between barricade, baffle wall is provided with relative to the other side of the first surge chamber pacifies for breaker connecting terminal
The installation cavity set.
2. the arc extinguishing exhaust system of miniature circuit breaker according to claim 1, it is characterised in that：Interval is set on the pedestal
It is equipped with long pillar, forms long recess between adjacent long pillar, the top of long pillar contradicts on intermediate bulkhead to make groove type
At second exhaust straight slot, it is provided with through-hole on the intermediate bulkhead, which makes the first surge chamber and the perforation of the second surge chamber set
It sets.
3. the arc extinguishing exhaust system of miniature circuit breaker according to claim 1, it is characterised in that：Interval is set on the pedestal
It is equipped with long pillar, forms long recess between adjacent long pillar, the top of long pillar contradicts on intermediate bulkhead plate to make groove
Second exhaust straight slot is formed, first and second liang are provided in the second surge chamber on the pedestal and after second exhaust port
Arc baffle is arranged, the top of two rows of arc baffles is contradicted with the side of intermediate bulkhead respectively to be arranged, and two rows of arc baffle-plate misplacements are set
Interval is set and is had between two rows of arc baffles, metal arc chute is provided at the interval location of the two rows arc baffle,
It is provided with small through hole on metal arc chute.
4. the arc extinguishing exhaust system of miniature circuit breaker according to claim 1, it is characterised in that：Second on the pedestal
First and second two rows of arc baffles, the top difference of two rows of arc baffles are provided in surge chamber and after second exhaust port
It contradicts and is arranged with the side of intermediate bulkhead, there is interval between two rows of arc baffle-plate misplacement settings and two rows of arc baffles, it is described
It is provided with metal arc chute at the interval location of two rows of arc baffles, is provided with small through hole on metal arc chute, described
One row's extinguishing arc baffle is arranged close to second exhaust straight slot.
5. the arc extinguishing exhaust system of miniature circuit breaker according to claim 3, it is characterised in that：The first row extinguishing arc gear
Plate is arranged close to second exhaust straight slot, and two panels extinguishing arc baffle extends setting to the second row extinguishing arc baffle up and down, and the metal disappears
The both ends of arc partition board are limited by the extension of two panels extinguishing arc baffle above and below second row extinguishing arc baffle, the first row extinguishing arc
The roads Pao Hu between the roads Pao Hu between baffle and second row extinguishing arc baffle shift to install, second surge chamber and breaker
The region perforation setting of buckle releaser is installed.
6. the arc extinguishing exhaust system of miniature circuit breaker according to claim 4, it is characterised in that：The first row extinguishing arc gear
Plate is arranged close to second exhaust straight slot, and two panels extinguishing arc baffle extends setting to the second row extinguishing arc baffle up and down, and the metal disappears
The both ends of arc partition board are limited by the extension of two panels extinguishing arc baffle above and below second row extinguishing arc baffle, the first row extinguishing arc
The roads Pao Hu between the roads Pao Hu between baffle and second row extinguishing arc baffle shift to install, second surge chamber and breaker
The region perforation setting of buckle releaser is installed.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610375236.2A CN105845524B (en) | 2016-05-31 | 2016-05-31 | A kind of arc extinguishing exhaust system of miniature circuit breaker |
| PCT/CN2017/077955 WO2017206578A1 (en) | 2016-05-31 | 2017-03-24 | Arc extinguishing exhaust system for miniature circuit breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610375236.2A CN105845524B (en) | 2016-05-31 | 2016-05-31 | A kind of arc extinguishing exhaust system of miniature circuit breaker |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105845524A CN105845524A (en) | 2016-08-10 |
| CN105845524B true CN105845524B (en) | 2018-09-07 |
Family
ID=56595457
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610375236.2A Active CN105845524B (en) | 2016-05-31 | 2016-05-31 | A kind of arc extinguishing exhaust system of miniature circuit breaker |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN105845524B (en) |
| WO (1) | WO2017206578A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105845524B (en) * | 2016-05-31 | 2018-09-07 | 乐清市也为电气有限公司 | A kind of arc extinguishing exhaust system of miniature circuit breaker |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1498411A (en) * | 2001-03-20 | 2004-05-19 | 莫勒自动***公司 | Housing for switching device |
| CN102013365A (en) * | 2011-01-07 | 2011-04-13 | 上海诺雅克电气有限公司 | Arc control device of circuit breaker |
| CN204257458U (en) * | 2014-11-13 | 2015-04-08 | 杭州泰姆电气有限公司 | Arc extinguishing system of circuit breaker |
| CN205657037U (en) * | 2016-05-31 | 2016-10-19 | 乐清市也为电气有限公司 | Miniature circuit breaker's arc extinguishing exhaust system |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3997746A (en) * | 1974-04-23 | 1976-12-14 | Airpax Electronics, Incorporated | Circuit breaker with arc chamber screen |
| DE3621165A1 (en) * | 1985-07-09 | 1987-01-22 | Mitsubishi Electric Corp | ARC EXTINGUISHING DEVICE |
| JP2003346635A (en) * | 2002-05-28 | 2003-12-05 | Mitsubishi Electric Corp | Circuit breaker |
| DE102009056190B3 (en) * | 2009-11-27 | 2011-05-12 | Abb Ag | Arc quenching device and switching device |
| CN103426670B (en) * | 2013-09-02 | 2015-06-24 | 浙江大华电气有限公司 | Breaker contact arc extinguishing system |
| CN204189738U (en) * | 2014-11-13 | 2015-03-04 | 杭州泰姆电气有限公司 | Circuit breaker |
| CN105845524B (en) * | 2016-05-31 | 2018-09-07 | 乐清市也为电气有限公司 | A kind of arc extinguishing exhaust system of miniature circuit breaker |
-
2016
- 2016-05-31 CN CN201610375236.2A patent/CN105845524B/en active Active
-
2017
- 2017-03-24 WO PCT/CN2017/077955 patent/WO2017206578A1/en active Application Filing
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1498411A (en) * | 2001-03-20 | 2004-05-19 | 莫勒自动***公司 | Housing for switching device |
| CN102013365A (en) * | 2011-01-07 | 2011-04-13 | 上海诺雅克电气有限公司 | Arc control device of circuit breaker |
| CN204257458U (en) * | 2014-11-13 | 2015-04-08 | 杭州泰姆电气有限公司 | Arc extinguishing system of circuit breaker |
| CN205657037U (en) * | 2016-05-31 | 2016-10-19 | 乐清市也为电气有限公司 | Miniature circuit breaker's arc extinguishing exhaust system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105845524A (en) | 2016-08-10 |
| WO2017206578A1 (en) | 2017-12-07 |
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Effective date of registration: 20230518 Address after: No. 7 Zhenxing Road, Liushi Town, Leqing City, Wenzhou City, Zhejiang Province, 325604 Patentee after: WENZHOU AOELEC ELECTRICAL CO.,LTD. Address before: Donghuangyu Village, Liushi Town, Yueqing City, Wenzhou City, Zhejiang Province, 325000 Patentee before: Yueqing Yewei Electric Co.,Ltd. |
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