CN105490430A - Quickly-mounted motor - Google Patents
Quickly-mounted motor Download PDFInfo
- Publication number
- CN105490430A CN105490430A CN201510868764.7A CN201510868764A CN105490430A CN 105490430 A CN105490430 A CN 105490430A CN 201510868764 A CN201510868764 A CN 201510868764A CN 105490430 A CN105490430 A CN 105490430A
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- CN
- China
- Prior art keywords
- fan housing
- bearing
- annular
- ring
- impeller
- 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.)
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/10—Casings or enclosures characterised by the shape, form or construction thereof with arrangements for protection from ingress, e.g. water or fingers
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/16—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/20—Casings or enclosures characterised by the shape, form or construction thereof with channels or ducts for flow of cooling medium
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention discloses a quickly-mounted motor. The quickly-mounted motor comprises an inducer, an impeller, a fan housing, a main case, a carbon brush, a rotor, a stator and a rotary shaft, wherein an inner bearing and an outer bearing are arranged on the rotary shaft; a bearing matching groove is formed in the inducer; the inner bearing is positioned in the bearing matching groove; the rotary shaft is connected with the inner ring of the inner bearing; the rotary shaft is connected with the inner ring of the outer bearing; the outer ring of the inner bearing and the inner side wall of the bearing matching groove are arranged in a mutual compressing manner; the outer ring of the outer bearing is connected with the main case; a plurality of case positioning holes are formed in the main case; the inducer is provided with multiple positioning columns; the positioning columns pass through the corresponding case positioning holes; and the fan housing and the main case are tightly clamped. The quickly-mounted motor has the beneficial effects that the main case and the fan housing are in direct tight fit, and the main case and the fan housing are guided and positioned through the positioning columns, so that the motor is mounted rapidly and conveniently, and high in matching precision; an extra bracket structure is not required; and the bearing is directly arranged in the bearing matching groove in the inducer, so that the accumulative error is reduced, the assembling precision is improved and the overall cost is greatly lowered.
Description
Technical field
The invention belongs to technical field of motors, particularly relate to a kind of quick-mounting motor.
Background technology
Motor has been widely used and has applied in production instantly, life.In general, motor comprises stator, rotor, movable vane wheel, determines the required structure such as impeller (inducer), casing, fan housing, and wherein fan housing, casing need to assemble, and the rotating shaft of rotor also needs to carry out auxiliary support by bearing.Current motor, the mode of screw assembling that adopts connects more, also adopts the form of extra brackets to install with the bearing of rotor engagement.Although these modes can realize assembling, the complexity of structure improves, and becomes many due to structure, and precision also can correspondingly decline (accumulated error become large).
Summary of the invention
The present invention is to overcome deficiency of the prior art, provides a kind of rationally simple for structure, and location, assembly precision are high, effectively can realize location, assembling fast, the motor that integrated connection is good, stability is secure.
To achieve these goals, the present invention is by the following technical solutions:
A kind of quick-mounting motor, comprise inducer, movable vane is taken turns, fan housing, casing, described inducer, movable vane wheel is within fan housing, also comprise carbon brush, rotor, stator, the rotating shaft be connected with rotor coaxial, described rotating shaft is provided with inner bearing, outer bearing, bearing fit groove is provided with in the middle part of described inducer, described bearing fit groove is coaxial with inducer, described inner bearing is in bearing fit groove, described rotating shaft is connected with the inner ring of inner bearing, rotating shaft is connected with the inner ring of outer bearing, the outer ring of inner bearing and the groove madial wall of bearing fit groove compress mutually, the outer ring of outer bearing is connected with casing, described casing is provided with some shell location holes, described inducer is provided with some reference columns, described reference column and shell location hole one_to_one corresponding, reference column is through corresponding shell location hole, clamp mutually between described fan housing and casing.
As preferably, described bearing fit groove depth is greater than inner bearing height, and the bottom of described inner bearing contacts with the groove bottom of bearing fit groove, and described reference column number is four, four reference columns annular evenly arrangements centered by shaft axis.
As preferably, described fan housing comprises main cover body, is located at the convex cap of lower cover on main cover body and outwardly, the convex cap of described lower cover is provided with cover air inlet, described movable vane wheel comprises ring edge under impeller bodies, impeller, under described impeller, ring edge is provided with impeller air inlet, impeller air inlet is communicated with cover air inlet, is provided with fan housing sealing ring in the convex cap of described lower cover, and under described impeller, ring edge and fan housing sealing ring contact with each other.
As preferably, the convex cap lower end of described lower cover inwardly curls into ring groove, described fan housing sealing ring is fixed in ring groove, described fan housing sealing ring is provided with annular seal groove, the axis of annular seal groove and the dead in line of fan housing sealing ring, under described impeller, ring edge lower end is stretched in annular seal groove, and under impeller, the lateral wall of ring edge contacts with the cell wall of annular seal groove, and under impeller, the madial wall of ring edge contacts with the cell wall of annular seal groove.
As preferably, under described impeller, ring edge lower end is provided with round and smooth incision head, and under described round and smooth incision head and impeller, ring edge is formed in one structure, has surplus gap between described round and smooth incision head and the bottom land of annular seal groove.
As preferably, inflatable chamber is provided with in described fan housing sealing ring, described fan housing sealing ring is provided with wireway, be provided with annular in described fan housing and regulate cylinder, annular flap, annular regulates cylinder, annular flap is coaxial with rotating shaft, described rotating shaft is connected to the madial wall of annular flap by some cross bars, described annular regulates the lateral wall of cylinder to be connected with fan housing madial wall, described annular regulates in cylinder has appearance air cavity, described annular flap lateral wall stretches into annular and regulates in the appearance air cavity of cylinder, described annular flap is provided with some regulating tanks be opened on annular flap lateral wall, spring is provided with in described regulating tank, the adjusting rod be slidably matched with regulating tank, it is inner that described spring one end connects adjusting rod, the spring other end connects annular flap, described wireway one end is communicated with appearance air cavity, the wireway other end is communicated with inflatable chamber.
As preferably, described adjusting rod comprises integrated main rod body and the outer body of rod, described main rod body is connected with spring, described outer body of rod the inner is connected with main rod body, the described outer body of rod is provided with the wheel shaft be rotationally connected with the outer body of rod, described wheel shaft is provided with at least one tactile wall roller be connected with wheel shaft, and the pivot center of described tactile wall roller overlaps with axle axis.
The invention has the beneficial effects as follows: casing and the direct tight fit of fan housing, undertaken leading and locating by reference column therebetween, quick for installation, quality of fit is high; Eliminate extra supporting structure, bearing is set directly in the bearing fit groove on inducer, and decrease accumulated error, improve assembly precision, holistic cost also reduces greatly.
Accompanying drawing explanation
Fig. 1 is the structural representation of the embodiment of the present invention 1;
Fig. 2 is the partial structurtes schematic diagram of the embodiment of the present invention 2;
Fig. 3 is the partial enlarged drawing of Fig. 2;
Fig. 4 is the structural representation at annular seal groove place in the embodiment of the present invention 2;
Fig. 5 is the annular flap place structural representation in the embodiment of the present invention 2;
The vertical view that Fig. 6 is cross bar in the embodiment of the present invention 2, annular regulates cylinder, annular flap place.
In figure: ring edge 27 under inducer 1, movable vane wheel 2, fan housing 3, casing 4, rotor 5, stator 6, rotating shaft 7, inner bearing 8, outer bearing 9, reference column 10, main cover body 11, the convex cap of lower cover 12, cover air inlet 13, fan housing sealing ring 14, annular seal groove 15, inflatable chamber 16, wireway 17, annular adjustment cylinder 18, annular flap 19, appearance air cavity 20, regulating tank 21, spring 22, adjusting rod 23, the outer body of rod 24, tactile wall roller 25, cross bar 26, impeller.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention will be further described.
Embodiment 1: in embodiment as shown in Figure 1, a kind of quick-mounting motor, comprise inducer 1, movable vane wheel 2, fan housing 3, casing 4, described inducer, movable vane wheel is within fan housing, also comprise carbon brush, rotor 5, stator 6, the rotating shaft 7 be connected with rotor coaxial, described rotating shaft is provided with inner bearing 8, outer bearing 9, bearing fit groove is provided with in the middle part of described inducer, described bearing fit groove is coaxial with inducer, described inner bearing is in bearing fit groove, described rotating shaft is connected with the inner ring of inner bearing, rotating shaft is connected with the inner ring of outer bearing, the outer ring of inner bearing and the groove madial wall of bearing fit groove compress mutually, the outer ring of outer bearing is connected with casing, described casing is provided with some shell location holes, described inducer is provided with some reference columns 10, described reference column and shell location hole one_to_one corresponding, reference column is through corresponding shell location hole, clamp mutually between described fan housing and casing.Described bearing fit groove depth is greater than inner bearing height, and the bottom of described inner bearing contacts with the groove bottom of bearing fit groove, and described reference column number is four, four reference column annular evenly arrangements centered by shaft axis.
Direct reference column replaces original screw, while eliminating screw, also improve installation effectiveness, only need during installation that reference column is aimed at corresponding shell location hole and carry out assembling, between fan housing and casing, direct clamping, is particularly useful for low-power machine.Reference column, except having the effect of auxiliary installation, location, can also be avoided relatively rotating between fan housing and casing, lift structure stability.Bearing fit groove is directly opened on inducer, eliminates extra supporting structure, both reduces cost, improve precision again.
Embodiment 2: the basic structure of the present embodiment and execution mode are with embodiment 1, its difference is, as as shown in Fig. 2 to Fig. 6, described fan housing comprises main cover body 11, is located at the convex cap 12 of lower cover on main cover body and outwardly, the convex cap of described lower cover is provided with cover air inlet 13, described movable vane wheel comprises ring edge 27 under impeller bodies, impeller, under described impeller, ring edge is provided with impeller air inlet, impeller air inlet is communicated with cover air inlet, be provided with fan housing sealing ring 14 in the convex cap of described lower cover, under described impeller, ring edge and fan housing sealing ring contact with each other.
The convex cap lower end of described lower cover inwardly curls into ring groove, described fan housing sealing ring is fixed in ring groove, described fan housing sealing ring is provided with annular seal groove 15, the axis of annular seal groove and the dead in line of fan housing sealing ring, under described impeller, ring edge lower end is stretched in annular seal groove, under impeller, the lateral wall of ring edge contacts with the cell wall of annular seal groove, and under impeller, the madial wall of ring edge contacts with the cell wall of annular seal groove.
Under described impeller, ring edge lower end is provided with round and smooth incision head, and under described round and smooth incision head and impeller, ring edge is formed in one structure, has surplus gap between described round and smooth incision head and the bottom land of annular seal groove.
Impeller body for giving, one of wind-guiding main body main body, need between ring edge and the fan housing of motor under impeller to seal, otherwise air enters fan housing from impeller between ring edge and the fan housing of motor, fan housing inner air can be caused to flow chaotic, have a strong impact on air inlet/outlet efficiency, increase noise.And ring edge to move (during machine operation under impeller, impeller body, under impeller, ring edge all will rotate), so will movable sealing be realized, and the sealing ring that under impeller, the easy scratch in ring edge lower end is common, and at the present embodiment, adopt the mode designing annular seal groove on sealing ring, thus, under impeller, ring edge lower end can be stretched in annular seal groove, under such impeller, ring edge lower end is not just direct sealing contact surface, sealing contact surface becomes two sides of ring edge under impeller, so can both not easily scratch wheel cover sealing rings, good movable sealing effect can be ensured again.In addition, the design in round and smooth incision header structure, surplus gap, also can reduce the damage to wheel cover sealing ring, and can promote press seal effect.
Inflatable chamber 16 is provided with in described fan housing sealing ring, described fan housing sealing ring is provided with wireway 17, be provided with annular in described fan housing and regulate cylinder 18, annular flap 19, annular regulates cylinder, annular flap is coaxial with rotating shaft, described rotating shaft is connected to the madial wall of annular flap by some cross bars 26, described annular regulates the lateral wall of cylinder to be connected with fan housing madial wall, described annular regulates in cylinder to have holds air cavity 20, described annular flap lateral wall stretches into annular and regulates in the appearance air cavity of cylinder, described annular flap is provided with some regulating tanks 21 be opened on annular flap lateral wall, spring 22 is provided with in described regulating tank, the adjusting rod 23 be slidably matched with regulating tank, it is inner that described spring one end connects adjusting rod, the spring other end connects annular flap, described wireway one end is communicated with appearance air cavity, the wireway other end is communicated with inflatable chamber.
Motor is after normal operation, and the dynamic stability of rotating shaft, movable vane wheel is good, axiality high (magnitude of angular velocity is also stablized), and entirety is in a comparatively stable rotary state; But when motor just starts, rotation axiality is poor, and now under impeller body, impeller, ring edge is unstable, axial runout is also large, now under impeller, ring edge the most easily hurts fan housing sealing ring, so devise the fan housing ring structure with annular seal groove in aforementioned schemes, to reduce counter productive.And in the present embodiment, also sealing ring is designed to the form of inner inflatable, when rotating shaft rotating speed is larger, under the influence of centrifugal force, adjusting rod on annular flap slides and stretches out regulating tank outer (now spring elongation), all adjusting rods have compressed the volume that annular regulates cylinder content air cavity together, so the air in appearance air cavity is pressed towards inflatable chamber by wireway, then fan housing sealing ring heaves degree change greatly, with seal between ring edge under impeller, coordinate tightr, therefore, rotating speed is larger, and sealing effectiveness is better.And when rotating speed extremely low (when motor just starts), because centrifugal force is not enough, adjusting rod cannot stretch out outside regulating tank, so annular regulates the air in the appearance air cavity of cylinder can not be pressed onto the inflatable chamber of fan housing sealing ring, now fan housing sealing ring can not fully be heaved, there is very strong compressive deformation ability, even if ring edge under encountering impeller, also can adaptive local contraction, even if so now under impeller ring edge rotate instability, also not easily scratch fan housing sealing ring (during motor ground zero, sealing effectiveness requires very low, because now air intake is not also stablized, air quantity is also minimum).So what the present embodiment can regulate fan housing sealing ring automatically according to the running status of motor heaves degree, carries out the adjustment of sealing, can protect fan housing sealing ring, can ensure again sealing effectiveness during work.
Described adjusting rod comprises integrated main rod body and the outer body of rod 24, described main rod body is connected with spring, described outer body of rod the inner is connected with main rod body, the described outer body of rod is provided with the wheel shaft be rotationally connected with the outer body of rod, described wheel shaft is provided with at least one tactile wall roller 25 be connected with wheel shaft, and the pivot center of described tactile wall roller overlaps with axle axis.When rotating speed is very high, adjusting rod outreach is very large, now the tactile wall roller of adjusting rod outer end can regulate the inside wall of cylinder to contact with annular, carry out friction rolling (after rotating speed reaches a larger value, fan housing sealing ring degree of inflation enough ensures sealing, then adjusting rod outer end can be continued overhanging again), can prevent adjusting rod outer end from directly regulating cylinder to clash into annular, the stability of running can be promoted again.
Claims (7)
1. a quick-mounting motor, it is characterized in that, comprise inducer, movable vane is taken turns, fan housing, casing, described inducer, movable vane wheel is within fan housing, also comprise carbon brush, rotor, stator, the rotating shaft be connected with rotor coaxial, described rotating shaft is provided with inner bearing, outer bearing, bearing fit groove is provided with in the middle part of described inducer, described bearing fit groove is coaxial with inducer, described inner bearing is in bearing fit groove, described rotating shaft is connected with the inner ring of inner bearing, rotating shaft is connected with the inner ring of outer bearing, the outer ring of inner bearing and the groove madial wall of bearing fit groove compress mutually, the outer ring of outer bearing is connected with casing, described casing is provided with some shell location holes, described inducer is provided with some reference columns, described reference column and shell location hole one_to_one corresponding, reference column is through corresponding shell location hole, clamp mutually between described fan housing and casing.
2. a kind of quick-mounting motor according to claim 1, it is characterized in that, described bearing fit groove depth is greater than inner bearing height, the bottom of described inner bearing contacts with the groove bottom of bearing fit groove, described reference column number is four, four reference column annular evenly arrangements centered by shaft axis.
3. a kind of quick-mounting motor according to claim 1 and 2, it is characterized in that, described fan housing comprises main cover body, is located at the convex cap of lower cover on main cover body and outwardly, the convex cap of described lower cover is provided with cover air inlet, described movable vane wheel comprises ring edge under impeller bodies, impeller, and under described impeller, ring edge is provided with impeller air inlet, and impeller air inlet is communicated with cover air inlet, be provided with fan housing sealing ring in the convex cap of described lower cover, under described impeller, ring edge and fan housing sealing ring contact with each other.
4. a kind of quick-mounting motor according to claim 3, it is characterized in that, the convex cap lower end of described lower cover inwardly curls into ring groove, described fan housing sealing ring is fixed in ring groove, described fan housing sealing ring is provided with annular seal groove, the axis of annular seal groove and the dead in line of fan housing sealing ring, under described impeller, ring edge lower end is stretched in annular seal groove, under impeller, the lateral wall of ring edge contacts with the cell wall of annular seal groove, and under impeller, the madial wall of ring edge contacts with the cell wall of annular seal groove.
5. a kind of quick-mounting motor according to claim 4, it is characterized in that, under described impeller, ring edge lower end is provided with round and smooth incision head, and under described round and smooth incision head and impeller, ring edge is formed in one structure, has surplus gap between described round and smooth incision head and the bottom land of annular seal groove.
6. a kind of quick-mounting motor according to claim 3 or 4 or 5, it is characterized in that, inflatable chamber is provided with in described fan housing sealing ring, described fan housing sealing ring is provided with wireway, be provided with annular in described fan housing and regulate cylinder, annular flap, annular regulates cylinder, annular flap is coaxial with rotating shaft, described rotating shaft is connected to the madial wall of annular flap by some cross bars, described annular regulates the lateral wall of cylinder to be connected with fan housing madial wall, described annular regulates in cylinder has appearance air cavity, described annular flap lateral wall stretches into annular and regulates in the appearance air cavity of cylinder, described annular flap is provided with some regulating tanks be opened on annular flap lateral wall, spring is provided with in described regulating tank, the adjusting rod be slidably matched with regulating tank, it is inner that described spring one end connects adjusting rod, the spring other end connects annular flap, described wireway one end is communicated with appearance air cavity, the wireway other end is communicated with inflatable chamber.
7. a kind of quick-mounting motor according to claim 6, it is characterized in that, described adjusting rod comprises integrated main rod body and the outer body of rod, described main rod body is connected with spring, described outer body of rod the inner is connected with main rod body, the described outer body of rod is provided with the wheel shaft be rotationally connected with the outer body of rod, and described wheel shaft is provided with at least one tactile wall roller be connected with wheel shaft, and the pivot center of described tactile wall roller overlaps with axle axis.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510868764.7A CN105490430B (en) | 2015-12-01 | 2015-12-01 | A kind of quick-mounting motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510868764.7A CN105490430B (en) | 2015-12-01 | 2015-12-01 | A kind of quick-mounting motor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105490430A true CN105490430A (en) | 2016-04-13 |
| CN105490430B CN105490430B (en) | 2017-10-31 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510868764.7A Active CN105490430B (en) | 2015-12-01 | 2015-12-01 | A kind of quick-mounting motor |
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| Country | Link |
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| CN (1) | CN105490430B (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003049799A (en) * | 2001-06-01 | 2003-02-21 | Toshiba Tec Corp | Motor driven blower and vacuum cleaner |
| CN202260751U (en) * | 2011-09-08 | 2012-05-30 | 苏州首信电机有限公司 | Synergy structure of cleaner motor |
| CN202288139U (en) * | 2011-09-28 | 2012-07-04 | 台山市江口电器制造有限公司 | Alternating-current series motor for dust collector |
| CN203257753U (en) * | 2013-05-10 | 2013-10-30 | 宁波富佳实业有限公司 | Dust collector electric fan with inducer and end cover integrated |
| CN203398904U (en) * | 2013-07-22 | 2014-01-15 | 宁波德昌电机制造有限公司 | Motor fan housing for vacuum cleaner |
| CN203398941U (en) * | 2013-07-22 | 2014-01-15 | 宁波德昌电机制造有限公司 | Dust collector motor |
| CN203892257U (en) * | 2014-06-12 | 2014-10-22 | 莱克电气股份有限公司 | Draught fan structure of dust collector motor |
| CN204992862U (en) * | 2015-08-19 | 2016-01-20 | 常州祥明电机有限公司 | Exchange asynchronous inner rotor motor |
| CN205195466U (en) * | 2015-12-01 | 2016-04-27 | 宁波德昌电机制造有限公司 | Motor structure with high assembly precision |
-
2015
- 2015-12-01 CN CN201510868764.7A patent/CN105490430B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003049799A (en) * | 2001-06-01 | 2003-02-21 | Toshiba Tec Corp | Motor driven blower and vacuum cleaner |
| CN202260751U (en) * | 2011-09-08 | 2012-05-30 | 苏州首信电机有限公司 | Synergy structure of cleaner motor |
| CN202288139U (en) * | 2011-09-28 | 2012-07-04 | 台山市江口电器制造有限公司 | Alternating-current series motor for dust collector |
| CN203257753U (en) * | 2013-05-10 | 2013-10-30 | 宁波富佳实业有限公司 | Dust collector electric fan with inducer and end cover integrated |
| CN203398904U (en) * | 2013-07-22 | 2014-01-15 | 宁波德昌电机制造有限公司 | Motor fan housing for vacuum cleaner |
| CN203398941U (en) * | 2013-07-22 | 2014-01-15 | 宁波德昌电机制造有限公司 | Dust collector motor |
| CN203892257U (en) * | 2014-06-12 | 2014-10-22 | 莱克电气股份有限公司 | Draught fan structure of dust collector motor |
| CN204992862U (en) * | 2015-08-19 | 2016-01-20 | 常州祥明电机有限公司 | Exchange asynchronous inner rotor motor |
| CN205195466U (en) * | 2015-12-01 | 2016-04-27 | 宁波德昌电机制造有限公司 | Motor structure with high assembly precision |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105490430B (en) | 2017-10-31 |
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Address after: 315400, 18 East Yongxing Road, Fengshan street, Yuyao street, Ningbo, Zhejiang Patentee after: Ningbo Dechang Electric Co., Ltd Address before: 315400, 18 East Yongxing Road, Fengshan street, Yuyao street, Ningbo, Zhejiang Patentee before: Ningbo Dechang Electrical Machinery Manufacturing Co., Ltd. |