CN104654881B - A kind of lightweight efficient heat transfer copper pipe - Google Patents
A kind of lightweight efficient heat transfer copper pipe Download PDFInfo
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- CN104654881B CN104654881B CN201410838978.5A CN201410838978A CN104654881B CN 104654881 B CN104654881 B CN 104654881B CN 201410838978 A CN201410838978 A CN 201410838978A CN 104654881 B CN104654881 B CN 104654881B
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Abstract
The present invention relates to heat-transfer pipe technical field, disclose a kind of lightweight efficient heat transfer copper pipe, including copper pipe body, copper pipe body inwall is provided with three groups of tooth ribs in spiral distribution, it is respectively tooth rib A, tooth rib B, tooth rib C, tooth rib A, tooth rib B, the cross section of tooth rib C is triangular in shape, on the arbitrary cross section of copper pipe body, tooth rib A, tooth rib B, tooth rib C place cambered surface respectively accounts for 120 ° of central angles, the addendum angle of the tooth rib A addendum angle less than tooth rib B, the addendum angle of the tooth rib B addendum angle less than tooth rib C, copper pipe body inwall is additionally provided with some radiating grooves, radiating groove is along tooth rib direction Spiral distribution.Therefore, the present invention has can effectively reduce coolant circulating resistance, the beneficial effect of exchange rate between different parts coolant in raising copper pipe body.
Description
Technical field
The present invention relates to heat-transfer pipe technical field, particularly relate to a kind of lightweight efficient heat transfer copper pipe.
Background technology
Condenser and vaporizer in air-conditioning are all to be formed by inner screw thread copper pipe dish system, it is upgraded to inner screw thread copper pipe from light pipe in heat-transfer pipe technical field, it it is a big technological innovation, greatly improve air conditioner refrigerating, the performance heated, current inner screw thread copper pipe is typically all single helicla flute or helical tooth, also many documents or patent is had to disclose the helical tooth of different cross section shape, such as there is M shape, Y shape, trapezoidal, semi-circular teeth, variously-shaped profile of tooth is contemplated to nothing but increase heat transfer surface area, but for inner screw thread copper pipe, it is only that the cross sectional shape changing tooth does not fundamentally increase heat transfer performance, and some tooth Profile Machining is extremely difficult, some profiles of tooth can increase media flow resistance, counter productive can be brought, even reduce the heat transfer performance of corrugated tubing itself.
Chinese patent Authorization Notice No.: CN100365370C, authorized announcement date on January 30th, 2008, disclose a kind of female screw heat-transfer pipe, having helical tooth on its inner surface, the cross section of helical tooth is Y-shaped, has an open cavity between two adjacent teeth, the height of the two side of tooth is equal or unequal, the Breadth Maximum of adjacent two between cog cavitys is more than the width of cavity, and heat-transfer pipe is suitable for room air conditioner, is particularly suited for cold-warm type room air conditioner.Its weak point is that Y shape tooth can increase coolant circulating resistance in copper pipe, it is unfavorable for heat transfer inside and outside copper pipe, coolant is more uniform at copper Bottomhole pressure, flow-disturbing intensity is little, at copper pipe inwall and between the coolant in copper pipe centre, heat exchange is slower, heat is formed with the coolant of copper pipe center after coolant and heat exchange with outside poor at copper pipe inwall, owing to flow-disturbing intensity is little, at copper pipe inwall, between coolant and copper pipe centre coolant, heat transmission is slow, thus cause the internal coolant of copper pipe to decline with the hot heat exchange performance in the external world, reduce the heat exchange performance of heat-transfer pipe.
Summary of the invention
The screw thread that the present invention is to solve in prior art in copper pipe causes coolant flow resistance to increase, the deficiency that in heat-transfer pipe, different parts coolant exchange rate is low, provide one and can effectively reduce coolant circulating resistance, strengthen copper pipe body internal flow-disturbing, action of turbulent flow, improve the lightweight efficient heat transfer copper pipe of copper pipe body internal-external heat exchange speed.
To achieve these goals, the present invention adopts the following technical scheme that
A kind of lightweight efficient heat transfer copper pipe, including copper pipe body, described copper pipe body inwall is provided with three groups of tooth ribs in spiral distribution, it is respectively tooth rib A, tooth rib B, tooth rib C, tooth rib A, tooth rib B, tooth rib C cross section triangular in shape, on the arbitrary cross section of copper pipe body, tooth rib A, tooth rib B, tooth rib C place cambered surface respectively account for 120 ° of central angles, the addendum angle of the tooth rib A addendum angle less than tooth rib B, the addendum angle of the tooth rib B addendum angle less than tooth rib C, described copper pipe body inwall is additionally provided with some radiating grooves, and described radiating groove is along tooth rib direction Spiral distribution.
nullWhen coolant steam flows in copper pipe body，Tooth rib、Radiating groove effectively increases heat transfer surface area，Radiating groove can also alleviate the weight of copper pipe body，Tooth rib has guiding function to steam simultaneously，Steam is flowed along the hand of spiral，Owing to being distributed the tooth rib that three kinds of addendum angles are different in copper pipe body，Thus cause at copper pipe body arbitrary section，Tooth rib A、Tooth rib B、The resistance that steam in tooth rib C corresponding region is subject to is different，Thus form the coolant steam that three plume speed are different，Owing to the flow velocity of three strands of steam streams is different，Three strands of coolant steam streams mutually knock into the back and strengthen the flow-disturbing effect of coolant circumference，Strengthen the action of turbulent flow of copper pipe body inwall and middle part steam in turn，Promote quickly to realize between different parts steam heat balance，Exchange rate between different parts coolant in raising copper pipe body，Ensure that the coolant at copper pipe body inwall is quick、Abundant and the external world carries out heat exchange.
As preferably, the cross section of described radiating groove is curved, radiating groove quantity on tooth rib C correspondence copper pipe body inwall is more than the radiating groove quantity on tooth rib B correspondence copper pipe body inwall, and the radiating groove quantity on tooth rib B correspondence copper pipe body inwall is more than the radiating groove quantity on tooth rib A correspondence copper pipe body inwall.Addendum angle is many compared with the radiating groove quantity on copper pipe body inwall corresponding at big tooth rib, and addendum angle is few compared with the radiating groove quantity on copper pipe body inwall corresponding at little tooth rib, thus ensures that copper pipe body self-strength is stable.
As preferably, described tooth rib A, tooth rib B, the height of teeth top of tooth rib C reduce respectively along identical circumference from Article 1 to the last item successively, and tooth rib A, tooth rib B, the maximum tooth of tooth rib C are risen identical, and tooth rib A, tooth rib B, the minimum tooth of tooth rib C are risen the most identical.When coolant flows in copper pipe body, centrifugal force is produced under the effect of tooth rib, tooth rib A, tooth rib B, the height of teeth top of tooth rib C reduces successively, the line of corresponding tooth top is three sections of circular arcs the most concentric with copper pipe body, the guiding function that coolant is had by three sections of circular arcs, coolant along copper pipe body inwall flow time, it is positioned at arbitrarily angled suffered resistance and is different from, the steam stream that multiply speed is different can be formed in whole copper pipe body, formation flow-disturbing is interfered between air-flow, enhance the heat exchange between coolant steam at the internal different spaces of copper pipe body greatly, thus the coolant steam-energy in ensureing copper pipe body and the external world carry out heat exchange to greatest extent.
As preferably, described copper pipe body inwall is additionally provided with and tooth rib A, tooth rib B, helicla flute oppositely oriented for tooth rib C.On the one hand helicla flute can effectively reduce the circulating resistance of coolant, on the other hand can reduce the thickness of copper pipe body inner boundary layer (coolant of gas-liquid mixed state, liquid refrigerants can form boundary region with the laminating of copper pipe body inwall under the influence of centrifugal force).
As preferably, described helicla flute face on the basis of maximum tooth rises place periphery in tooth rib A, tooth rib B, tooth rib C, to the distance of copper pipe body inwall equal to the meansigma methods of all tooth depths in tooth rib A, tooth rib B, tooth rib C bottom helicla flute.Due to tooth rib A, tooth rib B, the height of teeth top of tooth rib C is different, only height of teeth top just more than the tooth rib top of meansigma methods can intersect with helicla flute and be cut off by helicla flute, height of teeth top is big to coolant flow resistance more than the tooth rib of meansigma methods, helicla flute can reduce this resistance targetedly, part coolant can carry out flowing across tooth rib at helicla flute, thus form some shallow bids adverse current, countercurrently and higher than interfering between the following current at the tooth rib of meansigma methods form turbulent flow, shallow bid adverse current also impact teeth can rise the following current at less than the tooth rib of meansigma methods under the effect of inertia simultaneously, thus various location forms different azimuth in pipe, the flow-disturbing of angle, turbulent flow, improve greatly between coolant, coolant and extraneous heat exchanger effectiveness.
As preferably, in described copper pipe body, it is additionally provided with expansion tube, forms annular chamber between described expansion tube and copper pipe body, in described expansion tube, be provided with some independent expansion chambers vertically.Owing to the coolant in copper pipe body centre needs to carry out heat exchange by the coolant at inwall with the external world, although this heat exchanger effectiveness is high, but also it is less than the coolant at inwall directly and the efficiency of heat exchange with outside, therefore center arranges expansion tube, coolant is flowed in annular chamber, increases coolant and extraneous direct heat exchange ability；When high steam flows in copper pipe body, in order to ensure the compressive property of copper pipe body, the tube wall of common copper pipe is the thickest, and in this structure, expansion tube has the effect alleviating pressure, when annular cavity pressure is excessive, expansion chamber can be squeezed, thus plays the effect alleviating super pressure, and therefore the copper pipe body tube wall in this structure is thin compared with normal heat transfer tubes, the thin path that can reduce heat transfer of tube wall, strengthens the heat exchange inside and outside copper pipe body.
As preferably, the lateral wall of described expansion tube being uniformly provided with some axially distributed raised lines, the outward flange of described raised line undulate vertically is distributed.Owing in copper pipe body, coolant upstream end and outlet side exist certain temperature difference, thus cause the expanded size of expansion chamber there are differences, expansion chamber expanded size dynamically changes, thus the coolant in copper pipe body is produced radial pressure, strengthen coolant radially flow-disturbing, raised line can accelerate the gas heat absorption in expansion chamber, heat release, thus strengthen again expansion chamber and expand, shrink the impact on coolant radially flow-disturbing, improves coolant and extraneous heat exchanger effectiveness.
As preferably, the outer position between adjacent two expansion chambers of expansion tube is cased with adapter sleeve, is provided with some resilient support feet outside adapter sleeve.Expansion tube is outer all arranges adapter sleeve, resilient support foot every a segment distance, it is thus possible to keep the concentricity of expansion tube and copper pipe body to greatest extent, prevents expansion tube outer wall and copper pipe body contact internal walls.
As preferably, the length that two expansion chambers adjacent in expansion tube are axial.Even if adjacent two expansion chamber environment temperatures are identical, but owing to expansion chamber varies in size, after expansion, maximum outside diameter is the most different, the external diameter of whole expansion tube is the most dynamically change, expansion tube different parts is also different to coolant steam action effect radially and dynamically changes, the flow-disturbing of coolant steam, turbulent flow effect in strengthening greatly.
As preferably, described expansion tube is silica gel tube, and described adapter sleeve, resilient support foot are made up of silica gel.Silica gel tube has high temperature resistant, low temperature resistant, aging-resistant performance, and service life is long.
Therefore, the present invention has can effectively reduce coolant circulating resistance, the beneficial effect of exchange rate between different parts coolant in raising copper pipe body.
Accompanying drawing explanation
Fig. 1 is the structural representation of embodiment 1.
Fig. 2 is the structural representation of embodiment 2.
Fig. 3 is that in embodiment 2, in copper pipe body, schematic diagram is launched at A-A position.
Fig. 4 is the structural representation of embodiment 3.
Fig. 5 is the sectional side view of embodiment 3.
In figure: copper pipe body 1 tooth rib A2
Tooth rib B3 tooth rib C4 helicla flute 5 expansion tube 6 annular chamber 7 expansion chamber 8 raised line 9 adapter sleeve 10
Resilient support foot 11 radiating groove 100
Detailed description of the invention
The invention will be further described with detailed description of the invention below in conjunction with the accompanying drawings:
nullEmbodiment 1: a kind of lightweight efficient heat transfer copper pipe as shown in Figure 1，Including copper pipe body 1，Copper pipe body 1 inwall is provided with three groups of tooth ribs in spiral distribution，Tooth rib A2、Tooth rib B3、Tooth rib C4，Tooth rib A、Tooth rib B、The cross section of tooth rib C is triangular in shape，Tooth rib A、Tooth rib B、The addendum angle of tooth rib C is fillet，Thus reduce coolant resistance，On the arbitrary cross section of copper pipe body，Tooth rib A、Tooth rib B、Tooth rib C place cambered surface respectively accounts for 120 ° of central angles，The addendum angle of tooth rib A is 10 °，The addendum angle of tooth rib B is 20 °，The addendum angle of tooth rib C is 30 °，Tooth rib A、Tooth rib B、Tooth rib C is 30 ° with the angle β of copper pipe body axis，Copper pipe body 1 inwall is additionally provided with some radiating grooves 100，Radiating groove is along tooth rib direction Spiral distribution，The cross section of radiating groove is curved，Radiating groove quantity on tooth rib C correspondence copper pipe body inwall is more than the radiating groove quantity on tooth rib B correspondence copper pipe body inwall，Radiating groove quantity on tooth rib B correspondence copper pipe body inwall is more than the radiating groove quantity on tooth rib A correspondence copper pipe body inwall.The resistance that steam in tooth rib A, tooth rib B, tooth rib C corresponding region is subject to is different, thus form the coolant steam that three plume speed are different, owing to the flow velocity of three strands of steam streams is different, three strands of coolant steam streams mutually knock into the back and strengthen the flow-disturbing effect of coolant circumference, strengthen the action of turbulent flow of copper pipe body inwall and middle part steam in turn, promote quickly to realize between different parts steam heat balance, exchange rate between different parts coolant in raising copper pipe body, it is ensured that the coolant at copper pipe body inwall is quick, abundant and the external world carries out heat exchange.
nullEmbodiment 2: a kind of lightweight efficient heat transfer copper pipe as shown in Figure 2，Including copper pipe body 1，Copper pipe body 1 inwall is provided with three groups of tooth ribs in spiral distribution，Tooth rib A2、Tooth rib B3、Tooth rib C4，Tooth rib A、Tooth rib B、The cross section of tooth rib C is triangular in shape，Tooth rib A、Tooth rib B、The addendum angle of tooth rib C is fillet，Thus reduce coolant resistance，On the arbitrary cross section of copper pipe body，Tooth rib A、Tooth rib B、Tooth rib C place cambered surface respectively accounts for 120 ° of central angles，The addendum angle of tooth rib A is 15 °，The addendum angle of tooth rib B is 20 °，The addendum angle of tooth rib C is 35 °，Tooth rib A、Tooth rib B、Tooth rib C is 25 ° with the angle β of copper pipe body axis，Copper pipe body 1 inwall is additionally provided with some radiating grooves 100，Radiating groove is along tooth rib direction Spiral distribution，The cross section of radiating groove is curved，Radiating groove quantity on tooth rib C correspondence copper pipe body inwall is more than the radiating groove quantity on tooth rib B correspondence copper pipe body inwall，Radiating groove quantity on tooth rib B correspondence copper pipe body inwall is more than the radiating groove quantity on tooth rib A correspondence copper pipe body inwall；Tooth rib A, tooth rib B, the height of teeth top of tooth rib C reduce respectively along identical circumference from Article 1 to the last item successively, and tooth rib A, tooth rib B, the maximum tooth of tooth rib C are risen identical, and tooth rib A, tooth rib B, the minimum tooth of tooth rib C are risen the most identical；As it is shown on figure 3, copper pipe body inwall is additionally provided with and tooth rib A, tooth rib B, helicla flute 5 oppositely oriented for tooth rib C；In tooth rib A, tooth rib B, tooth rib C, maximum tooth rises face on the basis of the periphery of place, and bottom helicla flute 5, the distance to copper pipe body inwall is equal to the meansigma methods of all tooth depths in tooth rib A, tooth rib B, tooth rib C.
nullEmbodiment 3: a kind of lightweight efficient heat transfer copper pipe as shown in Figure 4，Including copper pipe body 1，Copper pipe body 1 inwall is provided with three groups of tooth ribs in spiral distribution，Tooth rib A2、Tooth rib B3、Tooth rib C4，Tooth rib A、Tooth rib B、The cross section of tooth rib C is triangular in shape，Tooth rib A、Tooth rib B、The addendum angle of tooth rib C is fillet，Thus reduce coolant resistance，On the arbitrary cross section of copper pipe body，Tooth rib A、Tooth rib B、Tooth rib C place cambered surface respectively accounts for 120 ° of central angles，The addendum angle of tooth rib A is 10 °，The addendum angle of tooth rib B is 20 °，The addendum angle of tooth rib C is 30 °，Tooth rib A、Tooth rib B、Tooth rib C is 30 ° with the angle β of copper pipe body axis，Copper pipe body 1 inwall is additionally provided with some radiating grooves 100，Radiating groove is along tooth rib direction Spiral distribution，The cross section of radiating groove is curved，Radiating groove quantity on tooth rib C correspondence copper pipe body inwall is more than the radiating groove quantity on tooth rib B correspondence copper pipe body inwall，Radiating groove quantity on tooth rib B correspondence copper pipe body inwall is more than the radiating groove quantity on tooth rib A correspondence copper pipe body inwall，Tooth rib A、Tooth rib B、The height of teeth top of tooth rib C reduces respectively along identical circumference from Article 1 to the last item successively，Tooth rib A、Tooth rib B、The maximum tooth of tooth rib C is risen identical，Tooth rib A、Tooth rib B、The minimum tooth of tooth rib C is risen the most identical；Copper pipe body inwall is additionally provided with and tooth rib A, tooth rib B, helicla flute 5 oppositely oriented for tooth rib C；Being additionally provided with expansion tube 6 in copper pipe body, the external diameter of expansion tube is the 1/2 of copper pipe body internal diameter, forms annular chamber 7, be provided with some independent expansion chambers 8 in expansion tube vertically between expansion tube and copper pipe body.
As it is shown in figure 5, be uniformly provided with some axially distributed raised lines 9 on the lateral wall of expansion tube 6, the outward flange of raised line 9 undulate vertically is distributed, the length that two expansion chambers adjacent in expansion tube are axial；The outer position between adjacent two expansion chambers of expansion tube 6 is cased with adapter sleeve 10, some resilient support feet 11 it are provided with outside adapter sleeve, resilient support foot outer end supports with copper pipe body contact internal walls, thus basic guarantee expansion tube and the concentricity of copper pipe body, prevent expansion tube outer wall and copper pipe body contact internal walls, expansion tube is silica gel tube, and adapter sleeve, resilient support foot are made up of silica gel.
When in copper pipe body by vapours, expansion chamber expanded by heating, the air pressure in annular chamber can be increased, strengthen the heat exchange inside and outside copper pipe body；When the air pressure in annular chamber is the biggest, expansion chamber can compress, thus reduces the air pressure pressure to copper pipe body inwall, plays a protective role.The axial length of adjacent expansion chamber there are differences, thus after causing finally expanding, on whole expansion tube, each portion of maximum outside diameter of the position of corresponding expansion chamber is identical, and coolant is when flowing in copper pipe body, temperature around expansion chamber is constantly generation minor variations, also dynamically change can be there is in this expanded size resulting in expansion chamber, the dynamically change of expansion chamber is radially producing active force to the coolant in annular chamber, thus the turbulent flow of coolant radial direction, flow-disturbing, enhancing coolant and extraneous heat exchange in strengthening annular chamber.
Therefore, the present invention has can effectively reduce coolant circulating resistance, the beneficial effect of exchange rate between different parts coolant in raising copper pipe body.
Claims (10)
1. a lightweight efficient heat transfer copper pipe, including copper pipe body, it is characterized in that, described copper pipe body inwall is provided with three groups of tooth ribs in spiral distribution, it is respectively tooth rib A, tooth rib B, tooth rib C, tooth rib A, tooth rib B, the cross section of tooth rib C is triangular in shape, on the arbitrary cross section of copper pipe body, tooth rib A, tooth rib B, tooth rib C place cambered surface respectively accounts for 120 ° of central angles, the addendum angle of the tooth rib A addendum angle less than tooth rib B, the addendum angle of the tooth rib B addendum angle less than tooth rib C, described copper pipe body inwall is additionally provided with some radiating grooves, described radiating groove is along tooth rib direction Spiral distribution.
A kind of lightweight efficient heat transfer copper pipe the most according to claim 1, it is characterized in that, the cross section of described radiating groove is curved, radiating groove quantity on tooth rib C correspondence copper pipe body inwall is more than the radiating groove quantity on tooth rib B correspondence copper pipe body inwall, and the radiating groove quantity on tooth rib B correspondence copper pipe body inwall is more than the radiating groove quantity on tooth rib A correspondence copper pipe body inwall.
A kind of lightweight efficient heat transfer copper pipe the most according to claim 1, it is characterized in that, described tooth rib A, tooth rib B, the height of teeth top of tooth rib C reduce respectively along identical circumference from Article 1 to the last item successively, tooth rib A, tooth rib B, the maximum tooth of tooth rib C are risen identical, and tooth rib A, tooth rib B, the minimum tooth of tooth rib C are risen the most identical.
A kind of lightweight efficient heat transfer copper pipe the most according to claim 3, is characterized in that, described copper pipe body inwall is additionally provided with and tooth rib A, tooth rib B, helicla flute oppositely oriented for tooth rib C.
A kind of lightweight efficient heat transfer copper pipe the most according to claim 4, it is characterized in that, described helicla flute face on the basis of maximum tooth rises place periphery in tooth rib A, tooth rib B, tooth rib C, to the distance of copper pipe body inwall equal to the meansigma methods of all tooth depths in tooth rib A, tooth rib B, tooth rib C bottom helicla flute.
6. according to a kind of lightweight efficient heat transfer copper pipe described in claim 1 or 3 or 4 or 5, it is characterized in that, it is additionally provided with expansion tube in described copper pipe body, forms annular chamber between described expansion tube and copper pipe body, in described expansion tube, be provided with some independent expansion chambers vertically.
A kind of lightweight efficient heat transfer copper pipe the most according to claim 6, is characterized in that, the lateral wall of described expansion tube is uniformly provided with some axially distributed raised lines, and the outward flange of described raised line undulate vertically is distributed.
A kind of lightweight efficient heat transfer copper pipe the most according to claim 7, is characterized in that, the outer position between adjacent two expansion chambers of expansion tube is cased with adapter sleeve, is provided with some resilient support feet outside adapter sleeve.
A kind of lightweight efficient heat transfer copper pipe the most according to claim 6, is characterized in that, the length that two expansion chambers adjacent in expansion tube are axial.
A kind of lightweight efficient heat transfer copper pipe the most according to claim 8, is characterized in that, described expansion tube is silica gel tube, and described adapter sleeve, resilient support foot are made up of silica gel.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410838978.5A CN104654881B (en) | 2014-12-30 | 2014-12-30 | A kind of lightweight efficient heat transfer copper pipe |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410838978.5A CN104654881B (en) | 2014-12-30 | 2014-12-30 | A kind of lightweight efficient heat transfer copper pipe |
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| CN104654881A CN104654881A (en) | 2015-05-27 |
| CN104654881B true CN104654881B (en) | 2016-10-05 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018134975A1 (en) * | 2017-01-20 | 2018-07-26 | 三菱電機株式会社 | Heat exchanger, refrigeration cycle device, and method for manufacturing heat exchanger |
| CN107542225A (en) * | 2017-09-30 | 2018-01-05 | 江苏联禹智能工程有限公司 | A kind of special enhancing tubing of intelligent building engineering |
| CN111854503A (en) * | 2020-07-13 | 2020-10-30 | 珠海格力电器股份有限公司 | Condenser pipe, condenser and air conditioning system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US5704424A (en) * | 1995-10-19 | 1998-01-06 | Mitsubishi Shindowh Co., Ltd. | Heat transfer tube having grooved inner surface and production method therefor |
| JP4294183B2 (en) * | 1999-11-08 | 2009-07-08 | 住友軽金属工業株式会社 | Internal grooved heat transfer tube |
| CN2742369Y (en) * | 2004-04-25 | 2005-11-23 | 吴家伟 | Inner ribbed tube for condenser or evaporator |
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Effective date of registration: 20170925 Address after: 335211 Jiangxi city of Yingtan province Yujiang County Development Zone, Wuhu Patentee after: Jiangxi Naile Copper Co., Ltd. Address before: 312300 people's West Road, Shangyu Economic Development Zone, Zhejiang, Shaoxing Patentee before: Zhejiang Nai Letong industry Co., Ltd |