CN101013013A - High finned heat-exchange tube and processing method thereof - Google Patents
High finned heat-exchange tube and processing method thereof Download PDFInfo
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- CN101013013A CN101013013A CN 200710019965 CN200710019965A CN101013013A CN 101013013 A CN101013013 A CN 101013013A CN 200710019965 CN200710019965 CN 200710019965 CN 200710019965 A CN200710019965 A CN 200710019965A CN 101013013 A CN101013013 A CN 101013013A
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Abstract
A high-fin heat exchange tube comprises a tube and external fins combined on the outer wall of tube. The external fins are extended along the axle of tube in screw shape on the outer wall of tube. The fins are shifted to two sides to form wave shape. The invention has the advantages that the outer wall of tube is formed by wave high fins, to strengthen the heat exchange and improve 10% of thermal conductivity. Compared with prior coiled-fin tube, the invention can eliminate the contact thermal resistance between the tube and fin root, the wave shape of high-fin is decided by the fins and the fin mould, to induce the airflow towards to the tube and backwards the tube along the radius of tube, with high horizontal interference on the airflow. The invention only arranges relative wave fin mould based on present technique.
Description
Technical field
The present invention relates to a kind of high finned heat-exchange tube, be applied on air cooler or the radiator, as reinforcement heat-exchanging part, and relate to the processing method of high finned heat-exchange tube, belong to heat-exchanging part and manufacturing technology field such as gas-gas, gas-water, gas-oil.
Background technology
High finned tube is often referred to the finned tube that fin height is 5-15mm, generally form with monometallic pipe such as aluminum pipe, steel-aluminum pipe, steel-stainless steel tube or composite metal pipe rolling, the 5-12 that its rib area is a light pipe doubly, be mainly used in the heat transfer of strengthening gas side, general overall heat-transfer coefficient improves 50-100% than light pipe, is widely used in food drying, pharmacy, chemical industry, the cooling of petrochemical industry air and other industry.
The heat-exchange tube that is applied to above-mentioned field can be seen in patent documentation morely, for example US2667337 discloses a kind of corrugated pipe with wound fin, its structure is made up of metal circular tube and helical form fin, be formed with ripple on the fin, ripple reduces until disappearance gradually from an extend internally segment distance and width and the degree of depth of outer rim.One of existing shortcoming of this structure because spiral helicine fin is attached on the pipe by welding, therefore, the time regular meeting segregation phenomenon between fin and the pipe body appears, so the poor durability in the use, lack service life; Two, the solder joint position between fin and the pipe body can increase thermal contact resistance and influence heat exchange property; Three owing to be that structure is an one behind the split production, so process is many, Production Time is long.
Again, CN2144290Y has announced a kind of high-efficiency fin heat-transfer pipe, the all rolling spiral groove of the surfaces externally and internally of this heat-transfer pipe, and pressure welding fin band forms high fin in the spiral groove of tube outer surface, the fin band is petal type or corrugated fin band, and this technical scheme is with the deficiency of depositing US2667337.
And CN2657842Y has disclosed a kind of high fin heat exchange pipe producing device, the high fin that only can process straight shape according to its instruction, and straight shape fin heat exchanging effect to improve positive effect very little.
Also, US4337824 has instructed a kind of composite fin tube, adopts the three-high mill one-shot forming to shut out fin (height 2.8mm) and pipe inside spin shape wave groove outside pipe, and at first, its resulting heat exchanger tube is a low finned tube; Secondly, fin is straight wing; Have again, show that according to its specification description and accompanying drawing people are comprehended to obtain petal-shaped or claim corrugated fin, promptly can't obtain heat exchange heat exchanger tube satisfactory for result outside the metal circular tube pipe.
Again, CN2326929Y has disclosed a kind of composite heat exchange tube, constitute by the whole high finned tube of the compound fine aluminium of steel pipe tube wall, adopt finish rolling to constitute to the fin that is compounded on the pure aluminum tube on the steel pipe tube wall, the wing height is 12-14mm, though belong to the high finned tube category, the material consumption that this structure caused is bigger, and the fin that obtains is straight wing.
And, the public all heat exchangers of CN2740988Y are with the seamless high finned tube of copper alloy, adopt three-high mill to revolve the type of rolling into, fin height can reach 20mm, though belong to the high finned tube category, fin structure is straight shape, sees shown in Figure 1, outside body 1, be processed with straight outer fin 2, constitute inner fin 3 in the body 1.
Known to the industry, has only the degree that both satisfies fin height 5-15mm, embody the fin global shape again and be petal or corrugated high fin heat exchange pipe, be only the optional act that is obtained ultimate attainment heat transfer outside a tube area, and be not should not be lengthization fin height simply merely yet, because it is long that tediously long plain fin can cause fluid to flow through the distance of fin surface, speed and temperature boundary layer are thicker and influence heat exchange property, in above-mentioned disclosed document, except the structure that US2667337 recommended, all there is this drawback in all the other patented technology schemes.Yet, because being the helical form fin that will make separately, US2667337 is welded on the metal circular tube, therefore exist described three place's deficiencies, thereby constituted structural one big shortcoming.
Summary of the invention
Task of the present invention be to provide between a kind of fin and the tube wall do not have additional thermal contact resistance, can avoid because of fluid flow through the distance of fin surface too tediously long make speed and temperature boundary layer thickening heat exchanging performance cause disadvantageous, help to improve the heat exchange of the outer gas side of pipe, make the improved high finned heat-exchange tube of the coefficient of heat transfer.
Task of the present invention also is to provide a kind of processing method of high finned heat-exchange tube, can ensure that fin and body structure are as a whole and need not separately fin to be welded on the body.
Task of the present invention is finished like this, a kind of high finned heat-exchange tube, it comprises body and the outer fin that is combined on the tube wall, described outer fin directly extends with the axis direction of helical form towards body at tube wall, and the fin integral body of outer fin alternately is offset and the formation waveform to both sides.
The inwall of body of the present invention constitutes inner fin, and described inner fin shape in the shape of a spiral extends towards the body axis direction.
The inwall of body of the present invention constitutes groove, and described groove shape in the shape of a spiral extends towards the body axis direction.
The height of outer fin of the present invention is 5-20mm, and wing is apart from being 2-5mm, and corrugated wave number is 3-10 on circumference.
The center line of inner fin of the present invention and body is formed with pitch angle alpha will, and the number of degrees of pitch angle alpha will are 20-50 °, and the height of inner fin is 0.2-1.0mm.
An also task of the present invention is finished like this, a kind of processing method of high finned heat-exchange tube, and it may further comprise the steps:
A) choose body on request;
B) be equipped with three groups of each assembling dies that constituted by fluting mould, straight fins shaping mould, corrugated fin shaping mould;
C) body of choosing is placed on the roller Rotary rolling mill;
D) three that three groups of assembling dies are respectively fixed to three roller Rotary rolling mills are rolled on the mold shaft, and around body;
E) drive the work of three roller Rotary rolling mills, by rolling that mold shaft is taken the rotation synchronously of three groups of assembling dies the outer wall of body is molded outer fin and makes the outer fin integral body that is molded alternately shift into waveform to both sides, obtain wing high for 5-20mm, wing apart from being the individual high finned heat-exchange tube of 3-10 for 2-5mm, the number of wave number on circumference.
In one embodiment of the present of invention, steps A) body described in is for being TP2 or T2 copper pipe through the heat treated trade mark, and the tensile strength of this copper pipe be 230-240MPa, percentage elongation 〉=40%, HV value between 40-50, grain size 〉=0.02mm.
In another embodiment of the present invention, the ply bar scot of the assembling die step B), straight fins shaping mould are respectively the disc cutting die, described corrugated fin shaping mould is matched by first, second mould lobe and constitutes, in the form of annular discs, recessed edge and flange have been arranged alternately each other on first, second mould lobe, flange on the first mould lobe matches with recessed edge on the second mould lobe, and the flange on the second mould lobe matches with recessed edge on the first mould lobe.
In another embodiment of the present invention, described recessed edge and flange are positioned at the edge of first, second mould lobe, recessed edge be shaped as hemispherical recessed edge, and flange be shaped as hemispherical flange.
In yet another embodiment of the present invention, described recessed edge be shaped as the recessed edge of semi-cylindrical, described flange be shaped as the semi-cylindrical flange.
Advantage of the present invention: directly constitute the high fin of corrugated at tube wall, strengthened the heat exchange of the outer gas side of pipe, make heat transfer coefficient improve 10%; Compare with the pipe with wound fin in the prior art, eliminated the thermal contact resistance between body and the fin root fully; The bellows-shaped of the high fin of corrugated is by the decision of the track of fin and the relative motion of corrugated fin shaping mould, and bellows-shaped is special, and induced draft trends towards body and deviate from body flowing along the body radial direction, to the horizontal disturbance of air-flow greater than prior art; Method is simple, only needs corresponding corrugated fin shaping mould is set on the basis of prior art, can obtain the corrugated high finned tube, does not therefore need artificially corrugated fin to be welded to outside the body.
Description of drawings
Fig. 1 is the straight high finned tube schematic diagram in the prior art.
Fig. 2 is a high finned heat-exchange tube schematic diagram of the present invention.
Fig. 3 is an embodiment schematic diagram of corrugated fin shaping mould of the present invention.
Fig. 4 is the schematic diagram of three roller Rotary rolling mills of the present invention.
Fig. 5 is the structure chart of the head section of Fig. 4.
Fig. 6 is the cutaway view of Fig. 5.
Fig. 7 is the partial enlarged drawing of Fig. 5.
Fig. 8 is the flat type high finned tube heat transfer property comparison diagram in high finned heat-exchange tube of the present invention and the prior art.
The specific embodiment
Embodiment 1:
Below in conjunction with given the drawings and specific embodiments the present invention is further described below, to help understanding the present invention, but is not construed as limiting the invention.
A) choose through the heat treated trade mark be TP2, tensile strength be 230-240MPa, percentage elongation 〉=40%, HV value between 40-50, the body 1 of grain size 〉=0.02mm, the external diameter of this body 1 is that 19mm, internal diameter are 16.8mm;
B) be equipped with three groups by fluting mould 5 shown in Figure 7, straight fins shaping mould 6 and corrugated fin shaping mould 7 constituted by assembling die shown in Figure 58, fluting mould 5 is just as common cutting blade or claim cutting blade, be used for body 1 outer wall is cut out groove, common every group of fluting mould 5 has many pieces or claim many, present embodiment is chosen as 26 pieces, every group of straight fins shaping mould 6 can be by the 1-3 handle, present embodiment is selected 3, be used for the plain fin of being left by fluting mould 5 is carried out moulding, and corrugated fin shaping mould 7 is selected by structure shown in Figure 3, the corrugated fin shaping mould has a cover for 7 every groups, by shown in Figure 3 first, the second mould lobe 7a, 7b combines, first, the marginal portion that corresponds to each other of the second mould lobe alternately is processed with hemispheric recessed edge and flange;
C) with steps A) selected body 1 is set on the head 10 by Fig. 4, three roller Rotary rolling mills illustrated in Figure 5, and said here three roller Rotary rolling mills preferably adopt and build the model that machinery plant produces by the Qingdao life of Chinese Qingdao of Shandong province is three wire rolling mills of ZC28-16 type;
D) will be by step B) three of being set to by three roller Rotary rolling mills of Fig. 4, Fig. 5, distribution triangular in shape shown in Figure 6 by die sleeve 11 respectively of three groups of assembling dies 8 being equipped with roll on the mold shaft 9, rolling mold shaft 9 is limited in by hold-down nut 12 and rolls on the mold shaft seat 13, rolling mold shaft seat 13 is fixed on and rolls on the die holder 14, roll die holder 14 and connect with track base 15, the guide rail of track base 15 and oil cylinder seat 16 17 is sliding to be joined and connects with the oil cylinder post 19 of oil cylinder 18;
E) drive the work of three roller Rotary rolling mills, with reference to Fig. 4, Fig. 5, Fig. 6, under the action of the power drive mechanism of three roller Rotary rolling mills, earlier by 34 oil-feeds of oil cylinder oil pipe, the oil cylinder post 19 of oil cylinder 18 is stretched, promote track base 15 motions, make and roll die holder 14 motions, roll mold shaft seat 13 motion and three three groups of assembling dies 8 that roll on the mold shaft 9 are contacted with body 1 until making, then motor 21 work are slowed down through reduction box 23, drive hinge wheel 27 by the minor sprocket 22 on reduction box 23 output shafts through chain 24, and then drive gear wheel 28, drive three pinions, 29 rotations that are positioned at gear-box 30 by gear wheel 28, because the gear shaft of pinion 29 is to be connected with an end of power transmission shaft 32 by universal coupling 31, and the other end of power transmission shaft 32 by universal coupling 20 with roll that mold shaft 9 is connected, therefore drive and roll mold shaft 9 rotations, make and be separately fixed at three and roll on the mold shaft 9 three groups each is by fluting mould 5, straight fins shaping mould 6,7 rotations of corrugated fin shaping mould, with the location status shown in scheming is example, be followed successively by fluting mould 5 from left to right, straight fins shaping mould 6, corrugated fin shaping mould 7, the axle sleeve hole 25 of the gear wheel axle sleeve 26 of the aforesaid gear wheel 28 of approach and be what to move from left to right by the body 1 that three groups of combination dies 8 are being seized on both sides by the arms, and scoop out by guide table 39, be respectively equipped with pressure roller stand 38 and snub pulley frame 40 on the guide table 39, be hinged on the last pressure roller stand 38 and go up roller frame 37, the a pair of pressure roller 41 of going up is pivoted on the last roller frame 37, and the snub pulley 35 that is pivoted on the snub pulley frame 40, seized guide roller 33 on both sides by the arms between last pressure roller 41 and the snub pulley 35, the guiding roll shaft 36 of guide roller 33 is supported in the tube chamber accent of body 1, in the process that 8 pairs of bodys 1 of above-mentioned three groups of assembling dies are processed, leave groove by 26 fluting moulds 5 at the outer wall of body 1 earlier, diameter according to general knowledge fluting mould 5 increases gradually, the groove that makes outside body to be offered is deepened gradually, until satisfying to the height of required outer fin 2, after fluting mould 5 is left groove, through 6 moulding of straight fins shaping mould, and then forming alternately skew corrugated of both sides at the outer wall of body 1 by outer fin 2 shown in Figure 2 through corrugated fin shaping mould 7 final molding, the external diameter of resulting outer fin 2 is 40mm, fin thickness is 0.5mm, every meter fin number is 280, body 1 inwall is a hydraulically smooth surface, ripple (wave) number is 8 weekly.In the straight form height finned tube of resulting high finned heat-exchange tube and same size with present embodiment props up than the experiment test experiment, managing outer working medium is air, intraductal working medium is a water, experimental data is shown by Fig. 8, therefore heat transfer coefficient exceeds 10% than straight form height finned tube, and the heat transfer property of the heat-exchange tube of making by the inventive method compared with prior art is significantly improved.Hollow square among Fig. 8 is represented heat-exchange tube of the present invention, and closed square is represented the flat type high finned tube in the prior art, and K represents heat transfer coefficient, and V (m/s) represents face velocity, Coefficient K be example relatively with discharge G=750kg/h.
Embodiment 2:
With step C) when described body 1 places on the three roller Rotary rolling mills, one internal mold is set in body 1, internal mold is smooth cylindrical section, be pulled outwardly at fluting mould 5 and straight fins shaping mould 6 external fins 2 and allocate under the usefulness, the inwall of body 1 is being formed towards the comparatively shallow that ward off of body 1 axis direction extension and by corrugated groove 4 shown in Figure 7 with outer fin 2 corresponding positions, body 1 with groove 4 does not allow too big situation comparatively suitable for tube fluid or tube fluid fluid resistance loss comparatively dirty, fouling easily.All the other are with the description to embodiment 1.
Embodiment 3:
With the height of processing outer gear piece 2 is 5mm, wing apart from being that 2mm, the number of wave number on the circumference pitch angle alpha will that to be 3, inner fin 3 form with the body center line is that 20 °, the height of inner fin 3 are that the high finned heat-exchange tube of 0.2mm is an example.
Only with steps A) body 1 get external diameter 19mm, wall thickness is 1.1mm;
Only with step B) in the thickness of fluting mould 5 get 1.5mm, the point of a knife size begins progressively to increase progressively by 0.1mm from 0.2mm, every group totally 14 the fluting moulds 5, the quantity of every group of straight fins shaping mould 6 is 2, every thickness straight fins shaping mould 6 is got 1.6mm, every group of corrugated fin shaping mould 7 is one, and the right concave and flange quantity that is made into is 6 pairs on first, second mould lobe 7a, the 7b;
With step C) in the feed distance of three roller Rotary rolling mills be adjusted into 6mm, and be that 16.6mm, groove depth 0.2mm, groove number are that 4, pitch angle alpha will are that 20 ° internal mold is fixed in and places on the plug in the body 1 with external diameter, all the other are with the descriptions to embodiment 1.
Embodiment 4:
With the height of processing outer gear piece 2 is 9.5mm, wing apart from being that 3.5mm, the number of wave number on the circumference pitch angle alpha will that to be 5, inner fin 3 form with the body center line is that 30 °, the height of inner fin 3 are that the high finned heat-exchange tube of 0.3mm is an example.
Only with steps A) body 1 get external diameter 22mm, wall thickness is 1.6mm;
Only with step B) in the thickness of fluting mould 5 get 3mm, the point of a knife size begins progressively to increase progressively by 0.1mm from 0.2mm, every group totally 29 the fluting moulds 5, the quantity of every group of straight fins shaping mould 6 is 2, every thickness straight fins shaping mould 6 is got 3.1mm, every group of corrugated fin shaping mould 7 is one, and the right concave and flange quantity that is made into is 9 pairs on first, second mould lobe 7a, the 7b;
With step C) in the feed distance of three roller Rotary rolling mills be adjusted into 10mm, and be that 18.6mm, groove depth 0.3mm, groove number are that 4, pitch angle alpha will are that 30 ° internal mold is fixed in and places on the plug in the body 1 with external diameter, all the other are with the descriptions to embodiment 1.
Embodiment 5:
With the height of processing outer gear piece 2 is 20mm, wing apart from being that 5mm, the number of wave number on the circumference pitch angle alpha will that to be 10, inner fin 3 form with the body center line is that 50 °, the height of inner fin 3 are that the high finned heat-exchange tube of 1mm is an example.
Only with steps A) body 1 get external diameter 28mm, wall thickness is 2.5mm;
Only with step B) in the thickness of fluting mould 5 get 4.5mm, the point of a knife size begins progressively to increase progressively by 0.14mm from 0.3mm, every group totally 30 the fluting moulds 5, the quantity of every group of straight fins shaping mould 6 is 2, every thickness straight fins shaping mould 6 is got 4.6mm, every group of corrugated fin shaping mould 7 is one, and the right concave and flange quantity that is made into is 18 pairs on first, second mould lobe 7a, the 7b;
With step C) in the feed distance of three roller Rotary rolling mills be adjusted into 25mm, and be that 12.8mm, groove depth 1mm, groove number are that 5, pitch angle alpha will are that 50 ° internal mold is fixed in and places on the plug in the body 1 with external diameter, all the other are with the descriptions to embodiment 1.
By the foregoing description as can be known, corrugated outer fin 2 of the present invention is to adopt the fluting mould 5 as grooving tool with straight fins molding cutter 6 material on the body 1 to be become along the outside extrolling spread of body radial direction, and constitute an overall structure with body 1, outer fin 2 extends with screw-like around body 1 at body 1 outer surface, under effect as the corrugated fin shaping mould 7 of corrugated fin molding cutter, alternately be offset or the formation corrugated that extends to fin two side directions, with the heat transfer process of the outer gas side of enhanced tube.
By the foregoing description also as can be known, fluting mould 5 is straight fins processing mould, and straight fins shaping mould 6 is installed on after the fluting mould 5, by its continuation the fin root is processed, unnecessary material is pressed to outer fin 2 and body 1, make pipe thickness even, the global shape of outer fin 2 is regular or claim regular.The corrugated fin shaping mould of being installed after the straight fins shaping mould 67 is formed by a pair of first, second mould lobe 7a, 7b cooperation, concrete shape for the concave and flange on first, second mould lobe 7a, the 7b does not need painstakingly to limit in the present invention, thereby is not subjected to the restriction of embodiment yet.After first, second mould lobe 7a, 7b combined, concave and flange was just in time corresponding, and when corrugated fin shaping mould 7 and outer fin 2 rotate when doing relative motion, flange just marks track one on the fin 2 outside.If establishing the external diameter of body 1 is d
b, the fin external diameter is d
t, the angular speed of body 1 rotation is ω
1, the angular speed of corrugated fin shaping mould 7 rotations is ω
2, the distance between the axle center of the axle center of corrugated fin shaping mould 7 and body 1 is L, and the time is t, and getting the body shaft core position is initial point, promptly (x, y)=(0,0), then this movement locus can calculate with following formula:
x＝rcosθ
y＝rsinθ
Wherein, r=x '
2+ y '
2
θ＝arctan(y’/x’)+ω
1t
x’＝L-Rcos(ω
2t)
y’＝Rsin(ω
2t)
Therefore, according to the movement locus that is marked on the fin 2 outside arbitrarily a bit on the corrugated fin shaping mould 7, can design the position size of concave and flange.
Claims (10)
1, a kind of high finned heat-exchange tube, it comprises body and the outer fin that is combined on the tube wall, it is characterized in that described outer fin directly extends with the axis direction of helical form towards body at tube wall, and the fin integral body of outer fin is offset and the formation waveform alternately to both sides.
2, high finned heat-exchange tube according to claim 1 is characterized in that the inwall of described body constitutes inner fin, and described inner fin shape in the shape of a spiral extends towards the body axis direction.
3, high finned heat-exchange tube according to claim 1 is characterized in that the inwall of described body constitutes groove, and described groove shape in the shape of a spiral extends towards the body axis direction.
4, high finned heat-exchange tube according to claim 1, the height that it is characterized in that described outer fin is 5-20mm, and wing is apart from being 2-5mm, and corrugated wave number is 3-10 on circumference.
5, high finned heat-exchange tube according to claim 2 is characterized in that the center line of described inner fin and body is formed with pitch angle alpha will, and the number of degrees of pitch angle alpha will are 20-50 °, and the height of inner fin is 0.2-1.0mm.
6, a kind of processing method of high finned heat-exchange tube as claimed in claim 1 is characterized in that it may further comprise the steps:
A) choose body on request;
B) be equipped with three groups of each assembling dies that constituted by fluting mould, straight fins shaping mould, corrugated fin shaping mould;
C) body of choosing is placed on the roller Rotary rolling mill;
D) three that three groups of assembling dies are respectively fixed to three roller Rotary rolling mills are rolled on the mold shaft, and around body;
E) drive the work of three roller Rotary rolling mills, by rolling that mold shaft is taken the rotation synchronously of three groups of assembling dies the outer wall of body is molded outer fin and makes the outer fin integral body that is molded alternately shift into waveform to both sides, obtain wing high for 5-20mm, wing apart from being the individual high finned heat-exchange tube of 3-10 for 2-5mm, the number of wave number on circumference.
7, the processing method of high finned heat-exchange tube according to claim 6, it is characterized in that steps A) described in body for through the heat treated trade mark be TP2 or T2 copper pipe, and the tensile strength of this copper pipe be 230-240MPa, percentage elongation 〉=40%, HV value between 40-50, grain size 〉=0.02mm.
8, the processing method of high finned heat-exchange tube according to claim 6, it is characterized in that step B) described in ply bar scot, the straight fins shaping mould of assembling die be respectively the disc cutting die, described corrugated fin shaping mould is matched by first, second mould lobe and constitutes, in the form of annular discs, recessed edge and flange have been arranged alternately each other on first, second mould lobe, flange on the first mould lobe matches with recessed edge on the second mould lobe, and the flange on the second mould lobe matches with recessed edge on the first mould lobe.
9, the processing method of high finned heat-exchange tube according to claim 8 is characterized in that described recessed edge and flange are positioned at the edge of first, second mould lobe, recessed edge be shaped as hemispherical recessed edge, and flange be shaped as hemispherical flange.
10, the processing method of high finned heat-exchange tube according to claim 8, what it is characterized in that described recessed edge is shaped as the recessed edge of semi-cylindrical, described flange be shaped as the semi-cylindrical flange.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2007100199655A CN100442000C (en) | 2007-02-01 | 2007-02-01 | High finned heat-exchange tube and processing method thereof |
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|---|---|---|---|
| CNB2007100199655A CN100442000C (en) | 2007-02-01 | 2007-02-01 | High finned heat-exchange tube and processing method thereof |
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| CN100442000C CN100442000C (en) | 2008-12-10 |
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| CN103157965A (en) * | 2011-12-12 | 2013-06-19 | 浙江宏天铜业有限公司 | Production technology of high-tooth fin copper heat tube |
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Address after: 18, Yang Dong Road, Yangyuan garden, Xinzhuang Town, Changshou City, Jiangsu Province, zip code: 215562 Co-patentee after: University of Shanghai for Science and Technology Patentee after: Jiangsu chi long precision copper tube Limited by Share Ltd Address before: Zip code of Yangyuan, Xinzhuang Town, Changshou City, Jiangsu: 215562 Co-patentee before: University of Shanghai for Science and Technology Patentee before: Jiangsu Cui long Copper Co., Ltd. |
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Effective date of registration: 20200622 Address after: 215562, No. 18 Yang Dong Road, Yang Yang garden, Xinzhuang Town, Suzhou, Jiangsu, Changshou City Patentee after: JIANGSU CUILONG PRECISION COPPER TUBE Corp. Address before: 215562, No. 18 Yang Dong Road, Yang Yang garden, Xinzhuang Town, Jiangsu, Changshou City Co-patentee before: University of Shanghai for Science and Technology Patentee before: JIANGSU CUILONG PRECISION COPPER TUBE Corp. |