CN109404617A - A kind of Special-shape internal screw copper pipe - Google Patents
A kind of Special-shape internal screw copper pipe Download PDFInfo
- Publication number
- CN109404617A CN109404617A CN201811485022.6A CN201811485022A CN109404617A CN 109404617 A CN109404617 A CN 109404617A CN 201811485022 A CN201811485022 A CN 201811485022A CN 109404617 A CN109404617 A CN 109404617A
- Authority
- CN
- China
- Prior art keywords
- internal screw
- copper pipe
- special
- tube body
- workbench
- 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.)
- Pending
Links
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 title claims abstract description 46
- 229910052802 copper Inorganic materials 0.000 title claims abstract description 46
- 239000010949 copper Substances 0.000 title claims abstract description 46
- 238000000465 moulding Methods 0.000 claims description 23
- 238000009826 distribution Methods 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 238000003754 machining Methods 0.000 abstract description 2
- 239000003990 capacitor Substances 0.000 description 8
- 238000010586 diagram Methods 0.000 description 6
- 230000005540 biological transmission Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000004378 air conditioning Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L9/00—Rigid pipes
- F16L9/02—Rigid pipes of metal
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F1/00—Tubular elements; Assemblies of tubular elements
- F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
- F28F1/40—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only inside the tubular element
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Geometry (AREA)
- Thermal Sciences (AREA)
- Transmission Devices (AREA)
Abstract
Invention describes a kind of Special-shape internal screw copper pipes, it includes tube body, and the tube body is cylindrical shape, and sliding slot is equipped at intervals on the outer wall of the tube body, and the sliding slot is axially distributed along tube body, and internal screw thread is equipped on the inner wall of the tube body；The sliding slot is arc-shaped structure, and the internal diameter of sliding slot is 3-8mm, is equipped with chamfering in the edge of sliding slot；The helical angle of the internal screw thread is 5 ~ 21 °, and the addendum angle of the internal screw thread is 3 ~ 70 °, a height of 0.02 ~ 0.45mm of the tooth of the internal screw thread.Special-shape internal screw copper pipe machining accuracy with higher of the invention, can not only meet the use demand of client, and reliability is preferable, and cost of manufacture is relatively low, can reduce the production cost of enterprise, and have preferable versatility.
Description
Technical field
The present invention relates to the processing of specially shaped copper tube, especially a kind of Special-shape internal screw copper pipe belongs to copper pipe processing technology neck
Domain.
Background technique
Now currently, high-precision copper pipe is operation of air conditioning systems, the upper important material of cable communication equipment, and have extensively
Application, since required precision of these equipment for copper pipe is higher, during making high-precision copper pipe, to production
The requirement of each process on line is also very high.With the extensive use of high-precision copper pipe, more clients add in deisgn product
The structure of specially shaped copper tube is entered, so that the use demand of special-shaped high-precision copper pipe increases, still, currently on the market, has not had also
There is matched special-shaped high-precision copper pipe product, therefore, this is also this field urgent problem.
Summary of the invention
For above-mentioned deficiency in the prior art, it is a primary object of the present invention to solve now to lack abnormity currently on the market
The problem of high-precision copper pipe product, and introduce that a kind of precision is higher, the preferable Special-shape internal screw copper pipe of reliability.
Technical solution of the present invention: a kind of Special-shape internal screw copper pipe, which is characterized in that including tube body, the tube body is circle
Barrel shape is equipped at intervals with sliding slot on the outer wall of the tube body, and the sliding slot is axially distributed along tube body, in the inner wall of the tube body
It is equipped with internal screw thread；The sliding slot is arc-shaped structure, and the internal diameter of sliding slot is 3-8mm, is equipped with chamfering in the edge of sliding slot；
The helical angle of the internal screw thread is 5 ~ 21 °, and the addendum angle of the internal screw thread is 3 ~ 70 °, the tooth of the internal screw thread a height of 0.02 ~
0.45mm。
Optimally, the internal screw thread is in spiral distribution along 45 ° of inboard wall of tube body.
Further, the tube body using copper pipe molding equipment be made, the copper pipe molding equipment include include workbench,
Supporting leg is provided with below the workbench, the upper end of the workbench is provided with fixed block, the lower end setting of the workbench
There is first motor, feed wheel is provided with above the fixed block, the side of the feed wheel is provided with aligns wheel, the aligning
The front of wheel is provided with erection support in the upper end of the workbench, and the erection support is internally provided with screw rod, the screw rod
Front end be provided with handwheel, the side of the screw rod is provided with guide rod, and the side of the aligns wheel is provided with briquetting roller, the work
The side for making platform is provided with bracket, and the second motor is provided on the bracket, is provided with disk in front of second motor, institute
It states disk and is connect with second motor by spline, slideway is provided on the disk, is provided with shaping axle in the slideway
Set, the molding axle sleeve are bolted connection with the disk, and the front end of the workbench is provided with controller.
The controller includes the chip IC of model UNO-2170, the first pin connection resistance R4's of the chip IC
One end, the other end of resistance R4 be separately connected one end of resistance R3, the 6th pin of chip IC, diode D2 anode and resistance
One end of R2, the other end of the resistance R3 are separately connected the cathode of diode D1, the second pin of chip IC, diode D4
Anode, one end of resistance R10, the anode of diode D6 and the positive of signal input part V1, the diode D1 connect resistance R1
One end, the other end of resistance R1 is separately connected the other end of resistance R2, one end of capacitor C1, the cathode of diode D3, resistance
One end of R7, one end of resistance R9, the collector of triode D5, one end of capacitor C2 and diode D9 anode, capacitor C1's
The other end is separately connected the cathode of diode D2 and the 5th pin of chip IC, and the anode of diode D3 is separately connected resistance R5's
One end, the third pin of chip IC and resistance R6 one end, resistance R5 the other end connection chip IC the 4th pin, resistance R6
The other end connection diode D4 cathode；The other end of the resistance R7 is separately connected the other end of resistance R10, resistance R8
The emitter of one end and triode D5, the base stage of triode D5 are separately connected the other end of resistance R8 and the other end of resistance R9,
The other end of the capacitor C2 be separately connected the collector of triode D7, the cathode of diode D8, triode D7 emitter and
One end of inductance L, the anode of the diode D8 are separately connected the cathode of diode D9, the other end of inductance L and signal output
Hold V2, the cathode of the base stage connection diode D6 of the triode D7.
It is preferred: on-off button, the controller and the on-off button, first electricity are provided on the controller
Machine, second motor are connected by the connecting wire.So set, the controller is used to control the movement of executive component
Whether, the transmission and control of signal are convenient for by connecting wire connection.
Preferred: by being welded to connect, the fixed block and the workbench pass through spiral shell for the supporting leg and the workbench
It tethers and connects.So set, the supporting leg ensure that certain bonding strength for playing the role of support, by being welded to connect,
It is bolted and just carries out installation fixation between the two with interconnected.
Preferred: the first motor is connected by screw to the workbench, the feed wheel and the first motor
It is connected by key.So set, the first motor is used to provide power for the rotation of the feed wheel, it is connected by key and is convenient for
The transmission moved.
Preferred: the aligns wheel is connect with the fixed block by shaft, and the erection support and the workbench are logical
Cross welded connecting.So set, the aligns wheel ensure that the strong of connection for playing the role of aligning, by being welded to connect
Degree.
Preferred: the screw rod is connected through a screw thread with the erection support, and the handwheel and the screw rod pass through welding
Connection.So set, the screw rod is used to play the role of passing movement, it is connected through a screw thread convenient for the rotation of the screw rod,
By being welded to connect so that firm and reliable connection between the handwheel and the screw rod.
Preferred: the briquetting roller is connect with the fixed block by shaft, and second motor passes through with the bracket
It is bolted.So set, the briquetting roller is for squeezing copper pipe molding, the rotation that second motor is used for as the disk
Power is provided.
Compared with the existing technology, the invention has the following advantages:
1, Special-shape internal screw copper pipe machining accuracy with higher of the invention, can not only meet the use demand of client, and
And reliability is preferable.
2, cost of manufacture is relatively low, can reduce the production cost of enterprise, and have preferable versatility.
3, the present invention allows molding axle sleeve to carry out slidable adjustment on it by the way that slideway is arranged, in order to obtain difference
The shaped article of size shape；By be arranged screw rod the distance before and after aligns wheel is adjusted, so as to improve this at
The scope of application of type equipment, and molding equipment of simple structure and strong practicability in the present invention, it is applied widely, facilitate and is grasped
It controls.
Detailed description of the invention
Fig. 1 is the structure sectional view of Special-shape internal screw copper pipe of the present invention.
Fig. 2 is the external structure schematic diagram of Special-shape internal screw copper pipe of the present invention.
Fig. 3 is the structural schematic diagram of copper pipe molding equipment used in the present invention.
Fig. 4 is the mounting structure schematic diagram of copper pipe molding equipment used in the present invention.
Fig. 5 is the structural schematic diagram of the aligns wheel of copper pipe molding equipment used in the present invention.
Fig. 6 is the circuit structure flow diagram of copper pipe molding equipment used in the present invention.
Fig. 7 is the circuit diagram of controller in the present invention.
In figure, 1, supporting leg；2, first motor；3, workbench；4, connecting wire；5, controller；6, on-off button；7, hand
Wheel；8, disk；9, axle sleeve is formed；10, slideway；11, bracket；12, the second motor；13, briquetting roller；14, aligns wheel；15, it installs
Support；16, guide rod；17, fixed block；18, feed wheel；19, screw rod；20, tube body；21, sliding slot；22, internal screw thread.
Specific embodiment
Present invention will be further explained below with reference to the attached drawings and specific embodiments.
Embodiment 1:
As shown in Fig. 1-Fig. 7, in the present invention, a kind of Special-shape internal screw copper pipe, it includes tube body 20, and the tube body 20 is cylindrical shape
Shape is equipped at intervals with sliding slot 21 on the outer wall of the tube body 20, and the sliding slot 21 is along the axial distribution of tube body 20, in the tube body 20
Inner wall be equipped with internal screw thread 22；The sliding slot 21 is arc-shaped structure, and the internal diameter of sliding slot 21 is 3-8mm, in sliding slot 21
Edge is equipped with chamfering；The helical angle of the internal screw thread 22 can be 5 °, 6 °, 8 °, 12 °, 15 °, 17 °, 19 ° or 21 °, described interior
The addendum angle of screw thread 22 can be 3 °, 14 °, 25 °, 36 °, 44 °, 48 °, 53 °, 58 °, 65 °, 69 ° or 70 °, the internal screw thread 22
Tooth height can be 0.02mm, 0.08mm, 0.15mm, 0.23mm, 0.32mm, 0.38mm, 0.40mm, 0.42mm or 0.45mm；
The internal screw thread 22 is in spiral distribution along 45 ° of 20 inner wall of tube body.
In the present invention, the tube body 20 is made using copper pipe molding equipment, and the copper pipe molding equipment includes workbench 3,
The lower section of workbench 3 is provided with supporting leg 1, and the upper end of workbench 3 is provided with fixed block 17, and the lower end of workbench 3 is provided with first
Motor 2, first motor 2 are used to provide power, and the top of fixed block 17 is provided with feed wheel 18, and the side of feed wheel 18 is provided with
The front of aligns wheel 14, aligns wheel 14 is provided with erection support 15 in the upper end of workbench 3, and erection support 15 is for playing installation
Fixed effect, erection support 15 are internally provided with screw rod 19, and the front end of screw rod 19 is provided with handwheel 7, and the side of screw rod 19 is set
It is equipped with guide rod 16, the side of aligns wheel 14 is provided with briquetting roller 13, and the side of workbench 3 is provided with bracket 11, sets on bracket 11
It is equipped with the second motor 12, the second motor 12 is used to provide power for the rotation of disk 8, and the front of the second motor 12 is provided with disk
8, disk 8 is connect with the second motor 12 by spline, and slideway 10 is provided on disk 8, and molding axle sleeve 9 is provided in slideway 10,
Molding axle sleeve 9 is bolted connection with disk 8, and the front end of workbench 3 is provided with controller 5, and controller 5 is held for controlling
Whether the movement of units.
Embodiment 2
The present embodiment the difference from embodiment 1 is that:
On-off button 6 is provided on the controller 5, controller 5 passes through with on-off button 6, first motor 2, the second motor 12
Connecting wire 4 connects, and whether controller 5 is used to control the movement of executive component, is convenient for signal by the connection of connecting wire 4
Transmission and control.
In the present invention, dedicated copper pipe molding equipment is used, its working principle is that: round tube is passed sequentially through into feed wheel 18
Feeding is carried out, is then aligned by aligns wheel 14, the scope of application of the device can be improved by adjusting handle 7, with suitable
The round tube of different thicknesses is answered, is then formed under the action of briquetting roller 13, special-shaped round tube is wrapped in molding axle sleeve 9 after molding
On, the specially shaped copper tube finished product of different shape size can be formed it by the way that molding axle sleeve 9 is adjusted, the second motor 12 is used
Endlessly power is provided in the rotation for disk 8.
Referring to Fig. 7, in the present invention, the controller 5 includes the chip IC of model UNO-2170, and the of the chip IC
One pin connects one end of resistance R4, and the other end of resistance R4 is separately connected one end of resistance R3, the 6th pin of chip IC, two
The anode of pole pipe D2 and one end of resistance R2, the other end of the resistance R3 are separately connected the cathode of diode D1, chip IC
Second pin, the anode of diode D4, one end of resistance R10, the anode of diode D6 and signal input part V1, the diode
One end of the anode connection resistance R1 of D1, the other end of resistance R1 are separately connected the other end of resistance R2, one end of capacitor C1, two
The cathode of pole pipe D3, one end of resistance R7, one end of resistance R9, the collector of triode D5, one end of capacitor C2 and diode
The anode of D9, the other end of capacitor C1 are separately connected the cathode of diode D2 and the 5th pin of chip IC, and diode D3 is just
Pole is separately connected one end of one end of resistance R5, the third pin of chip IC and resistance R6, and the other end of resistance R5 connects chip
The 4th pin of IC, the cathode of the other end connection diode D4 of resistance R6；The other end of the resistance R7 is separately connected resistance
The other end of R10, one end of resistance R8 and triode D5 emitter, the base stage of triode D5 is separately connected the another of resistance R8
End and resistance R9 the other end, the other end of the capacitor C2 be separately connected the collector of triode D7, diode D8 cathode,
The emitter of triode D7 and one end of inductance L, the anode of the diode D8 are separately connected the cathode of diode D9, inductance L
The other end and signal output end V2, the triode D7 base stage connection diode D6 cathode.
Special-shape internal screw copper pipe of the invention is the specially shaped copper tube for being exclusively used in special installation first, and is used dedicated
Molding equipment makes, therefore has high production efficiency, and the high feature of qualification rate after molding also solves existing market for different
The problem of demand of shape copper pipe.
It should be noted that above embodiments are only to illustrate technical solution of the present invention rather than restriction technologies scheme, although
The invention is described in detail with reference to the preferred embodiments by applicant, those skilled in the art should understand that, those are right
The modification or equivalent replacement that technical solution of the present invention carries out, cannot be detached from the objective and range of the technical program, should all cover
In scope of the invention as claimed.
Claims (9)
1. a kind of Special-shape internal screw copper pipe, which is characterized in that including tube body (20), the tube body (20) is cylindrical shape, in institute
It states and is equipped at intervals on the outer wall of tube body (20) sliding slot (21), the sliding slot (21) is axially distributed along tube body (20), in the tube body
(20) inner wall is equipped with internal screw thread (22)；The sliding slot (21) is arc-shaped structure, and the internal diameter of sliding slot (21) is 3-8mm,
Chamfering is equipped in the edge of sliding slot (21)；The helical angle of the internal screw thread (22) is 5 ~ 21 °, the tooth top of the internal screw thread (22)
Angle is 3 ~ 70 °, a height of 0.02 ~ 0.45mm of tooth of the internal screw thread (22).
2. Special-shape internal screw copper pipe according to claim 1, which is characterized in that the internal screw thread (22) is along tube body (20)
45 ° of inner wall in spiral distribution.
3. Special-shape internal screw copper pipe according to claim 2, which is characterized in that the tube body (20) is set using copper pipe molding
It prepares, the copper pipe molding equipment includes workbench (3), is provided with supporting leg (1), the work below the workbench (3)
The upper end for making platform (3) is provided with fixed block (17), and the lower end of the workbench (3) is provided with first motor (2), the fixed block
(17) it is provided with above feed wheel (18), the side of the feed wheel (18) is provided with aligns wheel (14), the aligns wheel
(14) front is provided with erection support (15) in the upper end of the workbench (3), and the erection support (15) is internally provided with
The front end of screw rod (19), the screw rod (19) is provided with handwheel (7), and the side of the screw rod (19) is provided with guide rod (16), institute
The side for stating aligns wheel (14) is provided with briquetting roller (13), and the side of the workbench (3) is provided with bracket (11), the bracket
(11) it is provided on the second motor (12), is provided with disk (8) in front of second motor (12), the disk (8) and institute
It states the second motor (12) to connect by spline, be provided with slideway (10) on the disk (8), is provided with into the slideway (10)
Profile shaft set (9), the molding axle sleeve (9) are bolted connection with the disk (8), and the front end of the workbench (3) is set
It is equipped with controller (5), the side of the controller (5) is provided with connecting wire (4).
4. Special-shape internal screw copper pipe according to claim 3, which is characterized in that be provided with on-off on the controller (5)
Button (6), the controller (5) and the on-off button (6), the first motor (2), second motor (12) pass through institute
State connecting wire (4) connection.
5. Special-shape internal screw copper pipe according to claim 4, which is characterized in that the supporting leg (1) and the workbench (3)
By being welded to connect, the fixed block (17) is bolted with the workbench (3).
6. Special-shape internal screw copper pipe according to claim 5, which is characterized in that the first motor (2) and the work
Platform (3) is connected by screw to, and the feed wheel (18) is connected by key with the first motor (2).
7. Special-shape internal screw copper pipe according to claim 6, which is characterized in that the aligns wheel (14) and the fixed block
(17) it is connected by shaft, the erection support (15) and the workbench (3) pass through welded connecting.
8. Special-shape internal screw copper pipe according to claim 7, which is characterized in that the screw rod (19) and the erection support
(15) it is connected through a screw thread, the handwheel (7) and the screw rod (19) pass through welded connecting.
9. Special-shape internal screw copper pipe according to claim 8, which is characterized in that the briquetting roller (13) and the fixed block
(17) it is connected by shaft, second motor (12) is bolted with the bracket (11).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811485022.6A CN109404617A (en) | 2018-12-06 | 2018-12-06 | A kind of Special-shape internal screw copper pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811485022.6A CN109404617A (en) | 2018-12-06 | 2018-12-06 | A kind of Special-shape internal screw copper pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109404617A true CN109404617A (en) | 2019-03-01 |
Family
ID=65457451
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811485022.6A Pending CN109404617A (en) | 2018-12-06 | 2018-12-06 | A kind of Special-shape internal screw copper pipe |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109404617A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021027088A1 (en) * | 2019-08-13 | 2021-02-18 | 北京英翔博瑞耐火材料科技有限公司 | Heat exchange device and manufacturing method therefor |
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|---|---|---|---|---|
| JP2005121156A (en) * | 2003-10-17 | 2005-05-12 | Usui Kokusai Sangyo Kaisha Ltd | Fluid pipe having heat radiating/absorbing function |
| CN201885619U (en) * | 2010-12-02 | 2011-06-29 | 珠海格力电器股份有限公司 | Heat exchange tube and air conditioner heat exchanger comprising same |
| CN202377433U (en) * | 2011-12-23 | 2012-08-15 | 青岛营上电器有限公司 | Special-pipe evaporator forming device |
| CN202393281U (en) * | 2012-01-05 | 2012-08-22 | 金龙精密铜管集团股份有限公司 | Internal-thread copper pipe |
| CN103691835A (en) * | 2013-12-18 | 2014-04-02 | 珠海市科箭自动化设备有限公司 | Capillary full-automatic winding machine |
| CN203991851U (en) * | 2014-07-30 | 2014-12-10 | 庆阳长荣机械设备制造有限公司 | A kind of spiral bending tube device |
| CN204514153U (en) * | 2015-02-14 | 2015-07-29 | 嘉禾工具有限公司 | A kind of two screw thread copper pipe |
| CN209309489U (en) * | 2018-12-06 | 2019-08-27 | 重庆龙煜精密铜管有限公司 | A kind of Special-shape internal screw copper pipe |
-
2018
- 2018-12-06 CN CN201811485022.6A patent/CN109404617A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005121156A (en) * | 2003-10-17 | 2005-05-12 | Usui Kokusai Sangyo Kaisha Ltd | Fluid pipe having heat radiating/absorbing function |
| CN201885619U (en) * | 2010-12-02 | 2011-06-29 | 珠海格力电器股份有限公司 | Heat exchange tube and air conditioner heat exchanger comprising same |
| CN202377433U (en) * | 2011-12-23 | 2012-08-15 | 青岛营上电器有限公司 | Special-pipe evaporator forming device |
| CN202393281U (en) * | 2012-01-05 | 2012-08-22 | 金龙精密铜管集团股份有限公司 | Internal-thread copper pipe |
| CN103691835A (en) * | 2013-12-18 | 2014-04-02 | 珠海市科箭自动化设备有限公司 | Capillary full-automatic winding machine |
| CN203991851U (en) * | 2014-07-30 | 2014-12-10 | 庆阳长荣机械设备制造有限公司 | A kind of spiral bending tube device |
| CN204514153U (en) * | 2015-02-14 | 2015-07-29 | 嘉禾工具有限公司 | A kind of two screw thread copper pipe |
| CN209309489U (en) * | 2018-12-06 | 2019-08-27 | 重庆龙煜精密铜管有限公司 | A kind of Special-shape internal screw copper pipe |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021027088A1 (en) * | 2019-08-13 | 2021-02-18 | 北京英翔博瑞耐火材料科技有限公司 | Heat exchange device and manufacturing method therefor |
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