CN110057212A - Efficient earth source heat pump heat exchanger and spiral copper pipe process equipment - Google Patents
Efficient earth source heat pump heat exchanger and spiral copper pipe process equipment Download PDFInfo
- Publication number
- CN110057212A CN110057212A CN201910414938.0A CN201910414938A CN110057212A CN 110057212 A CN110057212 A CN 110057212A CN 201910414938 A CN201910414938 A CN 201910414938A CN 110057212 A CN110057212 A CN 110057212A
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- China
- Prior art keywords
- copper pipe
- support
- heat exchanger
- pedestal
- heat pump
- 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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Links
- 229910052802 copper Inorganic materials 0.000 title claims abstract description 78
- 239000010949 copper Substances 0.000 title claims abstract description 78
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 title claims abstract description 76
- 238000000034 method Methods 0.000 title claims abstract description 19
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 claims abstract description 20
- 229910000831 Steel Inorganic materials 0.000 claims description 12
- 239000010959 steel Substances 0.000 claims description 12
- 238000009434 installation Methods 0.000 claims description 6
- 230000005540 biological transmission Effects 0.000 claims description 3
- 238000003780 insertion Methods 0.000 claims description 3
- 230000037431 insertion Effects 0.000 claims description 3
- 238000013461 design Methods 0.000 abstract description 3
- 238000012546 transfer Methods 0.000 description 20
- 239000007788 liquid Substances 0.000 description 8
- 239000003507 refrigerant Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 230000033001 locomotion Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 241000208340 Araliaceae Species 0.000 description 1
- 241000233855 Orchidaceae Species 0.000 description 1
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 description 1
- 235000003140 Panax quinquefolius Nutrition 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000004378 air conditioning Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009510 drug design Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 235000008434 ginseng Nutrition 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000008450 motivation Effects 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D53/00—Making other particular articles
- B21D53/02—Making other particular articles heat exchangers or parts thereof, e.g. radiators, condensers fins, headers
- B21D53/06—Making other particular articles heat exchangers or parts thereof, e.g. radiators, condensers fins, headers of metal tubes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
- F28D7/10—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged one within the other, e.g. concentrically
- F28D7/106—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged one within the other, e.g. concentrically consisting of two coaxial conduits or modules of two coaxial conduits
-
- 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)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Geometry (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
The invention discloses one kind to be applied to spiral copper pipe process equipment in efficient earth source heat pump heat exchanger, including pedestal (1), pedestal (1) left end is fixed with base of the carrier head (2), its right end is movably equipped with support base (5), collet (3) are installed on the base of the carrier head (2), are equipped with support core (4) in the collet (3)；Longitudinal leadscrew (7) are installed in the pedestal (1), the longitudinal leadscrew (7) is driven by being installed on pedestal (1) interior sliding motor (8)；Screw thread installs rotator slide (9) and support slide (17) on the longitudinal leadscrew (7), installs support base (5) on the support slide (17).After efficient earth source heat pump heat exchanger of the present invention uses the spiral copper pipe, cell unit building has been successfully applied to it and has concentrated residential quarter, worked well, reached design requirement.
Description
Technical field
The present invention relates to technical field of ground source heat pump, specifically a kind of ground source heat pump efficient heat exchanger and spiral copper pipe processing
Equipment.
Background technique
Earth source heat pump is the completely new renewable energy of one kind of China's rising in recent years, provides refrigeration, heat supply for building
And the technological system of supplying hot water.Currently, domestic application is mainly using Large-scale machine set as building heat supplying (cold)；Using a large-sized unit
Control operation.Such design has the following problems: large-sized unit is unable to branch control；And with small unit, there are small set structures
Complexity, manufacture difficulty is big, and heat transfer efficiency is low.In addition large-sized unit centralized control inconvenient maintenance, is unable to branch control and household metering,
It is unfavorable for reducing user's operating cost.
Summary of the invention
The invention aims to solve deficiency present in above-mentioned technology, provide a kind of ground source heat pump efficient heat exchanger and
The manufacturing process equipment of heat exchanger inside spin copper pipe improves earth source heat pump heat transfer efficiency, convenient for applying on individual small unit.
The present invention is achieved by the following technical scheme:
One kind being applied to spiral copper pipe process equipment in efficient earth source heat pump heat exchanger, including pedestal, the pedestal left end are fixed
It is movably equipped with support base equipped with base of the carrier head, its right end, collet is installed on the base of the carrier head, is equipped with support core in the collet；It is described
Longitudinal leadscrew is installed, the longitudinal leadscrew is driven by being installed on sliding motor in pedestal in pedestal；Spiral shell on the longitudinal leadscrew
Line, which is put on, is equipped with rotator slide and support slide；The rotator slide is fixed on rotating seat bottom surface, on the rotating seat
Rotator is installed, rotary body is installed, the rotary body right end is by transmission mechanism by being located on rotating seat in the rotator
Rotating electric machine driving, the rotary body left end by card slot be equipped with multiple tip-lever supports (i.e. tip-lever support be in can and meanwhile in
The heart is firmly held out against in the slip draw-in groove of copper pipe), mandril is installed on the tip-lever support, more mandrils are circumferentially equal with certain screw pitch
Cloth；The rotary body center passes through copper pipe to be processed, and the copper pipe left end to be processed is inserted into the support core of collet and is pressed from both sides with collet
It fastens, the copper pipe right end to be processed is inserted into supporting core rod, and the supporting core rod is fixed on support base (supporting core rod and branch
Support seat is structure as a whole, and supporting core rod is moved with support base in process), the end of the supporting core rod is in step-like, institute
The outer diameter for stating supporting core rod is identical as the internal diameter of copper pipe to be processed.
When work, copper pipe one end to be processed is fixed at collet first, the branch of certain length is penetrated in the copper pipe other end
Then support base is fixed on support slide by support core bar.The multiple tip-lever support positions in rotary body left end are adjusted, push up mandril firmly
Tight copper pipe simultaneously makes its deformation, i.e., mandril is placed exactly in the step end (taper end) of supporting core rod end at this time, plays support to copper pipe
Effect, and supporting core rod end step end diameter is the inside spin diameter after copper pipe is squeezed and deformed by mandril.Control mandril
In critical field, then rotating electric machine drives rotary body rotation, and synchronous according to calculating for head diameter, i.e. spiral bottom diameter size
Sliding motor driving rotator and the support base of good speed synchronize move right, guarantee that the step end face of supporting core rod is always positioned at
Mandril region, mandril move right while rotating, and under the collective effect of both direction, mandril holds out against copper pipe rotation on one side
Turn, move along a straight line on one side, copper pipe surface is processed multi-head spiral groove just with deformation by copper pipe surface.And in process,
There is a supporting core rod servo-actuated among copper pipe, guarantees that copper pipe inside spin internal diameter keeps certain size, and play a supporting role.
Preferably, to prevent mandril from generating damage to copper pipe when processing copper pipe, friction of the mandril to copper pipe, mandril are reduced
Head can load onto idler wheel or ball, and rotary body under the driving of its motor, is conducive to mandril with the rotation of slow speed and exists simultaneously
Copper pipe surface processes helical form.
A kind of efficient earth source heat pump heat exchanger, including outer steel pipe, the outer steel pipe is interior to be set with interior copper pipe；The interior copper pipe table
Face is machined with helicla flute (i.e. the inner surface of the interior copper pipe has inside spin).
In double-tube heat exchanger, liquid medium in liquid medium and copper pipe in steel pipe, along the hand of spiral in flow process
Relative flow, due to medium spin move when liquid particle touch opportunity increase, heat transfer area increase, formed turbulence intensity
Increase, so heat transfer efficiency improves, thus improves the thermal efficiency of heat exchanger.
The present invention has the advantage that
1, the present invention is mainly suitable for the double-tube heat exchangers of the small unit of earth source heat pump, while can also be applied to other cold and hot exchanges
In equipment.
2, the small unit heat exchanger of earth source heat pump produced by the present invention is advantageously implemented point due to the raising of heat transfer efficiency
Family installation, branch control, household metering keep small unit more energy efficient, and operating cost is lower.
3, the efficient earth source heat pump heat exchanger made of spiral copper pipe of the present invention, has been successfully applied to cell list
First building and concentration residential quarter, work well, have reached design requirement.
The present invention has rational design, has good practical application value.
Detailed description of the invention
Fig. 1 shows spiral copper pipe process equipment schematic diagrames.
Fig. 2 indicates double-tube heat exchanger side view.
Fig. 3 indicates double-tube heat exchanger front view.
Fig. 4 indicates double-tube heat exchanger sectional view.
In figure: 1- pedestal, 2- base of the carrier head, 3- collet, 4- support core, 5- slide bearings, 6- supporting core rod, the longitudinal direction 7- silk
Thick stick, 8- sliding motor, 9- rotator slide, 10- rotating base, 11- rotating electric machine, 12- rotator, 13- rotary body, 14- are passed
Motivation structure, 15- tip-lever support, 16- mandril, 17- support slide, 19- copper pipe to be processed；20- outer steel pipe, copper pipe in 21-, 22- method
Orchid, liquid medium in 23- steel pipe, liquid medium in 24- copper pipe.
Specific embodiment
Specific embodiments of the present invention are described in detail with reference to the accompanying drawing.
Ground-source heat pump system include be embedded in earth's surface ground below coupling pipe, be installed on the ground source energy accumulating system of ground with
And several small units of heat pump.System will carry out 3 heat exchanges when working, by taking winter warms oneself as an example, first is that underground heat and buried pipe
Medium in net swaps, by thermal conductive to the medium in pipe network；Second heat exchange is by double-tube heat exchanger by pipe network
Refrigerant of the interior heat transfer to compression；Third time is to reach room by exchanging with space air after refrigerant absorbs heat and take thermal effect；
And to reach this target, by furtheing investigate heat transfer theory, first is that underground pipe network conducts heat, after wellhole is accomplished fluently, there will be no
Variation；Second is that refrigerant and the air-conditioning technical of air exchange are highly developed, the space very little with promotion is improved；So to mention
High heat transfer efficiency improves the heat transfer efficiency of double-tube heat exchanger, ability only in geothermal medium and the refrigerant exchange process of compression
Realize this target.
It is analyzed according to the heat transfer theory of double-tube heat exchanger, casing heat transmitter is by outer layer pipe (also known as package) and inner tube (copper
Pipe) it forms, medium flows in package, and flow distance claims shell side；In inner tube, (difference has plenty of list to another transfer depending on the application
Pipe, has plenty of tube bank) in flow, the distance of flowing claims tube side；Two media in the absence of external forces parallel motion layer
Stream, forms vortex when there is External force interference when media flow, be turbulent (turbulent flow).The principal element for influencing heat transfer efficiency is heat transfer
The intensity of area and turbulent flow, heat transfer area is bigger, and turbulence intensity is stronger, and heat transfer efficiency is bigger.And the present invention is exactly by heat exchanger
In the helical structure of copper pipe processing, which makes the existing external spiral of copper pipe, and has inside spin, stream in spiral copper pipe
Dynamic is band thermal medium (generally water) fetched from underground, and what is flowed between steel pipe and copper pipe is refrigerant.Due to tube construction
Uniqueness makes tube side and shell side be in screw simultaneously, improves turbulence intensity.The heat transfer coefficient of heat exchanger is compared with usual heat exchanger
It is high by 30 ~ 40%, and pressure drop is almost equal, and heat transfer has been greatly improved, copper pipe is inside and outside to form really adverse current, without friction, no baffling
Element saves space, reduces costs, and improves heat transfer efficiency, forms this high-performance heat exchanger.
And to make the technical matters of heat exchanger helical copper pipe, it is necessary to manufacture a special equipment, this equipment is by copper pipe
Process helically shaped, different according to copper pipe diameter, spiral may be designed as 3 spirals, 4 spirals and 6 spirals；Screw pitch can be straight by copper pipe
Diameter size is adjusted；Special plane will keep copper pipe motionless or slow rotation at work, and rotator had not only done longitudinal movement, but also
It makes rotating motion；It is specific as follows:
One kind being applied to spiral copper pipe process equipment in efficient earth source heat pump heat exchanger, including pedestal 1, and the fixation of 1 left end of pedestal is set
There are base of the carrier head 2, its right end to be movably equipped with support base 5, collet 3 is installed on base of the carrier head 2, is equipped with support core 4 in collet 3；Peace in pedestal 1
Longitudinal leadscrew 7 is filled, longitudinal leadscrew 7 is driven by being installed on sliding motor 8 in pedestal 1；Screw thread installation rotator is sliding on longitudinal leadscrew 7
Seat 9 and support slide 17；Rotator slide 9 is fixed on 10 bottom surface of rotating seat, installs rotator 12, rotator 12 on rotating seat 10
Interior installation rotary body 13(rotary body 13 can be installed in rotator 12 by various ways such as bearing or support wheels), rotation
13 right end of body is driven by transmission mechanism 14 by the rotating electric machine 11 being located on rotating seat 10, and specially 13 right end of rotary body is located at
Outside rotator 12, it is connected by power by the modes such as belt, rack gear or chain and rotating electric machine.13 left end of rotary body passes through
There are four tip-lever support 15, four tip-lever supports are symmetrically positioned in mutually perpendicular four direction, pacify on each tip-lever support 15 for card slot installation
Mandril 16 is filled, and is further fixed by jackscrew, then four mandrils 16 are circumferentially uniformly distributed with certain screw pitch, then by adjusting top
Installation site of the pole socket in card slot, and then adjust four mandrils and firmly hold out against copper pipe to center.13 center of rotary body pass through to
Copper pipe 19 is processed, 19 left end of copper pipe to be processed is inserted into the support core 4 of collet 3 and is fixedly clamped with collet 3, and copper pipe 19 to be processed is right
End insertion supporting core rod 6, supporting core rod 6 is fixed in slide bearings 5, and the end of supporting core rod 6 is in step-like, i.e., when four
After mandril holds out against copper pipe to be processed (copper pipe wall thickness 1mm or so) simultaneously, copper pipe surface deforms, that is, squeezes to supporting core rod
The step end (mandril further cannot squeeze copper pipe at this time) of end, the outer diameter of supporting core rod 6 and copper pipe 17 to be processed
Internal diameter is identical (note: the step end outer diameter of supporting core rod end is less than the outer diameter of supporting core rod), plays a supporting role, protects to copper pipe
It is constant to hold internal diameter of copper pipe.
When work, 19 one end of copper pipe to be processed is fixed at collet 3 first, supporting core rod 6 is penetrated in the copper pipe other end.
13 left end of rotary body 4,15 position of tip-lever support is adjusted, mandril 16 is made firmly to hold out against copper pipe and makes its deformation, i.e., mandril 16 is being just at this time
It is located at the step end (taper end) of 6 end of supporting core rod well, plays a supporting role to copper pipe, and 6 end step end of supporting core rod
Diameter is the inside spin diameter after copper pipe is squeezed and deformed by mandril.4 mandril head diameters are controlled, i.e. spiral bottom diameter size exists
In critical field, then rotating electric machine 11 drives rotary body 13 to rotate, and synchronous according to the speed sliding motor 8 calculated driving
Rotator 12 and support base synchronize move right, guarantee that the step end face of supporting core rod 6 is always positioned at 16 region of mandril, mandril 16
Move right while rotating, under the collective effect of both direction, mandril 16 on one side hold out against copper pipe rotation, while straight line fortune
Dynamic, copper pipe surface just with deformation, copper pipe surface is processed spiral.And there is a support in process, among copper pipe
Core bar is servo-actuated, guarantees that copper pipe inside spin internal diameter keeps certain size, and play a supporting role.
A kind of efficient earth source heat pump heat exchanger, including outer steel pipe 20,20 inner sleeve of outer steel pipe load onto the interior copper pipe after stating processing
21, which has inside spin (i.e. its surface processes helicla flute), and the both ends of outer steel pipe 20 are equipped with connecting flange 22.Such as
Fig. 2, shown in 3, double-tube heat exchanger can be integrally formed helical form or other existing structures again.As shown in figure 4, steel liquid in pipe
Liquid medium 24 does reverse flow in medium 23 and copper pipe, along hand of spiral relative flow in flow process, due to medium
Spin move when liquid particle touch opportunity increase, heat transfer area increase, formed turbulence intensity increase, so heat transfer efficiency
It improves, thus improves the thermal efficiency of heat exchanger.
It should be noted last that the above examples are only used to illustrate the technical scheme of the present invention and are not limiting, although ginseng
It is described in detail according to the embodiment of the present invention, those skilled in the art should understand that, to technical solution of the present invention
It is modified or replaced equivalently, without departure from the spirit and scope of technical solution of the present invention, this right should all be covered by
In the protection scope of claim.
Claims (3)
1. one kind is applied to spiral copper pipe process equipment in efficient earth source heat pump heat exchanger, it is characterised in that: including pedestal (1),
Pedestal (1) left end is fixed with base of the carrier head (2), its right end is movably equipped with support base (5), installs on the base of the carrier head (2)
Collet (3), the collet (3) is interior to be equipped with support core (4)；Longitudinal leadscrew (7) are installed in the pedestal (1), the longitudinal leadscrew (7)
By being installed on pedestal (1) interior sliding motor (8) driving；Screw thread installation rotator slide (9) and support on the longitudinal leadscrew (7)
Slide (17) installs support base (5) on the support slide (17)；The rotator slide (9) is fixed on rotating seat (10) bottom
Rotator (12) are installed on the rotating seat (10) in face, install rotary body (13) in the rotator (12), the rotary body
(13) right end is driven by transmission mechanism (14) by the rotating electric machine (11) being located on rotating seat (10), and the rotary body (13) is left
End is equipped with multiple tip-lever supports (15) by card slot, installs mandril (16) on the tip-lever support (15), more mandrils (16) are along week
To uniformly；Rotary body (13) center passes through copper pipe to be processed (19), copper pipe (19) left end insertion collet (3) to be processed
Support core (4) on and be fixedly clamped with collet (3), copper pipe (19) right end insertion supporting core rod (6) to be processed, the support
Core bar (6) is fixed on support base (5), and the end of the supporting core rod (6) is in step-like, the outer diameter of the supporting core rod (6)
It is identical as the internal diameter of copper pipe to be processed (17).
2. according to claim 1 be applied to spiral copper pipe process equipment in efficient earth source heat pump heat exchanger, feature exists
In: mandril (16) head is equipped with idler wheel or ball.
3. a kind of efficient earth source heat pump heat exchanger, including outer steel pipe (20), the outer steel pipe (20) is interior to be set with interior copper pipe (21)；Its
Be characterized in that: interior copper pipe (21) surface has multi-head spiral groove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910414938.0A CN110057212B (en) | 2019-05-17 | 2019-05-17 | High-efficiency ground source heat pump heat exchanger and spiral copper pipe processing equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910414938.0A CN110057212B (en) | 2019-05-17 | 2019-05-17 | High-efficiency ground source heat pump heat exchanger and spiral copper pipe processing equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110057212A true CN110057212A (en) | 2019-07-26 |
| CN110057212B CN110057212B (en) | 2024-04-19 |
Family
ID=67323575
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910414938.0A Active CN110057212B (en) | 2019-05-17 | 2019-05-17 | High-efficiency ground source heat pump heat exchanger and spiral copper pipe processing equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110057212B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113522608A (en) * | 2021-07-08 | 2021-10-22 | 湖南天卓管业有限公司 | Intelligent epoxy powder anti-corrosion spiral steel pipe production equipment |
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| KR101813630B1 (en) * | 2017-08-21 | 2017-12-29 | 주식회사 대동씨앤씨 | Apparatus for Forming Spiral Tube and Manufacture Method of Spiral Tube |
| CN209961026U (en) * | 2019-05-17 | 2020-01-17 | 山西新源谷能源科技有限公司 | Efficient ground source heat pump heat exchanger and spiral copper pipe processing equipment |
-
2019
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|---|---|---|---|---|
| GB191301734A (en) * | 1913-01-21 | 1914-04-21 | Louis Herman Brinkman | Improvements in Metal Tube Corrugating Machines. |
| JPS61209729A (en) * | 1985-03-14 | 1986-09-18 | Maeda Tekkosho:Kk | Method and device for forming spiral waveform on metallic cylindrical pipe |
| CN2207242Y (en) * | 1994-05-05 | 1995-09-13 | 刘�英 | Metal tube inner surface spiral groove shaping apparatus |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113522608A (en) * | 2021-07-08 | 2021-10-22 | 湖南天卓管业有限公司 | Intelligent epoxy powder anti-corrosion spiral steel pipe production equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110057212B (en) | 2024-04-19 |
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