CN112756342A - Method for removing oil on inner wall of large-coil-weight internal thread copper pipe - Google Patents
Method for removing oil on inner wall of large-coil-weight internal thread copper pipe Download PDFInfo
- Publication number
- CN112756342A CN112756342A CN202110031309.7A CN202110031309A CN112756342A CN 112756342 A CN112756342 A CN 112756342A CN 202110031309 A CN202110031309 A CN 202110031309A CN 112756342 A CN112756342 A CN 112756342A
- Authority
- CN
- China
- Prior art keywords
- copper pipe
- wall
- pressure
- coil
- oil
- 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 72
- 229910052802 copper Inorganic materials 0.000 title claims abstract description 72
- 239000010949 copper Substances 0.000 title claims abstract description 72
- 238000000034 method Methods 0.000 title claims abstract description 25
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 24
- 238000004519 manufacturing process Methods 0.000 claims abstract description 11
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 11
- 238000010926 purge Methods 0.000 claims abstract description 11
- 238000010438 heat treatment Methods 0.000 claims abstract description 10
- 239000012528 membrane Substances 0.000 claims description 5
- 239000000779 smoke Substances 0.000 abstract description 4
- 238000004378 air conditioning Methods 0.000 abstract description 2
- 238000007599 discharging Methods 0.000 abstract description 2
- 230000003647 oxidation Effects 0.000 abstract description 2
- 238000007254 oxidation reaction Methods 0.000 abstract description 2
- 239000003921 oil Substances 0.000 description 22
- 239000010687 lubricating oil Substances 0.000 description 4
- 238000005406 washing Methods 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 2
- 229910001873 dinitrogen Inorganic materials 0.000 description 2
- 239000003517 fume Substances 0.000 description 2
- 238000000137 annealing Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003599 detergent Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910001338 liquidmetal Inorganic materials 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto
- B08B9/02—Cleaning pipes or tubes or systems of pipes or tubes
- B08B9/027—Cleaning the internal surfaces; Removal of blockages
- B08B9/032—Cleaning the internal surfaces; Removal of blockages by the mechanical action of a moving fluid, e.g. by flushing
- B08B9/0321—Cleaning the internal surfaces; Removal of blockages by the mechanical action of a moving fluid, e.g. by flushing using pressurised, pulsating or purging fluid
- B08B9/0328—Cleaning the internal surfaces; Removal of blockages by the mechanical action of a moving fluid, e.g. by flushing using pressurised, pulsating or purging fluid by purging the pipe with a gas or a mixture of gas and liquid
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B13/00—Accessories or details of general applicability for machines or apparatus for cleaning
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto
- B08B9/02—Cleaning pipes or tubes or systems of pipes or tubes
- B08B9/027—Cleaning the internal surfaces; Removal of blockages
- B08B9/032—Cleaning the internal surfaces; Removal of blockages by the mechanical action of a moving fluid, e.g. by flushing
- B08B9/035—Cleaning the internal surfaces; Removal of blockages by the mechanical action of a moving fluid, e.g. by flushing by suction
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
The invention relates to the technical field of deep processing of air-conditioning copper pipes, in particular to a method for removing oil on the inner wall of a large-coil-weight internal thread copper pipe, which comprises the following processing steps: s1, feeding and purging; s2, heating the copper pipe on line; s3, gradually pressurizing and purging the head of the copper pipe by using nitrogen, and vacuumizing the tail of the copper pipe to form negative pressure; and S4, detecting blanking. The method for removing oil from the inner wall of the large coil weight internal thread copper pipe can achieve the purpose of quickly discharging oil smoke in the copper pipe, reduce the residual oil value of the inner wall of the copper pipe, and simultaneously reduce the risk of oxidation of the inner wall of the copper pipe caused by nitrogen loss in the production process.
Description
Technical Field
The invention relates to the technical field of deep processing of air-conditioning copper pipes, in particular to a method for removing oil on the inner wall of a large-coil-weight internal thread copper pipe.
Background
The precision copper pipe production line basically adopts a drawing process, namely, the copper pipe is processed to the required size through the matching of a die and a core head, the joint drawing, the coil drawing and the forming are all key processes in the production process of the internal thread copper pipe, and the copper pipe is processed in a drawing mode. In the drawing process, the core print rubs with the inner surface of the copper pipe, the die rubs with the outer surface of the copper pipe, if the die and the core print are produced for a long time, the die and the core print are worn, so that the dimensional accuracy of the copper pipe is influenced, and lubricating oil is lubricated between the inner wall and the outer wall of the copper pipe and the core print die in the existing drawing process; the inner wall is called intima oil, and the outer wall is called outer mold oil. However, the internal thread copper pipe needs to be welded in the using process, and residual lubricating oil in the drawing process can cause the copper pipe to be desoldered and leaked, so that the cleaning work of the lubricating oil on the inner surface and the outer surface after the drawing is finished is indispensable. At present, the outer surface of the copper pipe is cleaned on line by using a liquid metal detergent, so that the difficulty is low and the effect is good; but the inner hole of the internal thread copper pipe is smaller; generally within 4-6mm, and the tooth's socket exists on the inner wall for the washing that the inner wall remains lubricating oil can not adopt the same method with copper pipe outer wall washing, and the washing of inner membrance oil all adopts the mode that nitrogen gas sweeps under the high temperature at present, therefore the inner membrance oil flash point that chooses for use all is far less than the heating temperature of copper pipe, and the principle is: the high temperature vaporizes the inner membrane oil, which is then vented with nitrogen. However, the pressure of nitrogen is gradually reduced along with the increase of the length of the copper pipe, the longer the length of the copper pipe is, the greater the difficulty of purging the inner wall is, the higher the oil content value of the inner wall of the copper pipe is, and the length of the single coil of the large coil weight seamless copper pipe with the internal threads is more than 4500m and the weight of the single coil is more than 300kg at present, so that the residual oil value of the inner wall cannot meet the requirements of customers by the existing inner wall purging mode.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: in order to solve the problems in the background art, the method for removing oil from the inner wall of the large-coil-weight internal-threaded copper pipe is provided, the purpose of quickly discharging oil smoke in the copper pipe can be achieved, the residual oil value of the inner wall of the copper pipe is reduced, and meanwhile, the risk of oxidation of the inner wall of the copper pipe caused by nitrogen loss in the production process is also reduced.
The technical scheme adopted by the invention for solving the technical problems is as follows: a method for removing oil on the inner wall of a large-coil-weight internally threaded copper pipe comprises the following processing steps: s1, feeding and purging; s2, heating the copper pipe on line; s3, gradually pressurizing and purging the head of the copper pipe by using nitrogen, and vacuumizing the tail of the copper pipe to form negative pressure; and S4, detecting blanking.
Further, in the above technical solution, in S3, the head pressure is increased step by increasing the pressure of 0.3MPa per 500m, and the head pressure reaches 3MPa when the production reaches 5000 m.
Further, in the above technical solution, a vacuum pump or an exhaust fan is connected to the tail of the copper pipe in S3 to pump and exhaust the inner membrane oil.
Further, in the above technical solution, a pressure difference is formed between the pressure at the head of the copper tube and the pressure at the tail of the copper tube in S3.
The invention has the beneficial effects that: compared with the prior art, the cleaning method greatly reduces the production auxiliary time, reduces the pre-purging time by 90%, basically realizes plug and play, and greatly reduces the labor intensity of personnel and the production efficiency; the mode can reduce the pressure of the nitrogen blown on line, avoid the condition that the outer diameter of the copper pipe is blown large due to overlarge pressure, and has higher safety; according to the mode, the vacuum pump or the exhaust fan pipeline is connected to the tail end, oil smoke at the tail end of the copper pipe is converted into liquid after being filtered, the oil smoke is prevented from entering air, and the environment is effectively protected.
Detailed Description
The application discloses a method for removing oil on the inner wall of a large-coil-weight internal thread copper pipe, which comprises the following processing steps: s1, feeding and purging; s2, heating the copper pipe on line; s3, gradually pressurizing and purging the head of the copper pipe by using nitrogen, and vacuumizing the tail of the copper pipe to form negative pressure; and S4, detecting blanking.
Wherein, in S3, the head pressure is increased step by adopting the pressure of 0.3MPa increased every 500m, and the head pressure reaches 3MPa when the production reaches 5000 m. And a vacuum pump or an exhaust fan is connected to the tail part of the copper pipe in the S3 to pump and exhaust the inner membrane oil. In the step S3, the pressure at the head of the copper tube and the pressure at the tail of the copper tube form a pressure difference.
The operation principle of the method for removing the oil on the inner wall of the large-coil-weight internal thread copper pipe is as follows:
during the annealing process of the copper pipe, residual inner membrane oil on the inner wall of the copper pipe in the heating area is vaporized at high temperature, at the moment, oil fume is mixed with nitrogen, and the gas always flows from a high-pressure part to a low pressure part, so that the high pressure is always kept at the head end of the copper pipe to promote the flow of the nitrogen to always keep from head to tail, and if the pressure at the head end is smaller than the pressure at the position of the copper pipe in the heating area, the oil fume can flow back. In the production process, because of the heating zone copper pipe to the distance of head end longer and longer, pressure can reduce along with the increase of length, consequently need give head end pressure pressurization constantly, just can guarantee that the pressure of head end is greater than the pressure of heating zone position copper pipe always, but the copper pipe plasticity that has annealed is great, and pressure increase can lead to the pipe diameter grow of copper pipe, consequently can not unlimited pressurization. This mode is through the mode that increases the evacuation at the copper pipe tail end, causes the tail end negative pressure, and under the condition that forward pressure received the restriction, further increaseed the pressure differential of heating zone position copper pipe and tail end, ensured that nitrogen gas can continuously flow according to the direction of demand to reach the purpose of inner wall deoiling.
This application has following advantage for traditional deoiling mode: time is saved, and plug and play are realized; the labor intensity of personnel is reduced, the whole production efficiency is improved, the safety coefficient is high, and the environment is effectively protected.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention are equivalent to or changed within the technical scope of the present invention.
Claims (4)
1. A method for removing oil on the inner wall of a large-coil-weight internally threaded copper pipe is characterized by comprising the following processing steps: s1, feeding and purging; s2, heating the copper pipe on line; s3, gradually pressurizing and purging the head of the copper pipe by using nitrogen, and vacuumizing the tail of the copper pipe to form negative pressure; and S4, detecting blanking.
2. The method for removing oil on the inner wall of the large-coil-weight internally-threaded copper pipe according to claim 1, wherein the method comprises the following steps: in S3, the head pressure is increased step by increasing the pressure of 0.3MPa every 500m, and the head pressure reaches 3MPa when the production reaches 5000 m.
3. The method for removing oil on the inner wall of the large-coil-weight internally-threaded copper pipe according to claim 1, wherein the method comprises the following steps: and a vacuum pump or an exhaust fan is connected to the tail part of the copper pipe in the S3 to pump and exhaust the inner membrane oil.
4. The method for removing oil on the inner wall of the large-coil-weight internally-threaded copper pipe according to claim 1, wherein the method comprises the following steps: and pressure difference is formed between the pressure at the head part of the copper pipe and the pressure at the tail part of the copper pipe in the S3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110031309.7A CN112756342A (en) | 2021-01-11 | 2021-01-11 | Method for removing oil on inner wall of large-coil-weight internal thread copper pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110031309.7A CN112756342A (en) | 2021-01-11 | 2021-01-11 | Method for removing oil on inner wall of large-coil-weight internal thread copper pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112756342A true CN112756342A (en) | 2021-05-07 |
Family
ID=75701306
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110031309.7A Pending CN112756342A (en) | 2021-01-11 | 2021-01-11 | Method for removing oil on inner wall of large-coil-weight internal thread copper pipe |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112756342A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100304024A1 (en) * | 2008-08-18 | 2010-12-02 | Cec-Systems Sa | Working process for the treatment of an interior of a pipework system as well as a subdistributor and a working equipment for the treatment of a pipework system |
| CN208643560U (en) * | 2018-08-02 | 2019-03-26 | 海亮奥托铜管（广东）有限公司 | For clearing up the waste-oil scavenger and its blowning installation of copper pipe inner surface greasy dirt |
| CN110081310A (en) * | 2019-05-16 | 2019-08-02 | 秦皇岛玻璃工业研究设计院有限公司 | Online solar control film coating system silane busbar connector and its air supplying operation method |
| CN110560433A (en) * | 2019-09-12 | 2019-12-13 | 广东海亮铜业有限公司 | internal purging method and system for copper pipe large bulk disc production |
| US10596605B1 (en) * | 2016-11-15 | 2020-03-24 | Tri-State Environmental, LLC | Method and apparatus, including hose reel, for cleaning an oil and gas well riser assembly with multiple tools simultaneously |
| CN210546822U (en) * | 2019-07-03 | 2020-05-19 | 江阴和宏精工科技有限公司 | Automatic purging device for inner wall of copper pipe |
-
2021
- 2021-01-11 CN CN202110031309.7A patent/CN112756342A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100304024A1 (en) * | 2008-08-18 | 2010-12-02 | Cec-Systems Sa | Working process for the treatment of an interior of a pipework system as well as a subdistributor and a working equipment for the treatment of a pipework system |
| US10596605B1 (en) * | 2016-11-15 | 2020-03-24 | Tri-State Environmental, LLC | Method and apparatus, including hose reel, for cleaning an oil and gas well riser assembly with multiple tools simultaneously |
| CN208643560U (en) * | 2018-08-02 | 2019-03-26 | 海亮奥托铜管（广东）有限公司 | For clearing up the waste-oil scavenger and its blowning installation of copper pipe inner surface greasy dirt |
| CN110081310A (en) * | 2019-05-16 | 2019-08-02 | 秦皇岛玻璃工业研究设计院有限公司 | Online solar control film coating system silane busbar connector and its air supplying operation method |
| CN210546822U (en) * | 2019-07-03 | 2020-05-19 | 江阴和宏精工科技有限公司 | Automatic purging device for inner wall of copper pipe |
| CN110560433A (en) * | 2019-09-12 | 2019-12-13 | 广东海亮铜业有限公司 | internal purging method and system for copper pipe large bulk disc production |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
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Application publication date: 20210507 |