A device for adsorbing oil fume from inner thread copper pipe
By using oil fume adsorption and anti-backflow devices in the production process of internally threaded copper tubes, combined with low-viscosity inner film oil, the problem of excessive residual oil on the inner wall has been solved, achieving low residual oil and environmentally friendly copper tube production, meeting customer requirements and extending service life.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- NINGBO JINTIAN COPPER TUBE
- Filing Date
- 2022-08-26
- Publication Date
- 2026-05-15
AI Technical Summary
In the current production process of internally threaded copper tubes, it is difficult to control the residual oil content on the inner wall to below 2.5 mg/m2, which affects the welding quality and refrigeration effect, and also causes oil fume pollution to the environment.
An internally threaded copper tube oil fume adsorption device and an anti-backflow oil fume device are adopted. By setting adsorption mechanisms and anti-backflow devices before and after the online annealing process, the oil fume exhaust gas in the copper tube is adsorbed and the inert gas is prevented from being drawn back. Combined with the use of low-viscosity inner film oil, the amount of residual oil on the inner wall of the copper tube is reduced.
It effectively reduces the amount of residual oil on the inner wall of copper pipes, meets customer standards, extends the service life of copper pipes, and improves the quality of the working environment.
Smart Images
Figure CN115518995B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the technical field of non-ferrous metal processing, and in particular to an internally threaded copper tube oil fume adsorption device. Background Technology
[0002] Internally threaded tubes, due to their numerous and regular internal threads, not only increase the heat exchange area compared to conventional smooth tubes but also create turbulence, resulting in a 20%–30% higher heat exchange efficiency. However, in actual production, the presence of grooves on the inner wall of internally threaded tubes leads to lower inner wall cleanliness compared to smooth copper tubes. In particular, internal oil residue can remain on the inner wall during the internal threading process and is difficult to remove. Currently, the main internally threaded copper tube specification used in the air conditioning industry is φ7mm. The national standard GB / T 17791-2017, "Seamless Copper Alloy Tubes for Air Conditioning and Refrigeration Equipment," stipulates that the residual oil value on the inner surface of copper tubes used in refrigerators should not exceed 7 mg / m², while Japanese customers require a residual oil value of no more than 2.5 mg / m² (equivalent to no more than 0.1 mg / m for φ7mm internally threaded copper tubes). This is because residual oil on the inner surface of the copper tube affects the welding quality and can subsequently react chemically with the air conditioning refrigerant, reducing the cooling effect. In particular, during the use of air conditioners, the oil residue on the inner surface of the copper pipes will react chemically with water and air to produce weak acid substances, causing corrosion of the inner wall of the copper pipes and shortening their service life.
[0003] The manufacturing process of internally threaded copper tubes is as follows: horizontal continuous casting—milling and drawing (milling, rolling, and continuous drawing)—coil drawing—online annealing—internal thread forming—horizontal rewinding—finished product annealing. Among these, the continuous drawing, coil drawing, and internal thread forming processes require the injection of a certain amount of inner film oil into the inner surface of the copper tube before stretching to ensure the quality of the inner surface. Furthermore, due to the large stretching rate of the copper tube in the continuous drawing and coil drawing processes, the required viscosity of the inner film oil is high, resulting in a large amount of residual oil on the inner wall of the copper tube after annealing. In particular, during the final finished product annealing process, the residual oil inside the copper tube will decompose and vaporize during heating and will be discharged from the tail end of the copper tube, causing the annealing furnace to be filled with oil fumes. During the cooling stage in the furnace, the copper tube will draw back the oil fumes, leading to a high residual oil value on the inner wall of the tube.
[0004] To address these issues, existing technologies primarily focus on improving the composition of the inner membrane oil to reduce residual oil levels. However, the goal is to ensure that the residual oil on the inner surface of copper pipes does not exceed 2.5 mg / m². 2 In addition to meeting the stringent requirements, it is also necessary to optimize the design of auxiliary devices based on the internal thread copper tube production process in order to produce high-cleanliness internal thread copper tubes with low residual oil on the inner wall, thereby meeting customer residual oil standards and improving the service life of copper tubes. Summary of the Invention
[0005] The purpose of this invention is to provide a processing method for internally threaded copper tubes, an oil fume adsorption and anti-oil fume backflow device, to solve the above-mentioned technical problems.
[0006] The technical solution adopted in this invention is as follows:
[0007] A processing method for internally threaded copper tubes includes an internally threaded copper tube oil fume adsorption device and an internally threaded copper tube anti-oil fume backflow device. The internally threaded copper tube oil fume adsorption device includes an online annealing feeding frame disposed at the feeding end of the online induction annealing process, an online annealing unloading frame disposed at the receiving end of the online induction annealing process, a ventilation connecting vertical rod disposed within the online annealing feeding frame, and an adsorption mechanism disposed outside the online annealing feeding frame and the online annealing unloading frame.
[0008] The internally threaded copper tube anti-oil fume backflow device includes an air guide head on the annealing blow rod and a conical air-blocking cover inside the annealing blow rod.
[0009] The processing method includes:
[0010] S1. Horizontal continuous casting: The copper liquid is drawn into ingots with an outer diameter of φ90.5~93.5mm and a wall thickness of 24.5~27mm by horizontal continuous casting.
[0011] S2, Milling and drawing: A 1000kg ingot is drawn into a tube blank with an outer diameter of φ29.5-30.5mm and a wall thickness of 1.45~1.55mm by milling and drawing.
[0012] S3, Coil drawing: The copper tube blank is continuously drawn 3 to 8 times through the coil drawing method to draw the copper tube to the specifications of the mother tube with an outer diameter of φ6.35~19.05mm and a wall thickness of 0.26~0.8mm.
[0013] S4. Online induction annealing: Connect the tail end of the copper tube to the ventilation connection vertical rod in the online annealing feeding frame. After the head of the copper tube passes through the online annealing equipment in the online induction annealing process for online annealing, it is connected to the adsorption mechanism outside the online annealing unloading frame to adsorb the oil fume exhaust gas in the copper tube.
[0014] S5. Internal thread forming: Add inner film oil to the inner wall of the tube blank in the online annealing and feeding zone to form an internal thread;
[0015] S6. Horizontal rewinding: The produced internally threaded copper tubes are horizontally rewound and refined into coils.
[0016] S7. Finished product annealing in roller hearth furnace: Inert gas is pumped into the gas guide head on the annealing blow rod in the finished product annealing process of roller hearth furnace. The inert gas blows open the conical gas baffle and enters the annealing blow rod, and is blown towards the inner wall of the copper tube through the annealing blow rod.
[0017] As a preferred option, in S3, a certain amount of KN140 inner film oil needs to be added to the copper tube before all the stretching passes of the finished product in the coil drawing process.
[0018] As a preferred option, in S3, before the finished product pass of the coil drawing process, an inner film oil of model DRAW560 needs to be added into the copper tube, and the amount of inner film oil added is 80~100ml.
[0019] Preferably, in S5, the inner film oil added to the inner wall of the tube blank in the online annealing feeding zone is of type DRAW560, and the amount added is 90~120ml.
[0020] Preferably, the internally threaded copper tube is formed by annealing the finished product in a roller hearth furnace, and the residual oil value of the internally threaded copper tube is 0.5~2.5 mg / m2, and the average grain size of the internally threaded copper tube is 0.010~0.015 mm.
[0021] An oil fume adsorption device for an internally threaded copper tube includes an online annealing feeding frame located at the feeding end of the online induction annealing process and an online annealing unloading frame located at the receiving end of the online induction annealing process. Each of the online annealing feeding frame and the online annealing unloading frame has a feeding frame lifting port. The online annealing feeding frame also has a ventilation connecting vertical rod. An adsorption mechanism is located outside each of the online annealing feeding frame and the online annealing unloading frame. The adsorption mechanism outside the online annealing feeding frame is connected to the upper end of the ventilation connecting vertical rod, and the lower end of the ventilation connecting vertical rod is used to connect to the tail end of the copper tube. The adsorption mechanism outside the online annealing unloading frame is connected to the head end of the copper tube.
[0022] As a further preferred embodiment, each of the adsorption mechanisms includes
[0023] First support;
[0024] Second support;
[0025] A rotating connecting sleeve is disposed at the upper end of the first bracket;
[0026] A first driving component is mounted on a first bracket, and the output shaft of the first driving component is movably connected to the rotary connecting sleeve.
[0027] A pipe fitting, which is rotatably disposed at one end of the first bracket;
[0028] A ventilation pipe, one end of which is disposed on the rotating connecting sleeve, and the other end of which is connected to the outlet gas at the upper end of the pipe joint;
[0029] A disc is located at the lower end of the pipe joint, and the disc is rotatably engaged with the lifting port of the feeding frame;
[0030] A connecting rod, wherein the connecting rod is a tubular structure, and one end of the connecting rod is connected to the air inlet of the pipe joint;
[0031] The second driving component is mounted on the second bracket, and its output shaft is connected to the rotating connecting sleeve via a connecting mechanism.
[0032] A threaded copper tube anti-oil fume backflow device is used to be installed on an annealing purge rod. The annealing purge rod has an air inlet and includes an air guide head, a conical air shield, and a spring. The air guide head is located on the annealing purge rod and has an interconnected air guide head inlet and an air guide head inner hole. The air guide head inner hole communicates with the air inlet. The conical air shield is located inside the annealing purge rod, with one side of the conical air shield facing the air inlet, and the other side of the conical air shield connected to the inner wall of the annealing purge rod via the spring.
[0033] As a further preferred embodiment, the device also includes a metal positioning gasket and a graphite sealing ring, wherein the graphite sealing ring is fitted onto one outer edge of the air guide head, and the metal positioning gasket is fitted onto the outer edge of the graphite sealing ring.
[0034] As a further preferred embodiment, a metal sealing gasket is also included, wherein the gas guide head and the annealing purge rod are provided with the metal sealing gasket, the metal sealing gasket having a through hole, and the gas guide head inlet, the gas guide head inner hole, the through hole and the air inlet being coaxially arranged.
[0035] The above technical solution has the following advantages or beneficial effects:
[0036] In this invention, DRAW560 inner film oil is used in the final drawing and forming stretching process. It has low viscosity and good lubricity. During the stretching process, the oil film thickness formed on the inner wall of the copper tube is small. In addition, DRAW560 inner film oil has a low pyrolysis temperature and is easy to volatilize, which can effectively reduce the amount of residual oil on the inner wall of the copper tube.
[0037] In this invention, by setting up an internally threaded copper tube oil fume adsorption device before and after the online annealing process, the oil fume vaporized inside the copper tube during the online annealing heating process can be absorbed, preventing the oil fume from re-adhering after cooling inside the copper tube, thereby reducing the amount of residual oil on the inner wall of the copper tube; at the same time, it can also effectively prevent the vaporized oil fume inside the copper tube from being emitted into the air, reducing environmental pollution and improving the quality of the working environment for employees.
[0038] In this invention, by setting an internally threaded copper tube anti-oil fume backflow device on the air inlet of the finished annealing purge rod, it is not only convenient to introduce inert protective gas into the annealing purge rod, but also effectively prevent the gas inside the annealing purge rod from being blown back out of the air inlet after the inert gas purge is completed. Secondly, the conical gas baffle is conical, which can ensure the sealing of the air inlet after the gas is blown, effectively preventing the oil fume gas in the furnace atmosphere during the annealing process from being drawn back into the inner wall of the copper tube, avoiding the oil fume from entering the copper tube for secondary cooling and condensation, thereby reducing the residual oil value on the inner wall of the copper tube. Attached Figure Description
[0039] Figure 1 This is a flowchart of the processing method for the internally threaded copper tube in this invention;
[0040] Figure 2 This is a schematic diagram of the online annealing feeding frame in the internally threaded copper tube oil fume adsorption device of the present invention;
[0041] Figure 3 This is a schematic diagram of the adsorption mechanism in the internally threaded copper tube oil fume adsorption device of the present invention.
[0042] Figure 4 This is a schematic diagram of the structure of the adsorption mechanism and the online annealing discharge frame in the internally threaded copper tube oil fume adsorption device of the present invention.
[0043] Figure 5 This is an assembly diagram of the internally threaded copper tube oil fume adsorption device in this invention.
[0044] Figure 6 This is a schematic diagram of the assembly of the internally threaded copper tube anti-oil fume backflow device and the annealed blow-off rod in this invention;
[0045] Figure 7 yes Figure 6 Sectional view along the middle AA direction;
[0046] Figure 8 This is a schematic diagram of the conical air-blocking hood in the internally threaded copper tube anti-oil fume backflow device of the present invention;
[0047] Figure 9 This is a cross-sectional view of the conical air-blocking hood in the internally threaded copper tube anti-oil fume backflow device of the present invention;
[0048] Figure 10 This is a schematic diagram of the structure of the metal positioning gasket in the internal threaded copper tube anti-oil fume backflow device of the present invention;
[0049] Figure 11 This is a cross-sectional view of the graphite sealing ring in the internal threaded copper tube anti-oil fume backflow device of the present invention;
[0050] Figure 12 Application status diagram of the internally threaded copper tube anti-oil fume backflow device in this invention.
[0051] In the diagram: 1. Internally threaded copper pipe oil fume adsorption device; 101. Online annealing feeding frame; 102. Feeding frame lifting port; 103. Ventilation connecting vertical rod; 104. Inner frame; 105. Adsorption mechanism; 106. First support; 107. Second support; 108. Rotary connecting sleeve; 109. First driving component; 110. Pipe joint; 111. Ventilation pipe; 112. Disc; 113. Connecting rod; 114. Second driving component; 115. Connecting plate; 116. Fixed shaft; 117. Online... 1. Annealing feeding frame; 2. Internal threaded copper tube anti-oil fume backflow device; 201. Air guide head; 202. Conical air baffle; 203. Spring; 204. Air guide head inlet; 205. Air guide head inner hole; 206. Metal positioning gasket; 207. Graphite sealing ring; 208. Screw hole; 209. Metal sealing gasket; 3. Online annealing equipment; 4. Annealing blow rod; 401. Air inlet; 5. Annealing material rack; 6. Copper tube coil; 7. Ventilation pipeline; 8. First ventilation branch; 9. Second ventilation branch. Detailed Implementation
[0052] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0053] In the description of this invention, it should be noted that terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, terms such as "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0054] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.
[0055] Figure 1This is a flowchart of the processing method for the internally threaded copper tube in this invention; Figure 2 This is a schematic diagram of the online annealing and feeding frame in the internally threaded copper tube oil fume adsorption device of the present invention; Figure 3 This is a schematic diagram of the adsorption mechanism in the internally threaded copper tube oil fume adsorption device of the present invention. Figure 4 This is a schematic diagram of the structure of the adsorption mechanism and the online annealing discharge frame in the internally threaded copper tube oil fume adsorption device of the present invention. Figure 5 This is an assembly diagram of the internally threaded copper tube oil fume adsorption device in this invention. Figure 6 This is a schematic diagram of the assembly of the internally threaded copper tube anti-oil fume backflow device and the annealed blow-off rod in this invention; Figure 7 yes Figure 6 Sectional view along the middle AA direction; Figure 8 This is a schematic diagram of the conical air-blocking hood in the internally threaded copper tube anti-oil fume backflow device of the present invention; Figure 9 This is a cross-sectional view of the conical air-blocking hood in the internally threaded copper tube anti-oil fume backflow device of the present invention; Figure 10 This is a schematic diagram of the structure of the metal positioning gasket in the internal threaded copper tube anti-oil fume backflow device of the present invention; Figure 11 This is a cross-sectional view of the graphite sealing ring in the internal threaded copper tube anti-oil fume backflow device of the present invention; Figure 12 Please refer to the application status diagram of the internally threaded copper tube anti-oil fume backflow device in this invention. Figures 1 to 12 As shown, a preferred embodiment is illustrated, illustrating a processing method for an internally threaded copper tube, including an internally threaded copper tube oil fume adsorption device 1 and an internally threaded copper tube anti-oil fume backflow device 2. The internally threaded copper tube oil fume adsorption device 1 includes an online annealing loading frame 101 disposed at the feeding end and receiving end of the online induction annealing process, an online annealing unloading frame 117 disposed at the receiving end of the online induction annealing process, a ventilation connecting vertical rod 103 disposed within the online annealing loading frame 101, and an adsorption mechanism 105 disposed outside the online annealing loading frame 101 and the online annealing unloading frame 117.
[0056] The internal threaded copper tube oil fume adsorption device 1 of this invention generates negative pressure during the processing of internal threaded copper tubes to adsorb oil fume waste gas in the copper tubes, reducing the adhesion of oil fume waste gas to the inner wall of the copper tubes. The internal threaded copper tube anti-oil fume backflow device 2 is used to blow high-pressure inert protective gas into the copper tubes during the final annealing process. It can also prevent the protective gas in the annealing purge rod 4 from flowing out in reverse, and can also prevent oil fume in the furnace from entering the inner wall of the copper tube through the gas guide head 201 during the annealing process, thus reducing the amount of residual oil on the inner wall of the copper tubes.
[0057] The internal threaded copper tube anti-oil fume backflow device 2 includes an air guide head 201 mounted on the annealing purge rod 4 and a conical air-blocking cover 202 mounted inside the annealing purge rod 4. In this embodiment, the internal threaded copper tube oil fume adsorption device 1 and the internal threaded copper tube anti-oil fume backflow device 2 are applied during the processing of the internal threaded copper tube. Through the setting of the internal threaded copper tube oil fume adsorption device 1 and the internal threaded copper tube anti-oil fume backflow device 2, the residual oil content of the finished internal threaded copper tube reaches 0.5~2.5 mg / m2, and the average grain size of the internal threaded copper tube is 0.010~0.015mm, which can meet the customer's residual oil standard while improving the service life of the copper tube.
[0058] The processing methods for internally threaded copper tubes include:
[0059] S1. Horizontal continuous casting: The molten copper is drawn into ingots with an outer diameter of φ90.5~93.5mm and a wall thickness of 24.5~27mm through horizontal continuous casting. In the process of horizontal continuous casting, the molten copper needs to be drawn into ingots with an outer diameter of φ92.8mm and a wall thickness of 25.6mm through horizontal continuous casting.
[0060] S2. Milling and drawing: A 1000kg ingot is drawn into a connected tube blank with an outer diameter of φ29.5-30.5mm and a wall thickness of 1.45~1.55mm by milling and drawing; the ingot is drawn into a connected tube blank with an outer diameter of φ30.2mm and a wall thickness of 1.5mm by milling and drawing.
[0061] S3. Coil drawing: The copper tube blank is continuously drawn 3 to 8 times using a coil drawing method to draw the copper tube to the specifications of a mother tube with an outer diameter of φ6.35~19.05mm and a wall thickness of 0.26~0.8mm. Before each final drawing pass during the coil drawing process, 80~100ml of DRAW560 inner film oil needs to be added to the copper tube. In this embodiment, the copper tube blank is first continuously drawn seven times using a coil drawing method to draw the copper tube to the specifications of an outer diameter of φ9.52mm and a wall thickness of 0.36mm. Before the first six drawing passes, a certain amount of KN140 inner film oil needs to be added to the copper tube, and before the final drawing pass, 90ml of DRAW560 inner film oil is added to effectively reduce the residue of the inner film oil in the copper tube.
[0062] S4. Online induction annealing: The tail end of the copper tube is connected to the ventilation connecting rod 103 inside the online annealing feeding frame 101. The head end of the copper tube passes through the online annealing equipment 3 in the online induction annealing process for online annealing and is then connected to the adsorption mechanism 105 outside the online annealing unloading frame 117 to adsorb the oil fume exhaust gas in the copper tube. In this embodiment, the tail end of the copper tube is first connected to the lower port of the ventilation connecting rod 103 at the unloading end, and the ventilation connecting rod 103 is connected to a negative pressure fan through a connecting rod 113, a pipe joint 110, and a ventilation pipe 111. The head end of the copper tube is directly and tightly connected to the connecting rod 113 in the adsorption mechanism 105 outside the online annealing unloading frame 117 after passing through the online annealing equipment 3. Before the online annealing process, high-pressure nitrogen gas of 20MPa needs to be blown into the inside of the copper tube for 30 minutes to prevent oxidation of the inner wall of the copper tube during the online annealing process.
[0063] S5. Internal thread forming: Add inner film oil to the inner wall of the tube blank in the online annealing and blanking area to form an internal thread; the type of inner film oil added is DRAW560, and the amount added is 90~120ml. In this embodiment, the amount added is 100ml. The specification of the internal thread is φ7*0.24+0.15mm (φ outer diameter * wall thickness + tooth height).
[0064] S6. Horizontal rewinding: The produced internally threaded copper tubes are horizontally rewound and refined into coils.
[0065] S7. Finished product annealing in roller hearth furnace: Inert gas is pumped into the gas guide head 201 on the annealing blow rod 4 in the finished product annealing process of roller hearth furnace. The inert gas blows open the conical gas baffle 202 and enters the annealing blow rod 4. The inert gas is then blown towards the inner wall of the copper tube through the annealing blow rod 4.
[0066] The above describes a preferred processing method for the internally threaded copper tube of the invention. A comparative example with the processing method of the internally threaded copper tube of the present invention is described below:
[0067] Comparative Cases:
[0068] Step S1: The molten copper is drawn into ingots with an outer diameter of φ90.5~93.5mm and a wall thickness of 24.5~27mm through horizontal continuous casting. Each ingot weighs about 1000kg.
[0069] Step S2: The 1000kg ingot is milled and stretched to form a tube blank with an outer diameter of φ29.5~30.5mm and a wall thickness of 1.45~1.55mm.
[0070] Step S3: The coiled tube blank is stretched 7 times continuously to stretch the copper tube to a specification of φ9.52mm outer diameter and 0.36mm wall thickness.
[0071] Step S4: Connect the copper tube at the tail of the tray to 20MPa high-pressure purging nitrogen and purge for 30 minutes; then hoist the purged copper tube to the online annealing loading area and directly perform online induction annealing.
[0072] Step S5: Add inner film oil to the inner wall of the online annealed tube blank for forming production. The final forming specification is φ7*0.24+0.15mm internal thread (φ outer diameter * wall thickness + tooth height).
[0073] Step S6: The internally threaded copper tube produced in S5 is horizontally rewound and refined into a coil.
[0074] Step S7: Place the coiled material on the annealing rack. One end of the copper tube coiled material is connected to the annealing purging rod through a pipe fitting and pipe, and purged with high-pressure nitrogen.
[0075] The table below shows the process parameters and residual oil values of the finished products in the embodiments and comparative cases of the present invention:
[0076] serial number The last oil grade in the pan Does online annealing use a negative pressure adsorption device? Internal thread forming inner film oil products Does the annealing purging process use an anti-backflow device? Residual oil content in finished product (mg) Residual oil value of finished product 1 (mg / m2) (Target ≤2.5mg / m2) Residual oil value of finished product 2 (mg / m2) (target ≤0.1mg / m2) This embodiment DRAW560 yes DRAW560 yes 0.054 1.37 0.054 Comparison Case 1 Hongrun KN-140 yes DRAW560 yes 0.126 3.19 0.126 Comparison Case 2 DRAW560 no DRAW560 yes 0.156 3.95 0.156 Comparison Case 3 DRAW560 yes Hongrun KN-140 yes 0.122 3.09 0.122 Comparison Case 4 DRAW560 yes DRAW560 no 0.226 5.72 0.226
[0077] Note: The residual oil value of the finished product is tested according to Appendix B, "Determination Method of Oil Content on the Inner Surface of Copper Tubes," of GB / T 17791-2017 "Seamless Copper Alloy Tubes for Air Conditioning and Refrigeration Equipment." It is expressed as the amount of residual oil per square meter of the inner surface of the copper tube. The residual oil value 2 is expressed according to the Japanese customer's method, as the amount of residual oil per meter of copper tube. Both methods use the same method to test the residual oil content on the inner surface of the copper tube, and the residual oil values for φ7mm internal threads are equivalent.
[0078] As shown in the table above, the final residual oil value in the pipe of this embodiment is 1.37 mg / m³. 2 Meeting the needs of Japanese customers at 2.5mg / m² 2 The following requirements apply. However, the residual oil value on the inner wall of the copper pipe in Comparative Cases 1 to 4 all failed to meet the requirement of 2.5 mg / m³. 2 The following requirements apply. Furthermore, the results from Comparative Cases 1 to 4 show that the anti-backflow device during annealing has the greatest impact on the residual oil value inside the pipe, followed by the online annealing anti-backflow device, while the type of oil used in the final drawing stage and the forming inner film has a relatively small impact on the residual oil value inside the pipe.
[0079] The following describes the internally threaded copper tube oil fume adsorption device 1 involved in this invention:
[0080] An internally threaded copper tube fume adsorption device 1 includes an online annealing loading frame 101 located at the feeding end of the online induction annealing process and an online annealing unloading frame 117 located at the receiving end of the online induction annealing process. Each of the online annealing loading frame 101 and the online annealing unloading frame 117 has a feeding frame lifting port 102. The online annealing loading frame 101 also has a ventilation connecting vertical rod 103. Each of the online annealing loading frame 101 and the online annealing unloading frame 117 has an adsorption mechanism 105 located outside. The adsorption mechanism 105 outside the online annealing loading frame 101 is connected to the upper end of the ventilation connecting vertical rod 103, and the lower end of the ventilation connecting vertical rod 103 is used to connect to the tail end of the copper tube. The adsorption mechanism 105 outside the online annealing unloading frame 117 is connected to the head end of the copper tube. In this embodiment, the internally threaded copper tube fume adsorption device 1 is divided into two parts, respectively located at the feeding end and the receiving end of the online induction annealing process. Among them, see Figure 2 , Figure 4 As shown, the online annealing loading frame 101 and the online annealing unloading frame 117 have an inner frame 104 for winding copper tubes. The unloading frame lifting port 102 is located inside the inner frame 104. The online annealing unloading frame 117 does not have a venting connecting vertical rod 103. The venting connecting vertical rod 103 in the online annealing loading frame 101 is located inside the inner frame 104. An annular base is provided at the bottom of the inner frame 104. The lower end of the venting connecting vertical rod 103 is connected to the base. An air hole is provided on the base, and one end of the copper tube can be connected to the air hole. The lower end of the venting connecting vertical rod 103 is connected to the copper tube through the base. Alternatively, the lower end of the venting connecting vertical rod 103 can be directly connected to the copper tube without being connected to the base, thus ensuring that the oil fumes generated inside the copper tube during the online annealing heating process can be fully adsorbed and collected. The upper end of the venting connecting vertical rod 103 is used to connect to the adsorption mechanism 105.
[0081] Furthermore, as a preferred embodiment, each adsorption mechanism 105 includes
[0082] First support 106;
[0083] Second support 107; in this embodiment, the first support 106 and the second support 107 are fixed to the ground.
[0084] A rotating connecting sleeve 108 is disposed on the upper end of the first bracket 106; the rotating connecting sleeve 108 is movably sleeved on the upper end of the first bracket 106 and can rotate and rise relative to the first bracket 106.
[0085] The first driving member 109 is mounted on the first bracket 106, and its output shaft is movably connected to the rotating connecting sleeve 108. The output shaft of the first driving member 109 is vertically arranged and is used to drive the rotating connecting sleeve 108 to move up and down, so that the disc 112 can be operably attached to and detached from the feeding frame lifting port 102 through the first driving member 109. After the disc 112 is attached to the feeding frame lifting port 102, it can rotate with the rotation of the online annealing feeding frame 101 or the online annealing feeding frame 117. An arc-shaped hole is provided at the bottom of the rotating connecting sleeve 108, and the output end of the first driving member 109 is located in the arc-shaped hole and slides in the arc-shaped hole to avoid the first driving member 109 interfering with the rotation of the rotating connecting sleeve 108.
[0086] Pipe connector 110 is rotatably disposed at one end of the first bracket 106; see also Figure 3 As shown, the upper end of the second bracket 107 has a crossbar, and one end of the crossbar has a mounting hole, in which the pipe connector 110 is rotatably disposed. The middle part of the pipe connector 10 is spherically shaped to facilitate rotation within the mounting hole. Both the upper and lower ends of the pipe connector 10 are tubular.
[0087] Ventilation pipe 111, one end of which is mounted on rotating connecting sleeve 108, and the other end of which is connected to the outlet gas at the upper end of pipe joint 110; the other end of ventilation pipe 111 is fixedly connected to pipe joint 110, and ventilation pipe 111 can drive pipe joint 110 to rotate within the mounting hole, and ventilation pipe 111 is used to transmit flue gas.
[0088] The disc 112 is located at the lower end of the pipe joint 110 and rotates with the feeding frame lifting port 102. The disc 112 partially enters the feeding frame lifting port 102 and rotates synchronously with the feeding frame lifting port 102 during production.
[0089] The connecting rod 113 is a tubular structure. One end of the connecting rod 113 is connected to the air inlet at the lower end of the pipe connector 110, and the other end is connected to the upper end of the ventilation connecting vertical rod 103. In this embodiment, the disc 112 is installed at the lower end of the pipe connector 110, and when the pipe connector 110 rotates, it can drive the disc 112 to rotate within the material discharge frame lifting port 102. The connecting rod 113 is connected to the pipe connector 110. The ventilation pipe 111 is a steel pipe, and an air pipe is provided at the other end of the ventilation pipe 111. The air pipe can be connected to a negative pressure fan. When the negative pressure fan is working, it generates suction, which creates negative pressure inside the pipe connector 110, thereby creating negative pressure inside the connecting rod 113 and the ventilation connecting vertical rod 103, adsorbing the oily fumes and exhaust gases inside the copper pipe. The other end of the connecting rod 113 is connected to the upper end of the ventilation connecting vertical rod 103. Among them, the other end of the connecting rod 113 in the adsorption mechanism 105 located outside the online annealing feeding frame 101 is connected to the upper port of the ventilation connecting vertical rod 103, and the other end of the connecting rod 113 in the adsorption mechanism 105 located outside the online annealing unloading frame 117 is connected to the head of the copper tube.
[0090] The second driving member 114 is mounted on the second bracket 107, and its output shaft is connected to the rotating connecting sleeve 108 via a connecting mechanism. (See also...) Figure 3 As shown, the connecting mechanism includes a connecting plate 115, on which a fixed shaft 116 is provided. The output shaft of the second driving member 114 is connected to the fixed shaft 116 via a fixing ring. The fixing ring is sleeved on the outer edge of the fixed shaft 116 and can rotate and slide up and down relative to the fixed shaft 116. The second driving member 114 is hinged to the second bracket 107. The second driving member 114 can drive the rotating connecting sleeve 108 to rotate, thereby causing the disc 112 to be operably positioned directly above the material feeding frame lifting port 102. Both the first driving member 109 and the second driving member 114 are cylinders.
[0091] The following describes the internally threaded copper tube anti-oil fume backflow device 2 involved in this invention:
[0092] A threaded copper tube anti-oil fume backflow device 2 is used to be installed on an annealing purge rod 4. The annealing purge rod 4 has an air inlet 401 and includes an air guide head 201, a conical air baffle 202 and a spring 203. The air guide head 201 is located on the annealing purge rod 4 and has an air guide head inlet 204 and an air guide head inner hole 205 that are interconnected. The air guide head inner hole 205 is connected to the air inlet 401. The conical air baffle 202 is located inside the annealing purge rod 4. One side of the conical air baffle 202 faces the air inlet 401, and the other side of the conical air baffle 202 is connected to the inner wall of the annealing purge rod 4 through the spring 203. In this embodiment, the gas inlet 204 on the gas guide head 201 is connected to the gas guide head inner hole 205, and the gas guide head inner hole 205 is connected to the air inlet 401. The gas guide head inlet 204 is located on the side of the gas guide head inner hole 205 away from the air inlet 401, and the gas guide head inlet 204 is funnel-shaped. The diameter of the opening on the side of the gas guide head inlet 204 away from the gas guide head inner hole 205 is larger than the diameter on the side of the gas guide head inlet 204 close to the gas guide head inner hole 205. This facilitates the introduction of inert gas, increases the inert gas pressure, and allows the inert protective gas to blow open the conical gas shield 202, introducing the gas into the interior of the annealing purge rod 4. One side of the conical gas shield 202 is in close contact with one side of the inner wall of the annealing purge rod 4, and the other side is fixed to the other side of the inner wall of the annealing purge rod 4 by a spring 203. During the inert gas injection process, the conical gas baffle 202 separates from one side of the inner wall of the annealing purge rod 4, facilitating the entry of the inert gas. After the gas is filled, the conical gas baffle 202, under the pressure of the inert gas inside the annealing purge rod 4, adheres tightly to one side of the inner wall of the annealing purge rod 4. This ensures that the protective gas inside the annealing purge rod 4 cannot flow out in reverse, and also prevents the oil fumes in the furnace from entering the inner wall of the copper tube through the gas guide head 201 during the annealing process, reducing the residual oil on the inner wall of the copper tube. Under natural conditions, one side of the conical gas baffle 202 is tightly fitted to one side of the inner wall of the annealing purge rod 4 under the action of the spring 203.
[0093] Furthermore, as a preferred embodiment, it also includes a metal positioning gasket 206 and a graphite sealing ring 207. The graphite sealing ring 207 is fitted onto one outer edge of the air guide head 201, and the metal positioning gasket 206 is fitted onto the outer edge of the graphite sealing ring 207. It also includes a screw hole 208, which penetrates the metal positioning gasket 206, the air guide head 201, and the metal sealing gasket 209. A screw is provided in the screw hole 208 to fix the metal positioning gasket 206, the air guide head 201, and the metal sealing gasket 209 to one side of the annealing purge rod 4. The inner peripheral wall of the graphite sealing ring 207 is tightly fitted against one outer edge of the air guide head 201. The metal positioning gasket 206 and the graphite sealing ring 207 have an interference fit to secure the graphite sealing ring 207 and prevent it from falling off during the purging process.
[0094] Furthermore, as a preferred embodiment, a metal sealing gasket 209 is also included. A metal sealing gasket 209 is provided between the gas guide head 201 and the annealing purge rod 4. The metal sealing gasket 209 has a through hole. The gas guide head inlet 204, the gas guide head inner hole 205, the through hole, and the air inlet 401 are coaxially arranged. In this embodiment, the gas guide head 201 and one side outer wall of the annealing purge rod 4 are sealed by the metal sealing gasket 209 to prevent gas pressure leakage. The gas guide head inner hole 205 communicates with the through hole, and the through hole communicates with the air inlet 401. The gas guide head inner hole 205 communicates with the air inlet 401 through the through hole, facilitating the blowing of inert gas into the annealing purge rod 4. The metal sealing gasket 209 is a copper sealing gasket, which is soft and facilitates a tight fit between the gas guide head 201 and the annealing purge rod 4, effectively preventing gas leakage during the purging of the inert protective gas.
[0095] Furthermore, as a preferred implementation method, see [link to previous document]. Figure 12 As shown, it also includes an annealing rack 5, on which several sets of copper tube coil 6 processing positions are provided. Each set of copper tube coil 6 processing positions has a ventilation pipe 7 on its lower side. The ventilation pipe 7 has several first ventilation branches 8, which are connected to the copper tube coil 6 through the first ventilation branches 8. The annealing purge rod 4 is located on one side of the annealing rack 5, and is connected to the ventilation pipe 7 through a second ventilation branch 9. When inert gas enters the annealing purge rod 4, it enters the ventilation pipe 7 through the second ventilation branch 9, and then enters the copper tube coil 6 through the first ventilation branch 8.
[0096] The above description is merely a preferred embodiment of the present invention and does not limit the implementation and protection scope of the present invention. Those skilled in the art should realize that any equivalent substitutions and obvious changes made based on the description and illustrations of the present invention should be included within the protection scope of the present invention.
Claims
1. A threaded copper tube oil fume adsorption device, characterized in that, The system includes an online annealing loading frame located at the feeding end of the online induction annealing process and an online annealing unloading frame located at the receiving end of the online induction annealing process. Each of the online annealing loading frame and the online annealing unloading frame has a feeding frame lifting port. The online annealing loading frame also has a ventilation connecting vertical rod. Each of the online annealing loading frame and the online annealing unloading frame has an adsorption mechanism located outside. The adsorption mechanism outside the online annealing loading frame is connected to the upper end of the ventilation connecting vertical rod, and the lower end of the ventilation connecting vertical rod is used to connect to the tail end of a copper tube. The adsorption mechanism outside the online annealing unloading frame is connected to the head end of the copper tube. Each of the aforementioned adsorption mechanisms includes: First support; Second support; A rotating connecting sleeve is disposed at the upper end of the first bracket; A first driving component is mounted on a first bracket, and the output shaft of the first driving component is movably connected to the rotary connecting sleeve. A pipe fitting, which is rotatably disposed at one end of the first bracket; A ventilation pipe, one end of which is disposed on the rotating connecting sleeve, and the other end of which is connected to the outlet gas at the upper end of the pipe joint; A disc is located at the lower end of the pipe joint, and the disc is rotatably engaged with the lifting port of the feeding frame; A connecting rod, wherein the connecting rod is a tubular structure, and one end of the connecting rod is connected to the air inlet of the pipe joint; The second driving component is mounted on the second bracket, and its output shaft is connected to the rotating connecting sleeve via a connecting mechanism.