Heat exchange crystallizer for processing oxygen-free copper rod by upward continuous casting method

Abstract

The utility model discloses a heat exchange crystallizer for processing an oxygen-free copper rod by an up-drawing continuous casting method, which is characterized in that a porous layer is arranged on the outer wall of a sleeve, a cavity is formed between a shell and the outer wall of the sleeve, and a cooling heat exchange medium (circulating cooling water) enters the cavity from a medium inlet; the heat of the copper liquid introduced into the sleeve is transferred to the cooling heat exchange medium through the sleeve, due to the arrangement of the porous layer, when the cooling heat exchange medium flows, a thin film layer is formed on the surface of the metal porous layer, then in the heat exchange process, cooling water forms a stable vaporization core in the metal porous layer, and the purpose of boiling heat transfer is achieved; compared with the prior art, the crystallizer can further improve heat exchange efficiency, reduce manufacturing cost and improve quality and efficiency for enterprises.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of oxygen-free copper rod processing, in particular to a heat exchange crystallizer for processing oxygen-free copper rod by up-drawing continuous casting method. BACKGROUND

[0002] Oxygen-free copper rod (copper products with oxygen content below 20 PPM) is widely used in the production and manufacturing of electronic, electrical and electrical devices due to its good electrical conductivity and thermal conductivity. The crystallizer, as the core device for processing oxygen-free copper rod, is a key factor in determining the solidification structure and performance of oxygen-free copper rod. The cooling heat exchange coefficient is an important process parameter of the oxygen-free copper rod crystallizer. Generally, the temperature of the copper liquid during the processing of oxygen-free copper rod is 1160℃, and a large amount of cooling water is needed for heat exchange when the copper rod is rapidly cooled to room temperature. The conventional light pipe sleeve heat exchange efficiency is low, the energy consumption is large, and the manufacturing cost of the enterprise is increased.

[0003] Therefore, it is necessary to develop a high-efficiency heat exchange crystallizer to replace the light pipe copper sleeve in the prior art while ensuring high heat exchange coefficient and improving the quality and efficiency of the enterprise. CONTENT OF THE INVENTION

[0004] (1) The technical problem to be solved: In view of the defects of low heat exchange efficiency and large energy consumption of the heat exchanger adopting light pipe sleeve in the prior art, the present application provides a heat exchange crystallizer for processing oxygen-free copper rod by up-drawing continuous casting method to solve the above problems.

[0005] (2) The technical scheme adopted by the present application is as follows:

[0006] A heat exchange crystallizer for processing oxygen-free copper rod by up-drawing continuous casting method, comprising a sleeve, a porous layer is arranged on the outer wall of the sleeve, an outer shell is arranged outside the sleeve, a cavity is formed between the outer shell and the outer wall of the sleeve, a medium inlet and a medium outlet are arranged on the outer shell, a protective sleeve is arranged at one end of the sleeve, a graphite pipe is arranged inside the sleeve near the protective sleeve, the inner diameter of the graphite pipe is equal to the inner diameter of the sleeve, the graphite pipe extends to the outside of the protective sleeve, and a traction rod is arranged inside the sleeve.

[0007] Further, the sleeve and the porous layer are made of copper.

[0008] Further, the medium outlet is located near the protective sleeve, and the medium inlet is located away from the protective sleeve.

[0009] Further, the protective sleeve comprises an outer layer and a thermal insulation layer.

[0010] Further, the sleeve is provided with an expansion hole inside near the protective sleeve, and the graphite pipe is installed at the position of the expansion hole.

[0011] (3) By the above technical scheme, the heat exchange crystallizer for processing oxygen-free copper pole by up-drawing continuous casting method has the advantages that the porous layer is arranged on the outer wall of the sleeve pipe, the cavity is formed between the outer shell and the outer wall of the sleeve pipe, the cooling heat exchange medium (circulating cooling water) enters the cavity from the medium inlet, the heat of the copper liquid introduced into the sleeve pipe is transferred to the cooling heat exchange medium through the sleeve pipe itself, the cooling heat exchange medium forms a film layer on the surface of the metal porous layer when flowing due to the arrangement of the porous layer, then, in the heat exchange process, the cooling water forms stable vaporization cores in the metal porous layer to realize the purpose of boiling heat transfer, the sleeve pipe is provided with the protective sleeve at one end, the graphite pipe is arranged in the sleeve pipe at the end close to the protective sleeve, the inner diameter of the graphite pipe is equal to the inner diameter of the sleeve pipe, the graphite pipe extends to the outside of the protective sleeve, the graphite pipe reduces the influence of friction force on the surface of the copper pole, the traction rod is arranged in the sleeve pipe and is used for being connected with the existing traction equipment to draw the copper liquid when the copper pole is manufactured, and the crystallizer of the present application can further improve the heat exchange efficiency and reduce the manufacturing cost, thereby improving the quality and increasing the efficiency of enterprises. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 is the overall structure schematic view of the present application;

[0013] Figure 2 is the schematic view of the porous layer of the present application;

[0014] Figure 3 belongs to Figure 2 the physical map of the porous layer. DETAILED DESCRIPTION

[0015] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application will be further described in detail below in combination with the drawings and examples.

[0016] As Figures 1-3 shown. A heat exchange crystallizer for processing oxygen-free copper pole by up-drawing continuous casting method, comprising a sleeve pipe 3, a porous layer 2 is arranged on the outer wall of the sleeve pipe 3, an outer shell 4 is arranged outside the sleeve pipe 3, a cavity is formed between the outer shell 4 and the outer wall of the sleeve pipe 3, a medium inlet 1 and a medium outlet 5 are arranged on the outer shell 4, a protective sleeve 6 is arranged at one end of the sleeve pipe 3, a graphite pipe 7 is arranged in the sleeve pipe 3 at the end close to the protective sleeve 6, the inner diameter of the graphite pipe 7 is equal to the inner diameter of the sleeve pipe 3, the graphite pipe 7 extends to the outside of the protective sleeve 6, and a traction rod 8 is arranged in the sleeve pipe 3.

[0017] The sleeve 3 and the porous layer 2 are both made of copper. The medium outlet 5 is located close to the protective sleeve 6, and the medium inlet 1 is located away from the protective sleeve 6. The protective sleeve 6 comprises an outer layer 10 (made of silicon carbide / graphite) and a heat insulation layer 9 (made of asbestos / glass fiber). The sleeve 3 is internally provided with a counterbore 11 at one end close to the protective sleeve 6, and the graphite pipe 7 is installed at the position of the counterbore 11. The thickness of the porous layer 2 is 0.3-0.5 mm, and the porosity is about 50%-60%.

[0018] In use, the holes on the surface of the porous layer 2 are through the body of the porous layer 2, and the outer wall of the sleeve 3 is capable of being in communication with the cavity between the shell 4 and the outer wall of the sleeve 3. The cooling and heat exchange medium in the shell 4 forms a vaporization core in the form of a film on the surface of the porous layer 2 in the process of heat exchange, and realizes high-efficiency heat exchange of the cooling and heat exchange medium under the action of boiling heat transfer at low supercooling degree. The cooling and heat exchange medium is cooling water, and the water pressure of the cooling water is 0.1 MPa-0.3 MPa. The circulating direction of the cooling water is opposite to the traction direction of the traction rod 8. Under the countercurrent heat exchange, higher-efficiency heat exchange can be realized. The protective sleeve 6 at the end of the crystallizer comprises the outer layer 10 and the heat insulation layer 9, so that the crystallizer immersed in the copper liquid cannot penetrate into the copper liquid. In addition, the part directly contacted with the copper liquid is selected to be the graphite sleeve 3. The graphite sleeve 3 is connected with the sleeve 3 made of pure copper. The graphite sleeve 3 is a consumable and needs to be replaced regularly. The traction rod 8 plays a role in guiding the copper liquid to move along the direction of the graphite pipe 7. The traction speed of the copper rod is generally 1.5 mm / min, and the pitch is 3 pitches.

[0019] Example 1

[0020] φ8 mm oxygen-free copper rods are processed by using the up-drawing continuous casting method in a three-body furnace composed of a melting furnace, a transition furnace and a holding furnace. Dry electrolytic copper sheets and charcoal are added to the melting furnace, the temperature of the melting furnace is adjusted to 1160℃, and the liquid level height of the copper liquid is kept at 300℃. The melted copper liquid is self-flowed to the transition bin for static decontamination. The surface of the copper liquid is paved with 150 mm of charcoal and graphite scales for further reduction and purification of the copper liquid. The graphite crystallizer is inserted into the copper liquid, the lead-in rod is connected, the inlet water temperature is 15℃, the outlet water temperature is 25℃, the water pressure of the cooling water is 0.2 MPa, the traction speed of the copper rod is 1.5 mm / min, and the pitch is 3 pitches. After the copper rod is drawn out, the lead-in rod is disconnected in sections, and enters the take-up system through the guide wheel frame, the intermediate bracket and the limiting device. The produced copper rod is subjected to sampling inspection, and the results show that the oxygen content of the oxygen-free copper rod is 8 ppm, the resistivity is 0.01705 Ω·mm2 / m, and the tensile strength is 390 MPa.

[0021] Example 2

[0022] φ8mm processing oxygen-free copper rod is carried out in a three-body furnace composed of a melting furnace, a transition furnace and a holding furnace by using the up-drawing continuous casting method. Dry electrolytic copper sheet and charcoal are added into the melting furnace, the temperature of the melting furnace is adjusted to 1160 DEG C, and the liquid level height of the copper liquid is kept at 300 DEG C. The melted copper liquid flows into the transition furnace for static impurity removal, 150mm charcoal and graphite scales are laid on the surface of the copper liquid for further reduction and purification of the copper liquid. The porous layer graphite crystallizer is inserted into the copper liquid, the drawing rod is prepared by connecting the drawing rod, the inlet water temperature is 15 DEG C, the outlet water temperature is 35 DEG C, and the cooling water pressure is 0.2 MPa, so that the heat exchange efficiency is higher. The drawing speed of the copper rod is 1.5mm / min, and the pitch is 3 pitches. After the copper rod is drawn out, the drawing rod is disassembled in sections, and enters the take-up system through the guide wheel frame, the intermediate bracket and the limiting device, the copper rod produced is sampled and tested, and the results show that the oxygen content of the oxygen-free copper rod is 5ppm, the resistivity is 0.01705 omega*mm2 / m, and the tensile strength is 390MPa.

[0023] The comparison of the two embodiments is that, at the same inlet temperature, the heat exchange efficiency of the porous layer structure crystallizer is higher than that of the conventional graphite crystallizer, the outlet water temperature is higher, and the heat exchange is more efficient.

[0024] The above is only a preferred embodiment of the present application.

Claims

1. A heat exchange mold for processing oxygen-free copper rods by an up-drawing continuous casting method, characterized by, The application relates to a porous layer (2) provided on the outer wall of a sleeve (3), an outer shell (4) provided outside the sleeve (3), a cavity formed between the outer shell (4) and the outer wall of the sleeve (3), a medium inlet (1) and a medium outlet (5) provided on the outer shell (4), a protective sleeve (6) provided at one end of the sleeve (3), a graphite tube (7) provided inside the sleeve (3) near the protective sleeve (6), the inner diameter of the graphite tube (7) being equal to the inner diameter of the sleeve (3), the graphite tube (7) extending outside the protective sleeve (6), and a traction rod (8) provided inside the sleeve (3).

2. A heat exchange mould for producing oxygen free copper rods by upward continuous casting according to claim 1, characterized in that, The sleeve (3) and the porous layer (2) are made of copper.

3. A heat exchanger mould for producing oxygen free copper rods by upward continuous casting according to claim 1, characterized in that The medium outlet (5) is located near the protective sleeve (6), and the medium inlet (1) is located away from the protective sleeve (6).

4. A heat exchanger mould for producing oxygen free copper rods by upward continuous casting according to claim 1, characterized in that The protective sleeve (6) comprises an outer layer (10) and a heat insulation layer (9).

5. A heat exchanger mould for producing oxygen free copper rods by upward continuous casting according to claim 1, characterized in that The sleeve (3) is provided with an expansion hole (11) inside the end near the protective sleeve (6), and the graphite tube (7) is installed at the position of the expansion hole (11).

6. A heat exchanger mould for producing oxygen free copper rods by upward continuous casting according to claim 1, characterized in that The thickness of the porous layer (2) is 0.3-0.5 mm, and the porosity is about 50%-60%.

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