Cooling device special for superfine circular welding strip

Abstract

The utility model provides a cooling device special for a superfine circular welding strip. The cooling device comprises an air inlet flange, an outer pipe, an inner pipe and a sealing plate. The inner pipe is arranged in the outer pipe, and a clearance space is formed between the outer pipe and the inner pipe; the upper and lower ends of the outer pipe and the inner pipe are sealed through sealing plates; one end of the outer pipe is provided with an air inlet flange used for being connected with an external fan, and the air inlet flange is communicated with a clearance space between the outer pipe and the inner pipe; a plurality of groups of tuyere assemblies are arranged on the surface of the inner pipe wall of the inner pipe, and each tuyere assembly comprises a plurality of tuyeres which are symmetrically arranged in a surrounding manner; the air nozzle can guide airflow between the outer pipe and the inner pipe to be blown into the inner pipe. The tuyeres are inclined downwards and point to the center of the inner pipe; the welding strip can penetrate through the center of the air nozzle assembly. According to the cooling device, the welding strip can be efficiently cooled under the condition that the running speed reaches 500m / min, the welding strip cannot violently shake, and the stable quality of the superfine photovoltaic welding strip after tin plating is ensured.

Description

Technical Field

[0001] The utility model relates to a special cooling device for an extremely fine circular welding belt, belonging to the technical field of photovoltaic welding belt manufacturing. Background Art

[0002] With the rise of 0BB cells, the dedicated photovoltaic ribbons have been continuously developed towards miniaturization. MBB ribbons have developed from the early Φ0.4mm to the current Φ0.25mm~Φ0.3mm, and may develop to less than Φ0.2mm in the future. As the wire diameter becomes thinner and thinner, the manufacturing process of MBB ribbons is also constantly improving. Because the thinner the wire diameter, the more stringent the requirements for the tension control, speed stability, wire arrangement accuracy, annealing process, and tin coating process of the manufacturing equipment, and the thinner the wire diameter, the lower the output. For example, under the same tin coating speed, the production capacity of Φ0.2mm ribbon is only 44% of that of Φ0.3mm. This means that the ultra-fine MBB ribbon must significantly increase the tin coating speed to keep the manufacturing cost flat, which in turn raises higher requirements for production equipment and manufacturing processes.

[0003] At present, the cooling method of photovoltaic welding strips after tinning is basically fan or oblique air outlet. This air supply method has a large air volume and has a relatively good effect on cooling welding strips with thicker wire diameters. However, when the wire diameter of the welding strip is less than Φ0.25mm, there will be disadvantages: 1. This method has low airflow utilization rate. Taking the fan as an example, its air supply area is more than 200mm², but less than 1% can act on the welding strip. A large amount of wind force is dissipated. When the wire diameter becomes smaller, this situation becomes more obvious; 2. The air supply direction is single. The fan is single-sided air supply, and the oblique air outlet is double-sided air supply. This air supply method makes the welding strip unevenly stressed and very easy to swing. When the wire diameter is large, the swing of the welding strip can be reduced by increasing the tension, but the extremely fine welding strip must be operated under extremely small tension to ensure physical properties. At this time, the above two air supply methods are no longer applicable, which will cause the welding strip to shake violently, seriously affecting the quality stability of the welding strip. Summary of the invention

[0004] In view of the shortcomings in the prior art, an embodiment of the utility model provides a special cooling device for an extremely fine circular welding ribbon, which can realize efficient cooling of the welding ribbon at an operating speed of 500m / min without causing violent shaking of the welding ribbon, thereby ensuring the stable quality of the extremely fine photovoltaic welding ribbon after tinning.

[0005] In order to achieve the above technical objectives, the technical solution adopted by the embodiment of the utility model is:

[0006] A special cooling device for an extremely fine circular welding strip, comprising an air intake flange, an outer tube, an inner tube and a sealing plate; the inner tube is arranged inside the outer tube, and a gap space is formed between the outer tube and the inner tube; the upper and lower ends of the outer tube and the inner tube are sealed by a sealing plate; an air intake flange for connecting an external fan is arranged at one end of the outer tube, and the air intake flange is connected to the gap space between the outer tube and the inner tube; a plurality of groups of wind nozzle assemblies are arranged on the inner tube wall surface of the inner tube, and the wind nozzle assembly includes a plurality of wind nozzles arranged symmetrically around; the wind nozzle can guide the airflow between the outer tube and the inner tube to blow into the inner tube; the wind nozzles are arranged to tilt downward and both point to the center of the inner tube; the center of the wind nozzle assembly can allow the welding strip to pass through.

[0007] Furthermore, the angle of the air nozzle is inclined downward by 30-60 degrees.

[0008] Furthermore, the air nozzle is a circular tube type.

[0009] Furthermore, the nozzle assemblies are arranged on the inner tube at intervals, and the interval distance between each group of nozzle assemblies is equal.

[0010] The beneficial effects brought by the technical solution provided by the embodiment of the utility model are:

[0011] The utility model has a very high airflow utilization rate, and only 1 / 4 of the air volume of the conventional cooling method is needed to achieve the purpose of cooling. According to the test, 8 sets of fine air nozzles can solidify a 0.2mm solder strip within 1.5 meters at a running speed of 500m / min. The solder strip has almost no shaking under a pulling tension of 1N, ensuring good tinning quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the structure in an embodiment of the utility model.

[0013] Figure 2 It is a schematic diagram of the structure in an embodiment of the utility model.

[0014] Figure 3 It is a top view of the inner tube and the air nozzle assembly in the embodiment of the utility model.

[0015] Figure 4 It is a partial schematic diagram of the inner tube in the embodiment of the utility model. DETAILED DESCRIPTION

[0016] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0017] like Figure 1 , Figure 2 and Figure 4 As shown, the embodiment of the utility model provides a special cooling device for an extremely fine circular welding strip, comprising an air inlet flange 1, an outer tube 2, an inner tube 3 and a sealing plate 4; the inner tube 3 is arranged in the outer tube 2, and a gap space is formed between the outer tube 2 and the inner tube 3; the upper and lower ends of the outer tube 2 and the inner tube 3 are sealed by the sealing plate 4; an air inlet flange 1 for connecting an external fan is arranged at one end of the outer tube 2, and the inner end of the air inlet flange 1 is connected to the gap space between the outer tube 2 and the inner tube 3; as shown Figure 3 As shown, the inner tube wall surface of the inner tube 3 is provided with several groups of nozzle assemblies, and the nozzle assemblies include several nozzles 501 that are symmetrically arranged around; the nozzles 501 can guide the airflow between the outer tube 2 and the inner tube 3 to blow into the inner tube 3; the nozzles 501 are arranged to be tilted downward and all point to the center of the inner tube 3; the center of the nozzle assembly can allow the welding strip to pass through.

[0018] In a specific embodiment, in order to allow the blown airflow to escape downward quickly and thus help rapid cooling, the angle of the air nozzle 501 is tilted downward by 30-60 degrees.

[0019] In a specific embodiment, in order to increase the air output, the air nozzle 501 is a circular tube type.

[0020] In a specific embodiment, the nozzle assemblies are arranged on the inner tube 3 at intervals, and the intervals between each group of nozzle assemblies are equal. The nozzle assemblies arranged at equal intervals can eliminate the resonance effect, so that the tin strip will not have obvious amplitude.

[0021] The utility model is divided into two parts, an outer tube 2 and an inner tube 3. The outer tube 2 is connected to the external fan through the air inlet flange 1. The surface of the inner tube 3 is distributed with symmetrical thin air nozzles 501. The angle of the air nozzles 501 is 30°~60° downward and all point to the center of the inner tube 3. When the external fan starts to supply air, the airflow first fills the gap between the inner and outer tubes. Since the upper and lower ports of the inner and outer tubes are airtight with the sealing plate 4, the airflow can only enter the inner tube 3 through the air nozzles 501 on the wall of the inner tube 3. The solder strip passes through the center of the inner tube 3 and will receive relatively uniform wind force in all directions. And because there are multiple groups of air nozzle components, the resonance effect is eliminated, so that the tin strip will not have obvious amplitude.

[0022] Finally, it should be noted that the above specific implementation methods are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to examples, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A cooling device for ultra-thin round welding strips, characterized in that: The invention comprises an air intake flange (1), an outer tube (2), an inner tube (3) and a sealing plate (4); the inner tube (3) is arranged inside the outer tube (2), and a gap space is formed between the outer tube (2) and the inner tube (3); the upper and lower ends of the outer tube (2) and the inner tube (3) are sealed by a sealing plate (4); an air intake flange (1) for connecting to an external fan is arranged at one end of the outer tube (2), and the air intake flange (1) is connected to the gap space between the outer tube (2) and the inner tube (3); a plurality of groups of air nozzle assemblies are arranged on the inner tube wall surface of the inner tube (3), and the air nozzle assemblies include a plurality of air nozzles (501) arranged symmetrically around; the air nozzles (501) can guide the airflow between the outer tube (2) and the inner tube (3) to be blown into the inner tube (3); the air nozzles (501) are arranged to be tilted downward and all point to the center of the inner tube (3); the center of the air nozzle assembly can allow a welding strip to pass through.

2. The cooling device for ultra-thin round welding strip according to claim 1, characterized in that: The wind nozzle (501) is inclined downward at an angle of 30-60°.

3. The cooling device for ultra-thin round welding strip according to claim 1, characterized in that: The air nozzle (501) is of a circular tube type.

4. The cooling device for ultra-thin round welding strip according to claim 1, characterized in that: The nozzle assemblies are arranged on the inner tube (3) at intervals, and the intervals between each group of nozzle assemblies are equal.

Images