Air knife for photovoltaic welding strip

Abstract

The invention discloses an air knife for a photovoltaic welding strip, and relates to the technical field of air knives, the air knife comprises an upper shell and a lower shell, the concentric part of the upper shell and the lower shell is provided with a mold hole for the welding strip to pass through, the upper shell and the lower shell are connected to form a cavity for gas circulation, and air blowing ports are formed in the mold holes of the upper shell and the lower shell. The cavity comprises a horizontal section, a vertical section and an inclined section, at least two air inlets communicated with the horizontal section are formed in the side wall of the lower shell at equal intervals, and a fixed first flow stabilizing plate and a movable second flow stabilizing plate are sequentially arranged in the vertical section from bottom to top; through cooperation of the stage column, the elastic piece and other structures, when the flowing speed of entering air flow is increased, the flowing speed can be reduced by controlling the gap between the ventilation opening and the stage column to be increased, so that the flowing speed of the entering air flow is balanced, the flowing speed of the air flow is stable, and the qualified rate of products is guaranteed; and the service life of the elastic piece is longer than that of the silica gel layer, so that the maintenance frequency is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of air knives, and specifically relates to an air knife for photovoltaic solder tapes. Background Art

[0002] The air knife for photovoltaic solder tapes is used for the photovoltaic solder tapes, that is, the bus bars on the photovoltaic panel, and the flat copper strip is coated with a solder layer; during the preparation of the photovoltaic solder tape, it is necessary to immerse the high-temperature solder tape in water for annealing. After the photovoltaic solder tape leaves the water, there will be a certain amount of water on the surface, and the air knife is used to blow the water off the solder tape to ensure the dryness of the solder tape.

[0003] The existing Chinese patent CN 114086099 B is a circular air knife for high concentricity. This patent uses a silicone layer to open under pressure and close when the pressure is insufficient. However, when the air flow is unstable, especially when the air flow suddenly becomes larger, the silicone layer is still in the open state, so that the air flow velocity blowing towards the solder tape at the air outlet becomes larger, which will make the coated solder layer loose and affect the qualified rate of the product. Summary of the Invention

[0004] The purpose of the present invention is to provide an air knife for photovoltaic solder tapes to solve the problems raised in the above background art.

[0005] To solve the above technical problems, the present invention provides the following technical solution: an air knife for photovoltaic solder tapes, including an upper housing and a lower housing. A die hole for passing through the solder tape is provided at the concentric center of the upper housing and the lower housing. After the upper housing and the lower housing are connected, a cavity for gas flow is formed. The die holes of the upper housing and the lower housing form an air outlet. The cavity includes a horizontal section, a vertical section, and an inclined section. At least two air inlets communicating with the horizontal section are equally divided and provided on the side wall of the lower housing. A fixed first flow stabilizer plate and a movable second flow stabilizer plate are sequentially arranged from bottom to top in the vertical section. A number of flow stabilizing holes are provided on the first flow stabilizer plate, and a number of ventilation holes are provided on the second flow stabilizer plate. The flow stabilizing holes of the first flow stabilizer plate and the ventilation holes of the second flow stabilizer plate are arranged in an alternating manner. A stage column perpendicularly fixed to the first flow stabilizer plate through the ventilation holes is provided on the second flow stabilizer plate. The stage column is a combination of multiple concentric cylinders, and the diameters of the concentric cylinders decrease equally from top to bottom. The outer diameter of the top cylinder is the same as the inner diameter of the ventilation hole. An elastic member for jacking up the second flow stabilizer plate is provided between the first flow stabilizer plate and the second flow stabilizer plate.

[0006] As a preferred scheme of the air knife for photovoltaic solder tapes of the present invention, wherein: the upper housing and the lower housing are threadedly connected. The threaded section of the lower housing is larger than the threaded section of the upper housing. A fastening groove is provided in the middle of the threaded section of the upper housing. The height of the threaded section of the lower housing minus the height of the threaded section of the upper housing is equal to the height of the fastening groove. A number of fastening bolts that are threadedly connected to the side wall of the lower housing and fastened to the fastening groove are provided.

[0007] As a preferred embodiment of the air knife for photovoltaic solder ribbons of the present invention, several bumps are symmetrically arranged at the top end of the upper housing.

[0008] As a preferred embodiment of the air knife for photovoltaic solder ribbons of the present invention, a flow splitter is vertically fixed to the bottom end of the upper housing, a limiting block at the same height as the bottom end of the flow splitter is fixed to the side wall of the upper housing, and the bottom ends of both the flow splitter and the limiting block are in circumferential contact with the second flow stabilizer plate without obstructing the stage column.

[0009] As a preferred embodiment of the air knife for photovoltaic solder ribbons of the present invention, the flow splitter has an arc-shaped triangular structure, and its tip is located in the middle of the air inlet.

[0010] As a preferred embodiment of the air knife for photovoltaic solder ribbons of the present invention, a limiting hole is opened at the top of the ventilation opening, a limiting post adapted to the limiting hole is provided at the top end of the stage column, and the bottom of the stage column is threadedly connected to the first flow stabilizer plate.

[0011] As a preferred embodiment of the air knife for photovoltaic solder ribbons of the present invention, the elastic member is arranged on the side wall of the upper housing or the side wall of the lower housing.

[0012] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: Through the cooperation of structures such as the stage column and the elastic member, when the flow rate of the incoming air flow becomes larger, the gap between the ventilation opening and the stage column can be controlled to become larger, so as to reduce the flow rate, thereby balancing the flow rate of the incoming gas, making the air flow rate stable, ensuring the qualified rate of products, and the service life of the elastic member is longer than that of the silicone layer, reducing the number of maintenance times. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The drawings are used to provide a further understanding of the present invention, and constitute a part of the specification. They are used together with the embodiments of the present invention to explain the present invention, and do not constitute a limitation to the present invention. In the drawings: Figure 1 is the front view of an air knife for photovoltaic solder ribbons of the present invention; Figure 2 is a partial view of an air knife for photovoltaic solder ribbons of the present invention; Figure 3 is a schematic installation structure diagram of the stage column of an air knife for photovoltaic solder ribbons of the present invention; Figure 4 is the top view of an air knife for photovoltaic solder ribbons of the present invention.

[0014] Reference signs in the drawings: 1. Upper shell; 2. Lower shell; 3. Air outlet; 4. Horizontal section; 5. Vertical section; 6. Oblique section; 7. Air inlet; 8. Fastening bolt; 9. Fastening groove; 10. Bump; 11. First flow stabilizer plate; 12. Second flow stabilizer plate; 13. Ventilation opening; 14. Stage column; 15. Elastic member; 16. Limit block; 17. Flow splitter plate. Detailed implementation manner

[0015] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0016] Please refer to Figures 1-4 , the present invention provides a technical solution: an air knife for photovoltaic welding tapes, including an upper shell 1 and a lower shell 2. A die hole for passing through the welding tape is provided at the concentric center of the upper shell 1 and the lower shell 2. After the upper shell 1 and the lower shell 2 are connected, a cavity for gas flow is formed. An air outlet 3 is formed at the die hole of the upper shell 1 and the lower shell 2. The cavity includes a horizontal section 4, a vertical section 5, and an oblique section 6. At least two air inlets 7 communicating with the horizontal section 4 are equally divided and provided on the side wall of the lower shell 2. A fixed first flow stabilizer plate 11 and a movable second flow stabilizer plate 12 are sequentially arranged from bottom to top in the vertical section 5. A plurality of flow stabilizing holes are provided on the first flow stabilizer plate 11, and a plurality of ventilation openings 13 are provided on the second flow stabilizer plate 12. The flow stabilizing holes on the first flow stabilizer plate 11 and the ventilation openings 13 on the second flow stabilizer plate 12 are arranged in an alternating manner. The air flow is sorted twice through the flow stabilizing holes and the ventilation openings 13 to make the air flow more stable. A stage column 14 vertically fixed to the first flow stabilizer plate 11 through the ventilation opening 13 is provided on the second flow stabilizer plate 12. The stage column 14 is a combination of multiple concentric cylinders, and the diameters of the concentric cylinders decrease equally from top to bottom. The outer diameter of the top cylinder is the same as the inner diameter of the ventilation opening 13. When the gas pressure is insufficient, the ventilation opening 13 is closed. When the gas pressure reaches, the ventilation opening 13 is opened. When the gas pressure is continuously strengthened, the flow velocity of the air flow entering the ventilation opening 13 decreases. An elastic member 15 for jacking up the second flow stabilizer plate 12 is arranged between the first flow stabilizer plate 11 and the second flow stabilizer plate 12. The elastic member 15 is preferably a spring made of stainless steel.

[0017] In use, the air flow enters from the air inlet 7 and then into the horizontal section 4. When the air pressure is sufficient, it pushes the second flow stabilizer plate 12 in the vertical section 5 downward, squeezing the elastic member 15, so that the top cylinder of the stage column 14 completely exposes from the ventilation opening 13, thus opening the ventilation opening 13. The air flow enters from the ventilation opening 13, then enters the inclined section 6 through the flow stabilizing holes, and finally blows out from the air outlet 3. When the air flow suddenly increases, the air pressure in the horizontal section 4 will continuously increase, thus pushing the second flow stabilizer plate 12 to move downward further, making the lower cylinder of the stage column 14 expose. Since the diameter of the lower cylinder is smaller than that of the upper cylinder, the gap between the ventilation opening 13 and the cylinder becomes larger, so the air flow velocity through the ventilation opening 13 decreases, so as to offset the influence brought by the sudden increase of the air flow, stabilize the air flow velocity, and make the air flow blown out from the air outlet 3 more stable.

[0018] Please refer to Figure 1 , the upper shell 1 and the lower shell 2 are threadedly connected. The threaded section of the lower shell 2 is larger than that of the upper shell 1. The height position of the upper shell 1 in the lower shell 2 can be changed. A fastening groove 9 is opened in the middle of the threaded section of the upper shell 1. The height of the threaded section of the lower shell 2 minus the height of the threaded section of the upper shell 1 is equal to the height of the fastening groove 9. A number of fastening bolts 8 that are fastened to the fastening groove 9 are threadedly connected to the side wall of the lower shell 2.

[0019] In use, first loosen the fastening bolts 8, then rotate the upper shell 1 so that the upper shell 1 moves up and down in the lower shell 2. When the upper shell 1 reaches the appropriate position, tighten the fastening bolts 8. The fastening bolts 8 enter the fastening groove 9, which can prevent the fastening bolts 8 from directly contacting the side wall of the upper shell 1, causing deformation of the upper shell 1 and thus destroying the sealing effect. Thus, the gap of the air outlet 3 is changed, and the air flow velocity on the air outlet 3 is changed. It is possible to change the flow velocity of the air outlet 3 without changing the incoming air flow, so as to achieve the purpose of adjusting the flow velocity of the air outlet 3 to meet the requirements of different solder tapes for different air flow velocities.

[0020] Please refer to Figure 1 and Figure 4 , a number of convex points 10 are symmetrically arranged at the top end of the upper shell 1. Through the use of the convex points 10, it is convenient to rotate the upper shell 1.

[0021] Please refer to Figure 1 and Figure 2 , a flow dividing plate 17 is vertically fixed at the bottom end of the upper shell 1. A limiting block 16 at the same height as the bottom end of the flow dividing plate 17 is fixed on the side wall of the upper shell 1. Both the flow dividing plate 17 and the bottom end of the limiting block 16 are in circumferential contact with the second flow stabilizer plate 12 and do not obstruct the stage column 14.

[0022] When the upper housing 1 moves downward, it simultaneously drives the flow dividing plate 17 and the limiting block 16 to move downward. The downward movement of the flow dividing plate 17 and the limiting block 16 drives the second flow stabilizing plate 12 to also move downward, which can open the ventilation opening 13 and change the flow rate entering the ventilation opening 13 under the condition of unchanged air flow to meet the needs of different users.

[0023] Please refer to Figure 2 , the flow dividing plate 17 has an arc-shaped triangular structure, and its tip is located in the middle of the air inlet 7, gently guiding the air flow entering the air inlet 7 to both sides.

[0024] Among them, a limiting hole is opened at the top of the ventilation opening 13, a limiting post adapted to the limiting hole is provided at the top end of the stage column 14, and the bottom of the stage column 14 is threadedly connected to the first flow stabilizing plate 11. Through the cooperation of the limiting post and the limiting hole, the height of the second flow stabilizing plate 12 can be limited by the stage column 14. Through the threaded connection, the removal and installation of the stage column 14 can be facilitated, which is convenient for maintenance.

[0025] Please refer to Figure 2 and Figure 4 , the elastic member 15 is arranged on the side wall of the upper housing 1 or the side wall of the lower housing 2, which can prevent the elastic member 15 from affecting the entry of the air flow into the flow stabilizing holes and the ventilation opening 13.

[0026] Importantly, it should be noted that the construction and arrangement of the present application shown in multiple different exemplary embodiments are only illustrative. Although only a few embodiments are described in detail in this disclosure, those who refer to this disclosure should easily understand that many modifications are possible on the premise of substantially not deviating from the novel teachings and advantages of the subject matter described in this application (for example, the dimensions, scales, structures, shapes and proportions of various components, and parameter values (such as temperature, pressure, etc.), installation arrangements, use of materials, color, orientation changes, etc.). For example, an element shown as integrally formed can be composed of multiple parts or elements, the position of the element can be inverted or otherwise changed, and the nature, number or position of discrete elements can be changed or altered. Therefore, all such modifications are intended to be included within the scope of the present invention. The order or sequence of any process or method steps can be changed or reordered according to alternative embodiments. In the claims, any "means-plus-function" clause is intended to cover the structure that performs the recited function herein, and not only structural equivalents but also equivalent structures. Other substitutions, modifications, changes and omissions can be made in the design, operating conditions and arrangement of the exemplary embodiments without departing from the scope of the present invention. Therefore, the present invention is not limited to a specific embodiment, but extends to various modifications that still fall within the scope of the appended claims.

[0027] In addition, to provide a concise description of the exemplary embodiments, not all features of the actual embodiments may be described (i.e., those features that are not relevant to the currently contemplated best mode of carrying out the invention or those features that are not relevant to the implementation of the invention).

[0028] It should be understood that, in the development of any actual implementation, as in any engineering or design project, numerous specific implementation decisions may be made. Such development efforts may be complex and time-consuming, but for those of ordinary skill in the art who benefit from this disclosure, without undue experimentation, such development efforts will be a routine task of design, fabrication, and production.

[0029] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered by the scope of the claims of the present invention.

Claims

1. An air knife for a photovoltaic solder ribbon, comprising an upper housing (1) and a lower housing (2). A die hole for passing through the solder ribbon is provided at the concentric center of the upper housing (1) and the lower housing (2). After the upper housing (1) and the lower housing (2) are connected, a cavity for gas circulation is formed. A blowing port (3) is formed at the die hole of the upper housing (1) and the lower housing (2). The cavity includes a horizontal section (4), a vertical section (5), and an inclined section (6). At least two air inlets (7) communicated with the horizontal section (4) are equally divided and provided on the side wall of the lower housing (2), and it is characterized in that, A fixed first flow stabilizer plate (11) and a movable second flow stabilizer plate (12) are successively arranged from bottom to top in the vertical section (5). A number of flow stabilizer holes are provided on the first flow stabilizer plate (11), and a number of ventilation openings (13) are provided on the second flow stabilizer plate (12). The flow stabilizer holes of the first flow stabilizer plate (11) and the ventilation openings (13) of the second flow stabilizer plate (12) are arranged in a staggered manner. A stage column (14) vertically fixed to the first flow stabilizer plate (11) through the ventilation openings (13) is provided on the second flow stabilizer plate (12). The stage column (14) is a combination of multiple concentric cylinders, and the diameters of the concentric cylinders decrease equally from top to bottom. The outer diameter of the topmost cylinder is the same as the inner diameter of the ventilation opening (13). An elastic member (15) for jacking up the second flow stabilizer plate (12) is arranged between the first flow stabilizer plate (11) and the second flow stabilizer plate (12).

2. The air knife for a photovoltaic soldering ribbon according to claim 1, wherein: The upper housing (1) and the lower housing (2) are connected by threads. The threaded section of the lower housing (2) is larger than that of the upper housing (1). A fastening groove (9) is provided in the middle of the threaded section of the upper housing (1). The height of the threaded section of the lower housing (2) minus the height of the threaded section of the upper housing (1) is equal to the height of the fastening groove (9). A number of fastening bolts (8) fastened to the fastening groove (9) are threadedly connected to the side wall of the lower housing (2).

3. The air knife for a photovoltaic solder ribbon according to claim 2, characterized in that: A number of bumps (10) are symmetrically arranged at the top end of the upper housing (1).

4. The air knife for photovoltaic soldering ribbon according to claim 2, wherein: A flow dividing plate (17) is vertically fixed to the bottom end of the upper housing (1). A limiting block (16) at the same height as the bottom end of the flow dividing plate (17) is fixed to the side wall of the upper housing (1). The bottom ends of the flow dividing plate (17) and the limiting block (16) are in circumferential contact with the second flow stabilizer plate (12) and do not obstruct the stage column (14).

5. The air knife for photovoltaic solder tape according to claim 4, characterized in that: The flow dividing plate (17) has an arc-shaped triangular structure, and its tip is located in the middle of the air inlet (7).

6. The air knife for a photovoltaic solder ribbon according to claim 1, wherein: A limiting hole is provided at the top of the ventilation opening (13). A limiting column adapted to the limiting hole is provided at the top end of the stage column (14), and the bottom of the stage column (14) is threadedly connected to the first flow stabilizer plate (11).

7. The air knife for photovoltaic solder tape according to claim 1, wherein: The elastic member (15) is arranged on the side wall of the upper housing (1) or the side wall of the lower housing (2).

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