String photovoltaic grid-connected inverter chassis manufacturing process

Abstract

The invention discloses a manufacturing process of a series photovoltaic grid-connected inverter chassis, comprising the following steps: preparing a base, a box body, an upper cover, and a maintenance box; connecting corresponding joints between a lower side plate, a left side plate, a right side plate, a front side plate, and a rear side plate of the box body by welding, so that the lower side plate, the left side plate, the right side plate, the front side plate, and the rear side plate together enclose a cavity; spraying and protecting the inner wall of the cavity and the lower inner wall of the upper cover; spraying and protecting the inner wall of the maintenance cavity of the maintenance box, and spraying and protecting the outer wall of the maintenance cover of the maintenance box; installing the box body above the base, installing the main body of the maintenance box on the outer wall of the left side plate of the box body, and installing the upper cover on the upper opening of the box body; thereby, the surface of each component can be protected, the phenomenon that the surface of each component is easily damaged is avoided, the overall appearance is more beautiful, and simple assembly between the components is realized, the manufacturing process is simple, and the assembly is convenient.

Description

Technical Field

[0001] The present invention relates to the field of inverter chassis technology, and in particular to a manufacturing process for a series photovoltaic grid-connected inverter chassis. Background Art

[0002] An inverter is a converter that converts DC power into constant frequency and voltage or frequency and voltage-regulated AC power. The inverter is usually used to fix the inverter and protect the inverter and its components. The inverter usually assembles the components on a chassis, and then integrates the components through the chassis for use. The existing chassis for the inverter usually includes a base, a box connected to the top of the base, and an upper cover on the box. The box includes a lower side panel, a left side panel, a right side panel, a front side panel, and a rear side panel. The corresponding joints between the lower side panel, the left side panel, the right side panel, the front side panel, and the rear side panel are connected by welding, so as to realize the assembly between the side panels. However, after welding, there is a lack of protection treatment for the surface of the components, which leads to the phenomenon that the surfaces of the components are easily damaged during use, and the welding surface is rough and aesthetically pleasing. In addition, in order to ensure airtightness, a rubber strip is usually added between the box and the upper cover, but after welding, there is a lack of grinding treatment on the surface of the components, which easily causes welding slag to press on the rubber strip and affect the airtightness. Secondly, when used outdoors in thunderstorms, it may be affected by lightning and cannot guarantee normal operation. It does not have lightning protection performance, and users are required to carry maintenance tools for later maintenance. It does not have a built-in maintenance design, which causes inconvenience. In addition, the base and the box are connected by aligning the screw holes and then locking the screws. In this way, the alignment of the screw holes is difficult to be accurate and prone to deviation during assembly, resulting in difficulty in locking the screws, or even the phenomenon of not being able to lock them in, affecting assembly efficiency. In addition, the base is usually in direct contact with the external structure, so the chassis is easily affected by the external environment. For example, in rainy, high-temperature environments, the chassis cannot be protected from rain and high temperature on the ground.

[0003] Therefore, it is necessary to develop a new technology to solve the above problems. Summary of the invention

[0004] In view of this, the present invention aims at the deficiencies in the prior art, and its main purpose is to provide a manufacturing process for a string photovoltaic grid-connected inverter chassis, which can protect the surface of each component, avoid the phenomenon that the surface of each component is easily damaged, make the overall appearance more beautiful, and realize simple assembly between the components. The manufacturing process is simple and the assembly is convenient. It can also prevent the welding slag from pressing on the rubber strip and affecting the air tightness. It has lightning protection performance, improves assembly efficiency, reduces the impact of the external environment on the chassis, and improves the overall structural strength.

[0005] To achieve the above purpose, the present invention adopts the following technical solutions:

[0006] A manufacturing process for a series photovoltaic grid-connected inverter chassis includes the following steps:

[0007] Step 1, prepare a base, a box, an upper cover, and a maintenance box; the box is a rectangular parallelepiped structure with an upper opening, and the box includes a lower side panel, a left side panel, a right side panel, a front side panel, and a rear side panel; the corresponding joints between the lower side panel, the left side panel, the right side panel, the front side panel, and the rear side panel are connected by welding, so that the lower side panel, the left side panel, the right side panel, the front side panel, and the rear side panel together form a cavity;

[0008] Step 2, spraying and protecting the inner wall of the cavity and the lower inner wall of the upper cover;

[0009] Step 3, the maintenance box includes a body with an opening on one side and a maintenance cover provided at the opening of the body, the maintenance cover and the body form a maintenance cavity, the inner wall of the maintenance cavity is sprayed for protection, and the outer wall of the maintenance cover is sprayed for protection;

[0010] Step 4: Install the box body on top of the base, install the main body of the maintenance box on the outer wall of the left side plate of the box body, and install the upper cover on the upper opening of the box body.

[0011] As a preferred solution, a rectangular-shaped clip portion is protruding outward from the upper opening of the box body, and the lower ends of the four sides of the clip portion are integrally connected to the left plate, the right plate, the front plate and the rear plate respectively. The four sides of the clip portion are connected to each other by welding, and the four corner welding points of the clip portion and the four corner welding points of the upper opening of the box body are polished and smooth inside and outside. The clip portion is clamped with a rubber strip, and the four corner side surfaces and the lower surface of the lower inner wall of the upper cover are polished and smooth, and the rubber strip is located between the clip portion and the upper cover.

[0012] As a preferred solution, the lower side plate is provided with a plurality of installation clearance through holes, and the periphery of the lower surface corresponding to each installation clearance through hole is spray-coated for protection.

[0013] As a preferred embodiment, a lightning protection plate, a lightning protection plate support, an auxiliary source plate, and a capacitor plate support plate are provided in the cavity; before step 4, the upper and lower surfaces of the lightning protection plate support plate, the upper and lower surfaces of the auxiliary source plate, and the supporting part of the capacitor plate support plate are sprayed for protection on both sides; in step 4, after the maintenance box is installed on the outer wall of the left side plate of the box body, the lightning protection plate support is assembled in a suspended manner in the rear area of ​​the lower side plate, the lightning protection plate is assembled on the upper surface of the lightning protection plate support, the auxiliary source plate is assembled in a suspended manner in the middle area of ​​the lower side plate and the rear side of the auxiliary source plate extends to the front and upper part of the lightning protection plate, the capacitor plate support plate is assembled on the inner wall of the right side plate and the lower left side of the capacitor plate support plate extends to the left and abuts against the upper surface of the lower side plate, and then the upper cover is installed at the upper opening of the box body.

[0014] As a preferred solution, the base has a accommodating cavity with an upper opening, and a fan fixing plate for fixing the fan is arranged in the accommodating cavity; before step 4, the surface of the fan fixing plate is sprayed for protection; in step 4, the fan fixing plate is first assembled in the accommodating cavity of the base, and then the box is installed on top of the base.

[0015] As a preferred solution, the left side wall, right side wall and rear side wall at the upper end opening of the base are provided with locking plates for screw-locking connection with the box body, the locking plates of the left side wall and the right side wall are both in contact with the lower surface of the lower side plate, the locking plate of the rear side wall is in contact with the rear side surface of the rear side plate, the front side surface of the front side plate is limited by the stop part of the front side wall of the base, the stop part extends upward from the upper end of the front side wall of the base, and the stop part is connected to the front side plate by screw locking.

[0016] As a preferred solution, grounding plates are connected to the left and right sides of the lower surface of the lower side panel; before step 4, the grounding plate is sprayed for protection; in step 4, the grounding plate is first assembled on the lower side panel of the box body, and then the main body of the maintenance box is installed on the outer wall of the left side panel of the box body, and the maintenance box is located on the left side of the grounding plate on the left side of the lower side panel.

[0017] As a preferred solution, the left and right sides of the rear side panel are fixedly connected with connecting parts, and the connecting parts on the left and right sides extend out of the left side of the left side panel and the right side of the right side panel respectively, and the lower end of the connecting part extends downward out of the lower end of the base, and the lower end of the connecting part is connected to a wire bridge, and the wire bridge extends forward, and a fixing part is connected to the upper part of the front end of the wire bridge, and the fixing part is connected to the front side of the lower surface of the lower side panel, and the wire bridges on the left and right sides are connected by a cross beam, and the cross beam is located below the base and is set to keep a distance from the base; in the step 4, after the box body is installed on the top of the base, the connecting part, the wire bridge, the fixing part, and the cross beam are first assembled on the box body, and then the main body of the maintenance box is installed on the outer wall of the left side panel of the box body.

[0018] Compared with the prior art, the present invention has obvious advantages and beneficial effects. Specifically, it can be seen from the above technical scheme that it mainly performs spray protection treatment on the inner wall of the cavity, the lower inner wall of the upper cover, the inner wall of the maintenance cavity of the maintenance box, the outer wall of the maintenance cover, etc., and then assembles the components, so that the surfaces of the components can be protected, and the phenomenon that the surfaces of the components are easily damaged is avoided, the overall appearance is more beautiful, and simple assembly between the components is achieved. The manufacturing process is simple and the assembly is convenient. In addition, by polishing and smoothing the four corner sides and the lower surface of the lower inner wall of the upper cover, and locating the rubber strip between the clamping part and the upper cover, it can be prevented that welding slag presses on the rubber strip and affects the air tightness. The setting of the maintenance box is conducive to later maintenance and improves the user experience. Secondly, through the combined design of the lightning protection plate and the lightning protection plate support, it has lightning protection performance and achieves The invention provides a simple assembly of the lightning protection board, and through the combined design of the auxiliary source board and the capacitor board support board, it has an assembly positioning structure for the components, so that the components can be assembled at the corresponding positions more quickly and accurately, thereby improving the assembly efficiency. In addition, by arranging a locking plate on the base and limiting the front side plate of the box body by the stopper of the front side wall of the base, the assembly connection between the base and the box body is realized, and at the same time, precise limiting can be achieved through the stopper, which is more conducive to the subsequent locking of the screws. Through the arrangement of the grounding plate, it is beneficial to the grounding of the box body. In addition, through the combined design of the connecting parts, the wire bridge, the fixing parts and the crossbeam, a supporting structure is formed, and the base and the box body can be assembled on the external structure as a whole through the supporting structure, thereby avoiding the phenomenon that the base and the box body directly contact the external structure, thereby reducing the influence of the external environment on the chassis. At the same time, the supporting structure can provide better support and improve the overall structural strength.

[0019] In order to more clearly illustrate the structural features, technical means and specific purposes and functions achieved by the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a three-dimensional schematic diagram of the overall structure of an embodiment of the present invention;

[0021] Figure 2 It is a three-dimensional schematic diagram of the overall structure of an embodiment of the present invention from another angle;

[0022] Figure 3 This is another perspective schematic diagram of the overall structure of an embodiment of the present invention;

[0023] Figure 4 is an exploded view of an embodiment of the present invention;

[0024] Figure 5 yes Figure 4 Another exploded view of the structure shown;

[0025] Figure 6 is another exploded view of an embodiment of the present invention;

[0026] Figure 7 It is another exploded view of an embodiment of the present invention.

[0027] Description of the accompanying drawings:

[0028] 10. Base 11. Accommodation cavity

[0029] 12. Fan fixing plate 13. Locking plate

[0030] 14. Stopper 20. Box

[0031] 21. Lower side panel 22. Left side panel

[0032] 23. Right side panel 24. Front side panel

[0033] 25. Rear side panel 26. Cavity

[0034] 27. Snap-on portion 28. Rubber strip

[0035] 29. Install the clearance hole

[0036] 30. Upper cover 40. Maintenance box

[0037] 41. Main body 42. Maintenance cover

[0038] 43, maintenance cavity 50, lightning protection board

[0039] 60. Lightning protection board support 70. Auxiliary source board

[0040] 80. Capacitor plate support plate 90. Ground plate

[0041] 101. Connector 102. Cable bridge

[0042] 103. Fixing member 104. Crossbeam. DETAILED DESCRIPTION

[0043] Please refer to Figures 1 to 7 As shown, it shows the specific structure of an embodiment of the present invention.

[0044] A manufacturing process of a series photovoltaic grid-connected inverter chassis includes the following steps: Step 1, preparing a base 10, a box body 20, an upper cover 30, and a maintenance box 40; the box body 20 is a rectangular parallelepiped structure with an upper opening, and the box body 20 includes a lower side plate 21, a left side plate 22, a right side plate 23, a front side plate 24, and a rear side plate 25; corresponding joints between the lower side plate 21, the left side plate 22, the right side plate 23, the front side plate 24, and the rear side plate 25 are connected by welding, so that the lower side plate 21, the left side plate 22, the right side plate 23, the front side plate 24, and the rear side plate 25 are collectively enclosed to form a cavity 26; Here, after welding, the welding slag and sharp angles in the welding area should be removed, and pinholes are not allowed to exist after welding grinding. After pre-treatment, it is necessary to check whether the dead corners of the seam are dried and placed on clean pallets to prevent secondary pollution. There should be no sand and pinholes on the surface after spraying; a lightning protection plate 50, a lightning protection plate support 60, an auxiliary source plate 70, and a capacitor plate support plate 80 are arranged in the cavity 26; a rectangular-shaped clamping portion 27 is convexly extended outward from the upper opening of the box body 20, and the lower ends of the four sides of the clamping portion 27 are respectively connected to the left side plate 22, the right side plate 23, the front side plate 24, and the rear side plate 25 as a whole, and the four sides of the clamping portion 27 are The edges are connected to each other by welding, and the four corner welding points of the clamping part 27 and the four corner welding points of the upper opening of the box body 20 are polished and smoothed inside and outside; the clamping part 27 is clamped with a rubber strip 28, and the four corner side surfaces and the lower surface of the lower inner wall of the upper cover 30 are polished and smoothed to prevent welding slag from pressing on the rubber strip 28 and affecting the airtightness. The rubber strip 28 is located between the clamping part 27 and the upper cover 30; the upper and lower surfaces of the support plate of the lightning protection plate 50, the upper and lower surfaces of the auxiliary source plate 70, and the supporting part of the capacitor plate support plate 80 are sprayed for protection on both sides; the left and right sides of the rear side plate 25 are A connecting piece 101 is fixedly connected, and the connecting pieces 101 on the left and right sides extend out of the left side of the left plate 22 and the right side of the right plate 23 respectively. The lower end of the connecting piece 101 extends downwardly out of the lower end of the base 10. The lower end of the connecting piece 101 is connected to a wire bridge 102, and the wire bridge 102 extends forward. A fixing piece 103 is connected to the upper part of the front end of the wire bridge 102, and the fixing piece 103 is connected to the front side of the lower surface of the lower side plate 21. The left and right wire bridges 102 are connected by a cross beam 104, and the cross beam 104 is located below the base 10 and is set to maintain a distance from the base 10.

[0045] Step 2, spray-coat the inner wall of the cavity 26 and the lower inner wall of the upper cover 30 for protection; the lower side plate 21 is provided with a plurality of installation clearance holes 29, and the periphery of the lower surface of each installation clearance hole 29 is spray-coated for protection.

[0046] Step 3, the maintenance box 40 includes a main body 41 with an opening on one side and a maintenance cover 42 covered at the opening of the main body 41, the maintenance cover 42 and the main body 41 form a maintenance cavity 43, the inner wall of the maintenance cavity 43 is sprayed with protection, and the outer wall of the maintenance cover 42 is sprayed with protection; the base 10 has a accommodating cavity 11 with an opening at the upper end, and a fan fixing plate 12 for fixing the fan is arranged in the accommodating cavity 11; the surface of the fan fixing plate 12 is sprayed with protection; the left and right sides of the lower surface of the lower side plate 21 are connected to the grounding plate 90; the grounding plate 90 is sprayed with protection.

[0047] Step 4, assemble the fan fixing plate 12 into the accommodating cavity 11 of the base 10, and install the box body 20 on the top of the base 10. The left side wall, right side wall and rear side wall at the upper end opening of the base 10 are provided with locking pieces 13 for screw locking connection with the box body 20. The locking pieces 13 of the left side wall and the right side wall are both in contact with the lower surface of the lower side plate 21, and the locking piece 13 of the rear side wall is in contact with the rear side surface of the rear side plate 25. The front side surface of the front side plate 24 is limited by the stopper 14 of the front side wall of the base 10. The stopper 14 extends upward from the upper end of the front side wall of the base 10 as a whole, and the stopper 14 is connected to the front side plate 24 by screw locking. Assemble the grounding plate 90 on the lower side plate 21 of the box body 20, assemble the connecting piece 101, the wire bridge 102, the fixing piece 103, and the cross beam 104 on the box body 20, install the main body 41 of the maintenance box 40 on the outer side wall of the left side plate 22 of the box body 20, and the maintenance box 40 is located on the left side of the grounding plate 90 on the left side of the lower side plate 21, assemble the lightning protection plate support 60 in the air on the rear area of ​​the lower side plate 21, and assemble the lightning protection plate 50. On the upper surface of the lightning protection plate support 60, the auxiliary source plate 70 is assembled in a suspended manner in the middle area of ​​the lower side plate 21 and the rear side of the auxiliary source plate 70 extends to the front and upper part of the lightning protection plate 50, the capacitor plate support plate 80 is assembled on the inner wall of the right side plate 23 and the lower left side of the capacitor plate support plate 80 extends to the left and abuts against the upper surface of the lower side plate 21, the rubber strip 28 is clamped on the clamping part 27, and the upper cover 30 is installed at the upper opening of the box body 20.

[0048] To sum up, the design focus of the present invention is that it mainly carries out spray protection treatment on the inner wall of the cavity, the lower inner wall of the upper cover, the inner wall of the maintenance cavity of the maintenance box, the outer wall of the maintenance cover, etc., and then assembles the components, so that the surface of each component can be protected, and the phenomenon that the surface of each component is easily damaged is avoided, the overall appearance is more beautiful, and simple assembly between the components is achieved. The manufacturing process is simple and the assembly is convenient. In addition, by polishing and smoothing the four corner sides and the lower surface of the lower inner wall of the upper cover, and locating the rubber strip between the clamping part and the upper cover, it can be prevented that welding slag presses on the rubber strip and affects the air tightness. The setting of the maintenance box is conducive to later maintenance and improves the user experience effect. Secondly, through the combined design of the lightning protection board and the lightning protection board support, it has lightning protection performance and simple assembly of the lightning protection board is achieved. Through the combined design of the auxiliary source plate and the capacitor plate support plate, it has an assembly positioning structure for the components, so that the components can be assembled at the corresponding positions more quickly and accurately, thereby improving the assembly efficiency. In addition, by arranging a locking plate on the base and limiting the front side plate of the box body by the stopper of the front side wall of the base, the assembly connection between the base and the box body is realized, and at the same time, precise limiting can be achieved through the stopper, which is more conducive to the subsequent locking of the screws. The provision of the grounding plate is beneficial to the grounding of the box body. In addition, through the combined design of the connecting parts, the wire bridge, the fixing parts and the crossbeam, a supporting structure is formed, and the base and the box body can be assembled on the external structure as a whole through the supporting structure, thereby avoiding the phenomenon that the base and the box body directly contact the external structure, thereby reducing the influence of the external environment on the chassis. At the same time, the supporting structure can provide better support and improve the overall structural strength.

[0049] The above description is only a preferred embodiment of the present invention and does not limit the technical scope of the present invention. Therefore, any slight modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A manufacturing process for a series photovoltaic grid-connected inverter chassis, characterized in that: The steps include: The left and right sides of the rear panel are connected with the support frame by welding, and the left and right sides of the rear panel are connected with the support frame by welding, so that the left and right sides of the rear panel are connected with the support frame together to form a cavity; the left and right sides of the rear panel are fixedly connected with connecting pieces, and the connecting pieces on the left and right sides extend out of the left side of the left panel and the right side of the right panel respectively, and the lower end of the connecting piece extends downward out of the lower end of the base, and the lower end of the connecting piece is connected with a wire bridge, and the wire bridge extends forward, and the upper part of the front end of the wire bridge is connected with a fixing piece, and the fixing piece is connected to the front side of the lower surface of the lower side panel, and the wire bridges on the left and right sides are connected by a cross beam, and the cross beam is located below the base and is arranged to keep a distance from the base; Step 2, spraying the inner wall of the cavity and the lower inner wall of the upper cover for protection; the lower side plate is provided with a plurality of installation clearance holes, and the periphery of the lower surface of each installation clearance hole is sprayed for protection; Step 3, the maintenance box includes a body with an opening on one side and a maintenance cover arranged at the opening of the body, the maintenance cover and the body form a maintenance cavity, the inner wall of the maintenance cavity is sprayed with protective treatment, and the outer wall of the maintenance cover is sprayed with protective treatment; the base has a receiving cavity with an opening at the upper end, and a fan fixing plate for fixing the fan is arranged in the receiving cavity; the surface of the fan fixing plate is sprayed with protective treatment; the left and right sides of the lower surface of the lower side plate are connected to grounding plates; the grounding plates are sprayed with protective treatment; Step 4: First assemble the fan fixing plate into the accommodating cavity of the base, install the box on top of the base, first assemble the grounding plate on the lower side plate of the box, assemble the connectors, wire bridges, fixings, and beams on the box, and then install the main body of the maintenance box on the outer wall of the left side plate of the box, with the maintenance box located on the left side of the grounding plate on the left side of the lower side plate, and install the upper cover on the upper opening of the box.

2. The manufacturing process of the series photovoltaic grid-connected inverter chassis according to claim 1, characterized in that: A rectangular-shaped clip portion is protruding outward from the upper opening of the box body, and the lower ends of the four sides of the clip portion are respectively integrally connected to the left plate, the right plate, the front plate, and the rear plate. The four sides of the clip portion are connected to each other by welding, and the four corner welding points of the clip portion and the four corner welding points of the upper opening of the box body are polished and smooth inside and outside. The clip portion is clamped with a rubber strip, and the four corner side surfaces and the lower surface of the lower inner wall of the upper cover are polished and smooth, and the rubber strip is located between the clip portion and the upper cover.

3. The manufacturing process of the series photovoltaic grid-connected inverter chassis according to claim 1, characterized in that: A lightning protection plate, a lightning protection plate support, an auxiliary source plate, and a capacitor plate support plate are arranged in the cavity; before step 4, the upper and lower surfaces of the lightning protection plate support plate, the upper and lower surfaces of the auxiliary source plate, and the supporting part of the capacitor plate support plate are sprayed for protection on both sides; in step 4, after the maintenance box is installed on the outer wall of the left side plate of the box body, the lightning protection plate support member is suspended and assembled in the rear area of ​​the lower side plate, the lightning protection plate is assembled on the upper surface of the lightning protection plate support member, the auxiliary source plate is suspended and assembled in the middle area of ​​the lower side plate and the rear side of the auxiliary source plate extends to the front upper part of the lightning protection plate, the capacitor plate support plate is assembled on the inner wall of the right side plate and the lower left side of the capacitor plate support plate extends to the left and abuts against the upper surface of the lower side plate, and then the upper cover is installed at the upper opening of the box body.

4. The manufacturing process of a series photovoltaic grid-connected inverter chassis according to claim 1, characterized in that: The left side wall, right side wall and rear side wall at the upper end opening of the base are all provided with locking plates for screw locking connection with the box body, the locking plates of the left side wall and the right side wall are both in contact with the lower surface of the lower side plate, the locking plate of the rear side wall is in contact with the rear side surface of the rear side plate, the front side surface of the front side plate is limited by the stop part of the front side wall of the base, the stop part is integrally extended upward from the upper end of the front side wall of the base, and the stop part is connected to the front side plate by screw locking.

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