Riveting-free aluminum alloy protective cover for dry-type transformer

Abstract

The utility model provides a riveting-free aluminum alloy protective cover for a dry-type transformer, and relates to the technical field of transformer manufacturing. Comprising a rectangular main body (1), a top cover and a base (2), corresponding mortise and tenon joint structures and fasteners (10) are arranged between main body plates of the protective cover, and corresponding installation procedures are matched, so that external connection in the whole field installation process of the protective cover can be realized, an operator does not need to carry out internal operation of the protective cover, the installation procedures are greatly simplified, and the working efficiency is improved. The installation difficulty is reduced, the labor intensity is reduced, and the efficiency is improved; besides, through ventilation and heat dissipation mechanisms arranged on the base (2) and the split type top cover, when the power is low, the requirement can be met through free flow of air, when the working power of the transformer is increased and the heat productivity is increased, a bearing top plate (3) and a functional top plate (4) on the top cover are connected and matched with an air draft mechanism (6) to form a closed air circulation channel, the heat dissipation efficiency is greatly improved, and the service life of the transformer is prolonged. The protective cover is reasonable in layout and low in use cost.

Description

Technical Field

[0001] This utility model relates to the field of transformer manufacturing technology, specifically to an aluminum alloy protective cover for a rivetless dry-type transformer. Background Technology

[0002] In the field of power equipment, dry-type transformers are widely used in various places due to their many advantages. Compared with oil-immersed transformers, their biggest advantage is their simple structure and high safety, so they can be used in areas with high traffic. For this reason, dry-type transformers need reliable protective devices to ensure their stable operation and extend their service life.

[0003] Traditional dry-type transformer protective covers are usually manufactured and assembled together with the transformer body by the manufacturer and then transported to the site. The overall size is large, which makes transportation difficult. In addition, the traditional protective covers are assembled by riveting, which has many drawbacks: First, the riveting process usually requires internal and external coordination, which is difficult to operate, and the labor intensity and time consumption of workers are high, and the skill requirements of operators are also high. At the same time, the riveted joints are prone to loosening and corrosion due to long-term use, which affects the overall protective performance and stability of the protective cover.

[0004] In addition, existing dry-type transformer protective covers are also difficult to achieve ideal performance in terms of heat dissipation and ventilation. Dry-type transformers generate heat during operation. If the heat dissipation and ventilation design of the protective cover is unreasonable, it will lead to heat accumulation inside the transformer and excessively high temperature, thereby reducing the transformer's operating efficiency and service life.

[0005] In conclusion, developing a rivetless aluminum alloy protective cover for dry-type transformers that can overcome the above-mentioned defects is of great practical significance, as it will provide a more reliable guarantee for the stable and efficient operation of dry-type transformers. Summary of the Invention

[0006] To address the aforementioned problems, this utility model provides a riveted-free aluminum alloy protective cover for dry-type transformers.

[0007] This application adopts the following technical solution: a riveted dry-type transformer aluminum alloy protective cover, comprising a rectangular body 1, a top cover, and a base 2, characterized in that:

[0008] The top cover adopts a double-layer split structure, including a load-bearing top plate 3 fixedly connected to the main body, and a functional top plate 4 set above the load-bearing top plate 3.

[0009] The supporting top plate 3 is provided with a cooling air outlet. A geometric ventilation duct 3-1 protruding from the supporting top plate 3 is provided around the edge of the air outlet on its upper side. An inverted trapezoidal groove 3-2 with the same shape as the ventilation duct 3-1 is provided at the middle of the upper end face. A sealing layer is provided on the surface of the trapezoidal groove 3-2.

[0010] The functional top plate 4 is located above the supporting top plate 3 and is connected to the functional top plate 4 by lifting rods 5 located at the four corners of the supporting top plate 3. On the lower surface of the functional top plate 4, in the area opposite to the ventilation duct 3-1 on the supporting top plate 3, a corresponding connecting pipe 4-1 is also provided. On the lower edge surface of the connecting pipe 4-1, a trapezoidal protrusion 4-2 is provided that matches the inverted trapezoidal groove 3-2 opened at the middle of the upper end face of the ventilation duct 3-1. The surface of the trapezoidal protrusion 4-2 is also provided with a sealing layer. An exhaust mechanism 6 is provided on the upper surface of the functional top plate 4 and is connected to the connecting pipe 4-1 on the lower surface of the functional top plate 4. When the lifting mechanism falls, it drives the functional top plate 4 and its exhaust mechanism 6 to fall as a whole until the trapezoidal protrusion 4-2 on the connecting pipe 4-1 on its lower surface engages with the trapezoidal groove 3-2 on the ventilation pipe 3-1 on the functional top plate 4. The ventilation pipe 3-1 and the connecting pipe 4-1 are connected as one unit, and together with the exhaust mechanism 6, they form an exhaust cooling system that acts on the inside of the protective cover.

[0011] The base 2, located below the rectangular main body 1, has a cavity inside. Ventilation holes 2-1 are provided on all four side walls of the cavity. A filter layer is provided on the inner surface of the side walls. Airflow holes are evenly distributed on the top sealing plate of the cavity. These airflow holes are connected to the interior of the rectangular main body 1 of the protective cover. External airflow enters the rectangular main body 1 through the ventilation holes 2-1 on the side walls, passes through the filter layer, and carries away the heat generated by the transformer. The heat is then discharged along the ventilation duct 3-1 on the top plate 3.

[0012] The rectangular main body 1 includes a front panel 1-1 and a back panel 1-2, as well as two side panels 1-3 on the left and right sides. The front panel 1-1, the back panel 1-2, and the two side panels 1-3 are arranged opposite to each other. The two side panels 1-3 have the same structure, consisting of sheet metal fitted into a bracket composed of a frame, longitudinal beams, and transverse beams. The front panel 1-1 includes a fixed frame and a movable door panel. The outer side of the fixed frame is fixedly connected to the two side panels 1-3 on both sides, and the movable door panel is connected to the inner side of the fixed frame by a hinge.

[0013] The connection between the frame and the longitudinal beam and the board is a mortise and tenon structure; there are three types of mortise and tenon structures, namely, the vertical connection mortise and tenon structure 7 located at the four corners of the rectangular main body 1, connecting the side plate 1-3 and the back plate 1-2 and connecting the side plate 1-3 and the panel 1-1; the double-headed mortise and tenon structure 8 connecting the board on the side plate 1-3 or the back plate 1-2 to the longitudinal beam; and the single-headed mortise and tenon structure 9 connecting the fixed frame and the movable door panel on the panel 1-1.

[0014] Based on the horizontal cross-section, the vertical connection mortise and tenon structure 7 includes two mutually perpendicular outer support plates 7-1 on the outer side and an inner support plate 7-2 with an arc shape on the inner side. The ends of the outer support plates 7-1 and the inner support plates 7-2 are connected together by mortises. A reinforcing plate 7-3 connected to both the inner support plate 7-2 and the outer support plates 7-1 is provided between them. The mortise uses a dovetail groove 7-4, and the tenon head that matches it uses a dovetail protrusion 7-5 with rectangular grooves 7-6 at both ends. The outer rectangular groove 7-6 is used with an adhesive layer to fix the board. The inner rectangular groove 7-6 is inserted into the dovetail groove 7-4 structure by the dovetail protrusion 7-5. That is, after the tenon and the mortise are combined, a wedge 7-7 is inserted into the rectangular groove 7-6 to tightly connect the two.

[0015] The double-headed mortise and tenon structure 8 includes a frame or longitudinal beam with dovetail grooves 7-4 on both sides, two dovetail protrusions 7-5 with rectangular grooves 7-6 on both sides that cooperate with the frame or longitudinal beam, and wedges 7-7 inserted into the rectangular grooves 7-6.

[0016] The single-head mortise and tenon structure 9 includes a frame or longitudinal beam with a dovetail groove 7-4 on any one side, a dovetail protrusion 7-5 with a rectangular groove 7-6 on both sides that cooperates with the frame or longitudinal beam, and a wedge 7-7 inserted into the rectangular groove 7-6.

[0017] Dry-type transformers generate continuous slight vibrations during operation. Over time, this can cause the wedges 7-7 inserted in the mortise and tenon structure to gradually loosen, especially the wedges 7-7 in the inner rectangular groove of the vertical connection mortise and tenon structure. If they loosen, the gap between the outer support plate and the inner support plate will increase, reducing the overall structural strength. Therefore, the wedges 7-7 installed in the rectangular groove 7-6 adopt an elastic composite structure, with an outer metal skeleton and an inner rubber liner. The elastic deformation of the rubber liner can compensate for the vibration gap and prevent loosening.

[0018] Preferably, serrated patterns are added to the contact surfaces of the dovetail protrusion (7-5) and the dovetail groove (7-4) to enhance the interlocking force by increasing friction.

[0019] Preferably, hemispherical protrusions with a diameter of 0.5-1mm are provided on the surface of the dovetail protrusions 7-5 of the double-headed mortise and tenon structure 8 and the single-headed mortise and tenon structure 9, forming point contact with the inner wall of the dovetail groove of the frame and the longitudinal beam, reducing the dependence on the overall dimensional accuracy, and still being able to stably engage even with slight deformation.

[0020] Preferably, inside the rectangular body 1, fasteners 10 are provided between any two perpendicularly intersecting plates, i.e., on the inner side of the intersection of the front panel 1-1 or the back panel 1-2 and the left and right side panels 1-3, for mutual support and connection; the horizontal cross section of the fastener 10 is a hollow triangle, and the two right-angled sides of the fastener 10 are respectively attached to the front panel 1-1 and the side panel 1-3, or the back panel 1-2 and the side panel 1-3.

[0021] The first right-angled side 10-1, which is in contact with the panel 1-1 or the back panel 1-2, is pre-welded and fixed to the panel 1-1 or the back panel 1-2. The second right-angled side 10-2 is in contact with the side panel 1-3. A bolt hole 10-3 is provided on the second right-angled side 10-2, which penetrates outward through the corresponding side panel 1-3. Inside the fastener 10 opposite to the bolt hole 10-3, a nut 10-5 that can move axially for a certain stroke and is fixed circumferentially is provided, as well as a positioning spring 10-4 that prevents it from rotating. The positioning spring 10-4 is composed of several self-bent spring pieces with grooves on their inner sides surrounding the nut. The bolt hole 10-3 is formed, and both ends are fixed to the inside of the fastener 10. The bolt passes through the bolt hole 10-3 from the outside of the corresponding side plate 1-3 and penetrates the second right angle side 10-2. Then it engages with the nut 10-5, which is opposite the bolt hole 10-3, located inside the fastener 10, and is clamped on the positioning spring 10-4. The bolt is continuously rotated from the outside. Since the nut 10-5 will not rotate axially under the fixation of the positioning spring 10-4, the bolt and the nut 10-5 are continuously tightened, thereby firmly connecting the panel 1-1 or back plate 1-2, the side plate 1-3 and the fastener 10 together.

[0022] Preferably, the spacing between two adjacent fasteners (10) on the same mounting surface is 50-60cm.

[0023] Preferably, connectors 11 are provided at the four right-angled positions at the lower part of the rectangular body 1. Each connector 11 includes three connecting surfaces. The lower connecting surface 11-1, which is horizontally located at the bottom, is attached to the base 2 and connected by bolts. The other two side connecting surfaces 11-2 are respectively attached to and connected to the panel 1-1 and side plate 1-3, which are perpendicularly connected to each other in the rectangular body 1, or the side plate 1-3 and the back plate 1-2.

[0024] Each part of the protective cover described in this application is manufactured independently and assembled on site. During installation, the base 2 is installed on the concrete base, and then the electrical equipment is installed. After that, the main body of the protective cover is installed. The panel 1-1, the back panel 1-2 and the side panel 1-3 are connected and formed by the mortise and tenon structure on the frame, and the fasteners 10 are used to increase the strength. The main body is fixed to the base 2 from the outside using the connectors 11, and finally the top cover is fixed.

[0025] This utility model has the following beneficial effects:

[0026] ① By setting corresponding mortise and tenon structures and fasteners between the main body plates of the protective cover, and in conjunction with the corresponding installation process, the protective cover can be installed entirely externally on-site, eliminating the need for operators to perform internal work on the protective cover. This greatly simplifies the installation process, reduces installation difficulty, alleviates labor intensity, and significantly improves installation efficiency. At the same time, the modular design of the protective cover reduces the transportation volume of each component, lowers transportation costs, and optimizes the manufacturing process of the protective cover.

[0027] ② This utility model, through the ventilation and heat dissipation mechanism set on the base and the split top cover, can draw external air from the base 1 into the protective cover and then exhaust it from the top cover, directly carrying away the heat generated by the transformer and achieving the effect of air cooling. Furthermore, the natural ventilation mode and the forced exhaust mode can be switched. When the power is low, the requirements can be met by the free flow of air. When the transformer's operating power increases and the heat generation increases, the supporting top plate 3 and the functional top plate 4 on the top cover are connected to form a closed gas flow channel with the exhaust mechanism 6, which greatly improves the heat dissipation efficiency and ensures that the transformer's operating temperature is below the limit value.

[0028] ③ The protective cover described in this utility model adopts a lightweight design with a reasonable overall layout. It is lighter than traditional steel protective covers and has low operating costs. The mortise and tenon structure and fastener composite connection improve the protection level and service life of the main body of the protective cover. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of the protective cover described in this utility model.

[0030] Figure 2 This is a structural schematic diagram of the supporting top plate.

[0031] Figure 3 This is a structural schematic diagram of the functional top plate.

[0032] Figure 4 This is a schematic cross-sectional view of the rectangular body described in Example 1.

[0033] Figure 5 This is a schematic cross-sectional view of the rectangular body described in Example 2.

[0034] Figure 6 This is a schematic diagram of the fastener.

[0035] Figure 7 This is a schematic diagram of the vertical connection mortise and tenon structure.

[0036] Figure 8 This is a schematic diagram of the single-head mortise and tenon structure.

[0037] Figure 9 This is a schematic diagram of the double-headed mortise and tenon structure.

[0038] Figure 10 This is a structural schematic diagram of the connector.

[0039] In the diagram, the components are: 1. Rectangular main body; 2. Base; 3. Supporting top plate; 4. Functional top plate; 5. Ventilation duct; 6. Trapezoidal groove; 7. Lifting rod; 8. Connecting pipe; 9. Trapezoidal protrusion; 10. Exhaust mechanism; 11. Ventilation hole; 12. Panel; 13. Back plate; 14. Side plate; 15. Vertical connection tenon and mortise structure; 16. Double-headed tenon and mortise structure; 17. Single-headed tenon and mortise structure; 18. Outer support plate; 19. Inner support plate; 10. Reinforcing plate; 10. Dovetail groove; 10. Dovetail protrusion; 10. Rectangular groove; 11. Wedge; 12. Fastener; 13. First right angle side; 14. Second right angle side; 15. Bolt hole; 16. Nut; 17. Positioning spring; 18. Connector; 19. Lower connecting surface; 10. Side connecting surface; 10. Detailed Implementation Example 1

[0040] like Figure 1-4 As shown in Figures 7-10, this embodiment describes a riveted dry-type transformer aluminum alloy protective cover, which includes a rectangular main body 1, a top cover and a base 2; the top cover adopts a double-layer split structure, including a load-bearing top plate 3 fixedly connected to the main body, and a functional top plate 4 disposed above the load-bearing top plate 3.

[0041] The supporting top plate 3 is provided with a cooling air outlet. A geometric ventilation duct 3-1 protruding from the supporting top plate 3 is provided around the edge of the air outlet on its upper side. An inverted trapezoidal groove 3-2 with the same shape as the ventilation duct 3-1 is provided at the middle of the upper end face. A sealing layer is provided on the surface of the trapezoidal groove 3-2.

[0042] The functional top plate 4 is located above the supporting top plate 3 and is connected to the functional top plate 4 by lifting rods 5 located at the four corners of the supporting top plate 3. On the lower surface of the functional top plate 4, in the area opposite to the ventilation duct 3-1 on the supporting top plate 3, a corresponding connecting pipe 4-1 is also provided. On the lower edge surface of the connecting pipe 4-1, a trapezoidal protrusion 4-2 is provided that matches the inverted trapezoidal groove 3-2 opened at the middle of the upper end face of the ventilation duct 3-1. The surface of the trapezoidal protrusion 4-2 is also provided with a sealing layer. An exhaust mechanism 6 is provided on the upper surface of the functional top plate 4 and is connected to the connecting pipe 4-1 on the lower surface of the functional top plate 4. When the lifting mechanism falls, it drives the functional top plate 4 and its exhaust mechanism 6 to fall as a whole until the trapezoidal protrusion 4-2 on the connecting pipe 4-1 on its lower surface engages with the trapezoidal groove 3-2 on the ventilation pipe 3-1 on the functional top plate 4. The ventilation pipe 3-1 and the connecting pipe 4-1 are connected as one unit, and together with the exhaust mechanism 6, they form an exhaust cooling system that acts on the inside of the protective cover.

[0043] The base 2, located below the rectangular main body 1, has a cavity inside. Ventilation holes 2-1 are provided on all four side walls of the cavity. A filter layer is provided on the inner surface of the side walls. Airflow holes are evenly distributed on the top sealing plate of the cavity. These airflow holes are connected to the interior of the rectangular main body 1 of the protective cover. External airflow enters the rectangular main body 1 through the ventilation holes 2-1 on the side walls, passes through the filter layer, and carries away the heat generated by the transformer. The heat is then discharged along the ventilation duct 3-1 on the top plate 3.

[0044] The rectangular main body 1 includes a front panel 1-1 and a back panel 1-2, as well as two side panels 1-3 on the left and right sides. The front panel 1-1, the back panel 1-2, and the two side panels 1-3 are arranged opposite to each other. The two side panels 1-3 have the same structure, consisting of sheet metal fitted into a bracket composed of a frame, longitudinal beams, and transverse beams. The front panel 1-1 includes a fixed frame and a movable door panel. The outer side of the fixed frame is fixedly connected to the two side panels 1-3 on both sides, and the movable door panel is connected to the inner side of the fixed frame by a hinge.

[0045] The connection between the frame and the longitudinal beam and the board is a mortise and tenon structure; there are three types of mortise and tenon structures, namely, the vertical connection mortise and tenon structure 7 located at the four corners of the rectangular main body 1, connecting the side plate 1-3 and the back plate 1-2 and connecting the side plate 1-3 and the panel 1-1; the double-headed mortise and tenon structure 8 connecting the board on the side plate 1-3 or the back plate 1-2 to the longitudinal beam; and the single-headed mortise and tenon structure 9 connecting the fixed frame and the movable door panel on the panel 1-1.

[0046] Based on the horizontal cross-section, the vertical connection mortise and tenon structure 7 includes two mutually perpendicular outer support plates 7-1 on the outer side and an inner support plate 7-2 with an arc shape on the inner side. The ends of the outer support plates 7-1 and the inner support plates 7-2 are connected together by mortises. A reinforcing plate 7-3 connected to both the inner support plate 7-2 and the outer support plates 7-1 is provided between them. The mortise uses a dovetail groove 7-4, and the tenon head that matches it uses a dovetail protrusion 7-5 with rectangular grooves 7-6 at both ends. The outer rectangular groove 7-6 is used with an adhesive layer to fix the board. The inner rectangular groove 7-6 is inserted into the dovetail groove 7-4 structure by the dovetail protrusion 7-5. That is, after the tenon and the mortise are combined, a wedge 7-7 is inserted into the rectangular groove 7-6 to tightly connect the two.

[0047] The double-headed mortise and tenon structure 8 includes a frame or longitudinal beam with dovetail grooves 7-4 on both sides, two dovetail protrusions 7-5 with rectangular grooves 7-6 on both sides that cooperate with the frame or longitudinal beam, and wedges 7-7 inserted into the rectangular grooves 7-6.

[0048] The single-head mortise and tenon structure 9 includes a frame or longitudinal beam with a dovetail groove 7-4 on any one side, a dovetail protrusion 7-5 with a rectangular groove 7-6 on both sides that cooperates with the frame or longitudinal beam, and a wedge 7-7 inserted into the rectangular groove 7-6.

[0049] The pre-designed structures of the aforementioned components, including the dovetail grooves and protrusions of the tenon and mortise structure, the sealing layer, and the filter layer, are all pre-processed before leaving the factory. After completion, each component is transported separately to the site for installation. The specific installation process is as follows:

[0050] ① Place the base on the pre-set concrete base and fix it; the base has a hollow structure inside, and its four side walls are provided with ventilation holes. The inner surface of the side walls is equipped with a filter layer, and the top sealing plate is distributed with airflow holes that communicate with the interior of the rectangular main body; during installation, ensure that the base is placed horizontally and that the ventilation holes are not blocked, so that the external airflow can enter smoothly through the ventilation holes, be filtered by the filter layer, and then enter the interior of the rectangular main body through the airflow holes of the top sealing plate.

[0051] ② The rectangular main body consists of a front panel, a back panel, and left and right side panels. Each panel is connected to the frame, longitudinal beams, and transverse beams via mortise and tenon joints: Vertical mortise and tenon joints are used at the four corners of the rectangular main body to connect the side panels to the back panel and the side panels to the front panel. The dovetail grooves and dovetail protrusions at the ends of the outer and inner support plates engage, with wedges 7-7 inserted into the rectangular grooves of the dovetail protrusions to achieve a tight vertical connection; Double-headed mortise and tenon joints are used to connect the panels on the side or back panel to the longitudinal beams. The dovetail grooves on both sides of the frame or longitudinal beams engage with the dovetail protrusions 7-5 with rectangular grooves on both sides, and wedges 7-7 are inserted to complete the fixation; Single-headed mortise and tenon joints are used to connect the fixed frame on the front panel to the movable door panel. The dovetail groove on one side of the frame or longitudinal beam engages with the dovetail protrusion 7-5 with a rectangular groove on one side, and wedges 7-7 are inserted to achieve the connection.

[0052] ③ Install fasteners with a horizontal cross-section of a hollow triangle on the inner side of the vertical intersection of the panel and side panel, and the back panel and side panel; wherein, the first right-angle side of the fastener is pre-welded to the panel or back panel, and the second right-angle side is attached to the surface of the side panel; the bolt is inserted from the outside of the side panel, passes through the bolt hole of the second right-angle side, and engages with the nut fixed by the positioning spring inside the fastener. By rotating the bolt externally, the panel, side panel and fastener are firmly connected, enhancing the overall structural strength.

[0053] ④ Install connectors at the four right-angled parts at the bottom of the rectangular body. The lower connecting surface of the connector is attached to the base and fixed with bolts. The other two side connecting surfaces are attached to the perpendicular panels and side plates or the side plates and back plates of the rectangular body, respectively, thereby fixing the rectangular body to the base.

[0054] ⑤ Top cover installation: First, fix the supporting top plate to the top of the rectangular main body; the supporting top plate is provided with a cooling air outlet, and the edge of the outlet has a protruding ventilation duct. The upper end face of the ventilation duct has an inverted trapezoidal groove with a sealing layer in the middle; the functional top plate is connected to the supporting top plate through the lifting rods at the four corners of the rectangular main body. Its lower surface is provided with a connecting pipe corresponding to the ventilation duct. The lower edge of the connecting pipe has a trapezoidal protrusion that matches the trapezoidal groove and has a sealing layer; the upper surface is equipped with an exhaust mechanism that communicates with the connecting pipe.

[0055] ⑥ Heat dissipation mode: When the control lifting rod is raised, the functional top plate is separated from the supporting top plate. The air inside the rectangular body can circulate naturally through the ventilation duct of the supporting top plate, forming convection with the air intake of the base, which carries away the heat generated by the transformer. This is the natural ventilation mode. When the heat generated by the transformer increases, the control lifting rod is lowered, which drives the functional top plate to descend. This causes the trapezoidal protrusion of the connecting pipe to engage with the trapezoidal groove of the ventilation duct, forming a closed airflow channel. The exhaust mechanism is then activated to forcibly extract the air inside the rectangular body, accelerating the discharge of heat through the ventilation duct and connecting pipe. This is the forced ventilation mode. Example 2

[0056] refer to Figure 1-3 5-10. The aluminum alloy protective cover for a rivetless dry-type transformer described in this embodiment has a structure that is basically the same as that described in Embodiment 1. The difference is that: inside the rectangular main body 1, fasteners 10 are provided between any two perpendicularly intersecting plates, i.e., on the inner side of the intersection of the front panel 1-1 or the back panel 1-2 and the left and right side panels 1-3, for mutual support and connection; the horizontal cross section of the fastener 10 is a hollow triangle, and the two right-angled sides of the fastener 10 are respectively attached to the front panel 1-1 and the side panel 1-3, or the back panel 1-2 and the side panel 1-3.

[0057] The first right-angled side 10-1, which is in contact with the panel 1-1 or the back panel 1-2, is pre-welded and fixed to the panel 1-1 or the back panel 1-2. The second right-angled side 10-2 is in contact with the side panel 1-3. A bolt hole 10-3 is provided on the second right-angled side 10-2, which penetrates outward through the corresponding side panel 1-3. Inside the fastener 10 opposite to the bolt hole 10-3, a nut 10-5 that can move axially for a certain stroke and is fixed circumferentially is provided, as well as a positioning spring 10-4 that prevents it from rotating. The positioning spring 10-4 is composed of several self-bent spring pieces with grooves on their inner sides surrounding the nut. The bolt hole 10-3 is formed, and both ends are fixed to the inside of the fastener 10. The bolt passes through the bolt hole 10-3 from the outside of the corresponding side plate 1-3 and penetrates the second right angle side 10-2. Then it engages with the nut 10-5, which is opposite the bolt hole 10-3, located inside the fastener 10, and is clamped on the positioning spring 10-4. The bolt is continuously rotated from the outside. Since the nut 10-5 will not rotate axially under the fixation of the positioning spring 10-4, the bolt and the nut 10-5 are continuously tightened, thereby firmly connecting the panel 1-1 or back plate 1-2, the side plate 1-3 and the fastener 10 together.

[0058] Additionally, connectors 11 are provided at the four right-angled locations at the bottom of the rectangular body 1. Each connector 11 has three connecting surfaces. The lower connecting surface 11-1, which is horizontally positioned below, is attached to the base 2 and connected by bolts. The other two side connecting surfaces 11-2 are respectively attached to and connected to the panel 1-1 and side plate 1-3, which are perpendicularly connected to each other in the rectangular body 1, or to the back plate 1-2.

[0059] This implementation method enables rapid on-site assembly through modular design and external connection, and with a switchable heat dissipation system, it can effectively ensure the stable operation of dry-type transformers.

Claims

1. A riveted dry-type transformer aluminum alloy protective cover, comprising a rectangular body (1), a top cover, and a base (2), characterized in that: The rectangular main body (1) includes a front panel (1-1) and a back panel (1-2), as well as two side panels (1-3) on the left and right sides; wherein the front panel (1-1) and the back panel (1-2), as well as the two side panels (1-3) on the left and right sides, are arranged opposite to each other, and the two side panels (1-3) on the left and right sides have the same structure, which is formed by the plate being inserted into the bracket composed of the frame, longitudinal beams and transverse beams; the front panel (1-1) includes a fixed frame and a movable door panel, the outer side of the fixed frame is fixedly connected to the two side panels (1-3), and the movable door panel is connected to the inner side of the fixed frame by a hinge; The connection between the frame and the longitudinal beam and the board is made of mortise and tenon joints; there are three types of mortise and tenon joints, namely, the vertical connection mortise and tenon joints (7) located at the four corners of the rectangular main body (1), connecting the side panel (1-3) and the back panel (1-2) and connecting the side panel (1-3) and the panel (1-1); the double-headed mortise and tenon joints (8) connecting the board on the side panel (1-3) or the back panel (1-2) and the longitudinal beam; and the single-headed mortise and tenon joints (9) connecting the fixed frame and the movable door panel on the panel (1-1). Based on the horizontal section, the vertical connection mortise and tenon structure (7) includes two mutually perpendicular outer support plates (7-1) on the outer side and an inner support plate (7-2) with an arc shape on the inner side. The ends of the outer support plate (7-1) and the inner support plate (7-2) are connected together by mortises. A reinforcing plate (7-3) connected to both the inner support plate (7-2) and the outer support plate (7-1) is provided between them. The mortises adopt dovetail grooves (7-4) to match the mortises. The tenon head is made of dovetail protrusion (7-5) with rectangular grooves (7-6) at both ends; the outer rectangular groove (7-6) is used with the adhesive layer to fix the board, and the inner rectangular groove (7-6) is inserted into the dovetail groove (7-4) structure when the dovetail protrusion (7-5) is inserted into the dovetail groove (7-4). That is, after the tenon and mortise are combined, a wedge (7-7) is inserted into the rectangular groove (7-6). The wedge (7-7) adopts an elastic composite structure, with an outer metal skeleton and an inner rubber lining. The double-headed mortise and tenon structure (8) includes a frame or longitudinal beam with dovetail grooves (7-4) on both sides, two dovetail protrusions (7-5) with rectangular grooves (7-6) on both sides that cooperate with the frame or longitudinal beam, and a wedge (7-7) inserted into the rectangular groove (7-6). The single-head mortise and tenon structure (9) includes a frame or longitudinal beam with a dovetail groove (7-4) on any one side, a dovetail protrusion (7-5) with a rectangular groove (7-6) on both sides that cooperates with the frame or longitudinal beam, and a wedge (7-7) inserted into the rectangular groove (7-6).

2. A dry-type transformer aluminum alloy protective cover without rivets according to claim 1, characterized in that, The top cover adopts a double-layer split structure, including a load-bearing top plate (3) fixedly connected to the main body, and a functional top plate (4) set above the load-bearing top plate (3). The top plate (3) is provided with a cooling air outlet. A geometric ventilation duct (3-1) protruding from the top plate (3) is provided around the edge of the outlet on its upper side. An inverted trapezoidal groove (3-2) with the same shape as the ventilation duct (3-1) is provided at the middle of its upper end face. A sealing layer is provided on the surface of the trapezoidal groove (3-2). The functional top plate (4) is located above the supporting top plate (3) and is connected to the functional top plate (4) by lifting rods (5) located at the four corners of the supporting top plate (3). On the lower surface of the functional top plate (4), in the area opposite to the ventilation duct (3-1) on the supporting top plate (3), a corresponding connecting pipe (4-1) is also provided. On the lower edge surface of the connecting pipe (4-1), a trapezoidal protrusion (4-2) is provided that matches the inverted trapezoidal groove (3-2) opened at the middle of the upper end face of the ventilation duct (3-1). The surface of the trapezoidal protrusion (4-2) is also provided with a sealing layer. On the upper surface of the functional top plate (4), an exhaust mechanism (6) is provided and is connected to the connecting pipe (4-1) on the lower surface of the functional top plate (4).

3. A dry-type transformer aluminum alloy protective cover without rivets according to claim 1, characterized in that, The base (2) located below the rectangular main body (1) has a cavity inside. Ventilation holes (2-1) are provided on the four side walls of the cavity. A filter layer is provided on the inner surface of the side wall. Airflow holes are evenly distributed on the top sealing plate of the cavity. The airflow holes are connected to the interior of the rectangular main body (1) of the protective cover. External airflow enters the rectangular main body (1) through the ventilation holes (2-1) on the side wall and after passing through the filter layer, it carries away the heat generated by the transformer and is discharged along the ventilation pipe (3-1) on the top plate (3).

4. A dry-type transformer aluminum alloy guard according to claim 1, characterized in that, A serrated pattern is added to the contact surface between the dovetail protrusion (7-5) and the dovetail groove (7-4) to enhance the interlocking force by increasing friction.

5. A dry-type transformer aluminum alloy guard according to claim 1, characterized in that, A hemispherical protrusion with a diameter of 0.5-1mm is provided on the surface of the dovetail protrusion (7-5) of the double-headed mortise and tenon structure (8) and the single-headed mortise and tenon structure (9), forming point contact with the inner wall of the dovetail groove of the frame and the longitudinal beam.

6. A dry-type transformer aluminum alloy guard according to claim 1, wherein Inside the rectangular body (1), fasteners (10) are provided between any two perpendicularly intersecting plates, i.e., on the inner side of the intersection of the front panel (1-1) or back panel (1-2) and the left and right side panels (1-3), for mutual support and connection; the horizontal cross section of the fastener (10) is a hollow triangle, and the two right-angled sides of the fastener (10) are respectively attached to the front panel (1-1) and side panel (1-3), or the back panel (1-2) and side panel (1-3); The first right-angled edge (10-1) that is in contact with the panel (1-1) or the back plate (1-2) is pre-welded and fixed to the panel (1-1) or the back plate (1-2), and the second right-angled edge (10-2) is in contact with the side plate (1-3); a bolt hole (10-3) is opened on the second right-angled edge (10-2), the bolt hole (10-3) penetrates outward through the corresponding side plate (1-3), and a nut that can move axially and is fixed circumferentially is provided inside the fastener (10) opposite to the bolt hole (10-3). 10-5) and a positioning spring (10-4) to prevent it from rotating. The positioning spring (10-4) consists of several self-bent springs with grooves on the inside surrounding the bolt hole (10-3), with both ends fixed to the inside of the fastener (10). The bolt passes through the bolt hole (10-3) from the outside of the corresponding side plate (1-3) and penetrates the second right angle side (10-2), and then engages with the nut (10-5) which is opposite to the bolt hole (10-3), located inside the fastener (10), and is clamped on the positioning spring (10-4).

7. A dry-type transformer aluminum alloy protective cover without rivets according to claim 6, characterized in that, The spacing between two adjacent fasteners (10) on the same mounting surface is 50-60cm.

8. A dry-type transformer aluminum alloy guard shield according to claim 1, wherein, Connectors (11) are provided at the four right-angled parts at the bottom of the rectangular body (1). The connector (11) includes three connecting surfaces. The lower connecting surface (11-1) which is horizontally located at the bottom is attached to the base (2) and connected by bolts. The other two side connecting surfaces (11-2) are respectively attached to and connected to the panel (1-1) and side plate (1-3) which are perpendicularly connected to each other in the rectangular body (1), or the side plate (1-3) and back plate (1-2).

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