A splicing frame for a negative pressure fan

Abstract

This utility model belongs to the technical field of negative pressure fans, and relates to a splicing frame for a negative pressure fan. It includes an outer frame formed by splicing four identical splicing units. Each splicing unit has a first splicing end and a second splicing end at both ends. The first splicing end includes a first splicing slope with a splicing groove. The first splicing end extends along the edge of the outer frame to form an extension, and the extension has several insertion slots perpendicular to the edge of the outer frame. The second splicing end includes a second splicing slope with a splicing protrusion. A notch is provided at the position corresponding to the edge of the outer frame, and an insertion piece is disposed within the notch. The splicing frame for a negative pressure fan provided by this utility model can reduce mold and equipment costs in frame production and achieve a high-strength frame structure through simple assembly.

Description

Technical Field

[0001] This utility model belongs to the technical field of negative pressure fans, and relates to a splicing frame for a negative pressure fan. Background Technology

[0002] Various negative pressure fan equipment typically require a sturdy external frame to support the drive motor, fan blades, and necessary protective covers. Traditional negative pressure fan frames are mainly manufactured in two ways: one is integral molding (such as welding or casting), and the other is on-site assembly using disassembled parts such as angle iron.

[0003] While integrally molded frames (welded or cast) are robust, they incur high mold / tooling costs and poor production flexibility. On-site assembly using standard profiles such as angle iron, after cutting and drilling, addresses some flexibility issues but still presents the following problems: Insufficient connection strength and rigidity: Simple bolt connections fail to create stable, rigid nodes, leading to frame sway and affecting wind turbine operational stability. Assembly quality depends on worker skills: Assembly accuracy and squareness are difficult to guarantee, resulting in poor consistency.

[0004] Therefore, it is necessary to develop a new negative pressure fan frame structure that possesses strength and precision close to that of an overall structure, while also enabling standardized, modular, low-cost, flexible production and convenient assembly. Utility Model Content

[0005] This utility model addresses the shortcomings of existing technologies by providing a splicing frame for a negative pressure fan, which can reduce the mold and equipment costs of frame production and obtain a high-strength frame structure through simple assembly.

[0006] To solve the above-mentioned technical problems, the objective of this utility model is achieved through the following technical solution: A splicing frame for a negative pressure fan includes an outer frame formed by splicing four identical splicing units. Each splicing unit corresponds to one side of the outer frame and is spliced ​​together at the corner. The two ends of the splicing unit are respectively provided with a first splicing end and a second splicing end. The first splicing end includes a first splicing slope, and a splicing groove is provided on the first splicing slope. The first splicing end extends along the edge of the outer frame to form an extension, and a plurality of insertion slots perpendicular to the edge of the outer frame are provided on the extension. The second splicing end includes a second splicing slope, on which a splicing protrusion is provided. A notch is provided at the position where the second splicing end corresponds to the edge of the outer frame, and a connector piece is provided in the notch. The splicing structure of adjacent splicing units is as follows: the first splicing slope and the second splicing slope are matched and spliced, the extension and the notch are matched and spliced, and the insertion slot and the insertion piece are matched and spliced; the first splicing end and the second splicing end are fastened together by a connecting seat located on the rear side of the outer frame.

[0007] In the splicing frame of the aforementioned negative pressure fan, adjacent first splicing ends and second splicing ends are fixedly connected by several fasteners, and adjacent first splicing inclined surfaces and second splicing inclined surfaces are fixedly connected by several fasteners.

[0008] In the aforementioned splicing frame of a negative pressure fan, furthermore, the first splicing end, the second splicing end, the first splicing inclined surface, and the second splicing inclined surface are provided with connecting plates, connecting holes, or connecting posts that mate with fasteners. The fasteners are preferably bolts, which pass through the connecting plates, connecting holes, or connecting posts and are securely connected to the internal threads of the connecting plates, connecting holes, connecting posts, or nuts.

[0009] In the splicing frame of the aforementioned negative pressure fan, both the first splicing slope and the second splicing slope are inclined slopes of 45°.

[0010] In the splicing frame of the aforementioned negative pressure fan, both the splicing groove and the splicing protrusion are trapezoidal structures, with their cross-sectional areas gradually decreasing in the direction away from the splicing inclined surface, and the base angles of the trapezoids are all 45°.

[0011] In the above-mentioned splicing frame of a negative pressure fan, the splicing unit is a hollow structure, and a cover plate that seals its inner cavity is embedded in the splicing unit. The cover plate is fastened to the splicing unit. Preferably, the cover plate and the side of the splicing unit are arranged on the same plane.

[0012] In the above-mentioned splicing frame of a negative pressure fan, the splicing unit and the cover plate are configured with a concave-convex structure extending along their length direction. The splicing unit is provided with a reinforcing plate connecting its inner wall. Preferably, the reinforcing plate connects the front and rear side walls and the inner side wall of the splicing unit.

[0013] In the above-mentioned splicing frame of a negative pressure fan, the connecting seat is a trapezoidal block structure. Its bottom is fitted into the positioning groove on the rear side of the first splicing end and the second splicing end and is fastened by fasteners. Its top is provided with a connecting groove. A cross bracket is fixed in the connecting groove of the four connecting seats. The intersection of the cross brackets forms the motor mounting point.

[0014] Compared with the prior art, this utility model has the following advantages: 1. This utility model provides a splicing frame for a negative pressure fan, transforming the traditional bulky, complex, and difficult-to-manufacture integral frame mold required for negative pressure fans into a single, compact, simple, and easy-to-produce splicing unit mold. A complete outer frame can be formed by splicing four identical units. This change significantly reduces the difficulty and cost of mold development, substantially lowering production costs and shortening the development cycle for enterprises.

[0015] 2. Standardized assembly units facilitate large-scale, mass production, resulting in good product consistency. Furthermore, compared to a monolithic frame, modular components are more regular in shape and smaller in size, enabling higher space utilization and lower logistics costs in raw material transportation, semi-finished product warehousing, and finished product delivery.

[0016] 3. This utility model is easy to assemble and reliably connected, with a strong overall frame rigidity. Multiple splicing and fixing structures, including splicing bevels, splicing protrusions and grooves, notches and extensions, plug-in pieces and slots, and connecting seats, improve the overall stability of the frame and fully meet the vibration and load requirements of the negative pressure fan under high-speed operation. Attached Figure Description

[0017] Figure 1 This is a perspective view of the present invention; Figure 2 yes Figure 1 Enlarged view of point A; Figure 3 This is a perspective view of the splicing unit of this utility model; Figure 4 yes Figure 3 Enlarged view of point B; Figure 5 yes Figure 3 Enlarged view of point C; Reference numerals: 1. Splicing unit; 2. First splicing end; 3. Second splicing end; 4. First splicing bevel; 5. Splicing groove; 6. Extension; 7. Insertion slot; 8. Second splicing bevel; 9. Splicing protrusion; 10. Notch; 11. Insertion piece; 12. Connecting seat; 13. Connecting plate; 14. Connecting hole; 15. Connecting post; 16. Cover plate; 17. Reinforcing plate; 18. Positioning groove; 19. Cross bracket; 20. Motor. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. See also: Figure 1-5 : A splicing frame for a negative pressure fan includes an outer frame formed by splicing four identical splicing units 1. Each splicing unit 1 corresponds to one side of the outer frame and is spliced ​​together at the corner. The two ends of the splicing unit 1 are respectively provided with a first splicing end 2 and a second splicing end 3. The first splicing end 2 includes a first splicing inclined surface 4, on which a splicing groove 5 is provided. The first splicing end 2 extends along the edge of the outer frame to form an extension 6, on which a plurality of insertion grooves 7 perpendicular to the edge of the outer frame are provided. The second splicing end 3 includes a second splicing inclined surface 8, on which a splicing protrusion 9 is provided. A notch 10 is provided at the position where the second splicing end 3 corresponds to the edge of the outer frame, and a plug-in piece 11 is provided in the notch 10. In this embodiment, the extension 6 refers to a rectangular boss that protrudes outward from the edge of the first splicing end face and is used to fill the outline of adjacent units; the notch 10 refers to a rectangular clearance groove formed at the edge of the second splicing end 3, whose shape and size match the extension 6, and is used to accommodate the extension 6 during splicing so that the outer edge of the frame remains flush.

[0019] The splicing structure of adjacent splicing units 1 is as follows: the first splicing inclined surface 4 and the second splicing inclined surface 8 are matched and spliced, the extension 6 and the notch 10 are matched and spliced, and the insertion groove 7 and the insertion piece 11 are matched and spliced; the first splicing end 2 and the second splicing end 3 are fastened together by the connecting seat 12 located on the rear side of the outer frame.

[0020] During assembly, simply connect the four splicing units 1 in sequence to naturally form a multi-layered splicing structure in which the first splicing bevel 4 and the second splicing bevel 8 fit together, the splicing protrusion 9 is inserted into the splicing groove 5, and the plug-in piece 11 is inserted into the plug-in slot 7. Then, fix the connecting seat 12 to complete the rigid locking of each corner.

[0021] Furthermore, adjacent first splicing ends 2 and second splicing ends 3 are fixedly connected by several fasteners, and adjacent first splicing inclined surfaces 4 and second splicing inclined surfaces 8 are fixedly connected by several fasteners. Furthermore, the first splicing ends 2, second splicing ends 3, first splicing inclined surfaces 4, and second splicing inclined surfaces 8 are provided with connecting plates 13, connecting holes 14, or connecting posts 15 that mate with fasteners. The fasteners are preferably bolts, which pass through the connecting plates 13, connecting holes 14, or connecting posts 15 and are fastened to the internal threads of the connecting plates 13, connecting holes 14, connecting posts 15, or nuts (the nuts can be embedded in the connecting plates 13, connecting posts 15, or connecting holes 14). These fasteners make the connection between adjacent splicing units 1 more stable. The installation of the fasteners is carried out after splicing is completed.

[0022] Preferably, both the first splicing inclined surface 4 and the second splicing inclined surface 8 are 45° inclined surfaces. Preferably, both the splicing groove 5 and the splicing protrusion 9 are trapezoidal structures, with their cross-sectional areas gradually decreasing in the direction away from the splicing inclined surface. The base angles of the trapezoids are both 45°. By setting the 45° inclined surface and the trapezoidal structure with 45° base angles, the splicing unit 1 can be inserted vertically or horizontally to complete the splicing smoothly.

[0023] The splicing unit 1 is a hollow structure. A cover plate 16 is embedded in the splicing unit 1 to close its inner cavity. The cover plate 16 is fastened to the splicing unit 1. Preferably, the cover plate 16 is coplanar with the side of the splicing unit 1. By setting the cover plate 16, the connection structure of various fasteners can be hidden inside the outer frame.

[0024] To increase the structural strength of the outer frame, the splicing unit 1 and the cover plate 16 are configured with a concave-convex structure extending along their length. The splicing unit 1 is provided with a reinforcing plate 17 connecting its inner wall. Preferably, the reinforcing plate 17 connects the front and rear side walls and the inner side wall of the splicing unit 1. The concave-convex structure can improve the rigidity of the splicing unit 1 and the cover plate 16 themselves, and the internal reinforcing plate 17 further strengthens the unit structure.

[0025] The aforementioned connecting seat 12 has a trapezoidal block structure. Its bottom is fitted into the positioning groove 18 on the rear side of the first splicing end 2 and the second splicing end 3 and is fastened by fasteners. Its top is provided with a connecting groove, and a cross bracket 19 is fixed within the connecting grooves of the four connecting seats 12. The intersection of the cross brackets 19 forms the mounting point of the motor 20. This design achieves integration of the structural connecting component and the functional mounting base. The cross brackets 19 are fixed to the four reinforced corners, providing a stable and centered mounting platform for the motor 20, simplifying the overall assembly.

[0026] The above embodiments are merely preferred embodiments of the present utility model and are not intended to limit the scope of protection of the present utility model. Therefore, all equivalent changes made to the structure, shape, and principle of the present utility model should be covered within the scope of protection of the present utility model.

Claims

1. A splicing frame for a negative pressure fan, characterized in that, The outer frame consists of four identical splicing units (1) spliced ​​together. Each splicing unit (1) corresponds to one side of the outer frame and is spliced ​​together at the corner. The two ends of the splicing unit (1) are respectively provided with a first splicing end (2) and a second splicing end (3). The first splicing end (2) includes a first splicing inclined surface (4), and a splicing groove (5) is provided on the first splicing inclined surface (4). The first splicing end (2) extends along the edge of the outer frame to form an extension (6), and a plurality of insertion grooves (7) perpendicular to the edge of the outer frame are provided on the extension (6). The second splicing end (3) includes a second splicing slope (8), on which a splicing protrusion (9) is provided, and a notch (10) is provided at the position corresponding to the edge of the outer frame of the second splicing end (3), and a plug-in piece (11) is provided in the notch (10). The splicing structure of adjacent splicing units (1) is as follows: the first splicing slope (4) and the second splicing slope (8) are matched and spliced, the extension (6) and the notch (10) are matched and spliced, and the insertion groove (7) and the insertion piece (11) are matched and spliced; the first splicing end (2) and the second splicing end (3) are fastened together by the connecting seat (12) located on the rear side of the outer frame.

2. The splicing frame of a negative pressure fan according to claim 1, characterized in that, The adjacent first splicing end (2) and the second splicing end (3) are fixedly connected by several fasteners, and the adjacent first splicing inclined surface (4) and the second splicing inclined surface (8) are fixedly connected by several fasteners.

3. The splicing frame of the negative pressure fan according to claim 2, characterized in that, The first splicing end (2), the second splicing end (3), the first splicing inclined surface (4) and the second splicing inclined surface (8) are provided with connecting plates (13), connecting holes (14) or connecting posts (15) that cooperate with fasteners.

4. The splicing frame of a negative pressure fan according to claim 1, characterized in that, Both the first splicing slope (4) and the second splicing slope (8) are inclined slopes of 45°.

5. The splicing frame of a negative pressure fan according to claim 4, characterized in that, Both the splicing groove (5) and the splicing protrusion (9) are trapezoidal structures, and their cross-sectional areas gradually decrease in the direction away from the splicing slope. The base angles of the trapezoids are all 45°.

6. The splicing frame of a negative pressure fan according to claim 1, characterized in that, The splicing unit (1) has a hollow structure, and a cover plate (16) is embedded in the splicing unit (1) to close its inner cavity. The cover plate (16) is fastened to the splicing unit (1).

7. The splicing frame of a negative pressure fan according to claim 6, characterized in that, The splicing unit (1) and the cover plate (16) are configured with a concave-convex structure extending along their length direction, and the splicing unit (1) is provided with a reinforcing plate (17) connecting its inner wall.

8. The splicing frame of a negative pressure fan according to claim 1, characterized in that, The connecting seat (12) is a trapezoidal block structure. Its bottom is fitted into the positioning groove (18) on the rear side of the first splicing end (2) and the second splicing end (3) and is fastened by fasteners. Its top is provided with a connecting groove. A cross bracket (19) is fixed in the connecting groove of the four connecting seats (12). The intersection of the cross bracket (19) forms the mounting point of the motor (20).

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