Middle shaft structure of air valve blade
By fixing the central shaft of the damper blades with a V-groove and U-groove snap-fit structure, the problems of deformation and corrosion caused by welding are solved, achieving stable installation and durability, and improving the production efficiency and service life of the damper.
Patent Information
- Application Number
- CN202520452396.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-14
- Publication Date
- 2026-02-03
- Estimated Expiration
- 2035-03-14
AI Technical Summary
The existing welding method between the central shaft and the blade of the damper is prone to deformation and corrosion, affecting sealing performance and service life, and is also inconvenient to install.
The design employs a snap-fit structure with V-groove and U-groove, where the central shaft and the fixed plate are snapped together by limiting protrusions and limiting holes, and then fixed with screws, avoiding welding and ensuring the stability and corrosion resistance of the central shaft and blades.
It avoids deformation and corrosion of the central shaft and blades, improves installation convenience and valve production efficiency, and extends service life.
Smart Images
Figure CN223868558U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of air valve technology, and in particular to a central shaft structure for an air valve blade. Background Technology
[0002] Air dampers are typically installed in internal air ducts or external ventilation ducts for air supply or exhaust, used to regulate ventilation volume and control opening and closing. Existing air damper blades come in various forms, including single-blade and multi-blade types. Generally, existing air damper blades use a single central shaft welded to the blades, with both ends of the central shaft rotated and mounted on the damper frame. Adjusting the blade angle by rotating the central shaft regulates ventilation volume and controls opening and closing. Generally, the longer the central shaft, the more difficult it is to maintain its straightness. Furthermore, the more weld points there are, the more prone it is to deformation of the central shaft or blades. These quality defects reduce the blade's sealing performance, preventing the damper from functioning effectively. Additionally, the weld between the central shaft and the blades is more susceptible to corrosion, affecting the damper's lifespan. Utility Model Content
[0003] The purpose of this utility model is to provide a central shaft structure for a wind valve blade that is fixed without welding, which can prevent deformation of the central shaft or blade, reduce the risk of corrosion, and make installation more convenient.
[0004] To achieve the above and other related objectives, this utility model provides a central shaft structure for a damper blade, comprising: a central shaft and a fixing plate; a V-shaped groove is provided in the middle of each damper blade, and a central shaft is fixedly installed at each end of the V-shaped groove; the other end of the central shaft is rotatably connected to the side plate of the damper frame; a U-shaped groove is provided in the middle of the fixing plate, and the U-shaped groove cooperates with the central shaft; the edge of the fixing plate is fixedly connected to the damper blade by a number of screws; wherein, a limiting protrusion is provided on the side wall of the central shaft that cooperates with the V-shaped groove and the U-shaped groove, and a limiting hole is provided in the U-shaped groove; one limiting protrusion is engaged with the bottom of the V-shaped groove, and the other limiting protrusion is engaged with the limiting hole.
[0005] In one example of the central shaft structure of the wind valve blade of this utility model, the side plate of the wind valve frame is provided with a shaft hole, a bushing is provided in the shaft hole, and the central shaft is rotatably installed in the bushing.
[0006] In one example of the central shaft structure of the wind valve blade of this utility model, the bushing and the shaft hole are snap-fitted together, and the inner diameter of the bushing matches the diameter of the central shaft.
[0007] In one example of the central shaft structure of the wind valve blade of this utility model, the bottom of the V-shaped groove is provided with a groove that cooperates with the limiting protrusion.
[0008] In one example of the central shaft structure of the wind valve blade of this utility model, the opening of the V-shaped groove and the opening of the U-shaped groove are arranged opposite to each other.
[0009] In one example of the central shaft structure of the wind valve blade of this utility model, the fixing plate is rectangular or square.
[0010] In one example of the central shaft structure of the wind valve blade of this utility model, the four corners of the fixing plate are respectively fixedly connected to the wind valve blade by a screw.
[0011] In one example of the central shaft structure of the wind valve blade of this utility model, the two limiting protrusions are symmetrically arranged on the side wall of the central shaft about the axis of the central shaft.
[0012] In one example of the central axis structure of the wind valve blade of this utility model, the limiting protrusion is elongated and is arranged along the extension direction of the central axis. The end face of the limiting protrusion away from the central axis is arc-shaped or flat. The shape of the limiting hole matches the shape of the limiting protrusion.
[0013] In one example of the central shaft structure of the wind valve blade of this utility model, the thickness of the limiting protrusion is 2-5mm.
[0014] The central shaft structure of this utility model's damper blade utilizes the V-groove on the damper blade and the U-groove on the fixing plate to mount the central shaft at both ends of the damper blade. Two limiting protrusions on the central shaft engage with limiting holes on the V-groove and U-groove respectively, thus fixing the central shaft to both ends of the damper blade. The fixing plate is then fixed to the damper blade with screws. This utility model avoids welding to fix the central shaft and damper blade, preventing deformation of the central shaft or blades, reducing the risk of corrosion, and making the installation of the damper blade and central shaft more convenient, thereby improving the production efficiency of the damper. Attached Figure Description
[0015] Figure 1 This is a schematic diagram of the overall structure of one embodiment of the central shaft structure of the wind valve blade of this utility model;
[0016] Figure 2 This is a partial structural diagram of an embodiment of the central shaft structure of the wind valve blade of this utility model;
[0017] Figure 3 This is a schematic diagram of the central shaft structure of one embodiment of the central shaft structure of the wind valve blade of this utility model;
[0018] Figure 4 This is a schematic diagram of the bushing structure in one embodiment of the central shaft structure of the wind valve blade of this utility model;
[0019] Figure 5This is a schematic diagram of the fixing plate in one embodiment of the central shaft structure of the wind valve blade of this utility model.
[0020] Component designation:
[0021] 100 air valve blades
[0022] 110 V-groove
[0023] 120 trench
[0024] 200 center axis
[0025] 210 Limiting protrusion
[0026] 220 bushing
[0027] 300 Fixed Plate
[0028] 310 U-shaped channel
[0029] 311 Limiting Hole
[0030] 320 screws
[0031] 400 air valve frame Detailed Implementation
[0032] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. It should also be understood that the terminology used in the embodiments of this utility model is for describing specific implementation schemes and not for limiting the scope of protection of this utility model. Test methods in the following embodiments that do not specify specific conditions are generally performed under conventional conditions or according to the conditions recommended by the respective manufacturers.
[0033] When numerical ranges are given in the embodiments, it should be understood that, unless otherwise specified in this invention, both endpoints of each numerical range and any value between the two endpoints may be selected. Unless otherwise defined, all technical and scientific terms used in this invention, as well as the prior art known to those skilled in the art and the description of this invention, may be implemented using any prior art methods, equipment, and materials similar to or equivalent to those in the embodiments of this invention.
[0034] Please see Figures 1 to 5This utility model provides a central shaft structure for a damper blade, comprising: a central shaft 200 and a fixing plate 300. Each damper blade 100 has a V-shaped groove 110 in its middle, and a central shaft 200 is fixedly installed at each end of the V-shaped groove 110. The other end of the central shaft 200 is rotatably connected to the side plate of the damper frame 400. The fixing plate 300 has a U-shaped groove 310 in its middle, which cooperates with the central shaft 200. The edge of the fixing plate 300 is fixedly connected to the damper blade 100 by a plurality of screws 320. The central shaft 200 has a limiting protrusion 210 on its side wall that mates with the V-groove 110 and the U-groove 310. The U-groove 310 has a limiting hole 311. One limiting protrusion 210 engages with the bottom of the V-groove 110, and the other limiting protrusion 210 engages with the limiting hole 311.
[0035] When installing the damper blade 100, first place the damper blade 100 in its mounting position within the damper frame 400. Then, insert one end of a central shaft 200 into the shaft hole on the side plate of the damper frame 400 and engage the central shaft 200 with the V-groove 110, ensuring that a limiting protrusion 210 on the central shaft 200 engages with the bottom of the V-groove 110. Next, cover the central shaft 200 with a fixing plate 300, ensuring that a U-groove 310 engages with the central shaft 200 and that another limiting protrusion 210 on the central shaft 200 engages with the limiting hole 311. Finally, use screws 320 to secure the fixing plate 300 to the damper blade 100. Repeat the above steps to install a central shaft 200 at the other end of the damper blade 100, thus completing the installation of one damper blade 100. This invention does not use welding to fix the central shaft 200 and the damper blade 100, which can prevent deformation of the central shaft 200 or the damper blade 100 and is less prone to corrosion. It also makes the installation of the damper blade 100 and the central shaft 200 more convenient and improves the production efficiency of the damper.
[0036] Please see Figures 2 to 4 In one example of the central shaft structure of the damper blade of this utility model, the damper frame 400 has a shaft hole on its side plate, and a bushing 220 is provided in the shaft hole. The central shaft 200 is rotatably installed in the bushing 220. The bushing 220 is snap-fitted to the shaft hole, and the inner diameter of the bushing 220 matches the diameter of the central shaft 200. The bushing 220 facilitates the opening of the shaft hole and also prevents friction between the central shaft 200 and the side plate, thus avoiding wear on the damper frame 400. The bushing 220 is also easy to replace after wear.
[0037] Please see Figure 1 and Figure 2In one example of the central shaft structure of the wind valve blade of this utility model, the bottom of the V-groove 110 is provided with a groove 120 that cooperates with the limiting protrusion 210. The opening of the V-groove 110 is opposite to the opening of the U-groove 310. The groove 120 is provided at the bottom of the V-groove 110 along the extending direction of the V-groove 110, and the groove 120 is engaged with the limiting protrusion 210.
[0038] In one example of the central shaft structure of the damper blade of this utility model, the fixing plate 300 is rectangular or square. The four corners of the fixing plate 300 are respectively fixedly connected to the damper blade 100 by a screw 320.
[0039] Please see Figure 3 In one example of the central shaft structure of the damper blade of this utility model, two limiting protrusions 210 are symmetrically arranged on the side wall of the central shaft 200 about its axis. The limiting protrusions 210 are elongated strips, arranged along the extending direction of the central shaft 200, and the end face of the limiting protrusion 210 away from the central shaft 200 is arc-shaped or flat. The shape of the limiting hole 311 matches the shape of the limiting protrusion 210. The length and width of the limiting protrusions 210 can be set according to actual needs, to ensure stable fixation of the central shaft 200. The limiting protrusions 210 can be prepared by stamping or casting.
[0040] In one example of the central shaft structure of the damper blade of this utility model, the thickness of the limiting protrusion 210 is 2-5 mm. The thickness of the limiting protrusion 210 can be adjusted according to the diameter of the central shaft 200.
[0041] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.
Claims
1. A central shaft structure for a damper blade, characterized in that, include: A central shaft is provided, and a V-shaped groove is provided in the middle of each air valve blade. A central shaft is fixedly installed at each end of the V-shaped groove, and the other end of the central shaft is rotatably connected to the side plate of the air valve frame. A fixing plate is provided with a U-shaped groove in the middle, which cooperates with the central shaft, and the edge of the fixing plate is fixedly connected to the wind valve blade by a number of screws; The central shaft has a limiting protrusion on its side wall that mates with the V-groove and the U-groove, and a limiting hole is provided in the U-groove. One of the limiting protrusions engages with the bottom of the V-groove, and the other limiting protrusion engages with the limiting hole.
2. The central shaft structure of the damper blade as described in claim 1, characterized in that, The side plate of the air valve frame is provided with a shaft hole, and a bushing is provided in the shaft hole. The central shaft is rotatably installed in the bushing.
3. The central shaft structure of the damper blade as described in claim 2, characterized in that, The bushing is snapped into the shaft hole, and the inner diameter of the bushing matches the diameter of the central shaft.
4. The central shaft structure of the damper blade as described in claim 1, characterized in that, The bottom of the V-groove is provided with a groove that matches the limiting protrusion.
5. The central shaft structure of the damper blade as described in claim 1, characterized in that, The opening of the V-groove is positioned opposite to the opening of the U-groove.
6. The central shaft structure of the damper blade as described in claim 1, characterized in that, The fixing plate is rectangular or square.
7. The central shaft structure of the damper blade as described in claim 6, characterized in that, The four corners of the fixing plate are respectively fixedly connected to the air valve blade by a screw.
8. The central shaft structure of the damper blade as described in claim 1, characterized in that, The two limiting protrusions are symmetrically arranged on the side wall of the central axis about the axis of the central axis.
9. The central shaft structure of the damper blade as described in claim 8, characterized in that, The limiting protrusion is elongated and is arranged along the extension direction of the central axis. The end face of the limiting protrusion away from the central axis is arc-shaped or flat. The shape of the limiting hole matches the shape of the limiting protrusion.
10. The central shaft structure of the damper blade as described in claim 9, characterized in that, The thickness of the limiting protrusion is 2-5 mm.