Fan blade shaft mechanism for reversing fan

Abstract

The utility model relates to a fan blade shaft mechanism for a reversing fan, and belongs to the technical field of reversing fans. The fan blade shaft mechanism comprises a shaft assembly, a fan blade assembly and a shaft fixing seat assembly, the shaft assembly comprises a fixing shaft, the inner side end of the fixing shaft is fixedly connected with the fan blade assembly, the outer side end of the fixing shaft is connected with the shaft fixing seat assembly, and a cylindrical pin is eccentrically assembled on a shaft shoulder at the outer side end of the fixing shaft. After the fan blade shaft mechanism for the reversing fan and a hydraulic oil cylinder mechanism of the reversing fan are assembled, the cylindrical pin eccentrically arranged on the fixed shaft shoulder is assembled with the moving part of the hydraulic oil cylinder to drive the fixed shaft to rotate, so that the rotating reversing of the fan blade is realized, the structure is simple and stable, and the assembly and the maintenance are convenient.

Description

Technical Field

[0001] This utility model relates to the field of commutator fan technology, specifically to a fan blade shaft mechanism for a commutator fan. Background Technology

[0002] Commutating fans are widely used in automobiles, ships, and other fields. During operation, they cool the engine system and periodically clean inhaled dust and debris. The fan's reversing direction switches between inward cooling and outward cleaning. The fan blade shaft, as the connecting mechanism between the fan blades and the power mechanism, drives the fan blades to commutate. Currently, the common drawbacks of the commutating fan blade shaft mechanisms used in hydraulic commutating fans that have been commercially available and publicly reported in China are: 1. Complex manufacturing and assembly processes, resulting in low production efficiency. 2. High frictional forces on the fixed shaft during commutation, leading to commutation failure, severe wear, and high maintenance requirements. Summary of the Invention

[0003] To address the problems in the existing technology, this utility model patent designs a fan blade shaft mechanism for a commutator fan, thereby solving the aforementioned problems existing in the existing fan blade shaft mechanism.

[0004] The technical solution adopted by this utility model is as follows: the fan blade shaft mechanism includes a shaft assembly, a fan blade assembly and a shaft fixing seat assembly. The shaft assembly includes a fixed shaft. The inner end of the fixed shaft is fixedly connected to the fan blade assembly, and the outer end is connected to the shaft fixing seat assembly. A cylindrical pin is eccentrically mounted on the shoulder of the outer end of the fixed shaft.

[0005] Furthermore, the fan blade assembly includes a fan blade, one end of which is integrally formed with a fixing block. The fixing block has a stepped hole along its axis. The inner end of the fixing shaft is inserted into the stepped hole of the fixing block and is connected and fixed by bolts.

[0006] Furthermore, the shaft fixing seat assembly includes a bearing seat, on the inner side of which tapered roller bearings and deep groove ball bearings are arranged side by side and rotatably connected to the fixed shaft.

[0007] Furthermore, a bearing spacer is provided between the tapered roller bearing and the deep groove ball bearing.

[0008] Furthermore, the deep groove ball bearing is located on the inner end of the bearing housing near the fixed shaft, and a retaining ring for the bore and a bearing sealing ring are sequentially arranged on the opposite outer side of the deep groove ball bearing.

[0009] Furthermore, dynamic balance adjustment blocks are respectively provided on both sides of the fixing block of the fan blade assembly.

[0010] Furthermore, the fixing block has a through mounting hole in a direction perpendicular to its axis, and correspondingly, the fixing shaft also has a through connecting hole in a radial direction. The connecting hole on the fixing shaft is coaxially aligned with the mounting hole on the fixing block, and a long bolt is provided to pass through and fix it.

[0011] Furthermore, the dynamic balance adjustment blocks on both sides of the fixed pressure block are respectively set at both ends of the assembly hole and fixed by long bolts.

[0012] Furthermore, a pin sleeve is rotatably fitted on the outer side of the cylindrical pin.

[0013] Compared to existing technologies, the advancements of this utility model patent in designing a fan blade shaft mechanism for a commutating fan are as follows: the fan blade shaft mechanism has a simple and practical structure, low production and assembly costs, high efficiency, and good stability; the fixed shaft is connected to the moving part of the hydraulic cylinder via a cylindrical pin mounted on its outer shoulder, which can convert the linear motion of the cylindrical pin along the X and Y axes in a plane perpendicular to its central axis into a circular motion rotating around the centerline of the fan blade fixed shaft, thus realizing the fan commutation driven by the hydraulic cylinder; a pin sleeve is fitted on the outer side of the cylindrical pin, allowing the two to slide (or roll) freely, reducing the frictional resistance experienced by the fan blade fixed shaft during commutation rotation, and also avoiding direct wear on the cylindrical pin during use, making maintenance convenient; the shaft fixing seat assembly is equipped with tapered roller bearings and deep groove ball bearings, allowing the fixed shaft to rotate by the bearings during commutation rotation, reducing rotational frictional resistance. At the same time, the tapered roller bearings can effectively prevent the centrifugal force generated by the fan blades during high-speed rotation from causing the fan blades to jump and damaging the bearings, greatly improving the service life and operational stability of the fan blade shaft mechanism. Attached Figure Description

[0014] Figure 1 This is a top view schematic diagram of the blade shaft mechanism for a commutator fan.

[0015] Figure 2 This is a front view structural diagram of the blade shaft mechanism for a commutator fan.

[0016] Figure 3 yes Figure 1 A schematic diagram of the AA-direction cross-section structure.

[0017] In the diagram, 101-shaft assembly, 201-shaft fixing seat assembly, 301-fan blade assembly, 1-fixed shaft, 2-cylindrical pin, 3-pin sleeve, 4-bearing housing, 5-bearing spacer, 6-bearing seal ring, 7-tapered roller bearing, 8-deep groove ball bearing, 9-elastic retaining ring for bore, 10-fan blade, 11-fixed pressure block, 12-dynamic balance adjustment block, 13-hexagonal head bolt A, 14-hexagonal nut, 15-hexagonal head bolt B. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. The technical solutions in the embodiments of the present invention will be clearly and completely described. The described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0019] like Figure 1 , 2 As shown in Figure 3, this utility model patent designs an embodiment of a fan blade shaft mechanism for a commutator fan. In this embodiment, the fan blade shaft mechanism includes a shaft assembly 101, a fan blade assembly 301, and a shaft fixing seat assembly 201. The fan blade assembly 301 includes a fan blade 10, and a coaxial fixing block 11 is integrally formed at one end of the fan blade 10. The fixing block 11 has a stepped hole formed along its axis that mates with the fixing shaft 1 of the shaft assembly 101, and a fixing steel ring is embedded inside the stepped hole. The fan blade 10 and the fixing block 11 are made of non-metallic materials through processes such as thermoplastic molding, and are resistant to oil corrosion, and do not lose their function in an environment of -40°C to 150°C. The fixing block 11 has an assembly hole that penetrates both sides of its center line in a direction perpendicular to its axis, and two bolt fixing holes are symmetrically located near the inner end of its stepped hole.

[0020] The shaft assembly 101 includes a fixed shaft 1. The inner end of the fixed shaft 1 is inserted into the stepped hole of the fixing block 11 of the fan blade assembly 301, and its shape is adapted to the stepped hole. Simultaneously, a through connecting hole is radially opened on the fixed shaft 1 at the position corresponding to the mounting hole of the fixing block 11. After the fixed shaft 1 is inserted into the fixing block 11, the connecting hole and the mounting hole are coaxially aligned and a long hexagonal head bolt A13 passes through it, and it is fixed by a hexagonal nut 14. At both ends of the mounting hole of the fixing block 11, dynamic balance adjustment blocks 12 are fixed by hexagonal head bolts A13 to adjust the dynamic balance of the entire fan. The dynamic balance adjustment blocks 12 are made of low-carbon steel and are rust-proofed. Hexagonal head bolts B15 and hexagonal nuts 14 are also respectively installed in the two bolt fixing holes at the inner end of the stepped hole for fixing.

[0021] An eccentric hole is provided on the shoulder of the outer end of the fixed shaft 1. A cylindrical pin 2 made of hard alloy material is fitted into the eccentric hole. The part of the cylindrical pin 2 exposed outside the eccentric hole is rotatably fitted with a pin sleeve 3 made of copper alloy material. The shaft fixing seat assembly 201 is fitted onto the fixed shaft 1. The shaft fixing seat assembly 201 includes a bearing seat 4, which is made of alloy material through machining and heat treatment processes. Tapered roller bearings 7 and deep groove ball bearings 8 are arranged side by side on its inner side and are rotatably connected to the fixed shaft 1. A bearing spacer 5 is provided between the tapered roller bearing 7 and the deep groove ball bearing 8 to separate their assembly positions. The deep groove ball bearing 8 is located on the inner side of the bearing housing 4 near the fixed shaft 1. On the opposite outer side of the deep groove ball bearing 8, there are elastic retaining rings 9 for limiting the assembly position of the deep groove ball bearing 8 and bearing sealing retaining rings 6 for sealing and blocking the outside. The bearing sealing retaining rings 6 are made of non-metallic materials through thermoplastic molding and other processes, and are resistant to oil corrosion and will not be damaged in an environment of -40°C to 150°C.

[0022] When the fan blade shaft mechanism for a commutating fan disclosed in this utility model patent is applied, the bearing seat 4 of the shaft fixing seat assembly 201 is sealed to the seat of the hydraulic cylinder mechanism of the commutating fan. The cylindrical pin 2 at the outer end of the fixed shaft 1 is fitted into the groove on the outer periphery of the movable cylinder cylinder inside the hydraulic cylinder mechanism, and the cylindrical pin 2 can slide along the groove. When the cylinder of the hydraulic cylinder mechanism is working, the cylinder cylinder begins to move, driving the cylindrical pin 2 and the cylindrical pin sleeve 3 in the groove outside the cylinder cylinder to move along the direction of movement of the cylinder cylinder, i.e., the positive (or negative) direction of the Y-axis, and the direction perpendicular to the direction of movement of the cylinder cylinder, i.e., the positive (or negative) direction of the X-axis. The cylindrical pin 2 and the cylindrical pin sleeve 3 rotate in an arc in the shoulder plane with the axis of the fixed shaft 1 as the center. The fixed shaft 1 and the fixedly connected fan blade 10 rotate coaxially with the cylindrical pin 2. The rotation angle of the fixed shaft 1 and the fan blade 10 depends on the relative movement distance of the cylinder cylinder.

[0023] The above description is merely a preferred embodiment of the present invention and should not be construed as limiting the scope of the present invention. Any simple equivalent changes and modifications made in accordance with the claims and description of the present invention shall still fall within the scope of the present invention.

Claims

1. A fan blade shaft mechanism for a commutator fan, characterized in that, The fan blade shaft mechanism includes a shaft assembly, a fan blade assembly, and a shaft fixing seat assembly. The shaft assembly includes a fixed shaft, the inner end of which is fixedly connected to the fan blade assembly, and the outer end of which is connected to the shaft fixing seat assembly. A cylindrical pin is eccentrically mounted on the shoulder of the outer end of the fixed shaft.

2. The fan blade shaft mechanism for a commutator fan according to claim 1, characterized in that, The fan blade assembly includes a fan blade, one end of which is integrally formed with a fixing block. The fixing block has a stepped hole along its axis. The inner end of the fixing shaft is inserted into the stepped hole of the fixing block and is connected and fixed by bolts.

3. The fan blade shaft mechanism for a commutating fan according to claim 1, characterized in that, The shaft fixing seat assembly includes a bearing seat, on the inner side of which tapered roller bearings and deep groove ball bearings are arranged side by side and rotatably connected to the fixed shaft.

4. The fan blade shaft mechanism for a commutating fan according to claim 3, characterized in that, A bearing spacer is provided between the tapered roller bearing and the deep groove ball bearing.

5. The fan blade shaft mechanism for a commutating fan according to claim 4, characterized in that, The deep groove ball bearing is located on the inner end of the bearing housing near the fixed shaft, and a retaining ring for the bore and a bearing sealing ring are arranged sequentially on the opposite outer side of the deep groove ball bearing.

6. The fan blade shaft mechanism for a commutating fan according to claim 5, characterized in that, Dynamic balance adjustment blocks are provided on both sides of the fixing block of the fan blade assembly.

7. The fan blade shaft mechanism for a commutating fan according to claim 6, characterized in that, The fixed pressure block has a through-hole in a direction perpendicular to its axis. Correspondingly, the fixed shaft also has a through-hole in a radial direction. The through-hole on the fixed shaft is coaxially aligned with the assembly hole on the fixed pressure block, and a long bolt passes through it for fixing.

8. The fan blade shaft mechanism for a commutating fan according to claim 7, characterized in that, The dynamic balance adjustment blocks on both sides of the fixed pressure block are respectively set at both ends of the assembly hole and fixed by long bolts.

9. A fan blade shaft mechanism for a commutating fan according to claim 1, characterized in that, A pin sleeve is rotatably fitted on the outer side of the cylindrical pin.

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