Connecting structure suitable for installation of multi-model fan motors

Abstract

The utility model discloses a connecting structure suitable for installation of multi-model fan motors, which comprises a driving shaft, an impeller and a positioning cover, and the impeller is installed at one end of the driving shaft; a key groove is formed in the driving shaft and penetrates through the tail end of the driving shaft, the impeller comprises a hub, a mounting hole penetrates through the axis of the hub, and protruding strips are arranged on the inner wall of the mounting hole and slide in the key groove. The positioning cover is sleeved at the tail end of the driving shaft, and the axial fastener locks the positioning cover at the tail end of the driving shaft, so that the hub is clamped between the positioning cover and a shaft shoulder of the driving shaft; a key groove is formed in the tail end of the driving shaft in a penetrating mode, and the protruding strip slides in the key groove along the axis of the driving shaft. The axial fastener is in threaded fit with the driving shaft, so that the hub is jacked and pressed to a shaft shoulder of the driving shaft along the axis of the driving shaft by the positioning cover; the positioning cover, the impeller and the driving shaft are tightly connected, so that the impellers with different hub widths can be mounted and tested; the pre-tightening springs and the pre-tightening force compensation holes enable the impellers with different hub lengths to have the same pre-tightening force when the impellers are installed on the driving shaft.

Description

Technical Field

[0001] The utility model belongs to the field of motor manufacturing, and more specifically belongs to a fan installation and connection structure Background Art

[0002] During the research and development of motor fans, the installation sizes of different models of fans vary. For example, the lengths of the installation holes are different. The installation holes of large hubs are relatively long. Therefore, during the existing research and development of fan motors, different models of fans can only be installed on different rotating shafts, resulting in an increase in research and development costs and complicated research and development steps. Even if fans with different installation sizes are installed on the same rotating shaft, different pre-tightening forces will be caused due to different installation sizes, resulting in inconsistent variables in the research and development experiments and inaccurate experimental results Summary of the Invention

[0003] Object of the Invention: In order to overcome the deficiencies in the prior art, the utility model provides a connection structure suitable for the installation of multi-model fan motors, which has a simple structure and can be used for the installation of various models of fans. It provides a solution for conveniently replacing the fan model during the research and development of fan motors, saves research and development time during the fan research and development process, optimizes the research and development process, thereby reducing the research and development cost, and making the pre-tightening forces of fans with different installation sizes the same

[0004] Technical Solution: To achieve the above object, a connection structure suitable for the installation of multi-model fan motors of the utility model includes a drive shaft, an impeller, and a positioning cover. The impeller is installed at one end of the drive shaft; a keyway is provided on the drive shaft, and the keyway penetrates through the end of the drive shaft. The impeller includes a hub, and there is a through installation hole on the axis of the hub. A convex strip is provided on the inner wall of the installation hole. When the installation hole of the impeller is sleeved on the drive shaft, the convex strip slides in the keyway; the positioning cover is sleeved on the end of the drive shaft, and the positioning cover is locked on the end of the drive shaft through an axial fastener, so that the hub is clamped between the positioning cover and the shaft shoulder of the drive shaft

[0005] Further, the positioning cover is of a barrel-shaped structure, and an end wall is provided at the outer end of the positioning cover, and an adjustment chamber is formed between the end wall and the end face of the drive shaft

[0006] Further, a chamfer is provided at one end of the convex strip close to the shaft shoulder of the drive shaft, and the convex strip is integrally formed on the hole wall of the installation hole

[0007] Further, a threaded hole is also provided on the drive shaft, and the threaded hole is opened at the center of the end face of the drive shaft. The axial fastener locks the positioning cover on the drive shaft through thread cooperation with the threaded hole

[0008] Further, a connection hole penetrates through the end wall, and the connection hole is coaxially arranged with the threaded hole. The axial fastener passes through the connection hole and performs thread cooperation with the threaded hole

[0009] Furthermore, a plurality of pre-tightening springs arranged in a circumferential array and a plurality of pre-tightening force compensation holes corresponding to the pre-tightening springs and arranged in a circumferential array on the end face of the drive shaft are provided in the adjustment chamber; when the positioning cover is locked to the end of the drive shaft through an axial fastener, each pre-tightening spring is inserted into the corresponding pre-tightening force compensation hole; one end of the pre-tightening spring is fixedly connected to the end face of the inner cavity of the positioning cover, and a plurality of pre-tightening force compensation washers are stacked axially in each pre-tightening force compensation hole.

[0010] Furthermore, a process hole is provided at the center of the axis of each pre-tightening force compensation washer.

[0011] Beneficial effects: A connection structure applicable to the installation of multi-model fan motors of the present utility model can enable the ridges on the impeller hub to slide along the axis of the drive shaft in the keyway by providing a through keyway opened at the end of the drive shaft; through the threaded fit between the axial fastener and the drive shaft, the positioning cover can press the impeller hub along the axis of the drive shaft against the shaft shoulder of the drive shaft; through the tight connection between the positioning cover, the impeller and the drive shaft, the installation test of impellers with different hub widths can be realized; through the pre-tightening spring and the pre-tightening force compensation hole, the same pre-tightening force can be achieved when impellers with different hub lengths are installed on the drive shaft. Description of the Drawings

[0012] Figure 1 is a schematic structural diagram of a connection structure applicable to the installation of multi-model fan motors of the present utility model;

[0013] Figure 2 is a schematic structural diagram of the drive shaft;

[0014] Figure 3 is a schematic structural diagram of the impeller;

[0015] Figure 4 is a sectional view of a connection structure applicable to the installation of multi-model fan motors of the present utility model;

[0016] Figure 5 is a sectional view of the second embodiment of a connection structure applicable to the installation of multi-model fan motors of the present utility model;

[0017] Figure 6 is an enlarged view of the pre-tightening spring and the pre-tightening force compensation hole. Detailed Embodiments

[0018] The present utility model will be further described below with reference to the drawings.

[0019] As shown in the attached Figures 1 to 6As shown in the figure, a connection structure suitable for the installation of multi-model fan motors of the present utility model includes a drive shaft 1, an impeller 2, and a positioning cover 3. The impeller 2 is installed at one end of the drive shaft 1; as Figure 2 shown, a keyway 11 is provided on the drive shaft 1. The keyway 11 penetrates through the end of the drive shaft 1. The center of the arc surface of the keyway 11 is tangent to the drive shaft shoulder 13 of the drive shaft 1. The end shaft diameter of the drive shaft 1 is the minimum shaft diameter of the drive shaft 1; as Figure 3 shown, the impeller 2 includes a hub 21. There is a through installation hole 24 at the axis of the hub 21. A rib 23 is provided on the inner wall of the installation hole 24; as Figure 4 shown, when the installation hole 24 of the impeller 2 is sleeved on the drive shaft 1, the rib 23 slides in the keyway 11. The positioning cover 3 is sleeved on the end of the drive shaft 1; the positioning cover 3 is locked on the end of the drive shaft 1 by an axial fastener 4, so that the hub 21 is clamped between the positioning cover 3 and the drive shaft shoulder 13.

[0020] As Figure 3 shown, a chamfer 25 is provided at one end of the rib 23 on the hub 21 close to the drive shaft shoulder 13. The inclined surface of the chamfer 25 can make the rib 23 be more easily pushed into the keyway 11, and the rib 23 is integrally formed on the inner wall of the installation hole 24 along the length direction of the hub 21; the length of the hub 21 is less than the length of the keyway 11. The width of the rib 23 is the same as the width of the keyway 11. The inner wall radius of the installation hole 24 of the hub 21 is the same as the end shaft diameter of the drive shaft 1; as Figure 3 shown, the impeller 2 further includes a plurality of fan blades 22. The plurality of fan blades 22 are integrally formed on the surface of the hub 21 in a circumferential array, ensuring the stability of the impeller 2 when rotating around its own axis driven by the drive shaft 1.

[0021] As Figure 2 shown, a threaded hole 14 is further provided on the drive shaft 1. The threaded hole 14 is opened at the center of the drive shaft end face 12 of the drive shaft 1. A chamfer is provided at the outermost end of the threaded hole 14. The chamfered inclined surface guides the axial fastener 4 during the process of the axial fastener 4 entering the threaded hole 14. The axial fastener 4 locks the positioning cover 3 on the drive shaft 1 through the threaded fit with the threaded hole 14.

[0022] As Figure 4As shown in the figure, the positioning cover 3 has a barrel-shaped structure. The inner wall radius of the positioning cover 3 is the same as the end radius of the drive shaft 1. An end wall 32 is provided at the outer end of the positioning cover 3. A connection hole 31 penetrates through the end wall 32. The connection hole 31 is coaxially arranged with the threaded hole 14. The diameter of the connection hole 31 is larger than the diameter of the axial fastener 4. The diameter of the axial fastener 4 is the same as the diameter of the threaded hole 14. Such a setting can make it easier for the axial fastener 4 to pass through the connection hole 31 and engage in threaded cooperation with the threaded hole 14. When the axial fastener 4 locks the positioning cover 3 onto the drive shaft 1 through threaded cooperation with the threaded hole 14, an adjustment chamber 5 is formed between the end wall 32 and the end face 12 of the drive shaft. When the length of the keyway 11 remains unchanged, the longer the length of the hub 21, the larger the space of the adjustment chamber 5; the shorter the length of the hub 21, the smaller the space of the adjustment chamber 5. Since the length of the hub 21 is less than the length of the keyway 11, the positioning cover 3 can press the impeller 2 against the shaft shoulder 13 of the drive shaft when the space of the adjustment chamber 5 is not zero, so that the installation and testing of the impeller 2 with different hub 21 lengths can be realized.

[0023] As Figure 4 shown, the axial fastener 4 includes an axial bolt 41, a flat washer 42 and a spring washer 43. The spring washer 43 and the flat washer 42 are successively sleeved on the screw of the bolt 41. The spring washer 43 is clamped between the flat washer 42 and the head of the bolt 41. When the axial fastener 4 passes through the connection hole 31 and engages in threaded cooperation with the threaded hole 14, the flat washer 42 is in close contact with the end wall 32 of the positioning cover 3. As the threaded cooperation between the axial fastener 4 and the threaded hole 14 continues, finally the positioning cover 3 pushes the end of the hub 21 away from the positioning cover 3 to the shaft shoulder 13 of the drive shaft, and makes the hub 21 of the impeller 2 in close contact with the shaft shoulder 13 of the drive shaft.

[0024] In summary, the installation steps of a connection structure suitable for the installation of multi-model fan motors of the present utility model are as follows: Step 1: Align the rib 23 on the impeller 2 with the keyway 11 on the drive shaft 1, and sleeved the impeller 2 on the end of the drive shaft 1. Step 2: Continue to push the impeller 2 so that one end of the rib 23 close to the chamfer contacts the shaft shoulder 13 of the drive shaft. Step 3: Sleeve the positioning cover 3 on the end of the drive shaft 1, and make the port of the positioning cover 3 contact the side of the hub 21 away from the shaft shoulder 13 of the drive shaft. Step 4: Pass the axial fastener 4 through the connection hole 31 on the end wall 32 of the positioning cover 3, and make the axial fastener 4 engage in threaded cooperation with the threaded hole 14 on the end face 12 of the drive shaft. Step 5: As the threaded cooperation between the axial fastener 4 and the threaded hole 14 on the end face 12 of the drive shaft intensifies, finally the positioning cover 3 presses one end of the hub 21 close to the shaft shoulder 13 of the drive shaft against the shaft shoulder 13 of the drive shaft, realizing the tight connection between the positioning cover, the impeller and the drive shaft for subsequent experiments.

[0025] In the first embodiment described above, when the connection between the impeller 2 and the drive shaft 1 relies too much on the axial fastener 4 passing through the connection hole 31 and the threaded hole 14 for threaded engagement, the positioning cover 3 forms a top thrust on the hub 21. However, as the impeller 2 rotates around its own axis driven by the drive shaft 1, the threaded engagement between the axial fastener 4 and the threaded hole 14 will inevitably become loose. This looseness will cause the impeller 2 to collide with the keyway 11 of the drive shaft 1 during rotation, resulting in abnormal noise during the rotation of the impeller 2, and more seriously, the positioning cover 3 may fall off.

[0026] To solve the above problems, an optimized design is made for the adjustment chamber 5 formed between the end wall 32 and the end face 12 of the drive shaft, resulting in the second embodiment. The specific optimization is as follows:

[0027] As Figure 5 shown, a number of preloading springs 61 arranged in a circumferential array are also provided in the adjustment chamber 5, and a number of preloading force compensation holes 62 corresponding to the preloading springs 61 and arranged in a circumferential array are opened on the end face 12 of the drive shaft; when the positioning cover 3 is locked at the end of the drive shaft 1 through the axial fastener 4, each preloading spring 61 is inserted into the corresponding preloading force compensation hole 62; as Figure 6 shown, one end of the preloading spring 61 is fixedly connected to the end wall 32 of the inner cavity of the positioning cover 3. When the axial fastener 4 passes through the connection hole 31 and the threaded hole 14 for threaded engagement, the preloading spring 61 can generate a thrust on the positioning cover 3. This thrust can make the threaded engagement between the threaded hole 14 and the axial fastener 4 tighter, thus avoiding loosening of the threaded engagement between the axial fastener 4 and the threaded hole 14, and can also make the preloading forces the same when impellers 2 with different hub 21 lengths are installed on the drive shaft 1; as Figure 6 shown, a number of preloading force compensation washers 63 are stacked axially in each preloading force compensation hole 62. There is a process hole 64 at the center of each preloading force compensation washer 63. Workers can hook the process hole 64 at the center of the preloading force compensation washer 63 with a wire with a small hook to take or place the preloading force compensation washer 63; when the length of the keyway 11 remains unchanged, the longer the hub 21 length, the larger the space of the adjustment chamber 5, and the number of preloading force compensation washers 63 stacked in each preloading force compensation hole 62 needs to be increased. The shorter the hub 21 length, the smaller the space of the adjustment chamber 5, and the number of preloading force compensation washers 63 stacked in each preloading force compensation hole 62 needs to be reduced, so as to make the thrust generated by the preloading spring 61 on the positioning cover 3 the same and ensure that the preloading forces are the same when impellers 2 with different hub 21 lengths are installed on the drive shaft 1.

[0028] The above are the preferred embodiments described in the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present utility model, several improvements and refinements can be made, and these improvements and refinements should also be regarded as within the protection scope of the present utility model.

Claims

1. A connection structure suitable for installing multiple types of fan motors, characterized in that: The invention comprises a driving shaft (1), an impeller (2) and a positioning cover (3), wherein the impeller (2) is mounted on one end of the driving shaft (1); a keyway (11) is provided on the driving shaft (1), and the keyway (11) is arranged through the end of the driving shaft (1); the impeller (2) comprises a hub (21), and a through mounting hole (24) is provided on the axis of the hub (21); a convex strip (23) is arranged on the inner wall of the mounting hole (24); when the mounting hole (24) of the impeller (2) is sleeved on the driving shaft (1), the convex strip (23) slides in the keyway (11); the positioning cover (3) is sleeved on the end of the driving shaft (1), and the positioning cover (3) is locked on the end of the driving shaft (1) by an axial fastener (4), so that the hub (21) is clamped between the positioning cover (3) and the shaft shoulder of the driving shaft (1).

2. A connection structure suitable for installing multiple types of fan motors according to claim 1, characterized in that: The positioning cover (3) is a barrel-shaped structure, an end wall (32) is provided at the outer end of the positioning cover (3), and an adjustment chamber (5) is formed between the end wall (32) and the end surface (12) of the drive shaft.

3. A connection structure suitable for installing multiple types of fan motors according to claim 1, characterized in that: A chamfer (25) is provided at one end of the convex strip (23) close to the drive shaft shoulder (13), and the convex strip (23) is integrally formed on the hole wall of the mounting hole (24).

4. The connection structure suitable for installing multiple types of fan motors according to claim 1, characterized in that: The drive shaft (1) is also provided with a threaded hole (14), the threaded hole (14) being opened at the center of the end face (12) of the drive shaft, and the axial fastener (4) locks the positioning cover (3) on the drive shaft (1) by threaded engagement with the threaded hole (14).

5. The connection structure suitable for installing multiple types of fan motors according to claim 2, characterized in that: The end wall (32) is penetrated by a connecting hole (31), the connecting hole (31) and the threaded hole (14) are coaxially arranged, and the axial fastener (4) passes through the connecting hole (31) and is threadably matched with the threaded hole (14).

6. A connection structure suitable for installing multiple types of fan motors according to claim 2, characterized in that: The regulating chamber (5) is also provided with a plurality of preload springs (61) arranged in a circumferential array, and a plurality of preload compensation holes (62) corresponding to the preload springs (61) and arranged in a circumferential array on the end surface (12) of the driving shaft; when the positioning cover (3) is locked at the end of the driving shaft (1) by the axial fastener (4), each preload spring (61) is inserted into the corresponding preload compensation hole (62); one end of the preload spring (61) is fixedly connected to the end surface of the inner cavity of the positioning cover (3), and a plurality of preload compensation gaskets (63) are stacked axially in each of the preload compensation holes (62).

7. A connection structure suitable for installing multiple types of fan motors according to claim 6, characterized in that: Each preload compensation gasket (63) has a process hole (64) at the axis center.

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