CN217783838U - Motor shaft and impeller assembly using same - Google Patents
Motor shaft and impeller assembly using same Download PDFInfo
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- CN217783838U CN217783838U CN202221829641.4U CN202221829641U CN217783838U CN 217783838 U CN217783838 U CN 217783838U CN 202221829641 U CN202221829641 U CN 202221829641U CN 217783838 U CN217783838 U CN 217783838U
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- motor shaft
- impeller
- positioning guide
- impeller assembly
- cylindrical body
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Abstract
The utility model discloses a motor shaft and use impeller subassembly of this motor shaft, include: the cylindrical body, the positioning guide part formed at one axial end of the cylindrical body and the knurling part formed on the cylindrical body and close to the positioning guide part; wherein the annular knurl portion includes a plurality of draw-in grooves that are equipped with along the circumferencial direction interval on the lateral wall of column body. The utility model discloses can reduce the risk of impeller fracture, increase the power of drawing of motor shaft and impeller, can reduce the energy consumption simultaneously.
Description
Technical Field
The utility model relates to the technical field of electric motor, especially, relate to a motor shaft and use impeller subassembly of this motor shaft.
Background
The assembling methods of the impeller and the motor shaft in the impeller assembly commonly used in the prior art include the following two methods:
firstly, referring to fig. 1, a motor shaft and an impeller are connected through hot riveting;
under the above-mentioned assembly mode, the use is the reticulation annular knurl on the motor shaft, draws between impeller and the motor shaft to take off power less. The surface roughness of the reticulate pattern knurls is high, and the impeller cracking reject ratio is high during cold riveting in an interference fit state, so that the matching part of the motor shaft and the impeller is fused together by means of a hot riveting process, and the pulling-out force between the motor shaft and the impeller is increased, so that the impeller cracking reject ratio is reduced; the method has the problems of low efficiency, high energy consumption and large equipment investment (the hot riveting machine needs to be invested).
Secondly, as shown in fig. 2, a metal shaft sleeve is arranged in the impeller, and a motor shaft is connected with the metal shaft sleeve, so that the impeller and the motor shaft are connected together;
under the above-mentioned assembly mode, need increase the power of drawing off between the two with the help of the metal axle sleeve, there are the processing technology complicacy and processing cost height to the poor problem of axiality (impeller and axle sleeve need mould plastics earlier integratively, then with the impeller riveting together).
In summary, the two assembling methods commonly adopted in the prior art are difficult to combine the problems of low processing cost and improved structural stability.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a first purpose provides a motor shaft to the solution is in order to optimize motor shaft and impeller assembly structure's technical problem.
The utility model discloses a second purpose provides an impeller subassembly to the solution is with compromise the technical problem that the processing cost is low and improve structural stability.
The utility model discloses a motor shaft realizes like this:
a motor shaft, comprising: the positioning guide part is formed at one axial end of the columnar body, and the knurling part is formed on the columnar body and is close to the positioning guide part; wherein
The knurling portion includes a plurality of draw-in grooves that are equipped with along the circumferencial direction interval on the lateral wall of column body.
In an alternative embodiment of the present invention, each of the slots extends along an axial direction parallel to the columnar body.
In an optional embodiment of the present invention, the plurality of slots are evenly distributed on the outer sidewall of the columnar body.
In an optional embodiment of the present invention, the axial length of the positioning guide part is 1-4 mm.
In an alternative embodiment of the present invention, the knurled portion further comprises at least one barb formed on an outer sidewall of the cylindrical body; and
the hook head of the barb faces to the side away from the positioning guide part.
In an optional embodiment of the present invention, the barb is formed at a portion of the knurled portion where the clamping groove is not formed.
In an alternative embodiment of the present invention, an arc-shaped transition portion is further formed between the positioning guide portion and the knurled portion.
The utility model discloses an impeller subassembly is realized like this:
an impeller assembly comprising: the motor shaft and the impeller are in interference fit with the motor shaft; and
the impeller is provided with a middle hole matched with a motor shaft; the middle hole is fixedly connected with the motor shaft through cold riveting.
The utility model discloses optional embodiment, the mesoporous opening part is equipped with the guide structure that direction motor shaft and mesopore connect and join in marriage.
In an optional embodiment of the present invention, the guide structure is a chamfer; and
the length of the chamfer in the axial direction of the central hole is C1, and the width of the chamfer in the radial direction of the central hole is C2.
In an optional embodiment of the present invention, the axial length of the positioning guide portion on the motor shaft is h, and the total length of the motor shaft from the positioning guide portion to the end of the knurled portion away from the positioning guide portion is L2;
the axial length of the mesopore is L1; then
0.9≤(L1-C1)/(L2-h)≤1.2。
By adopting the technical scheme, the utility model discloses following beneficial effect has: the utility model discloses a motor shaft and use impeller subassembly of this motor shaft, when making motor shaft and impeller interference fit through the many draw-in grooves that are equipped with in the annular knurl portion of motor shaft, adopt the mode of cold riveting, can increase impeller deformation space, reduce the risk of impeller fracture, increase the power of drawing off of motor shaft and impeller, can reduce the energy consumption simultaneously; furthermore, the coaxiality of the motor shaft and the impeller can be increased by forming the positioning guide part on the motor shaft.
In addition, through the barb that is formed at the annular knurl portion of motor shaft, can make the pulling-out force increase between impeller and the motor shaft, prevent to drop.
Drawings
FIG. 1 is a schematic structural view of a prior art impeller assembly formed by a first assembly method;
FIG. 2 is a schematic structural view of a prior art impeller assembly formed by a second assembly method;
fig. 3 is a schematic structural view of a motor shaft according to the present invention;
FIG. 4 is a sectional view taken along line H of FIG. 3;
FIG. 5 is an enlarged view of the portion B of FIG. 3;
FIG. 6 is an enlarged view of section C of FIG. 3;
fig. 7 is a schematic structural view of a knurled part of a motor shaft according to an alternative embodiment of the present invention;
fig. 8 is a schematic structural view of an impeller assembly of the present invention;
fig. 9 is a schematic perspective view of an impeller of the impeller assembly of the present invention;
fig. 10 is a schematic cross-sectional view of an impeller of the impeller assembly of the present invention;
FIG. 11 is an enlarged view of section I of FIG. 10;
figure 12 is a schematic view of the fillet R on the impeller of the impeller assembly of the present invention.
In the figure: impeller 1, mesopore 11, chamfer 12, motor shaft 2, reticulation annular knurl 21, metal axle sleeve 3, location guide part 22, knurling portion 23, draw-in groove 24, transition portion 25, barb 26.
Detailed Description
In order that the present invention may be more readily and clearly understood, the following detailed description of the present invention is provided in connection with the accompanying drawings.
Example 1:
referring to fig. 3 to 7, the present embodiment provides a motor shaft, including: the positioning guide part 22 is formed on one axial end of the columnar body, and the knurled part 23 is formed on the columnar body and is arranged close to the positioning guide part 22.
Next, an alternative embodiment is illustrated in connection with the accompanying drawings, first of all the positioning guide 22:
the positioning guide part 22 achieves the effects of realizing automatic production between the motor shaft 2 and the impeller 1 during assembly and achieving accurate positioning. The positioning guide 22 as a whole has a substantially truncated cone-shaped configuration, and the outer diameter of the positioning guide 22 is smaller than the outer diameter of the knurled section 23 as a whole, and the specific outer diameter thereof gradually increases from the end portion distant from the knurled section 23 toward the knurled section 23.
Regarding the size of the positioning guide 22, the axial length of the positioning guide 22 in the present embodiment is 1 to 4mm. The coaxiality of the motor shaft 2 and the impeller 1 can be increased by forming the positioning guide 22 on the motor shaft 2.
Further, the knurled portion 23:
the knurled portion 23 includes a plurality of notches 24 provided at intervals in the circumferential direction on the outer side wall of the columnar body. The locking groove 24 is formed by being recessed on the outer side wall of the cylindrical body.
From the viewpoint of easy forming, the groove length of the plurality of catching grooves 24 may be the same as the axial direction of the integral knurled part 23, that is, each catching groove 24 is formed extending in the axial direction of the integral knurled part 23.
The recessed depths of the plurality of slots 24 relative to the columnar body may be the same or different, and all the slots meet the use requirements of the present embodiment. Similarly, the lengths of the slots 24 may be the same or different, and all the lengths are required to meet the usage requirement of the present embodiment.
Further, in one implementation, each of the pockets 24 extends in an axial direction parallel to the cylindrical body. Also, for example, the plurality of slots 24 are uniformly distributed on the outer sidewall of the cylindrical body.
Of course, the clamping groove 24 may actually be in a non-parallel relationship with the axial direction of the cylindrical body, that is, the two situations, i.e., parallel and non-parallel, satisfy the requirement of the present embodiment.
It should be noted that, in the present embodiment, any one of the slots 24 may be a whole strip-shaped slot 24 that is connected through, or may be a multi-segment-shaped slot 24 that is distributed in a strip shape, that is, the multi-segment-shaped slots 24 together form one slot 24. The structure may also be a structure in which the whole strip-type card slot 24 and the multi-section card slot 24 are spaced apart, that is, part of the card slot 24 is a whole strip-type structure, and part of the card slot 24 is a multi-section structure. The above situations are all satisfied with the use requirement of the embodiment.
On the basis of the structure, the following structural deformation can be performed on the plurality of clamping grooves 24:
the groove length of each of the card grooves 24 is much smaller than the axial length of the knurled portion 23, that is, the axial length of the knurled portion 23 can be equal to the sum of the groove lengths of the card grooves 24. On the basis of the structure, a plurality of clamping grooves 24 can be distributed on the circumferential outer side wall of the columnar body in an array manner.
It should be noted that, for the knurled part 23 in the present embodiment, a straight-line knurled structure having a plurality of catching grooves 24 may be formed, and the straight-line knurled structure may be replaced by a stepped knurled structure, that is, the use requirement of the present embodiment is satisfied as long as the catching grooves 24 are formed on the knurled part 23.
In summary, in the present embodiment, the clamping groove 24 formed in the knurled part 23 is used to provide a deformation region of the impeller 1 when the motor shaft 2 is applied to the impeller assembly and assembled with the impeller 1, so that the risk of cracking of the impeller 1 is reduced, the pulling-out force of the motor shaft 2 and the impeller 1 is increased, and thus the distribution rule of the specific clamping groove 24 is not absolutely limited.
Example 2:
referring to fig. 3 to 6, on the basis of the motor shaft 2 of embodiment 1, the motor shaft 2 provided in this embodiment has the same general structure as that of embodiment 1, except that the knurled portion 23 of the motor shaft 2 of this embodiment further includes at least one barb 26 formed on the outer side wall of the cylindrical body, and in a case of convenient processing, the barb 26 is formed on a portion of the knurled portion 23 where the slot 24 is not provided; for example, in view of the convenience of manufacturing and shaping, the number of the barbs 26 is the same as the number of the slots 24, that is, when the slots 24 are four, the barbs 26 are also four, and each barb 26 is located between two adjacent slots 24.
More specifically, the hook head of the barb 26 faces the side facing away from the positioning guide 22. The design of the barb 26 under the structure can increase the pulling-out force between the impeller 1 and the motor shaft 2 and prevent the impeller from falling off.
Example 3:
referring to fig. 3 to 6, on the basis of the motor shaft 2 of embodiment 1 or embodiment 2, an arc-shaped transition portion 25 is further formed between the positioning guide portion 22 and the knurled portion 23 of the motor shaft 2 provided in this embodiment. The design of the transition 25 here makes it possible to reduce the undesirable risk of the impeller 1 cracking when the motor shaft 2 is applied to the impeller assembly in assembly with the impeller 1.
Example 4:
referring to fig. 8 to 12, on the basis of the motor shaft 2 provided in any one of embodiments 1 to 3, the present embodiment provides an impeller assembly, including: a motor shaft 2 and an impeller 1 which is in interference fit with the motor shaft 2 in any one of embodiments 1 to 3; the impeller 1 is provided with a middle hole 11 matched with the motor shaft 2; the middle hole 11 is fixedly connected with the motor shaft 2 through cold riveting.
On the basis of the above structure, in order to improve the alignment efficiency in the assembling process of the motor shaft 2 and the impeller 1, the opening of the middle hole 11 of the embodiment is provided with a guide structure for guiding the motor shaft 2 to be matched and connected with the middle hole 11.
As for the above-mentioned guiding structure, please refer to fig. 11, in a first alternative implementation, the guiding structure is a chamfer 12; specifically, the length of the chamfer 12 in the axial direction of the central hole 11 is C1, and the width of the chamfer 12 in the radial direction of the central hole 11 is C2. Here, C1 ≧ C2, and chamfer 12c = C1 × C2.
Furthermore, the axial length of the positioning guide 22 on the motor shaft 2 is h, and the total length of the motor shaft 2 from the positioning guide 22 to the end of the knurled part 23 away from the positioning guide 22 is L2; the axial length of the central bore 11 is L1; then (L1-C1)/(L2-h) is more than or equal to 0.9 and less than or equal to 1.2.
It should be noted here that when the transition portion 25 is formed on the motor shaft 2, L2-h is actually the total length of the corresponding knurled portion 23 and the transition portion 25. And when the motor shaft 2 is not provided with the transition part 25, but the knurled part 23 is directly connected with the positioning guide part 22, L2-h here is actually the length of the corresponding knurled part 23.
Still referring to fig. 12, in a second alternative embodiment, the guide structure is a rounded corner R, which may be a 1/4 rounded corner.
In summary, for the impeller assembly of the present embodiment, the inner wall surface of the central hole 11 of the impeller 1 is smooth, so that the heating process of the heat riveting device on the motor shaft 2 when the motor shaft 2 is assembled with the impeller 1 is eliminated, meanwhile, the waiting time generated during heating is eliminated, and the metal shaft sleeve is eliminated. Specifically, the impeller 1 and the motor shaft 2 in the embodiment form a radial interference fit, and the positioning guide part 22 and the chamfer 12 between the impeller 1 and the motor shaft 2 are designed, so that the coaxiality of the impeller 1 and the motor shaft 2 in a matched state can be adjusted during assembly, the pulling-out force is increased, the cracking reject ratio of the impeller 1 is reduced, and the reliability of products is ensured. In addition, the impeller 1 and the motor shaft 2 are pressed in place by directly using cold riveting equipment, so that the hot riveting equipment in the prior art is omitted, the advantages of capacity improvement, energy consumption reduction and production cost reduction are achieved, the coaxiality of products is higher, and the stability of the products is ensured.
The above embodiments further describe the objects, technical solutions and advantages of the present invention in detail, it should be understood that the above embodiments are only specific embodiments of the present invention, and are not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of description, and do not indicate or imply that the equipment or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrated; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which is usually placed when the product of the present invention is used, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal", "vertical", "overhang" and the like do not imply that the components are required to be absolutely horizontal or overhang, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the present disclosure, unless otherwise expressly stated or limited, the first feature may comprise both the first and second features directly contacting each other, and also may comprise the first and second features not being directly contacting each other but being in contact with each other by means of further features between them. Also, the first feature being above, on or above the second feature includes the first feature being directly above and obliquely above the second feature, or merely means that the first feature is at a higher level than the second feature. A first feature that underlies, and underlies a second feature includes a first feature that is directly under and obliquely under a second feature, or simply means that the first feature is at a lesser level than the second feature.
Claims (11)
1. A motor shaft, comprising: the positioning guide part is formed at one axial end of the columnar body, and the knurling part is formed on the columnar body and is close to the positioning guide part; wherein
The knurling portion includes a plurality of draw-in grooves that are equipped with along the circumferencial direction interval on the lateral wall of column body.
2. The motor shaft of claim 1, wherein each of the pockets extends in an axial direction parallel to the cylindrical body.
3. The motor shaft of claim 2, wherein the plurality of slots are uniformly distributed on an outer sidewall of the cylindrical body.
4. The motor shaft of claim 1, wherein the axial length of the positioning guide is 1-4 mm.
5. The motor shaft of claim 1, wherein the knurled portion further comprises at least one barb formed on an outer sidewall of the cylindrical body; and
the hook head of the barb faces to the side away from the positioning guide part.
6. The motor shaft as set forth in claim 5, wherein said barbs are formed on a portion of the knurled portion where no notch is formed.
7. The motor shaft of claim 1, wherein an arcuate transition is formed between the positioning guide and the knurled portion.
8. An impeller assembly, comprising: the motor shaft of any one of claims 1 to 7 and an impeller coupled to the motor shaft in an interference fit; and
the impeller is provided with a middle hole matched and connected with a motor shaft; the middle hole is fixedly connected with the motor shaft through cold riveting.
9. The impeller assembly of claim 8, wherein a guide structure for guiding the motor shaft to be matched with the central hole is arranged at the opening of the central hole.
10. The impeller assembly of claim 9, wherein the guide structure is a chamfer; and
the length of the chamfer in the axial direction of the central hole is C1, and the width of the chamfer in the radial direction of the central hole is C2.
11. The impeller assembly of claim 10, wherein the axial length of the positioning guide on the motor shaft is h, and the total length of the motor shaft extending from the positioning guide to the end of the knurled portion facing away from the positioning guide is L2;
the axial length of the middle hole is L1; then
0.9≤(L1-C1)/(L2-h)≤1.2。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221829641.4U CN217783838U (en) | 2022-07-15 | 2022-07-15 | Motor shaft and impeller assembly using same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221829641.4U CN217783838U (en) | 2022-07-15 | 2022-07-15 | Motor shaft and impeller assembly using same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217783838U true CN217783838U (en) | 2022-11-11 |
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ID=83939481
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221829641.4U Active CN217783838U (en) | 2022-07-15 | 2022-07-15 | Motor shaft and impeller assembly using same |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217783838U (en) |
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2022
- 2022-07-15 CN CN202221829641.4U patent/CN217783838U/en active Active
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