Blower assembly and method
Some embodiments of the present invention provide a blower assembly having a housing adapted to receive a fan therein, a bracket coupled to the housing, a motor supported on the bracket and drivably coupled to the fan, a resilient bushing coupled to the housing and positioned to support the bracket thereon, and a deformable fastener coupling the resilient bushing to the housing. The deformable fastener can include a first retaining portion and a second retaining portion. In some embodiments, the resilient bushing and at least a portion of the housing are secured between the first retaining portion and the second retaining portion.
Many different blower assemblies exist and are well known in the art. A typical centrifugal blower assembly includes a scroll-shaped housing having a fan enclosed therein, and a motor assembly mounted to the housing and drivably coupled to the fan. In many cases, the housing includes a centralized intake opening to allow the fan to draw air from outside the housing, and a discharge opening substantially transverse to the intake opening and from which pressurized air is discharged by the fan.
The motor assembly typically includes an electric motor mounted to the housing. A bracket can support the motor such that the motor's driveshaft extends through an opening in the housing to drive the fan. The driveshaft is coupled to the fan using conventional methods such that torque from the driveshaft is transmitted to the fan to drive the fan.
The electric motor is controllable to drive the fan at one or more speeds. As such, any imbalance in the fan or misalignment between the driveshaft and the fan can cause vibration to be transmitted through the motor assembly to the housing. If the housing is rigidly mounted to its supporting structure, the vibration can be further transmitted to the supporting structure and beyond. Vibration of the fan assembly or its supporting structure can cause noise, premature failure, and other problems (common in some conventional fan assemblies).
To help dampen fan assembly vibration (in those embodiments where such dampening is desired), the motor assembly can be isolated from the housing by one or more resilient bushings. Typically, the resilient bushing is fastened to the housing, and the bracket is independently coupled to the resilient bushing to isolate the bracket from the housing. Conventional multi-piece fasteners (e.g., a bolt, washer, and nut) are typically used to fasten the resilient bushings to the housing. However, such conventional manners of attachment can loosen over an extended period of time, which can lead to damage and/or failure of the blower assembly. Also, the head portion of many conventional fasteners typically extends too far into the housing, such that it can physically interfere with the fan or disrupt the airflow in the housing generated by the fan.
Other fasteners, such as self-clinching enlarged head studs or capacitor discharge (CD) welded studs, can be employed to help decrease the interference and disruption inside the housing caused by other fasteners. However, many such alternative fastening elements are difficult to install and secure and/or can add significant cost in the assembly process. Also, in many cases the resilient bushing is still captured by a washer and nut, which can loosen from the stud over an extended period of time.
Other issues important to blower design include blower manufacturability and the costs associated with blower assembly. Blower designs that take these issues into account while providing good fan performance are always welcome in the art.
SUMMARY OF THE INVENTIONIn some embodiments of the present invention, a blower assembly is provided, and has a housing adapted to receive a fan therein, a bracket coupled to the housing, a motor supported on the bracket and drivably coupled to the fan, a resilient bushing coupled to the housing and positioned to support the bracket thereon, and a one-piece fastener coupling the resilient bushing to the housing, wherein the one-piece fastener includes a first retaining portion and a second retaining portion, and wherein the resilient bushing and at least a portion of the housing are secured between the first retaining portion and the second retaining portion.
Some embodiments of the present invention provide a blower assembly comprising a housing adapted to receive a fan, a bracket coupled to the housing, a motor supported on the bracket and drivably coupled to the fan, a resilient bushing coupled to the housing and positioned to support the bracket, a permanently deformable fastener coupling the resilient bushing to the housing, wherein the permanently deformable fastener includes a head and a deformable shank extending from the head, and wherein the resilient bushing and at least a portion of the housing are secured between the head and a deformed end portion of the shank.
In another aspect of the present invention, a blower assembly is provided that has a housing adapted to receive a fan therein, a bracket coupled to the housing, a motor supported on the bracket and drivably coupled to the fan, a resilient bushing coupled to the housing and positioned to support the bracket, and a permanently deformable fastener coupling the resilient bushing to the housing, wherein the permanently deformable fastener includes a head and a deformable shank protruding from the head, and where at least a portion of the shank is deformed to secure the resilient bushing between the housing and the head.
In yet another aspect of the present invention, a method of securing a motor assembly to a fan housing is provided, and comprises providing a resilient bushing, positioning the resilient bushing at a mounting portion of the housing, providing a permanently-deformable fastener having a head and a deformable shank extending from the head, inserting the permanently-deformable fastener through the resilient bushing and the mounting portion of the housing, and deforming an end portion of the shank such that the resilient bushing and the mounting portion of the housing is secured between the head and the deformed end portion of the shank.
Other features and aspects of the present invention will become apparent to those skilled in the art upon review of the following detailed description, claims and drawings.
BRIEF DESCRIPTION OF THE DRAWINGSIn the drawings, wherein like reference numerals indicate like parts:
Before any features of the invention are explained in detail, it is to be understood that the invention is not limited in its application to the details of construction and the arrangements of supports set forth in the following description or illustrated in the drawings. The invention is capable of other embodiments and of being practiced or of being carried out in various ways. Also, it is to be understood that the phraseology and terminology used herein is for the purpose of description and should not be regarded as limiting.
DETAILED DESCRIPTION With reference to
With reference again to the exemplary illustrated embodiment, the motor 22 includes a driveshaft (not shown) extending therefrom and a cooling fan 34 coupled for co-rotation with the driveshaft. Upon activation of the motor 22 and rotation of the driveshaft, the cooling fan 34 provides a cooling airflow past the motor 22. In other embodiments, the driveshaft is only coupled to a fan within the housing 18 (i.e., no cooling fan 34 is employed).
The motor 22 is supported by the bracket 26 relative to the housing 18 such that the driveshaft extends through an opening (not shown) in the housing 18. The driveshaft is coupled to a fan 38 inside the housing 18 using conventional methods such that torque from the driveshaft is transmitted to the fan 38 in order to drive the fan 38.
With reference to
The resilient bushings 30 can be made of any material or combination of materials, including without limitation rubber, plastic, urethane, and any other vibration dampening material. In other embodiments, the bushing 30 need not necessarily be selected for vibration dampening properties, such as bushings 30 manufactured of steel, aluminum, brass, and other metals, ceramics, composite materials, and the like, in which case the bushing 30 can even be an integral part of the bracket 26 and can have any other shape desired. In such cases, the bushings 30 can be employed for securing the bracket 26 in a desired location with respect to the housing 18, can have electrically insulative or conductive properties, can have heat insulative or conductive properties, and the like.
A one-piece, permanently deformable fastener 58 is insertable through the aperture 46 of the resilient bushing 30 and an aperture 62 formed in the housing 18. The fastener 58 is further secured to the housing 18 so that the resilient bushing 30 is secured to the housing 18. The fastener 58 is secured to the housing 18 by deforming at least one end of the fastener 58 with a tool (not shown). Any tool capable of deforming the end of the fastener 58 can be employed for this purpose. By way of example only, a tool designed to grasp one end of the fastener 58 and deform the opposite end can be employed, if desired. As shown in
In the illustrated construction of
In the illustrated exemplary embodiment, a tubular support 82 is also employed to mount the bracket 26 to the housing 18. The tubular support 82 shown in
In some embodiments, the tubular support 82 is used to prevent buckling of the fastener 58 and to limit the amount which an installation tool (not shown) can compress the fastener 58. As a result, the tubular support 82 can have any of a number of shapes capable of preventing buckling of the fastener 58 (e.g., a straight tube without an enlarged end, a tapered lug, and the like). The resilient bushing 30 can be sized with a length dimension (i.e., along an axis parallel to the shank 90) that is no shorter than the length of the hollow shank 90 of the tubular support 82. In some cases, the length of the resilient bushing 30 is longer than that of the hollow shank 90, thereby providing a pre-loaded resilient bushing 30.
In the illustrated exemplary construction, the shank 74 of the fastener 58 is inserted through the hollow shank 90 of the tubular support 82 and the aperture 62 formed in the housing 18. The hollow shank 90 of the tubular support 82 can provide structural reinforcement and stability to the shank 74 of the fastener 58. For instance, the hollow shank 90 of the tubular support 82 can help prevent the shank 74 of the fastener 58 from buckling under applied loads (e.g., stress placed upon the bracket 26, compression forces placed upon the shank 74 of the fastener 58 during the fastening process, and the like). The length dimension of the resilient bushing 30, the length of the hollow shank 90 of the tubular support 82, and the length of the shank 74 of the fastener 58 can be sized such that upon deforming the fastener 58 to secure the bracket 26 to the housing 18, the head 66 is drawn against the hollow shank 90 of the tubular support 82. However, in other constructions of the blower assembly 10, the tubular support 82 is omitted, such that the resilient bushing 30 is abutted against the surface 94 of the housing 18.
The one-piece, deformable fastener 58 can allow for a simplified method of assembling the motor assembly 14 to the housing 18. In this regard, the motor assembly 14 can be pre-assembled before being assembled with the housing 18. Any of a number of differently sequenced steps can be carried out to pre-assemble the motor assembly 14. One such method of pre-assembling the motor assembly 14 includes coupling the electric motor 22 to the bracket 26, then coupling the cooling fan 34 to the driveshaft. The motor 22 can be coupled to the bracket 26, and the cooling fan 34 coupled to the driveshaft in any conventional manner.
Each resilient bushing 30 can be coupled to the bracket 26 by engaging the groove 50 formed in the resilient bushing 30 with the mating flange, edge, or protrusion 54 in the bracket 26 as described above. This can be performed at any time during pre-assembly of the motor assembly 14 (i.e., before, concurrently, or after coupling the motor 22 and the bracket 26) or at another time. If employed, the tubular support 82 can also be engaged with the resilient bushing 30 while pre-assembling the motor assembly 14. However, the tubular support 82 can instead be engaged with the resilient bushing 30 during a separate step after pre-assembling the motor assembly 14.
In those embodiments in which the motor assembly 14 is pre-assembled, the pre-assembled motor assembly 14 can be positioned such that each resilient bushing 30 is positioned relative to (e.g., over) a respective aperture 62 formed at an outside surface 94 or other mounting portion of the housing 18. If one or more tubular supports 82 are pre-assembled with the motor assembly 14, then the motor assembly 14 can be positioned such that the tubular supports 82 (e.g., the bases 86 of the tubular supports 82) abut the housing 18 and the central aperture 46 of the resilient bushing 30 is aligned with the aperture 62 formed in the housing 18.
After positioning the resilient bushings 30 adjacent apertures 62 in the housing 18, the shanks 74 of the fasteners 58 are inserted through the resilient bushings 30 (and the hollow shanks 90 of the tubular support 82, if employed) and through the apertures 62 formed in the housing 18, such that the head 66 of the fastener 58 is located outside of the housing 18. With reference to the illustrated exemplary embodiment of
The one-piece, deformable fastener 58 illustrated in
The one-piece, deformable fastener 58 illustrated in
The deformable fastener 58 illustrated in
By virtue of the shape of the fastener 58, the deformed end portion 70 (or the head 66, in some embodiments) can occupy relatively little space inside the housing 18 (see
With reference to
With reference to
With continued reference to the exemplary illustrated embodiment of
In other embodiments, the tubular support 98 and the fastener 102 illustrated in
The embodiments described above and illustrated in the figures are presented by way of example only and are not intended as a limitation upon the concepts and principles of the present invention. As such, it will be appreciated by one having ordinary skill in the art that various changes in the elements and their configuration and arrangement are possible without departing from the spirit and scope of the present invention as set forth in the appended claims.
For example, and as mentioned above, some embodiments of the blower assembly 10 employ no resilient bushings 30 to mount the motor assembly 14 to the housing 18. By way of example only, the embodiment of the present invention illustrated in
Another example of alternative embodiments falling within the present invention relates to the use of the tubular support 90 to secure the bracket 26 to the housing 18. In particular, in some embodiments the fastener 58 (referring to the embodiment illustrated in
Claims
1. A blower assembly, comprising:
- a housing adapted to receive a fan therein;
- a bracket coupled to the housing;
- a motor supported on the bracket and drivably coupled to the fan;
- a resilient bushing coupled to the housing and positioned to support the bracket thereon; and
- a one-piece fastener coupling the resilient bushing to the housing, the one-piece fastener including a first retaining portion and a second retaining portion, the resilient bushing and at least a portion of the housing being secured between the first retaining portion and the second retaining portion.
2. The blower assembly of claim 1, wherein the first retaining portion comprises a head, and wherein the second retaining portion comprises a deformed end portion of a shank extending from the head.
3. The blower assembly of claim 2, wherein the head is larger than the deformed end portion of the shank.
4. The blower assembly of claim 2, wherein the head is positioned adjacent the resilient bushing, and wherein the deformed end portion of the shank is positioned adjacent the housing.
5. The blower assembly of claim 4, wherein:
- the fastener is received within an aperture in the bracket; and
- the head includes a diameter no smaller than a diameter of the aperture.
6. The blower assembly of claim 2, wherein at least a portion of the shank is hollow.
7. The blower assembly of claim 1, further comprising a tubular support supporting at least a portion of the one-piece fastener, the tubular support having a base and a hollow shank extending from the base along a longitudinal axis.
8. The blower assembly of claim 7, wherein the base is positioned adjacent the housing and the resilient bushing.
9. The blower assembly of claim 8, wherein the housing is secured between the base and one of the first and second retaining portions.
10. The blower assembly of claim 9, wherein the one of the first and second retaining portions comprises a deformed end portion of the one-piece fastener.
11. The blower assembly of claim 7, wherein the first retaining portion comprises a head, and wherein the second retaining portion comprises a deformed end portion of a shank extending from the head, and wherein the head is positioned adjacent the resilient bushing and an end of the hollow shank of the tubular support.
12. The blower assembly of claim 11, wherein the hollow shank of the tubular support is positioned within the resilient bushing.
13. The blower assembly of claim 11, wherein the shank of the one-piece fastener is received within the hollow shank of the tubular support.
14. The blower assembly of claim 7, wherein the hollow shank has a length dimension defined along the longitudinal axis no greater than a length dimension defined along the longitudinal axis of the resilient bushing.
15. The blower assembly of claim 7, wherein the base includes a diameter at least as large as a diameter of the resilient bushing.
16. A blower assembly, comprising:
- a housing adapted to receive a fan therein;
- a bracket coupled to the housing;
- a motor supported on the bracket and drivably coupled to the fan;
- a resilient bushing coupled to the housing and positioned to support the bracket; and
- a permanently deformable fastener coupling the resilient bushing to the housing, the permanently deformable fastener including a head and a deformable shank extending from the head, the resilient bushing and at least a portion of the housing being secured between the head and a deformed end portion of the shank.
17. The blower assembly of claim 16, wherein the head is larger than the deformed end portion of the shank.
18. The blower assembly of claim 16, wherein the head is positioned adjacent the resilient bushing, and wherein the deformed end portion of the shank is positioned adjacent the housing.
19. The blower assembly of claim 18, wherein:
- the fastener is received within an aperture in the bracket; and
- the head includes a diameter no smaller than a diameter of the aperture.
20. The blower assembly of claim 16, wherein at least a portion of the shank is hollow.
21. The blower assembly of claim 16, further comprising a tubular support supporting at least a portion of the permanently deformable fastener, wherein the tubular support includes a base and a hollow shank extending from the base along a longitudinal axis.
22. The blower assembly of claim 21, wherein the base is positioned adjacent the housing and the resilient bushing.
23. The blower assembly of claim 22, wherein the housing is secured between the base and the deformed end portion of the permanently deformable fastener.
24. The blower assembly of claim 21, wherein the hollow shank of the tubular support is positioned within the resilient bushing.
25. The blower assembly of claim 21, wherein the shank of the permanently-deformable fastener is supported within the hollow shank of the tubular support.
26. The blower assembly of claim 21, wherein the hollow shank of the tubular support has a length dimension defined along the longitudinal axis no greater than a length dimension defined along the longitudinal axis of the resilient bushing.
27. The blower assembly of claim 21, wherein the base includes a diameter at least as large as a diameter of the resilient bushing.
28. A blower assembly, comprising:
- a housing adapted to receive a fan therein;
- a bracket coupled to the housing;
- a motor supported on the bracket and drivably coupled to the fan;
- a resilient bushing coupled to the housing and positioned to support the bracket; and
- a permanently deformable fastener coupling the resilient bushing to the housing, the permanently deformable fastener including a head and a deformable shank protruding from the head, at least a portion of the shank being deformed to secure the resilient bushing between the housing and the head.
29. The blower assembly of claim 28, further comprising a tubular support within which the deformable shank of the permanently deformable fastener is received, wherein the tubular support includes a base and an at least partially hollow shank extending from the base.
30. The blower assembly of claim 29, wherein the housing is secured adjacent an end of the resilient bushing.
31. The blower assembly of claim 30, wherein the at least partially hollow shank is received within the resilient bushing.
32. The blower assembly of claim 30, wherein the head of the permanently-deformable fastener is positioned adjacent the resilient bushing.
33. The blower assembly of claim 29, wherein the deformable shank is insertable within the hollow shank of the tubular support.
34. The blower assembly of claim 33, wherein a portion of the deformable shank is deformable within the hollow shank of the tubular support to interlock the fastener and the tubular support.
35. A method of securing a motor assembly to a housing adapted to receive a fan therein, the method comprising:
- providing a resilient bushing;
- positioning the resilient bushing at a mounting portion of the housing;
- providing a permanently-deformable fastener having a head and a deformable shank extending from the head;
- inserting the permanently-deformable fastener through the resilient bushing and the mounting portion of the housing; and
- deforming an end portion of the shank such that the resilient bushing and the mounting portion of the housing is secured between the head and the deformed end portion of the shank.
36. The method of claim 35, further comprising inserting an at least partially hollow shank of a tubular support through the resilient bushing.
37. The method of claim 36, further comprising inserting the deformable shank through the at least partially hollow shank of the tubular support.
38. A blower assembly, comprising:
- a housing;
- a fan received within the housing;
- a motor mounting bracket;
- a motor drivably coupled to the fan and mounted upon the motor mounting bracket;
- a fastener having an end extending through an aperture in one of the motor mounting bracket and the housing, the end permanently deformable to secure the motor mounting bracket with respect to the housing.
39. The blower assembly of claim 38, wherein the aperture is a first aperture and the end is a first end of the fastener, the fastener having a second end extending through a second aperture in another of the motor mounting bracket and the housing.
40. The blower assembly of claim 39, wherein the second end of the fastener has an enlarged head.
Type: Application
Filed: Aug 28, 2003
Publication Date: Mar 3, 2005
Inventor: William Metzger (Crystal Lake, IL)
Application Number: 10/651,018