Adaptor Frame
An adaptor frame comprising an isolated drain path formed in the adaptor frame at a first end of the adaptor frame is disclosed and claimed. An inboard wall is formed in the adaptor frame at the first end and the inboard wall is positioned adjacent an interstitial area. The interstitial area is between a bearing and the first end of the adaptor frame. The inboard wall provides a first limit for the isolated drain path. An outboard wall is formed in the adaptor frame at the first end and is separated from the inboard wall by a predetermined amount along the axial dimension of a shaft passing through the adaptor frame. The outboard wall provides a second limit for the isolated drain path.
Applicant claim priority under 35 U.S.C. § 119(e) of provisional U.S. Patent Application Ser. No. 60/838,219 filed on Aug. 17, 2006, which is incorporated by reference herein.
FIELD OF INVENTIONThe present invention relates to an adaptor frame and bearing isolator for pumps wherein both the adaptor frame and the bearing isolator have multiple embodiments.
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENTNo federal funds were used to develop or create the invention disclosed and described in the patent application.
REFERENCE TO SEQUENCE LISTING, A TABLE, OR A COMPUTER PROGRAM LISTING COMPACT DISK APPENDIXNot Applicable
Before explaining at least one embodiment of the invention in detail, it is to be understood that the invention is not limited in its application to the details of construction and the arrangement of the components set forth in the following description or illustrated in the drawings. The invention is capable of other embodiments or of being practiced or carried out in various ways. Also, it is to be understood that the phraseology and terminology employed herein is for the purpose of description and should not be regarded as limiting. Furthermore, the bearing isolator 27 used with the present art adaptor frame 20 includes, but is not limited to, those disclosed in U.S. Pat. Nos. 6,234,489, 6,062,568, 5,378,000, 5,221,095, and 4,175,752, all of which are incorporated herein by reference. By way of example,
The term “bearing isolator” as defined herein is meant to include such structures disclosed herein and in the prior art consisting of a stator 21 and a rotor 16 cooperating to protect a bearing 5 either through contaminant exclusion, lubricant retention, or both. However, the present art adaptor frame 20 may also be used without a bearing isolator 27, as shown in the second embodiment pictured in
Referring now to the drawings, wherein like reference numerals designate identical or corresponding parts throughout the several views, a prior art pump assembly 4 and relevant portions thereof is shown in
The bearing housing 1 is typically arranged with at least one bearing 5 positioned between the bearing housing 1 and the shaft 7, as indicated in
Certain prior art bearing isolators 27 collect lubricant 12 splashed by the bearing 5 or other rotating components and drain or return the lubricant 12 to the lubricant sump 14, thus preventing escape of the lubricant 12 from the bearing housing 1 and providing lubricant 12 retention. As taught by the prior art, a separate bearing isolator 27 was required to be fit and inserted into the adaptor frame 2 in order for lubricant 12 to be returned to the bearing housing 1. The prior art also required that lubricant 12 collected in the bearing isolator 27 be drained or returned into the bearing housing 1 directly against the force and splash of lubricant 12 created by the bearing 5 or other rotating components of the equipment.
In prior art adaptor frames 2, lubricant 12 collected in the labyrinth groove 8 and drained from the labyrinth return drain 9 must first pass through the interstitial area 11, and then through the isolated lubricant return passage 13 to reach the lubricant sump 14. Lubricant 12 exiting the bearing isolator 6 through the labyrinth return drain 9 does so merely by the force of gravity since the labyrinth return drain 9 is located in the non-rotating portion (i.e., the stator 21) of the bearing isolator 27. When lubricant 12 drained from the labyrinth return drain 9 encounters lubricant 12 splashed or flung from the bearing 5 or other rotational components, the bearing isolator 27 cannot drain lubricant 12 back to the lubricant sump 14 effectively. This is because placing the bearing isolator 27 adjacent to the bearing 5 or other rotational components with merely an interstitial area 11 in between, the lubricant 12 splashed or flung from the rotational components impedes the flow of lubricant 12 drained from the bearing isolator 27 when the drained lubricant 12 is in the interstitial area 11. That is, there is no structure in the prior art that alleviates the effects the splash or force of lubricant 12 (created by rotational components in the interstitial area 11) has on lubricant 12 drained from the bearing isolator 27 when that lubricant 12 is in the interstitial area 11. The centrifugal force and splash the bearing 5 or other rotational components impart to lubricant 12 in the interstitial area 11 is often greater than the gravitational force imparted to that lubricant 12. That is, the lubricant 12 draining from the bearing isolator 27 must work against the force and splash of lubricant 12 adjacent the bearing 5 or other rotational components near the interstitial area 11 to drain properly from both the bearing isolator 27 and the interstitial area 11.
The failure of the prior art described above is accentuated in certain situations, depending on the lubricant level 15 in the lubricant sump 14.
The various embodiments of the present art, shown in
As shown in
As noted, the present art adaptor frame 20 provides an isolated drain path 10 to the isolated lubricant return passage 13 for lubricant 12 drained from the bearing isolator 27. The isolated drain path 10 is generally formed by an inboard wall 22 and an outboard wall 19 fashioned in the present art adaptor frame 20. As shown in the first embodiment (
In the embodiment shown in
As noted above, in the first embodiment of the present art adaptor frame 20 shown in
In the second embodiment of the present art adaptor frame 20 shown in
A third embodiment of the present art adaptor frame 20 and bearing isolator 27 is shown in
In all embodiments of the present art adaptor frame 20, the labyrinth groove 8 may be a single groove or may be formed through a plurality of grooves. Furthermore, a portion of the bearing isolator 27 may be used to form a portion of the adaptor frame groove 31, as in the first embodiment shown in
It should be noted that the present invention is not limited to the specific embodiments pictured and described herein, but is intended to apply to all similar adaptor frames facilitating improved return of lubricant 12 to the lubricant sump 14. Modifications and alterations from the described embodiments will occur to those skilled in the art without departure from the spirit and scope of the present invention.
Claims
1. An adaptor frame comprising:
- a. an isolated drain path formed in said adaptor frame at a first end of said adaptor frame;
- b. an inboard wall formed in said adaptor frame at said first end, wherein said inboard wall is positioned adjacent an interstitial area, wherein said interstitial area is between a bearing and said first end of said adaptor frame, and wherein said inboard wall provides a first limit for said isolated drain path; and,
- c. an outboard wall formed in said adaptor frame at said first end, wherein said outboard wall is separated from said inboard wall by a predetermined amount along the axial dimension of a shaft passing through said adaptor frame, and wherein said outboard wall provides a second limit for said isolated drain path.
2. The adaptor frame according to claim 1 wherein said adaptor frame first end is fashioned with at least one O-ring groove to engage a bearing housing.
3. The adaptor frame according to claim 1 further defined as not including said outboard wall.
4. The adaptor frame according to claim 1 wherein at least a portion of said inboard wall is formed by a bearing isolator.
5. The adaptor frame according to claim 1 further comprising an annular adaptor frame groove adjacent said inboard wall and said outboard wall, wherein said adaptor frame groove is in fluid communication with said isolated drain path.
6. The adaptor frame according to claim 5 wherein the radial dimension of said adaptor frame groove with respect to said shaft increases on a portion of said adaptor frame groove adjacent said isolated return path
7. The adaptor frame according to claim 1 wherein a radial distance between the ends of said inboard wall and said outboard wall and said shaft is in the range of 0.0001-1.0 inches.
8. The adaptor frame according to claim 1 wherein at least a portion of said inboard wall is formed by a bearing isolator and wherein at least a portion of said outboard wall is formed by said bearing isolator.
9. The adaptor frame according to claim 8 wherein said bearing isolator includes a labyrinth groove, wherein said bearing isolator includes a labyrinth return drain, and wherein said labyrinth return drain is in fluid communication with said isolated drain path.
10. An adaptor frame comprising:
- a. a first end fashioned to accept a bearing isolator, wherein said first end is engagable with a bearing housing at a bearing housing/adaptor frame interface, and wherein said bearing isolator is at least capable of retaining lubricant;
- b. a second end engagable with a pump casing;
- c. an isolated drain path formed in said adaptor frame at said first end, wherein said isolated drain path provides a conduit to return lubricant drained from said bearing isolator to said bearing housing;
- d. an inboard wall formed in said adaptor frame, wherein an inboard wall exterior face is oriented adjacent an interstitial area between a bearing and said adaptor frame, wherein an inboard wall interior face provides a first limit for said isolated drain path, and wherein said bearing is installed in said bearing housing; and,
- e. an outboard wall formed in said adaptor frame, wherein an outboard wall interior face provides a second limit for said isolated drain path, wherein said outboard wall interior face is adjacent said inboard wall interior face and separated therefrom by a predetermined amount along the axial dimension of a shaft passing through said bearing housing, said adaptor frame, and into said pump casing.
11. The adaptor frame according to claim 10 wherein said adaptor frame first end is fashioned with O-ring grooves to engage said bearing housing at said bearing housing/adaptor frame interface.
12. The adaptor frame according to claim 10 wherein at least a portion of said inboard wall is formed by a bearing isolator.
13. The adaptor frame according to claim 10 further defined as not including said outboard wall.
14. The adaptor frame according to claim 10 further comprising an annular adaptor frame groove adjacent said inboard wall and said outboard wall, wherein the axial dimension of said adaptor frame groove is defined by said inboard wall interior face and said outboard wall interior face, and wherein said adaptor frame groove is in fluid communication with said isolated drain path.
15. The adaptor frame according to claim 10 wherein at least a portion of said inboard wall is formed by a bearing isolator and wherein at least a portion of said outboard wall is formed by said bearing isolator.
16. The adaptor frame according to claim 15 wherein said bearing isolator includes a labyrinth groove, wherein said bearing isolator includes a labyrinth return drain, and wherein said labyrinth return drain is in fluid communication with said isolated drain path.
17. A pump assembly comprising:
- a. a pump casing, wherein said pump casing houses an internal portion of a pump, and wherein a shaft passing through at least a portion of said pump casing provides energy to said internal portion of a pump;
- b. a bearing housing, wherein said bearing housing is fashioned to accept at least one bearing, wherein said shaft passes through said bearing housing and rotationally engages said at least one bearing;
- c. an adaptor frame, wherein said adaptor frame is fashioned to provide an interface between said pump casing and said bearing housing, said adaptor frame comprising: i. an isolated drain path formed in said adaptor frame at a first end of said adaptor frame, wherein said first end of said adaptor frame is arranged adjacent said bearing housing; ii. an inboard wall formed in said adaptor frame, wherein said inboard wall is positioned adjacent an interstitial area between said at least one bearing and said adaptor frame, and wherein said inboard wall provides a first limit for said isolated drain path; and, iii. an outboard wall formed in said adaptor frame, wherein said outboard wall is separated from said inboard wall by a predetermined amount along the axial dimension of said shaft, wherein said shaft passes through said adaptor frame, and wherein said outboard wall provides a second limit for said isolated drain path.
18. A bearing isolator comprising:
- a. a stator; and,
- b. a rotor, wherein said stator and said rotor cooperate to form said bearing isolator, wherein said bearing isolator includes an inboard wall and an outboard wall, wherein said inboard wall and said outboard wall cooperate to form a labyrinth groove, wherein said labyrinth groove includes a labyrinth return drain that interfaces with an isolated drain path formed in an adaptor frame.
Type: Application
Filed: Aug 16, 2007
Publication Date: Feb 21, 2008
Inventors: David C. Orlowski (Punta Gorda, FL), Neil F. Hoehle (Solon, IA)
Application Number: 11/893,567
International Classification: F01D 25/00 (20060101);