COOLING ATTACHMENT SYSTEM FOR COMPRESSOR MOTOR ASSEMBLY

Abstract

A compressor motor assembly and method of operation are described. The fan mount sleeve motor assembly has a motor housing for receiving a motor, a hollow motor shaft forming a cavity for receiving a pump shaft, a pump shaft extending from a pump, a rotational cooling unit shroud dimensioned and configured to receive a rotational cooling unit, wherein the rotational cooling unit shroud and rotational cooling unit have a central opening for receiving a pump shaft, and a keyed hub sleeve dimensioned and configured to house the pump shaft, wherein the keyed hub sleeve coupled to the pump shaft together are couplable to and received by the hollow motor shaft, and wherein the keyed hub sleeve fastens the rotational cooling unit to the pump shaft, allowing the rotation of the pump cooling fan to be fixed to the pump shaft rotation when coupled with the motor shaft.

Description

TECHNICAL FIELD

The present disclosure generally relates to a cooling attachment system for a compressor motor assembly, and more particularly to a fan a cooling attachment system for compressor motor assembly, method of construction, and method of operation that comprises dual hub sleeve that acts as a counterweight to lock a pump cooling fan to a pump shaft, allowing rotation of the pump cooling fan to be fixed to the pump shaft and motor rotor during operation of the motor.

BACKGROUND

On direct-coupled scroll compressors, a pump of the compressor is typically balanced by a coupling hub, which also serves as a mounting location for a pump-cooling fan. The coupling hub may feature counter-balance holes drilled into its face allowing it to serve multiple purposes. These counter-balance holes serve as: a mounting location for the pump-cooling fan; a counterbalance for a pump shaft; and a mounting location for the coupling. The coupling then mounts to a metal hub which is mounted to the motor shaft. It is through this coupling assembly that the power is distributed from the motor to the pump. The coupling allows two male shafts (the motor and the pump) to be connected. A fan is traditionally located on the back of the motor for cooling purposes.

This conventional arrangement of the coupling hub and fan consumes a significant amount of space. The motor requirements may impose the motor housing to be a larger size where space can be a premium for a given application and because of the large size requirement, the conventional arrangement is no longer a viable option for consumers.

SUMMARY

One aspect of the present disclosure includes a dual sleeve hub for coupling a motor to a compressor during operation, the dual sleeve hub including a cast cylindrical surface plate having a central axis and a cylindrical thickness spacing first and second sides; a central aperture passing from the first side to the second side about the central axis; and a hub shaft projecting from one of the first and second sides, the hub shaft having first and second sleeves sharing a common key slot.

Another aspect of the present disclosure includes a dual sleeve hub for coupling a motor to a compressor during operation, the dual sleeve hub including a cast cylindrical surface plate having a central axis and a cylindrical thickness spacing first and second sides; a central aperture passing from the first side to the second side about the central axis; and a hub shaft projecting from one of the first and second sides, the hub shaft having first and second sleeves sharing a common key slot. The dual sleeve hub further includes a plurality of tapped openings for securing a fan between a motor and compressor during operation.

Yet another aspect of the present disclosure includes a system for coupling a motor to a compressor during operation, the system having a pump having a male motor shaft, the pump for compressing air during rotational operation; a motor having a hollow motor shaft for rotating said pump during rotational operation; and a dual sleeve hub for coupling said motor to the pump during operation, the dual sleeve hub including: a cast cylindrical surface plate having a central axis and a cylindrical thickness spacing first and second sides; a central aperture passing from the first side to the second side about the central axis; and a hub shaft projecting from one of the first and second sides, the hub shaft having first and second sleeves sharing a common key slot such that the first sleeve is received by the hollow motor shaft during assembly for rotational coupling and the second sleeve receives the male pump shaft during assembly for rotational coupling; wherein the key slot is axially aligned with a blind key slot in the male pump shaft and the hollow motor shaft such that a key when positioned therein concomitantly rotates the dual sleeve hub and pump with the rotation of the motor during operation.

Another aspect of the present disclosure includes a system for coupling a motor to a compressor during operation, the system including a pump having a male motor shaft, the pump for compressing air during rotational operation; a motor having a hollow motor shaft for rotating the pump during rotational operation; and a dual sleeve hub for coupling the motor to the pump during operation. The dual sleeve hub includes a cast cylindrical surface plate having a central axis and a cylindrical thickness spacing first and second sides; a central aperture passing from the first side to the second side about the central axis; and a hub shaft projecting from one of the first and second sides, the hub shaft having first and second sleeves sharing a common key slot such that the first sleeve is received by the hollow motor shaft during assembly for rotational coupling and the second sleeve receives the male pump shaft during assembly for rotational coupling; wherein the key slot is axially aligned with a blind key slot in the male pump shaft and the hollow motor shaft such that a key when positioned therein concomitantly rotates the dual sleeve hub and pump with the rotation of the motor during operation. The system includes a cylindrical surface plate further having a plurality of tapped openings for securing a fan between a motor and compressor during operation.

Yet another aspect of the present disclosure includes a system for coupling a cooling arrangement between a motor to a compressor pump during operation, the system including a pump having a male motor shaft, the pump for compressing air during rotational operation; a motor having a hollow motor shaft for rotating the pump during rotational operation; and a dual sleeve hub for coupling the motor to the pump during operation. The dual sleeve hub includes a cast cylindrical surface plate having a central axis and a cylindrical thickness spacing first and second sides; a central aperture passing from the first side to the second side about the central axis; and a hub shaft projecting from one of the first and second sides, the hub shaft having first and second sleeves sharing a common key slot such that the first sleeve is received by the hollow motor shaft during assembly for rotational coupling and the second sleeve receives the male pump shaft during assembly for rotational coupling; wherein the key slot is axially aligned with a blind key slot in the male pump shaft and the hollow motor shaft such that a key when positioned therein concomitantly rotates the dual sleeve hub and pump with the rotation of the motor during operation; a cooling fan secured to the dual sleeve hub for cooling the motor and compressor during operation; and a flow passage surface positioned between the motor and the fan, the flow passage surface having a plurality of openings for cooling the motor and pump during operation.

Yet another aspect of the present disclosure includes a fan mount sleeve motor assembly having a motor housing for receiving a motor, the motor housing having cooling fins for the release of heat from the motor, a hollow motor shaft with a cavity for receiving a pump shaft; a pump shaft extending from a pump; a rotational cooling unit shroud dimensioned and configured to receive a rotational cooling unit, wherein the rotational cooling unit shroud and rotational cooling unit have a central opening for receiving a pump shaft; and a keyed hub sleeve dimensioned and configured to house the pump shaft, wherein the keyed hub sleeve coupled to the pump shaft together are couplable to and received by the hollow motor shaft, and wherein the keyed hub sleeve fastens the rotational cooling unit to the pump shaft, allowing the rotation of the pump cooling fan to be fixed to the pump shaft rotation when coupled with the motor shaft, and allowing the rotational cooling unit to draw heat from the motor housing.

Yet another aspect of the present disclosure includes a compressor motor assembly including a pump shaft extending from a pump; a rotational cooling unit shroud for housing a rotational cooling unit, wherein the rotational cooling unit shroud and rotational cooling unit have a central opening for receiving the pump shaft; and a keyed hub sleeve dimensioned and configured to house the pump shaft, wherein the keyed hub has a counterweight for balancing the pump shaft, and wherein the keyed hub sleeve fastens the rotational cooling unit to the pump shaft, allowing the rotation of the pump cooling fan to be fixed to the pump shaft rotation.

BRIEF DESCRIPTION OF THE DRAWINGS

The foregoing and other features and advantages of the present disclosure will become apparent to one skilled in the art to which the present disclosure relates upon consideration of the following description of the disclosure with reference to the accompanying drawings, wherein like reference numerals, unless otherwise described refer to like parts throughout the drawings and in which:

FIG. 1 is an exploded assembly view of a compressor motor assembly in accordance with one example embodiment of the present disclosure;

FIG. 2 illustrates an exploded perspective view of a compressor motor assembly in accordance with one example embodiment of the present disclosure;

FIG. 3 illustrates an exploded view of a pump portion and hub of a compressor motor assembly in accordance with one example embodiment of the present disclosure;

FIG. 4 illustrates a perspective view of a compressor motor assembly with the pump housing separated from the motor housing in accordance with one example embodiment of the present disclosure;

FIG. 5 illustrates a side view of a compressor motor assembly with the pump housing separated from the motor housing in accordance with one example embodiment of the present disclosure;

FIG. 6 illustrates a hub used in one example embodiment of the present disclosure;

FIG. 7 illustrates a flow path of air through a compressor motor assembly in accordance with one example embodiment of the present disclosure; and

FIG. 8 illustrates a cooling shroud used in one example embodiment of the present disclosure.

Skilled artisans will appreciate that elements in the figures are illustrated for simplicity and clarity and have not necessarily been drawn to scale. For example, the dimensions of some of the elements in the figures may be exaggerated relative to other elements to help to improve understanding of embodiments of the present disclosure.

The apparatus and method components have been represented where appropriate by conventional symbols in the drawings, showing only those specific details that are pertinent to understanding the embodiments of the present disclosure so as not to obscure the disclosure with details that will be readily apparent to those of ordinary skill in the art having the benefit of the description herein.

DETAILED DESCRIPTION

Referring now to the figures generally wherein like numbered features shown therein refer to like elements throughout unless otherwise noted. The present disclosure generally relates to a cooling attachment system for a compressor motor assembly, and more particularly to a cooling attachment system for a compressor motor assembly, method of construction, and method of operation that comprises a dual hub sleeve that acts as a counterweight to lock a pump cooling fan to a pump shaft, allowing rotation of the pump cooling fan to be fixed to the pump shaft and motor rotor during operation of the motor.

Turning now to the figures, FIG. 1 illustrates an exploded assembly view of a compressor motor assembly 10 in accordance with one example embodiment of the present disclosure. The compressor motor assembly 10 features a motor 12 and motor housing 14 dimensioned and configured to house the motor. The motor housing 14 features cooling fins 14a, that act as heat exchangers forming a flow path FP (see FIG. 7) of air over the motor 14 of the compressor motor assembly 10. The motor 12 includes a mounting plate 16 for securing compressor motor assembly 10 to a desired surface for a selected application. The motor housing 12 has a first end capped by end bell 18, and a second end 19 which comprises a hollow motor shaft 52 (see FIG. 2).

Illustrated in FIG. 2 is an exploded perspective view of a compressor motor assembly 10. The compressor motor assembly 10 is powered by a power supply 40 coupled to the motor housing 14. In one example embodiment, the power supply comprises a corded coupling to a power source. One of ordinary skill in the art, after reviewing the present disclosure, would understand that many power sources would be compatible with the compressor motor assembly 10 of the present disclosure. In one example embodiment, the compressor motor assembly has 5 HP horsepower. One of ordinary skill in the art, after reviewing the present disclosure, would understand that different levels of horsepower would be compatible with the compressor motor assembly 10 of the present disclosure.

As illustrated in FIG. 2, the compressor motor assembly comprises a heat exchange coupling arrangement 20 and a compressor 32. In one example embodiment, the compressor 32 is a scroll compressor. In another example embodiment, the compressor 32 is a Powerex scroll pump sold under part number SLAE having approximately five (5) to ten (10) horse power.

As further seen the in figures, the heat exchange coupling arrangement 20 is located between the motor 12 and a compressor or pump 32. The construction and location of the heat exchange coupling arrangement 20 remove the need for a traditional coupling hub that has been used with pump assemblies, consuming significant amounts of space. Advantageously, the heat exchange coupling arrangement 20 of the present disclosure reduces significantly space requirements in the assembly 10 between the motor and pump housings 12, 34, respectively allowing for a more compact assembly with space available compared to a traditional standard compressor package.

The heat exchange coupling arrangement 20 of the present disclosure comprises a shroud 22 and a rotatable cooling fan 28. In one example embodiment, the rotational cooling unit 28 comprises a squirrel cage fan with directional blades. One of ordinary skill in the art, after reviewing the present disclosure, would understand that a variety of rotational cooling units 28 would be compatible with the present disclosure.

The shroud 22 protects blades of the fan during operation and includes air flow passages (FP) 24 (see FIG. 2). The shroud 22 may be constructed from plastic, metal, any combination thereof, or other materials suitable for stability and effective heat transfer of the compressor motor assembly 10. The air flow passages 24 form a venturi effect (of high air pressure and low air speed) as the cooling air is drawn about the motor from the rotation of the fan 28. The cooling air is further drawn by the fan 28 across the motor housing fins 14a from beyond the first end or bell 18 of the motor 12 (cooling the motor) and continuing to flow through air flow passages 24. As the cooling air passes through the shroud 22 flow passages 24, the reduced size openings decrease the air pressure and increase the speed of the air as it advances to cool the pump or compressor 32.

In one example embodiment, the air flow passages 24 are primarily circular. In another example embodiment, the air flow passages 24 are ovular. One of the ordinary skill in the art, after reviewing the present disclosure, would understand that the air flow passages 24 would be effective comprising a plurality of different shapes.

In this example embodiment, the shroud 22 is coupled to the motor plate 16 by, and dimensioned and configured to hold, the contents of the heat exchange coupling arrangement 20, which is secured by a plurality of fasteners 26. The heat exchange coupling arrangement 20 comprises a central axis A having a central opening 25, providing sufficient space for the operating of a dual hub sleeve 30 that is part of the heat exchanger coupling arrangement 20.

Illustrated in FIG. 6, is one example embodiment of the dual hub sleeve 30. In this embodiment, the sleeve 30 acts as a counterweight to balance a pump shaft 36 used to operate the pump 32. The sleeve 30 also provides a surface plate 31 for attaching counterweights 33 for balancing the pump shaft (see FIGS. 2 and 6). In the illustrated example embodiment of FIG. 6, the counterweights 33 are cast into the surface plate 31.

The surface plate 31 in one example embodiment is cylindrical in shape, having a diameter that is less than an internal diameter of the fan 28. The surface plate 31 includes a number of tapped holes 35 from which fasteners 26 are used such that a portion pass through an internal supporting wall 37 of the fan 28 into the tapped holes, securing the fan to the surface plate of the sleeve 30. Stated another way, the sleeve 30 as shown in FIG. 6, includes tapped openings 35 which allow for a plurality of fasteners 26 to couple the sleeve 30 to the fan 28, advantageously saving space in the compressor motor assembly 10.

The sleeve or hub 30 in the illustrated example embodiment is a cast alloy having a first side 42 and second side 44. In one example embodiment, the counterweight projects from the second side 44, but should be appreciated that counterweights could be attached or cast on either side as would be appreciated by one of ordinary skill in the art having the benefit of reading this disclosure and viewing the accompanying figures.

A hub shaft 46 forming a first sleeve 46A and a second sleeve 46B is cast in the hub 30 and projects from the first surface 42. The first sleeve 46A includes a first diameter D1 designated as the hub's outer diameter. A second sleeve 46B includes a second diameter D2 designated as the hub's inner diameter (see FIG. 6). The second diameter D2 passes through the dual sleeve or hub 30 from the first side 42 to the second side 44. The first and second sleeves 46A and 46B, respectively share a keyway 37 that extends along a portion of the first side 42.

The hub shaft 46 passes through a central opening 25 of the fan 28 and is received during assembly to a hollow shaft 52 of the motor 12. The hollow shaft 52 of the motor 12 includes a second diameter D2 that is greater than D1 and sized to receive the first sleeve 46 for rotatable coupling.

The pump or compressor 32 includes a pump shaft 36 having a diameter D3 that is less than the second sleeve 46B diameter D2 and sized to form a rotatable coupling between the dual sleeve hub 30 and pump 32, such that the rotation of the coupling rotates the pump at the same rate and speed for any period of time. The motor 12 includes a hollow shaft 52 having a diameter D4 that is greater than the first sleeve diameter 46A diameter D1 that is sized to form a rotatable coupling between the dual sleeve hub 30 and motor, such that the rotation of the motor rotates the hub 30 at the same rate and speed for any period of time.

Securing the hollow shaft 52, to the first sleeve 46A to the second sleeve 46B and pump shaft 36 is a common key 38. The key 38 resides during assembly in a blind slot 39 of the pump shaft 36 and passes through keyway 37 of the dual sleeve hub 30 into a blind slot 54 of the hollow motor shaft 52. The common key couples and consumes the torque generated by the rotation motor 12 and motor shaft 52 to the dual sleeve hub 30, fan 28, and pump compressor 32.

In another example embodiment, the dual sleeve hub 30 is provided without a cooling arrangement 30 or fan 28 such that the motor 12, and pump 32 are directly rotatably coupled by the hub 30 as illustrated in FIG. 5. The arrangement of FIG. 5 also advantageously provides a compact space.

During operation FIG. 7 illustrates a flow path for convective heat transfer through the compressor motor assembly 10. Power source 40 delivers electrical energy to the motor 12, which transforms the electrical energy into mechanical energy and gives off heat, which is cooled by passing through the cooling fins 14a of the motor housing 14 as it is drawn in by the rotational movement of the fan 28. Advantageously, the heat exchange coupling arrangement 30 cools both the motor 12 and pump 32 in this way while saving space in both the pump housing 34 and the motor housing 12. The heat exchange coupling arrangement 20 rotates the fan 28 with the pump shaft 36 driven by the dual sleeve hub 30 coupling each to the motor 14. That is, the pump shaft 36 runs through central opening 25 of the fan 28, and shroud 22, into the dual sleeve hub 30 where it is coupled to the hub and motor shaft 52 where the assembly 10 is turned by the centrifugal force generated by the rotation of the motor 12.

Illustrated in FIG. 8 is another example embodiment of an assembly 10 having a tunnel 56 in fluid communication with the shroud 22. The tunnel 56 includes a first end 56a spaced by the body 56 of the tunnel until reaching a second end 56b. The tunnel 56 spans and envelops in one example embodiment the entire motor housing 14, increasing the cooling effect of the motor as the ambient air or fluid is drawn in the first opening 56a across cooling fins 14a toward the second end 56b of the tunnel. The air or fluid being pulled through the tunnel by the fan 28 as it operates to draw the air/fluid through the air flow passages 24 of the shroud and advanced to cool the pump 32.

In the foregoing specification, specific embodiments have been described. However, one of ordinary skill in the art appreciates that various modifications and changes can be made without departing from the scope of the disclosure as set forth in the claims below. Accordingly, the specification and figures are to be regarded in an illustrative rather than a restrictive sense, and all such modifications are intended to be included within the scope of present teachings.

The benefits, advantages, solutions to problems, and any element(s) that may cause any benefit, advantage, or solution to occur or become more pronounced are not to be construed as a critical, required, or essential features or elements of any or all the claims. The disclosure is defined solely by the appended claims including any amendments made during the pendency of this application and all equivalents of those claims as issued.

Moreover in this document, relational terms such as first and second, top and bottom, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. The terms “comprises,” “comprising,” “has”, “having,” “includes”, “including,” “contains”, “containing” or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises, has, includes, contains a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by “comprises . . . a”, “has . . . a”, “includes . . . a”, “contains . . . a” does not, without more constraints, preclude the existence of additional identical elements in the process, method, article, or apparatus that comprises, has, includes, contains the element. The terms “a” and “an” are defined as one or more unless explicitly stated otherwise herein. The terms “substantially”, “essentially”, “approximately”, “about” or any other version thereof, are defined as being close to as understood by one of ordinary skill in the art. In one non-limiting embodiment the terms are defined to be within for example 100%, in another possible embodiment within 5%, in another possible embodiment within 1%, and in another possible embodiment within 0.5%. The term “coupled” as used herein is defined as connected or in contact either temporarily or permanently, although not necessarily directly and not necessarily mechanically. A device or structure that is “configured” in a certain way is configured in at least that way, but may also be configured in ways that are not listed.

To the extent that the materials for any of the foregoing embodiments or components thereof are not specified, it is to be appreciated that suitable materials would be known by one of ordinary skill in the art for the intended purposes.

The Abstract of the Disclosure is provided to allow the reader to quickly ascertain the nature of the technical disclosure. It is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims. In addition, in the foregoing Detailed Description, it can be seen that various features are grouped together in various embodiments for the purpose of streamlining the disclosure. This method of disclosure is not to be interpreted as reflecting an intention that the claimed embodiments require more features than are expressly recited in each claim. Rather, as the following claims reflect, inventive subject matter lies in less than all features of a single disclosed embodiment. Thus the following claims are hereby incorporated into the Detailed Description, with each claim standing on its own as a separately claimed subject matter.

Claims

1. A dual sleeve hub for coupling a motor to a compressor during operation, the dual sleeve hub comprising: a cylindrical surface plate having a central axis and a cylindrical thickness spacing first and second sides;a central aperture passing from said first side to said second side about said central axis; anda hub shaft projecting from one of said first and second sides, said hub shaft having first and second sleeves sharing a common key slot.

2. The dual sleeve hub of claim 1 further comprising a plurality of tapped openings for securing a fan between a motor and compressor during operation.

3. A system for coupling a motor to a compressor during operation, the system comprising: a pump having a male motor shaft, the pump for compressing air during rotational operation;a motor having a hollow motor shaft for rotating said pump during rotational operation; anda dual sleeve hub for coupling said motor to said pump during operation, the dual sleeve hub comprising: a cast cylindrical surface plate having a central axis and a cylindrical thickness spacing first and second sides;a central aperture passing from said first side to said second side about said central axis; anda hub shaft projecting from one of said first and second sides, said hub shaft having first and second sleeves sharing a common key slot such that said first sleeve is received by said hollow motor shaft during assembly for rotational coupling and said second sleeve receives said male pump shaft during assembly for rotational coupling;wherein said key slot is axially aligned with a blind key slot in said male pump shaft and said hollow motor shaft such that a key when positioned therein concomitantly rotates said dual sleeve hub and pump with the rotation of said motor during operation.

4. The system of claim 3 wherein said cylindrical surface plate further comprises a plurality of tapped openings for securing a fan between a motor and compressor during operation.

5. The system of claim 3 wherein said cylindrical surface plate further comprises a counterweight providing rotational balance to the system during operation.

6. A system for coupling a cooling arrangement between a motor to a compressor pump during operation, the system comprising: a pump having a male motor shaft, the pump for compressing air during rotational operation;a motor having a hollow motor shaft for rotating said pump during rotational operation;a dual sleeve hub for coupling said motor to said pump during operation, the dual sleeve hub comprising: a cast cylindrical surface plate having a central axis and a cylindrical thickness spacing first and second sides;a central aperture passing from said first side to said second side about said central axis; anda hub shaft projecting from one of said first and second sides, said hub shaft having first and second sleeves sharing a common key slot such that said first sleeve is received by said hollow motor shaft during assembly for rotational coupling and said second sleeve receives said male pump shaft during assembly for rotational coupling;wherein said key slot is axially aligned with a blind key slot in said male pump shaft and said hollow motor shaft such that a key when positioned therein concomitantly rotates said dual sleeve hub and pump with the rotation of said motor during operation;a cooling fan secured to said dual sleeve hub for cooling said motor and compressor during operation; anda flow passage surface positioned between said motor and said fan, said flow passage surface having a plurality of openings for cooling said motor and pump during operation.

7. The system of claim 6 wherein said cast cylindrical surface plate further comprises a plurality of tapped openings for securing said fan between said motor and pump during operation.

8. The system of claim 6 wherein said cast cylindrical surface plate further comprises a counterweight providing rotational balance to the system during operation.

9. A fan mount sleeve motor assembly comprising: a motor housing for receiving a motor, the motor housing comprising cooling thins for the release of heat from the motor;a hollow motor shaft comprising a cavity for receiving a pump shaft;a pump shaft extending from a pump;a rotational cooling unit shroud dimensioned and configured to receive a rotational cooling unit, wherein the rotational cooling unit shroud and rotational cooling unit comprise a central opening for receiving a pump shaft; anda keyed hub sleeve dimensioned and configured to house the pump shaft, wherein the keyed hub sleeve coupled to the pump shaft together are couplable to and received by the hollow motor shaft, and wherein the keyed hub sleeve fastens the rotational cooling unit to the pump shaft, allowing the rotation of a pump cooling fan to be fixed to the pump shaft rotation when coupled with the motor shaft, and allowing the rotational cooling unit to draw heat from the motor housing.

10. The system of claim 9 wherein said keyed hub sleeve further comprises a plurality of tapped openings for securing said pump cooling fan between the motor and pump during operation.

11. The system of claim 9 wherein said keyed hub sleeve further comprises a counterweight providing rotational balance between the pump and motor during operation.

12. The system of claim 9 further comprising a tunnel having a first end connected to and extending about the length of said motor for directing air being drawn by said cooling fan through an opening in said tunnel located at a second end of said tunnel.

13. The system of claim 9 wherein said shroud further comprises a plurality of flow passages for the flow of forced air from said cooling fan during operation.

14. The system of claim 13 further comprising a tunnel having a first end connected to and extending about the length of said motor for directing air being drawn by said cooling fan through an opening in said tunnel located at a second end of said tunnel.

15. The system of claim 11 wherein said keyed hub sleeve further comprises a plurality of tapped openings for securing said pump cooling fan between the motor and pump during operation.

16. The system of claim 13 wherein said flow passages are circular.

17. The system of claim 13 wherein said flow passages are ovular.

18. A compressor motor assembly comprising: a pump shaft extending from a pump;a rotational cooling unit shroud for housing a rotational cooling unit, wherein the rotational cooling unit shroud and rotational cooling unit comprise a central opening for receiving the pump shaft; anda keyed hub sleeve dimensioned and configured to house the pump shaft, wherein the keyed hub comprises a counterweight for balancing the pump shaft, and wherein the keyed hub sleeve fastens the rotational cooling unit to the pump shaft, allowing the rotation of the pump cooling fan to be fixed to the pump shaft rotation.

19. The compressor motor assembly of claim 18 wherein said cooling fan is secured to said hub sleeve with fasteners.

20. The compressor motor assembly of claim 18 wherein said hub sleeve is enveloped by said cooling fan and said cooling unit shroud.