Drive system for fluid flow device
A drive system for a fluid flow device including a transmission member (e.g., a drive belt or the like) coupled to a drive motor and a fluid flow device such that the transmission member can be readily loosened without the use of extra tooling such as lifting jacks, sliding plates, or other lifting devices. In some embodiments, a drive belt may be removed from the fluid flow system by shifting the position of the drive motor relative to the fluid flow device through application of manual force from a user's hand. The drive system includes a drive motor mounted on a mounting platform that is pivotably coupled about a longitudinal axis to a base. At least a portion of the drive motor is disposed above the longitudinal axis of the mounting platform.
This invention relates to a drive system for a fluid flow device, and certain embodiments related to coupling components for the drive system.
BACKGROUNDFluid flow systems may be used in a variety of industrial applications, including fluid conveyance, chemical mixing and dispensing, material drying, material transport, product packaging, and others. These systems typically include a fluid flow device, such as a vacuum pump, a rotary blower, or the like. The fluid flow devices are powered by a drive motor that is coupled to an input shaft of the fluid flow device. For example, a positive displacement rotary blower uses one or more impellers that are rotatably mounted in a chamber formed in a casing. Fluid to be processed, such as air, is introduced into an inlet at one end of the casing, and is forced by impellers to an outlet at the other end of the casing. In general, at least one input shaft is coupled to the impellers to provide rotational power to the impellers. This rotational power is transmitted to the blower's input shaft from the motor's output shaft. In many instances, a drive belt couples the output shaft of the drive motor to the input shaft of the blower.
Some fluid flow systems may include a rotary blower or vacuum pump mounted on a common base with the drive motor. Certain packaged systems may have smaller motors in order to provide portable or temporary fluid control solutions. Alternatively, the drive motor and fluid flow device may be mounted adjacent one another on a common base in more permanent applications, such as waste water treatment plants. In either case, certain factors affect the design of fluid flow systems that use a drive motor to transmit power to a fluid flow device.
The time and costs associated with system maintenance and repair is one factor that affects the design of a fluid flow system. For example, the drive belt that couples the drive motor to the rotary blower may need repair or replacement during the life of the fluid flow system. In some cases, the drive belt can only be removed when the drive motor and rotary blower are shifted closer to one another, which relieves the tension in the drive belt. A significant amount of labor and time may be required to disconnect the drive motor from the base to shift the position of the drive motor. In certain systems that have sizeable drive motors (e.g., some 30-hp electric motors can weigh approximately 450 lbs or more), jacking equipment, sliding tracks, or other specialized lifting devices are required to shift the position of the drive motor and loosen the tension of the drive belt. This tooling can increase the costs associated with the maintenance and repair of the fluid flow system. Moreover, additional time and tooling may be required to properly tension the new drive belt after the drive motor and fluid control device have been shifted back into the original positions.
Another factor that affects the design of the drive system of the fluid flow device is safety. In some circumstances, the drive motor and fluid flow device are spaced apart to increase the tension in the drive belt. If the drive belt is placed under sufficient stress, the belt may break or become severely deformed. Depending on the construction of the system, the drive motor or the fluid flow device may unexpectedly shift positions when the tension in the belt is eliminated. Such unexpected movements may injure nearby workers or otherwise damage equipment.
SUMMARYCertain embodiments of a fluid flow system provide a transmission member (e.g., a drive belt or the like) coupled to a drive motor and a fluid flow device such that the transmission member can be readily loosened without the use of extra tooling such as lifting jacks, sliding plates, or other lifting devices. In some embodiments, a drive belt may be removed from the fluid flow system by shifting the position of the drive motor relative to the fluid flow device through application of manual force from a user's hand.
In one illustrative embodiment, a system includes a drive motor that is pivotably coupled to a base about a first axis. The drive motor has an output member that is rotatable about a second axis. The second axis is substantially parallel to and spaced apart from the first axis, and at least a portion of the drive motor and the first axis are disposed vertically relative to one another. The system also includes a fluid flow device coupled to the base. The fluid flow device has an input member. The system further includes a transmission member to engage with the output member and the input member to transmit rotational power from the drive motor to the fluid flow device.
This and other embodiments may be configured to provide one or more of the following advantages. First, the fluid flow system may include a transmission member (e.g., a drive belt or the like) that can be safely loosened by applying a force from the user's hand to the side of the drive motor or another component. Second, replacement of the transmission member may be accomplished without the use of a lifting jack or other such devices. Third, the fluid flow system may include a self-tensioning apparatus to properly tension the transmission member after installation. Fourth, the system may include one or more safety mechanisms to limit the pivoting movement of the drive motor relative to the base. Such safety mechanisms may prevent harm to the user or other equipment in the event of transmission member breakage. Some or all of these and other advantages may be provided by the stretching systems described herein.
The details of one or more embodiments of the invention are set forth in the accompanying drawings and the description below. Other features, objects, and advantages of the invention will be apparent from the description and drawings, and from the claims.
DESCRIPTION OF DRAWINGS
Like reference symbols in the various drawings indicate like elements.
DETAILED DESCRIPTION OF ILLUSTRATIVE EMBODIMENTSA number of embodiments of a fluid flow system provide a transmission member, such as a belt or cable, coupled to a drive motor and to a fluid flow device in a manner that permits the transmission member to be readily loosened by application of manual force from a user's hand to a component of the system. In certain preferred embodiments, the drive belt may be removed from the drive motor and/or the fluid flow device without the use of extra tooling such as lifting jacks or other such devices.
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An inlet filter 180 may be connected to the fluid flow device 150 to prevent undesirable matter from entering the fluid flow device 150. The inlet filter 180 may be connected to the flow device 150 using a slip-on connection, a threaded engagement, or other fastening devices. The inlet filter 180 is adapted to receive fluid from a source, such as a supply tank or from ambient air. The fluid flow system 100 may control the flow of almost any type of fluid, such as air, other gases, water, oil, other liquids, or mixtures thereof. When the fluid flow system 100 is operating, the fluid may be passed through the inlet filter 180 and into the internal chamber of the fluid flow device 150.
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The fluid flow system 100 may include a pressure relief valve 190, as shown in
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In this embodiment, the drive motor 130 is depicted as an electric motor having a NEMA frame. (The National Electrical Manufacturers Association (NEMA) has established industry-standard, base-mounted motor dimensions.) The drive motor 130 depicted in this embodiment has a substantially cylindrical casing 137 with fins 138 extending therefrom. Also, this embodiment of the drive motor 130 includes a junction box 139 for electrical interconnection with a power source. It should be understood that other drive motors, such as gasoline-powered motors, electrical servo motors, or other rotational output devices, may be pivotably coupled to the base 110 and used in the fluid flow system 100.
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In one presently preferred embodiment, two platforms 112 are mounted to the shaft 114 such that the one platform 112 may be adjusted relative to the other platform 112 along the longitudinal axis 115. For example, a bushing-and-setscrew connection may be used between each platform 112 and the shaft 114 so that each platform 122 may be shifted along the shaft 114 and then locked into a desired position. As such, the platforms 112 may be adjustable relative to one another to accommodate driver motors 130 of various sizes. Furthermore, some embodiments may include mounting platforms 112 having laterally extending slots through which the motor's flanges 135 may be secured to the mounting platform by means of fasteners. These slots permit the drive motor 130 to be laterally shifted relative to the longitudinal axis 115. In these embodiments, adjusting the lateral position of the drive motor 130 on the mounting platforms 112 may accommodate driver motors 130 or transmission members 170 of various sizes.
In this embodiment, the output axis 136 of the drive motor 130, the input axis 156 of the flow device 150, and the longitudinal axis 115 of the platform 112 each extend in a substantially horizontal direction and are substantially parallel to one another. Accordingly, as the drive motor 130 pivots about the longitudinal axis 115 of the platform 112, the output axis 136 and the input axis 156 remain substantially parallel to one another, yet the distance between the output axis 136 and the input axis 156 is modified. For example, if the drive motor 130 is pivoted about the axis 115 toward the fluid flow device 150, the distance between the output axis 136 and the input axis 156 is decreased, thereby reducing the tension of the transmission member 170. On the other hand, if the drive motor 130 is pivoted about the axis 115 away from the fluid flow device 150, the distance between the output axis 136 and the input axis 156 is increased, thereby increasing the tension of the transmission member 170.
In a preferred embodiment, the axis 115 and at least a portion of the drive motor 130 are disposed vertically relative to one another (e.g., at least a portion of the drive motor 130 is disposed above or below the longitudinal axis 115 of the platform 112, as shown, for example, in
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In this embodiment, the force from the spring 144 can be modified by adjusting the position of the cap 143 along the threaded shaft 142. For example, the cap 143 (or nut disposed above the cap) can be screwed along the threaded shaft 142 to adjust the position of the cap 143, thereby adjusting the compression of the spring 144. (The threads may extend only along certain portions of the threaded shaft 142.) The threaded shaft 142 may be pivotably engaged with the base 110 so that the compression force from the spring 144 remains substantially perpendicular to the mounting platform 112. If, for example, the mounting platform 112 is pivoted at a certain angle relative to the base 110, the threaded shaft 142 may pivot to extend in a position substantially normal to the platform 112. In the embodiment shown in
The tensioning system 140 can maintain sufficient tension in the transmission member 170 even if the transmission member 170 deforms during operation of the fluid flow system 100. In some embodiments, the transmission member 170 may comprise a material that is susceptible to creep or other deformation, such as when the transmission member 170 is a belt or a cable comprising a polymer material. After a large number of cycles during the operation of the drive motor 130, the tension in the belt may cause the belt material to creep or otherwise deform such that the circumferential length of the belt is slightly increased. This deformation or creep may reduce the tension in the belt if the distance between the output axis 136 and the input axis 156 remains unchanged. A reduction in tension may cause slippage or other inefficiencies between the transmission member 170 and at least one of the output portion 132 and the input portion 152. The tensioning system 140 may compensate for any gradual deformation of the transmission member 170 that occurs after numerous cycles of the drive motor operation. In the event that the transmission member 170 slightly deforms and increases in circumferential length (which may cause a reduction in the tension force), compression force from the spring 144 may cause the drive motor 130 to slightly pivot away from the flow device 150. This self-tensioning adjustment by the tensioning system 140 shifts the distance between the output axis 136 and the input axis 156 when a reduction in the tension of member 170 occurs, thereby maintaining a sufficient tension in the transmission member 170 during the operation of the fluid flow system 100.
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After the transmission member 170 is removed from the fluid system 100, a replacement transmission member 170 can be installed. With the drive motor 130 pivoted toward the fluid flow device 150 (refer, for example, to
Accordingly, certain embodiments of the fluid flow system 100 include a transmission member 170 that can be safely loosened and removed without the use of a lifting jack or other such devices. Furthermore, such replacement of the transmission member 170 may be accomplished by applying a force from the user's hand or handheld instruments. These features may reduce the labor and costs associated with the maintenance of the transmission member 170 in fluid flow systems.
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A number of embodiments of the invention have been described. Nevertheless, it will be understood that various modifications may be made without departing from the spirit and scope of the invention. Accordingly, other embodiments are within the scope of the following claims.
Claims
1. A drive system for a fluid flow device, comprising:
- a drive motor pivotably coupled to a base about a first longitudinal axis, the drive motor having an output member that is rotatable about a second axis that is substantially parallel to and spaced apart from the first axis, wherein at least a portion of the drive motor is disposed vertically above or below the first longitudinal axis;
- a fluid flow device coupled to the base, the fluid flow device having an input member; and
- a transmission member to engage with the output member and the input member to transmit rotational power from the drive motor to the fluid flow device.
2. The system of claim 1, wherein when the drive motor is in a first operative position relative to the base, the transmission member is under tension and engaged with output member and the input member.
3. The system of claim 2, wherein when the drive motor is in a second operative position relative to the base, tension in the transmission member is reduced such that the transmission member is disengagable from at least one of the output member or input member.
4. The system of claim 3, wherein the drive motor is pivoted about the first longitudinal axis toward the fluid flow device when in the second operative position.
5. The system of claim 1, wherein the drive motor is pivotably coupled to the base about the first axis such that the drive motor is pivotably movable from a first operative position to a second operative position by application of manual force from a user.
6. The system of claim 1, wherein the transmission member is disengagable from at least one of the output member or input member by application of manual force from a user to pivot the drive motor about the first longitudinal axis.
7. The system of claim 1, wherein the drive motor weighs at least 85 lbs and is pivotably coupled about the first longitudinal axis such that the drive motor is movable relative to the fluid flow device by application of manual force from a user's hand without aid from a separate lifting device.
8. The system of claim 1, further comprising a safety mechanism to limit the drive motor's pivoting movement about the first axis, wherein the safety mechanism includes at least one stopper that prevents the drive motor from pivoting more than 20 degrees from vertical.
9. The system of claim 1, further comprising a self-tensioning apparatus to apply a bias force to a component of the system such that a moment is created about the first longitudinal axis to urge the drive motor to pivot away from the fluid flow device.
10. The system of claim 1, further comprising a first mounting platform pivotably coupled to the base about the longitudinal axis, wherein the drive motor is mounted to the first mounting platform.
11. The system of claim 11, further comprising a second mounting platform pivotably coupled to the base about the longitudinal axis, the second mounting platform being adjustable along the longitudinal axis relative to the first mounting platform, wherein the drive motor is mounted on the first and second mounting platforms.
12. The system of claim 1, wherein the drive motor is an electric NEMA frame motor.
13. The system of claim 1, wherein the fluid flow device is selected from the group consisting of rotary blowers, vacuum pumps, and centrifugal flow control units.
14. The system of claim 1, wherein the transmission member is selected from a group consisting of belts, chains, and cables.
15. A drive system for a fluid flow device comprising:
- a drive motor disposed on a mounting platform,
- said mounting platform pivotably coupled about a longitudinal axis to a base,
- said drive motor having an output member that is rotatable about a second axis that is substantially parallel to and spaced apart from the first longitudinal axis, wherein at least a portion of the drive motor is disposed vertically above the first longitudinal axis of the mounting platform;
- a fluid flow device coupled to the base, the fluid flow device having an input member; and
- a transmission member to engage with the output member of the drive motor and the input member of the fluid flow device to transmit rotational power from the drive motor to the fluid flow device.
16. The drive system of claim 15, wherein the drive motor is positioned on the mounting platform such that a center of mass of the drive motor is disposed a distance of less than half the width of the drive motor apart from a vertical plane passing through the longitudinal axis of the mounting platform.
17. The drive system of claim 15, wherein a center of mass of the drive motor is positioned substantially above the longitudinal axis of the mounting platform.
18. The drive system of claim 15, further comprising a second mounting platform pivotably coupled about the longitudinal axis to the base, the second mounting platform being adjustable along the longitudinal axis relative to the first mounting platform; wherein the drive motor is disposed on the first and second mounting platforms.
19. A method for replacing a drive belt for a drive system of a fluid flow device, said method comprising:
- reducing tension in a drive belt by pivoting a drive motor about a first longitudinal axis toward a fluid flow device, the first longitudinal axis and at least a portion of the drive motor being disposed vertically above or below the longitudinal axis, wherein the drive motor has an output member that is rotatable about a second axis that is substantially parallel to and spaced apart from the first axis, and wherein the drive belt is engaged with the output portion of the drive motor and an input portion of the fluid flow device; and
- removing the drive belt from at least one of the output portion of the drive motor and the input portion of the fluid flow device.
20. The method of claim 19, wherein reducing tension in the drive belt comprises applying manual force from a user's hand to pivot the drive motor about the first longitudinal axis.
21. The method of claim 20, wherein the drive motor weighs at least 85 lbs and is pivotably coupled about the first axis such that the drive motor is movable relative to the fluid flow device by application of manual force from the user's hand without aid from a lifting device.
22. The method of claim 19, further comprising engaging a replacement drive belt with the output portion of the drive motor and the input portion of the fluid flow device.
23. The method of claim 22, further comprising increasing tension in the replacement drive belt by pivoting the drive motor about a first longitudinal axis away from the fluid flow device.
24. The method of claim 23, further comprising arranging a self-tensioning apparatus to apply a bias force such that a moment about the first longitudinal axis is created to urge the drive motor to pivot about the first longitudinal axis away from the fluid flow device.
Type: Application
Filed: Nov 30, 2004
Publication Date: Jun 8, 2006
Inventors: David Moorhouse (Huddersfield), Robert Albers (Connersville, IN)
Application Number: 10/999,267
International Classification: F04B 17/00 (20060101); F04B 35/00 (20060101);