I claim:
1. A multiple tube bundle heat exchanger, comprising:
a number of tube bundles, each of said tube bundles being formed as a self-contained integral unit having:
two axially spaced tube sheets; and
a plurality of heat exchanger tubes each with opposite axial ends, said two tube sheets mounted at said opposite axial ends of said heat exchanger tubes;
a casing having:
a tubular portion substantially coextending with said tube bundles and having:
an interior subdivided by partitions into a plurality of axial chambers, a number of said axial chambers corresponding to said number of said tube bundles, each of said chambers receiving one of said tube bundles;
two opposite axial ends; and
flanges disposed at said two opposite axial ends; and
head pieces removably mounted to said flanges, each of said head pieces having walls defining at least a first wall portion of a plenum chamber; and
said two tube sheets of each of said tube bundles respectively sealing an adjacent one of said head pieces and forming at least a second wall portion of a respective plenum chamber of said adjacent one head piece.
2. The multiple tube bundle heat exchanger according to claim 1, wherein said partitions have at least one fluid transfer opening adjacent at least one of said two opposite axial ends of said tubular portion to allow fluid flowing through said interior of said tubular portion to pass between adjacent ones of said chambers.
3. The multiple tube bundle heat exchanger according to claim 2, wherein said at least one fluid transfer opening is selectively obturated.
4. The multiple tube bundle heat exchanger according to claim 1, wherein said partitions have fluid transfer openings adjacent said two opposite axial ends of said tubular portion to allow fluid flowing through said interior of said tubular portion to pass between adjacent ones of said chambers.
5. The multiple tube bundle heat exchanger according to claim 4, wherein said fluid transfer openings are selectively obturated.
6. The multiple tube bundle heat exchanger according to claim 1, including a separate intermediate piece disposed between:
at least one of said two opposite axial ends of said tubular portion; and
an adjacent one of said head pieces to form an axial extension of said tubular portion.
7. The multiple tube bundle heat exchanger according to claim 6, wherein said intermediate piece has partitions forming axial extensions of said partitions of said tubular portion.
8. The multiple tube bundle heat exchanger according to claim 7, wherein said partitions of said intermediate piece have fluid transfer openings to allow fluid to pass between adjacent ones of said chambers in said tubular portion.
9. The multiple tube bundle heat exchanger according to claim 1, including a separate intermediate piece disposed between:
at least one of said two opposite axial ends of said tubular portion; and
an adjacent one of said head pieces to form an axial extension of said tubular portion;
said intermediate piece having partitions forming axial extensions of said partitions of said tubular portion; and
said partitions of said intermediate piece having fluid transfer openings to allow fluid to pass between adjacent ones of said chambers in said tubular portion.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. An apparatus comprising:
a gear assembly;
a first blade section comprising a first shaft, where the first shaft is connected to gears of the gear assembly and extends from a first side of the gear assembly; and
a second blade section comprising a second shaft and a cutting blade, where the second shaft is connected to the gears of the gear assembly and extends from a second opposite side of the gear assembly,
where the gear assembly is configured to rotate the second shaft in an opposite direction of rotation relative to rotation of the first shaft.
2. An apparatus as in claim 1 where the cutting blade is a second cutting blade and the first blade section comprises a first cutting blade.
3. An apparatus as in claim 2 further comprising a fastener configured to be directly stationarily attached to an end of a drive shaft of a motor, where fastener comprises an end having a polygon shaped cross section.
4. An apparatus as in claim 3 where the first cutting blade comprises an aperture having a polygon shaped cross section adapted to slide onto the polygon shaped end of the fastener.
5. An apparatus as in claim 4 where the first shaft comprises a polygon shaped cross section which is configured to slide into the polygon shaped aperture of the first cutting blade.
6. An apparatus as in claim 1 further comprising a conduit, where the gear assembly is configured to be connected inside the conduit by spacers to create an air flow path between an interior side of the conduit and an exterior lateral side of the gear assembly.
7. An apparatus as in claim 6 where a first end of the conduit is configured to be attached to a front air intake side of a fan impeller chamber, and an opposite second end of the conduit is configured to have a vegetation intake hose connected thereto.
8. An apparatus as in claim 1 where the cutting blade comprises four blade sections extending from the second shaft, where the cutting blade is a second cutting blade and the first blade section comprises a first cutting blade, and where the first cutting blade comprises four blade sections extending from the first shaft.
9. An apparatus as in claim 1 where the cutting blade comprises multiple cutting blades connected to the second shaft.
10. An apparatus as in claim 1 where the gear assembly comprises at least two sun gears respectively connected to the first and second shafts, and at least four planet gears connecting the sun gears to each other.
11. An apparatus as in claim 1 further comprising a motor, an fan impeller connected to a drive shaft of the motor, and where the first shaft is connected to the drive shaft to rotate with the drive shaft.
12. An apparatus comprising:
a conduit configured to be directly connected to a fan impeller chamber of a vegetation blower;
a vegetation shredder configured to be mounted inside the conduit, where the vegetation shredder comprises a first shaft configured to be removably connected to a drive shaft of a motor of the vegetation blower, a second shaft movably connected to the first shaft, and a plurality of blades mounted on the first and second shafts.
13. An apparatus as in claim 12 where the second shaft is movably connected to the first shaft by a gear assembly configured to rotate the second shaft in an opposite direction of rotation relative to rotation of the first shaft.
14. An apparatus as in claim 13 further comprising spacers connecting the gear assembly to the conduit to provide an air flow path between the gear assembly and an interior side of the conduit.
15. An apparatus as in claim 12 where the first shaft has a keyed cross sectional shape, and where the plurality of blades comprises a first blade with a mating keyed slot configured to be slidably positioned on the first shaft.
16. An apparatus as in claim 15 where the mating keyed slot of the first blade is configured to be slidably located on a keyed end of a fastener which is attached to a drive shaft of a motor.
17. An apparatus as in claim 16 further comprising a lock plate configured to attach to a front side of the fan impeller, where the lock plate is configured to be attached to the drive shaft by the fastener.
18. An apparatus comprising:
a conduit;
an assembly comprising a gear box and two shafts extending from opposite sides of the gear box, where the gear box is configured to rotate the shafts in opposite directions;
where the assembly is located in the conduit with an cut vegetation and air flow path between an interior side of the conduit and an exterior lateral side of the gear box.
19. A method comprising:
longitudinally sliding a first shaft of a vegetation shredder attachment into a keyed connection located proximate a first side of a fan impeller section of a vegetation blower; and
connecting a conduit of the vegetation shredder attachment to a front air intake side of a fan impeller chamber of the vegetation blower,
where the first shaft is adapted to be rotated through the keyed connection as the fan impeller section is rotated.
20. A method as in claim 19 where the keyed connection comprises a first blade having an aperture comprising a keyed cross sectional shape, where the aperture receives an end of a fastener connected to a drive shaft of a motor of the vegetation blower at one end of the aperture and an end of the first shaft of the vegetation shredder attachment is longitudinally slid into an opposite end of the aperture.
21. A method as in claim 19 further comprising:
locating a lock plate on the fan impeller section;
drilling a pilot hole into the fan impeller section by use of a template hole in the lock plate;
forming threads in the pilot hole;
relocating the lock plate to a relative rotated position; and
fastening the lock plate to the fan impeller section by a threaded end of a fastener passing through a fastener hole in the lock plate and being threaded into the threads in the pilot hole.