Pump
Types Explained - Free ebook online sample
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Pump Types Explained
By Mike Sondalini
Free book sample - Contents
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Review
The free online ebook sample
below is copyright protected. You may not modify, publish, transmit,
display, participate in the transfer or sale, create derivative works, or
in any way exploit, any of the free online ebook sample content, in whole
or in part.
GEAR PUMP OPERATION & MAINTENANCE
ABSTRACT
Gear pump operation & maintenance. A gear
pump uses two meshing, toothed cogs to force liquid from the
inlet of the pump through to the outlet. Being a positive
displacement pump there deliver very precise quantities for each
revolution and this means they have good dosing characteristics
regardless of their speed or the pressure into which they
discharge.
Keywords: internal, external teeth, pressure
relief, viscosity.
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Figure No. 1 shows a simplified drawing of an external teeth gear pump
on the left along with the alternate arrangement of internally pointing
teeth.
Figure No. 1. External and Internal Teeth Gear Pumps
GEAR PUMP DESIGN
Gear pumps use toothed gears turning inside a close tolerance housing
to draw-in liquid and then squeezing it out ahead of them. Paddle steamers
used the same principle of operation. These pumps are positive
displacement pumps and anything drawn into them will be forced out. As a
consequence they can generate very high discharge pressures. Materials of
construction vary from metals of various types and hardness through to
plastics of various types and hardness.
Maintaining the close tolerances between the housing and the cogs
is critical to efficient operation. The clearance between the edges, of
the teeth and the housing and the ends of the cogs and the back and front
walls of the housing are very small. Between the teeth and housing it is
in the order of 0.1 mm (0.004') while the clearances between the front
and back faces of the gears and the ends of the housing are only 0.025 mm
(0.001'). The fine clearances reduce liquid re-circulation back from the
high-pressure discharge to the low-pressure suction side and make these
pumps one of the most efficient available.
Gear pumps usually have one shaft penetration through the housing
for connection to the drive. The gear shafts on the smaller pumps can be
supported in journal bearings within the ends of the housing and are
lubricated by the product. On larger pumps rolling element bearings
mounted in bearing housings are used. To prevent surface to surface
contact of teeth the product provides the lubrication.
Continued in "Pump Types
Explained" ebook ...
Price: US$19.99
NOW US$12.50
OR CLICK COMPLETE
PUMP SET
|
Pump Types Explained
By Mike Sondalini
Free book sample - Contents
- Back to Ebook
Review
The free online ebook sample
below is copyright protected. You may not modify, publish, transmit,
display, participate in the transfer or sale, create derivative works, or
in any way exploit, any of the free online ebook sample content, in whole
or in part.
GEAR PUMP OPERATION & MAINTENANCE
ABSTRACT
Gear pump operation & maintenance. A gear
pump uses two meshing, toothed cogs to force liquid from the
inlet of the pump through to the outlet. Being a positive
displacement pump there deliver very precise quantities for each
revolution and this means they have good dosing characteristics
regardless of their speed or the pressure into which they
discharge.
Keywords: internal, external teeth, pressure
relief, viscosity.
|
Figure No. 1 shows a simplified drawing of an external teeth gear pump
on the left along with the alternate arrangement of internally pointing
teeth.
Figure No. 1. External and Internal Teeth Gear Pumps
GEAR PUMP DESIGN
Gear pumps use toothed gears turning inside a close tolerance housing
to draw-in liquid and then squeezing it out ahead of them. Paddle steamers
used the same principle of operation. These pumps are positive
displacement pumps and anything drawn into them will be forced out. As a
consequence they can generate very high discharge pressures. Materials of
construction vary from metals of various types and hardness through to
plastics of various types and hardness.
Maintaining the close tolerances between the housing and the cogs
is critical to efficient operation. The clearance between the edges, of
the teeth and the housing and the ends of the cogs and the back and front
walls of the housing are very small. Between the teeth and housing it is
in the order of 0.1 mm (0.004') while the clearances between the front
and back faces of the gears and the ends of the housing are only 0.025 mm
(0.001'). The fine clearances reduce liquid re-circulation back from the
high-pressure discharge to the low-pressure suction side and make these
pumps one of the most efficient available.
Gear pumps usually have one shaft penetration through the housing
for connection to the drive. The gear shafts on the smaller pumps can be
supported in journal bearings within the ends of the housing and are
lubricated by the product. On larger pumps rolling element bearings
mounted in bearing housings are used. To prevent surface to surface
contact of teeth the product provides the lubrication.
Continued in "Pump Types
Explained" ebook ...
Price: US$19.99
NOW US$12.50
OR CLICK COMPLETE
PUMP SET
|
|
|