DISPOSITIF DE CIRCULATION D'EAU DE REFROIDISSEMENT A PRESSE-ETOUPE MONTE SUR L'ARBRE D'ENTRAINEMENT ET MU PAR LA ROUE DE LA POMPE

SHAFT MOUNTED AND IMPELLER MOUNTED PUMPING SLEEVE AND BUSHING

Abrégé anglais

The present invention relates to a Shaft-Mounted and Impeller-
Mounted Pumping Sleeve and Bushing. Various devices have been
previously proposed for relieving the pressure inside the stuffing
box of a pump. In practice, however, these devices have proven to
be inefficient and expensive to install. Such devices use a
centrifugal force to displace the fluid by the use of a repeller.
They do not perform the following functions:
A. circulate the fluid through the stuffing box
B. regulate pressure in the stuffing box
C. allow for any impeller adjustment as the
impeller wears
It is an objective of the present invention to avoid or minimise
one or more of the above mentioned disadvantages.

Revendications

CLAIMS
The pumping sleeve acts as a vibration damper. As the fluid is
being pumped by the sleeve is being positively displaced, it acts
to stabilize the impeller and overcome shaft deflections.
The pumping sleeve lowers the pressure in the stuffing box to one
atmosphere, if desired, through the use of a regulator.
The pumping sleeve reduces the temperature in the stuffing box to
ambient, if desired, by the use of a cooler.
The pumping sleeve will, in the case of a mechanical seal or
packing failure, eliminate fluid leakage to atmosphere by lowering
the pressure in the stuffing box. In doing so, it also eliminates
the flash point of a flammable liquid by lowering the temperature
in the stuffing box.
The pumping sleeve will increase mechanical seal life by lowering
the pressure and the temperature in the stuffing box. With less
vibration, the pump will run more efficiently, resulting in less
mechanical failures.

Description

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SPECIFICATION
The present invention provides full adjustment to the impeller
in case of wear. Any adjustment made occurs on the horizontal
plane so that the clearances between the pumping sleeve and the
bushing or stuffing box boar remain the same.
The present invention provides a positive displacement pumping
action. This means that suction from the suction side of the pump
goes through a cooler and regulator, then into the stuffing box,
where it is then discharged into the discharge side of the pump.
The suction is therefore positive. This positive action can
overcome the pressure of any centrifugal force present in the
discharge.
The lip seal provides a fluid seal in a static position when the
pump is not running and prevents fluid pressure from entering the
stuffing box. The lip seal retains a dynamic position when the
pump is running by means of fluid suction and flow, eliminating
shaft wear.
The volume velocity and pressure can be calculated by the number
and depth of the screws on the pumping sleeve in order to obtain
the correct flow and pressure for different pumping applications.
The pumping sleeve and bushing can be made from any required
material and installed to any A. N. S. I. or A. P. I. pump with
little or no machining to the stuffing bo~. The sleeve can be
manufactured with an anti-clockwise screw for the A. P. I. pump
application.

The features and benefits of the invention will become clear
through the following detailed description. They can also be
referred to through the accompanying illustrations.
Figure 1. is a perspective view of the benefits of the invention.
Figures 2, 3 & 4. are a simulation of how, during use, a range of
different number, depth and angle of pumping screws work.
Figures 5 & 6. illustrate the use of the impeller-mounted press
pumplng sleeve.
Figure 7. is a shaft-mounted pumping sleeve and lip seal.
Figure 8. is a standard shaft sleeve installation.
Figure 9. is a shaft-mounted pumping sleeve installation.
Figure 10. is the front, side and cross-sectional view, as in
figure 9., of the pumping sleeve.
Figure 11. is a standard shaft-mounted sleeve, as in figure 8.
In figure 7., the pumping sleeve is secured in position between the
threaded end of the impeller and the threaded end of the shaft.
In figures 1, 5 & 6. is the press-fit impeller pumping sleeve and
bushing.
In figure 1., the piping, cooler, pressure gauges, needle valve,
pressure regulator, suction and discharge by-pass valves, pumping
sleeve, bushing and lip seal are shown.
In figure 9., the shaft-mounted pumping assembly is shown.
Figure 12 & 13. illustrate the use of a tapper bore spring-loaded
pumping sleeve and bushing face-to-face contact for positive
pumping action.
Figure 14 & 15. shows a cross-section and installation of a pumping
sleeve and bushing for small bore stuffing box.

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