Pumps – Combined
Reexamination Certificate
2000-02-04
2001-11-27
Freay, Charles G. (Department: 3746)
Pumps
Combined
C417S410400, C418S206100
Reexamination Certificate
active
06322329
ABSTRACT:
FIELD OF THE INVENTION
This invention relates to a hydraulic pump, in particular a hydraulic pump of an electro-pump unit, of a type comprising a pump body enclosing a gear pump and provided with a suction aperture for aspirating a low pressure liquid and an outlet chamber which communicates with an outlet channel for driving back a high pressure liquid, connected to a user hydraulic circuit, and a hydraulic capacity for a dampening of pulses that are generated by the pump and equipped with deaerating means for a draining of the air able to be trapped therein. The invention relates also to an electro-pump unit equipped with a pump according to the invention.
BACKGROUND OF THE INVENTION
Hydraulic pumps of the above type are already known, in which the deaerating means are formed as a valve which enables the trapped air to be drained into a low pressure liquid tank surrounding the capacity. This solution has the drawback that it implies establishement of a low pressure communication between the capacity and the tank, which can in case cause in particular an air suction effect toward the capacity when a level of the liquid in the tank is under a level of the valve.
PURPOSE AND SUMMARY OF THE INVENTION
The invention has for its purpose to cope with the above drawback.
To reach this purpose, the hydraulic pump according to the invention is characterized in that the aerating means are formed by the high pressure liquid driven by the pump back into the outlet channel.
According to another feature of the invention, the hydraulic capacity is serially arranged in the flow path of the high pressure liquid, whereby the air which is stored in the capacity will be expelled by the driven back liquid.
According to another feature of the invention, the hydraulic capacity is above the driving back chamber and an aerating tube is extended from top of the hydraulic capacity to the driving back channel.
According to still another feature of the invention, the high pressure outlet is provided in an interface block between the pump and the driving motor thereof.
According to still another feature of the invention, the hydraulic capacity is formed by a dome shaped cover arranged directly on the upper face of the pump body so that the lower face of the cover will close the pump body with insertion of sealing gaskets in the contacting faces of the cover and pump body.
REFERENCES:
patent: 1944340 (1934-01-01), Zubaty et al.
patent: 4134549 (1979-01-01), Perr
patent: 4324276 (1982-04-01), Kemner
patent: 4355964 (1982-10-01), Rodibaugh et al.
patent: 6048187 (2000-04-01), Hamasaki et al.
patent: 6158983 (2000-12-01), Harpole et al.
patent: 657185 (1938-02-01), None
patent: 2832299 (1980-01-01), None
patent: 3014280 (1981-10-01), None
patent: 4025910 (1991-06-01), None
patent: 19816173 (1998-10-01), None
patent: 7210465 (1972-10-01), None
patent: 481084 (1938-03-01), None
patent: 987587 (1965-03-01), None
patent: 2220035 (1989-03-01), None
Browdy and Neimark
Freay Charles G.
Hydroperfect International
Torrente David J.
LandOfFree
Hydraulic pump of the gear type and electro-pump equipped... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Hydraulic pump of the gear type and electro-pump equipped..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Hydraulic pump of the gear type and electro-pump equipped... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2581578