Gear pump
AssigneeMaag Pump Systems AG
InventorsAlfred K. Hunziker, Fritz Haupt, Eduard Mischler, Stefan Kalt
Life of this patent
Estimating the term…
Abstract
Method and apparatus for on-site cleaning of a gear pump by coupling the gear pump outlet to the gear pump inlet and to the inlet end of the passage and which bypasses the bearing and is preferably controlled by a valve element which can block off the bypass in normal operation and be opened for a cleaning operation to increase the pressure on the side of the bearing connected to the inlet and thereby increase the velocity of the flushing stream.
Claims23
A gear pump comprising:
- a housing (30) provided with an inlet channel (4) and an outlet channel (6);
- a plurality of gear bodies (32, 34) having bearing journals (36);
- bearings for rotatably supporting said bearing journals and hence said gear bodies in the housing;
- said bearings having a high pressure side disposed towards said gear bodies and a low pressure side disposed towards ends of said bearing journals;
- a system of passages (8), which includes said bearings, being connected to the outlet channel to permit circulation of a leakage stream of product being conveyed, characterized in that the system of passages includes at least one adjustable valve element (22), for varying flow on the low pressure side (16, 46) of said bearings.
A method for lubricating a gear pump comprised of a housing provided with an inlet channel and an outlet channel, a plurality of gear bodies having bearing journals and bearings for rotatably supporting said bearing journals and hence said gear bodies in said housing, said gear pump having passages including said bearings, said method comprising the steps of:
- introducing a leakage stream of the medium conveyed by the gear pump outlet channel to the bearings;
- returning said leakage stream flowing through the bearing passages to the inlet channel;
- adjusting the flow conditions on the side of the bearing connected to the inlet channel;
- adjusting the flow conditions as a function of the medium being conveyed;
- and
- providing a leakage flow of a flushing agent different from the product normally handled through the bearings when cleaning the gear pump and adjusting the amount of leakage flow of the flushing agent.
A method for lubricating a gear pump comprised of a housing provided with an inlet channel and an outlet channel, at least two gear bodies having bearing journals and bearings for rotatably supporting said bearing journals and hence said gear bodies in said housing, said gear pump having passages including said bearings, said method comprising the steps of:
- introducing a leakage stream of the medium conveyed by the gear pump outlet channel to the bearings;
- returning said leakage stream to the inlet channel;
- adjusting flow conditions of a stream of medium from said outlet channel to said bearings by flow adjusting means being adjusted independently of the operating characteristics of said gear bodies;
- providing a flow of a flushing agent different from the product normally handled through the bearings when cleaning the gear pump and adjusting a flow amount of the flushing agent by adjusting the flow conditions wherein adjusting the flow of said flushing agent includes adjusting a leakage stream of said flushing agent so that it is different from that of the product.
A gear pump comprising:
- a housing (3) provided with an inlet channel (4) and an outlet channel (6);
- at least two gear bodies (32, 34) having bearing journals (36);
- bearings for rotatably supporting said bearing journals and hence said gear bodies in the housing;
- said bearings having a high pressure side disposed towards said gear bodies and a low pressure side disposed towards ends of said bearing journals;
- and
- a system of passages (8), which includes at least one of said bearings, being connected from the outlet channel to its high pressure side and comprising valve means adjustable independently of the gears during operation of said pump.
Dependencies are inferred from the claim text.