Pump sealing device
AssigneeSociete Anonyme dite: Compagnie Generale d'Automatisme
InventorAndre Salaun
Life of this patent
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Abstract
A pump sealing device includes a packing box whose packing (3) is disposed around a drive shaft (2) of the pump where the shaft passes through the pump body (1). The packing is acted on by a gland (4). At least two levers (5), each of which pivots on a respective pin (6), are arranged so that one end of each lever is able to exert a predetermined pressure on said rammer as soon as the pump stops and conversely to reduce the pressure to zero or substantially zero before the pump is started. The other ends of the levers are linked to means (8) to cause the levers to rotate about the pins. The device can be used in any type of pump, and in particular in pumps for corrosive liquids.
Claims7
A pump shaft sealing device for a pump having a body, a drive shaft extending from the body, and a motor operatively connected to the drive shaft, the device including a stuffing box surrounding the drive shaft where it passes through the pump body, packing disposed in the stuffing box, a packing gland for compressing the packing against the shaft, and means for adjustably pressing the gland against the packing, wherein the improvement comprises:
- said means for adjustably pressing the gland against the packing includes
- at least two levers disposed radially with respect to the axis of the drive shaft in equiangularly spaced relation to each other, each lever having an inner end and an outer end and being pivotally mounted for rotation about an axis located intermediate the inner and outer ends and tangent to a circle concentric with the drive shaft;
- drive means coupled to the outer end of each lever for rotating the lever about its pivot axis so as to selectively move the inner end of the lever toward and away from the packing gland;
- and
- means for automatically actuating each drive means to cause the inner end of the respective lever to exert a predetermined axial force on the packing gland as soon as the pump motor stops and to release said force before the pump motor starts.
Dependencies are inferred from the claim text.