Pumps – Expansible chamber type – Valved piston
Patent
1998-02-13
2000-12-26
Freay, Charles G.
Pumps
Expansible chamber type
Valved piston
4175552, 1375121, F04B 3910, F16K 1500
Patent
active
061649368
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a vertical reciprocating pump for raising fluids which are present in the ground.
A vertical reciprocating pump of this type is already known, in particular as described in document OAPI 06 221 of Mar. 23, 1979. Pumps of this type are designed to pump fluids which are present in the ground, such as underground waters, petroleum etc.
The known vertical reciprocating pumps, which are designed to pump water, are operated manually. According to the depth of the fluid table they consist either of a rod or a vertical set of rods which support one or a plurality of flap-valve pistons.
The known pistons generally consist of a cylinder of a specific length, which is provided on its periphery along one of its edges, and in particular the upper edge, with a gasket which slides in the raising tube.
This part of the cylinder is engaged in a sliding manner on a body, which for example consists of ribs and ends at its base in a flap valve. When the cylinder of the piston descends on the flap valve, the piston is sealed. In the opposite case the fluid can pass through the piston. These two different positions between the cylinder and the flap valve correspond respectively to the movement of descent of the piston in the water column contained in the cylinder of the pump body or raising tube, and to the movement of raising of the fluid column above the piston.
A multiple piston pumping device is also known (FR-88 09 575) in which the piston consists of a cylinder, the base of which has a so-called alveolar structure. This cylinder is fitted onto the rod which controls the reciprocating motion. Above the alveolar base there is provided a lifting flap valve which is maintained supported against the alveolar structure by a tubular component. This tubular component passes through the interior of the cylinder and is supported against a stop which is integral with the rod. Below the piston, i.e. below the alveolar base of the cylinder, a nut and counternut are provided to lock the assembly.
The cylinders of the known pistons have the disadvantage that they rub substantially on the inner surface of the raising column, and this friction increases when the raising tube sustains deformations as a result of movements of the ground, since the piston is then forced to follow this deformed path.
The gasket along the upper edge of the cylinder, which is applied against the inner wall of the raising tube or the cylinder, itself increases this friction as a result of the pressure exerted by the fluid column against the gasket and the cylinder.
The fluids which are pumped are often loaded, and eventually particles are deposited on the seats of the flap valves of the piston. The pistons thus lose their sealing, which decreases the flow of fluid pumped. Consequently the pistons must be replaced frequently, which increases the operating cost of the pump.
Since the flap valve is a wear part, it becomes worn and may need to be replaced. In this case, the piston assembly must be dismantled in order to access the flap valve, remove the flap valve to be changed, and put into place the new flap valve. For this purpose it is necessary to remove the piston completely from the rod in order to be able to fit the new flap valve.
This constitutes a relatively lengthy operation for replacement of a very simple part.
In addition, since the flap valve is located in the cylinder, when the pump is stopped the solid particles in suspension in the water which are continued in the piston are gradually deposited on the base. Since the piston is not perfectly sealed, the water leaks out and carries with it the solid particles in suspension which can be deposited between the edge of the diaphragm and the inner wall of the piston, during the interval necessary in order to allow the flap valve to be raised without rubbing against the piston.
This situation is disadvantageous for pistons which are not immersed; if for any reason the pump is stopped for a given time, i.e. for a few hours or a few days, the solid particles then block the v
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patent: 25367 (1859-09-01), Poole
patent: 274308 (1883-03-01), George
patent: 378848 (1888-02-01), Normand
patent: 949423 (1910-02-01), Garber
patent: 1175543 (1916-03-01), Molinder
patent: 1362838 (1920-12-01), Brandt
patent: 3752604 (1973-08-01), Dorn
patent: 4951706 (1990-08-01), Kardos
patent: 5285847 (1994-02-01), Halper et al.
Freay Charles G.
Gray Michael K.
Sorelec
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