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Pump device for the hydraulic actuation of a valveRelated Patent Categories: Pumps, Motor Driven, Electric Or Magnetic Motor, Reciprocating Rigid Pumping MemberPump device for the hydraulic actuation of a valve description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20060159569, Pump device for the hydraulic actuation of a valve. Brief Patent Description - Full Patent Description - Patent Application Claims
CROSS-REFERENCE TO RELATED APPLICATION [0001] The present application claims priority to PCT/EP2004/007948 filed 16 Jul. 2004 and to German Application No. 203 11 033.1 filed 17 Jul. 2003, all hereby incorporated herein by reference. STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT [0002] Not Applicable. BACKGROUND OF THE INVENTION [0003] The invention relates to a pump device for the hydraulic actuation of a valve, especially employed in the production of crude oil or natural gas, as a safety valve assigned to a pipeline or to a tree, with a piston-cylinder unit from which hydraulic fluid can be pumped under pressure in the direction of the valve. [0004] Corresponding pump devices are known from practice, which are generally arranged far away from the actual valve and do not just supply it with hydraulic fluid, but also other equipment, in particular for crude oil or natural gas production. The appropriate valve is in this respect assigned to a pipeline or similar facility as a safety valve and is generally termed a downhole safety valve. In marine crude oil or natural gas production it is arranged along the pipeline and below the surface of the sea and is used for closing the pipeline in the case, for example, of a leak or similar problem. [0005] With such safety valves it has however been found that often a leak occurs and already after a relatively short time a corresponding hydraulic fluid has run out, even out of a corresponding storage container. In addition a hydraulic fluid under pressure cannot be passed specifically to a certain safety valve at the point of application or relatively near to the safety valve, but rather generally long hydraulic fluid pipes are required, whereby at the most an appropriate reservoir for hydraulic fluid is arranged where applicable at the point of application at the safety valve. However, also here the appropriate leakage problems occur. SUMMARY OF THE PREFERRED EMBODIMENTS [0006] The object of the invention is to improve a pump device of the type mentioned at the beginning such that the hydraulic fluid pressure, in particular at the point of application and in the vicinity of the actual valve, can be constructively simply produced in a safe and controlled manner. [0007] This object is solved by the pump device with the features of claim 1. [0008] According to the invention an electrical drive device is used which is movably connected to the appropriate piston of the piston-cylinder unit for its alternating movement in the piston longitudinal direction within the associated cylinder. Through the electrical drive device an electrically driven pump device pumping hydraulic fluid is provided which can specifically feed hydraulic fluid to a safety valve, whereby the corresponding pressure of the hydraulic fluid can be set and monitored by means of the electrical drive device. [0009] The electrical drive device in this respect exhibits sufficient power to generate adequate hydraulic pressure for the valve. The drive device can be actuated and its activity monitored by means of appropriate electrical connecting lines. [0010] Preferably according to the invention an electrical drive device can be used which exhibits a spindle drive, a reduction gear, a spur gear and at least one drive shaft with at least one electric motor to turn it. Through this combination of subgroups an electrical drive device is produced which operates extremely free of maintenance and can be controlled and regulated accurately and can also be used for many other devices in the production or mining of crude oil and natural gas. [0011] The rotational speed of the electric motor is reduced by the reduction gear, spur gear and also the spindle drive so far that also slight piston displacements are possible. Consequently the hydraulic pressure or the quantity of the hydraulic fluid, which is pumped through the pump device in the direction of the valve, can be set extremely precisely. [0012] In order to adapt the spindle drive in a simple manner to the alternating movement of the pistol in the piston longitudinal direction, the spindle drive can exhibit a rotatable, but axially immovable spindle nut and an axially movable threaded spindle. [0013] The corresponding axial movement of the threaded spindle can be converted into a movement of the piston in the piston longitudinal direction. [0014] With a simple embodiment the threaded spindle can be releasably joined at its actuating end to the piston. In this way other intermediate components can be omitted, whereby the construction of the pump device is extremely compact. [0015] A low-wear and heavy duty reduction gear, which also contributes to the compactness of the pump device according to the invention, can be seen in that the spindle nut is movably connected to the reduction gear, which is in particular formed as a so-called harmonic drive gear. [0016] In this connection there is the possibility that the spindle nut is rotationally rigidly joined to a flexible, cup-shaped toothed sleeve of the harmonic drive gear. This connection can occur directly or through the intermediate placement of another component. Preferably, in this connection a rotating sleeve can be arranged between the toothed sleeve and the spindle nut, the rotating sleeve being rotationally rigidly connected at one end to the toothed sleeve and at the other end to the spindle nut. [0017] This rotating sleeve is for example supported rotationally by means of oblique roller bearings inside the pump device. [0018] Apart from the toothed sleeve, a harmonic drive gear generally exhibits a wave generator and a rotationally rigid ring element. The wave generator is arranged inside the toothed sleeve and deflects it so far radially outwards at two opposite points due to its flexibility that outer teeth on the toothed sleeve engage inner teeth on the fixed ring element at these two opposite points. [0019] In this way the wave generator of the harmonic drive gear can be rotationally rigidly joined to a first spur wheel of the spur gear, whereby a second spur wheel is arranged rotationally rigidly on the drive shaft which is driven by at least one motor. [0020] This type of spur gear is also extremely low-wearing, is characterised by a high efficiency and can, where applicable, be formed to be self-locking and self-braking. One possibility for this type of spur gear is a double helical gear. Continue reading about Pump device for the hydraulic actuation of a valve... Full patent description for Pump device for the hydraulic actuation of a valve Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Pump device for the hydraulic actuation of a valve patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. 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