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Reciprocating pump and use of said reciprocating pumpRelated Patent Categories: Pumps, Expansible Chamber Type, Moving CylinderReciprocating pump and use of said reciprocating pump description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20070025867, Reciprocating pump and use of said reciprocating pump. Brief Patent Description - Full Patent Description - Patent Application Claims
BACKGROUND OF THE INVENTION [0001] The invention relates to a reciprocating pump with at least one piston arranged axially displaceably in a casing, with a rotatably mounted drive shaft for driving the piston, with an inlet channel and with an outlet channel. The invention relates, furthermore, to an advantageous use of the reciprocating pump. [0002] The reciprocating pumps known from practice mostly have as drive shaft a crankshaft connected to the piston via a connecting rod. The inlet channel and the outlet channel each have valves. The valves may be positively controlled via a camshaft or have a spring element and be controlled via the pressure generated in the casing by the piston. A very high feed volume at a high feed pressure can be generated by means of an intended diameter and stroke travel of the piston and rotational speed of the drive shaft. The known reciprocating pump has the disadvantage that it has a very large construction space and a highly complicated construction. [0003] To simplify the construction of the reciprocating pump, it is known, for example from DE 0 855 488, to drive the piston via a compensating drive. The pressure feed is achieved by means of the actual movement of the piston. A regulating control pressure piston executes a combined rotational and reciprocating movement and has a control groove on its outer surface area. This reciprocating pump has the disadvantage that it is of likewise highly complicated construction and is suitable only for low feed quantities. [0004] The problem on which the invention is based is to design a reciprocating pump of the type initially mentioned in such a way that it is constructed in a particularly simple and compact way and makes it possible to have high feed capacity at a high feed pressure. Furthermore, advantageous use of the reciprocating pump is to be provided. BRIEF DESCRIPTION OF THE INVENTION [0005] The first mentioned problem is achieved, according to the invention, in that the drive shaft has a control curve with at least one upper reversal point and one lower reversal point, in that the piston is guided in the control curve, and in that a transmission element extends from the piston through an elongated guide in the casing into the control curve. [0006] As a result of this configuration, the direction of movement of the piston can be arranged parallel to the drive shaft, thus allowing a particularly compact construction of the reciprocating pump. In the simplest instance, the control curve is configured sinusoidally over the circumference of the shaft and has in each case an upper and a lower reversal point. In the event of a rotation of the drive shaft over 180.degree., the piston is consequently moved in one direction, and, in the event of rotation over the next 180.degree., the piston is moved in the opposite direction. By virtue of this configuration of the control curve, the piston is driven in the same way as the piston connected to the crankshaft via the connecting rod. The feed pump according to the invention therefore has a high feed volume at a high feed pressure. A connecting rod mounted on the piston and mounted on the drive shaft is avoided by virtue of the invention. The reciprocating pump according to the invention therefore requires particularly few components to be mounted and consequently has a very simple construction. Preferably, the direction of movement of the piston is arranged parallel to the axis of rotation of the drive shaft. The piston of the reciprocating pump according to the invention may be sealed off with respect to the casing, for example, via sealing rings or via a diaphragm. [0007] According to an advantageous development of the invention, a rotation of the transmission element can be prevented in a simple way if the transmission element is led through an elongated guide in the casing. [0008] The reciprocating pump according to the invention requires only a single control curve for a plurality of pistons if a plurality of pistons are arranged concentrically with respect to the drive shaft. [0009] The inlet channel could be arranged, for example, in the casing and have a control valve or be controlled by the movement of the piston. However, according to an advantageous development of the invention, the reciprocating pump according to the invention has a particularly compact configuration when the inlet channel passes through the piston and has a nonreturn valve. The outlet channel preferably has a nonreturn valve in the casing in the same way as known reciprocating pumps. [0010] The reciprocating pump according to the invention has a particularly low axial construction height if the nonreturn valve of the inlet channel and/or a nonreturn valve of the outlet channel are/is designed as a diaphragm valve. [0011] A contribution is made to a reduction in the radial dimensions of the reciprocating pump according to the invention when the nonreturn valve of the inlet channel and/or the nonreturn valve of the outlet channel have/has a valve body guided longitudinally displaceably and located opposite a valve seat. To assist the movements, the valve body may be prestressed relative to the valve seat by a spring element. In an instance which is particularly simple in structural terms, the valve bodies can be controlled, even without spring force, by the pressure in the casing. [0012] According to another advantageous development of the invention, the manufacture of the piston requires a particularly low outlay if a recess provided in the piston for receiving the transmission element has a peripheral groove. The peripheral groove may in this case, for example, be of rectangular or trapezoidal design or have a segment of a circle. [0013] The piston could, for example, be manufactured in one piece with a transmission element. However, according to another advantageous development of the invention, the piston can be manufactured particularly simply, without radially projecting components, when the piston has a pocket, shaped correspondingly to the transmission element, for receiving a part region of the transmission element. By virtue of this configuration, the piston is secured against rotation, and the connection between transmission element and piston can be mounted, for example, hydrostatically. A further advantage of this configuration is that, by means of the pocket, a surface support of the transmission element can be achieved, in contrast to the recess being designed as a peripheral groove. The reciprocating pump according to the invention consequently has particularly low wear. The pocket may be designed, for example, as a cylindrical bore or a conical bore or have a form of a spherical cap corresponding to the transmission element. Furthermore, the transmission element can be pressed into the pocket, and consequently a relative movement of the piston with respect to the transmission element can be avoided. This leads to a further reduction in the wear of the reciprocating pump according to the invention. [0014] The reciprocating pump according to the invention can be composed of particularly cost-effective components if the transmission element is designed as a ball. Preferably, in this case, the control curve of a cross section is designed as a partial circle. [0015] According to another advantageous development of the invention, a rotation of the transmission element can be reliably avoided if the transmission element is designed as a rotationally symmetrical sliding block. The control curve preferably has in this case a rectangular or trapezoidal cross section. [0016] The reciprocating pump according to the invention has a particularly simple structural configuration when the guide in the casing is arranged on a straight line connecting the axes of symmetry of the piston and of the drive shaft. [0017] According to another advantageous development of the invention, the transmission element can be provided with particularly large dimensions, without this contributing to increasing the radial dimensions of the reciprocating pump according to the invention, if the guide in the casing is arranged outside the straight line connecting the axes of symmetry of the piston and of the drive shaft. [0018] According to another advantageous development of the invention, a play of the transmission element in the guide of the casing or in the control curve can be compensated in a simple way if lateral bearing faces of the guide of the transmission element in the casing and/or of the control curve are prestressed relative to one another. As a result, the transmission element is guided particularly accurately, and therefore wear is kept particularly low. [0019] According to another advantageous development of the invention, the control curve can have a particularly long configuration if the drive shaft has, in the region of the piston, a rim surrounding the piston at least partially radially on the outside and the control curve is arranged on the rim radially on the inside. The drive shaft consequently surrounds the piston. [0020] The control curve, of particularly long configuration, is subject to particularly low wear. [0021] The contribution to a further reduction in the wear of the control curve is made when the piston is arranged between two control curves one radially surrounding the other concentrically. [0022] According to another advantageous development of the invention, the drive shaft can be operated at a particularly low rotational speed if the control curve has a plurality of upper and lower reversal points over the circumference of the drive shaft. Continue reading about Reciprocating pump and use of said reciprocating pump... Full patent description for Reciprocating pump and use of said reciprocating pump Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Reciprocating pump and use of said reciprocating pump patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. 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