摘要:
The invention relates to a method for dosing a lubricant as well as a lubricant dosing pump. To be able to accurately dose the small lubricant quantities necessary in minimal quantity lubrication, it is provided according to the invention that at least two pistons are moved from an initial position relative to one another, thereby enlarging a dosing volume situated between them, and that thereby lubricant is conveyed through an inlet into the closing volume. Subsequently, the inlet is sealed and the two pistons situated opposite to each other in the stroke direction are moved together with the dosing volume until in a discharge position the dosing volume is connected with a discharge opening spaced apart from the inlet in the stroke direction. Then, the pistons are moved relative to each other, thereby reducing the dosing volume, and convey a predetermined dosing quantity of the lubricant through the discharge opening. Finally, the pistons are moved back into their initial positions. In particular, the dosing volume can be reduced to zero by moving both pistons relative to each other until they touch each other.
摘要:
A blade valve for a compressor comprises two discs which are arranged one above the other with the interposition of a seal. The discs are provided with ducts for the controlled medium and form both the valve seat and the catcher. In the seal, whose thickness determines the valve stroke, elongate recesses are provided for the blades which control the passage ducts. At the ends of the recesses, stepped stops are provided in the seal for the ends of the strip-like blades which are loosely inserted into the recesses. The stepped stops may be formed by profiled strips which are inserted at the ends of the recesses and which extend transversely to the longitudinal direction of the blades.
摘要:
A piston for internal combustion engines, especially for high-performance internal combustion engines. The piston has several ring grooves for piston rings, and an oil control groove which is provided below the top ring groove, is separated therefrom, and opens only towards the cylinder bore. The land between the topmost ring groove and the oil control groove, seen in cross section, is designed as a support having constant bending stress and has a finite height at its outer surface. The inner confine of the oil control groove has a finite radius or rounded-off section to avoid an increased stress concentration factor.
摘要:
An intake control valve for a screw-type compressor is built into the intake line, which it alternatingly opens or closes. The intake control valve, designed as a double seat valve, has a locking body (17), to which are assigned two opposing valve seats, namely a return flow seat (7) and an intake seat (9). Upon starting the screw-type compressor, the locking body (17) is pulled onto the intake seat (9) by means of the resulting intake pressure. As soon as a specific operating pressure is reached, the locking body (17) is lifted from the intake seat (9) by means of the pressure medium by way of a control cylinder (10) with a control piston (11) and moved into an intermediate position between its two seats (7, 9), so that the screw-type compressor can totally transport. As soon as the screw-type compressor is turned off, a weak spring (18) braced against the valve housing (1) pushes the locking body (17) onto the return flow seat (7) and closes it sealingly, so that neither pressure medium nor oil injected for lubricating the screw-type compressor can flow back into the intake line.
摘要:
A cover for a housed thermostat having a thermostat valve which is held on the cover, forms a main valve and a short-circuit valve and contains a thermostatic working element whose housing is connected with the main valve disk. The cover has a projection which surrounds the housing of the working element in a cage-type manner and is molded to the main valve disk which is manufactured as a molded plastic part. The end of the projection projects over the housing of the working element and forms part of the short-circuit valve.
摘要:
In a piezoelectric valve the actual control member (7) is formed by a displacer fluid motor (9) though which the fluid stream (5) flows. A piezoelectric actuating element (8) is disposed in the region of a displacer element (1), which can be moved by the fluid stream (5) and belongs to this fluid motor (9), and acts exploiting the inverse piezo effect during electric actuation to at least indirectly block or release this displacer element (1). The fluid motor (9) is formed preferably by a rotating piston machine, such as a gear pump.
摘要:
A fluid cylinder control method for monitoring the position or controlling the movements of a piston which is slidably guided in a cylinder tube and is acted upon on at least one side by a pressure medium, in particular, maintaining the piston in a predetermined position against the action of eventual disturbance forces. This is attained in that the force which is transmitted between the piston and the cylinder by way of the parts which are slidingly guided on each other, and in particular the friction force acting by way of the seal gaskets of the piston and/or of the rod, is measured and the loading of the piston by a pressure medium is varied in the sense of reducing the measured force.
摘要:
A spring plate for transmitting or storing forces is made of plates of material by punching and has radial webs connected in meander form by peripheral bridges. The radial webs between successive bridges are separated by narrow slots whose width, measured when the spring plate is in the flat state, is at least 10% less than the thickness of the spring-plate material, so that a maximum number of radial webs can be accommodated round the periphery of the spring plate.
摘要:
A device for regulating the delivery of rotary compressors, such as screw-type compressors with oil injection, comprises a regulating valve for varying the cross-sectional area of a suction pipe and a non-return valve which closes said suction pipe. The two valves are disposed one behind the other in the flow direction within a casing incorporating a suction pipe. In order to provide a low resistance to flow and to simplify the construction, both valves are in the form of flap valves with the flap of the non-return valve arranged to close a valve seat provided in the casing and being pivotable against a resetting force about an axis extending outside the cross-sectional area of the valve seat.
摘要:
In the case of a thermostatic valve for a coolant control of an internal-combustion engine, it is provided that a connecting element is provided which is made of a material having a low thermal conductivity so that a thermal uncoupling takes place between the valve housing part of the thermostatic valve and a thermostatic valve element which is mounted on it and is to be arranged outside the coolant flow.