摘要:
The invention relates to a pump device comprising a pump piston (12) which is longitudinally movable in a pump housing (10) and which, controlled by a magnetic actuation apparatus (14), acts on an inlet valve (16) and an outlet valve (18), the inlet valve (16) opening during the intake stroke of the pump piston (12), and the outlet valve (18) opening during the delivery stroke thereof. The inlet valve (16) has an annular valve piston (20) which encompasses the pump housing (10) which has an entry point (22) and an exit point (24) for fluid. The valve piston (20) has a pressure-sensing surface (26) which is controlled by the pump piston (12) in such a way that, during the intake stroke, the pressure-sensing surface (26) of the valve piston (20) is moved counter to the action of an energy store (28) in the movement direction of the pump piston (12) and in the process vacates a fluid path into a pump chamber (30) of the pump housing (10) by means of the pump piston (12) and, during the delivery stroke, the valve piston (20) of the inlet valve (16), under the action of the energy store (28) and the pressure-sensing surface (26), blocks this fluid path and opens the outlet valve (18).
摘要:
According to one embodiment, there is provide a piston pump, including: a cylinder having a bottomed cylindrical shape; a piston slidable within the cylinder, the cylinder and the piston defining a pressure chamber therebetween; a suction valve unit disposed in a suction passage of the pressure chamber; and a discharge valve unit disposed in a discharge passage of the pressure chamber, wherein the piston includes a cylindrical piston portion and a large diameter piston portion provided to cover one end of the cylindrical piston portion, and wherein the large diameter piston portion includes a working fluid guide groove extending thereinside along the axial direction of the piston.
摘要:
An electromagnetic pump includes a coil, a cylinder and piston assembly, a biasing mechanism biasing the piston towards a first position, a seal and a valve. The piston, having a cavity inside and an aperture in a first end, can move linearly between a first position and a second position within the cylinder. The piston is also positioned within a magnetic field the coil generates when it conducts a current, and the magnetic field can force the piston to move towards the second position. The valve includes a single cap that can move between a first position and a second position. When in its second position, the single cap allows fluid to pass through the aperture; and when in its first position, it is arranged to fluidly seal the aperture to prevent the flow of fluid from an outlet conduit to an interface between the piston and the cylinder.
摘要:
This invention provides a fluid pump using perforate elements and closure elements which are alternately displace and relates particularly but not exclusively to miniature fluid pumps and pumps suitable for delivery of liquid pharmaceutical formulations. In the art of miniature liquid pumps are known pumps based on peristaltic and nullpump chambernull principles. (Peristaltic pumps may be used to pump fluids in general, that is, liquids or gases). Both types of pump are used in ambulatory pump products for delivery of liquid medicaments, for which application miniaturization and low weight are important attributes.
摘要:
A pumping system comprises a pump barrel that is adapted to be placed into a well casing. A plunger is reciprocatably positioned within the pump barrel and has an open top end, a bottom end, and a traveling valve at the bottom end. A connector is coupled to the plunger below the top end. A rod is coupled to the connector and is translatable to reciprocate the plunger within the pump barrel using an upstroke and a downstroke. Further, the top end of the plunger is adapted to direct particulate into the plunger and away from the pump barrel upon each upstroke.
摘要:
A miniaturized device for pressurizing fluid. The device includes a hollow piston that provides a fluid path and a valve member. The valve member is configured for axial movement so that the valve axis remains parallel to the piston axis. The valve member is arranged at one end of the hollow piston. The valve member may be partially or completely disposed within the hollow piston. The device is particularly adapted for use in a mechanically operated atomizer to produce an inhalable aerosol of a liquid medicament without the use of propellant gas.
摘要:
A miniaturized device for pressurizing fluid. The device includes a hollow piston that provides a fluid path and a valve member. The valve member is configured for axial movement so that the valve axis remains parallel to the piston axis. The valve member is arranged at one end of the hollow piston. The valve member may be partially or completely disposed within the hollow piston. The device is particularly adapted for use in a mechanically operated atomizer to produce an inhalable aerosol of a liquid medicament without the use of propellant gas.
摘要:
The invention relates to a piston pump, having a piston that has a longitudinal bore, that includes a valve seat face upon which a valve closing body is pressed by a valve spring. The valve spring is a helical compression spring, whose winding diameter increases from a winding end that engages the valve closing body to a winding end that rests on a spring seat face formed in the longitudinal bore of the piston. The piston pump of the invention has the advantage that the valve closing body along with the valve spring can be installed in the piston in an axial motion; the valve spring is directly accessible, and a correct seating of the valve and valve spring in the longitudinal bore can be checked visually after installation.
摘要:
The present invention provides a pumping system having separate parallel power tubing and production tubing strings in which production is pumped up the production tubing through a removable flow control valve and a rod operated insertable and removable pump is disconnectably connected into the power tubing wherein the insert type pump and the removable flow control means may be removed from and inserted into, respectively, the power tubing and the production tubing strings without the need to remove either tubing string from the well.
摘要:
Pumping in oil wells and like application is carried out in a noiseless manner with efficient utilization of energy by raising the plunger or piston in a subsurface pump piston with a long metal rod or cable capable of undergoing memory shape change as a function of a martensitic transformation when worked by application of stress, preferably by gravity through an attached weight, while cold to elongate itself and, upon application of heat thereto, reversing the transformation and contracting in length to raise the piston and associated equipment plus fluid load.