Valve Passage Directly Connecting Concurrently Contracting And Expanding Nonrotary Pump Chambers Patents (Class 417/285)
  • Patent number: 11199187
    Abstract: A plunger pump, comprising: a liquid tank; a pump body including a liquid storage part, a suction passage configured to allow communication between the liquid storage part and the liquid tank and a discharge passage configured to discharge a liquid in the liquid storage part to outside; and a plunger reciprocally movably supported in the pump body so that a tip reaches the liquid storage part. The suction passage includes a first suction passage, the tip of the plunger being reciprocally slidably inserted into the first suction passage, and a second suction passage provided in parallel to the first suction passage, and a check valve configured to allow only a flow of the liquid from the liquid tank to the liquid storage space is disposed in the second suction passage.
    Type: Grant
    Filed: November 7, 2018
    Date of Patent: December 14, 2021
    Assignees: NITTOKU CO., LTD., NAKA LIQUID CONTROL CO., LTD.
    Inventors: Norio Oda, Yasuhiro Tanaka, Takahiro Sato, Yuji Kanbayashi
  • Patent number: 10641389
    Abstract: An HST control mechanism includes a rotary member, a servo unit, a telescopic member, and a biasing device. The rotary member for controlling a displacement of a hydrostatic transmission (HST) is pivoted outside of a casing incorporating the HST. The servo unit includes a telescopically movable actuator and a valve controlling the telescopic movement of the actuator. The actuator is interlockingly connected to the rotary member. The servo unit is pivotally supported on the casing via a first pivot. The servo unit rotates centered on the first pivot as the rotary member rotates according to the telescopic movement of the actuator hydraulically controlled by the valve. The telescopic member is pivotally supported on the casing via a second pivot. The telescopic member is provided with the biasing device that biases the telescopic member and the rotary member toward a position corresponding to a neutral state of the HST.
    Type: Grant
    Filed: July 14, 2017
    Date of Patent: May 5, 2020
    Assignee: Kanzaki Kokyukoki Mfg. Co., Ltd.
    Inventors: Jun Matsuura, Koji Iwaki, Tomoyuki Tsuji, Minoru Kamada, Hideki Kanenobu, Kengo Sasahara
  • Publication number: 20110103976
    Abstract: Apparatus (1) for providing a supply of natural gas fuel comprising a compressor (2) having an inlet (3) for a stream of natural gas (4), wherein the inlet (3) may be placed in fluid communication with an LNG storage tank (5) in order to provide a supply of boil-off gas (6) from out of the LNG storage tank (5), and an outlet (7) which may be placed in fluid communication with a natural gas supply pipe (8), characterised in that the compressor (2) comprises a first and subsequently a second compression stage (9, 10), wherein the first and the second compression stage (9, 10) take the form of labyrinth-sealed piston-compressors (11, 12) or piston-ring-sealed piston-compressors (15), and wherein the first compression stage (9) features a larger piston diameter than the second compression stage (10), and that the compressor (2) comprises at least a third subsequent compression stage (13, 14), which takes the form of a piston-ring-sealed piston-compressor (11, 12) or a labyrinth-sealed piston-compressor (15).
    Type: Application
    Filed: March 10, 2009
    Publication date: May 5, 2011
    Inventor: Besim Fejzuli
  • Patent number: 7090472
    Abstract: Pump or motor having a rotor with chambers with a through rotation variable volume which are connectable via switches to either a first line connection or a second line connection. During switching between the line connections, the volume of the chamber changes and to avoid pressure peaks or cavitation the chambers are interconnected with connecting lines. Each connecting line has closures to stop the flow through the connecting line after a limited volume of fluid has passed in one direction.
    Type: Grant
    Filed: May 29, 2003
    Date of Patent: August 15, 2006
    Assignee: Innas Free Piston B.V.
    Inventor: Peter A. J. Achten
  • Publication number: 20020071771
    Abstract: A hydraulic drive system for providing a smoothed or near sinusoidal output flow characteristic for reciprocating piston pumps. The device occupies a smaller footprint than conventional mechanical reciprocating pumps and allows a standard reciprocating pump to operate at its maximum rated pressure while retaining its maximum rated flow. Several embodiments are disclosed and the drive system may be coupled to standard duplex and triplex pumps. A solution to hydraulic hammer caused by rapid flow reversal in the hydraulic control valves used within the system is presented.
    Type: Application
    Filed: December 10, 2001
    Publication date: June 13, 2002
    Inventor: Cory L. Miller
  • Patent number: 5573381
    Abstract: A dual-piston fuel pump assembly includes a housing having an inlet to a primary chamber and an outlet from a pumping chamber. Between the primary and pumping chambers are interposed concentric inner and outer pistons. Each piston is independently spring biased toward the pumping chamber. The inner piston is mechanically driven by an engine associated reciprocating drive and pumping action occurs as a result of the spring operating on the inner piston. The position of the outer piston relative to the inner piston is determined by the pressure in the pumping chamber as regulated by the force of the spring operating against the outer piston. When pressure in the pumping chamber exceeds predefined limits, the outer piston opens regulator ports disposed on the inner piston to recirculate fuel back into the low pressure primary chamber. Additionally, the outer piston acts as an accumulator to dampen pressure spikes.
    Type: Grant
    Filed: June 20, 1995
    Date of Patent: November 12, 1996
    Assignee: Navistar International Transportation Corp.
    Inventors: Michael F. Pane, James J. Grinsteiner, Martin R. Zielke
  • Patent number: 4461613
    Abstract: The present invention relates to a double-acting hydraulic pump comprising a piston moving with a reciprocal rectilinear movement inside a cylinder of which each chamber is provided with a suction valve and a delivery valve, the rod of said piston being adapted to be driven by a variable-displacement driving member. The said piston rod extends beyond the piston and moves, outside the cylinder within a space of variable volume, provided in the body of the pump, which communicates, with a member controlling the by-pass device through which the two chambers of the cylinder communicate.
    Type: Grant
    Filed: March 19, 1982
    Date of Patent: July 24, 1984
    Assignees: Airmachines, Poclain Hydraulics
    Inventors: August Moiroux, Maurice Bouvier