Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
  • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
  • F02M63/0012—Valves
  • F02M63/0014—Valves characterised by the valve actuating means
  • F02M63/0015—Valves characterised by the valve actuating means electrical, e.g. using solenoid
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
  • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
  • F02M59/20—Varying fuel delivery in quantity or timing
  • F02M59/36—Varying fuel delivery in quantity or timing by variably-timed valves controlling fuel passages to pumping elements or overflow passages
  • F02M59/366—Valves being actuated electrically
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
  • F16K31/00—Actuating devices; Operating means; Releasing devices
  • F16K31/12—Actuating devices; Operating means; Releasing devices actuated by fluid
  • F16K31/36—Actuating devices; Operating means; Releasing devices actuated by fluid in which fluid from the circuit is constantly supplied to the fluid motor
  • F16K31/40—Actuating devices; Operating means; Releasing devices actuated by fluid in which fluid from the circuit is constantly supplied to the fluid motor with electrically-actuated member in the discharge of the motor
  • F16K31/406—Actuating devices; Operating means; Releasing devices actuated by fluid in which fluid from the circuit is constantly supplied to the fluid motor with electrically-actuated member in the discharge of the motor acting on a piston
  • F16K31/408—Actuating devices; Operating means; Releasing devices actuated by fluid in which fluid from the circuit is constantly supplied to the fluid motor with electrically-actuated member in the discharge of the motor acting on a piston the discharge being effected through the piston and being blockable by an electrically-actuated member making contact with the piston

Definitions

• the primary application field of the invention relates to fuel systems for compressed natural gas (CNC) vehicles or the like. It may be use for other applications, such as high pressure gas filling station.
• CNC compressed natural gas
• a tubular sleeve assembly with a magnetic closure at one end and connects to the hollow cylindrical flange provides the room for the slide of the pilot piston, the seal piston and the primary piston.
• the primary piston is received in the seal piston, and both move axially in the empty space of the flange.
• a special outer surface is designed at the open side of the seal piston being in perfect contact with the inner surface of the housing, to restrain the gas flow from the inlet to create a pressure difference between the front side and the of the back side of the primary piston. The valve opens instantly.
• Fig. 1 is a cross-sectional view of a solenoid isolation valve of configuration 1 at closed state.
• Fig. 2 is a cross-sectional view of a solenoid isolation valve of configuration 1 at opened state.
• Fig. 3 is a cross-sectional view of a solenoid isolation valve of configuration 2 at closed state. DESCRIPTION OF PREFEERED EMBODIMENT
• FIG. 1 shows a solenoid isolation valve in section view.
• housing 1 it provides the primary piston chamber 2 and the outlet chamber 3; both chambers are in gas communication with each other through the primary channel 4.
• the primary piston chamber 2 connects to the gas inlet 9.
• the outlet chamber 3 connects the gas outlet 1 0.
• FIG. 1 7 An axial center column 1 1 with a circular disk 1 2 at one end, and a bleed hole seat 1 3 at another end. There are vent holes 1 4 through the circular disk 1 2, parallel to the axis of the axial center column 1 1 .
• the axial center column 1 1 mounts into the primary channel 4 with external threads on the circular disk 1 2.
• the column portion of the axial center column 1 1 sits in the primary piston chamber 2.
• the primary piston chamber 2 is in gas communication with the outlet chamber 3 through the vent holes 14 of the circular disk 1 2.
• a pilot piston 1 5 is received and axially movable within the tubular sleeve 5.
• the pilot piston 1 5 has a sufficiently loose fit within the tubular sleeve 5, to allow gas from one end of the pilot piston 1 5 to reach the other end.
• the pilot piston 1 5 is comprised of a magnetic pilot piston body 29 and a pilot seal 30 mounted at the end of piston body 29 to achieve a gas-tight seal against the bleed hole seat 1 3.
• the pilot seal 30 is made of soft rubber.
• a compression spring 1 6 urges the pilot piston 1 5 away from the magnetic closure 6 against the bleed hole seat 1 3 of the axial center column 1 1 towards the pilot piston closed position.
• An axial passage 1 7 within the axial center column 1 1 connects to a bleed orifice 1 8, close to the bleed hole seat 13.
• the axial passage 1 7 communicates remote from chambers proximate the pilot piston 1 5 with the outlet chamber 3.
• a bowl-like seal piston 1 9 has a front side and a back side.
• the seal piston 19 is open at the front side, and a primary piston 20 is received within the seal piston 19.
• Both the primary piston 20 and the seal piston 19 are axially movable within the hollow cylindrical flange 7, and also slide able along the axial center column 1 1. Since the bowl- like seal piston 19 is made of soft plastic, having a close fit within the hollow cylindrical flange 7, it restrains the passage of gas axially between the seal piston 19 and the hollow cylindrical flange 7, when the seal piston 1 9 moves axially within the flange 7.
• a conical compression spring 28 urges the bowl-like seal piston 19 and the primary piston 20 towards the closed position.
• a primary seal seat 21 and a primary orifice 31 locate at the boundary between the primary piston chamber 2 and the primary channel 4.
• a curved spring washer 22 locates in a chamber between the bowl-like seal piston 19 and the primary piston 20, urging the primary piston 20 towards the closed position.
• the primary piston 20 is comprised of the primary piston body 32 and a primary seal 33 mounted at the end of the front side of the primary piston 20.
• the primary seal 33 is made of plastic.
• the primary piston 20 operates an opened and a closed position within the bowl-like seal piston 1 9.
• the primary piston 20 has a front side and a back side. The back side is near the chamber between the seal piston 19 and the primary piston 20. When the primary piston 20 is at the closed position, it stops gas flow from the primary piston chamber 2 to the vent holes 14 of the circular disk 12 through the primary orifice 31 .
• the seal piston 19 and the primary piston 20 are collectively known as primary piston assembly.
• a bowl channel hole 23 is at the bottom side of the bowl-like seal piston 19, communicating the gas between the empty space of the hollow cylindrical flange 7 and the chamber in between the seal piston 19 and the primary piston 20.
• a primary peripheral seal 24 locates between the primary piston 20 and the axial center column 1 1 , acting to restrain the passage of gas axially between the primary piston 20 and the axial center column 1 1 .
• the primary peripheral seal 24 is achieved by an o-ring element located in a circumferential recess in an inner cylindrical portion of the primary piston body 32.
• the secondary peripheral seal 25 locates between the primary piston 20 and the bowl-like seal piston 19, acting to restrain the passage of gas axially between the seal piston 19 and the primary piston 20.
• the secondary peripheral seal 25 is achieved by an o-ring element located in a circumferential recess in an outer cylindrical portion of the primary piston body 32.
• the outer surface 27 of the bowl-like seal piston 1 9, located at the front end, and the inner surface of the primary piston chamber 2 are in perfect contact with each other so that initially the gap between two surfaces restrains gas from the gas inlet 9 to the primary piston chamber 2 when the electrical coil 8 is not activated.
• the inlet gas pressurizes the valve.
• the pressured gas pushes up the bowl-like seal piston 19 to fill all empty chambers in the valve.
• the gas pressure in the valve is then in equilibrium.
• the two compression springs 16, 28 and the spring washer 22 push the pilot piston 1 5, the seal piston 19 and the primary piston 20 toward the closed position.
• figure 3 shows another kind of configuration of a solenoid isolation valve in section view.
• the seal piston 19 is a hollow cylinder, and a primary piston 20 is received in the seal piston.
• the compression springs 22 pushes the seal piston 19 and the compression 22 pushes the primary piston 20 towards the closed position respectively.
• the method of operation procedure is similar to the above-mentioned for figure 1 and 2.

Landscapes

• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Magnetically Actuated Valves (AREA)
• Fluid-Driven Valves (AREA)

Priority Applications (3)

Applications Claiming Priority (2)

Publications (1)

Family

ID=37766344

Family Applications (1)

Country Status (6)

Families Citing this family (12)

Citations (6)

Family Cites Families (7)

• 2005
  • 2005-08-22 US US11/161,914 patent/US7334770B2/en not_active Expired - Fee Related
• 2006
  • 2006-07-07 CA CA2619394A patent/CA2619394C/en not_active Expired - Fee Related
  • 2006-07-07 EP EP06752875.2A patent/EP1920153A4/en not_active Withdrawn
  • 2006-07-07 WO PCT/CA2006/001105 patent/WO2007022614A1/en not_active Ceased
  • 2006-07-07 CN CN2006800304053A patent/CN101273193B/zh not_active Expired - Fee Related
  • 2006-07-11 TW TW095125234A patent/TW200708678A/zh not_active IP Right Cessation

Patent Citations (6)

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