Electromagnetic valve device and fuel injection apparatus with the valve device

a valve device and electric motor technology, applied in the direction of valve operating means/releasing devices, fuel injecting pumps, machines/engines, etc., can solve the problems of cavitation erosion on the rapid drop of pressure in the damper room, and rise of pressure in the small gap. , the effect of preventing the occurrence of cavitation erosion on the upper surface of the armatur

Active Publication Date: 2008-06-26
MITSUBISHI HEAVY IND ENGINE & TURBOCHARGER LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0010]The present invention was made in light of the problems mentioned above, and object of the invention is to provide a compact electromagnetic valve device with which occurrence of cavitation erosion due to rapid change in pressure in a small gap is prevented without increasing in size and a fuel injection apparatus equipped with the electromagnetic valve device.
[0014]Therefore, in the course of upward moving of the poppet valve until it is closed, bending of the thin plate valve increases due to increased pressure in the small gap and flowage of fluid from the small gap through the holes increases, so rising of pressure in the gap 33 becomes slower as the poppet valve moves up. When the armature moves down, pressure in the small gap decreases and the through holes are closed by the thin plate valve, so rapid downward movement of the armature is prevented, the armature moves down slowly, and occurrence of cavitation on the upper surface of the armature is prevented.
[0018]Therefore, in the course of upward moving of the poppet valve until it is closed, flowage of fluid from the small gap through the central hole and slanted holes into the plunger room increases and rising of pressure in the small gap becomes slower as the poppet valve moves upward, and rapid pressure drop when the poppet valve moves down to end fuel injection is evaded and occurrence of cavitation erosion on the upper surface of the armature can be prevented.

Problems solved by technology

However, when the needle valve moves up to open the fuel passage, pressure in the armature room rises and pressure in the damper room decreased rapidly, so fluid in the armature room flows into the damper room through the check valve at high velocity.
Therefore, cavitation erosion tends to occur on the surface of the armature facing the damper room.

Method used

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  • Electromagnetic valve device and fuel injection apparatus with the valve device
  • Electromagnetic valve device and fuel injection apparatus with the valve device
  • Electromagnetic valve device and fuel injection apparatus with the valve device

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Experimental program
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first embodiment

The First Embodiment

[0033]FIG. 1 is a longitudinal sectional view of a first embodiment of the invention of the electromagnetic valve device for an electromagnetic controlled unit injector for a diesel engine showing when the poppet valve has been moved up, and FIG. 2 is a drawing as in FIG. 1 of the first embodiment when the poppet valve has been moved down.

[0034]Referring to FIGS. 1 and 2, through holes 13 are drilled in the armature 12 penetrating the armature 12 from the upper surface 12a thereof facing the end surface 11b of the solenoid core 11a to the rear surface near the outer periphery of the armature 12 such that distance from the center of the armature to each of the holes is the same or near the same to each other.

[0035]A flexible thin plate valve 14 and made of stainless steel or plastic material to have spring function is attached to the rear surface of the armature 12. The thin plate valve 14 is fixed at its central part to the rear surface of the armature 12 by the ...

second embodiment

The Second Embodiment

[0042]FIG. 3 is a longitudinal sectional view of a second embodiment of the invention of the electromagnetic valve device for an electromagnetic controlled unit injector for a diesel engine showing when the poppet valve has moved up, and FIG. 4 is a drawing as in FIG. 1 of the first embodiment when the poppet valve has moved down.

[0043]In the second embodiment, a central through hole 44 and two outwardly downward slanting holes 41 communicating with the central hole 44 are provided to the armature 12. The upper end part of the poppet valve 4 is screwed into the rear side of the armature to be fixed thereto.

[0044]A check valve 40 is provided at the upper end of the poppet valve 4 having the central hollow 31.

[0045]The check valve 40 includes a spherical valve body 42 and a return spring 43 energizing the spherical valve body 42 upward. The check valve 40 opens and closes the central hole 44 and slanting holes 41 and also opens and closes the opening of the centra...

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Abstract

A compact electromagnetic valve device for fuel injection apparatus for engines is provided with which occurrence of cavitation erosion due to rapid change in pressure in a small gap is prevented without increasing in size. Through holes are drilled in a platy armature connected to a poppet valve for opening and closing a fuel passage connecting a fuel feed / spill passage to a plunger room of a fuel injection apparatus, and a thin plate valve or check valve is provided to the armature to allow the holes to be opened or closed in accordance with upward or down ward movement of the armature connected with the popped valve.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to an electromagnetic valve device having a platy armature connected to an end of a valve body for opening and closing a fluid passage, a solenoid device which attracts the armature by attraction force generated when a solenoid coil is energized to allow the valve body to close the fluid passage and releases the armature from the attraction force when the energization is shutoff, and a return spring which thrusts back the armature so that the valve body opens the fluid passage when the energization is shutoff, and a fuel injection apparatus equipped with the electromagnetic valve device.[0003]2. Description of the Related Art[0004]An electromagnetic valve device having a platy armature connected to an end of a poppet valve for opening and closing a fuel passage between a plunger room and fuel spill side, a solenoid device which attracts the armature by attraction force generated when a sole...

Claims

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Application Information

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Patent Type & AuthorityApplications(United States)
IPC IPC(8): F02D1/16F02M51/06H01F7/16
CPCF02M57/023F02M59/366F02M63/0015F16K31/0693F02M2200/04F16K25/04F02M63/004
InventorOGAWA, HISAOTODA, MASAKI
OwnerMITSUBISHI HEAVY IND ENGINE & TURBOCHARGER LTD