Proportional solenoid control valve

• US 20050173664A1
• Filed: 02/06/2004
• Published: 08/11/2005
• Est. Priority Date: 02/06/2004
• Status: Active Grant

• Current Assignee: Kojima Instruments Incorporated
• Original Assignee: Kojima Instruments Incorporated
• Inventors: Ogawa, Osamu
• Granted Patent: US 7,055,798 B2
• Time in Patent Office: Days
• US Class Current: 251/129.80
• CPC Class Codes: F16K 31/0655 Lift valves
• CPC Class Codes: G05D 16/2022 actuated by a proportional solenoid throttling means G05D16/2024

Abstract

A proportional solenoid control valve comprises a flat square spring which is wide in maintaining width with respect to displacement of a spring having a greater spring constant, so that accurate control of fluid is realized. The flat square spring has four tubs and is supported with respect to a step face with outer peripheral section thereof. The valve further comprises a sealing mechanism loaded with rubber resilience compensates instability of armature construction and resilient sealing section. The spring constant of the flat square spring is improved by strengthening the magnetic force, thus hysteresis can be made to be smaller.

Claims

1. A proportional solenoid control valve comprising:

a solenoid;

a magnetic movable member which is applied a magnetic attraction force by the solenoid; and

a flat spring for engaging its outer periphery section with non-magnetic cylindrical member for guiding the magnetic movable member, and for engaging its inner periphery section with the magnetic movable member so as to balance in power with the magnetic movable member due to the magnetic attraction force.

2. A proportional solenoid valve as set forth in claim 1, wherein the flat spring is a flat square spring which has cutouts at inner side of four corners thereof so as to obtain uniform deformation displacement, and which is strong and is wide in spring constant maintaining width with respect to the spring displacement, wherein the flat square spring is applied low friction Teflon coating on one supporting point side face.

3. A proportional solenoid control valve as set forth in claim 1, wherein the flat spring is a circular flat spring has cutouts at four points of inner section so that the distance between the supporting points does not change even when the load has changed.

4. A proportional solenoid control valve as set forth in claim 1, further comprising a sealing mechanism which compensates dimensional instability by combining a rubber having smaller displacement and smaller hardness and a rubber having greater hardness at a section corresponding to an orifice.