Electromagnetic pump device

Patent metadata

Field	Value
Publication number	US-9429154-B2
Application number	US-201214124467-A
Country	US
Kind code	B2
Filing date	Jul 25, 2012
Priority date	Aug 24, 2011
Publication date	Aug 30, 2016
Grant date	Aug 30, 2016

Abstract

An electromagnetic pump including a suction check valve including a tubular portion and a flange portion that extends in a radial direction from an end edge of the tubular portion, the suction check valve being formed with a through hole that penetrates the tubular portion and the flange portion to form a suction port in an end surface of the flange portion. A strainer attached to the suction port and having a pore forming region which is larger than an inside diameter of the through hole at the tubular portion and in which a large number of pores are formed. The suction check valve is formed with a diameter reducing portion formed such that the inside diameter of the through hole is reduced from the flange portion toward the tubular portion with a degree of diameter reduction varied from a large value to a small value.

First claim

The invention claimed is:

1. An electromagnetic pump device comprising:
a suction check valve including a tubular portion and a flange portion that extends in a radial direction from an end edge of the tubular portion, the suction check valve being formed with a through hole that penetrates the tubular portion and the flange portion to form a suction port in an end surface of the flange portion; and
a strainer attached so as to cover the end surface of the flange portion to form the suction port and having a pore forming region which is larger than an inside diameter of the through hole at the tubular portion and in which a large number of pores are formed, wherein
the suction check valve is formed with a diameter reducing portion formed such that the inside diameter of the through hole is reduced from the flange portion toward the tubular portion with a degree of diameter reduction varied from a large value to a small value, and
the diameter reducing portion is formed from at least two stages of adjacent tapered surfaces of which inclination angles with respect to an axial center of the through hole are larger than 0 degrees and smaller than 90 degrees, and which become smaller from the end surface of the flange portion toward the tubular portion.

2. The electromagnetic pump device according to claim 1 , wherein
in the diameter reducing portion, an inflection point at which the inclination angle of the two stages of tapered surfaces is varied is determined at a position at which a thickness at a boundary portion between the tubular portion and the flange portion is equal to or more than a predetermined thickness.

3. The electromagnetic pump device according to claim 1 , wherein
the suction check valve includes a straight portion provided between the end surface of the flange portion and the diameter reducing portion, the straight portion having a uniform diameter corresponding to an inside diameter of the suction port.

4. The electromagnetic pump device according to claim 1 , wherein
the suction check valve is formed such that the inside diameter of the suction port is larger than an outside diameter of the tubular portion.

5. The electromagnetic pump device according to claim 1 in which a piston moves back and forth within a cylinder to pump a working fluid, wherein
the suction check valve is built in the cylinder.

6. The electromagnetic pump device according to claim 1 , wherein the diameter reducing portion is formed from two stages of tapered surfaces.

7. The electromagnetic pump device according to claim 1 , wherein the at least two stages of tapered surfaces include a first and second tapered surfaces, the first tapered surface being closer to the end surface of the flange portion, and
the end edge and the first tapered surface overlap each other as seen in an axial direction of the electromagnetic pump device, and the end edge and the second tapered surface overlap each other as seen in a radial direction of the electromagnetic pump device.

Assignees

• Ishikawa Kazunori
• Nakai Masaya
• Aisin Aw Co

Inventors

• Ishikawa Kazunori
• Nakai Masaya

Classifications

• F04B53/126

  Ball valves · CPC title

• F04B53/1002 Primary

  Ball valves · CPC title

• F04B53/20

  Filtering · CPC title

• F04B17/04

  using solenoids · CPC title

• F04B17/044

  using solenoids directly actuating the piston · CPC title