Fluid pumping device

Patent metadata

Field	Value
Publication number	US-10895252-B2
Application number	US-201816223530-A
Country	US
Kind code	B2
Filing date	Dec 18, 2018
Priority date	Dec 18, 2018
Publication date	Jan 19, 2021
Grant date	Jan 19, 2021

Abstract

A fluid pumping device includes a barrel body and a piston mechanism. The barrel body has a cavity. The piston mechanism includes a piston member, a first annular plug, and a second annular plug. The piston member movably extends into the cavity. The piston member has two annular grooves where the first and the second annular plugs are disposed respectively. Each of the first the second annular plugs has an annular base section and an annular protrusion section. The annular protrusion section has a first outer annular abutting face. The annular base section has an outer annular base face. The first outer annular abutting face abuts against the inner wall of the cavity.

First claim

What is claimed is:

1. A fluid pumping device, including:
a barrel body, including a first end portion and a second end portion located at an opposite side thereof from the first end portion, the first end portion and the second end portion being aligned along an axial direction, the first end portion being formed with a flow hole, the second end portion having an opening, the barrel body further including a cavity communicating the flow hole and the opening respectively;
a piston mechanism, including a piston member, a first annular plug, and a second annular plug, the piston member being arranged through the opening and movably extending into the cavity, the piston member having two annular grooves, the first annular plug and the second annular plug being disposed in the two annular grooves respectively, the first annular plug being structurally same with the second annular plug, each of the first annular plug and the second annular plug having an annular base section and an annular protrusion section, the annular protrusion section having a first outer annular abutting face, the annular base section having an outer annular base face, the first outer annular abutting face traversing the outer annular base face, the first outer annular abutting face abutting against an inner wall of the cavity to block the cavity, the annular base section of the first annular plug being closer to the second end portion than the annular protrusion section of the first annular plug is, the annular protrusion section of the second annular plug being closer to the second end portion than the annular base section of the second annular plug is;
wherein the annular protrusion section further includes a compression portion and an outer annular arm corresponding to the compression portion, the outer annular arm is radially swingable toward the compression portion, the outer annular arm has the first outer annular abutting face;
wherein the annular protrusion section further includes an inner annular arm, the inner annular arm includes an inner annular surface which abuts, in parallel, against a bottom of one of the annular grooves, the compression portion is arranged between the inner annular arm and the outer annular arm, the outer annular arm is thicker than the inner annular arm; wherein each of the annular grooves has two lateral walk opposite to each other, the two lateral walls face the axial direction, one of two lateral walls in each groove has a guiding face which is non-perpendicular to the axial direction and non-perpendicular to the two lateral walls.

2. The fluid pumping device of claim 1 , wherein each of the first outer annular abutting face of the first annular plug and the first outer annular abutting face of the second annular plug obliquely extends inward along a radial direction relative to the axial direction, the first outer annular abutting face of the first annular plug faces the second end portion, the first outer annular abutting face of the second annular plug faces the first end portion.

3. The fluid pumping device of claim 1 , wherein an extension size of the annular base section along the axial direction is larger than or equal to an extension size of the annular protrusion section along the axial direction.

4. The fluid pumping device of claim 1 , wherein the compression portion is a recess.

5. The fluid pumping device of claim 1 , wherein an angle between the first outer annular abutting against face and the outer annular base face is larger than 90 degrees.

6. The fluid pumping device of claim 1 , wherein a reference line extending radially passes through a top portion of the annular protrusion section, the annular protrusion section is formed with the first outer annular abutting face and a second outer annular abutting face at an opposite side thereof at two sides of the reference line respectively, an extension size of the first outer annular abutting face along the axial direction is larger than an extension size of the second outer annular abutting face along the axial direction.

7. The fluid pumping device of claim 6 , wherein corresponding to the axial direction, the second outer annular abutting face has a greater slope than a slope of the first outer annular abutting face, the second outer annular abutting face of the first annular plug faces the first end portion, the second outer annular abutting face of the second annular plug faces the second end portion.

8. The fluid pumping device of claim 7 , wherein each of the first outer annular abutting face of the first annular plug and the first outer annular abutting face of the second annular plug obliquely extends inward along a radial direction relative to the axial direction, the first outer annular abutting face of the first annular plug faces the second end portion, the first outer annular abutting face of the second annular plug faces the first end portion; an extension size of the annular base section along the axial direction is larger than an extension size of the annular protrusion section along the axial direction; the compression portion is a recess; an angle between the first outer annular abutting face and the outer annular base face is larger than 90 degrees; the annular base section has a radial cross-section which is substantially rectangle; the top portion is radially tapered outward; the first annular plug is closer to the first end portion than the second annular plug is; each of the annular grooves has a bevel, the annular base section extends not over the entire extension of the bevel; the guiding face is an inclined guiding face which is inclined relative to the axial direction and inclined relative to the two lateral walls.

Assignees

• Lih Yann Ind Co Ltd

Inventors

• Liao Po-Lin

Classifications

• F02M37/14 Primary

  the pumps being combined with other apparatus · CPC title

• F04B13/00

  Pumps specially modified to deliver fixed or variable measured quantities · CPC title

• F04B53/14

  Pistons, piston-rods or piston-rod connections · CPC title

• F04B9/103

  having only one pumping chamber · CPC title

• F04B43/067 Primary

  the fluid being actuated directly by a piston · CPC title