PUMP PISTON ASSEMBLY WITH ACOUSTIC DAMPENING DEVICE
First Claim
Patent Images
1. A piston assembly, comprising:
- a cylinder of a first material;
at least one piston of a second material different from the first material slidably mounted for reciprocating motion in the cylinder, the piston being hollow and having an inner surface of a first diameter and an outer cylindrical surface of a second diameter;
at least one liner sleeve mounted on one of said inner and outer surfaces of the piston and having a close tolerance fit to the diameter of the piston surface on which it is mounted, whereby the opposing surfaces of the liner sleeve and piston are in face to face engagement; and
the liner sleeve being of an acoustic dampening material which has a lower acoustic frequency than the piston material.
2 Assignments
0 Petitions
Accused Products
Abstract
A pump piston assembly has a pump cylinder, at least one hollow piston slidably mounted for reciprocating motion in the pump cylinder, the piston having an inner surface of a first diameter and an outer surface of a second diameter, and a liner sleeve of a different material from the piston mounted on the inner or outer surface of the piston with a close or friction fit to the diameter of the piston surface on which it is mounted. The liner sleeve is of an acoustic dampening material which has a lower acoustic frequency than the piston material and is configured to absorb harmonic acoustic vibrations resulting from reciprocation of the piston in the cylinder.
-
Citations
14 Claims
-
1. A piston assembly, comprising:
-
a cylinder of a first material; at least one piston of a second material different from the first material slidably mounted for reciprocating motion in the cylinder, the piston being hollow and having an inner surface of a first diameter and an outer cylindrical surface of a second diameter; at least one liner sleeve mounted on one of said inner and outer surfaces of the piston and having a close tolerance fit to the diameter of the piston surface on which it is mounted, whereby the opposing surfaces of the liner sleeve and piston are in face to face engagement; and the liner sleeve being of an acoustic dampening material which has a lower acoustic frequency than the piston material. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
-
-
12. A gas pump assembly for a medical ventilator, comprising:
-
at least a first gas piston assembly comprising a cylinder having a longitudinal axis and a first hollow piston slidably mounted for reciprocating movement in the cylinder and having a piston rod extending out of one end of the cylinder; a drive unit drivably linked to the piston rod and configured for driving the piston back and forth in the cylinder; the piston being hollow and having an inner surface of a first diameter and an outer cylindrical surface of a second diameter; and at least one liner sleeve mounted on one of said inner and outer surfaces of the piston and having a close tolerance fit to the diameter of the piston surface on which it is mounted, the liner sleeve being of an acoustic dampening material which has a lower acoustic frequency than the piston material. - View Dependent Claims (13, 14)
-
Specification