A reciprocating compressor

Patent metadata

Field	Value
Publication number	US-2018291884-A1
Application number	US-201615766978-A
Country	US
Kind code	A1
Filing date	Oct 4, 2016
Priority date	Oct 9, 2015
Publication date	Oct 11, 2018
Grant date	—

Abstract

It is disclosed a reciprocating compressor having a cylinder body that defines a cylinder; the cylinder may have a cylinder lateral wall and a cylinder axis A and inside it a piston is movable; at least one valve is provided to selectively open and close a valve opening formed in the cylinder lateral wall; cylinder heads at least partially protruding towards the piston inside the cylinder have a recessed surface at least partially facing the valve openings; an intersection between at least a plane containing the cylinder axis A and the recessed surface is a first curve having at least a convex part facing the valve opening.

First claim

1 . A reciprocating compressor, comprising:
a cylinder body defining a cylinder, the cylinder having a cylinder lateral wall and a cylinder axis, a piston movable inside the cylinder, at least one valve configured to selectively open and close a valve opening formed in the cylinder lateral wall, at least a cylinder head that at least partially protrudes towards the piston inside the cylinder, the cylinder head having a recessed surface at least partially facing the valve opening, wherein an intersection between at least a plane containing the cylinder axis and the recessed surface is a first curve having at least a convex part facing the valve opening.

2 . The reciprocating compressor of claim 1 , wherein the intersection between at least a plane perpendicular to the cylinder axis and the recessed surface is a further curve having a concavity facing the valve opening.

3 . The reciprocating compressor of claim 2 , wherein the intersection between the recessed surface and at least a first plane perpendicular to the cylinder axis and further containing a free end of the cylinder head is a second curve at least partially defined by the equation:
y=A 3 x 2 +B 3 x+C 3 ,
wherein A 3 , B 3 and C 3 are constants, and the value of A 3 is ≠0.

4 . The reciprocating compressor of claim 2 , wherein the intersection between the recessed surface and at least a second plane perpendicular to the cylinder axis and further containing a valve axis is a third curve at least partially defined by the equation:
y=A 1 x 2 +B 1 x+C 1
wherein A 1 , B 1 and C 1 are constants, and the value of A 1 is ≠0.

5 . The reciprocating compressor of claim 2 , wherein the intersection between the recessed surface and at least a third plane perpendicular to the cylinder axis and further lying between the valve axis and the free end of the cylinder head is a fourth curve least partially defined by the equation:
y=A 2 x 2 +B 2 x+C 2
wherein A 2 , B 2 and C 2 are constants, and the value of A 2 is ≠0.

6 . The reciprocating compressor of claim 3 , wherein the shape of the recessed surface is defined by the interpolation of at least a base curve of the valve opening and the second curve.

7 . The reciprocating compressor of claim 6 , wherein the shape of the recessed surface is further defined by the interpolation of the third curve and/or of the fourth curve.

8 . The reciprocating compressor of claim 6 , wherein the base curve is defined by an opening formed in the cylinder lateral wall.

9 . The reciprocating compressor of claim 1 , wherein a valve axis is perpendicular to the cylinder axis.

10 . The reciprocating compressor of claim 1 , wherein the vertexes of the second curve, of the third curve, and of the fourth curve belong to the first curve.

11 . The reciprocating compressor of claim 1 , wherein the valve opening houses a valve comprising a plurality of valve passages formed in a valve seat, the valve passages facing the valve opening.

12 . The reciprocating compressor of claim 1 , wherein a cylinder head is formed in one piece with a cylinder body.

13 . The reciprocating compressor of claim 1 , wherein a cylinder head is removably fixed to the cylinder body

14 . The reciprocating compressor of claim 12 , wherein the cylinder lateral wall is defined by a cylinder liner coupled to the cylinder body.

15 . The reciprocating compressor of claim 14 , wherein a liner spacer extents from the cylinder head to the cylinder liner, the valve opening being at least partially formed in the cylinder liner and/or in the liner spacer.

Assignees

• Nuovo Pignone Tecnologie Srl

Inventors

• Orsi Gianni
• Sorgona Federico
• Babbini Alberto
• Bargiacchi Massimo
• Maleci Ricardo

Classifications

• F04B39/1013 Primary

  the members being of the poppet valve type · CPC title

• F04B39/125 Primary

  Cylinder heads · CPC title

• F04B39/10

  Adaptations or arrangements of distribution members · CPC title

• F04B39/126

  Cylinder liners · CPC title

• F04B39/122

  Cylinder block · CPC title