Reciprocating compressor

Patent metadata

Field	Value
Publication number	US-10724512-B2
Application number	US-201615766978-A
Country	US
Kind code	B2
Filing date	Oct 4, 2016
Priority date	Oct 9, 2015
Publication date	Jul 28, 2020
Grant date	Jul 28, 2020

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

The invention claimed is:

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; and
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 at least (i) an intersection, between a first plane containing the cylinder axis and the recessed surface, is a first curve having at least a convex part facing the valve opening, (ii) an intersection, between a second plane perpendicular to the cylinder axis and the recessed surface, is a second curve having a concavity facing the valve opening, and (iii) an intersection, between a third plane perpendicular to the cylinder axis, is a third curve having a concavity facing the valve opening.

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

3. The reciprocating compressor of claim 1 , 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.

4. The reciprocating compressor of claim 2 , 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, and is further defined by the interpolation of the third curve and/or of the fourth curve.

5. The reciprocating compressor of claim 3 , wherein the base curve is defined by an opening formed in the cylinder lateral wall.

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

7. The reciprocating compressor of claim 2 , wherein the vertexes of the second curve, the third curve, and the fourth curve belong to the first curve.

8. 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.

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

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

11. The reciprocating compressor of claim 9 , wherein the cylinder lateral wall is defined by a cylinder liner coupled to the cylinder body.

12. The reciprocating compressor of claim 11 , 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.

13. The reciprocating compressor of claim 1 , wherein the second curve is 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.

14. The reciprocating compressor of claim 1 , wherein the third curve is 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.

15. The reciprocating compressor of claim 2 , wherein the fourth curve is at 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.

16. The reciprocating compressor of claim 15 , wherein the second curve is 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; and the third curve is 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.

17. 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; and
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 at least (i) an intersection, between the recessed surface and a plane containing the cylinder axis, is a first curve having at least a convex part facing the valve opening, and (ii) an intersection, between the recessed surface and a plane perpendicular to the cylinder axis and proximate to a free end of the cylinder head, is a 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.

18. 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; and
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 at least (i) an intersection, between the recessed surface and a plane containing the cylinder axis, is a curve having at least a convex part facing the valve opening, and (ii) an intersection, between the recessed surface and a plane perpendicular to the cylinder axis and containing a valve axis, is a 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.

19. 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; and
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 at least (i) an intersection, between the recessed surface and a plane containing the cylinder axis, is a curve having at least a convex part facing the valve opening, and (ii) an intersection, between the recessed surface and a plane perpendicular to the cylinder axis between a valve axis and a free end of the cylinder head, is a curve at 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.

Assignees

• Nuovo Pignone Tecnologie Srl

Inventors

• Sorgona Federico
• Orsi Gianni
• 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