US Pat. No. 9,133,933

PISTON RING

BURCKHARDT COMPRESSION AG...

1. A piston ring for a reciprocating compressor, comprising a one-piece sealing ring, extending in a circumferential direction
around a middle point with an axial direction, with an outer face extending in an arcuate manner, wherein the sealing ring
has a straight cut joint with joint ends and also a gap extending in the circumferential direction between the joint ends,
and also comprising a joint lock for sealing the gap, wherein the joint lock is designed symmetrically with regard to a symmetry
plane, wherein the joint lock, starting from the symmetry plane, has two leg sections extending on both sides in the circumferential
direction, wherein the two joint-lock leg sections altogether extend over an angular range of between 20° and a maximum of
180°, and wherein the joint-lock leg sections have a radially outwardly oriented outer side extending in an arcuate manner,
and wherein the joint lock, starting from the symmetry plane, has a contact section extending on both sides in the circumferential
direction and projecting in the axial direction over the joint-lock leg sections, wherein the contact section extends in the
circumferential direction only over a partial angle of the two joint-lock leg sections, and wherein the contact section has
a radially outwardly oriented contact face, and wherein the contact face extends in a set back manner in the radial direction
with regard to the leg-section outer side so that the joint-lock leg sections along the contact face form a stop which is
oriented in the axial direction, wherein the sealing ring and the joint lock are of a mutually matched design in such a way
that in the assembled state the joint lock butts laterally against the sealing ring via the stop, and in such a way that the
contact face of the contact section extends along the gap and covers this in the circumferential direction.

US Pat. No. 9,810,175

OIL SCRAPER RING

BURCKHARDT COMPRESSION AG...

1. An oil scraper ring assembly comprising:
a holding ring which extends in a circumferential direction about a center and which has a longitudinal axis extending through
the center, wherein the holding ring comprises:

a first end face and a second end face oriented towards the center, wherein the first and second end faces are mutually separated
by a groove running in the circumferential direction, and wherein the first end face is adapted to contact a surface of a
piston rod and projects in a step-like manner further towards the center than the second end face,

a first side surface, a second side surface, as well as an outer surface facing away with respect to the center,
wherein the first side surface has a plurality of recesses forming a plurality of conduits extending towards the center, which
conduits are mutually spaced apart in the circumferential direction and which extend in the radial direction over the complete
width of the first side surface and thereby form a fluid conducting connection between the end face and the outer surface,

a plurality of crown parts, each respective crown part extending in the circumferential direction and arranged between two
of the plurality of conduits, wherein each crown part respectively projects over the two conduits in the direction of extent
of the longitudinal axis and in this connection forms a side surface for the two conduits,

wherein at least one of the crown parts is a long crown part which extends over an angular range between 60 degrees and 350
degrees in the circumferential direction, and

wherein at least said long crown part forms an intermediate space between the second end face and the surface of the piston
rod that is circumferentially flow connected to the two respective conduits, wherein at least said long crown part projects
over the respective intermediate space in the direction of extent of the longitudinal axis such that the second end face forms
a boundary wall for the intermediate space, and

a scraper having a scraper lip, wherein the scraper is arranged:
in the groove of the holding ring, such that the scraper lip is oriented towards the center of the holding ring in order to
scrape oil at the piston rod, and

at an end of the intermediate space, in the longitudinal direction, such that the intermediate space starts at the scraper
lip so that oil removed from the piston rod by the scraper lip is moved into the intermediate space;

wherein that oil scraped by the scraper lip at the end face flows through the intermediate space and escapes to the outer
surface from the intermediate space via the two respective conduits.

US Pat. No. 9,273,675

DEVICE AND METHOD FOR PREPARING LIQUIFIED NATURAL GAS (LNG) FUEL

BURCKHARDT COMPRESSION AG...

1. A method for creating a supply of natural gas fuel for a combustion engine, comprising:
obtaining boil-off gas from a liquid natural gas storage tank containing liquefied natural gas,
compressing the boil-off gas in a compression stage consisting of a labyrinth-sealed piston-compressor to obtain a natural
gas fuel, and

compressing the natural gas fuel in a compression stage consisting of a piston-ring-sealed piston-compressor,
compressing the natural gas fuel to a pressure of between 100 Bar and 500 Bar, and
making the natural gas fuel available at an outlet,
wherein the piston-ring-sealed piston-compressor has a bypass extending from a position downstream of the piston-ring-sealed
piston-compressor to a position between the labyrinth-sealed piston-compressor and the piston-ring-sealed piston-compressor,
and wherein the natural gas fuel is returned via the at least one bypass such that the natural gas fuel at the outlet is at
a required target pressure.

US Pat. No. 9,234,479

OIL SCRAPER RING

BURCKHARDT COMPRESSION AG...

1. An oil scraper ring comprising
a holding ring,
a clamping element, and
a scraper having a scraper lip, wherein the scraper is arranged in the holding ring such that the scraper lip is oriented
towards a center of the oil scraper ring in order to scrape oil at a piston rod,

wherein the scraper is composed of a plurality of scraper segments which abut one another in a circumferential direction of
the oil scraper ring, thereby forming a scraper segment butt-joint between consecutive scraper segments;

wherein the holding ring has two end faces, a first end face and a second end face oriented towards the center of the oil
scraper ring, the first end face and the second end face being mutually separated by a groove running in the circumferential
direction;

wherein the groove is for form-fitted reception of the scraper segments;
wherein the holding ring and the scraper extend in an axial direction;
wherein the holding ring in the axial direction ends on each side at a side face extending radial to the axial direction,
so that the side faces extend in parallel to each other, wherein the scraper segments are arranged in the holding ring such
that the scraper segments do not protrude from the side faces in the axial direction;

wherein the holding ring is composed of a plurality of holding ring segments which abut one another in the circumferential
direction, thereby forming a holding ring segment butt-joint between consecutive holding ring segments;

wherein the holding ring is made of plastic,
wherein at least the first end face of the holding ring is adapted to contact the piston rod, wherein the first end face extends
in axial direction forming one continuous surface that contacts the piston rod;

wherein the holding ring has an outer surface, oriented opposite to the center of the oil scraper ring;
wherein the clamping element encloses the holding ring from the outer surface to bring a bias acting against the center onto
the holding ring and the first end face, to hold the holding ring in an defined position;

wherein the scraper is composed of a material having a larger hardness than the plastic forming the first end face;
wherein the scraper lip of the scraper has a contact position oriented towards the center;
wherein the scraper and the holding ring are configured mutually adapted such that both of the at least one end face and the
contact position are configured to simultaneously contact the piston rod;

wherein the holding ring segment butt-joints at the at least one end face and the scraper segment butt-joints at the contact
position are arranged spaced apart in axial direction and are arranged spaced apart from each other in circumferential direction
so that the at least one end face and the contact position seal the piston rod against leakage in axial direction; and

wherein the holding ring has at least one passage running radially with respect to the center, forming a passage between the
second end face and the outer surface.

US Pat. No. 9,309,878

POPPET VALVE FOR A COMPRESSOR

BURCKHARDT COMPRESSION AG...

1. A poppet valve for a compressor, comprising a cage, a valve seat and a plurality of closing elements, wherein the cage
has a plurality of bores running in an axial direction, wherein the bores are open towards the valve seat and have a bottom
element at an end opposite the valve seat, wherein a closing element which is moveable in the axial direction is arranged
in each bore, wherein the valve seat has a plurality of passage openings which are arranged opposite the bores in the axial
direction such that each of the passage openings can be closed by one of the closing elements, wherein a support element is
arranged in each of the bores and wherein a spring is arranged between each support element and the respective closing element
in order to apply a preload force directed towards the valve seat to the closing element, wherein the support element has
at least one support element opening arranged eccentrically in relation to the bore, and that the bottom element has at least
one bottom element opening arranged eccentrically in relation to the bore, in order to form a passage arranged eccentrically
in relation to the bore in the axial direction through the support element and the bottom element.

US Pat. No. 9,183,975

LINEAR BEARING, AND SOLENOID COMPRISING SUCH A LINEAR BEARING

BURCKHARDT COMPRESSION AG...

1. A linear bearing (3) comprising:
a plurality of concentrically arranged springs (2), wherein each spring (2) is configured as a disk spring having a fastening part (2a) and a bore (2c) arranged in a center (Z), wherein the fastening part (2a) is configured at least partly ring-shaped;

wherein each spring (2) further comprises a spring arm (2b) which, starting from the fastening part (2a), ends in an end section (2g), wherein the end section (2g) has the bore (2c) and wherein the bore (2c) is concentrically arranged with respect to the fastening part (2a);

wherein each spring (2) has a movement direction (B) running perpendicular to the fastening part (2a), and wherein the springs (2) are arranged following one another in the movement direction (B);

wherein the spring arm (2b) has a spring arm section (2ba) with a central line (2bd) running concentrically with respect to the center (Z), the spring arm section (2ba) with central line (2bd) extending over an angular range (?) of between 100° and 300°;

wherein the central line (2bd) runs concentrically, and with a constant, radial distance with respect to the center (Z), and wherein the spring arm section
(2ba) has a width (2k) in a radial direction with respect to the center (Z), said width being at least five times larger than the thickness (2i) of the spring arm (2b); and

wherein the width (2k) of the spring arm section (2ba) is configured such that it extends with respect to the ring-shaped fastening part (2a) and the end section (2g) on the formation of a lateral gap (2d).

US Pat. No. 10,364,894

SEALING ASSEMBLY AND METHOD FOR THE OPERATION THEREOF

BURCKHARDT COMPRESSION AG...

1. A sealing assembly (1) for sealing a piston rod (2) of a piston compressor, which piston rod extends in an axial direction (A) and can be moved back and forth in the axial direction (A), said sealing assembly comprising at least one packing chamber (4) wherein the packing chamber (4) is bounded in the axial direction (A) by a first and a second side wall (5, 6) and radially by a cylindrically shaped housing (3) with a given inner radius, wherein at least one packing ring (78), configured as a sealing ring (7) or as a scraping ring (8), as well as a spring device (9) are arranged in the packing chamber (4), and wherein a spring device (9) and at least one packing ring (78) are arranged one after the other in the axial direction (A) proceeding from the first side wall (5), wherein the packing ring (78) lies against the second side wall (6), characterized in that the spring device (9) is configured as a magnetic spring and consists of two assemblies (9a, 9b) spaced apart in the axial direction (A), a first assembly (9a) and a second assembly (b), wherein each assembly (9a, 9b) comprises at least one magnet (10a, 10b), and wherein the magnets (10a, 10b) are arranged in the two assemblies (9a, 9b) in a mutually matched manner in such a way that the two assemblies (9a, 9b) repel each other, and wherein at least one of the two assemblies (9a, 9b)) is comprised of slideably interlaced ring segments inwardly biased by a spring element, and said at least one assembly has an outer radius smaller than the given inner radius of said cylindrically shaped housing such that it is elastically expandable radially outwards when said piston rod applies a radial force onto said at least one assembly.