The present application discloses a natural gas compressor, a natural gas compressor assembly, a system for compressing natural gas, and a method of compressing natural gas. In certain embodiments, the natural gas compressor comprises a housing, a plurality of cylinder piston assemblies disposed wit
The present application discloses a natural gas compressor, a natural gas compressor assembly, a system for compressing natural gas, and a method of compressing natural gas. In certain embodiments, the natural gas compressor comprises a housing, a plurality of cylinder piston assemblies disposed within the housing, and a drive system for moving the pistons of the cylinder piston assemblies to compress natural gas within the cylinders of the assemblies. Each cylinder piston assembly comprises a piston for compressing natural gas within a cylinder of the assembly. The plurality of cylinder piston assemblies are fluidly connected in sequence such that each assembly forms a compression stage of the compressor.
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1. A natural gas compressor, comprising: a housing;a plurality of cylinder piston assemblies disposed within the housing, each assembly comprising a non-lubricated piston for compressing natural gas within a cylinder of the assembly, wherein the plurality of cylinder piston assemblies are fluidly co
1. A natural gas compressor, comprising: a housing;a plurality of cylinder piston assemblies disposed within the housing, each assembly comprising a non-lubricated piston for compressing natural gas within a cylinder of the assembly, wherein the plurality of cylinder piston assemblies are fluidly connected in sequence such that each assembly forms a compression stage of the compressor; anda drive system for moving the pistons of the cylinder piston assemblies to compress natural gas within the cylinders of the assemblies, wherein the drive system comprises a drive shaft and, for each assembly: an eccentric connected to the drive shaft and a connecting rod, wherein the rotation of the drive shaft rotates the eccentric and oscillates the connecting rod; a driving member connected to the connecting rod, wherein oscillation of the connecting rod oscillates the driving member; a pivoting member connecting the driving member to the housing, wherein the driving member pivots about the pivoting member; and a piston push rod connected to the driving member and engaging the piston of the assembly, wherein oscillation of the driving member moves the piston to compress natural gas within the cylinder of the assembly; and wherein each driving member is connected to the corresponding piston push rod by a connection; and each piston push rod is supported by upper and lower bushings, the upper bushing located above the connection of the driving member and the lower bushing located below the connection of the driving member. 2. The compressor of claim 1, wherein the compressor is sized and configured for use in a vehicle. 3. The compressor of claim 1, wherein the pressure of compressed natural gas exiting the last cylinder piston assembly of the compressor is between 2000 and 5000 psi when the drive shaft of the drive system is rotating between 50 and 500 RPM. 4. The compressor of claim 1, wherein the pistons of the cylinder piston assemblies and the piston push rods of the drive system comprise organic seals. 5. The compressor of claim 1, wherein each driving member of the drive system is connected on opposite sides of the corresponding piston push rod. 6. The compressor of claim 1, wherein the upper and lower bushings are greater than 1½ inches apart. 7. The compressor of claim 1 further comprising at least one cylinder head secured to the housing and comprising a plurality of cylinder head conduits that fluidly connect the cylinder piston assemblies. 8. The compressor of claim 7 further comprising an intercooler that cools the natural gas between the compression stages of the compressor, wherein the intercooler comprises a tank and a plurality of intercooler conduits in fluid communication with the cylinder head conduits. 9. The compressor of claim 1 further comprising a water jacket having at least one conduit that cools the cylinder piston assemblies of the compressor. 10. The compressor of claim 1, wherein the compressor has five cylinder piston assemblies forming five compression stages of the compressor, and wherein: the pressure velocity (PV) values for the compression stages range between 1800 psi*ft/min and 150000 psi*ft/min; the outlet pressures for the compression stages range between 30 psig and 3600 psig; the diameters of the cylinder piston assemblies range between ¼ inch and 5 inches; and the volumes of the cylinder piston assemblies range between ¼ in2 and 12 in2. 11. The compressor of claim 1, wherein at least one of the cylinder piston assemblies comprises stacked seals between the piston and cylinder of the assembly. 12. The compressor of claim 11, wherein the stacked seals are U-cup shaped seals with alternating layers of sealing material. 13. The compressor of claim 1, wherein the compressor is configured to recirculate natural gas that has blown by the pistons of the cylinder piston assemblies. 14. The compressor of claim 1, wherein the pressure of compressed natural gas exiting the last cylinder piston assembly of the compressor is 3600 psi when the drive shaft is rotating at 200 RPM. 15. The compressor of claim 1 further comprising a motor anda torque multiplier connected to the motor, wherein thedrive shaft of the drive system is connected to the torque multiplier. 16. The compressor of claim 15, wherein the compressor is sized such that it occupies no more than 8000 in3. 17. The compressor of claim 15, wherein the compressor is sized such that its dimensions are not greater than 14 in×14 in×36 in. 18. The compressor of claim 15, wherein the pressure of compressed natural gas exiting the last cylinder piston assembly of the compressor is between 2000 and 5000 psi when the drive shaft of the drive system is rotating between 50 and 500 RPM. 19. The compressor of claim 18 further comprising at least one cylinder head secured to the housing and comprising a plurality of conduits that fluidly connect the cylinder piston assemblies. 20. The compressor of claim 15, wherein: the pistons of the cylinder piston assemblies and the piston push rods of the drive system comprise organic seals; each driving member of the drive system is connected on opposite sides of the corresponding piston push rod by a connection; and each piston push rod of the drive system is supported by upper and lower bushings, the upper bushing located above the connection of the driving member and the lower bushing located below the connection of the driving member. 21. The compressor of claim 1 further comprising a compressed natural gas storage tank fluidly connected to the natural gas compressor. 22. The compressor of claim 21, wherein the compressor is sized such that it occupies no more than 35,000 in3. 23. The compressor of claim 21, wherein the compressor is sized such that its dimensions are not greater than 48 in×35 in ×20.5 in. 24. The compressor of claim 21 further comprising a water recirculation system having a water pump and a radiator. 25. The compressor of claim 15 further comprising an intercooler that cools the natural gas between the compression stages of the compressor, wherein the intercooler comprises a plurality of conduits in fluid communication with the cylinder piston assemblies. 26. The compressor of claim 1, wherein the compressor has a capacity of between 2 and 3 Gasoline Gallon Equivalent of compressed natural gas per hour. 27. A natural gas compressor for a vehicle, comprising: a housing; a plurality of cylinder piston assemblies disposed within the housing, each assembly comprising a piston for compressing natural gas within a cylinder of the assembly, wherein the plurality of cylinder piston assemblies are fluidly connected in sequence such that each assembly forms a compression stage of the compressor; a water jacket having at least one conduit that cools the cylinder piston assemblies; at least one cylinder head secured to the housing and comprising a plurality of cylinder head conduits that fluidly connect the cylinder piston assemblies; and a drive system for moving the pistons of the cylinder piston assemblies to compress natural gas within the cylinders of the assemblies, wherein the drive system comprises a drive shaft and, for each assembly: an eccentric connected to the drive shaft and a connecting rod, wherein the rotation of the drive shaft rotates the eccentric and oscillates the connecting rod; a driving member connected to the connecting rod, wherein oscillation of the connecting rod oscillates the driving member; a pivoting member connecting the driving member to the housing, wherein the driving member pivots about the pivoting member; and a piston push rod connected to the driving member and engaging the piston of the assembly, wherein oscillation of the driving member moves the piston to compress natural gas within the cylinder of the assembly; and wherein: the pistons of the cylinder piston assemblies and the piston push rods of the drive system comprise organic seals; each driving member of the drive system is connected to the corresponding piston push rod by a connection; and each piston push rod of the drive system is supported by upper and lower bushings, the upper bushing located above the connection of the driving member and the lower bushing located below the connection of the driving member.
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