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Five-bar compressor

Five-bar compressor description/claims

The present invention is based in part on U.S. Pat. No. 4,319,498 Mar. 16, 1982 and U.S. Pat. No. 4,467,756 Aug. 28, 1984. Presenting new and useful improvements in continuing development of electrical motor driven compressors.

1. Field of the Invention

The invention relates to electrical motor driven reciprocating piston compressors. The system is also applicable to engine driven systems.

2. Description of Prior Art

The primary object of the novel mechanism presented in the Cross References was directed toward the design of reciprocating piston internal combustion engines as indicated and described in their respective Summaries. In the present invention the characteristic 5-bar linkage is employed for use in small efficient electrical motor driven domestic air conditioning and refrigeration systems. The linkage presented is also adaptable to larger commercial systems requiring additional speed control using centrifugal switches on heavier starter windings and motor shaft mechanical governors.

The primary objective of the present application is directed toward lowering urban electrical grid load during peak summer temperatures which result from the necessary area wide use of additional air conditioning and extended use of refrigeration equipment. In the present invention this is accomplished by limiting surge electrical current during high torque start-up loads by decreasing the compressor initial piston loads and cylinder swept-volume. This is accomplished by limiting the distance of the piston stroke in its upward travel in the compressor cylinder to top-dead-center (TDC) during the initial crank acceleration at start-up when the inertia of reciprocating components is low.

The invention also lowers steady-state current flow in the compressor motor during periods of full-load torque and full speed at rated frequency and voltage by decoupling piston maximum pressure loads from the motor shaft by allowing the compressor piston and connecting rod to float free from the crankpin at its upward stroke position of 270° when its acceleration is highest allowing it to proceed under its own inertia to complete the full stroke at TDC. The ability to decouple the maximum compressor piston loads from the electric motor shaft prevents breakdown-to-torque overload exceeding rated voltage resulting in loss of motor speed and over heating during periods of urban heavy electrical grid load preventing motor damage.

Previous disclosures described in Cross-References 1 and 2 reduced first harmonic induced vibration by the use of crankpin cheek counterbalances. Cheek counterbalances are not used in the present invention which employs an opposed cylinder arrangement using a two-throw crankshaft with 180° between cranks of opposing cylinders. This arrangement provides full static balance and lightens crankshaft weight lessening starting torque and current surge and these become novel features of the new and useful improvements enhancing the design.

The primary object of the invention is the design of a small efficient electric motor driven compressor for domestic use in air conditioning and refrigeration equipment.

It is another object of the invention to increase the scope of the design to enable its usage in larger scale commercial future applications by heavier centrifugal switches on starter windings and the use of mechanical governors.

Another important object of the invention is to lessen the vibration of the reciprocating piston system of the general character described in the Cross References by simultaneously sequencing and distributing the said reciprocating loads upon each side of the crankshaft within a 180° opposed cylinder arrangement.

It is yet another object of the invention to eliminate the incidence of electrical motor damage during periods of high urban grid power usage and loss of power when the motor overheats at rated voltage at lower speed.

A further object of the invention is to construct a piston compressor having a plurality of 180° opposed crank throws.

FIG. 1 is a top view of a 180° opposed two-throw crankshaft.

• Provisional Patent
• Utility Patent

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