Rotary compressor and method of assembly

The method of assembling a rotary compressor of the type having an outer metal cylindrical casing, a metal cylinder with a vane slot and a vane which comprises:

• forming the cylinder as viewed in top plan view with a circular chamber the center of which is in alignment with the central axis of the cylinder and having a circular outer wall slightly smaller than the inside diameter of the casing,
• cutting a vane slot in the cylinder, said vane slot being open at one end into the chamber,
• placing a vane in the vane slot to divide the chamber into a high pressure side and a low pressure side,
• forming three curved elongated ports spaced from each other in the cylinder between the chamber and outer wall, the length of each port and thickness of the metal between the port and outer wall of the cylinder cooperating to provide adequate strength for welding and sufficiently flexible to absorb any distortion forces caused by welding without transmitting any significant distortion forces to the vane slot, and
• welding the cylinder outer wall to the casing adjacent the three ports.

The method of assembling a rotary compressor of the type having an outer metal cylindrical casing, a metal cylinder with a vane slot and a vane which comprises:

• forming cylinder as viewed in top plan view with a circular chamber the center of which is in alignment with the central axis of the cylinder and having a circular outer wall slightly smaller than the inside diameter of the casing, said cylinder having a diameter of approximately 4.40 inches and a thickness of approximately 0.65 inches,
• cutting a vane slot in the cylinder, said vane slot being open at one end into the chamber,
• placing a vane in the vane slot to divide the chamber into a high pressure side and a low pressure side,
• forming three curved elongated ports spaced from each other in the cylinder between the chamber and outer wall, each port having a length of between 1.61 and 2.26 inches and the thickness of the metal between the port and outer wall of the cylinder is approximately 0.33 inches, a first one of the ports being centered on a diameter line of the cylinder passing through the center of the vane slot and central axis of the cylinder and the second and third ports being located on opposite sides of said diameter line and having the transverse center lines of the second and third ports between 96.degree. and 116.degree. from where said diameter line passes through the first one of the ports, and
• welding the cylinder outer wall to the casing in alignment with the transverse center line of each port.