Crankshaft for three cylinder rotary compressor

[0035] Figure 5 ~ Figure 7 Shown is one of the embodiments of the present invention, including main shaft 1 and bellcrank, as Figure 5 As shown, there are three crank throws, starting from the short axis end of the crankshaft, they are the lower crank throw 4, the middle crank throw 3 and the upper crank throw 2, and they are integrally arranged with the main shaft 1. The distance between two adjacent crank throws is D Equal, the main shaft 1 is one-piece. In order to make the piston fully pass through the first bell crank, then move radially and insert the next bell crank. Such as Figure 6As shown, the distance D between two adjacent crank throws is greater than the height A of the compressor piston 6, and the axial width C of the crank throw is smaller than the thickness B of the partition plate 5 between the compressor pistons. In this way, the middle piston can be inserted from both sides of the crankshaft, so the two middle partitions can be designed with the same s...

[0039] Figure 8 ~ Figure 12 Shown is the second embodiment of the present invention, which differs from the first embodiment in that the main shaft is disconnected between the lower bell crank 4 and the middle bell crank 3 (also between the middle bell crank 3 and the upper bell crank 2) The long axis 11 and the short axis 12 are two-stage, so that the design method and design points of the previous single-cylinder crankshaft and double-cylinder crankshaft can be completely followed. The compactness, the thickness of the partition is not limited by the thickness of the crank throw. Such as Figure 8 As shown, the crank throws are arranged on the main shaft, the distance between two adjacent crank throws is equal, and the phase angle between the crank throws is 120°. During assembly, the major axis 11 can be assembled first, and then the minor axis 12 can be pressed in, such as Figure 9 As shown, the major axis 11 and the minor axis 12 can be closely fitted and embedded at...

[0042] Figure 13 and Figure 14 Shown is the third embodiment of the present invention, which differs from embodiment two in that: as Figure 13 As shown, the major shaft 11 and the minor shaft 12 are sleeved with a sleeve 13 on the outer side of the disconnected part, that is, the fast connection is realized through the sleeve 13 . Such as Figure 14 As shown, the sleeve 13 can be a hollow cylindrical metal part, the inner diameter of which is slightly smaller than the outer diameter of the disconnection between the major axis 11 and the minor axis 12 in a cold state. When assembling, first heat the sleeve 13 to a certain temperature. Due to the principle of thermal expansion and contraction, the inner diameter of the sleeve will be slightly larger than the outer diameter of the disconnected part of the long and short shafts, and then the long and short shafts will be separated from the Both ends of the sleeve are inserted, and when the temperature of the sleeve 13 drops,...