Valveless lubricant pump for a lateral rotary compressor

Claim 1

A lateral rotary compressor comprising: a casing having a lubricating oil reservoir for storing lubricating oil; a rotary shaft disposed substantially horizontally in the casing; bearing means for rotatably journaling the rotary shaft to the casing; driving means provided at one end of the rotary shaft for rotating said shaft; a compressing mechanism provided at the other end of the rotary shaft, said mechanism including a blade chamber, a blade disposed in the blade chamber and reciprocally moveable between at least a first position whereat the blade chamber volume is increased to a maximum volume and a second position whereat the blade chamber volume is decreased to a minimum volume, and driving power transmitting means for reciprocally moving the blade in response to the rotation of the rotary shaft; and a supply tube having first and second ends, said first end of said tube communicating with said blade chamber, said second end of said tube communicating with said bearing means, the supply tube including means for defning an opening formed in a portion of said tube disposed within the lubricating oil reservoir, said opening having a diameter in the range of 1.5 mm to 3.5 mm, said blade chamber not communicating with the lubricating oil reservoir except via the supply tube, whereby as the blade is moved from the second position to the first position, the lubricating oil in the supply tube and the lubricating oil in the reservoir in proximity with the opening formed in the supply tube are sucked into the blade chamber, and as the blade is moved from the first position to the second position, the lubricating oil in the blade chamber and the lubricating oil in the reservoir in proximity with the opening formed in the supply tube are delivered to said bearing means.