US 12,018,681 B1
Oil box device of a roots vacuum pump with a crossed cooling water tube set
Raymond Zhou Shaw, Shanghai (CN); and Guichun Zhang, Shanghai (CN)
Assigned to ELIVAC INC.; ELIVAC CO., LTD; and RAYMOND Z. SHAW, Salisbury, MD (US)
Filed by Raymond Zhou Shaw, Shanghai (CN); and Guichun Zhang, Shanghai (CN)
Filed on May 16, 2023, as Appl. No. 18/197,743.
Int. Cl. F04C 15/00 (2006.01); F04C 2/12 (2006.01); F04C 13/00 (2006.01); F04C 18/12 (2006.01); F04C 18/14 (2006.01); F04C 25/02 (2006.01); F04C 29/04 (2006.01); F28D 1/04 (2006.01); F28D 1/047 (2006.01)
CPC F04C 15/0096 (2013.01) [F04C 2/126 (2013.01); F04C 13/00 (2013.01); F04C 18/126 (2013.01); F04C 18/14 (2013.01); F04C 25/02 (2013.01); F04C 29/04 (2013.01); F28D 1/04 (2013.01); F28D 1/047 (2013.01)] 9 Claims
OG exemplary drawing
 
1. An oil box device of a roots vacuum pump with a crossed cooling water tube set, comprising:
an oil box (100) formed by a roots pump rear cover (1) and an end cover (5); the rear cover and the end cover being formed as a cavity;
two roots vacuum pump transfer gears (4) placed within the oil box (100); the two gears being engaged with one another so that rotation of one gear will drive the other gear to rotate; each gear being axially connected to a respective one of shafts of rotors of the roots vacuum pump; one of the shafts of the rotors being driven by another one of the shafts of the rotors;
a multiple channel crossed cooling water tube set (2) enclosing the two roots vacuum pump gears (4) and being within the oil box; the cooling water tube set (2) being formed with a plurality of parallel water tubes; two distal ends of the water tube set being crossed over one another;
two water boxes (6) installed at two ends of the water tube set (2); after assembly, the water tube set enclosing the two gears and two ends of the water tube set being crossed over each other at a lateral side of the two gears;
two joints (3) installed at a bottom side of the rear cover (1) so that water flows into or out of the water tube set through the joints, the two joints passing through two through holes of the rear cover and then being connected to the water boxes so that the water tube set is tightly connected to the rear cover; and
wherein after assembly, the two gears are arranged at an inner side of the water tube set so that the water tube set and the water boxes can dissipate heat of the gears; therefore, cooling water can flow into one of the joints; then flow to one of the two water boxes, then flow to the water tube set; then to the other water box, then to the other joint and flow out from the other joint.