Pressurizing booster compressor

Abstract

A method for preventing a pressure in a crank chamber from excessively increasing without leading to an increase in weight or cost or causing damage to a pressurizing booster compressor. A compression chamber is formed by a cylinder, a cylinder head, and a piston reciprocal inside the cylinder. Rotation of an output shaft of an electric motor causes the piston to reciprocate via a crank shaft. A sealed crank chamber is defined inside a crank case. A pressurized gas supply tube supplies pressurized gas to be compressed into each of the compression chamber and the crank chamber. The crank case is formed from a hollow cylindrical body and an end plate facing the outside. A low-strength wall (a partition wall having a lower strength than another partition wall), which is configure to be broken under an allowable maximum pressure of the crank chamber, is formed on the end plate.

1 - 6 . (canceled) 
     
     
         7 . A pressurizing booster compressor comprising:
 a cylinder;   a cylinder head provided on the cylinder;   a piston reciprocatable inside the cylinder, the piston defining a compression chamber together with the cylinder head and the cylinder;   a crank shaft coupled with the piston;   a driving shaft configured to rotationally drive the crank shaft;   a crank case containing the crank shaft and defining a crank chamber isolated from an outside; and   a pressurized gas supply tube configured to supply pressurized gas to be compressed to each of the compression chamber and the crank chamber,   wherein the crank case includes a partition wall, and the partition wall includes a low-strength wall at a part thereof facing the outside, the low strength wall being configured to be broken under an allowable maximum pressure of the crank chamber.   
     
     
         8 . The pressurizing booster compressor according to  claim 7 , wherein the partition wall of the crank case comprises
 a hollow cylindrical body including an outer peripheral wall and an end wall forming one end surface with an opposite end surface open to the outside, and   an end plate fixed to the hollow cylindrical body and closing the opposite end surface, and   wherein the pressurized gas supply tube is connected to the end plate, and the end plate includes the low-strength wall formed at a different position from a position to which the pressurized gas supply tube is connected.   
     
     
         9 . The pressurizing booster compressor according to  claim 7 , wherein the low-strength wall includes a thinned portion, the thinned portion being formed on at least one of the partition wall facing an outside of the crank case and the end plate. 
     
     
         10 . The pressurizing booster compressor according to  claim 8 , wherein the low-strength wall includes a thinned portion, the thinned portion being formed on at least one of the partition wall facing an outside of the crank case and the end plate. 
     
     
         11 . The pressurizing booster compressor according to  claim 7 , wherein a through-hole is formed through at least one of the partition wall facing an outside of the crank case and the end plate, and
 wherein the low-strength wall includes   a low-strength plate having a strength that allows the low-strength plate to be broken under the allowable maximum pressure of the crank chamber, the low-strength plate being disposed in abutment with at least one of an outer surface of the partition wall and the end plate around the through-hole so as to shield the through-hole, and   a fixation member fixed to at least one of the outer surface of the partition wall and the end plate around the through-hole to fix the low-strength plate at a position that allows the low-strength plate to shield the through-hole.   
     
     
         12 . The pressurizing booster compressor according to  claim 8 , wherein a through-hole is formed through at least one of the partition wall facing an outside of the crank case and the end plate, and
 wherein the low-strength wall includes   a low-strength plate having a strength that allows the low-strength plate to be broken under the allowable maximum pressure of the crank chamber, the low-strength plate being disposed in abutment with at least one of an outer surface of the partition wall and the end plate around the through-hole so as to shield the through-hole, and   a fixation member fixed to at least one of the outer surface of the partition wall and the end plate around the through-hole to fix the low-strength plate at a position that allows the low-strength plate to shield the through-hole.   
     
     
         13 . The pressurizing booster compressor according to  claim 11 , wherein the fixation member is fixed in an attachable and detachable manner to at least one of the outer surface of the partition wall and the end plate around the through-hole. 
     
     
         14 . The pressurizing booster compressor according to  claim 12 , wherein the fixation member is fixed in an attachable and detachable manner to at least one of the outer surface of the partition wall and the end plate around the through-hole. 
     
     
         15 . The pressurizing booster compressor according to  claim 11 , wherein a space is formed between at least one of the outer surface of the partition wall and the end plate around the through-hole, and the fixation member, and
 wherein the low-strength plate has a wedge-like shape in cross-section, and is press fitted in the space to be fixed at the position that allows the low-strength plate to shield the through-hole.   
     
     
         16 . The pressurizing booster compressor according to  claim 12 , wherein a space is formed between at least one of the outer surface of the partition wall and the end plate around the through-hole, and the fixation member, and
 wherein the low-strength plate has a wedge-like shape in cross-section, and is press fitted in the space to be fixed at the position that allows the low-strength plate to shield the through-hole.