Axial sealing mechanism of volute compressor

In an axial volute compressor having

• a housing;
• a fixed volute member provided therein with a first number of spiral volute pieces and further provided centrally with a through outlet;
• and
• an orbiting volute member provided protuberantly with the first number of spiral volute pieces which can be assembled with said fixed volute member such that said orbiting volute member and said fixed volute member form therebetween a plurality of compression cheers, and that said orbiting volute member can be driven by an external force to revolve around said fixed volute member without being able to rotate on a rotation axis thereof so as to guide a low-pressure working fluid to enter said compression chambers in which said low-pressure working fluid is so compressed as to become an intermediate-pressure working fluid before being further compressed to become a high-pressure working fluid, which is then discharged via said outlet of said fixed volute member of the volute compressor;
• a sealing mechanism improvement comprising:
• an isolating member is fixed in said housing such that an interior of said housing is divided into a high-pressure receiving chamber and a low-pressure receiving chamber in communication with each other via a through hole disposed therebetween, said isolating member further including at least one back pressure chamber at a distance from a through-hole axis of said through hole located between said high-pressure receiving chamber and said low-pressure receiving chamber, said back pressure chamber being contiguous to said low-pressure receiving chamber;
• a neck portion is formed on an outlet peripheral edge of a discharge port of said fixed volute member disposed in said low-pressure receiving chamber, said neck portion being tubular in shape and dimensioned to fit into said through hole of said isolating member such that said neck portion is capable of making a micro-axial motion along the through-hole axis;
• a leakproof element disposed between said neck portion and said through hole of said isolating member for preventing said high-pressure working fluid located at outlet from leaking out to said low-pressure receiving chamber;
• at least one pressing member slidably disposed within said back pressure chamber and capable of making an axial motion parallel to said through-hole axis of said isolating member for engaging a back surface of said fixed volute member;
• wherein
• a compressed working fluid is guided through passage means into said back pressure chamber for actuating said pressing member to urge said back surface of said fixed volute member which is then caused to urge intensively said orbiting volute member so as to ensure that said orbiting volute member remains in a close axial contact with said fixed volute member at such time when said orbiting volute member is engaged in orbital motion, and that said compressed work fluid in each of said compression chambers is prevented from leaking out.