Patent ID: 9127811
Filing Date: 2015-09-08
Classification: F15B,F17C

Abstract:
1. A hydraulic accumulator comprising a hollow pressure shell defined by a generally annular sidewall, said shell having a first end, a second end, and a longitudinal axis extending between the first end and the second end, said sidewall being generally symmetrical around the longitudinal axis, said first end being opposite from the second end, said sidewall having a first generally cylindrical section positioned at the first end and defining a shell first end opening, a second generally cylindrical section positioned at the second end and defining a shell second end opening, and a third generally cylindrical mid section positioned between the first end and the second end, said mid section having a larger inside diameter than the first end section and the second end section, a first generally frustoconical section connecting the first end section to the mid section, and a second frustoconical section connecting the second end section to the mid section, said generally cylindrical sections having generally cylindrical inside and outside surfaces, and said generally frustoconical sections having generally frustoconical inside and outside surfaces, a rod positioned axially in the hollow pressure shell, said rod having a first end and a second end, a first end seal carried by the rod near the first end of the rod sealing the first end of the shell, a second end seal carried by the rod sealing the second end of the shell, a tubular expandable bladder having a first end and a second end mounted around the rod and extending from near the first end of the shell to near the second end of the shell, the first end of the bladder being sealingly attached to the rod near first end seal, the second end of the bladder being sealingly attached to the rod near the second end seal, a first chamber having an annular cross section for gas being formed between the rod and the bladder, a second chamber having an annular cross section for liquid being formed between the bladder and the shell, a first flow passage being formed through an end seal communicating with the first chamber, a second flow passage being formed though an end seal communicating with the second chamber.