Patent ID: 11971031
Assignee: GREE ELECTRIC APPLIANCES, INC. OF ZHUHAI
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F | IPC F

Claim 11:
12. The pump body assembly according to claim 6, wherein the number of the pressure relief groove is one, and the pressure relief groove extends along a circumferential direction of the piston; or
the number of the pressure relief grooves is two, and the two pressure relief grooves are crossed; or
the number of the pressure relief grooves is three, and the three pressure relief grooves are in a shape of H; or
the number of the pressure relief grooves is three, and the three pressure relief grooves are in a shape of I; or
the number of the pressure relief grooves is plural, and the pressure relief grooves are in a fishbone shape; or
the number of the pressure relief grooves is two, wherein a first pressure relief groove extends along a circumferential direction of the piston, and a second pressure relief groove has a ring shape and is crossed with the first pressure relief groove.