Abstract: The present disclosure provides a pump body assembly, a heat exchange apparatus, a fluid machine and an operating method thereof. The pump body assembly includes a piston, a shaft, a piston sheath, and a cylinder. The shaft drives the piston to rotate and reciprocate within the piston sheath while rotating. The piston sheath is located in the cylinder, and a compression chamber is defined between an outer circumferential wall of the piston and an inner wall of the cylinder. A pressure relief recess is defined in the outer circumferential wall of the piston or the inner wall of the cylinder at a position corresponding to the compression chamber.

Abstract: The present disclosure is related to systems and methods for operating a lock in a vehicle. The method includes obtaining and verifying a request to use a vehicle, if the request to use the vehicle satisfies a condition for using the vehicle, open a lock of the vehicle. The method also includes obtaining a request to temporarily close the lock of the vehicle, close the lock of the vehicle. The method further includes obtaining a request to abort the request to temporarily close the lock of the vehicle, open the lock of the vehicle. The method still further includes obtaining and verifying a request to return the vehicle, if the request to return the vehicle satisfies a condition for returning the vehicle, close the lock of the vehicle.