Variable-diameter pulsating heat pipe phase change heat storage device and heat conduction strengthening method thereof

The invention provides a variable-diameter pulsating heat pipe phase change heat storage device and a heat conduction strengthening method thereof. The heat storage device comprises a shell, a heating chamber, a heat storage chamber, a condensation chamber and a variable-diameter pulsating heat pipe. The heating chamber, the heat storage chamber, the condensation chamber and the variable-diameter pulsating heat pipe are all located in the shell. The variable-diameter pulsating heat pipe is different in diameter in the three chambers. Two holes are formed at the side portion of the heating chamber and are connected with pipelines, so that heat working medium fluid enters and is discharged; and two holes are formed at the side portion of the condensation chamber to be connected with pipelines so that cold working medium fluid can enter and be discharged. A square hole is formed in the front of the heat storage chamber and used for placing and taking out the phase change material, heat absorption, storage, trans