Control method for heating unit, heating unit, and refrigerating and freezing apparatus

A heating unit, comprising:

• a cylinder, configured to contain an item to be treated;
• an electromagnetic wave generation system, at least one part thereof being disposed in the cylinder or accessed into the cylinder to generate an electromagnetic wave in the cylinder to heat the item to be treated, and the electromagnetic wave generation system comprising an electromagnetic wave generation module configured to generate an electromagnetic wave signal and a cooling fan configured to cool the electromagnetic wave generation module;
• and
• a controller, configured to execute the following steps:
• acquiring a forward power signal output from the electromagnetic wave generation module and a reverse power signal returned to the electromagnetic wave generation module;
• calculating an electromagnetic wave absorption rate of the item to be treated according to the forward power signal and the reverse power signal;
• and
• adjusting a rotation speed of the cooling fan according to a power value of the forward power signal, and the electromagnetic wave absorption rate,
• wherein the step of adjusting a rotation speed of the cooling fan according to a power value of the forward power signal, and the electromagnetic wave absorption rate comprises:
• matching with the rotation speed of the cooling fan on the basis of a preset rotation speed correspondence relation according to the power value of the forward power signal, and the electromagnetic wave absorption rate,
• wherein the rotation speed correspondence relation records rotation speeds corresponding to power values in different ranges and electromagnetic wave absorption rates in different ranges;
• and
• wherein under the condition that the power values of the forward power signal are the same, the rotation speed of the cooling fan is in negative correlation with an average value of the electromagnetic wave absorption rates in different ranges;
• and under the condition that the electromagnetic wave absorption rates are the same, the rotation speed of the cooling fan is in positive correlation with an average value of the power values in different ranges.

A refrigerating and freezing apparatus, comprising:

• a cabinet and a heating unit, wherein the heating unit comprises:
• a cylinder, disposed in the cabinet, and configured to contain an item to be treated;
• and
• an electromagnetic wave generation system, at least one part thereof being disposed in the cylinder or accessed into the cylinder to generate an electromagnetic wave in the cylinder to heat the item to be heated, wherein the electromagnetic wave generation system comprises:
• an electromagnetic wave generation module, configured to generate an electromagnetic wave signal;
• and
• a power supply module, configured to provide electric energy for the electromagnetic wave generation module;
• and the heating unit further comprises:
• at least one cooling fan, disposed to cool the electromagnetic wave generation module and the power supply module;
• wherein the refrigerating and freezing apparatus further comprises:
• a housing, disposed to cover the electromagnetic wave generation module, the power supply module and the at least one cooling fan;
• and
• a separator, disposed in the housing and located on a side of the at least one cooling fan away from the electromagnetic wave generation module to separate a space in the housing into an air inlet area and an air outlet area,
• wherein the at least one cooling fan and the electromagnetic wave generation module are disposed in the air outlet area;
• and
• wherein the air inlet area and the air outlet area are respectively provided with at least one air inlet and at least one air outlet in a circumferential direction of the at least one cooling fan, and at least one air vent is formed in a position of the separator corresponding to the at least one cooling fan.