The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 14, 1991
Filed:
Mar. 06, 1990
Hoshizaki Denki Kabushiki Kaisha, Aichi, JP;
Abstract
A refrigeration system in an ice making machine has an evaporator coil connected at its inlet side to an outlet of a refrigeration compressor through a condensing coil and at its outlet side to an inlet of the compressor. An expansion valve is interposed between the condensing coil and the evaporator coil. A bypass line is connected in parallel with the condensing coil and the expansion valve. A solenoid valve is disposed within the bypass line to permit the flow of hot gas supplied therethrough from the compressor into the evaporator coil when it has been energized. The expansion valve is in the form of an expansion valve of the externally equalized type associated with an external equalizer pipe having an extremity connected to an intermediate portion of the evaporator coil between the inlet and outlet sides thereof. A thermostat bulb is located on a return line between the outlet side of the evaporator coil and the compressor. The thermostat bulb is filled with an amount of inert gas, which is determined to cause a maximum working pressure acting on the expansion valve, which is higher than the pressure of refrigerant at the intermediate portion of the evaporator coil during the freezing cycle and which is lower than the pressure of hot gas at the intermediate portion of the evaporator coil during the defrost cycle.