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Title:
AIR CONDITIONER FOR RAILWAY VEHICLE
Document Type and Number:
Japanese Patent JP2009210213
Kind Code:
A
Abstract:

To provide an air conditioner for a railway vehicle achieved in a refrigerating cycle for keeping discharge pressure at overloading within operation pressure range without stopping a compressor.

A solenoid valve 6 opening and closing a bypass circuit is provided in bypass piping 101 connecting a discharge side of the compressor 1 and a heat transfer tube of an evaporator 4. When the discharge pressure of the compressor 1 reaches allowable pressure and a pressure switch 9 is operated, the solenoid valve 6 is opened, and one part of a high-temperature/high-pressure gas coolant of the compressor 1 is made to bypass a condenser 2 and sent to the evaporator 4. Since the bypassed high-temperature/high-pressure gas coolant is lowered in temperature and pressure by a decompression cooling function in the evaporator 4, a rise of the discharge pressure of the compressor 1 at overloading can be suppressed without raising an intake gas temperature of the compressor 1, the stop of in-vehicle air conditioning service caused by the operation stop of the compressor 1 is avoided, and a rapid rise in in-vehicle temperature can be prevented.


Inventors:
HIRAKAWA HARUO
AKEMARU DAISUKE
Application Number:
JP2008054943A
Publication Date:
September 17, 2009
Filing Date:
March 05, 2008
Export Citation:
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Assignee:
HITACHI LTD
International Classes:
F25B1/00; B61D27/00; F25B41/04; F28F27/02
Attorney, Agent or Firm:
Patent Business Corporation Daiichi International Patent Office