Refrigerating capacity control device, a testing apparatus and a refrigerating control method using the device

Abstract

This invention hereof discloses a refrigerating capacity control device, a test apparatus and a refrigerating control method using the device. The refrigerating capacity control device comprises a compressor ( 2 ), a condenser ( 5 ), an evaporator ( 7 ), a controller ( 1 ), a pressure regulating valve ( 4 ), a throttling device ( 6 ), a control panel ( 13 ) for driving a hot-gas valve, and a hot-gas valve ( 11 ). The controller is connected with the hot-gas valve ( 11 ) through the control panel ( 13 ) for driving a hot-gas valve; the pressure regulating valve ( 1 ) is disposed between an outlet of the compressor ( 2 ) and an inlet of the condenser ( 5 ) that are arranged in the refrigerating device; the throttling device ( 6 ) is disposed between an outlet of the condenser ( 5 ) and an inlet of the evaporator ( 7 ); one-end of the hot-gas valve ( 11 ) is disposed on a pipeline between the outlet of the compressor ( 2 ) and the front end of the pressure regulating valve ( 4 ), and the other end thereof is disposed on a pipeline that is between the throttling device ( 6 ) and an inlet of the evaporator ( 7 ).

What is claimed is: 
     
         1 . A refrigerating capacity control device comprising a refrigerating device, the refrigerating device including a compressor, an evaporator and a condenser, the compressor, the evaporator and the condenser being connected sequentially by pipelines;
 characterized by also comprising a controller, a pressure regulating valve, a throttling device, a control panel for driving a hot-gas valve and a hot-gas valve;   the pressure regulating valve being located between a discharge outlet of the compressor of the refrigerating device and an inlet of the condenser;   the throttling device being installed between an outlet of the condenser of the refrigerating device and an inlet of the evaporator;   the hot-gas valve having one end installed on a pipeline between the discharge outlet of the compressor and a front end of the pressure regulating valve, and another end installed on a pipeline between a location downstream from the throttling device and the inlet of the evaporator; and   the control panel for driving a hot-gas valve connecting the hot-gas valve to the controller.   
     
     
         2 . The refrigerating capacity control device according to  claim 1 , wherein the throttling device is a thermal expansion valve. 
     
     
         3 . The refrigerating capacity control device according to  claim 1 , wherein the throttling device is a capillary tube. 
     
     
         4 . The refrigerating capacity control device according to  claim 1 , wherein the throttling device is an electronic expansion valve. 
     
     
         5 . The refrigerating capacity control device according to  claim 1 , wherein the hot-gas valve is a continuously variable, electrically operated valve or an on/off solenoid valve. 
     
     
         6 . A testing apparatus incorporating the refrigerating capacity control device of  claim 1 , the testing apparatus comprising:
 a refrigerating capacity control device and a chamber or bath requiring temperature control;   the refrigerating capacity control device comprising a refrigerating device which comprises a compressor, an evaporator and a condenser, the compressor, the evaporator and the condenser being connected sequentially by pipelines;   the refrigerating capacity control device also comprising a controller, a pressure regulating valve, a throttling device, a control panel for driving a hot-gas valve and a hot-gas valve;   the pressure regulating valve being located between a discharge outlet of the compressor of the refrigerating device and an inlet of the condenser;   the throttling device being installed between an outlet of the condenser of the refrigerating device and an inlet of the evaporator;   the hot-gas valve having one end installed on a pipeline between the discharge outlet of the compressor and a front end of the pressure regulating valve, and another end installed on a pipeline between a location downstream from the throttling device and the inlet of the evaporator;   the control panel for driving a hot-gas valve connecting the hot-gas valve to the controller;   the evaporator being installed in the chamber or bath requiring temperature control;   a temperature sensor being installed in the chamber or bath requiring temperature control; and   the temperature sensor being connected to the controller.   
     
     
         7 . A refrigerating capacity control method utilizing the testing apparatus of  claim 6 , characterized by comprising:
 installing a pressure regulating valve between the compressor and the condenser of a traditional refrigerating device;   installing one end of a hot-gas valve on a pipeline between a discharge outlet of the compressor and a front end of the pressure regulating valve, and another end of the hot-gas valve on a pipeline between a location downstream from the throttling device and an inlet of the evaporator;   connecting the hot-gas valve to the controller by using a control panel for driving a hot-gas valve;   installing a throttling device between an outlet of the condenser of the refrigerating device and the inlet of the evaporator;   wherein the pressure regulating valve is used to maintain a stable discharge pressure and a hot-gas temperature to avoid the discharge pressure being affected by switching-on or switching-off of the hot-gas valve;   wherein the throttling device is used to control independently the evaporating temperature and degree of superheat; and   wherein the hot-gas valve releases directly the hot vapor from the discharge outlet of the compressor according to its opening setting, the pressure regulating valve reduces the output of the refrigerating system by restricting the refrigerant entering the condenser, and thereby heating and refrigerating capacity is effectively controlled and the temperature is precisely maintained at a set value.