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Refrigeration unit

a technology for refrigerating units and refrigeration units, which is applied in the direction of refrigeration machines, vehicle heating/cooling devices, and refrigerating safety arrangements. it can solve the problems of sensor not being able to detect refrigerant leakage and inability to detect leakag

Inactive Publication Date: 2006-03-09
SANDEN CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0007] An object of the present invention is to provide a refrigeration unit capable of detecting a refrigerant leak without fail and warning the user, the supervisor or the like.
[0010] In a preferred embodiment, a receiver is interposed in the liquid-flowing area, and the detector is disposed downstream from the receiver. In this embodiment, in the event of a refrigerant leak, a gaseous refrigerant is produced in the liquid-flowing area located downstream from the receiver. However, if the refrigeration unit is operated in proper working order, the receiver removes the gaseous refrigerant, so that the gaseous refrigerant is never present in the liquid-flowing area located downstream from the receiver. Consequently, the detector is prevented from making a false detection of a refrigerant leak when the refrigeration unit is in normal operation.

Problems solved by technology

When the gas sensor is used, however, even in the event of a refrigerant leak, it is impossible to detect the leak unless the gas density increases in the vicinity of the gas sensor.
For this reason, there is the possibility that the sensor could not detect the refrigerant leak.

Method used

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Examples

Experimental program
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Effect test

Embodiment Construction

[0020]FIG. 1 is a schematic view showing a configuration of a refrigeration unit according to one embodiment applied to an air conditioning system for a car.

[0021] The refrigeration unit has a circulation passage 6 extending from an engine room 2 of a vehicle through a dash panel 3 to a passenger compartment 4, the circulation passage 6 being filled with R-152a as refrigerant. A compressor 8 is interposed in a section of the circulation passage 6 located in the engine room 2, and is activated by a driving force of an engine 10. The compressor 8 sucks the refrigerant, as a working fluid, in a phase of a low-pressure gas through a suction port thereof, compresses the sucked refrigerant therein, and then discharges the compressed refrigerant in a phase of high-temperature and high-pressure gas through a discharge port thereof. In short, the compressor 8 creates a flow of the refrigerant in the circulation passage 6 while compressing the refrigerant.

[0022] A condenser 12 is interposed...

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PUM

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Abstract

A refrigeration unit applied, for example, to an air conditioning system for a car has a condenser, an expansion valve, and an evaporator interposed in a refrigerant circulation passage in the order named. The circulation passage includes a fluid-flowing area for a liquid refrigerant from the condenser to the expansion valve, and a gas-flowing area mainly for a gaseous refrigerant from the evaporator to the compressor. The refrigeration unit is provided with a detector for detecting the presence of the gaseous refrigerant in the liquid-flowing area. If the detector detects the gaseous refrigerant, a warning light indicative of a refrigerant leak is turned on.

Description

BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to a refrigeration circuit, and more specifically to a refrigeration circuit for an air conditioning system for a vehicle, which is suitable for use of a flammable refrigerant with low global warming potential. [0003] 2. Description of the Related Art [0004] In late years, the development of an environment-friendly air conditioning system has been advanced. This air conditioning system has a refrigeration circuit employing a refrigerant with low global warming potential. To be specific, refrigerants of this type include new alternatives for chlorofluorocarbon, such as R-152a, and HC gases, such as propane. [0005] Because of flammability of these gases, an air conditioning system of this type, especially a vehicle air conditioning system, is provided with a gas sensor for detecting a leaked refrigerant in order to assure the safety as disclosed, for example, in Unexamined Japanese Patent...

Claims

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Application Information

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IPC IPC(8): F25B49/00
CPCB60H1/00978B60H1/3217F25B2400/12F25B49/005B60H1/3225
Inventor KOMATSU, SHUNJI
Owner SANDEN CORP