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Vapor-compression refrigerant cycle system with ejector

A circulation system and high-pressure refrigerant technology, which is applied in the direction of irreversible cycle compressors, refrigerators, compressors, etc., can solve the problems of compressor lubricating oil shortage, lubricating oil return reduction, etc.

Active Publication Date: 2006-04-05
DENSO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this case, the return of lubricating oil to the compressor is reduced, causing a shortage of lubricating oil in the compressor

Method used

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  • Vapor-compression refrigerant cycle system with ejector
  • Vapor-compression refrigerant cycle system with ejector
  • Vapor-compression refrigerant cycle system with ejector

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0032] In the first embodiment, figure 1 The vapor-compression refrigerant cycle system with ejector shown in is commonly used for example in vehicle air conditioners. The vapor-compression refrigerant cycle system includes a main refrigerant path 15 in which the refrigerant flows from the discharge side of the compressor 10, the refrigerant cooler 11, the flow control valve 12, the ejector 13, the first evaporator 14, and the compressor 10 Sequential flow on the suction side.

[0033] In this embodiment, the vehicle engine drives and rotates the compressor 10 through a belt, an electromagnetic clutch 10a, and the like. The operation of the compressor 10 is switched and controlled by the electromagnetic clutch 10a. In this case, by controlling the on / off operation ratio of the compressor 10, the refrigerant discharge capability of the compressor 10 may be controlled.

[0034] The refrigerant cooler 11 cools the high-pressure refrigerant discharged from the compressor 10 by ...

no. 2 example

[0070] In the first embodiment described above, the refrigerant suction port 13c of the ejector 13 is provided at the upper portion of the casing 13d. However, in the second embodiment, as Figure 4 As shown in , the refrigerant suction port 13c is provided at the lower portion of the housing 13d, and an upstanding portion 25a extending in the vertical direction is formed in the downstream portion of the refrigerant suction pipe 25. The upright portion 25 a may vertically extend upward from the lowermost portion of the injector 13 by a predetermined height. exist Figure 4 In, H2 represents the height of the upright portion 25a extending vertically.

[0071] In the present embodiment, the lower tube portion downstream of the upright portion 25a in the refrigerant suction pipe 25 can be made shorter. Therefore, even when the refrigerant suction portion 13c is provided at the lower portion (for example, the bottom) of the housing 13d, the amount of lubrication remaining in th...

no. 3 example

[0075] Figure 5 A vapor compression refrigerant cycle system of a third embodiment is shown. In the third embodiment, the solenoid valve 19 is not provided in the first branch passage 17 , and the refrigerant flowing out of the main refrigerant circulation path 15 flows into the second evaporator in the first branch part 17 after passing through the throttling mechanism 20 . Device 21. Therefore, when the compressor 10 operates, the refrigerant always flows into the second evaporator 21 in the first branch passage 17 .

[0076] Therefore, in the present embodiment, when the refrigerator function (refrigerator cooling operation) is stopped, the operation of the second blower 22 is also stopped. When the second blower 22 is stopped, the heat absorption of the refrigerant in the second evaporator 2 is very small, and a large amount of liquid refrigerant that has passed through the throttling mechanism 20 is sucked into the refrigerant suction port of the ejector 13 without bei...

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PUM

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Abstract

A vapor-compression refrigerant cycle system having an ejector includes a first evaporator for evaporating refrigerant from a pressure-increasing portion of the ejector, and a second evaporator for evaporating refrigerant to be drawn into a refrigerant suction port of the ejector. Furthermore, a valve member for opening and closing a refrigerant passage of the second evaporator is arranged in serious with the second evaporator in a refrigerant flow, and refrigerant flowing out of the second evaporator flows into the refrigerant suction port through a refrigerant suction pipe. The system is provided to restrict lubrication oil contained in refrigerant from being introduced from the ejector into and staying in the refrigerant suction pipe when the valve member is closed. For example, the refrigerant suction port is provided at an upper side of the ejector.

Description

technical field [0001] The present invention relates to a vapor compression refrigerant cycle system having an ejector serving as a refrigerant decompression unit and a refrigerant cycle unit. The vapor-compression refrigerant cycle system is suitable, for example, as an air conditioner for vehicles. Background technique [0002] A vapor compression refrigerant cycle system (ejector cycle system) using an ejector as a refrigerant decompression unit and a refrigerant cycle unit is exemplified in JP-B1-3322263 (corresponding to U.S. Patent No. 6,574,987 and U.S. Patent No. 6,477,857 ) are described. For example, in this vapor compression refrigerant cycle system, the first evaporator is provided between the ejector and the gas-liquid separator located downstream of the ejector, and the second evaporator is provided on the liquid refrigerant outlet side of the gas-liquid separator and the refrigerant suction port of the ejector. [0003] The inventors of the present applicat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F25B9/08F25B1/00
Inventor 小松博文小林捨夫押谷洋草野胜也
Owner DENSO CORP
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