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Ejector cycle system

Inactive Publication Date: 2007-01-04
DENSO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0021] It is another object of the present invention to provide an ejector cycle system, which can effectively return oil into a compressor.
[0037] According to a further another aspect of the present invention, an operation method for an ejector cycle system includes: passing refrigerant through an ejector and passing refrigerant through an evaporator by a suction force of the ejector; detecting a controllable factor for determining a staying of oil in the evaporator during the passing step; and causing oil to flow down from the evaporator when the controllable factor is not in a predetermined range. Accordingly, it can restrict oil from staying in the evaporator.

Problems solved by technology

In this case, a problem arises in the conventional cycle.

Method used

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Examples

Experimental program
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first embodiment

[0069]FIG. 1 illustrates an example in which an ejector cycle system 10 of the first embodiment is applied to a refrigerator device for vehicles. The refrigerator device for vehicles in this embodiment is so constructed as to lower the temperature inside a compartment to a very low temperature close to −20° C., for example.

[0070] In the ejector cycle system 10, a compressor 11 sucks in, compresses, and discharges refrigerant. The compressor 11 is rotationally driven by an engine for vehicle running (not shown) through an electromagnetic clutch 11a and a belt. This embodiment uses a swash plate-type variable displacement compressor whose discharge capacity can be continuously and variably controlled by external control signals.

[0071] More specific description will be given. The pressure in a swash plate chamber (not shown) is controlled utilizing the discharge pressure and the inlet pressure of the compressor 11. Thus, the angle of inclination of the swash plate is varied to change...

second embodiment

[0113] In the first embodiment, the variable throttling mechanism 14 is located between the branch portion Z and the ejector 15, and the fixed throttle 19 is located in the branch passage 18. In the second embodiment, as illustrated in FIG. 2, the variable throttling mechanism 14 and the fixed throttle 19 are disused, and a variable throttling mechanism 30 is provided in the branch passage 18.

[0114] The variable throttling mechanism 30 is a thermal expansion valve that adjusts the refrigerant flow rate so that the degree of superheat of refrigerant on the outlet side of the first evaporator 16 approaches a predetermined value. The construction of the thermal expansion valve can be the same as in the first embodiment. That is, the valve body of the variable throttling mechanism 30 makes a means for adjusting the flow ratio (η), and the temperature sensitive cylinder and equalizing pipe of the variable throttling mechanism 30 make a means for detecting the physical quantities related...

third embodiment

[0117] In the first embodiment, the variable throttling mechanism 14 is located between the branch portion Z and the ejector 15. In this third embodiment, as illustrated in FIG. 3, the variable throttling mechanism 14 shown in FIG. 1 is disused, and a variable throttling mechanism 31 is provided between the liquid receiver 13 and the branch portion Z.

[0118] The variable throttling mechanism 31 is a thermal expansion valve that adjusts the refrigerant flow rate so that the degree of superheat of refrigerant on the outlet side of the first evaporator 16 approaches a predetermined value. The construction of the thermal expansion valve is the same as in the first embodiment. That is, the valve body of the variable throttling mechanism 31 is a means for adjusting the refrigerant flow rate of the entire cycle; and the temperature sensitive cylinder and equalizing pipe of the variable throttling mechanism 31 are a means for detecting the physical quantities related to the state of refrige...

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Abstract

An ejector cycle system with a refrigerant cycle through which refrigerant flows includes an ejector disposed downstream of a radiator, a first evaporator that evaporates refrigerant flowing out of the ejector, a throttling unit located in a branch passage and depressurizes refrigerant to adjust a flow rate of refrigerant, and a second evaporator located downstream of the throttling unit. In the ejector cycle system, a flow ratio adjusting means adjusts a flow ratio between a first refrigerant flow amount depressurized and expanded in a nozzle portion of the ejector and a second refrigerant flow amount drawn into a refrigerant suction port of the ejector, based on a physical quantity related to at least one of a state of refrigerant in the refrigerant cycle, a temperature of a space to be cooled by the first and second evaporators, and an ambient temperature of the space.

Description

CROSS REFERENCE TO RELATED APPLICATION [0001] This application is based on Japanese Patent Applications No. 2005-191156 filed on Jun. 30, 2005, No. 2005-233169 filed on Aug. 11, 2005, and No. 2005-237651 filed on Aug. 18, 2005, the contents of which are incorporated herein by reference in its entirety. FIELD OF THE INVENTION [0002] The present invention relates to an ejector cycle system having an ejector that functions as a refrigerant pressure reducing means and a refrigerant circulating means. BACKGROUND OF THE INVENTION [0003] Ejector cycle systems provided with multiple evaporators have been conventionally known as in JP Patent No. 3322263 (corresponding to U.S. Pat. No. 6,574,987, U.S. Pat. No. 6,477,857). [0004] As illustrated in FIG. 26, a first evaporator 16 is connected downstream of an ejector 15 with respect to a refrigerant flow. An accumulator 32 that forms a vapor-liquid separator is located downstream of the first evaporator 16 with respect to the refrigerant flow. F...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): F25B19/02F25B49/00F25B1/06
CPCF25B9/008Y02B30/743F25B40/00F25B41/00F25B49/02F25B2309/061F25B2341/0011F25B2341/0012F25B2400/12F25B2500/19F25B2600/023F25B2600/112F25B2600/2513F25B2700/19F25B2700/1933F25B2700/2102F25B2700/21151F25B31/002B60H2001/3298Y02B30/70
Inventor IKEGAMI, MAKOTOOSHITANI, HIROSHIYAMADA, ETSUHISAISHIZAKA, NAOHISATAKEUCHI, HIROTSUGUSUGIURA, TAKEYUKIMAEHARA, TAKUO
Owner DENSO CORP
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