JPH0526522A - Freezing cycle - Google Patents

Abstract

PURPOSE:To improve constantly stable cooling capacity even when a freezing cycle is mounted on any vehicle. CONSTITUTION:An ejector 4 and a separator 5 are disposed on the downstream of a refrigerant condenser. The ejector 4 and the separator 5 are mounted on the upper part of a refrigerant compressor 2 and assembled integrally with the refrigerant compressor 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerating cycle used for room air conditioners, vehicle air conditioners and the like.

[0002]

2. Description of the Related Art Conventionally, a gas injection cycle for improving the cooling capacity has been proposed. In this cycle, an ejector and a separator are provided downstream of the refrigerant condenser, the ejector sucks the gas refrigerant vaporized in the refrigerant evaporator, and the separator uses the gas-liquid two-phase refrigerant introduced from the ejector as the gas refrigerant. And liquid refrigerant.
The liquid refrigerant separated by the separator is supplied to the refrigerant evaporator and evaporated, and then sucked again by the ejector, and the gas refrigerant is sucked by the refrigerant compressor through the injection passage.

As a result, the refrigerant circulation amount of the refrigerant compressor increases, the effective liquid refrigerant amount in the refrigerant evaporator increases, and the cooling capacity can be improved by increasing the enthalpy difference.

[0004]

However, when the above refrigeration cycle is mounted on a vehicle, there are restrictions on the mounting. Therefore, the mounting position of each functional component forming the refrigeration cycle depends on the vehicle type. Be changed. For this reason, the resistance between the ejector and the separator and the resistance between the separator and the refrigerant compressor differ depending on the mounting positions of the ejector and the separator with respect to the refrigerant compressor. Therefore, when any of the above resistances increases and the pressure loss increases, the increase in the refrigerant circulation amount in the refrigerant evaporator due to the increase in the suction pressure of the refrigerant compressor is suppressed, and the expected cooling capacity is improved. There was a problem that it could not be done.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a refrigerating cycle which can always realize a stable improvement in cooling capacity even when mounted on any vehicle. Especially.

[0006]

In order to achieve the above object, the present invention provides a refrigerant compressor, a refrigerant condenser, and a refrigerant evaporator, which are arranged downstream of the refrigerant condenser, and An ejector that sucks the vaporized gas refrigerant, and a separator that separates the gas-liquid two-phase refrigerant flowing out from this ejector into a gas refrigerant and a liquid refrigerant, and the gas refrigerant separated by this separator is sucked by the refrigerant compressor. In the refrigeration cycle in which the liquid refrigerant is piped so as to be guided to the refrigerant evaporator, the refrigerant compressor, the ejector, and the separator are integrated as a technical means.

[0007]

In the refrigeration cycle of the present invention having the above-described structure, the refrigerant compressor, the ejector and the separator are integrated, so that the resistance between the ejector and the separator and the separator can be improved even when the types of vehicles mounted are different. The resistance between the refrigerant compressor and the refrigerant compressor is always constant. Further, since the passage lengths between the ejector and the separator and between the separator and the refrigerant compressor are shortened as compared with the case where the refrigerant compressor, the ejector, and the separator are separately arranged, the pressure loss is reduced. It

[0008]

EXAMPLE An example of the refrigerating cycle of the present invention will be described below with reference to FIGS. FIG. 1 is a schematic diagram showing a state in which an ejector and a separator are integrally mounted on a refrigerant compressor, and FIG. 3 is a refrigeration cycle diagram of this embodiment. This refrigeration cycle 1 is used in a vehicle air conditioner, and as shown in FIG. 3, a refrigerant compressor 2, a refrigerant condenser 3,
The ejector 4, the separator 5, the flow rate adjustment valve 6, and the refrigerant evaporator 7 are functional components.

The refrigerant compressor 2 is driven by a vehicle running engine (not shown) via an electromagnetic clutch 8 (see FIG. 1) and compresses and discharges the sucked gas refrigerant. The refrigerant condenser 3 receives the air blown from the cooling fan 9 and condenses and liquefies the high-temperature, high-pressure refrigerant discharged from the refrigerant compressor 2.

The ejector 4 comprises a nozzle 4a for ejecting the refrigerant introduced from the refrigerant condenser 3 and a diffuser 4b for diffusing the refrigerant ejected from the nozzle 4a. A suction port 4c is provided on the side surface of the ejector 4, and is connected to the outlet of the refrigerant evaporator 7 via a communication pipe 10. In this ejector 4, by utilizing the pressure drop around the refrigerant ejected from the nozzle 4a, the gas refrigerant vaporized in the refrigerant evaporator 7 is sucked from the suction port 4c, and the gas refrigerant is mixed with the refrigerant ejected from the nozzle 4a. Then, the pressure is increased by the diffuser 4b.

The separator 5 is arranged downstream of the ejector 4 and separates the gas-liquid two-phase refrigerant flowing out of the ejector 4 into a gas refrigerant and a liquid refrigerant. Is sucked into the refrigerant compressor 2 from the path 5a,
The liquid refrigerant flows from the liquid outflow passage 5b to the flow rate adjusting valve 6.

The flow rate adjusting valve 6 adjusts the flow rate of the liquid refrigerant flowing from the separator 5 to the refrigerant evaporator 7.

The refrigerant evaporator 7 evaporates the refrigerant by exchanging heat between the low temperature and low pressure refrigerant and the air in the passenger compartment. The air cooled by heat exchange with the refrigerant is blown into the vehicle compartment by receiving the air blow from the blower 11.

The refrigerating cycle 1 of the present embodiment having the above structure
The ejector 4 and the separator 5 are the same as those shown in FIGS.
As shown in (A view of FIG. 1), the refrigerant compressor 2 is mounted on the upper part and integrally assembled. Note that FIG.
In the figure, reference numeral 2 a is a gas discharge port of the refrigerant compressor 2.

Next, the operation of this embodiment will be described. The high-temperature, high-pressure gas refrigerant compressed by the refrigerant compressor 2 is
It is condensed and liquefied by exchanging heat with the air outside the vehicle in the refrigerant condenser 3. The condensed and liquefied high-pressure liquid refrigerant is mixed with the gas refrigerant ejected from the nozzle 4a of the ejector 4 and sucked from the suction port 4c, and the pressure is increased by the diffuser 4b.

The gas-liquid two-phase refrigerant flowing out of the ejector 4 is separated into a gas refrigerant and a liquid refrigerant by the separator 5, the gas refrigerant is sucked by the refrigerant compressor 2, and the liquid refrigerant is flown by the flow rate adjusting valve 6. The flow rate is adjusted and supplied to the refrigerant evaporator 7.
The gas refrigerant that has undergone heat exchange with the vehicle interior air in the refrigerant evaporator 7 and is evaporated is again sucked into the ejector 4.

In this way, by sucking the gas refrigerant vaporized in the refrigerant evaporator 7 into the ejector 4, the refrigerant circulation amount in the refrigerant compressor 2 is reduced and the refrigerant evaporator 7 is
The cooling capacity can be improved by increasing the circulation amount of the refrigerant inside.

In this embodiment, the ejector 4 and the separator 5 are integrally combined to form the refrigerant compressor 2
Since it is mounted on the upper part of the compressor, the space between the ejector 4 and the separator 5 and the separator 5 and the refrigerant compressor 2 are
The length of the refrigerant passage between and is shortened, and the pressure loss is reduced. Further, due to the integration, the resistance between the ejector 4 and the separator 5 and the separator 5 and the refrigerant compressor 2 are different even if the refrigeration cycle 1 is mounted on a different vehicle type.
The resistance between and is always constant.

Here, the refrigeration cycle 1 of this embodiment in which the ejector 4 and the separator 5 are integrated with the refrigerant compressor 2,
The cooling capacity is compared between the ejector cycle that is not integrated and the normal receiver cycle that does not use the ejector 4, and the results are shown in FIGS. 4 and 5.

FIG. 4 is a graph showing the effect of improving the cooling capacity with respect to the pressure loss. The receiver cycle (pressure loss: about 0.4) and the ejector cycle (when not integrated) reduce the pressure loss. Along with this, a cooling capacity improvement of about 5% can be obtained, but in the refrigeration cycle 1 of the present embodiment, compared with the ejector cycle which is not integrated,
In addition, a cooling capacity improvement of 9.5% can be obtained.

In the comparison of the cooling capacity with respect to the rotation speed of the refrigerant compressor 2 shown in FIG. 5, in the case of the refrigeration cycle 1 of this embodiment, the rotation speed in the idling state (about 800 rpm).
Thus, it is possible to obtain a cooling capacity improvement of 14.5% for the receiver cycle and 9.5% for the ejector cycle that is not integrated.

Next, a second embodiment of the present invention will be described. FIG. 6 is a refrigeration cycle diagram of this embodiment. The refrigeration cycle 1 is a heat pump cycle that can perform cooling / heating operation by switching the circulation direction of the refrigerant using the two four-way valves 12 and 13. In addition, in FIG. 6, the four-way valve 1
The numbers of the functional components other than 2 and 13 are the same as those in the first embodiment.

By integrating the ejector 4 and the separator 5 with the refrigerant compressor 2 in the heat pump cycle as in this embodiment, it is possible to improve the heating capacity as well as the cooling capacity. The flow of the refrigerant during the cooling operation is indicated by the solid line arrow in the figure, and the flow of the refrigerant during the heating operation is indicated by the broken line arrow in the figure.

The refrigeration cycle of the present invention includes an ejector,
By integrating the separator and the refrigerant compressor, it is possible to always realize a stable improvement of the cooling capacity even when there are restrictions on mounting depending on the vehicle type.

[Brief description of drawings]

FIG. 1 is a schematic diagram in which an ejector and a separator are integrated with a refrigerant compressor.

FIG. 2 is a view from A of FIG.

FIG. 3 is a refrigeration cycle diagram of the present embodiment.

FIG. 4 is a graph showing a comparison of cooling capacities.

FIG. 5 is a graph showing a comparison of cooling capacities.

FIG. 6 is a refrigeration cycle diagram showing a second embodiment of the present invention.

[Explanation of symbols]

 1 Refrigeration cycle 2 Refrigerant compressor 3 Refrigerant condenser 4 Ejector 5 Separator 7 Refrigerant evaporator

Claims (1)

Claim: What is claimed is: 1. A refrigerant compressor, a refrigerant condenser, and a refrigerant evaporator, and an ejector arranged downstream of the refrigerant condenser for sucking gas refrigerant vaporized in the refrigerant evaporator. The gas-liquid two-phase refrigerant flowing out from the ejector is provided with a separator for separating the gas refrigerant and the liquid refrigerant, the gas refrigerant separated by the separator is sucked by the refrigerant compressor, and the liquid refrigerant is guided to the refrigerant evaporator. A refrigeration cycle in which the refrigerant compressor, the ejector, and the separator are integrated in a refrigeration cycle that is piped in such a manner.