JP2002130874A - Refrigerating cycle device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize a refrigerating cycle device capable of supplying sufficient amount of lubricating oil to a compressor even when the operation of an ejector is continued for a long period of time. SOLUTION: The refrigerating cycle device is constituted of the compressor 100, a refrigerant radiator 200, an ejector 400 and a gas/liquid separator 500, which are connected annularly through a refrigerant pipeline 600, while the liquid phase refrigerant side of the gas/liquid separator 500 is connected to the suction part of the ejector 400 through a bypass pipeline 610 and an evaporator 300 is interposed on the half way of the bypass flow passage. In this case, the gas/liquid separator 500 is provided with a suction pipeline 520 for sucking the mixed refrigerant of gas and liquid, a gas phase refrigerant exit pipeline 530 opened in the gas phase section to discharge the gas-phase refrigerant to the suction side of the compressor 100, a liquid-phase refrigerant exit pipeline 540 opened in the liquid phase section to discharge the liquid-phase refrigerant to the suction side of the evaporator 300, and an oil returning circuit 510 for returning lubricant separated from the refrigerant stored in the gas/liquid separator 500 to the suction side of the compressor 100.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigeration cycle apparatus incorporating an ejector, and more particularly to a structure of a gas-liquid separator.

[0002]

2. Description of the Related Art In a refrigeration cycle apparatus incorporating an ejector, as disclosed in, for example, JP-A-6-11197, a refrigerant is decompressed and expanded, and a vapor-phase refrigerant evaporated in an evaporator is sucked. The compressor converts the expansion energy into pressure energy to increase the suction pressure of the compressor.

[0003]

By the way, in general, not only in a refrigeration cycle apparatus incorporating an ejector but also in a refrigeration cycle, lubrication in a compressor is performed by mixing lubricating oil (refrigeration oil) in a refrigerant. I have.

On the other hand, since the refrigerant evaporates in the evaporator,
Lubricating oil and refrigerant are easily separated. For this reason, in the invention described in the above publication, when the ejector is continuously operated for a long time, the lubricating oil accumulates in the evaporator side, and the lubricating oil adhered to the inner surface of the evaporator causes the lubricating oil shown in FIG. As described above, the heat absorbing capacity (refrigeration capacity) of the evaporator is reduced, and the amount of lubricating oil returning to the compressor is reduced, so that the compressor may not be sufficiently lubricated. In addition, the heating capacity of the radiator also decreases.

In view of the above, an object of the present invention is to provide
An object of the present invention is to provide a refrigeration cycle device capable of supplying a sufficient amount of lubricating oil to a compressor even when an ejector has been operated for a long time.

[0006]

In order to achieve the above object, the technical means described in claims 1 to 5 is adopted.

That is, according to the first aspect of the present invention, the refrigerant compressor (100), the refrigerant radiator (200), and the ejector (4)
00) and a gas-liquid separator (500) for separating the refrigerant into a gas-phase refrigerant and a liquid-phase refrigerant and storing the refrigerant, and a refrigerant flow path (600)
And the liquid-phase refrigerant side of the gas-liquid separator (500) and the suction part of the ejector (400) are connected by a bypass flow path (610), and the refrigerant evaporates in the bypass flow path (610). In the refrigeration cycle apparatus including the intermediary device (300), the gas-liquid separator (500) is connected to the discharge section side of the ejector (400), and is connected to the gas-liquid separator (50).
0), a suction pipe (52) for sucking a gas-liquid mixed refrigerant.
0), a gas-phase refrigerant outlet pipe (530) that opens to the gas-phase part in the gas-liquid separator (500) and discharges the gas-phase refrigerant to the suction side of the refrigerant compressor (100); A liquid-phase refrigerant outlet pipe (540) that opens to the liquid-phase part in (500) and discharges liquid-phase refrigerant to the suction side of the refrigerant evaporator (300), and refrigerant accumulated in the gas-liquid separator (500) And an oil return circuit (510) for returning the lubricating oil separated from the oil to the suction side of the refrigerant compressor (100).

According to the invention of claim 1, the gas-liquid separator (5
Oil return circuit (510) for returning the lubricating oil separated from the refrigerant stored in the refrigerant compressor (00) to the suction side of the refrigerant compressor (100).
Is provided, a sufficient amount of lubricating oil can be supplied to the refrigerant compressor (100) even when the ejector (400) is continuously operated for a long time. It is possible to prevent the refrigerant compressor (100) from seizing due to lack of lubricating oil while preventing a large amount of lubricating oil from accumulating in the compressor.

Here, "separated from the refrigerant" means 10
It does not mean 0% lubricating oil, but rather a mixed fluid containing a large amount of lubricating oil (high lubricating oil concentration) among lubricating oil, refrigerant and mixed fluid.

[0010] Also, the liquid-phase refrigerant which should be originally drawn into the refrigerant evaporator (300) is supplied to the refrigerant compressor (10).
Since it is possible to prevent the refrigerant from being sucked into the 0) side, it is possible to prevent the amount of the liquid-phase refrigerant sucked into the refrigerant evaporator (300) from decreasing. Therefore, the refrigerant evaporator (300)
It is possible to prevent the amount of heat absorbed (refrigeration capacity) from being reduced.

Further, a decrease in the heating capacity of the refrigerant radiator (200) can be prevented with a decrease in the heat absorption.

According to the second aspect of the present invention, the oil return circuit (5
The gas-liquid separator (500) side of 10) is the gas-liquid separator (50).
0), the lubricating oil is connected to a portion where the lubricating oil concentration is higher than the refrigerant concentration.

According to the second aspect of the present invention, a portion where the concentration of the lubricating oil is higher than the refrigerant concentration in the gas-liquid separator (500) differs depending on the liquid densities of the refrigerant and the lubricating oil used in the refrigeration cycle apparatus. Preferably, the oil return circuit (510) is connected to a portion where the concentration of the lubricating oil is high. Thereby, the lubricating oil accumulated in the gas-liquid separator (500) can be returned to the compressor (100) side.

Further, since the refrigerant compressor (100) sucks the lubricating oil from a portion where the concentration of the lubricating oil is high, the suction amount of the liquid-phase refrigerant is small and the possibility of liquid compression is small.

According to the third aspect of the present invention, the liquid-phase refrigerant outlet pipe (540) is opened to the liquid-phase portion in the gas-liquid separator (500), and has a predetermined depth below the opening. An opening (541) is formed in the opening.

According to the third aspect of the present invention, by forming the opening (541) at a position having a predetermined depth dimension below the opening, for example, during the cooling cycle and the heating / cooling cycle, the gas phase is formed. And the liquid phase ratio is different, and even if the liquid level of the liquid phase part fluctuates, the liquid refrigerant of a predetermined depth, that is, the portion of the lubricating oil having a low concentration is reliably discharged to the refrigerant evaporator (300) side. be able to.

In the invention according to claim 4, the gas-phase outlet pipe (53
0) is characterized in that it is disposed above the main body of the gas-liquid separator (500).

According to the invention of claim 4, the gas-liquid separator (5
Since the gas-phase outlet pipe (530) is arranged from the upper side of the refrigerant compressor (00), the gas-phase refrigerant is reliably sucked into the refrigerant compressor (100).

According to the fifth aspect of the present invention, the gas-liquid separator (50)
A collision plate (550) is provided in the gas phase portion in (0) for colliding the refrigerant of the gas-liquid mixture sucked from the suction pipe (520).

According to the invention of claim 5, the collision plate (55)
0), the gas-liquid mixed refrigerant is supplied to the collision plate (5).
By causing the particles to collide with and disperse in 50), separation into a gas phase and a liquid phase can be facilitated.

According to the invention of claim 6, the gas-liquid separator (50)
0) is formed in a substantially cylindrical shape, and has a suction pipe (520) and a gas-phase refrigerant outlet pipe (530) at the upper end, and a liquid-phase refrigerant outlet pipe (540) and an oil return circuit at the lower end. (510) is constituted by a pressure vessel provided therein.

According to the sixth aspect of the present invention, the four pipes and the circuit are disposed at the upper end and the lower end in a substantially cylindrical shape. After joining the pipes and circuits from both sides of the end plate by airtight welding, etc., and then joining the end plate to a substantially cylindrical tube, the work of the airtight process such as welding when manufacturing the pressure vessel is easy. High airtight reliability.

The reference numerals in the parentheses of the above means indicate the correspondence with the concrete means of the embodiment described later.

[0024]

DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) Hereinafter, a refrigeration cycle device incorporating an ejector is applied to a vehicle air conditioner using carbon dioxide as a refrigerant, and will be described with reference to FIGS. 1 to 3. .

First, as shown in FIG. 1, a refrigeration cycle apparatus of the present invention includes a compressor 100 for compressing a gas-phase refrigerant (hereinafter, referred to as a gas refrigerant) by a driving force of a power engine mounted on a vehicle. A refrigerant radiator 200 for condensing and vaporizing the compressed gas refrigerant; and a condensed and vaporized liquid-phase refrigerant (hereinafter, referred to as a refrigerant).
An ejector 400 for decompressing and expanding the liquid refrigerant).
It comprises a gas-liquid separator 500 for gas-liquid separation of the gas-liquid two-phase refrigerant decompressed and expanded, and an evaporator 300 for sucking and vaporizing the gas-liquid separated liquid refrigerant.

The compressor 100 and the refrigerant radiator 20
0, the ejector 400 and the gas-liquid separator 500 are annularly connected by a refrigerant pipe (refrigerant flow path) 600, and the evaporator 300 is connected to the liquid-phase refrigerant outlet pipe 540 of the gas-liquid separator 500 and the suction of the ejector 400. It is installed in the middle of a bypass pipe (bypass flow path) 610 connecting to the section 440, and exhibits a refrigeration capacity by absorbing heat from air blown into the room and evaporating the liquid refrigerant.

Here, the ejector 400 decompresses and expands the refrigerant flowing out of the refrigerant radiator 200 to evaporate the refrigerant.
In addition to sucking the gas refrigerant evaporated in the above, the expansion energy is converted into pressure energy to increase the suction pressure of the compressor 100. Specifically, the refrigerant radiator 20
The nozzle 410 for converting the pressure energy (pressure head) of the high-pressure refrigerant flowing out from the nozzles into velocity energy (speed head) to decompress and expand the refrigerant, and the evaporator 300 by the high-speed refrigerant flow (jet flow) injected from the nozzle 410
And a diffuser 430 for converting the velocity energy into pressure energy to increase the pressure of the refrigerant while mixing the refrigerant injected from the nozzle 410 and the refrigerant sucked from the evaporator 300. (Ejection unit).

Next, 500 shown in FIG. 1 and FIG. 2 indicates that the gas-liquid mixed refrigerant flowing out of the ejector 400 flows in through the suction pipe 520 and separates the flowed refrigerant into gas refrigerant and liquid refrigerant. This is a gas-liquid separator that stores refrigerant.

In the present embodiment, polyglycol (PAG) having a liquid density higher than the liquid density of the refrigerant is used as the lubricating oil.
Since such a mineral oil is used, the gas refrigerant is separated above the gas-liquid separator 500, and the liquid refrigerant is separated from the middle to the lower side. The liquid refrigerant is a mixture of the liquid refrigerant and the lubricating oil. The liquid refrigerant is stored in a layer such that the upper side of the liquid refrigerant has a lower lubricating oil concentration and the lower side has a higher lubricating oil concentration.

Then, the separated gas refrigerant is supplied to the compressor 1 via a gas-phase refrigerant outlet pipe 530 having one end opened at an upper portion of the gas-liquid separator 500 where the gas refrigerant is stored.
00 is sucked into the suction side. One of the liquid refrigerants is disposed so as to be sucked toward the evaporator 300 via a liquid refrigerant outlet pipe 540 having one end opened in a liquid refrigerant region having a relatively low concentration of lubricating oil. .

At the bottom of the gas-liquid separator 500, an oil return pipe (oil return circuit) 510 having one end opened in a region where the lubricating oil has a relatively high concentration is disposed. The other end is connected to the suction side of the compressor 100 so that the lubricating oil separated from the refrigerant in the 500 is returned to the suction side of the compressor 100.

The suction pipe 520 is connected to the gas-liquid separator 50.
The gas-liquid mixed refrigerant flowing into the gas refrigerant 0 is arranged to collide with a collision member 550 formed in a gas refrigerant region in the gas-liquid separator 500. This aims to promote gas-liquid separation.

Further, a refrigerant flow path 610a connecting the gas-liquid separator 500 and the evaporator 300 reduces the pressure of the refrigerant sucked into the evaporator 300 to reliably reduce the pressure in the evaporator 300 (evaporation pressure). For this reason, it is set such that a predetermined pressure loss occurs due to the flow of the refrigerant, like a capillary tube or a fixed throttle.

The gas-liquid separator 500 is required to be airtight because it is a pressure vessel. Therefore, the container body 501
Is formed in a substantially cylindrical shape, and the upper end and the lower end are preferably hermetically sealed by welding or the like. However, the suction pipe 520 and the gas-phase refrigerant outlet pipe 530 provided at the upper end and the lower end, respectively.
And liquid phase refrigerant outlet pipe 540, oil return pipe 510
, 520, 530, 540, 51
It is preferable that the ends of the end plates are joined by welding or the like from both sides of each end plate, and then airtight to the cylindrical container body 501 by welding or the like. Thereby, the work of the airtight process such as welding when manufacturing the pressure vessel is easy, and the reliability of the airtightness is high.

Next, the operation of the refrigeration cycle apparatus having the above configuration will be described with reference to a Mollier diagram (ph diagram) of the refrigerant shown in FIG. Here, the numbers shown in FIG. 3 indicate the state of the refrigerant at the positions of the numbers shown in FIG. Further, in P _H is the high-side pressure of the refrigeration cycle in FIG. 3 (condensing pressure) and P _S in the suction pressure of the compressor 100, the P _E is a low pressure (evaporation pressure).

.DELTA.P is an increase in the suction pressure of the compressor 100, and although its absolute value changes depending on the efficiency in the mixing section 420 of the ejector 400 and the diffuser 430, the refrigerant inlet (6 shown in FIG. 3) of the nozzle 410 and the diffuser The specific enthalpy difference (adiabatic heat drop) at the refrigerant inlet 430 (6 shown in FIG. 3) increases as the difference increases.

First, the gas refrigerant which has been compressed by the compressor 100 to have a high temperature and high pressure (state point 1) is condensed and liquefied by the refrigerant radiator 200 to become a high temperature and high pressure liquid refrigerant (state point 2). 400. Ejector 40
The liquid refrigerant flowing into the nozzle 0 is decompressed when passing through the nozzle 410 to reach the state point 3 and further diffuser 43
When passing through 0, the voltage is boosted to state point 6.

At this time, the gas refrigerant at the state point 8 is connected to the suction portion 440 of the ejector 400 from the bypass pipe 610 by utilizing the pressure drop around the refrigerant ejected at a high speed from the nozzle 410 when the liquid refrigerant passes through the nozzle 410. Is sucked. Therefore, the liquid refrigerant flowing from the refrigerant radiator 200 and the gas refrigerant sucked from the bypass pipe 610 are mixed in the diffuser 430. Thereby, the ejector 4
The refrigerant in the gas-liquid two-phase state flowing out of the state 00 is state point 3,
8 and the refrigerant flow rate from the refrigerant radiator 200 and the evaporator 30
State point 6 is determined by the refrigerant flow rate from zero.

After that, the refrigerant in the gas-liquid two-phase state passes through the refrigerant pipe 600 and flows from the suction pipe 520 to the gas-liquid separator 500.
And separated into a gas refrigerant and a liquid refrigerant. Among them, the gas refrigerant (state point 6 g) flows out of the gas-phase outlet pipe 530 of the gas-liquid separator 500 by the suction force of the compressor 100 and is sucked into the compressor 100 through the refrigerant pipe 600.

The liquid refrigerant (state point 6I) in one gas-liquid separator 500 is sucked by the ejector 400, flows out of the liquid-phase outlet pipe 540 of the gas-liquid separator 500, and flows into the bypass pipe 610. Then, the liquid refrigerant flowing into the bypass pipe 610 flows into the evaporator 300 after being pressurized by the suction effect of the ejector 400 (state point 7). The liquid refrigerant flowing into the evaporator 300 is
After being vaporized and vaporized (state point 8), the liquid is sucked into the suction unit 440 of the ejector 400.

Therefore, even if the ejector 400 is continuously operated for a long time, the lowermost part of the gas-liquid separator 500 stores the high-concentration lubricating oil separated from the refrigerant and disperses the lubricating oil into the oil. From the return pipe 510 to the compressor 100
The suction side of the compressor 10
0 does not mean lubrication oil shortage.

By the way, since the amount of the lubricating oil present in the ejector 400 is constant, the return of a sufficient amount of the lubricating oil to the compressor 100 means that the amount of the lubricating oil remaining in the evaporator 300 does not. Means decrease. This can prevent the heat exchange capacity (refrigeration capacity) of the evaporator 300 from being reduced.

According to the refrigeration cycle apparatus of the first embodiment, in the refrigeration cycle apparatus in which the liquid refrigerant is sucked into the evaporator 300 and evaporated by using the ejector 400, the gas-liquid formed by the ejector 400 By arranging an oil return pipe 510 at the lowest position of the gas-liquid separator 500 that stores the mixed refrigerant by gas-liquid separation and storing the mixed refrigerant, the oil is sucked to the suction side of the compressor 100.
In addition, it is possible to supply sufficient lubricating oil to the evaporator 30 while preventing the seizure and improving the reliability of the ejector 400.
It is possible to prevent the refrigeration capacity generated at 0 from being reduced.

Further, since the lubricating oil sucked into the compressor 100 is sucked from a portion having a high concentration, the suction amount of the liquid refrigerant is small and the possibility of liquid compression is small.

Further, it is possible to prevent the liquid refrigerant that should be drawn into the evaporator 300 from being drawn into the compressor 100. As a result, it is possible to prevent the refrigeration capacity generated in the evaporator 300 from being reduced.

Further, a decrease in the heating capacity of the refrigerant radiator 200 due to a decrease in the refrigeration capacity can be prevented.

(Second Embodiment) In the above embodiment, a liquid-phase refrigerant outlet pipe 540 having an open end is provided in the liquid-phase portion stored in the middle of the gas-liquid separator 500 to provide a gas-liquid separator. The configuration in which the liquid refrigerant in the liquid separator 500 is sucked into the suction side of the evaporator 300 has been described. However, in the gas-liquid separator 500, the pressure and the temperature are different during a cooling cycle, a heating cycle, and the like, so that the liquid level in the liquid phase portion varies. Here, even if the height of the liquid level fluctuates, even if it fluctuates from above the liquid refrigerant to a predetermined depth, the liquid refrigerant is sucked from the upper side (the concentration of lubricating oil is low) below the opening at one end. It is preferable to provide an opening in the opening.

More specifically, as shown in FIG. 4, one end is opened in the liquid phase portion, and the opening 541 is located below the opening at a position separated by a predetermined depth corresponding to the liquid level fluctuation.
Is preferably provided. Accordingly, the liquid refrigerant (low lubricating oil concentration) to the evaporator 300 is supplied to the evaporator 300 even if the liquid level fluctuation in the gas-liquid separator 500 due to the pressure fluctuation of the refrigeration cycle fluctuates by a predetermined depth. Can be sucked reliably.

(Third Embodiment) In the above embodiment, carbon dioxide is used as the refrigerant, and mineral oil such as polyglycol (PAG) having a higher liquid density than the refrigerant is used as the lubricating oil. Although the gas-liquid separator 500 has been described, the present invention is not limited to this.
a), and a lubricant using a mineral oil such as polyglycol (PAG) having a lower liquid density than the refrigerant may be used as the lubricating oil.

As shown in FIG. 5, a gas refrigerant is mixed above the gas-liquid separator 500, and a liquid refrigerant and lubricating oil are mixed from the middle to the lower side, and a lubricating oil is mixed above the liquid surface of the liquid refrigerant. A layer is formed and stored such that the concentration of oil is high and the concentration of lubricating oil is low on the lower side.

Here, the evaporator 3 is connected via a liquid-phase refrigerant outlet pipe 540, one end of which is opened below the gas-liquid separator 500, that is, in a liquid refrigerant region where the lubricating oil has a relatively low concentration.
The lubricating oil is disposed on the suction side of the compressor 100 via an oil return pipe 510 that opens into a region where the lubricating oil has a relatively high concentration. Thereby, the compressor 100 can suck the high-concentration lubricating oil and also can suck the liquid refrigerant in which the low-concentration lubricating oil is mixed into the evaporator 300 side. Therefore, the same effects as those of the first embodiment can be obtained.

By forming the opening 511 below the opening of the oil return pipe 510, even if the oil level fluctuates by a predetermined depth, the compressor 100
High-concentration lubricating oil.

(Fourth Embodiment) In the above embodiment, the gas-liquid mixed refrigerant flowing into the gas-liquid separator 500 is supplied to the collision member 55 formed in the gas refrigerant region in the gas-liquid separator 500.
Although the suction pipe 520 was arranged so as to collide with zero,
Instead of providing the collision member 550, the suction pipe 520 may be provided so as to collide with the inner wall surface in the gas-liquid separator 500.

Specifically, as shown in FIG. 6, the opening of the suction pipe 520 is arranged on the side surface of the gas-liquid separator 500 so as to be inclined so as to generate a swirling flow on the inner wall surface of the gas-liquid separator 500. It is good to set up. Thereby, the sucked refrigerant of the gas-liquid mixture is centrifuged on the inner surface of the gas-liquid separator 500, so that the gas-liquid separation is improved without providing the collision member 550.

(Other Embodiments) In the above embodiments, carbon dioxide or chlorofluorocarbon is used as the refrigerant, but the present invention is not limited to this. For example, hydrocarbons such as ethylene, ethane, nitrogen oxide, and propane Other refrigerants such as a system refrigerant may be used.

The lubricating oil is polyglycol (PA
The material is not limited to minerals such as G), and may be other materials. At this time, the connection position of the oil return pipe 510 needs to be appropriately selected in consideration of the difference between the liquid density of the refrigerant and the liquid density of the lubricating oil.

In the second embodiment, one end is opened in the liquid phase portion, and an opening 541 is formed below the opening at a position separated by a predetermined depth corresponding to the liquid level fluctuation. The liquid-phase refrigerant outlet pipe 540 considers the fluctuation of the liquid level in the liquid part by a predetermined depth. However, the liquid-level fluctuation range is obtained in advance by a test or the like, and the obtained liquid-level fluctuation range is determined. Based on this, the liquid-phase refrigerant outlet pipe 540 may be fixedly arranged without providing the opening 541 so that the liquid-phase refrigerant outlet pipe 540 is located in a predetermined depth range based on the liquid level. Further, as shown in FIG. 7, a liquid-phase refrigerant outlet pipe 540 may be provided on a side surface of the gas-liquid separator 500 to suck the liquid refrigerant.

In the present embodiment, the present invention is applied to a vehicle air conditioner. However, the present invention may be applied to a vehicle cooling device, a vehicle refrigeration device, or a vehicle refrigeration device. Further, the present invention may be applied to a stationary refrigeration device, an air conditioner, a heating device, and a hot water supply device.

Further, in the present embodiment, the compressor 100 is rotationally driven by the power engine for traveling the vehicle, but the compressor 100 is rotationally driven by an auxiliary engine (sub engine) different from the power engine for traveling the vehicle. May be. Also,
The compressor 100 may be rotationally driven by another driving means such as an electric motor.

[Brief description of the drawings]

FIG. 1 is a schematic diagram illustrating an overall configuration of a refrigeration cycle device according to a first embodiment of the present invention.

FIG. 2 is a longitudinal sectional view illustrating a configuration of a gas-liquid separator applied to the refrigeration cycle device according to the first embodiment of the present invention.

FIG. 3 is a Mollier diagram (ph diagram) showing the state of the refrigerant in the refrigeration cycle device according to the first embodiment of the present invention.

FIG. 4 is a longitudinal sectional view illustrating a configuration of a gas-liquid separator according to a second embodiment of the present invention.

FIG. 5 is a longitudinal sectional view illustrating a configuration of a gas-liquid separator according to a third embodiment of the present invention.

FIG. 6 is a plan view illustrating a configuration of a gas-liquid separator according to a fourth embodiment of the present invention.

FIG. 7 is a longitudinal sectional view illustrating a configuration of a gas-liquid separator according to another embodiment.

FIG. 8 is a characteristic diagram showing a relationship between a refrigerating capacity and an oil amount in an evaporator and an elapsed time according to a conventional technique.

[Explanation of symbols]

 Reference Signs List 100 compressor (refrigerant compressor) 200 refrigerant radiator 300 evaporator (refrigerant evaporator) 400 ejector 500 gas-liquid separator 510 oil return pipe (oil return circuit) 520 suction pipe 530 gas phase Refrigerant outlet pipe 540 ... Liquid phase refrigerant outlet pipe 541 ... Opening 550 ... Collision member 600 ... Refrigerant pipe (refrigerant flow path) 610 ... Bypass pipe (Bypass flow path)

Claims (6)

[Claims] A refrigerant compressor (100), a refrigerant radiator (2)
00), an ejector (400) and a gas-liquid separator (50) that separates the refrigerant into a gas-phase refrigerant and a liquid-phase refrigerant and stores the refrigerant.
0) is connected annularly by the refrigerant flow path (600),
The liquid refrigerant side of the gas-liquid separator (500) and the suction part of the ejector (400) are connected by a bypass flow path (610), and a refrigerant evaporator (300) is provided in the middle of the bypass flow path (610). Wherein the gas-liquid separator (500) is provided with the ejector (40).
0) The gas-liquid separator (500) connected to the discharge section side of (0).
Suction pipe (520) for sucking gas-liquid mixed refrigerant into the inside
A gas-phase refrigerant outlet pipe (530) that opens to a gas-phase part in the gas-liquid separator (500) and discharges a gas-phase refrigerant to a suction side of the refrigerant compressor (100); A liquid-phase refrigerant outlet pipe (540) for opening a liquid-phase refrigerant to the suction side of the refrigerant evaporator (300), the liquid-phase refrigerant outlet pipe opening (540) to the liquid-phase part in the vessel (500); An oil return circuit (510) for returning lubricating oil separated from accumulated refrigerant to the suction side of the refrigerant compressor (100). 2. The gas-liquid separator (500) side of the oil return circuit (510) is connected to a portion of the gas-liquid separator (500) where the lubricating oil concentration is higher than the refrigerant concentration. The refrigeration cycle apparatus according to claim 1, wherein: 3. The liquid-phase refrigerant outlet pipe (540) has an opening at a liquid-phase portion in the gas-liquid separator (500), and has an opening at a position having a predetermined depth below the opening. The refrigeration cycle apparatus according to claim 1, wherein a portion (541) is formed. 4. The refrigeration cycle apparatus according to claim 1, wherein the gas-phase refrigerant outlet pipe (530) is disposed above a main body of the gas-liquid separator (500). 5. A collision member (550) for colliding a gas-liquid mixed refrigerant sucked from the suction pipe (520) is provided in a gas phase portion in the gas-liquid separator (500). The refrigeration cycle apparatus according to any one of claims 1 to 4, wherein 6. The gas-liquid separator (500) is formed in a substantially cylindrical shape, and has the suction pipe (520) and the gas-phase refrigerant outlet pipe (530) disposed at an upper end thereof. The refrigeration system according to any one of claims 1 to 5, further comprising a pressure vessel provided with the liquid-phase refrigerant outlet pipe (540) and the oil return circuit (510). Cycle equipment.