JP4966574B2 - Oil separator for refrigerant cycle - Google Patents

Description

  The present invention relates to an oil separator for separating oil from refrigerant discharged from a compressor of a refrigerant cycle device.

  Conventionally, a refrigerant cycle device is configured by connecting a compressor, a radiator, a pressure reducing device, an evaporator, and the like in an annular manner in order. Then, the refrigerant gas compressed by the compressor dissipates heat by the radiator and is depressurized by the decompressor, and then evaporates by exchanging heat with the surroundings by the evaporator. At this time, the refrigerant exerts a cooling action by absorbing heat from the surroundings.

  The compressor that constitutes such a refrigerant cycle is supplied with oil to a sliding portion of the compression element, and performs lubrication and sealing. The oil supplied to the compression element is supplied from the compressor together with the refrigerant. Since the oil is discharged, there has been a problem in that oil outflow into the refrigerant circuit increases.

  In particular, in this type of refrigerant cycle apparatus, in recent years, chlorofluorocarbon refrigerants cannot be used due to global environmental problems. For example, attempts have been made to use carbon dioxide, which is a natural refrigerant. The carbon dioxide refrigerant is a refrigerant with a large pressure difference, and the pressure on the high-pressure side of the refrigerant cycle device becomes very high, so that high viscosity oil is used in consideration of the durability of the sliding part, Since the carbon dioxide refrigerant has a higher refrigerant density than other refrigerants, the flow rate of the refrigerant is slow, so oil pools are more likely to occur than refrigerant cycle devices that use other refrigerants, causing inconveniences that hinder refrigerant circulation. It was. Further, since the oil stopped in the refrigerant circuit does not return to the compressor, the amount of oil in the compressor is insufficient, and the sliding performance and the sealing performance are deteriorated.

  Therefore, conventionally, an oil separator has been provided on the discharge side of the compressor to separate the oil from the discharge gas and return it to the hermetic container without discharging it into the refrigerant circuit. The oil separator is composed of a main body in which a predetermined space for separating oil and refrigerant is formed, and one side surface of the main body has a hole communicating with the space in the main body. The other end of the refrigerant discharge pipe whose one end is connected to the discharge side of the compressor is connected to the hole. The other end of the refrigerant discharge pipe is formed with an opening so that the refrigerant and oil from the refrigerant discharge pipe are discharged along the inner surface at a predetermined distance from the inner surface of the main body.

The refrigerant compressed by the compressor and the oil mixed in the refrigerant gas are discharged from the opening at the other end of the refrigerant discharge pipe along the inner periphery of the main body, and spiraled in the space by the momentum at the time of discharge. In this process, oil mixed in the refrigerant gas is centrifuged from the refrigerant gas, adheres to the inner surface, travels along the inner surface, reaches the lower part of the main body, and returns from there to the hermetically sealed container of the compressor. (For example, refer to Patent Document 1).
JP 2004-308968 A

  By the way, in the conventional oil separator, the refrigerant discharge pipe from which the refrigerant gas and oil compressed by the compressor are discharged is such that the opening at the other end is located at a predetermined distance from the inner surface of the main body as described above. In view of the workability at the time of assembly, it is necessary to form a positioning portion on the outer periphery of the refrigerant discharge pipe, which increases the manufacturing cost accordingly.

  In particular, when carbon dioxide refrigerant is used as the refrigerant, the main body of the oil separator and the refrigerant piping connected to the main body should be formed thick so as to withstand the high pressure of the carbon dioxide refrigerant. Therefore, there has been a problem that the manufacturing cost of the oil separator is remarkably increased.

  The present invention has been made to solve the conventional technical problems, and an object of the present invention is to inexpensively manufacture an oil separator for a refrigerant cycle having excellent oil separation performance.

The oil separator for the refrigerant cycle of the present invention is for separating oil from the refrigerant discharged from the compressor constituting the refrigerant cycle, has a substantially cylindrical shape, and an oil outlet is formed in the lower part. A main body in which a refrigerant outlet is formed above the outlet, and a refrigerant introduction pipe that is inserted into the main body and that has a tip opened in the main body, the tip of the refrigerant introduction pipe is cut obliquely, and the tip portion Is abutted against the inner surface of the main body, and the opening of the cut refrigerant introduction pipe opens in the circumferential direction of the inner surface of the main body and has a shape separated from the inner surface of the main body. .

The oil separator for a refrigerant cycle of the invention of claim 2 is characterized in that, in the above invention , the refrigerant cycle uses carbon dioxide as a refrigerant.

According to the oil separator for a refrigerant cycle of the present invention, it has a substantially cylindrical shape , an oil outlet is formed in the lower portion, a main body in which a refrigerant outlet is formed above the oil outlet, and the tip of the main body is inserted into the main body. A refrigerant introduction pipe that opens in the main body, the tip of the refrigerant introduction pipe is cut obliquely, and the front end is abutted against the inner surface of the main body, and the opening of the cut refrigerant introduction pipe is the faces in the circumferential direction of the inner surface and opening, since a shape away from the inner surface of the body, the refrigerant introducing pipe just abuts against the front end portion on the inner surface of the main body by inserting the refrigerant introducing pipe into the body Positioning can be performed.

In particular, since the opening at the tip of the refrigerant introduction tube has a shape that is separated from the inner surface of the main body from the tip portion , even if the tip of the refrigerant introduction tube is in contact with the inner surface of the main body, The refrigerant containing can be allowed to flow into the main body without hindrance.

  As a result, it is possible to allow the refrigerant containing oil to flow into the main body without any trouble without forming a conventional positioning portion, so that the oil separator for the refrigerant cycle is inexpensive while maintaining good oil separation performance. Can be manufactured.

In addition, since the tip of the refrigerant introduction pipe is cut obliquely, the component cost of the refrigerant introduction pipe can be reduced.

Further, the main body has a substantially cylindrical shape, and the opening of the cut refrigerant introduction pipe is opened in the circumferential direction of the inner surface of the main body, so that the refrigerant discharged from the refrigerant introduction pipe is on the inner surface. Since a vortex swirling along the circumferential shape is created, oil separation can be performed smoothly by centrifugal force.

In particular, by applying the present invention to a refrigerant cycle using carbon dioxide as a refrigerant as in claim 2, it is possible to suppress as much as possible an increase in manufacturing cost due to the use of carbon dioxide refrigerant.

  The present invention aims to produce an oil separator for a refrigerant cycle with good separation performance at low cost, and in particular, suppresses the production cost of an oil separator that can be used in a refrigerant cycle that uses carbon dioxide as a refrigerant. It was made for that purpose. The object of reducing the manufacturing cost of the oil separator for the refrigerant cycle was realized by cutting a part of the tip of the refrigerant introduction pipe inserted into the main body into a shape separated from the inner surface of the main body. Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows a refrigerant circuit diagram of a refrigerant cycle device of an embodiment provided with an oil separator for refrigerant cycle of the present invention. A refrigerant cycle device 1 in FIG. 1 is configured by connecting a compressor (compressor) 10, an oil separator 2 of the present invention, a radiator 154, an expansion valve 156 as a decompression device, an evaporator 157, and the like in an annular manner in order. A cycle is configured. Carbon dioxide is used as a refrigerant in the refrigerant cycle. The compressor 10 of the embodiment includes an electric element 14 as a driving element in a sealed container 12, a first rotary compression element 32 and a second rotary compression element 34 that are driven by a rotary shaft 16 of the electric element 14. Is an internal intermediate pressure type multi-stage (two-stage) compression rotary compressor. Then, the refrigerant (CO ₂ ) sucked from the refrigerant introduction pipe 94 is compressed by the first rotary compression element 32, and after the compressed intermediate pressure refrigerant gas is discharged into the sealed container, the refrigerant is introduced through the refrigerant introduction pipe 92. The second rotary compression element 34 is sucked and compressed and discharged to the refrigerant pipe 96.

  The refrigerant introduction pipe 94 is a refrigerant pipe for introducing refrigerant into the first rotary compression element 32 of the compressor, and one end of the refrigerant introduction pipe 94 is connected to the suction side of the first rotary compression element 32; The other end is connected to the outlet of the evaporator 157.

  The refrigerant pipe 96 is a refrigerant introduction pipe for introducing the refrigerant compressed by the second rotary compression element 34 into the main body 3 of the oil separator 2 as an oil separator for a refrigerant cycle to be described later. Is connected to the discharge side of the second rotary compression element 34, and the other end (tip) is opened in the main body 3 of the oil separator 2.

  The refrigerant introduction pipe 92 is a refrigerant pipe connecting the inside of the sealed container 12 and the suction side of the second rotary compression element 34. The refrigerant introduction pipe 92 passes through the outside of the compressor 10 and then passes through the second The rotary compression element 34 is disposed so as to be connected to the suction side. That is, the intermediate-pressure refrigerant compressed by the first rotary compression element 32 of the compressor 10 and discharged into the sealed container 12 flows into the refrigerant introduction pipe 92 and passes through the outside of the compressor 10, and then the second It is assumed that the rotary compression element 34 is sucked.

  An oil sump is formed at the inner bottom of the sealed container 12 of the compressor 10, and the oil stored in the oil sump is first and second by an oil pump (not shown) attached to the lower end of the rotating shaft 16. 2 is supplied to the sliding portions of the rotary compression elements 32 and 34 to perform lubrication and sealing. Further, the other end of the oil pipe 5 is connected to the side surface of the sealed container 12 and opens in the sealed container 12. The oil pipe 5 is a pipe for returning the oil separated by the oil separator 2 to an oil sump formed at the bottom of the sealed container 12. One end of the oil pipe 5 is connected to an oil outlet 3 </ b> B at the bottom of the oil separator 2, and opens in the main body 3.

  In this embodiment, since carbon dioxide having a large difference in high and low pressure is used as the refrigerant, oil having higher viscosity than oil used in the conventional HFC refrigerant is used in consideration of durability. For example, in this embodiment, PAG (polyalkyl glycol) having a viscosity of + 60 ° C. or more at + 40 ° C. is used. In addition, the oil used for the refrigerant cycle apparatus 1 of the embodiment is not limited to the PAG, and may be other high viscosity oil. The high-viscosity oil used here has a pour point of −40 ° C. or higher and a viscosity of 40 to 120 cst at + 40 ° C., preferably an oil having a viscosity of 60 to 80 cst at + 40 ° C. I will use it.

  On the other hand, the refrigerant pipe 97 connected to the refrigerant outlet 3A of the oil separator 2 is connected to the inlet of the radiator 154, and the outlet of the radiator 154 is connected to the refrigerant pipe leading to the expansion valve 156 as a decompression device. In the refrigerant cycle device 1 of the present embodiment, an expansion valve is used as the pressure reducing device. However, any other device can be used as long as it can depressurize the refrigerant, such as a capillary tube. It doesn't matter.

  The outlet of the expansion valve 156 is connected to a pipe reaching the inlet of the evaporator 157, and the outlet of the evaporator 157 is connected to the refrigerant introduction pipe 94.

  Here, the oil separator 2 will be described with reference to a longitudinal sectional view of the oil separator 2 shown in FIG. 2 and a plan sectional view of the oil separator 2 shown in FIG. The oil separator 2 is formed on one side of the main body 3, a main body 3 having a vertically long cylindrical shape, an oil outlet 3 </ b> B formed at a lower portion of the main body 3, a refrigerant outlet 3 </ b> A formed above the oil outlet 3 </ b> B. And a hole 4 penetrating through the inside and outside of the main body 3. In this embodiment, the oil outlet 3 </ b> B is formed at the bottom of the main body 3, and the refrigerant outlet 3 </ b> A is formed at the top of the main body 3. Therefore, the hole 4 is located between the oil outlet 3B and the refrigerant outlet 3B. A refrigerant pipe 97 reaching the inlet of the radiator 154 is connected to the refrigerant outlet 3 </ b> A, and one end of the refrigerant pipe 97 is opened at an upper portion in the main body 3. In addition, one end of the oil pipe 5 communicating with the inside of the closed container 12 of the compressor 10 is connected to the oil outlet 3B.

  On the other hand, the refrigerant for discharging refrigerant gas and oil (refrigerant gas containing oil) compressed by the second rotary compression element 34 of the compressor 10 into the hole 4 formed on one side surface of the main body 3. A pipe 96 is inserted. The refrigerant pipe 96 has its tip (other end) cut obliquely. Specifically, the tip of the refrigerant pipe 96 is cut at an angle of 30 ° to 60 °, preferably 45 ° with respect to the direction in which the refrigerant pipe 96 extends starting from the tip portion 96A. As a result, an opening 96B that opens obliquely at an angle of 45 ° from the tip 96A is formed at the tip (the other end) of the refrigerant pipe 96.

  Here, a procedure for mounting the refrigerant pipe 96 in the main body 3 will be described. First, the opening 96B formed at the front end of the refrigerant pipe 96 is prepared so as to face the circumferential direction (horizontal direction) of the inner surface of the main body 3, and in this state, the front end extends from the hole 4 in the horizontal direction (from the right side in FIG. 3). To the left). As soon as it is inserted, the leading end 96A of the refrigerant pipe 96 abuts against the inner surface 6 (the inner surface opposite to the side where the holes 4 are formed) of the main body 3 facing each other. At this stage, the refrigerant pipe 96 can no longer be inserted, and the position of the refrigerant pipe 96 relative to the main body 3 is determined. In this state, the main body 3 around the hole 4 and the refrigerant pipe 96 are fixed by welding, and the gap between the two is sealed.

  In this state, the tip 96A of the refrigerant pipe 96 is in contact with the inner surface 6 of the main body 3 and the refrigerant pipe 96 is fixed to the main body 3, and the opening 96B is formed on the inner surface 6 of the main body 3 as shown in FIGS. Are opened in the main body 3 in a state of being directed in the circumferential direction. That is, in the embodiment, the tip end of the refrigerant pipe 96 is cut obliquely, so that the opening 96B is sufficiently larger than the inner face 6 of the main body 3 even when the front end portion 96A of the refrigerant pipe 96 abuts against the inner face 6 of the main body 3. It will be in the state spaced apart. As a result, the refrigerant containing oil that has flowed into the refrigerant pipe 96 can flow into the main body 3 from the opening 96B without any problem. Moreover, since the opening part 96B is opened toward the circumferential direction of the inner surface 6 in the main body 3, the refrigerant swirls along the inner surface so as to form a vortex.

  As described above, when the refrigerant pipe 96 is attached to the main body 3 by obliquely cutting the front end of the refrigerant pipe 96 inserted into the main body 3, the front end portion 96 </ b> A of the refrigerant pipe 96 is pushed into the inner surface 6 of the main body 3. It is possible to position the refrigerant pipe 96 simply by hitting it. Further, as described above, simply by inserting the refrigerant pipe 96, the opening 96B is separated from the inner surface 6 of the main body 3 and opens in the circumferential direction, so that oil is contained from the tip of the refrigerant pipe 96. The refrigerant can be allowed to flow into the main body 3 without hindrance.

  Next, the operation of the refrigerant cycle device 1 of the present invention will be described with the above configuration. When the electric element 14 of the compressor 10 is energized from a control device (not shown), the electric element 14 is activated. As a result, the low-temperature and low-pressure refrigerant gas is sucked into the first rotary compression element 32 of the compressor 10 and compressed, becomes an intermediate pressure, and is discharged into the sealed container 12. The intermediate-pressure refrigerant gas discharged into the hermetic container 12 enters the refrigerant introduction pipe 92, passes through the outside of the compressor 10, returns to the compressor 10, and is sucked into the second rotary compression element 34.

  Then, the second stage compression is performed by the second rotary compression element 34 to form a high-temperature and high-pressure refrigerant gas, which is discharged from the refrigerant pipe 96 to the outside of the compressor 10. At this time, as will be described later, oil supplied to the sliding portion of the second rotary compression element 34 is also discharged together with the refrigerant gas. Refrigerant gas and oil (refrigerant gas including oil) discharged from the compressor 10 are discharged from the refrigerant pipe 96 into the main body 3 of the oil separator 2. At this time, the refrigerant gas and the oil mixed in the refrigerant gas have a circumferential shape on the inner surface as shown by an arrow in FIG. 3 from the opening 96B of the refrigerant pipe 96 opened in the circumferential direction of the inner surface of the main body 3. The discharged refrigerant gas and oil swirl in the main body 3 so as to form a vortex along the inner surface by the momentum at the time of discharge.

  In this process, the oil mixed in the refrigerant gas is centrifuged from the refrigerant gas, adheres to the inner surface of the main body 3, travels along the inner surface, reaches the oil outlet 3B formed at the bottom, and is connected to the oil outlet 3B. The oil pipe 5 is returned to the lower oil sump in the sealed container 12 (broken arrow in FIG. 1).

  On the other hand, the refrigerant separated from the oil in the main body 3 of the oil separator 2 is connected to a refrigerant outlet 3A formed at the upper end of the main body 3 and exits the oil separator 2 from a refrigerant pipe 97 opened at the upper portion in the main body 3. Flows into the radiator 154. Therefore, the refrigerant gas radiates heat by the air cooling method by the fan 111, then exits the radiator 154 and passes through the expansion valve 156.

  The refrigerant gas is depressurized in the process of passing through the expansion valve 156 and then flows into the evaporator 157. The refrigerant that has flowed into the evaporator 157 evaporates in the course of flowing through the evaporator 157 and exhibits a cooling action by absorbing heat from the air. The refrigerant evaporated by exchanging heat with air in the evaporator 157 exits the evaporator 157 and enters the refrigerant introduction pipe 94, and the cycle of being sucked into the first rotary compression element 32 of the compressor 10 is repeated.

  Here, oil is supplied to the sliding portions of the first and second rotary compression elements 32 and 34 of the compressor 10, and the oil supplied to the rotary compression elements 32 and 34 in relation to lubrication and sealing. Is compressed together with the refrigerant and discharged to the outside of the compressor 10. If this oil is left discharged to the outside of the compressor 10, the oil stops in the refrigerant circuit, and in particular, the radiator 154 and the evaporator 157. Thus, the oil easily collects in the refrigerant passage of the heat exchanger.

  As described above, when oil accumulates in the refrigerant circuit, the oil causes a problem that the refrigerant circulation is hindered. Further, since the oil that has stopped in the refrigerant circuit does not return to the compressor 10, the amount of oil in the compressor 10 is insufficient, leading to deterioration in sliding performance and sealing performance. In particular, when carbon dioxide is used as a refrigerant, the carbon dioxide is a refrigerant with a large difference in high and low pressure, and in consideration of durability, high viscosity oil is used, and the carbon dioxide refrigerant is another refrigerant. Since the refrigerant density is higher than that of the refrigerant, the flow rate of the refrigerant is slow, so that oil accumulation is more likely to occur than refrigerant cycle devices using other refrigerants, and the problem of hindering refrigerant circulation has been serious.

  However, by providing the oil separator 2 on the discharge side of the compressor 10, the oil mixed in the refrigerant gas compressed by the second rotary compression element 34 is centrifuged by the oil separator 2, so that the refrigerant gas enters the refrigerant gas. The mixed oil can be effectively separated.

  As a result, the amount of oil discharged from the compressor 10 into the refrigerant circuit can be significantly reduced. In particular, the problem of oil collecting in the refrigerant passages of the heat exchangers such as the radiator 153 and the evaporator 157 can be eliminated, so that the disadvantage that the compressor 10 is short of oil and the adverse effect on the refrigerant circuit can be avoided. Will be able to.

  Furthermore, in the conventional oil separator 102, the tip 196A of the refrigerant pipe 196 from which the refrigerant gas and oil compressed by the compressor 10 are discharged has an ordinary shape, that is, the main body 3 as shown in FIGS. In order to discharge the refrigerant containing oil into the main body 3 from the opening 196B formed in the front end portion 196A, the front end portion 196A and the inner surface of the main body 3 are not cut. 6 had to be attached so as to be in a state with a predetermined interval. In this case, the positioning portion 198 is formed on the outer periphery of the refrigerant pipe 196 in view of workability at the time of assembly. The positioning portion 198 is a protrusion formed in a convex shape on the outer peripheral edge of the refrigerant pipe 97.

  And in order to attach the refrigerant | coolant piping 196 in the main body 3, the refrigerant | coolant piping 196 is inserted in the hole 4 in the horizontal direction from the front-end | tip. As the plug is inserted, the positioning portion 198 of the refrigerant pipe 196 and the outer peripheral edge of the main body 3 come into contact with each other, and no longer can be inserted, and the position of the refrigerant pipe 196 with respect to the main body 3 is determined. In this state, the main body 3 around the hole 4 and the refrigerant pipe 196 are fixed by welding, and the gap between the two is sealed. As described above, the conventional oil separator 102 is positioned by the positioning portion 198 in a state where the front end portion 196A of the refrigerant pipe 196 is spaced from the inner surface 6 of the main body 3 by a predetermined distance. Thereby, the refrigerant containing oil flows into the main body 3 without any trouble from the opening 196B of the tip 196A.

  However, by forming the positioning portion 198 on the outer periphery of the refrigerant pipe 196 as in the conventional configuration described above, there is a disadvantage that the manufacturing cost increases accordingly. In particular, when carbon dioxide is used as the refrigerant as in the present embodiment, the pressure on the discharge side of the compressor 10 becomes very high, so that the main body of the oil separator, the refrigerant pipe connected to the main body, and the like are thickened. Since it must be formed and manufactured so as to be able to withstand the high pressure of the carbon oxide refrigerant, there has been a problem that the manufacturing cost further increases.

  On the other hand, in the present invention, a part of the tip of the refrigerant pipe 96 is cut into a shape that is separated from the inner surface 6 of the main body 3. The refrigerant pipe 96 can be positioned simply by abutting against the inner surface of 3.

  Particularly, since a part of the tip of the refrigerant pipe 96 is cut away from the inner surface 6 of the main body 3, even if the tip of the refrigerant pipe 96 is in contact with the inner surface 6 of the main body 3, The refrigerant containing oil can be allowed to flow into the main body 3 without hindrance.

  Accordingly, it is possible to allow the oil-containing refrigerant to flow into the main body 3 without any trouble without forming the conventional positioning portion 198. Therefore, while maintaining good oil separation performance, the refrigerant separator for the refrigerant cycle 2 can be manufactured at low cost.

  In particular, in the present embodiment, since the tip of the refrigerant pipe 96 is simply cut obliquely, the component cost of the refrigerant pipe 96 can be reduced. Furthermore, since the opening 96B formed at the tip of the refrigerant pipe 96 is open in the circumferential direction of the inner surface of the main body 3 as described above, the refrigerant discharged from the refrigerant pipe 96 is circumferential on the inner surface. A vortex swirling along the shape is created. Thereby, oil separation can be smoothly performed by centrifugal force.

  Furthermore, by applying the oil separator 2 of the present invention to the refrigerant cycle using the carbon dioxide refrigerant as in this embodiment, it is possible to suppress an increase in the manufacturing cost of the oil separator 2 due to the use of the carbon dioxide refrigerant. Become.

  As described above in detail, according to the present invention, the oil separator 2 for a refrigerant cycle device having excellent oil separation performance can be manufactured at low cost.

  In the present embodiment, the tip of the refrigerant pipe 96 is cut obliquely. However, the invention of claim 1, claim 3 or claim 4 is not limited to this, and a part of the tip is simply placed on the main body 3. For example, as shown in FIG. 4, it may be cut away from the inner surface 6 of the main body 3 by cutting away a part of the tip as shown in FIG. As shown, both sides of the tip may be cut into a concave shape so as to be separated from the inner surface 6 of the main body 3. In FIGS. 4 and 5, 96A is a front end portion of the refrigerant pipe 96, and 96B is an opening portion 96B formed by cutting a part of the front end. Also in this case, as in the above embodiment, since the openings are opened from the respective openings 96B in the circumferential direction, the refrigerant discharged from the refrigerant pipe 96 creates a swirl that swirls along the circumferential shape of the inner surface. Become. Thereby, oil separation can be smoothly performed by centrifugal force.

  In this embodiment, the oil separated by the oil separator 2 is returned from the oil pipe 5 into the sealed container 12, but the oil may be returned to the suction side of the first rotary compression element 32. Absent.

  Further, in this embodiment, carbon dioxide refrigerant is used in the refrigerant cycle device provided with the oil separator 2, but the inventions of claims 1 and 3 are not limited to this, and other refrigerants are used. It is also effective for the refrigerant cycle using

It is a refrigerant circuit figure of the refrigerant cycle device of the example provided with the oil separator for refrigerant cycles of the present invention. It is a longitudinal cross-sectional view of the oil separator for refrigerant | coolant cycles of one Example to which this invention is applied. FIG. 3 is a cross-sectional plan view of the refrigerant separator for the refrigerant cycle of FIG. 2. It is a plane sectional view of the oil separator for refrigerant cycles of other examples to which the present invention is applied. It is a plane sectional view of the oil separator for refrigerant cycles of another other example to which the present invention is applied. It is a longitudinal cross-sectional view of the conventional oil separator for refrigerant cycles. It is a plane sectional view of the oil separator for refrigerant cycles of Drawing 6.

DESCRIPTION OF SYMBOLS 1 Refrigerant cycle device 2 Oil separator 3 Main body 3A Refrigerant outlet 3B Oil outlet 4 Hole 5 Oil piping 6 Inner surface (the inner surface on the opposite side to the hole-formed side)
DESCRIPTION OF SYMBOLS 10 Compressor 12 Airtight container 14 Electric element 32 1st rotation compression element 34 2nd rotation compression element 92, 94 Refrigerant introduction pipe 96, 97 Refrigerant piping 96A Tip part 96B Opening part 154 Radiator 156 Expansion valve 157 Evaporator

Claims (2)

An oil separator for separating oil from refrigerant discharged from a compressor constituting a refrigerant cycle,
A main body having a substantially cylindrical shape , an oil outlet formed at the lower part, and a refrigerant outlet formed above the oil outlet;
A refrigerant introduction pipe that is inserted into the main body and whose tip opens in the main body;
The front end of the refrigerant introduction pipe is cut obliquely, and the front end of the refrigerant introduction pipe is abutted against the inner surface of the main body, and the cut opening of the refrigerant introduction pipe opens toward the circumferential direction of the inner surface of the main body. And the oil separator for refrigerant | coolant cycles characterized by exhibiting the shape spaced apart from the inner surface of the said main body. The oil separator for a refrigerant cycle according to claim 1, wherein the refrigerant cycle uses carbon dioxide as a refrigerant.

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