WO2018146991A1

WO2018146991A1 - Compressor

Info

Publication number: WO2018146991A1
Application number: PCT/JP2018/000583
Authority: WO
Inventors: 芳夫小和田
Original assignee: サンデンホールディングス株式会社
Priority date: 2017-02-07
Filing date: 2018-01-12
Publication date: 2018-08-16
Also published as: CN110312868A; US20200003199A1; JP2018127933A; DE112018000719T5

Abstract

[Problem] To prevent a control failure, a lubrication failure, etc., which are caused by contamination. [Solution] An oil separator 230 provided to a compressor has: a separation section for separating lubricating oil OIL from an operating fluid utilizing a centrifugal force; and an accumulation section located below the separation section and accumulating the lubricating oil OIL having been separated by the separation section. A hat-shaped collection member 260 is provided between the separation section and the accumulation section. The collection member 260 temporarily accumulates the lubricating oil OIL, which has been separated by the separation section, and discharges the supernatant of the lubricating oil OIL into the accumulation section. The collection member 260 allows a contamination CON mixed in the lubricating oil OIL to settle and collects the contamination CON.

Description

Compressor

The present invention relates to a compressor that compresses a working fluid such as a refrigerant.

In a compressor, when mist of lubricating oil is mixed into a gaseous refrigerant (gas refrigerant) compressed by a compression mechanism, it may be introduced into a condenser of a refrigerant circuit and the efficiency thereof may be reduced. For this reason, the compressor is provided with an oil separator that separates the lubricating oil from the gaseous refrigerant discharged from the compression mechanism. The lubricating oil separated by the oil separator is used as a back pressure that presses the orbiting scroll against the fixed scroll in a scroll compressor, for example. In order to adjust the back pressure, a back pressure control valve that operates according to a differential pressure between the suction pressure and the discharge pressure is used.

Incidentally, contamination (foreign matter) such as sludge is mixed in the lubricating oil of the compressor. When contamination is introduced into the back pressure control valve, for example, the valve body cannot move smoothly, and the back pressure cannot be adjusted appropriately. For this reason, as described in Japanese Patent Application Laid-Open No. 2003-343433 (Patent Document 1), by attaching a filter to the back pressure control valve, contamination is captured and occurrence of malfunction is suppressed.

JP 2003-343433 A

However, since the filter of the back pressure control valve has a small contamination capturing area, if the compressor is used for many years, the entire surface of the filter is covered with the contamination and the lubricating oil does not flow. There is a risk of poor lubrication of moving parts. Note that a problem due to contamination mixed in the lubricating oil may occur not only in the back pressure control valve but also in an orifice disposed in the lubricating oil flow path.

Therefore, an object of the present invention is to provide a compressor capable of suppressing control failure and lubrication failure due to contamination.

For this reason, the compressor has an oil separator having a separation part that separates the lubricating oil from the working fluid using centrifugal force, and a storage part that is located below the separation part and stores the lubricating oil separated by the separation part And comprising. And the capture member which stores the lubricating oil isolate | separated by the separation part temporarily, and discharge | emits the supernatant to a storage part is arrange | positioned between the separation part and the storage part.

According to the present invention, it is possible to suppress control failure and lubrication failure due to contamination.

It is sectional drawing which shows an example of a scroll compressor. It is explanatory drawing of the separation method of the lubricating oil by an oil separator. It is a block diagram explaining the flow of a refrigerant and lubricating oil. It is a longitudinal cross-sectional view which shows 1st Embodiment of a capture member. It is a longitudinal cross-sectional view which shows the principal part of the modification of the capture member which concerns on 1st Embodiment. It is a longitudinal cross-sectional view which shows 2nd Embodiment of a capture member. It is a longitudinal cross-sectional view which shows 3rd Embodiment of a capture member. It is a longitudinal cross-sectional view which shows the principal part of the modification of the capture member which concerns on 3rd Embodiment.

Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 shows an example of a scroll compressor. A scroll compressor is an example of a compressor.

The scroll compressor 100 includes a scroll unit 120, a housing 140 having a gas refrigerant suction chamber H1 and a discharge chamber H2, an electric motor 160 that drives the scroll unit 120, and an inverter 180 that controls the electric motor 160. ing. The scroll unit 120 may be driven by, for example, engine output instead of the electric motor 160. Further, the inverter 180 may not be incorporated in the scroll compressor 100.

The scroll unit 120 has a fixed scroll 122 and a turning scroll 124 that are meshed with each other. The fixed scroll 122 includes a disc-shaped bottom plate 122A and an involute-shaped (spiral shape) wrap 122B standing from one surface of the bottom plate 122A. Similar to the fixed scroll 122, the orbiting scroll 124 includes a disc-shaped bottom plate 124A and an involute-shaped wrap 124B standing from one surface of the bottom plate 124A.

The fixed scroll 122 and the orbiting scroll 124 are arranged so as to mesh the

wraps

122B and 124B. Specifically, the front end portion of the wrap 122B of the fixed scroll 122 is in contact with one surface of the bottom plate 124A of the orbiting scroll 124, and the front end portion of the wrap 124B of the orbiting scroll 124 is in contact with one surface of the bottom plate 122A of the fixed scroll 122. Is arranged. A tip seal (not shown) is attached to the tip of the

wraps

122B and 124B.

Further, the fixed scroll 122 and the orbiting scroll 124 are arranged so that the side walls of the

wraps

122B and 124B are partially in contact with each other in a state where the circumferential angles of the

wraps

122B and 124B are shifted from each other. Therefore, a crescent-shaped sealed space that functions as the compression chamber H3 is formed between the wrap 122B of the fixed scroll 122 and the wrap 124B of the orbiting scroll 124.

The orbiting scroll 124 is disposed so as to be able to revolve around the axis of the fixed scroll 122 via a crank mechanism 240 described later in a state where the rotation is prevented. Therefore, the scroll unit 120 moves the compression chamber H3 defined by the wrap 122B of the fixed scroll 122 and the wrap 124B of the orbiting scroll 124 to the center, and gradually reduces the volume thereof. As a result, the scroll unit 120 compresses the gaseous refrigerant sucked into the compression chamber H3 from the outer ends of the

wraps

122B and 124B.

The housing 140 includes a front housing 142 that houses the electric motor 160 and the inverter 180, a center housing 144 that houses the scroll unit 120, a rear housing 146, and an inverter cover 148. The front housing 142, the center housing 144, the rear housing 146, and the inverter cover 148 are integrally fastened by, for example, a fastener (not shown) including a bolt and a washer, so that the housing of the scroll compressor 100 is obtained. 140 is configured.

The front housing 142 has a substantially cylindrical peripheral wall 142A and a partition wall 142B. The internal space of the front housing 142 is partitioned into a space for housing the electric motor 160 and a space for housing the inverter 180 by the partition wall 142B. The opening on one end side of the peripheral wall portion 142 A is closed by the inverter cover 148. Further, the opening on the other end side of the peripheral wall portion 142 A is closed by the center housing 144. The partition wall 142B has a substantially cylindrical support 142B1 that rotatably supports one end of a drive shaft 166, which will be described later, at the center in the radial direction, and protrudes toward the other end of the peripheral wall 142A. Has been.

Further, the suction chamber H1 for the gaseous refrigerant is partitioned by the peripheral wall 142A and the partition wall 142B of the front housing 142 and the center housing 144. Low-pressure and low-temperature gaseous refrigerant is sucked into the suction chamber H1 through a suction port P1 formed in the peripheral wall 142A. In the suction chamber H1, gas refrigerant flows around the electric motor 160 so that the electric motor 160 can be cooled, and the space on one side of the electric motor 160 communicates with the space on the other side. A suction chamber H1 is formed. An appropriate amount of lubricating oil is stored in the suction chamber H1 in order to lubricate sliding portions such as the drive shaft 166 that is rotationally driven. For this reason, in the suction chamber H1, the gaseous refrigerant flows as a mixed fluid with the lubricating oil.

The center housing 144 has a substantially bottomed cylindrical shape that is open on the side opposite to the fastening side with the front housing 142, and can accommodate the scroll unit 120 therein. The center housing 144 has a cylindrical portion 144A and a bottom wall portion 144B on one end side thereof. The scroll unit 120 is accommodated in a space defined by the cylindrical portion 144A and the bottom wall portion 144B. A fitting portion 144A1 into which the fixed scroll 122 is fitted is formed on the other end side of the cylindrical portion 144A. Therefore, the opening of the center housing 144 is closed by the fixed scroll 122. Further, the bottom wall portion 144 B is formed so that a central portion in the radial direction bulges toward the electric motor 160. A through hole for allowing the other end portion of the drive shaft 166 to penetrate is formed in the radial center portion of the bulging portion 144B1 of the bottom wall portion 144B. And the fitting part which the bearing 200 which supports the other end part of the drive shaft 166 freely rotatably is formed in the scroll unit 120 side of the bulging part 144B1.

An annular thrust plate 210 is disposed between the bottom wall portion 144B of the center housing 144 and the bottom plate 124A of the orbiting scroll 124. The outer peripheral portion of the bottom wall portion 144 B receives a thrust force from the orbiting scroll 124 via the thrust plate 210. Sealing members (not shown) are embedded in the bottom wall portion 144B and the portions of the bottom plate 124A that are in contact with the thrust plate 210, respectively.

Further, a back pressure chamber H4 is formed between the end surface of the bottom plate 124A on the electric motor 160 side and the bottom wall portion 144B, that is, between the end surface of the orbiting scroll 124 opposite to the fixed scroll 122 and the center housing 144. Has been. A gas refrigerant (specifically, a mixed fluid of a gas refrigerant and lubricating oil) is introduced into the center housing 144 from the suction chamber H1 to the space H5 near the outer ends of the

wraps

122B and 124B of the scroll unit 120. A refrigerant introduction passage L1 is formed. Since the refrigerant introduction passage L1 communicates the space H5 and the suction chamber H1, the pressure of the space H5 is equal to the pressure of the suction chamber H1 (suction pressure Ps).

The rear housing 146 is fastened to a fitting portion 144A1 side end portion of the cylindrical portion 144A of the center housing 144 by a fastener. Accordingly, the bottom plate 122A of the fixed scroll 122 is fixed by being sandwiched between the fitting portion 144A1 and the rear housing 146. Further, the rear housing 146 has a substantially bottomed cylindrical shape with an opening on the fastening side (one end side) with the center housing 144, and has a cylindrical portion 146A and a bottom wall portion 146B on the other end side.

A gas refrigerant discharge chamber H2 is defined by the cylindrical portion 146A and the bottom wall portion 146B of the rear housing 146 and the bottom plate 122A of the fixed scroll 122. A compressed refrigerant discharge passage (discharge hole) L2 is formed at the center of the bottom plate 122A, and the discharge passage L2 restricts the flow from the discharge chamber H2 to the scroll unit 120, for example, a check valve comprising a reed valve. A valve 220 is attached. Compressed refrigerant compressed in the compression chamber H3 of the scroll unit 120 is discharged into the discharge chamber H2 through the discharge passage L2 and the check valve 220.

In the rear housing 146, an oil separator 230 for separating the lubricating oil from the gaseous refrigerant in the discharge chamber H2 is disposed. Specifically, the rear end portion of the rear housing 146, that is, the end portion on the side opposite to the center housing 144, has a gas-liquid separation chamber having a circular cross section extending from the outer peripheral wall to the inside. 230A is formed. A stepped inner cylinder 230B having a circular cross section is inserted into the gas-liquid separation chamber 230A so as to be concentric with the gas-liquid separation chamber 230A. The base end portion of the inner cylinder 230B is locked to the step portion 230A1 of the gas-liquid separation chamber 230A, and the distal end portion extends to a position spaced apart from the innermost portion of the gas-liquid separation chamber 230A by a predetermined interval. Here, at least the space of the gas-liquid separation chamber 230A in which the inner cylinder 230B is disposed functions as a separation portion that separates the lubricating oil from the gas refrigerant, and is substantially cylindrical in shape at the innermost portion of the gas-liquid separation chamber 230A. This space is located below the separation part and functions as a storage part for temporarily storing the lubricating oil separated by the oil separator 230.

The opening of the gas-liquid separation chamber 230A in the rear housing 146 is closed by a bolt (not shown) that can press the inner cylinder 230B. The bolt is formed with a through-hole penetrating from the end surface of the head portion to the tip end portion of the shaft portion. A discharge port P2 for connecting piping is formed at the head of the bolt in order to guide the gaseous refrigerant from which the lubricating oil is separated by the oil separator 230 to a condenser (not shown). The gas-liquid separation chamber 230A communicates with the discharge chamber H2 via an introduction port 146C extending in the tangential direction of the inner peripheral surface thereof.

Therefore, the gaseous refrigerant compressed by the scroll unit 120 is introduced into the oil separator 230 from the introduction port 146C through the discharge chamber H2. As shown in FIG. 2, the gas refrigerant introduced into the oil separator 230 moves downward while swirling in an annular space formed by the inner peripheral surface of the gas-liquid separation chamber 230A and the outer peripheral surface of the inner cylinder 230B. And flow. At this time, the mist of the lubricating oil contained in the gas refrigerant receives a centrifugal force generated when the gas refrigerant swirls and moves outward. When the lubricant mist moves outward, it adheres to the inner peripheral surface of the gas-liquid separation chamber 230A and is dropped onto the bottom using gravity. Then, the lubricating oil separated by the oil separator 230 is guided to a pressure supply passage L3 described later. On the other hand, the gaseous refrigerant from which the lubricating oil has been separated enters the internal space from the tip of the inner cylinder 230B, and is discharged from a discharge port P2 formed in the head of the bolt using the pressure.

In FIG. 1, the flow of the gaseous refrigerant before or after mixing the lubricating oil is indicated by a hatched arrow, and the flow of the gaseous refrigerant (mixed fluid) mixed with the lubricating oil is indicated by a black arrow. The flow of lubricating oil separated from the refrigerant is indicated by white arrows.

The electric motor 160 is composed of, for example, a three-phase AC motor, and includes a rotor 162 and a stator core unit 164 disposed on the radially outer side of the rotor 162. For example, a direct current from an on-vehicle battery (not shown) is converted into an alternating current by the inverter 180 and supplied to the electric motor 160.

The rotor 162 is rotatably supported on the radially inner side of the stator core unit 164 via a drive shaft 166 that is press-fitted into a shaft hole formed at the center in the radial direction. One end portion of the drive shaft 166 is rotatably supported by the support portion 142B1 of the front housing 142. The other end of the drive shaft 166 passes through a through hole formed in the center housing 144 and is rotatably supported by the bearing 200. When a magnetic field is generated in the stator core unit 164 by power feeding from the inverter 180, a rotational force acts on the rotor 162, and the drive shaft 166 is rotationally driven. The other end of the drive shaft 166 is connected to the orbiting scroll 124 via the crank mechanism 240.

The crank mechanism 240 is attached in an eccentric state to a substantially cylindrical boss portion 240A that protrudes from the end surface on the back pressure chamber H4 side of the bottom plate 124A of the orbiting scroll 124 and a crank 240B that is provided at the other end portion of the drive shaft 166. And an eccentric bush 240C. The eccentric bush 240C is rotatably supported by the boss portion 240A. Note that a balancer weight 240 D is attached to the other end portion of the drive shaft 166 to resist centrifugal force during the operation of the orbiting scroll 124. Therefore, the orbiting scroll 124 can revolve around the axis of the fixed scroll 122 via the crank mechanism 240 in a state where the rotation of the orbiting scroll 124 is suppressed. Here, the scroll unit 120, the drive shaft 166, and the crank mechanism 240 are cited as examples of the compression mechanism.

FIG. 3 is a block diagram for explaining the flow of refrigerant and lubricating oil in the scroll compressor 100.

As shown in FIGS. 1 and 3, the low-pressure / low-temperature gas refrigerant from the evaporator is introduced into the suction chamber H1 through the suction port P1, and then the outer end of the scroll unit 120 through the refrigerant introduction passage L1. To the space H5 near the section. The gaseous refrigerant in the space H5 is taken into the compression chamber H3 of the scroll unit 120 and compressed. The compressed refrigerant compressed in the compression chamber H3 is discharged to the discharge chamber H2 through the discharge passage L2 and the check valve 220, and is then guided from the discharge chamber H2 to the oil separator 230 through the introduction port 146C. The gaseous refrigerant from which the lubricating oil is separated by the oil separator 230 is discharged to the condenser through the discharge port P2. In this way, the scroll unit 120 that compresses the gaseous refrigerant flowing in through the suction chamber H1 in the compression chamber H3 and discharges the compressed refrigerant through the discharge chamber H2 is configured.

Here, as shown in FIG. 1, a back pressure control valve 250 for adjusting the pressure of the back pressure chamber H4 is further incorporated in the rear end portion of the rear housing 146.

The back pressure control valve 250 operates according to the suction pressure Ps of the suction chamber H1 and the discharge pressure Pd of the discharge chamber H2, and the back pressure Pm of the back pressure chamber H4 is a target back pressure according to the suction pressure Ps and the discharge pressure Pd. This is a known mechanical (autonomous) flow control valve that automatically adjusts the valve opening so as to approach Pc.

As shown in FIGS. 1 and 3, the scroll compressor 100 includes a pressure supply passage L3 and a pressure release passage L4 in addition to the refrigerant introduction passage L1 and the discharge passage L2.

The back pressure control valve 250 is disposed in the middle of the pressure supply passage L3 so as to constitute a part of the pressure supply passage L3. Accordingly, the lubricating oil separated by the oil separator 230 is supplied to the back pressure chamber H4 via the pressure supply passage L3 while being appropriately decompressed by the back pressure control valve 250. That is, by adjusting the opening of the pressure supply passage L3 connected to the inlet side (upstream side) of the back pressure chamber H4 with the back pressure control valve 250, the flow rate of the lubricating oil flowing into the back pressure chamber H4 is increased or decreased. Then, the back pressure Pm is adjusted.

The pressure relief passage L4 communicates the back pressure chamber H4 and the suction chamber H1. An orifice OL is arranged in the middle of the pressure release passage L4. The pressure release passage L4 in which the orifice OL is disposed is formed so as to penetrate the drive shaft 166 and extend along the central axis of the drive shaft 166. For example, the orifice OL is disposed at the end of the drive shaft 166 on the suction chamber H1 side. The lubricating oil in the back pressure chamber H4 is returned to the suction chamber H1 while the flow rate is limited by the orifice OL.

Then, the orbiting scroll 124 is pressed toward the fixed scroll 122 by the back pressure Pm in the back pressure chamber H4. During the compression operation of the scroll unit 120, the resultant force of the back pressure Pm acting on the back pressure chamber H4 side end surface of the bottom plate 124A of the orbiting scroll 124 is smaller than the compression reaction force acting on the compression chamber H3 side end surface of the bottom plate 124A. When the back pressure is insufficient, a gap is generated between the tip of the wrap 124B of the orbiting scroll 124 and the bottom plate 122A of the fixed scroll 122, and the bottom plate 124A of the orbiting scroll 124 and the tip of the wrap 122B of the fixed scroll 122 There may be a gap between them, which may reduce the volumetric efficiency of the compressor. For this reason, the back pressure Pm is adjusted by the back pressure control valve 250 so that the resultant force is greater than the compression reaction force.

On the other hand, when the resultant force due to the back pressure Pm in the back pressure chamber H4 is too higher than the compression reaction force, that is, when the back pressure is excessive, the frictional force between the fixed scroll 122 and the orbiting scroll 124 becomes large. The machine efficiency is reduced. For this reason, when the back pressure Pm exceeds the target back pressure Pc, the back pressure control valve 250 reduces the back pressure Pm so as to approach the target back pressure Pc so that the back pressure does not become excessive.

Incidentally, contamination such as sludge is mixed in the lubricating oil separated by the oil separator 230. When contamination is introduced into the back pressure control valve 250 located downstream of the oil separator 230, for example, the valve body of the back pressure control valve 250 cannot move smoothly, and the back pressure Pm in the back pressure chamber H4 is reduced to the target back pressure. There is a possibility that the pressure Pc cannot be adjusted. When contamination is introduced into the orifice OL located downstream of the oil separator 230, for example, the flow path of the lubricating oil is blocked or narrowed, and the lubricating oil is transferred from the back pressure chamber H4 to the suction chamber H1. It may be difficult to return, and the back pressure Pm in the back pressure chamber H4 may not be adjusted to the target back pressure Pc.

Therefore, in the oil separator 230, in order to precipitate and capture the contamination mixed in the lubricating oil, the lubricating oil separated by the separation unit is temporarily stored between the separation unit and the storage unit, and the supernatant is stored. A capturing member to be discharged is disposed in the section.

FIG. 4 shows a first embodiment of a capture member that captures contamination.
A trapping member 260 that forms a hat-shaped partition wall is disposed between the tip of the inner cylinder 230B and the bottom wall of the gas-liquid separation chamber 230A. The capturing member 260 includes a thin circular ring part 262, a cylindrical cylindrical part 264 that rises from the inner peripheral edge of the circular ring part 262, and a circular disk part 266 that closes the tip opening of the cylindrical part 264. And. Here, the cylindrical part 264 is an example of a part that rises toward the separation part.

The outer peripheral edge of the annular part 262 is fixed to the inner peripheral surface of the gas-liquid separation chamber 230A. The cylindrical portion 264 is formed with a plurality of small holes 264A that connect the inner peripheral surface and the outer peripheral surface on the cross section thereof. The opening area of the small hole 264A is appropriately determined in consideration of, for example, the viscosity of the lubricating oil so that the lubricating oil can pass therethrough. The formation position of the small hole 264A is appropriately determined in consideration of, for example, the amount of captured lubricating oil. Note that the disc portion 266 is not limited to a flat surface, and may be a part of a spherical surface, a cone, or the like with a central portion protruding upward.

According to the trapping member 260, the lubricating oil OIL that adheres to and drops on the inner peripheral surface of the gas-liquid separation chamber 230A is the inner peripheral surface of the gas-liquid separation chamber 230A, the upper surface of the annular portion 262, and the outer periphery of the cylindrical portion 264. It is received by a substantially ring-shaped region partitioned by a surface. The lubricating oil OIL received in this region passes through the small hole 264A of the cylindrical portion 264 and is discharged to the lower portion of the gas-liquid separation chamber 230A that functions as a storage portion. At this time, since the lubricating oil OIL is once received in the substantially annular region, the supernatant is discharged to the lower part of the gas-liquid separation chamber 230A through the small hole 264A of the cylindrical portion 264. Contamination CON contaminated with OIL can be precipitated and captured.

Accordingly, contamination introduced into the back pressure control valve 250 and the orifice OL located downstream of the oil separator 230 is reduced, and control failure and lubrication failure due to contamination are suppressed, and the durability of the scroll compressor 100 is improved. Can be improved. Note that the minor contamination that could not be collected by the oil separator 230 is discharged to the outside together with the gaseous refrigerant, and is captured by, for example, a receiver dryer provided in the refrigerant circuit.

A part of the lubricating oil dropped on the substantially annular region may be wound up by the swirling flow of the gas refrigerant swirling around the outer periphery of the inner cylinder 230B and sucked from the tip of the inner cylinder 230B. Therefore, in order to suppress the rolling-up of the lubricating oil, as shown in FIG. 5, a flange portion 268 having a thin disc shape is formed on the upper portion of the capturing member 260, specifically, on the outer peripheral edge of the disc portion 266. You may make it integrate. In this way, even if a part of the lubricating oil is wound up by the swirling flow, it hits the lower surface of the flange 268 and returns to the lower side, so the absolute amount of lubricating oil sucked from the tip of the inner cylinder 230B is reduced. can do. In addition, the collar part 268 is applicable also to the capture member demonstrated below.

FIG. 6 shows a second embodiment of a capture member that captures contamination.
A trapping member 270 that forms a hat-shaped partition is disposed between the tip of the inner cylinder 230B and the bottom wall of the gas-liquid separation chamber 230A. The capturing member 270 includes a thin annular plate-shaped annular portion 272 whose central portion in the radial direction protrudes downward, a truncated cone-shaped cone portion 274 that rises from the inner peripheral edge of the annular portion 272, and the tip of the cone portion 274. And a disk-shaped disk part 276 whose upper part protrudes upward while closing the opening. Here, the conical part 274 is mentioned as an example of the part which stands up toward the separation part.

The outer peripheral edge of the annular portion 272 is fixed to the inner peripheral surface of the gas-liquid separation chamber 230A. The conical portion 274 is formed with a plurality of small holes 274 A that connect the inner peripheral surface and the outer peripheral surface on the cross section. The opening area of the small hole 274A is appropriately determined in consideration of, for example, the viscosity of the lubricating oil so that the lubricating oil can pass therethrough. The formation position of the small hole 274A is appropriately determined in consideration of, for example, the amount of captured lubricating oil.

According to the trapping member 270, the lubricating oil OIL that adheres to and drops on the inner peripheral surface of the gas-liquid separation chamber 230A is received at least on the upper surface of the annular portion 272 whose central portion in the radial direction protrudes downward. The lubricating oil received by the annular portion 272 passes through the small hole 274A of the conical portion 274 and is discharged below the gas-liquid separation chamber 230A that functions as a storage portion. At this time, the lubricating oil OIL is once received by the annular portion 272, and then the supernatant is discharged to the lower part of the gas-liquid separation chamber 230A through the small hole 274A of the conical portion 274. Contaminating contamination CON can be precipitated and captured.

Accordingly, as in the first embodiment, the contamination introduced into the back pressure control valve 250 and the orifice OL located downstream of the oil separator 230 is reduced, and control failures and lubrication failures due to contamination are suppressed. The durability of the scroll compressor 100 can be improved. In the capturing member 270, the outer peripheral edge of the disc part 276 can be directly connected to the inner peripheral edge of the annular part 272 without using the conical part 274. In this case, a plurality of small holes through which the lubricating oil can flow can be formed in at least one of the annular portion 272 and the disc portion 276, which is an example of a portion that rises toward the separation portion.

FIG. 7 shows a third embodiment of a capture member that captures contamination.
A trapping member 280 that forms a partition having a shape described below is disposed between the tip of the inner cylinder 230B and the bottom wall of the gas-liquid separation chamber 230A. The capture member 280 includes a thin annular ring portion 282, a cylindrical cylindrical portion 284 that rises from the inner peripheral edge of the annular portion 282, and a thin annular ring shape that extends radially outward from the upper end of the cylindrical portion 284. And the collar portion 286. Here, the cylindrical part 284 is mentioned as an example of the part which stands up toward the separation part.

The outer peripheral edge of the annular portion 282 is fixed to the inner peripheral surface of the gas-liquid separation chamber 230A. The cylindrical portion 284 is formed with a plurality of small holes 284A that connect the inner peripheral surface and the outer peripheral surface on the cross section. The opening area of the small hole 284A is appropriately determined in consideration of, for example, the viscosity of the lubricating oil so that the lubricating oil can pass therethrough. The position where the small hole 284A is formed is appropriately determined in consideration of, for example, the amount of lubricating oil captured. In addition, the collar part 286 suppresses that a part of lubricating oil received with the capture member 280 is wound up similarly to the collar part 268 shown in FIG.

According to the trapping member 280, the lubricating oil OIL attached and dripped onto the inner peripheral surface of the gas-liquid separation chamber 230A is the inner peripheral surface of the gas-liquid separation chamber 230A, the upper surface of the annular portion 282, and the outer periphery of the cylindrical portion 284. It is received by a substantially ring-shaped region partitioned by a surface. The lubricating oil OIL received in this region passes through the small hole 284A of the cylindrical portion 284 and is discharged to the lower portion of the gas-liquid separation chamber 230A that functions as a storage portion. At this time, the lubricating oil OIL is once received in a substantially ring-shaped region, and then the supernatant is discharged to the lower portion of the gas-liquid separation chamber 230A through the small hole 284A of the cylindrical portion 284. Contamination CON contaminated with OIL can be precipitated and captured.

Further, since the upper end opening of the cylindrical portion 284 is not closed, the number of components of the capturing member 280 is reduced, and its weight can be reduced. Even if the upper end opening of the cylindrical portion 284 is not closed, the lubricating oil OIL is dripped along the inner peripheral surface of the gas-liquid separation chamber 230A, so that the lubricating oil passes through the upper end opening of the cylindrical portion 284 and is lubricated to the lower portion. There is little possibility that oil OIL will drop directly. Here, the upper end opening of the cylindrical portion 284 is an example of a communication hole that allows the separation portion and the storage portion to communicate with each other.

Accordingly, as in the first and second embodiments, contamination introduced into the back pressure control valve 250 and the orifice OL located downstream of the oil separator 230 is reduced, resulting in poor control and poor lubrication due to contamination. And the durability of the scroll compressor 100 can be improved. In addition, when there is little possibility that a part of lubricating oil is wound up, the collar part 286 can also be abbreviate | omitted.

FIG. 8 shows a modification of the capturing member.
The capturing member 290 according to the modified example includes a truncated cone-shaped cone portion 292 that gradually decreases in cross-sectional area as it goes upward, and a thin annular plate-shaped flange portion that extends radially outward from the upper end portion of the cone portion 292. 294. Here, the intermediate portion of the conical portion 292 is an example of a portion that rises toward the separation portion. The outer peripheral edge of the lower end portion of the conical portion 292 is fixed to the inner peripheral surface of the gas-liquid separation chamber 230A. Further, the conical portion 292 is formed with a plurality of small holes 292A that connect the inner peripheral surface and the outer peripheral surface on the cross section thereof.

Then, the substantially ring-shaped region defined by the inner peripheral surface of the gas-liquid separation chamber 230A and the outer peripheral surface of the conical portion 292 receives the lubricating oil OIL dripped along the inner peripheral wall of the gas-liquid separation chamber 230A. The lubricating oil OIL received in this region passes through the small hole 292A of the conical portion 292 and is discharged to the lower portion of the gas-liquid separation chamber 230A that functions as a storage portion. Since the action and effect of the capturing member 290 are the same as those of the first to third embodiments described above, the description thereof will be omitted to avoid redundant description. Please refer to the previous explanation if necessary.

Thus, the capturing member that captures contamination mixed in the lubricating oil can take various shapes. That is, the capturing member only needs to have at least a shape having a function of temporarily storing the lubricating oil separated by the separating portion and discharging the supernatant to the storing portion. As in the prior art, even if the back pressure control valve 250 is provided with a filter, the absolute amount of contamination introduced here is reduced, so that it does not clog in a short time.

In the embodiment described above, the compressor is assumed to be a scroll compressor, but it may be a reciprocating compressor, a swash plate compressor, a rotary piston compressor, a slide vane compressor, or the like. Further, the oil separator is not limited to the centrifugal separation type, and may be a method of separating the lubricating oil from the gaseous refrigerant through a labyrinth passage, for example.

100 scroll compressor (compressor)
230 Oil separator 260 Capturing member 264 Cylindrical portion 264A Small hole 268 Ridge portion 270 Capturing member 274 Conical portion 274A Small hole 280 Capturing member 284 Cylindrical portion 284A Small hole 286 Ridge portion 290 Capturing member 292 Conical portion 292A Small hole 294 Spear portion OIL Lubrication oil

Claims

A compression unit including an oil separator having a separation unit that separates the lubricating oil from the working fluid using centrifugal force, and a storage unit that is located below the separation unit and stores the lubricating oil separated by the separation unit. Machine,
Between the separation part and the storage part, a capture member that temporarily stores the lubricating oil separated by the separation part and discharges the supernatant to the storage part is disposed,
Compressor.
The capture member has a portion that rises toward the separation portion, and at least one small hole that allows the supernatant of the lubricating oil to pass therethrough is formed in the portion.
The compressor according to claim 1.
The capture member is a hat-shaped partition wall,
The compressor according to claim 2.
In the central portion of the capture member, a communication hole that connects the separation portion and the storage portion is formed,
The compressor according to claim 3.
In the upper part of the capturing member, an annular flange extending radially outward is integrated,
The compressor according to claim 3 or 4.