Compressor

Abstract

To provide a compressor capable of reducing the possibility that lubricating oil containing a large amount of refrigerant is supplied to a sliding part.SOLUTION: The compressor includes a compression mechanism 60 that compresses a refrigerant, a drive shaft 70 that extends in a vertical direction and drives the compression mechanism 60, a housing 10 in which the compression mechanism 60 and the drive shaft 70 are accommodated and in which a liquid reservoir 98 is formed at a bottom portion, the liquid reservoir 98 introducing a refrigerant and a lubricating oil having a higher temperature and a lower density than the refrigerant, a pump portion 93 that up the liquid stored in the liquid reservoir 98, and a resistance member 95 that is provided below the drive shaft 70 and serves as a resistance to a flow of the liquid stored in the liquid reservoir 98. The liquid is sucked up from the second region R2 of the liquid reservoir 98 by the pump portion 93, and the resistance member 95 is installed between the first region and the second region R2.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a compressor. [Background technology]

[0002] For example, Patent Document 1 discloses a scroll compressor in which lubricating oil is sucked from an oil reservoir, the sucked lubricating oil is supplied to bearings, and the lubricating oil that has lubricated the bearings is returned to the oil reservoir via a partition plate. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Utility Model Application Publication No. 4-52585 Summary of the Invention [Problem to be solved by the invention]

[0004] The refrigerant drawn into the housing (shell in Patent Document 1) through the suction pipe is mainly guided to the compression mechanism. However, some of the refrigerant liquefies and flows along the inner circumferential surface of the housing into a liquid reservoir formed at the bottom of the housing. Some compressors are configured to return a portion of the liquid refrigerant to the housing through an injection pipe. The liquid refrigerant returned to the housing vaporizes and is primarily guided to the compression mechanism. However, some of the liquid refrigerant does not vaporize and flows along the inner circumferential surface of the housing into a liquid reservoir formed at the bottom of the housing.

[0005] In this way, at least the lubricating oil and liquid refrigerant are introduced into and stored in the liquid reservoir, but since the density of the lubricating oil is usually lower than the density of the liquid refrigerant, the refrigerant will be located in the lower layer and the lubricating oil will be located in the upper layer in the liquid reservoir.

[0006] When the liquid that has separated into two layers is pumped up from the liquid reservoir, the liquid refrigerant in the lower layer may be directly pumped up by the pump. If this happens, the lubricating oil supplied to the sliding parts may contain a large amount of refrigerant, which may result in insufficient lubrication of the sliding parts and a loss of reliability of the sliding parts.

[0007] The present disclosure has been made in consideration of the above circumstances, and aims to provide a compressor that can reduce the possibility of lubricating oil containing a large amount of refrigerant being supplied to sliding parts. [Means for solving the problem]

[0008] In order to solve the above problems, the compressor of the present disclosure employs the following measures. That is, a compressor according to one aspect of the present disclosure includes a compression mechanism that compresses a refrigerant, a drive shaft that extends vertically and drives the compression mechanism, a housing that accommodates the compression mechanism and the drive shaft and has a liquid reservoir formed at its bottom into which the refrigerant and lubricating oil, which has a higher temperature and a lower density than the refrigerant, are guided, and a liquid reservoir that is provided below the drive shaft and into which the refrigerant and lubricating oil stored in the liquid reservoir are guided. and a resistance member provided at the bottom of the housing and providing resistance to the flow of the liquid stored in the liquid reservoir, wherein the liquid refrigerant and lubricating oil are guided to a first region of the liquid reservoir, and liquid is sucked up from a second region of the liquid reservoir by the pump member, and the resistance member is installed between the first region and the second region. [Effects of the Invention]

[0009] According to the present disclosure, it is possible to reduce the possibility that lubricating oil containing a large amount of refrigerant will be supplied to sliding parts. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a longitudinal sectional view of a scroll compressor according to an embodiment of the present disclosure. FIG. [Figure 2] 2 is a cross-sectional view of the scroll compressor taken along line II-II in FIG. 1 (first embodiment). [Figure 3] FIG. 3 is a cross-sectional view of a scroll compressor taken at the same cutting position as in FIG. 2 (Embodiment 2). [Figure 4] 3 is a cross-sectional view of the scroll compressor taken at the same cutting position as in FIG. 2 (third embodiment, housing and the like are omitted). [Figure 5] 3 is a cross-sectional view of the scroll compressor taken at the same cutting position as in FIG. 2 (third embodiment, housing and the like are omitted). DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, a compressor according to an embodiment of the present disclosure will be described with reference to the drawings.

[0012] [Scroll compressor configuration] A scroll compressor 1, which is an example of a compressor, is one of the devices that constitute a refrigeration cycle of an air conditioner or the like, and is a device that compresses a refrigerant sealed in the refrigeration cycle. In addition to the scroll compressor 1, the refrigeration cycle includes devices such as a condenser, an expansion valve, and an evaporator (not shown), as well as piping connecting these devices. The refrigeration cycle may be, for example, an injection cycle configured so that liquid refrigerant is introduced into the scroll compressor 1.

[0013] As shown in FIG. 1, scroll compressor 1 includes housing 10 defining an enclosed space therein, discharge cover 20 vertically dividing the enclosed space, compression mechanism 60 compressing refrigerant, drive shaft 70 driving compression mechanism 60, electric motor 75 rotating drive shaft 70, pump section 93 sucking up liquid containing lubricating oil, and resistance member 95 providing resistance to the flow of the liquid.

[0014] The housing 10 is, for example, a sealed container made of metal, and has a cylindrical intermediate housing 12 centered on an axis X extending vertically, an upper housing 11 that closes the upper end opening of the intermediate housing 12, and a lower housing 13 that closes the lower end opening of the intermediate housing 12.

[0015] The middle housing 12 and the upper housing 11 are connected with the outer peripheral end 21 of the discharge cover 20 sandwiched vertically therebetween. In this case, the outer peripheral end 21 of the discharge cover 20 can be considered as part of the peripheral wall of the housing 10. The discharge cover 20 vertically divides the sealed space defined by the housing 10. Of the divided sealed spaces, the space above the discharge cover 20 is the discharge chamber C1, and the space below the discharge cover 20 is the suction chamber C2.

[0016] The intermediate housing 12 and the lower housing 13 are connected in a state in which the inner peripheral surface of the lower housing 13 is fitted onto the outer peripheral surface of the intermediate housing 12 .

[0017] A discharge pipe 31 is provided on the top surface of the upper housing 11, connecting the discharge chamber C1 to the outside of the upper housing 11 (housing 10), and is configured so that the refrigerant in the discharge chamber C1 is discharged to the outside of the upper housing 11. A refrigerant pipe (not shown) is connected to the end of the discharge pipe 31 (the end located outside the upper housing 11), and the refrigerant discharged from the discharge pipe 31 is guided to the condenser.

[0018] A refrigerant introduction point 12a is provided on the peripheral wall of the intermediate housing 12, connecting the inside (sealed space) of the housing 10 with the outside, and an end of a suction pipe 32 is connected to the refrigerant introduction point 12a. The other end of the suction pipe 32 is connected to a refrigerant pipe, and the gas refrigerant evaporated in the evaporator is guided through the suction pipe 32 to the suction chamber C2.

[0019] A refrigerant introduction point 21a that connects the inside (sealed space) of the housing 10 to the outside is provided at the outer peripheral end 21 of the discharge cover 20, and an end of an injection pipe 33 is connected to the refrigerant introduction point 21a. A refrigerant pipe is connected to the other end of the injection pipe 33, and the liquid refrigerant is introduced into the suction chamber C2 through the injection pipe 33. The liquid refrigerant is, for example, a condensed portion of the gas refrigerant compressed by the scroll compressor 1.

[0020] In the suction chamber C2, there are provided devices and components such as a compression mechanism 60 for compressing the refrigerant, a drive shaft 70, an electric motor 75, a support member 80, and a resistance member 95.

[0021] The compression mechanism 60 has a fixed scroll 61 having a spiral-shaped fixed side wall body 63 erected on a fixed side end plate 62, and a revolving scroll 65 having a spiral-shaped revolving side wall body 67 erected on a revolving side end plate 66. The fixed scroll 61 and the orbiting scroll 65 define a compression chamber C3 by the fixed side wall body 63 and the orbiting side wall body 67 meshing with each other.

[0022] The fixed scroll 61 is fixed to the support member 80 via a fixing portion 62 a formed on the outer peripheral end portion of the fixed side end plate 62 . The support member 80 is fixed to the intermediate housing 12. As described above, the support member 80 is a member to which the fixed scroll 61 is fixed, a member that functions as a bearing that supports the drive shaft 70 in the radial direction, and a member that supports the orbiting scroll 65 in the direction of the axis X (details will be described later).

[0023] Above the fixed scroll 61, a discharge cover 20 is disposed. A cylindrical protrusion is formed in the center of the lower surface of the discharge cover 20 (the surface facing the fixed-side end plate 62), and this protrusion is fitted into an annular protrusion formed in the center of the back surface (the surface facing the discharge cover 20) of the fixed-side end plate 62. Then, by fitting the cylindrical protrusion of the discharge cover 20 into the annular protrusion of the fixed-side end plate 62, a back pressure chamber C4 is defined between the discharge cover 20 and the fixed-side end plate 62.

[0024] A discharge port 62b that connects the compression chamber C3 and the back pressure chamber C4 is formed in the fixed end plate 62. Furthermore, a discharge port 22 that connects the back pressure chamber C4 and the discharge chamber C1 is formed in the discharge cover 20. That is, the compression chamber C3 and the discharge chamber C1 are in communication with each other via the discharge port 62b, the back pressure chamber C4, and the discharge port 22.

[0025] A reed valve 52 and a retainer 53 that restricts the range of movement of the reed valve 52 are provided at the outlet of the discharge port 22. This ensures that the refrigerant is discharged from the discharge port 22 to the discharge chamber C1 only when the refrigerant reaches a predetermined pressure.

[0026] High-pressure refrigerant compressed by the compression mechanism 60 is introduced into the discharge chamber C1. Meanwhile, low-pressure refrigerant is introduced into the suction chamber C2 via the suction pipe 32. The low-pressure refrigerant introduced into the suction chamber C2 is then drawn into the compression mechanism 60. Therefore, the scroll compressor 1 of this embodiment has a structure in which the discharge cover 20 serves as a partition between the high-pressure space and the low-pressure space, and devices and parts such as the compression mechanism 60, drive shaft 70, and electric motor 75 are arranged in the low-pressure space. Note that the element separating the high-pressure space and the low-pressure space does not necessarily have to be the discharge cover 20, and the separation may also be achieved by, for example, the fixed scroll 61.

[0027] The orbiting scroll 65 is configured to revolve around the axis X relative to the fixed scroll 61 by means of a drive shaft 70 and a known rotation prevention mechanism.

[0028] The drive shaft 70 is a shaft member that transmits the driving force from the electric motor 75 to the orbiting scroll 65 to drive the compression mechanism 60, and extends in the vertical direction. The drive shaft 70 has a main shaft portion 71 having a vertically extending axis X as its central axis, and a crank shaft portion 72 that is eccentric with respect to the axis X. An oil supply passage 70a extending vertically is formed inside the drive shaft 70. The lower end of the oil supply passage 70a is open and is configured to receive liquid from a pump unit 93, which will be described later. The upper end of the oil supply passage 70a is also open and is configured to supply liquid to a drive bushing 85, a journal bearing 87, and the vicinity thereof (hereinafter, these will be referred to as "sliding parts"), which will be described later.

[0029] A rotor 75a of an electric motor 75 is fitted onto the outer circumferential surface of the main shaft portion 71. On the other hand, a stator 75b of the electric motor 75, which is paired with the rotor 75a, is fitted onto the inner circumferential surface of the intermediate housing 12. The upper part of the main shaft portion 71 is inserted into a journal bearing portion 81 of a support member 80 and is journal-supported by the journal bearing portion 81 in the radial direction. The lower part of the main shaft part 71 is journal-supported in the radial direction and in the direction of the axis X by a lower bearing 91. That is, the lower bearing 91, which is located at the bottom of the housing 10, functions as a journal bearing and a thrust bearing for the main shaft part 71.

[0030] A cylindrical drive bush 85 extending vertically is attached to the outer peripheral surface of the crankshaft 72 . A counterweight 86 is attached to the outer circumferential surface of the drive bush 85 .

[0031] A cylindrical bearing boss 66a with an open bottom end is formed in the center of the bottom surface of the orbiting side end plate 66. The crankshaft portion 72 of the drive shaft 70 is connected to the bearing boss 66 a via a drive bush 85 and a journal bearing 87 .

[0032] An annular thrust plate 82 fixed to a support member 80 is in contact with the lower surface of the orbiting-side end plate 66. This allows the orbiting scroll 65 to be supported in a state where it can slide relative to the support member 80 (thrust plate 82) in a direction perpendicular to the axis X.

[0033] A pump section 93 is provided below and below the main shaft section 71 . The pump portion 93 is a mechanism that sucks up liquid from a liquid reservoir 98 formed in the bottom of the housing 10 (the bottom of the lower housing 13). The pump portion 93 is driven by the rotation of the main shaft portion 71. Here, the liquid includes lubricating oil and / or liquid refrigerant. The liquid may be, for example, only lubricating oil, only liquid refrigerant, or a mixture thereof.

[0034] The pump section 93 has a nozzle 94, at least the lower part of which is submerged in the liquid stored in the liquid reservoir 98. The pump section 93 sucks up the liquid from the liquid reservoir 98 through the nozzle 94, and supplies the sucked up liquid to the sliding section through the oil supply passage 70a of the drive shaft 70. The nozzle 94 has, for example, a cylindrical shape extending in the vertical direction. A suction port 94a is formed in the lower end surface of the nozzle 94, and liquid is sucked in through this suction port 94a. To ensure that the pump unit 93 can reliably suck up the liquid (e.g., lubricating oil) even when the liquid level drops, it is preferable that the suction port 94a of the nozzle 94 be located near the bottom surface 13a of the lower housing 13. However, if the suction port 94a of the nozzle 94 is located excessively close to the bottom surface 13a of the lower housing 13, there is a possibility that foreign matter accumulated at the bottom of the lower housing 13 will be sucked up. Therefore, for example, it is preferable that the suction port 94a be separated from the bottom surface 13a by a distance equal to or greater than the diameter of the suction port 94a.

[0035] An upper oil return portion 12b and a lower oil return portion 12c are provided on the peripheral wall of the intermediate housing 12, which communicate between the inside (sealed space) of the housing 10 and the outside. The upper oil return portion 12b is located higher than the lower oil return portion 12c. The upper oil return point 12 b and the lower oil return point 12 c are connected via an oil return pipe 34 located outside the intermediate housing 12 . An oil return flow path 83 extending horizontally is formed in the support member 80. The oil return flow path 83 is a flow path that guides the liquid discharged from the sliding portion (the liquid that has lubricated the sliding portion) to the upper oil return point 12b of the intermediate housing 12. The liquid discharged from the sliding portion is guided back into the housing 10 (middle housing 12) via the oil return flow path 83 and the oil return pipe 34.

[0036] [Refrigerant and lubricant flow in scroll compressors] The gas refrigerant evaporated in the evaporator is guided through the suction pipe 32 to the suction chamber C2. The gas refrigerant introduced into the suction chamber C2 is taken into the compression chamber C3 of the compression mechanism 60, and is gradually compressed from the outside toward the center of the compression chamber C3. The compressed gas refrigerant is guided from the compression chamber C3 to the back pressure chamber C4 through a discharge port 62b formed in the fixed side end plate 62. The gas refrigerant introduced into the back pressure chamber C4 is introduced from the back pressure chamber C4 through a discharge port 22 formed in the discharge cover 20 to the discharge chamber C1. The gas refrigerant introduced into the discharge chamber C1 is then introduced via the discharge pipe 31 to the outside of the upper housing 11 (housing 10).

[0037] The liquid refrigerant obtained by condensing a part of the gas refrigerant compressed by the scroll compressor 1 is introduced into the suction chamber C2 via the injection pipe 33. The liquid refrigerant introduced into the suction chamber C2 is vaporized (evaporated) and taken into the compression chamber C3 of the compression mechanism 60, where it is compressed together with the gas refrigerant introduced into the suction chamber C2 via the suction pipe 32.

[0038] As described above, the gas refrigerant introduced into the suction chamber C2 through the suction pipe 32 is mainly taken into the compression chamber C3, but a portion of the gas refrigerant is liquefied and flows along the inner surfaces of the housing 10 (the middle housing 12 and the lower housing 13) and introduced into the liquid reservoir 98 formed at the bottom of the housing 10 (the lower housing 13). Furthermore, a portion of the liquid refrigerant introduced into the suction chamber C2 via the injection pipe 33 flows along the inner circumferential surface of the housing 10 and is introduced into a liquid reservoir 98 formed at the bottom of the housing 10 without being vaporized.

[0039] When the pump unit 93 is driven, the lubricating oil stored in a reservoir 98 formed at the bottom of the housing 10 is sucked up through the suction port 94 a of the nozzle 94 . The lubricating oil that has been sucked up is supplied to the upper part of the sliding portion through the oil supply passage 70a of the drive shaft 70, and lubricates the sliding portion. The lubricating oil that has lubricated the sliding parts is discharged from the bottom of the sliding parts. The temperature of the discharged lubricating oil is at least higher than the temperature of the refrigerant. The density of the lubricating oil is also lower than the density of the refrigerant. The lubricating oil discharged from the sliding parts is guided back into the housing 10 (middle housing 12) via, for example, an oil return flow path 83 formed in the support member 80 and the oil return pipe 34. At this time, the lower oil return point 12c connected to the lower end of the oil return pipe 34 is located, for example, near the lower part of the stator 75b of the electric motor 75. In other words, the oil return pipe 34 defines a flow path for guiding the lubricating oil from the oil return flow path 83 into the housing 10 in a manner that bypasses most of the stator 75b of the electric motor 75. The lubricating oil introduced into the housing 10 flows along the inner circumferential surface of the housing 10 and is introduced into a reservoir 98 formed at the bottom of the housing 10 .

[0040] The oil return pipe 34 is not an essential component, and the lubricating oil discharged from the sliding part may be guided, for example, through an oil return flow path 83 formed in the support member 80 to near the inner surface of the housing 10 (middle housing 12), and from there travel along the inner surface of the housing 10 to a liquid reservoir 98 formed at the bottom of the housing 10.

[0041] [Regarding resistance components] 2, the area (range) of the liquid reservoir 98 into which the liquid refrigerant and lubricating oil that drip down the inner circumferential surface of the housing 10 are guided is defined as a first area R1. On the other hand, the area (range) of the liquid reservoir 98 into which the liquid is pumped up by the pump unit 93 is defined as a second area R2. In this embodiment, the first region R1 is defined as a region (range) near the refrigerant introduction point 12a, the refrigerant introduction point 21a, and the lower oil return point 12c when viewed from the direction of the axis X. Furthermore, because the refrigerant introduction point 12a, the refrigerant introduction point 21a, and the lower oil return point 12c are provided on the peripheral wall of the housing 10, the first region R1 necessarily becomes a region (range) that extends along the inner peripheral surface of the housing 10. On the other hand, the second region R2 is defined as a region (range) near the nozzle 94 (suction port 94a). The first region R1 and the second region R2 are three-dimensional regions having a depth corresponding to the liquid level of the liquid stored in the liquid reservoir 98.

[0042] The liquid refrigerant and lubricating oil are introduced into the liquid reservoir 98, but because the density of the lubricating oil is lower than that of the refrigerant, the refrigerant is located in the lower layer and the lubricating oil is located in the upper layer in the liquid reservoir 98. That is, in the liquid reservoir 98, the liquid containing the lubricating oil and the refrigerant is separated into two layers, an upper layer and an lower layer.

[0043] As described above, since suction port 94a is located near bottom surface 13a of lower housing 13, if no measures are taken, there is a possibility that the liquid refrigerant in the lower layer will be directly sucked up by pump unit 93. If this happens, the lubricating oil supplied to the sliding parts will contain a large amount of refrigerant, which may result in insufficient lubrication of the sliding parts and a loss of reliability of the sliding parts.

[0044] Therefore, in this embodiment, as shown in FIGS. 1 and 2, at least one resistance member 95 is provided between the first region R1 and the second region R2. Resistance member 95 is a member that provides resistance to the flow of the liquid stored in liquid reservoir 98, and is provided at the bottom of housing 10 (the bottom of lower housing 13).

[0045] By providing the resistance member 95, the following effects are achieved. That is, the liquid refrigerant in the lower layer in the first region R1 is less likely to flow into the second region R2, which reduces the possibility that the lubricating oil containing a large amount of refrigerant is sucked up by the pump unit 93, the liquid is supplied to the sliding parts, and malfunctions occur in the sliding parts. Furthermore, the time it takes for the liquid refrigerant introduced into the first region R1 to reach the second region R2 is longer than when the resistance member 95 is not provided. This increases the time that the liquid refrigerant in the lower layer comes into contact with the high-temperature lubricating oil in the upper layer. This ensures time for the liquid refrigerant to evaporate, reducing the amount of liquid refrigerant flowing into the second region R2. This reduces the possibility of a phenomenon occurring in which lubricating oil containing a large amount of refrigerant is sucked up by the pump unit 93 and supplied to the sliding parts, causing malfunctions in the sliding parts. Furthermore, the time it takes for the liquid refrigerant introduced into the first region R1 to reach the second region R2 is longer than when the resistance member 95 is not provided. This increases the time that the liquid refrigerant in the lower layer comes into contact with the high-temperature lubricating oil in the upper layer. This allows the liquid refrigerant to dissolve appropriately in the lubricating oil, cooling the lubricating oil and appropriately reducing the viscosity of the lubricating oil, thereby reducing friction loss at the sliding parts to which the liquid is supplied.

[0046] At this time, it is preferable that the lower end of the resistance member 95 is connected without any gap to the bottom surface 13a of the lower housing 13. This makes it difficult for the liquid refrigerant in the lower layer in the first region R1 to flow into the second region R2. However, a gap may be provided between the lower end of the resistance member 95 and the bottom surface 13a of the lower housing 13. This is because, as long as the resistance member 95 is present, the flow of liquid refrigerant from the first region R1 to the second region R2 is blocked at least more than when the resistance member 95 is not present. From a processing standpoint, it is not easy to form the lower end of the resistance member 95 so that it fits the curved shape of the bottom surface 13a of the lower housing 13. Therefore, the shape of the lower end of the resistance member 95 may be made easier to process, such as a straight line.

[0047] An upper end 96 of the resistance member 95 is preferably located above the lower end surface of the nozzle 94 of the pump portion 93 . This makes it difficult for the liquid refrigerant in the lower layer in the first region R1 to be directly sucked into the suction port 94a of the nozzle 94. Furthermore, it is preferable that the upper end 96 of the resistance member 95 is located below the liquid level during normal operation. That is, it is preferable that the resistance member 95 is submerged in the liquid stored in the liquid reservoir 98 at the liquid level during normal operation. This allows the lubricating oil in the upper layer in the first region R1 to easily flow into the second region R2.

[0048] The material of the resistance member 95 is not particularly limited, and may be, for example, metal or resin. If the resistance member 95 is made of metal, the resistance member 95 can be fixed to the lower housing 13 by welding. If the resistance member 95 is made of resin, the electric motor 75 is unlikely to be damaged even if the resistance member 95 comes off and comes into contact with the electric motor 75 during operation.

[0049] The resistance member 95 will be described below using several examples.

[0050] Example 1 As shown in FIGS. 1 and 2, the resistance member 95 is a cylindrical member having a circular cross-sectional shape (cross-sectional shape in a plane perpendicular to the axis X). The cylindrical resistance member 95 surrounds the entire periphery of the nozzle 94. However, when viewed from the direction of the axis X, the resistance member 95 and the nozzle 94 are spaced apart and do not contact each other. This makes it more difficult for the liquid refrigerant in the lower layer in the first region R1 to flow into the second region R2 than when the resistance member 95 is provided only in a partial range around the nozzle 94. Also, the time it takes for the liquid refrigerant guided to the first region R1 to reach the second region R2 is longer than when the resistance member 95 is provided only in a partial range around the nozzle 94.

[0051] 2, the resistance member 95 stands upright from the bottom surface 13a of the lower housing 13. That is, the lower end of the resistance member 95 is connected to the bottom surface 13a of the lower housing 13 without any gap. However, as described above, there may be a gap between the lower end of the resistance member 95 and the bottom surface 13a of the lower housing 13.

[0052] 2, the center of the resistance member 95 coincides with the axis X. However, the center of the resistance member 95 does not need to coincide with the axis X, and may coincide with, for example, the center of the nozzle 94. In either case, it is sufficient that the resistance member 95 separates the first region R1 and the second region R2, and that the resistance member 95 surrounds the entire area around the nozzle 94. Furthermore, the cross-sectional shape of the resistance member 95 may be other than circular, and may be, for example, elliptical or polygonal.

[0053] The resistance member 95 preferably has a hole 97 formed therein, which connects the inside and outside of the resistance member 95 . This allows at least the liquid containing the lubricating oil to be guided from the first region R1 to the second region R2, even if the liquid level temporarily becomes lower than the upper end of the resistance member 95. Therefore, even if the liquid level temporarily becomes lower than the upper end of the resistance member 95, the lubrication of the sliding parts is at least maintained.

[0054] The hole 97 is preferably formed in the vertical direction within a range from the lower end surface of the nozzle 94 to the bottom surface 13a of the lower housing 13.

[0055] The diameter of the hole 97 is preferably equal to or larger than the diameter of the suction port 94a. If the diameter of hole 97 were smaller than the diameter of suction port 94a, the amount of liquid guided to second region R2 through hole 97 would be less than the amount of liquid sucked in from suction port 94a, which could result in a shortage of liquid (lubricant) in second region R2.

[0056] <Example 2> As shown in FIG. 3, the resistance member 95 is a plate-like member whose cross section is an outwardly convex arc shape. The resistance member 95 surrounds only a portion of the periphery of the nozzle 94. However, when viewed from the direction of the axis X, the resistance member 95 and the nozzle 94 are spaced apart and do not contact each other. Here, the partial range refers to the region between the region in the first region R1 where a relatively large amount of refrigerant is present and the second region R2, for example, the region between the refrigerant introduction point 21a connected to the injection pipe 33 and the suction port 94a of the nozzle 94 when viewed from the direction of the axis X, and / or the region between the refrigerant introduction point 12a connected to the suction pipe 32 and the suction port 94a of the nozzle 94 when viewed from the direction of the axis X. This allows the resistance member 95 to be provided only in the path from the first region R1 to the second region R2 where a relatively large amount of refrigerant flows. Therefore, even if the resistance member 95 is not provided over the entire area around the nozzle 94, the time it takes for the liquid refrigerant guided to the first region R1 to reach the second region R2 can be lengthened.

[0057] The cross-sectional shape of the resistance member 95 may be other than an arc shape, for example, a straight line shape.

[0058] Example 3 4, the resistance member 95 is a member whose cross-sectional shape is a spiral with the nozzle 94 at its center. However, when viewed from the direction of the axis X, the resistance member 95 and the nozzle 94 are spaced apart and do not contact each other. By forming the resistance member 95 in a spiral cross-sectional shape, a spiral path is defined from the first region R1 to the second region R2. The spiral path has a longer distance (the distance can be extended efficiently) than, for example, a linear path from the first region R1 to the second region R2. This increases the time it takes for the liquid refrigerant introduced into the first region R1 to reach the second region R2.

[0059] Furthermore, as shown in Figure 5, the same effect can be achieved by making each resistance member 95 a plate material with a cross-sectional shape that is an outwardly convex arc, and arranging two resistance members 95 so that they sandwich the nozzle 94 and are offset from each other (alternate).

[0060] Example 4 The resistance member 95 described so far may be a mesh member. By forming the resistance member 95 in a mesh shape, the liquid refrigerant is more likely to dissolve into the lubricating oil when passing through the resistance member 95 (mesh). This cools the lubricating oil and reduces the viscosity of the lubricating oil appropriately, reducing friction loss at the sliding parts to which the liquid is supplied.

[0061] [Note] The compressor according to the embodiment of the present disclosure described above can be understood, for example, as follows.

[0062] A scroll compressor (1) according to a first aspect of the present disclosure includes a compression mechanism (60) that compresses a refrigerant, a drive shaft (70) that extends vertically and drives the compression mechanism, a housing (10) that houses the compression mechanism and the drive shaft and has a liquid reservoir (98) formed at its bottom into which the refrigerant and lubricating oil, which has a higher temperature and a lower density than the refrigerant, are guided, a pump section (93) that is provided below the drive shaft and that draws up the liquid stored in the liquid reservoir, and a resistance member (95) that is provided at the bottom of the housing and provides resistance to the flow of the liquid stored in the liquid reservoir, wherein the liquid refrigerant and the lubricating oil are guided to a first region (R1) of the liquid reservoir, and the liquid is drawn up from a second region (R2) of the liquid reservoir by the pump section, and the resistance member is installed between the first region and the second region.

[0063] The housing includes a resistance member at the bottom that resists the flow of the liquid stored in the liquid reservoir, and the liquid refrigerant and lubricating oil are guided to a first region of the liquid reservoir, and the liquid is sucked up from a second region of the liquid reservoir. The resistance member is located between the first and second regions, making it difficult for the liquid refrigerant in the lower layer of the first region to flow into the second region. This reduces the possibility of the lubricating oil containing a large amount of refrigerant being sucked up by the pump unit and supplied to the sliding parts, causing malfunctions in the sliding parts. Furthermore, the time it takes for the liquid refrigerant introduced into the first region to reach the second region is longer than when the resistance member is not provided. Therefore, the liquid refrigerant in the lower layer is in contact with the high-temperature lubricating oil in the upper layer for a longer period of time. This allows time for the liquid refrigerant to evaporate, reducing the amount of liquid refrigerant flowing into the second region. Therefore, it is possible to reduce the possibility of a phenomenon occurring in which the pump unit sucks up lubricating oil containing a large amount of refrigerant, and the liquid is supplied to the sliding parts, causing malfunctions in the sliding parts. In addition, the time it takes for the liquid refrigerant introduced into the first region to reach the second region is longer than when the resistance member is not provided. This increases the time that the liquid refrigerant in the lower layer comes into contact with the high-temperature lubricating oil in the upper layer. This allows the liquid refrigerant to dissolve appropriately in the lubricating oil, cooling the lubricating oil and appropriately reducing the viscosity of the lubricating oil, thereby reducing friction loss at the sliding parts to which the liquid is supplied.

[0064] In the compressor according to the second aspect of the present disclosure, in the first aspect, the pump section has a nozzle (94) whose lower part is submerged in the liquid reservoir, and the resistance member is provided in at least a portion of the area around the nozzle.

[0065] Because the resistance member is provided in at least a portion of the periphery of the nozzle, the liquid refrigerant in the lower layer in the first region is less likely to flow into the second region than in a case where no resistance member is provided. Also, the time it takes for the liquid refrigerant introduced into the first region to reach the second region is longer than in a case where no resistance member is provided.

[0066] A compressor according to a third aspect of the present disclosure is the compressor of the second aspect, wherein the resistance member is provided over the entire range around the nozzle.

[0067] Because the resistance member is provided over the entire area around the nozzle, the liquid refrigerant in the lower layer in the first area is less likely to flow into the second area than when the resistance member is provided over only a portion of the area around the nozzle. Also, the time it takes for the liquid refrigerant introduced into the first area to reach the second area is longer than when the resistance member is provided over only a portion of the area around the nozzle.

[0068] According to a fourth aspect of the present disclosure, in the compressor of the third aspect, the resistance member is formed with a hole (97) that connects the inside and outside of the resistance member.

[0069] The resistance member has holes that connect the inside and outside of the resistance member, so even if the liquid level temporarily drops below the upper end of the resistance member, the liquid containing at least the lubricating oil can be guided from the first region to the second region, so that even if the liquid level temporarily drops below the upper end of the resistance member, the lubrication of the sliding parts is at least maintained.

[0070] In the compressor according to the fifth aspect of the present disclosure, in the second aspect, a refrigerant introduction point is provided on the peripheral wall of the housing through which refrigerant is guided into the interior of the housing, and when viewed vertically, the resistance member is provided only in the area of ​​the housing between the refrigerant introduction point and the nozzle.

[0071] When viewed vertically, the resistance member is provided only in the region between the refrigerant introduction portion of the housing and the nozzle, so that the resistance member can be provided only in the path from the first region to the second region where a relatively large amount of refrigerant flows. This allows the time it takes for the liquid refrigerant introduced into the first region to reach the second region to be extended without having to provide the resistance member over the entire area around the nozzle.

[0072] A compressor according to a sixth aspect of the present disclosure is the compressor of any one of the second to fifth aspects, wherein an upper end (96) of the resistance member is located above a lower end surface of the nozzle.

[0073] Because the upper end of the resistance member is located above the lower end surface of the nozzle, the liquid refrigerant in the lower layer in the first region is less likely to flow into the second region, which reduces the possibility of the pump section sucking up lubricating oil containing a large amount of refrigerant and supplying the liquid to the sliding section, causing malfunctions in the sliding section.

[0074] A compressor according to a seventh aspect of the present disclosure is the compressor of any one of the first to sixth aspects, wherein the resistance member is a mesh member.

[0075] The resistance member is a mesh member, which allows the liquid refrigerant to dissolve easily into the lubricating oil as it passes through the resistance member (mesh). This cools the lubricating oil and reduces the viscosity of the lubricating oil, reducing friction loss at the sliding parts to which the liquid is supplied. [Explanation of symbols]

[0076] 1 Scroll compressor (compressor) 10. Housing 11 Upper housing 12 Intermediate housing 12a Refrigerant introduction point 12b Upper oil return point 12c Lower oil return point 13 Lower housing 13a Bottom 20 Discharge cover 21 Outer edge 21a Refrigerant introduction point 22 Discharge port 31 Discharge pipe 32 Suction pipe 33 Injection tube 34 Oil return pipe 52 Reed valve 53 Retainer 60 Compression mechanism 61 Fixed Scroll 62 Fixed side end plate 62a Fixed part 62b Discharge port 63 Fixed side wall body 65 Swivel Scroll 66 Swivel side end plate 66a Bearing boss 67 Swivel side wall 70 Drive shaft 70a Oil supply passage 71 Main shaft part 72 Crankshaft 75 Electric Motor 75a rotor 75b Stator 80 Support material 81 Journal bearing part 82 Thrust plate 83 Oil return flow path 85 Drive bush 86 Counterweight 87 Journal bearing 91 Lower bearing 93 Pump section 94 nozzles 94a Intake port 95 Resistance Members 96 Top 97 holes 98 Reservoir C1 Discharge Chamber C2 suction chamber C3 compression chamber C4 Back pressure chamber R1 1st area R2 2nd area X axis

Claims

1. a compression mechanism that compresses a refrigerant; a drive shaft extending in a vertical direction and driving the compression mechanism; a housing that accommodates the compression mechanism and the drive shaft, and has a liquid reservoir formed at its bottom into which a refrigerant and a lubricating oil having a higher temperature and a lower density than the refrigerant are introduced; a pump section provided below the drive shaft and configured to suck up the liquid stored in the liquid reservoir; a resistance member provided at the bottom of the housing and providing resistance to the flow of liquid stored in the liquid reservoir; Equipped with The liquid refrigerant and lubricant are introduced into a first region of the liquid reservoir; liquid is drawn from the second region of the reservoir by the pump portion; The resistance member is disposed between the first region and the second region. Compressor.

2. the pump unit has a nozzle whose lower portion is submerged in the liquid reservoir, The resistance member is provided in at least a portion of the area around the nozzle. The compressor according to claim 1 .

3. The resistance member is provided over the entire area around the nozzle. The compressor according to claim 2 .

4. The resistance member has a hole formed therein that communicates the inside and outside of the resistance member. The compressor according to claim 3.

5. a refrigerant introduction portion through which a refrigerant is introduced into the housing is provided on a peripheral wall of the housing; When viewed from the vertical direction, the resistance member is provided only in a region between the refrigerant introduction portion of the housing and the nozzle. The compressor according to claim 2 .

6. The upper end of the resistance member is located above the lower end surface of the nozzle. The compressor according to claim 2 .

7. The resistance member is a mesh member. The compressor according to claim 1 or 2.

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