compressor

Abstract

Provided is a scroll compressor (1) comprising a housing (10), a compression mechanism, a rotating shaft, a drive unit that transmits driving force to the rotating shaft, a sliding part (SP) that slidably connects the upper end of the rotating shaft and the compression mechanism, a pump part that suctions lubricating oil and supplies the lubricating oil to the sliding part (SP) via an oil supply flow path (70a) formed inside the rotating shaft, and a support part (80) that supports the compression mechanism. The support part (80) has a sliding space (88) in which the sliding part (SP) is disposed, and a discharge hole (83) via which the lubricating oil is guided from an inflow port (83a) to an outflow port (83b) that opens to an outer peripheral surface (80a) of the support part (80) and via which the lubricating oil is discharged to the outside of the support part (80). In a plane that is perpendicular to an axis (X) and passes through the center (83a1) of the inflow port (83a), a straight line (Y1) that passes through the center (83a1) of the inflow port (83a) and coincides with the direction (DR1) in which the discharge hole (83) in the inflow port (83a) extends is set apart from the axis (X) by a prescribed distance (L).

Description

Compressor

[0001] The present disclosure relates to a compressor.

[0002] Conventionally, there has been known a scroll compressor including a rotating shaft, an oil supply hole drilled in the rotating shaft through which oil is drawn up as the rotating shaft rotates, an oil sump chamber that collects the oil drawn up through the oil supply hole, and a discharge hole that opens into the oil sump chamber and discharges the oil collected in the oil sump chamber (see, for example, Patent Document 1). The scroll compressor disclosed in Patent Document 1 has an oil drain hole in a frame that supports a scroll compression mechanism, which guides oil from the oil sump chamber to the outside of the frame, and a cover that partially blocks the inlet opening of the oil drain hole to slow down the oil discharge rate, thereby preventing the oil discharged from the oil drain hole from scattering and reducing the amount of oil mixed into the refrigerant gas.

[0003] Japanese Patent Application Laid-Open No. 2001-73949

[0004] In the scroll compressor disclosed in Patent Document 1, the angular velocity of the oil stored in the oil sump chamber increases along the rotational direction as the rotational speed of the rotating shaft increases. However, because the oil drain hole is formed to extend radially relative to the central axis of the rotating shaft, the oil whose angular velocity along the rotational direction has increased is difficult to guide to the oil drain hole extending in a direction perpendicular to the rotational direction, and an appropriate amount of oil cannot be guided from the oil drain hole to the outside of the frame.

[0005] The present disclosure has been made in consideration of the above circumstances, and aims to provide a compressor that can appropriately increase the amount of lubricating oil supplied to the sliding section that returns to the pump section when the rotational speed of the rotating shaft that rotates the compression mechanism increases.

[0006] In order to solve the above problems, the compressor of the present disclosure employs the following means. That is, a compressor according to one aspect of the present disclosure includes a sealed housing to which a refrigerant is supplied, a compression mechanism that compresses the refrigerant supplied to the housing, a rotary shaft that rotates about an axis extending in a vertical direction, a drive unit that transmits a drive force to the rotary shaft for rotation about the axis, a sliding unit that slidably connects an upper end of the rotary shaft and the compression mechanism, a pump unit that is disposed at a lower end of the rotary shaft and sucks lubricating oil stored in a bottom portion of the housing and supplies the lubricating oil to the sliding unit through an oil supply passage formed inside the rotary shaft, and and a support part that is fixed to the housing and supports the compression mechanism, the support part having a sliding space that is cylindrically formed around the axis on which the sliding part is arranged, and a discharge hole that guides lubricating oil from an inlet that opens into the sliding space to an outlet that opens on the outer peripheral surface of the support part and discharges it to the outside of the support part, and in a plane that is perpendicular to the axis and passes through the center of the inlet, a straight line that passes through the center of the inlet and coincides with the direction in which the discharge hole at the inlet extends is spaced a predetermined distance from the axis.

[0007] According to the present disclosure, it is possible to provide a compressor that can appropriately increase the amount of lubricating oil supplied to the sliding part that returns to the pump part when the rotational speed of the rotating shaft that rotates the compression mechanism increases.

[0008] Fig. 1 is a longitudinal sectional view of a scroll compressor according to an embodiment of the present disclosure. Fig. 2 is a partially enlarged view of the vicinity of a sliding portion of the scroll compressor shown in Fig. 1. Fig. 3 is a sectional view taken along the arrows A-A of the scroll compressor shown in Fig. 2. Fig. 4 is a sectional view showing a first modified example of the scroll compressor shown in Fig. 3. Fig. 5 is a sectional view showing a second modified example of the scroll compressor shown in Fig. 3. Fig. 6 is a sectional view showing a third modified example of the scroll compressor shown in Fig. 3. Fig. 7 is a sectional view taken along the arrows B-B of the support portion shown in Fig. 3.

[0009] Hereinafter, a compressor according to an embodiment of the present disclosure will be described with reference to the drawings.

[0010] [Configuration of the Scroll Compressor] The scroll compressor 1, as an example of a compressor, is one of the devices that constitute a refrigeration cycle of, for example, an air conditioner, 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, and piping that connects these devices. The refrigeration cycle may be, for example, an injection cycle configured to introduce intermediate-pressure liquid refrigerant into the scroll compressor 1.

[0011] As shown in FIG. 1 , the scroll compressor 1 includes a housing 10 that defines an enclosed space into which a refrigerant is supplied, a discharge cover 20 that divides the enclosed space in a vertical direction VD, a compression mechanism 60 that compresses the refrigerant, a rotating shaft 70 that rotates about an axis X that extends in the vertical direction VD, an electric motor (drive unit) 75 that transmits a driving force to the rotating shaft 70 to rotate about the axis X, and a pump unit 93 that sucks up a liquid including a lubricating oil.

[0012] 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.

[0013] 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 to be 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.

[0014] The intermediate housing 12 and the lower housing 13 are connected together with the inner peripheral surface of the lower housing 13 fitted onto the outer peripheral surface of the intermediate housing 12 .

[0015] A discharge pipe 31 is provided on the top surface of the upper housing 11, connecting the discharge chamber C1 with the outside of the upper housing 11 (housing 10), 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), so that the refrigerant discharged from the discharge pipe 31 is led to the condenser.

[0016] A refrigerant inlet 12a is provided on the peripheral wall of the intermediate housing 12, connecting the interior (sealed space) of the housing 10 with the outside, and an end of a suction pipe 32 is connected to the refrigerant inlet 12a. A refrigerant pipe is connected to the other end of the suction pipe 32, and gas refrigerant evaporated in the evaporator is introduced into the suction chamber C2 via the suction pipe 32.

[0017] 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 liquid refrigerant is introduced into the suction chamber C2 via the injection pipe 33. The liquid refrigerant is, for example, a condensed portion of the gas refrigerant compressed by the scroll compressor 1.

[0018] The suction chamber C2 is provided with devices and components such as a compression mechanism 60 for compressing the refrigerant, a rotary shaft 70, an electric motor 75, and a support portion 80.

[0019] The compression mechanism 60 has a fixed scroll 61 having a spiral-shaped fixed side wall body 63 standing on a fixed side end plate 62, and an orbiting scroll 65 having a spiral-shaped orbiting side wall body 67 standing on an orbiting 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.

[0020] The fixed scroll 61 is fixed to the support part 80 via a fixing part 62a formed on the outer peripheral end part of the fixed-side end plate 62. The support part 80 is fixed to the intermediate housing 12. The support part 80 is a member to which the fixed scroll 61 is fixed, and also a member that functions as a bearing that supports the rotating shaft 70 in the radial direction, and supports the orbiting scroll 65 in the direction of the axis X.

[0021] The discharge cover 20 is disposed above the fixed scroll 61. 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 of the fixed-side end plate 62 (the surface facing the discharge cover 20). The cylindrical protrusion of the discharge cover 20 is fitted into the annular protrusion of the fixed-side end plate 62, thereby defining a back pressure chamber C4 between the discharge cover 20 and the fixed-side end plate 62.

[0022] A discharge port 62b that connects the compression chamber C3 and the back pressure chamber C4 is formed in the fixed end plate 62. A discharge port 22 that connects the back pressure chamber C4 and the discharge chamber C1 is formed in the discharge cover 20. In other words, the compression chamber C3 and the discharge chamber C1 are connected via the discharge port 62b, the back pressure chamber C4, and the discharge port 22.

[0023] 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.

[0024] 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 drawn into the compression mechanism 60. Therefore, the scroll compressor 1 of this embodiment is configured such that 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, the rotating shaft 70, and the electric motor 75 are disposed 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; for example, the fixed scroll 61 may also serve as the partition.

[0025] The orbiting scroll 65 is configured to revolve around the axis X relative to the fixed scroll 61 by means of a rotating shaft 70 and a known rotation prevention mechanism.

[0026] The rotating shaft 70 is a shaft member that extends in the vertical direction and transmits the driving force from the electric motor 75 to the orbiting scroll 65 to drive the compression mechanism 60. The rotating shaft 70 has a main shaft portion 71 whose central axis is an axis X that extends in the vertical direction, and a crank shaft portion 72 that is eccentric with respect to the axis X.

[0027] An oil supply passage 70a extending vertically is formed inside the rotating shaft 70. The lower end of the oil supply passage 70a is open and is configured to receive liquid from the pump unit 93. The upper end of the oil supply passage 70a is also open and is configured to supply liquid to a drive bush 85 and a radial bearing 87 (described later) and their vicinity (hereinafter, these will be referred to as "sliding part SP"). The sliding part SP slidably connects the upper end of the rotating shaft 70 and the compression mechanism 60.

[0028] A rotor 75a of an electric motor 75 is fitted onto the outer peripheral surface of the main shaft portion 71. Meanwhile, a stator 75b of the electric motor 75, which is paired with the rotor 75a, is fitted onto the inner peripheral surface of the intermediate housing 12. An upper portion of the main shaft portion 71 is inserted into a journal bearing portion 81 of a support portion 80 and is journal-supported in the radial direction by the journal bearing portion 81. A lower portion of the main shaft portion 71 is journal-supported in the radial direction and along 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 radial bearing and a thrust bearing for the main shaft portion 71.

[0029] A cylindrical drive bush 85 extending in the vertical direction is attached to the outer peripheral surface of the crankshaft 72. A counterweight 86 is attached to the outer peripheral surface of the drive bush 85.

[0030] A cylindrical bearing boss 66a with an open bottom end is formed in the center of the underside of the orbiting-side end plate 66. The crankshaft 72 of the rotating shaft 70 is connected to the bearing boss 66a via a drive bush 85 and a radial bearing 87. The radial bearing 87 is, for example, a needle bearing.

[0031] An annular thrust plate 82 fixed to the support portion 80 is in contact with the lower surface of the orbiting-side end plate 66. As a result, the orbiting scroll 65 is supported in a state in which it can slide relative to the support portion 80 (thrust plate 82) in a direction perpendicular to the axis X.

[0032] A pump unit 93 is provided below and below the main shaft unit 71. The pump unit 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 unit 93 is driven by the rotation of the main shaft unit 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.

[0033] The pump unit 93 has a nozzle 94, at least a lower portion of which is submerged in the liquid stored in a liquid reservoir 98. The pump unit 93 sucks up liquid from the liquid reservoir 98 through the nozzle 94 and supplies the sucked up liquid to the sliding part through the oil supply passage 70a of the rotating 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 the liquid is sucked in through this suction port 94a.

[0034] An upper oil return point 12b and a lower oil return point 12c are provided on the peripheral wall of the intermediate housing 12, connecting the interior (sealed space) of the housing 10 with the outside. The upper oil return point 12b is located higher than the lower oil return point 12c. The upper oil return point 12b and the lower oil return point 12c are connected via an oil return pipe 34 located outside the intermediate housing 12.

[0035] A horizontally extending drain hole 83 is formed in the support part 80. The drain hole 83 is a flow path that guides the liquid discharged from the sliding part SP (liquid that has lubricated the sliding part SP) to the upper oil return point 12b of the intermediate housing 12. The liquid discharged from the sliding part SP is configured to be guided back into the housing 10 (intermediate housing 12) via the drain hole 83 and the oil return pipe 34.

[0036] [Flow of Refrigerant and Lubricating Oil in the Scroll Compressor] The gas refrigerant evaporated in the evaporator is guided to the suction chamber C2 via the suction pipe 32. The gas refrigerant guided to the suction chamber C2 is taken into the compression chamber C3 of the compression mechanism 60 and is gradually compressed as it moves from the outside to the center of the compression chamber C3. The compressed gas refrigerant is guided from the compression chamber C3 to the back pressure chamber C4 via the discharge port 62b formed in the fixed side end plate 62.

[0037] The gas refrigerant guided to the back pressure chamber C4 is guided from the back pressure chamber C4 to the discharge chamber C1 via a discharge port 22 formed in the discharge cover 20. The gas refrigerant guided to the discharge chamber C1 is guided to the outside of the upper housing 11 (housing 10) via a discharge pipe 31.

[0038] The liquid refrigerant, which is a condensed portion 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.

[0039] As described above, the gas refrigerant introduced into the suction chamber C2 via the suction pipe 32 is mainly taken into the compression chamber C3, but a portion of the gas refrigerant liquefies and flows along the inner circumferential surface of the housing 10 (the middle housing 12 and the lower housing 13) and is introduced into the liquid reservoir 98 formed at the bottom of the housing 10 (the lower housing 13). Also, 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 the liquid reservoir 98 formed at the bottom of the housing 10 without vaporizing.

[0040] 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 94a of the nozzle 94. The sucked up lubricating oil is supplied to the upper part of the sliding part SP through the oil supply flow path 70a of the rotating shaft 70, and lubricates the sliding part SP. The lubricating oil that has lubricated the sliding part SP is discharged from the lower part of the sliding part SP.

[0041] The lubricating oil discharged from the sliding portion SP is guided back into the housing 10 (middle housing 12) via, for example, a discharge hole 83 formed in the support portion 80 and the oil return pipe 34. The lubricating oil guided into the housing 10 flows along the inner circumferential surface of the housing 10 and is guided to a reservoir 98 formed at the bottom of the housing 10.

[0042] The oil return pipe 34 is not a required component, and the lubricating oil discharged from the sliding part SP may be guided, for example, through a discharge hole 83 formed in the support part 80 to near the inner surface of the housing 10 (intermediate 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.

[0043] [Regarding the Discharge Hole] Next, the discharge hole 83 of the support portion 80 of this embodiment will be described with reference to Figures 2 and 3. Figure 2 is a partially enlarged view of the vicinity of the sliding portion SP of the scroll compressor 1 shown in Figure 1. Figure 3 is a cross-sectional view of the scroll compressor 1 shown in Figure 2 taken along the line A-A.

[0044] 2 and 3 , the support part 80 has a sliding space 88 and a discharge hole 83. The sliding space 88 is a space in which the sliding part SP is disposed and which is formed cylindrically around the axis X. The discharge hole 83 is a hole that guides lubricating oil from an inlet 83 a that opens into the sliding space 88 to an outlet 83 b that opens on the outer circumferential surface 80 a of the support part 80, and discharges the lubricating oil into the oil return pipe 34 outside the support part 80.

[0045] As shown in Figure 3, in a plane perpendicular to the axis X and passing through the center 83a1 of the inlet 83a, a straight line Y1 that passes through the center 83a1 of the inlet 83a and coincides with the direction DR1 in which the discharge hole 83 in the inlet 83a extends is spaced a predetermined distance L from the axis X. In the example shown in Figure 3, the predetermined distance L is set to coincide with the radius R of the sliding space 88. The cross section of the discharge hole 83 is a circle with a diameter D, and it is preferable that the predetermined distance L be set to satisfy formula (1): D ≤ L ≤ R (1)

[0046] 3, the drive bushing 85 and the counterweight 86 rotate in a counterclockwise rotational direction RD in the sliding space 88. Therefore, the lubricating oil supplied from the oil supply passage 70a to the sliding space 88 rotates in the rotational direction RD and has an angular velocity along the rotational direction RD.

[0047] 3, the direction DR1 in which the discharge hole 83 in the inlet 83a extends is the tangent direction of the sliding space 88 at the center 83a1. Therefore, the lubricating oil having an angular velocity along the rotation direction RD flows into the inlet 83a while maintaining the angular velocity. Therefore, a sufficient amount of lubricating oil can be supplied from the sliding space 88 to the discharge hole 83, and the amount of lubricating oil supplied to the sliding part SP that returns to the pump part 93 can be appropriately increased.

[0048] Fig. 4 is a cross-sectional view showing a first modified example of the scroll compressor 1 shown in Fig. 3. As shown in Fig. 4, in a plane perpendicular to the axis X and passing through the center 83a1 of the inlet 83a, a straight line Y1 that passes through the center 83a1 of the inlet 83a and coincides with the direction DR1 in which the discharge hole 83 of the inlet 83a extends is spaced a predetermined distance L from the axis X. In the example shown in Fig. 4, the predetermined distance L is set to coincide with the diameter D of the discharge hole 83.

[0049] Fig. 5 is a cross-sectional view showing a second modified example of the scroll compressor 1 shown in Fig. 3. As shown in Fig. 5, the support portion 80 of the second modified example has a plurality of discharge holes 83 arranged at intervals in the circumferential direction about the axis X. Although the support portion 80 shown in Fig. 5 has two discharge holes 83, it may have three or more discharge holes 83.

[0050] Fig. 6 is a cross-sectional view showing a third modified example of the scroll compressor 1 shown in Fig. 3. As shown in Fig. 6, the support portion 80 of the third modified example is provided with a sealing mechanism 89 that is disposed at the discharge hole 83 and that urges a valve body portion 89b by a spring (urging member) 89a in a direction from the outlet 83b toward the inlet 83a to seal the discharge hole 83. When the rotational speed of the rotating shaft 70 exceeds a predetermined speed, the sealing mechanism 89 releases the state in which the discharge hole 83 is sealed by the valve body portion 89b to a state shown by a dotted line, and guides the lubricating oil from the inlet 83a to the outlet 83b.

[0051] Fig. 7 is a cross-sectional view showing a fourth modified example of the scroll compressor 1 shown in Fig. 3. As shown in Fig. 7, in the support part 80 of the fourth modified example, the discharge hole 83 is formed in the vicinity of the outlet 83b such that the center of the discharge hole 83 is away from the straight line Y1 with respect to the axis X.

[0052] Fig. 8 is a cross-sectional view taken along the line B-B of the support part 80 shown in Fig. 3. As shown in Fig. 8, in the support part 80 of the scroll compressor 1 according to an embodiment of the present disclosure, the sliding space 88 is a space having a first height H1 in the vertical direction VD. The height H of the center 83a1 of the inlet 83a relative to the bottom surface 88a in the vertical direction VD is higher than a second height H2 that is half the first height H1.

[0053] The scroll compressor 1 of the present embodiment described above provides the following functions and effects.

[0054] According to the scroll compressor 1 of this embodiment, the discharge holes 83 guide the lubricating oil from the inlet 83a, which opens into the sliding space 88 in which the sliding part SP is disposed, to the outlet 83b, which opens into the outer peripheral surface 80a of the support part 80, and discharge the lubricating oil to the outside of the support part 80. In a plane perpendicular to the axis X and passing through the center of the inlet 83a, a straight line Y1, which passes through the center 83a1 of the inlet 83a and coincides with the direction in which the discharge holes 83 in the inlet 83a extend, is spaced a predetermined distance L from the axis X.

[0055] Therefore, when the sliding part SP rotates around the axis X in the sliding space 88, the lubricating oil has an angular velocity in the circumferential direction around the axis X, and the lubricating oil is guided to the inlet 83a of the discharge hole 83 while at least a part of that angular velocity is preserved. Therefore, a sufficient amount of lubricating oil can be supplied from the sliding space 88 to the discharge hole 83, and the amount of lubricating oil that is supplied to the sliding part SP and returns to the pump part 93 can be appropriately increased.

[0056] According to the scroll compressor 1 of this embodiment, the predetermined distance L is equal to or greater than the diameter D of the discharge hole 83, and therefore the lubricating oil can be guided to the inlet 83a of the discharge hole 83 while maintaining a greater angular velocity than when the predetermined distance L is less than D.

[0057] According to the scroll compressor 1 of this embodiment, the lubricating oil supplied to the sliding space 88 can be discharged from each of the plurality of discharge holes 83 arranged at intervals in the circumferential direction around the axis X.

[0058] According to the scroll compressor 1 of this embodiment, the height H in the vertical direction VD relative to the bottom surface 88a of the sliding space 88 at the center of the inlet 83a is higher than the second height H2, which is half the first height H1 of the sliding space 88. Therefore, when the rotation speed of the rotating shaft 70 is low, an appropriate amount of lubricating oil can be retained in the sliding space 88, and when the rotation speed of the rotating shaft 70 is high, the lubricating oil can be appropriately discharged from the discharge hole 83.

[0059] According to the scroll compressor 1 of this embodiment, an appropriate amount of lubricating oil can be retained in the sliding space 88 when the rotation speed of the rotating shaft 70 is low, and the lubricating oil can be appropriately discharged from the discharge hole 83 when the rotation speed of the rotating shaft 70 is high.

[0060] According to the scroll compressor 1 of this embodiment, the lubricating oil having a radially outward velocity component when rotating within the sliding space 88 can be smoothly guided from the inlet 83a of the discharge hole 83 to the outlet 83b without applying significant resistance.

[0061] 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 sealed housing (10) to which a refrigerant is supplied, a compression mechanism (60) that compresses the refrigerant supplied to the housing, a rotary shaft (70) that rotates about an axis (X) extending in a vertical direction, a drive unit (75) that transmits a driving force to the rotary shaft for rotation about the axis, a sliding unit (SP) that slidably connects an upper end of the rotary shaft and the compression mechanism, a pump unit (93) that is disposed at a lower end of the rotary shaft and sucks lubricating oil stored in a bottom of the housing and supplies the lubricating oil to the sliding unit through an oil supply passage (70a) formed inside the rotary shaft, and a front and a support part (80) fixed to the housing and supporting the compression mechanism, the support part having a sliding space (88) formed cylindrically around the axis on which the sliding part is arranged, and a discharge hole (83) for guiding lubricating oil from an inlet (83a) opening into the sliding space to an outlet (83b) opening on the outer peripheral surface (80a) of the support part and discharging the lubricating oil to the outside of the support part, and in a plane perpendicular to the axis and passing through the center of the inlet, a straight line (Y1) passing through the center of the inlet and coinciding with the direction in which the discharge hole at the inlet extends is spaced a predetermined distance (L) from the axis.

[0063] In the scroll compressor according to the first aspect of the present disclosure, the discharge holes guide the lubricating oil from the inlet opening into the sliding space in which the sliding part is disposed to the outlet opening on the outer peripheral surface of the support part, and the lubricating oil is then discharged to the outside of the support part. In a plane perpendicular to the axis and passing through the center of the inlet, a straight line passing through the center of the inlet and coinciding with the direction in which the discharge holes in the inlet extend is spaced a predetermined distance from the axis.

[0064] Therefore, when the sliding part rotates around the axis in the sliding space, the lubricating oil has an angular velocity in the circumferential direction around the axis, and the lubricating oil is guided to the inlet of the discharge hole while at least a portion of that angular velocity is preserved. Therefore, a sufficient amount of lubricating oil can be supplied from the sliding space to the discharge hole, and the amount of lubricating oil that is supplied to the sliding part and returns to the pump part can be appropriately increased.

[0065] A scroll compressor according to a second aspect of the present disclosure is the scroll compressor of the first aspect, further including the following configuration: the cross section of the discharge hole is circular, and the predetermined distance is equal to or greater than D and equal to or less than R, where D is the diameter of the discharge hole and R is the radius of the sliding space.

[0066] According to the scroll compressor of the second aspect of the present disclosure, since the predetermined distance is equal to or greater than D, the lubricating oil can be guided to the inlet of the discharge hole while maintaining a greater angular velocity than when the predetermined distance is less than D.

[0067] A scroll compressor according to a third aspect of the present disclosure is the scroll compressor of the first or second aspect, further including the following configuration: That is, the support portion has a plurality of the discharge holes arranged at intervals in a circumferential direction around the axis.

[0068] According to the scroll compressor according to the third aspect of the present disclosure, the lubricating oil supplied to the sliding space can be discharged from each of the plurality of discharge holes arranged at intervals in the circumferential direction around the axis.

[0069] A scroll compressor according to a fourth aspect of the present disclosure is the first or second aspect, further including the following configuration: the sliding space is a space having a first height (H1) in the vertical direction, and the height (H) in the vertical direction of the center of the inlet relative to a bottom surface (88a) of the sliding space is higher than a second height (H2) that is half the first height.

[0070] According to the scroll compressor of the fourth aspect of the present disclosure, the vertical height of the center of the inlet relative to the bottom surface of the sliding space is higher than the second height, which is half the first height. Therefore, when the rotation speed of the rotating shaft is low, an appropriate amount of lubricating oil can be retained in the sliding space, and when the rotation speed of the rotating shaft is high, the lubricating oil can be appropriately discharged from the discharge hole.

[0071] A scroll compressor according to a fifth aspect of the present disclosure is the first or second aspect, further comprising the following configuration: the support portion includes a sealing mechanism (89) that is disposed at the discharge hole and that urges a valve body portion (89b) in a direction from the outlet toward the inlet by a urging member (89a) to seal the discharge hole, and the sealing mechanism releases the state in which the discharge hole is sealed by the valve body portion when the rotational speed of the rotating shaft exceeds a predetermined speed, thereby directing lubricating oil from the inlet to the outlet.

[0072] According to the scroll compressor of the fifth aspect of the present disclosure, an appropriate amount of lubricating oil can be retained in the sliding space when the rotation speed of the rotating shaft is low, and the lubricating oil can be appropriately discharged from the discharge hole when the rotation speed of the rotating shaft is high.

[0073] A scroll compressor according to a sixth aspect of the present disclosure is the scroll compressor of the first or second aspect, further including the following configuration: That is, the discharge hole is formed such that the center of the discharge hole is away from the straight line with respect to the axis in the vicinity of the outlet.

[0074] According to the scroll compressor of the sixth aspect of the present disclosure, the lubricating oil having a radially outward velocity component that is given when rotating within the sliding space can be smoothly guided from the inlet to the outlet of the discharge hole without applying significant resistance.

[0075] REFERENCE SIGNS LIST 1 scroll compressor 10 housing 20 discharge cover 60 compression mechanism 70 rotating shaft 70a oil supply passage 75 electric motor (drive unit) 80 support portion 80a outer peripheral surface 83 discharge hole 83a inlet 83a1 center 83b outlet 85 drive bush 86 counterweight 87 radial bearing 88 sliding space 88a bottom surface 89 sealing mechanism 89b valve body portion 91 lower bearing 93 pump portion 94 nozzle 94a suction port 98 liquid reservoir C1 discharge chamber C2 suction chamber C3 compression chamber C4 back pressure chamber DR1 direction H height H1 first height H2 second height L predetermined distance R radius RD rotation direction SP sliding portion VD vertical direction X axis line

Claims

1. A compressor comprising: a sealed housing to which a refrigerant is supplied; a compression mechanism that compresses the refrigerant supplied to the housing; a rotating shaft that rotates about an axis extending in a vertical direction; a drive unit that transmits a driving force to the rotating shaft to rotate about the axis; a sliding unit that slidably connects an upper end of the rotating shaft and the compression mechanism; a pump unit that is disposed at the lower end of the rotating shaft and sucks lubricating oil stored in a bottom part of the housing and supplies it to the sliding unit through an oil supply flow path formed inside the rotating shaft; and a support unit that is fixed to the housing and supports the compression mechanism, wherein the support unit has a sliding space that is cylindrically formed about the axis in which the sliding unit is disposed, and a discharge hole that guides the lubricating oil from an inlet that opens into the sliding space to an outlet that opens on the outer circumferential surface of the support unit and discharges it to the outside of the support unit, A compressor in which, in a plane perpendicular to the axis and passing through the center of the inlet, a straight line passing through the center of the inlet and coinciding with the direction in which the discharge hole at the inlet extends is spaced a predetermined distance from the axis.

2. The compressor according to claim 1, wherein the cross section of the discharge hole is circular, and the predetermined distance is equal to or greater than D and equal to or less than R, where D is the diameter of the discharge hole and R is the radius of the sliding space.

3. A compressor according to claim 1 or claim 2, wherein the support portion has a plurality of the discharge holes arranged at intervals in the circumferential direction around the axis.

4. A compressor according to claim 1 or claim 2, wherein the sliding space is a space having a first height in the vertical direction, and the height of the center of the inlet in the vertical direction relative to the bottom surface of the sliding space is higher than a second height that is half the first height.

5. A compressor as described in claim 1 or claim 2, wherein the support portion is disposed in the discharge hole and is provided with a sealing mechanism that uses a biasing member to bias the valve body portion in a direction from the outlet toward the inlet to seal the discharge hole, and the sealing mechanism releases the state in which the discharge hole is sealed by the valve body portion when the rotational speed of the rotating shaft exceeds a predetermined speed, thereby directing lubricating oil from the inlet to the outlet.

6. A compressor according to claim 1 or claim 2, wherein the discharge hole is formed so that the center of the discharge hole in the vicinity of the outlet is away from the straight line relative to the axis.

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