JP2013137002A - Scroll compressor - Google Patents

Scroll compressor Download PDF

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Publication number
JP2013137002A
JP2013137002A JP2011289202A JP2011289202A JP2013137002A JP 2013137002 A JP2013137002 A JP 2013137002A JP 2011289202 A JP2011289202 A JP 2011289202A JP 2011289202 A JP2011289202 A JP 2011289202A JP 2013137002 A JP2013137002 A JP 2013137002A
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Japan
Prior art keywords
oil
main bearing
bearing
space
lubricating oil
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JP2011289202A
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Japanese (ja)
Inventor
Masateru Yamamoto
昌輝 山本
Yohei Nishide
洋平 西出
Kazuhiko Matsukawa
和彦 松川
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Daikin Industries Ltd
ダイキン工業株式会社
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Priority to JP2011289202A priority Critical patent/JP2013137002A/en
Publication of JP2013137002A publication Critical patent/JP2013137002A/en
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Abstract

An object of the present invention is to suppress a lubricant supplied to each bearing from flowing out of a casing together with a refrigerant so that the amount of oil rising can be reduced.
A main shaft portion (14) of a drive shaft (11) is rotatably supported by an upper main bearing (36) and a lower main bearing (37). The eccentric shaft portion (15) of the drive shaft (11) is engaged with the pin bearing (35) of the movable scroll (70). An oil supply passage (16) and an oil discharge passage (17) are formed in the drive shaft (11). The lubricating oil pumped up from the oil reservoir (21) flows through the oil supply passage (16) and is supplied to the pin bearing (35) and the upper main bearing (36). Lubricating oil after being supplied to the pin bearing (35) and the upper main bearing (36) flows through the oil drainage passage (17), and flows into the oil draining space (28) below the lower main bearing (37). Oil is drained.
[Selection] Figure 1

Description

  The present invention relates to a scroll compressor.
  Conventionally, scroll compressors are known as compressors for compressing fluid (see, for example, Patent Documents 1 and 2). This scroll compressor has a fixed scroll and a movable scroll as a compression mechanism. The movable scroll is mounted on the upper surface of the housing and is rotationally driven by a crankshaft engaged with the rear surface. The crankshaft is inserted into and fixed to the rotor of the motor, and is rotatably supported by an upper main bearing and a lower main bearing disposed above and below the motor.
  A crankshaft oil supply passage is formed in the crankshaft. The lower end of the crankshaft is connected to an oil pump, and the lubricating oil in the oil reservoir is pumped up. The pumped lubricating oil is supplied to the gap between the inner peripheral surface of each bearing and the outer peripheral surface of the crankshaft through the crankshaft oil supply passage. Lubricating oil supplied to the pin bearing and the upper main bearing is discharged into the motor lower space through the in-housing drainage passage, the oil return guide, and the oil return passage.
JP 2010-285930 A JP 2010-275901 A
  However, in the conventional scroll compressor, a part of the lubricating oil discharged from the oil discharge passage in the housing after passing through the oil supply passage of each bearing leaks into the motor upper space from the gap between the oil return guide and the housing. There was a thing. Also, part of the lubricating oil may leak into the motor upper space from the gap between the oil return guide and the motor. For this reason, there is a problem that the lubricating oil that has become mist in the upper space of the motor flows out of the casing from the discharge pipe together with the refrigerant, and the amount of oil rising increases.
  On the other hand, the lubricating oil that has passed through the oil return passage is discharged into the motor lower space between the motor and the oil separation plate. A part of the lubricating oil after being supplied to the lower main bearing is discharged into the motor lower space. Here, the lubricating oil discharged into the motor lower space and in the form of a mist flows from the motor lower space toward the motor upper space by the winding of the gas refrigerant, and flows out of the casing from the discharge pipe together with the refrigerant. There was a problem that the amount of oil rising increased.
  Further, in the conventional scroll compressor, each bearing is individually supplied with oil from the oil supply passage in the crankshaft, so that the necessary amount of circulating lubricating oil increases. For this reason, there is a problem that the amount of leakage of the lubricating oil in the gaps described above increases, and the amount of oil rising increases.
  This invention is made | formed in view of this point, The objective is to suppress that the lubricating oil supplied to each bearing flows out of a casing with a refrigerant | coolant, and makes it possible to reduce the amount of oil rising. There is.
  The present invention provides a casing (20) provided with an oil reservoir (21) for storing lubricating oil, a fixed scroll (60) accommodated in the casing (20), and meshed with the fixed scroll (60). And a scroll compressor including a movable scroll (70) for compressing the refrigerant and a drive shaft (11) that engages with the movable scroll (70) to rotate the movable scroll (70). The following solutions were taken.
That is, according to the first aspect of the present invention, the drive shaft (11) includes a main shaft portion (14) whose upper end portion and lower end portion are rotatably supported by the upper main bearing (36) and the lower main bearing (37), respectively. An eccentric shaft portion (15) engaged with a pin bearing (35) provided on the movable scroll (70) and eccentric with respect to the main shaft portion (14) on the upper end side of the main shaft portion (14). And
Lubricating oil pumped up from the oil reservoir (21) flows through the drive shaft (11) and supplies oil to the pin bearing (35) and the upper main bearing (36) ( 16) and lubricating oil after being supplied to the pin bearing (35) and the upper main bearing (36) into the oil discharge space (28) below the lower main bearing (37). An oil drainage passage (17) is formed.
  In the first invention, the main shaft portion (14) of the drive shaft (11) is rotatably supported by the upper main bearing (36) and the lower main bearing (37). The eccentric shaft portion (15) of the drive shaft (11) is engaged with the pin bearing (35) of the movable scroll (70). An oil supply passage (16) and an oil discharge passage (17) are formed in the drive shaft (11). The lubricating oil pumped up from the oil reservoir (21) flows through the oil supply passage (16) and is supplied to the pin bearing (35) and the upper main bearing (36). Lubricating oil after being supplied to the pin bearing (35) and the upper main bearing (36) flows through the oil drainage passage (17), and flows into the oil draining space (28) below the lower main bearing (37). Oil is drained.
  With such a configuration, the lubricating oil that has been supplied to the pin bearing (35) and the upper main bearing (36) is discharged into the oil discharge space (28) through the oil discharge passage (17). It is possible to prevent a part of the lubricating oil from leaking into the motor upper space and the motor lower space. As a result, the lubricating oil that leaks into the motor upper space and the lubricating oil that flows from the motor lower space toward the motor upper space due to the winding of the gas refrigerant become a mist in the motor upper space and the casing from the discharge pipe together with the refrigerant. (20) Spilling to the outside can be suppressed and the amount of oil rising can be reduced.
According to a second invention, in the first invention,
The lower main bearing (37) is arranged in the middle of the oil discharge passage (17).
  In the second invention, the lower main bearing (37) is disposed in the middle of the oil drainage passage (17). With such a configuration, the lubricating oil after being supplied to the pin bearing (35) and the upper main bearing (36) can be supplied to the lower main bearing (37) through the oil discharge passage (17). it can.
According to a third invention, in the first or second invention,
An oil seal plate (56) covering the upper part of the lower main bearing (37) is provided so that the lubricating oil supplied to the lower main bearing (37) flows toward the oil drain space (28). It is characterized by that.
  In the third invention, the upper portion of the lower main bearing (37) is covered with the oil seal plate (56). As a result, the lubricating oil supplied to the lower main bearing (37) flows toward the oil discharge space (28).
  With such a configuration, it is possible to prevent the lubricating oil supplied to the lower main bearing (37) from leaking into the motor lower space. As a result, the mist-like lubricating oil flows from the motor lower space toward the motor upper space due to the winding of the gas refrigerant, and can be prevented from flowing out of the casing (20) from the discharge pipe together with the refrigerant. Can be reduced.
According to a fourth invention, in any one of the first to third inventions,
The oil supply passage (16) and the oil discharge passage (17) are connected in series with each other,
Lubricating oil pumped up from the oil reservoir (21) flows through the oil supply passage (16) and the oil discharge passage (17), and the pin bearing (35), the upper main bearing (36), and the The lower main bearing (37) is supplied with oil in order.
  In the fourth invention, the oil supply passage (16) and the oil discharge passage (17) are connected in series with each other. The lubricating oil pumped up from the oil reservoir (21) flows through the oil supply passage (16) and the oil discharge passage (17), and is supplied with the pin bearing (35), the upper main bearing (36), and the lower main bearing (37). Are sequentially refueled.
  With such a configuration, the oil supply to the pin bearing (35), the upper main bearing (36) and the lower main bearing (37) is made up of one system constituted by the oil supply passage (16) and the oil discharge passage (17). It can be done only in the passage. Thereby, compared with the case where it supplies with oil separately with respect to each bearing, the amount of circulation of the required lubricating oil can be reduced.
According to a fifth invention, in any one of the first to fourth inventions,
An oil separation plate (57) is provided above the oil reservoir (21) to prevent the lubricating oil in the oil reservoir (21) from being rolled up by the refrigerant flowing through the casing (20). And
The oil drain space (28) is a space below the oil separation plate (57).
  In the fifth invention, an oil separation plate (57) is provided above the oil reservoir (21). The space below the oil separation plate (57) is an oil discharge space (28) in which the lubricating oil is discharged from the oil discharge passage (17).
  With this configuration, the oil drained space (28) is provided below the oil separation plate (57), so that the lubricating oil drained through the oil drain passage (17) leaks into the motor lower space. It can suppress more reliably.
  According to the present invention, the lubricating oil after being supplied to the pin bearing (35) and the upper main bearing (36) can be discharged into the oil discharge space (28) through the oil discharge passage (17). It is possible to prevent a part of the lubricating oil from leaking into the motor upper space and the motor lower space. As a result, the lubricating oil that leaks into the motor upper space and the lubricating oil that flows from the motor lower space toward the motor upper space due to the winding of the gas refrigerant become a mist in the motor upper space and the casing from the discharge pipe together with the refrigerant. (20) Spilling to the outside can be suppressed and the amount of oil rising can be reduced.
  The lower main bearing (37) is provided in the middle of the oil drainage passage (17), and the oil supply passage (16) and the oil drainage passage (17) are connected in series, so that the pin bearing (35) and the upper main bearing Oil supply to (36) and the lower main bearing (37) can be performed by only one system passage constituted by the oil supply passage (16) and the oil discharge passage (17). Thereby, compared with the case where it supplies with oil separately with respect to each bearing, the amount of circulation of the required lubricating oil can be reduced.
It is a longitudinal section showing the composition of the scroll compressor concerning the embodiment of the present invention. It is a longitudinal cross-sectional view which shows the structure of the scroll compressor which concerns on this modification 1. It is a longitudinal cross-sectional view which shows the structure of the scroll compressor which concerns on this modification 2. It is a longitudinal cross-sectional view which shows the structure of the scroll compressor which concerns on this modification 3. It is a longitudinal cross-sectional view which shows the structure of the scroll compressor which concerns on this modification 4. It is a longitudinal cross-sectional view which shows the structure of the scroll compressor which concerns on this modification 5. It is a longitudinal cross-sectional view which shows the structure of the scroll compressor which concerns on this modification 6.
  Hereinafter, embodiments of the present invention will be described with reference to the drawings. It should be noted that the following description of the preferred embodiment is merely illustrative in nature and is not intended to limit the present invention, its application, or its use.
<Embodiment>
FIG. 1 is a longitudinal sectional view showing the configuration of the scroll compressor according to this embodiment. The scroll compressor (10) of this embodiment is provided in a refrigerant circuit of a vapor compression refrigeration cycle, and compresses a refrigerant that is a fluid.
  As shown in FIG. 1, the scroll compressor (10) includes a casing (20), an electric motor (30) accommodated in the casing (20), and a compression mechanism (40). The casing (20) is formed in a vertically long cylindrical shape and is configured in a sealed dome shape.
  The electric motor (30) includes a stator (31) fixed to the inner peripheral surface of the casing (20), and a rotor (32) disposed inside the stator (31). On the outer peripheral surface of the stator (31), a core cut part (31a) extending in the axial direction is formed by cutting a part thereof. The rotor (32) is fixed to the drive shaft (11) through the drive shaft (11). In the casing (20), a motor upper space (26) between an upper housing (50) to be described later and a motor lower space (27) between a lower housing (55) to be described later by an electric motor (30). It is divided into.
  The bottom of the casing (20) constitutes an oil reservoir (21) in which lubricating oil is stored. A suction pipe (12) is inserted through the upper part of the casing (20) and connected to the compression mechanism (40), while a discharge pipe (13) is connected to the center of the side of the casing (20). To the motor upper space (26).
  In the casing (20), an upper housing (50) is fixed above the electric motor (30), and a lower housing (55) is fixed below the electric motor (30). A compression mechanism (40) is provided above the upper housing (50). The suction port of the discharge pipe (13) is disposed between the electric motor (30) and the upper housing (50).
  The drive shaft (11) includes a main shaft portion (14) arranged vertically along the casing (20), and an eccentric shaft portion eccentric to the main shaft portion (14) on the upper end side of the main shaft portion (14) ( 15) having. The upper end portion of the main shaft portion (14) is rotatably supported by the upper main bearing (36) of the upper housing (50). The lower end portion of the main shaft portion (14) is rotatably supported by the lower main bearing (37) of the lower housing (55). The eccentric shaft portion (15) is engaged with a pin bearing (35) provided on a movable scroll (70) of the compression mechanism (40) described later. The pin bearing (35) and the upper main bearing (36) are composed of metal bearings. The lower main bearing (37) is a ball bearing.
  The compression mechanism (40) includes a fixed scroll (60) fixed to the upper surface of the upper housing (50), and a movable scroll (70) meshing with the fixed scroll (60). The movable scroll (70) is disposed between the fixed scroll (60) and the upper housing (50), and is placed on the upper housing (50).
  The upper housing (50) has an annular part (52) formed on the outer peripheral part and a concave part (53) formed on the upper part of the central part so that the central part is recessed. Moreover, a cylindrical convex part (51) is formed in the lower part of the center part of the annular part (52), and the upper main bearing (36) is fitted into the cylindrical convex part (51).
  A balance weight (18) is attached to the drive shaft (11) and is accommodated in the recess (53) of the upper housing (50). The balance weight (18) is for correcting rotational unbalance of the drive shaft (11).
  The upper housing (50) is press-fitted and fixed to the casing (20), and the inner peripheral surface of the casing (20) and the outer peripheral surface of the annular portion (52) of the upper housing (50) are hermetically sealed over the entire circumference. doing.
  The fixed scroll (60) includes an end plate (61), a cylindrical outer peripheral wall (63) standing on the outer edge of the front surface (lower surface in FIG. 1) of the end plate (61), and an outer peripheral wall (63 ) And a spiral (involute) wrap (62). The end plate (61) is located on the outer peripheral side and is formed continuously with the wrap (62). The front end surface of the wrap (62) and the front end surface of the outer peripheral wall (63) are substantially flush. The fixed scroll (60) is fixed to the upper housing (50).
  The movable scroll (70) includes a mirror plate (71), a spiral (involute) wrap (72) formed on the front surface (upper surface in FIG. 1) of the mirror plate (71), and the center of the rear surface of the mirror plate (71). And a boss portion (73) formed on the surface. And the pin bearing (35) is engage | inserted by the boss | hub part (73). An eccentric shaft portion (15) of the drive shaft (11) is inserted into the pin bearing (35), and the drive shaft (11) is engaged therewith.
  The movable scroll (70) is arranged such that the wrap (72) meshes with the wrap (62) of the fixed scroll (60). A compression chamber (41) is formed between contact portions between the wrap (62) of the fixed scroll (60) and the wrap (72) of the movable scroll (70).
  A suction port (not shown) is formed in the outer peripheral wall (63) of the fixed scroll (60), and the downstream end of the suction pipe (12) is connected to the suction port.
  A discharge port (65) is formed at the center of the end plate (61) of the fixed scroll (60). A high pressure chamber (66) in which the discharge port (65) is opened is formed on the back surface (upper surface in FIG. 1) of the end plate (61) of the fixed scroll (60). Although not shown, the high-pressure chamber (66) communicates with the motor upper space (26) through a passage formed in the end plate (61) of the fixed scroll (60) and the upper housing (50), and the compression mechanism (40) The high-pressure refrigerant compressed in (3) flows into the motor upper space (26), and the motor upper space (26) is at a high pressure.
  The concave portion (53) of the upper housing (50) communicates with the oil supply passage (16) of the drive shaft (11) through the inside of the boss portion (73) of the movable scroll (70). That is, a high pressure corresponding to the discharge pressure of the compression mechanism (40) acts in the recess (53), and the movable scroll (70) is pressed against the fixed scroll (60) with this high pressure.
  The upper housing (50) is provided with an Oldham coupling (42) as a rotation preventing member for the movable scroll (70). The Oldham coupling (42) is provided on the upper surface of the annular portion (52) of the upper housing (50), and is slidably fitted into the end plate (71) of the movable scroll (70) and the upper housing (50).
  An oil supply passage (16) and an oil discharge passage (17) extending in the vertical direction are formed inside the drive shaft (11). The lower end portion of the drive shaft (11) is connected to the oil pump (25). The oil supply passage (16) penetrates the drive shaft (11) in the vertical direction. The lubricating oil pumped up from the oil reservoir (21) by the oil pump (25) flows through the oil supply passageway (16). That is, the pumped-up lubricating oil flows out from the upper end opening of the drive shaft (11) through the oil supply passage (16), and the sliding surface between the pin bearing (35) and the eccentric shaft portion (15) and the upper main Oil is supplied to the sliding surfaces of the bearing (36) and the main shaft (14). The lubricating oil after being supplied to the pin bearing (35) and the upper main bearing (36) flows down below the upper main bearing (36).
  Here, a through hole (17a) that penetrates in the radial direction of the drive shaft (11) and communicates with the lower portion of the upper main bearing (36) is formed at the upper end of the oil discharge passage (17). That is, the lubricating oil that has been supplied to the upper main bearing (36) flows into the oil discharge passage (17) through the through hole (17a). An oil supply hole (22) opened in the radial direction of the drive shaft (11) is formed in the lower portion of the oil discharge passage (17) in the drive shaft (11).
  The lower main bearing (37) is disposed below the oil supply hole (22). The lubricating oil that has flowed out of the oil supply hole (22) of the oil discharge passage (17) is supplied to the lower main bearing (37). Here, the upper part of the lower main bearing (37) is covered with an oil seal plate (56). The oil seal plate (56) is attached to the upper part of the lower housing (55), and suppresses the lubricating oil that has been supplied to the lower main bearing (37) from leaking into the motor lower space (27). As a result, the mist-like lubricating oil flows from the motor lower space (27) toward the motor upper space (26) due to the winding of the gas refrigerant, and flows out of the casing (20) from the discharge pipe (13) together with the refrigerant. Can be suppressed, and the amount of oil rising can be reduced.
  An oil separation plate (57) is attached to the lower housing (55). The oil separation plate (57) is disposed below the lower main bearing (37) and above the oil reservoir (21), and the lubricating oil in the oil reservoir (21) is wound up by the flow of the refrigerant gas. Is prevented. In addition, the lubricant circulating in the casing (20) collides to separate the lubricating oil contained in the coolant from the coolant. The separated lubricating oil falls into the oil reservoir (21).
  A gap (23) is provided below the lower main bearing (37) in the lower housing (55) between the lower outer peripheral surface of the main shaft portion (14). An oil drain hole (24) penetrating in the radial direction is formed below the oil separation plate (57) in the lower housing (55). The gap (23) and the oil drain hole (24) constitute a part of the oil drain passage (17).
  Here, the space below the oil separation plate (57) is an oil discharge space (28) for discharging the lubricating oil that has passed through the oil discharge passage (17). In the example shown in FIG. 1, since the oil drain hole (24) of the lower housing (55) is immersed in the oil reservoir (21), the lubricating oil passing through the oil drain passage (17) is discharged into the oil drain space (28 ) Is drained into the oil reservoir (21). With such a configuration, it is possible to prevent the lubricating oil discharged through the oil discharge passage (17) from leaking into the motor lower space (27). The oil drain hole (24) may be opened between the oil separation plate (57) and the oil surface of the oil reservoir (21).
  Thus, the oil supply passage (16) and the oil discharge passage (17) are connected in series with each other, and the lubricating oil pumped up from the oil reservoir (21) is supplied to the oil supply passage (16) and the oil discharge passage (17 ) And is supplied to the pin bearing (35), the upper main bearing (36) and the lower main bearing (37) in this order.
-Driving action-
Next, the compression operation of the scroll compressor (10) will be described. When the electric motor (30) is operated, the movable scroll (70) of the compression mechanism (40) is rotationally driven. Since the movable scroll (70) is prevented from rotating by the Oldham coupling (42), the movable scroll (70) performs only eccentric rotation about the axis of the drive shaft (11). As the movable scroll (70) rotates eccentrically, the volume of the compression chamber (41) contracts toward the center, and the compression chamber (41) compresses the gas refrigerant sucked from the suction pipe (12). The compressed gas refrigerant is discharged to the high-pressure chamber (66) through the discharge port (65) of the fixed scroll (60). The high-pressure gas refrigerant in the high-pressure chamber (66) flows into the motor upper space (26) through the passages of the fixed scroll (60) and the upper housing (50). The refrigerant in the motor upper space (26) is discharged to the outside of the casing (20) through the discharge pipe (13).
  Here, a part of the gas refrigerant flows toward the motor lower space (27) through the core cut portion (31a) formed on the outer peripheral surface of the stator (31) of the electric motor (30). The mist-like lubricating oil contained in the gas refrigerant flowing in the motor lower space (27) is separated from the gas refrigerant by colliding with the oil separation plate (57). The separated lubricating oil falls toward the oil reservoir (21). The gas refrigerant from which the mist-like lubricating oil has been separated flows through another core cut (31a) of the stator (31) of the electric motor (30) toward the motor upper space (26), and is discharged to the discharge pipe (13 ) Through the casing (20).
  The motor upper space (26) of the casing (20) is maintained in the pressure state of the high-pressure refrigerant that is discharged, and the lubricating oil in the oil reservoir (21) is also maintained in the high-pressure state. The high-pressure lubricating oil in the oil reservoir (21) flows from the lower end of the oil supply passage (16) of the drive shaft (11) toward the upper end, and flows out from the upper end opening of the eccentric shaft portion (15) of the drive shaft (11). Then, oil is supplied to the sliding surface between the eccentric shaft portion (15) of the drive shaft (11) and the pin bearing (35). The lubricating oil supplied to the pin bearing (35) flows into the recess (53) of the upper housing (50). Thereby, the inside of the recess (53) becomes a high pressure corresponding to the discharge pressure. The movable scroll (70) is pressed against the fixed scroll (60) by this high pressure.
  The lubricating oil that has flowed into the recess (53) of the upper housing (50) is supplied to the sliding surfaces of the main shaft portion (14) of the drive shaft (11) and the upper main bearing (36). The lubricating oil after being supplied to the upper main bearing (36) flows into the oil discharge passage (17).
  The lubricating oil that has flowed down through the oil discharge passage (17) flows out of the oil supply hole (22) and is supplied to the lower main bearing (37). The lubricating oil that has been supplied to the lower main bearing (37) passes through the gap (23) and the oil discharge hole (24), is discharged into the oil discharge space (28), and is stored in the oil reservoir (21). .
-Effect of the embodiment-
As described above, according to the scroll compressor (10) according to the present embodiment, the oil is supplied from the oil supply passage (16) of the drive shaft (11) to the pin bearing (35) and the upper main bearing (36). Lubricating oil can be drained into the draining space (28) through the draining passage (17), and part of the lubricating oil leaks into the motor upper space (26) and motor lower space (27). Can be suppressed. As a result, the lubricating oil that has leaked into the motor upper space (26) and the lubricating oil that has flowed from the motor lower space (27) toward the motor upper space (26) due to the winding up of the gas refrigerant are removed from the motor upper space (26). Therefore, it is possible to suppress the mist from flowing out of the casing (20) to the outside of the casing (20) together with the gas refrigerant, and the amount of oil rising can be reduced.
  The lower main bearing (37) is provided in the middle of the oil drainage passage (17), and the oil supply passage (16) and the oil drainage passage (17) are connected in series, so that the pin bearing (35) and the upper main bearing Oil supply to (36) and the lower main bearing (37) can be performed by only one system passage constituted by the oil supply passage (16) and the oil discharge passage (17). Thereby, compared with the case where it supplies with oil separately with respect to each bearing, the amount of circulation of the required lubricating oil can be reduced.
<< Modification 1 >>
FIG. 2 is a longitudinal sectional view showing the configuration of the scroll compressor according to the first modification. Hereinafter, the same parts as those in the embodiment are denoted by the same reference numerals, and only differences will be described. As shown in FIG. 2, in the middle of the oil supply passage (16), there is an oil supply hole (22) that penetrates in the radial direction of the drive shaft (11) and communicates with the central portion in the axial direction of the upper main bearing (36). Is formed. That is, the lubricating oil pumped up from the oil reservoir (21) by the oil pump (25) passes through the oil supply passage (16) and is connected to the upper main bearing (36) and the main shaft (14) from the oil supply hole (22). Oil is supplied to the sliding surface.
  In addition, a communication path (51a) extending in the axial direction is formed in a part of the press-fitting surface of the upper main bearing (36) in the cylindrical convex portion (51) of the upper housing (50). That is, the lubricating oil flowing out from the upper end opening of the drive shaft (11) through the oil supply passage (16) and supplied to the sliding surfaces of the pin bearing (35) and the eccentric shaft portion (15) is connected to the communication passage ( 51a) flows down and joins the lubricating oil supplied to the upper main bearing (36). The lubricating oil that has been supplied to the pin bearing (35) and the upper main bearing (36) flows into the oil discharge passage (17) and is discharged into the oil discharge space (28).
<< Modification 2 >>
FIG. 3 is a longitudinal sectional view showing the configuration of the scroll compressor according to the second modification. As shown in FIG. 3, in the middle of the oil supply passage (16), there is an oil supply hole (22) that penetrates in the radial direction of the drive shaft (11) and communicates with the central portion in the axial direction of the upper main bearing (36). Is formed. That is, the lubricating oil pumped up from the oil reservoir (21) by the oil pump (25) passes through the oil supply passage (16) and is connected to the upper main bearing (36) and the main shaft (14) from the oil supply hole (22). Oil is supplied to the sliding surface.
  An upper through hole (17a) that penetrates in the radial direction of the drive shaft (11) and communicates with the upper main bearing (36) is formed at the upper end of the oil discharge passage (17). A lower through hole (17a) that penetrates in the radial direction of the drive shaft (11) and communicates with the lower portion of the upper main bearing (36) is formed in the middle of the oil drainage passage (17). . That is, the lubricating oil supplied to the pin bearing (35) flows into the oil drainage passage (17) through the upper through hole (17a) of the oil drainage passage (17), while the upper main bearing (36 ) Is supplied to the oil discharge passage (17) through the lower through hole (17a) and discharged into the oil discharge space (28).
<< Modification 3 >>
FIG. 4 is a longitudinal sectional view showing the configuration of the scroll compressor according to the third modification. As shown in FIG. 4, in the middle of the oil supply passage (16), there is an oil supply hole (22) that penetrates in the radial direction of the drive shaft (11) and communicates with the central portion in the axial direction of the upper main bearing (36). Is formed. In addition, a communication path (51a) extending in the axial direction is formed in a part of the press-fitting surface of the upper main bearing (36) in the cylindrical convex portion (51) of the upper housing (50). That is, the lubricating oil pumped up from the oil reservoir (21) by the oil pump (25) passes through the oil supply passage (16) and is connected to the upper main bearing (36) and the main shaft (14) from the oil supply hole (22). Oil is supplied to the sliding surface and flows through the communication path (51a) toward the recess (53) of the upper housing (50).
  A through hole (17a) that penetrates in the radial direction of the drive shaft (11) and communicates with the upper main bearing (36) is formed in the upper end portion of the oil discharge passage (17). That is, the lubricating oil after flowing out from the upper end opening of the drive shaft (11) through the oil supply passage (16) and supplied to the sliding surfaces of the pin bearing (35) and the eccentric shaft portion (15), and the upper part The lubricating oil that has been supplied to the sliding surfaces of the main bearing (36) and the main shaft portion (14) flows into the oil discharge passage (17) through the through hole (17a), and flows into the oil discharge space (28 ) Is drained.
<< Modification 4 >>
FIG. 5 is a longitudinal sectional view showing the configuration of the scroll compressor according to the fourth modification. As shown in FIG. 5, the lower end portion of the main shaft portion (14) of the drive shaft (11) is rotatably supported by the lower main bearing (37) of the lower housing (55). The lower main bearing (37) is a metal bearing.
  An oil supply hole (22) opened in the radial direction of the drive shaft (11) is formed in the lower portion of the oil discharge passage (17) in the drive shaft (11). The lower main bearing (37) is disposed below the oil supply hole (22). That is, the lubricating oil flowing out from the oil supply hole (22) of the oil discharge passage (17) is supplied to the lower main bearing (37). The lubricating oil that has been supplied to the lower main bearing (37) passes through the gap (23) and the oil discharge hole (24), is discharged into the oil discharge space (28), and is stored in the oil reservoir (21). .
<< Modification 5 >>
FIG. 6 is a longitudinal sectional view showing the configuration of the scroll compressor according to the fifth modification. As shown in FIG. 6, the lower end portion of the main shaft portion (14) of the drive shaft (11) is rotatably supported by the lower main bearing (37) of the lower housing (55). The lower main bearing (37) is a metal bearing.
  An oil supply hole (22) that penetrates in the radial direction of the drive shaft (11) and communicates with the axial center of the lower main bearing (37) is formed in the lower portion of the oil discharge passage (17) of the drive shaft (11). Has been. The lower housing (55) is formed with a communication path (55a) that extends in the axial direction and communicates with the space below the oil seal plate (56) and the gap (23). That is, the lubricating oil flowing out from the oil supply hole (22) of the oil discharge passage (17) is supplied to the lower main bearing (37). A part of the lubricating oil passes through the gap (23) and the oil drain hole (24), is drained into the oil drain space (28), and is stored in the oil reservoir (21). The remaining lubricating oil flows toward the space below the oil seal plate (56), flows down to the gap (23) through the communication path (51a), and is stored in the oil reservoir (21).
<< Modification 6 >>
FIG. 7 is a longitudinal sectional view showing the configuration of the scroll compressor according to the sixth modification. As shown in FIG. 7, the lower end portion of the main shaft portion (14) of the drive shaft (11) is rotatably supported by the lower main bearing (37) of the lower housing (55). The lower main bearing (37) is a metal bearing.
  An oil supply hole (22) that penetrates in the radial direction of the drive shaft (11) and communicates with the axial center of the lower main bearing (37) is formed in the lower portion of the oil discharge passage (17) of the drive shaft (11). Has been. The lower housing (55) is formed with a communication path (55a) that extends in the axial direction and communicates with the space below the oil seal plate (56) and the gap (23). That is, the lubricating oil flowing out from the oil supply hole (22) of the oil discharge passage (17) is supplied to the lower main bearing (37). A part of the lubricating oil passes through the gap (23) and the oil drain hole (24), is drained into the oil drain space (28), and is stored in the oil reservoir (21). The remaining lubricating oil flows toward the space below the oil seal plate (56), flows down to the gap (23) through the communication path (51a), and is stored in the oil reservoir (21).
  A through hole (17a) that penetrates in the radial direction of the drive shaft (11) and communicates with the gap (23) is formed at the lower end of the oil discharge passage (17). That is, a part of the lubricating oil flowing through the oil discharge passage (17) is discharged from the through hole (17a) to the oil discharge space (28) through the gap (23) and the oil discharge hole (24). Accumulated in the reservoir (21).
<< Other Embodiments >>
About this embodiment, it is good also as the following structures.
  D-shaped notches as viewed from the axial direction are formed on the sliding surface of the eccentric shaft portion (15) with the pin bearing (35) and the sliding surface of the main shaft portion (14) with the upper main bearing (36). It may be formed. With such a configuration, the lubricating oil supplied from the oil supply passage (16) is likely to accumulate in the notch, and the sliding surfaces of the pin bearing (35) and the upper main bearing (36) are sufficiently lubricated. be able to.
  As described above, the present invention suppresses the lubricating oil supplied to each bearing from flowing out of the casing together with the refrigerant, so that a highly practical effect of reducing the amount of oil rising can be obtained. It is extremely useful and has high industrial applicability.
10 Scroll compressor
11 Drive shaft
14 Spindle part
15 Eccentric shaft
16 Oil supply passage
17 Oil drain passage
20 casing
21 Oil reservoir
28 Oil drain space
35 pin bearing
36 Upper main bearing
37 Lower main bearing
56 Oil seal plate
57 Oil separator
60 Fixed scroll
70 Moveable scroll

Claims (5)

  1. A casing (20) provided with an oil reservoir (21) for storing lubricating oil, a fixed scroll (60) accommodated in the casing (20), and meshed with the fixed scroll (60) A scroll compressor comprising a movable scroll (70) to be compressed, and a drive shaft (11) that engages with the movable scroll (70) and rotationally drives the movable scroll (70),
    The drive shaft (11) is provided on a main shaft portion (14) whose upper end portion and lower end portion are rotatably supported by an upper main bearing (36) and a lower main bearing (37), respectively, and the movable scroll (70). An eccentric shaft portion (15) that is engaged with the pin bearing (35) and is eccentric with respect to the main shaft portion (14) on the upper end side of the main shaft portion (14),
    Lubricating oil pumped up from the oil reservoir (21) flows through the drive shaft (11) and supplies oil to the pin bearing (35) and the upper main bearing (36) ( 16) and lubricating oil after being supplied to the pin bearing (35) and the upper main bearing (36) into the oil discharge space (28) below the lower main bearing (37). A scroll compressor characterized in that an oil discharge passage (17) is formed.
  2. In claim 1,
    The scroll compressor according to claim 1, wherein the lower main bearing (37) is disposed in the middle of the oil discharge passage (17).
  3. In claim 1 or 2,
    An oil seal plate (56) covering the upper part of the lower main bearing (37) is provided so that the lubricating oil supplied to the lower main bearing (37) flows toward the oil drain space (28). A scroll compressor characterized by that.
  4. In any one of claims 1 to 3,
    The oil supply passage (16) and the oil discharge passage (17) are connected in series with each other,
    Lubricating oil pumped up from the oil reservoir (21) flows through the oil supply passage (16) and the oil discharge passage (17), and the pin bearing (35), the upper main bearing (36), and the A scroll compressor, wherein the lower main bearing (37) is supplied with oil in order.
  5. In any one of claims 1 to 4,
    An oil separation plate (57) is provided above the oil reservoir (21) to prevent the lubricating oil in the oil reservoir (21) from being rolled up by the refrigerant flowing through the casing (20). And
    The scroll compressor according to claim 1, wherein the oil discharge space (28) is a space below the oil separation plate (57).
JP2011289202A 2011-12-28 2011-12-28 Scroll compressor Pending JP2013137002A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2011289202A JP2013137002A (en) 2011-12-28 2011-12-28 Scroll compressor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2011289202A JP2013137002A (en) 2011-12-28 2011-12-28 Scroll compressor

Publications (1)

Publication Number Publication Date
JP2013137002A true JP2013137002A (en) 2013-07-11

Family

ID=48912903

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2011289202A Pending JP2013137002A (en) 2011-12-28 2011-12-28 Scroll compressor

Country Status (1)

Country Link
JP (1) JP2013137002A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015022869A1 (en) * 2013-08-12 2015-02-19 ダイキン工業株式会社 Scroll compressor
WO2016093361A1 (en) * 2014-12-12 2016-06-16 ダイキン工業株式会社 Compressor
WO2017145281A1 (en) * 2016-02-24 2017-08-31 三菱電機株式会社 Scroll compressor

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015022869A1 (en) * 2013-08-12 2015-02-19 ダイキン工業株式会社 Scroll compressor
WO2016093361A1 (en) * 2014-12-12 2016-06-16 ダイキン工業株式会社 Compressor
JP2016114060A (en) * 2014-12-12 2016-06-23 ダイキン工業株式会社 Compressor
JP2017020512A (en) * 2014-12-12 2017-01-26 ダイキン工業株式会社 Compressor
CN107002675A (en) * 2014-12-12 2017-08-01 大金工业株式会社 Compressor
CN107002675B (en) * 2014-12-12 2018-06-22 大金工业株式会社 Compressor
US10294942B2 (en) 2014-12-12 2019-05-21 Daikin Industries, Ltd. Compressor
WO2017145281A1 (en) * 2016-02-24 2017-08-31 三菱電機株式会社 Scroll compressor

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