JP2012207547A - Electric scroll type compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric scroll type compressor which can improve durability, related to a bearing for rotatably supporting one end of a rotating shaft.SOLUTION: In a housing 10, there are formed a suction port 46 communicating with the inside of a motor chamber 42 from the outside, and a bearing holding part 14 which holds a rolling bearing 25 and forms an oil chamber 100 between one end face 24C of the rotating shaft 24 and itself. At the rotating shaft 24, an oil supply hole 70 is formed, which comprises a first opening 71 opened at one end face 24C and facing the oil chamber 100, a second opening 72 opened toward a back pressure chamber 39 at the other end 24B, and a communication hole 73 which makes the first opening 71 and the second opening 72 communicate with each other. At a wall surface of the motor chamber 42, there is formed a guide passage 111 which can guide lubricating oil returning from the suction port 46 into the oil chamber 100. At a bearing cage 14, there is formed a partitioning wall 103 which partitions the oil chamber 100 into a return chamber 101 communicating with the guide passage 111, and an injection chamber 102 communicating with the first opening 71.

Description

  The present invention relates to an electric scroll compressor.

  Patent Document 1 discloses a conventional electric scroll compressor. The electric scroll compressor is provided in a motor chamber, a motor mechanism that is provided in the motor chamber and capable of rotating a rotating shaft, and is provided in the motor chamber and rotatably supports one end portion of the rotating shaft. And a bearing.

  The electric scroll compressor includes a fixed scroll fixed to the housing, a movable scroll that is provided in the housing so as to be able to revolve only by the other end of the rotary shaft, and forms a compression chamber between the fixed scroll and the fixed scroll. And a shaft support member which is fixed in the housing and forms a back pressure chamber with the movable scroll. In the back pressure chamber, back pressure is applied including lubricating oil.

  The housing is formed with a suction port communicating with the motor chamber from the outside and a bearing holding portion for holding the outer ring of the bearing. An oil supply hole including a first opening, a second opening, and a communication hole is formed in the rotation shaft. The first opening opens at one end of the rotating shaft in the radially outward direction of the rotating shaft and faces the inner ring of the bearing. The second opening is open to the back pressure chamber at the other end. The communication hole communicates the first opening and the second opening.

  The conventional electric scroll type compressor having the above configuration supplies the back pressure containing the lubricating oil from the back pressure chamber through the oil supply hole to the bearing, thereby supplying the amount of lubricating oil in the back pressure chamber and the bearing. The amount of lubricated oil is optimized.

JP 2010-14108 A

  By the way, with respect to the conventional electric scroll compressor, it is required to improve the durability of a bearing that rotatably supports one end portion of a rotating shaft.

  In this regard, in the conventional electric scroll compressor described above, the first opening opens at the one end portion of the rotating shaft in the radially outward direction of the rotating shaft and faces the inner ring of the bearing. For this reason, the lubricating oil discharged from the first opening via the oil supply hole is likely to scatter radially outward from the rotating shaft. Also, the lubricating oil discharged from the first opening is likely to scatter outward from the rotation shaft due to the centrifugal force accompanying the rotation of the rotation shaft. Furthermore, even when the lubricating oil returning from the outside to the motor chamber through the suction port formed in the housing approaches the bearing holding portion, the returning lubricating oil is scattered by the lubricating oil scattered radially outward from the rotating shaft. There is a case where it is moved away from the bearing. As a result, the conventional electric scroll compressor may be difficult to supply a sufficient amount of lubricating oil to the bearing, and it is difficult to improve durability.

  The present invention has been made in view of the above-described conventional situation, and relates to a bearing that rotatably supports one end portion of a rotating shaft, and solves the problem of providing an electric scroll compressor capable of realizing improved durability. It is an issue that should be done.

An electric scroll compressor according to the present invention includes a housing in which a motor chamber is formed, a motor mechanism provided in the motor chamber and capable of rotating a rotating shaft, provided in the motor chamber, and having one end portion of the rotating shaft A bearing that is rotatably supported, a fixed scroll that is fixed to the housing, and a movable member that can be revolved only by the other end of the rotary shaft in the housing and forms a compression chamber between the fixed scroll and the fixed scroll. In a scroll type compressor comprising a scroll and a shaft support member that is fixed in the housing and forms a back pressure chamber between the scroll and the movable scroll,
The housing is formed with a suction port communicating with the motor chamber from the outside, and a bearing holding portion that holds the bearing and forms an oil chamber between one end surface of the one end portion,
The rotary shaft communicates with the first opening that opens to the one end surface and faces the oil chamber, the second opening that opens to the back pressure chamber at the other end, and the first opening and the second opening. An oil supply hole composed of a communication hole to be formed is formed,
On the wall surface of the motor chamber, a guide path capable of guiding the lubricating oil returning from the suction port into the oil chamber is formed,
The bearing holding portion is formed with a partition wall that divides the oil chamber into a return chamber that communicates with the guide path and an injection chamber that communicates with the first opening. 1).

  In the electric scroll compressor of the present invention, the back pressure including the lubricating oil in the back pressure chamber is supplied to the oil chamber through the second opening, the communication hole, and the first opening that constitute the oil supply hole. The lubricating oil returning from the suction port formed in the housing to the motor chamber is guided into the oil chamber by a guide path formed on the wall surface of the motor chamber. The guide path may be any shape as long as it can guide the returning lubricating oil into the oil chamber, and may be, for example, a flat surface, a curved surface, a bent surface, a groove, or a hole.

  And the partition wall formed in the bearing holding part partitions the oil chamber into a return chamber that communicates with the guide path and an injection chamber that communicates with the first opening. Thus, in this electric scroll compressor, the lubricating oil returning from the suction port is accumulated in the return chamber and supplied to the bearing. On the other hand, the back pressure including lubricating oil in the back pressure chamber is supplied to the bearing after being injected into the injection chamber. At this time, even if the back pressure is vigorously injected from the first opening into the injection chamber, it is blocked by the partition wall, so that the lubricating oil accumulated in the return chamber is hardly scattered. As a result, this electric scroll compressor supplies a sufficient amount of lubricating oil to the bearing even if the operating conditions change greatly, for example, when the amount of lubricating oil returning from the suction port becomes extremely small. Can do.

  Therefore, the electric scroll compressor according to the present invention can improve durability with respect to a bearing that rotatably supports one end of the rotating shaft.

  When the electric scroll compressor according to the present invention is operated, it is preferable that the suction port, the guide path, the return chamber, the partition wall, and the injection chamber are located in this order from the upper side to the lower side (Claim 2). In this case, the lubricating oil returning from the suction port is easily guided by the guide path and collected in the return chamber simply by moving so as to hang downward in the vertical direction due to gravity. Further, the upper return chamber and the lower injection chamber are reliably partitioned by the partition wall. For this reason, this electric scroll compressor can produce the effect of this invention reliably.

  In the above case, it is preferable that the bearing holding portion has a boss protruding in the housing, and the guide path is a notch provided in the boss. By using the notch provided in the boss as the guide portion, the lubricating oil returning from the suction port can be reliably guided to the return chamber, and the manufacturing process for forming the guide portion can be prevented from becoming complicated.

  The bearing is preferably a rolling bearing. In the case of a rolling bearing, it is easy to guide the lubricating oil to the return chamber using the space between the outer ring and the inner ring.

  The oil supply hole preferably has a throttle portion. In this case, since the back pressure injected from the back pressure chamber into the injection chamber can be adjusted by the throttle portion, it becomes easy to optimize the amount of lubricating oil in the back pressure chamber and the amount of lubricating oil supplied to the injection chamber. The throttle part may be formed in the oil supply hole itself, or may be a gap formed between the oil supply hole and the injection chamber.

  It is preferable that the throttle portion is formed by fitting a throttle member to the communication hole. In this case, it is not necessary to directly form a drawing shape such as a stepped hole on the rotating shaft, so that the manufacturing process can be simplified.

  The fixed scroll has a fixed substrate and a fixed spiral wall integrally formed with the fixed substrate, and the movable scroll is integrated with the movable substrate facing the fixed substrate and the movable substrate, and is meshed with the fixed spiral wall. It is preferable to have a movable spiral wall. An air supply passage is preferably formed in the movable scroll. The air supply passage opens at one end surface of the movable spiral wall and communicates with an inflow port that can communicate with the compression chamber, an outflow port that is formed in the movable substrate and communicates with the back pressure chamber, and the inflow port and the outflow port. Preferably, the compression chamber is connected to the back pressure chamber by elastic deformation of the movable scroll or displacement in the revolution axis direction.

  For example, if the back pressure in the back pressure chamber is insufficient and the movable scroll cannot be sufficiently urged to the fixed scroll side at the time of starting or high load, the center side of the movable scroll is separated from the fixed scroll. Or the movable scroll itself is slightly displaced in the direction of the revolution axis. Then, the compression chamber can be communicated with the back pressure chamber as follows by the air supply passage having the above-described configuration. That is, the fixed substrate and the one end surface of the inner end portion of the movable spiral wall are separated from each other, the oil seal that sealed between the inlet and the compression chamber is broken, and the inlet and the compression chamber communicate with each other. The high-pressure refrigerant flows into the back pressure chamber through the air supply hole and the outlet. As a result, the back pressure in the back pressure chamber can be maintained moderately, and the lubricating oil can be more easily supplied to the injection chamber through the oil supply hole.

  The electric scroll compressor according to the present invention relates to a bearing that rotatably supports one end portion of a rotary shaft, and can achieve improved durability.

1 is a longitudinal sectional view of an electric scroll compressor according to a first embodiment. (A) is a principal part expanded sectional view which shows the vicinity of a bearing holding | maintenance part, (b) is the inlet and bearing seen from the arrow A direction shown to (a). It is a figure which extracts and shows a holding part. FIG. 4 is an enlarged cross-sectional view of a main part showing the vicinity of a movable scroll and a shaft support portion in the scroll compressor according to the first embodiment. FIG. 4 is a cross-sectional view showing the IV-IV cross section of FIG. 1 according to the scroll compressor of Example 1. It is a principal part expanded sectional view explaining the effect | action of an air supply path in connection with the scroll compressor of Example 1. FIG. (A) is a principal part expanded sectional view which shows the vicinity of a bearing holding | maintenance part, (b) is the inlet and bearing seen from the arrow B direction shown to (a). It is a figure which extracts and shows a holding part. (A) is a principal part expanded sectional view which shows the vicinity of a bearing holding | maintenance part, (b) is the inlet and bearing seen from the arrow C direction shown to (a). It is a figure which extracts and shows a holding part.

  Embodiments 1 to 3 embodying the present invention will be described below with reference to the drawings.

Example 1
As shown in FIG. 1, the scroll compressor according to the first embodiment includes a housing 10. The housing 10 includes a bottomed cylindrical front housing 11 whose rear end side is open, and a rear housing 12 that forms a lid and closes the rear end side of the front housing 11. In FIG. 1, the right side of the drawing is defined as the leading end side, and the left side of the drawing is defined as the trailing end side. The front end side corresponds to one end side of the present invention, and the rear end side corresponds to the other end side of the present invention. In FIG. 1, the upper side of the paper is defined as the upper side, and the lower side of the paper is defined as the lower side. FIG. 1 shows the posture of the scroll compressor according to the first embodiment during operation. Based on this attitude, the following description will be given.

  A shaft support member 15 is provided in the front housing 11, and a fixed scroll 16 is provided behind the shaft support member 15. Between the fixed scroll 16 and the shaft support member 15, an annular metal thin plate 61 is interposed. The front housing 11 and the rear housing 12 are housed in a state where the shaft support member 15, the plate 61, and the fixed scroll 16 are in contact with each other, and the rear end of the front housing 11 and the front end of the rear housing 12 are abutted with each other. The bolts 13 are mutually fixed. A motor chamber 42 is formed in the front housing 11 in front of the shaft support member 15.

  A bearing holding portion 14 is provided at the center of the inner surface of the bottom wall 11 </ b> A of the front housing 11. A suction port 46 is provided through the bottom wall 11 </ b> A of the front housing 11 above the bearing holding portion 14.

  As shown in FIG.1 and FIG.2, the bearing holding | maintenance part 14 has the boss | hub 14A which protrudes cylindrically from the inner surface center of 11 A of bottom walls. An outer ring 25A of a rolling bearing 25 which is an example of the bearing of the present invention is fitted on the inner cylindrical surface 14B of the boss 14A. A front end portion 24A of a rotary shaft 24 extending in the front-rear direction is fitted into the inner ring 25B of the rolling bearing 25. Thereby, the bearing holder 14 holds the rolling bearing 25. And the rolling bearing 25 is supporting the front-end | tip part 24A of the rotating shaft 24 rotatably.

  The bearing holding portion 14 forms an oil chamber 100 between the front end surface 24C of the front end portion 24A. The oil chamber 100 is recessed in the direction away from the tip surface 24C of the rotating shaft 24 inside the boss 14A. As shown in FIG. 2B, the oil chamber 100 has a shallow round hole shape centered on the central axis R of the rotating shaft 24. As shown in FIG. 2A, the inner diameter of the inner cylindrical surface 100B of the oil chamber 100 is smaller than the outer ring 25A of the rolling bearing 25 and larger than the inner ring 25B.

  A partition wall 103 that partitions the oil chamber 100 is formed in the bearing holding portion 14. The partition wall 103 protrudes from the position above the central axis R on the bottom surface 100 </ b> A of the oil chamber 100 so as to approach the tip surface 24 </ b> C of the rotating shaft 24. The partition wall 103 is a rib having a substantially rectangular cross section. As shown in FIG. 2B, the partition wall 103 extends in a substantially horizontal direction and is connected to the inner cylindrical surface 100 </ b> B of the oil chamber 100.

  The gap between the partition wall 103 and the tip surface 24C of the rotating shaft 24 is narrowed. The lubricating oil is interposed in the gap between the partition wall 103 and the front end surface 24C, so that an oil seal is formed between them. Thus, the partition wall 103 partitions the oil chamber 100 into an upper return chamber 101 and a lower injection chamber 102.

  As shown in FIGS. 2A and 2B, a groove-shaped guide path 111 is formed on the inner surface of the bottom wall 11 </ b> A of the front housing 11. The guide path 111 extends while being bent from below the suction port 46 to the upper surface and the rear surface of the boss 14A. A refrigerant containing lubricating oil returns from the suction port 46 located above the bearing holding portion 14 into the motor chamber 42 via an external pipe (not shown). At this time, part of the lubricating oil contained in the refrigerant hangs downward in the vertical direction from the suction port 46 due to gravity. Then, it is guided by the guide path 111, passes between the outer ring 25 </ b> A and the outer ring 25 </ b> B of the rolling bearing 25, and is guided to the return chamber 101.

  As shown in FIGS. 1 and 3, the shaft support member 15 includes a cylindrical main body portion 17 and a flange portion 18 that projects outward from the opening edge of the rear end of the main body portion 17. A shaft hole 19 is provided in the center of the main body 17. The flange 18 abuts against a step 21 formed on the inner peripheral surface of the front housing 11 and is stopped in front. On the rear surface side of the flange portion 18, a rotation prevention pin 23 </ b> A that restricts the rotation of a movable scroll 22, which will be described later, and enables only revolution, is provided protruding rearward.

  A rolling bearing 26 is held on the shaft support member 15. The rolling bearing 26 supports the rear end 24 </ b> B of the rotary shaft 24 so as to be rotatable. A sealing material 30 for sealing is provided between the shaft support member 15 and the rear end 24 </ b> B of the rotating shaft 24.

  As shown in FIG. 1, the rotation shaft 24 is provided with a communication hole 73 extending along the central axis R. As shown in FIG. 2A, the front end of the communication hole 73 is a first opening 71 that opens on the front end surface 24 </ b> C of the rotating shaft 24. The narrowed portion 121 is formed by fitting a narrow cylindrical throttle member 122 from the first opening 71 into the communication hole 73. The first opening 71 communicates with the ejection chamber 102. On the other hand, the first opening 71 does not communicate with the return chamber 101 due to the partition wall 103 and the oil seal between the distal end surface 24 </ b> C and the partition wall 103.

  As shown in FIG. 3, the rear end of the communication hole 73 is a second opening 72 that opens to the rear end 24 </ b> B of the rotary shaft 24. The first opening 71, the second opening 72, and the communication hole 73 constitute an oil supply hole 70.

  A cylindrical eccentric pin 32 protrudes from the rear end 24 </ b> B of the rotary shaft 24 at a position eccentric from the central axis R of the rotary shaft 24. A cylindrical bush 33 is fitted and supported on the eccentric pin 32. The central axis R of the rotating shaft 24 is also the revolution axis of the movable scroll 22. A balance weight 35 that extends outward in a fan shape is integrally formed on a substantially semicircular portion of the outer peripheral surface of the bush 33. The balance weight 35 plays a role of canceling a centrifugal force accompanying the revolution of the movable scroll 22 described later.

  The fixed scroll 16 includes a fixed substrate 16C having a bottomed cylindrical shape by a base wall 16A and an outer peripheral wall 16B, and a fixed spiral wall 16D that is integrally raised on the inner surface of the outer peripheral wall 16B and on the front surface of the base wall 16A. It consists of.

  On the other hand, a movable scroll 22 is provided between the bush 33 and the fixed scroll 16 via a radial bearing 34. The movable scroll 22 includes a disk-shaped movable substrate 22A that faces the fixed substrate 16C, and a movable spiral wall 22B that is raised integrally with the rear surface of the movable substrate 22A. The movable spiral wall 22B is meshed with the fixed spiral wall 16D.

  The distal end surface 16F of the fixed spiral wall 16D is slidable on the movable substrate 22A in a state where the lubricating oil contained in the refrigerant is interposed. The front end surface 22F of the movable spiral wall 22B is also slidable on the fixed substrate 16C with the lubricating oil contained in the refrigerant interposed. The outer peripheral edge of the movable substrate 22A is also slidable with the outer peripheral edge of the fixed substrate 16C with the lubricating oil contained in the refrigerant interposed. The oil film of the lubricating oil acts as an oil seal, so that between the tip surface 16F and the fixed substrate 16C, between the tip surface 22F and the movable substrate 22A, the outer peripheral edge of the movable substrate 22A, and the outer peripheral edge of the fixed substrate 16C. The gap is sealed.

  In the front surface of the movable substrate 22A, a rotation prevention hole 37 that receives the tip of the rotation prevention pin 23A in a loosely fitted state is formed in a recessed manner. A cylindrical ring 23 </ b> B is loosely fitted in the rotation prevention hole 37. The rotation preventing pin 23A slides and rolls on the inner peripheral surface of the ring 23B, so that the movable scroll 22 is restricted from rotating and can only revolve around the center axis (revolution axis) R.

  A compression chamber 38 is defined by the fixed substrate 16C, the fixed spiral wall 16D, the movable substrate 22A, and the movable spiral wall 22B. When the movable scroll 22 revolves, the compression chamber 38 is moved from the outer peripheral side to the center side of the spiral walls 16D and 22B and the volume is reduced. As a result, the refrigerant in the compression chamber 38 is compressed.

  The front surface of the movable substrate 22A is in contact with the rear surface of the plate 61 made of a thin metal plate. For this reason, the movable scroll 22 revolves while sliding on the plate 61.

  Back pressure on the front side of the movable substrate 22A (the rear side facing away from the compression chamber 38) and between the movable substrate 22A and the shaft support member 15 is exposed to the rear end 24B of the rotary shaft 24. A chamber 39 is formed. The back pressure chamber 39 communicates with the second opening 72 and the rotation prevention hole 37. A suction chamber 41 is formed between the shaft support member 15, the outer peripheral wall 16B, and the outermost peripheral part of the movable spiral wall 22B.

  As shown in FIG. 1, a stator 44 is fixed to the inner peripheral surface of the front housing 11 in the motor chamber 42. A rotor 45 fixed to the rotating shaft 24 is provided inside the stator 44. The rotor 45, the stator 44, and the rotating shaft 24 constitute a motor mechanism 40. When the rotor 45 and the rotating shaft 24 rotate together by energizing the stator 44, the driving force is transmitted to the movable scroll 22 via the eccentric pin 32 and the bush 33, and the movable scroll 22 revolves.

  A suction passage 43 that allows the motor chamber 42 and the suction chamber 41 to communicate with each other is recessed in the rear end side of the inner peripheral surface of the front housing 11. An external pipe (not shown) is connected to the suction port 46 and communicates with the motor chamber 42. Although not shown, the external pipe is connected to an evaporator. Furthermore, the evaporator is connected to the expansion valve and the condenser by piping. The scroll compressor, the evaporator, the expansion valve and the condenser constitute a refrigeration circuit of the vehicle air conditioner. The low-pressure and low-temperature refrigerant in the refrigeration circuit is introduced into the motor chamber 42 from the suction port 46 and supplied into the suction chamber 41 through the suction passage 43.

  A discharge chamber 47 is formed between the rear end of the fixed substrate 16 </ b> C and the front end of the rear housing 12. A discharge port 48 is provided in the center of the fixed substrate 16C. The compression chamber 38 and the discharge chamber 47 communicate with each other through a discharge port 48. A discharge valve (not shown) for opening and closing the discharge port 48 and a retainer 49 for regulating the opening degree of the discharge valve are provided in the discharge chamber 47 at the rear end of the fixed substrate 16C.

  In the rear housing 12, an oil separation chamber 151 is formed behind the discharge chamber 47 and extending in the up-down direction when mounted on the vehicle. A partition wall 152 is provided between the oil separation chamber 151 and the discharge chamber 47. The partition wall 152 is provided with a discharge hole 153 that allows the oil separation chamber 151 and the discharge chamber 47 to communicate with each other. An oil separator 155 for separating the lubricating oil contained in the refrigerant is provided in the oil separation chamber 151. The oil separator 155 has a cylindrical shape and is accommodated in the oil separation chamber 151 in a fitted state.

  The refrigerant introduced into the oil separation chamber 151 from the discharge chamber 47 through the discharge hole 153 separates the lubricating oil by centrifugal separation with the oil separator 155, and the separated lubricating oil falls and is stored in the oil separation chamber 151. The upper end of the oil separation chamber 151 located above the oil separator 155 is a discharge port 56. The discharge port 56 is connected to the condenser of the refrigeration circuit by a pipe.

  In the rear housing 12, the fixed scroll 16 and the plate 61, an oil supply passage 157 including a connection passage 158, a communication passage 159 and a slit 60 is formed. The slit 60 is a narrow groove cut out in an arc shape in the plate 61. Although not shown, the slit 60 is disposed so as to go around the formation region of the suction chamber 41 and extends to the back pressure chamber 39. The connection passage 158 and the communication passage 159 are respectively provided through the rear housing 12 and the fixed scroll 16 so as to communicate the bottom portion of the oil separation chamber 151 and the slit 60. A filter 162 for removing foreign matter is fixed to the connection passage 158. The rear end portion of the filter 162 protrudes into the oil separation chamber 151. The lubricating oil stored in the oil separation chamber 151 is supplied to the back pressure chamber 39 through the oil supply passage 157 together with some refrigerant. At this time, the supply amount of the lubricating oil is appropriately reduced by the slit 60.

  As shown in FIGS. 3 and 4, the movable scroll 22 is formed with an air supply passage 50 including an inflow port 51, an outflow port 52, and an air supply hole 53. The inflow port 51 is open at the center of the front end surface 22F of the inner end portion 22C shown in FIG. 4 in the movable spiral wall 22B. The inner terminal portion 22C is an inner terminal portion of the movable spiral wall 22B that converges in a spiral toward the center of the movable scroll 22. As shown in FIG. 3, the outlet 52 is open at a position facing the rear end 24 </ b> B of the rotating shaft 24 on the front side (back side) of the movable substrate 22 </ b> A. The air supply holes 53 are fine holes penetrating the movable spiral wall 22B and the movable substrate 22A. The air supply hole 53 extends in parallel with the central axis R and connects the inflow port 51 and the outflow port 52.

  As shown in FIG. 5, when the back pressure in the back pressure chamber 39 is insufficient and the movable scroll 22 cannot be sufficiently biased toward the fixed scroll 16 at the time of start-up or at a high load, the movable scroll The center side of 22 is elastically deformed in a direction away from the fixed scroll 16, or the movable scroll 22 itself is slightly displaced in the direction of the revolution axis R. Then, the air supply passage 50 can connect the compression chamber 38 to the back pressure chamber 39 as follows. That is, the fixed substrate 16C and the front end surface 22F of the inner end portion 22C of the movable spiral wall 22B are separated from each other, and the oil seal that seals between the inlet 51 and the compression chamber 38 is broken, and the inlet 51 and the compression are compressed. The chamber 38 communicates. Then, a high-pressure refrigerant flows into the back pressure chamber 39 through the air supply hole 53 and the outlet 52. As a result, the back pressure in the back pressure chamber 39 can be maintained appropriately.

  The scroll compressor configured as described above operates as follows. That is, when the driver of the vehicle performs an operation on the vehicle air conditioner, a motor control circuit (not shown) controls the motor mechanism 40 based on the operation and rotates the rotor 45 and the rotating shaft 24. Then, the eccentric pin 32 is turned around the axis of the fixed scroll 16. At this time, the movable scroll 22 is prevented from rotating by the rotation preventing pin 23A sliding and rolling along the inner peripheral surface of the ring 23B, and only revolving around the center axis (revolution axis) R is allowed. Is done. The compression chamber 38 is moved by the revolution of the movable scroll 22 while reducing the volume from the outer peripheral side of the spiral walls 16D and 22B of the scrolls 16 and 22 to the center side. Therefore, the refrigerant returning from the evaporator through the suction port 46 into the motor chamber 42 is taken into the suction chamber 41 through the suction passage 43 and further sucked from the suction chamber 41 into the compression chamber 38 and compressed. Is done. The refrigerant compressed to the discharge pressure is discharged from the discharge port 48 to the discharge chamber 47 and discharged to the condenser via the discharge port 56. In this way, air conditioning of the vehicle air conditioner is performed.

  Here, in the electric scroll compressor according to the first embodiment, the back pressure including the lubricating oil in the back pressure chamber 39 is transmitted through the second opening 72, the communication hole 73, and the first opening 71 that constitute the oil supply hole 70. , Supplied into the injection chamber 102. At this time, the back pressure in the back pressure chamber 39 and the amount of the lubricating oil are appropriately maintained by the oil supply passage 157 and the air supply passage 50 described above, and therefore the lubricating oil is supplied to the injection chamber 102 through the oil supply hole 70. Easy to supply. A part of the lubricating oil returning together with the refrigerant from the suction port 46 into the motor chamber 42 is guided into the return chamber 101 through the guide path 111.

  In this electric scroll compressor, since the oil chamber 100 is partitioned into the return chamber 101 and the injection chamber 102 by the partition wall 103, the lubricating oil returning from the suction port 46 accumulates in the return chamber 101. , Supplied to the rolling bearing 25. On the other hand, the back pressure including the lubricating oil in the back pressure chamber 39 is injected into the injection chamber 102 and then supplied to the rolling bearing 25. At this time, even if back pressure is vigorously injected from the first opening 71 into the injection chamber 102, it is blocked by the partition wall 103 and the oil seal formed between the partition wall 103 and the tip surface 24C. It is difficult to scatter the lubricating oil accumulated in the chamber 101. As a result, this electric scroll type compressor provides a sufficient amount of lubricating oil to the rolling bearing 25 even if the operating conditions change greatly, for example, when the amount of lubricating oil returning from the suction port 46 becomes extremely small. Can be supplied.

  Therefore, the electric scroll compressor according to the first embodiment can improve the durability of the rolling bearing 25 that rotatably supports the distal end portion 24A of the rotating shaft 24.

  In addition, when the electric scroll compressor is operated, the suction port 46, the guide path 111, the return chamber 101, the partition wall 103, and the injection chamber 102 are positioned in this order from the top to the bottom. With this configuration, the lubricating oil returning from the suction port 46 is easily guided by the guide path 111 and collected in the return chamber 101 only by moving so as to hang downward in the vertical direction due to gravity. Further, the upper return chamber 101 and the lower injection chamber 102 are reliably partitioned by the partition wall 103. For this reason, this electric scroll compressor can produce the effect of this invention reliably.

  Further, the throttle member 121 is formed by fitting the throttle member 122 from the first opening 71 to the oil supply hole 70. Since the back pressure injected from the back pressure chamber 39 to the injection chamber 102 can be adjusted by the throttle portion 121, the electric scroll compressor supplies the amount of lubricating oil in the back pressure chamber 39 and the injection chamber 102. It becomes easy to optimize the amount of lubricating oil. Further, when the communication hole 73 is formed in the rotating shaft 24, for example, it is not necessary to directly form an aperture shape such as a stepped hole, so that the manufacturing process can be simplified.

  Further, since the rolling bearing 25 is employed as the bearing, it is easy to guide the lubricating oil to the return chamber 101 using the space between the outer ring 25A and the inner ring 25B.

(Example 2)
As shown in FIG. 6, the electric scroll compressor according to the second embodiment employs a notch 112 as a guide path instead of the guide path 111 according to the first embodiment. Other configurations of the second embodiment are the same as those of the first embodiment. For this reason, about the same structure as Example 1, the same code | symbol is attached | subjected and description is abbreviate | omitted or simplified.

  In the electric scroll compressor according to the second embodiment, the boss 14 </ b> A of the bearing holding portion 14 is notched at a portion located below the suction port 46. Due to the cutout 112, the boss 14A has an arcuate shape that opens at the top when viewed from the direction of the arrow B as shown in FIG. 6B. As shown in FIG. 6A, in a state where the outer ring 25A of the rolling bearing 25 is fitted to the inner cylindrical surface 14B of the boss 14A, the notch 112 is recessed deeper on the tip side than the rolling bearing 25, It communicates with the return room 101.

  In the electric scroll compressor according to the second embodiment having such a configuration, when the lubricating oil returning from the suction port 46 hangs downward in the vertical direction, the lubricating oil is directly guided to the return chamber 101 by the notch 112. Can do. In addition, the lubricating oil returning from the suction port 46 can easily come into contact with the upper portion of the outer ring 25 </ b> A of the rolling bearing 25. This lubricating oil is easily supplied to the gap between the outer ring 25A and the inner ring 25B through the outer ring 25A.

  Therefore, similarly to the electric scroll compressor of the first embodiment, the electric scroll compressor of the second embodiment also realizes improved durability with respect to the rolling bearing 25 that rotatably supports the tip 24A of the rotating shaft 24. it can. Moreover, since the process of the notch 112 is comparatively easy, complication of the manufacturing process which forms a guide part can be suppressed.

(Example 3)
As illustrated in FIG. 7, the electric scroll compressor according to the third embodiment employs a throttle portion 123 instead of the throttle portion 121 according to the first embodiment. Other configurations of the third embodiment are the same as those of the first embodiment. For this reason, about the same structure as Example 1, the same code | symbol is attached | subjected and description is abbreviate | omitted or simplified.

  In the electric scroll compressor according to the third embodiment, as shown in FIG. 7A, the throttle member 122 is not fitted into the communication hole 73 from the first opening 71. That is, the 1st opening 71, the communicating hole 73, and the 2nd opening 72 are made into the same internal diameter, and the process of the oil supply hole 70 is simplified.

  On the other hand, as shown in FIG. 7B, the partition wall 103 of the bearing holding portion 14 is formed with a protruding portion 124 extending downward. As shown in FIG. 7A, the projecting portion 124 extends below the first opening 71 and faces the first opening 71 with a gap. The gap between the first opening 71 and the protruding portion 124 is narrowed to such an extent that an oil seal is not formed. Such a gap between the first opening 71 and the protruding portion 124 serves as a throttle portion 123. The throttle portion 123 can adjust the back pressure injected from the back pressure chamber 39 to the injection chamber 102, so that the electric scroll compressor has the amount of lubricating oil in the back pressure chamber 39 and the injection chamber 102. It becomes easy to optimize the amount of lubricating oil supplied to.

  Therefore, the electric scroll compressor according to the third embodiment also has improved durability with respect to the rolling bearing 25 that rotatably supports the distal end portion 24A of the rotating shaft 24, similarly to the electric scroll compressor according to the first and second embodiments. Can be realized. Further, when the partition wall 103 is formed on the bearing holding portion 14, the projecting portion 124 can be processed at the same time, so that the manufacturing process can be prevented from becoming complicated.

  In the above, the present invention has been described with reference to the first to third embodiments. However, the present invention is not limited to the first to third embodiments, and can be appropriately modified and applied without departing from the spirit of the present invention. Needless to say.

  For example, in the above embodiment, the position of the suction port 46 may be at any position in the motor chamber 42. As the motor mechanism 40 is driven, a swirling flow of the refrigerant is generated in the motor chamber 42, so that the lubricating oil adheres to the wall surface of the motor chamber 42 by centrifugal force. A part of the adhering lubricating oil is guided to the oil chamber 100 through the guide paths 111 and 112.

  In the first embodiment, the rolling bearing 25 is employed as the bearing, but different types such as a sliding bearing may be employed.

  The present invention is applicable to, for example, a vehicle air conditioner.

42 ... Motor chamber 10 ... Housing (11 ... Front housing, 12 ... Rear housing)
24 ... Rotating shaft 40 ... Motor mechanism 24A ... One end (tip) of the rotating shaft
25 ... Bearing (Rolling bearing)
16 ... Fixed scroll 24B ... The other end (rear end) of the rotating shaft
DESCRIPTION OF SYMBOLS 38 ... Compression chamber 22 ... Movable scroll 39 ... Back pressure chamber 15 ... Shaft support member 46 ... Suction port 24C ... One end surface of one end (tip surface of tip)
DESCRIPTION OF SYMBOLS 100 ... Oil chamber 14 ... Bearing holding part 71 ... 1st opening 72 ... 2nd opening 73 ... Communication hole 70 ... Oil supply hole 111, 112 ... Guide way (112 ... Notch)
DESCRIPTION OF SYMBOLS 103 ... Partition wall 101 ... Return chamber 102 ... Injection chamber 14A ... Boss 121, 123 ... Restriction part 122 ... Restriction member 16C ... Fixed substrate 16D ... Fixed spiral wall 22A ... Movable substrate 22B ... Movable spiral wall 22F ... One of movable spiral walls End face (tip face)
51 ... Inlet 52 ... Outlet 53 ... Air supply hole 50 ... Air supply passage R ... Revolution shaft (center axis of the rotation shaft)

Claims (7)

A housing in which a motor chamber is formed; a motor mechanism provided in the motor chamber and capable of rotating a rotary shaft; a bearing provided in the motor chamber and rotatably supporting one end of the rotary shaft; and the housing A fixed scroll fixed to the movable scroll provided in the housing so as to be able to revolve only by the other end of the rotary shaft, and a movable scroll that forms a compression chamber between the fixed scroll and the fixed scroll. In a scroll compressor comprising a shaft support member forming a back pressure chamber between the movable scroll,
The housing is formed with a suction port communicating with the motor chamber from the outside, and a bearing holding portion that holds the bearing and forms an oil chamber between one end surface of the one end portion,
The rotary shaft communicates with the first opening that opens to the one end surface and faces the oil chamber, the second opening that opens to the back pressure chamber at the other end, and the first opening and the second opening. An oil supply hole composed of a communication hole to be formed is formed,
On the wall surface of the motor chamber, a guide path capable of guiding the lubricating oil returning from the suction port into the oil chamber is formed,
An electric scroll type, wherein the bearing holding portion is formed with a partition wall that partitions the oil chamber into a return chamber communicating with the guide path and an injection chamber communicating with the first opening. Compressor.   2. The electric scroll compressor according to claim 1, wherein the suction port, the guide path, the return chamber, the partition wall, and the injection chamber are positioned in this order from the upper side to the lower side during operation. The bearing holding portion has a boss protruding in the housing,
The electric scroll compressor according to claim 2, wherein the guide path is a notch provided in the boss.   The electric scroll compressor according to any one of claims 1 to 3, wherein the bearing is a rolling bearing.   The electric scroll compressor according to any one of claims 1 to 4, wherein the oil supply hole has a throttle portion.   6. The electric scroll compressor according to claim 5, wherein the throttle portion is formed by fitting a throttle member to the communication hole. The fixed scroll has a fixed substrate and a fixed spiral wall that is integral with the fixed substrate,
The movable scroll has a movable substrate facing the fixed substrate, a movable spiral wall that is integral with the movable substrate and meshes with the fixed spiral wall,
The movable scroll has an inlet opening at one end surface of the movable spiral wall and communicating with the compression chamber, an outlet formed on the movable substrate and communicating with the back pressure chamber, the inlet, and the 7. An air supply passage that is formed of an air supply hole that communicates with an outflow port and that communicates the compression chamber with the back pressure chamber by elastic deformation of the movable scroll or displacement in the revolution axis direction. The electric scroll compressor according to any one of the above.

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