JP2014118893A - Scroll compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress the excessive supply of oil to a slide portion between a movable scroll and a fixed scroll while preventing an oil path from being closed in a scroll compressor for supplying the oil to the slide portion via the oil path.SOLUTION: A scroll compressor 10 includes: a fixed scroll 31; a movable scroll 32; a driving motor; and a housing 33. The movable scroll includes: a movable-side end plate 321 having a slide contact surface 321b slidably contacting a thrust surface 313a of the fixed scroll; and a boss portion 323 extending from a back surface 321c of the end plate. The driving motor is coupled to the boss portion via a crankshaft 60 and rotates the movable scroll. In the housing, a crank chamber 37 in which the boss portion is arranged, and an oil path 70 for supplying oil from the crank chamber to the slide contact surface are formed. The oil path includes a linear portion 72 extending from an opening of an outer circumferential surface 33a of the housing. A flow-volume restriction member 40 in which a spiral groove is formed is inserted into the linear portion, thereby forming a spiral oil path 72c.

Description

  The present invention relates to a scroll compressor in which oil is supplied to a sliding portion between a movable scroll and a fixed scroll through an oil passage.

  2. Description of the Related Art Conventionally, there is known a scroll compressor that supplies high-pressure oil to a sliding surface between a movable scroll and a fixed scroll via a flow restriction unit. For example, in Patent Document 1 (Japanese Patent Application Laid-Open No. 2004-60532), the movable scroll is provided with a hole extending toward the center from the outer peripheral surface of the movable scroll, and a rod-shaped member having a spiral groove formed on the outer periphery is provided in the hole. A scroll compressor in which a helical oil passage is formed as a flow restricting portion by being inserted is disclosed.

  However, with a configuration such as that of Patent Document 1 (Japanese Patent Application Laid-Open No. 2004-60532), the outer diameter of the rod-shaped member cannot be made equal to or greater than the thickness of the end plate of the movable scroll. In addition, since the hole is formed from the outer peripheral surface of the movable scroll toward the center, the length of the rod-shaped member cannot be equal to or greater than the radius of the movable scroll. As a result, a sufficiently long spiral oil passage cannot be formed, and excess oil is supplied to the sliding surfaces of the movable scroll and the fixed scroll, which may adversely affect the efficiency of the scroll compressor. .

  With respect to such a problem, if the passage area of the spiral groove of the rod-shaped member is reduced, the flow rate of oil can be suppressed. However, when the passage area is reduced, the spiral groove may be blocked by minute foreign matter such as wear powder.

  An object of the present invention is a scroll compressor that supplies oil to a sliding portion between a movable scroll and a fixed scroll through an oil passage, and prevents excessive blocking of the oil passage due to foreign matters while excessively applying to the sliding surface. An object of the present invention is to provide an efficient and highly reliable scroll compressor capable of suppressing supply of oil.

  A scroll compressor according to a first aspect of the present invention includes a fixed scroll, a movable scroll, a drive unit, and a housing. The fixed scroll has a thrust surface. The movable scroll has a disk-shaped end plate having a sliding contact surface that is in sliding contact with the thrust surface, and a boss portion extending from the rear surface of the end plate, and forms a compression chamber between the fixed scroll and the fixed scroll. The drive unit is connected to a boss portion of the movable scroll via a crankshaft. The drive unit turns the movable scroll to compress the fluid in the compression chamber. A crank chamber in which the boss portion is disposed is formed in the housing. The housing is formed with a hole serving as an oil passage for supplying oil from the vicinity of the crank chamber to the sliding contact surface. The hole includes a straight portion extending into the housing from the opening on the outer peripheral surface of the housing. A rod-like member having a spiral groove formed on the outer peripheral surface is inserted into the straight line portion to form a spiral oil passage.

  Here, the linear portion for inserting the rod-shaped member having the spiral groove formed on the outer peripheral surface is formed in the housing in which the crank chamber is formed so as to extend from the opening on the outer peripheral surface of the housing. A spiral oil passage can be formed. Therefore, the oil flow rate can be appropriately adjusted by the spiral oil passage to prevent excessive oil from being supplied to the sliding surface. In addition, since a sufficiently long spiral oil passage can be formed, it is not necessary to make the passage area of the spiral groove excessively small in order to suppress the amount of oil supply, and the blockage of the spiral oil passage is suppressed. it can. As a result, an efficient and highly reliable scroll compressor can be realized.

  The scroll compressor which concerns on the 2nd viewpoint of this invention is a scroll compressor which concerns on a 1st viewpoint, Comprising: The length of a rod-shaped member is longer than half of the outer diameter of an end plate.

  Here, since a rod-shaped member longer than half the outer diameter of the end plate of the movable scroll is inserted into the housing, a longer helical oil passage can be formed compared to the case where the rod-shaped member is inserted into the movable scroll. Therefore, it is easy to appropriately adjust the oil flow rate by the spiral oil passage while suppressing the blockage of the spiral oil passage.

  The scroll compressor which concerns on the 3rd viewpoint of this invention is a scroll compressor which concerns on a 1st viewpoint or a 2nd viewpoint, Comprising: A linear part is extended in the horizontal direction longer than the axial direction of a crankshaft.

  Here, by forming the spiral oil passage extending long in the horizontal direction, the flow rate of the oil can be appropriately adjusted by the spiral oil passage while suppressing the blockage of the spiral oil passage.

  A scroll compressor according to a fourth aspect of the present invention is the scroll compressor according to any one of the first aspect to the third aspect, and in plan view, the opening and the tip of the linear portion extending into the housing are: Arranged on the opposite side to the center of the housing.

  Here, since the opening and the tip of the straight portion are arranged on the opposite side with respect to the center of the housing, the length of the straight portion can be increased and the helical oil passage can be formed longer. Therefore, it is easy to appropriately adjust the oil flow rate by the spiral oil passage while suppressing the blockage of the spiral oil passage.

  A scroll compressor according to a fifth aspect of the present invention is the scroll compressor according to any one of the first to fourth aspects, wherein the linear portion extends from a first opening formed on the outer peripheral surface of the housing. 1 linear part and the 2nd linear part extended from the 2nd opening formed in the outer peripheral surface of a housing are included. The rod-shaped member includes a first rod-shaped member and a second rod-shaped member. The second straight portion communicates with the vicinity of the tip of the first straight portion extending from the first opening in the vicinity of the second opening. A first rod-like member and a second rod-like member are inserted into the first straight portion and the second straight portion, respectively, thereby forming a first spiral oil passage and a second spiral oil passage.

  Here, since the oil that has passed through both the first spiral oil passage and the second spiral oil passage is supplied to the sliding contact surface, the flow rate of the oil cannot be sufficiently suppressed by one spiral oil passage. As a whole, the flow rate of oil can be adjusted appropriately.

  A scroll compressor according to a sixth aspect of the present invention is the scroll compressor according to any of the first to fourth aspects, wherein the linear portion extends from a third opening formed in the outer peripheral surface of the housing. 3 linear parts and the 4th linear part extended from the 4th opening formed in the outer peripheral surface of a housing, and not connecting with a 3rd linear part. The rod member includes a third rod member and a fourth rod member. A third rod-like member and a fourth rod-like member are inserted into the third straight portion and the fourth straight portion, respectively, thereby forming a third spiral oil passage and a fourth spiral oil passage.

  Here, a plurality of spiral oil passages that do not communicate with each other are formed, and the oil that has passed through each spiral oil passage is supplied to the sliding contact surface, so that it is easy to supply oil to a plurality of locations on the sliding contact surface. is there.

  A scroll compressor according to a seventh aspect of the present invention is the scroll compressor according to any one of the first to sixth aspects, wherein the linear portion extends in the horizontal direction and also in the vertical direction.

  Here, since the plurality of oil passages also extend in the vertical direction, it is possible to form a long straight portion rather than forming a straight portion extending only in the horizontal direction.

  A scroll compressor according to an eighth aspect of the present invention is the scroll compressor according to any one of the first to seventh aspects, wherein the fixed scroll communicates with the hole and slides the oil supplied from the hole. A communication passage for supplying the contact surface is formed.

  Here, the oil can be supplied to a desired position on the sliding contact surface via the communication path of the fixed scroll.

  A scroll compressor according to a ninth aspect of the present invention is the scroll compressor according to any one of the first to eighth aspects, wherein the linear portion is a straight line that does not pass through the axis of the crankshaft in plan view. Arranged.

  Here, it is possible to form a straight portion longer than the radius of the housing.

  In the scroll compressor according to the present invention, a linear portion for inserting a rod-shaped member having a spiral groove formed on the outer peripheral surface thereof is formed in the housing in which the crank chamber is formed so as to extend from the opening of the outer peripheral surface of the housing. Therefore, a sufficiently long spiral oil passage can be formed. Therefore, the oil flow rate can be appropriately adjusted by the spiral oil passage to prevent excessive oil from being supplied to the sliding surface. In addition, since a sufficiently long spiral oil passage can be formed, it is not necessary to make the passage area of the spiral groove excessively small in order to suppress the amount of oil supply, and the blockage of the spiral oil passage is suppressed. it can. As a result, an efficient and highly reliable scroll compressor can be realized.

It is a schematic longitudinal cross-sectional view of the scroll compressor which concerns on embodiment of this invention. It is the schematic plan view which looked at the fixed scroll of the scroll compressor of FIG. 1 from the downward direction. It is the schematic plan view which looked at the movable scroll of the scroll compressor of FIG. 1 from upper direction. It is a schematic longitudinal cross-sectional view of the compression mechanism periphery for demonstrating the oil path for supplying oil to the sliding contact surface of the movable scroll of the scroll compressor of FIG. It is a schematic sectional drawing of the housing in the VV arrow view of FIG. The rod-shaped member insertion portion is depicted. It is a schematic side view of the rod-shaped member inserted in the linear part of the oil path of the scroll compressor of FIG. FIG. 10 is a schematic cross-sectional view of a housing of a scroll compressor according to modification A. The rod-shaped member insertion portion is depicted. A first spiral oil passage and a second spiral oil passage are formed in the housing, and both the spiral oil passages communicate with each other. 10 is a schematic cross-sectional view of a housing of a scroll compressor according to Modification B. FIG. The rod-shaped member insertion portion is depicted. A fourth spiral oil passage that does not communicate with the third spiral oil passage and the third spiral oil passage is formed in the housing. 10 is a schematic cross-sectional view of a housing of a scroll compressor according to Modification C. FIG. The rod-shaped member insertion portion is depicted. A first spiral oil passage and a second spiral oil passage are formed in the housing, and both the spiral oil passages communicate with each other. The crank chamber and the straight portion into which the first rod-like member is inserted are in direct communication. 10 is a schematic longitudinal sectional view of the periphery of a compression mechanism for explaining an oil passage for supplying oil to a sliding contact surface of a movable scroll of a scroll compressor according to Modification D. FIG. The straight portion of the oil passage is formed to extend in the vertical direction (axial direction of the crankshaft) in addition to the horizontal direction.

  An embodiment of a scroll compressor of the present invention will be described with reference to the drawings. Note that the following embodiments can be appropriately changed without departing from the gist of the present invention.

(1) Overall Configuration The scroll compressor 10 according to the present embodiment is used for an outdoor unit of an air conditioner as a refrigeration apparatus. In addition, the use of the scroll compressor 10 is an illustration, It is not limited to this.

  As shown in FIG. 1, the scroll compressor 10 mainly includes a casing 20, a compression mechanism 30, a drive motor 50, a crankshaft 60, and a lower bearing 65.

  The configuration of the scroll compressor 10 will be described in detail below. In the following description, the direction will be described with the direction of the arrow U in FIG.

(2) Detailed Configuration (2-1) Casing The scroll compressor 10 has a vertically long cylindrical casing 20. As shown in FIG. 1, the casing 20 includes a cylindrical member 21 that is open at the top and bottom, and an upper lid 22 a and a lower lid 22 b that are respectively provided at the upper end and the lower end of the cylindrical member 21. The cylindrical member 21, and the upper lid 22a and the lower lid 22b are fixed by welding so as to keep airtightness.

  As shown in FIG. 1, the casing 20 accommodates components of the scroll compressor 10 including the compression mechanism 30, the drive motor 50, the crankshaft 60, and the lower bearing 65. An oil sump space 26 is formed in the lower part of the casing 20 as shown in FIG. In the oil reservoir space 26, oil O for lubricating the compression mechanism 30 and the like is stored. The oil sump space 26 communicates with a first space S1 described later.

  As shown in FIG. 1, a suction pipe 23 that sucks in a gas refrigerant that is a compression target of the compression mechanism 30 is provided in the upper portion of the casing 20 so as to penetrate the upper lid 22a. The lower end of the suction pipe 23 is connected to a fixed scroll 31 of the compression mechanism 30 described later. The suction pipe 23 communicates with a compression chamber 35 of the compression mechanism 30 described later. A low-pressure gas refrigerant before compression flows through the suction pipe 23.

  As shown in FIG. 1, a discharge pipe 24 through which a gas refrigerant discharged to the outside of the casing 20 passes is provided at an intermediate portion of the cylindrical member 21 of the casing 20. The discharge pipe 24 is arranged so that the end of the discharge pipe 24 inside the casing 20 protrudes into the first space S <b> 1 formed below the housing 33 of the compression mechanism 30. A high-pressure gas refrigerant compressed by the compression mechanism 30 flows through the discharge pipe 24.

(2-2) Compression Mechanism As shown in FIG. 1, the compression mechanism 30 is mainly combined with the housing 33, the fixed scroll 31 disposed above the housing 33, and the compression scroll 35. The movable scroll 32 is formed. The housing 33 is formed with a crank chamber 37 in which a boss portion 323 of a movable scroll 32 described later is disposed. A back pressure space 36 is formed between the movable scroll 32 and the housing 33.

(2-2-1) Fixed Scroll As shown in FIG. 1 and FIG. 2, the fixed scroll 31 has a spiral shape protruding from a disk-shaped fixed side end plate 311 and a front surface 311 a (lower surface) of the fixed side end plate 311. The fixed side wrap 312 and the peripheral edge 313 surrounding the fixed side wrap 312.

  A non-circular discharge port 311 b communicating with a compression chamber 35 described later is formed in the center of the fixed side end plate 311 so as to penetrate the fixed side end plate 311 in the thickness direction. The gas refrigerant compressed in the compression chamber 35 is discharged upward from the discharge port 311b, passes through a refrigerant passage (not shown) formed in the fixed scroll 31 and the housing 33, and flows into the first space S1.

  The fixed side wrap 312 is formed in a spiral shape and protrudes from the front surface 311 a of the fixed side end plate 311. The fixed side wrap 312 and the movable side wrap 322 of the movable scroll 32 to be described later are combined so that the front surface 311a of the fixed side end plate 311 and the front surface 321a of the movable side end plate 321 face each other. A compression chamber 35 is formed between the two. As will be described later, the movable scroll 32 is pressed against the fixed scroll 31 by the force generated in the back pressure space 36 and the crank chamber 37. The end surface of the fixed side wrap 312 on the movable scroll 32 side and the front surface 321a of the movable side end plate 321 are in close contact with each other. Similarly, the end surface of the movable side wrap 322 on the fixed scroll 31 side and the front surface 311a of the fixed side end plate 311 are in close contact with each other.

  The peripheral edge portion 313 is formed in a thick ring shape and is disposed so as to surround the fixed side wrap 312. The peripheral portion 313 has a thrust surface 313a that comes into sliding contact with a sliding contact surface 321b of a movable side end plate 321 of the movable scroll 32 described later.

  During the operation of the scroll compressor 10 (while the drive motor 50 is in operation), the movable scroll 32 is pressed against the fixed scroll 31 by the force generated in the back pressure space 36 and the crank chamber 37 as described later. As a result, during the operation of the scroll compressor 10, the sliding surface 321 b of the movable scroll 32 is pressed against the thrust surface 313 a of the fixed scroll 31. During the operation of the scroll compressor 10, the movable scroll 32 turns (revolves) with respect to the fixed scroll 31, so that the thrust surface 313 a of the peripheral edge 313 and the sliding surface 321 b of the movable side end plate 321 Are in sliding contact. The thrust surface 313a includes a surface that is always in sliding contact with the sliding contact surface 321b of the movable side end plate 321 and a surface that is intermittently in contact with the sliding contact surface 321b of the movable side end plate 321 during operation of the scroll compressor 10. ,including.

  An oil groove 313b and a communication groove 313d are formed on the thrust surface 313a of the peripheral edge 313 (see FIG. 2). A fixed scroll side communication passage 80 for supplying oil to the oil groove 313b is formed in the peripheral edge portion 313 (see FIG. 4). The oil groove 313b, the communication groove 313d, and the fixed scroll side communication path 80 will be described below.

(2-2-1-1) Oil Groove The oil groove 313b (see FIG. 2) is a groove formed in an arc shape on the thrust surface 313a of the peripheral edge portion 313. The oil groove 313b is formed on a surface of the thrust surface 313a that is always in sliding contact with the sliding contact surface 321b of the movable side end plate 321 during the operation of the scroll compressor 10. As shown in FIG. 2, the oil groove 313 b is formed counterclockwise from the vicinity of a communication groove 313 d described later to the vicinity of the end of winding of the fixed side wrap 312 when the fixed scroll 31 is viewed from below. In addition, the shape and arrangement | positioning of the oil groove 313b are illustrations, Comprising: It is not limited to this.

  The oil groove 313b is lubricated to lubricate the contact portion between the peripheral edge 313 and the movable side end plate 321, in other words, to lubricate the thrust surface 313a of the peripheral end 313 and the sliding contact surface 321b of the movable end end plate 321. O is supplied. The oil O enters the oil groove 313b from the crank chamber 37 formed in the housing 33 through an oil passage 70 formed in the housing 33 described later and a fixed scroll side communication passage 80 formed in the fixed scroll 31. Supplied. The oil O supplied to the oil groove 313 b is supplied to the sliding contact surface 321 b of the movable side end plate 321. Further, since the movable scroll 32 revolves with respect to the fixed scroll 31, the sliding contact surface 321 b of the movable side end plate 321 and the thrust surface 313 a of the peripheral edge 313 are in sliding contact with each other, so that the oil O is in sliding contact with the movable side end plate 321. It spreads over the entire surface 321b. Oil O is also supplied to the thrust surface 313a that is in sliding contact with the sliding contact surface 321b.

  As will be described later, the oil O in the crank chamber 37 of the housing 33 is depressurized (the flow rate is adjusted) in an oil passage 70 formed in the housing 33, so that a high pressure (discharge pressure) is provided in the oil groove 313b. Oil O adjusted to a slightly lower pressure (referred to herein as a quasi-high pressure) is supplied.

(2-2-1-2) Communication groove The communication groove 313d (see FIGS. 1 and 2) is formed on the thrust surface 313a of the peripheral edge 313 so as to extend from the inner peripheral edge of the peripheral edge 313 to the outer peripheral side. It is a groove. As shown in FIG. 2, the communication groove 313 d is formed on the inner side by about one turn from the end of winding of the fixed side wrap 312. The communication groove 313d is formed in an L shape. The communication groove 313d is formed on a surface of the thrust surface 313a that is always in sliding contact with the sliding contact surface 321b of the movable side end plate 321 during operation of the scroll compressor 10.

  When the movable scroll 32 revolves with respect to the fixed scroll 31, the communication groove 313 d is 1 through a communication hole 321 d (see FIGS. 1 and 3) formed in the movable side end plate 321 of the movable scroll 32 described later. It communicates with the back pressure space 36 for a predetermined period during the revolution cycle (including the case of continuous communication). Further, since the communication groove 313d extends from the inner peripheral edge of the peripheral edge portion 313, the communication groove 313d always communicates with the compression chamber 35 located on the peripheral edge side. That is, the peripheral compression chamber 35 and the back pressure space 36 communicate with each other through the communication groove 313 d and the communication hole 321 d of the movable scroll 32 for a predetermined period during one revolution cycle of the movable scroll 32. The compression chamber 35 on the peripheral side is a compression chamber 35 in the middle of compression, and the pressure in the compression chamber 35 on the peripheral side is an intermediate pressure between the suction pressure and the discharge pressure.

  The shape of the communication groove 313d is an example, and the compression chamber 35 and the back pressure space 36 on the peripheral side (the communication groove 313d and the communication hole 321d of the movable scroll 32) form one revolution cycle of the movable scroll 32. Other shapes (for example, a straight shape, a J shape, etc.) designed to communicate with each other for a predetermined period of time may be used.

(2-2-1-3) Fixed Scroll Side Communication Channel The fixed scroll side communication channel 80 includes a first vertical channel 81, a horizontal channel 82, and a second vertical channel 83, as shown in FIG.

  The first vertical passage 81 is a hole formed so as to extend in the vertical direction (in the axial direction of the crankshaft 60) within the peripheral edge 313 of the fixed scroll 31. The first vertical passage 81 is formed so as to communicate with an oil passage 70 formed in the housing 33 described later. The lower end of the first vertical passage 81 opens at the lower surface of the fixed scroll 31 and communicates with the opening at the upper end of the housing side communication passage 73 of the oil passage 70 described later.

  The horizontal passage 82 is a hole formed in the peripheral edge 313 of the fixed scroll 31 so as to communicate the first vertical passage 81 and the second vertical passage 83. The lateral passage 82 extends in the horizontal direction from the outer peripheral surface of the fixed scroll 31. The horizontal passage 82 extends from the outer peripheral surface of the fixed scroll 31, communicates with the first vertical passage 81, and further extends to the second vertical passage 83. The opening of the lateral passage 82 formed on the outer peripheral surface of the fixed scroll 31 is closed by a plug 84. Since the opening of the outer peripheral surface of the fixed scroll 31 is closed by the plug 84, the oil O flowing through the fixed scroll side communication passage 80 does not flow out of the opening of the outer peripheral surface of the fixed scroll 31.

  The second vertical passage 83 is a hole formed so as to extend in the vertical direction within the peripheral edge portion 313 of the fixed scroll 31. The second vertical passage 83 is formed so as to communicate the horizontal passage 82 and the oil groove 313b. A communication hole 313c communicating with the oil groove 313b is formed at the lower end of the second vertical passage 83 (see FIG. 4). The diameter of the communication hole 313c is formed smaller than the diameter of the second vertical passage 83 so as to be the same as the width of the oil groove 313b (see FIGS. 2 and 4).

(2-2-2) Movable Scroll As shown in FIG. 1, the movable scroll 32 is formed in a circular plate-shaped movable side end plate 321, a movable side wrap 322 formed in a spiral shape, and a cylindrical shape. And a boss portion 323.

  The movable side end plate 321 is a disk-shaped member having an outer diameter D1, as shown in FIGS. As shown in FIG. 1, the movable side end plate 321 is formed with a communication hole 321d that penetrates the movable side end plate 321 in the thickness direction (vertical direction). The movable side end plate 321 has a front surface 321a disposed on the upper side of the movable side end plate 321, facing the fixed scroll 31, and a back surface 321c disposed on the opposite side of the front surface 321a (disposed on the lower side). .

  When the movable scroll 32 revolves with respect to the fixed scroll 31, the communication hole 321 d is disposed so as to communicate with a communication groove 313 d formed in the peripheral edge 313 of the fixed scroll 31 for a predetermined period in one revolution cycle. As described above, the compression chamber 35 on the peripheral side and the back pressure space 36 are connected to each other of the movable scroll 32 via the communication hole 321 d of the movable side end plate 321 and the communication groove 313 d of the peripheral portion 313 of the fixed scroll 31. Communicate for a predetermined period during the revolution cycle.

  A movable side wrap 322 combined with the fixed side wrap 312 of the fixed scroll 31 extends from the front surface 321a of the movable side end plate 321 so as to protrude upward. The front surface 321 a of the movable side end plate 321 includes a slidable contact surface 321 b that slidably contacts the thrust surface 313 a of the peripheral edge 313 of the fixed scroll 31. The sliding contact surface 321b is disposed on the peripheral side of the movable side end plate 321. Oil O is supplied to the sliding contact surface 321b of the movable side end plate 321 through the oil groove 313b formed in the peripheral edge 313 of the fixed scroll 31 as described above. The oil O supplied to the sliding contact surface 321b spreads over the entire sliding contact surface 321b when the sliding contact surface 321b and the thrust surface 313a of the peripheral edge portion 313 are in sliding contact.

  From the back surface 321c of the movable side end plate 321, a boss portion 323 extends so as to protrude downward. The boss portion 323 is disposed in a crank chamber 37 formed in the housing 33. The boss portion 323 is formed in a cylindrical shape whose upper end is closed. The movable scroll 32 and the crankshaft 60 are connected by inserting an eccentric portion 61 of the crankshaft 60 described later into the boss portion 323.

  As will be described later, the crankshaft 60 is also connected to the drive motor 50, and when the drive motor 50 is operated (when the scroll compressor 10 is operated), the boss portion 323 is connected to the crankshaft 60. The scroll 32 turns. More specifically, the movable scroll 32 revolves without rotating with respect to the fixed scroll 31 by the action of the Oldham coupling 34 disposed on the back surface 321 c side of the movable scroll 32. When the movable scroll 32 is revolved with respect to the fixed scroll 31 by the drive motor 50, the gas refrigerant in the compression chamber 35 of the compression mechanism 30 is compressed. More specifically, when the movable scroll 32 is revolved, gas refrigerant is sucked into the compression chamber 35 from the peripheral side of the compression chamber 35 through the suction pipe 23, and then the compression chamber 35 is moved to the fixed side end plate 311 and the movable side. It moves to the center side of the end plate 321. As the compression chamber 35 moves toward the center, the volume of the compression chamber 35 decreases and the pressure in the compression chamber 35 increases. That is, the compression chamber 35 on the center side has a higher pressure than the compression chamber 35 on the peripheral side. The compressed gas refrigerant becomes a high-pressure gas refrigerant, is discharged from the central compression chamber 35 through the discharge port 311b, passes through a refrigerant passage (not shown) formed in the fixed scroll 31 and the housing 33, and passes through the first refrigerant passage. It flows into space S1.

  The crank chamber 37 in which the boss portion 323 is arranged has a high pressure because high-pressure oil O is supplied from the oil sump space 26 as will be described later. More specifically, during the steady operation of the scroll compressor 10, the pressure in the crank chamber 37 becomes equal to the discharge pressure of the scroll compressor 10. Due to the pressure acting on the crank chamber 37, a force that pushes the movable scroll 32 upward toward the fixed scroll 31 is generated on the back surface 321 c of the movable side end plate 321 in the crank chamber 37. The movable scroll 32 is in close contact with the fixed scroll 31 by the resultant force of the force generated by the pressure in the crank chamber 37 and the force generated by the pressure in the back pressure space 36 described later.

(2-2-3) Back Pressure Space The back pressure space 36 is a space formed above the housing 33 described later and on the back surface 321c side of the movable side end plate 321 of the movable scroll 32. The back pressure space 36 is arranged on the peripheral side with respect to the crank chamber 37 formed near the center of the movable side end plate 321. In order to separate the back pressure space 36 and the crank chamber 37, a seal ring (not shown) is disposed between the housing 33 and the back surface 321 c of the movable side end plate 321.

  In the back pressure space 36, the communication groove 313 d of the peripheral edge 313 of the fixed scroll 31 and the communication hole 321 d of the movable side end plate 321 of the movable scroll 32 are in constant communication during one revolution cycle of the movable scroll 32 (always communicating). When communication is made (including the case), it communicates with the compression chamber 35 located on the peripheral side and having an intermediate pressure between the suction pressure and the discharge pressure.

  Due to the pressure in the back pressure space 36, a force is generated in the movable scroll 32 to push the back surface 321 c of the movable side end plate 321 upward toward the fixed scroll 31. The movable scroll 32 is in close contact with the fixed scroll 31 by the resultant force of the force generated by the pressure in the back pressure space 36 and the force generated by the pressure in the crank chamber 37.

(2-2-4) Housing As shown in FIG. 1, the housing 33 is a member that is press-fitted and fixed to the cylindrical member 21 on the entire outer circumferential surface 33 a in the circumferential direction. The outer diameter of the housing 33 is D2 (see FIG. 5). The fixed scroll 31 is fixed to the housing 33 such that the lower surface of the peripheral edge 313 of the fixed scroll 31 and the upper end surface of the housing 33 face each other. Further, the housing 33 supports the movable scroll 32 below via the Oldham coupling 34.

  As shown in FIG. 1, the housing 33 includes a first recess 331 disposed so as to be recessed in the central portion of the upper surface, a second recess 332 disposed so as to surround the first recess 331, and the first recess 331. A bearing housing part 333 disposed below is formed. Further, as shown in FIG. 4, the housing 33 is supplied with oil O in the crank chamber 37 to the sliding contact surface 321 b of the movable side end plate 321 of the movable scroll 32 (of the peripheral portion 313 of the fixed scroll 31. An oil passage 70 (for supplying to an oil groove 313b formed in the thrust surface 313a) is formed.

  The first recess 331 surrounds the side surface of the crank chamber 37 where the boss portion 323 of the movable scroll 32 is disposed.

  The second recess 332 is a part of the lower surface and side surface surrounding the back pressure space 36.

  A bearing metal 334 is provided in the bearing housing portion 333. The bearing metal 334 rotatably supports the main shaft 62 of the crankshaft 60. In addition, at the periphery of the bearing metal 334, oil O supplied for lubrication of the bearing metal 334 from an oil supply path 63 formed in the main shaft 62, which will be described later, flows toward the crank chamber 37. Is formed.

  The oil passage 70 is a hole that communicates the crank chamber 37 with the fixed scroll side communication passage 80 formed in the fixed scroll 31. Oil O in the crank chamber 37 is supplied to an oil groove 313 b formed in the peripheral edge 313 of the fixed scroll 31 through the oil passage 70 and the fixed scroll side communication passage 80. The oil O in the crank chamber 37 is transferred to the oil groove 313b due to a pressure difference between the high-pressure crank chamber 37 and the compression chamber 35 in the vicinity of the oil groove 313b, which is lower in pressure than the crank chamber 37. The oil O supplied to the oil groove 313 b is supplied to the sliding contact surface 321 b of the movable side end plate 321 of the movable scroll 32.

  The oil passage 70 includes an introduction passage 71, a straight portion 72, and a housing side communication passage 73 (see FIGS. 4 and 5).

  As shown in FIG. 5, the introduction path 71 is a hole that opens to the inner peripheral surface 331 a of the first recess 331 and extends in the housing 33 toward the outer peripheral surface 33 a side of the housing 33. The introduction path 71 communicates with the crank chamber 37. An end portion of the introduction path 71 on the outer peripheral surface 33 a side of the housing 33 communicates with the linear portion 72.

  As shown in FIGS. 4 and 5, the straight portion 72 is a straight hole extending horizontally in the housing 33. The linear portion 72 is formed so as to extend into the housing 33 from an opening 72a formed in the outer peripheral surface 33a. The linear portion 72 communicates with the introduction path 71 in the vicinity of the tip 72 b of the linear portion 72 extending into the housing 33. An internal thread is formed in the vicinity of the opening 72a of the linear portion 72.

  The straight portion 72 is arranged on a straight line that does not pass through the center C of the housing 33. In other words, the straight portion 72 is arranged on a straight line that does not pass through the axis of the crankshaft 60. Further, in plan view, the opening 72 a of the linear portion 72 and the tip 72 b of the linear portion 72 are arranged on the opposite side with respect to the center C of the housing 33. In other words, when a straight line perpendicular to the straight part 72 is drawn from the center of the housing 33 in plan view, the straight line intersects the straight part 72.

  The linear portion 72 is formed such that its length L1 extends longer than half of the outer diameter D2 of the housing 33 (the radius of the housing 33). Further, the linear portion 72 is formed so that its length L1 extends longer than half of the outer diameter D1 of the movable side end plate 321 of the movable scroll 32 (the radius of the movable side end plate 321).

  A flow restricting member 40 is inserted into the linear portion 72 and is fixed to the housing 33. By inserting the flow restricting member 40 into the straight part 72, a spiral oil passage 72 c is formed in the straight part 72. The spiral oil passage 72c functions as a throttle portion that adjusts the pressure (flow rate) of the oil O supplied to the oil groove 313b. The flow restriction member 40 will be described below.

  The flow restricting member 40 is a rod-shaped member as shown in FIG. The flow restricting member 40 includes a main body 41 disposed at one end, a small diameter portion 42 provided continuously with the main body 41, a screw portion 43 provided on the opposite side of the main diameter 41 of the small diameter portion 42, and a screw portion 43. The large-diameter portion 44 is provided on the opposite side of the small-diameter portion 42.

  The length L2 of the flow restricting member 40 (the length from the tip of the main body 41 to the boundary between the screw portion 43 and the large diameter portion 44) is substantially equal to the length L1 of the linear portion 72. More precisely, the length L2 of the flow restricting member 40 is slightly shorter than the length L1 of the linear portion 72. The length L2 of the flow restricting member 40 is longer than half of the outer diameter D2 of the housing 33 and longer than half of the outer diameter D1 of the movable side end plate 321 of the movable scroll 32.

  On the outer peripheral surface of the main body 41, a spiral groove 41a that is spirally continuous is formed as shown in FIG. By this spiral groove 41a, a spiral oil passage 72c is formed in the straight portion 72 into which the flow restricting member 40 is inserted. In the spiral oil passage 72c, the oil O flows through the spiral groove 41a of the flow restricting member 40 having a small flow path area, so that the high-pressure oil O in the crank chamber 37 is decompressed when passing through the spiral oil passage 72c. And the flow rate is adjusted. As a result, the oil groove 313b formed in the thrust surface 313a of the peripheral edge 313 of the fixed scroll 31 is supplied with a predetermined amount of oil O having a pressure lower than that of the crank chamber 37 (sub-high pressure). The length of the main body 41 of the flow restriction member 40, the size of the diameter of the main body 41, the shape of the spiral groove 41a of the main body 41, and the like are set in the oil groove 313b formed in the peripheral edge 313 of the fixed scroll 31 (movable scroll). It is determined so that an appropriate amount of oil O can be sent to the sliding contact surface 321b of the 32 movable side end plates 321). For example, the diameter (outer diameter) of the main body 41 may be larger than the thickness of the movable side end plate 321 of the movable scroll 32.

  The screw portion 43 is formed with a male screw that is screwed with a female screw formed in the vicinity of the opening 72 a of the linear portion 72.

  The large diameter portion 44 is formed larger than the diameter of the linear portion 72 and constitutes an end portion on the opposite side of the main body 41 of the flow restricting member 40.

  The flow restricting member 40 is inserted into the opening 72a of the linear portion 72 from the main body 41 side. When the flow restricting member 40 is inserted, the female screw formed in the vicinity of the opening 72a of the linear portion 72 and the male screw of the screw portion 43 are screwed together, and in the state shown in FIG. The housing 33 is fixed. In a state where the flow restricting member 40 and the housing 33 are fixed, the oil O flowing in the straight portion 72 does not flow out from the opening 72 a of the straight portion 72.

  In the state where the flow restricting member 40 and the housing 33 are fixed, a notch in which the large diameter portion 44 is accommodated in the housing 33 so that the large diameter portion 44 of the flow restricting member 40 does not contact the cylindrical member 21 of the casing 20. Is formed. Therefore, even if the flow restricting member 40 is inserted into the housing 33, the press-fitting of the housing 33 into the cylindrical member 21 is not hindered.

  As shown in FIG. 4, the housing side communication path 73 is a hole formed so as to extend in the vertical direction in the housing 33 (in the axial direction of the crankshaft 60). The housing side communication path 73 is a path for supplying the oil O whose flow rate has been adjusted in the spiral oil path 72 c to the fixed scroll side communication path 80.

The upper end of the housing side communication path 73 opens at the upper end surface of the housing 33. The opening at the upper end of the housing side communication path 73 communicates with the opening at the lower end of the first vertical path 81 of the fixed scroll side communication path 80.

  The housing side communication path 73 communicates with the linear portion 72 on the lower end side. Specifically, the housing side communication path 73 communicates with a portion of the straight portion 72 where the small diameter portion 42 of the flow restricting member 40 is disposed.

(2-3) Drive Motor The drive motor 50 is an example of a drive unit. The drive motor 50 includes an annular stator 51 fixed to the inner wall surface of the cylindrical member 21, and a rotor 52 that is rotatably accommodated with a slight gap (air gap passage) inside the stator 51.

  The rotor 52 is connected to the movable scroll 32 via a crankshaft 60 arranged so as to extend in the vertical direction along the axial center of the cylindrical member 21. The drive motor 50 causes the movable scroll 32 to revolve periodically with respect to the fixed scroll 31 by rotating the rotor 52. As a result, the gas refrigerant in the compression chamber 35 of the compression mechanism 30 is compressed.

(2-4) Crankshaft The crankshaft 60 transmits the driving force of the drive motor 50 to the movable scroll 32. The crankshaft 60 is disposed so as to extend in the vertical direction along the axial center of the cylindrical member 21, and connects the rotor 52 of the drive motor 50 and the movable scroll 32 of the compression mechanism 30.

  The crankshaft 60 has a main shaft 62 whose center axis coincides with the axis of the cylindrical member 21, and an eccentric portion 61 that is eccentric with respect to the axis of the cylindrical member 21.

  The eccentric portion 61 is connected to the boss portion 323 of the movable scroll 32 as described above.

  The main shaft 62 is rotatably supported by a bearing metal 334 of the bearing housing portion 333 of the housing 33 and a lower bearing 65 described later. The main shaft 62 is connected to the rotor 52 of the drive motor 50 between the bearing housing portion 333 and the lower bearing 65.

  As shown in FIG. 1, an oil supply path 63 for supplying oil O for lubrication to the compression mechanism 30 and the like is formed inside the crankshaft 60.

  The oil supply path 63 extends vertically in the crankshaft 60 from the lower end to the upper end of the crankshaft 60. The oil supply path 63 opens at the upper and lower ends of the crankshaft 60. In addition, an opening (not shown) is formed in the oil supply path 63 so as to face the inner surface of the bearing metal 334 disposed in the bearing housing portion 333.

  A positive displacement oil pump 64 is provided at the lower end opening of the oil supply path 63. The oil supply pump 64 sucks up the high-pressure oil O in the oil sump space 26 and supplies the oil O to the oil supply path 63.

  The oil O flowing through the oil supply path 63 and flowing out from the upper end opening of the oil supply path 63 flows into the crank chamber 37 after lubricating the sliding part between the eccentric part 61 of the crankshaft 60 and the boss part 323 of the movable scroll 32. .

  The oil O flowing through the oil supply path 63 and flowing out from the opening formed to face the inner surface of the bearing metal 334 disposed in the bearing housing portion 333 lubricates the sliding portion between the main shaft 62 and the bearing metal 334. Then, it flows into the crank chamber 37 through the bearing housing part oil passage 333a or from the upper end of the bearing metal 334.

(2-5) Lower Bearing The lower bearing 65 is disposed below the drive motor 50. The lower bearing 65 is fixed to the cylindrical member 21. The lower bearing 65 constitutes a bearing on the lower end side of the crankshaft 60 and rotatably supports the main shaft 62 of the crankshaft 60.

(3) Operation of Scroll Compressor The operation of the scroll compressor 10 will be described.

(3-1) Compression Operation When the drive motor 50 is driven, the rotor 52 rotates and the crankshaft 60 connected to the rotor 52 also rotates. When the crankshaft 60 rotates, the movable scroll 32 revolves with respect to the fixed scroll 31 without rotating due to the action of the Oldham coupling 34. Then, the low-pressure (suction pressure) gas refrigerant is sucked into the casing 20 through the suction pipe 23. More specifically, the low-pressure gas refrigerant is sucked from the suction pipe 23 to the compression chamber 35 from the peripheral side of the compression chamber 35. As the movable scroll 32 revolves, the suction pipe 23 and the compression chamber 35 are not in communication with each other, and the pressure in the compression chamber 35 increases as the volume of the compression chamber 35 decreases. As the gas refrigerant moves from the peripheral compression chamber 35 to the central compression chamber 35, the pressure rises and finally becomes a high pressure (discharge pressure). The pressure of the gas refrigerant in the peripheral compression chamber 35 is an intermediate value between the suction pressure and the discharge pressure. The high-pressure gas refrigerant compressed by the compression mechanism 30 is discharged from the discharge port 311b located near the center of the fixed side end plate 311. Thereafter, the high-pressure gas refrigerant passes through a refrigerant passage (not shown) formed in the fixed scroll 31 and the housing 33 and flows into the first space S1. After the scroll compressor 10 is started, the pressure in the first space S1 gradually increases and becomes substantially equal to the discharge pressure in a steady state. The gas refrigerant in the first space S1 is discharged from the discharge pipe 24.

  Next, the pressure in the crank chamber 37 and the back pressure space 36 during operation of the scroll compressor 10 will be described.

  First, the pressure in the crank chamber 37 will be described. Since the oil O is supplied to the crank chamber 37 from the oil reservoir space 26, the pressure in the crank chamber 37 becomes substantially equal to the pressure in the oil reservoir space 26. The oil sump space 26 communicates with the first space S1, and therefore has the same pressure as the first space S1. That is, the oil sump space 26 normally stores high-pressure (discharge pressure) oil O. Therefore, the crank chamber 37 to which the oil O is supplied from the oil sump space 26 is also usually at a high pressure (substantially discharge pressure).

  Next, the pressure in the back pressure space 36 will be described. When the movable scroll 32 revolves, the communication groove 313d formed in the thrust surface 313a of the peripheral edge 313 of the fixed scroll 31 and the communication hole 321d formed in the movable side end plate 321 of the movable scroll 32 are in one revolution cycle. Communicate for a predetermined period (including the case of constant communication). As a result, the compression chamber 35 located on the peripheral side and the back pressure space 36 communicate with each other through the communication hole 321d of the movable side end plate 321 and the communication groove 313d of the peripheral portion 313 for a predetermined period in one revolution cycle. To do. As a result, the pressure in the back pressure space 36 is an intermediate pressure between the suction pressure and the discharge pressure.

(3-2) Oil Supply Operation When the crankshaft 60 rotates, the oil O in the oil sump space 26 flows upward to the opening at the upper end of the crankshaft 60 through the oil supply path 63 and flows out from the opening. A part of the oil O flowing through the oil supply path 63 flows out from an opening (not shown) formed so as to face the inner surface of the bearing metal 334 provided in the bearing housing portion 333. The oil O flowing out from the upper end opening of the oil supply path 63 lubricates the sliding portion between the eccentric portion 61 and the boss portion 323 and then flows into the crank chamber 37, and the oil O is stored in the crank chamber 37. The oil O flowing out from the opening formed so as to face the inner surface of the bearing metal 334 lubricates the sliding portion between the main shaft 62 and the bearing metal 334 and then flows into the crank chamber 37, and the oil O flows into the crank chamber 37. Stored inside.

  The oil O stored in the crank chamber 37 is caused by a differential pressure between the crank chamber 37 and the compression chamber 35 in the vicinity of the oil groove 313 b formed in the thrust surface 313 a of the peripheral edge 313 of the fixed scroll 31. Then, the oil is supplied to the oil groove 313b through the fixed scroll side communication passage 80. The flow rate of the oil O supplied to the oil groove 313b is adjusted to a predetermined amount by a spiral oil passage 72c formed in the straight portion 72 of the oil passage 70. At this time, since the oil O is depressurized in the spiral oil passage 72c, the pressure of the oil O supplied to the oil groove 313b is a quasi-high pressure slightly lower than the high pressure (discharge pressure).

(4) Features (4-1)
The scroll compressor 10 of this embodiment includes a fixed scroll 31, a movable scroll 32, a drive motor 50, and a housing 33. The fixed scroll 31 has a thrust surface 313a. The movable scroll 32 has a disc-shaped movable side end plate 321 having a sliding contact surface 321 b that is in sliding contact with the thrust surface 313 a and a boss portion 323 extending from the back surface 321 c of the movable side end plate 321. The compression chamber 35 is formed. The drive motor 50 is connected to the boss portion 323 of the movable scroll 32 via the crankshaft 60. The drive motor 50 rotates the movable scroll 32 to compress the gas refrigerant in the compression chamber 35. The housing 33 is formed with a crank chamber 37 in which the boss portion 323 is disposed. A hole (oil passage 70) for supplying oil O from the crank chamber 37 to the sliding contact surface 321 b of the movable scroll 32 is formed in the housing 33. The oil passage 70 includes a straight portion 72 that extends into the housing 33 from the opening 72 a of the outer peripheral surface 33 a of the housing 33. A flow rate restricting member 40 as a rod-like member having a spiral groove 41a formed on the outer peripheral surface is inserted into the linear portion 72, and a spiral oil passage 72c is formed.

  Here, the linear portion 72 for inserting the flow restricting member 40 having the spiral groove 41a formed in the outer peripheral surface thereof extends from the opening 72a of the outer peripheral surface 33a of the housing 33 into the housing 33 in which the crank chamber 37 is formed. Therefore, the degree of freedom of the size (diameter and length) of the flow restricting member 40 is high. Therefore, a spiral oil passage 72c having a sufficient length can be formed in the straight portion 72. As a result, the flow rate of the oil O is appropriately adjusted by the spiral oil passage 72c, and excess oil O can be prevented from being supplied to the sliding contact surface 321b of the movable scroll 32. Further, since the spiral oil passage 72c having a sufficient length can be formed, it is not necessary to excessively reduce the passage area of the spiral groove 41a of the flow restriction member 40 in order to suppress the supply amount of the oil O. The blockage of the spiral oil passage 72c can be suppressed. As a result, the scroll compressor 10 with high efficiency and high reliability can be realized.

(4-2)
In the scroll compressor 10 of the present embodiment, the length L2 of the flow restriction member 40 is longer than half of the outer diameter D1 of the movable side end plate 321 of the movable scroll 32.

  Here, since the flow restricting member 40 longer than half of the outer diameter D1 of the movable side end plate 321 of the movable scroll 32 is inserted into the housing 33, the spiral shape is longer than when the flow restricting member 40 is inserted into the movable scroll 32. An oil passage 72c can be formed. Therefore, it is easy to appropriately adjust the flow rate of the oil O by the spiral oil passage 72c while suppressing the blockage of the spiral oil passage 72c.

(4-3)
In the scroll compressor 10 of the present embodiment, the linear portion 72 extends in the horizontal direction. In other words, the straight portion 72 extends in the horizontal direction longer than the axial direction of the crankshaft 60.

  Here, by forming the spiral oil passage 72c extending in the horizontal direction, the flow rate of the oil O can be appropriately adjusted by the spiral oil passage 72c while suppressing the blockage of the spiral oil passage 72c. .

(4-4)
In the scroll compressor 10 of the present embodiment, the opening 72 a of the linear portion 72 and the tip 72 b of the linear portion 72 extending into the housing 33 are arranged on the opposite side with respect to the center C of the housing 33 in plan view. .

  Here, since the opening 72a and the distal end 72b of the linear portion 72 are arranged on the opposite side with respect to the center C of the housing 33, the length of the linear portion 72 can be increased, and the spiral oil passage 72c is formed. Can be formed long. Therefore, it is easy to appropriately adjust the flow rate of the oil O by the spiral oil passage 72c while suppressing the blockage of the spiral oil passage 72c.

(4-5)
In the scroll compressor 10 of the present embodiment, the fixed scroll 31 communicates with the oil passage 70 and is connected to the fixed scroll side for supplying the oil O supplied from the oil passage 70 to the sliding contact surface 321b of the movable scroll 32. A passage 80 is formed.

  Here, the oil O can be supplied to a desired position of the sliding contact surface 321 b of the movable scroll 32 through the fixed scroll side communication path 80 of the fixed scroll 31.

(4-6)
In the scroll compressor 10 of the present embodiment, the linear portion 72 is arranged on a straight line that does not pass through the axis of the crankshaft 60 in plan view.

  Here, since it is possible to form the straight part 72 longer than the radius of the housing 33 (half of the outer diameter D2 of the housing 33), a sufficiently long spiral oil passage 72c is formed, and the spiral oil is formed. It is easy to appropriately adjust the flow rate of the oil O by the spiral oil passage 72c while suppressing the blockage of the passage 72c.

(5) Modifications The above embodiment can be modified as appropriate without departing from the spirit of the present invention.

  Below, the modification of this embodiment is shown. A plurality of modified examples may be appropriately combined.

(5-1) Modification A
In the above-described embodiment, only one straight portion 72 is formed in the oil passage 70, but two or more straight portions 72 may be formed.

  For example, as shown in FIG. 7, the oil passage 170 is formed as a straight portion on the straight portion 172 (first straight portion) extending from the opening 172 a formed on the outer peripheral surface 33 a of the housing 33 and the outer peripheral surface 33 a of the housing 33. And a straight portion 172 ′ (second straight portion) extending from the opened opening 172a ′. At this time, the flow restricting member includes a flow restricting member 140 (first rod-like member) and a flow restricting member 140 '(second rod-like member). The straight portion 172 'communicates with the vicinity of the tip 172b of the straight portion 172 extending from the opening 172a in the vicinity of the opening 172a' (near the small diameter portion 142 'of the flow restricting member 140' inserted into the straight portion 172 '). A flow restriction member 140 and a flow restriction member 140 ′ are inserted into the straight portion 172 and the straight portion 172 ′, respectively, and a spiral oil passage 172c (first spiral oil passage) and a spiral oil passage 172c ′ (second portion). A spiral oil passage) is formed.

  As shown in FIG. 7, the end portion of the introduction path 71 on the outer peripheral surface 33a side of the housing 33 communicates with the straight portion 172 'in the vicinity of the tip 172b' of the straight portion 172 '. The housing side communication path 73 communicates with the portion where the small diameter portion 142 of the flow rate restricting member 140 of the linear portion 172 is disposed on the lower end side, and communicates with the fixed scroll side communication path 80 on the upper end side.

  Here, since the oil O that has passed through both the spiral oil passage 172c and the spiral oil passage 172c ′ is supplied to the sliding contact surface 321b of the movable scroll 32, the oil O is sufficiently contained in one spiral oil passage. Even when the flow rate cannot be suppressed, the flow rate of the oil O as a whole can be adjusted appropriately.

  The flow restriction member 140 and the flow restriction member 140 'are members having the same structure as the flow restriction member 40 of the above embodiment. The flow restricting member 140 and the flow restricting member 140 ′ may have the same shape and size, or may have different shapes and sizes. The straight portion 172 and the straight portion 172 'may be formed in accordance with the shape and size of the flow restricting member 140 and the flow restricting member 140'.

(5-2) Modification B
In the above-described embodiment, only one straight portion 72 is formed in the oil passage 70, but two or more straight portions 72 may be formed.

  For example, unlike the modification A, as shown in FIG. 8, the oil passage 270 includes a straight portion 272 (third straight portion) extending from an opening 272 a (third opening) formed in the outer peripheral surface 33 a of the housing 33, and It may be formed so as to include a straight portion 272 ′ (fourth straight portion) that extends from an opening 272a ′ (fourth opening) formed in the outer peripheral surface 33a of the housing 33 and does not communicate with the straight portion 272. At this time, the flow restricting member includes a flow restricting member 240 (third rod-like member) and a flow restricting member 240 '(fourth rod-like member). A flow restriction member 240 and a flow restriction member 240 ′ are inserted into the straight portion 272 and the straight portion 272 ′, respectively, and a spiral oil passage 272c (third spiral oil passage) and a spiral oil passage 272c ′ (fourth). A spiral oil passage) is formed.

  As shown in FIG. 8, the end portion of the introduction path 71 on the outer peripheral surface 33 a side of the housing 33 communicates with the straight portion 272 in the vicinity of the tip 272 b of the straight portion 272. The end portion of the introduction path 71 ′ on the outer peripheral surface 33 a side of the housing 33 communicates with the straight portion 272 ′ in the vicinity of the tip 272 b ′ of the straight portion 272 ′.

  Here, a plurality of (here, two) spiral oil passages 272c and 272c ′ that are not in communication with each other are formed, and the oil O that has passed through the spiral oil passages 272c and 272c ′ is applied to the sliding contact surface 321b of the movable scroll 32. Since it is supplied, it is easy to supply the oil O to a plurality of locations on the sliding contact surface 321b.

  The flow restriction member 240 and the flow restriction member 240 'are members having the same structure as the flow restriction member 40 of the above embodiment. The flow restricting member 240 and the flow restricting member 240 'may have the same shape and size, or may have different shapes and sizes. The straight portion 272 and the straight portion 272 'may be formed in accordance with the shape and size of the flow restricting member 240 and the flow restricting member 240'.

(5-3) Modification C
In the above embodiment, the straight portion 72 communicates with the crank chamber 37 via the introduction path 71, but the straight portion 72 may communicate directly with the crank chamber 37.

  For example, as shown in FIG. 9, the oil passage 370 may have a straight portion 372 ′ that extends into the housing 33 from the opening 372 a ′ of the outer peripheral surface 33 a of the housing 33 and communicates directly with the crank chamber 37. Further, similarly to the modified example A, the straight portion 372 ′ is formed to communicate with the straight portion 372 extending into the housing 33 from the opening 372 a of the outer peripheral surface 33 a of the housing 33 and in the vicinity of the tip 372 b of the straight portion 372. Also good. Spiral oil passages 372c and 372c 'may be formed by inserting flow restricting members 340 and 340' in the respective straight portions 372 and 372 '. The flow restriction member 340 and the flow restriction member 340 'are members having the same structure as the flow restriction member 40 of the above embodiment.

(5-4) Modification D
In the said embodiment, although the linear part 72 is extended in a horizontal direction, it is not limited to this.

  For example, as shown in FIG. 10, the straight portion 472 of the oil passage 470 extends obliquely in the housing 33 from the opening 472 a of the outer peripheral surface 33 a of the housing 33 (the tip 472 b of the straight portion 472 is arranged obliquely downward. May be formed). In other words, the straight portion 472 of the oil passage 470 may be formed to extend in the horizontal direction and also in the vertical direction (the axial direction of the crankshaft 60). The spiral oil passage 472c may be formed by inserting the flow rate restricting member 440 into the straight portion 472. The flow restricting member 440 and the flow restricting member are members having the same structure as the flow restricting member 40 of the above embodiment.

  Here, since the straight portion 472 extends in the vertical direction, the straight portion 472 that is longer than the straight portion that extends only in the horizontal direction can be formed.

(5-5) Modification E
In the above embodiment, the back pressure space 36 communicating with the compression chamber 35 having a pressure intermediate between the suction pressure and the discharge pressure is formed on the back side of the movable scroll 32. However, the present invention is not limited to this. is not. For example, the scroll compressor may be a so-called high-low pressure scroll compressor in which a back pressure chamber is not formed on the back side of the movable scroll.

(5-6) Modification F
In the above-described embodiment, the oil O in the crank chamber 37 is supplied to the sliding contact surface 321b of the movable side end plate 321 of the movable scroll 32 via the oil passage 70. However, the present invention is not limited to this. The oil O in the vicinity of may be supplied to the sliding contact surface 321b.

  For example, the oil passage 70 may be formed so that the oil O flowing through the bearing housing oil passage 333a is supplied to the sliding contact surface 321b.

  The present invention is applicable to a scroll compressor that supplies oil to a sliding portion between a movable scroll and a fixed scroll via an oil passage.

DESCRIPTION OF SYMBOLS 10 Scroll compressor 31 Fixed scroll 313a Thrust surface 32 Movable scroll 321 End plate 321b Sliding contact surface 321c Back surface 323 Boss portion 33 Housing 33a Outer peripheral surface 35 Compression chamber 37 Crank chamber 40, 440 Flow restriction member (bar-shaped member)
140,340 Flow rate limiting member (first rod-shaped member)
140 ', 340' Flow rate limiting member (second rod-shaped member)
240 Flow rate limiting member (third rod-shaped member)
240 'Flow rate limiting member (fourth rod-shaped member)
41a Spiral groove 50 Drive motor (drive part)
60 Crankshaft 70, 170, 270, 370, 470 Oil passage (hole)
72,472 Straight portion 172,372 Straight portion (first straight portion)
172 ', 372' straight part (second straight part)
272 Straight part (third straight part)
272 'straight part (fourth straight part)
72a, 472a opening 172a, 372a opening (first opening)
172a ′, 372a ′ opening (second opening)
272a opening (third opening)
272a 'opening (fourth opening)
72b, 172b, 172b ′, 272b, 272b ′, 372b, 472b Tip 72c, 472c Spiral oil passage 172c, 372c Spiral oil passage (first spiral oil passage)
172c ', 372c' spiral oil passage (second spiral oil passage)
272c Spiral oil passage (third spiral oil passage)
272c ′ spiral oil passage (fourth spiral oil passage)
80 Fixed scroll side communication path (communication path)
C Center of housing D1 Outer diameter L2 of movable side end plate Length of flow restriction member O Oil

JP 2004-60532 A

Claims (9)

A fixed scroll (31) having a thrust surface (313a);
A disc-shaped end plate (321) having a sliding contact surface (321b) in sliding contact with the thrust surface, and a boss portion (323) extending from the back surface (321c) of the end plate, and between the fixed scroll A movable scroll (32) forming a compression chamber (35);
A drive unit (50) connected to the boss portion of the movable scroll via a crankshaft (60), rotating the movable scroll and compressing fluid in the compression chamber;
A housing (33) formed with a crank chamber (37) in which the boss portion is disposed;
With
Holes (70, 170, 270, 370, 470) serving as oil passages for supplying oil (O) from the vicinity of the crank chamber to the sliding contact surface are formed in the housing,
The holes are straight portions (72, 172, 172 ′, 272) extending into the housing from openings (72a, 172a, 172a′272a, 272a ′, 372a, 372a ′, 472a) of the outer peripheral surface (33a) of the housing. , 272 ', 372, 372', 472)
A rod-like member (40, 140, 140 ′, 240, 240 ′, 340, 340 ′, 440) having a spiral groove (41a) formed on the outer peripheral surface is inserted into the straight portion, and a helical oil passage (72c) is inserted. , 172c, 172c ′, 272c, 272c ′, 372c, 372c ′, 472c),
Scroll compressor (10). The length (L2) of the rod-shaped member (40, 140, 140 ′, 240, 240 ′, 340, 440) is longer than half of the outer diameter (D1) of the end plate,
The scroll compressor according to claim 1. The linear portion extends longer in the horizontal direction than the axial direction of the crankshaft.
The scroll compressor according to claim 1 or 2. In plan view, the openings (72a, 172a, 172a′272a, 272a ′, 372a, 472a) and the straight portions (72, 172, 172 ′, 272, 272 ′, 372, 472) extending into the housing The tip (72b, 172b, 172b ′, 272b, 272b ′, 372b, 472b) is arranged on the opposite side to the center (C) of the housing.
The scroll compressor in any one of Claim 1 to 3. The straight portion includes a first straight portion (172, 372) extending from a first opening (172a, 372a) formed in the outer peripheral surface of the housing and a second opening (formed in the outer peripheral surface of the housing). 172a ′, 372a ′) extending from the second straight line portion (172 ′, 372 ′),
The bar-shaped member includes a first bar-shaped member (140, 340) and a second bar-shaped member (140 ′, 340 ′),
The second straight portion communicates with the vicinity of the tip (172b, 372b) of the first straight portion extending from the first opening in the vicinity of the second opening,
The first linear member and the second linear member are inserted into the first linear portion and the second linear portion, respectively, and a first helical oil passage (172c, 372c) and a second helical oil passage ( 172c ′, 372c ′) are formed,
The scroll compressor in any one of Claim 1 to 4. The straight portion includes a third straight portion (272) extending from a third opening (272a) formed in the outer peripheral surface of the housing and a fourth opening (272a ′) formed in the outer peripheral surface of the housing. A fourth straight portion (272 ') that extends and does not communicate with the third straight portion,
The bar-shaped member includes a third bar-shaped member (240) and a fourth bar-shaped member (240 ′),
The third rod-like member and the fourth rod-like member are inserted into the third straight portion and the fourth straight portion, respectively, and a third spiral oil passage (272c) and a fourth spiral oil passage (272c ′) are inserted. ) Is formed,
The scroll compressor in any one of Claim 1 to 4. The straight portion (472) extends in the horizontal direction and also in the vertical direction.
The scroll compressor according to claim 1. In the fixed scroll, a communication path (80) for communicating with the hole and supplying oil supplied from the hole to the sliding contact surface is formed.
The scroll compressor according to claim 1. The straight portions (72, 172, 172 ′, 272, 272 ′, 372, 372 ′, 472) are arranged on a straight line that does not pass through the axis of the crankshaft in plan view.
The scroll compressor according to claim 1.

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