JP5683120B2 - Scroll compressor - Google Patents

Description

  The present invention relates to a scroll compressor.

  The scroll compressor includes a fixed scroll and a orbiting scroll that are formed by meshing spiral wraps provided on the inner surfaces of the opposing end plates, a rotating shaft that drives the orbiting scroll, and a rotating scroll by rotating the rotating shaft. A rotation preventing member that revolves while preventing rotation, a turning scroll that revolves and a frame that supports the rotation preventing member are provided.

  The frame includes a bearing hole for inserting and supporting the rotating shaft, a thrust part for slidably supporting the orbiting scroll on the end face of the convex part projecting in an annular shape on the outer periphery of the bearing hole, and an outer periphery of the convex part. And an accommodating recess for accommodating a rotation prevention member formed in an annular shape. The rotation prevention member has a key that is inserted into a key groove formed on the outer surface of the end plate of the orbiting scroll and a key that is inserted into a key groove formed in the bottom of the housing recess of the frame. Moreover, the rotating shaft has an oil supply hole for guiding lubricating oil to the inside of the convex portion of the frame. That is, the lubricating oil guided to the inside of the convex portion of the frame reaches the end surface of the convex portion and is supplied between the thrust portion and the orbiting scroll, and from the end surface of the convex portion to the outer periphery of the convex portion, Supplied to the rotation prevention member.

  Conventionally, for example, a scroll compressor (scroll fluid machine) described in Patent Document 1 includes an annular oil supply groove between an inner peripheral edge and an outer peripheral edge in the thrust portion (end surface of the convex portion) described above. An outflow groove that faces the outer peripheral edge from the oil supply groove and an inflow groove that faces the inner peripheral edge from the oil supply groove are provided. These outflow grooves and inflow grooves assist in supplying an appropriate amount of lubricating oil to the thrust portion.

Japanese Patent Laid-Open No. 5-240175

  However, in the scroll compressor described in Patent Document 1 described above, for example, during low-speed operation, the amount of lubricating oil guided to the inside of the convex portion of the frame is reduced, so that the key formed at the bottom portion of the accommodating concave portion There is a risk that the lubricant will not be sufficiently distributed in the groove. In this case, it is assumed that the key of the rotation preventing member is worn due to the sliding resistance with respect to the key groove. When the key of the rotation preventing member is worn, the center of the orbiting scroll is displaced, and the compression performance may be deteriorated due to compression leakage between the laps or contact between the side surfaces of the laps.

  The present invention solves the above-described problems, and an object of the present invention is to provide a scroll compressor that can supply an appropriate amount of lubricating oil to the rotation prevention member.

  In order to achieve the above-described object, a scroll compressor according to the present invention includes a fixed scroll in which a spiral fixed side wrap is provided on the inner surface of a fixed side end plate, and the fixed scroll fixed to the inner surface of the movable side end plate. An orbiting scroll provided with a spiral movable side wrap meshed with the side wrap, a rotation preventing member for revolving orbiting the orbiting scroll while preventing the orbiting scroll from rotating, and an oil receiving portion to which lubricating oil is supplied An end surface projecting in an annular shape on the outer periphery of the orbiting surface faces the outer surface of the movable side end plate of the orbiting scroll and has a thrust portion that slidably supports the orbiting scroll, and on the outer periphery of the thrust portion In a scroll compressor comprising a key groove for inserting a key of the rotation prevention member, an intermediate groove formed in an annular shape along an annular shape of the surface of the thrust part, Serial end at outer annular said intermediate grooves in the surface of the thrust portion, characterized in that the other end abuts on the intermediate grooves and a stretched outer groove reaches on the keyway.

  According to this scroll compressor, since the lubricating oil is stored in the thrust portion by the intermediate groove and then the lubricating oil is supplied to the key groove by the outer groove, an appropriate amount of lubricating oil can be supplied to the rotation prevention member. it can.

  Further, in the scroll compressor according to the present invention, one end abuts the intermediate groove on the inner side of the intermediate groove on the surface of the thrust part, the other end extends to the inner peripheral edge of the thrust part, and one end is the An inner groove is provided that is displaced in the circumferential direction of the intermediate groove with respect to one end of the outer groove.

  According to this scroll compressor, the supply of lubricating oil to the intermediate groove is assisted by the inner groove, so that the lubricating oil supplied to the key groove by the outer groove can be replenished to the intermediate groove. Moreover, since the inner groove is configured to communicate with only the intermediate groove without directly communicating with the outer groove, the lubricating oil is supplied to the outer groove via the intermediate groove. An excessive supply of lubricating oil to the keyway can be prevented.

  In the scroll compressor of the present invention, the inner groove is formed to be inclined with respect to the radial direction of the intermediate groove with one end directed in the turning direction of the orbiting scroll.

  According to this scroll compressor, the flow rate of the lubricating oil is increased and flows into the intermediate groove with the turning of the orbiting scroll, so that the supply amount of the lubricating oil can be increased, which is particularly effective during low-speed operation.

  In the scroll compressor of the present invention, the inner groove is formed to be inclined with respect to the radial direction of the intermediate groove with one end directed in the direction opposite to the turning direction of the orbiting scroll. .

  According to this scroll compressor, the flow rate of the lubricating oil can be reduced with the turning of the orbiting scroll, and the situation where the lubricating oil excessively flows into the intermediate groove can be prevented, which is particularly effective during high-speed operation.

  Further, in the scroll compressor according to the present invention, the outer groove is formed with the other end directed to a position where the key of the rotation preventing member contacts the key groove by the turning of the orbiting scroll. .

  According to the scroll compressor, it is possible to effectively prevent the wear of the key by positively supplying the lubricating oil to the portion of the rotation preventing member that is in contact with the key groove.

  In the scroll compressor according to the present invention, a passage area of the outer groove is formed larger than a passage area of the inner groove.

  According to this scroll compressor, the outer groove side which is the outer side of the orbiting scroll has a lower pressure than the inner groove side which is the inner side of the orbiting scroll and the lubricating oil expands, so that the lubricating oil can be smoothly distributed. It is possible to obtain the effect of supplying an appropriate amount of lubricating oil to the rotation prevention member.

  According to the present invention, an appropriate amount of lubricating oil can be supplied to the rotation prevention member.

FIG. 1 is a schematic cross-sectional view of a scroll compressor according to an embodiment of the present invention. FIG. 2 is a plan view of a frame in the scroll compressor shown in FIG. 3 is a cross-sectional view taken along line AA in FIG. FIG. 4 is a plan view of a frame showing another example of the inner groove. FIG. 5 is a plan view of a frame showing another example of the inner groove. FIG. 6 is a plan view of a frame showing another example of the outer groove.

  Embodiments according to the present invention will be described below in detail with reference to the drawings. Note that the present invention is not limited to the embodiments. In addition, constituent elements in the following embodiments include those that can be easily replaced by those skilled in the art or those that are substantially the same.

  FIG. 1 is a schematic cross-sectional view of a scroll compressor according to the present embodiment. A scroll compressor 1 shown in FIG. 1 is a multistage compressor applied to an air conditioner or the like, and includes a main scroll compression mechanism portion of the present embodiment on the high stage side, and rotary compression on the low stage side. A mechanism part is provided. In addition, as a scroll compressor provided with the scroll compression mechanism part which becomes the main of this Embodiment, the thing provided with the scroll compression mechanism part of a single stage, or provided with the scroll compression mechanism part on the high stage side and the low stage side It may be.

  As shown in FIG. 1, the scroll compressor 1 includes a housing 2, a drive unit 3, a rotary compression mechanism unit 4, and a scroll compression mechanism unit 5.

  The casing 2 has a substantially cylindrical shape whose top and bottom are sealed, and a drive unit 3, a rotary compression mechanism unit 4, and a scroll compression mechanism unit 5 are accommodated therein. The casing 2 is arranged with its cylinder vertically set up, and a discharge pipe 21 is provided on the top thereof. Further, the bottom of the housing 2 is configured as an oil reservoir 22 in which the lubricating oil L is stored.

  The drive unit 3 is a slot motor, and includes a stator 31, a rotor 32, and a rotation shaft 33. The stator 31 is fixed to the inner wall surface at substantially the center in the vertical direction of the housing 2. The rotor 32 is provided so as to be rotatable with respect to the stator 31. The rotating shaft 33 is attached to the rotor 32 and is provided in such a manner that its own axis extends in the vertical direction. The rotary shaft 33 has a lower end connected to the low-stage rotary compression mechanism 4 and an upper end connected to the high-stage scroll compression mechanism 5. In the drive unit 3, the rotating shaft 33 rotates when power is supplied from the outside of the housing 2 through a wiring (not shown).

  The rotating shaft 33 is provided such that the lower end thereof reaches the oil reservoir 22 of the housing 2. An oil supply hole 331 is provided inside the rotation shaft 33. The oil supply hole 331 is provided along the axis of the rotation shaft 33 and includes a branch hole (not shown) that communicates with the rotary compression mechanism unit 4 and the scroll compression mechanism unit 5. Further, the lower end of the rotating shaft 33 is connected to an oil supply pump 6 disposed in the oil reservoir 22. The oil supply pump 6 sends the lubricating oil L into the oil supply hole 331 of the rotary shaft 33. The lubricating oil L fed into the oil supply hole 331 is supplied from the branch hole to the rotary compression mechanism unit 4 and the scroll compression mechanism unit 5.

  The rotary compression mechanism unit 4 is disposed below the drive unit 3 in the housing 2 and has a compression unit 41. The compression unit 41 includes a rotor 411 and a compression chamber 412. Further, the rotary compression mechanism unit 4 rotatably supports the rotary shaft 33 by an upper bearing 421 provided on the upper side of the compression unit 41 and a lower bearing 422 provided on the lower side of the compression unit 41. The rotor 411 is attached to a crank 332 provided at a position corresponding to the compression portion 41 of the rotating shaft 33. That is, in the rotary compression mechanism unit 4, when the power is supplied to the drive unit 3 and the rotating shaft 33 rotates, the rotor 411 rotates eccentrically in the compression chamber 412 by the crank 332, and the compression chamber is connected via the suction pipe 43. A low-pressure fluid (refrigerant gas) is sucked into 412, and this fluid is compressed in the compression chamber 412 to an intermediate pressure. The compressed fluid is discharged into the housing 2 from a discharge chamber 44 formed at the position of the upper bearing 421.

  The scroll compression mechanism unit 5 is disposed above the drive unit 3 in the housing 2 and includes a fixed scroll 51 and a turning scroll 52.

  The fixed scroll 51 has a spiral fixed side wrap 512 formed on the inner surface (the lower surface in FIG. 1) of the fixed side end plate 511 fixed to the frame 53 fixed to the housing 2. The fixed end plate 511 has a discharge hole 513 formed in the center thereof. The discharge hole 513 is opened and closed by a discharge reed valve 54 provided on the outer surface (upper surface in FIG. 1) of the fixed side end plate 511. In addition, a sealing cover 56 that forms an oil separation chamber 55 is provided on the outer surface of the fixed-side end plate 511. The discharge pipe 21 is attached to the hermetic cover 56 so as to communicate with the oil separation chamber 55.

  In the orbiting scroll 52, a spiral movable side wrap 522 is formed on the inner surface (upper surface in FIG. 1) of the movable side end plate 521 facing the inner surface of the fixed side end plate 511. Then, the movable side wrap 522 of the orbiting scroll 52 and the fixed side wrap 512 of the fixed scroll 51 are engaged with each other with the phases shifted from each other, whereby the compression divided by the end plates 511 and 521 and the wraps 512 and 522 is performed. A chamber 50 is formed. Further, the orbiting scroll 52 is formed with a guide bush 523 through which a crank pin 333 provided at the upper end of the rotary shaft 33 is inserted on the outer surface (lower surface in FIG. 1) of the movable side end plate 521. The orbiting scroll 52 is revolved while being prevented from rotating by an annular rotation preventing member 57 disposed between the orbiting scroll 52 and the frame 53. The rotation preventing member 57 revolves while revolving while preventing the rotation of the orbiting scroll 52, and the key 57 a inserted into the key groove 521 a formed on the outer surface of the movable side end plate 521 of the orbiting scroll 52 and the housing in the frame 53. And a key 57b inserted into a keyway 534a formed in the bottom of the recess 534 (see FIGS. 2 and 3).

  The scroll compression mechanism unit 5 sucks the intermediate-pressure fluid compressed by the low-stage rotary compression mechanism unit 4 and discharged into the housing 2 into the compression chamber 50. After being compressed to a high pressure state by a compression operation by revolving turning drive, it is discharged to the oil separation chamber 55 through the discharge reed valve 54. The high-pressure fluid is sent out to the outside of the housing 2, that is, to the refrigeration cycle side through the discharge pipe 21 after the lubricating oil L in the fluid is separated in the oil separation chamber 55.

  Hereinafter, the frame 53 of the scroll compression mechanism unit 5 in the scroll compressor 1 will be described with reference to the drawings. FIG. 2 is a plan view of a frame in the scroll compressor, and FIG. 3 is a cross-sectional view taken along line AA in FIG.

  The frame 53 is disposed below the orbiting scroll 52 and faces the outer surface (the lower surface in FIG. 1) side of the movable side end plate 521 of the orbiting scroll 52. The frame 53 is provided with a bearing hole 531 at the center thereof for rotatably inserting and supporting the rotary shaft 33. The frame 53 has an annular projection 532 projecting from the outer periphery of the opening of the bearing hole 531 facing the orbiting scroll 52. The projecting portion 532 is configured as a thrust portion 533 that supports the orbiting scroll 52 so that the end surface of the projecting end faces the outer surface of the movable side end plate 521 of the orbiting scroll 52. A guide bush 523 formed on the orbiting scroll 52 is accommodated in a region inside the convex portion 532. An area inside the convex portion 532 is configured as an oil receiving portion 530 that receives the lubricating oil L fed through the oil supply hole 331 of the rotating shaft 33.

  In addition, the frame 53 is formed with an annular housing recess 534 for housing the rotation prevention member 57 formed in an annular shape on the outer periphery of the convex portion 532. A key groove 534a into which the key 57b of the rotation prevention member 57 is inserted is formed at the bottom of the housing recess 534. The key 57 b of the rotation prevention member 57 is provided to face in the radial direction of the circumference of the rotation prevention member 57. The key groove 534a corresponds to the arrangement of the key 57b and is provided to face in the radial direction of the circumference of the housing recess 534.

  In addition, the frame 53 includes an intermediate groove 535, an outer groove 536, and an inner groove 537 in a thrust portion 533 formed by the protruding end surface of the convex portion 532. The intermediate groove 535 is formed in an annular shape along the annular shape of the surface of the thrust portion 533. In the outer groove 536, one end 536 a hits the intermediate groove 535 and the other end 536 b extends on the key groove 534 a on the annular outer side of the intermediate groove 535 on the surface of the thrust portion 533. In the inner groove 537, one end 537a hits the intermediate groove 535 and the other end 537b extends to the inner peripheral edge of the thrust portion 533, and one end 537a is extended to the outer groove 536 on the annular inner side of the intermediate groove 535 on the surface of the thrust portion 533. The one end 536a is displaced in the circumferential direction of the intermediate groove 535. That is, the inner groove 537 is configured to communicate with only the intermediate groove 535 without directly communicating with the outer groove 536.

  In the frame 53 described above, the lubricating oil L sent to the oil receiving portion 530 from the oil supply hole 331 of the rotating shaft 33 is rotated by the rotation of the rotating shaft 33 during the compression operation of the orbiting scroll 52 by the revolution turning drive. 523 reaches the inner wall surface of the convex portion 532 and enters the inner groove 537. Then, the lubricating oil L that has entered the inner groove 537 reaches the intermediate groove 535. The lubricating oil L in the intermediate groove 535 facilitates sliding with the thrust portion 533 when the orbiting scroll 52 revolves. Further, the lubricating oil L in the intermediate groove 535 enters the outer groove 536, travels along the inner wall surface of the convex portion 532, reaches the key groove 534 a and the accommodating concave portion 534, and smoothly slides the rotation prevention member 57.

  As described above, the scroll compressor 1 according to the present embodiment includes the intermediate groove 535 formed in an annular shape along the annular shape of the surface of the thrust portion 533, and the annular outer side of the intermediate groove 535 on the surface of the thrust portion 533. The one end 536a hits the intermediate groove 535, and the other end 536b is provided with an outer groove 536 extending on the key groove 534a.

  According to the scroll compressor 1, the lubricating oil L is stored in the thrust portion 533 by the intermediate groove 535, and then the lubricating oil L is supplied to the key groove 534 a by the outer groove 536. The lubricating oil L can be supplied. For this reason, for example, even when the amount of the lubricating oil L guided to the oil receiving portion 530 inside the convex portion 532 is reduced during low speed operation, the intermediate groove 535 and the outer groove 536 form the bottom of the housing concave portion 534. The lubricating oil L is sufficiently spread over the keyway 534a. As a result, wear of the key 57a of the rotation prevention member 57 due to sliding resistance with respect to the key groove 534a can be prevented, and deterioration in compression performance due to misalignment of the orbiting scroll 52 can be prevented. The low speed operation is an operation at a low rotation speed that does not require a large refrigeration capacity. That is, the operation is performed at a speed lower than the rated speed (for example, 60 rpm).

  Further, in the scroll compressor 1 of the present embodiment, one end 537a hits the intermediate groove 535 on the annular inner side of the intermediate groove 535 on the surface of the thrust portion 533, and the other end 537b extends to the inner peripheral edge of the thrust portion 533. In addition, one end 537a is provided with an inner groove 537 disposed so as to be shifted in the circumferential direction of the intermediate groove 535 with respect to one end 536a of the outer groove 536.

  According to the scroll compressor 1, the intermediate groove 535 is supplemented with the lubricating oil L supplied to the key groove 534a by the outer groove 536 in order to assist the supply of the lubricating oil L to the intermediate groove 535 by the inner groove 537. It becomes possible. In addition, the inner groove 537 is arranged such that one end 537a is shifted in the circumferential direction of the intermediate groove 535 with respect to the one end 536a of the outer groove 536, and does not communicate directly with the outer groove 536, but only through the intermediate groove 535. Since it is configured to communicate with each other, the lubricating oil L is supplied to the outer groove 536 via the intermediate groove 535, so that it is possible to prevent excessive supply of the lubricating oil L to the key groove 534a. .

  The inner grooves 537 are preferably arranged at equal intervals in the circumferential direction of the intermediate groove 535. Thereby, the lubricating oil L can be evenly supplied to the intermediate groove 535. Furthermore, it is preferable that the inner grooves 537 are arranged at equal intervals in the circumferential direction of the intermediate groove 535 and are arranged in a symmetrical inner place with respect to the outer groove 536. As a result, the lubricating oil L can be evenly supplied to the intermediate groove 535 and the lubricating oil L can be supplied evenly to the outer groove 536.

  FIG. 4 is a plan view of a frame showing another example of the inner groove. As shown in FIG. 4, the inner groove 537 may be formed to be inclined with respect to the radial direction of the intermediate groove 535 with one end 537 a facing the turning direction S of the turning scroll 52. With this configuration, the flow rate of the lubricating oil L is increased and flows into the intermediate groove 535 as the orbiting scroll 52 turns, so that the supply amount of the lubricating oil L can be increased, particularly during low-speed operation. effective.

  FIG. 5 is a plan view of a frame showing another example of the inner groove. As shown in FIG. 5, the inner groove 537 may be formed to be inclined with respect to the radial direction of the intermediate groove 535 with one end 537 a facing in the direction opposite to the turning direction S of the orbiting scroll 52. With this configuration, it is possible to reduce the flow rate of the lubricating oil L as the orbiting scroll 52 turns, and to prevent the lubricating oil L from excessively flowing into the intermediate groove 535, particularly at high speed operation. Sometimes effective.

  FIG. 6 is a plan view of a frame showing another example of the outer groove. As shown in FIG. 6, the outer groove 536 is preferably formed with the other end 536 b facing the position where the key 57 b of the rotation prevention member 57 contacts the key groove 534 a by the turning of the turning scroll 52. According to this configuration, it is possible to more effectively prevent the wear of the key 57b by actively supplying the lubricating oil L to the portion where the key 57b of the rotation preventing member 57 contacts the key groove 534a. .

  Further, the passage area of the outer groove 536 is preferably formed larger than the passage area of the inner groove 537. According to this configuration, the outer groove 536 side that is the outer side of the orbiting scroll 52 has a lower pressure than the inner groove 537 side that is the inner side of the orbiting scroll 52 and the lubricating oil L expands. The effect of supplying an appropriate amount of the lubricating oil L to the rotation prevention member 57 is remarkably obtained.

  In addition, since the outer grooves 536 are provided corresponding to the key grooves 534a, it is preferable that at least the same number as the key grooves 534a is provided, and a plurality of outer grooves 536 are provided for one key groove 534a. Also good. When a plurality of the key grooves 534a are provided, the supply amount of the lubricating oil L to the rotation prevention member 57 can be further increased.

  In addition, although two inner grooves 537 are provided in FIGS. 2 and 4 to 6, it is sufficient that at least one inner groove 537 is provided. As the number of the inner grooves 537 increases, the supply amount of the lubricating oil L to the intermediate groove 535 and the outer groove 536 can be increased, which is particularly effective during low-speed operation. On the other hand, the smaller the number of inner grooves 537, the smaller the supply amount of the lubricating oil L to the intermediate grooves 535 and the outer grooves 536, which is particularly effective during high-speed operation.

As the fluid (refrigerant gas) is compressed by the scroll compressor 1 described above, it is preferable to use CO ₂ in consideration of the influence on the environment.

  As described above, the scroll compressor according to the present invention is suitable for supplying an appropriate amount of lubricating oil to the rotation prevention member.

DESCRIPTION OF SYMBOLS 1 Scroll compressor 2 Housing | casing 3 Drive part 33 Rotating shaft 331 Oil supply hole 333 Crank pin 5 Scroll compression mechanism part 50 Compression chamber 51 Fixed scroll 511 Fixed side end plate 512 Fixed side wrap 513 Discharge hole 52 Turning scroll 521 Movable side end plate 521a Key groove 522 Movable side wrap 523 Guide bush 53 Frame 530 Oil receiving portion 531 Bearing hole 532 Protruding portion 533 Thrust portion 534 Housing recessed portion 534a Key groove 535 Intermediate groove 536 Outer groove 536a One end 536b Other end 537 Inner groove 537a One end 537 54 Discharge lead valve 55 Oil separation chamber 56 Seal cover 57 Rotation prevention member 57a, 57b Key 6 Oil supply pump L Lubricating oil S Turning direction

Claims (3)

A fixed scroll provided with a spiral fixed side wrap on the inner surface of the fixed end plate;
A orbiting scroll provided with a spiral movable side wrap meshed with the fixed side wrap of the fixed scroll on the inner surface of the movable side end plate;
A rotation preventing member for revolving orbiting the orbiting scroll while preventing rotation of the orbiting scroll;
A thrust portion that has an annular projecting end surface on the outer periphery of the oil receiving portion to which lubricating oil is supplied faces the outer surface of the movable side end plate of the orbiting scroll and slidably supports the orbiting scroll. And a frame having a keyway for inserting the key of the rotation prevention member on the outer periphery of the thrust portion;
In the scroll compressor with
An intermediate groove formed in an annular shape along the annular shape of the surface of the thrust portion;
An outer groove whose one end hits the intermediate groove on the outer surface of the intermediate groove on the surface of the thrust portion and the other end extends on the key groove;
It is provided on the surface of the thrust portion, and one end always hits the intermediate groove on the inner side of the annular shape of the intermediate groove, and the other end extends to the inner peripheral edge of the thrust portion, and one end is one end of the outer groove. An inner groove that is displaced in the circumferential direction of the intermediate groove,
With
It said groove, characterized and to Luz crawling compressor that is formed inclined with respect to the radial direction of the intermediate grooves toward the one end in a direction opposite to the turning direction of the orbiting scroll. 2. The scroll compressor according to claim 1 , wherein the outer groove is formed with the other end directed to a position where a key of the rotation prevention member contacts the key groove by turning of the orbiting scroll. 3. The scroll compressor according to claim 1, wherein a passage area of the outer groove is formed larger than a passage area of the inner groove.

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