JP2012062855A - Scroll-type compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely and stably lubricate a bush and a crank pin constituting a scroll-type compressor, and to surely lubricate a sliding part between a movable scroll and a fixed scroll.SOLUTION: In a fixed scroll 18 constituting a scroll-type compressor 10, a supply path 26 is formed along a fixed side convoluted wall 24, and the oil storage room of a rear housing 14 and the leading end 24a of the fixed side convoluted wall 24 are communicated with each other. In a movable scroll 20, a communication path 54 is formed so that a movable side substrate part 38 communicates with the circular recessed part 48 of a boss part 46. When the movable scroll 20 turns and the supply path 26 and the communication path 54 become linear, lubrication oil is supplied through the supply path 26 and the communication path 54 to the circular recessed part 48 to be used for lubrication.

Description

  The present invention relates to a scroll type compressor, and more particularly to a scroll type compressor that compresses fluid inside a compressor by turning a movable scroll with respect to a fixed scroll.

  Conventionally, a fixed scroll having a fixed plate and a spiral fixed wall upright on the fixed plate, and a movable scroll arranged so that the movable plate and the spiral movable wall upright on the movable plate are engaged with the fixed wall. There is known a scroll type compressor including the above in the housing. In this scroll type compressor, an eccentric crank pin is inserted into a bush supported rotatably with respect to a housing, and the movable scroll is turned through the bush. Accordingly, the refrigerant is compressed by moving the fixed wall of the fixed scroll and the compression chamber formed between the movable wall of the movable scroll and the fixed plate and the movable plate gradually from the outer peripheral part to the central part (for example, patent Reference 1).

JP 2007-9781 A

  In the scroll compressor as described above, it is desired to sufficiently supply lubricating oil between the crank pin and the hole of the bush into which the crank pin is inserted, and to suppress generation of noise and vibration due to insufficient lubrication. There are challenges.

  The present invention has been made in consideration of the above-mentioned problems, and reliably and stably lubricates the bush and the crankpin, and also reliably lubricates the sliding portion between the movable scroll and the fixed scroll. It is an object of the present invention to provide a scroll type compressor that can be used.

In order to achieve the above object, the present invention provides a housing, a fixed scroll provided in the housing and having a fixed-side spiral wall, a movable scroll meshed with the fixed scroll, and under the driving action of a drive source. A crank pin that is eccentric with respect to the axis of the rotating shaft, and a bush that has a pin hole through which the crank pin is inserted and that swings and displaces the movable scroll. In the scroll type compressor to compress,
The fixed scroll is formed with a first passage that is provided in the housing and communicates with an oil storage chamber in which lubricating oil is stored, and that opens to face the movable scroll, while the movable scroll has the fixed passage. A second passage that opens to face the scroll and communicates with the holding portion that holds the bush is formed, and when the movable scroll rotates, the movable scroll rotates once through the rotary shaft. The first passage communicates with at least the opening of the second passage.

  According to the present invention, the fixed scroll is formed with the first passage through which the lubricating oil can flow, and the first passage is communicated with the oil storage chamber of the housing and is opened to the movable scroll side. On the other hand, the movable scroll is opened so as to face the fixed scroll, and a second passage communicating with the holding portion held by the bush is formed. The opening of the second passage is configured to communicate with the first passage.

  Therefore, when the orbiting scroll rotates, the opening of the second passage communicates with the first passage, so that the lubricating oil from the oil storage chamber is supplied to the holding portion through the first passage and the second passage. It becomes. As a result, the lubricating oil can be supplied to the bush and the crankpin inserted through the bush for lubrication. On the other hand, when the first passage and the second passage are not in communication, the lubricating oil supplied through the first passage is not supplied to the second passage in the non-communication state, and the end of the fixed scroll Therefore, the sliding portion between the fixed scroll and the movable scroll can be lubricated.

  Further, a sealing member may be provided on the substrate portion of the movable scroll, and when the first passage communicates with the second passage, the sealing member may be brought into contact so as to cover the opening of the first passage.

  Furthermore, the opening of the second passage may be formed larger than the opening of the first passage.

  Furthermore, the opening portion of the first passage and the opening portion of the second passage are each formed in a circular shape in cross section, and when the movable scroll rotates, the locus drawn by the center of the opening portion in the second passage is the first passage. The sum of the radius of the opening of the first passage and the radius of the opening of the second passage may be shorter than the diameter of the trajectory through the center of the opening of the one passage.

  According to the present invention, the following effects can be obtained.

  That is, the fixed scroll communicates with the oil storage chamber of the housing, opens to the movable scroll side to form a first passage through which lubricating oil can flow, and opens to the movable scroll so as to face the fixed scroll, and Forming a second passage that communicates with the holding portion that holds the bush, and communicating the opening of the second passage with the first passage while the movable scroll rotates and makes one rotation. Accordingly, it is possible to selectively perform lubrication of the bush and the crankpin and lubrication of sliding portions of the movable scroll and the fixed scroll by utilizing the turning operation of the movable scroll.

1 is a partially omitted vertical sectional view of a scroll compressor according to an embodiment of the present invention. It is an expanded sectional view which shows the oil storage chamber and fixed scroll vicinity in the scroll compressor of FIG. FIG. 3 is an enlarged cross-sectional view showing a state in which the movable scroll turns and the supply passage and the communication passage communicate with each other in the scroll compressor of FIG. 2. It is the front view which looked at the fixed scroll shown in FIG. 1 from the fixed side spiral wall side.

  A preferred embodiment of a scroll compressor according to the present invention will be described in detail below with reference to the accompanying drawings.

  In FIG. 1, reference numeral 10 indicates a scroll compressor according to an embodiment of the present invention.

  As shown in FIG. 1, the scroll compressor 10 includes a front housing 12 formed in a lid shape and a rear housing (housing) 14 formed in a cup shape.

  In the upper part of the rear housing 14, for example, an inlet (not shown) for introducing a gas made of a refrigerant gas or the like is formed, and the compressed gas compressed in the inside is discharged to the refrigerant circulation system. A discharge port (not shown) is formed.

  The rear housing 14 is provided with a plurality of attachment portions 16 for attaching the scroll compressor 10 to, for example, an engine or an external device. At this time, the scroll compressor 10 is disposed and fixed horizontally, for example, so that the axes of the front housing 12 and the rear housing 14 are substantially parallel to the ground.

  Then, a fixed scroll 18 and a movable scroll 20 that turns with respect to the fixed scroll 18 are inserted into the rear housing 14 from the opened one end side (in the direction of arrow A).

  The fixed scroll 18 includes a fixed side substrate portion 22 including an outer peripheral edge portion connected to the rear housing 14, and a fixed scroll erected from the fixed side substrate portion 22 toward the movable scroll 20 (in the direction of arrow A). And a side spiral wall 24.

  The fixed-side spiral wall 24 is formed in a spiral shape so as to gradually spread radially outward from the center of the fixed-side substrate portion 22, and when the fixed scroll 18 is attached to the rear housing 14, the fixed-side spiral is the lower side. A supply passage (first passage) 26 through which the lubricating oil G flows is formed in the wall 24. Further, the distal end portion 24a of the fixed-side spiral wall 24 is formed so as to be slidable on a movable-side substrate portion 38 of the movable scroll 20 described later.

  The supply passage 26 is formed in, for example, a circular cross section, extends along the axial direction of the fixed scroll 18, and extends from the distal end portion 24 a of the fixed spiral wall 24 to the root portion 24 b side that is the fixed substrate portion 22 side. It penetrates in a straight line. The supply passage 26 has an opening 26 a that opens at the distal end 24 a of the stationary spiral wall 24, and communicates with an oil storage chamber 32 that will be described later through the stationary substrate 22.

  On the other hand, a gas discharge chamber 30 communicating with a discharge port (not shown) is formed between the back surface of the fixed scroll 18 and the rear housing 14, and is separated from the gas discharge chamber 30 and lubricated. An oil storage chamber 32 in which G is stored is formed. Lubricating oil G separated from the refrigerant is stored in the oil storage chamber 32 by a separation mechanism (not shown), and is supplied to the distal end portion 24 a side (arrow A direction) of the fixed scroll 18 by communicating with the supply passage 26.

  In addition, a compressed gas lead-out hole 34 communicating from a gas compression chamber 42 to be described later to the gas discharge chamber 30 is formed at a substantially central portion of the fixed side substrate portion 22, and the fixed side substrate portion 22 includes a plurality of The rear housing 14 is connected to each other by a fastening bolt 36.

  Further, the compressed gas outlet hole 34 is closed on the back surface of the fixed-side substrate portion 22, and when the compressed gas compressed in the gas compression chamber 42 reaches a predetermined pressure, it opens to the gas discharge chamber 30. A discharge valve (not shown) for leading the compressed gas is provided.

  As shown in FIG. 1, the movable scroll 20 has a movable side substrate portion 38, and a movable side that is erected in a spiral shape from the movable side substrate portion 38 to the fixed scroll 18 side and meshes with the fixed side spiral wall 24. And a spiral wall 40.

  In the rear housing 14, the movable scroll wall 40 is disposed on the fixed scroll 18 side, and the movable scroll 20 is configured with the fixed board portion 22 and the fixed spiral wall 24 constituting the fixed scroll 18. A gas compression chamber 42 is formed by the movable side substrate portion 38 and the movable side spiral wall 40. In order to seal the gas compression chamber 42, a seal member 44 is slidably in contact with the movable side substrate portion 38 and the fixed side substrate portion 22 at each end of the fixed side spiral wall 24 and the movable side spiral wall 40, respectively. Is installed.

  Further, a cylindrical boss portion 46 is formed in the center of the movable side substrate portion 38 so as to protrude in a direction away from the movable side spiral wall 40, and a circular recess 48 formed therein has a swivel bearing. The bush 52 is inserted through the pin 50 so as to be rotatable.

  A part of the communication passage (second passage) 54 is formed in the boss portion 46 at a position that is substantially the center of the circular recess 48 when the movable scroll 20 is mounted on the rear housing 14.

  The communication passage 54 is formed in a circular shape in cross section, and one end thereof is formed on the movable side substrate portion 38 and opens toward the fixed scroll 18 (in the direction of arrow B) to form an opening 54a, and the other end is circular. An opening is formed inside the recess 48. Further, the opening area of the communication passage 54 is formed larger than the opening area of the supply passage 26.

  Specifically, as shown in FIG. 4, the opening 54 a of the communication passage 54 has a path L formed by the center of the opening 54 a when the movable scroll 20 is turned. Is set so as to pass through the center of the opening 26a.

  In other words, the sum of the radius of the opening 54a in the communication passage 54 and the radius of the opening 26a in the supply passage 26 is set to be smaller than the diameter of the locus L formed in a circular shape.

  Then, when the positions of the communication passage 54 and the supply passage 26 coincide with each other, the lubricating oil G is supplied from the supply passage 26 to the communication passage 54.

  Further, the communication path 54 extends from one end portion along the axial direction (arrow A direction), and then is bent at a right angle toward the radial inward direction of the movable scroll 20 and extends obliquely toward the circular recess 48. And is open at a substantially central portion.

  Further, a seal ring (seal member) 56 is attached to an end surface of the movable side substrate portion 38 where the communication path 54 is opened via an annular groove formed so as to surround the communication path 54. The seal ring 56 is formed, for example, from the same synthetic resin such as polyphenylene sulfide resin as the seal member 44 having a certain thickness, and is mounted so as not to protrude from the end face. As shown in FIG. 3, when the communication passage 54 and the supply passage 26 are arranged in a straight line by turning the movable scroll 20, the distal end portion 24 a of the fixed-side spiral wall 24 abuts on the seal ring 56. The sealing property between the communication passage 54 and the supply passage 26 is ensured.

  The drive unit 58 includes a rotary shaft 60, a bush 52 connected to an end of the rotary shaft 60, first and second bearings 62 and 64 that rotatably support the rotary shaft 60, and the bush 52. And a swivel bearing 50 that is rotatably supported. The rotary shaft 60 is inserted into an opening provided at an end portion of the front housing 12 with a shaft portion 66 as one end thereof, and is rotatably supported via a second bearing 64. A sealing member 70 for sealing the gas suction chamber 68 between the front housing 12 and the front housing 12 is fitted on the outer peripheral side of the shaft portion 66.

  On the other hand, the other end of the rotary shaft 60 is provided with a support body 72 having an enlarged diameter relative to the shaft portion 66, and the support body 72 is rotated by being inserted into a first bearing 62 provided in the through hole. It is supported freely. The first bearing 62 is held inside the front housing 12. The support body 72 is provided with a crank pin 74 that is eccentric with respect to the axis thereof.

  The bush 52 is pivoted so as to be swingable by the rotating shaft 60 by inserting the crank pin 74 into a hole formed eccentrically with respect to the axial center thereof, so that the movable scroll 20 changes the turning radius. Turn. The bush 52 is configured to be rotatable around the crank pin 74 in a state in which the crank pin 74 is prevented from coming off in the axial direction by the locking ring 76. A balance weight 78 is mounted near the base of the crank pin 74 via the bush 52.

  A thrust plate 80 is provided between the movable side substrate portion 38 of the movable scroll 20 and a support surface formed inside the front housing 12 so as to slidably support the movable scroll 20 with a sliding contact surface.

  On the other hand, a pulley 84 is attached to the outer periphery of the opening of the front housing 12 via a third bearing 82. A rotational force is transmitted to the pulley 84 via a belt or the like from a rotational drive source such as an engine (not shown), and the rotational force is transmitted to or disconnected from the rotational shaft 60 by an on / off operation of the electromagnetic clutch 86.

  The scroll compressor 10 according to the embodiment of the present invention is basically configured as described above. Next, the operation, action, and effect thereof will be described.

  First, when a rotational force is transmitted to the rotary shaft 60 under the action of the electromagnetic clutch 86, the support 72 rotates through the first bearing 62, and thereby the crank pin 74 fixed to the support 72. Swivels in an eccentric state with respect to the axis of the rotary shaft 60. As a result, the bushing 52 rotates and the movable scroll 20 slidably supported by the thrust plate 80 turns with respect to the fixed scroll 18.

  As a result, the gas supplied from the suction port is introduced into the rear housing 14 and is formed between the fixed spiral wall 24 in the fixed scroll 18 and the movable spiral wall 40 in the movable scroll 20. 42.

  At this time, the lubricating oil G previously stored in the oil storage chamber 32 flows to the movable scroll 20 side (in the direction of arrow A) through the supply passage 26 of the fixed scroll 18, and the supply passage is under the turning action of the movable scroll 20. 26 and the communication path 54 are in a straight line, and the opening portion 26a of the supply passage 26 and the opening portion 54a of the communication path 54 communicate with each other by the contact between the tip 24a of the fixed spiral wall 24 and the seal ring 56. To do. As a result, the lubricating oil G is supplied from the supply passage 26 to the circular recess 48 via the communication passage 54. As a result, the bush 52 provided in the circular recess 48 is lubricated by the lubricating oil G, and the lubricating oil G circulated along the end surface of the bush 52 is supplied to the hole of the bush 52. Thus, the crank pin 74 inserted through the hole is lubricated.

  On the other hand, as shown in FIGS. 1 and 2, the movable scroll 20 is pivoted so that the supply passage 26 is not in line with the communication passage 54, and the opening 54 a of the communication passage 54 is the opening of the supply passage 26. In the case of being on the locus L passing through the center of 26a, the tip end portion 24a of the fixed spiral wall 24 and the seal ring 56 do not come into contact with each other, so that the supply passage 26 and the communication passage 54 are not in communication. The lubricating oil G is not supplied to the communication path 54.

  In this case, the lubricating oil G is discharged from the end portion of the supply passage 26 and is supplied between the distal end portion 24 a of the fixed-side spiral wall 24 and the movable-side substrate portion 38 of the movable scroll 20. Lubrication between the wall 24 and the movable side substrate portion 38 is performed.

  That is, the lubricating oil G is supplied to the bush 52 through the circular recess 48 when the supply passage 26 faces the communication passage 54 by the turning operation of the movable scroll 20 (see FIG. 3). Is not supplied to the communication path 54 (see FIG. 2), it is supplied between the fixed-side spiral wall 24 of the fixed scroll 18 and the movable scroll 20.

  Then, the gas compression chamber 42 formed between the fixed-side spiral wall 24 in the fixed scroll 18 and the movable-side spiral wall 40 in the movable scroll 20 advances gradually from the outer peripheral portion to the central portion, and the sealing member 44 is sealed. The gas introduced into the gas suction chamber 68 under the stopping action is gradually compressed. Thereafter, the compressed gas compressed is led out from the compressed gas outlet hole 34 to the gas discharge chamber 30, and the compressed gas is not shown in the figure through the discharge port after the lubricating oil G is separated by a separation mechanism (not shown). It is discharged into the refrigerant circulation system.

  The lubricating oil G separated from the compressed gas moves to the oil storage chamber 32 and is stored therein, and flows again to the movable scroll 20 side through the supply passage 26 of the fixed scroll 18 to be lubricated.

  As described above, in the present embodiment, the fixed-side spiral wall 24 constituting the fixed scroll 18 communicates with the oil storage chamber 32 provided on the rear housing 14 side, and the front end portion 24a side facing the movable scroll 20 ( A supply passage 26 extending in the direction of arrow A) is provided, and a communication passage 54 communicating with the circular recess 48 in which the bush 52 is held is formed in the movable side substrate 38 of the movable scroll 20 facing the supply passage 26. ing. Further, a seal ring 56 is provided on the end surface of the movable side substrate 38 so as to surround the opening 54 a of the communication path 54.

  As a result, when the movable scroll 20 is swiveled and the communication passage 54 is aligned with the supply passage 26 (see FIG. 3), the distal end portion 24a of the fixed spiral wall 24 having the supply passage 26 and the seal are sealed. When the ring 56 abuts, the communication passage 54 and the supply passage 26 communicate with each other in a sealed state. As a result, the lubricating oil G is supplied from the oil storage chamber 32 to the circular recess 48 through the supply passage 26 and the communication passage 54, and the bush 52 and the crank pin 74 inserted through the bush 52 can be lubricated.

  On the other hand, as shown in FIG. 2, when the communication passage 54 is not aligned with the supply passage 26 and is offset, the lubricating oil G does not flow from the supply passage 26 to the communication passage 54 side. It is in a non-communication state and is supplied to a sliding portion between the fixed-side spiral wall 24 and the adjacent movable-side substrate 38. As a result, the lubricating oil G is suitably supplied to the sliding portion between the fixed scroll 18 and the movable scroll 20 for lubrication.

  That is, the lubricating oil G stored in the oil storage chamber 32 is selectively supplied to the bush 52 and the crank pin 74 and the sliding portion of the movable scroll 20 and the fixed scroll 18 using the turning operation of the movable scroll 20. And can be lubricated.

  The scroll compressor according to the present invention is not limited to the above-described embodiment, and can of course have various configurations without departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 10 ... Scroll type compressor 12 ... Front housing 14 ... Rear housing 18 ... Fixed scroll 20 ... Movable scroll 22 ... Fixed side board | substrate part 24 ... Fixed side spiral wall 26 ... Supply passage 30 ... Gas discharge chamber 32 ... Oil storage chamber 38 ... Movable Side substrate part 40 ... movable side spiral wall 46 ... boss part 48 ... circular recess 50 ... slewing bearing 52 ... bush 54 ... communication path 56 ... seal ring 58 ... drive part 60 ... rotating shaft 72 ... support body 74 ... crankpin 76 ... Lock ring 84 ... pulley

Claims (4)

A housing, a fixed scroll provided in the housing and having a fixed spiral wall, a movable scroll meshed with the fixed scroll, and an axis of a rotating shaft that rotates under the driving action of a driving source. In a scroll type compressor comprising a crank pin and a bush having a pin hole through which the crank pin is inserted and swinging and displacing the movable scroll, and compressing fluid by turning the movable scroll.
The fixed scroll is formed with a first passage that is provided in the housing and communicates with an oil storage chamber in which lubricating oil is stored, and that opens to face the movable scroll, while the movable scroll has the fixed passage. A second passage that opens to face the scroll and communicates with the holding portion that holds the bush is formed, and when the movable scroll rotates, the movable scroll rotates once through the rotary shaft. The scroll compressor characterized in that the first passage communicates with at least the opening of the second passage. The scroll compressor according to claim 1, wherein
A seal member is provided on the substrate portion of the movable scroll, and the seal member abuts so as to cover the opening of the first passage when the first passage and the second passage communicate with each other. Scroll type compressor. In the scroll compressor according to claim 1 or 2,
The scroll compressor is characterized in that the opening of the second passage is formed larger than the opening of the first passage. In the scroll compressor according to any one of claims 1 to 3,
The opening portion of the first passage and the opening portion of the second passage are each formed in a circular shape in cross section, and when the movable scroll rotates, the locus drawn by the center of the opening portion of the second passage is the first passage. A scroll characterized in that it passes through the center of the opening of one passage and the sum of the radius of the opening of the first passage and the radius of the opening of the second passage is shorter than the diameter of the locus. Mold compressor.

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