WO2014051102A1

WO2014051102A1 - Scroll compressor

Info

Publication number: WO2014051102A1
Application number: PCT/JP2013/076395
Authority: WO
Inventors: 顕治永原; 和彦松川
Original assignee: ダイキン工業株式会社
Priority date: 2012-09-28
Filing date: 2013-09-27
Publication date: 2014-04-03
Also published as: JP2014070598A; JP5459376B1

Abstract

Provided is a scroll compressor which exhibits excellent reliability, in which a key groove having an Oldham key sliding therein is formed in a fixed scroll, and with which lubrication at a sliding surfaces between the key and the key groove can be reliably performed. The scroll compressor (10) is provided with: a fixed scroll (31) provided with a fixed-side end plate (311), a fixed-side wrap (312), and a peripheral part (313); a movable scroll provided with a movable-side end plate, and a movable-side wrap; and an Oldham coupling provided with a ring part and a second key part. A compression chamber is formed between the fixed-side wrap and the movable-side wrap. In the peripheral part which faces a front surface of the movable-side end plate: a first oil groove (313d) is formed with which oil is supplied and supported, to a constant sliding surface (R1) constantly in contact with the front surface of the movable-side end plate, from an oil-storage space that communicates with a high-pressure oil chamber; a second-key-part sliding space (S2) in which the second key part slides is formed further towards an outer peripheral side than the first oil groove; and a second oil groove (313e) which communicates with the second-key-part sliding space is formed further towards an outer peripheral side than the first oil groove and further towards an inner peripheral side than the second-key-part sliding space.

Description

Scroll compressor

The present invention relates to a scroll compressor in which an Oldham key groove on which an Oldham key slides is formed on a fixed scroll.

Conventionally, there has been known a scroll compressor in which a key groove on which an Oldham key slides is formed in a fixed scroll (for example, Patent Document 1 (Japanese Patent Application Laid-Open No. 2007-16790)).

In a structure in which a key groove is formed in a fixed scroll as in Patent Document 1, a key groove is formed in a housing disposed below the movable scroll (for example, Patent Document 2 (Japanese Patent Laid-Open No. 2008-240709)). ) Is less likely to retain lubricating oil in the space in which the key slides. Therefore, when a keyway is formed in the fixed scroll, abnormalities such as burn-in and wear are likely to occur in the key and the keyway of the fixed scroll. However, the present inventor has found that even when a keyway is formed in the fixed scroll, the key is not actively refueled.
An object of the present invention is to provide a highly reliable scroll compressor in which the key and the keyway are reliably lubricated when the keyway on which the Oldham key slides is formed in the fixed scroll. .

The scroll compressor according to the first aspect of the present invention includes a fixed scroll, a movable scroll, and Oldham. The fixed scroll includes a flat plate-shaped first end plate, a spiral first wrap projecting from the front surface of the first end plate, and a thrust sliding portion surrounding the first wrap. The movable scroll has a flat plate-like second end plate and a spiral second wrap projecting from the front surface of the second end plate. Oldham has an annular ring portion and a key portion protruding from the front surface of the ring portion, and prevents the movable scroll from rotating. The first wrap and the second wrap are combined so that the front surface of the first end plate and the front surface of the second end plate face each other, and a compression chamber is formed between the adjacent first and second wraps. The thrust sliding portion facing the front surface of the second end plate is supplied with oil from a high-pressure space communicating with the high-pressure compression chamber on the always-sliding surface that is always in contact with the front surface of the second end plate. An oil groove is formed. In addition, a key groove space in which the key portion slides is formed on the outer peripheral side of the first oil groove in the thrust sliding portion facing the front surface of the second end plate. Further, a second oil groove communicating with the key groove space is formed on the outer peripheral side of the first oil groove and on the inner peripheral side of the key groove space.

Here, in the thrust sliding portion of the fixed scroll in which the key groove space in which the key portion of Oldham slides is formed, the outer peripheral side of the first oil groove to which oil is supplied from the high pressure space, A second oil groove communicating with the key groove space is formed on the circumferential side. Part of the oil supplied to the first oil groove is collected in the second oil groove, flows along the second oil groove, and is supplied to the key groove space. That is, oil is positively supplied to the key groove space by the second oil groove. As a result, burn-in of the key part in the keyway space is easily prevented and the reliability of the scroll compressor can be improved.

The scroll compressor which concerns on the 2nd viewpoint of this invention is a scroll compressor which concerns on a 1st viewpoint, Comprising: At least one part of the 2nd oil groove is always formed in a sliding surface.
Here, a part of the oil supplied to the first oil groove provided on the constantly sliding surface is easily collected by the second oil groove provided on the always sliding surface. Therefore, oil is reliably supplied to the keyway space. As a result, the reliability of the scroll compressor can be improved.

The scroll compressor which concerns on the 3rd viewpoint of this invention is a scroll compressor which concerns on a 2nd viewpoint, Comprising: The 2nd oil groove at least one part is a thrust sliding which contact | connects the front surface of a 2nd end plate intermittently. It is formed on the intermittent sliding surface of the part.
Here, since the second oil groove is intermittently communicated with the space arranged on the outer peripheral side of the movable scroll, the second oil groove exists not only on the oil supplied to the first oil groove but also on the outer peripheral side of the movable scroll. Oil is also collected in the second oil groove. Therefore, it is easy to secure the amount of oil used for lubrication in the keyway space. As a result, oil is reliably supplied to the keyway space, and the reliability of the scroll compressor can be improved.

The scroll compressor which concerns on the 4th viewpoint of this invention is a scroll compressor which concerns on a 3rd viewpoint, Comprising: The back side and outer peripheral side of the 2nd end plate of a movable scroll are connected with the compression chamber of a peripheral side at least for a fixed period. A back pressure space is formed. The second oil groove is always in communication with the back pressure space.
Here, since the second oil groove is always in communication with the back pressure space formed on the back side and the outer peripheral side of the second end plate of the movable scroll, oil for lubricating the key groove space is always secured from the back pressure space. it can. As a result, it is easy to reliably supply oil to the keyway space.

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 a plurality of second oil grooves are formed in the thrust sliding portion.
Here, the oil is easily collected in the second oil groove, and the oil is easily supplied to the key groove space reliably. Therefore, the reliability of the scroll compressor can be improved.

In the scroll compressor according to the present invention, in the thrust sliding portion of the fixed scroll in which the key groove space in which the key portion of Oldham slides is formed, the outer peripheral side of the first oil groove to which oil is supplied from the high pressure space, and A second oil groove communicating with the key groove space is formed on the inner peripheral side of the key groove space. Part of the oil supplied to the first oil groove is collected in the second oil groove, flows along the second oil groove, and is actively supplied to the key groove space. As a result, burn-in of the key part in the keyway space is easily prevented and the reliability of the scroll compressor can be improved.

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. The second oil groove always extends on the sliding surface and communicates with the second fixed scroll key groove. 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 figure for demonstrating the high pressure oil flow path for supplying a high pressure oil to the 1st oil groove from the eccentric part space about the scroll compressor of FIG. It is a schematic perspective view of the Oldham coupling of the scroll compressor of FIG. In the scroll compressor of FIG. 1, it is a figure explaining the operation | movement which the communicating groove formed in the peripheral part of a fixed scroll, and the communicating hole formed in the movable side end plate of a movable scroll communicate. It is the top view which looked at the fixed scroll of the scroll compressor concerning modification A from the lower part. The second oil groove is formed on the intermittent sliding surface and the constantly sliding surface, and communicates with the second fixed scroll key groove. It is the top view which looked at the fixed scroll of the scroll compressor concerning modification A from the lower part. The second oil groove is formed on the non-sliding surface, the intermittent sliding surface, and the constantly sliding surface, and communicates with the second fixed scroll key groove. It is the top view which looked at the fixed scroll of the scroll compressor concerning modification B from the lower part. A plurality (two) of second oil grooves communicating with the second fixed scroll keyway are formed.

Embodiment
An embodiment of a scroll compressor of the present invention will be described with reference to the drawings.

(1) Overall Configuration The scroll compressor 10 according to the present embodiment is used for an outdoor unit of a refrigeration apparatus.
As shown in FIG. 1, the scroll compressor 10 mainly includes a casing 20, a scroll compression mechanism 30, an Oldham joint 40, a drive motor 50, a crankshaft 60, and a lower bearing portion 70.
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. The casing 20 includes a substantially cylindrical cylindrical member 21 that is open at the top and bottom, and an upper lid 22a and a lower lid 22b that are provided at the upper end and the lower end of the cylindrical member 21, respectively. The cylindrical member 21, and the upper lid 22a and the lower lid 22b are fixed by welding so as to keep airtightness.

The casing 20 accommodates the components of the scroll compressor 10 including the scroll compression mechanism 30, Oldham coupling 40, drive motor 50, crankshaft 60, and lower bearing portion 70. An oil sump space 26 is formed in the lower part of the casing 20. In the oil reservoir space 26, oil L for lubricating the scroll compression mechanism 30 and the like is stored. The oil sump space 26 communicates with a first space S1 described later.
In the upper part of the casing 20, a suction pipe 23 that sucks in a gas refrigerant that is a compression target of the scroll compression mechanism 30 is provided through the upper lid 22 a. The lower end of the suction pipe 23 is connected to a fixed scroll 31 of a scroll compression mechanism 30 described later. The suction pipe 23 communicates with a compression chamber 35 of a scroll compression mechanism 30 described later. A low-pressure gas refrigerant before compression flows through the suction pipe 23.

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. More specifically, the discharge pipe 24 is arranged so that the end of the discharge pipe 24 inside the casing 20 protrudes into a first space S <b> 1 formed below the housing 33 of the scroll compression mechanism 30. A high-pressure gas refrigerant compressed by the scroll compression mechanism 30 flows through the discharge pipe 24.

(2-2) Scroll Compression Mechanism As shown in FIG. 1, the scroll compression mechanism 30 is mainly compressed in combination with a housing 33, a fixed scroll 31 disposed above the housing 33, and the fixed scroll 31. And a movable scroll 32 that forms a chamber 35. An eccentric space 37 and a back pressure space 36 are 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 disk-like fixed side end plate 311 and a spiral shape protruding from the front surface (lower surface 311a) 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 through the fixed side end plate 311 in the thickness direction substantially at the center of the fixed end end plate 311. The gas refrigerant compressed in the compression chamber 35 is discharged upward from the discharge port 311b, passes through a refrigerant path 315 formed in the fixed scroll 31 and a refrigerant passage 33d formed in the housing 33 described later, and enters the first space S1. Flow into.
The fixed side wrap 312 is formed in a spiral shape and protrudes from the lower 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 described later are combined so that the lower surface 311a of the fixed-side end plate 311 and the upper surface 321a of the movable-side end plate 321 face each other. A compression chamber 35 is formed between the movable side wrap 322. 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 eccentric portion space 37. The end surface of the fixed side wrap 312 on the movable scroll 32 side and the upper 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 lower 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 edge 313 has a lower surface 313a facing the front surface (upper surface 321a) of the movable side end plate 321 of the movable scroll 32 described later. The movable scroll 32 is pressed against the fixed scroll 31 by a force generated in a back pressure space 36 and an eccentric space 37 which will be described later. As a result, the contact portion between the lower surface 313 a of the peripheral edge 313 and the upper surface 321 a of the movable side end plate 321 is in close contact.
When the movable scroll 32 revolves with respect to the fixed scroll 31 as will be described later, the lower surface 313a of the peripheral edge portion 313 intermittently contacts the constantly sliding surface R1 that always contacts the upper surface 321a of the movable side end plate 321. It has intermittent sliding surface R2 and non-sliding surface R3 which does not contact. As shown by a one-dot broken line in FIG. 2, in a plan view, the sliding surface R1, the intermittent sliding surface R2, and the non-sliding surface R3 are always arranged in this order from the center side to the outer peripheral side of the fixed scroll 31. The intermittent sliding surface R2 faces a back pressure space 36 described later when not in contact with the upper surface 321a of the movable side end plate 321. The non-sliding surface R3 always faces the back pressure space 36.

A first fixed scroll key groove 313b, a second fixed scroll key groove 313c, a first oil groove 313d, a second oil groove 313e, and a communication groove 314 are formed on the lower surface 313a of the peripheral edge 313. Each groove will be described in detail below.

(2-2-1-1) Fixed Scroll Key Groove The first and second fixed scroll

key grooves

313b and 313c are grooves whose longitudinal direction is the radial direction of the fixed scroll 31, as shown in FIG. The first and second fixed

scroll keyways

313b and 313c are formed over the intermittent sliding surface R2 and the non-sliding surface R3 from the vicinity of the boundary between the sliding surface R1 and the intermittent sliding surface R2 to the outer edge of the peripheral edge 313. Is done. The first and second fixed

scroll keyways

313b and 313c are arranged point-symmetrically with respect to the center of the fixed side end plate 311 of the fixed scroll 31 in a plan view as shown in FIG. The first and second fixed

scroll keyways

313b and 313c are formed so as not to penetrate the peripheral edge 313 in the vertical direction.

In the first and second fixed scroll

key grooves

313b and 313c, a second key portion 43 of the Oldham joint 40 described later is fitted, and in other words, in the longitudinal direction of the first and second fixed scroll

key grooves

313b and 313c. It slides in the radial direction of the fixed scroll 31. That is, the second key portion sliding space S2 in which the second key portion 43 slides is formed in the first and second fixed scroll

key grooves

313b and 313c, respectively. The second key portion sliding space S2 is a space that always communicates with a back pressure space 36 described later.
The first fixed scroll keyway 313b is disposed substantially adjacent to a first oil groove 313d described later. On the other hand, the second fixed scroll keyway 313c is disposed away from the first oil groove 313d as shown in FIG. Further, as shown in FIG. 2, a second oil groove 313e, which will be described later, communicates with the second fixed scroll key groove 313c. That is, the second oil groove 313e communicates with the second key portion sliding space S2 formed in the peripheral edge portion 313.

Note that the distance (width) in the short direction of the first and second fixed scroll

key grooves

313 b and 313 c is formed substantially equal to the circumferential width of the second key portion 43. More specifically, the distance in the short direction of the first and second fixed scroll

key grooves

313b and 313c is determined so that the second key portion 43 smoothly slides in the first and second fixed scroll

key grooves

313b and 313c. As far as possible, the gap when the second key portion 43 is fitted into the first and second fixed scroll

key grooves

313b and 313c is formed to be as small as possible. On the other hand, the distance between the upper surface of the second key portion 43 and the upper surfaces of the first and second fixed scroll

key grooves

313b and 313c is short of the second key portion 43 and the first and second fixed scroll

key grooves

313b and 313c. It is set to be longer than the gap with the hand direction.

(2-2-1-2) First Oil Groove As shown in FIG. 2, the first oil groove 313d is along the boundary between the constantly sliding surface R1 and the intermittent sliding surface R2 in the constantly sliding surface R1. Thus, it is formed in a substantially arc shape. However, the first oil groove 313d is spaced apart from the second fixed scroll key groove 313c, and approaches the inner edge side of the peripheral edge 313 in the vicinity of the second fixed scroll key groove 313c, that is, approaches the fixed side wrap 312. Formed. The cross section of the first oil groove 313d is substantially rectangular, but is not limited to this, and may be substantially triangular or arcuate.

As shown in FIG. 2, the first oil groove 313 d is formed counterclockwise from the vicinity of the communication groove 314 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.
High-pressure oil L is supplied to the first oil groove 313d in order to lubricate the contact portion between the peripheral edge 313 and the movable side end plate 321. The oil L is supplied to the first oil groove 313d through a high-pressure oil passage 321g formed in the movable side end plate 321 of the movable scroll 32 described later.

(2-2-1-3) Second Oil Groove As shown in FIG. 2, the second oil groove 313e is formed on the constantly sliding surface R1 side near the boundary between the constantly sliding surface R1 and the intermittent sliding surface R2. This is a substantially arc-shaped groove extending from the second fixed scroll key groove 313 c to the vicinity of the communication groove 314 in the clockwise direction when viewed from the lower surface 313 a side of the peripheral edge 313. The cross section of the second oil groove 313e is substantially rectangular, but is not limited to this, and may be substantially triangular or arcuate.

(2-2-1-4) Communication groove The communication groove 314 has a communication hole 321c formed in the movable side end plate 321 of the movable scroll 32 when the movable scroll 32 revolves with respect to the fixed scroll 31 as described later. It is formed on the sliding surface R1 at all times so as to intermittently communicate with a back pressure space 36 to be described later. Specifically, as shown in FIG. 2, the communication groove 314 is formed on the inner side by about one turn from the end of winding of the fixed side wrap 312. The communication groove 314 communicates with the intermediate pressure compression chamber 35 located on the peripheral side. The intermediate pressure indicates a pressure intermediate between the suction pressure and the discharge pressure.
As shown in FIG. 2, the communication groove 314 extends from the inner edge of the peripheral edge 313 to the outer side in the circumferential direction of the fixed scroll 31, and extends from the outer edge of the peripheral edge 313 of the extended portion 314 a to the fixed side. And a curved portion 314b formed to be curved inward with respect to the center of the end plate 311. As will be described later, when the movable scroll 32 revolves with respect to the fixed scroll 31, the communication groove 314 includes an intermediate pressure compression chamber 35 and a back pressure space 36 that are positioned on the peripheral side, and are connected to the communication groove 314. And it communicates intermittently through the communication hole 321c. That is, the compression chamber 35 located on the peripheral side and the back pressure space 36 communicate with each other for at least a certain period with respect to one revolution cycle of the movable scroll 32.

(2-2-2) Movable Scroll As shown in FIGS. 1 and 3, the movable scroll 32 includes a substantially disc-shaped movable side end plate 321 and a spiral projecting from the front surface (upper surface 321a) of the movable side end plate 321. And a boss portion 323 that protrudes from the back surface (lower surface 321b) of the movable side end plate 321 and is formed in a cylindrical shape.
Two projections 321i are provided on the periphery of the movable side end plate 321 so as to project outward in the radial direction of the movable side end plate 321 in a plan view. The first and first projections 321i open downward. Two

movable scroll keyways

321e and 321f are formed.
As shown in FIG. 3, the first and second

movable scroll keyways

321e and 321f are respectively formed on convex portions 321i arranged to face the center of the movable side end plate 321. The first and second movable scroll

key grooves

321e and 321f are substantially rectangular grooves whose longitudinal direction is the radial direction of the movable scroll 32. The first and second movable scroll

key grooves

321e and 321f are formed on the lower surface 321b of the movable side end plate 321 up to the vicinity of the center in the vertical direction (thickness direction) of the movable side end plate 321. The first and second movable scroll

key grooves

321e and 321f are arranged in a direction rotated 90 degrees with respect to the first and second fixed scroll

key grooves

313b and 313c formed in the fixed side end plate 311. A first key portion 42 of the Oldham coupling 40 to be described later is fitted into the first and second movable scroll

key grooves

321e and 321f, and is movable in the longitudinal direction of the first and second movable scroll

key grooves

321e and 321f. It slides in the radial direction of the scroll 32. The distance (width) in the short direction of the first and second movable scroll

key grooves

321e and 321f is formed to be substantially equal to the width in the circumferential direction of the first key portion 42. More specifically, the distance in the short direction between the first and second movable scroll

key grooves

321e and 321f is determined so that the first key portion 42 smoothly slides within the first and second movable scroll

key grooves

321e and 321f. To the extent possible, the gap when the first key portion 42 is fitted into the first and second movable scroll

key grooves

321e and 321f is formed to be as small as possible. The distance between the upper surface of the first key portion 42 and the upper surfaces of the first and second movable scroll

key grooves

321e and 321f is short of the first key portion 42 and the first and second fixed scroll

key grooves

313b and 313c. It is set longer than the distance of the gap with the direction.

Further, the movable side end plate 321 of the movable scroll 32 has a communication hole 321c that intermittently connects a communication groove 314 formed in the peripheral edge 313 of the fixed scroll 31 and a back pressure space 36 described later. It is formed so as to penetrate 321 in the thickness direction. When the movable scroll 32 revolves with respect to the fixed scroll 31, the communication hole 321c is disposed so as to communicate with the communication groove 314 for a predetermined period in one revolution cycle. The communication between the communication hole 321c and the communication groove 314 will be described later.
Further, as shown in FIG. 4, a first oil groove 313 d formed in the peripheral edge 313 of the fixed scroll 31 and an oil supply path 63 of the crankshaft 60 described later are provided inside the movable side end plate 321 of the movable scroll 32. A high-pressure oil flow path 321g for communication is formed. One end of the high-pressure oil passage 321g opens above the inside of the cylindrical boss 323, and is formed so as to extend in the movable end plate 321 in the substantially radial direction. In other words, one end of the high-pressure oil flow path 321g is the lower surface 321b of the movable side end plate 321 and opens to a portion facing the upper end of the crankshaft 60, and extends in the movable side end plate 321 in a substantially radial direction. Formed as follows. The other end of the high pressure oil passage 321g is at a position where the high pressure oil passage 321g and the first oil groove 313d communicate at least intermittently when the movable scroll 32 revolves with respect to the fixed scroll 31, as will be described later. An opening is formed on the upper surface 321a of the movable side end plate 321. The high-pressure oil flow path 321g communicates with the first oil groove 313d, whereby the high-pressure oil L flowing through the oil supply path 63 is supplied to the first oil groove 313d.

The boss portion 323 is a cylindrical portion whose upper end is blocked. The boss portion 323 and the eccentric portion 61 are connected to each other by inserting an eccentric portion 61 of the crankshaft 60 described later into the boss portion 323. The boss portion 323 is disposed in an eccentric portion space 37 formed between the movable scroll 32 and a housing 33 described later.
As will be described later, high-pressure oil L is supplied to the eccentric portion space 37 from the oil sump space 26 communicating with the high-pressure first space S1, and as a result, the eccentric portion space 37 becomes high pressure. More specifically, the pressure in the eccentric portion space 37 is substantially equal to the discharge pressure of the scroll compressor 10 at the steady state. Due to the pressure acting on the eccentric portion space 37, a force is generated on the lower surface 321 b of the movable side end plate 321 in the eccentric portion space 37 to push the movable scroll 32 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 eccentric portion space 37 and the force generated by the pressure in the back pressure space 36 described later.

The movable scroll 32 is engaged with the fixed scroll 31 via an Oldham joint 40 described later. The Oldham joint 40 is a member that prevents the orbiting scroll 32 from rotating and revolves. When the crankshaft 60 connected by the boss portion 323 and the eccentric portion 61 rotates, the first key portion 42 of the Oldham joint 40 is in the first and second movable scroll

key grooves

321e and 321f, and the second key portion 43 is in the first position. The first and second fixed

scroll keyways

313b and 313c slide, the movable scroll 32 revolves without rotating with respect to the fixed scroll 31, and the gas refrigerant in the compression chamber 35 is compressed. More specifically, the compression chamber 35 is reduced in volume as it moves in the center direction of the fixed-side end plate 311 and the movable-side end plate 321 due to the revolution of the movable scroll 32, and the pressure in the compression chamber 35 is increased at the same time. To do. That is, the pressure in the central compression chamber 35 is higher than that in the peripheral compression chamber 35.

(2-2-3) Back Pressure Space The back pressure space 36 is above the housing 33 described later, and is located on the back side (lower surface 321b) side and outer peripheral side (periphery surface 321d side) of the movable side end plate 321 of the movable scroll 32. It is a space that is formed. The back pressure space 36 faces the lower surface 321b and the peripheral surface 321d of the movable side end plate 321. The back pressure space 36 is arranged on the peripheral side with respect to the eccentric space 37 formed near the center of the movable side end plate 321. In order to separate the back pressure space 36 and the eccentric part space 37 in an airtight state, a seal ring 38 is disposed between the housing 33 and the lower surface 321b of the movable side end plate 321.
As described above, the back pressure space 36 is intermittently communicated with the compression chamber 35 located on the peripheral side of the intermediate pressure. Due to the pressure in the back pressure space 36, a force is generated in the movable scroll 32 to push the lower surface 321 b 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 eccentric space 37 and the force generated by the pressure in the back pressure space 36.

Note that the back pressure space 36 communicates with the second key portion sliding space S2 in which the second key portion 43 of the Oldham joint 40 slides. Further, the back pressure space 36 communicates with an upper space S <b> 3 formed above the fixed scroll 31.

(2-2-4) Housing The housing 33 is press-fitted into the cylindrical member 21, and is fixed over the entire circumferential direction on the outer peripheral surface thereof. The housing 33 and the fixed scroll 31 are arranged such that the upper end surface of the housing 33 faces the lower surface 313a of the peripheral edge 313 of the fixed scroll 31, and is fixed by a bolt or the like (not shown).
The housing 33 includes a second recess 33b disposed so as to be recessed in the center of the upper surface, a bearing portion 33c disposed below the second recess 33b, and a first recess disposed so as to surround the second recess 33b. 33a is formed.

The second recess 33 b surrounds the side surface of the eccentric part space 37 in which the boss part 323 of the movable scroll 32 is disposed.
A main shaft 62 of the crankshaft 60 is inserted into the bearing portion 33c, and the main shaft 62 is rotatably supported.
The first recess 33 a is a part of the lower surface and the side surface surrounding the back pressure space 36.

(2-3) Oldham Joint The Oldham Joint 40 is a member for preventing the rotational movement of the movable scroll 32. As shown in FIG. 5, the Oldham Joint 40 is mainly composed of the ring portion 41, the first key portion 42, and the first key portion 42. 2 keys 43 are provided.
As shown in FIG. 5, the ring portion 41 is a substantially annular member, and has projecting portions 411 that project radially outward at four locations. An upper surface 41a (front surface) and a lower surface 41b (back surface) of the ring portion 41 are substantially flat surfaces parallel to each other. The upper surface 41a of the ring portion 41 is a lower surface 321b of the movable side end plate 321 and the lower surface 41b of the ring portion 41 is a housing. It faces the bottom surface of the first recess 33a of 33 respectively.

The first key portion 42 is a pair of convex portions that extend upward from the protruding portion 411 of the ring portion 41 to the first and second movable scroll

key grooves

321e and 321f of the movable scroll 32. That is, the first key portion 42 is a convex portion that extends upward from the upper surface 41 a (front surface) of the ring portion 41. The pair of first key portions 42 are arranged in a point manner with respect to the center of the ring portion 41. The first key portion 42 is fitted in the first and second movable scroll

key grooves

321e and 321f of the movable scroll 32, and slides in the first and second movable scroll

key grooves

321e and 321f.
The second key portion 43 is a pair of convex portions that extend upward from the protruding portion 411 of the ring portion 41 to the first and second fixed scroll

key grooves

313 b and 313 c of the fixed scroll 31. That is, the second key portion 43 is a convex portion that extends upward from the upper surface 41 a (front surface) of the ring portion 41. The pair of second key parts 43 are arranged as point targets with respect to the center of the ring part 41. Further, in plan view, the second key portion 43 is disposed at a position rotated 90 degrees with respect to the center of the ring portion 41 with the first key portion 42. The second key portion 43 is fitted in the first and second fixed scroll

key grooves

313b and 313c of the fixed scroll 31, and slides in the first and second fixed scroll

key grooves

313b and 313c.

(2-4) Drive Motor The drive motor 50 is rotatably accommodated with an annular stator 51 fixed to the inner wall surface of the cylindrical member 21 and a slight gap (air gap passage) inside the stator 51. And a rotor 52.
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. As the rotor 52 rotates, the movable scroll 32 revolves with respect to the fixed scroll 31.

(2-5) 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 scroll 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 portion 33c of the housing 33 and a lower bearing portion 70 described later. The main shaft 62 is coupled to the rotor 52 of the drive motor 50 between the bearing portion 33 c and the lower bearing portion 70.
As shown in FIG. 1, an oil supply path 63 for supplying oil L for lubrication to the scroll compression mechanism 30 and the like is formed inside the crankshaft 60. The oil supply path 63 has a main path 64 that extends vertically along the axis of the crankshaft, and first to

third sub paths

65a, 65b, 65c extending from the main path 64 in the radial direction of the crankshaft 60. .

The main path 64 extends from the lower end to the upper end of the crankshaft 60 and opens at the upper and lower ends of the crankshaft 60. An oil supply pump 66 is provided on the lower end side of the main path 64. Due to the transfer force of the oil supply pump 66 and the differential pressure between the oil reservoir space 26 and the eccentric space 37, the high-pressure oil L in the oil reservoir space 26 is conveyed to the opening at the upper end of the crankshaft 60. When the movable scroll 32 revolves and the high pressure oil flow path 321g and the first oil groove 313d communicate with each other, the oil L carried to the opening at the upper end of the crankshaft 60 passes through the high pressure oil flow path 321g and the first oil groove. 313d.
The first sub-path 65 a extends in the radial direction from the main path 64 toward the outer periphery of the eccentric part 61 and opens on the outer peripheral surface of the eccentric part 61. The second sub-path 65 b extends in the main shaft 62 in the radial direction of the main shaft 62 from the main path 64 toward the inner peripheral surface of the bearing portion 33 c and opens to the outer peripheral surface of the main shaft 62. The third sub-path 65 c extends in the main shaft 62 in the radial direction from the main path 64 toward the inner peripheral surface of the lower bearing portion 70 described later, and opens to the outer peripheral surface of the main shaft 62. A part of the oil L flowing through the main path 64 flows into the first to

third sub paths

65a, 65b, 65c, and flows out from the opening formed on the outer peripheral surface of the eccentric portion 61 or the main shaft 62.

(2-6) Lower Bearing Part The lower bearing part 70 is disposed below the drive motor 50. The lower bearing portion 70 is fixed to the cylindrical member 21. The lower bearing portion 70 is inserted with the main shaft 62 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 with reference to FIG.

(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 joint 40. 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 compression chamber 35 during compression on the peripheral side is an intermediate value (intermediate pressure) between the suction pressure and the discharge pressure. The high-pressure gas refrigerant compressed by the scroll 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 the refrigerant passage 315 formed in the fixed scroll 31 and the refrigerant passage 33d formed in 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 eccentric portion space 37 and the back pressure space 36 during operation of the scroll compressor 10 will be described.
First, the pressure in the eccentric space 37 will be described. Since the oil L is supplied from the oil sump space 26 to the eccentric part space 37, the pressure of the eccentric part space 37 becomes substantially equal to the pressure of the oil sump space 26. Since the oil sump space 26 communicates with the first space S1, the pressure is substantially the same as that of the first space S1. That is, the oil reservoir space 26 normally stores high-pressure (substantially discharge pressure) oil L. Therefore, the eccentric portion space 37 to which the oil L 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 hole 321c of the movable side end plate 321 moves along the locus C indicated by a two-dot broken line in FIG. 6 in a plan view with respect to the communication groove 314 of the peripheral edge 313 of the fixed scroll 31. . As a result, the intermediate pressure compression chamber is located on the peripheral side where the communication hole 321c of the movable side end plate 321 communicates with the communication groove 314 of the peripheral portion 313 of the fixed scroll 31 for a certain period during the revolution cycle of the movable scroll 32. 35 and the back pressure space 36 communicate with each other. As a result, the pressure in the back pressure space 36 becomes an intermediate pressure. As described above, the compression chamber 35 and the back pressure space 36 are intermittently communicated via the communication hole 321c and the communication groove 314, thereby controlling the pressure in the back pressure space 36 to a desired pressure. It becomes easy.

(3-2) Oil Supply Operation When the crankshaft 60 rotates, the oil L in the oil sump space 26 is sucked up by the main path 64 of the oil supply path 63 and flows upward to the opening at the upper end of the crankshaft 60. Further, a part of the oil L flowing through the main path 64 flows through the first to

third sub paths

65a, 65b, 65c branched from the main path 64. The oil L flows out from the openings of the first to third sub-paths 65a, 65b, 65c formed on the upper end of the main path 64 and the outer peripheral surface of the crankshaft 60. When the movable scroll 32 revolves and the high pressure oil passage 321g and the first oil groove 313d communicate with each other, the oil L that has flowed out to the upper end of the main path 64 enters the first oil groove 313d via the high pressure oil passage 321g. Supplied. The oil L flowing out from the upper end of the main path 64 and the openings of the first and

second sub paths

65a, 65b mainly flows through the scroll compression mechanism 30 including the bearing portion 33c and flows out of the opening of the third sub path 65c. Mainly lubricates the lower bearing portion 70.

The eccentric portion space 37 of the housing flows out of the upper end opening of the main path 64, the opening of the first sub path 65a, and the opening of the second sub path 65b, and is used for lubricating the eccentric section 61 and the bearing section 33c. Oil L flows in. A part of the oil L in the eccentric part space 37 leaks into the back pressure space 36 from the gap of the seal ring 38 provided between the lower surface 321 b of the movable side end plate 321 and the housing 33. Part of the oil L flowing into the back pressure space 36 moves between the upper surface 321 a of the movable side end plate 321 and the lower surface 313 a of the peripheral edge 313, and the pressure difference is applied to the compression chamber 35 having a lower pressure than the back pressure space 36. Flows in.
The oil L supplied to the first oil groove 313d spreads in the vicinity of the first oil groove 313d on the lower surface 313a of the peripheral edge 313 and the upper surface 321a of the movable side end plate 321 when the movable scroll 32 revolves. In addition, since the high-pressure (discharge pressure) oil L is supplied to the first oil groove 313d in a steady state, the oil L is low pressure or intermediate located on the inner peripheral side of the first oil groove 313d due to the differential pressure. The lower surface 313 a of the peripheral edge 313 and the upper surface 321 a of the movable side end plate 321 are moved toward the pressure compression chamber 35 in the substantially radial direction of the fixed scroll 31. Further, the oil L is substantially reduced in the fixed scroll 31 toward the intermediate pressure back pressure space 36 located on the outer peripheral side of the movable scroll 32 due to the differential pressure, in other words, toward the outer peripheral side of the first oil groove 313d. The lower surface 313a of the peripheral edge 313 and the upper surface 321a of the movable side end plate 321 are moved in the radial direction.

When the oil L moves on the lower surface 313a of the peripheral edge 313 and the upper surface 321a of the movable side end plate 321, a part of the oil L is collected in the second oil groove 313e. Then, the collected oil L flows in the second oil groove 313e toward the second fixed scroll key groove 313c communicating therewith. That is, a part of the oil L supplied to the first oil groove 313d is supplied to the second key portion sliding space S2 on the second fixed scroll key groove 313c side, and the second key portion 43 of the Oldham joint 40 is lubricated. Is done.
Since the first fixed scroll keyway 313b is disposed so as to be substantially adjacent to the first oil groove 313d, a groove communicating with the second key portion sliding space S2 on the first fixed scroll keyway 313b side is provided. Even if it is not formed, good sliding is performed. However, when the first fixed scroll key groove 313b and the first oil groove 313d are arranged at a distance, it is desirable to form the second oil groove 313e communicating with the first fixed scroll key groove 313b.

(4) Features (4-1)
The scroll compressor 10 of this embodiment includes a fixed scroll 31, a movable scroll 32, and an Oldham joint 40. The fixed scroll 31 includes a flat fixed side end plate 311, a spiral fixed side wrap 312 protruding from the lower surface 311 a (front surface) of the fixed side end plate 311, and a peripheral edge 313 surrounding the fixed side wrap 312. The peripheral edge portion 313 is an example of a thrust sliding portion. The movable scroll 32 has a flat movable side end plate 321 and a spiral movable side wrap 322 protruding from the upper surface 321a (front side) of the movable side end plate 321. The Oldham coupling 40 includes an annular ring portion 41 and a second key portion 43 protruding from the upper surface 41a (front surface) of the ring portion 41, and prevents the movable scroll 32 from rotating. The fixed side wrap 312 and the movable side wrap 322 are combined so that the lower surface 311a of the fixed side end plate 311 and the upper surface 321a of the movable side end plate 321 face each other, and between the adjacent fixed side wrap 312 and the movable side wrap 322. The compression chamber 35 is formed. An oil sump that communicates with the high-pressure compression chamber 35 via the first space S1 on a peripheral sliding surface R1 that is always in contact with the upper surface 321a of the movable side end plate 321 is disposed on the peripheral edge 313 facing the upper surface 321a of the movable end end plate 321. Oil L is supplied from the space 26, and a first oil groove 313d in which the oil L is held is formed. In addition, a second key portion sliding space S2 in which the second key portion 43 of the Oldham joint 40 slides on the outer peripheral side of the first oil groove 313d is formed on the peripheral edge portion 313 facing the upper surface 321a of the movable side end plate 321. It is formed. Further, a second oil groove 313e communicating with the second key portion sliding space S2 is formed on the outer peripheral side of the first oil groove 313d and on the inner peripheral side of the second key portion sliding space S2.

As described above, in the scroll compressor 10 of the present embodiment, the second key portion sliding space S2 that faces the upper surface 321a of the movable side end plate 321 and slides the second key portion 43 of the Oldham joint 40 is formed. In the peripheral edge 313 of the fixed scroll 31, the second outer side of the first oil groove 313d to which the oil L is supplied from the high pressure oil sump space 26 and the inner peripheral side of the second key part sliding space S2 A second oil groove 313e communicating with the key part sliding space S2 is formed. A part of the oil L supplied to the first oil groove 313d is collected in the second oil groove 313e, flows along the second oil groove 313e, and is supplied to the second key portion sliding space S2. . That is, the oil L is positively supplied to the second key portion sliding space S2 by the second oil groove 313e. As a result, seizure of the second key portion 43 in the second key portion sliding space S2 can be reliably prevented and the reliability of the scroll compressor 10 can be improved.

(4-2)
In the scroll compressor 10 of the present embodiment, the second oil groove 313e is always formed on the sliding surface R1.
For this reason, a part of the oil L supplied to the first oil groove 313d provided on the sliding surface R1 is easily collected by the second oil groove 313e. Therefore, the oil L is reliably supplied to the second key portion sliding space S2. As a result, the reliability of the scroll compressor 10 can be improved.

(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 said embodiment, although the 2nd oil groove 313e is always formed in the sliding face R1, it is not limited to this.

For example, as shown in FIG. 7, a part of the second oil groove 313e may be formed on the intermittent sliding surface R2 of the peripheral edge portion 313 that intermittently contacts the upper surface 321a of the movable side end plate 321.
Further, for example, as shown in FIG. 8, the second oil groove 313e is disposed on the lower surface 321b side and the outer peripheral side of the movable side end plate 321 of the movable scroll 32, and at least a fixed period with the compression chamber 35 on the peripheral side (intermediate pressure). You may always communicate with the back pressure space 36 which communicates. That is, the second oil groove 313e may be formed over the non-sliding surface R3, the intermittent sliding surface R2, and the constantly sliding surface R1.
In this case, not only the oil L supplied to the first oil groove 313d but also the oil L present in the back pressure space 36 can be collected by the second oil groove 313e. As a result, it becomes easy to secure the amount of oil L used for lubricating the second key portion sliding space S2, and it is easy to prevent seizure of the second key portion 43 in the second key portion sliding space S2.

In addition, when the scroll compressor 10 is activated, the pressure in the eccentric space 37, that is, the pressure of the oil L supplied to the first oil groove 313 d temporarily becomes lower than the pressure in the back pressure space 36. there is a possibility. In this case, the oil L supplied to the first oil groove 313d is unlikely to be supplied to the higher pressure back pressure space 36 side, that is, the second oil groove 313e side due to the differential pressure. Therefore, the amount of oil L collected in the second oil groove 313e may be reduced. However, when a part of the second oil groove 313e is formed to extend to the intermittent sliding surface R2 or the non-sliding surface R3, the second oil groove 313e is intermittently or always back pressure space. Since it communicates with 36, it is easy to reliably supply the oil L to the second key portion sliding space S2.

(5-2) Modification B
In the said embodiment, although the 2nd oil groove 313e is one, it is not limited to this. A plurality of second oil grooves 313 e may be formed on the peripheral edge 313 of the fixed scroll 31.

For example, as shown in FIG. 9, a plurality of second oil grooves 313e communicating with the second fixed scroll key groove 313c may be provided.
As a result, the oil L can be reliably collected by the second oil groove 313e, and the oil L can be easily supplied to the key groove space. As a result, it becomes easy to prevent the second key portion 43 from being burned in the second key portion sliding space S2.
If necessary, one or a plurality of second oil grooves 313e communicating with the first fixed scroll key groove 313b may be provided.
As a result, the oil L is easily supplied to the second key portion sliding space S2 in the first fixed scroll keyway 313b, and seizure of the Oldham key portion is easily prevented.

(5-3) Modification C
In the embodiment described above, the back pressure space 36 disposed on the lower surface 321b side of the movable side end plate 321 of the movable scroll 32 communicates with the intermediate pressure compression chamber 35 for a certain period of time, but is not limited thereto.

The space on the lower surface 321b side and the outer peripheral side of the movable side end plate 321 of the movable scroll 32 may not be communicated with the compression chamber 35 (the communication groove 314 and the communication hole 321c are not formed), and may be a low pressure space. That is, there may be a so-called high-low pressure scroll compressor.

The present invention can be applied to a scroll compressor in which an Oldham key groove on which an Oldham key slides is formed on a fixed scroll.

10 Scroll compressor 26 Oil sump space (high pressure space)
31 Fixed scroll 311 Fixed side end plate (first end plate)
311a The lower surface of the fixed side panel (front surface of the first panel)
312 Fixed wrap (first wrap)
313 Peripheral part (thrust sliding part)
313d First oil groove 313e Second oil groove 32 Movable scroll 321 Movable side end plate (second end plate)
321a Upper surface of movable side end plate (front side of second end plate)
322 Movable wrap (second wrap)
35 Compression chamber 36 Back pressure space 40 Oldham joint (Oldham)
41 Ring part 43 Second key part (key part)
L Oil R1 Always sliding surface R2 Intermittent sliding surface S2 Second key part sliding space (key groove space)

JP 2007-16790 A JP 2008-240709 A

Claims

A flat first end plate (311), a spiral first wrap (312) protruding from the front surface (311a) of the first end plate, and a thrust sliding portion (313) surrounding the first wrap. Having a fixed scroll (31);
A movable scroll (32) having a flat plate-like second end plate (321) and a spiral second wrap (322) protruding from the front surface (321a) of the second end plate;
An Oldham (40) having an annular ring portion (41) and a key portion (43) protruding from the front surface of the ring portion, and preventing rotation of the movable scroll;
With
The first wrap and the second wrap are combined so that the front surface of the first end plate and the front surface of the second end plate are opposed to each other, and between the adjacent first wrap and the second wrap. Forming a compression chamber (35),
In the thrust sliding portion facing the front surface of the second end plate,
A first oil groove in which oil (L) is supplied from a high-pressure space (26) communicating with the high-pressure compression chamber and held in the constantly sliding surface (R1) that is always in contact with the front surface of the second end plate. (313d) is formed,
A key groove space (S2) in which the key portion slides is formed on the outer peripheral side from the first oil groove,
A second oil groove (313e) communicating with the key groove space is formed on the outer peripheral side of the first oil groove and on the inner peripheral side of the key groove space.
Scroll compressor (10).
At least a part of the second oil groove is formed on the constantly sliding surface.
The scroll compressor according to claim 1.
At least a part of the second oil groove is formed on the intermittent sliding surface (R2) of the thrust sliding portion that is in intermittent contact with the front surface of the second end plate.
The scroll compressor according to claim 2.
Back pressure space (36) communicating with the compression chamber on the peripheral side for at least a fixed period is formed on the back side and the outer peripheral side of the second end plate of the movable scroll,
The second oil groove is always in communication with the back pressure space;
The scroll compressor according to claim 3.
A plurality of the second oil grooves are formed in the thrust sliding portion.
The scroll compressor according to any one of claims 1 to 4.