JP2011174453A - Scroll compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To sufficiently lubricate a given lubrication portion by using oil supplied to a variable volume chamber together with refrigerant gas in a simple and compact structure. <P>SOLUTION: An oil return passage 41 is formed which communicates inside of a variable volume chamber 28 defined between a fixed scroll member and a turning scroll member 22, with a back surface side of the turning scroll member 22. The oil return passage 41 is disposed at a position nearer to an inverter installed in an upper part of a housing. Also, the oil return passage 41 is formed such that an end thereof leads to a step part 22d inside the variable volume chamber 28, and the other end thereof leads to a slide portion S1 disposed at the top position in a rotation restriction member 37 of the turning scroll member 22. An oil supply groove 42 is formed on a back surface of an end plate 22a of the turning scroll member 22 such that a slide portion S1 at which the oil return passage 41 is disposed is connected to slide portions S2-S4 at which the oil return passage 41 is not disposed. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a scroll compressor, and more particularly to a scroll compressor suitable for use in an in-vehicle air conditioner or the like.

  In a general scroll compressor used in an air conditioner or the like, a fixed scroll member and a orbiting scroll member are accommodated in a metal housing, and the orbiting scroll member with respect to the fixed scroll member is driven by the power of an engine or an electric motor. By making a revolving revolution, the refrigerant gas is sucked into the variable volume chamber defined between the scroll members, and the refrigerant gas is compressed by gradually reducing the volume of the variable volume chamber. The gas is discharged and circulated into a closed loop flow path such as an air conditioner.

  The refrigerant gas contains oil in advance, and the oil becomes a mist, and is lubricated between the fixed scroll member and the orbiting scroll member that are precisely combined and slide relative to each other. The oil used for this lubrication is discharged into the discharge chamber together with the compressed refrigerant gas, and is separated from the refrigerant gas by the oil separation cylinder in this discharge chamber and collected in the lower part. Conventionally, the oil stored here has been recirculated to the suction chamber side by the lubricating oil recirculation structure described in Patent Document 1, for example.

  In the lubricating oil recirculation structure of Patent Document 1, the discharge chamber and the groove-shaped communication path engraved around the end plate of the fixed scroll member and the oil passage formed so as to pass through the inside of the fixed scroll member An electric motor that communicates with the suction chamber and uses the pressure difference between the discharge chamber and the suction chamber to recirculate the oil stored in the bottom of the discharge chamber to the suction chamber side, for example, to drive the orbiting scroll member Used for lubrication near the main shaft bearing.

Japanese Patent No. 4256801

  However, in this conventional lubricating oil recirculation structure, the oil once flowing down to the bottom of the discharge chamber is raised to the height of the spindle bearing or the like using the pressure difference, so that the amount of oil to be recirculated is insufficient. There was concern. In particular, it is difficult to lubricate the sliding portion of the rotation regulating mechanism that prevents rotation of the orbiting scroll member as well as lubrication in the vicinity of the spindle bearing.

  In addition, a long oil passage must be formed around the end plate of the fixed scroll member, inside the fixed scroll member, or in the housing, which increases the manufacturing cost of the scroll compressor.

  Further, conventionally, in order to separate the oil discharged into the discharge chamber from the refrigerant gas, a predetermined volume of oil separation cylinder has to be provided in the discharge chamber, which has prevented the scroll compressor from being made compact.

  The present invention has been made in view of such circumstances, and with a simple and compact structure, the oil supplied to the variable volume chamber together with the refrigerant gas is effectively used, and a predetermined lubrication point is sufficiently obtained. An object is to provide a scroll compressor that can be lubricated.

In order to solve the above problems, the present invention employs the following means.
That is, in the scroll compressor according to the first aspect of the present invention, the fixed scroll member and the orbiting scroll member are combined, and the orbiting scroll member is revolved with respect to the fixed scroll member by an electric motor, whereby The refrigerant gas is sucked into the variable volume chamber defined between the scroll members, and the refrigerant gas is compressed and discharged while the oil contained in the refrigerant gas is used to lubricate the scroll members. In the scroll compressor integrally provided with an inverter for controlling the electric motor, an oil return passage for supplying oil supplied into the variable volume chamber to the back side of the orbiting scroll member, It is formed in the end plate of the orbiting scroll member, and the oil return passage is disposed at a portion near the inverter. And wherein the door.

  According to the present invention, part of the oil supplied to the variable volume chamber together with the refrigerant gas is discharged from the oil return passage to the back side of the orbiting scroll member. Then, since the refrigerant gas whose temperature has risen after the inverter has been cooled is well mixed with the discharged oil and reaches the inside of the housing, the refrigerant gas in which the oil content is well mixed causes the rear side of the orbiting scroll member. The main shaft bearing of the motor provided in the motor, the rotation restricting mechanism of the orbiting scroll member, and the like are sufficiently lubricated.

  The scroll compressor according to a second aspect of the present invention is characterized in that, in the first aspect, the inverter is provided in an upper part of a housing of the scroll compressor. According to this configuration, since the oil return passage is also provided on the upper side of the housing together with the inverter, the oil discharged from the oil return passage flows down from above to each lubricating portion provided on the back side of the orbiting scroll member. Therefore, each lubrication part can be lubricated satisfactorily.

  Furthermore, the scroll compressor according to the third aspect of the present invention is characterized in that, in the first or second aspect, the oil return passage is formed so as to communicate with a step portion in the variable volume chamber. And According to this configuration, since the oil is directly sent to the oil return passage from the stepped portion in the variable volume chamber where the oil is likely to accumulate, the oil discharge amount can be increased and the lubrication performance can be improved.

  And the scroll compressor which concerns on the 4th aspect of this invention is a sliding of the rotation control mechanism in which the said oil return channel | path prevents the rotation of the said turning scroll member in the said any one of the 1st-3rd aspect. It is formed so that it may lead to a part. Thereby, the oil discharged from the oil return passage to the back side of the orbiting scroll member is supplied to the sliding portion of the rotation restricting mechanism, and the sliding portion is well lubricated.

  The scroll compressor according to a fifth aspect of the present invention is the scroll compressor according to the fourth aspect, wherein a plurality of sliding portions of the rotation restricting mechanism are provided, and the oil return passage is at least one of the plurality of sliding portions. The end plate of the orbiting scroll member is connected to a sliding portion formed so as to communicate with one and provided with the oil return passage and a sliding portion provided with no oil return passage. An oil supply groove is formed on at least one of the back surface and the thrust surface of the member facing the back surface.

  According to the above configuration, the oil supplied to the sliding portion provided with the oil return passage is also supplied to the sliding portion not provided with the oil return passage through the oil supply groove. For this reason, a plurality of sliding parts can be lubricated satisfactorily. In addition, the number of oil return passages can be minimized.

  Furthermore, in the scroll compressor according to the sixth aspect of the present invention, the fixed scroll member and the orbiting scroll member are combined, a rotation restricting mechanism for the orbiting scroll member is provided, and the orbiting scroll member is used as the fixed scroll member. The reciprocating swivel movement causes the refrigerant gas to be sucked into the variable volume chamber defined between the scroll members and compressed and discharged by the oil contained in the refrigerant gas. In the scroll compressor configured to provide lubrication between the scroll members, an oil return passage for supplying oil supplied into the variable volume chamber to the back side of the orbiting scroll member is provided on the orbiting scroll member. The oil return passage formed in the end plate has a small number of sliding portions provided in the rotation restricting mechanism. Ku and is formed so as to communicate the sliding portion also located at the top above it, characterized in.

  According to the present invention, the oil supplied to the variable volume chamber together with the refrigerant gas is discharged from the oil return passage to the back side of the orbiting scroll member, and the uppermost of the plurality of sliding portions provided here Is supplied to the sliding part. Thereafter, the oil flows down due to gravity, and is supplied to the sliding portion located below and the lubrication in the vicinity of the main shaft bearing of the electric motor, and these lubricating portions are well lubricated.

  As described above, according to the scroll compressor according to the present invention, the oil supplied to the variable volume chamber together with the refrigerant gas is obtained by a simple and compact structure in which the oil return passage is formed in the end plate of the orbiting scroll member. By utilizing this, it is possible to sufficiently lubricate a predetermined lubrication point.

It is a longitudinal section showing a schematic structure of a scroll compressor concerning a 1st embodiment of the present invention. It is a longitudinal cross-sectional view which expands the vicinity of the partition member of the scroll compressor shown in FIG. 1, a turning scroll member, and a rotation control mechanism, and shows 1st Embodiment of this invention. It is a front view of a turning scroll member. It is a perspective view of a turning scroll member. It is a rear view of the turning scroll member which shows 1st Embodiment of this invention by the VV arrow view of FIG. It is a rear view of the turning scroll member which shows 2nd Embodiment of this invention. It is a rear view of the turning scroll member which shows the 1st modification of the present invention. It is a rear view of the turning scroll member which shows the 2nd modification of the present invention.

  Hereinafter, a plurality of embodiments of a scroll compressor according to the present invention will be described with reference to the drawings.

[First Embodiment]
First, a first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a longitudinal sectional view showing a schematic configuration of a scroll compressor according to the present embodiment. The scroll compressor 1 is used in, for example, a vehicle air conditioner, and includes an electric motor that drives the compressor and an inverter that controls the electric motor.

  An aluminum alloy housing 2 that forms the outer shell of the scroll compressor 1 is configured by fastening a compressor side housing 3 and an electric motor side housing 4 with a partition wall member 5 therebetween and fastening them with bolts 6. The partition member 5 is a member that separates the compressor-side housing 3 and the motor-side housing 4, and is provided with a plurality of intake ports 5 a that allow communication between the chambers on both sides. An inverter box 7 is integrally formed on the upper part of the motor side housing 4, and an inverter 8 is installed therein.

  A scroll-type compression mechanism 11 is incorporated in the compressor-side housing 3, and an electric motor 12 is incorporated in the motor-side housing 4, and the compression mechanism 11 and the electric motor 12 are coaxially connected via a main shaft 14. Have been integrated. The vicinity of the front end of the main shaft 14 is pivotally supported by a main bearing 18 that is press-fitted into the partition member 5, and the rear end is pivotally supported by a sub-bearing 19 that is press-fitted to the rear end face of the motor-side housing 4. Further, a stator 15 and a rotor 16 constituting the electric motor 12 are incorporated in the electric motor side housing 4, and the stator 15 is fixed to the inner peripheral surface of the electric motor side housing 4, and the rotor 16 is arranged at an intermediate portion of the main shaft 14. It is provided integrally with rotation.

  On the other hand, the compression mechanism 11 includes a fixed scroll member 21 and an orbiting scroll member 22, and the fixed scroll member 21 has a configuration in which a spiral wall body 21b is integrally erected on one side surface of the end plate 21a. As with the fixed scroll member 21, the orbiting scroll member 22 has a configuration in which a spiral wall body 22b is integrally provided on one side surface of the end plate 22a (see FIGS. 3 and 4). reference). The wall body 21b and the wall body 22b have substantially the same shape. The end plate 21 a of the fixed scroll member 21 is fixed to the inner end surface of the compressor side housing 3 by a plurality of bolts 24 and the like.

  The orbiting scroll member 22 has a back surface of the end plate 22a slidably abutting against a thrust surface 5b (see FIGS. 1 and 2) of the partition member 5, and is sandwiched between the thrust surface 5b and the fixed scroll member 21. Thus, it is held in the compressor side housing 3 while being restricted from moving in the axial direction. Further, the orbiting scroll member 22 is eccentric with respect to the fixed scroll member 21 by the revolving orbit radius with the wall body 22b meshed with the wall body 21b of the fixed scroll member 21, and has a phase of 180 °. It is assembled in a shifted state.

  Further, the orbiting scroll member 22 is capable of revolving orbiting with respect to the fixed scroll member 21 while being prevented from rotating by a rotation restricting mechanism 37 provided between the end plate 22a and the partition wall member 5 which will be described in detail later. It is supported. The front end of the wall body 21b of the fixed scroll member 21 is in contact with the end plate 22a of the orbiting scroll member 22, and the end of the wall body 22b of the orbiting scroll member 22 is in contact with the end plate 21a of the fixed scroll member 21, thereby A pair of airtight variable volume chambers 28 are formed surrounded by the wall 22a and the walls 21b and 22b. Note that a seal fitting groove for fitting the seal member 29 shown in FIG. 2 is formed at the tip of the walls 21b and 22b (indicated by reference numeral 22c in FIG. 3).

  In the compression mechanism 11, as shown in FIGS. 2 to 4, a step portion 22d in which the thickness of the end plate 22a changes in the middle of a spiral passage between the wall bodies 22b that overlap in the radial direction of the orbiting scroll member 22 is provided. Is formed. The thickness of the end plate 22a is thicker toward the inner side of the spiral passage with the step 22d as a boundary. The same applies to the fixed scroll member 21. Thereby, the height dimension of the variable volume chamber 28 becomes small from the middle of the spiral shape.

  As shown in FIG. 2, a journal portion 14 a having a large one-stage diameter that is press-fitted into the main bearing 18 is formed near the tip of the main shaft 14. A crank pin 14b that is eccentric with respect to the axis of the main shaft 14 protrudes from the front surface of the journal portion 14a. The crank pin 14b is connected to the orbiting scroll member via a drive bush 31 and a drive bearing 32. A drive boss 22e integrally formed on the back side of the end plate 22a of 22 is rotatably inserted. The drive bush 31 is provided with a balance weight 33 for canceling vibration caused by the unbalance amount given to the orbiting scroll member 22.

  As shown in FIG. 5, the rotation restricting mechanism 37 for preventing the rotation of the orbiting scroll member 22 includes a rotation prevention ring (Oldham joint) 38 and a pair carved on the back side of the end plate 22 a of the orbiting scroll member 22. And a pair of lateral sliding grooves 5c (indicated by imaginary lines in FIG. 5) engraved on the thrust surface 5b of the partition wall member 5. Note that the rotation prevention ring 38 (38a, 38b, 38c), the longitudinal sliding groove 22f, and the lateral sliding groove 5c in FIG. 2 are indicated by a section developed along the line II-O-II in FIG. .

  The rotation prevention ring 38 includes a ring main body 38a formed in an annular shape such as an elliptical shape or a substantially circular shape, and a pair of vertical sliding protrusions 38b and lateral sliding protrusions 38c that are integrally formed with the ring main body 38a and extend in the radial direction. It is formed. These two longitudinal sliding protrusions 38b and lateral sliding protrusions 38c are arranged on a straight line passing through the center point O of the ring body 38a, and a line connecting the longitudinal sliding protrusions 38b and the lateral sliding protrusions 38c are connected to each other. The connecting lines are arranged at right angles at the center point O. Further, in a side view (see FIG. 2), the longitudinal sliding protrusion 38b is formed with a step so as to protrude one step further toward the orbiting scroll member 22 than the ring body 38a, and the lateral sliding protrusion 38c is formed on the ring body 38a. It is formed extending from the edge without any step.

  On the other hand, a pair of longitudinal sliding grooves 22f engraved on the end plate 22a and a pair of lateral sliding grooves 5c engraved on the thrust surface 5b are also aligned on a straight line as shown in FIG. It arrange | positions so that it may oppose on both sides of the center point O. Then, the longitudinal sliding protrusion 38b and the lateral sliding protrusion 38c of the rotation preventing ring 38 are closely and slidably fitted into the longitudinal sliding groove 22f and the lateral sliding groove 5c, respectively. Four sliding portions S1, S2, S3, S4 (see also FIG. 5) are configured. The vertical / horizontal positional relationship between the vertical sliding protrusion 38b (vertical sliding groove 22f) and the horizontal sliding protrusion 38c (horizontal sliding groove 5c) may be reversed.

  As a result, the orbiting scroll member 22 can slide in the vertical direction (the direction of the longitudinal sliding groove 22f) and the horizontal direction (the direction of the lateral sliding groove 5c) with respect to the partition member 5. In contrast, rotation is restricted. The orbiting scroll member 22 is only allowed to revolve with respect to the fixed scroll member 21 fixed to the partition wall member 5 via the compressor side housing 3 while maintaining the same direction in the circumferential direction. . By the revolving orbiting motion of the orbiting scroll member 22, the volume of the pair of variable volume chambers 28 defined between the wall bodies 21b and 22b of the fixed scroll member 21 and the orbiting scroll member 22 is smoothly increased or decreased.

  When the motor 12 is actuated to rotate the main shaft 14, this rotation causes the orbiting scroll member 22 to revolve with respect to the fixed scroll member 21 via the crank pin 14 b, the drive bush 31 and the drive bearing 32. The volume of 28 is increased / decreased, and intake, compression, and exhaust operations are continuously performed. As a result, low-pressure refrigerant gas is drawn from a refrigerant gas suction port (not shown) provided at the end of the motor-side housing 4, and the refrigerant 8 generates high heat while flowing through the motor-side housing 4 and the electric motor 12. After cooling, the air flows into the compressor side housing 3 through the air inlet 5a of the partition wall member 5.

  The refrigerant gas that has flowed into the compressor-side housing 3 is sucked into the variable volume chamber 28, compressed, and discharged from a discharge port (not shown) provided at the end of the compressor-side housing 3 at a high pressure. Since the height of the variable volume chamber 28 is small in the middle of the spiral shape with the step portion 22d as a boundary, the variable volume chamber 28 has a variable volume when the volume is reduced (during the compression process). Not only the width dimension of the chamber 28 but also the height dimension is reduced, thereby improving the compression efficiency of the refrigerant gas.

  The refrigerant gas contains oil, and this oil component is mist-like and drifts in the housing 2. In the motor-side housing 4, the main bearing 18, the sub-bearing 19, etc. are lubricated, and the compressor-side housing 3 Inside, the fixed scroll member 21 and the orbiting scroll member 22 that are precisely combined, the crank pin 14b, the drive bush 31, the drive bearing 32, and the like are lubricated.

Next, the main part of the present invention will be described.
An oil return passage 41 is formed in the end plate 22 a of the orbiting scroll member 22. The oil return passage 41 is provided near the inverter 8 of the orbiting scroll member 22, that is, near the upper portion of the end plate 22a. The oil return passage 41 penetrates the end plate 22a and is located behind the variable volume chamber 28 and the end plate 22a (partition wall). It is formed in a small hole shape communicating with the space on the member 5 side. The oil return passage 41 has an inner diameter of about 0.3 mm to 2 mm. In this embodiment, the oil return passage 41 is formed in a straight passage shape that penetrates the end plate 22a at a right angle. However, the oil return passage 41 may be inclined, bent, or other shapes depending on circumstances.

  The oil return passage 41 is formed such that the opening on the side of the variable volume chamber 28 communicates with the above-described step portion 22d formed on the end plate 22a of the orbiting scroll member 22, while the partition member 5 side Is formed so as to communicate with any one of the four sliding portions S1 to S4 of the rotation restricting mechanism 37. Preferably, the four sliding portions S1 to S4 are formed so as to communicate with the uppermost sliding portion S1. The oil return passage 41 opens at the bottom surface of the longitudinal sliding groove 22f in the sliding portion S1.

  Further, as shown in FIG. 2 and FIG. 5, the swivel is performed so as to connect between the sliding portion S1 provided with the oil return passage 41 and the sliding portions S2 to S4 not provided with the oil return passage 41. An annular oil supply groove 42 is formed on the back surface of the end plate 22 a of the scroll member 22. The oil supply groove 42 is engraved concentrically around the center point O on the back surface of the circular end plate 22a. The oil supply groove 42 is cut by the vertical sliding groove 22f at the upper and lower sliding portions S1 and S3.

  The oil supply groove 42 has a V-shaped cross section with an acute angle to a right angle, but may have a U-shape or a square cross section. Further, the oil supply groove 42 may be formed on the thrust surface 5b side of the partition wall member 5 facing the back surface of the end plate 22a, or may be formed on both the back surface of the end plate 22a and the thrust surface 5b. Furthermore, the oil supply groove 42 does not necessarily need to be formed in a circular shape, and may be an irregular shape such as an ellipse.

By forming the oil return passage 41 and the oil supply groove 42 as described above, the following operational effects can be obtained.
That is, as described above, the refrigerant gas contains an oil component, and the oil sucked into the variable volume chamber 28 together with the refrigerant gas lubricates between the fixed scroll member 21 and the orbiting scroll member 22. This oil mainly accumulates in a liquid state in the step 22d inside the variable volume chamber 28. The oil accumulated in the stepped portion 22d is supplied to the back side of the orbiting scroll member 22 through the oil return passage 41 formed so as to communicate with the stepped portion 22d due to the high pressure in the variable volume chamber 28. First, it flows into the longitudinal sliding groove 22f at the uppermost sliding portion S1 of the rotation restricting mechanism 37 that prevents the orbiting scroll member 22 from rotating.

  The oil that has flowed into the longitudinal sliding groove 22f lubricates between the longitudinal sliding protrusion 38b of the ring body 38a and the longitudinal sliding groove 22f, and the oil overflowing from this flows through the oil supply groove 42 to the left and right. It is supplied to the sliding portions S2 and S4, and further flows through the oil supply groove 42 from here to be supplied to the lowermost sliding portion S3. Therefore, in the four sliding portions S1 to S4, the space between the longitudinal sliding protrusion 38b and the longitudinal sliding groove 22f and the space between the lateral sliding protrusion 38c and the lateral sliding groove 5c are effectively lubricated. The revolving orbiting motion of the orbiting scroll member 22 becomes very smooth.

  Since the oil supply groove 42 is formed near the inverter 8, the oil discharged from the oil return passage 41 to the back side of the orbiting scroll member 22 is good for the refrigerant gas whose temperature has risen after the inverter 8 has been cooled. To the inside of the housing 2. For this reason, the main bearing 18 and the sub-bearing 19 of the electric motor 12 provided on the back side of the orbiting scroll member 22 are well lubricated by the refrigerant gas in which the oil component is well mixed.

  Since the oil supply groove 42 is provided on the upper side of the housing 2 together with the inverter 8, the oil discharged from the oil return passage 41 flows downward due to gravity and is provided below the oil return passage 41. It is possible to flow to each lubricated portion, and this can also lubricate each lubricated portion satisfactorily.

  Further, since the oil supply groove 42 is formed so as to communicate with the step portion 22d inside the variable volume chamber 28, the oil is directly sent to the oil return passage 41 from the step portion 22d where the oil easily accumulates. It is possible to increase the lubrication performance of each part by increasing the discharge amount.

  Further, the oil return passage 41 is formed so as to communicate with the uppermost sliding portion S1 of the rotation restricting mechanism 37 that prevents the turning scroll member 22 from rotating. Since the oil supply groove 42 communicating with the sliding portions S2 to S4 is formed in an annular shape, the plurality of sliding portions S1 to S4 can be lubricated in order from the top, and the number of oil return passages 41 is required. It is possible to prevent the compression efficiency from being lowered due to the pressure in the variable volume chamber 28 being excessively released to the back side of the orbiting scroll member 22 while keeping it to a minimum. Since the oil supply groove 42 has a V-shaped cross-sectional shape, the oil positively advances in the oil supply groove 42 by a capillary phenomenon, so that the oil supplied to the lower sliding portions S2 to S4. The amount can be increased.

  As described above, the oil that has been supplied to the variable volume chamber 28 together with the refrigerant gas is formed by a very simple and compact structure in which the oil return passage 41 and the oil supply groove 42 are formed in the end plate 22a of the orbiting scroll member 22. By utilizing this, sufficient lubrication can be performed at a predetermined lubrication location.

  In addition, since the excess oil supplied to the variable volume chamber 28 is discharged from the oil return passage 41, it is necessary to separate the excess oil from the refrigerant gas by the oil separation cylinder provided on the discharge chamber side as in the prior art. The oil separation cylinder can be reduced or the housing 2 can be made compact accordingly. Further, it is not necessary to form a long oil passage for returning oil to the suction chamber side, and the structure of the housing 2 and the like can be simplified. It is also conceivable that the oil supply groove 42 is not formed in a circular shape so as to be connected to all of the sliding portions S1 to S4, but is formed, for example, in the upper half or the left and right halves for a half circumference.

[Second Embodiment]
Next, a second embodiment of the present invention will be described with reference to FIG. In this 2nd Embodiment, the same code | symbol is attached | subjected to the part similar to 1st Embodiment shown in FIG. 5, and description is abbreviate | omitted.

  Here, the rotation regulating mechanism 51 that regulates the rotation of the orbiting scroll member 22 does not use an anti-rotation ring, and the partition wall (not shown) is formed in the four ring holes 22g formed in the end plate 22a of the orbiting scroll member 22. It is a known pin-ring type in which four pins 52 projecting from the thrust surface of the member are loosely fitted. These four ring holes 22g and the four pins 52 constitute four sliding portions S1 to S4. In this pin-ring type rotation restricting mechanism 51, each pin 52 revolves in the circumferential direction in each ring hole 22g, so that the rotation of the orbiting scroll member 22 is restricted. A revolving turning motion is made possible with respect to a fixed scroll member (not shown) fixed to the member.

  And the oil return channel | path 41 similar to 1st Embodiment is provided so that it may lead to the sliding part S1 located in the uppermost part among the four sliding parts S1-S4 of the rotation control mechanism 51. . The oil return passage 41 opens at the bottom surface of the ring hole 22g that constitutes the sliding portion S1. In addition, oil is provided on the rear surface of the end plate 22a of the orbiting scroll member 22 so as to connect between the sliding portion S1 provided with the oil return passage 41 and the sliding portions S2 to S4 not provided with the oil return passage 41. A supply groove 42 is formed. The shape and the like of the oil supply groove 42 are the same as those in the first embodiment.

  In this configuration, when the compression mechanism 11 is operated, the oil contained in the refrigerant gas becomes liquid and is supplied from the oil return passage 41 to the back side of the orbiting scroll member 22, and the uppermost slide of the rotation restriction mechanism 51. In the moving part S1, the pin 52 rotating in the ring hole 22g is lubricated, and the oil overflowing from this flows through the oil supply groove 42 and is supplied to the left and right sliding parts S2 and S4. It flows through the supply groove 42 and is supplied to the lowermost sliding portion S3. For this reason, the four sliding portions S1 to S4 are effectively lubricated.

[First Modification]
Next, a first modification of the present invention will be described with reference to FIG. The configuration of the first modification is substantially the same as that of the first embodiment shown in FIG. 5, but the position of the oil return passage 41 that opens to the back side of the end plate 22 a of the orbiting scroll member 22 is the top. It opens not in the sliding part S1 but in the oil supply groove 42 in the vicinity of the sliding part S1. The effect by this is the same as that of 1st Embodiment. The oil discharged from the oil return passage 41 is supplied to the four sliding portions S1 to S4 through the oil supply groove 42 and lubricates them.

[Second Modification]
Next, a second modification of the present invention will be described with reference to FIG. The configuration of the second modification is substantially the same as that of the second embodiment shown in FIG. 6, but the position of the oil return passage 41 that opens to the back side of the end plate 22 a of the orbiting scroll member 22 is the top. It opens not in the sliding part S1 but in the oil supply groove 42 in the vicinity of the sliding part S1 as in the first modification. The effect by this is the same as that of 2nd Embodiment and a 1st modification. The oil discharged from the oil return passage 41 is supplied to the four sliding portions S1 to S4 through the oil supply groove 42 and lubricates them.

  In addition, although each said embodiment and modification demonstrated the electric scroll compressor which operates a compression mechanism with an electric motor as an example, in the scroll compressor which operated the compression mechanism with external motive power, such as an engine, etc. The configuration of the main part of the present invention, that is, the oil return passage is formed in the end plate of the orbiting scroll member, and the oil supplied into the variable volume chamber is installed on the back side of the orbiting scroll member by the oil return passage. A configuration in which oil is supplied to the sliding portion of the rotation regulating mechanism can be applied.

DESCRIPTION OF SYMBOLS 1 Scroll compressor 2 Housing 5 Partition member 5b Thrust surface 8 Inverter 11 Compression mechanism 12 Electric motor 14 Main shaft 21 Fixed scroll member 22 Orbiting scroll member 22a End plate 22d Step part 28 Variable volume chamber 37 Rotation restriction mechanism 41 Oil return path 42 Oil supply Groove S1-S4 Sliding part

Claims (6)

The fixed scroll member and the orbiting scroll member are combined, and the orbiting scroll member is caused to revolve with respect to the fixed scroll member by an electric motor, whereby refrigerant gas is supplied to the variable volume chamber defined between the two scroll members. While the refrigerant gas is sucked and compressed and discharged, the oil contained in the refrigerant gas is lubricated between the scroll members, and an inverter for controlling the electric motor is integrally formed. In the provided scroll compressor,
An oil return passage for supplying oil supplied into the variable volume chamber to the back side of the orbiting scroll member is formed in an end plate of the orbiting scroll member, and the oil return passage is disposed at a portion near the inverter. A scroll compressor characterized by that.   The scroll compressor according to claim 1, wherein the inverter is provided on an upper portion of a housing of the scroll compressor.   3. The scroll compressor according to claim 1, wherein the oil return passage is formed so as to communicate with a step portion inside the variable volume chamber.   The scroll compressor according to any one of claims 1 to 3, wherein the oil return passage is formed so as to communicate with a sliding portion of a rotation restricting mechanism that prevents rotation of the orbiting scroll member.   A plurality of sliding portions of the rotation restricting mechanism are provided, the oil return passage is formed to communicate with at least one of the plurality of sliding portions, the sliding portion provided with the oil return passage, An oil supply groove is formed on at least one of the rear surface of the end plate of the orbiting scroll member or the thrust surface of the member facing the rear surface so as to connect to the sliding portion not provided with the oil return passage. The scroll compressor according to claim 4, wherein the scroll compressor is provided. The fixed scroll member and the orbiting scroll member are combined, and a rotation restricting mechanism for the orbiting scroll member is provided, and by rotating the orbiting scroll member with respect to the fixed scroll member, the orbiting scroll member is rotated between the two scroll members. A scroll configured to suck refrigerant gas into a defined variable volume chamber, compress the refrigerant gas, and discharge the refrigerant gas, while lubricating the scroll members with oil contained in the refrigerant gas. In the compressor,
An oil return passage for supplying oil supplied into the variable volume chamber to the back side of the orbiting scroll member is formed in an end plate of the orbiting scroll member, and the oil return passage is provided in the rotation restricting mechanism. A scroll compressor characterized by being formed to communicate with at least the uppermost sliding portion of the plurality of sliding portions.

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