JP2013204488A - Scroll type fluid machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a scroll type fluid machine capable of maintaining an oil discharge rate properly while the reliability of a thrust surface is enhanced.SOLUTION: A bottom surface of a thrust bearing 104 of a scroll compressor (A) is formed with a groove 104b having communication intermittently with an Oldham accommodation part 107 formed inside a frame 103 in association with the swinging motion of a swing scroll 101, and a refrigerating machine oil 120 is supplied to a center side of the frame 103 through an oil passage 42 in a crankshaft 112, and the thrust bearing 104 is lubricated by the refrigerating machine oil 120 sent via the Oldham accommodation part 107 and the groove 104b.

Description

  The present invention relates to a scroll fluid machine applied to a scroll compressor suitable for a refrigeration / air-conditioning apparatus using, for example, a vapor compression refrigeration cycle.

  A fixed scroll and an orbiting scroll, which are main components of a scroll compressor that is widely used, generally have a structure in which a spiral is erected on an end plate. The orbiting scroll has a thrust surface on which a thrust load acts on the back surface side of the end plate opposite to the spiral formation surface of the end plate. In the scroll compressor, the thrust load acting on the thrust surface and the balance of the amount of oil supplied to the thrust surface greatly affect the reliability of the thrust surface, that is, the reliability of the scroll compressor.

  The bearing portion of the scroll compressor is classified into a bearing portion (radial bearing) that supports a radial load and a bearing portion (thrust bearing) that supports an axial load. These bearing portions are generally lubricated by a forced oil supply system in which oil is directly supplied mainly using a positive displacement pump or the like. The lubricating oil that is forcibly supplied to the thrust surface flows into the compression chamber after the thrust surface is lubricated, which causes a problem of increased oil rise. In order to improve energy efficiency and reliability, it is necessary to deal with both problems of ensuring reliability by forced oiling on the thrust surface and reducing oil rise. Oil rising is oil that is taken out of the scroll compressor together with the refrigerant.

  For such a problem, for example, a scroll compressor having a structure in which a thrust bearing is arranged on the outer peripheral side of an Oldham joint has been proposed. As such, grooves (first oil flow path 25c, second oil flow path 25d) are provided in the thrust bearing, and the oil after lubricating the Oldham joint disposed in the frame is formed in the thrust bearing. The oil is continuously guided into the groove and flows in the circumferentially extending groove (second oil passage 25d), and an oil sump (oil return hole 26) provided in the groove allows an oil reservoir below the compressor to be stored. A scroll compressor that returns oil has been proposed (see, for example, Patent Document 1).

Japanese Patent No. 2616128 (FIG. 1, FIG. 2, etc.)

  In a scroll compressor, improvement of reliability is a problem that has been demanded conventionally, and it is particularly important to maintain the oil rising rate appropriately while improving the reliability of the thrust surface on which the thrust load acts. . The technology described in Patent Document 1 has a structure in which oil is continuously supplied into a groove provided in a thrust bearing, so that the reliability of the thrust surface can be improved. However, the oil after lubricating the thrust surface can be improved. The amount of inflow into the compression chamber also increased, and there was room for improvement with respect to oil rise.

  The present invention was made to solve the above-described problems, and provides a scroll fluid machine that can maintain the oil rising rate appropriately while improving the reliability of the thrust surface. It is an object.

  The scroll type fluid machine according to the present invention includes a fixed scroll in which a spiral projection is erected on one surface of the end plate, and a spiral projection that is erected on one surface of the end plate. The swing scroll disposed so as to be engaged with the spiral protrusion, the Oldham joint disposed on the back side of the swing scroll to prevent the swing scroll from rotating, and the Oldham joint are accommodated. An Oldham container, a frame having a thrust surface that slidably supports the swing scroll, a thrust bearing that swings with the swing scroll and slides on the thrust surface on the back side of the swing scroll; An oil passage formed therein, and a crankshaft for swinging the swing scroll, the thrust bearing side of the thrust bearing having the swing shaft A groove intermittently communicating with the Oldham accommodating portion formed on the inner side of the frame with the swinging motion of the roll is formed, and the thrust bearing is inserted into the frame via the oil passage of the crankshaft. Is supplied to the Oldham housing part from the center side of the oil, and is lubricated with the refrigerating machine oil guided to the groove when communicating with the Oldham housing part.

  According to the scroll type fluid machine of the present invention, since the groove that intermittently communicates with the Oldham accommodating portion formed on the inner side of the frame with the swinging motion of the swing scroll is formed on the bottom surface of the thrust bearing, the thrust bearing The oil rise rate can be lowered while ensuring high reliability.

It is a longitudinal section showing an example of section composition of a scroll compressor concerning an embodiment of the invention. It is explanatory drawing for demonstrating the flame | frame provided in the scroll compressor which concerns on embodiment of this invention. It is a schematic block diagram which expands and shows the structure of the compression part of the scroll compressor which concerns on embodiment of this invention. It is a bottom view which shows the structural example of the thrust bearing of the scroll compressor which concerns on embodiment of this invention. It is a bottom view which shows the other structural example of the thrust bearing of the scroll compressor which concerns on embodiment of this invention. It is a schematic diagram for demonstrating the positional relationship of the thrust bearing and flame | frame of the scroll compressor which concerns on embodiment of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a longitudinal sectional view showing a sectional configuration example of a scroll compressor A according to an embodiment of the present invention. An outline of the configuration of the scroll compressor A will be described with reference to FIG. The scroll compressor A is one of the components of a vapor compression refrigeration cycle used in various industrial machines such as a refrigerator, a freezer, a vending machine, an air conditioner, a refrigeration apparatus, and a water heater. In addition, in the following drawings including FIG. 1, the relationship of the size of each component may be different from the actual one. In the embodiment, a scroll compressor A, which is a typical scroll fluid machine, will be described as an example.

[Schematic configuration of scroll compressor A]
The scroll compressor A sucks a fluid such as a refrigerant, compresses it, and discharges it as a high-temperature and high-pressure state. The scroll compressor A can be roughly classified into a compression unit 20 and a drive unit 30. The compression part 20 and the drive part 30 are accommodated in the airtight container (shell) 10 which is a pressure vessel. As shown in FIG. 1, the compression unit 20 is disposed on the upper side of the sealed container 10, and the drive unit 30 is disposed on the lower side of the sealed container 10. The bottom of the sealed container 10 is an oil sump 11 for storing the refrigerating machine oil 120. The closed container 10 is connected to a suction side pipe 12 for sucking a fluid and a discharge side pipe 13 for discharging the fluid.

  First, the compression unit 20 will be described. The compression unit 20 performs a function of compressing the fluid sucked from the suction side pipe 12 and discharging it to the discharge space 15 in the sealed container 10. The fluid discharged into the discharge space 15 is discharged from the discharge side pipe 13 to the outside of the scroll compressor A. The compression unit 20 includes a swing scroll 101, a fixed scroll 100, and a frame 103.

  The fixed scroll 100 includes an end plate 100a and a wrap 100b that is a spiral projection provided on one surface of the end plate 100a. The orbiting scroll 101 is composed of an end plate 101a and a wrap 101b which is a spiral projection standing on one surface of the end plate 101a. Then, the wrap 100b of the fixed scroll 100 and the wrap 101b of the swing scroll 101 are engaged with each other so that a compression chamber 21 whose volume is relatively changed is formed between the wrap 100b and the wrap 101b. It has become.

  The fixed scroll 100 is fastened and fixed to the frame 103 by an unillustrated bolt or the like on the outer periphery. A discharge port 63 is formed at the center of the fixed scroll 100 to discharge the compressed and high pressure fluid. The compressed high-pressure fluid is discharged into the discharge space 15 provided in the upper part of the fixed scroll 100. Note that the present invention is not limited to the case where the fixed scroll 100 is fixed with a bolt or the like, and the fixed scroll 100 may be fixed to the frame 103.

  The orbiting scroll 101 performs a revolving orbiting motion without rotating about the fixed scroll 100. A hollow cylindrical rocking scroll boss 101c is formed at the center of the surface of the rocking scroll 101 opposite to the surface on which the lap 101b is formed (hereinafter referred to as the back surface 101d). . An eccentric pin portion 41 provided at the upper end portion of the crankshaft 112 is rotatably engaged with the swing scroll boss portion 101c. The swing scroll 101 is disposed in the housing portion 103 d of the frame 103, and the back surface 101 d is slidable with the frame 103.

  The frame 103 supports the orbiting scroll 101 and the fixed scroll 100 and is fixed inside the sealed container 10. For example, the outer peripheral surface of the frame 103 is fixed to the sealed container 10 by shrink fitting, welding, or the like. Further, a main bearing 103a for pivotally supporting the drive unit 30 (particularly, the crankshaft 112) is formed at the center opening of the frame 103 (same as the center opening 103g shown in the figure). The frame 103 will also be described with reference to FIGS.

  In addition, an Oldham joint 110 is disposed between the orbiting scroll 101 and the fixed scroll 100 to prevent the rotation of the orbiting scroll 101 during the eccentric orbiting motion. That is, the Oldham joint 110 functions as a rotation prevention mechanism for the swing scroll 101. The Oldham joint 110 is formed such that at least two claws (the claws 110a shown in FIG. 3) fitted into the Oldham joint groove 103b formed in the frame 103 protrude downward. In addition, at least two claws (the claws 110b shown in FIG. 3) that fit into Oldham joint grooves (not shown) formed on the back surface 101d of the orbiting scroll 101 protrude upward from the Oldham joint 110. Is formed.

  The Oldham coupling 110 has a predetermined direction (a linear direction connecting the two Oldham coupling grooves 103b and a linear direction perpendicular to the linear direction) by fitting the claws into the Oldham coupling grooves 103b and the Oldham coupling grooves of the swing scroll 101. ) Can reciprocate (slide). That is, the Oldham joint 110 can reciprocate back and forth and right and left by each claw and each Oldham joint groove that accommodates it. Therefore, by providing the Oldham coupling 110, the orbiting scroll 101 can be revolved while preventing the orbiting scroll 101 from rotating.

  Next, the drive unit 30 will be described. The drive unit 30 serves to drive the orbiting scroll 101 constituting the compression unit 20 in order to compress the fluid by the compression unit 20. The drive unit 30 includes a crankshaft 112, a rotor 114 fixed to the crankshaft 112, and a stator 111 fixed to the sealed container 10. The rotor 114 is rotationally driven in a certain direction by energizing the stator 111. The outer surface of the stator 111 is fixed to the sealed container 10 by shrink fitting or the like, and the rotor 114 is rotated. The rotor 114 and the stator 111 constitute the main part of the electric motor.

  An upper end portion of the crankshaft 112 is formed with an eccentric pin portion 41 that is rotatably engaged with the swing scroll boss portion 101c of the swing scroll 101. Further, an oil passage 42 communicating with the upper end surface is formed inside the crankshaft 112. This oil flow path 42 becomes a flow path of the refrigerating machine oil 120 stored in the sump 11. The refrigerating machine oil 120 that is conducted through the oil flow path 42 is supplied to the main bearing 103 a of the frame 103, the swing scroll boss portion 101 c, and the sliding portion between the swing scroll 101 and the frame 103.

[Configuration of Frame 103]
FIG. 2 is an explanatory diagram for explaining the frame 103 provided in the scroll compressor A. FIG. The frame 103 will be described in detail based on FIG. 2A is a top view of the frame 103, and FIG. 2B is a cross-sectional view taken along the line A-O-A in FIG. 2A. Further, O shown in FIG. 2A represents the axis center of the scroll compressor A.

  As shown in FIGS. 2 (a) and 2 (b), an opening (hereinafter referred to as a center opening 103g) is formed in the lower portion of the center of the frame 103 so as to penetrate vertically. A main bearing 103a is provided on the inner wall of the central opening 103g as shown in FIG. Further, a boss portion accommodating portion 103e is formed between the center opening 103g of the frame 103 and the accommodating portion 103d so that the orbiting scroll boss portion 101c of the orbiting scroll 101 is accommodated so as to be able to turn.

  Further, as shown in FIG. 2B, an Oldham housing part 107 having a diameter smaller than the diameter of the housing part 103d and larger than the diameter of the boss part housing part 103e is provided below the housing part 103d of the frame 103. Is formed. The Oldham storage part 107 is located on the inner side of the thrust surface 103c provided on the bottom surface of the storage part 103d, is lower in height than the thrust surface 103c, and is higher in height than the bottom surface of the boss part storage part 103e. In this way, a step is provided. In other words, the frame 103 is formed with an accommodation portion 103d, an Oldham accommodation portion 107, a boss portion accommodation portion 103e, and a central opening portion 103g so that their diameters become smaller from the upper side of the page, and they communicate with each other. It has become.

  Further, as shown in FIG. 2A, a claw of the Oldham coupling 110 for preventing the rotation of the orbiting scroll 101 (claw 110a shown in FIG. 3) is fitted to the bottom surface of the Oldham accommodating portion 107 of the frame 103. Two Oldham joint grooves 103b to be joined are provided in parallel at opposite positions around the axis center O. Further, a thrust surface 103c for receiving a thrust load is provided outside the Oldham joint groove 103b of the frame 103, that is, on the bottom surface of the housing portion 103d. Note that the bottom surface of the housing portion 103d may function as the thrust surface 103c.

  An oil drain hole 105 for returning the refrigerating machine oil 120 supplied into the frame 103 to the lower side of the scroll compressor A is provided in a part of the bottom surface of the Oldham storage unit 107. The oil drain hole 105 is formed so as to be inside the inner periphery of the thrust bearing 104 when the swing scroll 101 is disposed in the frame 103. The oil drain hole 105 communicates with the central opening of the frame 103 via a groove 105 a whose upper end opening is formed in a part of the bottom surface of the Oldham housing part 107. Further, the oil drain hole 105 is formed so as to penetrate the Oldham accommodating portion 107 and the lower end side of the frame 103.

  An oil drain pipe 105b is fixed to the oil drain hole 105 as shown in FIG. The oil drain pipe 105 b is fixed to the oil drain hole 105 by inserting its tip (upper end) to the vicinity of the upper end opening of the oil drain hole 105. The oil drain pipe 105b is bent at the lower end side of the frame 103 so as to avoid the electric motor, and extends outward on the outer peripheral side of the electric motor. Two or more oil drain holes 105 may be formed. Further, the groove 105 a formed in a part of the bottom surface of the Oldham housing part 107 is formed so as to extend in the radial direction around the crankshaft 112. As will be described with reference to FIG. 3, the thrust bearing 104 is provided as a separate member from the swing scroll 101 on the back surface 101d side.

[Detailed Configuration of Compression Unit 20]
FIG. 3 is a schematic configuration diagram showing the configuration of the compression unit 20 of the scroll compressor A in an enlarged manner. Based on FIG. 3, the compression part 20 of the scroll compressor A is demonstrated in detail. As shown in FIG. 3, in a state where the orbiting scroll 101 is installed on the frame 103, the orbiting scroll boss portion 101 c is accommodated in the boss portion accommodating portion 103 e of the frame 103. Further, the Oldham coupling 110 is provided on the back surface 101 d side of the orbiting scroll 101 in a state of being accommodated in the Oldham accommodating portion 107. 3 schematically illustrates the flow of the refrigerating machine oil 120. In FIG. 3, the crankshaft 112 is not shown.

  As shown in FIG. 3, a thrust bearing 104, which is a separate member from the swing scroll 101, is disposed on the back surface 101 d side of the swing scroll 101. The thrust bearing 104 is positioned with respect to the orbiting scroll 101 by bolts 115 and is arranged on the back surface 101d side. In the scroll compressor A, a thin steel plate 106 is disposed on the thrust surface 103 c of the frame 103. Therefore, when the orbiting scroll 101 is driven, the thrust bearing 104 and the steel plate 106 slide on the thrust surface 103c while receiving a thrust load. In addition, the thickness and material of the steel plate 106 are not particularly limited, and may be determined from the relationship with each part.

[Configuration of Thrust Bearing 104]
FIG. 4 is a bottom view showing a configuration example of the thrust bearing 104 of the scroll compressor A. FIG. 5 is a bottom view showing another configuration example of the thrust bearing 104 of the scroll compressor A. FIG. Based on FIG.4 and FIG.5, the structure of the thrust bearing 104 is demonstrated in detail. As described above, the thrust bearing 104 is provided as a separate member from the orbiting scroll 101 on the back surface 101d side.

  As shown in FIGS. 4 and 5, notches 104a for avoiding interference with the Oldham coupling 110 are opened on both end surfaces (upper and lower end surfaces) of the thrust bearing 104 on the inner peripheral surface of the thrust bearing 104. Is formed. The thrust bearing 104 is disposed on the back surface 101d so that the position of the notch 104a substantially matches the position of the Oldham joint groove 103b. The lower surface of the thrust bearing 104 (the surface facing the thrust surface 103 c) is a position that does not communicate with the notch 104 a and is a space (inside the frame 103) along with the swinging (turning) motion of the swing scroll 101. That is, a groove 104b that is intermittently communicated with the Oldham accommodating portion 107) is formed. The groove 104b is formed to extend in the circumferential direction of the thrust bearing 104.

  FIG. 4 shows an example in which the groove 104b is divided into two so as not to communicate with the notch 104a. However, if the groove 104b does not communicate with the notch 104a, the number of grooves 104b is increased to three or more. It may be divided. Further, as shown in FIG. 5, the grooves 104b may be formed in a plurality of rows in the radial direction. In this case, the distance between the grooves 104 b arranged in the radial direction is set to be smaller than twice the swing radius of the swing scroll 101. Also in this case, if the grooves 104b do not communicate with the notch 104a, the grooves 104b in each row may be divided into any number, and the number of divisions of the one groove 104b and the other groove 104b may not be the same. Good.

Here, the operation of the scroll compressor A will be described with reference to FIG.
The rotor 114 constituting the electric motor rotates by receiving a rotational force from a rotating magnetic field generated by the stator 111. Along with this, the crankshaft 112 fixed to the rotor 114 is rotationally driven. The orbiting scroll 101 is engaged with the eccentric pin portion 41 of the crankshaft 112, and the rotating rotation motion of the orbiting scroll 101 is converted into the revolution turning motion by the rotation preventing mechanism of the Oldham joint 110. By the rotational drive of the crankshaft 112, the fluid in the sealed container 10 flows into the compression chamber 21 formed by the wrap 100b of the fixed scroll 100 and the wrap 101b of the orbiting scroll 101, and the suction process starts.

  When the fluid is sucked into the compression chamber 21, the revolving orbiting motion of the eccentric orbiting scroll 101 shifts to a compression process for reducing the volume of the compression chamber 21. In this compression process, the pressure of the fluid in the compression chamber 21 increases. Due to the action of the gas pressure, the thrust bearing 104 and the steel plate 106 provided on the back surface 101d slide while being pressed by the thrust load. Further, the Oldham joint 110 receives the gas load applied to the direction opposite to the rotation direction of the orbiting scroll 101 acting on the orbiting scroll 101 by the claws 110a and 110b, so that the claws 110a and 110b are in the Oldham joint grooves. Slide on.

  And the fluid compressed by the compression chamber 21 transfers to a discharge process. After the fluid in the compression chamber 21 in the compression process communicates with the discharge port 63, the process proceeds to the discharge process. In the discharge process, the fluid is discharged from the discharge port 63 of the fixed scroll 100 to the discharge space 15 and discharged from the discharge side pipe 13 to the outside of the scroll compressor A.

Next, the flow of the refrigerating machine oil 120 will be described with reference to FIG.
The refrigerating machine oil 120 stored in the sump 11 of the sealed container 10 is conducted through the oil passage 42 of the crankshaft 112 (arrow (1) shown in FIG. 1), and the height position of the main bearing 103a of the frame 103 is reached. Thus, the oil is divided into an oil supply hole (not shown) provided in the radial direction of the crankshaft 112 and the upper end surface side of the crankshaft 112. The refrigerating machine oil 120 that has flowed into an oil supply hole (not shown) is supplied to the main bearing 103a of the frame 103 and lubricates the crankshaft 112 and the main bearing 103a (arrow (2) shown in FIG. 1).

  On the other hand, the refrigerating machine oil 120 that has flowed into the upper end surface side of the crankshaft 112 has an oil supply hole (not shown) provided in the radial direction of the crankshaft 112 at the height position of the orbiting scroll boss 101c, It is divided into the end face side. The refrigerating machine oil 120 that has flowed into the oil supply hole (not shown) lubricates the eccentric pin portion 41 and the rocking bearing portion of the rocking scroll boss portion 101c, and from below the rocking bearing portion as shown by an arrow A in FIG. It flows into the boss part accommodating part 103e side of the frame 103 (arrow (3) shown in FIG. 1).

  The refrigerating machine oil 120 flowing into the boss portion accommodating portion 103e is then supplied to the Oldham accommodating portion 107 of the frame 103, which is the tip of the arrow A in FIG. The refrigerating machine oil 120 flowing into the Oldham accommodating portion 107 of the frame 103 mainly flows into the Oldham joint groove 103b, and after the sliding portion is lubricated, it is sealed from an oil drain hole 105 provided inside the thrust bearing 104. 10 is returned to the sump 11 below.

[Relationship between thrust bearing 104 and frame 103]
FIG. 6 is a schematic diagram for explaining the positional relationship between the thrust bearing 104 and the frame 103 of the scroll compressor A. FIG. Based on FIG. 6, the relationship between the groove | channel 104b of the thrust bearing 104 and the flame | frame 103 accompanying the rocking | fluctuation motion of the rocking scroll 101 is demonstrated. Note that FIG. 6 shows a state where the transition of the swing motion of the swing scroll 101 is viewed from the bottom surface side. For convenience of explanation, FIG. 6 shows an example in which the state when the swing scroll 101 starts swinging is (a), and then the state changes sequentially to (d). Therefore, the state when the swing scroll 101 starts swinging is not limited to (a). In FIG. 6, the groove 104b on the right side of the paper surface is referred to as the groove 104b1, and the groove 104b on the left side of the paper surface is referred to as the groove 104b2.

  As shown in FIG. 6, the swing scroll 101 swings while being supported by the frame 103. In FIG. 6, the outermost periphery represents the outer periphery of the frame 103. Further, in FIG. 6, members other than the frame 103 and the thrust bearing 104 are not shown for easy understanding of the swing operation of the swing scroll 101. Although the orbiting scroll 101 is hidden behind the thrust bearing 104, the movement of the orbiting scroll 101 is the same as that of the thrust bearing 104.

  As shown in FIG. 6, when the orbiting scroll 101 is oscillated while being supported by the frame 103, the thrust bearing 104 that is positioned on the back surface 101 d side of the oscillating scroll 101 is positioned together with the bolt 115. Swing motion.

  First, in a state where the orbiting scroll 101 starts an orbiting motion, the groove 104b2 provided in the thrust bearing 104 and the Oldham accommodating portion 107 of the frame 103 communicate with the orbiting motion of the orbiting scroll 101 ( FIG. 6 (a) state). In this state, the refrigerating machine oil 120 supplied to the Oldham storage unit 107 is supplied to the groove 104b2. As described above, the refrigerating machine oil 120 that has flowed into the Oldham container 107 is returned to the oil drain hole 105, but a part of the oil is supplied to the groove 104b2 and used for lubricating the thrust surface 103c. It will be.

  On the other hand, in the state of FIG. 6A, the groove 104b1 and the Oldham accommodating portion 107 of the frame 103 are not in communication. That is, the groove 104b1 becomes a closed space by the thrust surface 103c. Then, the refrigerating machine oil 120 supplied in the groove 104b1 flows in the radial direction along with the swinging motion of the swing scroll 101, reaches the thrust surface 103c, and lubricates the thrust surface 103c.

  When the swinging motion of the swing scroll 101 proceeds by 90 °, the thrust bearing 104 changes to the state shown in FIG. Even at this time, the groove 104b2 and the Oldham accommodating portion 107 of the frame 103 are still in communication. On the other hand, the groove 104b1 also communicates with the Oldham accommodating portion 107 of the frame 103.

  When the rocking motion of the rocking scroll 101 further advances by 90 °, the thrust bearing 104 changes to the state shown in FIG. At this time, the groove 104b2 is not in communication with the Oldham accommodating portion 107 of the frame 103. That is, the groove 104b2 becomes a closed space by the thrust surface 103c. Then, the refrigerating machine oil 120 supplied in the groove 104b2 flows in the radial direction along with the swinging motion of the swing scroll 101, reaches the thrust surface 103c, and lubricates the thrust surface 103c.

  On the other hand, in the state of FIG. 6C, the state where the groove 104b1 and the Oldham accommodating portion 107 of the frame 103 communicate with each other is maintained. In this state, the refrigerating machine oil 120 supplied to the Oldham storage unit 107 is supplied to the groove 104b1. As described above, the refrigerating machine oil 120 that has flowed into the Oldham storage unit 107 is returned to the oil drain hole 105, but a part of the oil is supplied to the groove 104b1 and used for lubricating the thrust surface 103c. It will be.

  When the swinging motion of the swing scroll 101 further proceeds by 90 °, the thrust bearing 104 transitions to the state shown in FIG. That is, the groove 104b2 returns to the state where it communicates with the Oldham accommodating portion 107 of the frame 103. The refrigerating machine oil 120 that has lubricated the thrust surface 103c and has reached the outer peripheral side of the thrust bearing 104 is mixed with the sucked fluid, sucked into the compression chamber 21, and compressed. Even at this time, the groove 104b1 and the Oldham accommodating portion 107 of the frame 103 are still in communication.

  The width, depth, and position of the groove 104b formed in the thrust bearing 104 are not particularly limited, and the refrigerating machine oil 120 that flows into the compression chamber 21 by adjusting the communication time between the groove 104b and the Oldham accommodating portion 107 is not limited. It may be determined in consideration of the amount.

[Effects of scroll compressor A]
According to the scroll compressor A, since the thrust bearing 104 is formed with the groove 104b intermittently communicating with the Oldham accommodating portion 107 as the swinging scroll 101 swings, the refrigerating machine oil flowing into the compression chamber 21 is formed. The amount of 120 can be reduced. Further, according to the scroll compressor A, the refrigerating machine oil 120 can be forcibly supplied to the thrust surface 103 c through the groove 104 b formed in the thrust bearing 104. That is, according to the scroll compressor A, it becomes possible to maintain the oil rising rate appropriately while improving the reliability of the thrust surface 103c, and to exhibit high energy efficiency.

  Although the case where the groove 104b is formed in the thrust bearing 104 has been described above as an example, the groove 104b may be formed directly on the back surface 101d side of the orbiting scroll 101. Also in this case, the groove 104 b is formed at a position where the groove 104 b intermittently communicates with the Oldham accommodating portion 107 along with the swing scroll 101. Even if the groove 104b is formed on the swing scroll 101 side to constitute the scroll compressor A, the same effect as described above can be obtained. The scroll fluid machine according to the embodiment of the present invention can be applied not only to the scroll compressor A but also to a fluid machine such as a pump.

  DESCRIPTION OF SYMBOLS 10 Airtight container, 11 Oil sump, 12 Suction side piping, 13 Discharge side piping, 15 Discharge space, 20 Compression part, 21 Compression chamber, 30 Drive part, 41 Eccentric pin part, 42 Oil flow path, 63 Discharge port, 100 Fixation Scroll, 100a end plate, 100b wrap, 101 swing scroll, 101a end plate, 101b wrap, 101c swing scroll boss, 101d back, 103 frame, 103a main bearing, 103b Oldham's joint groove, 103c thrust surface, 103d storage, 103e Boss part accommodating part, 103g Center opening part, 104 Thrust bearing, 104a Notch part, 104b Groove, 105 Oil drain hole, 105a Groove part, 105b Oil drain pipe, 106 Steel plate, 107 Oldham joint part, 110 Oldham joint, 110a Claw, 110b Nails, 11 Stator, 112 crankshaft, 114 rotor, 115 volts, 120 refrigerating machine oil, A scroll compressor.

Claims (7)

A fixed scroll with spiral projections on one side of the end plate,
An orbiting scroll disposed so that a spiral protrusion is provided on one surface of the end plate, and the spiral protrusion is engaged with the spiral protrusion of the fixed scroll;
An Oldham coupling arranged on the back side of the orbiting scroll to prevent the orbiting scroll from rotating,
An Oldham housing part in which the Oldham coupling is housed, a frame having a thrust surface that slidably supports the swing scroll;
A thrust bearing that swings with the swing scroll and slides on the thrust surface on the back side of the swing scroll;
An oil passage is formed therein, and a crankshaft that swings the swing scroll, and
On the thrust surface side of the thrust bearing, a groove is formed that intermittently communicates with the Oldham accommodating portion formed on the inner side of the frame with the swinging motion of the swing scroll,
The thrust bearing is
It is supplied to the Oldham housing part from the center side of the frame through the oil flow path of the crankshaft, and is lubricated by the refrigerating machine oil guided to the groove when communicating with the Oldham housing part. Scroll type fluid machine. The thrust bearing is
The scroll fluid machine according to claim 1, wherein the scroll fluid machine is configured by a separate member or the same member as the swing scroll. The inner peripheral surface of the thrust bearing is formed with a notch formed so as to open to both end surfaces of the thrust bearing,
The groove is
The scroll fluid machine according to claim 1 or 2, wherein the scroll fluid machine is formed at a position not communicating with the notch. The groove is
The scroll fluid according to any one of claims 1 to 3, wherein a closed space is formed on the thrust surface in a state where the space is not communicated with a space formed inside the frame. machine. The groove is
The scroll fluid machine according to any one of claims 1 to 4, wherein the scroll fluid machine is formed to extend in a circumferential direction of the thrust bearing or the orbiting scroll. The groove is
The scroll type fluid machine according to any one of claims 1 to 5, wherein a plurality of rows are formed in a radial direction of the thrust bearing or the orbiting scroll. The distance between the grooves arranged in the radial direction is
The scroll fluid machine according to claim 6, wherein the scroll fluid machine is smaller than twice the rocking radius of the rocking scroll.

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