JP2009127614A - Scroll fluid machine and method of manufacturing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance reliability by securing an oil supply amount and improve an efficiency and reduce an oil storage amount by reducing the power loss and the oil rise amount of an oil feed pump in a scroll fluid machine. <P>SOLUTION: This scroll fluid machine comprises: an operation part 30 in which a fixed scroll 2 and a rotary scroll 3 are engaged with each other; an electric motor 40; a closed container 1 for storing the operation part 30 and the electric motor 40; a shaft 7 for transmitting the rotating force of the rotor 6 of the electric motor 30 to the operation part 30; a frame 4 pivotally supporting the shaft 7; and an oil feed mechanism 14 for feeding a lubricating oil 15 stored in the closed container 1 to the sliding part of the shaft 7. An oil passage 7a axially extending in the shaft 7 is partitioned, by a partition member 23, into an oil supply passage 13 through which the lubricating oil 15 fed from the oil feed mechanism 14 flows and an oil discharge passage 22 through which the lubricating oil 15 which has lubricated the sliding part of the shaft 7 flows from the electric motor 40 to the side opposite to the operation part. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a scroll fluid machine and a manufacturing method thereof. For example, the present invention relates to a scroll fluid machine such as a scroll compressor, a scroll expander, a scroll vacuum pump, and a scroll blower that handle a compressible gas or liquid such as a refrigerant, and a manufacturing method thereof. Is preferred.

  As a conventional scroll fluid machine, there is one disclosed in Japanese Patent Laid-Open No. 4-143489 (Patent Document 1).

  This scroll fluid machine includes a compression unit that forms a working chamber by meshing a first scroll and a second scroll each having a spiral wrap on each end plate, a motor including a stator and a rotor, a compression unit, and a motor. A sealed casing for housing, an oil supply passage and an oil discharge passage inside, a drive shaft that passes through the rotor and transmits the rotational force of the rotor to the compression portion, and a drive shaft that is supported on the compression portion side from the motor An upper housing having an upper bearing metal and an oil pump for supplying lubricating oil stored in the hermetic casing to a sliding portion of the drive shaft through an oil supply passage of the drive shaft are provided.

  In this scroll fluid machine, lubricating oil forcibly supplied by an oil supply pump installed at the lower end of the drive shaft is supplied to the upper portion through an oil supply passage provided in the drive shaft. A part of this lubricating oil is branched and supplied to the upper bearing metal through the lateral hole.

  Part of the lubricating oil that has lubricated the upper bearing metal is branched through the communication path and supplied to the thrust support surface of the second scroll. The remaining lubricating oil that has lubricated the upper bearing metal passes through the pin housing chamber of the upper housing and is discharged from the side surface of the upper housing to the upper space of the motor.

  On the other hand, the remaining lubricating oil that has not branched to the upper bearing metal passes through the gap formed between the upper end surface of the pin portion of the drive shaft and the back surface of the second scroll, and then reaches the outer periphery of the pin portion of the drive shaft. It is supplied to the oil pool provided. Part of the lubricating oil in the oil pool lubricates the pin bearing metal provided on the boss cylinder of the second scroll, and then passes through the pin housing chamber of the upper housing from the side surface of the upper housing to the upper space of the motor. Discharged. The remaining lubricating oil is discharged from the oil pool through the lateral hole to the oil discharge passage of the drive shaft, guided downward, and discharged to the lower space of the motor.

JP-A-4-14389

  In Patent Document 1 described above, since the oil supply passage and the oil discharge passage are independently formed inside the drive shaft, the oil supply passage is provided in the drive shaft of a scroll fluid machine that is required to have an outer diameter as thin as possible. In addition, it is difficult to ensure a large flow passage area of the oil discharge passage, and as a result, there is a problem that the amount of oil supply is reduced and reliability is impaired.

  Further, in Patent Document 1, since lubricating oil is branched from the oil supply passage of the drive shaft and supplied to the upper bearing metal and the pin bearing metal, in order to ensure high reliability of these bearing metals. Therefore, the total amount of oil supplied and the amount of oil stored in the compressor must be set to be large, and there is a problem that the power loss in the oil pump and the like is increased and the efficiency is lowered.

  Further, in Patent Document 1, since the lubricating oil that lubricates the upper bearing metal and the pin bearing metal is discharged from the side surface of the upper housing to the space above the motor, the discharged lubricating oil is agitated by the motor to be mist. There is a problem that the amount of oil rising is increased by being mixed with the discharge gas in the hermetic casing and discharged to the outside of the compressor.

  Further, in Patent Document 1, since it is necessary to separate the oil supply passage and the oil discharge passage inside the drive shaft, a large centrifugal force is applied to the lubricating oil flowing through the oil supply passage and the oil discharge passage as the drive shaft rotates. Is likely to cause vibration and noise, which may impair reliability.

  An object of the present invention is to improve the reliability by securing the oil supply amount with a simple configuration, and to improve the efficiency and reduce the oil storage amount by reducing the power loss and the oil up amount of the oil pump. It is an object of the present invention to provide a scroll fluid machine that can perform the above.

  Another object of the present invention is to provide a scroll capable of ensuring the amount of oil supply and improving the reliability, reducing the power loss and the oil up amount of the oil pump, and improving the efficiency and reducing the oil storage amount. An object of the present invention is to provide a manufacturing method capable of easily manufacturing a fluid machine.

  In order to achieve the above-mentioned object, the present invention provides an operation part that forms a working chamber by meshing a fixed scroll and a turning scroll each having a spiral wrap on each end plate, an electric motor comprising a stator and a rotor, An airtight container that houses the operating part and the electric motor, an oil supply passage and an oil discharge passage inside, a shaft that is installed through the rotor of the electric motor, and that transmits the rotational force of the rotor to the operating part; A frame having a main bearing that pivotally supports the shaft on the operating portion side from the electric motor, and an oil supply mechanism that supplies lubricating oil stored in the sealed container to the sliding portion of the shaft through the oil supply passage. In the scroll fluid machine provided, lubricating oil supplied from the oil supply mechanism flows through an oil passage provided in the shaft so as to extend in the axial direction by a partition member. That the the oil supply passage is that the lubricating oil lubricates the sliding portion of the shaft is partitioned into said oil discharge passage flows to the counter actuating portion side of the electric motor.

A more preferable specific configuration example in the present invention is as follows.
(1) The orbiting scroll includes an orbiting bearing that supports an eccentric portion of the shaft, and the lubricating oil supplied from the oil supply passage flows in series to the orbiting bearing and the main bearing and is then discharged to the oil discharge passage. It was set as the structure to do.
(2) In (1), the oil supply passage is provided penetrating in the longitudinal direction of the shaft, and the lubricating oil supplied from the oil supply passage to the gap between the front end surface of the shaft and the back surface of the orbiting scroll is The swirl bearing and the main bearing are flowed in this order, and then discharged into the oil drain passage.
(3) In (2), a seal member is provided between the orbiting scroll and the frame to regulate a part of the lubricating oil that lubricates the orbiting bearing so as to branch a predetermined amount to the operating portion side. Was it.
(4) In the above (2), a secondary bearing member including a secondary bearing that pivotally supports the shaft on the side opposite to the motor from the electric motor is provided, and a part of the lubricating oil discharged to the oil drainage passage is partly removed from the secondary oil. It was configured to flow through the bearing.
(5) The oil passage is formed by a through-hole penetrating the shaft so that the oil passage does not communicate with a partition portion that divides the oil passage and the oil passage and an end face opening of the oil passage. The partition member is configured from a closing portion that is closed.
(6) In said (5), the said partition part and the said closing part are formed with the same member.
(7) In said (5), the said partition part and the said closing part are formed with another member.
(8) In the above (7), the oil passages are all configured with the same circular cross section in the longitudinal direction, and the partition member is substantially the same length as the oil passage and has a slightly larger outer diameter. Forming the closing portion on both sides of the oil drainage passage, and press-fitting and fixing the partition member into the oil passage.
(9) The partition member is formed in a hollow shape, the partition member is installed in the oil passage, and the oil supply passage and the oil discharge passage are formed on both inside and outside of the partition member.
(10) In (9), the oil passage is formed in a circular cross section, the partition member is formed in a cylindrical shape, the partition member is installed concentrically in the oil passage, and the inner side of the partition member The space is the oil supply passage, and the outer space is the oil discharge passage.
(11) In (10), a spiral groove is formed on the inner peripheral surface or outer peripheral surface of the partition member.
(12) In (10), the oil supply passage is formed by a through-hole formed of a large diameter portion extending from the oil supply mechanism side and a small diameter portion extending from the large diameter portion toward the operation portion side, and the small diameter portion of the oil supply passage The front end portion of the partition member is connected to the end portion of the oil supply mechanism, and the inner space of the partition member and the small diameter portion of the oil supply passage are used as the oil supply passage.

  Further, the present invention for achieving the above-mentioned another object is to provide an electric motor comprising an operating portion that forms a working chamber by meshing a fixed scroll and an orbiting scroll in which a spiral wrap is erected on each end plate, and a stator and a rotor. A sealed container that houses the operating portion and the electric motor, a shaft that has an oil supply passage and an oil discharge passage inside, and that transmits the rotational force of the rotor to the operating portion through the rotor of the electric motor, A frame having a main bearing that pivotally supports the shaft on the operating portion side from the electric motor, and an oil supply mechanism that supplies lubricating oil stored in the sealed container to the sliding portion of the shaft through the oil supply passage. In the manufacturing method of the scroll fluid machine provided, the oil passage is formed in the shaft so as to extend in the axial direction, and then inserted into the oil passage, and the oil supply And the oil supply passage through which oil is supplied from the structure is to divide the said oil discharge passage lubricating oil passes through the sliding portion is discharged by lubrication of the shaft.

  According to the scroll fluid machine of the present invention, the oil supply amount can be secured and the reliability can be improved with a simple configuration, the power loss and the oil increase amount of the oil pump can be reduced, the efficiency can be improved, and the oil storage amount can be reduced. Reduction can be achieved.

  According to the manufacturing method of the scroll fluid machine of the present invention, it is possible to improve the reliability by securing the oil supply amount, and to improve the efficiency and reduce the oil storage amount by reducing the power loss and the oil rising amount of the oil pump. It is possible to easily manufacture a scroll fluid machine that can be realized.

  Hereinafter, a plurality of embodiments of the present invention will be described with reference to the drawings. The same reference numerals in the drawings of the respective embodiments indicate the same or equivalent. However, the present invention is not limited to the following embodiments. In addition, unless otherwise specified, the scope of the present invention is not intended to limit the scope of the present invention only to those embodiments, but is merely an illustrative example.

(First embodiment)
A scroll compressor 100 as a scroll fluid machine according to a first embodiment of the present invention will be described with reference to FIGS. 1 to 3.

  First, the entire scroll compressor 100 will be described with reference to FIG. FIG. 1 is a cross-sectional view of a scroll compressor as a scroll fluid machine according to a first embodiment of the present invention.

  The scroll compressor 100 has a structure in which a compression mechanism as an operation mechanism, a drive mechanism, and an oil supply mechanism are accommodated in the sealed container 1.

  The compression mechanism has a fixed scroll 2, a turning scroll 3, and a frame 4 as basic elements. The fixed scroll 2 and the orbiting scroll 3 are engaged with each other to form a compression unit 30 that forms a compression chamber. As an operation mechanism, the compression chamber constitutes an operation chamber, and the compression portion 30 constitutes an operation portion.

  The fixed scroll 2 includes an end plate 2a and a spiral wrap 2b erected on the end plate 2a as basic components. A suction port 2c is formed in the outer peripheral portion of the end plate 2a, and a discharge port 2d is formed in the central portion of the end plate 2a. A suction pipe 16 is connected to the suction port 2c. The discharge port 2d is opened in an upper space that forms a part of the discharge space 17 in the sealed container 1. A discharge pipe 18 that guides the working fluid from the discharge space 17 to the outside of the compressor is provided through the sealed container 1.

  The orbiting scroll 3 includes an end plate 3a, a spiral wrap 3b erected on the end plate 3a, and a boss cylinder 3c erected on the back side of the end plate 3a. A slewing bearing 3d is provided in the boss cylinder 3c. The lower end surface 3e of the boss cylinder 3c is rotatably mounted on the upper surface of the frame 4.

  The frame 4 is fixed to the sealed container 1 by welding or the like. The fixed scroll 2 is fixed to the frame 4 with bolts or the like. The orbiting scroll 3 is disposed between the fixed scroll 2 and the frame 4 so as to be orbitable. The frame 4 forms a back pressure chamber that is an intermediate pressure between the discharge pressure and the suction pressure during operation on the back side of the end plate 3a. The orbiting scroll 3 is pressed against the fixed scroll 2 by the intermediate pressure of the back pressure chamber during operation, and the sealing performance of the compression chamber is enhanced.

  The driving mechanism for driving the orbiting scroll 3 to rotate is an electric motor 40 as an example of a rotation driving means, a shaft 7, an Oldham ring 8 which is a main part of the rotation preventing mechanism of the orbiting scroll 3, and an upper portion of the shaft 7. A swing bearing 3a that engages the main bearing 9 that engages with the shaft 7, an eccentric portion of the shaft 7 so as to be movable in the direction of the rotation axis, and a sub-bearing 11 that engages the lower portion of the shaft 7 with rotation. Is the basic element. The sliding portion of the shaft 7 corresponds to a portion of the shaft 7 with respect to the main bearing 9, the slewing bearing 3a, the auxiliary bearing 11, and the like.

  The electric motor 40 is configured by an induction motor, and includes an annular stator 5 and an annular rotor 6. The stator 5 is fixed to the sealed container 1 by shrink fitting or the like. The rotor 6 is rotatably disposed in the stator 5. On the upper and lower end surfaces of the rotor 6, balance weights 12, which are balanced parts for canceling out the unbalanced force caused by the movement of the orbiting scroll 3 and keeping the compressor vibration low, are installed.

  The electric motor 40 and the compression unit 30 are arranged side by side in the longitudinal direction of the sealed container 1, and are linked by the shaft 7. The frame 4 is disposed between the electric motor 40 and the compression unit 30.

  The shaft 7 is installed through the rotor 6 of the electric motor 40, is a cylindrical member that transmits the rotational force of the rotor 6 to the compression unit 30, and is formed of a casting. The upper portion of the shaft 7 is rotatably supported by the main bearing 9, the intermediate portion of the shaft 7 passes through the center portion of the rotor 6, and the lower portion of the shaft 7 is rotatably supported by the auxiliary bearing 11. The auxiliary bearing 11 is provided to ensure stable rotation of the shaft 7.

  The Oldham ring 8 is installed in the frame 4. One set of two orthogonal key portions formed on the Oldham ring 8 slides on the key groove formed on the frame 4, and the other set slides on the key groove formed on the back side of the orbiting scroll end plate.

  The main bearing 9 is built in the center of the frame 4. The auxiliary bearing 11 is built in the center of the auxiliary bearing member 10. The auxiliary bearing member 10 is disposed in the vicinity of the oil surface on the side opposite to the compression portion of the electric motor 40 and is fixed to the sealed container 1 by welding or the like.

  The oil supply mechanism 14 is composed of an oil supply pump, and is installed at the lower end of the shaft 7. The oil supply mechanism 14 is positioned below the auxiliary bearing 10 and is fixed to the center portion of the auxiliary bearing member 10. The suction port of the oil supply mechanism 14 is immersed in the lubricating oil 15 stored in the lower space in the sealed container 1. The discharge port of the oil supply mechanism 14 communicates with the lower end opening of the oil supply passage 13 of the shaft 7.

  Here, the basic operation of the scroll compressor 100 will be described. The rotating force of the rotor 6 is given by the rotating magnetic field generated by the stator 5, and the shaft 7 fixed to the rotor 6 rotates as the rotor 6 rotates. The orbiting scroll 3 is movably engaged with the eccentric part of the shaft 7 so as to be movable in the direction of the rotation axis, and the rotational movement of the shaft 7 is changed to the orbiting movement of the orbiting scroll 3 by an anti-rotation mechanism such as the Oldham ring 8. Converted. The volume of the compression chamber formed by meshing the fixed scroll 2 and the orbiting scroll 3 decreases as the orbiting scroll 3 orbits. In the compression operation, the working fluid such as the refrigerant is sucked into the compression chamber via the suction pipe 16 and the suction port 2a as the turning scroll 3 turns. The sucked working fluid communicates with the discharge port 2b of the fixed scroll through a compression stroke in the compression chamber, passes through the discharge space 17, and is finally discharged from the discharge pipe 18 to the outside of the compressor.

  Next, the circulation system of the lubricating oil 15 in the scroll compressor 100 will be described with reference to FIGS. 2 is a perspective view of a partition member used in the scroll compressor of FIG. 1, and FIG. 3 is a perspective view of a modification of the partition member of FIG.

  An oil passage 7 a extending in the axial direction is provided inside the shaft 7. The oil passage 7 a has a circular shape that is the same in the longitudinal direction of the shaft 7, and is formed by one hole that penetrates both end surfaces of the shaft 7. With this configuration, the oil passage 7a can be easily drilled in the shaft 70 by a drill or the like.

  By inserting and fixing the partition member 23 in the oil passage 7a provided in the shaft 7 as shown in FIG. 1, the oil passage 7a is connected to the oil supply passage 13 through which the lubricating oil supplied from the oil supply mechanism 14 passes, and the shaft 7 is divided into an oil drain passage 22 through which lubricating oil that has lubricated the sliding portion 7 passes. According to such a configuration, the shaft 7 of the scroll fluid machine that is required to have an outer diameter as thin as possible as compared with a configuration in which the oil supply passage and the oil discharge passage are independently formed inside the shaft with a simple configuration. Even in this case, the flow passage areas of the oil supply passage 13 and the oil discharge passage 22 can be large, and the oil supply passage 13 and the oil discharge passage 22 can be provided close to each other. As a result, the amount of oil supply can be increased, and the centrifugal force applied to the lubricating oil can be reduced to suppress vibration and noise. As a result, the reliability can be improved.

  As shown in FIGS. 1 and 2, the partition member 23 includes a plate-shaped partition portion 23 a that is divided into an oil supply passage 13 and an oil discharge passage 22, and the oil discharge passage 22 communicates with an end surface opening of the oil passage 7 a. It consists of a semi-cylindrical closing part 23 b that closes so as not to be closed, and a semicircular ring part 23 c that forms the inlet part of the oil supply passage 13. The oil supply passage 13 and the oil discharge passage 22 are symmetrically juxtaposed in the same shape with a plate-like partition portion 23a in the center.

  The partition part 23a, the closing part 23b, and the ring part 23c are formed of the same member so as to be easily manufactured. The partition member 23 is substantially the same length as the oil passage 7a and has a slightly larger outer diameter. The oil supply passage 13 and the oil discharge passage 22 can be easily provided inside the shaft 7 by press-fitting and fixing the partition member 23 into the oil passage 7a.

  The shaft 7 is formed with a lateral hole 7 b communicating with the main bearing 9 and a lateral hole 7 c communicating with the auxiliary bearing 11. The axial length of the partition portion 23a is set to be substantially equal to the distance between the horizontal hole 7b and the horizontal hole 7c. The closing part 23b is provided on both sides of the partition part 23a. By inserting and fixing the partition member 23 in the oil supply passage 13, the oil supply passage 13 that opens to the upper and lower end faces of the shaft 7 and a part of the oil supply passage 13 are sealed, and the main bearing 9 and the sub bearing 11 and the oil drainage passage 22 opened to both the bearings. These two passages 13 and 22 are sealed by the partition member 23 and the inner peripheral surface of the shaft 7 so as not to communicate with each other.

  Here, the flow of the lubricating oil 15 will be described. The flow of the lubricating oil 15 during operation of the scroll compressor 100 is indicated by arrows in FIG.

  The lubricating oil 15 stored in the lower space in the sealed container 1 is increased in pressure by the pumping action of the oil supply mechanism 14 accompanying the rotation operation of the shaft 7, and is supplied to the swivel bearing 3 a via the oil supply passage 13 of the shaft 7. The The lubricating oil 15 that lubricates the slewing bearing 3a is sealed by a seal member 19 installed on the frame 4 so that only a small amount of the lubricating oil 15 is supplied to the compression mechanism. Accordingly, it is possible to prevent excessive supply of the lubricating oil 15 to the compression mechanism, to prevent the lubricating oil 15 from flowing out through the compression mechanism, and to supply a large amount of the lubricating oil 15 to the main bearing 9. can do.

  Lubricating oil 15 that has lubricated the main bearing 9 enters the oil drainage passage 22 from the lateral hole 7 b of the shaft 7, and is discharged from the lateral hole 7 c of the shaft 7 to the lower space in the sealed container 1 via the oil drainage passage 22. Is done. The auxiliary bearing 11 is lubricated by a part of the discharged lubricating oil 15, and the auxiliary bearing 11 can be lubricated with a simple configuration, and the reliability can be improved.

  According to the present embodiment, the oil drain passage 22 through which the lubricating oil 15 that lubricated the sliding portion of the shaft 7 passes is provided inside the shaft 7, and therefore lubrication is performed through the outer peripheral portion of the stator 5 using the oil drain pipe. The assembly and insertion of an oil drain pipe is not required compared to those that drain oil, and productivity can be improved, and there is no need to cut out the stator 5 in order to pass the oil drain pipe. Efficiency can be improved.

  Further, according to the present embodiment, the lubricating oil 15 that has lubricated the sliding portion of the shaft 7 through the oil supply passage 13 is discharged to the oil discharge passage 22 provided inside the shaft 7. The total required oil amount of the lubricating oil 15 can be set smaller than that in which the lubricating oil that has branched and lubricated the sliding portion of the shaft 7 is discharged into the compressor space separately from the oil discharge passage. Power loss can be reduced. Since the circulation path of the lubricating oil 15 can be shortened, the amount of oil that needs to be stored in advance in the compressor can be reduced. In particular, since the lubricating oil 15 supplied from the oil supply passage 13 is allowed to flow in series with the slewing bearing 3d and the main bearing 9 and then discharged to the oil discharge passage 22, the total required oil amount of the lubricating oil 15 is markedly increased. The power loss in the oil supply mechanism 14 can be greatly reduced.

  In addition, according to the present embodiment, the lubricating oil 15 that lubricated the sliding portion of the shaft 7 serves as the oil drain passage 22 that flows from the electric motor 40 to the space on the side opposite to the compression portion. Compared to the case where oil is discharged from the electric motor to the space on the compression portion side, the lubricating oil discharged from the oil discharge passage 22 to the space on the non-compression portion side from the electric motor 40 is prevented from being stirred by the electric motor 40. Thus, discharge to the outside of the compressor can be suppressed, and as a result, the amount of oil rising can be reduced.

  In addition, as shown in FIG. 3, the oil supply port to the main bearing 9 or the sub-bearing 11 is made into the main bearing 9 or the sub-bearing 11 by twisting the plate shape in the center part of the partition member 23 coaxially with the central axis at an arbitrary angle. Any angle in the radial direction can be set. Further, by matching the twisting direction with the shaft rotation direction, a centrifugal pump action can be imparted and more lubricating oil 15 can be supplied.

(Second Embodiment)
Next, a second embodiment of the present invention will be described with reference to FIGS. FIG. 5 is a sectional view of a scroll compressor according to the second embodiment of the present invention, and FIG. 5 is an assembly explanatory view of a partition member used in the scroll fluid machine of FIG. The second embodiment is different from the first embodiment in the points described below, and the other points are basically the same as those in the first embodiment, and thus redundant description is omitted.

  In the second embodiment, an oil supply passage 7a and lateral holes 7b and 7c penetrating the upper and lower end faces are provided in advance in the central portion of the shaft 7. The oil supply passage 7 a is connected to the first large diameter portion 7 a 1 and the lateral holes 7 b and 7 c in order to attach the oil supply pipe 21 in order from the oil supply mechanism side, and is divided into the oil supply passage 13 and the oil discharge passage 22. It consists of a diameter portion 7 a 2, a first small diameter portion 7 a 3 on which the pipe-shaped hollow member 20 is mounted, and a second small diameter portion 7 a 4 that forms a part of the oil supply passage 22.

  A hollow member 20 having an outer diameter slightly larger than the inner diameter of the first small diameter portion 7a3 at the shaft central portion of the shaft 7 is inserted into the oil supply passage 7a, and the upper end portion of the hollow member 20 is press-fitted into the first small diameter portion 7a3. Fix it. Next, the upper portion of the oil supply pipe 21 is inserted into the first large-diameter portion 7a1 from below the shaft 7, and the hollow member 20 is sandwiched and fixed. A partition member 23 is constituted by the hollow member 20 and the oil supply pipe 21.

  The shaft 7 configured by the above assembling method is used as the supply passage 13 because the insides of the hollow member 20 and the oil supply pipe 21 communicate with the openings on the upper and lower end surfaces of the shaft 7. Further, the space between the outer wall of the hollow member 20 and the inner wall of the oil passage 7 a of the shaft 7 is used as the oil discharge passage 22. The shaft 7 is provided with lateral holes 7 b and 7 c that open to the main bearing 9 and the auxiliary bearing 11, and these lateral holes 7 b and 7 c form a part of the oil discharge passage 22. The hollow member 20 can be made of a non-metallic material such as heat-resistant plastic because the differential pressure between the outside and the inside thereof is small.

  The lubricating oil 15 during the operation of the scroll compressor flows as shown by arrows in FIG. That is, the lubricating oil 15 stored in the lower space in the sealed container 1 is pressurized by the pumping action of the oil supply mechanism 14 accompanying the rotation operation of the shaft 7, and the hollow member 20 inserted into the shaft 7 and the oil supply pipe 21 are fixed. The oil is supplied to the slewing bearing 3a via an oil supply passage 13 formed inside. The oil that has lubricated the slewing bearing 3a is sealed by the seal member 19 installed in the frame 4 so that only a small amount of the lubricating oil 15 is supplied to the compression mechanism. It is supplied to the bearing 9. The oil that has lubricated the main bearing 9 enters the drain oil passage 22 formed outside the hollow member 20 inserted and fixed in the shaft 7 from the side hole of the shaft 7, and a part of the oil passes through the drain oil passage 22. Is discharged into the lower space in the sealed container 1 while lubricating the auxiliary bearing 11.

  According to the second embodiment, the inside of the shaft 7 can be easily divided into the oil supply passage 13 and the oil discharge passage 22 simply by inserting and fixing the hollow member 20 and the oil supply pipe 21 into the shaft 7. By using the pipe-shaped hollow members 20 and 21 as the member 23 that partitions the oil passage 7a of the shaft 7 into the oil supply passage 13 and the oil discharge passage 22, the oil supply passage 13 and the oil discharge passage 22 can be more reliably partitioned. it can. In addition, since the hollow member 20 whose central axis is substantially coaxial is inserted and fixed in the shaft 7, the eccentricity of the centrifugal force accompanying the rotation of the shaft 7 can be minimized, vibration and noise are suppressed, and high reliability is achieved. Can be secured.

  In the configuration of the second embodiment, if the oil surface of the lubricating oil 15 is secured above the auxiliary bearing 11 and above the lateral hole 7c, the suction port and the discharge port of the oil supply mechanism 14 are reversed. The internal space of the hollow member 20 and the oil supply pipe 21 can be used as an oil discharge passage, and the space formed between the outside of the hollow member 20 and the shaft can be used as an oil supply passage. However, in this case, the productivity of the oil supply mechanism 14 deteriorates and it is necessary to increase the amount of oil stored inside the compressor. Therefore, the internal space of the hollow member 20 is used as an oil supply passage, the outside of the hollow member 20 and the inside of the shaft. It is more preferable to set the space formed in the oil drain passage.

(Third embodiment)
Next, a third embodiment of the present invention will be described with reference to FIGS. FIG. 6 is a sectional view of a scroll fluid machine according to a third embodiment of the present invention, and FIG. 7 is an assembly explanatory view of a partition member used in the scroll fluid machine of FIG. The third embodiment is different from the second embodiment in the following points, and the other points are basically the same as those in the second embodiment, and thus redundant description is omitted.

  The shaft 7 is manufactured in the same shape and size as in the first embodiment. The partition member 23 is manufactured by one pipe-shaped hollow member, and includes a partition portion 23a and a closing portion 23b. The closing part 23b is provided in the upper part and the lower part of the partition member 23, and has an outer diameter slightly larger than the inner diameter of the oil passage 7a. Further, when the outer diameter of the partition portion 23a in the intermediate portion of the partition member 23 is made smaller than the inner diameter of the oil passage 7a of the shaft 7 and the partition member 23 is inserted and fixed in the shaft 7, the outer wall of the partition portion 23a An oil discharge passage 22 is formed between the inner wall of the oil passage 7 a of the shaft 7.

  According to the third embodiment, the oil passage 7a of the shaft 7 can be made a simpler shape, and productivity can be increased by using the partition member 23 in which the hollow member 20 and the oil supply pipe 21 are integrally molded. It can be improved.

  In addition, by processing the spiral groove on the inner peripheral surface or the outer peripheral surface of the hollow member 20 and the partition portion 23a used in the third and fourth embodiments, the centrifugal oil acts on the lubricating oil 15 as the shaft 7 rotates. In combination with the oil supply mechanism 14, more lubricating oil 15 can be efficiently circulated.

It is sectional drawing of the scroll compressor of 1st Embodiment of this invention. It is a perspective view of the partition member used for the scroll compressor of FIG. It is a perspective view of the modification of the partition member of FIG. It is sectional drawing of the scroll compressor of 2nd Embodiment of this invention. It is assembly explanatory drawing of the partition member used for the scroll fluid machine of FIG. It is sectional drawing of the scroll fluid machine of 3rd Embodiment of this invention. It is assembly explanatory drawing of the partition member used for the scroll fluid machine of FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Airtight container, 2 ... Fixed scroll, 2a ... End plate, 2b ... Wrap, 2c ... Suction port, 2d ... Discharge port, 3 ... Revolving scroll, 3a ... End plate, 3b ... Wrap, 3c ... Boss cylinder, 3d ... Slewing bearing, 3e ... bottom surface of boss cylinder, 4 ... frame, 5 ... stator, 6 ... rotor, 7 ... shaft, 7a ... oil passage, 7a1 ... first large diameter portion, 7a2 ... second large diameter portion, 7a3 ... first DESCRIPTION OF SYMBOLS 1 Small diameter part, 7a4 ... 2nd small diameter part, 7b, 7c ... Side hole, 8 ... Oldham ring, 9 ... Main bearing, 10 ... Sub bearing member, 11 ... Sub bearing, 12 ... Balance weight, 13 ... Oil supply path, 14 DESCRIPTION OF SYMBOLS ... Oil supply mechanism, 15 ... Lubricating oil, 16 ... Suction pipe, 17 ... Discharge space, 18 ... Discharge pipe, 19 ... Seal member, 20 ... Hollow member, 21 ... Oil supply pipe, 22 ... Oil discharge passage, 23 ... Partition member, 23a ... Partition part, 23b ... Closure part, 23c ... Re- Grayed section, 30 ... compression section (operating section), 40 ... motor, 100 ... scroll compressor.

Claims (14)

An operation part that forms a working chamber by meshing a fixed scroll and a turning scroll each having a spiral wrap on each end plate;
An electric motor comprising a stator and a rotor;
A sealed container for housing the operating unit and the electric motor;
A shaft that has an oil supply passage and an oil discharge passage inside, is installed through the rotor of the electric motor, and transmits the rotational force of the rotor to the operating portion;
A frame comprising a main bearing that pivotally supports the shaft on the operating part side of the electric motor;
In a scroll fluid machine comprising: an oil supply mechanism that supplies lubricating oil stored in the sealed container to the sliding portion of the shaft through the oil supply passage;
The oil passage provided in the shaft so as to extend in the axial direction is divided by the partition member, the oil supply passage through which the lubricating oil supplied from the oil supply mechanism flows, and the lubricating oil that has lubricated the sliding portion of the shaft. A scroll fluid machine characterized in that it is partitioned into the oil drainage passage that flows from the electric motor to the counteracting portion side.   2. The orbiting scroll according to claim 1, wherein the orbiting scroll includes an orbiting bearing that pivotally supports an eccentric portion of the shaft, and the lubricating oil supplied from the oil supply passage flows in series to the orbiting bearing and the main bearing, and then the oil discharge passage. A scroll fluid machine characterized by being configured to discharge to   3. The oil supply passage according to claim 2, wherein the oil supply passage is provided so as to penetrate in the longitudinal direction of the shaft, and lubricating oil supplied from the oil supply passage to a gap between a front end surface of the shaft and a back surface of the orbiting scroll is supplied to the orbiting bearing and the A scroll fluid machine characterized by having a configuration in which the main bearings are flowed in order and then discharged into the oil discharge passage.   4. The sealing member according to claim 3, wherein a seal member is provided between the orbiting scroll and the frame to restrict a part of the lubricating oil that has lubricated the orbiting bearing so as to branch by a predetermined amount to the operating portion side. Scroll fluid machine.   4. The auxiliary bearing member according to claim 3, further comprising a secondary bearing member that includes a secondary bearing that pivotally supports the shaft on the side opposite to the operating portion from the electric motor, so that part of the lubricating oil discharged to the oil drainage passage flows through the secondary bearing. A scroll fluid machine characterized by comprising   2. The oil passage is formed in a through hole penetrating the shaft, and the oil passage is in communication with a partition portion that partitions the oil passage and the oil passage, and an end face opening of the oil passage. A scroll fluid machine characterized in that the partition member is composed of a closing portion that closes so as not to occur.   The scroll fluid machine according to claim 6, wherein the partition portion and the closing portion are formed of the same member.   The scroll fluid machine according to claim 6, wherein the partition portion and the closing portion are formed as separate members.   The oil passage according to claim 7, wherein the oil passages are all configured in a circular shape with the same cross-section in the longitudinal direction, and the partition member is substantially the same length as the oil passage and has a slightly larger outer diameter, A scroll fluid machine characterized in that closed portions are formed on both sides of the oil drainage passage, and the partition member is press-fitted and fixed to the oil passage.   2. The partition member according to claim 1, wherein the partition member is formed in a hollow shape, the partition member is installed in the oil passage, and the oil supply passage and the oil discharge passage are formed on both inside and outside of the partition member. Scroll fluid machine.   11. The oil passage according to claim 10, wherein the oil passage is formed in a circular shape in cross section, the partition member is formed in a cylindrical shape, the partition member is installed concentrically in the oil passage, and an inner space of the partition member is provided in the oil supply. A scroll fluid machine having a passage and an outer space as the oil discharge passage.   12. The scroll fluid machine according to claim 11, wherein a spiral groove is formed on an inner peripheral surface or an outer peripheral surface of the partition member.   The oil supply passage according to claim 11, wherein the oil supply passage is formed by a through hole including a large diameter portion extending from the oil supply mechanism side and a small diameter portion extending from the large diameter portion toward the operation portion side, and the oil supply mechanism side of the small diameter portion of the oil supply passage A scroll fluid machine, wherein an end portion of the partition member is connected to an end portion, and an inner space of the partition member and a small diameter portion of the oil supply passage are used as the oil supply passage. An operation part that forms a working chamber by meshing a fixed scroll and a revolving scroll each provided with a spiral wrap on each end plate; an electric motor composed of a stator and a rotor; and a sealed container that houses the operation part and the electric motor; A shaft that has an oil supply passage and an oil discharge passage inside, passes through the rotor of the electric motor and transmits the rotational force of the rotor to the operating portion, and a main bearing that supports the shaft on the operating portion side of the electric motor In a method for manufacturing a scroll fluid machine, comprising: a frame comprising: a frame; and an oil supply mechanism that supplies lubricating oil stored in the sealed container to the sliding portion of the shaft through the oil supply passage.
An oil passage is formed in the shaft so as to extend in the axial direction, and then the partition member is inserted into the oil passage, and the oil supply passage through which oil supplied from the oil supply mechanism passes, and the sliding portion of the shaft A method for manufacturing a scroll fluid machine, characterized in that the oil is divided into the oil discharge passage through which the lubricating oil discharged by lubricating the oil passes.

Images