Patent Application
20140064995
The present invention relates to a scroll compression device that magnetizes a rotor by passing electric current through windings of a driving motor supported in a casing.
There has been hitherto known a scroll compression device that has a compression mechanism comprising a fixed scroll and a swing scroll having mutually engageable spiral laps in a hermetically sealed casing and in which the compression mechanism is driven by a driving motor so that the swing scroll makes a circular motion with respect to the fixed scroll without rotating on its own axis, thereby performing compression (see Patent Document 1, for example).
In the scroll compression device, bearings for supporting a driving shaft in a casing are provided at the upper and lower sides of a driving motor. When a rotor is magnetized by passing current through stator windings of the driving motor supported in the casing, it is necessary to rotate the rotor in a magnetization step and in a check step after the magnetization step. However, it is not easy that the rotor is rotated to position and check the rotor under the state that the bearings for supporting the driving shaft in the casing are provided at the upper and lower sides of the driving motor, and thus the workability is low.
The present invention has an object to provide a scroll compression device that can solve the problem of the above prior art and enhance the workability of magnetization of windings.
In order to attain the above object, according to the present invention, a scroll compression device is characterized in that a scroll compression mechanism for compressing refrigerant and a driving shaft that is connected to the scroll compression mechanism through a driving shaft and drives the scroll compression mechanism are accommodated in a casing; the scroll compression mechanism is supported in the casing by a main frame; a rotor of the driving motor is connected to the driving shaft; the driving shaft is supported in the casing by a bearing plate; a pickup is connected to an oil supply path extending in an up-and-down direction in the driving shaft; and a holder extending in a radial direction is provided in the oil supply path at the back side of the pickup.
According to the present invention, with respect to even the scroll compression device in which the bearings for supporting the driving shaft in the casing are provided at the upper and lower sides of the driving motor, the driving shaft can be rotated by using the holder extending in the radial direction in the oil supply path. Therefore, the efficiency of workability of magnetization of windings can be enhanced.
In this construction, the holder may be a pin member penetrating through the oil supply path. Furthermore, a lower balancer may be provided to a lower portion of the rotor of the driving motor, a regulation plate for regulating rotation of the rotor may be provided to the lower surface of the lower balancer, and a plurality of lock groove portions may be provided on the outer periphery of the regulation plate. Still furthermore, the bearing plate may have a plurality of opening portions through which spaces above and below the bearing plate intercommunicate with each other, and the inner dimension of the plurality of lock groove portions of the regulation plate may be set to be larger than the inner dimension of the plurality of opening portions. Still furthermore, the driving motor may be a DC driving motor driven by an inverter.
In order to attain the above object, according to the present invention, a magnetizing method for the scroll compression device described above is characterized by comprising: detaching the pickup; inserting a rotating jig into the oil supply path; and repeating an operation of locking the tip of the rotating jig to the holder, rotating the driving shaft by a predetermined angle and then stopping the driving shaft through operation of the rotating jig, applying a voltage to windings of the driving motor, rotating the driving shaft by a predetermined angle and stopping the driving shaft again, and applying the voltage to thereby magnetize the rotor.
In this construction, before the pickup is secured, a rotating jig may be inserted into the oil supply path, the tip of the rotating jig may be locked to the holder, and an operation of locking the tip of the rotating jig to the holder, rotating the driving shaft by a predetermined angle and then stopping the driving shaft through operation of the rotating jig, applying a voltage to windings of the driving motor, rotating the driving shaft by a predetermined angle and stopping the driving shaft again, and applying the voltage may be repeated to thereby magnetize the rotor, and a rotation regulation jig may be locked to the plurality of lock groove portions provided on the outer periphery of the regulation plate so that rotation of the rotor under the magnetization is regulated by the rotation regulating jig.
According to the present invention, when the rotor of the scroll compressor in which the bearings for supporting the driving shaft in the casing are provided at the upper and lower sides is magnetized by winding magnetization, the driving shaft can be rotated by using the holder extending in the radial direction in the oil supply path before the pickup is connected to the oil supply path extending in the up-and-down direction in the driving shaft. Therefore, the efficiency of workability of magnetization of windings can be enhanced.
An embodiment according to the present invention will be described with reference to the drawings.
In
The casing 3 is configured as a pressure container to have a casing main body 3 as a barrel portion having an axial line extending in the up-and-down direction, a cup-shaped upper cap 7 which is air-tightly welded and integrally joined to the upper end portion of the casing main body 5 and has a convex surface protruding upwards, and a cup-shaped lower cap 9 having a convex surface protruding downwards. The inside of the casing 3 is hollow. A terminal cover 52 is provided to the outer peripheral surface of the casing 3, and a power supply terminal 53 for supplying power to a stator 37 described later is provided in the terminal cover 52.
In the casing 3 are accommodated a scroll compression mechanism 11 for compressing refrigerant and a driving motor 13 disposed below the scroll compression mechanism 11. The scroll compression mechanism 11 and the driving motor 13 are joined to each other through a driving shaft 15 which is disposed so as to extend in the up-and-down direction in the casing 3. A gap space 17 is formed between the scroll compression mechanism 11 and the driving motor 13.
A main frame 21 is accommodated at the inner upper portion of the casing 3, and a radial bearing portion 28 and a boss mount portion 26 are formed at the center of the main frame 21. The radial bearing portion 28 pivotally supports the tip (upper end) side of the driving shaft 15, and is configured to project downwards from the center of one surface (lower side surface) of the main frame 21. The boss mount portion 26 is used to accommodate therein a boss 25C of a swing scroll 25 described later, and formed by concaving the center of the other surface (upper side surface) of the main frame 21 downwards. An eccentric shaft portion 15A is formed at the tip (upper end) of the driving shaft 15. The eccentric shaft portion 15A is provided so that the center thereof is eccentric from the shaft center of the driving shaft 15, and inserted through a slewing bearing in the boss 25C so as to be turnably driven.
The scroll compression mechanism 11 comprises a fixed scroll 23 and a swing scroll 25. The fixed scroll 23 is disposed in close contact with the upper surface of the main frame 21. The main frame 21 is secured to the inner surface of the casing main body 5, and the fixed scroll 23 is fastened and fixed to the main frame 21 by a screw 34. The swing scroll 25 is engaged with the fixed scroll 23, and disposed in a swing space 12 formed between the fixed scroll 23 and the main frame 21. The inside of the casing 3 is partitioned into a high-pressure space 27 below the main frame 21 and a discharge space 29 above the main frame 21. The respective spaces 27 and 29 intercommunicate with each other through vertical grooves 71 which are formed on the outer peripheries of the main frame 21 and the fixed scroll 23 so as to extend vertically.
An intake pipe 31 for introducing the refrigerant in the refrigerant circuit to the scroll compression mechanism 11 air-tightly and fixedly penetrates through the upper cap 7 of the casing 3, and a discharge pipe 33 for discharging the refrigerant in the casing 3 to the outside of the casing 3 air-tightly and fixedly penetrates through the casing main body 5. The intake pipe 31 extends in the up-and-down direction in the discharge space 29, and the inner end portion thereof penetrates through the fixed scroll 23 of the scroll compression mechanism 11 and intercommunicates with the compression chamber 35, whereby the refrigerant is sucked into the compression chamber 35 through the intake pipe 31.
The driving motor (DC driving motor) 13 is a DC (Direct Current) motor which is actuated upon an input from a DC power source, and has an annular stator 37 and a rotor 39 which is freely rotatably configured in the stator 37. The driving motor 13 is operated while the rotation torque thereof is controlled by a PWM (Pulse Width Modulation) inverter which receives a constant input voltage and controls the duty ratio of pulse waves, that is, an output period of the pulse waves and the pulse width of the output pulse waves.
The swing scroll 25 of the scroll compression mechanism 11 is operationally connected to the rotor 39 through the driving shaft 15. The stator 37 comprises a stator core 37A and a stator coil 18. The stator core 37A is formed by laminating thin iron plates and has plural grooves (not shown) therein. The stator coil 18 is formed by winding stator windings of plural phases, and provided to be fitted in the grooves formed in the stator core 37A at the upper and lower sides of the stator core 37A. the stator coil 18 is accommodated in an insulator 19. The stator 18 is connected to the power supply terminal 53 through a conductive wire (not shown).
The rotor 39 is magnetized by ferrite magnet or neodymium. As a method of magnetizing the rotor 39 is known a winding magnetizing method of inserting the rotor 39 in the stator 37 and then passing current through stator windings forming the stator coil 18 of the stator 37 to magnetize the rotor 39, or an externally magnetizing method of magnetizing the rotor 39 by using an external magnetizing device and then inserting the rotor 39 in the stator 37. A holder (pin holder) 58 described later in detail is press-fitted into the driving shaft 15, and used to position the rotor 39 when the winding magnetization of the rotor 39 is performed.
The stator 37 is supported on the inner wall of the casing 3 by an annular spacer ring 38. The spacer ring 38 is fixed to the inner wall surface of the casing 3 by shrinkage fitting, and the stator 37 is fixed to the inner wall surface of the spacer ring 38 by shrinkage fitting. The upper end surface of the spacer ring 38 is provided at a lower position than the upper end surface of the stator 37.
A bearing plate 8 in which the lower end portion of the driving shaft 15 is rotatably fitted and supported is provided below the driving motor 13. As shown in
As shown in
A oil supply path 41 as a part of high-pressure oil supplying means is formed in the driving shaft 15, and the oil supply path 41 extends vertically in the driving shaft 15 and intercommunicates with an oil chamber 43 at the back side of the swing scroll 25. The oil supply path 41 is connected to an oil pickup 45 provided to the lower end of the driving shaft 15. A lateral hole 57 is provided at the back side of the oil pickup 45 so as to extend in the radial direction of the driving shaft 15 and penetrates through the oil supply path 41. The holder 58 described above is press-fitted into the lateral hole 57. The oil pickup 45 is press-fitted into the driving shaft 15 after the rotor 39 is magnetized.
The oil pickup 45 has a suction port 42 provided to the lower end thereof, and a paddle 44 formed above the suction port 42. The lower end of the oil pickup 45 is immersed in lubrication oil pooled in the oil pool 40, and the suction port 42 of the oil supply path 41 is opened in the lubrication oil. When the driving shaft 15 rotates, the lubrication oil pooled in the oil pool 40 enters the oil supply path 41 from the suction port 42 of the oil pickup 45, and is pumped up along the paddle 44 of the oil supply path 41. The thus-pumped lubrication oil is passed through the oil supply path 41, and supplied to the respective sliding portions of the scroll compression mechanism 11 such as the radial bearing portion 28, the slewing bearing 24, etc. Furthermore, the lubrication oil is supplied through the oil supply path 41 to the oil chamber 43 at the back side of the swing scroll 25, and supplied from the oil chamber 43 through an intercommunication path 51 provided to the swing scroll 25 to the compression chamber 35.
The main frame 21 penetrates radially from the boss mount portion 26 through the main frame 21 to form a return oil path 47 opened to the vertical groove 71. Excessive lubrication oil out of the lubrication oil supplied through the oil supply path 41 to the respective sliding portions of the scroll compression mechanism 11 and the compression chamber 35 is passed through the return oil path 47 and returned to the oil pool 40. An oil collector 46 is provided below the return oil path 47, and the oil collector 46 extends to the neighborhood of the upper end of the spacer ring 38. Plural notches 54 are formed on the outer peripheral surface of the stator 37 so as to extend between the upper and lower sides of the stator 37. The lubrication oil returned from the oil supply path 41 through the return oil path 47 and the oil collector 46 is passed through the gap between the notches 54 and the gap between the respective arm portions 8B and returned to the oil pool 40. In the cross-sectional view of
The fixed scroll 23 comprises an end plate 23A and a spiral (involute type) lap 23B formed on the lower surface of the end plate 23A. The swing scroll 25 comprises an end plate 25A and a spiral (involute type) lap 23B formed on the upper surface of the end plate 25A. The lap 23B of the fixed scroll 23 and the lap 25B of the swing scroll 25 are engaged with each other, whereby plural compression chambers 35 are formed between the fixed scroll 23 and the swing scroll 25 by both the laps 23B, 25B.
The swing scroll 25 is supported by the fixed scroll 23 through an Oldham's ring 61, and a cylindrical boss 25C having a bottom is provided to the center portion of the lower surface of the end plate 25A so as to protrude from the center portion. Furthermore, the eccentric shaft portion 15A is provided to the upper end of the driving shaft 15, and the eccentric shaft portion 15A is rotatably fitted in the swing scroll 25.
Furthermore, a counter weight portion (upper balancer) 63 is provided to the driving shaft 15 to be located at the lower side of the main frame 21, and a lower balancer 77 is provided to the lower portion of the rotor 39. The driving shaft 15 keeps dynamic balance with the swing scroll 25, the eccentric shaft portion 15A, etc. by the upper balancer 63 and the lower balancer 77. The driving shaft 15 rotates with keeping the weight balance by the counter weight portion 63 and the lower balancer 73, whereby the swing scroll 25 makes an orbital motion. In connection with the orbital motion of the swing scroll 25, the volume between both the laps 23B and 25B is contracted to the center, whereby the compressor chamber 35 compresses the refrigerant sucked through the suction pipe 31. Furthermore, a regulation plate 55 which is swaged integrally with the rotor 39 and the lower balancer 77 is provided to the lower surface of the lower balancer 77. The regulation plate 55 will be described in detail later, and is used to regulate the rotation of the rotor 39 when the winding magnetization of the rotor 39 is performed.
A cup 48 is fixed to the lower side of the main frame 21 by a bolt 49 so as to surround the periphery of the counterweight portion 63. The cup 48 prevents the lubrication oil leaking from the clearance between the main frame 21 and the driving shaft 15 from scattering to the discharge pipe side due to rotation of the counterweight portion 63.
A discharge hole 73 is provided to the center portion of the fixed scroll 23, and gas refrigerant discharging from the discharge hole 73 passes through a discharge valve 75, discharges to the discharge space 29, and then flows out through the vertical grooves 71 provided on the outer peripheries of the main frame 21 and the fixed scroll 23 to the high-pressure space 27 below the main frame 21. This high-pressure refrigerant is discharged to the outside of the casing 3 through the discharge pipe 33 provided to the casing main body 5.
The driving operation of the scroll compression device 1 will be described.
When the driving motor 13 is actuated, the rotor 39 rotates with respect to the stator 37 and thus the swing scroll 25 of the scroll compression mechanism 11 makes only an orbital motion around the fixed scroll 23 without making autorotation. Accordingly, low-pressure refrigerant is passed through the suction pipe 31 and sucked from the peripheral edge side of the compression chamber 35 into the compression chamber 35. This refrigerant is compressed due to the volumetric change of the compression chamber 35, and this compressed refrigerant is set to a high-pressure state and discharged from the compression chamber 35 through the discharge valve 75 to the discharge space 29, and then flows out through the vertical grooves 71 provided on the respective outer peripheries of the main frame 21 and the fixed scroll 23 to the high-pressure space 27 below the main frame 21. This high-pressure refrigerant is discharged to the outside of the casing 3 through the discharge pipe 33 provided to the casing main body 5. The refrigerant discharged to the outside of the casing 3 is circulated in the refrigerant circuit (not shown), sucked through the suction pipe 31 and compressed again. The circulation of the refrigerant described above is repeated.
The flow of the lubrication oil will be described. The lubrication oil pooled at the inner bottom portion of the lower cap 9 in the casing 3 is sucked up by the oil pickup 45, passed through the oil supply path 41 and supplied to the respective sliding portions of the scroll compression mechanism 11 and the compression chamber 35. The excessive lubrication oil in the respective sliding portions of the scroll compression mechanism 11 and the compression chamber 35 is collected from the return oil path 47 to the oil collector 46, passed through the notches 54 provided on the outer periphery of the stator 37, and then returned to the lower side of the driving motor 13.
Next, a method of magnetizing the scroll compression device 1 will be described.
When the rotor 39 is magnetized, the scroll compression device 1 is disposed to be turned upside down as shown in
When the rotor 39 is magnetized, a rotating jig 10 is first inserted through the vertical hole 22 into the oil supply path 41 formed in the driving shaft 15. A recess portion 10B is formed at the tip 10A of the rotating jig 10, and the recess portion 58 is locked to a holder 58 extending in the radial direction in the oil supply path 41. When the rotating jig 10 is rotated under the state that the recess portion 10B of the rotating jig 10 is locked to the holder 58, the driving shaft 15 is rotated along with the rotation of the rotating jig 10, whereby the rotor 39 is rotated. The driving shaft 15 is rotated by a predetermined angle through the rotating jig 10. According to this construction, after the driving shaft 15 is supported in the casing main body 5 by the bearing plate 8, the rotating jig 10 is locked to the holder 58 formed in the oil supply path 41, whereby the rotor 39 can be rotated.
Subsequently, a rotation regulating jig 76 is inserted into the casing main body 5 through the opening portions 8E of the bearing plate 8 as shown in
The driving shaft 15 is rotated by a predetermined angle and stopped by operating the rotating jig 10, the rotation regulating jig 76 is locked to the lock groove portions 55A of the regulation plate 55, and current is passed through the stator windings constituting the stator coil 18 of the stator 37 of the driving motor 13 to generate magnetic field inside the stator core 37A, whereby the rotor 39 is magnetized. At this time, reaction force which is repulsive to magnetic force occurs in the rotor 39, and the rotor 39 is about to rotate due to this reaction force. However, the rotation of the regulation plate 55 is regulated by the rotation regulating jig 76, so that the rotation of the rotor 39 under magnetization is suppressed. After a voltage is applied to the stator windings of the stator coil 18, the driving shaft 15 is rotated by a predetermined angle and then stopped by the rotation jig 10 again. The rotation regulating jig 76 is locked to the regulation plate 55, and then a voltage is applied while the polarity thereof is inverted from that of the previously applied voltage. This operation is repeated at plural times. The rotor 39 is magnetized with being angularly shifted while varying the phase. The rotation angle of the rotor 39 may be arbitrarily set in accordance with the specification of the driving motor 13.
After the rotor 39 is magnetized, a flux check is executed in such a manner that variation of magnetic flux of the rotor 39 is measured by a flux meter (not shown) while the rotor 39 is rotated by the rotating jig 10 and the magnetization state of the rotor 39 is checked from a waveform representing the variation of the magnetic flux measured by the flux meter. Thereafter, the annular plate 59 provided with the baffle plate 14 is fixed to the bearing plate 8 to cover the opening portions 8E. The oil pickup 45 is press-fitted into the driving shaft 15 to be joined to the oil supply path 41, the lower cap 9 is secured, and the casing main body 5 in which the scroll compression mechanism 11 and the driving motor 13 are supported is returned to a normal position. The upper cap 7 may be configured to cover the upper opening of the casing main body 5 afterwards.
As described above, according to the embodiment to which the present invention is applied, the scroll compression mechanism 11 for compressing refrigerant and the driving motor 13 which is connected to the scroll compression mechanism 11 through the driving shaft 15 to drive the scroll compression mechanism 11 are accommodated in the casing 3, the scroll compression mechanism 11 is supported in the casing 3 by the main frame 21, the rotor 39 of the driving motor 13 is connected to the driving shaft 15, the driving shaft 15 is supported in the casing 3 by the bearing plate 8, the pickup 45 is connected to the oil supply path 41 extending in the up-and-down direction in the driving shaft 15, and the holder 58 extending in the radial direction is provided in the oil supply path 41 at the back side of the pickup 45. Therefore, before the pickup 45 is connected to the oil supply path 41, the driving shaft 15 can be rotated by using the holder 58 extending in the radial direction in the oil supply path 41. Accordingly, with respect to even the scroll compressor in which the bearing plate 8 for supporting the driving shaft 15 in the casing 3 and the main frame 21 are provided at the upper and lower sides of the driving motor 13, the driving shaft 15 and the rotor 39 connected to the driving shaft 15 can be easily rotated by merely locking the rotating jig 10 to the holder 58 and rotating the rotating jig 10, so that the positioning of the rotor 39 under the magnetization and the check after the magnetization can be easily performed. Therefore, the working efficiency of the magnetization of the windings can be improved.
Furthermore, according to the embodiment to which the present invention is applied, the holder 58 is a pin member penetrating through the oil supply path 41. Therefore, the lateral hole 57 is formed in the driving shaft 15, and the holder 58 can be easily secured by press-fitting the holder 58 from this lateral hole 57. Furthermore, the holder 58 is configured to remain in the oil supply path 41 of a product. However, the holder 58 does not hinder flow of lubrication oil which is passed through the oil supply path 41 and pumped up.
Still furthermore, according to the embodiment to which the present invention is applied, the lower balancer 77 is provided to the lower portion of the rotor 39 of the driving motor 13, the regulation plate 55 for regulating the rotation of the rotor 39 is provided to the lower surface of the lower balancer 77, and the plural lock groove portions 55A are provided on the outer periphery of the regulation plate 55. Therefore, the driving shaft 15 rotates with keeping the dynamic balance with the swing scroll 25, the eccentric shaft portion 15A, etc. while keeping the weight balance with the upper balancer 63 by the lower balancer 77, whereby the swing scroll 25 is enabled to make an orbital motion without rotating on its own axis. Furthermore, the rotation regulating jig 76 is locked to the lock groove portions 55A provided to the regulating plate 55 which is provided to the lower surface of the lower balancer 77, and the rotor can be prevented from being rotated by the reaction force to the magnetic force, so that the working efficiency of the magnetization of windings can be enhanced.
Still furthermore, according to the embodiment to which the present invention is applied, the bearing plate 8 has the plural opening portions 8E through which the upper and lower spaces intercommunicate with each other, and the inner dimension S1 of the plural lock groove portions 55A of the regulation plate 55 is set to be larger than the inner dimension S2 of the plural opening portions 8E. Therefore, the rotation regulating jig 76 can be locked to the lock groove portions 55A by inserting the rotation regulating jig 76 into the casing 3 through the opening portions 8E, and the rotation of the rotor 39 under magnetization can be easily rotated. Accordingly, the working efficiency of the magnetization of windings can be enhanced.
Still furthermore, according to the embodiment to which the present invention is applied, the driving motor 13 is the DC driving motor which is driven to be controlled in rotation torque by the PWM inverter. Therefore, the driving motor 13 can be miniaturized by using a DC motor having a high output efficiency. Furthermore, occurrence of needless heat caused by increase/decrease of the voltage of the driving motor 13 can be prevented by driving the driving motor 13 with the inverter, whereby the operation efficiency can be enhanced.
Still furthermore, according to the embodiment to which the present invention is applied, the pickup 4 is detached, the rotating jig 10 is inserted in the oil supply path 41, and the operation of rotating the driving shaft 15 by a predetermined angle and then stopping through the operation of the rotating jig 10, applying the voltage to the windings of the driving shaft 13, rotating the driving shaft 15 by a predetermined angle and then stopping the driving shaft 15 again, and applying the voltage is repeated to magnetize the rotor. Therefore, even in the scroll compressor in which the bearing plate 8 for supporting the driving shaft 15 in the casing 3 and the main frame 21 are provided at the upper and lower sides of the driving motor 13, the driving shaft 15 and the rotor 39 connected to the driving shaft 15 can be easily rotated by merely locking the rotating jig 10 to the holder 58 and rotating the rotating jig 10, so that the positioning under the magnetization of the rotor 39 and the check after the magnetization can be easily performed. Furthermore, the magnetization of forming plural poles on the rotor 39 can be easily performed.
Still furthermore, according to the embodiment to which the present invention is applied, the rotating jig 10 is inserted in the oil supply path 41, the tip 10A of the rotating jig 10 is locked to the holder 58, and the operation of rotating the driving shaft 15 by a predetermined angle and then stopping the driving shaft 15 through the operation of the rotating jig 10, applying the voltage to the windings of the driving motor 13, rotating the driving shaft 15 by a predetermined angle and then stopping the driving shaft again, and applying the voltage is repeated to magnetize the rotor 39 before the pickup 45 is secured. In addition, the rotation regulating jig 76 is locked to the plural lock groove portions 55A provided on the outer periphery of the regulation plate 55, and the rotation of the rotor 39 under the magnetization is regulated by the rotation regulating jig 76. Therefore, the rotation regulating jig 76 is locked to the lock groove portions 55A provided to the regulation plate 55, whereby the rotor can be prevented from being rotated with the reaction force to the magnetic force under the magnetization of the rotor 39, and the working efficiency of the magnetization of the windings can be enhanced.
| Number | Date | Country | Kind |
|---|---|---|---|
| 2011-065607 | Mar 2011 | JP | national |
| 2011-066920 | Mar 2011 | JP | national |
| 2011-066921 | Mar 2011 | JP | national |
| 2011-067051 | Mar 2011 | JP | national |
| Filing Document | Filing Date | Country | Kind | 371c Date |
|---|---|---|---|---|
| PCT/JP2011/079465 | 12/20/2011 | WO | 00 | 10/16/2013 |
