JP2007192195A - Scroll compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent occurrence of malfunction in a sliding part between a fixed scroll and a movable scroll and improve the durability of a compressor, by appropriately supplying oil to the sliding part between the fixed scroll and the movable scroll and appropriately retaining oil in the sliding part even in compressor operation with small amounts of refrigerant gas and oil. <P>SOLUTION: This scroll compressor has a compressing mechanism provided with the fixed scroll and the movable scroll. An oil supplying passage which connects between the lower and upper parts of the compressing mechanism and supplies oil introduced from an oil sump part in the lower part of the compressing mechanism to the upper part of the compressing mechanism is provided in the fixed scroll. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a scroll compressor, and more particularly, to a scroll compressor that can lubricate a sliding portion more appropriately.

  A scroll-type compressor having a compression mechanism having a fixed scroll and a movable scroll is well known, and a scroll-type hybrid in which a first compression mechanism and a second compression mechanism that are driven by different drive sources are integrated. Compressors are also known. In such a scroll compressor, there is a possibility that the following problems relating to lubrication between the fixed scroll and the movable scroll may occur.

  For example, regarding a hybrid compressor, a conventional hybrid compressor is configured, for example, as shown in FIGS. 1 and 2 (Patent Document 1, etc.). The hybrid compressor 1 shown in FIG. 1 is a scroll type compressor, and includes a first compression mechanism 2 and a second compression mechanism 3. The first compression mechanism 2 includes a fixed scroll 10, a movable scroll 11 that engages with the fixed scroll 10 to form a plurality of pairs of working spaces (fluid pockets) 12, and engages with the movable scroll 11 to make orbiting the movable scroll 11. The driving force transmission between the driving shaft 13 and the pulley 14 and the driving shaft 13 to which the driving force from the vehicle driving motor (not shown) as an external driving source is transmitted via a belt is turned on / off. An electromagnetic clutch 15, a ball coupling 16 that prevents the movable scroll 11 from rotating, and a suction port 18 formed in the casing 17 are provided. The compressed gas (for example, refrigerant gas) sucked from the suction port 18 through the suction passage 19 into the suction chamber 20 is taken into the working space 12, and the working space 12 decreases in volume to the center of the fixed scroll 10. By moving toward, the refrigerant gas in the working space 12 is compressed. A discharge hole 21 is formed in the central portion of the fixed scroll 10, and the compressed refrigerant gas passes through a discharge passage 23 including the discharge hole 21 and the discharge passage 22, and as shown in FIG. 3 is discharged to the high pressure side of the external refrigerant circuit through the discharge chamber 26 via the discharge valve 24 configured in common with the discharge valve 3 and the discharge valve retainer 25 that regulates the opening degree of the discharge valve 24.

  On the other hand, the second compression mechanism 3 includes a fixed scroll 30, a movable scroll 31 that meshes with the fixed scroll 30 to form a plurality of working spaces (fluid pockets) 32, and engages with the movable scroll 31 to move the movable scroll 31. A drive shaft 33 that rotates is provided, and a ball coupling 34 that prevents the movable scroll 31 from rotating. An electric motor 35 is built in to drive the drive shaft 33 of the second compression mechanism 3. The electric motor 35 is composed of, for example, a three-phase AC electric motor. The electric motor 35 includes a rotor 36 fixed to the drive shaft 33 and a stator (stator) 37 having a motor coil portion. The stator 37 is attached to the stator housing 38 or the compressor housing. The whole of the electric motor 35 is housed in the stator housing 38. Electric power is supplied to the electric motor 35 via the power supply unit 50. In the second compression mechanism 3, the compressed gas (for example, refrigerant gas) sucked from the suction port 18 into the suction chamber 20 of the first compression mechanism 2 passes through the communication path 39 and the suction chamber of the second compression mechanism 3. The gas sucked into the portion 40 and the electric motor 35 and sucked into the suction chamber 40 is taken into the working space 32, and the working space 32 is moved toward the center of the fixed scroll 30 while reducing the volume. The refrigerant gas in the working space 32 is compressed. A discharge hole 41 is formed in the central portion of the fixed scroll 30, and the compressed refrigerant gas passes through a discharge path 43 including the discharge hole 41 and the discharge passage 42, and as shown in FIG. 2 is discharged to the high pressure side of the external refrigerant circuit through the discharge chamber 26 via the discharge valve 24 configured in common with the discharge valve 24 and the discharge valve retainer 25 that regulates the opening degree of the discharge valve 24.

  The fixed scroll 10 of the first compression mechanism 2 and the fixed scroll 30 of the second compression mechanism 3 are arranged back to back, and both the fixed scrolls 10 and 30 are formed as an integrated fixed scroll member 44. Yes. In this example, a communication passage / gas suction passage 39 is formed in the fixed scroll member 44 (FIG. 2).

  When only the first compression mechanism 2 of the hybrid compressor 1 is operated, no electric power is supplied to the electric motor 35 that drives the second compression mechanism 3, and the electric motor 35 does not rotate. Accordingly, the second compression mechanism 3 does not operate. When the hybrid compressor 1 is driven only by the electric motor 35, the electric motor 35 is turned on and rotates, and the rotation of the electric motor 35 is transmitted to the drive shaft 33 of the second compression mechanism 3. The movable scroll 31 is driven to turn. At this time, the electromagnetic clutch 15 of the first compression mechanism 2 is not energized, and the rotation of the vehicle prime mover as the first drive source is not transmitted to the first compression mechanism 2. Accordingly, the first compression mechanism 2 does not operate. When both the compression mechanisms 2 and 3 are driven simultaneously, the driving force from the vehicle prime mover is transmitted to the movable scroll 11 of the first compression mechanism 2 and the electric motor 35 is turned on so that the driving force is the first. 2 is transmitted to the movable scroll 31 of the compression mechanism 3.

In the hybrid compressor 1 configured as described above, in the sliding portion between the fixed scroll and the movable scroll, particularly in the sliding portion between the fixed scroll 10 and the movable scroll 11 on the first compression mechanism 2 side, it is more appropriate. Lubrication may be desired. For example, when refrigerant gas and oil (lubricating oil) escape from the refrigeration circuit and become less than the specified amount of refrigerant gas and oil, for example, when dehumidification is required on the vehicle interior side, dehumidified air The compressor may be operated due to pre-cooling. When the compressor is operated, both the refrigerant gas and oil in the refrigeration circuit circulate in the refrigeration circuit, and the oil circulates in the refrigeration circuit in the form of liquid or mist. May decrease significantly or only circulate intermittently. The behavior of oil in the compressor refrigerant passage depends on the flow of the refrigerant gas, and the sliding portion between the fixed scroll and the movable scroll is lubricated by the oil in the refrigerant gas sucked. That is, lubrication is performed by holding an oil film of oil in the sliding portion gap, but at a high rotation speed, the amount of refrigerant gas and oil sucked per rotation also decreases, and as a result, the oil film in the sliding portion gap decreases. There is a possibility of poor lubrication. In addition, when a poor lubrication occurs, sliding heat is generated at the sliding portion between the fixed scroll and the movable scroll, which accelerates the decrease in the viscosity of the oil film due to the sliding heat and the further decrease in the oil film. If poor lubrication occurs, there is a possibility that the surface roughness will be deteriorated due to worst-case seizure or galling, especially on the first compression mechanism 2 side in the high rotation range. In such a state, there is a risk of poor intake of refrigerant gas and oil and compression leakage in the compression section, which may reduce the cooling performance of the vehicle or make the compressor inoperable.
JP 2003-161257 A

  Accordingly, an object of the present invention is to provide a sliding portion between a fixed scroll and a movable scroll even in a compressor operation under a situation where refrigerant gas and oil escape from the refrigeration circuit of the vehicle to the outside and the prescribed refrigerant gas amount and oil amount are small. The oil can be properly supplied to the sliding portion, and the sliding portion can be appropriately held to prevent the occurrence of trouble in the sliding portion between the fixed scroll and the movable scroll, thereby improving the durability of the compressor. .

  In order to solve the above-mentioned problems, a scroll compressor according to the present invention is a scroll compressor having a compression mechanism having a fixed scroll and a movable scroll, and includes a lower part and an upper part of the compression mechanism in the fixed scroll. It is possible to communicate with each other, and an oil supply path for supplying oil introduced from an oil reservoir in the lower part of the compression mechanism to the upper part of the compression mechanism is provided.

  In this scroll type compressor, the discharge path for discharging the gas compressed by the compression mechanism communicates with the oil supply path, and the oil introduced from the oil reservoir to the oil supply path is discharged with a discharge gas pressure. It is preferable to provide a communication path to the discharge path that can be used and supplied to the upper part of the compression mechanism. For example, the communication passage can be connected to a bent portion between a discharge hole for discharging compressed gas from the compression mechanism and a discharge passage to the discharge chamber.

  Further, an upper side opening / closing means capable of opening and closing the oil supply path and controlling the supply of oil to the upper part of the compression mechanism may be provided on the upper side of the oil supply path. As the upper side opening / closing means, for example, means provided with an electromagnetic valve can be adopted.

  Further, a lower side opening / closing means capable of opening and closing the oil supply path and controlling the introduction of oil from the oil reservoir can be provided on the lower side of the oil supply path. As the lower side opening / closing means, for example, the lower side opening / closing means can be constituted by having a seal body for opening and closing the oil supply passage and means for adjusting the seal pressure of the seal body.

  Further, in the scroll compressor according to the present invention, a structure in which a groove capable of holding oil is formed on a sliding surface with the fixed scroll at the tip of the spiral body of the movable scroll, or the oil A dimple-like depression that can be held may be formed.

  Such a scroll compressor according to the present invention can be applied to any scroll compressor, and the first compression mechanism and the second drive source in which the first movable scroll is driven only by the first drive source. The present invention can also be applied to a hybrid compressor in which a second compression mechanism in which the second movable scroll is driven is integrated.

  As the hybrid compressor, for example, the first drive source is an external drive source (for example, an engine or an electric motor for vehicle travel), and the second drive source is an electric motor built in the compressor. Can be used. Further, it is preferable that the oil introduced into the oil supply path from the oil reservoir is supplied to the upper portion of the first compression mechanism (that is, the first compression mechanism driven by an external drive source). .

  In addition, the fixed scroll of the first compression mechanism and the fixed scroll of the second compression mechanism are integrally configured back to back, and the oil supply path is provided in the integral fixed scroll. .

  Such a scroll compressor according to the present invention is particularly suitable for being provided in a refrigeration circuit of a vehicle air conditioner.

  In such a scroll compressor according to the present invention, the oil in the oil reservoir in the lower part of the compression mechanism is appropriately supplied to the upper part of the compression mechanism through the oil supply path, and even if the oil circulation amount is small, It is effectively utilized for lubrication throughout the compression mechanism. In particular, if the oil supply path is connected to a discharge path that discharges the gas compressed by the compression mechanism, the oil from the oil reservoir is efficiently supplied to the upper part of the compression mechanism using the kinetic energy of the discharge gas. Can do. By supplying oil to the upper part of the compression mechanism, the sliding portion between the fixed scroll and the movable scroll can be sufficiently lubricated. Particularly, in a hybrid compressor, sliding between the fixed scroll and the movable scroll of the first compression mechanism by supplying oil to the upper side of the first compression mechanism driven by an external drive source, which is prone to lack of lubrication. The part becomes sufficiently lubricated.

  As described above, according to the scroll compressor according to the present invention, the oil in the oil reservoir portion is also turned to the upper side of the compression mechanism so that the compression mechanism can be efficiently lubricated as a whole. The sliding part between the scrolls can be sufficiently lubricated, the required oil film is maintained on the sliding part, and the occurrence of problems such as seizure and galling due to insufficient lubrication is improved, and the durability of the compressor is improved. Can be made.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
As described above, the scroll compressor according to the present invention can be applied to any scroll compressor, and in particular, the first compression mechanism in which the first movable scroll is driven only by the first drive source. The present invention is suitable for application to a hybrid compressor in which a second compression mechanism in which the second movable scroll is driven only by the second drive source is integrated. The structure of the hybrid compressor to which the present invention can be applied is as described with reference to FIGS. 1 and 2, for example. Below, the example which applied this invention to this hybrid compressor 1 is demonstrated.

  FIG. 3 shows the structure around the oil supply path of the scroll compressor according to one embodiment of the present invention. In the fixed scroll member 44 shown in FIG. 1, the lower part of the compression mechanism and the upper part (particularly, the upper part of the first compression mechanism 2) can be communicated, and the oil introduced from the oil reservoir in the lower part of the compression mechanism is compressed. An oil supply path 61 for supplying the upper part of the mechanism is provided. The oil supply path 61 is connected to a communication path 62 to the discharge path 23 that can supply oil to the upper portion of the compression mechanism using the discharge gas pressure. The lower part of the oil supply path 61 is configured as an oil introduction path 63 that can communicate with both the oil reservoir part at the lower part of the first compression mechanism 2 and the oil reservoir part at the lower part of the second compression mechanism 3. The communication path 62 is connected to the oil introduction path 63. In this embodiment, the communication passage 62 is connected to a bent portion between the discharge hole 21 and the discharge passage 22, and the compressed discharge gas can be supplied to the oil introduction passage 63 from this portion. ing. Therefore, the oil introduced into the oil introduction passage 63 can be supplied by being pushed out to the upper portion of the first compression mechanism 2 through the oil supply passage 61 using the pressure of the discharge gas introduced through the communication passage 62 of the discharge gas. It has become.

  As shown in FIGS. 4 and 5, an oil outlet path 65 that can communicate with the suction portion 64 of the fixed scroll 10 of the first compression mechanism 2 is provided on the upper side of the oil supply path 61. The oil outlet path 65 is provided with an electromagnetic valve 66 as an upper side opening / closing means capable of controlling the supply of oil to the suction part 64. The electromagnetic valve 66 includes a ball-shaped seal body 67, a spring 68 that urges the seal body 67 in the opening direction, and an electromagnetic coil 69 that can urge the seal body 67 in the closing direction via the magnetic component circuit 70 when energized. The oil supply path 61 can control the supply of oil sent to the suction portion 64 through the passage 71 in the electromagnetic valve 66 (control of supply and blocking of the supply).

  On both sides of the oil introduction path 63 on the lower side of the oil supply path 61, that is, on both sides of the side opening to the first compression mechanism 2 side and the side opening to the second compression mechanism 3 side, the first Lower side opening / closing means 72 capable of controlling the introduction and shutoff of oil from the oil reservoir at the lower part of the compression mechanism 2 and the oil reservoir at the lower part of the second compression mechanism 3 is provided. In this embodiment, the lower side opening / closing means 72 is provided with a ball-like seal body 74 capable of introducing and shutting off oil from the oil reservoir 73, as shown in FIG. It is composed of a spring 75 that is energized. By adjusting the seal pressure of the seal body 74 with the spring 75, the oil from the oil reservoir 73 can be introduced and the introduction shut-off can be controlled. More specifically, for example, by changing the spring load and the diameter of each communicating portion of the seal portion of the seal body, it is possible to adjust the seal pressure by the contact point of the seal body and the seal surface with the movement start point of the seal body. is there. Once the oil is introduced into the oil introduction path 63 and then the discharge gas is supplied to the oil introduction path 63 as described above, the seal body 74 is closed by the discharge gas and the introduced oil is It can be sent to the upper side through the oil supply passage 61 by the discharge gas pressure. However, in order to actually send the oil to the upper side of the oil supply path 61, it is necessary to open the electromagnetic valve 66 described above. Therefore, in the end, the supply of oil to the upper side of the first compression mechanism 2 is controlled by the opening / closing control of the electromagnetic valve 66 arranged at the upper part. With such a configuration, the oil from the oil reservoir is introduced into the oil introduction path 63, the introduced oil is sent to the upper side of the first compression mechanism 2 through the oil supply path 61, and the sent oil is sent A one-way oil supply path for supplying the suction portion on the upper side of the first compression mechanism 2 is configured.

  Furthermore, in this embodiment, as shown in FIG. 7, the sliding surface 82 of the compression mechanism, particularly the fixed scroll 10 at the tip of the spiral body 81 of the movable scroll 11 of the first compression mechanism 2 is placed on the sliding surface 82. A groove 83 extending in a spiral shape is formed along the moving surface 82, and a chip seal 84 is fitted in the groove 83. Of this groove 83, the outer portion of the fitting portion of the chip seal 84 can be formed as an oil holding groove 85 as shown in FIG. The groove shape is not particularly limited. For example, it can be formed into a plurality of grooves 86 as shown in FIG. 9 or can be formed into a dimple-like depression 87 as shown in FIG. 10 in addition to the groove shape. It is. In any configuration, oil can be held on the sliding surface 82 at the tip of the spiral body 81 of the movable scroll 11, and the sliding portion between the fixed scroll 10 and the movable scroll 11 is supplied via the oil supply path 61. It can be properly lubricated with oil.

  In this way, the oil in the oil reservoir at the lower part of the compression mechanism is turned to the upper part of the compression mechanism so that the oil is spread throughout the entire compression mechanism, so that the sliding portion between the fixed scroll 10 and the movable scroll 11 is insufficiently lubricated. Occurrence is prevented, the occurrence of problems associated with insufficient lubrication is prevented, and the durability of the compressor is improved.

  The present invention can be applied to any scroll type compressor, and is particularly suitable for a hybrid compressor. Moreover, it is particularly suitable for a scroll type compressor used in a vehicle air conditioner.

It is a longitudinal cross-sectional view which shows one Example of the hybrid compressor used as the application object of this invention. It is a longitudinal cross-sectional view which follows the II-II line of the compressor of FIG. It is a schematic longitudinal cross-sectional view around the fixed scroll which concerns on one embodiment of this invention at the time of applying this invention to the compressor of FIG. It is a schematic longitudinal cross-sectional view around the upper side opening / closing means part in the structure of FIG. It is a schematic sectional drawing of the upper side opening / closing means in the structure of FIG. It is a schematic sectional drawing of the lower side opening / closing means in the structure of FIG. It is a schematic partial top view which shows the front-end | tip part structure of the spiral body of a movable scroll. FIG. 8 is a schematic partial cross-sectional view of a spiral body taken along lines AA and BB in FIG. 7. It is a general | schematic fragmentary sectional view of the spiral which shows the example of another groove shape in the front-end | tip part of the spiral of a movable scroll. It is a schematic fragmentary sectional view of the spiral body which shows the example of the dimple-like hollow in the front-end | tip part of the spiral body of a movable scroll.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hybrid compressor 2 1st compression mechanism 3 2nd compression mechanism 10 Fixed scroll 11 Movable scroll 13 Drive shaft 14 Pulley 15 Electromagnetic clutch 16 Ball coupling 18 Suction port 19 Suction passage 20 Suction chamber 21 Discharge hole 22 Discharge passage 23 Discharge passage 24 discharge valve 25 discharge valve retainer 26 discharge chamber 30 fixed scroll 31 movable scroll 33 drive shaft 34 ball coupling 35 electric motor 36 rotor 37 motor coil section (stator)
38 Stator housing 39 Communication passage / gas suction passage 40 Suction chamber 41 Discharge hole 42 Discharge passage 43 Discharge passage 44 Fixed scroll member 50 Power supply portion 61 Oil supply passage 62 Communication passage to discharge passage 63 Oil introduction passage 64 Fixed scroll suction portion 65 Oil lead-out path 66 Solenoid valve 67 as upper side opening / closing means Seal body 68 Spring 69 Electromagnetic coil 70 Magnetic component circuit 71 Passage 72 in electromagnetic valve Lower side opening / closing means 73 Oil reservoir 74 Seal body 75 Spring 81 Swirling of movable scroll Body 82 Sliding surface with fixed scroll 83 Groove 84 Chip seal 85, 86 Oil retaining groove 87 Dimple-like depression

Claims (13)

  A scroll type compressor having a compression mechanism having a fixed scroll and a movable scroll, wherein the lower part and the upper part of the compression mechanism can communicate with each other in the fixed scroll, and the oil introduced from the oil reservoir in the lower part of the compression mechanism A scroll compressor characterized in that an oil supply passage is provided for supplying the oil to the upper part of the compression mechanism.   The oil supply passage is communicated with a discharge passage for discharging the gas compressed by the compression mechanism, and oil introduced from the oil reservoir to the oil supply passage is discharged to the upper portion of the compression mechanism using a discharge gas pressure. The scroll compressor according to claim 1, wherein a communication passage to the discharge passage is provided.   The scroll according to claim 1 or 2, wherein an upper side opening / closing means capable of opening and closing the oil supply path and controlling supply of oil to the upper part of the compression mechanism is provided on an upper side of the oil supply path. Mold compressor.   4. The scroll compressor according to claim 3, wherein the upper side opening / closing means comprises means having an electromagnetic valve.   5. The lower side opening / closing means capable of opening and closing the oil supply path and controlling the introduction of oil from the oil reservoir is provided on the lower side of the oil supply path. The scroll compressor described.   The scroll compressor according to claim 5, wherein the lower side opening / closing means includes a seal body that opens and closes an oil supply path and a means capable of adjusting a seal pressure of the seal body.   The scroll compressor according to any one of claims 1 to 6, wherein a groove capable of holding oil is formed on a sliding surface of the spiral scroll of the movable scroll with the fixed scroll.   The scroll type compressor according to any one of claims 1 to 6, wherein a dimple-like depression capable of holding oil is formed on a sliding surface of the spiral scroll of the movable scroll with the fixed scroll. .   A hybrid in which a first compression mechanism in which the first movable scroll is driven only by the first drive source and a second compression mechanism in which the second movable scroll is driven only by the second drive source are integrated. The scroll type compressor according to any one of claims 1 to 8, comprising a compressor.   The scroll compressor according to claim 9, wherein the first drive source is an external drive source, and the second drive source is an electric motor with a built-in second drive source.   The scroll compressor according to claim 9 or 10, wherein oil introduced into the oil supply path from the oil reservoir is supplied to an upper portion of the first compression mechanism.   The fixed scroll of the first compression mechanism and the fixed scroll of the second compression mechanism are integrally configured back to back, and the oil supply path is provided in the integral fixed scroll. The scroll type compressor as described in crab.   The scroll compressor according to any one of claims 1 to 12, wherein the scroll compressor is provided in a refrigeration circuit of a vehicle air conditioner.

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