JP5841865B2 - Scroll type fluid machine - Google Patents

Description

  The present invention relates to a scroll type fluid machine.

  As background arts in this technical field, there are Patent Documents 1 and 2.

  Patent Document 1 describes a scroll type fluid machine in which an in-axis passage portion is provided in a shaft of a turning shaft, a vent hole is provided in a rotating shaft (drive shaft), and cooling air is circulated.

  Patent Document 2 describes a scroll compressor in which a ventilation hole for allowing cooling gas generated by a fan to pass is provided in a casing.

JP 2001-123974 A JP-A-1-267382

  In the scroll type fluid machine, since the reliability cannot be improved when the bearing temperature rises due to the compression heat of the fluid and the heat generation of the bearing, it is important to efficiently reduce the bearing temperature.

  In Patent Document 1, in order to reduce the bearing temperature of the drive shaft, a vent hole is provided in the drive shaft, and drilling through the center of the drive shaft is required. This process requires a distance in the axial direction of the drive shaft, and the workability and productivity cannot be improved.

  In Patent Document 2, since the cooling air after cooling the scroll that becomes high temperature is supplied to the drive shaft by the compression heat, the bearing temperature cannot be efficiently reduced by cooling the drive shaft.

  In view of the above-described problems, the present invention provides a scroll fluid machine in which the drive shaft is efficiently cooled with cooling air, thereby reducing the bearing temperature without reducing workability and productivity and improving the reliability. The purpose is to do.

In order to solve the above problems, the present invention is provided with a fixed scroll provided with a spiral wrap portion and a spiral wrap portion forming a plurality of compression chambers between the fixed scroll wrap portion. The orbiting scroll has a drive shaft that orbits the orbiting scroll by rotating, and a housing that covers the drive shaft. The space in which the housing is arranged, the fixed scroll, and the orbiting scroll are arranged. A casing that partitions the space, a cooling fan provided on the drive shaft, and a duct that distributes the cooling air generated by the cooling fan to the fixed scroll and the orbiting scroll, and supplies the cooling air to the drive shaft the scroll fluid machine and providing a vent hole to the cylindrical portion side covering the drive shaft of the housing Subjected to.

  According to the present invention, it is possible to provide a scroll type fluid machine in which the drive shaft is efficiently cooled by cooling air, thereby reducing the bearing temperature without reducing workability and productivity and improving the reliability. it can.

It is sectional drawing of the scroll type fluid machine in Example 1 of this invention. It is a flowchart of the cooling wind of the scroll type fluid machine in Example 1 of this invention. It is a flowchart of the cooling wind of the conventional scroll type fluid machine. It is a flowchart of the cooling air of the scroll type fluid machine in Example 2 of this invention. It is a flowchart of the cooling air of the scroll type fluid machine in Example 3 of this invention. It is a flowchart of the cooling wind of the scroll type fluid machine in the modification of Example 3 of this invention. It is a flowchart of the cooling air of the scroll type fluid machine in Example 4 of this invention. It is a flowchart of the cooling air of the scroll type fluid machine in a modification in Example 4 of this invention. It is a flowchart of the cooling air of the scroll type fluid machine in a modification in Example 4 of this invention.

  Hereinafter, a scroll type air compressor as an example of a scroll type fluid machine according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

  1 and 2 show Embodiment 1 of the present invention. A casing 1 of the scroll type air compressor has a housing 1A formed in a cylindrical shape. The housing 1A covers the drive shaft 15 that is rotatably supported by the bearing 27 and the bearing 28 therein. The casing 1 partitions the space in which the fixed scroll 2 and the orbiting scroll 8 are arranged from the space in which the housing 1A is arranged.

  As shown in FIG. 1, the fixed scroll 2 provided on the opening side of the casing 1 has an end plate 3 formed in a substantially disc shape with an axis OO as a center, and a tooth bottom surface serving as a surface of the end plate 3. A spiral wrap portion 4 erected in the axial direction, a cylindrical outer peripheral wall portion 5 surrounding the wrap portion 4 and provided on the outer diameter side of the end plate 3, and a rear surface of the end plate 3. The plurality of cooling fins 6 are generally configured.

  Here, the wrap portion 4 is wound, for example, in a spiral shape of about 3 turns from the inner diameter side to the outer diameter side when the outermost diameter end is the winding start end and the outermost diameter end is the winding end end, for example. Has been. The tooth tip surface of the wrap portion 4 is separated from the tooth bottom surface of the end plate 9 of the orbiting scroll 8 as a counterpart by a certain axial dimension.

  Further, a seal groove 4A is provided on the tooth tip surface of the wrap portion 4 along the winding direction of the wrap portion 4, and the seal groove 4A serves as a seal member that is in sliding contact with the end plate 9 of the orbiting scroll 8. A tip seal 7 is provided.

  The orbiting scroll 8 provided in the casing 1 so as to be orbitable is erected on a substantially disc-shaped end plate 9 disposed to face the end plate 3 of the fixed scroll 2 and a tooth bottom surface that becomes the surface of the end plate 9. The spiral wrap portion 10, a plurality of cooling fins 11 protruding from the back surface of the end plate 9, and a back plate 12 positioned and fixed on the front end side of the cooling fins 11 are roughly configured.

  Here, the wrap portion 10 has, for example, a spiral shape of about 3 turns, substantially the same as the wrap portion 4 of the fixed scroll 2. The tooth tip surface of the wrap portion 10 is separated from the tooth bottom surface of the end plate 3 of the fixed scroll 2 which is the counterpart by a certain axial dimension. Further, a seal groove 10A is provided on the tooth tip surface of the wrap part 10 along the winding direction of the wrap part 10, and the seal groove 10A serves as a seal member that is in sliding contact with the end plate 3 of the fixed scroll 2. A tip seal 13 is provided.

  A cylindrical boss portion 14 is formed on the center side of the back plate 12. The crank portion 15 </ b> A of the drive shaft 15 is rotatably supported in the cylindrical boss portion 14 by a swivel bearing 29. Portions other than the crank portion 15A of the drive shaft 15, the bearing 27, and the bearing 28 are disposed inside the housing 1A. On the other hand, the crank portion 15A and the slewing bearing 29 are located outside the housing 1A, but are affected by heat conduction from the drive shaft 15. Further, a pulley 15B is provided on one end side of the drive shaft 15 so as to be located outside the casing 1, and this pulley 15B is, for example, a belt (not shown) on the output side of an electric motor as a drive source. It is connected through. As a result, the drive shaft 15 is rotated by being driven by an electric motor or the like, and causes the orbiting scroll 8 to orbit with respect to the fixed scroll 2.

  A cooling fan 16 is attached to the drive shaft 15 using bolts or the like, and the cooling fan 16 generates cooling air in the fan casing 17. Thereby, as shown in FIGS. 1 and 2, the cooling fan 16 distributes the cooling air along the duct 33 in the fan casing 17 to the inside of the casing 1 or the back side of the scrolls 2, 8. The fixed scroll 2, the orbiting scroll 8, etc. are cooled.

  Further, between the outer diameter side of the back plate 12 and the casing 1, for example, three auxiliary cranks 18 (only one is shown) that prevent the orbiting scroll 8 from rotating are provided.

  A plurality of compression chambers 19 provided between the fixed scroll 2 and the orbiting scroll 8 are sequentially formed from the outer diameter side to the inner diameter side between the wrap portions 4 and 10 and are hermetically sealed by the tip seals 7 and 13. Is held in. Each compression chamber 19 is continuously reduced between the wrap portions 4 and 10 while moving from the outer diameter side to the inner diameter side when the orbiting scroll 8 performs the orbiting motion in the forward direction. .

  As a result, of the compression chambers 19, outside air is sucked into the compression chamber 19 on the outermost diameter side from a suction port 20, which will be described later, and this air is compressed before reaching the compression chamber 19 on the innermost diameter side. Compressed air. The compressed air is discharged from the discharge port 22 and stored in an external storage tank (not shown).

  The suction port 20 provided on the outer diameter side of the fixed scroll 2 opens from the outer diameter side of the end plate 3 to the outer peripheral wall portion 5 and communicates with the compression chamber 19 on the outer diameter side. Further, the suction port 20 is located on the outer diameter side of the wrap portion 10 of the orbiting scroll 8 in the end plate 3 of the fixed scroll 2, and opens in a range (non-sliding region) where the tip seal 13 does not slide. . The suction port 20 sucks, for example, atmospheric air through the suction filter 21 into the compression chamber 19 on the outer diameter side.

The suction port 20 may be configured to suck in pressurized air. In this case, it is good also as a structure which removes the suction filter 21 and connects the suction inlet 20 to piping to which pressurized air is supplied.
Reference numeral 22 denotes a discharge port provided on the inner diameter side (center side) of the end plate 3 of the fixed scroll 2. The discharge port 22 communicates with the compression chamber 19 on the innermost diameter side, and the compressed air in the compression chamber 19 is connected to the outside. Are discharged.

  The face seal groove 25 provided on the end surface of the fixed scroll 2 facing the end plate 9 of the orbiting scroll 8 is located on the outer diameter side of the outer peripheral wall portion 5 and is formed in an annular shape surrounding the outer peripheral wall portion 5. . An annular face seal 26 is attached in the face seal groove 25. The face seal 26 hermetically seals between the end face of the fixed scroll 2 and the end plate 9 of the orbiting scroll 8, and prevents air sucked into the outer peripheral wall portion 5 from leaking therebetween.

  A ventilation hole 30 provided between the bearing 27 and the bearing 28 on the cylindrical housing 1A constituting a part of the casing 1 supplies cooling air from the outside to the drive shaft 15 to cool the drive shaft 15. To do. The cooling air that has cooled the drive shaft 15 is sucked into the cooling fan 16 and flows into the duct 33.

  The scroll type air compressor according to this embodiment has the above-described configuration. Next, the operation of the scroll type air compressor will be described.

  First, the drive shaft 15 is rotationally driven by a drive source (not shown) such as an electric motor. Since the crank portion 15A is eccentric with respect to the drive shaft 15, when the drive shaft 15 is rotationally driven, the crank portion 15A supporting the orbiting scroll 15 performs a turning motion. Thereby, the orbiting scroll 8 performs the orbiting movement about the axis OO of the drive shaft 15 in a state where the rotation is prevented by the rotation preventing mechanism. Due to the orbiting motion of the orbiting scroll 8, the compression chamber 19 defined between the lap portion 4 of the fixed scroll 2 and the lap portion 10 of the orbiting scroll 8 is continuously reduced. As a result, the air sucked from the suction port 20 of the fixed scroll 2 can be sequentially discharged in the compression chambers 19 and discharged from the discharge port 22 of the fixed scroll 2 toward the external tank (not shown) as compressed air. it can.

  The cooling of the bearings 27 and 28 and the slewing bearing 29 in this embodiment will be described in comparison with the bearings 27 and 28 and the slewing bearing 29 in the conventional structure shown in FIG.

  Due to the heat generated in the compression chamber 19 by the compression operation and the heat generated by the rotation of the bearings 27 and 28 and the slewing bearing 29, a temperature rise occurs in each part of the compressor. At this time, in the scroll type air compressor in which the vent hole 30 is not provided in the housing 1A of the casing 1 as shown in FIG. 3, the bearings 27 and 28 are cooled by cooling the housing 1A from the outside. For this reason, only the outer ring side is cooled, and the entire bearings 27 and 28 cannot be sufficiently cooled, resulting in a temperature difference between the inner and outer rings of the bearings 27 and 28, which reduces the reliability of the bearings 27 and 28. . In addition, since the entire slewing bearing 29 has a sealed structure, the cooling is performed only from the outer side of the boss portion 14 to the outer ring side, and the entire cooling cannot be sufficiently performed. Therefore, it is difficult to cool the inner ring side of the bearings 27 and 28 and the slewing bearing 29, and it is difficult to ensure the reliability of the bearing by preventing the temperature difference between the inner and outer rings of the bearings 27 and 28 and the slewing bearing 29 described above. there were. Further, when the temperature of the drive shaft 15 rises and a difference in thermal expansion occurs between the housing 1A, a load is generated in the direction of the drive shaft between the bearing 27 and the bearing 28, and the reliability of the bearing 27 and the bearing 28 is reduced. It was.

  On the other hand, in this embodiment, as shown in FIG. 2, outside air reaches the inside of the cylindrical portion through the vent hole 30 provided in the cylindrical portion of the housing 1 </ b> A and cools the drive shaft 15 to come into contact therewith. The bearings 27 and 28 can be effectively cooled. Further, although the slewing bearing 29 is outside the housing 1A, the inner ring of the slewing bearing 29 can be effectively cooled by heat conduction from the drive shaft 15. As a result, the temperature difference between the inner and outer rings of the bearings 27 and 28 and the slewing bearing 29 and the difference in thermal expansion between the drive shaft 15 and the housing 1A are prevented, and the reliability of the bearings 27 and 28 and the slewing bearing 29 is improved. Can be secured. The space between the orbiting scroll 3 and the drive shaft 15 (the portion covered with the housing 1 </ b> A) is partitioned by the casing 1. With this configuration, the cooling air flowing into the duct 33 does not flow into the housing 1A provided with the drive shaft 15 until the fixed scroll 2 and the orbiting scroll 3 are cooled and exit the duct 33. I made it. Thereby, the cooling air flowing in from the outside can cool the drive shaft 15 through the vent hole 30 before cooling the fixed scroll 2 and the orbiting scroll 3. Thereby, the drive shaft 15 can be efficiently cooled without being affected by the fixed scroll 2 and the orbiting scroll 3 that are likely to become high temperatures due to the compression heat generated in the compression chamber 19.

  As described above, according to this embodiment, the temperature of the bearings 27 and 28 and the slewing bearing 29 is reduced by efficiently cooling the drive shaft 15 without providing a vent hole in the drive shaft 15, and the scroll compressor. The reliability can be improved without reducing the workability and productivity.

  A second embodiment of the present invention is shown in FIG. The same parts as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted. The feature of the present embodiment is that two or more of the vent holes 30 described above are provided as an inlet and an outlet for cooling air. Thereby, since more cooling air flows through the drive shaft, the drive shaft 15 can be cooled more efficiently than in the first embodiment.

A third embodiment of the present invention is shown in FIGS. The same parts as those in the first and second embodiments are denoted by the same reference numerals, and description thereof is omitted. The feature of this embodiment is that two or more vent holes 30 are arranged at a distance in the axial direction of the housing 1A. As a result, air can be blown around the drive shaft 15 due to the pressure difference between the holes generated by the cooling fan 16, and more cooling air can be circulated through the drive shaft 15. According to the present embodiment, the drive shaft 15 can be cooled more efficiently than in the first and second embodiments. In the modification shown in FIG. 6, the opening of the duct 33 is connected to the vent hole 30 of the housing 1A. did. As a result, the cooling air is not sucked into the duct 33 from other than the ventilation hole 30 of the housing 1A (all the cooling air sucked into the duct 33 is blown through the housing 1A), and more cooling air is generated in the housing 1A. It is possible to circulate and cool the drive shaft 15 more efficiently. In addition, noise generated by the cooling fan 16 can be reduced.

  A fourth embodiment of the present invention is shown in FIGS. Parts that are the same as in the first, second, and third embodiments are given the same reference numerals, and descriptions thereof are omitted. A feature of the present embodiment is that a heat radiating plate 31 is provided on the drive shaft 15 in addition to the hole 30 described above to increase the cooling surface area of the drive shaft 15. Thereby, the drive shaft 15 can be cooled more efficiently than in the first, second, and third embodiments.

  Further, as shown in FIG. 8, the heat radiating plate 31 may be formed in a cooling fan 32 shape. As a result, cooling air can be blown around the drive shaft 15, more cooling air can be circulated through the drive shaft 15 than in FIG. 7, and the drive shaft 15 can be cooled more efficiently. it can.

  Further, as shown in FIG. 9, the cooling fan 16 may not be provided on the drive shaft 15, but only the cooling fan 32 formed by the heat radiating plate 31 may be provided. Thereby, in addition to the effects obtained in the first, second, and third embodiments, noise generated by the cooling fan 16 can be reduced.

  The embodiments described so far are merely examples of implementation in carrying out the present invention, and the technical scope of the present invention is not limitedly interpreted by these. That is, the present invention can be implemented in various forms without departing from the technical idea or the main features thereof. Further, the present invention may be implemented by combining the first to fourth embodiments.

  Moreover, although the Example demonstrated so far demonstrated and mentioned as an example the case where it applied to a scroll type air compressor as a scroll type fluid machine, this invention is not limited to this, The refrigerant compressor etc. which compress a refrigerant | coolant etc. The present invention may be applied to other scroll type fluid machines.

DESCRIPTION OF SYMBOLS 1 Casing 1A Housing 2 Fixed scroll 3,9 End plate 4,10 Lapping part 5 Outer peripheral wall part 6,11 Cooling fin 7,13 Chip seal 8 Orbiting scroll 12 Back plate 14 Boss part 15 Drive shaft 15A Crank part 15B Pulley 16 Cooling fan DESCRIPTION OF SYMBOLS 17 Fan casing 18 Auxiliary crank 19 Compression chamber 20 Suction port 21 Suction filter 22 Discharge port 23 Fixed scroll inclination part 24 Flange 25 Face seal groove 26 Face seal 27 Bearing 28 Bearing 29 Slewing bearing 30 Ventilation hole 31 Radiation fin 32 Cooling fan 33 Duct

Claims (9)

A fixed scroll provided with a spiral wrap;
A orbiting scroll provided with a spiral wrap portion constituting a plurality of compression chambers between the fixed scroll lap portion;
A drive shaft for rotating the orbiting scroll by rotating, and
A casing that covers the drive shaft, and a casing that partitions a space in which the housing is disposed and a space in which the fixed scroll and the orbiting scroll are disposed;
A cooling fan provided on the drive shaft;
A duct for circulating cooling air generated by the cooling fan to the fixed scroll and the orbiting scroll,
A scroll type fluid machine, wherein a vent hole for supplying cooling air to the drive shaft is provided on a side surface of a cylindrical portion covering the drive shaft of the housing.   2. The scroll fluid machine according to claim 1, wherein the cooling air flowing into the duct flows through the fixed scroll and the orbiting scroll and does not flow into the drive shaft until the duct exits the duct.   The scroll fluid machine according to claim 1, wherein a bearing that supports the drive shaft is disposed in the housing.   2. The scroll fluid machine according to claim 1, wherein the drive shaft includes a crank portion coupled to the orbiting scroll, and the crank portion is supported by the orbiting scroll with respect to the orbiting scroll. .   The scroll type fluid machine according to claim 1, wherein the cooling air flowing into the housing flows into the duct by the cooling fan.   The scroll fluid machine according to claim 1, wherein a plurality of the vent holes are provided. The scroll fluid machine according to claim 6, wherein the plurality of vent holes are arranged at a distance in the axial direction on the housing .   The scroll fluid machine according to claim 1, wherein a heat radiating plate is provided on the drive shaft.   The scroll fluid machine according to claim 1, wherein the vent hole of the housing and the opening of the duct are connected.

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