• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    In a compressor comprising a compressor body and a motor integrated with each other and with the structure in which the sub-assembly of the motor part and the compressor body are arranged by positioning the centers of the motor housing and compressor housing with positioning pins, when the deformation of the flange surface of the motor housing is large on the compressor housing side, the positioning pin holes may have placement dimensions where positioning is difficult.
    公开号:BE1022584B1
    申请号:E2014/0533
    申请日:2014-07-09
    公开日:2016-06-10
    发明作者:Kiminori Iwano；Yoshio Kobayashi
    申请人:HITACHI INDUSTRIAL EQUIMENT SYSTEMS Co.,Ltd；
    IPC主号:
    专利说明:

    Scroll type fluid machine
    DOMAIN OF THE INVENTION
    The present invention relates to a scroll type fluid machine.
    BACKGROUND OF RELATED ART
    A scroll compressor in which a conventional compressor and a motor are integrated with each other is described in JP-A No. 2009257337. JP-A No. 2009-257337 describes a structure comprising a compressor body that includes a fixed scroll and a rotating scroll and a motor portion that causes the rotating scroll to rotate. The output shaft of the motor is coupled to the drive shaft of the rotating scroll via the shaft coupling and the cooling fan. SUMMARY OF THE INVENTION
    In the scroll compressor of JP-A No. 2009-257337 where the compressor and the motor are integrated with each other, the output shaft of the motor and the drive shaft of the rotating scroll are separated from each other. In the assembly process thereof, the sub-assembly of the motor section and the compressor body including the compressor housing are assembled in the final process. At this time, the so-called key connection is usually provided, the centers of the motor housing and compressor housing being positioned by using a precision machined annular convex on one flange part and a precision machined annular concave on the other flange part.
    Here, as the key connection distorts in the sub-assembly process of the motor housing, the centers may shift. Consequently, the construction in which positioning pins are used to position the centers can be considered. However, when the deformation of the flange surface of the motor housing on the side of the compressor housing becomes large due to the tightening of the bolts for the motor stator, the bolts affecting the deformation of the flange surface in the sub-assembly process the positioning pins have placement dimensions where the positioning of the motor housing and compressor housing is difficult. Therefore, it may be necessary to provide the motor housing with a shape that achieves high rigidity so that the placement dimensions of the pinholes of the motor housing are not changed after the sub-assembly process.
    To address the aforementioned disadvantage, it is desirable to provide, within a motor housing, mounting locations where a motor stator is mounted by means of mounting elements and ribs reinforcing the mounting locations.
    By providing the ribs that reinforce the mounting locations in the motor housing, the rigidity of the motor housing can be increased, and the change of the placement dimensions of the pinholes used to position the motor housing can be prevented.
    BRIEF DESCRIPTION OF THE DRAWINGS
    FIG. 1 shows a longitudinal section of a scroll compressor of this example;
    FIG. 2A shows a rear view of a motor housing as a reference example;
    FIG. 2B shows a perspective view of the motor housing as a reference example;
    FIG. 3 shows an exploded view of an electric motor of this example;
    FIG. 4A shows a rear view of the motor housing of this example;
    FIG. 4B shows a perspective view of the motor housing of this example;
    FIG. 5A shows a perspective view of a compressor housing of this example; and
    FIG. 5B shows a perspective view of the electric motor. DESCRIPTION OF PREFERRED EMBODIMENTS
    Examples of the present invention are described below with the aid of the drawings.
    FIG. 1 is a longitudinal section of a scroll compressor of this example. FIG. 1 shows a full scroll compressor 1 comprising a scroll type air compressor body and an electric motor 5. The air compressor body comprises a compressor housing 2, a fixed scroll 3, a rotating scroll 4, a drive shaft 10, a crank section 11, and rotation prevention mechanisms 17 which prevent the rotation of the rotating scroll.
    As shown in FIG. 1, the compressor housing 2, which forms the outer shell of the compressor body, is formed as a covered cylindrical body that is closed on the first side in the drive shaft direction and that is open on the second side in the drive shaft direction. In other words, the compressor housing 2 essentially comprises: a cylindrical portion 2A opened on the second side of the drive shaft direction (on the side of the fixed scroll 3); an annular bottom portion 2B integrally formed on the first side of the cylindrical portion 2A in the drive shaft direction and extending radially inward; and a cylindrical mounting portion 2C for the electric motor 5. The mounting portion 2C protrudes from the inner circumference of the lower portion 2B to the opposite sides in the drive shaft direction.
    Within the cylindrical part 2A of the compressor housing 2, the rotating scroll 4 mentioned below, the crankshaft part 11, the rotation prevention mechanisms 17, etc. are accommodated. The multiple rotation prevention mechanisms 17 (only one of which is illustrated in Fig. 1) are provided toward the bottom portion 28 of the compressor housing 2 at certain circumferential intervals between the bottom portion 2B and a hereafter end plate 4A of the rotating scroll 4 .
    Pen holes 2E are precision machined to the mounting portion 2C to position the compressor housing 2 and a motor housing 15, as described later.
    Each of the multiple rotation prevention mechanisms 17 provided between the lower portion 2B of the compressor housing 2 and the rear of the rotating scroll 4 is formed from, for example, an auxiliary crank 19, an auxiliary crankshaft bearing 20 on the side of the compressor housing 2, and an auxiliary crankshaft bearing 21 on the side of the rotating scroll 4. The auxiliary crankshaft bearing 20 is housed in a bearing projection 2D provided on the compressor housing 2. The auxiliary crankshaft bearing 21 is housed in a bearing projection 6B provided on the bearing rotating scroll 4.
    The rotation prevention mechanisms 17 prevent rotation of the rotating scroll 4, and ensure that the side of the lower portion 2B of the compressor housing 2 receives an impact load from the rotating scroll 4.
    The fixed scroll 3 is attached to the open end side of the compressor housing 2 (cylindrical portion 2A) as a scroll element. The fixed scroll 3 essentially comprises: an end plate 3A formed to have a disc shape; a spiral revolution portion 3B raised on the surface of the end plate 3A; a cylindrical support portion 3C provided on the outer circumference of the end plate 3A to radially externally surround the revolution portion 3B and attached to the open end of the compressor housing 2 (cylindrical portion 2A) using, for example, different bolts (not shown); and a cooling fin 3D located opposite the revolution portion 3B over the end plate 3A.
    The rotating scroll 4 forms another scroll element. The rotating scroll 4 is provided in the compressor housing 2 opposite the fixed scroll 3 in the drive shaft direction and capable of rotating therein. As shown in FIG. 1, the rotating scroll 4 comprises: the end plate 4A with a disk shape; a revolution portion 4B raised on the surface of the end plate 4A, a plurality of cooling fins 4C raised on the opposite side of the revolution portion 4B; and a cylindrical plate protruding portion 6 extending from the rear of the end plate 4A (opposite to the lap portion 4B) and being attached to the crank portion 11 hereafter referred to via a rotating bearing 13.
    The rotation prevention mechanisms 17 mentioned below are located on the outer diameter side of the plate projection portion 6 in the circumferential direction of the rotating scroll 4 at predetermined intervals between the plate projection portion 6 and the lower portion 2B of the compressor housing 2. The center of the The plate protrusion portion 6 of the rotating scroll 4 is radially shifted relative to the center of the fixed scroll 3 by a predetermined distance (path radius).
    The rotating bearing 13 is located between the plate protruding portion 6 of the rotating scroll 4 and the crank portion 11. The rotating bearing 13 supports a protruding portion 6A of the rotating scroll 4 such that the protruding portion 6A can rotate relative to the crank portion 11, to compensate for the rotation of the rotating scroll 4 relative to the axis of the drive shaft 10 with a predetermined path radius.
    The drive shaft 10 is rotatably provided via bearings 5A and 5B of the electric motor 5 and rotatably driven by the electric motor 5 detachably coupled to the compressor housing 2. The protruding part 6A of the rotating scroll 4 is coupled to and able to rotate relative to from the top end side of the drive shaft 10 (the second side in the drive shaft direction) via the below-mentioned crank section 11 and the rotating bearing 13.
    A balance weight 12 is provided on the drive shaft 10 to stabilize the rotation of the rotating scroll 4, and rotates together with the drive shaft 10 during compression.
    The crank portion 11 is fully provided with the upper end side of the drive shaft 10, and coupled to the protruding portion 6A of the rotating scroll 4 via the rotating bearing 13. The crank portion 11 rotates together with the drive shaft 10. This is the moment at which the rotation is converted to rotating the rotating scroll 4 via the rotating bearing 13.
    A cooling fan 22 is attached to the rear end of the drive shaft 10, and rotates together with the drive shaft 10 to generate cooling air. The cooling air is directed to the cooling ribs 3D of the fixed scroll 3 and the cooling ribs 4C of the rotating scroll 4 through an air guiding channel 23, and passes between the ribs and through the plate protruding part 6 on the side of the compressor housing 2 around each part warmed by cooling compression heat.
    Multiple compression chambers 7 are arranged between the revolution section 3B of the fixed scroll 3 and the revolution section 4B of the rotating scroll 4. As shown in FIG. 1, the compression chambers 7 are arranged to overlap the revolution section 4B of the rotating scroll 4 with the revolution section 3B of the fixed scroll 3, and formed to be clamped by the end plates 3A and 4A between the revolution sections 3B and 4B.
    A suction opening 8 is provided on the outer circumference of the fixed scroll 3. The suction opening 8 breathes in air from outside via a suction filter. The air is continuously compressed with the rotation of the rotating scroll 4 in each compression chamber 7.
    A discharge opening 9 is provided on the center side of the fixed scroll 3. The discharge opening 9 empties compressed air from the compression space 7 at the inner diameter to a reservoir (not shown).
    The electric motor 5 is provided at the rear of the compressor to rotate the drive shaft 10, rotatably supported by bearings 5A and 5B.
    That is, the rotating scroll 4 is driven by the electric motor 5 via the drive shaft 10 and crank section 11, and rotates relative to the fixed scroll 3 while rotation is prevented by the rotation prevention mechanisms 17.
    Thus, the compression chamber 7 at the outer diameter, as part of the multiple compression chambers 7, inhales air from the suction opening 8 of the fixed scroll 3. The inhaled air is continuously compressed in each compression chamber 7. The compression chamber 7 at the inner diameter empties compressed air from the outlet opening 9 located on the middle side of the end plate 3A to the outside.
    The electric motor part of this example is explained below. As shown in FIG. 1, the electric motor 5 comprises a motor stator 5C arranged in the motor housing 15 and a rotor 5E provided concentrically with the drive shaft 10.
    FIG. 2A shows a rear view of the motor housing as a reference example. FIG. 2B shows a perspective view of the motor housing as a reference example. FIG. 2A is the rear view of the motor housing seen from the side opposite the side attached to the compressor housing. FIG. 2B is its perspective view. In Figures 2A and 2B, the motor housing 25 comprises: a protrusion 15F that defines the position of the motor stator 5C in the drive shaft direction; mounting locations 15A for mounting bolts 5F, which mounting means are for mounting the motor stator 5C, the mounting locations 15A located separately from the projection 15F at a certain distance in the drive shaft direction; a flange surface 15B which is a coupling surface for the compressor housing 2; and pinholes 15C on the flange surface 15B for the compressor housing, the pinholes 15C being precision machined to the same size as those of the below-mentioned pinholes 2E of the compressor housing 2 to insert positioning pins for the compressor housing 2.
    The assembly order of the electric motor 5 is explained below. FIG. 3 is an exploded view of the electric motor of this example. In FIG. 3, the motor stator 5C is first inserted into the motor housing 15. The motor stator 5C and protrusion 15F are in contact with each other to define the position of the motor stator 5C in the drive shaft direction.
    A bearing 5B is then inserted into a bearing housing 14. The bearing housing 14 then fits into the motor housing 15 in which the motor stator 5C is placed.
    The mounting bolts 5F are inserted into the electric motor 5 along the bearing housing 14 side, and attached to the mounting locations 15A provided in the motor housing 15 through bolt penetration holes 5D provided on the bearing housing 14 and the motor stator 5C. By mounting the fixing bolts 5F through the penetration holes provided in the bearing housing 14 and the motor stator 5C, placement of the wiring from the motor stator 5C to the power source and a wiring opening 14A provided in the bearing housing 14 is achieved. The mounting bolts 5F have a rotation prevention function of the motor stator 5C during compression. Therefore, rotation prevention devices such as screws that are screwed in the radial direction of the motor stator 5C are unnecessary.
    At this time, when the mounting locations 15A are deformed toward the bearing housing 14 by axial tension of the mounting bolts 5F, the flange surface 15B of the motor housing 15 on the side of the compressor housing is deformed. When the flange surface 15B is deformed, the positions of the pinholes 15C are changed so as not to be positioned with the pinholes 2E, which causes a difficult assembly.
    On the other hand, in order to obtain the high efficiency of mounting the scroll compressor, the sub-assembly of the motor 5 and the compressor housing 2 are mounted, prior to the mounting of the compressor section such as the rotating scroll. At that time an opening or notch can be provided for inserting tools, etc., when mounting rotation prevention mechanisms 17 of the rotating scroll in the later processes. In this case, the tools can be easily inserted on the bearings and provide rotation prevention mechanisms 17 from the opening or notch to the motor housing by not providing a bearing housing that receives the bearing 5A. In that case, however, since the rigidity of the flange surface of the motor housing decreases, the deformation of the flange surface by the sub-assembly process becomes greater. When the device of the motor stator mounting bolts and the holes or notches of the flange surface are irregular, the nature of the flange surface deformation is complicated because the device has a great influence on the deformation of the flange surface in the sub-assembly process. Also due to the above factors, the pinholes of the motor housing may have placement dimensions where positioning of the compressor housing is difficult. It is important to increase the rigidity of the motor housing so that the placement dimensions of the pinholes of the motor housing do not change after the sub-assembly process.
    FIG. 4A shows a rear view of the motor housing of this example. FIG. 4B shows a perspective view of the motor housing of this example. FIG. 4A shows the rear view of the motor housing viewed from the side opposite the side attached to the compressor housing. FIG. 4B shows its perspective view. In FIG. 4A and 4B, the same reference numerals are given for the same parts as FIG. 2. The difference lies in that ribs 15E are provided in the space between the protrusion 15F and mounting locations 15A in the motor housing 15 in the drive shaft direction. Accordingly, the ribs 15E serve to reinforce the attachment sites 15A. The ribs 15E are arranged such that the protrusion 15F and each mounting location 15A are spaced apart a certain distance in the drive shaft direction and are completely coupled to each other. The portions with a notch 15D on the motor housing 15 for inserting tools etc. when mounting the rotation prevention mechanisms 17 are in contact with the inside between the rotation prevention mechanisms 17 and motor stator 5C.
    FIG. 5A shows a perspective view of the compressor housing of this example. FIG. 5B shows a perspective view of the electric motor of this example. FIG. 5A shows a perspective view of the compressor housing of this example. FIG. 5B shows a perspective view of the electric motor of this example. In FIG. 5A, the pin holes 2E for positioning the motor housing 15 are formed on the mounting portion of the compressor housing 2. The mounting portion is a coupling surface for the compressor housing 2 and motor housing 15. In FIG. 5B, positioning pins 15G are attached to the pinholes 15C on the flange surface 15B of the motor housing 15. By attaching the positioning pins 15G to the pinholes 2E and pinholes 15C, the pinholes 2E and pinholes 15C are coupled to each other to connect the compressor housing attach to the motor housing.
    As explained above, by providing ribs that reinforce the mounting locations in the motor housing, the rigidity of the motor housing can be increased, and it is possible to prevent placement dimensions of the pinholes 15C of the motor housing from changing, and thus project the electric motor 5 and compressor housing 2 can be accurately positioned. By providing the ribs 15E entirely in the motor housing 15, the accuracy of the positions in the pinholes 15C can be guaranteed without increasing the product size. By providing the ribs to completely engage the protrusion 15F and mounting locations 15A, spaced apart in the drive shaft direction, the rigidity of the motor housing can be increased while the interference between a coil portion 5G provided to the motor stator 5C and the mounting locations 15A can be avoided. Therefore, the deformation of the motor housing can be prevented.
    The present invention is not limited to the above examples, but includes various modifications. For example, the present invention is applicable to piston compressors and screw compressors as long as they are directly coupled engine type compressors.
    权利要求:
    Claims (13)
    [1]
    CONCLUSIONS
    A scroll type fluid machine comprising: a fixed scroll; a rotating scroll provided opposite to the fixed scroll and rotating; a compressor housing in which the fixed scroll and the rotating scroll are accommodated; and an electric motor comprising a drive shaft driving the rotating scroll and a motor stator housed in the motor housing, the motor housing including mounting locations for mounting elements for mounting the motor stator to the motor housing, and ribs reinforcing the mounting locations are provided in the motor housing.
    [2]
    The scroll type fluid machine according to claim 1, wherein the motor housing comprises a protrusion defining a position of the motor stator in the drive shaft direction, and the mounting locations are located separately from the protrusion in the drive shaft direction.
    [3]
    The scroll type fluid machine according to claim 2, wherein the ribs are provided for integrally engaging the protrusion and the mounting locations.
    [4]
    The scroll type fluid machine according to any of claims 1 to 3, wherein first pin holes are provided on a mounting portion of the compressor housing, the mounting portion is used as a interface for the compressor housing and the motor housing, second pin holes are provided on a flange surface of the motor housing, the flange surface is used as a coupling surface of the compressor housing and the motor housing, and the first and second pinholes are coupled with locating pins to attach the compressor housing and the motor housing to each other.
    [5]
    The scroll type fluid machine according to claim 1, comprising: rotation prevention mechanisms that prevent rotation of the rotating scroll, wherein a notch is provided on the motor housing to be in contact with an interior between the motor stator and the rotation prevention mechanisms.
    [6]
    The scroll type fluid machine according to claim 1, wherein a bearing supporting the drive shaft is provided, and no bearing housing is provided for accommodating the bearing.
    [7]
    A compressor comprising: a compressor body for compressing fluid; a drive shaft to drive the compressor body; and an electric motor comprising a motor stator and a motor housing, wherein the motor stator includes bolt penetration holes provided in the drive shaft direction, the motor housing has mounting locations to which mounting bolts are attached to secure the motor stator to the motor housing through the bolt penetration holes, and the motor housing includes ribs that prevent deformation of the motor housing at a time of mounting the mounting bolts.
    [8]
    The compressor of claim 7, wherein the motor housing comprises a protrusion to determine a position of the motor stator in the drive shaft direction, and the mounting locations are separate from the protrusion in the drive shaft direction.
    [9]
    The compressor according to claim 8, wherein the ribs are provided for completely engaging the protrusion and the mounting locations.
    [10]
    The compressor according to any of claims 7 to 9, wherein the compressor body comprises a compressor housing which forms an outer casing, first pin holes are provided on the mounting part of the compressor housing, the mounting part is used as a coupling surface of the compressor housing and the motor housing, second pinholes are provided on the flange surface of the motor housing, the flange surface is used as interfaces of the compressor housing and the motor housing, and the first and second pinholes are coupled by positioning pins to attach the compressor housing to the motor housing.
    [11]
    The compressor of claim 7, wherein a notch is provided on the motor housing to be in contact with an interior.
    [12]
    The compressor of claim 7, wherein the mounting locations and the ribs are provided within the motor housing.
    [13]
    The compressor of claim 7, wherein a bearing supporting the drive shaft is provided, and no bearing housing is provided for accommodating the bearing.
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    JP201320298|2013-09-30|
    JP2013202986A|JP6153836B2|2013-09-30|2013-09-30|Scroll type fluid machine|
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