Compressor

Abstract

To provide a compressor that has its noise reduced more.SOLUTION: A compressor comprises a compressor body, an electric motor which has a revolving shaft extending along an axis and drives the compressor body with the revolving shaft, and a housing which houses the compressor body and electric motor, and the electric motor has a rotor capable of rotating on an axis and an annular stator around the axis. The housing has a housing body and a pair of high rigidity parts which are provided at positions opposed in a diameter direction outside the housing body, and have higher rigidity than other parts, and the stator is fixed to an inner peripheral surface of the housing at a plurality of fixation points provided at different positions from intersections of a first straight line connecting the pair of high rigidity parts and a second straight line orthogonal to the first straight line, and the housing.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present disclosure relates to a compressor. [Background technology]

[0002] For example, scroll compressors are known as one type of compressor installed in automobiles. A scroll compressor includes a compressor body that compresses a refrigerant, an electric motor that drives the compressor body, and a housing that accommodates the compressor body and the electric motor. The electric motor has a rotor that can rotate about an axis and a stator that covers the rotor from the outer periphery. The stator is annular and centered on the axis, and is fixed to the inner periphery of the housing by bolting or shrink fitting (for example, see Patent Document 1 below).

[0003] Mounting legs are formed on the outer circumferential surface of the housing to secure the scroll compressor to a predetermined position in the automobile. Therefore, the portions where the mounting legs are formed have higher rigidity than other portions. Typically, a pair of mounting legs are provided at diametrically opposed positions on the housing, and one additional leg is provided at another position. When considering vibration modes associated with motor operation, it is known that elliptical mode vibration occurs, with a first line connecting the pair of diametrically opposed mounting legs and a second line perpendicular to the first line as the minor axis and major axis, respectively. Furthermore, due to the annular shape, it is known that elliptical mode vibration also occurs in the stator. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 2719819 Summary of the Invention [Problem to be solved by the invention]

[0005] When the vibration modes of the housing and the stator are superimposed as described above, the vibrations may diverge, resulting in increased noise from the compressor.

[0006] The present disclosure has been made to solve the above-mentioned problems, and has an object to provide a compressor with further reduced noise. [Means for solving the problem]

[0007] In order to solve the above problems, a compressor according to the present disclosure includes a compressor body, an electric motor having a rotary shaft extending along an axis and driving the compressor body by the rotary shaft, and a cylindrical housing centered on the axis and accommodating the compressor body and the electric motor, wherein the electric motor has a rotor rotatable about the axis and an annular stator centered on the axis, The housing includes a housing body and and a pair of mounting legs fixed to the housing body at positions on the outside of the housing body that are diametrically opposed to the axis, and the portions of the housing body to which the pair of mounting legs are fixed, and which have higher rigidity than other portions, are designated as high-rigidity portions, and the stator is fixed to the inner surface of the housing body at a plurality of fixing points that are located at positions different from the intersection of a first line connecting the pair of high-rigidity portions of the housing body and passing through the axis, and a second line that is perpendicular to the first line and passes through the axis, as viewed from the axial direction, with the inner surface of the housing body, and the plurality of fixing points are located at positions that are geometrically farthest from the intersection of the first line and the second line with the housing, as viewed from the axial direction. A compressor according to the present disclosure includes a compressor body, an electric motor having a rotary shaft extending along an axis and driving the compressor body by the rotary shaft, and a cylindrical housing centered on the axis and accommodating the compressor body and the electric motor, wherein the electric motor has a rotor rotatable about the axis and an annular stator centered on the axis, The housing includes a housing body anda pair of mounting legs fixed to the housing body at positions on the outside of the housing body that are diametrically opposed to the axis, and portions of the housing body to which the pair of mounting legs are fixed are high-rigidity portions, and the stator is fixed to the inner peripheral surface of the housing body at a plurality of fixing points that are provided at positions different from an intersection of a first line connecting the pair of high-rigidity portions of the housing body and passing through the axis, and a second line perpendicular to the first line and passing through the axis, as viewed from the axial direction, with the inner peripheral surface of the housing body, and one When an elliptical mode vibration occurs with one axis as the major axis and the other as the minor axis, the minor axis and the major axis do not overlap with each other between the elliptical mode of the housing body and the elliptical mode of the stator. [Effects of the Invention]

[0008] According to the present disclosure, it is possible to provide a compressor with further reduced noise. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a cross-sectional view showing a configuration of a compressor according to an embodiment of the present disclosure. [Figure 2] FIG. 2 is a cross-sectional view taken along line II-II in FIG. [Figure 3] FIG. 10 is a cross-sectional view illustrating a modified example of a compressor according to an embodiment of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0010] (Compressor configuration) A scroll compressor 100 as a compressor according to an embodiment of the present disclosure will be described below with reference to Figures 1 and 2. The scroll compressor 100 is used, for example, to compress refrigerant in an air conditioner for a vehicle. As shown in Figure 1, the scroll compressor 100 includes a shaft 1 (rotating shaft), a motor 2 (electric motor), a compressor body 3, a housing 4, a cover 5, an upper bearing 6, a lower bearing 7, and a drive bush 8.

[0011] (Shaft configuration) The shaft 1 extends along an axis O and is rotatable about the axis O. The shaft 1 has a shaft body 10, a small diameter portion 11, a large diameter portion 12, and an eccentric shaft portion 13. The shaft body 10 is cylindrical and has a center on the axis O. The shaft body 10 has a uniform diameter dimension throughout the entire area in the direction of the axis O. A rotor 21 (described below) of the motor 2 is attached to the outer peripheral surface of the shaft body 10.

[0012] A small diameter portion 11 is provided on one side (lower side) of the shaft body 10 in the direction of the axis O. The small diameter portion 11 is cylindrical and centered on the axis O, and has a smaller diameter dimension than the shaft body 10. The small diameter portion 11 is supported from one side (lower side) in the direction of the axis O by a lower bearing 7 attached to the housing 4.

[0013] A large diameter portion 12 is provided on the other side (upper side) of the shaft body 10 in the direction of the axis O. The large diameter portion 12 is cylindrical and centered on the axis O, and has a larger diameter dimension than the shaft body 10. The large diameter portion 12 is supported in the radial direction by an upper bearing 6 fixed to the housing 4.

[0014] An eccentric shaft portion 13 is provided further above the large diameter portion 12 (on the other side in the direction of the axis O). The eccentric shaft portion 13 protrudes from the large diameter portion 12 toward the other side in the direction of the axis O. The eccentric shaft portion 13 is parallel to the axis O and has a cylindrical shape centered on an eccentric axis A that extends at a position radially offset from the axis O. Therefore, when the shaft 1 rotates, the eccentric shaft portion 13 revolves (orbits) around the axis O.

[0015] (Motor configuration) The motor 2 applies a rotational driving force to the shaft 1. The motor 2 has a rotor 21 and a stator 22. The rotor 21 is fixed to the shaft body 10. The rotor 21 is cylindrical and has an axis O as its center. Although not shown in detail, the rotor 21 has a plurality of magnets. The stator 22 covers the rotor 21 from the outer periphery. The stator 22 is formed by stacking a plurality of steel plates in the direction of the axis O and further winding copper wire thereon (forming a coil). When current is applied to the stator 22, an electromagnetic force is generated between the stator 22 and the rotor 21, and a rotational force about the axis O is applied to the rotor 21. This causes the shaft 1 to rotate about the axis O.

[0016] (Configuration of the compressor body) The compressor body 3 is driven by rotation of the shaft 1 by the motor 2. The compressor body 3 has a fixed scroll 31 and a movable scroll 32. The fixed scroll 31 has a disk-shaped first end plate 31a centered on the axis O, and a first spiral plate 31b provided on one side (lower side) of the first end plate 31a in the direction of the axis O. The first spiral plate 31b extends in a spiral shape centered on the axis O. The fixed scroll 31 is fixed to the housing 4.

[0017] The movable scroll 32 has a disk-shaped second end plate 32a, a second spiral plate 32b provided on the other side (upper side) of the second end plate 32a in the direction of the axis O, and a boss portion 32c. The second spiral plate 32b extends in a spiral shape centered on the axis O. The dimension of the second spiral plate 32b in the direction of the axis O is equal to the dimension of the above-mentioned first spiral plate 31b in the direction of the axis O. In this way, the first spiral plate 31b and the second spiral plate 32b mesh with each other in the direction of the axis O, thereby forming a compression chamber therebetween.

[0018] The boss portion 32c is a cylindrical portion that protrudes from the second end plate 32a toward one side (downward) in the direction of the axis O. The boss portion 32c is attached to the eccentric shaft portion 13 of the shaft 1 via the drive bush 8. When the eccentric shaft portion 13 orbits around the axis O, an orbiting force is transmitted to the movable scroll 32 through the drive bush 8. As a result, the movable scroll 32 orbits around the axis O. Although not shown in detail, the rotation (spinning) of the movable scroll 32 itself is restricted by an Oldham ring.

[0019] As the movable scroll 32 orbits, the volume of the compression chamber changes over time, and the refrigerant is compressed as it is sent from the outside to the inside in the radial direction within the compression chamber, increasing its pressure. The high-pressure refrigerant is introduced into the housing 4 through an opening H formed in the first end plate 31a of the fixed scroll 31.

[0020] The housing 4 has a housing main body 41 and mounting legs 42 (high-rigidity portions). The housing main body 41 is a cylindrical container with a bottom that houses the shaft 1, the motor 2, and the compressor main body 3. The mounting legs 42 are members for fixing the scroll compressor 100 in a predetermined position. As shown in FIG. 2, a pair of mounting legs 42 are provided at positions facing each other in a diameter direction passing through the axis O. The portion of the housing main body 41 where the mounting legs 42 are provided has a greater thickness, making it more rigid than other portions.

[0021] The cover 5 is attached to one side (lower side) of the housing body 41 in the direction of the axis O. Although not shown in detail, electrical components including an IPM (intelligent power module) and the like are housed inside the cover 5.

[0022] (Relationship between stator and housing) 2, the stator 22 of the motor 2 is fixed to the inner peripheral surface 4s of the housing 4 by shrink fitting. More specifically, the outer peripheral surface 22s of the stator 22 is tightly fitted to the inner peripheral surface 4s of the housing 4 at four fixing points P that are equally spaced apart in a square pattern. Here, the line connecting the pair of mounting legs 42 described above is referred to as a first line L1, and the line perpendicular to the first line L1 is referred to as a second line L2.

[0023] Because the housing main body 41 has a circular cross section, it is prone to vibration in an elliptical mode with the first line L1 and the second line L2 as the major axis and the minor axis. The four fixed points P are located at positions different from the intersections of the first line L1 and the second line L2 with the housing main body 41. In other words, the four fixed points P are not located on the first line L1 or the second line L2. Furthermore, the fixed points P are located at positions rotated 45° with respect to the first line L1 and the second line L2. Therefore, all of the fixed points P are geometrically farthest from the intersections of the first line L1 and the second line L2 with the housing main body 41.

[0024] (Action and effect) Here, it is known that during operation of the scroll compressor 100, the above-mentioned elliptical mode vibration occurs not only in the housing body 41 but also in the stator 22. If the elliptical mode of the housing body 41 and the elliptical mode of the stator 22 are superimposed on each other (that is, if the major axis direction and the minor axis direction of these two elliptical modes coincide with each other), the vibrations of both modes are compounded and may ultimately diverge.

[0025] Therefore, in this embodiment, the four fixed points P are disposed at positions different from the intersections of the first line L1 and the second line L2 with the housing main body 41. This prevents the minor and major axes of the elliptical mode of the housing main body 41 and the elliptical mode of the stator 22 from overlapping with each other. This reduces the possibility of vibration divergence. As a result, the noise of the scroll compressor 100 can be reduced.

[0026] Furthermore, with the above configuration, since the multiple fixing points P are arranged at equal intervals, it is less likely that the deformation of the stator 22 will be uneven in the circumferential direction, which makes it possible to further suppress the occurrence of elliptical mode vibration.

[0027] Generally, electric motors are driven by three-phase AC. Therefore, if the number of fixed points were a multiple of three, there would be a possibility that vibrations excited by electromagnetic forces based on the respective currents would resonate or develop over time. However, with the above configuration, four fixed points are provided in a square pattern, rather than a multiple of three, which reduces this possibility.

[0028] The above describes the embodiments of the present disclosure. It should be noted that various changes and modifications can be made to the above configuration without departing from the spirit and scope of the present disclosure. For example, in the above embodiment, an example was described in which the stator 22 is shrink-fitted to the housing 4 using the fixing points P. However, the fixing points P are not limited to shrink-fitting, and the stator 22 can also be fastened to the housing 4 using bolts.

[0029] Furthermore, in the above embodiment, an example has been described in which four fixed points P are arranged in a square shape. However, as a modified example, it is also possible to arrange five fixed points P in a regular pentagonal shape, as shown in FIG. 3. In this case, none of the fixed points P are located on the first line L1 or the second line L2. This configuration can also reduce the possibility of resonance with vibrations based on three-phase AC, just like four fixed points P arranged in a square shape.

[0030] <Additional Notes> The compressor (scroll compressor 100) described in each embodiment can be understood, for example, as follows.

[0031] (1) A compressor according to a first aspect includes a compressor body 3, an electric motor (motor 2) having a rotating shaft (shaft 1) extending along an axis O and driving the compressor body 3 via the rotating shaft, and a cylindrical housing 4 centered on the axis O and accommodating the compressor body 3 and the electric motor. The electric motor has a rotor 21 that can rotate around the axis O and an annular stator 22 centered on the axis O. The housing 4 includes a housing body 41 and a pair of high-rigidity portions (mounting legs 42) that are provided outside the housing body 41 and diametrically opposed to the axis O and have higher rigidity than other portions. The stator 22 is fixed to the inner surface of the housing 4 at a plurality of fixing points P that are provided at positions different from the intersection of the housing 4 with a first straight line L1 connecting the pair of high-rigidity portions and a second straight line L2 perpendicular to the first straight line L1.

[0032] According to the above configuration, the elliptical mode of vibration of the housing 4 and the elliptical mode of vibration of the stator 22 do not overlap with each other, thereby reducing the possibility of vibration divergence.

[0033] (2) In the compressor according to the second aspect, the plurality of fixing points P are arranged at equal intervals in the circumferential direction about the axis O.

[0034] According to the above configuration, since the plurality of fixing points P are arranged at equal intervals, it is less likely that the deformation of the stator 22 will be uneven in the circumferential direction, which makes it possible to further suppress the occurrence of elliptical mode vibration.

[0035] (3) In the compressor according to the third aspect, the plurality of fixing points P are arranged in a square shape.

[0036] Generally, electric motors are driven by three-phase AC. Therefore, if the number of fixed points P were a multiple of three, there would be a possibility that vibrations excited by electromagnetic forces based on the respective currents would develop over time. However, with the above configuration, four fixed points P are provided in a square pattern, rather than a multiple of three, which reduces this possibility.

[0037] (4) In the compressor according to the fourth aspect, the plurality of fixing points P are arranged in a regular pentagonal shape.

[0038] Generally, electric motors are driven by three-phase AC. Therefore, if the number of fixed points P were a multiple of three, there would be a possibility that vibrations excited by electromagnetic forces based on the respective currents would develop over time. However, with the above configuration, five fixed points P are provided in a regular pentagonal shape, rather than a multiple of three, which reduces this possibility. [Explanation of symbols]

[0039] 100 Scroll Compressor 1 shaft 2 motors 3 Compressor body 4. Housing 4s Inner surface 5 Cover 6 Upper bearing 7 Lower bearing 8 Drive bush 10 Shaft body 11 Small diameter section 12 Large diameter section 13 Eccentric shaft part 21 rotor 22 Stator 22s outer surface 31 Fixed Scroll 31a First end plate 31b First spiral plate 32 movable scroll 32a Second end plate 32b Second spiral plate 32c boss part 41 Housing body 42 Mounting legs A Eccentric shaft H opening L1 First straight line L2 Second straight line O axis P fixed point

Claims

1. A compressor body, an electric motor having a rotary shaft extending along an axis and driving the compressor body by the rotary shaft; a housing having a cylindrical shape centered on the axis and accommodating the compressor body and the electric motor; Equipped with The electric motor is a rotor rotatable about the axis; an annular stator centered on the axis; and The housing includes: A housing body; a pair of mounting legs fixed to the housing body at positions on the outside of the housing body that are diametrically opposed to each other with respect to the axis; and a portion of the housing main body to which the pair of mounting legs are fixed, the portion being made more rigid than other portions, the portion being a high-rigidity portion; the stator is fixed to the inner peripheral surface of the housing body at a plurality of fixing points provided at positions different from an intersection of a first line connecting the pair of high-rigidity portions in the housing body and passing through the axis and a second line perpendicular to the first line and passing through the axis, with the inner peripheral surface of the housing body, as viewed from the axial direction; The compressor, wherein the plurality of fixing points are arranged at positions geometrically farthest from the intersections of the first line and the second line with the housing when viewed from the axial direction.

2. A compressor body, an electric motor having a rotary shaft extending along an axis and driving the compressor body by the rotary shaft; a housing having a cylindrical shape centered on the axis and accommodating the compressor body and the electric motor; Equipped with The electric motor is a rotor rotatable about the axis; an annular stator centered on the axis; and The housing includes: A housing body; a pair of mounting legs fixed to the housing body at positions on the outside of the housing body that are diametrically opposed to each other with respect to the axis; and a portion of the housing main body to which the pair of mounting legs are fixed, the portion being made more rigid than other portions, the portion being a high-rigidity portion; the stator is fixed to the inner peripheral surface of the housing body at a plurality of fixing points provided at positions different from an intersection of a first line connecting the pair of high-rigidity portions in the housing body and passing through the axis and a second line perpendicular to the first line and passing through the axis, with the inner peripheral surface of the housing body, as viewed from the axial direction; When vibration in an elliptical mode occurs, one of the first straight line and the second straight line is the major axis and the other is the minor axis, The compressor has a configuration in which the minor axis and the major axis do not overlap with each other between the elliptical mode of the housing body and the elliptical mode of the stator.

3. 3. The compressor according to claim 1, wherein the plurality of fixing points are arranged at equal intervals in the circumferential direction about the axis.

4. The compressor according to claim 1 , wherein the plurality of fixing points are arranged in a square pattern.

5. The compressor according to claim 1 , wherein the plurality of fixing points are arranged in a regular pentagonal shape.

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