JP2010041851A - Structure of fixing stator and casing, and compressor equipped with the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress a peak of sound in a specific frequency band. <P>SOLUTION: Provided is a structure 100 of fixing a stator 23 in which a plurality of split cores 26 each having a tooth portion 26a used to wind an electric wire are circularly wound and a rotatable rotor is disposed in the inside thereof, and a cylindrical casing 11 disposed around the stator 23. The plurality of split cores 26 are different in contact state from each other by being different in a fixed region 26c by welding between the outer circumferential surface 26b and the inner circumferential surface 11b of the casing 11. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a fixing structure between a stator and a casing and a compressor including the same.

As for the stator of the motor used for a compressor etc., the thing by which several division | segmentation cores are arranged in the circumferential direction, and is comprised by the annular shape as a whole is common. The stator is disposed in a cylindrical casing disposed around the stator, and is fixed to the inner peripheral surface of the casing by a method such as shrink fitting (for example, see Patent Document 1).
JP 2003-88013 A

  Here, each divided core which comprises a stator is comprised by the same shape by laminating | stacking the plate-shaped member of the same shape stamped out from the steel plate. For this reason, when the stator in which a plurality of divided cores are annularly arranged and the cylindrical casing arranged around the stator are fixed by shrinkage fitting, the outer peripheral surface of the split core and the inner peripheral surface of the casing The contact state may be the same in all the split cores. Therefore, the outer peripheral surface of each divided core is uniformly tightened from the inner peripheral surface of the casing over the entire circumference, so that the stress generated inside each divided core is substantially the same in all the divided cores. Therefore, the rigidity and natural frequency of each divided core are all the same, and the peak (protrusion) of the sound in a specific frequency band appears prominently due to the vibration transmitted from the divided core to the casing, causing noise. There's a problem.

  Therefore, the present invention has been made to solve the above-described problems, and fixing of a stator and a casing capable of suppressing the appearance of a sound peak (protrusion) in a specific frequency band. An object is to provide a structure and a compressor including the structure.

  According to a first aspect of the present invention, there is provided a stator in which a plurality of divided cores each having a tooth portion for winding an electric wire are arranged in an annular shape, and a rotatable rotor is disposed on the inner side of the stator. A fixed structure with a cylindrical casing arranged around the child, wherein the contact state between the outer peripheral surface of at least one split core of the plurality of split cores and the inner peripheral surface of the casing is another split core. The contact state between the outer peripheral surface of the casing and the inner peripheral surface of the casing is different.

  In this fixed structure, the contact state between the outer peripheral surface of at least one split core and the inner peripheral surface of the casing is different from the contact state between the outer peripheral surface of the other split core and the inner peripheral surface of the casing. Therefore, the stress generated inside at least one split core is not the same as that of other split cores. Accordingly, the rigidity and natural frequency of at least one divided core are not the same as the rigidity and natural frequency of the other divided cores, and it is possible to suppress the appearance of a sound peak (protrusion) in a specific frequency band. .

  Here, the “contact state between the outer peripheral surface of the split core and the inner peripheral surface of the casing” means, for example, a state where the outer peripheral surface of the split core is not in contact with the inner peripheral surface of the casing, Is in contact with the inner peripheral surface of the casing but not fixed, and the outer peripheral surface of the split core is in contact with and fixed to the inner peripheral surface of the casing.

  And in the state where the outer peripheral surface of the split core and the inner peripheral surface of the casing are in contact, "the contact state between the outer peripheral surface of the split core and the inner peripheral surface of the casing" is different from the outer peripheral surface of the split core. A state in which the contact area with the inner peripheral surface of the casing, the contact position, the contact strength, and the like are different.

  The fixing structure according to a second aspect of the present invention is the fixing structure according to the first aspect of the present invention, wherein the plurality of divided cores are divided cores whose outer peripheral surfaces are fixed to the inner peripheral surface of the casing by welding. The outer peripheral surface includes a split core that is not fixed to the inner peripheral surface of the casing by welding.

  In this fixing structure, the contact state between the outer peripheral surface of each divided core and the inner peripheral surface of the casing differs depending on whether or not the outer peripheral surface of each divided core is fixed to the inner peripheral surface of the casing by welding. In other words, the split core whose outer peripheral surface is fixed to the inner peripheral surface of the casing by welding generates stress due to welding, and the outer peripheral surface is not fixed to the inner peripheral surface of the casing by welding. No stress due to welding occurs inside the core. As a result, the stress generated in each divided core changes, so that the natural frequency of each divided core becomes different.

  Here, “stress generated inside the split core fixed by welding” means, for example, stress generated when the split core deforms due to heat input during welding, and the casing deforms due to heat input during welding. Stress that affects the split core, and stress that occurs when the split core deforms due to the thermal contraction of the melted portion between the outer peripheral surface of the split core and the inner peripheral surface of the casing after welding. And the sum of stresses resulting from the respective deformations of the casing.

  A fixing structure according to a third aspect of the present invention is the fixing structure according to the first or second aspect of the present invention, wherein the plurality of divided cores are in a predetermined fixing region on the outer peripheral surface with respect to the inner peripheral surface of the casing. It includes a split core fixed by welding and a split core fixed by welding to the inner peripheral surface of the casing in a fixed region different from the predetermined fixed region on the outer peripheral surface thereof.

  In this fixed structure, the stress generated in each split core changes due to the different fixed areas fixed by welding between the outer peripheral surface of each split core and the inner peripheral surface of the casing. The numbers will be different.

  Here, “the outer peripheral surface of the split core and the inner peripheral surface of the casing are fixed by welding in different fixing regions” means that welding for fixing the outer peripheral surface of the split core and the inner peripheral surface of the casing is performed. This means a state in which any one of the shape, number, and position (height) of the fixed regions is different.

  A fixing structure according to a fourth aspect of the present invention is the fixing structure according to the second or third aspect of the present invention, wherein at least a part of the inner peripheral surface of the casing that is not fixed to the outer peripheral surfaces of the plurality of split cores by welding. Is characterized in that convex portions are formed in contact with the outer peripheral surfaces of the plurality of split cores.

  In this fixed structure, the contact state between the outer peripheral surface of each split core and the inner peripheral surface of the casing varies depending on whether or not the convex portion formed on the inner peripheral surface of the casing contacts the outer peripheral surface of the split core. Therefore, since the stress generated in each divided core changes, the natural frequency of each divided core becomes different.

  A fixing structure according to a fifth invention is the fixing structure according to the second or third invention, wherein the plurality of split cores are fixed to the casing by an interference fit.

  In this fixed structure, in addition to the stress due to welding, stress due to interference fit is generated inside each split core. Here, the stress due to the interference fit is almost the same in all the divided cores. Therefore, since the stress due to welding is different in each divided core, the natural frequency of each divided core is different.

  A fixing structure according to a sixth aspect of the present invention is the fixing structure according to the fifth aspect of the present invention, wherein at least a part of a region where the outer peripheral surfaces of the plurality of split cores are fixed by an interference fit on the inner peripheral surface of the casing. Is characterized in that a recess is formed.

  In this fixing structure, when the split core is fixed to the casing by welding and interference fitting, a recess is formed in a part of the inner peripheral surface of the casing, so that the outer peripheral surface of each split core and the casing The contact area with the inner peripheral surface is different. Therefore, since the stress generated in each divided core changes, the natural frequency of each divided core becomes different.

  A fixing structure according to a seventh aspect is the fixing structure according to the first aspect, wherein at least a part of a region where the outer peripheral surfaces of the plurality of split cores are fixed on the inner peripheral surface of the casing has a recess. The plurality of divided cores are fixed to the casing by an interference fit.

  In this fixing structure, when the split core is fixed to the casing by an interference fit, the outer peripheral surface of the split core and the inner peripheral surface of the casing are in contact over the entire periphery. Therefore, the recessed area is formed in a part of the inner peripheral surface of the casing, so that the contact area between the outer peripheral surface of each divided core and the inner peripheral surface of the casing is different. Thereby, since the stress generated inside each divided core changes, the natural frequency of each divided core becomes different.

  A compressor according to an eighth invention is characterized by including the fixing structure according to any one of the first to seventh inventions.

  In this compressor, it is possible to suppress the appearance of a sound peak (protrusion) in a specific frequency band.

  As described above, according to the present invention, the following effects can be obtained.

  In the first invention, the contact state between the outer peripheral surface of at least one split core and the inner peripheral surface of the casing is different from the contact state between the outer peripheral surface of the other split core and the inner peripheral surface of the casing. Therefore, the stress generated inside at least one split core is not the same as that of other split cores. Accordingly, the rigidity and natural frequency of at least one divided core are not the same as the rigidity and natural frequency of the other divided cores, and it is possible to suppress the appearance of a sound peak (protrusion) in a specific frequency band. .

  In the second invention, the contact state between the outer peripheral surface of each divided core and the inner peripheral surface of the casing differs depending on whether or not the outer peripheral surface of each divided core is fixed to the inner peripheral surface of the casing by welding. In other words, the split core whose outer peripheral surface is fixed to the inner peripheral surface of the casing by welding generates stress due to welding, and the outer peripheral surface is not fixed to the inner peripheral surface of the casing by welding. No stress due to welding occurs inside the core. As a result, the stress generated in each divided core changes, so that the natural frequency of each divided core becomes different.

  In the third aspect of the invention, the stress generated in each divided core changes due to the different fixed regions fixed by welding between the outer peripheral surface of each divided core and the inner peripheral surface of the casing. The frequency becomes different.

  In 4th invention, the contact state of the outer peripheral surface of each split core and the inner peripheral surface of a casing changes with whether the convex part formed in the inner peripheral surface of a casing contacts the outer peripheral surface of a split core. . Therefore, since the stress generated in each divided core changes, the natural frequency of each divided core becomes different.

  In the fifth invention, in addition to the stress caused by welding, the stress caused by the interference fit is generated inside each divided core. Here, the stress due to the interference fit is almost the same in all the divided cores. Therefore, since the stress due to welding is different in each divided core, the natural frequency of each divided core is different.

  In 6th invention, when a division | segmentation core is fixed with respect to a casing by welding and interference fitting, since the recessed part is formed in a part of inner peripheral surface of a casing, the outer peripheral surface and casing of each division | segmentation core The contact area with the inner peripheral surface of is different. Therefore, since the stress generated in each divided core changes, the natural frequency of each divided core becomes different.

  In 7th invention, if a division | segmentation core is fixed with an interference fit with respect to a casing, the outer peripheral surface of a division | segmentation core and the inner peripheral surface of a casing will contact over the perimeter. Therefore, the recessed area is formed in a part of the inner peripheral surface of the casing, so that the contact area between the outer peripheral surface of each divided core and the inner peripheral surface of the casing differs. Thereby, since the stress generated inside each divided core changes, the natural frequency of each divided core becomes different.

  In the eighth invention, it is possible to suppress the appearance of a peak (protrusion) of a sound in a specific frequency band.

  Hereinafter, based on the drawings, a compressor provided with a fixing structure according to an embodiment of the present invention will be described.

(First embodiment)
FIG. 1 is a schematic configuration diagram of a rotary compressor according to a first embodiment of the present invention, and FIG. 2 is a cross-sectional view illustrating a drive mechanism of the rotary compressor of FIG. The rotary compressor 1 compresses a compressed refrigerant from which moisture introduced from an accumulator (not shown) is removed, and discharges the compressed refrigerant from a discharge passage 25 disposed at the upper end portion thereof. .

  As illustrated in FIG. 1, the rotary compressor 1 includes a sealed casing 10, a drive mechanism 20 disposed in the sealed casing 10, and a compression mechanism 30. The rotary compressor 1 is a so-called high-pressure dome type compressor, and a compression mechanism 30 is disposed on the bottom 13 side of the drive mechanism 20 in the hermetic casing 10. In addition, lubricating oil 40 supplied to each sliding portion of the compression mechanism 30 is stored in the lower portion of the hermetic casing 10.

  The sealed casing 10 includes a casing 11, a top 12, and a bottom 13. The casing 11 is a cylindrical member extending in the up-and-down direction, and has upper and lower ends opened, and is disposed around a stator 23 described later. In addition, an inlet 14 for introducing a compressed refrigerant from an accumulator (not shown) is formed in the lower right end portion of the side surface of the casing 11. The top 12 is a member that closes the opening at the upper end of the casing 11, and is provided with the above-described discharge flow path 25. The bottom 13 is a member that closes the opening at the lower end of the casing 11. The sealed casing 11 is formed with a sealed space 16 surrounded by the casing 11, the top 12 and the bottom 13.

  The drive mechanism 20 is provided to drive the compression mechanism 30 and includes a motor 21 serving as a drive source and a motor shaft 24 attached to the motor 21.

  The motor 21 includes a rotor 22 and a stator 23 that is disposed on the radially outer side of the rotor 22 via an air gap (not shown).

  As shown in FIG. 2, the rotor 22 has a plurality of permanent magnets 52 arranged on the outer periphery of a laminated iron core 51 made of laminated electromagnetic steel sheets. In the laminated core 51, a plurality of rotor cores, which are thin plates made of a metal material, are laminated to each other, and the plurality of rotor cores are joined to each other by welding, rivets (not shown), caulking (not shown), or the like. It is formed by. In the laminated iron core 51, a substantially circular through hole 57 is formed at a substantially central portion in plan view. The motor shaft 24 is inserted into the through hole 57, and the motor shaft 24 is fixed to the laminated iron core 51. The plurality of permanent magnets 52 have a substantially rectangular parallelepiped shape, and are composed of, for example, a rare earth magnet (neodymium-iron-boron) having a relatively large magnetic force. The plurality of permanent magnets 52 are embedded in the laminated iron core 51 so as not to be separated by centrifugal force. And the part in which the some permanent magnet of the laminated iron core 51 is arrange | positioned is magnetized by the north-pole or the south pole.

  The stator 23 is configured by winding an electric wire 27 around a plurality of divided cores 26 arranged in an annular shape. The plurality of divided cores 26 are thin plates made of a metal material, and a plurality of plate-like members 43 having the same shape are laminated on each other, and all the divided cores 26 are configured in the same shape. The plurality of plate-like members 43 constituting the split core 26 are joined to each other by welding, caulking, or the like. Each of the plurality of plate-like members 43 has one tooth portion 26 a for winding the electric wire 27. A rotatable rotor 22 is disposed inside the plurality of split cores 26. A cylindrical casing 11 is disposed outside the plurality of split cores 26. The outer peripheral surfaces 26b of the plurality of split cores 26 are fixed to the inner peripheral surface of the casing 11 by fixing regions 26c by welding. A structure for fixing the outer peripheral surface 26b of the plurality of divided cores 26 and the inner peripheral surface 11b of the casing 11 will be described later. The plurality of divided cores 26 may not be connected to each other, or may be connected with a thin wall.

  The motor shaft 24 rotates with the rotor 22 described above to rotate the roller 34 of the compression mechanism 30. The motor shaft 24 is provided with an eccentric portion 22a so as to be positioned in a cylinder chamber B1 of a cylinder 33 which will be described later. The rollers 34 are respectively attached to the eccentric portions 22a. Thereby, with the rotation of the motor shaft 24, the roller 34 attached to the eccentric portion 22a rotates in the cylinder chamber B1.

  And in order to drive the drive mechanism 20, the alternating voltage from which the phase shifted | deviated by predetermined amount is applied to the electric wire 27 wound around the tooth | gear part 26a of the some split core 26. FIG. Although the magnetic field according to the applied voltage generate | occur | produces in the electric wire 27, the direction of a magnetic field changes with the change of the phase of alternating voltage. As a result, a clockwise rotating magnetic field is generated in the through hole 44 in a plan view. The rotor 22 is rotated by the magnetic force generated by the rotating magnetic field and the magnetic field of the permanent magnet 52. As the rotor 22 rotates, the motor shaft 24 fixed to the rotor 22 also rotates.

  On the other hand, the compression mechanism 30 is provided to compress and discharge the refrigerant sucked from the accumulator. The refrigerant discharged by the compression mechanism 30 passes through the air gap between the stator 23 and the rotor 22 of the drive mechanism 20, cools the drive mechanism 20, and then is discharged from the discharge flow path 25. The compression mechanism 30 includes a front muffler 31, a front head 32, a cylinder 33, and a rear head 35 from the top 12 side toward the bottom 13 side along the rotation axis of the motor shaft 24 of the drive mechanism 20. ing.

  The front muffler 31 is attached so as to form a muffler space A1 between the front muffler 32 and the front muffler 31 so as to reduce noise associated with refrigerant discharge. The front muffler 31 has an opening 31a into which the front head 32 is inserted, and has a flange 31b to be sealed with the front head 32. The front muffler 31 has a discharge hole (not shown) through which the refrigerant compressed from the muffler space A1 is discharged.

  The front head 32 is disposed on the top 12 side of the cylinder 33 and closes the opening on the top 12 side of the cylinder chamber B <b> 1 of the cylinder 33. The front head 32 has a bearing hole 32a into which the motor shaft 24 is inserted. The front head 32 has a concave valve housing chamber (not shown) opened on the top 12 side, and a discharge port (see FIG. 2) through which the refrigerant compressed by the rotational drive of the roller 34 in the cylinder chamber B1 of the cylinder 33 is discharged. (Not shown). The refrigerant discharged from the discharge port is discharged from a discharge hole formed in the front muffler 31 through the above-described muffler space A1. Further, a discharge valve (not shown) that opens and closes the outlet of the discharge port and a pressing member (not shown) that restricts the opening of the discharge valve are provided in the valve storage chamber.

  The cylinder 33 is provided with a cylinder chamber B1 in which a roller 34 that moves eccentrically with the rotation of the motor shaft 24 is disposed. The cylinder chamber B1 and the muffler space A1 are communicated with each other through the above-described discharge port. Therefore, the refrigerant compressed by the eccentric motion of the roller 34 attached to the eccentric portion 22a of the motor shaft 24 is guided from the cylinder chamber B1 to the muffler space A1 through the discharge port.

  The rear head 35 is disposed on the bottom 13 side of the cylinder 33 and closes the opening on the bottom 13 side of the cylinder chamber B <b> 1 of the cylinder 33. Further, the rear head 35 is formed with a substantially circular bearing hole 35a in a substantially central portion in plan view, and the motor shaft 24 passes through the bearing hole 35a.

  Next, the above-described fixing structure between the stator and the casing will be described with reference to FIGS. 3 and 4. FIG. 3 is an external perspective view illustrating a fixing structure between the stator and the casing in the rotary compressor according to the first embodiment of the present invention. 4 is a cross-sectional view of the rotary compressor taken along line AA in FIG.

  In the fixing structure 100 between the stator 23 and the casing 11, the outer peripheral surfaces 26 b of the plurality of split cores 26 are fixed to the inner peripheral surface 11 b of the casing 11 by welding. Accordingly, in each split core 26, stress generated by deformation of the split core due to heat input during welding, stress that affects the split core due to deformation of the casing due to heat input during welding, and welding Stress caused by deformation of the split core and casing, such as stress generated when the split core deforms due to the molten portion of the outer peripheral surface of the split core and the inner peripheral surface of the casing being cooled and thermally shrinking later. is doing. And as shown in FIG. 4, the clearance gap is formed in the part which is not being fixed by welding between each outer peripheral surface 26b of the some split core 26, and the inner peripheral surface 11b of the casing 11. As shown in FIG.

  Here, for example, when considering two divided cores 26 including a divided core 26A included in the plurality of divided cores 26 and a divided core 26B adjacent to the divided core 26A, the outer peripheral surface 26b ′ of the divided core 26A and the casing 11 The fixed region 26c ′ by welding with the inner peripheral surface 11b is the fixed region 26c ″ by welding between the outer peripheral surface 26b ″ of the split core 26B and the inner peripheral surface 11b of the casing 11, and the shape, number, Or the position (height) is different. That is, as shown in FIGS. 3 and 4, the number of fixed regions 26c ′ on the outer peripheral surface 26b ′ of the split core 26A is three, whereas the fixed region 26c ′ on the outer peripheral surface 26b ″ of the split core 26B is three. The number of 'is two. Further, the shapes (sizes) of the three fixed regions 26c ′ on the outer peripheral surface 26b ′ of the split core 26A are smaller than the shapes of the two fixed regions 26c ″ on the outer peripheral surface 26b ″ of the split core 26B. . Further, the fixed region 26c 'on the outer peripheral surface 26b' of the split core 26A and the fixed region 26c "on the outer peripheral surface 26b" of the split core 26B have different positions in the height direction. Therefore, the contact state between the outer peripheral surface 26b 'of the split core 26A and the inner peripheral surface 11b of the casing 11 is different from the contact state between the outer peripheral surface 26b "of the split core 26B and the inner peripheral surface 11b of the casing 11. At this time, the stress generated in each of the split core 26A and the split core 26B is different, and the plurality of plate-like members 43A constituting the split core 26A and the plurality of plate-like members 43B constituting the split core 26B are different. Each fastening strength changes. As a result, the rigidity of each of the split core 26A and the split core 26B changes, and the natural frequency of the split core 26A and the natural frequency of the split core 26B become different.

  As described above, when the contact state is different in all of the plurality of divided cores 26 so that the stress generated in each of the divided core 26A and the divided core 26B is different, the stress generated in the plurality of divided cores 26 is increased. Different from each other, the natural frequency of the divided core 26A is different in all the divided cores.

[Features of the fixing structure of the first embodiment]
The fixing structure 100 of the first embodiment has the following characteristics.

  In the fixing structure 100 of the present embodiment, the stress generated in each of the plurality of divided cores 26 is different because the fixing region 26c by welding is different in all of the plurality of divided cores 26, and the natural frequency of the divided core 26A is , All the split cores will be different. For this reason, it is possible to suppress the appearance of a peak (protrusion) of a sound in a specific frequency band.

  Further, in all the divided cores 26, the fixed region 26 c fixed by welding of the outer peripheral surface 26 b of each divided core 26 and the inner peripheral surface 11 b of the casing 11 is made different so that the natural vibration of each divided core 26 is obtained. The numbers will be different.

(Second Embodiment)
FIG. 5 is an external perspective view illustrating a fixing structure between the stator and the casing in the rotary compressor according to the second embodiment of the present invention. 6 is a cross-sectional view taken along line BB in FIG. In the second embodiment, the outer peripheral surfaces of the plurality of divided cores are fixed to the inner peripheral surface of the casing by welding and interference fitting, and the outer peripheral surfaces of the plurality of divided cores are fixed to the inner peripheral surface of the casing. Different from the first embodiment, which is fixed only by welding. In addition, in 2nd Embodiment, since it is the same as that of 1st Embodiment except the fixed state with respect to the casing of the outer peripheral surface in a some division | segmentation core, the same number as 1st Embodiment is attached | subjected and the description is abbreviate | omitted. .

  In the fixing structure 200 of the stator 23 and the casing 11, the outer peripheral surfaces 26 b of the plurality of split cores 26 constituting the stator 23 are fixed to the inner peripheral surface of the cylindrical casing 11 by an interference fit and welding. ing. Therefore, in each divided core 26, the casing is deformed by compressive stress generated by tightening at the time of interference fitting, stress generated by deformation of the divided core due to heat input during welding, and heat input during welding. Split cores and casings, such as stresses that affect split cores, and stresses generated by deformation of split cores caused by cooling and thermal contraction of the melted part between the outer peripheral surface of split cores and the inner peripheral surface of casing after welding The stress resulting from each deformation | transformation has generate | occur | produced. And as shown in FIG. 6, each outer peripheral surface 26b of the some split core 26 and the inner peripheral surface 11b of the casing 11 are welded by the fixed area | region 226c. In addition, a portion that is not fixed by welding is in close contact between the outer peripheral surface 26 b of each of the plurality of split cores 26 and the inner peripheral surface 11 b of the casing 11.

  Here, when considering two divided cores 26 including a divided core 26A included in the plurality of divided cores 26 and a divided core 26B adjacent to the divided core 26A, the outer peripheral surface 26b ′ of the divided core 26A and the inner periphery of the casing 11 are considered. Whereas the surface 11b is fixed only by an interference fit, the outer peripheral surface 26b '' of the split core 26B and the inner peripheral surface 11b of the casing 11 are fixed by an interference fit and welding. That is, as shown in FIGS. 5 and 6, there is no fixed region 26 c by welding between the contact surfaces of the outer peripheral surface 26 b ′ of the split core 26 A and the inner peripheral surface 11 b of the casing 11, whereas the split core 26 B A fixing region 26c '' by welding is provided between the contact surfaces of the outer peripheral surface 26b '' and the inner peripheral surface 11b of the casing 11. Therefore, the contact state between the outer peripheral surface 26b ′ of the split core 26A and the inner peripheral surface 11b of the casing 11 and the contact state between the outer peripheral surface 26b ″ of the split core 26B and the inner peripheral surface 11b of the casing 11 are different. Only the stress due to the interference fit is generated inside the split core 26A, whereas the stress due to the interference fit and welding is generated inside the split core 26B. At this time, the stress generated in each of the split core 26A and the split core 26B is different, and the plurality of plate-like members 43A constituting the split core 26A and the plurality of plate-like members 43B constituting the split core 26B are different. Each fastening strength changes. As a result, the rigidity of each of the split core 26A and the split core 26B changes, and the natural frequency of the split core 26A and the natural frequency of the split core 26B become different.

  As described above, when the contact state is different in all of the plurality of divided cores 26 so that the stress generated in each of the divided core 26A and the divided core 26B is different, the stress generated in the plurality of divided cores 26 is increased. Different from each other, the natural frequency of the divided core 26A is different in all the divided cores.

[Features of the fixing structure of the second embodiment]
The fixing structure 200 of the second embodiment has the following characteristics.

  In the fixed structure 200 of the second embodiment, the natural frequencies of the divided cores 26 are different as in the first embodiment. For this reason, it is possible to suppress the appearance of a peak (protrusion) of a sound in a specific frequency band.

(Third embodiment)
FIG. 7 is a cross-sectional view illustrating a fixing structure between a stator and a casing of a rotary compressor according to the third embodiment of the present invention. FIG. 8 is an external perspective view of the casing of FIG. In the third embodiment, the outer peripheral surfaces of the plurality of split cores and the inner peripheral surface of the casing are fixed only by interference fit, and the outer peripheral surfaces of the plurality of split cores and the inner peripheral surface of the casing are fixed by welding. This is different from the first embodiment. In addition, in 3rd Embodiment, since it is the same as that of 1st Embodiment except the fixed state with respect to the casing of the outer peripheral surface in a some division | segmentation core, the same number as 1st Embodiment is attached | subjected and the description is abbreviate | omitted. .

  In the fixing structure 300 between the stator 23 and the casing 311, the outer peripheral surfaces 26 b of the plurality of split cores 26 constituting the stator 23 are fixed to the inner peripheral surface 311 b of the cylindrical casing 311 by an interference fit. Has been. Therefore, a stress due to an interference fit is generated in each divided core 26. And as shown in FIG. 7, the outer peripheral surface 26b of the some split core 26 and the inner peripheral surface 311b of the casing 311 are closely_contact | adhered over the perimeter. Further, as shown in FIG. 8, a plurality of recesses 311 c are formed in a region where the outer peripheral surface 26 b of the plurality of split cores 26 is fixed on the inner peripheral surface 311 b of the casing 311. Therefore, a space is formed by the recess 311 c between the outer peripheral surface 26 b of each of the plurality of split cores 26 and the inner peripheral surface 311 b of the casing 311.

  Here, when considering two split cores 26, which are a split core 26A included in a plurality of split cores 26 and a split core 26B adjacent to the split core 26A, as shown in FIG. 7 and FIG. On the peripheral surface 311b, the shape of the recess 311c ′ formed in the region where the outer peripheral surface 26b ′ of the split core 26A is fixed, and the recess 311c ′ formed in the region where the outer peripheral surface 26b ″ of the split core 26B is fixed. The shape is different. Therefore, when each split core 26 is fixed to the casing 311 by an interference fit, the outer peripheral surface 26b ′ of the split core 26A and the outer peripheral surface 26b ″ of the split core 26B are respectively connected to the inner peripheral surface 311b of the casing 311. Since the recess 311c ′ and the recess 311c ″ formed in the casing 311b are in close contact with each other without any gap, the contact between the outer peripheral surface 26b ′ of the split core 26A and the inner peripheral surface 311b of the casing 311 is different. The region is different from the contact region between the outer peripheral surface 26b ″ of the split core 26B and the inner peripheral surface 311b of the casing 311. At this time, the stress generated inside each of the split core 26A and the split core 26B is different, and the plurality of plate-like members 43A constituting the split core 26A and the plurality of plate-like members 43B constituting the split core 26B are different. Each fastening strength changes. As a result, the rigidity of each of the split core 26A and the split core 26B changes, and the natural frequency of the split core 26A and the natural frequency of the split core 26B become different.

  As described above, when the contact state is different in all of the plurality of divided cores 26 so that the stress generated in each of the divided core 26A and the divided core 26B is different, the stress generated in the plurality of divided cores 26 is increased. Different from each other, the natural frequency of the divided core 26A is different in all the divided cores.

[Features of the fixing structure of the third embodiment]
The fixing structure 300 of the third embodiment has the following characteristics.

  In the fixing structure 300 of the third embodiment, the natural frequencies of the divided cores 26 are different as in the first embodiment. For this reason, it is possible to suppress the appearance of a peak (protrusion) of a sound in a specific frequency band.

  In the above embodiment, not only the stress generated in each split core is different due to the presence or absence of welding of the split core and the pipe, or the presence or absence of unevenness of the casing, but also the contact state is different. Since the path of the sound transmitted from the divided core is different, the transmission characteristics of the sound transmitted from the divided core to the casing are different. For example, if the vibration node portion of the vibration mode of the natural frequency of the split core is brought into contact with or fixed to the casing, sound transmission from the split core to the casing can be suppressed.

  As mentioned above, although embodiment of this invention was described based on drawing, it should be thought that a specific structure is not limited to these embodiment. The scope of the present invention is shown not only by the above description of the embodiments but also by the scope of claims for patent, and further includes all modifications within the meaning and scope equivalent to the scope of claims for patent.

  For example, in the above-described embodiment, the example in which the fixing structures 100, 200, and 300 of the plurality of divided cores 26 and the casings 11 and 311 are applied to the rotary compressor 1 has been described. It is applicable to other compressors.

  In the above-described embodiment, each of the plurality of plate-like members 43 has one tooth portion 26a for winding the electric wire 27. However, the present invention is not limited to this, and two or more tooth portions 26a are wound. You may have a tooth | gear part.

  Further, in the first embodiment described above, the example in which the inner peripheral surface 11b of the casing 11 is formed to be a uniform surface has been described. However, the present invention is not limited thereto, and as illustrated in FIGS. 9 and 10, On the inner peripheral surface 411b of the casing 411, even if a convex portion 411c that contacts the outer peripheral surface 26b of the plurality of divided cores is formed in at least a part of the region that is not fixed to the outer peripheral surface 26b of the plurality of divided cores 26 by welding. Good. In this case, the convex portion 411c formed on the inner peripheral surface 411b of the casing 411 contacts the outer peripheral surface 26b of the split core 26, so that the outer peripheral surface 26b of each split core 26 and the inner peripheral surface 411b of the casing 411 The contact state changes.

  Moreover, in the above-mentioned embodiment, although each contact state of the outer peripheral surface 26b of the some split core 26 and the inner peripheral surfaces 11b and 311b of the casings 11 and 311 demonstrated the example different in all the split cores 26, The present invention is not limited to this, and may be different in at least one divided core.

  Further, in the above-described third embodiment, the example in which the plurality of split cores 26 are formed with the recesses on the inner peripheral surface 311b of the casing 311 when being fixed only by interference fitting has been described. However, the inner peripheral surface 311b of the casing 311 may be formed with a recess when it is fixed by interference fit and welding.

  By using the present invention, it is possible to suppress the appearance of a sound peak (protrusion) in a specific frequency band.

It is a schematic block diagram of the rotary compressor which concerns on 1st Embodiment of this invention. It is sectional drawing explaining the drive mechanism of the rotary compressor of FIG. It is an external appearance perspective view explaining the fixing structure of the stator and casing in the rotary compressor of FIG. FIG. 4 is a cross-sectional view taken along line AA in FIG. 3. It is an external appearance perspective view explaining the fixing structure of the stator and casing in the rotary compressor which concerns on 2nd Embodiment of this invention. It is sectional drawing in the BB line of FIG. It is sectional drawing explaining the fixing structure of the stator and casing of the rotary compressor which concerns on 3rd Embodiment of this invention. It is an external appearance perspective view of the casing of FIG. It is sectional drawing explaining the fixing structure of the stator and casing of the rotary compressor which concerns on the modification of this invention. It is an external appearance perspective view of the casing of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Rotary compressor 11, 311 Casing 11b, 311b, 411b Casing inner peripheral surface 22 Rotor 23 Stator 26 Split core 26a Tooth part 26b Outer peripheral surface of split core 26c, 226c Fixed area 27 Electric wire 100, 200, 300, 400 Fixed structure 311c Concave part 411c Convex part

Claims (8)

A stator in which a plurality of divided cores each having a tooth portion for winding an electric wire are arranged in an annular shape and a rotatable rotor is arranged inside thereof, and a cylindrical shape arranged around the stator A fixing structure with the casing,
The contact state between the outer peripheral surface of at least one split core of the plurality of split cores and the inner peripheral surface of the casing is different from the contact state between the outer peripheral surface of the other split core and the inner peripheral surface of the casing. Characteristic fixed structure of stator and casing. The plurality of divided cores are:
A split core whose outer peripheral surface is fixed to the inner peripheral surface of the casing by welding;
The stator and casing fixing structure according to claim 1, wherein the outer peripheral surface includes a split core that is not fixed to the inner peripheral surface of the casing by welding. The plurality of divided cores are:
A split core fixed by welding to the inner peripheral surface of the casing in a predetermined fixing region on the outer peripheral surface;
The stator according to claim 1, further comprising: a split core fixed by welding to the inner peripheral surface of the casing in a fixed region different from the predetermined fixed region on the outer peripheral surface. Fixed structure with casing.   A convex portion that contacts the outer peripheral surface of the plurality of divided cores is formed in at least a part of an area that is not fixed to the outer peripheral surface of the plurality of divided cores by welding on the inner peripheral surface of the casing. The fixing structure between the stator and the casing according to claim 2 or 3.   The stator-casing fixing structure according to claim 2 or 3, wherein the plurality of divided cores are fixed to the casing by an interference fit.   The stator and casing according to claim 5, wherein a recess is formed in at least a part of a region where the outer peripheral surfaces of the plurality of split cores are fixed by interference fitting on the inner peripheral surface of the casing. Fixed structure with. A recess is formed in at least a part of a region where the outer peripheral surfaces of the plurality of split cores are fixed on the inner peripheral surface of the casing,
The stator-casing fixing structure according to claim 1, wherein the plurality of divided cores are fixed to the casing by an interference fit. The compressor provided with the fixing structure of the stator and casing of any one of Claims 1-7.

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