JP2012120365A - Rotor, motor and compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotor where centrifugal force of a balance weight does not need to be received by a plurality of rivets so that magnetic flux leakage through the plurality of rivets can be prevented.SOLUTION: An end plate 34 positioned at an end face in the axial direction of a rotor core 31 has a constraint surface 341 constraining the circumference surface of a balance weight 37. Therefore, centrifugal force loaded to the balance weight 37 by rotation of the rotor core 31 can be received on the constraint surface 341 of the end plate 34.

Description

  The present invention relates to a rotor, a motor, and a compressor.

  Conventionally, a rotor includes a rotor core, end plates positioned on both end surfaces in the axial direction of the rotor core, and balance weights positioned on the end plates (Japanese Patent Laid-Open No. 2009-225639: Patent). Reference 1).

  The balance weight was attached to the rotor core by a plurality of rivets. That is, the centrifugal force applied to the balance weight by the rotation of the rotor core is held by a plurality of rivets. Here, in general, the position of the rivet relative to the rotor core is restricted by the position of the magnet embedded in the rotor core.

  However, in the conventional rotor, since the centrifugal force of the balance weight is held by a plurality of rivets, there are many restrictions on the positions of the plurality of rivets relative to the rotor core, and there are many restrictions on the shape of the balance weight. There was a problem. Further, since the balance weight is held by a plurality of rivets, there is a problem that magnetic flux leaks through the plurality of rivets when the balance weight is formed of a magnetic material.

JP 2009-225639 A

  Accordingly, an object of the present invention is to provide a rotor that does not require holding the centrifugal force of the balance weight with a plurality of rivets, and that can prevent magnetic flux leakage through the plurality of rivets, It is providing the motor which has this rotor, and the compressor which has this motor.

In order to solve the above problems, the rotor of the present invention is:
Rotor core,
End plates located on both axial end faces of the rotor core;
A balance weight attached to the end plate,
The end plate has a constraining surface that constrains at least one of an outer peripheral surface, an inner peripheral surface, and a side surface of the balance weight.

  According to the rotor of the present invention, the end plate has a constraining surface that constrains at least one of the outer peripheral surface, the inner peripheral surface, and the side surface of the balance weight, and is thus loaded on the balance weight by the rotation of the rotor core. Centrifugal force can be received by the constraining surface of the end plate.

  For this reason, it is not necessary to hold the centrifugal force of the balance weight with a plurality of rivets, and an inexpensive balance weight with less shape restrictions can be used. Moreover, even if the balance weight is formed of a magnetic material, it is not necessary to hold the balance weight with a plurality of rivets, and thus magnetic flux leakage through the plurality of rivets can be prevented.

  In one embodiment of the rotor, the end plate has a constraining surface that constrains the outer peripheral surface of the balance weight.

  According to the rotor of this embodiment, the end plate has a constraining surface that constrains the outer peripheral surface of the balance weight, so that the centrifugal force of the balance weight can be more reliably held by the constraining surface of the end plate.

In the rotor of one embodiment,
The restraint surface is the outer peripheral surface of the fitting groove,
The fitting groove is formed so as to correspond to the shape of the balance weight, and the balance weight is fitted therein.

  According to the rotor of this embodiment, the fitting groove includes the restraining surface and is formed so as to correspond to the shape of the balance weight, and the balance weight is fitted. No need for rivets to hold power.

In the rotor of one embodiment,
The restraint surface is the outer peripheral surface of the fitting groove,
The fitting groove is formed in an annular shape around the axis of the rotor core.

  According to the rotor of this embodiment, since the fitting groove includes the restraining surface and is formed in an annular shape around the axis of the rotor core, the fitting groove can be easily formed.

The motor of the present invention
The rotor,
And a stator arranged so as to surround the outer peripheral side of the rotor.

  According to the motor of the present invention, since the rotor is provided, an inexpensive and highly reliable motor can be provided.

The compressor of the present invention is
A sealed container;
A compression element disposed in the sealed container;
It is provided with the said motor which drives the said compression element via a rotating shaft while arrange | positioning in the said airtight container.

  According to the compressor of this invention, since the motor is provided, an inexpensive and highly reliable compressor can be provided.

  According to the rotor of the present invention, the end plate has a constraining surface that constrains the outer peripheral surface of the balance weight, so there is no need to hold the centrifugal force of the balance weight with a plurality of rivets, and the plurality of rivets It is possible to prevent leakage of magnetic flux through the.

  According to the motor of the present invention, since the rotor is provided, an inexpensive and highly reliable motor can be provided.

  According to the compressor of this invention, since the motor is provided, an inexpensive and highly reliable compressor can be provided.

It is a longitudinal section showing a 1st embodiment of a compressor using a rotor of the present invention. It is sectional drawing of a rotor. It is a top view of a rotor. It is a top view which shows 2nd Embodiment of the rotor of this invention.

  Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments.

(First embodiment)
FIG. 1 is a longitudinal sectional view showing a first embodiment of a compressor using the rotor of the present invention. The compressor includes a sealed container 1, a compression element 2 and a motor 3 disposed in the sealed container 1. This compressor is a rotary compressor.

  A suction pipe 11 is connected to the lower side of the sealed container 1, while a discharge pipe 12 is connected to the upper side of the sealed container 1. The refrigerant gas supplied from the suction pipe 11 is guided to the suction side of the compression element 2.

  The motor 3 is disposed on the upper side of the compression element 2 and drives the compression element 2 via a rotating shaft 4. The motor 3 is disposed in a high-pressure region in the sealed container 1 where the high-pressure refrigerant gas discharged from the compression element 2 is filled.

  The compression element 2 includes a cylindrical main body 20 and an upper end 8 and a lower end 9 attached to upper and lower open ends of the main body 20.

  The rotating shaft 4 passes through the upper end 8 and the lower end 9 and is inserted into the main body 20. The rotating shaft 4 is rotatably supported by a bearing 21 provided at the upper end 8 of the compression element 2 and a bearing 22 provided at the lower end 9 of the compression element 2.

  A crankpin 5 is provided on the rotary shaft 4 in the main body 20 and compression is performed by a compression chamber 7 formed between a piston 6 fitted and driven by the crankpin 5 and a corresponding cylinder. . The piston 6 rotates in an eccentric state or revolves to change the volume of the compression chamber 7.

  The motor 3 includes a cylindrical rotor 30 fixed to the rotating shaft 4 and a stator 40 disposed so as to surround the outer peripheral side of the rotor 30. The stator 40 is disposed on the radially outer side of the rotor 30 via an air gap. That is, the motor 3 is an inner rotor type motor.

  The rotor 30 includes a cylindrical rotor core 31 and a magnet 32 embedded in the rotor core 31. The stator 40 includes an annular stator core 41 and a coil 42 wound around the stator core 41.

  On both end surfaces of the rotor core 31 in the axial direction, an upper end plate 34 and a lower end plate 35 are disposed, respectively. An upper balance weight 37 and a lower balance weight 38 are attached to the upper and lower end plates 34 and 35, respectively.

  As shown in FIGS. 2 and 3, the upper end plate 34 has a restraining surface 341 that restrains the outer peripheral surface of the upper balance weight 37. The restraining surface 341 is an outer peripheral surface of the fitting groove 340. The fitting groove 340 is formed so as to correspond to the shape of the balance weight 37, and the balance weight 37 is fitted therein. In FIG. 3, a gap is drawn between the outer peripheral surface of the balance weight 37 and the restraining surface 341, but the outer peripheral surface of the balance weight 37 and the restraining surface 341 are actually in contact with each other.

  Note that the lower end plate 35 is the same as the upper end plate 34, and a description thereof will be omitted. Also, the lower balance weight 38 is the same as the upper balance weight 37, and thus the description thereof is omitted.

  Four fitting grooves 340 are provided at equal intervals in the circumferential direction of the end plate 34. The shape of the fitting groove 340 is formed in a substantially arc shape in plan view.

  A balance weight 37 is fitted into one of the four fitting grooves 340. Rivets 33 are arranged in the four fitting grooves 340, respectively. The four rivets 33 are located on the radially outer side than the magnet 32.

  Specifically, in the fitting groove 340 in which the balance weight 37 is disposed, the rivet 33 penetrates the balance weight 37, the upper and lower end plates 34 and 35, and the rotor core 31, and is fastened integrally.

  On the other hand, in the fitting groove 340 where the balance weight 37 is not disposed, the rivet 33 penetrates the upper and lower end plates 34 and 35 and the rotor core 31 and is fastened integrally. That is, the end (head) of the rivet 33 is accommodated in the fitting groove 340.

  According to the rotor configured as described above, the end plate 34 has the restraining surface 341 that restrains the outer peripheral surface of the balance weight 37, and therefore centrifugal force applied to the balance weight 37 due to the rotation of the rotor core 31 is applied to the end plate 34. Can be received by the restraining surface 341.

  For this reason, it is not necessary to hold the centrifugal force of the balance weight 37 with a plurality of rivets 33, and an inexpensive balance weight 37 with less shape restrictions can be used. Further, even if the balance weight 37 is formed of a magnetic material, it is not necessary to hold the balance weight 37 with a plurality of rivets 33, so that leakage of magnetic flux through the plurality of rivets 33 can be prevented.

  Here, the balance weight 37 is fastened by a single rivet 33, but the single rivet 33 is not subjected to the centrifugal force of the balance weight 37, and the balance weight 37 is inserted from the fitting groove 340. Jumping out of the rotor core 31 in the axial direction is prevented. Thus, since it is not necessary to maintain the centrifugal force of the balance weight 37 with the rivet 33, the diameter of the rivet 33 can be reduced. Therefore, in general, the position of the rivet 33 relative to the rotor core 31 is restricted by the position of the magnet 32 and the like, but only one small-diameter rivet 33 is used to fasten one balance weight 37. Since it is used, restrictions on the position of the rivet 33 are reduced. For this reason, the restrictions on the shape of the balance weight 37 are reduced.

  The fitting groove 340 includes the restraining surface 341 and is formed so as to correspond to the shape of the balance weight 37. Since the balance weight 37 is fitted, the centrifugal force of the balance weight 37 is increased. The holding rivet 33 becomes unnecessary. Here, when the balance weight 37 is press-fitted into the fitting groove 340, the fitting groove 340 restrains the inner peripheral surface of the balance weight 37 in addition to the restraining surface 341 that restrains the outer peripheral surface of the balance weight 37. The restraint surfaces and the restraint surfaces that restrain the (circumferential) side surfaces of the balance weight 37 are provided, and the centrifugal force of the balance weight 37 can be more reliably held by these restraint surfaces.

  Note that the lower end plate 35 and the lower balance weight 38 also have the same effects as described above, and thus the description thereof is omitted.

  Moreover, according to the motor 3 having the above-described configuration, since the rotor 30 is provided, the inexpensive and highly reliable motor 3 can be provided.

  Moreover, according to the compressor of the said structure, since the said motor 3 is provided, an inexpensive and reliable compressor can be provided.

(Second Embodiment)
FIG. 4 shows a second embodiment of the rotor of the present invention. If the point which is different from the said 1st Embodiment is demonstrated, in this 2nd Embodiment, the shape of the insertion groove | channel of an end plate is different. Note that the same reference numerals as those in the first embodiment have the same configurations as those in the first embodiment, and thus description thereof is omitted.

  As shown in FIG. 4, the fitting groove 340 </ b> A of the end plate 34 </ b> A is formed in an annular shape centering on the axis (rotating shaft 4) of the rotor core 31. A constraining surface 341A that is an outer peripheral surface of the fitting groove 340A is formed in an annular shape. The outer peripheral surface of the balance weight 37 is restrained by the restraining surface 341A. In FIG. 4, a gap is drawn between the outer peripheral surface of the balance weight 37 and the restraining surface 341 </ b> A, but the outer peripheral surface of the balance weight 37 and the restraining surface 341 </ b> A are actually in contact with each other.

  Therefore, since the fitting groove 341A includes the restraining surface 341A and is formed in an annular shape around the axis of the rotor core 31, the fitting groove 341A can be easily formed.

  In addition, this invention is not limited to the above-mentioned embodiment. For example, the balance weight may be fixed to the fitting groove by shrink fitting, cold fitting, caulking, press fitting, or the like. In this case, a rivet for fastening the balance weight can be eliminated.

  Moreover, you may make it provide the constraining surface which restrains the circumferential side surface of a balance weight in an end plate, and can hold | maintain the centrifugal force of a balance weight with the constraining surface of an end plate. Moreover, you may make it provide the restraint surface which restrains the inner peripheral surface of a balance weight in an end plate. In other words, the end plate may be provided with a constraining surface that constrains at least one of the outer peripheral surface, inner peripheral surface, or (circumferential) side surface of the balance weight. It can be held on the restraint surface.

  Further, the shape of the fitting groove may be a square shape, a circular shape, or the like, and the number of fitting grooves can be changed freely. That is, the change in the shape of the restraint surface and the change in increase / decrease in the number of restraint surfaces are freely changeable.

  Moreover, it is good also considering the restraint surface as the inner peripheral surface of the wall part and collar part which were provided so that it might protrude on the upper surface of an end plate other than the outer peripheral surface of a fitting groove. That is, you may make it form a constrained surface by a recessed part or a convex part.

  Further, the end plate may be fixed to the rotating shaft by fitting such as shrink fitting or press fitting, and the holding force of the end plate to the rotor core can be strengthened. Further, the balance weight may be formed by sintering, the balance weight material can be made inexpensive, and the dimension processing for the fitting groove of the balance weight becomes unnecessary.

  The balance weight and the number of rivets can be changed freely. Moreover, you may arrange | position a rivet inside radial direction rather than a magnet. In addition to the rotary type, a scroll type or a reciprocating type may be used as the compression element. Moreover, you may mount the motor which has the rotor of the said embodiment in apparatuses other than a compressor.

DESCRIPTION OF SYMBOLS 1 Airtight container 2 Compression element 3 Motor 4 Rotating shaft 5 Crank pin 6 Piston 7 Compression chamber 30 Rotor 31 Rotor core 32 Magnet 33 Rivet 34, 34A, 35 End plate 340, 340A Insertion groove 341, 341A Constraining surface 37, 38 Balance weight 40 Stator 41 Stator core 42 Coil

Claims (6)

A rotor core (31);
End plates (34, 34A, 35) located on both axial end faces of the rotor core (31);
A balance weight (37, 38) attached to the end plate (34, 34A, 35),
The end plates (34, 34A, 35) have constraining surfaces (341, 341A) for constraining at least one of the outer peripheral surface, inner peripheral surface, and side surfaces of the balance weight (37, 38). Rotor. The rotor according to claim 1, wherein
The rotor, wherein the end plates (34, 34A, 35) have constraining surfaces (341, 341A) for constraining the outer peripheral surface of the balance weight (37, 38). The rotor according to claim 2, wherein
The restraining surface (341) is the outer peripheral surface of the fitting groove (340),
The rotor, wherein the fitting groove (340) is formed to correspond to the shape of the balance weight (37, 38), and the balance weight (37, 38) is fitted therein. The rotor according to claim 2, wherein
The restraining surface (341A) is the outer peripheral surface of the fitting groove (340A),
The fitting groove (340A) is formed in an annular shape centering on the axis of the rotor core (31). A rotor (30) according to any one of claims 1 to 4;
A motor comprising: a stator (40) arranged so as to surround an outer peripheral side of the rotor (30). A sealed container (1);
A compression element (2) arranged in the sealed container (1);
6. A compressor comprising a motor (3) according to claim 5, which is arranged in the sealed container (1) and drives the compression element (2) via a rotating shaft (4).

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