JP2015076953A - Hermetic type motor compressor and air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a leak current caused by floating electrostatic capacitance between a coil and a stator core.SOLUTION: A hermetic type motor compressor includes a compression mechanism unit and a motor for driving the compression mechanism unit via a rotary shaft in a closed vessel. The stator 7b of the motor includes a stator core 23, a coil 24 wound around the stator core, and an insulation material 32 provided between the stator core and the coil. The insulation material is constituted of a plurality of laminated insulation thin plates 32a and 32b. A folding section 32aa is formed at both ends in an axial direction of the insulation thin plate 32a of one side of the plurality of laminated insulation thin plates. The end in the axial direction of the insulation thin plate 32b of the other side of the plurality of laminated insulation thin plates is inserted into the folding section.

Description

  The present invention relates to a hermetic electric compressor and an air conditioner, and particularly as a refrigeration cycle component such as a refrigeration air conditioner (for example, an air conditioner, a refrigerator, a freezer, a refrigeration / refrigeration showcase, etc.) or a heat pump hot water supply device. It is suitable as a hermetic electric compressor to be used.

  An electric motor used for a compressor includes a rotor and a stator disposed radially outside the rotor, and the stator faces the stator core and both axial end surfaces of the stator core. And the windings wound around the stator core and the insulator. The winding and the stator core are insulated with an insulating material.

  Currently, R410A, which is widely used as a refrigerant for air conditioners, has a global warming potential of 2088 and is required to use a refrigerant with a smaller environmental load. As a candidate for this, the use of R32 having a global warming potential of 675 (that is, about one third of R410A) as a refrigerant is being studied.

  However, R32 has a higher dielectric constant than R410A. Therefore, when R32 is adopted as the refrigerant, even if an insulating material is provided between the winding and the stator core to insulate, the floating electrostatic capacity between the winding and the stator core increases, resulting in leakage current. Cannot be reduced sufficiently.

  As a conventional technique for reducing the leakage current, there is one described in Patent Document 1 (Japanese Patent Laid-Open No. 8-107642). In this Patent Document 1, the contact surface between the stator iron core and the insulating paper has a structure having a plurality of irregularities on the insulating paper side or the stator iron core side, and the contact area between the insulating paper and the stator is reduced. The current is reduced.

JP-A-8-107642

  However, even if the insulating paper or the stator core has a structure with irregularities, the refrigerant accumulates in the gap between the insulating paper and the stator core, so that current leaks from the insulating paper side to the stator core side through the refrigerant. End up. Therefore, there is a problem that the leakage current cannot be reduced even if the contact area between the insulating paper and the stator core is reduced.

  Since the dielectric constant of the refrigerant is generally higher than that of the insulating paper, the floating electrostatic capacity between the winding and the stator core is rather increased in the case of Patent Document 1 described above. Therefore, in the stator of the electric motor described in Patent Document 1, the leakage current due to the floating capacitance cannot be reduced, and in particular, when a refrigerant such as R32 having a high relative dielectric constant is used, the winding It becomes difficult to reduce the leakage current caused by the stray capacitance between the core and the stator core.

  An object of the present invention is to obtain a hermetic electric compressor and an air conditioner that can reduce leakage current caused by stray capacitance between a winding and a stator core.

  In order to achieve the above object, the present invention provides a hermetic electric compressor comprising a hermetic container including a compression mechanism portion and an electric motor that drives the compressor mechanism portion via a rotating shaft. The stator includes a stator core, a coil wound around the stator core, and an insulating material disposed between the stator core and the coil. Insulated thin plates are laminated, and some of the plurality of insulating thin plates are formed with folded portions at both ends in the axial direction, and the folded portions are formed of the plurality of insulating thin plates. An axial end of another insulating thin plate is inserted.

  Another feature of the present invention is a hermetic electric compressor having a compression mechanism portion and an electric motor that drives the compressor mechanism portion via a rotating shaft in a hermetic container, and the stator of the electric motor Has a stator core, a coil wound around the stator core, and an insulating material disposed between the stator core and the coil. The insulating material is made of a plurality of resins. The insulating thin plates are laminated, and the plurality of insulating thin plates are welded to each other at least at a part of each of both axial end portions of the insulating thin plates or at an arbitrary position of the insulating thin plate.

  Still another feature of the present invention is an air conditioner in which a hermetic electric compressor, a condenser, an expansion valve, and an evaporator are sequentially connected in a ring to form a refrigerant circuit, and the refrigerant flowing through the refrigerant circuit Is either a single refrigerant of R32 or a mixed refrigerant containing 50% by weight or more of R32, and the hermetic electric compressor uses any one of the hermetic electric compressors described above. .

  ADVANTAGE OF THE INVENTION According to this invention, there exists an effect which can obtain the hermetic type electric compressor and air conditioning apparatus which can reduce the leakage current resulting from the floating electrostatic capacitance between a coil | winding and a stator core.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional view showing a first embodiment of a hermetic electric compressor according to the present invention. The perspective view which shows the stator core of the electric motor shown in FIG. The bottom view which shows the insulator of the electric motor shown in FIG. The perspective view which looked at the insulator of the electric motor shown in Drawing 1 from the upper part. FIG. 5 is a cross-sectional view in the vicinity of the teeth portion of the stator core in the electric motor shown in FIG. 1, and is a cross-sectional view taken along line VV in FIG. 1. FIG. 6 is an exploded view of the insulating material shown in FIG. 5. FIG. 6 is a diagram illustrating Example 2 of the hermetic electric compressor according to the present invention, and is a cross-sectional view of the vicinity of a teeth portion of a stator core in the motor, corresponding to FIG.

  Hereinafter, specific examples of the present invention will be described with reference to the drawings. In addition, the part which attached | subjected the same code | symbol in each figure has shown the part which is the same or it corresponds.

A first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a longitudinal sectional view of a hermetic electric compressor showing the first embodiment, and the hermetic electric compressor of this embodiment is provided in a refrigerant circuit constituting an air conditioner. That is, the air conditioner is configured such that a hermetic electric compressor, a condenser, an expansion valve, and an evaporator are sequentially connected in a ring to form a refrigerant circuit. In this embodiment, the refrigerant flowing through the refrigerant circuit Uses a single refrigerant of R32 or a mixed refrigerant containing 50 wt% or more of R32, and the hermetic type of Example 1 described below as a hermetic electric compressor constituting the refrigerant circuit An electric compressor is used.
[Overall configuration of hermetic electric compressor]
The overall configuration of the hermetic electric compressor according to the first embodiment will be described with reference to FIG. The hermetic electric compressor 50 of this embodiment is used as a component device of an air conditioner, and includes a hermetic container 1, a compression mechanism unit 2, and an electric motor 7 as main components.

  The sealed container 1 includes a cylindrical tube portion 1a, a lid portion 1b and a bottom portion 1c attached to the top and bottom of the tube portion 1a by welding, and the inside is a sealed space. Further, the compression mechanism 2 and the electric motor 7 are accommodated in the sealed container 1, and an oil reservoir 9 is formed at the bottom of the sealed container 1. The oil reservoir 9 stores a lubricating oil 8 composed of an ether-based or ester-based refrigerator oil or the like. The oil level of the lubricating oil 8 is set to be positioned above the auxiliary bearing 15 that supports the lower portion of the rotating shaft 6 that transmits the driving force of the electric motor 7 to the compression mechanism portion 2.

  Reference numeral 11 denotes a suction pipe attached through the lid 1b of the sealed container 1, and 22 denotes a discharge pipe attached through the cylinder 1a of the sealed container 1. The discharge pipe 22 is disposed immediately below the compression mechanism portion 2 and is provided so as to protrude in the center direction in the sealed container 1, and the tip of the discharge pipe 22 is centered from the outer peripheral surface of the end coil 17 in the electric motor 7. It is installed to project to the side and open.

  The compression mechanism 2 compresses a gas refrigerant such as R32 and discharges it into the sealed container 1, and is installed in the upper part of the sealed container 1. The compression mechanism unit 2 includes a fixed scroll 3, a turning scroll 4, a frame 5, and an Oldham ring 10 as main components.

  The fixed scroll 3 is configured by standing a spiral wrap on an end plate, and is bolted to the frame 5. A suction port 12 is provided in the peripheral portion of the fixed scroll 3, and a discharge port 14 is provided in the central portion. The suction port 12 communicates with the suction pipe 11, and the discharge port 14 communicates with a discharge chamber 40 above the compression mechanism portion 2 in the sealed container 1.

  The orbiting scroll 4 is configured by standing a spiral wrap on an end plate, and the orbiting scroll 4 is disposed so as to be sandwiched between the fixed scroll 3 and the frame 5 and is fixed. A compression chamber is formed by meshing the scroll 3 and the orbiting scroll 4. A boss portion 4b into which the orbiting bearing 4a is incorporated is provided on the back side (the anti-fixed scroll side) of the orbiting scroll 4. An eccentric pin portion 6a of the rotary shaft 6 is fitted to the orbiting bearing 4a in order to drive the orbiting scroll 4 eccentrically.

  The Oldham ring 10 constitutes a rotation restricting mechanism of the orbiting scroll 4, and is installed between the orbiting scroll 4 and the frame 5 to prevent the orbiting scroll 4 from rotating and to make a circular orbit. It is intended to exercise.

  The frame 5 is fixed to the sealed container 1 by welding, and supports the fixed scroll 3, Oldham ring 10, and orbiting scroll 4. In the center of the frame 5, a cylindrical portion 5 a that protrudes downward is provided. A main bearing 5b for supporting the rotary shaft 6 is provided in the cylindrical portion 5a.

  A plurality of discharge gas passages (not shown) that connect the upper space (discharge chamber 40) of the fixed scroll 3 and the lower space of the frame 5 are formed in the outer peripheral portions of the fixed scroll 3 and the frame 5.

  The electric motor 7 includes a rotor 7a integrally formed on the rotary shaft 6 by shrink fitting and a stator 7b fixed to the inner surface of the hermetic container 1 by shrink fitting, and the rotor 7a. Is attached with a balance weight 16. That is, an upper balance weight (compression mechanism side balance weight) 16a is attached to the upper end surface of the rotor 7a, and a lower balance weight (anti-compression mechanism side balance weight) 16b is attached to the lower end surface. The balance weights 16a and 16b are fixed to the rotor 7a by a plurality of rivets, respectively.

  The stator 7b includes a stator core (hereinafter simply referred to as an iron core) 23 for efficiently transmitting a rotating magnetic field, and a plurality of conductors wound around the iron core 23 to generate a rotating magnetic field by flowing an electric current. The main component is a coil 24 and a resin molded insulator 26 provided at both ends in the axial direction of the iron core 23 and used for insulation between the coil 24 and the iron core 23. The two insulators 26 provided at both ends in the axial direction of the iron core 23 are arranged so as to face each other with the iron core 23 interposed therebetween.

  The coil 24 is wound around the iron core 23 by a concentrated winding method. A large number of notches (not shown) in the axial direction are formed on the outer periphery of the stator 7b, and a discharge gas passage is formed between the notches and the sealed container 1.

  The rotor 7a is composed mainly of a rotor core (hereinafter also simply referred to as an iron core) 25 and a permanent magnet built in the core 25, and converts a rotating magnetic field from the stator 7b into a rotational motion. The rotating shaft 6 is rotated. The rotor 7a is rotatably disposed in a central hole 23a (see FIG. 2) of the iron core 23 of the stator 7b.

  The rotary shaft 6 is inserted into and fitted in the central hole of the rotor 7a, and is integrated with the rotor 7a. Further, one end side (upper end side) of the rotating shaft 6 extends from the rotor 7a to the compression mechanism portion 2 side, and an eccentric pin portion 6a formed at the end portion of the rotating shaft 6 serves as the compression mechanism portion. 2 to be engaged. Accordingly, an eccentric force is applied to the eccentric pin portion 6a by the compression operation of the compression mechanism portion 2. The other end side (lower end side) of the rotating shaft 6 is extended from the rotor 7 a to the oil reservoir 9 side at the bottom of the sealed container 1. The rotating shaft 6 is supported by the main bearing 5b and the auxiliary bearing 15 on both sides of the rotor 7a, and is configured to be stably rotatable. The auxiliary bearing 15 is supported by a support member 41 fixed to the sealed container 1 by welding, and is immersed in the lubricating oil 8.

The rotating shaft 6 is provided with a through hole 6b for supplying the lubricating oil 8 at the bottom of the sealed container 1 to each bearing part and each sliding part, and the lubricating oil 8 in the oil reservoir 9 is provided in the through hole 6b. Is sucked up to the compression mechanism 2 side. The lubricating oil 8 sucked up to the compression mechanism portion 2 side is supplied to the slewing bearing 4a and the main bearing 5b, and each sliding portion of the compression mechanism portion 2 (the sliding portion of the Oldham ring 10 and both scrolls 3). , 4 sliding portion).
The lubricating oil 8 supplied to the sliding portion of the compression mechanism portion 2 is discharged into the discharge chamber 40 from the discharge port 14 provided at the center portion of the fixed scroll 3 together with the refrigerant gas.

When the electric motor 7 is energized and the rotor 7a rotates, the shaft 6 is also rotated accordingly, and the eccentric pin portion 6a performs an eccentric rotational movement, whereby the orbiting scroll 4 is driven to rotate, and the fixed scroll 3 And the compression chamber formed between the orbiting scroll 4 becomes smaller while moving from the outer peripheral side to the center. As a result, the refrigerant gas sucked from the outside of the sealed container 1 through the suction pipe 11 and the suction port 12 is compressed by the compression mechanism unit 2, and the compressed refrigerant gas is discharged from the discharge port 14 at the center of the fixed scroll 3. Is discharged into the discharge chamber 40 in the upper part of the sealed container 1.
[Stator core]
FIG. 2 is a perspective view of the stator core 23 of the electric motor 7 shown in FIG. As shown in FIG. 2, the stator core 23 is composed of a plurality of stacked steel plates, and protrudes radially inward from the outer peripheral side annular portion 27 and the inner peripheral surface of the annular portion 27, and in the circumferential direction. The teeth portions 28 are arranged at regular intervals. In addition, 23a is a central hole of the stator core 23, and 33 is a slot.
The electric motor 7 is a so-called 4-pole 6-slot, so-called concentrated winding in which a coil 24 (see FIGS. 1 and 5) is concentrated around one tooth portion 28 without spanning the plurality of tooth portions 28. The method is adopted.
[Insulator]
3 is a bottom view showing the insulator 26 of the electric motor 7 shown in FIG. 1, and FIG. 4 is a perspective view of the insulator 26 as viewed from above. The insulator 26 is sandwiched between the stator core 23 and the coil 24 to insulate the stator core 23 and the coil 24 from each other.
The insulator 26 is made of a resin material having good heat resistance such as liquid crystal polymer (LCP), polybutylene terephthalate (PBT), polyphenylene sulfide (PPS), polyimide, polyester, and the like. Moreover, it is preferable to comprise the insulator 26 with the said material containing glass fiber for the strength improvement.

  As shown in FIGS. 3 and 4, the insulator 26 includes an insulator annular portion 29, and a plurality of body portions 30 that protrude radially inward from the inner peripheral surface of the insulator annular portion 29 and are arranged at equal intervals in the circumferential direction. have.

The insulator annular portion 29 of the insulator 26 is disposed so as to be in contact with both end surfaces of the stator core annular portion 27 of the stator core 23, and the plurality of body portions 30 of the insulator 26 include a plurality of the stator core 23. It arrange | positions so that the both end surfaces of the teeth part 28 may touch. That is, the stator core 23 is configured to be sandwiched between the two insulators 26 from the axial direction.
[Explanation of leakage current]
The hermetic electric compressor is driven by rotating the rotor 7 a together with the rotating shaft 6 by an electromagnetic force generated in the stator 7 b by passing an electric current through the coil 24. A part of the current flowing through the coil 24 leaks to the stator core 23.

  In a hermetic type electric compressor used for an air conditioner or the like, since the stator 7b is directly fixed to the hermetic container 1 made of steel plate, the leakage current is applied to the Electrical Appliance and Material Safety Law so that the human body is not affected. The limit value is defined. That is, the leakage current flowing between the charging unit and the surface of the container is defined to be 1 mA or less. Therefore, it is necessary to take measures so that the leakage current leaking to the stator core 23 out of the current flowing through the coil 24 is 1 mA or less.

  The principle of the leakage current is the same as that of the capacitor. When the leakage current is i, the frequency is f, the floating capacitance is C, and the voltage is V, the following relationship is established.

i = 2πfCV (1)
The stray capacitance C between the coil 24 and the stator core 23 is expressed by the relative dielectric constant ε between the coil 24 and the stator core 23, and the area between the coil 24 and the stator core 23 as S, When the distance between the coil 24 and the stator core 23 is d, the following relationship is established.

C = εS / d (2)
[Relative permittivity of refrigerant R32]
Refrigerant R32, which has been studied as a candidate for the next-generation refrigerant with a low global warming potential, has a higher relative dielectric constant ε than refrigerant R410A. For example, the relative dielectric constant ε of R410A at 40 ° C. is 7.7045, whereas the relative dielectric constant ε of R32 at 40 ° C. is 11.268. That is, when R32 is employed as the refrigerant, the floating capacitance C increases from the above equation (2). For this reason, there exists a possibility that the leakage current i may exceed the value prescribed | regulated to the electrical appliance safety law from said (1) Formula.
[Conventional leakage current countermeasures]
By sandwiching an insulating material between the coil 24 and the stator core 23, the leakage current i can be reduced. However, when R32 is employed as the refrigerant, the leakage current i cannot be kept below the value specified in the Electrical Appliance and Material Safety Law with the currently widely used insulating materials. Although it is conceivable to increase the thickness of the insulating material, increasing the thickness of the insulating material increases the cost and further deteriorates the assemblability. In addition, it is conceivable to secure an insulation distance by increasing the thickness of the insulating coating of the coil 24, but the coil space factor increases as the thickness of the insulating coating of the coil increases, and the assemblability also deteriorates. To do.
[Measures against leakage current according to this embodiment]
5 is a cross-sectional view of the vicinity of the tooth portion 28 of the stator core 23 in the electric motor shown in FIG. 1, and is a cross-sectional view taken along the line V-V shown in FIG. It is a figure explaining the state by which the insulating material 32 is arrange | positioned in the clearance gap between. FIG. 6 is a development view of the insulating material 32 shown in FIG.

  As shown in FIG. 5, in this embodiment, the coil 24 is wound around the tooth portion 28 of the stator core 23 via an insulating material 32 composed of a plurality of insulating thin plates 32a and 32b. In addition, as a material of the said insulating material (insulating thin plate), it is good to comprise with resin materials with good heat resistance, such as a polyethylene terephthalate (PET) and a polyethylene naphthalate (PEN), for example.

  Then, as shown in the developed view of FIG. 6, the insulating material 32 is folded back at both axial end portions (upper and lower end portions) of the insulating thin plate 32a on the coil 24 side among the plurality of insulating thin plates 32a and 32b. A portion 32aa is formed, and another insulating material among the plurality of insulating thin plates, that is, the insulating thin plate 32b on the stator core 23 side is inserted and sandwiched between the upper and lower folded portions 32aa. .

  Then, as shown in FIG. 5, the insulating thin plate 32 a on the coil 24 side of the insulating material 32 is folded at both axial ends of the stator core 23 (upper and lower ends in FIG. 5). The insulating thin plate 32b is sandwiched and fixed by the upper and lower folded portions 32aa of the insulating thin plate 32a, and the insulating material 32 is disposed between the stator core 23 and the coil 24 in the radial direction. That is, the insulating material 32 shown in FIG. 6 is bent so as to match the shape of the slot 33 formed between the teeth portions 28 of the stator core 23 shown in FIG. After the insulating material 32 is inserted into the slot 33, the coil 24 is wound around the tooth portion 28 and the body portion 30 of the insulator 26, whereby the state shown in FIG.

  In the present embodiment, the insulating thin plate 32a on the coil 24 side of the insulating material 32 is thicker than the insulating thin plate 32b on the stator core 23 side. Due to the difference in thickness, the formability of the upper and lower folded portions 32aa in the axial direction of the insulating thin plate 32a is improved, and the thinner insulating thin plate 32b can easily conform to the shape of the thicker insulating thin plate 32a. For this reason, it is possible to easily insert the insulating material 32 into the slot 33 of the stator core 23.

  Further, since the other insulating thin plate material 32b is fixed at the upper and lower folded portions 32aa in the axial direction of the insulating thin plate 32a, the insulating thin plate 32b is displaced in the axial direction when the insulating material 32 is inserted into the slot 33. Can also be prevented. Thereby, at the time of coil winding, the coil 24 contacts the edge part used as the edge part of the insulating thin plate 32b, and it can also suppress that the coil 24 is damaged. That is, since the insulating thin plates 32a and 32b constituting the insulating material 32 are made of a hard resin material such as PET or PEN as described above, the insulating film of the coil 24 is damaged at the edge portion. There is a fear. However, in the present embodiment, since the end surfaces as the edge portions of the insulating thin plates 32a and 2b are configured not to contact the coil, it is possible to suppress damage to the insulating coating of the coil 24.

  Further, in this embodiment, the insulating material 32 is composed of a plurality of insulating thin plates 32a and 32b, and folded portions 32aa are provided at both ends in the axial direction of the insulating thin plate 32a on the coil side, and the other insulating thin plates are formed by this folded portion 32aa. 32b is fixed, so that the distance d between the coil 24 and the stator core 23 is increased by the thickness of the insulating thin plate 32b as compared with the conventional structure made of a single insulating material. Can do. Accordingly, the floating capacitance C can be reduced from the above equation (2), and the leakage current i can be reduced from the above equation (1).

  Furthermore, in this embodiment, the coil-side insulating thin plate 32a constituting the insulating material 32 can be folded back at both ends in the axial direction, and the other insulating thin plate 32b can be firmly sandwiched. Even under operating conditions such that the liquid returns to the position, the liquid refrigerant can hardly enter between the two insulating thin plates 32a and 32b. Therefore, it is possible to obtain an effect that the refrigerant R32 having a high relative dielectric constant can be prevented from flowing between the coil 24 and the stator core 23 to increase the leakage current. That is, since the insulating material 32 having a relative dielectric constant lower than that of R32 and the refrigerating machine oil is disposed between the coil 24 and the stator core 23, the average value of the relative dielectric constant ε can be reduced, and the leakage current i Can be reduced.

  A second embodiment of the present invention will be described with reference to FIG. FIG. 7 is a cross-sectional view of the vicinity of the teeth portion of the stator core in the electric motor of the hermetic electric compressor according to the second embodiment, corresponding to FIG. 5. It is a figure explaining the state by which the insulating material 32 is arrange | positioned in the clearance gap between them. Further, in the description of the second embodiment, parts different from those of the first embodiment will be described, and the other parts are the same as those of the first embodiment, and thus description thereof will be omitted.

  In the first embodiment, the insulating material 32 is composed of a plurality of insulating thin plates 32a and 32b, one of the insulating thin plates 32a is provided with a folded portion 32aa in the vertical direction in the axial direction, and this folded portion 32aa is used as another insulating thin plate material. An example has been described in which 32b is sandwiched and fixed. In contrast, the second embodiment is the same in that the insulating material 32 is composed of a plurality of insulating thin plates (resin-made thin plates) 32a and 32b, but the folded portion 32aa as in the first embodiment is provided. Instead, at least a part of each of the end portions (upper and lower end portions) 32c in the axial direction of the plurality (two in this embodiment) of the insulating thin plates 32a and 32b is welded to each other. .

In this embodiment, all the axial end portions of the insulating thin plates 32a and 32b are welded to each other, but not all the axial end portions of the insulating thin plates 32a and 32b are welded. You may make it do. Alternatively, both the insulating thin plates 32a and 32b may be welded to each other at an arbitrary position of the insulating thin plate regardless of the axial end portions 32c of the insulating thin plates 32a and 32b.
The insulating thin plates 32a and 32b are made of a resin material having good heat resistance such as polyethylene terephthalate (PET) and polyethylene naphthalate (PEN), as in the first embodiment.

Even when configured as in the present embodiment, when the insulating material 32 is inserted into the slot 33 (see FIG. 2) of the stator core 23, the plurality of insulating thin plates 32a and 32b are displaced from each other in the axial direction. Can be prevented. Accordingly, any one of the insulating thin plates jumps out in the axial direction from the other insulating thin plates, and when the coil is wound, the coil 24 comes into contact with the edge portion which becomes the end portion of the protruding insulating thin plate, and the coil 24 is damaged. Can be prevented.
Also in the present embodiment, since the distance d between the coil 24 and the stator core 23 can be increased by the thickness of the insulating thin plate 32b, the leakage current i can be reduced as in the first embodiment. it can.

  Further, since the insulating thin plate 32a and the insulating thin plate 32b are welded at both end portions or at arbitrary positions, the plurality of insulating thin plates 32a and 32b are in close contact with each other and fixed. Therefore, even under an operating condition in which the refrigerant in the refrigerant circuit returns to the inside of the compressor, liquid refrigerant hardly enters between the plurality of insulating thin plates 32a and 32b, and the refrigerant R32 having a high relative dielectric constant is coiled. It is possible to suppress an increase in the leakage current i due to flowing between 24 and the stator core 23. In particular, when the insulating thin plate 32a and the insulating thin plate 32b are configured to be welded at both ends thereof, there is an effect that liquid refrigerant can be more difficult to enter between the insulating thin plates 32a and 32b.

As described above, according to each embodiment of the hermetic electric compressor of the present invention described above, the refrigerant R32 having a high relative permittivity flows between the coil 24 and the stator core 23, and the leakage current i is generated. An increase can be suppressed. Therefore, if the hermetic electric compressor of this embodiment is used in an air conditioner using the refrigerant R32, an air conditioner in which the leakage current is suppressed to 1 mA or less can be obtained.
That is, according to each embodiment of the present invention, it is possible to obtain a hermetic electric compressor and an air conditioner that can reduce leakage current caused by stray capacitance between the coil 24 and the stator core 23. Can do.

In addition, this invention is not limited to an above-described Example, Various modifications are included.
For example, in the above-described embodiment, the example in which the scroll type is adopted as the compression mechanism unit 2 has been described. However, in addition to this, the rotary type, swing type, or reciprocating type compression mechanism unit 2 may be used. good. Further, although the vertical hermetic electric compressor has been described, the invention can be similarly applied to a horizontal type.

  Furthermore, although the case where R32 is used as the refrigerant has been described, the present invention is not limited to this. For example, as the refrigerant, a mixed refrigerant containing 50% by weight or more of R32 or other refrigerants requiring countermeasures against leakage current (for example, R32 and HFO). -1234yf (2,3,3,3-tetrafluoropropene containing refrigerant composition etc.) can be applied in the same manner.

  Further, the above-described embodiments have been described in detail for easy understanding in the present invention, and are not necessarily limited to those having all the configurations described. Furthermore, a part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment.

1: airtight container, 1a: tube portion, 1b: lid portion, 1c: bottom portion,
2: compression mechanism, 3: fixed scroll,
4: orbiting scroll, 4a: orbiting bearing, 4b: boss part,
5: Frame, 5a: Tube portion, 5b: Main bearing,
6: shaft, 6a: eccentric pin portion, 6b: through hole,
7: Electric motor, 7a: Rotor, 7b: Stator,
8: Lubricating oil, 9: Oil reservoir, 10: Oldham ring,
11: suction pipe, 12: suction port, 14: discharge port, 15: auxiliary bearing,
16: balance weight, 16a: upper balance weight, 16b: lower balance weight,
17: End coil, 18a, 18b: Discharge gas passage,
22: discharge pipe, 23: stator core, 23a: center hole,
24: Coil, 25: Rotor core, 26: Insulator,
27: Annular part of stator core, 28: Teeth part,
29: annular portion of the insulator, 30: trunk portion of the insulator,
32: insulating material, 32a: insulating thin plate on the coil side, 32aa: folded portion,
32b: Insulating thin plate on the stator core side, 32c: Both ends of the insulating thin plate,
33: Slot, 40: Discharge chamber, 41: Support member, 50: Hermetic electric compressor.

Claims (10)

A hermetic type electric compressor including a compression mechanism unit and an electric motor that drives the compressor mechanism unit via a rotating shaft in a hermetic container,
The stator of the electric motor has a stator core, a coil wound around the stator core, and an insulating material disposed between the stator core and the coil,
This insulating material is formed by laminating a plurality of insulating thin plates,
Of the plurality of insulating thin plates, a part of the insulating thin plates is formed with folded portions at both ends in the axial direction, and at the folded portion, axial end portions of the other insulating thin plates of the plurality of insulating thin plates. Is a hermetic electric compressor characterized in that is inserted.   2. The hermetic electric compressor according to claim 1, wherein the insulating thin plate on the coil side among the plurality of insulating thin plates has a folded portion formed at both axial end portions thereof, and the folded portions include the plurality of the plurality of insulating thin plates. A hermetic electric compressor, wherein an axial end of an insulating thin plate on the stator core side of the insulating thin plate is inserted.   3. The hermetic electric compressor according to claim 1, wherein the insulating thin plate constituting the insulating material is made of a heat-resistant resin material.   4. The hermetic electric compressor according to claim 3, wherein the resin material forming the insulating thin plate is polyethylene terephthalate (PET) or polyethylene naphthalate (PEN). Compressor.   5. The hermetic electric compressor according to claim 1, wherein insulators are provided at both ends of the stator core in the axial direction, and the coil is attached to both the stator core and the insulator. A hermetic electric compressor characterized by being wound.   6. The hermetic electric compressor according to claim 5, wherein the stator core includes an annular portion on an outer peripheral side and a teeth portion protruding radially inward from the annular portion, and the insulator includes an insulator annular portion. And a body portion protruding radially inward from the annular portion of the insulator, and the coil is wound around the teeth portion of the stator core and the body portion of the insulator in a concentrated winding manner. A sealed electric compressor.   The hermetic electric compressor according to any one of claims 1 to 6, wherein the insulating thin plate on the coil side constituting the insulating material is thicker than the insulating thin plate on the stator core side. A hermetic electric compressor. A hermetic type electric compressor including a compression mechanism unit and an electric motor that drives the compressor mechanism unit via a rotating shaft in a hermetic container,
The stator of the electric motor has a stator core, a coil wound around the stator core, and an insulating material disposed between the stator core and the coil,
This insulating material is formed by laminating a plurality of resin insulating thin plates,
The hermetic electric compressor is characterized in that the plurality of insulating thin plates are welded to each other at at least a part of each of both axial end portions of the insulating thin plates or at any position of the insulating thin plate.   9. The hermetic electric compressor according to claim 8, wherein the plurality of insulating thin plates constituting the insulating material are welded to each other at both axial end portions thereof. Type electric compressor. An air conditioner in which a hermetic electric compressor, a condenser, an expansion valve, and an evaporator are sequentially connected in a ring to form a refrigerant circuit,
The refrigerant flowing through the refrigerant circuit is either a single refrigerant of R32 or a mixed refrigerant containing 50 wt% or more of R32, and the hermetic electric compressor is the hermetic seal according to any one of claims 1 to 8 An air conditioner characterized by using an electric compressor.

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