WO2021171471A1 - 室外機および空気調和装置 - Google Patents

室外機および空気調和装置 Download PDF

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Publication number
WO2021171471A1
WO2021171471A1 PCT/JP2020/008002 JP2020008002W WO2021171471A1 WO 2021171471 A1 WO2021171471 A1 WO 2021171471A1 JP 2020008002 W JP2020008002 W JP 2020008002W WO 2021171471 A1 WO2021171471 A1 WO 2021171471A1
Authority
WO
WIPO (PCT)
Prior art keywords
heat radiating
outdoor unit
radiating member
heat exchanger
support plate
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2020/008002
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
貴也 下川
洋樹 麻生
和慶 土田
隆徳 渡邉
諒伍 ▲高▼橋
直己 田村
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to CN202080097091.9A priority Critical patent/CN115135934A/zh
Priority to PCT/JP2020/008002 priority patent/WO2021171471A1/ja
Priority to EP20920857.8A priority patent/EP4113022A4/en
Priority to AU2020431701A priority patent/AU2020431701C1/en
Priority to JP2022502704A priority patent/JP7374293B2/ja
Priority to US17/793,451 priority patent/US20230035739A1/en
Publication of WO2021171471A1 publication Critical patent/WO2021171471A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
    • F24F1/38—Fan details of outdoor units, e.g. bell-mouth shaped inlets or fan mountings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
    • F24F1/46—Component arrangements in separate outdoor units
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
    • F24F1/56—Casing or covers of separate outdoor units, e.g. fan guards
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/27—Rotor cores with permanent magnets
    • H02K1/2706—Inner rotors
    • H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
    • H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
    • H02K1/2746—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets arranged with the same polarity, e.g. consequent pole type
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/28—Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures
    • H02K1/30—Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures using intermediate parts, e.g. spiders
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
    • H02K11/30—Structural association with control circuits or drive circuits
    • H02K11/33—Drive circuits, e.g. power electronics
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/18—Casings or enclosures characterised by the shape, form or construction thereof with ribs or fins for improving heat transfer
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
    • H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information

Definitions

  • This disclosure relates to outdoor units and air conditioners.
  • the outdoor unit has a blower and a heat exchanger.
  • the blower has a fan portion and a motor for rotating the fan portion.
  • Some motors have a concave pole type rotor including a magnet magnetic pole composed of a permanent magnet and a virtual magnetic pole composed of a rotor core (see, for example, Patent Document 1).
  • the virtual magnetic pole does not have a permanent magnet, a part of the magnetic flux generated from the magnet magnetic pole easily leaks to the outside of the motor.
  • magnetic flux flows through members such as bearings or circuit boards arranged around the motor, heat is generated by electromagnetic induction in these members as the rotor rotates. Therefore, it is required to efficiently dissipate the heat of the motor.
  • the present disclosure has been made to solve the above problems, and an object of the present disclosure is to efficiently dissipate the heat of the motor.
  • the outdoor unit of the present disclosure has a motor and a heat exchanger.
  • the motor has a rotor, a stator, and a heat radiating member.
  • the rotor is rotatable about an axis and has a rotor core and a permanent magnet attached to the rotor core.
  • the permanent magnet constitutes a magnet magnetic pole, and a part of the rotor core constitutes a virtual magnetic pole.
  • the stator surrounds the rotor from the outside in the radial direction about the axis.
  • the heat radiating member is arranged on one side in the direction of the axis of the stator.
  • the heat exchanger is arranged so as to face the heat radiating member in the direction of the axis.
  • the heat exchanger is arranged so as to face the heat radiating member, air having passed through the heat exchanger and whose temperature has dropped can be blown to the heat radiating member. Therefore, the heat of the motor can be efficiently dissipated from the heat radiating member.
  • FIG. It is a vertical sectional view which shows the outdoor unit of Embodiment 1.
  • FIG. It is a vertical sectional view which shows the blower of Embodiment 1.
  • FIG. It is a cross-sectional view which shows the motor of Embodiment 1.
  • FIG. It is sectional drawing which shows the rotor of Embodiment 1.
  • FIG. It is a vertical sectional view which shows the mold stator of Embodiment 1.
  • FIG. It is a top view (A) and a side view (B) which show the mold stator of Embodiment 1.
  • FIG. It is a front view which shows the support plate of Embodiment 1.
  • FIG. It is a figure which shows the relationship between the heat exchanger, a heat radiating member, and a support plate in Embodiment 1.
  • FIG. 1 It is a schematic diagram which shows the heat exchanger of Embodiment 1. It is a schematic diagram (A) for explaining the magnetic flux flow of a concave pole type rotor, and the schematic diagram (B) for explaining the magnetic flux flow of a non-consequent pole type rotor. It is a schematic diagram which shows the air flow in the blower of Embodiment 1.
  • FIG. 1 It is a schematic diagram which shows the heat flow in the blower of Embodiment 1.
  • FIG. It is a schematic diagram for demonstrating the exposed area of the heat radiating member and the bracket in the blower of Embodiment 1.
  • FIG. It is a figure which shows the air conditioner provided with the outdoor unit of Embodiment 1.
  • FIG. 1 is a vertical cross-sectional view showing the outdoor unit 100 of the first embodiment.
  • the outdoor unit 100 constitutes a part of an air conditioner such as a room air conditioner.
  • the outdoor unit 100 includes a unit housing 8 which is an outer frame, a blower 1 arranged in the unit housing 8, a support plate 9 for supporting the blower 1, and a unit housing 8. It has a heat exchanger 7 arranged on the back surface.
  • the direction of the axis C1 which is the rotation center axis of the motor 10 (described later) of the blower 1 is referred to as an axial direction.
  • the circumferential direction centered on the axis C1 is referred to as a "circumferential direction” and is indicated by an arrow R1 in FIG. 3 and the like.
  • the radial direction centered on the axis C1 is referred to as "diameter direction”.
  • a cross-sectional view in a cross section parallel to the axial direction is referred to as a "vertical cross-sectional view”
  • a cross-sectional view in a cross section orthogonal to the axial direction is referred to as a "cross-sectional view”.
  • the outdoor unit 100 is placed on a horizontal surface here.
  • the horizontal plane is the XY plane, and the vertical direction is the Z direction.
  • the Y direction is parallel to the axial direction and is the front-rear direction of the outdoor unit 100.
  • the unit housing 8 has a bottom plate 81 and a top plate 82, and has side plates (not shown) at both ends in the X direction.
  • the bottom plate 81, the top plate 82, and the side plates are all made of sheet metal, for example.
  • a front panel 85 is attached to the front surface of the unit housing 8.
  • An opening 86 is formed in the front panel 85, and a grill (not shown) is fitted in the opening 86.
  • the grill is a combination of a plurality of iron wires in a grid pattern.
  • the opening 86 is a portion where air is discharged by the blower 1.
  • the support plate 9 extends in the Z direction, has a lower arm 91 at the lower end, and has an upper arm 92 at the upper end.
  • the lower arm 91 of the support plate 9 is fixed to the bottom plate 81.
  • the top plate 82 is fixed to the upper arm 92 of the support plate 9.
  • the support plate 9 is made of a metal such as carbon steel.
  • the motor 10 of the blower 1 is fixed to the support plate 9 with screws 48.
  • FIG. 2 is a vertical cross-sectional view showing the blower 1.
  • the blower 1 has a motor 10 and a fan portion 6 rotated by the motor 10.
  • the motor 10 has a rotor 2 having a shaft 26 and a stator 5 that surrounds the rotor 2 from the outside in the radial direction.
  • the central axis of the shaft 26 is the above-mentioned axis C1.
  • the fan portion 6 is fixed to the shaft 26 of the motor 10. In the direction of the axis C1, the side on which the fan portion 6 is provided is the front side.
  • the motor 10 has a mold resin portion 40 that surrounds the stator 5 from the outside in the radial direction.
  • the mold resin portion 40 is formed of a thermosetting resin such as BMC (bulk molding compound).
  • BMC bulk molding compound
  • the mold stator 4 is composed of the stator 5 and the mold resin portion 40.
  • the mold resin portion 40 has an opening 41 on one side in the axial direction and a bearing holding portion 42 on the other side.
  • the rotor 2 of the motor 10 is inserted into the hollow portion inside the mold stator 4 through the opening 41.
  • the shaft 26 protrudes in the axial direction from the opening 41 of the mold stator 4.
  • a fan portion 6 is attached to the tip portion of the shaft 26. Therefore, the side on which the shaft 26 protrudes is referred to as the "load side”, and the opposite side is referred to as the "anti-load side”.
  • a bracket 15 as a rotor holding member is attached to the opening 41 of the mold resin portion 40.
  • the bracket 15 is made of a metal such as a galvanized steel plate.
  • the bracket 15 holds one bearing 11 that supports the shaft 26.
  • the bearing holding portion 42 of the mold resin portion 40 holds the other bearing 12 that supports the shaft 26.
  • the mold resin portion 40 has a mounting leg 45 that projects outward in the radial direction.
  • the mold resin portion 40 is fixed to the support plate 9 by a screw 48 (FIG. 1) as a fixing member on the mounting legs 45.
  • the circuit board 55 is arranged on the opposite load side of the stator 5.
  • the circuit board 55 is a printed circuit board on which an element 56 such as a power transistor for driving the motor 10 is mounted, and a lead wire 57 is wired.
  • the lead wire 57 of the circuit board 55 is pulled out from the lead wire lead-out component 58 attached to the outer peripheral portion of the mold resin portion 40 to the outside of the motor 10.
  • a magnetic sensor for detecting the rotational position of the rotor 2 is provided on the surface of the circuit board 55 on the stator 5 side.
  • the mold resin portion 40 covers the stator 5, but instead of the mold resin portion 40, the stator 5 may be covered with, for example, a metal housing.
  • the shaft 26 of the rotor 2 is made of iron or stainless steel.
  • the shaft 26 is rotatably supported by a bearing 11 held by the bracket 15 and a bearing 12 held by the bearing holding portion 42.
  • the fan portion 6 has a bottomed cylindrical hub 61 attached to the shaft 26, and a plurality of blades 62 provided on the outer periphery of the hub 61.
  • the hub 61 has a cylindrical wall 61a centered on the axis C1, a disk portion 61b located at the axial end of the cylindrical wall 61a, and a plurality of ribs 61d formed on the inner peripheral side of the cylindrical wall 61a. ..
  • the disk portion 61b of the hub 61 has a through hole 61c through which the screw portion 26a formed at the tip end portion of the shaft 26 passes.
  • the plurality of ribs 61d on the inner peripheral side of the cylindrical wall 61a are formed at equal intervals in the circumferential direction.
  • the hub 61 is fixed to the shaft 26 by attaching the nut 63 to the threaded portion 26a of the shaft 26.
  • the blades 62 are provided on the outer periphery of the hub 61 at equal intervals in the circumferential direction.
  • the number of blades 62 is, for example, three, but it may be two or more. As the fan portion 6 rotates with the shaft 26, the blades 62 generate an axial air flow.
  • the fan portion 6 is made of resin, and more specifically, it is desirable that the fan portion 6 is made of a material obtained by adding glass fiber and mica to polypropylene (PP).
  • PP polypropylene
  • FIG. 3 is a cross-sectional view showing the motor 10.
  • the motor 10 has a rotor 2 and an annular stator 5 that surrounds the rotor 2.
  • the motor 10 is also a permanent magnet embedded motor in which the permanent magnet 25 is embedded in the rotor 2.
  • An air gap G of, for example, 0.4 mm is provided between the rotor 2 and the stator 5.
  • the stator 5 has a stator core 50 and a coil 54 wound around the stator core 50.
  • the stator core 50 is formed by laminating a plurality of electromagnetic steel sheets in the axial direction and fixing them by caulking or the like.
  • the thickness of the electromagnetic steel sheet is, for example, 0.2 mm to 0.5 mm.
  • the stator core 50 has an annular yoke 51 centered on the axis C1 and a plurality of teeth 52 extending radially inward from the yoke 51.
  • the teeth 52 are arranged at equal intervals in the circumferential direction.
  • the number of teeth 52 is twelve here, but is not limited to twelve.
  • the radial inner tip 52a of the teeth 52 is wider in the circumferential direction than the other parts of the teeth 52.
  • the tip portion 52a of the teeth 52 faces the outer periphery of the rotor 2 via the air gap G described above.
  • An insulating portion 53 such as polybutylene terephthalate (PBT) is attached to the stator core 50.
  • the insulating portion 53 can be obtained by integrally molding the resin with the stator core 50 or by assembling a pre-molded resin molded body to the stator core 50.
  • the coil 54 is wound around the teeth 52 via the insulating portion 53.
  • the coil 54 is made of copper or aluminum.
  • FIG. 4 is a cross-sectional view showing the rotor 2.
  • the rotor core 20 is an annular member centered on the axis C1.
  • the rotor core 20 is formed by laminating a plurality of electromagnetic steel sheets in the axial direction and fixing them with a caulking portion 27.
  • the thickness of the electromagnetic steel sheet is, for example, 0.2 mm to 0.5 mm.
  • the rotor core 20 has a plurality of magnet insertion holes 21.
  • the magnet insertion holes 21 are arranged equidistantly in the circumferential direction and equidistant from the axis C1.
  • the number of magnet insertion holes 21 is 5 here.
  • the magnet insertion hole 21 extends linearly in the direction orthogonal to the radial center, that is, the radial straight line (referred to as the magnetic pole center line) passing through the polar center.
  • the magnet insertion hole 21 is not limited to such a shape, and may extend in a V shape, for example.
  • Flux barriers 22 which are holes are formed at both ends of the magnet insertion hole 21 in the circumferential direction. A thin portion is formed between the flux barrier 22 and the outer circumference of the rotor core 20. In order to suppress the leakage flux between the adjacent magnetic poles, it is desirable that the thickness of the thin portion is the same as the thickness of the electromagnetic steel plate constituting the rotor core 20.
  • a permanent magnet 25 is inserted into each magnet insertion hole 21.
  • the permanent magnet 25 has a flat plate shape, and the cross-sectional shape orthogonal to the axial direction is rectangular.
  • the permanent magnet 25 is composed of a rare earth magnet. More specifically, the permanent magnet 25 is composed of a neodymium sintered magnet containing neodymium (Nd), iron (Fe) and boron (B).
  • the permanent magnets 25 are arranged with the same magnetic poles (for example, N poles) facing each other toward the outer peripheral side of the rotor core 20.
  • a magnetic pole for example, an S pole
  • S pole opposite to the permanent magnet is formed in a region between the permanent magnets adjacent to each other in the circumferential direction.
  • the rotor 2 is formed with five magnet magnetic poles P1 composed of permanent magnets 25 and five virtual magnetic poles P2 composed of the rotor core 20. Such a configuration is called a sequential pole type. In the following, when the term "magnetic pole" is simply used, it is assumed that both the magnetic magnetic pole P1 and the virtual magnetic pole P2 are included.
  • the rotor 2 has 10 magnetic poles.
  • the number of permanent magnets 25 can be halved as compared with the non-consequent pole type rotor having the same number of poles. Since the number of expensive permanent magnets 25 is small, the manufacturing cost of the rotor 2 is reduced.
  • the number of poles of the rotor 2 is 10, but the number of poles may be an even number of 4 or more.
  • one permanent magnet 25 is arranged in one magnet insertion hole 21 here, two or more permanent magnets 25 may be arranged in one magnet insertion hole 21.
  • the magnet magnetic pole P1 may be the S pole and the virtual magnetic pole P2 may be the N pole.
  • the rotor core 20 has at least one slit 23 that is long in the radial direction on the virtual magnetic pole P2.
  • the slit 23 has a function of rectifying the flow of magnetic flux passing through the virtual magnetic pole P2 in the radial direction. It should be noted that the slit 23 does not necessarily have to be formed in the virtual magnetic pole P2.
  • the rotor core 20 has a gap 24 inside the magnet insertion hole 21 in the radial direction.
  • the gap portion 24 is provided to make the flow of magnetic flux inside the magnet insertion hole 21 in the radial direction uniform in the circumferential direction.
  • a protruding portion 20a protruding inward in the radial direction is formed in a portion of the inner circumference of the rotor core 20 in which the gap portion 24 is formed.
  • the protruding portion 20a functions as a rotation stopper for the rotor core 20 with respect to the resin portion 28 described below. However, it is not always necessary to form the protruding portion 20a on the inner circumference of the rotor core 20.
  • a non-magnetic resin portion 28 is provided between the shaft 26 and the rotor core 20.
  • the resin portion 28 connects the shaft 26 and the rotor core 20.
  • the resin portion 28 is formed of, for example, a thermoplastic resin such as PBT.
  • the resin portion 28 has a plurality of ribs connecting the annular inner cylinder portion 28a in contact with the outer circumference of the shaft 26, the annular outer cylinder portion 28c in contact with the inner circumference of the rotor core 20, and the inner cylinder portion 28a and the outer cylinder portion 28c. It has 28b and.
  • the shaft 26 penetrates the inner cylinder portion 28a of the resin portion 28 in the axial direction.
  • the ribs 28b are arranged at equal intervals in the circumferential direction, and extend radially outward from the inner cylinder portion 28a.
  • the number of ribs 28b is half the number of magnetic poles P, and the circumferential position of each rib 28b coincides with the polar center of the virtual magnetic pole P2.
  • the number and arrangement of the ribs 28b are not limited to the examples described here.
  • a sensor magnet 29 is arranged on the counterload side of the rotor core 20.
  • the sensor magnet 29 is held by the resin portion 28.
  • the magnetic field of the sensor magnet 29 is detected by a magnetic sensor mounted on the circuit board 55, whereby the rotational position of the rotor 2 is detected.
  • the shaft 26 may be fitted into the center hole of the rotor core 20 without providing the resin portion 28.
  • FIG. 5 is a vertical cross-sectional view showing the mold stator 4.
  • a heat radiating member 3 is provided on the opposite load side of the stator 5.
  • the heat radiating member 3 is made of, for example, metal, more specifically aluminum or copper.
  • the heat radiating member 3 has a flange portion 31, a leg portion 32, and fins 35.
  • the flange portion 31 is formed in an annular shape centered on the axis C1.
  • the leg portion 32 extends radially outward from the flange portion 31.
  • the fin 35 is formed inside the flange portion 31 in the radial direction.
  • the heat radiating member 3 also has a recess 36 on the stator 5 side.
  • the recessed portion 36 is a portion that accommodates the bearing 12 (FIG. 1).
  • the heat radiating member 3, the stator 5, and the circuit board 55 are integrally held by the mold resin portion 40 (FIG. 1) to form the mold stator 4.
  • the leg portion 32 of the heat radiating member 3 is covered with the mold resin portion 40.
  • the flange portion 31 and the fin 35 of the heat radiating member 3 are exposed from the mold resin portion 40.
  • FIG. 6A and 6 (B) are a plan view and a side view showing the mold stator 4.
  • the mold resin portion 40 has a plurality of mounting legs 45 arranged equidistant from the axis C1.
  • the four mounting legs 45 are formed at intervals of 90 degrees about the axis C1.
  • the number of mounting legs 45 is not limited to four.
  • the mounting leg 45 has a hole 46.
  • the hole 46 is a portion through which a screw 48 (FIG. 1) for fixing the motor 10 is inserted.
  • a plurality of leg portions 32 extend radially outward from the flange portion 31 of the heat radiating member 3.
  • the plurality of legs 32 are formed at equal distances from the axis C1 and at equal intervals about the axis C1.
  • the same number of leg portions 32 as the mounting legs 45 of the mold resin portion 40 are formed at positions corresponding to the mounting legs 45, respectively. That is, the four legs 32 are formed at intervals of 90 degrees about the axis C1.
  • a recess 33 is formed at the tip of the leg 32.
  • the recess 33 of the leg portion 32 is formed at a position where it vertically overlaps with the hole portion 46 of the mounting leg 45.
  • a plurality of fins 35 of the heat radiating member 3 are arranged in a direction orthogonal to the axis C1 (left-right direction in FIG. 6A).
  • Each fin 35 has a length in a direction orthogonal to the arrangement direction (vertical direction in FIG. 6A) and a height in the axial direction.
  • FIG. 7 is a front view showing the motor 10, the support plate 9, and the heat exchanger 7.
  • the support plate 9 has a mounting portion 93 to which the motor 10 is fixed at the center in the Z direction.
  • the mold resin portion 40 of the motor 10 is fixed to the mounting portion 93 by a screw 48 inserted through the mounting legs 45.
  • the mounting portion 93 may be formed with an arc-shaped frame portion 98 that surrounds the outer circumference of the mold resin portion 40.
  • the width of the support plate 9 in the X direction is narrower than the width of the heat exchanger 7 in the X direction. This is to reduce the ventilation resistance to the flow of air passing through the heat exchanger 7. Further, in order to reduce the ventilation resistance, both the upper and lower portions of the mounting portion 93 of the support plate 9 are composed of a pair of columnar portions 96 long in the Z direction.
  • FIG. 8 is a cross-sectional view showing a portion including the motor 10, the support plate 9, and the heat exchanger 7.
  • An opening 95 into which the mold resin portion 40 is inserted is formed in the mounting portion 93 of the support plate 9.
  • the mold resin portion 40 of the motor 10 is inserted into the opening 95 of the support plate 9 so that the heat radiating member 3 faces the heat exchanger 7.
  • the screw 48 penetrates the hole 46 formed in the mounting leg 45 of the mold resin portion 40 and the recess 33 formed in the leg 32 of the heat radiating member 3, and is formed in the screw portion 94 provided in the support plate 9. It is fixed. Therefore, the heat radiating member 3 and the screw 48 come into contact with each other, and the screw 48 and the support plate 9 come into contact with each other.
  • the screw 48 is made of a metal such as carbon steel. Further, as described above, the heat radiating member 3 is made of a metal such as aluminum, and the support plate 9 is made of a metal such as carbon steel. That is, the heat radiating member 3, the screw 48, and the support plate 9 are all made of metal and are in contact with each other.
  • the fin 35 of the heat radiating member 3 is exposed to the outside from the mold resin portion 40 as described above, and faces the heat exchanger 7.
  • the shortest distance from the heat exchanger 7 to the heat radiating member 3 is defined as the distance D1. More specifically, the distance D1 is the distance from the heat exchanger 7 to the end face of the fin 35 of the heat radiating member 3 on the heat exchanger 7 side.
  • the shortest distance from the heat exchanger 7 to the support plate 9 is defined as the distance D2. More specifically, the distance D2 is the distance from the heat exchanger 7 to the surface of the support plate 9 on the heat exchanger 7 side.
  • the distance D1 from the heat exchanger 7 to the heat radiating member 3 and the distance D2 from the heat exchanger 7 to the support plate 9 satisfy D1 ⁇ D2. That is, the heat radiating member 3 projects from the support plate 9 toward the heat exchanger 7.
  • the shortest distance from the heat exchanger 7 to the screw 48 is defined as the distance D3. More specifically, the distance D3 is the distance from the heat exchanger 7 to the end of the screw 48 on the heat exchanger 7 side.
  • the distance D1 from the heat exchanger 7 to the heat radiating member 3, the distance D2 from the heat exchanger 7 to the support plate 9, and the distance D3 from the heat exchanger 7 to the screw 48 satisfy D1 ⁇ D3 ⁇ D2. ..
  • FIG. 9 is a front view showing the heat exchanger 7.
  • the heat exchanger 7 has a plurality of fins 71 arranged in the X direction and long in the Z direction, and a heat transfer tube 72 penetrating the plurality of fins 71. A gap is formed between the fins 71 adjacent to each other in the X direction.
  • the fin 71 is made of, for example, aluminum, and the heat transfer tube 72 is made of, for example, copper. Heat exchange is performed between the refrigerant flowing in the heat exchanger 7 and the air passing through the heat exchanger 7.
  • FIG. 10A is a schematic diagram for explaining the flow of magnetic flux in the sequential pole type rotor 2.
  • FIG. 10B is a schematic diagram for explaining the flow of magnetic flux in the non-consequential pole type rotor 2A.
  • the sequential pole type rotor 2 has a magnet magnetic pole provided with the permanent magnet 25 and a virtual magnetic pole not provided with the permanent magnet 25. Since the virtual magnetic pole has a weak force for drawing magnetic flux, a magnetic flux that emerges from the permanent magnet 25 and flows outside the rotor core 20 in the axial direction or a magnetic flux that flows through the shaft 26 is generated. As a result, magnetic flux leakage occurs from the rotor core 20 to the outside in the axial direction.
  • Bearings 11 and 12 and a circuit board 55 are arranged so as to be axially adjacent to the rotor core 20. When magnetic flux flows through these members, heat is generated by electromagnetic induction as the rotor 2 rotates. Therefore, it is required to efficiently dissipate the heat of the motor 10.
  • the heat radiating member 3 is arranged on the heat exchanger 7 side with respect to the stator 5.
  • the heat exchanger 7 of the outdoor unit 100 operates as an evaporator, so that the temperature of the air passing through the heat exchanger 7 drops.
  • FIG. 11 is a schematic diagram for explaining the air flow generated by the rotation of the fan portion 6. As shown in FIG. 11, the rotation of the fan portion 6 causes an axial air flow to pass through the gap of the fins 71 (FIG. 9) of the heat exchanger 7.
  • the temperature of the air passing through the heat exchanger 7 drops because the heat of vaporization is taken away by the refrigerant in the heat exchanger 7.
  • the air whose temperature has dropped in this way is blown onto the heat radiating member 3.
  • the heat of the motor 10 can be efficiently dissipated from the heat radiating member 3.
  • the support plate 9 that supports the motor 10 occupies a certain area in the air passage, the ventilation resistance increases when the support plate 9 is brought close to the heat exchanger 7 as a whole. Therefore, it is desirable that the support plate 9 is arranged at a distance from the heat exchanger 7.
  • the distance D1 from the heat exchanger 7 to the heat radiating member 3 and the distance D2 from the heat exchanger 7 to the support plate 9 satisfy D1 ⁇ D2.
  • the heat radiating member 3 is projected from the support plate 9 toward the heat exchanger 7.
  • the heat radiating member 3 can be brought closer to the heat exchanger 7 to enhance the heat radiating effect, and the distance between the heat exchanger 7 and the support plate 9 can be widened to suppress an increase in ventilation resistance.
  • the distance D1 from the heat exchanger 7 to the heat radiating member 3 and the distance D2 from the heat exchanger 7 to the support plate 9 satisfy D2 / 2 ⁇ D1 ⁇ D2. In this way, both the effect of improving the heat dissipation effect and the effect of suppressing the increase in ventilation resistance can be easily obtained.
  • FIG. 12 is a schematic diagram for explaining the flow of heat around the heat radiating member 3.
  • the heat generated in the circuit board 55 or the bearing 12 due to the influence of the leakage flux of the rotor 2 flows to the heat radiating member 3 adjacent thereto.
  • a part of the heat flowing through the heat radiating member 3 flows toward the fins 35 as shown by the arrows in FIG. 12, and is radiated by the air blown from the heat exchanger 7 side to the heat radiating member 3. Since the heat radiating member 3 is made of a metal having high heat radiating properties such as aluminum and has fins 35 on the heat exchanger 7 side, heat can be radiated efficiently.
  • the other part of the heat that has flowed to the heat radiating member 3 flows from the leg portion 32 of the heat radiating member 3 to the screw 48, and further flows to the support plate 9.
  • the heat flowing through the support plate 9 is dissipated by the air from the heat exchanger 7 toward the fan portion 6, and also flows to the bottom plate 81 or the top plate 82 (FIG. 1) of the unit housing 8 and dissipates.
  • the screw 48 and the support plate 9 are all made of metal and are in contact with each other, heat easily flows through the heat radiating member 3, the screw 48 and the support plate 9.
  • the thermal conductivity of each member will be described.
  • the thermal conductivity T1 of the heat radiating member 3 is 190 to 250 W / m ⁇ K.
  • the support plate 9 is made of carbon steel having a carbon content of 0.1 to 0.4%
  • the thermal conductivity T2 of the support plate 9 is 30 to 70 W / m ⁇ K.
  • the screw 48 is made of carbon steel having a carbon content of 0.25% or less
  • the thermal conductivity T3 of the screw 48 is 60 to 100 W / m ⁇ K.
  • T1> T3> T2 is established between the thermal conductivity T1 of the heat radiating member 3, the thermal conductivity T2 of the support plate 9, and the thermal conductivity T3 of the screw 48.
  • the heat dissipation member 3 has the highest thermal conductivity
  • the screw 48 has the second highest thermal conductivity
  • the support plate 9 has the lowest thermal conductivity.
  • the heat of the heat radiating member 3 flows to the support plate 9 via the screw 48.
  • heat can easily flow in the order of the heat radiating member 3, the screw 48, and the support plate 9, and the heat radiating effect can be enhanced.
  • the distance D1 from the heat exchanger 7 to the heat radiating member 3, the distance D2 from the heat exchanger 7 to the support plate 9, and the distance D3 from the heat exchanger 7 to the screw 48 are D1 ⁇ D3 ⁇ D2. It is desirable to be satisfied.
  • the upstream side of the heat path is closer to the heat exchanger 7, and it is easily cooled by the flow of air passing through the heat exchanger 7. Thereby, the heat dissipation effect can be further enhanced.
  • FIG. 13 is a schematic view for explaining the exposed area of the heat radiating member 3 and the bracket 15.
  • a bracket 15 as a rotor holding member is attached to the stator 5 on the side opposite to the heat radiating member 3 in the axial direction.
  • the bracket 15 is fitted in a step portion 43 formed around the opening 41 of the mold resin portion 40 to support the bearing 11.
  • the bracket 15 is made of a metal such as a galvanized steel plate. Further, the bracket 15 is exposed to the outside from the mold resin portion 40. Therefore, the bracket 15 has a function of dissipating the heat generated in the bearing 11 due to the leakage flux from the rotor 2 to the outside of the motor 10.
  • the total area of the heat radiating member 3 exposed from the mold resin portion 40 is defined as the area A1.
  • the area A1 also includes the areas of the plurality of fins 35 of the heat radiating member 3.
  • the total area of the portion of the bracket 15 exposed from the mold resin portion 40 is defined as the area A2.
  • the bracket 15 is located on the downstream side of the mold stator 4 in the direction of the air flow generated by the rotation of the fan portion 6. Therefore, the flow rate of air passing through the bracket 15 is smaller than the flow rate of air passing through the heat radiating member 3. Therefore, when the area A1 of the exposed portion of the heat radiating member 3 is larger than the area A2 of the exposed portion of the bracket 15, the heat radiating effect can be enhanced.
  • the maximum dimension H1 from the axis C1 of the exposed portion of the heat radiating member 3 is longer than the maximum dimension H2 from the axis C1 of the exposed portion of the bracket 15. Therefore, as described above, it is possible to easily realize a configuration in which the area A1 of the exposed portion of the heat radiating member 3 is larger than the area A2 of the exposed portion of the bracket 15.
  • the thermal conductivity T4 of the bracket 15 is 30 to 70 W / m ⁇ K, which is the heat dissipation member 3.
  • Thermal conductivity is lower than T1 (190-250 W / m ⁇ K). Since the thermal conductivity of the heat radiating member 3 having a large amount of passing air is higher than the thermal conductivity of the bracket 15 having a small amount of passing air, the heat radiating effect can be further enhanced.
  • the outdoor unit 100 of the first embodiment is arranged on one side of the stator 5 in the axial direction, that is, the consequential pole type rotor 2, the stator 5 that surrounds the rotor 2 from the outside in the radial direction, and the stator 5.
  • It includes a motor 10 having a heat radiating member 3 and a heat exchanger 7 arranged so as to face the heat radiating member 3 in the axial direction. Since the heat radiating member 3 faces the heat exchanger 7, the air that has passed through the heat exchanger 7 and whose temperature has dropped can be blown onto the heat radiating member 3 to efficiently dissipate the heat of the motor 10 from the heat radiating member 3. can.
  • the support plate 9 for supporting the motor 10 is arranged at a distance in the axial direction from the heat exchanger 7, the support plate 9 is arranged in contact with the heat exchanger 7 as compared with the case where the support plate 9 is arranged in contact with the heat exchanger 7. Ventilation resistance can be reduced.
  • the motor while suppressing the increase in ventilation resistance.
  • the heat of 10 can be efficiently radiated from the heat radiating member 3.
  • the heat radiating member 3 is fixed to the support plate 9 by the screw 48 (fixing member), the heat radiating member 3 is in contact with the screw 48, and the screw 48 is in contact with the support plate 9, the heat of the heat radiating member 3 is dissipated. Heat can be efficiently dissipated through the screws 48 and the support plate 9.
  • the motor 10 has a mold resin portion 40 that covers the stator 5 and the heat radiating member 3, the stator 5 and the heat radiating member 3 can be integrally molded with the mold resin. Therefore, the manufacturing cost can be reduced as compared with the case where the heat radiating member 3 is fixed to the stator 5 with screws or the like.
  • the heat radiating member 3 the screw 48 and the support plate 9 are all made of metal, the heat of the heat radiating member 3 can be efficiently radiated through the screw 48 and the support plate 9.
  • the shortest distance D1 from the heat exchanger 7 to the heat radiating member 3, the shortest distance D2 from the heat exchanger 7 to the support plate 9, and the shortest distance D3 from the heat exchanger 7 to the screw 48 are D1 ⁇ D3. ⁇ Satisfy D2.
  • the upstream side of the heat path is closer to the heat exchanger 7, and therefore, it is easily cooled by the air that has passed through the heat exchanger 7, so that heat can be efficiently dissipated from the heat radiating member 3, the screw 48, and the support plate 9.
  • the thermal conductivity T1 of the heat radiating member 3, the thermal conductivity T2 of the support plate 9, and the thermal conductivity T3 of the screw 48 satisfy T1> T3> T2. Since the thermal conductivity is higher toward the upstream side of the heat path and therefore it is easily cooled, heat can be efficiently dissipated from the heat radiating member 3, the screw 48, and the support plate 9.
  • the fan portion 6 is arranged on the side opposite to the heat radiating member 3 with the stator 5 sandwiched in the axial direction, the air flowing from the heat exchanger 7 toward the fan portion 6 is used to dissipate heat.
  • the heat of the member 3 can be dissipated.
  • a bracket 15 (rotor holding member) is attached to the stator 5 on the side opposite to the heat radiating member 3 in the axial direction, and the thermal conductivity of the heat radiating member 3 is higher than the thermal conductivity of the bracket 15.
  • the total area A1 of the exposed surface of the heat radiating member 3 exposed to the outside of the motor 10 and the total area A2 of the exposed surface of the bracket 15 exposed to the outside of the motor 10 are A1> A2. I am satisfied.
  • FIG. 12 is a diagram showing a configuration of an air conditioner 200 to which the outdoor unit 100 of the first embodiment is applied.
  • the air conditioner 200 includes an outdoor unit 100, an indoor unit 201, and a refrigerant pipe 207 connecting them.
  • the indoor unit 201 has an indoor blower 202.
  • the indoor blower 202 has, for example, a blade 203 which is a cross-flow fan, a motor 204 for driving the blade 203, a heat exchanger 205 arranged to face the blade 203, and a housing 206 for accommodating the blade 203.
  • the outdoor unit 100 includes a blower 1, a compressor 101, a heat exchanger 7, and a decompression device (not shown).
  • the compressor 101, the heat exchanger 7, and the decompression device are connected together with the heat exchanger 205 of the indoor unit 201 by a refrigerant pipe 207 to form a refrigerant circuit.
  • the fan portion 6 is rotated by the rotation of the motor 10 of the blower 1, whereby the outdoor air passes through the heat exchanger 7.
  • the air passing through the heat exchanger 7 is deprived of the heat of vaporization and cooled.
  • the cooled air passes through the heat radiating member 3 of the motor 10 by the rotation of the fan portion 6, and is discharged to the outside through the opening 86 (FIG. 1) of the front panel 85.
  • the blade 203 is rotated by the rotation of the motor 204 of the indoor blower 202 to blow air into the room.
  • the air heated when the refrigerant is condensed in the heat exchanger 205 (condenser) is blown into the room by the blower of the indoor blower 202.
  • the heat of the motor 10 is efficiently dissipated by the air passing through the heat exchanger 7, so that the heating of the motor 10 can be suppressed.
  • stable operation of the blower 1 can be realized, and the reliability of the air conditioner 200 can be improved.
  • the motor 10 described here is an IPM (Inner Permanent Magnet) motor in which a permanent magnet 25 is embedded in a rotor 2, but even if it is an SPM (Surface Permanent Magnet) motor in which a permanent magnet 25 is attached to the surface of the rotor 2. good.
  • IPM Inner Permanent Magnet
  • SPM Surface Permanent Magnet

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Motor Or Generator Cooling System (AREA)
  • Other Air-Conditioning Systems (AREA)
  • Permanent Magnet Type Synchronous Machine (AREA)
PCT/JP2020/008002 2020-02-27 2020-02-27 室外機および空気調和装置 Ceased WO2021171471A1 (ja)

Priority Applications (6)

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CN202080097091.9A CN115135934A (zh) 2020-02-27 2020-02-27 室外机及空调装置
PCT/JP2020/008002 WO2021171471A1 (ja) 2020-02-27 2020-02-27 室外機および空気調和装置
EP20920857.8A EP4113022A4 (en) 2020-02-27 2020-02-27 Outdoor unit and air-conditioning device
AU2020431701A AU2020431701C1 (en) 2020-02-27 2020-02-27 Outdoor Unit and Air Conditioner
JP2022502704A JP7374293B2 (ja) 2020-02-27 2020-02-27 室外機および空気調和装置
US17/793,451 US20230035739A1 (en) 2020-02-27 2020-02-27 Outdoor unit and air conditioner

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AU2020431701A1 (en) 2022-09-15
CN115135934A (zh) 2022-09-30
EP4113022A1 (en) 2023-01-04
AU2020431701B2 (en) 2023-11-30
EP4113022A4 (en) 2023-03-29

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