CN220354041U - Scroll compressor and refrigerant cycle device - Google Patents

Abstract

Scroll compressor and refrigerant cycle device. In the scroll compressor, oil present in a space below the motor moves together with the refrigerant to a space above the motor, and may flow out of the scroll compressor together with the refrigerant from the discharge pipe. The scroll compressor is provided with a compression mechanism (15) for compressing a refrigerant, a motor (16) for driving the compression mechanism, and a gas guide (81). The gas guide guides the refrigerant discharged from the compression mechanism to a high-pressure space where the motor is disposed. The high-pressure space includes a first flow path (P1) and a second flow path (P2) between coils of the motor. The first flow path and the second flow path are located on the opposite side of the side where the gas guide is located with respect to the rotation axis of the rotor. At least one of the first flow path and the second flow path is covered with a lead wire (75) of the coil. The lead-out lines are configured to satisfy the relationship of 0.ltoreq.L2/L1.ltoreq.0.4 and 0.ltoreq.L4/L3.ltoreq.0.4.

Description

Scroll compressor and refrigerant cycle device

Technical Field

The present utility model relates to a scroll compressor and a refrigerant cycle device.

Background

As described in patent document 1 (japanese patent application laid-open No. 2003-286949), a scroll compressor is known in which a part of refrigerant discharged from a compression mechanism is guided from a space above the motor to a space below the motor for cooling the motor. In such a scroll compressor, the refrigerant flowing into the space below the motor changes direction in the space below the motor, flows again into the space above the motor, and finally flows out of the scroll compressor from the discharge pipe.

Patent document 1: japanese patent laid-open No. 2003-286949

Disclosure of Invention

In the scroll compressor, oil present in a space below the motor moves to a space above the motor together with the refrigerant, and may flow out of the scroll compressor together with the refrigerant from the discharge pipe.

The scroll compressor of the first aspect includes a compression mechanism that compresses a refrigerant, a motor that drives the compression mechanism, a housing, and a guide. The motor has a stator and a cylindrical rotor disposed inside the stator. The housing houses the compression mechanism and the motor. The guide guides the refrigerant discharged from the compression mechanism to the first space. The first space is a space inside the housing in which the motor is disposed. The stator has a cylindrical back yoke and a plurality of teeth. The teeth protrude radially from an inner peripheral surface of the back yoke. The motor also has an insulator, a coil, and an outgoing line. The coil is wound around the plurality of teeth via an insulator. The lead wires are led out from the ends of the coil. The first space has a second space. The second space is a space between an inner peripheral surface of the back yoke and an outer peripheral surface of the rotor when the motor is viewed along the rotation axis of the rotor. The second space includes a first flow path and a second flow path. The first flow path and the second flow path are located on a side opposite to a side on which the guide is located with respect to the rotation axis of the rotor when the motor is viewed along the rotation axis of the rotor. At least one of the first flow path and the second flow path is covered with a first member including the lead wire when the motor is viewed along the rotation axis of the rotor. The first member is configured to satisfy a relationship of 0.ltoreq.L2/L1.ltoreq.0.4 and 0.ltoreq.L4/L3.ltoreq.0.4. In these equations, the first dimension L1 is a dimension of the first flow path in the radial direction of the rotor. The second dimension L2 is a dimension of a portion of the first flow path not covered by the first member in the radial direction of the rotor. The third dimension L3 is a dimension of the second flow path in the radial direction of the rotor. The fourth dimension L4 is a dimension of a portion of the second flow path not covered by the first member in the radial direction of the rotor.

In the scroll compressor of the first aspect, the flow path through which the refrigerant easily flows upward is narrowed in the gap between the stator and the rotor, so that the outflow of oil to the outside of the compressor together with the refrigerant can be suppressed.

The scroll compressor of the second aspect is based on the scroll compressor of the first aspect, and the first member is configured to further satisfy a relationship of 0.6L 2/L4 1.3.

In the scroll compressor according to the second aspect, the plurality of flow paths through which the refrigerant easily flows upward, which are gaps between the stator and the rotor, are narrowed to the same extent, so that outflow of the oil to the outside of the compressor together with the refrigerant can be suppressed.

The scroll compressor of the third aspect is the scroll compressor of the first or second aspect, wherein the first member further includes a second member that is an insulating member covering the lead wire.

In the scroll compressor according to the third aspect, a component of the motor can be used to narrow a gap between the stator and the rotor, that is, a flow path through which the refrigerant easily flows upward.

The scroll compressor of the fourth aspect is the scroll compressor of any one of the first to third aspects, wherein the first member further includes a third member that is an insulating member that does not cover the lead wire.

In the scroll compressor according to the fourth aspect, an external member can be used to narrow a gap between the stator and the rotor, that is, a flow path through which the refrigerant easily flows upward.

A scroll compressor according to a fifth aspect is the scroll compressor according to any one of the first to fourth aspects, wherein the first member is fixed to the insulator by the fourth member.

In the scroll compressor according to the fifth aspect, by fixing the member for narrowing the flow path for the refrigerant that is the gap between the stator and the rotor to flow upward easily to the motor, the change in the cross-sectional area of the flow path during operation can be suppressed.

The refrigerant cycle device according to the sixth aspect includes the scroll compressor according to any one of the first to fifth aspects.

In the refrigerant cycle device according to the sixth aspect, outflow of oil to the outside of the compressor together with the refrigerant is suppressed.

Drawings

Fig. 1 is a longitudinal sectional view of a scroll compressor 101 according to an embodiment.

Fig. 2 is a plan view of the stator 51.

Fig. 3 is a longitudinal sectional view of the stator 51 at line III-III of fig. 2.

Fig. 4 is a plan view of the stator core 71.

Fig. 5 is a top view of insulator 72.

Fig. 6 is a perspective view of a part of the insulator 72 attached to the upper end surface 71a of the stator core 71.

Fig. 7 is a perspective view of a part of the stator 51.

Fig. 8 is a diagram showing the connection states of the coils C1 to C12.

Fig. 9 is a front view of the gas guide 81.

Fig. 10 is a top view of the gas guide 81. Is a view seen from the direction of arrow X shown in fig. 9. Is a view showing a cross section of the main body housing 11 to which the gas guide 81 is attached.

Fig. 11 is a top view of the motor 16. Is a view of the motor 16 viewed from above along the rotation axis 52a of the rotor 52. Is a diagram showing the positions of the gas guide 81 and the discharge pipe 20.

Fig. 12 is an enlarged view of fig. 11. An enlarged view of the surroundings of the first channel P1 and the second channel P2 is shown.

Fig. 13 is a top view of the motor 16. Is a diagram showing the insulating cap 92.

Fig. 14 is a front view of the insulating cap 92.

Fig. 15 is a side view of the insulating cap 92. Is a view as seen from the direction of arrow XV shown in fig. 14.

Fig. 16 is a top view of the motor 16. Is a diagram showing the insulating spacers 93.

Description of the reference numerals

10 outer casing

15 compression mechanism

16 motor

51 stator

52 rotor

52a axis of rotation

54 air gap (second space)

71d back yoke

71e tooth

72 insulator

75 leading-out wire

81 gas guide (guide)

92 insulating cap (second component)

93 insulating spacer (third component)

94 belt (fourth component)

101 scroll compressor

C1-C12 coil

S1 high pressure space (first space)

SL1 to SL12 groove (second space)

P1 first flow path

P2 second flow path

R1 radial direction

Detailed Description

(1) Integral structure

The scroll compressor 101 of the embodiment is provided in a refrigerant cycle device. The refrigerant cycle device has a refrigerant circuit in which a refrigerant circulates. In the refrigerant cycle device, a refrigeration cycle is repeated in which the refrigerant in the refrigerant circuit is compressed, condensed (released heat), decompressed, evaporated (absorbed heat), and then compressed again. The scroll compressor 101 compresses a gas refrigerant flowing in a refrigerant circuit.

The scroll compressor 101 compresses a refrigerant by changing the volume of a space formed by 2 scroll members having mutually meshed spiral wraps. As shown in fig. 1, the scroll compressor 101 includes a housing 10, a compression mechanism 15, a casing 23, a motor 16, a lower bearing 60, a crankshaft 17, a gas guide 81, a suction pipe 19, and a discharge pipe 20.

(2) Detailed structure

(2-1) the housing 10

The housing 10 is composed of a substantially cylindrical main body housing portion 11, a bowl-shaped upper wall portion 12 hermetically welded to an upper end portion of the main body housing portion 11, and a bowl-shaped bottom wall portion 13 hermetically welded to a lower end portion of the main body housing portion 11. The case 10 is formed of a rigid member which is less likely to be deformed or broken when the internal and external pressures and temperatures of the case 10 change. The housing 10 is arranged to: the substantially cylindrical axial direction of the main body housing 11 is along the vertical direction. The vertical direction is indicated by an arrow U in fig. 1.

The housing 10 accommodates therein a compression mechanism 15, a casing 23 disposed below the compression mechanism 15, a motor 16 disposed below the casing 23, a crankshaft 17 disposed so as to extend in the vertical direction, and the like. A suction pipe 19 and a discharge pipe 20 are hermetically welded to the wall of the housing 10.

An oil reservoir 10a is formed at the bottom of the housing 10, and the oil reservoir 10a is a space for storing lubricating oil. The lubricating oil is used to maintain the lubricity of the sliding parts such as the compression mechanism 15 well during the operation of the scroll compressor 101.

(2-2) compression mechanism 15

The compression mechanism 15 sucks and compresses a low-temperature and low-pressure refrigerant gas, and discharges a high-temperature and high-pressure refrigerant gas (hereinafter referred to as "compressed refrigerant"). The compression mechanism 15 has a fixed scroll 24 and a movable scroll 26.

The fixed scroll 24 has a first end plate 24a and an involute-shaped first wrap 24b formed upright on the first end plate 24 a. A main suction hole (not shown) is formed in the fixed scroll 24. The main suction hole communicates the suction pipe 19 with a compression chamber 40 described later. A discharge hole 41 is formed in a central portion of the first end plate 24 a. The fixed scroll 24 is formed with a first compressed refrigerant flow path 46, and the first compressed refrigerant flow path 46 communicates with the discharge hole 41 and opens at the lower surface of the fixed scroll 24.

The movable scroll 26 has a second end plate 26a and an involute-shaped second scroll wrap 26b formed upright on the second end plate 26 a. An upper end bearing 26c is formed in the center of the lower surface of the second end plate 26 a. An oil supply hole 63 is formed in the second end plate 26 a. The oil supply hole 63 communicates the upper surface outer peripheral portion of the second end plate 26a with the space inside the upper end bearing 26c.

The fixed scroll 24 and the movable scroll 26 form a compression chamber 40 by the engagement of the first wrap 24b with the second wrap 26b. The compression chamber 40 is a space surrounded by the first end plate 24a, the first scroll wrap 24b, the second end plate 26a, and the second scroll wrap 26b. The volume of the compression chamber 40 is changed by the orbital motion of the movable scroll 26. In the revolution of the movable scroll 26, the lower surfaces of the first end plate 24a and the first wrap 24b of the fixed scroll 24 slide with the upper surfaces of the second end plate 26a and the second wrap 26b of the movable scroll 26.

(2-3) housing 23

The housing 23 is disposed below the compression mechanism 15. The outer peripheral surface of the case 23 is hermetically joined to the inner surface of the housing 10. Thereby, the internal space of the casing 10 is divided into a high-pressure space S1 below the casing 23 and a low-pressure space S2 that is a space above the casing 23. The housing 23 carries the fixed scroll 24, and sandwiches the movable scroll 26 with the fixed scroll 24 via the oldham coupling 39. The oldham coupling 39 is an annular member for preventing the rotation movement of the movable scroll 26. A second compressed refrigerant flow path 48 is formed in the outer peripheral portion of the casing 23 so as to penetrate in the vertical direction. The second compressed refrigerant flow path 48 communicates with the first compressed refrigerant flow path 46 at the upper surface of the casing 23, and communicates with the high-pressure space S1 at the lower surface of the casing 23.

A crank chamber 23a is recessed in the upper surface of the housing 23. The case 23 has a case through hole 31. The case through hole 31 penetrates the case 23 in the vertical direction from the bottom surface center portion of the crank chamber 23a to the lower surface center portion of the case 23. Hereinafter, a portion of the housing 23 in which the housing through hole 31 is formed will be referred to as an upper bearing 32.

(2-4) Motor 16

The motor 16 is a brushless DC motor disposed below the housing 23. The motor 16 includes a stator 51 fixed to the inner surface of the casing 10, and a rotor 52 disposed inside the stator 51 so as to provide an air gap 54. The motor 16 is a concentrated winding motor having 12 concentrated winding coils, and is a variable speed motor driven by inverter control. The motor 16 is a three-phase motor having a U-phase, a V-phase, and a W-phase. The motor 16 drives the compression mechanism 15.

(2-4-1) stator 51

A plurality of core cutting portions cut at predetermined intervals in the circumferential direction from the upper end surface to the lower end surface of the stator 51 are provided on the outer peripheral surface of the stator 51. The core cut portion forms a motor cooling passage 55, and the motor cooling passage 55 extends in the vertical direction between the main body portion housing portion 11 and the stator 51. As shown in fig. 2 and 3, the stator 51 includes a stator core 71, a pair of insulators 72, and a winding 73. The winding 73 is an electrical conductor such as a copper wire.

The stator core 71 is a member in which a plurality of annular plates made of electromagnetic steel are laminated. An insulator 72 is attached to each of the upper end face 71a and the lower end face 71b of the stator core 71, and the insulator 72 is a resin insulator.

As shown in fig. 4, the stator core 71 has a cylindrical back yoke 71d and 12 teeth 71e protruding in the radial direction from the inner peripheral surface of the back yoke 71 d. The 12 teeth 71e are arranged at angular intervals of 30 degrees in the circumferential direction of the back yoke 71 d. 12 core cut portions 71c are formed on the outer peripheral surface of the stator core 71.

As shown in fig. 5, the insulator 72 has a cylindrical portion 72a in contact with the back yoke 71d and 12 protruding portions 72b in contact with the teeth 71e. The protruding portion 72b is a portion protruding in the radial direction from the inner peripheral surface of the cylindrical portion 72a. The 12 protruding portions 72b are arranged at angular intervals of 30 degrees in the circumferential direction of the cylindrical portion 72a.

As shown in fig. 2, 6 and 7, the stator 51 includes coils C1 to C12 formed by winding the windings 73 around the teeth 71e via the insulators 72. The number of coils C1 to C12 is the same as the number of teeth 71e. As shown in fig. 2, 12 coils C1 to C12 are arranged at angular intervals of 30 degrees along the circumferential direction of the back yoke 71 d.

The stator 51 has slots SL1 to SL12, and the slots SL1 to SL12 are spaces between 2 coils C1 to C12 adjacent to each other in the circumferential direction of the back yoke 71 d. The number of slots SL1 to SL12 is the same as the number of coils C1 to C12. As shown in fig. 2, 12 slots SL1 to SL12 are arranged at angular intervals of 30 degrees in the circumferential direction of the back yoke 71 d. For example, as shown in fig. 7, the slot SL1 is a space between the coil C1 and the coil C2.

The 12 coils C1 to C12 have: 4 coils C1, C4, C7, C10 of the motor 16 forming a U phase; 4 coils C2, C5, C8, C11 of the motor 16 forming V-phase; and 4 coils C3, C6, C9, C12 of the motor 16 forming W phase. The 4 coils forming each phase are formed by winding the windings 73 around 4 teeth 71e arranged at angular intervals of 90 degrees in the circumferential direction of the back yoke 71d, respectively. As shown in fig. 8, 4 coils forming each phase are connected in parallel.

The lead wires 75 extend from both ends of the winding 73 wound around the respective coils C1 to C12. The lead wire 75 is part of the winding 73. As shown in fig. 8, one of the pair of lead wires 75 extending from the coils C1 to C12 is a power supply wire 76, and the other is a neutral wire 77.

The power supply line 76 is connected to a power supply for supplying exciting current to the coils C1 to C12. The power supply line 76 extending from the 4 coils C1, C4, C7, C10 forming the U-phase of the motor 16 is connected to the power supply terminal 79a of the U-phase. The power supply line 76 extending from the 4 coils C2, C5, C8, C11 forming the V-phase of the motor 16 is connected to the V-phase power supply terminal 79 b. The power supply line 76 extending from the 4 coils C3, C6, C9, C12 forming the W-phase of the motor 16 is connected to the W-phase power supply terminal 79C. The 3 power terminals 79a, 79b, 79c are mounted on the housing 10 and connected to an external power source (not shown).

The neutral wires 77 extending from the respective coils C1 to C12 are connected to each other at a neutral point 78. In other words, at the neutral point 78, all the neutral wires 77 are electrically connected.

The lead wires 75 are covered with an insulating member so as not to be electrically connected to each other except the power supply terminals 79a, 79b, 79c and the neutral point 78. The insulating member is formed of an electrically insulating polyester film or the like.

The lead wire 75 is locked to the insulator 72, and the insulator 72 is attached to the upper end surface 71a of the stator core 71. Specifically, the lead wires 75 are arranged above the coils C1 to C12 and the slots SL1 to SL12 so as to extend along the circumferential direction of the cylindrical portion 72a of the insulator 72, and are fixed to the cylindrical portion 72a by a member such as a tape at a plurality of positions.

(2-4-2) rotor 52

The rotor 52 has a cylindrical shape. The rotor 52 is coupled to the crankshaft 17. The rotor 52 rotates around a rotation axis 52a parallel to the vertical direction by rotation of the crankshaft 17. The rotor 52 is connected to the compression mechanism 15 via the crankshaft 17.

As shown in fig. 1, the rotor 52 has a plurality of wind holes 52b penetrating the rotor 52 in the vertical direction. The air hole 52b communicates the high-pressure space S1 above the motor 16 with the high-pressure space S1 below the motor 16. When the rotor 52 is viewed in the vertical direction, the wind holes 52b are arranged at equal intervals along the circumferential direction of the rotor 52.

(2-5) lower bearing 60

The lower bearing 60 is disposed below the motor 16. The outer peripheral surface of the lower bearing 60 is engaged with the inner peripheral surface of the housing 10. The lower bearing 60 supports the crankshaft 17.

(2-6) crankshaft 17

The crankshaft 17 is disposed such that the longitudinal direction of the crankshaft 17 is along the vertical direction. The crankshaft 17 has the following shape: the axial center of the upper end portion of the crankshaft 17 is slightly eccentric with respect to the axial center of the portion other than the upper end portion.

The crankshaft 17 is coupled to the rotor 52 so as to penetrate the rotor 52 in the vertical direction along the rotation axis 52a of the rotor 52. An upper end portion of the crankshaft 17 is fitted into the upper end bearing 26c, whereby the crankshaft 17 is connected to the movable scroll 26. The crankshaft 17 is supported by an upper bearing 32 and a lower bearing 60.

The crankshaft 17 has a main oil supply path 61 extending in the vertical direction therein. The upper end of the main oil supply path 61 communicates with an oil chamber 83 formed by the upper end surface of the crankshaft 17 and the lower surface of the second end plate 26 a. The oil chamber 83 communicates with the compression chamber 40 via the oil supply fine hole 63 formed in the second end plate 26 a. The lower end of the main oil supply path 61 communicates with the oil reservoir 10a of the high-pressure space S1.

The crankshaft 17 has a first sub oil supply passage 62a, a second sub oil supply passage 62b, and a third sub oil supply passage 62c that branch from the main oil supply passage 61. The first, second and third sub oil supply passages 62a, 62b, 62c extend in the horizontal direction. The first sub oil supply passage 62a opens at a sliding surface of the crankshaft 17 and the upper end bearing 26c of the movable scroll 26. The second sub oil supply passage 62b opens at the sliding surface of the crankshaft 17 and the upper bearing 32 of the housing 23. The third sub oil supply passage 62c opens at the sliding surface of the crankshaft 17 and the lower bearing 60.

(2-7) gas guide 81

The gas guide 81 is fixed to the inner surface of the main body portion 11 of the casing 10 by spot welding or the like in the high-pressure space S1. The gas guide 81 is formed of a metal plate. The gas guide 81 forms a refrigerant guide flow path 82 along with the inner surface of the casing 10 for the flow of the compressed refrigerant compressed by the compression mechanism 15. The upper end of the refrigerant guide flow path 82 communicates with the second compressed refrigerant flow path 48 of the housing 23. The arrows of the broken lines shown in fig. 9 and 10 indicate the flow of the compressed refrigerant through the refrigerant guide flow path 82.

The gas guide 81 is a member in which a horizontal guide portion 81a and a vertical guide portion 81b are integrally formed. The horizontal guide portion 81a is in close contact with the inner surface of the housing 10, and a horizontal flow path 82a, which is a space between the horizontal guide portion 81a and the inner surface of the housing 10, is formed. As shown in fig. 9, the horizontal guide portion 81a has a shape in which a central portion in the vertical direction is convexly curved toward the inside of the housing 10.

The vertical guide 81b is in close contact with the inner surface of the housing 10, and a vertical flow path 82b is formed as a space between the vertical guide 81b and the inner surface of the housing 10. As shown in fig. 10, the vertical guide 81b has a shape in which a horizontal central portion is convexly curved toward the inside of the housing 10. The horizontal center of the vertical guide 81b is located closer to the inner surface of the housing 10 from above to below. In other words, the horizontal cross-sectional area of the vertical flow path 82b gradually decreases from the upper side to the lower side. The vertical flow path 82b communicates with the horizontal flow path 82a at a central portion in the vertical direction.

(2-8) suction pipe 19

The suction pipe 19 is a pipe for introducing the refrigerant of the refrigerant circuit from the outside of the casing 10 to the compression mechanism 15. The suction pipe 19 is hermetically fitted into the upper wall 12 of the housing 10. The suction pipe 19 penetrates the low-pressure space S2 in the vertical direction. The end of the suction tube 19 within the housing 10 is embedded in a fixed scroll 24.

(2-9) discharge tube 20

The discharge pipe 20 is a pipe for discharging the compressed refrigerant from the high-pressure space S1 to the outside of the casing 10. The discharge tube 20 is hermetically fitted into the main body portion 11 of the housing 10. The discharge pipe 20 penetrates the high-pressure space S1 in the horizontal direction. An opening 20a of the discharge pipe 20 located in the housing 10 is located near the casing 23 in the vertical direction.

(3) Operation of scroll compressor 101

(3-1) flow of refrigerant

When the motor 16 is started and the rotor 52 rotates about the rotation axis 52a, the crankshaft 17 coupled to the rotor 52 rotates. The rotational motion of the crankshaft 17 is transmitted to the movable scroll 26 via the upper end bearing 26c. The axial center of the upper end portion of the crankshaft 17 is eccentric with respect to the axial center of the rotational movement of the crankshaft 17. The movable scroll 26 is prevented from rotating by an oldham coupling 39. Therefore, the movable scroll 26 does not rotate but performs an orbital motion with respect to the fixed scroll 24.

The low-temperature low-pressure refrigerant is supplied from the suction pipe 19 to the compression chamber 40 of the compression mechanism 15 via the main suction hole. By the orbital motion of the movable scroll 26, the compression chamber 40 moves from the outer peripheral portion toward the central portion of the fixed scroll 24 while gradually decreasing the volume. As a result, the refrigerant in the compression chamber 40 is compressed to become a compressed refrigerant. After being discharged from the discharge hole 41, the compressed refrigerant is supplied to a refrigerant guide passage 82 formed by the gas guide 81 via the first compressed refrigerant passage 46 and the second compressed refrigerant passage 48.

The compressed refrigerant supplied to the refrigerant guide flow path 82 is sent to the high-pressure space S1 through the horizontal flow path 82a and the vertical flow path 82b. The compressed refrigerant having passed through the horizontal flow path 82a gradually flows downward while flowing in the circumferential direction of the casing 10 in the high-pressure space S1 above the motor 16. Specifically, the compressed refrigerant having passed through the horizontal flow path 82a descends through a part of the motor cooling passage 55, a part of the grooves SL1 to SL12, and the air gap 54 of the motor 16, and reaches the high-pressure space S1 below the motor 16. The compressed refrigerant passing through the vertical flow path 82b descends in the motor cooling passage 55 located below the vertical flow path 82b, and reaches the high-pressure space S1 below the motor 16.

After reversing the flow direction of the compressed refrigerant reaching the high-pressure space S1 below the motor 16, the compressed refrigerant rises in a part of the motor cooling passage 55, a part of the grooves SL1 to SL12, the air hole 52b of the rotor 52, and the air gap 54 of the motor 16. After that, the compressed refrigerant reaches the high-pressure space S1 above the motor 16, and is discharged from the discharge pipe 20 to the outside of the scroll compressor 101.

(3-2) flow of lubricating oil

While the refrigerant is compressed in the compression chamber 40 of the compression mechanism 15, the lubricating oil of the oil reservoir 10a is supplied to the main oil supply path 61 by the pressure difference between the high-pressure space S1 and the compression chamber 40. The lubricating oil supplied to the main oil supply passage 61 rises toward the oil chamber 83 in the main oil supply passage 61.

The lubricating oil rising in the main oil supply passage 61 is branched to the third sub oil supply passage 62c, the second sub oil supply passage 62b, and the first sub oil supply passage 62a in this order. The lubricating oil flowing through the third sub oil supply passage 62c lubricates the sliding surfaces of the crankshaft 17 and the lower bearing 60, and thereafter is supplied to the high-pressure space S1 and returned to the oil reservoir 10a. The lubricating oil flowing through the second sub oil supply passage 62b lubricates the sliding surface of the crankshaft 17 and the upper bearing 32 of the housing 23, and then is supplied to the high-pressure space S1 and the crank chamber 23a. The lubricating oil supplied to the high-pressure space S1 returns to the oil reservoir 10a. The lubricating oil supplied to the crank chamber 23a is supplied to the high-pressure space S1 via an oil return passage (not shown) of the casing 23, and returned to the oil reservoir 10a. The lubricating oil flowing through the first sub oil supply passage 62a lubricates the sliding surface between the crankshaft 17 and the upper end bearing 26c of the movable scroll 26, and thereafter is supplied to the crank chamber 23a. The lubricating oil supplied to the crank chamber 23a is supplied to the high-pressure space S1 via the oil return passage, and returned to the oil reservoir 10a. The lubricating oil reaching the oil chamber 83 flows through the oil supply hole 63 and is supplied to the compression chamber 40.

The compressed refrigerant passing through the horizontal flow path 82a gradually flows downward while flowing along the circumferential direction of the casing 10. Therefore, minute oil droplets of the lubricating oil contained in the compressed refrigerant after passing through the horizontal flow path 82a splash toward the casing 10 due to centrifugal force. The oil droplets splashed by the centrifugal force adhere to the inner peripheral surface of the housing 10, fall by their own weight, and return to the oil reservoir 10a. In other words, the gas guide 81 causes a part of the compressed refrigerant to flow along the circumferential direction of the casing 10, thereby removing the lubricating oil from the compressed refrigerant.

(4) Detailed structure of lead-out wire 75

The high-pressure space S1 inside the housing 10 includes the air gap 54 of the motor 16 and the slots SL1 to SL12. As shown in fig. 11, the air gap 54 and the grooves SL1 to SL12 correspond to a space between the inner peripheral surface of the back yoke 71d of the stator 51 and the outer peripheral surface of the rotor 52 when the motor 16 is viewed along the rotation axis 52a of the rotor 52. The rotor 52 has 8 wind holes 52b arranged at equal intervals in the circumferential direction when viewed along the rotation axis 52 a. The slots SL1-SL 12 have substantially the same shape and size when the motor 16 is viewed along the rotation axis 52 a.

In fig. 11, the motor cooling passage 55 located below the vertical flow path 82b formed by the gas guide 81 and the main body housing portion 11 is shown as a guide side passage 55a. The compressed refrigerant passing through the vertical flow path 82b flows downward through the guide-side passage 55a, and reaches the high-pressure space S1 below the motor 16.

In fig. 11, 2 grooves SL6 and SL7 of the 12 grooves SL1 to SL12 located on the opposite side of the guide-side passage 55a with respect to the rotation axis 52a of the rotor 52 are indicated as a first flow path P1 and a second flow path P2. In other words, the first flow path P1 and the second flow path P2 are the groove SL6 and the groove SL7, respectively, which are located on the opposite side of the gas guide 81 with respect to the rotation axis 52a when the motor 16 is viewed along the rotation axis 52 a. The gas guide 81 is located outside the coil C1 when the motor 16 is viewed along the rotation axis 52 a. Therefore, the gas guide 81 has grooves SL1, SL12 on both sides of the coil C1 with respect to the rotation axis 52a on the side thereof. The first flow path P1 is a groove SL6 located on the opposite side of the groove SL12 with respect to the rotation axis 52 a. The second flow path P2 is a groove SL7 located on the opposite side of the groove SL1 with respect to the rotation axis 52 a. The slot SL6 is a space between the coil C6 and the coil C7. The slot SL7 is a space between the coil C7 and the coil C8.

The grooves SL6 and SL7 are spaces in which the compressed refrigerant easily flows upward from the high-pressure space S1 below the motor 16 toward the high-pressure space S1 above the motor 16. The compressed refrigerant that has reached the high-pressure space S1 below the motor 16 through the guide-side passage 55a reverses the flow direction. At this time, the compressed refrigerant whose flow direction is reversed easily flows into the grooves SL6 and SL7 farthest from the guide-side passage 55a among the 12 grooves SL1 to SL12 when the motor 16 is viewed along the rotation axis 52 a.

The lead wire 75 is disposed above the coils C1 to C12 and the slots SL1 to SL12 so as to extend along the circumferential direction of the cylindrical portion 72a of the insulator 72. Therefore, when the motor 16 is viewed from above along the rotation axis 52a, a part of the grooves SL1 to SL12 is covered with the lead wires 75. As shown in fig. 12, the lead wire 75 is bound to the cylindrical portion 72a of the insulator 72 via a tape 94. Therefore, the lead wire 75 is fixed to the insulator 72 so as to contact the inner peripheral surface of the cylindrical portion 72a. Therefore, when the motor 16 is viewed along the rotation axis 52a, the lead wire 75 covers the outer portions of the grooves SL1 to SL12 in the radial direction R1 of the rotor 52. As shown in fig. 11, the radial direction R1 of the rotor 52 is a radial direction of the circular end surface of the rotor 52 when the rotor 52 is viewed along the rotation axis 52 a. The circumferential direction R2 of the rotor 52 is a circumferential direction of the circular end surface of the rotor 52 when the rotor 52 is viewed along the rotation axis 52 a.

As shown in fig. 12, the first channel P1 (slot SL 6) and the second channel P2 (slot SL 7) are covered with the lead wire 75. The dimensions L1 to L4 shown in fig. 12 are dimensions of the radial direction R1 when the rotor 52 is viewed along the rotation axis 52a, and are defined as follows.

First dimension L1: is the size of the first flow path P1. The range of the first dimension L1 is the same as the range of the coils C6 and R1 in the radial direction of the coils C7 on both sides of the slot SL6.

Second dimension L2: is the size of a portion of the first flow path P1 that is not covered by the lead wire 75. The second dimension L2 occupies a range that is a fraction of the range occupied by the first dimension L1.

Third dimension L3: is the size of the second flow path P2. The range of the third dimension L3 is the same as the range of the coil C7 on both sides of the slot SL7 and the radial direction R1 of the coil C8.

Fourth dimension L4: is the size of a portion of the second flow path P2 that is not covered by the lead wire 75. The fourth dimension L4 occupies a range that is a fraction of the range occupied by the third dimension L3.

The lead wire 75 is configured to satisfy the following two formulas (I) and (II).

Formula (I): L2/L1 is more than or equal to 0 and less than or equal to 0.4

Formula (II): L4/L3 is more than or equal to 0 and less than or equal to 0.4

The expression (I) means that "the first flow path P1 has a portion covered by at least 60% of the lead wires 75 in the radial direction R1".

The expression (II) means that "the second flow path P2 has a portion covered by at least 60% of the lead wires 75 in the radial direction R1".

When the dimensions L1 to L4 are not constant in the circumferential direction R2, the dimensions L1 to L4 may be defined as follows, as long as the dimensions R1 are the radial directions R1 when the rotor 52 is viewed along the rotation axis 52 a.

First dimension L1: is the maximum value of the size of the first flow path P1.

Second dimension L2: is the maximum value of the size of the portion of the first flow path P1 that is not covered by the lead wire 75.

Third dimension L3: is the maximum value of the size of the second flow path P2.

Fourth dimension L4: is the maximum value of the dimension of the portion of the second flow path P2 that is not covered by the lead wire 75.

In this case, the expression (I) means that "at least 60% of the sectional area of the first flow path P1 is covered with the lead-out wire 75", and the expression (II) means that "at least 60% of the sectional area of the second flow path P2 is covered with the lead-out wire 75". The cross-sectional areas of the first and second flow paths P1 and P2 correspond to the areas of the areas occupied by the first and second flow paths P1 and P2, respectively, when the motor 16 is viewed along the rotation axis 52 a.

(5) Features (e.g. a character)

(5-1)

In the scroll compressor 101, the lead wires 75 extending from the coils C1 to C12 of the motor 16 are arranged so as to cover the grooves SL1 to SL12 that are gaps between the coils C1 to C12. Specifically, the upper end portions of the groove SL6 (the first flow path P1) and the groove SL7 (the second flow path P2) in which the compressed refrigerant easily flows upward among the 12 grooves SL1 to SL12 are covered with the lead wire 75. As a result, a part of the compressed refrigerant flowing upward in the grooves SL6 and SL7 collides with the lead wire 75, and therefore, the amount of the compressed refrigerant passing upward through the grooves SL6 and SL7 is reduced by the lead wire 75. Therefore, the passage of the lubricating oil contained in the compressed refrigerant in the high-pressure space S1 below the motor 16 through the grooves SL6 and SL7 can be suppressed.

As shown in fig. 11, the opening 20a of the discharge pipe 20 in the housing 10 is located on the side substantially opposite to the side on which the gas guide 81 is located with respect to the rotation axis 52a, like the grooves SL6 and SL7. Therefore, the lubricating oil passing upward through the grooves SL6 and SL7 easily flows into the discharge pipe 20 from the opening 20a, and is discharged to the outside of the scroll compressor 101. In the scroll compressor 101, the groove SL6 and the groove SL7 are covered with the lead wire 75, whereby the passage of the lubricating oil through the groove SL6 and the groove SL7 is suppressed. Thus, in the scroll compressor 101, the lead wire 75 suppresses the occurrence of oil rising in which lubricating oil flows out of the scroll compressor 101 together with compressed refrigerant.

(5-2)

In the scroll compressor 101, the lead wire 75 is configured to satisfy the above-described 2 formulas (I) and (II). Thus, the area of the region not covered by the lead wire 75 in the region occupied by the slots SL6 and SL7 when the motor 16 is viewed along the rotation axis 52a can be limited to a predetermined value or less. Accordingly, in the scroll compressor 101, the amount of lubricating oil passing through the grooves SL6 and SL7 is limited by the lead-out line 75, and therefore, the occurrence of oil rising can be suppressed.

(5-3)

In the scroll compressor 101, the lead wire 75 is bound and fixed to the cylindrical portion 72a of the insulator 72 via the band 94. Therefore, the compressed refrigerant passing through the grooves SL1 to SL12 collides with the lead wire 75, and the positional change of the lead wire 75 is suppressed. This suppresses an increase in the area of the region not covered by the lead wire 75, out of the regions occupied by the grooves SL6 and SL7, due to the movement of the lead wire 75 during the operation of the scroll compressor 101. In this case, the amount of lubricating oil passing through the grooves SL6 and SL7 may increase. Thus, in the scroll compressor 101, by fixing the lead wire 75 to the insulator 72, the occurrence of oil rising can be suppressed.

(6) Modification examples

(6-1) modification A

In the scroll compressor 101, the lead wire 75 may be configured to also satisfy the following expression (III).

Formula (III): L2/L4 is more than or equal to 0.6 and less than or equal to 1.3

The expression (III) means that "the dimensions of the portions of the first flow path P1 and the second flow path P2 not covered with the lead wire 75 are the same in the radial direction R1". In addition, when the radial direction R1 of the portion not covered with the lead wire 75 is substantially uniform in the circumferential direction R2, the expression (III) means that the areas of the portions of the first flow path P1 and the second flow path P2 not covered with the lead wire 75 are the same.

The groove SL6 (the first flow path P1) and the groove SL7 (the second flow path P2) of the 12 grooves SL1 to SL1 are spaces in which the compressed refrigerant easily flows upward. In the present modification, the lead wires 75 are arranged as follows: when the motor 16 is viewed along the rotation axis 52a, the areas of the areas not covered by the lead wires 75 are the same among the areas occupied by the grooves SL6 and SL7. Thus, the flow rate of the compressed refrigerant passing upward through the grooves SL6 and SL7 is the same. The greater the difference between the flow rate of the compressed refrigerant passing through the tank SL6 and the flow rate of the compressed refrigerant passing through the tank SL7, the more likely an oil rise of the lubricating oil contained in the compressed refrigerant passing through the tanks SL6 and SL7 occurs. Therefore, in the scroll compressor 101, by disposing the lead wires 75 so as to satisfy the above formula (III), the occurrence of oil rising can be suppressed.

In the present modification, the lead wires 75 may be arranged so that the areas of the areas not covered by the lead wires 75 among the areas occupied by the grooves SL1 to SL12 are as uniform as possible when the motor 16 is viewed along the rotation axis 52 a. Thus, when the motor 16 is viewed along the rotation axis 52a, the areas of the areas not covered by the lead wires 75 in the areas occupied by the grooves SL1 to SL12 are the same, and the occurrence of oil rising can be suppressed.

(6-2) modification B

In the scroll compressor 101, the grooves SL1 to SL12 may be further covered with members other than the lead wires 75 when the motor 16 is viewed along the rotation axis 52 a.

For example, at least a part of the grooves SL1 to SL12 may be further covered with an insulating cap 92 covering the neutral point 78, which is the end of the lead wire 75. The neutral point 78, which is the end portion of the neutral line 77, is a free end, and is likely to collide with the compressed refrigerant passing through the grooves SL1 to SL12 and move. Therefore, as shown in fig. 13, the neutral wire 77 in the vicinity of the neutral point 78 is covered with the insulating cap 92, and the insulating cap 92 is bound to the cylindrical portion 72a of the insulator 72 with the tape 94, whereby the movement of the neutral wire 77 covered with the insulating cap 92 is suppressed. Thus, even when the neutral line 77 is present at the positions of the grooves SL6 and SL7 when the motor 16 is viewed along the rotation axis 52a, the compressed refrigerant can be suppressed from colliding with the neutral line 77 and the position of the neutral line 77 is changed. Therefore, an increase in the area of the region not covered by the lead wire 75 in the region occupied by the grooves SL6 and SL7 can be suppressed. As a result, the occurrence of oil rising can be suppressed.

The shape and structure of the insulating cap 92 are not particularly limited. Fig. 14 and 15 show an example of the insulating cap 92. The insulating cap 92 is formed of two cylindrical members formed by winding two insulating films 91a and 91b in multiple. The insulating cap 92 is formed by overlapping one end of the two cylindrical members and welding the two cylindrical members by ultrasonic welding. In fig. 13, the ultrasonic welded region is hatched.

The insulating cap 92 is preferably long enough to cover both the groove SL6 and the groove SL7 through which the compressed refrigerant passes upward.

(6-3) modification C

In the scroll compressor 101, the grooves SL1 to SL12 may be further covered with members other than the lead wires 75 when the motor 16 is viewed along the rotation axis 52 a.

For example, at least a part of the grooves SL1 to SL12 may be further covered with the insulating spacer 93. Unlike the insulating cap 92 of modification B, the insulating spacer 93 is a member that does not cover the lead wire 75 (neutral point 78). In other words, the insulating spacer 93 is a separate member from the lead wire 75. As shown in fig. 16, the insulating spacer 93 is bound to the cylindrical portion 72a of the insulator 72 together with the lead wires 75 by the tape 94, whereby movement of the lead wires 75 overlapping the insulating spacer 93 is suppressed. Thus, even when the lead wires 75 are present at the positions of the grooves SL6 and SL7 when the motor 16 is viewed along the rotation axis 52a, the compressed refrigerant can be prevented from colliding with the lead wires 75 and the positions of the lead wires 75 are prevented from changing. Therefore, an increase in the area of the region not covered by the lead wire 75 in the region occupied by the grooves SL6 and SL7 can be suppressed. As a result, the occurrence of oil rising can be suppressed.

The shape and the structure of the insulating spacer 93 are not particularly limited. For example, the same member as the insulating cap 92 shown in fig. 14 and 15 may be used as the insulating spacer 93.

The insulating spacer 93 is preferably long to the extent that it can cover both the groove SL6 and the groove SL7 through which the compressed refrigerant passes upward.

The insulating spacer 93 may be bound to the cylindrical portion 72a of the insulator 72 together with the power supply line 76 by a tape 94. Thereby, the movement of the power supply line 76 overlapping the insulating spacer 93 is suppressed. Therefore, even when the power line 76 is present at the position of the slot SL6 and the slot SL7, the compressed refrigerant can be suppressed from colliding with the power line 76, and the position of the power line 76 can be prevented from changing. As a result, the occurrence of oil rising can be suppressed.

The insulating spacer 93 may be used together with the insulating cap 92 of modification B.

(6-4) modification D

In the scroll compressor 101, only one of the groove SL6 (the first flow path P1) and the groove SL7 (the second flow path P2) may be covered with the lead line 75. For example, when the motor 16 is viewed along the rotation axis 52a, only the groove SL6 closer to the opening 20a of the discharge pipe 20 inside the casing 10 may be covered with the lead wire 75. In this case, the groove SL6 may be substantially entirely covered with the lead wire 75, for example.

In the scroll compressor 101, the grooves SL6 and SL7 are covered with the lead wires 75 so as to satisfy the above-described formulas (I) and (II). However, all of the grooves SL1 to SL12 may be covered with the lead wire 75 so as to satisfy the same expression as the above-described expression (I) and expression (II). Specifically, the lead wires 75 may be arranged such that each of the grooves SL1 to SL12 has a portion covered by at least 60% of the lead wires 75 in the radial direction R1. The plurality of grooves including the grooves SL6 and SL7, which are part of the grooves SL1 to SL12, may be covered with the lead wire 75 so as to satisfy the same expression as the expression (I) and the expression (II).

(6-5) modification E

In the scroll compressor 101, the lead wire 75 is bound and fixed to the cylindrical portion 72a of the insulator 72 by the band 94. However, the lead wire 75 may be fixed to the cylindrical portion 72a by a member other than the tape 94. For example, the lead wire 75 may be fixed to the cylindrical portion 72a by hooking to a portion protruding from the inner peripheral surface of the cylindrical portion 72a or by a member attached to the cylindrical portion 72a.

While the embodiments of the present disclosure have been described above, it should be understood that various changes in form and details may be made therein without departing from the spirit and scope of the present disclosure as set forth in the following claims.

Claims (6)

1. A scroll compressor (101) is characterized in that,

the scroll compressor (101) is provided with:

a compression mechanism (15) that compresses a refrigerant;

a motor (16) having a stator (51) and a cylindrical rotor (52) disposed inside the stator, and driving the compression mechanism;

a housing (10) that houses the compression mechanism and the motor; and

a guide (81) for guiding the refrigerant discharged from the compression mechanism to a first space (S1) in which the motor is disposed inside the housing,

the stator has:

a cylindrical back yoke (71 d); and

a plurality of teeth (71 e) protruding radially from the inner peripheral surface of the back yoke,

the motor further has:

an insulator (72);

coils (C1-C12) wound around the plurality of teeth via the insulator; and

a lead-out wire (75) led out from the end of the coil,

the first space has a second space (54, SL1-SL 12), the second space (54, SL1-SL 12) is located between the inner peripheral surface of the back yoke and the outer peripheral surface of the rotor when the motor is observed along the rotation axis (52 a) of the rotor,

the second space includes a first flow path (P1) and a second flow path (P2), the first flow path (P1) and the second flow path (P2) being located on a side opposite to a side on which the guide is located with respect to the rotation axis when the motor is viewed along the rotation axis,

at least one of the first flow path and the second flow path is covered with a first member including the lead wire when the motor is viewed along the rotation axis,

when the dimension of the first flow path in the radial direction (R1) of the rotor is a first dimension L1, the dimension of the portion of the first flow path not covered by the first member in the radial direction is a second dimension L2, the dimension of the second flow path in the radial direction is a third dimension L3, and the dimension of the portion of the second flow path not covered by the first member in the radial direction is a fourth dimension L4,

the first member is configured to satisfy a relationship of 0.ltoreq.L2/L1.ltoreq.0.4 and 0.ltoreq.L4/L3.ltoreq.0.4.

2. The scroll compressor of claim 1, wherein,

the first component is configured to further satisfy a relationship of 0.6.ltoreq.L2/L4.ltoreq.1.3.

3. A scroll compressor according to claim 1 or 2, wherein,

the first component further comprises a second component (92), the second component (92) being an insulating component covering the outlet.

4. A scroll compressor according to claim 1 or 2, wherein,

the first component further comprises a third component (93), which third component (93) is an insulating component that does not cover the outlet.

5. A scroll compressor according to claim 1 or 2, wherein,

the first member is secured to the insulator by a fourth member (94).

6. A refrigerant cycle device comprising the scroll compressor according to claim 1 or 2.