Electric compressor

Abstract

To provide a motor compressor with a terminal box arranged radial outward of a stator core, which can suppress poor insulation due to breakage of lead wires.SOLUTION: A motor chamber 17 has an expansion space 60 that houses a terminal box 61, with a portion of a motor housing 13 bulging outward compared to the other portions on an opening side of the motor housing 13 so that an outer peripheral edge of a stator core 77 is exposed in a radial direction of the rotational shaft 5. The expansion space 60 houses the terminal box 61 so that a plurality of connection terminals 75 is lined up in an axial direction of the rotational shaft 5 and at least one connection terminal 75 overlaps with the stator core 77 in the radial direction. A plurality of lead wires 76 has a length to the connection terminal 75 that is longer the further the connection terminal 75 is away from a bundling part 80.SELECTED DRAWING: Figure 7

Description

Technical Field

[0001] The present invention relates to an electric compressor.

Background Art

[0002] Patent Document 1 discloses an example of a conventional electric compressor. This electric compressor includes a compression unit that compresses and discharges a fluid, a motor that drives the compression unit, and an inverter that drives the motor.

[0003] The motor includes a cylindrical stator core and a plurality of coils. The plurality of coils are wound around the stator core such that coil ends protrude from both axial ends of the stator core. The motor is arranged side by side with the compression unit in the axial direction of the stator core.

[0004] Further, the motor includes a plurality of lead wires, a plurality of connection terminals, and a terminal box. The plurality of lead wires are drawn from the coil ends formed on the core end face closer to the compression unit in the axial direction of the stator core. The terminal box houses the plurality of connection terminals. The plurality of lead wires and the plurality of connection terminals are electrically connected to each other inside the terminal box.

[0005] In this electric compressor, the terminal box is arranged outside in the radial direction of the stator core.

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0007] Incidentally, the connection terminals inside the terminal box lock are heat-generating components. Therefore, in order to suppress thermal degradation of the connection terminals, it is desirable to position the terminal box as far away as possible from the discharge area where the fluid, which has been compressed and heated to a high temperature in the compression section, is discharged.

[0008] However, in the conventional electric compressor described above, if the terminal box is positioned axially inward from the core end face closer to the compression section in order to keep it away from the discharge area of ​​the compression section, the lead wires drawn from the coil end and connected to the terminals inside the terminal box may come into contact with the edge of the core end face, causing damage and potentially leading to insulation failure.

[0009] The present invention has been made in view of the above-mentioned conventional circumstances, and aims to provide an electric compressor in which the terminal box is arranged radially outward from the stator core, which can suppress thermal degradation of the connection terminals while suppressing insulation failure due to damage to the lead wires. [Means for solving the problem]

[0010] The electric compressor of the present invention comprises a rotating shaft and A motor comprising a rotor fixed to the rotating shaft, a cylindrical stator core surrounding the rotor, and a plurality of coils wound around the stator core such that coil ends protrude from both end faces of the stator core in the axial direction of the rotating shaft, wherein the motor rotates the rotating shaft. A compression unit that compresses the fluid by being driven by the rotation of the aforementioned rotating shaft, An inverter that drives the motor, A bottomed cylindrical motor housing houses the motor on its inner circumferential side and mounts the inverter on its outer circumferential side, A bottomed cylindrical compression housing that houses the compression section, A shaft support member is provided between the first end face on the opening side of the motor housing and the second end face on the opening side of the compression housing, partitioning the motor chamber containing the motor together with the motor housing, partitioning the compression chamber containing the compression unit together with the compression housing, and having an insertion hole through which the rotating shaft is inserted, and rotatably supporting the rotating shaft, The motor housing has multiple through holes, each of which penetrates a plurality of conductive pins that electrically connect the plurality of coils and the inverter. The aforementioned motor is In the coil end located on the opening side of the motor housing, a plurality of lead wires are drawn out from one end in the circumferential direction of the bundle portion that bundles a plurality of coils extending in the circumferential direction of the stator core, Multiple connection terminals that electrically connect multiple conductive pins and multiple lead wires, An electric compressor having a terminal box that houses a plurality of the aforementioned connection terminals and has a plurality of pin insertion holes through which each of the aforementioned conductive pins is inserted, The motor chamber has an expanded space on the opening side of the motor housing, where a portion of the motor housing bulges outward from the other portion, such that the outer edge of the stator core is exposed with respect to the radial direction of the rotating shaft, and which houses the terminal box. The terminal box is housed in the expansion space such that a plurality of the connection terminals are arranged in the axial direction, and at least one of the connection terminals overlaps with the stator core in the radial direction. The multiple lead wires are characterized in that the distance from the bundled portion to the connecting terminal increases as the connecting terminal is further away from the bundled portion.

[0011] In the electric compressor of the present invention, the arrangement of the terminal box and the method of connecting the multiple connection terminals and multiple lead wires within the terminal box are devised as follows.

[0012] In other words, the multiple lead wires are bundled together at a bundling section at the coil end on the opening side of the motor housing, i.e., the side closer to the compression section. The multiple lead wires drawn out from this bundling section are each connected to multiple connection terminals housed in a terminal box. The terminal box is located radially outward from the stator core, with the multiple connection terminals arranged axially, and at least one of the multiple connection terminals overlapping the stator core radially. Furthermore, the length of the multiple lead wires from the bundling section to the connection terminal increases as the connection terminal is further away from the bundling section. That is, the lead wire with the longest lead length drawn out from the bundling section is connected to the connection terminal furthest from the bundling section.

[0013] This configuration prevents the lead wires connected to the terminal closest to the bundle from contacting the outer edge of the stator core. In other words, if the longest lead wire among the multiple connection terminals is connected to the terminal closest to the bundle, the lead wire will sag and is more likely to contact the outer edge of the stator core. In this electric compressor, however, the longest lead wire among the multiple connection terminals is connected to the terminal furthest from the bundle, thus suppressing sagging of this lead wire and making it less likely to contact the edge of the stator core. As a result, damage to the lead wire due to contact with the edge of the stator core can be prevented.

[0014] Furthermore, the terminal box is positioned on the opening side of the motor housing such that at least one of its multiple connection terminals overlaps with the stator core in the radial direction. In other words, the terminal box is positioned such that at least one connection terminal is located on the side away from the compression section relative to the outer edge of the stator core on the opening side of the motor housing, i.e., the side closer to the compression section. This prevents thermal degradation of the connection terminals inside the terminal box due to the effects of the fluid that is compressed and heated in the compression section.

[0015] Therefore, according to the electric compressor of the present invention, in an electric compressor in which the terminal box is arranged radially outward from the stator core, it is possible to suppress thermal degradation of the connection terminals while suppressing insulation failure due to damage to the lead wires.

[0016] Preferably, the bundled section has multiple coils aligned from the inner circumference to the outer circumference of the stator core. Preferably, the multiple lead wires include a first lead wire drawn from the innermost circumference of the bundled section, a second lead wire drawn from the outermost circumference of the bundled section, and a third lead wire drawn from between the first and second lead wires in the radial direction of the rotation axis. Preferably, the length of the first lead wire drawn from the bundled section is longer than the length of the third lead wire drawn from the bundled section, and the length of the third lead wire drawn from the bundled section is longer than the length of the second lead wire drawn from the bundled section.

[0017] In this case, the further the lead wire is drawn from the inner circumference of the stator core at the bundle, the longer the length of the lead wire drawn from the bundle, i.e., the length from the bundle to the connection terminal. Therefore, sagging of the first, second, and third lead wires can be suppressed, and contact between the first, second, and third lead wires and the edge of the stator core can be suppressed.

[0018] Preferably, the multiple connection terminals include a first connection terminal connected to a first lead wire, a second connection terminal connected to a second lead wire, and a third connection terminal connected to a third lead wire. Furthermore, it is preferable that the terminal box is positioned in the expansion space when it is rotated around a predetermined rotation axis at a predetermined position with the first lead wire connected to the first connection terminal, the second lead wire connected to the second connection terminal, and the third lead wire connected to the third connection terminal. When the terminal box is rotated, it is preferable that the rotation radius of the first connection terminal is greater than the rotation radius of the third connection terminal, and the rotation radius of the third connection terminal is greater than the rotation radius of the second connection terminal.

[0019] In this case, a terminal box in which a first lead wire is connected to a first connection terminal, a second lead wire is connected to a second connection terminal, and a third lead wire is connected to a third connection terminal is rotated and then disposed in the expansion space. In this rotation, the first connection terminal to which the first lead wire, which is drawn out from the innermost circumference side at the bundling portion and has the longest length drawn out from the bundling portion, is connected rotates at the largest rotation radius. Therefore, it is possible to suppress the second lead wire and the third lead wire from contacting the edge of the stator core by the first lead wire having the longest lead-out length from the bundling portion.

Advantages of the Invention

[0020] According to the electric compressor of the present invention, in an electric compressor in which a terminal box is disposed outside in the radial direction of a stator core, it is possible to suppress insulation failure due to breakage of a lead wire while suppressing thermal deterioration of a connection terminal.

Brief Description of the Drawings

[0021] [Figure 1] FIG. 1 is a cross-sectional view of an electric compressor of an embodiment. [Figure 2] FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1, showing an electric compressor of an embodiment. [Figure 3] FIG. 3 is related to an electric compressor of an embodiment, (a) is a plan view of a terminal box, and (b) is a right side view of the terminal box. [Figure 4] FIG. 4 is a partial cross-sectional view schematically showing the configuration inside a terminal box, related to an electric compressor of an embodiment. [Figure 5] FIG. 5 is a schematic diagram for explaining a method of assembling lead wires, related to an electric compressor of an embodiment. [Figure 6] FIG. 6 is a schematic diagram for explaining a method of assembling lead wires, related to an electric compressor of an embodiment. [Figure 7] FIG. 7 is a schematic diagram for explaining a method of assembling lead wires, related to an electric compressor of an embodiment.

Modes for Carrying Out the Invention

[0022] The following describes embodiments of the present invention with reference to the drawings.

[0023] (Examples) The electric compressor in this embodiment (hereinafter simply referred to as "compressor") is specifically a scroll-type electric compressor. This compressor is mounted on a vehicle (not shown) and constitutes a vehicle air conditioning system. Specifically, it constitutes a unit-type air conditioning system mounted on an industrial vehicle.

[0024] As shown in Figure 1, the compressor of this embodiment comprises a housing 1, a rotating shaft 5, a motor 7, a fixed scroll member 9, and an orbiting scroll member 11. The fixed scroll member 9 and the orbiting scroll member 11 are examples of the "compression section" in the present invention.

[0025] In this embodiment, the front-to-back and up-and-down directions of the compressor are defined by the solid arrows shown in Figure 1. Furthermore, in Figure 1, the front of the page is considered the right, and the back of the page is considered the left. In Figures 2 and beyond, the front-to-back, up-and-down, and left-to-right directions of the compressor are defined corresponding to those in Figure 1. In the following explanation, front-to-back, up-and-down, and left-to-right directions are all based on the front-to-back, up-and-down, and left-to-right directions in Figure 1. Note that these directions are merely examples for illustrative purposes, and the compressor's orientation will be appropriately changed to suit the vehicle on which it is mounted.

[0026] As shown in Figures 1 and 2, the housing 1 consists of a motor housing 13, a compression section housing 14, a shaft support member 15, and an inverter housing 16. The motor housing 13 constitutes the front portion of the housing 1, and the compression section housing 14 constitutes the rear portion of the housing 1.

[0027] The motor housing 13 has a front wall 13a and a first circumferential wall 13b. The front wall 13a is located at the front end of the motor housing 13 and extends radially. The first circumferential wall 13b is connected to the front wall 13a and extends rearward from the front wall 13a. These front wall 13a and first circumferential wall 13b give the motor housing 13 a bottomed cylindrical shape that opens at the rear. A motor chamber 17 is formed inside the motor housing 13.

[0028] Furthermore, the motor housing 13 has an intake opening 13c and a support portion 13d. The intake opening 13c is formed in the first peripheral wall 13b and communicates with the motor chamber 17. The intake opening 13c is connected to an evaporator (not shown) by piping (not shown), and the refrigerant gas that has passed through the evaporator is drawn into the motor chamber 17. The refrigerant gas is an example of a "fluid" in this invention. The motor chamber 17 also serves as an intake chamber into which the refrigerant gas is drawn.

[0029] The support portion 13d protrudes from the front wall 13a into the motor chamber 17. The support portion 13d is cylindrical and has a first radial bearing 19 inside. Alternatively, an intake opening 13c may be formed in the front wall 13a.

[0030] The compression section housing 14 has a rear wall 14a and a second circumferential wall 14b. The rear wall 14a is located at the rear end of the compression section housing 14 and extends radially across the compression section housing 14. The second circumferential wall 14b is connected to the rear wall 14a and extends forward from the rear wall 14a. These rear wall 14a and second circumferential wall 14b give the compression section housing 14 a bottomed cylindrical shape with an open front.

[0031] The compression section housing 14 includes an oil separation chamber 14c, a first discharge recess 14d, a discharge passage 14e, a discharge opening 14f, and a compression section chamber 18. The oil separation chamber 14c is located on the rear side within the compression section housing 14 and extends radially within the compression section housing 14. The first discharge recess 14d is located forward of the oil separation chamber 14c within the compression section housing 14 and has a shape that recesses toward the oil separation chamber 14c. The discharge passage 14e extends in the front-rear direction and connects the oil separation chamber 14c and the first discharge recess 14d. The discharge opening 14f communicates with the upper end of the oil separation chamber 14c and opens toward the outside of the compression section housing 14. The discharge opening 14f is connected to a condenser (not shown) by piping.

[0032] A separation cylinder 21 is fixed inside the oil separation chamber 14c. The separation cylinder 21 has a cylindrical outer surface 21a. The outer surface 21a is coaxial with the inner surface 140 of the oil separation chamber 14c. These outer surface 21a and inner surface 140 constitute a separator.

[0033] The support member 15 is provided between the motor housing 13 and the compression housing 14. More specifically, it is provided between the first end face 13j on the opening side of the motor housing 13 and the second end face 14g on the opening side of the compression housing 14. The motor housing 13, the compression housing 14, and the support member 15 are fastened together from the compression housing 14 side by a plurality of bolts 25.

[0034] Furthermore, the support member 15 has a first bulge 150 that bulges radially outward from its outer peripheral edge. The first bulge 150 bulges radially outward from the compression housing 14. The first bulge 150 and the second bulge 130 of the motor housing 13 (described later) are fastened together by a plurality of bolts 25 and 26. In this way, the support member 15 is sandwiched between the motor housing 13 and the compression housing 14 and fixed to the motor housing 13 and the compression housing 14. As a result, the support member 15 partitions the motor chamber 17 together with the motor housing 13 and partitions the compression chamber 18 together with the compression housing 14. Note that Figure 1 shows one of each of the plurality of bolts 25 and 26. Also, the method of fixing the motor housing 13, the compression housing 14 and the support member 15 can be designed as appropriate.

[0035] The support member 15 has a boss 15a that protrudes forward. An insertion hole 15b is formed at the tip of the boss 15a. A second radial bearing 27 and a sealing member 29 are provided inside the boss 15a.

[0036] The rotating shaft 5 is provided inside the housing 1. The rotating shaft 5 is cylindrical in shape and extends in the front-rear direction. The rotating shaft 5 has a small diameter portion 5a and a large diameter portion 5b. The small diameter portion 5a is located on the front end side of the rotating shaft 5. The large diameter portion 5b is located further rear than the small diameter portion 5a. The large diameter portion 5b is formed to be larger in diameter than the small diameter portion 5a. A flat rear end surface 5d is formed at the rear end of the large diameter portion 5b.

[0037] The rotating shaft 5 has a small diameter portion 5a that is rotatably supported on a support portion 13d of the motor housing 13 via a first radial bearing 19. The rear end of the large diameter portion 5b is inserted through a through hole 15b of the shaft support member 15, and within the boss 15a, the rear end of the large diameter portion 5b is rotatably supported on the shaft support member 15 via a second radial bearing 27. In this way, the rotating shaft 5 is rotatable around the rotation axis O within the housing 1. The rotation axis O extends parallel to the front-rear direction of the compressor. The axial direction of the rotating shaft 5 coincides with the direction of the rotation axis O. The space between the shaft support member 15 and the rotating shaft 5 is sealed by a seal member 29.

[0038] Furthermore, an eccentric pin 50 is fixed to the large-diameter portion 5b of the rotating shaft 5. The eccentric pin 50 is positioned eccentrically from the rotation axis O on the rear end surface 5d. The eccentric pin 50 is formed in a cylindrical shape with a smaller diameter than the rotating shaft 5 and extends rearward from the rear end surface 5d. The eccentric pin 50 is fitted into the bush 50a within the back pressure chamber 52, which will be described later.

[0039] Furthermore, a balance weight 33 is integrally formed on the large-diameter portion 5b of the rotating shaft 5. The balance weight 33 is positioned eccentrically from the rotation axis O on the large-diameter portion 5b. More specifically, the balance weight 33 is positioned on the opposite side of the eccentric pin 50, with the rotation axis O in between. Although detailed illustration is omitted, the balance weight 33 is formed in a roughly fan-shaped plate form. The balance weight 33 extends in the radial direction of the rotating shaft 5 away from the large-diameter portion 5b. The radial direction of the rotating shaft 5 is perpendicular to the front-rear direction. In other words, the balance weight 33 extends from the large-diameter portion 5b toward the first circumferential wall 13b side of the motor housing 13.

[0040] As shown in Figure 1, the motor 7 is housed in the motor chamber 17. The motor 7 has a stator 7a and a rotor 7b. The stator 7a is fixed to the inner surface of the first peripheral wall 13b. The stator 7a is connected to an inverter 73, which will be described later, provided in the inverter housing 16.

[0041] The stator 7a has a cylindrical stator core 77 and coils 78 wound around the stator core 77. The coils 78 have a pair of coil ends 74, 74 that protrude forward and backward from the stator core 77 in the axial direction of the stator core 77. The axial direction of the stator core 77 coincides with the forward and backward direction. The coil ends 74 are formed by portions of the U-phase, V-phase, and W-phase coils 78 wound around the stator core 77.

[0042] Three lead wires 76 extend from a coil end 74 formed on the core end face 771, which is the axial end of the stator core 77 closest to the fixed scroll member 9 and the movable scroll member 11. The three lead wires 76 correspond to the U-phase, V-phase, and W-phase coils, respectively. Each lead wire 76 is covered with an insulating tube (not shown).

[0043] The three lead wires 76 are drawn out radially outward from the stator core 77 and above the stator core 77. The bundle portion 80 is formed on the axial end face 741 of the rear coil end 74, which is formed projecting axially outward, i.e., rearward, from the rear core end face 771 of the stator core 77. In the following description, "outward in the axial direction" refers to the rear, which is one axial direction, and "inward in the axial direction" refers to the front, which is the other axial direction.

[0044] As shown in Figure 2, the bundled portion 80 is formed by bundling three lead wires 76 extending in the circumferential direction of the stator core 77 along the end face 741 in the radial direction of the stator core 77. The lead wire 76 drawn from the innermost radial side of the stator core 77 in the bundled portion 80 is hereinafter referred to as the first lead wire 76a. The lead wire 76 drawn from the outermost radial side of the stator core 77 in the bundled portion 80 is hereinafter referred to as the second lead wire 76b. The lead wire 76 drawn from between the first lead wire 76a and the second lead wire 76b in the radial direction of the stator core 77 in the bundled portion 80 is hereinafter referred to as the third lead wire 76c.

[0045] The rotor 7b is located inside the stator 7a. The large-diameter portion 5b of the rotating shaft 5 is press-fitted into the rotor 7b. This fixes the rotating shaft 5 to the rotor 7b. The rotor 7b rotates inside the stator 7a, causing the rotating shaft 5 to rotate around the axis of rotation O.

[0046] The compression chamber 18 is located on the front side within the compression housing 14. The compression chamber 18 houses a fixed scroll member 9 and a rotating scroll member 11.

[0047] The fixed scroll member 9 is fixed to the compression housing 14. The fixed scroll member 9 has a fixed substrate 9a, an outer peripheral wall 9b, and a fixed spiral wall 9c. The fixed substrate 9a is located at the rear end of the fixed scroll member 9 and is formed in a disc shape. A second discharge recess 9d and a discharge port 9e are formed on the fixed substrate 9a. The second discharge recess 9d is shaped to be recessed forward from the rear end surface of the fixed substrate 9a. The second discharge recess 9d faces the first discharge recess 14d when the fixed scroll member 9 is fixed to the compression housing 14. In this way, the first discharge recess 14d and the second discharge recess 9d form a discharge chamber 35. The discharge chamber 35 communicates with the oil separation chamber 14c through the discharge passage 14e. The discharge port 9e penetrates the fixed substrate 9a in the front-rear direction and communicates with the discharge chamber 35.

[0048] Furthermore, the discharge reed valve 39 and retainer 40 are attached to the fixed substrate 9a by bolts 37. The bolts 37, discharge reed valve 39, and retainer 40 are located inside the discharge chamber 35. The discharge reed valve 39 opens and closes the discharge port 9e by elastic deformation. The retainer 40 adjusts the amount of elastic deformation of the discharge reed valve 39.

[0049] The outer peripheral wall 9b is connected to the fixed substrate 9a on its outer circumference and extends forward in a cylindrical shape. An intake port 9f is formed in the outer peripheral wall 9b. The intake port 9f penetrates the outer peripheral wall 9b radially. As a result, the intake port 9f opens into the compression housing 14. The fixed spiral wall 9c is raised on the front surface of the fixed substrate 9a and is integral with the fixed substrate 9a inside the outer peripheral wall 9b.

[0050] The orbital scroll member 11 is located between the fixed scroll member 9 and the pivot member 15. The orbital scroll member 11 has an orbital base plate 11a and an orbital spiral wall 11b. The orbital base plate 11a is located at the front end of the orbital scroll member 11 and is formed in the shape of a disc. A bush 50a is rotatably supported on the orbital base plate 11a via a third radial bearing 45. As a result, the orbital scroll member 11 is connected to the rotation axis 5 at an eccentric position from the rotation axis O through the bush 50a and the eccentric pin 50. The orbital spiral wall 11b extends from the rear side surface of the orbital base plate 11a toward the fixed base plate 9a.

[0051] The fixed scroll member 9 and the orbiting scroll member 11 are interlocked with each other. As a result, a compression chamber 49 is formed between the fixed scroll member 9 and the orbiting scroll member 11 by the fixed substrate 9a, the fixed spiral wall 9c, the orbiting substrate 11a, and the orbiting spiral wall 11b. The volume of the compression chamber 49 changes as the orbiting scroll member 11 rotates. As a result, the compression chamber 49 communicates with the intake port 9f and the discharge port 9e, respectively.

[0052] A thrust plate 51 is provided between the orbiting scroll member 11 and the pivot member 15. The thrust plate 51 is made of a thin metal plate and is in contact with the orbiting scroll member 11 and the pivot member 15, respectively. The thrust plate 51 can bias the orbiting scroll member 11 to the rear, i.e., towards the fixed scroll member 9, by the restoring force during elastic deformation. A back pressure chamber 52 is formed between the orbiting scroll member 11 and the pivot member 15. Near the center of the orbiting spiral wall 11b, an air supply hole 11c is provided, which opens at the front end of the orbiting spiral wall 11b and extends in the front-rear direction through the orbiting spiral wall 11b to the orbiting base plate 11a. As a result, the back pressure chamber 52 is in communication with the discharge port 9e via the air supply hole 11c.

[0053] The orbiting scroll member 11, the thrust plate 51, and the pivot support member 15 are connected by an anti-rotation mechanism 41. The anti-rotation mechanism 41 consists of six rings 47 and six rotation-preventing pins 31. Each ring 47 is fixed to the orbiting base plate 11a. Figure 1 shows one of the six rings 47 and one of the six rotation-preventing pins 31.

[0054] Each rotation-preventing pin 31 is fixed to the pivot member 15 while passing through the thrust plate 51. Each rotation-preventing pin 31 is then inserted into each ring 47, thereby connecting each ring 47 to each rotation-preventing pin 31. In this way, the rotation prevention mechanism 41 restricts the rotation of the orbiting scroll member 11, allowing only revolution, as each rotation-preventing pin 31 slides and rolls along the inner circumferential surface of each ring 47.

[0055] Furthermore, in this compressor, an intake passage 55 is provided in the shaft support member 15. The intake passage 55 is located outside the rotating shaft 5 and the rotation-preventing pin 31 in the radial direction of the rotating shaft 5. The intake passage 55 penetrates the shaft support member 15 in the front-rear direction. As a result, the intake passage 55 connects the motor chamber 17 and the intake port 9f.

[0056] Thus, in this compressor, within the housing 1, the fixed scroll member 9 and the movable scroll member 11, which constitute the compression section, and the motor 7 are arranged in the axial direction with a support member 15 in between.

[0057] Furthermore, as shown in Figure 2, the motor housing 13 has a second bulge portion 130 that bulges radially outward from the first circumferential wall 13b. An expansion space 60 is formed within the second bulge portion 130. The expansion space 60 constitutes part of the motor chamber 17. That is, as shown in Figure 1, in an axial view of the rotating shaft 5, the motor chamber 17 has an expansion space 60 on the opening side of the motor housing 13 that bulges outward from the intake passage 55 with respect to the radial direction of the rotating shaft 5. The expansion space 60 can also be called a bulging space. The outer edge of the core end face 771 on the opening side of the motor housing 13 of the stator core 77, i.e., the side closer to the compression chamber 18, is exposed in this expansion space 60.

[0058] Furthermore, within the expansion space 60, an insulating terminal box 61 is housed, which is extended radially outward from the coil end 74 along with the lead wires 76. More specifically, the expansion space 60 houses three connection terminals 75, which will be described later, arranged axially, and the terminal box 61 is housed such that at least one of the connection terminals 75 overlaps with the stator core 77 in the radial direction.

[0059] A recess 13f is formed in the second bulge 130 portion of the right end face 13e of the motor housing 13, indenting to the left, i.e., toward the expansion space 60. This recess 13f constitutes part of the inverter chamber 72, which will be described later. An airtight terminal 70 is located inside the recess 13f. The airtight terminal 70 has three conductive pins 71 that are electrically connected to the inverter 73, which will be described later. The airtight terminal 70 is configured to maintain airtightness of the motor chamber 17 by inserting each conductive pin 71 through three through holes 13h formed in the right side wall 13g, which will be described later. In this way, the conductive pins 71 are held in place by the through holes 13h.

[0060] An inverter housing 16 is provided to the right of the motor housing 13. The inverter housing 16 is a bottomed cylindrical shape with an opening on the left side. The open end of the inverter housing 16 is fastened to the right end face 13e of the motor housing 13 by bolts (not shown). In this way, the inverter housing 16 and the right end face 13e of the motor housing 13 form an inverter chamber 72. The right side wall 13g of the motor housing 13 separates the inverter chamber 72 from the motor chamber 17. The right side wall 13g separates the motor chamber 17 and the inverter chamber 72 in the left-right direction. An inverter 73 that drives the motor 7 is housed inside the inverter chamber 72. A through hole 13h is formed in the right side wall 13g, penetrating it in the left-right direction. Thus, the motor housing 13 houses the motor 7 on its inner circumferential surface side and mounts the inverter 73 on its outer circumferential surface side.

[0061] As shown in Figure 3, the terminal box 61 has a rectangular parallelepiped shape that is elongated in the vertical direction. The terminal box 61 has a front wall 61a, a rear wall 61b, a left wall 61c, a right wall 61d, an upper wall 61e, and a lower wall 61f. The directions of the arrows in Figure 3 indicating the front-to-back, up-and-down, and left-to-right directions assume that the terminal box 61 is positioned within the expansion space 60. Figure 3(b) is a right side view of the terminal box 61 shown in Figure 1, with the terminal box 61 facing forward as viewed from the rear of Figure 1.

[0062] The right wall portion 61d of the terminal box 61 has three pin insertion holes 62 arranged in the front-to-back direction. The lower wall portion 61f of the terminal box 61 has three lead wire insertion holes 63 arranged in the front-to-back direction (see Figure 4). Note that Figure 4 shows one of the three lead wire insertion holes 63. The number of lead wire insertion holes 63 can be any number as long as the lead wires 76 can be inserted.

[0063] As shown in Figure 4, the terminal box 61 houses three connection terminals 75, corresponding to the number of phases in the motor 7. The three connection terminals 75 are connected to the U-phase, V-phase, and W-phase coils 78, respectively. Note that only one of the three connection terminals 75 is shown in Figure 4. Each connection terminal 75 has a lead wire connection portion 751 and a pin connection portion 752.

[0064] Each lead wire connection portion 751 is electrically connected to three lead wires 76 extending from the end face 741 of the rear coil end 74. The three lead wires 76 are lead wires drawn from the portions in which the U-phase, V-phase, and W-phase coils 78 are wound around the stator core 77. The three lead wires 76 are drawn from the coil end 74 located on the opening side of the motor housing 13, i.e., the side closer to the compression chamber 18. Each pin connection portion 752 has a connection hole 753 formed therein. The conductive pins 71 are electrically connected to the pin connection portion 752 when each conductive pin 71 inserted through the pin insertion hole 62 of the terminal box 61 is fitted into each connection hole 753.

[0065] Here, the arrangement of the terminal box 61 in this compressor, the method of connecting the three lead wires 76 and the three connection terminals 75, and the assembly method will be explained below.

[0066] First, outside the housing 1, as shown in Figure 5, the terminal box 61 is positioned relative to the stator core 77 such that the left wall portion 61c and the right wall portion 61d of the terminal box 61 face the axial direction of the stator core 77 (the plane of the paper in Figure 5), the front wall portion 61a and the rear wall portion 61b of the terminal box 61 face the radial direction of the stator core 77 (the direction of the left and right arrows in Figure 5), and the bottom wall portion 61f of the terminal box 61 faces the stator core 77. In this arrangement shown in Figure 5, the left wall portion 61c faces the back of the paper in Figure 5, the right wall portion 61d faces the front of the paper in Figure 5, the rear wall portion 61b faces the left arrow in Figure 5, and the front wall portion 61a faces the right arrow in Figure 5.

[0067] Then, three lead wires 76 are connected one-to-one to the three connection terminals 75 in the terminal box 61 in this arrangement. In this case, in Figure 5, the first connection terminal 75a, located on the far right of the terminal box 61, is connected to the first lead wire 76a. Also in Figure 5, the second connection terminal 75b, located on the far left of the terminal box 61, is connected to the second lead wire 76b. Also in Figure 5, the third connection terminal 75c, located between the first connection terminal 75a and the second connection terminal 75b, is connected to the third lead wire 76c.

[0068] Then, the terminal box 61 is rotated 90 degrees clockwise (in the direction of the P arrow in Figure 5) when viewed from the lower wall portion 61f side, to the arrangement shown in Figure 6. As a result, the front wall portion 61a and the rear wall portion 61b of the terminal box 61 face the axial direction of the stator core 77 (the plane of the paper in Figure 6), the left wall portion 61c and the right wall portion 61d of the terminal box 61 face the radial direction of the stator core 77 (the left and right arrow directions in Figure 6), and the lower wall portion 61f of the terminal box 61 faces the stator core 77, thus positioning the terminal box 61 relative to the stator core 77. In this arrangement shown in Figure 6, the front wall portion 61a faces the back of the paper in Figure 6, the rear wall portion 61b faces the front of the paper in Figure 6, the left wall portion 61c faces the left arrow in Figure 6, and the right wall portion 61d faces the right arrow in Figure 6. The positional relationship between the stator 7a and the terminal box 61 shown in Figure 6 corresponds to the positional relationship between the stator 7a and the terminal box 61 when the compressor is viewed from the rear, as shown in Figure 1.

[0069] The position and axis of rotation of the terminal box 61 are as follows. As shown in Figure 5, the terminal box 61 is positioned near a virtual plane (a plane extending parallel to the end face 741 in Figure 5) that intersects with the axial direction of the stator core 77 near the end face 741 of the coil end 74 on the opening side of the motor housing 13, i.e., the compression chamber 18 side. The terminal box 61 is then rotated around a rotation axis C (see Figure 7) that extends on this virtual plane and extends in the direction in which the connecting terminals 75 extend along the rear wall portion 61b of the terminal box 61 at the position of the rear wall portion 61b of the terminal box 61. At this time, the orientation of the terminal box 61 after rotation, as shown in Figures 6 and 7, is such that the three pin insertion holes 62 are facing the three through holes 13h, respectively, while it is positioned within the expansion space 60.

[0070] Due to this rotation of the terminal box 61, the radius of rotation of the first connecting terminal 75a is larger than the radius of rotation of the third connecting terminal 75c, and the radius of rotation of the third connecting terminal 75c is larger than the radius of rotation of the second connecting terminal 75b.

[0071] Subsequently, the stator 7a and terminal box 61 are placed inside the motor housing 13 while maintaining the positional relationship shown in Figure 6. Then, while holding the terminal box 61 in place using a jig (not shown), the conductive pins 71 of the airtight terminal 70 are inserted from the inverter chamber 72 side into the through holes 13h and pin insertion holes 62, and connected to the pin connection parts 752 of each connection terminal 75 inside the terminal box 61. At this time, the airtight terminal 70 is fixed to the right side wall 13g so as to maintain airtightness of the motor chamber 17. In this way, the terminal box 61 is fixed in a predetermined position inside the motor housing 13 while maintaining a predetermined positional relationship with respect to the stator 7a.

[0072] Figure 7 shows the stator 7a and terminal box 61 fixed inside the motor housing 13. The positional relationship between the stator 7a and the terminal box 61 shown in Figure 7 corresponds to the positional relationship between the stator 7a and the terminal box 61 when the compressor shown in Figure 1 is viewed from the left, that is, from the back of the page in Figure 1.

[0073] The first connection terminal 75a is located axially inward of the stator core 77 beyond the core end face 771 of the stator core 77, i.e., forward of the core end face 771. In other words, the first connection terminal 75a overlaps with the stator core 77 in the radial direction. In this embodiment of the compressor, the second connection terminal 75b and the third connection terminal 75c are located axially outward of the stator core 77 beyond the core end face 771 of the stator core 77, i.e., backward of the core end face 771.

[0074] Furthermore, the first lead wire 76a connected to the first connection terminal 75a is pulled between the end face 741 and the terminal box 61, and is positioned with a predetermined tension in the tensile direction. Also, this first lead wire 76a is not in contact with the core end face 771 of the stator core 77. The second lead wire 76b and the third lead wire 76c are located further outward in the axial direction of the stator core 77 than the first lead wire 76a. Specifically, the third lead wire 76c is located further outward in the axial direction of the stator core 77 than the first lead wire 76a. Also, the second lead wire 76b is located further outward in the axial direction of the stator core 77 than the third lead wire 76c. In this case, the second lead wire 76b and the third lead wire 76c may or may not be pulled between the end face 741 and the terminal box 61. Furthermore, the three lead wires 76 may or may not be in contact with each other between the end face 741 and the terminal box 61.

[0075] In this compressor, the motor 7 operates under the control of the inverter 73. Specifically, power is supplied to the inverter 73 from an external battery or the like, and from the inverter 73 to the coil 78 via conductive pins 71, connection terminals 75 and lead wires 76, causing the rotating shaft 5 to rotate around the rotation axis O. As a result, the orbiting scroll member 11 rotates, the orbiting base plate 11a slides along the tip of the fixed spiral wall 9c, and the fixed spiral wall 9c and the orbiting spiral wall 11b slide against each other. At this time, the rotation prevention mechanism 41 restricts the rotation of the orbiting scroll member 11, causing it to revolve only. In this way, as the orbiting scroll member 11 rotates, the refrigerant gas in the motor chamber 17, which also serves as the intake chamber, flows through the intake passage 55 to the intake port 9f, and is drawn into the compression chamber 49 from the intake port 9f. The compression chamber 49 then compresses the refrigerant gas inside while its volume decreases due to the rotation of the orbiting scroll member 11.

[0076] The high-pressure refrigerant gas compressed in the compression chamber 49 is then discharged from the discharge port 9e into the discharge chamber 35, and further from the discharge chamber 35, it passes through the discharge passage 14e to the oil separation chamber 14c. As this high-pressure refrigerant gas circulates between the outer surface 21a of the separation cylinder 21 and the inner surface 140 of the oil separation chamber 14c, it separates the lubricating oil, flows through the inside of the separation cylinder 21, is discharged from the discharge opening 14f, and is then discharged to the condenser.

[0077] In this electric compressor, the three lead wires 76 are bundled together at a bundle section 80 at the coil end 74 closest to the compression chamber 18. The three lead wires 76 drawn from this bundle section 80 are each connected to three connection terminals 75 housed in a terminal box 61. The terminal box 61 is located radially outward from the stator core 77, with the three connection terminals 75 aligned axially with the stator core 77, and the first connection terminal 75a of the three connection terminals 75 overlapping with the stator core 77 in the radial direction. The length of the three lead wires 76 from the bundle section 80 to the connection terminal 75 increases as the connection terminal 75 is further away from the bundle section 80. That is, the first lead wire 76a, which has the longest lead length drawn from the bundle section 80, is connected to the first connection terminal 75a, which is furthest from the bundle section 80.

[0078] This configuration prevents the second and third lead wires 76b and 76c, which are connected to the second and third connection terminals 75b and 75c, the ones closer to the bundle portion 80 among the three connection terminals 75, from contacting the outer edge of the core end face 771 of the stator core 77. As a result, damage to the lead wires 76 due to contact with the edge of the stator core 77 can be prevented.

[0079] Furthermore, the terminal box 61 is positioned such that the first connection terminal 75a is located on the side away from the compression chamber 18, relative to the outer edge of the stator core 77 on the side closer to the compression chamber 18. In other words, the terminal box 61 is positioned such that the first lead wire 76a is located in front of the core end face 771, thus moving it further away from the piping connected to the discharge chamber 35 and the discharge opening 14f. This prevents thermal degradation of the connection terminal 75 inside the terminal box 61 due to the refrigerant gas, which is compressed and heated in the compression chamber 49.

[0080] Therefore, with this compressor, in an electric compressor where the terminal box 61 is positioned radially outward from the stator core 77, thermal degradation of the connection terminals 75 can be suppressed while insulation failure due to damage to the lead wires 76 can be suppressed.

[0081] In particular, in this compressor, the bundle section 80 aligns three coils 78 from the inner circumference to the outer circumference of the stator core 77. The length of the first lead wire 76a, which is drawn out from the innermost circumference of the bundle section 80, is longer than the length of the third lead wire 76c, and the length of the third lead wire 76c, which is drawn out from the bundle section 80, is longer than the length of the second lead wire 76b, which is drawn out from the bundle section 80.

[0082] In this case, the length of the first lead wire 76a, which is drawn out from the innermost circumference of the stator core 77 at the bundle portion 80, i.e., the length from the bundle portion 80 to the first connection terminal 75a, is longer than the length of the second lead wire 76b and the third lead wire 76c. Also, the length of the third lead wire 76c, i.e., the length from the bundle portion 80 to the third connection terminal 75c, is longer than the length of the second lead wire 76b. On the other hand, the first connection terminal 75a is positioned further away from the bundle portion 80 than the second connection terminal 75b and the third connection terminal 75c. Also, the third connection terminal 75c is positioned further away from the bundle portion 80 than the second connection terminal 75b. As a result, sagging of the first leader wire 76a, the second leader wire 76b, and the third leader wire 76c can be suppressed, and contact between the first leader wire 76a, the second leader wire 76b, and the third leader wire 76c and the edge of the stator core 77 can be suppressed.

[0083] Furthermore, as described above, when the terminal box 61 is rotated, the radius of rotation of the first connection terminal 75a is larger than the radius of rotation of the third connection terminal 75c, and the radius of rotation of the third connection terminal 75c is larger than the radius of rotation of the second connection terminal 75b.

[0084] Therefore, the first connecting terminal 75a, to which the first lead wire 76a, which is drawn from the innermost side of the bundled portion 80 and has the longest length drawn out from the bundled portion 80, is connected, rotates with the largest radius of rotation. As a result, when the terminal box 61 is rotated so that the first connecting terminal 75a overlaps radially with the stator core 77 near the coil end 74, the first lead wire 76a, the second lead wire 76b, and the third lead wire 76c can be twisted. Consequently, the first lead wire 76a, which has the longest length drawn out from the bundled portion 80, can prevent the second lead wire 76b and the third lead wire 76c from contacting the edge of the stator core 77.

[0085] In this compressor, the terminal box 61, which is located radially outward from the stator core 77, is positioned at a predetermined location relative to the stator core 77. Specifically, the terminal box 61 is positioned such that the first connection terminal 75a is located in front of the core end face 771, and the first lead wire 76a connected to the first connection terminal 75a does not come into contact with the core end face 771. Furthermore, the first lead wire 76a connected to the first connection terminal 75a within the terminal box 61 has a predetermined tension in the tensile direction between the end face 741 and the terminal box 61.

[0086] With this configuration, the movement of the second and third leader wires 76b and 76c, which tend to approach the core end face 771 due to vibration or the like, can be suppressed by contact with the first leader wire 76a. Therefore, the first leader wire 76a can prevent the second and third leader wires 76b and 76c from coming into contact with the core end face 771. In addition, the first leader wire 76a itself is pulled between the end face 741 and the terminal box 61. Therefore, the first leader wire 76a can suppress its own tension from moving towards the core end face 771. As a result, damage to the leader wire 76 due to contact with the core end face 771 can be suppressed.

[0087] Furthermore, in the bundled section 80, the three leader wires 76 are bundled together radially along the end face 741. Therefore, compared to the case where the three leader wires 76 are bundled together axially on the end face 741, it is possible to suppress an increase in axial size.

[0088] Although the present invention has been described above with reference to examples, it goes without saying that the present invention is not limited to the above examples and can be applied with appropriate modifications without departing from its spirit.

[0089] For example, in the compressor of the embodiment, the three lead wires 76 are bundled radially in the bundling section 80 on the end face 741, but the present invention is not limited to this. For example, the three lead wires 76 may be bundled while in contact with each other. Also, the three lead wires 76 do not need to be bundled.

[0090] Furthermore, in the compressor of the embodiment, the terminal box 61 is positioned such that one of the three connection terminals 75 is located axially inward from the core end face 771, but the present invention is not limited to this. For example, the terminal box 61 may be positioned such that two or all of the two of the three connection terminals 75 are located axially inward from the core end face 771.

[0091] Furthermore, in the compressor of this embodiment, the number of connection terminals 75 and lead wires 76 is set to 3 each, but they may also be set to 2 each.

[0092] Furthermore, the thrust plate 51 may be omitted in the compressor of the embodiment.

[0093] Furthermore, in the compressor of this embodiment, the rotation prevention mechanism 41 is composed of six rings 47 and six rotation-preventing pins 31, but the rotation prevention mechanism 41 is not limited to this and may be configured in other ways.

[0094] Furthermore, in the compressor of this embodiment, a refrigerant gas as a fluid is compressed in the compression chamber 49, but the invention is not limited to this, and a fluid such as air supplied to the fuel cell may also be compressed in the compression chamber 49. [Industrial applicability]

[0095] This invention can be used in air conditioning systems for vehicles and the like. [Explanation of Symbols]

[0096] 1… Housing 5…Rotation axis 7…motor 7b...Rotor 9…Fixed scroll member (compression section) 9b…Outer wall 9c... Fixed spiral wall 11…Swivel scroll member (compression section) 13…Motor housing 13h...Through hole 13j...first end surface 14…Compression housing 14g…Second end surface 15…Support member 15b…Through hole 17…Motor Room 18... Compression Room 60...Expansion Space 61...Terminal box 62...Pin insertion hole 71... Conductive pins 73…Inverter 74... Coil end 75…Connection terminals 75a...First connection terminal 75b...Second connection terminal 75c...Third connection terminal 76a…1st leader line 76b…Second leader line 76c…Third leader line 76... Lead line 77… Stator core 78... Coil 80... Bundling part C...Center of rotation axis

Claims

1. The axis of rotation and A motor comprising a rotor fixed to the rotating shaft, a cylindrical stator core surrounding the rotor, and a plurality of coils wound around the stator core such that coil ends protrude from both end faces of the stator core in the axial direction of the rotating shaft, wherein the motor rotates the rotating shaft. A compression unit that compresses the fluid by being driven by the rotation of the aforementioned rotating shaft, An inverter that drives the motor, A bottomed cylindrical motor housing houses the motor on its inner circumferential side and mounts the inverter on its outer circumferential side, A bottomed cylindrical compression housing that houses the compression section, A shaft support member is provided between the first end face on the opening side of the motor housing and the second end face on the opening side of the compression housing, partitioning the motor chamber containing the motor together with the motor housing, partitioning the compression chamber containing the compression unit together with the compression housing, and having an insertion hole through which the rotating shaft is inserted, and rotatably supporting the rotating shaft, The motor housing has multiple through holes, each of which penetrates a plurality of conductive pins that electrically connect the plurality of coils and the inverter. The aforementioned motor is In the coil end located on the opening side of the motor housing, a plurality of lead wires are drawn out from one end in the circumferential direction of the bundle portion that bundles a plurality of coils extending in the circumferential direction of the stator core, Multiple connection terminals that electrically connect multiple conductive pins and multiple lead wires, An electric compressor having a terminal box that houses a plurality of the aforementioned connection terminals and has a plurality of pin insertion holes through which each of the aforementioned conductive pins is inserted, The motor chamber has an expanded space on the opening side of the motor housing, where a portion of the motor housing bulges outward from the other portion, such that the outer edge of the stator core is exposed with respect to the radial direction of the rotating shaft, and which houses the terminal box. The terminal box is housed in the expansion space such that a plurality of the connection terminals are arranged in the axial direction, and at least one of the connection terminals overlaps with the stator core in the radial direction. An electric compressor characterized in that the length of the multiple lead wires from the bundle portion to the connecting terminal increases as the connecting terminal is further away from the bundle portion.

2. The bundled portion aligns a plurality of the coils from the inner circumference to the outer circumference of the stator core. Each of the multiple leader wires comprises a first leader wire drawn from the innermost circumference of the bundled portion, a second leader wire drawn from the outermost circumference of the bundled portion, and a third leader wire drawn from between the first and second leader wires in the radial direction. The electric compressor according to claim 1, wherein the length of the first lead wire drawn out from the bundle portion is longer than the length of the third lead wire drawn out from the bundle portion, and the length of the third lead wire drawn out from the bundle portion is longer than the length of the second lead wire drawn out from the bundle portion.

3. The plurality of connection terminals include a first connection terminal connected to the first lead wire, a second connection terminal connected to the second lead wire, and a third connection terminal connected to the third lead wire. The terminal box, with the first lead wire connected to the first connection terminal, the second lead wire connected to the second connection terminal, and the third lead wire connected to the third connection terminal, is rotated at a predetermined position around a predetermined rotational axis to assume a position where it is positioned within the expansion space. The electric compressor according to claim 2, wherein the radius of rotation of the first connecting terminal when the terminal box is rotated is greater than the radius of rotation of the third connecting terminal, and the radius of rotation of the third connecting terminal is greater than the radius of rotation of the second connecting terminal.

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