JP2022102778A - Motor compressor - Google Patents

Abstract

To provide a motor compressor capable of preventing foreign matter generated by fusing from entering other sites.SOLUTION: A portion of a predetermined length including a first end part 70a of a heat shrink tube 70 is shrunk along a motor wiring 30. Also, at a portion having a predetermined length including the second end part 70b of the heat shrink tube 70, the heat shrink tube 70 is shrunk along not only a connection terminal 50 but also a motor wiring 30.SELECTED DRAWING: Figure 4

Description

The present invention relates to an electric compressor.

The electric compressor includes a compression unit that compresses a fluid such as a refrigerant, an electric motor that drives the compression unit, a motor drive circuit that drives the electric motor, and a conductive member that is electrically connected to the motor drive circuit. The motor wiring drawn from the electric motor and the connection terminal for electrically connecting the conductive member and the motor wiring are provided.

The motor wiring is drawn from the coil of the electric motor. The tip of the motor wiring is electrically connected to the connection terminal. The motor wiring has a plurality of conductors and an insulating coating that covers the conductors. At the tip of the motor wiring connected to the connection terminal, the insulating coating is removed and the conducting wire is exposed. Then, in the motor wiring connected to one connection terminal, the conducting wire at the tip portion and the connection terminal are electrically connected. For example, by crimping (crimping) a plurality of conductors of a motor wiring by a caulking portion extending from a connection terminal, the conductor and the connection terminal are mechanically connected and electrically connected. ..

In recent years, in electric compressors, as it is required to supply a large current to an electric motor to drive it, the number of conductors of the motor wiring drawn from the coil is increasing. However, as the number of conductors increases, it takes more time and effort to remove the insulating film. For this reason, for example, by fusing, each of the insulating coatings at the tip of the motor wiring is melted by heat, and all the exposed conductors are crimped (crimped) to the connection terminals to electrically connect them. The work of removing the coating film is simplified (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2008-23296

However, when fusing is adopted, the molten insulating film is likely to be generated as a foreign substance at the connection point between the conducting wire and the connection terminal at the tip of the motor wiring, and this foreign substance is caused by vibration of the electric compressor, for example. There is a risk that it will move from the connection point and enter a sliding part such as a motor, or that it will enter a compression part.

An electric compressor for solving the above problems is electrically connected to a compression unit that compresses a fluid, an electric motor that drives the compression unit, a motor drive circuit that drives the electric motor, and the motor drive circuit. The motor wiring includes a plurality of conductors having an insulating coating, including a conductive member, a motor wiring drawn from the electric motor, and a connection terminal for electrically connecting the conductive member and the motor wiring. The connection terminal has a connection portion that is electrically connected to the motor wiring, and in the connection portion, the lead wire and the connection terminal are crimped while the insulating coating is melted. The electric compressor is a tubular motor having openings at both ends and is provided with a heat-shrinkable tube that covers the connection portion. The heat-shrinkable tube includes both ends and extends over a predetermined length to the motor. It is shrunk along the wiring.

According to this, the connection portion is housed in the heat shrink tubing. In the vicinity of the connection part, when the insulating film of the motor wiring is removed by heat and electrically connected to the connection part, even if the insulating film melts and foreign matter is generated, the end of the heat shrink tube on the electric motor side. By shrinking the portion having a predetermined length including the above along the motor wiring, it is possible to narrow the gap with the wiring and prevent foreign matter from coming out of the heat-shrinkable tube through this end portion. Further, in the portion of the predetermined length including the end portion of the heat-shrinkable tube on the conductive member side, the heat-shrinkable tube contracts not only along the connection terminal but also along the motor wiring, so that the gap between the motor wiring and the connection terminal is formed. Is narrowing. That is, the motor wiring is used to narrow the gap at the end of the heat-shrinkable tube on the conductive member side, and the gap is likely to be narrowed, and it is possible to prevent foreign matter from coming out of the heat-shrinkable tube through this end. By reducing the gaps at both ends of the heat-shrinkable tube in this way and making the inside a space for accommodating the connection portion, it is possible to suppress foreign matter from coming out from both ends of the heat-shrinkable tube. Due to the requirement to supply a large current to the electric motor to drive it, even if the diameter of the heat-shrinkable tube before heat shrinkage increases due to the increase in the diameter of the motor wiring due to the increase in the number of conductors, The gap between the motor wiring and the heat shrink tube does not change significantly. Therefore, it is possible to suitably reduce the gaps at both ends of the heat-shrinkable tube.

An electric compressor for solving the above problems is electrically connected to a compression unit that compresses a fluid, an electric motor that drives the compression unit, a motor drive circuit that drives the electric motor, and the motor drive circuit. The motor wiring includes a plurality of conductors having an insulating coating, including a conductive member, a motor wiring drawn from the electric motor, and a connection terminal for electrically connecting the conductive member and the motor wiring. The connection terminal has a connection portion that is electrically connected to the motor wiring, and in the connection portion, the lead wire and the connection terminal are crimped while the insulating coating is melted. The electric compressor is provided with a protective tube that covers the motor wiring and a heat-shrinkable tube that has an opening at both ends and covers the connection portion. The motor wiring is contracted along the motor wiring including one end on the conductive member side, and the other end on the electric motor side of the two ends is included over the predetermined length. It is shrunk along the protective tube.

According to this, the connection portion is housed in the heat shrink tubing. In the vicinity of the connection part, when the insulating film of the motor wiring is removed by heat and electrically connected to the connection part, even if the insulating film melts and foreign matter is generated, the end of the heat shrink tube on the electric motor side. By shrinking the portion having a predetermined length including the protective tube along the protective tube, it is possible to narrow the gap with the protective tube and prevent foreign matter from coming out of the heat-shrinkable tube through this end portion. Further, in the portion of the predetermined length including the end portion of the heat-shrinkable tube on the conductive member side, the heat-shrinkable tube contracts not only along the connection terminal but also along the motor wiring, so that the gap between the motor wiring and the connection terminal is formed. Is narrowing. That is, the motor wiring is used to narrow the gap at the end of the heat-shrinkable tube on the conductive member side, and the gap is likely to be narrowed, and it is possible to prevent foreign matter from coming out of the heat-shrinkable tube through this end. By reducing the gaps at both ends of the heat-shrinkable tube in this way and making the inside a space for accommodating the connection portion, it is possible to suppress foreign matter from coming out from both ends of the heat-shrinkable tube. Due to the requirement to supply a large current to the electric motor to drive it, the diameter of the heat-shrinkable tube and protective tube before heat-shrinking has increased as the diameter of the motor wiring has increased due to the increase in the number of conductors. However, the gap between the motor wiring and the heat-shrinkable tube and the gap between the protective tube and the heat-shrinkable tube do not change relatively significantly. Therefore, it is possible to suitably reduce the gaps at both ends of the heat-shrinkable tube.

In the electric compressor, the heat-shrinkable tube may have a tubular tube body having openings at both ends and an adhesive layer made of an adhesive provided on the inner peripheral surface of the tube body.

According to this, in the heat-shrinkable tube, the foreign matter can be adhered to the adhesive layer, so that the foreign matter can be easily retained in the heat-shrinkable tube. Therefore, it is possible to easily prevent foreign matter from coming out of the heat-shrinkable tube.

It is possible to prevent foreign substances generated by fusing from entering other parts.

A side sectional view schematically showing an electric compressor in an embodiment. The perspective view which shows the connector schematically. The cross-sectional view schematically showing the relationship between the heat shrink tube before heat shrink, the connection terminal, and the motor wiring. Sectional drawing which shows the connector schematically. FIG. 4 is a sectional view taken along line 5-5 in FIG. FIG. 4 is a sectional view taken along line 6-6 in FIG. FIG. 4 is a sectional view taken along line 7-7 in FIG. FIG. 6 is a sectional view schematically showing a connector in another embodiment.

Hereinafter, an embodiment embodying the electric compressor will be described with reference to FIGS. 1 to 7.
As shown in FIG. 1, the housing 11 of the electric compressor 10 has a motor housing 12 and a discharge housing 13. The motor housing 12 has a bottomed tubular shape having an opening 12a formed closer to the discharge housing 13. The discharge housing 13 has a bottomed tubular shape connected to the motor housing 12. The motor housing 12 has a bottom plate 121 and a peripheral wall 122 extending in a cylindrical shape from the outer peripheral portion of the bottom plate 121. A bottomed cylindrical inverter cover 14 is attached to the bottom plate 121 of the motor housing 12. A discharge chamber S1 is partitioned between the motor housing 12 and the discharge housing 13. A discharge port 15 is formed on the bottom wall 131 of the discharge housing 13. An external refrigerant circuit (not shown) is connected to the discharge port 15. A suction port 123 is formed on the peripheral wall 122 of the motor housing 12. An external refrigerant circuit (not shown) is connected to the suction port 123.

A rotating shaft 16 is housed in the motor housing 12. A compression unit 17 that compresses the refrigerant as a fluid and an electric motor 18 that drives the compression unit 17 are housed in the motor housing 12. The electric motor 18 drives the rotary shaft 16. The compression unit 17 is driven by the rotation of the rotation shaft 16. The electric motor 18 is located closer to the bottom plate 121 of the motor housing 12 than the compression portion 17.

In the motor housing 12, a shaft support member 19 is provided between the compression unit 17 and the electric motor 18. An insertion hole 19a through which the first end portion 16a of the rotating shaft is inserted is formed in the central portion of the shaft support member 19. A radial bearing 16c is provided between the insertion hole 19a and the first end portion 16a of the rotating shaft 16. The first end portion 16a of the rotating shaft 16 is rotatably supported by the shaft support member 19 via the radial bearing 16c. The motor housing chamber S2 is partitioned by the bottom plate 121 and the peripheral wall 122 of the motor housing 12, and the shaft support member 19. The motor accommodating chamber S2 functions as a suction chamber in which the refrigerant introduced from the suction port 123 is sucked into the compression unit 17. The shaft support member 19 is formed with a communication passage 19b that connects the motor accommodating chamber S2 and the compression portion 17.

A bearing portion 121a is provided on the bottom plate 121 of the motor housing 12. The second end portion 16b of the rotating shaft 16 is inserted inside the bearing portion 121a. A radial bearing 16d is provided between the bearing portion 121a and the second end portion 16b of the rotating shaft 16. The second end portion 16b of the rotating shaft 16 is rotatably supported by the bearing portion 121a via the radial bearing 16d.

The accommodation space S3 is partitioned by the bottom plate 121 of the motor housing 12 and the inverter cover 14. In the accommodation space S3, a motor drive circuit 20 for driving the electric motor 18 is attached to the outer surface of the bottom plate 121 near the inverter cover 14. Therefore, in the present embodiment, the compression unit 17, the electric motor 18, and the motor drive circuit 20 are arranged side by side in this order in the axial direction, which is the extending direction of the axis L of the rotating shaft 16.

The compression unit 17 includes a fixed scroll 17a fixed in the motor housing 12 and a movable scroll 17b arranged so as to face the fixed scroll 17a. A compression chamber S4 whose volume can be changed is partitioned between the fixed scroll 17a and the movable scroll 17b. The refrigerant sucked from the motor accommodating chamber S2 and compressed in the compression chamber S4 is discharged to the discharge chamber S1.

The electric motor 18 includes a rotor 21 that rotates integrally with the rotating shaft 16 and a stator 22 that is fixed to the inner peripheral surface of the motor housing 12 so as to surround the rotor 21.

The rotor 21 has a rotor core 23 having a cylindrical shape. The rotor core 23 is fastened to the rotating shaft 16. A plurality of permanent magnets 24 are embedded in the rotor core 23. The plurality of permanent magnets 24 are provided at equal intervals in the circumferential direction of the rotor core 23. The stator 22 has a stator core 25 and U-phase, V-phase, and W-phase coils 26. The stator core 25 has an annular shape fixed to the inner peripheral surface of the motor housing 12.

The first coil end 261 of each phase protrudes from the first end surface 251 of the stator core 25. The second coil end 262 of each phase protrudes from the second end surface 252 of the stator core 25. The first coil end 261 is located closer to the compression portion 17. The second coil end 262 is located closer to the motor drive circuit 20.

The motor wiring 30 is drawn out from the second coil end 262 of each phase. As shown in FIG. 3, the motor wiring 30 includes eight conductors 30a and an insulating coating H covering the conductors 30a. The eight conductors 30a are bundled together. That is, the motor wiring 30 is formed by bundling a plurality of conductor wires 30a having an insulating coating H.

As shown in FIG. 1 or 2, a hole 121b is formed in the bottom plate 121 of the motor housing 12. An airtight terminal 33 is provided in the hole 121b. The airtight terminal 33 has three conductive members 34 corresponding to the U-phase, V-phase, and W-phase coils 26. Note that FIG. 1 illustrates only one conductive member 34. Each conductive member 34 is a columnar metal terminal extending linearly. Each conductive member 34 is inserted into the hole 121b, and the first end portion 34a is electrically connected to the motor drive circuit 20. The second end portion 34b of each conductive member 34 projects from the accommodation space S3 into the motor housing 12 via the hole 121b. Further, the airtight terminal 33 has three insulating members 35. Note that FIG. 1 illustrates only one insulating member 35. Each insulating member 35 fixes each conductive member 34 while insulating it from the bottom plate 121. Each insulating member 35 is made of glass.

A connector 40 for connecting the motor wiring 30 and the conductive member 34 is housed in the motor housing 12. The connector 40 is arranged between the electric motor 18 and the bottom plate 121 in the axial direction of the rotating shaft 16.

As shown in FIG. 2 or 4, the connector 40 has three connection terminals 50 corresponding to the U-phase, V-phase, and W-phase coils 26, and a cluster block 60 made of an insulating resin. Be prepared. Note that FIG. 4 illustrates only one connection terminal 50 corresponding to the U-phase coil 26. Further, since all three connection terminals 50 have the same structure, the structure of one connection terminal 50 will be described, and the description of the structure of the other two connection terminals 50 will be omitted.

The connection terminal 50 electrically connects the conductive member 34 of each phase and the motor wiring 30 which is individually electrically connected to the conductive member 34 of each phase. The connection terminal 50 is made of a conductive material. For example, the connection terminal 50 is made of copper. The connection terminal 50 has a motor wiring connection portion 51 electrically connected to the motor wiring 30 and a conductive member connection portion 52 electrically connected to the conductive member 34. In the connection terminal 50, the motor wiring connection portion 51 is elongated, and the conductive member connection portion 52 is continuous with one end of the motor wiring connection portion 51 in the longitudinal direction. The motor wiring connection portion 51 is electrically connected to the motor wiring 30 connected to one connection terminal 50. The connecting portion 52 for the conductive member is electrically connected to the conductive member 34. The motor wiring connection portion 51 corresponds to the connection portion according to the claim.

As shown in FIG. 4 or FIG. 6, in the connection terminal 50, the motor wiring connection portion 51 is integrated with the elongated plate-shaped support plate 51a, the two side walls 51b integrated with the support plate 51a, and the support plate 51a. It has a caulking portion 51c. The two side walls 51b are arranged closer to the connecting portion 52 for the conductive member in the longitudinal direction of the support plate 51a. The two side walls 51b are arranged closer to the connecting portion 52 for the conductive member than the caulking portion 51c in the longitudinal direction of the support plate 51a.

As shown in FIG. 6, one side wall 51b of the two side walls 51b rises from one of the two long edges of the support plate 51a, and the other side wall 51b is the other long edge of the support plate 51a. Get up from. The two side walls 51b hold the motor wiring 30 mounted on the support plate 51a in a state of being supported by the support plate 51a.

As shown in FIG. 7, the caulking portion 51c crimps the tip portion of the motor wiring 30 near the connecting portion 52 for the conductive member. The caulking portion 51c surrounds the motor wiring 30 in a state of being in contact with each other, and presses the motor wiring 30 toward the motor wiring connecting portion 51. The motor wiring 30 is mechanically connected to the connection terminal 50 by being crimped by the caulking portion 51c.

As shown in FIG. 4, at a position where the motor wiring 30 is mechanically connected to the motor wiring connection portion 51, the insulating coating H is removed by heat to expose the eight conductors 30a. The electric compressor 10 has a binding portion 36 in which eight conducting wires 30a exposed at the tip end portion of the motor wiring 30 are bundled. In the binding portion 36, adjacent conductors 30a are in contact with each other. Further, in the binding portion 36, some of the eight conductors 30a are in contact with the motor wiring connection portion 51. Therefore, the binding portion 36 is electrically connected to the motor wiring connection portion 51, and the motor wiring 30 and the motor wiring connection portion 51 are electrically connected to each other. Therefore, the binding portion 36 in which the conducting wire 30a exposed by removing the insulating coating H of the motor wiring 30 by heat is electrically connected to the connecting portion 51 for motor wiring.

The electric compressor 10 has a mechanical connection point S between the motor wiring 30 and the motor wiring connection portion 51. This connection point S is also an electrical connection point between the motor wiring 30 and the motor wiring connection portion 51. In the present embodiment, the connection portion S is a portion where the caulking portion 51c is provided. The binding portion 36 projects from the caulking portion 51c constituting the connection portion S toward the conductive member connecting portion 52. In the present embodiment, the tip surface 36a of the binding portion 36 is located in the vicinity of the connecting portion 52 for the conductive member, but is not in contact with the connecting portion 52 for the conductive member. Further, foreign matter G generated when the insulating film H is removed by heat may adhere to the connection portion S and remain.

In each phase, a heat shrink tube 70 is provided on the outer peripheral side of the bundle of motor wiring 30. The heat shrink tube 70 has a cylindrical shape having openings at both ends. The heat-shrinkable tube 70 covers the motor wiring 30 and the connection terminal 50 from the outer peripheral side, including the electrical connection portion S between the binding portion 36 and the motor wiring connection portion 51. The heat-shrinkable tube 70 has a first end portion 70a at one of both ends in the longitudinal direction of the heat-shrinkable tube 70, and a second end portion 70b at the other end. The first end 70a of the heat-shrinkable tube 70 is an end closer to the electric motor 18 along the motor wiring 30 than the connection point S. In FIG. 5, the first end portion 70a of the heat-shrinkable tube 70 is in contact with the insulating coating H of the bundle of the conducting wires 30a at a position closer to the electric motor 18 along the motor wiring 30 than the connection portion S. Therefore, the portion having a predetermined length including the first end portion 70a of the heat-shrinkable tube 70 is contracted along the motor wiring 30. Therefore, there is only a slight gap between the inner surface of the first end 70a of the heat shrink tubing 70 and the outer surface of the bundle of conductors 30a. Further, there is only a slight gap between the conductors 30a.

The second end portion 70b of the heat-shrinkable tube 70 is an end portion closer to the connection portion 52 for the conductive member along the motor wiring 30 than the connection portion S, and is an end portion located on the opposite side of the first end portion 70a. Is.

As shown in FIG. 6, the second end portion 70b of the heat-shrinkable tube 70 is an outer surface of the outer surface of the binding portion 36 protruding from the connection portion S, which is located on the side opposite to the support plate 51a, and the connection portion 51 for motor wiring. It is in contact with the outer surface of the support plate 51a and the outer surface of the two side walls 51b. That is, the second end portion 70b is in contact with the binding portion 36 and the connection terminal 50 near the tip surface 36a of the binding portion 36. Therefore, the portion having a predetermined length including the second end portion 70b of the heat shrink tube 70 is shrunk along the motor wiring 30. Further, the tip surface 70c of the second end portion 70b of the heat-shrinkable tube 70 is flush with the tip surface 36a of the binding portion 36. Therefore, the tip surface 36a of the binding portion 36 is not covered with the heat-shrinkable tube 70 and is exposed to the outside of the heat-shrinkable tube 70.

Therefore, there is only a small amount between the inner surface of the second end 70b of the heat-shrinkable tube 70, the outer surface of the binding portion 36, the outer surface of the support plate 51a of the motor wiring connection portion 51, and the outer surface of the two side walls 51b. There is only a small gap. Further, there is only a slight gap between the conductors 30a in the binding portion 36. The slight gaps formed in the first end portion 70a and the second end portion 70b are minute gaps through which the foreign matter G cannot pass.

Therefore, the space inside the heat shrink tubing 70 is substantially sealed at the first end 70a and the second end 70b. The connection portion S between the motor wiring 30 connected to the connection terminal 50 and the motor wiring connection portion 51 is confined in the heat shrink tube 70. Therefore, the foreign matter G generated at the connection portion S is also confined in the heat-shrinkable tube 70.

As shown in FIG. 2 or 4, the conductive member connecting portion 52 is continuous with the motor wiring connecting portion 51. The connecting portion 52 for the conductive member has, for example, a substantially square cylinder shape.
The connection portion 52 for conductive members includes a bottom wall 52a continuous with the support plate 51a along the longitudinal direction of the support plate 51a of the connection portion 51 for motor wiring, and a peripheral wall 52b rising from the outer peripheral portion of the bottom wall 52a. ing. The conductive member 34 is inserted into the portion surrounded by the peripheral wall 52b. The conductive member 34 inserted into the conductive member connecting portion 52 comes into contact with the conductive member connecting portion 52, so that the conductive member connecting portion 52 and the conductive member 34 are electrically connected. Therefore, the motor wiring 30 and the conductive member 34 connected to the connection terminal 50 are electrically connected via the motor wiring connection portion 51 and the conductive member connection portion 52.

The cluster block 60 has three accommodation holes 64. Each accommodation hole 64 opens the cluster block 60 to the outside. The cluster block 60 is formed with a through hole 63 that communicates the inside of each accommodating hole 64 with the outside of the cluster block 60. The diameter of the through hole 63 is larger than the outer diameter of the conductive member 34 inserted into the through hole 63.

Next, an example of the procedure for assembling the connector 40 will be described. In the connection terminal 50, the crimped portion 51c is not crimped.
For each of the eight conductors 30a, the eight conductors 30a are supported by the support plate 51a while being held between the two side walls 51b in a state where the insulating coating H is not removed. At this time, the tip end portion of the motor wiring 30 protrudes closer to the connecting portion 52 for the conductive member than the caulking position by the caulking portion 51c. After that, the crimped portion 51c is crimped, and the tip portion of the motor wiring 30 is mechanically connected to the motor wiring connecting portion 51 by the caulked portion 51c. Next, using a resistance welding power source (not shown), electricity is passed through the crimped portion 51c to pressurize the motor wiring connection portion 51 including the crimped portion 51c and the motor wiring 30 while heating. So-called fusing is performed. Then, the insulating coating H is melted to expose the conducting wire 30a, and the caulking portion 51c, the support plate 51a, and the conducting wire 30a are crimped. The eight conductors 30a are electrically connected to the motor wiring connection portion 51. At this time, a binding portion 36 is formed at the connection portion S.

Next, as shown in FIG. 3, the motor wiring 30 and the connection terminal 50 connected to the connection terminal 50 are inserted into the heat shrink tube 70 from the opening near the first end 70a of the heat shrink tube 70 before heat shrink. do. Then, the connection portion S is located inside the heat-shrinkable tube 70 before heat shrinkage, and the heat-shrinkable tube 70 is arranged at a position where the first end portion 70a exceeds the connection terminal 50 along the motor wiring 30. At this time, in the second end portion 70b of the heat shrinkable tube 70 before heat shrinkage, the tip surface 70c of the second end portion 70b is substantially flush with the tip surface 36a of the binding portion 36.

The inner diameter of the heat-shrinkable tube 70 before heat-shrinking is a dimension through which the connecting portion 52 for the conductive member can pass. The inner diameter of the heat-shrinkable tube 70 before heat-shrinking is such that the eight conductors 30a and the motor wiring connection portion 51 can pass through. Therefore, as the number of conductors 30a of the motor wiring 30 connected to the connection terminal 50 increases, the inner diameter of the heat-shrinkable tube 70 before heat-shrinking increases.

Next, the heat-shrinkable tube 70 is heated in a state where the first end portion 70a of the heat-shrinkable tube 70 before heat-shrinking overlaps with the insulating coating H of the eight conducting wires 30a. Then, as shown in FIG. 4, the heat-shrinkable tube 70 is heat-shrinked, and the first end portion 70a of the heat-shrinkable tube 70 comes into contact with the insulating coating H of the bundle of the conducting wires 30a. Further, the second end portion 70b of the heat-shrinkable tube 70 comes into contact with the binding portion 36 and the motor wiring connecting portion 51. At this time, the tip surface 36a of the binding portion 36 is exposed to the outside of the heat-shrinkable tube 70.

In the above embodiment, the following actions and effects can be obtained.
(1) A motor wiring connection portion 51 is housed in the heat-shrinkable tube. In the vicinity of the motor wiring connection portion 51, when the insulation coating H of the motor wiring 30 is removed by heat and electrically connected to the motor wiring connection portion 51, the insulation coating H melts and foreign matter G is generated. Also, a portion of a predetermined length including the first end 70a of the heat shrink tube 70 shrinks along the motor wiring 30. Therefore, it is possible to narrow the gap with the motor wiring 30 and prevent foreign matter G from coming out of the heat-shrinkable tube 70 through this end portion. Further, a portion having a predetermined length including the second end 70b of the heat-shrinkable tube 70 is contracted so that the heat-shrinkable tube 70 contracts not only along the connection terminal 50 but also along the motor wiring 30, so that the motor wiring 30 and the connection can be made. The gap with the terminal 50 is narrowed. That is, the motor wiring 30 is used in the second end 70b of the heat-shrinkable tube to narrow the gap, and the gap is likely to be narrowed, and foreign matter G can be suppressed from coming out of the heat-shrinkable tube 70 through this end. .. By reducing the gaps on both sides of the heat-shrinkable tube 70 in this way to make the inside a space for accommodating the motor wiring connection portion 51, it is possible to prevent foreign matter G from coming out from both ends of the heat-shrinkable tube 70. It should be noted that, due to the background that a large current is required to be supplied to the electric motor 18 to drive it, even if the diameter of the heat shrink tube 70 is increased due to the increase in the diameter of the motor wiring 30 due to the increase in the number of the conducting wires 30a, the diameter is increased. The gap between the motor wiring 30 and the heat shrink tube 70 does not change significantly. Therefore, it is possible to suitably reduce the gaps at both ends of the heat-shrinkable tube 70.

The above embodiment can be modified and implemented as follows. The above embodiment and the following modified examples can be implemented in combination with each other within a technically consistent range.

○ As shown in FIG. 8, the motor wiring 30 connected to the connection terminal 50 may be inserted into the protective tube 80. The protective tube 80 covers all of the eight conductors 30a forming the motor wiring 30 from the outer peripheral side. In this case, the first end 70a of the heat-shrinkable tube 70 contracts along the outer surface 81 of the protective tube 80 to narrow the gap between the protective tube 80 and the first end 70a of the heat-shrinkable tube 70. It is possible to prevent foreign matter G from coming out of the heat-shrinkable tube 70 through one end 70a. By reducing the gaps on both sides of the heat-shrinkable tube 70 in this way to make the inside a space for accommodating the motor wiring connection portion 51, it is possible to prevent foreign matter G from coming out from both ends of the heat-shrinkable tube 70. Since it is required to supply a large current to the electric motor 18 to drive it, the diameter of the motor wiring 30 is increased by increasing the number of the conducting wires 30a. With this increase in diameter, even if the diameter of the heat-shrinkable tube 70 and the protective tube 80 before heat shrinkage increases, the gap between the motor wiring 30 and the heat-shrinkable tube 70 and the gap between the protective tube 80 and the heat-shrinkable tube 70 remain. It does not change significantly. Therefore, it is possible to suitably reduce the gaps at both ends of the heat-shrinkable tube 70.

○ In the embodiment, the heat-shrinkable tube 70 may have a tubular body having openings at both ends and an adhesive layer made of an adhesive provided on the inner peripheral surface of the tube body. .. In this case, in the heat-shrinkable tube 70, the foreign matter G generated at the connection portion S can be adhered to the adhesive layer, so that the foreign matter G can be easily fastened to the inside of the heat-shrinkable tube 70. As a result, it is possible to further suppress foreign matter G from coming out of the heat-shrinkable tube 70.

○ In the embodiment, the tip surface 70c of the second end portion 70b of the heat shrink tube 70 does not have to be flush with the tip surface 36a of the binding portion 36. In short, the tip surface 36a of the binding portion 36 may be exposed to the outside of the heat-shrinkable tube 70.

○ In the embodiment, the number of phases of the coil 26 may be changed.
○ In the embodiment, the number of the conducting wires 30a forming the coil 26 may be appropriately changed.

○ In the embodiment, the compression unit 17 is not limited to the type composed of the fixed scroll 17a and the movable scroll 17b, and may be changed to, for example, a piston type or a vane type.

○ In the embodiment, a part of the insulating coating H may remain formed on the peripheral surface of the conducting wire 30a in the vicinity of the tip surface 36a. In this case, the heat-shrinkable tube 70 is in close contact with the insulating coating H.

○ In the embodiment, the crimped portion 51c, the support plate 51a, and the conducting wire 30a may be welded to each other.

10 ... Electric compressor, 17 ... Compressor, 18 ... Electric motor, 20 ... Motor drive circuit, 30 ... Motor wiring, 30a ... Conduction wire, 34 ... Conductive member, 50 ... Connection terminal, 51 ... For motor wiring as connection part Connection part, 70 ... heat shrinkable tube, 80 ... protective tube, H ... insulating film.

Claims (3)

A compression part that compresses the fluid,
An electric motor that drives the compression unit and
The motor drive circuit that drives the electric motor and
A conductive member electrically connected to the motor drive circuit,
The motor wiring drawn from the electric motor and
A connection terminal for electrically connecting the conductive member and the motor wiring is provided.
The motor wiring is formed by bundling a plurality of conductors having an insulating coating.
The connection terminal has a connection portion that is electrically connected to the motor wiring.
An electric compressor in which the conducting wire and the connecting terminal are crimped to each other while the insulating coating is melted at the connecting portion.
It has a cylindrical shape with openings at both ends and is provided with a heat-shrinkable tube that covers the connection.
The heat-shrinkable tube is an electric compressor including both ends and is shrunk along the motor wiring over a predetermined length. A compression part that compresses the fluid,
An electric motor that drives the compression unit and
The motor drive circuit that drives the electric motor and
A conductive member electrically connected to the motor drive circuit,
The motor wiring drawn from the electric motor and
A connection terminal for electrically connecting the conductive member and the motor wiring is provided.
The motor wiring is formed by bundling a plurality of conductors having an insulating coating.
The connection terminal has a connection portion that is electrically connected to the motor wiring.
An electric compressor in which the conducting wire and the connecting terminal are crimped to each other while the insulating coating is melted at the connecting portion.
A protective tube for covering the motor wiring and a heat-shrinkable tube having openings at both ends and covering the connection portion are provided.
The heat-shrinkable tube is contracted along the motor wiring over a predetermined length including one end of the both ends on the conductive member side, and the other end of the both ends on the electric motor side is contracted. An electric compressor comprising and being shrunk along the protective tube over a predetermined length. Claim 1 or claim, wherein the heat-shrinkable tube has a tubular body having openings at both ends and an adhesive layer made of an adhesive provided on the inner peripheral surface of the tube body. Item 2. The electric compressor according to item 2.

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