JP2006250145A - Electric compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric compressor with significantly improved insulation performance, which is sealed easily and surely. <P>SOLUTION: A sealing member 100 is disposed to each drive casing 11, 23 and surrounds a lead 90 which supplies electric power from a drive circuit 98 outside the drive casing to a motor 40. The lead includes: an input part 92 connected with the motor; an intermediate part 94 continuous to the input part, surrounded by the sealing member, and passing through the drive casing; and an output part 96 continuous to the intermediate part and connected with the drive circuit. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an electric compressor, and more particularly to an electric compressor suitable for being incorporated in a refrigeration circuit or the like of an air conditioning system of a vehicle.

This type of compressor includes a drive unit and a compression unit, and the compression unit is provided with a compression unit that performs a series of processes of refrigerant suction, compression, and discharge.
For example, a scroll compressor is provided with a fixed scroll and a movable scroll that mesh with each other, and the movable scroll orbits with respect to the fixed scroll. Thereby, the volume of the space formed by each scroll is reduced, and the above-described series of processes is performed. On the other hand, this unit is driven by a rotating shaft, and the rotating shaft is driven by energizing a motor. These rotating shafts and motors are provided in the drive unit.

Here, the motor is electrically connected to a drive circuit disposed outside the compressor via a lead wire, and in order to supply electric power to the motor, a measure for insulating the lead wire is essential. For this reason, the technique of ensuring the insulation distance of a housing and a lead wire by filling the inside of the housing of a compressor with insulating resin is disclosed (for example, patent document 1).
In addition, the lead wire is connected to the drive circuit via a sealed terminal. However, when the internal pressure of the housing increases, there is a concern that the refrigerant leaks out of the housing from the portion where the sealed terminal is provided. Therefore, with regard to the seal between the lead wire and the sealing terminal, there is a technique in which a resin material is fitted to a metal body that is a conductive portion, and the metal body and the resin material are sealed using plastic deformation of the resin material due to pressurization. It is disclosed (for example, Patent Documents 2 and 3).
JP-A-6-235388 JP 7-55011 A JP-A-7-127746

By the way, in order to improve the insulation performance, it is desirable to reduce as much as possible the places where current can leak. In other words, it is necessary to eliminate the above-described sealed terminal and omit the connection portion between the lead wire and the sealed terminal.
However, the insulation and seal improvements based on the premise of the presence of a sealed terminal as in the prior art described above cannot be expected to significantly improve the insulation performance in view of the large number of parts and the complexity of assembly work. There is still a problem with respect to improving performance.

In order to prevent leakage of the refrigerant from the housing, attention must be paid not only to the seal between the lead wire and the sealed terminal, but also to the seal between the sealed terminal and the housing. The conventional technique does not give special consideration to this point.
The present invention has been made in view of such problems, and an object of the present invention is to provide an electric compressor capable of greatly improving insulation performance and performing simple and reliable sealing.

  In order to achieve the above object, an electric compressor according to claim 1 is formed in a drive casing and a housing having a compression casing that is airtightly fitted to the drive casing, and is rotatably supported. A machine room having a motor that drives the rotating shaft by energization, a compression unit that is housed in the compression casing and is driven by the rotating shaft to perform a series of refrigerant suction, compression, and discharge processes, and a drive casing And a sealing member surrounding a lead wire for supplying electric power to the motor from a driving circuit outside the driving casing. The lead wire is connected to the motor, and the lead wire is connected to the input unit. And an output part connected to the drive circuit and connected to the intermediate part.

In the invention according to claim 2, the sealing member extends from the inner end surface of the drive casing toward the drive casing, and is driven from the inner cylindrical portion having the bus bar length as an insulation distance, and from the outer end surface of the drive casing. And an outer cylindrical portion that extends toward the outside of the casing and has a bus bar length as an insulation distance.
Furthermore, the invention according to claim 3 further includes a pressing plate that is brought into contact with the drive casing from the outside and presses the sealing member by the axial force of the bolt, and the sealing member is airtightly fitted to the driving casing. The inner truncated cone cylinder portion that is expanded toward the outside of the drive casing and the outer trim cone portion that is connected to the holding plate in an airtight manner and is reduced in diameter toward the outside of the drive casing. And a conical cylinder portion.

  Furthermore, in the invention according to claim 4, the sealing member extends from the inner end face of the drive casing toward the drive casing, and is fitted into the drive casing in an airtight manner with an inner cylindrical portion having a bus bar length as an insulation distance. And is connected to the truncated conical cylinder portion that is reduced in diameter toward the outside of the drive casing and the truncated cone cylinder portion, and extends from the outer end surface of the drive casing toward the outside of the drive casing to insulate the length of the bus bar. It is characterized by including an outer cylindrical portion having a male screw portion on its outer periphery and a nut that is screwed into the male screw portion and abuts against the drive casing from the outside.

According to a fifth aspect of the present invention, the motor is disposed around the rotating shaft and has a permanent magnet that is rotated integrally with the rotating shaft, and is disposed around the rotor, and rotates the rotor by rotating the magnetic field. And the inner cylindrical portion has a receiving portion fitted from the outside to the stator.
Furthermore, the invention according to claim 6 further includes a pressing plate that is brought into contact with the drive casing from the outside and presses the sealing member by the axial force of the bolt, and the sealing member is airtightly fitted to the driving casing. And a truncated conical cylinder portion that is connected to the holding plate and is hermetically fitted to the pressing plate and is reduced in diameter toward the outside of the drive casing.

  Furthermore, the invention according to claim 7 further includes a pressing plate that is brought into contact with the drive casing from the outside and presses the sealing member by the axial force of the bolt, and the pressing plate is attached to the driving casing via the bolt. The fixing unit includes an abutting fixing part, a taper part that is connected to the inner peripheral side of the fixing part, is hermetically fitted to the sealing member, and is reduced in diameter toward the outside of the driving casing.

  The invention according to claim 8 is characterized in that one or a plurality of lead wires are formed for each phase of the motor.

  Therefore, according to the electric compressor of the present invention described in claim 1, the lead wire is surrounded by the sealing member and penetrates the drive casing, and the input portion on one end side of the intermediate portion is connected to the motor. On the other hand, the output portion on the other end side of the intermediate portion is connected to an external drive circuit, and the lead wire in the drive casing is pulled out to the outside of the drive casing as it is. Therefore, the conventional sealed terminal device is not required, and specifically, the connecting portion between the lead wire and the sealed terminal can be omitted. Therefore, the locations where current can leak are reduced, and the insulation performance is greatly improved.

Further, the omission of the connecting portion between the lead wire and the sealing terminal can eliminate the need for the resin filling operation in the housing as in the prior art, improving the production efficiency of the compressor, and the compressor. It becomes easy to reuse the components.
According to the second aspect of the present invention, the lead wire surrounded by the sealing member and penetrating the drive casing is surrounded by each cylindrical portion on the inner side and the outer side of the drive casing, and the bus bar length of these cylindrical portions is Insulation distance. Therefore, the drive casing and the lead wire are reliably insulated, and the insulation performance is greatly improved.

Moreover, as a result of eliminating the need for the conventional sealed terminal device, the assembly of the lead wire to the drive casing is improved.
According to the third aspect of the present invention, each truncated conical cylinder portion is deformed by the axial force of the bolt and is fitted into the drive casing and the holding plate in an airtight manner by the action of the wedge. Therefore, in addition to the seal between the lead wire and the sealing member, the seal between the sealing member and the drive casing is also achieved. As a result, the number of parts related to the seal is reduced as compared with the conventional case, and the sealing process is simplified, and the manufacturing cost can be reduced.

  According to the fourth aspect of the present invention, the truncated conical cylinder portion is deformed by the axial force generated by the male screw and the nut, and is fitted into the drive casing in an airtight manner by the action of the wedge. Therefore, in addition to the seal between the lead wire and the sealing member, the seal between the sealing member and the drive casing is also achieved. In addition, in this case, a pressing plate that presses the sealing member from the outside of the drive casing becomes unnecessary, and a further reduction in manufacturing cost can be achieved.

In addition, since the lead wire is surrounded by each cylindrical portion whose bus length is the insulation distance inside and outside the drive casing, the drive casing and the lead wire are reliably insulated, and the insulation performance is dramatically improved. improves.
Furthermore, according to the fifth aspect of the present invention, since the inner cylindrical portion is fixed to the stator, the sealing member can be easily positioned.

According to the sixth aspect of the present invention, the truncated conical cylinder portion is deformed by the axial force of the bolt, and is fitted into the drive casing and the holding plate in an airtight manner by the action of the wedge. Therefore, also in this case, the seal between the sealing member and the drive casing is achieved in addition to the seal between the lead wire and the sealing member.
According to the seventh aspect of the present invention, since only the pressing plate is configured to deform the sealing member, it is not necessary to process the drive casing, and the lead wire is sealed with the existing drive casing. The seal between the member and the seal between the sealing member and the drive casing is achieved, and the manufacturing cost can be reduced.

  Furthermore, according to the eighth aspect of the invention, the configuration of one lead wire for each phase, for example, a single-phase motor has one lead wire and a three-phase motor has three lead wires. The sealing member also matches the number of lead wires. As a result, it is possible to reduce the size of the sealing device with respect to the drive casing, which contributes to downsizing of the compressor.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows an electric compressor 4 according to the first embodiment.
The electric compressor 4 includes a housing 20 extending in the horizontal direction, and the compressor 4 is incorporated in a refrigeration circuit of a vehicle air conditioning system. Specifically, in this refrigeration circuit, a compressor 4, a gas cooler (not shown), an expansion valve, and an evaporator are sequentially arranged. The compressor 4 is a natural refrigerant of CO ₂ refrigerant (hereinafter simply referred to as refrigerant). ), And the refrigerant is compressed and discharged toward the gas cooler.

  The housing 20 has a drive casing 22, a rear casing 23, and a compression casing 24. Both ends of the drive casing 22 are opened, and the compression casing 24 has a cup shape opened toward the drive casing 22, and the opening end and one end side of the drive casing 22 are airtightly fitted via bolts 28. Yes. The rear casing 23 also has a cup shape that opens toward the drive casing 22, and the opening end of the rear casing 23 and the other end side of the drive casing 22 are airtightly fitted via bolts 29. The drive casing 22 and the rear casing 23 may be formed integrally.

  An annular support block 46 is provided at the opening end portion on one end side of the drive casing 22, and a space between the support block 46 and, specifically, the bottomed portion of the rear casing 23 in the present embodiment is provided in the drive casing 22. A motor room (machine room) 26 is formed. A stepped rotary shaft 30 is disposed in the motor chamber 26, and the rotary shaft 30 has a small diameter shaft portion 32 and a large diameter shaft portion 34. The small diameter shaft portion 32 is rotatably supported by a boss 48 protruding from the bottomed portion of the rear casing 23 via a needle bearing 38, and the large diameter shaft portion 34 is rotatably supported by a support block 46 via a ball bearing 36. ing.

On the other hand, a suction port 25 communicating with the motor chamber 26 is formed in the peripheral wall of the rear casing 23. The suction port 25 is connected to the evaporator described above and is introduced into the motor chamber 26 as a suction refrigerant of the refrigeration circuit.
The rotating shaft 30 is driven by energizing the electric motor 40. Specifically, a brushless electric motor 40 is disposed in the motor chamber 26, and a rotor 42 having a rare earth permanent magnet, for example, a neodymium magnet, is fixed to the outer peripheral side of the rotating shaft 30. A stator 44 having an armature winding 43 is arranged.

  The electric motor 40 of the present embodiment is a three-phase synchronous or three-phase induction motor, and is disposed outside the compressor 4 and supplied with electric power from a drive circuit 98 having an inverter via a lead wire 90. (FIG. 2). This lead wire 90 is composed of one phase each, in other words, a total of three lead wires 90 are juxtaposed with the three-phase electric motor 40. Further, the surface of each lead wire 90 is covered with enamel or the like in the same manner as the armature winding 43, and the connection portion of the armature winding 43 or the connection between the armature winding 43 and the lead wire 90. The part is subjected to insulation treatment. When the armature winding 43 is energized via the lead wire 90, the rotor 42 rotates with the rotation of the magnetic field generated in the armature winding 43 and rotates integrally with the rotary shaft 30.

  Here, a scroll unit (compression unit) 52 is accommodated in the compression casing 24, and the scroll unit 52 includes a movable scroll 54 and a fixed scroll 56. The movable scroll 54 and the fixed scroll 56 have spiral wraps 61 and 79 that mesh with each other. The spiral wraps 61 and 79 cooperate with each other to form a compression chamber 58 through a seal (not shown). The compression chamber 58 moves from the radially outer peripheral side of the spiral wraps 61 and 79 toward the center by the orbiting movement of the movable scroll 54, and the volume thereof is reduced at this time.

  In order to achieve the turning motion of the movable scroll 54 described above, the substrate 60 of the movable scroll 54 has a boss 62 that protrudes toward the drive casing 22, and this boss 62 is provided with an eccentric bush 66 via a needle bearing 64. Is supported rotatably. The eccentric bush 66 is supported by a crank pin 68, and the crank pin 68 protrudes eccentrically from the large diameter shaft portion 34. Therefore, as the rotary shaft 30 rotates, the movable scroll 54 performs a turning motion via the crank pin 68 and the eccentric bush 66.

Further, a counterweight 70 is attached to the eccentric bush 66 between the eccentric bush 66 and the large-diameter shaft portion 34 via a connecting pin 71, and this counterweight 70 is a balance weight for the orbiting movement of the movable scroll 54. It becomes.
The fixed scroll 56 is fixed to the bottomed portion of the compression casing 24 through bolts 57, and the substrate 78 partitions the inside of the compression casing 24 from the compression chamber 58 side to the discharge chamber 80 side. A discharge hole 82 connected to the compression chamber 58 is formed in the center of the substrate 78, and the discharge hole 82 is opened and closed by a reed valve 84. The reed valve 84 is attached to the discharge chamber 80 side of the substrate 78 together with the valve retainer 86.

Further, a discharge port 87 communicating with the discharge chamber 80 is formed in the bottomed portion of the compression casing 24. The discharge chamber 80 is connected to the gas cooler through the discharge port 87, and is discharged into the refrigeration circuit as a discharge refrigerant. Discharge.
By the way, the compressor 4 of the present embodiment includes a resin sealing member 100 that surrounds the lead wire 90 and penetrates the rear casing 23.

  More specifically, as shown in FIGS. 2 and 3, the sealing member 100 includes an inner cylindrical portion 102 extending from the bottomed portion of the rear casing 23 toward the motor chamber 26, and the inner cylindrical portion 102. Is the insulation distance between the rear casing 23 and the lead wire 90. This insulation distance depends on the operating voltage, but is set to about 15 mm in this embodiment.

  Further, the sealing member 100 includes an inner truncated cone tube portion 104 whose diameter is increased toward the outside of the rear casing 23, and the truncated portion of the inner truncated cone tube portion 104 is continuous with the inner cylindrical portion 102. . Further, the sealing member 100 includes an outer truncated cone portion 106 that is reduced in diameter toward the outside of the rear casing 23, and a portion opposite to the truncated portion of the outer truncated cone portion 106 is an inner truncated cone portion. 104. The inner frustoconical cylinder portion 104 and the outer frustoconical cylinder portion 106 are formed to be slightly larger than the casing through hole 23h of the rear casing 23 and the presser plate through hole 110h of the presser plate 110.

  Furthermore, the sealing member 100 includes an outer cylindrical portion 108 extending from the outer end surface of the pressing plate 110 toward the outer direction of the rear casing 23, and the truncated portion of the outer truncated cone portion 106 is an outer cylinder. It continues to the part 108. The bus bar length of the outer cylindrical portion 108 is an insulation distance between the holding plate 110, that is, the rear casing 23 and the lead wire 90. This insulation distance is also set to about 15 mm.

As shown in the figure, the sealing member 100 penetrates the inner cylindrical portion 102, the inner truncated cone portion 104, the outer truncated cone portion 106, and the outer cylindrical portion 108 in the longitudinal direction. A lead wire introduction hole 101 having the same diameter is formed, and the lead wire 90 is partially surrounded by the sealing member 100 having the lead wire introduction hole 101.
That is, the lead wire 90 is connected to the input terminal 92 of the electric motor 40 in the motor chamber 26, and the intermediate portion 94 connected to the input portion 92, surrounded by the sealing member 100 and penetrating the rear casing 23. And an output unit 96 connected to the output terminal of the drive circuit 98.

  The sealing member 100 surrounding the lead wire 90 is aligned with the casing through-hole 23h in which the inner truncated cone portion 104 is expanded toward the outside of the rear casing 23, and then the outer truncated cone portion 106. When the rear casing 23 and the holding plate 110 are fixed from the outside with the bolts 112 and 112 while being aligned with the holding plate through-hole 110h having a diameter reduced toward the outside of the rear casing 23, the axial force depends on the axial force. The inner truncated cone portion 104 and the outer truncated cone portion 106 are plastically deformed. More specifically, drag is generated in the normal direction of the contact surface between the inner truncated cone portion 104 and the casing through hole 23h and the contact surface between the outer truncated cone portion 106 and the pressing plate through hole 110h, The outer peripheral side of the inner truncated cone portion 104 is fitted into the rear casing 23, and the outer peripheral side of the outer truncated cone portion 106 is fitted into the holding plate 110 in an airtight manner, and the rear casing 23, the holding plate 110, the sealing member 100, and the like. Is sealed. Simultaneously with this sealing, the inner peripheral sides of the inner truncated cone portion 104 and the outer truncated cone portion 106 are brought into close contact with the intermediate portion 94 of the lead wire 90 due to the above deformation, and the sealing member 100 and the lead wire 90 are sealed. Is done.

  In the compressor 4, when the electric motor 40 is driven by the electric power supplied from the drive circuit 98 and the rotary shaft 30 rotates, the movable scroll 54 rotates around the axis of the fixed scroll 56 via the eccentric bush 66. At this time, the rotation of the movable scroll 54 is in a state of being blocked by the action of the plurality of rotation blocking mechanisms 50. As a result, the orbiting scroll 54 orbits with respect to the fixed scroll 56 while maintaining its orbiting posture constant, and this orbiting movement sucks the refrigerant from the motor chamber 26 into the compression chamber 58 through the suction port 25 and sucks the refrigerant. The refrigerant is compressed, and the compressed refrigerant is discharged into the discharge chamber 80.

  The refrigerant in the high-temperature and high-pressure gas state discharged from the discharge chamber 80 is cooled in the gas cooler through the discharge port 87, supplied to the expansion valve, blown into the evaporator after being expanded by the throttling action, and the heat of vaporization of the refrigerant This cools the air around the evaporator. Next, the cool air is sent into the passenger compartment to cool the passenger compartment. The refrigerant in the evaporator returns to the suction port 25 of the compressor 4, and is then compressed again by the compressor 4 and circulated as described above.

  As described above, in the lead wire 90 of the compressor 4 of the first embodiment, the intermediate portion 94 is surrounded by the sealing member 100 and penetrates the rear casing 23, and the input portion 92 is connected to the electric motor 40. The output portion 96 is connected to an external drive circuit 98, and the lead wire 90 in the motor chamber 26 is pulled out to the outside of the rear casing 23 as it is. Accordingly, the conventional sealed terminal device is not required, and specifically, the connecting portion between the lead wire and the sealed terminal can be omitted. This leads to a reduction in locations where current can leak, and the insulation performance is greatly improved.

Further, the omission of the connecting portion between the lead wire and the sealing terminal eliminates the need for the resin filling operation into the housing as in the prior art, and the production efficiency of the compressor 4 is improved. Reuse of the components of the compressor 4 such as the casing 22 and the rear casing 23 is facilitated.
Further, the lead wire 90 surrounded by the sealing member 100 and penetrating the rear casing 23 is surrounded by the inner cylindrical portion 102 and the outer cylindrical portion 108 on the inner side and the outer side of the rear casing 23, and these inner cylindrical portion 102 and outer cylindrical portion are also surrounded. The bus length of the portion 108 is the insulation distance. For this reason, the rear casing 23 and the lead wire 90 are reliably insulated, and the insulation performance is greatly improved. Further, as a result of eliminating the need for the conventional sealed terminal device, the assembly of the lead wire 90 to the rear casing 23 is also improved.

  Further, in the sealing member 100 surrounding the lead wire 90, when the holding plate 110 is pressed by the bolts 112, 112 from the outside of the rear casing 23, the inner truncated cone portion 104 and the outer truncated cone portion 106 are plastically deformed. In addition to the seal at two locations, that is, the seal between the lead wire 90 and the sealing member 100, the seal between the sealing member 100 and the rear casing 23 is simultaneously achieved by the action of the wedge. Therefore, even if the pressure in the housing 20 increases due to the operation of the compressor 4, the surface pressure of the contact portion between the lead wire 90 and the sealing member 100 and the contact portion between the sealing member 100 and the rear casing 23 is increased. As a result, the sealing performance is improved and leakage of the refrigerant from the housing 20 is reliably prevented. Further, according to the sealing method of the present embodiment, the number of parts related to sealing is reduced as compared with the conventional method, and the sealing process is simplified, and the manufacturing cost of the compressor 4 can be reduced.

The present invention is not limited to the first embodiment described above, and various modifications are possible. The electric compressors of the second to fourth embodiments will be described below with reference to FIGS. 4 to 7. In the description of the second to fourth embodiments, the same members and portions as those of the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.
The electric compressor of the second embodiment is shown in FIG. 4 and FIG. 5, and the sealing member 100A is formed to have one truncated cone portion. Specifically, the sealing member 100A includes an inner cylindrical portion 102A that extends from the bottomed portion of the rear casing 23 into the motor chamber 26, and the bus bar length of the inner cylindrical portion 102A is the same as that of the rear casing 23. The insulation distance from the lead wire 90 is set. A bobbin receiving portion (receiving portion) 116 that is fitted from the outside to the bobbin that covers the armature winding 43 is formed at the end of the inner cylindrical portion 102A. Specifically, as shown in FIG. 5, the bobbin receiving portion 116 has an engaging claw 118 extending toward the inner peripheral side, and this engaging claw 118 is engaged with a not-shown bobbin recess, and the inner cylindrical portion 102 A is fixed to the stator 44.

  On the other hand, the sealing member 100A includes a truncated conical cylinder portion 104A whose diameter is reduced toward the outside of the rear casing 23, and a portion opposite to the truncated portion of the truncated conical cylinder portion 104A is connected to the inner cylindrical portion 102A. ing. The truncated conical cylinder portion 104A is formed to be slightly larger than the casing through hole 23Ah of the rear casing 23. The sealing member 100 </ b> A includes an outer cylindrical portion 108 </ b> A that is continuous with the truncated portion of the truncated conical cylinder portion 104 </ b> A and extends outward from the rear casing 23. The bus bar length of the outer cylindrical portion 108 </ b> A is an insulation distance between the rear casing 23 and the lead wire 90. As shown in FIG. 4, a male screw portion that is screwed into the nut 114 is formed on the outer peripheral side of the outer cylindrical portion 108 </ b> A.

  Also in the present embodiment, the sealing member 100A surrounding the lead wire 90 has the nut 114 attached to the male thread portion of the outer cylindrical portion 108A with the truncated conical cylinder portion 104A aligned with the casing through hole 23Ah. When the screw is engaged from the outside, the truncated conical cylinder portion 104A and the outer cylindrical portion 108A are plastically deformed according to the axial force, and the outer peripheral side of the truncated cone tube portion 104A and the outer cylindrical portion 108A is the rear casing 23. And the rear casing 23 and the sealing member 100A are sealed. Simultaneously with this sealing, the inner peripheral sides of the truncated conical cylinder portion 104A and the outer cylindrical portion 108A are brought into close contact with the intermediate portion 94 of the lead wire 90 by the above deformation, and the sealing member 100A and the lead wire 90 are sealed.

  As described above, according to the second embodiment, the truncated conical cylinder portion 104A and the outer cylindrical portion 108A are airtightly fitted to the rear casing 23 by the action of the wedge. Therefore, as in the first embodiment, two seals are achieved, and the insulation performance is greatly improved by the configuration of the inner cylindrical portion 102A and the outer cylindrical portion 108A. In addition, in the second embodiment, no pressing plate is required, and the manufacturing cost can be further reduced. In addition, the configuration of the inner cylindrical portion 102A described above facilitates positioning of the sealing member 100A. The sealing member 100A and the bobbin may be integrally formed.

Next, the electric compressor of the third embodiment is shown in FIG.
The sealing member 100B focuses on the two seals described above, and is sandwiched between the rear casing 23 and the pressing plate 110B. The sealing member 100B includes a stepped cylindrical portion 104B that is airtightly fitted to the rear casing 23, a small-diameter portion thereof is fitted into the casing through hole 23Bh, and a rear surface side of the large-diameter portion is the rear casing 23. It is in contact with the outside. The small diameter portion is formed slightly larger than the casing through hole 23Bh. Further, the sealing member 100B includes a truncated conical cylinder portion 106B that is reduced in diameter toward the outside of the rear casing 23, and a portion opposite to the truncated portion of the truncated cone cylinder portion 104B is the large diameter portion. It is lined up. This large diameter portion is configured to be larger than the presser plate through hole 110Bh.

  The lead wire 90 of the present embodiment is composed of two phases, and the sealing member 100B surrounding the lead wire 90 has the cylindrical portion 104B aligned with the casing through hole 23Bh, and then the truncated cone. When the rear casing 23 and the pressing plate 110B are fixed from the outside with the bolts 112B and 112B in a state where the cylindrical portion 106B is aligned with the pressing plate through-hole 110Bh, the cylindrical portion 104B and the truncated conical cylinder according to the axial force thereof. The portion 106B is plastically deformed, and the outer peripheral sides of the cylindrical portion 104B and the truncated conical cylinder portion 106B are fitted into the rear casing 23 and the holding plate 110B, respectively, so that the rear casing 23 and the sealing member 100B are sealed. At the same time, the inner peripheral sides of the cylindrical portion 104B and the truncated conical cylindrical portion 106B are brought into close contact with the intermediate portion 94 of the lead wire 90 due to the above deformation, and the sealing member 100B and the lead wire 90 are sealed.

Subsequently, the electric compressor of the fourth embodiment is shown in FIG.
This sealing member 100C also pays attention to the two seals described above. The sealing member 100C is sandwiched between the rear casing 23 and the pressing plate 110C, whereas the pressing plate 110C is reduced in diameter toward the outside of the rear casing 23. Specifically, as shown in FIG. 7A, the holding plate 110C has a fixing portion 120 that is in contact with the rear casing 23 via a bolt 112C on the outer peripheral side thereof. A tapered portion 122 that is airtightly fitted to the sealing member 100 </ b> C is provided on the inner peripheral side of 120. The space formed by the inside of the tapered portion 122 is configured to be smaller than the sealing member 100C.

  The lead wire 90 of the present embodiment is composed of three phases, and the sealing member 100C surrounding the lead wire 90 is disposed outside the rear casing 23. Further, from the outside, the pressing plate 110C connects the sealing member 100C. When the rear casing 23 and the holding plate 110C are fixed with bolts 112C and 112C from the outside in the covered state, the taper portion 122 points the sealing member 100C inward according to the axial force as shown in FIG. Press to cause plastic deformation. Thereby, the outer peripheral side of the sealing member 100C is fitted into the rear casing 23 and the pressing plate 110C in an airtight manner, and the rear casing 23 and the sealing member 100C are sealed. At the same time, the inner peripheral side of the sealing member 100C is brought into close contact with the intermediate portion 94 of the lead wire 90 by the above deformation, and the sealing member 100C and the lead wire 90 are sealed. As a result, two seals are achieved using the existing rear casing, and a reduction in manufacturing cost can be achieved. In addition, this sealing member 100C may be divided into two on both sides of the lead wire 90, in other words, the front side and the back side of the drawing with the lead wire 90 interposed therebetween. In this case, the shaft by the bolt 112C When the sealing member 100C is deformed by the force in the direction, there is an effect that the position of the sealing member 100C is not easily displaced with respect to the rear casing 23.

The description of one embodiment of the present invention is finished above, but the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.
For example, the electric motor 40 of the above embodiment is a three-phase motor, but is not necessarily limited to this form, and can be applied to, for example, a single-phase or a two-phase motor. 90 and the sealing member 100 (100A, 100B, 100C) are provided. Also in this case, the sealing device can be miniaturized, which contributes to the miniaturization of the compressor 4. Depending on the magnitude of the motor voltage, in the first and second embodiments, two or more lead wires for each phase may be used as in the third and fourth embodiments.

Although the scroll type electric compressor is described in the above embodiment, the compression unit of the present invention can be applied to either a scroll type or a piston reciprocating type, and further used for a refrigeration circuit. As the refrigerant to be used, an alternative chlorofluorocarbon may be used in addition to the CO ₂ refrigerant. Also in these cases, as described above, a significant improvement in insulation performance is achieved, and simple and reliable sealing is possible.

1 is a longitudinal sectional view showing a scroll compressor according to a first embodiment of the present invention. It is a partial expanded longitudinal cross-sectional view in the compressor of FIG. It is a perspective view of the sealing member of FIG. It is a partial expanded longitudinal cross-sectional view in the compressor of 2nd Example. It is sectional drawing of the sealing member of FIG. It is a partial expanded longitudinal cross-sectional view in the compressor of 3rd Example. It is a partial expanded longitudinal cross-sectional view in the compressor of 4th Example.

Explanation of symbols

4 Electric Compressor 20 Housing 22 Drive Casing 23 Rear Casing (Drive Casing)
24 Compression casing 26 Motor room (machine room)
30 Rotating shaft 40 Electric motor 42 Rotor 43 Armature winding 44 Stator 52 Scroll unit (compression unit)
90 Lead wire 92 Input section 94 Intermediate section 96 Output section 98 Drive circuit 100, 100A, 100B, 100C Sealing member 102, 102A Inner cylindrical section 104 Inner truncated cone cylinder section 104A Trimmed cone cylinder section 104B Cylindrical section 106 Outer trimming section Cone cylinder part 106B Cone cone part 108, 108A Outer cylinder part 110, 110B, 110C Holding plate 112, 112B, 112C Bolt 114 Nut 116 Bobbin receiving part (receiving part)
120 Fixed part 122 Tapered part

Claims (8)

A housing having a drive casing and a compression casing that is airtightly fitted to the drive casing;
A machine room including a motor that is formed in the drive casing and that is rotatably supported to drive a rotating shaft;
A compression unit housed in the compression casing and driven by the rotating shaft to perform a series of processes of refrigerant suction, compression and discharge;
A sealing member disposed in the drive casing and surrounding a lead wire for supplying electric power to the motor from a drive circuit outside the drive casing;
The lead wire is
An input connected to the motor;
An intermediate portion that is connected to the input portion and is surrounded by the sealing member and penetrates the drive casing;
An electric compressor including an output portion connected to the drive circuit and connected to the intermediate portion. The sealing member extends from the inner end surface of the drive casing into the drive casing, and has an inner cylindrical portion having a bus bar length as an insulation distance, and from the outer end surface of the drive casing toward the outside of the drive casing. The electric compressor according to claim 1, further comprising an outer cylindrical portion that is extended and has a bus bar length as an insulation distance. Further comprising a pressing plate that is in contact with the drive casing from the outside and presses the sealing member by the axial force of the bolt;
The sealing member is hermetically fitted to the drive casing, and is connected to the inner truncated cone cylinder portion that is expanded toward the outside of the drive casing; and the inner truncated cone cylinder portion, and is airtight to the holding plate. 3. The electric compressor according to claim 1, further comprising an outer truncated conical cylinder portion that is fitted to the outer casing and is reduced in diameter toward the outside of the drive casing. The sealing member extends from the inner end surface of the drive casing into the drive casing, and is fitted into the drive casing in an airtight manner with an inner cylindrical portion having a bus bar length as an insulation distance. A truncated conical cylinder portion that is reduced in diameter toward the head, and the continuous truncated cone portion that extends from the outer end surface of the drive casing toward the outside of the drive casing. 2. The electric compressor according to claim 1, comprising: an outer cylindrical portion having a male screw portion on an outer periphery thereof; and a nut screwed into the male screw portion and brought into contact with the drive casing from the outside. . The motor is disposed around the rotating shaft and has a rotor having a permanent magnet that is rotated integrally with the rotating shaft, and an armature winding that is disposed around the rotor and rotates the rotor by rotating a magnetic field. A stator having
The electric compressor according to claim 4, wherein the inner cylindrical portion has a receiving portion fitted to the stator from the outside. Further comprising a pressing plate that is in contact with the drive casing from the outside and presses the sealing member by the axial force of the bolt;
The sealing member includes a cylindrical portion that is hermetically fitted to the drive casing, and a truncated cone that is continuous with the cylindrical portion and is hermetically fitted to the pressing plate and is reduced in diameter toward the outside of the drive casing. The electric compressor according to claim 1, further comprising a cylindrical portion. Further comprising a pressing plate that is in contact with the drive casing from the outside and presses the sealing member by the axial force of the bolt;
The presser plate is connected to the driving casing via the bolt, and is connected to the inner peripheral side of the fixing section, and is hermetically fitted to the sealing member, and is directed to the outside of the driving casing. The electric compressor according to claim 1, further comprising a tapered portion that is reduced in diameter.   The electric compressor according to any one of claims 1 to 7, wherein the lead wire includes one or a plurality of lead wires for each phase of the motor.

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