JP7444107B2 - electric compressor - Google Patents

Description

The present invention relates to an electric compressor.

An electric compressor generally includes a compression mechanism that compresses refrigerant, a motor mechanism that drives the compression mechanism, a metal housing that includes a motor housing chamber that houses the motor mechanism, and an inverter circuit that drives the motor mechanism. It is equipped with The motor mechanism includes a cylindrical stator core fixed to a housing, a coil end protruding from an end surface of the stator core, a lead wire drawn out from the coil end, and a connector that electrically connects the lead wire and the inverter circuit. have. The coil end is formed by winding a conductive wire having an insulating coating around the stator core. The connector has a terminal electrically connected to the tip of a lead wire, and a connector housing made of an insulating material. The connector housing is formed with a terminal accommodating chamber for accommodating a terminal and an insertion opening into which a lead wire is inserted.

In such an electric compressor, when the operation is stopped, the refrigerant gas remaining in the housing may be cooled and liquefied, and the liquid refrigerant may remain in the motor housing chamber of the housing. In this case, if the liquid refrigerant enters the connector housing from the insertion port, electrical conduction will occur between the conductive parts such as lead wires and terminals inside the connector housing and the motor housing chamber through the liquid refrigerant, and the inside of the connector housing will become electrically conductive. It becomes impossible to insulate between the conductive part and the motor housing chamber. If the electric compressor starts operating in this state, there is a risk that the current supplied to the conductive portion within the connector housing may leak into the motor housing chamber via the liquid refrigerant.

Here, in order to avoid contact of the liquid refrigerant with the conductive part in the connector housing, it is effective to seal the insertion port with rubber or resin to seal the connector housing. However, in this case, if the air within the connector housing thermally expands due to the temperature rise within the connector housing, the pressure within the connector housing may increase excessively, and the connector housing may not be able to withstand the high pressure.

Therefore, Patent Document 1 discloses an electric compressor in which the insulation resistance between a motor housing chamber and a conductive part within the connector housing is increased without sealing the connector housing. In this electric compressor, a lead wire electrically connected to a terminal is covered with a cylindrical member made of an insulating tube. This cylindrical member has one end extending in a cylindrical shape toward the stator core and covering the lead wire while forming a gap between the two ends, and the other end is joined to the insertion opening of the connector housing without a gap. . In this way, by communicating the inside and outside of the connector housing through the gap in the cylindrical member, the liquid refrigerant is prevented from entering the connector housing from other than the gap in the cylindrical member. As a result, the leakage path between the conductive part in the connector housing and the motor housing chamber can be lengthened by the length of the cylindrical member, and the insulation resistance between the conductive part in the connector housing and the motor housing chamber can be increased. becomes possible.

JP2011-58388A

Incidentally, the lead wire is made of a conducting wire having a conductive core material covered with an insulating coating. If such a lead wire has minute scratches, the liquid refrigerant that has entered the cylindrical member will come into contact with the conductive core material at the site of the minute scratches. In this case, the electrical conductivity between the conductive core material in the area where there is a minute scratch and the motor housing chamber will be electrically connected via the liquid refrigerant, so compared to the case where there is no minute scratch, the area with the minute scratch and the connector housing will be electrically connected to each other through the liquid refrigerant. The leakage path will be shortened by the distance to the conductive portion inside, and there is a risk that the insulation effect due to the lengthening of the leakage path by the cylindrical member will be insufficient.

In particular, in electric compressors that use refrigerating machine oil that easily conducts electricity, measures are required to prevent electrical leakage through minute scratches in the lead wires.

Here, it is effective to increase the thickness of the insulating coating of the conducting wire constituting the lead wire in order to prevent electric leakage through minute scratches on the lead wire. However, if the lead wire becomes too thick due to the thickening of the insulating coating, it becomes difficult to insert the lead wire into the cylindrical member, resulting in a decrease in productivity. Furthermore, there are limits to the thickness of the insulating coating due to size restrictions on the terminals that are joined to the lead wires by caulking or the like and the connector housings that accommodate the terminals, as well as the difficulty of coating the insulating coatings. For this reason, it is not very effective to take measures against electrical leakage against minute scratches in the lead wire by increasing the thickness of the insulating coating.

The present invention has been made in view of the above-mentioned conventional circumstances, and provides an electric compressor that covers the lead wires with a cylindrical member to prevent an excessive pressure rise in the connector housing, while preventing the lead wires inside the cylindrical member from increasing. The issue to be solved is to implement effective leakage countermeasures against even the smallest scratches in wires.

The electric compressor of the present invention includes:
a compression mechanism that compresses refrigerant;
a motor mechanism that drives the compression mechanism;
a metal housing having a motor accommodation chamber therein for accommodating the motor mechanism;
an inverter circuit that drives the motor mechanism;
The motor mechanism is
a cylindrical stator core fixed to the housing;
a coil end formed by winding a conductive wire having an insulating coating around the stator core and protruding from an end surface of the stator core;
a lead wire made of the conductive wire pulled out from the coil end;
a connector that electrically connects the lead wire and the inverter circuit,
The connector is
a terminal electrically connected to the tip of the lead wire;
An electric compressor comprising a terminal accommodating chamber for accommodating the terminal and a connector housing made of an insulating material and having an insertion opening into which the lead wire is inserted,
The motor mechanism includes a first insulating member that is cylindrical and into which the lead wire is inserted, and a second insulating member into which the first insulating member is inserted with a gap,
The first insulating member is sealed at one end with the lead wire with an insulating resin,
The second insulating member is inserted into the insertion port and covers the other end of the first insulating member,
A space between the second insulating member and the insertion port is sealed,
The resin covers the lead wire and the coil end extending from the first insulating member,
The electric compressor is characterized in that the terminal housing chamber and the motor housing chamber communicate with each other via the gap.

In the electric compressor according to the above invention, the cylindrical member that covers the lead wire is further covered with another cylindrical member. According to such a structure in which the cylindrical member has a double structure inside and outside, if the lead wire in the first insulating member has a minute scratch, the wire from the minute scratch to the opening at one end of the second insulating member The length of the leakage path through the liquid refrigerant is determined by the distance from the micro scratch to the opening at the other end of the first insulating member, and the distance from the opening at the other end of the first insulating member to the opening at one end of the second insulating member. Total length. Therefore, even if there is a minute scratch on the lead wire inside the first insulating member, the length of the leakage path from the minute scratch to the opening at one end of the second insulating member can be effectively ensured. I can do it. Therefore, it is possible to take effective measures against electric leakage even against minute scratches on the lead wires within the first insulating member.

On the other hand, in this electric compressor, since the inside of the connector housing communicates with the motor housing chamber through the gap between the first insulating member and the second insulating member, the air inside the connector housing is transferred between the first insulating member and the second insulating member. It can escape into the motor housing chamber through the gap with the member. Therefore, even if the inside of the connector housing becomes high temperature, the pressure inside the connector housing does not rise excessively.

Therefore, according to this electric compressor, by covering the lead wire with the cylindrical member, an excessive pressure rise inside the connector housing is prevented, and at the same time, an effective leakage countermeasure against minute scratches on the lead wire inside the cylindrical member is provided. It becomes possible to apply.

In the electric compressor, the second insulating member and the connector housing may be integrally formed. In this electric compressor, since the second insulating member is integrated with the connector housing, the number of parts and the number of assembly steps are reduced.

In the electric compressor described above, it is preferable that a gap between the first insulating member and the second insulating member is smaller than a gap between the lead wire and the first insulating member. When the gap between the first insulating member and the second insulating member is smaller than the gap between the lead wire and the first insulating member, the leakage path in the former is narrower than the leakage path in the latter. When it comes to earth leakage countermeasures, it is advantageous to have a narrower earth leakage path. Here, the length L of the leakage path from the minute scratch on the lead wire in the first insulating member to the opening at one end of the second insulating member is the length L from the minute scratch to the opening at the other end of the first insulating member. This is the sum of the length L1 of the gap and the length L2 of the gap from the opening at the other end of the first insulating member to the opening at one end of the second insulating member. The length L1 can be short or long depending on the position of the minute scratches on the lead wire. On the other hand, the length L2 is equal to the overlapping length of the first insulating member and the second insulating member. Therefore, by setting this overlapping length to a predetermined value or more, the length L2 of the gap between the first insulating member and the second insulating member, which has a narrow earth leakage path that is effective as a measure against electric leakage, can be made to be a predetermined value or more. 1. Regardless of the position of minute scratches on the lead wire in the insulating member, the above-mentioned earth leakage prevention effect can be exerted to a greater extent than a predetermined value.

According to the electric compressor of the present invention, by covering the lead wire with the cylindrical member, an excessive rise in pressure inside the connector housing is prevented, and at the same time, an effective measure against electric leakage is provided against minute scratches on the lead wire inside the cylindrical member. It becomes possible to apply.

FIG. 1 is a longitudinal cross-sectional view of the electric compressor of Example 1. FIG. 2 is a sectional view schematically showing the relationship among a coil end, a lead wire, a cylindrical member, and a connector in the electric compressor of Example 1. FIG. 3 is a sectional view schematically showing the relationship between the length of the inner cylinder member and the length of the outer cylinder member in the electric compressor of Example 1. FIG. 4 is a cross-sectional view schematically showing the relationship among a coil end, a lead wire, a cylindrical member, and a connector in the electric compressor of Example 2. FIG. 5 is a cross-sectional view schematically showing the relationship among a coil end, a lead wire, a cylindrical member, and a connector in the electric compressor of Example 3. FIG. 6 is a sectional view schematically showing the relationship among a coil end, a lead wire, a cylindrical member, and a connector in the electric compressor of Reference Example 1. FIG. 7 is a sectional view schematically showing the relationship among a coil end, a lead wire, a cylindrical member, and a connector in an electric compressor of Reference Example 2. FIG. 8 is a sectional view schematically showing the relationship among a coil end, a lead wire, a cylindrical member, and a connector in an electric compressor of Reference Example 3.

Embodiments 1 to 3 embodying the present invention will be described below with reference to the drawings.

(Example 1)
As shown in FIG. 1, the electric compressor of Example 1 includes a compression mechanism 10 that compresses refrigerant, a motor mechanism 12 that drives the compression mechanism 10, a housing 14, and an inverter circuit 16 that drives the motor mechanism 12. It is equipped with The housing 14 is made of metal, for example, an aluminum alloy. The housing 14 includes a front housing 1 and a motor housing 3. The compression mechanism 10 and the motor mechanism 12 are housed within the motor housing 3.

In the following explanation, the arrow Y1 direction shown in FIG. 1 is defined as the front-rear direction, and the front housing 1 side located on the left side of the paper in FIG. 1 is defined as the front side of the electric compressor, and the opposite right side on the paper of FIG. Defined as the rear side. Note that the front-rear direction in the embodiment is an example. The longitudinal direction of the electric compressor is changed as appropriate depending on the vehicle in which it is mounted. Moreover, in this specification, the radial direction and the axial direction mean the radial direction and axial direction of the cylindrical member, which will be described later.

The motor housing 3 has a bottomed cylindrical shape with an opening on the front side, and has a motor peripheral wall 31 that extends in a cylindrical shape from front to back, and a motor bottom wall 33 that has a disc shape at the rear end of the motor peripheral wall 31. There is. A front housing 1 is fixed to the front end of the motor housing 3, and the front opening of the motor housing 3 is closed by the front housing 1. A shaft support member 5 fixed to a motor peripheral wall 31 is accommodated within the motor housing 3 . Further, a fixed scroll 7 fixed to the motor peripheral wall 31 in front of the shaft support member 5 is housed in the motor housing 3 . A discharge chamber 10a of the compression mechanism 10 is defined between the front housing 1 and the fixed scroll 7. A discharge port 10b is formed in the front end wall of the front housing 1 and extends through the front end wall. The motor peripheral wall 31 is formed with an inlet port 10c that penetrates the motor peripheral wall 31. The suction port 10c and the discharge port 10b are connected to an external refrigerant circuit (not shown).

A movable scroll 9 disposed opposite the fixed scroll 7 in the front-rear direction is housed within the motor housing 3 . By meshing the fixed scroll 7 and the movable scroll 9, a compression chamber 10d of the compression mechanism 10 is defined between them. The compression chamber 10d communicates with the motor housing chamber 3a via a suction passage 5a formed in the shaft support member 5. Further, the compression chamber 10d communicates with the discharge chamber 10a via a discharge passage 7a formed in the fixed scroll 7. A rotating shaft 21 rotatably supported by a shaft supporting member 5 and a motor bottom wall 33 is housed within the motor housing 3 . The movable scroll 9 is connected to the front end of the rotating shaft 21 via a bush 23 and the like.

Inside the motor housing 3, a motor housing chamber 3a is defined behind the shaft support member 5. The motor housing chamber 3a also serves as a suction chamber for the compression mechanism 10. The motor mechanism 12 is housed in the motor housing chamber 3a.

The motor mechanism 12 includes a cylindrical stator core 41, a cylindrical rotor 43, and a coil end 45. Stator core 41 is fixed to motor peripheral wall 31. The rotor 43 is fixed to the rotating shaft 21 and arranged inside the stator core 41. The coil end 45 is formed by winding a conductive wire around the stator core 41 and protrudes from the end surface of the stator core 41. The conductive wire is composed of a conductive core material and an insulating coating covering the conductive core material.

As shown in FIG. 2, the motor mechanism 12 includes a plurality of (three in this embodiment) motor-side lead wires 47 made of conducting wires and a connector 50. Each motor-side lead wire 47 is drawn out from the coil ends 45 of the U-phase coil, V-phase coil, and W-phase coil of the motor mechanism 12, respectively. In FIG. 2, for convenience of explanation, the motor-side lead wires 47 are shown extending straight from the coil end 45, but in reality, each motor-side lead wire 47 extends along the rear end surface of the stator core 41. It extends in the circumferential direction.

The connector 50 electrically connects each motor side lead wire 47 and the inverter circuit 16. The connector 50 has a connector housing 51 made of resin as an insulating material. The connector housing 51 includes a box-shaped main body 53 with one side open and a lid 55 that closes the opening of the main body 53. The main body portion 53 and the lid portion 55 are hermetically joined with a resin (not shown), and a plurality of terminal accommodating chambers 51a are formed within the connector housing 51. A terminal 57 is housed in each terminal housing chamber 51a. A plurality of insertion openings 51b are formed in the lid portion 55, through which the respective motor-side lead wires 47 are inserted. The tip of each motor-side lead wire 47 is electrically connected to a terminal 57 through an insertion port 51b. A rod-shaped conductive portion 59 is electrically connected to each terminal 57, respectively. Each rod-shaped conductive portion 59 extends to the outside of the connector housing 51 through an insertion opening (not shown) formed in the main body portion 53, respectively. The insertion opening through which the rod-shaped conductive portion 59 is inserted is sealed with an insulator (not shown). Each rod-shaped conductive portion 59 is electrically connected to the inverter circuit 16 by an inverter-side lead wire 17.

As shown in FIG. 1, a box-shaped inverter cover 18 with an open front is fixed to the rear surface of the motor bottom wall 33. As shown in FIG. The inverter cover 18 is made of metal, for example, an aluminum alloy. An inverter housing chamber 18a is defined between the motor bottom wall 33 and the inverter cover 18. The inverter circuit 16 is attached to the rear surface of the motor bottom wall 33 and is housed in the inverter housing chamber 18a. The inverter circuit 16 includes electrical components (not shown), such as a circuit board, switching elements, and coils. The inverter circuit 16 is connected to an external power source through an insertion hole (not shown) formed in the inverter cover 18.

A communication port 33a is formed in the motor bottom wall 33 to communicate the motor housing chamber 3a and the inverter housing chamber 18a. A plurality of rod-shaped conductive portions 59 are held in the communication port 33a via an insulator 35, and are inserted through the communication port 33a.

As shown in FIG. 2, the motor mechanism 12 includes a plurality of cylindrical members 60 that cover each motor side lead wire 47, respectively. Each cylindrical member 60 is made of an insulating material and has an inner cylindrical member 61 made of an insulating tube and an outer cylindrical member 63 made of an insulating tube. The inner cylindrical member 61 corresponds to the first insulating member in the present invention, and the outer cylindrical member 63 corresponds to the second insulating member in the present invention. Each inner cylindrical member 61 covers the motor-side lead wire 47 while forming a first gap 61c therebetween. Each outer cylinder member 63 covers the inner cylinder member 61 while forming a second gap 63c therebetween.

In FIG. 2, for convenience of explanation, the inner cylinder member 61 and the outer cylinder member 63 are shown as extending straight, but in reality, the inner cylinder member 61 and the outer cylinder member 63 are connected to the motor side lead wire 47. Similarly, it extends in the circumferential direction along the rear end surface of the stator core 41. Further, as shown in FIG. 3, the size G2 of the second gap 63c is smaller than the size G1 of the first gap 61c. The value of G1 is defined by the radial length between the outer peripheral surface of the motor side lead wire 47 and the inner peripheral surface of the inner cylinder member 61. The value of G2 is defined by the radial length between the outer peripheral surface of the inner cylinder member 61 and the inner peripheral surface of the outer cylinder member 63.

The opening 61a at one end of each inner cylinder member 61 is closed with an insulating resin 49, respectively. That is, the resin 49 enters into the opening 61a and closes the opening 61a, and also integrally covers the periphery of the lead wire 47 and the coil end 45 extending from the opening 61a. Thereby, one end of the inner cylinder member 61 and the coil end 45 are airtightly joined via the resin 49. On the other hand, the other end of each inner cylindrical member 61 extends to the vicinity of the insertion port 51b, that is, to the vicinity of the end surface 51c of the connector housing 51, and the opening 61b at the other end is open within the outer cylindrical member 63. Thereby, the opening 61b communicates the inside of the inner cylinder member 61 and the inside of the outer cylinder member 63.

One end of each outer cylinder member 63 extends to the vicinity of the coil end 45, and an opening 63a at one end is open within the motor housing chamber 3a. Thereby, the opening 63a communicates the inside of the outer cylinder member 63 with the motor housing chamber 3a. On the other hand, the other end of each outer cylinder member 63 extends into the terminal accommodating chamber 51a, and the opening 63b at the other end is open within the terminal accommodating chamber 51a. Thereby, the opening 63b communicates the inside of the outer cylinder member 63 with the terminal accommodating chamber 51a. The outer peripheral surface near the other end of the outer cylinder member 63 is joined to the insertion port 51b without a gap through a resin (not shown). Further, the other end of the outer cylinder member 63 is caulked to the terminal 57, and the outer circumferential surface of the other end is joined to the terminal 57 without a gap through a resin (not shown).

As shown in FIG. 3, within the motor housing 3, the length Ld in which the inner cylinder member 61 and the outer cylinder member 63 overlap is longer than the length Li of only the inner cylinder member 61, and It is longer than the length Lo of the member 63 alone. The overlapping length Ld is defined by the axial length between the opening 61b at the other end of the inner cylinder member 61 and the opening 63a at one end of the outer cylinder member 63. The length Li of only the inner cylinder member 61 is defined by the axial length between the opening 61a at one end of the inner cylinder member and the opening 63a at one end of the outer cylinder member 63. The length Lo of only the outer cylinder member 63 is defined by the axial length between the opening 61b at the other end of the inner cylinder member and the end surface 51c of the connector housing 51.

In the electric compressor configured as described above, when power is supplied to the stator core 41 from an external power source, the rotating shaft 21 rotates together with the rotor 43. When the rotating shaft 21 rotates, the movable scroll 9 connected to the rotating shaft 21 revolves, and the volume of the compression chamber 10d between the movable scroll 9 and the fixed scroll 7 decreases. The refrigerant of the external refrigerant circuit is sucked into the motor housing 3a through the suction port 10c. The refrigerant sucked into the motor housing 3a is sucked into the compression chamber 10d via the suction passage 5a, and is compressed in the compression chamber 10d. The refrigerant compressed within the compression chamber 10d is discharged from the discharge passage 7a to the discharge chamber 10a. The refrigerant in the discharge chamber 10a flows out to the external refrigerant circuit via the discharge port 10b. The refrigerant that has flowed out into the external refrigerant circuit passes through the heat exchanger and expansion valve of the external refrigerant circuit, and then flows back into the motor housing 3a through the suction port 10c. The electric compressor and the external refrigerant circuit constitute a vehicle air conditioner.

In this electric compressor, the motor side lead wire 47 is covered with an inner cylinder member 61, and the inner cylinder member 61 is further covered with an outer cylinder member 63. The opening 61a at one end of the inner cylinder member 61 is closed by the coil end 45, while the opening 61b at the other end of the inner cylinder member 61 is opened inside the outer cylinder member 63, so that the inside of the inner cylinder member 61 and the outer cylinder member 63 are opened. It communicates with the inside of. Further, an opening 63a at one end of the outer cylinder member 63 is opened in the motor housing chamber 3a to communicate the inside of the outer cylinder member 63 and the motor housing chamber 3a, while an opening 63b at the other end of the outer cylinder member 63 is opened within the motor housing chamber 3a. It is opened in the housing chamber 51a to communicate the inside of the outer cylinder member 63 and the terminal housing chamber 51a.

According to such a structure in which the cylindrical member 60 has the above-mentioned double structure, effective leakage countermeasures can be taken against the minute scratches MS of the motor side lead wire 47 inside the inner cylindrical member 61. That is, as shown in FIG. 3, when the motor side lead wire 47 inside the inner cylinder member 61 has a minute scratch MS, the liquid refrigerant from the minute scratch MS to the opening 63a at one end of the outer cylinder member 63 The length L of the leakage path through the micro-scratches MS is the distance L1 from the minute scratch MS to the opening 61b at the other end of the inner cylinder member 61, and the distance L1 from the opening 61b at the other end of the inner cylinder member 61 to the opening 63a at one end of the outer cylinder member 63. This is the total length including the distance L2 up to. Therefore, even if the motor side lead wire 47 inside the inner cylinder member 61 has a minute scratch MS, the length of the leakage path from the minute scratch MS to the opening 63a at one end of the outer tube member 63 is L can be effectively secured. Therefore, it becomes possible to take effective measures against electric leakage even against minute scratches MS in the motor side lead wire 47 inside the inner cylinder member 61.

On the other hand, in this electric compressor, the inside of the terminal accommodating chamber 51a of the connector housing 51 communicates with the motor accommodating chamber 3a via the second gap 63c. Therefore, the air inside the connector housing 51 can be released to the motor housing chamber 3a through the second gap 63c. Therefore, even if the inside of the connector housing 51 becomes high temperature, the pressure inside the connector housing 51 will not increase excessively.

Therefore, according to this electric compressor, by covering the motor side lead wire 47 with the cylindrical member 60, excessive pressure rise inside the connector housing 51 can be prevented, and minute scratches on the motor side lead wire 47 inside the cylindrical member 60 can be prevented. It becomes possible to take effective earth leakage countermeasures against MS as well.

In this electric compressor, the length Ld in which the inner cylinder member 61 and the outer cylinder member 63 overlap in the motor housing chamber 3a is longer than the length Li of only the inner cylinder member 61, and the outer cylinder member It is longer than the length Lo of only 63. For this reason, the electric leakage countermeasure by making the cylinder member 60 have a double structure inside and outside becomes more effective. Note that the distance Lf between the end surface 51c of the connector housing 51, that is, the insertion port 51b, and the coil end 45 is determined by the length Li of only the inner cylinder member 61, the overlapping length Ld, and the length Lo of only the outer cylinder member 63. defined as the total length of

In this electric compressor, the size G2 of the second gap 63c is smaller than the size G1 of the first gap 61c. The length L of the leakage path from the minute scratch MS on the motor side lead wire 47 in the inner tube member 61 to the opening 63a at one end of the outer tube member 63 is the length L from the minute scratch MS on the other end of the inner tube member 61. This is the sum of the length L1 of the first gap 61c to the opening 61b and the length L2 of the second gap 63c from the opening 61b at the other end of the inner cylinder member 61 to the opening 63a at one end of the outer cylinder member 63. The length L1 of the first gap 61c can be short or long depending on the position of the minute scratch MS on the motor side lead wire 47. On the other hand, the length L2 of the second gap 63c is equal to the overlapping length Ld between the inner cylinder member 61 and the outer cylinder member 63. Therefore, by setting the overlapping length Ld between the inner cylinder member 61 and the outer cylinder member 63 to a predetermined value or more, it is possible to make the length L2 of the second gap 63c, which has a narrow earth leakage path and is effective as a measure against electric leakage, to a predetermined value or more. Therefore, irrespective of the position of the minute scratch MS on the motor side lead wire 47 inside the inner cylinder member 61, the above-mentioned electric leakage countermeasure effect can be exerted to a greater extent than a predetermined value.

In this electric compressor, the resin 49 closes the opening 61a at one end of the inner cylinder member 61, and the resin 49 connects one end of the inner cylinder member 61 to the coil end 45. Therefore, the opening 61a can be easily and reliably closed. One end of the inner cylindrical member 61 may be integrally and airtightly joined to the coil end 45 by resin molding, and in this case as well, the opening 61a of the inner cylindrical member 61 can be easily and reliably closed. The resin 49 that closes the opening 61a at one end of the inner cylindrical member 61 and the resin 49 that covers the coil end 45 may be made of different materials and bonded together when they are cured.

(Example 2)
The electric compressor of Example 2 has the same configuration as the electric compressor of Example 1, except that the configurations of the cylindrical member 60 and connector 50 in the electric compressor of Example 1 have been changed. In a connector 50 for an electric compressor according to the second embodiment, as shown in FIG. 4, a connector housing 51 having a terminal accommodating chamber 51a and an insertion port 51b integrally includes a plurality of outer cylindrical portions 65 made of an insulating material. ing.

Each outer cylinder part 65 extends continuously from the insertion opening 51b of the connector housing 50 in a cylindrical shape, and covers the inner cylinder member 61 while forming a second gap 65c between the outer cylinder part 65 and the inner cylinder member 61. One end of the outer cylindrical portion 65 extends to the vicinity of the coil end 45, and an opening 65a at one end is open within the motor housing chamber 3a. Thereby, the opening 65a communicates the inside of the outer cylinder portion 65 and the motor housing chamber 3a. On the other hand, an opening 65b at the other end of the outer cylinder portion 65 communicates with the insertion port 51b. Thereby, the opening 65b communicates the inside of the outer cylinder portion 65 with the terminal accommodating chamber 51a via the insertion port 51b.

In the motor housing 3, the length Ld in which the inner cylinder member 61 and the outer cylinder part 65 overlap is longer than the length Li of only the inner cylinder member 61 and longer than the length Lo of only the outer cylinder part 65. It has been lengthened. Further, the size G2 of the second gap 65c is smaller than the size G1 of the first gap 61c.

In the electric compressor of the second embodiment, the outer cylindrical portion 65 acts in the same manner as the outer cylindrical member 63 of the electric compressor of the first embodiment, so by covering the motor side lead wire 47 with the cylindrical member 60, the inside of the connector housing 51 is removed. While preventing an excessive pressure rise, it is possible to take effective measures against electric leakage even against minute scratches MS on the motor side lead wire 47 inside the cylinder member 60.

In this electric compressor, since the outer cylinder portion 65 is integrated with the connector housing 51, the number of parts and the number of assembly steps are reduced. Other functions of this electric compressor are similar to those of the electric compressor of the first embodiment.

(Example 3)
The electric compressor of Example 3 has the same configuration as the electric compressor of Example 1, except that the inner cylinder member 61 in the electric compressor of Example 1 is made longer. In the electric compressor of Example 3, as shown in FIG. 5, the other end of the inner cylindrical member 61 is located within the terminal accommodating chamber 51a. That is, the other end of the inner cylindrical member 61 extends into the terminal accommodating chamber 51a, and the opening 61b at the other end is open within the outer cylindrical member 63 at a position extending into the terminal accommodating chamber 51a. Thereby, the opening 61b communicates the inside of the inner cylinder member 61 and the inside of the outer cylinder member 63 near the other end of the outer cylinder member 63.

In this electric compressor, the overlapping length Ld between the inner cylinder member 61 and the outer cylinder member 63 is longer than that of the electric compressor of Example 1 by the length of the inner cylinder member 61. Therefore, the length L of the leakage path from the minute scratch MS on the motor side lead wire 47 in the inner cylinder member 61 to the opening 63a at one end of the outer cylinder member 63 is also the same as that of the electric compressor of the first embodiment. This makes it possible to make the current leakage countermeasure against the micro scratches MS more effective. Other functions of this electric compressor are similar to those of the electric compressor of the first embodiment.

(Reference example 1)
The electric compressor of Reference Example 1 has the same configuration as the electric compressor of Example 1, except that the opening 61b at the other end of the inner cylinder member 61 in the electric compressor of Example 1 is closed. In the electric compressor of Reference Example 1, as shown in FIG. 6, the opening 61b at the other end of the inner cylinder member 61 is closed with an insulating resin 67. That is, the resin 67 enters into the opening 61b and closes the opening 61b, so that the opening 61b at the other end of the inner cylinder member 61 is closed from the motor side lead wire 47.

In this electric compressor, openings 61a and 61b at both ends of the inner cylinder member 61 are both closed to the motor side lead wire 47. Therefore, even if the motor-side lead wire 47 inside the inner cylinder member 61 has a minute scratch MS, the liquid refrigerant will not come into contact with the minute scratch MS. Therefore, it is possible to take reliable measures against electric leakage against the minute scratches MS on the motor side lead wire 47 inside the inner cylinder member 61.

On the other hand, like the electric compressor of the first embodiment, the air inside the connector housing 51 can be released to the motor housing chamber 3a through the second gap 63c between the inner cylinder member 61 and the outer cylinder member 63. Even if the inside of the connector housing 51 becomes high temperature, the pressure inside the connector housing 51 will not increase excessively.

(Reference example 2)
The electric compressor of Reference Example 2 has the same configuration as the electric compressor of Example 2, except that the opening 61b at the other end of the inner cylinder member 61 in the electric compressor of Example 2 is closed. In the electric compressor of Reference Example 2, as shown in FIG. 7, the opening 61b at the other end of the inner cylinder member 61 is closed with an insulating resin 67, as in the electric compressor of Reference Example 1.

In this electric compressor, as in the electric compressor of Reference Example 2, the openings 61a and 61b at both ends of the inner cylinder member 61 are both closed to the motor side lead wire 47, so that there is no air inside the inner cylinder member 61. It becomes possible to take reliable measures against electric leakage against minute scratches MS on a certain motor side lead wire 47.

In the electric compressors of Reference Examples 1 and 2, the openings 61a and 61b at both ends of the inner cylinder member 61 are closed, so there is no need to intentionally provide the first gap 61c.

(Reference example 3)
The electric compressor of Reference Example 3 has the same configuration as the electric compressor of Example 1, except that the entire interior of the inner cylinder member 61 in the electric compressor of Example 1 is filled with resin 49. In the electric compressor of Reference Example 3, as shown in FIG. 8, the entire interior of the inner cylinder member 61 is filled with resin 49 up to the opening 61b at the other end. That is, the resin 49 penetrates to the opening 61b and closes the opening 61b, so that the opening 61b at the other end of the inner cylinder member 61 is closed from the motor side lead wire 47.

In this electric compressor, resin 49 covers lead wire 47 throughout the interior of inner cylinder member 61 . Therefore, even if the motor-side lead wire 47 inside the inner cylinder member 61 has a minute scratch MS, the liquid refrigerant will not come into contact with the minute scratch MS. Therefore, it is possible to take reliable measures against electric leakage against the minute scratches MS on the motor side lead wire 47 inside the inner cylinder member 61.

On the other hand, like the electric compressor of the first embodiment, the air inside the connector housing 51 can be released to the motor housing chamber 3a through the second gap 63c between the inner cylinder member 61 and the outer cylinder member 63. Even if the inside of the connector housing 51 becomes high temperature, the pressure inside the connector housing 51 will not increase excessively.

In the above, the present invention has been explained based on Examples 1 to 3, but the present invention is not limited to Examples 1 to 3, and can be applied with appropriate changes without departing from the spirit thereof. Needless to say.

For example, in Examples 1 to 3 above, the compression mechanism 10 is a scroll type, but in the electric compressor of the present invention, it is also possible to employ other types of compression mechanisms such as a swash plate type and a vane type.

Furthermore, an electric compressor may be formed by appropriately combining the configurations of Examples 1 to 3.

INDUSTRIAL APPLICATION This invention can be utilized for air conditioners, such as a vehicle.

DESCRIPTION OF SYMBOLS 10... Compression mechanism 12... Motor mechanism 3a... Motor housing chamber 14... Housing 16... Inverter circuit 41... Stator core 45... Coil end 47... Lead wire 50... Connector 61c... First gap 61... Inner cylinder member 57... Terminal 51a... Terminal Accommodation chamber 51b...Insertion port 51...Connector housing 63c...Second gap 63...Outer cylinder member 61a...Opening at one end of the inner cylinder member 61b...Opening at the other end of the inner cylinder member 63a...Opening at one end of the outer cylinder member 63b... Opening at the other end of the outer cylinder member Ld...Length of overlap between the inner cylinder member and the outer cylinder member Li...Length of only the inner cylinder member Lo...Length of only the outer cylinder member 65...Outer cylinder part 65a... Opening at one end of the outer cylinder part 65b... Opening at the other end of the outer cylinder part G1... Size of the first gap G2... Size of the second gap

Claims (3)

a compression mechanism that compresses refrigerant;
a motor mechanism that drives the compression mechanism;
a metal housing having a motor accommodation chamber therein for accommodating the motor mechanism;
an inverter circuit that drives the motor mechanism;
The motor mechanism is
a cylindrical stator core fixed to the housing;
a coil end formed by winding a conductive wire having an insulating coating around the stator core and protruding from an end surface of the stator core;
a lead wire made of the conductive wire pulled out from the coil end;
a connector that electrically connects the lead wire and the inverter circuit,
The connector is
a terminal electrically connected to the tip of the lead wire;
An electric compressor comprising a terminal accommodating chamber for accommodating the terminal and a connector housing made of an insulating material and having an insertion opening into which the lead wire is inserted,
The motor mechanism includes a first insulating member that is cylindrical and into which the lead wire is inserted, and a second insulating member into which the first insulating member is inserted with a gap,
The first insulating member is sealed at one end with the lead wire with an insulating resin,
The second insulating member is inserted into the insertion port and covers the other end of the first insulating member,
A space between the second insulating member and the insertion port is sealed,
The resin covers the lead wire and the coil end extending from the first insulating member,
The electric compressor is characterized in that the terminal housing chamber and the motor housing chamber communicate with each other via the gap. The electric compressor according to claim 1, wherein the second insulating member and the connector housing are integrally formed. The electric compressor according to claim 1 or 2, wherein a gap between the first insulating member and the second insulating member is smaller than a gap between the lead wire and the first insulating member.

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