Sealed terminal device for motor-driven compressor
View Patent ↗A sealed terminal device for a motor-driven compressor has an electrically insulating terminal holder ( 12 ) to be attached to the housing wall ( 2 a ) of the motor-driven compressor, a plurality of sealed terminals ( 18 ) held in the terminal holder ( 12 ), for penetrating the housing wall ( 2 a ) with play to the housing wall ( 2 a ), and a groove ( 40 ) or cavity ( 38 ) formed in the terminal holder ( 12 ) to increase a creepage distance for insulation between the sealed terminals.
1. A sealed terminal device for a motor-driven compressor including a housing, and an electric motor and a compressing unit which are accommodated in the housing, comprising:
a terminal holder to be attached to a wall of the housing and including internal and external holder half bodies which have electric insulation and sandwiching the wall;
a plurality of sealed terminals held in said terminal holder, each sealed terminal penetrating the wall with play thereto and having both end portions to be electrically connected to the electric motor and an external device;
seal members for sealing between the wall and said terminal holder and between said terminal holder and said sealed terminals, respectively; and
an insulating element for increasing a degree of electric insulation between said sealed terminal and a surrounding thereof,
wherein said insulating element includes an area formed in said terminal holder to increase a creepage distance for insulation of at least one of between said sealed terminals and between the wall and said sealed terminals,
wherein said area includes a groove formed in an outer surface of said terminal holder, and extending between said sealed terminals, and
wherein the groove extends in a radial direction of said terminal holder.
2. The sealed terminal device according to claim 1 , wherein said area has a cavity formed in said terminal holder, and positioned to surround said sealed terminals, and adjacent to the wall.
3. The sealed terminal device according to claim 1 , wherein said insulating element includes an electric insulation barrier between said sealed terminals.
4. The sealed terminal device according to claim 3 , wherein the electric insulation barrier has an electrical insulation layer formed on an outer surface of said sealed terminal.
5. The sealed terminal device according to claim 4 , wherein the electrical insulation layer covers an entire outer surface of said sealed terminal except for both the end portions of said sealed terminal.
6. The sealed terminal device according to claim 1 , wherein said insulating element includes an insulating sleeve to fill in the play between the wall of the housing and said sealed terminal.
7. The sealed terminal device according to claim 1 , wherein said sealed terminal also serves as a fastening bolt to attach said terminal holder to the wall of the housing.
8. The sealed terminal device according to claim 7 , wherein said sealed terminal further includes:
a rod having one end to be positioned on the electric motor side and the other end to be positioned on the external device side;
a flange formed on the rod for sandwiching one of the holder half bodies between the flange and the wall; and
a fastening nut attached to the other end of the rod to fasten the other one of the holder half bodies between the nut and the wall of the housing.
9. The sealed terminal device according to claim 7 , wherein said terminal holder further includes a stopper surface which makes a lock for said sealed terminal.