Electric compressor

Abstract

An electric compressor includes: a rotary shaft to which a compressor impeller is attached; a stator portion which is disposed around the rotary shaft; and a motor housing which accommodates the stator portion. The motor housing includes an inner housing which includes a first cylindrical portion surrounding and holding the stator portion and an outer housing which includes a second cylindrical portion surrounding and holding the first cylindrical portion of the inner housing. Between an outer surface of the inner housing and an inner surface of the outer housing, a cooling jacket portion is formed in a part of a circumferential direction about the rotary shaft. The inner housing includes a first end wall portion which is formed to be continuous to the first cylindrical portion and extends inward in relation to an outer peripheral portion of the stator portion in a radial direction of the rotary shaft.

1 . An electric compressor comprising:
 a rotary shaft to which a compressor impeller is attached;   a stator portion which is disposed around the rotary shaft; and   a motor housing which accommodates the stator portion,   wherein the motor housing includes an inner housing which includes a first cylindrical portion surrounding and holding the stator portion and an outer housing which includes a second cylindrical portion surrounding and holding the first cylindrical portion of the inner housing,   wherein, between an outer surface of the inner housing and an inner surface of the outer housing, a cooling jacket portion is formed in a part of a circumferential direction about the rotary shaft, and   wherein the inner housing includes a first end wall portion which is formed to be continuous to the first cylindrical portion and extends inward in relation to an outer peripheral portion of the stator portion in a radial direction of the rotary shaft.   
     
     
         2 . The electric compressor according to  claim 1 ,
 wherein the cooling jacket portion includes a first end portion and a second end portion which are an inlet and an outlet of a cooling fluid.   
     
     
         3 . The electric compressor according to  claim 1 ,
 wherein a contact plane in which the outer surface of the inner housing contacts the inner surface of the outer housing is formed between the outer surface of the inner housing and the inner surface of the outer housing,   wherein at least one of the inner housing and the outer housing includes a recess portion which is recessed with respect to the contact plane and forms the cooling jacket portion, and   wherein the recess portion of the inner housing or the outer housing is formed only in the part of the circumferential direction so that the cooling jacket portion is formed in the part of the circumferential direction.   
     
     
         4 . The electric compressor according to  claim 1 , further comprising:
 a bearing which is provided inside the motor housing and supports the rotary shaft,   wherein the first end wall portion of the inner housing includes an annular portion through which the rotary shaft penetrates and which surrounds the bearing and the annular portion holds the bearing.   
     
     
         5 . The electric compressor according to  claim 2 , further comprising:
 a bearing which is provided inside the motor housing and supports the rotary shaft,   wherein the first end wall portion of the inner housing includes an annular portion through which the rotary shaft penetrates and which surrounds the bearing and the annular portion holds the bearing.   
     
     
         6 . The electric compressor according to  claim 3 , further comprising:
 a bearing which is provided inside the motor housing and supports the rotary shaft,   wherein the first end wall portion of the inner housing includes an annular portion through which the rotary shaft penetrates and which surrounds the bearing and the annular portion holds the bearing.