Scroll-Type Fluid Machiner

Abstract

A scroll-type fluid machine is configured so that the scroll-type fluid machine has compact, lightweight, and long life characteristics obtained by mounting, without increasing the diameter of the barrel, a bearing having a higher load capacity and so that a degradation in the performance due to a pressure loss during a high flow-rate operation is minimized by providing the gas flow path in the center plate with a sufficient cross-sectional area. A scroll-type fluid machine is provided with: a first housing which contains a scroll mechanism; a second housing which contains an electric motor; and a center plate which is disposed between both the housings, which contains a motion conversion mechanism for converting rotational motion to orbiting motion, which has mounted thereto a rotation prevention mechanism for preventing the rotation of a movable scroll, and which holds the bearing for supporting the main shaft. At least a part of the fluid path, which connects the insides of the first and second housings through the portion at which the center plate is disposed, is configured to connect an axial recess and a radial recess which are formed in the center plate, the axial recess facing the inside of the second housing and extending in the axial direction, the radial recess being located closer to the first housing than the bearing and extending in the radial direction.

1 . A scroll-type fluid machine comprising:
 a first housing which houses a scroll mechanism made of a fixed scroll and a movable scroll;   a second housing which houses an electric motor to rotate a main shaft; and   a center plate, which is interposed between said housings, which has a motion conversion mechanism to convert a rotation motion of said main shaft to a swing motion of said movable scroll, which is provided with a rotation preventing mechanism for said movable scroll, and which holds a bearing to hold said main shaft, and a fluid path which communicates an inside of said second housing and an inside of said first housing through an installation part of said center plate,   wherein at least a part of said fluid path is formed by connecting an axial recessed portion and a radial recessed portion, which are formed in said center plate, said axial recessed portion facing said inside of said second housing and extending in an axial direction, said radial recessed portion being located closer to said first housing than said bearing and extending in a radial direction.   
     
     
         2 . The scroll-type fluid machine according to  claim 1 , wherein a plurality of said axial recessed portions are formed along a circumferential direction. 
     
     
         3 . The scroll-type fluid machine according to  claim 1 , wherein a part of an inner surface of said axial recessed portion is formed to be a surface extending in a shape tapered toward said inside of said second housing. 
     
     
         4 . The scroll-type fluid machine according to  claim 1 , wherein said radial recessed portion is formed to be a ring-shaped recess extending in a circumferential direction. 
     
     
         5 . The scroll-type fluid machine according to  claim 1 , wherein a part of an inner surface of said radial recessed portion is formed to be a surface extending in a shape tapered toward said inside of said second housing from said inside of said first housing. 
     
     
         6 . The scroll-type fluid machine according to  claim 1 , wherein said axial recessed portion is provided at a time of producing a material for said center plate. 
     
     
         7 . The scroll-type fluid machine according to  claim 6 , wherein said material for said center plate is produced by casting and said axial recessed portion is formed with a die. 
     
     
         8 . The scroll-type fluid machine according to  claim 1 , wherein said radial recessed portion is formed by machining. 
     
     
         9 . The scroll-type fluid machine according to  claim 1 , wherein said center plate is formed integrally with either said first housing or said second housing.