Scroll Fluidic Device

Abstract

Provided is a scroll fluidic device that is capable of reducing suction pressure loss as well as suppressing discharge pulsations and reducing noise. The scroll fluidic device is characterized in that a fixed scroll member is integrally formed with a center housing on the inside of the center housing disposed between a front housing and a rear housing; the end surface of the outer shell of the center housing is positioned lower than the height of a scroll lap of the fixed scroll member, with an end plate of the fixed scroll member served as a reference of position in the height direction; and a corridor-like space extending in the device circumferential direction, which is surrounded by an outer shell forming portion of the center housing, the inner surface of an outer shell of the front housing, the scroll lap of the fixed scroll member, and the end plate of a movable scroll member, is formed.

1 . A scroll fluidic device wherein a scroll lap is formed on an end plate of a fixed scroll member integrally with the end plate, a scroll lap is formed on an end plate of a movable scroll member integrally with the end plate, both scroll members are disposed so that angles of both scroll laps are shifted from each other and side walls of both scroll laps are partially brought into contact with each other, and a volume of a fluid pocket, which is a closed space formed between both scroll laps, is changed by moving said fluid pocket from an outer end section of the scroll laps toward a center section of the scroll laps or from the center section of the scroll laps toward the outer end section of the scroll laps by revolving said movable scroll member on a circular orbit at a condition preventing rotation of said movable scroll member, characterized in that said fixed scroll member is integrally formed with a center housing, which is disposed between a front housing and a rear housing of the scroll fluidic device, in said center housing; an end surface of an outer shell of said center housing is positioned lower than a height of said scroll lap of said fixed scroll member, with said end plate of said fixed scroll member served as a reference of position in a height direction; and a corridor-like space extending in a device circumferential direction, which is surrounded by an outer shell forming portion of said center housing, an inner surface of an outer shell of said front housing, said scroll lap of said fixed scroll member, and said end plate of said movable scroll member, is formed. 
     
     
         2 . The scroll fluidic device according to  claim 1 , wherein, at a phase angle at which a distance between an inner surface of an outer circumferential end of said scroll lap of said movable scroll member and an outer surface of said scroll lap of said fixed scroll member facing to said inner surface of said outer circumferential end of said scroll lap of said movable scroll member becomes maximum, a cross-sectional area A 1  of said corridor-like space satisfies the following relationship with a sectional area A 2  of a port provided on said front housing.
     A 2/2< A 1< A 2 
 
     
     
         3 . The scroll fluidic device according to  claim 1 , wherein said corridor-like space is always opened to a suction chamber of suction fluid or a discharge chamber of expansion fluid which is positioned at a side opposite to a side of said fixed scroll member with reference to said end plate of said movable scroll member. 
     
     
         4 . The scroll fluidic device according to  claim 1 , wherein a port directly fronting said corridor-like space is provided to said front housing. 
     
     
         5 . The scroll fluidic device according to  claim 1 , wherein, on an outer surface side of said outer shell of said center housing, a recessed outer surface of said outer shell having a predetermined thickness is formed relatively to a wall forming a wall surface, which contributes to change of volume of said fluid pocket, and a wall forming a wall surface, which faces said corridor-like space, of said scroll lap of said fixed scroll member. 
     
     
         6 . The scroll fluidic device according to  claim 1 , wherein, on an inner surface side of said outer shell of said center housing, a cup-like thickness relief portion extending in the same direction as said height direction of said scroll lap of said fixed scroll member is provided between a wall forming a wall surface, which contributes to change of volume of said fluid pocket, of said scroll lap of said fixed scroll member, and a wall forming an outer surface of said outer shell. 
     
     
         7 . The scroll fluidic device according to  claim 6 , wherein said thickness relief portion opens toward a side of said rear housing. 
     
     
         8 . The scroll fluidic device according to  claim 7 , wherein said thickness relief portion forms a second discharge chamber communicating with a first discharge chamber formed in said rear housing via a throttled portion to form a scroll compressor. 
     
     
         9 . The scroll fluidic device according to  claim 8 , wherein a discharge port from said second discharge chamber is provided to said center housing. 
     
     
         10 . The scroll fluidic device according to  claim 8 , wherein said throttled portion is formed by an inner outline of a gasket sealing between said center housing and said rear housing and an outline of an opening portion of said second discharge chamber. 
     
     
         11 . The scroll fluidic device according to  claim 8 , wherein a discharge port from said second discharge chamber is provided to said rear housing. 
     
     
         12 . The scroll fluidic device according to  claim 7 , wherein said thickness relief portion forms an oil storage chamber communicating with a discharge chamber formed in said rear housing for storing oil present in said discharge chamber to form a scroll compressor. 
     
     
         13 . The scroll fluidic device according to  claim 12 , wherein a filter is provided between said oil storage chamber and said discharge chamber. 
     
     
         14 . The scroll fluidic device according to  claim 12 , wherein said oil storage chamber and said corridor-like space are communicated with each other through an orifice. 
     
     
         15 . The scroll fluidic device according to  claim 7 , wherein a discharge chamber and a suction chamber are formed via a partition wall in said rear housing, and said suction chamber communicates with said corridor-like space through said thickness relief portion, to form a scroll compressor. 
     
     
         16 . The scroll fluidic device according to  claim 6 , wherein said thickness relief portion opens toward a side of said front housing. 
     
     
         17 . The scroll fluidic device according to  claim 16 , wherein a cross-sectional area of said thickness relief portion changes in said device circumferential direction. 
     
     
         18 . The scroll fluidic device according to  claim 16 , wherein said thickness relief portion communicates with said corridor-like space. 
     
     
         19 . The scroll fluidic device according to  claim 18 , wherein a suction port to said corridor-like space is provided to said center housing to form a scroll compressor. 
     
     
         20 . The scroll fluidic device according to  claim 1 , wherein said scroll fluidic device is used as a compressor for an air conditioning system for a vehicle.