Scroll component of compression mechanism, compression mechanism, and scroll compressor

Abstract

A scroll component of a compression mechanism, a compression mechanism having the scroll component, and a scroll compressor. A scroll blade of the scroll component comprises a compression section and an extension section, which are connected to each other, wherein the compression section is located on an inner side of the extension section in a profile line direction; the radial thickness of the extension section is less than the radial thickness of the compression section; and a material-removed section is formed at the extension section, and a chamber constructed by the extension section is in communication with a low-pressure environment outside a compression mechanism via the material-removed section. Therefore, the effect of improving the fatigue strength is achieved.

1 . A scroll component of a compression mechanism, comprising:
 an end plate;   a scroll blade formed on one side of the end plate and extending from an approximate center of the end plate in a spiral profile line direction from an inner side to an outer side,   wherein the scroll blade comprises a compression section and an extension section connected to each other, the compression section is located on an inner side of the extension section in the profile line direction, and the compression section is configured for constructing a chamber for compression operation, and   the extension section has a radial thickness smaller than that of the compression section, and the extension section is formed with a material-removed part, and a chamber constructed by the extension section can be communicated with a low-pressure environment outside the compression mechanism via the material-removed part.   
     
     
         2 . The scroll component of the compression mechanism according to  claim 1 , wherein the scroll component is a fixed scroll, the fixed scroll further comprises an outer peripheral wall provided around the scroll blade, and the extension section is provided to closely abut against a radial inner surface of the outer peripheral wall. 
     
     
         3 . The scroll component of the compression mechanism according to  claim 2 , wherein the extension section is provided in a region of maximum stiffness of the outer peripheral wall. 
     
     
         4 . The scroll component of the compression mechanism according to  claim 2 , wherein the outer peripheral wall is formed with an air suction window for allowing working fluid to enter the compression mechanism, and the extension section extends to the air suction window in the profile line direction, so that the outermost contact point of the scroll blade in the profile line direction is already in contact state while the innermost contact point of the scroll blade in the profile line direction is not yet out of contact state during operation of the compression mechanism. 
     
     
         5 . The scroll component of the compression mechanism according to  claim 1 , wherein the material-removed part is configured as an upper side portion or a lower side portion of the extension section in an axial direction having material removed, so that the scroll blade has a step shape in the axial direction. 
     
     
         6 . The scroll component of the compression mechanism according to  claim 1 , wherein the angle along which the extension sections extend in the profile line direction is greater than or equal to 20° and less than 120°. 
     
     
         7 . The scroll component of the compression mechanism according to  claim 2 , wherein the material-removed part is configured as one or more orifices penetrating through the extension section in a thickness direction thereof, and the orifice is aligned and communicated with a through-hole formed in the outer peripheral wall, which is in direct communication with the low-pressure environment outside the compression mechanism. 
     
     
         8 . The scroll component of the compression mechanism according to  claim 7 , wherein the orifice is arranged along the profile line direction or along an axial direction,
 the orifice is formed as multiple circular holes or a single elongated slot.   
     
     
         9 . The scroll component of the compression mechanism according to  claim 2 , wherein the material-removed part is configured as an elongated slot, which penetrates through the extension section in a thickness direction thereof and extends up to an outer end of the extension section in the profile line direction. 
     
     
         10 . The scroll component of the compression mechanism according to  claim 9 , wherein the elongated slot is communicated with a communication groove formed in the outer peripheral wall, the communication groove extends outward from an outer end of the elongated slot; the outer peripheral wall is formed with an air suction window for allowing working fluid to enter the compression mechanism; and the communication groove is configured as a through-hole directly communicated with the low-pressure environment outside the compression mechanism, or alternatively the communication groove is configured as a semi-groove which is recessed from the radial inner surface of the outer peripheral wall and communicated with the air suction window. 
     
     
         11 . A compression mechanism, comprising a fixed scroll and an orbiting scroll engaged with each other to form a series of compression chambers between the fixed scroll and the orbiting scroll, wherein the fixed scroll or the orbiting scroll is configured as the scroll component according to  claim 1 . 
     
     
         12 . The compression mechanism according to  claim 11 , wherein the extension section of the scroll blade of one of the fixed scroll and the orbiting scroll can come into contact with the other of the fixed scroll and the orbiting scroll, but the extension section is not used to form the compression chamber. 
     
     
         13 . A scroll compressor, wherein it comprises the compression mechanism according to  claim 11 .