Scroll compressor

Abstract

The scroll compressor is provided that may include a casing including a rotational shaft; a discharge cover fixed inside of the casing to partition the inside of the casing into a suction space and a discharge space; a back pressure plate that defines a back pressure chamber that accommodates a refrigerant, a floating plate to define the back pressure chamber together with the back pressure plate, the floating plate including a contact or rib capable of contacting the discharge cover, and a coating layer that defines an outer surface of the contact. The discharge cover may have a first hardness value, the floating plate may have a second hardness value, and the coating layer may have a third hardness value. The third hardness value may be less than the first hardness value and greater than the second hardness value.

What is claimed is: 
     
         1 . A scroll compressor, comprising:
 a casing comprising a rotational shaft;   a discharge cover fixed inside of the casing to partition the inside of the casing into a suction space and a discharge space;   a first scroll that is revolved by rotation of the rotational shaft;   a second scroll that defines a plurality of compression chambers together with the first scroll, the second scroll having an intermediate pressure discharge hole that communicates with a compression chamber having an intermediate pressure of the plurality of compression chambers;   a back pressure plate that defines a back pressure chamber that accommodates a refrigerant discharged from the intermediate pressure discharge hole;   a floating plate movably disposed on or at a side of the back pressure plate to define the back pressure chamber together with the back pressure plate, the floating plate comprising a contact capable of contacting the discharge cover; and   a coating layer that defines an outer surface of the contact, wherein the discharge cover has a first hardness value, the floating plate has a second hardness value, and the coating layer has a third hardness value, and wherein the third hardness value is less than the first hardness value and greater than the second hardness value.   
     
     
         2 . The scroll compressor according to  claim 1 , wherein the floating plate is formed of an aluminum material, and the coating layer comprises an anodizing film. 
     
     
         3 . The scroll compressor according to  claim 2 , wherein the coating layer has a thickness of about 25 μm to about 35 μm. 
     
     
         4 . The scroll compressor according to  claim 1 , wherein a difference between the first hardness value and the third hardness value is above about 80 HV. 
     
     
         5 . The scroll compressor according to  claim 1 , wherein the first hardness value is above about 500 HV, the second hardness value is below about 110 HV, and the third hardness value ranges from about 300 HV to about 420 HV. 
     
     
         6 . The scroll compressor according to  claim 1 , wherein the coating layer is formed on an entire outer circumferential surface of the floating plate. 
     
     
         7 . The scroll compressor according to  claim 1 , wherein a discharge guide that guides discharge of a refrigerant within the back pressure chamber is disposed on the first scroll or the second scroll. 
     
     
         8 . The scroll compressor according to  claim 1 , wherein the discharge cover comprises an impact absorption layer disposed at a portion thereof that faces the contact. 
     
     
         9 . The scroll compressor according to  claim 8 , wherein the coating layer has a hardness value greater than a hardness value of the impact absorption layer. 
     
     
         10 . The scroll compressor according to  claim 8 , wherein the impact absorption layer is formed of a Teflon material. 
     
     
         11 . The scroll compressor according to  claim 8 , wherein the impact absorption layer is applied to the discharge cover or inserted into a groove formed in the discharge cover. 
     
     
         12 . The scroll compressor according to  claim 1 , wherein the contact comprises a rib that extends along an inner circumference of the floating plate. 
     
     
         13 . The scroll compressor according to  claim 1 , wherein the first scroll comprises an orbiting scroll and the second scroll comprises a fixed scroll. 
     
     
         14 . A scroll compressor, comprising:
 a casing comprising a rotational shaft;   a discharge cover fixed inside of the casing to partition the inside of the casing into a suction space and a discharge space;   a first scroll that is revolved by rotation of the rotational shaft;   a second scroll that defines a plurality of compression chambers together with the first scroll, the second scroll having an intermediate pressure discharge hole that communicates with a compression chamber having an intermediate pressure of the plurality of compression chambers;   a back pressure plate that defines a back pressure chamber that accommodates a refrigerant discharged from the intermediate pressure discharge hole;   a floating plate movably disposed on or at a side of the back pressure plate to define the back pressure chamber together with the back pressure plate, the floating plate comprising a contact capable of contacting the discharge cover;   a coating layer that defines an outer surface of the contact; and   an impact absorption layer disposed on a portion of the discharge cover that faces the contact.   
     
     
         15 . The scroll compressor according to  claim 14 , wherein the coating layer has a hardness value greater than a hardness value of the impact absorption layer. 
     
     
         16 . The scroll compressor according to  claim 14 , wherein the impact absorption layer is formed of a Teflon material. 
     
     
         17 . The scroll compressor according to  claim 14 , wherein the discharge cover comprises a groove that accommodates the impact absorption layer. 
     
     
         18 . The scroll compressor according to  claim 14 , wherein the impact absorption layer is applied to a surface of the discharge cover that faces the back pressure plate. 
     
     
         19 . The scroll compressor according to  claim 14 , wherein the impact absorption layer has a thickness thicker than a thickness of the coating layer. 
     
     
         20 . The scroll compressor according to  claim 19 , wherein the impact absorption layer has a thickness of about 50 μm. 
     
     
         21 . The scroll compressor according to  claim 19 , wherein the coating layer has a thickness of about 25 μm to about 35 μm. 
     
     
         22 . The scroll compressor according to  claim 14 , wherein the floating plate is formed of an aluminum material, and the coating layer comprises an anodizing film. 
     
     
         23 . The scroll compressor according to  claim 14 , wherein the contact comprises a rib that extends along an inner circumference of the floating plate. 
     
     
         24 . The scroll compressor according to  claim 14 , wherein the first scroll comprises an orbiting scroll and the second scroll comprises a fixed scroll. 
     
     
         25 . A scroll compressor, comprising:
 a casing comprising a rotational shaft;   a discharge cover fixed inside of the casing to partition the inside of the casing into a suction space and a discharge space;   an orbiting scroll that is revolved by rotation of the rotational shaft;   a fixed scroll that defines a plurality of compression chambers together with the orbiting scroll, the fixed scroll having an intermediate pressure discharge hole that communicates with a compression chamber having an intermediate pressure of the plurality of compression chambers;   a back pressure plate that defines a back pressure chamber that accommodates a refrigerant discharged from the intermediate pressure discharge hole;   a floating plate movably disposed on or at a side of the back pressure plate to define the back pressure chamber together with the back pressure plate, the floating plate comprising a rib capable of contacting the discharge cover, wherein the rib is disposed at an upper surface of the floating plate; and   a coating layer provided at an outer surface of the rib, wherein the discharge cover has a first hardness value, the floating plate has a second hardness value, and the coating layer has a third hardness value, and wherein the third hardness value is less than the first hardness value and greater than the second hardness value.