Device having a pulsation reducing structure, a passage forming body and compressor

Abstract

Pulsation of gas spreads from a pulsation source to a gas passage in a device. A muffler is located in a part of the gas passage. A combined passage is located upstream or downstream of the muffler with respect to a flowing direction of gas. The combined passage includes a restricting passage and a pressure restoring passage, which are connected in series. The pressure restoring passage is located downstream of the restricting passage with respect to the flowing direction of gas. The muffler is located between the pulsation source and the combined passage in the gas passage. Therefore, the device obtains sufficient pulsation reducing effect and suppresses pressure loss.

1 . A device having a pulsation reducing structure, the device comprising: 
 a gas passage;    a pulsation source connected to the gas passage, wherein pulsation of gas spreads from the pulsation source to the gas passage;    a muffler for reducing the pulsation, wherein the muffler is located in a part of the gas passage; and    a combined passage located in the gas passage, the combined passage is located upstream or downstream of the muffler with respect to a flowing direction of gas, the combined passage including a restricting passage and a pressure restoring passage, the restricting passage and the pressure restoring passage being connected in series, wherein the pressure restoring passage is located downstream of the restricting passage with respect to the flowing direction of gas, and wherein the muffler is located between the pulsation source and the combined passage in the gas passage.    
   
   
       2 . The device according to  claim 1 , wherein the cross-sectional area of the pressure restoring passage is greater than the cross-sectional area of the restricting passage.  
   
   
       3 . The device according to  claim 1 , wherein the cross-sectional area of the pressure restoring passage is gradually increased in the flowing direction of gas.  
   
   
       4 . The device according to  claim 1 , wherein the pressure restoring passage is widened in the flowing direction of gas.  
   
   
       5 . The device according to  claim 4 , wherein the widening angle of the pressure restoring passage is less than or equal to 20 degrees.  
   
   
       6 . The device according to  claim 1 , wherein the combined passage is defined by a pipe located in the gas passage.  
   
   
       7 . The device according to  claim 6 , further comprising a housing that defines the gas passage, wherein the pipe is formed separately from the housing.  
   
   
       8 . The device according to  claim 6 , wherein at least part of the pipe is located in the muffler.  
   
   
       9 . The device according to  claim 8 , wherein the pipe also functions as an oil separator, which separates oil from gas flowing through the gas passage.  
   
   
       10 . The device according to  claim 6 , wherein the pipe includes an introduction passage, the introduction passage being located upstream of the restricting passage with respect to the flowing direction of gas, wherein the introduction passage is connected to the restricting passage in series, and the introduction passage is tapered toward the restricting passage.  
   
   
       11 . The device according to  claim 1 , wherein an inlet of the restricting passage is widened in a direction opposite to the flowing direction of gas.  
   
   
       12 . The device according to  claim 1 , wherein the combined passage is one of a plurality of combined passages, wherein the combined passages are arranged in parallel.  
   
   
       13 . The device according to  claim 1 , wherein the device is a compressor for a vehicle air conditioner.  
   
   
       14 . The device according to  claim 1 , wherein the device is provided in an exhaust system attached to a vehicle engine.  
   
   
       15 . A passage forming body having a plurality of combined passages, the combined passages being arranged in parallel, wherein each combined passage includes a restricting passage and a pressure restoring passage, and wherein, in each combined passage, the restricting passage is combined with the pressure restoring passage in series.  
   
   
       16 . A scroll compressor, comprising: 
 a compression mechanism including a movable scroll and a fixed scroll, the scrolls defining a compression chamber;    a discharge chamber for receiving gas discharged from the compression chamber;    a discharge gas passage for guiding discharge gas from the discharge chamber to the outside of the compressor;    a restricting passage located in the discharge gas passage; and    a pressure restoring passage located in the discharge gas passage, wherein the pressure restoring passage is connected to the restricting passage in series and located downstream of the restricting passage with respect to a flowing direction of gas.    
   
   
       17 . The compressor according to  claim 16 , wherein the pressure restoring passage is widened in the flowing direction of gas, the widening angle being less than or equal to 20 degrees.  
   
   
       18 . The compressor according to  claim 16 , further comprising: 
 a suction chamber for temporarily storing gas before the gas is drawn into the compression chamber; and    a suction gas passage for guiding gas into the suction chamber from the outside of the compressor,    wherein the suction gas passage includes a suction restricting passage and a suction pressure restoring passage that is located downstream of the suction restricting passage with respect to the flowing direction of gas.    
   
   
       19 . A piston type compressor, comprising: 
 a compression chamber;    a discharge chamber into which gas compressed in the compression chamber is discharged; and    a discharge gas passage for guiding gas from the discharge chamber to the outside of the compressor, the discharge gas passage including a muffler, a restricting passage, and a pressure restoring passage, wherein the muffler reduces discharge pulsation of gas, which pulsation spreads from the discharge chamber through the discharge gas passage, the restricting passage is located downstream of the muffler with respect to a flowing direction of gas, and the pressure restoring passage is located downstream of the restricting passage.    
   
   
       20 . The compressor according to  claim 19 , wherein the pressure restoring passage is widened in the flowing direction of gas, the widening angle being less than or equal to 20 degrees.