Fluid pump and fluid machine

Abstract

A fluid pump includes a driving part, a movable part that is movable by power transmitted from the driving part via a transmission part, a fixed part disposed on a side of the movable part, opposite to the transmission part, to form an operating chamber having an outlet from which a fluid flowing into the operating chamber is pressure-fed to an outside in a liquid state by the movable part, and an introduction passage for introducing a part of the fluid in the operating chamber to the transmission part. Accordingly, the liquid fluid can be introduced to the transmission part such as a bearing through the introduction passage.

1 . A fluid pump comprising: 
 a driving part;    a movable part that is movable by power transmitted from the driving part;    a transmission part through which the power from the driving part is transmitted to the movable part;    a fixed part disposed on a side of the movable part, opposite to the transmission part, to form an operating chamber having an outlet from which a fluid flowing into the operating chamber is pressure-fed to an outside in a liquid state by the movable part; and    an introduction passage for introducing a part of the fluid in the operating chamber to the transmission part.    
   
   
       2 . The fluid pump according to  claim 1 , wherein: 
 the introduction passage is provided in the movable part; and    the introduction passage has an opening part opened to the operating chamber to be tapered.    
   
   
       3 . The fluid pump according to  claim 1 , wherein: 
 the movable part includes a passage part for defining the introduction passage; and    the passage part is a member separate from the movable part.    
   
   
       4 . The fluid pump according to  claim 1 , wherein: 
 the movable part is a movable scroll having a base plate portion and a first wall portion protruding from the base plate portion in a spiral shape;    the fixed part is a fixed scroll having a spiral second wall portion engaged with the first wall portion; and    the introduction passage has a diameter smaller than a predetermined value, and is provided in the base plate portion of the movable scroll to make the operating chamber communicate with the transmission part at a predetermined pressure loss.    
   
   
       5 . The fluid pump according to  claim 4 , wherein: 
 the transmission part is housed in a closed space; and    the movable scroll receives a back pressure applied thereto on a side of the fixed scroll by the fluid introduced into the closed space.    
   
   
       6 . The fluid pump according to  claim 5 , wherein: 
 the movable scroll has a plurality of holes, each having a diameter smaller than a predetermined value, for adjusting pressure between the operating chamber and the closed space.    
   
   
       7 . The fluid pump according to  claim 1 , wherein: 
 the movable part is a rotor that is made to revolve by the driving part arranged in a center of the movable part;    the fixed part is a cylinder housing in which a cylinder housing the rotor is disposed; and    the introduction passage is a passage having a diameter smaller than a predetermined value, and is provided in the rotor to make the operating chamber communicate with the transmission part at a predetermined pressure loss.    
   
   
       8 . The fluid pump according to  claim 1 , wherein: 
 the movable part is a rotor that is revolve by the driving part arranged in a center of the movable part;    the fixed part is a cylinder housing in which a cylinder housing the rotor is disposed; and    the introduction passage is a groove that is provided on an end surface in an axial direction of the rotor and makes the operating chamber communicate with the transmission part at a predetermined pressure loss.    
   
   
       9 . A fluid machine comprising: 
 an expansion member having a function of outputting mechanical energy by expansion of refrigerant, the expansion member having a low-pressure port from which low-pressure vapor-phase refrigerant after being decompressed flows out and a high-pressure port from which high-pressure refrigerant before being decompressed flows in;    an electric power generating member having a function of generating electric power by using the mechanical energy;    a refrigerant pressure-feeding member for pressure-feeding refrigerant to the expansion member, the refrigerant pressure-feeding member having a refrigerant suction port from which liquid-phase refrigerant is sucked and a refrigerant discharge port from which liquid-phase refrigerant is discharged; and    a communication part for making the low-pressure port of the expansion member communicate with the refrigerant suction port of the refrigerant pressure-feeding member, wherein the communication part separates lubricating oil from vapor-phase refrigerant and supplies the lubricating oil to the refrigerant suction port.    
   
   
       10 . The fluid machine according to  claim 9 , further comprising 
 a housing which houses all of the expansion member, the electric power generating member and the refrigerant pressure-feeding member.    
   
   
       11 . The fluid machine according to  claim 9 , wherein the low-pressure port is arranged above the refrigerant suction port.  
   
   
       12 . The fluid machine according to  claim 9 , wherein: 
 the expansion member having the low-pressure port that is arranged above the electric power generating member; and    the refrigerant pressure-feeding member having the refrigerant suction port is arranged below the electric power generating member.    
   
   
       13 . The fluid machine according to  claim 9 , wherein: 
 the communication part separates the oil from the vapor-phase refrigerant by gravity by the use of a difference in specific gravity between the vapor-phase refrigerant and the oil and includes an oil storing part for storing the separated oil.    
   
   
       14 . The fluid machine according to  claim 13 , wherein the oil storing part is provided in the electric power generating member.  
   
   
       15 . The fluid machine according to  claim 9 , wherein the communication part has a check valve for preventing the liquid-phase refrigerant from flowing back from the refrigerant suction port to the low-pressure port.  
   
   
       16 . The fluid machine according to  claim 15 , wherein: 
 the communication part has a throttle mechanism connected in series to the check valve; and    the throttle mechanism has a refrigerant passage area smaller than a refrigerant passage area of the check valve.    
   
   
       17 . The fluid machine according to  claim 9 , further comprising 
 a transmission part for transmitting driving power from the expansion member to the refrigerant pressure-feeding member, wherein the refrigerant pressure-feeding member is operated by the driving power from the expansion member.    
   
   
       18 . The fluid machine according to  claim 17 , wherein the transmission part is a one-way clutch that transmits the mechanical energy as the driving power from the expansion member only when the expansion member outputs the mechanical energy.  
   
   
       19 . The fluid machine according to  claim 9 , wherein: 
 the expansion member is a compression and expansion member that has a function of compressing refrigerant by driving power applied thereto;    the electric power generating member is a driving and electric-power generating member that applies the driving power to the compression and expansion member; and    when the compression and expansion member compresses refrigerant, the low-pressure port sucks low-pressure vapor-phase refrigerant after being decompressed and the high-pressure port discharges high-pressure refrigerant before being decompressed.    
   
   
       20 . A fluid machine comprising: 
 an expansion member having a function of outputting mechanical energy by expansion of refrigerant;    a refrigerant pressure-feeding member for pressure-feeding refrigerant to the expansion member, the expansion member having a low-pressure port from which low-pressure vapor-phase refrigerant after being decompressed flows out and a high-pressure port from which high-pressure refrigerant after being decompressed flows in; and    a communication part that introduces oil contained in refrigerant flowing out from the low-pressure port to a sliding part of the refrigerant pressure-feeding member.    
   
   
       21 . A vapor compression type refrigerator combined with a Rankine cycle, comprising: 
 a compression and expansion member that has a function of compressing and discharging refrigerant by driving power applied thereto and a function of outputting mechanical energy by expansion of refrigerant, the compression and expansion member having a low-pressure port from which low-pressure refrigerant after being decompressed is sucked and flows out and a high-pressure port from which high-pressure refrigerant before being decompressed is discharged and flows in;    a driving and electric-power generating member that has a function of applying the driving power to the compression and expansion member and a function of generating electric power by the mechanical energy;    a refrigerant pressure-feeding member that pressure-feeds refrigerant to the compression and expansion member, the refrigerant pressure-feeding member having a refrigerant suction port from which liquid-phase refrigerant is sucked and a refrigerant discharge port from which liquid-phase refrigerant is discharged; and    a communication part that makes the low-pressure port communicate with the refrigerant suction port, wherein the communication part separates lubricating oil from the vapor-phase refrigerant and supplying the lubricating oil to the refrigerant suction port.    
   
   
       22 . A vapor compression type refrigerator combined with a Rankine cycle, comprising: 
 a compression and expansion member that has a function of compressing and discharging refrigerant by driving power applied thereto and a function of outputting mechanical energy by expansion of refrigerant, the compression and expansion member having a low-pressure port from which low-pressure refrigerant after being decompressed is sucked and flows out and a high-pressure port from which high-pressure refrigerant before being decompressed is discharged and flows in;    a driving and electric-power generating member that has a function of applying the driving power to the compression and expansion member and a function of generating electric power by the mechanical energy;    a refrigerant pressure-feeding member that pressure-feeds refrigerant to the compression and expansion member, the refrigerant pressure-feeding member having a refrigerant suction side and a mechanical sliding portion;    a first communicating part through which the refrigerant suction side of the refrigerant pressure-feeding member communicates with the mechanical sliding portion of the refrigerant pressure-feeding member; and    a second communication part that makes the low-pressure port communicate with the mechanical sliding portion, wherein the second communication part separates lubricating oil from the vapor-phase refrigerant and supplying the lubricating oil to the mechanical sliding portion.