Composite fluid machine

Abstract

A composite fluid machine has a first and a second fluid delivering mechanisms. The first fluid delivering mechanism includes an accommodation chamber, a movable body, and a suction space. The movable body is accommodated in the accommodation chamber.. The suction space is defined by the accommodation chamber and the movable body. The suction space is connected to the inlet, and the flow rate of the fluid introduced into the suction space is displaced. The movable body performs a suction movement and a discharge movement.. The second fluid delivering mechanism is combined with the first fluid delivering mechanism and is located upstream of the first fluid delivering mechanism to deliver the fluid to the suction space of the first fluid delivering mechanism.. Lobes of helical roots rotors are twisted in a respective direction around the rotational axis.

1 . A composite fluid machine having a first and a second fluid delivering mechanisms,
 the first fluid delivering mechanism comprising:
 an accommodation chamber; 
 a movable body being accommodated in the accommodation chamber; 
 a suction space defined by the accommodation chamber and the movable body, wherein the suction space is connected to an inlet, wherein the flow rate of the fluid introduced into the suction space is displaced; 
 wherein the movable body performs a suction movement to introduce the fluid into the suction space, and the movable body performs a discharge movement to discharge the fluid out from the accommodation chamber; and the second fluid delivering mechanism which is combined with the first delivering mechanism so as to be located upstream of the first fluid delivering mechanism to deliver the fluid to the suction space of the first fluid delivering mechanism, the second fluid delivering mechanism comprising: 
 a roots rotor housing; 
 a pair of helical roots rotors having a respective rotational axis and plural lobes around the rotational axis, wherein the lobes are engaged with each other when the helical roots rotors rotate in the roots rotor housing, wherein the lobes are in a helical shape in such a manner that the lobes are twisted in a respective direction around the rotational axis 
   
   
   
       2 . The composite fluid machine according to  claim 1 , wherein the movable body of the first fluid delivering mechanism is formed by a pair of rotors which engage with each other while rotating in the accommodation chamber to introduce the fluid into the suction space and to discharge the fluid out from the accommodation chamber. 
   
   
       3 . The composite fluid machine according to  claim 2 , further comprising:
 a drive shaft being connected to one of the pair of the rotors for the first fluid delivering mechanism, wherein the drive shaft is connected to one of the pair of the helical roots rotors for the second fluid delivering mechanism; and   a driven shaft being connected to the other of the pair of the rotors for the first fluid delivering mechanism, wherein the driven shaft is connected to the other of the pair of the helical roots rotors for the second fluid delivering mechanism.   
   
   
       4 . The composite fluid machine according to  claim 1 , further comprising:
 a drive shaft being connected to the movable body of the first fluid delivering mechanism, wherein the drive shaft is connected to one of the pair of the helical roots rotors for the second fluid delivering mechanism.   
   
   
       5 . The composite fluid machine according to  claim 1 , wherein the first fluid delivering mechanism has a pair of screw rotors as the movable body which engage with each other while rotating in the accommodation chamber. 
   
   
       6 . The composite fluid machine according to  claim 1 , wherein the accommodation chamber of he first fluid delivering mechanism is formed in a fixed scroll, and wherein a movable scroll as the movable body performs an orbital movement in the accommodation chamber while engaging with the fixed scroll. 
   
   
       7 . The composite fluid machine according to  claim 1 , wherein the first fluid delivering mechanism comprising:
 a rotor chamber as the accommodation chamber;   a rotor as the movable body being accommodated in the rotor chamber, wherein the rotor has plural slots; and   plural vanes being inserted in the slots; wherein the vanes, the rotor defines the suction space in the rotor chamber.   
   
   
       8 . The composite fluid machine according to  claim 1 , wherein the lobes of the second fluid delivering mechanism have a twist angle Φ which is set so as to satisfy the following equation.:
   Φ=(360°/2 n ) X,      where n is the number of the lobes and X is a positive integer.   
   
   
       9 . The composite fluid machine according to  claim 1 , wherein the first fluid delivering mechanism compresses the fluid in the accommodation chamber.