High-pressure generation device

Abstract

The high-pressure generation device ( 110 ) comprises three pressure chambers which pressurize liquid drawn from the outside through the pumping operation of a plurality of pistons ( 1 ) having different outer diameters, pressurizes the liquid drawn from the outside, and discharges the liquid pressurized to a constant pressure to the outside in each reciprocating operation of the plurality of pistons ( 1 ). The three pressure chambers comprising a first pressure chamber ( 31 ) which draws liquid from the outside, a second pressure chamber ( 32 ) of which the pressurizing area for pressurizing the liquid is smaller than that of the first pressure chamber ( 31 ), and a third pressure chamber ( 33 ) of which the pressurizing area is smaller than that of the second pressure chamber ( 32 ) and which discharges liquid to the outside. The pressurizing areas of the second pressure chamber ( 32 ) and the third pressure chamber ( 33 ) are set so that the ratio of the difference between the pressurizing areas of the second pressure chamber ( 32 ) and the third pressure chamber ( 33 ) to the thrust when the plurality of pistons move in the one direction is equal to the ratio of the pressurizing area of the third pressure chamber ( 33 ) to the thrust when the plurality of pistons move in the other direction.

1 . A high-pressure generation device comprising:
 a plurality of reciprocating pistons which are coaxially connected to a reciprocating drive shaft of a drive unit and have different outer diameters and three pressure chambers which pressurize liquid drawn from the outside through the pumping operation of the plurality of pistons, pressurizes liquid drawn from the outside, and discharges liquid pressurized to a constant pressure to the outside in each reciprocating operation of the plurality of pistons, wherein the three pressure chambers comprising a first pressure chamber for drawing liquid from the outside, a second pressure chamber of which the pressurizing area for pressurizing liquid is smaller than that of the first pressure chamber, and a third pressure chamber of which the pressurizing area is smaller than that of the second pressure chamber and which discharges liquid to the outside, and the pressurizing areas of the second pressure chamber and the third pressure chamber are set so that the ratio of the difference between the pressurizing areas of the second pressure chamber and the third pressure chamber to the thrust when the plurality of pistons move in the one direction is equal to the ratio of the pressurizing area of the third pressure chamber to the thrust when the plurality of pistons move in the other direction, or the direction opposite to the one direction.   
   
   
       2 . The high-pressure generation device as claimed in  claim 1 , wherein the drive shaft is reciprocated by a drive unit having a rotating shaft, and the pressurizing area of the second pressure chamber is set to be twice as large as the pressurizing area of the third pressure chamber. 
   
   
       3 . The high-pressure generation device as claimed in  claim 1  or  2 , comprising an auxiliary chamber which communicates with the first pressure chamber or the second pressure chamber, wherein the volume of the auxiliary chamber is adjustable. 
   
   
       4 . The high-pressure generation device as claimed in  claim 1  or  2 , comprising: an intake port for drawing liquid from the outside; a first flow passage allowing the liquid drawn from the intake port to flow into the first pressure chamber; a second flow passage allowing the liquid pressurized by the first pressure chamber to flow into the second pressure chamber; a third flow passage allowing the liquid pressurized to a predetermined pressure to flow into the third pressure chamber; and an outlet port for discharging the liquid pressurized to a constant pressure from the third pressure chamber to the outside, wherein each of the first flow passage, the second flow passage, and the third flow passage is provided with a backflow prevention device allowing liquid to flow only in a predetermined direction. 
   
   
       5 . The high-pressure generation device as claimed in  claim 4 , wherein when the plurality of pistons move in the one direction, both the first pressure chamber and the third pressure chamber increase in volume, opening the backflow prevention devices of both the first flow passage and the third flow passage, and the second pressure chamber decreases in volume, closing the backflow prevention device of the second flow passage, thereby allowing the liquid pressurized to a constant pressure to be discharged from the outlet port. 
   
   
       6 . The high-pressure generation device as claimed in  claim 4 , wherein when the plurality of pistons move in the other direction, both the first pressure chamber and the third pressure chamber decrease in volume, closing the backflow prevention devices of both the first flow passage and the third flow passage, and the second pressure chamber increases in volume, opening the backflow prevention device of the second flow passage, thereby allowing the liquid pressurized to a constant pressure to be discharged from the outlet port. 
   
   
       7 . The high-pressure generation device as claimed in  claim 4 , wherein any of the first flow passage, the second flow passage, and the third flow passage is formed outside the plurality of pistons. 
   
   
       8 . The high-pressure generation device as claimed in  claim 4 , wherein the third pressure chamber is formed at the tip of a piston of which the outer diameter is smallest out of the plurality of pistons, the third flow passage is formed within the plurality of pistons, and both the first flow passage and the second flow passage are formed outside the plurality of pistons.