Reciprocating piston pump operating on pressure medium

Abstract

The present invention relates to a reciprocating piston pump comprising: at least one cylinder with an inlet for a pressure medium; a piston slidable in the cylinder between a first and a second position, and forming a pressure chamber in the cylinder; a first valve member which is received in the piston and which in an open position mutually connects the cylinder spaces on either side of the piston; a second valve member which is received in the piston and which in an open position connects a pressure medium passage formed in the piston to an outlet of the pump; a resilient member urging the piston in the first position; an actuating member connected to the valve members and which are embodied such that in the first position the first valve member is closed and the second valve member is opened and in the second position the first valve member is opened and the second valve member is closed, wherein the piston is moved to the second position by the pressure medium.

1 . A reciprocating piston pump comprising:
 a. at least one cylinder with an inlet for a pressure medium;   b. a piston slidable in the cylinder between a first and a second position, and forming a pressure chamber in the cylinder;   c. a first valve member which is received in the piston and which in an open position mutually connects the cylinder spaces on either side of the piston;   d. a second valve member which is received in the piston and which in an open position connects a pressure medium passage formed in the piston to an outlet of the pump;   e. a resilient member urging the piston in the first position;   f. actuating means which are connected to the valve members and which are embodied such that in the first position the first valve member is closed and the second valve member is opened and in the second position the first valve member is opened and the second valve member is closed, wherein the piston is moved to the second position by the pressure medium.   
   
   
       2 . Reciprocating piston pump according to  claim 1 , wherein the pressure medium fed at the pump inlet, in one stroke of the piston, moves the piston from a first position to a second position, wherein in said stroke the pressure medium in the pressure chamber is transported to the pump outlet. 
   
   
       3 . Reciprocating piston pump according to  claim 2 , wherein the pump comprising a first plunger for uptake of a first medium from a second inlet to a second chamber. 
   
   
       4 . Reciprocating piston pump according to  claim 3 , wherein the pump further comprises:
 a. a first sealing means for sealing the second chamber against a return flow of medium; and   b. a first connecting means for connecting the first plunger to the piston to simultaneously move the plunger and piston for transporting both the pressure medium and the first medium to the pump outlet.   
   
   
       5 . Reciprocating piston pump according to  claim 3  or  4 , wherein the pump comprising a second plunger for uptake of a second medium from a third inlet to a third chamber. 
   
   
       6 . Reciprocating piston pump according to  claim 5 , wherein the pump further comprises:
 a. second sealing means for sealing the third chamber against a return flow of medium; and   b. second connecting means for connecting the second plunger to the piston and to the first plunger to simultaneously move the piston, first and second plunger for transport of the pressure medium and first and second medium to the pump outlet.   
   
   
       7 . Reciprocating piston pump according to  claim 5  or  6 , wherein the pump comprises floating means for connecting the third inlet to the second chamber. 
   
   
       8 . Reciprocating piston pump according to  claim 7 , wherein the floating means comprising:
 a. pivoting means to keep the second pump inlet above the first inlet in the second medium; and   b. locking means for locking and unlocking the pivoting means.   c.   
   
   
       9 . A reciprocating piston pump according to  claim 1 , wherein the pump further comprises at least one shock absorber located in the piston with a plunger for smoothing the outflow of the pump. 
   
   
       10 . Reciprocating piston pump according to  claim 1 , wherein the pump further comprises disposing means for disposing an amount of an agent medium in at least one chamber. 
   
   
       11 . Reciprocating piston pump according to  claim 10 , wherein the pump comprising agent connecting means for connecting the volume of agent medium to the pump. 
   
   
       12 . Reciprocating piston pump according to  claim 1  wherein the pressure medium is a fluid. 
   
   
       13 . Reciprocating piston pump according to  claim 3  or  4 , wherein the ratio of the volume of the first and second chambers, or second and third chambers, is between 10 and 12. 
   
   
       14 . Reciprocating piston pump according to  claim 5  or  6 , wherein the ratios between the volume of the second and third pressure chambers is between 0.5 and 2.0. 
   
   
       15 . A Method for pumping at least one medium using a reciprocating piston pump, the method comprising:
 a. using a pressure medium to drive a piston in a cylinder, wherein movement of the piston varies the pressure inside a pressure chamber;   b. intaking a first medium through a first inlet by decreasing the pressure inside the pressure chamber, and   c. exhausting through a first outlet a mixture of the pressure medium and the first medium by increasing the pressure inside the pressure chamber.   
   
   
       16 . The method of  claim 15  further comprising:
 a. intaking a second medium through a second inlet by decreasing the pressure inside the pressure chamber, and   b. exhausting through the first outlet a mixture of the pressure medium, the first medium, and the second medium by increasing the pressure inside the pressure chamber.   
   
   
       17 . The method of  claim 15  wherein the pump is inserted into a tank containing the first medium and a lock member locks a float member to a pump body, wherein the first inlet is located on the float member, the method further comprising:
 a. Unlocking the lock member to release the float member,   b. The float member buoying upwards and pivoting to the upper surface of the first medium inside the tank, and   c. Intaking the first medium through the first inlet at the upper surface of the first medium inside the tank.   
   
   
       18 . The method of  claim 16  wherein the pump is inserted into a tank containing the first medium and the second medium, the first medium being less dense than the second medium, and wherein a lock member locks a float member to a pump body, wherein the first inlet is located on the float member and the second inlet is located on the pump body, the method further comprising:
 a. unlocking the lock member to release the float member,   b. the float member buoying upwards and pivoting to the upper surface of the first medium inside the tank,   c. intaking the first medium through the first inlet at the upper surface of the first medium inside the tank, and   d. intaking the second medium through the second inlet below the interface between the first medium and the second medium inside the tank.