Hydraulic drive pulsator of reciprocating action

Claim 2

A hydraulic drive pulsator with actuating mechanism and reciprocating action, comprising: a housing with a cavity filled with liquid, a cylinder adjacent to the said housing; a cavity in the said cylinder communicating with the cavity of the said housing; a spring-loaded piston located in the cavity of the said cylinder and separating said cylinder from the space of said housing; a driving shaft of the said pulsator located in the cavity of the said housing; an eccentric fastened to the said driving shaft, said piston being set in reciprocating motion by the said eccentric; an axial hole bored in the said spring-loaded piston; a third chamber of said actuating mechanism with a device for compensating for the leakage of the liquid therefrom and for protecting said third chamber against overload pressure, said device comprising: a spring-loaded valve built into said hole of said piston so that during the operating stroke of the said piston said valve is brought into contact with said piston, said device while compensating for the leakage of liquid from the said third chamber or increasing the pressure therein, forming with said piston a clearance for the liquid to pass, the effective area of the said piston being smaller than the area confined by the line of its contact with said valve.

Claim 3

A hydraulic drive pulsator with actuating mechanism and reciprocating action, according to claim 1, wherein the ratio between the effective area of said piston and the area confined by the line of its contact with said valve is maintained in the range of 0.99 -0.66.

Claim 4

A hydraulic drive pulsator with actuating mechanism and reciprocating action, according to claim 1, wherein said spring-loaded valve includes a limiter restricting its movement with respect to the piston, said limiter being in the form of a pin installed in a hole bored in said valve perpendicular to its axis and moving in slots in the walls of said piston parallel to its generatrix.

Claim 5

A hydraulic drive pulsator with actuating mechanism and reciprocating action, comprising: a housing with a cavity filled with liquid, a cylinder connected to said housing; a cavity in the said cylinder communicating with the cavity of the said housing; a spring-loaded piston located in the cavity of the said cylinder and separating said cylinder cavity from the cavity of said housing; a driving shaft of the said pulsator located in the cavity of the said housing, an eccentric fastened to the said driving shaft for contacting said piston during rotary motion of said driving shaft, said piston being set in reciprocating motion by periodic contact from said eccentric when rotated by said shaft, an axial stepwise hole in the said spring-loaded piston having maximum, minimum and intermediate cross-sectional areas; a chamber of said actuating mechanism with a device for compensating for the leakage of the liquid therefrom and for protecting said chamber against overload pressure, said device comprising: a valve in said hole of said piston and within the maximum cross-sectional area for reciprocating along the piston axis; a spring in said hole in said piston within the intermediate cross-sectional area and abutting with one end against said valve, the other end of said spring abutting against the step of the hole between the intermediate and minimum cross-sectional areas, respectively said step being formed by the surface between said intermediate and minimum cross-sectional areas; said valve having on its end face, on the side facing said step of said hole between the maximum and the intermediate cross-sectional areas, an annular projection contacting the plane of said step; said piston having an effective area smaller than that of said valve and limited by the line of contact between its annular projection and said step of said hole in said piston.

Claim 6

A hydraulic drive pulsator with actuating mechanism and reciprocating action, comprising: a housing with a cavity filled with liquid, a cylinder connected to said housing; a cavity in the said cylinder communicating with the cavity of the said housing; a spring-loaded piston located in the cavity of the said cylinder and separating said cylinder cavity from the cavity of said housing; a driving shaft of the said pulsator located in the cavity of the said housing, an eccentric fastened to the said driving shaft for contacting said piston during rotary motion of said driving shaft, said piston being set in reciprocating motion by periodic contact from said eccentric when rotated by said shaft, an axial stepwise hole in the said spring-loaded piston having maximum, minimum and intermediate cross-sectional areas; a chamber of said actuating mechanism with a device for compensating for the leakage of the liquid therefrom and for protecting said chamber against overload pressure, said device comprising: a valve in said hole of said piston and within the maximum cross-sectional area for reciprocating along the piston axis; a spring in said hole in said piston within the intermediate cross-sectional area and abutting with one end against said valve, the other end of said spring abutting against the step of the hole between the intermediate and minimum cross-sectional areas, respectively said step being formed by the surface between said intermediate and minimum cross-sectional areas; said valve having on its end face, on the side facing said step of said hole between the maximum and the intermediate cross-sectional areas, an annular projection contacting the plane of said step; said piston having an effective area smaller than that of said valve and limited by the line of contact between its annular projection and said step of said hole in said piston.