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A dispensing pump, and more particularly, a valve impact type dispensing pump that may be used in a process of manufacturing an electronic product and may dispense an accurate amount of a liquid, such as a liquid synthetic resin, at high speed. The present invention provides a valve impact type disp

A dispensing pump, and more particularly, a valve impact type dispensing pump that may be used in a process of manufacturing an electronic product and may dispense an accurate amount of a liquid, such as a liquid synthetic resin, at high speed. The present invention provides a valve impact type dispensing pump that can descend a valve rod at high speed and thus can dispense a liquid with high viscosity at high speed. The valve impact type dispensing pump can dispense an accurate amount of a liquid at high speed. Also, the valve impact type dispensing pump can dispense a liquid having high viscosity at high speed due to a fast descending speed of a valve rod.

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1. A liquid dispensing pump comprising: a pump body;a valve body comprising an inlet path to which liquid is supplied, a reservoir in which the liquid supplied via the inlet path is to be stored, and a discharge path through which the liquid stored in the reservoir is discharged, the valve body bein

1. A liquid dispensing pump comprising: a pump body;a valve body comprising an inlet path to which liquid is supplied, a reservoir in which the liquid supplied via the inlet path is to be stored, and a discharge path through which the liquid stored in the reservoir is discharged, the valve body being installed at the pump body;a valve rod configured to pressurize the liquid stored in the reservoir of the valve body so that the liquid is discharged via the discharge path;an operating rod connected to the valve rod and configured to drive the valve rod to move relative to the valve body while permitting the valve rod to move relative to the operating rod within a predetermined gap distance in a lengthwise direction of the valve rod;a cam member comprising a through hole through which the operating rod passes and cam protrusions formed around the through hole, the cam member having inclined surfaces on which a cam follower travels, the cam member being installed at the pump body and rotatable about a rotation axis;the cam follower comprising rollers configured to roll on the inclined surfaces of the cam protrusions when the cam member rotates, the cam follower coupled to the operating rod and configured to drive the valve rod to move relative to the valve body;an elastic member installed between the pump body and the cam follower and configured to exert an elastic force onto the cam follower toward the cam member; anda gap member interconnecting the valve rod and the operating rod while permitting the valve rod to move relative to the operating rod within the gap distance,wherein the valve rod comprises a hanging protrusion, wherein the gap member comprises a hanging groove in which the hanging protrusion is received, wherein the hanging groove is sized to provide the gap distance for the movement of the hanging protrusion within the hanging groove relative to the gap member. 2. The pump of claim 1, wherein the gap distance is smaller than the height of the cam protrusions of the cam member. 3. The pump of claim 1, wherein the hanging protrusion is movable within the hanging groove of the gap member in the lengthwise direction of the valve rod. 4. A liquid dispensing pump comprising: a pump body;a valve body comprising an inlet path to which liquid is supplied, a reservoir in which the liquid supplied via the inlet path is to be stored, and a discharge path through which the liquid stored in the reservoir is discharged, the valve body being installed at the pump body;a valve rod configured to pressurize the liquid stored in the reservoir of the valve body so that the liquid is discharged via the discharge path;an operating rod connected to the valve rod and configured to drive the valve rod to move relative to the valve body while permitting the valve rod to move relative to the operating rod within a predetermined gap distance in a lengthwise direction of the valve rod;a cam member comprising a through hole through which the operating rod passes and cam protrusions formed around the through hole, the cam member having inclined surfaces on which a cam follower travels, the cam member being installed at the pump body and rotatable about a rotation axis;the cam follower comprising rollers configured to roll on the inclined surfaces of the cam protrusions when the cam member rotates, the cam follower coupled to the operating rod and configured to drive the valve rod to move relative to the valve body;an elastic member installed between the pump body and the cam follower and configured to exert an elastic force onto the cam follower toward the cam member; anda gap member interconnecting the valve rod and the operating rod while permitting the valve rod to move relative to the operation rod within the gap distance,wherein the gap member comprises an upper member that is coupled to the operating rod, and a lower member that is screw-coupled to the upper member so that the gap distance is adjustable, wherein the lower member is coupled to the upper member while permitting the motion of the valve rod in the lengthwise direction of the valve rod relative to the operating rod. 5. A liquid dispensing pump comprising: a pump body;a valve body comprising an inlet path to which liquid is supplied, a reservoir in which the liquid supplied via the inlet path is to be stored, and a discharge path through which the liquid stored in the reservoir is discharged, the valve body being installed at the pump body;a valve rod configured to pressurize the liquid stored in the reservoir of the valve body so that the liquid is discharged via the discharge path;an operating rod connected to the valve rod and configured to drive the valve rod to move relative to the valve body while permitting the valve rod to move relative to the operating rod within a predetermined gap distance in a lengthwise direction of the valve rod;a cam member comprising a through hole through which the operating rod passes and cam protrusions formed around the through hole, the cam member having inclined surfaces on which a cam follower travels, the cam member being installed at the pump body and rotatable about a rotation axis;the cam follower comprising rollers configured to roll on the inclined surfaces of the cam protrusions when the cam member rotates, the cam follower coupled to the operating rod and configured to drive the valve rod to move relative to the valve body;an elastic member installed between the pump body and the cam follower and configured to exert an elastic force onto the cam follower toward the cam member; anda gap member interconnecting the valve rod and the operating rod while permitting the valve rod to move relative to the operating rod within the gap distance,wherein the gap member comprises a lower member that is coupled to the valve rod, and an upper member that is screw-coupled to the lower member so that the gap distance is adjustable, wherein the upper member is coupled to the lower member while permitting the motion of the operating rod in a lengthwise direction of the operating rod relative to the valve rod. 6. The pump of claim 1, wherein the cam protrusions of the cam member are arranged at the same angle intervals. 7. The pump of claim 1, wherein the cam member comprises an even number of cam protrusions, and the cam follower comprises two rollers at intervals of 180 degrees. 8. The pump of claim 1, wherein each of the cam protrusions of the cam member comprises the inclined surface ascending along a circumferential direction of the cam member at constant inclination, and further comprises another surface descending parallel to the rotation axis of the cam member. 9. The pump of claim 1, further comprising a rotating unit which is configured to rotate the cam member and comprises a driven pulley connected to the cam member to rotate the cam member, a driving pulley installed at the pump body, a belt connecting the driving pulley and the driven pulley, and a motor configured to rotate the driving pulley.