Piston pump with first opening and first closing sealing structure

Abstract

The invention discloses a piston pump with a first opening and first closing sealing structure. The piston pump comprises a piston barrel shell, wherein a cavity is formed in the piston barrel shell,a sealing assembly and a piston assembly are arranged in the cavity, a driving piece is further arranged in the cavity, the driving part can drive the sealing assembly to move to the limiting positionfirst, and then drive the piston assembly to move. According to the piston pump, the obvious hysteresis of the deformation due to a material of a check valve made of an elastic material is overcome,so that before suction operation by the piston pump, a suction inlet is in an open state, and an exhaust outlet is in a closed state; and before exhaust operation by the piston pump, the suction inletis in a closed state and the exhaust outlet is in an open state. The efficiency loss of the piston pump due to the hysteresis of the check valve is reduced or even eliminated so that the piston pumpcan run at a higher speed.

Description

technical field [0001] The invention relates to a piston pump, in particular to a piston pump with a first-open first-close sealing structure. Background technique [0002] The structure of a traditional piston pump includes: a piston driving rod, a piston, and a piston cylinder. The piston cylinder is provided with a suction port and a discharge port, and a valve structure is provided at the suction port and discharge port of the piston cylinder. During the process, the channel of the suction port is in an open state, and the channel of the discharge port is in a closed state; in the process of discharging the medium of the piston pump, the channel of the discharge port is in an open state, and the channel of the suction port is in a closed state; in this way, the suction can be completed media manipulation. The valve structure of the suction port and the discharge port of the existing piston pump is generally a one-way valve of elastic material, and its working principle ...

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Problems solved by technology

[0003] However, due to the material of the one-way valve of elastic material, its deformation has obvious hysteresis, that is, at the last moment when the piston pump completes the operation of inhaling the medium, the one-way valve of the suction port is in an open state; The one-way valve is in the closed state; the piston will immediately enter the process of discharging the medium under the action of the drive rod, but because the closing and opening of the one-way valve is completed by its own deformation, the one-way valve of the suction port changes from open to It takes time to complete the transition from closing to opening of the one-way valve of the discharge port, and it cannot enter the corresponding state immediately. This is the hysteresis of the one-way valve. Due to the existence of such a hysteresis, the piston pump never When the suction state enters the discharge state, the one-way valve at the suction port is still open for a short period of time, and the one-way valve at the discharge port is still closed, that is, when the piston compresses the medium, a part of the medium will flow along the suction port. It also flows into the outside of the suction end, resulting in efficiency loss. Such efficiency loss will be more obvious when the driving speed of the piston driving rod is faster, thus restricting the efficiency of the high-speed operation of the piston pump.

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