Plunger metering pump with buffering device and back pressure device

Abstract

The invention relates to the technical field of metering pumps, in particular to a plunger metering pump with a buffering device and a back pressure device. The plunger metering pump with the buffering device and the back pressure device comprises a pump head, the buffering device installed on the pump head, the back pressure device and a plunger assembly, wherein the center of the pump head is provided with a medium flow channel and a valve bank hole running through the top of the pump head, the buffering device communicates with the medium flow channel and used for smoothing pulsation of a medium pipeline to achieve buffering of a medium in the medium pipeline, the back pressure device is installed at a pump outlet of the buffering device and used for increasing the pressure of the medium at the pump outlet, the side, far away from the buffering device, of the pump head is provided with a through hole communicating with the valve blank hole and the plunger assembly, the plunger assembly conducts reciprocating movement to change the volume of the pump cavity to achieve liquid suction and liquid discharge. The plunger metering pump with the buffering device and the back pressure device has the beneficial effects of being compact in structure, convenient to install, good in pulse eliminating effect and capable of avoiding a siphon phenomenon.

Description

technical field [0001] The invention relates to the technical field of metering pumps, in particular to a plunger metering pump with a buffer device and a back pressure device. Background technique [0002] The pulsation damper and the back pressure valve are necessary accessories for the metering pump. The pulsation damper is a kind of accumulator. It can smooth the pipeline pulsation through the change of the volume of the air chamber, which can eliminate the vibration of the pipeline, reduce the pressure pulsation, reduce the Small flow floats to protect downstream instruments and equipment; Back Pressure refers to the pressure at the rear end, and is usually used to describe the pressure opposite to the flow direction of the fluid discharged from the system at the outlet or on the secondary side; back pressure The valve is installed on the outlet pipeline of the metering pump to increase the outlet resistance of the pump, increase the outlet pressure of the pump, and mak...

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Problems solved by technology

[0003] Disadvantages of pulsation dampers and back pressure valves on the market: the pulsation dampers and back pressure valves are independently installed on the outlet pipeline of the metering pump, the volume is large and the installation location is required, and the installation is cumbersome; some users install the pulsation damper at will, The pulsation damper is far away from the outlet of the metering pump, which violates the principle that the closer the pulsation damper is installed to the outlet of the metering pump, the better, so that the effect of eliminating the pulse is greatly reduced; the air-type pulse damper can eliminate the pulse, but Compared with the diaphragm pulse damper, it is relatively large in size, and the effect of eliminating pulses is not good.

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