Hydraulic diaphragm metering pump with diaphragm protection function

Abstract

The invention discloses a hydraulic diaphragm metering pump with a diaphragm protection function. The hydraulic diaphragm metering pump comprises a pump head, wherein a liquid inlet port, a liquid outlet port, a medium channel, a connection hole and a medium cavity are formed in the pump head; the liquid inlet port, the liquid outlet port, the medium channel, the connection hole and the medium cavity are communicated and form a T-shaped cavity; a diaphragm protection assembly is further arranged on the pump head; and the diaphragm protection assembly is internally arranged in the pump head andthe components of the diaphragm protection assembly are connected together. The pump head of the hydraulic diaphragm metering pump with the diaphragm protection function is remarkably improved in sealing performance compared with a pump head in the prior art. The diaphragm protection assembly is simple in structure, the components of the diaphragm protection assembly are integrally connected, andan integer can still be kept in any state; and in this way, the position relationship and the connection relationship among the components of the diaphragm protection assembly are quite stable, and then the whole diaphragm protection assembly is stable in working performance.

Description

technical field [0001] The invention relates to a metering pump, in particular to a hydraulic diaphragm metering pump with a protective film function. Background technique [0002] The metering pump is also called a quantitative pump or a proportional pump, which belongs to a reciprocating positive displacement pump. In the prior art, metering pumps are classified into: plunger, piston type; mechanical diaphragm type; hydraulic diaphragm type according to the overcurrent mode. Hydraulic diaphragm metering pump is composed of motor drive mechanism, hydraulic system, etc. The hydraulic system is composed of diaphragm, pump head and other components. The pump head is provided with a liquid inlet, a liquid outlet, a medium channel, a liquid discharge hole and a medium cavity; the diaphragm is connected at the place where the pump head is provided with the medium cavity. The hydraulic diaphragm metering pump in the prior art has some use defects: under high pressure conditions,...

AI Technical Summary

Problems solved by technology

There are some disadvantages in the use of hydraulic diaphragm metering pumps in the prior art: after the diaphragm contacts the part of the pump head corresponding to the medium cavity under high-pressure conditions, a raised plastic deformation will occur on the surface of the diaphragm corresponding to the small discharge hole of the pump head , affect the performance and life of the diaphragm, or even break it instantly; under abnormal working conditions, such as instantaneous overpressure, blockage of the liquid outlet, etc., the diaphragm will generate shear at the small discharge hole of the pump head medium cavity Damaged, causing metering pump failure

[0004] There is only a spring connected between the guide rod and the sealing screw. When the guide rod moves in the direction of the sealing screw, it will be limited by the spring, but when the guide rod moves in the opposite direction, it is finally blocked by the diaphragm, so the guide rod and the seal The connection relationship between the screws is very unstable, and the guide rod is easily detached from the spring

Because one end of the guide rod is embedded in the spring in this structure, the embedded connection between the guide rod and the spring can ensure that the stroke of the guide rod is at a normal value. If the guide rod and the spring are disconnected and connected again, it is very likely that the guide rod will not If it is normally embedded in the spring, the stroke of the guide rod will be much larger than the normal value, which will eventually cause the protective film device to fail to protect the diaphragm, greatly reducing the working stability of the protective film device

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