Plunger pump and hematology analyzer with plunger pump

Abstract

The invention provides a plunger pump and a hematology analyzer with the plunger pump. The plunger pump comprises a base, and a screw component and a pump body component arranged on the base, wherein the screw component comprises a power element, a screw driven by the power element to act and a driving nut arranged on the screw; the pump body comprises a negative pressure pump body and a piston which reciprocate along the negative pressure pump body so as to provide positive pressure or negative pressure; the piston is connected with the driving nut and is driven by the driving nut to do reciprocating motion; and the piston is directly connected with the driving nut through the plunger pump and the hematology analyzer with the plunger pump, so that the piston can do reciprocating motion in the negative pump body through the driving of the driving nut so as to provide the positive pressure or negative pressure according to needs; a complex and large transmission mechanism is not needed, so that the structure is simplified; and the screw component stability is high, the high-precision positioning can be performed in the movement process, and the high-precision transmission is realized.

Description

technical field [0001] The invention relates to a medical device, in particular to a blood cell analyzer and a plunger pump of the blood cell analyzer. Background technique [0002] In the existing blood cell analyzers, the plunger pump is generally driven by a gear and a rack. Because it is difficult to precisely position the rack, the transmission accuracy is not high, and the rack shakes greatly during the movement, making the transmission unstable. , The wear between the piston and the sealing ring is serious; it seriously affects the performance and service life of the plunger pump. [0003] In addition, there is another transmission mode that adopts screw rod and synchronous belt transmission. In this transmission mode, the belt is very easy to slip and cause out-of-step phenomenon, and multiple motors need to be set for driving, which increases the manufacturing cost. Moreover, the existing syringe adopts a single sampling method, which cannot be flexibly sampled acc...

AI Technical Summary

Problems solved by technology

[0002] In the existing blood cell analyzers, the plunger pump is generally driven by a gear and a rack. Because it is difficult to precisely position the rack, the transmission accuracy is not high, and the rack shakes greatly during the movement, making the transmission unstable. , the wear between the piston and the sealing ring is serious; it seriously affects the performance and service life of the plunger pump

[0003] There is also another transmission method that uses screw and synchronous belt transmission. In this transmission method, the belt is very easy to slip and cause out-of-step phenomena, and multiple motors need to be installed for driving, which increases the manufacturing cost.

Moreover, the existing syringe adopts a single sampling method, which cannot be flexibly sampled according to the sampling requirements, resulting in unnecessary waste

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