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High-pressure constant flow pump for single lobe of liquid chromatograph

A high-pressure constant-flow pump and liquid chromatography technology, applied in the field of single-cam high-pressure constant-flow pumps for liquid chromatography, can solve the problem of affecting sample detection results, output pressure fluctuations of high-pressure constant-flow pumps, and limiting the development and application of liquid chromatography and other problems, to achieve the effect of accurate product quality inspection results, continuous and automatic work, and small fluctuations

Inactive Publication Date: 2009-12-16
SHANGHAI SUNNY HENGPING SCI INSTR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is a long-term difficult technical problem in the existing liquid chromatograph: the output pressure fluctuation of the high-pressure constant flow pump affects the test results of the sample.
This technical problem has existed for a long time at home and abroad, which limits the development and application of liquid chromatography.

Method used

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  • High-pressure constant flow pump for single lobe of liquid chromatograph

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Embodiment Construction

[0025] The present invention will be further described through specific embodiments below in conjunction with the accompanying drawings.

[0026] Single-cam high-pressure constant-flow pump for liquid chromatography consists of stepping motor (1), timing belt (3), bearing (5), worm (6), worm gear (7), worm gear shaft (8), and cam (9) , a plunger rod (10), and a pump body (12). The power of the stepping motor (1) is W, and the output shaft of the stepping motor (1) drives the synchronous pulley (2) to rotate. The synchronous pulley (2) is connected with a drive belt (3), and the drive belt (3) drives the driven synchronous pulley (4) to rotate. The driven synchronous belt pulley (4) drives the worm screw (6) and the worm wheel (7) to rotate; the worm screw (6) and the worm wheel (7) cooperate with each other, and the worm wheel shaft (8) rotates with the worm wheel (7). The two ends of the worm shaft (8) are provided with bearings (5); the end surface of the worm shaft (8) is...

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Abstract

The invention belongs to the analytical instrument, and discloses a high-pressure constant flow pump for a single lobe of a liquid phase chromatograph. Output pressure of the prior high-pressure constant flow pump of the liquid phase chromatograph fluctuates to influence the test result of samples. A step motor (1) of the invention drives a worm (6) and a worm wheel (7) to rotate through a synchronous belt (3); an end face of a worm-wheel shaft (8) is provided with a lobe (9); a curve line on the lobe (9) pushes two bilaterally symmetrical plunger rods (10) to move back and forth; a spring (13) is arranged in a pump body (12), and elasticity of the spring (13) pushes the plunger rods (10) to move back; and a liquid inlet and a liquid outlet of the pump body (12) are provided with an inlet check valve (11) and an outlet check valve (14). By adopting a single lobe to drive two plungers, the invention solves long-standing technical problem of output flux and pressure fluctuation in the high-pressure constant flow pump of the liquid phase chromatograph. The invention has advantages of stable pressure and small fluctuation of output liquid, small volume, easy assembly and simple operation.

Description

technical field [0001] The invention belongs to analytical instruments, in particular to a single-cam high-pressure constant-flow pump for a liquid chromatograph. Background technique [0002] Liquid chromatography is an instrument for chromatographic analysis of sample solutions, and is used in laboratories for constant and trace analysis of liquid or solid samples dissolved in liquid. It is especially suitable for quality supervision, inspection and control in pesticide, chemical fertilizer, medicine, epidemic prevention, environmental protection, commodity inspection, food, beverage, wine, feed, petrochemical, coal, dyestuff, fine chemical and other industries. It is widely used in organic chemical industry, organic synthesis, analytical chemistry, biochemistry, bioengineering, amino acid analysis, national defense scientific research and teaching and other fields. [0003] The liquid chromatograph is mainly composed of a sampling system, an infusion system, a separation...

Claims

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Application Information

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IPC IPC(8): F04B9/04G01N30/02
Inventor 许生蛟黄飞
Owner SHANGHAI SUNNY HENGPING SCI INSTR
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