High-pressure constant flow pump for single lobe of liquid chromatograph
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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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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 affect
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[0025] Hereinafter, the present invention will be further described through specific embodiments in conjunction with the drawings.
[0026] Single cam high pressure constant flow pump for liquid chromatograph, consisting of stepper motor (1), timing belt (3), bearing (5), worm (6), worm gear (7), worm gear shaft (8), cam (9) , Composed of plunger rod (10) and 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. A transmission belt (3) is connected to the synchronous belt pulley (2), and the transmission belt (3) drives the driven synchronous belt pulley (4) to rotate. The driven synchronous pulley (4) drives the worm (6) and the worm wheel (7) to rotate; the worm (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 gear shaft (8) are provided with bearings (5); the end surface of the worm gear shaft...
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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...
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