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1, the structural characteristics of the annular diaphragm pump first planar peristaltic rigid ring and the annular diaphragm is different from the general rotor pump and reciprocating diaphragm pump. In addition, the existing diaphragm pumps use a sheet-type diaphragm to separate the conveying medium and the working medium, and uses a reciprocating crank-and-rod mechanism, a three-valve mechanism, and an inlet and outlet valve groups; the annular diaphragm pump absorbs the hose pump and the flexible bushing Pump and other rotor pump characteristics, the rotary drive mechanism and annular diaphragm organic combination of novel structure, with a ring diaphragm to separate the transmission medium and the drive element, the transmission medium can not be leaked to the outside. The annular diaphragm pump is mainly composed of a pump body 1, an isolation mechanism 2, a rigid support ring 3, an annular diaphragm 4, a bearing sleeve 5, a bearing 6, a transmission shaft 7, a floating pressure ring and a pump cover; the end of the annular diaphragm is supported by a bearing The cover is pressed and fixed along the axial direction, and forms a closed volume with the pump cover, the rigid support ring and the pump body. When the transmission shaft rotates, the pump body forms a liquid suction and drainage chamber by means of the inlet and outlet isolation mechanism and the rigid support ring , To achieve the purpose of non-leakage of transport medium. The main structural features of the annular diaphragm pump are: (1) a flat peristaltic rigid support ring is provided between the diaphragm and the pump body; (2) the annular diaphragm has a built-in floating pressure ring; (3) the annular diaphragm separates the conveying medium from the lubricating medium ; (4) annular diaphragm pump exclusive combination of import and export isolation mechanism; (5) without the end of the valve and the import and export valve group; (6) a unique axial seal structure; (7) rigid support ring and the shaft between the bearing . 2, design points 2.1, flow ring diaphragm pump rigid support ring and isolation components, the pump body will be separated into suction and discharge liquid chamber, with the intake and discharge liquid chamber volume changes, the medium along the import to export continuous flow. The theoretical discharge rate per revolution should be: Q;, t = 10-'n (RZ-r2) BK [L] Where B - rigid support ring width, cm R - pump body cavity radius, cm r - rigidity Supporting ring radius, cm K - theoretical volume factor, the main consideration of the invalid seal angle α and structure size R, r and other effects on the theoretical flow; usually invalid seal angle α were controlled at 20. Within, K value can be accurately obtained, generally take 0.90-0.95 design R = r + e, where e is the eccentric value, cm. The theoretical flow rate of the pump is: Taking into account the pressure drop of the pump, the viscosity of the medium, the size of the gap and the influence of the pump speed on the flow rate, the rated flow rate of the pump is: Qr = KvQth where Kp-- volumetric coefficient 2.2, pump speed and pump Radial and axial clearance determination 2.2.1 Pump speed The relative sliding speed between the pump body, the pump cover and the rigid support ring is related to the pump speed due to the use of a flat peristaltic rigid support ring whose value can be estimated as : V = πne / 30 Shows reasonable control and reduce pump speed, you can reduce the friction and power loss, extend pump life, improve pump efficiency. As a rule of thumb, the pump speed is usually controlled in the n <300 min-1 range.
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