China Deep Well Pumps Manufacturers

The intersection of the pump characteristic curve Q-H and the pipeline characteristic curve Q;h is the limit operating point of the pump when the valve is fully opened. Frequency conversion speed regulation The deviation of the working condition point from the high-efficiency zone is the basic condition for the pump to need speed regulation.

2. This method is easy to operate, continuous in flow, and can be adjusted between flow and zero at will, and no additional investment is required, and it is applicable to a wide range of occasions. When the valve is fully closed, it is equivalent to infinite resistance and zero flow.

Obviously, compared with valve throttling, the energy saving effect of frequency conversion speed regulation is very prominent, and the working efficiency of horizontal multistage centrifugal pumps is higher. When the valve is closed, the local resistance of the pipeline increases, the pump operating point moves to the left, and the corresponding flow decreases. It can be seen that when the valve is closed to control the flow, the water supply capacity of the multi-stage centrifugal pump itself remains unchanged, the head characteristics remain unchanged, and the pipe resistance characteristics will change with the change of the valve opening. At this time, the pipeline characteristic curve coincides with the ordinate. , Thereby eliminating the destructive water hammer effect to a large extent, greatly extending the life of the pump and piping system..

The simple way to change the flow rate of a centrifugal pump by valve throttling is to adjust the opening of the pump outlet valve, while the speed of the horizontal multistage centrifugal pump remains unchanged (generally the rated speed), which is essentially to change the pipeline characteristics The position of the curve changes the working point China Deep Well Pumps Manufacturers of the pump. When the rotation speed of the multistage centrifugal pump changes, the valve opening remains unchanged, the pipeline system characteristics remain unchanged, and the water supply capacity and head characteristics change accordingly

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China Surface Pumps Manufacturers

The chemical pump oil seal is a self-tightening lip seal with simple structure, small size, low cost, convenient maintenance, and low resistance torque. It can prevent the leakage of the medium and the intrusion of external dust and other harmful substances. It has a certain ability to compensate for wear, but it is not resistant to high pressure, so it is generally used on chemical pumps in low pressure occasions.

Chemical pumps rely on centrifugal principles to extract liquid materials. Chemical pumps made of special materials are suitable for pumping corrosive liquids from bottles, barrels, cylinders, pools or other containers. Due to the existence of dangers such as corrosion, volatilization, and explosion of the medium pumped by chemical pumps, the sealing performance requirements of the pump body are much higher than other types of pumps.

The oil seal of the chemical pump should be installed on the shaft with a manufacturing accuracy of h8～h9, a surface roughness of 1.6～0.8μm and a surface hardening treatment. The sealing medium should not contain solid particles and impurities, otherwise it will cause rapid wear of the oil seal and shaft and cause the seal to fail.

(3) The oil seals used on machinery should be inspected, maintained and maintained frequently when the working conditions of the oil seals are bad, the environmental temperature difference is large, the dust is too much, and the machine vibration frequently causes the mechanical force status to change constantly.

(4) If the shaft China Surface Pumps Manufacturers and bearing wear is serious; the oil seal rubber is aging or the spring fails, etc., repair and replace the corresponding parts in time.

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