Classification of submersible pumps

Thread Content

Classification of submersible pumps: I. Fixed-type submersible pumps are typically used in low-pressure straight pipelines. Their sealing performance depends entirely on the fit between the plug and the plug body, and the compression of the sealing surface is achieved by tightening the nut at the bottom. It is generally used for PN≤0.6Mpa. II. Packed submersible pumps. A packed submersible pump achieves sealing of the plug and the pump body by compressing the packing. Due to the filler, it has good sealing performance. Typically, such submersible pumps have a packing gland, and the plug does not need to extend outside the valve body, thereby reducing a pathway for the leakage of the working medium. These submersible pumps are widely used in applications with a pressure of PN≤1Mpa. Third, self-sealing submersible pumps: These pumps achieve a tight seal between the plug and the pump body by utilizing the pressure of the medium itself. The small end of the plug protrudes upward outside the body, and the medium enters through the small hole at the inlet, pressing the plug upward. This type of structure is generally used for air-based media. IV. Oil-sealed submersible pumps: In recent years, the application scope of submersible pumps has been expanding, and oil-sealed submersible pumps equipped with forced lubrication have emerged. Due to forced lubrication, an oil film is formed between the sealing surfaces of the plug and the plug body. This provides better sealing performance, makes opening and closing easier, and prevents damage to the sealing surfaces. It is not supported by rolling bearings or sliding bearings; therefore, it operates quietly without noise. There is no liquid splashing at the shaft seal. The sealing packing area is equipped with a cooling system that can use cooling water to remove heat, depending on the temperature of the medium used by the user. Shanghai Shengou Pump Valve Co., Ltd. 021-54148004