Low-specific-speed self-balancing multi-stage chemical pump and process method

Abstract

The invention discloses a low-specific-speed self-balancing multi-stage chemical pump which comprises a pump shaft, a suction section, an outlet section, welding impellers, a switching section, a filter screen and a filter screen support. The welding impellers are arranged on the pump shaft in a bilateral symmetry mode, the outlet section is arranged in the middle between the welding impellers, and the outlet section is provided with an annular delivery chamber; an annular cavity is formed in the left side of the delivery chamber; a center hole is formed in the axis of the right half part of the pump shaft, and a first radial through hole and a second radial through hole are formed in the pump shaft in the radial direction; a deslagging elbow and a valve are sequentially connected to the position, close to the left side, of the lower part of the cylindrical surface of the outlet section; and each welding impeller comprises a semi-open impeller and a front cover plate, each semi-open impeller comprises a rear cover plate and a plurality of blades, and the blades and one corresponding front cover plate are fixed through welding. According to the low-specific-speed self-balancing multi-stage chemical pump provided by the invention, the precision of an impeller runner is guaranteed, and the hydraulic efficiency is improved; the axial force is balanced, and the service life of a bearing is prolonged; and the structure is reduced, and the cost of the pump is saved.

Description

technical field [0001] The invention relates to the field of industrial pumps, in particular to a low specific speed self-balancing multistage chemical pump. Background technique [0002] Low specific speed multi-stage chemical pumps are widely used in fine chemical and daily chemical fields to transport various chemical media. The specific speed of the low specific speed multi-stage chemical pump is generally less than 30, and the flow rate is less than 15m 3 / h, the flow rate can be as low as 0.25m 3 / h, the head is as high as hundreds of meters, which makes the flow path of the pump very narrow, especially when the outlet width of the pump impeller flow path is the narrowest, it is less than 2mm. Guarantee the accuracy of the flow path and the performance requirements of the pump. At the same time, due to the large number of impeller stages in the prior art multi-stage chemical pump with low specific speed, the axial force is relatively large, and the axial force balan...

AI Technical Summary

Problems solved by technology

The specific speed of the low specific speed multi-stage chemical pump is generally less than 30, and the flow rate is less than 15m 3 / h, the flow rate can be as low as 0.25m 3 / h, the head is as high as hundreds of meters, which makes the flow path of the pump very narrow, especially when the outlet width of the pump impeller flow path is the narrowest, it is less than 2mm. Ensure flow path accuracy and pump performance requirements

At the same time, due to the large number of impeller stages and the large axial force of the low specific speed multi-stage chemical pump in the prior art, the axial force balance of the pump is also a problem.

Finally, the structure of the low specific speed multi-stage chemical pump in the prior art is large, and the cost needs to be further reduced

[0003] The casting process of the prior art is difficult to ensure the accuracy of the impeller channel with a width of less than 2 mm. The lighter ones are likely to cause deformation or uneven width of the impeller channel, and the more severe ones block the channel and seriously affect the performance of the pump; the stamping of the prior art The impeller can only be stamped with a plate thickness of about 1mm, and the low specific speed multi-stage chemical pump is used in the field of fine chemical and daily chemical industry, and a corrosion allowance of about 1mm must be left, so the stamped impeller cannot meet the requirements.

Images