Vertical suspended semi submersible vertical turbine pump impeller fixing structure

The fixed structure of the vertical suspended semi submersible vertical turbine pump impeller mainly consists of a pump shaft, an impeller body, an impeller clamp ring, and a connecting plate. Its feature is that the pump shaft includes a first section shaft and a second section shaft, and there is an annular groove where the impeller clamp ring can be placed adjacent to the first section shaft and the second section shaft. The impeller body includes a front cover plate, an impeller hub, impeller blades, and a rear cover plate. The impeller hub extends backward from the rear cover plate and ends at the annular groove, and the impeller hub is closely adjacent to the impeller clamp ring to achieve circumferential positioning of the impeller body; There is a fixed blind hole on the impeller hub that opens towards the rear of the impeller body, and the first section shaft is placed inside the fixed blind hole. The first section shaft is connected to the impeller hub through a key. This technical method reduces the length of the shaft, increases the stiffness of the shaft, and does not use impeller nuts for connection, ensuring that the actual flow state of the medium does not deviate from the design flow state.

[Technical Introduction]

Vertical suspended semi submersible vertical turbine pumps can be used to transport clean water, rainwater, iron oxide skin water, sewage below 55 ℃, corrosive industrial wastewater, seawater, and specially designed liquids up to 90 ℃; Widely used in industrial and mining enterprises such as water companies, sewage treatment plants, power plants, steel plants, mines, as well as municipal water supply and drainage, flood control and drainage projects. Due to its relatively harsh working environment, malfunctions may occur from time to time during the work process, causing production interruptions and even major production equipment accidents. Therefore, in order to ensure on-site safety production, facilitate maintenance, and improve work efficiency, it is necessary to make appropriate improvements to the structure of the vertical suspended semi submersible vertical turbine pump. At present, the majority of improvements to the structure of vertical suspended semi submersible vertical turbine pumps are focused on the support of the pump intermediate shaft, the selection of guide bearing materials and structures, and the improvement of coupling components, with little attention paid to the improvement of the impeller fixing structure. Generally speaking, the fixed structure of the impeller and the connection method of the shaft are mainly composed of components such as the impeller, impeller nut, flat washer, key, shaft, mechanical seal, etc. When the structural shape of the impeller nut surface is inconsistent with the hydraulic design shape of the impeller, it will cause the flow state of the medium to deviate from the design state during actual operation of the pump, which will affect the performance of the pump during actual operation; In addition, the commonly used connection method requires machining the hub at the impeller inlet when installing the impeller nut, which can easily damage the blades at the impeller inlet, destroy the hydraulic structure at the impeller inlet, and cause the flow state of the pump to deviate from the ideal state during operation. This scheme for positioning the impeller in a vertical suspended semi submersible vertical turbine pump proposes a positioning structure suitable for the impeller of a vertical suspended semi submersible vertical turbine pump. The structure includes a pump shaft with an impeller connection section, an impeller with an impeller fixing seat, a positioning cone sleeve between the impeller fixing seat and the impeller connection section, and a connecting flange fixedly combined with the first end of the positioning cone sleeve; The advantage of this structure is that it reduces the difficulty of assembly and disassembly.

[Technical Key Points]

1. A vertical suspended semi submersible vertical turbine pump impeller fixing structure, characterized in that the impeller fixing structure comprises a pump shaft (1), an impeller body (2), an impeller clamp ring (3), and a connecting plate (4) that are interconnected to form a whole; The pump shaft (1) comprises a first section shaft (11) and a second section shaft (12); The impeller body (2) comprises a front cover plate (21), an impeller hub (22), impeller blades (23), and a rear cover plate (24); Further comprising an annular groove (6) adjacent to the first section shaft (11) and the second section shaft (12) for placing an impeller retaining ring (3), wherein the impeller retaining ring (3) is placed in the annular groove (6); The impeller hub (22) extends backwards from the rear cover plate (24) and then terminates at the annular groove (6), and the impeller hub (22) is tightly attached to the impeller retaining ring (3) to achieve circumferential positioning of the impeller body (2); The impeller hub (22) has a fixed blind hole (5) with an opening facing towards the rear of the impeller body (2).