High-efficiency constant-pressure tangent fire pump

Abstract

The invention relates to a high-efficiency constant-pressure tangent fire pump. The high-efficiency constant-pressure tangent fire pump comprises a pump body, a pump cover, an impeller, a water suction chamber, a pumping chamber and a diffusion pipe. The high-efficiency constant-pressure tangent fire pump is characterized in that the pumping chamber of the pump body is of a spiral pumping structure, and the spiral pumping chamber is provided with a separation tongue; the impeller is a rear-cover-plate semi-open type impeller with an impeller seal ring; the pump cover is provided with a seal ring. The high-efficiency constant-pressure tangent fire pump has the advantages that efficiency is obviously higher than that of a common constant-pressure fire pump, and the development requirement for high efficiency and energy saving is met; axial force is balanced effectively; mechanical seal bearing pressure is reduced; when the high-efficiency constant-pressure tangent fire pump is made into a vertical structure, a pump inlet and a pump outlet can be deigned to be on the same straight line, and therefore a pump set can be installed on a pipeline like valves.

Description

technical field [0001] The invention relates to a high-efficiency constant-pressure tangential fire pump. Background technique [0002] The remarkable feature of constant pressure fire pump (tangent pump) is that the flow-head curve is very flat (the change of head is small in the full flow range, especially when the flow is small, and there is no overpressure), which solves the large pressure fluctuation when the flow changes in the fire water supply process. problem. Conventional constant pressure fire pump (tangent pump) is composed of three parts: pump body, impeller and pump cover; figure 1 . The pump body is an annular pressure water chamber structure, the impeller is a partially open structure of the back cover, and the pump cover is a structure without a sealing ring. The open impeller rotates in the annular pressure water chamber, and only part of the liquid enters the diffuser pipe from the tangential direction. Its disadvantages As follows: 1. The gap between t...

AI Technical Summary

Problems solved by technology

The pump body is an annular pressure water chamber structure, the impeller is a partially open structure of the back cover, and the pump cover is a structure without a sealing ring. The open impeller rotates in the annular pressure water chamber, and only part of the liquid enters the diffuser pipe from the tangential direction. Its disadvantages As follows: 1. The gap between the impeller and the pressurized water chamber is large, and part of the liquid rotates in the annular pressurized water chamber, resulting in a large loss; 2. The open impeller has a large gap loss because there is no cover plate; 3. The pump cover has no sealing ring There is hydraulic loss, and the axial force cannot be effectively balanced, and the mechanical seal is under high pressure

Structural reasons lead to the low efficiency of conventional constant pressure fire pumps, which cannot meet the requirements of high efficiency and energy saving

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