Vertical internal and external mixing shaft-seal-free self-sucking pump

Abstract

The invention discloses a vertical internal and external mixing shaft-seal-free self-sucking pump which comprises a pump body, a pump cover, a pump shaft, a main impellor, a main impellor seal chamber, an assistant impellor chamber, an assistant impellor, a water sucking chamber, a water outlet, a water inlet pipe, a water inlet pipe flange, a volute chamber and a gas-water separation chamber, wherein the top surface of the main impellor and the top surface of the assistant impellor are respectively provided with a radial main impellor balancing rib and a radial assistant impellor balancing rib; the outer edge at the bottom surface of the assistant impellor is fixedly provided with an annular seal pad; and the bottom surface of the assistant impellor chamber is provided with an annular supporting plate. Through the self-sucking pump provided by the invention, the issue of air intake of a shaft seal can be solved, high-vacuum continuous air exhaust can be kept all the time in the self-sucking process, the self-sucking capability is improved, and the self-sucking time is shortened.

Description

technical field [0001] The invention relates to a self-priming pump, in particular to a vertical self-priming pump with internal and external mixing without shaft seal. Background technique [0002] Self-priming pump, that is, self-priming water pump, is a kind of water pump, which is divided into internal mixing type and external mixing type, and is used in large enterprises such as cement plants, petrochemical plants, and steel plants. [0003] The main structure of the vertical self-priming pump is: the pump body is composed of the upper and lower pump casings, the pump body is provided with a pump cover, and the pump body is equipped with a water absorption chamber, a vortex chamber, an air-water separation chamber and an auxiliary impeller chamber. The water suction chamber is provided with a water inlet pipe, and the inlet of the water inlet pipe has a flange for connecting external pipes for water supply. The top of the water suction chamber is provided with a water o...

AI Technical Summary

Problems solved by technology

[0008] (1) The shaft seal above the auxiliary impeller of the pump shaft is difficult to balance. The pressure difference between the external atmosphere and the high vacuum of the water suction chamber makes the shaft seal easy to inhale, which cannot guarantee the high vacuum continuous exhaust of the suction chamber of the self-priming pump, which will reduce the self-priming The self-priming ability of the pump makes the self-priming time of the pump long, the suction lift is low, and even the water cannot be sucked;

[0009] (2) Neither the internal mixing type nor the external mixing type self-priming pump makes full use of the return water speed, loses the kinetic energy of the return water flushing vertically downward, reduces the self-priming capacity of the self-priming pump, and makes the self-priming time of the pump lengthen;

[0010] (3) The vortex chamber has a single volute single outlet (single channel and single outlet) structure, resulting in a small external mixing area and reduced self-priming capacity;

[0011] (4) The outlet direction of the vortex chamber is in the horizontal direction, and the gas-water mixture enters the gas-water separation chamber from the horizontal direction, and the separated liquid in the gas-water separation chamber cross-merges with the unseparated gas-water mixture, resulting in a slower gas-water separation rate. slow;

[0012] (5) The top and side walls of the water-absorbing chamber are designed to be perpendicular to each other, resulting in easy retention of gas on the top of the water-absorbing chamber, and the air bubbles mixed in the water will cause a flow break during the process of impeller water absorption, which increases the water absorption resistance of the impeller and reduces the impeller. self-priming capacity;

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