Double limited self-locking ball screen

Abstract

The invention discloses a double limited self-locking ball screen. The ball screen comprises a cylinder, an otter board arranged in the cylinder, and a ball outlet arranged on a side wall of the cylinder. A three-link-rod driver is connected at a bottom end of the otter board, and comprises a first link rod, a second link rod and a third link rod, which are connected with one another through a movable limiting clip slot. The second link rod is connected with a rack through a mounting hole. The rack has bottom threads connected with a locking nut, one teeth side engaged with a gear, and the other teeth-free side arranged with a positioning roller. The inventive ball screen adopts the three-link-rod driver to realize three states of the ball screen, can achieve the basic function, but also thoroughly clean the otter board under the back flushing condition, and has advantages of simple structure, low abrasion of a movement mechanism, high ball collecting ration, good operation stability, and high reliability.

Description

technical field [0001] The invention relates to the technical field of heat exchanger cleaning, in particular to a double-limit self-locking ball collecting net used for cleaning cooling water pipelines of thermal power generation, nuclear power and various tubular heat exchangers. Background technique [0002] The rubber ball cleaning system is used to complete the cleaning of the tubular heat exchanger. It uses rubber balls to repeatedly clean the condensing pipes to ensure the cleaning coefficient of the heat exchange tubes in the steam turbine and other condensers, thereby improving the power generation efficiency of the generator set and effectively preventing heat transfer. The fouling and corrosion of the tubes can be prevented, and the service life of the heat exchange tubes can be extended to the greatest extent. The ball collecting net is the key equipment in the rubber ball cleaning system. It is installed on the outlet pipe section of the condenser circulating wa...

AI Technical Summary

Problems solved by technology

The above-mentioned products mainly have the following problems during the use of the common ball collecting nets in the prior art: 1) The existing ball collecting nets have problems such as unreasonable structure, unstable transmission mechanism, and easy wear and tear. There are phenomena such as ball running, ball accumulation, ball jamming, and ball pinching; 2) The ball collecting net itself does not have a self-locking function, and it is only controlled and limited by electric actuators in various working conditions, so that actuators often appear in use. If the operating angle is too high, the net plate cannot be closed tightly, and it is not easy to be detected (it cannot be found from the outside, it only shows that the ball collection rate is low); Basically parallel, unable to achieve backwashing, it can only wash away the sundries accumulated on the surface of the net, and cannot clean up the sundries in the grille; 4) The control part of the original net needs too much power, Not suitable for manual operation when the electric actuator fails

The device reduces components, simplifies the structure, and reduces the cost. When the screen plate is working at the limit position of the ball collection and cleaning conditions, the connecting rod and the crank are in line, and the self-locking effect is achieved through the control of the external electric actuator. purpose, but there are still disadvantages of excessive transmission and difficulty in achieving the backwash state

Images