A protective liquid level switch for high-temperature boiler

Abstract

The invention discloses a protective liquid level switch for a high-temperature boiler. The switch includes a junction box, inlet port and terminal, the inlet port is connected to the upper end of thejunction box, the terminal is fixedly connected with the inner bottom wall of the terminal box, the lower end of the junction box is fixedly connected with a sleeve, As that slide block and the firstball are added, so that the connecting rod can be kept smooth and smooth during the lifting process, No jamming, This is extremely protective, Prevent the fluid level switch from becoming stuck and losing its function, thereby posing a danger, By adding a ring frame, The second magnetic steel and the floating plate further play a protective role. When the connecting rod is stuck, the floating plate drives the ring frame to rise, thereby driving the second magnetic steel to attract the first magnetic steel so as to achieve the effect of turning on the line alarm. The existence of the air bag enables the floating plate to float more easily, and the sealing ring can play a sealing role at the same time.

Description

technical field [0001] The invention relates to the technical field of liquid level switches, in particular to a protective liquid level switch for high-temperature boilers. Background technique [0002] In a power plant, in order to reduce energy loss, a part of the high-pressure steam that has done useful work is extracted, and a high-pressure heater is used to heat the boiler feed water or other heat exchangers, such as low-pressure heaters, preheaters, etc., and the boiler It is a very effective energy-saving measure to increase the temperature of feed water step by step and save coal or other energy substances. [0003] How to monitor and control the liquid level in the high-pressure heater is extremely important to the safe operation of the heater. The following liquid level gauges are mostly used for monitoring in the prior art: [0004] 1. Electric contact liquid level gauge: a non-continuous measurement liquid level gauge, which displays the liquid level value with...

AI Technical Summary

Problems solved by technology

However, the float body under high temperature and high pressure needs to be made very large to float, which brings two problems. One is that the float itself is prone to leakage or being crushed, which makes the liquid level gauge unable to work and cannot be monitored safely and reliably. The change of liquid level affects the safe operation of on-site equipment; on the other hand, the volume of the liquid level gauge itself has to be very large, which is inconvenient to install

[0006] 3. Two-color water level gauge: it can only be used for local liquid level display, there is no analog or switch output, and the interlock control function cannot be realized

[0007] However, these water level gauges are only a single switch. If the switch is stuck or in poor contact, an alarm cannot be issued. Therefore, a protective liquid level switch for high-temperature boilers is proposed, which can double early warning. By adding a floating mechanism and Contact mechanism, the two cooperate with each other to increase the sensitivity of the liquid level switch

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