Improved fan oil station electrical control system

Abstract

The invention particularly discloses an improved fan oil station electrical control system, which comprises a main loop and a secondary loop, wherein the main loop comprises a primary power supply circuit of an oil station pump; the secondary loop comprises a control loop of the oil station pump and an instrument-controlling instrument control loop; primary power supplies of the oil station pump in the main loop respectively supply power directly; phase-sequence relays are introduced to direct power supply ends of the primary power supplies of the oil station pump; second power supplies in the oil station pump control circuit in the secondary loop are respectively introduced by C-phase power supplies of the first power supply; and a two-position relay and a DCS (Distributed Control System) control point are arranged in the oil station pump control loop of the secondary loop.

Description

technical field [0001] The invention relates to an improved electric control system of a fan oil station. Background technique [0002] The small thin oil station is mainly used in the thin oil circulation lubrication system of mechanical equipment such as metallurgy and power generation. It supplies lubricating oil to friction parts such as reducers, induced draft fans, blowers, and active motor bearings. It is an important part of auxiliary equipment. The small thin oil station is mainly composed of fuel tank, oil pump device, filter, tubular oil cooler, electric control cabinet, instrument panel, pipelines, valves, etc., and the electrical control system of the electric control cabinet is the heart of the thin oil station. The source of power, therefore, the quality of the electrical control system directly affects the safety, stability and efficacy of the entire thin oil station. At present, there are main shortcomings in the electrical control system of small thin oil ...

AI Technical Summary

Problems solved by technology

Its switching circuit is activated by multi-level contacts, which inevitably increases the hidden danger of circuit breakpoints, while the airbag of the airbag relay is greatly affected by the ambient temperature, such as time changes, non-returning, etc.

Therefore, if the switching control circuit fails, even if the backup secondary power supply is normal, it will cause all pumps in the oil station to lose pressure, which will cause the fan to trip and the unit to shut down.

[0005] 2. The secondary circuit is not perfect

The components of the control instrument are installed on the main body of the gas station and connected to the electric control cabinet through cables. The components of the control instrument are integrated with the mechanical pipeline. The operating environment is more complicated than that of the electric control cabinet. The secondary circuit system loses power. Similarly, although the failure probability of the pump control circuit in the electric control cabinet is small, once there is a fault, it will also cause the entire secondary circuit system to lose power.

Furthermore, if a small transformer fails, it will also cause the entire secondary circuit system to lose power

[0007] 3. The lack of monitoring of the pump power supply of the oil station

[0010] To sum up, if all the pumps in the oil station lose pressure, it will cause the fan to trip and the unit to shut down.

Therefore, the rapid self-starting of thin oil stations after loss of pressure is particularly important. Looking at the current data of thin oil stations, the thin oil stations produced and applied by various domestic companies have not yet found an electrical control system for thin oil stations that has the function of self-starting under pressure loss.

[0011] 5. Hidden dangers of interlock function

[0012] The interlocking between the pumps starts after the multi-level contacts are connected, so there are many hidden dangers

Poor contact of any interlocking circuit contact or bad start of the starting relay will cause the failure of the entire interlocking circuit. In case of failure, the backup pump cannot be put into operation in time, and the result is that the fan trips and the unit stops.

[0013] 6. DCS remote control function and DCS alarm point are not perfect

[0014] At present, the DCS remote control of some small thin oil stations in China is only aimed at the start-up circuit, and the two pumps in the station cannot be controlled separately. The six major fan oil stations of the third phase of Datang Huangdao Power Generation Co., Ltd. also have this defect

The on-site alarm points are not all introduced into DCS, which makes the operation of the operators cumbersome and there are blind spots in the monitoring. It is necessary to go to the local electric control cabinet to check all the alarm points.

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