Safety protection circuit of mine cooling system and control method

Abstract

The invention relates to a safety protection circuit of a mine cooling system and a control method and relates to the technical field of coal mine cooling, and solves the problem of how to avoid frostcrack of a corrugated copper tube in a refrigerator. The anode and cathode of a power supply are connected to a line comprehensive protecting device through a micro circuit breaker. A refrigerator remote control circuit comprises a remote control selection switch, a remote control switching knob and a first normally open contact of a shutdown relay of a freezing pump, and the remote control selection switch, the remote control switching knob, the line comprehensive protecting device and a high voltage circuit breaker which are connected in series successively are connected to the power supplythrough the micro circuit breaker. The remote control selection switch, the first normally open contact of the shutdown relay of the freezing pump, the line comprehensive protecting device and the high voltage circuit breaker are successively connected in series are connected to the power supply through the micro circuit breaker. A refrigerator near control circuit, the line comprehensive protecting device and the high voltage circuit breaker are successively connected in series are connected to the power supply through the micro circuit breaker. The safety protection circuit avoids an accident of frost crack of the corrugated copper tube in the refrigerator, optimizes the safety protection function of a refrigeration system and improves the safety of the refrigeration system.

Description

technical field [0001] The invention belongs to the technical field of cooling in coal mines, and in particular relates to a safety protection circuit and a control method for a cooling system in a mine. Background technique [0002] The coal mine cooling system is equipped with a set of thermal and electric refrigeration units according to the refrigeration capacity. A chilled water circulation pump is installed on the primary side of the ground refrigeration room. The pump cannot pump out the chilled water in the refrigeration unit in time due to failure, which will cause the chilled water in the refrigeration unit to freeze and freeze the corrugated copper pipes in the unit. There are more than 900 corrugated copper tubes in the evaporator of a refrigeration unit. The cost of replacing a corrugated copper tube (corrugated copper tube + labor) is about 1,000 yuan. The economic loss of this item is more than 450,000 yuan; and when the coal mine is in production, once the r...

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Problems solved by technology

[0002] The coal mine cooling system is equipped with a set of thermal and electric refrigeration units according to the refrigeration capacity. A chilled water circulation pump is installed on the primary side of the ground refrigeration room. The pump cannot pump out the chilled water in the refrigeration unit in time due to failure, which will cause the chilled water in the refrigeration unit to freeze and damage the corrugated copper pipes in the unit

There are more than 900 corrugated copper tubes in the evaporator of a refrigeration unit. The cost of replacing a corrugated copper tube (corrugated copper tube + labor) is about 1,000 yuan. The economic loss of this item is more than 450,000 yuan; and when the coal mine is in production, once the refrigeration unit stops running, the temperature of most working faces and tunneling heads in the mine will exceed the limit, resulting in heatstroke of the staff and stopping the head and face. and great loss

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