Do you know all the protective devices for air-cooled chiller refrigeration compressors

Do you know all the protective devices for air-cooled chiller refrigeration compressors

1. Internal thermostat (installed inside the compressor)

In order to prevent the air-cooled chiller from running uninterruptedly for 24 hours, causing the compressor to operate under high load, the electromagnetic switch is not good, the overcurrent caused by the shaft holding, or the motor burned due to the motor temperature, the compressor is installed inside the compressor The internal thermostat, which is installed on the neutral contact of the three-phase motor, protects the motor by cutting off the three phases at the same time when an abnormality occurs.

2. Electromagnetic switch

The electromagnetic switch is used to control the operation of the refrigeration compressor of the air-cooled chiller of the air-cooled chiller, and the switch is to be stopped for the purpose of stopping, and the installation must be kept vertical. If the installation is wrong, the spring pressure of the node may change and noise , Resulting in lack of phase operation, for the compressor model with a direct power-off protector inside, no protector is required.

　　 Three, reverse phase protector

Scroll compressors and piston compressors are different in structure and cannot be reversed. Because the three-phase power supply of the air-cooled chiller will cause the compressor to reverse phase, it is necessary to install a reverse phase protector to prevent the refrigeration compressor from reversing. . After installing the reverse phase protector, the compressor can run in the normal phase, but not in the reverse phase. When the reverse phase occurs, the two wires of the power supply can be changed to normal phase by swapping.

　　 Fourth, exhaust temperature protector

In order to protect the compressor under high load operation or insufficient refrigerant, the air-cooled chiller system needs to be equipped with an exhaust temperature protector, and the exhaust temperature is set to be within the range of 130±5°C to compress When the machine stops, this temperature value refers to the detected temperature within 10cm of the compressor exhaust pipe from the outlet.

　　 Five, low voltage switch

　　 In order to protect the air-cooled chiller compressor from running when the refrigerant is insufficient, a low pressure switch is required. When the setting is above 0.03mpa, the compressor stops running. Once the compressor is running under the state of insufficient refrigerant, the temperature of the compressor part and the motor part will rise instantaneously. At this time, the low-pressure switch can be used to protect the compressor and the motor that cannot be protected by the internal temperature device and the exhaust temperature protector. Burn it for protection.

　　 Six, high voltage switch

　　The compressor can be stopped when the high pressure pressure rises abnormally, and the operating pressure is set below 3.0mpa.