Explanation of common faults of vacuum precooling machine

　　The following are some common fault descriptions and troubleshooting methods for vacuum precoolers compiled by the technical engineers of Ganzhou Dachang Air Conditioning Equipment Engineering Co., Ltd. The methods and explanations are for reference only. If you have any questions, please leave me a message or call our phone number!

　　1. The vacuum degree is not high

　　Possible reasons:

　　1. The pump itself is leaking: the sealing ring and gas ballast valve gasket are damaged or not tightened, and the exhaust valve piece is damaged, resulting in poor sealing.

　　2. The pump temperature is too high. It may be that the valve plate or inner cavity of the pump is scratched and worn, and the rotor axis is displaced, causing single-sided wear.

　　3. There is a problem with the pump oil: 1. The oil level is too low and the seal is not tight; 2. The oil is contaminated and turns milky yellow; 3. The oil level is normal, the oil circuit is blocked, and the appropriate amount of oil is not maintained in the pump cavity.

　　4. The air inlet filter of the vacuum cooler is blocked.

　　Troubleshooting methods and solutions:

　　1. Reassemble after repair.

　　2. Refuel; change the oil; check the oil pipeline and the oil intake of the oil valve.

　　3. Replace the sealing ring or valve plate according to the specific situation.

　　4. Remove and clean.

　　2. The motor is overloaded and there are abnormal noises during pump operation.

　　Possible reasons:

　　1. The filter is damaged and debris falls into the pump.

　　2. The pump cavity is seriously polluted and the parts are corroded.

　　3. The spring is deformed or broken, causing uneven stress on the rotor and causing impact sounds.

　　4. The pump chamber shaft and sleeve are too tight, causing poor lubrication.

　　5. The pump temperature is too high. It may be that the valve plate or inner cavity of the pump is scratched and worn, and the rotor axis is displaced, causing one-sided wear.

　　Troubleshooting methods and solutions:

　　1. Replace the spring.

　　2. Remove and clean.

　　3. Replace with special new oil.

　　4. Reassemble after repair.

　　5. Reassemble and clear the oil passage.

　　三、真空冷却机压缩机漏油、喷油

　　Possible reasons:

　　1、进气口压强过高。

　　2、油量过多，产生喷油。

　　3、排气盖下面的挡油网装反，引起喷油。

　　4、转轴、油窗、放油孔等部位的密封圈损坏或装配不正确。

　　Troubleshooting methods and solutions:

　　1、设法减少进油量。

　　2、放出一部分油。

　　3、重新装配。

　　4、更换密封圈或重新装配。

　　Four,关于真空预冷设备的维护保养

　　1、启动机组前必需确认管路连接上的四个截止均在全开状态，机组启动观察风机转向(如风机反转，即需调换两根相线)、压缩机的启动情况( 压缩机启动用高压表压力升高，低压表压力下降，液管温度上升，气管温度下降)，系统有无杂音或不正常的振动。

　　2、启动时发现有异常情况应立即关机，判断原因后再处理。

　　3、机组投入运行后应定期测定观察压缩机、风机的运行电流、高低压力等，并及时做好记录，以便管理、总结。

　　4、机组所有电控元件及保护装置在出厂前均已经过严格测试，请用户不要在检查或维护时自行更改或折除，在无保护状况下的强制运行必将对机组造成较大损伤。

　　5、日常保养必须做到以下几点，以避免可能发生的故障，并使机组保持正常高效运转。

　　(1)翅片盘管换热器应视积灰污染情况定期冲洗，冲洗时应注意电器安全。

　　(2)定期对室内离心风机运行时的电流进行检查，对皮带传动的离心风机，定期检查皮带的松紧程度。

　　6、每月至少一次进行定期全机性检查，包括电器线路和电器件有无松动，机组各部分的运转声音，制冷系统有无泄漏(观察低压表)，温度探头及探头线是否完好，操作开关是否松动。

　　7、机组发生故障停机时，先按机组的停止按钮(报警灯将熄灭)再检查故障原因，在故障未排除之前，不得强行开机。

　　8、若非紧急情况，不得通过切断主电源来关机。若需短期停机，(时间少于7天)只要按下机组的停机按钮即可，不用关闭主电源，若机组要长期停机，则先关闭机组，再关闭主电源，并将系统内的水放尽。

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