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汽车空调不制冷的原因与检查方法

文章出处: 发表时间:2017-07-04 14:25:36

汽车空调不制冷或凉气缺乏是空调器的常见毛病,对其基本的修理办法通常修理工都能把握,即从简单部位入手,经过眼观耳听找到因素或部位,称之为感官查看法,而另一种查看办法外表查看法,简单被忽视,该办法通常能协助精确方便地查找毛病因素。

Automotive air conditioning refrigeration or air conditioner is the lack of common problems, the basic maintenance methods usually repairman can grasp, that is from simple starting position, after seeing and hearing to find factors or parts, called sensory check method, and another way to view the outside view, simply ignored this method usually can help accurately and conveniently find fault factors.
一、感官查看法:
First, the sense of view method:
1.紧缩机工作状况:
1. tightening machine working conditions:
传动皮带是不是断裂或松懈若传动皮带太松就会打滑,加快磨损而不能传递动力。
The drive belt is not broken or loose if the drive belt is too loose will accelerate the wear and not slip, power transmission.
紧缩机内部是不是有噪声。
Is there any noise in the compressor?.
噪声可能是因为损坏的内部零件造成的,内部磨损就不能有用紧缩。
Noise may be caused by damaged internal parts, and internal wear will not be useful.
紧缩机离合器是不是打滑。
Tightening machine clutch is not slipping?.
2.冷凝器及电扇状况:
2. condenser and fan status:
冷凝器散热片是不是被尘土掩盖
Is the condenser radiator covered with dust?
假如冷凝器散热片被尘土掩盖,冷凝器的功率就会大大降低。
If the condenser radiator is covered by dust, the condenser power will be greatly reduced.
冷凝器电扇是不是工作杰出。
Condenser fan work is outstanding?.
3.鼓风机电扇工作状况
3. working conditions of blower and fan
使风机在“低、中、高”三速度下工作,若有异响或电动机工作不良,则应进行修理或替换,否则送风气流缺乏。
Make fan work at "low, medium, high" three speed, if there is abnormal sound or motor work is bad, should be repaired or replaced, otherwise the supply of air flow is lacking.
4.制冷剂液量的查看
4. check the refrigerant volume
经过调查窗如看到很多气泡,阐明制冷剂缺乏。若向冷凝器泼水,使其冷却,在调查窗口仍见不到泡沫,阐明制冷剂过量。
After investigation, the window sees a lot of bubbles, explaining the lack of refrigerant. If water is cooled in the condenser and foam is not found at the investigation window, the excess refrigerant is indicated.
查看各设备衔接处和接缝是不是有油污
Check the joints and joints of the equipment for oil contamination
在衔接处或接缝有油污,标明该处有制冷剂走漏,应从头坚固或替换有关零件。(可用检漏仪测漏)
There is oil pollution in the joints or seams, indicating there are refrigerant leakage, should from the firm or relevant parts replacement. (available leak detector)
5.暖通阀或热控风挡是不是封闭,别的风挡调理是不是正常
5., heating valve or thermal control windshield is closed, other windshield conditioning is not normal?
(注:若紧缩离合器不能吸合,鼓风机电扇不能工作,冷凝器电扇不能工作等等,应先进入有关电气系统查看,如继电器、传感器、电路断路或短路,操控单元等)。
(Note: if the tightening clutch can not pull the blower fan not working, condenser fan does not work, should first enter the electrical system to view, such as relays, sensors, open circuit or short circuit, control unit).
二、外表查看法
Two, look at the appearance of law
这种办法使用成套雪种压力表查找毛病方位。首要关紧压力表的高压端和低压端开关,在停机状况下,将制冷剂加注软管衔接在紧缩机相应的修理阀上,并使用制冷 设备中的制冷剂压力,排出软管中的空气。此刻高低压端读数应处于平衡状况(约6kg/cm2)起动发动机,维持在150rpm,鼓风机转速设在最高级,凉 气设定在最大方位,处于“再循环”状况。正常读数为:
This method uses a set of snow pressure gauges to find the location of the fault. High end primary pressure meter and low voltage closed switch in shutdown conditions, the refrigerant filling hose connection in compressor the corresponding repair valve, and pressure of refrigerant in refrigeration equipment, air discharge hose. At the moment the high pressure end reading should be in balance (about 6kg/cm2) to start the engine, maintained at 150rpm, located in the most advanced air blower speed, set at the maximum range, in the "recycling" status. Normal reading is:
低压端高压端
Low voltage terminal
R-134a 1.5-2.5kg/cm2 14-16kg/cm2
R-134a 1.5-2.5kg/cm2 14-16kg/cm2
R-12 1.5-2.0kg/cm2 13-15kg/cm2
R-12 1.5-2.0kg/cm2 13-15kg/cm2
1.高压侧与低压侧压力表指示值比规范值低,经过调查孔可见气泡。
1. the pressure indicator on the high pressure side and the low pressure side is lower than the standard value, and the bubbles can be seen through the investigation hole.
因素:制冷循环漏气;制冷剂没有定时补足。
Factors: refrigeration cycle leakage; refrigerant does not make up regularly.
处理:用测漏仪测漏,并进行修理,补足制冷剂。
Treatment: a leak leak detector, and repair, make up the refrigerant.
2.低压侧压力表指示负压,高压侧指示比正常值低,储液罐/干燥器前后管路有温差,严峻时,储液罐/干燥器后管路有霜。
2. the low side pressure gauge indicates the negative pressure. The high pressure side indication is lower than the normal value. There is a temperature difference between the front and the back of the tank / dryer. When severe, the line is stored in the tank and dryer.
因素:膨胀阀或低压管路堵塞,储液罐/干燥器或高压管路堵塞;膨胀阀压力泡漏气,针阀彻底封闭。
Factors: expansion valve or low pressure pipeline blocked, liquid storage tank / dryer or high-pressure pipe plug; expansion valve pressure bubble leak, needle valve completely closed.
处理:清除或替换有关部件和储液罐/干燥器,若压力泡漏气,替换膨胀阀。
Handling: removing or replacing parts and storage tanks / dryers. Replace the expansion valve if the pressure bubble leaks.
3.高、低压两边,压力表均指示比规范值高,冷凝器排出侧不热。
3. on both sides of high and low pressure gauges are higher than the standard value, the condenser discharge side is not hot.
因素:制冷剂填充过量。
Factor: excessive refrigerant filling.
处理:排出剩余制冷剂,使压力合格。
Disposal: discharge remaining refrigerant to make pressure qualified.
4.在高、低压两边,压力表均指示比正常值高,但停机后,高压侧压力急骤降至约2kg/cm2。
4 in the high and low pressure sides, pressure gauge indication value were higher than normal, but after the shutdown, the high side pressure suddenly dropped to about 2kg/cm2.
因素:制冷循环中混入空气(抽暇不行或填充时有空气进入)。
Factors: the mixed air refrigeration cycle (or not chouxia filled with air into).
处理:从头抽暇加注,如仍有上述症状,替换储液罐/干燥器及紧缩机油。
Processing: de novo chouxia filling, if still have the above symptoms, replacement of the liquid storage tank / dryer and compressor oil.
5.高、低压侧压力表均指示比正常值高,低压侧管路构成霜冻或深度冷凝。
5. high and low pressure gauges indicate higher than normal values, and low pressure side pipes form frost or deep condensation.
因素:膨胀阀失效(针阀敞开过宽);膨胀阀压力泡与蒸发器衔接断开。
Factors: expansion valve failure (needle valve open too wide); expansion valve pressure bubble and evaporator connection disconnect.
处理:查看和从头接好压力泡或替换膨胀阀。
Handling: check and start with the pressure bubble or replace the expansion valve.
6.低压侧压力高,高压侧压力低,停机后,两边压力当即趋于平衡。
6. the pressure on the low side is high and the pressure on the high side is low. After the stop, the pressure on both sides becomes balanced immediately.
因素:紧缩机阀、活塞或活塞环损坏,不能有用紧缩。
Factors: compressor valve, piston or piston ring damage, can not be useful contraction.
处理:替换紧缩机。
Fix: replace the compressor.
7.在低压与高压两边,压力表指示值动摇。
7. on both sides of the low pressure and high pressure, the indicator value of the pressure gauge is shaken.
因素:因为干燥器超饱合,制冷剂中的湿气不能去掉,使膨胀阀中的针阀冻结,导致冰堵,当制冷剂不再循环时,冰被周转热量冻结再冻结成冰,这一进程重复循环。
Factors: because the super saturated refrigerant dryer, moisture can not get rid of the needle valve, expansion of freezing, cause ice block, when the refrigerant circulation stops, the ice is frozen into ice and heat flow, the process of recycling.
处理:替换储液罐/干燥器及紧缩机油,从头抽真空加注。
Handling: replace the liquid storage tank / dryer and compressor oil, start with vacuum pumping.





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