How to judge the quality of the Peng Rising Valve of the automobile air conditioner

At the air inlet of the condenser, it is generally equipped with an air filter that should be cleaned once a week to avoid dust in the car

Debris is adsorbed on the air filter and obstructs air circulation, resulting in insufficient cooling capacity.

In order to ensure that the whole air conditioning system can work normally and the cooling effect is good, it is crucial to keep the surface of the condenser clean.

Vital. For this reason, the condenser needs to be cleaned frequently to prevent oil, mud and other debris from adhering to the condenser. Maybe wash it regularly.

The mounting bracket of the pressure machine must not be loosened. The transmission V-belt is properly tight, and too loose will cause slippage, resulting in a decrease in the speed of the pressure machine and insufficient refrigeration capacity; Excessive tightness also exacerbates belt damage, resulting in premature damage to the crankshaft bearing. If the refrigeration oil can not be seen from the oil mirror of the pressurizer, it means that there is leakage in the air conditioning system, and it should be repaired in time to check whether the hoses of the air conditioning system are worn and aged.

If these hoses are worn, when the ambient temperature rises and the refrigeration system works, the pipes will burst, resulting in the leakage of refrigerant and refrigeration oil, and the complete failure of the air conditioning system.

If the hose is broken and the air conditioner continues to run, it will cause a lot of dirt and moisture to enter the compressor and other components, making the whole thing.

The air-conditioning system is scrapped. Therefore, it is necessary to check the rubber hose frequently, and deal with it in time if it is found to be worn.

The parts should be bandaged with a cloth, and the air conditioner should be stopped and sent for repair as soon as possible. Always check the circuit condition of the air conditioner to prevent the insulation layer of the wires from wearing. When the insurance of the air-conditioning system is burned, it is necessary to check the fault first, and then replace the fuse pipe with electricity after treatment, and do not short-circuit the fuse, otherwise it may be.

Burning out the entire wiring can also have an adverse effect on other circuits in the car.

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If the expansion valve is broken, the low-pressure pipe is not cool, the normal should be icy, the surface of the drying bottle is frosted, the condenser is frosted, the expansion valve or condenser can not hear the swishing sound, the high and low pressure pressure is abnormal, the high-pressure pressure is too high, the low-pressure pressure is very low, the throttle gauge may have almost no response, the temperature of the high-pressure pipe is abnormal, and so on are the reasons why the expansion valve is broken or cannot be opened.

The phenomenon that the expansion valve of the automobile air conditioner is broken is:

There is a fault of blockage or throttling failure, resulting in no or insufficient cooling of the air conditioning and refrigeration system. Expansion valve is a relatively common component, is widely used in refrigeration system, expansion valve can make the liquid refrigerant at medium temperature and high pressure into low temperature and low pressure wet steam through its throttling, so as to control the valve flow, often installed at the refrigerant inlet of the evaporator.

The working principle of the expansion valve is:

The expansion valve regulates the refrigerant flow according to the amount of superheat of the refrigerant at the evaporator outlet. The thermostatic expansion valve controls the flow of refrigerant into the evaporator by feeling the superheat of the gaseous refrigerant at the evaporator outlet. According to the different balance methods, thermostatic expansion valves are divided into external balance and internal balance type.

It is composed of an induction mechanism, an actuator, an adjustment mechanism and a valve body. During operation, the temperature sensing bag fixed on the outlet pipe of the evaporator senses the superheating temperature of the evaporator outlet, so that the pressure in the temperature sensing package is generated, and the space on the upper part of the diaphragm is transmitted by the capillary tube, and the diaphragm transmits the signal to the thimble (actuator) in an elastic deformation mode under the action of pressure, so as to adjust the opening of the valve and control the flow of refrigerant.

Blockages of thermostatic expansion valves in refrigeration systems are frequent, including dirty blockages and "ice blockages". The main reason for dirty plugging is the presence of impurities in the system, such as welding slag, copper code, iron filings, fibers, etc.

The low pressure pipe does not ice the hand, the drying bottle is frosted, the condenser is frosted, the expansion valve or the condenser can not hear the swishing sound, the high pressure and low pressure are abnormal, and the temperature of the high pressure pipe is abnormal.

The thermostatic expansion valve is installed at the inlet of the evaporator, often referred to as the expansion valve, and has two main functions:

1. Throttling: After the high temperature and high pressure liquid refrigerant is throttled through the throttle hole of the expansion valve, it becomes a low-temperature and low-pressure mist hydraulic refrigerant, which creates conditions for the evaporation of the refrigerant;

2. Control the flow of refrigerant: Once the liquid refrigerant enters the evaporator, the refrigerant will be evaporated into a gaseous state, absorbing heat and reducing the temperature in the car. The expansion valve controls the flow of refrigerant to ensure that the outlet of the evaporator is completely gaseous refrigerant, if the flow rate is too large, the outlet contains liquid refrigerant, which may enter the compressor and produce liquid shock; If the refrigerant flow rate is too small, the evaporation will be completed in advance, resulting in insufficient refrigeration.

The impact of a broken expansion valve in an automobile air conditioner is as follows:

The expansion valve is an important component in the refrigeration system and is generally installed between the reservoir and the evaporator. The expansion valve is composed of three parts: the valve body, the temperature sensing bag, and the balance pipe.

The expansion valve of automobile air conditioner mainly plays the role of throttling and reducing pressure and regulating the flow rate. At the same time, it also has the function of preventing wet compression and liquid shock, protecting the compressor and abnormal overheating.

In the refrigeration system, the expansion valve is one of the four major components of the refrigeration system (compressor, condenser, throttle valve, evaporator). Throttle valves can also be called expansion valves or regulating valves.

From the balance mode, the expansion valve can be divided into two types: internal balance type and external balance type. The equilibrium pressure is taken at the inlet of the evaporator for the internally balanced type, and the equilibrium pressure is taken at the outlet of the evaporator for the externally balanced type.

Internally balanced expansion valves are generally used in household air conditioners. The cooling capacity of automobile air conditioners is generally relatively large, and the pressure loss of refrigerant in the evaporator is also large, so only the external balanced type is used.

From the adjustment structure of superheat, the expansion valve is divided into internal adjustment type and external adjustment type. The internal adjustment type can only be adjusted before the installation of the air conditioning system, and its advantages are that it is small in size and compact in structure, which is suitable for batch stereotyped products.

The externally adjustable type can be adjusted at any time on the air conditioning system according to the situation, which has a great deal of flexibility, but the increase in parts makes it larger in size and weight.

Hello, the air conditioner will appear not to refrigerate!

If the expansion valve is damaged, the temperature difference between the two air conditioning pipes connected to it will be very large, and the temperature difference between the two pipes is generally in a small range. You can touch it with your hands.

If there is moisture in the system of the automobile expansion valve, the refrigeration work of the air conditioner is that there will be ice blockage at the expansion valve, and the air conditioner will not be refrigerated after the blockage, and the ice will melt after running for a while, and the blockage phenomenon will be eliminated, and the air conditioner can be refrigerated.

This depends on the degree of blockage of the expansion valve, the worse the blockage, the worse the refrigeration effect. It can also be judged by high and low pressure data, usually the high pressure is high, the low pressure is low, and the expansion valve needs to be replaced.

The expansion valve in the automobile air conditioning system needs to be diagnosed without dismantling, otherwise the problem cannot be seen after dismantling, and it is recommended to contact professionals for maintenance.

When adding refrigerant, the copper pipe or aluminum inside the automobile air conditioner is oxidized due to poor vacuum pumping or moisture inside the refrigerant, and the oxidation phenomenon is aggravated for a long time, resulting in pipeline blockage. The solution is to turn on the air conditioner and heat the condenser so that most of the refrigerant returns to the evaporator;

After the shutdown, the vacuum pump is used to filter the refrigerant; Disassemble the two pipes at the evaporator, heat the evaporator, pipeline, expansion valve and filter with high-power hair dryer to let the water vapor discharge naturally, and then use nitrogen to remove the water inside the evaporator and pipeline; Close the pipeline, add nitrogen to the system to 10 kg per square centimeter, keep the pressure for more than 2 hours, if the pressure does not drop significantly, the system can be vacuumed to more than negative, and add compressor lubricating oil and refrigerant according to the specified standards; Start the air conditioner and test the working pressure of the evaporator and condenser, detect the leakage of the pipeline, and end the work if there is no abnormality.

Check the temperature on both sides of the expansion valve, the temperature difference is too large, it means that the expansion valve is blocked, and the temperature difference between the two sides of the expansion valve is quite small under normal circumstances. In addition, the expansion valve is blocked and the air conditioner cannot be refrigerated, and the air compressor will stop running due to the system itself after a while.

Judgment method of automobile air conditioner expansion valve failure:

1. At a temperature of 30 degrees, the pressure on the low-pressure side is about 40ps within 10 minutes after starting the air conditioner, and it is normal for the high-pressure side to be around the right.

2. At a temperature of 30 degrees, 10 minutes after starting the air conditioner, the pressure on the low-voltage side is 40ps, and the pressure on the high-pressure side is above, which is a problem of poor heat dissipation.

3. When the temperature is 30 degrees, after starting the air conditioning system for 10 minutes, the pressure on the low-pressure side is between 25ps and 32ps, and the pressure on the high-pressure side is in the most normal state. Increasing the throttle appropriately and the pressure on the low side can drop to 22ps.

4. At a temperature of 30 degrees, the air conditioner has been started for a long time, the pressure on the high-pressure side has not been reached, the pressure on the low-pressure side is about 40ps, and the air-conditioning system has added the calibrated refrigerant but the liquid window is still bubbling. At the same time, there is water on the compressor casing on the low-pressure side of the compressor. Expansion valve body failure.

5. At a temperature of 30 degrees, the air conditioner is started for a long time, the pressure on the high-pressure side is not reached, the pressure on the low-pressure side is about 50ps, and the air-conditioning system is filled with calibrated refrigerant but the liquid window is still bubbling. At the same time, there is water on the compressor casing on the low-pressure side of the compressor. The expansion valve body and compressor failed at the same time.

You can feel if the temperature difference between the two sides of the expansion valve is obvious, if not, then it is very likely that the expansion valve is faulty, the compressor is generally to check the high and low pressure, but sometimes it will not be accurate, because there will be other reasons that cause the same failure, such as water ingress into the air conditioning line.

Touching the suction and exhaust pipe of the compressor, there is a feeling of cool and hot is the failure of the expansion valve, and if there is no compressor string, it is poor gas stringing.

Look at the high and low pressure pressure, if it is almost a compressor failure, on the contrary, the expansion valve.

Looking at the high pressure gauge, the pressure is very high is the expansion valve, and vice versa.

You can judge by looking at the pressure, if the high pressure is very high, the low pressure is very low, and the expansion valve is broken. The high-pressure, low-pressure, and high-pressure compressor is bad, but it must be judged when the compressor is started.

The expansion pressure tease can be used to judge the quality of the expansion valve of the automobile air conditioner. In general, the judgment method of the car expansion valve is broken:

When the temperature is 30 degrees, within 10 minutes after the air conditioner starts, it is normal for the low-voltage side to be around 40ps, and the high-pressure side to be around, otherwise it is a fault.

Check the appearance and judge according to the temperature change of the front and rear pipes of the expansion valve during the operation of the air conditioning and refrigeration system. The expansion valve is damaged if the appearance of the expansion valve is visibly broken, deformed, or damaged. If the refrigeration system can work, check the refrigerant temperature, pressure and the phenomenon in the front and rear pipelines of the expansion valve when the refrigeration system is working, and you can also judge whether the expansion valve itself is faulty.

If the expansion valve is broken, the low-pressure pipe is not cold, and it should be frozen normally. Finger orange.

Here are the reasons for the failure:

1.Blockage of expansion valve: It means that the outlet temperature of the air conditioner in the car is high, the pressure on the high-pressure side is low, and the low-pressure side is in a negative pressure state.

In case of micro-blockage, frost or condensation will appear at the inlet end of the expansion valve; When the expansion valve is clogged, there is no temperature difference between its inlet and outlet. It is recommended to go to a professional 4S shop for maintenance.

2.The expansion valve is too large or fails: the phenomenon is the same as the blockage, and the expansion valve can be removed for repair or replacement;

3.The expansion valve is opened too much: it means that the temperature of the air conditioner outlet in the car is too high, and the pressure on the low-pressure side is too high. It is recommended to go to the repair shop for adjustment according to the specific situation.

The method of judging whether the expansion valve of the automobile air conditioner is normal: you can judge by looking at the pressure, if the high pressure is very high and the low pressure is very low, the expansion valve is broken. If it is broken, it will affect the refrigeration and will freeze, if the valve is not properly adjusted, it will affect the high and low pressure pressure, the air conditioner has no air conditioning, and the low pressure pipe will not ice your hands.

The automobile liquid attack suspects that the expansion valve of the air conditioner is broken, which is manifested as: the low-pressure pipe is not iced, the drying bottle is frosted, the condenser is frosted, the expansion valve or the condenser cannot be heard, the high pressure and low pressure are abnormal, the temperature of the high-pressure pipe is abnormal, and so on are the reasons why the expansion valve is broken or cannot be opened. Judgment method:

1.Hand touch the two ends of the reservoir to take over the temperature, the temperature difference is large and must be replaced2Dirty blockage and ice blockage are generated in the system, and they must be replaced3

The air conditioner is out of service due to a malfunction or has been disassembled for a long time and must be replaced4The reservoir body has a leakage fault and must be replaced5The reservoir pressure control switch fails and must be replacedIn addition to the above cases, the reservoir should work normally, and there is no need to replace it.

Temperature controller: The temperature controller should be able to automatically cut off or turn on the input power of the compressor within the set temperature control system. When the control fails, the temperature sensor of the temperature control should be replaced.

The failure of the expansion valve is generally manifested as the freezing of the low-pressure pipe or the high pressure of the Xun bucket and the grinding force on the side of the mu is too high. The phenomenon of low pressure and high pressure.

This should be judged based on the pressure and temperature, thank you.

The fault judgment of the expansion valve is mainly through pressure measurement, the pressure gauge needs to be connected to the refrigeration system, the engine and air conditioner are started, and the pressure gauge data is observed, the low pressure is normal at 130 to 180kpa, and the expansion valve is faulty before the expansion valve is lower or higher than the Lingsun Qing data.