The location of the expansion valve of the household air conditioner, and where is the expansion val

In general, there are only inverter air conditioners in household wall-mounted machines or cabinets.

The expansion valve will be used, and if it is a fixed frequency machine, there is no expansion valve. It is usually installed in an outdoor unit and is in the shape of brass.

The middle and end of the column will have two copper pipes at right angles, and the expansion valve on the air conditioning system pipeline is located in the "condenser" from the working principle diagram of the refrigeration system.

and the evaporator".

The normal high-pressure pressure of a household air conditioner should be or 190-250lbf in2), and the normal low-pressure pressure should be between or 20-35lbf in2). It is the refrigerant R22

The pressure corresponding to the circulation in different positions in the air conditioning pipeline, because R22 is cyclically changed between gas and liquid, accompanied by heat absorption and heat release, so the temperature of the external environment has a significant impact on it, in general, the ambient temperature is high, the pressure value becomes larger, and the ambient temperature is low, the pressure value becomes smaller.

There are few electronic expansion valves for household machines, which are generally installed on the external machine, and may be installed on the internal machine if it is a duct type. One external machine with multiple internal machines must have an electronic expansion valve throttling.

Household air conditioners do not use expansion valves, only one capillary tube is used on the outdoor unit.

In general, only the inverter air conditioner will use the expansion valve in the general household wall-mounted machine or cabinet machine, and the expansion valve is not available if it is a fixed frequency machine. Generally installed in the outdoor unit, the shape is a brass column, the middle and end of the column will have two copper pipes at right angles, from the refrigeration system with the working principle of the jujube, the expansion valve on the air conditioning system pipeline is located in the "condenser and evaporator pipeline".

The normal high-pressure pressure of a household air conditioner should be or 190-250lbf in2), and the normal low-pressure pressure should be between or 20-35lbf in2). It is the pressure corresponding to the refrigerant R22 circulating in different positions in the air conditioning pipeline, because R22 is circulating between gas and liquid, accompanied by heat absorption and heat release, so the temperature of the external environment has a significant impact on it, in general, the ambient temperature is high, the pressure value becomes larger, and the ambient temperature is low, the pressure value becomes smaller.

The expansion valve of automobile air conditioning is generally on the condenser mouth, and the thermodynamic expansion valve, also known as the throttle valve, is one of the four major components in the automotive air conditioning and refrigeration system (evaporator, compressor, condenser and expansion valve), which is to sense the superheat of the refrigerant vapor through the temperature sensing element at the outlet of the evaporator, so as to adjust the size of the expansion valve opening, and then control the flow of liquid refrigerant into the evaporator.

The expansion valve of the car air conditioner is generally on the condenser port. The thermodynamic expansion valve, also known as the throttle valve, is one of the four major components in the automotive air conditioning and refrigeration system, such as (evaporator, compressor, condenser and expansion valve), which is to sense the superheat of the refrigerant vapor through the temperature sensing element at the outlet of the evaporator, to adjust the size of the expansion valve opening, and then control the flow of liquid refrigerant into the evaporator.

According to the balance mode of the thermodynamic expansion valve, it is divided into internal balance type and external balance type: the working principle of the internal balance expansion valve and the external balance expansion valve is basically the same, the difference is: the diaphragm of the internal balance expansion valve feels the inlet pressure of the evaporator, and when the pressure drop of the evaporator is too large, the superheat felt by the power head will be reduced, so that the valve opening is insufficient, and the external balance expansion valve diaphragm feels the Dan Qi is the outlet pressure of the evaporator, which avoids the influence of the evaporator pressure drop on the valve opening and overcomes the shortcomings of the internal balance valve.

In addition, the refrigerant flowing through the evaporator will produce a certain pressure loss, most of them from the outlet of the self-expansion valve to the outlet of the evaporator, the evaporation temperature drop corresponding to the pressure drop of the refrigerant is more than 2 3 or so, in order to make the thermostatic expansion valve have a suitable superheat, avoid liquid shock and overheating, it is more reasonable to choose the external balance type thermostatic expansion valve.

<> method of replacing the expansion valve: first put all the only refrigerant in the system pipeline into the outdoor unit pipeline or discharge it, and after the discharge is clean, brazing welds the original thermal expansion valve Qinshan trap. Wrap the body of the new thermostatic expansion valve with a damp towel and braze and weld it.

Finally, vacuum extraction, negative pressure maintenance, and standard amount of refrigerant are filled.

1. The expansion valve on the pipeline of the air conditioning and refrigeration system is on the pipeline between the condensing radiator and the evaporator, close to the inlet of the evaporator.

2. During the working process of the refrigeration system, the expansion valve is used to reduce the pressure of the throttling flow of the refrigerant after heat dissipation and liquefaction, and the refrigerant after throttling and depressurization enters the evaporator to evaporate and absorb heat.

3. Most of the cars are H-type expansion valves, as shown in the following figure

1. Before adjusting the thermostatic expansion valve, it must be confirmed that the refrigeration abnormality of the air conditioner is caused by the thermostatic expansion valve deviating from the optimal working point, not because of freon.

Less, filter drier blockage, filter, fan, belt and other reasons. At the same time, the correctness of the sampling signal of the temperature sensing package must be ensured, and the installation position of the temperature sensing must be correct, and it must not be installed directly below the pipeline, so as to prevent factors such as oil accumulation at the bottom of the pipe from affecting the correct temperature sensing of the temperature sensing package.

2. The adjustment of the thermostatic expansion valve must be carried out under the normal operation of the refrigeration device. by drying the stove in the evaporator.

If a thermometer cannot be placed on the surface, the suction pressure of the compressor can be used as the saturation pressure in the evaporator, and the approximate evaporation temperature can be obtained by checking the meter. Use a thermometer to measure the temperature of the return air duct and compare it with the evaporation temperature to check the superheat.

During the adjustment, if the superheat is too small, the adjusting screw can be rotated in a clockwise direction (that is, the spring force can be increased and the opening degree of the thermodynamic expansion valve can be reduced) to reduce the flow rate; On the contrary, if you feel that the superheat is too great, that is, the liquid supply is insufficient, you can turn the adjusting screw in the opposite direction (counterclockwise) to increase the flow rate. Due to the thermal inertia of the thermodynamic expansion valve temperature sensing system in actual work, the signal transmission lag is formed, and the next adjustment can only be carried out after the operation is basically stable.

3. Specific adjustment steps of the thermodynamic expansion valve.

1.Stoppage. The probe of the digital thermometer is inserted into the insulation layer at the return air port of the evaporator (corresponding to the temperature sensor at the position). Place the pressure gauge.

It is connected to the tee of the compressor low pressure valve.

2.Turn on and let the compressor run for 15After more than a few minutes, it will enter a stable operation state, so that the pressure indication and temperature display will reach a stable value.

3.Read out the digital thermometer temperature t1The temperature t2 corresponding to the pressure measured by the pressure gauge, the superheat is the difference between the two readings t1-t2.

The superheat of the thermostatic expansion valve should be between 5-8, if not, then adjust it appropriately. The adjustment step is to remove the protective cover of the thermostatic expansion valve and then turn the adjustment screw 2-4Circle, wait for the system to run stably, re-read, calculate the superheat, whether it is within the normal range, if not, repeat the previous operation until it meets the requirements, and the adjustment process must be careful and careful.

<> The adjustment step of the air conditioning expansion valve is to remove the protective cover of the thermodynamic expansion valve, and then turn the adjustment and the front whole screw 2-4 turns, and so the system is running stably, re-read, calculate the heat of the royal clearing, whether it is in the normal range, if not, repeat the previous operation until it meets the requirements, and the adjustment process must be careful and careful.

This answer is applicable to most air conditioner models of Gree, Midea, Haier and other shelter brands.

Where is the expansion valve of the car air conditioner? Where is the Yinji automotive air conditioner expansion valve located? The expansion valve of the car air conditioner is generally on the condenser port.

The following is the relevant introduction of the air conditioning expansion valve: 1. Thermal expansion valve: The thermal expansion valve, also known as the throttle valve, is one of the four major components in the automotive air conditioning and refrigeration system (evaporator, compression grinding machine, condenser and expansion valve), which is to sense the superheat of the refrigerant vapor through the temperature sensing element at the outlet of the evaporator, to adjust the size of the expansion valve opening, and then control the flow of liquid refrigerant into the evaporator.

2. Classification: According to the balance mode of the thermodynamic expansion valve, it is divided into internal balance type and external balance type: the working principle of the internal balance expansion valve and the external balance expansion valve is basically the same, and the difference is:

When the pressure drop of the evaporator is too large, the superheat felt by the power head will be reduced, and the valve opening is insufficient, while the diaphragm of the external balance expansion valve feels the outlet pressure of the evaporator, which avoids the influence of the evaporator pressure drop on the valve opening and overcomes the shortcomings of the internal balance valve. @2019

The expansion valve of the automobile air conditioner is also called the throttling device, usually the throttling device of the car air conditioner is assembled in the evaporation box of the evaporator, and at the inlet pipe of the evaporator, there is a kind of orifice type throttle valve, which is assembled in the external pipe of the compartment, which is the same as the inlet pipe of the evaporator. The commonly used expansion valves for car air conditioners include internal and external balance F-type expansion valves, H-type expansion valves, and perforated pipe trouser family transport throttle holes. Damage to the car air adjustable expansion valve includes:

Blockage or throttling failure, resulting in no early or insufficient cooling of the air adjustable refrigeration system. The expansion valve is a common component used in refrigeration systems. The expansion valve can control the flow rate of the valve by turning the medium-temperature and high-pressure liquid refrigerant into low-temperature and low-pressure wet steam through its throttling flow, and is often assembled at the refrigerant inlet of the evaporator.

The basic principle of the expansion valve is to self-regulate the flow of refrigerant according to the temperature of the refrigerant at the outlet of the evaporator. This type of thermostatic expansion valve is rarely used in fluorine machine systems.

Millions of car purchase subsidies.