The compressor is to compress the refrigerant vapor and the conveyor, but also the cardiac compressor refrigeration system, which is a power source for circulating the refrigerant in the system, which suction pipe temperature low-pressure refrigerant gas from the suction, after the motor speed to drive the piston through its compression, is discharged into the exhaust pipe temperature high-pressure refrigerant gas, to provide power for the refrigeration cycle, in order to achieve compression rarr; condensing rarr; expansion rarr; evaporation (heat absorption) of the refrigeration cycle. Usually the compressor by the motor, a cylinder housing, a piston, a control device (initiator and a thermal protection) and cooling system. There are basically two kinds of initiator, i.e. heavy hammer and the PTC-type. The latter is more advanced. There are two kinds of oil-cooled cooling and natural cooling.
1 compressor characteristics
1, are used in each unit microcomputer control system, having a self-diagnosis and protection. The display panel can display the actual functioning of the unit. If the unit fails, the computer control system will respond accordingly depending on the circumstances. Computer control system can prompt the user to make the necessary replacement parts and maintenance, backup unit outputs left the computer system, the input terminal may beMulti-unit interlock control and remote control. 24 hours a day to ensure the security work for you.
2, substituted oil with water, the effectiveness of four to achieve lubrication, cooling, sealing, noise reduction, the percentage of 100 to provide high-quality oil-free air, pollution, bleed water without special treatment, in line with environmental requirements. Due to the action of water, which is the ideal compression isothermal compression, the amount of air per unit of horsepower than the average dry compressor 15 to improve the yield percentage.
3, when the gas consumption reduction system, the system pressure starts to rise, the controller receives the signal pressure increases, it gradually decreases the opening degree of the intake valve, when the compressor discharge with reduced air quantity, of course, the motor current is also reduced. When the system is increased gas consumption, the system pressure begins to decrease, the controller receives the pressure decrease signal, then gradually increase the degree of opening of the intake valve (or even full), then the compressor displacement is also increased with the full output. When continuous gas consumption reduction system, the system pressure rises to the pressure to the empty set, the controller sends the intake valve is fully closed, when the compressor starts running empty.
4, screw machine adopts Japan’s Mitsui single screw water lubricated body, since 1982, listed on the market after nearly two decades of verification, the air quality in energy-saving and high reliability are proved advanced technical quality. Due to the perfect structure itself, creating a completely symmetrical balance compress it less vibration, lower noise.
2. Compressor Category
(a) a positive displacement compressor according to the structure points
1) To a solutionPiston complex: It was first published now present a model of the most widely used, technically more mature, has accumulated a wealth of experience on the production and use, low material requirements, easy processing and low cost. It can accommodate a wider range of pressure and cooling capacity range, high thermal efficiency. The downside is that, due to the reciprocal operation of the piston, the dynamic equilibrium performance is poor, limiting the improvement of the compressor speed, complex structure, multiple wearing parts, maintenance workload. The working volume of the rotational movement of the rotary compressor, without reciprocating mechanism, the dynamic balance of good performance, stable operation, small vibration, has a higher efficiency in its proper operating range.
2) The rotary-piston: light weight, fewer parts, small size, high reliability. However, the rotary displacement of the compressor is small, typically smaller cooling capacity for air conditioning systems.
(b) the internal workings of the air conditioning compressor according to the different points
1) Shake plate type compressor: a shaft, bevel gear, helical-shaped plate, the connecting rod the piston, intake and exhaust valve rocker panels and other components.
2) The swash plate type compressor: a spindle, a swash plate, a cylinder, a piston, intake and exhaust valve.
3) Crank formula: it is a crank, connecting rod, piston, intake and exhaust valves and other components.
(c) The driving source of the compressor points
1) non-independent: a is the main vehicle engine to drive the compressor, this embodiment is adapted to drive automobile spare main engine and compressor power without too much fung models. This drive way small footprint, easy to maintain. But because part of the power consumption of the compressor main engines, can affect the acceleration performance of the vehicle, and the cold air conditioner will vary with vehicle speed.
2), also known as stand-assist type: Since a separate dedicated driver, independently of each other so that between the cars and the cooling effect of the air conditioner. But the drive way to occupy some car space, high cost, noisy, and maintenance support engine complex, it is not wide range of applications. Whether host driver or accessory drive, automotive air conditioning compressor are based on open type, i.e., the compressor power input shaft extends beyond the body, connected by a pulley to the driver. Projecting portion of the body with the shaft seal to prevent leakage of the refrigerant.
automotive air conditioning pressureParticular requirements for the compressor:
The first have a good low speed performance, requires greater cooling capacity of the compressor and high efficiency when the vehicle load and low engine speed.
Low input power of the second car at high speed, so that not only saves fuel, but also reduce the power consumption for the engine air-conditioning area, to improve the vehicle’s own power performance.
to the third compressor size and weight, it saves vehicle space, ease of installation location, and material-saving fuel consumption.
Fourth be able to withstand the harsh operating conditions of the test, a high degree of reliability and durability. When idle, automotive engine compartment temperatures sometimes as high as 80 ℃ high condensation pressure, it is required to withstand high temperature and high pressure compressors and limited overload. Cars on the road there are always bumps vibration, which also requires compressor has a good seismic performance, and the leakage of refrigerant is reduced to a minimum.
The fifth car do not have a negative impact. The compressor requires a smooth operation, low vibration, low noise, small impact on the start and stop of the engine speed, a small starting torque.
3. The compressor driving scheme
two driving the compressor 1.
The two compressors, the mechanical compressor will + electric compressor. Controlled by the controller, in the electric mode, the electric compressor starts, on the contrary, the policy motor drive mode, the mechanical compressor starts.
2. pure electric drive compressor
pure electric vehicles because there is no incentive policy, air conditioning compressor onlyBy the battery-driven, electromechanical system through a compressor adjacent the battery, the battery output converting electrical energy into mechanical energy, and then drive a mechanical compressor. Mediation electromechanical speed through the inverter, thereby adjusting the capacity of the compressor. Compressor technology is very mature, from low to high temperature of the freezer compressor compressor air-source water heater, have successful commercial applications.
3. The compressor drive pulley
System policy mover cars usually direct drive mechanical compressor, directly driven through motive strategy, making the compressor speed and the absolute mover revolution speed to complete the like ratio, therefore, is difficult to control the cooling capacity. The usual practice is to make the variable capacity compressor, which is the variable displacement compressor, a full-fledged, but it will make the compressor complex structure, size and quality are greatly increased.
4. The hybrid compressor driven
uses a compressor through the clutch controller controlling, in a pure electric mode, a battery as a power resource of the compressor, but making the motor drive mode, instigated machine as a power source of the compressor.