Function and classification of automotive air conditioning compressor
1. Cardiac function is the air conditioning compressor for air conditioning systems, whose role is to maintain the flow of refrigerant circulating in the refrigeration system, the low-temperature low-pressure gas refrigerant sucked from the evaporator, to a high temperature high pressure compressed and sent to the condenser.
2. Classification (1) according to different forms of exercise, air conditioning compressor can be divided into reciprocating piston and rotary two categories. Reciprocating piston compressor includes a crankshaft and connecting rod axial piston. Axial piston compressor has two kinds of swing type and swash plate. Can be divided into a rotary compressor, the rotor, screw and scroll four rotary vane (referred to the rotary vane.) (2) when the compressor is working according to volume changes can be divided into fixed and variable displacement type displacement type. Displacement with fixed displacement air conditioning compressor and the engine speed increase, it can not automatically change the size of the displacement according to the cooling load, the fuel consumption of the engine is relatively large influence. Its control is generally collected through the evaporator outlet temperature signal, when the temperature reaches the set value, the air conditioning compressor electromagnetic clutch is disengaged, the compressor stops working; When the temperature rises, the electromagnetic clutch is engaged, the compressor again. Fixed displacement air conditioning compressor is also affected by the pressure of air conditioning and refrigeration control system, when the line pressure is too high or too low, the air conditioning compressor will stop working. Variable displacement air conditioning compressor according to the amount of gas can automatically change the size of the cooling load, the air conditioning system that is more economical to run.
◇ cognitive crankshaft crank linkage rod air compressor compressor air conditioning compressor is the first generation, most currently used in passenger cars in the large displacement air conditioning and refrigeration systems.
1. Structural principle of the compressor with the engine structure is similar to the crankshaft, connecting rod drives the piston reciprocates, the general twin structure, shown in Figure 2-1. Top of each cylinder intake and exhaust valves are equipped with chip
Compressor fitting
2. Compressor crankshaft connecting rod working process of a working cycle consisting of four processes that compression, exhaust, expansion intake. Compression: The refrigerant gas in the cylinder when the intake air rises from the low to the pressure of the exhaust process. Exhaust: refrigerant gas from the cylinder to the exhaust pipe the output process.
Expansion: an open position of the piston moving down from the top dead point to the intake valve during the expansion process is called. Due to the structure and process compressors and other reasons, when the piston moves to top dead center, between the top of the piston and the valve seat a certain gap, the volume of the gap formed called the clearance volume. At the end of the exhaust stroke, since the gap has a certain amount of pressure gas, and then downward when the piston, the exhaust valve is closed, the intake valve can not be opened immediately and the gas can not enter into the inner cylinder tube. When the piston-cylinder pressure down to the slightly lower than the intake manifold pressure, the inlet valve to open. Intake: the intake valve opens, the low-pressure refrigerant gas from the evaporator by the continuous intake pipe and the intake valve into the cylinder until the piston moves to the next process until the ending point.
Cognitive ◇ swash plate compressor air conditioning
1. Structural principle axial swash plate compressor is a reciprocating piston compressor, the principle shown in Figure 2-3. The main components of the spindle and the swash plate compressor shaft of each cylinder to the center circle layout, the spindle piston movement direction parallel with the air conditioning compressor. This compressor is usually arranged in the circumferential direction of the body 5 has a two-way cylinder and a piston 5, each cylinder has two intake valves and exhaust valves.
2. Operation when the spindle is rotated, along with the rotation of the swash plate, the swash plate driving all the pistons reciprocate axially, the leftward movement of the piston, the rightward movement of the piston. When one of the piston movement to the left, the left side space of the piston is reduced, the refrigerant is compressed, the pressure increases, the exhaust valve opens, the refrigerant is discharged, while the right space of the piston increases, the pressure decreases, into the valve opens, the refrigerant into the cylinder. When the spindle revolution, bi-piston front and rear ends of the respective completion of intake, compression, exhaust, the expansion process, the equivalent of two cylinders working.
auto compressor parts
Cognitive swing type air conditioner compressor 1. Structural features shown in Figure 2-4, the cylinder axis of the compressor to the center, evenly distributed, and Wobble piston connecting rod ends using spherical universal coupling, the axial piston pendulum swing and plate coordinated move without interference occurs. Pendulum support for the center of the disc with the center of the ball and limit the swinging of the wobble plate can not rotate with a pair of bevel gears fixed. 2. When the compressor operation, the drive spindle drive wedge plate rotate together. Due to the rotation of the drive plate wedge, forcing the wobble plate to swing the ball around as the center moves. There are needle bearings, variable sliding friction to rolling friction, so although there is still some friction, under the action of friction, there are rotating Wobble Wobble trends and wedge between the drive plate, but this trend is a pair of bevel gears limits can move around so that the wobble plate and the drive piston reciprocates within the cylinder. Compressors such as the crankshaft connecting rod, both the intake and exhaust valve, also has a duty cycle of compression, exhaust, expansion, four intake process.
Rotary vane air conditioning compressor cognitive rotary vane compressors are rotary compressor. Rotary vane compressor is essentially no clearance volume, the work process only the intake, compression and exhaust three processes, so it is much higher volumetric efficiency than reciprocating compressors, in recent years has been widely used in automotive air conditioning on. 1. Structural characteristics of rotary vane air conditioning compressor cylinder has two kinds of round and oval, shown in Figure 2-5. In the circular cylinder, the center of the rotor shaft and the cylinder has an eccentricity of the rotor close to the surface of the cylinder intake and exhaust vent between the work of the uneven rotor. In the oval cylinder, rotor shaft and center of the ellipse coincide, the work force balanced rotor. 2. In the operation of a number of blades mounted on the impeller, and the body of several sealed space is formed, is mounted on the suction hole of the body, and an exhaust vent valve, when the impeller rotates, the volume of the sealing space will change, thus completing the intake, compression and exhaust process. Rotary vane air conditioning compressor suction valve, volumetric efficiency is particularly high, widely used in automotive air conditioning compressors.
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