Rotary vane compressors disadvantages. Rotary vane compressors. The principle of operation of rotary compressors

Suction port seal

This method of changing power by changing the speed of the compressor causes. Energy efficiency is superior to other power control methods because it does not destroy volumetric efficiency, in one frost less one frost limits the overshoot of regulation common to all control systems, or nothing. Value added costs will be quickly amortized by the operating economy. It will no longer be necessary to start the star-delta as the soft start is performed by the drive. A priori, different types compressors can be equipped with this technique, but if it is a matter of grafting the drive onto existing equipment, it will be possible to obtain prior consultation from the manufacturer. This method is also useful for screw compressors, but lubrication problems and motor overheating can occur at low speed. Turning off the cylinder A fairly common method of cutting energy, you can play with turning off the cylinder. To avoid inrush currents, the compressor can be started. This setting is energetically less favorable; the consequence of this is that the machine still absorbs about 65% of the drive power at a cooling power of 50%, for example. The power change is not continuous. the car is almost identical to an empty or loaded one.

• Better efficiency of food storage temperatures.
• Reduced noise and vibration.
• To understand the location of the compensation capacitors, click here!

The cooling capacity is then changed by influencing the flow rate of the refrigerant. Regarding compressor capacity control by injecting hot gases into the evaporator or compressor inlet, this should be called “net energy loss”. In this case, the absorbed power remains unchanged when the refrigerating power is reduced and the engine overheats and, if possible, the system should be shut down in existing installations.

This is a compressor that works by itself, and you can try the following image: the pump rises from the basement of the water to the first floor, and if the water runs out, the pump cavity. It is also important to reduce the flow of water to the basement and pump additional water back to the pump.

The pivot table below is based on an analysis of manufacturer directories of links for positive and negative cooling products. The most common compressors are found in stores, but it should be noted that for most current installations, a semi-hermetic reciprocating compressor is used.

The choice of a high performance compressor is good. Better to place it in a supportive environment. In practice, we will be very attentive to the proposed meetings. "One exchanger one compressor one exchanger". The device forms a chiller, of course, but the pressure losses associated with heat exchangers are sometimes very high for the compressor, which greatly increases its consumption!

It is preferable to choose an overall plant installed in the factory and whose manufacturer guarantees the overall performance. The compressor is the element that forms the core of the refrigerant circuit. It is responsible for circulating the refrigerant inside the circuit, then aspirates it from the evaporator and compresses it, increasing the pressure on the condenser.

Not all air conditioning and refrigeration applications dictate the same requirements as power, noise, efficiency and area of ​​operation, which is why there are several types of compressors. Alternative compressors or pistons, which are divided into hermetic, semi-hermetic, and open, are used primarily in applications with very high refrigeration demand. They have also been used in very low friction applications in the past due to their economics, but have been replaced by rotary compressors.

In this type of compressor, the positive displacement piston compression system is designed and operated in a manner similar to motorcycle emissions. The pistons move alternately inside the cylinders by aspirating and compressing the refrigerant gas. Each cylinder is equipped with a refrigerant suction valve and a supply valve through which the gas is fed into the condenser after being compressed.

Obviously, there is no such thing as a characteristic fuel engine phase. These are usually noisy compressors. They also generate sensitive vibrations that affect the entire circuit. The construction technology, however, is quite simple and well-established, making it the best choice in the past for low cost applications and very low capacity for residential or commercial use. They have now been replaced by rotary compressors, which is better for performance and economy.

Alternative compressors are said to be open when the end of the crankshaft extends beyond the crankshaft and is tested. Although semi-hermetic, when both the actual compressor and the motor are contained in the same enclosure, designed to be open for inspection and Maintenance... In this case, the crankshaft and the crankshaft are one piece. Semi-hermetic compressors are designed to prevent air or dust from entering the mechanism.

Alternative compressors are said to be pressurized when the casing is welded and sealed and the cylinder heads are not accessible for inspection or maintenance. Rotary compressors, including pallet, scroll, screw and centrifugal compressors, are hermetic compressors and are used in a large number applications and operating ranges.

The sump compressor consists of a cylindrical casing, two inlet and outlet openings and a rotor eccentrically positioned relative to the casing. Compression takes place through the passage of the refrigerant into the cavity, which, taking into account the eccentricity of rotation, allows the desired volume reduction to be achieved.

The advantages of a rotary pallet compressor are economy and minimal clutter, which makes it the best choice for small production facilities. The more complex type is the "twin", which has two counterclockwise rotating eccentrics that reduce the noise and vibration generated by these compressors, an alternative that is often preferable to cranking, more expensive and bulky compressors.

The twin rotor also offers improved energy efficiency and the same economy as the traditional version. This made it possible to use it in refrigeration units with high throughput, which have significant results in the industrial field.

Scroll compressors use two scrolls, one fixed and one mobile, connected to the engine. The spirals are located inside each other in order to be in contact with each other at different points and form a series of nail volumes during the course, gradually decreasing as the center is reached. The fluid is then compressed by rotating the movable spiral until it is fixed until it is picked from a central point.

Scroll compressors are widely used in residential and commercial air conditioning systems, heat pumps and air conditioning systems. Among the advantages scroll compressors- relatively small footprint and weight well below the average alternative compressor capacity, even if it is superior to rotary compressors, and also has good compression ratios, which, however, decreases as operating conditions change.

They feature low noise levels and reduced vibrations. Screw Compressors are based on a mechanism consisting of two threaded rotors directed towards each other. As the rotors rotate, fluid is sucked out through the input light, filling the volume between the two petals.

When the interlayer spaces are filled with liquid, the suction stops, the liquid trapped in the vane then forcibly rotates into ever smaller space, which causes compression. When a certain position of the blades is reached, then the compressed liquid is placed in contact with the discharge light and the discharge phase begins, which ends with its complete displacement. These compressors need abundant lubrication due to the rotor's tensile resistance to others. The abundance of lubrication and the subsequent cooling of the oil by means of a special heat exchanger guarantees, however, higher compression ratios than alternative compressors, ensuring good diffusion in both cooling and air conditioning.