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Rotary Compressor

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What is Rotary Compressor

 

The rotary compressor is a new type of compressor. Its motor does not need to convert the rotational motion of the rotor into the reciprocating motion of the piston, but directly drives the rotary piston to rotate to complete the compression of the refrigerant vapor.

 

What are Advantages of Rotary Compressor

Simplicity and Robustness

Rotary compressors, with their simplistic design, have fewer components that might fail. Due to their simple design, they are easier to repair, reducing downtime during maintenance.

 

Cost-effectiveness

Not just in terms of initial investment, their reduced complexity often translates to cheaper replacement parts and easier availability, ensuring that long-term maintenance costs remain in check.

 

Performance in High-temperature Environments

While many machines falter in extreme temperatures, rotary compressors thrive. Their design, often more mechanical than electronic, ensures they don't easily get affected by temperature extremes.

 

 

 
What are the Applications of Rotary Compressor
 
01/

Air Compressors
Rotary compressors are used to manufacture compressed air systems, which compress air to a certain pressure to supply pressure to car tires, paint spray systems and other related systems.

02/

Refrigeration and Air Conditioning Systems
Rotary compressors are the core components of commercial and industrial refrigeration and air conditioning systems. They use rotary motion to compress the refrigerant to a high pressure and then push it to the evaporator in the system.

03/

Industrial Manufacturing
Rotary compressors are used to manufacture systems including various mechanical parts such as pipes, molds, plastic molding and evaporators.

04/

Medical and Scientific
Rotary compressors are used in some scientific experiments and medical equipment such as X-ray machines and MRIs.

 

Components of Rotary Compressor
 

Compressor Body
The compressor body is the main body part of the compressor and the basis of each part. The compressor body is usually made of cast iron or cast steel materials and has a stable shape and mounting interface to adapt to motors of different sizes and powers.

 

Control System
The control system of the compressor contains various sensors, instruments and controllers, which can monitor and control the operating status of the compressor to ensure that the compressor works under safe and efficient conditions.

 

Motor
The motor is the power source of the compressor. It is mainly composed of the motor body, motor bracket and connecting parts. The type and power of the motor are closely related to the size and working requirements of the compressor.

 

Cylinder
The cylinder of the compressor is one of the most important parts. It is usually made of high-strength alloy materials to withstand the high-pressure gas pumped by the compressor and has good sealing.

 

How to Choose Right Rotary Compressor

 

DC Inverter Compressor

Evaluate Compressor Size and Capacity

Rotary compressors come in various sizes and capacities. It’s crucial to choose a compressor that aligns with the size of your operation. An oversized compressor may lead to excessive energy consumption, while an undersized one may struggle to meet demand.

Rotary Compressor For Air Conditioner

Consider Operating Pressure

Different applications require different operating pressures. Ensure that the rotary compressor you choose can provide the necessary pressure for your tools and equipment.

Rotary Compressor R32

Maintenance Requirements

Understanding the maintenance needs of the compressor is essential for keeping it in peak condition. Choose a compressor with user-friendly maintenance features, easy access to components, and a clear maintenance schedule. Regular maintenance will prolong the life of the compressor and ensure consistent performance.

 

Maintenance Tips for Rotary Compressor
 

 

Regular Inspections
Look for leaks, check oil levels, and listen for any unusual noises to catch potential issues early.

 

Keep Clean
Keeping the compressor clean can improve its operating efficiency and extend its service life. Clean the surface of the cooler and condenser regularly to avoid the accumulation of dust, dirt and oil. Clean the surface of the compressor housing and other accessories regularly to avoid the accumulation of dirt that affects normal operation.

 

Pay Attention to Lubrication
Regular lubrication control is an important part of compressor maintenance, and attention should be paid to the selection and replacement cycle of lubricating oil. Lubricating oil should choose appropriate oil and brand according to the conditions of use. The lubricating oil replacement cycle is selected according to the use time and lubricating oil quality.

 

Adjust Fasteners
During use, the fasteners of the compressor and connecting pipes are prone to loosening and deformation, and should be adjusted regularly. Check whether there are cracks, deformation or friction marks on the parts connected to the fasteners, and replace them in time if there are any. Check whether the nuts of the fasteners are loose or missing, and tighten them if there are any.

 

FAQ

Q: What are the structural differences between a scroll and a rotary compressor?

A: A rotary compressor’s compression chamber is located at the bottom of the compressor, whereas in a scroll compressor, it is located at the top. A scroll compressor can further be divided into smaller subcomponents such as a fixed scroll, an orbiting scroll, a motor, bypass valves, a thermal protector, an internal pressure relief valve, a discharge check valve, an overload protector, etc. Components such as a thermal protector, internal pressure relief valve, discharge check valve, and overload protector protect the compressor from potential damage. On the other hand, a rotary compressor consists of a cylinder, an accumulator, a main bearing and a sub-bearing, a crankshaft, a roller, and a vane. It can easily be observed that a rotary and a scroll compressor do not share any components except for a motor.

Q: What is the difference between the compression mechanism of scroll compressors and rotary compressors?

A: In a scroll compressor, compression of the refrigerant takes place inside the scroll wrap with the help of scrolls. In contrast to this, a rotary compressor compresses refrigerant inside its compression chamber with the help of the rotary motion of the roller and vertical movement of the vane. A scroll compressor compresses continuously, but refrigerant is only compressed on completion of one rotation in a rotary compressor.

Q: What are the disadvantages of rotary compressors?

A: The primary disadvantages of rotary compressors include higher initial costs and more complex maintenance requirements due to their intricate design. They also tend to be less efficient at lower speeds.

Q: What is the working principle of rotary compressor?

A: Rotary compressors achieve gas compression through continuous rotary motion. Gas enters the compressor through the inlet port as the rotor’s rotation generates space for its entry. As the rotor turns, the gas becomes trapped between the rotor’s lobes and the compressor housing, leading to compression. The compressed gas is then discharged through the outlet port as the rotor’s rotation continues. The continuous rotary action results in a smoother compression process, making rotary compressors suitable for applications requiring stable and uninterrupted operations.

Q: What are the advantages of rotary compressors in terms of space utilization?

A: Rotary compressors have a compact and lightweight design, which makes them ideal for installations with space restrictions. Their streamlined construction allows for more flexibility in positioning and is favored in settings where efficient space utilization is a priority.

Q: Why do rotary compressors have accumulators?

A: The compressor compresses the low-temperature, low-pressure refrigerant gas that has passed through the evaporator (which discharges cold air) into a high-temperature, high-pressure gas. The refrigerant that has passed through the evaporator should be a low-temperature gaseous state refrigerant, but in some situations, the refrigerant in a liquid state may not evaporate and might reach the compressor in the liquid state. If the compressor tries to compress a liquid refrigerant, it causes damage to the system. To prevent the compressor from this damage, an accumulator with an appropriate capacity is selected when designing a compressor. The refrigerant from the evaporator is not directly sucked into the compression chamber of the compressor; instead, it passes through the accumulator first. The accumulator helps the liquid refrigerant evaporate before being sucked into the compression chamber.

Q: How does the motor function?

A: The motor consists of a stator and a rotor. It receives electrical energy from an outside source and converts it into kinetic energy required by the compression chamber of the compressor to compress the refrigerant.

Q: What should be checked when checking a rotary compressor?

A: Check whether the fasteners of the compressor and the connecting pipes are loose or slipped, especially when working continuously.
Check whether the electrical circuits are intact, especially the connection between the relay and the fuse.
Check whether there is dust, dirt and oil on the surface of the cooler and condenser, and clean them if there is any.
Check the oil level and quality of the compressor, and pay attention to whether the color of the oil has turned black and whether the oil contains excess water.

Q: What should be paid attention to when adjusting the temperature of a rotary compressor?

A: When adjusting the temperature of the rotary compressor, you need to pay special attention to its working state to avoid damage to the compressor due to improper operation.
When adjusting the temperature, you need to preheat it first to avoid overloading the compressor.
Regularly check and maintain the cooling system to ensure its normal operation and avoid temperature adjustment failure.
When adjusting the temperature, you need to make adjustments according to the actual situation, such as adjustment range, adjustment method, etc., to achieve the best adjustment effect.
If you find that the compressor is working abnormally or the temperature adjustment effect is not good, you should stop using it immediately and seek help from professional technicians in time.

Q: What are the temperature adjustment steps for rotary compressors?

A: First, the required temperature range and temperature adjustment amplitude need to be determined. Secondly, for situations where the temperature adjustment amplitude is large, it is necessary to adjust gradually to avoid damage to the compressor during the transition process. Next, it is necessary to check the working status of the cooling system to ensure its normal operation and clean and maintain the condenser and evaporator. Adjust according to the required temperature. If you want to lower the temperature, you need to increase the cooling capacity of the cooling system, such as increasing the evaporative coolant in the evaporator; if you want to increase the temperature, you need to reduce the cooling capacity of the cooling system, such as reducing the condensing agent in the condenser. After the adjustment is completed, it is necessary to check the working status of the cooling system again to ensure its normal operation.

Q: What is the temperature regulation principle of a rotary compressor?

A: A rotary compressor is a highly efficient compressor that can achieve high-efficiency compression work in a small volume. Temperature regulation is an important part of using a rotary compressor. During the temperature regulation process, it is necessary to achieve temperature regulation by changing the operating parameters of the compressor. The principle of temperature regulation of a rotary compressor is to increase or decrease the heat in the compressor by changing the inlet and outlet temperatures of the compressor's cooling system (condenser, evaporator) to achieve the desired temperature regulation effect.

Q: What is the difference between a reciprocating compressor and a rotary compressor?

A: The rotary compressor is more efficient, but it is easier to stick the shaft and get stuck in the cylinder. The reciprocating compressor has a longer working time and is prone to wear, knocking, and dislocation. The rotary compressor is mainly composed of an eccentric shaft, a rotary piston, a cylinder, and a vane. The rotary piston is in an eccentric position relative to the center line of the cylinder. A crescent-shaped base circle space is formed between the air hole in the cylinder and the rotary piston, and the vane is tightly pressed against the rotary piston under the action of the spring force. When the piston rotates, the volume of the crescent-shaped space gradually changes accordingly. The shaft of the reciprocating compressor is elbow-shaped and has no connecting rod mechanism. Its piston is different from the general piston. Instead, a short tube with an oblong hole is welded in the vertical direction at the lower end of the piston so that the cylindrical slider can be installed at the end of the crankshaft. When the crankshaft rotates, the slider is driven to slide left and right in the short tube at the lower end of the piston, causing the piston to reciprocate.

Q: What is the role of lubricating oil in rotary compressors?

A: Lubrication: Reduce mechanical friction and wear.
Lower temperature: Lubricating oil circulates continuously in the refrigeration compressor, so it also continuously takes away a lot of heat generated during the operation of the refrigeration compressor, keeping the machine at a lower temperature, thereby improving the mechanical efficiency and reliability of the refrigeration compressor.
Sealing: Lubricating oil is also used for the sealing of each bearing and the sealing between the cylinder and the piston, improving the sealing performance of the shaft seal and the piston ring, and preventing refrigerant leakage.
As the power of the energy regulating mechanism: The oil pressure of the lubricating oil is used as the power of the energy regulating mechanism in the refrigerator to automatically or manually adjust the cooling capacity of the refrigerator.

Q: How to extend the service life of rotary compressors?

A: Maintenance
Regular maintenance and servicing of the compressor, timely replacement of wearing parts, and keeping it in a good clean state can extend the service life of the compressor.
Use high-quality parts
Choosing high-quality parts for replacement can not only increase the service life of the compressor, but also improve the efficiency and stability of the compressor.
Proper use
Reasonable operation methods and considerate use, such as avoiding overload operation, strictly controlling the compression ratio, ensuring sufficient cooling, etc., can extend the life of the compressor.
Appropriate update
With the increase of use time, the performance of the compressor will gradually decline and its life will also be affected. Timely updating of the compressor can improve production efficiency, reduce energy consumption, and extend the service life.

Q: What are the factors that affect the life of rotary compressors?

A: Quality. The quality of the compressor is one of the main factors affecting its life. High-quality compressors have better craftsmanship, higher quality standards and a more complete guarantee system, and their service life is longer.
Use environment. The use environment is another important factor affecting the life of the compressor. In a humid, corrosive, dusty or high temperature environment, the parts of the compressor are easily damaged and the life span will be shortened accordingly.
Use conditions. Use conditions are one of the most important factors affecting the life of the compressor. Too high or too low compression ratio, too high or too low cooling water temperature, unreasonable operation methods, etc. will shorten the service life of the compressor.

Q: What is the structure and function of the rotating element of a rotary compressor?

A: The rotating element of a rotary compressor is mainly composed of two intermeshing rotors, which are called the main rotor and the slave rotor. The main rotor is equipped with a rack on the axial direction, while the gear of the slave rotor rotates under the internal drive. By intermeshing, the two rotors can twist and move, thereby achieving compression.

Q: What are the main components of a rotary compressor?

A: A rotary compressor is mainly composed of a compressor body, an air filter, an exhaust pipe, a control system, etc. Among them, the compressor body is the core component of the rotary compressor, including a stator, a rotor, an air inlet, an exhaust port, a cooling system, etc.

Q: What is the impact of high temperature environment on rotary compressors?

A: Decreased cooling effect
High temperature will make the heat dissipation effect of the radiator worse, thereby increasing the temperature inside the compressor. This will cause over-condensation of the evaporator and over-compression of the condenser, thereby reducing the working efficiency and cooling effect of the entire refrigeration system.
Decreased lubrication effect
Under high temperature environment, the viscosity of the lubricating oil will decrease, and it will not be able to effectively lubricate the moving parts inside the compressor, which will cause noise, increased wear and increased loss.
Increased power consumption
Under high temperature environment, power consumption will increase due to the increase in the working pressure inside the compressor, which will increase the energy consumption of the machine, thereby affecting the energy saving effect and service life.

Q: What are the advantages of rotary compressor frequency conversion technology?

A: Energy saving and consumption reduction: The compressor frequency conversion technology can achieve precise adjustment according to the system load, avoiding the waste of long-term high-power operation and greatly reducing energy consumption.
Stable and reliable: By controlling the operating frequency of the compressor through the inverter, the machine vibration, noise and other problems caused by the impact load during the operation of the compressor can be avoided, thereby ensuring the stable and reliable operation of the equipment.
Improve control accuracy: The compressor frequency conversion technology can achieve precise control of the system temperature and improve the system control accuracy.
Extend equipment life: Due to stable and reliable operation, the compressor frequency conversion technology helps to extend the service life of the equipment.

Q: What are the application areas of rotary compressor frequency conversion technology?

A: Cold chain: Cold chain transportation has high requirements for ambient temperature and humidity. The compressor frequency conversion technology can improve the efficiency and accuracy of cold chain transportation equipment and reduce the deterioration rate of goods.
Refrigeration: In refrigeration equipment, the use of compressor frequency conversion technology can improve the efficiency of the equipment, reduce energy consumption, and achieve the purpose of energy saving.
Air conditioning: The air supply volume of the air conditioning system needs to be adjusted accordingly with the changes in the indoor environmental load. The use of compressor frequency conversion technology can achieve adjustment and increase the operating efficiency of the air conditioner.

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