FAQ

Air compressors are mainly categorized into piston air compressors, screw air compressors and centrifugal air compressors. One of the reasons for the high maintenance cost of air compressors is the replacement of wearing parts. From the perspective of wearing parts and maintenance to compare the three forms of air compressors, piston compressors have the most wearing parts, piston movement leads to the inevitable wear and tear of many parts, these parts should be replaced regularly, the number of parts is the largest, and the amount of maintenance.

Centrifugal compressors should be configured to speed up the speed changer, the size of the large, more parts, maintenance is also more troublesome, maintenance costs are also relatively high.

Screw compressors have the least wearing parts,can run maintenance-free for several years, the maintenance cost is the least, so screw air compressor is more and more popular.

Our factory supports customized service, you need to tell us the application scenario of the air compressor and your customized requirements in detail, such as the use environment, required pressure, exhaust volume, motor power, component brand requirements, etc., we can design and manufacture according to the requirements you provide, customized products need additional design and manufacturing time and cost, you need to tell us the estimated delivery time and budget, so that we can adjust the Supply Chain.

We will arrange professional engineers to design and keep communicating with you after we receive the specific requirements, the customized products will undergo strict quality control and testing during the production process to ensure that the products delivered to you fully meet your requirements.

Our company designs and produces high quality screw air compressors, which are durable and reliable, and their service life can reach more than 10 years if you maintain them regularly and use them properly.

Please follow our product manuals for proper operation and regular maintenance, such as regular replacement of air filters, oil filters, oil-air separators, lubricants, etc., to keep your air compressor in the best operating condition. If you have additional special requirements and operating conditions, we can provide advice and support.

We believe and promise that with our high quality products and professional services, the air compressor you purchase can realize the longest service life and optimal performance.

Lubricating oil: the replacement cycle depends on the intensity of use of the compressor and environmental conditions, it is recommended that in the first 2 years of operation of the compressor, every 3-6 months to take oil samples to analyze in order to determine the replacement cycle; the initial operation of 500 hours need to replace the lubricating oil; under normal circumstances, every 3,000 hours to replace the system every 2 years of use to do a system cleaning, if the use of harsh environments, according to the circumstances of the shortened replacement cycle; The oil filter must be replaced at the same time when the oil is changed.

Oil filter: replace at the same time with lubricating oil.

Air filter: check and clean the air filter for the first 500 hours of operation, and replace it immediately if it is found to be broken; under normal circumstances, clean it every 1500 hours and replace it every 3000 hours. If the use environment is harsh, shorten the replacement cycle according to the situation.

Oil-air separator: make sure the system is free of pressure when replacing. The replacement cycle depends on the use conditions and oil quality. Under normal circumstances, replace it every 3000 hours and do a system cleaning every 2 years of use; if the use environment is harsh, shorten the replacement cycle according to the situation.

Cooling system: the cooler should be cleaned regularly, under normal circumstances, at least once a year to maintain cooling efficiency.

Safety valve: test it at least once a year to make sure it works properly.

In order to ensure the separation effect, there are at least two points in the design of the oil and gas separator: one is the design of the eccentric inlet, so that the oil and gas mixture flows along the wall after entering the separator, and a large amount of liquid gathers at the wall, which is what everyone calls cyclone separation; Secondly, the separator is equipped with an oil-air separator cartridge with a precision of 1μm level. Suspended oil particles pass through the filter cartridge, are intercepted by the filter material, accumulate into large oil droplets, and then gather at the bottom of the cartridge, and then return to the lubricant system in the header through the return pipe in the concave area, which can filter out almost all the oil droplets in the air path.

Permanent magnet frequency conversion motor, abbreviated as PM VSD motor or PM inverter motor, is the most advanced type of motor used in the air compressor industry at present.

This kind of motor does not need reactive excitation current, which can significantly improve the power factor (up to 1, or even capacitive), reduce the stator current and stator resistance loss, and there is no rotor copper consumption in stable operation, which in turn can reduce the fan (the fan can even be removed for small-capacity motors) and the corresponding wind friction loss, and its efficiency can be increased by 2~8% compared with the same specification ordinary frequency conversion motor.

Moreover, the PM VSD motor adopts rare earth permanent magnet material  , while the ordinary frequency conversion motor is an ordinary three-phase asynchronous motor.

The PM VSD motor can maintain high efficiency and power factor within the range of 25% to 120% of the rated load, and the frequency is automatically adjusted to change the power of the motor, which better matches the output power of the motor, and the effect of energy-saving is more obvious in the operation, and the efficiency of the working efficiency is higher than that of the same power of the ordinary frequency conversion motor by an average of 5% to 7%.

Permanent magnet motors do not require bearings and do not need to add lubricant, eliminating points of failure and have lower maintenance costs.

The PM VSD screw air compressor   is driven by a special frequency converter, the starting current is very small, which has a good protection for the motor, and the motor is not easy to be burned.

Frequency converter is one of the most important parts of the permanent magnet frequency conversion air compressor (also called PM VSD air compressor), which plays a very important role, especially the multiple protection of the motor, which can guarantee the stability and efficiency of the PM VSD air compressor to run on high ground. Then the frequency converter specifically has those main roles? Our company summarized the following five points:

1. Over current and overload protection

The inverter will monitor the motor current in real time ,When there is a sudden surge in the current of the motor, once the current exceeds 120% of its rated current and lasts for 1 minute, or exceeds 150% of its rated value and lasts for 3 seconds, or exceeds 200% of its rated current and lasts for only 10 microseconds, the inverter reacts quickly by shutting down the motor to protect it from overloading.

2. Short circuit protection

Short circuits are one of the common faults in electrical systems, and inverters are also designed with short circuit protection . When a short circuit occurs in the output of the inverter, it causes a sharp rise in current, and the inverter stops within 10 microseconds to prevent damage to the motor from the short circuit.

3. Ground protection

Ground protection, which is also called ground fault protection , is an important function of the inverter. It is equipped with a special ground protection circuit that alerts the inverter when one or both phases of the motor are grounded. If the user has special requirements, the inverter can also be designed to shut down immediately in the event of a ground fault, thus maximizing the safety of the motor and the entire system.

4. Voltage protection

The inverter can detect the output voltage and automatically adjusting it if necessary to prevent the motor from being subjected to excessive voltage. If the output voltage regulation fails or exceeds 110% of th

One of the most frequent failures of screw air compressor in operation is the motor overload of the air end, why does this situation occur? VIBRANT Machinery Co., Ltd has summarized the following 5 reasons based on years of experience in the field:

1. Oil-gas separator clogging

If the oil separator cartridge is clogged, the internal pressure is high, the load is high, and the current becomes high so it will be overloaded. Many people will think that the new oil filter element will not be clogged, in fact, this idea is wrong, with the air compressor working environment and working time has a great relationship.

2. Under voltage

The normal operating rated voltage of the screw air compressor is 380 V, which can go up and down by about 5%.Here is the voltage when the air compressor is working normally, the transformer is relatively small, the voltage has 400 V when the equipment is not turned on, but as soon as the device is switched on the voltage drops to 350 V, and when it runs normally, the voltage is only 360 V. Short-term use is not a big problem if long-term use can cause great damage to the electrical system.

3. Loose wiring

Check the screw air compressor power cord for signs of heat and scorching, mainly checking the three-phase power inlet and motor inlet. If there is any loose or short circuit, deal with it in time.4. The unit pressure of the screw air compressor exceeds the rated pressure.

For example, a 0.8 MPa machine is prone to overloading when the actual pressure reaches 0.85 MPa. Customers are advised to acquire the right machine for their needs and use the equipment in a compliant manner.

5. Screw air compressor contactor failure

The screw air compressor contactor contacts are aged, poorly suctioned, and the contact surface is small, resulting in high current. The electrical system can easily be burnt out in this situation.

Variable frequency screw air compressor is one of the important equipment in modern industrial production, its stable operation and performance optimization are very important to achieve efficient production. Pressure regulation is a key operation in the operation of variable frequency screw air compressor , which not only affects the working efficiency of the equipment, but also directly relates to the stability of production. Our company introduces the pressure adjustment method of frequency conversion screw air compressor in detail to help operators better grasp this key technology.

1.Adjust pressure by control panel

Variable frequency screw air compressor is usually equipped with a control panel , through the panel buttons and display screen, you can easily set and adjust the parameters of the compressor. Among them, pressure regulation is one of the common control parameters.

The specific operation process is as follows:

(1) Open the control panel and enter the pressure adjustment menu.

(2) Select the pressure value to be adjusted and press the confirm button.

(3) After a period of time, the control panel will display the change of pressure in real time.

(4) If you need to adjust several times, you can repeat the above steps.

Pay attention: When adjusting the pressure, it should be set according to the actual demand, such as the pressure range required by the production process. At the same time, in order to ensure the stability of the air system, it is also necessary to set the upper and lower limits of the pressure to avoid losses due to out-of-range.

Smart control pannel for air compressor

2. Modify the parameter value to adjust the pressure

In addition to adjust pressure through the control panel, the pressure can also be adjusted by modifying the parameter values. In this way, the operation parameters of the compressor need to be understood and mastered.

The specific operation process is as follows:

(1) Open the Control panel and find the parameter Settings menu.

(2) Locate pressure-related parameters, such as output pressure, upper pressure limit, lower pressure limit, etc.

(3) Modify the parameter value so that it reaches the desired pressure value.

(4) Wait for a period of time to observe the change in pressure.

Pay attention: When modifying parameter values, do not set the pressure to a value greater than the compressor can withstand. At the same time, improper modification of some parameter values may affect other performance indicators of the compressor, such as energy consumption and noise.

3. Monitor and protect the compressor

In order to ensure the stable operation and work of the variable frequency screw air compressor, measures need to be taken to monitor and protect the pressure.

The specific operation process is as follows:

(1) Install pressure sensors and control devices to monitor changes in pressure in real time.

(2) Set the upper and lower limits of pressure to limit and protect the pressure.

(3) Regularly check and maintain the compressor to ensure its normal operation. (4) Analyze and optimize the energy consumption of the compressor to reduce energy consumption and cost.
Summary: The pressure regulation of variable frequency screw air compressor is a very important operation, and the operator should pay attention to skills and related issues. Through reasonable operation and monitoring, accurate adjustment and stable control of pressure can be achieved, thereby improving the efficiency and performance of the compressor.

Air compressors often need to work in high pressure environments. Sometimes single-stage compression is difficult to meet the requirements of high pressure, then it is necessary to use graded compression, that is, bipolar or multistage compression. What are the benefits of graded compression? VIBRANT Machinery Co.,Ltd summarizes the following three points:

1. Graded compression can significantly improve the volume utilization rate. During the operation of the air compressor, there is inevitably a clearance volume in the cylinder, which not only reduces the effective volume of the cylinder, but also may lead to the expansion of the residual gas, further reducing the effective volume. Especially in the case of high-pressure ratio, the gas expansion in the clearance volume is more severe, which may lead to a significant reduction in the effective volume of the cylinder, or even to zero.

The use of graded compression, each stage of the compression ratio is relatively small, the expansion of the gas in the residual volume of the effective volume of the impact is relatively small, thus improving the utilization of the cylinder volume.

2. Graded compression helps to save power consumption. By setting an intermediate cooler between stages, the compressed gas is first cooled isobaric after one stage of compression, and then enters the next cylinder after lowering the temperature, this design not only reduces the load of the next stage of compression, but also improves the compression efficiency and saves power consumption. As the number of stages increases, the amount of power saved increases, bringing multistage compression closer to the ideal of isothermal compression .

3. Graded compression also helps reduce operating temperatures. The discharge temperature of a compressor increases with the compression ratio and excessive discharge temperatures may cause damage to the equipment. The use of graded compression can effectively reduce the compression ratio of each stage, thus controlling the exhaust temperature within a reasonable range and avoiding overheating and damage to the equipment.

However, there are some shortcomings in graded compression.

For example, a high number of internal parts in a multi-stage compressor may lead to an increased probability of problems during operation. Therefore, when choosing whether or not to use graded compression, factors such as equipment performance, maintenance costs, and stability need to be considered.