The car compressor replaces the hand and foot pump for inflating the tires. The most pleasant advantage of this device is that it is fully automated and no physical effort is required to inflate the wheel. Convenient when the compressor is always at hand, wherever you are. However, it happens that it breaks down and then repairs may be required.
Why is the compressor a necessity for the driver today? After all, there are so many service stations and tire changers around where you can pump up tires and, if necessary, make other repairs. It's simple. The wheel can be lowered anywhere, for example, in a mountainous area or in a summer cottage, far outside the city - there is not always a specialized workshop nearby. And then, it is better not to lose control over the situation and fix the problem on your own, quickly, without extra spending and hassle.
Reasons for compressor breakdown
The most common cause of a car compressor malfunction is a banal blown fuse. The fuse of the block or the one located on the wire may burn out. Such a breakdown is not serious and is repaired very quickly. Moreover, spare parts for repairs can be bought in almost every store, for example, here exist.ua.
Also, one of the options in which the compressor fails involves damage to the power wire. It is very easy to define this nuisance. It is enough to visually examine the wire and find the place of tear or break. This problem can also be dealt with easily and quickly, for sure every man changed the plug on the iron wire.
There are more serious reasons for inoperability. car compressors... For example, when a winding of an electric motor or a vibration coil catches fire, it is rarely possible to save a patient.
If you find that the compressor turns on, but does not give the desired action, that is, it does not pump air, look for a problem in the wear of the piston or PTFE ring. In this case, it will be cheaper to purchase a new autocompressor than to repair and buy new parts.
But more often than not, the problem is not acute and requires little intervention, replacement of a spare part or component. Usually this is a leaky hose, a valve worn on the nipple of a wheel, a rubber ring-gasket, brushes, nozzles.
Features of autocompressors
Due to the fact that the car compressor has various attachments, it can be used not only to inflate the tires of a car, but also for balls, inflatable boats, bicycles, etc. That is, a compressor plus nozzles is a universal device that allows you to solve several problems at once.
In order to repair a compressor, it is important to know its structure and features. So, each representative of automotive compressors is equipped with:
- Electric motor;
- Pressure gauge;
- Cylinder;
- By piston;
- Other accessories (cables, brushes, gaskets, nipple, attachments).
Diaphragm and reciprocating compressors are distinguished by their design.... The principle of operation of a membrane compressor is gas compression, due to the fact that the translational movement of the membrane reduces the volume of the chamber. The diaphragm, sandwiched between the cylinder and the cover, begins to vibrate and acts like a piston.
Piston compressors are equipped with a special piston, which, when connected to the crankshaft, sucks in air masses. They are much more popular with car enthusiasts.
To provide the highest pressure, reciprocating compressors operate in staged mode. Thus, the compressed air mass is distilled from one cylinder to another by means of a cooling tube. The volume of one cylinder is deliberately larger than the second, but the latter compresses the air, increasing the efficiency of the device.
Weaknesses of the diaphragm compressor
The weakest part of diaphragm compressors is the diaphragm. If foreign particles accumulate in the gas cavity of the unit. Important aspects work with such a compressor are:
- Keeping the block clean.
- Elimination of moisture and dirt from entering the membrane unit.
- Timely replacement of spare parts (membrane, gas valve, pressure limiter).
Weaknesses of a reciprocating compressor
The most common problems with a reciprocating compressor are:
- The compressor refuses to start;
- There is no air discharge into the receiver, although the motor is running;
- Knocks out the fuses;
- Air pressure drops sharply;
- Incorrect operation of the thermal protection machine;
- The humidity of the air supplied by the compressor is increased;
- The motor runs at increased vibrations;
- The connection between the hose and the nozzle is frayed and the air is poisoning.
What to do if the compressor won't start
If the device refuses to work, you need to perform certain diagnostic actions using an indicator screwdriver. We investigate whether there is a phase, and whether voltage is applied. If everything is in order with the phase, go to checking the fuses, maybe they melted. If this is the case, then simply replace the fuse. It is important to remember that when making repairs, the installed parts must be of equal value.
After replacement, everything should work, however, it happens that the fuse blows again. This suggests a possible short circuit. Repair needed. Call the scheme. When the defective parts are installed, replace them with new, similar parts.
Compressor failure may be due to a failure in the settings of the pressure control relay. To diagnose this problem, do the following: bleed the air and restart the compressor. If you hear the sound of a running motor, reset the settings, the motor does not function, you need to replace it. Remember that with intensive thermal protection, it is necessary to cool the motor for at least 20 minutes, this will normalize the operation of the compressor.
Special attention should be paid to the situation when, when the device is turned on, both the fuse and the thermal protection fail. If the problem is only that the installed fuse is not designed for the operating power of the unit, then the repair is reduced to a simple replacement of the spare part. But if the relay is out of order, do not try to climb there yourself. To receive you need to qualified repair go to the service.
In a situation where the piston is faulty, you need to disassemble the device. When making a repair, release the air, clean the valve from dirty formations, if the pressure continues to fall - the problem is in the valve, it needs to be replaced.
Where to get spare parts for compressor repair
With such an abundance of car dealerships and places of sale of components, your head can simply go around. Where to buy spare parts for repairs or new attachments. In principle, there is not much difference in the places of sale of spare parts. It's a matter of convenience for everyone. Someone goes to a specialized store, someone goes to the meal, and someone is convenient and profitable to order spare parts via the Internet. The taste and color as they say.
The main thing is not to run into a fake when making a purchase. Original spare parts are a guarantee of their long service. Ask for a certificate or warranty card when purchasing new compressor repair parts from a dealer.
In general, compressor repair is not difficult and can be done without the appropriate experience or qualifications. Although it is better to prevent damage in advance, simply by taking care of the equipment.
Not really
Compressor is complex enough Technical equipment, as it is used, it has the right to wear out and break. In this article, we will consider all the methods of maintenance and operation to maximize its life. Execute DIY compressor repair, if he still broke, perhaps.
The reliability of compressor equipment largely depends on timely and quality maintenance. A large number of piston compressor breakdowns are the result of poor-quality cleaning of the compressed air (abrasive dust, water, and other inclusions). Application and timely replacement and cleaning of filter elements will delay compressor repair by long time.
The main reasons why a reciprocating air compressor fails are:
- Unfavorable operating conditions
- Scheduled maintenance is not performed
- Not competent service personnel
To ensure high-quality maintenance, operation and repair of the compressor with your own hands, it is necessary to solve all the above points.
The main difference between maintenance and compressor repair is that during repairs, certain parts are forcibly replaced, and during maintenance, parts are replaced as needed, depending on their actual condition.
Working principle and components
A compressor is a device for increasing the pressure and moving gas to the required source (, grinders, wrenches, and any other pneumatic equipment). The main equipment in demand in body repair became a piston compressor, oil type. In piston, the volume of the working chambers is changed by means of reciprocating pistons.
Have different amount working cylinders and distinguish them by the following design arrangement:
- Horizontal
- Vertical
- Opposed
- Rectangular
- V and W shaped
- Star-shaped
The main design flaws: incomplete balance of their moving parts, the presence of a large number of friction pairs, etc. All this is the reason for the failure and subsequent repair.
Before doing compressor repairs with your own hands, you need to study its technical structure. The photo below shows a diagram of a single-stage compressor, piston group.
- Crankshaft
- Frame
- Connecting rod
- Piston pin
- Piston
- Cylinder
- Valve
- Cylinder head
- Valve plate
- Flywheel
- Oil seals
- Crankshaft bearings
On the case near the electric motor there is an automation unit called a pressure switch. It can be used to adjust the compressor. It is possible to lower the pumped pressure or increase it.
Reciprocating compressor malfunctions
If any defects are found (the appearance of knocks, jamming of rubbing parts, strong heating, increased consumption of lubricant, etc.), it is necessary to make repairs.
It is important to establish the definition of the type and volume of repairs at the stage of diagnosing the state of the object before repairs. Compressor malfunctions can be divided into two groups: technical malfunctions (working part of the piston group and malfunctions of electrical equipment). Below are the most common breakdowns:
- The electric motor hums and does not rotate
- Compressor not picking up speed
- Knock in the cylinder-piston group
- The cylinder is too hot
- Performance has dropped
- Strong vibration
Compressor (motor) does not start
The compressor will not turn on, the most common problem. The main and trivial thing that can be in this breakdown is that there is no voltage in the network. The first thing to check is the plug and wire for an open circuit supplying the electric motor. Using a special "tester screwdriver", check whether all phases are energized. Check the fuse, if present. Make sure that the starting capacitors are working (for single-phase compressors, the voltage is 220V).
Pay attention to the pressure level in the tank (receiver). Perhaps the pressure is sufficient and the automation does not start the compressor, as soon as the pressure drops to a certain level, the electric motor will start automatically. This is not a breakdown, many people forget about this nuance and worry ahead of time.
The check valve can also become a problem if the compressor does not turn on. Also, a faulty automation unit (pressostat) affects the breakdown (on, off), the button on the unit itself may have become unusable.
If the electric motor does not start, hums, hums does not pick up the required speed, or stops during operation, this does not always mean its breakdown.
The main malfunctions of the electric motor that can interfere with its correct uninterrupted operation:
- Low motor power (insufficient mains voltage)
- Loose connections, poor contact
- Out of order check valve(leaks), thereby creating back pressure
- Incorrect starting of the compressor (see operating instructions)
- Piston group jammed (due to lack of oil level, overload)
If the electric motor of the compressor does not turn on at all and does not make sounds, then this indicates the following:
- Mains supply fuse tripped
- Overload protection tripped
- Bad contact in electrical circuit(wiring problems)
- The worst thing is that the electric motor burned out (there is often a characteristic smell)
Knock and rumble in the cylinder and piston group
One of the reasons for compressor breakdown is a faulty piston group. It is quite easy to recognize a defect in this system. They are usually accompanied by thumping, crashing, grinding and other sounds of a metallic nature. If the compressor knocks, then its discharge part is faulty, where there are many metal parts that interact with each other. Due to their friction and wear, there are extraneous noises and unpleasant sounds.
You should not start with such a breakdown; if possible, it should be eliminated as soon as you heard the first signs of their manifestation. The main faults if the compressor starts to knock and work loudly than before:
- Crashed bearings, connecting rod bushings
- The bearings on the crankshaft are out of order.
- Worn out piston, rings, finger on the piston
- Cylinder worn out
- Loose cylinder and head bolts
- Solid particle hit the cylinder
- The cooling impeller is loose on the pulley
To repair these breakdowns, in simple cases, it is enough to stretch all the bolts and nuts. If the piston, cylinder, crankshaft or connecting rod are worn out, then a comprehensive overhaul is required. When repairing a piston group, it may be necessary to bore the cylinder, if it is badly worn and has external defects, select a repair piston according to new dimensions. Below are the possible defects piston system:
- Changing the diameter of the piston, cylinder
- Distortion of the shape of the cylinder mirror
- Risks, scratches, scuff marks on the cylinder walls
- Cracks in the main working part
- Flange cracks and breakage
With prolonged operation, due to wear, risks appear on the cylinder mirror, inner diameter bushings for eccentric shaft. During repairs, the cylinders are restored by pressing the sleeves into them. Worn bushings for the eccentric shaft are replaced. This repair is quite difficult to do with your own hands without the necessary tool and equipment. Since the most time-consuming and responsible stage is the restoration of the cylinder. Boring is performed on a vertical boring machine using a special device.
As far as the cylinder is concerned, below we will consider the main malfunctions of the compressor crankcase.
- Cracks in the walls of the crankcase cavities
- Deviations in the size and shape of landing sites
- Warping of seats
- Crashed seats for crankshaft bearings
When these units are worn out, they must be replaced with new ones. The hole for the bearings is bored on a horizontal boring machine for a larger bearing diameter or for pressing the bushing, followed by boring the pressed bushing to the required diameter. Repair of a compressor of such complexity should be performed by qualified specialists.
Below, spare parts "repair kit" for the overhaul of the compressor, piston group.
Compressor gets very hot
If the compressor is very hot, then this signals some kind of malfunction. There can be several reasons for overheating. Starting with a simple one, it is blocked the airflow to the cylinder and the crankcase. Check if the impeller is covered by foreign objects.
One of the main causes of a heating compressor is a lack of oil level. Working units work for wear, high friction is created as a result, it gets very hot. With further such work, the equipment will quickly fail. Check the oil level, if it is not enough, it is necessary to top up to the correct level.
Valve failure due to carbonized contamination or loosening. There may also be clogged air passages.
Look at the pressure level, it is possible that the automation has broken down and the compressor is "threshing" to a high pressure, and this causes overheating. The safety valve may need to be repaired or replaced.
Try to locate the compressor in a cool, airy place, especially during hot seasons. Whatever cooling it has, it will heat up much less, which will affect its positive and durable work. "Also, do not forget that the colder the air, the less moisture and oil impurities in it.
Performance has dropped
The drop in performance can be due to several reasons. Clogged, clogged suction air. Remove and clean the filter with compressed air or replace it. Mostly in reciprocating compressors, it is made of regular foam.
It is possible that there is an air leak somewhere. Inspect all incoming and outgoing tubing and hoses. As in the previous case, wear and malfunction of the valves are possible, this greatly affects the performance. With a sufficiently long use, the piston rings wear out, the sealing disappears. In more serious cases, the cylinder and pistons are worn, scratched or have other external defects, which leads to loss of compression and the compressor stops pumping air.
It is worth checking the tension of the belt connecting the electric motor and the crankshaft of the piston system. When loose, slippage is possible and the compressor stops pumping air properly.
Oil gets into the working chamber
If oil gets into the working chamber, there are bad enough signs, of course, this will not lead to complete failure of the compressor, but it will cause harm painting works and the appearance, very much even can. The main reasons for oil getting where it does not need: Filled with low viscosity oil, that is, the oil is too liquid, it seeps through the seals and rings. The oil level is too high. Due to the excess oil, it is squeezed out with force and enters the chamber. Incorrect oil used. Fill with special compressor oil only.
The piston and rings in the cylinder block are worn out. Also, the wear of the cylinder itself affects the ingress of oil into the working chamber. To eliminate the malfunction, it is required to repair the compressor of the piston group, which are described above.
Compressor operation and maintenance
A reciprocating compressor, like any technical equipment, requires certain maintenance. Correct operation will help extend the life of your compressor equipment. Consider the main activities for the maintenance, repair and operation of the compressor.
1. Replacing and cleaning the air filter. The filter element is mainly made of non-woven material, foam rubber or synthonin. If the compressor is located in the same place where the car is painted, then it becomes heavily clogged (sticks) with dust from another paint material... The filter prevents abrasive dust from entering the cylinder, the piston and cylinder wear less. Change and clean the filter as often as possible, as this will significantly increase the resource and will postpone the repair compressor.
2.
Oil change is a very important point. Watch the oil level on a special indicator (window) in the compressor crankcase. Operating at a low level or without oil will result in major overhauls. Top up to the required level if it is not enough. Periodically, it is necessary to completely drain and fill in new. Use only special compressor oil. Oil for piston compressor Mobil, Fubug, Shell VDL 100, КС 19, 46 or any other branded oil.
3. Condensate drain. An important point in compressor maintenance. The air is saturated with moisture, it inevitably enters the receiver with the intake air. Over time, it accumulates in large quantities. With a high content of condensate, it can be thrown into the air hoses, which leads to defects during painting. Also, due to condensation, corrosion begins inside the receiver. Drain off condensation as often as possible, at least once a week, especially during hot and humid seasons.
4. Monitor the general condition, periodically blow out dust and other contaminants. Take away Special attention impeller on the electric motor, cylinder ribs, air radiator, during use, dust and dust from paint adhere to them, which reduces the cooling capacity.
5. Inspect the belt drive for wear and tension. When pressing on the belt at the midpoint, it should not bend by more than 12-15 mm. Broach all nuts and bolts. Periodically check the function of the safety valve, which serves to protect against overpressure due to a breakdown of the pressure switch.
Follow all of the above methods and you will delay the repair of the compressor for a long time.
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Reciprocating compressor operation and repair 55,069 Views
There are situations when air compressor, peacefully rattling the engine in the corner of the garage, begins to malfunction, or even turns off altogether. And at this moment, as luck would have it, there is a need for it. Do not be afraid, after studying theoretical information, repairing a compressor with your own hands will not seem like something unattainable.
Purpose, main elements and principle of operation
The main purpose of air compressor units is to create a continuous, uniform jet of compressed air. The dense gas stream is then driven by various pneumatic tools. These can be airbrushes, tire inflation guns, wrenches, cutting machines, pneumatic chisel, nailer and so on. In the minimum configuration, the compressor unit is equipped with a supercharger (an engine that creates an air flow) and a receiver (a container for storing compressed gas).
Compressors with a piston system electric motor have found the greatest application in car repair shops. In the supercharger crankcase, the transfer rod moves along the axis back and forth, giving the oscillatory moment to the reciprocating movement of the piston with O-rings. The bypass valve system located in the cylinder head works in such a way that when the piston moves downward, air is taken from the inlet pipe, and upward - it is returned to the outlet pipe.
The gas flow is directed to the receiver, where it is compacted. Due to its design, the blower produces an uneven air stream. Which is not applicable to spray gun use. A kind of condenser (receiver) saves the situation, which smooths out the pressure pulsations, giving out a uniform flow at the outlet.
More complex construction the compressor unit implies the hanging of additional equipment designed to ensure automatic operation, dehumidification and humidification. And if in the case of a simple execution it is easy to localize a malfunction, then the complication of the equipment execution complicates the search. The following are the most common faults and remedies for the most common piston-type compressed gas systems.
Compressor installation defects
To make it easier to find the problem, all defects can be classified by the nature of the malfunction:
- Compressor unit blower does not start
- Compressor motor hums but does not pump air or fills air reservoir too slowly
- At start-up, the thermal protection circuit breaker is triggered or the mains fuse is blown out.
- When the blower is turned off, the pressure in the compressed air tank drops
- Thermal protection circuit breaker periodically trips
- The outlet air contains a large number of moisture
- Engine vibrates violently
- Air flow is consumed below normal
Let's consider all the causes of the problems and how to fix them.
System blower does not start
If the engine does not start and does not hum, then the supply voltage is not applied to it. First of all, using an indicator screwdriver, check the presence of "zero" and "phase", as well as the reliability of the plug-to-socket connection. In case of poor contact, measures are taken for a tighter fit. If there is 220 V at the input of the circuit, the fuses of the compressor unit look.
Failed ones are replaced by passive protection devices of the same rating as defective ones. In no case are hot melt inserts intended for larger electricity... If the fuse blows again, you should find out the cause of the failure - probably a short circuit at the input of the circuit.
The second reason why the unit does not start is that the pressure control relay in the receiver is faulty or the level settings are out of order. To check, gas is released from the cylinder and the supercharger is tested. If the engine is running, the relay is reset. Otherwise, the defective part is replaced.
Also, the engine will not start when the thermal overload circuit breaker is triggered. This device turns off the power supply circuit of the winding of the electrical device in case of overheating of the piston system, fraught with seizure of the motor. Let the blower cool down for at least 15 minutes. After this time has elapsed, restart it.
Engine hums but does not run or is running low
With an underestimated mains voltage, the electric motor does not master the scrolling of the axis, while it will hum. With this malfunction, first of all, we check the voltage level in the network using a multimeter (it must be at least 220 V).
If the voltage is normal, then the pressure in the receiver is probably too high, and the piston does not overpower the pushing of air. In this case, manufacturers recommend setting the “AUTO-OFF” automatic switch to the “OFF” position for 15 seconds and then moving it to the “AUTO” position. If this does not help, then the pressure control switch in the receiver is faulty or the bypass (check) valve is clogged.
You can try to eliminate the last drawback by removing the cylinder head and cleaning the channels. Replace the defective relay or send it to a specialized center for repair.
Compressor start-up is accompanied by blown fuse or activation of automatic thermal protection
This malfunction occurs if the installed fuse is below the recommended rated power or the supply network is overloaded. In the first case, we check the compliance of the permissible currents, in the second, we disconnect part of the consumers from the electric main.
A more serious cause of the malfunction is incorrect operation of the voltage relay or breakdown of the bypass valve. We bypass the relay contacts according to the scheme, if the engine is running, then the actuator is faulty. In this case, it is more advisable to contact an official service center for technical support or replace the relay yourself.
When the supply voltage is turned off, the air pressure in the receiver drops
A drop in compressed air pressure indicates that there is a leak somewhere in the system. Risk areas are: airway high pressure, piston head check valve or receiver outlet valve. We check the entire pipeline with a soapy solution for air leaks. We wrap the detected defects with sealing tape.
The drain cock may leak if not properly closed or defective. If it is closed all the way, and soap solution is bubbling on the spout, then we change this detail. When screwing in a new one, do not forget to wind up the fum tape on the thread.
In the case of tightness of the air line and the exhaust valve, we conclude that the compressor control valve is not working correctly. For further work, be sure to bleed all the compressed air from the receiver! Next, we continue to repair the compressor with our own hands, disassembling the cylinder head.
If there is dirt or mechanical damage to the bypass valve, we clean it and try to fix the defects. If the malfunction is not eliminated, then we replace the control valve.
Regular activation of automatic thermal protection
This defect occurs when the power supply voltage is too low, the air flow is poor, or the room temperature is too high. We measure the voltage in the network using a multimeter; it must be at least the lower limit of the range recommended by the manufacturer.
Poor air flow into the discharge system is due to a clogged inlet filter. The filter should be replaced or washed according to the manual. maintenance installation. The piston engine is air-cooled and often overheats when in a poorly ventilated area. The problem is solved by moving the compressor unit to a room with good ventilation.
The outlet gas stream contains a lot of moisture
This situation occurs under the following conditions:
- Large accumulation of moisture in the receiver
- Air intake filter dirty
- The humidity in the room of the compressor unit is increased
Moisture in the output stream of compressed air is fought by the following methods:
- Drain excess fluid from the cylinder regularly
- Clean or replace the filter element
- Move the compressor unit to a room with drier air or install additional filter-moisture separators
In general, piston engines are prone to high vibration. But, if the previously relatively quiet compressor unit begins to rumble, there is a high probability that the engine mounting screws are loosened or the material of the vibration cushions is worn out. This malfunction is eliminated by pulling all fasteners in a circle and replacing the polymer vibration isolators.
Compressor runs intermittently
Interruptions in the operation of the engine can be caused by incorrect operation of the pressure control switch or too intensive extraction of compressed air.
Excessive gas consumption occurs due to a discrepancy between the compressor capacity and the power consumption. Therefore, before buying a new pneumatic tool, carefully study its characteristics and air consumption per unit of time.
Consumers should not take more than 70% of the compressor capacity. If the power of the blower with a margin overlaps the requests of the pneumatic tools, then the pressure switch is faulty. We either repair it or replace it with a new one.
Air flow rate is abnormal
This malfunction occurs as a result of a gas leak in the high pressure system or a clogged air intake filter. Air leakage can be minimized by pulling all butt joints and wrapping them with sealing tape.
Sometimes it happens that when draining condensate from the receiver, they forget to completely close the drain valve, which also leads to a gas leak. This problem is easy to solve - by tightly closing the valve. If the dust filter is clogged, clean it or, even better, replace it with a new one.
Most The above malfunctions can be avoided by correctly carrying out the first start-up and running-in of the mechanisms, as well as performing regular routine maintenance.
Timely maintenance guarantees the unit's operability
In order for the device to function properly for a long time, the recommended service should be started at initial stages exploitation. Experts recommend the following actions from the date of purchase:
- When opening the transport packaging, the presence of a passport for the installation, technical documentation and compliance with the factory inventory of component parts is checked.
- Before the first start of the engine, the oil level is checked on the dipstick and, if necessary, topped up to the recommended mark. The oil should be filled with the one recommended by the manufacturer and specified in the technical documentation. For better spreading of the lubricant and check the correct operation, let the compressor idle for 10 minutes.
- If there are no comments, the pneumatic tool is connected to the compressor installation and work begins. Note: it is undesirable to supply power to the blower when there is overpressure in the receiver.
- Try to keep a record of the compressor operating time and change the oil to a new one after 500 hours of operation. For this, the flange cover of the crankcase is removed, the working off is drained and the accumulated dirt is cleaned. Only then is fresh grease poured in.
- Clean the air inlet filter weekly.
- After 16 hours of operation, moisture is drained from the receiver using the drain cock. Manufacturers also recommend that the inner surface of the cylinder be cleaned with special tools every six months.
- At the end of the work, the compressor unit is disconnected from the supply network, and air is vented from the high-pressure system.
- If the blower has not been used for a long time, the contact pads of the air valve must be cleaned and lubricated before starting.
- Non-conductive metal parts must be grounded. As a rule, manufacturers lead the grounding conductor into a Euro plug. And you only need to ground the corresponding contact in the socket into which the compressor unit is connected.
Timely observance of these simple requirements will keep the mechanism in good condition. Such a time-consuming procedure as repairing a compressor with your own hands will be required extremely rarely. Proper grounding will avoid problems with the electrical part of the device. Regular replacement of oil and cleaning filters will prevent premature wear of rubbing parts.
Good afternoon. A big request for help, those who faced a similar problem. Our company has been repairing tools for 5 years already, and we have not encountered such a problem before, and now there are 2 compressors with the same problem. The electric motor is serviceable, the capacitor is also serviceable, for testing there are all devices that are able to determine the capacitance of the capacitor, and the exact resistance of the windings. The point is in the mechanical part, the compressor pumps up to 4 atmospheres, and the flywheel jams, as if the bypass valve does not work. That is, the pressure from the receiver presses back, and the engine cannot turn the flywheel with such an effort, turn off the compressor, turn the flywheel with great effort, start the engine, it makes one revolution, with the previously inflated pressure, and stops again, that is, the mechanics jam. The bypass valve is new, we tried to change the piston rings, the same situation, we are at a loss. If someone has encountered a similar problem, please help with information.
Auntie brought such a compressor, she says the ball is pumping up, but the car's wheel is not. The pressure gauge on the compressor does not work, I connected my own, for sure, it gives out 0.2 atm. And that's it. As usual, the hose is intact, so we check the valves. Intake, located in the bottom of the piston, in order, but the exhaust, located in the cylinder head, very surprised. In both cylinders, rubber rings were slipped under the valves, of course, the valves are constantly open and the compressor I just pumped air inside myself without creating pressure. I removed the rings, collected everything, turned it on, 2 minutes and on the pressure gauge 3.5 atm. Can anyone explain how these rings could get under the valves? through thoughtlessness.
ELITECH TP30G, 30 kW. The heat gun stalls after 15-30 minutes of operation and does not start, or rather, if you hold the feed with your hand, it works, you release it stalls until you rest for 5-10 minutes, I suspect that the temperature sensor is triggered, although the gun works at an average power, I suspect that the air intake may be poorly adjusted, because the smell appears very quickly carbon monoxide, when I disassembled the gun I saw only one adjusting bolt for a hexagon but did not touch it yet, I am waiting for your advice, thanks for earlier
Possible reasons for the insufficient performance of the screw compressor.
Why is the screw compressor not pumping?
When screw compressor ceases to give out the nominal performance, one often hears phrases from the client: "Maybe the screw block is already old, worn out?"
Many people look at this problem by analogy with a piston compressor, where a drop in performance is often associated with increased wear of the piston rings and cylinder bore. Meanwhile, mechanical wear of the surfaces of the helical stage rotors is very rarely the reason for a decrease in the performance of even a fairly old compressor. The fact is that when working screw block, unlike a piston compressor, there is practically no mechanical friction between the surfaces of the rotors due to the formation of an oil wedge. In this mode, the screws can work for decades, and only the moment the screw compressor starts up is dangerous from the point of view of wear, when the pressure in the system necessary for the operation of the lubrication system has not yet been reached. Only the bearings wear out in the screw block, and they change when overhaul and this wear is not reflected in productivity. Working out on screws is a sign that it is time to throw out the screw block; as a rule, very little time passes from the appearance of such a development to the block getting jammed. The reasons for a decrease in the performance of a screw compressor are usually quite different. First of all, you need to check the suction valve - it may not open or does not open completely for some reason. Contaminated air filter can also be the cause of this malfunction - it creates a vacuum at the inlet, does not let in a sufficient amount of air. The third option is air leakage through the bypass line, through which air must be supplied from the separator tank to the suction of the compressor during idle and shutdown of the compressor. If this line is not closed during the working stroke, part of the air will run in a circle. Insufficient performance can also be caused by air leakage through any leaks inside the compressor. We do not consider the options for critical contamination of the compressor compressed air lines or insufficient oil, since these factors are manifested primarily by other symptoms, and there is no need for a lack of performance.
But, to be honest, from practice the most common reason for a drop in performance is ... the absence of such a drop. The reason is not inside compressor, and outside - an increase in the consumption of compressed air in the line. This can happen due to the connection of additional consumers, leaks of compressed air through leaks or fistulas that appear as a result of corrosion on the pipelines, and simply because someone somewhere forgot to close the tap (this has happened, it is especially interesting when this crane is located in a remote, isolated and long-closed room, where the compressed air lines, it would seem, should not pass according to the project).
Therefore, when you suspect a drop in performance, it is worth checking the trunk first. If this is difficult, you can empirically measure the performance compressor, and then it will already become clear whether it is necessary to call the service for compressor repair, or it is serviceable and the reason should be looked for elsewhere.