Elimination of resonance on a Vran 9 type fan
The fight against the vibration of the fans. A special niche in the practice of the vibrationagnost. At many enterprises, fans close their eyes. Like cheap, low.responed, etc.P. But in my opinion fans. The main source of the experience of a novice vibrationagnost/vibrationword. Fans, as a rule, are mounted/operated with violation of the requirements, have small rigidity, and accordingly there is a huge mass of defects on them. In this article, we consider the impact of improper installation on the vibration of the unit, localize the defect and eliminate it.
Another call for diagnostics. Cause. High vibration leading to the loss of rivets from the fan snail (n = 15 kW, n = 750 rpm).
Vibration measurement points Distribution of VIBROKOSKIT measurement in the range of 10-1000 Hz:
Vibration of 4.5 mm/s vibration. From the table we see a large difference between vertical and horizontal components, therefore, with a high degree of probability, we can assume the presence of resonance in a horizontal direction.
The spectrum of vibration.resistance in the horizontal direction:
As you can see, vibration is focused on the reverse frequency. Stop the unit and defeat our own frequencies:
The reverse frequency of 12.5 Hz is located in the field of own frequencies. The resonance is confirmed. Now the main question. how to get rid of it? From the theory, we know that our own frequencies can be taken by changing the mass or rigidity. Of course, we will not mount a box with a fraction, the option with a change in mass disappears. Only stiffness remains.
When eliminating resonances, I have a fundamental approach. First, it is necessary to inspect the quality of the installation of the equipment (tights of the fasteners, the complete fit of the fitting parts, the absence of a weakening of anchors, etc.P.). Then experimentally determine the place in which the change in the rigid characteristics most effectively reduces the effect of resonance on vibration. For this, improvised materials are used. scrap, pipe, jack, etc.P. And only then, when the place is determined, can you make changes in the design. Add fasteners, cook stiffeners, peel the fit with laying plates, etc.P. I have already seen enough of my experience, as the ribs of stiffness are thoughtlessly welded thoughtlessly. In addition, this not only does not improve vibration, but on the contrary, it worsens it, leads to curvature of the frames, spoils the aesthetic type of unit structure.
The inspection of the unit showed the lack of an adjustment of the unit frame to the helmet of the base directly under the resistant cabinet of the electric motor from the bearing side is easily determined. We press the finger to the junction of two surfaces. For some reason, the fasteners are provided only at the four corners of the aggregate frame. Judging by the spectra, its own frequency must be diverted from the back towards its increase, that is, to strengthen the rigidity. And here it is precisely its strengthening. Now we check this assumption by installing and adjusting the jack under this counter, looking at the testimony of the device in the mode without offering (the sensor is installed at point 2P):
We measure the VIBROSKIT SKZ at all points after installing the jack:
Then a protocol was drawn up indicating the cause of increased vibration and recommendations for rebuilding from resonance. As a result, the owner of the equipment gives good to eliminate vibration. Two options for solving the problem beg. drill a frame and a channel with the subsequent installation of fasteners, or provide fit by installing the plates in the gap between the frame and the channel. I chose the second option, as the easiest. In the indicated gap, he scored a plate 2 mm thick under the control of vibration on a working unit. Visually, she is not visible that everyone is more than suits. And the final measurement of the VIBROSKOSKI SKZ after such a vibration board:
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The unit does not turn on
In this situation, there may be 2 options: a light bulb that means the readiness of the unit to work, can be caught or not. Depending on this, the algorithm for diagnosis of the breakdown will differ.
The bulb does not burn
If, after the device is turned on, the bulb located on its case does not light up in the outlet, and it does not start, then, first of all, it is necessary to check if there is a voltage in the outlet. It is done simply: take any electrical appliance and include in this outlet. If the device has earned, then you need to look for a malfunction in an electric fork and cord.
To check the fork, spin it and check the reliability of the connection of the wires to the terminals. To check the cable, it is necessary to disconnect it from the contact pad of the device and “call” the tester. If a cliff is detected in the cable veins, it should be replaced.
The bulb is on fire
The reason for this behavior of the unit, when the indicator bulb burns, but the fan does not work and no sounds can be heard, it can be caused by the blocking of the block with the buttons. To check the buttons, you need to disassemble the button unit located on the floor fan stance or stand near the desktop. But, before disassemble the device, make sure that it is turned off out of the outlet.
The work of buttons is very simple: there is a “vkl” and “off” position. Using the tester, check the “output” and “input” on each key.
If a faulty button is detected, it will not work to repair it. Therefore, the switch should be replaced or the connection is directly. This approach to solving the problem will help start the unit into work if you are far from the store, for example, in the country.
Faulty speed switches can also cause why the fan does not turn on. To check the regulator, you will need to put it in the maximum position and check the “entrance” and “output” using the same tester.
The electrical circuit of the fan
The electrical circuit of the fan consists of two parts. an electric motor with a starting condenser and a block of turning and adjusting the speed of rotation of the blades.
The electric motor is a metal case (stator) in which are fixed and connected according to the given scheme of the winding from the copper wire. The rotor is also fixed in the case in the sliding bearings, which reacting to the appearance of an electromagnetic field during the windings of the stator, rotates.
Giving with the help of interconnected switches S1, S2 and S3 the supply voltage to the windings L1, L2 or L3 can adjust the speed of the air flow. The winding of the electric motor L4 and the capacitor mounted on the engine housing, C1 are used to start the engine.
If the L4 winding or capacitor C1 is in the cliff, then the engine does not start when switching on in automatic mode. But if you turn the impeller with your hand by the clock, then the blades will begin to rotate. In this way, you can determine the malfunction of this chain.
In some models of fans, the heat.guide is installed to protect the windings from overheating if the circuit is indicated by ST °) on the response temperature of about 125 ° C.
The heat.subject, when heated above the calculated temperature, breaks the circuit and the supply voltage does not enter the engine windings. This prevents their burning in the case of jet jamming when developing lubrication. The heat.subject is usually installed on the end of the stator windings.
Thermal subjects are two types. disposable and self.healing. The latter, when heated above the temperature indicated on their body, break the circuit, and when cooled, they are closed again. This avoids the need to replace them in case of jet jamming.
DIY fan repair
You can see the repair of a floor or desktop fan clearly
Sean Paul. Dynamite ft. Sia
Pay attention to the following useful tips:
- Do not let the fans work for too long (continuously);
- Do not use fan equipment for open rotating elements, that is, in the absence of a protective grate;
- Do not allow direct sunlight on plastic elements (they are deformed);
- Do not forget about lubrication;
- Do not install the device near heating devices (gas or electric stoves);
- If you doubt that remember the exact location of all parts, it is better to take appropriate photos during the disassembly of the fan;
- Do not turn on the device after your own repair directly in the mains. use RCD blockers (if they work, take the fan to the workshop or double.check the wire connection).
If you started repairing a floor or desktop fan with your own hands, be sure to study all the information, and if necessary, consult with specialists. Even if you do not have sufficient experience, still try and believe in your strength.
How to reduce the noise PC caused by vibration of the case
How to reduce the noise of PC, caused by the vibration of the case with a noise source published by PC, are:. fan noise (treated with a decrease in revolutions and replacement with large in size);. Winchester noise;. Vibration of the case caused by fans and the engine of the hard drive. Until recently, I did not suspect that the vibration of the case could irritate so much. However, after I replaced the TA-661 BP with FSP 12 cm in my case and turned on this valve through the resistor, and the remaining 12 cm valves on the bucket, blowing and connected to the CPU to the finalized Zalman Fan Mate 2 (thoroughly soldered to the other side The LM 7805 linear regulator to the radiator, so as not to bite, and the pen of the alternating resistor puts on the front panel 5.25 “) and set the velocity of the valves in.
How to reduce the noise PC caused by vibration of the case
Until recently, I did not suspect that the vibration of the case could irritate so much. However, after I replaced the TA-661 BP with FSP 12 cm in my case and turned on this valve through the resistor, and the remaining 12 cm valves on the bucket, blowing and connected to the CPU to the finalized Zalman Fan Mate 2 (thoroughly soldered to the other side The LM 7805 linear regulator to the radiator, so as not to bite, and the pen of a variable resistor puts on the front panel 5.25 “) and set the velocity of the valves in the region of 650 rpm, I heard the irritating rumble of the case.
Experimentally established that the left removable cover of the case vibrates. over, if you press it with a hand in the area of the window opposite the CPU or in the center, the hum is significantly reduced. The following helped: along the entire perimeter of the lid, I pasted the isolet, including the bent side for the screws. The island width is about 1 cm, it is a outline of 1 cm wide, or a little larger, and the lid with the body is in contact. Then, with some effort, he pushed the lid to the case and screwed 2 screws. Voila, the cover almost stopped publishing a rumble.
You can also stick a thick fragmented foam rubber on the legs of the case (like the one that is in boxes with UPS).
So those who have the left cover of the case are buzzing, the isolet can help.
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How to disassemble the device? Step-by-step instruction
Before proceeding with the performance of the detection of breakdown and its elimination, it is necessary to disassemble the household device. Take this stage very seriously. The fact is that an incorrect independent approach can aggravate the situation and then the device will be completely faulty.
In order to prevent such a development of events, we strongly recommend that you follow the above plan, and then the procedure will become easy and understandable.
- First, prepare the necessary tools. These are pliers, screwdrivers of different sizes, unnecessary dense fabric. You will need a container with water. But place the fan itself directly next to you.
- Now, using force, try to remove the protective net. If necessary, use additional tools. Set aside the grid. In front of you you will see three holes of a small diameter. These are latches.
- Pay your attention to the plastic nut that is available in front of you. You need to unscrew it with a screwdriver. At the same time, you must be counterclockwise movements.
- Unscrewing the nut, do not use strength, because a fragile plastic may simply not withstand.
- Look at the engine axis. Be sure to remove the blades from her.
- Disconnect the grate from the body.
- Now unscrew absolutely all the screws that you see in front of you.
- Remove the casing that was attached to the screws.
- After removing the casing on the fan, only the gearbox and the engine itself remains.
Now that all the necessary phased actions are completed, you can congratulate you, and also, we suggest you go to the next important point.
Search and elimination of malfunctions during the repair of a household fan
Before proceeding with your own hands, it is necessary to study the scheme of the device. As a rule, an asynchronous electric motor is placed in the floor fan, consisting of eight windings (working and starting). For a successful launch, a phase shift is required by 90 degrees. For these purposes, the capacitor is installed. The device begins to work after pressing the turning button, after which the indication light lights up and the engine starts, the rotation speed depends on the switch of the windings, for which the switch 3 of the speeds with mechanical locking of the simultaneous turning on several buttons, in which short circuits may occur, is possible.
Before proceeding to check the electric motor:
- Immediately you need to check the serviceability of the connection cord to the electrical outlet. To do this, you must first disassemble the switch block, and then, in compliance with electrical safety measures, check the presence of 220 volts on the contacts of the light bulb with a multimeter.
- Check the serviceability of the capacitor according to this instruction.
- Call integrity and check the reliability of all contacts of wires and connections in the circuit. Barling instructions.
- If a rumble or noise is heard during the fan, then lubricate the plastic parts inside the gearbox with a lithol or solidol through the holes, which are specifically provided for in it.
- Check the presence of 220 volts at the output from the switch button on.
Typical floor fan device
On the agenda, the repair of the floor fan with your own hands! You should start small: the simplest fans do not have a ground terminal. The device does not have the degree of electrical safety. The device of the floor fan includes a housing made of plastic. Water will get inside. expect a good shake. The floor fan of the specified variety cannot be used near the water. Starting with an aquarium with fish, ending with a flower vase. Particularly dangerous where young children live. The contraption will fall, the child will guess to pour into the milk Draw the conclusions yourself:
When the floor fan falls with a high degree of probability, nothing will happen. We plunge into the design. So far, we will leave the features of the control of the engine speed and button to the side. Let’s talk about the gearbox. Krasnodar floor fan carries one asynchronous condenser engine. The front side of the shaft through the pin, the nut with the left thread is connected to the blades, the back goes to the gearbox formed by two gears, one double.
Pedestal fan repairing tutorial complete guide in urdu hindi
The shaft is equipped with a thread, clinging, rotating, large wheel teeth. The moment is transmitted to the small wheel that drives the flywheel. The gear of a crooked-shaped mechanism with a diameter in the hand, so rotation is inferior to the speed of the initial shaft of an asynchronous engine.
Through the cardan gear, the crank is hooked by the leg, the engine housing is planted on the axis. When the shaft of the asynchronous engine rotates, the blades move smoothly in one or two. However, you can stop the process. In the double gear, the rolls are attached to the larger gear with two balls with a spring inserted into a through hole. If you pull the regulator handle directly connected to the axis, the latch slides up. The connection between the gear, the shaft, the rotation is stopped. The mechanism implements protection against the fall: six grooves are cut along the internal landing hole of the drive gear. Balls fit. The provisions are six, the mutual transition is accompanied by a click, the axis is turning relative to the gear, the balls beat along the walls, slipping into the grooves.
Clicks are heard, there is a high probability. the floor fan has fallen. The drive jammed, working, clicking, protective mechanism, protecting the motor from combustion.
We believe that the regime is unprofitable to the floor fan, not to turn off the device, the engineer.guard of the motor will certainly break. The gearbox is attached with three bolts to the engine, cut through a pair of lubricants through which you can flavor plastic gears. Concerns the drive, rotating with the speed of the asynchronous engine.
Headache, how to fix the floor fan and collect. We see the alignment: the mutual position of the gearbox, the legs through the transmission, the head of the floor fan will move incorrectly relative to the frontal plane. It can be annoyed. Connection the gearbox, check the product by connecting power. Caution, so as not to hit the current, try to visually determine the correctness of the assembly.
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