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Tianjin Jet Fan -Jin Blower Co., Ltd.Tianjin fan , Tianjin blower , Tianjin fan
Preparation of tunnel jet fan before startup
① If the tunnel jet fan is operating with abnormal sound, it should be stopped immediately to check whether there are any hard debris in the trajectory hitting the tunnel jet fan impeller, or the trajectory has not been blocked, or the ballistic nut is loose.
② The tunnel jet fan should be running in the regular working area. Deviation from the operating zone will increase the DC power consumption and even extend the service life of the tunnel jet fan.
③ The tunnel jet fan promises full-voltage starting or starting, but it should be noted that the direct-current power at full-voltage starting is 5 to 7 times the extra direct-current power. The starting torque is inversely proportional to the square of the voltage. When the grid has more than a certain amount of power, starting should be adopted.
④What should the tunnel jet fan be prepared before starting? When trial operation of the dual-speed tunnel jet fan, the low speed should be started first, and the winding position should be checked for accuracy. When starting the high speed, the tunnel jet fan must be moved before starting to prevent high-speed reverse winding. , Causing tripping of the electric door and damage to the generator. There are not less than two people in the trial production today. One person has the power supply and the other person inspects the operation status of the tunnel jet fan and finds that the abnormal scene is immediately shut down for review. It is checked whether the winding position is accurate. During the process of the tunnel jet fan, the DC power of each phase should be checked. Whether the misalignment and direct current can exceed the extra direct current; if there is no abnormal situation, the review should be suspended.
⑤ Before starting the tunnel jet fan, it should be checked whether the radial clearance of the impeller is uniform, whether the blade device positions are different, and to ensure that there are no foreign objects near and near the tunnel jet fan. The tunnel jet fan is provided with a protective cover. Before the tunnel jet fan is closed, the protective cover must be installed, and whether the running position of the impeller and the mark on the shell can be different.
⑥ If the operation of DC power exceeds its additional DC power, it should be checked whether the voltage supplied to the tunnel jet fan is deformed. When the tunnel jet fan reaches an abnormal rotational speed, it should be checked whether the output DC power of each phase of the tunnel jet fan is deformed. The DC power of the tunnel jet fan cannot exceed its extra direct current.
First, the purpose and working principle of the fan:
SDS series jet fans are widely used in road and railway tunnel operation ventilation systems. Jet fan manufacturers generally suspend several fans at the top or both sides of the tunnel at regular intervals in the tunnel. Part of the total air flow is sucked in by the fan, and after the impeller performs work to generate a high thrust, it is ejected at a high speed from the fan outlet. Such high-speed airflow will transfer energy to the air in the tunnel to push the air in the tunnel to flow forward together. When the distance and wind speed drop to a certain value, the next group of fans continue to work, so that the ventilation purpose of sucking fresh air from the tunnel inlet and exhausting polluted air from the outlet is achieved.
Installation, operation and maintenance of jet fan:
For the installation of the SDS jet fan, two steel plates with a thickness of 20 mm, a width of 200 mm, and a length of a (see table) are buried in the concrete lining during the early construction of the tunnel. The center line distance is "A". Responsible for the completion as shown in the figure. Can also be designed according to user requirements. When installing the jet fan, do not bump or damage the fan, and do not weld the fan. In addition to installing the fan, the axis of the fan should be parallel to the centerline of the tunnel in addition to meeting the requirements of the tunnel boundary, otherwise the wind speed loss will be increased.
The operation control of the jet fan is generally based on the CO concentration to decide whether to open one or a group, and select the high speed or low speed.
When the jet fan is started, in order to reduce the impact on the power grid, it should be started one by one, that is, after the previous fan reaches the rated speed, then the power of the next fan is turned on. The Tianjin jet fan is generally started at an interval of 120 seconds.
The jet fan is switched in the forward and reverse directions, and the power should be turned on after the impeller is completely stopped.
Jet fans do not require special maintenance work. In order to keep the fan clean, periodically wipe the outer surface of the fan according to the pollution.
How to solve the noise generated by the jet fan?
Jet fans and centrifugal fans are more common in operation, and there are some problems in operation. Just like a jet fan, noise will occur during operation. What should I do in this case?
Dealing with the noise of fans is not only the needs of the environment, but also the needs of users to ensure people's healthy life in life. Therefore, the problem of dealing with the noise of fans is imminent. The noise problem of jet fans has always been a typical one of the problems. Jet fans For suppliers, to deal with this problem, tunnel jet fans, we must first find the cause of the problem.
Because the rotation of the impeller is affected by the resistance of the air, it is also normal for noise to occur. This kind of noise is generally referred to as discrete noise. Discrete noise is due to the uneven flow field formed by the structure around the blade and the rotation of the blade mouth design experiment. The noise caused by the action is the air intake and noise caused by the existence of the leading vane or the metal mesh cover before the air inlet. Rotational frequency noise of blades in matte or asymmetric casings. Once such a problem arises, we must improve the impeller.
There are many ways to modify the blades. The common one is the blade perforation method. This method can reduce the vortex noise and allow the air resistance to pass through. Generally, a work wheel blade perforation method is used. Because the turbulence of the blades of the blades often shows vortex separation, the perforation method can be used to allow part of the airflow to flow through the high-pressure surface of the blade to the low-pressure surface of the blade. It is also quite obvious.
In addition to the air resistance, because the bearing's running life will cause certain friction, the possibility of noise is relatively large. Therefore, in the protection and maintenance of the bearing, it must be investigated in time to see if the lubrication system can be used normally. Being used in a good environment can also control the noise level to a certain extent.
Jet fan manufacturer-Tianjin Jet Fan-Jin Blower Co., Ltd. is provided by Jin Blower Group Co., Ltd. "Fan blower ventilator centrifugal fan" was selected by Tianjin Blower Group Co., Ltd. (fuzzlinks.com). The company is located at No. 9 Xishui West Road, Beichen District, Tianjin. For many years, Jin Blower has been adhering to provide customers with good Service, Contact: Mr. Mao. Welcome new and old customers to call us, email us, visit us and negotiate business. Jin Blower looks forward to becoming your long-term partner!
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