Changsha Roots fan labyrinth seal relies on the slot gap is gas throttling, thereby reducing leakage, to achieve the purpose of sealing. Because there is no solid-phase friction, so there is no need for lubrication, and less power consumption, simple maintenance, long service life. Commonly used labyrinth seal structure, there are shallow teeth labyrinth and comb labyrinth two forms. Due to non-contact sealing, even if you increase the number of labyrinth teeth, to take the means of pumping or inflatable, it is difficult to achieve non-leakage. 1. Shallow tooth labyrinth. Bushings and sealing the labyrinth constituted by the inner hole of the seat, the gas sealing effect. Labyrinth bushings are generally made of metal materials, in order to prevent friction of metal parts, the top of the labyrinth usually usually leave a large gap. In order to improve the sealing...

Roots fan has a variety of models, in the use of very much, when the need for Roots fan when we change how to select it, in some models, the parameters are very close. So the selection of Roots fan has the following points: List the conditions and requirements Use: the position and role of the blower in the process, distinguishing between blower use and vacuum use. Gas properties: name. Molecular weight, toxicity, corrosiveness and explosiveness, composition ratio of gas mixture, dust content, etc. Working condition parameters: inlet temperature, inlet pressure, boost (exhaust pressure or vacuum), flow rate, and permissible limits for exhaust temperature and noise, etc. Environmental conditions: installation place (...).

In Roots fan, sealing means is an indispensable. In a sense, a Roots fan seal is good or bad, determines the quality of this Roots fan good and fast. And how is the seal of the Roots fan. Roots fan is divided into many kinds of sealing types, now mainly say mechanical seal. Mechanical seals are similar to ordinary seals in the form of sealing, sealing device is also based on the different parts of the use of different sealing means. In the Roots fan, the main mechanical seal is divided into three kinds: closed wall plate - single mechanical seal, closed wall plate - four mechanical seals in the open wall plate - four mechanical seals. Closed wall plate - single mechanical seal sealing device is mainly for: shaft end...

Shaft sealing includes sealing of three parts, namely, shaft extension, bearing seat end and shaft end, the combination of which is related to the structural type of wall plate. Among them, the role of the shaft end seal is mainly to prevent gas leakage, the other two parts in addition to preventing oil leakage, and sometimes there is a requirement to seal the gas. Usually, the device that seals the gas (or seals the gas as the main working purpose) is called a gas sealing device, and the one that simply has its oil sealing role is called an oil sealing device. Among the common sealing types of Roots fans, they are divided into open wall plate - common sealing and closed wall plate - common sealing. The sealing device of the open wall plate-ordinary seal is mainly the use of skeleton oil seals in the shaft extension part, and the use of the rear part of the bearing seat back...

1. Check the two halves of the coupling, if cracks, or pin holes due to wear and tear, obviously out of round, it should be replaced. Check the keyway, if the deformation is not too large available file to correct it; deformation is relatively large, can be used in machining methods, the keyway widening (but shall not exceed the original size of 10%), and then re-match the construction, if the keyway damage is serious, difficult to repair, and there is no spare parts available for replacement, can be re-processing the keyway on the opposite side of the old keyway. 2. Check the coupling bolts, if there are bald, bent and cracked phenomena, it should be replaced. 3. Check the rubber ring, if it is badly worn, it should be replaced. And all the rubber rings on the coupling should be ...

Most of the impellers, gears, couplings or pulleys of Roots fans are fitted with flat keys where they fit the shaft. Generally, the key and the keyway for the transition fit or clearance fit. As long as the key is put in the right place, with a copper rod can be installed in the keyway by tapping it. If you do not put the right to knock in, it is easy to make the flat key damaged, or the keyway hair. When assembling, first install the flat key on the shaft to make contact with the bottom of the keyway, then align the keyway of another part (e.g., impeller) with the orientation of the flat key and install it on the shaft. If the fit is too tight, the key side prongs can be chamfered slightly larger. However, the width of the flat key should not be narrowed to make it easier to fit. This is especially true for flat keys that transmit torque...

The use of pin positioning of the two parts, if disassembled to be reset, in the original pin hole on the good positioning pin can be. For example, the use of horizontal center part of the structure of the blower, its housing and wall panels are divided into upper and lower two parts, to be disassembled during the inspection, assembly and reset. Reset, first in the upper and lower combined surface between the insertion of positioning pins, and then in screwing the coupling bolt. However, if the relative position of the two parts is changed during assembly, the positioning pin needs to be reassembled. For example, after adjusting the clearance between the two impellers, the relative position of the gear hub of the driven gear ring may change, at which time holes should be re-drilled, reamed and fitted with locating pins between the ring and the gear hub. Reaming the alignment...

Gears, bearings and contact type shaft seals need to be slipped when the Roots Blower is in operation. There are two main types of lubricants, one is lubricant and the other is grease. Usually according to the requirements of the gear selection of lubricants, according to the requirements of the bearing selection of grease. The selection of lubricants and the use of lubricants, the general requirements for lubricants are: Have the right viscosity. Viscosity is too low, can not form a thick enough oil film, will cause abnormal wear, and even the phenomenon of burning sticky. Viscosity is too high, viscous resistance, and will make the oil internal friction increased and produce high heat. Good oxygen resistance and stability. Because the temperature at the gear meshing is very high, if the antioxidant stability of the oil is not good, subject to...

Basic requirements for piping installation Piping should start at the blower inlet and exhaust port flanges to avoid abnormal loading. When installing the backstop valve, the fixing bracket should be removed from the factory, so that the rotating pivot of the valve piece is in the horizontal direction, and pay special attention to the flow direction of the medium. The corrugated expansion joint also has the direction requirement due to the construction reason, and shall not be installed in the opposite direction. After installation, the lever should be removed. When installing the gate valve on the horizontal pipeline, the lever should be vertically upward (or upward slanting at a certain angle). If the installation position is too high, a chain rotation handwheel can be installed for remote operation. When installing a lever-type safety valve, the centerline of the valve disc should be made perpendicular to the horizontal plane. ...

During the operation of the Roots blower, due to improper operation or other reasons, there are often incidents in which the motor burns out or the blower is destroyed. In order to ensure operational safety and prevent accidents, the system should have the necessary safety protection devices. Application of overcurrent relays With its simple structure, easy installation and reliable use, the overcurrent relay is a commonly used motor overload protection device. Before use, the current of the overcurrent relay can be set according to the size of the motor's rated current, as well as the time required to stop the motor after motor current overload. If the blower operates under overpressure, or the rotor rubs against the housing (wall plate), etc., it will make the motor...

  List of conditions and requirements Uses: location and role of the blower in the process, distinguishing blower uses from vacuum uses. Gas properties: name. Molecular weight, toxicity, corrosiveness and explosiveness, composition ratio of gas mixture, dust content, etc. Working condition parameters: inlet temperature, inlet pressure, boost (exhaust pressure or vacuum), flow rate, and permissible limits for exhaust temperature and noise, etc. Environmental conditions: installation place (outdoor or indoor, on the ground or on the floor), local atmospheric pressure, temperature and humidity, etc. Utility conditions: water supply, power supply (including supply voltage), etc. Others: 1) Variable operating conditions: pressure or flow rate adjustment...

The main reasons are divided into the following five points: Too much or too little oil in the oil ring bearing box, or the oil ring manufacturing quality is too poor, so that the oil ring can not rotate or with oil is too small. At this time, the oil volume should be adjusted, repair or replace the oil ring. The oil level in the tank drops below the minimum oil level. At this time, should be immediately refueled to raise the oil level. Hydraulic pump or oil pipe in the lubricating oil frozen in the parking process. In this case, the frozen lubricant should be replaced and cleaned. Bearing installation will be installed in the bush oil inlet direction of the reverse or for the right, bearing lubricant inlet at the throttle ring aperture is too small or blocked. At this time, the bushings should be re-anchored, the appropriate increase in the throttle ring aperture, remove the dirt. Gear hydraulic pump, oil cooler...

The speed reducer used in Roots fan is generally composed of a pair of cylindrical spur or helical gears with different diameters. Reducer in operation, such as the production of a lot of noise or a sudden increase in the sound, sometimes irregular banging sound, gear box body vibration, bearing temperature increases, premature wear of gears and other phenomena, there may be the following reasons. The center of the gear shaft is installed incorrectly, the reducer large gear shaft and blower shaft, reducer pinion and motor shaft is not concentric, or the two gears are installed not parallel, will cause the reducer vibration. If the deviation of the different centers is large, it will make the gear operation unstable and produce violent vibration, and, it will make the tooth surface...

Roots fan in operation, resulting in impeller damage or deformation of two kinds of cases, one is the fan running time is long, more than the normal wear and tear of its service life; a kind of not reached the design service life of the sudden damage. The reasons for the latter situation are: Corrosion or wear on the blade surface or rivet heads; Loosening of rivets and blades; 3 The impeller produces imbalance, and the vibration value exceeds the specified standard, so that the impeller is distorted and then skewed too much. Solution: 1. Individual blades or rivets are damaged, the damaged blades or rivets can be replaced; most of the blades or rivets are damaged, then the impeller should be replaced with a new one. 2. Individual blades or rivets loose, available small punch tightened, if ineffective, it should be replaced...

The rotor of the fan has been corrected for static and dynamic balancing at the manufacturing plant, and should not be unbalanced under normal circumstances. However, one of the following factors can cause rotor imbalance: Due to the manufacture of balance process omission, correction is not accurate, balance in the de-weighting (or aggravation) part is not appropriate, the permissible value of dynamic imbalance exceeds the prescribed value, the counterweight fast loosening and so on. At this time, should check the balance block position or recalibration. Rotor surface adheres to the spoils more (such as dust, grease, rust, etc.), destroying the balance of the rotor quality. At this time, the rotor surface should be cleaned up the spoils. Due to improper manufacturing, transportation and storage, caused by loose parts on the shaft, loose rivets on the impeller...