Material of vacuum pumping system _

1. Vacuum send overview

vacuum pump or fan used as a source of power, vacuum inside the system, the material in the pipeline to state of suspension movement, working gas and material are divided by a separator, vacuum suction. Compared with other material transportation mode, vacuum adsorption device of the method is simple, cover an area of an area small, absorption material transporting, reliable and easy to operate. It can focus on several places to a place, or from one place to another place. Several scattered conveying, continuous discharge and intermittent discharge; The whole system is in a state of negative pressure in the work, no dust, good working environment. On the contrary, the disadvantage is that the wear and tear of high energy consumption and the elbow is more serious. Abroad, however, some of the equipment has passed on the inner wall of the bent pipe inserted into the soft rubber to solve.

depending on the degree of vacuum and vacuum pump, vacuum suction can be divided into high and low vacuum suction vacuum suction. High vacuum suction usually use of jet water pump and water ring pump as a power source. System high vacuum degree, usually for 5 * pa - 104 3 * 104 pa, air flow is small. Domestic sz - 4 water ring vacuum pump vacuum is 60. In %, the theory of the air flow is only 660 m3 / h. Commonly used low vacuum suction centrifugal fan and the fan as a source of power. System vacuum degree is low, usually for 9 * pa - 104 8 * 104 pa, conveying distance nearly so, not more than 50 m, but the volume is big, often is 7 17 - 17 1/2 fan. Used, the air volume is 1800 m3 / h.

vacuum cleaner has been widely used in home and abroad, from the large ship handling to the metallurgy and foundry of bulk material, and dust factory, the transportation of the brewery, dust removal, cleaning, ashing processing, this method can be used for shipping and handling bulk materials. It is reported that the vacuum suction device is produced by foreign manufacturers of special, finalize the design part of the whole system is standardization and seriation.

2。 The main types of vacuum suction system and composition of

these are high vacuum suction system as an example to introduce the main equipment in the system.

1。 Nozzle device is simple, but it is critical. Usually, the nozzle in the bulk material. There are two main types, one is single cylinder, the other is a duplex. When the system is evacuated, the atmosphere through the material of primary air, secondary air openings through the nozzle body, make the material into the feed tube. Both in single cylinder and double cylinder, must adjust the secondary air flow of the nozzle. It can be through the actual explore and adjust to the best position.

2。 Separator is usually a separator, it will vacuum suction system of material pipe of bulk material and powder material separately. Common is centrifugal separator and gravity, the gravity model has a simple structure and a small amount of air. Material of 95% of the bulk material and powder are separated into separate silos, with a small amount of dust gas into the dust bin.

3。 D collector to make sure that the exhaust emission system accord with environmental protection standards, reduce wear dust gas for the vacuum pump, gas needs by cyclone and isolated from the water bath dust catcher. Need to keep some of the water, water bath filter inlet pipe in the water, dust and air flow deposits in the water, after purification, the air flow into the water ring pump.

4。 Vacuum pump in the high vacuum pumping system with SZ type water ring vacuum water pump, water ring vacuum water pump noise is small, the vacuum degree was 60%, the highest vacuum pumping system efficiency.

5。 Tube and the valve piping with water and gas pipe and seamless steel pipe, pipeline wall thickness should not be less than 4 mm - 6 mm, in order to reduce the vacuum pressure loss, the bend radius should not less than 6 times of pipe inner - 10 times. Tracheal diameter can equal to the material of pipe diameter or for 0. Eight times.

vacuum conveying system of valve for high air tightness, otherwise will affect the pumping ability, generally adopts the ball valve and spider valve, require continuous discharge, unfavorable use star feeder, heavy hammer lock machine etc. , surface adopts double cone sealing gate is better.

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