The current range can be divided into European, Chinese and near-suction (side suction). Among them, the Chinese style can be divided into thin and simple. In the simple type, it is divided into deep and sub-deep types. The number of motors and wind wheels can be divided: two-machine and single-machine (ie double-barrel and single-cylinder). It can be divided by suction: top suction and side suction (including oblique suction). From the stoppage and draining method, it can be divided into double oil road and three oil road (air chamber drain oil, protective cover drain oil and air transport drain oil). The structure of the smoke collecting chamber is divided into a single layer (three oil road), a double inner inner type (double oil circuit), a near suction type, also called a side suction type and the like.
Divided by means of purifying air
It can be divided into two types, one is the deoiling and venting type, which discharges the polluting gas directly to the outside; the other is the adsorption and purification internal circulation type, which filters the contaminated gas and then discharges it back into the room. Because China's cooking methods are mainly based on cooking, and there are more oils, the internal circulation machine is not suitable, and most of them produce outrigger machines.
According to the model of the fan
Range hood can be divided into
Both axial flow and centrifugal. The axial flow fan is generally equipped with a shallow cover, which has a large air volume and a small wind pressure; the centrifugal fan has a large wind pressure. The range hoods currently on the market are mainly centrifugal, so there is not much room for choice on the models. They are generally externally equipped with centrifugal fans. According to the structure, the range hoods are mainly of deep type and thin type, and semi-deep type, European style and pull type.
According to the number of motors
Range hoods are available in single and dual motors.
The characteristics of rope core drill pipe are "three highs and one low", that is, high drilling speed, long life of diamond bit, high time utilization rate, low labor intensity of workers, so it is widely used in geological prospecting, coal field exploration and other fields. Among the whole set of drilling tools, the most important and most valuable is the drill pipe. The quality of the drill pipe is directly related to the use of the advantages of rope core drilling, and is also vital to the accurate acquisition of geological data and the control of drilling costs.
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