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There are many other key parameters of screw air compressor server

Source: essens air compressor Time of publication: April 16, 2020 tag: Small in large

There are many other key parameters of twin screw air compressor server

In theory, there is no limit on the number of teeth of positive and negative motor rotor of screw air compressor server, but in the specific application, the selection plan considering various factors is generally concentrated in the middle of 3:3 ~ 10:11.

The most common ones are: 3:4, 4:5, 4:6, 5:6, 5:7, 6:8, especially the 4:6 And 5:6 planning scheme is more widely used in screw air compressor. In general screw air compressor, it tends to choose 5:6 tooth number composition, and in basic refrigeration screw compressor, it tends to choose 5:7 tooth number composition.

PS. in many marketing promotion documents of screw air compressor, the manufacturers of servers with 4:6 And 5:6 tooth ratio are in conflict with each other.

As a matter of fact, the two tooth ratios are different. It depends on which aspect is more important, so there is no need to worry about it.

When the positive and negative motor rotor is engaged, the positive motor rotor is actively driven by the female motor rotor, and the tooth of the positive motor rotor must be more rigid.
 Screw air compressor

Therefore, the positive motor rotor must have a large diameter, and the number of teeth of the positive motor rotor is less than that of the negative motor rotor.

Naturally, the number of teeth of the motor rotor is related to the material of the rotor, the ratio of length to diameter and the working pressure of the exhaust pipe.

Question: screw air compressor server motor rotor diameter and length diameter ratio

A:

The diameter of the server motor rotor, which is generally used to show the value of their products in marketing promotion.

The key theoretical significance is that the total capacity flow of screw compressor is directly proportional to the square meter of motor rotor diameter.

Therefore, the general name of marketing promotion is:

The server with large diameter has large capacity and total flow, so the speed ratio can be very low, and the equipment will be more durable.

If there is a slight contradiction in this kind of name, people can see the loopholes

That is, the server diameter is large and the traffic is large. Why reduce the speed ratio to consider the lower total traffic?

What's more, there is no appropriate server application in this total traffic segment, and only a large number of servers with reduced features can be applied to meet the requirements.

In fact, compared with the independent main parameter of motor rotor diameter, we can not get the basis whether the server is excellent or not.

In a large number, the establishment of motor rotor diameter is the result of continuous balanced concession to keep the commodity generalization, standardization and practicality.

At present, the motor rotor diameter range is between 40 ~ 84mm.

But the diameter of most motors is less than 300 mm.

The first reason is that the production cost is too high, and the second is that the available surface is narrow, and it is more feasible to maintain large flow rate by using several series or centrifugal dehydrators.

Motor rotor diameter size, an automobile manufacturer does not have too many specifications and models.

Under the best speed ratio (tooth top speed), it is the standard of all automobile manufacturers that the motor rotor diameter should be avoided as far as possible to consider the scope of total flow capacity.

In general, several different length diameter ratios are selected for a motor rotor diameter to keep the total capacity flow requirement as wide as possible.

In general, the ratio of rotor diameter to rotor diameter is 2.0.

Under the same rotor diameter, choosing a higher aspect ratio is beneficial to reduce the manufacturing cost and to manufacture servers with large capacity and total flow.

In the same motor rotor diameter, choose a smaller length diameter ratio can bear higher pressure difference, can achieve higher exhaust pipe working pressure.

Bearing higher pressure difference is also related to human body structure and common raw materials.

Such as steel castings, ductile iron castings, steel castings and other different raw materials.

The key factors to be considered are the bending stiffness of the motor rotor and the deformation of mechanical equipment. The server with large aspect ratio will have higher requirements on these aspects.

The ratio of length to diameter of raw materials can be larger, and the diameter can be made smaller and thinner.
 Screw air compressor

If the raw materials are poor, the length diameter ratio of the motor rotor is only a little smaller, and the diameter of the motor rotor will certainly become larger and shorter.

What's the significance of comparing the rotor diameter of the motor?

Q: screw air compressor server speed ratio and tooth top speed

A:

When it comes to the speed ratio of screw air compressor, the layman always thinks of the rated power of the motor. If you are more professional in technology, you will know the specific speed ratio of the rotor of the positive motor according to the speed increase and decrease of the transmission gear.

How to determine the specific speed of the server?

The definite speed ratio is biased to an index value, that is, the tooth top speed of the server.

What is the tooth tip rate? V is the speed value on the tooth tip circle of the rotor of the positive motor.

This value is related to the motor rotor profile, pressure difference, working pressure ratio, total capacity flow, steam characteristics, gap, operation method and other factors. The server has the maximum reduction efficiency under a certain optimal tooth top rate. For example, if the best tooth top rate is offset, many conditions may not easily cause damage to the mechanical equipment or be invalid, but it will cause damage to the mechanical equipment High efficiency reduction, noise and vibration expansion.

In the whole equipment design scheme, according to the characteristic specification presented by the automobile manufacturer, according to the selection of very few motors with different gear transmission, the whole equipment factory can ensure that the tooth top speed is within the scope of the best tooth top rate and reach a certain total flow and working pressure.

Naturally, nowadays, the whole equipment factory does not necessarily calculate the tooth tip rate. The rotor speed ratio and the tooth tip rate of the Yang motor are one-to-one corresponding. Only the proper rotor speed ratio of the positive motor can be selected according to the characteristic curve chart presented by the automobile manufacturer.

The gear top speed ratio of oil pump extruder screw is generally 10 ~ 20m / s, and that of oil free extruder is about 50 ~ 100M / s.

The rotor speed of positive motor is generally 700 ~ 10000 RPM than that of oil pump extruder screw, and that of oil free extruder is 3000 ~ 20000 rpm.

 

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