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Reasons and Judgment of Overhaul of Head Bearing of Air Compressor

Categories:Industry News
Author:
Origin:
Time of issue:2020-07-31
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(Summary description)
With the running time of the air compressor, each bearing of the main engine will inevitably wear, which will cause the screw to produce axial movement and increase the radial displacement. The gap between the end faces changes. These clearance changes are normal and permissible during the bearing life period, and the resulting air compressor air production decline and main motor load increase are also normal and permissible.

As the operating time of the unit approaches the overhaul period of the main engine, the life of the main engine bearing gradually tends to the maximum allowable time limit. At this time, the axial and radial movement of the screw gradually tends to the maximum design allowable value, and this change will greatly change the clearance between the screw and the screw, between the screw and the host shell and the front and rear surfaces. At this point the mainframe operation is still safe, but it is time to consider planning for a major overhaul of the mainframe. Because once the running time of the unit exceeds the overhaul period, the bearing wear and the matching clearance of the main engine will reach the limit value allowed by the technical conditions of the main engine. At this time, the main engine is in an unsafe operation state, and the following serious consequences may occur at any time:

1. The operating load of the main engine increases, causing harm to the main motor and electrical system

The possible strong friction between the screw of the host, between the screw and the front and rear faces, and between the screw and the shell of the host will cause the running load of the host to increase sharply, and the running load of the severely worn bearings is also very large. As a result, the motor will be in an overloaded working state, which will seriously endanger the safe operation of the motor. In severe cases, if the electrical protection device of the air compressor unit is insensitive or fails, it may also cause the motor to burn out.

2. The exhaust volume of the air compressor will be attenuated to a large extent.

The increase in the matching clearance of the main engine will lead to a serious reduction in the efficiency of the main engine, that is, the air compressor exhaust volume will have a large attenuation, which will have a certain impact on the normal production of the air unit. Especially for those users whose air compressor displacement configuration is relatively small, due to the attenuation of air compressor displacement, when the air consumption of the air system is relatively stable, the compressed air pressure of the pipe network will be greatly reduced, so It may occur that the gas system equipment cannot work normally or cannot work at all, thus affecting the normal production of the unit or causing a temporary shutdown, causing losses to the enterprise.

3. The most serious consequence is the sudden "locking" of the host.

Once such a situation occurs, if the electrical protection system does not respond in time or the protection fails, it may also cause serious damage to the main motor and electrical system.

For the handling of the "locking" of the host, on the one hand, the maintenance cost of the overhaul will be much more expensive than that of the normal overhaul. . And if the damage of the host has reached the point where it has no repair value or cannot be repaired at all, it can only be scrapped and replaced with a new host, and the direct loss is the greatest. Because the cost of newly purchased main engine is usually about one-third of the cost of purchasing the entire air compressor unit, which is much higher than the cost of overhauling the main engine under normal circumstances. But it's very close!

From the above analysis, it can be seen that the normal main engine overhaul work is not only the basic requirement for equipment maintenance, but also the basic requirement for enterprises to control normal equipment maintenance costs, avoid unnecessary capital losses and ensure the normal production of enterprises!

Therefore, it is not only necessary but also necessary to overhaul the air compressor main engine on time and according to the standard! Judgment that the main engine of the screw air compressor needs to be overhauled:

To be precise, the time for the main engine to be overhauled should be based on the expiration of the service life of the bearing, but in fact it is difficult to have an accurate indicator to judge whether the service life of the bearing is about to expire or has expired. The standard set by compressor manufacturers based on their practical experience of nearly a hundred years is to overhaul the main engine after 20,000 hours of compressor operation or 4 years.

In addition to the above general standards, based on experience, a more accurate judgment of the host status can be made from the following aspects:

1) The sound of the main engine running, especially whether there is any abnormal sound in the beari

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Reasons and Judgment of Overhaul of Head Bearing of Air Compressor

Categories:Industry News
Author:
Origin:
Time of issue:2020-07-31
Views:0

Information

With the running time of the air compressor, each bearing of the main engine will inevitably wear, which will cause the screw to produce axial movement and increase the radial displacement. The gap between the end faces changes. These clearance changes are normal and permissible during the bearing life period, and the resulting air compressor air production decline and main motor load increase are also normal and permissible.

As the operating time of the unit approaches the overhaul period of the main engine, the life of the main engine bearing gradually tends to the maximum allowable time limit. At this time, the axial and radial movement of the screw gradually tends to the maximum design allowable value, and this change will greatly change the clearance between the screw and the screw, between the screw and the host shell and the front and rear surfaces. At this point the mainframe operation is still safe, but it is time to consider planning for a major overhaul of the mainframe. Because once the running time of the unit exceeds the overhaul period, the bearing wear and the matching clearance of the main engine will reach the limit value allowed by the technical conditions of the main engine. At this time, the main engine is in an unsafe operation state, and the following serious consequences may occur at any time:

1. The operating load of the main engine increases, causing harm to the main motor and electrical system

The possible strong friction between the screw of the host, between the screw and the front and rear faces, and between the screw and the shell of the host will cause the running load of the host to increase sharply, and the running load of the severely worn bearings is also very large. As a result, the motor will be in an overloaded working state, which will seriously endanger the safe operation of the motor. In severe cases, if the electrical protection device of the air compressor unit is insensitive or fails, it may also cause the motor to burn out.

2. The exhaust volume of the air compressor will be attenuated to a large extent.

The increase in the matching clearance of the main engine will lead to a serious reduction in the efficiency of the main engine, that is, the air compressor exhaust volume will have a large attenuation, which will have a certain impact on the normal production of the air unit. Especially for those users whose air compressor displacement configuration is relatively small, due to the attenuation of air compressor displacement, when the air consumption of the air system is relatively stable, the compressed air pressure of the pipe network will be greatly reduced, so It may occur that the gas system equipment cannot work normally or cannot work at all, thus affecting the normal production of the unit or causing a temporary shutdown, causing losses to the enterprise.

3. The most serious consequence is the sudden "locking" of the host.

Once such a situation occurs, if the electrical protection system does not respond in time or the protection fails, it may also cause serious damage to the main motor and electrical system.

For the handling of the "locking" of the host, on the one hand, the maintenance cost of the overhaul will be much more expensive than that of the normal overhaul. . And if the damage of the host has reached the point where it has no repair value or cannot be repaired at all, it can only be scrapped and replaced with a new host, and the direct loss is the greatest. Because the cost of newly purchased main engine is usually about one-third of the cost of purchasing the entire air compressor unit, which is much higher than the cost of overhauling the main engine under normal circumstances. But it's very close!

From the above analysis, it can be seen that the normal main engine overhaul work is not only the basic requirement for equipment maintenance, but also the basic requirement for enterprises to control normal equipment maintenance costs, avoid unnecessary capital losses and ensure the normal production of enterprises!

Therefore, it is not only necessary but also necessary to overhaul the air compressor main engine on time and according to the standard! Judgment that the main engine of the screw air compressor needs to be overhauled:

To be precise, the time for the main engine to be overhauled should be based on the expiration of the service life of the bearing, but in fact it is difficult to have an accurate indicator to judge whether the service life of the bearing is about to expire or has expired. The standard set by compressor manufacturers based on their practical experience of nearly a hundred years is to overhaul the main engine after 20,000 hours of compressor operation or 4 years.

In addition to the above general standards, based on experience, a more accurate judgment of the host status can be made from the following aspects:

1) The sound of the main engine running, especially whether there is any abnormal sound in the bearing;
2) The motor running current, especially the difference between the no-load running current and the standard value;
3) The vibration of each bearing of the machine head.

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Previous: Use and maintenance of the motor

Next: Overview of common repair and maintenance of screw air compressors

Previous: Use and maintenance of the motor

Next: Overview of common repair and maintenance of screw air compressors

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