CN114810657A - Bearing seat structure of fan - Google Patents

Abstract

The invention discloses a fan bearing seat structure which comprises a transmission shaft, a fan bearing seat shell, end covers and a through hole in the middle of the fan bearing seat shell, wherein two deep groove ball bearings are installed on the transmission shaft, the positioning of inner rings of the deep groove ball bearings is realized by steps on the transmission shaft, the outer rings of the deep groove ball bearings are positioned by the end covers at two ends after the transmission shaft is installed on the fan bearing seat shell, and a plurality of ventilation holes communicated with the through hole are formed in the fan bearing seat shell along the circumferential direction. When the fan operates, the transmission shaft rotates to drive airflow in the cavity to rotate, the airflow flows out of the newly arranged ventilation holes, the heat generated by rotation of the deep groove ball bearing is taken away, the heat dissipation is utilized, the temperature in the cavity is reduced, and the service life of the bearing and the fan shaft is prolonged.

Description

A fan bearing seat structure

technical field

The invention relates to the technical field of bearing seats, in particular to a fan bearing seat structure.

Background technique

ZJ17 cigarette making machine is composed of YJ17 cigarette making machine and YJ27 type tipping machine. The wind system of the YJ17 cigarette machine is mainly composed of a high-pressure fan, a low-pressure fan, a wind wire feeding pipe, and a wind dust removal pipe. The technical performance of the high-pressure fan is: air volume 1900m3/h, wind pressure 9600Pa, speed 6300r/min, power 5.5kW, the high-pressure fan mainly provides enough negative pressure for the machine and undertakes the task of dust removal to ensure that enough negative pressure is generated to meet the Production.

The wind power system of the YJ27 type mounting machine consists of three parts: the main fan system, the vacuum pump system and the cleaning fan system. Main parameters of the main fan: air volume 1200m3/h, air pressure 9600Pa, motor power 7.5KW, speed 6750r/min. The main function of the main fan system is to provide negative pressure suction for the drum train.

At present, the high-pressure fan and the main fan of the ZJ17 cigarette machine have the same installation and adjustment methods and working conditions, and the bearing seat structure and lubrication method are exactly the same.

The existing fan bearing seat structure is mainly composed of a transmission shaft, two deep groove ball bearings of type 6206, a fan bearing seat shell, grease in the shell, an end cover, an impeller, a pulley, and the like. The fan bearing seat is installed on the machine base by 4 screws, the middle of the bearing seat is a through hole, and 2 bearings are installed on the transmission shaft. The positioning of the inner ring of the bearing on the shaft is realized by the steps on the transmission shaft, and the transmission shaft is installed on the bearing seat. Afterwards, the outer ring of the bearing is positioned through the end caps at both ends. The motor drive pulley is installed on the left side of the drive shaft, the fan impeller is installed on the right side of the drive shaft, and the outer ring of the bearing seat has a grease filling port.

The lubrication method of the fan bearing is a strong filling type. When installing the bearing, the inner sealing cover must be removed. Use a grease gun to press the grease into the cavity of the bearing seat from the filling port of the grease to fully fill the bearing raceway and overflow. Lubricate the fan bearings in the same way.

According to the statistics on the failure frequency of the fans of the ZJ17 coiling unit, the data shows that each group of equipment needs an average of 4.8 fan maintenance operations per year.

Checking the maintenance records, each maintenance operation requires at least two maintenance technicians to participate in the disassembly, installation and debugging, and the operation time is about 1.5h.

When the fan fails, the appearance is that the vibration increases, high noise is generated, the increase of the load causes the temperature of the bearing housing to rise, or even the fan does not rotate and stops working.

After the maintenance personnel removed the faulty fan and disassembled the bearing housing, the inspection found:

(1) The external temperature of the fan bearing seat is relatively high, and the temperature measured by an infrared thermometer reaches 80°C-90°C;

(2) The temperature in the housing of the fan bearing housing is greater than 180°C, which causes the grease to change from a solid state to a liquid state;

(3) Near the impeller end bearing, the cage is damaged, the ball is worn and deformed, and it is poor lubrication;

(4) The surface of the bearing ball near the pulley end is fatigued and worn and the lubricating oil accumulates, which is excessive lubrication;

(5) The inner ring of the bearing is engaged with the shaft. After the strong disassembly, the fan shaft cannot be reused.

According to the lubrication management and planning of the equipment: the NBU12 bearing grease used in the deep groove ball bearing of the fan has a melting point greater than 180°C. The fan bearing needs to press grease into the grease nipple after 2500 hours of operation, and the deep groove ball bearing should also be cleaned and re-greased. However, the equipment operates normally for 16 hours a day, so according to the lubrication management and plan, it should be lubricated for half a year. Since the fan frequently fails in the actual use process, in the actual maintenance process, the lubrication cycle of the large fan bearing is shortened to one month, but Before the use time has reached 2.5 months, the fan bearing has been damaged and cannot continue to work, thus failing to meet the production process requirements. It is not feasible to increase bearing life by shortening the lubrication cycle.

After the inventor's research, it is found that the failure cause analysis:

1. The amount of grease filling is large, and the heat is generated.

The lubrication method of the original fan bearing is a strong filling type, the grease fills the entire enclosed space inside the bearing seat, and the heat generated by the internal friction of the grease is very high during high-speed rotation.

2. The working environment is poor, which is not conducive to heat dissipation.

The bearing housing shell is designed with unequal thickness, the thinnest part is 10mm, and the thickest part is 20mm. During the use of the fan, the machine works continuously for 16 hours, and the heat generated by the grease inside the bearing housing must be dissipated through the housing. It is not easy; the fan is installed inside the equipment and protected by a shield with sound insulation cotton, and the internal heat dissipation conditions of the machine are poor. Under such working conditions, the equipment runs continuously, the temperature inside the bearing seat increases by more than 180°C, and a large amount of grease in the cavity melts into a liquid state with certain fluidity, which destroys the lubrication balance of the grease to the two bearings.

3. Over-lubrication or poor lubrication cause bearing damage.

In classical mechanics, "centripetal force" is the resultant external force directed to the center of the circle when an object moves along a circle or a curved orbit. This effect can be produced by any force among elastic force, gravity, and friction, or by several forces. The resultant force of a single force or the component force of several forces is provided. For objects in a non-inertial frame of relative rotation, under the action of "centripetal force", the angular velocity of one end of the impeller of the fan is greater than that of the other end of the pulley, and the lubricating oil will rotate and accumulate in the direction of the impeller, causing the bearing at one end of the impeller to be over-lubricated, and the bearing at one end of the pulley. Lack of lubrication for dry lubrication. After the fluid lubricating film is destroyed, a very thin oil film still exists on the contact surface. This film has a special binding force between the film and the friction surface, and the formed "film" continues to protect the friction to a certain extent. The role of the surface, this lubrication state is called boundary lubrication. The resulting oil film is called the boundary film. If the load is extremely large, the pressure on the convex peak of the friction surface will be too large, which will cause the adsorption film to rupture, resulting in direct contact between the friction surfaces, resulting in dry friction.

Therefore, the bearing on the over-lubricated end has serious poor heat dissipation, the shaft and bearing are deformed by heat, the load increases, and the bearing is stuck, which is consistent with the occurrence of the occlusion of the inner ring of the bearing and the shaft; the bearing on the dry friction end, the heating phenomenon will also be prominent, The more appearance is the fatigue pitting corrosion of balls and ballistics. When it is serious to a certain extent, the bearing falls apart and loses its function.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a fan bearing seat structure, in order to solve the technical problems existing in the background art.

The technical scheme adopted in the present invention is as follows:

A fan bearing seat structure comprises a transmission shaft, a fan bearing seat shell, an end cover, and a through hole in the middle of the fan bearing seat shell, two deep groove ball bearings are installed on the transmission shaft, and deep grooves are realized by steps on the transmission shaft The positioning of the inner ring of the ball bearing. After the drive shaft is installed on the fan bearing housing shell, the outer ring of the deep groove ball bearing is positioned through the end covers at both ends. The fan bearing housing housing is provided with a number of holes in the circumferential direction. open ventilation holes.

In some embodiments, the number of the ventilation holes is 6-10, and the ventilation holes are arranged at equal intervals.

In some embodiments, the number of the ventilation holes is 8, and the 8 ventilation holes are arranged in a ring at equal intervals.

In some embodiments, the ventilation holes are opened on the fan bearing housing housing between the two deep groove ball bearings.

In some embodiments, the ventilation holes are 10-20 cm in diameter.

In some embodiments, a motor drive pulley is installed on the left side of the transmission shaft, and a fan impeller is installed on the right side of the transmission shaft.

Description of drawings

1 is a schematic structural diagram of the fan bearing seat structure of the present embodiment;

2 is a schematic diagram of the ventilation holes of the fan bearing housing housing of the present embodiment;

Illustration description: 1-fan bearing housing, 2-ventilation hole, 3-deep groove ball bearing, 4-end cover, 5-transmission shaft.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present application more clearly understood, the present application will be described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, but not to limit the present application.

On the contrary, this application covers any alternatives, modifications, equivalents and arrangements within the spirit and scope of this application as defined by the claims. Further, in order for the public to have a better understanding of the present application, some specific details are described in detail in the following detailed description of the present application. The application can be fully understood by those skilled in the art without the description of these detailed parts.

A fan bearing seat structure involved in the embodiment of the present application will be described in detail below with reference to FIGS. 1-2 . It should be noted that the following examples are only used to explain the present application and do not constitute a limitation to the present application.

In the embodiment of the present application, as shown in Figures 1-2, a fan bearing seat structure includes a transmission shaft 5, a fan bearing seat shell 1, an end cover 4, and a through hole in the middle of the fan bearing seat shell 1. Two deep groove ball bearings 3 are installed on the shaft 5, and the inner ring of the deep groove ball bearing 3 is positioned by the steps on the transmission shaft 5. After the transmission shaft 5 is installed on the fan bearing housing 1, it is realized by the end covers 4 at both ends. The outer ring of the deep groove ball bearing 3 is positioned, and the fan bearing housing 1 is provided with a plurality of ventilation holes 2 in communication with the through holes in the circumferential direction. The motor drive pulley is installed on the left side of the transmission shaft 5 , and the fan impeller is installed on the right side of the transmission shaft 5 .

The present invention transforms the fan bearing seat shell 1 by modifying the fan bearing seat structure, drills 6-10 through holes evenly in the circumferential direction at the original lubricating grease filling port position, and replaces the original closed fan bearing seat shell 1 as a Through-hole design enhances heat dissipation and improves bearing service life.

In some embodiments, the number of the ventilation holes 2 is 6-10, preferably 8, and the 8 ventilation holes 2 are arranged in a ring at equal intervals. The diameter of the ventilation hole 2 is 10-20 cm, preferably 16 cm, and the ventilation hole 2 is opened on the fan bearing housing housing 1 between the two deep groove ball bearings 3 .

The present invention cancels the lubricating grease strongly filled in the fan bearing seat cavity, and before the deep groove ball bearing 3 is installed on the transmission shaft 5, the lubricating grease is added into the bearing cavity and the inner sealing cover is installed. Install the inner sealing cover of the deep groove ball bearing 3, which must be removed when installing the bearing, on the inner cavity of the deep groove ball bearing 3, so as to prevent the grease of the bearing from flowing out after being melted into a liquid state at a high temperature, and dry lubrication will lead to the bearing. The problem of aggravating the damage occurs and the poor lubrication of the bearing is avoided.

The fault statistical analysis of the improved fan bearing seat provided by the present invention is as follows. The 10# cigarette machine adopts the newly designed bearing seat for trial operation and has not been damaged so far, and the service life of the bearing and the shaft is extended by more than 4.4 times. After promotion and use in the workshop, in June 2021, a statistical analysis of fan failures was conducted, and the number of fan failures was significantly reduced, from 4.8 failures per year before improvement to 1.1 per year after improvement. It has achieved a positive effect on improving the operating efficiency of the equipment and reducing the cost of accessories. After financial accounting, this transformation has brought nearly 2 million benefits to the factory every year.

The possible beneficial effects of the fan bearing housing structure disclosed in this application include, but are not limited to:

(1) Reduce about 90% of the lubricating grease in the fan bearing seat cavity. The heat generated by the bearing seat mainly comes from the internal friction of the lubricating grease, reducing a large amount of heat energy generated by the full filling method of the lubricating grease in the fan bearing seat cavity.

(2) When the fan is running, the rotation of the drive shaft drives the airflow inside the cavity to rotate, and the airflow flows out from the newly arranged ventilation holes, taking away the heat generated by the rotation of the deep groove ball bearing, using heat dissipation to reduce the temperature inside the cavity, extending the bearing and Service life of the fan shaft.

The above descriptions are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention shall be included in the protection of the present invention. within the range.

Claims (6)

1. The utility model provides a fan bearing frame structure, a serial communication port, be the through-hole including transmission shaft (5), fan bearing frame casing (1), end cover (4), fan bearing frame casing (1) centre, install two deep groove ball bearing (3) on transmission shaft (5), lean on the step on transmission shaft (5) to realize the location of deep groove ball bearing (3) inner circle, the outer lane location of deep groove ball bearing (3) is realized through end cover (4) at both ends to transmission shaft (5) after installing on fan bearing frame casing (1), fan bearing frame casing (1) along circumference seted up a plurality of with ventilation hole (2) that the through-hole is linked together.

2. A bearing housing structure for a draught fan according to claim 1, wherein the number of said ventilation holes (2) is 6-10, and said ventilation holes (2) are arranged at equal intervals.

3. A bearing housing structure for a draught fan according to claim 1, wherein the number of the ventilation holes (2) is 8, and the 8 ventilation holes (2) are arranged in an annular shape at equal intervals.

4. A fan bearing housing structure according to any of claims 1-3, characterized in that the ventilation holes (2) are opened in the fan bearing housing (1) between two deep groove ball bearings (3).

5. A bearing housing structure for a draught fan according to any one of claims 1 to 3, wherein the diameter of the vent holes (2) is 10-20 cm.

6. A bearing support structure for a blower fan according to any one of claims 1-3, characterized in that the left side of the transmission shaft (5) is provided with a motor transmission pulley, and the right side of the transmission shaft (5) is provided with a blower fan impeller.

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