Transmission shaft system of oil lubricated high speed airflow mill for high temperature environment working condition

Abstract

A kind of oil lubrication high-speed airflow mill transmission shaft system for high-temperature environment condition, including transmission shaft body, the transmission shaft body is equipped with heat dissipation structure;The utility model discloses a kind of oil lubrication high-speed airflow mill transmission shaft system for high-temperature environment condition, by heat dissipation structure, integrated annular water-cooling cavity, high-temperature oil bath lubrication and three-level combined sealing system, build the efficient collaborative heat management and sealing protection system, first, annular forced water cooling channel can directly efficiently take away bearing friction heat and external radiation heat, ensure that bearing operating temperature is stably maintained within safe range;Second, full synthetic high-temperature lubricating oil forms reliable lubricating film while auxiliary heat dissipation, and external cooling system forms double heat control mechanism;Third, the multistage sealing system of mechanical barrier, positive pressure air curtain and rotary seal, solve the problem of lubricating oil leakage and dust invasion under high-temperature condition;Overall realizes long-term stable operation under high-speed high-temperature harsh environment.

Description

Technical Field

[0001] This utility model relates to the technical field of ultrafine powder processing equipment, specifically to an oil-lubricated high-speed airflow mill transmission shaft system for high-temperature environments. Background Technology

[0002] Under the dual challenges of high-speed rotation and high-temperature environment, the drive shaft system of an air jet mill experiences rapid heat accumulation in the bearing components due to continuous friction. If this heat cannot be dissipated in a timely and effective manner, it can easily lead to problems such as sudden temperature rise, lubrication failure, or even equipment jamming. Especially in the harsh conditions of continuous pulverization of ultrafine powder materials at high temperatures, bearing thermal management has become a core factor determining the stability and service life of the equipment.

[0003] Currently, the most common cooling methods in the industry include water cooling and natural air cooling. However, compared to the more efficient oil cooling system, both of these solutions have their own limitations. Although water cooling systems have high cooling efficiency, they face problems such as easy scaling of pipes, high risk of corrosion, and easy condensation of water vapor in high-temperature areas. Long-term use may affect cooling stability and equipment safety. On the other hand, although natural air cooling is simple in structure and easy to maintain, its heat dissipation capacity is significantly affected by ambient temperature. In high-temperature workshops or under continuous high-load conditions, it is often difficult to meet the continuous heat dissipation requirements of bearings, which can easily lead to heat accumulation and thus affect the reliability of shaft operation. Utility Model Content

[0004] In order to solve the above-mentioned problems in the existing technology, the purpose of this utility model is to provide an oil-lubricated high-speed airflow mill transmission shaft system for high-temperature working conditions.

[0005] The technical solution adopted in this utility model is as follows: A transmission shaft system for an oil-lubricated high-speed air jet mill used in high-temperature environments includes a transmission shaft body with a heat dissipation structure. The heat dissipation structure includes a cylindrical outer shell, a bearing on the cylindrical outer shell, an oil inlet on the cylindrical outer shell, an oil outlet on the cylindrical outer shell, a liquid inlet on the cylindrical outer shell, a liquid outlet on the cylindrical outer shell, an annular cooling chamber on the cylindrical outer shell, a rotary seal on the cylindrical outer shell, a first air seal cover on the cylindrical outer shell, a second air seal cover on the cylindrical outer shell, an air inlet on the second air seal cover, and an overflow hole on the cylindrical outer shell.

[0006] Preferably, a baffle is provided inside the outer shell of the cylinder.

[0007] Preferably, the rotary seal comprises two Teflon high-temperature resistant double-lip rotary oil seals and one Teflon high-temperature resistant double-lip rotary gas seal.

[0008] Preferably, the drive shaft body is provided with a groove.

[0009] Preferably, the outer shell is provided with a measuring hole.

[0010] Preferably, the outer shell is provided with mounting holes.

[0011] The beneficial effects of this utility model are as follows: As a transmission shaft system for a high-speed airflow mill with oil lubrication used in high-temperature environments, this utility model, through its heat dissipation structure, integrates an annular water-cooled cavity, high-temperature resistant oil bath lubrication, and a three-stage combined sealing system to construct a highly efficient and synergistic thermal management and sealing protection system. Its core beneficial effects are reflected in the following: First, the annular forced water-cooling channel can directly and efficiently remove bearing frictional heat and external radiant heat, ensuring that the bearing operating temperature is stably maintained within a safe range; Second, the fully synthetic high-temperature resistant lubricating oil assists in heat dissipation while forming a reliable lubricating film, forming a dual thermal control mechanism with the external cooling system; Third, the multi-stage sealing system composed of mechanical barrier, positive pressure air curtain, and rotary seal solves the problems of lubricating oil leakage and dust intrusion under high-temperature conditions; Fourth, each component of the system is specifically selected and designed for high-temperature conditions, achieving long-term stable operation in harsh high-speed, high-temperature environments, significantly improving equipment reliability, extending maintenance cycles, and ensuring the stability of continuous production. Attached Figure Description

[0012] The present invention will now be described in further detail with reference to the accompanying drawings and specific implementation methods.

[0013] Figure 1 This is a partial cross-sectional view of the transmission shaft system of an oil-lubricated high-speed airflow mill for high-temperature environments according to the present invention. Figure 2 This is a cross-sectional structural schematic diagram of a transmission shaft system for an oil-lubricated high-speed airflow mill used in high-temperature environments according to this utility model. In the diagram: 1. Drive shaft, 2. Shell, 3. Oil inlet, 4. Oil outlet, 5. Liquid inlet, 6. Liquid outlet, 7. Bearing, 8. Annular cooling chamber, 9. Mounting hole, 10. Groove, 11. Rotary seal, 12. Air inlet, 13. First air seal cover, 14. Baffle, 15. Overflow hole, 16. Measuring hole, 17. Second air seal cover. Detailed Implementation

[0014] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the present utility model and are not intended to limit the present utility model; that is, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The components of the embodiments of the present utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0015] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0016] The following is combined with Figure 1-2This invention describes a specific embodiment of an oil-lubricated high-speed airflow mill transmission shaft system for high-temperature environments. The system includes a transmission shaft body 1, a heat dissipation structure comprising a cylindrical outer shell 2, a bearing 7 mounted on the outer shell 2, an oil inlet 3, an oil outlet 4, a liquid inlet 5, a liquid outlet 6, an annular cooling chamber 8, a rotary seal 11, a first air seal cover 13, a second air seal cover 17 with an air inlet 12, and an overflow hole. 15. The oil inlet 3 can vent air. When heat dissipation is required, allow cooling water to flow from the liquid inlet 5 on the outer shell 2 into the internal annular cooling chamber 8, ensuring it can flow smoothly out from the liquid outlet 6, establishing a forced circulation cooling path. The liquid inlet 5 and liquid outlet 6 are connected to the external circulation cooling system. Open the oil inlet 3 at the top of the cylinder and add the specified fully synthetic high-temperature resistant lubricating oil into the internal chamber of the cylinder until oil overflows from the side overflow hole, indicating that the oil level has reached the design height. At this time, tighten the overflow hole plug and the oil inlet 3. Simultaneously, connect and turn on the clean air source of the external air seal system, and introduce low-pressure compressed air or inert gas into the air inlet 12 on the outer shell 2. The gas passes through the evenly distributed channels in the annular air seal cover, forming a stable positive pressure air curtain barrier around the shaft. Finally, manually rotate the shaft to confirm that it rotates flexibly without jamming, start the drive motor, and drive the drive shaft 1 to start rotating via the belt. As the rotational speed of the drive shaft 1 smoothly increases to the operating speed, in the lubrication system, the lubricating oil in the oil bath is carried up and splashed by the rotating drive shaft 1 and bearing 7, fully lubricating the internal angular contact ball bearing 7 and roller bearing 7, forming a protective oil film, and beginning to absorb the frictional heat generated by the operation of the bearing 7. In the cooling system, the cooling water continuously circulating in the annular cooling chamber 8 efficiently absorbs and removes two key heat sources through the metal wall of the cylinder: one is the internal frictional heat transferred from the lubricating oil and bearing 7; the other is the external radiant heat conducted from the high-temperature grinding chamber through the cylinder. The first air seal 13 physically blocks large dust particles, and the positive pressure air curtain continuously blown out by the air inlet 12 on the second air seal 17 effectively prevents further intrusion of fine dust and helps to isolate the hot airflow. The rotary seal 11 ensures that the lubricating oil in the bearing 7 cavity does not leak outward and prevents external impurities from entering. Under this synergistic effect, the system's heat input and cooling output reach a dynamic balance.

[0017] Advantageously, the outer shell 2 of the cylinder is provided with a baffle 14, which can effectively block the oil splashing caused by the high-speed rotating parts, prevent the lubricating oil from abnormally escaping from the oil inlet 3 or the sealing gap due to centrifugal force, thereby ensuring stable oil level, continuous and reliable lubrication, and reducing pollution and loss caused by oil mist overflow.

[0018] Advantageously, the rotary seal 11 includes two Teflon high-temperature resistant double-lip rotary oil seals and one Teflon high-temperature resistant double-lip rotary gas seal. This design achieves efficient sealing of the lubricating oil in the bearing 7 cavity under high-speed rotation conditions through the synergistic effect of the oil seal and the gas seal, effectively preventing the lubricating medium from leaking out, and at the same time blocking the intrusion of external dust, water vapor and other impurities, ensuring the cleanliness of the transmission cavity and the long-term stable operation of the lubrication system.

[0019] Advantageously, the transmission shaft is provided with grooves 10, which together with the shaft surface form periodically changing geometric features, converting the rotational motion of the shaft into continuous and stable electrical pulse signals, thereby realizing real-time and accurate detection and monitoring of the transmission shaft speed, and providing key data for equipment operation control and condition diagnosis. Advantageously, the outer shell is provided with a measuring hole 16. This hole is precisely positioned and machined to be used to fit a non-contact speed sensor. The mounting hole 9 is strictly aligned with the groove 10 on the drive shaft to ensure that the sensor can accurately capture the periodic pulse signal generated when the shaft rotates, thereby achieving high-precision, real-time speed monitoring and providing reliable data support for equipment operation status analysis and control system feedback.

[0020] Advantageously, the outer shell is provided with a mounting hole 9, which is optimized for the secure installation of contact temperature sensor probes such as platinum resistance thermometers. The sensor can directly approach or contact the shell surface of the outer ring area of ​​the bearing 7 through this mounting hole 9, thereby monitoring the operating temperature of the bearing 7 in real time and accurately, and transmitting the signal to the control system to achieve continuous monitoring of the thermal state of the bearing 7 and overheat protection.

[0021] Working principle of this utility model: When heat dissipation is required, allow cooling water to flow from the inlet 5 on the outer shell 2 into the internal annular cooling chamber 8, ensuring it flows smoothly out from the outlet 6 to establish a forced circulation cooling path. Connect the inlet 5 and outlet 6 to the external circulation cooling system. Open the oil inlet 3 at the top of the shell and add the specified fully synthetic high-temperature resistant lubricating oil into the internal chamber until oil overflows from the side overflow hole, indicating the oil level has reached the design height. At this point, tighten the overflow hole plug and the oil inlet 3. Simultaneously, connect and turn on the clean air source of the external air seal system, introducing low-pressure compressed air or inert gas into the air inlet 12 on the outer shell 2. The gas passes through the evenly distributed channels within the annular air seal cover, forming a stable positive pressure air curtain barrier around the shaft. Finally, manually rotate the shaft to confirm it rotates freely without jamming. Start the drive motor, and the drive shaft 1 will begin to rotate via the belt. As the rotational speed of the drive shaft 1 smoothly increases to the operating speed, in the lubrication system, the lubricating oil in the oil bath is carried up and splashed by the rotating drive shaft 1 and bearing 7, fully lubricating the internal angular contact ball bearing 7 and roller bearing 7, forming a protective oil film, and beginning to absorb the frictional heat generated by the operation of the bearing 7. In the cooling system, the cooling water continuously circulating in the annular cooling chamber 8 efficiently absorbs and removes two key heat sources through the metal wall of the cylinder: one is the internal frictional heat transferred from the lubricating oil and bearing 7; the other is the external radiant heat conducted from the high-temperature grinding chamber through the cylinder. The first air seal 13 physically blocks large dust particles, and the positive pressure air curtain continuously blown out by the air inlet 12 on the second air seal 17 effectively prevents further intrusion of fine dust and helps to isolate the hot airflow. The rotary seal 11 ensures that the lubricating oil in the bearing 7 cavity does not leak outward and prevents external impurities from entering. Under this synergistic effect, the system's heat input and cooling output reach a dynamic balance.

[0022] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0023] The above description is merely an example and illustration of the structure of this utility model. Those skilled in the art can make various modifications or additions to the specific embodiments described or use similar methods to replace them, as long as they do not deviate from the structure of the utility model or exceed the scope defined in the claims, they should all fall within the protection scope of this utility model.

Claims

1. A transmission shaft system for an oil-lubricated high-speed airflow mill used in high-temperature environments, comprising a transmission shaft body, characterized in that, The drive shaft is provided with a heat dissipation structure, which includes a cylindrical outer shell, a bearing on the cylindrical outer shell, an oil inlet on the cylindrical outer shell, an oil outlet on the cylindrical outer shell, a liquid inlet on the cylindrical outer shell, a liquid outlet on the cylindrical outer shell, an annular cooling chamber on the cylindrical outer shell, a rotary seal on the cylindrical outer shell, a first air seal cover on the cylindrical outer shell, a second air seal cover on the cylindrical outer shell, an air inlet on the second air seal cover, and an overflow hole on the cylindrical outer shell.

2. The transmission shaft system for an oil-lubricated high-speed airflow mill in a high-temperature environment according to claim 1, characterized in that, The outer shell of the cylinder is equipped with a baffle plate.

3. The transmission shaft system for an oil-lubricated high-speed airflow mill in a high-temperature environment according to claim 1, characterized in that, The rotary seal (11) includes two Teflon high-temperature resistant double-lip rotary oil seals and one Teflon high-temperature resistant double-lip rotary gas seal.

4. The transmission shaft system for an oil-lubricated high-speed airflow mill in a high-temperature environment according to claim 1, characterized in that, The drive shaft (1) is provided with a groove.

5. The transmission shaft system for an oil-lubricated high-speed airflow mill in a high-temperature environment according to claim 1, characterized in that, The outer shell of the cylinder is provided with a measuring hole.

6. The transmission shaft system for an oil-lubricated high-speed airflow mill in a high-temperature environment according to claim 1, characterized in that, The outer shell of the cylinder is provided with mounting holes.

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