Thin oil tank water vapor isolation device, lubricating system and crowned tooth coupling

Abstract

The invention discloses a thin oil tank water vapor isolation device, a lubricating system and a crowned tooth coupling, and belongs to the technical field of mechanical transmission. The device comprises an isolation assembly, the isolation assembly comprises an isolation cover, the isolation cover is of a hollow cylindrical structure, one end of the isolation cover is connected with a thin oil tank, the other end of the isolation cover is open, and the caliber of the open end is larger than the maximum outer diameter of a connecting shaft of the crowned tooth coupling, so that the isolation cover can wrap the connecting shaft of the crowned tooth coupling in the circumferential direction; a spiral guide groove extending from the driving end to the driven end along the connecting shaft is formed in the inner surface of the isolation cover, and the spiral guide groove does not make contact with the circumferential surface of the wrapped connecting shaft. The gas supply assembly communicates with the interior of the isolation hood through a pipeline and can continuously supply dry compressed gas into the isolation hood; the dry compressed gas can form surrounding spiral gas flow on the surface of the crowned gear coupling connecting shaft along the spiral guide groove; the radial gap between the crowned tooth coupling connecting shaft and the thin oil tank is blocked, and water vapor is blocked outside the thin oil tank.

Description

Technical Field

[0001] The present invention belongs to the technical field of mechanical transmission, and more specifically, relates to a water vapor isolation device for a thin oil tank, a lubrication system, and a drum gear coupling. Background Art

[0002] Modern metallurgical production requires large-scale, high-efficiency, and high-precision rolling equipment, thus posing new challenges to the related spare parts industry. In the main drive system of a hot tandem mill finishing mill using a drum gear coupling structure, the drum gear coupling uses thin lubricating oil to lubricate the drum teeth, and the oil tank wraps the active end part of the drum gear coupling inside. However, since the drum gear coupling needs to change its working angle during operation, the radial clearance variation between the outlet of the thin oil tank and the coupling shaft of the drum gear coupling reaches dozens of millimeters, and a fixed seal cannot be set between the thin oil tank and the drum gear coupling. The on-site use environment is high temperature and high humidity (humidity is at least above 70%), and water vapor in the environment as shown in Figure 1 is easily introduced into the thin oil tank through the radial clearance between the two (the arrows in the figure indicate the direction of water vapor entry), resulting in emulsification and deterioration of the lubricating oil in the thin oil tank. On the one hand, the lubricating oil needs to be replaced irregularly, increasing the operating cost; on the other hand, the lubricating effect of the emulsified lubricating oil is reduced, and it cannot ensure effective lubrication of the drum gear coupling, easily causing abnormal wear of the tooth surface and shortening the service life.

[0003] To solve the above problems, some measures have been adopted in the prior art, such as setting an air filtration device, a sealing device, and improving the lubrication system (CN102357536A), but there are still certain defects. At the same time, the related patent CN112483485A discloses an anti-emulsification hydraulic oil tank, which injects dry air into the oil tank, and the dry air will carry the water vapor in the air inside the oil tank away from the oil tank, and isolates the water vapor in the environment from flowing in, achieving the purpose of draining water and preventing water from entering.

[0004] However, the oil tank of the above patent CN112483485A pumps the oil back, and the oil tank can achieve relative sealing. Its moisture mainly comes from the water vapor in the humid air condensing into water and flowing into the oil tank on the side wall of the oil tank. In contrast, the drum gear coupling uses the method of rotating and throwing oil to return the oil, and the coupling shaft is in a high-speed rotating state in the oil tank, accelerating the air flow in the environment, and the thin oil thrown out by rotation has a large contact area with the high-humidity air entering from the radial clearance in the oil tank, resulting in continuous water entering the lubricating oil (thin oil). The moisture content of the lubricating oil remains at a relatively high level and exceeds the set requirements. Coupled with the high temperature of the environment, it accelerates the emulsification and deterioration of the lubricating oil, increasing the difficulty of regular maintenance, and further affecting the normal use of the drum gear coupling. Therefore, there is an urgent need for a new type of isolation device to keep the moisture content of the lubricating oil at a relatively stable level within the maintenance period and reduce the possibility of emulsification and deterioration of the lubricating oil. Summary of the Invention

[0005] 1. Problem to be Solved

[0006] In view of the problem in the prior art that water vapor enters the fuel tank, resulting in the water content of the lubricating oil continuously exceeding the set requirements and causing the lubricating oil to accelerate emulsification and deterioration, the present invention provides a water vapor isolation device for a transmission equipment lubrication system, which can effectively reduce the possibility of water vapor contacting the lubricating oil (thin oil), maintain the water content of the lubricating oil at a relatively stable level, thereby reducing the speed of lubricating oil emulsification and deterioration, and ensuring effective lubrication of the drum gear coupling within the maintenance period.

[0007] 2. Technical Solution

[0008] To solve the above problems, the present invention adopts the following technical solutions.

[0009] In a first aspect of the present invention, a water vapor isolation device for a thin oil tank is provided, which is arranged on the radial clearance between the connecting shaft of the drum gear coupling and the thin oil tank. The above-mentioned radial clearance varies according to the sizes of different drum gear couplings, that is, the device of the present invention can be adaptively designed according to the size of the connecting shaft, but this design is not the core innovation of the present invention and will not be elaborated here. The water vapor isolation device for the thin oil tank of the present invention includes:

[0010] An isolation assembly, which includes an isolation cover. The isolation cover is a hollow cylindrical structure with a conical outer contour and is made of a metal material such as plain carbon steel or stainless steel (with good oil resistance and corrosion resistance). One end of it is bolted to the thin oil tank through a flange for easy disassembly and cleaning (after being used for a period of time, some unavoidable thin oil will adhere to the inside of the isolation cover). The other end of the isolation cover is open, and the diameter of its opening is larger than the maximum outer diameter of the connecting shaft of the drum gear coupling, so that the isolation cover can circumferentially wrap the connecting shaft of the drum gear coupling. A spiral guide groove extending from the driving end to the driven end along the connecting shaft is provided on the inner surface of the isolation cover, and the spiral plate of the spiral guide groove does not contact the circumferential surface of the wrapped connecting shaft.

[0011] To ensure the normal high-speed rotation of the upper and lower connecting shafts, the above-mentioned "non-contact on the surface" means that there is always a gap between the two. The specific description is as follows:

[0012] 1) In the roll-changing state of the present invention, the upper and lower connecting shafts are parallel. Since the thin oil tank is fixed, the central axis of the upper connecting shaft is parallel to the spiral plate of the spiral guide groove. At this time, the gap between the two is the same from the driving end to the driven end;

[0013] 2) In the state of the minimum roll diameter of the present invention, the lower connecting shaft swings upward relative to the axis of the driving end to form an angle, and the upper connecting shaft swings downward relative to the axis of the driving end to form an angle. The central axes of the upper and lower connecting shafts and the spiral plate of the spiral groove are not parallel (the relative position of the spiral plate and the circumferential surface of the connecting shaft changes). At this time, the gap between the two is inconsistent from the driving end to the driven end.

[0014] The connecting shaft of the above-mentioned drum-shaped tooth coupling is cylindrical, having a length (i.e., axial direction) and an outer circumferential surface (i.e., circumferential direction). The device of the present invention can wrap the connecting shaft along the circumferential direction, but it does not necessarily extend entirely in the length direction. In other words, the isolation cover of the present invention has a certain length, and any angle in the circumferential direction has a projection on the connecting shaft.

[0015] A gas supply assembly, which is connected to the inside of the isolation cover through a pipeline and can continuously supply dry compressed gas to the inside of the isolation cover; the dry compressed gas can form a spiral airflow around the circumferential surface of the connecting shaft of the drum-shaped tooth coupling along the spiral groove; by using the continuous dry compressed gas to form an air curtain, the radial gap between the connecting shaft of the drum-shaped tooth coupling and the thin oil tank can be blocked, and the water vapor can be effectively blocked outside the thin oil tank.

[0016] The above-mentioned pipeline can be a metal pipeline, a plastic pipeline, etc. The pipeline can withstand a certain pressure (greater than the pressure of the dry compressed air). A valve convenient for opening and closing can be configured on the pipeline. In order to ensure the continuous operation of the drum-shaped tooth coupling, the dry compressed gas needs to be continuously supplied. However, considering the uncontrollability of the operation of related equipment, the "continuous supply" here can be understood to a certain extent as allowing a supply interruption for a certain period of time, such as within 30 minutes, or within 20 minutes, or within 15 minutes, or within 10 minutes, or even a shorter time.

[0017] During the actual use process, the inventor surprisingly found that through the reasonable design of the spiral groove, the dry compressed gas can be dispersed along the surface of the connecting shaft to both sides, which can not only block the external water vapor, but also part of the dry compressed gas can enter the thin oil tank from the radial gap, effectively reducing the thin oil overflowing along the outside of the thin oil tank due to the surface tension and the thin oil that may splash out.

[0018] In addition, when air enters the thin oil tank body, it needs to enter reversely along the spiral groove, increasing the resistance of entry. Part of the large molecule water vapor is affected by the suction force inside the oil tank in the spiral groove, impacts on the spiral groove and condenses into water droplets inside it, reducing the possibility of water vapor entering the oil tank. Within a certain period of time (such as within 10 - 15 minutes), the problem caused by the failure of the gas supply assembly is effectively solved, providing a time guarantee for timely restoring the function.

[0019] It should be noted that the spiral groove of the present invention is under static conditions. Therefore, parameters such as the pitch and helix angle of the spiral groove do not need to be precisely designed, which is not the core innovation of the present invention and will not be elaborated here. By designing the pitch and helix angle of the spiral groove, it is possible to satisfy the formation of a spiral airflow of the dried compressed gas.

[0020] According to any embodiment of the first aspect of the object of the present invention, the spiral radius of the spiral groove gradually decreases from the active end to the driven end, and the end face A of the spiral plate is in a fixed position relative to the axis of the opening of the dilute oil tank along the spiral direction (towards the driven end). Through the design of this structure, the compressed gas entering has a variable diameter, and the pressure at the inlet is less than the pressure at the outlet, improving the effect of the air curtain seal.

[0021] The end face A of the above-mentioned spiral plate is a non-welded surface and is close to the connecting shaft. The fixed position means that in the direction extending from the active end to the driven end, the distance between the opening axis and the end face A is basically the same (due to machining accuracy issues, complete consistency cannot be achieved). In the present invention, the end face A of the spiral plate is parallel to the axis of the opening of the dilute oil tank along the spiral direction and is on the same straight line as the opening end face B.

[0022] In addition, the spiral radius of the above-mentioned spiral groove gradually decreases from the active end to the driven end. When air enters the dilute oil tank body, it needs to enter in the reverse direction along the spiral groove, further increasing the resistance to entry. Within a certain period of time (for example, within 15 - 20 minutes, or even longer), the problem of the gas supply component losing its function is effectively solved, providing a relatively sufficient time for timely restoration of the function.

[0023] According to any embodiment of the first aspect of the object of the present invention, since the compressed gas only serves to form an air curtain, the type of gas is not specifically limited. The dried compressed gas can be compressed air, compressed nitrogen, compressed hydrogen, compressed helium, compressed oxygen, etc. Preferably, it is compressed air, and an air compressor is configured to provide compressed air for the device. The air compressor can be arranged on one side of the dilute oil tank. The environmental humidity for using lubricating oil generally does not exceed 60%. The above-mentioned "drying" is defined relative to (the environmental humidity of 60% for using lubricating oil). Compressed gas with a humidity lower than 60% is a dry gas. Currently, the dew point of compressed air compressed by ordinary industrial air compressors is usually controlled at about 0°C to -20°C (obtained according to the standard of "GB / T 13277 - 2023"), which is equivalent to a relative humidity of about 20% - 60% at normal temperature, fully meeting the usage requirements.

[0024] Considering the rotation of the coupling shaft and the wind speed at the workshop site being 0.5 - 1 m / s, in order to enable the compressed air to play a better sealing role, the outlet speed of the compressed gas from the isolation cover only needs to be slightly greater than the above wind speed. Thus, the flow rate value is set to 2.4 cubic meters per minute and above, thereby meeting the usage requirements of the present invention.

[0025] According to any implementation of the first aspect of the object of the present invention, an air inlet is provided on the isolation cover near the thin oil tank side and is arranged along the spiral tangent direction of the spiral guide groove. The above "near the thin oil tank side" means that the air inlet for dry compressed gas can be arranged at the starting end of the spiral guide groove or at a certain distance from the thin oil tank.

[0026] The above "arranged along the spiral tangent direction of the spiral guide groove" enables the air inlet to be set slightly inclined or along the tangent direction, as much as possible reducing the running resistance of the dry compressed gas, while ensuring that the dry compressed gas can be sprayed into the spiral guide groove along the tangent direction.

[0027] The spiral direction of the spiral guide groove of the present invention relative to the rotation direction of the coupling shaft can be set to a positive spiral or a negative spiral direction. When the spiral direction is the same as the rotation direction of the coupling shaft, since the tangent direction of the spiral guide groove is the same as the rotation direction, the spiral air flow can relatively quickly form an air curtain on the surface of the coupling shaft; when the spiral direction is inconsistent with the rotation direction of the coupling shaft, although the speed at which the spiral air flow forms an air curtain on the surface of the coupling shaft is reduced, the time of the air curtain on the circumferential surface of the coupling shaft is extended, which does not affect the usage effect.

[0028] Or preferably, the air inlet is located at the starting end of the spiral guide groove, and the dry compressed air can be sprayed into the spiral guide groove along the tangent direction, forming an air curtain with a relatively long distance in the length direction of the coupling shaft, effectively improving the sealing effect.

[0029] According to any implementation of the first aspect of the object of the present invention, if the starting end of the spiral guide groove is arranged close to the edge of the thin oil tank, due to the surface tension between the thin oil and the object surface, the thin oil will move upward along the root of the spiral guide groove and thus enter the spiral guide groove. There is a distance H between the starting end of the spiral guide groove and the thin oil tank, and the value of H is 3 - 10 mm, preferably 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm. Considering the surface tension between the thin oil and the object surface, the adverse effects brought by the surface tension at the starting end of the spiral guide groove are reduced as much as possible.

[0030] According to any implementation of the first aspect of the object of the present invention, a number of wind direction adjusting blocks are arranged in the spiral guide groove. The wind direction adjusting blocks have arc-shaped adjusting surfaces. The above wind direction adjusting blocks are arranged at intervals in the spiral guide groove in turn, and the arc-shaped adjusting surfaces of the wind direction adjusting blocks face the circumferential surface of the coupling shaft.

[0031] According to any embodiment of the first aspect of the object of the present invention, the wind direction adjusting block can be an arc plate, and the highest point of its arc contour is located at 0.3 - 0.5 times the height of the spiral plate at the setting position, preferably 0.3 times, 0.35 times, 0.4 times, 0.45 times, 0.5 times; its width is slightly smaller than the width of the spiral guide groove.

[0032] Or the wind direction adjusting block can be an arc protrusion, and the highest point of its arc contour is located at 0.3 - 0.5 times the height of the spiral plate, preferably 0.3 times, 0.35 times, 0.4 times, 0.45 times, 0.5 times; its width is slightly smaller than the width of the spiral guide groove.

[0033] It should be noted that the wind direction adjusting block of the present invention does not need to be precisely designed and is not the core innovation of the present invention, so it will not be elaborated here. By designing the installation position of the wind direction adjusting block and its own size, it can meet the rough regulation of the wind direction and wind speed of the dry compressed gas.

[0034] According to any embodiment of the first aspect of the object of the present invention, a wind baffle is provided at the open end of the isolation cover. A gap is formed between the wind baffle and the circumferential surface of the connecting shaft. The dry compressed gas sprays out from this gap to form an air curtain, further blocking the entry of external water vapor into the interior of the isolation cover. The wind baffle here can slow down the spraying speed of the dry compressed gas and reduce the possibility of environmental dust to a certain extent.

[0035] The above-mentioned wind baffle is an annular plate. The central hole of the annular plate is for the connecting shaft to pass through and for the need of the swing angle. The annular plate is welded to the inner wall of the isolation cover without any gaps to prevent the dry compressed gas from overflowing from the gaps.

[0036] The second aspect of the present invention provides a lubrication system, which has the water vapor isolation device for the thin oil tank described in the first aspect. The compressed gas forms a spiral airflow around the surface of the drum-shaped tooth coupling, and uses the continuous pressure of the dry compressed gas to block the water vapor outside the thin oil tank.

[0037] The third aspect of the present invention provides a drum-shaped tooth coupling, which has the lubrication system described in the second aspect. The water content of the thin oil supplied by the thin oil tank is maintained at a relatively stable level, ensuring the full lubrication of the drum-shaped tooth coupling.

[0038] 3. Beneficial effects

[0039] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0040] (1) By arranging an isolation device between the thin oil tank and the drum gear coupling, the present invention uses an air curtain formed by dry compressed gas to block water vapor outside the thin oil tank, effectively preventing water vapor from entering the tank and contacting the thin oil, resulting in the emulsification and deterioration of the lubricating oil. This ensures effective lubrication of the drum gear coupling and reduces the economic losses caused by the irregular replacement of the lubricating oil.

[0041] (2) By utilizing the power of dry compressed gas and the design of the isolation cover, the device of the present invention solves the problem that a fixed seal cannot be set between the thin oil tank and the drum gear coupling when the drum gear coupling changes its working angle (swing angle) during operation.

[0042] (3) The isolation cover of the present invention does not contact the drum gear coupling, and its inner surface is designed with spiral guide grooves. The dry compressed gas forms a spiral airflow around the surface of the drum gear coupling, and the continuous pressure of the dry compressed gas blocks the water vapor outside the tank, effectively isolating the water vapor from entering.

[0043] (4) The device of the present invention ensures effective lubrication of the drum gear coupling, avoids abnormal wear of the tooth surface, and extends the service life.

[0044] (5) The device of the present invention has a simple structure, is convenient to maintain, does not require large-scale modification of the existing system, and has good practicability and economy. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] The technical solution of the present invention will be further described in detail below in conjunction with the drawings and embodiments. However, it should be noted that these drawings are only designed for explanatory purposes and therefore do not limit the scope of the present invention. In addition, unless otherwise specified, these drawings are only intended to conceptually illustrate the structural configurations described herein and are not necessarily drawn to scale.

[0046] Figure 1 is a schematic structural diagram of the prior art of the present invention;

[0047] Figure 2 is a schematic structural diagram of the water vapor isolation device in the roll-changing state of the present invention;

[0048] Figure 3 is a schematic structural diagram of the water vapor isolation device in the state of the minimum roll diameter of the present invention;

[0049] Figure 4 is a schematic rendering structural diagram of the isolation component of the present invention;

[0050] Figure 5 is a schematic front view structural diagram of the isolation component of the present invention;

[0051] Figure 6 is a partial cross-sectional view of the isolation component of the present invention;

[0052] Figure 7 Schematic diagram of the position structure of the isolation component and the spindle of the present invention;

[0053] Figure 8 Another schematic diagram of the isolation component of the present invention;

[0054] Figure 9 Overall flow field simulation analysis diagram of the device of the present invention;

[0055] Figure 10 Flow field simulation analysis diagram of 4 cross-section points of the device of the present invention.

[0056] In the figure:

[0057] 100. Isolation component; 110. Isolation cover; 111. Spiral guide groove; 112. Air inlet; 113. Spiral plate; 114. End face A; 115. Starting end; 116. Tangent line; 120. Wind direction adjusting block; 121. Adjusting surface; 130. Windshield;

[0058] 200. Gas supply component; 210. Pipeline; 220. Air compressor;

[0059] 300. Dilute oil tank; 310. Radial clearance; 320. Opening; 321. Axis; 322. End face B;

[0060] 400. Spindle. Detailed implementation manners

[0061] The following detailed description of the present invention and the exemplary embodiments can be better understood in conjunction with the accompanying drawings, in which the elements and features of the present invention are identified by reference numerals.

[0062] The following detailed description of the exemplary embodiments of the present invention refers to the accompanying drawings, which form a part of the description, and in which exemplary embodiments in which the present invention can be implemented are shown by way of example. It should be understood that the following text is only used to describe one or several specific implementation manners of the present invention, and does not strictly limit the scope of protection specifically claimed by the present invention. The structures, ratios, sizes, etc. shown in the drawings of this specification are only used to cooperate with the content disclosed in the specification for those skilled in this technology to understand and read, and are not used to limit the limiting conditions under which the present invention can be implemented. Therefore, they do not have a technical essence. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effects that the present invention can produce and the purposes that can be achieved, should still fall within the scope that can be covered by the technical content disclosed by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and the like cited in this specification are only for the convenience of clear narration, and are not used to limit the scope that can be implemented. The change or adjustment of their relative relationships, without substantial change in the technical content, should also be regarded as the scope in which the present invention can be implemented.

[0063] As Figures 2 to 9 shown, the water vapor isolation device of the thin oil tank in this embodiment is arranged on the radial clearance between the connecting shaft of the drum gear coupling and the thin oil tank. The device includes an isolation component and a gas supply component. The isolation component is arranged outside the thin oil tank and can surround the connecting shaft, and the gas supply component is connected to the isolation component.

[0064] As Figure 2 and Figure 3 shown, considering that the drum gear coupling uses the oil slinger and the thin oil tank for oil return, in order to avoid the isolation component adhering to the lubricating oil, the isolation component is arranged outside the thin oil tank, that is, towards the driven end.

[0065] In some embodiments given by the present invention, in Figure 2 , Figure 4 and Figure 5 , the isolation component includes an isolation cover. The isolation cover is a hollow cylindrical structure with a conical outer contour (the outer diameter near the thin oil tank is larger), and is made of a metal material such as plain carbon steel. One end of it is bolted to the thin oil tank through a flange for easy disassembly and cleaning. The other end of the isolation cover is open, and the opening diameter is larger than the maximum outer diameter of the connecting shaft of the drum gear coupling, so that the isolation cover can wrap the connecting shaft of the drum gear coupling circumferentially. A spiral guide groove extending from the driving end to the driven end along the connecting shaft is arranged on the inner surface of the isolation cover. The above spiral guide groove is formed by a spiral plate surrounding the central axis of the connecting shaft, and the spiral plate of the spiral guide groove does not contact the circumferential surface of the wrapped connecting shaft.

[0066] In order to ensure the normal high-speed rotation of the upper and lower connecting shafts, the above "non-contact on the surface" means that there is always a gap between the two.

[0067] As Figure 2 and Figure 3 shown, the specific description is as follows:

[0068] 1) In the roll changing state of the present invention, the upper and lower connecting shafts are parallel. Since the thin oil tank is fixed, the upper connecting shaft is parallel to the central axis of the spiral plate. At this time, the gap between the two is the same from the driving end to the driven end;

[0069] 2) In the state of the minimum roll diameter of the present invention, the lower connecting shaft is fixed, and the upper connecting shaft has a swing angle relative to the lower connecting shaft. The upper connecting shaft is not parallel to the central axis of the spiral plate (the relative position between the spiral guide groove and the circumferential surface of the upper connecting shaft changes). At this time, the gap between the two is inconsistent from the driving end to the driven end.

[0070] Combined with Figure 9As shown, the gas supply component is connected to the inside of the isolation cover through a pipeline and can continuously supply dry compressed gas to the inside of the isolation cover; the dry compressed gas can form a spiral airflow around the surface of the shaft of the drum tooth coupling along the spiral guide groove; a gas curtain is formed by the continuous dry compressed gas to block the radial gap between the shaft of the drum tooth coupling and the thin oil tank, and block the water vapor outside the thin oil tank.

[0071] During the actual use process, the inventor surprisingly found that the spiral guide groove can make the dry compressed gas disperse along the surface of the shaft to both sides ( Figure 2 the direction shown by the arrow in Figure 9 and the flow field shown), which can not only block the water vapor, but also part of the dry compressed gas can enter the thin oil tank from the radial gap, effectively reducing the thin oil overflowing along the outside of the thin oil tank due to surface tension (or capillary action), and the thin oil that may splash out.

[0072] In addition, during the production process, due to the failure shutdown of the air compressor that provides dry compressed gas, after timely discovery, a spare air compressor is used for air supply. The reaction time is about 10 minutes. The moisture content of the lubricating oil in the thin oil tank is detected. Compared with the moisture content when the device of the present invention is operating normally, the moisture in the thin oil is detected by a Karl Fischer moisture meter, and it increases by about 1000 ppm. This increase in moisture hardly affects the moisture content of the lubricating oil.

[0073] The reason for the analysis is that when air enters the thin oil tank body, it needs to enter reversely along the spiral guide groove, increasing the entry resistance. Part of the large molecule water vapor is affected by the suction force inside the oil tank in the spiral guide groove, impacts on the spiral guide groove and condenses into water droplets inside it, reducing the possibility of water vapor entering the oil tank. Within a certain period of time (for example, within 10 - 15 minutes), the problem caused by the failure of the gas supply component is effectively solved.

[0074] Furthermore, as Figure 5 shown, the spiral radius of the spiral guide groove gradually decreases from the driving end to the driven end, and the end face A of the spiral plate is in a relatively fixed position along the spiral direction with respect to the axis of the opening of the thin oil tank. Through the design of this structure, the incoming compressed gas has a variable diameter structure, and the pressure at the inlet of the compressed gas is less than the pressure at the outlet, improving the sealing effect of the gas curtain.

[0075] The end face A of the above-mentioned spiral plate is a non-welded surface and is close to the shaft. The position being unchanged means that in the direction extending from the driving end to the driven end, the distance between the opening axis and the end face A is basically the same (due to machining accuracy issues, it cannot be completely consistent). In the present invention, the end face A of the spiral plate is parallel to the opening axis of the thin oil tank along the spiral direction and is on the same straight line as the opening end face B.

[0076] In addition, the spiral guide groove mentioned above has a gradually decreasing spiral radius from the active end to the driven end (using a partition cover with a conical outer contour). When air enters the dilute oil tank body, it needs to enter along the spiral guide groove in the reverse direction, further increasing the entry resistance. Within a certain period of time (for example, within 15 - 20 minutes), the problem caused by the failure of the gas supply component is effectively solved, providing time for timely function restoration.

[0077] The above-mentioned "gradually decreasing spiral radius" is based on the premise that the distance between the end face A of the spiral plate and the opening axis is basically the same, and the height of the spiral plate gradually decreases. In Figure 5 it, the height of the spiral plate at the starting end a is 68 mm; the height at the middle part b is 56 mm, the height at the middle part c is 44 mm, and the height of the spiral plate at the air outlet end is 42 mm.

[0078] In this embodiment, since the dry compressed gas only serves to form an air curtain, there is no specific limitation on the type of gas. The dry compressed gas can be compressed air, compressed nitrogen, compressed hydrogen, compressed helium, compressed oxygen, etc. Preferably, it is compressed air, and an air compressor is configured to provide compressed air for the device. The air compressor can be arranged on one side of the dilute oil tank. Under room temperature conditions, the finished gas temperature of the air compressor is 35 °C, and the pressure dew point of the compressed air of the air compressor is -10 °C, and the relative humidity is about 24.6%, fully meeting the usage requirements.

[0079] Considering the rotation of the coupling shaft and the wind speed on the workshop site being 0.5 - 1 m / s, in order to enable the compressed air to play a better sealing role, the outlet speed of the compressed gas from the partition cover is slightly greater than the above-mentioned wind speed. Thus, the flow rate value is set to 2.4 cubic meters per minute and above, so it meets the usage requirements of the present invention.

[0080] In addition, the compressed air can also be produced in the following way. For example, a gas pressure source, a first air filter, an air dryer, a gas storage tank, a gas switch valve, a pressure reducing valve, a pressure gauge, and a second air filter are connected in sequence. The obtained dry compressed air is connected to the air inlet opened on the dilute oil tank through a pipeline.

[0081] As Figure 4 and Figure 5 shown, an air inlet is provided on the partition cover close to the dilute oil tank side and is arranged along the spiral tangent direction of the spiral guide groove. The above-mentioned "close to the dilute oil tank side" means that the air inlet of the dry compressed gas can be arranged at the starting end of the spiral guide groove or at a certain distance from the dilute oil tank.

[0082] In Figure 5 and Figure 8In the above, "arranged along the spiral tangent direction of the spiral guide groove" enables the air inlet to be slightly inclined or arranged along the tangent direction, minimizing the running resistance of the compressed gas as much as possible while ensuring that the dried compressed gas can be sprayed into the spiral guide groove along the tangent direction.

[0083] Combined with Figure 8 As shown, the spiral direction of the spiral guide groove of the present invention relative to the rotation direction of the connecting shaft can be set to a positive spiral or a negative spiral direction. When the spiral direction is the same as the rotation direction of the connecting shaft, since the tangent direction of the spiral guide groove is the same as the rotation direction, the spiral air flow can form an air curtain on the surface of the connecting shaft relatively quickly; when the spiral direction is inconsistent with the rotation direction of the connecting shaft, although the speed at which the spiral air flow forms an air curtain on the surface of the connecting shaft is reduced, the time of the air curtain on the circumferential surface of the connecting shaft is extended, which does not affect the use effect.

[0084] As Figure 7 shown, the air inlet is located at the starting end of the spiral guide groove, and the dried compressed air can be sprayed into the spiral guide groove along the tangent direction, forming an air curtain over a relatively long distance in the length direction of the connecting shaft, effectively improving the sealing effect. If the starting end of the spiral guide groove is arranged close to the edge of the thin oil tank, due to the surface tension between the thin oil and the object surface, the thin oil will move upward along the root of the spiral guide groove and thus enter the spiral guide groove. There is a distance H between the starting end of the spiral guide groove and the thin oil tank, and the value of H is 8 mm. Considering the surface tension between the thin oil and the object surface, the adverse effects brought by the surface tension on the starting end of the spiral guide groove are minimized as much as possible.

[0085] As Figure 8 shown, in this embodiment, the wind direction adjusting block can be an arc plate, and the highest point of its arc contour is located at 0.4 times the height of the spiral plate at the setting position (D in the figure is 0.6 times the height of the spiral plate), and its width is slightly smaller than the width of the spiral guide groove.

[0086] It should be noted that the wind direction adjusting block of the present invention does not require precise design and is not the core innovation of the present invention, so it will not be elaborated here. By designing the setting position of the wind direction adjusting block and its own dimensions, it can meet the rough control of the wind direction and wind speed of the dried compressed gas.

[0087] Furthermore, as Figure 6 and Figure 8 shown, a wind baffle is provided at the open end of the isolation cover. A gap is formed between the wind baffle and the circumferential surface of the connecting shaft, and the dried compressed gas sprays out from this gap to form an air curtain, further blocking the entry of external water vapor into the interior of the isolation cover. The wind baffle here can delay the spraying speed of the dried compressed gas and reduce the possibility of environmental dust raising to a certain extent.

[0088] The wind shield is a circular plate, the center hole of which is for the connecting shaft to pass through and for the need of swing angle. The circular plate is welded to the inner wall of the isolation cover without any gap, so as to prevent dry compressed gas from overflowing from the gap.

[0089] The second aspect of the present invention provides a lubrication system having the above-mentioned water vapor isolation device for the thin oil box, wherein the compressed gas forms an airflow around the spiral on the surface of the drum gear coupling, such as Figure 9 and Figure 10 As shown, continuous dry gas pressure is used to keep water vapor out of the lean oil tank.

[0090] like Figure 2 and Figure 3 As shown, the third aspect of the present invention provides a drum gear coupling having the lubrication system, and the drum gear coupling can run smoothly in the roller changing state and the minimum roller diameter state, ensuring that the water content of the lubricating oil does not exceed the standard as much as possible.

[0091] Too high water content in lubricating oil will have an adverse effect on the lubrication effect of mechanical equipment, so it is very important to control the water content in lubricating oil. According to the national standard GB / T 511 "Determination of water content in lubricating oil", the water content in lubricating oil should be controlled below 0.05%, which is applicable to various lubricating oils, including grease, hydraulic oil, gear oil, machine tool oil, etc. However, due to the influence of the use environment, the water content of the lubricating oil of the present invention is generally high. The water content in the thin oil is detected by a Karl Fischer moisture meter, and the following table is obtained:

[0092]

[0093] It should be noted that the oil tank of patent CN112483485A returns oil through a pump, and then regularly discharges the air inside the oil tank through a breather, and the air enters the oil tank in a non-continuous state. When the drum gear coupling is in working condition, the speed of its connecting shaft is as high as 1000r / min, and the connecting shaft and the oil tank are in a non-static state. The rotation of the connecting shaft generates air disturbance, which accelerates the possibility of water-containing air entering the oil tank, causing water vapor to continuously enter the lubricating oil (thin oil), increasing the possibility of water vapor contacting with the thrown-out thin oil, and maintaining the moisture content at a relatively high level (the actual moisture content after 6 months is 0.44%) and exceeds the set requirements (according to the provisions of the "Test Method for Moisture Content of Lubricating Oil" (GB / T 260-2017), the moisture content after 6 months should be controlled within 0.2%), which accelerates the emulsification and deterioration of the lubricating oil.

[0094] Compared with the present invention, the measured average moisture content after 6 months is 0.07%. According to the provisions of the "Inspection Method for Moisture Content of Lubricating Oil" (GB / T 260-2017), the moisture content of the device of the present invention after using [X] months can be controlled within 0.2%, meeting the practical safety requirements.

[0095] The above has schematically described the present invention and its implementation manners. This description is not restrictive. What is shown in the drawings is only one of the implementation manners of the present invention, and the actual structure is not limited thereto. Therefore, if those of ordinary skill in the art are inspired by it and, without departing from the gist of the present invention, design similar structural manners and embodiments to this technical solution without creative efforts, they shall fall within the protection scope of the present invention.

Claims

1. A water vapor isolation device for a thin oil tank (300), which is arranged on the radial clearance (310) between the drum-shaped tooth coupling shaft (400) and the thin oil tank (300), and is characterized in that, Comprising: An isolation component (100), which includes an isolation cover (110). The isolation cover (110) is a hollow cylindrical structure. One end of it is connected to the thin oil tank (300), and the other end is open. The diameter of its open port is larger than the maximum outer diameter of the connecting shaft (400) of the drum tooth coupling, so that the isolation cover (110) can circumferentially wrap the connecting shaft (400) of the drum tooth coupling. The inner surface of the isolation cover (110) is provided with a spiral guide groove (111) extending along the connecting shaft (400) from the driving end to the driven end. The spiral plate (113) of the spiral guide groove (111) does not contact the circumferential surface of the wrapped connecting shaft (400). A gas supply component (200), which is connected to the inside of the isolation cover (110) through a pipeline (210) and can continuously supply dry compressed gas to the inside of the isolation cover (110). The dry compressed gas can form a surrounding spiral air flow along the spiral guide groove (111) on the circumferential surface of the connecting shaft (400) of the drum tooth coupling, so as to block the radial gap (310) between the connecting shaft (400) of the drum tooth coupling and the thin oil tank (300).

2. The water vapor isolation device for the dilute oil tank (300) according to claim 1, characterized in that, The spiral radius of the spiral guide groove (111) gradually decreases from the driving end to the driven end, and the end face A (114) of the spiral plate (113) is in a fixed position relative to the opening axis (321) of the thin oil tank (300) along the spiral direction.

3. The water vapor isolation device for the dilute oil tank (300) according to claim 1, characterized in that, The dry compressed gas is compressed air, compressed nitrogen, compressed hydrogen, compressed helium or compressed oxygen.

4. The water vapor isolation device for the dilute oil tank (300) according to any one of claims 1-3, characterized in that, An air inlet (112) is provided on the side of the isolation cover (110) close to the thin oil tank (300), and is arranged along the spiral tangent direction of the spiral guide groove (111); or the air inlet (112) is located at the starting end of the spiral guide groove (111).

5. The water vapor isolation device for the dilute oil tank (300) according to claim 4, characterized in that, There is a distance H between the starting end of the spiral guide groove (111) and the thin oil tank (300), and the value of H is 3 - 10 mm.

6. The water vapor isolation device for the dilute oil tank (300) according to claim 5, characterized in that, A number of wind direction adjusting blocks (120) are arranged in the spiral guide groove (111), and the wind direction adjusting blocks (120) have arc-shaped adjusting surfaces (121).

7. The water vapor isolation device for the dilute oil tank (300) according to claim 6, characterized in that, The wind direction adjusting block (120) is an arc plate, and the highest point of its arc contour is located at 0.3 - 0.5 times the height of the spiral plate (113) at the installation position; its width is slightly smaller than the width of the spiral guide groove (111).

8. The water vapor isolation device for the dilute oil tank (300) according to claim 7, characterized in that, A wind shield (130) is arranged at the open end of the isolation cover (110). A gap is formed between the wind shield (130) and the open end of the isolation cover (110), and the dry compressed gas sprays out from this gap to form an air curtain.

9. A lubrication system, characterized in that, A water vapor isolation device for the thin oil tank (300) according to any one of claims 1 - 8.

10. A drum-shaped tooth coupling, characterized in that, A lubrication system according to claim 9.

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