A mixer reducer protection device
By designing the structure of the windward and exhaust ducts, the corrosion of the mixing reducer by alkaline vapor and the obstruction of vision were solved, thus achieving stable operation and safe inspection of the equipment.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- YUNNAN WENSHAN ALUMINUM CO LTD
- Filing Date
- 2025-08-11
- Publication Date
- 2026-06-05
Smart Images
Figure CN224326659U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of mixers, and more particularly to a protective device for a mixer speed reducer. Background Technology
[0002] In alumina production, seed crystal decomposition is a key process. The mechanical agitation equipment within the decomposition tank is crucial for ensuring smooth production. Its core function is to maintain the aluminum hydroxide seed crystals in a uniform suspension and promote thorough mixing of the sodium aluminate solution, thereby facilitating the efficient decomposition reaction of the sodium aluminate solution. To obtain aluminum hydroxide products with coarser particle size and higher quality, the first tank of seed crystal decomposition is typically controlled at a relatively high temperature (65-70℃). This high-temperature operating environment is typical for the operation of such agitation equipment.
[0003] However, since the overall structure of the decomposition tank is mostly enclosed, there are only gaps at the points where the feed bucket and the stirring shaft protrude from the top of the tank. When the ambient temperature is low, the high-temperature slurry in the first tank releases a large amount of heat, forming and releasing high-concentration alkaline vapors. These alkaline vapors diffuse upwards, affecting the stirring reducer and its drive motor located at the top of the tank. This continuous alkaline vapor intrusion presents two problems: First, the alkaline vapors condense, crystallize, and scale on the reducer casing, heat dissipation surfaces, and motor casing, severely hindering the normal heat dissipation of the equipment (especially the motor), causing abnormally high motor operating temperatures, significantly shortening its service life, and threatening the long-term stable operation of the decomposition tank stirring system; second, the diffused alkaline vapors form a "fog" at the top of the tank, severely obscuring the vision of on-site operators and maintenance personnel, making daily inspections and patrols of the operating status of critical equipment (such as reducers and motors) difficult, easily overlooking potential faults or safety hazards, posing a significant threat to production safety. In existing technologies, the stirring reducer and its motor are usually directly exposed to this harsh alkaline vapor environment, lacking effective targeted protective measures. Utility Model Content
[0004] In order to eliminate safety hazards in the inspection channel, this application provides a protection device for a mixer reducer.
[0005] This application provides a protection device for a mixer reducer, which adopts the following technical solution:
[0006] A protective device for a mixing reducer includes a windward slot disposed on one side of the reducer and an exhaust slot disposed on the reducer on the opposite side of the windward slot, wherein the opening orientation of the windward slot is set according to the wind direction.
[0007] The windward slot is connected to the surface of the first decomposition slot, and the exhaust slot is connected to the surface of the first decomposition slot.
[0008] By adopting the above technical solution, since the opening direction of the windward sluice is set according to the actual wind direction, the structure of the windward sluice communicating with the surface of the first decomposition tank can efficiently guide the natural wind to flow into the gap area between the reducer and the first decomposition tank, forming a stable inlet airflow. At the same time, the exhaust sluice is set on the other side of the reducer and communicates with the surface of the first decomposition tank, together with the windward sluice, to form an airflow path from the windward sluice to the natural wind, flowing through the gap area to the exhaust sluice for discharge. During this process, the natural wind will drive the alkaline vapor in the gap towards the exhaust sluice, avoiding the alkaline vapor from vertically accumulating upward due to density differences or disordered diffusion, thereby reducing the direct contact corrosion of alkaline vapor on precision components such as the reducer housing and stirring motor, and reducing the risk of equipment short circuit or lubrication failure. In addition, the directional discharge effect of the exhaust sluice can create a slightly negative pressure environment in the gap area, promoting the continuous flow of alkaline vapor to the exhaust sluice and its eventual discharge.
[0009] Preferably, the side of the windward groove facing the wind is the first air inlet, and the size of the windward groove gradually increases from the first decomposition groove to the first air inlet.
[0010] By adopting the above technical solution, the cross-sectional area of the windward trough gradually expands from the side of the first decomposition trough towards the first air inlet facing the wind. The opening range at the first air inlet is wider, which can effectively cover a larger area of natural wind flow. Even if there is a slight deviation in wind direction, the wide opening design can maximize the reception of natural wind and avoid air volume loss or collection blind spots caused by the air inlet being too narrow. At the same time, as the size of the windward trough gradually decreases towards the direction of the first decomposition trough, according to the principle of fluid dynamics continuity, the airflow will be gradually accelerated during the flow process. This allows the natural wind entering the windward trough to push the alkaline vapor in the gap towards the exhaust trough, avoiding the alkaline vapor from stagnating and accumulating due to insufficient flow velocity.
[0011] Preferably, the opening of the exhaust duct facing the windward duct is a second air inlet, the width of the first air inlet is W1, the width of the second air inlet is W2, and W1 ≥ 1.5W2.
[0012] By adopting the above technical solution, the windward sluice, as the inlet of natural wind, has a larger first inlet width W1, which can effectively expand the range of natural wind reception and avoid air volume loss or collection blind spots caused by the narrow inlet, thereby providing more sufficient airflow power for the gap area. The exhaust sluice, as the outlet of alkaline vapor, has a smaller second inlet width W2. According to the principle of fluid mechanics continuity, when natural wind carries alkaline vapor from the wider windward sluice and flows through the gap area to the narrower exhaust sluice, the airflow velocity will increase due to the reduction of the flow area. The high-speed airflow can drive the alkaline vapor toward the exhaust sluice opening, avoiding the alkaline vapor from accumulating on the surface of the reducer or the decomposition tank due to insufficient flow velocity.
[0013] Preferably, the inner wall of the windward trough is provided with a first guide plate arranged along its length direction. The inclination angle of the first guide plate is 30° to 60°. The first guide plate guides the natural airflow to the gap between the decomposition tank and the reducer.
[0014] By adopting the above technical solution, the natural wind may be dispersed in direction when entering the windward sluice. The tilt angle design of the first guide plate can effectively correct the airflow direction. The tilt angle can concentrate and guide the natural wind to the gap area between the decomposition tank and the reducer. The guide plate is arranged along the length of the windward sluice to ensure that the airflow is consistent in direction throughout the entire introduction path, and avoid airflow turbulence or dispersion caused by the lack of guidance in local areas.
[0015] Preferably, the inner wall of the exhaust duct is provided with a second guide plate arranged along its length, and the extension direction of the second guide plate forms an angle of 15°-60° with the airflow.
[0016] By adopting the above technical solution, after the natural wind is introduced into the gap area through the windward slot, the flow direction may be locally disturbed due to obstacles in the gap or fluctuations in the external wind field. The tilt angle design of the second guide plate can effectively correct the airflow path and redirect the turbulent airflow into a concentrated flow along the length of the exhaust slot.
[0017] Preferably, it also includes a protective cover that covers the gap area between the reducer and the surface of the first decomposition tank.
[0018] By adopting the above technical solution, the reducer and the decomposition tank may experience slight displacement due to vibration or thermal expansion and contraction during operation. The gap area is prone to become a weak point for alkaline vapor leakage. At the same time, dust, rainwater and other debris in the external environment may also enter through the gap, causing blockage of the airflow channel or corrosion of components. The covering structure of the protective cover can directly block the connection between the gap and the external environment, forming a closed or semi-closed protective space. On the one hand, it can effectively prevent alkaline vapor from overflowing disorderly from the gap to the inspection channel or surrounding area, avoiding corrosion of the equipment shell caused by the diffusion of alkaline vapor. On the other hand, it can block external dust, rainwater and other debris from entering the gap, avoiding blockage of the exhaust duct or windward duct inlet caused by the accumulation of debris.
[0019] Preferably, the connection between the protective cover and the surface of the first decomposition tank is sealed with a sealing element, wherein the sealing element is a sealing flange.
[0020] By adopting the above technical solution, the sealing flange is usually composed of two flanges with bolt holes and a sealing gasket in the middle. After the bolts are tightened evenly, the sealing gasket can fully fill the tiny gap at the connection between the protective cover and the decomposition tank, forming a continuous sealing interface, thereby effectively preventing the leakage of alkaline vapor from the connection to the external inspection channel or the surrounding environment.
[0021] Preferably, the sealing flange has a liquid collection groove, which is connected to the decomposition tank.
[0022] By adopting the above technical solution, after the alkaline vapor is introduced into the gap area through the windward slot, some of the alkaline vapor will condense due to the cooling of the natural wind to form alkaline liquid. This liquid is easy to adhere to the surface of the sealing flange or the connection gap. The recessed structure of the liquid collection groove can accurately capture this condensate and guide the liquid to flow along the tank body towards the decomposition first tank. The opening connected to the decomposition first tank will directly introduce the collected liquid into the interior of the decomposition first tank, avoiding the accumulation of condensate at the flange connection to form droplets or liquid layer.
[0023] Preferably, the side of the exhaust duct away from the reducer is the air outlet, and the height of the air outlet is higher than the height of the top surface of the first decomposition trough.
[0024] By adopting the above technical solution, when natural wind or ducted exhaust carries alkaline vapor into the exhaust trough, it will flow along the trough towards the air outlet. The higher air outlet position provides a more direct upward path for the alkaline vapor, avoiding the alkaline vapor from stagnating in the exhaust trough due to the air outlet being too low.
[0025] Preferably, a metal filter screen is provided at the first air inlet.
[0026] By adopting the above technical solution, natural wind may carry dust, leaves, insects or other debris during its entry into the windward slot. If these debris directly enter the interior of the windward slot, they are likely to adhere to the surface of the guide plate or block the gaps between the guide plates, resulting in increased airflow resistance, reduced guiding efficiency, and even local airflow turbulence caused by debris accumulation, affecting the directional discharge of alkaline vapor. The mesh structure of the metal filter can accurately intercept such impurities, ensuring that the debris is blocked on the outside of the filter, while allowing natural wind to pass through smoothly.
[0027] In summary, this application includes at least one of the following beneficial technical effects:
[0028] 1. Because the opening of the windward sluice is set according to the actual wind direction, the structure of the windward sluice communicating with the surface of the first decomposition tank can efficiently guide the natural wind to flow into the gap area between the reducer and the first decomposition tank, forming a stable inlet airflow. At the same time, the exhaust sluice is set on the other side of the reducer and communicates with the surface of the first decomposition tank. Together with the windward sluice, it forms an airflow path from the windward sluice to the natural wind, which flows through the gap area and is discharged through the exhaust sluice. During this process, the natural wind will drive the alkaline vapor in the gap towards the exhaust sluice, avoiding the alkaline vapor from accumulating vertically upward due to density differences or disordered diffusion. This reduces the direct contact corrosion of alkaline vapor on precision components such as the reducer housing and stirring motor, and reduces the risk of equipment short circuits or lubrication failures. In addition, the directional discharge of the exhaust sluice can create a slightly negative pressure environment in the gap area, promoting the continuous flow of alkaline vapor to the exhaust sluice and its eventual discharge.
[0029] 2. As the cross-sectional area of the windward sluice gradually expands from the decomposition first sluice to the first air inlet facing the wind, the opening range at the first air inlet is wider, which can effectively cover a larger area of natural wind flow. Even if there is a slight deviation in wind direction, the wide opening design can maximize the reception of natural wind and avoid air volume loss or collection blind spots caused by the air inlet being too narrow. At the same time, as the size of the windward sluice gradually decreases towards the decomposition first sluice, according to the principle of fluid dynamics continuity, the airflow will be gradually accelerated during the flow process. This allows the natural wind entering the windward sluice to push the alkaline vapor in the gap towards the exhaust sluice, avoiding the alkaline vapor from stagnating and accumulating due to insufficient flow velocity. Attached Figure Description
[0030] Figure 1 This is a schematic diagram of the structure of the stirring reducer protection device in the embodiment of this application without a metal filter screen;
[0031] Figure 2 This is a schematic diagram illustrating the protective device used when installing a metal filter screen;
[0032] Figure 3 This is a structural diagram showing the front structure of the protective device.
[0033] Explanation of reference numerals in the attached diagram: 1. Reducer; 2. First disassembly trough; 3. Windward trough; 31. First air inlet; 4. Exhaust trough; 5. Metal filter screen. Detailed Implementation
[0034] The following is in conjunction with the appendix Figure 1-3 This application will be described in further detail.
[0035] This application discloses a protection device for a mixer speed reducer. (Refer to...) Figure 1 and Figure 2The protection device for the mixing reducer includes a windward slot 3 on one side of the reducer 1 and an exhaust slot 4 on the reducer 1 opposite to the windward slot 3. The opening of the windward slot 3 is set according to the wind direction. The windward slot 3 is connected to the surface of the decomposition first slot 2, and the exhaust slot 4 is connected to the surface of the decomposition first slot 2.
[0036] Since the opening direction of the windward sluice 3 is set according to the actual wind direction, the structure of the windward sluice 3 communicating with the surface of the first decomposition sluice 2 can efficiently guide the natural wind to flow into the gap area between the reducer 1 and the first decomposition sluice 2, forming a stable inlet airflow. At the same time, the exhaust sluice 4 is set on the other side of the reducer 1 and communicates with the surface of the first decomposition sluice 2. Together with the windward sluice 3, it forms an airflow path from the windward sluice 3 to the natural wind, which flows through the gap area and is discharged through the exhaust sluice 4. During this process, the natural wind will drive the alkaline vapor in the gap to move towards the exhaust sluice 4, avoiding the alkaline vapor from accumulating vertically upward due to density differences or disordered diffusion. This reduces the direct contact corrosion of alkaline vapor on the reducer 1 housing, stirring motor and other precision components, and reduces the risk of equipment short circuit or lubrication failure. In addition, the directional discharge function of the exhaust sluice 4 can create a slightly negative pressure environment in the gap area, promoting the continuous flow of alkaline vapor to the exhaust sluice 4 and its eventual discharge.
[0037] In an optional embodiment, the windward side of the windward slot 3 is the first air inlet 31, and the size of the windward slot 3 gradually increases from the first slot 2 to the first air inlet 31. The opening of the exhaust slot 4 facing the windward slot 3 is the second air inlet, the width of the first air inlet 31 is W1, the width of the second air inlet is W2, and W1 ≥ 1.5W2. As the cross-sectional area of the windward trough 3 gradually expands from the decomposition first trough 2 towards the first air inlet 31 facing the wind, the opening range at the first air inlet 31 is wider, which can effectively cover a larger area of natural wind flow. Even if there is a slight deviation in the wind direction, the wide opening design can maximize the reception of natural wind and avoid air volume loss or collection blind spots caused by the air inlet being too narrow. At the same time, as the size of the windward trough 3 gradually decreases towards the decomposition first trough 2, according to the principle of fluid dynamics continuity, the airflow will be gradually accelerated during the flow process. This allows the natural wind entering the windward trough 3 to push the alkaline vapor in the gap towards the exhaust trough 4, avoiding the alkaline vapor from stagnating and accumulating due to insufficient flow velocity.
[0038] Optionally, the windward slot 3, as the inlet of natural wind, has a wider first air inlet 31, W1, which can effectively expand the range of natural wind reception and avoid air volume loss or blind spots caused by a narrow air inlet, thereby providing more sufficient airflow power for the gap area. The exhaust slot 4, as the outlet of alkaline vapor, has a narrower second air inlet, W2. According to the principle of fluid mechanics continuity, when natural wind carries alkaline vapor from the wider windward slot 3 and flows through the gap area to the narrower exhaust slot 4, the airflow speed will increase due to the reduced flow area. The high-speed airflow can drive the alkaline vapor toward the exhaust slot 4, preventing the alkaline vapor from accumulating on the surface of the reducer 1 or the decomposition tank 2 due to insufficient flow velocity.
[0039] In an optional embodiment, the inner wall of the windward sluice 3 is provided with a first guide plate arranged along its length. The inclination angle of the first guide plate is 30° to 60°, and the first guide plate guides the natural airflow to the gap between the decomposition tank and the reducer 1. The inner wall of the exhaust sluice 4 is provided with a second guide plate arranged along its length. The extension direction of the second guide plate forms an angle of 15° to 60° with the airflow. When the natural air enters the windward sluice 3, its direction may be dispersed. The inclination angle design of the first guide plate can effectively correct the airflow direction, and guide the natural air to the gap area between the decomposition tank and the reducer 1 through the inclination angle. The arrangement of the guide plate along the length of the windward sluice 3 ensures that the airflow direction is consistent throughout the entire introduction path, avoiding airflow turbulence or dispersion caused by the lack of guidance in local areas. After the natural air enters the gap area through the windward sluice 3, the flow direction may be locally disturbed due to obstacles in the gap or fluctuations in the external wind field. The inclination angle design of the second guide plate can effectively correct the airflow path, redirecting the turbulent airflow into a concentrated flow along the length of the exhaust sluice 4.
[0040] In an optional embodiment, the side of the exhaust duct 4 furthest from the reducer 1 is the air outlet, and the height of the air outlet is higher than the height of the top surface of the first decomposition duct 2. A metal filter 5 is provided at the first air inlet 31. When natural wind or ducted exhaust carrying alkaline vapor enters the exhaust duct 4, it will flow along the duct body towards the air outlet. The higher air outlet position provides a more direct upward path for the alkaline vapor, avoiding the stagnation of alkaline vapor in the exhaust duct 4 due to the air outlet being too low. During the process of natural wind entering the windward duct 3, it may carry dust, leaves, insects or other debris. If these debris directly enters the interior of the windward duct 3, they are likely to adhere to the surface of the guide plate or block the gaps between the guide plates, resulting in increased airflow resistance, reduced flow efficiency, and even local airflow turbulence caused by debris accumulation, affecting the directional exhaust of alkaline vapor. The mesh structure of the metal filter 5 can accurately intercept such impurities, ensuring that the debris is blocked on the outside of the filter, while allowing natural wind to pass smoothly.
[0041] In an optional embodiment, a protective cover is also included, which covers the gap area between the reducer 1 and the decomposition tank 2. During operation, the reducer 1 and the decomposition tank 2 may experience slight displacement due to vibration or thermal expansion and contraction. The gap area is prone to becoming a weak point for alkaline vapor leakage. At the same time, dust, rainwater, and other debris in the external environment may also enter through the gap, leading to blockage of the airflow channel or corrosion of components. The covering structure of the protective cover can directly block the connection between the gap and the external environment, forming a closed or semi-closed protective space. On the one hand, it can effectively prevent alkaline vapor from overflowing disorderly from the gap into the inspection channel or surrounding area, avoiding corrosion of the equipment shell caused by the diffusion of alkaline vapor. On the other hand, it can block external dust, rainwater, and other debris from entering the gap, avoiding blockage of the inlet of the exhaust duct 4 or the windward duct 3 due to the accumulation of debris.
[0042] The connection between the protective cover and the surface of the first decomposition tank 2 is sealed using a sealing flange. The sealing flange typically consists of two flanges with bolt holes and a gasket in the middle. After the bolts are tightened evenly, the gasket fully fills the tiny gap at the connection between the protective cover and the first decomposition tank 2, forming a continuous sealing interface. This effectively prevents the leakage of alkaline vapor from this connection to the external inspection channel or the surrounding environment. A liquid collection groove is provided on the sealing flange and is connected to the first decomposition tank 2. After the alkaline vapor is introduced into the gap area through the windward slot 3, some of the alkaline vapor will condense due to natural wind cooling, forming an alkaline liquid. This liquid easily adheres to the surface of the sealing flange or the connection gap. The recessed structure of the liquid collection groove can accurately capture this condensate and guide the liquid to flow along the tank towards the first decomposition tank 2. The opening connecting to the first decomposition tank 2 directly introduces the collected liquid into the interior of the first decomposition tank 2, preventing the condensate from accumulating at the flange connection to form droplets or a liquid layer.
[0043] The implementation principle of this application embodiment is as follows: Since the opening orientation of the windward trough 3 is set according to the actual wind direction, the structure of the windward trough 3 communicating with the surface of the first decomposition trough 2 can efficiently guide the natural wind to flow into the gap area between the reducer 1 and the first decomposition trough 2, forming a stable inlet airflow; at the same time, the exhaust trough 4 is set on the other side of the reducer 1 and communicates with the surface of the first decomposition trough 2, together with the windward trough 3, to construct an airflow path from the windward trough 3 to the natural wind, which flows through the gap area to the exhaust trough 4 for discharge; during this process, the natural wind will drive the alkaline vapor in the gap to move towards the exhaust trough 4, avoiding the alkaline vapor from accumulating vertically upward due to density differences or disordered diffusion, thereby reducing the direct contact corrosion of alkaline vapor on the reducer 1 housing, stirring motor and other precision components, and reducing the risk of equipment short circuit or lubrication failure; in addition, the directional discharge function of the exhaust trough 4 can create a micro-negative pressure environment in the gap area, promoting the continuous flow of alkaline vapor to the exhaust trough 4 and finally discharge.
[0044] The above are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.
Claims
1. A protective device for a mixing reducer, disposed between the reducer (1) and the decomposition tank (2), characterized in that, It includes a windward slot (3) provided on one side of the reducer (1) and an exhaust slot (4) provided on the reducer (1) on the opposite side of the windward slot (3), wherein the opening orientation of the windward slot (3) is set according to the wind direction; The windward groove (3) is connected to the groove surface of the first decomposition groove (2), and the exhaust groove (4) is connected to the groove surface of the first decomposition groove (2).
2. The protection device for the mixer reducer according to claim 1, characterized in that, The windward groove (3) has a first air inlet (31) on the windward side, and the size of the windward groove (3) gradually increases from the first decomposition groove (2) to the first air inlet (31).
3. The protection device for the mixing reducer according to claim 2, characterized in that, The opening of the exhaust duct (4) facing the windward duct (3) is the second air inlet. The width of the first air inlet (31) is W1, and the width of the second air inlet is W2, wherein W1 ≥ 1.5W2.
4. The protection device for the mixer reducer according to claim 2, characterized in that, The inner wall of the windward trough (3) is provided with a first guide plate arranged along its length direction. The inclination angle of the first guide plate is 30° to 60°. The first guide plate guides the natural airflow to the gap between the decomposition trough (2) and the reducer (1).
5. The protection device for the mixer reducer according to claim 4, characterized in that, The inner wall of the exhaust duct (4) is provided with a second guide plate arranged along its length, and the extension direction of the second guide plate forms an angle of 15°-60° with the airflow.
6. The protection device for the mixer reducer according to claim 1, characterized in that, It also includes a protective cover that covers the gap area between the reducer (1) and the surface of the decomposition first groove (2).
7. The protection device for the mixer reducer according to claim 6, characterized in that, The protective cover is connected to the surface of the first decomposition tank (2) by a sealing element, wherein the sealing element is a sealing flange.
8. The protection device for the mixer reducer according to claim 7, characterized in that, The sealing flange is provided with a liquid collection groove, which is connected to the decomposition first tank (2).
9. The protection device for the mixer reducer according to claim 1, characterized in that, The exhaust trough (4) has an air outlet on the side away from the reducer (1), and the height of the air outlet is higher than the height of the top surface of the decomposition trough (2).
10. The protection device for the mixing reducer according to claim 2, characterized in that, A metal filter (5) is provided at the first air inlet (31).