Mechanical defoaming device
By designing a mechanical defoaming device with an eccentric defoaming impeller and puncture needle, the problems of low efficiency and high energy consumption of existing devices have been solved, achieving efficient defoaming and automated control, reducing the risk of scaling, and improving the production efficiency and environmental protection of the alkaline washing process.
Patent Information
- Application Number
- CN202520133296.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-21
- Publication Date
- 2025-12-30
- Estimated Expiration
- 2035-01-21
AI Technical Summary
Existing mechanical defoaming devices are inefficient, energy-intensive, and prone to scaling, which affects the production efficiency and environment of the alkaline washing process. Chemical defoamers can alter the properties of the alkaline washing solution, so the structure of physical defoamers needs to be improved.
Design an eccentrically positioned defoaming impeller and defoaming cover, combined with a puncture needle and nozzle, to use the eccentric impeller to generate negative pressure to draw in foam and rupture it at the puncture needle, and equip it with vibration monitoring and foam level detector to achieve automated control.
It improves defoaming efficiency, reduces energy consumption and scale risk, achieves automated operation, and ensures production stability and environmental protection.
Smart Images
Figure CN223732172U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the field of caustic washing technology in the field of steel production, in particular to a mechanical defoaming device in the caustic washing process. BACKGROUND
[0002] Alkaline solution is a medium prone to foaming. During the caustic washing process, the composition of the alkaline solution changes and a large amount of foam is generated during the circulation of the alkaline solution. Excessive foam formation affects the normal production of the production device, and the overflow of the foam also causes serious environmental pollution. In the steel industry, cold-rolled sheet is an important steel grade. In the production process of cold-rolled sheet, caustic washing is an essential process, which aims to remove oil and grease impurities on the surface of the steel strip and improve the surface quality of the steel product. The main components of the caustic washing solution are sodium hydroxide and a surfactant. During the caustic washing process, the caustic solution is usually sprayed onto the surface of the steel strip. During the reflux of the caustic solution, air is easily entrained in the caustic solution, forming bubbles. To improve the efficiency of caustic washing, electrolytic caustic washing is also a common caustic washing method. Electrolytic caustic washing uses the hydrogen and oxygen bubbles generated during electrolysis to strip the oil on the surface of the steel strip, thereby improving the efficiency of caustic washing. However, due to the generation of hydrogen and oxygen, the number of bubbles in the caustic solution also increases dramatically. The foam generated during the circulation of the caustic solution accumulates in the caustic washing tank and the caustic solution circulation tank. The foam in the caustic washing tank affects the efficiency of caustic washing, and excessive foam in the circulation tank can overflow, affecting the environment of the entire solution system and causing environmental pollution.
[0003] Therefore, to improve the quality of the steel strip and the production environment of the caustic washing unit, eliminate the foam generated during the circulation of the caustic solution, and reduce the impact of the foam on the production process and the environment, the foam in the caustic solution must be defoamed. There are two methods for defoaming the foam generated during the circulation of the caustic solution. One method is to add a certain proportion of defoaming agent to the caustic solution to inhibit the generation of solution foam. This method increases production costs and changes the properties of the caustic solution, affecting the surface quality of the steel sheet. The other method is to use a physical defoaming method. Mechanical defoaming is a typical physical defoaming method. The defoaming effect of mechanical defoaming is related to the structure of the defoamer. During the operation of the defoamer, the start-stop mode of the mechanical defoamer needs to be considered, and the method for eliminating solid substances adhering to the high-speed rotating impeller of the defoamer also needs to be considered to prevent vibration of the impeller.
[0004] Mechanical caustic solution defoaming devices are widely used, but they have low efficiency, high energy consumption, and are prone to fouling. Therefore, there is a need to invent a defoaming device to improve the defoaming efficiency. SUMMARY
[0005] In order to solve the above problems, the mechanical defoaming device is disclosed, which comprises a mounting plate, a cylindrical defoaming cover arranged below the mounting plate, a defoaming impeller arranged in the defoaming cover, the defoaming impeller being arranged eccentrically in the defoaming cover, the defoaming impeller comprising a circular plate at the upper portion and a circular ring at the lower portion, and arc-shaped blades arranged at equal angles between the circular plate and the circular ring and arranged in a right-handed manner.
[0006] The inner wall of the defoaming cover is provided with puncture needles, and the foam is moved radially to the inner wall of the defoaming cover under the action of centrifugal force after being sucked by the defoaming impeller, and is punctured by the puncture needles, so that the purpose of high-efficiency defoaming is achieved.
[0007] The lower portion of the defoaming cover is provided with a partition plate, the middle portion of the partition plate is fixedly connected with a flow guide pipe, the upper portion of the flow guide pipe extends into the defoaming impeller, and a liquid flow channel is formed between the outer wall of the flow guide pipe and the opening of the lower end of the defoaming cover.
[0008] Preferably, the upper end of the mounting plate is fixedly connected with a driving motor, the output end of the driving motor is fixedly connected with a rotating shaft, and the lower end of the rotating shaft is fixedly connected with the defoaming impeller.
[0009] Preferably, the mounting plate is fixedly connected with a vibration monitor and a foam liquid level detector. The vibration monitor is used for monitoring the vibration amplitude of the device, and the foam liquid level detector adopts a laser ranging sensor, preferably a laser sensor of the LR-TB5000 model of the Keyence company, which can detect the foam height of 0-5 meters.
[0010] Preferably, one side of the inside of the defoaming cover is provided with a nozzle, and the spray angle of the nozzle is 75° in the top view. The nozzle sprays ionized water to clean the defoaming impeller, and whether cleaning is needed can be judged according to the monitoring result of the vibration monitor.
[0011] Preferably, the upper end edge of the defoaming cover is fixedly connected with a plurality of second connecting columns, the mounting plate is provided with bolts in a penetrating manner, and the bolts are matched with the threaded holes provided on the second connecting columns. The second connecting columns and the bolts are used to realize the fixed connection of the defoaming cover and the mounting plate.
[0012] Preferably, the upper end edge of the partition plate is fixedly connected with a plurality of first connecting columns, the lower side wall of the defoaming cover is fixedly connected with a circular flange, bolts are arranged on the flange, and the bolts are matched with the threaded holes pre-provided on the first connecting columns. The first connecting columns enable the gap between the partition plate and the defoaming cover, and the liquid generated by defoaming flows out from the gap.
[0013] The beneficial effects of the present application are as follows:
[0014] 1. The defoaming cover and the defoaming impeller are arranged eccentrically, the gap size is different when the foam flows between the defoaming cover and the defoaming impeller, the pressure is also different, the defoaming effect can be provided, and the puncture needle arranged on the inner wall of the defoaming cover can also improve the defoaming effect.
[0015] 2. The nozzle is arranged, the nozzle can be controlled to clean the defoaming impeller in combination with the vibration monitor, and the risk of fouling is reduced.
[0016] 3. The foam level detector is arranged, the foam height is monitored, whether the device is started is judged according to the foam height, the device is not started all the time, and energy consumption is reduced. BRIEF DESCRIPTION OF DRAWINGS
[0017] Fig. 1 is a perspective view of the present application;
[0018] Fig. 2 is an explosion view of the present application;
[0019] Fig. 3 is a structure sectional view of the defoaming cover of the present application.
[0020] LIST OF REFERENCE NUMERALS
[0021] 1. partition plate; 2. defoaming cover; 3. vibration monitor; 4. mounting plate; 5. driving motor; 6. foam level detector; 7. first connecting column; 8. flow guide pipe; 9. flange; 10. second connecting column; 11. defoaming impeller; 12. rotating shaft; 13. nozzle. DETAILED DESCRIPTION
[0022] The present application will be further illustrated below in combination with the drawings and specific embodiments, and it should be understood that the following specific embodiments are only used to illustrate the present application and are not used to limit the scope of the present application. It should be noted that the words "front", "back", "left", "right", "up" and "down" used in the following description refer to the directions in the drawings, and the words "inner" and "outer" refer to the directions towards or away from the geometric center of a specific component.
[0023] As Figs. 1 to 3As shown, a mechanical defoaming device, comprising a mounting plate 4, the mounting plate 4 is circular, and the outermost layer of the mounting plate 4 is provided with a fixed through hole, the lower part of the mounting plate 4 is provided with a cylindrical defoaming cover 2, the lower end of the defoaming cover 2 is provided with an open thin shell, the inside of the defoaming cover 2 is provided with a defoaming impeller 11, the defoaming impeller 11 is eccentrically arranged in the inside of the defoaming cover 2, that is, the axis of the defoaming impeller 11 and the axis of the defoaming cover 2 are staggered, so that the gap between the defoaming impeller 11 and the defoaming cover 2 is not the same, the wind pressure generated by the rotation of the defoaming impeller 11 in the gap is not the same, which promotes the rupture of the foam, the defoaming impeller 11 includes an upper circular plate and a lower circular ring, and arc-shaped blades arranged at equal angles are arranged between the circular plate and the circular ring, that is, the defoaming impeller 11 will expel gas radially during rotation, and the defoaming impeller 11 will generate negative pressure inside, then the foam will be sucked.
[0024] The inner wall of the circumference of the defoaming cover 2 is provided with a puncture needle. The foam sucked and radially thrown out by the defoaming impeller 11 will hit the puncture needle, so as to break it and promote the defoaming efficiency.
[0025] The lower part of the defoaming cover 2 is provided with a partition plate 1, the partition plate 1 is a circular plate, the middle part of the partition plate 1 is fixedly connected with a flow guide pipe 8, the upper part of the flow guide pipe 8 extends to the inside of the defoaming impeller 11, when the negative pressure is generated in the inside of the defoaming impeller 11, the foam is sucked from below by means of the flow guide pipe 8, and the outside wall of the flow guide pipe 8 and the opening pre-set between the lower end of the defoaming cover 2 are a liquid flow channel, and the liquid generated by the rupture of the foam flows back from the flow channel and the upper end surface of the partition plate 1.
[0026] The upper middle part of the mounting plate 4 is fixedly connected with a driving motor 5, the driving motor 5 is fixedly connected with the mounting plate 4 in the form of a flange, the output end of the driving motor 5 is fixedly connected with a rotating shaft 12, the lower end of the rotating shaft 12 is fixedly connected with the defoaming impeller 11, and the driving motor 5 is started to drive the defoaming impeller 11 to rotate through the rotating shaft 12.
[0027] The mounting plate 4 is fixedly connected with a vibration monitor 3 and a foam liquid level detector 6. The vibration monitor 3 is used to monitor the vibration of the device, to judge whether the dynamic balance of the defoaming impeller 11 meets the requirements, the foam liquid level detector 6 is used to monitor the height of the foam, and by means of external PLC equipment, automatic control device can be realized.
[0028] One side of the inside of the defoaming cover 2 is provided with a nozzle 13, the nozzle 13 is used to clean the defoaming impeller 11, especially when the defoaming impeller 11 has dynamic balance problem, and the spray angle of the nozzle 13 is 75° from the top, so as to increase the axial flushing area as much as possible in the narrow space.
[0029] The upper end edge of the defoaming cover 2 is fixedly connected with a plurality of second connecting columns 10, bolts are arranged on the mounting plate 4, and the bolts and the preset threaded holes of the second connecting columns 10 are matched. The bolts and the second connecting columns 10 realize the connection of the defoaming cover 2 and the second connecting columns 10
[0030] The upper end edge of the partition plate 1 is fixedly connected with a plurality of first connecting columns 7, the lower part of the side wall of the defoaming cover 2 is fixedly connected with a circular flange 9, bolts are arranged on the circular flange 9, and the bolts and the preset threaded holes of the first connecting columns 7 are matched. The bolts and the first connecting columns 7 realize the fixed connection of the defoaming cover 2 and the partition plate 1, and meanwhile, the first connecting columns 7 are arranged, so that there is a gap between the partition plate 1 and the defoaming cover 2.
[0031] The technical means disclosed in the scheme of the present application is not only limited to the technical means disclosed in the above-mentioned embodiments, but also includes the technical scheme composed of any combination of the above technical features.
Claims
1. A mechanical defoaming device, characterized in that, Including the installation plate (4), the lower part of the installation plate (4) is provided with a cylindrical defoaming cover (2), the inside of the defoaming cover (2) is provided with a defoaming impeller (11), the defoaming impeller (11) is eccentrically arranged in the inside of the defoaming cover (2), the defoaming impeller (11) includes a circular plate and a lower circular ring, the circular plate and the circular ring are arranged at equal angles and the arc-shaped blades are arranged in the right direction; The defoaming cover (2) is provided with a puncture needle; The lower part of the defoaming cover (2) is provided with a partition plate (1), the middle part of the partition plate (1) is fixedly connected with a flow guide pipe (8), the upper part of the flow guide pipe (8) extends to the inside of the defoaming impeller (11), and the liquid flow channel is formed between the outer side wall of the flow guide pipe (8) and the opening of the lower end of the defoaming cover (2).
2. A mechanical defoaming device according to claim 1, characterized in that: The upper end of the installation plate (4) is fixedly connected with a driving motor (5), the output end of the driving motor (5) is fixedly connected with a rotating shaft (12), and the lower end of the rotating shaft (12) is fixedly connected with the defoaming impeller (11).
3. A mechanical defoaming device according to claim 1, characterized in that: The installation plate (4) is fixedly connected with a vibration monitor (3) and a foam liquid level detector (6).
4. A mechanical defoaming device according to claim 1, characterized in that: One side of the inside of the defoaming cover (2) is provided with a nozzle (13), and the spray angle of the nozzle (13) is 75° when viewed from above.
5. A mechanical defoaming device according to claim 1, characterized in that: The upper end edge of the defoaming cover (2) is fixedly connected with a plurality of second connecting columns (10), the installation plate (4) is provided with bolts, and the bolts are matched with the threaded holes provided on the second connecting columns (10).
6. A mechanical defoaming device according to claim 1, characterized in that: The upper end edge of the partition plate (1) is fixedly connected with a plurality of first connecting columns (7), the lower part of the side wall of the defoaming cover (2) is fixedly connected with a circular ring-shaped flange (9), the flange (9) is provided with bolts, and the bolts are matched with the threaded holes provided on the first connecting columns (7).