Negative-pressure adjustment-free smoke exhaust pipe

Abstract

The utility model discloses a negative pressure adjustment-free smoke exhaust pipe, which relates to the technical field of smoke exhaust and comprises a first smoke pipe, a branch pipe and a second smoke pipe, a reducer pipe assembly is arranged between the first smoke pipe and the second smoke pipe, and the diameter of the reducer pipe assembly is fixed and smaller than that of the first smoke pipe and that of the second smoke pipe. The reducer pipe assembly comprises a connecting pipe, a thin pipe is arranged in the middle of the connecting pipe, the diameter of the thin pipe is smaller than that of the connecting pipe, and the two ends of the connecting pipe are connected with the first smoke pipe and the second smoke pipe through a first reducer pipe flange and a second reducer pipe flange. The diameters of the thin pipes are different according to the air volume and the distance, so that the thin pipes always keep full-load smoke discharge, an adjusting valve on an original branch pipe is omitted, the size of the thin pipes is designed, the air draft amount and the negative pressure of each electrolytic bath are stable and unchanged, heat dissipation of the electrolytic bath is uniform, the wind power of a main smoke discharge fan is kept stable, and the service life of the electrolytic bath is prolonged. The pipes enable the air draft amount of each electrolytic cell to be consistent, and the electrolytic cells are uniform in heat dissipation.

Description

Technical Field

[0001] The utility model relates to the technical field of smoke exhaust, in particular to a negative-pressure non-adjustable smoke exhaust pipe. Background Technique

[0002] The smoke exhaust pipe of the aluminum electrolysis cell plays a crucial role in the aluminum electrolysis production process. Aluminum electrolysis is a complex chemical process that involves converting alumina into metallic aluminum and is achieved by electrolyzing a mixture of molten aluminum fluoride and cryolite (electrolyte). A large amount of harmful gases and particulate matter are generated during this process, mainly including fluorides, carbon dioxide, carbon monoxide, carbon fluorides, and dust, etc. The main function of the smoke exhaust pipe is to effectively discharge these harmful gases and particulate matter from the electrolysis cell to reduce pollution to the production environment, the health of workers, and the surrounding environment. The smoke exhaust system usually includes a gas collection hood, a duct, a purification device, and an exhaust port, etc. The gas collection hood is designed above the electrolysis cell, and the generated flue gas and dust are sucked into the duct through a negative-pressure system, and then transported to the purification device for treatment. For example, fluoride and other harmful substances are removed through dry or wet purification technologies, and finally, the tail gas meeting the emission standards is discharged into the atmosphere through the exhaust port.

[0003] For the original branch smoke pipe valve regulation, the opening accuracy of each valve is not high, the air extraction volume of each electrolysis cell is not fixed, and if one valve changes, all the on-site smoke exhaust branch pipe valves need to be readjusted again. It takes about two hours to adjust once, resulting in a high labor intensity for workers. In summer, the on-site temperature is high, and the working conditions are poor. Content of the Utility Model

[0004] In view of the above technical problems, the utility model discloses a negative-pressure non-adjustable smoke exhaust pipe, which includes a first smoke pipe, a branch pipe, and a second smoke pipe. A reduced-diameter pipe assembly is installed between the first smoke pipe and the second smoke pipe, and the diameter of the reduced-diameter pipe assembly is fixed and smaller than that of the first smoke pipe and the second smoke pipe.

[0005] Furthermore, the reduced-diameter pipe assembly includes a connecting pipe. The middle position of the connecting pipe is a thin pipe, and the diameter of the thin pipe is smaller than that of the connecting pipe. The two ends of the connecting pipe are connected to the first smoke pipe and the second smoke pipe through a first reduced-diameter pipe flange and a second reduced-diameter pipe flange. Through the above technical solution, the diameter of the thin pipe is set differently according to the air volume and the distance, so that the thin pipe always maintains full-load smoke exhaust, and the original regulating valve on the branch pipe is cancelled. The size of the thin pipe is designed to keep the air extraction volume and negative pressure of each electrolysis cell stable and unchanged, make the electrolysis cell dissipate heat evenly, keep the wind force of the main smoke exhaust fan stable, and make the air extraction volume of each electrolysis cell consistent and the electrolysis cell dissipate heat evenly. And it effectively solves the operation of manually adjusting the smoke exhaust branch pipe of the electrolysis cell, effectively reducing the labor intensity of workers and the problem of poor working conditions in high-temperature on-site operations.

[0006] Furthermore, a slide rail is arranged on the inner side of the thin pipe, and a first scraper is slidably installed on the slide rail, and the first scraper fits with the inner side of the thin pipe.

[0007] Further, a first guard plate and a second guard plate are provided on the first scraper.

[0008] Further, the surface of the first scraper that does not fit against the inner side of the thin tube is an inclined surface, and the positions near the first guard plate and the second guard plate are higher than the positions far from the first guard plate and the second guard plate.

[0009] Further, a second scraper is fixedly installed on the lower side of the first scraper, a third guard plate is provided on one side of the second scraper, and the second scraper fits against the connection part between the thin tube and the connecting tube.

[0010] Further, a third scraper is fixedly installed at the lower end of the thin tube, and a fourth guard plate is provided on one side of the third scraper. Through the above technical solution, the first scraper, the second scraper and the third scraper can scrape off the accumulated soot on the thin tube and the connecting tube for cleaning, ensuring the smoke passing capacity of the reduced-diameter tube assembly. At the same time, the first guard plate, the second guard plate, the third guard plate and the fourth guard plate can drive the soot to fall in one direction during the scraping process.

[0011] Further, a circular shaft is fixedly installed on the first scraper, a limiting shaft is provided at the end of the circular shaft, a first semi-circular plate and a second semi-circular plate are sleeved on the limiting shaft, a first long rod is fixedly installed at the lower end of the first semi-circular plate, a second long rod is fixedly installed on the lower side of the second semi-circular plate, and a fitting plate is fixedly installed on the second semi-circular plate, and the fitting plate clamps the first semi-circular plate. Through the above technical solution, the first semi-circular plate and the second semi-circular plate can be removed when cleaning is not required, without affecting the normal operation of the reduced-diameter tube assembly. When in use, the first semi-circular plate and the second semi-circular plate are respectively buckled on the limiting shaft, which can be quickly disassembled and assembled and can be stably used, and will not fall off during the soot scraping process.

[0012] The beneficial effects of the present utility model compared with the prior art are as follows:

[0013] (1) Through the technical solution of the present utility model, the thin tube is provided with different diameters according to the air volume and distance, so that the thin tube always maintains full-load smoke exhaust, cancels the regulating valve on the original branch pipe, designs the size of the thin tube, makes the air extraction volume and negative pressure of each electrolytic cell stable and unchanged, makes the electrolytic cell dissipate heat evenly, keeps the wind force of the main smoke exhaust fan stable, and makes the air extraction volume of each electrolytic cell consistent, and the electrolytic cell dissipates heat evenly. And it effectively solves the problem of manually adjusting the smoke exhaust branch pipe of the electrolytic cell, effectively reducing the labor intensity of workers and the poor labor conditions of high-temperature operations on site.

[0014] (2) Through the technical solution of the present utility model, the first scraper, the second scraper and the third scraper can scrape off the accumulated soot on the thin tube and the connecting tube for cleaning, ensuring the smoke passing capacity of the reduced-diameter tube assembly. At the same time, the first guard plate, the second guard plate, the third guard plate and the fourth guard plate can drive the soot to fall in one direction during the scraping process.

[0015] (3) Through the technical solution of the present utility model, the first semi-circular plate and the second semi-circular plate can be removed when cleaning is not required, without affecting the normal operation of the reduced-diameter pipe assembly. When in use, the first semi-circular plate and the second semi-circular plate are respectively buckled on the limiting shaft, enabling quick disassembly and stable use, and will not fall off during the ash scraping process. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present utility model.

[0017] Figure 2 It is a schematic diagram of the reduced-diameter pipe assembly of an embodiment of the present utility model Figure 1 .

[0018] Figure 3 is Figure 2 an enlarged view of part A in

[0019] Figure 4 It is a schematic diagram of the reduced-diameter pipe assembly of an embodiment of the present utility model Figure 2 .

[0020] Figure 5 It is a schematic diagram of the scraping plate and the guard plate of the present utility model.

[0021] Reference numerals in the drawings: 1 - first smoke pipe; 2 - branch pipe; 3 - reduced-diameter pipe assembly; 4 - second smoke pipe; 301 - thin pipe; 302 - first reduced-diameter pipe flange; 303 - connecting pipe; 304 - second reduced-diameter pipe flange; 305 - fixing bolt; 306 - blocking plate; 307 - first scraping plate; 308 - first guard plate; 309 - second guard plate; 310 - second scraping plate; 311 - third scraping plate; 312 - third guard plate; 313 - fourth guard plate; 314 - round shaft; 315 - limiting shaft; 316 - first semi-circular plate; 317 - fitting plate; 318 - second semi-circular plate; 319 - first long rod; 320 - second long rod; 321 - opening; 322 - slide rail. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the drawings in the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the protection scope of the present utility model.

[0023] As Figures 1-5A negative pressure surface-adjusting smoke exhaust pipe shown in the figure includes a first smoke pipe 1, a branch pipe 2, and a second smoke pipe 4. A reduced-diameter pipe assembly 3 is installed between the first smoke pipe 1 and the second smoke pipe 4. The diameter of the reduced-diameter pipe assembly 3 is fixed and smaller than that of the first smoke pipe 1 and the second smoke pipe 4. The smoke volume passing through the reduced-diameter pipe assembly 3 always remains full-load passing. After the technical transformation, the regulating valve on the original branch pipe 2 is cancelled.

[0024] In this embodiment, the reduced-diameter pipe assembly 3 includes a connecting pipe 303. The middle position of the connecting pipe 303 is a thin pipe 301. The diameter of the thin pipe 301 is smaller than that of the connecting pipe 303. Both ends of the connecting pipe 303 are connected to the first smoke pipe 1 and the second smoke pipe 4 through a first reduced-diameter pipe flange 302 and a second reduced-diameter pipe flange 304. The diameter of the thin pipe 301 is set differently according to the air volume and distance, so that the thin pipe 301 always maintains full-load smoke exhaust. The regulating valve on the original branch pipe 2 is cancelled. The size of the thin pipe 301 is designed to keep the air extraction volume and negative pressure of each electrolytic cell stable and unchanged, make the heat dissipation of the electrolytic cell uniform, keep the wind force of the main smoke exhaust fan stable, and make the air extraction volume of each electrolytic cell consistent and the heat dissipation of the electrolytic cell uniform. And it effectively solves the problem of manually adjusting the smoke exhaust branch pipe of the electrolytic cell, effectively reducing the labor intensity of workers and the poor working conditions of high-temperature operations on site.

[0025] In this embodiment, a slide rail 322 is arranged inside the thin pipe 301. A first scraper 307 is slidably installed on the slide rail 322. The first scraper 307 fits the inner side of the thin pipe 301. A first guard plate 308 and a second guard plate 309 are arranged on the first scraper 307. The side of the first scraper 307 that does not fit the inner side of the thin pipe 301 is an inclined surface. The position close to the first guard plate 308 and the second guard plate 309 is higher than the position far from the first guard plate 308 and the second guard plate 309. A second scraper 310 is fixedly installed on the lower side of the first scraper 307. A third guard plate 312 is arranged on one side of the second scraper 310. The second scraper 310 is an inclined surface. The end close to the third guard plate 312 is thicker than the end far from it. The second scraper 310 fits at the connection between the thin pipe 301 and the connecting pipe 303. A third scraper 311 is fixedly installed at the lower end of the thin pipe 301. A fourth guard plate 313 is arranged on one side of the third scraper 311. The third scraper 311 is an inclined surface. The end close to the fourth guard plate 313 is thicker than the end far from it.

[0026] The first scraper 307, the second scraper 310, and the third scraper 311 can scrape off the accumulated soot on the thin pipe 301 and the connecting pipe 303 for cleaning, ensuring the smoke passing volume of the reduced-diameter pipe assembly 3. The first scraper 307 moves closely along the inner wall of the thin pipe 301 and cleans in a circle. At the same time, the first guard plate 308, the second guard plate 309, the third guard plate 312, and the fourth guard plate 313 can drive the soot to fall in one direction during the scraping process.

[0027] In this embodiment, an opening 321 is provided on the lower side of the connecting pipe 303. The opening 321 is rectangular, and a sealing plate 306 is fixedly installed at the position of the opening 321. In this embodiment, a fixing bolt 305 is used for fixation and can be removed at any time. A gasket is installed between the sealing plate 306 and the reducer flange two 304 for sealing. A round shaft 314 is fixedly installed on the first scraper 307. A limit shaft 315 is provided at the end of the round shaft 314. A first semi-circular plate 316 and a second semi-circular plate 318 are sleeved on the limit shaft 315. A first long rod 319 is fixedly installed at the lower end of the first semi-circular plate 316. A second long rod 320 is fixedly installed on the lower side of the second semi-circular plate 318. A fitting plate 317 is fixedly installed on the second semi-circular plate 318, and the fitting plate 317 clamps the first semi-circular plate 316. When cleaning is not required, the first semi-circular plate 316 and the second semi-circular plate 318 can be removed without affecting the normal operation of the reducer assembly 3. When in use, the first semi-circular plate 316 and the second semi-circular plate 318 are respectively buckled on the limit shaft 315, which can be quickly disassembled and assembled and used stably, and will not fall off during the process of scraping ash.

[0028] Working principle: When too much dust accumulates in the reducer assembly 3, loosen the fixing bolt 305, open the sealing plate 306, hold the first long rod 319 and the second long rod 320, first buckle the first semi-circular plate 316 on the limit shaft 315, and then buckle the second semi-circular plate 318 on the limit shaft 315 so that the fitting plate 317 clamps the first semi-circular plate 316. Hold the first long rod 319 and the second long rod 320 together, or use other parts for fixation, and push the limit shaft 315 to rotate and rotate around the inner wall of the thin pipe 301 to clean the accumulated dust. The first long rod 319 and the second long rod 320 shake and change positions in the opening 321 to enable the first scraper 307 to rotate one week inside the thin pipe 301.

Claims

1. A negative pressure adjustment-free smoke exhaust pipe, comprising a smoke pipe 1 (1), a branch pipe (2) and a smoke pipe 2 (4), characterized in that: A reducer assembly (3) is installed between the smoke pipe one (1) and the smoke pipe two (4); the diameter of the reducer assembly (3) is fixed and smaller than that of the smoke pipe one (1) and the smoke pipe two (4).

2. The negative pressure adjustment-free smoke exhaust pipe according to claim 1, characterized in that: The reducer pipe assembly (3) comprises a connecting pipe (303), the middle position of the connecting pipe (303) is a thin pipe (301), the diameter of the thin pipe (301) is smaller than that of the connecting pipe (303), and the two ends of the connecting pipe (303) are connected to the smoke pipe 1 (1) and the smoke pipe 2 (4) through the reducer pipe flange 1 (302) and the reducer pipe flange 2 (304).

3. The negative pressure adjustment-free smoke exhaust pipe according to claim 2, characterized in that: A slide rail (322) is provided on the inner side of the capillary tube (301), and a scraper plate (307) is slidably mounted on the slide rail (322), and the scraper plate (307) is in contact with the inner side of the capillary tube (301).

4. The negative pressure adjustment-free smoke exhaust pipe according to claim 3, characterized in that: The scraper plate 1 (307) is provided with a guard plate 1 (308) and a guard plate 2 (309).

5. The negative pressure adjustment-free smoke exhaust pipe according to claim 4, characterized in that: The side of the scraper plate 1 (307) that is not in contact with the inner side of the capillary (301) is an inclined surface, and the position close to the guard plate 1 (308) and the guard plate 2 (309) is higher than the position far from the guard plate 1 (308) and the guard plate 2 (309).

6. The negative pressure adjustment-free smoke exhaust pipe according to claim 5, characterized in that: The scraper plate 2 (310) is fixedly mounted on the lower side of the scraper plate 1 (307), and a guard plate 3 (312) is arranged on one side of the scraper plate 2 (310). The scraper plate 2 (310) is attached to the connection between the capillary tube (301) and the connecting tube (303).

7. The negative pressure adjustment-free smoke exhaust pipe according to claim 6, characterized in that: A scraper plate three (311) is fixedly mounted on the lower end of the capillary tube (301), and a guard plate four (313) is disposed on one side of the scraper plate three (311).

8. The negative pressure adjustment-free smoke exhaust pipe according to claim 7, characterized in that: A circular shaft (314) is fixedly mounted on the scraper plate (307), a limiting shaft (315) is arranged at the end of the circular shaft (314), a semicircular plate (316) and a semicircular plate (318) are sleeved on the limiting shaft (315), a long rod (319) is fixedly mounted on the lower end of the semicircular plate (316), a long rod (320) is fixedly mounted on the lower side of the semicircular plate (318), a bonding plate (317) is fixedly mounted on the semicircular plate (318), and the bonding plate (317) clamps the semicircular plate (316).

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