Device for avoiding fume backflow in a pipe cooling

Abstract

The utility model relates to the technical field of smoke treatment, and specifically discloses a device capable of avoiding the backflow of smoke in a pipeline during cooling, which comprises a smoke suction hood, a sleeve pipe connected to the upper end of the smoke suction hood, an anti-backflow mechanism arranged above the smoke suction hood, the anti-backflow mechanism comprising a mounting shell inserted into the sleeve pipe and in clearance fit with the inner wall of the sleeve pipe, a perforated disc fixedly connected to the inside of the mounting shell, a first sealing ring mounted to the upper end of the perforated disc, and a movable shaft rotatably connected to the upper side of the perforated disc through a hinge base. When the smoke suction instrument is started, the negative pressure causes the high-temperature smoke to push the circular plugging disc to rotate around the movable shaft and move away from the first sealing ring of the perforated disc, thereby opening the channel and allowing the smoke to enter the main machine for processing. After the machine is stopped, the smoke disappears, and the circular plugging disc falls back due to gravity, with its lower surface closely attached to the first sealing ring and completely covering the circular hole of the perforated disc, so that the condensed liquid flowing downward cannot pass through, thereby effectively preventing the downward backflow of the condensed liquid and eliminating the hidden danger of pollution.

Description

Technical Field

[0001] This utility model relates to the field of smoke treatment technology, and specifically discloses a device that can prevent smoke from flowing back during pipe cooling. Background Technology

[0002] In high-temperature work environments such as drying and welding, fume hoods are connected to fume extractors via pipes, forming a smoke collection and treatment system. This system efficiently collects harmful gases and fumes generated during operations through the fume hoods, and then transports them through pipes to the fume extractor for filtration, thereby purifying the working environment and protecting the health of personnel.

[0003] However, existing smoking systems have significant drawbacks: when the smoking device is turned off, the high-temperature smoke remaining in the pipes gradually cools and liquefies, and the resulting condensate flows back down the pipes under gravity. Due to the lack of an effective backflow prevention device, the condensate drips down, and if the condensate contains corrosive chemicals (such as condensates of acidic gases produced during welding), it may corrode equipment components or cause secondary pollution, leading to increased equipment maintenance costs and safety hazards.

[0004] Therefore, a device is needed to prevent the backflow of fumes during pipe cooling to solve the above problems. Utility Model Content

[0005] This invention proposes a device to prevent smoke from flowing back into the cooling pipe. The anti-backflow mechanism effectively prevents condensate from flowing back downwards, eliminating the risk of pollution.

[0006] This invention is implemented as follows: a device that prevents smoke from flowing back into the cooling pipe includes a smoke hood, the upper end of which is connected to a sleeve, and an anti-backflow mechanism is provided above the smoke hood. The anti-backflow mechanism includes a mounting shell inserted into the sleeve and with a clearance fit with its inner wall. A perforated disc is fixedly connected inside the mounting shell, and a first sealing ring is installed on the upper end of the perforated disc. A movable shaft is rotatably connected to the upper side of the perforated disc through a hinge, and a circular sealing disc that abuts against the first sealing ring is fixedly connected to the other end of the movable shaft.

[0007] A support ring is fixedly connected to the inner wall of the sleeve. A second sealing ring is installed at the upper end of the support ring, which abuts against the lower edge of the mounting shell. A third sealing ring is installed at the upper edge of the mounting shell. A clamping ring is provided above the mounting shell, which abuts against the third sealing ring. Connecting plates are fixedly connected to both the front and rear sides of the outer wall of the sleeve. A locking mechanism is provided between the clamping ring and the two connecting plates.

[0008] The upper end of the compression ring is fixedly connected to a connecting pipe communicating with its interior, and the upper end of the connecting pipe is fixedly connected to a metal telescopic tube.

[0009] As a preferred embodiment of the device for preventing smoke backflow during pipe cooling according to this utility model, the locking mechanism includes two first positioning holes distributed front to back, which are opened through the upper end of the pressure ring. The upper ends of the two connecting plates are each provided with a second positioning hole. Positioning pins are inserted into the first and second positioning holes. A tapered guide head is fixedly connected to the lower end of the positioning pin. A screw is fixedly connected to the lower end of the tapered guide head. A hexagonal nut that abuts against the lower end of the connecting plate is threaded onto the outer wall of the screw. A pressure plate that abuts against the upper end of the pressure ring is fixedly connected to the upper end of the positioning pin.

[0010] As a preferred embodiment of the present invention for preventing smoke from flowing back into the cooling pipe, a through groove is provided on the right side of the upper end of the sleeve, and a drain pipe that is inclined and passes through the through groove is connected to the right end of the mounting shell, and the drain pipe is equipped with a manual valve.

[0011] As a preferred embodiment of the present invention for preventing smoke from flowing back into the cooling pipe, the metal telescopic tube is made of 310S stainless steel.

[0012] As a preferred embodiment of the present invention for preventing smoke from flowing back into the cooling pipe, the upper end of the metal telescopic pipe is fixedly connected to a flange pipe.

[0013] As a preferred embodiment of the present invention for preventing smoke from flowing back into the cooling pipe, the first sealing ring, the second sealing ring, and the third sealing ring are all made of expanded graphite and ceramic fiber composite.

[0014] As a preferred embodiment of the present invention for preventing smoke from flowing back into the cooling pipe, the rear sides of both ends of the smoke hood are fixedly connected with mounting plates having two mounting holes.

[0015] The beneficial effects of this utility model are:

[0016] During assembly, the mounting shell is inserted into the sleeve, and the drain pipe enters the passage groove. A double static seal is formed by tightening the third and second sealing rings to prevent leakage. When the fumigation device starts, negative pressure causes the high-temperature smoke to push the circular sealing disc around the movable shaft, dislodging it from the first sealing ring on the perforated disc and opening a passage for processing by the main unit. After shutdown, the smoke dissipates, and the circular sealing disc falls back due to gravity. Its lower surface tightly adheres to the first sealing ring, completely covering the perforated disc's hole, preventing downward-flowing condensate from passing through. This effectively prevents condensate from flowing back downwards, eliminating the potential for pollution. Attached Figure Description

[0017] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0018] Figure 1 This is a front sectional view of the device of this utility model that can prevent smoke from flowing back into the cooling pipe.

[0019] Figure 2 This is a partial right-side cross-sectional view of the present invention;

[0020] Figure 3 This is a partial bottom view of the present invention;

[0021] Figure 4 This is a partial structural diagram of the present invention;

[0022] Figure 5 This is a diagram showing the external structure of the support ring and the second sealing ring of this utility model.

[0023] The markings in the diagram are: 1. Fume hood; 2. Sleeve; 3. Support ring; 4. Second sealing ring; 5. Mounting shell; 6. Perforated disc; 7. Movable shaft; 8. First sealing ring; 9. Circular sealing disc; 10. Through groove; 11. Drain pipe; 12. Third sealing ring; 13. Compression ring; 14. Connecting pipe; 15. Metal telescopic pipe; 16. Flange pipe; 17. Second positioning hole; 18. First positioning hole; 19. Positioning pin; 20. Screw; 21. Hex nut; 22. Compression disc; 23. Connecting plate; 24. Mounting plate. Detailed Implementation

[0024] The present invention will be further described below with reference to the accompanying drawings and specific embodiments to aid in understanding its content. Unless otherwise specified, the methods used in this invention are conventional methods; the raw materials and apparatus used, unless otherwise specified, are conventional commercially available products.

[0025] Please see Figure 1-5 The device that prevents smoke from flowing back into the cooling pipe includes a smoke hood 1, with a sleeve 2 connected to the upper end of the smoke hood 1. An anti-backflow mechanism is provided above the smoke hood 1. The anti-backflow mechanism includes a mounting shell 5 that is inserted into the sleeve 2 and has a clearance fit with its inner wall. A perforated disc 6 is fixedly connected inside the mounting shell 5. A first sealing ring 8 is installed on the upper end of the perforated disc 6. A movable shaft 7 is rotatably connected to the upper side of the perforated disc 6 through a hinge. A circular sealing disc 9 that abuts against the first sealing ring 8 is fixedly connected to the other end of the movable shaft 7.

[0026] A support ring 3 is fixedly connected to the inner wall of the sleeve 2. A second sealing ring 4 is installed at the upper end of the support ring 3, which abuts against the lower edge of the mounting shell 5. A third sealing ring 12 is installed at the upper edge of the mounting shell 5. A clamping ring 13 is provided above the mounting shell 5, which abuts against the third sealing ring 12. Connecting plates 23 are fixedly connected to both the front and rear sides of the outer wall of the sleeve 2. A locking mechanism is provided between the clamping ring 13 and the two connecting plates 23.

[0027] The upper end of the clamping ring 13 is fixedly connected to a connecting pipe 14 that communicates with its interior, and the upper end of the connecting pipe 14 is fixedly connected to a metal telescopic pipe 15.

[0028] In this embodiment: when assembling the device, the mounting shell 5 is inserted into the sleeve 2 from the upper end, and the lower edge of the mounting shell 5 is pre-contacted with the second sealing ring 4 at the upper end of the support ring 3. At the same time, the drain pipe 11 needs to enter the through groove 10. The sleeve 2 prevents the mounting shell 5 from moving laterally. Then, the clamping ring 13 is placed above the mounting shell 5, and the lower surface of the clamping ring 13 is pre-contacted with the third sealing ring 12. Then, the clamping ring 13 is pressed by the locking mechanism. At this time, the clamping ring 13 presses the third sealing ring 12, and at the same time, the mounting shell 5 presses the second sealing ring 4, forming a double static sealing structure to prevent fluid leakage. The flange pipe 16 is fixedly connected to the air inlet of the smoking device, and the smoking hood 1 is fixedly installed in the required position. The assembly is complete.

[0029] The metal telescopic tube 15 can withstand high temperatures to prevent deformation. The telescopic characteristics of the metal telescopic tube 15 allow the device to adapt to different installation heights and avoid stress damage caused by rigid connections.

[0030] After the smoke extraction device is started, the internal fan generates negative pressure, and high-temperature smoke enters from the bottom opening of the smoke hood 1 and flows upward into the sleeve 2. The smoke airflow acts on the lower surface of the circular sealing disc 9, generating an upward thrust, which pushes the circular sealing disc 9 to rotate around the movable shaft 7, causing the circular sealing disc 9 to separate from the first sealing ring 8 at the upper end of the perforated disc 6, opening the smoke flow channel. The smoke passes through the through hole of the perforated disc 6, the internal space of the mounting shell 5, the clamping ring 13, the connecting pipe 14 and the metal telescopic pipe 15 in sequence, and finally enters the smoke extraction device main unit for filtration.

[0031] After the smoke extraction device stops, the high-temperature smoke loses its airflow propulsion, and the circular sealing disc 9 falls back around the movable shaft 7 due to its own gravity. Its lower surface fits against the first sealing ring 8, completely covering the circular hole of the perforated disc 6. Meanwhile, the gradually cooling and liquefied condensate flows back downward under the action of gravity. At this time, the circular sealing disc 9 prevents the condensate from passing through the inside of the perforated disc 6. In this way, the purpose of effectively preventing the condensate from flowing back downward is achieved, thus eliminating the potential for pollution.

[0032] As a technical optimization of this utility model, the locking mechanism includes two first positioning holes 18 that are distributed front to back and through the upper end of the pressure ring 13. The upper ends of the two connecting plates 23 are each provided with a second positioning hole 17. Positioning pins 19 are inserted into the first positioning holes 18 and the second positioning holes 17. A tapered guide head is fixedly connected to the lower end of the positioning pin 19. A screw 20 is fixedly connected to the lower end of the tapered guide head. A hexagonal nut 21 that abuts against the lower end of the connecting plate 23 is threaded onto the outer wall of the screw 20. A pressure plate 22 that abuts against the upper end of the pressure ring 13 is fixedly connected to the upper end of the positioning pin 19.

[0033] In this embodiment: the lower end tapered guide head of the positioning pin 19 is aligned with the first positioning hole 18 of the clamping ring 13 and the second positioning hole 17 of the connecting plate 23 and inserted until the clamping plate 22 contacts the upper surface of the clamping ring 13. Then, the hexagonal nut 21 is screwed into the outside of the screw 20 until the hexagonal nut 21 abuts against the lower end of the connecting plate 23. During the continuous tightening of the hexagonal nut 21, the clamping ring 13 is pressed downward by the two clamping plates 22, thereby providing a continuous clamping force to the clamping ring 13.

[0034] As a technical optimization of this utility model, a through groove 10 is provided on the right side of the upper end of the sleeve 2, and a drain pipe 11 that is inclined and passes through the through groove 10 is connected to the right end of the mounting shell 5. The drain pipe 11 is equipped with a manual valve.

[0035] In this embodiment: By setting the through groove 10, it is convenient to provide space for the drain pipe 11 to enter. When it is necessary to clean the condensate, the operator opens the manual valve of the drain pipe 11. Since the drain pipe 11 is set at an inclination, the condensate accumulated above the perforated disc 6 flows out of the device along the drain pipe 11 under the action of gravity and is collected by an external container, so as to ensure that the condensate on the top of the perforated disc 6 is discharged when used next time.

[0036] As a technical optimization of this utility model, the metal telescopic tube 15 is made of 310S stainless steel.

[0037] In this embodiment, the 310S stainless steel metal telescopic pipe 15 can withstand high temperatures of 300-500℃, preventing high-temperature fumes from causing pipe deformation or releasing harmful substances.

[0038] As a technical optimization of this utility model, a flange pipe 16 is fixedly connected to the upper end of the metal telescopic pipe 15.

[0039] In this embodiment, the flange 16 at the upper end of the metal telescopic tube 15 is fixedly connected to the air inlet of the smoke extractor by bolts, forming a detachable rigid connection.

[0040] As a technical optimization of this utility model, the first sealing ring 8, the second sealing ring 4 and the third sealing ring 12 are all made of expanded graphite and ceramic fiber composite.

[0041] In this embodiment, the expanded graphite and ceramic fiber composite material is molded. The layered structure of the expanded graphite provides a flexible seal, while the ceramic fiber enhances tear resistance and has a temperature range of 800-1200℃, far exceeding the operating temperature of the device, thus avoiding the failure of traditional rubber seals due to high-temperature aging.

[0042] As a technical optimization of this utility model, the rear sides of both ends of the smoking hood 1 are fixedly connected with mounting plates 24 having two mounting holes.

[0043] In this embodiment, the mounting holes on the mounting plate 24 can be used to fix the smoke hood 1 to the wall using expansion bolts, thereby fixing the position of the smoke hood 1.

[0044] The working principle and usage process of this utility model are as follows: When assembling the device, insert the mounting shell 5 into the sleeve 2 from the upper end, and make the lower edge of the mounting shell 5 pre-contact with the second sealing ring 4 at the upper end of the support ring 3. At the same time, the drain pipe 11 should enter the through groove 10. The sleeve 2 prevents the mounting shell 5 from moving laterally. Then, place the clamping ring 13 above the mounting shell 5, and make the lower surface of the clamping ring 13 pre-contact with the third sealing ring 12. Subsequently, align the lower end of the positioning pin 19 with the first positioning hole 18 of the clamping ring 13 and the second positioning hole 17 of the connecting plate 23 and insert it until... The clamping plate 22 contacts the upper surface of the clamping ring 13, and then the hexagonal nut 21 is screwed into the outside of the screw 20 until the hexagonal nut 21 abuts against the lower end of the connecting plate 23. During the continuous tightening of the hexagonal nut 21, the clamping ring 13 is pressed down by the two clamping plates 22. At this time, the third sealing ring 12 is pressed by the clamping ring 13, and the second sealing ring 4 is pressed by the mounting shell 5, forming a double static sealing structure to prevent fluid leakage. The flange pipe 16 is fixedly connected to the air inlet of the smoke extractor, and the smoke hood 1 is fixedly installed in the required position. The assembly is complete.

[0045] The metal telescopic tube 15 is made of 310S stainless steel and can withstand high temperatures of 300-500℃. Its telescopic characteristics allow the device to adapt to different installation heights and avoid stress damage caused by rigid connections.

[0046] After the smoke extraction device is started, the internal fan generates negative pressure, and high-temperature smoke enters from the bottom opening of the smoke hood 1 and flows upward into the sleeve 2. The smoke airflow acts on the lower surface of the circular sealing disc 9, generating an upward thrust, which pushes the circular sealing disc 9 to rotate around the movable shaft 7, causing the circular sealing disc 9 to separate from the first sealing ring 8 at the upper end of the perforated disc 6, opening the smoke flow channel. The smoke passes through the through hole of the perforated disc 6, the internal space of the mounting shell 5, the clamping ring 13, the connecting pipe 14 and the metal telescopic pipe 15 in sequence, and finally enters the smoke extraction device main unit for filtration.

[0047] After the smoke extraction device stops, the high-temperature smoke loses its airflow propulsion, and the circular sealing disc 9 falls back around the movable shaft 7 due to its own gravity. Its lower surface fits against the first sealing ring 8, completely covering the circular hole of the perforated disc 6. Meanwhile, the gradually cooling and liquefied condensate flows back downward under the action of gravity. At this time, the circular sealing disc 9 prevents the condensate from passing through the inside of the perforated disc 6. In this way, the purpose of effectively preventing the condensate from flowing back downward is achieved, thus eliminating the potential for pollution.

[0048] When it is necessary to clean the condensate, the operator opens the manual valve of the drain pipe 11. Due to the inclined setting of the drain pipe 11, the condensate accumulated above the perforated disc 6 flows out of the device along the drain pipe 11 under the action of gravity and is collected through an external container, so as to ensure that the condensate on the top of the perforated disc 6 is drained when used next time.

[0049] In the description of this utility model, it should be understood that the terms "left", "right", "up", "down", "top", "bottom", "front", "back", "inner", "outer", "back", "middle", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0050] However, the above description is only a specific embodiment of this utility model and should not be construed as limiting the scope of implementation of this utility model. Therefore, any substitution of equivalent components or equivalent changes and modifications made in accordance with the scope of protection of this utility model should still fall within the scope of the claims of this utility model.

Claims

1. A device for preventing smoke from flowing back into a cooling duct, comprising a fume hood (1), characterized in that: The upper end of the smoking hood (1) is connected to a sleeve (2). An anti-backflow mechanism is provided above the smoking hood (1). The anti-backflow mechanism includes a mounting shell (5) inserted into the sleeve (2) and fitted with a clearance between the sleeve (2) and its inner wall. A perforated disc (6) is fixedly connected inside the mounting shell (5). A first sealing ring (8) is installed on the upper end of the perforated disc (6). A movable shaft (7) is rotatably connected to the upper side of the perforated disc (6) through a hinge. A circular sealing disc (9) that abuts against the first sealing ring (8) is fixedly connected to the other end of the movable shaft (7). The inner wall of the sleeve (2) is fixedly connected to a support ring (3). The upper end of the support ring (3) is equipped with a second sealing ring (4) that abuts against the lower edge of the mounting shell (5). The upper edge of the mounting shell (5) is equipped with a third sealing ring (12). A clamping ring (13) that abuts against the third sealing ring (12) is provided above the mounting shell (5). Connecting plates (23) are fixedly connected to both the front and rear sides of the outer wall of the sleeve (2). A locking mechanism is provided between the clamping ring (13) and the two connecting plates (23). The upper end of the compression ring (13) is fixedly connected to a connecting pipe (14) communicating with its interior, and the upper end of the connecting pipe (14) is fixedly connected to a metal telescopic pipe (15).

2. The device for preventing smoke backflow during pipe cooling according to claim 1, characterized in that: The locking mechanism includes two first positioning holes (18) that are distributed front to back and through the upper end of the pressure ring (13). The upper ends of the two connecting plates (23) are each provided with a second positioning hole (17). A positioning pin (19) is inserted into the first positioning hole (18) and the second positioning hole (17). A tapered guide head is fixedly connected to the lower end of the positioning pin (19). A screw (20) is fixedly connected to the lower end of the tapered guide head. A hexagonal nut (21) that abuts against the lower end of the connecting plate (23) is threaded onto the outer wall of the screw (20). A pressure plate (22) that abuts against the upper end of the pressure ring (13) is fixedly connected to the upper end of the positioning pin (19).

3. The device for preventing smoke backflow during pipe cooling according to claim 1, characterized in that: A through groove (10) is provided on the right side of the upper end of the sleeve (2), and a drain pipe (11) is inclined and passes through the through groove (10) at the right end of the mounting shell (5). The drain pipe (11) is equipped with a manual valve.

4. The device for preventing smoke backflow during pipe cooling according to claim 1, characterized in that: The metal telescopic tube (15) is made of 310S stainless steel.

5. The device for preventing smoke backflow during pipe cooling according to claim 1, characterized in that: The upper end of the metal telescopic tube (15) is fixedly connected to a flange tube (16).

6. The device for preventing smoke backflow during pipe cooling according to claim 1, characterized in that: The first sealing ring (8), the second sealing ring (4) and the third sealing ring (12) are all made of expanded graphite and ceramic fiber composite.

7. The device for preventing smoke backflow during pipe cooling according to claim 1, characterized in that: The smoking hood (1) has mounting plates (24) with two mounting holes fixedly connected to the rear sides of both the left and right ends.

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