A flue gas stack hood

Abstract

The utility model relates to a smoke exhaust air duct hood technical field especially, relates to a kind of smoke exhaust air duct hood, including installation base, central pivot, several rotating bearings, several fan blade hubs, annular fan blade wheel, top cover, at least one of each rotating bearing is one-way bearing, installation base is equipped with several support rods, top cover is suspended and set on annular fan blade wheel top by each support rod, top cover and annular fan blade wheel top portion form top exhaust passage, the bottom of central pivot is connected with installation base, the top of central pivot is connected with top cover;The utility model can avoid the situation that annular fan blade wheel reverses and makes outdoor air pour into smoke exhaust air duct and causes exhaust difficulty, reduces the load of bearing and other rotating parts, slows down the wear of bearing and other rotating parts, can greatly reduce the instability of swing when rotating, overall smoke flow is more smooth, can improve overall exhaust effect, and smoke exhaust effect is better.

Description

Technical fields:

[0001] This utility model relates to the field of exhaust duct cap technology, and in particular to an exhaust duct cap. Background technology:

[0002] A smoke exhaust duct hood, also commonly known as a windproof hood, exhaust cap, or smoke duct terminal, is a key component installed at the exit of public smoke exhaust ducts in residential buildings, office buildings, and other buildings. Its main function is to ensure smooth exhaust from the smoke duct while preventing outdoor wind, rain, snow, and foreign objects from flowing back into the smoke exhaust duct.

[0003] Most existing exhaust duct vent caps have structures similar to those disclosed in patent application number CN202411544932.2, including a mounting base, a central rotating shaft vertically mounted on the mounting base, several rotating bearings mounted on the central rotating shaft, several impeller hubs rotatably connected to the central rotating shaft via the rotating bearings, an annular impeller connected to each impeller hub, and a top cover covering the top of the annular impeller. However, existing exhaust duct vent caps have the following shortcomings in practical use: 1. When there is no natural wind and the temperature inside the exhaust duct is lower than the outdoor temperature, or when the pressure difference caused by the temperature difference inside the exhaust duct being lower than the outdoor temperature is greater than the pressure difference generated by the outdoor natural wind passing through the annular impeller, the annular impeller... 1. The impeller rotates in the opposite direction, causing outdoor air to flow into the exhaust duct and making exhaust difficult. 2. The existing exhaust duct cap is fixed to the annular impeller and rotates synchronously. This design not only increases the load on rotating parts such as bearings and accelerates their wear, but also increases the instability of swaying during rotation. 3. When the exhaust is rotated outward, the flue gas flows vertically upward from the exhaust duct opening. Some of the flue gas is discharged directly outward by centrifugal force, while some of the flue gas is blocked and changes direction after encountering the rotating cap. The overall flue gas flow is not smooth, especially when the annular impeller and cap rotate at high speed. The overall flue gas exhaust effect is generally poor. Utility model content:

[0004] The purpose of this invention is to provide a smoke exhaust duct cap that addresses the shortcomings of existing technologies. The annular impeller can only rotate in one direction and there is no reverse rotation, which can prevent outdoor air from flowing into the smoke exhaust duct and causing exhaust difficulties due to reverse rotation of the annular impeller. The top cover is independently suspended above the annular impeller, which reduces the load on rotating parts such as bearings and slows down the wear of rotating parts. It can greatly reduce the instability of swaying during rotation, and the overall smoke flow direction is smoother, which can improve the overall ventilation effect and the smoke exhaust effect.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a smoke exhaust duct cap, comprising a mounting base, a central rotating shaft arranged vertically on the mounting base, a plurality of rotating bearings arranged on the central rotating shaft, a plurality of impeller hubs rotatably connected to the central rotating shaft through the rotating bearings, an annular impeller connected to each impeller hub, and a top cover. At least one of the rotating bearings is a one-way bearing. The mounting base is provided with a plurality of support rods. The top cover is suspended above the annular impeller through the support rods. A top exhaust channel is formed between the top cover and the top of the annular impeller. The bottom of the central rotating shaft is connected to the mounting base, and the top of the central rotating shaft is connected to the top cover.

[0006] A further improvement to the above scheme is that the annular impeller includes an upper frame, a lower frame, and a plurality of vertical blades spaced apart between the upper and lower frames along the circumferential direction.

[0007] A further improvement to the above scheme is that each of the vertical wind blades includes an inner vertical guide plate, a middle vertical guide plate, and an outer vertical guide plate. One end of the inner vertical guide plate is located close to the inner side of the annular wind turbine, and the other end of the inner vertical guide plate is inclined outward. One end of the outer vertical guide plate is located close to the outer side of the annular wind turbine, and the other end of the outer vertical guide plate is inclined inward. One end of the middle vertical guide plate is connected to the outer end of the inner vertical guide plate, and the other end of the middle vertical guide plate is connected to the inner end of the outer vertical guide plate.

[0008] A further improvement to the above scheme is that the inner vertical guide plate, the middle vertical guide plate, and the outer vertical guide plate in each of the vertical wind blades are integrally stamped.

[0009] A further improvement to the above scheme is that the included angle between the inner vertical guide plate and the middle vertical guide plate located in the same vertical wind blade is 120-160°, and the included angle between the outer vertical guide plate and the middle vertical guide plate located in the same vertical wind blade is 120-160°.

[0010] A further improvement to the above scheme is that there are two wind turbine hubs, one of which is connected to the upper wheel frame and the other is connected to the lower wheel frame.

[0011] A further improvement to the above solution is that there are multiple support rods, the top of each support rod is connected to the top cover, the bottom of each support rod is connected to the mounting base, and the support rods are evenly distributed along the circumferential direction.

[0012] A further improvement to the above solution is that the mounting base is provided with a plurality of mounting and reinforcing ears, and each mounting and reinforcing ear is formed with a locking hole.

[0013] A further improvement to the above solution is that the number of mounting and reinforcing ears is the same as the number of support rods, and each mounting and reinforcing ear is integrally formed with each support rod.

[0014] A further improvement to the above solution is that the top cover is a bowl-shaped structure with the opening facing downwards and the diameter gradually decreasing from bottom to top.

[0015] The beneficial effects of this utility model are as follows: The exhaust duct cap provided by this utility model includes a mounting base, a central rotating shaft arranged vertically on the mounting base, a plurality of rotating bearings arranged on the central rotating shaft, a plurality of impeller hubs rotatably connected to the central rotating shaft through the rotating bearings, an annular impeller connected to each impeller hub, and a top cover. At least one of the rotating bearings is a one-way bearing. The mounting base is provided with a plurality of support rods. The top cover is suspended above the annular impeller through the support rods. A top exhaust channel is formed between the top cover and the top of the annular impeller. The bottom of the central rotating shaft is connected to the mounting base, and the top of the central rotating shaft is connected to the top cover.

[0016] Compared with existing exhaust duct caps, this utility model has the following advantages:

[0017] 1. By setting a one-way bearing, the annular impeller can only rotate in one direction and there is no reverse rotation. This can prevent outdoor air from flowing into the exhaust duct and causing exhaust difficulties due to the reverse rotation of the annular impeller.

[0018] 2. By independently suspending the top cover above the annular impeller, this utility model not only reduces the load on rotating parts such as bearings and slows down the wear of rotating parts such as bearings, but also significantly reduces the product damage rate and maintenance costs. In addition, by changing the top cover to be fixed as an integral part with the mounting base and connected to the top of the central rotating shaft, this utility model can greatly reduce the instability of swaying during rotation.

[0019] 3. This utility model suspends the top cover above the annular impeller and forms a top exhaust channel between the top of the annular impeller and the top of the annular impeller. When the exhaust is rotated outward, the flue gas flows vertically upward from the exhaust port. Some of the flue gas is discharged directly outward with centrifugal force, and some of the flue gas flows vertically upward and is discharged outward along the top cover from the top exhaust channel. The overall flue gas flow direction is smoother, which can improve the overall ventilation effect and the flue gas discharge effect is better. Attached image description:

[0020] Figure 1 This is a schematic diagram of the structure of this utility model.

[0021] Figure 2 This is a structural schematic diagram from another perspective of the present invention.

[0022] Explanation of reference numerals in the attached drawings: 1. Mounting base; 2. Central rotating shaft; 3. Rotary bearing; 4. Fan hub; 5. Annular fan wheel; 51. Upper wheel frame; 52. Lower wheel frame; 53. Vertical fan blade; 53. Inner vertical guide plate; 531. Middle vertical guide plate; 532. Outer vertical guide plate; 533. Top cover; 6. Support rod; 7. Top exhaust channel; 8. Mounting reinforcement ear; 9. Locking hole; 10. Detailed implementation method:

[0023] The present invention will be further described below with reference to the accompanying drawings, such as... Figure 1-2 As shown, this utility model includes a mounting base 1, a central rotating shaft 2 vertically mounted on the mounting base 1, several rotating bearings 3 mounted on the central rotating shaft 2, several impeller hubs 4 rotatably connected to the central rotating shaft 2 via the rotating bearings 3, an annular impeller 5 connected to each impeller hub 4, and a top cover 6. At least one of the rotating bearings 3 is a one-way bearing. The mounting base 1 is provided with several support rods 7. The top cover 6 is suspended above the annular impeller 5 via the support rods 7, forming a top exhaust channel 8 between the top cover 6 and the top of the annular impeller 5. The bottom of the central rotating shaft 2 is connected to the mounting base 1, and the top of the central rotating shaft 2 is connected to the top cover 6. Compared with existing exhaust duct caps, this utility model has the following advantages:

[0024] 1. By setting a one-way bearing, the annular impeller 5 can only rotate in one direction and there is no reverse rotation. This can prevent outdoor air from flowing into the exhaust duct and causing exhaust difficulties due to the reverse rotation of the annular impeller 5.

[0025] 2. By independently suspending the top cover 6 above the annular impeller 5, this utility model not only reduces the load on rotating parts such as bearings and slows down the wear of rotating parts such as bearings, but also significantly reduces the product damage rate and maintenance costs. In addition, by changing the top cover 6 to be fixed as an integral part with the mounting base 1 and connected to the top of the central rotating shaft 2, this utility model can greatly reduce the instability of swaying during rotation.

[0026] 3. This utility model suspends the top cover 6 above the annular impeller 5 and forms a top exhaust channel 8 between the top of the annular impeller 5 and the top of the annular impeller 5. When the exhaust is rotated outward, the flue gas flows vertically upward from the exhaust port. Some of the flue gas is discharged directly outward with centrifugal force, and some of the flue gas flows vertically upward and is discharged outward along the top cover 6 from the top exhaust channel 8. The overall flue gas flow direction is smoother, which can improve the overall ventilation effect and the flue gas discharge effect is better.

[0027] The annular impeller 5 includes an upper frame 51, a lower frame 52, and a plurality of vertical blades 53 spaced apart between the upper frame 51 and the lower frame 52 along the circumferential direction. Compared with the arc-shaped blades, the vertical blades 53 of this invention are straight, which is not only easier to process and manufacture, but also better ensures that the product is not easily deformed or damaged during production, transportation, installation and other processes.

[0028] Each of the vertical blades 53 includes an inner vertical guide plate 531, a middle vertical guide plate 532, and an outer vertical guide plate 533. One end of the inner vertical guide plate 531 is located close to the inner side of the annular impeller 5, and the other end of the inner vertical guide plate 531 is inclined outward. One end of the outer vertical guide plate 533 is located close to the outer side of the annular impeller 5, and the other end of the outer vertical guide plate 533 is inclined inward. One end of the middle vertical guide plate 532 is connected to the outer end of the inner vertical guide plate 531, and the other end of the middle vertical guide plate 532 is connected to the inner end of the outer vertical guide plate 533. Compared with the curved blades, which may generate flutter or pulse thrust under wind action, resulting in unstable rotation and noise, this utility model, through the adoption of a three-section structure design, can better enable the flue gas to flow continuously and smoothly over the blade surface, thereby better achieving flue gas guidance and discharge.

[0029] The inner vertical guide plate 531, the middle vertical guide plate 532, and the outer vertical guide plate 533 of each vertical wind blade 53 are integrally stamped, which not only reduces the number of parts and makes assembly easier, but also improves the overall structural strength and enables better guidance and discharge of flue gas.

[0030] The included angle between the inner vertical guide plate 531 and the middle vertical guide plate 532 located in the same vertical wind blade 53 is preferably 120-160°, and the included angle between the outer vertical guide plate 533 and the middle vertical guide plate 532 located in the same vertical wind blade 53 is preferably 120-160°.

[0031] There are two impeller hubs 4, one of which is connected to the upper wheel frame 51 and the other is connected to the lower wheel frame 52; there are multiple support rods 7, the top of each support rod 7 is connected to the top cover 6, the bottom of each support rod 7 is connected to the mounting base 1, and the support rods 7 are evenly distributed along the circumference.

[0032] The mounting base 1 is provided with several mounting and reinforcing ears 9, and each mounting and reinforcing ear 9 is formed with a locking hole 10. By setting the mounting and reinforcing ears 9, the screws are passed through the locking holes 10 and locked, which can further make the mounting base 1 more stable and securely installed on the flue.

[0033] In this embodiment, the number of mounting and reinforcing ears 9 is the same as that of the support rods 7. Each mounting and reinforcing ear 9 is integrally formed with each support rod 7, resulting in fewer overall parts and easier assembly. Of course, in other embodiments, the mounting and reinforcing ears 9 of this utility model can also be set independently and connected to the mounting base 1.

[0034] The top cover 6 is a bowl-shaped structure with an opening facing downwards and a diameter that gradually decreases from bottom to top. The vertically upward flue gas flows obliquely downwards along the inner side of the top cover 6 and is discharged outwards from the top exhaust channel 8 between the top cover 6 and the annular impeller 5. This can further ensure that the overall exhaust airflow is smoother and can better guide the exhaust of the flue gas.

[0035] Of course, the above description is only a preferred embodiment of the present utility model. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the claims of the present utility model patent application are included in the scope of the present utility model patent application.

Claims

1. A flue gas duct hood, comprising a mounting base (1), a central rotating shaft (2) vertically mounted on the mounting base (1), a plurality of rotary bearings (3) mounted on the central rotating shaft (2), a plurality of impeller hubs (4) rotatably connected to the central rotating shaft (2) via the rotary bearings (3), an annular impeller (5) connected to each impeller hub (4), and a top cover (6), characterized in that: At least one of the rotating bearings (3) is a one-way bearing. The mounting base (1) is provided with several support rods (7). The top cover (6) is suspended above the annular impeller (5) through the support rods (7). A top exhaust channel (8) is formed between the top cover (6) and the top of the annular impeller (5). The bottom of the central rotating shaft (2) is connected to the mounting base (1), and the top of the central rotating shaft (2) is connected to the top cover (6).

2. The exhaust duct cap according to claim 1, characterized in that: The annular impeller (5) includes an upper frame (51), a lower frame (52), and a plurality of vertical blades (53) spaced apart between the upper frame (51) and the lower frame (52) along the circumferential direction.

3. The exhaust duct cap according to claim 2, characterized in that: Each of the vertical wind blades (53) includes an inner vertical guide plate (531), a middle vertical guide plate (532), and an outer vertical guide plate (533). One end of the inner vertical guide plate (531) is located close to the inner side of the annular wind impeller (5), and the other end of the inner vertical guide plate (531) is inclined outward. One end of the outer vertical guide plate (533) is located close to the outer side of the annular wind impeller (5), and the other end of the outer vertical guide plate (533) is inclined inward. One end of the middle vertical guide plate (532) is connected to the outer end of the inner vertical guide plate (531), and the other end of the middle vertical guide plate (532) is connected to the inner end of the outer vertical guide plate (533).

4. The exhaust duct cap according to claim 3, characterized in that: The inner vertical guide plate (531), the middle vertical guide plate (532), and the outer vertical guide plate (533) of each vertical wind blade (53) are integrally stamped.

5. A smoke exhaust duct cap according to claim 3, characterized in that: The included angle between the inner vertical guide plate (531) and the middle vertical guide plate (532) located in the same vertical wind blade (53) is 120-160°, and the included angle between the outer vertical guide plate (533) and the middle vertical guide plate (532) located in the same vertical wind blade (53) is 120-160°.

6. A smoke exhaust duct cap according to claim 2, characterized in that: There are two wind turbine hubs (4), one of which is connected to the upper wheel frame (51), and the other wind turbine hub (4) is connected to the lower wheel frame (52).

7. A smoke exhaust duct cap according to claim 1, characterized in that: There are multiple support rods (7), the top of each support rod (7) is connected to the top cover (6), the bottom of each support rod (7) is connected to the mounting base (1), and the support rods (7) are evenly distributed along the circumferential direction.

8. The exhaust duct cap according to claim 1, characterized in that: The mounting base (1) is provided with a plurality of mounting and reinforcing ears (9), and each mounting and reinforcing ear (9) is formed with a locking hole (10).

9. A smoke exhaust duct cap according to claim 8, characterized in that: The number of mounting and reinforcing ears (9) is the same as that of the support rods (7), and each mounting and reinforcing ear (9) is integrally formed with each support rod (7).

10. A smoke exhaust duct cap according to any one of claims 1-9, characterized in that: The top cover (6) is a bowl-shaped structure with the opening facing downwards and the diameter gradually decreasing from bottom to top.

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